Re: [PATCH 26/30] xfs: improve xfs_forget_acl

[Chandan Rajendra <chandan@linux.ibm.com>]

On Wednesday, January 29, 2020 10:33 PM Christoph Hellwig wrote: 
> Move the function to xfs_acl.c and provide a proper stub for the
> !CONFIG_XFS_POSIX_ACL case.  Lift the flags check to the caller as it
> nicely fits in there.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  fs/xfs/xfs_acl.c   | 16 ++++++++++++++++
>  fs/xfs/xfs_acl.h   |  4 ++--
>  fs/xfs/xfs_ioctl.c |  4 ++--
>  fs/xfs/xfs_xattr.c | 26 ++------------------------
>  4 files changed, 22 insertions(+), 28 deletions(-)
> 
> diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
> index bc78b7c33401..e9a48d718c3a 100644
> --- a/fs/xfs/xfs_acl.c
> +++ b/fs/xfs/xfs_acl.c
> @@ -264,3 +264,19 @@ xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> 
>  	return error;
>  }
> +
> +/*
> + * Invalidate any cached ACLs if the user has bypassed the ACL interface.
> + * We don't validate the content whatsoever so it is caller responsibility to
> + * provide data in valid format and ensure i_mode is consistent.
> + */
> +void
> +xfs_forget_acl(
> +	struct inode		*inode,
> +	const char		*name)
> +{
> +	if (!strcmp(name, SGI_ACL_FILE))
> +		forget_cached_acl(inode, ACL_TYPE_ACCESS);
> +	else if (!strcmp(name, SGI_ACL_DEFAULT))
> +		forget_cached_acl(inode, ACL_TYPE_DEFAULT);
> +}
> diff --git a/fs/xfs/xfs_acl.h b/fs/xfs/xfs_acl.h
> index 94615e34bc86..bd8a306046a9 100644
> --- a/fs/xfs/xfs_acl.h
> +++ b/fs/xfs/xfs_acl.h
> @@ -13,14 +13,14 @@ struct posix_acl;
>  extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
>  extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
>  extern int __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
> +void xfs_forget_acl(struct inode *inode, const char *name);
>  #else
>  static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
>  {
>  	return NULL;
>  }
>  # define xfs_set_acl					NULL
> +# define xfs_forget_acl(inode, name)			0
>  #endif /* CONFIG_XFS_POSIX_ACL */
> 
> -extern void xfs_forget_acl(struct inode *inode, const char *name, int xflags);
> -
>  #endif	/* __XFS_ACL_H__ */
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 5d160e82778e..4f26c3962215 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -509,8 +509,8 @@ xfs_attrmulti_attr_set(
>  	}
> 
>  	error = xfs_attr_set(&args);
> -	if (!error)
> -		xfs_forget_acl(inode, name, flags);
> +	if (!error && (flags & ATTR_ROOT))
> +		xfs_forget_acl(inode, name);
>  	kfree(args.value);
>  	return error;
>  }
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index e1951d2b878e..863e9fdec162 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -37,28 +37,6 @@ xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
>  	return args.valuelen;
>  }
> 
> -void
> -xfs_forget_acl(
> -	struct inode		*inode,
> -	const char		*name,
> -	int			xflags)
> -{
> -	/*
> -	 * Invalidate any cached ACLs if the user has bypassed the ACL
> -	 * interface. We don't validate the content whatsoever so it is caller
> -	 * responsibility to provide data in valid format and ensure i_mode is
> -	 * consistent.
> -	 */
> -	if (xflags & ATTR_ROOT) {
> -#ifdef CONFIG_XFS_POSIX_ACL
> -		if (!strcmp(name, SGI_ACL_FILE))
> -			forget_cached_acl(inode, ACL_TYPE_ACCESS);
> -		else if (!strcmp(name, SGI_ACL_DEFAULT))
> -			forget_cached_acl(inode, ACL_TYPE_DEFAULT);
> -#endif
> -	}
> -}
> -
>  static int
>  xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
>  		struct inode *inode, const char *name, const void *value,
> @@ -81,8 +59,8 @@ xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
>  		args.flags |= ATTR_REPLACE;
> 
>  	error = xfs_attr_set(&args);
> -	if (!error)
> -		xfs_forget_acl(inode, name, args.flags);
> +	if (!error && (flags & ATTR_ROOT))

ATTR_ROOT should be checked against args.flags.

'flags' refers to argument passed to setxattr() syscall i.e. it can have
XATTR_CREATE or XATTR_REPLACE as its value.

The remaining changes look good to me,

Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>


> +		xfs_forget_acl(inode, name);
>  	return error;
>  }
> 
> 

-- 
chandan