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authorHugh Dickins <hughd@google.com>2016-07-10 16:46:32 -0700
committerSasha Levin <sasha.levin@oracle.com>2016-07-12 08:48:38 -0400
commit52a8202dd9e756ecb0ff2d5adc870e6a2baf6be4 (patch)
tree3d5b2fe274ade4a43abb35b341f4490662176109
parent6a9f9d4e6c5db89ed8625df1f5f8e60e6a606a2c (diff)
tmpfs: fix regression hang in fallocate undo
[ Upstream commit 7f556567036cb7f89aabe2f0954b08566b4efb53 ] 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> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
-rw-r--r--mm/shmem.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 0087ceace76b..fac22b578eb9 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2140,9 +2140,11 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
NULL);
if (error) {
/* Remove the !PageUptodate pages we added */
- shmem_undo_range(inode,
- (loff_t)start << PAGE_CACHE_SHIFT,
- ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ if (index > start) {
+ shmem_undo_range(inode,
+ (loff_t)start << PAGE_CACHE_SHIFT,
+ ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ }
goto undone;
}