/* * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. * Copyright (c) 2013 Red Hat, 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_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_mount.h" #include "xfs_da_format.h" #include "xfs_da_btree.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_dir2.h" #include "xfs_dir2_priv.h" #include "xfs_error.h" #include "xfs_trace.h" #include "xfs_trans.h" #include "xfs_buf_item.h" #include "xfs_cksum.h" /* * Local function declarations. */ static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, struct xfs_buf **lbpp, int *indexp, struct xfs_buf **dbpp); static void xfs_dir3_leaf_log_bests(struct xfs_da_args *args, struct xfs_buf *bp, int first, int last); static void xfs_dir3_leaf_log_tail(struct xfs_da_args *args, struct xfs_buf *bp); /* * Check the internal consistency of a leaf1 block. * Pop an assert if something is wrong. */ #ifdef DEBUG #define xfs_dir3_leaf_check(dp, bp) \ do { \ if (!xfs_dir3_leaf1_check((dp), (bp))) \ ASSERT(0); \ } while (0); STATIC bool xfs_dir3_leaf1_check( struct xfs_inode *dp, struct xfs_buf *bp) { struct xfs_dir2_leaf *leaf = bp->b_addr; struct xfs_dir3_icleaf_hdr leafhdr; dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); if (leafhdr.magic == XFS_DIR3_LEAF1_MAGIC) { struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr; if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn) return false; } else if (leafhdr.magic != XFS_DIR2_LEAF1_MAGIC) return false; return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf); } #else #define xfs_dir3_leaf_check(dp, bp) #endif bool xfs_dir3_leaf_check_int( struct xfs_mount *mp, struct xfs_inode *dp, struct xfs_dir3_icleaf_hdr *hdr, struct xfs_dir2_leaf *leaf) { struct xfs_dir2_leaf_entry *ents; xfs_dir2_leaf_tail_t *ltp; int stale; int i; const struct xfs_dir_ops *ops; struct xfs_dir3_icleaf_hdr leafhdr; struct xfs_da_geometry *geo = mp->m_dir_geo; /* * we can be passed a null dp here from a verifier, so we need to go the * hard way to get them. */ ops = xfs_dir_get_ops(mp, dp); if (!hdr) { ops->leaf_hdr_from_disk(&leafhdr, leaf); hdr = &leafhdr; } ents = ops->leaf_ents_p(leaf); ltp = xfs_dir2_leaf_tail_p(geo, leaf); /* * XXX (dgc): 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. */ if (hdr->count > ops->leaf_max_ents(geo)) return false; /* Leaves and bests don't overlap in leaf format. */ if ((hdr->magic == XFS_DIR2_LEAF1_MAGIC || hdr->magic == XFS_DIR3_LEAF1_MAGIC) && (char *)&ents[hdr->count] > (char *)xfs_dir2_leaf_bests_p(ltp)) return false; /* Check hash value order, count stale entries. */ for (i = stale = 0; i < hdr->count; i++) { if (i + 1 < hdr->count) { if (be32_to_cpu(ents[i].hashval) > be32_to_cpu(ents[i + 1].hashval)) return false; } if (ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) stale++; } if (hdr->stale != stale) return false; return true; } /* * We verify the magic numbers before decoding the leaf header so that on debug * kernels we don't get assertion failures in xfs_dir3_leaf_hdr_from_disk() due * to incorrect magic numbers. */ static bool xfs_dir3_leaf_verify( struct xfs_buf *bp, __uint16_t magic) { struct xfs_mount *mp = bp->b_target->bt_mount; struct xfs_dir2_leaf *leaf = bp->b_addr; ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC); if (xfs_sb_version_hascrc(&mp->m_sb)) { struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr; __uint16_t magic3; magic3 = (magic == XFS_DIR2_LEAF1_MAGIC) ? XFS_DIR3_LEAF1_MAGIC : XFS_DIR3_LEAFN_MAGIC; if (leaf3->info.hdr.magic != cpu_to_be16(magic3)) return false; if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_uuid)) return false; if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn) return false; } else { if (leaf->hdr.info.magic != cpu_to_be16(magic)) return false; } return xfs_dir3_leaf_check_int(mp, NULL, NULL, leaf); } static void __read_verify( struct xfs_buf *bp, __uint16_t magic) { struct xfs_mount *mp = bp->b_target->bt_mount; if (xfs_sb_version_hascrc(&mp->m_sb) && !xfs_buf_verify_cksum(bp, XFS_DIR3_LEAF_CRC_OFF)) xfs_buf_ioerror(bp, -EFSBADCRC); else if (!xfs_dir3_leaf_verify(bp, magic)) xfs_buf_ioerror(bp, -EFSCORRUPTED); if (bp->b_error) xfs_verifier_error(bp); } static void __write_verify( struct xfs_buf *bp, __uint16_t magic) { struct xfs_mount *mp = bp->b_target->bt_mount; struct