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Date:   Mon, 18 Oct 2021 11:11:48 +0200
From:   Jan Kara <jack@suse.cz>
To:     Gabriel Krisman Bertazi <krisman@collabora.com>
Cc:     jack@suse.com, amir73il@gmail.com, djwong@kernel.org,
        tytso@mit.edu, dhowells@redhat.com, khazhy@google.com,
        linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-api@vger.kernel.org, repnop@google.com, kernel@collabora.com
Subject: Re: [PATCH v7 02/28] fsnotify: pass dentry instead of inode data
Message-ID: <20211018091148.GB29715@quack2.suse.cz>
References: <20211014213646.1139469-1-krisman@collabora.com>
 <20211014213646.1139469-3-krisman@collabora.com>
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On Thu 14-10-21 18:36:20, Gabriel Krisman Bertazi wrote:
> From: Amir Goldstein <amir73il@gmail.com>
> 
> Define a new data type to pass for event - FSNOTIFY_EVENT_DENTRY.
> Use it to pass the dentry instead of it's ->d_inode where available.
> 
> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  include/linux/fsnotify.h         |  5 ++---
>  include/linux/fsnotify_backend.h | 16 ++++++++++++++++
>  2 files changed, 18 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
> index d1144d7c3536..df0fa4687a18 100644
> --- a/include/linux/fsnotify.h
> +++ b/include/linux/fsnotify.h
> @@ -39,8 +39,7 @@ static inline int fsnotify_name(__u32 mask, const void *data, int data_type,
>  static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
>  				   __u32 mask)
>  {
> -	fsnotify_name(mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
> -		      dir, &dentry->d_name, 0);
> +	fsnotify_name(mask, dentry, FSNOTIFY_EVENT_DENTRY, dir, &dentry->d_name, 0);
>  }
>  
>  static inline void fsnotify_inode(struct inode *inode, __u32 mask)
> @@ -87,7 +86,7 @@ static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
>   */
>  static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
>  {
> -	fsnotify_parent(dentry, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE);
> +	fsnotify_parent(dentry, mask, dentry, FSNOTIFY_EVENT_DENTRY);
>  }
>  
>  static inline int fsnotify_file(struct file *file, __u32 mask)
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index 1ce66748a2d2..a2db821e8a8f 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -248,6 +248,7 @@ enum fsnotify_data_type {
>  	FSNOTIFY_EVENT_NONE,
>  	FSNOTIFY_EVENT_PATH,
>  	FSNOTIFY_EVENT_INODE,
> +	FSNOTIFY_EVENT_DENTRY,
>  };
>  
>  static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
> @@ -255,6 +256,8 @@ static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
>  	switch (data_type) {
>  	case FSNOTIFY_EVENT_INODE:
>  		return (struct inode *)data;
> +	case FSNOTIFY_EVENT_DENTRY:
> +		return d_inode(data);
>  	case FSNOTIFY_EVENT_PATH:
>  		return d_inode(((const struct path *)data)->dentry);
>  	default:
> @@ -262,6 +265,19 @@ static inline struct inode *fsnotify_data_inode(const void *data, int data_type)
>  	}
>  }
>  
> +static inline struct dentry *fsnotify_data_dentry(const void *data, int data_type)
> +{
> +	switch (data_type) {
> +	case FSNOTIFY_EVENT_DENTRY:
> +		/* Non const is needed for dget() */
> +		return (struct dentry *)data;
> +	case FSNOTIFY_EVENT_PATH:
> +		return ((const struct path *)data)->dentry;
> +	default:
> +		return NULL;
> +	}
> +}
> +
>  static inline const struct path *fsnotify_data_path(const void *data,
>  						    int data_type)
>  {
> -- 
> 2.33.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR