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-rw-r--r--fs/xfs/xfs_bmap.c6246
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diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
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--- /dev/null
+++ b/fs/xfs/xfs_bmap.c
@@ -0,0 +1,6246 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_itable.h"
+#include "xfs_extfree_item.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_bit.h"
+#include "xfs_rw.h"
+#include "xfs_quota.h"
+#include "xfs_trans_space.h"
+#include "xfs_buf_item.h"
+
+
+#ifdef DEBUG
+STATIC void
+xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
+#endif
+
+kmem_zone_t *xfs_bmap_free_item_zone;
+
+/*
+ * Prototypes for internal bmap routines.
+ */
+
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags); /* inode logging flags */
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_local(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags); /* inode logging flags */
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after allocating space (or doing a delayed allocation).
+ */
+STATIC int /* error */
+xfs_bmap_add_extent(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ xfs_fsblock_t *first, /* pointer to firstblock variable */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ int *logflagsp, /* inode logging flags */
+ int whichfork, /* data or attr fork */
+ int rsvd); /* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a delayed
+ * allocation to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_delay_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
+ xfs_fsblock_t *first, /* pointer to firstblock variable */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ int *logflagsp, /* inode logging flags */
+ int rsvd); /* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a delayed allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_hole_delay(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp,/* inode logging flags */
+ int rsvd); /* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_hole_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting an unwritten
+ * allocation to a real allocation or vice versa.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_unwritten_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp); /* inode logging flags */
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int /* error */
+xfs_bmap_alloc(
+ xfs_bmalloca_t *ap); /* bmap alloc argument struct */
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the extent list is already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int /* error */
+xfs_bmap_btree_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_btree_cur_t *cur, /* btree cursor */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+#ifdef DEBUG
+/*
+ * Check that the extents list for the inode ip is in the right order.
+ */
+STATIC void
+xfs_bmap_check_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork); /* data or attr fork */
+#endif
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after removing space (or undoing a delayed allocation).
+ */
+STATIC int /* error */
+xfs_bmap_del_extent(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_trans_t *tp, /* current trans pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp,/* inode logging flags */
+ int whichfork, /* data or attr fork */
+ int rsvd); /* OK to allocate reserved blocks */
+
+/*
+ * Remove the entry "free" from the free item list. Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+ xfs_bmap_free_t *flist, /* free item list header */
+ xfs_bmap_free_item_t *prev, /* previous item on list, if any */
+ xfs_bmap_free_item_t *free); /* list item to be freed */
+
+/*
+ * Remove count entries from the extents array for inode "ip", starting
+ * at index "idx". Copies the remaining items down over the deleted ones,
+ * and gives back the excess memory.
+ */
+STATIC void
+xfs_bmap_delete_exlist(
+ xfs_inode_t *ip, /* incode inode pointer */
+ xfs_extnum_t idx, /* starting delete index */
+ xfs_extnum_t count, /* count of items to delete */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int /* error */
+xfs_bmap_extents_to_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first-block-allocated */
+ xfs_bmap_free_t *flist, /* blocks freed in xaction */
+ xfs_btree_cur_t **curp, /* cursor returned to caller */
+ int wasdel, /* converting a delayed alloc */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Insert new item(s) in the extent list for inode "ip".
+ * Count new items are inserted at offset idx.
+ */
+STATIC void
+xfs_bmap_insert_exlist(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* starting index of new items */
+ xfs_extnum_t count, /* number of inserted items */
+ xfs_bmbt_irec_t *new, /* items to insert */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Convert a local file to an extents file.
+ * This code is sort of bogus, since the file data needs to get
+ * logged so it won't be lost. The bmap-level manipulations are ok, though.
+ */
+STATIC int /* error */
+xfs_bmap_local_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated in xaction */
+ xfs_extlen_t total, /* total blocks needed by transaction */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry. If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
+xfs_bmap_search_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t bno, /* block number searched for */
+ int whichfork, /* data or attr fork */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
+
+#ifdef XFS_BMAP_TRACE
+/*
+ * Add a bmap trace buffer entry. Base routine for the others.
+ */
+STATIC void
+xfs_bmap_trace_addentry(
+ int opcode, /* operation */
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(ies) */
+ xfs_extnum_t cnt, /* count of entries, 1 or 2 */
+ xfs_bmbt_rec_t *r1, /* first record */
+ xfs_bmbt_rec_t *r2, /* second record or null */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
+ */
+STATIC void
+xfs_bmap_trace_delete(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(entries) deleted */
+ xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
+ * reading in the extents list from the disk (in the btree).
+ */
+STATIC void
+xfs_bmap_trace_insert(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(entries) inserted */
+ xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
+ xfs_bmbt_irec_t *r1, /* inserted record 1 */
+ xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Add bmap trace entry after updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_post_update(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry updated */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_pre_update(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry to be updated */
+ int whichfork); /* data or attr fork */
+
+#else
+#define xfs_bmap_trace_delete(f,d,ip,i,c,w)
+#define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
+#define xfs_bmap_trace_post_update(f,d,ip,i,w)
+#define xfs_bmap_trace_pre_update(f,d,ip,i,w)
+#endif /* XFS_BMAP_TRACE */
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_filblks_t len); /* delayed extent length */
+
+#ifdef DEBUG
+/*
+ * Perform various validation checks on the values being returned
+ * from xfs_bmapi().
+ */
+STATIC void
+xfs_bmap_validate_ret(
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ xfs_bmbt_irec_t *mval,
+ int nmap,
+ int ret_nmap);
+#else
+#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
+#endif /* DEBUG */
+
+#if defined(XFS_RW_TRACE)
+STATIC void
+xfs_bunmap_trace(
+ xfs_inode_t *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ inst_t *ra);
+#else
+#define xfs_bunmap_trace(ip, bno, len, flags, ra)
+#endif /* XFS_RW_TRACE */
+
+STATIC int
+xfs_bmap_count_tree(
+ xfs_mount_t *mp,
+ xfs_trans_t *tp,
+ xfs_fsblock_t blockno,
+ int levelin,
+ int *count);
+
+STATIC int
+xfs_bmap_count_leaves(
+ xfs_bmbt_rec_t *frp,
+ int numrecs,
+ int *count);
+
+/*
+ * Bmap internal routines.
+ */
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle btree format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_btree_cur_t *cur; /* btree cursor */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* file system mount struct */
+ int stat; /* newroot status */
+
+ mp = ip->i_mount;
+ if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
+ *flags |= XFS_ILOG_DBROOT;
+ else {
+ cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+ XFS_DATA_FORK);
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.firstblock = *firstblock;
+ if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
+ goto error0;
+ ASSERT(stat == 1); /* must be at least one entry */
+ if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
+ goto error0;
+ if (stat == 0) {
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ return XFS_ERROR(ENOSPC);
+ }
+ *firstblock = cur->bc_private.b.firstblock;
+ cur->bc_private.b.allocated = 0;
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ }
+ return 0;
+error0:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ int error; /* error return value */
+
+ if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
+ return 0;
+ cur = NULL;
+ error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
+ flags, XFS_DATA_FORK);
+ if (cur) {
+ cur->bc_private.b.allocated = 0;
+ xfs_btree_del_cursor(cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_local(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_da_args_t dargs; /* args for dir/attr code */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* mount structure pointer */
+
+ if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
+ return 0;
+ if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
+ mp = ip->i_mount;
+ memset(&dargs, 0, sizeof(dargs));
+ dargs.dp = ip;
+ dargs.firstblock = firstblock;
+ dargs.flist = flist;
+ dargs.total = mp->m_dirblkfsbs;
+ dargs.whichfork = XFS_DATA_FORK;
+ dargs.trans = tp;
+ error = XFS_DIR_SHORTFORM_TO_SINGLE(mp, &dargs);
+ } else
+ error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
+ XFS_DATA_FORK);
+ return error;
+}
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after allocating space (or doing a delayed allocation).
+ */
+STATIC int /* error */
+xfs_bmap_add_extent(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ xfs_fsblock_t *first, /* pointer to firstblock variable */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ int *logflagsp, /* inode logging flags */
+ int whichfork, /* data or attr fork */
+ int rsvd) /* OK to use reserved data blocks */
+{
+ xfs_btree_cur_t *cur; /* btree cursor or null */
+ xfs_filblks_t da_new; /* new count del alloc blocks used */
+ xfs_filblks_t da_old; /* old count del alloc blocks used */
+ int error; /* error return value */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_add_extent";
+#endif
+ xfs_ifork_t *ifp; /* inode fork ptr */
+ int logflags; /* returned value */
+ xfs_extnum_t nextents; /* number of extents in file now */
+
+ XFS_STATS_INC(xs_add_exlist);
+ cur = *curp;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ ASSERT(idx <= nextents);
+ da_old = da_new = 0;
+ error = 0;
+ /*
+ * This is the first extent added to a new/empty file.
+ * Special case this one, so other routines get to assume there are
+ * already extents in the list.
+ */
+ if (nextents == 0) {
+ xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
+ NULL, whichfork);
+ xfs_bmap_insert_exlist(ip, 0, 1, new, whichfork);
+ ASSERT(cur == NULL);
+ ifp->if_lastex = 0;
+ if (!ISNULLSTARTBLOCK(new->br_startblock)) {
+ XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+ logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+ } else
+ logflags = 0;
+ }
+ /*
+ * Any kind of new delayed allocation goes here.
+ */
+ else if (ISNULLSTARTBLOCK(new->br_startblock)) {
+ if (cur)
+ ASSERT((cur->bc_private.b.flags &
+ XFS_BTCUR_BPRV_WASDEL) == 0);
+ if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
+ &logflags, rsvd)))
+ goto done;
+ }
+ /*
+ * Real allocation off the end of the file.
+ */
+ else if (idx == nextents) {
+ if (cur)
+ ASSERT((cur->bc_private.b.flags &
+ XFS_BTCUR_BPRV_WASDEL) == 0);
+ if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
+ &logflags, whichfork)))
+ goto done;
+ } else {
+ xfs_bmbt_irec_t prev; /* old extent at offset idx */
+
+ /*
+ * Get the record referred to by idx.
+ */
+ xfs_bmbt_get_all(&ifp->if_u1.if_extents[idx], &prev);
+ /*
+ * If it's a real allocation record, and the new allocation ends
+ * after the start of the referred to record, then we're filling
+ * in a delayed or unwritten allocation with a real one, or
+ * converting real back to unwritten.
+ */
+ if (!ISNULLSTARTBLOCK(new->br_startblock) &&
+ new->br_startoff + new->br_blockcount > prev.br_startoff) {
+ if (prev.br_state != XFS_EXT_UNWRITTEN &&
+ ISNULLSTARTBLOCK(prev.br_startblock)) {
+ da_old = STARTBLOCKVAL(prev.br_startblock);
+ if (cur)
+ ASSERT(cur->bc_private.b.flags &
+ XFS_BTCUR_BPRV_WASDEL);
+ if ((error = xfs_bmap_add_extent_delay_real(ip,
+ idx, &cur, new, &da_new, first, flist,
+ &logflags, rsvd)))
+ goto done;
+ } else if (new->br_state == XFS_EXT_NORM) {
+ ASSERT(new->br_state == XFS_EXT_NORM);
+ if ((error = xfs_bmap_add_extent_unwritten_real(
+ ip, idx, &cur, new, &logflags)))
+ goto done;
+ } else {
+ ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
+ if ((error = xfs_bmap_add_extent_unwritten_real(
+ ip, idx, &cur, new, &logflags)))
+ goto done;
+ }
+ ASSERT(*curp == cur || *curp == NULL);
+ }
+ /*
+ * Otherwise we're filling in a hole with an allocation.
+ */
+ else {
+ if (cur)
+ ASSERT((cur->bc_private.b.flags &
+ XFS_BTCUR_BPRV_WASDEL) == 0);
+ if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
+ new, &logflags, whichfork)))
+ goto done;
+ }
+ }
+
+ ASSERT(*curp == cur || *curp == NULL);
+ /*
+ * Convert to a btree if necessary.
+ */
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
+ flist, &cur, da_old > 0, &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+ /*
+ * Adjust for changes in reserved delayed indirect blocks.
+ * Nothing to do for disk quotas here.
+ */
+ if (da_old || da_new) {
+ xfs_filblks_t nblks;
+
+ nblks = da_new;
+ if (cur)
+ nblks += cur->bc_private.b.allocated;
+ ASSERT(nblks <= da_old);
+ if (nblks < da_old)
+ xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
+ (int)(da_old - nblks), rsvd);
+ }
+ /*
+ * Clear out the allocated field, done with it now in any case.
+ */
+ if (cur) {
+ cur->bc_private.b.allocated = 0;
+ *curp = cur;
+ }
+done:
+#ifdef DEBUG
+ if (!error)
+ xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
+#endif
+ *logflagsp = logflags;
+ return error;
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a delayed
+ * allocation to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_delay_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
+ xfs_fsblock_t *first, /* pointer to firstblock variable */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ int *logflagsp, /* inode logging flags */
+ int rsvd) /* OK to use reserved data block allocation */
+{
+ xfs_bmbt_rec_t *base; /* base of extent entry list */
+ xfs_btree_cur_t *cur; /* btree cursor */
+ int diff; /* temp value */
+ xfs_bmbt_rec_t *ep; /* extent entry for idx */
+ int error; /* error return value */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_add_extent_delay_real";
+#endif
+ int i; /* temp state */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ int state = 0;/* state bits, accessed thru macros */
+ xfs_filblks_t temp; /* value for dnew calculations */
+ xfs_filblks_t temp2; /* value for dnew calculations */
+ int tmp_rval; /* partial logging flags */
+ enum { /* bit number definitions for state */
+ LEFT_CONTIG, RIGHT_CONTIG,
+ LEFT_FILLING, RIGHT_FILLING,
+ LEFT_DELAY, RIGHT_DELAY,
+ LEFT_VALID, RIGHT_VALID
+ };
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+#define MASK(b) (1 << (b))
+#define MASK2(a,b) (MASK(a) | MASK(b))
+#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
+#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
+#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define STATE_TEST(b) (state & MASK(b))
+#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
+ ((state &= ~MASK(b)), 0))
+#define SWITCH_STATE \
+ (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ cur = *curp;
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx];
+ xfs_bmbt_get_all(ep, &PREV);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+ /*
+ * Set flags determining what part of the previous delayed allocation
+ * extent is being replaced by a real allocation.
+ */
+ STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
+ STATE_SET(RIGHT_FILLING,
+ PREV.br_startoff + PREV.br_blockcount == new_endoff);
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+ xfs_bmbt_get_all(ep - 1, &LEFT);
+ STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
+ }
+ STATE_SET(LEFT_CONTIG,
+ STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == new->br_state &&
+ LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (STATE_SET_TEST(RIGHT_VALID,
+ idx <
+ ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
+ xfs_bmbt_get_all(ep + 1, &RIGHT);
+ STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
+ }
+ STATE_SET(RIGHT_CONTIG,
+ STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount ==
+ RIGHT.br_startblock &&
+ new->br_state == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+ ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
+ MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= MAXEXTLEN));
+ error = 0;
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (SWITCH_STATE) {
+
+ case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left and right neighbors are both contiguous with new.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ ip->i_d.di_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ PREV.br_blockcount +
+ RIGHT.br_blockcount, LEFT.br_state)))
+ goto done;
+ }
+ *dnew = 0;
+ break;
+
+ case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left neighbor is contiguous, the right is not.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + PREV.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ PREV.br_blockcount, LEFT.br_state)))
+ goto done;
+ }
+ *dnew = 0;
+ break;
+
+ case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The right neighbor is contiguous, the left is not.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_startblock(ep, new->br_startblock);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount + RIGHT.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+ new->br_startblock,
+ PREV.br_blockcount +
+ RIGHT.br_blockcount, PREV.br_state)))
+ goto done;
+ }
+ *dnew = 0;
+ break;
+
+ case MASK2(LEFT_FILLING, RIGHT_FILLING):
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_startblock(ep, new->br_startblock);
+ xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ *dnew = 0;
+ break;
+
+ case MASK2(LEFT_FILLING, LEFT_CONTIG):
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is contiguous.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + new->br_blockcount);
+ xfs_bmbt_set_startoff(ep,
+ PREV.br_startoff + new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ temp = PREV.br_blockcount - new->br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep, temp);
+ ip->i_df.if_lastex = idx - 1;
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ new->br_blockcount,
+ LEFT.br_state)))
+ goto done;
+ }
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ STARTBLOCKVAL(PREV.br_startblock));
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
+ XFS_DATA_FORK);
+ *dnew = temp;
+ break;
+
+ case MASK(LEFT_FILLING):
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is not contiguous.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+ xfs_bmbt_set_startoff(ep, new_endoff);
+ temp = PREV.br_blockcount - new->br_blockcount;
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
+ XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+ error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+ first, flist, &cur, 1, &tmp_rval,
+ XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ STARTBLOCKVAL(PREV.br_startblock) -
+ (cur ? cur->bc_private.b.allocated : 0));
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx + 1];
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
+ XFS_DATA_FORK);
+ *dnew = temp;
+ break;
+
+ case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ temp = PREV.br_blockcount - new->br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ RIGHT.br_state);
+ xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount +
+ RIGHT.br_blockcount,
+ RIGHT.br_state)))
+ goto done;
+ }
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ STARTBLOCKVAL(PREV.br_startblock));
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ *dnew = temp;
+ break;
+
+ case MASK(RIGHT_FILLING):
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is not contiguous.
+ */
+ temp = PREV.br_blockcount - new->br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
+ new, NULL, XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+ error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+ first, flist, &cur, 1, &tmp_rval,
+ XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ STARTBLOCKVAL(PREV.br_startblock) -
+ (cur ? cur->bc_private.b.allocated : 0));
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx];
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+ *dnew = temp;
+ break;
+
+ case 0:
+ /*
+ * Filling in the middle part of a previous delayed allocation.
+ * Contiguity is impossible here.
+ * This case is avoided almost all the time.
+ */
+ temp = new->br_startoff - PREV.br_startoff;
+ xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep, temp);
+ r[0] = *new;
+ r[1].br_startoff = new_endoff;
+ temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ r[1].br_blockcount = temp2;
+ xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
+ XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+ error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+ first, flist, &cur, 1, &tmp_rval,
+ XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ temp = xfs_bmap_worst_indlen(ip, temp);
+ temp2 = xfs_bmap_worst_indlen(ip, temp2);
+ diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
+ (cur ? cur->bc_private.b.allocated : 0));
+ if (diff > 0 &&
+ xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -diff, rsvd)) {
+ /*
+ * Ick gross gag me with a spoon.
