xfs: Compute bmap extent alignments in a separate function

This commit moves over the code which computes stripe alignment and
extent size hint alignment into a separate function. Apart from
xfs_bmap_btalloc(), the new function will be used by another function
introduced in a future commit.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Chandan Babu R 2021-01-22 16:48:16 -08:00 коммит произвёл Darrick J. Wong
Родитель aff4db57d5
Коммит 0961fddfdd
1 изменённых файлов: 52 добавлений и 37 удалений

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@ -3463,13 +3463,59 @@ xfs_bmap_btalloc_accounting(
args->len);
}
static int
xfs_bmap_compute_alignments(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args)
{
struct xfs_mount *mp = args->mp;
xfs_extlen_t align = 0; /* minimum allocation alignment */
int stripe_align = 0;
int error;
/* stripe alignment for allocation is determined by mount parameters */
if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
stripe_align = mp->m_swidth;
else if (mp->m_dalign)
stripe_align = mp->m_dalign;
if (ap->flags & XFS_BMAPI_COWFORK)
align = xfs_get_cowextsz_hint(ap->ip);
else if (ap->datatype & XFS_ALLOC_USERDATA)
align = xfs_get_extsz_hint(ap->ip);
if (align) {
error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
align, 0, ap->eof, 0, ap->conv,
&ap->offset, &ap->length);
ASSERT(!error);
ASSERT(ap->length);
}
/* apply extent size hints if obtained earlier */
if (align) {
args->prod = align;
div_u64_rem(ap->offset, args->prod, &args->mod);
if (args->mod)
args->mod = args->prod - args->mod;
} else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
args->prod = 1;
args->mod = 0;
} else {
args->prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
div_u64_rem(ap->offset, args->prod, &args->mod);
if (args->mod)
args->mod = args->prod - args->mod;
}
return stripe_align;
}
STATIC int
xfs_bmap_btalloc(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
xfs_mount_t *mp; /* mount point structure */
xfs_alloctype_t atype = 0; /* type for allocation routines */
xfs_extlen_t align = 0; /* minimum allocation alignment */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_agnumber_t ag;
xfs_alloc_arg_t args;
@ -3489,25 +3535,11 @@ xfs_bmap_btalloc(
mp = ap->ip->i_mount;
/* stripe alignment for allocation is determined by mount parameters */
stripe_align = 0;
if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
stripe_align = mp->m_swidth;
else if (mp->m_dalign)
stripe_align = mp->m_dalign;
if (ap->flags & XFS_BMAPI_COWFORK)
align = xfs_get_cowextsz_hint(ap->ip);
else if (ap->datatype & XFS_ALLOC_USERDATA)
align = xfs_get_extsz_hint(ap->ip);
if (align) {
error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
align, 0, ap->eof, 0, ap->conv,
&ap->offset, &ap->length);
ASSERT(!error);
ASSERT(ap->length);
}
memset(&args, 0, sizeof(args));
args.tp = ap->tp;
args.mp = mp;
stripe_align = xfs_bmap_compute_alignments(ap, &args);
nullfb = ap->tp->t_firstblock == NULLFSBLOCK;
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp,
@ -3538,9 +3570,6 @@ xfs_bmap_btalloc(
* Normal allocation, done through xfs_alloc_vextent.
*/
tryagain = isaligned = 0;
memset(&args, 0, sizeof(args));
args.tp = ap->tp;
args.mp = mp;
args.fsbno = ap->blkno;
args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
@ -3571,21 +3600,7 @@ xfs_bmap_btalloc(
args.total = ap->total;
args.minlen = ap->minlen;
}
/* apply extent size hints if obtained earlier */
if (align) {
args.prod = align;
div_u64_rem(ap->offset, args.prod, &args.mod);
if (args.mod)
args.mod = args.prod - args.mod;
} else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
args.prod = 1;
args.mod = 0;
} else {
args.prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
div_u64_rem(ap->offset, args.prod, &args.mod);
if (args.mod)
args.mod = args.prod - args.mod;
}
/*
* If we are not low on available data blocks, and the underlying
* logical volume manager is a stripe, and the file offset is zero then