mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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io_uring-5.7-2020-04-09
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl6Pxm0QHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpunoD/9Q5g5G/N14UWQpMMh5SxZ98dZL/ogT2RQt eCOROX1Iz3MbHAwQbLd8AaeWkzSG9UjRsF8ED7Td1LRkgaDxrBdnlyx19ys+eiPe ePhM9yoBTpjef3my46/Q7dKUoI1KxWW95QDY0QgRRhP7UQEKRJcppXdNOIs3Bsn4 RstRJi8XulUeS/FUGChydmbJCX4euy/uIB5C8FoWCN70SeF9LiXkhF+YeyUaGYJE VY9UOTFd1UDcoaZfwaQBxya1hj0mOthax9/1Sw9k21FXwdMDObfpgGtisODRTubQ z0NyVl17eoPae6oG6YaGht6YRo7t8D98PmjnEN4D38XMl1dzSBFRN0e9e39PvYS+ NN3ICADAJO6xLkSt97GqpE7KPlfYBzap/dQ3Zlcz1LM3nPYEYtCgPp+90D3Ah8+4 rW+/wMb+SOOithY89aE14e50PABDDnTpL1sftbpfxiqculUQrD2HqmwT5Q2V91DQ 61xspJ8H/TYbJ01v1ChYoCaYYNdbJmsJpGcourVErIoRq5rvEH1nCKFS+8UbBboR CP2K26BxFnQ2ryxdqae99c+E38DJzlZk/51KAeZO3TfIEVKFozaQr/J93FENyKGl ZUXim5pU7dzGC8v8GECjYzGtY5FA4YjwlsjPRqYzj+hHhuuE/qn3wovH/d7vGvSt xFZojkj7aA== =2R2G -----END PGP SIGNATURE----- Merge tag 'io_uring-5.7-2020-04-09' of git://git.kernel.dk/linux-block Pull io_uring fixes from Jens Axboe: "Here's a set of fixes that either weren't quite ready for the first, or came about from some intensive testing on memcached with 350K+ sockets. Summary: - Fixes for races or deadlocks around poll handling - Don't double account fixed files against RLIMIT_NOFILE - IORING_OP_OPENAT LFS fix - Poll retry handling (Bijan) - Missing finish_wait() for SQPOLL (Hillf) - Cleanup/split of io_kiocb alloc vs ctx references (Pavel) - Fixed file unregistration and init fixes (Xiaoguang) - Various little fixes (Xiaoguang, Pavel, Colin)" * tag 'io_uring-5.7-2020-04-09' of git://git.kernel.dk/linux-block: io_uring: punt final io_ring_ctx wait-and-free to workqueue io_uring: fix fs cleanup on cqe overflow io_uring: don't read user-shared sqe flags twice io_uring: remove req init from io_get_req() io_uring: alloc req only after getting sqe io_uring: simplify io_get_sqring io_uring: do not always copy iovec in io_req_map_rw() io_uring: ensure openat sets O_LARGEFILE if needed io_uring: initialize fixed_file_data lock io_uring: remove redundant variable pointer nxt and io_wq_assign_next call io_uring: fix ctx refcounting in io_submit_sqes() io_uring: process requests completed with -EAGAIN on poll list io_uring: remove bogus RLIMIT_NOFILE check in file registration io_uring: use io-wq manager as backup task if task is exiting io_uring: grab task reference for poll requests io_uring: retry poll if we got woken with non-matching mask io_uring: add missing finish_wait() in io_sq_thread() io_uring: refactor file register/unregister/update handling
This commit is contained in:
commit
172edde960
3 changed files with 270 additions and 174 deletions
12
fs/io-wq.c
12
fs/io-wq.c
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@ -17,6 +17,7 @@
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#include <linux/kthread.h>
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#include <linux/rculist_nulls.h>
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#include <linux/fs_struct.h>
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#include <linux/task_work.h>
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#include "io-wq.h"
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@ -716,6 +717,9 @@ static int io_wq_manager(void *data)
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complete(&wq->done);
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while (!kthread_should_stop()) {
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if (current->task_works)
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task_work_run();
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for_each_node(node) {
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struct io_wqe *wqe = wq->wqes[node];
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bool fork_worker[2] = { false, false };
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@ -738,6 +742,9 @@ static int io_wq_manager(void *data)
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schedule_timeout(HZ);
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}
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if (current->task_works)
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task_work_run();
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return 0;
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err:
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set_bit(IO_WQ_BIT_ERROR, &wq->state);
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@ -1124,3 +1131,8 @@ void io_wq_destroy(struct io_wq *wq)
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if (refcount_dec_and_test(&wq->use_refs))
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__io_wq_destroy(wq);
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}
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struct task_struct *io_wq_get_task(struct io_wq *wq)
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{
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return wq->manager;
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}
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@ -136,6 +136,8 @@ 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);
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struct task_struct *io_wq_get_task(struct io_wq *wq);
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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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430
fs/io_uring.c
430
fs/io_uring.c
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@ -186,14 +186,23 @@ struct fixed_file_table {
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struct file **files;
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};
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struct fixed_file_ref_node {
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struct percpu_ref refs;
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struct list_head node;
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struct list_head file_list;
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struct fixed_file_data *file_data;
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struct work_struct work;
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};
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struct fixed_file_data {
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struct fixed_file_table *table;
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struct io_ring_ctx *ctx;
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struct percpu_ref *cur_refs;
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struct percpu_ref refs;
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struct llist_head put_llist;
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struct work_struct ref_work;
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struct completion done;
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struct list_head ref_list;
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spinlock_t lock;
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};
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struct io_buffer {
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@ -317,6 +326,8 @@ struct io_ring_ctx {
