[PATCH 13/79] autofs: switch to new ctime accessors

[PATCH 13/79] autofs: switch to new ctime accessors

[Jeff Layton]

In later patches, we're going to change how the ctime.tv_nsec field is
utilized. Switch to using accessor functions instead of raw accesses of
inode->i_ctime.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/autofs/inode.c | 2 +-
 fs/autofs/root.c  | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index affa70360b1f..47e3054b29dc 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -370,7 +370,7 @@ struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
 		inode->i_uid = d_inode(sb->s_root)->i_uid;
 		inode->i_gid = d_inode(sb->s_root)->i_gid;
 	}
-	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_atime = inode->i_mtime = inode_ctime_set_current(inode);
 	inode->i_ino = get_next_ino();
 
 	if (S_ISDIR(mode)) {
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 93046c9dc461..4c0fc0f8d688 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -600,7 +600,7 @@ static int autofs_dir_symlink(struct mnt_idmap *idmap,
 	p_ino = autofs_dentry_ino(dentry->d_parent);
 	p_ino->count++;
 
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_ctime_set_current(dir);
 
 	return 0;
 }
@@ -633,7 +633,7 @@ static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
 	d_inode(dentry)->i_size = 0;
 	clear_nlink(d_inode(dentry));
 
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_ctime_set_current(dir);
 
 	spin_lock(&sbi->lookup_lock);
 	__autofs_add_expiring(dentry);
@@ -749,7 +749,7 @@ static int autofs_dir_mkdir(struct mnt_idmap *idmap,
 	p_ino = autofs_dentry_ino(dentry->d_parent);
 	p_ino->count++;
 	inc_nlink(dir);
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_ctime_set_current(dir);
 
 	return 0;
 }
-- 
2.41.0

Re: [PATCH 01/79] fs: add ctime accessors infrastructure

[Jan Kara]

On Wed 21-06-23 10:45:06, Jeff Layton wrote:
> struct timespec64 has unused bits in the tv_nsec field that can be used
> for other purposes. In future patches, we're going to change how the
> inode->i_ctime is accessed in certain inodes in order to make use of
> them. In order to do that safely though, we'll need to eradicate raw
> accesses of the inode->i_ctime field from the kernel.
> 
> Add new accessor functions for the ctime that we can use to replace them.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Looks good to me. Feel free to add:

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

								Honza

> ---
>  fs/inode.c         | 16 ++++++++++++++
>  include/linux/fs.h | 53 +++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 68 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index d37fad91c8da..c005e7328fbb 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2499,6 +2499,22 @@ struct timespec64 current_time(struct inode *inode)
>  }
>  EXPORT_SYMBOL(current_time);
>  
> +/**
> + * inode_ctime_set_current - set the ctime to current_time
> + * @inode: inode
> + *
> + * Set the inode->i_ctime to the current value for the inode. Returns
> + * the current value that was assigned to i_ctime.
> + */
> +struct timespec64 inode_ctime_set_current(struct inode *inode)
> +{
> +	struct timespec64 now = current_time(inode);
> +
> +	inode_set_ctime(inode, now);
> +	return now;
> +}
> +EXPORT_SYMBOL(inode_ctime_set_current);
> +
>  /**
>   * in_group_or_capable - check whether caller is CAP_FSETID privileged
>   * @idmap:	idmap of the mount @inode was found from
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 6867512907d6..9afb30606373 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1474,7 +1474,58 @@ static inline bool fsuidgid_has_mapping(struct super_block *sb,
>  	       kgid_has_mapping(fs_userns, kgid);
>  }
>  
> -extern struct timespec64 current_time(struct inode *inode);
> +struct timespec64 current_time(struct inode *inode);
> +struct timespec64 inode_ctime_set_current(struct inode *inode);
> +
> +/**
> + * inode_ctime_peek - fetch the current ctime from the inode
> + * @inode: inode from which to fetch ctime
> + *
> + * Grab the current ctime from the inode and return it.
> + */
> +static inline struct timespec64 inode_ctime_peek(const struct inode *inode)
> +{
> +	return inode->i_ctime;
> +}
> +
> +/**
> + * inode_ctime_set - set the ctime in the inode to the given value
> + * @inode: inode in which to set the ctime
> + * @ts: timespec value to set the ctime
> + *
> + * Set the ctime in @inode to @ts.
> + */
> +static inline struct timespec64 inode_ctime_set(struct inode *inode, struct timespec64 ts)
> +{
> +	inode->i_ctime = ts;
> +	return ts;
> +}
> +
> +/**
> + * inode_ctime_set_sec - set only the tv_sec field in the inode ctime
> + * @inode: inode in which to set the ctime
> + * @sec:  value to set the tv_sec field
> + *
> + * Set the sec field in the ctime. Returns @sec.
> + */
> +static inline time64_t inode_ctime_set_sec(struct inode *inode, time64_t sec)
> +{
> +	inode->i_ctime.tv_sec = sec;
> +	return sec;
> +}
> +
> +/**
> + * inode_ctime_set_nsec - set only the tv_nsec field in the inode ctime
> + * @inode: inode in which to set the ctime
> + * @nsec:  value to set the tv_nsec field
> + *
> + * Set the nsec field in the ctime. Returns @nsec.
> + */
> +static inline long inode_ctime_set_nsec(struct inode *inode, long nsec)
> +{
> +	inode->i_ctime.tv_nsec = nsec;
> +	return nsec;
> +}
>  
>  /*
>   * Snapshotting support.
> -- 
> 2.41.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

