#include <linux/compat.h>
#include <linux/refcount.h>
#include <linux/uio.h>
+#include <linux/bits.h>
#include <linux/sched/signal.h>
#include <linux/fs.h>
#include <linux/sizes.h>
#include <linux/hugetlb.h>
#include <linux/highmem.h>
+#include <linux/namei.h>
+#include <linux/fsnotify.h>
+#include <linux/fadvise.h>
+#include <linux/eventpoll.h>
#define CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>
struct file **files;
};
+enum {
+ FFD_F_ATOMIC,
+};
+
+struct fixed_file_data {
+ struct fixed_file_table *table;
+ struct io_ring_ctx *ctx;
+
+ struct percpu_ref refs;
+ struct llist_head put_llist;
+ unsigned long state;
+ struct work_struct ref_work;
+ struct completion done;
+};
+
struct io_ring_ctx {
struct {
struct percpu_ref refs;
struct {
unsigned int flags;
- bool compat;
- bool account_mem;
- bool cq_overflow_flushed;
- bool drain_next;
+ int compat: 1;
+ int account_mem: 1;
+ int cq_overflow_flushed: 1;
+ int drain_next: 1;
+ int eventfd_async: 1;
/*
* Ring buffer of indices into array of io_uring_sqe, which is
unsigned sq_thread_idle;
unsigned cached_sq_dropped;
atomic_t cached_cq_overflow;
- struct io_uring_sqe *sq_sqes;
+ unsigned long sq_check_overflow;
struct list_head defer_list;
struct list_head timeout_list;
struct list_head cq_overflow_list;
wait_queue_head_t inflight_wait;
+ struct io_uring_sqe *sq_sqes;
} ____cacheline_aligned_in_smp;
struct io_rings *rings;
* readers must ensure that ->refs is alive as long as the file* is
* used. Only updated through io_uring_register(2).
*/
- struct fixed_file_table *file_table;
+ struct fixed_file_data *file_data;
unsigned nr_user_files;
+ int ring_fd;
+ struct file *ring_file;
/* if used, fixed mapped user buffers */
unsigned nr_user_bufs;
struct socket *ring_sock;
#endif
+ struct idr personality_idr;
+
struct {
unsigned cached_cq_tail;
unsigned cq_entries;
unsigned cq_mask;
atomic_t cq_timeouts;
+ unsigned long cq_check_overflow;
struct wait_queue_head cq_wait;
struct fasync_struct *cq_fasync;
struct eventfd_ctx *cq_ev_fd;
struct {
spinlock_t completion_lock;
- bool poll_multi_file;
+ struct llist_head poll_llist;
+
/*
* ->poll_list is protected by the ctx->uring_lock for
* io_uring instances that don't use IORING_SETUP_SQPOLL.
struct list_head poll_list;
struct hlist_head *cancel_hash;
unsigned cancel_hash_bits;
+ bool poll_multi_file;
spinlock_t inflight_lock;
struct list_head inflight_list;
struct wait_queue_entry wait;
};
+struct io_close {
+ struct file *file;
+ struct file *put_file;
+ int fd;
+};
+
struct io_timeout_data {
struct io_kiocb *req;
struct hrtimer timer;
loff_t len;
loff_t off;
int flags;
+ int mode;
};
struct io_cancel {
struct io_sr_msg {
struct file *file;
- struct user_msghdr __user *msg;
+ union {
+ struct user_msghdr __user *msg;
+ void __user *buf;
+ };
int msg_flags;
+ size_t len;
+};
+
+struct io_open {
+ struct file *file;
+ int dfd;
+ union {
+ unsigned mask;
+ };
+ struct filename *filename;
+ struct statx __user *buffer;
+ struct open_how how;
+};
+
+struct io_files_update {
+ struct file *file;
+ u64 arg;
+ u32 nr_args;
+ u32 offset;
+};
+
+struct io_fadvise {
+ struct file *file;
+ u64 offset;
+ u32 len;
+ u32 advice;
+};
+
+struct io_madvise {
+ struct file *file;
+ u64 addr;
+ u32 len;
+ u32 advice;
+};
+
+struct io_epoll {
+ struct file *file;
+ int epfd;
+ int op;
+ int fd;
+ struct epoll_event event;
};
struct io_async_connect {
ssize_t size;
};
+struct io_async_open {
+ struct filename *filename;
+};
+
struct io_async_ctx {
union {
struct io_async_rw rw;
struct io_async_msghdr msg;
struct io_async_connect connect;
struct io_timeout_data timeout;
+ struct io_async_open open;
};
};
+enum {
+ REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT,
+ REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT,
+ REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT,
+ REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT,
+ REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT,
+
+ REQ_F_LINK_NEXT_BIT,
+ REQ_F_FAIL_LINK_BIT,
+ REQ_F_INFLIGHT_BIT,
+ REQ_F_CUR_POS_BIT,
+ REQ_F_NOWAIT_BIT,
+ REQ_F_IOPOLL_COMPLETED_BIT,
+ REQ_F_LINK_TIMEOUT_BIT,
+ REQ_F_TIMEOUT_BIT,
+ REQ_F_ISREG_BIT,
+ REQ_F_MUST_PUNT_BIT,
+ REQ_F_TIMEOUT_NOSEQ_BIT,
+ REQ_F_COMP_LOCKED_BIT,
+};
+
+enum {
+ /* ctx owns file */
+ REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT),
+ /* drain existing IO first */
+ REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT),
+ /* linked sqes */
+ REQ_F_LINK = BIT(REQ_F_LINK_BIT),
+ /* doesn't sever on completion < 0 */
+ REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT),
+ /* IOSQE_ASYNC */
+ REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT),
+
+ /* already grabbed next link */
+ REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT),
+ /* fail rest of links */
+ REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT),
+ /* on inflight list */
+ REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT),
+ /* read/write uses file position */
+ REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT),
+ /* must not punt to workers */
+ REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT),
+ /* polled IO has completed */
+ REQ_F_IOPOLL_COMPLETED = BIT(REQ_F_IOPOLL_COMPLETED_BIT),
+ /* has linked timeout */
+ REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT),
+ /* timeout request */
+ REQ_F_TIMEOUT = BIT(REQ_F_TIMEOUT_BIT),
+ /* regular file */
+ REQ_F_ISREG = BIT(REQ_F_ISREG_BIT),
+ /* must be punted even for NONBLOCK */
+ REQ_F_MUST_PUNT = BIT(REQ_F_MUST_PUNT_BIT),
+ /* no timeout sequence */
+ REQ_F_TIMEOUT_NOSEQ = BIT(REQ_F_TIMEOUT_NOSEQ_BIT),
+ /* completion under lock */
+ REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT),
+};
+
/*
* NOTE! Each of the iocb union members has the file pointer
* as the first entry in their struct definition. So you can
struct io_timeout timeout;
struct io_connect connect;
struct io_sr_msg sr_msg;
+ struct io_open open;
+ struct io_close close;
+ struct io_files_update files_update;
+ struct io_fadvise fadvise;
+ struct io_madvise madvise;
+ struct io_epoll epoll;
};
struct io_async_ctx *io;
- struct file *ring_file;
- int ring_fd;
+ /*
+ * llist_node is only used for poll deferred completions
+ */
+ struct llist_node llist_node;
bool has_user;
bool in_async;
bool needs_fixed_file;
struct list_head link_list;
unsigned int flags;
refcount_t refs;
-#define REQ_F_NOWAIT 1 /* must not punt to workers */
-#define REQ_F_IOPOLL_COMPLETED 2 /* polled IO has completed */
-#define REQ_F_FIXED_FILE 4 /* ctx owns file */
-#define REQ_F_LINK_NEXT 8 /* already grabbed next link */
-#define REQ_F_IO_DRAIN 16 /* drain existing IO first */
-#define REQ_F_IO_DRAINED 32 /* drain done */
-#define REQ_F_LINK 64 /* linked sqes */
-#define REQ_F_LINK_TIMEOUT 128 /* has linked timeout */
-#define REQ_F_FAIL_LINK 256 /* fail rest of links */
-#define REQ_F_DRAIN_LINK 512 /* link should be fully drained */
-#define REQ_F_TIMEOUT 1024 /* timeout request */
-#define REQ_F_ISREG 2048 /* regular file */
-#define REQ_F_MUST_PUNT 4096 /* must be punted even for NONBLOCK */
-#define REQ_F_TIMEOUT_NOSEQ 8192 /* no timeout sequence */
-#define REQ_F_INFLIGHT 16384 /* on inflight list */
-#define REQ_F_COMP_LOCKED 32768 /* completion under lock */
-#define REQ_F_HARDLINK 65536 /* doesn't sever on completion < 0 */
u64 user_data;
u32 result;
u32 sequence;
unsigned int ios_left;
};
+struct io_op_def {
+ /* needs req->io allocated for deferral/async */
+ unsigned async_ctx : 1;
+ /* needs current->mm setup, does mm access */
+ unsigned needs_mm : 1;
+ /* needs req->file assigned */
+ unsigned needs_file : 1;
+ /* needs req->file assigned IFF fd is >= 0 */
+ unsigned fd_non_neg : 1;
+ /* hash wq insertion if file is a regular file */
+ unsigned hash_reg_file : 1;
+ /* unbound wq insertion if file is a non-regular file */
+ unsigned unbound_nonreg_file : 1;
+ /* opcode is not supported by this kernel */
+ unsigned not_supported : 1;
+ /* needs file table */
+ unsigned file_table : 1;
+};
+
+static const struct io_op_def io_op_defs[] = {
+ [IORING_OP_NOP] = {},
+ [IORING_OP_READV] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_WRITEV] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ .needs_file = 1,
+ .hash_reg_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_FSYNC] = {
+ .needs_file = 1,
+ },
+ [IORING_OP_READ_FIXED] = {
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_WRITE_FIXED] = {
+ .needs_file = 1,
+ .hash_reg_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_POLL_ADD] = {
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_POLL_REMOVE] = {},
+ [IORING_OP_SYNC_FILE_RANGE] = {
+ .needs_file = 1,
+ },
+ [IORING_OP_SENDMSG] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_RECVMSG] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_TIMEOUT] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ },
+ [IORING_OP_TIMEOUT_REMOVE] = {},
+ [IORING_OP_ACCEPT] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ .file_table = 1,
+ },
+ [IORING_OP_ASYNC_CANCEL] = {},
+ [IORING_OP_LINK_TIMEOUT] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ },
+ [IORING_OP_CONNECT] = {
+ .async_ctx = 1,
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_FALLOCATE] = {
+ .needs_file = 1,
+ },
+ [IORING_OP_OPENAT] = {
+ .needs_file = 1,
