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| author | Dave Chinner <dchinner@redhat.com> | 2011-01-27 12:17:58 +1100 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2011-01-28 09:05:36 -0600 |
| commit | 4ce159890c00e2cc705e955a939bf1dca7b07ab8 (patch) | |
| tree | 8b6351a4d577232c6c3e71c11c6533ce7ff0aa78 /fs/xfs | |
| parent | 14b064ceaa6f51a7426cc45b4b43685b94380658 (diff) | |
| download | lwn-4ce159890c00e2cc705e955a939bf1dca7b07ab8.tar.gz lwn-4ce159890c00e2cc705e955a939bf1dca7b07ab8.zip | |
xfs: prevent extsize alignment from exceeding maximum extent size
When doing delayed allocation, if the allocation size is for a
maximally sized extent, extent size alignment can push it over this
limit. This results in an assert failure in xfs_bmbt_set_allf() as
the extent length is too large to find in the extent record.
Fix this by ensuring that we allow for space that extent size
alignment requires (up to 2 * (extsize -1) blocks as we have to
handle both head and tail alignment) when limiting the maximum size
of the extent.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/xfs_bmap.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c index f3a3768189bb..3e9c278a8f78 100644 --- a/fs/xfs/xfs_bmap.c +++ b/fs/xfs/xfs_bmap.c @@ -4487,6 +4487,16 @@ xfs_bmapi( /* Figure out the extent size, adjust alen */ extsz = xfs_get_extsz_hint(ip); if (extsz) { + /* + * make sure we don't exceed a single + * extent length when we align the + * extent by reducing length we are + * going to allocate by the maximum + * amount extent size aligment may + * require. + */ + alen = XFS_FILBLKS_MIN(len, + MAXEXTLEN - (2 * extsz - 1)); error = xfs_bmap_extsize_align(mp, &got, &prev, extsz, rt, eof, |