[GFS2] Drop log lock on I/O error & tidy up

This patch drops the log spinlock when an I/O error occurs
to avoid any possible problems in case of blocking or
recursion in the I/O error routine. It also has a few
cosmetic changes to tidy up various other files.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/meta_io.c

@@ -226,8 +226,11 @@ void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 			gfs2_assert(sdp, bd->bd_ail == ai);
 
 			if (!buffer_busy(bh)) {
-				if (!buffer_uptodate(bh))
+				if (!buffer_uptodate(bh)) {
+					gfs2_log_unlock(sdp);
 					gfs2_io_error_bh(sdp, bh);
+					gfs2_log_lock(sdp);
+				}
 				list_move(&bd->bd_ail_st_list,
 					  &ai->ai_ail2_list);
 				continue;

fs/gfs2/ops_inode.c

@@ -213,8 +213,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 		if (error)
 			goto out_gunlock_q;
 
-		error = gfs2_trans_begin(sdp,
-					 sdp->sd_max_dirres +
+		error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 					 al->al_rgd->rd_ri.ri_length +
 					 2 * RES_DINODE + RES_STATFS +
 					 RES_QUOTA, 0);
@@ -303,7 +302,7 @@ static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 	if (error)
 		goto out_gunlock;
 
-	error = gfs2_unlinki(dip, &dentry->d_name, ip,ul);
+	error = gfs2_unlinki(dip, &dentry->d_name, ip, ul);
 
 	gfs2_trans_end(sdp);
 

fs/gfs2/page.c

@@ -155,11 +155,9 @@ int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 	if (!PageUptodate(page)) {
 		void *kaddr = kmap(page);
 
-		memcpy(kaddr,
-		       dibh->b_data + sizeof(struct gfs2_dinode),
+		memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
 		       ip->i_di.di_size);
-		memset(kaddr + ip->i_di.di_size,
-		       0,
+		memset(kaddr + ip->i_di.di_size, 0,
 		       PAGE_CACHE_SIZE - ip->i_di.di_size);
 		kunmap(page);
 

fs/gfs2/unlinked.c

@@ -130,11 +130,12 @@ static void enforce_limit(struct gfs2_sbd *sdp)
 	unsigned int tries = 0, min = 0;
 	int error;
 
-	if (atomic_read(&sdp->sd_unlinked_count) >=
-	    gfs2_tune_get(sdp, gt_ilimit)) {
-		tries = gfs2_tune_get(sdp, gt_ilimit_tries);
-		min = gfs2_tune_get(sdp, gt_ilimit_min);
-	}
+	if (atomic_read(&sdp->sd_unlinked_count) <
+	    gfs2_tune_get(sdp, gt_ilimit))
+		return;
+
+	tries = gfs2_tune_get(sdp, gt_ilimit_tries);
+	min = gfs2_tune_get(sdp, gt_ilimit_min);
 
 	while (tries--) {
 		struct gfs2_unlinked *ul = ul_fish(sdp);
@@ -187,7 +188,7 @@ int gfs2_unlinked_get(struct gfs2_sbd *sdp, struct gfs2_unlinked **ul)
 
 	goto fail;
 
- found:
+found:
 	for (b = 0; b < 8; b++)
 		if (!(byte & (1 << b)))
 			break;
@@ -202,7 +203,7 @@ int gfs2_unlinked_get(struct gfs2_sbd *sdp, struct gfs2_unlinked **ul)
 
 	return 0;
 
- fail:
+fail:
 	spin_unlock(&sdp->sd_unlinked_spin);
 	kfree(*ul);
 	return -ENOSPC;
@@ -410,7 +411,7 @@ int gfs2_unlinked_init(struct gfs2_sbd *sdp)
 
 	return 0;
 
- fail:
+fail:
 	gfs2_unlinked_cleanup(sdp);
 	return error;
 }