diff options
Diffstat (limited to 'fs/xfs/xfs_dir2_node.c')
| -rw-r--r-- | fs/xfs/xfs_dir2_node.c | 2020 |
1 files changed, 2020 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_node.c b/fs/xfs/xfs_dir2_node.c new file mode 100644 index 0000000..a7615d86 --- /dev/null +++ b/fs/xfs/xfs_dir2_node.c @@ -0,0 +1,2020 @@ +/* + * 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/ + */ + +/* + * xfs_dir2_node.c + * XFS directory implementation, version 2, node form files + * See data structures in xfs_dir2_node.h and xfs_da_btree.h. + */ + +#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_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_bmap_btree.h" +#include "xfs_attr_sf.h" +#include "xfs_dir_sf.h" +#include "xfs_dir2_sf.h" +#include "xfs_dinode.h" +#include "xfs_inode.h" +#include "xfs_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_dir2_data.h" +#include "xfs_dir2_leaf.h" +#include "xfs_dir2_block.h" +#include "xfs_dir2_node.h" +#include "xfs_dir2_trace.h" +#include "xfs_error.h" + +/* + * Function declarations. + */ +static void xfs_dir2_free_log_header(xfs_trans_t *tp, xfs_dabuf_t *bp); +static int xfs_dir2_leafn_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index); +#ifdef DEBUG +static void xfs_dir2_leafn_check(xfs_inode_t *dp, xfs_dabuf_t *bp); +#else +#define xfs_dir2_leafn_check(dp, bp) +#endif +static void xfs_dir2_leafn_moveents(xfs_da_args_t *args, xfs_dabuf_t *bp_s, + int start_s, xfs_dabuf_t *bp_d, int start_d, + int count); +static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state, + xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2); +static int xfs_dir2_leafn_remove(xfs_da_args_t *args, xfs_dabuf_t *bp, + int index, xfs_da_state_blk_t *dblk, + int *rval); +static int xfs_dir2_node_addname_int(xfs_da_args_t *args, + xfs_da_state_blk_t *fblk); + +/* + * Log entries from a freespace block. + */ +void +xfs_dir2_free_log_bests( + xfs_trans_t *tp, /* transaction pointer */ + xfs_dabuf_t *bp, /* freespace buffer */ + int first, /* first entry to log */ + int last) /* last entry to log */ +{ + xfs_dir2_free_t *free; /* freespace structure */ + + free = bp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + xfs_da_log_buf(tp, bp, + (uint)((char *)&free->bests[first] - (char *)free), + (uint)((char *)&free->bests[last] - (char *)free + + sizeof(free->bests[0]) - 1)); +} + +/* + * Log header from a freespace block. + */ +static void +xfs_dir2_free_log_header( + xfs_trans_t *tp, /* transaction pointer */ + xfs_dabuf_t *bp) /* freespace buffer */ +{ + xfs_dir2_free_t *free; /* freespace structure */ + + free = bp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + xfs_da_log_buf(tp, bp, (uint)((char *)&free->hdr - (char *)free), + (uint)(sizeof(xfs_dir2_free_hdr_t) - 1)); +} + +/* + * Convert a leaf-format directory to a node-format directory. + * We need to change the magic number of the leaf block, and copy + * the freespace table out of the leaf block into its own block. + */ +int /* error */ +xfs_dir2_leaf_to_node( + xfs_da_args_t *args, /* operation arguments */ + xfs_dabuf_t *lbp) /* leaf buffer */ +{ + xfs_inode_t *dp; /* incore directory inode */ + int error; /* error return value */ + xfs_dabuf_t *fbp; /* freespace buffer */ + xfs_dir2_db_t fdb; /* freespace block number */ + xfs_dir2_free_t *free; /* freespace structure */ + xfs_dir2_data_off_t *from; /* pointer to freespace entry */ + int i; /* leaf freespace index */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ + xfs_mount_t *mp; /* filesystem mount point */ + int n; /* count of live freespc ents */ + xfs_dir2_data_off_t off; /* freespace entry value */ + xfs_dir2_data_off_t *to; /* pointer to freespace entry */ + xfs_trans_t *tp; /* transaction pointer */ + + xfs_dir2_trace_args_b("leaf_to_node", args, lbp); + dp = args->dp; + mp = dp->i_mount; + tp = args->trans; + /* + * Add a freespace block to the directory. + */ + if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) { + return error; + } + ASSERT(fdb == XFS_DIR2_FREE_FIRSTDB(mp)); + /* + * Get the buffer for the new freespace block. + */ + if ((error = xfs_da_get_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, fdb), -1, &fbp, + XFS_DATA_FORK))) { + return error; + } + ASSERT(fbp != NULL); + free = fbp->data; + leaf = lbp->data; + ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf); + /* + * Initialize the freespace block header. + */ + INT_SET(free->hdr.magic, ARCH_CONVERT, XFS_DIR2_FREE_MAGIC); + free->hdr.firstdb = 0; + ASSERT(INT_GET(ltp->bestcount, ARCH_CONVERT) <= (uint)dp->i_d.di_size / mp->m_dirblksize); + INT_COPY(free->hdr.nvalid, ltp->bestcount, ARCH_CONVERT); + /* + * Copy freespace entries from the leaf block to the new block. + * Count active entries. + */ + for (i = n = 0, from = XFS_DIR2_LEAF_BESTS_P(ltp), to = free->bests; + i < INT_GET(ltp->bestcount, ARCH_CONVERT); i++, from++, to++) { + if ((off = INT_GET(*from, ARCH_CONVERT)) != NULLDATAOFF) + n++; + INT_SET(*to, ARCH_CONVERT, off); + } + INT_SET(free->hdr.nused, ARCH_CONVERT, n); + INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, XFS_DIR2_LEAFN_MAGIC); + /* + * Log everything. + */ + xfs_dir2_leaf_log_header(tp, lbp); + xfs_dir2_free_log_header(tp, fbp); + xfs_dir2_free_log_bests(tp, fbp, 0, INT_GET(free->hdr.nvalid, ARCH_CONVERT) - 1); + xfs_da_buf_done(fbp); + xfs_dir2_leafn_check(dp, lbp); + return 0; +} + +/* + * Add a leaf entry to a leaf block in a node-form directory. + * The other work necessary is done from the caller. + */ +static int /* error */ +xfs_dir2_leafn_add( + xfs_dabuf_t *bp, /* leaf buffer */ + xfs_da_args_t *args, /* operation arguments */ + int index) /* insertion pt for new entry */ +{ + int compact; /* compacting stale leaves */ + xfs_inode_t *dp; /* incore directory inode */ + int highstale; /* next stale entry */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + xfs_dir2_leaf_entry_t *lep; /* leaf entry */ + int lfloghigh; /* high leaf entry logging */ + int lfloglow; /* low leaf entry logging */ + int lowstale; /* previous stale entry */ + xfs_mount_t *mp; /* filesystem mount point */ + xfs_trans_t *tp; /* transaction pointer */ + + xfs_dir2_trace_args_sb("leafn_add", args, index, bp); + dp = args->dp; + mp = dp->i_mount; + tp = args->trans; + leaf = bp->data; + + /* + * Quick check just to make sure we are not going to index + * into other peoples memory + */ + if (index < 0) + return XFS_ERROR(EFSCORRUPTED); + + /* + * If there are already the maximum number of leaf entries in + * the block, if there are no stale entries it won't fit. + * Caller will do a split. If there are stale entries we'll do + * a compact. + */ + + if (INT_GET(leaf->hdr.count, ARCH_CONVERT) == XFS_DIR2_MAX_LEAF_ENTS(mp)) { + if (!leaf->hdr.stale) + return XFS_ERROR(ENOSPC); + compact = INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1; + } else + compact = 0; + ASSERT(index == 0 || INT_GET(leaf->ents[index - 1].hashval, ARCH_CONVERT) <= args->hashval); + ASSERT(index == INT_GET(leaf->hdr.count, ARCH_CONVERT) || + INT_GET(leaf->ents[index].hashval, ARCH_CONVERT) >= args->hashval); + + if (args->justcheck) + return 0; + + /* + * Compact out all but one stale leaf entry. Leaves behind + * the entry closest to index. + */ + if (compact) { + xfs_dir2_leaf_compact_x1(bp, &index, &lowstale, &highstale, + &lfloglow, &lfloghigh); + } + /* + * Set impossible logging indices for this case. + */ + else if (leaf->hdr.stale) { + lfloglow = INT_GET(leaf->hdr.count, ARCH_CONVERT); + lfloghigh = -1; + } + /* + * No stale entries, just insert a space for the new entry. + */ + if (!leaf->hdr.stale) { + lep = &leaf->ents[index]; + if (index < INT_GET(leaf->hdr.count, ARCH_CONVERT)) + memmove(lep + 1, lep, + (INT_GET(leaf->hdr.count, ARCH_CONVERT) - index) * sizeof(*lep)); + lfloglow = index; + lfloghigh = INT_GET(leaf->hdr.count, ARCH_CONVERT); + INT_MOD(leaf->hdr.count, ARCH_CONVERT, +1); + } + /* + * There are stale entries. We'll use one for the new entry. + */ + else { + /* + * If we didn't do a compact then we need to figure out + * which stale entry will be used. + */ + if (compact == 0) { + /* + * Find first stale entry before our insertion point. + */ + for (lowstale = index - 1; + lowstale >= 0 && + INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) != + XFS_DIR2_NULL_DATAPTR; + lowstale--) + continue; + /* + * Find next stale entry after insertion point. + * Stop looking if the answer would be worse than + * lowstale already found. + */ + for (highstale = index; + highstale < INT_GET(leaf->hdr.count, ARCH_CONVERT) && + INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) != + XFS_DIR2_NULL_DATAPTR && + (lowstale < 0 || + index - lowstale - 1 >= highstale - index); + highstale++) + continue; + } + /* + * Using the low stale entry. + * Shift entries up toward the stale slot. + */ + if (lowstale >= 0 && + (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) || + index - lowstale - 1 < highstale - index)) { + ASSERT(INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) == + XFS_DIR2_NULL_DATAPTR); + ASSERT(index - lowstale - 1 >= 0); + if (index - lowstale - 1 > 0) + memmove(&leaf->ents[lowstale], + &leaf->ents[lowstale + 1], + (index - lowstale - 1) * sizeof(*lep)); + lep = &leaf->ents[index - 1]; + lfloglow = MIN(lowstale, lfloglow); + lfloghigh = MAX(index - 1, lfloghigh); + } + /* + * Using the high stale entry. + * Shift entries down toward the stale slot. + */ + else { + ASSERT(INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) == + XFS_DIR2_NULL_DATAPTR); + ASSERT(highstale - index >= 0); + if (highstale - index > 0) + memmove(&leaf->ents[index + 1], + &leaf->ents[index], + (highstale - index) * sizeof(*lep)); + lep = &leaf->ents[index]; + lfloglow = MIN(index, lfloglow); + lfloghigh = MAX(highstale, lfloghigh); + } + INT_MOD(leaf->hdr.stale, ARCH_CONVERT, -1); + } + /* + * Insert the new entry, log everything. + */ + INT_SET(lep->hashval, ARCH_CONVERT, args->hashval); + INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_DB_OFF_TO_DATAPTR(mp, args->blkno, args->index)); + xfs_dir2_leaf_log_header(tp, bp); + xfs_dir2_leaf_log_ents(tp, bp, lfloglow, lfloghigh); + xfs_dir2_leafn_check(dp, bp); + return 0; +} + +#ifdef DEBUG +/* + * Check internal consistency of a leafn block. + */ +void +xfs_dir2_leafn_check( + xfs_inode_t *dp, /* incore directory inode */ + xfs_dabuf_t *bp) /* leaf buffer */ +{ + int i; /* leaf index */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + xfs_mount_t *mp; /* filesystem mount point */ + int stale; /* count of stale leaves */ + + leaf = bp->data; + mp = dp->i_mount; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) <= XFS_DIR2_MAX_LEAF_ENTS(mp)); + for (i = stale = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); i++) { + if (i + 1 < INT_GET(leaf->hdr.count, ARCH_CONVERT)) { + ASSERT(INT_GET(leaf->ents[i].hashval, ARCH_CONVERT) <= + INT_GET(leaf->ents[i + 1].hashval, ARCH_CONVERT)); + } + if (INT_GET(leaf->ents[i].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) + stale++; + } + ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) == stale); +} +#endif /* DEBUG */ + +/* + * Return the last hash value in the leaf. + * Stale entries are ok. + */ +xfs_dahash_t /* hash value */ +xfs_dir2_leafn_lasthash( + xfs_dabuf_t *bp, /* leaf buffer */ + int *count) /* count of entries in leaf */ +{ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + if (count) + *count = INT_GET(leaf->hdr.count, ARCH_CONVERT); + if (!leaf->hdr.count) + return 0; + return INT_GET(leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); +} + +/* + * Look up a leaf entry in a node-format leaf block. + * If this is an addname then the extrablk in state is a freespace block, + * otherwise it's a data block. + */ +int +xfs_dir2_leafn_lookup_int( + xfs_dabuf_t *bp, /* leaf buffer */ + xfs_da_args_t *args, /* operation arguments */ + int *indexp, /* out: leaf entry index */ + xfs_da_state_t *state) /* state to fill in */ +{ + xfs_dabuf_t *curbp; /* current data/free buffer */ + xfs_dir2_db_t curdb; /* current data block number */ + xfs_dir2_db_t curfdb; /* current free block number */ + xfs_dir2_data_entry_t *dep; /* data block entry */ + xfs_inode_t *dp; /* incore directory inode */ + int error; /* error return value */ + int fi; /* free entry index */ + xfs_dir2_free_t *free=NULL; /* free block structure */ + int index; /* leaf entry index */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + int length=0; /* length of new data entry */ + xfs_dir2_leaf_entry_t *lep; /* leaf entry */ + xfs_mount_t *mp; /* filesystem mount point */ + xfs_dir2_db_t newdb; /* new data block number */ + xfs_dir2_db_t newfdb; /* new free block number */ + xfs_trans_t *tp; /* transaction pointer */ + + dp = args->dp; + tp = args->trans; + mp = dp->i_mount; + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); +#ifdef __KERNEL__ + ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) > 0); +#endif + xfs_dir2_leafn_check(dp, bp); + /* + * Look up the hash value in the leaf entries. + */ + index = xfs_dir2_leaf_search_hash(args, bp); + /* + * Do we have a buffer coming in? + */ + if (state->extravalid) + curbp = state->extrablk.bp; + else + curbp = NULL; + /* + * For addname, it's a free block buffer, get the block number. + */ + if (args->addname) { + curfdb = curbp ? state->extrablk.blkno : -1; + curdb = -1; + length = XFS_DIR2_DATA_ENTSIZE(args->namelen); + if ((free = (curbp ? curbp->data : NULL))) + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + } + /* + * For others, it's a data block buffer, get the block number. + */ + else { + curfdb = -1; + curdb = curbp ? state->extrablk.blkno : -1; + } + /* + * Loop over leaf entries with the right hash value. + */ + for (lep = &leaf->ents[index]; + index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval; + lep++, index++) { + /* + * Skip stale leaf entries. + */ + if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) + continue; + /* + * Pull the data block number from the entry. + */ + newdb = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT)); + /* + * For