diff options
Diffstat (limited to 'fs/xfs/xfs_attr_leaf.c')
| -rw-r--r-- | fs/xfs/xfs_attr_leaf.c | 3050 |
1 files changed, 3050 insertions, 0 deletions
diff --git a/fs/xfs/xfs_attr_leaf.c b/fs/xfs/xfs_attr_leaf.c new file mode 100644 index 0000000..b11256e --- /dev/null +++ b/fs/xfs/xfs_attr_leaf.c @@ -0,0 +1,3050 @@ +/* + * Copyright (c) 2000-2003 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/ + */ +/* + * xfs_attr_leaf.c + * + * GROT: figure out how to recover gracefully when bmap returns ENOSPC. + */ + +#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_alloc.h" +#include "xfs_btree.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_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_attr.h" +#include "xfs_attr_leaf.h" +#include "xfs_error.h" +#include "xfs_bit.h" + +/* + * xfs_attr_leaf.c + * + * Routines to implement leaf blocks of attributes as Btrees of hashed names. + */ + +/*======================================================================== + * Function prototypes for the kernel. + *========================================================================*/ + +/* + * Routines used for growing the Btree. + */ +STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args, + int freemap_index); +STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer); +STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state, + xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2); +STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state, + xfs_da_state_blk_t *leaf_blk_1, + xfs_da_state_blk_t *leaf_blk_2, + int *number_entries_in_blk1, + int *number_usedbytes_in_blk1); + +/* + * Utility routines. + */ +STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf, + int src_start, + xfs_attr_leafblock_t *dst_leaf, + int dst_start, int move_count, + xfs_mount_t *mp); + + +/*======================================================================== + * External routines when dirsize < XFS_LITINO(mp). + *========================================================================*/ + +/* + * Create the initial contents of a shortform attribute list. + */ +int +xfs_attr_shortform_create(xfs_da_args_t *args) +{ + xfs_attr_sf_hdr_t *hdr; + xfs_inode_t *dp; + xfs_ifork_t *ifp; + + dp = args->dp; + ASSERT(dp != NULL); + ifp = dp->i_afp; + ASSERT(ifp != NULL); + ASSERT(ifp->if_bytes == 0); + if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) { + ifp->if_flags &= ~XFS_IFEXTENTS; /* just in case */ + dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL; + ifp->if_flags |= XFS_IFINLINE; + } else { + ASSERT(ifp->if_flags & XFS_IFINLINE); + } + xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK); + hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data; + hdr->count = 0; + INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr)); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); + return(0); +} + +/* + * Add a name/value pair to the shortform attribute list. + * Overflow from the inode has already been checked for. + */ +int +xfs_attr_shortform_add(xfs_da_args_t *args) +{ + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + int i, offset, size; + xfs_inode_t *dp; + xfs_ifork_t *ifp; + + dp = args->dp; + ifp = dp->i_afp; + ASSERT(ifp->if_flags & XFS_IFINLINE); + sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); + sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { + if (sfe->namelen != args->namelen) + continue; + if (memcmp(args->name, sfe->nameval, args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0)) + continue; + return(XFS_ERROR(EEXIST)); + } + + offset = (char *)sfe - (char *)sf; + size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen); + xfs_idata_realloc(dp, size, XFS_ATTR_FORK); + sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; + sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset); + + sfe->namelen = args->namelen; + INT_SET(sfe->valuelen, ARCH_CONVERT, args->valuelen); + sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : + ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); + memcpy(sfe->nameval, args->name, args->namelen); + memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen); + INT_MOD(sf->hdr.count, ARCH_CONVERT, 1); + INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); + + return(0); +} + +/* + * Remove a name from the shortform attribute list structure. + */ +int +xfs_attr_shortform_remove(xfs_da_args_t *args) +{ + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + int base, size=0, end, totsize, i; + xfs_inode_t *dp; + + /* + * Remove the attribute. + */ + dp = args->dp; + base = sizeof(xfs_attr_sf_hdr_t); + sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data; + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); + sfe = XFS_ATTR_SF_NEXTENTRY(sfe), + base += size, i++) { + size = XFS_ATTR_SF_ENTSIZE(sfe); + if (sfe->namelen != args->namelen) + continue; + if (memcmp(sfe->nameval, args->name, args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0)) + continue; + break; + } + if (i == INT_GET(sf->hdr.count, ARCH_CONVERT)) + return(XFS_ERROR(ENOATTR)); + + end = base + size; + totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT); + if (end != totsize) { + memmove(&((char *)sf)[base], &((char *)sf)[end], + totsize - end); + } + INT_MOD(sf->hdr.count, ARCH_CONVERT, -1); + INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size); + xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA); + + return(0); +} + +/* + * Look up a name in a shortform attribute list structure. + */ +/*ARGSUSED*/ +int +xfs_attr_shortform_lookup(xfs_da_args_t *args) +{ + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + int i; + xfs_ifork_t *ifp; + + ifp = args->dp->i_afp; + ASSERT(ifp->if_flags & XFS_IFINLINE); + sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); + sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { + if (sfe->namelen != args->namelen) + continue; + if (memcmp(args->name, sfe->nameval, args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0)) + continue; + return(XFS_ERROR(EEXIST)); + } + return(XFS_ERROR(ENOATTR)); +} + +/* + * Look up a name in a shortform attribute list structure. + */ +/*ARGSUSED*/ +int +xfs_attr_shortform_getvalue(xfs_da_args_t *args) +{ + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + int i; + + ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE); + sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data; + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); + sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) { + if (sfe->namelen != args->namelen) + continue; + if (memcmp(args->name, sfe->nameval, args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0)) + continue; + if (args->flags & ATTR_KERNOVAL) { + args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); + return(XFS_ERROR(EEXIST)); + } + if (args->valuelen < INT_GET(sfe->valuelen, ARCH_CONVERT)) { + args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); + return(XFS_ERROR(ERANGE)); + } + args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); + memcpy(args->value, &sfe->nameval[args->namelen], + args->valuelen); + return(XFS_ERROR(EEXIST)); + } + return(XFS_ERROR(ENOATTR)); +} + +/* + * Convert from using the shortform to the leaf. + */ +int +xfs_attr_shortform_to_leaf(xfs_da_args_t *args) +{ + xfs_inode_t *dp; + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + xfs_da_args_t nargs; + char *tmpbuffer; + int error, i, size; + xfs_dablk_t blkno; + xfs_dabuf_t *bp; + xfs_ifork_t *ifp; + + dp = args->dp; + ifp = dp->i_afp; + sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data; + size = INT_GET(sf->hdr.totsize, ARCH_CONVERT); + tmpbuffer = kmem_alloc(size, KM_SLEEP); + ASSERT(tmpbuffer != NULL); + memcpy(tmpbuffer, ifp->if_u1.if_data, size); + sf = (xfs_attr_shortform_t *)tmpbuffer; + + xfs_idata_realloc(dp, -size, XFS_ATTR_FORK); + bp = NULL; + error = xfs_da_grow_inode(args, &blkno); + if (error) { + /* + * If we hit an IO error middle of the transaction inside + * grow_inode(), we may have inconsistent data. Bail out. + */ + if (error == EIO) + goto out; + xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */ + memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */ + goto out; + } + + ASSERT(blkno == 0); + error = xfs_attr_leaf_create(args, blkno, &bp); + if (error) { + error = xfs_da_shrink_inode(args, 0, bp); + bp = NULL; + if (error) + goto out; + xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */ + memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */ + goto out; + } + + memset((char *)&nargs, 0, sizeof(nargs)); + nargs.dp = dp; + nargs.firstblock = args->firstblock; + nargs.flist = args->flist; + nargs.total = args->total; + nargs.whichfork = XFS_ATTR_FORK; + nargs.trans = args->trans; + nargs.oknoent = 1; + + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { + nargs.name = (char *)sfe->nameval; + nargs.namelen = sfe->namelen; + nargs.value = (char *)&sfe->nameval[nargs.namelen]; + nargs.valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT); + nargs.hashval = xfs_da_hashname((char *)sfe->nameval, + sfe->namelen); + nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : + ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); + error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */ + ASSERT(error == ENOATTR); + error = xfs_attr_leaf_add(bp, &nargs); + ASSERT(error != ENOSPC); + if (error) + goto out; + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + } + error = 0; + +out: + if(bp) + xfs_da_buf_done(bp); + kmem_free(tmpbuffer, size); + return(error); +} + +STATIC int +xfs_attr_shortform_compare(const void *a, const void *b) +{ + xfs_attr_sf_sort_t *sa, *sb; + + sa = (xfs_attr_sf_sort_t *)a; + sb = (xfs_attr_sf_sort_t *)b; + if (INT_GET(sa->hash, ARCH_CONVERT) + < INT_GET(sb->hash, ARCH_CONVERT)) { + return(-1); + } else if (INT_GET(sa->hash, ARCH_CONVERT) + > INT_GET(sb->hash, ARCH_CONVERT)) { + return(1); + } else { + return(sa->entno - sb->entno); + } +} + +/* + * Copy out entries of shortform attribute lists for attr_list(). + * Shortform atrtribute lists are not stored in hashval sorted order. + * If the output buffer is not large enough to hold them all, then we + * we have to calculate each entries' hashvalue and sort them before + * we can begin returning them to the user. + */ +/*ARGSUSED*/ +int +xfs_attr_shortform_list(xfs_attr_list_context_t *context) +{ + attrlist_cursor_kern_t *cursor; + xfs_attr_sf_sort_t *sbuf, *sbp; + xfs_attr_shortform_t *sf; + xfs_attr_sf_entry_t *sfe; + xfs_inode_t *dp; + int sbsize, nsbuf, count, i; + + ASSERT(context != NULL); + dp = context->dp; + ASSERT(dp != NULL); + ASSERT(dp->i_afp != NULL); + sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data; + ASSERT(sf != NULL); + if (!sf->hdr.count) + return(0); + cursor = context->cursor; + ASSERT(cursor != NULL); + + xfs_attr_trace_l_c("sf start", context); + + /* + * If the buffer is large enough, do not bother with sorting. + * Note the generous fudge factor of 16 overhead bytes per entry. + */ + if ((dp->i_afp->if_bytes + INT_GET(sf->hdr.count, ARCH_CONVERT) * 16) + < context->bufsize) { + for (i = 0, sfe = &sf->list[0]; + i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { + attrnames_t *namesp; + + if (((context->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0) && + !