ext4: make "norecovery" an alias for "noload"

Users on the linux-ext4 list recently complained about differences
across filesystems w.r.t. how to mount without a journal replay.

In the discussion it was noted that xfs's "norecovery" option is
perhaps more descriptively accurate than "noload," so let's make
that an alias for ext4.

Also show this status in /proc/mounts
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

Documentation/filesystems/ext4.txt

@@ -153,8 +153,8 @@ journal_dev=devnum	When the external journal device's major/minor numbers
 			identified through its new major/minor numbers encoded
 			in devnum.
 
-noload			Don't load the journal on mounting.  Note that
-                     	if the filesystem was not unmounted cleanly,
+norecovery		Don't load the journal on mounting.  Note that
+noload			if the filesystem was not unmounted cleanly,
                      	skipping the journal replay will lead to the
                      	filesystem containing inconsistencies that can
                      	lead to any number of problems.

fs/ext4/super.c

@@ -902,6 +902,9 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
 	if (test_opt(sb, DISCARD))
 		seq_puts(seq, ",discard");
 
+	if (test_opt(sb, NOLOAD))
+		seq_puts(seq, ",norecovery");
+
 	ext4_show_quota_options(seq, sb);
 
 	return 0;
@@ -1108,6 +1111,7 @@ static const match_table_t tokens = {
 	{Opt_acl, "acl"},
 	{Opt_noacl, "noacl"},
 	{Opt_noload, "noload"},
+	{Opt_noload, "norecovery"},
 	{Opt_nobh, "nobh"},
 	{Opt_bh, "bh"},
 	{Opt_commit, "commit=%u"},