+ .fd_non_neg = 1,
+ .file_table = 1,
+ },
+ [IORING_OP_CLOSE] = {
+ .needs_file = 1,
+ .file_table = 1,
+ },
+ [IORING_OP_FILES_UPDATE] = {
+ .needs_mm = 1,
+ .file_table = 1,
+ },
+ [IORING_OP_STATX] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .fd_non_neg = 1,
+ },
+ [IORING_OP_READ] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_WRITE] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_FADVISE] = {
+ .needs_file = 1,
+ },
+ [IORING_OP_MADVISE] = {
+ .needs_mm = 1,
+ },
+ [IORING_OP_SEND] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_RECV] = {
+ .needs_mm = 1,
+ .needs_file = 1,
+ .unbound_nonreg_file = 1,
+ },
+ [IORING_OP_OPENAT2] = {
+ .needs_file = 1,
+ .fd_non_neg = 1,
+ .file_table = 1,
+ },
+ [IORING_OP_EPOLL_CTL] = {
+ .unbound_nonreg_file = 1,
+ .file_table = 1,
+ },
+};
+
static void io_wq_submit_work(struct io_wq_work **workptr);
static void io_cqring_fill_event(struct io_kiocb *req, long res);
-static void __io_free_req(struct io_kiocb *req);
static void io_put_req(struct io_kiocb *req);
-static void io_double_put_req(struct io_kiocb *req);
static void __io_double_put_req(struct io_kiocb *req);
static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req);
static void io_queue_linked_timeout(struct io_kiocb *req);
+static int __io_sqe_files_update(struct io_ring_ctx *ctx,
+ struct io_uring_files_update *ip,
+ unsigned nr_args);
+static int io_grab_files(struct io_kiocb *req);
static struct kmem_cache *req_cachep;
INIT_LIST_HEAD(&ctx->cq_overflow_list);
init_completion(&ctx->completions[0]);
init_completion(&ctx->completions[1]);
+ idr_init(&ctx->personality_idr);
mutex_init(&ctx->uring_lock);
init_waitqueue_head(&ctx->wait);
spin_lock_init(&ctx->completion_lock);
+ init_llist_head(&ctx->poll_llist);
INIT_LIST_HEAD(&ctx->poll_list);
INIT_LIST_HEAD(&ctx->defer_list);
INIT_LIST_HEAD(&ctx->timeout_list);
static inline bool req_need_defer(struct io_kiocb *req)
{
- if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) == REQ_F_IO_DRAIN)
+ if (unlikely(req->flags & REQ_F_IO_DRAIN))
return __req_need_defer(req);
return false;
{
struct io_rings *rings = ctx->rings;
- if (ctx->cached_cq_tail != READ_ONCE(rings->cq.tail)) {
- /* order cqe stores with ring update */
- smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
+ /* order cqe stores with ring update */
+ smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
- if (wq_has_sleeper(&ctx->cq_wait)) {
- wake_up_interruptible(&ctx->cq_wait);
- kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
- }
+ if (wq_has_sleeper(&ctx->cq_wait)) {
+ wake_up_interruptible(&ctx->cq_wait);
+ kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
+ }
+}
+
+static inline void io_req_work_grab_env(struct io_kiocb *req,
+ const struct io_op_def *def)
+{
+ if (!req->work.mm && def->needs_mm) {
+ mmgrab(current->mm);
+ req->work.mm = current->mm;
}
+ if (!req->work.creds)
+ req->work.creds = get_current_cred();
}
-static inline bool io_req_needs_user(struct io_kiocb *req)
+static inline void io_req_work_drop_env(struct io_kiocb *req)
{
- return !(req->opcode == IORING_OP_READ_FIXED ||
- req->opcode == IORING_OP_WRITE_FIXED);
+ if (req->work.mm) {
+ mmdrop(req->work.mm);
+ req->work.mm = NULL;
+ }
+ if (req->work.creds) {
+ put_cred(req->work.creds);
+ req->work.creds = NULL;
+ }
}
static inline bool io_prep_async_work(struct io_kiocb *req,
struct io_kiocb **link)
{
+ const struct io_op_def *def = &io_op_defs[req->opcode];
bool do_hashed = false;
- switch (req->opcode) {
- case IORING_OP_WRITEV:
- case IORING_OP_WRITE_FIXED:
- /* only regular files should be hashed for writes */
- if (req->flags & REQ_F_ISREG)
+ if (req->flags & REQ_F_ISREG) {
+ if (def->hash_reg_file)
do_hashed = true;
- /* fall-through */
- case IORING_OP_READV:
- case IORING_OP_READ_FIXED:
- case IORING_OP_SENDMSG:
- case IORING_OP_RECVMSG:
- case IORING_OP_ACCEPT:
- case IORING_OP_POLL_ADD:
- case IORING_OP_CONNECT:
- /*
- * We know REQ_F_ISREG is not set on some of these
- * opcodes, but this enables us to keep the check in
- * just one place.
- */
- if (!(req->flags & REQ_F_ISREG))
+ } else {
+ if (def->unbound_nonreg_file)
req->work.flags |= IO_WQ_WORK_UNBOUND;
- break;
}
- if (io_req_needs_user(req))
- req->work.flags |= IO_WQ_WORK_NEEDS_USER;
+
+ io_req_work_grab_env(req, def);
*link = io_prep_linked_timeout(req);
return do_hashed;
__io_commit_cqring(ctx);
- while ((req = io_get_deferred_req(ctx)) != NULL) {
- req->flags |= REQ_F_IO_DRAINED;
+ while ((req = io_get_deferred_req(ctx)) != NULL)
io_queue_async_work(req);
- }
}
static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx)
return &rings->cqes[tail & ctx->cq_mask];
}
+static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx)
+{
+ if (!ctx->eventfd_async)
+ return true;
+ return io_wq_current_is_worker() || in_interrupt();
+}
+
static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
{
if (waitqueue_active(&ctx->wait))
wake_up(&ctx->wait);
if (waitqueue_active(&ctx->sqo_wait))
wake_up(&ctx->sqo_wait);
- if (ctx->cq_ev_fd)
+ if (ctx->cq_ev_fd && io_should_trigger_evfd(ctx))
eventfd_signal(ctx->cq_ev_fd, 1);
}
/* if force is set, the ring is going away. always drop after that */
if (force)
- ctx->cq_overflow_flushed = true;
+ ctx->cq_overflow_flushed = 1;
cqe = NULL;
while (!list_empty(&ctx->cq_overflow_list)) {
}
io_commit_cqring(ctx);
+ if (cqe) {
+ clear_bit(0, &ctx->sq_check_overflow);
+ clear_bit(0, &ctx->cq_check_overflow);
+ }
spin_unlock_irqrestore(&ctx->completion_lock, flags);
io_cqring_ev_posted(ctx);
WRITE_ONCE(ctx->rings->cq_overflow,
atomic_inc_return(&ctx->cached_cq_overflow));
} else {
+ if (list_empty(&ctx->cq_overflow_list)) {
+ set_bit(0, &ctx->sq_check_overflow);
+ set_bit(0, &ctx->cq_check_overflow);
+ }
refcount_inc(&req->refs);
req->result = res;
list_add_tail(&req->list, &ctx->cq_overflow_list);
gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
struct io_kiocb *req;
- if (!percpu_ref_tryget(&ctx->refs))
- return NULL;
-
if (!state) {
req = kmem_cache_alloc(req_cachep, gfp);
if (unlikely(!req))
got_it:
req->io = NULL;
- req->ring_file = NULL;
req->file = NULL;
req->ctx = ctx;
req->flags = 0;
return NULL;
}
-static void io_free_req_many(struct io_ring_ctx *ctx, void **reqs, int *nr)
+static void __io_req_do_free(struct io_kiocb *req)
{
- if (*nr) {
- kmem_cache_free_bulk(req_cachep, *nr, reqs);
- percpu_ref_put_many(&ctx->refs, *nr);
- *nr = 0;
+ if (likely(!io_is_fallback_req(req)))
+ kmem_cache_free(req_cachep, req);
+ else
+ clear_bit_unlock(0, (unsigned long *) req->ctx->fallback_req);
+}
+
+static void __io_req_aux_free(struct io_kiocb *req)
+{
+ struct io_ring_ctx *ctx = req->ctx;
+
+ kfree(req->io);
+ if (req->file) {
+ if (req->flags & REQ_F_FIXED_FILE)
+ percpu_ref_put(&ctx->file_data->refs);
+ else
+ fput(req->file);
}
+
+ io_req_work_drop_env(req);
}
static void __io_free_req(struct io_kiocb *req)
{
- struct io_ring_ctx *ctx = req->ctx;
+ __io_req_aux_free(req);
- if (req->io)
- kfree(req->io);
- if (req->file && !(req->flags & REQ_F_FIXED_FILE))
- fput(req->file);
if (req->flags & REQ_F_INFLIGHT) {
+ struct io_ring_ctx *ctx = req->ctx;
unsigned long flags;
spin_lock_irqsave(&ctx->inflight_lock, flags);
wake_up(&ctx->inflight_wait);
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
}
- percpu_ref_put(&ctx->refs);
- if (likely(!io_is_fallback_req(req)))
- kmem_cache_free(req_cachep, req);
- else
- clear_bit_unlock(0, (unsigned long *) ctx->fallback_req);
+
+ percpu_ref_put(&req->ctx->refs);
+ __io_req_do_free(req);
+}
+
+struct req_batch {
+ void *reqs[IO_IOPOLL_BATCH];
+ int to_free;
+ int need_iter;
+};
+
+static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb)
+{
+ int fixed_refs = rb->to_free;
+
+ if (!rb->to_free)
+ return;
+ if (rb->need_iter) {
+ int i, inflight = 0;
+ unsigned long flags;
+
+ fixed_refs = 0;
+ for (i = 0; i < rb->to_free; i++) {
+ struct io_kiocb *req = rb->reqs[i];
+
+ if (req->flags & REQ_F_FIXED_FILE) {
+ req->file = NULL;
+ fixed_refs++;
+ }
+ if (req->flags & REQ_F_INFLIGHT)
+ inflight++;
+ __io_req_aux_free(req);
+ }
+ if (!inflight)
+ goto do_free;
+
+ spin_lock_irqsave(&ctx->inflight_lock, flags);
+ for (i = 0; i < rb->to_free; i++) {
+ struct io_kiocb *req = rb->reqs[i];
+
+ if (req->flags & REQ_F_INFLIGHT) {
+ list_del(&req->inflight_entry);
+ if (!--inflight)
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&ctx->inflight_lock, flags);
+
+ if (waitqueue_active(&ctx->inflight_wait))
+ wake_up(&ctx->inflight_wait);
+ }
+do_free:
+ kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs);
+ if (fixed_refs)
+ percpu_ref_put_many(&ctx->file_data->refs, fixed_refs);
+ percpu_ref_put_many(&ctx->refs, rb->to_free);
+ rb->to_free = rb->need_iter = 0;
}
static bool io_link_cancel_timeout(struct io_kiocb *req)
{
struct io_rings *rings = ctx->rings;
- /*
- * noflush == true is from the waitqueue handler, just ensure we wake
- * up the task, and the next invocation will flush the entries. We
- * cannot safely to it from here.
- */
- if (noflush && !list_empty(&ctx->cq_overflow_list))
- return -1U;
+ if (test_bit(0, &ctx->cq_check_overflow)) {
+ /*
+ * noflush == true is from the waitqueue handler, just ensure
+ * we wake up the task, and the next invocation will flush the
+ * entries. We cannot safely to it from here.
