block: move ioprio.c from fs/ to block/

Like commit f9c78b2b, move this block related file outside
of fs/ and into the core block directory, block/.

Signed-off-by: Jens Axboe <axboe@fb.com>

2 files changed, 1 insertions, 242 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 1ed9eab5e0a9..4030cbfbc9af 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -14,7 +14,7 @@ obj-y :=	open.o read_write.o file_table.o super.o \
 		stack.o fs_struct.o statfs.o
 
 ifeq ($(CONFIG_BLOCK),y)
-obj-y +=	buffer.o block_dev.o direct-io.o mpage.o ioprio.o
+obj-y +=	buffer.o block_dev.o direct-io.o mpage.o
 else
 obj-y +=	no-block.o
 endif
diff --git a/fs/ioprio.c b/fs/ioprio.c
deleted file mode 100644
index e50170ca7c33..000000000000
--- a/fs/ioprio.c
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * fs/ioprio.c
- *
- * Copyright (C) 2004 Jens Axboe <axboe@kernel.dk>
- *
- * Helper functions for setting/querying io priorities of processes. The
- * system calls closely mimmick getpriority/setpriority, see the man page for
- * those. The prio argument is a composite of prio class and prio data, where
- * the data argument has meaning within that class. The standard scheduling
- * classes have 8 distinct prio levels, with 0 being the highest prio and 7
- * being the lowest.
- *
- * IOW, setting BE scheduling class with prio 2 is done ala:
- *
- * unsigned int prio = (IOPRIO_CLASS_BE << IOPRIO_CLASS_SHIFT) | 2;
- *
- * ioprio_set(PRIO_PROCESS, pid, prio);
- *
- * See also Documentation/block/ioprio.txt
- *
- */
-#include <linux/gfp.h>
-#include <linux/kernel.h>
-#include <linux/export.h>
-#include <linux/ioprio.h>
-#include <linux/blkdev.h>
-#include <linux/capability.h>
-#include <linux/syscalls.h>
-#include <linux/security.h>
-#include <linux/pid_namespace.h>
-
-int set_task_ioprio(struct task_struct *task, int ioprio)
-{
-	int err;
-	struct io_context *ioc;
-	const struct cred *cred = current_cred(), *tcred;
-
-	rcu_read_lock();
-	tcred = __task_cred(task);
-	if (!uid_eq(tcred->uid, cred->euid) &&
-	    !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
-		rcu_read_unlock();
-		return -EPERM;
-	}
-	rcu_read_unlock();
-
-	err = security_task_setioprio(task, ioprio);
-	if (err)
-		return err;
-
-	ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
-	if (ioc) {
-		ioc->ioprio = ioprio;
-		put_io_context(ioc);
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(set_task_ioprio);
-
-SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
-{
-	int class = IOPRIO_PRIO_CLASS(ioprio);
-	int data = IOPRIO_PRIO_DATA(ioprio);
-	struct task_struct *p, *g;
-	struct user_struct *user;
-	struct pid *pgrp;
-	kuid_t uid;
-	int ret;
-
-	switch (class) {
-		case IOPRIO_CLASS_RT:
-			if (!capable(CAP_SYS_ADMIN))
-				return -EPERM;
-			/* fall through, rt has prio field too */
-		case IOPRIO_CLASS_BE:
-			if (data >= IOPRIO_BE_NR || data < 0)
-				return -EINVAL;
-
-			break;
-		case IOPRIO_CLASS_IDLE:
-			break;
-		case IOPRIO_CLASS_NONE:
-			if (data)
-				return -EINVAL;
-			break;
-		default:
-			return -EINVAL;
-	}
-
-	ret = -ESRCH;
-	rcu_read_lock();
-	switch (which) {
-		case IOPRIO_WHO_PROCESS:
-			if (!who)
-				p = current;
-			else
-				p = find_task_by_vpid(who);
-			if (p)
-				ret = set_task_ioprio(p, ioprio);
-			break;
-		case IOPRIO_WHO_PGRP:
-			if (!who)
-				pgrp = task_pgrp(current);
-			else
-				pgrp = find_vpid(who);
-			do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
-				ret = set_task_ioprio(p, ioprio);
-				if (ret)
-					break;
-			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
-			break;
-		case IOPRIO_WHO_USER:
-			uid = make_kuid(current_user_ns(), who);
-			if (!uid_valid(uid))
-				break;
-			if (!who)
-				user = current_user();
-			else
-				user = find_user(uid);
-
-			if (!user)
-				break;
-
-			do_each_thread(g, p) {
-				if (!uid_eq(task_uid(p), uid))
-					continue;
-				ret = set_task_ioprio(p, ioprio);
-				if (ret)
-					goto free_uid;
-			} while_each_thread(g, p);
-free_uid:
-			if (who)
-				free_uid(user);
-			break;
-		default:
-			ret = -EINVAL;
-	}
-
-	rcu_read_unlock();
-	return ret;
-}
-
-static int get_task_ioprio(struct task_struct *p)
-{
-	int ret;
-
-	ret = security_task_getioprio(p);
-	if (ret)
-		goto out;
-	ret = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, IOPRIO_NORM);
-	if (p->io_context)
-		ret = p->io_context->ioprio;
-out:
-	return ret;
-}
-
-int ioprio_best(unsigned short aprio, unsigned short bprio)
-{
-	unsigned short aclass = IOPRIO_PRIO_CLASS(aprio);
-	unsigned short bclass = IOPRIO_PRIO_CLASS(bprio);
-
-	if (aclass == IOPRIO_CLASS_NONE)
-		aclass = IOPRIO_CLASS_BE;
-	if (bclass == IOPRIO_CLASS_NONE)
-		bclass = IOPRIO_CLASS_BE;
-
-	if (aclass == bclass)
-		return min(aprio, bprio);
-	if (aclass > bclass)
-		return bprio;
-	else
-		return aprio;
-}
-
-SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
-{
-	struct task_struct *g, *p;
-	struct user_struct *user;
-	struct pid *pgrp;
-	kuid_t uid;
-	int ret = -ESRCH;
-	int tmpio;
-
-	rcu_read_lock();
-	switch (which) {
-		case IOPRIO_WHO_PROCESS:
-			if (!who)
-				p = current;
-			else
-				p = find_task_by_vpid(who);
-			if (p)
-				ret = get_task_ioprio(p);
-			break;
-		case IOPRIO_WHO_PGRP:
-			if (!who)
-				pgrp = task_pgrp(current);
-			else
-				pgrp = find_vpid(who);
-			do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
-				tmpio = get_task_ioprio(p);
-				if (tmpio < 0)
-					continue;
-				if (ret == -ESRCH)
-					ret = tmpio;
-				else
-					ret = ioprio_best(ret, tmpio);
-			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
-			break;
-		case IOPRIO_WHO_USER:
-			uid = make_kuid(current_user_ns(), who);
-			if (!who)
-				user = current_user();
-			else
-				user = find_user(uid);
-
-			if (!user)
-				break;
-
-			do_each_thread(g, p) {
-				if (!uid_eq(task_uid(p), user->uid))
-					continue;
-				tmpio = get_task_ioprio(p);
-				if (tmpio < 0)
-					continue;
-				if (ret == -ESRCH)
-					ret = tmpio;
-				else
-					ret = ioprio_best(ret, tmpio);
-			} while_each_thread(g, p);
-
-			if (who)
-				free_uid(user);
-			break;
-		default:
-			ret = -EINVAL;
-	}
-
-	rcu_read_unlock();
-	return ret;
-}