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spinlock_t inflight_lock;
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struct list_head inflight_list;
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} ____cacheline_aligned_in_smp;
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struct work_struct exit_work;
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};
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/*
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@ -599,6 +610,7 @@ struct io_kiocb {
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};
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struct io_async_ctx *io;
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int cflags;
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bool needs_fixed_file;
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u8 opcode;
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@ -606,10 +618,8 @@ struct io_kiocb {
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struct list_head list;
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unsigned int flags;
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refcount_t refs;
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union {
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struct task_struct *task;
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unsigned long fsize;
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};
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struct task_struct *task;
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unsigned long fsize;
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u64 user_data;
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u32 result;
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u32 sequence;
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@ -618,6 +628,8 @@ struct io_kiocb {
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struct list_head inflight_entry;
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struct percpu_ref *fixed_file_refs;
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union {
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/*
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* Only commands that never go async can use the below fields,
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@ -629,7 +641,6 @@ struct io_kiocb {
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struct callback_head task_work;
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struct hlist_node hash_node;
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struct async_poll *apoll;
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int cflags;
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};
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struct io_wq_work work;
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};
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@ -848,7 +859,6 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
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struct io_uring_files_update *ip,
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unsigned nr_args);
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static int io_grab_files(struct io_kiocb *req);
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static void io_ring_file_ref_flush(struct fixed_file_data *data);
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static void io_cleanup_req(struct io_kiocb *req);
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static int io_file_get(struct io_submit_state *state, struct io_kiocb *req,
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int fd, struct file **out_file, bool fixed);
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@ -1285,8 +1295,8 @@ static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx)
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return NULL;
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}
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static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
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struct io_submit_state *state)
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static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx,
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struct io_submit_state *state)
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{
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gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
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struct io_kiocb *req;
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@ -1319,41 +1329,20 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
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req = state->reqs[state->free_reqs];
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}
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got_it:
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req->io = NULL;
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req->file = NULL;
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req->ctx = ctx;
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req->flags = 0;
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/* one is dropped after submission, the other at completion */
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refcount_set(&req->refs, 2);
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req->result = 0;
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INIT_IO_WORK(&req->work, io_wq_submit_work);
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return req;
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fallback:
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req = io_get_fallback_req(ctx);
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if (req)
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goto got_it;
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percpu_ref_put(&ctx->refs);
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return NULL;
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return io_get_fallback_req(ctx);
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}
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static inline void io_put_file(struct io_kiocb *req, struct file *file,
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bool fixed)
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{
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if (fixed)
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percpu_ref_put(&req->ctx->file_data->refs);
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percpu_ref_put(req->fixed_file_refs);
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else
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fput(file);
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}
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static void __io_req_do_free(struct io_kiocb *req)
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{
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if (likely(!io_is_fallback_req(req)))
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kmem_cache_free(req_cachep, req);
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else
