diff options
author | Dave Chinner <dchinner@redhat.com> | 2014-06-25 14:57:53 +1000 |
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committer | Dave Chinner <david@fromorbit.com> | 2014-06-25 14:57:53 +1000 |
commit | 30f712c9dd69348aa51351d5cb6d366bf4fae31d (patch) | |
tree | 9b246ca3986b784d8f9f6841466dfd4c90909e47 /fs/xfs/xfs_dir2_block.c | |
parent | 84be0ffc9043f7c56044294eb775a2200452c76d (diff) | |
download | linux-next-30f712c9dd69348aa51351d5cb6d366bf4fae31d.tar.gz |
libxfs: move source files
Move all the source files that are shared with userspace into
libxfs/. This is done as one big chunk simpy to get it done
quickly
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_dir2_block.c')
-rw-r--r-- | fs/xfs/xfs_dir2_block.c | 1265 |
1 files changed, 0 insertions, 1265 deletions
diff --git a/fs/xfs/xfs_dir2_block.c b/fs/xfs/xfs_dir2_block.c deleted file mode 100644 index ab0bffccf5c3..000000000000 --- a/fs/xfs/xfs_dir2_block.c +++ /dev/null @@ -1,1265 +0,0 @@ -/* - * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. - * Copyright (c) 2013 Red Hat, Inc. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include "xfs.h" -#include "xfs_fs.h" -#include "xfs_format.h" -#include "xfs_log_format.h" -#include "xfs_trans_resv.h" -#include "xfs_sb.h" -#include "xfs_ag.h" -#include "xfs_mount.h" -#include "xfs_da_format.h" -#include "xfs_da_btree.h" -#include "xfs_inode.h" -#include "xfs_trans.h" -#include "xfs_inode_item.h" -#include "xfs_bmap.h" -#include "xfs_buf_item.h" -#include "xfs_dir2.h" -#include "xfs_dir2_priv.h" -#include "xfs_error.h" -#include "xfs_trace.h" -#include "xfs_cksum.h" -#include "xfs_dinode.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_buf_verify_cksum(bp, XFS_DIR3_DATA_CRC_OFF)) - xfs_buf_ioerror(bp, EFSBADCRC); - else if (!xfs_dir3_block_verify(bp)) - xfs_buf_ioerror(bp, EFSCORRUPTED); - - if (bp->b_error) - xfs_verifier_error(bp); -} - -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_buf_ioerror(bp, EFSCORRUPTED); - xfs_verifier_error(bp); - return; - } - - if (!xfs_sb_version_hascrc(&mp->m_sb)) - return; - - if (bip) - hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn); - - xfs_buf_update_cksum(bp, 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, -}; - -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_dir_geo->datablk, -1, bpp, - XFS_DATA_FORK, &xfs_dir3_block_buf_ops); - if (!err && tp) - xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_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_BLFT_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_inode *dp, - 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 = dp->d_ops->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_da_args *args, - 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(args, 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); - 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(args->dp, 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 = dp->d_ops->data_entsize(args->namelen); - - /* - * Set up pointers to parts of the block. - */ - hdr = bp->b_addr; - btp = xfs_dir2_block_tail_p(args->geo, 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(dp, 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 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 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(args, 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(args, 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(dp, 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( - (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(args, 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); - dp->d_ops->data_put_ftype(dep, args->filetype); - tagp = dp->d_ops->data_entry_tag_p(dep); - *tagp = cpu_to_be16((char *)dep - (char *)hdr); - /* - * Clean up the bestfree array and log the header, tail, and entry. - */ - if (needscan) - xfs_dir2_data_freescan(dp, hdr, &needlog); - if (needlog) - xfs_dir2_data_log_header(args, bp); - xfs_dir2_block_log_tail(tp, bp); - xfs_dir2_data_log_entry(args, bp, dep); - xfs_dir3_data_check(dp, 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->m_dir_geo, 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->m_dir_geo, 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(args->geo, 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(args->geo, - be32_to_cpu(blp[ent].address))); - /* - * Fill in inode number, CI name if appropriate, release the block. - */ - args->inumber = be64_to_cpu(dep->inumber); - args->filetype = dp->d_ops->data_get_ftype(dep); - error = xfs_dir_cilookup_result(args, dep->name, dep->namelen); - xfs_trans_brelse(args->trans, bp); - return 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(args->geo, 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 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(args->geo, 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 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(args->geo, 