From: Dmitry Monakhov <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== commit 7e775f46a125f894a1d71e96797c776dbec161f0 upstream. Pipe has no data associated with fs so it is not good idea to block pipe_write() if FS is frozen, but we can not update file's time on such filesystem. Let's use same idea as we use in touch_time(). Addresses https://bugzilla.kernel.org/show_bug.cgi?id=65701 Signed-off-by: Dmitry Monakhov <[email protected]> Reviewed-by: Jan Kara <[email protected]> Cc: Al Viro <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- fs/pipe.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/pipe.c b/fs/pipe.c index c281867c453e..fff8057a0809 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -681,10 +681,11 @@ out: wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM); kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); } - if (ret > 0) { + if (ret > 0 && sb_start_write_trylock(file_inode(filp)->i_sb)) { int err = file_update_time(filp); if (err) ret = err; + sb_end_write(file_inode(filp)->i_sb); } return ret; } -- 2.8.1
