| /* |
| * 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_types.h" |
| #include "xfs_log.h" |
| #include "xfs_trans.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_mount.h" |
| #include "xfs_da_btree.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_inode_item.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_dir2.h" |
| #include "xfs_dir2_format.h" |
| #include "xfs_dir2_priv.h" |
| #include "xfs_error.h" |
| #include "xfs_trace.h" |
| #include "xfs_cksum.h" |
| |
| /* |
| * Local function prototypes. |
| */ |
| static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, struct xfs_buf *bp, |
| int first, int last); |
| static void xfs_dir2_block_log_tail(xfs_trans_t *tp, struct xfs_buf *bp); |
| static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, struct xfs_buf **bpp, |
| int *entno); |
| static int xfs_dir2_block_sort(const void *a, const void *b); |
| |
| static xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot; |
| |
| /* |
| * One-time startup routine called from xfs_init(). |
| */ |
| void |
| xfs_dir_startup(void) |
| { |
| xfs_dir_hash_dot = xfs_da_hashname((unsigned char *)".", 1); |
| xfs_dir_hash_dotdot = xfs_da_hashname((unsigned char *)"..", 2); |
| } |
| |
| static bool |
| xfs_dir3_block_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| if (hdr3->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) |
| return false; |
| if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid)) |
| return false; |
| if (be64_to_cpu(hdr3->blkno) != bp->b_bn) |
| return false; |
| } else { |
| if (hdr3->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) |
| return false; |
| } |
| if (__xfs_dir3_data_check(NULL, bp)) |
| return false; |
| return true; |
| } |
| |
| static void |
| xfs_dir3_block_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| if ((xfs_sb_version_hascrc(&mp->m_sb) && |
| !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), |
| XFS_DIR3_DATA_CRC_OFF)) || |
| !xfs_dir3_block_verify(bp)) { |
| XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| xfs_buf_ioerror(bp, EFSCORRUPTED); |
| } |
| } |
| |
| static void |
| xfs_dir3_block_write_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_buf_log_item *bip = bp->b_fspriv; |
| struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
| |
| if (!xfs_dir3_block_verify(bp)) { |
| XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| xfs_buf_ioerror(bp, EFSCORRUPTED); |
| return; |
| } |
| |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return; |
| |
| if (bip) |
| hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| |
| xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_DATA_CRC_OFF); |
| } |
| |
| const struct xfs_buf_ops xfs_dir3_block_buf_ops = { |
| .verify_read = xfs_dir3_block_read_verify, |
| .verify_write = xfs_dir3_block_write_verify, |
| }; |
| |
| static int |
| xfs_dir3_block_read( |
| struct xfs_trans *tp, |
| struct xfs_inode *dp, |
| struct xfs_buf **bpp) |
| { |
| struct xfs_mount *mp = dp->i_mount; |
| int err; |
| |
| err = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, bpp, |
| XFS_DATA_FORK, &xfs_dir3_block_buf_ops); |
| if (!err && tp) |
| xfs_trans_buf_set_type(tp, *bpp, XFS_BLF_DIR_BLOCK_BUF); |
| return err; |
| } |
| |
| static void |
| xfs_dir3_block_init( |
| struct xfs_mount *mp, |
| struct xfs_trans *tp, |
| struct xfs_buf *bp, |
| struct xfs_inode *dp) |
| { |
| struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; |
| |
| bp->b_ops = &xfs_dir3_block_buf_ops; |
| xfs_trans_buf_set_type(tp, bp, XFS_BLF_DIR_BLOCK_BUF); |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| memset(hdr3, 0, sizeof(*hdr3)); |
| hdr3->magic = cpu_to_be32(XFS_DIR3_BLOCK_MAGIC); |
| hdr3->blkno = cpu_to_be64(bp->b_bn); |
| hdr3->owner = cpu_to_be64(dp->i_ino); |
| uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid); |
| return; |
| |
| } |
| hdr3->magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC); |
| } |
| |
| static void |
| xfs_dir2_block_need_space( |
| struct xfs_dir2_data_hdr *hdr, |
| struct xfs_dir2_block_tail *btp, |
| struct xfs_dir2_leaf_entry *blp, |
| __be16 **tagpp, |
| struct xfs_dir2_data_unused **dupp, |
| struct xfs_dir2_data_unused **enddupp, |
| int *compact, |
| int len) |
| { |
| struct xfs_dir2_data_free *bf; |
| __be16 *tagp = NULL; |
| struct xfs_dir2_data_unused *dup = NULL; |
| struct xfs_dir2_data_unused *enddup = NULL; |
| |
| *compact = 0; |
| bf = xfs_dir3_data_bestfree_p(hdr); |
| |
| /* |
| * If there are stale entries we'll use one for the leaf. |
| */ |
| if (btp->stale) { |
| if (be16_to_cpu(bf[0].length) >= len) { |
| /* |
| * The biggest entry enough to avoid compaction. |
| */ |
| dup = (xfs_dir2_data_unused_t *) |
| ((char *)hdr + be16_to_cpu(bf[0].offset)); |
| goto out; |
| } |
| |
| /* |
| * Will need to compact to make this work. |
| * Tag just before the first leaf entry. |
| */ |
| *compact = 1; |
