diff options
| author | Bob Liu <bob.liu@oracle.com> | 2019-11-13 13:06:25 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-14 05:41:01 +0300 |
| commit | 9d858b21483981db9c0cb4b184d4cdeb4bc525c2 (patch) | |
| tree | c7d396dbc7ad5452ff687dda066d66660f8d150f /fs/io_uring.c | |
| parent | 2f6d9b9d6357ede64a29437676884ee263039910 (diff) | |
| download | linux-9d858b21483981db9c0cb4b184d4cdeb4bc525c2.tar.xz | |
io_uring: introduce req_need_defer()
Makes the code easier to read.
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 297b9e80dc5c..9500780bcaea 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -448,7 +448,7 @@ err: return NULL; } -static inline bool __io_sequence_defer(struct io_kiocb *req) +static inline bool __req_need_defer(struct io_kiocb *req) { struct io_ring_ctx *ctx = req->ctx; @@ -456,12 +456,12 @@ static inline bool __io_sequence_defer(struct io_kiocb *req) + atomic_read(&ctx->cached_cq_overflow); } -static inline bool io_sequence_defer(struct io_kiocb *req) +static inline bool req_need_defer(struct io_kiocb *req) { - if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN) - return false; + if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) == REQ_F_IO_DRAIN) + return __req_need_defer(req); - return __io_sequence_defer(req); + return false; } static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx) @@ -469,7 +469,7 @@ static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx) struct io_kiocb *req; req = list_first_entry_or_null(&ctx->defer_list, struct io_kiocb, list); - if (req && !io_sequence_defer(req)) { + if (req && !req_need_defer(req)) { list_del_init(&req->list); return req; } @@ -482,7 +482,7 @@ static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx) struct io_kiocb *req; req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list); - if (req && !__io_sequence_defer(req)) { + if (req && !__req_need_defer(req)) { list_del_init(&req->list); return req; } @@ -2436,7 +2436,8 @@ static int io_req_defer(struct io_kiocb *req) struct io_uring_sqe *sqe_copy; struct io_ring_ctx *ctx = req->ctx; - if (!io_sequence_defer(req) && list_empty(&ctx->defer_list)) + /* Still need defer if there is pending req in defer list. */ + if (!req_need_defer(req) && list_empty(&ctx->defer_list)) return 0; sqe_copy = kmalloc(sizeof(*sqe_copy), GFP_KERNEL); @@ -2444,7 +2445,7 @@ static int io_req_defer(struct io_kiocb *req) return -EAGAIN; spin_lock_irq(&ctx->completion_lock); - if (!io_sequence_defer(req) && list_empty(&ctx->defer_list)) { + if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { spin_unlock_irq(&ctx->completion_lock); kfree(sqe_copy); return 0; |