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clear_bit_unlock(0, (unsigned long *) req->ctx->fallback_req);
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}
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static void __io_req_aux_free(struct io_kiocb *req)
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{
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if (req->flags & REQ_F_NEED_CLEANUP)
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@ -1362,6 +1351,8 @@ static void __io_req_aux_free(struct io_kiocb *req)
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kfree(req->io);
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if (req->file)
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io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
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if (req->task)
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put_task_struct(req->task);
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io_req_work_drop_env(req);
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}
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@ -1382,7 +1373,10 @@ static void __io_free_req(struct io_kiocb *req)
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}
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percpu_ref_put(&req->ctx->refs);
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__io_req_do_free(req);
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if (likely(!io_is_fallback_req(req)))
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kmem_cache_free(req_cachep, req);
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else
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clear_bit_unlock(0, (unsigned long *) req->ctx->fallback_req);
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}
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struct req_batch {
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@ -1393,21 +1387,18 @@ struct req_batch {
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static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb)
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{
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int fixed_refs = rb->to_free;
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if (!rb->to_free)
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return;
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if (rb->need_iter) {
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int i, inflight = 0;
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unsigned long flags;
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fixed_refs = 0;
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for (i = 0; i < rb->to_free; i++) {
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struct io_kiocb *req = rb->reqs[i];
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if (req->flags & REQ_F_FIXED_FILE) {
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req->file = NULL;
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fixed_refs++;
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percpu_ref_put(req->fixed_file_refs);
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}
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if (req->flags & REQ_F_INFLIGHT)
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inflight++;
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@ -1433,8 +1424,6 @@ static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb)
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}
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do_free:
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kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs);
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if (fixed_refs)
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percpu_ref_put_many(&ctx->file_data->refs, fixed_refs);
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percpu_ref_put_many(&ctx->refs, rb->to_free);
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rb->to_free = rb->need_iter = 0;
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}
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@ -1738,11 +1727,24 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
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io_free_req_many(ctx, &rb);
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}
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static void io_iopoll_queue(struct list_head *again)
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{
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struct io_kiocb *req;
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do {
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req = list_first_entry(again, struct io_kiocb, list);
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list_del(&req->list);
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refcount_inc(&req->refs);
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io_queue_async_work(req);
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} while (!list_empty(again));
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}
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static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
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long min)
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{
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struct io_kiocb *req, *tmp;
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LIST_HEAD(done);
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LIST_HEAD(again);
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bool spin;
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int ret;
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@ -1757,9 +1759,9 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
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struct kiocb *kiocb = &req->rw.kiocb;
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/*
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* Move completed entries to our local list. If we find a
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* request that requires polling, break out and complete
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* the done list first, if we have entries there.
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* Move completed and retryable entries to our local lists.
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* If we find a request that requires polling, break out
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* and complete those lists first, if we have entries there.
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*/
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if (req->flags & REQ_F_IOPOLL_COMPLETED) {
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list_move_tail(&req->list, &done);
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@ -1768,6 +1770,13 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
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if (!list_empty(&done))
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break;
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if (req->result == -EAGAIN) {
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list_move_tail(&req->list, &again);
