ocfs2: return -EROFS when filesystem becomes read-only

We should return -EROFS rather than other errno if filesystem becomes
read-only.

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/5B191B26.9010501@huawei.comSigned-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Acked-by: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/alloc.c

@@ -1481,19 +1481,17 @@ static int ocfs2_find_branch_target(struct ocfs2_extent_tree *et,
 
 	while(le16_to_cpu(el->l_tree_depth) > 1) {
 		if (le16_to_cpu(el->l_next_free_rec) == 0) {
-			ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+			status = ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
 					"Owner %llu has empty extent list (next_free_rec == 0)\n",
 					(unsigned long long)ocfs2_metadata_cache_owner(et->et_ci));
-			status = -EIO;
 			goto bail;
 		}
 		i = le16_to_cpu(el->l_next_free_rec) - 1;
 		blkno = le64_to_cpu(el->l_recs[i].e_blkno);
 		if (!blkno) {
-			ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+			status = ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
 					"Owner %llu has extent list where extent # %d has no physical block start\n",
 					(unsigned long long)ocfs2_metadata_cache_owner(et->et_ci), i);
-			status = -EIO;
 			goto bail;
 		}
 
@@ -3214,8 +3212,7 @@ static int ocfs2_rotate_tree_left(handle_t *handle,
 			goto rightmost_no_delete;
 
 		if (le16_to_cpu(el->l_next_free_rec) == 0) {
-			ret = -EIO;
-			ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+			ret = ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
 					"Owner %llu has empty extent block at %llu\n",
 					(unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
 					(unsigned long long)le64_to_cpu(eb->h_blkno));
@@ -4411,12 +4408,11 @@ static int ocfs2_figure_merge_contig_type(struct ocfs2_extent_tree *et,
 			    le16_to_cpu(new_el->l_count)) {
 				bh = path_leaf_bh(left_path);
 				eb = (struct ocfs2_extent_block *)bh->b_data;
-				ocfs2_error(sb,
+				status = ocfs2_error(sb,
 						"Extent block #%llu has an invalid l_next_free_rec of %d.  It should have matched the l_count of %d\n",
 						(unsigned long long)le64_to_cpu(eb->h_blkno),
 						le16_to_cpu(new_el->l_next_free_rec),
 						le16_to_cpu(new_el->l_count));
-				status = -EINVAL;
 				goto free_left_path;
 			}
 			rec = &new_el->l_recs[
@@ -4466,11 +4462,10 @@ static int ocfs2_figure_merge_contig_type(struct ocfs2_extent_tree *et,
 			if (le16_to_cpu(new_el->l_next_free_rec) <= 1) {
 				bh = path_leaf_bh(right_path);
 				eb = (struct ocfs2_extent_block *)bh->b_data;
-				ocfs2_error(sb,
+				status = ocfs2_error(sb,
 						"Extent block #%llu has an invalid l_next_free_rec of %d\n",
 						(unsigned long long)le64_to_cpu(eb->h_blkno),
 						le16_to_cpu(new_el->l_next_free_rec));
-				status = -EINVAL;
 				goto free_right_path;
 			}
 			rec = &new_el->l_recs[1];

fs/ocfs2/localalloc.c

@@ -663,11 +663,10 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 #ifdef CONFIG_OCFS2_DEBUG_FS
 	if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
 	    ocfs2_local_alloc_count_bits(alloc)) {
-		ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
+		status = ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
 				(unsigned long long)le64_to_cpu(alloc->i_blkno),
 				le32_to_cpu(alloc->id1.bitmap1.i_used),
 				ocfs2_local_alloc_count_bits(alloc));
-		status = -EIO;
 		goto bail;
 	}
 #endif

fs/ocfs2/quota_local.c

@@ -137,14 +137,13 @@ static int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 	int rc = 0;
 	struct buffer_head *tmp = *bh;
 
-	if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
-		ocfs2_error(inode->i_sb,
+	if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block)
+		return ocfs2_error(inode->i_sb,
 				"Quota file %llu is probably corrupted! Requested to read block %Lu but file has size only %Lu\n",
 				(unsigned long long)OCFS2_I(inode)->ip_blkno,
 				(unsigned long long)v_block,
 				(unsigned long long)i_size_read(inode));
-		return -EIO;
-	}
+
 	rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
 				    ocfs2_validate_quota_block);
 	if (rc)