Hi Andrew, and similarly to hfsplus, here is v2 of the hfs patches with the
same kind of changes:
1. checkpatch.pl warnings fixed
2. removed 'cancel_delayed_work()' from 'hfs_mdb_commit()' because it is not
enough to just cancel the job, we need to set the work_queued flag to zero
as well. I could do this, but it is simpler to just remove this tiny
optimization - we do not gain much with it.
This patch-set makes hfs file-system stop using the VFS '->write_supers()'
call-back and the '->s_dirt' superblock field because I plan to remove them
once all users are gone.
Like some other similar patch-sets (affs, hfsplus, ufs, reiserfs), we switch to
a delayed job for writing out the superblock instead of using the 's_dirt'
flag. Additionally, this patch-set includes several clean-ups.
Tested using the fsstress test from the LTP project.
fs/hfs/extent.c | 2 +-
fs/hfs/hfs_fs.h | 15 +++++++----
fs/hfs/inode.c | 14 +++-------
fs/hfs/mdb.c | 13 ++++++++++
fs/hfs/super.c | 73 +++++++++++++++++++++++++++----------------------------
5 files changed, 63 insertions(+), 54 deletions(-)
Reminder
========
The 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, many file-systems do not even need this and
they do not even register the '->write_super()' method at all (e.g., btrfs).
So 'sync_supers()' mostly 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.
Overall status
==============
1. ext4: patches submitted (v7)
http://thread.gmane.org/gmane.linux.kernel/1326181/focus=33332
2. ufs: patches submitted,
https://lkml.org/lkml/2012/7/12/248
3. exofs: patch submitted,
https://lkml.org/lkml/2012/6/4/211
4. sysv: patches submitted,
http://lkml.org/lkml/2012/7/3/250
5. udf: patch sits in Jan Kara's tree:
https://lkml.org/lkml/2012/6/4/233
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs for_testing
6. affs: patches sit in Al Viro's tree:
https://lkml.org/lkml/2012/6/6/400
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs for-next
7. hfs: patches sit in Andrew Morton's tree (-mm, visible in linux-next)
8. hfsplus: patches sit in Andrew Morton's tree (-mm, visible in linux-next)
9. ext2: done, see commit f72cf5e223a28d3b3ea7dc9e40464fd534e359e8
10. vfat: done, see commit 78491189ddb6d84d4a4abae992ed891a236d0263
11. jffs2: done, see commit 208b14e507c00ff7f108e1a388dd3d8cc805a443
12. reiserfs: done, see commit 033369d1af1264abc23bea2e174aa47cdd212f6f
Thanks,
Artem.
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