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authorChris Mason <chris.mason@oracle.com>2009-04-24 14:39:24 -0400
committerChris Mason <chris.mason@oracle.com>2009-04-24 15:46:05 -0400
commite980b50cda1610f1c17978d9b7fd311a9dd93877 (patch)
treea5ab72fa4b791758e25fd6ece6f1aedd29954e7b /fs/btrfs/ioctl.c
parent9601e3f6336f6ca66929f451b1f66085e68e36e3 (diff)
downloadop-kernel-dev-e980b50cda1610f1c17978d9b7fd311a9dd93877.zip
op-kernel-dev-e980b50cda1610f1c17978d9b7fd311a9dd93877.tar.gz
Btrfs: fix fallocate deadlock on inode extent lock
The btrfs fallocate call takes an extent lock on the entire range being fallocated, and then runs through insert_reserved_extent on each extent as they are allocated. The problem with this is that btrfs_drop_extents may decide to try and take the same extent lock fallocate was already holding. The solution used here is to push down knowledge of the range that is already locked going into btrfs_drop_extents. It turns out that at least one other caller had the same bug. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r--fs/btrfs/ioctl.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7594bec..f4e5d2e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -830,7 +830,8 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
BUG_ON(!trans);
/* punch hole in destination first */
- btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte);
+ btrfs_drop_extents(trans, root, inode, off, off + len,
+ off + len, 0, &hint_byte);
/* clone data */
key.objectid = src->i_ino;
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