CRED: Use creds in file structs

Attach creds to file structs and discard f_uid/f_gid.

file_operations::open() methods (such as hppfs_open()) should use file->f_cred
rather than current_cred().  At the moment file->f_cred will be current_cred()
at this point.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/file_table.c b/fs/file_table.c
index bc4563fe791d..0fbcacc3ea75 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -36,7 +36,9 @@ static struct percpu_counter nr_files __cacheline_aligned_in_smp;
 
 static inline void file_free_rcu(struct rcu_head *head)
 {
-        struct file *f =  container_of(head, struct file, f_u.fu_rcuhead);
+        struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+
+        put_cred(f->f_cred);
         kmem_cache_free(filp_cachep, f);
 }
 
@@ -121,8 +123,7 @@ struct file *get_empty_filp(void)
         INIT_LIST_HEAD(&f->f_u.fu_list);
         atomic_long_set(&f->f_count, 1);
         rwlock_init(&f->f_owner.lock);
-        f->f_uid = cred->fsuid;
-        f->f_gid = cred->fsgid;
+        f->f_cred = get_cred(cred);
         eventpoll_init_file(f);
         /* f->f_version: 0 */
         return f;