Adding upstream version 6.7.7.upstream/6.7.7

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 930 insertions, 441 deletions

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 3069194527..100ab5931b 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -2275,16 +2275,37 @@ xfs_alloc_min_freelist(
 
 	ASSERT(mp->m_alloc_maxlevels > 0);
 
+	/*
+	 * For a btree shorter than the maximum height, the worst case is that
+	 * every level gets split and a new level is added, then while inserting
+	 * another entry to refill the AGFL, every level under the old root gets
+	 * split again. This is:
+	 *
+	 *   (full height split reservation) + (AGFL refill split height)
+	 * = (current height + 1) + (current height - 1)
+	 * = (new height) + (new height - 2)
+	 * = 2 * new height - 2
+	 *
+	 * For a btree of maximum height, the worst case is that every level
+	 * under the root gets split, then while inserting another entry to
+	 * refill the AGFL, every level under the root gets split again. This is
+	 * also:
+	 *
+	 *   2 * (current height - 1)
+	 * = 2 * (new height - 1)
+	 * = 2 * new height - 2
+	 */
+
 	/* space needed by-bno freespace btree */
 	min_free = min_t(unsigned int, levels[XFS_BTNUM_BNOi] + 1,
-				       mp->m_alloc_maxlevels);
+				       mp->m_alloc_maxlevels) * 2 - 2;
 	/* space needed by-size freespace btree */
 	min_free += min_t(unsigned int, levels[XFS_BTNUM_CNTi] + 1,
-				       mp->m_alloc_maxlevels);
+				       mp->m_alloc_maxlevels) * 2 - 2;
 	/* space needed reverse mapping used space btree */
 	if (xfs_has_rmapbt(mp))
 		min_free += min_t(unsigned int, levels[XFS_BTNUM_RMAPi] + 1,
-						mp->m_rmap_maxlevels);
+						mp->m_rmap_maxlevels) * 2 - 2;
 
 	return min_free;
 }
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 30c931b388..be62acffad 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -21,7 +21,7 @@
 #include "xfs_bmap.h"
 #include "xfs_bmap_util.h"
 #include "xfs_bmap_btree.h"
-#include "xfs_rtalloc.h"
+#include "xfs_rtbitmap.h"
 #include "xfs_errortag.h"
 #include "xfs_error.h"
 #include "xfs_quota.h"
@@ -2989,7 +2989,7 @@ xfs_bmap_extsize_align(
 	 * If realtime, and the result isn't a multiple of the realtime
 	 * extent size we need to remove blocks until it is.
 	 */
-	if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
+	if (rt && (temp = xfs_extlen_to_rtxmod(mp, align_alen))) {
 		/*
 		 * We're not covering the original request, or
 		 * we won't be able to once we fix the length.
@@ -3016,7 +3016,7 @@ xfs_bmap_extsize_align(
 		else {
 			align_alen -= orig_off - align_off;
 			align_off = orig_off;
-			align_alen -= align_alen % mp->m_sb.sb_rextsize;
+			align_alen -= xfs_extlen_to_rtxmod(mp, align_alen);
 		}
 		/*
 		 * Result doesn't cover the request, fail it.
@@ -4826,12 +4826,8 @@ xfs_bmap_del_extent_delay(
 	ASSERT(got->br_startoff <= del->br_startoff);
 	ASSERT(got_endoff >= del_endoff);
 
-	if (isrt) {
-		uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
-
-		do_div(rtexts, mp->m_sb.sb_rextsize);
-		xfs_mod_frextents(mp, rtexts);
-	}
+	if (isrt)
+		xfs_mod_frextents(mp, xfs_rtb_to_rtx(mp, del->br_blockcount));
 
 	/*
 	 * Update the inode delalloc counter now and wait to update the
@@ -5057,33 +5053,20 @@ xfs_bmap_del_extent_real(
 
 	flags = XFS_ILOG_CORE;
 	if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
-		xfs_filblks_t	len;
-		xfs_extlen_t	mod;
-
-		len = div_u64_rem(del->br_blockcount, mp->m_sb.sb_rextsize,
-				  &mod);
-		ASSERT(mod == 0);
-
 		if (!(bflags & XFS_BMAPI_REMAP)) {
-			xfs_fsblock_t	bno;
-
-			bno = div_u64_rem(del->br_startblock,
-					mp->m_sb.sb_rextsize, &mod);
-			ASSERT(mod == 0);
-
-			error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
+			error = xfs_rtfree_blocks(tp, del->br_startblock,
+					del->br_blockcount);
 			if (error)
 				goto done;
 		}
 
 		do_fx = 0;
-		nblks = len * mp->m_sb.sb_rextsize;
 		qfield = XFS_TRANS_DQ_RTBCOUNT;
 	} else {
 		do_fx = 1;
-		nblks = del->br_blockcount;
 		qfield = XFS_TRANS_DQ_BCOUNT;
 	}
+	nblks = del->br_blockcount;
 
 	del_endblock = del->br_startblock + del->br_blockcount;
 	if (cur) {
@@ -5289,7 +5272,6 @@ __xfs_bunmapi(
 	int			tmp_logflags;	/* partial logging flags */
 	int			wasdel;		/* was a delayed alloc extent */
 	int			whichfork;	/* data or attribute fork */
-	xfs_fsblock_t		sum;
 	xfs_filblks_t		len = *rlen;	/* length to unmap in file */
 	xfs_fileoff_t		end;
 	struct xfs_iext_cursor	icur;
@@ -5384,8 +5366,8 @@ __xfs_bunmapi(
 		if (!isrt)
 			goto delete;
 
-		sum = del.br_startblock + del.br_blockcount;
-		div_u64_rem(sum, mp->m_sb.sb_rextsize, &mod);
+		mod = xfs_rtb_to_rtxoff(mp,
+				del.br_startblock + del.br_blockcount);
 		if (mod) {
 			/*
 			 * Realtime extent not lined up at the end.
@@ -5432,7 +5414,8 @@ __xfs_bunmapi(
 				goto error0;
 			goto nodelete;
 		}
-		div_u64_rem(del.br_startblock, mp->m_sb.sb_rextsize, &mod);
+
+		mod = xfs_rtb_to_rtxoff(mp, del.br_startblock);
 		if (mod) {
 			xfs_extlen_t off = mp->m_sb.sb_rextsize - mod;
 
@@ -6209,8 +6192,8 @@ xfs_bmap_validate_extent(
 		return __this_address;
 
 	if (XFS_IS_REALTIME_INODE(ip) && whichfork == XFS_DATA_FORK) {
-		if (!xfs_verify_rtext(mp, irec->br_startblock,
-					  irec->br_blockcount))
+		if (!xfs_verify_rtbext(mp, irec->br_startblock,
+					   irec->br_blockcount))
 			return __this_address;
 	} else {
 		if (!xfs_verify_fsbext(mp, irec->br_startblock,
diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index bcfb6a4203..f71679ce23 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -245,21 +245,18 @@ xfs_defer_create_intents(
 	return ret;
 }
 
-/* Abort all the intents that were committed. */
 STATIC void
-xfs_defer_trans_abort(
-	struct xfs_trans		*tp,
-	struct list_head		*dop_pending)
+xfs_defer_pending_abort(
+	struct xfs_mount		*mp,
+	struct list_head		*dop_list)
 {
 	struct xfs_defer_pending	*dfp;
 	const struct xfs_defer_op_type	*ops;
 
-	trace_xfs_defer_trans_abort(tp, _RET_IP_);
-
 	/* Abort intent items that don't have a done item. */
-	list_for_each_entry(dfp, dop_pending, dfp_list) {
+	list_for_each_entry(dfp, dop_list, dfp_list) {
 		ops = defer_op_types[dfp->dfp_type];
-		trace_xfs_defer_pending_abort(tp->t_mountp, dfp);
+		trace_xfs_defer_pending_abort(mp, dfp);
 		if (dfp->dfp_intent && !dfp->dfp_done) {
 			ops->abort_intent(dfp->dfp_intent);
 			dfp->dfp_intent = NULL;
@@ -267,6 +264,16 @@ xfs_defer_trans_abort(
 	}
 }
 
+/* Abort all the intents that were committed. */
+STATIC void
+xfs_defer_trans_abort(
+	struct xfs_trans		*tp,
+	struct list_head		*dop_pending)
+{
+	trace_xfs_defer_trans_abort(tp, _RET_IP_);
+	xfs_defer_pending_abort(tp->t_mountp, dop_pending);
+}
+
 /*
  * Capture resources that the caller said not to release ("held") when the
  * transaction commits.  Caller is responsible for zero-initializing @dres.
@@ -756,12 +763,13 @@ xfs_defer_ops_capture(
 
 /* Release all resources that we used to capture deferred ops. */
 void
-xfs_defer_ops_capture_free(
+xfs_defer_ops_capture_abort(
 	struct xfs_mount		*mp,
 	struct xfs_defer_capture	*dfc)
 {
 	unsigned short			i;
 
+	xfs_defer_pending_abort(mp, &dfc->dfc_dfops);
 	xfs_defer_cancel_list(mp, &dfc->dfc_dfops);
 
 	for (i = 0; i < dfc->dfc_held.dr_bufs; i++)
@@ -802,7 +810,7 @@ xfs_defer_ops_capture_and_commit(
 	/* Commit the transaction and add the capture structure to the list. */
 	error = xfs_trans_commit(tp);
 	if (error) {
-		xfs_defer_ops_capture_free(mp, dfc);
+		xfs_defer_ops_capture_abort(mp, dfc);
 		return error;
 	}
 
