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