diff --git a/fs/io_uring.c b/fs/io_uring.c index 407ba3388e1433d4323cb86ce259da6d6a5269d8..5286620e4e46473548063783d9a64dca65855ac7 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -495,6 +495,7 @@ struct io_kiocb { #define REQ_F_COMP_LOCKED 32768 /* completion under lock */ #define REQ_F_HARDLINK 65536 /* doesn't sever on completion < 0 */ #define REQ_F_FORCE_ASYNC 131072 /* IOSQE_ASYNC */ +#define REQ_F_CUR_POS 262144 /* read/write uses file position */ u64 user_data; u32 result; u32 sequence; @@ -1711,6 +1712,10 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, 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)); @@ -1782,6 +1787,10 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) 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 @@ -6154,7 +6163,7 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) goto err; p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | - IORING_FEAT_SUBMIT_STABLE; + IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS; trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); return ret; err: diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 7fdf994f3313b2ade68d49255c4046397c7b795d..1f96136eb6ee7ef595492c8d8dbbb43f7953acef 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -174,6 +174,7 @@ struct io_uring_params { #define IORING_FEAT_SINGLE_MMAP (1U << 0) #define IORING_FEAT_NODROP (1U << 1) #define IORING_FEAT_SUBMIT_STABLE (1U << 2) +#define IORING_FEAT_RW_CUR_POS (1U << 3) /* * io_uring_register(2) opcodes and arguments