+ */
+ ASSERT(0); /* want to see if this ever happens! */
+ while (diff > 0) {
+ if (temp) {
+ temp--;
+ diff--;
+ if (!diff ||
+ !xfs_mod_incore_sb(ip->i_mount,
+ XFS_SBS_FDBLOCKS, -diff, rsvd))
+ break;
+ }
+ if (temp2) {
+ temp2--;
+ diff--;
+ if (!diff ||
+ !xfs_mod_incore_sb(ip->i_mount,
+ XFS_SBS_FDBLOCKS, -diff, rsvd))
+ break;
+ }
+ }
+ }
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx];
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
+ xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_startblock(ep + 2, NULLSTARTBLOCK((int)temp2));
+ xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
+ XFS_DATA_FORK);
+ *dnew = temp + temp2;
+ break;
+
+ case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK2(LEFT_FILLING, RIGHT_CONTIG):
+ case MASK2(RIGHT_FILLING, LEFT_CONTIG):
+ case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK(LEFT_CONTIG):
+ case MASK(RIGHT_CONTIG):
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+ *curp = cur;
+done:
+ *logflagsp = rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+#undef MASK
+#undef MASK2
+#undef MASK3
+#undef MASK4
+#undef STATE_SET
+#undef STATE_TEST
+#undef STATE_SET_TEST
+#undef SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting an unwritten
+ * allocation to a real allocation or vice versa.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_unwritten_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp) /* inode logging flags */
+{
+ xfs_bmbt_rec_t *base; /* base of extent entry list */
+ xfs_btree_cur_t *cur; /* btree cursor */
+ xfs_bmbt_rec_t *ep; /* extent entry for idx */
+ int error; /* error return value */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_add_extent_unwritten_real";
+#endif
+ int i; /* temp state */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_exntst_t newext; /* new extent state */
+ xfs_exntst_t oldext; /* old extent state */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ int state = 0;/* state bits, accessed thru macros */
+ enum { /* bit number definitions for state */
+ LEFT_CONTIG, RIGHT_CONTIG,
+ LEFT_FILLING, RIGHT_FILLING,
+ LEFT_DELAY, RIGHT_DELAY,
+ LEFT_VALID, RIGHT_VALID
+ };
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+#define MASK(b) (1 << (b))
+#define MASK2(a,b) (MASK(a) | MASK(b))
+#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
+#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
+#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define STATE_TEST(b) (state & MASK(b))
+#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
+ ((state &= ~MASK(b)), 0))
+#define SWITCH_STATE \
+ (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ error = 0;
+ cur = *curp;
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx];
+ xfs_bmbt_get_all(ep, &PREV);
+ newext = new->br_state;
+ oldext = (newext == XFS_EXT_UNWRITTEN) ?
+ XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
+ ASSERT(PREV.br_state == oldext);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+ /*
+ * Set flags determining what part of the previous oldext allocation
+ * extent is being replaced by a newext allocation.
+ */
+ STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
+ STATE_SET(RIGHT_FILLING,
+ PREV.br_startoff + PREV.br_blockcount == new_endoff);
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+ xfs_bmbt_get_all(ep - 1, &LEFT);
+ STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
+ }
+ STATE_SET(LEFT_CONTIG,
+ STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == newext &&
+ LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (STATE_SET_TEST(RIGHT_VALID,
+ idx <
+ ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
+ xfs_bmbt_get_all(ep + 1, &RIGHT);
+ STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
+ }
+ STATE_SET(RIGHT_CONTIG,
+ STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount ==
+ RIGHT.br_startblock &&
+ newext == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+ ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
+ MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= MAXEXTLEN));
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (SWITCH_STATE) {
+
+ case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left and right neighbors are both contiguous with new.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ ip->i_d.di_nextents -= 2;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount, LEFT.br_state)))
+ goto done;
+ }
+ break;
+
+ case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left neighbor is contiguous, the right is not.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + PREV.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+ ip->i_d.di_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + PREV.br_blockcount,
+ LEFT.br_state)))
+ goto done;
+ }
+ break;
+
+ case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The right neighbor is contiguous, the left is not.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount + RIGHT.br_blockcount);
+ xfs_bmbt_set_state(ep, newext);
+ xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
+ ip->i_d.di_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case MASK2(LEFT_FILLING, RIGHT_FILLING):
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_state(ep, newext);
+ xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case MASK2(LEFT_FILLING, LEFT_CONTIG):
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is contiguous.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1,
+ LEFT.br_blockcount + new->br_blockcount);
+ xfs_bmbt_set_startoff(ep,
+ PREV.br_startoff + new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_startblock(ep,
+ new->br_startblock + new->br_blockcount);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur,
+ PREV.br_startoff + new->br_blockcount,
+ PREV.br_startblock + new->br_blockcount,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ goto done;
+ if (xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + new->br_blockcount,
+ LEFT.br_state))
+ goto done;
+ }
+ break;
+
+ case MASK(LEFT_FILLING):
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is not contiguous.
+ */
+ xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+ ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
+ xfs_bmbt_set_startoff(ep, new_endoff);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ xfs_bmbt_set_startblock(ep,
+ new->br_startblock + new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+ xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
+ XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur,
+ PREV.br_startoff + new->br_blockcount,
+ PREV.br_startblock + new->br_blockcount,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ cur->bc_rec.b = *new;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ break;
+
+ case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount, newext);
+ xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_bmbt_increment(cur, 0, &i)))
+ goto done;
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case MASK(RIGHT_FILLING):
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is not contiguous.
+ */
+ xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+ xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
+ new, NULL, XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ break;
+
+ case 0:
+ /*
+ * Setting the middle part of a previous oldext extent to
+ * newext. Contiguity is impossible here.
+ * One extent becomes three extents.
+ */
+ xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep,
+ new->br_startoff - PREV.br_startoff);
+ xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
+ r[0] = *new;
+ r[1].br_startoff = new_endoff;
+ r[1].br_blockcount =
+ PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ r[1].br_startblock = new->br_startblock + new->br_blockcount;
+ r[1].br_state = oldext;
+ xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
+ XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx + 1;
+ ip->i_d.di_nextents += 2;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ /* new right extent - oldext */
+ if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
+ r[1].br_startblock, r[1].br_blockcount,
+ r[1].br_state)))
+ goto done;
+ /* new left extent - oldext */
+ PREV.br_blockcount =
+ new->br_startoff - PREV.br_startoff;
+ cur->bc_rec.b = PREV;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_increment(cur, 0, &i)))
+ goto done;
+ ASSERT(i == 1);
+ /* new middle extent - newext */
+ cur->bc_rec.b = *new;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ break;
+
+ case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK2(LEFT_FILLING, RIGHT_CONTIG):
+ case MASK2(RIGHT_FILLING, LEFT_CONTIG):
+ case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+ case MASK(LEFT_CONTIG):
+ case MASK(RIGHT_CONTIG):
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+ *curp = cur;
+done:
+ *logflagsp = rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+#undef MASK
+#undef MASK2
+#undef MASK3
+#undef MASK4
+#undef STATE_SET
+#undef STATE_TEST
+#undef STATE_SET_TEST
+#undef SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a delayed allocation.
+ */
+/*ARGSUSED*/
+STATIC int /* error */
+xfs_bmap_add_extent_hole_delay(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp, /* inode logging flags */
+ int rsvd) /* OK to allocate reserved blocks */
+{
+ xfs_bmbt_rec_t *base; /* base of extent entry list */
+ xfs_bmbt_rec_t *ep; /* extent list entry for idx */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_add_extent_hole_delay";
+#endif
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_filblks_t newlen=0; /* new indirect size */
+ xfs_filblks_t oldlen=0; /* old indirect size */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ int state; /* state bits, accessed thru macros */
+ xfs_filblks_t temp; /* temp for indirect calculations */
+ enum { /* bit number definitions for state */
+ LEFT_CONTIG, RIGHT_CONTIG,
+ LEFT_DELAY, RIGHT_DELAY,
+ LEFT_VALID, RIGHT_VALID
+ };
+
+#define MASK(b) (1 << (b))
+#define MASK2(a,b) (MASK(a) | MASK(b))
+#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define STATE_TEST(b) (state & MASK(b))
+#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
+ ((state &= ~MASK(b)), 0))
+#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
+
+ base = ip->i_df.if_u1.if_extents;
+ ep = &base[idx];
+ state = 0;
+ ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
+ /*
+ * Check and set flags if this segment has a left neighbor
+ */
+ if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+ xfs_bmbt_get_all(ep - 1, &left);
+ STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
+ }
+ /*
+ * Check and set flags if the current (right) segment exists.
+ * If it doesn't exist, we're converting the hole at end-of-file.
+ */
+ if (STATE_SET_TEST(RIGHT_VALID,
+ idx <
+ ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
+ xfs_bmbt_get_all(ep, &right);
+ STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
+ }
+ /*
+ * Set contiguity flags on the left and right neighbors.
+ * Don't let extents get too large, even if the pieces are contiguous.
+ */
+ STATE_SET(LEFT_CONTIG,
+ STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+ STATE_SET(RIGHT_CONTIG,
+ STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+ (!STATE_TEST(LEFT_CONTIG) ||
+ (left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= MAXEXTLEN)));
+ /*
+ * Switch out based on the contiguity flags.
+ */
+ switch (SWITCH_STATE) {
+
+ case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+ /*
+ * New allocation is contiguous with delayed allocations
+ * on the left and on the right.
+ * Merge all three into a single extent list entry.
+ */
+ temp = left.br_blockcount + new->br_blockcount +
+ right.br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1, temp);
+ oldlen = STARTBLOCKVAL(left.br_startblock) +
+ STARTBLOCKVAL(new->br_startblock) +
+ STARTBLOCKVAL(right.br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
+ xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
+ XFS_DATA_FORK);
+ xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ break;
+
+ case MASK(LEFT_CONTIG):
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ temp = left.br_blockcount + new->br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ xfs_bmbt_set_blockcount(ep - 1, temp);
+ oldlen = STARTBLOCKVAL(left.br_startblock) +
+ STARTBLOCKVAL(new->br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
+ xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
+ XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx - 1;
+ break;
+
+ case MASK(RIGHT_CONTIG):
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
+ temp = new->br_blockcount + right.br_blockcount;
+ oldlen = STARTBLOCKVAL(new->br_startblock) +
+ STARTBLOCKVAL(right.br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_allf(ep, new->br_startoff,
+ NULLSTARTBLOCK((int)newlen), temp, right.br_state);
+ xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ break;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * delayed allocation.
+ * Insert a new entry.
+ */
+ oldlen = newlen = 0;
+ xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
+ XFS_DATA_FORK);
+ xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+ ip->i_df.if_lastex = idx;
+ break;
+ }
+ if (oldlen != newlen) {
+ ASSERT(oldlen > newlen);
+ xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
+ (int)(oldlen - newlen), rsvd);
+ /*
+ * Nothing to do for disk quota accounting here.
+ */
+ }
+ *logflagsp = 0;
+ return 0;
+#undef MASK
+#undef MASK2
+#undef STATE_SET
+#undef STATE_TEST
+#undef STATE_SET_TEST
+#undef SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_hole_real(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* extent number to update/insert */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to put in extent list */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *ep; /* pointer to extent entry ins. point */
+ int error; /* error return value */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_add_extent_hole_real";
+#endif
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ int state; /* state bits, accessed thru macros */
+ enum { /* bit number definitions for state */
+ LEFT_CONTIG, RIGHT_CONTIG,
+ LEFT_DELAY, RIGHT_DELAY,
+ LEFT_VALID, RIGHT_VALID
+ };
+
+#define MASK(b) (1 << (b))
+#define MASK2(a,b) (MASK(a) | MASK(b))
+#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define STATE_TEST(b) (state & MASK(b))
+#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
+ ((state &= ~MASK(b)), 0))
+#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
+ ep = &ifp->if_u1.if_extents[idx];
+ state = 0;
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ */
+ if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+ xfs_bmbt_get_all(ep - 1, &left);
+ STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
+ }
+ /*
+ * Check and set flags if this segment has a current value.
+ * Not true if we're inserting into the "hole" at eof.
+ */
+ if (STATE_SET_TEST(RIGHT_VALID,
+ idx <
+ ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
+ xfs_bmbt_get_all(ep, &right);
+ STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
+ }
+ /*
+ * We're inserting a real allocation between "left" and "right".
+ * Set the contiguity flags. Don't let extents get too large.
+ */
+ STATE_SET(LEFT_CONTIG,
+ STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_startblock + left.br_blockcount == new->br_startblock &&
+ left.br_state == new->br_state &&
+ left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+ STATE_SET(RIGHT_CONTIG,
+ STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_startblock + new->br_blockcount ==
+ right.br_startblock &&
+ new->br_state == right.br_state &&
+ new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+ (!STATE_TEST(LEFT_CONTIG) ||
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= MAXEXTLEN));
+
+ /*
+ * Select which case we're in here, and implement it.
+ */
+ switch (SWITCH_STATE) {
+
+ case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+ /*
+ * New allocation is contiguous with real allocations on the
+ * left and on the right.
+ * Merge all three into a single extent list entry.
+ */
+ xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
+ whichfork);
+ xfs_bmbt_set_blockcount(ep - 1,
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
+ whichfork);
+ xfs_bmap_trace_delete(fname, "LC|RC", ip,
+ idx, 1, whichfork);
+ xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
+ ifp->if_lastex = idx - 1;
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
+ if (cur == NULL) {
+ *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+ return 0;
+ }
+ *logflagsp = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
+ right.br_startblock, right.br_blockcount, &i)))
+ return error;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ return error;
+ ASSERT(i == 1);
+ if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+ return error;
+ ASSERT(i == 1);
+ error = xfs_bmbt_update(cur, left.br_startoff,
+ left.br_startblock,
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount, left.br_state);
+ return error;
+
+ case MASK(LEFT_CONTIG):
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
+ xfs_bmbt_set_blockcount(ep - 1,
+ left.br_blockcount + new->br_blockcount);
+ xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
+ ifp->if_lastex = idx - 1;
+ if (cur == NULL) {
+ *logflagsp = XFS_ILOG_FEXT(whichfork);
+ return 0;
+ }
+ *logflagsp = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
+ left.br_startblock, left.br_blockcount, &i)))
+ return error;
+ ASSERT(i == 1);
+ error = xfs_bmbt_update(cur, left.br_startoff,
+ left.br_startblock,
+ left.br_blockcount + new->br_blockcount,
+ left.br_state);
+ return error;
+
+ case MASK(RIGHT_CONTIG):
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
+ xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
+ new->br_blockcount + right.br_blockcount,
+ right.br_state);
+ xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
+ ifp->if_lastex = idx;
+ if (cur == NULL) {
+ *logflagsp = XFS_ILOG_FEXT(whichfork);
+ return 0;
+ }
+ *logflagsp = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
+ right.br_startblock, right.br_blockcount, &i)))
+ return error;
+ ASSERT(i == 1);
+ error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount + right.br_blockcount,
+ right.br_state);
+ return error;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * real allocation.
+ * Insert a new entry.
+ */
+ xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
+ whichfork);
+ xfs_bmap_insert_exlist(ip, idx, 1, new, whichfork);
+ ifp->if_lastex = idx;
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
+ if (cur == NULL) {
+ *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+ return 0;
+ }
+ *logflagsp = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount, &i)))
+ return error;
+ ASSERT(i == 0);
+ cur->bc_rec.b.br_state = new->br_state;
+ if ((error = xfs_bmbt_insert(cur, &i)))
+ return error;
+ ASSERT(i == 1);
+ return 0;
+ }
+#undef MASK
+#undef MASK2
+#undef STATE_SET
+#undef STATE_TEST
+#undef STATE_SET_TEST
+#undef SWITCH_STATE
+ /* NOTREACHED */
+ ASSERT(0);
+ return 0; /* keep gcc quite */
+}
+
+#define XFS_ALLOC_GAP_UNITS 4
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int /* error */
+xfs_bmap_alloc(
+ xfs_bmalloca_t *ap) /* bmap alloc argument struct */
+{
+ xfs_fsblock_t adjust; /* adjustment to block numbers */
+ xfs_alloctype_t atype=0; /* type for allocation routines */
+ int error; /* error return value */
+ xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
+ xfs_mount_t *mp; /* mount point structure */
+ int nullfb; /* true if ap->firstblock isn't set */
+ int rt; /* true if inode is realtime */
+#ifdef __KERNEL__
+ xfs_extlen_t prod=0; /* product factor for allocators */
+ xfs_extlen_t ralen=0; /* realtime allocation length */
+#endif
+
+#define ISVALID(x,y) \
+ (rt ? \
+ (x) < mp->m_sb.sb_rblocks : \
+ XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
+ XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
+ XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
+
+ /*
+ * Set up variables.
+ */
+ mp = ap->ip->i_mount;
+ nullfb = ap->firstblock == NULLFSBLOCK;
+ rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
+ fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
+#ifdef __KERNEL__
+ if (rt) {
+ xfs_extlen_t extsz; /* file extent size for rt */
+ xfs_fileoff_t nexto; /* next file offset */
+ xfs_extlen_t orig_alen; /* original ap->alen */
+ xfs_fileoff_t orig_end; /* original off+len */
+ xfs_fileoff_t orig_off; /* original ap->off */
+ xfs_extlen_t mod_off; /* modulus calculations */
+ xfs_fileoff_t prevo; /* previous file offset */
+ xfs_rtblock_t rtx; /* realtime extent number */
+ xfs_extlen_t temp; /* temp for rt calculations */
+
+ /*
+ * Set prod to match the realtime extent size.
+ */
+ if (!(extsz = ap->ip->i_d.di_extsize))
+ extsz = mp->m_sb.sb_rextsize;
+ prod = extsz / mp->m_sb.sb_rextsize;
+ orig_off = ap->off;
+ orig_alen = ap->alen;
+ orig_end = orig_off + orig_alen;
+ /*
+ * If the file offset is unaligned vs. the extent size
+ * we need to align it. This will be possible unless
+ * the file was previously written with a kernel that didn't
+ * perform this alignment.
+ */
+ mod_off = do_mod(orig_off, extsz);
+ if (mod_off) {
+ ap->alen += mod_off;
+ ap->off -= mod_off;
+ }
+ /*
+ * Same adjustment for the end of the requested area.
+ */
+ if ((temp = (ap->alen % extsz)))
+ ap->alen += extsz - temp;
+ /*
+ * If the previous block overlaps with this proposed allocation
+ * then move the start forward without adjusting the length.
+ */
+ prevo =
+ ap->prevp->br_startoff == NULLFILEOFF ?
+ 0 :
+ (ap->prevp->br_startoff +
+ ap->prevp->br_blockcount);
+ if (ap->off != orig_off && ap->off < prevo)
+ ap->off = prevo;
+ /*
+ * If the next block overlaps with this proposed allocation
+ * then move the start back without adjusting the length,
+ * but not before offset 0.
+ * This may of course make the start overlap previous block,
+ * and if we hit the offset 0 limit then the next block
+ * can still overlap too.
+ */
+ nexto = (ap->eof || ap->gotp->br_startoff == NULLFILEOFF) ?
