Yan, Zheng
2010-Dec-06 07:02 UTC
[PATCH] Btrfs: Fix page leak in compressed writeback path
"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>
---
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8039390..2ea98d8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -495,7 +495,7 @@ again:
add_async_extent(async_cow, start, num_bytes,
total_compressed, pages, nr_pages_ret);
- if (start + num_bytes < end && start + num_bytes < actual_end)
{
+ if (start + num_bytes < end) {
start += num_bytes;
pages = NULL;
cond_resched();
--
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