io_uring: move SQPOLL thread io-wq forked worker
Don't use a kthread for SQPOLL, use a forked worker just like the io-wq workers. With that done, we can drop the various context grabbing we do for SQPOLL, it already has everything it needs. Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
Родитель
843bbfd49f
Коммит
37d1e2e364
473
fs/io_uring.c
473
fs/io_uring.c
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@ -57,7 +57,6 @@
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#include <linux/mman.h>
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#include <linux/percpu.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/blkdev.h>
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#include <linux/bvec.h>
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#include <linux/net.h>
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@ -254,6 +253,11 @@ struct io_restriction {
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bool registered;
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};
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enum {
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IO_SQ_THREAD_SHOULD_STOP = 0,
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IO_SQ_THREAD_SHOULD_PARK,
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};
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struct io_sq_data {
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refcount_t refs;
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struct mutex lock;
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@ -267,6 +271,13 @@ struct io_sq_data {
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struct wait_queue_head wait;
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unsigned sq_thread_idle;
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int sq_cpu;
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pid_t task_pid;
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unsigned long state;
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struct completion startup;
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struct completion completion;
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struct completion exited;
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};
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#define IO_IOPOLL_BATCH 8
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@ -367,18 +378,13 @@ struct io_ring_ctx {
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struct io_rings *rings;
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/*
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* For SQPOLL usage - we hold a reference to the parent task, so we
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* have access to the ->files
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* For SQPOLL usage
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*/
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struct task_struct *sqo_task;
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/* Only used for accounting purposes */
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struct mm_struct *mm_account;
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#ifdef CONFIG_BLK_CGROUP
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struct cgroup_subsys_state *sqo_blkcg_css;
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#endif
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struct io_sq_data *sq_data; /* if using sq thread polling */
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struct wait_queue_head sqo_sq_wait;
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@ -398,13 +404,6 @@ struct io_ring_ctx {
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struct user_struct *user;
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const struct cred *creds;
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#ifdef CONFIG_AUDIT
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kuid_t loginuid;
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unsigned int sessionid;
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#endif
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struct completion ref_comp;
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struct completion sq_thread_comp;
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@ -989,6 +988,7 @@ static const struct io_op_def io_op_defs[] = {
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static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
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struct task_struct *task,
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struct files_struct *files);
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static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx);
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static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node);
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static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node(
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struct io_ring_ctx *ctx);
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@ -1100,118 +1100,6 @@ static bool io_match_task(struct io_kiocb *head,
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return false;
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}
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static void io_sq_thread_drop_mm_files(void)
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{
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struct files_struct *files = current->files;
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struct mm_struct *mm = current->mm;
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if (mm) {
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kthread_unuse_mm(mm);
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mmput(mm);
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current->mm = NULL;
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}
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if (files) {
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struct nsproxy *nsproxy = current->nsproxy;
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task_lock(current);
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current->files = NULL;
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current->nsproxy = NULL;
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task_unlock(current);
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put_files_struct(files);
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put_nsproxy(nsproxy);
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}
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}
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static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx)
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{
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if (!current->files) {
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struct files_struct *files;
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struct nsproxy *nsproxy;
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task_lock(ctx->sqo_task);
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files = ctx->sqo_task->files;
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if (!files) {
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task_unlock(ctx->sqo_task);
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return -EOWNERDEAD;
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}
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atomic_inc(&files->count);
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get_nsproxy(ctx->sqo_task->nsproxy);
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nsproxy = ctx->sqo_task->nsproxy;
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task_unlock(ctx->sqo_task);
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task_lock(current);
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current->files = files;
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current->nsproxy = nsproxy;
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task_unlock(current);
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}
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return 0;
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}
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static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx)
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{
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struct mm_struct *mm;
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if (current->mm)
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return 0;
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task_lock(ctx->sqo_task);
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mm = ctx->sqo_task->mm;
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if (unlikely(!mm || !mmget_not_zero(mm)))
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mm = NULL;
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task_unlock(ctx->sqo_task);
