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| author |   Chandan Babu R <chandanrlinux@gmail.com> | 2021-01-22 16:48:17 -0800 |
|---|---|---|
| committer |   Darrick J. Wong <djwong@kernel.org> | 2021-01-22 16:54:49 -0800 |
| commit | 301519674699aa9b80a15b2b2165e08532b176e6 (patch) | |
| tree | 4b14f1d3aec7a061499dff2345e1340fc301d3b4 /fs/xfs/libxfs/xfs_errortag.h | |
| parent | xfs: Process allocated extent in a separate function (diff) | |
| download | linux-dev-301519674699aa9b80a15b2b2165e08532b176e6.tar.xz linux-dev-301519674699aa9b80a15b2b2165e08532b176e6.zip | |
xfs: Introduce error injection to allocate only minlen size extents for files
This commit adds XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT error tag which
helps userspace test programs to get xfs_bmap_btalloc() to always
allocate minlen sized extents.
This is required for test programs which need a guarantee that minlen
extents allocated for a file do not get merged with their existing
neighbours in the inode's BMBT. "Inode fork extent overflow check" for
Directories, Xattrs and extension of realtime inodes need this since the
file offset at which the extents are being allocated cannot be
explicitly controlled from userspace.
One way to use this error tag is to,
1. Consume all of the free space by sequentially writing to a file.
2. Punch alternate blocks of the file. This causes CNTBT to contain
sufficient number of one block sized extent records.
3. Inject XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT error tag.
After step 3, xfs_bmap_btalloc() will issue space allocation
requests for minlen sized extents only.
ENOSPC error code is returned to userspace when there aren't any "one
block sized" extents left in any of the AGs.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_errortag.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_errortag.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h index 1c56fcceeea6..6ca9084b6934 100644 --- a/fs/xfs/libxfs/xfs_errortag.h +++ b/fs/xfs/libxfs/xfs_errortag.h @@ -57,7 +57,8 @@ #define XFS_ERRTAG_IUNLINK_FALLBACK 34 #define XFS_ERRTAG_BUF_IOERROR 35 #define XFS_ERRTAG_REDUCE_MAX_IEXTENTS 36 -#define XFS_ERRTAG_MAX 37 +#define XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT 37 +#define XFS_ERRTAG_MAX 38 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -99,5 +100,6 @@ #define XFS_RANDOM_IUNLINK_FALLBACK (XFS_RANDOM_DEFAULT/10) #define XFS_RANDOM_BUF_IOERROR XFS_RANDOM_DEFAULT #define XFS_RANDOM_REDUCE_MAX_IEXTENTS 1 +#define XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT 1 #endif /* __XFS_ERRORTAG_H_ */ |