GFS2: Use cached rgrp in gfs2_rlist_add()

Each block which is deallocated, requires a call to gfs2_rlist_add()
and each of those calls was calling gfs2_blk2rgrpd() in order to
figure out which rgrp the block belonged in. This can be speeded up
by making use of the rgrp cached in the inode. We also reset this
cached rgrp in case the block has changed rgrp. This should provide
a big reduction in gfs2_blk2rgrpd() calls during deallocation.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/bmap.c

@@ -724,7 +724,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 			blen++;
 		else {
 			if (bstart)
-				gfs2_rlist_add(sdp, &rlist, bstart);
+				gfs2_rlist_add(ip, &rlist, bstart);
 
 			bstart = bn;
 			blen = 1;
@@ -732,7 +732,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 	}
 
 	if (bstart)
-		gfs2_rlist_add(sdp, &rlist, bstart);
+		gfs2_rlist_add(ip, &rlist, bstart);
 	else
 		goto out; /* Nothing to do */
 

fs/gfs2/dir.c

@@ -1821,7 +1821,7 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
 		if (blk != leaf_no)
 			brelse(bh);
 
-		gfs2_rlist_add(sdp, &rlist, blk);
+		gfs2_rlist_add(dip, &rlist, blk);
 		l_blocks++;
 	}
 

fs/gfs2/rgrp.c

@@ -1560,7 +1560,7 @@ fail:
 
 /**
  * gfs2_rlist_add - add a RG to a list of RGs
- * @sdp: the filesystem
+ * @ip: the inode
  * @rlist: the list of resource groups
  * @block: the block
  *
@@ -1570,9 +1570,10 @@ fail:
  *
  */
 
-void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
+void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
 		    u64 block)
 {
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_rgrpd *rgd;
 	struct gfs2_rgrpd **tmp;
 	unsigned int new_space;
@@ -1581,12 +1582,15 @@ void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
 	if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
 		return;
 
-	rgd = gfs2_blk2rgrpd(sdp, block);
+	if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, block))
+		rgd = ip->i_rgd;
+	else
+		rgd = gfs2_blk2rgrpd(sdp, block);
 	if (!rgd) {
-		if (gfs2_consist(sdp))
-			fs_err(sdp, "block = %llu\n", (unsigned long long)block);
+		fs_err(sdp, "rlist_add: no rgrp for block %llu\n", (unsigned long long)block);
 		return;
 	}
+	ip->i_rgd = rgd;
 
 	for (x = 0; x < rlist->rl_rgrps; x++)
 		if (rlist->rl_rgd[x] == rgd)

fs/gfs2/rgrp.h

@@ -60,7 +60,7 @@ struct gfs2_rgrp_list {
 	struct gfs2_holder *rl_ghs;
 };
 
-extern void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
+extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
 			   u64 block);
 extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state);
 extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);

fs/gfs2/xattr.c

@@ -1356,14 +1356,14 @@ static int ea_dealloc_indirect(struct gfs2_inode *ip)
 			blen++;
 		else {
 			if (bstart)
-				gfs2_rlist_add(sdp, &rlist, bstart);
+				gfs2_rlist_add(ip, &rlist, bstart);
 			bstart = bn;
 			blen = 1;
 		}
 		blks++;
 	}
 	if (bstart)
-		gfs2_rlist_add(sdp, &rlist, bstart);
+		gfs2_rlist_add(ip, &rlist, bstart);
 	else
 		goto out;