Re: [PATCH v14 01/22] vfs: Add IS_ACL() and IS_RICHACL() tests

Andreas Dilger
2015-11-06T20:40:19Z

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On Nov 5, 2015, at 4:39 AM, Andreas Gruenbacher <agruenba@redhat.com> wrote:
>
> The vfs does not apply the umask for file systems that support acls. The
> test used for this used to be called IS_POSIXACL(). Switch to a new
> IS_ACL() test to check for either posix acls or richacls instead. Add a new
> MS_RICHACL flag and IS_RICHACL() test for richacls alone. The IS_POSIXACL()
> test is still needed by nfsd.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
> Reviewed-by: J. Bruce Fields <bfields@redhat.com>

Looks good to me.

Reviewed-by: Andreas Dilger <adilger@dilger.ca>

> ---
> fs/Kconfig | 3 +++
> fs/namei.c | 8 ++++----
> include/linux/fs.h | 12 ++++++++++++
> include/uapi/linux/fs.h | 3 ++-
> 4 files changed, 21 insertions(+), 5 deletions(-)
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index da3f32f..bff2879 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -56,6 +56,9 @@ endif # BLOCK
> config FS_POSIX_ACL
> def_bool n
>
> +config FS_RICHACL
> + def_bool n
> +
> config EXPORTFS
> tristate
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 33e9495..224ecf1 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2798,7 +2798,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
> }
>
> mode = op->mode;
> - if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
> + if ((open_flag & O_CREAT) && !IS_ACL(dir))
> mode &= ~current_umask();
>
> excl = (open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT);
> @@ -2982,7 +2982,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
> /* Negative dentry, just create the file */
> if (!dentry->d_inode && (op->open_flag & O_CREAT)) {
> umode_t mode = op->mode;
> - if (!IS_POSIXACL(dir->d_inode))
> + if (!IS_ACL(dir->d_inode))
> mode &= ~current_umask();
> /*
> * This write is needed to ensure that a
> @@ -3553,7 +3553,7 @@ retry:
> if (IS_ERR(dentry))
> return PTR_ERR(dentry);
>
> - if (!IS_POSIXACL(path.dentry->d_inode))
> + if (!IS_ACL(path.dentry->d_inode))
> mode &= ~current_umask();
> error = security_path_mknod(&path, dentry, mode, dev);
> if (error)
> @@ -3622,7 +3622,7 @@ retry:
> if (IS_ERR(dentry))
> return PTR_ERR(dentry);
>
> - if (!IS_POSIXACL(path.dentry->d_inode))
> + if (!IS_ACL(path.dentry->d_inode))
> mode &= ~current_umask();
> error = security_path_mkdir(&path, dentry, mode);
> if (!error)
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 72d8a84..4efa435 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1781,6 +1781,12 @@ struct super_operations {
> #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
> #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
>
> +#ifdef CONFIG_FS_RICHACL
> +#define IS_RICHACL(inode) __IS_FLG(inode, MS_RICHACL)
> +#else
> +#define IS_RICHACL(inode) 0
> +#endif
> +
> #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
> #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
> #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
> @@ -1794,6 +1800,12 @@ struct super_operations {
> (inode)->i_rdev == WHITEOUT_DEV)
>
> /*
> + * IS_ACL() tells the VFS to not apply the umask
> + * and use check_acl for acl permission checks when defined.
> + */
> +#define IS_ACL(inode) __IS_FLG(inode, MS_POSIXACL | MS_RICHACL)
> +
> +/*
> * Inode state bits. Protected by inode->i_lock
> *
> * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
> diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> index 9b964a5..6ac6bc9 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -81,7 +81,7 @@ struct inodes_stat_t {
> #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
> MS_VERBOSE is deprecated. */
> #define MS_SILENT 32768
> -#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
> +#define MS_POSIXACL (1<<16) /* Supports POSIX ACLs */
> #define MS_UNBINDABLE (1<<17) /* change to unbindable */
> #define MS_PRIVATE (1<<18) /* change to private */
> #define MS_SLAVE (1<<19) /* change to slave */
> @@ -91,6 +91,7 @@ struct inodes_stat_t {
> #define MS_I_VERSION (1<<23) /* Update inode I_version field */
> #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
> #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
> +#define MS_RICHACL (1<<26) /* Supports richacls */
>
> /* These sb flags are internal to the kernel */
> #define MS_NOSEC (1<<28)
> --
> 2.5.0
>

Cheers, Andreas

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