(context->flags & ATTR_KERNORMALS)) { + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + continue; + } + if (((context->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0) && + !(context->flags & ATTR_KERNROOTLS)) { + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + continue; + } + namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure: + ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted : + &attr_user); + if (context->flags & ATTR_KERNOVAL) { + ASSERT(context->flags & ATTR_KERNAMELS); + context->count += namesp->attr_namelen + + INT_GET(sfe->namelen, ARCH_CONVERT) + 1; + } + else { + if (xfs_attr_put_listent(context, namesp, + (char *)sfe->nameval, + (int)sfe->namelen, + (int)INT_GET(sfe->valuelen, + ARCH_CONVERT))) + break; + } + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + } + xfs_attr_trace_l_c("sf big-gulp", context); + return(0); + } + + /* + * It didn't all fit, so we have to sort everything on hashval. + */ + sbsize = INT_GET(sf->hdr.count, ARCH_CONVERT) * sizeof(*sbuf); + sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP); + + /* + * Scan the attribute list for the rest of the entries, storing + * the relevant info from only those that match into a buffer. + */ + nsbuf = 0; + for (i = 0, sfe = &sf->list[0]; + i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { + if (unlikely( + ((char *)sfe < (char *)sf) || + ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) { + XFS_CORRUPTION_ERROR("xfs_attr_shortform_list", + XFS_ERRLEVEL_LOW, + context->dp->i_mount, sfe); + xfs_attr_trace_l_c("sf corrupted", context); + kmem_free(sbuf, sbsize); + return XFS_ERROR(EFSCORRUPTED); + } + if (((context->flags & ATTR_SECURE) != 0) != + ((sfe->flags & XFS_ATTR_SECURE) != 0) && + !(context->flags & ATTR_KERNORMALS)) { + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + continue; + } + if (((context->flags & ATTR_ROOT) != 0) != + ((sfe->flags & XFS_ATTR_ROOT) != 0) && + !(context->flags & ATTR_KERNROOTLS)) { + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + continue; + } + sbp->entno = i; + INT_SET(sbp->hash, ARCH_CONVERT, + xfs_da_hashname((char *)sfe->nameval, sfe->namelen)); + sbp->name = (char *)sfe->nameval; + sbp->namelen = sfe->namelen; + /* These are bytes, and both on-disk, don't endian-flip */ + sbp->valuelen = sfe->valuelen; + sbp->flags = sfe->flags; + sfe = XFS_ATTR_SF_NEXTENTRY(sfe); + sbp++; + nsbuf++; + } + + /* + * Sort the entries on hash then entno. + */ + qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare); + + /* + * Re-find our place IN THE SORTED LIST. + */ + count = 0; + cursor->initted = 1; + cursor->blkno = 0; + for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) { + if (INT_GET(sbp->hash, ARCH_CONVERT) == cursor->hashval) { + if (cursor->offset == count) { + break; + } + count++; + } else if (INT_GET(sbp->hash, ARCH_CONVERT) > cursor->hashval) { + break; + } + } + if (i == nsbuf) { + kmem_free(sbuf, sbsize); + xfs_attr_trace_l_c("blk end", context); + return(0); + } + + /* + * Loop putting entries into the user buffer. + */ + for ( ; i < nsbuf; i++, sbp++) { + attrnames_t *namesp; + + namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure : + ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted : + &attr_user); + + if (cursor->hashval != INT_GET(sbp->hash, ARCH_CONVERT)) { + cursor->hashval = INT_GET(sbp->hash, ARCH_CONVERT); + cursor->offset = 0; + } + if (context->flags & ATTR_KERNOVAL) { + ASSERT(context->flags & ATTR_KERNAMELS); + context->count += namesp->attr_namelen + + sbp->namelen + 1; + } else { + if (xfs_attr_put_listent(context, namesp, + sbp->name, sbp->namelen, + INT_GET(sbp->valuelen, ARCH_CONVERT))) + break; + } + cursor->offset++; + } + + kmem_free(sbuf, sbsize); + xfs_attr_trace_l_c("sf E-O-F", context); + return(0); +} + +/* + * Check a leaf attribute block to see if all the entries would fit into + * a shortform attribute list. + */ +int +xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + int bytes, i; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + + entry = &leaf->entries[0]; + bytes = sizeof(struct xfs_attr_sf_hdr); + for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { + if (entry->flags & XFS_ATTR_INCOMPLETE) + continue; /* don't copy partial entries */ + if (!(entry->flags & XFS_ATTR_LOCAL)) + return(0); + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); + if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX) + return(0); + if (INT_GET(name_loc->valuelen, ARCH_CONVERT) >= XFS_ATTR_SF_ENTSIZE_MAX) + return(0); + bytes += sizeof(struct xfs_attr_sf_entry)-1 + + name_loc->namelen + + INT_GET(name_loc->valuelen, ARCH_CONVERT); + } + return( bytes < XFS_IFORK_ASIZE(dp) ); +} + +/* + * Convert a leaf attribute list to shortform attribute list + */ +int +xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + xfs_da_args_t nargs; + xfs_inode_t *dp; + char *tmpbuffer; + int error, i; + + dp = args->dp; + tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP); + ASSERT(tmpbuffer != NULL); + + ASSERT(bp != NULL); + memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount)); + leaf = (xfs_attr_leafblock_t *)tmpbuffer; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + memset(bp->data, 0, XFS_LBSIZE(dp->i_mount)); + + /* + * Clean out the prior contents of the attribute list. + */ + error = xfs_da_shrink_inode(args, 0, bp); + if (error) + goto out; + error = xfs_attr_shortform_create(args); + if (error) + goto out; + + /* + * Copy the attributes + */ + memset((char *)&nargs, 0, sizeof(nargs)); + nargs.dp = dp; + nargs.firstblock = args->firstblock; + nargs.flist = args->flist; + nargs.total = args->total; + nargs.whichfork = XFS_ATTR_FORK; + nargs.trans = args->trans; + nargs.oknoent = 1; + entry = &leaf->entries[0]; + for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { + if (entry->flags & XFS_ATTR_INCOMPLETE) + continue; /* don't copy partial entries */ + if (!entry->nameidx) + continue; + ASSERT(entry->flags & XFS_ATTR_LOCAL); + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); + nargs.name = (char *)name_loc->nameval; + nargs.namelen = name_loc->namelen; + nargs.value = (char *)&name_loc->nameval[nargs.namelen]; + nargs.valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT); + nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT); + nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : + ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); + xfs_attr_shortform_add(&nargs); + } + error = 0; + +out: + kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount)); + return(error); +} + +/* + * Convert from using a single leaf to a root node and a leaf. + */ +int +xfs_attr_leaf_to_node(xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_da_intnode_t *node; + xfs_inode_t *dp; + xfs_dabuf_t *bp1, *bp2; + xfs_dablk_t blkno; + int error; + + dp = args->dp; + bp1 = bp2 = NULL; + error = xfs_da_grow_inode(args, &blkno); + if (error) + goto out; + error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1, + XFS_ATTR_FORK); + if (error) + goto out; + ASSERT(bp1 != NULL); + bp2 = NULL; + error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2, + XFS_ATTR_FORK); + if (error) + goto out; + ASSERT(bp2 != NULL); + memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount)); + xfs_da_buf_done(bp1); + bp1 = NULL; + xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1); + + /* + * Set up the new root node. + */ + error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK); + if (error) + goto out; + node = bp1->data; + leaf = bp2->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + /* both on-disk, don't endian-flip twice */ + node->btree[0].hashval = + leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval; + INT_SET(node->btree[0].before, ARCH_CONVERT, blkno); + INT_SET(node->hdr.count, ARCH_CONVERT, 1); + xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1); + error = 0; +out: + if (bp1) + xfs_da_buf_done(bp1); + if (bp2) + xfs_da_buf_done(bp2); + return(error); +} + + +/*======================================================================== + * Routines used for growing the Btree. + *========================================================================*/ + +/* + * Create the initial contents of a leaf attribute list + * or a leaf in a node attribute list. + */ +int +xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_hdr_t *hdr; + xfs_inode_t *dp; + xfs_dabuf_t *bp; + int error; + + dp = args->dp; + ASSERT(dp != NULL); + error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp, + XFS_ATTR_FORK); + if (error) + return(error); + ASSERT(bp != NULL); + leaf = bp->data; + memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount)); + hdr = &leaf->hdr; + INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_ATTR_LEAF_MAGIC); + INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount)); + if (!hdr->firstused) { + INT_SET(hdr->firstused, ARCH_CONVERT, + XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN); + } + + INT_SET(hdr->freemap[0].base, ARCH_CONVERT, + sizeof(xfs_attr_leaf_hdr_t)); + INT_SET(hdr->freemap[0].size, ARCH_CONVERT, + INT_GET(hdr->firstused, ARCH_CONVERT) + - INT_GET(hdr->freemap[0].base, + ARCH_CONVERT)); + + xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1); + + *bpp = bp; + return(0); +} + +/* + * Split the leaf node, rebalance, then add the new entry. + */ +int +xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, + xfs_da_state_blk_t *newblk) +{ + xfs_dablk_t blkno; + int error; + + /* + * Allocate space for a new leaf node. + */ + ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC); + error = xfs_da_grow_inode(state->args, &blkno); + if (error) + return(error); + error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp); + if (error) + return(error); + newblk->blkno = blkno; + newblk->magic = XFS_ATTR_LEAF_MAGIC; + + /* + * Rebalance the entries across the two leaves. + * NOTE: rebalance() currently depends on the 2nd block being empty. + */ + xfs_attr_leaf_rebalance(state, oldblk, newblk); + error = xfs_da_blk_link(state, oldblk, newblk); + if (error) + return(error); + + /* + * Save info on "old" attribute for "atomic rename" ops, leaf_add() + * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the + * "new" attrs info. Will need the "old" info to remove it later. + * + * Insert the "new" entry in the correct block. + */ + if (state->inleaf) + error = xfs_attr_leaf_add(oldblk->bp, state->args); + else + error = xfs_attr_leaf_add(newblk->bp, state->args); + + /* + * Update last hashval in each block since we added the name. + */ + oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL); + newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL); + return(error); +} + +/* + * Add a name to the leaf attribute list structure. + */ +int +xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_hdr_t *hdr; + xfs_attr_leaf_map_t *map; + int tablesize, entsize, sum, tmp, i; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT((args->index >= 0) + && (args->index <= INT_GET(leaf->hdr.count, ARCH_CONVERT))); + hdr = &leaf->hdr; + entsize = xfs_attr_leaf_newentsize(args, + args->trans->t_mountp->m_sb.sb_blocksize, NULL); + + /* + * Search through freemap for first-fit on new name length. + * (may need to figure in size of entry struct too) + */ + tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) + * sizeof(xfs_attr_leaf_entry_t) + + sizeof(xfs_attr_leaf_hdr_t); + map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1]; + for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) { + if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) { + sum += INT_GET(map->size, ARCH_CONVERT); + continue; + } + if (!map->size) + continue; /* no space in this map */ + tmp = entsize; + if (INT_GET(map->base, ARCH_CONVERT) + < INT_GET(hdr->firstused, ARCH_CONVERT)) + tmp += sizeof(xfs_attr_leaf_entry_t); + if (INT_GET(map->size, ARCH_CONVERT) >= tmp) { + tmp = xfs_attr_leaf_add_work(bp, args, i); + return(tmp); + } + sum += INT_GET(map->size, ARCH_CONVERT); + } + + /* + * If there are no holes in the address space of the block, + * and we don't have enough freespace, then compaction will do us + * no good and we should just give up. + */ + if (!hdr->holes && (sum < entsize)) + return(XFS_ERROR(ENOSPC)); + + /* + * Compact the entries to coalesce free space. + * This may change the hdr->count via dropping INCOMPLETE entries. + */ + xfs_attr_leaf_compact(args->trans, bp); + + /* + * After compaction, the block is guaranteed to have only one + * free region, in freemap[0]. If it is not big enough, give up. + */ + if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) + < (entsize + sizeof(xfs_attr_leaf_entry_t))) + return(XFS_ERROR(ENOSPC)); + + return(xfs_attr_leaf_add_work(bp, args, 0)); +} + +/* + * Add a name to a leaf attribute list structure. + */ +STATIC int +xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_hdr_t *hdr; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + xfs_attr_leaf_name_remote_t *name_rmt; + xfs_attr_leaf_map_t *map; + xfs_mount_t *mp; + int tmp, i; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + hdr = &leaf->hdr; + ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE)); + ASSERT((args->index >= 0) + && (args->index <= INT_GET(hdr->count, ARCH_CONVERT))); + + /* + * Force open some space in the entry array and fill it in. + */ + entry = &leaf->entries[args->index]; + if (args->index < INT_GET(hdr->count, ARCH_CONVERT)) { + tmp = INT_GET(hdr->count, ARCH_CONVERT) - args->index; + tmp *= sizeof(xfs_attr_leaf_entry_t); + memmove((char *)(entry+1), (char *)entry, tmp); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry))); + } + INT_MOD(hdr->count, ARCH_CONVERT, 1); + + /* + * Allocate space for the new string (at the end of the run). + */ + map = &hdr->freemap[mapindex]; + mp = args->trans->t_mountp; + ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp)); + ASSERT((INT_GET(map->base, ARCH_CONVERT) & 0x3) == 0); + ASSERT(INT_GET(map->size, ARCH_CONVERT) + >= xfs_attr_leaf_newentsize(args, + mp->m_sb.sb_blocksize, NULL)); + ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp)); + ASSERT((INT_GET(map->size, ARCH_CONVERT) & 0x3) == 0); + INT_MOD(map->size, ARCH_CONVERT, + -xfs_attr_leaf_newentsize(args, mp->m_sb.sb_blocksize, &tmp)); + INT_SET(entry->nameidx, ARCH_CONVERT, + INT_GET(map->base, ARCH_CONVERT) + + INT_GET(map->size, ARCH_CONVERT)); + INT_SET(entry->hashval, ARCH_CONVERT, args->hashval); + entry->flags = tmp ? XFS_ATTR_LOCAL : 0; + entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : + ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); + if (args->rename) { + entry->flags |= XFS_ATTR_INCOMPLETE; + if ((args->blkno2 == args->blkno) && + (args->index2 <= args->index)) { + args->index2++; + } + } + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); + ASSERT((args->index == 0) || (INT_GET(entry->hashval, ARCH_CONVERT) + >= INT_GET((entry-1)->hashval, + ARCH_CONVERT))); + ASSERT((args->index == INT_GET(hdr->count, ARCH_CONVERT)-1) || + (INT_GET(entry->hashval, ARCH_CONVERT) + <= (INT_GET((entry+1)->hashval, ARCH_CONVERT)))); + + /* + * Copy the attribute name and value into the new space. + * + * For "remote" attribute values, simply note that we need to + * allocate space for the "remote" value. We can't actually + * allocate the extents in this transaction, and we can't decide + * which blocks they should be as we might allocate more blocks + * as part of this transaction (a split operation for example). + */ + if (entry->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); + name_loc->namelen = args->namelen; + INT_SET(name_loc->valuelen, ARCH_CONVERT, args->valuelen); + memcpy((char *)name_loc->nameval, args->name, args->namelen); + memcpy((char *)&name_loc->nameval[args->namelen], args->value, + INT_GET(name_loc->valuelen, ARCH_CONVERT)); + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); + name_rmt->namelen = args->namelen; + memcpy((char *)name_rmt->name, args->name, args->namelen); + entry->flags |= XFS_ATTR_INCOMPLETE; + /* just in case */ + name_rmt->valuelen = 0; + name_rmt->valueblk = 0; + args->rmtblkno = 1; + args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen); + } + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index), + xfs_attr_leaf_entsize(leaf, args->index))); + + /* + * Update the control info for this leaf node + */ + if (INT_GET(entry->nameidx, ARCH_CONVERT) + < INT_GET(hdr->firstused, ARCH_CONVERT)) { + /* both on-disk, don't endian-flip twice */ + hdr->firstused = entry->nameidx; + } + ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) + >= ((INT_GET(hdr->count, ARCH_CONVERT) + * sizeof(*entry))+sizeof(*hdr))); + tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) + * sizeof(xfs_attr_leaf_entry_t) + + sizeof(xfs_attr_leaf_hdr_t); + map = &hdr->freemap[0]; + for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) { + if (INT_GET(map->base, ARCH_CONVERT) == tmp) { + INT_MOD(map->base, ARCH_CONVERT, + sizeof(xfs_attr_leaf_entry_t)); + INT_MOD(map->size, ARCH_CONVERT, + -sizeof(xfs_attr_leaf_entry_t)); + } + } + INT_MOD(hdr->usedbytes, ARCH_CONVERT, + xfs_attr_leaf_entsize(leaf, args->index)); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr))); + return(0); +} + +/* + * Garbage collect a leaf attribute list block by copying it to a new buffer. + */ +STATIC void +xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp) +{ + xfs_attr_leafblock_t *leaf_s, *leaf_d; + xfs_attr_leaf_hdr_t *hdr_s, *hdr_d; + xfs_mount_t *mp; + char *tmpbuffer; + + mp = trans->t_mountp; + tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP); + ASSERT(tmpbuffer != NULL); + memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp)); + memset(bp->data, 0, XFS_LBSIZE(mp)); + + /* + * Copy basic information + */ + leaf_s = (xfs_attr_leafblock_t *)tmpbuffer; + leaf_d = bp->data; + hdr_s = &leaf_s->hdr; + hdr_d = &leaf_d->hdr; + hdr_d->info = hdr_s->info; /* struct copy */ + INT_SET(hdr_d->firstused, ARCH_CONVERT, XFS_LBSIZE(mp)); + /* handle truncation gracefully */ + if (!hdr_d->firstused) { + INT_SET(hdr_d->firstused, ARCH_CONVERT, + XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN); + } + hdr_d->usedbytes = 0; + hdr_d->count = 0; + hdr_d->holes = 0; + INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, + sizeof(xfs_attr_leaf_hdr_t)); + INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, + INT_GET(hdr_d->firstused, ARCH_CONVERT) + - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT)); + + /* + * Copy all entry's in the same (sorted) order, + * but allocate name/value pairs packed and in sequence. + */ + xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0, + (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp); + + xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1); + + kmem_free(tmpbuffer, XFS_LBSIZE(mp)); +} + +/* + * Redistribute the attribute list entries between two leaf nodes, + * taking into account the size of the new entry. + * + * NOTE: if new block is empty, then it will get the upper half of the + * old block. At present, all (one) callers pass in an empty second block. + * + * This code adjusts the args->index/blkno and args->index2/blkno2 fields + * to match what it is doing in splitting the attribute leaf block. Those + * values are used in "atomic rename" operations on attributes. Note that + * the "new" and "old" values can end up in different blocks. + */ +STATIC void +xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2) +{ + xfs_da_args_t *args; + xfs_da_state_blk_t *tmp_blk; + xfs_attr_leafblock_t *leaf1, *leaf2; + xfs_attr_leaf_hdr_t *hdr1, *hdr2; + int count, totallen, max, space, swap; + + /* + * Set up environment. + */ + ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC); + ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC); + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + args = state->args; + + /* + * Check ordering of blocks, reverse if it makes things simpler. + * + * NOTE: Given that all (current) callers pass in an empty + * second block, this code should never set "swap". + */ + swap = 0; + if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) { + tmp_blk = blk1; + blk1 = blk2; + blk2 = tmp_blk; + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + swap = 1; + } + hdr1 = &leaf1->hdr; + hdr2 = &leaf2->hdr; + + /* + * Examine entries until we reduce the absolute difference in + * byte usage between the two blocks to a minimum. Then get + * the direction to copy and the number of elements to move. + * + * "inleaf" is true if the new entry should be inserted into blk1. + * If "swap" is also true, then reverse the sense of "inleaf". + */ + state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2, + &count, &totallen); + if (swap) + state->inleaf = !state->inleaf; + + /* + * Move any entries required from leaf to leaf: + */ + if (count < INT_GET(hdr1->count, ARCH_CONVERT)) { + /* + * Figure the total bytes to be added to the destination leaf. + */ + /* number entries being moved */ + count = INT_GET(hdr1->count, ARCH_CONVERT) - count; + space = INT_GET(hdr1->usedbytes, ARCH_CONVERT) - totallen; + space += count * sizeof(xfs_attr_leaf_entry_t); + + /* + * leaf2 is the destination, compact it if it looks tight. + */ + max = INT_GET(hdr2->firstused, ARCH_CONVERT) + - sizeof(xfs_attr_leaf_hdr_t); + max -= INT_GET(hdr2->count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t); + if (space > max) { + xfs_attr_leaf_compact(args->trans, blk2->bp); + } + + /* + * Move high entries from leaf1 to low end of leaf2. + */ + xfs_attr_leaf_moveents(leaf1, + INT_GET(hdr1->count, ARCH_CONVERT)-count, + leaf2, 0, count, state->mp); + + xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1); + xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1); + } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) { + /* + * I assert that since all callers pass in an empty + * second buffer, this code should never execute. + */ + + /* + * Figure the total bytes to be added to the destination leaf. + */ + /* number entries being moved */ + count -= INT_GET(hdr1->count, ARCH_CONVERT); + space = totallen - INT_GET(hdr1->usedbytes, ARCH_CONVERT); + space += count * sizeof(xfs_attr_leaf_entry_t); + + /* + * leaf1 is the destination, compact it if it looks tight. + */ + max = INT_GET(hdr1->firstused, ARCH_CONVERT) + - sizeof(xfs_attr_leaf_hdr_t); + max -= INT_GET(hdr1->count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t); + if (space > max) { + xfs_attr_leaf_compact(args->trans, blk1->bp); + } + + /* + * Move low entries from leaf2 to high end of leaf1. + */ + xfs_attr_leaf_moveents(leaf2, 0, leaf1, + (int)INT_GET(hdr1->count, ARCH_CONVERT), count, + state->mp); + + xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1); + xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1); + } + + /* + * Copy out last hashval in each block for B-tree code. + */ + blk1->hashval = + INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count, + ARCH_CONVERT)-1].hashval, ARCH_CONVERT); + blk2->hashval = + INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count, + ARCH_CONVERT)-1].hashval, ARCH_CONVERT); + + /* + * Adjust the expected index for insertion. + * NOTE: this code depends on the (current) situation that the + * second block was originally empty. + * + * If the insertion point moved to the 2nd block, we must adjust + * the index. We must also track the entry just following the + * new entry for use in an "atomic rename" operation, that entry + * is always the "old" entry and the "new" entry is what we are + * inserting. The index/blkno fields refer to the "old" entry, + * while the index2/blkno2 fields refer to the "new" entry. + */ + if (blk1->index > INT_GET(leaf1->hdr.count, ARCH_CONVERT)) { + ASSERT(state->inleaf == 0); + blk2->index = blk1->index + - INT_GET(leaf1->hdr.count, ARCH_CONVERT); + args->index = args->index2 = blk2->index; + args->blkno = args->blkno2 = blk2->blkno; + } else if (blk1->index == INT_GET(leaf1->hdr.count, ARCH_CONVERT)) { + if (state->inleaf) { + args->index = blk1->index; + args->blkno = blk1->blkno; + args->index2 = 0; + args->blkno2 = blk2->blkno; + } else { + blk2->index = blk1->index + - INT_GET(leaf1->hdr.count, ARCH_CONVERT); + args->index = args->index2 = blk2->index; + args->blkno = args->blkno2 = blk2->blkno; + } + } else { + ASSERT(state->inleaf == 1); + args->index = args->index2 = blk1->index; + args->blkno = args->blkno2 = blk1->blkno; + } +} + +/* + * Examine entries until we reduce the absolute difference in + * byte usage between the two blocks to a minimum. + * GROT: Is this really necessary? With other than a 512 byte blocksize, + * GROT: there will always be enough room in either block for a new entry. + * GROT: Do a double-split for this case? + */ +STATIC int +xfs_attr_leaf_figure_balance(xfs_da_state_t *state, + xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2, + int *countarg, int *usedbytesarg) +{ + xfs_attr_leafblock_t *leaf1, *leaf2; + xfs_attr_leaf_hdr_t *hdr1, *hdr2; + xfs_attr_leaf_entry_t *entry; + int count, max, index, totallen, half; + int lastdelta, foundit, tmp; + + /* + * Set up environment. + */ + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + hdr1 = &leaf1->hdr; + hdr2 = &leaf2->hdr; + foundit = 0; + totallen = 0; + + /* + * Examine entries until we reduce the absolute difference in + * byte usage between the two blocks to a minimum. + */ + max = INT_GET(hdr1->count, ARCH_CONVERT) + + INT_GET(hdr2->count, ARCH_CONVERT); + half = (max+1) * sizeof(*entry); + half += INT_GET(hdr1->usedbytes, ARCH_CONVERT) + + INT_GET(hdr2->usedbytes, ARCH_CONVERT) + + xfs_attr_leaf_newentsize(state->args, + state->blocksize, NULL); + half /= 2; + lastdelta = state->blocksize; + entry = &leaf1->entries[0]; + for (count = index = 0; count < max; entry++, index++, count++) { + +#define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A)) + /* + * The new entry is in the first block, account for it. + */ + if (count == blk1->index) { + tmp = totallen + sizeof(*entry) + + xfs_attr_leaf_newentsize(state->args, + state->blocksize, + NULL); + if (XFS_ATTR_ABS(half - tmp) > lastdelta) + break; + lastdelta = XFS_ATTR_ABS(half - tmp); + totallen = tmp; + foundit = 1; + } + + /* + * Wrap around into the second block if necessary. + */ + if (count == INT_GET(hdr1->count, ARCH_CONVERT)) { + leaf1 = leaf2; + entry = &leaf1->entries[0]; + index = 0; + } + + /* + * Figure out if next leaf entry would be too much. + */ + tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1, + index); + if (XFS_ATTR_ABS(half - tmp) > lastdelta) + break; + lastdelta = XFS_ATTR_ABS(half - tmp); + totallen = tmp; +#undef XFS_ATTR_ABS + } + + /* + * Calculate the number of usedbytes that will end up in lower block. + * If new entry not in lower block, fix up the count. + */ + totallen -= count * sizeof(*entry); + if (foundit) { + totallen -= sizeof(*entry) + + xfs_attr_leaf_newentsize(state->args, + state->blocksize, + NULL); + } + + *countarg = count; + *usedbytesarg = totallen; + return(foundit); +} + +/*======================================================================== + * Routines used for shrinking the Btree. + *========================================================================*/ + +/* + * Check a leaf block and its neighbors to see if the block should be + * collapsed into one or the other neighbor. Always keep the block + * with the smaller block number. + * If the current block is over 50% full, don't try to join it, return 0. + * If the block is empty, fill in the state structure and return 2. + * If it can be collapsed, fill in the state structure and return 1. + * If nothing can be done, return 0. + * + * GROT: allow for INCOMPLETE entries in calculation. + */ +int +xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action) +{ + xfs_attr_leafblock_t *leaf; + xfs_da_state_blk_t *blk; + xfs_da_blkinfo_t *info; + int count, bytes, forward, error, retval, i; + xfs_dablk_t blkno; + xfs_dabuf_t *bp; + + /* + * Check for the degenerate case of the block being over 50% full. + * If so, it's not worth even looking to see if we might be able + * to coalesce with a sibling. + */ + blk = &state->path.blk[ state->path.active-1 ]; + info = blk->bp->data; + ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC); + leaf = (xfs_attr_leafblock_t *)info; + count = INT_GET(leaf->hdr.count, ARCH_CONVERT); + bytes = sizeof(xfs_attr_leaf_hdr_t) + + count * sizeof(xfs_attr_leaf_entry_t) + + INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); + if (bytes > (state->blocksize >> 1)) { + *action = 0; /* blk over 50%, don't try to join */ + return(0); + } + + /* + * Check for the degenerate case of the block being empty. + * If the block is empty, we'll simply delete it, no need to + * coalesce it with a sibling block. We choose (aribtrarily) + * to merge with the forward block unless it is NULL. + */ + if (count == 0) { + /* + * Make altpath point to the block we want to keep and + * path point to the block we want to drop (this one). + */ + forward = info->forw; + memcpy(&state->altpath, &state->path, sizeof(state->path)); + error = xfs_da_path_shift(state, &state->altpath, forward, + 0, &retval); + if (error) + return(error); + if (retval) { + *action = 0; + } else { + *action = 2; + } + return(0); + } + + /* + * Examine each sibling block to see if we can coalesce with + * at least 25% free space to spare. We need to figure out + * whether to merge with the forward or the backward block. + * We prefer coalescing with the lower numbered sibling so as + * to shrink an attribute list over time. + */ + /* start with smaller blk num */ + forward = (INT_GET(info->forw, ARCH_CONVERT) + < INT_GET(info->back, ARCH_CONVERT)); + for (i = 0; i < 2; forward = !forward, i++) { + if (forward) + blkno = INT_GET(info->forw, ARCH_CONVERT); + else + blkno = INT_GET(info->back, ARCH_CONVERT); + if (blkno == 0) + continue; + error = xfs_da_read_buf(state->args->trans, state->args->dp, + blkno, -1, &bp, XFS_ATTR_FORK); + if (error) + return(error); + ASSERT(bp != NULL); + + leaf = (xfs_attr_leafblock_t *)info; + count = INT_GET(leaf->hdr.count, ARCH_CONVERT); + bytes = state->blocksize - (state->blocksize>>2); + bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + count += INT_GET(leaf->hdr.count, ARCH_CONVERT); + bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); + bytes -= count * sizeof(xfs_attr_leaf_entry_t); + bytes -= sizeof(xfs_attr_leaf_hdr_t); + xfs_da_brelse(state->args->trans, bp); + if (bytes >= 0) + break; /* fits with at least 25% to spare */ + } + if (i >= 2) { + *action = 0; + return(0); + } + + /* + * Make altpath point to the block we want to keep (the lower + * numbered block) and path point to the block we want to drop. + */ + memcpy(&state->altpath, &state->path, sizeof(state->path)); + if (blkno < blk->blkno) { + error = xfs_da_path_shift(state, &state->altpath, forward, + 0, &retval); + } else { + error = xfs_da_path_shift(state, &state->path, forward, + 0, &retval); + } + if (error) + return(error); + if (retval) { + *action = 0; + } else { + *action = 1; + } + return(0); +} + +/* + * Remove a name from the leaf attribute list structure. + * + * Return 1 if leaf is less than 37% full, 0 if >= 37% full. + * If two leaves are 37% full, when combined they will leave 25% free. + */ +int +xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_hdr_t *hdr; + xfs_attr_leaf_map_t *map; + xfs_attr_leaf_entry_t *entry; + int before, after, smallest, entsize; + int tablesize, tmp, i; + xfs_mount_t *mp; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + hdr = &leaf->hdr; + mp = args->trans->t_mountp; + ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0) + && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8))); + ASSERT((args->index >= 0) + && (args->index < INT_GET(hdr->count, ARCH_CONVERT))); + ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) + >= ((INT_GET(hdr->count, ARCH_CONVERT) + * sizeof(*entry))+sizeof(*hdr))); + entry = &leaf->entries[args->index]; + ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) + >= INT_GET(hdr->firstused, ARCH_CONVERT)); + ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp)); + + /* + * Scan through free region table: + * check for adjacency of free'd entry with an existing one, + * find smallest free region in case we need to replace it, + * adjust any map that borders the entry table, + */ + tablesize = INT_GET(hdr->count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t) + + sizeof(xfs_attr_leaf_hdr_t); + map = &hdr->freemap[0]; + tmp = INT_GET(map->size, ARCH_CONVERT); + before = after = -1; + smallest = XFS_ATTR_LEAF_MAPSIZE - 1; + entsize = xfs_attr_leaf_entsize(leaf, args->index); + for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) { + ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp)); + ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp)); + if (INT_GET(map->base, ARCH_CONVERT) == tablesize) { + INT_MOD(map->base, ARCH_CONVERT, + -sizeof(xfs_attr_leaf_entry_t)); + INT_MOD(map->size, ARCH_CONVERT, + sizeof(xfs_attr_leaf_entry_t)); + } + + if ((INT_GET(map->base, ARCH_CONVERT) + + INT_GET(map->size, ARCH_CONVERT)) + == INT_GET(entry->nameidx, ARCH_CONVERT)) { + before = i; + } else if (INT_GET(map->base, ARCH_CONVERT) + == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) { + after = i; + } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) { + tmp = INT_GET(map->size, ARCH_CONVERT); + smallest = i; + } + } + + /* + * Coalesce adjacent freemap regions, + * or replace the smallest region. + */ + if ((before >= 0) || (after >= 0)) { + if ((before >= 0) && (after >= 0)) { + map = &hdr->freemap[before]; + INT_MOD(map->size, ARCH_CONVERT, entsize); + INT_MOD(map->size, ARCH_CONVERT, + INT_GET(hdr->freemap[after].size, + ARCH_CONVERT)); + hdr->freemap[after].base = 0; + hdr->freemap[after].size = 0; + } else if (before >= 0) { + map = &hdr->freemap[before]; + INT_MOD(map->size, ARCH_CONVERT, entsize); + } else { + map = &hdr->freemap[after]; + /* both on-disk, don't endian flip twice */ + map->base = entry->nameidx; + INT_MOD(map->size, ARCH_CONVERT, entsize); + } + } else { + /* + * Replace smallest region (if it is smaller than free'd entry) + */ + map = &hdr->freemap[smallest]; + if (INT_GET(map->size, ARCH_CONVERT) < entsize) { + INT_SET(map->base, ARCH_CONVERT, + INT_GET(entry->nameidx, ARCH_CONVERT)); + INT_SET(map->size, ARCH_CONVERT, entsize); + } + } + + /* + * Did we remove the first entry? + */ + if (INT_GET(entry->nameidx, ARCH_CONVERT) + == INT_GET(hdr->firstused, ARCH_CONVERT)) + smallest = 1; + else + smallest = 0; + + /* + * Compress the remaining entries and zero out the removed stuff. + */ + memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize); + INT_MOD(hdr->usedbytes, ARCH_CONVERT, -entsize); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index), + entsize)); + + tmp = (INT_GET(hdr->count, ARCH_CONVERT) - args->index) + * sizeof(xfs_attr_leaf_entry_t); + memmove((char *)entry, (char *)(entry+1), tmp); + INT_MOD(hdr->count, ARCH_CONVERT, -1); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry))); + entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)]; + memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t)); + + /* + * If we removed the first entry, re-find the first used byte + * in the name area. Note that if the entry was the "firstused", + * then we don't have a "hole" in our block resulting from + * removing the name. + */ + if (smallest) { + tmp = XFS_LBSIZE(mp); + entry = &leaf->entries[0]; + for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; + i >= 0; entry++, i--) { + ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) + >= INT_GET(hdr->firstused, ARCH_CONVERT)); + ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) + < XFS_LBSIZE(mp)); + if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp) + tmp = INT_GET(entry->nameidx, ARCH_CONVERT); + } + INT_SET(hdr->firstused, ARCH_CONVERT, tmp); + if (!hdr->firstused) { + INT_SET(hdr->firstused, ARCH_CONVERT, + tmp - XFS_ATTR_LEAF_NAME_ALIGN); + } + } else { + hdr->holes = 1; /* mark as needing compaction */ + } + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr))); + + /* + * Check if leaf is less than 50% full, caller may want to + * "join" the leaf with a sibling if so. + */ + tmp = sizeof(xfs_attr_leaf_hdr_t); + tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t); + tmp += INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT); + return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */ +} + +/* + * Move all the attribute list entries from drop_leaf into save_leaf. + */ +void +xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, + xfs_da_state_blk_t *save_blk) +{ + xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf; + xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr; + xfs_mount_t *mp; + char *tmpbuffer; + + /* + * Set up environment. + */ + mp = state->mp; + ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC); + ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC); + drop_leaf = drop_blk->bp->data; + save_leaf = save_blk->bp->data; + ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + drop_hdr = &drop_leaf->hdr; + save_hdr = &save_leaf->hdr; + + /* + * Save last hashval from dying block for later Btree fixup. + */ + drop_blk->hashval = + INT_GET(drop_leaf->entries[INT_GET(drop_leaf->hdr.count, + ARCH_CONVERT)-1].hashval, + ARCH_CONVERT); + + /* + * Check if we need a temp buffer, or can we do it in place. + * Note that we don't check "leaf" for holes because we will + * always be dropping it, toosmall() decided that for us already. + */ + if (save_hdr->holes == 0) { + /* + * dest leaf has no holes, so we add there. May need + * to make some room in the entry array. + */ + if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) { + xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0, + (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp); + } else { + xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, + INT_GET(save_hdr->count, ARCH_CONVERT), + (int)INT_GET(drop_hdr->count, ARCH_CONVERT), + mp); + } + } else { + /* + * Destination has holes, so we make a temporary copy + * of the leaf and add them both to that. + */ + tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP); + ASSERT(tmpbuffer != NULL); + memset(tmpbuffer, 0, state->blocksize); + tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer; + tmp_hdr = &tmp_leaf->hdr; + tmp_hdr->info = save_hdr->info; /* struct copy */ + tmp_hdr->count = 0; + INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize); + if (!tmp_hdr->firstused) { + INT_SET(tmp_hdr->firstused, ARCH_CONVERT, + state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN); + } + tmp_hdr->usedbytes = 0; + if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) { + xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0, + (int)INT_GET(drop_hdr->count, ARCH_CONVERT), + mp); + xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, + INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT), + (int)INT_GET(save_hdr->count, ARCH_CONVERT), + mp); + } else { + xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0, + (int)INT_GET(save_hdr->count, ARCH_CONVERT), + mp); + xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, + INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT), + (int)INT_GET(drop_hdr->count, ARCH_CONVERT), + mp); + } + memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize); + kmem_free(tmpbuffer, state->blocksize); + } + + xfs_da_log_buf(state->args->trans, save_blk->bp, 0, + state->blocksize - 1); + + /* + * Copy out last hashval in each block for B-tree code. + */ + save_blk->hashval = + INT_GET(save_leaf->entries[INT_GET(save_leaf->hdr.count, + ARCH_CONVERT)-1].hashval, + ARCH_CONVERT); +} + +/*======================================================================== + * Routines used for finding things in the Btree. + *========================================================================*/ + +/* + * Look up a name in a leaf attribute list structure. + * This is the internal routine, it uses the caller's buffer. + * + * Note that duplicate keys are allowed, but only check within the + * current leaf node. The Btree code must check in adjacent leaf nodes. + * + * Return in args->index the index into the entry[] array of either + * the found entry, or where the entry should have been (insert before + * that entry). + * + * Don't change the args->value unless we find the attribute. + */ +int +xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + xfs_attr_leaf_name_remote_t *name_rmt; + int probe, span; + xfs_dahash_t hashval; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) + < (XFS_LBSIZE(args->dp->i_mount)/8)); + + /* + * Binary search. (note: small blocks will skip this loop) + */ + hashval = args->hashval; + probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2; + for (entry = &leaf->entries[probe]; span > 4; + entry = &leaf->entries[probe]) { + span /= 2; + if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval) + probe += span; + else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval) + probe -= span; + else + break; + } + ASSERT((probe >= 0) && + (!leaf->hdr.count + || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)))); + ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT) + == hashval)); + + /* + * Since we may have duplicate hashval's, find the first matching + * hashval in the leaf. + */ + while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT) + >= hashval)) { + entry--; + probe--; + } + while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) + && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) { + entry++; + probe++; + } + if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT)) + || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) { + args->index = probe; + return(XFS_ERROR(ENOATTR)); + } + + /* + * Duplicate keys may be present, so search all of them for a match. + */ + for ( ; (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) + && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval); + entry++, probe++) { +/* + * GROT: Add code to remove incomplete entries. + */ + /* + * If we are looking for INCOMPLETE