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nilfs2: add norecovery mount option

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This adds "norecovery" mount option which disables temporal write
access to read-only mounts or snapshots during mount/recovery.
Without this option, write access will be even performed for those
types of mounts; the temporal write access is needed to mount root
file system read-only after an unclean shutdown.

This option will be helpful when user wants to prevent any write
access to the device.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Ryusuke Konishi
2009-11-20 03:28:01 +09:00
parent a057d2c011
commit 0234576d04
4 changed files with 39 additions and 3 deletions
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Documentation/filesystems/nilfs2.txt
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@ -70,6 +70,10 @@ order=strict Apply strict in-order semantics that preserves sequence
blocks. That means, it is guaranteed that no
overtaking of events occurs in the recovered file
system after a crash.
norecovery Disable recovery of the filesystem on mount.
This disables every write access on the device for
read-only mounts or snapshots. This option will fail
for r/w mounts on an unclean volume.
NILFS2 usage
============