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| author | Theodore Ts'o <tytso@mit.edu> | 2014-03-24 14:43:12 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-03-24 14:43:12 -0400 |
| commit | 5f16f3225b06242a9ee876f07c1c9b6ed36a22b6 (patch) | |
| tree | cebecf399c2d9ef5b0a24902638cb37d2e9e092b /include/linux/fs.h | |
| parent | ed3654eb981fd44694b4d2a636e13f998bc10e7f (diff) | |
| download | linux-5f16f3225b06242a9ee876f07c1c9b6ed36a22b6.tar.gz linux-5f16f3225b06242a9ee876f07c1c9b6ed36a22b6.tar.bz2 linux-5f16f3225b06242a9ee876f07c1c9b6ed36a22b6.zip | |
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
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 60829565e552..5d1f6fa8daed 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2556,6 +2556,9 @@ static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, void inode_dio_wait(struct inode *inode); void inode_dio_done(struct inode *inode); +extern void inode_set_flags(struct inode *inode, unsigned int flags, + unsigned int mask); + extern const struct file_operations generic_ro_fops; #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |