Re: [PATCH 1/1] nilfs2: add mount option that reduces super block writes

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Hi Andreas,

On Jan 30, 2014, at 5:47 AM, Andreas Rohner wrote:

> This patch introduces a mount option bad_ftl that disables the
> periodic overwrites of the super block to make the file system better
> suitable for bad flash memory with a bad FTL. The super block is only
> written at umount time. So if there is a power outage the file system
> needs to be recovered by a linear scan of all segment summary blocks.
> 
> The linear scan is only necessary if the file system wasn't umounted
> properly. So the normal mount time is not affected.
> 
> Signed-off-by: Andreas Rohner <andreas.rohner@xxxxxxx>
> ---
> fs/nilfs2/segbuf.c        |  3 ++-
> fs/nilfs2/segment.c       |  3 ++-
> fs/nilfs2/super.c         | 10 +++++++--
> fs/nilfs2/the_nilfs.c     | 54 ++++++++++++++++++++++++++++++++++++++++++++---
> include/linux/nilfs2_fs.h |  4 +++-
> 5 files changed, 66 insertions(+), 8 deletions(-)
> 

As far as I can judge, conceptually it is simply rollback of the fix [1].

Thanks,
Vyacheslav Dubeyko.

[1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a9bae189542e71f91e61a4428adf6e5a7dfe8063

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