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index 114a3a4930..8788ad5f6a 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -121,7 +121,7 @@ int xfs_defer_ops_capture_and_commit(struct xfs_trans *tp,
 		struct list_head *capture_list);
 void xfs_defer_ops_continue(struct xfs_defer_capture *d, struct xfs_trans *tp,
 		struct xfs_defer_resources *dres);
-void xfs_defer_ops_capture_free(struct xfs_mount *mp,
+void xfs_defer_ops_capture_abort(struct xfs_mount *mp,
 		struct xfs_defer_capture *d);
 void xfs_defer_resources_rele(struct xfs_defer_resources *dres);
 
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 371dc07233..9a88aba158 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -98,7 +98,7 @@ typedef struct xfs_sb {
 	uint32_t	sb_blocksize;	/* logical block size, bytes */
 	xfs_rfsblock_t	sb_dblocks;	/* number of data blocks */
 	xfs_rfsblock_t	sb_rblocks;	/* number of realtime blocks */
-	xfs_rtblock_t	sb_rextents;	/* number of realtime extents */
+	xfs_rtbxlen_t	sb_rextents;	/* number of realtime extents */
 	uuid_t		sb_uuid;	/* user-visible file system unique id */
 	xfs_fsblock_t	sb_logstart;	/* starting block of log if internal */
 	xfs_ino_t	sb_rootino;	/* root inode number */
@@ -691,6 +691,22 @@ struct xfs_agfl {
 		   xfs_daddr_to_agno(mp, (d) + (len) - 1)))
 
 /*
+ * Realtime bitmap information is accessed by the word, which is currently
+ * stored in host-endian format.
+ */
+union xfs_rtword_raw {
+	__u32		old;
+};
+
+/*
+ * Realtime summary counts are accessed by the word, which is currently
+ * stored in host-endian format.
+ */
+union xfs_suminfo_raw {
+	__u32		old;
+};
+
+/*
  * XFS Timestamps
  * ==============
  *
@@ -1142,24 +1158,10 @@ static inline bool xfs_dinode_has_large_extent_counts(
 
 #define	XFS_BLOCKSIZE(mp)	((mp)->m_sb.sb_blocksize)
 #define	XFS_BLOCKMASK(mp)	((mp)->m_blockmask)
-#define	XFS_BLOCKWSIZE(mp)	((mp)->m_blockwsize)
-#define	XFS_BLOCKWMASK(mp)	((mp)->m_blockwmask)
 
 /*
- * RT Summary and bit manipulation macros.
+ * RT bit manipulation macros.
  */
-#define	XFS_SUMOFFS(mp,ls,bb)	((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
-#define	XFS_SUMOFFSTOBLOCK(mp,s)	\
-	(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
-#define	XFS_SUMPTR(mp,bp,so)	\
-	((xfs_suminfo_t *)((bp)->b_addr + \
-		(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
-
-#define	XFS_BITTOBLOCK(mp,bi)	((bi) >> (mp)->m_blkbit_log)
-#define	XFS_BLOCKTOBIT(mp,bb)	((bb) << (mp)->m_blkbit_log)
-#define	XFS_BITTOWORD(mp,bi)	\
-	((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
-
 #define	XFS_RTMIN(a,b)	((a) < (b) ? (a) : (b))
 #define	XFS_RTMAX(a,b)	((a) > (b) ? (a) : (b))
 
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index a35781577c..137a65bda9 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -220,8 +220,10 @@ xfs_inode_from_disk(
 	 * a time before epoch is converted to a time long after epoch
 	 * on 64 bit systems.
 	 */
-	inode->i_atime = xfs_inode_from_disk_ts(from, from->di_atime);
-	inode->i_mtime = xfs_inode_from_disk_ts(from, from->di_mtime);
+	inode_set_atime_to_ts(inode,
+			      xfs_inode_from_disk_ts(from, from->di_atime));
+	inode_set_mtime_to_ts(inode,
+			      xfs_inode_from_disk_ts(from, from->di_mtime));
 	inode_set_ctime_to_ts(inode,
 			      xfs_inode_from_disk_ts(from, from->di_ctime));
 
@@ -315,8 +317,8 @@ xfs_inode_to_disk(
 	to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
 	to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
 
-	to->di_atime = xfs_inode_to_disk_ts(ip, inode->i_atime);
-	to->di_mtime = xfs_inode_to_disk_ts(ip, inode->i_mtime);
+	to->di_atime = xfs_inode_to_disk_ts(ip, inode_get_atime(inode));
+	to->di_mtime = xfs_inode_to_disk_ts(ip, inode_get_mtime(inode));
 	to->di_ctime = xfs_inode_to_disk_ts(ip, inode_get_ctime(inode));
 	to->di_nlink = cpu_to_be32(inode->i_nlink);
 	to->di_gen = cpu_to_be32(inode->i_generation);
@@ -508,6 +510,9 @@ xfs_dinode_verify(
 	if (mode && nextents + naextents > nblocks)
 		return __this_address;
 
+	if (nextents + naextents == 0 && nblocks != 0)
+		return __this_address;
+
 	if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents)
 		return __this_address;
 
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index fa180ab66b..c269d70431 100644
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -16,6 +16,7 @@
 #include "xfs_trans.h"
 #include "xfs_rtalloc.h"
 #include "xfs_error.h"
+#include "xfs_rtbitmap.h"
 
 /*
  * Realtime allocator bitmap functions shared with userspace.
@@ -46,25 +47,69 @@ const struct xfs_buf_ops xfs_rtbuf_ops = {
 	.verify_write = xfs_rtbuf_verify_write,
 };
 
+/* Release cached rt bitmap and summary buffers. */
+void
+xfs_rtbuf_cache_relse(
+	struct xfs_rtalloc_args	*args)
+{
+	if (args->rbmbp) {
+		xfs_trans_brelse(args->tp, args->rbmbp);
+		args->rbmbp = NULL;
+		args->rbmoff = NULLFILEOFF;
+	}
+	if (args->sumbp) {
+		xfs_trans_brelse(args->tp, args->sumbp);
+		args->sumbp = NULL;
+		args->sumoff = NULLFILEOFF;
+	}
+}
+
 /*
  * Get a buffer for the bitmap or summary file block specified.
  * The buffer is returned read and locked.
  */
 int
 xfs_rtbuf_get(
-	xfs_mount_t	*mp,		/* file system mount structure */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	block,		/* block number in bitmap or summary */
-	int		issum,		/* is summary not bitmap */
-	struct xfs_buf	**bpp)		/* output: buffer for the block */
+	struct xfs_rtalloc_args	*args,
+	xfs_fileoff_t		block,	/* block number in bitmap or summary */
+	int			issum)	/* is summary not bitmap */
 {
-	struct xfs_buf	*bp;		/* block buffer, result */
-	xfs_inode_t	*ip;		/* bitmap or summary inode */
-	xfs_bmbt_irec_t	map;
-	int		nmap = 1;
-	int		error;		/* error value */
+	struct xfs_mount	*mp = args->mp;
+	struct xfs_buf		**cbpp;	/* cached block buffer */
+	xfs_fileoff_t		*coffp;	/* cached block number */
+	struct xfs_buf		*bp;	/* block buffer, result */
+	struct xfs_inode	*ip;	/* bitmap or summary inode */
+	struct xfs_bmbt_irec	map;
+	enum xfs_blft		type;
+	int			nmap = 1;
+	int			error;
 
-	ip = issum ? mp->m_rsumip : mp->m_rbmip;
+	if (issum) {
+		cbpp = &args->sumbp;
+		coffp = &args->sumoff;
+		ip = mp->m_rsumip;
+		type = XFS_BLFT_RTSUMMARY_BUF;
+	} else {
+		cbpp = &args->rbmbp;
+		coffp = &args->rbmoff;
+		ip = mp->m_rbmip;
+		type = XFS_BLFT_RTBITMAP_BUF;
+	}
+
+	/*
+	 * If we have a cached buffer, and the block number matches, use that.
+	 */
+	if (*cbpp && *coffp == block)
+		return 0;
+
+	/*
+	 * Otherwise we have to have to get the buffer.  If there was an old
+	 * one, get rid of it first.
+	 */
+	if (*cbpp) {
+		xfs_trans_brelse(args->tp, *cbpp);
+		*cbpp = NULL;
+	}
 
 	error = xfs_bmapi_read(ip, block, 1, &map, &nmap, 0);
 	if (error)
@@ -74,15 +119,15 @@ xfs_rtbuf_get(
 		return -EFSCORRUPTED;
 
 	ASSERT(map.br_startblock != NULLFSBLOCK);
-	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
+	error = xfs_trans_read_buf(mp, args->tp, mp->m_ddev_targp,
 				   XFS_FSB_TO_DADDR(mp, map.br_startblock),
 				   mp->m_bsize, 0, &bp, &xfs_rtbuf_ops);
 	if (error)
 		return error;
 
-	xfs_trans_buf_set_type(tp, bp, issum ? XFS_BLFT_RTSUMMARY_BUF
-					     : XFS_BLFT_RTBITMAP_BUF);
-	*bpp = bp;
+	xfs_trans_buf_set_type(args->tp, bp, type);
+	*cbpp = bp;
+	*coffp = block;
 	return 0;
 }
 
