Linux-Fsdevel Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Ira Weiny <ira.weiny@intel.com>
To: Hao Li <lihao2018.fnst@cn.fujitsu.com>
Cc: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, y-goto@fujitsu.com
Subject: Re: [PATCH] fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set
Date: Fri, 21 Aug 2020 10:40:41 -0700	[thread overview]
Message-ID: <20200821174040.GG3142014@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20200821015953.22956-1-lihao2018.fnst@cn.fujitsu.com>

On Fri, Aug 21, 2020 at 09:59:53AM +0800, Hao Li wrote:
> Currently, DCACHE_REFERENCED prevents the dentry with DCACHE_DONTCACHE
> set from being killed, so the corresponding inode can't be evicted. If
> the DAX policy of an inode is changed, we can't make policy changing
> take effects unless dropping caches manually.
> 
> This patch fixes this problem and flushes the inode to disk to prepare
> for evicting it.

This looks intriguing and I really hope this helps but I don't think this will
guarantee that the state changes immediately will it?

Do you have a test case which fails before and passes after?  Perhaps one of
the new xfstests submitted by Xiao?

Ira

> 
> Signed-off-by: Hao Li <lihao2018.fnst@cn.fujitsu.com>
> ---
>  fs/dcache.c | 3 ++-
>  fs/inode.c  | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/dcache.c b/fs/dcache.c
> index ea0485861d93..486c7409dc82 100644
> --- a/fs/dcache.c
> +++ b/fs/dcache.c
> @@ -796,7 +796,8 @@ static inline bool fast_dput(struct dentry *dentry)
>  	 */
>  	smp_rmb();
>  	d_flags = READ_ONCE(dentry->d_flags);
> -	d_flags &= DCACHE_REFERENCED | DCACHE_LRU_LIST | DCACHE_DISCONNECTED;
> +	d_flags &= DCACHE_REFERENCED | DCACHE_LRU_LIST | DCACHE_DISCONNECTED
> +			| DCACHE_DONTCACHE;
>  
>  	/* Nothing to do? Dropping the reference was all we needed? */
>  	if (d_flags == (DCACHE_REFERENCED | DCACHE_LRU_LIST) && !d_unhashed(dentry))
> diff --git a/fs/inode.c b/fs/inode.c
> index 72c4c347afb7..5218a8aebd7f 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1632,7 +1632,7 @@ static void iput_final(struct inode *inode)
>  	}
>  
>  	state = inode->i_state;
> -	if (!drop) {
> +	if (!drop || (drop && (inode->i_state & I_DONTCACHE))) {
>  		WRITE_ONCE(inode->i_state, state | I_WILL_FREE);
>  		spin_unlock(&inode->i_lock);
>  
> -- 
> 2.28.0
> 
> 
> 

  reply	other threads:[~2020-08-21 17:40 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-21  1:59 Hao Li
2020-08-21 17:40 ` Ira Weiny [this message]
2020-08-23  6:54   ` Ira Weiny
2020-08-24  6:17     ` Li, Hao
2020-08-26 10:06       ` Li, Hao
2020-08-27  6:37 ` Dave Chinner
2020-08-27  9:58   ` Li, Hao
2020-08-28  0:35     ` Dave Chinner
2020-08-28  9:04       ` Li, Hao
2020-08-31  0:34         ` Dave Chinner
2020-08-31  9:45           ` Li, Hao
2020-11-10  2:59 Hao Li
2020-12-08  2:10 Hao Li

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200821174040.GG3142014@iweiny-DESK2.sc.intel.com \
    --to=ira.weiny@intel.com \
    --cc=lihao2018.fnst@cn.fujitsu.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=viro@zeniv.linux.org.uk \
    --cc=y-goto@fujitsu.com \
    --subject='Re: [PATCH] fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).