addname, we're looking for a place to put the new entry. + * We want to use a data block with an entry of equal + * hash value to ours if there is one with room. + */ + if (args->addname) { + /* + * If this block isn't the data block we already have + * in hand, take a look at it. + */ + if (newdb != curdb) { + curdb = newdb; + /* + * Convert the data block to the free block + * holding its freespace information. + */ + newfdb = XFS_DIR2_DB_TO_FDB(mp, newdb); + /* + * If it's not the one we have in hand, + * read it in. + */ + if (newfdb != curfdb) { + /* + * If we had one before, drop it. + */ + if (curbp) + xfs_da_brelse(tp, curbp); + /* + * Read the free block. + */ + if ((error = xfs_da_read_buf(tp, dp, + XFS_DIR2_DB_TO_DA(mp, + newfdb), + -1, &curbp, + XFS_DATA_FORK))) { + return error; + } + curfdb = newfdb; + free = curbp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == + XFS_DIR2_FREE_MAGIC); + ASSERT((INT_GET(free->hdr.firstdb, ARCH_CONVERT) % + XFS_DIR2_MAX_FREE_BESTS(mp)) == + 0); + ASSERT(INT_GET(free->hdr.firstdb, ARCH_CONVERT) <= curdb); + ASSERT(curdb < + INT_GET(free->hdr.firstdb, ARCH_CONVERT) + + INT_GET(free->hdr.nvalid, ARCH_CONVERT)); + } + /* + * Get the index for our entry. + */ + fi = XFS_DIR2_DB_TO_FDINDEX(mp, curdb); + /* + * If it has room, return it. + */ + if (unlikely(INT_GET(free->bests[fi], ARCH_CONVERT) == NULLDATAOFF)) { + XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int", + XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + if (INT_GET(free->bests[fi], ARCH_CONVERT) >= length) { + *indexp = index; + state->extravalid = 1; + state->extrablk.bp = curbp; + state->extrablk.blkno = curfdb; + state->extrablk.index = fi; + state->extrablk.magic = + XFS_DIR2_FREE_MAGIC; + ASSERT(args->oknoent); + return XFS_ERROR(ENOENT); + } + } + } + /* + * Not adding a new entry, so we really want to find + * the name given to us. + */ + else { + /* + * If it's a different data block, go get it. + */ + if (newdb != curdb) { + /* + * If we had a block before, drop it. + */ + if (curbp) + xfs_da_brelse(tp, curbp); + /* + * Read the data block. + */ + if ((error = + xfs_da_read_buf(tp, dp, + XFS_DIR2_DB_TO_DA(mp, newdb), -1, + &curbp, XFS_DATA_FORK))) { + return error; + } + xfs_dir2_data_check(dp, curbp); + curdb = newdb; + } + /* + * Point to the data entry. + */ + dep = (xfs_dir2_data_entry_t *) + ((char *)curbp->data + + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT))); + /* + * Compare the entry, return it if it matches. + */ + if (dep->namelen == args->namelen && + dep->name[0] == args->name[0] && + memcmp(dep->name, args->name, args->namelen) == 0) { + args->inumber = INT_GET(dep->inumber, ARCH_CONVERT); + *indexp = index; + state->extravalid = 1; + state->extrablk.bp = curbp; + state->extrablk.blkno = curdb; + state->extrablk.index = + (int)((char *)dep - + (char *)curbp->data); + state->extrablk.magic = XFS_DIR2_DATA_MAGIC; + return XFS_ERROR(EEXIST); + } + } + } + /* + * Didn't find a match. + * If we are holding a buffer, give it back in case our caller + * finds it useful. + */ + if ((state->extravalid = (curbp != NULL))) { + state->extrablk.bp = curbp; + state->extrablk.index = -1; + /* + * For addname, giving back a free block. + */ + if (args->addname) { + state->extrablk.blkno = curfdb; + state->extrablk.magic = XFS_DIR2_FREE_MAGIC; + } + /* + * For other callers, giving back a data block. + */ + else { + state->extrablk.blkno = curdb; + state->extrablk.magic = XFS_DIR2_DATA_MAGIC; + } + } + /* + * Return the final index, that will be the insertion point. + */ + *indexp = index; + ASSERT(index == INT_GET(leaf->hdr.count, ARCH_CONVERT) || args->oknoent); + return XFS_ERROR(ENOENT); +} + +/* + * Move count leaf entries from source to destination leaf. + * Log entries and headers. Stale entries are preserved. + */ +static void +xfs_dir2_leafn_moveents( + xfs_da_args_t *args, /* operation arguments */ + xfs_dabuf_t *bp_s, /* source leaf buffer */ + int start_s, /* source leaf index */ + xfs_dabuf_t *bp_d, /* destination leaf buffer */ + int start_d, /* destination leaf index */ + int count) /* count of leaves to copy */ +{ + xfs_dir2_leaf_t *leaf_d; /* destination leaf structure */ + xfs_dir2_leaf_t *leaf_s; /* source leaf structure */ + int stale; /* count stale leaves copied */ + xfs_trans_t *tp; /* transaction pointer */ + + xfs_dir2_trace_args_bibii("leafn_moveents", args, bp_s, start_s, bp_d, + start_d, count); + /* + * Silently return if nothing to do. + */ + if (count == 0) { + return; + } + tp = args->trans; + leaf_s = bp_s->data; + leaf_d = bp_d->data; + /* + * If the destination index is not the end of the current + * destination leaf entries, open up a hole in the destination + * to hold the new entries. + */ + if (start_d < INT_GET(leaf_d->hdr.count, ARCH_CONVERT)) { + memmove(&leaf_d->ents[start_d + count], &leaf_d->ents[start_d], + (INT_GET(leaf_d->hdr.count, ARCH_CONVERT) - start_d) * + sizeof(xfs_dir2_leaf_entry_t)); + xfs_dir2_leaf_log_ents(tp, bp_d, start_d + count, + count + INT_GET(leaf_d->hdr.count, ARCH_CONVERT) - 1); + } + /* + * If the source has stale leaves, count the ones in the copy range + * so we can update the header correctly. + */ + if (leaf_s->hdr.stale) { + int i; /* temp leaf index */ + + for (i = start_s, stale = 0; i < start_s + count; i++) { + if (INT_GET(leaf_s->ents[i].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) + stale++; + } + } else + stale = 0; + /* + * Copy the leaf entries from source to destination. + */ + memcpy(&leaf_d->ents[start_d], &leaf_s->ents[start_s], + count * sizeof(xfs_dir2_leaf_entry_t)); + xfs_dir2_leaf_log_ents(tp, bp_d, start_d, start_d + count - 1); + /* + * If there are source entries after the ones we copied, + * delete the ones we copied by sliding the next ones down. + */ + if (start_s + count < INT_GET(leaf_s->hdr.count, ARCH_CONVERT)) { + memmove(&leaf_s->ents[start_s], &leaf_s->ents[start_s + count], + count * sizeof(xfs_dir2_leaf_entry_t)); + xfs_dir2_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1); + } + /* + * Update the headers and log them. + */ + INT_MOD(leaf_s->hdr.count, ARCH_CONVERT, -(count)); + INT_MOD(leaf_s->hdr.stale, ARCH_CONVERT, -(stale)); + INT_MOD(leaf_d->hdr.count, ARCH_CONVERT, count); + INT_MOD(leaf_d->hdr.stale, ARCH_CONVERT, stale); + xfs_dir2_leaf_log_header(tp, bp_s); + xfs_dir2_leaf_log_header(tp, bp_d); + xfs_dir2_leafn_check(args->dp, bp_s); + xfs_dir2_leafn_check(args->dp, bp_d); +} + +/* + * Determine the sort order of two leaf blocks. + * Returns 1 if both are valid and leaf2 should be before leaf1, else 0. + */ +int /* sort order */ +xfs_dir2_leafn_order( + xfs_dabuf_t *leaf1_bp, /* leaf1 buffer */ + xfs_dabuf_t *leaf2_bp) /* leaf2 buffer */ +{ + xfs_dir2_leaf_t *leaf1; /* leaf1 structure */ + xfs_dir2_leaf_t *leaf2; /* leaf2 structure */ + + leaf1 = leaf1_bp->data; + leaf2 = leaf2_bp->data; + ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0 && + INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0 && + (INT_GET(leaf2->ents[0].hashval, ARCH_CONVERT) < INT_GET(leaf1->ents[0].hashval, ARCH_CONVERT) || + INT_GET(leaf2->ents[INT_GET(leaf2->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT) < + INT_GET(leaf1->ents[INT_GET(leaf1->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT))) + return 1; + return 0; +} + +/* + * Rebalance leaf entries between two leaf blocks. + * This is actually only called when the second block is new, + * though the code deals with the general case. + * A new entry will be inserted in one of the blocks, and that + * entry is taken into account when balancing. + */ +static void +xfs_dir2_leafn_rebalance( + xfs_da_state_t *state, /* btree cursor */ + xfs_da_state_blk_t *blk1, /* first btree block */ + xfs_da_state_blk_t *blk2) /* second btree block */ +{ + xfs_da_args_t *args; /* operation arguments */ + int count; /* count (& direction) leaves */ + int isleft; /* new goes in left leaf */ + xfs_dir2_leaf_t *leaf1; /* first leaf structure */ + xfs_dir2_leaf_t *leaf2; /* second leaf structure */ + int mid; /* midpoint leaf index */ +#ifdef DEBUG + int oldstale; /* old count of stale leaves */ +#endif + int oldsum; /* old total leaf count */ + int swap; /* swapped leaf blocks */ + + args = state->args; + /* + * If the block order is wrong, swap the arguments. + */ + if ((swap = xfs_dir2_leafn_order(blk1->bp, blk2->bp))) { + xfs_da_state_blk_t *tmp; /* temp for block swap */ + + tmp = blk1; + blk1 = blk2; + blk2 = tmp; + } + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + oldsum = INT_GET(leaf1->hdr.count, ARCH_CONVERT) + INT_GET(leaf2->hdr.count, ARCH_CONVERT); +#ifdef DEBUG + oldstale = INT_GET(leaf1->hdr.stale, ARCH_CONVERT) + INT_GET(leaf2->hdr.stale, ARCH_CONVERT); +#endif + mid = oldsum >> 1; + /* + * If the old leaf count was odd then the new one will be even, + * so we need to divide the new count evenly. + */ + if (oldsum & 1) { + xfs_dahash_t midhash; /* middle entry hash value */ + + if (mid >= INT_GET(leaf1->hdr.count, ARCH_CONVERT)) + midhash = INT_GET(leaf2->ents[mid - INT_GET(leaf1->hdr.count, ARCH_CONVERT)].hashval, ARCH_CONVERT); + else + midhash = INT_GET(leaf1->ents[mid].hashval, ARCH_CONVERT); + isleft = args->hashval <= midhash; + } + /* + * If the old count is even then the new count is odd, so there's + * no preferred side for the new entry. + * Pick the left one. + */ + else + isleft = 1; + /* + * Calculate moved entry count. Positive means left-to-right, + * negative means right-to-left. Then move the entries. + */ + count = INT_GET(leaf1->hdr.count, ARCH_CONVERT) - mid + (isleft == 0); + if (count > 0) + xfs_dir2_leafn_moveents(args, blk1->bp, + INT_GET(leaf1->hdr.count, ARCH_CONVERT) - count, blk2->bp, 0, count); + else if (count < 0) + xfs_dir2_leafn_moveents(args, blk2->bp, 0, blk1->bp, + INT_GET(leaf1->hdr.count, ARCH_CONVERT), count); + ASSERT(INT_GET(leaf1->hdr.count, ARCH_CONVERT) + INT_GET(leaf2->hdr.count, ARCH_CONVERT) == oldsum); + ASSERT(INT_GET(leaf1->hdr.stale, ARCH_CONVERT) + INT_GET(leaf2->hdr.stale, ARCH_CONVERT) == oldstale); + /* + * Mark whether we're inserting into the old or new leaf. + */ + if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) < INT_GET(leaf2->hdr.count, ARCH_CONVERT)) + state->inleaf = swap; + else if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > INT_GET(leaf2->hdr.count, ARCH_CONVERT)) + state->inleaf = !swap; + else + state->inleaf = + swap ^ (blk1->index <= INT_GET(leaf1->hdr.count, ARCH_CONVERT)); + /* + * Adjust the expected index for insertion. + */ + if (!state->inleaf) + blk2->index = blk1->index - INT_GET(leaf1->hdr.count, ARCH_CONVERT); + + /* + * Finally sanity check just to make sure we are not returning a negative index + */ + if(blk2->index < 0) { + state->inleaf = 1; + blk2->index = 0; + cmn_err(CE_ALERT, + "xfs_dir2_leafn_rebalance: picked the wrong leaf? reverting orignal leaf: " + "blk1->index %d\n", + blk1->index); + } +} + +/* + * Remove an entry from a node directory. + * This removes the leaf entry and the data entry, + * and updates the free block if necessary. + */ +static int /* error */ +xfs_dir2_leafn_remove( + xfs_da_args_t *args, /* operation arguments */ + xfs_dabuf_t *bp, /* leaf buffer */ + int index, /* leaf entry index */ + xfs_da_state_blk_t *dblk, /* data block */ + int *rval) /* resulting block needs join */ +{ + xfs_dir2_data_t *data; /* data block structure */ + xfs_dir2_db_t db; /* data block number */ + xfs_dabuf_t *dbp; /* data block buffer */ + xfs_dir2_data_entry_t *dep; /* data block entry */ + xfs_inode_t *dp; /* incore directory inode */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + xfs_dir2_leaf_entry_t *lep; /* leaf entry */ + int longest; /* longest data free entry */ + int off; /* data block entry offset */ + xfs_mount_t *mp; /* filesystem mount point */ + int needlog; /* need to log data header */ + int needscan; /* need to rescan data frees */ + xfs_trans_t *tp; /* transaction pointer */ + + xfs_dir2_trace_args_sb("leafn_remove", args, index, bp); + dp = args->dp; + tp = args->trans; + mp = dp->i_mount; + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + /* + * Point to the entry we're removing. + */ + lep = &leaf->ents[index]; + /* + * Extract the data block and offset from the entry. + */ + db = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT)); + ASSERT(dblk->blkno == db); + off = XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT)); + ASSERT(dblk->index == off); + /* + * Kill the leaf entry by marking it stale. + * Log the leaf block changes. + */ + INT_MOD(leaf->hdr.stale, ARCH_CONVERT, +1); + xfs_dir2_leaf_log_header(tp, bp); + INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR); + xfs_dir2_leaf_log_ents(tp, bp, index, index); + /* + * Make the data entry free. Keep track of the longest freespace + * in the data block in case it changes. + */ + dbp = dblk->bp; + data = dbp->data; + dep = (xfs_dir2_data_entry_t *)((char *)data + off); + longest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT); + needlog = needscan = 0; + xfs_dir2_data_make_free(tp, dbp, off, + XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan); + /* + * Rescan the data block freespaces for bestfree. + * Log the data block header if needed. + */ + if (needscan) + xfs_dir2_data_freescan(mp, data, &needlog, NULL); + if (needlog) + xfs_dir2_data_log_header(tp, dbp); + xfs_dir2_data_check(dp, dbp); + /* + * If the longest data block freespace changes, need to update + * the corresponding freeblock entry. + */ + if (longest < INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) { + int error; /* error return value */ + xfs_dabuf_t *fbp; /* freeblock buffer */ + xfs_dir2_db_t fdb; /* freeblock block number */ + int findex; /* index in freeblock entries */ + xfs_dir2_free_t *free; /* freeblock structure */ + int logfree; /* need to log free entry */ + + /* + * Convert the data block number to a free block, + * read in the free block. + */ + fdb = XFS_DIR2_DB_TO_FDB(mp, db); + if ((error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, fdb), + -1, &fbp, XFS_DATA_FORK))) { + return