linux-ext4 - Re: [PATCH v3 11/15] fsnotify: Introduce helpers to send error

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Date:   Thu, 8 Jul 2021 13:02:48 +0200
From:   Jan Kara <jack@...e.cz>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     amir73il@...il.com, djwong@...nel.org, tytso@....edu,
        david@...morbit.com, jack@...e.com, dhowells@...hat.com,
        khazhy@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v3 11/15] fsnotify: Introduce helpers to send error_events

On Tue 29-06-21 15:10:31, Gabriel Krisman Bertazi wrote:
> Introduce helpers for filesystems interested in reporting FS_ERROR
> events.  When notifying errors, the file system might not have an inode
> to report on the error.  To support this, allow the caller to specify
> the superblock to which the error applies.
> 
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>

Looks OK. Feel free to add:

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

								Honza

> 
> ---
> Changes since v2:
>   - Drop reference to s_fnotify_marks and guards (Amir)
> 
> Changes since v1:
>   - Use the inode argument (Amir)
>   - Protect s_fsnotify_marks with ifdef guard
> ---
>  fs/notify/fsnotify.c             |  2 +-
>  include/linux/fsnotify.h         | 13 +++++++++++++
>  include/linux/fsnotify_backend.h |  1 +
>  3 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
> index 36205a769dde..ac05eb3fb368 100644
> --- a/fs/notify/fsnotify.c
> +++ b/fs/notify/fsnotify.c
> @@ -491,7 +491,7 @@ int __fsnotify(__u32 mask, const struct fsnotify_event_info *event_info)
>  		 */
>  		parent = event_info->dir;
>  	}
> -	sb = inode->i_sb;
> +	sb = event_info->sb ?: inode->i_sb;
>  
>  	/*
>  	 * Optimization: srcu_read_lock() has a memory barrier which can
> diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
> index 8c2c681b4495..684c79ca01b2 100644
> --- a/include/linux/fsnotify.h
> +++ b/include/linux/fsnotify.h
> @@ -326,4 +326,17 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
>  		fsnotify_dentry(dentry, mask);
>  }
>  
> +static inline int fsnotify_sb_error(struct super_block *sb, struct inode *inode,
> +				    int error)
> +{
> +	struct fs_error_report report = {
> +		.error = error,
> +		.inode = inode,
> +	};
> +
> +	return __fsnotify(FS_ERROR, &(struct fsnotify_event_info) {
> +			.data = &report, .data_type = FSNOTIFY_EVENT_ERROR,
> +			.sb = sb});
> +}
> +
>  #endif	/* _LINUX_FS_NOTIFY_H */
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index ea5f5c7cc381..5a32c5010f45 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -138,6 +138,7 @@ struct fsnotify_event_info {
>  	struct inode *dir;
>  	const struct qstr *name;
>  	struct inode *inode;
> +	struct super_block *sb;
>  	u32 cookie;
>  };
>  
> -- 
> 2.32.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR