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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-06-16 20:00:14 +0200 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-06-20 19:45:22 +0200 |
| commit | acb9553cab552cf17154814f079f54401eefa474 (patch) | |
| tree | 694844661fe98f6b0b7b8b9916c81e018c4819ef /fs/xfs/xfs_dir2_readdir.c | |
| parent | xfs: return the hash value of a leaf1 directory block (diff) | |
| download | linux-acb9553cab552cf17154814f079f54401eefa474.tar.xz linux-acb9553cab552cf17154814f079f54401eefa474.zip | |
xfs: pass along transaction context when reading directory block buffers
Teach the directory reading functions to pass along a transaction context
if one was supplied. The directory scrub code will use transactions to
lock buffers and avoid deadlocking with itself in the case of loops.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/xfs/xfs_dir2_readdir.c')
| -rw-r--r-- | fs/xfs/xfs_dir2_readdir.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/xfs/xfs_dir2_readdir.c b/fs/xfs/xfs_dir2_readdir.c index ede4790753bc..ba2638d37031 100644 --- a/fs/xfs/xfs_dir2_readdir.c +++ b/fs/xfs/xfs_dir2_readdir.c @@ -170,7 +170,7 @@ xfs_dir2_block_getdents( return 0; lock_mode = xfs_ilock_data_map_shared(dp); - error = xfs_dir3_block_read(NULL, dp, &bp); + error = xfs_dir3_block_read(args->trans, dp, &bp); xfs_iunlock(dp, lock_mode); if (error) return error; @@ -228,7 +228,7 @@ xfs_dir2_block_getdents( if (!dir_emit(ctx, (char *)dep->name, dep->namelen, be64_to_cpu(dep->inumber), xfs_dir3_get_dtype(dp->i_mount, filetype))) { - xfs_trans_brelse(NULL, bp); + xfs_trans_brelse(args->trans, bp); return 0; } } @@ -239,7 +239,7 @@ xfs_dir2_block_getdents( */ ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & 0x7fffffff; - xfs_trans_brelse(NULL, bp); + xfs_trans_brelse(args->trans, bp); return 0; } @@ -495,15 +495,21 @@ xfs_dir2_leaf_getdents( else ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; if (bp) - xfs_trans_brelse(NULL, bp); + xfs_trans_brelse(args->trans, bp); return error; } /* * Read a directory. + * + * If supplied, the transaction collects locked dir buffers to avoid + * nested buffer deadlocks. This function does not dirty the + * transaction. The caller should ensure that the inode is locked + * before calling this function. */ int xfs_readdir( + struct xfs_trans *tp, struct xfs_inode *dp, struct dir_context *ctx, size_t bufsize) @@ -522,6 +528,7 @@ xfs_readdir( args.dp = dp; args.geo = dp->i_mount->m_dir_geo; + args.trans = tp; if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_getdents(&args, ctx); |