| tagp = (__be16 *)blp - 1; |
| |
| /* Data object just before the first leaf entry. */ |
| dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); |
| |
| /* |
| * If it's not free then the data will go where the |
| * leaf data starts now, if it works at all. |
| */ |
| if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) * |
| (uint)sizeof(*blp) < len) |
| dup = NULL; |
| } else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len) |
| dup = NULL; |
| else |
| dup = (xfs_dir2_data_unused_t *)blp; |
| goto out; |
| } |
| |
| /* |
| * no stale entries, so just use free space. |
| * Tag just before the first leaf entry. |
| */ |
| tagp = (__be16 *)blp - 1; |
| |
| /* Data object just before the first leaf entry. */ |
| enddup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); |
| |
| /* |
| * If it's not free then can't do this add without cleaning up: |
| * the space before the first leaf entry needs to be free so it |
| * can be expanded to hold the pointer to the new entry. |
| */ |
| if (be16_to_cpu(enddup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| /* |
| * Check out the biggest freespace and see if it's the same one. |
| */ |
| dup = (xfs_dir2_data_unused_t *) |
| ((char *)hdr + be16_to_cpu(bf[0].offset)); |
| if (dup != enddup) { |
| /* |
| * Not the same free entry, just check its length. |
| */ |
| if (be16_to_cpu(dup->length) < len) |
| dup = NULL; |
| goto out; |
| } |
| |
| /* |
| * It is the biggest freespace, can it hold the leaf too? |
| */ |
| if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) { |
| /* |
| * Yes, use the second-largest entry instead if it works. |
| */ |
| if (be16_to_cpu(bf[1].length) >= len) |
| dup = (xfs_dir2_data_unused_t *) |
| ((char *)hdr + be16_to_cpu(bf[1].offset)); |
| else |
| dup = NULL; |
| } |
| } |
| out: |
| *tagpp = tagp; |
| *dupp = dup; |
| *enddupp = enddup; |
| } |
| |
| /* |
| * compact the leaf entries. |
| * Leave the highest-numbered stale entry stale. |
| * XXX should be the one closest to mid but mid is not yet computed. |
| */ |
| static void |
| xfs_dir2_block_compact( |
| struct xfs_trans *tp, |
| struct xfs_buf *bp, |
| struct xfs_dir2_data_hdr *hdr, |
| struct xfs_dir2_block_tail *btp, |
| struct xfs_dir2_leaf_entry *blp, |
| int *needlog, |
| int *lfloghigh, |
| int *lfloglow) |
| { |
| int fromidx; /* source leaf index */ |
| int toidx; /* target leaf index */ |
| int needscan = 0; |
| int highstale; /* high stale index */ |
| |
| fromidx = toidx = be32_to_cpu(btp->count) - 1; |
| highstale = *lfloghigh = -1; |
| for (; fromidx >= 0; fromidx--) { |
| if (blp[fromidx].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) { |
| if (highstale == -1) |
| highstale = toidx; |
| else { |
| if (*lfloghigh == -1) |
| *lfloghigh = toidx; |
| continue; |
| } |
| } |
| if (fromidx < toidx) |
| blp[toidx] = blp[fromidx]; |
| toidx--; |
| } |
| *lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1); |
| *lfloghigh -= be32_to_cpu(btp->stale) - 1; |
| be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1)); |
| xfs_dir2_data_make_free(tp, bp, |
| (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr), |
| (xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)), |
| needlog, &needscan); |
| blp += be32_to_cpu(btp->stale) - 1; |
| btp->stale = cpu_to_be32(1); |
| /* |
| * If we now need to rebuild the bestfree map, do so. |
| * This needs to happen before the next call to use_free. |
| */ |
| if (needscan) |
| xfs_dir2_data_freescan(tp->t_mountp, hdr, needlog); |
| } |
| |
| /* |
| * Add an entry to a block directory. |
| */ |
| int /* error */ |
| xfs_dir2_block_addname( |
| xfs_da_args_t *args) /* directory op arguments */ |
| { |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ |
| struct xfs_buf *bp; /* buffer for block */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| int compact; /* need to compact leaf ents */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_inode_t *dp; /* directory inode */ |
| xfs_dir2_data_unused_t *dup; /* block unused entry */ |
| int error; /* error return value */ |
| xfs_dir2_data_unused_t *enddup=NULL; /* unused at end of data */ |
| xfs_dahash_t hash; /* hash value of found entry */ |
| int high; /* high index for binary srch */ |
| int highstale; /* high stale index */ |
| int lfloghigh=0; /* last final leaf to log */ |
| int lfloglow=0; /* first final leaf to log */ |
| int len; /* length of the new entry */ |
| int low; /* low index for binary srch */ |
| int lowstale; /* low stale index */ |
| int mid=0; /* midpoint for binary srch */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| int needlog; /* need to log header */ |
| int needscan; /* need to rescan freespace */ |
| __be16 *tagp; /* pointer to tag value */ |
| xfs_trans_t *tp; /* transaction structure */ |
| |
| trace_xfs_dir2_block_addname(args); |
| |
| dp = args->dp; |
| tp = args->trans; |
| mp = dp->i_mount; |