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if (mm) {
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kthread_use_mm(mm);
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return 0;
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}
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return -EFAULT;
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}
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static int __io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx,
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struct io_kiocb *req)
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{
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int ret;
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ret = __io_sq_thread_acquire_mm(ctx);
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if (unlikely(ret))
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return ret;
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ret = __io_sq_thread_acquire_files(ctx);
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if (unlikely(ret))
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return ret;
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return 0;
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}
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static inline int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx,
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struct io_kiocb *req)
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{
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if (!(ctx->flags & IORING_SETUP_SQPOLL))
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return 0;
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return __io_sq_thread_acquire_mm_files(ctx, req);
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}
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static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx,
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struct cgroup_subsys_state **cur_css)
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{
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#ifdef CONFIG_BLK_CGROUP
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/* puts the old one when swapping */
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if (*cur_css != ctx->sqo_blkcg_css) {
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kthread_associate_blkcg(ctx->sqo_blkcg_css);
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*cur_css = ctx->sqo_blkcg_css;
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}
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#endif
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}
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static void io_sq_thread_unassociate_blkcg(void)
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{
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#ifdef CONFIG_BLK_CGROUP
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kthread_associate_blkcg(NULL);
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#endif
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}
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static inline void req_set_fail_links(struct io_kiocb *req)
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{
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if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK)
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@ -2132,15 +2020,11 @@ static void __io_req_task_submit(struct io_kiocb *req)
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/* ctx stays valid until unlock, even if we drop all ours ctx->refs */
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mutex_lock(&ctx->uring_lock);
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if (!ctx->sqo_dead && !(current->flags & PF_EXITING) &&
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!io_sq_thread_acquire_mm_files(ctx, req))
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if (!ctx->sqo_dead && !(current->flags & PF_EXITING))
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__io_queue_sqe(req);
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else
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__io_req_task_cancel(req, -EFAULT);
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mutex_unlock(&ctx->uring_lock);
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if (ctx->flags & IORING_SETUP_SQPOLL)
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io_sq_thread_drop_mm_files();
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}
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static void io_req_task_submit(struct callback_head *cb)
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@ -2604,7 +2488,6 @@ static bool io_rw_reissue(struct io_kiocb *req)
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{
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#ifdef CONFIG_BLOCK
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umode_t mode = file_inode(req->file)->i_mode;
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int ret;
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if (!S_ISBLK(mode) && !S_ISREG(mode))
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return false;
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@ -2613,9 +2496,7 @@ static bool io_rw_reissue(struct io_kiocb *req)
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lockdep_assert_held(&req->ctx->uring_lock);
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ret = io_sq_thread_acquire_mm_files(req->ctx, req);
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if (!ret && io_resubmit_prep(req)) {
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if (io_resubmit_prep(req)) {
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refcount_inc(&req->refs);
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io_queue_async_work(req);
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return true;
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@ -6461,9 +6342,6 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
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if (unlikely(req->opcode >= IORING_OP_LAST))
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return -EINVAL;
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if (unlikely(io_sq_thread_acquire_mm_files(ctx, req)))
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return -EFAULT;
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if (unlikely(!io_check_restriction(ctx, req, sqe_flags)))
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return -EACCES;
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@ -6779,71 +6657,97 @@ static void io_sqd_init_new(struct io_sq_data *sqd)
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io_sqd_update_thread_idle(sqd);
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}
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static bool io_sq_thread_should_stop(struct io_sq_data *sqd)
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{
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return test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state);
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}
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static bool io_sq_thread_should_park(struct io_sq_data *sqd)
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{
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return test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
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}
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static void io_sq_thread_parkme(struct io_sq_data *sqd)
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{
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for (;;) {
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/*
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* TASK_PARKED is a special state; we must serialize against
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* possible pending wakeups to avoid store-store collisions on
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* task->state.
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*
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* Such a collision might possibly result in the task state
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* changin from TASK_PARKED and us failing the
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* wait_task_inactive() in kthread_park().
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*/
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set_special_state(TASK_PARKED);
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if (!test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state))
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break;
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/*
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* Thread is going to call schedule(), do not preempt it,
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* or the caller of kthread_park() may spend more time in
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* wait_task_inactive().
