nilfs2: change default of 'errors' mount option to 'remount-ro' mode

Like ext3, nilfs has 'errors' mount option to allow specifying desired
behavior on severe errors.

Currently, the default action is 'errors=continue' and has potential
to advance filesystem corruption for severe errors.

This will change the action to 'errors=remount-ro' to avoid the issue.

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

diff --git a/Documentation/filesystems/nilfs2.txt b/Documentation/filesystems/nilfs2.txt
index cf6d0d8..d3e7673 100644 (file)
--- a/Documentation/filesystems/nilfs2.txt
+++ b/Documentation/filesystems/nilfs2.txt
@@ -50,8 +50,8 @@ NILFS2 supports the following mount options:
 (*) == default
 
 nobarrier              Disables barriers.
-errors=continue(*)     Keep going on a filesystem error.
-errors=remount-ro      Remount the filesystem read-only on an error.
+errors=continue                Keep going on a filesystem error.
+errors=remount-ro(*)   Remount the filesystem read-only on an error.
 errors=panic           Panic and halt the machine if an error occurs.
 cp=n                   Specify the checkpoint-number of the snapshot to be
                        mounted.  Checkpoints and snapshots are listed by lscp

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 48145f5..0b1758b 100644 (file)
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -470,10 +470,10 @@ static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
        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, ERRORS_CONT))
+               seq_printf(seq, ",errors=continue");
        if (nilfs_test_opt(sbi, STRICT_ORDER))
                seq_printf(seq, ",order=strict");
        if (nilfs_test_opt(sbi, NORECOVERY))
@@ -631,7 +631,7 @@ nilfs_set_default_options(struct nilfs_sb_info *sbi,
                          struct nilfs_super_block *sbp)
 {
        sbi->s_mount_opt =
-               NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER;
+               NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
 }
 
 static int nilfs_setup_super(struct nilfs_sb_info *sbi)