@@ -66,6 +66,7 @@ typedef struct xfs_alloc_arg {
#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
#define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */
+#define XFS_ALLOC_FORCEALIGN (1 << 3)/* forced extent alignment */
/* freespace limit calculations */
unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
@@ -3401,9 +3401,10 @@ xfs_bmap_alloc_account(
* Calculate the extent start alignment and the extent length adjustments that
* constrain this allocation.
*
- * Extent start alignment is currently determined by stripe configuration and is
- * carried in args->alignment, whilst extent length adjustment is determined by
- * extent size hints and is carried by args->prod and args->mod.
+ * Extent start alignment is currently determined by forced inode alignment or
+ * stripe configuration and is carried in args->alignment, whilst extent length
+ * adjustment is determined by extent size hints and is carried by args->prod
+ * and args->mod.
*
* Low level allocation code is free to either ignore or override these values
* as required.
@@ -3416,11 +3417,18 @@ xfs_bmap_compute_alignments(
struct xfs_mount *mp = args->mp;
xfs_extlen_t align = 0; /* minimum allocation alignment */
- /* stripe alignment for allocation is determined by mount parameters */
- if (mp->m_swidth && xfs_has_swalloc(mp))
+ /*
+ * Forced inode alignment takes preference over stripe alignment.
+ * Stripe alignment for allocation is determined by mount parameters.
+ */
+ if (xfs_inode_has_forcealign(ap->ip)) {
+ args->alignment = xfs_get_extsz_hint(ap->ip);
+ args->datatype |= XFS_ALLOC_FORCEALIGN;
+ } else if (mp->m_swidth && xfs_has_swalloc(mp)) {
args->alignment = mp->m_swidth;
- else if (mp->m_dalign)
+ } else if (mp->m_dalign) {
args->alignment = mp->m_dalign;
+ }
if (ap->flags & XFS_BMAPI_COWFORK)
align = xfs_get_cowextsz_hint(ap->ip);
@@ -3607,6 +3615,11 @@ xfs_bmap_btalloc_low_space(
{
int error;
+ if (args->alignment > 1 && (args->datatype & XFS_ALLOC_FORCEALIGN)) {
+ args->fsbno = NULLFSBLOCK;
+ return 0;
+ }
+
args->alignment = 1;
if (args->minlen > ap->minlen) {
args->minlen = ap->minlen;
@@ -3658,6 +3671,8 @@ xfs_bmap_btalloc_filestreams(
/* Attempt non-aligned allocation if we haven't already. */
if (!error && args->fsbno == NULLFSBLOCK && args->alignment > 1) {
+ if (args->datatype & XFS_ALLOC_FORCEALIGN)
+ return error;
args->alignment = 1;
error = xfs_alloc_vextent_near_bno(args, ap->blkno);
}
@@ -3716,6 +3731,8 @@ xfs_bmap_btalloc_best_length(
/* Attempt non-aligned allocation if we haven't already. */
if (!error && args->fsbno == NULLFSBLOCK && args->alignment > 1) {
+ if (args->datatype & XFS_ALLOC_FORCEALIGN)
+ return error;
args->alignment = 1;
error = xfs_alloc_vextent_start_ag(args, ap->blkno);
}
@@ -311,6 +311,11 @@ static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip)
return ip->i_diflags2 & XFS_DIFLAG2_NREXT64;
}
+static inline bool xfs_inode_has_forcealign(struct xfs_inode *ip)
+{
+ return false;
+}
+
/*
* Decide if this file is a realtime file whose data allocation unit is larger
* than a single filesystem block.