@@ -92,47 +137,44 @@ xfs_rtbuf_get(
  */
 int
 xfs_rtfind_back(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	start,		/* starting block to look at */
-	xfs_rtblock_t	limit,		/* last block to look at */
-	xfs_rtblock_t	*rtblock)	/* out: start block found */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext to look at */
+	xfs_rtxnum_t		limit,	/* last rtext to look at */
+	xfs_rtxnum_t		*rtx)	/* out: start rtext found */
 {
-	xfs_rtword_t	*b;		/* current word in buffer */
-	int		bit;		/* bit number in the word */
-	xfs_rtblock_t	block;		/* bitmap block number */
-	struct xfs_buf	*bp;		/* buf for the block */
-	xfs_rtword_t	*bufp;		/* starting word in buffer */
-	int		error;		/* error value */
-	xfs_rtblock_t	firstbit;	/* first useful bit in the word */
-	xfs_rtblock_t	i;		/* current bit number rel. to start */
-	xfs_rtblock_t	len;		/* length of inspected area */
-	xfs_rtword_t	mask;		/* mask of relevant bits for value */
-	xfs_rtword_t	want;		/* mask for "good" values */
-	xfs_rtword_t	wdiff;		/* difference from wanted value */
-	int		word;		/* word number in the buffer */
+	struct xfs_mount	*mp = args->mp;
+	int			bit;	/* bit number in the word */
+	xfs_fileoff_t		block;	/* bitmap block number */
+	int			error;	/* error value */
+	xfs_rtxnum_t		firstbit; /* first useful bit in the word */
+	xfs_rtxnum_t		i;	/* current bit number rel. to start */
+	xfs_rtxnum_t		len;	/* length of inspected area */
+	xfs_rtword_t		mask;	/* mask of relevant bits for value */
+	xfs_rtword_t		want;	/* mask for "good" values */
+	xfs_rtword_t		wdiff;	/* difference from wanted value */
+	xfs_rtword_t		incore;
+	unsigned int		word;	/* word number in the buffer */
 
 	/*
 	 * Compute and read in starting bitmap block for starting block.
 	 */
-	block = XFS_BITTOBLOCK(mp, start);
-	error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
-	if (error) {
+	block = xfs_rtx_to_rbmblock(mp, start);
+	error = xfs_rtbitmap_read_buf(args, block);
+	if (error)
 		return error;
-	}
-	bufp = bp->b_addr;
+
 	/*
 	 * Get the first word's index & point to it.
 	 */
-	word = XFS_BITTOWORD(mp, start);
-	b = &bufp[word];
+	word = xfs_rtx_to_rbmword(mp, start);
 	bit = (int)(start & (XFS_NBWORD - 1));
 	len = start - limit + 1;
 	/*
 	 * Compute match value, based on the bit at start: if 1 (free)
 	 * then all-ones, else all-zeroes.
 	 */
-	want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
+	incore = xfs_rtbitmap_getword(args, word);
+	want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
 	/*
 	 * If the starting position is not word-aligned, deal with the
 	 * partial word.
@@ -149,13 +191,12 @@ xfs_rtfind_back(
 		 * Calculate the difference between the value there
 		 * and what we're looking for.
 		 */
-		if ((wdiff = (*b ^ want) & mask)) {
+		if ((wdiff = (incore ^ want) & mask)) {
 			/*
 			 * Different.  Mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i = bit - XFS_RTHIBIT(wdiff);
-			*rtblock = start - i + 1;
+			*rtx = start - i + 1;
 			return 0;
 		}
 		i = bit - firstbit + 1;
@@ -167,19 +208,11 @@ xfs_rtfind_back(
 			/*
 			 * If done with this block, get the previous one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, --block);
+			if (error)
 				return error;
-			}
-			bufp = bp->b_addr;
-			word = XFS_BLOCKWMASK(mp);
-			b = &bufp[word];
-		} else {
-			/*
-			 * Go on to the previous word in the buffer.
-			 */
-			b--;
+
+			word = mp->m_blockwsize - 1;
 		}
 	} else {
 		/*
@@ -195,13 +228,13 @@ xfs_rtfind_back(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = *b ^ want)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = incore ^ want)) {
 			/*
 			 * Different, mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
-			*rtblock = start - i + 1;
+			*rtx = start - i + 1;
 			return 0;
 		}
 		i += XFS_NBWORD;
@@ -213,19 +246,11 @@ xfs_rtfind_back(
 			/*
 			 * If done with this block, get the previous one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, --block);
+			if (error)
 				return error;
-			}
-			bufp = bp->b_addr;
-			word = XFS_BLOCKWMASK(mp);
-			b = &bufp[word];
-		} else {
-			/*
-			 * Go on to the previous word in the buffer.
-			 */
-			b--;
+
+			word = mp->m_blockwsize - 1;
 		}
 	}
 	/*
@@ -242,13 +267,13 @@ xfs_rtfind_back(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = (*b ^ want) & mask)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = (incore ^ want) & mask)) {
 			/*
 			 * Different, mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
-			*rtblock = start - i + 1;
+			*rtx = start - i + 1;
 			return 0;
 		} else
 			i = len;
@@ -256,8 +281,7 @@ xfs_rtfind_back(
 	/*
 	 * No match, return that we scanned the whole area.
 	 */
-	xfs_trans_brelse(tp, bp);
-	*rtblock = start - i + 1;
+	*rtx = start - i + 1;
 	return 0;
 }
 
@@ -267,47 +291,44 @@ xfs_rtfind_back(
  */
 int
 xfs_rtfind_forw(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	start,		/* starting block to look at */
-	xfs_rtblock_t	limit,		/* last block to look at */
-	xfs_rtblock_t	*rtblock)	/* out: start block found */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext to look at */
+	xfs_rtxnum_t		limit,	/* last rtext to look at */
+	xfs_rtxnum_t		*rtx)	/* out: start rtext found */
 {
-	xfs_rtword_t	*b;		/* current word in buffer */
-	int		bit;		/* bit number in the word */
-	xfs_rtblock_t	block;		/* bitmap block number */
-	struct xfs_buf	*bp;		/* buf for the block */
-	xfs_rtword_t	*bufp;		/* starting word in buffer */
-	int		error;		/* error value */
-	xfs_rtblock_t	i;		/* current bit number rel. to start */
-	xfs_rtblock_t	lastbit;	/* last useful bit in the word */
-	xfs_rtblock_t	len;		/* length of inspected area */
-	xfs_rtword_t	mask;		/* mask of relevant bits for value */
-	xfs_rtword_t	want;		/* mask for "good" values */
-	xfs_rtword_t	wdiff;		/* difference from wanted value */
-	int		word;		/* word number in the buffer */
+	struct xfs_mount	*mp = args->mp;
+	int			bit;	/* bit number in the word */
+	xfs_fileoff_t		block;	/* bitmap block number */
+	int			error;
+	xfs_rtxnum_t		i;	/* current bit number rel. to start */
+	xfs_rtxnum_t		lastbit;/* last useful bit in the word */
+	xfs_rtxnum_t		len;	/* length of inspected area */
+	xfs_rtword_t		mask;	/* mask of relevant bits for value */
+	xfs_rtword_t		want;	/* mask for "good" values */
+	xfs_rtword_t		wdiff;	/* difference from wanted value */
+	xfs_rtword_t		incore;
+	unsigned int		word;	/* word number in the buffer */
 
 	/*
 	 * Compute and read in starting bitmap block for starting block.
 	 */
-	block = XFS_BITTOBLOCK(mp, start);
-	error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
-	if (error) {
+	block = xfs_rtx_to_rbmblock(mp, start);
+	error = xfs_rtbitmap_read_buf(args, block);
+	if (error)
 		return error;
-	}
-	bufp = bp->b_addr;
+
 	/*
 	 * Get the first word's index & point to it.
 	 */
-	word = XFS_BITTOWORD(mp, start);
-	b = &bufp[word];
+	word = xfs_rtx_to_rbmword(mp, start);
 	bit = (int)(start & (XFS_NBWORD - 1));
 	len = limit - start + 1;
 	/*
 	 * Compute match value, based on the bit at start: if 1 (free)
 	 * then all-ones, else all-zeroes.
 	 */
-	want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
+	incore = xfs_rtbitmap_getword(args, word);
+	want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
 	/*
 	 * If the starting position is not word-aligned, deal with the
 	 * partial word.
@@ -323,13 +344,12 @@ xfs_rtfind_forw(
 		 * Calculate the difference between the value there
 		 * and what we're looking for.
 		 */
-		if ((wdiff = (*b ^ want) & mask)) {
+		if ((wdiff = (incore ^ want) & mask)) {
 			/*
 			 * Different.  Mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i = XFS_RTLOBIT(wdiff) - bit;
-			*rtblock = start + i - 1;
+			*rtx = start + i - 1;
 			return 0;
 		}
 		i = lastbit - bit;
@@ -337,22 +357,15 @@ xfs_rtfind_forw(
 		 * Go on to next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * If done with this block, get the previous one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			b = bufp = bp->b_addr;
+
 			word = 0;
-		} else {
-			/*
-			 * Go on to the previous word in the buffer.
-			 */
-			b++;
 		}
 	} else {
 		/*
@@ -368,13 +381,13 @@ xfs_rtfind_forw(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = *b ^ want)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = incore ^ want)) {
 			/*
 			 * Different, mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_RTLOBIT(wdiff);
-			*rtblock = start + i - 1;
+			*rtx = start + i - 1;
 			return 0;
 		}
 		i += XFS_NBWORD;
@@ -382,22 +395,15 @@ xfs_rtfind_forw(
 		 * Go on to next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * If done with this block, get the next one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			b = bufp = bp->b_addr;
+
 			word = 0;
-		} else {
-			/*
-			 * Go on to the next word in the buffer.
-			 */
-			b++;
 		}
 	}
 	/*
@@ -412,13 +418,13 @@ xfs_rtfind_forw(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = (*b ^ want) & mask)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = (incore ^ want) & mask)) {
 			/*
 			 * Different, mark where we are and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_RTLOBIT(wdiff);
-			*rtblock = start + i - 1;
+			*rtx = start + i - 1;
 			return 0;
 		} else
 			i = len;
@@ -426,11 +432,25 @@ xfs_rtfind_forw(
 	/*
 	 * No match, return that we scanned the whole area.
 	 */
-	xfs_trans_brelse(tp, bp);
-	*rtblock = start + i - 1;
+	*rtx = start + i - 1;
 	return 0;
 }
 
