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-rw-r--r--fs/io_uring.c1234
1 files changed, 763 insertions, 471 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9b1833fedc5c..187dd94fd6b1 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -289,7 +289,10 @@ struct io_ring_ctx {
*/
struct io_poll_iocb {
struct file *file;
- struct wait_queue_head *head;
+ union {
+ struct wait_queue_head *head;
+ u64 addr;
+ };
__poll_t events;
bool done;
bool canceled;
@@ -304,6 +307,51 @@ struct io_timeout_data {
u32 seq_offset;
};
+struct io_accept {
+ struct file *file;
+ struct sockaddr __user *addr;
+ int __user *addr_len;
+ int flags;
+};
+
+struct io_sync {
+ struct file *file;
+ loff_t len;
+ loff_t off;
+ int flags;
+};
+
+struct io_cancel {
+ struct file *file;
+ u64 addr;
+};
+
+struct io_timeout {
+ struct file *file;
+ u64 addr;
+ int flags;
+ unsigned count;
+};
+
+struct io_rw {
+ /* NOTE: kiocb has the file as the first member, so don't do it here */
+ struct kiocb kiocb;
+ u64 addr;
+ u64 len;
+};
+
+struct io_connect {
+ struct file *file;
+ struct sockaddr __user *addr;
+ int addr_len;
+};
+
+struct io_sr_msg {
+ struct file *file;
+ struct user_msghdr __user *msg;
+ int msg_flags;
+};
+
struct io_async_connect {
struct sockaddr_storage address;
};
@@ -323,7 +371,6 @@ struct io_async_rw {
};
struct io_async_ctx {
- struct io_uring_sqe sqe;
union {
struct io_async_rw rw;
struct io_async_msghdr msg;
@@ -341,17 +388,23 @@ struct io_async_ctx {
struct io_kiocb {
union {
struct file *file;
- struct kiocb rw;
+ struct io_rw rw;
struct io_poll_iocb poll;
+ struct io_accept accept;
+ struct io_sync sync;
+ struct io_cancel cancel;
+ struct io_timeout timeout;
+ struct io_connect connect;
+ struct io_sr_msg sr_msg;
};
- const struct io_uring_sqe *sqe;
struct io_async_ctx *io;
struct file *ring_file;
int ring_fd;
bool has_user;
bool in_async;
bool needs_fixed_file;
+ u8 opcode;
struct io_ring_ctx *ctx;
union {
@@ -564,12 +617,10 @@ static void __io_commit_cqring(struct io_ring_ctx *ctx)
}
}
-static inline bool io_sqe_needs_user(const struct io_uring_sqe *sqe)
+static inline bool io_req_needs_user(struct io_kiocb *req)
{
- u8 opcode = READ_ONCE(sqe->opcode);
-
- return !(opcode == IORING_OP_READ_FIXED ||
- opcode == IORING_OP_WRITE_FIXED);
+ return !(req->opcode == IORING_OP_READ_FIXED ||
+ req->opcode == IORING_OP_WRITE_FIXED);
}
static inline bool io_prep_async_work(struct io_kiocb *req,
@@ -577,33 +628,31 @@ static inline bool io_prep_async_work(struct io_kiocb *req,
{
bool do_hashed = false;
- if (req->sqe) {
- switch (req->sqe->opcode) {
- case IORING_OP_WRITEV:
- case IORING_OP_WRITE_FIXED:
- /* only regular files should be hashed for writes */
- if (req->flags & REQ_F_ISREG)
- 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))
- req->work.flags |= IO_WQ_WORK_UNBOUND;
- break;
- }
- if (io_sqe_needs_user(req->sqe))
- req->work.flags |= IO_WQ_WORK_NEEDS_USER;
+ 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)
+ 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))
+ req->work.flags |= IO_WQ_WORK_UNBOUND;
+ break;
}
+ if (io_req_needs_user(req))
+ req->work.flags |= IO_WQ_WORK_NEEDS_USER;
*link = io_prep_linked_timeout(req);
return do_hashed;
@@ -972,7 +1021,7 @@ static void io_fail_links(struct io_kiocb *req)
trace_io_uring_fail_link(req, link);
if ((req->flags & REQ_F_LINK_TIMEOUT) &&
- link->sqe->opcode == IORING_OP_LINK_TIMEOUT) {
+ link->opcode == IORING_OP_LINK_TIMEOUT) {
io_link_cancel_timeout(link);
} else {
io_cqring_fill_event(link, -ECANCELED);
@@ -1148,7 +1197,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
ret = 0;
list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) {
- struct kiocb *kiocb = &req->rw;
+ struct kiocb *kiocb = &req->rw.kiocb;
/*
* Move completed entries to our local list. If we find a
@@ -1178,7 +1227,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
}
/*
- * Poll for a mininum of 'min' events. Note that if min == 0 we consider that a
+ * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a
* non-spinning poll check - we'll still enter the driver poll loop, but only
* as a non-spinning completion check.
*/
@@ -1303,7 +1352,7 @@ static inline void req_set_fail_links(struct io_kiocb *req)
static void io_complete_rw_common(struct kiocb *kiocb, long res)
{
- struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
+ struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
@@ -1315,7 +1364,7 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res)
static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
{
- struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
+ struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
io_complete_rw_common(kiocb, res);
io_put_req(req);
@@ -1323,7 +1372,7 @@ static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
static struct io_kiocb *__io_complete_rw(struct kiocb *kiocb, long res)
{
- struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
+ struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
struct io_kiocb *nxt = NULL;
io_complete_rw_common(kiocb, res);
@@ -1334,7 +1383,7 @@ static struct io_kiocb *__io_complete_rw(struct kiocb *kiocb, long res)
static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
{
- struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
+ struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
@@ -1368,7 +1417,7 @@ static void io_iopoll_req_issued(struct io_kiocb *req)
list_req = list_first_entry(&ctx->poll_list, struct io_kiocb,
list);
- if (list_req->rw.ki_filp != req->rw.ki_filp)
+ if (list_req->file != req->file)
ctx->poll_multi_file = true;
}
@@ -1439,11 +1488,11 @@ static bool io_file_supports_async(struct file *file)
return false;
}
-static int io_prep_rw(struct io_kiocb *req, bool force_nonblock)
+static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
+ bool force_nonblock)
{
- const struct io_uring_sqe *sqe = req->sqe;
struct io_ring_ctx *ctx = req->ctx;
- struct kiocb *kiocb = &req->rw;
+ struct kiocb *kiocb = &req->rw.kiocb;
unsigned ioprio;
int ret;
@@ -1492,6 +1541,12 @@ static int io_prep_rw(struct io_kiocb *req, bool force_nonblock)
return -EINVAL;
kiocb->ki_complete = io_complete_rw;
}
+
+ req->rw.addr = READ_ONCE(sqe->addr);
+ req->rw.len = READ_ONCE(sqe->len);
+ /* we own ->private, reuse it for the buffer index */
+ req->rw.kiocb.private = (void *) (unsigned long)
+ READ_ONCE(sqe->buf_index);
return 0;
}
@@ -1525,11 +1580,11 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret, struct io_kiocb **nxt,
io_rw_done(kiocb, ret);
}
-static ssize_t io_import_fixed(struct io_ring_ctx *ctx, int rw,
- const struct io_uring_sqe *sqe,
+static ssize_t io_import_fixed(struct io_kiocb *req, int rw,
struct iov_iter *iter)
{
- size_t len = READ_ONCE(sqe->len);
+ struct io_ring_ctx *ctx = req->ctx;
+ size_t len = req->rw.len;
struct io_mapped_ubuf *imu;
unsigned index, buf_index;
size_t offset;
@@ -1539,13 +1594,13 @@ static ssize_t io_import_fixed(struct io_ring_ctx *ctx, int rw,
if (unlikely(!ctx->user_bufs))
return -EFAULT;
- buf_index = READ_ONCE(sqe->buf_index);
+ buf_index = (unsigned long) req->rw.kiocb.private;
if (unlikely(buf_index >= ctx->nr_user_bufs))
return -EFAULT;
index = array_index_nospec(buf_index, ctx->nr_user_bufs);
imu = &ctx->user_bufs[index];
- buf_addr = READ_ONCE(sqe->addr);
+ buf_addr = req->rw.addr;
/* overflow */
if (buf_addr + len < buf_addr)
@@ -1602,25 +1657,20 @@ static ssize_t io_import_fixed(struct io_ring_ctx *ctx, int rw,
static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
struct iovec **iovec, struct iov_iter *iter)
{
- const struct io_uring_sqe *sqe = req->sqe;
- void __user *buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
- size_t sqe_len = READ_ONCE(sqe->len);
+ void __user *buf = u64_to_user_ptr(req->rw.addr);
+ size_t sqe_len = req->rw.len;
u8 opcode;
- /*
- * We're reading ->opcode for the second time, but the first read
- * doesn't care whether it's _FIXED or not, so it doesn't matter
- * whether ->opcode changes concurrently. The first read does care
- * about whether it is a READ or a WRITE, so we don't trust this read
- * for that purpose and instead let the caller pass in the read/write
- * flag.
