Re: [PATCH v5 16/22] fsnotify: remove check that source dentry is positive

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On Thu 16-07-20 11:42:24, Amir Goldstein wrote:
> Remove the unneeded check for positive source dentry in
> fsnotify_move().
> 
> fsnotify_move() hook is mostly called from vfs_rename() under
> lock_rename() and vfs_rename() starts with may_delete() test that
> verifies positive source dentry.  The only other caller of
> fsnotify_move() - debugfs_rename() also verifies positive source.
> 
> Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>

But in vfs_rename() if RENAME_EXCHANGE is set and target is NULL,
new_dentry can be negative when calling fsnotify_move() AFAICT, cannot it?

								Honza

> ---
>  include/linux/fsnotify.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
> index 044cae3a0628..fe4f2bc5b4c2 100644
> --- a/include/linux/fsnotify.h
> +++ b/include/linux/fsnotify.h
> @@ -149,8 +149,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
>  	if (target)
>  		fsnotify_link_count(target);
>  
> -	if (source)
> -		fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
> +	fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
>  	audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
>  }
>  
> -- 
> 2.17.1
> 
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR



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