+/* Log rtsummary counter at @infoword. */
+static inline void
+xfs_trans_log_rtsummary(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		infoword)
+{
+	struct xfs_buf		*bp = args->sumbp;
+	size_t			first, last;
+
+	first = (void *)xfs_rsumblock_infoptr(args, infoword) - bp->b_addr;
+	last = first + sizeof(xfs_suminfo_t) - 1;
+
+	xfs_trans_log_buf(args->tp, bp, first, last);
+}
+
 /*
  * Read and/or modify the summary information for a given extent size,
  * bitmap block combination.
@@ -442,86 +462,77 @@ xfs_rtfind_forw(
  */
 int
 xfs_rtmodify_summary_int(
-	xfs_mount_t	*mp,		/* file system mount structure */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	int		log,		/* log2 of extent size */
-	xfs_rtblock_t	bbno,		/* bitmap block number */
-	int		delta,		/* change to make to summary info */
-	struct xfs_buf	**rbpp,		/* in/out: summary block buffer */
-	xfs_fsblock_t	*rsb,		/* in/out: summary block number */
-	xfs_suminfo_t	*sum)		/* out: summary info for this block */
+	struct xfs_rtalloc_args	*args,
+	int			log,	/* log2 of extent size */
+	xfs_fileoff_t		bbno,	/* bitmap block number */
+	int			delta,	/* change to make to summary info */
+	xfs_suminfo_t		*sum)	/* out: summary info for this block */
 {
-	struct xfs_buf	*bp;		/* buffer for the summary block */
-	int		error;		/* error value */
-	xfs_fsblock_t	sb;		/* summary fsblock */
-	int		so;		/* index into the summary file */
-	xfs_suminfo_t	*sp;		/* pointer to returned data */
+	struct xfs_mount	*mp = args->mp;
+	int			error;
+	xfs_fileoff_t		sb;	/* summary fsblock */
+	xfs_rtsumoff_t		so;	/* index into the summary file */
+	unsigned int		infoword;
 
 	/*
 	 * Compute entry number in the summary file.
 	 */
-	so = XFS_SUMOFFS(mp, log, bbno);
+	so = xfs_rtsumoffs(mp, log, bbno);
 	/*
 	 * Compute the block number in the summary file.
 	 */
-	sb = XFS_SUMOFFSTOBLOCK(mp, so);
-	/*
-	 * If we have an old buffer, and the block number matches, use that.
-	 */
-	if (*rbpp && *rsb == sb)
-		bp = *rbpp;
-	/*
-	 * Otherwise we have to get the buffer.
-	 */
-	else {
-		/*
-		 * If there was an old one, get rid of it first.
-		 */
-		if (*rbpp)
-			xfs_trans_brelse(tp, *rbpp);
-		error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
-		if (error) {
-			return error;
-		}
-		/*
-		 * Remember this buffer and block for the next call.
-		 */
-		*rbpp = bp;
-		*rsb = sb;
-	}
+	sb = xfs_rtsumoffs_to_block(mp, so);
+
+	error = xfs_rtsummary_read_buf(args, sb);
+	if (error)
+		return error;
+
 	/*
 	 * Point to the summary information, modify/log it, and/or copy it out.
 	 */
-	sp = XFS_SUMPTR(mp, bp, so);
+	infoword = xfs_rtsumoffs_to_infoword(mp, so);
 	if (delta) {
-		uint first = (uint)((char *)sp - (char *)bp->b_addr);
+		xfs_suminfo_t	val = xfs_suminfo_add(args, infoword, delta);
 
-		*sp += delta;
 		if (mp->m_rsum_cache) {
-			if (*sp == 0 && log == mp->m_rsum_cache[bbno])
-				mp->m_rsum_cache[bbno]++;
-			if (*sp != 0 && log < mp->m_rsum_cache[bbno])
+			if (val == 0 && log + 1 == mp->m_rsum_cache[bbno])
 				mp->m_rsum_cache[bbno] = log;
+			if (val != 0 && log >= mp->m_rsum_cache[bbno])
+				mp->m_rsum_cache[bbno] = log + 1;
 		}
-		xfs_trans_log_buf(tp, bp, first, first + sizeof(*sp) - 1);
+		xfs_trans_log_rtsummary(args, infoword);
+		if (sum)
+			*sum = val;
+	} else if (sum) {
+		*sum = xfs_suminfo_get(args, infoword);
 	}
-	if (sum)
-		*sum = *sp;
 	return 0;
 }
 
 int
 xfs_rtmodify_summary(
-	xfs_mount_t	*mp,		/* file system mount structure */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	int		log,		/* log2 of extent size */
-	xfs_rtblock_t	bbno,		/* bitmap block number */
-	int		delta,		/* change to make to summary info */
-	struct xfs_buf	**rbpp,		/* in/out: summary block buffer */
-	xfs_fsblock_t	*rsb)		/* in/out: summary block number */
+	struct xfs_rtalloc_args	*args,
+	int			log,	/* log2 of extent size */
+	xfs_fileoff_t		bbno,	/* bitmap block number */
+	int			delta)	/* in/out: summary block number */
 {
-	return xfs_rtmodify_summary_int(mp, tp, log, bbno,
-					delta, rbpp, rsb, NULL);
+	return xfs_rtmodify_summary_int(args, log, bbno, delta, NULL);
+}
+
+/* Log rtbitmap block from the word @from to the byte before @next. */
+static inline void
+xfs_trans_log_rtbitmap(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		from,
+	unsigned int		next)
+{
+	struct xfs_buf		*bp = args->rbmbp;
+	size_t			first, last;
+
+	first = (void *)xfs_rbmblock_wordptr(args, from) - bp->b_addr;
+	last = ((void *)xfs_rbmblock_wordptr(args, next) - 1) - bp->b_addr;
+
+	xfs_trans_log_buf(args->tp, bp, first, last);
 }
 
 /*
@@ -530,41 +541,37 @@ xfs_rtmodify_summary(
  */
 int
 xfs_rtmodify_range(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	start,		/* starting block to modify */
-	xfs_extlen_t	len,		/* length of extent to modify */
-	int		val)		/* 1 for free, 0 for allocated */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext to modify */
+	xfs_rtxlen_t		len,	/* length of extent to modify */
+	int			val)	/* 1 for free, 0 for allocated */
 {
-	xfs_rtword_t	*b;		/* current word in buffer */
-	int		bit;		/* bit number in the word */
-	xfs_rtblock_t	block;		/* bitmap block number */
-	struct xfs_buf	*bp;		/* buf for the block */
-	xfs_rtword_t	*bufp;		/* starting word in buffer */
-	int		error;		/* error value */
-	xfs_rtword_t	*first;		/* first used word in the buffer */
-	int		i;		/* current bit number rel. to start */
-	int		lastbit;	/* last useful bit in word */
-	xfs_rtword_t	mask;		/* mask o frelevant bits for value */
-	int		word;		/* word number in the buffer */
+	struct xfs_mount	*mp = args->mp;
+	int			bit;	/* bit number in the word */
+	xfs_fileoff_t		block;	/* bitmap block number */
+	int			error;
+	int			i;	/* current bit number rel. to start */
+	int			lastbit; /* last useful bit in word */
+	xfs_rtword_t		mask;	 /* mask of relevant bits for value */
+	xfs_rtword_t		incore;
+	unsigned int		firstword; /* first word used in the buffer */
+	unsigned int		word;	/* word number in the buffer */
 
 	/*
 	 * Compute starting bitmap block number.
 	 */
-	block = XFS_BITTOBLOCK(mp, start);
+	block = xfs_rtx_to_rbmblock(mp, start);
 	/*
 	 * Read the bitmap block, and point to its data.
 	 */
-	error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
-	if (error) {
+	error = xfs_rtbitmap_read_buf(args, block);
+	if (error)
 		return error;
-	}
-	bufp = bp->b_addr;
+
 	/*
 	 * Compute the starting word's address, and starting bit.
 	 */
-	word = XFS_BITTOWORD(mp, start);
-	first = b = &bufp[word];
+	firstword = word = xfs_rtx_to_rbmword(mp, start);
 	bit = (int)(start & (XFS_NBWORD - 1));
 	/*
 	 * 0 (allocated) => all zeroes; 1 (free) => all ones.
@@ -583,34 +590,28 @@ xfs_rtmodify_range(
 		/*
 		 * Set/clear the active bits.
 		 */
+		incore = xfs_rtbitmap_getword(args, word);
 		if (val)
-			*b |= mask;
+			incore |= mask;
 		else
-			*b &= ~mask;
+			incore &= ~mask;
+		xfs_rtbitmap_setword(args, word, incore);
 		i = lastbit - bit;
 		/*
 		 * Go on to the next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * Log the changed part of this block.
 			 * Get the next one.
 			 */
-			xfs_trans_log_buf(tp, bp,
-				(uint)((char *)first - (char *)bufp),
-				(uint)((char *)b - (char *)bufp));
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			xfs_trans_log_rtbitmap(args, firstword, word);
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			first = b = bufp = bp->b_addr;
-			word = 0;
-		} else {
-			/*
-			 * Go on to the next word in the buffer
-			 */
-			b++;
+
+			firstword = word = 0;
 		}
 	} else {
 		/*
@@ -626,31 +627,23 @@ xfs_rtmodify_range(
 		/*
 		 * Set the word value correctly.
 		 */
-		*b = val;
+		xfs_rtbitmap_setword(args, word, val);
 		i += XFS_NBWORD;
 		/*
 		 * Go on to the next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * Log the changed part of this block.
 			 * Get the next one.
 			 */
-			xfs_trans_log_buf(tp, bp,
-				(uint)((char *)first - (char *)bufp),
-				(uint)((char *)b - (char *)bufp));
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			xfs_trans_log_rtbitmap(args, firstword, word);
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			first = b = bufp = bp->b_addr;
-			word = 0;
-		} else {
-			/*
-			 * Go on to the next word in the buffer
-			 */
-			b++;
+
+			firstword = word = 0;
 		}
 	}
 	/*
@@ -665,18 +658,19 @@ xfs_rtmodify_range(
 		/*
 		 * Set/clear the active bits.
 		 */
+		incore = xfs_rtbitmap_getword(args, word);
 		if (val)
-			*b |= mask;
+			incore |= mask;
 		else
-			*b &= ~mask;
-		b++;
+			incore &= ~mask;
+		xfs_rtbitmap_setword(args, word, incore);
+		word++;
 	}
 	/*
 	 * Log any remaining changed bytes.
 	 */
-	if (b > first)
-		xfs_trans_log_buf(tp, bp, (uint)((char *)first - (char *)bufp),
-			(uint)((char *)b - (char *)bufp - 1));
+	if (word > firstword)
+		xfs_trans_log_rtbitmap(args, firstword, word);
 	return 0;
 }
 
