xfs: create a helper to convert rtextents to rtblocks

Create a helper to convert a realtime extent to a realtime block.  Later
on we'll change the helper to use bit shifts when possible.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: Darrick J. Wong

fs/xfs/libxfs/xfs_rtbitmap.h

@@ -6,6 +6,22 @@
 #ifndef __XFS_RTBITMAP_H__
 #define	__XFS_RTBITMAP_H__
 
+static inline xfs_rtblock_t
+xfs_rtx_to_rtb(
+	struct xfs_mount	*mp,
+	xfs_rtxnum_t		rtx)
+{
+	return rtx * mp->m_sb.sb_rextsize;
+}
+
+static inline xfs_extlen_t
+xfs_rtxlen_to_extlen(
+	struct xfs_mount	*mp,
+	xfs_rtxlen_t		rtxlen)
+{
+	return rtxlen * mp->m_sb.sb_rextsize;
+}
+
 /*
  * Functions for walking free space rtextents in the realtime bitmap.
  */

fs/xfs/scrub/rtbitmap.c

@@ -50,8 +50,8 @@ xchk_rtbitmap_rec(
 	xfs_rtblock_t		startblock;
 	xfs_filblks_t		blockcount;
 
-	startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
-	blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
+	startblock = xfs_rtx_to_rtb(mp, rec->ar_startext);
+	blockcount = xfs_rtx_to_rtb(mp, rec->ar_extcount);
 
 	if (!xfs_verify_rtbext(mp, startblock, blockcount))
 		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);

fs/xfs/scrub/rtsummary.c

@@ -134,8 +134,8 @@ xchk_rtsum_record_free(
 	lenlog = XFS_RTBLOCKLOG(rec->ar_extcount);
 	offs = XFS_SUMOFFS(mp, lenlog, rbmoff);
 
-	rtbno = rec->ar_startext * mp->m_sb.sb_rextsize;
-	rtlen = rec->ar_extcount * mp->m_sb.sb_rextsize;
+	rtbno = xfs_rtx_to_rtb(mp, rec->ar_startext);
+	rtlen = xfs_rtx_to_rtb(mp, rec->ar_extcount);
 
 	if (!xfs_verify_rtbext(mp, rtbno, rtlen)) {
 		xchk_ino_xref_set_corrupt(sc, mp->m_rbmip->i_ino);

fs/xfs/xfs_bmap_util.c

@@ -28,6 +28,7 @@
 #include "xfs_icache.h"
 #include "xfs_iomap.h"
 #include "xfs_reflink.h"
+#include "xfs_rtbitmap.h"
 
 /* Kernel only BMAP related definitions and functions */
 
@@ -125,7 +126,7 @@ xfs_bmap_rtalloc(
 	 * XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't
 	 * adjust the starting point to match it.
 	 */
-	if (ralen * mp->m_sb.sb_rextsize >= XFS_MAX_BMBT_EXTLEN)
+	if (xfs_rtxlen_to_extlen(mp, ralen) >= XFS_MAX_BMBT_EXTLEN)
 		ralen = XFS_MAX_BMBT_EXTLEN / mp->m_sb.sb_rextsize;
 
 	/*
@@ -147,7 +148,7 @@ xfs_bmap_rtalloc(
 		error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
 		if (error)
 			return error;
-		ap->blkno = rtx * mp->m_sb.sb_rextsize;
+		ap->blkno = xfs_rtx_to_rtb(mp, rtx);
 	} else {
 		ap->blkno = 0;
 	}
@@ -170,8 +171,8 @@ xfs_bmap_rtalloc(
 		return error;
 
 	if (rtx != NULLRTEXTNO) {
-		ap->blkno = rtx * mp->m_sb.sb_rextsize;
-		ap->length = ralen * mp->m_sb.sb_rextsize;
+		ap->blkno = xfs_rtx_to_rtb(mp, rtx);
+		ap->length = xfs_rtxlen_to_extlen(mp, ralen);
 		ap->ip->i_nblocks += ap->length;
 		xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
 		if (ap->wasdel)

fs/xfs/xfs_fsmap.c

@@ -483,11 +483,11 @@ xfs_getfsmap_rtdev_rtbitmap_helper(
 	xfs_rtblock_t			rtbno;
 	xfs_daddr_t			rec_daddr, len_daddr;
 
-	rtbno = rec->ar_startext * mp->m_sb.sb_rextsize;
+	rtbno = xfs_rtx_to_rtb(mp, rec->ar_startext);
 	rec_daddr = XFS_FSB_TO_BB(mp, rtbno);
 	irec.rm_startblock = rtbno;
 
-	rtbno = rec->ar_extcount * mp->m_sb.sb_rextsize;
+	rtbno = xfs_rtx_to_rtb(mp, rec->ar_extcount);
 	len_daddr = XFS_FSB_TO_BB(mp, rtbno);
 	irec.rm_blockcount = rtbno;
 
@@ -514,7 +514,7 @@ xfs_getfsmap_rtdev_rtbitmap(
 	uint64_t			eofs;
 	int				error;
 
-	eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rextents * mp->m_sb.sb_rextsize);
+	eofs = XFS_FSB_TO_BB(mp, xfs_rtx_to_rtb(mp, mp->m_sb.sb_rextents));
 	if (keys[0].fmr_physical >= eofs)
 		return 0;
 	start_rtb = XFS_BB_TO_FSBT(mp,

fs/xfs/xfs_super.c

@@ -42,6 +42,7 @@
 #include "xfs_xattr.h"
 #include "xfs_iunlink_item.h"
 #include "xfs_dahash_test.h"
+#include "xfs_rtbitmap.h"
 #include "scrub/stats.h"
 
 #include <linux/magic.h>
@@ -890,7 +891,7 @@ xfs_fs_statfs(
 
 		statp->f_blocks = sbp->sb_rblocks;
 		freertx = percpu_counter_sum_positive(&mp->m_frextents);
-		statp->f_bavail = statp->f_bfree = freertx * sbp->sb_rextsize;
+		statp->f_bavail = statp->f_bfree = xfs_rtx_to_rtb(mp, freertx);
 	}
 
 	return 0;