reiserfs: introduce reiserfs_error()

Although reiserfs can currently handle severe errors such as journal failure,
it cannot handle less severe errors like metadata i/o failure. The following
patch adds a reiserfs_error() function akin to the one in ext3.

Subsequent patches will use this new error handler to handle errors more
gracefully in general.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/reiserfs/prints.c

@@ -370,6 +370,31 @@ void __reiserfs_panic(struct super_block *sb, const char *id,
 		      id ? id : "", id ? " " : "", function, error_buf);
 }
 
+void __reiserfs_error(struct super_block *sb, const char *id,
+		      const char *function, const char *fmt, ...)
+{
+	do_reiserfs_warning(fmt);
+
+	BUG_ON(sb == NULL);
+
+	if (reiserfs_error_panic(sb))
+		__reiserfs_panic(sb, id, function, error_buf);
+
+	if (id && id[0])
+		printk(KERN_CRIT "REISERFS error (device %s): %s %s: %s\n",
+		       sb->s_id, id, function, error_buf);
+	else
+		printk(KERN_CRIT "REISERFS error (device %s): %s: %s\n",
+		       sb->s_id, function, error_buf);
+
+	if (sb->s_flags & MS_RDONLY)
+		return;
+
+	reiserfs_info(sb, "Remounting filesystem read-only\n");
+	sb->s_flags |= MS_RDONLY;
+	reiserfs_abort_journal(sb, -EIO);
+}
+
 void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...)
 {
 	do_reiserfs_warning(fmt);

include/linux/reiserfs_fs.h

@@ -2006,6 +2006,10 @@ void __reiserfs_panic(struct super_block *s, const char *id,
     __attribute__ ((noreturn));
 #define reiserfs_panic(s, id, fmt, args...) \
 	__reiserfs_panic(s, id, __func__, fmt, ##args)
+void __reiserfs_error(struct super_block *s, const char *id,
+		      const char *function, const char *fmt, ...);
+#define reiserfs_error(s, id, fmt, args...) \
+	 __reiserfs_error(s, id, __func__, fmt, ##args)
 void reiserfs_info(struct super_block *s, const char *fmt, ...);
 void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...);
 void print_indirect_item(struct buffer_head *bh, int item_num);