diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2022-07-12 23:52:41 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-25 03:41:06 +0300 |
| commit | 68ef5578efc8893489400b1ec30af66dab4f75ff (patch) | |
| tree | 0cf6fa21947d0b2d9ad10276df8fd892ca4ef9d6 /io_uring/rsrc.h | |
| parent | e58d498e81baa9fd8acf5132d8b2d4f829361f6b (diff) | |
| download | linux-68ef5578efc8893489400b1ec30af66dab4f75ff.tar.xz | |
io_uring: add rsrc referencing for notifiers
In preparation to zerocopy sends with fixed buffers make notifiers to
reference the rsrc node to protect the used fixed buffers. We can't just
grab it for a send request as notifiers can likely outlive requests that
used it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3cd7a01d26837945b6982fa9cf15a63230f2ed4f.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/rsrc.h')
| -rw-r--r-- | io_uring/rsrc.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 87f58315b247..af342fd239d0 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -135,6 +135,13 @@ static inline void io_req_put_rsrc_locked(struct io_kiocb *req, } } +static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) +{ + ctx->rsrc_cached_refs--; + if (unlikely(ctx->rsrc_cached_refs < 0)) + io_rsrc_refs_refill(ctx); +} + static inline void io_req_set_rsrc_node(struct io_kiocb *req, struct io_ring_ctx *ctx, unsigned int issue_flags) @@ -144,9 +151,8 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req, if (!(issue_flags & IO_URING_F_UNLOCKED)) { lockdep_assert_held(&ctx->uring_lock); - ctx->rsrc_cached_refs--; - if (unlikely(ctx->rsrc_cached_refs < 0)) - io_rsrc_refs_refill(ctx); + + io_charge_rsrc_node(ctx); } else { percpu_ref_get(&req->rsrc_node->refs); } |