APPLIED: [SRU focal:linux-hwe-5.11] xfs: map unwritten blocks in XFS_IOC_{ALLOC, FREE}SP just like fallocate

[Stefan Bader]

On 25.01.22 12:15, Stefan Bader wrote:
> On 20.01.22 15:31, Thadeu Lima de Souza Cascardo wrote:
>> From: "Darrick J. Wong" <djwong at kernel.org>
>>
>> The old ALLOCSP/FREESP ioctls in XFS can be used to preallocate space at
>> the end of files, just like fallocate and RESVSP.  Make the behavior
>> consistent with the other ioctls.
>>
>> Reported-by: Kirill Tkhai <ktkhai at virtuozzo.com>
>> Signed-off-by: Darrick J. Wong <djwong at kernel.org>
>> Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
>> Reviewed-by: Dave Chinner <dchinner at redhat.com>
>> Reviewed-by: Eric Sandeen <sandeen at redhat.com>
>> (cherry picked from commit 983d8e60f50806f90534cc5373d0ce867e5aaf79)
>> CVE-2021-4155
>> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at canonical.com>
>> ---
> 
> Applied to focal:linux-hwe-5.11/hwe-5.11-next. This is taking over for 
> impish:linux. Thanks.

I clearly _mean_ hirsute:linux... sorry

-Stefan

> 
> -Stefan
> 
>>   fs/xfs/xfs_ioctl.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
>> index 1fe4c1fc0aea..feebc9c2c2aa 100644
>> --- a/fs/xfs/xfs_ioctl.c
>> +++ b/fs/xfs/xfs_ioctl.c
>> @@ -687,7 +687,8 @@ xfs_ioc_space(
>>       if (bf->l_start > XFS_ISIZE(ip)) {
>>           error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
>> -                bf->l_start - XFS_ISIZE(ip), 0);
>> +                bf->l_start - XFS_ISIZE(ip),
>> +                XFS_BMAPI_PREALLOC);
>>           if (error)
>>               goto out_unlock;
>>       }
> 
> 

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