+ NULLFILEOFF : ap->gotp->br_startoff;
+ if (!ap->eof &&
+ ap->off + ap->alen != orig_end &&
+ ap->off + ap->alen > nexto)
+ ap->off = nexto > ap->alen ? nexto - ap->alen : 0;
+ /*
+ * If we're now overlapping the next or previous extent that
+ * means we can't fit an extsz piece in this hole. Just move
+ * the start forward to the first valid spot and set
+ * the length so we hit the end.
+ */
+ if ((ap->off != orig_off && ap->off < prevo) ||
+ (ap->off + ap->alen != orig_end &&
+ ap->off + ap->alen > nexto)) {
+ ap->off = prevo;
+ ap->alen = nexto - prevo;
+ }
+ /*
+ * If the result isn't a multiple of rtextents we need to
+ * remove blocks until it is.
+ */
+ if ((temp = (ap->alen % mp->m_sb.sb_rextsize))) {
+ /*
+ * We're not covering the original request, or
+ * we won't be able to once we fix the length.
+ */
+ if (orig_off < ap->off ||
+ orig_end > ap->off + ap->alen ||
+ ap->alen - temp < orig_alen)
+ return XFS_ERROR(EINVAL);
+ /*
+ * Try to fix it by moving the start up.
+ */
+ if (ap->off + temp <= orig_off) {
+ ap->alen -= temp;
+ ap->off += temp;
+ }
+ /*
+ * Try to fix it by moving the end in.
+ */
+ else if (ap->off + ap->alen - temp >= orig_end)
+ ap->alen -= temp;
+ /*
+ * Set the start to the minimum then trim the length.
+ */
+ else {
+ ap->alen -= orig_off - ap->off;
+ ap->off = orig_off;
+ ap->alen -= ap->alen % mp->m_sb.sb_rextsize;
+ }
+ /*
+ * Result doesn't cover the request, fail it.
+ */
+ if (orig_off < ap->off || orig_end > ap->off + ap->alen)
+ return XFS_ERROR(EINVAL);
+ }
+ ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
+ /*
+ * If the offset & length are not perfectly aligned
+ * then kill prod, it will just get us in trouble.
+ */
+ if (do_mod(ap->off, extsz) || ap->alen % extsz)
+ prod = 1;
+ /*
+ * Set ralen to be the actual requested length in rtextents.
+ */
+ ralen = ap->alen / mp->m_sb.sb_rextsize;
+ /*
+ * If the old value was close enough to MAXEXTLEN that
+ * we rounded up to it, cut it back so it's valid again.
+ * Note that if it's a really large request (bigger than
+ * MAXEXTLEN), we don't hear about that number, and can't
+ * adjust the starting point to match it.
+ */
+ if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
+ ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
+ /*
+ * If it's an allocation to an empty file at offset 0,
+ * pick an extent that will space things out in the rt area.
+ */
+ if (ap->eof && ap->off == 0) {
+ error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
+ if (error)
+ return error;
+ ap->rval = rtx * mp->m_sb.sb_rextsize;
+ } else
+ ap->rval = 0;
+ }
+#else
+ if (rt)
+ ap->rval = 0;
+#endif /* __KERNEL__ */
+ else if (nullfb)
+ ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
+ else
+ ap->rval = ap->firstblock;
+ /*
+ * If allocating at eof, and there's a previous real block,
+ * try to use it's last block as our starting point.
+ */
+ if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
+ !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
+ ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
+ ap->prevp->br_startblock)) {
+ ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
+ /*
+ * Adjust for the gap between prevp and us.
+ */
+ adjust = ap->off -
+ (ap->prevp->br_startoff + ap->prevp->br_blockcount);
+ if (adjust &&
+ ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
+ ap->rval += adjust;
+ }
+ /*
+ * If not at eof, then compare the two neighbor blocks.
+ * Figure out whether either one gives us a good starting point,
+ * and pick the better one.
+ */
+ else if (!ap->eof) {
+ xfs_fsblock_t gotbno; /* right side block number */
+ xfs_fsblock_t gotdiff=0; /* right side difference */
+ xfs_fsblock_t prevbno; /* left side block number */
+ xfs_fsblock_t prevdiff=0; /* left side difference */
+
+ /*
+ * If there's a previous (left) block, select a requested
+ * start block based on it.
+ */
+ if (ap->prevp->br_startoff != NULLFILEOFF &&
+ !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
+ (prevbno = ap->prevp->br_startblock +
+ ap->prevp->br_blockcount) &&
+ ISVALID(prevbno, ap->prevp->br_startblock)) {
+ /*
+ * Calculate gap to end of previous block.
+ */
+ adjust = prevdiff = ap->off -
+ (ap->prevp->br_startoff +
+ ap->prevp->br_blockcount);
+ /*
+ * Figure the startblock based on the previous block's
+ * end and the gap size.
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the end of the previous block.
+ */
+ if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
+ ISVALID(prevbno + prevdiff,
+ ap->prevp->br_startblock))
+ prevbno += adjust;
+ else
+ prevdiff += adjust;
+ /*
+ * If the firstblock forbids it, can't use it,
+ * must use default.
+ */
+ if (!rt && !nullfb &&
+ XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
+ prevbno = NULLFSBLOCK;
+ }
+ /*
+ * No previous block or can't follow it, just default.
+ */
+ else
+ prevbno = NULLFSBLOCK;
+ /*
+ * If there's a following (right) block, select a requested
+ * start block based on it.
+ */
+ if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
+ /*
+ * Calculate gap to start of next block.
+ */
+ adjust = gotdiff = ap->gotp->br_startoff - ap->off;
+ /*
+ * Figure the startblock based on the next block's
+ * start and the gap size.
+ */
+ gotbno = ap->gotp->br_startblock;
+ /*
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the start of the next block
+ * offset by our length.
+ */
+ if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
+ ISVALID(gotbno - gotdiff, gotbno))
+ gotbno -= adjust;
+ else if (ISVALID(gotbno - ap->alen, gotbno)) {
+ gotbno -= ap->alen;
+ gotdiff += adjust - ap->alen;
+ } else
+ gotdiff += adjust;
+ /*
+ * If the firstblock forbids it, can't use it,
+ * must use default.
+ */
+ if (!rt && !nullfb &&
+ XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
+ gotbno = NULLFSBLOCK;
+ }
+ /*
+ * No next block, just default.
+ */
+ else
+ gotbno = NULLFSBLOCK;
+ /*
+ * If both valid, pick the better one, else the only good
+ * one, else ap->rval is already set (to 0 or the inode block).
+ */
+ if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
+ ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
+ else if (prevbno != NULLFSBLOCK)
+ ap->rval = prevbno;
+ else if (gotbno != NULLFSBLOCK)
+ ap->rval = gotbno;
+ }
+ /*
+ * If allowed, use ap->rval; otherwise must use firstblock since
+ * it's in the right allocation group.
+ */
+ if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
+ ;
+ else
+ ap->rval = ap->firstblock;
+ /*
+ * Realtime allocation, done through xfs_rtallocate_extent.
+ */
+ if (rt) {
+#ifndef __KERNEL__
+ ASSERT(0);
+#else
+ xfs_rtblock_t rtb;
+
+ atype = ap->rval == 0 ?
+ XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
+ do_div(ap->rval, mp->m_sb.sb_rextsize);
+ rtb = ap->rval;
+ ap->alen = ralen;
+ if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
+ &ralen, atype, ap->wasdel, prod, &rtb)))
+ return error;
+ if (rtb == NULLFSBLOCK && prod > 1 &&
+ (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
+ ap->alen, &ralen, atype,
+ ap->wasdel, 1, &rtb)))
+ return error;
+ ap->rval = rtb;
+ if (ap->rval != NULLFSBLOCK) {
+ ap->rval *= mp->m_sb.sb_rextsize;
+ ralen *= mp->m_sb.sb_rextsize;
+ ap->alen = ralen;
+ ap->ip->i_d.di_nblocks += ralen;
+ xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+ if (ap->wasdel)
+ ap->ip->i_delayed_blks -= ralen;
+ /*
+ * Adjust the disk quota also. This was reserved
+ * earlier.
+ */
+ XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
+ ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
+ XFS_TRANS_DQ_RTBCOUNT,
+ (long) ralen);
+ } else
+ ap->alen = 0;
+#endif /* __KERNEL__ */
+ }
+ /*
+ * Normal allocation, done through xfs_alloc_vextent.
+ */
+ else {
+ xfs_agnumber_t ag;
+ xfs_alloc_arg_t args;
+ xfs_extlen_t blen;
+ xfs_extlen_t delta;
+ int isaligned;
+ xfs_extlen_t longest;
+ xfs_extlen_t need;
+ xfs_extlen_t nextminlen=0;
+ int notinit;
+ xfs_perag_t *pag;
+ xfs_agnumber_t startag;
+ int tryagain;
+
+ tryagain = isaligned = 0;
+ args.tp = ap->tp;
+ args.mp = mp;
+ args.fsbno = ap->rval;
+ args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
+ blen = 0;
+ if (nullfb) {
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.total = ap->total;
+ /*
+ * Find the longest available space.
+ * We're going to try for the whole allocation at once.
+ */
+ startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
+ notinit = 0;
+ down_read(&mp->m_peraglock);
+ while (blen < ap->alen) {
+ pag = &mp->m_perag[ag];
+ if (!pag->pagf_init &&
+ (error = xfs_alloc_pagf_init(mp, args.tp,
+ ag, XFS_ALLOC_FLAG_TRYLOCK))) {
+ up_read(&mp->m_peraglock);
+ return error;
+ }
+ /*
+ * See xfs_alloc_fix_freelist...
+ */
+ if (pag->pagf_init) {
+ need = XFS_MIN_FREELIST_PAG(pag, mp);
+ delta = need > pag->pagf_flcount ?
+ need - pag->pagf_flcount : 0;
+ longest = (pag->pagf_longest > delta) ?
+ (pag->pagf_longest - delta) :
+ (pag->pagf_flcount > 0 ||
+ pag->pagf_longest > 0);
+ if (blen < longest)
+ blen = longest;
+ } else
+ notinit = 1;
+ if (++ag == mp->m_sb.sb_agcount)
+ ag = 0;
+ if (ag == startag)
+ break;
+ }
+ up_read(&mp->m_peraglock);
+ /*
+ * Since the above loop did a BUF_TRYLOCK, it is
+ * possible that there is space for this request.
+ */
+ if (notinit || blen < ap->minlen)
+ args.minlen = ap->minlen;
+ /*
+ * If the best seen length is less than the request
+ * length, use the best as the minimum.
+ */
+ else if (blen < ap->alen)
+ args.minlen = blen;
+ /*
+ * Otherwise we've seen an extent as big as alen,
+ * use that as the minimum.
+ */
+ else
+ args.minlen = ap->alen;
+ } else if (ap->low) {
+ args.type = XFS_ALLOCTYPE_FIRST_AG;
+ args.total = args.minlen = ap->minlen;
+ } else {
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.total = ap->total;
+ args.minlen = ap->minlen;
+ }
+ if (ap->ip->i_d.di_extsize) {
+ args.prod = ap->ip->i_d.di_extsize;
+ if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
+ args.mod = (xfs_extlen_t)(args.prod - args.mod);
+ } else if (mp->m_sb.sb_blocksize >= NBPP) {
+ args.prod = 1;
+ args.mod = 0;
+ } else {
+ args.prod = NBPP >> mp->m_sb.sb_blocklog;
+ if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
+ args.mod = (xfs_extlen_t)(args.prod - args.mod);
+ }
+ /*
+ * If we are not low on available data blocks, and the
+ * underlying logical volume manager is a stripe, and
+ * the file offset is zero then try to allocate data
+ * blocks on stripe unit boundary.
+ * NOTE: ap->aeof is only set if the allocation length
+ * is >= the stripe unit and the allocation offset is
+ * at the end of file.
+ */
+ if (!ap->low && ap->aeof) {
+ if (!ap->off) {
+ args.alignment = mp->m_dalign;
+ atype = args.type;
+ isaligned = 1;
+ /*
+ * Adjust for alignment
+ */
+ if (blen > args.alignment && blen <= ap->alen)
+ args.minlen = blen - args.alignment;
+ args.minalignslop = 0;
+ } else {
+ /*
+ * First try an exact bno allocation.
+ * If it fails then do a near or start bno
+ * allocation with alignment turned on.
+ */
+ atype = args.type;
+ tryagain = 1;
+ args.type = XFS_ALLOCTYPE_THIS_BNO;
+ args.alignment = 1;
+ /*
+ * Compute the minlen+alignment for the
+ * next case. Set slop so that the value
+ * of minlen+alignment+slop doesn't go up
+ * between the calls.
+ */
+ if (blen > mp->m_dalign && blen <= ap->alen)
+ nextminlen = blen - mp->m_dalign;
+ else
+ nextminlen = args.minlen;
+ if (nextminlen + mp->m_dalign > args.minlen + 1)
+ args.minalignslop =
+ nextminlen + mp->m_dalign -
+ args.minlen - 1;
+ else
+ args.minalignslop = 0;
+ }
+ } else {
+ args.alignment = 1;
+ args.minalignslop = 0;
+ }
+ args.minleft = ap->minleft;
+ args.wasdel = ap->wasdel;
+ args.isfl = 0;
+ args.userdata = ap->userdata;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ if (tryagain && args.fsbno == NULLFSBLOCK) {
+ /*
+ * Exact allocation failed. Now try with alignment
+ * turned on.
+ */
+ args.type = atype;
+ args.fsbno = ap->rval;
+ args.alignment = mp->m_dalign;
+ args.minlen = nextminlen;
+ args.minalignslop = 0;
+ isaligned = 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (isaligned && args.fsbno == NULLFSBLOCK) {
+ /*
+ * allocation failed, so turn off alignment and
+ * try again.
+ */
+ args.type = atype;
+ args.fsbno = ap->rval;
+ args.alignment = 0;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (args.fsbno == NULLFSBLOCK && nullfb &&
+ args.minlen > ap->minlen) {
+ args.minlen = ap->minlen;
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = ap->rval;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (args.fsbno == NULLFSBLOCK && nullfb) {
+ args.fsbno = 0;
+ args.type = XFS_ALLOCTYPE_FIRST_AG;
+ args.total = ap->minlen;
+ args.minleft = 0;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ ap->low = 1;
+ }
+ if (args.fsbno != NULLFSBLOCK) {
+ ap->firstblock = ap->rval = args.fsbno;
+ ASSERT(nullfb || fb_agno == args.agno ||
+ (ap->low && fb_agno < args.agno));
+ ap->alen = args.len;
+ ap->ip->i_d.di_nblocks += args.len;
+ xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+ if (ap->wasdel)
+ ap->ip->i_delayed_blks -= args.len;
+ /*
+ * Adjust the disk quota also. This was reserved
+ * earlier.
+ */
+ XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
+ ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
+ XFS_TRANS_DQ_BCOUNT,
+ (long) args.len);
+ } else {
+ ap->rval = NULLFSBLOCK;
+ ap->alen = 0;
+ }
+ }
+ return 0;
+#undef ISVALID
+}
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the extent list is already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int /* error */
+xfs_bmap_btree_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_btree_cur_t *cur, /* btree cursor */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ /* REFERENCED */
+ xfs_bmbt_block_t *cblock;/* child btree block */
+ xfs_fsblock_t cbno; /* child block number */
+ xfs_buf_t *cbp; /* child block's buffer */
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork data */
+ xfs_mount_t *mp; /* mount point structure */
+ xfs_bmbt_ptr_t *pp; /* ptr to block address */
+ xfs_bmbt_block_t *rblock;/* root btree block */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+ rblock = ifp->if_broot;
+ ASSERT(INT_GET(rblock->bb_level, ARCH_CONVERT) == 1);
+ ASSERT(INT_GET(rblock->bb_numrecs, ARCH_CONVERT) == 1);
+ ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
+ mp = ip->i_mount;
+ pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
+ *logflagsp = 0;
+#ifdef DEBUG
+ if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), 1)))
+ return error;
+#endif
+ cbno = INT_GET(*pp, ARCH_CONVERT);
+ if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
+ if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
+ return error;
+ xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
+ ip->i_d.di_nblocks--;
+ XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
+ xfs_trans_binval(tp, cbp);
+ if (cur->bc_bufs[0] == cbp)
+ cur->bc_bufs[0] = NULL;
+ xfs_iroot_realloc(ip, -1, whichfork);
+ ASSERT(ifp->if_broot == NULL);
+ ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+ *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+ return 0;
+}
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after removing space (or undoing a delayed allocation).
+ */
+STATIC int /* error */
+xfs_bmap_del_extent(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_trans_t *tp, /* current transaction pointer */
+ xfs_extnum_t idx, /* extent number to update/delete */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *del, /* data to remove from extent list */
+ int *logflagsp, /* inode logging flags */
+ int whichfork, /* data or attr fork */
+ int rsvd) /* OK to allocate reserved blocks */
+{
+ xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
+ xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
+ xfs_fsblock_t del_endblock=0; /* first block past del */
+ xfs_fileoff_t del_endoff; /* first offset past del */
+ int delay; /* current block is delayed allocated */
+ int do_fx; /* free extent at end of routine */
+ xfs_bmbt_rec_t *ep; /* current extent entry pointer */
+ int error; /* error return value */
+ int flags; /* inode logging flags */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_del_extent";
+#endif
+ xfs_bmbt_irec_t got; /* current extent entry */
+ xfs_fileoff_t got_endoff; /* first offset past got */
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t nblks; /* quota/sb block count */
+ xfs_bmbt_irec_t new; /* new record to be inserted */
+ /* REFERENCED */
+ xfs_extnum_t nextents; /* number of extents in list */
+ uint qfield; /* quota field to update */
+ xfs_filblks_t temp; /* for indirect length calculations */
+ xfs_filblks_t temp2; /* for indirect length calculations */
+
+ XFS_STATS_INC(xs_del_exlist);
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ ASSERT(idx >= 0 && idx < nextents);
+ ASSERT(del->br_blockcount > 0);
+ ep = &ifp->if_u1.if_extents[idx];
+ xfs_bmbt_get_all(ep, &got);
+ ASSERT(got.br_startoff <= del->br_startoff);
+ del_endoff = del->br_startoff + del->br_blockcount;
+ got_endoff = got.br_startoff + got.br_blockcount;
+ ASSERT(got_endoff >= del_endoff);
+ delay = ISNULLSTARTBLOCK(got.br_startblock);
+ ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
+ flags = 0;
+ qfield = 0;
+ error = 0;
+ /*
+ * If deleting a real allocation, must free up the disk space.
+ */
+ if (!delay) {
+ flags = XFS_ILOG_CORE;
+ /*
+ * Realtime allocation. Free it and record di_nblocks update.