- */
- opcode = READ_ONCE(sqe->opcode);
+ opcode = req->opcode;
if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) {
*iovec = NULL;
- return io_import_fixed(req->ctx, rw, sqe, iter);
+ return io_import_fixed(req, rw, iter);
}
+ /* buffer index only valid with fixed read/write */
+ if (req->rw.kiocb.private)
+ return -EINVAL;
+
if (req->io) {
struct io_async_rw *iorw = &req->io->rw;
@@ -1701,7 +1751,7 @@ static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb,
return ret;
}
-static void io_req_map_io(struct io_kiocb *req, ssize_t io_size,
+static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size,
struct iovec *iovec, struct iovec *fast_iov,
struct iov_iter *iter)
{
@@ -1715,57 +1765,85 @@ static void io_req_map_io(struct io_kiocb *req, ssize_t io_size,
}
}
-static int io_setup_async_io(struct io_kiocb *req, ssize_t io_size,
+static int io_alloc_async_ctx(struct io_kiocb *req)
+{
+ req->io = kmalloc(sizeof(*req->io), GFP_KERNEL);
+ return req->io == NULL;
+}
+
+static void io_rw_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->rw.iov;
+ io_wq_submit_work(workptr);
+ kfree(iov);
+}
+
+static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size,
struct iovec *iovec, struct iovec *fast_iov,
struct iov_iter *iter)
{
- req->io = kmalloc(sizeof(*req->io), GFP_KERNEL);
- if (req->io) {
- io_req_map_io(req, io_size, iovec, fast_iov, iter);
- memcpy(&req->io->sqe, req->sqe, sizeof(req->io->sqe));
- req->sqe = &req->io->sqe;
+ if (req->opcode == IORING_OP_READ_FIXED ||
+ req->opcode == IORING_OP_WRITE_FIXED)
return 0;
- }
+ if (!req->io && io_alloc_async_ctx(req))
+ return -ENOMEM;
- return -ENOMEM;
+ io_req_map_rw(req, io_size, iovec, fast_iov, iter);
+ req->work.func = io_rw_async;
+ return 0;
}
-static int io_read_prep(struct io_kiocb *req, struct iovec **iovec,
- struct iov_iter *iter, bool force_nonblock)
+static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
+ bool force_nonblock)
{
+ struct io_async_ctx *io;
+ struct iov_iter iter;
ssize_t ret;
- ret = io_prep_rw(req, force_nonblock);
+ ret = io_prep_rw(req, sqe, force_nonblock);
if (ret)
return ret;
if (unlikely(!(req->file->f_mode & FMODE_READ)))
return -EBADF;
- return io_import_iovec(READ, req, iovec, iter);
+ if (!req->io)
+ return 0;
+
+ io = req->io;
+ io->rw.iov = io->rw.fast_iov;
+ req->io = NULL;
+ ret = io_import_iovec(READ, req, &io->rw.iov, &iter);
+ req->io = io;
+ if (ret < 0)
+ return ret;
+
+ io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter);
+ return 0;
}
static int io_read(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
- struct kiocb *kiocb = &req->rw;
+ struct kiocb *kiocb = &req->rw.kiocb;
struct iov_iter iter;
- struct file *file;
size_t iov_count;
ssize_t io_size, ret;
- if (!req->io) {
- ret = io_read_prep(req, &iovec, &iter, force_nonblock);
- if (ret < 0)
- return ret;
- } else {
- ret = io_import_iovec(READ, req, &iovec, &iter);
- if (ret < 0)
- return ret;
- }
+ ret = io_import_iovec(READ, req, &iovec, &iter);
+ if (ret < 0)
+ return ret;
- file = req->file;
+ /* Ensure we clear previously set non-block flag */
+ if (!force_nonblock)
+ req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT;
+
+ req->result = 0;
io_size = ret;
if (req->flags & REQ_F_LINK)
req->result = io_size;
@@ -1774,39 +1852,27 @@ static int io_read(struct io_kiocb *req, struct io_kiocb **nxt,
* If the file doesn't support async, mark it as REQ_F_MUST_PUNT so
* we know to async punt it even if it was opened O_NONBLOCK
*/
- if (force_nonblock && !io_file_supports_async(file)) {
+ if (force_nonblock && !io_file_supports_async(req->file)) {
req->flags |= REQ_F_MUST_PUNT;
goto copy_iov;
}
iov_count = iov_iter_count(&iter);
- ret = rw_verify_area(READ, file, &kiocb->ki_pos, iov_count);
+ ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count);
if (!ret) {
ssize_t ret2;
- if (file->f_op->read_iter)
- ret2 = call_read_iter(file, kiocb, &iter);
+ if (req->file->f_op->read_iter)
+ ret2 = call_read_iter(req->file, kiocb, &iter);
else
- ret2 = loop_rw_iter(READ, file, kiocb, &iter);
+ ret2 = loop_rw_iter(READ, req->file, kiocb, &iter);
- /*
- * In case of a short read, punt to async. This can happen
- * if we have data partially cached. Alternatively we can
- * return the short read, in which case the application will
- * need to issue another SQE and wait for it. That SQE will
- * need async punt anyway, so it's more efficient to do it
- * here.
