[GFS2] Kernel changes to support new gfs2_grow command (part 2)

To avoid code redundancy, I separated out the operational "guts" into
a new function called read_rindex_entry.  Then I made two functions:
the closer-to-original gfs2_ri_update (without the special condition
checks) and gfs2_ri_update_special that's designed with that condition
in mind.  (I don't like the name, but if you have a suggestion, I'm
all ears).

Oh, and there's an added benefit:  we don't need all the ugly gotos
anymore.  ;)

This patch has been tested with gfs2_fsck_hellfire (which runs for
three and a half hours, btw).
Signed-off-By: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_address.c

@@ -469,7 +469,8 @@ static void adjust_fs_space(struct inode *inode)
 	else
 		new_free = 0;
 	spin_unlock(&sdp->sd_statfs_spin);
-	fs_warn(sdp, "File system extended by %llu blocks.\n", new_free);
+	fs_warn(sdp, "File system extended by %llu blocks.\n",
+		(unsigned long long)new_free);
 	gfs2_statfs_change(sdp, new_free, new_free, 0);
 }
 

fs/gfs2/rgrp.c

@@ -463,54 +463,35 @@ u64 gfs2_ri_total(struct gfs2_sbd *sdp)
 }
 
 /**
- * gfs2_ri_update - Pull in a new resource index from the disk
+ * read_rindex_entry - Pull in a new resource index entry from the disk
  * @gl: The glock covering the rindex inode
  *
- * Returns: 0 on successful update, error code otherwise
+ * Returns: 0 on success, error code otherwise
  */
 
-static int gfs2_ri_update(struct gfs2_inode *ip)
+static int read_rindex_entry(struct gfs2_inode *ip,
+			     struct file_ra_state *ra_state)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct inode *inode = &ip->i_inode;
-	struct gfs2_rgrpd *rgd;
+	loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
 	char buf[sizeof(struct gfs2_rindex)];
-	struct file_ra_state ra_state;
-	u64 junk = ip->i_di.di_size;
 	int error;
+	struct gfs2_rgrpd *rgd;
 
-	/* If someone is holding the rindex file with a glock, they must
-	   be updating it, in which case we may have partial entries.
-	   In this case, we ignore the partials. */
-	if (!gfs2_glock_is_held_excl(ip->i_gl) &&
-	    !gfs2_glock_is_held_shrd(ip->i_gl) &&
-	    do_div(junk, sizeof(struct gfs2_rindex))) {
-		gfs2_consist_inode(ip);
-		return -EIO;
-	}
-
-	clear_rgrpdi(sdp);
-
-	file_ra_state_init(&ra_state, inode->i_mapping);
-	for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
-		loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
-
-		if (pos + sizeof(struct gfs2_rindex) >= ip->i_di.di_size)
-			break;
-		error = gfs2_internal_read(ip, &ra_state, buf, &pos,
+	error = gfs2_internal_read(ip, ra_state, buf, &pos,
 				   sizeof(struct gfs2_rindex));
 	if (!error)
-			break;
+		return 0;
 	if (error != sizeof(struct gfs2_rindex)) {
 		if (error > 0)
 			error = -EIO;
-			goto fail;
+		return error;
 	}
 
 	rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
 	error = -ENOMEM;
 	if (!rgd)
-			goto fail;
+		return error;
 
 	mutex_init(&rgd->rd_mutex);
 	lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
@@ -522,23 +503,85 @@ static int gfs2_ri_update(struct gfs2_inode *ip)
 	gfs2_rindex_in(&rgd->rd_ri, buf);
 	error = compute_bitstructs(rgd);
 	if (error)
-			goto fail;
+		return error;
 
 	error = gfs2_glock_get(sdp, rgd->rd_ri.ri_addr,
 			       &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
 	if (error)
-			goto fail;
+		return error;
 
 	rgd->rd_gl->gl_object = rgd;
 	rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
+	return error;
+}
+
+/**
+ * gfs2_ri_update - Pull in a new resource index from the disk
+ * @ip: pointer to the rindex inode
+ *
+ * Returns: 0 on successful update, error code otherwise
+ */
+
+static int gfs2_ri_update(struct gfs2_inode *ip)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	struct inode *inode = &ip->i_inode;
+	struct file_ra_state ra_state;
+	u64 junk = ip->i_di.di_size;
+	int error;
+
+	if (do_div(junk, sizeof(struct gfs2_rindex))) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+
+	clear_rgrpdi(sdp);
+
+	file_ra_state_init(&ra_state, inode->i_mapping);
+	for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
+		error = read_rindex_entry(ip, &ra_state);
+		if (error) {
+			clear_rgrpdi(sdp);
+			return error;
+		}
 	}
 
 	sdp->sd_rindex_vn = ip->i_gl->gl_vn;
 	return 0;
+}
 
-fail:
+/**
+ * gfs2_ri_update_special - Pull in a new resource index from the disk
+ *
+ * This is a special version that's safe to call from gfs2_inplace_reserve_i.
+ * In this case we know that we don't have any resource groups in memory yet.
+ *
+ * @ip: pointer to the rindex inode
+ *
+ * Returns: 0 on successful update, error code otherwise
+ */
+static int gfs2_ri_update_special(struct gfs2_inode *ip)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	struct inode *inode = &ip->i_inode;
+	struct file_ra_state ra_state;
+	int error;
+
+	file_ra_state_init(&ra_state, inode->i_mapping);
+	for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
+		/* Ignore partials */
+		if ((sdp->sd_rgrps + 1) * sizeof(struct gfs2_rindex) >
+		    ip->i_di.di_size)
+			break;
+		error = read_rindex_entry(ip, &ra_state);
+		if (error) {
 			clear_rgrpdi(sdp);
 			return error;
+		}
+	}
+
+	sdp->sd_rindex_vn = ip->i_gl->gl_vn;
+	return 0;
 }
 
 /**
@@ -1028,7 +1071,7 @@ int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
 	if (ip != GFS2_I(sdp->sd_rindex))
 		error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
 	else if (!sdp->sd_rgrps) /* We may not have the rindex read in, so: */
-		error = gfs2_ri_update(ip);
+		error = gfs2_ri_update_special(ip);
 
 	if (error)
 		return error;