@@ -686,23 +680,21 @@ xfs_rtmodify_range(
  */
 int
 xfs_rtfree_range(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	start,		/* starting block to free */
-	xfs_extlen_t	len,		/* length to free */
-	struct xfs_buf	**rbpp,		/* in/out: summary block buffer */
-	xfs_fsblock_t	*rsb)		/* in/out: summary block number */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext to free */
+	xfs_rtxlen_t		len)	/* in/out: summary block number */
 {
-	xfs_rtblock_t	end;		/* end of the freed extent */
-	int		error;		/* error value */
-	xfs_rtblock_t	postblock;	/* first block freed > end */
-	xfs_rtblock_t	preblock;	/* first block freed < start */
+	struct xfs_mount	*mp = args->mp;
+	xfs_rtxnum_t		end;	/* end of the freed extent */
+	int			error;	/* error value */
+	xfs_rtxnum_t		postblock; /* first rtext freed > end */
+	xfs_rtxnum_t		preblock;  /* first rtext freed < start */
 
 	end = start + len - 1;
 	/*
 	 * Modify the bitmap to mark this extent freed.
 	 */
-	error = xfs_rtmodify_range(mp, tp, start, len, 1);
+	error = xfs_rtmodify_range(args, start, len, 1);
 	if (error) {
 		return error;
 	}
@@ -711,15 +703,15 @@ xfs_rtfree_range(
 	 * We need to find the beginning and end of the extent so we can
 	 * properly update the summary.
 	 */
-	error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
+	error = xfs_rtfind_back(args, start, 0, &preblock);
 	if (error) {
 		return error;
 	}
 	/*
 	 * Find the next allocated block (end of allocated extent).
 	 */
-	error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
-		&postblock);
+	error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1,
+			&postblock);
 	if (error)
 		return error;
 	/*
@@ -727,9 +719,9 @@ xfs_rtfree_range(
 	 * old extent, add summary data for them to be allocated.
 	 */
 	if (preblock < start) {
-		error = xfs_rtmodify_summary(mp, tp,
-			XFS_RTBLOCKLOG(start - preblock),
-			XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
+		error = xfs_rtmodify_summary(args,
+				XFS_RTBLOCKLOG(start - preblock),
+				xfs_rtx_to_rbmblock(mp, preblock), -1);
 		if (error) {
 			return error;
 		}
@@ -739,9 +731,9 @@ xfs_rtfree_range(
 	 * old extent, add summary data for them to be allocated.
 	 */
 	if (postblock > end) {
-		error = xfs_rtmodify_summary(mp, tp,
-			XFS_RTBLOCKLOG(postblock - end),
-			XFS_BITTOBLOCK(mp, end + 1), -1, rbpp, rsb);
+		error = xfs_rtmodify_summary(args,
+				XFS_RTBLOCKLOG(postblock - end),
+				xfs_rtx_to_rbmblock(mp, end + 1), -1);
 		if (error) {
 			return error;
 		}
@@ -750,10 +742,9 @@ xfs_rtfree_range(
 	 * Increment the summary information corresponding to the entire
 	 * (new) free extent.
 	 */
-	error = xfs_rtmodify_summary(mp, tp,
-		XFS_RTBLOCKLOG(postblock + 1 - preblock),
-		XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
-	return error;
+	return xfs_rtmodify_summary(args,
+			XFS_RTBLOCKLOG(postblock + 1 - preblock),
+			xfs_rtx_to_rbmblock(mp, preblock), 1);
 }
 
 /*
@@ -762,43 +753,39 @@ xfs_rtfree_range(
  */
 int
 xfs_rtcheck_range(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	start,		/* starting block number of extent */
-	xfs_extlen_t	len,		/* length of extent */
-	int		val,		/* 1 for free, 0 for allocated */
-	xfs_rtblock_t	*new,		/* out: first block not matching */
-	int		*stat)		/* out: 1 for matches, 0 for not */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext number of extent */
+	xfs_rtxlen_t		len,	/* length of extent */
+	int			val,	/* 1 for free, 0 for allocated */
+	xfs_rtxnum_t		*new,	/* out: first rtext not matching */
+	int			*stat)	/* out: 1 for matches, 0 for not */
 {
-	xfs_rtword_t	*b;		/* current word in buffer */
-	int		bit;		/* bit number in the word */
-	xfs_rtblock_t	block;		/* bitmap block number */
-	struct xfs_buf	*bp;		/* buf for the block */
-	xfs_rtword_t	*bufp;		/* starting word in buffer */
-	int		error;		/* error value */
-	xfs_rtblock_t	i;		/* current bit number rel. to start */
-	xfs_rtblock_t	lastbit;	/* last useful bit in word */
-	xfs_rtword_t	mask;		/* mask of relevant bits for value */
-	xfs_rtword_t	wdiff;		/* difference from wanted value */
-	int		word;		/* word number in the buffer */
+	struct xfs_mount	*mp = args->mp;
+	int			bit;	/* bit number in the word */
+	xfs_fileoff_t		block;	/* bitmap block number */
+	int			error;
+	xfs_rtxnum_t		i;	/* current bit number rel. to start */
+	xfs_rtxnum_t		lastbit; /* last useful bit in word */
+	xfs_rtword_t		mask;	/* mask of relevant bits for value */
+	xfs_rtword_t		wdiff;	/* difference from wanted value */
+	xfs_rtword_t		incore;
+	unsigned int		word;	/* word number in the buffer */
 
 	/*
 	 * Compute starting bitmap block number
 	 */
-	block = XFS_BITTOBLOCK(mp, start);
+	block = xfs_rtx_to_rbmblock(mp, start);
 	/*
 	 * Read the bitmap block.
 	 */
-	error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
-	if (error) {
+	error = xfs_rtbitmap_read_buf(args, block);
+	if (error)
 		return error;
-	}
-	bufp = bp->b_addr;
+
 	/*
 	 * Compute the starting word's address, and starting bit.
 	 */
-	word = XFS_BITTOWORD(mp, start);
-	b = &bufp[word];
+	word = xfs_rtx_to_rbmword(mp, start);
 	bit = (int)(start & (XFS_NBWORD - 1));
 	/*
 	 * 0 (allocated) => all zero's; 1 (free) => all one's.
@@ -820,11 +807,11 @@ xfs_rtcheck_range(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = (*b ^ val) & mask)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = (incore ^ val) & mask)) {
 			/*
 			 * Different, compute first wrong bit and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i = XFS_RTLOBIT(wdiff) - bit;
 			*new = start + i;
 			*stat = 0;
@@ -835,22 +822,15 @@ xfs_rtcheck_range(
 		 * Go on to next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * If done with this block, get the next one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			b = bufp = bp->b_addr;
+
 			word = 0;
-		} else {
-			/*
-			 * Go on to the next word in the buffer.
-			 */
-			b++;
 		}
 	} else {
 		/*
@@ -866,11 +846,11 @@ xfs_rtcheck_range(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = *b ^ val)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = incore ^ val)) {
 			/*
 			 * Different, compute first wrong bit and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_RTLOBIT(wdiff);
 			*new = start + i;
 			*stat = 0;
@@ -881,22 +861,15 @@ xfs_rtcheck_range(
 		 * Go on to next block if that's where the next word is
 		 * and we need the next word.
 		 */
-		if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+		if (++word == mp->m_blockwsize && i < len) {
 			/*
 			 * If done with this block, get the next one.
 			 */
-			xfs_trans_brelse(tp, bp);
-			error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
-			if (error) {
+			error = xfs_rtbitmap_read_buf(args, ++block);
+			if (error)
 				return error;
-			}
-			b = bufp = bp->b_addr;
+
 			word = 0;
-		} else {
-			/*
-			 * Go on to the next word in the buffer.
-			 */
-			b++;
 		}
 	}
 	/*
@@ -911,11 +884,11 @@ xfs_rtcheck_range(
 		/*
 		 * Compute difference between actual and desired value.
 		 */
-		if ((wdiff = (*b ^ val) & mask)) {
+		incore = xfs_rtbitmap_getword(args, word);
+		if ((wdiff = (incore ^ val) & mask)) {
 			/*
 			 * Different, compute first wrong bit and return.
 			 */
-			xfs_trans_brelse(tp, bp);
 			i += XFS_RTLOBIT(wdiff);
 			*new = start + i;
 			*stat = 0;
@@ -926,7 +899,6 @@ xfs_rtcheck_range(
 	/*
 	 * Successful, return.
 	 */
-	xfs_trans_brelse(tp, bp);
 	*new = start + i;
 	*stat = 1;
 	return 0;
@@ -936,57 +908,57 @@ xfs_rtcheck_range(
 /*
  * Check that the given extent (block range) is allocated already.
  */
-STATIC int				/* error */
+STATIC int
 xfs_rtcheck_alloc_range(
-	xfs_mount_t	*mp,		/* file system mount point */
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	bno,		/* starting block number of extent */
-	xfs_extlen_t	len)		/* length of extent */
+	struct xfs_rtalloc_args	*args,
+	xfs_rtxnum_t		start,	/* starting rtext number of extent */
+	xfs_rtxlen_t		len)	/* length of extent */
 {
-	xfs_rtblock_t	new;		/* dummy for xfs_rtcheck_range */
-	int		stat;
-	int		error;
+	xfs_rtxnum_t		new;	/* dummy for xfs_rtcheck_range */
+	int			stat;
+	int			error;
 
