CRED: Wrap task credential accesses in the filesystem subsystem

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ioprio.c b/fs/ioprio.c
index da3cc460d4df..68d2cd807118 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -32,8 +32,8 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
         int err;
         struct io_context *ioc;
 
-        if (task->uid != current->euid &&
-            task->uid != current->uid && !capable(CAP_SYS_NICE))
+        if (task->uid != current_euid() &&
+            task->uid != current_uid() && !capable(CAP_SYS_NICE))
                 return -EPERM;
 
         err = security_task_setioprio(task, ioprio);