- */
- if (force_nonblock && !(req->flags & REQ_F_NOWAIT) &&
- (req->flags & REQ_F_ISREG) &&
- ret2 > 0 && ret2 < io_size)
- ret2 = -EAGAIN;
/* Catch -EAGAIN return for forced non-blocking submission */
if (!force_nonblock || ret2 != -EAGAIN) {
kiocb_done(kiocb, ret2, nxt, req->in_async);
} else {
copy_iov:
- ret = io_setup_async_io(req, io_size, iovec,
+ ret = io_setup_async_rw(req, io_size, iovec,
inline_vecs, &iter);
if (ret)
goto out_free;
@@ -1814,46 +1880,58 @@ copy_iov:
}
}
out_free:
- kfree(iovec);
+ if (!io_wq_current_is_worker())
+ kfree(iovec);
return ret;
}
-static int io_write_prep(struct io_kiocb *req, struct iovec **iovec,
- struct iov_iter *iter, bool force_nonblock)
+static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
+ bool force_nonblock)
{
+ struct io_async_ctx *io;
+ struct iov_iter iter;
ssize_t ret;
- ret = io_prep_rw(req, force_nonblock);
+ ret = io_prep_rw(req, sqe, force_nonblock);
if (ret)
return ret;
if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
return -EBADF;
- return io_import_iovec(WRITE, req, iovec, iter);
+ if (!req->io)
+ return 0;
+
+ io = req->io;
+ io->rw.iov = io->rw.fast_iov;
+ req->io = NULL;
+ ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter);
+ req->io = io;
+ if (ret < 0)
+ return ret;
+
+ io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter);
+ return 0;
}
static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
- struct kiocb *kiocb = &req->rw;
+ struct kiocb *kiocb = &req->rw.kiocb;
struct iov_iter iter;
- struct file *file;
size_t iov_count;
ssize_t ret, io_size;
- if (!req->io) {
- ret = io_write_prep(req, &iovec, &iter, force_nonblock);
- if (ret < 0)
- return ret;
- } else {
- ret = io_import_iovec(WRITE, req, &iovec, &iter);
- if (ret < 0)
- return ret;
- }
+ ret = io_import_iovec(WRITE, req, &iovec, &iter);
+ if (ret < 0)
+ return ret;
- file = kiocb->ki_filp;
+ /* Ensure we clear previously set non-block flag */
+ if (!force_nonblock)
+ req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT;
+
+ req->result = 0;
io_size = ret;
if (req->flags & REQ_F_LINK)
req->result = io_size;
@@ -1873,7 +1951,7 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
goto copy_iov;
iov_count = iov_iter_count(&iter);
- ret = rw_verify_area(WRITE, file, &kiocb->ki_pos, iov_count);
+ ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count);
if (!ret) {
ssize_t ret2;
@@ -1885,22 +1963,22 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
* we return to userspace.
*/
if (req->flags & REQ_F_ISREG) {
- __sb_start_write(file_inode(file)->i_sb,
+ __sb_start_write(file_inode(req->file)->i_sb,
SB_FREEZE_WRITE, true);
- __sb_writers_release(file_inode(file)->i_sb,
+ __sb_writers_release(file_inode(req->file)->i_sb,
SB_FREEZE_WRITE);
}
kiocb->ki_flags |= IOCB_WRITE;
- if (file->f_op->write_iter)
- ret2 = call_write_iter(file, kiocb, &iter);
+ if (req->file->f_op->write_iter)
+ ret2 = call_write_iter(req->file, kiocb, &iter);
else
- ret2 = loop_rw_iter(WRITE, file, kiocb, &iter);
+ ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter);
if (!force_nonblock || ret2 != -EAGAIN) {
kiocb_done(kiocb, ret2, nxt, req->in_async);
} else {
copy_iov:
- ret = io_setup_async_io(req, io_size, iovec,
+ ret = io_setup_async_rw(req, io_size, iovec,
inline_vecs, &iter);
if (ret)
goto out_free;
@@ -1908,7 +1986,8 @@ copy_iov:
}
}
out_free:
- kfree(iovec);
+ if (!io_wq_current_is_worker())
+ kfree(iovec);
return ret;
}
@@ -1939,45 +2018,92 @@ static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index))
return -EINVAL;
+ req->sync.flags = READ_ONCE(sqe->fsync_flags);
+ if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC))
+ return -EINVAL;
+
+ req->sync.off = READ_ONCE(sqe->off);
+ req->sync.len = READ_ONCE(sqe->len);
return 0;
}
-static int io_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt, bool force_nonblock)
+static bool io_req_cancelled(struct io_kiocb *req)
{
- loff_t sqe_off = READ_ONCE(sqe->off);
- loff_t sqe_len = READ_ONCE(sqe->len);
- loff_t end = sqe_off + sqe_len;
- unsigned fsync_flags;
- int ret;
+ if (req->work.flags & IO_WQ_WORK_CANCEL) {
+ req_set_fail_links(req);
+ io_cqring_add_event(req, -ECANCELED);
+ io_put_req(req);
+ return true;
+ }
- fsync_flags = READ_ONCE(sqe->fsync_flags);
- if (unlikely(fsync_flags & ~IORING_FSYNC_DATASYNC))
- return -EINVAL;
+ return false;
+}
- ret = io_prep_fsync(req, sqe);
- if (ret)
- return ret;
+static void io_link_work_cb(struct io_wq_work **workptr)
+{
+ struct io_wq_work *work = *workptr;
+ struct io_kiocb *link = work->data;
- /* fsync always requires a blocking context */
- if (force_nonblock)
- return -EAGAIN;
+ io_queue_linked_timeout(link);
+ work->func = io_wq_submit_work;
+}
- ret = vfs_fsync_range(req->rw.ki_filp, sqe_off,
- end > 0 ? end : LLONG_MAX,
- fsync_flags & IORING_FSYNC_DATASYNC);
+static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
+{
+ struct io_kiocb *link;
+
+ io_prep_async_work(nxt, &link);
+ *workptr = &nxt->work;
+ if (link) {
+ nxt->work.flags |= IO_WQ_WORK_CB;
+ nxt->work.func = io_link_work_cb;
+ nxt->work.data = link;
+ }
+}
+
+static void io_fsync_finish(struct io_wq_work **workptr)
+{
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ loff_t end = req->sync.off + req->sync.len;
+ struct io_kiocb *nxt = NULL;
+ int ret;
+
+ if (io_req_cancelled(req))
+ return;
+ ret = vfs_fsync_range(req->file, req->sync.off,
+ end > 0 ? end : LLONG_MAX,
+ req->sync.flags & IORING_FSYNC_DATASYNC);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
- io_put_req_find_next(req, nxt);
+ io_put_req_find_next(req, &nxt);
+ if (nxt)
+ io_wq_assign_next(workptr, nxt);
+}
+
+static int io_fsync(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct io_wq_work *work, *old_work;
+
+ /* fsync always requires a blocking context */
+ if (force_nonblock) {
+ io_put_req(req);
+ req->work.func = io_fsync_finish;
+ return -EAGAIN;
+ }
+
+ work = old_work = &req->work;
+ io_fsync_finish(&work);
+ if (work && work != old_work)
+ *nxt = container_of(work, struct io_kiocb, work);
return 0;
}
static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
- int ret = 0;
if (!req->file)
return -EBADF;
@@ -1987,60 +2113,88 @@ static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index))
return -EINVAL;
- return ret;
+ 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 int io_sync_file_range(struct io_kiocb *req,
- const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt,
- bool force_nonblock)