-	error = xfs_rtcheck_range(mp, tp, bno, len, 0, &new, &stat);
+	error = xfs_rtcheck_range(args, start, len, 0, &new, &stat);
 	if (error)
 		return error;
 	ASSERT(stat);
 	return 0;
 }
 #else
-#define xfs_rtcheck_alloc_range(m,t,b,l)	(0)
+#define xfs_rtcheck_alloc_range(a,b,l)	(0)
 #endif
 /*
  * Free an extent in the realtime subvolume.  Length is expressed in
  * realtime extents, as is the block number.
  */
-int					/* error */
+int
 xfs_rtfree_extent(
-	xfs_trans_t	*tp,		/* transaction pointer */
-	xfs_rtblock_t	bno,		/* starting block number to free */
-	xfs_extlen_t	len)		/* length of extent freed */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_rtxnum_t		start,	/* starting rtext number to free */
+	xfs_rtxlen_t		len)	/* length of extent freed */
 {
-	int		error;		/* error value */
-	xfs_mount_t	*mp;		/* file system mount structure */
-	xfs_fsblock_t	sb;		/* summary file block number */
-	struct xfs_buf	*sumbp = NULL;	/* summary file block buffer */
-
-	mp = tp->t_mountp;
+	struct xfs_mount	*mp = tp->t_mountp;
+	struct xfs_rtalloc_args	args = {
+		.mp		= mp,
+		.tp		= tp,
+	};
+	int			error;
+	struct timespec64	atime;
 
 	ASSERT(mp->m_rbmip->i_itemp != NULL);
 	ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
 
-	error = xfs_rtcheck_alloc_range(mp, tp, bno, len);
+	error = xfs_rtcheck_alloc_range(&args, start, len);
 	if (error)
 		return error;
 
 	/*
 	 * Free the range of realtime blocks.
 	 */
-	error = xfs_rtfree_range(mp, tp, bno, len, &sumbp, &sb);
-	if (error) {
-		return error;
-	}
+	error = xfs_rtfree_range(&args, start, len);
+	if (error)
+		goto out;
+
 	/*
 	 * Mark more blocks free in the superblock.
 	 */
@@ -999,10 +971,49 @@ xfs_rtfree_extent(
 	    mp->m_sb.sb_rextents) {
 		if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM))
 			mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
-		*(uint64_t *)&VFS_I(mp->m_rbmip)->i_atime = 0;
+
+		atime = inode_get_atime(VFS_I(mp->m_rbmip));
+		atime.tv_sec = 0;
+		inode_set_atime_to_ts(VFS_I(mp->m_rbmip), atime);
 		xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
 	}
-	return 0;
+	error = 0;
+out:
+	xfs_rtbuf_cache_relse(&args);
+	return error;
+}
+
+/*
+ * Free some blocks in the realtime subvolume.  rtbno and rtlen are in units of
+ * rt blocks, not rt extents; must be aligned to the rt extent size; and rtlen
+ * cannot exceed XFS_MAX_BMBT_EXTLEN.
+ */
+int
+xfs_rtfree_blocks(
+	struct xfs_trans	*tp,
+	xfs_fsblock_t		rtbno,
+	xfs_filblks_t		rtlen)
+{
+	struct xfs_mount	*mp = tp->t_mountp;
+	xfs_rtxnum_t		start;
+	xfs_filblks_t		len;
+	xfs_extlen_t		mod;
+
+	ASSERT(rtlen <= XFS_MAX_BMBT_EXTLEN);
+
+	len = xfs_rtb_to_rtxrem(mp, rtlen, &mod);
+	if (mod) {
+		ASSERT(mod == 0);
+		return -EIO;
+	}
+
+	start = xfs_rtb_to_rtxrem(mp, rtbno, &mod);
+	if (mod) {
+		ASSERT(mod == 0);
+		return -EIO;
+	}
+
+	return xfs_rtfree_extent(tp, start, len);
 }
 
 /* Find all the free records within a given range. */
@@ -1015,10 +1026,14 @@ xfs_rtalloc_query_range(
 	xfs_rtalloc_query_range_fn	fn,
 	void				*priv)
 {
+	struct xfs_rtalloc_args		args = {
+		.mp			= mp,
+		.tp			= tp,
+	};
 	struct xfs_rtalloc_rec		rec;
-	xfs_rtblock_t			rtstart;
-	xfs_rtblock_t			rtend;
-	xfs_rtblock_t			high_key;
+	xfs_rtxnum_t			rtstart;
+	xfs_rtxnum_t			rtend;
+	xfs_rtxnum_t			high_key;
 	int				is_free;
 	int				error = 0;
 
@@ -1034,13 +1049,13 @@ xfs_rtalloc_query_range(
 	rtstart = low_rec->ar_startext;
 	while (rtstart <= high_key) {
 		/* Is the first block free? */
-		error = xfs_rtcheck_range(mp, tp, rtstart, 1, 1, &rtend,
+		error = xfs_rtcheck_range(&args, rtstart, 1, 1, &rtend,
 				&is_free);
 		if (error)
 			break;
 
 		/* How long does the extent go for? */
-		error = xfs_rtfind_forw(mp, tp, rtstart, high_key, &rtend);
+		error = xfs_rtfind_forw(&args, rtstart, high_key, &rtend);
 		if (error)
 			break;
 
@@ -1056,6 +1071,7 @@ xfs_rtalloc_query_range(
 		rtstart = rtend + 1;
 	}
 
+	xfs_rtbuf_cache_relse(&args);
 	return error;
 }
 
@@ -1081,18 +1097,79 @@ int
 xfs_rtalloc_extent_is_free(
 	struct xfs_mount		*mp,
 	struct xfs_trans		*tp,
-	xfs_rtblock_t			start,
-	xfs_extlen_t			len,
+	xfs_rtxnum_t			start,
+	xfs_rtxlen_t			len,
 	bool				*is_free)
 {
-	xfs_rtblock_t			end;
+	struct xfs_rtalloc_args		args = {
+		.mp			= mp,
+		.tp			= tp,
+	};
+	xfs_rtxnum_t			end;
 	int				matches;
 	int				error;
 
-	error = xfs_rtcheck_range(mp, tp, start, len, 1, &end, &matches);
+	error = xfs_rtcheck_range(&args, start, len, 1, &end, &matches);
+	xfs_rtbuf_cache_relse(&args);
 	if (error)
 		return error;
 
