Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 22:21:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

for-6.3/io_uring-2023-02-16

Browse Source 
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmPueWMQHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgprngEADFtiQ+B3+PQxo6Y32H7JJloqG7e6HtyysO
 i7mZm3kbnpklFqqjqgswlTeBxwmQnJxfTaY9pl89AGMps2VmW50GpwnDR7VJb4nF
 VdWHgQ9n3+P/C+p1zcH0T+8ftP5GnmgckEWKisxIxaNNCGuenGhYmFo2qC7CyCl9
 pzcukYrbjauytR59aCtV+bVZ/9tjpQw7QylUJ0oEk+BZ8md5O+DBUfkZbA65qj1X
 G9Jyb5fybLkyiWU2oXJ7XjSqEYND7I5io0yg9CtGsYzHCgrZcteX0L2Jux5CYvLd
 6QIEgPWF1235Z9L0Zy7RcT6rvuCTVTdGVTjAFgT67WpeTaLNLn4ZC4Pm0MGGsx1i
 QhLsMxJhyFCcsMrii1FtIKPrxvS9hI/5HYymhUqU4wksno4Fpfg3nW2/HUGuNJBa
 35AUwX4OhGvSfXPDJDuRjjNlzCFu5dWJoWwi0CRv6zrPcrqPQ5WZHGqURjzJYNaJ
 zz32PbQVObrs3nxj7UTa9g5eInqtXGnrd//f9BcMgnykgvXpBrtFq/l1oB0oDR/r
 m1HKiZBlcUqHZ+DqgbhXmRJCtbwuxt25WPMPxSqSzizZVuaKszyYreOOMfhxJFNd
 SH8kzJ83O4mBeCKozt6WwroHDFq5QRn9ILa/m40CUzci731Wdh3RBt7JXN+Yuc3S
 i/1kegdeNA==
 =dX7U
 -----END PGP SIGNATURE-----

Merge tag 'for-6.3/io_uring-2023-02-16' of git://git.kernel.dk/linux

Pull io_uring updates from Jens Axboe:

 - Cleanup series making the async prep and handling of
   REQ_F_FORCE_ASYNC easier to follow and verify (Dylan)

 - Enable specifying specific flags for OP_MSG_RING (Breno)

 - Enable use of KASAN with the internal request cache (Breno)

 - Split the opcode definition structs into a hot and cold part (Breno)

 - OP_MSG_RING fixes (Pavel, me)

 - Fix an issue with IOPOLL cancelation and PREEMPT_NONE (me)

 - Handle TIF_NOTIFY_RESUME for the io-wq threads that never return to
   userspace (me)

 - Add support for using io_uring_register() with a registered ring fd
   (Josh)

 - Improve handling of poll on the ring fd (Pavel)

 - Series improving the task_work handling (Pavel)

 - Misc cleanups, fixes, improvements (Dmitrii, Quanfa, Richard, Pavel,
   me)

* tag 'for-6.3/io_uring-2023-02-16' of git://git.kernel.dk/linux: (51 commits)
  io_uring: Support calling io_uring_register with a registered ring fd
  io_uring,audit: don't log IORING_OP_MADVISE
  io_uring: mark task TASK_RUNNING before handling resume/task work
  io_uring: always go async for unsupported open flags
  io_uring: always go async for unsupported fadvise flags
  io_uring: for requests that require async, force it
  io_uring: if a linked request has REQ_F_FORCE_ASYNC then run it async
  io_uring: add reschedule point to handle_tw_list()
  io_uring: add a conditional reschedule to the IOPOLL cancelation loop
  io_uring: return normal tw run linking optimisation
  io_uring: refactor tctx_task_work
  io_uring: refactor io_put_task helpers
  io_uring: refactor req allocation
  io_uring: improve io_get_sqe
  io_uring: kill outdated comment about overflow flush
  io_uring: use user visible tail in io_uring_poll()
  io_uring: pass in io_issue_def to io_assign_file()
  io_uring: Enable KASAN for request cache
  io_uring: handle TIF_NOTIFY_RESUME when checking for task_work
  io_uring/msg-ring: ensure flags passing works for task_work completions
  ...
This commit is contained in:
Linus Torvalds 2023-02-20 13:53:39 -08:00
commit cce5fe5eda
20 changed files with 702 additions and 412 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
include/linux/io_uring_types.h
View File

@ -195,21 +195,23 @@ struct io_alloc_cache {
struct io_ring_ctx {
/* const or read-mostly hot data */
struct {
struct percpu_ref refs;
struct io_rings *rings;
unsigned int flags;
enum task_work_notify_mode notify_method;
unsigned int compat: 1;
unsigned int drain_next: 1;
unsigned int restricted: 1;
unsigned int off_timeout_used: 1;
unsigned int drain_active: 1;
unsigned int drain_disabled: 1;
unsigned int has_evfd: 1;
unsigned int syscall_iopoll: 1;
/* all CQEs should be posted only by the submitter task */
unsigned int task_complete: 1;
unsigned int syscall_iopoll: 1;
unsigned int poll_activated: 1;
unsigned int drain_disabled: 1;
unsigned int compat: 1;
enum task_work_notify_mode notify_method;
struct io_rings *rings;
struct task_struct *submitter_task;
struct percpu_ref refs;
} ____cacheline_aligned_in_smp;
/* submission data */
@ -293,6 +295,7 @@ struct io_ring_ctx {
spinlock_t completion_lock;
bool poll_multi_queue;
bool cq_waiting;
/*
* ->iopoll_list is protected by the ctx->uring_lock for
@ -318,9 +321,8 @@ struct io_ring_ctx {
} ____cacheline_aligned_in_smp;
/* Keep this last, we don't need it for the fast path */
struct wait_queue_head poll_wq;
struct io_restriction restrictions;
struct task_struct *submitter_task;
/* slow path rsrc auxilary data, used by update/register */
struct io_rsrc_node *rsrc_backup_node;
@ -357,6 +359,7 @@ struct io_ring_ctx {
u32 iowq_limits[2];
bool iowq_limits_set;
struct callback_head poll_wq_task_work;
struct list_head defer_list;
unsigned sq_thread_idle;
/* protected by ->completion_lock */

8
include/uapi/linux/io_uring.h
View File

@ -347,6 +347,8 @@ enum {
* applicable for IORING_MSG_DATA, obviously.
*/
#define IORING_MSG_RING_CQE_SKIP (1U << 0)
/* Pass through the flags from sqe->file_index to cqe->flags */
#define IORING_MSG_RING_FLAGS_PASS (1U << 1)
/*
* IO completion data structure (Completion Queue Entry)
@ -470,6 +472,7 @@ struct io_uring_params {
#define IORING_FEAT_RSRC_TAGS (1U << 10)
#define IORING_FEAT_CQE_SKIP (1U << 11)
#define IORING_FEAT_LINKED_FILE (1U << 12)
#define IORING_FEAT_REG_REG_RING (1U << 13)
/*
* io_uring_register(2) opcodes and arguments
@ -517,7 +520,10 @@ enum {
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
/* this goes last */
IORING_REGISTER_LAST
IORING_REGISTER_LAST,
/* flag added to the opcode to use a registered ring fd */
IORING_REGISTER_USE_REGISTERED_RING = 1U << 31
};
/* io-wq worker categories */

29
io_uring/advise.c
View File

@ -39,6 +39,7 @@ int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
ma->addr = READ_ONCE(sqe->addr);
ma->len = READ_ONCE(sqe->len);
ma->advice = READ_ONCE(sqe->fadvise_advice);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
#else
return -EOPNOTSUPP;
@ -51,8 +52,7 @@ int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
io_req_set_res(req, ret, 0);
@ -62,6 +62,18 @@ int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
#endif
}
static bool io_fadvise_force_async(struct io_fadvise *fa)
{
switch (fa->advice) {
case POSIX_FADV_NORMAL:
case POSIX_FADV_RANDOM:
case POSIX_FADV_SEQUENTIAL:
return false;
default:
return true;
}
}
int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
@ -72,6 +84,8 @@ int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
fa->offset = READ_ONCE(sqe->off);
fa->len = READ_ONCE(sqe->len);
fa->advice = READ_ONCE(sqe->fadvise_advice);
if (io_fadvise_force_async(fa))
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -80,16 +94,7 @@ int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK) {
switch (fa->advice) {
case POSIX_FADV_NORMAL:
case POSIX_FADV_RANDOM:
case POSIX_FADV_SEQUENTIAL:
break;
default:
return -EAGAIN;
}
}
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
if (ret < 0)

