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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-06-17 18:14:05 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-06-18 09:22:02 -0600 |
| commit | a3dbdf54da80326fd12bc11ad75ecd699a82374f (patch) | |
| tree | 5ca8e303a10f0f88f34d4501d9460d18a97b3dcb /fs/io_uring.c | |
| parent | c854357bc1b965e1e261c612d5be1297dfb3e406 (diff) | |
| download | linux-stable-a3dbdf54da80326fd12bc11ad75ecd699a82374f.tar.gz linux-stable-a3dbdf54da80326fd12bc11ad75ecd699a82374f.tar.bz2 linux-stable-a3dbdf54da80326fd12bc11ad75ecd699a82374f.zip | |
io_uring: refactor io_get_sequence()
Clean up io_get_sequence() and add a comment describing the magic around
sequence correction.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f55dc409936b8afa4698d24b8677a34d31077ccb.1623949695.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 474705a97f29..c41e9a925fa2 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -5993,13 +5993,12 @@ static int io_req_prep_async(struct io_kiocb *req) static u32 io_get_sequence(struct io_kiocb *req) { - struct io_kiocb *pos; - struct io_ring_ctx *ctx = req->ctx; - u32 nr_reqs = 0; + u32 seq = req->ctx->cached_sq_head; - io_for_each_link(pos, req) - nr_reqs++; - return ctx->cached_sq_head - nr_reqs; + /* need original cached_sq_head, but it was increased for each req */ + io_for_each_link(req, req) + seq--; + return seq; } static bool io_drain_req(struct io_kiocb *req) |