linux-kernel - [053/111] Btrfs: Fix btrfs_drop_extent

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Message-Id: <20100811235500.394609171@clark.site>
Date:	Wed, 11 Aug 2010 16:54:34 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Yan Zheng <zheng.yan@...cle.com>,
	Chris Mason <chris.mason@...cle.com>,
	Jeff Mahoney <jeffm@...e.com>
Subject: [053/111] Btrfs: Fix btrfs_drop_extent_cache for skip pinned case

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Yan, Zheng <zheng.yan@...cle.com>

commit 55ef68990029fcd8d04d42fc184aa7fb18cf309e upstream.

The check for skip pinned case is wrong, it may breaks the
while loop too soon.

Signed-off-by: Yan Zheng <zheng.yan@...cle.com>
Signed-off-by: Chris Mason <chris.mason@...cle.com>
Acked-by: Jeff Mahoney <jeffm@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/btrfs/file.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -179,18 +179,14 @@ int btrfs_drop_extent_cache(struct inode
 		}
 		flags = em->flags;
 		if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
-			if (em->start <= start &&
-			    (!testend || em->start + em->len >= start + len)) {
+			if (testend && em->start + em->len >= start + len) {
 				free_extent_map(em);
 				write_unlock(&em_tree->lock);
 				break;
 			}
-			if (start < em->start) {
-				len = em->start - start;
-			} else {
+			start = em->start + em->len;
+			if (testend)
 				len = start + len - (em->start + em->len);
-				start = em->start + em->len;
-			}
 			free_extent_map(em);
 			write_unlock(&em_tree->lock);
 			continue;


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