+ */
+ if (noflush && !list_empty(&ctx->cq_overflow_list))
+ return -1U;
- io_cqring_overflow_flush(ctx, false);
+ io_cqring_overflow_flush(ctx, false);
+ }
/* See comment at the top of this file */
smp_rmb();
- return READ_ONCE(rings->cq.tail) - READ_ONCE(rings->cq.head);
+ return ctx->cached_cq_tail - READ_ONCE(rings->cq.head);
}
static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
}
+static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req)
+{
+ if ((req->flags & REQ_F_LINK) || io_is_fallback_req(req))
+ return false;
+
+ if (!(req->flags & REQ_F_FIXED_FILE) || req->io)
+ rb->need_iter++;
+
+ rb->reqs[rb->to_free++] = req;
+ if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs)))
+ io_free_req_many(req->ctx, rb);
+ return true;
+}
+
/*
* Find and free completed poll iocbs
*/
static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
struct list_head *done)
{
- void *reqs[IO_IOPOLL_BATCH];
+ struct req_batch rb;
struct io_kiocb *req;
- int to_free;
- to_free = 0;
+ rb.to_free = rb.need_iter = 0;
while (!list_empty(done)) {
req = list_first_entry(done, struct io_kiocb, list);
list_del(&req->list);
io_cqring_fill_event(req, req->result);
(*nr_events)++;
- if (refcount_dec_and_test(&req->refs)) {
- /* If we're not using fixed files, we have to pair the
- * completion part with the file put. Use regular
- * completions for those, only batch free for fixed
- * file and non-linked commands.
- */
- if (((req->flags & (REQ_F_FIXED_FILE|REQ_F_LINK)) ==
- REQ_F_FIXED_FILE) && !io_is_fallback_req(req) &&
- !req->io) {
- reqs[to_free++] = req;
- if (to_free == ARRAY_SIZE(reqs))
- io_free_req_many(ctx, reqs, &to_free);
- } else {
- io_free_req(req);
- }
- }
+ if (refcount_dec_and_test(&req->refs) &&
+ !io_req_multi_free(&rb, req))
+ io_free_req(req);
}
io_commit_cqring(ctx);
- io_free_req_many(ctx, reqs, &to_free);
+ io_free_req_many(ctx, &rb);
}
static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
req->flags |= REQ_F_ISREG;
kiocb->ki_pos = READ_ONCE(sqe->off);
+ if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) {
+ req->flags |= REQ_F_CUR_POS;
+ kiocb->ki_pos = req->file->f_pos;
+ }
kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
static void kiocb_done(struct kiocb *kiocb, ssize_t ret, struct io_kiocb **nxt,
bool in_async)
{
+ struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
+
+ if (req->flags & REQ_F_CUR_POS)
+ req->file->f_pos = kiocb->ki_pos;
if (in_async && ret >= 0 && kiocb->ki_complete == io_complete_rw)
*nxt = __io_complete_rw(kiocb, ret);
else
if (req->rw.kiocb.private)
return -EINVAL;
+ if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) {
+ ssize_t ret;
+ ret = import_single_range(rw, buf, sqe_len, *iovec, iter);
+ *iovec = NULL;
+ return ret;
+ }
+
if (req->io) {
struct io_async_rw *iorw = &req->io->rw;
static int io_alloc_async_ctx(struct io_kiocb *req)
{
+ if (!io_op_defs[req->opcode].async_ctx)
+ return 0;
req->io = kmalloc(sizeof(*req->io), GFP_KERNEL);
return req->io == NULL;
}
struct iovec *iovec, struct iovec *fast_iov,
struct iov_iter *iter)
{
- if (req->opcode == IORING_OP_READ_FIXED ||
- req->opcode == IORING_OP_WRITE_FIXED)
+ if (!io_op_defs[req->opcode].async_ctx)
return 0;
if (!req->io && io_alloc_async_ctx(req))
return -ENOMEM;
return 0;
}
-static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
- struct io_ring_ctx *ctx = req->ctx;
-
- if (!req->file)
- return -EBADF;
-
- if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
- return -EINVAL;
- if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index))
- return -EINVAL;
-
- req->sync.off = READ_ONCE(sqe->off);
- req->sync.len = READ_ONCE(sqe->len);
- req->sync.flags = READ_ONCE(sqe->sync_range_flags);
- return 0;
-}
-
-static void io_sync_file_range_finish(struct io_wq_work **workptr)
+static void io_fallocate_finish(struct io_wq_work **workptr)
{
struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
struct io_kiocb *nxt = NULL;
int ret;
- if (io_req_cancelled(req))
- return;
-
- ret = sync_file_range(req->file, req->sync.off, req->sync.len,
- req->sync.flags);
+ ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off,
+ req->sync.len);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_wq_assign_next(workptr, nxt);
}
-static int io_sync_file_range(struct io_kiocb *req, struct io_kiocb **nxt,
- bool force_nonblock)
+static int io_fallocate_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ if (sqe->ioprio || sqe->buf_index || sqe->rw_flags)
+ return -EINVAL;
+
+ req->sync.off = READ_ONCE(sqe->off);
+ req->sync.len = READ_ONCE(sqe->addr);
+ req->sync.mode = READ_ONCE(sqe->len);
+ return 0;
+}
+
+static int io_fallocate(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
{
struct io_wq_work *work, *old_work;
- /* sync_file_range always requires a blocking context */
+ /* fallocate always requiring blocking context */
if (force_nonblock) {
io_put_req(req);
- req->work.func = io_sync_file_range_finish;
+ req->work.func = io_fallocate_finish;
return -EAGAIN;
}
work = old_work = &req->work;
- io_sync_file_range_finish(&work);
+ io_fallocate_finish(&work);
if (work && work != old_work)
*nxt = container_of(work, struct io_kiocb, work);
+
return 0;
}
-#if defined(CONFIG_NET)
-static void io_sendrecv_async(struct io_wq_work **workptr)
+static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
- struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
- struct iovec *iov = NULL;
-
- if (req->io->rw.iov != req->io->rw.fast_iov)
- iov = req->io->msg.iov;
- io_wq_submit_work(workptr);
- kfree(iov);
-}
-#endif
+ const char __user *fname;
+ int ret;
-static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-#if defined(CONFIG_NET)
- struct io_sr_msg *sr = &req->sr_msg;
- struct io_async_ctx *io = req->io;
+ if (sqe->ioprio || sqe->buf_index)
+ return -EINVAL;
- sr->msg_flags = READ_ONCE(sqe->msg_flags);
- sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ req->open.dfd = READ_ONCE(sqe->fd);
+ req->open.how.mode = READ_ONCE(sqe->len);
+ fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ req->open.how.flags = READ_ONCE(sqe->open_flags);
- if (!io)
- return 0;
+ req->open.filename = getname(fname);
+ if (IS_ERR(req->open.filename)) {
+ ret = PTR_ERR(req->open.filename);
+ req->open.filename = NULL;
+ return ret;
+ }
- io->msg.iov = io->msg.fast_iov;
- return sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags,
- &io->msg.iov);
-#else
- return -EOPNOTSUPP;
-#endif
+ return 0;
}
-static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt,
- bool force_nonblock)
+static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
-#if defined(CONFIG_NET)
- struct io_async_msghdr *kmsg = NULL;
- struct socket *sock;
+ struct open_how __user *how;
+ const char __user *fname;
+ size_t len;
int ret;
- if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
- sock = sock_from_file(req->file, &ret);
- if (sock) {
- struct io_async_ctx io;
- struct sockaddr_storage addr;
- unsigned flags;
+ req->open.dfd = READ_ONCE(sqe->fd);
+ fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ how = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ len = READ_ONCE(sqe->len);
- if (req->io) {
- kmsg = &req->io->msg;
- kmsg->msg.msg_name = &addr;
- /* if iov is set, it's allocated already */
- if (!kmsg->iov)
- kmsg->iov = kmsg->fast_iov;
- kmsg->msg.msg_iter.iov = kmsg->iov;
- } else {
- struct io_sr_msg *sr = &req->sr_msg;
+ if (len < OPEN_HOW_SIZE_VER0)
+ return -EINVAL;
- kmsg = &io.msg;
- kmsg->msg.msg_name = &addr;
+ ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how,
+ len);
+ if (ret)
+ return ret;
- io.msg.iov = io.msg.fast_iov;
- ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg,
- sr->msg_flags, &io.msg.iov);
- if (ret)
- return ret;
- }
+ if (!(req->open.how.flags & O_PATH) && force_o_largefile())
+ req->open.how.flags |= O_LARGEFILE;
- flags = req->sr_msg.msg_flags;
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
- flags |= MSG_DONTWAIT;
+ req->open.filename = getname(fname);
+ if (IS_ERR(req->open.filename)) {
+ ret = PTR_ERR(req->open.filename);
+ req->open.filename = NULL;
+ return ret;
+ }
+
+ return 0;
+}
+
+static int io_openat2(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct open_flags op;
+ struct file *file;
+ int ret;
+
+ if (force_nonblock)
+ return -EAGAIN;
+
+ ret = build_open_flags(&req->open.how, &op);
+ if (ret)
+ goto err;
+
+ ret = get_unused_fd_flags(req->open.how.flags);
+ if (ret < 0)
+ goto err;
+
+ file = do_filp_open(req->open.dfd, req->open.filename, &op);
+ if (IS_ERR(file)) {
+ put_unused_fd(ret);
+ ret = PTR_ERR(file);
+ } else {
+ fsnotify_open(file);
+ fd_install(ret, file);
+ }
+err:
+ putname(req->open.filename);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, nxt);
+ return 0;
+}
+
+static int io_openat(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ req->open.how = build_open_how(req->open.how.flags, req->open.how.mode);
+ return io_openat2(req, nxt, force_nonblock);
+}
+
+static int io_epoll_ctl_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+#if defined(CONFIG_EPOLL)
+ if (sqe->ioprio || sqe->buf_index)
+ return -EINVAL;
+
+ req->epoll.epfd = READ_ONCE(sqe->fd);
+ req->epoll.op = READ_ONCE(sqe->len);
+ req->epoll.fd = READ_ONCE(sqe->off);
+
+ if (ep_op_has_event(req->epoll.op)) {
+ struct epoll_event __user *ev;
+
+ ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ if (copy_from_user(&req->epoll.event, ev, sizeof(*ev)))
+ return -EFAULT;
+ }
+
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_epoll_ctl(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_EPOLL)
+ struct io_epoll *ie = &req->epoll;
+ int ret;
+
+ ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
+ if (force_nonblock && ret == -EAGAIN)
+ return -EAGAIN;
+
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, nxt);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
+ if (sqe->ioprio || sqe->buf_index || sqe->off)
+ return -EINVAL;
+
+ req->madvise.addr = READ_ONCE(sqe->addr);
+ req->madvise.len = READ_ONCE(sqe->len);
+ req->madvise.advice = READ_ONCE(sqe->fadvise_advice);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_madvise(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
+ struct io_madvise *ma = &req->madvise;
+ int ret;
+
+ if (force_nonblock)
+ return -EAGAIN;
+
+ ret = do_madvise(ma->addr, ma->len, ma->advice);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, nxt);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ if (sqe->ioprio || sqe->buf_index || sqe->addr)
+ return -EINVAL;
+
+ req->fadvise.offset = READ_ONCE(sqe->off);
+ req->fadvise.len = READ_ONCE(sqe->len);
+ req->fadvise.advice = READ_ONCE(sqe->fadvise_advice);
+ return 0;
+}
+
+static int io_fadvise(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct io_fadvise *fa = &req->fadvise;
+ int ret;
+
+ /* DONTNEED may block, others _should_ not */
+ if (fa->advice == POSIX_FADV_DONTNEED && force_nonblock)
+ return -EAGAIN;
+
+ ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, nxt);
+ return 0;
+}
+
+static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ const char __user *fname;
+ unsigned lookup_flags;
+ int ret;
+
+ if (sqe->ioprio || sqe->buf_index)
+ return -EINVAL;
+
+ req->open.dfd = READ_ONCE(sqe->fd);
+ req->open.mask = READ_ONCE(sqe->len);
+ fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ req->open.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ req->open.how.flags = READ_ONCE(sqe->statx_flags);
+
+ if (vfs_stat_set_lookup_flags(&lookup_flags, req->open.how.flags))
+ return -EINVAL;
+
+ req->open.filename = getname_flags(fname, lookup_flags, NULL);
+ if (IS_ERR(req->open.filename)) {
+ ret = PTR_ERR(req->open.filename);
+ req->open.filename = NULL;
+ return ret;
+ }
+
+ return 0;
+}
+
+static int io_statx(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct io_open *ctx = &req->open;
+ unsigned lookup_flags;
+ struct path path;
+ struct kstat stat;
+ int ret;
+
+ if (force_nonblock)
+ return -EAGAIN;
+
+ if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->how.flags))
+ return -EINVAL;
+
+retry:
+ /* filename_lookup() drops it, keep a reference */
+ ctx->filename->refcnt++;
+
+ ret = filename_lookup(ctx->dfd, ctx->filename, lookup_flags, &path,
+ NULL);
+ if (ret)
+ goto err;
+
+ ret = vfs_getattr(&path, &stat, ctx->mask, ctx->how.flags);
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+ if (!ret)
+ ret = cp_statx(&stat, ctx->buffer);
+err:
+ putname(ctx->filename);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, nxt);
+ return 0;
+}
+
+static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ /*
+ * If we queue this for async, it must not be cancellable. That would
+ * leave the 'file' in an undeterminate state.
