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Signed-off-by: Pavel Begunkov --- include/uapi/linux/io_uring/mock_file.h | 4 +- io_uring/mock_file.c | 59 +++++++++++++++++++++++-- 2 files changed, 58 insertions(+), 5 deletions(-) diff --git a/include/uapi/linux/io_uring/mock_file.h b/include/uapi/linux/io_uring/mock_file.h index 125949d2b5ce..c8fa77e39c68 100644 --- a/include/uapi/linux/io_uring/mock_file.h +++ b/include/uapi/linux/io_uring/mock_file.h @@ -7,6 +7,7 @@ enum { IORING_MOCK_FEAT_CMD_COPY, IORING_MOCK_FEAT_RW_ZERO, IORING_MOCK_FEAT_RW_NOWAIT, + IORING_MOCK_FEAT_RW_ASYNC, IORING_MOCK_FEAT_END, }; @@ -24,7 +25,8 @@ struct io_uring_mock_create { __u32 out_fd; __u32 flags; __u64 file_size; - __u64 __resv[14]; + __u64 rw_delay_ns; + __u64 __resv[13]; }; enum { diff --git a/io_uring/mock_file.c b/io_uring/mock_file.c index 0eb1d3bd6368..ed6a5505763e 100644 --- a/io_uring/mock_file.c +++ b/io_uring/mock_file.c @@ -4,13 +4,22 @@ #include #include #include +#include +#include #include #include #include +struct io_mock_iocb { + struct kiocb *iocb; + struct hrtimer timer; + int res; +}; + struct io_mock_file { - size_t size; + size_t size; + u64 rw_delay_ns; }; #define IO_VALID_COPY_CMD_FLAGS IORING_MOCK_COPY_FROM @@ -86,14 +95,48 @@ static int io_mock_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) return -ENOTSUPP; } +static enum hrtimer_restart io_mock_rw_timer_expired(struct hrtimer *timer) +{ + struct io_mock_iocb *mio = container_of(timer, struct io_mock_iocb, timer); + struct kiocb *iocb = mio->iocb; + + WRITE_ONCE(iocb->private, NULL); + iocb->ki_complete(iocb, mio->res); + kfree(mio); + return HRTIMER_NORESTART; +} + +static ssize_t io_mock_delay_rw(struct kiocb *iocb, size_t len) +{ + struct io_mock_file *mf = iocb->ki_filp->private_data; + struct io_mock_iocb *mio; + + mio = kzalloc(sizeof(*mio), GFP_KERNEL); + if (!mio) + return -ENOMEM; + + mio->iocb = iocb; + mio->res = len; + hrtimer_setup(&mio->timer, io_mock_rw_timer_expired, + CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_start(&mio->timer, ns_to_ktime(mf->rw_delay_ns), + HRTIMER_MODE_REL); + return -EIOCBQUEUED; +} + static ssize_t io_mock_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct io_mock_file *mf = iocb->ki_filp->private_data; size_t len = iov_iter_count(to); + size_t nr_zeroed; if (iocb->ki_pos + len > mf->size) return -EINVAL; - return iov_iter_zero(len, to); + nr_zeroed = iov_iter_zero(len, to); + if (!mf->rw_delay_ns || nr_zeroed != len) + return nr_zeroed; + + return io_mock_delay_rw(iocb, len); } static ssize_t io_mock_write_iter(struct kiocb *iocb, struct iov_iter *from) @@ -103,8 +146,12 @@ static ssize_t io_mock_write_iter(struct kiocb *iocb, struct iov_iter *from) if (iocb->ki_pos + len > mf->size) return -EINVAL; - iov_iter_advance(from, len); - return len; + if (!mf->rw_delay_ns) { + iov_iter_advance(from, len); + return len; + } + + return io_mock_delay_rw(iocb, len); } static loff_t io_mock_llseek(struct file *file, loff_t offset, int whence) @@ -165,6 +212,9 @@ static int io_create_mock_file(struct io_uring_cmd *cmd, unsigned int issue_flag return -EINVAL; if (mc.file_size > SZ_1G) return -EINVAL; + if (mc.rw_delay_ns > NSEC_PER_SEC) + return -EINVAL; + mf = kzalloc(sizeof(*mf), GFP_KERNEL_ACCOUNT); if (!mf) return -ENOMEM; @@ -174,6 +224,7 @@ static int io_create_mock_file(struct io_uring_cmd *cmd, unsigned int issue_flag goto fail; mf->size = mc.file_size; + mf->rw_delay_ns = mc.rw_delay_ns; file = anon_inode_create_getfile("[io_uring_mock]", &io_mock_fops, mf, O_RDWR | O_CLOEXEC, NULL); if (IS_ERR(file)) { -- 2.49.0