diff options
Diffstat (limited to 'fs/ioprio.c')
| -rw-r--r-- | fs/ioprio.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c deleted file mode 100644 index d1c1f2b2c9d..00000000000 --- a/fs/ioprio.c +++ /dev/null @@ -1,174 +0,0 @@ -/* - * fs/ioprio.c - * - * Copyright (C) 2004 Jens Axboe <axboe@suse.de> - * - * 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/kernel.h> -#include <linux/ioprio.h> -#include <linux/blkdev.h> - -static int set_task_ioprio(struct task_struct *task, int ioprio) -{ - struct io_context *ioc; - - if (task->uid != current->euid && - task->uid != current->uid && !capable(CAP_SYS_NICE)) - return -EPERM; - - task_lock(task); - - task->ioprio = ioprio; - - ioc = task->io_context; - if (ioc && ioc->set_ioprio) - ioc->set_ioprio(ioc, ioprio); - - task_unlock(task); - return 0; -} - -asmlinkage long sys_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; - 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: - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - break; - default: - return -EINVAL; - } - - ret = -ESRCH; - read_lock_irq(&tasklist_lock); - switch (which) { - case IOPRIO_WHO_PROCESS: - if (!who) - p = current; - else - p = find_task_by_pid(who); - if (p) - ret = set_task_ioprio(p, ioprio); - break; - case IOPRIO_WHO_PGRP: - if (!who) - who = process_group(current); - do_each_task_pid(who, PIDTYPE_PGID, p) { - ret = set_task_ioprio(p, ioprio); - if (ret) - break; - } while_each_task_pid(who, PIDTYPE_PGID, p); - break; - case IOPRIO_WHO_USER: - if (!who) - user = current->user; - else - user = find_user(who); - - if (!user) - break; - - do_each_thread(g, p) { - if (p->uid != who) - continue; - ret = set_task_ioprio(p, ioprio); - if (ret) - break; - } while_each_thread(g, p); - - if (who) - free_uid(user); - break; - default: - ret = -EINVAL; - } - - read_unlock_irq(&tasklist_lock); - return ret; -} - -asmlinkage long sys_ioprio_get(int which, int who) -{ - struct task_struct *g, *p; - struct user_struct *user; - int ret = -ESRCH; - - read_lock_irq(&tasklist_lock); - switch (which) { - case IOPRIO_WHO_PROCESS: - if (!who) - p = current; - else - p = find_task_by_pid(who); - if (p) - ret = p->ioprio; - break; - case IOPRIO_WHO_PGRP: - if (!who) - who = process_group(current); - do_each_task_pid(who, PIDTYPE_PGID, p) { - if (ret == -ESRCH) - ret = p->ioprio; - else - ret = ioprio_best(ret, p->ioprio); - } while_each_task_pid(who, PIDTYPE_PGID, p); - break; - case IOPRIO_WHO_USER: - if (!who) - user = current->user; - else - user = find_user(who); - - if (!user) - break; - - do_each_thread(g, p) { - if (p->uid != user->uid) - continue; - if (ret == -ESRCH) - ret = p->ioprio; - else - ret = ioprio_best(ret, p->ioprio); - } while_each_thread(g, p); - - if (who) - free_uid(user); - break; - default: - ret = -EINVAL; - } - - read_unlock_irq(&tasklist_lock); - return ret; -} - |