xfs_buf_log_item *bip = bp->b_fspriv; struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr; if (!xfs_dir3_leaf_verify(bp, magic)) { xfs_buf_ioerror(bp, -EFSCORRUPTED); xfs_verifier_error(bp); return; } if (!xfs_sb_version_hascrc(&mp->m_sb)) return; if (bip) hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn); xfs_buf_update_cksum(bp, XFS_DIR3_LEAF_CRC_OFF); } static void xfs_dir3_leaf1_read_verify( struct xfs_buf *bp) { __read_verify(bp, XFS_DIR2_LEAF1_MAGIC); } static void xfs_dir3_leaf1_write_verify( struct xfs_buf *bp) { __write_verify(bp, XFS_DIR2_LEAF1_MAGIC); } static void xfs_dir3_leafn_read_verify( struct xfs_buf *bp) { __read_verify(bp, XFS_DIR2_LEAFN_MAGIC); } static void xfs_dir3_leafn_write_verify( struct xfs_buf *bp) { __write_verify(bp, XFS_DIR2_LEAFN_MAGIC); } const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops = { .verify_read = xfs_dir3_leaf1_read_verify, .verify_write = xfs_dir3_leaf1_write_verify, }; const struct xfs_buf_ops xfs_dir3_leafn_buf_ops = { .verify_read = xfs_dir3_leafn_read_verify, .verify_write = xfs_dir3_leafn_write_verify, }; static int xfs_dir3_leaf_read( struct xfs_trans *tp, struct xfs_inode *dp, xfs_dablk_t fbno, xfs_daddr_t mappedbno, struct xfs_buf **bpp) { int err; err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp, XFS_DATA_FORK, &xfs_dir3_leaf1_buf_ops); if (!err && tp) xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAF1_BUF); return err; } int xfs_dir3_leafn_read( struct xfs_trans *tp, struct xfs_inode *dp, xfs_dablk_t fbno, xfs_daddr_t mappedbno, struct xfs_buf **bpp) { int err; err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp, XFS_DATA_FORK, &xfs_dir3_leafn_buf_ops); if (!err && tp) xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAFN_BUF); return err; } /* * Initialize a new leaf block, leaf1 or leafn magic accepted. */ static void xfs_dir3_leaf_init( struct xfs_mount *mp, struct xfs_trans *tp, struct xfs_buf *bp, xfs_ino_t owner, __uint16_t type) { struct xfs_dir2_leaf *leaf = bp->b_addr; ASSERT(type == XFS_DIR2_LEAF1_MAGIC || type == XFS_DIR2_LEAFN_MAGIC); if (xfs_sb_version_hascrc(&mp->m_sb)) { struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr; memset(leaf3, 0, sizeof(*leaf3)); leaf3->info.hdr.magic = (type == XFS_DIR2_LEAF1_MAGIC) ? cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) : cpu_to_be16(XFS_DIR3_LEAFN_MAGIC); leaf3->info.blkno = cpu_to_be64(bp->b_bn); leaf3->info.owner = cpu_to_be64(owner); uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_uuid); } else { memset(leaf, 0, sizeof(*leaf)); leaf->hdr.info.magic = cpu_to_be16(type); } /* * If it's a leaf-format directory initialize the tail. * Caller is responsible for initialising the bests table. */ if (type == XFS_DIR2_LEAF1_MAGIC) { struct xfs_dir2_leaf_tail *ltp; ltp = xfs_dir2_leaf_tail_p(mp->m_dir_geo, leaf); ltp->bestcount = 0; bp->b_ops = &xfs_dir3_leaf1_buf_ops; xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAF1_BUF); } else { bp->b_ops = &xfs_dir3_leafn_buf_ops; xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF); } } int xfs_dir3_leaf_get_buf( xfs_da_args_t *args, xfs_dir2_db_t bno, struct xfs_buf **bpp, __uint16_t magic) { struct xfs_inode *dp = args->dp; struct xfs_trans *tp = args->trans; struct xfs_mount *mp = dp->i_mount; struct xfs_buf *bp; int error; ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC); ASSERT(bno >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET) && bno < xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET)); error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, bno), -1, &bp, XFS_DATA_FORK); if (error) return error; xfs_dir3_leaf_init(mp, tp, bp, dp->i_ino, magic); xfs_dir3_leaf_log_header(args, bp); if (magic == XFS_DIR2_LEAF1_MAGIC) xfs_dir3_leaf_log_tail(args, bp); *bpp = bp; return 0; } /* * Convert a block form directory to a leaf form directory. */ int /* error */ xfs_dir2_block_to_leaf( xfs_da_args_t *args, /* operation arguments */ struct xfs_buf *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 */ struct xfs_buf *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 */ int needlog; /* need to log block header */ int needscan; /* need to rescan bestfree */ xfs_trans_t *tp; /* transaction pointer */ struct xfs_dir2_data_free *bf; struct xfs_dir2_leaf_entry *ents; struct xfs_dir3_icleaf_hdr