| |
| /* Read the (one and only) directory block into bp. */ |
| error = xfs_dir3_block_read(tp, dp, &bp); |
| if (error) |
| return error; |
| |
| len = xfs_dir2_data_entsize(args->namelen); |
| |
| /* |
| * Set up pointers to parts of the block. |
| */ |
| hdr = bp->b_addr; |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| |
| /* |
| * Find out if we can reuse stale entries or whether we need extra |
| * space for entry and new leaf. |
| */ |
| xfs_dir2_block_need_space(hdr, btp, blp, &tagp, &dup, |
| &enddup, &compact, len); |
| |
| /* |
| * Done everything we need for a space check now. |
| */ |
| if (args->op_flags & XFS_DA_OP_JUSTCHECK) { |
| xfs_trans_brelse(tp, bp); |
| if (!dup) |
| return XFS_ERROR(ENOSPC); |
| return 0; |
| } |
| |
| /* |
| * If we don't have space for the new entry & leaf ... |
| */ |
| if (!dup) { |
| /* Don't have a space reservation: return no-space. */ |
| if (args->total == 0) |
| return XFS_ERROR(ENOSPC); |
| /* |
| * Convert to the next larger format. |
| * Then add the new entry in that format. |
| */ |
| error = xfs_dir2_block_to_leaf(args, bp); |
| if (error) |
| return error; |
| return xfs_dir2_leaf_addname(args); |
| } |
| |
| needlog = needscan = 0; |
| |
| /* |
| * If need to compact the leaf entries, do it now. |
| */ |
| if (compact) { |
| xfs_dir2_block_compact(tp, bp, hdr, btp, blp, &needlog, |
| &lfloghigh, &lfloglow); |
| /* recalculate blp post-compaction */ |
| blp = xfs_dir2_block_leaf_p(btp); |
| } else if (btp->stale) { |
| /* |
| * Set leaf logging boundaries to impossible state. |
| * For the no-stale case they're set explicitly. |
| */ |
| lfloglow = be32_to_cpu(btp->count); |
| lfloghigh = -1; |
| } |
| |
| /* |
| * Find the slot that's first lower than our hash value, -1 if none. |
| */ |
| for (low = 0, high = be32_to_cpu(btp->count) - 1; low <= high; ) { |
| mid = (low + high) >> 1; |
| if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval) |
| break; |
| if (hash < args->hashval) |
| low = mid + 1; |
| else |
| high = mid - 1; |
| } |
| while (mid >= 0 && be32_to_cpu(blp[mid].hashval) >= args->hashval) { |
| mid--; |
| } |
| /* |
| * No stale entries, will use enddup space to hold new leaf. |
| */ |
| if (!btp->stale) { |
| /* |
| * Mark the space needed for the new leaf entry, now in use. |
| */ |
| xfs_dir2_data_use_free(tp, bp, enddup, |
| (xfs_dir2_data_aoff_t) |
| ((char *)enddup - (char *)hdr + be16_to_cpu(enddup->length) - |
| sizeof(*blp)), |
| (xfs_dir2_data_aoff_t)sizeof(*blp), |
| &needlog, &needscan); |
| /* |
| * Update the tail (entry count). |
| */ |
| be32_add_cpu(&btp->count, 1); |
| /* |
| * If we now need to rebuild the bestfree map, do so. |
| * This needs to happen before the next call to use_free. |
| */ |
| if (needscan) { |
| xfs_dir2_data_freescan(mp, hdr, &needlog); |
| needscan = 0; |
| } |
| /* |
| * Adjust pointer to the first leaf entry, we're about to move |
| * the table up one to open up space for the new leaf entry. |
| * Then adjust our index to match. |
| */ |
| blp--; |
| mid++; |
| if (mid) |
| memmove(blp, &blp[1], mid * sizeof(*blp)); |
| lfloglow = 0; |
| lfloghigh = mid; |
| } |
| /* |
| * Use a stale leaf for our new entry. |
| */ |
| else { |
| for (lowstale = mid; |
| lowstale >= 0 && |
| blp[lowstale].address != |
| cpu_to_be32(XFS_DIR2_NULL_DATAPTR); |
| lowstale--) |
| continue; |
| for (highstale = mid + 1; |
| highstale < be32_to_cpu(btp->count) && |
| blp[highstale].address != |
| cpu_to_be32(XFS_DIR2_NULL_DATAPTR) && |
| (lowstale < 0 || mid - lowstale > highstale - mid); |
| highstale++) |
| continue; |
| /* |
| * Move entries toward the low-numbered stale entry. |
| */ |
| if (lowstale >= 0 && |
| (highstale == be32_to_cpu(btp->count) || |
| mid - lowstale <= highstale - mid)) { |
| if (mid - lowstale) |
| memmove(&blp[lowstale], &blp[lowstale + 1], |
| (mid - lowstale) * sizeof(*blp)); |
| lfloglow = MIN(lowstale, lfloglow); |
| lfloghigh = MAX(mid, lfloghigh); |
| } |
| /* |
| * Move entries toward the high-numbered stale entry. |
| */ |
| else { |
| ASSERT(highstale < be32_to_cpu(btp->count)); |
| mid++; |
| if (highstale - mid) |
| memmove(&blp[mid + 1], &blp[mid], |
| (highstale - mid) * sizeof(*blp)); |
| lfloglow = MIN(mid, lfloglow); |
| lfloghigh = MAX(highstale, lfloghigh); |
| } |
| be32_add_cpu(&btp->stale, -1); |
| } |
| /* |
| * Point to the new data entry. |
| */ |
| dep = (xfs_dir2_data_entry_t *)dup; |
| /* |
| * Fill in the leaf entry. |
| */ |
| blp[mid].hashval = cpu_to_be32(args->hashval); |
| blp[mid].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp, |
| (char *)dep - (char *)hdr)); |
| xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh); |
| /* |
| * Mark space for the data entry used. |
| */ |
| xfs_dir2_data_use_free(tp, bp, dup, |
| (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), |
| (xfs_dir2_data_aoff_t)len, &needlog, &needscan); |