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(args->geo, - be32_to_cpu(blp[ent].address))); - /* - * Mark the data entry's space free. - */ - needlog = needscan = 0; - xfs_dir2_data_make_free(args, bp, - (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr), - dp->d_ops->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(dp, hdr, &needlog); - if (needlog) - xfs_dir2_data_log_header(args, 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(args->geo, 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(args->geo, - 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); - dp->d_ops->data_put_ftype(dep, args->filetype); - xfs_dir2_data_log_entry(args, 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; - dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf); - ents = dp->d_ops->leaf_ents_p(leaf); - ltp = xfs_dir2_leaf_tail_p(args->geo, 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 > args->geo->blksize) { - int hdrsz; - - hdrsz = dp->d_ops->data_entry_offset; - bestsp = xfs_dir2_leaf_bests_p(ltp); - if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) == - args->geo->blksize - 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, args->geo->datablk, -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 + args->geo->blksize) - 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(args, dbp, dup, args->geo->blksize - size, size, - &needlog, &needscan); - /* - * Initialize the block tail. - */ - btp = xfs_dir2_block_tail_p(args->geo, 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(dp, hdr, &needlog); - if (needlog) - xfs_dir2_data_log_header(args, dbp); - /* - * Pitch the old leaf block. - */ - error = xfs_da_shrink_inode(args, args->geo->leafblk, 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; - struct xfs_ifork *ifp; - - trace_xfs_dir2_sf_to_block(args); - - dp = args->dp; - tp = args->trans; - mp = dp->i_mount; - ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK); - ASSERT(ifp->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 EIO; - } - - oldsfp = (xfs_dir2_sf_hdr_t *)ifp->if_u1.if_data; - - ASSERT(ifp->if_bytes == dp->i_d.di_size); - ASSERT(ifp->if_u1.if_data != NULL); - ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(oldsfp->i8count)); - ASSERT(dp->i_d.di_nextents == 0); - - /* - * Copy the directory into a temporary buffer. - * Then pitch the incore inode data so we can make extents. - */ - sfp = kmem_alloc(ifp->if_bytes, KM_SLEEP); - memcpy(sfp, oldsfp, ifp->if_bytes); - - xfs_idata_realloc(dp, -ifp->if_bytes, XFS_DATA_FORK); - xfs_bmap_local_to_extents_empty(dp, XFS_DATA_FORK); - dp->i_d.di_size = 0; - - /* - * 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 = dp->d_ops->data_unused_p(hdr); - needlog = needscan = 0; - xfs_dir2_data_use_free(args, bp, dup, args->geo->blksize - i, - i, &needlog, &needscan); - ASSERT(needscan == 0); - /* - * Fill in the tail. - */ - btp = xfs_dir2_block_tail_p(args->geo, 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(args, bp, dup, - (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), - be16_to_cpu(dup->length), &needlog, &needscan); - /* - * Create entry for . - */ - dep = dp->d_ops->data_dot_entry_p(hdr); - dep->inumber = cpu_to_be64(dp->i_ino); - dep->namelen = 1; - dep->name[0] = '.'; - dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR); - tagp = dp->d_ops->data_entry_tag_p(dep); - *tagp = cpu_to_be16((char *)dep - (char *)hdr); - xfs_dir2_data_log_entry(args, bp, dep); - blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot); - blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr( - (char *)dep - (char *)hdr)); - /* - * Create entry for .. - */ - dep = dp->d_ops->data_dotdot_entry_p(hdr); - dep->inumber = cpu_to_be64(dp->d_ops->sf_get_parent_ino(sfp)); - dep->namelen = 2; - dep->name[0] = dep->name[1] = '.'; - dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR); - tagp = dp->d_ops->data_entry_tag_p(dep); - *tagp = cpu_to_be16((char *)dep - (char *)hdr); - xfs_dir2_data_log_entry(args, bp, dep); - blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot); - blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr( - (char *)dep - (char *)hdr)); - offset = dp->d_ops->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(args, bp, dup); - xfs_dir2_data_freeinsert(hdr, - dp->d_ops->data_bestfree_p(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(dp->d_ops->sf_get_ino(sfp, sfep)); - dep->namelen = sfep->namelen; - dp->d_ops->data_put_ftype(dep, dp->d_ops->sf_get_ftype(sfep)); - memcpy(dep->name, sfep->name, dep->namelen); - tagp = dp->d_ops->data_entry_tag_p(dep); - *tagp = cpu_to_be16((char *)dep - (char *)hdr); - xfs_dir2_data_log_entry(args, 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( - (char *)dep - (char *)hdr)); - offset = (int)((char *)(tagp + 1) - (char *)hdr); - if (++i == sfp->count) - sfep = NULL; - else - sfep = dp->d_ops->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; -} |