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| author | Dylan Yudaken <dylany@fb.com> | 2022-02-22 02:55:02 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-24 07:19:57 +0100 |
| commit | ea528ecac3ae58d8197871b29748eefca7d46be8 (patch) | |
| tree | 905dc7a4a21fdbe93a88b8f3dce516a5416f48a0 /io_uring | |
| parent | 076f872314d4da36e878673cbef1eae3514b0c6d (diff) | |
| download | linux-stable-ea528ecac3ae58d8197871b29748eefca7d46be8.tar.gz linux-stable-ea528ecac3ae58d8197871b29748eefca7d46be8.tar.bz2 linux-stable-ea528ecac3ae58d8197871b29748eefca7d46be8.zip | |
io_uring: update kiocb->ki_pos at execution time
commit d34e1e5b396a0dbaa4a29b7138df662cfb9d8e8e upstream.
Update kiocb->ki_pos at execution time rather than in io_prep_rw().
io_prep_rw() happens before the job is enqueued to a worker and so the
offset might be read multiple times before being executed once.
Ensures that the file position in a set of _linked_ SQEs will be only
obtained after earlier SQEs have completed, and so will include their
incremented file position.
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/io_uring.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index d8926475cd88..eaf8463c9b14 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -2919,14 +2919,6 @@ 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) { - if (!(file->f_mode & FMODE_STREAM)) { - req->flags |= REQ_F_CUR_POS; - kiocb->ki_pos = file->f_pos; - } else { - kiocb->ki_pos = 0; - } - } kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); kiocb->ki_flags = iocb_flags(kiocb->ki_filp); ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); @@ -3008,6 +3000,20 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) } } +static inline void io_kiocb_update_pos(struct io_kiocb *req) +{ + struct kiocb *kiocb = &req->rw.kiocb; + + if (kiocb->ki_pos == -1) { + if (!(req->file->f_mode & FMODE_STREAM)) { + req->flags |= REQ_F_CUR_POS; + kiocb->ki_pos = req->file->f_pos; + } else { + kiocb->ki_pos = 0; + } + } +} + static void kiocb_done(struct kiocb *kiocb, ssize_t ret, unsigned int issue_flags) { @@ -3563,6 +3569,8 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) return ret ?: -EAGAIN; } + io_kiocb_update_pos(req); + ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); if (unlikely(ret)) { kfree(iovec); @@ -3697,6 +3705,8 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags) (req->flags & REQ_F_ISREG)) goto copy_iov; + io_kiocb_update_pos(req); + ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); if (unlikely(ret)) goto out_free; |