diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/xfs/xfs_dir2_block.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/xfs/xfs_dir2_block.c | 1223 |
1 files changed, 1223 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/xfs/xfs_dir2_block.c b/ANDROID_3.4.5/fs/xfs/xfs_dir2_block.c new file mode 100644 index 00000000..d3b63aef --- /dev/null +++ b/ANDROID_3.4.5/fs/xfs/xfs_dir2_block.c @@ -0,0 +1,1223 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_types.h" +#include "xfs_log.h" +#include "xfs_inum.h" +#include "xfs_trans.h" +#include "xfs_sb.h" +#include "xfs_ag.h" +#include "xfs_mount.h" +#include "xfs_da_btree.h" +#include "xfs_bmap_btree.h" +#include "xfs_dinode.h" +#include "xfs_inode.h" +#include "xfs_inode_item.h" +#include "xfs_dir2.h" +#include "xfs_dir2_format.h" +#include "xfs_dir2_priv.h" +#include "xfs_error.h" +#include "xfs_trace.h" + +/* + * Local function prototypes. + */ +static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first, + int last); +static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp); +static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **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); +} + +/* + * Add an entry to a block directory. + */ +int /* error */ +xfs_dir2_block_addname( + xfs_da_args_t *args) /* directory op arguments */ +{ + xfs_dir2_data_free_t *bf; /* bestfree table in block */ + xfs_dir2_data_hdr_t *hdr; /* block header */ + xfs_dir2_leaf_entry_t *blp; /* block leaf entries */ + xfs_dabuf_t *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 dabuf bp. + */ + if ((error = + xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) { + return error; + } + ASSERT(bp != NULL); + hdr = bp->data; + /* + * Check the magic number, corrupted if wrong. + */ + if (unlikely(hdr->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))) { + XFS_CORRUPTION_ERROR("xfs_dir2_block_addname", + XFS_ERRLEVEL_LOW, mp, hdr); + xfs_da_brelse(tp, bp); + return XFS_ERROR(EFSCORRUPTED); + } + len = xfs_dir2_data_entsize(args->namelen); + /* + * Set up pointers to parts of the block. + */ + bf = hdr->bestfree; + btp = xfs_dir2_block_tail_p(mp, hdr); + blp = xfs_dir2_block_leaf_p(btp); + /* + * No stale entries? Need space for entry and new leaf. + */ + if (!btp->stale) { + /* + * 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) + dup = enddup = NULL; + /* + * Check out the biggest freespace and see if it's the same one. + */ + else { + dup = (xfs_dir2_data_unused_t *) + ((char *)hdr + be16_to_cpu(bf[0].offset)); + if (dup == enddup) { + /* + * It is the biggest freespace, is it too small + * to hold the new leaf too? + */ + if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) { + /* + * Yes, we 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; + } + } else { + /* + * Not the same free entry, + * just check its length. + */ + if (be16_to_cpu(dup->length) < len) { + dup = NULL; + } + } + } + compact = 0; + } + /* + * If there are stale entries we'll use one for the leaf. + * Is the biggest entry enough to avoid compaction? + */ + else if (be16_to_cpu(bf[0].length) >= len) { + dup = (xfs_dir2_data_unused_t *) + ((char *)hdr + be16_to_cpu(bf[0].offset)); + compact = 0; + } + /* + * Will need to compact to make this work. + */ + else { + /* + * Tag just before the first leaf entry. + */ + 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; + compact = 1; + } + /* + * If this isn't a real add, we're done with the buffer. + */ + if (args->op_flags & XFS_DA_OP_JUSTCHECK) + xfs_da_brelse(tp, bp); + /* + * If we don't have space for the new entry & leaf ... + */ + if (!dup) { + /* + * Not trying to actually do anything, or don't have + * a space reservation: return no-space. + */ + if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || 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); + xfs_da_buf_done(bp); + if (error) + return error; + return xfs_dir2_leaf_addname(args); + } + /* + * Just checking, and it would work, so say so. + */ + if (args->op_flags & XFS_DA_OP_JUSTCHECK) + return 0; + needlog = needscan = 0; + /* + * If need to compact the leaf entries, do it now. + * Leave the highest-numbered stale entry stale. + * XXX should be the one closest to mid but mid is not yet computed. + */ + if (compact) { + int fromidx; /* source leaf index */ + int toidx; /* target leaf index */ + + for (fromidx = toidx = be32_to_cpu(btp->count) - 1, + highstale = lfloghigh = -1; + 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(mp, hdr, &needlog); + needscan = 0; + } + } + /* + * Set leaf logging boundaries to impossible state. + * For the no-stale case they're set explicitly. + */ + else if (btp->stale) { + 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_dir2_data_check(dp, bp); + xfs_da_buf_done(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 */ + xfs_dabuf_t *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; + } + /* + * Can't read the block, give up, else get dabuf in bp. + */ + error = xfs_da_read_buf(NULL, dp, mp->m_dirdatablk, -1, + &bp, XFS_DATA_FORK); + if (error) + return error; + + ASSERT(bp != NULL); + /* + * 