diff mbox series

[V8,08/11] fs: Define I_DONTCACNE in VFS layer

Message ID 20200415064523.2244712-9-ira.weiny@intel.com (mailing list archive)
State Deferred, archived
Headers show
Series Enable per-file/per-directory DAX operations V8 | expand

Commit Message

Ira Weiny April 15, 2020, 6:45 a.m. UTC 
From: Ira Weiny <ira.weiny@intel.com>

DAX effective mode changes (setting of S_DAX) require inode eviction.

Define a flag which can be set to inform the VFS layer that inodes
should not be cached.  This will expedite the eviction of those nodes
requiring reload.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 include/linux/fs.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Jan Kara April 15, 2020, 8:52 a.m. UTC | #1 
There's a typo in the subject - I_DONTCACNE.

On Tue 14-04-20 23:45:20, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
> 
> DAX effective mode changes (setting of S_DAX) require inode eviction.
> 
> Define a flag which can be set to inform the VFS layer that inodes
> should not be cached.  This will expedite the eviction of those nodes
> requiring reload.
> 
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> ---
>  include/linux/fs.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index a818ced22961..e2db71d150c3 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2151,6 +2151,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
>   *
>   * I_CREATING		New object's inode in the middle of setting up.
>   *
> + * I_DONTCACHE		Do not cache the inode
> + *

Maybe, I'd be more specific here and write: "Evict inode as soon as it is
not used anymore"?

Otherwise the patch looks good to me so feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

Also it would be good to CC Al Viro on this one (and the dentry flag) I
guess.

								Honza

>   * Q: What is the difference between I_WILL_FREE and I_FREEING?
>   */
>  #define I_DIRTY_SYNC		(1 << 0)
> @@ -2173,6 +2175,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
>  #define I_WB_SWITCH		(1 << 13)
>  #define I_OVL_INUSE		(1 << 14)
>  #define I_CREATING		(1 << 15)
> +#define I_DONTCACHE		(1 << 16)
>  
>  #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
>  #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
> @@ -3042,7 +3045,8 @@ extern int inode_needs_sync(struct inode *inode);
>  extern int generic_delete_inode(struct inode *inode);
>  static inline int generic_drop_inode(struct inode *inode)
>  {
> -	return !inode->i_nlink || inode_unhashed(inode);
> +	return !inode->i_nlink || inode_unhashed(inode) ||
> +		(inode->i_state & I_DONTCACHE);
>  }
>  
>  extern struct inode *ilookup5_nowait(struct super_block *sb,
> -- 
> 2.25.1
>
Darrick J. Wong April 15, 2020, 3:18 p.m. UTC | #2 
On Wed, Apr 15, 2020 at 10:52:16AM +0200, Jan Kara wrote:
> There's a typo in the subject - I_DONTCACNE.
> 
> On Tue 14-04-20 23:45:20, ira.weiny@intel.com wrote:
> > From: Ira Weiny <ira.weiny@intel.com>
> > 
> > DAX effective mode changes (setting of S_DAX) require inode eviction.
> > 
> > Define a flag which can be set to inform the VFS layer that inodes
> > should not be cached.  This will expedite the eviction of those nodes
> > requiring reload.
> > 
> > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> > ---
> >  include/linux/fs.h | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index a818ced22961..e2db71d150c3 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -2151,6 +2151,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> >   *
> >   * I_CREATING		New object's inode in the middle of setting up.
> >   *
> > + * I_DONTCACHE		Do not cache the inode
> > + *
> 
> Maybe, I'd be more specific here and write: "Evict inode as soon as it is
> not used anymore"?

I had the same two comments about the V7 version of this patch...

--D

> Otherwise the patch looks good to me so feel free to add:
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> 
> Also it would be good to CC Al Viro on this one (and the dentry flag) I
> guess.
> 
> 								Honza
> 
> >   * Q: What is the difference between I_WILL_FREE and I_FREEING?
> >   */
> >  #define I_DIRTY_SYNC		(1 << 0)
> > @@ -2173,6 +2175,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> >  #define I_WB_SWITCH		(1 << 13)
> >  #define I_OVL_INUSE		(1 << 14)
> >  #define I_CREATING		(1 << 15)
> > +#define I_DONTCACHE		(1 << 16)
> >  
> >  #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
> >  #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
> > @@ -3042,7 +3045,8 @@ extern int inode_needs_sync(struct inode *inode);
> >  extern int generic_delete_inode(struct inode *inode);
> >  static inline int generic_drop_inode(struct inode *inode)
> >  {
> > -	return !inode->i_nlink || inode_unhashed(inode);
> > +	return !inode->i_nlink || inode_unhashed(inode) ||
> > +		(inode->i_state & I_DONTCACHE);
> >  }
> >  
> >  extern struct inode *ilookup5_nowait(struct super_block *sb,
> > -- 
> > 2.25.1
> > 
> -- 
> Jan Kara <jack@suse.com>
> SUSE Labs, CR
Ira Weiny April 16, 2020, 4:28 a.m. UTC | #3 
On Wed, Apr 15, 2020 at 10:52:16AM +0200, Jan Kara wrote:
> There's a typo in the subject - I_DONTCACNE.
> 
> On Tue 14-04-20 23:45:20, ira.weiny@intel.com wrote:
> > From: Ira Weiny <ira.weiny@intel.com>
> > 
> > DAX effective mode changes (setting of S_DAX) require inode eviction.
> > 
> > Define a flag which can be set to inform the VFS layer that inodes
> > should not be cached.  This will expedite the eviction of those nodes
> > requiring reload.
> > 
> > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> > ---
> >  include/linux/fs.h | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index a818ced22961..e2db71d150c3 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -2151,6 +2151,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> >   *
> >   * I_CREATING		New object's inode in the middle of setting up.
> >   *
> > + * I_DONTCACHE		Do not cache the inode
> > + *
> 
> Maybe, I'd be more specific here and write: "Evict inode as soon as it is
> not used anymore"?

