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From: Greg KH on 11 Aug 2010 20:10
2.6.32-stable review patch. If anyone has any objections, please let us know.

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

From: Aneesh Kumar K.V <aneesh.kumar(a)linux.vnet.ibm.com>

commit 23b5c50945f2294add0137799400329c0ebba290 upstream.

This version of the i_size fix for fallocate makes sure we only update
the i_size when the current fallocate is really operating outside of
i_size.

Signed-off-by: Chris Mason <chris.mason(a)oracle.com>
Acked-by: Jeff Mahoney <jeffm(a)suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
fs/btrfs/inode.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5798,7 +5798,9 @@ static int prealloc_file_range(struct in
inode->i_ctime = CURRENT_TIME;
BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
- cur_offset > inode->i_size) {
+ (actual_len > inode->i_size) &&
+ (cur_offset > inode->i_size)) {
+
if (cur_offset > actual_len)
i_size = actual_len;
else


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