20
io_uring/fs.c
View File

@ -74,6 +74,7 @@ int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -82,8 +83,7 @@ int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
ren->newpath, ren->flags);
@ -123,6 +123,7 @@ int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return PTR_ERR(un->filename);
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -131,8 +132,7 @@ int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
if (un->flags & AT_REMOVEDIR)
ret = do_rmdir(un->dfd, un->filename);
@ -170,6 +170,7 @@ int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return PTR_ERR(mkd->filename);
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -178,8 +179,7 @@ int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
@ -220,6 +220,7 @@ int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -228,8 +229,7 @@ int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
@ -265,6 +265,7 @@ int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -273,8 +274,7 @@ int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
lnk->newpath, lnk->flags);

480
io_uring/io_uring.c
View File

@ -151,7 +151,7 @@ static void io_move_task_work_from_local(struct io_ring_ctx *ctx);
static void __io_submit_flush_completions(struct io_ring_ctx *ctx);
static __cold void io_fallback_tw(struct io_uring_task *tctx);
static struct kmem_cache *req_cachep;
struct kmem_cache *req_cachep;
struct sock *io_uring_get_socket(struct file *file)
{
@ -230,6 +230,7 @@ static inline void req_fail_link_node(struct io_kiocb *req, int res)
static inline void io_req_add_to_cache(struct io_kiocb *req, struct io_ring_ctx *ctx)
{
wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list);
kasan_poison_object_data(req_cachep, req);
}
static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref)
@ -245,17 +246,15 @@ static __cold void io_fallback_req_func(struct work_struct *work)
fallback_work.work);
struct llist_node *node = llist_del_all(&ctx->fallback_llist);
struct io_kiocb *req, *tmp;
bool locked = false;
bool locked = true;
percpu_ref_get(&ctx->refs);
mutex_lock(&ctx->uring_lock);
llist_for_each_entry_safe(req, tmp, node, io_task_work.node)
req->io_task_work.func(req, &locked);
if (locked) {
io_submit_flush_completions(ctx);
mutex_unlock(&ctx->uring_lock);
}
percpu_ref_put(&ctx->refs);
if (WARN_ON_ONCE(!locked))
return;
io_submit_flush_completions(ctx);
mutex_unlock(&ctx->uring_lock);
}
static int io_alloc_hash_table(struct io_hash_table *table, unsigned bits)
@ -316,6 +315,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1);
mutex_init(&ctx->uring_lock);
init_waitqueue_head(&ctx->cq_wait);
init_waitqueue_head(&ctx->poll_wq);
spin_lock_init(&ctx->completion_lock);
spin_lock_init(&ctx->timeout_lock);
INIT_WQ_LIST(&ctx->iopoll_list);
@ -407,7 +407,7 @@ static inline void io_arm_ltimeout(struct io_kiocb *req)
static void io_prep_async_work(struct io_kiocb *req)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
struct io_ring_ctx *ctx = req->ctx;
if (!(req->flags & REQ_F_CREDS)) {
@ -572,6 +572,8 @@ static void io_eventfd_flush_signal(struct io_ring_ctx *ctx)
void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
{
if (ctx->poll_activated)
io_poll_wq_wake(ctx);
if (ctx->off_timeout_used)
io_flush_timeouts(ctx);
if (ctx->drain_active) {
@ -618,6 +620,25 @@ static inline void __io_cq_unlock_post(struct io_ring_ctx *ctx)
io_cqring_wake(ctx);
}
static inline void __io_cq_unlock_post_flush(struct io_ring_ctx *ctx)
__releases(ctx->completion_lock)
{
io_commit_cqring(ctx);
__io_cq_unlock(ctx);
io_commit_cqring_flush(ctx);
/*
* As ->task_complete implies that the ring is single tasked, cq_wait
* may only be waited on by the current in io_cqring_wait(), but since
* it will re-check the wakeup conditions once we return we can safely
* skip waking it up.
*/
if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN)) {
smp_mb();
__io_cqring_wake(ctx);
}
}
void io_cq_unlock_post(struct io_ring_ctx *ctx)
__releases(ctx->completion_lock)
{
@ -645,7 +666,6 @@ static void io_cqring_overflow_kill(struct io_ring_ctx *ctx)
}
}
/* Returns true if there are no backlogged entries after the flush */
static void __io_cqring_overflow_flush(struct io_ring_ctx *ctx)
{
size_t cqe_size = sizeof(struct io_uring_cqe);
@ -693,7 +713,8 @@ static void io_cqring_overflow_flush(struct io_ring_ctx *ctx)
io_cqring_do_overflow_flush(ctx);
}
void __io_put_task(struct task_struct *task, int nr)
/* can be called by any task */
static void io_put_task_remote(struct task_struct *task, int nr)
{
struct io_uring_task *tctx = task->io_uring;
@ -703,6 +724,21 @@ void __io_put_task(struct task_struct *task, int nr)
put_task_struct_many(task, nr);
}
/* used by a task to put its own references */
static void io_put_task_local(struct task_struct *task, int nr)
{
task->io_uring->cached_refs += nr;
}
/* must to be called somewhat shortly after putting a request */
static inline void io_put_task(struct task_struct *task, int nr)
{
if (likely(task == current))
io_put_task_local(task, nr);
else
io_put_task_remote(task, nr);
}
void io_task_refs_refill(struct io_uring_task *tctx)
{
unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR;
@ -945,15 +981,15 @@ static void __io_req_complete_post(struct io_kiocb *req)
req->link = NULL;
}
}
io_put_kbuf_comp(req);
io_dismantle_req(req);
io_req_put_rsrc(req);
/*
* Selected buffer deallocation in io_clean_op() assumes that
* we don't hold ->completion_lock. Clean them here to avoid
* deadlocks.
*/
io_put_kbuf_comp(req);
io_dismantle_req(req);
io_put_task(req->task, 1);
io_put_task_remote(req->task, 1);
wq_list_add_head(&req->comp_list, &ctx->locked_free_list);
ctx->locked_free_nr++;
}
@ -980,7 +1016,7 @@ void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
void io_req_defer_failed(struct io_kiocb *req, s32 res)
__must_hold(&ctx->uring_lock)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_cold_def *def = &io_cold_defs[req->opcode];
lockdep_assert_held(&req->ctx->uring_lock);
@ -1076,7 +1112,7 @@ __cold void io_free_req(struct io_kiocb *req)
io_req_put_rsrc(req);
io_dismantle_req(req);
io_put_task(req->task, 1);
io_put_task_remote(req->task, 1);
spin_lock(&ctx->completion_lock);
wq_list_add_head(&req->comp_list, &ctx->locked_free_list);
@ -1130,7 +1166,7 @@ static unsigned int handle_tw_list(struct llist_node *node,
{
unsigned int count = 0;
while (node != last) {
while (node && node != last) {
struct llist_node *next = node->next;
struct io_kiocb *req = container_of(node, struct io_kiocb,
io_task_work.node);
@ -1143,10 +1179,16 @@ static unsigned int handle_tw_list(struct llist_node *node,
/* if not contended, grab and improve batching */
*locked = mutex_trylock(&(*ctx)->uring_lock);
percpu_ref_get(&(*ctx)->refs);
}
} else if (!*locked)
*locked = mutex_trylock(&(*ctx)->uring_lock);
req->io_task_work.func(req, locked);
node = next;
count++;
if (unlikely(need_resched())) {
ctx_flush_and_put(*ctx, locked);
*ctx = NULL;
cond_resched();
}
}
return count;
@ -1190,23 +1232,29 @@ void tctx_task_work(struct callback_head *cb)
task_work);
struct llist_node fake = {};
struct llist_node *node;
unsigned int loops = 1;
unsigned int count;
unsigned int loops = 0;
unsigned int count = 0;
if (unlikely(current->flags & PF_EXITING)) {
io_fallback_tw(tctx);
return;
}
node = io_llist_xchg(&tctx->task_list, &fake);
count = handle_tw_list(node, &ctx, &uring_locked, NULL);
node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
while (node != &fake) {
do {
loops++;
node = io_llist_xchg(&tctx->task_list, &fake);
count += handle_tw_list(node, &ctx, &uring_locked, &fake);
/* skip expensive cmpxchg if there are items in the list */
if (READ_ONCE(tctx->task_list.first) != &fake)
continue;
if (uring_locked && !wq_list_empty(&ctx->submit_state.compl_reqs)) {
io_submit_flush_completions(ctx);
if (READ_ONCE(tctx->task_list.first) != &fake)
continue;
}
node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
}
} while (node != &fake);
ctx_flush_and_put(ctx, &uring_locked);
@ -1241,7 +1289,7 @@ static void io_req_local_work_add(struct io_kiocb *req)
percpu_ref_put(&ctx->refs);
return;
}
/* need it for the following io_cqring_wake() */
/* needed for the following wake up */
smp_mb__after_atomic();
if (unlikely(atomic_read(&req->task->io_uring->in_idle))) {
@ -1252,10 +1300,11 @@ static void io_req_local_work_add(struct io_kiocb *req)
if (ctx->flags & IORING_SETUP_TASKRUN_FLAG)
atomic_or(IORING_SQ_TASKRUN, &ctx->rings->sq_flags);
if (ctx->has_evfd)
io_eventfd_signal(ctx);
__io_cqring_wake(ctx);
if (READ_ONCE(ctx->cq_waiting))
wake_up_state(ctx->submitter_task, TASK_INTERRUPTIBLE);
percpu_ref_put(&ctx->refs);
}
@ -1296,21 +1345,19 @@ static void __cold io_move_task_work_from_local(struct io_ring_ctx *ctx)
}
}
int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked)
static int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked)
{
struct llist_node *node;
struct llist_node fake;
struct llist_node *current_final = NULL;
int ret;
unsigned int loops = 1;
unsigned int loops = 0;
int ret = 0;
if (unlikely(ctx->submitter_task != current))