Thanks!  done

> 
> Otherwise the patch looks good to me so feel free to add:
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> 
> Also it would be good to CC Al Viro on this one (and the dentry flag) I
> guess.

Thanks I'll add him on those,

Thanks,
Ira

> 
> 								Honza
> 
> >   * Q: What is the difference between I_WILL_FREE and I_FREEING?
> >   */
> >  #define I_DIRTY_SYNC		(1 << 0)
> > @@ -2173,6 +2175,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> >  #define I_WB_SWITCH		(1 << 13)
> >  #define I_OVL_INUSE		(1 << 14)
> >  #define I_CREATING		(1 << 15)
> > +#define I_DONTCACHE		(1 << 16)
> >  
> >  #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
> >  #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
> > @@ -3042,7 +3045,8 @@ extern int inode_needs_sync(struct inode *inode);
> >  extern int generic_delete_inode(struct inode *inode);
> >  static inline int generic_drop_inode(struct inode *inode)
> >  {
> > -	return !inode->i_nlink || inode_unhashed(inode);
> > +	return !inode->i_nlink || inode_unhashed(inode) ||
> > +		(inode->i_state & I_DONTCACHE);
> >  }
> >  
> >  extern struct inode *ilookup5_nowait(struct super_block *sb,
> > -- 
> > 2.25.1
> > 
> -- 
> Jan Kara <jack@suse.com>
> SUSE Labs, CR
Ira Weiny April 16, 2020, 4:28 a.m. UTC | #4 
On Wed, Apr 15, 2020 at 08:18:32AM -0700, Darrick J. Wong wrote:
> On Wed, Apr 15, 2020 at 10:52:16AM +0200, Jan Kara wrote:
> > There's a typo in the subject - I_DONTCACNE.
> > 
> > On Tue 14-04-20 23:45:20, ira.weiny@intel.com wrote:
> > > From: Ira Weiny <ira.weiny@intel.com>
> > > 
> > > DAX effective mode changes (setting of S_DAX) require inode eviction.
> > > 
> > > Define a flag which can be set to inform the VFS layer that inodes
> > > should not be cached.  This will expedite the eviction of those nodes
> > > requiring reload.
> > > 
> > > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> > > ---
> > >  include/linux/fs.h | 6 +++++-
> > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > > index a818ced22961..e2db71d150c3 100644
> > > --- a/include/linux/fs.h
> > > +++ b/include/linux/fs.h
> > > @@ -2151,6 +2151,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> > >   *
> > >   * I_CREATING		New object's inode in the middle of setting up.
> > >   *
> > > + * I_DONTCACHE		Do not cache the inode
> > > + *
> > 
> > Maybe, I'd be more specific here and write: "Evict inode as soon as it is
> > not used anymore"?
> 
> I had the same two comments about the V7 version of this patch...

Sorry I must have missed it.

Done for V9,
Ira

> 
> --D
> 
> > Otherwise the patch looks good to me so feel free to add:
> > 
> > Reviewed-by: Jan Kara <jack@suse.cz>
> > 
> > Also it would be good to CC Al Viro on this one (and the dentry flag) I
> > guess.
> > 
> > 								Honza
> > 
> > >   * Q: What is the difference between I_WILL_FREE and I_FREEING?
> > >   */
> > >  #define I_DIRTY_SYNC		(1 << 0)
> > > @@ -2173,6 +2175,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
> > >  #define I_WB_SWITCH		(1 << 13)
> > >  #define I_OVL_INUSE		(1 << 14)
> > >  #define I_CREATING		(1 << 15)
> > > +#define I_DONTCACHE		(1 << 16)
> > >  
> > >  #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
> > >  #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
> > > @@ -3042,7 +3045,8 @@ extern int inode_needs_sync(struct inode *inode);
> > >  extern int generic_delete_inode(struct inode *inode);
> > >  static inline int generic_drop_inode(struct inode *inode)
> > >  {
> > > -	return !inode->i_nlink || inode_unhashed(inode);
> > > +	return !inode->i_nlink || inode_unhashed(inode) ||
> > > +		(inode->i_state & I_DONTCACHE);
> > >  }
> > >  
> > >  extern struct inode *ilookup5_nowait(struct super_block *sb,
> > > -- 
> > > 2.25.1
> > > 
> > -- 
> > Jan Kara <jack@suse.com>
> > SUSE Labs, CR
diff mbox series

Patch

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a818ced22961..e2db71d150c3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2151,6 +2151,8 @@  static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
  *
  * I_CREATING		New object's inode in the middle of setting up.
  *
+ * I_DONTCACHE		Do not cache the inode
+ *
  * Q: What is the difference between I_WILL_FREE and I_FREEING?
  */
 #define I_DIRTY_SYNC		(1 << 0)
@@ -2173,6 +2175,7 @@  static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
 #define I_WB_SWITCH		(1 << 13)
 #define I_OVL_INUSE		(1 << 14)
 #define I_CREATING		(1 << 15)
+#define I_DONTCACHE		(1 << 16)
 
 #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
 #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
@@ -3042,7 +3045,8 @@  extern int inode_needs_sync(struct inode *inode);
 extern int generic_delete_inode(struct inode *inode);
 static inline int generic_drop_inode(struct inode *inode)
 {
-	return !inode->i_nlink || inode_unhashed(inode);
+	return !inode->i_nlink || inode_unhashed(inode) ||
+		(inode->i_state & I_DONTCACHE);
 }
 
 extern struct inode *ilookup5_nowait(struct super_block *sb,