diff options
author | Dave Chinner <dchinner@redhat.com> | 2012-11-12 22:54:13 +1100 |
---|---|---|
committer | Ben Myers <bpm@sgi.com> | 2012-11-15 21:34:43 -0600 |
commit | 2025207ca6738a1217126ef14af9d104433f9824 (patch) | |
tree | 522cac64d22f59063e16e7e2aec5a1688fa77a6b /fs/xfs/xfs_dir2_node.c | |
parent | 82025d7f79148fe66a1594a0ebe4ab38152cf9e6 (diff) | |
download | linux-2025207ca6738a1217126ef14af9d104433f9824.tar.bz2 |
xfs: factor dir2 free block reading
Also factor out the updating of the free block when removing entries
from leaf blocks, and add a verifier callback for reads.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_dir2_node.c')
-rw-r--r-- | fs/xfs/xfs_dir2_node.c | 218 |
1 files changed, 140 insertions, 78 deletions
diff --git a/fs/xfs/xfs_dir2_node.c b/fs/xfs/xfs_dir2_node.c index 290c2b1016ab..d7f899dfbff5 100644 --- a/fs/xfs/xfs_dir2_node.c +++ b/fs/xfs/xfs_dir2_node.c @@ -55,6 +55,57 @@ static int xfs_dir2_leafn_remove(xfs_da_args_t *args, struct xfs_buf *bp, static int xfs_dir2_node_addname_int(xfs_da_args_t *args, xfs_da_state_blk_t *fblk); +static void +xfs_dir2_free_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_dir2_free_hdr *hdr = bp->b_addr; + int block_ok = 0; + + block_ok = hdr->magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC); + if (!block_ok) { + XFS_CORRUPTION_ERROR("xfs_dir2_free_verify magic", + XFS_ERRLEVEL_LOW, mp, hdr); + xfs_buf_ioerror(bp, EFSCORRUPTED); + } + + bp->b_iodone = NULL; + xfs_buf_ioend(bp, 0); +} + +static int +__xfs_dir2_free_read( + struct xfs_trans *tp, + struct xfs_inode *dp, + xfs_dablk_t fbno, + xfs_daddr_t mappedbno, + struct xfs_buf **bpp) +{ + return xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp, + XFS_DATA_FORK, xfs_dir2_free_verify); +} + +int +xfs_dir2_free_read( + struct xfs_trans *tp, + struct xfs_inode *dp, + xfs_dablk_t fbno, + struct xfs_buf **bpp) +{ + return __xfs_dir2_free_read(tp, dp, fbno, -1, bpp); +} + +static int +xfs_dir2_free_try_read( + struct xfs_trans *tp, + struct xfs_inode *dp, + xfs_dablk_t fbno, + struct xfs_buf **bpp) +{ + return __xfs_dir2_free_read(tp, dp, fbno, -2, bpp); +} + /* * Log entries from a freespace block. */ @@ -394,12 +445,10 @@ xfs_dir2_leafn_lookup_for_addname( */ if (curbp) xfs_trans_brelse(tp, curbp); - /* - * Read the free block. - */ - error = xfs_da_read_buf(tp, dp, + + error = xfs_dir2_free_read(tp, dp, xfs_dir2_db_to_da(mp, newfdb), - -1, &curbp, XFS_DATA_FORK, NULL); + &curbp); if (error) return error; free = curbp->b_addr; @@ -825,6 +874,77 @@ xfs_dir2_leafn_rebalance( } } +static int +xfs_dir2_data_block_free( + xfs_da_args_t *args, + struct xfs_dir2_data_hdr *hdr, + struct xfs_dir2_free *free, + xfs_dir2_db_t fdb, + int findex, + struct xfs_buf *fbp, + int longest) +{ + struct xfs_trans *tp = args->trans; + int logfree = 0; + + if (!hdr) { + /* One less used entry in the free table. */ + be32_add_cpu(&free->hdr.nused, -1); + xfs_dir2_free_log_header(tp, fbp); + + /* + * If this was the last entry in the table, we can trim the + * table size back. There might be other entries at the end + * referring to non-existent data blocks, get those too. + */ + if (findex == be32_to_cpu(free->hdr.nvalid) - 1) { + int i; /* free entry index */ + + for (i = findex - 1; i >= 0; i--) { + if (free->bests[i] != cpu_to_be16(NULLDATAOFF)) + break; + } + free->hdr.nvalid = cpu_to_be32(i + 1); + logfree = 0; + } else { + /* Not the last entry, just punch it out. */ + free->bests[findex] = cpu_to_be16(NULLDATAOFF); + logfree = 1; + } + /* + * If there are no useful entries left in the block, + * get rid of the block if we can. + */ + if (!free->hdr.nused) { + int error; + + error = xfs_dir2_shrink_inode(args, fdb, fbp); + if (error == 0) { + fbp = NULL; + logfree = 0; + } else if (error != ENOSPC || args->total != 0) + return error; + /* + * It's possible to get ENOSPC if there is no + * space reservation. In this case some one + * else