On Wed, Dec 9, 2020 at 5:36 AM Chris Murphy wrote:
> Small clarification. 'chattr +C' to set the C file attribute is
> 'nodatacow'. Since Btrfs is cow by default, it's generally OK to
> assume cow unless this attribute is set. But there's a rather uncommon
> and not highly recommended mount optio
On Wed, Dec 9, 2020 at 5:31 AM Chris Murphy wrote:
>
> I referred you to man 5 btrfs about a list of limitations of swapfiles
> on btrfs 10 days ago.
>
> https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org/message/XF7YO27N2XPWGLPMPUN76VFT3RW2KFYS/
>
> It's important to kno
On Wed, Dec 9, 2020 at 5:31 AM Chris Murphy wrote:
> I referred you to man 5 btrfs about a list of limitations of swapfiles
> on btrfs 10 days ago.
>
> https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org/message/XF7YO27N2XPWGLPMPUN76VFT3RW2KFYS/
Apologies, I missed that.
On Tue, Dec 8, 2020 at 9:30 PM Qiyu Yan wrote:
> Since swapfile should always be NOCOW, while doing snapshot the subvol
> containing the file will definitely make it COW. You may want to put
> swapfile to a separate subvol.
>
Yes, you are right.
I just snapshotted my root, and restored the snap
On Tue, Dec 8, 2020 at 11:14 AM Garry T. Williams wrote:
>
> On Tuesday, December 8, 2020 1:02:19 PM EST Sreyan Chakravarty wrote:
> > How would you verify if a file is CoW in BTRFS?
>
> It's not btrfs-specific, but use the lsattr(1) command. E.g.,
>
> garry@gtw$ lsattr .local/share/akonadi/d
On Tue, Dec 8, 2020 at 5:53 AM Sreyan Chakravarty wrote:
>
> On Mon, Dec 7, 2020 at 3:43 PM Chris Murphy wrote:
>>
>>
>> This isn't a great location for a swapfile on btrfs because you can't ever
>> snapshot /.
>
>
> You never said why it was not possible to snapshot /.
>
> Why is that ?
I refe
On Tuesday, December 8, 2020 1:02:19 PM EST Sreyan Chakravarty wrote:
> How would you verify if a file is CoW in BTRFS?
It's not btrfs-specific, but use the lsattr(1) command. E.g.,
garry@gtw$ lsattr .local/share/akonadi/db_data/ibdata1
---C .local/share/akonadi/db_data/
On Tue, 8 Dec 2020, 9:30 pm Qiyu Yan, wrote:
> Since swapfile should always be NOCOW, while doing snapshot the subvol
> containing the file will definitely make it COW. You may want to put
> swapfile to a separate subvol.
>
How would you verify if a file is CoW in BTRFS?
>
_
Sreyan Chakravarty 于2020年12月8日周二 下午8:53写道：
>
> On Mon, Dec 7, 2020 at 3:43 PM Chris Murphy wrote:
>>
>>
>> This isn't a great location for a swapfile on btrfs because you can't ever
>> snapshot /.
>
>
> You never said why it was not possible to snapshot /.
Since swapfile should always be NOCOW,
On Mon, Dec 7, 2020 at 3:43 PM Chris Murphy wrote:
>
> This isn't a great location for a swapfile on btrfs because you can't ever
> snapshot /.
>
You never said why it was not possible to snapshot /.
Why is that ?
--
Regards,
Sreyan Chakravarty
___
On Mon, Dec 7, 2020 at 3:43 PM Chris Murphy wrote:
>
> The more predictable arrangement is a swap partition.
>
I did it.
The problem was that btrfs_map_physical script will actually output the
offset in bytes.
I had to divide by my block size 4096.
So the correct resume_offset is = 147455098
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