* [PATCH] Btrfs: do not defrag extent root in ioctl
@ 2013-10-08 10:19 Liu Bo
2013-10-08 14:16 ` David Sterba
0 siblings, 1 reply; 3+ messages in thread
From: Liu Bo @ 2013-10-08 10:19 UTC (permalink / raw)
To: linux-btrfs
We can't defrag the extent root without deadlock.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
fs/btrfs/ioctl.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9d46f60..12d8570 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2322,9 +2322,6 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
goto out;
}
ret = btrfs_defrag_root(root);
- if (ret)
- goto out;
- ret = btrfs_defrag_root(root->fs_info->extent_root);
break;
case S_IFREG:
if (!(file->f_mode & FMODE_WRITE)) {
--
1.8.1.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] Btrfs: do not defrag extent root in ioctl
2013-10-08 10:19 [PATCH] Btrfs: do not defrag extent root in ioctl Liu Bo
@ 2013-10-08 14:16 ` David Sterba
2013-10-09 2:45 ` Liu Bo
0 siblings, 1 reply; 3+ messages in thread
From: David Sterba @ 2013-10-08 14:16 UTC (permalink / raw)
To: Liu Bo; +Cc: linux-btrfs
On Tue, Oct 08, 2013 at 06:19:30PM +0800, Liu Bo wrote:
> We can't defrag the extent root without deadlock.
Deadlock under what circumstance? Eg. with snapshot aware defag turned
on or extent tree cannot be safely defragmented at all?
david
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Btrfs: do not defrag extent root in ioctl
2013-10-08 14:16 ` David Sterba
@ 2013-10-09 2:45 ` Liu Bo
0 siblings, 0 replies; 3+ messages in thread
From: Liu Bo @ 2013-10-09 2:45 UTC (permalink / raw)
To: dsterba, linux-btrfs
On Tue, Oct 08, 2013 at 04:16:23PM +0200, David Sterba wrote:
> On Tue, Oct 08, 2013 at 06:19:30PM +0800, Liu Bo wrote:
> > We can't defrag the extent root without deadlock.
>
> Deadlock under what circumstance? Eg. with snapshot aware defag turned
> on or extent tree cannot be safely defragmented at all?
Hmm, my assumption is based on the comments in btrfs_defrag_leaves(),
Quoting,
"there's recursion here right now in the tree locking, we can't defrag the
extent root without deadlock."
But I just made a quick test, defragment on extent root seems to be good.
I need to dig this more, thanks for pointing out that, Dave.
-liubo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-10-08 10:19 [PATCH] Btrfs: do not defrag extent root in ioctl Liu Bo
2013-10-08 14:16 ` David Sterba
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