if (WARN_ON_ONCE(ctx->submitter_task != current))
return -EEXIST;
node = io_llist_xchg(&ctx->work_llist, &fake);
ret = 0;
if (ctx->flags & IORING_SETUP_TASKRUN_FLAG)
atomic_andnot(IORING_SQ_TASKRUN, &ctx->rings->sq_flags);
again:
while (node != current_final) {
node = io_llist_xchg(&ctx->work_llist, NULL);
while (node) {
struct llist_node *next = node->next;
struct io_kiocb *req = container_of(node, struct io_kiocb,
io_task_work.node);
@ -1319,26 +1366,20 @@ again:
ret++;
node = next;
}
loops++;
if (ctx->flags & IORING_SETUP_TASKRUN_FLAG)
atomic_andnot(IORING_SQ_TASKRUN, &ctx->rings->sq_flags);
node = io_llist_cmpxchg(&ctx->work_llist, &fake, NULL);
if (node != &fake) {
loops++;
current_final = &fake;
node = io_llist_xchg(&ctx->work_llist, &fake);
if (!llist_empty(&ctx->work_llist))
goto again;
}
if (*locked)
if (*locked) {
io_submit_flush_completions(ctx);
if (!llist_empty(&ctx->work_llist))
goto again;
}
trace_io_uring_local_work_run(ctx, ret, loops);
return ret;
}
int io_run_local_work(struct io_ring_ctx *ctx)
static inline int io_run_local_work_locked(struct io_ring_ctx *ctx)
{
bool locked;
int ret;
@ -1346,8 +1387,19 @@ int io_run_local_work(struct io_ring_ctx *ctx)
if (llist_empty(&ctx->work_llist))
return 0;
__set_current_state(TASK_RUNNING);
locked = mutex_trylock(&ctx->uring_lock);
locked = true;
ret = __io_run_local_work(ctx, &locked);
/* shouldn't happen! */
if (WARN_ON_ONCE(!locked))
mutex_lock(&ctx->uring_lock);
return ret;
}
static int io_run_local_work(struct io_ring_ctx *ctx)
{
bool locked = mutex_trylock(&ctx->uring_lock);
int ret;
ret = __io_run_local_work(ctx, &locked);
if (locked)
mutex_unlock(&ctx->uring_lock);
@ -1365,10 +1417,12 @@ void io_req_task_submit(struct io_kiocb *req, bool *locked)
{
io_tw_lock(req->ctx, locked);
/* req->task == current here, checking PF_EXITING is safe */
if (likely(!(req->task->flags & PF_EXITING)))
io_queue_sqe(req);
else
if (unlikely(req->task->flags & PF_EXITING))
io_req_defer_failed(req, -EFAULT);
else if (req->flags & REQ_F_FORCE_ASYNC)
io_queue_iowq(req, locked);
else
io_queue_sqe(req);
}
void io_req_task_queue_fail(struct io_kiocb *req, int ret)
@ -1467,7 +1521,7 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
}
}
}
__io_cq_unlock_post(ctx);
__io_cq_unlock_post_flush(ctx);
if (!wq_list_empty(&ctx->submit_state.compl_reqs)) {
io_free_batch_list(ctx, state->compl_reqs.first);
@ -1708,8 +1762,8 @@ unsigned int io_file_get_flags(struct file *file)
bool io_alloc_async_data(struct io_kiocb *req)
{
WARN_ON_ONCE(!io_op_defs[req->opcode].async_size);
req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL);
WARN_ON_ONCE(!io_cold_defs[req->opcode].async_size);
req->async_data = kmalloc(io_cold_defs[req->opcode].async_size, GFP_KERNEL);
if (req->async_data) {
req->flags |= REQ_F_ASYNC_DATA;
return false;
@ -1719,20 +1773,21 @@ bool io_alloc_async_data(struct io_kiocb *req)
int io_req_prep_async(struct io_kiocb *req)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_cold_def *cdef = &io_cold_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
/* assign early for deferred execution for non-fixed file */
if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE))
req->file = io_file_get_normal(req, req->cqe.fd);
if (!def->prep_async)
if (!cdef->prep_async)
return 0;
if (WARN_ON_ONCE(req_has_async_data(req)))
return -EFAULT;
if (!io_op_defs[req->opcode].manual_alloc) {
if (!def->manual_alloc) {
if (io_alloc_async_data(req))
return -EAGAIN;
}
return def->prep_async(req);
return cdef->prep_async(req);
}
static u32 io_get_sequence(struct io_kiocb *req)
@ -1796,7 +1851,7 @@ static void io_clean_op(struct io_kiocb *req)
}
if (req->flags & REQ_F_NEED_CLEANUP) {
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_cold_def *def = &io_cold_defs[req->opcode];
if (def->cleanup)
def->cleanup(req);
@ -1820,9 +1875,10 @@ static void io_clean_op(struct io_kiocb *req)
req->flags &= ~IO_REQ_CLEAN_FLAGS;
}
static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags)
static bool io_assign_file(struct io_kiocb *req, const struct io_issue_def *def,
unsigned int issue_flags)
{
if (req->file || !io_op_defs[req->opcode].needs_file)
if (req->file || !def->needs_file)
return true;
if (req->flags & REQ_F_FIXED_FILE)
@ -1835,11 +1891,11 @@ static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags)
static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
const struct cred *creds = NULL;
int ret;
if (unlikely(!io_assign_file(req, issue_flags)))
if (unlikely(!io_assign_file(req, def, issue_flags)))
return -EBADF;
if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred()))
@ -1889,7 +1945,7 @@ struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
void io_wq_submit_work(struct io_wq_work *work)
{
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
unsigned int issue_flags = IO_URING_F_UNLOCKED | IO_URING_F_IOWQ;
bool needs_poll = false;
int ret = 0, err = -ECANCELED;
@ -1908,7 +1964,7 @@ fail:
io_req_task_queue_fail(req, err);
return;
}
if (!io_assign_file(req, issue_flags)) {
if (!io_assign_file(req, def, issue_flags)) {
err = -EBADF;
work->flags |= IO_WQ_WORK_CANCEL;
goto fail;
@ -2104,7 +2160,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
const struct io_uring_sqe *sqe)
__must_hold(&ctx->uring_lock)
{
const struct io_op_def *def;
const struct io_issue_def *def;
unsigned int sqe_flags;
int personality;
u8 opcode;
@ -2122,7 +2178,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
req->opcode = 0;
return -EINVAL;
}
def = &io_op_defs[opcode];
def = &io_issue_defs[opcode];
if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) {
/* enforce forwards compatibility on users */
if (sqe_flags & ~SQE_VALID_FLAGS)
@ -2333,7 +2389,7 @@ 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 const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
static bool io_get_sqe(struct io_ring_ctx *ctx, const struct io_uring_sqe **sqe)
{
unsigned head, mask = ctx->sq_entries - 1;
unsigned sq_idx = ctx->cached_sq_head++ & mask;
@ -2351,14 +2407,15 @@ static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
/* double index for 128-byte SQEs, twice as long */
if (ctx->flags & IORING_SETUP_SQE128)
head <<= 1;
return &ctx->sq_sqes[head];
*sqe = &ctx->sq_sqes[head];
return true;
}
/* drop invalid entries */
ctx->cq_extra--;
WRITE_ONCE(ctx->rings->sq_dropped,
READ_ONCE(ctx->rings->sq_dropped) + 1);
return NULL;
return false;
}
int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
@ -2379,11 +2436,9 @@ int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
const struct io_uring_sqe *sqe;
struct io_kiocb *req;
if (unlikely(!io_alloc_req_refill(ctx)))
if (unlikely(!io_alloc_req(ctx, &req)))
break;
req = io_alloc_req(ctx);
sqe = io_get_sqe(ctx);
if (unlikely(!sqe)) {
if (unlikely(!io_get_sqe(ctx, &sqe))) {
io_req_add_to_cache(req, ctx);
break;
}
@ -2418,13 +2473,13 @@ struct io_wait_queue {
struct io_ring_ctx *ctx;
unsigned cq_tail;
unsigned nr_timeouts;
ktime_t timeout;
};
static inline bool io_has_work(struct io_ring_ctx *ctx)
{
return test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq) ||
((ctx->flags & IORING_SETUP_DEFER_TASKRUN) &&
!llist_empty(&ctx->work_llist));
!llist_empty(&ctx->work_llist);
}
static inline bool io_should_wake(struct io_wait_queue *iowq)
@ -2443,22 +2498,25 @@ static inline bool io_should_wake(struct io_wait_queue *iowq)
static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
int wake_flags, void *key)
{
struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue,
wq);
struct io_ring_ctx *ctx = iowq->ctx;
struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, wq);
/*
* Cannot safely flush overflowed CQEs from here, ensure we wake up
* the task, and the next invocation will do it.
*/
if (io_should_wake(iowq) || io_has_work(ctx))
if (io_should_wake(iowq) || io_has_work(iowq->ctx))
return autoremove_wake_function(curr, mode, wake_flags, key);
return -1;
}
int io_run_task_work_sig(struct io_ring_ctx *ctx)
{
if (io_run_task_work_ctx(ctx) > 0)
if (!llist_empty(&ctx->work_llist)) {
__set_current_state(TASK_RUNNING);
if (io_run_local_work(ctx) > 0)
return 1;
}
if (io_run_task_work() > 0)
return 1;
if (task_sigpending(current))
return -EINTR;
@ -2467,35 +2525,23 @@ int io_run_task_work_sig(struct io_ring_ctx *ctx)
/* when returns >0, the caller should retry */
static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t *timeout)
struct io_wait_queue *iowq)
{
int ret;
unsigned long check_cq;
/* make sure we run task_work before checking for signals */
ret = io_run_task_work_sig(ctx);
if (ret || io_should_wake(iowq))
return ret;
check_cq = READ_ONCE(ctx->check_cq);
if (unlikely(check_cq)) {
/* let the caller flush overflows, retry */
if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT))
return 1;
if (check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT))
return -EBADR;
}
if (!schedule_hrtimeout(timeout, HRTIMER_MODE_ABS))
if (unlikely(READ_ONCE(ctx->check_cq)))
return 1;
if (unlikely(!llist_empty(&ctx->work_llist)))
return 1;
if (unlikely(test_thread_flag(TIF_NOTIFY_SIGNAL)))
return 1;
