https://github.com/torvalds/linux
Revision 7f556567036cb7f89aabe2f0954b08566b4efb53 authored by Hugh Dickins on 10 July 2016, 23:46:32 UTC, committed by Linus Torvalds on 11 July 2016, 03:08:44 UTC
The well-spotted fallocate undo fix is good in most cases, but not when
fallocate failed on the very first page. index 0 then passes lend -1
to shmem_undo_range(), and that has two bad effects: (a) that it will
undo every fallocation throughout the file, unrestricted by the current
range; but more importantly (b) it can cause the undo to hang, because
lend -1 is treated as truncation, which makes it keep on retrying until
every page has gone, but those already fully instantiated will never go
away. Big thank you to xfstests generic/269 which demonstrates this.
Fixes: b9b4bb26af01 ("tmpfs: don't undo fallocate past its last page")
Cc: stable@vger.kernel.org
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 617a8d6
Tip revision: 7f556567036cb7f89aabe2f0954b08566b4efb53 authored by Hugh Dickins on 10 July 2016, 23:46:32 UTC
tmpfs: fix regression hang in fallocate undo
tmpfs: fix regression hang in fallocate undo
Tip revision: 7f55656
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| Kconfig | -rw-r--r-- | 3.3 KB |
| Makefile | -rw-r--r-- | 4.9 KB |
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