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continue;
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}
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if (!list_empty(&again))
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break;
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ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin);
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if (ret < 0)
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break;
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|
@ -1780,6 +1789,9 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
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if (!list_empty(&done))
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io_iopoll_complete(ctx, nr_events, &done);
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if (!list_empty(&again))
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io_iopoll_queue(&again);
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return ret;
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}
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|
@ -2465,8 +2477,9 @@ static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size,
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req->io->rw.iov = iovec;
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if (!req->io->rw.iov) {
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req->io->rw.iov = req->io->rw.fast_iov;
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memcpy(req->io->rw.iov, fast_iov,
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sizeof(struct iovec) * iter->nr_segs);
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if (req->io->rw.iov != fast_iov)
|
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memcpy(req->io->rw.iov, fast_iov,
|
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sizeof(struct iovec) * iter->nr_segs);
|
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} else {
|
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req->flags |= REQ_F_NEED_CLEANUP;
|
||||
}
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|
@ -2920,7 +2933,7 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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|||
|
||||
if (sqe->ioprio || sqe->buf_index)
|
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return -EINVAL;
|
||||
if (sqe->flags & IOSQE_FIXED_FILE)
|
||||
if (req->flags & REQ_F_FIXED_FILE)
|
||||
return -EBADF;
|
||||
if (req->flags & REQ_F_NEED_CLEANUP)
|
||||
return 0;
|
||||
|
@ -2929,6 +2942,8 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|||
req->open.how.mode = READ_ONCE(sqe->len);
|
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fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
||||
req->open.how.flags = READ_ONCE(sqe->open_flags);
|
||||
if (force_o_largefile())
|
||||
req->open.how.flags |= O_LARGEFILE;
|
||||
|
||||
req->open.filename = getname(fname);
|
||||
if (IS_ERR(req->open.filename)) {
|
||||
|
@ -2951,7 +2966,7 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|||
|
||||
if (sqe->ioprio || sqe->buf_index)
|
||||
return -EINVAL;
|
||||
if (sqe->flags & IOSQE_FIXED_FILE)
|
||||
if (req->flags & REQ_F_FIXED_FILE)
|
||||
return -EBADF;
|
||||
if (req->flags & REQ_F_NEED_CLEANUP)
|
||||
return 0;
|
||||
|
@ -3305,7 +3320,7 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|||
|
||||
if (sqe->ioprio || sqe->buf_index)
|
||||
return -EINVAL;
|
||||
if (sqe->flags & IOSQE_FIXED_FILE)
|
||||
if (req->flags & REQ_F_FIXED_FILE)
|
||||
return -EBADF;
|
||||
if (req->flags & REQ_F_NEED_CLEANUP)
|
||||
return 0;
|
||||
|
@ -3382,7 +3397,7 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|||
if (sqe->ioprio || sqe->off || sqe->addr || sqe->len ||
|
||||
sqe->rw_flags || sqe->buf_index)
|
||||
return -EINVAL;
|
||||
if (sqe->flags & IOSQE_FIXED_FILE)
|
||||
if (req->flags & REQ_F_FIXED_FILE)
|
||||
return -EBADF;
|
||||
|
||||
req->close.fd = READ_ONCE(sqe->fd);
|
||||
|
@ -3481,14 +3496,11 @@ static void __io_sync_file_range(struct io_kiocb *req)
|
|||
static void io_sync_file_range_finish(struct io_wq_work **workptr)
|
||||
{
|
||||
struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
|
||||
struct io_kiocb *nxt = NULL;
|
||||
|
||||
if (io_req_cancelled(req))
|
||||
return;
|
||||
__io_sync_file_range(req);
|
||||
io_put_req(req); /* put submission ref */
|
||||
if (nxt)
|
||||
io_wq_assign_next(workptr, nxt);
|
||||
}
|
||||
|
||||
static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock)
|
||||
|
@ -4114,6 +4126,7 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
|
|||
__poll_t mask, task_work_func_t func)
|
||||
{
|
||||
struct task_struct *tsk;
|
||||
int ret;
|
||||
|
||||
/* for instances that support it check for an event match first: */
|
||||
if (mask && !(mask & poll->events))
|
||||
|
@ -4127,11 +4140,15 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
|
|||
req->result = mask;
|
||||
init_task_work(&req->task_work, func);
|
||||
/*
|
||||
* If this fails, then the task is exiting. If that is the case, then
|
||||
* the exit check will ultimately cancel these work items. Hence we
|
||||
* don't need to check here and handle it specifically.
|
||||
* If this fails, then the task is exiting. Punt to one of the io-wq
|
||||
* threads to ensure the work gets run, we can't always rely on exit
|
||||
* cancelation taking care of this.
|
||||
*/
|
||||
task_work_add(tsk, &req->task_work, true);
|
||||
ret = task_work_add(tsk, &req->task_work, true);
|
||||
if (unlikely(ret)) {
|
||||
tsk = io_wq_get_task(req->ctx->io_wq);
|
||||
task_work_add(tsk, &req->task_work, true);
|
||||
}
|
||||
wake_up_process(tsk);
|
||||
return 1;
|
||||
}
|
||||
|
@ -4251,10 +4268,7 @@ static bool io_arm_poll_handler(struct io_kiocb *req)
|
|||
req->flags |= REQ_F_POLLED;
|
||||
memcpy(&apoll->work, &req->work, sizeof(req->work));
|
||||
|
||||
/*
|
||||
* Don't need a reference here, as we're adding it to the task
|
||||
* task_works list. If the task exits, the list is pruned.
|
||||
*/
|
||||
get_task_struct(current);
|
||||
req->task = current;
|
||||
req->apoll = apoll;
|
||||
INIT_HLIST_NODE(&req->hash_node);
|
||||
|
@ -4407,8 +4421,20 @@ static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error)
|
|||
static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt)
|
||||
{
|
||||
struct io_ring_ctx *ctx = req->ctx;
|
||||
struct io_poll_iocb *poll = &req->poll;
|
||||
|
||||
if (!req->result && !READ_ONCE(poll->canceled)) {
|
||||
struct poll_table_struct pt = { ._key = poll->events };
|
||||
|
||||
req->result = vfs_poll(req->file, &pt) & poll->events;
|
||||
}
|
||||
|
||||
spin_lock_irq(&ctx->completion_lock);
|
||||
if (!req->result && !READ_ONCE(poll->canceled)) {
|
||||
add_wait_queue(poll->head, &poll->wait);
|
||||
spin_unlock_irq(&ctx->completion_lock);
|
||||
return;
|
||||
}
|
||||
hash_del(&req->hash_node);
|
||||
io_poll_complete(req, req->result, 0);
|
||||
req->flags |= REQ_F_COMP_LOCKED;
|
||||
|
@ -4465,10 +4491,7 @@ static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
|
|||
events = READ_ONCE(sqe->poll_events);
|
||||
poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP;
|
||||
|
||||
/*
|
||||
* Don't need a reference here, as we're adding it to the task
|
||||
* task_works list. If the task exits, the list is pruned.