if (unlikely(task_sigpending(current)))
return -EINTR;
if (unlikely(io_should_wake(iowq)))
return 0;
if (iowq->timeout == KTIME_MAX)
schedule();
else if (!schedule_hrtimeout(&iowq->timeout, HRTIMER_MODE_ABS))
return -ETIME;
/*
* Run task_work after scheduling. If we got woken because of
* task_work being processed, run it now rather than let the caller
* do another wait loop.
*/
ret = io_run_task_work_sig(ctx);
return ret < 0 ? ret : 1;
return 0;
}
/*
@ -2508,23 +2554,17 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
{
struct io_wait_queue iowq;
struct io_rings *rings = ctx->rings;
ktime_t timeout = KTIME_MAX;
int ret;
if (!io_allowed_run_tw(ctx))
return -EEXIST;
do {
/* always run at least 1 task work to process local work */
ret = io_run_task_work_ctx(ctx);
if (ret < 0)
return ret;
io_cqring_overflow_flush(ctx);
/* if user messes with these they will just get an early return */
if (__io_cqring_events_user(ctx) >= min_events)
return 0;
} while (ret > 0);
if (!llist_empty(&ctx->work_llist))
io_run_local_work(ctx);
io_run_task_work();
io_cqring_overflow_flush(ctx);
/* if user messes with these they will just get an early return */
if (__io_cqring_events_user(ctx) >= min_events)
return 0;
if (sig) {
#ifdef CONFIG_COMPAT
@ -2539,36 +2579,69 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return ret;
}
if (uts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
return -EFAULT;
timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
}
init_waitqueue_func_entry(&iowq.wq, io_wake_function);
iowq.wq.private = current;
INIT_LIST_HEAD(&iowq.wq.entry);
iowq.ctx = ctx;
iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
iowq.timeout = KTIME_MAX;
if (uts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
return -EFAULT;
iowq.timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
}
trace_io_uring_cqring_wait(ctx, min_events);
do {
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) {
finish_wait(&ctx->cq_wait, &iowq.wq);
io_cqring_do_overflow_flush(ctx);
}
prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq,
TASK_INTERRUPTIBLE);
ret = io_cqring_wait_schedule(ctx, &iowq, &timeout);
if (__io_cqring_events_user(ctx) >= min_events)
break;
cond_resched();
} while (ret > 0);
unsigned long check_cq;
finish_wait(&ctx->cq_wait, &iowq.wq);
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
WRITE_ONCE(ctx->cq_waiting, 1);
set_current_state(TASK_INTERRUPTIBLE);
} else {
prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq,
TASK_INTERRUPTIBLE);
}
ret = io_cqring_wait_schedule(ctx, &iowq);
__set_current_state(TASK_RUNNING);
WRITE_ONCE(ctx->cq_waiting, 0);
if (ret < 0)
break;
/*
* Run task_work after scheduling and before io_should_wake().
* If we got woken because of task_work being processed, run it
* now rather than let the caller do another wait loop.
*/
io_run_task_work();
if (!llist_empty(&ctx->work_llist))
io_run_local_work(ctx);
check_cq = READ_ONCE(ctx->check_cq);
if (unlikely(check_cq)) {
/* let the caller flush overflows, retry */
if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT))
io_cqring_do_overflow_flush(ctx);
if (check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT)) {
ret = -EBADR;
break;
}
}
if (io_should_wake(&iowq)) {
ret = 0;
break;
}
cond_resched();
} while (1);
if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
finish_wait(&ctx->cq_wait, &iowq.wq);
restore_saved_sigmask_unless(ret == -EINTR);
return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
@ -2683,14 +2756,14 @@ static int io_eventfd_unregister(struct io_ring_ctx *ctx)
static void io_req_caches_free(struct io_ring_ctx *ctx)
{
struct io_kiocb *req;
int nr = 0;
mutex_lock(&ctx->uring_lock);
io_flush_cached_locked_reqs(ctx, &ctx->submit_state);
while (!io_req_cache_empty(ctx)) {
struct io_kiocb *req = io_alloc_req(ctx);
req = io_extract_req(ctx);
kmem_cache_free(req_cachep, req);
nr++;
}
@ -2762,12 +2835,54 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
kfree(ctx);
}
static __cold void io_activate_pollwq_cb(struct callback_head *cb)
{
struct io_ring_ctx *ctx = container_of(cb, struct io_ring_ctx,
poll_wq_task_work);
mutex_lock(&ctx->uring_lock);
ctx->poll_activated = true;
mutex_unlock(&ctx->uring_lock);
/*
* Wake ups for some events between start of polling and activation
* might've been lost due to loose synchronisation.
*/
wake_up_all(&ctx->poll_wq);
percpu_ref_put(&ctx->refs);
}
static __cold void io_activate_pollwq(struct io_ring_ctx *ctx)
{
spin_lock(&ctx->completion_lock);
/* already activated or in progress */
if (ctx->poll_activated || ctx->poll_wq_task_work.func)
goto out;
if (WARN_ON_ONCE(!ctx->task_complete))
goto out;
if (!ctx->submitter_task)
goto out;
/*
* with ->submitter_task only the submitter task completes requests, we
* only need to sync with it, which is done by injecting a tw
*/
init_task_work(&ctx->poll_wq_task_work, io_activate_pollwq_cb);
percpu_ref_get(&ctx->refs);
if (task_work_add(ctx->submitter_task, &ctx->poll_wq_task_work, TWA_SIGNAL))
percpu_ref_put(&ctx->refs);
out:
spin_unlock(&ctx->completion_lock);
}
static __poll_t io_uring_poll(struct file *file, poll_table *wait)
{
struct io_ring_ctx *ctx = file->private_data;
__poll_t mask = 0;
poll_wait(file, &ctx->cq_wait, wait);
if (unlikely(!ctx->poll_activated))
io_activate_pollwq(ctx);
poll_wait(file, &ctx->poll_wq, wait);
/*
* synchronizes with barrier from wq_has_sleeper call in
* io_commit_cqring
@ -2790,7 +2905,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
* pushes them to do the flush.
*/
if (io_cqring_events(ctx) || io_has_work(ctx))
if (__io_cqring_events_user(ctx) || io_has_work(ctx))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;
@ -3053,10 +3168,12 @@ static __cold bool io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
while (!wq_list_empty(&ctx->iopoll_list)) {
io_iopoll_try_reap_events(ctx);
ret = true;
cond_resched();
}
}
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN)
if ((ctx->flags & IORING_SETUP_DEFER_TASKRUN) &&
io_allowed_defer_tw_run(ctx))
ret |= io_run_local_work(ctx) > 0;
ret |= io_cancel_defer_files(ctx, task, cancel_all);
mutex_lock(&ctx->uring_lock);
@ -3328,11 +3445,9 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
}
if (flags & IORING_ENTER_SQ_WAKEUP)
wake_up(&ctx->sq_data->wait);
if (flags & IORING_ENTER_SQ_WAIT) {
ret = io_sqpoll_wait_sq(ctx);
if (ret)
goto out;
}
if (flags & IORING_ENTER_SQ_WAIT)
io_sqpoll_wait_sq(ctx);
ret = to_submit;
} else if (to_submit) {
ret = io_uring_add_tctx_node(ctx);
@ -3572,6 +3687,13 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
!(ctx->flags & IORING_SETUP_SQPOLL))
ctx->task_complete = true;
/*
* lazy poll_wq activation relies on ->task_complete for synchronisation
* purposes, see io_activate_pollwq()
*/
if (!ctx->task_complete)
ctx->poll_activated = true;
/*
* When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user
* space applications don't need to do io completion events
@ -3663,7 +3785,7 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED |
IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS |
IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP |
IORING_FEAT_LINKED_FILE;
IORING_FEAT_LINKED_FILE | IORING_FEAT_REG_REG_RING;
if (copy_to_user(params, p, sizeof(*p))) {
ret = -EFAULT;
@ -3760,7 +3882,7 @@ static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg,
for (i = 0; i < nr_args; i++) {
p->ops[i].op = i;
if (!io_op_defs[i].not_supported)
if (!io_issue_defs[i].not_supported)
p->ops[i].flags = IO_URING_OP_SUPPORTED;
}
p->ops_len = i;
@ -3865,8 +3987,15 @@ static int io_register_enable_rings(struct io_ring_ctx *ctx)
if (!(ctx->flags & IORING_SETUP_R_DISABLED))
return -EBADFD;
if (ctx->flags & IORING_SETUP_SINGLE_ISSUER && !ctx->submitter_task)
if (ctx->flags & IORING_SETUP_SINGLE_ISSUER && !ctx->submitter_task) {
WRITE_ONCE(ctx->submitter_task, get_task_struct(current));
/*
* Lazy activation attempts would fail if it was polled before
* submitter_task is set.
*/
if (wq_has_sleeper(&ctx->poll_wq))
io_activate_pollwq(ctx);
}
if (ctx->restrictions.registered)
ctx->restricted = 1;
@ -4177,17 +4306,36 @@ SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
struct io_ring_ctx *ctx;
long ret = -EBADF;
struct fd f;
bool use_registered_ring;
use_registered_ring = !!(opcode & IORING_REGISTER_USE_REGISTERED_RING);
opcode &= ~IORING_REGISTER_USE_REGISTERED_RING;
if (opcode >= IORING_REGISTER_LAST)
return -EINVAL;
f = fdget(fd);
if (!f.file)
return -EBADF;
if (use_registered_ring) {
/*
* Ring fd has been registered via IORING_REGISTER_RING_FDS, we
* need only dereference our task private array to find it.
*/
struct io_uring_task *tctx = current->io_uring;
ret = -EOPNOTSUPP;
if (!io_is_uring_fops(f.file))
goto out_fput;
if (unlikely(!tctx || fd >= IO_RINGFD_REG_MAX))
return -EINVAL;
fd = array_index_nospec(fd, IO_RINGFD_REG_MAX);
f.file = tctx->registered_rings[fd];
f.flags = 0;
if (unlikely(!f.file))
return -EBADF;
} else {
f = fdget(fd);
if (unlikely(!f.file))
return -EBADF;
ret = -EOPNOTSUPP;
if (!io_is_uring_fops(f.file))
goto out_fput;
}
ctx = f.file->private_data;