+ */
+ req->work.flags |= IO_WQ_WORK_NO_CANCEL;
+
+ if (sqe->ioprio || sqe->off || sqe->addr || sqe->len ||
+ sqe->rw_flags || sqe->buf_index)
+ return -EINVAL;
+ if (sqe->flags & IOSQE_FIXED_FILE)
+ return -EINVAL;
+
+ req->close.fd = READ_ONCE(sqe->fd);
+ if (req->file->f_op == &io_uring_fops ||
+ req->close.fd == req->ctx->ring_fd)
+ return -EBADF;
+
+ return 0;
+}
+
+static void io_close_finish(struct io_wq_work **workptr)
+{
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ struct io_kiocb *nxt = NULL;
+
+ /* Invoked with files, we need to do the close */
+ if (req->work.files) {
+ int ret;
+
+ ret = filp_close(req->close.put_file, req->work.files);
+ if (ret < 0) {
+ req_set_fail_links(req);
+ }
+ io_cqring_add_event(req, ret);
+ }
+
+ fput(req->close.put_file);
+
+ /* we bypassed the re-issue, drop the submission reference */
+ io_put_req(req);
+ io_put_req_find_next(req, &nxt);
+ if (nxt)
+ io_wq_assign_next(workptr, nxt);
+}
+
+static int io_close(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ int ret;
+
+ req->close.put_file = NULL;
+ ret = __close_fd_get_file(req->close.fd, &req->close.put_file);
+ if (ret < 0)
+ return ret;
+
+ /* if the file has a flush method, be safe and punt to async */
+ if (req->close.put_file->f_op->flush && !io_wq_current_is_worker())
+ goto eagain;
+
+ /*
+ * No ->flush(), safely close from here and just punt the
+ * fput() to async context.
+ */
+ ret = filp_close(req->close.put_file, current->files);
+
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+
+ if (io_wq_current_is_worker()) {
+ struct io_wq_work *old_work, *work;
+
+ old_work = work = &req->work;
+ io_close_finish(&work);
+ if (work && work != old_work)
+ *nxt = container_of(work, struct io_kiocb, work);
+ return 0;
+ }
+
+eagain:
+ req->work.func = io_close_finish;
+ return -EAGAIN;
+}
+
+static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_ring_ctx *ctx = req->ctx;
+
+ if (!req->file)
+ return -EBADF;
+
+ if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index))
+ return -EINVAL;
+
+ req->sync.off = READ_ONCE(sqe->off);
+ req->sync.len = READ_ONCE(sqe->len);
+ req->sync.flags = READ_ONCE(sqe->sync_range_flags);
+ return 0;
+}
+
+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;
+ int ret;
+
+ if (io_req_cancelled(req))
+ return;
+
+ ret = sync_file_range(req->file, req->sync.off, req->sync.len,
+ req->sync.flags);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req_find_next(req, &nxt);
+ if (nxt)
+ io_wq_assign_next(workptr, nxt);
+}
+
+static int io_sync_file_range(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct io_wq_work *work, *old_work;
+
+ /* sync_file_range always requires a blocking context */
+ if (force_nonblock) {
+ io_put_req(req);
+ req->work.func = io_sync_file_range_finish;
+ return -EAGAIN;
+ }
+
+ work = old_work = &req->work;
+ io_sync_file_range_finish(&work);
+ if (work && work != old_work)
+ *nxt = container_of(work, struct io_kiocb, work);
+ return 0;
+}
+
+#if defined(CONFIG_NET)
+static void io_sendrecv_async(struct io_wq_work **workptr)
+{
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ struct iovec *iov = NULL;
+
+ if (req->io->rw.iov != req->io->rw.fast_iov)
+ iov = req->io->msg.iov;
+ io_wq_submit_work(workptr);
+ kfree(iov);
+}
+#endif
+
+static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+#if defined(CONFIG_NET)
+ struct io_sr_msg *sr = &req->sr_msg;
+ struct io_async_ctx *io = req->io;
+
+ sr->msg_flags = READ_ONCE(sqe->msg_flags);
+ sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ sr->len = READ_ONCE(sqe->len);
+
+ if (!io || req->opcode == IORING_OP_SEND)
+ return 0;
+
+ io->msg.iov = io->msg.fast_iov;
+ return sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags,
+ &io->msg.iov);
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_NET)
+ struct io_async_msghdr *kmsg = NULL;
+ struct socket *sock;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+
+ sock = sock_from_file(req->file, &ret);
+ if (sock) {
+ struct io_async_ctx io;
+ struct sockaddr_storage addr;
+ unsigned flags;
+
+ if (req->io) {
+ kmsg = &req->io->msg;
+ kmsg->msg.msg_name = &addr;
+ /* if iov is set, it's allocated already */
+ if (!kmsg->iov)
+ kmsg->iov = kmsg->fast_iov;
+ kmsg->msg.msg_iter.iov = kmsg->iov;
+ } else {
+ struct io_sr_msg *sr = &req->sr_msg;
+
+ kmsg = &io.msg;
+ kmsg->msg.msg_name = &addr;
+
+ io.msg.iov = io.msg.fast_iov;
+ ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg,
+ sr->msg_flags, &io.msg.iov);
+ if (ret)
+ return ret;
+ }
+
+ flags = req->sr_msg.msg_flags;
+ if (flags & MSG_DONTWAIT)
+ req->flags |= REQ_F_NOWAIT;
+ else if (force_nonblock)
+ flags |= MSG_DONTWAIT;
ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
if (force_nonblock && ret == -EAGAIN) {
#endif
}
+static int io_send(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_NET)
+ struct socket *sock;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+
+ sock = sock_from_file(req->file, &ret);
+ if (sock) {
+ struct io_sr_msg *sr = &req->sr_msg;
+ struct msghdr msg;
+ struct iovec iov;
+ unsigned flags;
+
+ ret = import_single_range(WRITE, sr->buf, sr->len, &iov,
+ &msg.msg_iter);
+ if (ret)
+ return ret;
+
+ msg.msg_name = NULL;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_namelen = 0;
+
+ flags = req->sr_msg.msg_flags;
+ if (flags & MSG_DONTWAIT)
+ req->flags |= REQ_F_NOWAIT;
+ else if (force_nonblock)
+ flags |= MSG_DONTWAIT;
+
+ ret = __sys_sendmsg_sock(sock, &msg, flags);
+ if (force_nonblock && ret == -EAGAIN)
+ return -EAGAIN;
+ if (ret == -ERESTARTSYS)
+ ret = -EINTR;
+ }
+
+ io_cqring_add_event(req, ret);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_put_req_find_next(req, nxt);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
static int io_recvmsg_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
sr->msg_flags = READ_ONCE(sqe->msg_flags);
sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr));
- if (!io)
+ if (!io || req->opcode == IORING_OP_RECV)
return 0;
io->msg.iov = io->msg.fast_iov;
#endif
}
+static int io_recv(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_NET)
+ struct socket *sock;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+
+ sock = sock_from_file(req->file, &ret);
+ if (sock) {
+ struct io_sr_msg *sr = &req->sr_msg;
+ struct msghdr msg;
+ struct iovec iov;
+ unsigned flags;
+
+ ret = import_single_range(READ, sr->buf, sr->len, &iov,
+ &msg.msg_iter);
+ if (ret)
+ return ret;
+
+ msg.msg_name = NULL;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_namelen = 0;
+ msg.msg_iocb = NULL;
+ msg.msg_flags = 0;
+
+ flags = req->sr_msg.msg_flags;
+ if (flags & MSG_DONTWAIT)
+ req->flags |= REQ_F_NOWAIT;
+ else if (force_nonblock)
+ flags |= MSG_DONTWAIT;
+
+ ret = __sys_recvmsg_sock(sock, &msg, NULL, NULL, flags);
+ if (force_nonblock && ret == -EAGAIN)
+ return -EAGAIN;
+ if (ret == -ERESTARTSYS)
+ ret = -EINTR;
+ }
+
+ io_cqring_add_event(req, ret);
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_put_req_find_next(req, nxt);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+
static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
ret = __io_accept(req, nxt, force_nonblock);
if (ret == -EAGAIN && force_nonblock) {
req->work.func = io_accept_finish;
- req->work.flags |= IO_WQ_WORK_NEEDS_FILES;
io_put_req(req);
return -EAGAIN;
}
io_wq_assign_next(workptr, nxt);
}
+static void __io_poll_flush(struct io_ring_ctx *ctx, struct llist_node *nodes)
+{
+ struct io_kiocb *req, *tmp;
+ struct req_batch rb;
+
+ rb.to_free = rb.need_iter = 0;
+ spin_lock_irq(&ctx->completion_lock);
+ llist_for_each_entry_safe(req, tmp, nodes, llist_node) {
+ hash_del(&req->hash_node);
+ io_poll_complete(req, req->result, 0);
+
+ if (refcount_dec_and_test(&req->refs) &&
+ !io_req_multi_free(&rb, req)) {
+ req->flags |= REQ_F_COMP_LOCKED;
+ io_free_req(req);
+ }
+ }
+ spin_unlock_irq(&ctx->completion_lock);
+
+ io_cqring_ev_posted(ctx);
+ io_free_req_many(ctx, &rb);
+}
+
+static void io_poll_flush(struct io_wq_work **workptr)
+{
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ struct llist_node *nodes;
+
+ nodes = llist_del_all(&req->ctx->poll_llist);
+ if (nodes)
+ __io_poll_flush(req->ctx, nodes);
+}
+
static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
void *key)
{
struct io_kiocb *req = container_of(poll, struct io_kiocb, poll);
struct io_ring_ctx *ctx = req->ctx;
__poll_t mask = key_to_poll(key);
- unsigned long flags;
/* for instances that support it check for an event match first: */
if (mask && !(mask & poll->events))
* If we have a link timeout we're going to need the completion_lock
* for finalizing the request, mark us as having grabbed that already.