|
||||
*/
|
||||
get_task_struct(current);
|
||||
req->task = current;
|
||||
return 0;
|
||||
}
|
||||
|
@ -5331,7 +5354,8 @@ static int io_file_get(struct io_submit_state *state, struct io_kiocb *req,
|
|||
file = io_file_from_index(ctx, fd);
|
||||
if (!file)
|
||||
return -EBADF;
|
||||
percpu_ref_get(&ctx->file_data->refs);
|
||||
req->fixed_file_refs = ctx->file_data->cur_refs;
|
||||
percpu_ref_get(req->fixed_file_refs);
|
||||
} else {
|
||||
trace_io_uring_file_get(ctx, fd);
|
||||
file = __io_file_get(state, fd);
|
||||
|
@ -5344,15 +5368,10 @@ static int io_file_get(struct io_submit_state *state, struct io_kiocb *req,
|
|||
}
|
||||
|
||||
static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
|
||||
const struct io_uring_sqe *sqe)
|
||||
int fd, unsigned int flags)
|
||||
{
|
||||
unsigned flags;
|
||||
int fd;
|
||||
bool fixed;
|
||||
|
||||
flags = READ_ONCE(sqe->flags);
|
||||
fd = READ_ONCE(sqe->fd);
|
||||
|
||||
if (!io_req_needs_file(req, fd))
|
||||
return 0;
|
||||
|
||||
|
@ -5594,7 +5613,7 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
|
|||
{
|
||||
struct io_ring_ctx *ctx = req->ctx;
|
||||
unsigned int sqe_flags;
|
||||
int ret, id;
|
||||
int ret, id, fd;
|
||||
|
||||
sqe_flags = READ_ONCE(sqe->flags);
|
||||
|
||||
|
@ -5625,7 +5644,8 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
|
|||
IOSQE_ASYNC | IOSQE_FIXED_FILE |
|
||||
IOSQE_BUFFER_SELECT);
|
||||
|
||||
ret = io_req_set_file(state, req, sqe);
|
||||
fd = READ_ONCE(sqe->fd);
|
||||
ret = io_req_set_file(state, req, fd, sqe_flags);
|
||||
if (unlikely(ret)) {
|
||||
err_req:
|
||||
io_cqring_add_event(req, ret);
|
||||
|
@ -5741,8 +5761,7 @@ static void io_commit_sqring(struct io_ring_ctx *ctx)
|
|||
* used, it's important that those reads are done through READ_ONCE() to
|
||||
* prevent a re-load down the line.
|
||||
*/
|
||||
static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req,
|
||||
const struct io_uring_sqe **sqe_ptr)
|
||||
static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
|
||||
{
|
||||
u32 *sq_array = ctx->sq_array;
|
||||
unsigned head;
|
||||
|
@ -5756,25 +5775,40 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req,
|
|||
* though the application is the one updating it.
|
||||
*/
|
||||
head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]);
|
||||
if (likely(head < ctx->sq_entries)) {
|
||||
/*
|
||||
* All io need record the previous position, if LINK vs DARIN,
|
||||
* it can be used to mark the position of the first IO in the
|
||||
* link list.
|
||||
*/
|
||||
req->sequence = ctx->cached_sq_head;
|
||||
*sqe_ptr = &ctx->sq_sqes[head];
|
||||
req->opcode = READ_ONCE((*sqe_ptr)->opcode);
|
||||
req->user_data = READ_ONCE((*sqe_ptr)->user_data);
|
||||
ctx->cached_sq_head++;
|
||||
return true;
|
||||
}
|
||||
if (likely(head < ctx->sq_entries))
|
||||
return &ctx->sq_sqes[head];
|
||||
|
||||
/* drop invalid entries */
|
||||
ctx->cached_sq_head++;
|
||||
ctx->cached_sq_dropped++;
|
||||
WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped);
|
||||
return false;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline void io_consume_sqe(struct io_ring_ctx *ctx)
|
||||
{
|
||||
ctx->cached_sq_head++;
|
||||
}
|
||||
|
||||
static void io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
|
||||
const struct io_uring_sqe *sqe)
|
||||
{
|
||||
/*
|
||||
* All io need record the previous position, if LINK vs DARIN,
|
||||
* it can be used to mark the position of the first IO in the
|
||||
* link list.