+static void io_sync_file_range_finish(struct io_wq_work **workptr)
{
- loff_t sqe_off;
- loff_t sqe_len;
- unsigned flags;
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ struct io_kiocb *nxt = NULL;
int ret;
- ret = io_prep_sfr(req, sqe);
- if (ret)
- return 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)
+ if (force_nonblock) {
+ io_put_req(req);
+ req->work.func = io_sync_file_range_finish;
return -EAGAIN;
+ }
- sqe_off = READ_ONCE(sqe->off);
- sqe_len = READ_ONCE(sqe->len);
- flags = READ_ONCE(sqe->sync_range_flags);
+ 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;
+}
- ret = sync_file_range(req->rw.ki_filp, sqe_off, sqe_len, flags);
+#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 (ret < 0)
- req_set_fail_links(req);
- io_cqring_add_event(req, ret);
- io_put_req_find_next(req, nxt);
- return 0;
+ 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, struct io_async_ctx *io)
+static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
- const struct io_uring_sqe *sqe = req->sqe;
- struct user_msghdr __user *msg;
- unsigned flags;
+ 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));
+
+ if (!io)
+ return 0;
- flags = READ_ONCE(sqe->msg_flags);
- msg = (struct user_msghdr __user *)(unsigned long) READ_ONCE(sqe->addr);
io->msg.iov = io->msg.fast_iov;
- return sendmsg_copy_msghdr(&io->msg.msg, msg, flags, &io->msg.iov);
+ return sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags,
+ &io->msg.iov);
#else
- return 0;
+ return -EOPNOTSUPP;
#endif
}
-static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt, bool force_nonblock)
+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;
@@ -2049,46 +2203,52 @@ static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
sock = sock_from_file(req->file, &ret);
if (sock) {
- struct io_async_ctx io, *copy;
+ struct io_async_ctx io;
struct sockaddr_storage addr;
- struct msghdr *kmsg;
unsigned flags;
- flags = READ_ONCE(sqe->msg_flags);
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
- flags |= MSG_DONTWAIT;
-
if (req->io) {
- kmsg = &req->io->msg.msg;
- kmsg->msg_name = &addr;
+ 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 {
- kmsg = &io.msg.msg;
- kmsg->msg_name = &addr;
- ret = io_sendmsg_prep(req, &io);
+ 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)
- goto out;
+ return ret;
}
- ret = __sys_sendmsg_sock(sock, kmsg, flags);
+ 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) {
- copy = kmalloc(sizeof(*copy), GFP_KERNEL);
- if (!copy) {
- ret = -ENOMEM;
- goto out;
- }
- memcpy(&copy->msg, &io.msg, sizeof(copy->msg));
- req->io = copy;
- memcpy(&req->io->sqe, req->sqe, sizeof(*req->sqe));
- req->sqe = &req->io->sqe;
- return ret;
+ if (req->io)
+ return -EAGAIN;
+ if (io_alloc_async_ctx(req))
+ return -ENOMEM;
+ memcpy(&req->io->msg, &io.msg, sizeof(io.msg));
+ req->work.func = io_sendrecv_async;
+ return -EAGAIN;
}
if (ret == -ERESTARTSYS)
ret = -EINTR;
}
-out:
+ if (!io_wq_current_is_worker() && kmsg && kmsg->iov != kmsg->fast_iov)
+ kfree(kmsg->iov);
io_cqring_add_event(req, ret);
if (ret < 0)
req_set_fail_links(req);
@@ -2099,27 +2259,32 @@ out:
#endif
}
-static int io_recvmsg_prep(struct io_kiocb *req, struct io_async_ctx *io)
+static int io_recvmsg_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
- const struct io_uring_sqe *sqe = req->sqe;
- struct user_msghdr __user *msg;
- unsigned flags;
+ 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));
+
+ if (!io)
+ return 0;
- flags = READ_ONCE(sqe->msg_flags);
- msg = (struct user_msghdr __user *)(unsigned long) READ_ONCE(sqe->addr);
io->msg.iov = io->msg.fast_iov;
- return recvmsg_copy_msghdr(&io->msg.msg, msg, flags, &io->msg.uaddr,
- &io->msg.iov);
+ return recvmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags,
+ &io->msg.uaddr, &io->msg.iov);
#else
- return 0;
+ return -EOPNOTSUPP;
#endif
}
-static int io_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt, bool force_nonblock)
+static int io_recvmsg(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;
@@ -2128,49 +2293,54 @@ static int io_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
sock = sock_from_file(req->file, &ret);
if (sock) {
- struct user_msghdr __user *msg;
- struct io_async_ctx io, *copy;
+ struct io_async_ctx io;
struct sockaddr_storage addr;
- struct msghdr *kmsg;
unsigned flags;
- flags = READ_ONCE(sqe->msg_flags);
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
- flags |= MSG_DONTWAIT;
-
- msg = (struct user_msghdr __user *) (unsigned long)
- READ_ONCE(sqe->addr);
if (req->io) {
- kmsg = &req->io->msg.msg;
- kmsg->msg_name = &addr;
+ 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 {
- kmsg = &io.msg.msg;
- kmsg->msg_name = &addr;
- ret = io_recvmsg_prep(req, &io);
+ struct io_sr_msg *sr = &req->sr_msg;
+
+ kmsg = &io.msg;
+ kmsg->msg.msg_name = &addr;
+
+ io.msg.iov = io.msg.fast_iov;
+ ret = recvmsg_copy_msghdr(&io.msg.msg, sr->msg,
+ sr->msg_flags, &io.msg.uaddr,
+ &io.msg.iov);
if (ret)
- goto out;
+ return ret;
}
- ret = __sys_recvmsg_sock(sock, kmsg, msg, io.msg.uaddr, flags);
+ 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, &kmsg->msg, req->sr_msg.msg,
+ kmsg->uaddr, flags);
if (force_nonblock && ret == -EAGAIN) {
- copy = kmalloc(sizeof(*copy), GFP_KERNEL);
- if (!copy) {
- ret = -ENOMEM;
- goto out;
- }
- memcpy(copy, &io, sizeof(*copy));
- req->io = copy;
- memcpy(&req->io->sqe, req->sqe, sizeof(*req->sqe));
- req->sqe = &req->io->sqe;
- return ret;
+ if (req->io)
+ return -EAGAIN;
+ if (io_alloc_async_ctx(req))
+ return -ENOMEM;
+ memcpy(&req->io->msg, &io.msg, sizeof(io.msg));
+ req->work.func = io_sendrecv_async;
+ return -EAGAIN;
}
if (ret == -ERESTARTSYS)
ret = -EINTR;
}
-out:
+ if (!io_wq_current_is_worker() && kmsg && kmsg->iov != kmsg->fast_iov)
+ kfree(kmsg->iov);
io_cqring_add_event(req, ret);
if (ret < 0)
req_set_fail_links(req);
@@ -2181,30 +2351,38 @@ out:
#endif
}
-static int io_accept(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt, bool force_nonblock)
+static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
- struct sockaddr __user *addr;
- int __user *addr_len;
- unsigned file_flags;
- int flags, ret;
+ struct io_accept *accept = &req->accept;
if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
return -EINVAL;
if (sqe->ioprio || sqe->len || sqe->buf_index)
return -EINVAL;
- addr = (struct sockaddr __user *) (unsigned long) READ_ONCE(sqe->addr);
- addr_len = (int __user *) (unsigned long) READ_ONCE(sqe->addr2);
- flags = READ_ONCE(sqe->accept_flags);