97
io_uring/io_uring.h
View File

@ -3,6 +3,8 @@
#include <linux/errno.h>
#include <linux/lockdep.h>
#include <linux/resume_user_mode.h>
#include <linux/kasan.h>
#include <linux/io_uring_types.h>
#include <uapi/linux/eventpoll.h>
#include "io-wq.h"
@ -28,8 +30,6 @@ enum {
struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow);
bool io_req_cqe_overflow(struct io_kiocb *req);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked);
int io_run_local_work(struct io_ring_ctx *ctx);
void io_req_defer_failed(struct io_kiocb *req, s32 res);
void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags);
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
@ -72,7 +72,6 @@ void io_wq_submit_work(struct io_wq_work *work);
void io_free_req(struct io_kiocb *req);
void io_queue_next(struct io_kiocb *req);
void __io_put_task(struct task_struct *task, int nr);
void io_task_refs_refill(struct io_uring_task *tctx);
bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
@ -222,6 +221,13 @@ static inline void io_commit_cqring(struct io_ring_ctx *ctx)
smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
}
static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
{
if (wq_has_sleeper(&ctx->poll_wq))
__wake_up(&ctx->poll_wq, TASK_NORMAL, 0,
poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}
/* requires smb_mb() prior, see wq_has_sleeper() */
static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
{
@ -270,6 +276,15 @@ static inline int io_run_task_work(void)
*/
if (test_thread_flag(TIF_NOTIFY_SIGNAL))
clear_notify_signal();
/*
* PF_IO_WORKER never returns to userspace, so check here if we have
* notify work that needs processing.
*/
if (current->flags & PF_IO_WORKER &&
test_thread_flag(TIF_NOTIFY_RESUME)) {
__set_current_state(TASK_RUNNING);
resume_user_mode_work(NULL);
}
if (task_work_pending(current)) {
__set_current_state(TASK_RUNNING);
task_work_run();
@ -284,42 +299,6 @@ static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
return task_work_pending(current) || !wq_list_empty(&ctx->work_llist);
}
static inline int io_run_task_work_ctx(struct io_ring_ctx *ctx)
{
int ret = 0;
int ret2;
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN)
ret = io_run_local_work(ctx);
/* want to run this after in case more is added */
ret2 = io_run_task_work();
/* Try propagate error in favour of if tasks were run,
* but still make sure to run them if requested
*/
if (ret >= 0)
ret += ret2;
return ret;
}
static inline int io_run_local_work_locked(struct io_ring_ctx *ctx)
{
bool locked;
int ret;
if (llist_empty(&ctx->work_llist))
return 0;
locked = true;
ret = __io_run_local_work(ctx, &locked);
/* shouldn't happen! */
if (WARN_ON_ONCE(!locked))
mutex_lock(&ctx->uring_lock);
return ret;
}
static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked)
{
if (!*locked) {
@ -345,19 +324,11 @@ static inline void io_req_complete_defer(struct io_kiocb *req)
static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
{
if (unlikely(ctx->off_timeout_used || ctx->drain_active || ctx->has_evfd))
if (unlikely(ctx->off_timeout_used || ctx->drain_active ||
ctx->has_evfd || ctx->poll_activated))
__io_commit_cqring_flush(ctx);
}
/* must to be called somewhat shortly after putting a request */
static inline void io_put_task(struct task_struct *task, int nr)
{
if (likely(task == current))
task->io_uring->cached_refs += nr;
else
__io_put_task(task, nr);
}
static inline void io_get_task_refs(int nr)
{
struct io_uring_task *tctx = current->io_uring;
@ -372,19 +343,31 @@ static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
return !ctx->submit_state.free_list.next;
}
static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx)
extern struct kmem_cache *req_cachep;
static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx)
{
if (unlikely(io_req_cache_empty(ctx)))
return __io_alloc_req_refill(ctx);
struct io_kiocb *req;
req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list);
kasan_unpoison_object_data(req_cachep, req);
wq_stack_extract(&ctx->submit_state.free_list);
return req;
}
static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req)
{
if (unlikely(io_req_cache_empty(ctx))) {
if (!__io_alloc_req_refill(ctx))
return false;
}
*req = io_extract_req(ctx);
return true;
}
static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx)
{
struct io_wq_work_node *node;
node = wq_stack_extract(&ctx->submit_state.free_list);
return container_of(node, struct io_kiocb, comp_list);
return likely(ctx->submitter_task == current);
}
static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)

