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| author | Jens Axboe <axboe@kernel.dk> | 2019-12-09 14:52:35 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-12-10 16:33:23 -0700 |
| commit | 8a4955ff1cca7d4da480774034a16e7c28bafec8 (patch) | |
| tree | 86bb11ff4545cd4de35a2e58839a6fdd2da88977 /fs/io_uring.c | |
| parent | e995d5123ed433e37a8d63ac528737c912592e3d (diff) | |
| download | lwn-8a4955ff1cca7d4da480774034a16e7c28bafec8.tar.gz lwn-8a4955ff1cca7d4da480774034a16e7c28bafec8.zip | |
io_uring: sqthread should grab ctx->uring_lock for submissions
We use the mutex to guard against registered file updates, for instance.
Ensure we're safe in accessing that state against concurrent updates.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 040e6c11ff37..366fc351869d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2996,12 +2996,7 @@ static int io_issue_sqe(struct io_kiocb *req, struct io_kiocb **nxt, if (req->result == -EAGAIN) return -EAGAIN; - /* workqueue context doesn't hold uring_lock, grab it now */ - if (req->in_async) - mutex_lock(&ctx->uring_lock); io_iopoll_req_issued(req); - if (req->in_async) - mutex_unlock(&ctx->uring_lock); } return 0; @@ -3655,7 +3650,9 @@ static int io_sq_thread(void *data) } to_submit = min(to_submit, ctx->sq_entries); + mutex_lock(&ctx->uring_lock); ret = io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm, true); + mutex_unlock(&ctx->uring_lock); if (ret > 0) inflight += ret; } |