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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_alloc.h | |
| parent | 07c72e556299a7fea448912b1330b9ebfd418662 (diff) | |
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_alloc.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_alloc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h index 6c22b12176b8..a4427c5775c2 100644 --- a/fs/xfs/libxfs/xfs_alloc.h +++ b/fs/xfs/libxfs/xfs_alloc.h @@ -75,6 +75,9 @@ typedef struct xfs_alloc_arg { char wasfromfl; /* set if allocation is from freelist */ struct xfs_owner_info oinfo; /* owner of blocks being allocated */ enum xfs_ag_resv_type resv; /* block reservation to use */ +#ifdef DEBUG + bool alloc_minlen_only; /* allocate exact minlen extent */ +#endif } xfs_alloc_arg_t; /* |