[JFFS2] Tidy up fix for ACL/permissions problem.

[In commit 9ed437c50d89eabae763dd422579f73fdebf288d we fixed a problem 
with standard permissions on newly-created inodes, when POSIX ACLs are 
enabled. This cleans it up...]

The attached patch separate jffs2_init_acl() into two parts.

The one is jffs2_init_acl_pre() called from jffs2_new_inode().
It compute ACL oriented inode->i_mode bits, and allocate in-memory ACL
objects associated with the new inode just before when inode meta
infomation is written to the medium.

The other is jffs2_init_acl_post() called from jffs2_symlink(),
jffs2_mkdir(), jffs2_mknod() and jffs2_do_create().
It actually writes in-memory ACL objects into the medium next to
the success of writing meta-information.

In the current implementation, we have to write a same inode meta
infomation twice when inode->i_mode is updated by the default ACL.
However, we can avoid the behavior by putting an updated i_mode
before it is written at first, as jffs2_init_acl_pre() doing.

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h
index 90a2dbf59051..76c6ebd1acd9 100644
--- a/fs/jffs2/acl.h
+++ b/fs/jffs2/acl.h
@@ -31,7 +31,8 @@ struct jffs2_acl_header {
 extern struct posix_acl *jffs2_get_acl(struct inode *inode, int type);
 extern int jffs2_permission(struct inode *, int, struct nameidata *);
 extern int jffs2_acl_chmod(struct inode *);
-extern int jffs2_init_acl(struct inode *, struct posix_acl *);
+extern int jffs2_init_acl_pre(struct inode *, struct inode *, int *);
+extern int jffs2_init_acl_post(struct inode *);
 extern void jffs2_clear_acl(struct jffs2_inode_info *);
 
 extern struct xattr_handler jffs2_acl_access_xattr_handler;
@@ -39,10 +40,11 @@ extern struct xattr_handler jffs2_acl_default_xattr_handler;
 
 #else
 
-#define jffs2_get_acl(inode, type)      (NULL)
-#define jffs2_permission NULL
-#define jffs2_acl_chmod(inode)          (0)
-#define jffs2_init_acl(inode,dir)       (0)
+#define jffs2_get_acl(inode, type)              (NULL)
+#define jffs2_permission                        (NULL)
+#define jffs2_acl_chmod(inode)                  (0)
+#define jffs2_init_acl_pre(dir_i,inode,mode)    (0)
+#define jffs2_init_acl_post(inode)              (0)
 #define jffs2_clear_acl(f)
 
 #endif  /* CONFIG_JFFS2_FS_POSIX_ACL */