error; + } + free = fbp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + ASSERT(INT_GET(free->hdr.firstdb, ARCH_CONVERT) == + XFS_DIR2_MAX_FREE_BESTS(mp) * + (fdb - XFS_DIR2_FREE_FIRSTDB(mp))); + /* + * Calculate which entry we need to fix. + */ + findex = XFS_DIR2_DB_TO_FDINDEX(mp, db); + longest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT); + /* + * If the data block is now empty we can get rid of it + * (usually). + */ + if (longest == mp->m_dirblksize - (uint)sizeof(data->hdr)) { + /* + * Try to punch out the data block. + */ + error = xfs_dir2_shrink_inode(args, db, dbp); + if (error == 0) { + dblk->bp = NULL; + data = NULL; + } + /* + * We can get ENOSPC if there's no space reservation. + * In this case just drop the buffer and some one else + * will eventually get rid of the empty block. + */ + else if (error == ENOSPC && args->total == 0) + xfs_da_buf_done(dbp); + else + return error; + } + /* + * If we got rid of the data block, we can eliminate that entry + * in the free block. + */ + if (data == NULL) { + /* + * One less used entry in the free table. + */ + INT_MOD(free->hdr.nused, ARCH_CONVERT, -1); + xfs_dir2_free_log_header(tp, fbp); + /* + * If this was the last entry in the table, we can + * trim the table size back. There might be other + * entries at the end referring to non-existent + * data blocks, get those too. + */ + if (findex == INT_GET(free->hdr.nvalid, ARCH_CONVERT) - 1) { + int i; /* free entry index */ + + for (i = findex - 1; + i >= 0 && INT_GET(free->bests[i], ARCH_CONVERT) == NULLDATAOFF; + i--) + continue; + INT_SET(free->hdr.nvalid, ARCH_CONVERT, i + 1); + logfree = 0; + } + /* + * Not the last entry, just punch it out. + */ + else { + INT_SET(free->bests[findex], ARCH_CONVERT, NULLDATAOFF); + logfree = 1; + } + /* + * If there are no useful entries left in the block, + * get rid of the block if we can. + */ + if (!free->hdr.nused) { + error = xfs_dir2_shrink_inode(args, fdb, fbp); + if (error == 0) { + fbp = NULL; + logfree = 0; + } else if (error != ENOSPC || args->total != 0) + return error; + /* + * It's possible to get ENOSPC if there is no + * space reservation. In this case some one + * else will eventually get rid of this block. + */ + } + } + /* + * Data block is not empty, just set the free entry to + * the new value. + */ + else { + INT_SET(free->bests[findex], ARCH_CONVERT, longest); + logfree = 1; + } + /* + * Log the free entry that changed, unless we got rid of it. + */ + if (logfree) + xfs_dir2_free_log_bests(tp, fbp, findex, findex); + /* + * Drop the buffer if we still have it. + */ + if (fbp) + xfs_da_buf_done(fbp); + } + xfs_dir2_leafn_check(dp, bp); + /* + * Return indication of whether this leaf block is emtpy enough + * to justify trying to join it with a neighbor. + */ + *rval = + ((uint)sizeof(leaf->hdr) + + (uint)sizeof(leaf->ents[0]) * + (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT))) < + mp->m_dir_magicpct; + return 0; +} + +/* + * Split the leaf entries in the old block into old and new blocks. + */ +int /* error */ +xfs_dir2_leafn_split( + xfs_da_state_t *state, /* btree cursor */ + xfs_da_state_blk_t *oldblk, /* original block */ + xfs_da_state_blk_t *newblk) /* newly created block */ +{ + xfs_da_args_t *args; /* operation arguments */ + xfs_dablk_t blkno; /* new leaf block number */ + int error; /* error return value */ + xfs_mount_t *mp; /* filesystem mount point */ + + /* + * Allocate space for a new leaf node. + */ + args = state->args; + mp = args->dp->i_mount; + ASSERT(args != NULL); + ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC); + error = xfs_da_grow_inode(args, &blkno); + if (error) { + return error; + } + /* + * Initialize the new leaf block. + */ + error = xfs_dir2_leaf_init(args, XFS_DIR2_DA_TO_DB(mp, blkno), + &newblk->bp, XFS_DIR2_LEAFN_MAGIC); + if (error) { + return error; + } + newblk->blkno = blkno; + newblk->magic = XFS_DIR2_LEAFN_MAGIC; + /* + * Rebalance the entries across the two leaves, link the new + * block into the leaves. + */ + xfs_dir2_leafn_rebalance(state, oldblk, newblk); + error = xfs_da_blk_link(state, oldblk, newblk); + if (error) { + return error; + } + /* + * Insert the new entry in the correct block. + */ + if (state->inleaf) + error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index); + else + error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index); + /* + * Update last hashval in each block since we added the name. + */ + oldblk->hashval = xfs_dir2_leafn_lasthash(oldblk->bp, NULL); + newblk->hashval = xfs_dir2_leafn_lasthash(newblk->bp, NULL); + xfs_dir2_leafn_check(args->dp, oldblk->bp); + xfs_dir2_leafn_check(args->dp, newblk->bp); + return error; +} + +/* + * 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. + */ +int /* error */ +xfs_dir2_leafn_toosmall( + xfs_da_state_t *state, /* btree cursor */ + int *action) /* resulting action to take */ +{ + xfs_da_state_blk_t *blk; /* leaf block */ + xfs_dablk_t blkno; /* leaf block number */ + xfs_dabuf_t *bp; /* leaf buffer */ + int bytes; /* bytes in use */ + int count; /* leaf live entry count */ + int error; /* error return value */ + int forward; /* sibling block direction */ + int i; /* sibling counter */ + xfs_da_blkinfo_t *info; /* leaf block header */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + int rval; /* result from path_shift */ + + /* + * 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_DIR2_LEAFN_MAGIC); + leaf = (xfs_dir2_leaf_t *)info; + count = INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT); + bytes = (uint)sizeof(leaf->hdr) + count * (uint)sizeof(leaf->ents[0]); + if (bytes > (state->blocksize >> 1)) { + /* + * Blk over 50%, don't try to join. + */ + *action = 0; + 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 (arbitrarily) + * 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, + &rval); + if (error) + return error; + *action = rval ? 2 : 0; + 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 a directory over time. + */ + forward = INT_GET(info->forw, ARCH_CONVERT) < INT_GET(info->back, ARCH_CONVERT); + for (i = 0, bp = NULL; i < 2; forward = !forward, i++) { + blkno = forward ?INT_GET( info->forw, ARCH_CONVERT) : INT_GET(info->back, ARCH_CONVERT); + if (blkno == 0) + continue; + /* + * Read the sibling leaf block. + */ + if ((error = + xfs_da_read_buf(state->args->trans, state->args->dp, blkno, + -1, &bp, XFS_DATA_FORK))) { + return error; + } + ASSERT(bp != NULL); + /* + * Count bytes in the two blocks combined. + */ + leaf = (xfs_dir2_leaf_t *)info; + count = INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT); + bytes = state->blocksize - (state->blocksize >> 2); + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + count += INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT); + bytes -= count * (uint)sizeof(leaf->ents[0]); + /* + * Fits with at least 25% to spare. + */ + if (bytes >= 0) + break; + xfs_da_brelse(state->args->trans, bp); + } + /* + * Didn't like either block, give up. + */ + if (i >= 2) { + *action = 0; + return 0; + } + /* + * Done with the sibling leaf block here, drop the dabuf + * so path_shift can get it. + */ + xfs_da_buf_done(bp); + /* + * 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, + &rval); + else + error = xfs_da_path_shift(state, &state->path, forward, 0, + &rval); + if (error) { + return error; + } + *action = rval ? 