+ */
+ if (whichfork == XFS_DATA_FORK &&
+ (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+ xfs_fsblock_t bno;
+ xfs_filblks_t len;
+
+ ASSERT(do_mod(del->br_blockcount,
+ mp->m_sb.sb_rextsize) == 0);
+ ASSERT(do_mod(del->br_startblock,
+ mp->m_sb.sb_rextsize) == 0);
+ bno = del->br_startblock;
+ len = del->br_blockcount;
+ do_div(bno, mp->m_sb.sb_rextsize);
+ do_div(len, mp->m_sb.sb_rextsize);
+ if ((error = xfs_rtfree_extent(ip->i_transp, bno,
+ (xfs_extlen_t)len)))
+ goto done;
+ do_fx = 0;
+ nblks = len * mp->m_sb.sb_rextsize;
+ qfield = XFS_TRANS_DQ_RTBCOUNT;
+ }
+ /*
+ * Ordinary allocation.
+ */
+ else {
+ do_fx = 1;
+ nblks = del->br_blockcount;
+ qfield = XFS_TRANS_DQ_BCOUNT;
+ }
+ /*
+ * Set up del_endblock and cur for later.
+ */
+ del_endblock = del->br_startblock + del->br_blockcount;
+ if (cur) {
+ if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
+ got.br_startblock, got.br_blockcount,
+ &i)))
+ goto done;
+ ASSERT(i == 1);
+ }
+ da_old = da_new = 0;
+ } else {
+ da_old = STARTBLOCKVAL(got.br_startblock);
+ da_new = 0;
+ nblks = 0;
+ do_fx = 0;
+ }
+ /*
+ * Set flag value to use in switch statement.
+ * Left-contig is 2, right-contig is 1.
+ */
+ switch (((got.br_startoff == del->br_startoff) << 1) |
+ (got_endoff == del_endoff)) {
+ case 3:
+ /*
+ * Matches the whole extent. Delete the entry.
+ */
+ xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
+ xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
+ ifp->if_lastex = idx;
+ if (delay)
+ break;
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
+ flags |= XFS_ILOG_CORE;
+ if (!cur) {
+ flags |= XFS_ILOG_FEXT(whichfork);
+ break;
+ }
+ if ((error = xfs_bmbt_delete(cur, &i)))
+ goto done;
+ ASSERT(i == 1);
+ break;
+
+ case 2:
+ /*
+ * Deleting the first part of the extent.
+ */
+ xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
+ xfs_bmbt_set_startoff(ep, del_endoff);
+ temp = got.br_blockcount - del->br_blockcount;
+ xfs_bmbt_set_blockcount(ep, temp);
+ ifp->if_lastex = idx;
+ if (delay) {
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ da_old);
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "2", ip, idx,
+ whichfork);
+ da_new = temp;
+ break;
+ }
+ xfs_bmbt_set_startblock(ep, del_endblock);
+ xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
+ if (!cur) {
+ flags |= XFS_ILOG_FEXT(whichfork);
+ break;
+ }
+ if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
+ got.br_blockcount - del->br_blockcount,
+ got.br_state)))
+ goto done;
+ break;
+
+ case 1:
+ /*
+ * Deleting the last part of the extent.
+ */
+ temp = got.br_blockcount - del->br_blockcount;
+ xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
+ xfs_bmbt_set_blockcount(ep, temp);
+ ifp->if_lastex = idx;
+ if (delay) {
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ da_old);
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ xfs_bmap_trace_post_update(fname, "1", ip, idx,
+ whichfork);
+ da_new = temp;
+ break;
+ }
+ xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
+ if (!cur) {
+ flags |= XFS_ILOG_FEXT(whichfork);
+ break;
+ }
+ if ((error = xfs_bmbt_update(cur, got.br_startoff,
+ got.br_startblock,
+ got.br_blockcount - del->br_blockcount,
+ got.br_state)))
+ goto done;
+ break;
+
+ case 0:
+ /*
+ * Deleting the middle of the extent.
+ */
+ temp = del->br_startoff - got.br_startoff;
+ xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
+ xfs_bmbt_set_blockcount(ep, temp);
+ new.br_startoff = del_endoff;
+ temp2 = got_endoff - del_endoff;
+ new.br_blockcount = temp2;
+ new.br_state = got.br_state;
+ if (!delay) {
+ new.br_startblock = del_endblock;
+ flags |= XFS_ILOG_CORE;
+ if (cur) {
+ if ((error = xfs_bmbt_update(cur,
+ got.br_startoff,
+ got.br_startblock, temp,
+ got.br_state)))
+ goto done;
+ if ((error = xfs_bmbt_increment(cur, 0, &i)))
+ goto done;
+ cur->bc_rec.b = new;
+ error = xfs_bmbt_insert(cur, &i);
+ if (error && error != ENOSPC)
+ goto done;
+ /*
+ * If get no-space back from btree insert,
+ * it tried a split, and we have a zero
+ * block reservation.
+ * Fix up our state and return the error.
+ */
+ if (error == ENOSPC) {
+ /*
+ * Reset the cursor, don't trust
+ * it after any insert operation.
+ */
+ if ((error = xfs_bmbt_lookup_eq(cur,
+ got.br_startoff,
+ got.br_startblock,
+ temp, &i)))
+ goto done;
+ ASSERT(i == 1);
+ /*
+ * Update the btree record back
+ * to the original value.
+ */
+ if ((error = xfs_bmbt_update(cur,
+ got.br_startoff,
+ got.br_startblock,
+ got.br_blockcount,
+ got.br_state)))
+ goto done;
+ /*
+ * Reset the extent record back
+ * to the original value.
+ */
+ xfs_bmbt_set_blockcount(ep,
+ got.br_blockcount);
+ flags = 0;
+ error = XFS_ERROR(ENOSPC);
+ goto done;
+ }
+ ASSERT(i == 1);
+ } else
+ flags |= XFS_ILOG_FEXT(whichfork);
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
+ } else {
+ ASSERT(whichfork == XFS_DATA_FORK);
+ temp = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+ temp2 = xfs_bmap_worst_indlen(ip, temp2);
+ new.br_startblock = NULLSTARTBLOCK((int)temp2);
+ da_new = temp + temp2;
+ while (da_new > da_old) {
+ if (temp) {
+ temp--;
+ da_new--;
+ xfs_bmbt_set_startblock(ep,
+ NULLSTARTBLOCK((int)temp));
+ }
+ if (da_new == da_old)
+ break;
+ if (temp2) {
+ temp2--;
+ da_new--;
+ new.br_startblock =
+ NULLSTARTBLOCK((int)temp2);
+ }
+ }
+ }
+ xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
+ xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
+ whichfork);
+ xfs_bmap_insert_exlist(ip, idx + 1, 1, &new, whichfork);
+ ifp->if_lastex = idx + 1;
+ break;
+ }
+ /*
+ * If we need to, add to list of extents to delete.
+ */
+ if (do_fx)
+ xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
+ mp);
+ /*
+ * Adjust inode # blocks in the file.
+ */
+ if (nblks)
+ ip->i_d.di_nblocks -= nblks;
+ /*
+ * Adjust quota data.
+ */
+ if (qfield)
+ XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
+
+ /*
+ * Account for change in delayed indirect blocks.
+ * Nothing to do for disk quota accounting here.
+ */
+ ASSERT(da_old >= da_new);
+ if (da_old > da_new)
+ xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int)(da_old - da_new),
+ rsvd);
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+/*
+ * Remove the entry "free" from the free item list. Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+ xfs_bmap_free_t *flist, /* free item list header */
+ xfs_bmap_free_item_t *prev, /* previous item on list, if any */
+ xfs_bmap_free_item_t *free) /* list item to be freed */
+{
+ if (prev)
+ prev->xbfi_next = free->xbfi_next;
+ else
+ flist->xbf_first = free->xbfi_next;
+ flist->xbf_count--;
+ kmem_zone_free(xfs_bmap_free_item_zone, free);
+}
+
+/*
+ * Remove count entries from the extents array for inode "ip", starting
+ * at index "idx". Copies the remaining items down over the deleted ones,
+ * and gives back the excess memory.
+ */
+STATIC void
+xfs_bmap_delete_exlist(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* starting delete index */
+ xfs_extnum_t count, /* count of items to delete */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* base of extent list */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t nextents; /* number of extents in list after */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ base = ifp->if_u1.if_extents;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - count;
+ memmove(&base[idx], &base[idx + count],
+ (nextents - idx) * sizeof(*base));
+ xfs_iext_realloc(ip, -count, whichfork);
+}
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int /* error */
+xfs_bmap_extents_to_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first-block-allocated */
+ xfs_bmap_free_t *flist, /* blocks freed in xaction */
+ xfs_btree_cur_t **curp, /* cursor returned to caller */
+ int wasdel, /* converting a delayed alloc */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_block_t *ablock; /* allocated (child) bt block */
+ xfs_buf_t *abp; /* buffer for ablock */
+ xfs_alloc_arg_t args; /* allocation arguments */
+ xfs_bmbt_rec_t *arp; /* child record pointer */
+ xfs_bmbt_block_t *block; /* btree root block */
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ xfs_bmbt_rec_t *ep; /* extent list pointer */
+ int error; /* error return value */
+ xfs_extnum_t i, cnt; /* extent list index */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_key_t *kp; /* root block key pointer */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_extnum_t nextents; /* extent list size */
+ xfs_bmbt_ptr_t *pp; /* root block address pointer */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ /*
+ * Make space in the inode incore.
+ */
+ xfs_iroot_realloc(ip, 1, whichfork);
+ ifp->if_flags |= XFS_IFBROOT;
+ /*
+ * Fill in the root.
+ */
+ block = ifp->if_broot;
+ INT_SET(block->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
+ INT_SET(block->bb_level, ARCH_CONVERT, 1);
+ INT_SET(block->bb_numrecs, ARCH_CONVERT, 1);
+ INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
+ INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
+ /*
+ * Need a cursor. Can't allocate until bb_level is filled in.
+ */
+ mp = ip->i_mount;
+ cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+ whichfork);
+ cur->bc_private.b.firstblock = *firstblock;
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
+ /*
+ * Convert to a btree with two levels, one record in root.
+ */
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
+ args.tp = tp;
+ args.mp = mp;
+ if (*firstblock == NULLFSBLOCK) {
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
+ } else if (flist->xbf_low) {
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = *firstblock;
+ } else {
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.fsbno = *firstblock;
+ }
+ args.minlen = args.maxlen = args.prod = 1;
+ args.total = args.minleft = args.alignment = args.mod = args.isfl =
+ args.minalignslop = 0;
+ args.wasdel = wasdel;
+ *logflagsp = 0;
+ if ((error = xfs_alloc_vextent(&args))) {
+ xfs_iroot_realloc(ip, -1, whichfork);
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+ }
+ /*
+ * Allocation can't fail, the space was reserved.
+ */
+ ASSERT(args.fsbno != NULLFSBLOCK);
+ ASSERT(*firstblock == NULLFSBLOCK ||
+ args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
+ (flist->xbf_low &&
+ args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
+ *firstblock = cur->bc_private.b.firstblock = args.fsbno;
+ cur->bc_private.b.allocated++;
+ ip->i_d.di_nblocks++;
+ XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
+ abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
+ /*
+ * Fill in the child block.
+ */
+ ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
+ INT_SET(ablock->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
+ ablock->bb_level = 0;
+ INT_SET(ablock->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
+ INT_SET(ablock->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
+ arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ for (ep = ifp->if_u1.if_extents, cnt = i = 0; i < nextents; i++, ep++) {
+ if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
+ arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
+ arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
+ arp++; cnt++;
+ }
+ }
+ INT_SET(ablock->bb_numrecs, ARCH_CONVERT, cnt);
+ ASSERT(INT_GET(ablock->bb_numrecs, ARCH_CONVERT) == XFS_IFORK_NEXTENTS(ip, whichfork));
+ /*
+ * Fill in the root key and pointer.
+ */
+ kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
+ arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
+ INT_SET(kp->br_startoff, ARCH_CONVERT, xfs_bmbt_disk_get_startoff(arp));
+ pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
+ INT_SET(*pp, ARCH_CONVERT, args.fsbno);
+ /*
+ * Do all this logging at the end so that
+ * the root is at the right level.
+ */
+ xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
+ xfs_bmbt_log_recs(cur, abp, 1, INT_GET(ablock->bb_numrecs, ARCH_CONVERT));
+ ASSERT(*curp == NULL);
+ *curp = cur;
+ *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
+ return 0;
+}
+
+/*
+ * Insert new item(s) in the extent list for inode "ip".
+ * Count new items are inserted at offset idx.
+ */
+STATIC void
+xfs_bmap_insert_exlist(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* starting index of new items */
+ xfs_extnum_t count, /* number of inserted items */
+ xfs_bmbt_irec_t *new, /* items to insert */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* extent list base */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t nextents; /* extent list size */
+ xfs_extnum_t to; /* extent list index */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ xfs_iext_realloc(ip, count, whichfork);
+ base = ifp->if_u1.if_extents;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ memmove(&base[idx + count], &base[idx],
+ (nextents - (idx + count)) * sizeof(*base));
+ for (to = idx; to < idx + count; to++, new++)
+ xfs_bmbt_set_all(&base[to], new);
+}
+
+/*
+ * Convert a local file to an extents file.
+ * This code is out of bounds for data forks of regular files,
+ * since the file data needs to get logged so things will stay consistent.
+ * (The bmap-level manipulations are ok, though).
+ */
+STATIC int /* error */
+xfs_bmap_local_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated in xaction */
+ xfs_extlen_t total, /* total blocks needed by transaction */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ int error; /* error return value */
+ int flags; /* logging flags returned */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_local_to_extents";
+#endif
+ xfs_ifork_t *ifp; /* inode fork pointer */
+
+ /*
+ * We don't want to deal with the case of keeping inode data inline yet.
+ * So sending the data fork of a regular inode is invalid.
+ */
+ ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
+ whichfork == XFS_DATA_FORK));
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+ flags = 0;
+ error = 0;
+ if (ifp->if_bytes) {
+ xfs_alloc_arg_t args; /* allocation arguments */
+ xfs_buf_t *bp; /* buffer for extent list block */
+ xfs_bmbt_rec_t *ep; /* extent list pointer */
+
+ args.tp = tp;
+ args.mp = ip->i_mount;
+ ASSERT(ifp->if_flags & XFS_IFINLINE);
+ /*
+ * Allocate a block. We know we need only one, since the
+ * file currently fits in an inode.
+ */
+ if (*firstblock == NULLFSBLOCK) {
+ args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ } else {
+ args.fsbno = *firstblock;
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ }
+ args.total = total;
+ args.mod = args.minleft = args.alignment = args.wasdel =
+ args.isfl = args.minalignslop = 0;
+ args.minlen = args.maxlen = args.prod = 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ goto done;
+ /*
+ * Can't fail, the space was reserved.
+ */
+ ASSERT(args.fsbno != NULLFSBLOCK);
+ ASSERT(args.len == 1);
+ *firstblock = args.fsbno;
+ bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
+ memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
+ ifp->if_bytes);
+ xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
+ xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+ xfs_iext_realloc(ip, 1, whichfork);
+ ep = ifp->if_u1.if_extents;
+ xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
+ xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
+ XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+ ip->i_d.di_nblocks = 1;
+ XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
+ XFS_TRANS_DQ_BCOUNT, 1L);
+ flags |= XFS_ILOG_FEXT(whichfork);
+ } else
+ ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
+ ifp->if_flags &= ~XFS_IFINLINE;
+ ifp->if_flags |= XFS_IFEXTENTS;
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+ flags |= XFS_ILOG_CORE;
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+xfs_bmbt_rec_t * /* pointer to found extent entry */
+xfs_bmap_do_search_extents(
+ xfs_bmbt_rec_t *base, /* base of extent list */
+ xfs_extnum_t lastx, /* last extent index used */
+ xfs_extnum_t nextents, /* extent list size */
+ xfs_fileoff_t bno, /* block number searched for */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
+{
+ xfs_bmbt_rec_t *ep; /* extent list entry pointer */
+ xfs_bmbt_irec_t got; /* extent list entry, decoded */
+ int high; /* high index of binary search */
+ int low; /* low index of binary search */
+
+ /*
+ * Initialize the extent entry structure to catch access to
+ * uninitialized br_startblock field.
+ */
+ got.br_startoff = 0xffa5a5a5a5a5a5a5LL;
+ got.br_blockcount = 0xa55a5a5a5a5a5a5aLL;
+ got.br_state = XFS_EXT_INVALID;
+
+#if XFS_BIG_BLKNOS
+ got.br_startblock = 0xffffa5a5a5a5a5a5LL;
+#else
+ got.br_startblock = 0xffffa5a5;
+#endif
+
+ if (lastx != NULLEXTNUM && lastx < nextents)
+ ep = base + lastx;
+ else
+ ep = NULL;
+ prevp->br_startoff = NULLFILEOFF;
+ if (ep && bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep)) &&
+ bno < got.br_startoff +
+ (got.br_blockcount = xfs_bmbt_get_blockcount(ep)))
+ *eofp = 0;
+ else if (ep && lastx < nextents - 1 &&
+ bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep + 1)) &&
+ bno < got.br_startoff +
+ (got.br_blockcount = xfs_bmbt_get_blockcount(ep + 1))) {
+ lastx++;
+ ep++;
+ *eofp = 0;
+ } else if (nextents == 0)
+ *eofp = 1;
+ else if (bno == 0 &&
+ (got.br_startoff = xfs_bmbt_get_startoff(base)) == 0) {
+ ep = base;
+ lastx = 0;
+ got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+ *eofp = 0;
+ } else {
+ /* binary search the extents array */
+ low = 0;
+ high = nextents - 1;
+ while (low <= high) {
+ XFS_STATS_INC(xs_cmp_exlist);
+ lastx = (low + high) >> 1;
+ ep = base + lastx;
+ got.br_startoff = xfs_bmbt_get_startoff(ep);
+ got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+ if (bno < got.br_startoff)
+ high = lastx - 1;
+ else if (bno >= got.br_startoff + got.br_blockcount)
+ low = lastx + 1;
+ else {
+ got.br_startblock = xfs_bmbt_get_startblock(ep);
+ got.br_state = xfs_bmbt_get_state(ep);
+ *eofp = 0;
+ *lastxp = lastx;
+ *gotp = got;
+ return ep;
+ }
+ }
+ if (bno >= got.br_startoff + got.br_blockcount) {
+ lastx++;
+ if (lastx == nextents) {
+ *eofp = 1;
+ got.br_startblock = xfs_bmbt_get_startblock(ep);
+ got.br_state = xfs_bmbt_get_state(ep);
+ *prevp = got;
+ ep = NULL;
+ } else {
+ *eofp = 0;
+ xfs_bmbt_get_all(ep, prevp);
+ ep++;
+ got.br_startoff = xfs_bmbt_get_startoff(ep);
+ got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+ }
+ } else {
+ *eofp = 0;
+ if (ep > base)
+ xfs_bmbt_get_all(ep - 1, prevp);
+ }
+ }
+ if (ep) {
+ got.br_startblock = xfs_bmbt_get_startblock(ep);
+ got.br_state = xfs_bmbt_get_state(ep);
+ }
+ *lastxp = lastx;
+ *gotp = got;
+ return ep;
+}
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry. If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
+xfs_bmap_search_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t bno, /* block number searched for */
+ int whichfork, /* data or attr fork */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_rec_t *base; /* base of extent list */
+ xfs_extnum_t lastx; /* last extent index used */
+ xfs_extnum_t nextents; /* extent list size */
+ xfs_bmbt_rec_t *ep; /* extent list entry pointer */
+ int rt; /* realtime flag */
+
+ XFS_STATS_INC(xs_look_exlist);
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ lastx = ifp->if_lastex;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ base = &ifp->if_u1.if_extents[0];
+
+ ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp,
+ lastxp, gotp, prevp);
+ rt = ip->i_d.di_flags & XFS_DIFLAG_REALTIME;
+ if(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM)) {
+ cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
+ "start_block : %llx start_off : %llx blkcnt : %llx "
+ "extent-state : %x \n",
+ (ip->i_mount)->m_fsname,(long long)ip->i_ino,
+ gotp->br_startblock, gotp->br_startoff,
+ gotp->br_blockcount,gotp->br_state);
+ }
+ return ep;
+}
+
+
+#ifdef XFS_BMAP_TRACE
+ktrace_t *xfs_bmap_trace_buf;
+
+/*
+ * Add a bmap trace buffer entry. Base routine for the others.
