And here is the existing discussion in btrfs mail list, just for reference:
http://thread.gmane.org/gmane.comp.file-systems.btrfs/51098
Thanks,
Qu
Qu Wenruo wrote on 2015/12/17 09:41 +0800:
Hi,
In a recent btrfs patch, it is going to add a mount option to disable
log replay for btrfs, just like "norecovery" for ext4/xfs.
But in the discussion on the mount option name and use case, it seems
better to have an unified and fs independent mount option alias for real
RO mount
Reasons:
1) Some file system may have already used [no]"recovery" mount option
In fact, btrfs has already used "recovery" mount option.
Using "norecovery" mount option will be quite confusing for btrfs.
2) More straight forward mount option
Currently, to get real RO mount, for ext4/xfs, user must use -o
ro,norecovery.
Just ro won't ensure real RO, and norecovery can't be used alone.
If we have a simple alias, it would be much better for user to use.
(it maybe done just in user space mount)
Not to mention some fs (yeah, btrfs again) doesn't have "norecovery"
but "nologreplay".
3) A lot of user even don't now mount ro can still modify device
Yes, I didn't know this point until I checked the log replay code of
btrfs.
Adding such mount option alias may raise some attention of users.
Any ideas about this?
Thanks,
Qu
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