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xfs: limit specualtive delalloc to maxioffset 

Speculative delayed allocation beyond EOF near the maximum supported
file offset can result in creating delalloc extents beyond
mp->m_maxioffset (8EB). These can never be trimmed during
xfs_free_eof_blocks() because they are beyond mp->m_maxioffset, and
that results in assert failures in xfs_fs_destroy_inode() due to
delalloc blocks still being present. xfstests 071 exposes this
problem.

Limit speculative delalloc to mp->m_maxioffset to avoid this
problem.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-04-29 22:43:19 +10:00 committed by Ben Myers
parent 58e2077064
commit 3ed9116e8a
1 changed files with 9 additions and 0 deletions
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9
fs/xfs/xfs_iomap.c
View File

@ -415,6 +415,15 @@ retry:
return error;
}
/*
* Make sure preallocation does not create extents beyond the range we
* actually support in this filesystem.
*/
if (last_fsb > XFS_B_TO_FSB(mp, mp->m_maxioffset))
last_fsb = XFS_B_TO_FSB(mp, mp->m_maxioffset);
ASSERT(last_fsb > offset_fsb);
nimaps = XFS_WRITE_IMAPS;
error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
imap, &nimaps, XFS_BMAPI_ENTIRE);