ocfs2: do not set filesystem readonly if link down

Do not set the filesystem readonly if the storage link is down.  In this
case, metadata is not corrupted and only -EIO is returned.  And if it is
indeed corrupted metadata, it has already called ocfs2_error() in
ocfs2_validate_inode_block().
Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/aops.c

@@ -1251,7 +1251,7 @@ static int ocfs2_write_cluster(struct address_space *mapping,
 	ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
 					  NULL);
 	if (ret < 0) {
-		ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
+		mlog(ML_ERROR, "Get physical blkno failed for inode %llu, "
 			    "at logical block %llu",
 			    (unsigned long long)OCFS2_I(inode)->ip_blkno,
 			    (unsigned long long)v_blkno);

fs/ocfs2/dir.c

@@ -744,7 +744,7 @@ static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
 		if (ocfs2_read_dir_block(dir, block, &bh, 0)) {
 			/* read error, skip block & hope for the best.
 			 * ocfs2_read_dir_block() has released the bh. */
-			ocfs2_error(dir->i_sb, "reading directory %llu, "
+			mlog(ML_ERROR, "reading directory %llu, "
 				    "offset %lu\n",
 				    (unsigned long long)OCFS2_I(dir)->ip_blkno,
 				    block);