/* * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms 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. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_mount.h" #include "xfs_da_btree.h" #include "xfs_bmap_btree.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_dir2_format.h" #include "xfs_dir2_priv.h" #include "xfs_error.h" #include "xfs_trace.h" /* * Local function declarations. */ #ifdef DEBUG static void xfs_dir2_leaf_check(xfs_inode_t *dp, xfs_dabuf_t *bp); #else #define xfs_dir2_leaf_check(dp, bp) #endif static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **lbpp, int *indexp, xfs_dabuf_t **dbpp); static void xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, int first, int last); static void xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_dabuf *bp); /* * Convert a block form directory to a leaf form directory. */ int /* error */ xfs_dir2_block_to_leaf( xfs_da_args_t *args, /* operation arguments */ xfs_dabuf_t *dbp) /* input block's buffer */ { __be16 *bestsp; /* leaf's bestsp entries */ xfs_dablk_t blkno; /* leaf block's bno */ xfs_dir2_data_hdr_t *hdr; /* block header */ xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */ xfs_dir2_block_tail_t *btp; /* block's tail */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ xfs_dabuf_t *lbp; /* leaf block's buffer */ xfs_dir2_db_t ldb; /* leaf block's bno */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */ xfs_mount_t *mp; /* filesystem mount point */ int needlog; /* need to log block header */ int needscan; /* need to rescan bestfree */ xfs_trans_t *tp; /* transaction pointer */ trace_xfs_dir2_block_to_leaf(args); dp = args->dp; mp = dp->i_mount; tp = args->trans; /* * Add the leaf block to the inode. * This interface will only put blocks in the leaf/node range. * Since that's empty now, we'll get the root (block 0 in range). */ if ((error = xfs_da_grow_inode(args, &blkno))) { return error; } ldb = xfs_dir2_da_to_db(mp, blkno); ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp)); /* * Initialize the leaf block, get a buffer for it. */ if ((error = xfs_dir2_leaf_init(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC))) { return error; } ASSERT(lbp != NULL); leaf = lbp->data; hdr = dbp->data; xfs_dir2_data_check(dp, dbp); btp = xfs_dir2_block_tail_p(mp, hdr); blp = xfs_dir2_block_leaf_p(btp); /* * Set the counts in the leaf header. */ leaf->hdr.count = cpu_to_be16(be32_to_cpu(btp->count)); leaf->hdr.stale = cpu_to_be16(be32_to_cpu(btp->stale)); /* * Could compact these but I think we always do the conversion * after squeezing out stale entries. */ memcpy(leaf->ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t)); xfs_dir2_leaf_log_ents(tp, lbp, 0, be16_to_cpu(leaf->hdr.count) - 1); needscan = 0; needlog = 1; /* * Make the space formerly occupied by the leaf entries and block * tail be free. */ xfs_dir2_data_make_free(tp, dbp, (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr), (xfs_dir2_data_aoff_t)((char *)hdr + mp->m_dirblksize - (char *)blp), &needlog, &needscan); /* * Fix up the block header, make it a data block. */ hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC); if (needscan) xfs_dir2_data_freescan(mp, hdr, &needlog); /* * Set up leaf tail and bests table. */ ltp = xfs_dir2_leaf_tail_p(mp, leaf); ltp->bestcount = cpu_to_be32(1); bestsp = xfs_dir2_leaf_bests_p(ltp); bestsp[0] = hdr->bestfree[0].length; /* * Log the data header and leaf bests table. */ if (needlog) xfs_dir2_data_log_header(tp, dbp); xfs_dir2_leaf_check(dp, lbp); xfs_dir2_data_check(dp, dbp); xfs_dir2_leaf_log_bests(tp, lbp, 0, 0); xfs_da_buf_done(lbp); return 0; } struct xfs_dir2_leaf_entry * xfs_dir2_leaf_find_entry( xfs_dir2_leaf_t *leaf, /* leaf structure */ int index, /* leaf table position */ int compact, /* need to compact leaves */ int lowstale, /* index of prev stale leaf */ int highstale, /* index of next stale leaf */ int *lfloglow, /* low leaf logging index */ int *lfloghigh) /* high leaf logging index */ { if (!leaf->hdr.stale) { xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */ /* * Now we need to make room to insert the leaf entry. * * If there are no stale entries, just insert a hole at index. */ lep = &leaf->ents[index]; if (index < be16_to_cpu(leaf->hdr.count)) memmove(lep + 1, lep, (be16_to_cpu(leaf->hdr.count) - index) * sizeof(*lep)); /* * Record low and high logging indices for the leaf. */ *lfloglow = index; *lfloghigh = be16_to_cpu(leaf->hdr.count); be16_add_cpu(&leaf->hdr.count, 1); return lep; } /* * There are stale entries. * * We will use one of them for the new entry. It's probably not at * the right location, so we'll have to shift some up or down first. * * If we didn't compact before, we need to find the nearest stale * entries before and after our insertion point. */ if (compact == 0) { /* * Find the first stale entry before the insertion point, * if any. */ for (lowstale = index - 1; lowstale >= 0 && leaf->ents[lowstale].address != cpu_to_be32(XFS_DIR2_NULL_DATAPTR); lowstale--) continue; /* * Find the next stale entry at or after the insertion point, * if any. Stop if we go so far that the lowstale entry * would be better. */ for (highstale = index; highstale < be16_to_cpu(leaf->hdr.count) && leaf->ents[highstale].address != cpu_to_be32(XFS_DIR2_NULL_DATAPTR) && (lowstale < 0 || index - lowstale - 1 >= highstale - index); highstale++) continue; } /* * If the low one is better, use it. */ if (lowstale >= 0 && (highstale == be16_to_cpu(leaf->hdr.count) || index - lowstale - 1 < highstale - index)) { ASSERT(index - lowstale - 1 >= 0); ASSERT(leaf->ents[lowstale].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)); /* * Copy entries up to cover the stale entry and make room * for the new entry. */ if (index - lowstale - 1 > 0) { memmove(&leaf->ents[lowstale], &leaf->ents[lowstale + 1], (index - lowstale - 1) * sizeof(xfs_dir2_leaf_entry_t)); } *lfloglow = MIN(lowstale, *lfloglow); *lfloghigh = MAX(index - 1, *lfloghigh); be16_add_cpu(&leaf->hdr.stale, -1); return &leaf->ents[index - 1]; } /* * The high one is better, so use that one. */ ASSERT(highstale - index >= 0); ASSERT(leaf->ents[highstale].