From: Qu Wenruo wqu@suse.com
commit ea0eba69a2a8125229b1b6011644598039bc53aa upstream.
There is a user report about "btrfs filesystem defrag" causing 120s timeout problem.
For btrfs_defrag_file() it will iterate all file extents if called from defrag ioctl, thus it can take a long time.
There is no reason not to release the CPU during such a long operation.
Add cond_resched() after defragged one cluster.
CC: stable@vger.kernel.org # 5.16 Link: https://lore.kernel.org/linux-btrfs/10e51417-2203-f0a4-2021-86c8511cc367@gmx... Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/ioctl.c | 1 + 1 file changed, 1 insertion(+)
--- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1603,6 +1603,7 @@ int btrfs_defrag_file(struct inode *inod ret = 0; break; } + cond_resched(); }
if (ra_allocated)