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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-02-12 18:41:17 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-02-12 11:49:50 -0700 |
| commit | 5be9ad1e4287e1742fd8d253267c86446441bdaf (patch) | |
| tree | 632d27015921ea6a3fba0b983acbcba13eab9bf7 /fs/io_uring.c | |
| parent | cdbff98223330cdb6c57ead1533ce066dddd61b7 (diff) | |
| download | linux-stable-5be9ad1e4287e1742fd8d253267c86446441bdaf.tar.gz linux-stable-5be9ad1e4287e1742fd8d253267c86446441bdaf.tar.bz2 linux-stable-5be9ad1e4287e1742fd8d253267c86446441bdaf.zip | |
io_uring: optimise io_init_req() flags setting
Invalid req->flags are tolerated by free/put well, avoid this dancing
needlessly presetting it to zero, and then not even resetting but
modifying it, i.e. "|=".
Signed-off-by: Pavel Begunkov <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 | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 776531f6e18b..2e8cb739c835 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6806,14 +6806,15 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, { struct io_submit_state *state; unsigned int sqe_flags; - int id, ret; + int id, ret = 0; req->opcode = READ_ONCE(sqe->opcode); + /* same numerical values with corresponding REQ_F_*, safe to copy */ + req->flags = sqe_flags = READ_ONCE(sqe->flags); req->user_data = READ_ONCE(sqe->user_data); req->async_data = NULL; req->file = NULL; req->ctx = ctx; - req->flags = 0; req->link = NULL; req->fixed_rsrc_refs = NULL; /* one is dropped after submission, the other at completion */ @@ -6821,17 +6822,16 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, req->task = current; req->result = 0; + /* enforce forwards compatibility on users */ + if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) + return -EINVAL; + if (unlikely(req->opcode >= IORING_OP_LAST)) return -EINVAL; if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) return -EFAULT; - sqe_flags = READ_ONCE(sqe->flags); - /* enforce forwards compatibility on users */ - if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) - return -EINVAL; - if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) return -EACCES; @@ -6854,8 +6854,6 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, req->work.flags |= IO_WQ_WORK_CREDS; } - /* same numerical values with corresponding REQ_F_*, safe to copy */ - req->flags |= sqe_flags; state = &ctx->submit_state; /* @@ -6868,7 +6866,6 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, state->plug_started = true; } - ret = 0; if (io_op_defs[req->opcode].needs_file) { bool fixed = req->flags & REQ_F_FIXED_FILE; |