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)); /* * Copy entries down to cover the stale entry and make room for the * new entry. */ if (highstale - index > 0) { memmove(&leaf->ents[index + 1], &leaf->ents[index], (highstale - index) * sizeof(xfs_dir2_leaf_entry_t)); } *lfloglow = MIN(index, *lfloglow); *lfloghigh = MAX(highstale, *lfloghigh); be16_add_cpu(&leaf->hdr.stale, -1); return &leaf->ents[index]; } /* * Add an entry to a leaf form directory. */ int /* error */ xfs_dir2_leaf_addname( xfs_da_args_t *args) /* operation arguments */ { __be16 *bestsp; /* freespace table in leaf */ int compact; /* need to compact leaves */ xfs_dir2_data_hdr_t *hdr; /* data block header */ 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_data_unused_t *dup; /* data unused entry */ int error; /* error return value */ int grown; /* allocated new data block */ int highstale; /* index of next stale leaf */ int i; /* temporary, index */ int index; /* leaf table position */ xfs_dabuf_t *lbp; /* leaf's buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ int length; /* length of new entry */ xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */ int lfloglow; /* low leaf logging index */ int lfloghigh; /* high leaf logging index */ int lowstale; /* index of prev stale leaf */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */ xfs_mount_t *mp; /* filesystem mount point */ int needbytes; /* leaf block bytes needed */ int needlog; /* need to log data header */ int needscan; /* need to rescan data free */ __be16 *tagp; /* end of data entry */ xfs_trans_t *tp; /* transaction pointer */ xfs_dir2_db_t use_block; /* data block number */ trace_xfs_dir2_leaf_addname(args); dp = args->dp; tp = args->trans; mp = dp->i_mount; /* * Read the leaf block. */ error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp, XFS_DATA_FORK); if (error) { return error; } ASSERT(lbp != NULL); /* * Look up the entry by hash value and name. * We know it's not there, our caller has already done a lookup. * So the index is of the entry to insert in front of. * But if there are dup hash values the index is of the first of those. */ index = xfs_dir2_leaf_search_hash(args, lbp); leaf = lbp->data; ltp = xfs_dir2_leaf_tail_p(mp, leaf); bestsp = xfs_dir2_leaf_bests_p(ltp); length = xfs_dir2_data_entsize(args->namelen); /* * See if there are any entries with the same hash value * and space in their block for the new entry. * This is good because it puts multiple same-hash value entries * in a data block, improving the lookup of those entries. */ for (use_block = -1, lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval; index++, lep++) { if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) continue; i = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); ASSERT(i < be32_to_cpu(ltp->bestcount)); ASSERT(bestsp[i] != cpu_to_be16(NULLDATAOFF)); if (be16_to_cpu(bestsp[i]) >= length) { use_block = i; break; } } /* * Didn't find a block yet, linear search all the data blocks. */ if (use_block == -1) { for (i = 0; i < be32_to_cpu(ltp->bestcount); i++) { /* * Remember a block we see that's missing. */ if (bestsp[i] == cpu_to_be16(NULLDATAOFF) && use_block == -1) use_block = i; else if (be16_to_cpu(bestsp[i]) >= length) { use_block = i; break; } } } /* * How many bytes do we need in the leaf block? */ needbytes = 0; if (!leaf->hdr.stale) needbytes += sizeof(xfs_dir2_leaf_entry_t); if (use_block == -1) needbytes += sizeof(xfs_dir2_data_off_t); /* * Now kill use_block if it refers to a missing block, so we * can use it as an indication of allocation needed. */ if (use_block != -1 && bestsp[use_block] == cpu_to_be16(NULLDATAOFF)) use_block = -1; /* * If we don't have enough free bytes but we can make enough * by compacting out stale entries, we'll do that. */ if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] < needbytes && be16_to_cpu(leaf->hdr.stale) > 1) { compact = 1; } /* * Otherwise if we don't have enough free bytes we need to * convert to node form. */ else if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu( leaf->hdr.count)] < needbytes) { /* * Just checking or no space reservation, give up. */ if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0) { xfs_da_brelse(tp, lbp); return XFS_ERROR(ENOSPC); } /* * Convert to node form. */ error = xfs_dir2_leaf_to_node(args, lbp); xfs_da_buf_done(lbp); if (error) return error; /* * Then add the new entry. */ return xfs_dir2_node_addname(args); } /* * Otherwise it will fit without compaction. */ else compact = 0; /* * If just checking, then it will fit unless we needed to allocate * a new data block. */ if (args->op_flags & XFS_DA_OP_JUSTCHECK) { xfs_da_brelse(tp, lbp); return use_block == -1 ? XFS_ERROR(ENOSPC) : 0; } /* * If no allocations are allowed, return now before we've * changed anything. */ if (args->total == 0 && use_block == -1) { xfs_da_brelse(tp, lbp); return XFS_ERROR(ENOSPC); } /* * Need to compact the leaf entries, removing stale ones. * Leave one stale entry behind - the one closest to our * insertion index - and we'll shift that one to our insertion * point later. */ if (compact) { xfs_dir2_leaf_compact_x1(lbp, &index, &lowstale, &highstale, &lfloglow, &lfloghigh); } /* * There are stale entries, so we'll need log-low and log-high * impossibly bad values later. */ else if (be16_to_cpu(leaf->hdr.stale)) { lfloglow = be16_to_cpu(leaf->hdr.count); lfloghigh = -1; } /* * If there was no data block space found, we need to allocate * a new one. */ if (use_block == -1) { /* * Add the new data block. */ if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &use_block))) { xfs_da_brelse(tp, lbp); return error; } /* * Initialize the block. */ if ((error = xfs_dir2_data_init(args, use_block, &dbp))) { xfs_da_brelse(tp, lbp); return error; } /* * If we're adding a new data block on the end we need to * extend the bests table. Copy