tree cebecf399c2d9ef5b0a24902638cb37d2e9e092b
parent ed3654eb981fd44694b4d2a636e13f998bc10e7f
author Theodore Ts'o <tytso@mit.edu> 1395686592 -0400
committer Theodore Ts'o <tytso@mit.edu> 1395686592 -0400

ext4: atomically set inode->i_flags in ext4_set_inode_flags()

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.

Reported-by: John Sullivan <jsrhbz@kanargh.force9.co.uk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org