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*/
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preempt_disable();
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complete(&sqd->completion);
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schedule_preempt_disabled();
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preempt_enable();
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}
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__set_current_state(TASK_RUNNING);
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}
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static int io_sq_thread(void *data)
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{
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struct cgroup_subsys_state *cur_css = NULL;
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struct files_struct *old_files = current->files;
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struct nsproxy *old_nsproxy = current->nsproxy;
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const struct cred *old_cred = NULL;
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struct io_sq_data *sqd = data;
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struct io_ring_ctx *ctx;
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unsigned long timeout = 0;
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char buf[TASK_COMM_LEN];
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DEFINE_WAIT(wait);
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task_lock(current);
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current->files = NULL;
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current->nsproxy = NULL;
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task_unlock(current);
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sprintf(buf, "iou-sqp-%d", sqd->task_pid);
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set_task_comm(current, buf);
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sqd->thread = current;
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current->pf_io_worker = NULL;
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while (!kthread_should_stop()) {
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if (sqd->sq_cpu != -1)
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set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu));
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else
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set_cpus_allowed_ptr(current, cpu_online_mask);
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current->flags |= PF_NO_SETAFFINITY;
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complete(&sqd->completion);
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wait_for_completion(&sqd->startup);
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while (!io_sq_thread_should_stop(sqd)) {
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int ret;
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bool cap_entries, sqt_spin, needs_sched;
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/*
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* Any changes to the sqd lists are synchronized through the
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* kthread parking. This synchronizes the thread vs users,
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* thread parking. This synchronizes the thread vs users,
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* the users are synchronized on the sqd->ctx_lock.
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*/
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if (kthread_should_park()) {
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kthread_parkme();
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/*
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* When sq thread is unparked, in case the previous park operation
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* comes from io_put_sq_data(), which means that sq thread is going
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* to be stopped, so here needs to have a check.
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*/
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if (kthread_should_stop())
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break;
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if (io_sq_thread_should_park(sqd)) {
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io_sq_thread_parkme(sqd);
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continue;
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}
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if (unlikely(!list_empty(&sqd->ctx_new_list))) {
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io_sqd_init_new(sqd);
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timeout = jiffies + sqd->sq_thread_idle;
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}
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if (fatal_signal_pending(current))
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break;
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sqt_spin = false;
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cap_entries = !list_is_singular(&sqd->ctx_list);
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list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
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if (current->cred != ctx->creds) {
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if (old_cred)
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revert_creds(old_cred);
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old_cred = override_creds(ctx->creds);
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}
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io_sq_thread_associate_blkcg(ctx, &cur_css);
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#ifdef CONFIG_AUDIT
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current->loginuid = ctx->loginuid;
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current->sessionid = ctx->sessionid;
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#endif
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ret = __io_sq_thread(ctx, cap_entries);
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if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list)))
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sqt_spin = true;
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io_sq_thread_drop_mm_files();
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}
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if (sqt_spin || !time_after(jiffies, timeout)) {
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io_run_task_work();
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io_sq_thread_drop_mm_files();
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cond_resched();
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if (sqt_spin)
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timeout = jiffies + sqd->sq_thread_idle;
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@ -6864,7 +6768,7 @@ static int io_sq_thread(void *data)
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}
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}
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if (needs_sched && !kthread_should_park()) {
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if (needs_sched && !io_sq_thread_should_park(sqd)) {
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list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
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io_ring_set_wakeup_flag(ctx);
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@ -6877,22 +6781,21 @@ static int io_sq_thread(void *data)