|
||||
*/
|
||||
req->sequence = ctx->cached_sq_head;
|
||||
req->opcode = READ_ONCE(sqe->opcode);
|
||||
req->user_data = READ_ONCE(sqe->user_data);
|
||||
req->io = NULL;
|
||||
req->file = NULL;
|
||||
req->ctx = ctx;
|
||||
req->flags = 0;
|
||||
/* one is dropped after submission, the other at completion */
|
||||
refcount_set(&req->refs, 2);
|
||||
req->task = NULL;
|
||||
req->result = 0;
|
||||
INIT_IO_WORK(&req->work, io_wq_submit_work);
|
||||
}
|
||||
|
||||
static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
|
||||
|
@ -5812,17 +5846,20 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
|
|||
struct io_kiocb *req;
|
||||
int err;
|
||||
|
||||
req = io_get_req(ctx, statep);
|
||||
sqe = io_get_sqe(ctx);
|
||||
if (unlikely(!sqe)) {
|
||||
io_consume_sqe(ctx);
|
||||
break;
|
||||
}
|
||||
req = io_alloc_req(ctx, statep);
|
||||
if (unlikely(!req)) {
|
||||
if (!submitted)
|
||||
submitted = -EAGAIN;
|
||||
break;
|
||||
}
|
||||
if (!io_get_sqring(ctx, req, &sqe)) {
|
||||
__io_req_do_free(req);
|
||||
break;
|
||||
}
|
||||
|
||||
io_init_req(ctx, req, sqe);
|
||||
io_consume_sqe(ctx);
|
||||
/* will complete beyond this point, count as submitted */
|
||||
submitted++;
|
||||
|
||||
|
@ -5962,6 +5999,7 @@ static int io_sq_thread(void *data)
|
|||
}
|
||||
if (current->task_works) {
|
||||
task_work_run();
|
||||
finish_wait(&ctx->sqo_wait, &wait);
|
||||
continue;
|
||||
}
|
||||
if (signal_pending(current))
|
||||
|
@ -6124,43 +6162,36 @@ static void io_file_ref_kill(struct percpu_ref *ref)
|
|||
complete(&data->done);
|
||||
}
|
||||
|
||||
static void io_file_ref_exit_and_free(struct work_struct *work)
|
||||
{
|
||||
struct fixed_file_data *data;
|
||||
|
||||
data = container_of(work, struct fixed_file_data, ref_work);
|
||||
|
||||
/*
|
||||
* Ensure any percpu-ref atomic switch callback has run, it could have
|
||||
* been in progress when the files were being unregistered. Once
|
||||
* that's done, we can safely exit and free the ref and containing
|
||||
* data structure.
|
||||
*/
|
||||
rcu_barrier();
|
||||
percpu_ref_exit(&data->refs);
|
||||
kfree(data);
|
||||
}
|
||||
|
||||
static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
|
||||
{
|
||||
struct fixed_file_data *data = ctx->file_data;
|
||||
struct fixed_file_ref_node *ref_node = NULL;
|
||||
unsigned nr_tables, i;
|
||||
unsigned long flags;
|
||||
|
||||
if (!data)
|
||||
return -ENXIO;
|
||||
|
||||
percpu_ref_kill_and_confirm(&data->refs, io_file_ref_kill);
|
||||
flush_work(&data->ref_work);
|
||||
spin_lock_irqsave(&data->lock, flags);
|
||||
if (!list_empty(&data->ref_list))
|
||||
ref_node = list_first_entry(&data->ref_list,
|
||||
struct fixed_file_ref_node, node);
|
||||
spin_unlock_irqrestore(&data->lock, flags);
|
||||
if (ref_node)
|
||||
percpu_ref_kill(&ref_node->refs);
|
||||
|
||||
percpu_ref_kill(&data->refs);
|
||||
|
||||
/* wait for all refs nodes to complete */
|
||||
wait_for_completion(&data->done);
|
||||
io_ring_file_ref_flush(data);
|
||||
|
||||
__io_sqe_files_unregister(ctx);
|
||||
nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE);
|
||||
for (i = 0; i < nr_tables; i++)
|
||||
kfree(data->table[i].files);
|
||||
kfree(data->table);
|
||||
INIT_WORK(&data->ref_work, io_file_ref_exit_and_free);
|
||||
queue_work(system_wq, &data->ref_work);
|
||||
percpu_ref_exit(&data->refs);
|
||||
kfree(data);
|
||||
ctx->file_data = NULL;
|
||||
ctx->nr_user_files = 0;
|
||||
return 0;
|
||||
|
@ -6204,13 +6235,6 @@ static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
|
|||
struct sk_buff *skb;
|
||||
int i, nr_files;
|
||||
|
||||
if (!capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) {
|
||||
unsigned long inflight = ctx->user->unix_inflight + nr;
|
||||
|
||||
if (inflight > task_rlimit(current, RLIMIT_NOFILE))
|
||||
return -EMFILE;
|
||||
}
|
||||
|
||||
fpl = kzalloc(sizeof(*fpl), GFP_KERNEL);
|
||||
if (!fpl)
|
||||
return -ENOMEM;
|
||||
|
@ -6385,46 +6409,72 @@ static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file)
|
|||
}
|
||||
|
||||
struct io_file_put {
|
||||
struct llist_node llist;
|
||||
struct list_head list;
|
||||
struct file *file;
|
||||
};
|
||||
|
||||
static void io_ring_file_ref_flush(struct fixed_file_data *data)
|
||||
static void io_file_put_work(struct work_struct *work)
|
||||
{
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
struct fixed_file_data *file_data;
|
||||