31
io_uring/msg_ring.c
View File

@ -13,6 +13,11 @@
#include "filetable.h"
#include "msg_ring.h"
/* All valid masks for MSG_RING */
#define IORING_MSG_RING_MASK (IORING_MSG_RING_CQE_SKIP | \
IORING_MSG_RING_FLAGS_PASS)
struct io_msg {
struct file *file;
struct file *src_file;
@ -21,7 +26,10 @@ struct io_msg {
u32 len;
u32 cmd;
u32 src_fd;
u32 dst_fd;
union {
u32 dst_fd;
u32 cqe_flags;
};
u32 flags;
};
@ -91,6 +99,11 @@ static void io_msg_tw_complete(struct callback_head *head)
if (current->flags & PF_EXITING) {
ret = -EOWNERDEAD;
} else {
u32 flags = 0;
if (msg->flags & IORING_MSG_RING_FLAGS_PASS)
flags = msg->cqe_flags;
/*
* If the target ring is using IOPOLL mode, then we need to be
* holding the uring_lock for posting completions. Other ring
@ -99,7 +112,7 @@ static void io_msg_tw_complete(struct callback_head *head)
*/
if (target_ctx->flags & IORING_SETUP_IOPOLL)
mutex_lock(&target_ctx->uring_lock);
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = -EOVERFLOW;
if (target_ctx->flags & IORING_SETUP_IOPOLL)
mutex_unlock(&target_ctx->uring_lock);
@ -114,9 +127,12 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *target_ctx = req->file->private_data;
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
u32 flags = 0;
int ret;
if (msg->src_fd || msg->dst_fd || msg->flags)
if (msg->src_fd || msg->flags & ~IORING_MSG_RING_FLAGS_PASS)
return -EINVAL;
if (!(msg->flags & IORING_MSG_RING_FLAGS_PASS) && msg->dst_fd)
return -EINVAL;
if (target_ctx->flags & IORING_SETUP_R_DISABLED)
return -EBADFD;
@ -124,15 +140,18 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
if (io_msg_need_remote(target_ctx))
return io_msg_exec_remote(req, io_msg_tw_complete);
if (msg->flags & IORING_MSG_RING_FLAGS_PASS)
flags = msg->cqe_flags;
ret = -EOVERFLOW;
if (target_ctx->flags & IORING_SETUP_IOPOLL) {
if (unlikely(io_double_lock_ctx(target_ctx, issue_flags)))
return -EAGAIN;
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = 0;
io_double_unlock_ctx(target_ctx);
} else {
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = 0;
}
return ret;
@ -241,7 +260,7 @@ int io_msg_ring_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
msg->src_fd = READ_ONCE(sqe->addr3);
msg->dst_fd = READ_ONCE(sqe->file_index);
msg->flags = READ_ONCE(sqe->msg_ring_flags);
if (msg->flags & ~IORING_MSG_RING_CQE_SKIP)
if (msg->flags & ~IORING_MSG_RING_MASK)
return -EINVAL;
return 0;

4
io_uring/net.c
View File

@ -90,6 +90,7 @@ int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return -EINVAL;
shutdown->how = READ_ONCE(sqe->len);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -99,8 +100,7 @@ int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
struct socket *sock;
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
sock = sock_from_file(req->file);
if (unlikely(!sock))

3
io_uring/notif.c
View File

@ -68,9 +68,8 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
struct io_kiocb *notif;
struct io_notif_data *nd;
if (unlikely(!io_alloc_req_refill(ctx)))
if (unlikely(!io_alloc_req(ctx, &notif)))
return NULL;
notif = io_alloc_req(ctx);
notif->opcode = IORING_OP_NOP;
notif->flags = 0;
notif->file = NULL;

