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Btrfs: Fix page leak in compressed writeback path

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"start + num_bytes >= actual_end" can happen when compressed page writeback races
with file truncation. In that case we need unlock and release pages past the end
of file.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng 2010-12-06 07:02:36 +00:00 committed by Chris Mason
parent 84cd948cb1
commit 24ae63656a
1 changed files with 1 additions and 1 deletions
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fs/btrfs/inode.c
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@ -495,7 +495,7 @@ static noinline int compress_file_range(struct inode *inode,
add_async_extent(async_cow, start, num_bytes, add_async_extent(async_cow, start, num_bytes,
total_compressed, pages, nr_pages_ret); total_compressed, pages, nr_pages_ret);
if (start + num_bytes < end && start + num_bytes < actual_end) { if (start + num_bytes < end) {
start += num_bytes; start += num_bytes;
pages = NULL; pages = NULL;
cond_resched(); cond_resched();