| /* |
| * Create the new data entry. |
| */ |
| dep->inumber = cpu_to_be64(args->inumber); |
| dep->namelen = args->namelen; |
| memcpy(dep->name, args->name, args->namelen); |
| tagp = xfs_dir2_data_entry_tag_p(dep); |
| *tagp = cpu_to_be16((char *)dep - (char *)hdr); |
| /* |
| * Clean up the bestfree array and log the header, tail, and entry. |
| */ |
| if (needscan) |
| xfs_dir2_data_freescan(mp, hdr, &needlog); |
| if (needlog) |
| xfs_dir2_data_log_header(tp, bp); |
| xfs_dir2_block_log_tail(tp, bp); |
| xfs_dir2_data_log_entry(tp, bp, dep); |
| xfs_dir3_data_check(dp, bp); |
| return 0; |
| } |
| |
| /* |
| * Readdir for block directories. |
| */ |
| int /* error */ |
| xfs_dir2_block_getdents( |
| xfs_inode_t *dp, /* incore inode */ |
| void *dirent, |
| xfs_off_t *offset, |
| filldir_t filldir) |
| { |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| struct xfs_buf *bp; /* buffer for block */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_dir2_data_unused_t *dup; /* block unused entry */ |
| char *endptr; /* end of the data entries */ |
| int error; /* error return value */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| char *ptr; /* current data entry */ |
| int wantoff; /* starting block offset */ |
| xfs_off_t cook; |
| |
| mp = dp->i_mount; |
| /* |
| * If the block number in the offset is out of range, we're done. |
| */ |
| if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk) |
| return 0; |
| |
| error = xfs_dir3_block_read(NULL, dp, &bp); |
| if (error) |
| return error; |
| |
| /* |
| * Extract the byte offset we start at from the seek pointer. |
| * We'll skip entries before this. |
| */ |
| wantoff = xfs_dir2_dataptr_to_off(mp, *offset); |
| hdr = bp->b_addr; |
| xfs_dir3_data_check(dp, bp); |
| /* |
| * Set up values for the loop. |
| */ |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| ptr = (char *)xfs_dir3_data_entry_p(hdr); |
| endptr = (char *)xfs_dir2_block_leaf_p(btp); |
| |
| /* |
| * Loop over the data portion of the block. |
| * Each object is a real entry (dep) or an unused one (dup). |
| */ |
| while (ptr < endptr) { |
| dup = (xfs_dir2_data_unused_t *)ptr; |
| /* |
| * Unused, skip it. |
| */ |
| if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| ptr += be16_to_cpu(dup->length); |
| continue; |
| } |
| |
| dep = (xfs_dir2_data_entry_t *)ptr; |
| |
| /* |
| * Bump pointer for the next iteration. |
| */ |
| ptr += xfs_dir2_data_entsize(dep->namelen); |
| /* |
| * The entry is before the desired starting point, skip it. |
| */ |
| if ((char *)dep - (char *)hdr < wantoff) |
| continue; |
| |
| cook = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk, |
| (char *)dep - (char *)hdr); |
| |
| /* |
| * If it didn't fit, set the final offset to here & return. |
| */ |
| if (filldir(dirent, (char *)dep->name, dep->namelen, |
| cook & 0x7fffffff, be64_to_cpu(dep->inumber), |
| DT_UNKNOWN)) { |
| *offset = cook & 0x7fffffff; |
| xfs_trans_brelse(NULL, bp); |
| return 0; |
| } |
| } |
| |
| /* |
| * Reached the end of the block. |
| * Set the offset to a non-existent block 1 and return. |
| */ |
| *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) & |
| 0x7fffffff; |
| xfs_trans_brelse(NULL, bp); |
| return 0; |
| } |
| |
| /* |
| * Log leaf entries from the block. |
| */ |
| static void |
| xfs_dir2_block_log_leaf( |
| xfs_trans_t *tp, /* transaction structure */ |
| struct xfs_buf *bp, /* block buffer */ |
| int first, /* index of first logged leaf */ |
| int last) /* index of last logged leaf */ |
| { |
| xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
| xfs_dir2_leaf_entry_t *blp; |
| xfs_dir2_block_tail_t *btp; |
| |
| btp = xfs_dir2_block_tail_p(tp->t_mountp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| xfs_trans_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)hdr), |
| (uint)((char *)&blp[last + 1] - (char *)hdr - 1)); |
| } |
| |
| /* |
| * Log the block tail. |
| */ |
| static void |
| xfs_dir2_block_log_tail( |
| xfs_trans_t *tp, /* transaction structure */ |
| struct xfs_buf *bp) /* block buffer */ |
| { |
| xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
| xfs_dir2_block_tail_t *btp; |
| |
| btp = xfs_dir2_block_tail_p(tp->t_mountp, hdr); |
| xfs_trans_log_buf(tp, bp, (uint)((char *)btp - (char *)hdr), |
| (uint)((char *)(btp + 1) - (char *)hdr - 1)); |
| } |
| |
| /* |
| * Look up an entry in the block. This is the external routine, |
| * xfs_dir2_block_lookup_int does the real work. |
| */ |
| int /* error */ |
| xfs_dir2_block_lookup( |
| xfs_da_args_t *args) /* dir lookup arguments */ |
| { |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ |
| struct xfs_buf *bp; /* block buffer */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_inode_t *dp; /* incore inode */ |
| int ent; /* entry index */ |
| int error; /* error return value */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| |