0 : 1; + return 0; +} + +/* + * Move all the leaf entries from drop_blk to save_blk. + * This is done as part of a join operation. + */ +void +xfs_dir2_leafn_unbalance( + xfs_da_state_t *state, /* cursor */ + xfs_da_state_blk_t *drop_blk, /* dead block */ + xfs_da_state_blk_t *save_blk) /* surviving block */ +{ + xfs_da_args_t *args; /* operation arguments */ + xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */ + xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */ + + args = state->args; + ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC); + ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC); + drop_leaf = drop_blk->bp->data; + save_leaf = save_blk->bp->data; + ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC); + /* + * If there are any stale leaf entries, take this opportunity + * to purge them. + */ + if (INT_GET(drop_leaf->hdr.stale, ARCH_CONVERT)) + xfs_dir2_leaf_compact(args, drop_blk->bp); + if (INT_GET(save_leaf->hdr.stale, ARCH_CONVERT)) + xfs_dir2_leaf_compact(args, save_blk->bp); + /* + * Move the entries from drop to the appropriate end of save. + */ + drop_blk->hashval = INT_GET(drop_leaf->ents[INT_GET(drop_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); + if (xfs_dir2_leafn_order(save_blk->bp, drop_blk->bp)) + xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, 0, + INT_GET(drop_leaf->hdr.count, ARCH_CONVERT)); + else + xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, + INT_GET(save_leaf->hdr.count, ARCH_CONVERT), INT_GET(drop_leaf->hdr.count, ARCH_CONVERT)); + save_blk->hashval = INT_GET(save_leaf->ents[INT_GET(save_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT); + xfs_dir2_leafn_check(args->dp, save_blk->bp); +} + +/* + * Top-level node form directory addname routine. + */ +int /* error */ +xfs_dir2_node_addname( + xfs_da_args_t *args) /* operation arguments */ +{ + xfs_da_state_blk_t *blk; /* leaf block for insert */ + int error; /* error return value */ + int rval; /* sub-return value */ + xfs_da_state_t *state; /* btree cursor */ + + xfs_dir2_trace_args("node_addname", args); + /* + * Allocate and initialize the state (btree cursor). + */ + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_dirblksize; + state->node_ents = state->mp->m_dir_node_ents; + /* + * Look up the name. We're not supposed to find it, but + * this gives us the insertion point. + */ + error = xfs_da_node_lookup_int(state, &rval); + if (error) + rval = error; + if (rval != ENOENT) { + goto done; + } + /* + * Add the data entry to a data block. + * Extravalid is set to a freeblock found by lookup. + */ + rval = xfs_dir2_node_addname_int(args, + state->extravalid ? &state->extrablk : NULL); + if (rval) { + goto done; + } + blk = &state->path.blk[state->path.active - 1]; + ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); + /* + * Add the new leaf entry. + */ + rval = xfs_dir2_leafn_add(blk->bp, args, blk->index); + if (rval == 0) { + /* + * It worked, fix the hash values up the btree. + */ + if (!args->justcheck) + xfs_da_fixhashpath(state, &state->path); + } else { + /* + * It didn't work, we need to split the leaf block. + */ + if (args->total == 0) { + ASSERT(rval == ENOSPC); + goto done; + } + /* + * Split the leaf block and insert the new entry. + */ + rval = xfs_da_split(state); + } +done: + xfs_da_state_free(state); + return rval; +} + +/* + * Add the data entry for a node-format directory name addition. + * The leaf entry is added in xfs_dir2_leafn_add. + * We may enter with a freespace block that the lookup found. + */ +static int /* error */ +xfs_dir2_node_addname_int( + xfs_da_args_t *args, /* operation arguments */ + xfs_da_state_blk_t *fblk) /* optional freespace block */ +{ + xfs_dir2_data_t *data; /* data block structure */ + xfs_dir2_db_t dbno; /* data block number */ + xfs_dabuf_t *dbp; /* data block buffer */ + xfs_dir2_data_entry_t *dep; /* data entry pointer */ + xfs_inode_t *dp; /* incore directory inode */ + xfs_dir2_data_unused_t *dup; /* data unused entry pointer */ + int error; /* error return value */ + xfs_dir2_db_t fbno; /* freespace block number */ + xfs_dabuf_t *fbp; /* freespace buffer */ + int findex; /* freespace entry index */ + xfs_dir2_free_t *free=NULL; /* freespace block structure */ + xfs_dir2_db_t ifbno; /* initial freespace block no */ + xfs_dir2_db_t lastfbno=0; /* highest freespace block no */ + int length; /* length of the new entry */ + int logfree; /* need to log free entry */ + xfs_mount_t *mp; /* filesystem mount point */ + int needlog; /* need to log data header */ + int needscan; /* need to rescan data frees */ + xfs_dir2_data_off_t *tagp; /* data entry tag pointer */ + xfs_trans_t *tp; /* transaction pointer */ + + dp = args->dp; + mp = dp->i_mount; + tp = args->trans; + length = XFS_DIR2_DATA_ENTSIZE(args->namelen); + /* + * If we came in with a freespace block that means that lookup + * found an entry with our hash value. This is the freespace + * block for that data entry. + */ + if (fblk) { + fbp = fblk->bp; + /* + * Remember initial freespace block number. + */ + ifbno = fblk->blkno; + free = fbp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + findex = fblk->index; + /* + * This means the free entry showed that the data block had + * space for our entry, so we remembered it. + * Use that data block. + */ + if (findex >= 0) { + ASSERT(findex < INT_GET(free->hdr.nvalid, ARCH_CONVERT)); + ASSERT(INT_GET(free->bests[findex], ARCH_CONVERT) != NULLDATAOFF); + ASSERT(INT_GET(free->bests[findex], ARCH_CONVERT) >= length); + dbno = INT_GET(free->hdr.firstdb, ARCH_CONVERT) + findex; + } + /* + * The data block looked at didn't have enough room. + * We'll start at the beginning of the freespace entries. + */ + else { + dbno = -1; + findex = 0; + } + } + /* + * Didn't come in with a freespace block, so don't have a data block. + */ + else { + ifbno = dbno = -1; + fbp = NULL; + findex = 0; + } + /* + * If we don't have a data block yet, we're going to scan the + * freespace blocks looking for one. Figure out what the + * highest freespace block number is. + */ + if (dbno == -1) { + xfs_fileoff_t fo; /* freespace block number */ + + if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) + return error; + lastfbno = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)fo); + fbno = ifbno; + } + /* + * While we haven't identified a data block, search the freeblock + * data for a good data block. If we find a null freeblock entry, + * indicating a hole in the data blocks, remember that. + */ + while (dbno == -1) { + /* + * If we don't have a freeblock in hand, get the next one. + */ + if (fbp == NULL) { + /* + * Happens the