*/
- if (mask && spin_trylock_irqsave(&ctx->completion_lock, flags)) {
- hash_del(&req->hash_node);
- io_poll_complete(req, mask, 0);
- req->flags |= REQ_F_COMP_LOCKED;
- io_put_req(req);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
+ if (mask) {
+ unsigned long flags;
- io_cqring_ev_posted(ctx);
- } else {
- io_queue_async_work(req);
+ if (llist_empty(&ctx->poll_llist) &&
+ spin_trylock_irqsave(&ctx->completion_lock, flags)) {
+ hash_del(&req->hash_node);
+ io_poll_complete(req, mask, 0);
+ req->flags |= REQ_F_COMP_LOCKED;
+ io_put_req(req);
+ spin_unlock_irqrestore(&ctx->completion_lock, flags);
+
+ io_cqring_ev_posted(ctx);
+ req = NULL;
+ } else {
+ req->result = mask;
+ req->llist_node.next = NULL;
+ /* if the list wasn't empty, we're done */
+ if (!llist_add(&req->llist_node, &ctx->poll_llist))
+ req = NULL;
+ else
+ req->work.func = io_poll_flush;
+ }
}
+ if (req)
+ io_queue_async_work(req);
return 1;
}
return 0;
}
-static int io_async_cancel(struct io_kiocb *req, struct io_kiocb **nxt)
+static int io_async_cancel(struct io_kiocb *req, struct io_kiocb **nxt)
+{
+ struct io_ring_ctx *ctx = req->ctx;
+
+ io_async_find_and_cancel(ctx, req, req->cancel.addr, nxt, 0);
+ return 0;
+}
+
+static int io_files_update_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ if (sqe->flags || sqe->ioprio || sqe->rw_flags)
+ return -EINVAL;
+
+ req->files_update.offset = READ_ONCE(sqe->off);
+ req->files_update.nr_args = READ_ONCE(sqe->len);
+ if (!req->files_update.nr_args)
+ return -EINVAL;
+ req->files_update.arg = READ_ONCE(sqe->addr);
+ return 0;
+}
+
+static int io_files_update(struct io_kiocb *req, bool force_nonblock)
{
struct io_ring_ctx *ctx = req->ctx;
+ struct io_uring_files_update up;
+ int ret;
- io_async_find_and_cancel(ctx, req, req->cancel.addr, nxt, 0);
+ if (force_nonblock)
+ return -EAGAIN;
+
+ up.offset = req->files_update.offset;
+ up.fds = req->files_update.arg;
+
+ mutex_lock(&ctx->uring_lock);
+ ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args);
+ mutex_unlock(&ctx->uring_lock);
+
+ if (ret < 0)
+ req_set_fail_links(req);
+ io_cqring_add_event(req, ret);
+ io_put_req(req);
return 0;
}
{
ssize_t ret = 0;
+ if (io_op_defs[req->opcode].file_table) {
+ ret = io_grab_files(req);
+ if (unlikely(ret))
+ return ret;
+ }
+
+ io_req_work_grab_env(req, &io_op_defs[req->opcode]);
+
switch (req->opcode) {
case IORING_OP_NOP:
break;
case IORING_OP_READV:
case IORING_OP_READ_FIXED:
+ case IORING_OP_READ:
ret = io_read_prep(req, sqe, true);
break;
case IORING_OP_WRITEV:
case IORING_OP_WRITE_FIXED:
+ case IORING_OP_WRITE:
ret = io_write_prep(req, sqe, true);
break;
case IORING_OP_POLL_ADD:
ret = io_prep_sfr(req, sqe);
break;
case IORING_OP_SENDMSG:
+ case IORING_OP_SEND:
ret = io_sendmsg_prep(req, sqe);
break;
case IORING_OP_RECVMSG:
+ case IORING_OP_RECV:
ret = io_recvmsg_prep(req, sqe);
break;
case IORING_OP_CONNECT:
case IORING_OP_ACCEPT:
ret = io_accept_prep(req, sqe);
break;
+ case IORING_OP_FALLOCATE:
+ ret = io_fallocate_prep(req, sqe);
+ break;
+ case IORING_OP_OPENAT:
+ ret = io_openat_prep(req, sqe);
+ break;
+ case IORING_OP_CLOSE:
+ ret = io_close_prep(req, sqe);
+ break;
+ case IORING_OP_FILES_UPDATE:
+ ret = io_files_update_prep(req, sqe);
+ break;
+ case IORING_OP_STATX:
+ ret = io_statx_prep(req, sqe);
+ break;
+ case IORING_OP_FADVISE:
+ ret = io_fadvise_prep(req, sqe);
+ break;
+ case IORING_OP_MADVISE:
+ ret = io_madvise_prep(req, sqe);
+ break;
+ case IORING_OP_OPENAT2:
+ ret = io_openat2_prep(req, sqe);
+ break;
+ case IORING_OP_EPOLL_CTL:
+ ret = io_epoll_ctl_prep(req, sqe);
+ break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
break;
case IORING_OP_READV:
case IORING_OP_READ_FIXED:
+ case IORING_OP_READ:
if (sqe) {
ret = io_read_prep(req, sqe, force_nonblock);
if (ret < 0)
break;
case IORING_OP_WRITEV:
case IORING_OP_WRITE_FIXED:
+ case IORING_OP_WRITE:
if (sqe) {
ret = io_write_prep(req, sqe, force_nonblock);
if (ret < 0)
ret = io_sync_file_range(req, nxt, force_nonblock);
break;
case IORING_OP_SENDMSG:
+ case IORING_OP_SEND:
if (sqe) {
ret = io_sendmsg_prep(req, sqe);
if (ret < 0)
break;
}
- ret = io_sendmsg(req, nxt, force_nonblock);
+ if (req->opcode == IORING_OP_SENDMSG)
+ ret = io_sendmsg(req, nxt, force_nonblock);
+ else
+ ret = io_send(req, nxt, force_nonblock);
break;
case IORING_OP_RECVMSG:
+ case IORING_OP_RECV:
if (sqe) {
ret = io_recvmsg_prep(req, sqe);
if (ret)
break;
}
- ret = io_recvmsg(req, nxt, force_nonblock);
+ if (req->opcode == IORING_OP_RECVMSG)
+ ret = io_recvmsg(req, nxt, force_nonblock);
+ else
+ ret = io_recv(req, nxt, force_nonblock);
break;
case IORING_OP_TIMEOUT:
if (sqe) {
}
ret = io_async_cancel(req, nxt);
break;
+ case IORING_OP_FALLOCATE:
+ if (sqe) {
+ ret = io_fallocate_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_fallocate(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_OPENAT:
+ if (sqe) {
+ ret = io_openat_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_openat(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_CLOSE:
+ if (sqe) {
+ ret = io_close_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_close(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_FILES_UPDATE:
+ if (sqe) {
+ ret = io_files_update_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_files_update(req, force_nonblock);
+ break;
+ case IORING_OP_STATX:
+ if (sqe) {
+ ret = io_statx_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_statx(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_FADVISE:
+ if (sqe) {
+ ret = io_fadvise_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_fadvise(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_MADVISE:
+ if (sqe) {
+ ret = io_madvise_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_madvise(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_OPENAT2:
+ if (sqe) {
+ ret = io_openat2_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_openat2(req, nxt, force_nonblock);
+ break;
+ case IORING_OP_EPOLL_CTL:
+ if (sqe) {
+ ret = io_epoll_ctl_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_epoll_ctl(req, nxt, force_nonblock);
+ break;
default:
ret = -EINVAL;
break;
struct io_kiocb *nxt = NULL;
int ret = 0;
- if (work->flags & IO_WQ_WORK_CANCEL)
+ /* if NO_CANCEL is set, we must still run the work */
+ if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) ==
+ IO_WQ_WORK_CANCEL) {
ret = -ECANCELED;
+ }
if (!ret) {
req->has_user = (work->flags & IO_WQ_WORK_HAS_MM) != 0;
io_wq_assign_next(workptr, nxt);
}
-static bool io_req_op_valid(int op)
+static int io_req_needs_file(struct io_kiocb *req, int fd)
{
- return op >= IORING_OP_NOP && op < IORING_OP_LAST;
-}
-
-static int io_req_needs_file(struct io_kiocb *req)
-{
- switch (req->opcode) {
- case IORING_OP_NOP:
- case IORING_OP_POLL_REMOVE:
- case IORING_OP_TIMEOUT:
- case IORING_OP_TIMEOUT_REMOVE:
- case IORING_OP_ASYNC_CANCEL:
- case IORING_OP_LINK_TIMEOUT:
+ if (!io_op_defs[req->opcode].needs_file)
return 0;
- default:
- if (io_req_op_valid(req->opcode))
- return 1;
- return -EINVAL;
- }
+ if (fd == -1 && io_op_defs[req->opcode].fd_non_neg)
+ return 0;
+ return 1;
}
static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
{
struct fixed_file_table *table;
- table = &ctx->file_table[index >> IORING_FILE_TABLE_SHIFT];
- return table->files[index & IORING_FILE_TABLE_MASK];
+ table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT];
+ return table->files[index & IORING_FILE_TABLE_MASK];;
}
static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
{
struct io_ring_ctx *ctx = req->ctx;
unsigned flags;
- int fd, ret;
+ int fd;
flags = READ_ONCE(sqe->flags);
fd = READ_ONCE(sqe->fd);
- if (flags & IOSQE_IO_DRAIN)
- req->flags |= REQ_F_IO_DRAIN;
-
- ret = io_req_needs_file(req);
- if (ret <= 0)
- return ret;
+ if (!io_req_needs_file(req, fd))
+ return 0;
if (flags & IOSQE_FIXED_FILE) {
- if (unlikely(!ctx->file_table ||
+ if (unlikely(!ctx->file_data ||
(unsigned) fd >= ctx->nr_user_files))
return -EBADF;
fd = array_index_nospec(fd, ctx->nr_user_files);
if (!req->file)
return -EBADF;
req->flags |= REQ_F_FIXED_FILE;
+ percpu_ref_get(&ctx->file_data->refs);
} else {
if (req->needs_fixed_file)
return -EBADF;
int ret = -EBADF;
struct io_ring_ctx *ctx = req->ctx;
+ if (req->work.files)
+ return 0;
+ if (!ctx->ring_file)
+ return -EBADF;
+
rcu_read_lock();
spin_lock_irq(&ctx->inflight_lock);
/*
* the fd has changed since we started down this path, and disallow
* this operation if it has.
