* [PATCH] Btrfs: Fix page leak in compressed writeback path
@ 2010-12-06 7:02 Yan, Zheng
0 siblings, 0 replies; only message in thread
From: Yan, Zheng @ 2010-12-06 7:02 UTC (permalink / raw)
To: linux-btrfs
"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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2010-12-06 7:02 [PATCH] Btrfs: Fix page leak in compressed writeback path Yan, Zheng
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