From: Jan Kara <jack@suse.cz>
To: Eric Biggers <ebiggers@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-xfs@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 05/13] fs: don't call ->dirty_inode for lazytime timestamp updates
Date: Thu, 7 Jan 2021 14:18:53 +0100 [thread overview]
Message-ID: <20210107131853.GA10535@quack2.suse.cz> (raw)
In-Reply-To: <20210107131753.GD12990@quack2.suse.cz>
On Thu 07-01-21 14:17:53, Jan Kara wrote:
> On Mon 04-01-21 16:54:44, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@google.com>
> >
> > There is no need to call ->dirty_inode for lazytime timestamp updates
> > (i.e. for __mark_inode_dirty(I_DIRTY_TIME)), since by the definition of
> > lazytime, filesystems must ignore these updates. Filesystems only need
> > to care about the updated timestamps when they expire.
> >
> > Therefore, only call ->dirty_inode when I_DIRTY_INODE is set.
> >
> > Based on a patch from Christoph Hellwig:
> > https://lore.kernel.org/r/20200325122825.1086872-4-hch@lst.de
> >
> > Signed-off-by: Eric Biggers <ebiggers@google.com>
>
> ...
>
> > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> > index 081e335cdee47..e3347fd6eb13a 100644
> > --- a/fs/fs-writeback.c
> > +++ b/fs/fs-writeback.c
> > @@ -2264,16 +2264,16 @@ void __mark_inode_dirty(struct inode *inode, int flags)
> > * Don't do this for I_DIRTY_PAGES - that doesn't actually
> > * dirty the inode itself
> > */
> > - if (flags & (I_DIRTY_INODE | I_DIRTY_TIME)) {
> > + if (flags & I_DIRTY_INODE) {
> > trace_writeback_dirty_inode_start(inode, flags);
> >
> > if (sb->s_op->dirty_inode)
> > sb->s_op->dirty_inode(inode, flags);
>
> OK, but shouldn't we pass just (flags & I_DIRTY_INODE) to ->dirty_inode().
> Just to make it clear what the filesystem is supposed to consume in
> 'flags'...
Aha, you just did that in the following patch ;) So taking back my comment.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2021-01-07 13:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-05 0:54 [PATCH 00/13] lazytime fixes and cleanups Eric Biggers
2021-01-05 0:54 ` [PATCH 01/13] fs: avoid double-writing inodes on lazytime expiration Eric Biggers
2021-01-07 14:47 ` Jan Kara
2021-01-07 14:58 ` Matthew Wilcox
2021-01-07 21:46 ` Eric Biggers
2021-01-08 8:54 ` Christoph Hellwig
2021-01-08 9:01 ` Christoph Hellwig
2021-01-09 17:11 ` Eric Biggers
2021-01-05 0:54 ` [PATCH 02/13] gfs2: don't worry about I_DIRTY_TIME in gfs2_fsync() Eric Biggers
2021-01-08 8:54 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 03/13] fs: only specify I_DIRTY_TIME when needed in generic_update_time() Eric Biggers
2021-01-08 8:57 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 04/13] fat: only specify I_DIRTY_TIME when needed in fat_update_time() Eric Biggers
2021-01-07 13:13 ` Jan Kara
2021-01-07 19:10 ` Eric Biggers
2021-01-05 0:54 ` [PATCH 05/13] fs: don't call ->dirty_inode for lazytime timestamp updates Eric Biggers
2021-01-07 13:17 ` Jan Kara
2021-01-07 13:18 ` Jan Kara [this message]
2021-01-08 9:02 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 06/13] fs: pass only I_DIRTY_INODE flags to ->dirty_inode Eric Biggers
2021-01-08 9:02 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 07/13] fs: correctly document the inode dirty flags Eric Biggers
2021-01-08 9:03 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 08/13] ext4: simplify i_state checks in __ext4_update_other_inode_time() Eric Biggers
2021-01-07 13:24 ` Jan Kara
2021-01-07 19:06 ` Eric Biggers
2021-01-05 0:54 ` [PATCH 09/13] fs: drop redundant checks from __writeback_single_inode() Eric Biggers
2021-01-08 9:12 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 10/13] fs: clean up __mark_inode_dirty() a bit Eric Biggers
2021-01-08 9:10 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 11/13] fs: add a lazytime_expired method Eric Biggers
2021-01-07 14:02 ` Jan Kara
2021-01-07 22:05 ` Eric Biggers
2021-01-08 9:14 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 12/13] xfs: remove a stale comment from xfs_file_aio_write_checks() Eric Biggers
2021-01-08 9:15 ` Christoph Hellwig
2021-01-05 0:54 ` [PATCH 13/13] xfs: implement lazytime_expired Eric Biggers
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