*/
- if (fcheck(req->ring_fd) == req->ring_file) {
+ if (fcheck(ctx->ring_fd) == ctx->ring_file) {
list_add(&req->inflight_entry, &ctx->inflight_list);
req->flags |= REQ_F_INFLIGHT;
req->work.files = current->files;
*/
if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) ||
(req->flags & REQ_F_MUST_PUNT))) {
- if (req->work.flags & IO_WQ_WORK_NEEDS_FILES) {
+punt:
+ if (io_op_defs[req->opcode].file_table) {
ret = io_grab_files(req);
if (ret)
goto err;
if (nxt) {
req = nxt;
nxt = NULL;
+
+ if (req->flags & REQ_F_FORCE_ASYNC)
+ goto punt;
goto again;
}
}
{
int ret;
- if (unlikely(req->ctx->drain_next)) {
- req->flags |= REQ_F_IO_DRAIN;
- req->ctx->drain_next = false;
- }
- req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK);
-
ret = io_req_defer(req, sqe);
if (ret) {
if (ret != -EIOCBQUEUED) {
+fail_req:
io_cqring_add_event(req, ret);
req_set_fail_links(req);
io_double_put_req(req);
}
- } else
+ } else if (req->flags & REQ_F_FORCE_ASYNC) {
+ ret = io_req_defer_prep(req, sqe);
+ if (unlikely(ret < 0))
+ goto fail_req;
+ /*
+ * Never try inline submit of IOSQE_ASYNC is set, go straight
+ * to async execution.
+ */
+ req->work.flags |= IO_WQ_WORK_CONCURRENT;
+ io_queue_async_work(req);
+ } else {
__io_queue_sqe(req, sqe);
+ }
}
static inline void io_queue_link_head(struct io_kiocb *req)
}
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
- IOSQE_IO_HARDLINK)
+ IOSQE_IO_HARDLINK | IOSQE_ASYNC)
static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
struct io_submit_state *state, struct io_kiocb **link)
{
+ const struct cred *old_creds = NULL;
struct io_ring_ctx *ctx = req->ctx;
- int ret;
+ unsigned int sqe_flags;
+ int ret, id;
+
+ sqe_flags = READ_ONCE(sqe->flags);
/* enforce forwards compatibility on users */
- if (unlikely(sqe->flags & ~SQE_VALID_FLAGS)) {
+ if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) {
ret = -EINVAL;
goto err_req;
}
+ id = READ_ONCE(sqe->personality);
+ if (id) {
+ const struct cred *personality_creds;
+
+ personality_creds = idr_find(&ctx->personality_idr, id);
+ if (unlikely(!personality_creds)) {
+ ret = -EINVAL;
+ goto err_req;
+ }
+ old_creds = override_creds(personality_creds);
+ }
+
+ /* same numerical values with corresponding REQ_F_*, safe to copy */
+ req->flags |= sqe_flags & (IOSQE_IO_DRAIN|IOSQE_IO_HARDLINK|
+ IOSQE_ASYNC);
+
ret = io_req_set_file(state, req, sqe);
if (unlikely(ret)) {
err_req:
io_cqring_add_event(req, ret);
io_double_put_req(req);
+ if (old_creds)
+ revert_creds(old_creds);
return false;
}
* conditions are true (normal request), then just queue it.
*/
if (*link) {
- struct io_kiocb *prev = *link;
-
- if (sqe->flags & IOSQE_IO_DRAIN)
- (*link)->flags |= REQ_F_DRAIN_LINK | REQ_F_IO_DRAIN;
-
- if (sqe->flags & IOSQE_IO_HARDLINK)
- req->flags |= REQ_F_HARDLINK;
+ struct io_kiocb *head = *link;
+ /*
+ * Taking sequential execution of a link, draining both sides
+ * of the link also fullfils IOSQE_IO_DRAIN semantics for all
+ * requests in the link. So, it drains the head and the
+ * next after the link request. The last one is done via
+ * drain_next flag to persist the effect across calls.
+ */
+ if (sqe_flags & IOSQE_IO_DRAIN) {
+ head->flags |= REQ_F_IO_DRAIN;
+ ctx->drain_next = 1;
+ }
if (io_alloc_async_ctx(req)) {
ret = -EAGAIN;
goto err_req;
ret = io_req_defer_prep(req, sqe);
if (ret) {
/* fail even hard links since we don't submit */
- prev->flags |= REQ_F_FAIL_LINK;
+ head->flags |= REQ_F_FAIL_LINK;
goto err_req;
}
- trace_io_uring_link(ctx, req, prev);
- list_add_tail(&req->link_list, &prev->link_list);
- } else if (sqe->flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
- req->flags |= REQ_F_LINK;
- if (sqe->flags & IOSQE_IO_HARDLINK)
- req->flags |= REQ_F_HARDLINK;
-
- INIT_LIST_HEAD(&req->link_list);
- ret = io_req_defer_prep(req, sqe);
- if (ret)
- req->flags |= REQ_F_FAIL_LINK;
- *link = req;
+ trace_io_uring_link(ctx, req, head);
+ list_add_tail(&req->link_list, &head->link_list);
+
+ /* last request of a link, enqueue the link */
+ if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK))) {
+ io_queue_link_head(head);
+ *link = NULL;
+ }
} else {
- io_queue_sqe(req, sqe);
+ if (unlikely(ctx->drain_next)) {
+ req->flags |= REQ_F_IO_DRAIN;
+ req->ctx->drain_next = 0;
+ }
+ if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
+ req->flags |= REQ_F_LINK;
+ INIT_LIST_HEAD(&req->link_list);
+ ret = io_req_defer_prep(req, sqe);
+ if (ret)
+ req->flags |= REQ_F_FAIL_LINK;
+ *link = req;
+ } else {
+ io_queue_sqe(req, sqe);
+ }
}
+ if (old_creds)
+ revert_creds(old_creds);
return true;
}
{
struct io_rings *rings = ctx->rings;
- if (ctx->cached_sq_head != READ_ONCE(rings->sq.head)) {
- /*
- * Ensure any loads from the SQEs are done at this point,
- * since once we write the new head, the application could
- * write new data to them.
- */
- smp_store_release(&rings->sq.head, ctx->cached_sq_head);
- }
+ /*
+ * Ensure any loads from the SQEs are done at this point,
+ * since once we write the new head, the application could
+ * write new data to them.
+ */
+ smp_store_release(&rings->sq.head, ctx->cached_sq_head);
}
/*
static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req,
const struct io_uring_sqe **sqe_ptr)
{
- struct io_rings *rings = ctx->rings;
u32 *sq_array = ctx->sq_array;
unsigned head;
* 2) allows the kernel side to track the head on its own, even
* though the application is the one updating it.
*/
- head = ctx->cached_sq_head;
- /* make sure SQ entry isn't read before tail */
- if (unlikely(head == smp_load_acquire(&rings->sq.tail)))
- return false;
-
- head = READ_ONCE(sq_array[head & ctx->sq_mask]);
+ 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,
/* drop invalid entries */
ctx->cached_sq_head++;
ctx->cached_sq_dropped++;
- WRITE_ONCE(rings->sq_dropped, ctx->cached_sq_dropped);
+ WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped);
return false;
}
bool mm_fault = false;
/* if we have a backlog and couldn't flush it all, return BUSY */
- if (!list_empty(&ctx->cq_overflow_list) &&
- !io_cqring_overflow_flush(ctx, false))
- return -EBUSY;
+ if (test_bit(0, &ctx->sq_check_overflow)) {
+ if (!list_empty(&ctx->cq_overflow_list) &&
+ !io_cqring_overflow_flush(ctx, false))
+ return -EBUSY;
+ }
+
+ /* make sure SQ entry isn't read before tail */
+ nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx));
+
+ if (!percpu_ref_tryget_many(&ctx->refs, nr))
+ return -EAGAIN;
if (nr > IO_PLUG_THRESHOLD) {
io_submit_state_start(&state, nr);
statep = &state;
}
+ ctx->ring_fd = ring_fd;
+ ctx->ring_file = ring_file;
+
for (i = 0; i < nr; i++) {
const struct io_uring_sqe *sqe;
struct io_kiocb *req;
- unsigned int sqe_flags;
req = io_get_req(ctx, statep);
if (unlikely(!req)) {
break;
}
if (!io_get_sqring(ctx, req, &sqe)) {
- __io_free_req(req);
+ __io_req_do_free(req);
+ break;
+ }
+
+ /* will complete beyond this point, count as submitted */
+ submitted++;
+
+ if (unlikely(req->opcode >= IORING_OP_LAST)) {
+ io_cqring_add_event(req, -EINVAL);
+ io_double_put_req(req);
break;
}
- if (io_req_needs_user(req) && !*mm) {
+ if (io_op_defs[req->opcode].needs_mm && !*mm) {
mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
if (!mm_fault) {
use_mm(ctx->sqo_mm);
}
}
- submitted++;
- sqe_flags = sqe->flags;
-
- req->ring_file = ring_file;
- req->ring_fd = ring_fd;
req->has_user = *mm != NULL;
req->in_async = async;
req->needs_fixed_file = async;
- trace_io_uring_submit_sqe(ctx, req->user_data, true, async);
+ trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
+ true, async);
if (!io_submit_sqe(req, sqe, statep, &link))
break;
- /*
- * If previous wasn't linked and we have a linked command,
- * that's the end of the chain. Submit the previous link.
- */
- if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) && link) {
- io_queue_link_head(link);
- link = NULL;
- }
}
+ if (unlikely(submitted != nr)) {
+ int ref_used = (submitted == -EAGAIN) ? 0 : submitted;
+
+ percpu_ref_put_many(&ctx->refs, nr - ref_used);
+ }
if (link)
io_queue_link_head(link);
if (statep)
ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP;
}
- to_submit = min(to_submit, ctx->sq_entries);
mutex_lock(&ctx->uring_lock);
ret = io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm, true);
mutex_unlock(&ctx->uring_lock);
#endif
}
+static void io_file_ref_kill(struct percpu_ref *ref)
+{
+ struct fixed_file_data *data;
+
+ data = container_of(ref, struct fixed_file_data, refs);
+ complete(&data->done);
+}
+
static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
{
+ struct fixed_file_data *data = ctx->file_data;
unsigned nr_tables, i;
- if (!ctx->file_table)
+ if (!data)
return -ENXIO;
+ /* protect against inflight atomic switch, which drops the ref */
+ percpu_ref_get(&data->refs);
+ /* wait for existing switches */
+ flush_work(&data->ref_work);
+ percpu_ref_kill_and_confirm(&data->refs, io_file_ref_kill);
+ wait_for_completion(&data->done);
+ percpu_ref_put(&data->refs);
+ /* flush potential new switch */
+ flush_work(&data->ref_work);
+ percpu_ref_exit(&data->refs);
+
__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(ctx->file_table[i].files);
- kfree(ctx->file_table);
- ctx->file_table = NULL;
+ kfree(data->table[i].files);
+ kfree(data->table);
+ kfree(data);
+ ctx->file_data = NULL;
ctx->nr_user_files = 0;
return 0;
}
}
#if defined(CONFIG_UNIX)
-static void io_destruct_skb(struct sk_buff *skb)
-{
- struct io_ring_ctx *ctx = skb->sk->sk_user_data;
-
- if (ctx->io_wq)
- io_wq_flush(ctx->io_wq);
-
- unix_destruct_scm(skb);
-}
-
/*
* Ensure the UNIX gc is aware of our file set, so we are certain that
* the io_uring can be safely unregistered on process exit, even if we have
fpl->max = SCM_MAX_FD;
fpl->count = nr_files;
UNIXCB(skb).fp = fpl;
- skb->destructor = io_destruct_skb;
+ skb->destructor = unix_destruct_scm;
refcount_add(skb->truesize, &sk->sk_wmem_alloc);
skb_queue_head(&sk->sk_receive_queue, skb);
}
#endif
-static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables,
- unsigned nr_files)
+static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables,
+ unsigned nr_files)
+{
+ int i;
+
+ for (i = 0; i < nr_tables; i++) {
+ struct fixed_file_table *table = &ctx->file_data->table[i];
+ unsigned this_files;
+
+ this_files = min(nr_files, IORING_MAX_FILES_TABLE);
+ table->files = kcalloc(this_files, sizeof(struct file *),
+ GFP_KERNEL);
+ if (!table->files)
+ break;
+ nr_files -= this_files;
+ }
+
+ if (i == nr_tables)
+ return 0;
+
+ for (i = 0; i < nr_tables; i++) {
+ struct fixed_file_table *table = &ctx->file_data->table[i];
+ kfree(table->files);
+ }
+ return 1;
+}
+
+static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file)
+{
+#if defined(CONFIG_UNIX)
+ struct sock *sock = ctx->ring_sock->sk;
+ struct sk_buff_head list, *head = &sock->sk_receive_queue;
+ struct sk_buff *skb;
+ int i;
+
+ __skb_queue_head_init(&list);
+
+ /*
+ * Find the skb that holds this file in its SCM_RIGHTS. When found,
+ * remove this entry and rearrange the file array.
