diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_dir2_leaf.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_dir2_leaf.c | 1815 |
1 files changed, 1815 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2_leaf.c b/fs/xfs/libxfs/xfs_dir2_leaf.c new file mode 100644 index 000000000..95d2a3f92 --- /dev/null +++ b/fs/xfs/libxfs/xfs_dir2_leaf.c @@ -0,0 +1,1815 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * Copyright (c) 2013 Red Hat, Inc. + * All Rights Reserved. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.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" + +/* + * 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, + struct xfs_dir3_icleaf_hdr *leafhdr); +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); + +void +xfs_dir2_leaf_hdr_from_disk( + struct xfs_mount *mp, + struct xfs_dir3_icleaf_hdr *to, + struct xfs_dir2_leaf *from) +{ + if (xfs_sb_version_hascrc(&mp->m_sb)) { + struct xfs_dir3_leaf *from3 = (struct xfs_dir3_leaf *)from; + + to->forw = be32_to_cpu(from3->hdr.info.hdr.forw); + to->back = be32_to_cpu(from3->hdr.info.hdr.back); + to->magic = be16_to_cpu(from3->hdr.info.hdr.magic); + to->count = be16_to_cpu(from3->hdr.count); + to->stale = be16_to_cpu(from3->hdr.stale); + to->ents = from3->__ents; + + ASSERT(to->magic == XFS_DIR3_LEAF1_MAGIC || + to->magic == XFS_DIR3_LEAFN_MAGIC); + } else { + to->forw = be32_to_cpu(from->hdr.info.forw); + to->back = be32_to_cpu(from->hdr.info.back); + to->magic = be16_to_cpu(from->hdr.info.magic); + to->count = be16_to_cpu(from->hdr.count); + to->stale = be16_to_cpu(from->hdr.stale); + to->ents = from->__ents; + + ASSERT(to->magic == XFS_DIR2_LEAF1_MAGIC || + to->magic == XFS_DIR2_LEAFN_MAGIC); + } +} + +void +xfs_dir2_leaf_hdr_to_disk( + struct xfs_mount *mp, + struct xfs_dir2_leaf *to, + struct xfs_dir3_icleaf_hdr *from) +{ + if (xfs_sb_version_hascrc(&mp->m_sb)) { + struct xfs_dir3_leaf *to3 = (struct xfs_dir3_leaf *)to; + + ASSERT(from->magic == XFS_DIR3_LEAF1_MAGIC || + from->magic == XFS_DIR3_LEAFN_MAGIC); + + to3->hdr.info.hdr.forw = cpu_to_be32(from->forw); + to3->hdr.info.hdr.back = cpu_to_be32(from->back); + to3->hdr.info.hdr.magic = cpu_to_be16(from->magic); + to3->hdr.count = cpu_to_be16(from->count); + to3->hdr.stale = cpu_to_be16(from->stale); + } else { + ASSERT(from->magic == XFS_DIR2_LEAF1_MAGIC || + from->magic == XFS_DIR2_LEAFN_MAGIC); + + to->hdr.info.forw = cpu_to_be32(from->forw); + to->hdr.info.back = cpu_to_be32(from->back); + to->hdr.info.magic = cpu_to_be16(from->magic); + to->hdr.count = cpu_to_be16(from->count); + to->hdr.stale = cpu_to_be16(from->stale); + } +} + +/* + * Check the internal consistency of a leaf1 block. + * Pop an assert if something is wrong. + */ +#ifdef DEBUG +static xfs_failaddr_t +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; + + xfs_dir2_leaf_hdr_from_disk(dp->i_mount, &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 __this_address; + } else if (leafhdr.magic != XFS_DIR2_LEAF1_MAGIC) + return __this_address; + + return xfs_dir3_leaf_check_int(dp->i_mount, &leafhdr, leaf); +} + +static inline void +xfs_dir3_leaf_check( + struct xfs_inode *dp, + struct xfs_buf *bp) +{ + xfs_failaddr_t fa; + + fa = xfs_dir3_leaf1_check(dp, bp); + if (!fa) + return; + xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, dp->i_mount, + bp->b_addr, BBTOB(bp->b_length), __FILE__, __LINE__, + fa); + ASSERT(0); +} +#else +#define xfs_dir3_leaf_check(dp, bp) +#endif + +xfs_failaddr_t +xfs_dir3_leaf_check_int( + struct xfs_mount *mp, + struct xfs_dir3_icleaf_hdr *hdr, + struct xfs_dir2_leaf *leaf) +{ + struct xfs_da_geometry *geo = mp->m_dir_geo; + xfs_dir2_leaf_tail_t *ltp; + int stale; + int i; + + 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 > geo->leaf_max_ents) + return __this_address; + + /* Leaves and bests don't overlap in leaf format. */ + if ((hdr->magic == XFS_DIR2_LEAF1_MAGIC || + hdr->magic == XFS_DIR3_LEAF1_MAGIC) && + (char *)&hdr->ents[hdr->count] > (char *)xfs_dir2_leaf_bests_p(ltp)) + return __this_address; + + /* Check hash value order, count stale entries. */ + for (i = stale = 0; i < hdr->count; i++) { + if (i + 1 < hdr->count) { + if (be32_to_cpu(hdr->ents[i].hashval) > + be32_to_cpu(hdr->ents[i + 1].hashval)) + return __this_address; + } + if (hdr->ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) + stale++; + } + if (hdr->stale != stale) + return __this_address; + return NULL; +} + +/* + * 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 xfs_failaddr_t +xfs_dir3_leaf_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + struct xfs_dir3_icleaf_hdr leafhdr; + xfs_failaddr_t fa; + + fa = xfs_da3_blkinfo_verify(bp, bp->b_addr); + if (fa) + return fa; + + xfs_dir2_leaf_hdr_from_disk(mp, &leafhdr, bp->b_addr); + return xfs_dir3_leaf_check_int(mp, &leafhdr, bp->b_addr); +} + +static void +xfs_dir3_leaf_read_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + xfs_failaddr_t fa; + + if (xfs_sb_version_hascrc(&mp->m_sb) && + !xfs_buf_verify_cksum(bp, XFS_DIR3_LEAF_CRC_OFF)) + xfs_verifier_error(bp, -EFSBADCRC, __this_address); + else { + fa = xfs_dir3_leaf_verify(bp); + if (fa) + xfs_verifier_error(bp, -EFSCORRUPTED, fa); + } +} + +static void +xfs_dir3_leaf_write_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + struct xfs_buf_log_item *bip = bp->b_log_item; + struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr; + xfs_failaddr_t fa; + + fa = xfs_dir3_leaf_verify(bp); + if (fa) { + xfs_verifier_error(bp, -EFSCORRUPTED, fa); + 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); +} + +const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops = { + .name = "xfs_dir3_leaf1", + .magic16 = { cpu_to_be16(XFS_DIR2_LEAF1_MAGIC), + cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) }, + .verify_read = xfs_dir3_leaf_read_verify, + .verify_write = xfs_dir3_leaf_write_verify, + .verify_struct = xfs_dir3_leaf_verify, +}; + +const struct xfs_buf_ops xfs_dir3_leafn_buf_ops = { + .name = "xfs_dir3_leafn", + .magic16 = { cpu_to_be16(XFS_DIR2_LEAFN_MAGIC), + cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) }, + .verify_read = xfs_dir3_leaf_read_verify, + .verify_write = xfs_dir3_leaf_write_verify, + .verify_struct = xfs_dir3_leaf_verify, +}; + +int +xfs_dir3_leaf_read( + struct xfs_trans *tp, + struct xfs_inode *dp, + xfs_dablk_t fbno, + struct xfs_buf **bpp) +{ + int err; + + err = xfs_da_read_buf(tp, dp, fbno, 0, bpp, XFS_DATA_FORK, + &xfs_dir3_leaf1_buf_ops); + if (!err && tp && *bpp) + 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, + struct xfs_buf **bpp) +{ + int err; + + err = xfs_da_read_buf(tp, dp, fbno, 0, bpp, XFS_DATA_FORK, + &xfs_dir3_leafn_buf_ops); + if (!err && tp && *bpp) + 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_meta_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), + &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_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 = xfs_dir2_data_bestfree_p(dp->i_mount, hdr); + + /* + * Set the counts in the leaf header. + */ + xfs_dir2_leaf_hdr_from_disk(dp->i_mount, &leafhdr, leaf); + leafhdr.count = be32_to_cpu(btp->count); + leafhdr.stale = be32_to_cpu(btp->stale); + xfs_dir2_leaf_hdr_to_disk(dp->i_mount, 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(leafhdr.ents, blp, + be32_to_cpu(btp->count) * sizeof(struct xfs_dir2_leaf_entry)); + xfs_dir3_leaf_log_ents(args, &leafhdr, 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->i_mount, 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( + struct xfs_da_args *args) /* operation arguments */ +{ + struct xfs_dir3_icleaf_hdr leafhdr; + struct xfs_trans *tp = args->trans; + __be16 *bestsp; /* freespace table in leaf */ + __be16 *tagp; /* end of data entry */ + struct xfs_buf *dbp; /* data block buffer */ + struct xfs_buf *lbp; /* leaf's buffer */ + struct xfs_dir2_leaf *leaf; /* leaf structure */ + struct xfs_inode *dp = args->dp; /* incore directory inode */ + struct xfs_dir2_data_hdr *hdr; /* data block header */ + struct xfs_dir2_data_entry *dep; /* data block entry */ + struct xfs_dir2_leaf_entry *lep; /* leaf entry table pointer */ + struct xfs_dir2_leaf_entry *ents; + struct xfs_dir2_data_unused *dup; /* data unused entry */ + struct