Re: [PATCH 13/79] autofs: switch to new ctime accessors

[Jan Kara]

On Wed 21-06-23 10:45:26, Jeff Layton wrote:
> In later patches, we're going to change how the ctime.tv_nsec field is
> utilized. Switch to using accessor functions instead of raw accesses of
> inode->i_ctime.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Looks good to me. Feel free to add:

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

								Honza

> ---
>  fs/autofs/inode.c | 2 +-
>  fs/autofs/root.c  | 6 +++---
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
> index affa70360b1f..47e3054b29dc 100644
> --- a/fs/autofs/inode.c
> +++ b/fs/autofs/inode.c
> @@ -370,7 +370,7 @@ struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
>  		inode->i_uid = d_inode(sb->s_root)->i_uid;
>  		inode->i_gid = d_inode(sb->s_root)->i_gid;
>  	}
> -	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
> +	inode->i_atime = inode->i_mtime = inode_ctime_set_current(inode);
>  	inode->i_ino = get_next_ino();
>  
>  	if (S_ISDIR(mode)) {
> diff --git a/fs/autofs/root.c b/fs/autofs/root.c
> index 93046c9dc461..4c0fc0f8d688 100644
> --- a/fs/autofs/root.c
> +++ b/fs/autofs/root.c
> @@ -600,7 +600,7 @@ static int autofs_dir_symlink(struct mnt_idmap *idmap,
>  	p_ino = autofs_dentry_ino(dentry->d_parent);
>  	p_ino->count++;
>  
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>  
>  	return 0;
>  }
> @@ -633,7 +633,7 @@ static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
>  	d_inode(dentry)->i_size = 0;
>  	clear_nlink(d_inode(dentry));
>  
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>  
>  	spin_lock(&sbi->lookup_lock);
>  	__autofs_add_expiring(dentry);
> @@ -749,7 +749,7 @@ static int autofs_dir_mkdir(struct mnt_idmap *idmap,
>  	p_ino = autofs_dentry_ino(dentry->d_parent);
>  	p_ino->count++;
>  	inc_nlink(dir);
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>  
>  	return 0;
>  }
> -- 
> 2.41.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

Re: [PATCH 00/79] fs: new accessors for inode->i_ctime

[Steven Rostedt]

On Wed, 21 Jun 2023 10:45:05 -0400
Jeff Layton <jlayton@kernel.org> wrote:

> Most of this conversion was done via coccinelle, with a few of the more
> non-standard accesses done by hand. There should be no behavioral
> changes with this set. That will come later, as we convert individual
> filesystems to use multigrain timestamps.

BTW, Linus has suggested to me that whenever a conccinelle script is used,
it should be included in the change log.

-- Steve

Re: [PATCH 00/79] fs: new accessors for inode->i_ctime

[Jeff Layton]

On Wed, 2023-06-21 at 15:21 -0400, Steven Rostedt wrote:
> On Wed, 21 Jun 2023 10:45:05 -0400
> Jeff Layton <jlayton@kernel.org> wrote:
> 
> > Most of this conversion was done via coccinelle, with a few of the more
> > non-standard accesses done by hand. There should be no behavioral
> > changes with this set. That will come later, as we convert individual
> > filesystems to use multigrain timestamps.
> 
> BTW, Linus has suggested to me that whenever a conccinelle script is used,
> it should be included in the change log.
> 

Ok, here's what I have. I note again that my usage of coccinelle is
pretty primitive, so I ended up doing a fair bit of by-hand fixing after
applying these.

Given the way that this change is broken up into 77 patches by
subsystem, to which changelogs should I add it? I could add it to the
"infrastructure" patch, but that's the one where I _didn't_ use it. 

Maybe to patch #79 (the one that renames i_ctime)?


------------------------8<------------------------------
@@
expression inode;
@@

- inode->i_ctime = current_time(inode)
+ inode_set_current_ctime(inode)

@@
expression inode;
@@

- inode->i_ctime = inode->i_mtime = current_time(inode)
+ inode->i_mtime = inode_set_current_ctime(inode)

@@
struct inode *inode;
expression value;
@@

- inode->i_ctime = value;
+ inode_set_ctime(inode, value);

@@
struct inode *inode;
expression val;
@@
- inode->i_ctime.tv_sec = val
+ inode_set_ctime_sec(inode, val)

@@
struct inode *inode;
expression val;
@@
- inode->i_ctime.tv_nsec = val
+ inode_set_ctime_nsec(inode, val)

@@
struct inode *inode;
@@
- inode->i_ctime
+ inode_ctime_peek(inode)

Re: [PATCH 00/79] fs: new accessors for inode->i_ctime

[Christian Brauner]