first time through unless lookup gave + * us a freespace block to start with. + */ + if (++fbno == 0) + fbno = XFS_DIR2_FREE_FIRSTDB(mp); + /* + * If it's ifbno we already looked at it. + */ + if (fbno == ifbno) + fbno++; + /* + * If it's off the end we're done. + */ + if (fbno >= lastfbno) + break; + /* + * Read the block. There can be holes in the + * freespace blocks, so this might not succeed. + * This should be really rare, so there's no reason + * to avoid it. + */ + if ((error = xfs_da_read_buf(tp, dp, + XFS_DIR2_DB_TO_DA(mp, fbno), -2, &fbp, + XFS_DATA_FORK))) { + return error; + } + if (unlikely(fbp == NULL)) { + continue; + } + free = fbp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + findex = 0; + } + /* + * Look at the current free entry. Is it good enough? + */ + if (INT_GET(free->bests[findex], ARCH_CONVERT) != NULLDATAOFF && + INT_GET(free->bests[findex], ARCH_CONVERT) >= length) + dbno = INT_GET(free->hdr.firstdb, ARCH_CONVERT) + findex; + else { + /* + * Are we done with the freeblock? + */ + if (++findex == INT_GET(free->hdr.nvalid, ARCH_CONVERT)) { + /* + * Drop the block. + */ + xfs_da_brelse(tp, fbp); + fbp = NULL; + if (fblk && fblk->bp) + fblk->bp = NULL; + } + } + } + /* + * If we don't have a data block, we need to allocate one and make + * the freespace entries refer to it. + */ + if (unlikely(dbno == -1)) { + /* + * Not allowed to allocate, return failure. + */ + if (args->justcheck || args->total == 0) { + /* + * Drop the freespace buffer unless it came from our + * caller. + */ + if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) + xfs_da_buf_done(fbp); + return XFS_ERROR(ENOSPC); + } + /* + * Allocate and initialize the new data block. + */ + if (unlikely((error = xfs_dir2_grow_inode(args, + XFS_DIR2_DATA_SPACE, + &dbno)) || + (error = xfs_dir2_data_init(args, dbno, &dbp)))) { + /* + * Drop the freespace buffer unless it came from our + * caller. + */ + if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) + xfs_da_buf_done(fbp); + return error; + } + /* + * If (somehow) we have a freespace block, get rid of it. + */ + if (fbp) + xfs_da_brelse(tp, fbp); + if (fblk && fblk->bp) + fblk->bp = NULL; + + /* + * Get the freespace block corresponding to the data block + * that was just allocated. + */ + fbno = XFS_DIR2_DB_TO_FDB(mp, dbno); + if (unlikely(error = xfs_da_read_buf(tp, dp, + XFS_DIR2_DB_TO_DA(mp, fbno), -2, &fbp, + XFS_DATA_FORK))) { + xfs_da_buf_done(dbp); + return error; + } + /* + * If there wasn't a freespace block, the read will + * return a NULL fbp. Allocate and initialize a new one. + */ + if( fbp == NULL ) { + if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, + &fbno))) { + return error; + } + + if (unlikely(XFS_DIR2_DB_TO_FDB(mp, dbno) != fbno)) { + cmn_err(CE_ALERT, + "xfs_dir2_node_addname_int: dir ino " + "%llu needed freesp block %lld for\n" + " data block %lld, got %lld\n" + " ifbno %llu lastfbno %d\n", + (unsigned long long)dp->i_ino, + (long long)XFS_DIR2_DB_TO_FDB(mp, dbno), + (long long)dbno, (long long)fbno, + (unsigned long long)ifbno, lastfbno); + if (fblk) { + cmn_err(CE_ALERT, + " fblk 0x%p blkno %llu " + "index %d magic 0x%x\n", + fblk, + (unsigned long long)fblk->blkno, + fblk->index, + fblk->magic); + } else { + cmn_err(CE_ALERT, + " ... fblk is NULL\n"); + } + XFS_ERROR_REPORT("xfs_dir2_node_addname_int", + XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + + /* + * Get a buffer for the new block. + */ + if ((error = xfs_da_get_buf(tp, dp, + XFS_DIR2_DB_TO_DA(mp, fbno), + -1, &fbp, XFS_DATA_FORK))) { + return error; + } + ASSERT(fbp != NULL); + + /* + * Initialize the new block to be empty, and remember + * its first slot as our empty slot. + */ + free = fbp->data; + INT_SET(free->hdr.magic, ARCH_CONVERT, XFS_DIR2_FREE_MAGIC); + INT_SET(free->hdr.firstdb, ARCH_CONVERT, + (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) * + XFS_DIR2_MAX_FREE_BESTS(mp)); + free->hdr.nvalid = 0; + free->hdr.nused = 0; + } else { + free = fbp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + } + + /* + * Set the freespace block index from the data block number. + */ + findex = XFS_DIR2_DB_TO_FDINDEX(mp, dbno); + /* + * If it's after the end of the current entries in the + * freespace block, extend that table. + */ + if (findex >= INT_GET(free->hdr.nvalid, ARCH_CONVERT)) { + ASSERT(findex < XFS_DIR2_MAX_FREE_BESTS(mp)); + INT_SET(free->hdr.nvalid, ARCH_CONVERT, findex + 1); + /* + * Tag new entry so nused will go up. + */ + INT_SET(free->bests[findex], ARCH_CONVERT, NULLDATAOFF); + } + /* + * If this entry was for an empty data block + * (this should always be true) then update the header. + */ + if (INT_GET(free->bests[findex], ARCH_CONVERT) == NULLDATAOFF) { + INT_MOD(free->hdr.nused, ARCH_CONVERT, +1); + xfs_dir2_free_log_header(tp, fbp); + } + /* + * Update the real value in the table. + * We haven't allocated the data entry yet so this will + * change again. + */ + data = dbp->data; + INT_COPY(free->bests[findex], data->hdr.bestfree[0].length, ARCH_CONVERT); + logfree = 1; + } + /* + * We had a data block so we don't have to make a new one. + */ + else { + /* + * If just checking, we succeeded. + */ + if (args->justcheck) { + if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) + xfs_da_buf_done(fbp); + return 0; + } + /* + * Read the data block in. + */ + if (unlikely( + error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, dbno), + -1, &dbp, XFS_DATA_FORK))) { + if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) + xfs_da_buf_done(fbp); + return error; + } + data = dbp->data; + logfree = 0; + } + ASSERT(INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) >= length); + /* + * Point to the existing unused space. + */ + dup = (xfs_dir2_data_unused_t *) + ((char *)data + INT_GET(data->hdr.bestfree[0].offset, ARCH_CONVERT)); + needscan = needlog = 0; + /* + * Mark the first part of the unused space, inuse for us. + */ + xfs_dir2_data_use_free(tp, dbp, dup, + (xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length, + &needlog, &needscan); + /* + * Fill in the new entry and log it. + */ + dep = (xfs_dir2_data_entry_t *)dup; + INT_SET(dep->inumber, ARCH_CONVERT, args->inumber); + dep->namelen = args->namelen; + memcpy(dep->name, args->name, dep->namelen); + tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep); + INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)data)); + xfs_dir2_data_log_entry(tp, dbp, dep); + /* + * Rescan the block for bestfree if needed. + */ + if (needscan) + xfs_dir2_data_freescan(mp, data, &needlog, NULL); + /* + * Log the data block header if needed. + */ + if (needlog) + xfs_dir2_data_log_header(tp, dbp); + /* + * If the freespace entry is now wrong, update it. + */ + if (INT_GET(free->bests[findex], ARCH_CONVERT) != INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) { + INT_COPY(free->bests[findex], data->hdr.bestfree[0].length, ARCH_CONVERT); + logfree = 1; + } + /* + * Log the freespace entry if needed. + */ + if (logfree) + xfs_dir2_free_log_bests(tp, fbp, findex, findex); + /* + * If