Hi all,
I'm running "fsfreeze --freeze /mnt" (/mnt is mounted with an ext2 partition)
and getting "fsfreeze: /mnt: freeze failed: Operation not supported":
the strace log shows:
open("/mnt", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
ioctl(3, FIFREEZE, 0) = -1 EOPNOTSUPP (Operation not supported)
My kernel is 3.16.2.
I know ext3/4 support fs freeze, but I'm not sure about ext2.
Though the above experiment shows it's not supported, but I do see
struct super_operations ext2_sops defines an ext2_freeze() and the
code of ioctl_fsfreeze() is:
static int ioctl_fsfreeze(struct file *filp)
{
struct super_block *sb = file_inode(filp)->i_sb;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/* If filesystem doesn't support freeze feature, return. */
if (sb->s_op->freeze_fs == NULL)
return -EOPNOTSUPP;
/* Freeze */
return freeze_super(sb);
}
It seems here sb->s_op->freeze_fs is NULL??? why?
I think I must miss something. Please point it out.
Thanks!
-- Dexuan
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