| trace_xfs_dir2_block_lookup(args); |
| |
| /* |
| * Get the buffer, look up the entry. |
| * If not found (ENOENT) then return, have no buffer. |
| */ |
| if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) |
| return error; |
| dp = args->dp; |
| mp = dp->i_mount; |
| hdr = bp->b_addr; |
| xfs_dir3_data_check(dp, bp); |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| /* |
| * Get the offset from the leaf entry, to point to the data. |
| */ |
| dep = (xfs_dir2_data_entry_t *)((char *)hdr + |
| xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address))); |
| /* |
| * Fill in inode number, CI name if appropriate, release the block. |
| */ |
| args->inumber = be64_to_cpu(dep->inumber); |
| error = xfs_dir_cilookup_result(args, dep->name, dep->namelen); |
| xfs_trans_brelse(args->trans, bp); |
| return XFS_ERROR(error); |
| } |
| |
| /* |
| * Internal block lookup routine. |
| */ |
| static int /* error */ |
| xfs_dir2_block_lookup_int( |
| xfs_da_args_t *args, /* dir lookup arguments */ |
| struct xfs_buf **bpp, /* returned block buffer */ |
| int *entno) /* returned entry number */ |
| { |
| xfs_dir2_dataptr_t addr; /* data entry address */ |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ |
| struct xfs_buf *bp; /* block buffer */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_inode_t *dp; /* incore inode */ |
| int error; /* error return value */ |
| xfs_dahash_t hash; /* found hash value */ |
| int high; /* binary search high index */ |
| int low; /* binary search low index */ |
| int mid; /* binary search current idx */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| xfs_trans_t *tp; /* transaction pointer */ |
| enum xfs_dacmp cmp; /* comparison result */ |
| |
| dp = args->dp; |
| tp = args->trans; |
| mp = dp->i_mount; |
| |
| error = xfs_dir3_block_read(tp, dp, &bp); |
| if (error) |
| return error; |
| |
| hdr = bp->b_addr; |
| xfs_dir3_data_check(dp, bp); |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| /* |
| * Loop doing a binary search for our hash value. |
| * Find our entry, ENOENT if it's not there. |
| */ |
| for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) { |
| ASSERT(low <= high); |
| mid = (low + high) >> 1; |
| if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval) |
| break; |
| if (hash < args->hashval) |
| low = mid + 1; |
| else |
| high = mid - 1; |
| if (low > high) { |
| ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); |
| xfs_trans_brelse(tp, bp); |
| return XFS_ERROR(ENOENT); |
| } |
| } |
| /* |
| * Back up to the first one with the right hash value. |
| */ |
| while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) { |
| mid--; |
| } |
| /* |
| * Now loop forward through all the entries with the |
| * right hash value looking for our name. |
| */ |
| do { |
| if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR) |
| continue; |
| /* |
| * Get pointer to the entry from the leaf. |
| */ |
| dep = (xfs_dir2_data_entry_t *) |
| ((char *)hdr + xfs_dir2_dataptr_to_off(mp, addr)); |
| /* |
| * 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; |
| *bpp = bp; |
| *entno = mid; |
| if (cmp == XFS_CMP_EXACT) |
| return 0; |
| } |
| } while (++mid < be32_to_cpu(btp->count) && |
| be32_to_cpu(blp[mid].hashval) == hash); |
| |
| ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); |
| /* |
| * Here, we can only be doing a lookup (not a rename or replace). |
| * If a case-insensitive match was found earlier, return success. |
| */ |
| if (args->cmpresult == XFS_CMP_CASE) |
| return 0; |
| /* |
| * No match, release the buffer and return ENOENT. |
| */ |
| xfs_trans_brelse(tp, bp); |
| return XFS_ERROR(ENOENT); |
| } |
| |
| /* |
| * Remove an entry from a block format directory. |
| * If that makes the block small enough to fit in shortform, transform it. |
| */ |
| int /* error */ |
| xfs_dir2_block_removename( |
| xfs_da_args_t *args) /* directory operation args */ |
| { |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf pointer */ |
| struct xfs_buf *bp; /* block buffer */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_inode_t *dp; /* incore inode */ |
| int ent; /* block leaf entry index */ |
| int error; /* error return value */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| int needlog; /* need to log block header */ |
| int needscan; /* need to fixup bestfree */ |
| xfs_dir2_sf_hdr_t sfh; /* shortform header */ |
| int size; /* shortform size */ |
| xfs_trans_t *tp; /* transaction pointer */ |
| |
| trace_xfs_dir2_block_removename(args); |
| |
| /* |
| * Look up the entry in the block. Gets the buffer and entry index. |
| * It will always be there, the vnodeops level does a lookup first. |
| */ |
| if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) { |
| return error; |
| } |
| dp = args->dp; |
| tp = args->trans; |
| mp = dp->i_mount; |
| hdr = bp->b_addr; |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| /* |