it up one entry. */ if (use_block >= be32_to_cpu(ltp->bestcount)) { bestsp--; memmove(&bestsp[0], &bestsp[1], be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0])); be32_add_cpu(<p->bestcount, 1); xfs_dir2_leaf_log_tail(tp, lbp); xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); } /* * If we're filling in a previously empty block just log it. */ else xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block); hdr = dbp->data; bestsp[use_block] = hdr->bestfree[0].length; grown = 1; } /* * Already had space in some data block. * Just read that one in. */ else { if ((error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, use_block), -1, &dbp, XFS_DATA_FORK))) { xfs_da_brelse(tp, lbp); return error; } hdr = dbp->data; grown = 0; } xfs_dir2_data_check(dp, dbp); /* * Point to the biggest freespace in our data block. */ dup = (xfs_dir2_data_unused_t *) ((char *)hdr + be16_to_cpu(hdr->bestfree[0].offset)); ASSERT(be16_to_cpu(dup->length) >= length); needscan = needlog = 0; /* * Mark the initial part of our freespace in use for the new entry. */ xfs_dir2_data_use_free(tp, dbp, dup, (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length, &needlog, &needscan); /* * Initialize our new entry (at last). */ dep = (xfs_dir2_data_entry_t *)dup; dep->inumber = cpu_to_be64(args->inumber); dep->namelen = args->namelen; memcpy(dep->name, args->name, dep->namelen); tagp = xfs_dir2_data_entry_tag_p(dep); *tagp = cpu_to_be16((char *)dep - (char *)hdr); /* * Need to scan fix up the bestfree table. */ if (needscan) xfs_dir2_data_freescan(mp, hdr, &needlog); /* * Need to log the data block's header. */ if (needlog) xfs_dir2_data_log_header(tp, dbp); xfs_dir2_data_log_entry(tp, dbp, dep); /* * If the bests table needs to be changed, do it. * Log the change unless we've already done that. */ if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(hdr->bestfree[0].length)) { bestsp[use_block] = hdr->bestfree[0].length; if (!grown) xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block); } lep = xfs_dir2_leaf_find_entry(leaf, index, compact, lowstale, highstale, &lfloglow, &lfloghigh); /* * Fill in the new leaf entry. */ lep->hashval = cpu_to_be32(args->hashval); lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, use_block, be16_to_cpu(*tagp))); /* * Log the leaf fields and give up the buffers. */ xfs_dir2_leaf_log_header(tp, lbp); xfs_dir2_leaf_log_ents(tp, lbp, lfloglow, lfloghigh); xfs_dir2_leaf_check(dp, lbp); xfs_da_buf_done(lbp); xfs_dir2_data_check(dp, dbp); xfs_da_buf_done(dbp); return 0; } #ifdef DEBUG /* * Check the internal consistency of a leaf1 block. * Pop an assert if something is wrong. */ STATIC void xfs_dir2_leaf_check( xfs_inode_t *dp, /* incore directory inode */ xfs_dabuf_t *bp) /* leaf's buffer */ { int i; /* leaf index */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */ xfs_mount_t *mp; /* filesystem mount point */ int stale; /* count of stale leaves */ leaf = bp->data; mp = dp->i_mount; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC)); /* * This value is not restrictive enough. * Should factor in the size of the bests table as well. * We can deduce a value for that from di_size. */ ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp)); ltp = xfs_dir2_leaf_tail_p(mp, leaf); /* * Leaves and bests don't overlap. */ ASSERT((char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <= (char *)xfs_dir2_leaf_bests_p(ltp)); /* * Check hash value order, count stale entries. */ for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) { if (i + 1 < be16_to_cpu(leaf->hdr.count)) ASSERT(be32_to_cpu(leaf->ents[i].hashval) <= be32_to_cpu(leaf->ents[i + 1].hashval)); if (leaf->ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) stale++; } ASSERT(be16_to_cpu(leaf->hdr.stale) == stale); } #endif /* DEBUG */ /* * Compact out any stale entries in the leaf. * Log the header and changed leaf entries, if any. */ void xfs_dir2_leaf_compact( xfs_da_args_t *args, /* operation arguments */ xfs_dabuf_t *bp) /* leaf buffer */ { int from; /* source leaf index */ xfs_dir2_leaf_t *leaf; /* leaf structure */ int loglow; /* first leaf entry to log */ int to; /* target leaf index */ leaf = bp->data; if (!leaf->hdr.stale) { return; } /* * Compress out the stale entries in place. */ for (from = to = 0, loglow = -1; from < be16_to_cpu(leaf->hdr.count); from++) { if (leaf->ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) continue; /* * Only actually copy the entries that are different. */ if (from > to) { if (loglow == -1) loglow = to; leaf->ents[to] = leaf->ents[from]; } to++; } /* * Update and log the header, log the leaf entries. */ ASSERT(be16_to_cpu(leaf->hdr.stale) == from - to); be16_add_cpu(&leaf->hdr.count, -(be16_to_cpu(leaf->hdr.stale))); leaf->hdr.stale = 0; xfs_dir2_leaf_log_header(args->trans, bp); if (loglow != -1) xfs_dir2_leaf_log_ents(args->trans, bp, loglow, to - 1); } /* * Compact the leaf entries, removing stale ones. * Leave one stale entry behind - the one closest to our * insertion index - and the caller will shift that one to our insertion * point later. * Return new insertion index, where the remaining stale entry is, * and leaf logging indices. */ void xfs_dir2_leaf_compact_x1( xfs_dabuf_t *bp, /* leaf buffer */ int *indexp, /* insertion index */ int *lowstalep, /* out: stale entry before us */ int *highstalep, /* out: stale entry after us */ int *lowlogp, /* out: low log index */ int *highlogp) /* out: high log index */ { int from; /* source copy index */ int highstale; /* stale entry at/after index */ int index; /* insertion index */ int keepstale; /* source index of kept stale */ xfs_dir2_leaf_t *leaf; /* leaf structure */ int lowstale; /* stale entry before index */ int newindex=0; /* new insertion index */ int to; /* destination copy index */ leaf = bp->data; ASSERT(be16_to_cpu(leaf->hdr.stale) > 1); index = *indexp; /* * Find the first stale entry before our index, if any. */ for (lowstale = index - 1; lowstale >= 0 && leaf->ents[lowstale].address != cpu_to_be32(XFS_DIR2_NULL_DATAPTR); lowstale--) continue; /* * Find the first stale entry at or after our index, if any. * Stop if the answer would be worse than lowstale. */ for (highstale = index; highstale < be16_to_cpu(leaf->hdr.count) && leaf->ents[highstale].address != cpu_to_be32(XFS_DIR2_NULL_DATAPTR) && (lowstale < 0 || index - lowstale > highstale - index); highstale++) continue; /* * Pick the better of lowstale and highstale. */ if (lowstale >= 0 && (highstale == be16_to_cpu(leaf->hdr.count) || index - lowstale <= highstale - index)) keepstale = lowstale; else keepstale = highstale; /* * Copy the entries in place, removing all the stale entries * except keepstale. */ for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) { /* * Notice the new value of index. */ if (index == from) newindex = to; if (from != keepstale && leaf->ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) { if (from == to) *lowlogp = to; continue; } /* * Record the new keepstale value for the insertion. */ if (from == keepstale) lowstale = highstale = to; /* * Copy only the entries that have moved. */ if (from > to) leaf->ents[to] = leaf->ents[from]; to++; } ASSERT(from > to); /* * If the insertion point was past the last entry, * set the new insertion point accordingly. */ if (index == from) newindex = to; *indexp = newindex; /* * Adjust the leaf header values. */ be16_add_cpu(&leaf->hdr.count, -(from - to)); leaf->hdr.stale = cpu_to_be16(1); /* * Remember the low/high stale value only in the "right" * direction. */ if (lowstale >= newindex) lowstale = -1; else highstale = be16_to_cpu(leaf->hdr.count); *highlogp = be16_to_cpu(leaf->hdr.count) - 1; *lowstalep = lowstale; *highstalep = highstale; } /* * Getdents (readdir) for leaf and node directories. * This reads the data blocks only, so is the same for both forms. */ int /* error */ xfs_dir2_leaf_getdents( xfs_inode_t *dp, /* incore directory inode */ void *dirent, size_t bufsize, xfs_off_t *offset, filldir_t filldir) { xfs_dabuf_t *bp; /* data block buffer */ int byteoff; /* offset in current block */ xfs_dir2_db_t curdb; /* db for current block */ xfs_dir2_off_t curoff; /* current overall offset */ xfs_dir2_data_hdr_t *hdr; /* data block header */ xfs_dir2_data_entry_t *dep; /* data entry */ xfs_dir2_data_unused_t *dup; /* unused entry */ int error = 0; /* error return value */ int i; /* temporary loop index */ int j; /* temporary loop index */ int length; /* temporary length value */ xfs_bmbt_irec_t *map; /* map vector for blocks */ xfs_extlen_t map_blocks; /* number of fsbs in map */ xfs_dablk_t map_off; /* last mapped file offset */ int map_size; /* total entries in *map */ int map_valid; /* valid entries in *map */ xfs_mount_t *mp; /* filesystem mount point */ xfs_dir2_off_t newoff; /* new curoff after new blk */ int nmap; /* mappings to ask xfs_bmapi */ char *ptr = NULL; /* pointer to current data */ int ra_current; /* number of read-ahead blks */ int ra_index; /* *map index for read-ahead */ int ra_offset; /* map entry offset for ra */ int ra_want; /* readahead count wanted */ /* * If the offset is at or past the largest allowed value, * give up right away. */ if (*offset >= XFS_DIR2_MAX_DATAPTR) return 0; mp = dp->i_mount; /* * Set up to bmap a number of blocks based on the caller's * buffer size, the directory block size, and the filesystem * block size. */ map_size = howmany(bufsize + mp->m_dirblksize, mp->m_sb.sb_blocksize); map = kmem_alloc(map_size * sizeof(*map), KM_SLEEP); map_valid = ra_index = ra_offset = ra_current = map_blocks = 0; bp = NULL; /* * Inside the loop we keep the main offset value as a byte offset * in the directory file. */ curoff = xfs_dir2_dataptr_to_byte(mp, *offset); /* * Force this conversion through db so we truncate the offset * down to get the start of the data block. */ map_off = xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, curoff)); /* * Loop over directory entries until we reach the end offset. * Get more blocks and readahead as necessary. */ while (curoff < XFS_DIR2_LEAF_OFFSET) { /* * If we have no buffer, or we're off the end of the * current buffer, need to get another one. */ if (!bp || ptr >= (char *)bp->data + mp->m_dirblksize) { /* * If we have a buffer, we need to release it and * take it out of the mapping. */ if (bp) { xfs_da_brelse(NULL, bp); bp = NULL; map_blocks -= mp->m_dirblkfsbs; /* * Loop to get rid of the extents for the * directory block. */ for (i = mp->m_dirblkfsbs; i > 0; ) { j = MIN((int)map->br_blockcount, i); map->br_blockcount -= j; map->br_startblock += j; map->br_startoff += j; /* * If mapping is done, pitch it from * the table. */ if (!map->br_blockcount && --map_valid) memmove(&map[0], &map[1], sizeof(map[0]) * map_valid); i -= j; } } /* * Recalculate the readahead blocks wanted. */ ra_want = howmany(bufsize + mp->m_dirblksize, mp->m_sb.sb_blocksize) - 1; ASSERT(ra_want >= 0); /* * If we don't have as many as we want, and we haven't * run out of data blocks, get some more mappings. */ if (1 + ra_want > map_blocks && map_off < xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET)) { /* * Get more bmaps, fill in after the ones * we already have in the table. */ nmap = map_size - map_valid; error = xfs_bmapi(NULL, dp, map_off, xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET) - map_off, XFS_BMAPI_METADATA, NULL, 0, &map[map_valid], &nmap, NULL); /* * Don't know if we should ignore this or * try to return an error. * The trouble with returning errors * is that readdir will just stop without * actually passing the error through. */ if (error) break; /* XXX */ /* * If we got all the mappings we asked for, * set the final map offset based on the * last bmap value received. * Otherwise, we've reached the end. */ if (nmap == map_size - map_valid) map_off = map[map_valid + nmap - 1].br_startoff + map[map_valid + nmap - 1].br_blockcount; else map_off = xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET); /* * Look for holes in the mapping, and * eliminate them. Count