(2014/07/02 8:56), David Sterba wrote:
On Wed, Jun 25, 2014 at 10:36:02PM +0100, Filipe David Borba Manana wrote:
This change is based on the corresponding recent change for ext4:
ext4: atomically set inode->i_flags in ext4_set_inode_flags()
That has the following commit message that applies to btrfs as well:
"Use cmpxchg() to atomically set i_flags instead of clearing out the
S_IMMUTABLE, S_APPEND, etc. flags and then setting them from the
EXT4_IMMUTABLE_FL, EXT4_APPEND_FL flags, since this opens up a race
where an immutable file has the immutable flag cleared for a brief
window of time."
Replacing EXT4_IMMUTABLE_FL and EXT4_APPEND_FL with BTRFS_INODE_IMMUTABLE
and BTRFS_INODE_APPEND, respectively.
Signed-off-by: Filipe David Borba Manana <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Reviewed-by: Satoru Takeuchi <[email protected]>
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