+ */
+ skb = skb_dequeue(head);
+ while (skb) {
+ struct scm_fp_list *fp;
+
+ fp = UNIXCB(skb).fp;
+ for (i = 0; i < fp->count; i++) {
+ int left;
+
+ if (fp->fp[i] != file)
+ continue;
+
+ unix_notinflight(fp->user, fp->fp[i]);
+ left = fp->count - 1 - i;
+ if (left) {
+ memmove(&fp->fp[i], &fp->fp[i + 1],
+ left * sizeof(struct file *));
+ }
+ fp->count--;
+ if (!fp->count) {
+ kfree_skb(skb);
+ skb = NULL;
+ } else {
+ __skb_queue_tail(&list, skb);
+ }
+ fput(file);
+ file = NULL;
+ break;
+ }
+
+ if (!file)
+ break;
+
+ __skb_queue_tail(&list, skb);
+
+ skb = skb_dequeue(head);
+ }
+
+ if (skb_peek(&list)) {
+ spin_lock_irq(&head->lock);
+ while ((skb = __skb_dequeue(&list)) != NULL)
+ __skb_queue_tail(head, skb);
+ spin_unlock_irq(&head->lock);
+ }
+#else
+ fput(file);
+#endif
+}
+
+struct io_file_put {
+ struct llist_node llist;
+ struct file *file;
+ struct completion *done;
+};
+
+static void io_ring_file_ref_switch(struct work_struct *work)
{
- int i;
+ struct io_file_put *pfile, *tmp;
+ struct fixed_file_data *data;
+ struct llist_node *node;
- for (i = 0; i < nr_tables; i++) {
- struct fixed_file_table *table = &ctx->file_table[i];
- unsigned this_files;
+ data = container_of(work, struct fixed_file_data, ref_work);
- this_files = min(nr_files, IORING_MAX_FILES_TABLE);
- table->files = kcalloc(this_files, sizeof(struct file *),
- GFP_KERNEL);
- if (!table->files)
- break;
- nr_files -= this_files;
+ 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);
+ if (pfile->done)
+ complete(pfile->done);
+ else
+ kfree(pfile);
+ }
}
- if (i == nr_tables)
- return 0;
+ percpu_ref_get(&data->refs);
+ percpu_ref_switch_to_percpu(&data->refs);
+}
- for (i = 0; i < nr_tables; i++) {
- struct fixed_file_table *table = &ctx->file_table[i];
- kfree(table->files);
- }
- return 1;
+static void io_file_data_ref_zero(struct percpu_ref *ref)
+{
+ struct fixed_file_data *data;
+
+ data = container_of(ref, struct fixed_file_data, refs);
+
+ /* we can't safely switch from inside this context, punt to wq */
+ queue_work(system_wq, &data->ref_work);
}
static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
{
__s32 __user *fds = (__s32 __user *) arg;
unsigned nr_tables;
+ struct file *file;
int fd, ret = 0;
unsigned i;
- if (ctx->file_table)
+ if (ctx->file_data)
return -EBUSY;
if (!nr_args)
return -EINVAL;
if (nr_args > IORING_MAX_FIXED_FILES)
return -EMFILE;
+ ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL);
+ if (!ctx->file_data)
+ return -ENOMEM;
+ ctx->file_data->ctx = ctx;
+ init_completion(&ctx->file_data->done);
+
nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
- ctx->file_table = kcalloc(nr_tables, sizeof(struct fixed_file_table),
+ ctx->file_data->table = kcalloc(nr_tables,
+ sizeof(struct fixed_file_table),
GFP_KERNEL);
- if (!ctx->file_table)
+ if (!ctx->file_data->table) {
+ kfree(ctx->file_data);
+ ctx->file_data = NULL;
+ return -ENOMEM;
+ }
+
+ if (percpu_ref_init(&ctx->file_data->refs, io_file_data_ref_zero,
+ 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)) {
- kfree(ctx->file_table);
- ctx->file_table = NULL;
+ percpu_ref_exit(&ctx->file_data->refs);
+ kfree(ctx->file_data->table);
+ kfree(ctx->file_data);
+ ctx->file_data = NULL;
return -ENOMEM;
}
continue;
}
- table = &ctx->file_table[i >> IORING_FILE_TABLE_SHIFT];
+ table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
- table->files[index] = fget(fd);
+ file = fget(fd);
ret = -EBADF;
- if (!table->files[index])
+ if (!file)
break;
+
/*
* Don't allow io_uring instances to be registered. If UNIX
* isn't enabled, then this causes a reference cycle and this
* handle it just fine, but there's still no point in allowing
* a ring fd as it doesn't support regular read/write anyway.
*/
- if (table->files[index]->f_op == &io_uring_fops) {
- fput(table->files[index]);
+ if (file->f_op == &io_uring_fops) {
+ fput(file);
break;
}
ret = 0;
+ table->files[index] = file;
}
if (ret) {
for (i = 0; i < ctx->nr_user_files; i++) {
- struct file *file;
-
file = io_file_from_index(ctx, i);
if (file)
fput(file);
}
for (i = 0; i < nr_tables; i++)
- kfree(ctx->file_table[i].files);
+ kfree(ctx->file_data->table[i].files);
- kfree(ctx->file_table);
- ctx->file_table = NULL;
+ kfree(ctx->file_data->table);
+ kfree(ctx->file_data);
+ ctx->file_data = NULL;
ctx->nr_user_files = 0;
return ret;
}
return ret;
}
-static void io_sqe_file_unregister(struct io_ring_ctx *ctx, int index)
-{
-#if defined(CONFIG_UNIX)
- struct file *file = io_file_from_index(ctx, index);
- struct sock *sock = ctx->ring_sock->sk;
- struct sk_buff_head list, *head = &sock->sk_receive_queue;
- struct sk_buff *skb;
- int i;
-
- __skb_queue_head_init(&list);
-
- /*
- * Find the skb that holds this file in its SCM_RIGHTS. When found,
- * remove this entry and rearrange the file array.
- */
- skb = skb_dequeue(head);
- while (skb) {
- struct scm_fp_list *fp;
-
- fp = UNIXCB(skb).fp;
- for (i = 0; i < fp->count; i++) {
- int left;
-
- if (fp->fp[i] != file)
- continue;
-
- unix_notinflight(fp->user, fp->fp[i]);
- left = fp->count - 1 - i;
- if (left) {
- memmove(&fp->fp[i], &fp->fp[i + 1],
- left * sizeof(struct file *));
- }
- fp->count--;
- if (!fp->count) {
- kfree_skb(skb);
- skb = NULL;
- } else {
- __skb_queue_tail(&list, skb);
- }
- fput(file);
- file = NULL;
- break;
- }
-
- if (!file)
- break;
-
- __skb_queue_tail(&list, skb);
-
- skb = skb_dequeue(head);
- }
-
- if (skb_peek(&list)) {
- spin_lock_irq(&head->lock);
- while ((skb = __skb_dequeue(&list)) != NULL)
- __skb_queue_tail(head, skb);
- spin_unlock_irq(&head->lock);
- }
-#else
- fput(io_file_from_index(ctx, index));
-#endif
-}
-
static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
int index)
{
#endif
}
-static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg,
- unsigned nr_args)
+static void io_atomic_switch(struct percpu_ref *ref)
{
- struct io_uring_files_update up;
+ struct fixed_file_data *data;
+
+ data = container_of(ref, struct fixed_file_data, refs);
+ clear_bit(FFD_F_ATOMIC, &data->state);
+}
+
+static bool io_queue_file_removal(struct fixed_file_data *data,
+ struct file *file)
+{
+ struct io_file_put *pfile, pfile_stack;
+ DECLARE_COMPLETION_ONSTACK(done);
+
+ /*
+ * If we fail allocating the struct we need for doing async reomval
+ * of this file, just punt to sync and wait for it.
