From: Josef Bacik <jbacik@fb.com>
Date: Fri, 25 Mar 2016 14:02:41 +0000 (-0400)
Subject: Btrfs: don't use src fd for printk
X-Git-Tag: firefly_0821_release~176^2~4^2~43^2~86
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e1ce8c2a299d41c4c96be785c50427635e0a9c7f;p=firefly-linux-kernel-4.4.55.git

Btrfs: don't use src fd for printk

commit c79b4713304f812d3d6c95826fc3e5fc2c0b0c14 upstream.

The fd we pass in may not be on a btrfs file system, so don't try to do
BTRFS_I() on it.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f07d01bc4875..bfcd87ee8ff5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1648,7 +1648,7 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
 
 		src_inode = file_inode(src.file);
 		if (src_inode->i_sb != file_inode(file)->i_sb) {
-			btrfs_info(BTRFS_I(src_inode)->root->fs_info,
+			btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
 				   "Snapshot src from another FS");
 			ret = -EXDEV;
 		} else if (!inode_owner_or_capable(src_inode)) {