struct io_ring_ctx *ctx;
|
||||
struct io_file_put *pfile, *tmp;
|
||||
struct llist_node *node;
|
||||
unsigned long flags;
|
||||
|
||||
while ((node = llist_del_all(&data->put_llist)) != NULL) {
|
||||
llist_for_each_entry_safe(pfile, tmp, node, llist) {
|
||||
io_ring_file_put(data->ctx, pfile->file);
|
||||
kfree(pfile);
|
||||
}
|
||||
ref_node = container_of(work, struct fixed_file_ref_node, work);
|
||||
file_data = ref_node->file_data;
|
||||
ctx = file_data->ctx;
|
||||
|
||||
list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) {
|
||||
list_del_init(&pfile->list);
|
||||
io_ring_file_put(ctx, pfile->file);
|
||||
kfree(pfile);
|
||||
}
|
||||
}
|
||||
|
||||
static void io_ring_file_ref_switch(struct work_struct *work)
|
||||
{
|
||||
struct fixed_file_data *data;
|
||||
spin_lock_irqsave(&file_data->lock, flags);
|
||||
list_del_init(&ref_node->node);
|
||||
spin_unlock_irqrestore(&file_data->lock, flags);
|
||||
|
||||
data = container_of(work, struct fixed_file_data, ref_work);
|
||||
io_ring_file_ref_flush(data);
|
||||
percpu_ref_switch_to_percpu(&data->refs);
|
||||
percpu_ref_exit(&ref_node->refs);
|
||||
kfree(ref_node);
|
||||
percpu_ref_put(&file_data->refs);
|
||||
}
|
||||
|
||||
static void io_file_data_ref_zero(struct percpu_ref *ref)
|
||||
{
|
||||
struct fixed_file_data *data;
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
|
||||
data = container_of(ref, struct fixed_file_data, refs);
|
||||
ref_node = container_of(ref, struct fixed_file_ref_node, refs);
|
||||
|
||||
/*
|
||||
* We can't safely switch from inside this context, punt to wq. If
|
||||
* the table ref is going away, the table is being unregistered.
|
||||
* Don't queue up the async work for that case, the caller will
|
||||
* handle it.
|
||||
*/
|
||||
if (!percpu_ref_is_dying(&data->refs))
|
||||
queue_work(system_wq, &data->ref_work);
|
||||
queue_work(system_wq, &ref_node->work);
|
||||
}
|
||||
|
||||
static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
|
||||
struct io_ring_ctx *ctx)
|
||||
{
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
|
||||
ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
|
||||
if (!ref_node)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero,
|
||||
0, GFP_KERNEL)) {
|
||||
kfree(ref_node);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
INIT_LIST_HEAD(&ref_node->node);
|
||||
INIT_LIST_HEAD(&ref_node->file_list);
|
||||
INIT_WORK(&ref_node->work, io_file_put_work);
|
||||
ref_node->file_data = ctx->file_data;
|
||||
return ref_node;
|
||||
|
||||
}
|
||||
|
||||
static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node)
|
||||
{
|
||||
percpu_ref_exit(&ref_node->refs);
|
||||
kfree(ref_node);
|
||||
}
|
||||
|
||||
static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
||||
|
@ -6435,6 +6485,8 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
|||
struct file *file;
|
||||
int fd, ret = 0;
|
||||
unsigned i;
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
unsigned long flags;
|
||||
|
||||
if (ctx->file_data)
|
||||
return -EBUSY;
|
||||
|
@ -6448,6 +6500,8 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
|||
return -ENOMEM;
|
||||
ctx->file_data->ctx = ctx;
|
||||
init_completion(&ctx->file_data->done);
|
||||
INIT_LIST_HEAD(&ctx->file_data->ref_list);
|
||||
spin_lock_init(&ctx->file_data->lock);
|
||||
|
||||
nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
|
||||
ctx->file_data->table = kcalloc(nr_tables,
|
||||
|
@ -6459,15 +6513,13 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
|||
return -ENOMEM;
|
||||
}
|
||||
|
||||
if (percpu_ref_init(&ctx->file_data->refs, io_file_data_ref_zero,
|
||||
if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill,
|
||||
PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
|
||||
kfree(ctx->file_data->table);
|
||||
kfree(ctx->file_data);
|
||||
ctx->file_data = NULL;
|
||||
return -ENOMEM;
|
||||
}
|
||||
ctx->file_data->put_llist.first = NULL;
|
||||
INIT_WORK(&ctx->file_data->ref_work, io_ring_file_ref_switch);
|
||||
|
||||
if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) {
|
||||
percpu_ref_exit(&ctx->file_data->refs);
|
||||
|
@ -6530,9 +6582,22 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
|||
}
|
||||
|
||||
ret = io_sqe_files_scm(ctx);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
io_sqe_files_unregister(ctx);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ref_node = alloc_fixed_file_ref_node(ctx);