| * Point to the data entry using the leaf entry. |
| */ |
| dep = (xfs_dir2_data_entry_t *) |
| ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address))); |
| /* |
| * Mark the data entry's space free. |
| */ |
| needlog = needscan = 0; |
| xfs_dir2_data_make_free(tp, bp, |
| (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr), |
| xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan); |
| /* |
| * Fix up the block tail. |
| */ |
| be32_add_cpu(&btp->stale, 1); |
| xfs_dir2_block_log_tail(tp, bp); |
| /* |
| * Remove the leaf entry by marking it stale. |
| */ |
| blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); |
| xfs_dir2_block_log_leaf(tp, bp, ent, ent); |
| /* |
| * Fix up bestfree, log the header if necessary. |
| */ |
| if (needscan) |
| xfs_dir2_data_freescan(mp, hdr, &needlog); |
| if (needlog) |
| xfs_dir2_data_log_header(tp, bp); |
| xfs_dir3_data_check(dp, bp); |
| /* |
| * See if the size as a shortform is good enough. |
| */ |
| size = xfs_dir2_block_sfsize(dp, hdr, &sfh); |
| if (size > XFS_IFORK_DSIZE(dp)) |
| return 0; |
| |
| /* |
| * If it works, do the conversion. |
| */ |
| return xfs_dir2_block_to_sf(args, bp, size, &sfh); |
| } |
| |
| /* |
| * Replace an entry in a V2 block directory. |
| * Change the inode number to the new value. |
| */ |
| int /* error */ |
| xfs_dir2_block_replace( |
| xfs_da_args_t *args) /* directory operation args */ |
| { |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ |
| struct xfs_buf *bp; /* block buffer */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_dir2_data_entry_t *dep; /* block data entry */ |
| xfs_inode_t *dp; /* incore inode */ |
| int ent; /* leaf entry index */ |
| int error; /* error return value */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| |
| trace_xfs_dir2_block_replace(args); |
| |
| /* |
| * Lookup the entry in the directory. Get buffer and entry index. |
| * This will always succeed since the caller has already done a lookup. |
| */ |
| if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) { |
| return error; |
| } |
| dp = args->dp; |
| mp = dp->i_mount; |
| hdr = bp->b_addr; |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| blp = xfs_dir2_block_leaf_p(btp); |
| /* |
| * Point to the data entry we need to change. |
| */ |
| dep = (xfs_dir2_data_entry_t *) |
| ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address))); |
| ASSERT(be64_to_cpu(dep->inumber) != args->inumber); |
| /* |
| * Change the inode number to the new value. |
| */ |
| dep->inumber = cpu_to_be64(args->inumber); |
| xfs_dir2_data_log_entry(args->trans, bp, dep); |
| xfs_dir3_data_check(dp, bp); |
| return 0; |
| } |
| |
| /* |
| * Qsort comparison routine for the block leaf entries. |
| */ |
| static int /* sort order */ |
| xfs_dir2_block_sort( |
| const void *a, /* first leaf entry */ |
| const void *b) /* second leaf entry */ |
| { |
| const xfs_dir2_leaf_entry_t *la; /* first leaf entry */ |
| const xfs_dir2_leaf_entry_t *lb; /* second leaf entry */ |
| |
| la = a; |
| lb = b; |
| return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 : |
| (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0); |
| } |
| |
| /* |
| * Convert a V2 leaf directory to a V2 block directory if possible. |
| */ |
| int /* error */ |
| xfs_dir2_leaf_to_block( |
| xfs_da_args_t *args, /* operation arguments */ |
| struct xfs_buf *lbp, /* leaf buffer */ |
| struct xfs_buf *dbp) /* data buffer */ |
| { |
| __be16 *bestsp; /* leaf bests table */ |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_block_tail_t *btp; /* block tail */ |
| xfs_inode_t *dp; /* incore directory inode */ |
| xfs_dir2_data_unused_t *dup; /* unused data entry */ |
| int error; /* error return value */ |
| int from; /* leaf from index */ |
| xfs_dir2_leaf_t *leaf; /* leaf structure */ |
| xfs_dir2_leaf_entry_t *lep; /* leaf entry */ |
| xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ |
| xfs_mount_t *mp; /* file system mount point */ |
| int needlog; /* need to log data header */ |
| int needscan; /* need to scan for bestfree */ |
| xfs_dir2_sf_hdr_t sfh; /* shortform header */ |
| int size; /* bytes used */ |
| __be16 *tagp; /* end of entry (tag) */ |
| int to; /* block/leaf to index */ |
| xfs_trans_t *tp; /* transaction pointer */ |
| struct xfs_dir2_leaf_entry *ents; |
| struct xfs_dir3_icleaf_hdr leafhdr; |
| |
| trace_xfs_dir2_leaf_to_block(args); |
| |
| dp = args->dp; |
| tp = args->trans; |
| mp = dp->i_mount; |
| leaf = lbp->b_addr; |
| xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf); |
| ents = xfs_dir3_leaf_ents_p(leaf); |
| ltp = xfs_dir2_leaf_tail_p(mp, leaf); |
| |
| ASSERT(leafhdr.magic == XFS_DIR2_LEAF1_MAGIC || |
| leafhdr.magic == XFS_DIR3_LEAF1_MAGIC); |
| /* |
| * If there are data blocks other than the first one, take this |
| * opportunity to remove trailing empty data blocks that may have |