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->data; + xfs_dir2_data_check(dp, bp); + /* + * Set up values for the loop. + */ + btp = xfs_dir2_block_tail_p(mp, hdr); + ptr = (char *)(hdr + 1); + 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_da_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_da_brelse(NULL, bp); + return 0; +} + +/* + * Log leaf entries from the block. + */ +static void +xfs_dir2_block_log_leaf( + xfs_trans_t *tp, /* transaction structure */ + xfs_dabuf_t *bp, /* block buffer */ + int first, /* index of first logged leaf */ + int last) /* index of last logged leaf */ +{ + xfs_dir2_data_hdr_t *hdr = bp->data; + 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_da_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 */ + xfs_dabuf_t *bp) /* block buffer */ +{ + xfs_dir2_data_hdr_t *hdr = bp->data; + xfs_dir2_block_tail_t *btp; + + btp = xfs_dir2_block_tail_p(tp->t_mountp, hdr); + xfs_da_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 */ + xfs_dabuf_t *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->data; + xfs_dir2_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_da_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 */ + xfs_dabuf_t **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 */ + xfs_dabuf_t *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; + /* + * Read the buffer, return error if we can't get it. + */ + if ((error = + xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) { + return error; + } + ASSERT(bp != NULL); + hdr = bp->data; + xfs_dir2_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_da_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_da_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 */ + xfs_dabuf_t *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->data; + 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_dir2_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)) { + xfs_da_buf_done(bp); + 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 */ + xfs_dabuf_t *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->data; + 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_dir2_data_check(dp, bp); + xfs_da_buf_done(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 */ + xfs_dabuf_t *lbp, /* leaf buffer */ + xfs_dabuf_t *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 */ + + trace_xfs_dir2_leaf_to_block(args); + + dp = args->dp; + tp = args->trans; + mp = dp->i_mount; + leaf = lbp->data; + ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC)); + ltp = xfs_dir2_leaf_tail_p(mp, leaf); + /* + * 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) { + bestsp = xfs_dir2_leaf_bests_p(ltp); + if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) == + mp->m_dirblksize - (uint)sizeof(*hdr)) { + if ((error = + xfs_dir2_leaf_trim_data(args, lbp, + (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1)))) + goto out; + } else { + error = 0; + goto out; + } + } + /* + * Read the data block if we don't already have it, give up if it fails. + */ + if (dbp == NULL && + (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp, + XFS_DATA_FORK))) { + goto out; + } + hdr = dbp->data; + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)); + /* + * Size of the "leaf" area in the block. + */ + size = (uint)sizeof(xfs_dir2_block_tail_t) + + (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.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) { + error = 0; + goto out; + } + /* + * Start converting it to block form. + */ + hdr->magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC); + 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(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.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 < be16_to_cpu(leaf->hdr.count); from++) { + if (leaf->ents[from].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) + continue; + lep[to++] = leaf->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); + lbp = NULL; + if (error) { + goto out; + } + /* + * 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)) { + error = 0; + goto out; + } + return xfs_dir2_block_to_sf(args, dbp, size, &sfh); +out: + if (lbp) + xfs_da_buf_done(lbp); + if (dbp) + xfs_da_buf_done(dbp); + return error; +} + +/* + * 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 */ + xfs_dabuf_t *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. + */ + error = xfs_dir2_data_init(args, blkno, &bp); + if (error) { + kmem_free(sfp); + return error; + } + hdr = bp->data; + hdr->magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC); + /* + * 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_dir2_data_unused_t *)(hdr + 1); + 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_dir2_data_entry_t *) + ((char *)hdr + XFS_DIR2_DATA_DOT_OFFSET); + 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_dir2_data_entry_t *) + ((char *)hdr + XFS_DIR2_DATA_DOTDOT_OFFSET); + 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_DIR2_DATA_FIRST_OFFSET; + /* + * 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_dir2_data_check(dp, bp); + xfs_da_buf_done(bp); + return 0; +} |