On Tuesday 28 December 2010 17:23:22 Paul Hartman wrote: > On Tue, Dec 28, 2010 at 7:50 AM, Mick <[email protected]> wrote: > > What is the meaning of Opts: (null) ? > > My guess is that it is showing the default mount options as stored in > the partition's superblock (set by tune2fs -o xxxxx). You can view the > current default mount options by using "tune2fs -l /dev/sda1" (or > whatever your partition is). Options given on mount commandline (or in > fstab) should override the superblock mount options. > > My dmesg shows (null) as yours does, and tune2fs shows me: > Default mount options: (none)
OK, same as mine. > > All ext4 partitions were created with a number of options; e.g. > > > > Filesystem features: has_journal ext_attr resize_inode dir_index > > filetype needs_recovery extent flex_bg sparse_super large_file uninit_bg > > dir_nlink extra_isize > > Those are characteristics of your filesystem but I don't think they > are considered mount options in this context. Yes, that's right, but they affect some mount options if the latter are explicitly set at fstab. > You can view the actual mount options currently in use by doing "cat > /proc/mounts" > > In my fstab I have "defaults,noatime" for my rootfs and in > /proc/mounts it shows as: > > /dev/root / ext4 rw,noatime,barrier=1,data=ordered 0 0 > > which looks correct to me. Same here: /dev/root / ext4 rw,noatime,barrier=1,data=ordered 0 0 Is that all that is required for ext4? Do we need to define anything else to take advantage of the various ext4 options (see below)? http://www.mjmwired.net/kernel/Documentation/filesystems/ext4.txt#125 -- Regards, Mick
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