[PATCH 22/89] sched/headers: Move 'struct user_struct' definition and APIs to the new <linux/sched/user.h> header

[Ingo Molnar <mingo@kernel.org>]

'struct user_struct' was added to sched.h historically, but it's actually
entirely independent of task_struct and of scheduler details, so move
it to its own header.

Fix up .c files using those facilities.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 block/ioprio.c               |  1 +
 include/linux/cred.h         |  2 +-
 include/linux/sched.h        | 57 ---------------------------------------------------------
 include/linux/sched/user.h   | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ipc/mqueue.c                 |  1 +
 kernel/fork.c                |  1 +
 kernel/signal.c              |  1 +
 kernel/user.c                |  1 +
 mm/mlock.c                   |  1 +
 net/core/scm.c               |  1 +
 security/keys/process_keys.c |  1 +
 11 files changed, 73 insertions(+), 58 deletions(-)

diff --git a/block/ioprio.c b/block/ioprio.c
index 01b8116298a1..f68f31476a33 100644
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -25,6 +25,7 @@
 #include <linux/ioprio.h>
 #include <linux/blkdev.h>
 #include <linux/capability.h>
+#include <linux/sched/user.h>
 #include <linux/syscalls.h>
 #include <linux/security.h>
 #include <linux/pid_namespace.h>
diff --git a/include/linux/cred.h b/include/linux/cred.h
index f0e70a1bb3ac..045d33e48069 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -18,8 +18,8 @@
 #include <linux/selinux.h>
 #include <linux/atomic.h>
 #include <linux/uidgid.h>
+#include <linux/sched/user.h>
 
-struct user_struct;
 struct cred;
 struct inode;
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5c9b06947914..f8cbe401181c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -353,7 +353,6 @@ extern void io_schedule(void);
 void __noreturn do_task_dead(void);
 
 struct nsproxy;
-struct user_namespace;
 
 #ifdef CONFIG_MMU
 extern void arch_pick_mmap_layout(struct mm_struct *mm);
@@ -485,53 +484,6 @@ struct thread_group_cputimer {
 #include <linux/rwsem.h>
 struct autogroup;
 
-/*
- * Some day this will be a full-fledged user tracking system..
- */
-struct user_struct {
-	atomic_t __count;	/* reference count */
-	atomic_t processes;	/* How many processes does this user have? */
-	atomic_t sigpending;	/* How many pending signals does this user have? */
-#ifdef CONFIG_INOTIFY_USER
-	atomic_t inotify_watches; /* How many inotify watches does this user have? */
-	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
-#endif
-#ifdef CONFIG_FANOTIFY
-	atomic_t fanotify_listeners;
-#endif
-#ifdef CONFIG_EPOLL
-	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
-#endif
-#ifdef CONFIG_POSIX_MQUEUE
-	/* protected by mq_lock	*/
-	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
-#endif
-	unsigned long locked_shm; /* How many pages of mlocked shm ? */
-	unsigned long unix_inflight;	/* How many files in flight in unix sockets */
-	atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
-
-#ifdef CONFIG_KEYS
-	struct key *uid_keyring;	/* UID specific keyring */
-	struct key *session_keyring;	/* UID's default session keyring */
-#endif
-
-	/* Hash table maintenance information */
-	struct hlist_node uidhash_node;
-	kuid_t uid;
-
-#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
-	atomic_long_t locked_vm;
-#endif
-};
-
-extern int uids_sysfs_init(void);
-
-extern struct user_struct *find_user(kuid_t);
-
-extern struct user_struct root_user;
-#define INIT_USER (&root_user)
-
-
 struct backing_dev_info;
 struct reclaim_state;
 
@@ -1917,15 +1869,6 @@ extern struct task_struct *find_task_by_vpid(pid_t nr);
 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
 		struct pid_namespace *ns);
 