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timeout = jiffies + sqd->sq_thread_idle;
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}
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list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
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io_uring_cancel_sqpoll(ctx);
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io_run_task_work();
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io_sq_thread_drop_mm_files();
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if (cur_css)
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io_sq_thread_unassociate_blkcg();
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if (old_cred)
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revert_creds(old_cred);
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/*
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* Clear thread under lock so that concurrent parks work correctly
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*/
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complete_all(&sqd->completion);
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mutex_lock(&sqd->lock);
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sqd->thread = NULL;
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mutex_unlock(&sqd->lock);
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task_lock(current);
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current->files = old_files;
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current->nsproxy = old_nsproxy;
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task_unlock(current);
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kthread_parkme();
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return 0;
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complete(&sqd->exited);
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do_exit(0);
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}
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struct io_wait_queue {
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|
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@ -7182,20 +7085,73 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
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return 0;
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}
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static void io_sq_thread_unpark(struct io_sq_data *sqd)
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__releases(&sqd->lock)
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{
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if (!sqd->thread)
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return;
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if (sqd->thread == current)
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return;
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clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
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wake_up_state(sqd->thread, TASK_PARKED);
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mutex_unlock(&sqd->lock);
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}
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static bool io_sq_thread_park(struct io_sq_data *sqd)
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__acquires(&sqd->lock)
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{
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if (sqd->thread == current)
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return true;
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mutex_lock(&sqd->lock);
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if (!sqd->thread) {
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mutex_unlock(&sqd->lock);
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return false;
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}
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set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
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wake_up_process(sqd->thread);
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wait_for_completion(&sqd->completion);
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return true;
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}
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static void io_sq_thread_stop(struct io_sq_data *sqd)
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{
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if (!sqd->thread)
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return;
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set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state);
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WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state));
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wake_up_process(sqd->thread);
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wait_for_completion(&sqd->exited);
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}
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static void io_put_sq_data(struct io_sq_data *sqd)
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{
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if (refcount_dec_and_test(&sqd->refs)) {
|
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/*
|
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* The park is a bit of a work-around, without it we get
|
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* warning spews on shutdown with SQPOLL set and affinity
|
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* set to a single CPU.
|
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*/
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io_sq_thread_stop(sqd);
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kfree(sqd);
|
||||
}
|
||||
}
|
||||
|
||||
static void io_sq_thread_finish(struct io_ring_ctx *ctx)
|
||||
{
|
||||
struct io_sq_data *sqd = ctx->sq_data;
|
||||
|
||||
if (sqd) {
|
||||
if (sqd->thread) {
|
||||
kthread_park(sqd->thread);
|
||||
kthread_stop(sqd->thread);
|
||||
wait_for_completion(&ctx->sq_thread_comp);
|
||||
io_sq_thread_park(sqd);
|
||||
}
|
||||
|
||||
kfree(sqd);
|
||||
mutex_lock(&sqd->ctx_lock);
|
||||
list_del(&ctx->sqd_list);
|
||||
io_sqd_update_thread_idle(sqd);
|
||||
mutex_unlock(&sqd->ctx_lock);
|
||||
|
||||
if (sqd->thread)
|
||||
io_sq_thread_unpark(sqd);
|
||||
|
||||
io_put_sq_data(sqd);
|
||||
ctx->sq_data = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -7242,58 +7198,12 @@ static struct io_sq_data *io_get_sq_data(struct io_uring_params *p)
|
|||
mutex_init(&sqd->ctx_lock);
|
||||
mutex_init(&sqd->lock);
|
||||
init_waitqueue_head(&sqd->wait);
|
||||
init_completion(&sqd->startup);
|
||||
init_completion(&sqd->completion);
|
||||
init_completion(&sqd->exited);
|
||||
return sqd;
|
||||
}
|
||||
|
||||
static void io_sq_thread_unpark(struct io_sq_data *sqd)
|
||||
__releases(&sqd->lock)
|
||||
{
|
||||
if (!sqd->thread)
|
||||
return;
|
||||
kthread_unpark(sqd->thread);
|
||||
mutex_unlock(&sqd->lock);
|
||||
}
|
||||
|
||||
static void io_sq_thread_park(struct io_sq_data *sqd)
|
||||
__acquires(&sqd->lock)
|
||||
{
|
||||
if (!sqd->thread)
|
||||
return;
|
||||
mutex_lock(&sqd->lock);
|
||||
kthread_park(sqd->thread);
|
||||
}
|
||||
|
||||
static void io_sq_thread_stop(struct io_ring_ctx *ctx)
|
||||
{
|
||||
struct io_sq_data *sqd = ctx->sq_data;
|
||||
|
||||
if (sqd) {
|
||||
if (sqd->thread) {
|
||||
/*
|
||||
* We may arrive here from the error branch in
|
||||
* io_sq_offload_create() where the kthread is created
|
||||
* without being waked up, thus wake it up now to make
|
||||
* sure the wait will complete.
|
||||
*/
|
||||
wake_up_process(sqd->thread);
|
||||
wait_for_completion(&ctx->sq_thread_comp);
|
||||
|
||||
io_sq_thread_park(sqd);
|
||||
}
|
||||
|
||||
mutex_lock(&sqd->ctx_lock);
|
||||
list_del(&ctx->sqd_list);
|
||||
io_sqd_update_thread_idle(sqd);
|
||||
mutex_unlock(&sqd->ctx_lock);
|
||||
|
||||
if (sqd->thread)
|
||||
io_sq_thread_unpark(sqd);
|
||||
|
||||
io_put_sq_data(sqd);
|
||||
ctx->sq_data = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
#if defined(CONFIG_UNIX)
|
||||
/*
|
||||
* Ensure the UNIX gc is aware of our file set, so we are certain that
|
||||
|
|
@ -7969,17 +7879,20 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
|
|||
if (!cpu_online(cpu))
|
||||
goto err;
|
||||
|
||||
sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd,
|
||||
cpu, "io_uring-sq");
|
||||
sqd->sq_cpu = cpu;
|
||||
} else {
|
||||
sqd->thread = kthread_create(io_sq_thread, sqd,
|
||||
"io_uring-sq");
|
||||
sqd->sq_cpu = -1;
|
||||
}
|
||||
if (IS_ERR(sqd->thread)) {
|
||||
ret = PTR_ERR(sqd->thread);
|
||||
|
||||
sqd->task_pid = current->pid;
|
||||
current->flags |= PF_IO_WORKER;
|
||||
ret = io_wq_fork_thread(io_sq_thread, sqd);
|
||||
current->flags &= ~PF_IO_WORKER;
|
||||
if (ret < 0) {
|
||||
sqd->thread = NULL;
|
||||
goto err;
|
||||
}
|
||||
wait_for_completion(&sqd->completion);
|
||||
ret = io_uring_alloc_task_context(sqd->thread, ctx);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
|
@ -7991,7 +7904,7 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
|
|||
|
||||
return 0;
|
||||
err:
|
||||
io_sq_thread_stop(ctx);
|
||||
io_sq_thread_finish(ctx);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
@ -8000,7 +7913,7 @@ static void io_sq_offload_start(struct io_ring_ctx *ctx)
|
|||
struct io_sq_data *sqd = ctx->sq_data;
|
||||
|
||||
if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread)
|
||||
wake_up_process(sqd->thread);
|
||||
complete(&sqd->startup);
|
||||
}
|
||||
|
||||
static inline void __io_unaccount_mem(struct user_struct *user,
|
||||
|
|
@ -8466,21 +8379,14 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
|
|||
mutex_lock(&ctx->uring_lock);
|
||||
mutex_unlock(&ctx->uring_lock);
|
||||
|
||||
io_sq_thread_stop(ctx);
|
||||
io_sq_thread_finish(ctx);
|
||||
io_sqe_buffers_unregister(ctx);
|
||||
|
||||
if (ctx->sqo_task) {
|
||||
put_task_struct(ctx->sqo_task);
|
||||
ctx->sqo_task = NULL;
|
||||
if (ctx->mm_account) {
|
||||
mmdrop(ctx->mm_account);
|
||||
ctx->mm_account = NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_BLK_CGROUP
|
||||
if (ctx->sqo_blkcg_css)
|
||||
css_put(ctx->sqo_blkcg_css);
|
||||
#endif
|
||||
|
||||
mutex_lock(&ctx->uring_lock);
|
||||
io_sqe_files_unregister(ctx);
|
||||
mutex_unlock(&ctx->uring_lock);
|
||||
|
|
@ -8500,7 +8406,6 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
|
|||
|
||||
percpu_ref_exit(&ctx->refs);
|
||||
free_uid(ctx->user);
|
||||
put_cred(ctx->creds);
|
||||
io_req_caches_free(ctx, NULL);
|
||||
kfree(ctx->cancel_hash);
|
||||
kfree(ctx);
|
||||
|
|
@ -8793,12 +8698,15 @@ static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
|
|||
struct files_struct *files)
|
||||
{
|
||||
struct task_struct *task = current;