leafhdr; trace_xfs_dir2_block_to_leaf(args); dp = args->dp; 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(args->geo, blkno); ASSERT(ldb == xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)); /* * Initialize the leaf block, get a buffer for it. */ error = xfs_dir3_leaf_get_buf(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC); if (error) return error; leaf = lbp->b_addr; hdr = dbp->b_addr; xfs_dir3_data_check(dp, dbp); btp = xfs_dir2_block_tail_p(args->geo, hdr); blp = xfs_dir2_block_leaf_p(btp); bf = dp->d_ops->data_bestfree_p(hdr); ents = dp->d_ops->leaf_ents_p(leaf); /* * Set the counts in the leaf header. */ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); leafhdr.count = be32_to_cpu(btp->count); leafhdr.stale = be32_to_cpu(btp->stale); dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr); xfs_dir3_leaf_log_header(args, lbp); /* * Could compact these but I think we always do the conversion * after squeezing out stale entries. */ memcpy(ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t)); xfs_dir3_leaf_log_ents(args, lbp, 0, leafhdr.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(args, dbp, (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr), (xfs_dir2_data_aoff_t)((char *)hdr + args->geo->blksize - (char *)blp), &needlog, &needscan); /* * Fix up the block header, make it a data block. */ dbp->b_ops = &xfs_dir3_data_buf_ops; xfs_trans_buf_set_type(tp, dbp, XFS_BLFT_DIR_DATA_BUF); if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC); else hdr->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC); if (needscan) xfs_dir2_data_freescan(dp, hdr, &needlog); /* * Set up leaf tail and bests table. */ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); ltp->bestcount = cpu_to_be32(1); bestsp = xfs_dir2_leaf_bests_p(ltp); bestsp[0] = bf[0].length; /* * Log the data header and leaf bests table. */ if (needlog) xfs_dir2_data_log_header(args, dbp); xfs_dir3_leaf_check(dp, lbp); xfs_dir3_data_check(dp, dbp); xfs_dir3_leaf_log_bests(args, lbp, 0, 0); return 0; } STATIC void xfs_dir3_leaf_find_stale( struct xfs_dir3_icleaf_hdr *leafhdr, struct xfs_dir2_leaf_entry *ents, int index, int *lowstale, int *highstale) { /* * Find the first stale entry before our index, if any. */ for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) { if (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 < leafhdr->count; ++*highstale) { if (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_dir3_leaf_find_entry( struct xfs_dir3_icleaf_hdr *leafhdr, struct xfs_dir2_leaf_entry *ents, 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 (!leafhdr->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 = &ents[index]; if (index < leafhdr->count) memmove(lep + 1, lep, (leafhdr->count - index) * sizeof(*lep)); /* * Record low and high logging indices for the leaf. */ *lfloglow = index; *lfloghigh = leafhdr->count++; 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_dir3_leaf_find_stale(leafhdr, ents, index, &lowstale, &highstale); /* * If the low one is better, use it. */ if (lowstale >= 0 && (highstale == leafhdr->count || index - lowstale - 1 < highstale - index)) { ASSERT(index - lowstale - 1 >= 0); ASSERT(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(&ents[lowstale], &ents[lowstale + 1], (index - lowstale - 1) * sizeof(xfs_dir2_leaf_entry_t)); } *lfloglow = MIN(lowstale, *lfloglow); *lfloghigh = MAX(index - 1, *lfloghigh); leafhdr->stale--; return &ents[index - 1]; } /* * The high one is better, so use that one. */ ASSERT(highstale - index >= 0); ASSERT(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(&ents[index + 1], &ents[index], (highstale - index) * sizeof(xfs_dir2_leaf_entry_t)); } *lfloglow = MIN(index, *lfloglow); *lfloghigh = MAX(highstale, *lfloghigh); leafhdr->stale--; return &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 */ struct xfs_buf *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 */ struct xfs_buf *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 */ 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 */ struct xfs_dir2_data_free *bf; /* bestfree table */ struct xfs_dir2_leaf_entry *ents; struct xfs_dir3_icleaf_hdr leafhdr; trace_xfs_dir2_leaf_addname(args); dp = args->dp; tp = args->trans; error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp); if (error) return error; /* * 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->b_addr; ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); ents = dp->d_ops->leaf_ents_p(leaf); dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); bestsp = xfs_dir2_leaf_bests_p(ltp); length = dp->d_ops->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 = &ents[index]; index < leafhdr.