+ */
+STATIC void
+xfs_bmap_trace_addentry(
+ int opcode, /* operation */
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(ies) */
+ xfs_extnum_t cnt, /* count of entries, 1 or 2 */
+ xfs_bmbt_rec_t *r1, /* first record */
+ xfs_bmbt_rec_t *r2, /* second record or null */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t tr2;
+
+ ASSERT(cnt == 1 || cnt == 2);
+ ASSERT(r1 != NULL);
+ if (cnt == 1) {
+ ASSERT(r2 == NULL);
+ r2 = &tr2;
+ memset(&tr2, 0, sizeof(tr2));
+ } else
+ ASSERT(r2 != NULL);
+ ktrace_enter(xfs_bmap_trace_buf,
+ (void *)(__psint_t)(opcode | (whichfork << 16)),
+ (void *)fname, (void *)desc, (void *)ip,
+ (void *)(__psint_t)idx,
+ (void *)(__psint_t)cnt,
+ (void *)(__psunsigned_t)(ip->i_ino >> 32),
+ (void *)(__psunsigned_t)(unsigned)ip->i_ino,
+ (void *)(__psunsigned_t)(r1->l0 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r1->l0),
+ (void *)(__psunsigned_t)(r1->l1 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r1->l1),
+ (void *)(__psunsigned_t)(r2->l0 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r2->l0),
+ (void *)(__psunsigned_t)(r2->l1 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r2->l1)
+ );
+ ASSERT(ip->i_xtrace);
+ ktrace_enter(ip->i_xtrace,
+ (void *)(__psint_t)(opcode | (whichfork << 16)),
+ (void *)fname, (void *)desc, (void *)ip,
+ (void *)(__psint_t)idx,
+ (void *)(__psint_t)cnt,
+ (void *)(__psunsigned_t)(ip->i_ino >> 32),
+ (void *)(__psunsigned_t)(unsigned)ip->i_ino,
+ (void *)(__psunsigned_t)(r1->l0 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r1->l0),
+ (void *)(__psunsigned_t)(r1->l1 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r1->l1),
+ (void *)(__psunsigned_t)(r2->l0 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r2->l0),
+ (void *)(__psunsigned_t)(r2->l1 >> 32),
+ (void *)(__psunsigned_t)(unsigned)(r2->l1)
+ );
+}
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
+ */
+STATIC void
+xfs_bmap_trace_delete(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(entries) deleted */
+ xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
+ int whichfork) /* data or attr fork */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
+ cnt, &ifp->if_u1.if_extents[idx],
+ cnt == 2 ? &ifp->if_u1.if_extents[idx + 1] : NULL,
+ whichfork);
+}
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
+ * reading in the extents list from the disk (in the btree).
+ */
+STATIC void
+xfs_bmap_trace_insert(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry(entries) inserted */
+ xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
+ xfs_bmbt_irec_t *r1, /* inserted record 1 */
+ xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t tr1; /* compressed record 1 */
+ xfs_bmbt_rec_t tr2; /* compressed record 2 if needed */
+
+ xfs_bmbt_set_all(&tr1, r1);
+ if (cnt == 2) {
+ ASSERT(r2 != NULL);
+ xfs_bmbt_set_all(&tr2, r2);
+ } else {
+ ASSERT(cnt == 1);
+ ASSERT(r2 == NULL);
+ }
+ xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
+ cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
+}
+
+/*
+ * Add bmap trace entry after updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_post_update(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry updated */
+ int whichfork) /* data or attr fork */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
+ 1, &ifp->if_u1.if_extents[idx], NULL, whichfork);
+}
+
+/*
+ * Add bmap trace entry prior to updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_pre_update(
+ char *fname, /* function name */
+ char *desc, /* operation description */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t idx, /* index of entry to be updated */
+ int whichfork) /* data or attr fork */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
+ &ifp->if_u1.if_extents[idx], NULL, whichfork);
+}
+#endif /* XFS_BMAP_TRACE */
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_filblks_t len) /* delayed extent length */
+{
+ int level; /* btree level number */
+ int maxrecs; /* maximum record count at this level */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t rval; /* return value */
+
+ mp = ip->i_mount;
+ maxrecs = mp->m_bmap_dmxr[0];
+ for (level = 0, rval = 0;
+ level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
+ level++) {
+ len += maxrecs - 1;
+ do_div(len, maxrecs);
+ rval += len;
+ if (len == 1)
+ return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
+ level - 1;
+ if (level == 0)
+ maxrecs = mp->m_bmap_dmxr[1];
+ }
+ return rval;
+}
+
+#if defined(XFS_RW_TRACE)
+STATIC void
+xfs_bunmap_trace(
+ xfs_inode_t *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ inst_t *ra)
+{
+ if (ip->i_rwtrace == NULL)
+ return;
+ ktrace_enter(ip->i_rwtrace,
+ (void *)(__psint_t)XFS_BUNMAPI,
+ (void *)ip,
+ (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
+ (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
+ (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
+ (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
+ (void *)(__psint_t)len,
+ (void *)(__psint_t)flags,
+ (void *)(unsigned long)current_cpu(),
+ (void *)ra,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0);
+}
+#endif
+
+/*
+ * Convert inode from non-attributed to attributed.
+ * Must not be in a transaction, ip must not be locked.
+ */
+int /* error code */
+xfs_bmap_add_attrfork(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int rsvd) /* OK to allocated reserved blocks in trans */
+{
+ int blks; /* space reservation */
+ int committed; /* xaction was committed */
+ int error; /* error return value */
+ xfs_fsblock_t firstblock; /* 1st block/ag allocated */
+ xfs_bmap_free_t flist; /* freed extent list */
+ int logflags; /* logging flags */
+ xfs_mount_t *mp; /* mount structure */
+ unsigned long s; /* spinlock spl value */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ ASSERT(ip->i_df.if_ext_max ==
+ XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+ if (XFS_IFORK_Q(ip))
+ return 0;
+ mp = ip->i_mount;
+ ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
+ tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
+ blks = XFS_ADDAFORK_SPACE_RES(mp);
+ if (rsvd)
+ tp->t_flags |= XFS_TRANS_RESERVE;
+ if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
+ goto error0;
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
+ XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
+ XFS_QMOPT_RES_REGBLKS);
+ if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
+ return error;
+ }
+ if (XFS_IFORK_Q(ip))
+ goto error1;
+ if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
+ /*
+ * For inodes coming from pre-6.2 filesystems.
+ */
+ ASSERT(ip->i_d.di_aformat == 0);
+ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+ }
+ ASSERT(ip->i_d.di_anextents == 0);
+ VN_HOLD(XFS_ITOV(ip));
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ switch (ip->i_d.di_format) {
+ case XFS_DINODE_FMT_DEV:
+ ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
+ break;
+ case XFS_DINODE_FMT_UUID:
+ ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
+ break;
+ case XFS_DINODE_FMT_LOCAL:
+ case XFS_DINODE_FMT_EXTENTS:
+ case XFS_DINODE_FMT_BTREE:
+ ip->i_d.di_forkoff = mp->m_attroffset >> 3;
+ break;
+ default:
+ ASSERT(0);
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+ ip->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
+ ASSERT(ip->i_afp == NULL);
+ ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
+ ip->i_afp->if_ext_max =
+ XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
+ ip->i_afp->if_flags = XFS_IFEXTENTS;
+ logflags = 0;
+ XFS_BMAP_INIT(&flist, &firstblock);
+ switch (ip->i_d.di_format) {
+ case XFS_DINODE_FMT_LOCAL:
+ error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
+ &logflags);
+ break;
+ case XFS_DINODE_FMT_EXTENTS:
+ error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
+ &flist, &logflags);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
+ &logflags);
+ break;
+ default:
+ error = 0;
+ break;
+ }
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (error)
+ goto error2;
+ if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
+ s = XFS_SB_LOCK(mp);
+ if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
+ XFS_SB_VERSION_ADDATTR(&mp->m_sb);
+ XFS_SB_UNLOCK(mp, s);
+ xfs_mod_sb(tp, XFS_SB_VERSIONNUM);
+ } else
+ XFS_SB_UNLOCK(mp, s);
+ }
+ if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed)))
+ goto error2;
+ error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES, NULL);
+ ASSERT(ip->i_df.if_ext_max ==
+ XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+ return error;
+error2:
+ xfs_bmap_cancel(&flist);
+error1:
+ ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+error0:
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+ ASSERT(ip->i_df.if_ext_max ==
+ XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+ return error;
+}
+
+/*
+ * Add the extent to the list of extents to be free at transaction end.
+ * The list is maintained sorted (by block number).
+ */
+/* ARGSUSED */
+void
+xfs_bmap_add_free(
+ xfs_fsblock_t bno, /* fs block number of extent */
+ xfs_filblks_t len, /* length of extent */
+ xfs_bmap_free_t *flist, /* list of extents */
+ xfs_mount_t *mp) /* mount point structure */
+{
+ xfs_bmap_free_item_t *cur; /* current (next) element */
+ xfs_bmap_free_item_t *new; /* new element */
+ xfs_bmap_free_item_t *prev; /* previous element */
+#ifdef DEBUG
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+
+ ASSERT(bno != NULLFSBLOCK);
+ ASSERT(len > 0);
+ ASSERT(len <= MAXEXTLEN);
+ ASSERT(!ISNULLSTARTBLOCK(bno));
+ agno = XFS_FSB_TO_AGNO(mp, bno);
+ agbno = XFS_FSB_TO_AGBNO(mp, bno);
+ ASSERT(agno < mp->m_sb.sb_agcount);
+ ASSERT(agbno < mp->m_sb.sb_agblocks);
+ ASSERT(len < mp->m_sb.sb_agblocks);
+ ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
+#endif
+ ASSERT(xfs_bmap_free_item_zone != NULL);
+ new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
+ new->xbfi_startblock = bno;
+ new->xbfi_blockcount = (xfs_extlen_t)len;
+ for (prev = NULL, cur = flist->xbf_first;
+ cur != NULL;
+ prev = cur, cur = cur->xbfi_next) {
+ if (cur->xbfi_startblock >= bno)
+ break;
+ }
+ if (prev)
+ prev->xbfi_next = new;
+ else
+ flist->xbf_first = new;
+ new->xbfi_next = cur;
+ flist->xbf_count++;
+}
+
+/*
+ * Compute and fill in the value of the maximum depth of a bmap btree
+ * in this filesystem. Done once, during mount.
+ */
+void
+xfs_bmap_compute_maxlevels(
+ xfs_mount_t *mp, /* file system mount structure */
+ int whichfork) /* data or attr fork */
+{
+ int level; /* btree level */
+ uint maxblocks; /* max blocks at this level */
+ uint maxleafents; /* max leaf entries possible */
+ int maxrootrecs; /* max records in root block */
+ int minleafrecs; /* min records in leaf block */
+ int minnoderecs; /* min records in node block */
+ int sz; /* root block size */
+
+ /*
+ * The maximum number of extents in a file, hence the maximum
+ * number of leaf entries, is controlled by the type of di_nextents
+ * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
+ * (a signed 16-bit number, xfs_aextnum_t).
+ */
+ maxleafents = (whichfork == XFS_DATA_FORK) ? MAXEXTNUM : MAXAEXTNUM;
+ minleafrecs = mp->m_bmap_dmnr[0];
+ minnoderecs = mp->m_bmap_dmnr[1];
+ sz = (whichfork == XFS_DATA_FORK) ?
+ mp->m_attroffset :
+ mp->m_sb.sb_inodesize - mp->m_attroffset;
+ maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
+ maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
+ for (level = 1; maxblocks > 1; level++) {
+ if (maxblocks <= maxrootrecs)
+ maxblocks = 1;
+ else
+ maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
+ }
+ mp->m_bm_maxlevels[whichfork] = level;
+}
+
+/*
+ * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
+ * caller. Frees all the extents that need freeing, which must be done
+ * last due to locking considerations. We never free any extents in
+ * the first transaction. This is to allow the caller to make the first
+ * transaction a synchronous one so that the pointers to the data being
+ * broken in this transaction will be permanent before the data is actually
+ * freed. This is necessary to prevent blocks from being reallocated
+ * and written to before the free and reallocation are actually permanent.
+ * We do not just make the first transaction synchronous here, because
+ * there are more efficient ways to gain the same protection in some cases
+ * (see the file truncation code).
+ *
+ * Return 1 if the given transaction was committed and a new one
+ * started, and 0 otherwise in the committed parameter.
+ */
+/*ARGSUSED*/
+int /* error */
+xfs_bmap_finish(
+ xfs_trans_t **tp, /* transaction pointer addr */
+ xfs_bmap_free_t *flist, /* i/o: list extents to free */
+ xfs_fsblock_t firstblock, /* controlled ag for allocs */
+ int *committed) /* xact committed or not */
+{
+ xfs_efd_log_item_t *efd; /* extent free data */
+ xfs_efi_log_item_t *efi; /* extent free intention */
+ int error; /* error return value */
+ xfs_bmap_free_item_t *free; /* free extent list item */
+ unsigned int logres; /* new log reservation */
+ unsigned int logcount; /* new log count */
+ xfs_mount_t *mp; /* filesystem mount structure */
+ xfs_bmap_free_item_t *next; /* next item on free list */
+ xfs_trans_t *ntp; /* new transaction pointer */
+
+ ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
+ if (flist->xbf_count == 0) {
+ *committed = 0;
+ return 0;
+ }
+ ntp = *tp;
+ efi = xfs_trans_get_efi(ntp, flist->xbf_count);
+ for (free = flist->xbf_first; free; free = free->xbfi_next)
+ xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
+ free->xbfi_blockcount);
+ logres = ntp->t_log_res;
+ logcount = ntp->t_log_count;
+ ntp = xfs_trans_dup(*tp);
+ error = xfs_trans_commit(*tp, 0, NULL);
+ *tp = ntp;
+ *committed = 1;
+ /*
+ * We have a new transaction, so we should return committed=1,
+ * even though we're returning an error.
+ */
+ if (error) {
+ return error;
+ }
+ if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
+ logcount)))
+ return error;
+ efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
+ for (free = flist->xbf_first; free != NULL; free = next) {
+ next = free->xbfi_next;
+ if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
+ free->xbfi_blockcount))) {
+ /*
+ * The bmap free list will be cleaned up at a
+ * higher level. The EFI will be canceled when
+ * this transaction is aborted.
+ * Need to force shutdown here to make sure it
+ * happens, since this transaction may not be
+ * dirty yet.
+ */
+ mp = ntp->t_mountp;
+ if (!XFS_FORCED_SHUTDOWN(mp))
+ xfs_force_shutdown(mp,
+ (error == EFSCORRUPTED) ?
+ XFS_CORRUPT_INCORE :
+ XFS_METADATA_IO_ERROR);
+ return error;
+ }
+ xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
+ free->xbfi_blockcount);
+ xfs_bmap_del_free(flist, NULL, free);
+ }
+ return 0;
+}
+
+/*
+ * Free up any items left in the list.
+ */
+void
+xfs_bmap_cancel(
+ xfs_bmap_free_t *flist) /* list of bmap_free_items */
+{
+ xfs_bmap_free_item_t *free; /* free list item */
+ xfs_bmap_free_item_t *next;
+
+ if (flist->xbf_count == 0)
+ return;
+ ASSERT(flist->xbf_first != NULL);
+ for (free = flist->xbf_first; free; free = next) {
+ next = free->xbfi_next;
+ xfs_bmap_del_free(flist, NULL, free);
+ }
+ ASSERT(flist->xbf_count == 0);
+}
+
+/*
+ * Returns the file-relative block number of the first unused block(s)
+ * in the file with at least "len" logically contiguous blocks free.
+ * This is the lowest-address hole if the file has holes, else the first block
+ * past the end of file.
+ * Return 0 if the file is currently local (in-inode).
+ */
+int /* error */
+xfs_bmap_first_unused(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_extlen_t len, /* size of hole to find */
+ xfs_fileoff_t *first_unused, /* unused block */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* base of extent array */
+ xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_fileoff_t lastaddr; /* last block number seen */
+ xfs_fileoff_t lowest; /* lowest useful block */
+ xfs_fileoff_t max; /* starting useful block */
+ xfs_fileoff_t off; /* offset for this block */
+ xfs_extnum_t nextents; /* number of extent entries */
+
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ *first_unused = 0;
+ return 0;
+ }
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ lowest = *first_unused;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ base = &ifp->if_u1.if_extents[0];
+ for (lastaddr = 0, max = lowest, ep = base;
+ ep < &base[nextents];
+ ep++) {
+ off = xfs_bmbt_get_startoff(ep);
+ /*
+ * See if the hole before this extent will work.
+ */
+ if (off >= lowest + len && off - max >= len) {
+ *first_unused = max;
+ return 0;
+ }
+ lastaddr = off + xfs_bmbt_get_blockcount(ep);
+ max = XFS_FILEOFF_MAX(lastaddr, lowest);
+ }
+ *first_unused = max;
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the last block + 1 before
+ * last_block (input value) in the file.
+ * This is not based on i_size, it is based on the extent list.
+ * Returns 0 for local files, as they do not have an extent list.
+ */
+int /* error */
+xfs_bmap_last_before(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_fileoff_t *last_block, /* last block */
+ int whichfork) /* data or attr fork */
+{
+ xfs_fileoff_t bno; /* input file offset */
+ int eof; /* hit end of file */
+ xfs_bmbt_rec_t *ep; /* pointer to last extent */
+ int error; /* error return value */
+ xfs_bmbt_irec_t got; /* current extent value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t lastx; /* last extent used */
+ xfs_bmbt_irec_t prev; /* previous extent value */
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EIO);
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ *last_block = 0;
+ return 0;
+ }
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ bno = *last_block - 1;
+ ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+ if (eof || xfs_bmbt_get_startoff(ep) > bno) {
+ if (prev.br_startoff == NULLFILEOFF)
+ *last_block = 0;
+ else
+ *last_block = prev.br_startoff + prev.br_blockcount;
+ }
+ /*
+ * Otherwise *last_block is already the right answer.
