* Creating written extents beyond EOF
@ 2022-09-01 13:25 Chandan Babu R
2022-09-02 21:55 ` Dave Chinner
0 siblings, 1 reply; 3+ messages in thread
From: Chandan Babu R @ 2022-09-01 13:25 UTC (permalink / raw)
To: Dave Chinner; +Cc: linux-xfs
Hi Dave,
7684e2c4384d5d1f884b01ab8bff2369e4db0bff
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7684e2c4384d5d1f884b01ab8bff2369e4db0bff)
is one of the commits that needs to be backported to 5.4.y stable kernel.
The commit message mentions that we could have written extents beyond EOF. I
am unable to come up with a sequence of commands that could create such
extents.
Can you please explain how a user could create a file having written extents
beyond EOF?
--
chandan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Creating written extents beyond EOF
2022-09-01 13:25 Creating written extents beyond EOF Chandan Babu R
@ 2022-09-02 21:55 ` Dave Chinner
2022-09-06 6:55 ` Chandan Babu R
0 siblings, 1 reply; 3+ messages in thread
From: Dave Chinner @ 2022-09-02 21:55 UTC (permalink / raw)
To: Chandan Babu R; +Cc: linux-xfs
On Thu, Sep 01, 2022 at 06:55:31PM +0530, Chandan Babu R wrote:
> Hi Dave,
>
> 7684e2c4384d5d1f884b01ab8bff2369e4db0bff
> (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7684e2c4384d5d1f884b01ab8bff2369e4db0bff)
> is one of the commits that needs to be backported to 5.4.y stable kernel.
>
> The commit message mentions that we could have written extents beyond EOF. I
> am unable to come up with a sequence of commands that could create such
> extents.
>
> Can you please explain how a user could create a file having written extents
> beyond EOF?
That bug fix was committed in v5.5. We didn't convert delalloc to
use unwritten extents until v5.8 via commit a5949d3faedf.
-Dave.
--
Dave Chinner
david@fromorbit.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Creating written extents beyond EOF
2022-09-02 21:55 ` Dave Chinner
@ 2022-09-06 6:55 ` Chandan Babu R
0 siblings, 0 replies; 3+ messages in thread
From: Chandan Babu R @ 2022-09-06 6:55 UTC (permalink / raw)
To: Dave Chinner; +Cc: linux-xfs
On Sat, Sep 03, 2022 at 07:55:16 AM +1000, Dave Chinner wrote:
> On Thu, Sep 01, 2022 at 06:55:31PM +0530, Chandan Babu R wrote:
>> Hi Dave,
>>
>> 7684e2c4384d5d1f884b01ab8bff2369e4db0bff
>> (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7684e2c4384d5d1f884b01ab8bff2369e4db0bff)
>> is one of the commits that needs to be backported to 5.4.y stable kernel.
>>
>> The commit message mentions that we could have written extents beyond EOF. I
>> am unable to come up with a sequence of commands that could create such
>> extents.
>>
>> Can you please explain how a user could create a file having written extents
>> beyond EOF?
>
> That bug fix was committed in v5.5. We didn't convert delalloc to
> use unwritten extents until v5.8 via commit a5949d3faedf.
>
Ok. Thanks for clarifying my doubt. I can now recreate the bug on my test
machine when running v5.4 LTS kernel.
--
chandan
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-09-01 13:25 Creating written extents beyond EOF Chandan Babu R
2022-09-02 21:55 ` Dave Chinner
2022-09-06 6:55 ` Chandan Babu R
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