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(args->geo, 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 (!leafhdr.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 *)&ents[leafhdr.count] < needbytes && leafhdr.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 *)&ents[leafhdr.count] < needbytes) { /* * Just checking or no space reservation, give up. */ if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0) { xfs_trans_brelse(tp, lbp); return -ENOSPC; } /* * Convert to node form. */ error = xfs_dir2_leaf_to_node(args, 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_trans_brelse(tp, lbp); return use_block == -1 ? -ENOSPC : 0; } /* * If no allocations are allowed, return now before we've * changed anything. */ if (args->total == 0 && use_block == -1) { xfs_trans_brelse(tp, lbp); return -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_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale, &highstale, &lfloglow, &lfloghigh); } /* * There are stale entries, so we'll need log-low and log-high * impossibly bad values later. */ else if (leafhdr.stale) { lfloglow = leafhdr.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_trans_brelse(tp, lbp); return error; } /* * Initialize the block. */ if ((error = xfs_dir3_data_init(args, use_block, &dbp))) { xfs_trans_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_dir3_leaf_log_tail(args, lbp); xfs_dir3_leaf_log_bests(args, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); } /* * If we're filling in a previously empty block just log it. */ else xfs_dir3_leaf_log_bests(args, lbp, use_block, use_block); hdr = dbp->b_addr; bf = dp->d_ops->data_bestfree_p(hdr); bestsp[use_block] = bf[0].length; grown = 1; } else { /* * Already had space in some data block. * Just read that one in. */ error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(args->geo, use_block), -1, &dbp); if (error) { xfs_trans_brelse(tp, lbp); return error; } hdr = dbp->b_addr; bf = dp->d_ops->data_bestfree_p(hdr); grown = 0; } /* * Point to the biggest freespace in our data block. */ dup = (xfs_dir2_data_unused_t *) ((char *)hdr + be16_to_cpu(bf[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(args, 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); dp->d_ops->data_put_ftype(dep, args->filetype); tagp = dp->d_ops->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(dp, hdr, &needlog); /* * Need to log the data block's header. */ if (needlog) xfs_dir2_data_log_header(args, dbp); xfs_dir2_data_log_entry(args, 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(bf[0].length)) { bestsp[use_block] = bf[0].length; if (!grown) xfs_dir3_leaf_log_bests(args, lbp, use_block, use_block); } lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, 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(args->geo, use_block, be16_to_cpu(*tagp))); /* * Log the leaf fields and give up the buffers. */ dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr); xfs_dir3_leaf_log_header(args, lbp); xfs_dir3_leaf_log_ents(args, lbp, lfloglow, lfloghigh); xfs_dir3_leaf_check(dp, lbp); xfs_dir3_data_check(dp, dbp); return 0; } /* * Compact out any stale entries in the leaf. * Log the header and changed leaf entries, if any. */ void xfs_dir3_leaf_compact( xfs_da_args_t *args, /* operation arguments */ struct xfs_dir3_icleaf_hdr *leafhdr, struct xfs_buf *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 */ struct xfs_dir2_leaf_entry *ents; struct xfs_inode *dp = args->dp; leaf = bp->b_addr; if (!leafhdr->stale) return; /* * Compress out the stale entries in place. */ ents = dp->d_ops->leaf_ents_p(leaf); for (from = to = 0, loglow = -1; from < leafhdr->count; from++) { if (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; ents[to] = ents[from]; } to++; } /* * Update and log the header, log the leaf entries. */ ASSERT(leafhdr->stale == from - to); leafhdr->count -= leafhdr->stale; leafhdr->stale = 