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xfs: allow block allocator to take an alignment hint

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Add a BMAPI flag to provide a hint to the block allocator to align extents
according to the extszhint.

This will be useful for atomic writes to ensure that we are not being
allocated extents which are not suitable (for atomic writes).

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
This commit is contained in:
John Garry
2025-05-07 14:18:27 -07:00
committed by Darrick J. Wong
parent 85bf2dfa3f
commit 6baf4cc47a
2 changed files with 10 additions and 1 deletions
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5
fs/xfs/libxfs/xfs_bmap.c
View File

@@ -3312,6 +3312,11 @@ xfs_bmap_compute_alignments(
align = xfs_get_cowextsz_hint(ap->ip);
else if (ap->datatype & XFS_ALLOC_USERDATA)
align = xfs_get_extsz_hint(ap->ip);
/* Try to align start block to any minimum allocation alignment */
if (align > 1 && (ap->flags & XFS_BMAPI_EXTSZALIGN))
args->alignment = align;
if (align) {
if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0,
ap->eof, 0, ap->conv, &ap->offset,

6
fs/xfs/libxfs/xfs_bmap.h
View File

@@ -87,6 +87,9 @@ struct xfs_bmalloca {
/* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
#define XFS_BMAPI_NORMAP (1u << 10)
/* Try to align allocations to the extent size hint */
#define XFS_BMAPI_EXTSZALIGN (1u << 11)
#define XFS_BMAPI_FLAGS \
{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
{ XFS_BMAPI_METADATA, "METADATA" }, \
@@ -98,7 +101,8 @@ struct xfs_bmalloca {
{ XFS_BMAPI_REMAP, "REMAP" }, \
{ XFS_BMAPI_COWFORK, "COWFORK" }, \
{ XFS_BMAPI_NODISCARD, "NODISCARD" }, \
{ XFS_BMAPI_NORMAP, "NORMAP" }
{ XFS_BMAPI_NORMAP, "NORMAP" },\
{ XFS_BMAPI_EXTSZALIGN, "EXTSZALIGN" }
static inline int xfs_bmapi_aflag(int w)