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xfs: fix exchmaps reservation limit check

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xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt
overhead to a local resblks variable, but the final UINT_MAX
check still tests req->resblks.  That is the reservation value
from before the overhead was added.

The computed value is stored back in req->resblks and later passed
to xfs_trans_alloc(), whose block reservation argument is unsigned
int.  Check the computed reservation so the existing limit applies
to the value that will be used.

Fixes: 966ceafc7a ("xfs: create deferred log items for file mapping exchanges")
Cc: stable@vger.kernel.org # v6.10
Signed-off-by: Yingjie Gao <gaoyingjie@uniontech.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Yingjie Gao 2026-06-04 20:03:17 +08:00 committed by Carlos Maiolino
parent 610c08cbe7
commit 0a5213bbff
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/libxfs/xfs_exchmaps.c
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@ -711,7 +711,7 @@ xfs_exchmaps_estimate_overhead(
return -ENOSPC;
/* Can't actually reserve more than UINT_MAX blocks. */
if (req->resblks > UINT_MAX)
if (resblks > UINT_MAX)
return -ENOSPC;
req->resblks = resblks;