diff options
Diffstat (limited to 'fs/xfs/xfs_dir2_leaf.c')
| -rw-r--r-- | fs/xfs/xfs_dir2_leaf.c | 1910 |
1 files changed, 1910 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c new file mode 100644 index 00000000..66e108f5 --- /dev/null +++ b/fs/xfs/xfs_dir2_leaf.c @@ -0,0 +1,1910 @@ +/* + * 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; +} + +STATIC void +xfs_dir2_leaf_find_stale( + struct xfs_dir2_leaf *leaf, + int index, + int *lowstale, + int *highstale) +{ + /* + * Find the first stale entry before our index, if any. + */ + for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) { + if (leaf->ents[*lowstale].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) + break; + } + + /* + * Find the first stale entry at or after our index, if any. + * Stop if the result would require moving more entries than using + * lowstale. + */ + for (*highstale = index; + *highstale < be16_to_cpu(leaf->hdr.count); + ++*highstale) { + if (leaf->ents[*highstale].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) + break; + if (*lowstale >= 0 && index - *lowstale <= *highstale - index) + break; + } +} + +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) + xfs_dir2_leaf_find_stale(leaf, index, &lowstale, &highstale); + + /* + * 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; + + xfs_dir2_leaf_find_stale(leaf, index, &lowstale, &highstale); + + /* + * 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_read(dp, map_off, + xfs_dir2_byte_to_da(mp, + XFS_DIR2_LEAF_OFFSET) - map_off, + &map[map_valid], &nmap, 0); + /* + * 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; +} |