xfs_dir2_leaf_tail *ltp; /* leaf tail pointer */ + struct xfs_dir2_data_free *bf; /* bestfree table */ + int compact; /* need to compact leaves */ + int error; /* error return value */ + int grown; /* allocated new data block */ + int highstale = 0; /* index of next stale leaf */ + int i; /* temporary, index */ + int index; /* leaf table position */ + int length; /* length of new entry */ + int lfloglow; /* low leaf logging index */ + int lfloghigh; /* high leaf logging index */ + int lowstale = 0; /* index of prev stale leaf */ + int needbytes; /* leaf block bytes needed */ + int needlog; /* need to log data header */ + int needscan; /* need to rescan data free */ + xfs_dir2_db_t use_block; /* data block number */ + + trace_xfs_dir2_leaf_addname(args); + + error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, &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); + xfs_dir2_leaf_hdr_from_disk(dp->i_mount, &leafhdr, leaf); + ents = leafhdr.ents; + bestsp = xfs_dir2_leaf_bests_p(ltp); + length = xfs_dir2_data_entsize(dp->i_mount, 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 = xfs_dir2_data_bestfree_p(dp->i_mount, 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), + 0, &dbp); + if (error) { + xfs_trans_brelse(tp, lbp); + return error; + } + hdr = dbp->b_addr; + bf = xfs_dir2_data_bestfree_p(dp->i_mount, 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)); + needscan = needlog = 0; + /* + * Mark the initial part of our freespace in use for the new entry. + */ + error = xfs_dir2_data_use_free(args, dbp, dup, + (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), + length, &needlog, &needscan); + if (error) { + xfs_trans_brelse(tp, lbp); + return error; + } + /* + * 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); + xfs_dir2_data_put_ftype(dp->i_mount, dep, args->filetype); + tagp = xfs_dir2_data_entry_tag_p(dp->i_mount, dep); + *tagp = cpu_to_be16((char *)dep - (char *)hdr); + /* + * Need to scan fix up the bestfree table. + */ + if (needscan) + xfs_dir2_data_freescan(dp->i_mount, 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. + */ + xfs_dir2_leaf_hdr_to_disk(dp->i_mount, leaf, &leafhdr); + xfs_dir3_leaf_log_header(args, lbp); + xfs_dir3_leaf_log_ents(args, &leafhdr, 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_inode *dp = args->dp; + + leaf = bp->b_addr; + if (!leafhdr->stale) + return; + + /* + * Compress out the stale entries in place. + */ + for (from = to = 0, loglow = -1; from < leafhdr->count; from++) { + if (leafhdr->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; + leafhdr->ents[to] = leafhdr->ents[from]; + } + to++; + } + /* + * Update and log the header, log the leaf entries. + */ + ASSERT(leafhdr->stale == from - to); + leafhdr->count -= leafhdr->stale; + leafhdr->stale = 0; + + xfs_dir2_leaf_hdr_to_disk(dp->i_mount, leaf, leafhdr); + xfs_dir3_leaf_log_header(args, bp); + if (loglow != -1) + xfs_dir3_leaf_log_ents(args, leafhdr, 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_dir3_icleaf_hdr *hdr, + 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; + + 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)); + + firstlep = &hdr->ents[first]; + lastlep = &hdr->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->geo->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_entry_t *lep; /* leaf entry */ + xfs_trans_t *tp; /* transaction pointer */ + struct xfs_dir3_icleaf_hdr leafhdr; + + trace_xfs_dir2_leaf_lookup(args); + + /* + * Look up name in the leaf block, returning both buffers and index. + */ + error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp, &leafhdr); + if (error) + return error; + + tp = args->trans; + dp = args->dp; + xfs_dir3_leaf_check(dp, lbp); + + /* + * Get to the leaf entry and contained data entry address. + */ + lep = &leafhdr.