 	*is_free = matches;
 	return 0;
 }
+
+/*
+ * Compute the number of rtbitmap blocks needed to track the given number of rt
+ * extents.
+ */
+xfs_filblks_t
+xfs_rtbitmap_blockcount(
+	struct xfs_mount	*mp,
+	xfs_rtbxlen_t		rtextents)
+{
+	return howmany_64(rtextents, NBBY * mp->m_sb.sb_blocksize);
+}
+
+/*
+ * Compute the number of rtbitmap words needed to populate every block of a
+ * bitmap that is large enough to track the given number of rt extents.
+ */
+unsigned long long
+xfs_rtbitmap_wordcount(
+	struct xfs_mount	*mp,
+	xfs_rtbxlen_t		rtextents)
+{
+	xfs_filblks_t		blocks;
+
+	blocks = xfs_rtbitmap_blockcount(mp, rtextents);
+	return XFS_FSB_TO_B(mp, blocks) >> XFS_WORDLOG;
+}
+
+/* Compute the number of rtsummary blocks needed to track the given rt space. */
+xfs_filblks_t
+xfs_rtsummary_blockcount(
+	struct xfs_mount	*mp,
+	unsigned int		rsumlevels,
+	xfs_extlen_t		rbmblocks)
+{
+	unsigned long long	rsumwords;
+
+	rsumwords = (unsigned long long)rsumlevels * rbmblocks;
+	return XFS_B_TO_FSB(mp, rsumwords << XFS_WORDLOG);
+}
+
+/*
+ * Compute the number of rtsummary info words needed to populate every block of
+ * a summary file that is large enough to track the given rt space.
+ */
+unsigned long long
+xfs_rtsummary_wordcount(
+	struct xfs_mount	*mp,
+	unsigned int		rsumlevels,
+	xfs_extlen_t		rbmblocks)
+{
+	xfs_filblks_t		blocks;
+
+	blocks = xfs_rtsummary_blockcount(mp, rsumlevels, rbmblocks);
+	return XFS_FSB_TO_B(mp, blocks) >> XFS_WORDLOG;
+}
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.h b/fs/xfs/libxfs/xfs_rtbitmap.h
new file mode 100644
index 0000000000..c0637057d6
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_rtbitmap.h
@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_RTBITMAP_H__
+#define	__XFS_RTBITMAP_H__
+
+struct xfs_rtalloc_args {
+	struct xfs_mount	*mp;
+	struct xfs_trans	*tp;
+
+	struct xfs_buf		*rbmbp;	/* bitmap block buffer */
+	struct xfs_buf		*sumbp;	/* summary block buffer */
+
+	xfs_fileoff_t		rbmoff;	/* bitmap block number */
+	xfs_fileoff_t		sumoff;	/* summary block number */
+};
+
+static inline xfs_rtblock_t
+xfs_rtx_to_rtb(
+	struct xfs_mount	*mp,
+	xfs_rtxnum_t		rtx)
+{
+	if (mp->m_rtxblklog >= 0)
+		return rtx << mp->m_rtxblklog;
+
+	return rtx * mp->m_sb.sb_rextsize;
+}
+
+static inline xfs_extlen_t
+xfs_rtxlen_to_extlen(
+	struct xfs_mount	*mp,
+	xfs_rtxlen_t		rtxlen)
+{
+	if (mp->m_rtxblklog >= 0)
+		return rtxlen << mp->m_rtxblklog;
+
+	return rtxlen * mp->m_sb.sb_rextsize;
+}
+
+/* Compute the misalignment between an extent length and a realtime extent .*/
+static inline unsigned int
+xfs_extlen_to_rtxmod(
+	struct xfs_mount	*mp,
+	xfs_extlen_t		len)
+{
+	if (mp->m_rtxblklog >= 0)
+		return len & mp->m_rtxblkmask;
+
+	return len % mp->m_sb.sb_rextsize;
+}
+
+static inline xfs_rtxlen_t
+xfs_extlen_to_rtxlen(
+	struct xfs_mount	*mp,
+	xfs_extlen_t		len)
+{
+	if (mp->m_rtxblklog >= 0)
+		return len >> mp->m_rtxblklog;
+
+	return len / mp->m_sb.sb_rextsize;
+}
+
+/* Convert an rt block number into an rt extent number. */
+static inline xfs_rtxnum_t
+xfs_rtb_to_rtx(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	if (likely(mp->m_rtxblklog >= 0))
+		return rtbno >> mp->m_rtxblklog;
+
+	return div_u64(rtbno, mp->m_sb.sb_rextsize);
+}
+
+/* Return the offset of an rt block number within an rt extent. */
+static inline xfs_extlen_t
+xfs_rtb_to_rtxoff(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	if (likely(mp->m_rtxblklog >= 0))
+		return rtbno & mp->m_rtxblkmask;
+
+	return do_div(rtbno, mp->m_sb.sb_rextsize);
+}
+
+/*
+ * Crack an rt block number into an rt extent number and an offset within that
+ * rt extent.  Returns the rt extent number directly and the offset in @off.
+ */
+static inline xfs_rtxnum_t
+xfs_rtb_to_rtxrem(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno,
+	xfs_extlen_t		*off)
+{
+	if (likely(mp->m_rtxblklog >= 0)) {
+		*off = rtbno & mp->m_rtxblkmask;
+		return rtbno >> mp->m_rtxblklog;
+	}
+
+	return div_u64_rem(rtbno, mp->m_sb.sb_rextsize, off);
+}
+
+/*
+ * Convert an rt block number into an rt extent number, rounding up to the next
+ * rt extent if the rt block is not aligned to an rt extent boundary.
+ */
+static inline xfs_rtxnum_t
+xfs_rtb_to_rtxup(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	if (likely(mp->m_rtxblklog >= 0)) {
+		if (rtbno & mp->m_rtxblkmask)
+			return (rtbno >> mp->m_rtxblklog) + 1;
+		return rtbno >> mp->m_rtxblklog;
+	}
+
+	if (do_div(rtbno, mp->m_sb.sb_rextsize))
+		rtbno++;
+	return rtbno;
+}
+
+/* Round this rtblock up to the nearest rt extent size. */
+static inline xfs_rtblock_t
+xfs_rtb_roundup_rtx(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	return roundup_64(rtbno, mp->m_sb.sb_rextsize);
+}
+
+/* Round this rtblock down to the nearest rt extent size. */
+static inline xfs_rtblock_t
+xfs_rtb_rounddown_rtx(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	return rounddown_64(rtbno, mp->m_sb.sb_rextsize);
+}
+
+/* Convert an rt extent number to a file block offset in the rt bitmap file. */
+static inline xfs_fileoff_t
+xfs_rtx_to_rbmblock(
+	struct xfs_mount	*mp,
+	xfs_rtxnum_t		rtx)
+{
+	return rtx >> mp->m_blkbit_log;
+}
+
+/* Convert an rt extent number to a word offset within an rt bitmap block. */
+static inline unsigned int
+xfs_rtx_to_rbmword(
+	struct xfs_mount	*mp,
+	xfs_rtxnum_t		rtx)
+{
+	return (rtx >> XFS_NBWORDLOG) & (mp->m_blockwsize - 1);
+}
+
+/* Convert a file block offset in the rt bitmap file to an rt extent number. */
+static inline xfs_rtxnum_t
+xfs_rbmblock_to_rtx(
+	struct xfs_mount	*mp,
+	xfs_fileoff_t		rbmoff)
+{
+	return rbmoff << mp->m_blkbit_log;
+}
+
+/* Return a pointer to a bitmap word within a rt bitmap block. */
+static inline union xfs_rtword_raw *
+xfs_rbmblock_wordptr(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index)
+{
+	union xfs_rtword_raw	*words = args->rbmbp->b_addr;
+
+	return words + index;
+}
+
+/* Convert an ondisk bitmap word to its incore representation. */
+static inline xfs_rtword_t
+xfs_rtbitmap_getword(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index)
+{
+	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);
+
+	return word->old;
+}
+
+/* Set an ondisk bitmap word from an incore representation. */
+static inline void
+xfs_rtbitmap_setword(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index,
+	xfs_rtword_t		value)
+{
+	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);
+
+	word->old = value;
+}
+
+/*
+ * Convert a rt extent length and rt bitmap block number to a xfs_suminfo_t
+ * offset within the rt summary file.
+ */
+static inline xfs_rtsumoff_t
+xfs_rtsumoffs(
+	struct xfs_mount	*mp,
+	int			log2_len,
+	xfs_fileoff_t		rbmoff)
+{
+	return log2_len * mp->m_sb.sb_rbmblocks + rbmoff;
+}
+
+/*
+ * Convert an xfs_suminfo_t offset to a file block offset within the rt summary
+ * file.
+ */
+static inline xfs_fileoff_t
+xfs_rtsumoffs_to_block(
+	struct xfs_mount	*mp,
+	xfs_rtsumoff_t		rsumoff)
+{
+	return XFS_B_TO_FSBT(mp, rsumoff * sizeof(xfs_suminfo_t));
+}
+
+/*
+ * Convert an xfs_suminfo_t offset to an info word offset within an rt summary
+ * block.
+ */
+static inline unsigned int
+xfs_rtsumoffs_to_infoword(
+	struct xfs_mount	*mp,
+	xfs_rtsumoff_t		rsumoff)
+{
+	unsigned int		mask = mp->m_blockmask >> XFS_SUMINFOLOG;
+
+	return rsumoff & mask;
+}
+
+/* Return a pointer to a summary info word within a rt summary block. */
+static inline union xfs_suminfo_raw *
+xfs_rsumblock_infoptr(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index)
+{
+	union xfs_suminfo_raw	*info = args->sumbp->b_addr;
+
+	return info + index;
+}
+
+/* Get the current value of a summary counter. */
+static inline xfs_suminfo_t
+xfs_suminfo_get(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index)
+{
+	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);
+
+	return info->old;
+}
+
+/* Add to the current value of a summary counter and return the new value. */
+static inline xfs_suminfo_t
+xfs_suminfo_add(
+	struct xfs_rtalloc_args	*args,
+	unsigned int		index,
+	int			delta)
+{
+	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);
+
+	info->old += delta;
+	return info->old;
+}
+
+/*
+ * Functions for walking free space rtextents in the realtime bitmap.
+ */
+struct xfs_rtalloc_rec {
+	xfs_rtxnum_t		ar_startext;
+	xfs_rtbxlen_t		ar_extcount;
+};
+
+typedef int (*xfs_rtalloc_query_range_fn)(
+	struct xfs_mount		*mp,
+	struct xfs_trans		*tp,
+	const struct xfs_rtalloc_rec	*rec,
+	void				*priv);
+
+#ifdef CONFIG_XFS_RT
+void xfs_rtbuf_cache_relse(struct xfs_rtalloc_args *args);
+
+int xfs_rtbuf_get(struct xfs_rtalloc_args *args, xfs_fileoff_t block,
+		int issum);
+
+static inline int
+xfs_rtbitmap_read_buf(
+	struct xfs_rtalloc_args		*args,
+	xfs_fileoff_t			block)
+{
+	return xfs_rtbuf_get(args, block, 0);
+}
+
+static inline int
+xfs_rtsummary_read_buf(
+	struct xfs_rtalloc_args		*args,
+	xfs_fileoff_t			block)
+{
+	return xfs_rtbuf_get(args, block, 1);
+}
+
+int xfs_rtcheck_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
+		xfs_rtxlen_t len, int val, xfs_rtxnum_t *new, int *stat);
+int xfs_rtfind_back(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
+		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
+int xfs_rtfind_forw(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
+		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
+int xfs_rtmodify_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
+		xfs_rtxlen_t len, int val);
+int xfs_rtmodify_summary_int(struct xfs_rtalloc_args *args, int log,
+		xfs_fileoff_t bbno, int delta, xfs_suminfo_t *sum);
+int xfs_rtmodify_summary(struct xfs_rtalloc_args *args, int log,
+		xfs_fileoff_t bbno, int delta);
+int xfs_rtfree_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
+		xfs_rtxlen_t len);
+int xfs_rtalloc_query_range(struct xfs_mount *mp, struct xfs_trans *tp,
+		const struct xfs_rtalloc_rec *low_rec,
+		const struct xfs_rtalloc_rec *high_rec,
+		xfs_rtalloc_query_range_fn fn, void *priv);
+int xfs_rtalloc_query_all(struct xfs_mount *mp, struct xfs_trans *tp,
+			  xfs_rtalloc_query_range_fn fn,
+			  void *priv);
+int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
+			       xfs_rtxnum_t start, xfs_rtxlen_t len,
+			       bool *is_free);
+/*
+ * Free an extent in the realtime subvolume.  Length is expressed in
+ * realtime extents, as is the block number.
+ */
+int					/* error */
+xfs_rtfree_extent(
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_rtxnum_t		start,	/* starting rtext number to free */
+	xfs_rtxlen_t		len);	/* length of extent freed */
+
+/* Same as above, but in units of rt blocks. */
+int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
+		xfs_filblks_t rtlen);
+
+xfs_filblks_t xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t
+		rtextents);
+unsigned long long xfs_rtbitmap_wordcount(struct xfs_mount *mp,
+		xfs_rtbxlen_t rtextents);
+
+xfs_filblks_t xfs_rtsummary_blockcount(struct xfs_mount *mp,
+		unsigned int rsumlevels, xfs_extlen_t rbmblocks);
+unsigned long long xfs_rtsummary_wordcount(struct xfs_mount *mp,
+		unsigned int rsumlevels, xfs_extlen_t rbmblocks);
+#else /* CONFIG_XFS_RT */
+# define xfs_rtfree_extent(t,b,l)			(-ENOSYS)
+# define xfs_rtfree_blocks(t,rb,rl)			(-ENOSYS)
+# define xfs_rtalloc_query_range(m,t,l,h,f,p)		(-ENOSYS)
+# define xfs_rtalloc_query_all(m,t,f,p)			(-ENOSYS)
+# define xfs_rtbitmap_read_buf(a,b)			(-ENOSYS)
+# define xfs_rtsummary_read_buf(a,b)			(-ENOSYS)
+# define xfs_rtbuf_cache_relse(a)			(0)
+# define xfs_rtalloc_extent_is_free(m,t,s,l,i)		(-ENOSYS)
+static inline xfs_filblks_t
+xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t rtextents)
+{
+	/* shut up gcc */
+	return 0;
+}
+# define xfs_rtbitmap_wordcount(mp, r)			(0)
+# define xfs_rtsummary_blockcount(mp, l, b)		(0)
+# define xfs_rtsummary_wordcount(mp, l, b)		(0)
+#endif /* CONFIG_XFS_RT */
+
+#endif /* __XFS_RTBITMAP_H__ */
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 6264daaab3..1f74d0cd16 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -975,6 +975,8 @@ xfs_sb_mount_common(
 	mp->m_blockmask = sbp->sb_blocksize - 1;
 	mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
 	mp->m_blockwmask = mp->m_blockwsize - 1;
+	mp->m_rtxblklog = log2_if_power2(sbp->sb_rextsize);
+	mp->m_rtxblkmask = mask64_if_power2(sbp->sb_rextsize);
 