340
io_uring/opdef.c
View File

@ -46,11 +46,10 @@ static __maybe_unused int io_eopnotsupp_prep(struct io_kiocb *kiocb,
return -EOPNOTSUPP;
}
const struct io_op_def io_op_defs[] = {
const struct io_issue_def io_issue_defs[] = {
[IORING_OP_NOP] = {
.audit_skip = 1,
.iopoll = 1,
.name = "NOP",
.prep = io_nop_prep,
.issue = io_nop,
},
@ -64,13 +63,8 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READV",
.prep = io_prep_rw,
.issue = io_read,
.prep_async = io_readv_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITEV] = {
.needs_file = 1,
@ -82,18 +76,12 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITEV",
.prep = io_prep_rw,
.issue = io_write,
.prep_async = io_writev_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FSYNC] = {
.needs_file = 1,
.audit_skip = 1,
.name = "FSYNC",
.prep = io_fsync_prep,
.issue = io_fsync,
},
@ -106,11 +94,8 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READ_FIXED",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE_FIXED] = {
.needs_file = 1,
@ -122,30 +107,24 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITE_FIXED",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_POLL_ADD] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "POLL_ADD",
.prep = io_poll_add_prep,
.issue = io_poll_add,
},
[IORING_OP_POLL_REMOVE] = {
.audit_skip = 1,
.name = "POLL_REMOVE",
.prep = io_poll_remove_prep,
.issue = io_poll_remove,
},
[IORING_OP_SYNC_FILE_RANGE] = {
.needs_file = 1,
.audit_skip = 1,
.name = "SYNC_FILE_RANGE",
.prep = io_sfr_prep,
.issue = io_sync_file_range,
},
@ -155,14 +134,9 @@ const struct io_op_def io_op_defs[] = {
.pollout = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "SENDMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_sendmsg_prep,
.issue = io_sendmsg,
.prep_async = io_sendmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
@ -174,29 +148,21 @@ const struct io_op_def io_op_defs[] = {
.buffer_select = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "RECVMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_recvmsg_prep,
.issue = io_recvmsg,
.prep_async = io_recvmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_TIMEOUT] = {
.audit_skip = 1,
.async_size = sizeof(struct io_timeout_data),
.name = "TIMEOUT",
.prep = io_timeout_prep,
.issue = io_timeout,
},
[IORING_OP_TIMEOUT_REMOVE] = {
/* used by timeout updates' prep() */
.audit_skip = 1,
.name = "TIMEOUT_REMOVE",
.prep = io_timeout_remove_prep,
.issue = io_timeout_remove,
},
@ -206,7 +172,6 @@ const struct io_op_def io_op_defs[] = {
.pollin = 1,
.poll_exclusive = 1,
.ioprio = 1, /* used for flags */
.name = "ACCEPT",
#if defined(CONFIG_NET)
.prep = io_accept_prep,
.issue = io_accept,
@ -216,14 +181,11 @@ const struct io_op_def io_op_defs[] = {
},
[IORING_OP_ASYNC_CANCEL] = {
.audit_skip = 1,
.name = "ASYNC_CANCEL",
.prep = io_async_cancel_prep,
.issue = io_async_cancel,
},
[IORING_OP_LINK_TIMEOUT] = {
.audit_skip = 1,
.async_size = sizeof(struct io_timeout_data),
.name = "LINK_TIMEOUT",
.prep = io_link_timeout_prep,
.issue = io_no_issue,
},
@ -231,46 +193,36 @@ const struct io_op_def io_op_defs[] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.name = "CONNECT",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_connect),
.prep = io_connect_prep,
.issue = io_connect,
.prep_async = io_connect_prep_async,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_FALLOCATE] = {
.needs_file = 1,
.name = "FALLOCATE",
.prep = io_fallocate_prep,
.issue = io_fallocate,
},
[IORING_OP_OPENAT] = {
.name = "OPENAT",
.prep = io_openat_prep,
.issue = io_openat,
.cleanup = io_open_cleanup,
},
[IORING_OP_CLOSE] = {
.name = "CLOSE",
.prep = io_close_prep,
.issue = io_close,
},
[IORING_OP_FILES_UPDATE] = {
.audit_skip = 1,
.iopoll = 1,
.name = "FILES_UPDATE",
.prep = io_files_update_prep,
.issue = io_files_update,
},
[IORING_OP_STATX] = {
.audit_skip = 1,
.name = "STATX",
.prep = io_statx_prep,
.issue = io_statx,
.cleanup = io_statx_cleanup,
},
[IORING_OP_READ] = {
.needs_file = 1,
@ -282,11 +234,8 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READ",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE] = {
.needs_file = 1,
@ -298,21 +247,17 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITE",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_FADVISE] = {
.needs_file = 1,
.audit_skip = 1,
.name = "FADVISE",
.prep = io_fadvise_prep,
.issue = io_fadvise,
},
[IORING_OP_MADVISE] = {
.name = "MADVISE",
.audit_skip = 1,
.prep = io_madvise_prep,
.issue = io_madvise,
},
@ -323,13 +268,9 @@ const struct io_op_def io_op_defs[] = {
.audit_skip = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "SEND",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_sendmsg_prep,
.issue = io_send,
.fail = io_sendrecv_fail,
.prep_async = io_send_prep_async,
#else
.prep = io_eopnotsupp_prep,
#endif
@ -341,25 +282,20 @@ const struct io_op_def io_op_defs[] = {
.buffer_select = 1,
.audit_skip = 1,
.ioprio = 1,
.name = "RECV",
#if defined(CONFIG_NET)
.prep = io_recvmsg_prep,
.issue = io_recv,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_OPENAT2] = {
.name = "OPENAT2",
.prep = io_openat2_prep,
.issue = io_openat2,
.cleanup = io_open_cleanup,
},
[IORING_OP_EPOLL_CTL] = {
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "EPOLL",
#if defined(CONFIG_EPOLL)
.prep = io_epoll_ctl_prep,
.issue = io_epoll_ctl,
@ -372,21 +308,18 @@ const struct io_op_def io_op_defs[] = {
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "SPLICE",
.prep = io_splice_prep,
.issue = io_splice,
},
[IORING_OP_PROVIDE_BUFFERS] = {
.audit_skip = 1,
.iopoll = 1,
.name = "PROVIDE_BUFFERS",
.prep = io_provide_buffers_prep,
.issue = io_provide_buffers,
},
[IORING_OP_REMOVE_BUFFERS] = {
.audit_skip = 1,
.iopoll = 1,
.name = "REMOVE_BUFFERS",
.prep = io_remove_buffers_prep,
.issue = io_remove_buffers,
},
@ -395,13 +328,11 @@ const struct io_op_def io_op_defs[] = {
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "TEE",
.prep = io_tee_prep,
.issue = io_tee,
},
[IORING_OP_SHUTDOWN] = {
.needs_file = 1,
.name = "SHUTDOWN",
#if defined(CONFIG_NET)
.prep = io_shutdown_prep,
.issue = io_shutdown,
@ -410,72 +341,51 @@ const struct io_op_def io_op_defs[] = {
#endif
},
[IORING_OP_RENAMEAT] = {
.name = "RENAMEAT",
.prep = io_renameat_prep,
.issue = io_renameat,
.cleanup = io_renameat_cleanup,
},
[IORING_OP_UNLINKAT] = {
.name = "UNLINKAT",
.prep = io_unlinkat_prep,
.issue = io_unlinkat,
.cleanup = io_unlinkat_cleanup,
},
[IORING_OP_MKDIRAT] = {
.name = "MKDIRAT",
.prep = io_mkdirat_prep,
.issue = io_mkdirat,
.cleanup = io_mkdirat_cleanup,
},
[IORING_OP_SYMLINKAT] = {
.name = "SYMLINKAT",
.prep = io_symlinkat_prep,
.issue = io_symlinkat,
.cleanup = io_link_cleanup,
},
[IORING_OP_LINKAT] = {
.name = "LINKAT",
.prep = io_linkat_prep,
.issue = io_linkat,
.cleanup = io_link_cleanup,
},
[IORING_OP_MSG_RING] = {
.needs_file = 1,
.iopoll = 1,
.name = "MSG_RING",
.prep = io_msg_ring_prep,
.issue = io_msg_ring,
.cleanup = io_msg_ring_cleanup,
},
[IORING_OP_FSETXATTR] = {
.needs_file = 1,
.name = "FSETXATTR",
.prep = io_fsetxattr_prep,
.issue = io_fsetxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SETXATTR] = {
.name = "SETXATTR",
.prep = io_setxattr_prep,
.issue = io_setxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_FGETXATTR] = {
.needs_file = 1,
.name = "FGETXATTR",
.prep = io_fgetxattr_prep,
.issue = io_fgetxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_GETXATTR] = {
.name = "GETXATTR",
.prep = io_getxattr_prep,
.issue = io_getxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SOCKET] = {
.audit_skip = 1,
.name = "SOCKET",
#if defined(CONFIG_NET)
.prep = io_socket_prep,
.issue = io_socket,
@ -486,16 +396,12 @@ const struct io_op_def io_op_defs[] = {
[IORING_OP_URING_CMD] = {
.needs_file = 1,
.plug = 1,
.name = "URING_CMD",
.iopoll = 1,
.iopoll_queue = 1,
.async_size = uring_cmd_pdu_size(1),
.prep = io_uring_cmd_prep,
.issue = io_uring_cmd,
.prep_async = io_uring_cmd_prep_async,
},
[IORING_OP_SEND_ZC] = {
.name = "SEND_ZC",
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
@ -503,32 +409,243 @@ const struct io_op_def io_op_defs[] = {
.ioprio = 1,
.manual_alloc = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_send_zc_prep,
.issue = io_send_zc,
.prep_async = io_send_prep_async,
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_SENDMSG_ZC] = {
.name = "SENDMSG_ZC",
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.ioprio = 1,
.manual_alloc = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_send_zc_prep,
.issue = io_sendmsg_zc,
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
const struct io_cold_def io_cold_defs[] = {
[IORING_OP_NOP] = {
.name = "NOP",
},
[IORING_OP_READV] = {
.async_size = sizeof(struct io_async_rw),
.name = "READV",
.prep_async = io_readv_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITEV] = {
.async_size = sizeof(struct io_async_rw),
.name = "WRITEV",
.prep_async = io_writev_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FSYNC] = {
.name = "FSYNC",
},
[IORING_OP_READ_FIXED] = {
.async_size = sizeof(struct io_async_rw),
.name = "READ_FIXED",
.fail = io_rw_fail,
},
[IORING_OP_WRITE_FIXED] = {
.async_size = sizeof(struct io_async_rw),
.name = "WRITE_FIXED",
.fail = io_rw_fail,
},
[IORING_OP_POLL_ADD] = {
.name = "POLL_ADD",
},
[IORING_OP_POLL_REMOVE] = {
.name = "POLL_REMOVE",
},
[IORING_OP_SYNC_FILE_RANGE] = {
.name = "SYNC_FILE_RANGE",
},
[IORING_OP_SENDMSG] = {
.name = "SENDMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep_async = io_sendmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_RECVMSG] = {
.name = "RECVMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep_async = io_recvmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_TIMEOUT] = {
.async_size = sizeof(struct io_timeout_data),
.name = "TIMEOUT",
},
[IORING_OP_TIMEOUT_REMOVE] = {
.name = "TIMEOUT_REMOVE",
},
[IORING_OP_ACCEPT] = {
.name = "ACCEPT",
},
[IORING_OP_ASYNC_CANCEL] = {
.name = "ASYNC_CANCEL",
},
[IORING_OP_LINK_TIMEOUT] = {
.async_size = sizeof(struct io_timeout_data),
.name = "LINK_TIMEOUT",
},
[IORING_OP_CONNECT] = {
.name = "CONNECT",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_connect),
.prep_async = io_connect_prep_async,
#endif
},
[IORING_OP_FALLOCATE] = {
.name = "FALLOCATE",
},
[IORING_OP_OPENAT] = {
.name = "OPENAT",
.cleanup = io_open_cleanup,
},
[IORING_OP_CLOSE] = {
.name = "CLOSE",
},
[IORING_OP_FILES_UPDATE] = {
.name = "FILES_UPDATE",
},
[IORING_OP_STATX] = {
.name = "STATX",
.cleanup = io_statx_cleanup,
},
[IORING_OP_READ] = {
.async_size = sizeof(struct io_async_rw),
.name = "READ",
.fail = io_rw_fail,
},
[IORING_OP_WRITE] = {
.async_size = sizeof(struct io_async_rw),
.name = "WRITE",
.fail = io_rw_fail,
},
[IORING_OP_FADVISE] = {
.name = "FADVISE",
},
[IORING_OP_MADVISE] = {
.name = "MADVISE",
},
[IORING_OP_SEND] = {
.name = "SEND",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.fail = io_sendrecv_fail,
.prep_async = io_send_prep_async,
#endif
},
[IORING_OP_RECV] = {
.name = "RECV",
#if defined(CONFIG_NET)
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_OPENAT2] = {
.name = "OPENAT2",
.cleanup = io_open_cleanup,
},
[IORING_OP_EPOLL_CTL] = {
.name = "EPOLL",
},
[IORING_OP_SPLICE] = {
.name = "SPLICE",
},
[IORING_OP_PROVIDE_BUFFERS] = {
.name = "PROVIDE_BUFFERS",
},
[IORING_OP_REMOVE_BUFFERS] = {
.name = "REMOVE_BUFFERS",
},
[IORING_OP_TEE] = {
.name = "TEE",
},
[IORING_OP_SHUTDOWN] = {
.name = "SHUTDOWN",
},
[IORING_OP_RENAMEAT] = {
.name = "RENAMEAT",
.cleanup = io_renameat_cleanup,
},
[IORING_OP_UNLINKAT] = {
.name = "UNLINKAT",
.cleanup = io_unlinkat_cleanup,
},
[IORING_OP_MKDIRAT] = {
.name = "MKDIRAT",
.cleanup = io_mkdirat_cleanup,
},
[IORING_OP_SYMLINKAT] = {
.name = "SYMLINKAT",
.cleanup = io_link_cleanup,
},
[IORING_OP_LINKAT] = {
.name = "LINKAT",
.cleanup = io_link_cleanup,
},
[IORING_OP_MSG_RING] = {
.name = "MSG_RING",
.cleanup = io_msg_ring_cleanup,
},
[IORING_OP_FSETXATTR] = {
.name = "FSETXATTR",
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SETXATTR] = {
.name = "SETXATTR",
.cleanup = io_xattr_cleanup,
},
[IORING_OP_FGETXATTR] = {
.name = "FGETXATTR",
.cleanup = io_xattr_cleanup,
},
[IORING_OP_GETXATTR] = {
.name = "GETXATTR",
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SOCKET] = {
.name = "SOCKET",
},
[IORING_OP_URING_CMD] = {
.name = "URING_CMD",
.async_size = uring_cmd_pdu_size(1),
.prep_async = io_uring_cmd_prep_async,
},
[IORING_OP_SEND_ZC] = {
.name = "SEND_ZC",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep_async = io_send_prep_async,
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_SENDMSG_ZC] = {
.name = "SENDMSG_ZC",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep_async = io_sendmsg_prep_async,
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
@ -536,7 +653,7 @@ const struct io_op_def io_op_defs[] = {
const char *io_uring_get_opcode(u8 opcode)
{
if (opcode < IORING_OP_LAST)
return io_op_defs[opcode].name;
return io_cold_defs[opcode].name;
return "INVALID";
}
@ -544,12 +661,13 @@ void __init io_uring_optable_init(void)
{
int i;
BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
BUILD_BUG_ON(ARRAY_SIZE(io_cold_defs) != IORING_OP_LAST);
BUILD_BUG_ON(ARRAY_SIZE(io_issue_defs) != IORING_OP_LAST);
for (i = 0; i < ARRAY_SIZE(io_op_defs); i++) {
BUG_ON(!io_op_defs[i].prep);
if (io_op_defs[i].prep != io_eopnotsupp_prep)
BUG_ON(!io_op_defs[i].issue);
WARN_ON_ONCE(!io_op_defs[i].name);
for (i = 0; i < ARRAY_SIZE(io_issue_defs); i++) {
BUG_ON(!io_issue_defs[i].prep);
if (io_issue_defs[i].prep != io_eopnotsupp_prep)
BUG_ON(!io_issue_defs[i].issue);
WARN_ON_ONCE(!io_cold_defs[i].name);
}
}