+ */
+ pfile = kzalloc(sizeof(*pfile), GFP_KERNEL);
+ if (!pfile) {
+ pfile = &pfile_stack;
+ pfile->done = &done;
+ }
+
+ pfile->file = file;
+ llist_add(&pfile->llist, &data->put_llist);
+
+ if (pfile == &pfile_stack) {
+ if (!test_and_set_bit(FFD_F_ATOMIC, &data->state)) {
+ percpu_ref_put(&data->refs);
+ percpu_ref_switch_to_atomic(&data->refs,
+ io_atomic_switch);
+ }
+ wait_for_completion(&done);
+ flush_work(&data->ref_work);
+ return false;
+ }
+
+ return true;
+}
+
+static int __io_sqe_files_update(struct io_ring_ctx *ctx,
+ struct io_uring_files_update *up,
+ unsigned nr_args)
+{
+ struct fixed_file_data *data = ctx->file_data;
+ bool ref_switch = false;
+ struct file *file;
__s32 __user *fds;
int fd, i, err;
__u32 done;
- if (!ctx->file_table)
- return -ENXIO;
- if (!nr_args)
- return -EINVAL;
- if (copy_from_user(&up, arg, sizeof(up)))
- return -EFAULT;
- if (up.resv)
- return -EINVAL;
- if (check_add_overflow(up.offset, nr_args, &done))
+ if (check_add_overflow(up->offset, nr_args, &done))
return -EOVERFLOW;
if (done > ctx->nr_user_files)
return -EINVAL;
done = 0;
- fds = u64_to_user_ptr(up.fds);
+ fds = u64_to_user_ptr(up->fds);
while (nr_args) {
struct fixed_file_table *table;
unsigned index;
err = -EFAULT;
break;
}
- i = array_index_nospec(up.offset, ctx->nr_user_files);
- table = &ctx->file_table[i >> IORING_FILE_TABLE_SHIFT];
+ i = array_index_nospec(up->offset, ctx->nr_user_files);
+ table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
if (table->files[index]) {
- io_sqe_file_unregister(ctx, i);
+ file = io_file_from_index(ctx, index);
table->files[index] = NULL;
+ if (io_queue_file_removal(data, file))
+ ref_switch = true;
}
if (fd != -1) {
- struct file *file;
-
file = fget(fd);
if (!file) {
err = -EBADF;
}
nr_args--;
done++;
- up.offset++;
+ up->offset++;
+ }
+
+ if (ref_switch && !test_and_set_bit(FFD_F_ATOMIC, &data->state)) {
+ percpu_ref_put(&data->refs);
+ percpu_ref_switch_to_atomic(&data->refs, io_atomic_switch);
}
return done ? done : err;
}
+static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg,
+ unsigned nr_args)
+{
+ struct io_uring_files_update up;
+
+ if (!ctx->file_data)
+ return -ENXIO;
+ if (!nr_args)
+ return -EINVAL;
+ if (copy_from_user(&up, arg, sizeof(up)))
+ return -EFAULT;
+ if (up.resv)
+ return -EINVAL;
+
+ return __io_sqe_files_update(ctx, &up, nr_args);
+}
static void io_put_work(struct io_wq_work *work)
{
refcount_inc(&req->refs);
}
+static int io_init_wq_offload(struct io_ring_ctx *ctx,
+ struct io_uring_params *p)
+{
+ struct io_wq_data data;
+ struct fd f;
+ struct io_ring_ctx *ctx_attach;
+ unsigned int concurrency;
+ int ret = 0;
+
+ data.user = ctx->user;
+ data.get_work = io_get_work;
+ data.put_work = io_put_work;
+
+ if (!(p->flags & IORING_SETUP_ATTACH_WQ)) {
+ /* Do QD, or 4 * CPUS, whatever is smallest */
+ concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
+
+ ctx->io_wq = io_wq_create(concurrency, &data);
+ if (IS_ERR(ctx->io_wq)) {
+ ret = PTR_ERR(ctx->io_wq);
+ ctx->io_wq = NULL;
+ }
+ return ret;
+ }
+
+ f = fdget(p->wq_fd);
+ if (!f.file)
+ return -EBADF;
+
+ if (f.file->f_op != &io_uring_fops) {
+ ret = -EINVAL;
+ goto out_fput;
+ }
+
+ ctx_attach = f.file->private_data;
+ /* @io_wq is protected by holding the fd */
+ if (!io_wq_get(ctx_attach->io_wq, &data)) {
+ ret = -EINVAL;
+ goto out_fput;
+ }
+
+ ctx->io_wq = ctx_attach->io_wq;
+out_fput:
+ fdput(f);
+ return ret;
+}
+
static int io_sq_offload_start(struct io_ring_ctx *ctx,
struct io_uring_params *p)
{
- struct io_wq_data data;
- unsigned concurrency;
int ret;
init_waitqueue_head(&ctx->sqo_wait);
goto err;
}
- data.mm = ctx->sqo_mm;
- data.user = ctx->user;
- data.creds = ctx->creds;
- data.get_work = io_get_work;
- data.put_work = io_put_work;
-
- /* Do QD, or 4 * CPUS, whatever is smallest */
- concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
- ctx->io_wq = io_wq_create(concurrency, &data);
- if (IS_ERR(ctx->io_wq)) {
- ret = PTR_ERR(ctx->io_wq);
- ctx->io_wq = NULL;
+ ret = io_init_wq_offload(ctx, p);
+ if (ret)
goto err;
- }
return 0;
err:
return fasync_helper(fd, file, on, &ctx->cq_fasync);
}
+static int io_remove_personalities(int id, void *p, void *data)
+{
+ struct io_ring_ctx *ctx = data;
+ const struct cred *cred;
+
+ cred = idr_remove(&ctx->personality_idr, id);
+ if (cred)
+ put_cred(cred);
+ return 0;
+}
+
static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
{
mutex_lock(&ctx->uring_lock);
/* if we failed setting up the ctx, we might not have any rings */
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);
}
} else if (to_submit) {
struct mm_struct *cur_mm;
- to_submit = min(to_submit, ctx->sq_entries);
mutex_lock(&ctx->uring_lock);
/* already have mm, so io_submit_sqes() won't try to grab it */
cur_mm = ctx->sqo_mm;
#if defined(CONFIG_UNIX)
ctx->ring_sock->file = file;
- ctx->ring_sock->sk->sk_user_data = ctx;
#endif
fd_install(ret, file);
return ret;
bool account_mem;
int ret;
- if (!entries || entries > IORING_MAX_ENTRIES)
+ if (!entries)
return -EINVAL;
+ if (entries > IORING_MAX_ENTRIES) {
+ if (!(p->flags & IORING_SETUP_CLAMP))
+ return -EINVAL;
+ entries = IORING_MAX_ENTRIES;
+ }
/*
* Use twice as many entries for the CQ ring. It's possible for the
* to a power-of-two, if it isn't already. We do NOT impose
* any cq vs sq ring sizing.
*/
- if (p->cq_entries < p->sq_entries || p->cq_entries > IORING_MAX_CQ_ENTRIES)
+ if (p->cq_entries < p->sq_entries)
return -EINVAL;
+ if (p->cq_entries > IORING_MAX_CQ_ENTRIES) {
+ if (!(p->flags & IORING_SETUP_CLAMP))
+ return -EINVAL;
+ p->cq_entries = IORING_MAX_CQ_ENTRIES;
+ }
p->cq_entries = roundup_pow_of_two(p->cq_entries);
} else {
p->cq_entries = 2 * p->sq_entries;
goto err;
p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP |
- IORING_FEAT_SUBMIT_STABLE;
+ IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS |
+ IORING_FEAT_CUR_PERSONALITY;
trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags);
return ret;
err:
}
if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL |
- IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE))
+ IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE |
+ IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ))
return -EINVAL;
ret = io_uring_create(entries, &p);
return io_uring_setup(entries, params);
}
+static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args)
+{
+ struct io_uring_probe *p;
+ size_t size;
+ int i, ret;
+
+ size = struct_size(p, ops, nr_args);
+ if (size == SIZE_MAX)
+ return -EOVERFLOW;
+ p = kzalloc(size, GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ ret = -EFAULT;
+ if (copy_from_user(p, arg, size))
+ goto out;
+ ret = -EINVAL;
+ if (memchr_inv(p, 0, size))
+ goto out;
+
+ p->last_op = IORING_OP_LAST - 1;
+ if (nr_args > IORING_OP_LAST)
+ nr_args = IORING_OP_LAST;
+
+ for (i = 0; i < nr_args; i++) {
+ p->ops[i].op = i;
+ if (!io_op_defs[i].not_supported)
+ p->ops[i].flags = IO_URING_OP_SUPPORTED;
+ }
+ p->ops_len = i;
+
+ ret = 0;
+ if (copy_to_user(arg, p, size))
+ ret = -EFAULT;
+out:
+ kfree(p);
+ return ret;
+}
+
+static int io_register_personality(struct io_ring_ctx *ctx)
+{
+ const struct cred *creds = get_current_cred();
+ int id;
+
+ id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1,
+ USHRT_MAX, GFP_KERNEL);
+ if (id < 0)
+ put_cred(creds);
+ return id;
+}
+
+static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
+{
+ const struct cred *old_creds;
+
+ old_creds = idr_remove(&ctx->personality_idr, id);
+ if (old_creds) {
+ put_cred(old_creds);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static bool io_register_op_must_quiesce(int op)
+{
+ switch (op) {
+ case IORING_UNREGISTER_FILES:
+ case IORING_REGISTER_FILES_UPDATE:
+ case IORING_REGISTER_PROBE:
+ case IORING_REGISTER_PERSONALITY:
+ case IORING_UNREGISTER_PERSONALITY:
+ return false;
+ default:
+ return true;
+ }
+}
+
static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
void __user *arg, unsigned nr_args)
__releases(ctx->uring_lock)
if (percpu_ref_is_dying(&ctx->refs))
return -ENXIO;
- percpu_ref_kill(&ctx->refs);
+ if (io_register_op_must_quiesce(opcode)) {
+ percpu_ref_kill(&ctx->refs);
- /*
- * Drop uring mutex before waiting for references to exit. If another
- * thread is currently inside io_uring_enter() it might need to grab
- * the uring_lock to make progress. If we hold it here across the drain
- * wait, then we can deadlock. It's safe to drop the mutex here, since
- * no new references will come in after we've killed the percpu ref.
- */
- mutex_unlock(&ctx->uring_lock);
- wait_for_completion(&ctx->completions[0]);
- mutex_lock(&ctx->uring_lock);
+ /*
+ * Drop uring mutex before waiting for references to exit. If
+ * another thread is currently inside io_uring_enter() it might
+ * need to grab the uring_lock to make progress. If we hold it
+ * here across the drain wait, then we can deadlock. It's safe
+ * to drop the mutex here, since no new references will come in
+ * after we've killed the percpu ref.
+ */
+ mutex_unlock(&ctx->uring_lock);
+ ret = wait_for_completion_interruptible(&ctx->completions[0]);
+ mutex_lock(&ctx->uring_lock);
+ if (ret) {
+ percpu_ref_resurrect(&ctx->refs);
+ ret = -EINTR;
+ goto out;
+ }
+ }
switch (opcode) {
case IORING_REGISTER_BUFFERS:
ret = io_sqe_files_update(ctx, arg, nr_args);
break;
case IORING_REGISTER_EVENTFD:
+ case IORING_REGISTER_EVENTFD_ASYNC:
ret = -EINVAL;
if (nr_args != 1)
break;
ret = io_eventfd_register(ctx, arg);
+ if (ret)
+ break;
+ if (opcode == IORING_REGISTER_EVENTFD_ASYNC)
+ ctx->eventfd_async = 1;
+ else
+ ctx->eventfd_async = 0;
break;
case IORING_UNREGISTER_EVENTFD:
ret = -EINVAL;
break;
ret = io_eventfd_unregister(ctx);
break;
+ case IORING_REGISTER_PROBE:
+ ret = -EINVAL;
+ if (!arg || nr_args > 256)
+ break;
+ ret = io_probe(ctx, arg, nr_args);
+ break;
+ case IORING_REGISTER_PERSONALITY:
+ ret = -EINVAL;
+ if (arg || nr_args)
+ break;
+ ret = io_register_personality(ctx);
+ break;
+ case IORING_UNREGISTER_PERSONALITY:
+ ret = -EINVAL;
+ if (arg)
+ break;
+ ret = io_unregister_personality(ctx, nr_args);
+ break;
default:
ret = -EINVAL;
break;
}
- /* bring the ctx back to life */
- reinit_completion(&ctx->completions[0]);
- percpu_ref_reinit(&ctx->refs);
+ if (io_register_op_must_quiesce(opcode)) {
+ /* bring the ctx back to life */
+ percpu_ref_reinit(&ctx->refs);
+out:
+ reinit_completion(&ctx->completions[0]);
+ }
return ret;
}
static int __init io_uring_init(void)
{
+ BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
return 0;
};
git.samba.org / sfrench / cifs-2.6.git / blobdiff