will eventually get rid of this block. + */ + } + } else { + /* + * Data block is not empty, just set the free entry to the new + * value. + */ + free->bests[findex] = cpu_to_be16(longest); + logfree = 1; + } + + /* Log the free entry that changed, unless we got rid of it. */ + if (logfree) + xfs_dir2_free_log_bests(tp, fbp, findex, findex); + return 0; +} + /* * Remove an entry from a node directory. * This removes the leaf entry and the data entry, @@ -908,15 +1028,14 @@ xfs_dir2_leafn_remove( xfs_dir2_db_t fdb; /* freeblock block number */ int findex; /* index in freeblock entries */ xfs_dir2_free_t *free; /* freeblock structure */ - int logfree; /* need to log free entry */ /* * Convert the data block number to a free block, * read in the free block. */ fdb = xfs_dir2_db_to_fdb(mp, db); - error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), - -1, &fbp, XFS_DATA_FORK, NULL); + error = xfs_dir2_free_read(tp, dp, xfs_dir2_db_to_da(mp, fdb), + &fbp); if (error) return error; free = fbp->b_addr; @@ -954,68 +1073,12 @@ xfs_dir2_leafn_remove( * If we got rid of the data block, we can eliminate that entry * in the free block. */ - if (hdr == NULL) { - /* - * One less used entry in the free table. - */ - be32_add_cpu(&free->hdr.nused, -1); - xfs_dir2_free_log_header(tp, fbp); - /* - * If this was the last entry in the table, we can - * trim the table size back. There might be other - * entries at the end referring to non-existent - * data blocks, get those too. - */ - if (findex == be32_to_cpu(free->hdr.nvalid) - 1) { - int i; /* free entry index */ - - for (i = findex - 1; - i >= 0 && - free->bests[i] == cpu_to_be16(NULLDATAOFF); - i--) - continue; - free->hdr.nvalid = cpu_to_be32(i + 1); - logfree = 0; - } - /* - * Not the last entry, just punch it out. - */ - else { - free->bests[findex] = cpu_to_be16(NULLDATAOFF); - logfree = 1; - } - /* - * If there are no useful entries left in the block, - * get rid of the block if we can. - */ - if (!free->hdr.nused) { - error = xfs_dir2_shrink_inode(args, fdb, fbp); - if (error == 0) { - fbp = NULL; - logfree = 0; - } else if (error != ENOSPC || args->total != 0) - return error; - /* - * It's possible to get ENOSPC if there is no - * space reservation. In this case some one - * else will eventually get rid of this block. - */ - } - } - /* - * Data block is not empty, just set the free entry to - * the new value. - */ - else { - free->bests[findex] = cpu_to_be16(longest); - logfree = 1; - } - /* - * Log the free entry that changed, unless we got rid of it. - */ - if (logfree) - xfs_dir2_free_log_bests(tp, fbp, findex, findex); + error = xfs_dir2_data_block_free(args, hdr, free, + fdb, findex, fbp, longest); + if (error) + return error; } + xfs_dir2_leafn_check(dp, bp); /* * Return indication of whether this leaf block is empty enough @@ -1453,9 +1516,9 @@ xfs_dir2_node_addname_int( * This should be really rare, so there's no reason * to avoid it. */ - error = xfs_da_read_buf(tp, dp, - xfs_dir2_db_to_da(mp, fbno), -2, - &fbp, XFS_DATA_FORK, NULL); + error = xfs_dir2_free_try_read(tp, dp, + xfs_dir2_db_to_da(mp, fbno), + &fbp); if (error) return error; if (!fbp) @@ -1518,8 +1581,9 @@ xfs_dir2_node_addname_int( * that was just allocated. */ fbno = xfs_dir2_db_to_fdb(mp, dbno); - error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, fbno), -2, - &fbp, XFS_DATA_FORK, NULL); + error = xfs_dir2_free_try_read(tp, dp, + xfs_dir2_db_to_da(mp, fbno), + &fbp); if (error) return error; @@ -1915,17 +1979,15 @@ xfs_dir2_node_trim_free( /* * Read the freespace block. */ - error = xfs_da_read_buf(tp, dp, (xfs_dablk_t)fo, -2, &bp, - XFS_DATA_FORK, NULL); + error = xfs_dir2_free_try_read(tp, dp, fo, &bp); if (error) return error; /* * There can be holes in freespace. If fo is a hole, there's * nothing to do. */ - if (bp == NULL) { + if (!bp) return 0; - } free = bp->b_addr; ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); /* |