+ */
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the first block past eof in
+ * the file. This is not based on i_size, it is based on the extent list.
+ * Returns 0 for local files, as they do not have an extent list.
+ */
+int /* error */
+xfs_bmap_last_offset(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_fileoff_t *last_block, /* last block */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* base of extent array */
+ xfs_bmbt_rec_t *ep; /* pointer to last extent */
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t nextents; /* number of extent entries */
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EIO);
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ *last_block = 0;
+ return 0;
+ }
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ if (!nextents) {
+ *last_block = 0;
+ return 0;
+ }
+ base = &ifp->if_u1.if_extents[0];
+ ASSERT(base != NULL);
+ ep = &base[nextents - 1];
+ *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
+ return 0;
+}
+
+/*
+ * Returns whether the selected fork of the inode has exactly one
+ * block or not. For the data fork we check this matches di_size,
+ * implying the file's range is 0..bsize-1.
+ */
+int /* 1=>1 block, 0=>otherwise */
+xfs_bmap_one_block(
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *ep; /* ptr to fork's extent */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ int rval; /* return value */
+ xfs_bmbt_irec_t s; /* internal version of extent */
+
+#ifndef DEBUG
+ if (whichfork == XFS_DATA_FORK)
+ return ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize;
+#endif /* !DEBUG */
+ if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
+ return 0;
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ return 0;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ ep = ifp->if_u1.if_extents;
+ xfs_bmbt_get_all(ep, &s);
+ rval = s.br_startoff == 0 && s.br_blockcount == 1;
+ if (rval && whichfork == XFS_DATA_FORK)
+ ASSERT(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
+ return rval;
+}
+
+/*
+ * Read in the extents to if_extents.
+ * All inode fields are set up by caller, we just traverse the btree
+ * and copy the records in. If the file system cannot contain unwritten
+ * extents, the records are checked for no "state" flags.
+ */
+int /* error */
+xfs_bmap_read_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_block_t *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_buf_t *bp; /* buffer for "block" */
+ int error; /* error return value */
+ xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
+#ifdef XFS_BMAP_TRACE
+ static char fname[] = "xfs_bmap_read_extents";
+#endif
+ xfs_extnum_t i, j; /* index into the extents list */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ xfs_bmbt_ptr_t *pp; /* pointer to block address */
+ /* REFERENCED */
+ xfs_extnum_t room; /* number of entries there's room for */
+ xfs_bmbt_rec_t *trp; /* target record pointer */
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
+ XFS_EXTFMT_INODE(ip);
+ block = ifp->if_broot;
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+ level = INT_GET(block->bb_level, ARCH_CONVERT);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+ ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+ /*
+ * Go down the tree until leaf level is reached, following the first
+ * pointer (leftmost) at each level.
+ */
+ while (level-- > 0) {
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+ XFS_WANT_CORRUPTED_GOTO(
+ XFS_BMAP_SANITY_CHECK(mp, block, level),
+ error0);
+ if (level == 0)
+ break;
+ pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
+ 1, mp->m_bmap_dmxr[1]);
+ XFS_WANT_CORRUPTED_GOTO(
+ XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)),
+ error0);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+ xfs_trans_brelse(tp, bp);
+ }
+ /*
+ * Here with bp and block set to the leftmost leaf node in the tree.
+ */
+ room = ifp->if_bytes / (uint)sizeof(*trp);
+ trp = ifp->if_u1.if_extents;
+ i = 0;
+ /*
+ * Loop over all leaf nodes. Copy information to the extent list.
+ */
+ for (;;) {
+ xfs_bmbt_rec_t *frp, *temp;
+ xfs_fsblock_t nextbno;
+ xfs_extnum_t num_recs;
+
+
+ num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+ if (unlikely(i + num_recs > room)) {
+ ASSERT(i + num_recs <= room);
+ xfs_fs_cmn_err(CE_WARN, ip->i_mount,
+ "corrupt dinode %Lu, (btree extents). Unmount and run xfs_repair.",
+ (unsigned long long) ip->i_ino);
+ XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
+ XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ goto error0;
+ }
+ XFS_WANT_CORRUPTED_GOTO(
+ XFS_BMAP_SANITY_CHECK(mp, block, 0),
+ error0);
+ /*
+ * Read-ahead the next leaf block, if any.
+ */
+ nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+ if (nextbno != NULLFSBLOCK)
+ xfs_btree_reada_bufl(mp, nextbno, 1);
+ /*
+ * Copy records into the extent list.
+ */
+ frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
+ block, 1, mp->m_bmap_dmxr[0]);
+ temp = trp;
+ for (j = 0; j < num_recs; j++, frp++, trp++) {
+ trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
+ trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
+ }
+ if (exntf == XFS_EXTFMT_NOSTATE) {
+ /*
+ * Check all attribute bmap btree records and
+ * any "older" data bmap btree records for a
+ * set bit in the "extent flag" position.
+ */
+ if (unlikely(xfs_check_nostate_extents(temp, num_recs))) {
+ XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
+ XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ goto error0;
+ }
+ }
+ i += num_recs;
+ xfs_trans_brelse(tp, bp);
+ bno = nextbno;
+ /*
+ * If we've reached the end, stop.
+ */
+ if (bno == NULLFSBLOCK)
+ break;
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+ }
+ ASSERT(i == ifp->if_bytes / (uint)sizeof(*trp));
+ ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
+ xfs_bmap_trace_exlist(fname, ip, i, whichfork);
+ return 0;
+error0:
+ xfs_trans_brelse(tp, bp);
+ return XFS_ERROR(EFSCORRUPTED);
+}
+
+#ifdef XFS_BMAP_TRACE
+/*
+ * Add bmap trace insert entries for all the contents of the extent list.
+ */
+void
+xfs_bmap_trace_exlist(
+ char *fname, /* function name */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t cnt, /* count of entries in the list */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* base of extent list */
+ xfs_bmbt_rec_t *ep; /* current entry in extent list */
+ xfs_extnum_t idx; /* extent list entry number */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_irec_t s; /* extent list record */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(cnt == ifp->if_bytes / (uint)sizeof(*base));
+ base = ifp->if_u1.if_extents;
+ for (idx = 0, ep = base; idx < cnt; idx++, ep++) {
+ xfs_bmbt_get_all(ep, &s);
+ xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
+ whichfork);
+ }
+}
+#endif
+
+#ifdef DEBUG
+/*
+ * Validate that the bmbt_irecs being returned from bmapi are valid
+ * given the callers original parameters. Specifically check the
+ * ranges of the returned irecs to ensure that they only extent beyond
+ * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
+ */
+STATIC void
+xfs_bmap_validate_ret(
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ xfs_bmbt_irec_t *mval,
+ int nmap,
+ int ret_nmap)
+{
+ int i; /* index to map values */
+
+ ASSERT(ret_nmap <= nmap);
+
+ for (i = 0; i < ret_nmap; i++) {
+ ASSERT(mval[i].br_blockcount > 0);
+ if (!(flags & XFS_BMAPI_ENTIRE)) {
+ ASSERT(mval[i].br_startoff >= bno);
+ ASSERT(mval[i].br_blockcount <= len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
+ bno + len);
+ } else {
+ ASSERT(mval[i].br_startoff < bno + len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
+ bno);
+ }
+ ASSERT(i == 0 ||
+ mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
+ mval[i].br_startoff);
+ if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
+ ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
+ mval[i].br_startblock != HOLESTARTBLOCK);
+ ASSERT(mval[i].br_state == XFS_EXT_NORM ||
+ mval[i].br_state == XFS_EXT_UNWRITTEN);
+ }
+}
+#endif /* DEBUG */
+
+
+/*
+ * Map file blocks to filesystem blocks.
+ * File range is given by the bno/len pair.
+ * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
+ * into a hole or past eof.
+ * Only allocates blocks from a single allocation group,
+ * to avoid locking problems.
+ * The returned value in "firstblock" from the first call in a transaction
+ * must be remembered and presented to subsequent calls in "firstblock".
+ * An upper bound for the number of blocks to be allocated is supplied to
+ * the first call in "total"; if no allocation group has that many free
+ * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
+ */
+int /* error */
+xfs_bmapi(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting file offs. mapped */
+ xfs_filblks_t len, /* length to map in file */
+ int flags, /* XFS_BMAPI_... */
+ xfs_fsblock_t *firstblock, /* first allocated block
+ controls a.g. for allocs */
+ xfs_extlen_t total, /* total blocks needed */
+ xfs_bmbt_irec_t *mval, /* output: map values */
+ int *nmap, /* i/o: mval size/count */
+ xfs_bmap_free_t *flist) /* i/o: list extents to free */
+{
+ xfs_fsblock_t abno; /* allocated block number */
+ xfs_extlen_t alen; /* allocated extent length */
+ xfs_fileoff_t aoff; /* allocated file offset */
+ xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
+ char contig; /* allocation must be one extent */
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ char delay; /* this request is for delayed alloc */
+ xfs_fileoff_t end; /* end of mapped file region */
+ int eof; /* we've hit the end of extent list */
+ xfs_bmbt_rec_t *ep; /* extent list entry pointer */
+ int error; /* error return */
+ char exact; /* don't do all of wasdelayed extent */
+ xfs_bmbt_irec_t got; /* current extent list record */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extlen_t indlen; /* indirect blocks length */
+ char inhole; /* current location is hole in file */
+ xfs_extnum_t lastx; /* last useful extent number */
+ int logflags; /* flags for transaction logging */
+ xfs_extlen_t minleft; /* min blocks left after allocation */
+ xfs_extlen_t minlen; /* min allocation size */
+ xfs_mount_t *mp; /* xfs mount structure */
+ int n; /* current extent index */
+ int nallocs; /* number of extents alloc\'d */
+ xfs_extnum_t nextents; /* number of extents in file */
+ xfs_fileoff_t obno; /* old block number (offset) */
+ xfs_bmbt_irec_t prev; /* previous extent list record */
+ char stateless; /* ignore state flag set */
+ int tmp_logflags; /* temp flags holder */
+ char trim; /* output trimmed to match range */
+ char userdata; /* allocating non-metadata */
+ char wasdelay; /* old extent was delayed */
+ int whichfork; /* data or attr fork */
+ char wr; /* this is a write request */
+ char rsvd; /* OK to allocate reserved blocks */
+#ifdef DEBUG
+ xfs_fileoff_t orig_bno; /* original block number value */
+ int orig_flags; /* original flags arg value */
+ xfs_filblks_t orig_len; /* original value of len arg */
+ xfs_bmbt_irec_t *orig_mval; /* original value of mval */
+ int orig_nmap; /* original value of *nmap */
+
+ orig_bno = bno;
+ orig_len = len;
+ orig_flags = flags;
+ orig_mval = mval;
+ orig_nmap = *nmap;
+#endif
+ ASSERT(*nmap >= 1);
+ ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
+ whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ mp = ip->i_mount;
+ if (unlikely(XFS_TEST_ERROR(
+ (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
+ mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
+ XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
+ XFS_STATS_INC(xs_blk_mapw);
+ else
+ XFS_STATS_INC(xs_blk_mapr);
+ delay = (flags & XFS_BMAPI_DELAY) != 0;
+ trim = (flags & XFS_BMAPI_ENTIRE) == 0;
+ userdata = (flags & XFS_BMAPI_METADATA) == 0;
+ exact = (flags & XFS_BMAPI_EXACT) != 0;
+ rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
+ contig = (flags & XFS_BMAPI_CONTIG) != 0;
+ /*
+ * stateless is used to combine extents which
+ * differ only due to the state of the extents.
+ * This technique is used from xfs_getbmap()
+ * when the caller does not wish to see the
+ * separation (which is the default).
+ *
+ * This technique is also used when writing a
+ * buffer which has been partially written,
+ * (usually by being flushed during a chunkread),
+ * to ensure one write takes place. This also
+ * prevents a change in the xfs inode extents at
+ * this time, intentionally. This change occurs
+ * on completion of the write operation, in
+ * xfs_strat_comp(), where the xfs_bmapi() call
+ * is transactioned, and the extents combined.
+ */
+ stateless = (flags & XFS_BMAPI_IGSTATE) != 0;
+ if (stateless && wr) /* if writing unwritten space, no */
+ wr = 0; /* allocations are allowed */
+ ASSERT(wr || !delay);
+ logflags = 0;
+ nallocs = 0;
+ cur = NULL;
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ ASSERT(wr && tp);
+ if ((error = xfs_bmap_local_to_extents(tp, ip,
+ firstblock, total, &logflags, whichfork)))
+ goto error0;
+ }
+ if (wr && *firstblock == NULLFSBLOCK) {
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
+ minleft = INT_GET(ifp->if_broot->bb_level, ARCH_CONVERT) + 1;
+ else
+ minleft = 1;
+ } else
+ minleft = 0;
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ goto error0;
+ ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ n = 0;
+ end = bno + len;
+ obno = bno;
+ bma.ip = NULL;
+ while (bno < end && n < *nmap) {
+ /*
+ * Reading past eof, act as though there's a hole
+ * up to end.
+ */
+ if (eof && !wr)
+ got.br_startoff = end;
+ inhole = eof || got.br_startoff > bno;
+ wasdelay = wr && !inhole && !delay &&
+ ISNULLSTARTBLOCK(got.br_startblock);
+ /*
+ * First, deal with the hole before the allocated space
+ * that we found, if any.
+ */
+ if (wr && (inhole || wasdelay)) {
+ /*
+ * For the wasdelay case, we could also just
+ * allocate the stuff asked for in this bmap call
+ * but that wouldn't be as good.
+ */
+ if (wasdelay && !exact) {
+ alen = (xfs_extlen_t)got.br_blockcount;
+ aoff = got.br_startoff;
+ if (lastx != NULLEXTNUM && lastx) {
+ ep = &ifp->if_u1.if_extents[lastx - 1];
+ xfs_bmbt_get_all(ep, &prev);
+ }
+ } else if (wasdelay) {
+ alen = (xfs_extlen_t)
+ XFS_FILBLKS_MIN(len,
+ (got.br_startoff +
+ got.br_blockcount) - bno);
+ aoff = bno;
+ } else {
+ alen = (xfs_extlen_t)
+ XFS_FILBLKS_MIN(len, MAXEXTLEN);
+ if (!eof)
+ alen = (xfs_extlen_t)
+ XFS_FILBLKS_MIN(alen,
+ got.br_startoff - bno);
+ aoff = bno;
+ }
+ minlen = contig ? alen : 1;
+ if (delay) {
+ indlen = (xfs_extlen_t)
+ xfs_bmap_worst_indlen(ip, alen);
+ ASSERT(indlen > 0);
+ /*
+ * Make a transaction-less quota reservation for
+ * delayed allocation blocks. This number gets
+ * adjusted later.
+ * We return EDQUOT if we haven't allocated
+ * blks already inside this loop;
+ */
+ if (XFS_TRANS_RESERVE_BLKQUOTA(
+ mp, NULL, ip, (long)alen)) {
+ if (n == 0) {
+ *nmap = 0;
+ ASSERT(cur == NULL);
+ return XFS_ERROR(EDQUOT);
+ }
+ break;
+ }
+
+ /*
+ * Split changing sb for alen and indlen since
+ * they could be coming from different places.
+ */
+ if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
+ xfs_extlen_t extsz;
+ xfs_extlen_t ralen;
+ if (!(extsz = ip->i_d.di_extsize))
+ extsz = mp->m_sb.sb_rextsize;
+ ralen = roundup(alen, extsz);
+ ralen = ralen / mp->m_sb.sb_rextsize;
+ if (xfs_mod_incore_sb(mp,
+ XFS_SBS_FREXTENTS,
+ -(ralen), rsvd)) {
+ if (XFS_IS_QUOTA_ON(ip->i_mount))
+ XFS_TRANS_UNRESERVE_BLKQUOTA(
+ mp, NULL, ip,
+ (long)alen);
+ break;
+ }
+ } else {
+ if (xfs_mod_incore_sb(mp,
+ XFS_SBS_FDBLOCKS,
+ -(alen), rsvd)) {
+ if (XFS_IS_QUOTA_ON(ip->i_mount))
+ XFS_TRANS_UNRESERVE_BLKQUOTA(
+ mp, NULL, ip,
+ (long)alen);
+ break;
+ }
+ }
+
+ if (xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
+ -(indlen), rsvd)) {
+ XFS_TRANS_UNRESERVE_BLKQUOTA(
+ mp, NULL, ip, (long)alen);
+ break;
+ }
+ ip->i_delayed_blks += alen;
+ abno = NULLSTARTBLOCK(indlen);
+ } else {
+ /*
+ * If first time, allocate and fill in
+ * once-only bma fields.
+ */
+ if (bma.ip == NULL) {
+ bma.tp = tp;
+ bma.ip = ip;
+ bma.prevp = &prev;
+ bma.gotp = &got;
+ bma.total = total;
+ bma.userdata = 0;
+ }
+ /* Indicate if this is the first user data
+ * in the file, or just any user data.
+ */
+ if (userdata) {
+ bma.userdata = (aoff == 0) ?
+ XFS_ALLOC_INITIAL_USER_DATA :
+ XFS_ALLOC_USERDATA;
+ }
+ /*
+ * Fill in changeable bma fields.
+ */
+ bma.eof = eof;
+ bma.firstblock = *firstblock;
+ bma.alen = alen;
+ bma.off = aoff;
+ bma.wasdel = wasdelay;
+ bma.minlen = minlen;
+ bma.low = flist->xbf_low;
+ bma.minleft = minleft;
+ /*
+ * Only want to do the alignment at the
+ * eof if it is userdata and allocation length
+ * is larger than a stripe unit.
+ */
+ if (mp->m_dalign && alen >= mp->m_dalign &&
+ userdata && whichfork == XFS_DATA_FORK) {
+ if ((error = xfs_bmap_isaeof(ip, aoff,
+ whichfork, &bma.aeof)))
+ goto error0;
+ } else
+ bma.aeof = 0;
+ /*
+ * Call allocator.
+ */
+ if ((error = xfs_bmap_alloc(&bma)))
+ goto error0;
+ /*
+ * Copy out result fields.
+ */
+ abno = bma.rval;
+ if ((flist->xbf_low = bma.low))
+ minleft = 0;
+ alen = bma.alen;
+ aoff = bma.off;
+ ASSERT(*firstblock == NULLFSBLOCK ||
+ XFS_FSB_TO_AGNO(mp, *firstblock) ==
+ XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
+ (flist->xbf_low &&
+ XFS_FSB_TO_AGNO(mp, *firstblock) <
+ XFS_FSB_TO_AGNO(mp, bma.firstblock)));
+ *firstblock = bma.firstblock;
+ if (cur)
+ cur->bc_private.b.firstblock =
+ *firstblock;
+ if (abno == NULLFSBLOCK)
+ break;
+ if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
+ cur = xfs_btree_init_cursor(mp,
+ tp, NULL, 0, XFS_BTNUM_BMAP,
+ ip, whichfork);
+ cur->bc_private.b.firstblock =
+ *firstblock;
+ cur->bc_private.b.flist = flist;
+ }
+ /*
+ * Bump the number of extents we've allocated
+ * in this call.