0; dp->d_ops->leaf_hdr_to_disk(leaf, leafhdr); xfs_dir3_leaf_log_header(args, bp); if (loglow != -1) xfs_dir3_leaf_log_ents(args, 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_dir3_leaf_compact_x1( struct xfs_dir3_icleaf_hdr *leafhdr, struct xfs_dir2_leaf_entry *ents, 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 */ int lowstale; /* stale entry before index */ int newindex=0; /* new insertion index */ int to; /* destination copy index */ ASSERT(leafhdr->stale > 1); index = *indexp; xfs_dir3_leaf_find_stale(leafhdr, ents, index, &lowstale, &highstale); /* * Pick the better of lowstale and highstale. */ if (lowstale >= 0 && (highstale == leafhdr->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 < leafhdr->count; from++) { /* * Notice the new value of index. */ if (index == from) newindex = to; if (from != keepstale && 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) ents[to] = 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. */ leafhdr->count -= from - to; leafhdr->stale = 1; /* * Remember the low/high stale value only in the "right" * direction. */ if (lowstale >= newindex) lowstale = -1; else highstale = leafhdr->count; *highlogp = leafhdr->count - 1; *lowstalep = lowstale; *highstalep = highstale; } /* * Log the bests entries indicated from a leaf1 block. */ static void xfs_dir3_leaf_log_bests( struct xfs_da_args *args, struct xfs_buf *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 */ struct xfs_dir2_leaf *leaf = bp->b_addr; xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC)); ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); firstb = xfs_dir2_leaf_bests_p(ltp) + first; lastb = xfs_dir2_leaf_bests_p(ltp) + last; xfs_trans_log_buf(args->trans, 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_dir3_leaf_log_ents( struct xfs_da_args *args, struct xfs_buf *bp, int first, int last) { xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */ xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */ struct xfs_dir2_leaf *leaf = bp->b_addr; struct xfs_dir2_leaf_entry *ents; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)); ents = args->dp->d_ops->leaf_ents_p(leaf); firstlep = &ents[first]; lastlep = &ents[last]; xfs_trans_log_buf(args->trans, 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_dir3_leaf_log_header( struct xfs_da_args *args, struct xfs_buf *bp) { struct xfs_dir2_leaf *leaf = bp->b_addr; ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)); xfs_trans_log_buf(args->trans, bp, (uint)((char *)&leaf->hdr - (char *)leaf), args->dp->d_ops->leaf_hdr_size - 1); } /* * Log the tail of the leaf1 block. */ STATIC void xfs_dir3_leaf_log_tail( struct xfs_da_args *args, struct xfs_buf *bp) { struct xfs_dir2_leaf *leaf = bp->b_addr; xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) || leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)); ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); xfs_trans_log_buf(args->trans, bp, (uint)((char *)ltp - (char *)leaf), (uint)(args->geo->blksize - 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 */ { struct xfs_buf *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 */ struct xfs_buf *lbp; /* leaf buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_trans_t *tp; /* transaction pointer */ struct xfs_dir2_leaf_entry *ents; 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_dir3_leaf_check(dp, lbp); leaf = lbp->b_addr; ents = dp->d_ops->leaf_ents_p(leaf); /* * Get to the leaf entry and contained data entry address. */ lep = &ents[index]; /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *) ((char *)dbp->b_addr + xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address))); /* * Return the found inode number & CI name if appropriate */ args->inumber = be64_to_cpu(dep->inumber); args->filetype = dp->d_ops->data_get_ftype(dep); error = xfs_dir_cilookup_result(args, dep->name, dep->namelen); xfs_trans_brelse(tp, dbp); xfs_trans_brelse(tp, lbp); return 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 */ struct xfs_buf **lbpp, /* out: leaf buffer */ int *indexp, /* out: index in leaf block */ struct xfs_buf **dbpp) /* out: data buffer */ { xfs_dir2_db_t curdb = -1; /* current data block number */ struct xfs_buf *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 */ struct xfs_buf *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 */ struct xfs_dir2_leaf_entry *ents; struct xfs_dir3_icleaf_hdr leafhdr; dp = args->dp; tp = args->trans; mp = dp->i_mount; error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp); if (error) return error; *lbpp = lbp; leaf = lbp->b_addr; xfs_dir3_leaf_check(dp, lbp); ents = dp->d_ops->leaf_ents_p(leaf); dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); /* * 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 = &ents[index]; index < leafhdr.