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xfs: support lowmode allocations in xfs_bmap_exact_minlen_extent_alloc

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Currently the debug-only xfs_bmap_exact_minlen_extent_alloc allocation
variant fails to drop into the lowmode last resort allocator, and
thus can sometimes fail allocations for which the caller has a
transaction block reservation.

Fix this by using xfs_bmap_btalloc_low_space to do the actual allocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-09-18 07:30:10 +02:00 committed by Carlos Maiolino
parent 405ee87c69
commit 6aac770598
1 changed files with 7 additions and 1 deletions
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8
fs/xfs/libxfs/xfs_bmap.c
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@ -3501,7 +3501,13 @@ xfs_bmap_exact_minlen_extent_alloc(
*/
ap->blkno = XFS_AGB_TO_FSB(ap->ip->i_mount, 0, 0);
return xfs_alloc_vextent_first_ag(args, ap->blkno);
/*
* Call xfs_bmap_btalloc_low_space here as it first does a "normal" AG
* iteration and then drops args->total to args->minlen, which might be
* required to find an allocation for the transaction reservation when
* the file system is very full.
*/
return xfs_bmap_btalloc_low_space(ap, args);
}
/*