This is a note to let you know that I've just added the patch titled
Btrfs: disable xattr operations on subvolume directories
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-disable-xattr-operations-on-subvolume-directories.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1fdf41941b8010691679638f8d0c8d08cfee7726 Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@xxxxxx>
Date: Wed, 25 Jan 2017 17:06:39 -0800
Subject: Btrfs: disable xattr operations on subvolume directories
From: Omar Sandoval <osandov@xxxxxx>
commit 1fdf41941b8010691679638f8d0c8d08cfee7726 upstream.
When you snapshot a subvolume containing a subvolume, you get a
placeholder directory where the subvolume would be. These directory
inodes have ->i_ops set to btrfs_dir_ro_inode_operations. Previously,
these i_ops didn't include the xattr operation callbacks. The conversion
to xattr_handlers missed this case, leading to bogus attempts to set
xattrs on these inodes. This manifested itself as failures when running
delayed inodes.
To fix this, clear IOP_XATTR in ->i_opflags on these inodes.
Fixes: 6c6ef9f26e59 ("xattr: Stop calling {get,set,remove}xattr inode operations")
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Reported-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
Tested-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5679,6 +5679,7 @@ static struct inode *new_simple_dir(stru
inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
inode->i_op = &btrfs_dir_ro_inode_operations;
+ inode->i_opflags &= ~IOP_XATTR;
inode->i_fop = &simple_dir_operations;
inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
inode->i_mtime = current_time(inode);
Patches currently in stable-queue which might be from osandov@xxxxxx are
queue-4.9/btrfs-remove-get-set-_acl-from-btrfs_dir_ro_inode_operations.patch
queue-4.9/btrfs-disable-xattr-operations-on-subvolume-directories.patch
queue-4.9/btrfs-remove-old-tree_root-case-in-btrfs_read_locked_inode.patch
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