-/* per-UID process charging. */
-extern struct user_struct * alloc_uid(kuid_t);
-static inline struct user_struct *get_uid(struct user_struct *u)
-{
-	atomic_inc(&u->__count);
-	return u;
-}
-extern void free_uid(struct user_struct *);
-
 #include <asm/current.h>
 
 extern void xtime_update(unsigned long ticks);
diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h
new file mode 100644
index 000000000000..7b615b61a0dc
--- /dev/null
+++ b/include/linux/sched/user.h
@@ -0,0 +1,64 @@
+#ifndef _LINUX_SCHED_USER_H
+#define _LINUX_SCHED_USER_H
+
+#include <linux/uidgid.h>
+
+struct key;
+
+/*
+ * Some day this will be a full-fledged user tracking system..
+ */
+struct user_struct {
+	atomic_t __count;	/* reference count */
+	atomic_t processes;	/* How many processes does this user have? */
+	atomic_t sigpending;	/* How many pending signals does this user have? */
+#ifdef CONFIG_INOTIFY_USER
+	atomic_t inotify_watches; /* How many inotify watches does this user have? */
+	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
+#endif
+#ifdef CONFIG_FANOTIFY
+	atomic_t fanotify_listeners;
+#endif
+#ifdef CONFIG_EPOLL
+	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
+#endif
+#ifdef CONFIG_POSIX_MQUEUE
+	/* protected by mq_lock	*/
+	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
+#endif
+	unsigned long locked_shm; /* How many pages of mlocked shm ? */
+	unsigned long unix_inflight;	/* How many files in flight in unix sockets */
+	atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
+
+#ifdef CONFIG_KEYS
+	struct key *uid_keyring;	/* UID specific keyring */
+	struct key *session_keyring;	/* UID's default session keyring */
+#endif
+
+	/* Hash table maintenance information */
+	struct hlist_node uidhash_node;
+	kuid_t uid;
+
+#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
+	atomic_long_t locked_vm;
+#endif
+};
+
+extern int uids_sysfs_init(void);
+
+extern struct user_struct *find_user(kuid_t);
+
+extern struct user_struct root_user;
+#define INIT_USER (&root_user)
+
+
+/* per-UID process charging. */
+extern struct user_struct * alloc_uid(kuid_t);
+static inline struct user_struct *get_uid(struct user_struct *u)
+{
+	atomic_inc(&u->__count);
+	return u;
+}
+extern void free_uid(struct user_struct *);
+
+#endif /* _LINUX_SCHED_USER_H */
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 318d618eac81..3a99c0b41198 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -37,6 +37,7 @@
 #include <linux/slab.h>
 #include <linux/sched/wake_q.h>
 #include <linux/sched/signal.h>
+#include <linux/sched/user.h>
 
 #include <net/sock.h>
 #include "util.h"
diff --git a/kernel/fork.c b/kernel/fork.c
index ab86fd8667d8..1c6916090277 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -15,6 +15,7 @@
 #include <linux/sched/autogroup.h>
 #include <linux/sched/mm.h>
 #include <linux/sched/coredump.h>
+#include <linux/sched/user.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
 #include <linux/module.h>
diff --git a/kernel/signal.c b/kernel/signal.c
index 13f9def8b24a..08bba8751c0e 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -14,6 +14,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/fs.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
diff --git a/kernel/user.c b/kernel/user.c
index b069ccbfb0b0..00281add65b2 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/key.h>
+#include <linux/sched/user.h>
 #include <linux/interrupt.h>
 #include <linux/export.h>
 #include <linux/user_namespace.h>
diff --git a/mm/mlock.c b/mm/mlock.c
index cdbed8aaa426..1050511f8b2b 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -8,6 +8,7 @@
 #include <linux/capability.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
+#include <linux/sched/user.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
 #include <linux/pagemap.h>
diff --git a/net/core/scm.c b/net/core/scm.c
index d8820438ba37..f201d3c5707b 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -14,6 +14,7 @@
 #include <linux/capability.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/mm.h>
 #include <linux/kernel.h>
 #include <linux/stat.h>
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 918cddcd4516..b6fdd22205b1 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/user.h>
 #include <linux/keyctl.h>
 #include <linux/fs.h>
 #include <linux/err.h>
-- 
2.7.4