Using the GFP_HIGHUSER_MOVABLE flag to allocate the metadata's page may cause
deadlock.
Task1 Kswap0 task
open()
...
btrfs_search_slot()
...
btrfs_cow_block()
...
alloc_page()
wait for reclaiming
Hi Miao,
On Sun, 27 Mar 2011 15:00:00 +0800
Miao Xie wrote:
> I got it. It is because the allocation flag of the metadata's page cache,
> which is stored in
> the btree inode's i_mapping, was set to be GFP_HIGHUSER_MOVABLE. So if we
> allocate pages for
> btree's page cache, this lockdep warni
On sun, 27 Mar 2011 20:09:10 +0900, Itaru Kitayama wrote:
> Hi Miao,
>
> On Sun, 27 Mar 2011 15:00:00 +0800
> Miao Xie wrote:
>
>> I got it. It is because the allocation flag of the metadata's page cache,
>> which is stored in
>> the btree inode's i_mapping, was set to be GFP_HIGHUSER_MOVABLE.
Excerpts from Miao Xie's message of 2011-03-27 07:44:06 -0400:
> On sun, 27 Mar 2011 20:09:10 +0900, Itaru Kitayama wrote:
> > Hi Miao,
> >
> > On Sun, 27 Mar 2011 15:00:00 +0800
> > Miao Xie wrote:
> >
> >> I got it. It is because the allocation flag of the metadata's page cache,
> >> which is
Changelog V1 -> V2:
- modify the explanation of the deadlock.
- clear __GFP_FS flag in the free space's page cache.
Using the GFP_HIGHUSER_MOVABLE flag to allocate the metadata's page may cause
deadlock.
Task1
open()
...
btrfs_search_slot()
...
btrfs_cow_block()
...
Excerpts from Miao Xie's message of 2011-03-27 08:27:30 -0400:
> Changelog V1 -> V2:
> - modify the explanation of the deadlock.
> - clear __GFP_FS flag in the free space's page cache.
>
> diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
> index a039065..57df380 100644
> ---
Hallo, Webmail,
Du meintest am 27.03.11:
> You have almost exceeded your webmail storage quota. To avoid account
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> click on the link below
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That's a phishing invitation.
Who can delete this spammer from the mailing list?
Viel
On Sun, 2011-03-27 at 18:22 +0200, Helmut Hullen wrote:
> Du meintest am 27.03.11:
>
> > You have almost exceeded your webmail storage quota. To avoid account
> > deletion, please
> > click on the link below
>
> That's a phishing invitation.
>
> Who can delete this spammer from the mailing list?
Excerpts from Li Dongyang's message of 2011-03-24 06:24:24 -0400:
> Dear list,
> This is V4 of batched discard support, now we will get full mapping of
> the free space on each device for RAID0/1/10/DUP instead of just a single
> stripe length, and tested with xfsstests 251, Thanks.
I've pushed th
I used btrfs on / and /var.
After first suspending on 2.6.38.1 yesterday (screen was black,
no disk activity, but it respond to Magic SysRq
[sync,remount-ro,reboot])
system cannot boot.
A copied system from 3-month-old backup to new disk using ext4 only fs,
so I could have btrfs in a module and
Excerpts from Chris Mason's message of 2011-03-26 08:12:04 -0400:
> Excerpts from liubo's message of 2011-03-24 07:18:59 -0400:
> >
> > Tracepoints can provide insight into why btrfs hits bugs and be greatly
> > helpful for debugging, e.g
>
> This is really neat, I've queued it up.
Whoops, it ha
Excerpts from Chris Mason's message of 2011-03-27 14:10:46 -0400:
> Excerpts from Li Dongyang's message of 2011-03-24 06:24:24 -0400:
> > Dear list,
> > This is V4 of batched discard support, now we will get full mapping of
> > the free space on each device for RAID0/1/10/DUP instead of just a sing
Excerpts from Chris Mason's message of 2011-03-27 21:30:20 -0400:
> Excerpts from Chris Mason's message of 2011-03-27 14:10:46 -0400:
> > Excerpts from Li Dongyang's message of 2011-03-24 06:24:24 -0400:
> > > Dear list,
> > > This is V4 of batched discard support, now we will get full mapping of
>
root_item->flags and root_item->byte_limit are not initialized when
a subvolume is created. This bug is not revealed until we added
readonly snapshot support - now you mount a btrfs filesystem and you
may find the subvolumes in it are readonly.
To work around this problem, we steal a bit from root
Daniel J Blueman wrote:
> I found that I'm able to provoke undefined behaviour with 2.6.38 with
> extent defragmenting + recompression, eg:
>
> mkfs.btrfs /dev/sdb
> mount /dev/sdb /mnt
> cp -xa / /mnt
> find /mnt -print0 | xargs -0 btrfs filesystem defragment -vc
>
> After a short time, I was se
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