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(args->geo, 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_trans_brelse(tp, dbp); error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(args->geo, newdb), -1, &dbp); if (error) { xfs_trans_brelse(tp, lbp); return error; } curdb = newdb; } /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *)((char *)dbp->b_addr + xfs_dir2_dataptr_to_off(args->geo, 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_trans_brelse(tp, dbp); error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(args->geo, cidb), -1, &dbp); if (error) { xfs_trans_brelse(tp, lbp); return error; } } *dbpp = dbp; return 0; } /* * No match found, return -ENOENT. */ ASSERT(cidb == -1); if (dbp) xfs_trans_brelse(tp, dbp); xfs_trans_brelse(tp, lbp); return -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 */ struct xfs_buf *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 */ struct xfs_buf *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 */ 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 */ struct xfs_dir2_data_free *bf; /* bestfree table */ struct xfs_dir2_leaf_entry *ents; struct xfs_dir3_icleaf_hdr leafhdr; 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; leaf = lbp->b_addr; hdr = dbp->b_addr; xfs_dir3_data_check(dp, dbp); bf = dp->d_ops->data_bestfree_p(hdr); dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); ents = dp->d_ops->leaf_ents_p(leaf); /* * Point to the leaf entry, use that to point to the data entry. */ lep = &ents[index]; db = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address)); dep = (xfs_dir2_data_entry_t *)((char *)hdr + xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address))); needscan = needlog = 0; oldbest = be16_to_cpu(bf[0].length); ltp = xfs_dir2_leaf_tail_p(args->geo, 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(args, dbp, (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr), dp->d_ops->data_entsize(dep->namelen), &needlog, &needscan); /* * We just mark the leaf entry stale by putting a null in it. */ leafhdr.stale++; dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr); xfs_dir3_leaf_log_header(args, lbp); lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); xfs_dir3_leaf_log_ents(args, 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(dp, hdr, &needlog); if (needlog) xfs_dir2_data_log_header(args, 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(bf[0].length) != oldbest) { bestsp[db] = bf[0].length; xfs_dir3_leaf_log_bests(args, lbp, db, db); } xfs_dir3_data_check(dp, dbp); /* * If the data block is now empty then get rid of the data block. */ if (be16_to_cpu(bf[0].length) == args->geo->blksize - dp->d_ops->data_entry_offset) { ASSERT(db != args->geo->datablk); 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) error = 0; xfs_dir3_leaf_check(dp, 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_dir3_leaf_log_tail(args, lbp); xfs_dir3_leaf_log_bests(args, 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 != args->geo->datablk) dbp = NULL; xfs_dir3_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 */ { struct xfs_buf *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 */ struct xfs_buf *lbp; /* leaf buffer */ xfs_dir2_leaf_t *leaf; /* leaf structure */ xfs_dir2_leaf_entry_t *lep; /* leaf entry */ xfs_trans_t *tp; /* transaction pointer */ struct xfs_dir2_leaf_entry *ents; 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->b_addr; ents = dp->d_ops->leaf_ents_p(leaf); /* * Point to the leaf entry, get data address from it. */ lep = &ents[index]; /* * Point to the data entry. */ dep = (xfs_dir2_data_entry_t *) ((char *)dbp->b_addr + xfs_dir2_dataptr_to_off(args->geo, 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); dp->d_ops->data_put_ftype(dep, args->filetype); tp = args->trans; xfs_dir2_data_log_entry(args, dbp, dep); xfs_dir3_leaf_check(dp, lbp); xfs_trans_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 */ struct xfs_buf *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 */ struct xfs_dir2_leaf_entry *ents; struct xfs_dir3_icleaf_hdr leafhdr; leaf = lbp->b_addr; ents = args->dp->d_ops->leaf_ents_p(leaf); args->dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); /* * 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 = ents, low = 0, high = leafhdr.