On Wed, Jun 21, 2023 at 03:52:27PM -0400, Jeff Layton wrote:
> On Wed, 2023-06-21 at 15:21 -0400, Steven Rostedt wrote:
> > On Wed, 21 Jun 2023 10:45:05 -0400
> > Jeff Layton <jlayton@kernel.org> wrote:
> > 
> > > Most of this conversion was done via coccinelle, with a few of the more
> > > non-standard accesses done by hand. There should be no behavioral
> > > changes with this set. That will come later, as we convert individual
> > > filesystems to use multigrain timestamps.
> > 
> > BTW, Linus has suggested to me that whenever a conccinelle script is used,
> > it should be included in the change log.
> > 
> 
> Ok, here's what I have. I note again that my usage of coccinelle is
> pretty primitive, so I ended up doing a fair bit of by-hand fixing after
> applying these.
> 
> Given the way that this change is broken up into 77 patches by
> subsystem, to which changelogs should I add it? I could add it to the
> "infrastructure" patch, but that's the one where I _didn't_ use it. 
> 
> Maybe to patch #79 (the one that renames i_ctime)?

That works. I can also put this into a merge commit or pr message.


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Re: [PATCH 13/79] autofs: switch to new ctime accessors

[Ian Kent]

On 21/623 22:45, Jeff Layton wrote:
> In later patches, we're going to change how the ctime.tv_nsec field is
> utilized. Switch to using accessor functions instead of raw accesses of
> inode->i_ctime.
>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Looks fine to me.

Please feel free to add my Acked-by or even Signed-off-by as

you need dictates.


Ian

> ---
>   fs/autofs/inode.c | 2 +-
>   fs/autofs/root.c  | 6 +++---
>   2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
> index affa70360b1f..47e3054b29dc 100644
> --- a/fs/autofs/inode.c
> +++ b/fs/autofs/inode.c
> @@ -370,7 +370,7 @@ struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
>   		inode->i_uid = d_inode(sb->s_root)->i_uid;
>   		inode->i_gid = d_inode(sb->s_root)->i_gid;
>   	}
> -	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
> +	inode->i_atime = inode->i_mtime = inode_ctime_set_current(inode);
>   	inode->i_ino = get_next_ino();
>   
>   	if (S_ISDIR(mode)) {
> diff --git a/fs/autofs/root.c b/fs/autofs/root.c
> index 93046c9dc461..4c0fc0f8d688 100644
> --- a/fs/autofs/root.c
> +++ b/fs/autofs/root.c
> @@ -600,7 +600,7 @@ static int autofs_dir_symlink(struct mnt_idmap *idmap,
>   	p_ino = autofs_dentry_ino(dentry->d_parent);
>   	p_ino->count++;
>   
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>   
>   	return 0;
>   }
> @@ -633,7 +633,7 @@ static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
>   	d_inode(dentry)->i_size = 0;
>   	clear_nlink(d_inode(dentry));
>   
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>   
>   	spin_lock(&sbi->lookup_lock);
>   	__autofs_add_expiring(dentry);
> @@ -749,7 +749,7 @@ static int autofs_dir_mkdir(struct mnt_idmap *idmap,
>   	p_ino = autofs_dentry_ino(dentry->d_parent);
>   	p_ino->count++;
>   	inc_nlink(dir);
> -	dir->i_mtime = dir->i_ctime = current_time(dir);
> +	dir->i_mtime = inode_ctime_set_current(dir);
>   
>   	return 0;
>   }

Re: [PATCH 00/79] fs: new accessors for inode->i_ctime

[Luis Chamberlain]

On Wed, Jun 21, 2023 at 03:21:41PM -0400, Steven Rostedt wrote:
> On Wed, 21 Jun 2023 10:45:05 -0400
> Jeff Layton <jlayton@kernel.org> wrote:
> 
> > Most of this conversion was done via coccinelle, with a few of the more
> > non-standard accesses done by hand. There should be no behavioral
> > changes with this set. That will come later, as we convert individual
> > filesystems to use multigrain timestamps.
> 
> BTW, Linus has suggested to me that whenever a conccinelle script is used,
> it should be included in the change log.

Sometimes people like the coccinelle included in the commit, sometimes
people don't [0], it really ends up being up to a subjective maintainer
preference. A compromise could be to use git notes as these are
optional, however if we want to go down that path we should try to make
a general consensus on it so we can send a consistent message.

[0] https://lore.kernel.org/all/20230512073100.GC32559@twin.jikos.cz/

  Luis

Re: [PATCH 01/79] fs: add ctime accessors infrastructure

[Luis Chamberlain]

On Wed, Jun 21, 2023 at 10:45:06AM -0400, Jeff Layton wrote:
> struct timespec64 has unused bits in the tv_nsec field that can be used
> for other purposes. In future patches, we're going to change how the
> inode->i_ctime is accessed in certain inodes in order to make use of
> them. In order to do that safely though, we'll need to eradicate raw
> accesses of the inode->i_ctime field from the kernel.
> 
> Add new accessor functions for the ctime that we can use to replace them.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>

  Luis