[PATCH v3 07/24] fs: Fix function docstring for posix_acl_update_mode()

["Tobin C. Harding" <tobin@kernel.org>]

Sphinx emits a bunch of warnings due to undocumented function parameters
for posix_acl_update_mode().  We should document all the parameters.

Docstring is currently stale in places, it references a non-existent
function, inode_change_ok().  As noted in the documentation file
Documentation/filesystems/Porting this function is now called
setattr_prepare().

Currently docstring includes 'setgit bit', meaning is not totally
clear (to me), setattr_prepare() uses term 'SGID bit', let's use this
too.

Fix function docstring for posix_acl_update_mode():

 - Document function parameters.
 - Reference setattr_prepare() instead of inode_change_ok().
 - Use 'SGID bit' instead of 'setgit bit'.

Signed-off-by: Tobin C. Harding <tobin@kernel.org>
---
 fs/posix_acl.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 2fd0fde16fe1..07394510c3d6 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -629,14 +629,18 @@ posix_acl_create(struct inode *dir, umode_t *mode,
 EXPORT_SYMBOL_GPL(posix_acl_create);
 
 /**
- * posix_acl_update_mode  -  update mode in set_acl
+ * posix_acl_update_mode() - Update mode in set_acl.
+ * @inode: The inode we are working on.
+ * @mode_p: New mode to use when updating.
+ * @acl: ACL we are operating on.
  *
- * Update the file mode when setting an ACL: compute the new file permission
- * bits based on the ACL.  In addition, if the ACL is equivalent to the new
- * file mode, set *acl to NULL to indicate that no ACL should be set.
+ * Update the file mode when setting an ACL, compute the new file
+ * permission bits based on the ACL.  In addition, if the ACL is
+ * equivalent to the new file mode, set ``*acl`` to %NULL to indicate
+ * that no ACL should be set.
  *
- * As with chmod, clear the setgit bit if the caller is not in the owning group
- * or capable of CAP_FSETID (see inode_change_ok).
+ * As with chmod, clear the SGID bit if the caller is not in the owning
+ * group or capable of CAP_FSETID (see setattr_prepare()).
  *
  * Called from set_acl inode operations.
  */
-- 
2.21.0