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f16c01edeb
commit45500dc4e0upstream. io-wq will retry iopoll even when it failed with -EAGAIN. If that races with task exit, which sets TIF_NOTIFY_SIGNAL for all its workers, such workers might potentially infinitely spin retrying iopoll again and again and each time failing on some allocation / waiting / etc. Don't keep spinning if io-wq is dying. Fixes:561fb04a6a("io_uring: replace workqueue usage with io-wq") Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
#ifndef INTERNAL_IO_WQ_H
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#define INTERNAL_IO_WQ_H
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#include <linux/refcount.h>
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#include <linux/io_uring_types.h>
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struct io_wq;
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enum {
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IO_WQ_WORK_CANCEL = 1,
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IO_WQ_WORK_HASHED = 2,
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IO_WQ_WORK_UNBOUND = 4,
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IO_WQ_WORK_CONCURRENT = 16,
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IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
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};
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enum io_wq_cancel {
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IO_WQ_CANCEL_OK, /* cancelled before started */
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IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
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IO_WQ_CANCEL_NOTFOUND, /* work not found */
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};
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typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *);
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typedef void (io_wq_work_fn)(struct io_wq_work *);
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struct io_wq_hash {
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refcount_t refs;
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unsigned long map;
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struct wait_queue_head wait;
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};
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static inline void io_wq_put_hash(struct io_wq_hash *hash)
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{
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if (refcount_dec_and_test(&hash->refs))
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kfree(hash);
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}
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struct io_wq_data {
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struct io_wq_hash *hash;
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struct task_struct *task;
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io_wq_work_fn *do_work;
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free_work_fn *free_work;
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};
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struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
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void io_wq_exit_start(struct io_wq *wq);
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void io_wq_put_and_exit(struct io_wq *wq);
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void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
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void io_wq_hash_work(struct io_wq_work *work, void *val);
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int io_wq_cpu_affinity(struct io_uring_task *tctx, cpumask_var_t mask);
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int io_wq_max_workers(struct io_wq *wq, int *new_count);
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bool io_wq_worker_stopped(void);
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static inline bool io_wq_is_hashed(struct io_wq_work *work)
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{
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return work->flags & IO_WQ_WORK_HASHED;
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}
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typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
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enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
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void *data, bool cancel_all);
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#if defined(CONFIG_IO_WQ)
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extern void io_wq_worker_sleeping(struct task_struct *);
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extern void io_wq_worker_running(struct task_struct *);
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#else
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static inline void io_wq_worker_sleeping(struct task_struct *tsk)
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{
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}
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static inline void io_wq_worker_running(struct task_struct *tsk)
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{
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}
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#endif
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static inline bool io_wq_current_is_worker(void)
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{
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return in_task() && (current->flags & PF_IO_WORKER) &&
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current->worker_private;
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}
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#endif
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