up the valid blocks. */ for (i = map_valid; i < map_valid + nmap; ) { if (map[i].br_startblock == HOLESTARTBLOCK) { nmap--; length = map_valid + nmap - i; if (length) memmove(&map[i], &map[i + 1], sizeof(map[i]) * length); } else { map_blocks += map[i].br_blockcount; i++; } } map_valid += nmap; } /* * No valid mappings, so no more data blocks. */ if (!map_valid) { curoff = xfs_dir2_da_to_byte(mp, map_off); break; } /* * Read the directory block starting at the first * mapping. */ curdb = xfs_dir2_da_to_db(mp, map->br_startoff); error = xfs_da_read_buf(NULL, dp, map->br_startoff, map->br_blockcount >= mp->m_dirblkfsbs ? XFS_FSB_TO_DADDR(mp, map->br_startblock) : -1, &bp, XFS_DATA_FORK); /* * Should just skip over the data block instead * of giving up. */ if (error) break; /* XXX */ /* * Adjust the current amount of read-ahead: we just * read a block that was previously ra. */ if (ra_current) ra_current -= mp->m_dirblkfsbs; /* * Do we need more readahead? */ for (ra_index = ra_offset = i = 0; ra_want > ra_current && i < map_blocks; i += mp->m_dirblkfsbs) { ASSERT(ra_index < map_valid); /* * Read-ahead a contiguous directory block. */ if (i > ra_current && map[ra_index].br_blockcount >= mp->m_dirblkfsbs) { xfs_buf_readahead(mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, map[ra_index].br_startblock + ra_offset), (int)BTOBB(mp->m_dirblksize)); ra_current = i; } /* * Read-ahead a non-contiguous directory block. * This doesn't use our mapping, but this * is a very rare case. */ else if (i > ra_current) { (void)xfs_da_reada_buf(NULL, dp, map[ra_index].br_startoff + ra_offset, XFS_DATA_FORK); ra_current = i; } /* * Advance offset through the mapping table. */ for (j = 0; j < mp->m_dirblkfsbs; j++) { /* * The rest of this extent but not * more than a dir block. */ length = MIN(mp->m_dirblkfsbs, (int)(map[ra_index].br_blockcount - ra_offset)); j += length; ra_offset += length; /* * Advance to the next mapping if * this one is used up. */ if (ra_offset == map[ra_index].br_blockcount) { ra_offset = 0; ra_index++; } } } /* * Having done a read, we need to set a new offset. */ newoff = xfs_dir2_db_off_to_byte(mp, curdb, 0); /* * Start of the current block. */ if (curoff < newoff) curoff = newoff; /* * Make sure we're in the right block. */ else if (curoff > newoff) ASSERT(xfs_dir2_byte_to_db(mp, curoff) == curdb); hdr = bp->data; xfs_dir2_data_check(dp, bp); /* * Find our position in the block. */ ptr = (char *)(hdr + 1); byteoff = xfs_dir2_byte_to_off(mp, curoff); /* * Skip past the header. */ if (byteoff == 0) curoff += (uint)sizeof(*hdr); /* * Skip past entries until we reach our offset. */ else { while ((char *)ptr - (char *)hdr < byteoff) { dup = (xfs_dir2_data_unused_t *)ptr; if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { length = be16_to_cpu(dup->length); ptr += length; continue; } dep = (xfs_dir2_data_entry_t *)ptr; length = xfs_dir2_data_entsize(dep->namelen); ptr += length; } /* * Now set our real offset. */ curoff = xfs_dir2_db_off_to_byte(mp, xfs_dir2_byte_to_db(mp, curoff), (char *)ptr - (char *)hdr); if (ptr >= (char *)hdr + mp->m_dirblksize) { continue; } } } /* * We have a pointer to an entry. * Is it a live one? */ dup = (xfs_dir2_data_unused_t *)ptr; /* * No, it's unused, skip over it. */ if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { length = be16_to_cpu(dup->length); ptr += length; curoff += length; continue; } dep = (xfs_dir2_data_entry_t *)ptr; length = xfs_dir2_data_entsize(dep->namelen); if (filldir(dirent, (char *)dep->name, dep->namelen, xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff, be64_to_cpu(dep->inumber), DT_UNKNOWN)) break; /* * Advance to next entry in the block. */ ptr += length; curoff += length; /* bufsize may have just been a guess; don't go negative */ bufsize = bufsize > length ? bufsize - length : 0; } /* * All done. Set output offset value to current offset. */ if (curoff > xfs_dir2_dataptr_to_byte(mp, XFS_DIR2_MAX_DATAPTR)) *offset = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; else *offset = xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff; kmem_free(map); if (bp) xfs_da_brelse(NULL, bp); return error; } /* * Initialize a new leaf block, leaf1 or leafn magic accepted. */ int xfs_dir2_leaf_init( xfs_da_args_t *args, /* operation arguments */ xfs_dir2_db_t bno, /* directory block number */ xfs_dabuf_t **bpp, /* out: leaf buffer */ int magic) /* magic number for block */ { xfs_dabuf_t *bp; /* leaf buffer */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ xfs_mount_t *mp; /* filesystem mount point */ xfs_trans_t *tp; /* transaction pointer */ dp = args->dp; ASSERT(dp != NULL); tp = args->trans; mp = dp->i_mount; ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) && bno < XFS_DIR2_FREE_FIRSTDB(mp)); /* * Get the buffer for the block. */ error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp, XFS_DATA_FORK); if (error) { return error; } ASSERT(bp != NULL); leaf = bp->data; /* * Initialize the header. */ leaf->hdr.info.magic = cpu_to_be16(magic); leaf->hdr.info.forw = 0; leaf->hdr.info.back = 0; leaf->hdr.count = 0; leaf->hdr.stale = 0; xfs_dir2_leaf_log_header(tp, bp); /* * If it's a leaf-format directory initialize the tail. * In this case our caller has the real bests table to copy into * the block. */ if (magic == XFS_DIR2_LEAF1_MAGIC) { ltp = xfs_dir2_leaf_tail_p(mp, leaf); ltp->bestcount = 0; xfs_dir2_leaf_log_tail(tp, bp); } *bpp = bp; return 0; } /* * Log the bests entries indicated from a leaf1 block. */ static void xfs_dir2_leaf_log_bests( xfs_trans_t *tp, /* transaction pointer */ xfs_dabuf_t *bp, /* leaf buffer */ int first, /* first entry to log */ int last) /* last entry to log */ { __be16 *firstb; /* pointer to first entry */ __be16 *lastb; /* pointer to last entry */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ leaf = bp->data; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC)); ltp = xfs_dir2_leaf_tail_p(tp->t_mountp, leaf); firstb = xfs_dir2_leaf_bests_p(ltp) + first; lastb = xfs_dir2_leaf_bests_p(ltp) + last; xfs_da_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf), (uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1)); } /* * Log the leaf entries indicated from a leaf1 or leafn block. */ void xfs_dir2_leaf_log_ents( xfs_trans_t *tp, /* transaction pointer */ xfs_dabuf_t *bp, /* leaf buffer */ int first, /* first entry to log */ int last) /* last entry to log */ { xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */ xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */ xfs_dir2_leaf_t *leaf; /* leaf structure */ leaf = bp->data; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); firstlep = &leaf->ents[first]; lastlep = &leaf->ents[last]; xfs_da_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf), (uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1)); } /* * Log the header of the leaf1 or leafn block. */ void xfs_dir2_leaf_log_header( xfs_trans_t *tp, /* transaction pointer */ xfs_dabuf_t *bp) /* leaf buffer */ { xfs_dir2_leaf_t *leaf; /* leaf structure */ leaf = bp->data; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); xfs_da_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf), (uint)(sizeof(leaf->hdr) - 1)); } /* * Log the tail of the leaf1 block. */ STATIC void xfs_dir2_leaf_log_tail( xfs_trans_t *tp, /* transaction pointer */ xfs_dabuf_t *bp) /* leaf buffer */ { xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ xfs_mount_t *mp; /* filesystem mount point */ mp = tp->t_mountp; leaf = bp->data; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC)); ltp = xfs_dir2_leaf_tail_p(mp, leaf); xfs_da_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf), (uint)(mp->m_dirblksize - 1)); } /* * Look up the entry referred to by args in the leaf format directory. * Most of the work is done by the xfs_dir2_leaf_lookup_int routine which * is also used by the node-format code. */ int xfs_dir2_leaf_lookup( xfs_da_args_t *args) /* operation arguments */ { xfs_dabuf_t *dbp; /* data block buffer */ xfs_dir2_data_entry_t *dep; /* data block entry */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ int index; /* found entry index */ xfs_dabuf_t *lbp; /* leaf buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_trans_t *tp; /* transaction pointer */ trace_xfs_dir2_leaf_lookup(args); /* * Look up name in the leaf block, returning both buffers and index. */ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { return error; } tp = args->trans; dp = args->dp; xfs_dir2_leaf_check(dp, lbp); leaf = lbp->data; /* * Get to the leaf entry and contained data entry address. */ lep = &leaf->ents[index]; /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *) ((char *)dbp->data + xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address))); /* * Return the found inode number & CI name if appropriate */ args->inumber = be64_to_cpu(dep->inumber); error = xfs_dir_cilookup_result(args, dep->name, dep->namelen); xfs_da_brelse(tp, dbp); xfs_da_brelse(tp, lbp); return XFS_ERROR(error); } /* * Look up name/hash in the leaf block. * Fill in indexp with the found index, and dbpp with the data buffer. * If not found dbpp will be NULL, and ENOENT comes back. * lbpp will always be filled in with the leaf buffer unless there's an error. */ static int /* error */ xfs_dir2_leaf_lookup_int( xfs_da_args_t *args, /* operation arguments */ xfs_dabuf_t **lbpp, /* out: leaf buffer */ int *indexp, /* out: index in leaf block */ xfs_dabuf_t **dbpp) /* out: data buffer */ { xfs_dir2_db_t curdb = -1; /* current data block number */ xfs_dabuf_t *dbp = NULL; /* data buffer */ xfs_dir2_data_entry_t *dep; /* data entry */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ int index; /* index in leaf block */ xfs_dabuf_t *lbp; /* leaf buffer */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_mount_t *mp; /* filesystem mount point */ xfs_dir2_db_t newdb; /* new data block number */ xfs_trans_t *tp; /* transaction pointer */ xfs_dir2_db_t cidb = -1; /* case match data block no. */ enum xfs_dacmp cmp; /* name compare result */ dp = args->dp; tp = args->trans; mp = dp->i_mount; /* * Read the leaf block into the buffer. */ error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp, XFS_DATA_FORK); if (error) return error; *lbpp = lbp; leaf = lbp->data; xfs_dir2_leaf_check(dp, lbp); /* * Look for the first leaf entry with our hash value. */ index = xfs_dir2_leaf_search_hash(args, lbp); /* * Loop over all the entries with the right hash value * looking to match the name. */ for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval; lep++, index++) { /* * Skip over stale leaf entries. */ if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) continue; /* * Get the new data block number. */ newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); /* * If it's not the same as the old data block number, * need to pitch the old one and read the new one. */ if (newdb != curdb) { if (dbp) xfs_da_brelse(tp, dbp); error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, newdb), -1, &dbp, XFS_DATA_FORK); if (error) { xfs_da_brelse(tp, lbp); return error; } xfs_dir2_data_check(dp, dbp); curdb = newdb; } /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *)((char *)dbp->data + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address))); /* * Compare name and if it's an exact match, return the index * and buffer. If it's the first case-insensitive match, store * the index and buffer and continue looking for an exact match. */ cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen); if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) { args->cmpresult = cmp; *indexp = index; /* case exact match: return the current buffer. */ if (cmp == XFS_CMP_EXACT) { *dbpp = dbp; return 0; } cidb = curdb; } } ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); /* * Here, we can only be doing a lookup (not a rename or remove). * If a case-insensitive match was found earlier, re-read the * appropriate data block if required and return it. */ if (args->cmpresult == XFS_CMP_CASE) { ASSERT(cidb != -1); if (cidb != curdb) { xfs_da_brelse(tp, dbp); error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, cidb), -1, &dbp, XFS_DATA_FORK); if (error) { xfs_da_brelse(tp, lbp); return error; } } *dbpp = dbp; return 0; } /* * No match found, return ENOENT. */ ASSERT(cidb == -1); if (dbp) xfs_da_brelse(tp, dbp); xfs_da_brelse(tp, lbp); return XFS_ERROR(ENOENT); } /* * Remove an entry from a leaf format directory. */ int /* error */ xfs_dir2_leaf_removename( xfs_da_args_t *args) /* operation arguments */ { __be16 *bestsp; /* leaf block best freespace */ xfs_dir2_data_hdr_t *hdr; /* data block header */ xfs_dir2_db_t db; /* data block number */ xfs_dabuf_t *dbp; /* data block buffer */ xfs_dir2_data_entry_t *dep; /* data entry structure */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ xfs_dir2_db_t i; /* temporary data block # */ int index; /* index into leaf entries */ xfs_dabuf_t *lbp; /* leaf buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ 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 oldbest; /* old value of best free */ xfs_trans_t *tp; /* transaction pointer */ trace_xfs_dir2_leaf_removename(args); /* * Lookup the leaf entry, get the leaf and data blocks read in. */ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { return error; } dp = args->dp; tp = args->trans; mp = dp->i_mount; leaf = lbp->data; hdr = dbp->data; xfs_dir2_data_check(dp, dbp); /* * Point to the leaf entry, use that to point to the data entry. */ lep = &leaf->ents[index]; db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); dep = (xfs_dir2_data_entry_t *) ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address))); needscan = needlog = 0; oldbest = be16_to_cpu(hdr->bestfree[0].length); ltp = xfs_dir2_leaf_tail_p(mp, leaf); bestsp = xfs_dir2_leaf_bests_p(ltp); ASSERT(be16_to_cpu(bestsp[db]) == oldbest); /* * Mark the former data entry unused. */ xfs_dir2_data_make_free(tp, dbp, (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr), xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan); /* * We just mark the leaf entry stale by putting a null in it. */ be16_add_cpu(&leaf->hdr.stale, 1); xfs_dir2_leaf_log_header(tp, lbp); lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); xfs_dir2_leaf_log_ents(tp, lbp, index, index); /* * Scan the freespace in the data block again if necessary, * log the data block header if necessary. */ if (needscan) xfs_dir2_data_freescan(mp, hdr, &needlog); if (needlog) xfs_dir2_data_log_header(tp, dbp); /* * If the longest freespace in the data block has changed, * put the new value in the bests table and log that. */ if (be16_to_cpu(hdr->bestfree[0].length) != oldbest) { bestsp[db] = hdr->bestfree[0].length; xfs_dir2_leaf_log_bests(tp, lbp, db, db); } xfs_dir2_data_check(dp, dbp); /* * If the data block is now empty then get rid of the data block. */ if (be16_to_cpu(hdr->bestfree[0].length) == mp->m_dirblksize - (uint)sizeof(*hdr)) { ASSERT(db != mp->m_dirdatablk); if ((error = xfs_dir2_shrink_inode(args, db, dbp))) { /* * Nope, can't get rid of it because it caused * allocation of a bmap btree block to do so. * Just go on, returning success, leaving the * empty block in place. */ if (error == ENOSPC && args->total == 0) { xfs_da_buf_done(dbp); error = 0; } xfs_dir2_leaf_check(dp, lbp); xfs_da_buf_done(lbp); return error; } dbp = NULL; /* * If this is the last data block then compact the * bests table by getting rid of entries. */ if (db == be32_to_cpu(ltp->bestcount) - 1) { /* * Look for the last active entry (i). */ for (i = db - 1; i > 0; i--) { if (bestsp[i] != cpu_to_be16(NULLDATAOFF)) break; } /* * Copy the table down so inactive entries at the * end are removed. */ memmove(&bestsp[db - i], bestsp, (be32_to_cpu(ltp->bestcount) - (db - i)) * sizeof(*bestsp)); be32_add_cpu(<p->bestcount, -(db - i)); xfs_dir2_leaf_log_tail(tp, lbp); xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); } else bestsp[db] = cpu_to_be16(NULLDATAOFF); } /* * If the data block was not the first one, drop it. */ else if (db != mp->m_dirdatablk && dbp != NULL) { xfs_da_buf_done(dbp); dbp = NULL; } xfs_dir2_leaf_check(dp, lbp); /* * See if we can convert to block form. */ return xfs_dir2_leaf_to_block(args, lbp, dbp); } /* * Replace the inode number in a leaf format directory entry. */ int /* error */ xfs_dir2_leaf_replace( xfs_da_args_t *args) /* operation arguments */ { xfs_dabuf_t *dbp; /* data block buffer */ xfs_dir2_data_entry_t *dep; /* data block entry */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ int index; /* index of leaf entry */ xfs_dabuf_t *lbp; /* leaf buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_trans_t *tp; /* transaction pointer */ trace_xfs_dir2_leaf_replace(args); /* * Look up the entry. */ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) { return error; } dp = args->dp; leaf = lbp->data; /* * Point to the leaf entry, get data address from it. */ lep = &leaf->ents[index]; /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *) ((char *)dbp->data + xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address))); ASSERT(args->inumber != be64_to_cpu(dep->inumber)); /* * Put the new inode number in, log it. */ dep->inumber = cpu_to_be64(args->inumber); tp = args->trans; xfs_dir2_data_log_entry(tp, dbp, dep); xfs_da_buf_done(dbp); xfs_dir2_leaf_check(dp, lbp); xfs_da_brelse(tp, lbp); return 0; } /* * Return index in the leaf block (lbp) which is either the first * one with this hash value, or if there are none, the insert point * for that hash value. */ int /* index value */ xfs_dir2_leaf_search_hash( xfs_da_args_t *args, /* operation arguments */ xfs_dabuf_t *lbp) /* leaf buffer */ { xfs_dahash_t hash=0; /* hash from this entry */ xfs_dahash_t hashwant; /* hash value looking for */ int high; /* high leaf index */ int low; /* low leaf index */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ int mid=0; /* current leaf index */ leaf = lbp->data; #ifndef __KERNEL__ if (!leaf->hdr.count) return 0; #endif /* * Note, the table