- file_flags = force_nonblock ? O_NONBLOCK : 0;
+ accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ accept->flags = READ_ONCE(sqe->accept_flags);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
- ret = __sys_accept4_file(req->file, file_flags, addr, addr_len, flags);
- if (ret == -EAGAIN && force_nonblock) {
- req->work.flags |= IO_WQ_WORK_NEEDS_FILES;
+#if defined(CONFIG_NET)
+static int __io_accept(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+ struct io_accept *accept = &req->accept;
+ unsigned file_flags;
+ int ret;
+
+ file_flags = force_nonblock ? O_NONBLOCK : 0;
+ ret = __sys_accept4_file(req->file, file_flags, accept->addr,
+ accept->addr_len, accept->flags);
+ if (ret == -EAGAIN && force_nonblock)
return -EAGAIN;
- }
if (ret == -ERESTARTSYS)
ret = -EINTR;
if (ret < 0)
@@ -2212,63 +2390,95 @@ static int io_accept(struct io_kiocb *req, const struct io_uring_sqe *sqe,
io_cqring_add_event(req, ret);
io_put_req_find_next(req, nxt);
return 0;
-#else
- return -EOPNOTSUPP;
-#endif
}
-static int io_connect_prep(struct io_kiocb *req, struct io_async_ctx *io)
+static void io_accept_finish(struct io_wq_work **workptr)
+{
+ struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
+ struct io_kiocb *nxt = NULL;
+
+ if (io_req_cancelled(req))
+ return;
+ __io_accept(req, &nxt, false);
+ if (nxt)
+ io_wq_assign_next(workptr, nxt);
+}
+#endif
+
+static int io_accept(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
{
#if defined(CONFIG_NET)
- const struct io_uring_sqe *sqe = req->sqe;
- struct sockaddr __user *addr;
- int addr_len;
+ int ret;
- addr = (struct sockaddr __user *) (unsigned long) READ_ONCE(sqe->addr);
- addr_len = READ_ONCE(sqe->addr2);
- return move_addr_to_kernel(addr, addr_len, &io->connect.address);
-#else
+ 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;
+ }
return 0;
+#else
+ return -EOPNOTSUPP;
#endif
}
-static int io_connect(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt, bool force_nonblock)
+static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
- struct io_async_ctx __io, *io;
- unsigned file_flags;
- int addr_len, ret;
+ struct io_connect *conn = &req->connect;
+ struct io_async_ctx *io = req->io;
if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
return -EINVAL;
if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags)
return -EINVAL;
- addr_len = READ_ONCE(sqe->addr2);
- file_flags = force_nonblock ? O_NONBLOCK : 0;
+ conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ conn->addr_len = READ_ONCE(sqe->addr2);
+
+ if (!io)
+ return 0;
+
+ return move_addr_to_kernel(conn->addr, conn->addr_len,
+ &io->connect.address);
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+static int io_connect(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
+{
+#if defined(CONFIG_NET)
+ struct io_async_ctx __io, *io;
+ unsigned file_flags;
+ int ret;
if (req->io) {
io = req->io;
} else {
- ret = io_connect_prep(req, &__io);
+ ret = move_addr_to_kernel(req->connect.addr,
+ req->connect.addr_len,
+ &__io.connect.address);
if (ret)
goto out;
io = &__io;
}
- ret = __sys_connect_file(req->file, &io->connect.address, addr_len,
- file_flags);
+ file_flags = force_nonblock ? O_NONBLOCK : 0;
+
+ ret = __sys_connect_file(req->file, &io->connect.address,
+ req->connect.addr_len, file_flags);
if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
- io = kmalloc(sizeof(*io), GFP_KERNEL);
- if (!io) {
+ if (req->io)
+ return -EAGAIN;
+ if (io_alloc_async_ctx(req)) {
ret = -ENOMEM;
goto out;
}
- memcpy(&io->connect, &__io.connect, sizeof(io->connect));
- req->io = io;
- memcpy(&io->sqe, req->sqe, sizeof(*req->sqe));
- req->sqe = &io->sqe;
+ memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect));
return -EAGAIN;
}
if (ret == -ERESTARTSYS)
@@ -2331,23 +2541,32 @@ static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
return -ENOENT;
}
+static int io_poll_remove_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index ||
+ sqe->poll_events)
+ return -EINVAL;
+
+ req->poll.addr = READ_ONCE(sqe->addr);
+ return 0;
+}
+
/*
* Find a running poll command that matches one specified in sqe->addr,
* and remove it if found.
*/
-static int io_poll_remove(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static int io_poll_remove(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
+ u64 addr;
int ret;
- if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
- return -EINVAL;
- if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index ||
- sqe->poll_events)
- return -EINVAL;
-
+ addr = req->poll.addr;
spin_lock_irq(&ctx->completion_lock);
- ret = io_poll_cancel(ctx, READ_ONCE(sqe->addr));
+ ret = io_poll_cancel(ctx, addr);
spin_unlock_irq(&ctx->completion_lock);
io_cqring_add_event(req, ret);
@@ -2413,7 +2632,7 @@ static void io_poll_complete_work(struct io_wq_work **workptr)
req_set_fail_links(req);
io_put_req_find_next(req, &nxt);
if (nxt)
- *workptr = &nxt->work;
+ io_wq_assign_next(workptr, nxt);
}
static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
@@ -2482,14 +2701,9 @@ static void io_poll_req_insert(struct io_kiocb *req)
hlist_add_head(&req->hash_node, list);
}
-static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt)
+static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_poll_iocb *poll = &req->poll;
- struct io_ring_ctx *ctx = req->ctx;
- struct io_poll_table ipt;
- bool cancel = false;
- __poll_t mask;
u16 events;
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
@@ -2499,10 +2713,20 @@ static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe,
if (!poll->file)
return -EBADF;
- req->io = NULL;
- INIT_IO_WORK(&req->work, io_poll_complete_work);
events = READ_ONCE(sqe->poll_events);
poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP;
+ return 0;
+}
+
+static int io_poll_add(struct io_kiocb *req, struct io_kiocb **nxt)
+{
+ struct io_poll_iocb *poll = &req->poll;
+ struct io_ring_ctx *ctx = req->ctx;
+ struct io_poll_table ipt;
+ bool cancel = false;
+ __poll_t mask;
+
+ INIT_IO_WORK(&req->work, io_poll_complete_work);
INIT_HLIST_NODE(&req->hash_node);
poll->head = NULL;
@@ -2573,7 +2797,7 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
/*
* Adjust the reqs sequence before the current one because it
- * will consume a slot in the cq_ring and the the cq_tail
+ * will consume a slot in the cq_ring and the cq_tail
* pointer will be increased, otherwise other timeout reqs may
* return in advance without waiting for enough wait_nr.
