[XFS] Fix transaction overrun during writeback.

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Prevent transaction overrun in xfs_iomap_write_allocate() if we race with
a truncate that overlaps the delalloc range we were planning to allocate.

If we race, we may allocate into a hole and that requires block
allocation. At this point in time we don't have a reservation for block
allocation (apart from metadata blocks) and so allocating into a hole
rather than a delalloc region results in overflowing the transaction block
reservation.

Fix it by only allowing a single extent to be allocated at a time.

SGI-PV: 972757
SGI-Modid: xfs-linux-melb:xfs-kern:30005a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

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This commit is contained in:

David Chinner 2007-11-23 16:29:11 +11:00 • committed by Lachlan McIlroy

parent 786f486f81

commit e4143a1cf5

1 changed files with 50 additions and 25 deletions

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fs/xfs/xfs_iomap.c

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