+ */
+ nallocs++;
+ }
+ if (cur)
+ cur->bc_private.b.flags =
+ wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
+ got.br_startoff = aoff;
+ got.br_startblock = abno;
+ got.br_blockcount = alen;
+ got.br_state = XFS_EXT_NORM; /* assume normal */
+ /*
+ * Determine state of extent, and the filesystem.
+ * A wasdelay extent has been initialized, so
+ * shouldn't be flagged as unwritten.
+ */
+ if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+ if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
+ got.br_state = XFS_EXT_UNWRITTEN;
+ }
+ error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
+ firstblock, flist, &tmp_logflags, whichfork,
+ rsvd);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ lastx = ifp->if_lastex;
+ ep = &ifp->if_u1.if_extents[lastx];
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ xfs_bmbt_get_all(ep, &got);
+ ASSERT(got.br_startoff <= aoff);
+ ASSERT(got.br_startoff + got.br_blockcount >=
+ aoff + alen);
+#ifdef DEBUG
+ if (delay) {
+ ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
+ ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
+ }
+ ASSERT(got.br_state == XFS_EXT_NORM ||
+ got.br_state == XFS_EXT_UNWRITTEN);
+#endif
+ /*
+ * Fall down into the found allocated space case.
+ */
+ } else if (inhole) {
+ /*
+ * Reading in a hole.
+ */
+ mval->br_startoff = bno;
+ mval->br_startblock = HOLESTARTBLOCK;
+ mval->br_blockcount =
+ XFS_FILBLKS_MIN(len, got.br_startoff - bno);
+ mval->br_state = XFS_EXT_NORM;
+ bno += mval->br_blockcount;
+ len -= mval->br_blockcount;
+ mval++;
+ n++;
+ continue;
+ }
+ /*
+ * Then deal with the allocated space we found.
+ */
+ ASSERT(ep != NULL);
+ if (trim && (got.br_startoff + got.br_blockcount > obno)) {
+ if (obno > bno)
+ bno = obno;
+ ASSERT((bno >= obno) || (n == 0));
+ ASSERT(bno < end);
+ mval->br_startoff = bno;
+ if (ISNULLSTARTBLOCK(got.br_startblock)) {
+ ASSERT(!wr || delay);
+ mval->br_startblock = DELAYSTARTBLOCK;
+ } else
+ mval->br_startblock =
+ got.br_startblock +
+ (bno - got.br_startoff);
+ /*
+ * Return the minimum of what we got and what we
+ * asked for for the length. We can use the len
+ * variable here because it is modified below
+ * and we could have been there before coming
+ * here if the first part of the allocation
+ * didn't overlap what was asked for.
+ */
+ mval->br_blockcount =
+ XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
+ (bno - got.br_startoff));
+ mval->br_state = got.br_state;
+ ASSERT(mval->br_blockcount <= len);
+ } else {
+ *mval = got;
+ if (ISNULLSTARTBLOCK(mval->br_startblock)) {
+ ASSERT(!wr || delay);
+ mval->br_startblock = DELAYSTARTBLOCK;
+ }
+ }
+
+ /*
+ * Check if writing previously allocated but
+ * unwritten extents.
+ */
+ if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
+ ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
+ /*
+ * Modify (by adding) the state flag, if writing.
+ */
+ ASSERT(mval->br_blockcount <= len);
+ if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
+ cur = xfs_btree_init_cursor(mp,
+ tp, NULL, 0, XFS_BTNUM_BMAP,
+ ip, whichfork);
+ cur->bc_private.b.firstblock =
+ *firstblock;
+ cur->bc_private.b.flist = flist;
+ }
+ mval->br_state = XFS_EXT_NORM;
+ error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
+ firstblock, flist, &tmp_logflags, whichfork,
+ rsvd);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ lastx = ifp->if_lastex;
+ ep = &ifp->if_u1.if_extents[lastx];
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ xfs_bmbt_get_all(ep, &got);
+ /*
+ * We may have combined previously unwritten
+ * space with written space, so generate
+ * another request.
+ */
+ if (mval->br_blockcount < len)
+ continue;
+ }
+
+ ASSERT(!trim ||
+ ((mval->br_startoff + mval->br_blockcount) <= end));
+ ASSERT(!trim || (mval->br_blockcount <= len) ||
+ (mval->br_startoff < obno));
+ bno = mval->br_startoff + mval->br_blockcount;
+ len = end - bno;
+ if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
+ ASSERT(mval->br_startblock == mval[-1].br_startblock);
+ ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
+ ASSERT(mval->br_state == mval[-1].br_state);
+ mval[-1].br_blockcount = mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != HOLESTARTBLOCK &&
+ mval->br_startblock ==
+ mval[-1].br_startblock + mval[-1].br_blockcount &&
+ (stateless || mval[-1].br_state == mval->br_state)) {
+ ASSERT(mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount);
+ mval[-1].br_blockcount += mval->br_blockcount;
+ } else if (n > 0 &&
+ mval->br_startblock == DELAYSTARTBLOCK &&
+ mval[-1].br_startblock == DELAYSTARTBLOCK &&
+ mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount) {
+ mval[-1].br_blockcount += mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (!((n == 0) &&
+ ((mval->br_startoff + mval->br_blockcount) <=
+ obno))) {
+ mval++;
+ n++;
+ }
+ /*
+ * If we're done, stop now. Stop when we've allocated
+ * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
+ * the transaction may get too big.
+ */
+ if (bno >= end || n >= *nmap || nallocs >= *nmap)
+ break;
+ /*
+ * Else go on to the next record.
+ */
+ ep++;
+ lastx++;
+ if (lastx >= nextents) {
+ eof = 1;
+ prev = got;
+ } else
+ xfs_bmbt_get_all(ep, &got);
+ }
+ ifp->if_lastex = lastx;
+ *nmap = n;
+ /*
+ * Transform from btree to extents, give it cur.
+ */
+ if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
+ ASSERT(wr && cur);
+ error = xfs_bmap_btree_to_extents(tp, ip, cur,
+ &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
+ XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
+ error = 0;
+
+error0:
+ /*
+ * Log everything. Do this after conversion, there's no point in
+ * logging the extent list if we've converted to btree format.
+ */
+ if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ logflags &= ~XFS_ILOG_FEXT(whichfork);
+ else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+ logflags &= ~XFS_ILOG_FBROOT(whichfork);
+ /*
+ * Log whatever the flags say, even if error. Otherwise we might miss
+ * detecting a case where the data is changed, there's an error,
+ * and it's not logged so we don't shutdown when we should.
+ */
+ if (logflags) {
+ ASSERT(tp && wr);
+ xfs_trans_log_inode(tp, ip, logflags);
+ }
+ if (cur) {
+ if (!error) {
+ ASSERT(*firstblock == NULLFSBLOCK ||
+ XFS_FSB_TO_AGNO(mp, *firstblock) ==
+ XFS_FSB_TO_AGNO(mp,
+ cur->bc_private.b.firstblock) ||
+ (flist->xbf_low &&
+ XFS_FSB_TO_AGNO(mp, *firstblock) <
+ XFS_FSB_TO_AGNO(mp,
+ cur->bc_private.b.firstblock)));
+ *firstblock = cur->bc_private.b.firstblock;
+ }
+ xfs_btree_del_cursor(cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ if (!error)
+ xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
+ orig_nmap, *nmap);
+ return error;
+}
+
+/*
+ * Map file blocks to filesystem blocks, simple version.
+ * One block (extent) only, read-only.
+ * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
+ * For the other flag values, the effect is as if XFS_BMAPI_METADATA
+ * was set and all the others were clear.
+ */
+int /* error */
+xfs_bmapi_single(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork, /* data or attr fork */
+ xfs_fsblock_t *fsb, /* output: mapped block */
+ xfs_fileoff_t bno) /* starting file offs. mapped */
+{
+ int eof; /* we've hit the end of extent list */
+ int error; /* error return */
+ xfs_bmbt_irec_t got; /* current extent list record */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t lastx; /* last useful extent number */
+ xfs_bmbt_irec_t prev; /* previous extent list record */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (unlikely(
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
+ XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return XFS_ERROR(EIO);
+ XFS_STATS_INC(xs_blk_mapr);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+ /*
+ * Reading past eof, act as though there's a hole
+ * up to end.
+ */
+ if (eof || got.br_startoff > bno) {
+ *fsb = NULLFSBLOCK;
+ return 0;
+ }
+ ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
+ ASSERT(bno < got.br_startoff + got.br_blockcount);
+ *fsb = got.br_startblock + (bno - got.br_startoff);
+ ifp->if_lastex = lastx;
+ return 0;
+}
+
+/*
+ * Unmap (remove) blocks from a file.
+ * If nexts is nonzero then the number of extents to remove is limited to
+ * that value. If not all extents in the block range can be removed then
+ * *done is set.
+ */
+int /* error */
+xfs_bunmapi(
+ xfs_trans_t *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting offset to unmap */
+ xfs_filblks_t len, /* length to unmap in file */
+ int flags, /* misc flags */
+ xfs_extnum_t nexts, /* number of extents max */
+ xfs_fsblock_t *firstblock, /* first allocated block
+ controls a.g. for allocs */
+ xfs_bmap_free_t *flist, /* i/o: list extents to free */
+ int *done) /* set if not done yet */
+{
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ xfs_bmbt_irec_t del; /* extent being deleted */
+ int eof; /* is deleting at eof */
+ xfs_bmbt_rec_t *ep; /* extent list entry pointer */
+ int error; /* error return value */
+ xfs_extnum_t extno; /* extent number in list */
+ xfs_bmbt_irec_t got; /* current extent list entry */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ int isrt; /* freeing in rt area */
+ xfs_extnum_t lastx; /* last extent index used */
+ int logflags; /* transaction logging flags */
+ xfs_extlen_t mod; /* rt extent offset */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_extnum_t nextents; /* size of extent list */
+ xfs_bmbt_irec_t prev; /* previous extent list entry */
+ xfs_fileoff_t start; /* first file offset deleted */
+ int tmp_logflags; /* partial logging flags */
+ int wasdel; /* was a delayed alloc extent */
+ int whichfork; /* data or attribute fork */
+ int rsvd; /* OK to allocate reserved blocks */
+ xfs_fsblock_t sum;
+
+ xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
+ whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (unlikely(
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
+ XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ mp = ip->i_mount;
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+ rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
+ ASSERT(len > 0);
+ ASSERT(nexts >= 0);
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ if (nextents == 0) {
+ *done = 1;
+ return 0;
+ }
+ XFS_STATS_INC(xs_blk_unmap);
+ isrt = (whichfork == XFS_DATA_FORK) &&
+ (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
+ start = bno;
+ bno = start + len - 1;
+ ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+ /*
+ * Check to see if the given block number is past the end of the
+ * file, back up to the last block if so...
+ */
+ if (eof) {
+ ep = &ifp->if_u1.if_extents[--lastx];
+ xfs_bmbt_get_all(ep, &got);
+ bno = got.br_startoff + got.br_blockcount - 1;
+ }
+ logflags = 0;
+ if (ifp->if_flags & XFS_IFBROOT) {
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+ cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+ whichfork);
+ cur->bc_private.b.firstblock = *firstblock;
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.flags = 0;
+ } else
+ cur = NULL;
+ extno = 0;
+ while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
+ (nexts == 0 || extno < nexts)) {
+ /*
+ * Is the found extent after a hole in which bno lives?
+ * Just back up to the previous extent, if so.
+ */
+ if (got.br_startoff > bno) {
+ if (--lastx < 0)
+ break;
+ ep--;
+ xfs_bmbt_get_all(ep, &got);
+ }
+ /*
+ * Is the last block of this extent before the range
+ * we're supposed to delete? If so, we're done.
+ */
+ bno = XFS_FILEOFF_MIN(bno,
+ got.br_startoff + got.br_blockcount - 1);
+ if (bno < start)
+ break;
+ /*
+ * Then deal with the (possibly delayed) allocated space
+ * we found.
+ */
+ ASSERT(ep != NULL);
+ del = got;
+ wasdel = ISNULLSTARTBLOCK(del.br_startblock);
+ if (got.br_startoff < start) {
+ del.br_startoff = start;
+ del.br_blockcount -= start - got.br_startoff;
+ if (!wasdel)
+ del.br_startblock += start - got.br_startoff;
+ }
+ if (del.br_startoff + del.br_blockcount > bno + 1)
+ del.br_blockcount = bno + 1 - del.br_startoff;
+ sum = del.br_startblock + del.br_blockcount;
+ if (isrt &&
+ (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
+ /*
+ * Realtime extent not lined up at the end.
+ * The extent could have been split into written
+ * and unwritten pieces, or we could just be
+ * unmapping part of it. But we can't really
+ * get rid of part of a realtime extent.
+ */
+ if (del.br_state == XFS_EXT_UNWRITTEN ||
+ !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+ /*
+ * This piece is unwritten, or we're not
+ * using unwritten extents. Skip over it.
+ */
+ ASSERT(bno >= mod);
+ bno -= mod > del.br_blockcount ?
+ del.br_blockcount : mod;
+ if (bno < got.br_startoff) {
+ if (--lastx >= 0)
+ xfs_bmbt_get_all(--ep, &got);
+ }
+ continue;
+ }
+ /*
+ * It's written, turn it unwritten.
+ * This is better than zeroing it.
+ */
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ ASSERT(xfs_trans_get_block_res(tp) > 0);
+ /*
+ * If this spans a realtime extent boundary,
+ * chop it back to the start of the one we end at.
+ */
+ if (del.br_blockcount > mod) {
+ del.br_startoff += del.br_blockcount - mod;
+ del.br_startblock += del.br_blockcount - mod;
+ del.br_blockcount = mod;
+ }
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
+ firstblock, flist, &logflags, XFS_DATA_FORK, 0);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
+ /*
+ * Realtime extent is lined up at the end but not
+ * at the front. We'll get rid of full extents if
+ * we can.
+ */
+ mod = mp->m_sb.sb_rextsize - mod;
+ if (del.br_blockcount > mod) {
+ del.br_blockcount -= mod;
+ del.br_startoff += mod;
+ del.br_startblock += mod;
+ } else if ((del.br_startoff == start &&
+ (del.br_state == XFS_EXT_UNWRITTEN ||
+ xfs_trans_get_block_res(tp) == 0)) ||
+ !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+ /*
+ * Can't make it unwritten. There isn't
+ * a full extent here so just skip it.
+ */
+ ASSERT(bno >= del.br_blockcount);
+ bno -= del.br_blockcount;
+ if (bno < got.br_startoff) {
+ if (--lastx >= 0)
+ xfs_bmbt_get_all(--ep, &got);
+ }
+ continue;
+ } else if (del.br_state == XFS_EXT_UNWRITTEN) {
+ /*
+ * This one is already unwritten.
+ * It must have a written left neighbor.
+ * Unwrite the killed part of that one and
+ * try again.
+ */
+ ASSERT(lastx > 0);
+ xfs_bmbt_get_all(ep - 1, &prev);
+ ASSERT(prev.br_state == XFS_EXT_NORM);
+ ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
+ ASSERT(del.br_startblock ==
+ prev.br_startblock + prev.br_blockcount);
+ if (prev.br_startoff < start) {
+ mod = start - prev.br_startoff;
+ prev.br_blockcount -= mod;
+ prev.br_startblock += mod;
+ prev.br_startoff = start;
+ }
+ prev.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
+ &prev, firstblock, flist, &logflags,
+ XFS_DATA_FORK, 0);
+ if (error)
+ goto error0;
+ goto nodelete;
+ } else {
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent(ip, lastx, &cur,
+ &del, firstblock, flist, &logflags,
+ XFS_DATA_FORK, 0);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ }
+ if (wasdel) {
+ ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
+ xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
+ (int)del.br_blockcount, rsvd);
+ /* Unreserve our quota space */
+ XFS_TRANS_RESERVE_QUOTA_NBLKS(
+ mp, NULL, ip, -((long)del.br_blockcount), 0,
+ isrt ? XFS_QMOPT_RES_RTBLKS :
+ XFS_QMOPT_RES_REGBLKS);
+ ip->i_delayed_blks -= del.br_blockcount;
+ if (cur)
+ cur->bc_private.b.flags |=
+ XFS_BTCUR_BPRV_WASDEL;
+ } else if (cur)
+ cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
+ /*
+ * If it's the case where the directory code is running
+ * with no block reservation, and the deleted block is in
+ * the middle of its extent, and the resulting insert
+ * of an extent would cause transformation to btree format,
+ * then reject it. The calling code will then swap
+ * blocks around instead.
+ * We have to do this now, rather than waiting for the
+ * conversion to btree format, since the transaction
+ * will be dirty.
+ */
+ if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
+ del.br_startoff > got.br_startoff &&
+ del.br_startoff + del.br_blockcount <
+ got.br_startoff + got.br_blockcount) {
+ error = XFS_ERROR(ENOSPC);
+ goto error0;
+ }
+ error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
+ &tmp_logflags, whichfork, rsvd);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ bno = del.br_startoff - 1;
+nodelete:
+ lastx = ifp->if_lastex;
+ /*
+ * If not done go on to the next (previous) record.
+ * Reset ep in case the extents array was re-alloced.
+ */
+ ep = &ifp->if_u1.if_extents[lastx];
+ if (bno != (xfs_fileoff_t)-1 && bno >= start) {
+ if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
+ xfs_bmbt_get_startoff(ep) > bno) {
+ lastx--;
+ ep--;
+ }
+ if (lastx >= 0)
+ xfs_bmbt_get_all(ep, &got);
+ extno++;
+ }
+ }
+ ifp->if_lastex = lastx;
+ *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ /*
+ * Convert to a btree if necessary.
+ */
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
+ &cur, 0, &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+ /*
+ * transform from btree to extents, give it cur
+ */
+ else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
+ ASSERT(cur != NULL);
+ error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
+ whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+ /*
+ * transform from extents to local?
+ */
+ ASSERT(ifp->if_ext_max ==
+ XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+ error = 0;
+error0:
+ /*
+ * Log everything. Do this after conversion, there's no point in
+ * logging the extent list if we've converted to btree format.
+ */
+ if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ logflags &= ~XFS_ILOG_FEXT(whichfork);
+ else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+ logflags &= ~XFS_ILOG_FBROOT(whichfork);
+ /*
+ * Log inode even in the error case, if the transaction
+ * is dirty we'll need to shut down the filesystem.