*/
@@ -2619,26 +2843,32 @@ static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
return 0;
}
+static int io_timeout_remove_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len)
+ return -EINVAL;
+
+ req->timeout.addr = READ_ONCE(sqe->addr);
+ req->timeout.flags = READ_ONCE(sqe->timeout_flags);
+ if (req->timeout.flags)
+ return -EINVAL;
+
+ return 0;
+}
+
/*
* Remove or update an existing timeout command
*/
-static int io_timeout_remove(struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static int io_timeout_remove(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
- unsigned flags;
int ret;
- if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
- return -EINVAL;
- if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len)
- return -EINVAL;
- flags = READ_ONCE(sqe->timeout_flags);
- if (flags)
- return -EINVAL;
-
spin_lock_irq(&ctx->completion_lock);
- ret = io_timeout_cancel(ctx, READ_ONCE(sqe->addr));
+ ret = io_timeout_cancel(ctx, req->timeout.addr);
io_cqring_fill_event(req, ret);
io_commit_cqring(ctx);
@@ -2650,10 +2880,9 @@ static int io_timeout_remove(struct io_kiocb *req,
return 0;
}
-static int io_timeout_prep(struct io_kiocb *req, struct io_async_ctx *io,
+static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
bool is_timeout_link)
{
- const struct io_uring_sqe *sqe = req->sqe;
struct io_timeout_data *data;
unsigned flags;
@@ -2667,7 +2896,12 @@ static int io_timeout_prep(struct io_kiocb *req, struct io_async_ctx *io,
if (flags & ~IORING_TIMEOUT_ABS)
return -EINVAL;
- data = &io->timeout;
+ req->timeout.count = READ_ONCE(sqe->off);
+
+ if (!req->io && io_alloc_async_ctx(req))
+ return -ENOMEM;
+
+ data = &req->io->timeout;
data->req = req;
req->flags |= REQ_F_TIMEOUT;
@@ -2680,32 +2914,17 @@ static int io_timeout_prep(struct io_kiocb *req, struct io_async_ctx *io,
data->mode = HRTIMER_MODE_REL;
hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode);
- req->io = io;
return 0;
}
-static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static int io_timeout(struct io_kiocb *req)
{
unsigned count;
struct io_ring_ctx *ctx = req->ctx;
struct io_timeout_data *data;
- struct io_async_ctx *io;
struct list_head *entry;
unsigned span = 0;
- io = req->io;
- if (!io) {
- int ret;
-
- io = kmalloc(sizeof(*io), GFP_KERNEL);
- if (!io)
- return -ENOMEM;
- ret = io_timeout_prep(req, io, false);
- if (ret) {
- kfree(io);
- return ret;
- }
- }
data = &req->io->timeout;
/*
@@ -2713,7 +2932,7 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
* timeout event to be satisfied. If it isn't set, then this is
* a pure timeout request, sequence isn't used.
*/
- count = READ_ONCE(sqe->off);
+ count = req->timeout.count;
if (!count) {
req->flags |= REQ_F_TIMEOUT_NOSEQ;
spin_lock_irq(&ctx->completion_lock);
@@ -2831,84 +3050,104 @@ done:
io_put_req_find_next(req, nxt);
}
-static int io_async_cancel(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **nxt)
+static int io_async_cancel_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
{
- struct io_ring_ctx *ctx = req->ctx;
-
- if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->flags || sqe->ioprio || sqe->off || sqe->len ||
sqe->cancel_flags)
return -EINVAL;
- io_async_find_and_cancel(ctx, req, READ_ONCE(sqe->addr), nxt, 0);
+ req->cancel.addr = READ_ONCE(sqe->addr);
return 0;
}
-static int io_req_defer_prep(struct io_kiocb *req, struct io_async_ctx *io)
+static int io_async_cancel(struct io_kiocb *req, struct io_kiocb **nxt)
{
- struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
- struct iov_iter iter;
- ssize_t ret;
+ struct io_ring_ctx *ctx = req->ctx;
- memcpy(&io->sqe, req->sqe, sizeof(io->sqe));
- req->sqe = &io->sqe;
+ io_async_find_and_cancel(ctx, req, req->cancel.addr, nxt, 0);
+ return 0;
+}
+
+static int io_req_defer_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ ssize_t ret = 0;
- switch (io->sqe.opcode) {
+ switch (req->opcode) {
+ case IORING_OP_NOP:
+ break;
case IORING_OP_READV:
case IORING_OP_READ_FIXED:
- ret = io_read_prep(req, &iovec, &iter, true);
+ ret = io_read_prep(req, sqe, true);
break;
case IORING_OP_WRITEV:
case IORING_OP_WRITE_FIXED:
- ret = io_write_prep(req, &iovec, &iter, true);
+ ret = io_write_prep(req, sqe, true);
+ break;
+ case IORING_OP_POLL_ADD:
+ ret = io_poll_add_prep(req, sqe);
+ break;
+ case IORING_OP_POLL_REMOVE:
+ ret = io_poll_remove_prep(req, sqe);
+ break;
+ case IORING_OP_FSYNC:
+ ret = io_prep_fsync(req, sqe);
+ break;
+ case IORING_OP_SYNC_FILE_RANGE:
+ ret = io_prep_sfr(req, sqe);
break;
case IORING_OP_SENDMSG:
- ret = io_sendmsg_prep(req, io);
+ ret = io_sendmsg_prep(req, sqe);
break;
case IORING_OP_RECVMSG:
- ret = io_recvmsg_prep(req, io);
+ ret = io_recvmsg_prep(req, sqe);
break;
case IORING_OP_CONNECT:
- ret = io_connect_prep(req, io);
+ ret = io_connect_prep(req, sqe);
break;
case IORING_OP_TIMEOUT:
- return io_timeout_prep(req, io, false);
+ ret = io_timeout_prep(req, sqe, false);
+ break;
+ case IORING_OP_TIMEOUT_REMOVE:
+ ret = io_timeout_remove_prep(req, sqe);
+ break;
+ case IORING_OP_ASYNC_CANCEL:
+ ret = io_async_cancel_prep(req, sqe);
+ break;
case IORING_OP_LINK_TIMEOUT:
- return io_timeout_prep(req, io, true);
+ ret = io_timeout_prep(req, sqe, true);
+ break;
+ case IORING_OP_ACCEPT:
+ ret = io_accept_prep(req, sqe);
+ break;
default:
- req->io = io;
- return 0;
+ printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
+ req->opcode);
+ ret = -EINVAL;
+ break;
}
- if (ret < 0)
- return ret;
-
- req->io = io;
- io_req_map_io(req, ret, iovec, inline_vecs, &iter);
- return 0;
+ return ret;
}
-static int io_req_defer(struct io_kiocb *req)
+static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
- struct io_async_ctx *io;
int ret;
/* Still need defer if there is pending req in defer list. */
if (!req_need_defer(req) && list_empty(&ctx->defer_list))
return 0;
- io = kmalloc(sizeof(*io), GFP_KERNEL);
- if (!io)
+ if (!req->io && io_alloc_async_ctx(req))
return -EAGAIN;
- ret = io_req_defer_prep(req, io);
- if (ret < 0) {
- kfree(io);
+ ret = io_req_defer_prep(req, sqe);
+ if (ret < 0)
return ret;
- }
spin_lock_irq(&ctx->completion_lock);
if (!req_need_defer(req) && list_empty(&ctx->defer_list)) {
@@ -2922,66 +3161,121 @@ static int io_req_defer(struct io_kiocb *req)
return -EIOCBQUEUED;
}
-__attribute__((nonnull))
-static int io_issue_sqe(struct io_kiocb *req, struct io_kiocb **nxt,
- bool force_nonblock)
