Currently the debug-only xfs_bmap_exact_minlen_extent_alloc allocation variant fails to drop into the lowmode last restor 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@xxxxxx> --- fs/xfs/libxfs/xfs_bmap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index b5eeaea164ee46..784dd5dda2a1a2 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3493,7 +3493,13 @@ 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); + /* + * Use the low space allocator as it first does a "normal" AG iteration + * and then drops the reservation to 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); } #else -- 2.43.0