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 */ struct xfs_buf *lbp, /* leaf buffer */ xfs_dir2_db_t db) /* data block number */ { __be16 *bestsp; /* leaf bests table */ struct xfs_buf *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_trans_t *tp; /* transaction pointer */ dp = args->dp; tp = args->trans; /* * Read the offending data block. We need its buffer. */ error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(args->geo, db), -1, &dbp); if (error) return error; leaf = lbp->b_addr; ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); #ifdef DEBUG { struct xfs_dir2_data_hdr *hdr = dbp->b_addr; struct xfs_dir2_data_free *bf = dp->d_ops->data_bestfree_p(hdr); ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC)); ASSERT(be16_to_cpu(bf[0].length) == args->geo->blksize - dp->d_ops->data_entry_offset); 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_trans_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_dir3_leaf_log_tail(args, lbp); xfs_dir3_leaf_log_bests(args, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); return 0; } static inline size_t xfs_dir3_leaf_size( struct xfs_dir3_icleaf_hdr *hdr, int counts) { int entries; int hdrsize; entries = hdr->count - hdr->stale; if (hdr->magic == XFS_DIR2_LEAF1_MAGIC || hdr->magic == XFS_DIR2_LEAFN_MAGIC) hdrsize = sizeof(struct xfs_dir2_leaf_hdr); else hdrsize = sizeof(struct xfs_dir3_leaf_hdr); return hdrsize + 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 */ struct xfs_buf *fbp; /* buffer for freespace block */ xfs_fileoff_t fo; /* freespace file offset */ xfs_dir2_free_t *free; /* freespace structure */ struct xfs_buf *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 */ struct xfs_dir3_icleaf_hdr leafhdr; struct xfs_dir3_icfree_hdr freehdr; /* * 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(dp, &fo, XFS_DATA_FORK))) { return error; } fo -= args->geo->fsbcount; /* * 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 > args->geo->freeblk) { if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) { return error; } if (rval) fo -= args->geo->fsbcount; 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 + args->geo->blksize) return 0; lbp = state->path.blk[0].bp; leaf = lbp->b_addr; dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC || leafhdr.magic == XFS_DIR3_LEAFN_MAGIC); /* * Read the freespace block. */ error = xfs_dir2_free_read(tp, dp, args->geo->freeblk, &fbp); if (error) return error; free = fbp->b_addr; dp->d_ops->free_hdr_from_disk(&freehdr, free); ASSERT(!freehdr.firstdb); /* * Now see if the leafn and free data will fit in a leaf1. * If not, release the buffer and give up. */ if (xfs_dir3_leaf_size(&leafhdr, freehdr.nvalid) > args->geo->blksize) { xfs_trans_brelse(tp, fbp); return 0; } /* * If the leaf has any stale entries in it, compress them out. */ if (leafhdr.stale) xfs_dir3_leaf_compact(args, &leafhdr, lbp); lbp->b_ops = &xfs_dir3_leaf1_buf_ops; xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAF1_BUF); leafhdr.magic = (leafhdr.magic == XFS_DIR2_LEAFN_MAGIC) ? XFS_DIR2_LEAF1_MAGIC : XFS_DIR3_LEAF1_MAGIC; /* * Set up the leaf tail from the freespace block. */ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf); ltp->bestcount = cpu_to_be32(freehdr.nvalid); /* * Set up the leaf bests table. */ memcpy(xfs_dir2_leaf_bests_p(ltp), dp->d_ops->free_bests_p(free), freehdr.nvalid * sizeof(xfs_dir2_data_off_t)); dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr); xfs_dir3_leaf_log_header(args, lbp); xfs_dir3_leaf_log_bests(args, lbp, 0, be32_to_cpu(ltp->bestcount) - 1); xfs_dir3_leaf_log_tail(args, lbp); xfs_dir3_leaf_check(dp, lbp); /* * Get rid of the freespace block. */ error = xfs_dir2_shrink_inode(args, xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET), 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; }