| * been left behind during no-space-reservation operations. |
| * These will show up in the leaf bests table. |
| */ |
| while (dp->i_d.di_size > mp->m_dirblksize) { |
| int hdrsz; |
| |
| hdrsz = xfs_dir3_data_hdr_size(xfs_sb_version_hascrc(&mp->m_sb)); |
| bestsp = xfs_dir2_leaf_bests_p(ltp); |
| if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) == |
| mp->m_dirblksize - hdrsz) { |
| if ((error = |
| xfs_dir2_leaf_trim_data(args, lbp, |
| (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1)))) |
| return error; |
| } else |
| return 0; |
| } |
| /* |
| * Read the data block if we don't already have it, give up if it fails. |
| */ |
| if (!dbp) { |
| error = xfs_dir3_data_read(tp, dp, mp->m_dirdatablk, -1, &dbp); |
| if (error) |
| return error; |
| } |
| hdr = dbp->b_addr; |
| ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
| hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC)); |
| |
| /* |
| * Size of the "leaf" area in the block. |
| */ |
| size = (uint)sizeof(xfs_dir2_block_tail_t) + |
| (uint)sizeof(*lep) * (leafhdr.count - leafhdr.stale); |
| /* |
| * Look at the last data entry. |
| */ |
| tagp = (__be16 *)((char *)hdr + mp->m_dirblksize) - 1; |
| dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); |
| /* |
| * If it's not free or is too short we can't do it. |
| */ |
| if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG || |
| be16_to_cpu(dup->length) < size) |
| return 0; |
| |
| /* |
| * Start converting it to block form. |
| */ |
| xfs_dir3_block_init(mp, tp, dbp, dp); |
| |
| needlog = 1; |
| needscan = 0; |
| /* |
| * Use up the space at the end of the block (blp/btp). |
| */ |
| xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size, |
| &needlog, &needscan); |
| /* |
| * Initialize the block tail. |
| */ |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| btp->count = cpu_to_be32(leafhdr.count - leafhdr.stale); |
| btp->stale = 0; |
| xfs_dir2_block_log_tail(tp, dbp); |
| /* |
| * Initialize the block leaf area. We compact out stale entries. |
| */ |
| lep = xfs_dir2_block_leaf_p(btp); |
| for (from = to = 0; from < leafhdr.count; from++) { |
| if (ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) |
| continue; |
| lep[to++] = ents[from]; |
| } |
| ASSERT(to == be32_to_cpu(btp->count)); |
| xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1); |
| /* |
| * Scan the bestfree if we need it and log the data block header. |
| */ |
| if (needscan) |
| xfs_dir2_data_freescan(mp, hdr, &needlog); |
| if (needlog) |
| xfs_dir2_data_log_header(tp, dbp); |
| /* |
| * Pitch the old leaf block. |
| */ |
| error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp); |
| if (error) |
| return error; |
| |
| /* |
| * Now see if the resulting block can be shrunken to shortform. |
| */ |
| size = xfs_dir2_block_sfsize(dp, hdr, &sfh); |
| if (size > XFS_IFORK_DSIZE(dp)) |
| return 0; |
| |
| return xfs_dir2_block_to_sf(args, dbp, size, &sfh); |
| } |
| |
| /* |
| * Convert the shortform directory to block form. |
| */ |
| int /* error */ |
| xfs_dir2_sf_to_block( |
| xfs_da_args_t *args) /* operation arguments */ |
| { |
| xfs_dir2_db_t blkno; /* dir-relative block # (0) */ |
| xfs_dir2_data_hdr_t *hdr; /* block header */ |
| xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ |
| struct xfs_buf *bp; /* block buffer */ |
| xfs_dir2_block_tail_t *btp; /* block tail pointer */ |
| xfs_dir2_data_entry_t *dep; /* data entry pointer */ |
| xfs_inode_t *dp; /* incore directory inode */ |
| int dummy; /* trash */ |
| xfs_dir2_data_unused_t *dup; /* unused entry pointer */ |
| int endoffset; /* end of data objects */ |
| int error; /* error return value */ |
| int i; /* index */ |
| xfs_mount_t *mp; /* filesystem mount point */ |
| int needlog; /* need to log block header */ |
| int needscan; /* need to scan block freespc */ |
| int newoffset; /* offset from current entry */ |
| int offset; /* target block offset */ |
| xfs_dir2_sf_entry_t *sfep; /* sf entry pointer */ |
| xfs_dir2_sf_hdr_t *oldsfp; /* old shortform header */ |
| xfs_dir2_sf_hdr_t *sfp; /* shortform header */ |
| __be16 *tagp; /* end of data entry */ |
| xfs_trans_t *tp; /* transaction pointer */ |
| struct xfs_name name; |
| |
| trace_xfs_dir2_sf_to_block(args); |
| |
| dp = args->dp; |
| tp = args->trans; |
| mp = dp->i_mount; |
| ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| /* |
| * Bomb out if the shortform directory is way too short. |
| */ |
| if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| return XFS_ERROR(EIO); |
| } |
| |
| oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; |
| |
| ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| ASSERT(dp->i_df.if_u1.if_data != NULL); |
| ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(oldsfp->i8count)); |
| |
| /* |
| * Copy the directory into a temporary buffer. |
| * Then pitch the incore inode data so we can make extents. |