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 = xfs_dir2_data_get_ftype(dp->i_mount, 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 */ + struct xfs_dir3_icleaf_hdr *leafhdr) +{ + 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 */ + + dp = args->dp; + tp = args->trans; + mp = dp->i_mount; + + error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, &lbp); + if (error) + return error; + + *lbpp = lbp; + leaf = lbp->b_addr; + xfs_dir3_leaf_check(dp, lbp); + xfs_dir2_leaf_hdr_from_disk(mp, 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 = &leafhdr->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), + 0, &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 = xfs_dir2_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), + 0, &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 */ +{ + struct xfs_da_geometry *geo = args->geo; + __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_dir3_icleaf_hdr leafhdr; + + trace_xfs_dir2_leaf_removename(args); + + /* + * Lookup the leaf entry, get the leaf and data blocks read in. + */ + error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp, &leafhdr); + if (error) + return error; + + dp = args->dp; + leaf = lbp->b_addr; + hdr = dbp->b_addr; + xfs_dir3_data_check(dp, dbp); + bf = xfs_dir2_data_bestfree_p(dp->i_mount, hdr); + + /* + * Point to the leaf entry, use that to point to the data entry. + */ + lep = &leafhdr.ents[index]; + db = xfs_dir2_dataptr_to_db(geo, be32_to_cpu(lep->address)); + dep = (xfs_dir2_data_entry_t *)((char *)hdr + + xfs_dir2_dataptr_to_off(geo, be32_to_cpu(lep->address))); + needscan = needlog = 0; + oldbest = be16_to_cpu(bf[0].length); + ltp = xfs_dir2_leaf_tail_p(geo, leaf); + bestsp = xfs_dir2_leaf_bests_p(ltp); + if (be16_to_cpu(bestsp[db]) != oldbest) { + xfs_buf_mark_corrupt(lbp); + return -EFSCORRUPTED; + } + /* + * Mark the former data entry unused. + */ + xfs_dir2_data_make_free(args, dbp, + (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr), + xfs_dir2_data_entsize(dp->i_mount, dep->namelen), &needlog, + &needscan); + /* + * We just mark the leaf entry stale by putting a null in it. + */ + leafhdr.stale++; + xfs_dir2_leaf_hdr_to_disk(dp->i_mount, leaf, &leafhdr); + xfs_dir3_leaf_log_header(args, lbp); + + lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); + xfs_dir3_leaf_log_ents(args, &leafhdr, 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->i_mount, 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) == + geo->blksize - geo->data_entry_offset) { + ASSERT(db != 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 != 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_entry_t *lep; /* leaf entry */ + xfs_trans_t *tp; /* transaction pointer */ + struct xfs_dir3_icleaf_hdr leafhdr; + + trace_xfs_dir2_leaf_replace(args); + + /* + * Look up the entry. + */ + error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp, &leafhdr); + if (error) + return error; + + dp = args->dp; + /* + * Point to the leaf entry, get data address from it. + */ + lep = &leafhdr.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); + xfs_dir2_data_put_ftype(dp->i_mount, 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_entry_t *lep; /* leaf entry */ + int mid=0; /* current leaf index */ + struct xfs_dir3_icleaf_hdr leafhdr; + + xfs_dir2_leaf_hdr_from_disk(args->dp->i_mount, &leafhdr, lbp->b_addr); + + /* + * 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 = leafhdr.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 */ +{ + struct xfs_da_geometry *geo = args->geo; + __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(geo, db), 0, &dbp); + if (error) + return error; + + leaf = lbp->b_addr; + ltp = xfs_dir2_leaf_tail_p(geo, leaf); + +#ifdef DEBUG +{ + struct xfs_dir2_data_hdr *hdr = dbp->b_addr; + struct xfs_dir2_data_free *bf = + xfs_dir2_data_bestfree_p(dp->i_mount, 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) == + geo->blksize - geo->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 */ + 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; + xfs_dir2_leaf_hdr_from_disk(mp, &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; + xfs_dir2_free_hdr_from_disk(mp, &freehdr, fbp->b_addr); + + 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), freehdr.bests, + freehdr.nvalid * sizeof(xfs_dir2_data_off_t)); + + xfs_dir2_leaf_hdr_to_disk(mp, 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; +} |