6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christoph Hellwig hch@lst.de
commit 6aac77059881e4419df499392c995bf02fb9630b upstream.
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 Signed-off-by: Catherine Hoang catherine.hoang@oracle.com Acked-by: Darrick J. Wong djwong@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/xfs/libxfs/xfs_bmap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3412,7 +3412,13 @@ 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); }
/*