| */ |
| sfp = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP); |
| memcpy(sfp, oldsfp, dp->i_df.if_bytes); |
| |
| xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK); |
| dp->i_d.di_size = 0; |
| xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); |
| |
| /* |
| * Add block 0 to the inode. |
| */ |
| error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno); |
| if (error) { |
| kmem_free(sfp); |
| return error; |
| } |
| /* |
| * Initialize the data block, then convert it to block format. |
| */ |
| error = xfs_dir3_data_init(args, blkno, &bp); |
| if (error) { |
| kmem_free(sfp); |
| return error; |
| } |
| xfs_dir3_block_init(mp, tp, bp, dp); |
| hdr = bp->b_addr; |
| |
| /* |
| * Compute size of block "tail" area. |
| */ |
| i = (uint)sizeof(*btp) + |
| (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t); |
| /* |
| * The whole thing is initialized to free by the init routine. |
| * Say we're using the leaf and tail area. |
| */ |
| dup = xfs_dir3_data_unused_p(hdr); |
| needlog = needscan = 0; |
| xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog, |
| &needscan); |
| ASSERT(needscan == 0); |
| /* |
| * Fill in the tail. |
| */ |
| btp = xfs_dir2_block_tail_p(mp, hdr); |
| btp->count = cpu_to_be32(sfp->count + 2); /* ., .. */ |
| btp->stale = 0; |
| blp = xfs_dir2_block_leaf_p(btp); |
| endoffset = (uint)((char *)blp - (char *)hdr); |
| /* |
| * Remove the freespace, we'll manage it. |
| */ |
| xfs_dir2_data_use_free(tp, bp, dup, |
| (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), |
| be16_to_cpu(dup->length), &needlog, &needscan); |
| /* |
| * Create entry for . |
| */ |
| dep = xfs_dir3_data_dot_entry_p(hdr); |
| dep->inumber = cpu_to_be64(dp->i_ino); |
| dep->namelen = 1; |
| dep->name[0] = '.'; |
| tagp = xfs_dir2_data_entry_tag_p(dep); |
| *tagp = cpu_to_be16((char *)dep - (char *)hdr); |
| xfs_dir2_data_log_entry(tp, bp, dep); |
| blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot); |
| blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp, |
| (char *)dep - (char *)hdr)); |
| /* |
| * Create entry for .. |
| */ |
| dep = xfs_dir3_data_dotdot_entry_p(hdr); |
| dep->inumber = cpu_to_be64(xfs_dir2_sf_get_parent_ino(sfp)); |
| dep->namelen = 2; |
| dep->name[0] = dep->name[1] = '.'; |
| tagp = xfs_dir2_data_entry_tag_p(dep); |
| *tagp = cpu_to_be16((char *)dep - (char *)hdr); |
| xfs_dir2_data_log_entry(tp, bp, dep); |
| blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot); |
| blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp, |
| (char *)dep - (char *)hdr)); |
| offset = xfs_dir3_data_first_offset(hdr); |
| /* |
| * Loop over existing entries, stuff them in. |
| */ |
| i = 0; |
| if (!sfp->count) |
| sfep = NULL; |
| else |
| sfep = xfs_dir2_sf_firstentry(sfp); |
| /* |
| * Need to preserve the existing offset values in the sf directory. |
| * Insert holes (unused entries) where necessary. |
| */ |
| while (offset < endoffset) { |
| /* |
| * sfep is null when we reach the end of the list. |
| */ |
| if (sfep == NULL) |
| newoffset = endoffset; |
| else |
| newoffset = xfs_dir2_sf_get_offset(sfep); |
| /* |
| * There should be a hole here, make one. |
| */ |
| if (offset < newoffset) { |
| dup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); |
| dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
| dup->length = cpu_to_be16(newoffset - offset); |
| *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16( |
| ((char *)dup - (char *)hdr)); |
| xfs_dir2_data_log_unused(tp, bp, dup); |
| xfs_dir2_data_freeinsert(hdr, dup, &dummy); |
| offset += be16_to_cpu(dup->length); |
| continue; |
| } |
| /* |
| * Copy a real entry. |
| */ |
| dep = (xfs_dir2_data_entry_t *)((char *)hdr + newoffset); |
| dep->inumber = cpu_to_be64(xfs_dir2_sfe_get_ino(sfp, sfep)); |
| dep->namelen = sfep->namelen; |
| memcpy(dep->name, sfep->name, dep->namelen); |
| tagp = xfs_dir2_data_entry_tag_p(dep); |
| *tagp = cpu_to_be16((char *)dep - (char *)hdr); |
| xfs_dir2_data_log_entry(tp, bp, dep); |
| name.name = sfep->name; |
| name.len = sfep->namelen; |
| blp[2 + i].hashval = cpu_to_be32(mp->m_dirnameops-> |
| hashname(&name)); |
| blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp, |
| (char *)dep - (char *)hdr)); |
| offset = (int)((char *)(tagp + 1) - (char *)hdr); |
| if (++i == sfp->count) |
| sfep = NULL; |
| else |
| sfep = xfs_dir2_sf_nextentry(sfp, sfep); |
| } |
| /* Done with the temporary buffer */ |
| kmem_free(sfp); |
| /* |
| * Sort the leaf entries by hash value. |
| */ |
| xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort); |
| /* |
| * Log the leaf entry area and tail. |
| * Already logged the header in data_init, ignore needlog. |
| */ |
| ASSERT(needscan == 0); |
| xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1); |
| xfs_dir2_block_log_tail(tp, bp); |
| xfs_dir3_data_check(dp, bp); |
| return 0; |
| } |