the caller didn't hand us the freespace block, drop it. + */ + if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) + xfs_da_buf_done(fbp); + /* + * Return the data block and offset in args, then drop the data block. + */ + args->blkno = (xfs_dablk_t)dbno; + args->index = INT_GET(*tagp, ARCH_CONVERT); + xfs_da_buf_done(dbp); + return 0; +} + +/* + * Lookup an entry in a node-format directory. + * All the real work happens in xfs_da_node_lookup_int. + * The only real output is the inode number of the entry. + */ +int /* error */ +xfs_dir2_node_lookup( + xfs_da_args_t *args) /* operation arguments */ +{ + int error; /* error return value */ + int i; /* btree level */ + int rval; /* operation return value */ + xfs_da_state_t *state; /* btree cursor */ + + xfs_dir2_trace_args("node_lookup", args); + /* + * Allocate and initialize the btree cursor. + */ + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_dirblksize; + state->node_ents = state->mp->m_dir_node_ents; + /* + * Fill in the path to the entry in the cursor. + */ + error = xfs_da_node_lookup_int(state, &rval); + if (error) + rval = error; + /* + * Release the btree blocks and leaf block. + */ + for (i = 0; i < state->path.active; i++) { + xfs_da_brelse(args->trans, state->path.blk[i].bp); + state->path.blk[i].bp = NULL; + } + /* + * Release the data block if we have it. + */ + if (state->extravalid && state->extrablk.bp) { + xfs_da_brelse(args->trans, state->extrablk.bp); + state->extrablk.bp = NULL; + } + xfs_da_state_free(state); + return rval; +} + +/* + * Remove an entry from a node-format directory. + */ +int /* error */ +xfs_dir2_node_removename( + xfs_da_args_t *args) /* operation arguments */ +{ + xfs_da_state_blk_t *blk; /* leaf block */ + int error; /* error return value */ + int rval; /* operation return value */ + xfs_da_state_t *state; /* btree cursor */ + + xfs_dir2_trace_args("node_removename", args); + /* + * Allocate and initialize the btree cursor. + */ + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_dirblksize; + state->node_ents = state->mp->m_dir_node_ents; + /* + * Look up the entry we're deleting, set up the cursor. + */ + error = xfs_da_node_lookup_int(state, &rval); + if (error) { + rval = error; + } + /* + * Didn't find it, upper layer screwed up. + */ + if (rval != EEXIST) { + xfs_da_state_free(state); + return rval; + } + blk = &state->path.blk[state->path.active - 1]; + ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); + ASSERT(state->extravalid); + /* + * Remove the leaf and data entries. + * Extrablk refers to the data block. + */ + error = xfs_dir2_leafn_remove(args, blk->bp, blk->index, + &state->extrablk, &rval); + if (error) { + return error; + } + /* + * Fix the hash values up the btree. + */ + xfs_da_fixhashpath(state, &state->path); + /* + * If we need to join leaf blocks, do it. + */ + if (rval && state->path.active > 1) + error = xfs_da_join(state); + /* + * If no errors so far, try conversion to leaf format. + */ + if (!error) + error = xfs_dir2_node_to_leaf(state); + xfs_da_state_free(state); + return error; +} + +/* + * Replace an entry's inode number in a node-format directory. + */ +int /* error */ +xfs_dir2_node_replace( + xfs_da_args_t *args) /* operation arguments */ +{ + xfs_da_state_blk_t *blk; /* leaf block */ + xfs_dir2_data_t *data; /* data block structure */ + xfs_dir2_data_entry_t *dep; /* data entry changed */ + int error; /* error return value */ + int i; /* btree level */ + xfs_ino_t inum; /* new inode number */ + xfs_dir2_leaf_t *leaf; /* leaf structure */ + xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */ + int rval; /* internal return value */ + xfs_da_state_t *state; /* btree cursor */ + + xfs_dir2_trace_args("node_replace", args); + /* + * Allocate and initialize the btree cursor. + */ + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_dirblksize; + state->node_ents = state->mp->m_dir_node_ents; + inum = args->inumber; + /* + * Lookup the entry to change in the btree. + */ + error = xfs_da_node_lookup_int(state, &rval); + if (error) { + rval = error; + } + /* + * It should be found, since the vnodeops layer has looked it up + * and locked it. But paranoia is good. + */ + if (rval == EEXIST) { + /* + * Find the leaf entry. + */ + blk = &state->path.blk[state->path.active - 1]; + ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); + leaf = blk->bp->data; + lep = &leaf->ents[blk->index]; + ASSERT(state->extravalid); + /* + * Point to the data entry. + */ + data = state->extrablk.bp->data; + ASSERT(INT_GET(data->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC); + dep = (xfs_dir2_data_entry_t *) + ((char *)data + + XFS_DIR2_DATAPTR_TO_OFF(state->mp, INT_GET(lep->address, ARCH_CONVERT))); + ASSERT(inum != INT_GET(dep->inumber, ARCH_CONVERT)); + /* + * Fill in the new inode number and log the entry. + */ + INT_SET(dep->inumber, ARCH_CONVERT, inum); + xfs_dir2_data_log_entry(args->trans, state->extrablk.bp, dep); + rval = 0; + } + /* + * Didn't find it, and we're holding a data block. Drop it. + */ + else if (state->extravalid) { + xfs_da_brelse(args->trans, state->extrablk.bp); + state->extrablk.bp = NULL; + } + /* + * Release all the buffers in the cursor. + */ + for (i = 0; i < state->path.active; i++) { + xfs_da_brelse(args->trans, state->path.blk[i].bp); + state->path.blk[i].bp = NULL; + } + xfs_da_state_free(state); + return rval; +} + +/* + * Trim off a trailing empty freespace block. + * Return (in rvalp) 1 if we did it, 0 if not. + */ +int /* error */ +xfs_dir2_node_trim_free( + xfs_da_args_t *args, /* operation arguments */ + xfs_fileoff_t fo, /* free block number */ + int *rvalp) /* out: did something */ +{ + xfs_dabuf_t *bp; /* freespace buffer */ + xfs_inode_t *dp; /* incore directory inode */ + int error; /* error return code */ + xfs_dir2_free_t *free; /* freespace structure */ + xfs_mount_t *mp; /* filesystem mount point */ + xfs_trans_t *tp; /* transaction pointer */ + + dp = args->dp; + mp = dp->i_mount; + tp = args->trans; + /* + * Read the freespace block. + */ + if (unlikely(error = xfs_da_read_buf(tp, dp, (xfs_dablk_t)fo, -2, &bp, + XFS_DATA_FORK))) { + return error; + } + + /* + * There can be holes in freespace. If fo is a hole, there's + * nothing to do. + */ + if (bp == NULL) { + return 0; + } + free = bp->data; + ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC); + /* + * If there are used entries, there's nothing to do. + */ + if (INT_GET(free->hdr.nused, ARCH_CONVERT) > 0) { + xfs_da_brelse(tp, bp); + *rvalp = 0; + return 0; + } + /* + * Blow the block away. + */ + if ((error = + xfs_dir2_shrink_inode(args, XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)fo), + bp))) { + /* + * Can't fail with ENOSPC since that only happens with no + * space reservation, when breaking up an extent into two + * pieces. This is the last block of an extent. + */ + ASSERT(error != ENOSPC); + xfs_da_brelse(tp, bp); + return error; + } + /* + * Return that we succeeded. + */ + *rvalp = 1; + return 0; +} |