|
||||
if (IS_ERR(ref_node)) {
|
||||
io_sqe_files_unregister(ctx);
|
||||
return PTR_ERR(ref_node);
|
||||
}
|
||||
|
||||
ctx->file_data->cur_refs = &ref_node->refs;
|
||||
spin_lock_irqsave(&ctx->file_data->lock, flags);
|
||||
list_add(&ref_node->node, &ctx->file_data->ref_list);
|
||||
spin_unlock_irqrestore(&ctx->file_data->lock, flags);
|
||||
percpu_ref_get(&ctx->file_data->refs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
@ -6579,30 +6644,21 @@ static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
|
|||
#endif
|
||||
}
|
||||
|
||||
static void io_atomic_switch(struct percpu_ref *ref)
|
||||
{
|
||||
struct fixed_file_data *data;
|
||||
|
||||
/*
|
||||
* Juggle reference to ensure we hit zero, if needed, so we can
|
||||
* switch back to percpu mode
|
||||
*/
|
||||
data = container_of(ref, struct fixed_file_data, refs);
|
||||
percpu_ref_put(&data->refs);
|
||||
percpu_ref_get(&data->refs);
|
||||
}
|
||||
|
||||
static int io_queue_file_removal(struct fixed_file_data *data,
|
||||
struct file *file)
|
||||
struct file *file)
|
||||
{
|
||||
struct io_file_put *pfile;
|
||||
struct percpu_ref *refs = data->cur_refs;
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
|
||||
pfile = kzalloc(sizeof(*pfile), GFP_KERNEL);
|
||||
if (!pfile)
|
||||
return -ENOMEM;
|
||||
|
||||
ref_node = container_of(refs, struct fixed_file_ref_node, refs);
|
||||
pfile->file = file;
|
||||
llist_add(&pfile->llist, &data->put_llist);
|
||||
list_add(&pfile->list, &ref_node->file_list);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -6611,17 +6667,23 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
|
|||
unsigned nr_args)
|
||||
{
|
||||
struct fixed_file_data *data = ctx->file_data;
|
||||
bool ref_switch = false;
|
||||
struct fixed_file_ref_node *ref_node;
|
||||
struct file *file;
|
||||
__s32 __user *fds;
|
||||
int fd, i, err;
|
||||
__u32 done;
|
||||
unsigned long flags;
|
||||
bool needs_switch = false;
|
||||
|
||||
if (check_add_overflow(up->offset, nr_args, &done))
|
||||
return -EOVERFLOW;
|
||||
if (done > ctx->nr_user_files)
|
||||
return -EINVAL;
|
||||
|
||||
ref_node = alloc_fixed_file_ref_node(ctx);
|
||||
if (IS_ERR(ref_node))
|
||||
return PTR_ERR(ref_node);
|
||||
|
||||
done = 0;
|
||||
fds = u64_to_user_ptr(up->fds);
|
||||
while (nr_args) {
|
||||
|
@ -6642,7 +6704,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
|
|||
if (err)
|
||||
break;
|
||||
table->files[index] = NULL;
|
||||
ref_switch = true;
|
||||
needs_switch = true;
|
||||
}
|
||||
if (fd != -1) {
|
||||
file = fget(fd);
|
||||
|
@ -6673,11 +6735,19 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
|
|||
up->offset++;
|
||||
}
|
||||
|
||||
if (ref_switch)
|
||||
percpu_ref_switch_to_atomic(&data->refs, io_atomic_switch);
|
||||
if (needs_switch) {
|
||||
percpu_ref_kill(data->cur_refs);
|
||||
spin_lock_irqsave(&data->lock, flags);
|
||||
list_add(&ref_node->node, &data->ref_list);
|
||||
data->cur_refs = &ref_node->refs;
|
||||
spin_unlock_irqrestore(&data->lock, flags);
|
||||
percpu_ref_get(&ctx->file_data->refs);
|
||||
} else
|
||||
destroy_fixed_file_ref_node(ref_node);
|
||||
|
||||
return done ? done : err;
|
||||
}
|
||||
|
||||
static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg,
|
||||
unsigned nr_args)
|
||||
{
|
||||
|
@ -7203,6 +7273,18 @@ static int io_remove_personalities(int id, void *p, void *data)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void io_ring_exit_work(struct work_struct *work)
|
||||
{
|
||||
struct io_ring_ctx *ctx;
|
||||
|
||||
ctx = container_of(work, struct io_ring_ctx, exit_work);
|
||||
if (ctx->rings)
|
||||
io_cqring_overflow_flush(ctx, true);
|
||||
|
||||
wait_for_completion(&ctx->completions[0]);
|
||||
io_ring_ctx_free(ctx);
|
||||
}
|
||||
|
||||
static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
|
||||
{
|
||||
mutex_lock(&ctx->uring_lock);
|
||||
|
@ -7230,8 +7312,8 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
|
|||
if (ctx->rings)
|
||||
io_cqring_overflow_flush(ctx, true);
|
||||
idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx);
|
||||
wait_for_completion(&ctx->completions[0]);
|
||||
io_ring_ctx_free(ctx);
|
||||
INIT_WORK(&ctx->exit_work, io_ring_exit_work);
|
||||
queue_work(system_wq, &ctx->exit_work);
|
||||
}
|
||||
|
||||
static int io_uring_release(struct inode *inode, struct file *file)
|
||||
|
|
Loading…
Reference in a new issue