diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-03-01 16:12:47 +0100 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-07 16:15:16 -0600 |
| commit | 2113379c232de33524ccba0b118c0c016abcabce (patch) | |
| tree | ffaa767a1c304b5ff635138f85b86499c8f1a904 | |
| parent | 6094c325a166eea3f3f92bc1699e5d46dfcd1b18 (diff) | |
fs: Protect open coded isize seqcount
A writer might be preempted in the write side critical section on
RT. Disable preemption to avoid endless spinning of a preempting
reader.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
| -rw-r--r-- | include/linux/fs.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 99fb59ceba3b..415fb15f1698 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -903,9 +903,11 @@ static inline loff_t i_size_read(const struct inode *inode) static inline void i_size_write(struct inode *inode, loff_t i_size) { #if BITS_PER_LONG==32 && defined(CONFIG_SMP) + preempt_disable_rt(); write_seqcount_begin(&inode->i_size_seqcount); inode->i_size = i_size; write_seqcount_end(&inode->i_size_seqcount); + preempt_enable_rt(); #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) preempt_disable(); inode->i_size = i_size; |