cannot be empty, so we have to go through the loop. * Binary search the leaf entries looking for our hash value. */ for (lep = leaf->ents, low = 0, high = be16_to_cpu(leaf->hdr.count) - 1, hashwant = args->hashval; low <= high; ) { mid = (low + high) >> 1; if ((hash = be32_to_cpu(lep[mid].hashval)) == hashwant) break; if (hash < hashwant) low = mid + 1; else high = mid - 1; } /* * Found one, back up through all the equal hash values. */ if (hash == hashwant) { while (mid > 0 && be32_to_cpu(lep[mid - 1].hashval) == hashwant) { mid--; } } /* * Need to point to an entry higher than ours. */ else if (hash < hashwant) mid++; return mid; } /* * Trim off a trailing data block. We know it's empty since the leaf * freespace table says so. */ int /* error */ xfs_dir2_leaf_trim_data( xfs_da_args_t *args, /* operation arguments */ xfs_dabuf_t *lbp, /* leaf buffer */ xfs_dir2_db_t db) /* data block number */ { __be16 *bestsp; /* leaf bests table */ xfs_dabuf_t *dbp; /* data block buffer */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return value */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_tail_t *ltp; /* leaf tail 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 offending data block. We need its buffer. */ if ((error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, db), -1, &dbp, XFS_DATA_FORK))) { return error; } leaf = lbp->data; ltp = xfs_dir2_leaf_tail_p(mp, leaf); #ifdef DEBUG { struct xfs_dir2_data_hdr *hdr = dbp->data; ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)); ASSERT(be16_to_cpu(hdr->bestfree[0].length) == mp->m_dirblksize - (uint)sizeof(*hdr)); ASSERT(db == be32_to_cpu(ltp->bestcount) - 1); } #endif /* * Get rid of the data block. */ if ((error = xfs_dir2_shrink_inode(args, db, dbp))) { ASSERT(error != ENOSPC); xfs_da_brelse(tp, dbp); return error; } /* * Eliminate the last bests entry from the table. */ bestsp = xfs_dir2_leaf_bests_p(ltp); be32_add_cpu(<p->bestcount, -1); memmove(&bestsp[1], &bestsp[0], be32_to_cpu(ltp->bestcount) * sizeof(*bestsp)); xfs_dir2_leaf_log_tail(tp, lbp); xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); return 0; } static inline size_t xfs_dir2_leaf_size( struct xfs_dir2_leaf_hdr *hdr, int counts) { int entries; entries = be16_to_cpu(hdr->count) - be16_to_cpu(hdr->stale); return sizeof(xfs_dir2_leaf_hdr_t) + entries * sizeof(xfs_dir2_leaf_entry_t) + counts * sizeof(xfs_dir2_data_off_t) + sizeof(xfs_dir2_leaf_tail_t); } /* * Convert node form directory to leaf form directory. * The root of the node form dir needs to already be a LEAFN block. * Just return if we can't do anything. */ int /* error */ xfs_dir2_node_to_leaf( xfs_da_state_t *state) /* directory operation state */ { xfs_da_args_t *args; /* operation arguments */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return code */ xfs_dabuf_t *fbp; /* buffer for freespace block */ xfs_fileoff_t fo; /* freespace file offset */ xfs_dir2_free_t *free; /* freespace structure */ xfs_dabuf_t *lbp; /* buffer for leaf block */ xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_mount_t *mp; /* filesystem mount point */ int rval; /* successful free trim? */ xfs_trans_t *tp; /* transaction pointer */ /* * There's more than a leaf level in the btree, so there must * be multiple leafn blocks. Give up. */ if (state->path.active > 1) return 0; args = state->args; trace_xfs_dir2_node_to_leaf(args); mp = state->mp; dp = args->dp; tp = args->trans; /* * Get the last offset in the file. */ if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) { return error; } fo -= mp->m_dirblkfsbs; /* * If there are freespace blocks other than the first one, * take this opportunity to remove trailing empty freespace blocks * that may have been left behind during no-space-reservation * operations. */ while (fo > mp->m_dirfreeblk) { if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) { return error; } if (rval) fo -= mp->m_dirblkfsbs; else return 0; } /* * Now find the block just before the freespace block. */ if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) { return error; } /* * If it's not the single leaf block, give up. */ if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize) return 0; lbp = state->path.blk[0].bp; leaf = lbp->data; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); /* * Read the freespace block. */ if ((error = xfs_da_read_buf(tp, dp, mp->m_dirfreeblk, -1, &fbp, XFS_DATA_FORK))) { return error; } free = fbp->data; ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); ASSERT(!free->hdr.firstdb); /* * Now see if the leafn and free data will fit in a leaf1. * If not, release the buffer and give up. */ if (xfs_dir2_leaf_size(&leaf->hdr, be32_to_cpu(free->hdr.nvalid)) > mp->m_dirblksize) { xfs_da_brelse(tp, fbp); return 0; } /* * If the leaf has any stale entries in it, compress them out. * The compact routine will log the header. */ if (be16_to_cpu(leaf->hdr.stale)) xfs_dir2_leaf_compact(args, lbp); else xfs_dir2_leaf_log_header(tp, lbp); leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAF1_MAGIC); /* * Set up the leaf tail from the freespace block. */ ltp = xfs_dir2_leaf_tail_p(mp, leaf); ltp->bestcount = free->hdr.nvalid; /* * Set up the leaf bests table. */ memcpy(xfs_dir2_leaf_bests_p(ltp), free->bests, be32_to_cpu(ltp->bestcount) * sizeof(xfs_dir2_data_off_t)); xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); xfs_dir2_leaf_log_tail(tp, lbp); xfs_dir2_leaf_check(dp, lbp); /* * Get rid of the freespace block. */ error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp); if (error) { /* * This can't fail here because it can only happen when * punching out the middle of an extent, and this is an * isolated block. */ ASSERT(error != ENOSPC); return error; } fbp = NULL; /* * Now see if we can convert the single-leaf directory * down to a block form directory. * This routine always kills the dabuf for the leaf, so * eliminate it from the path. */ error = xfs_dir2_leaf_to_block(args, lbp, NULL); state->path.blk[0].bp = NULL; return error; }