+static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
+ struct io_kiocb **nxt, bool force_nonblock)
{
- int ret, opcode;
struct io_ring_ctx *ctx = req->ctx;
+ int ret;
- opcode = READ_ONCE(req->sqe->opcode);
- switch (opcode) {
+ switch (req->opcode) {
case IORING_OP_NOP:
ret = io_nop(req);
break;
case IORING_OP_READV:
- if (unlikely(req->sqe->buf_index))
- return -EINVAL;
- ret = io_read(req, nxt, force_nonblock);
- break;
- case IORING_OP_WRITEV:
- if (unlikely(req->sqe->buf_index))
- return -EINVAL;
- ret = io_write(req, nxt, force_nonblock);
- break;
case IORING_OP_READ_FIXED:
+ if (sqe) {
+ ret = io_read_prep(req, sqe, force_nonblock);
+ if (ret < 0)
+ break;
+ }
ret = io_read(req, nxt, force_nonblock);
break;
+ case IORING_OP_WRITEV:
case IORING_OP_WRITE_FIXED:
+ if (sqe) {
+ ret = io_write_prep(req, sqe, force_nonblock);
+ if (ret < 0)
+ break;
+ }
ret = io_write(req, nxt, force_nonblock);
break;
case IORING_OP_FSYNC:
- ret = io_fsync(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_prep_fsync(req, sqe);
+ if (ret < 0)
+ break;
+ }
+ ret = io_fsync(req, nxt, force_nonblock);
break;
case IORING_OP_POLL_ADD:
- ret = io_poll_add(req, req->sqe, nxt);
+ if (sqe) {
+ ret = io_poll_add_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_poll_add(req, nxt);
break;
case IORING_OP_POLL_REMOVE:
- ret = io_poll_remove(req, req->sqe);
+ if (sqe) {
+ ret = io_poll_remove_prep(req, sqe);
+ if (ret < 0)
+ break;
+ }
+ ret = io_poll_remove(req);
break;
case IORING_OP_SYNC_FILE_RANGE:
- ret = io_sync_file_range(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_prep_sfr(req, sqe);
+ if (ret < 0)
+ break;
+ }
+ ret = io_sync_file_range(req, nxt, force_nonblock);
break;
case IORING_OP_SENDMSG:
- ret = io_sendmsg(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_sendmsg_prep(req, sqe);
+ if (ret < 0)
+ break;
+ }
+ ret = io_sendmsg(req, nxt, force_nonblock);
break;
case IORING_OP_RECVMSG:
- ret = io_recvmsg(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_recvmsg_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_recvmsg(req, nxt, force_nonblock);
break;
case IORING_OP_TIMEOUT:
- ret = io_timeout(req, req->sqe);
+ if (sqe) {
+ ret = io_timeout_prep(req, sqe, false);
+ if (ret)
+ break;
+ }
+ ret = io_timeout(req);
break;
case IORING_OP_TIMEOUT_REMOVE:
- ret = io_timeout_remove(req, req->sqe);
+ if (sqe) {
+ ret = io_timeout_remove_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_timeout_remove(req);
break;
case IORING_OP_ACCEPT:
- ret = io_accept(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_accept_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_accept(req, nxt, force_nonblock);
break;
case IORING_OP_CONNECT:
- ret = io_connect(req, req->sqe, nxt, force_nonblock);
+ if (sqe) {
+ ret = io_connect_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_connect(req, nxt, force_nonblock);
break;
case IORING_OP_ASYNC_CANCEL:
- ret = io_async_cancel(req, req->sqe, nxt);
+ if (sqe) {
+ ret = io_async_cancel_prep(req, sqe);
+ if (ret)
+ break;
+ }
+ ret = io_async_cancel(req, nxt);
break;
default:
ret = -EINVAL;
@@ -2992,24 +3286,24 @@ static int io_issue_sqe(struct io_kiocb *req, struct io_kiocb **nxt,
return ret;
if (ctx->flags & IORING_SETUP_IOPOLL) {
+ const bool in_async = io_wq_current_is_worker();
+
if (req->result == -EAGAIN)
return -EAGAIN;
+ /* workqueue context doesn't hold uring_lock, grab it now */
+ if (in_async)
+ mutex_lock(&ctx->uring_lock);
+
io_iopoll_req_issued(req);
+
+ if (in_async)
+ mutex_unlock(&ctx->uring_lock);
}
return 0;
}
-static void io_link_work_cb(struct io_wq_work **workptr)
-{
- struct io_wq_work *work = *workptr;
- struct io_kiocb *link = work->data;
-
- io_queue_linked_timeout(link);
- work->func = io_wq_submit_work;
-}
-
static void io_wq_submit_work(struct io_wq_work **workptr)
{
struct io_wq_work *work = *workptr;
@@ -3017,9 +3311,6 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
struct io_kiocb *nxt = NULL;
int ret = 0;
- /* Ensure we clear previously set non-block flag */
- req->rw.ki_flags &= ~IOCB_NOWAIT;
-
if (work->flags & IO_WQ_WORK_CANCEL)
ret = -ECANCELED;
@@ -3027,7 +3318,7 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
req->has_user = (work->flags & IO_WQ_WORK_HAS_MM) != 0;
req->in_async = true;
do {
- ret = io_issue_sqe(req, &nxt, false);
+ ret = io_issue_sqe(req, NULL, &nxt, false);
/*
* We can get EAGAIN for polled IO even though we're
* forcing a sync submission from here, since we can't
@@ -3049,17 +3340,8 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
}
/* if a dependent link is ready, pass it back */
- if (!ret && nxt) {
- struct io_kiocb *link;
-
- io_prep_async_work(nxt, &link);
- *workptr = &nxt->work;
- if (link) {
- nxt->work.flags |= IO_WQ_WORK_CB;
- nxt->work.func = io_link_work_cb;
- nxt->work.data = link;
- }
- }
+ if (!ret && nxt)
+ io_wq_assign_next(workptr, nxt);
}
static bool io_req_op_valid(int op)
@@ -3067,11 +3349,9 @@ static bool io_req_op_valid(int op)
return op >= IORING_OP_NOP && op < IORING_OP_LAST;
}
-static int io_op_needs_file(const struct io_uring_sqe *sqe)
+static int io_req_needs_file(struct io_kiocb *req)
{
- int op = READ_ONCE(sqe->opcode);
-
- switch (op) {
+ switch (req->opcode) {
case IORING_OP_NOP:
case IORING_OP_POLL_REMOVE:
case IORING_OP_TIMEOUT:
@@ -3080,7 +3360,7 @@ static int io_op_needs_file(const struct io_uring_sqe *sqe)
case IORING_OP_LINK_TIMEOUT:
return 0;
default:
- if (io_req_op_valid(op))
+ if (io_req_op_valid(req->opcode))
return 1;
return -EINVAL;
}
@@ -3095,19 +3375,20 @@ static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
return table->files[index & IORING_FILE_TABLE_MASK];
}
-static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req)
+static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
unsigned flags;
int fd, ret;
- flags = READ_ONCE(req->sqe->flags);
- fd = READ_ONCE(req->sqe->fd);
+ flags = READ_ONCE(sqe->flags);
+ fd = READ_ONCE(sqe->fd);
if (flags & IOSQE_IO_DRAIN)
req->flags |= REQ_F_IO_DRAIN;
- ret = io_op_needs_file(req->sqe);
+ ret = io_req_needs_file(req);
if (ret <= 0)
return ret;
@@ -3227,14 +3508,14 @@ static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb,
link_list);
- if (!nxt || nxt->sqe->opcode != IORING_OP_LINK_TIMEOUT)
+ if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT)
return NULL;
req->flags |= REQ_F_LINK_TIMEOUT;
return nxt;
}
-static void __io_queue_sqe(struct io_kiocb *req)
