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Avoid this by always aligning args->minlen appropriately. If alignment of minlen results in a value smaller than the alignment constraint, fail the allocation immediately. Signed-off-by: Dave Chinner Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_bmap.c | 45 +++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 14 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 9131ba8113a6..c9cf138e13c4 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3278,33 +3278,48 @@ xfs_bmap_longest_free_extent( return 0; } -static xfs_extlen_t +static int xfs_bmap_select_minlen( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t blen) { - /* Adjust best length for extent start alignment. */ if (blen > args->alignment) blen -= args->alignment; /* * Since we used XFS_ALLOC_FLAG_TRYLOCK in _longest_free_extent(), it is - * possible that there is enough contiguous free space for this request. + * possible that there is enough contiguous free space for this request + * even if best length is less that the minimum length we need. + * + * If the best length won't satisfy the maximum length we requested, + * then use it as the minimum length so we get as large an allocation + * as possible. */ if (blen < ap->minlen) - return ap->minlen; + blen = ap->minlen; + else if (blen > args->maxlen) + blen = args->maxlen; /* - * If the best seen length is less than the request length, - * use the best as the minimum, otherwise we've got the maxlen we - * were asked for. + * If we have alignment constraints, round the minlen down to match the + * constraint so that alignment will be attempted. This may reduce the + * allocation to smaller than was requested, so clamp the minimum to + * ap->minlen to allow unaligned allocation to succeed. If we are forced + * to align the allocation, return ENOSPC at this point because we don't + * have enough contiguous free space to guarantee aligned allocation. */ - if (blen < args->maxlen) - return blen; - return args->maxlen; - + if (args->alignment > 1) { + blen = rounddown(blen, args->alignment); + if (blen < ap->minlen) { + if (args->datatype & XFS_ALLOC_FORCEALIGN) + return -ENOSPC; + blen = ap->minlen; + } + } + args->minlen = blen; + return 0; } static int @@ -3340,8 +3355,7 @@ xfs_bmap_btalloc_select_lengths( if (pag) xfs_perag_rele(pag); - args->minlen = xfs_bmap_select_minlen(ap, args, blen); - return error; + return xfs_bmap_select_minlen(ap, args, blen); } /* Update all inode and quota accounting for the allocation we just did. */ @@ -3661,7 +3675,10 @@ xfs_bmap_btalloc_filestreams( goto out_low_space; } - args->minlen = xfs_bmap_select_minlen(ap, args, blen); + error = xfs_bmap_select_minlen(ap, args, blen); + if (error) + goto out_low_space; + if (ap->aeof && ap->offset) error = xfs_bmap_btalloc_at_eof(ap, args);