 	mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
 	mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
diff --git a/fs/xfs/libxfs/xfs_sb.h b/fs/xfs/libxfs/xfs_sb.h
index a5e14740ec..19134b23c1 100644
--- a/fs/xfs/libxfs/xfs_sb.h
+++ b/fs/xfs/libxfs/xfs_sb.h
@@ -25,7 +25,7 @@ extern uint64_t	xfs_sb_version_to_features(struct xfs_sb *sbp);
 
 extern int	xfs_update_secondary_sbs(struct xfs_mount *mp);
 
-#define XFS_FS_GEOM_MAX_STRUCT_VER	(4)
+#define XFS_FS_GEOM_MAX_STRUCT_VER	(5)
 extern void	xfs_fs_geometry(struct xfs_mount *mp, struct xfs_fsop_geom *geo,
 				int struct_version);
 extern int	xfs_sb_read_secondary(struct xfs_mount *mp,
diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c
index 6b2296ff24..70e97ea6ee 100644
--- a/fs/xfs/libxfs/xfs_trans_inode.c
+++ b/fs/xfs/libxfs/xfs_trans_inode.c
@@ -65,7 +65,7 @@ xfs_trans_ichgtime(
 	tv = current_time(inode);
 
 	if (flags & XFS_ICHGTIME_MOD)
-		inode->i_mtime = tv;
+		inode_set_mtime_to_ts(inode, tv);
 	if (flags & XFS_ICHGTIME_CHG)
 		inode_set_ctime_to_ts(inode, tv);
 	if (flags & XFS_ICHGTIME_CREATE)
diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c
index 5b2f27cbdb..6cd45e8c11 100644
--- a/fs/xfs/libxfs/xfs_trans_resv.c
+++ b/fs/xfs/libxfs/xfs_trans_resv.c
@@ -19,6 +19,7 @@
 #include "xfs_trans.h"
 #include "xfs_qm.h"
 #include "xfs_trans_space.h"
+#include "xfs_rtbitmap.h"
 
 #define _ALLOC	true
 #define _FREE	false
@@ -217,11 +218,12 @@ xfs_rtalloc_block_count(
 	struct xfs_mount	*mp,
 	unsigned int		num_ops)
 {
-	unsigned int		blksz = XFS_FSB_TO_B(mp, 1);
-	unsigned int		rtbmp_bytes;
+	unsigned int		rtbmp_blocks;
+	xfs_rtxlen_t		rtxlen;
 
-	rtbmp_bytes = (XFS_MAX_BMBT_EXTLEN / mp->m_sb.sb_rextsize) / NBBY;
-	return (howmany(rtbmp_bytes, blksz) + 1) * num_ops;
+	rtxlen = xfs_extlen_to_rtxlen(mp, XFS_MAX_BMBT_EXTLEN);
+	rtbmp_blocks = xfs_rtbitmap_blockcount(mp, rtxlen);
+	return (rtbmp_blocks + 1) * num_ops;
 }
 
 /*
diff --git a/fs/xfs/libxfs/xfs_types.c b/fs/xfs/libxfs/xfs_types.c
index 5c27659347..c299b16c93 100644
--- a/fs/xfs/libxfs/xfs_types.c
+++ b/fs/xfs/libxfs/xfs_types.c
@@ -148,10 +148,10 @@ xfs_verify_rtbno(
 
 /* Verify that a realtime device extent is fully contained inside the volume. */
 bool
-xfs_verify_rtext(
+xfs_verify_rtbext(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno,
-	xfs_rtblock_t		len)
+	xfs_filblks_t		len)
 {
 	if (rtbno + len <= rtbno)
 		return false;
diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h
index 8512200214..533200c4cc 100644
--- a/fs/xfs/libxfs/xfs_types.h
+++ b/fs/xfs/libxfs/xfs_types.h
@@ -11,6 +11,7 @@ typedef uint32_t	prid_t;		/* project ID */
 typedef uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
 typedef uint32_t	xfs_agino_t;	/* inode # within allocation grp */
 typedef uint32_t	xfs_extlen_t;	/* extent length in blocks */
+typedef uint32_t	xfs_rtxlen_t;	/* file extent length in rtextents */
 typedef uint32_t	xfs_agnumber_t;	/* allocation group number */
 typedef uint64_t	xfs_extnum_t;	/* # of extents in a file */
 typedef uint32_t	xfs_aextnum_t;	/* # extents in an attribute fork */
@@ -18,6 +19,7 @@ typedef int64_t		xfs_fsize_t;	/* bytes in a file */
 typedef uint64_t	xfs_ufsize_t;	/* unsigned bytes in a file */
 
 typedef int32_t		xfs_suminfo_t;	/* type of bitmap summary info */
+typedef uint32_t	xfs_rtsumoff_t;	/* offset of an rtsummary info word */
 typedef uint32_t	xfs_rtword_t;	/* word type for bitmap manipulations */
 
 typedef int64_t		xfs_lsn_t;	/* log sequence number */
@@ -31,6 +33,8 @@ typedef uint64_t	xfs_rfsblock_t;	/* blockno in filesystem (raw) */
 typedef uint64_t	xfs_rtblock_t;	/* extent (block) in realtime area */
 typedef uint64_t	xfs_fileoff_t;	/* block number in a file */
 typedef uint64_t	xfs_filblks_t;	/* number of blocks in a file */
+typedef uint64_t	xfs_rtxnum_t;	/* rtextent number */
+typedef uint64_t	xfs_rtbxlen_t;	/* rtbitmap extent length in rtextents */
 
 typedef int64_t		xfs_srtblock_t;	/* signed version of xfs_rtblock_t */
 
@@ -47,6 +51,7 @@ typedef void *		xfs_failaddr_t;
 #define	NULLRFSBLOCK	((xfs_rfsblock_t)-1)
 #define	NULLRTBLOCK	((xfs_rtblock_t)-1)
 #define	NULLFILEOFF	((xfs_fileoff_t)-1)
+#define	NULLRTEXTNO	((xfs_rtxnum_t)-1)
 
 #define	NULLAGBLOCK	((xfs_agblock_t)-1)
 #define	NULLAGNUMBER	((xfs_agnumber_t)-1)
@@ -145,6 +150,7 @@ typedef uint32_t	xfs_dqid_t;
  */
 #define	XFS_NBBYLOG	3		/* log2(NBBY) */
 #define	XFS_WORDLOG	2		/* log2(sizeof(xfs_rtword_t)) */
+#define	XFS_SUMINFOLOG	2		/* log2(sizeof(xfs_suminfo_t)) */
 #define	XFS_NBWORDLOG	(XFS_NBBYLOG + XFS_WORDLOG)
 #define	XFS_NBWORD	(1 << XFS_NBWORDLOG)
 #define	XFS_WORDMASK	((1 << XFS_WORDLOG) - 1)
@@ -229,8 +235,8 @@ bool xfs_verify_ino(struct xfs_mount *mp, xfs_ino_t ino);
 bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
 bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino);
 bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
-bool xfs_verify_rtext(struct xfs_mount *mp, xfs_rtblock_t rtbno,
-		xfs_rtblock_t len);
+bool xfs_verify_rtbext(struct xfs_mount *mp, xfs_rtblock_t rtbno,
+		xfs_filblks_t len);
 bool xfs_verify_icount(struct xfs_mount *mp, unsigned long long icount);
 bool xfs_verify_dablk(struct xfs_mount *mp, xfs_fileoff_t off);
 void xfs_icount_range(struct xfs_mount *mp, unsigned long long *min,