^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * fs/ioprio.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2004 Jens Axboe <axboe@kernel.dk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Helper functions for setting/querying io priorities of processes. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * system calls closely mimmick getpriority/setpriority, see the man page for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * those. The prio argument is a composite of prio class and prio data, where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * the data argument has meaning within that class. The standard scheduling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * classes have 8 distinct prio levels, with 0 being the highest prio and 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * being the lowest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * IOW, setting BE scheduling class with prio 2 is done ala:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * unsigned int prio = (IOPRIO_CLASS_BE << IOPRIO_CLASS_SHIFT) | 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * ioprio_set(PRIO_PROCESS, pid, prio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * See also Documentation/block/ioprio.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/ioprio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/sched/user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/pid_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int set_task_ioprio(struct task_struct *task, int ioprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct io_context *ioc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) const struct cred *cred = current_cred(), *tcred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) tcred = __task_cred(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!uid_eq(tcred->uid, cred->euid) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) err = security_task_setioprio(task, ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (ioc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ioc->ioprio = ioprio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) put_io_context(ioc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) EXPORT_SYMBOL_GPL(set_task_ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int ioprio_check_cap(int ioprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int class = IOPRIO_PRIO_CLASS(ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int data = IOPRIO_PRIO_DATA(ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) switch (class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) case IOPRIO_CLASS_RT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * Originally this only checked for CAP_SYS_ADMIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * which was implicitly allowed for pid 0 by security
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * modules such as SELinux. Make sure we check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * CAP_SYS_ADMIN first to avoid a denial/avc for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * possibly missing CAP_SYS_NICE permission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* rt has prio field too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) case IOPRIO_CLASS_BE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (data >= IOPRIO_BE_NR || data < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case IOPRIO_CLASS_IDLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) case IOPRIO_CLASS_NONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct task_struct *p, *g;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct user_struct *user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct pid *pgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kuid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = ioprio_check_cap(ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ret = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) switch (which) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) case IOPRIO_WHO_PROCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) p = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) p = find_task_by_vpid(who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ret = set_task_ioprio(p, ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) case IOPRIO_WHO_PGRP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) pgrp = task_pgrp(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) pgrp = find_vpid(who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ret = set_task_ioprio(p, ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) case IOPRIO_WHO_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) uid = make_kuid(current_user_ns(), who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!uid_valid(uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) user = current_user();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) user = find_user(uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (!user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) for_each_process_thread(g, p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (!uid_eq(task_uid(p), uid) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) !task_pid_vnr(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ret = set_task_ioprio(p, ioprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) goto free_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) free_uid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) free_uid(user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int get_task_ioprio(struct task_struct *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ret = security_task_getioprio(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ret = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, IOPRIO_NORM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) task_lock(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (p->io_context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) ret = p->io_context->ioprio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) task_unlock(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int ioprio_best(unsigned short aprio, unsigned short bprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (!ioprio_valid(aprio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) aprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (!ioprio_valid(bprio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) bprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return min(aprio, bprio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct task_struct *g, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct user_struct *user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct pid *pgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) kuid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int ret = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int tmpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) switch (which) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) case IOPRIO_WHO_PROCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) p = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) p = find_task_by_vpid(who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ret = get_task_ioprio(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) case IOPRIO_WHO_PGRP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) pgrp = task_pgrp(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) pgrp = find_vpid(who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) read_lock(&tasklist_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) tmpio = get_task_ioprio(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (tmpio < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (ret == -ESRCH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ret = tmpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) ret = ioprio_best(ret, tmpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) read_unlock(&tasklist_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) case IOPRIO_WHO_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) uid = make_kuid(current_user_ns(), who);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (!who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) user = current_user();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) user = find_user(uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (!user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) for_each_process_thread(g, p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (!uid_eq(task_uid(p), user->uid) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) !task_pid_vnr(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) tmpio = get_task_ioprio(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (tmpio < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (ret == -ESRCH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ret = tmpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) ret = ioprio_best(ret, tmpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (who)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) free_uid(user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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