On Tue, Jun 29, 2021 at 10:12 PM Gabriel Krisman Bertazi
<krisman@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> ---
> 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
>