13
io_uring/opdef.h
View File

@ -2,7 +2,7 @@
#ifndef IOU_OP_DEF_H
#define IOU_OP_DEF_H
struct io_op_def {
struct io_issue_def {
/* needs req->file assigned */
unsigned needs_file : 1;
/* should block plug */
@ -29,19 +29,24 @@ struct io_op_def {
unsigned iopoll_queue : 1;
/* opcode specific path will handle ->async_data allocation if needed */
unsigned manual_alloc : 1;
int (*issue)(struct io_kiocb *, unsigned int);
int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
};
struct io_cold_def {
/* size of async data needed, if any */
unsigned short async_size;
const char *name;
int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
int (*issue)(struct io_kiocb *, unsigned int);
int (*prep_async)(struct io_kiocb *);
void (*cleanup)(struct io_kiocb *);
void (*fail)(struct io_kiocb *);
};
extern const struct io_op_def io_op_defs[];
extern const struct io_issue_def io_issue_defs[];
extern const struct io_cold_def io_cold_defs[];
void io_uring_optable_init(void);
#endif

18
io_uring/openclose.c
View File

@ -31,6 +31,15 @@ struct io_close {
u32 file_slot;
};
static bool io_openat_force_async(struct io_open *open)
{
/*
* Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open,
* it'll always -EAGAIN
*/
return open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE);
}
static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_open *open = io_kiocb_to_cmd(req, struct io_open);
@ -61,6 +70,8 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
open->nofile = rlimit(RLIMIT_NOFILE);
req->flags |= REQ_F_NEED_CLEANUP;
if (io_openat_force_async(open))
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -108,12 +119,7 @@ int io_openat2(struct io_kiocb *req, unsigned int issue_flags)
nonblock_set = op.open_flag & O_NONBLOCK;
resolve_nonblock = open->how.resolve & RESOLVE_CACHED;
if (issue_flags & IO_URING_F_NONBLOCK) {
/*
* Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open,
* it'll always -EAGAIN
*/
if (open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE))
return -EAGAIN;
WARN_ON_ONCE(io_openat_force_async(open));
op.lookup_flags |= LOOKUP_CACHED;
op.open_flag |= O_NONBLOCK;
}

2
io_uring/poll.c
View File

@ -678,7 +678,7 @@ alloc_apoll:
int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
struct async_poll *apoll;
struct io_poll_table ipt;
__poll_t mask = POLLPRI | POLLERR | EPOLLET;

4
io_uring/rw.c
View File

@ -410,7 +410,7 @@ static inline int io_import_iovec(int rw, struct io_kiocb *req,
unsigned int issue_flags)
{
*iovec = __io_import_iovec(rw, req, s, issue_flags);
if (unlikely(IS_ERR(*iovec)))
if (IS_ERR(*iovec))
return PTR_ERR(*iovec);
iov_iter_save_state(&s->iter, &s->iter_state);
@ -516,7 +516,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
struct io_rw_state *s, bool force)
{
if (!force && !io_op_defs[req->opcode].prep_async)
if (!force && !io_cold_defs[req->opcode].prep_async)
return 0;
if (!req_has_async_data(req)) {
struct io_async_rw *iorw;

7
io_uring/splice.c
View File

@ -34,6 +34,7 @@ static int __io_splice_prep(struct io_kiocb *req,
if (unlikely(sp->flags & ~valid_flags))
return -EINVAL;
sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -52,8 +53,7 @@ int io_tee(struct io_kiocb *req, unsigned int issue_flags)
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
@ -94,8 +94,7 @@ int io_splice(struct io_kiocb *req, unsigned int issue_flags)
struct file *in;
long ret = 0;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
if (sp->flags & SPLICE_F_FD_IN_FIXED)
in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);

3
io_uring/sqpoll.c
View File

@ -312,7 +312,7 @@ static int io_sq_thread(void *data)
do_exit(0);
}
int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
void io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
{
DEFINE_WAIT(wait);
@ -327,7 +327,6 @@ int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
} while (!signal_pending(current));
finish_wait(&ctx->sqo_sq_wait, &wait);
return 0;
}
__cold int io_sq_offload_create(struct io_ring_ctx *ctx,

2
io_uring/sqpoll.h
View File

@ -26,4 +26,4 @@ void io_sq_thread_stop(struct io_sq_data *sqd);
void io_sq_thread_park(struct io_sq_data *sqd);
void io_sq_thread_unpark(struct io_sq_data *sqd);
void io_put_sq_data(struct io_sq_data *sqd);
int io_sqpoll_wait_sq(struct io_ring_ctx *ctx);
void io_sqpoll_wait_sq(struct io_ring_ctx *ctx);

4
io_uring/statx.c
View File

@ -48,6 +48,7 @@ int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -56,8 +57,7 @@ int io_statx(struct io_kiocb *req, unsigned int issue_flags)
struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
io_req_set_res(req, ret, 0);

14
io_uring/sync.c
View File

@ -32,6 +32,8 @@ int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sync->off = READ_ONCE(sqe->off);
sync->len = READ_ONCE(sqe->len);
sync->flags = READ_ONCE(sqe->sync_range_flags);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -41,8 +43,7 @@ int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
int ret;
/* sync_file_range always requires a blocking context */
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);
io_req_set_res(req, ret, 0);
@ -62,6 +63,7 @@ int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sync->off = READ_ONCE(sqe->off);
sync->len = READ_ONCE(sqe->len);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -72,8 +74,7 @@ int io_fsync(struct io_kiocb *req, unsigned int issue_flags)
int ret;
/* fsync always requires a blocking context */
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX,
sync->flags & IORING_FSYNC_DATASYNC);
@ -91,6 +92,7 @@ int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sync->off = READ_ONCE(sqe->off);
sync->len = READ_ONCE(sqe->addr);
sync->mode = READ_ONCE(sqe->len);
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -100,8 +102,8 @@ int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
int ret;
/* fallocate always requiring blocking context */
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len);
if (ret >= 0)
fsnotify_modify(req->file);

14
io_uring/xattr.c
View File

@ -75,6 +75,7 @@ static int __io_getxattr_prep(struct io_kiocb *req,
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -109,8 +110,7 @@ int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_getxattr(mnt_idmap(req->file->f_path.mnt),
req->file->f_path.dentry,
@ -127,8 +127,7 @@ int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
struct path path;
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
retry:
ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
@ -174,6 +173,7 @@ static int __io_setxattr_prep(struct io_kiocb *req,
}
req->flags |= REQ_F_NEED_CLEANUP;
req->flags |= REQ_F_FORCE_ASYNC;
return 0;
}
@ -222,8 +222,7 @@ int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
{
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = __io_setxattr(req, issue_flags, &req->file->f_path);
io_xattr_finish(req, ret);
@ -237,8 +236,7 @@ int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
struct path path;
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
retry:
ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);