nilfs2: implement nilfs_show_options to display mount options in /proc/mounts

This is a patch to display mount options in procfs.
Mount options will show up in the /proc/mounts as other fs does.

...
/dev/sda6 /mnt nilfs2 ro,relatime,barrier=off,cp=3,order=strict 0 0
...

Signed-off-by: Jiro SEKIBA <jir@unicus.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 23 insertions, 1 deletions

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 151964f0de4c..ebbefb9d26c9 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -50,6 +50,8 @@
 #include <linux/writeback.h>
 #include <linux/kobject.h>
 #include <linux/exportfs.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
 #include "nilfs.h"
 #include "mdt.h"
 #include "alloc.h"
@@ -529,6 +531,26 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         return 0;
 }
 
+static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+        struct super_block *sb = vfs->mnt_sb;
+        struct nilfs_sb_info *sbi = NILFS_SB(sb);
+
+        if (!nilfs_test_opt(sbi, BARRIER))
+                seq_printf(seq, ",barrier=off");
+        if (nilfs_test_opt(sbi, SNAPSHOT))
+                seq_printf(seq, ",cp=%llu",
+                           (unsigned long long int)sbi->s_snapshot_cno);
+        if (nilfs_test_opt(sbi, ERRORS_RO))
+                seq_printf(seq, ",errors=remount-ro");
+        if (nilfs_test_opt(sbi, ERRORS_PANIC))
+                seq_printf(seq, ",errors=panic");
+        if (nilfs_test_opt(sbi, STRICT_ORDER))
+                seq_printf(seq, ",order=strict");
+
+        return 0;
+}
+
 static struct super_operations nilfs_sops = {
         .alloc_inode    = nilfs_alloc_inode,
         .destroy_inode  = nilfs_destroy_inode,
@@ -546,7 +568,7 @@ static struct super_operations nilfs_sops = {
         .remount_fs     = nilfs_remount,
         .clear_inode    = nilfs_clear_inode,
         /* .umount_begin */
-        /* .show_options */
+        .show_options = nilfs_show_options
 };
 
 static struct inode *