+ */
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (cur) {
+ if (!error) {
+ *firstblock = cur->bc_private.b.firstblock;
+ cur->bc_private.b.allocated = 0;
+ }
+ xfs_btree_del_cursor(cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ return error;
+}
+
+/*
+ * Fcntl interface to xfs_bmapi.
+ */
+int /* error code */
+xfs_getbmap(
+ bhv_desc_t *bdp, /* XFS behavior descriptor*/
+ struct getbmap *bmv, /* user bmap structure */
+ void __user *ap, /* pointer to user's array */
+ int interface) /* interface flags */
+{
+ __int64_t bmvend; /* last block requested */
+ int error; /* return value */
+ __int64_t fixlen; /* length for -1 case */
+ int i; /* extent number */
+ xfs_inode_t *ip; /* xfs incore inode pointer */
+ vnode_t *vp; /* corresponding vnode */
+ int lock; /* lock state */
+ xfs_bmbt_irec_t *map; /* buffer for user's data */
+ xfs_mount_t *mp; /* file system mount point */
+ int nex; /* # of user extents can do */
+ int nexleft; /* # of user extents left */
+ int subnex; /* # of bmapi's can do */
+ int nmap; /* number of map entries */
+ struct getbmap out; /* output structure */
+ int whichfork; /* data or attr fork */
+ int prealloced; /* this is a file with
+ * preallocated data space */
+ int sh_unwritten; /* true, if unwritten */
+ /* extents listed separately */
+ int bmapi_flags; /* flags for xfs_bmapi */
+ __int32_t oflags; /* getbmapx bmv_oflags field */
+
+ vp = BHV_TO_VNODE(bdp);
+ ip = XFS_BHVTOI(bdp);
+ mp = ip->i_mount;
+
+ whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
+ sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
+
+ /* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
+ * generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
+ * bit is set for the file, generate a read event in order
+ * that the DMAPI application may do its thing before we return
+ * the extents. Usually this means restoring user file data to
+ * regions of the file that look like holes.
+ *
+ * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
+ * BMV_IF_NO_DMAPI_READ so that read events are generated.
+ * If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
+ * could misinterpret holes in a DMAPI file as true holes,
+ * when in fact they may represent offline user data.
+ */
+ if ( (interface & BMV_IF_NO_DMAPI_READ) == 0
+ && DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)
+ && whichfork == XFS_DATA_FORK) {
+
+ error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
+ if (error)
+ return XFS_ERROR(error);
+ }
+
+ if (whichfork == XFS_ATTR_FORK) {
+ if (XFS_IFORK_Q(ip)) {
+ if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EINVAL);
+ } else if (unlikely(
+ ip->i_d.di_aformat != 0 &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
+ XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ } else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
+ ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EINVAL);
+ if (whichfork == XFS_DATA_FORK) {
+ if (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC) {
+ prealloced = 1;
+ fixlen = XFS_MAXIOFFSET(mp);
+ } else {
+ prealloced = 0;
+ fixlen = ip->i_d.di_size;
+ }
+ } else {
+ prealloced = 0;
+ fixlen = 1LL << 32;
+ }
+
+ if (bmv->bmv_length == -1) {
+ fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
+ bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
+ (__int64_t)0);
+ } else if (bmv->bmv_length < 0)
+ return XFS_ERROR(EINVAL);
+ if (bmv->bmv_length == 0) {
+ bmv->bmv_entries = 0;
+ return 0;
+ }
+ nex = bmv->bmv_count - 1;
+ if (nex <= 0)
+ return XFS_ERROR(EINVAL);
+ bmvend = bmv->bmv_offset + bmv->bmv_length;
+
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+ if (whichfork == XFS_DATA_FORK && ip->i_delayed_blks) {
+ /* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
+ VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
+ }
+
+ ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
+
+ lock = xfs_ilock_map_shared(ip);
+
+ /*
+ * Don't let nex be bigger than the number of extents
+ * we can have assuming alternating holes and real extents.
+ */
+ if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
+ nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
+
+ bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
+ ((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
+
+ /*
+ * Allocate enough space to handle "subnex" maps at a time.
+ */
+ subnex = 16;
+ map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
+
+ bmv->bmv_entries = 0;
+
+ if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
+ error = 0;
+ goto unlock_and_return;
+ }
+
+ nexleft = nex;
+
+ do {
+ nmap = (nexleft > subnex) ? subnex : nexleft;
+ error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
+ XFS_BB_TO_FSB(mp, bmv->bmv_length),
+ bmapi_flags, NULL, 0, map, &nmap, NULL);
+ if (error)
+ goto unlock_and_return;
+ ASSERT(nmap <= subnex);
+
+ for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
+ nexleft--;
+ oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
+ BMV_OF_PREALLOC : 0;
+ out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
+ out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
+ ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
+ if (prealloced &&
+ map[i].br_startblock == HOLESTARTBLOCK &&
+ out.bmv_offset + out.bmv_length == bmvend) {
+ /*
+ * came to hole at end of file
+ */
+ goto unlock_and_return;
+ } else {
+ out.bmv_block =
+ (map[i].br_startblock == HOLESTARTBLOCK) ?
+ -1 :
+ XFS_FSB_TO_DB(ip, map[i].br_startblock);
+
+ /* return either getbmap/getbmapx structure. */
+ if (interface & BMV_IF_EXTENDED) {
+ struct getbmapx outx;
+
+ GETBMAP_CONVERT(out,outx);
+ outx.bmv_oflags = oflags;
+ outx.bmv_unused1 = outx.bmv_unused2 = 0;
+ if (copy_to_user(ap, &outx,
+ sizeof(outx))) {
+ error = XFS_ERROR(EFAULT);
+ goto unlock_and_return;
+ }
+ } else {
+ if (copy_to_user(ap, &out,
+ sizeof(out))) {
+ error = XFS_ERROR(EFAULT);
+ goto unlock_and_return;
+ }
+ }
+ bmv->bmv_offset =
+ out.bmv_offset + out.bmv_length;
+ bmv->bmv_length = MAX((__int64_t)0,
+ (__int64_t)(bmvend - bmv->bmv_offset));
+ bmv->bmv_entries++;
+ ap = (interface & BMV_IF_EXTENDED) ?
+ (void __user *)
+ ((struct getbmapx __user *)ap + 1) :
+ (void __user *)
+ ((struct getbmap __user *)ap + 1);
+ }
+ }
+ } while (nmap && nexleft && bmv->bmv_length);
+
+unlock_and_return:
+ xfs_iunlock_map_shared(ip, lock);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+
+ kmem_free(map, subnex * sizeof(*map));
+
+ return error;
+}
+
+/*
+ * Check the last inode extent to determine whether this allocation will result
+ * in blocks being allocated at the end of the file. When we allocate new data
+ * blocks at the end of the file which do not start at the previous data block,
+ * we will try to align the new blocks at stripe unit boundaries.
+ */
+int /* error */
+xfs_bmap_isaeof(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t off, /* file offset in fsblocks */
+ int whichfork, /* data or attribute fork */
+ char *aeof) /* return value */
+{
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
+ xfs_extnum_t nextents; /* size of extent list */
+ xfs_bmbt_irec_t s; /* expanded extent list entry */
+
+ ASSERT(whichfork == XFS_DATA_FORK);
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(NULL, ip, whichfork)))
+ return error;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ if (nextents == 0) {
+ *aeof = 1;
+ return 0;
+ }
+ /*
+ * Go to the last extent
+ */
+ lastrec = &ifp->if_u1.if_extents[nextents - 1];
+ xfs_bmbt_get_all(lastrec, &s);
+ /*
+ * Check we are allocating in the last extent (for delayed allocations)
+ * or past the last extent for non-delayed allocations.
+ */
+ *aeof = (off >= s.br_startoff &&
+ off < s.br_startoff + s.br_blockcount &&
+ ISNULLSTARTBLOCK(s.br_startblock)) ||
+ off >= s.br_startoff + s.br_blockcount;
+ return 0;
+}
+
+/*
+ * Check if the endoff is outside the last extent. If so the caller will grow
+ * the allocation to a stripe unit boundary.
+ */
+int /* error */
+xfs_bmap_eof(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t endoff, /* file offset in fsblocks */
+ int whichfork, /* data or attribute fork */
+ int *eof) /* result value */
+{
+ xfs_fsblock_t blockcount; /* extent block count */
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
+ xfs_extnum_t nextents; /* size of extent list */
+ xfs_fileoff_t startoff; /* extent starting file offset */
+
+ ASSERT(whichfork == XFS_DATA_FORK);
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(NULL, ip, whichfork)))
+ return error;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ if (nextents == 0) {
+ *eof = 1;
+ return 0;
+ }
+ /*
+ * Go to the last extent
+ */
+ lastrec = &ifp->if_u1.if_extents[nextents - 1];
+ startoff = xfs_bmbt_get_startoff(lastrec);
+ blockcount = xfs_bmbt_get_blockcount(lastrec);
+ *eof = endoff >= startoff + blockcount;
+ return 0;
+}
+
+#ifdef DEBUG
+/*
+ * Check that the extents list for the inode ip is in the right order.
+ */
+STATIC void
+xfs_bmap_check_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_t *base; /* base of extents list */
+ xfs_bmbt_rec_t *ep; /* current extent entry */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t nextents; /* number of extents in list */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ base = ifp->if_u1.if_extents;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ for (ep = base; ep < &base[nextents - 1]; ep++) {
+ xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
+ (void *)(ep + 1));
+ }
+}
+
+STATIC
+xfs_buf_t *
+xfs_bmap_get_bp(
+ xfs_btree_cur_t *cur,
+ xfs_fsblock_t bno)
+{
+ int i;
+ xfs_buf_t *bp;
+
+ if (!cur)
+ return(NULL);
+
+ bp = NULL;
+ for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
+ bp = cur->bc_bufs[i];
+ if (!bp) break;
+ if (XFS_BUF_ADDR(bp) == bno)
+ break; /* Found it */
+ }
+ if (i == XFS_BTREE_MAXLEVELS)
+ bp = NULL;
+
+ if (!bp) { /* Chase down all the log items to see if the bp is there */
+ xfs_log_item_chunk_t *licp;
+ xfs_trans_t *tp;
+
+ tp = cur->bc_tp;
+ licp = &tp->t_items;
+ while (!bp && licp != NULL) {
+ if (XFS_LIC_ARE_ALL_FREE(licp)) {
+ licp = licp->lic_next;
+ continue;
+ }
+ for (i = 0; i < licp->lic_unused; i++) {
+ xfs_log_item_desc_t *lidp;
+ xfs_log_item_t *lip;
+ xfs_buf_log_item_t *bip;
+ xfs_buf_t *lbp;
+
+ if (XFS_LIC_ISFREE(licp, i)) {
+ continue;
+ }
+
+ lidp = XFS_LIC_SLOT(licp, i);
+ lip = lidp->lid_item;
+ if (lip->li_type != XFS_LI_BUF)
+ continue;
+
+ bip = (xfs_buf_log_item_t *)lip;
+ lbp = bip->bli_buf;
+
+ if (XFS_BUF_ADDR(lbp) == bno) {
+ bp = lbp;
+ break; /* Found it */
+ }
+ }
+ licp = licp->lic_next;
+ }
+ }
+ return(bp);
+}
+
+void
+xfs_check_block(
+ xfs_bmbt_block_t *block,
+ xfs_mount_t *mp,
+ int root,
+ short sz)
+{
+ int i, j, dmxr;
+ xfs_bmbt_ptr_t *pp, *thispa; /* pointer to block address */
+ xfs_bmbt_key_t *prevp, *keyp;
+
+ ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+
+ prevp = NULL;
+ for( i = 1; i <= INT_GET(block->bb_numrecs, ARCH_CONVERT);i++) {
+ dmxr = mp->m_bmap_dmxr[0];
+
+ if (root) {
+ keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
+ } else {
+ keyp = XFS_BTREE_KEY_ADDR(mp->m_sb.sb_blocksize,
+ xfs_bmbt, block, i, dmxr);
+ }
+
+ if (prevp) {
+ xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
+ }
+ prevp = keyp;
+
+ /*
+ * Compare the block numbers to see if there are dups.
+ */
+
+ if (root) {
+ pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
+ } else {
+ pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+ xfs_bmbt, block, i, dmxr);
+ }
+ for (j = i+1; j <= INT_GET(block->bb_numrecs, ARCH_CONVERT); j++) {
+ if (root) {
+ thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
+ } else {
+ thispa = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+ xfs_bmbt, block, j, dmxr);
+ }
+ if (INT_GET(*thispa, ARCH_CONVERT) ==
+ INT_GET(*pp, ARCH_CONVERT)) {
+ cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
+ __FUNCTION__, j, i,
+ INT_GET(*thispa, ARCH_CONVERT));
+ panic("%s: ptrs are equal in node\n",
+ __FUNCTION__);
+ }
+ }
+ }
+}
+
+/*
+ * Check that the extents for the inode ip are in the right order in all
+ * btree leaves.
+ */
+
+STATIC void
+xfs_bmap_check_leaf_extents(
+ xfs_btree_cur_t *cur, /* btree cursor or null */
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_block_t *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_buf_t *bp; /* buffer for "block" */
+ int error; /* error return value */
+ xfs_extnum_t i=0; /* index into the extents list */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ xfs_bmbt_ptr_t *pp; /* pointer to block address */
+ xfs_bmbt_rec_t *ep, *lastp; /* extent pointers in block entry */
+ int bp_release = 0;
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
+ return;
+ }
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ block = ifp->if_broot;
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+ level = INT_GET(block->bb_level, ARCH_CONVERT);
+ xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+ ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+ /*
+ * Go down the tree until leaf level is reached, following the first
+ * pointer (leftmost) at each level.
+ */
+ while (level-- > 0) {
+ /* See if buf is in cur first */
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (bp) {
+ bp_release = 0;
+ } else {
+ bp_release = 1;
+ }
+ if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ goto error_norelse;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+ XFS_WANT_CORRUPTED_GOTO(
+ XFS_BMAP_SANITY_CHECK(mp, block, level),
+ error0);
+ if (level == 0)
+ break;
+
+ /*
+ * Check this block for basic sanity (increasing keys and
+ * no duplicate blocks).
+ */
+
+ xfs_check_block(block, mp, 0, 0);
+ pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
+ 1, mp->m_bmap_dmxr[1]);
+ XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)), error0);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ }
+
+ /*
+ * Here with bp and block set to the leftmost leaf node in the tree.
+ */
+ i = 0;
+
+ /*
+ * Loop over all leaf nodes checking that all extents are in the right order.
+ */
+ lastp = NULL;
+ for (;;) {
+ xfs_bmbt_rec_t *frp;
+ xfs_fsblock_t nextbno;
+ xfs_extnum_t num_recs;
+
+
+ num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+
+ /*
+ * Read-ahead the next leaf block, if any.
+ */
+
+ nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+
+ /*
+ * Check all the extents to make sure they are OK.
+ * If we had a previous block, the last entry should
+ * conform with the first entry in this one.
+ */
+
+ frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
+ block, 1, mp->m_bmap_dmxr[0]);
+
+ for (ep = frp;ep < frp + (num_recs - 1); ep++) {
+ if (lastp) {
+ xfs_btree_check_rec(XFS_BTNUM_BMAP,
+ (void *)lastp, (void *)ep);
+ }
+ xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
+ (void *)(ep + 1));
+ }
+ lastp = frp + num_recs - 1; /* For the next iteration */
+
+ i += num_recs;
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ bno = nextbno;
+ /*
+ * If we've reached the end, stop.
+ */
+ if (bno == NULLFSBLOCK)
+ break;
+
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (bp) {
+ bp_release = 0;
+ } else {
+ bp_release = 1;
+ }
+ if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ goto error_norelse;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+ }
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ return;
+
+error0:
+ cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
+ if (bp_release)
+ xfs_trans_brelse(NULL, bp);
+error_norelse:
+ cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
+ i, __FUNCTION__);
+ panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
+ return;
+}
+#endif
+
+/*
+ * Count fsblocks of the given fork.
+ */
+int /* error */
+xfs_bmap_count_blocks(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork, /* data or attr fork */
+ int *count) /* out: count of blocks */
+{
+ xfs_bmbt_block_t *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ xfs_bmbt_ptr_t *pp; /* pointer to block address */
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
+ if (unlikely(xfs_bmap_count_leaves(ifp->if_u1.if_extents,
+ ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
+ count) < 0)) {
+ XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ return 0;
+ }
+
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ block = ifp->if_broot;
+ ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+ level = INT_GET(block->bb_level, ARCH_CONVERT);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+ ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+
+ if (unlikely(xfs_bmap_count_tree(mp, tp, bno, level, count) < 0)) {
+ XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
+ mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ return 0;
+}
+
+/*
+ * Recursively walks each level of a btree
+ * to count total fsblocks is use.
+ */
+int /* error */
+xfs_bmap_count_tree(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_fsblock_t blockno, /* file system block number */
+ int levelin, /* level in btree */
+ int *count) /* Count of blocks */
+{
+ int error;
+ xfs_buf_t *bp, *nbp;
+ int level = levelin;
+ xfs_bmbt_ptr_t *pp;
+ xfs_fsblock_t bno = blockno;
+ xfs_fsblock_t nextbno;
+ xfs_bmbt_block_t *block, *nextblock;
+ int numrecs;
+ xfs_bmbt_rec_t *frp;
+
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+
+ if (--level) {
+ /* Not at node above leafs, count this level of nodes */
+ nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+ while (nextbno != NULLFSBLOCK) {
+ if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
+ 0, &nbp, XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
+ nextbno = INT_GET(nextblock->bb_rightsib, ARCH_CONVERT);
+ xfs_trans_brelse(tp, nbp);
+ }
+
+ /* Dive to the next level */
+ pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+ xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
+ bno = INT_GET(*pp, ARCH_CONVERT);
+ if (unlikely((error =
+ xfs_bmap_count_tree(mp, tp, bno, level, count)) < 0)) {
+ xfs_trans_brelse(tp, bp);
+ XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ xfs_trans_brelse(tp, bp);
+ } else {
+ /* count all level 1 nodes and their leaves */
+ for (;;) {
+ nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+ numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+ frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize,
+ xfs_bmbt, block, 1, mp->m_bmap_dmxr[0]);
+ if (unlikely(xfs_bmap_count_leaves(frp, numrecs, count) < 0)) {
+ xfs_trans_brelse(tp, bp);
+ XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ xfs_trans_brelse(tp, bp);
+ if (nextbno == NULLFSBLOCK)
+ break;
+ bno = nextbno;
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ block = XFS_BUF_TO_BMBT_BLOCK(bp);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Count leaf blocks given a pointer to an extent list.
+ */
+int
+xfs_bmap_count_leaves(
+ xfs_bmbt_rec_t *frp,
+ int numrecs,
+ int *count)
+{
+ int b;
+
+ for ( b = 1; b <= numrecs; b++, frp++)
+ *count += xfs_bmbt_disk_get_blockcount(frp);
+ return 0;
+}
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