From: Qu Wenruo Date: Sun, 30 Jan 2022 12:53:15 +0000 (+0800) Subject: btrfs: don't hold CPU for too long when defragging a file X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ea0eba69a2a8125229b1b6011644598039bc53aa;p=linux.git btrfs: don't hold CPU for too long when defragging a file 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.com Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 925522756e285..b51c8b783f40a 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1629,6 +1629,7 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, ret = 0; break; } + cond_resched(); } if (ra_allocated)