|
||||
bool did_park = false;
|
||||
|
||||
if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
|
||||
io_disable_sqo_submit(ctx);
|
||||
task = ctx->sq_data->thread;
|
||||
atomic_inc(&task->io_uring->in_idle);
|
||||
io_sq_thread_park(ctx->sq_data);
|
||||
did_park = io_sq_thread_park(ctx->sq_data);
|
||||
if (did_park) {
|
||||
task = ctx->sq_data->thread;
|
||||
atomic_inc(&task->io_uring->in_idle);
|
||||
}
|
||||
}
|
||||
|
||||
io_cancel_defer_files(ctx, task, files);
|
||||
|
|
@ -8807,7 +8715,7 @@ static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
|
|||
if (!files)
|
||||
io_uring_try_cancel_requests(ctx, task, NULL);
|
||||
|
||||
if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
|
||||
if (did_park) {
|
||||
atomic_dec(&task->io_uring->in_idle);
|
||||
io_sq_thread_unpark(ctx->sq_data);
|
||||
}
|
||||
|
|
@ -8907,14 +8815,17 @@ static s64 tctx_inflight(struct io_uring_task *tctx)
|
|||
|
||||
static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx)
|
||||
{
|
||||
struct io_sq_data *sqd = ctx->sq_data;
|
||||
struct io_uring_task *tctx;
|
||||
s64 inflight;
|
||||
DEFINE_WAIT(wait);
|
||||
|
||||
if (!ctx->sq_data)
|
||||
if (!sqd)
|
||||
return;
|
||||
io_disable_sqo_submit(ctx);
|
||||
if (!io_sq_thread_park(sqd))
|
||||
return;
|
||||
tctx = ctx->sq_data->thread->io_uring;
|
||||
io_disable_sqo_submit(ctx);
|
||||
|
||||
atomic_inc(&tctx->in_idle);
|
||||
do {
|
||||
|
|
@ -8935,6 +8846,7 @@ static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx)
|
|||
finish_wait(&tctx->wait, &wait);
|
||||
} while (1);
|
||||
atomic_dec(&tctx->in_idle);
|
||||
io_sq_thread_unpark(sqd);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -9511,12 +9423,7 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p,
|
|||
ctx->compat = in_compat_syscall();
|
||||
ctx->limit_mem = !capable(CAP_IPC_LOCK);
|
||||
ctx->user = user;
|
||||
ctx->creds = get_current_cred();
|
||||
#ifdef CONFIG_AUDIT
|
||||
ctx->loginuid = current->loginuid;
|
||||
ctx->sessionid = current->sessionid;
|
||||
#endif
|
||||
ctx->sqo_task = get_task_struct(current);
|
||||
ctx->sqo_task = current;
|
||||
|
||||
/*
|
||||
* This is just grabbed for accounting purposes. When a process exits,
|
||||
|
|
@ -9527,24 +9434,6 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p,
|
|||
mmgrab(current->mm);
|
||||
ctx->mm_account = current->mm;
|
||||
|
||||
#ifdef CONFIG_BLK_CGROUP
|
||||
/*
|
||||
* The sq thread will belong to the original cgroup it was inited in.
|
||||
* If the cgroup goes offline (e.g. disabling the io controller), then
|
||||
* issued bios will be associated with the closest cgroup later in the
|
||||
* block layer.
|
||||
*/
|
||||
rcu_read_lock();
|
||||
ctx->sqo_blkcg_css = blkcg_css();
|
||||
ret = css_tryget_online(ctx->sqo_blkcg_css);
|
||||
rcu_read_unlock();
|
||||
if (!ret) {
|
||||
/* don't init against a dying cgroup, have the user try again */
|
||||
ctx->sqo_blkcg_css = NULL;
|
||||
ret = -ENODEV;
|
||||
goto err;
|
||||
}
|
||||
#endif
|
||||
ret = io_allocate_scq_urings(ctx, p);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
|
|
|||
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