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[PATCH 0/3] do not use s_dirt in JFFS2

 

 

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dedekind1 at gmail

May 4, 2012, 10:27 AM

Post #1 of 5 (91 views)
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[PATCH 0/3] do not use s_dirt in JFFS2

This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()'
call-back because I plan to remove it once all users are gone.

The final goal is to get rid of the 'sync_supers()' kernel thread. This kernel
thread wakes up every 5 seconds (by default) and calls '->write_super()' for
all mounted file-systems. And the bad thing is that this is done even if all
the superblocks are clean. Moreover, some file-systems do not even need this
end they do not register the '->write_super()' method at all (e.g., btrfs).

So 'sync_supers()' most often just generates useless wake-ups and wastes power.
I am trying to make all file-systems independent of '->write_super()' and plan
to remove 'sync_supers()' and '->write_super' completely once there are no more
users.

The '->write_supers()' method is mostly used by baroque file-systems like hfs,
udf, etc. Modern file-systems like btrfs and xfs do not use it. This justifies
removing this stuff from VFS completely and make every FS self-manage own
superblock.

Note: in the past I was trying to upstream patches which optimized 'sync_super()',
but Al Viro wanted me to kill it completely instead, which I am trying to do
now, see http://lkml.org/lkml/2010/7/22/96

======
Overall status:

1. ext4: patches submitted, waiting for reply from Ted Ts'o:
https://lkml.org/lkml/2012/4/2/111
Ted keeps silence so far WRT the fate of this patch-set.
2. ext2: patches are in the ext2 tree maintained by Jan Kara:
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git for_next
3. Version 3 of FAT FS changes were sent to Andrew and Hirofumi:
https://lkml.org/lkml/2012/5/4/183
4. JFFS2 patches are sent being sent now.

TODO: affs, exofs, hfs, hfsplus, reiserfs, sysv, udf, ufs
======

fs/fat/fat.h | 1 +
fs/fat/fatent.c | 22 +++++++++++++-----
fs/fat/inode.c | 54 ++++++++++++++++++++-------------------------
include/linux/msdos_fs.h | 3 +-
4 files changed, 43 insertions(+), 37 deletions(-)

Thanks,
Artem.
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dedekind1 at gmail

May 4, 2012, 10:41 AM

Post #2 of 5 (90 views)
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Re: [PATCH 0/3] do not use s_dirt in JFFS2 [In reply to]

On Fri, 2012-05-04 at 20:27 +0300, Artem Bityutskiy wrote:
> This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()'
> call-back because I plan to remove it once all users are gone.

I'd really appreciate if someone on the MTD list tested these patches.

--
Best Regards,
Artem Bityutskiy
Attachments: signature.asc (0.82 KB)


computersforpeace at gmail

May 4, 2012, 5:55 PM

Post #3 of 5 (86 views)
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Re: [PATCH 0/3] do not use s_dirt in JFFS2 [In reply to]

On Fri, May 4, 2012 at 10:41 AM, Artem Bityutskiy <dedekind1 [at] gmail> wrote:
> On Fri, 2012-05-04 at 20:27 +0300, Artem Bityutskiy wrote:
>> This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()'
>> call-back because I plan to remove it once all users are gone.
>
> I'd really appreciate if someone on the MTD list tested these patches.

Am I crazy, or did you send the cover letter without the patches?

Brian
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computersforpeace at gmail

May 4, 2012, 5:58 PM

Post #4 of 5 (88 views)
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Re: [PATCH 0/3] do not use s_dirt in JFFS2 [In reply to]

On Fri, May 4, 2012 at 5:55 PM, Brian Norris
<computersforpeace [at] gmail> wrote:
> On Fri, May 4, 2012 at 10:41 AM, Artem Bityutskiy <dedekind1 [at] gmail> wrote:
>> On Fri, 2012-05-04 at 20:27 +0300, Artem Bityutskiy wrote:
>>> This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()'
>>> call-back because I plan to remove it once all users are gone.
>>
>> I'd really appreciate if someone on the MTD list tested these patches.
>
> Am I crazy, or did you send the cover letter without the patches?

Sorry, I am at least a little crazy: I actually see two patches
(labelled 1/2 and 2/2) while the cover is labelled 0/3, with a
diffstat from FAT changes...

Brian
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dedekind1 at gmail

May 5, 2012, 2:38 AM

Post #5 of 5 (86 views)
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Re: [PATCH 0/3] do not use s_dirt in JFFS2 [In reply to]

On Fri, 2012-05-04 at 17:55 -0700, Brian Norris wrote:
> On Fri, May 4, 2012 at 10:41 AM, Artem Bityutskiy <dedekind1 [at] gmail> wrote:
> > On Fri, 2012-05-04 at 20:27 +0300, Artem Bityutskiy wrote:
> >> This patch-set makes JFFS2 file-system stop using the VFS '->write_supers()'
> >> call-back because I plan to remove it once all users are gone.
> >
> > I'd really appreciate if someone on the MTD list tested these patches.
>
> Am I crazy, or did you send the cover letter without the patches?

Yeah, sorry, I copied the cover letter from FAT FS patches and did not
clean-it up well enough. This set has only 2 patches.

--
Best Regards,
Artem Bityutskiy
Attachments: signature.asc (0.82 KB)

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