entries, show only those. + * If we are looking for complete entries, show only those. + */ + if ((args->flags & XFS_ATTR_INCOMPLETE) != + (entry->flags & XFS_ATTR_INCOMPLETE)) { + continue; + } + if (entry->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe); + if (name_loc->namelen != args->namelen) + continue; + if (memcmp(args->name, (char *)name_loc->nameval, + args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((entry->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((entry->flags & XFS_ATTR_ROOT) != 0)) + continue; + args->index = probe; + return(XFS_ERROR(EEXIST)); + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe); + if (name_rmt->namelen != args->namelen) + continue; + if (memcmp(args->name, (char *)name_rmt->name, + args->namelen) != 0) + continue; + if (((args->flags & ATTR_SECURE) != 0) != + ((entry->flags & XFS_ATTR_SECURE) != 0)) + continue; + if (((args->flags & ATTR_ROOT) != 0) != + ((entry->flags & XFS_ATTR_ROOT) != 0)) + continue; + args->index = probe; + args->rmtblkno + = INT_GET(name_rmt->valueblk, ARCH_CONVERT); + args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, + INT_GET(name_rmt->valuelen, + ARCH_CONVERT)); + return(XFS_ERROR(EEXIST)); + } + } + args->index = probe; + return(XFS_ERROR(ENOATTR)); +} + +/* + * Get the value associated with an attribute name from a leaf attribute + * list structure. + */ +int +xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args) +{ + int valuelen; + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + xfs_attr_leaf_name_remote_t *name_rmt; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) + < (XFS_LBSIZE(args->dp->i_mount)/8)); + ASSERT(args->index < ((int)INT_GET(leaf->hdr.count, ARCH_CONVERT))); + + entry = &leaf->entries[args->index]; + if (entry->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); + ASSERT(name_loc->namelen == args->namelen); + ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0); + valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT); + if (args->flags & ATTR_KERNOVAL) { + args->valuelen = valuelen; + return(0); + } + if (args->valuelen < valuelen) { + args->valuelen = valuelen; + return(XFS_ERROR(ERANGE)); + } + args->valuelen = valuelen; + memcpy(args->value, &name_loc->nameval[args->namelen], valuelen); + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); + ASSERT(name_rmt->namelen == args->namelen); + ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0); + valuelen = INT_GET(name_rmt->valuelen, ARCH_CONVERT); + args->rmtblkno = INT_GET(name_rmt->valueblk, ARCH_CONVERT); + args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen); + if (args->flags & ATTR_KERNOVAL) { + args->valuelen = valuelen; + return(0); + } + if (args->valuelen < valuelen) { + args->valuelen = valuelen; + return(XFS_ERROR(ERANGE)); + } + args->valuelen = valuelen; + } + return(0); +} + +/*======================================================================== + * Utility routines. + *========================================================================*/ + +/* + * Move the indicated entries from one leaf to another. + * NOTE: this routine modifies both source and destination leaves. + */ +/*ARGSUSED*/ +STATIC void +xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s, + xfs_attr_leafblock_t *leaf_d, int start_d, + int count, xfs_mount_t *mp) +{ + xfs_attr_leaf_hdr_t *hdr_s, *hdr_d; + xfs_attr_leaf_entry_t *entry_s, *entry_d; + int desti, tmp, i; + + /* + * Check for nothing to do. + */ + if (count == 0) + return; + + /* + * Set up environment. + */ + ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + hdr_s = &leaf_s->hdr; + hdr_d = &leaf_d->hdr; + ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0) + && (INT_GET(hdr_s->count, ARCH_CONVERT) + < (XFS_LBSIZE(mp)/8))); + ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >= + ((INT_GET(hdr_s->count, ARCH_CONVERT) + * sizeof(*entry_s))+sizeof(*hdr_s))); + ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)); + ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= + ((INT_GET(hdr_d->count, ARCH_CONVERT) + * sizeof(*entry_d))+sizeof(*hdr_d))); + + ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT)); + ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT)); + ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT)); + + /* + * Move the entries in the destination leaf up to make a hole? + */ + if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) { + tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d; + tmp *= sizeof(xfs_attr_leaf_entry_t); + entry_s = &leaf_d->entries[start_d]; + entry_d = &leaf_d->entries[start_d + count]; + memmove((char *)entry_d, (char *)entry_s, tmp); + } + + /* + * Copy all entry's in the same (sorted) order, + * but allocate attribute info packed and in sequence. + */ + entry_s = &leaf_s->entries[start_s]; + entry_d = &leaf_d->entries[start_d]; + desti = start_d; + for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) { + ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + >= INT_GET(hdr_s->firstused, ARCH_CONVERT)); + tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i); +#ifdef GROT + /* + * Code to drop INCOMPLETE entries. Difficult to use as we + * may also need to change the insertion index. Code turned + * off for 6.2, should be revisited later. + */ + if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */ + memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp); + INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp); + INT_MOD(hdr_s->count, ARCH_CONVERT, -1); + entry_d--; /* to compensate for ++ in loop hdr */ + desti--; + if ((start_s + i) < offset) + result++; /* insertion index adjustment */ + } else { +#endif /* GROT */ + INT_MOD(hdr_d->firstused, ARCH_CONVERT, -tmp); + /* both on-disk, don't endian flip twice */ + entry_d->hashval = entry_s->hashval; + /* both on-disk, don't endian flip twice */ + entry_d->nameidx = hdr_d->firstused; + entry_d->flags = entry_s->flags; + ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp + <= XFS_LBSIZE(mp)); + memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti), + XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp); + ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp + <= XFS_LBSIZE(mp)); + memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp); + INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp); + INT_MOD(hdr_d->usedbytes, ARCH_CONVERT, tmp); + INT_MOD(hdr_s->count, ARCH_CONVERT, -1); + INT_MOD(hdr_d->count, ARCH_CONVERT, 1); + tmp = INT_GET(hdr_d->count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t) + + sizeof(xfs_attr_leaf_hdr_t); + ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp); +#ifdef GROT + } +#endif /* GROT */ + } + + /* + * Zero out the entries we just copied. + */ + if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) { + tmp = count * sizeof(xfs_attr_leaf_entry_t); + entry_s = &leaf_s->entries[start_s]; + ASSERT(((char *)entry_s + tmp) <= + ((char *)leaf_s + XFS_LBSIZE(mp))); + memset((char *)entry_s, 0, tmp); + } else { + /* + * Move the remaining entries down to fill the hole, + * then zero the entries at the top. + */ + tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count; + tmp *= sizeof(xfs_attr_leaf_entry_t); + entry_s = &leaf_s->entries[start_s + count]; + entry_d = &leaf_s->entries[start_s]; + memmove((char *)entry_d, (char *)entry_s, tmp); + + tmp = count * sizeof(xfs_attr_leaf_entry_t); + entry_s = &leaf_s->entries[INT_GET(hdr_s->count, + ARCH_CONVERT)]; + ASSERT(((char *)entry_s + tmp) <= + ((char *)leaf_s + XFS_LBSIZE(mp))); + memset((char *)entry_s, 0, tmp); + } + + /* + * Fill in the freemap information + */ + INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, + sizeof(xfs_attr_leaf_hdr_t)); + INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT, + INT_GET(hdr_d->count, ARCH_CONVERT) + * sizeof(xfs_attr_leaf_entry_t)); + INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, + INT_GET(hdr_d->firstused, ARCH_CONVERT) + - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT)); + hdr_d->freemap[1].base = 0; + hdr_d->freemap[2].base = 0; + hdr_d->freemap[1].size = 0; + hdr_d->freemap[2].size = 0; + hdr_s->holes = 1; /* leaf may not be compact */ +} + +/* + * Compare two leaf blocks "order". + * Return 0 unless leaf2 should go before leaf1. + */ +int +xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp) +{ + xfs_attr_leafblock_t *leaf1, *leaf2; + + leaf1 = leaf1_bp->data; + leaf2 = leaf2_bp->data; + ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC) && + (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC)); + if ( (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0) + && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0) + && ( (INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) < + INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT)) + || (INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count, + ARCH_CONVERT)-1].hashval, ARCH_CONVERT) < + INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count, + ARCH_CONVERT)-1].hashval, ARCH_CONVERT))) ) { + return(1); + } + return(0); +} + +/* + * Pick up the last hashvalue from a leaf block. + */ +xfs_dahash_t +xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count) +{ + xfs_attr_leafblock_t *leaf; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + if (count) + *count = INT_GET(leaf->hdr.count, ARCH_CONVERT); + if (!leaf->hdr.count) + return(0); + return(INT_GET(leaf->entries[INT_GET(leaf->hdr.count, + ARCH_CONVERT)-1].hashval, ARCH_CONVERT)); +} + +/* + * Calculate the number of bytes used to store the indicated attribute + * (whether local or remote only calculate bytes in this block). + */ +int +xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index) +{ + xfs_attr_leaf_name_local_t *name_loc; + xfs_attr_leaf_name_remote_t *name_rmt; + int size; + + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + if (leaf->entries[index].flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index); + size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen, + INT_GET(name_loc->valuelen, + ARCH_CONVERT)); + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index); + size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen); + } + return(size); +} + +/* + * Calculate the number of bytes that would be required to store the new + * attribute (whether local or remote only calculate bytes in this block). + * This routine decides as a side effect whether the attribute will be + * a "local" or a "remote" attribute. + */ +int +xfs_attr_leaf_newentsize(xfs_da_args_t *args, int blocksize, int *local) +{ + int size; + + size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(args->namelen, args->valuelen); + if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) { + if (local) { + *local = 1; + } + } else { + size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(args->namelen); + if (local) { + *local = 0; + } + } + return(size); +} + +/* + * Copy out attribute list entries for attr_list(), for leaf attribute lists. + */ +int +xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) +{ + attrlist_cursor_kern_t *cursor; + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_local_t *name_loc; + xfs_attr_leaf_name_remote_t *name_rmt; + int retval, i; + + ASSERT(bp != NULL); + leaf = bp->data; + cursor = context->cursor; + cursor->initted = 1; + + xfs_attr_trace_l_cl("blk start", context, leaf); + + /* + * Re-find our place in the leaf block if this is a new syscall. + */ + if (context->resynch) { + entry = &leaf->entries[0]; + for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); + entry++, i++) { + if (INT_GET(entry->hashval, ARCH_CONVERT) + == cursor->hashval) { + if (cursor->offset == context->dupcnt) { + context->dupcnt = 0; + break; + } + context->dupcnt++; + } else if (INT_GET(entry->hashval, ARCH_CONVERT) + > cursor->hashval) { + context->dupcnt = 0; + break; + } + } + if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) { + xfs_attr_trace_l_c("not found", context); + return(0); + } + } else { + entry = &leaf->entries[0]; + i = 0; + } + context->resynch = 0; + + /* + * We have found our place, start copying out the new attributes. + */ + retval = 0; + for ( ; (i < INT_GET(leaf->hdr.count, ARCH_CONVERT)) + && (retval == 0); entry++, i++) { + attrnames_t *namesp; + + if (INT_GET(entry->hashval, ARCH_CONVERT) != cursor->hashval) { + cursor->hashval = INT_GET(entry->hashval, ARCH_CONVERT); + cursor->offset = 0; + } + + if (entry->flags & XFS_ATTR_INCOMPLETE) + continue; /* skip incomplete entries */ + if (((context->flags & ATTR_SECURE) != 0) != + ((entry->flags & XFS_ATTR_SECURE) != 0) && + !(context->flags & ATTR_KERNORMALS)) + continue; /* skip non-matching entries */ + if (((context->flags & ATTR_ROOT) != 0) != + ((entry->flags & XFS_ATTR_ROOT) != 0) && + !(context->flags & ATTR_KERNROOTLS)) + continue; /* skip non-matching entries */ + + namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure : + ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted : + &attr_user); + + if (entry->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); + if (context->flags & ATTR_KERNOVAL) { + ASSERT(context->flags & ATTR_KERNAMELS); + context->count += namesp->attr_namelen + + (int)name_loc->namelen + 1; + } else { + retval = xfs_attr_put_listent(context, namesp, + (char *)name_loc->nameval, + (int)name_loc->namelen, + (int)INT_GET(name_loc->valuelen, + ARCH_CONVERT)); + } + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); + if (context->flags & ATTR_KERNOVAL) { + ASSERT(context->flags & ATTR_KERNAMELS); + context->count += namesp->attr_namelen + + (int)name_rmt->namelen + 1; + } else { + retval = xfs_attr_put_listent(context, namesp, + (char *)name_rmt->name, + (int)name_rmt->namelen, + (int)INT_GET(name_rmt->valuelen, + ARCH_CONVERT)); + } + } + if (retval == 0) { + cursor->offset++; + } + } + xfs_attr_trace_l_cl("blk end", context, leaf); + return(retval); +} + +#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \ + (((struct attrlist_ent *) 0)->a_name - (char *) 0) +#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \ + ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \ + & ~(sizeof(u_int32_t)-1)) + +/* + * Format an attribute and copy it out to the user's buffer. + * Take care to check values and protect against them changing later, + * we may be reading them directly out of a user buffer. + */ +/*ARGSUSED*/ +int +xfs_attr_put_listent(xfs_attr_list_context_t *context, + attrnames_t *namesp, char *name, int namelen, int valuelen) +{ + attrlist_ent_t *aep; + int arraytop; + + ASSERT(!(context->flags & ATTR_KERNOVAL)); + if (context->flags & ATTR_KERNAMELS) { + char *offset; + + ASSERT(context->count >= 0); + + arraytop = context->count + namesp->attr_namelen + namelen + 1; + if (arraytop > context->firstu) { + context->count = -1; /* insufficient space */ + return(1); + } + offset = (char *)context->alist + context->count; + strncpy(offset, namesp->attr_name, namesp->attr_namelen); + offset += namesp->attr_namelen; + strncpy(offset, name, namelen); /* real name */ + offset += namelen; + *offset = '\0'; + context->count += namesp->attr_namelen + namelen + 1; + return(0); + } + + ASSERT(context->count >= 0); + ASSERT(context->count < (ATTR_MAX_VALUELEN/8)); + ASSERT(context->firstu >= sizeof(*context->alist)); + ASSERT(context->firstu <= context->bufsize); + + arraytop = sizeof(*context->alist) + + context->count * sizeof(context->alist->al_offset[0]); + context->firstu -= ATTR_ENTSIZE(namelen); + if (context->firstu < arraytop) { + xfs_attr_trace_l_c("buffer full", context); + context->alist->al_more = 1; + return(1); + } + + aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]); + aep->a_valuelen = valuelen; + memcpy(aep->a_name, name, namelen); + aep->a_name[ namelen ] = 0; + context->alist->al_offset[ context->count++ ] = context->firstu; + context->alist->al_count = context->count; + xfs_attr_trace_l_c("add", context); + return(0); +} + +/*======================================================================== + * Manage the INCOMPLETE flag in a leaf entry + *========================================================================*/ + +/* + * Clear the INCOMPLETE flag on an entry in a leaf block. + */ +int +xfs_attr_leaf_clearflag(xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_remote_t *name_rmt; + xfs_dabuf_t *bp; + int error; +#ifdef DEBUG + xfs_attr_leaf_name_local_t *name_loc; + int namelen; + char *name; +#endif /* DEBUG */ + + /* + * Set up the operation. + */ + error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, + XFS_ATTR_FORK); + if (error) { + return(error); + } + ASSERT(bp != NULL); + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT)); + ASSERT(args->index >= 0); + entry = &leaf->entries[ args->index ]; + ASSERT(entry->flags & XFS_ATTR_INCOMPLETE); + +#ifdef DEBUG + if (entry->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index); + namelen = name_loc->namelen; + name = (char *)name_loc->nameval; + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); + namelen = name_rmt->namelen; + name = (char *)name_rmt->name; + } + ASSERT(INT_GET(entry->hashval, ARCH_CONVERT) == args->hashval); + ASSERT(namelen == args->namelen); + ASSERT(memcmp(name, args->name, namelen) == 0); +#endif /* DEBUG */ + + entry->flags &= ~XFS_ATTR_INCOMPLETE; + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); + + if (args->rmtblkno) { + ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0); + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); + INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno); + INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); + } + xfs_da_buf_done(bp); + + /* + * Commit the flag value change and start the next trans in series. + */ + error = xfs_attr_rolltrans(&args->trans, args->dp); + + return(error); +} + +/* + * Set the INCOMPLETE flag on an entry in a leaf block. + */ +int +xfs_attr_leaf_setflag(xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_remote_t *name_rmt; + xfs_dabuf_t *bp; + int error; + + /* + * Set up the operation. + */ + error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, + XFS_ATTR_FORK); + if (error) { + return(error); + } + ASSERT(bp != NULL); + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT)); + ASSERT(args->index >= 0); + entry = &leaf->entries[ args->index ]; + + ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0); + entry->flags |= XFS_ATTR_INCOMPLETE; + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); + if ((entry->flags & XFS_ATTR_LOCAL) == 0) { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index); + name_rmt->valueblk = 0; + name_rmt->valuelen = 0; + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt))); + } + xfs_da_buf_done(bp); + + /* + * Commit the flag value change and start the next trans in series. + */ + error = xfs_attr_rolltrans(&args->trans, args->dp); + + return(error); +} + +/* + * In a single transaction, clear the INCOMPLETE flag on the leaf entry + * given by args->blkno/index and set the INCOMPLETE flag on the leaf + * entry given by args->blkno2/index2. + * + * Note that they could be in different blocks, or in the same block. + */ +int +xfs_attr_leaf_flipflags(xfs_da_args_t *args) +{ + xfs_attr_leafblock_t *leaf1, *leaf2; + xfs_attr_leaf_entry_t *entry1, *entry2; + xfs_attr_leaf_name_remote_t *name_rmt; + xfs_dabuf_t *bp1, *bp2; + int error; +#ifdef DEBUG + xfs_attr_leaf_name_local_t *name_loc; + int namelen1, namelen2; + char *name1, *name2; +#endif /* DEBUG */ + + /* + * Read the block containing the "old" attr + */ + error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1, + XFS_ATTR_FORK); + if (error) { + return(error); + } + ASSERT(bp1 != NULL); + + /* + * Read the block containing the "new" attr, if it is different + */ + if (args->blkno2 != args->blkno) { + error = xfs_da_read_buf(args->trans, args->dp, args->blkno2, + -1, &bp2, XFS_ATTR_FORK); + if (error) { + return(error); + } + ASSERT(bp2 != NULL); + } else { + bp2 = bp1; + } + + leaf1 = bp1->data; + ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(args->index < INT_GET(leaf1->hdr.count, ARCH_CONVERT)); + ASSERT(args->index >= 0); + entry1 = &leaf1->entries[ args->index ]; + + leaf2 = bp2->data; + ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + ASSERT(args->index2 < INT_GET(leaf2->hdr.count, ARCH_CONVERT)); + ASSERT(args->index2 >= 0); + entry2 = &leaf2->entries[ args->index2 ]; + +#ifdef DEBUG + if (entry1->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index); + namelen1 = name_loc->namelen; + name1 = (char *)name_loc->nameval; + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index); + namelen1 = name_rmt->namelen; + name1 = (char *)name_rmt->name; + } + if (entry2->flags & XFS_ATTR_LOCAL) { + name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2); + namelen2 = name_loc->namelen; + name2 = (char *)name_loc->nameval; + } else { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2); + namelen2 = name_rmt->namelen; + name2 = (char *)name_rmt->name; + } + ASSERT(INT_GET(entry1->hashval, ARCH_CONVERT) == INT_GET(entry2->hashval, ARCH_CONVERT)); + ASSERT(namelen1 == namelen2); + ASSERT(memcmp(name1, name2, namelen1) == 0); +#endif /* DEBUG */ + + ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE); + ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0); + + entry1->flags &= ~XFS_ATTR_INCOMPLETE; + xfs_da_log_buf(args->trans, bp1, + XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1))); + if (args->rmtblkno) { + ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0); + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index); + INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno); + INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen); + xfs_da_log_buf(args->trans, bp1, + XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt))); + } + + entry2->flags |= XFS_ATTR_INCOMPLETE; + xfs_da_log_buf(args->trans, bp2, + XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2))); + if ((entry2->flags & XFS_ATTR_LOCAL) == 0) { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2); + name_rmt->valueblk = 0; + name_rmt->valuelen = 0; + xfs_da_log_buf(args->trans, bp2, + XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt))); + } + xfs_da_buf_done(bp1); + if (bp1 != bp2) + xfs_da_buf_done(bp2); + + /* + * Commit the flag value change and start the next trans in series. + */ + error = xfs_attr_rolltrans(&args->trans, args->dp); + + return(error); +} + +/*======================================================================== + * Indiscriminately delete the entire attribute fork + *========================================================================*/ + +/* + * Recurse (gasp!) through the attribute nodes until we find leaves. + * We're doing a depth-first traversal in order to invalidate everything. + */ +int +xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp) +{ + xfs_da_blkinfo_t *info; + xfs_daddr_t blkno; + xfs_dabuf_t *bp; + int error; + + /* + * Read block 0 to see what we have to work with. + * We only get here if we have extents, since we remove + * the extents in reverse order the extent containing + * block 0 must still be there. + */ + error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK); + if (error) + return(error); + blkno = xfs_da_blkno(bp); + + /* + * Invalidate the tree, even if the "tree" is only a single leaf block. + * This is a depth-first traversal! + */ + info = bp->data; + if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) { + error = xfs_attr_node_inactive(trans, dp, bp, 1); + } else if (INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) { + error = xfs_attr_leaf_inactive(trans, dp, bp); + } else { + error = XFS_ERROR(EIO); + xfs_da_brelse(*trans, bp); + } + if (error) + return(error); + + /* + * Invalidate the incore copy of the root block. + */ + error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK); + if (error) + return(error); + xfs_da_binval(*trans, bp); /* remove from cache */ + /* + * Commit the invalidate and start the next transaction. + */ + error = xfs_attr_rolltrans(trans, dp); + + return (error); +} + +/* + * Recurse (gasp!) through the attribute nodes until we find leaves. + * We're doing a depth-first traversal in order to invalidate everything. + */ +int +xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp, + int level) +{ + xfs_da_blkinfo_t *info; + xfs_da_intnode_t *node; + xfs_dablk_t child_fsb; + xfs_daddr_t parent_blkno, child_blkno; + int error, count, i; + xfs_dabuf_t *child_bp; + + /* + * Since this code is recursive (gasp!) we must protect ourselves. + */ + if (level > XFS_DA_NODE_MAXDEPTH) { + xfs_da_brelse(*trans, bp); /* no locks for later trans */ + return(XFS_ERROR(EIO)); + } + + node = bp->data; + ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT) + == XFS_DA_NODE_MAGIC); + parent_blkno = xfs_da_blkno(bp); /* save for re-read later */ + count = INT_GET(node->hdr.count, ARCH_CONVERT); + if (!count) { + xfs_da_brelse(*trans, bp); + return(0); + } + child_fsb = INT_GET(node->btree[0].before, ARCH_CONVERT); + xfs_da_brelse(*trans, bp); /* no locks for later trans */ + + /* + * If this is the node level just above the leaves, simply loop + * over the leaves removing all of them. If this is higher up + * in the tree, recurse downward. + */ + for (i = 0; i < count; i++) { + /* + * Read the subsidiary block to see what we have to work with. + * Don't do this in a transaction. This is a depth-first + * traversal of the tree so we may deal with many blocks + * before we come back to this one. + */ + error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp, + XFS_ATTR_FORK); + if (error) + return(error); + if (child_bp) { + /* save for re-read later */ + child_blkno = xfs_da_blkno(child_bp); + + /* + * Invalidate the subtree, however we have to. + */ + info = child_bp->data; + if (INT_GET(info->magic, ARCH_CONVERT) + == XFS_DA_NODE_MAGIC) { + error = xfs_attr_node_inactive(trans, dp, + child_bp, level+1); + } else if (INT_GET(info->magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC) { + error = xfs_attr_leaf_inactive(trans, dp, + child_bp); + } else { + error = XFS_ERROR(EIO); + xfs_da_brelse(*trans, child_bp); + } + if (error) + return(error); + + /* + * Remove the subsidiary block from the cache + * and from the log. + */ + error = xfs_da_get_buf(*trans, dp, 0, child_blkno, + &child_bp, XFS_ATTR_FORK); + if (error) + return(error); + xfs_da_binval(*trans, child_bp); + } + + /* + * If we're not done, re-read the parent to get the next + * child block number. + */ + if ((i+1) < count) { + error = xfs_da_read_buf(*trans, dp, 0, parent_blkno, + &bp, XFS_ATTR_FORK); + if (error) + return(error); + child_fsb = INT_GET(node->btree[i+1].before, ARCH_CONVERT); + xfs_da_brelse(*trans, bp); + } + /* + * Atomically commit the whole invalidate stuff. + */ + if ((error = xfs_attr_rolltrans(trans, dp))) + return (error); + } + + return(0); +} + +/* + * Invalidate all of the "remote" value regions pointed to by a particular + * leaf block. + * Note that we must release the lock on the buffer so that we are not + * caught holding something that the logging code wants to flush to disk. + */ +int +xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp) +{ + xfs_attr_leafblock_t *leaf; + xfs_attr_leaf_entry_t *entry; + xfs_attr_leaf_name_remote_t *name_rmt; + xfs_attr_inactive_list_t *list, *lp; + int error, count, size, tmp, i; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + + /* + * Count the number of "remote" value extents. + */ + count = 0; + entry = &leaf->entries[0]; + for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { + if ( INT_GET(entry->nameidx, ARCH_CONVERT) + && ((entry->flags & XFS_ATTR_LOCAL) == 0)) { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); + if (name_rmt->valueblk) + count++; + } + } + + /* + * If there are no "remote" values, we're done. + */ + if (count == 0) { + xfs_da_brelse(*trans, bp); + return(0); + } + + /* + * Allocate storage for a list of all the "remote" value extents. + */ + size = count * sizeof(xfs_attr_inactive_list_t); + list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP); + + /* + * Identify each of the "remote" value extents. + */ + lp = list; + entry = &leaf->entries[0]; + for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) { + if ( INT_GET(entry->nameidx, ARCH_CONVERT) + && ((entry->flags & XFS_ATTR_LOCAL) == 0)) { + name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); + if (name_rmt->valueblk) { + /* both on-disk, don't endian flip twice */ + lp->valueblk = name_rmt->valueblk; + INT_SET(lp->valuelen, ARCH_CONVERT, + XFS_B_TO_FSB(dp->i_mount, + INT_GET(name_rmt->valuelen, + ARCH_CONVERT))); + lp++; + } + } + } + xfs_da_brelse(*trans, bp); /* unlock for trans. in freextent() */ + + /* + * Invalidate each of the "remote" value extents. + */ + error = 0; + for (lp = list, i = 0; i < count; i++, lp++) { + tmp = xfs_attr_leaf_freextent(trans, dp, + INT_GET(lp->valueblk, + ARCH_CONVERT), + INT_GET(lp->valuelen, + ARCH_CONVERT)); + if (error == 0) + error = tmp; /* save only the 1st errno */ + } + + kmem_free((xfs_caddr_t)list, size); + return(error); +} + +/* + * Look at all the extents for this logical region, + * invalidate any buffers that are incore/in transactions. + */ +int +xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp, + xfs_dablk_t blkno, int blkcnt) +{ + xfs_bmbt_irec_t map; + xfs_dablk_t tblkno; + int tblkcnt, dblkcnt, nmap, error; + xfs_daddr_t dblkno; + xfs_buf_t *bp; + + /* + * Roll through the "value", invalidating the attribute value's + * blocks. + */ + tblkno = blkno; + tblkcnt = blkcnt; + while (tblkcnt > 0) { + /* + * Try to remember where we decided to put the value. + */ + nmap = 1; + error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt, + XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, + NULL, 0, &map, &nmap, NULL); + if (error) { + return(error); + } + ASSERT(nmap == 1); + ASSERT(map.br_startblock != DELAYSTARTBLOCK); + + /* + * If it's a hole, these are already unmapped + * so there's nothing to invalidate. + */ + if (map.br_startblock != HOLESTARTBLOCK) { + + dblkno = XFS_FSB_TO_DADDR(dp->i_mount, + map.br_startblock); + dblkcnt = XFS_FSB_TO_BB(dp->i_mount, + map.br_blockcount); + bp = xfs_trans_get_buf(*trans, + dp->i_mount->m_ddev_targp, + dblkno, dblkcnt, XFS_BUF_LOCK); + xfs_trans_binval(*trans, bp); + /* + * Roll to next transaction. + */ + if ((error = xfs_attr_rolltrans(trans, dp))) + return (error); + } + + tblkno += map.br_blockcount; + tblkcnt -= map.br_blockcount; + } + + return(0); +} + + +/* + * Roll from one trans in the sequence of PERMANENT transactions to the next. + */ +int +xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp) +{ + xfs_trans_t *trans; + unsigned int logres, count; + int error; + + /* + * Ensure that the inode is always logged. + */ + trans = *transp; + xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE); + + /* + * Copy the critical parameters from one trans to the next. + */ + logres = trans->t_log_res; + count = trans->t_log_count; + *transp = xfs_trans_dup(trans); + + /* + * Commit the current transaction. + * If this commit failed, then it'd just unlock those items that + * are not marked ihold. That also means that a filesystem shutdown + * is in progress. The caller takes the responsibility to cancel + * the duplicate transaction that gets returned. + */ + if ((error = xfs_trans_commit(trans, 0, NULL))) + return (error); + + trans = *transp; + + /* + * Reserve space in the log for th next transaction. + * This also pushes items in the "AIL", the list of logged items, + * out to disk if they are taking up space at the tail of the log + * that we want to use. This requires that either nothing be locked + * across this call, or that anything that is locked be logged in + * the prior and the next transactions. + */ + error = xfs_trans_reserve(trans, 0, logres, 0, + XFS_TRANS_PERM_LOG_RES, count); + /* + * Ensure that the inode is in the new transaction and locked. + */ + if (!error) { + xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL); + xfs_trans_ihold(trans, dp); + } + return (error); + +} |