+static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_kiocb *linked_timeout;
struct io_kiocb *nxt = NULL;
@@ -3243,7 +3524,7 @@ static void __io_queue_sqe(struct io_kiocb *req)
again:
linked_timeout = io_prep_linked_timeout(req);
- ret = io_issue_sqe(req, &nxt, true);
+ ret = io_issue_sqe(req, sqe, &nxt, true);
/*
* We async punt it if the file wasn't marked NOWAIT, or if the file
@@ -3290,7 +3571,7 @@ done_req:
}
}
-static void io_queue_sqe(struct io_kiocb *req)
+static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
int ret;
@@ -3300,7 +3581,7 @@ static void io_queue_sqe(struct io_kiocb *req)
}
req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK);
- ret = io_req_defer(req);
+ ret = io_req_defer(req, sqe);
if (ret) {
if (ret != -EIOCBQUEUED) {
io_cqring_add_event(req, ret);
@@ -3308,7 +3589,7 @@ static void io_queue_sqe(struct io_kiocb *req)
io_double_put_req(req);
}
} else
- __io_queue_sqe(req);
+ __io_queue_sqe(req, sqe);
}
static inline void io_queue_link_head(struct io_kiocb *req)
@@ -3317,27 +3598,25 @@ static inline void io_queue_link_head(struct io_kiocb *req)
io_cqring_add_event(req, -ECANCELED);
io_double_put_req(req);
} else
- io_queue_sqe(req);
+ io_queue_sqe(req, NULL);
}
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
IOSQE_IO_HARDLINK)
-static bool io_submit_sqe(struct io_kiocb *req, struct io_submit_state *state,
- struct io_kiocb **link)
+static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
+ struct io_submit_state *state, struct io_kiocb **link)
{
struct io_ring_ctx *ctx = req->ctx;
int ret;
- req->user_data = req->sqe->user_data;
-
/* enforce forwards compatibility on users */
- if (unlikely(req->sqe->flags & ~SQE_VALID_FLAGS)) {
+ if (unlikely(sqe->flags & ~SQE_VALID_FLAGS)) {
ret = -EINVAL;
goto err_req;
}
- ret = io_req_set_file(state, req);
+ ret = io_req_set_file(state, req, sqe);
if (unlikely(ret)) {
err_req:
io_cqring_add_event(req, ret);
@@ -3354,38 +3633,38 @@ err_req:
*/
if (*link) {
struct io_kiocb *prev = *link;
- struct io_async_ctx *io;
- if (req->sqe->flags & IOSQE_IO_DRAIN)
+ if (sqe->flags & IOSQE_IO_DRAIN)
(*link)->flags |= REQ_F_DRAIN_LINK | REQ_F_IO_DRAIN;
- if (req->sqe->flags & IOSQE_IO_HARDLINK)
+ if (sqe->flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
- io = kmalloc(sizeof(*io), GFP_KERNEL);
- if (!io) {
+ if (io_alloc_async_ctx(req)) {
ret = -EAGAIN;
goto err_req;
}
- ret = io_req_defer_prep(req, io);
+ ret = io_req_defer_prep(req, sqe);
if (ret) {
- kfree(io);
/* fail even hard links since we don't submit */
prev->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 (req->sqe->flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
+ } else if (sqe->flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
req->flags |= REQ_F_LINK;
- if (req->sqe->flags & IOSQE_IO_HARDLINK)
+ 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;
} else {
- io_queue_sqe(req);
+ io_queue_sqe(req, sqe);
}
return true;
@@ -3430,14 +3709,15 @@ static void io_commit_sqring(struct io_ring_ctx *ctx)
}
/*
- * Fetch an sqe, if one is available. Note that s->sqe will point to memory
+ * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory
* that is mapped by userspace. This means that care needs to be taken to
* ensure that reads are stable, as we cannot rely on userspace always
* being a good citizen. If members of the sqe are validated and then later
* used, it's important that those reads are done through READ_ONCE() to
* prevent a re-load down the line.
*/
-static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req)
+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;
@@ -3464,7 +3744,9 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req)
* link list.
*/
req->sequence = ctx->cached_sq_head;
- req->sqe = &ctx->sq_sqes[head];
+ *sqe_ptr = &ctx->sq_sqes[head];
+ req->opcode = READ_ONCE((*sqe_ptr)->opcode);
+ req->user_data = READ_ONCE((*sqe_ptr)->user_data);
ctx->cached_sq_head++;
return true;
}
@@ -3496,6 +3778,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
for (i = 0; i < nr; i++) {
+ const struct io_uring_sqe *sqe;
struct io_kiocb *req;
unsigned int sqe_flags;
@@ -3505,12 +3788,12 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
submitted = -EAGAIN;
break;
}
- if (!io_get_sqring(ctx, req)) {
+ if (!io_get_sqring(ctx, req, &sqe)) {
__io_free_req(req);
break;
}
- if (io_sqe_needs_user(req->sqe) && !*mm) {
+ if (io_req_needs_user(req) && !*mm) {
mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
if (!mm_fault) {
use_mm(ctx->sqo_mm);
@@ -3519,22 +3802,21 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
submitted++;
- sqe_flags = req->sqe->flags;
+ 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->sqe->user_data,
- true, async);
- if (!io_submit_sqe(req, statep, &link))
+ trace_io_uring_submit_sqe(ctx, 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) && link) {
+ if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) && link) {
io_queue_link_head(link);
link = NULL;
}
@@ -3694,7 +3976,7 @@ static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush)
struct io_ring_ctx *ctx = iowq->ctx;
/*
- * Wake up if we have enough events, or if a timeout occured since we
+ * Wake up if we have enough events, or if a timeout occurred since we
* started waiting. For timeouts, we always want to return to userspace,
* regardless of event count.
*/
@@ -4446,7 +4728,7 @@ static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst,
if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov)))
return -EFAULT;
- dst->iov_base = (void __user *) (unsigned long) ciov.iov_base;
+ dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base);
dst->iov_len = ciov.iov_len;
return 0;
}
@@ -4877,6 +5159,12 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
} else if (to_submit) {
struct mm_struct *cur_mm;
+ if (current->mm != ctx->sqo_mm ||
+ current_cred() != ctx->creds) {
+ ret = -EPERM;
+ goto out;
+ }
+
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 */
@@ -4884,6 +5172,9 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
submitted = io_submit_sqes(ctx, to_submit, f.file, fd,
&cur_mm, false);
mutex_unlock(&ctx->uring_lock);
+
+ if (submitted != to_submit)
+ goto out;
}
if (flags & IORING_ENTER_GETEVENTS) {
unsigned nr_events = 0;
@@ -4897,6 +5188,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
}
}
+out:
percpu_ref_put(&ctx->refs);
out_fput:
fdput(f);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-05 01:20:42 +0000