io_uring: pass in struct io_cancel_data consistently

In preparation for being able to not only key cancel off the user_data,
pass in the io_cancel_data struct for the various functions that deal
with request cancelation.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20220418164402.75259-3-axboe@kernel.dk

diff --git a/fs/io_uring.c b/fs/io_uring.c
index be625f5..b72323c 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -988,6 +988,11 @@ struct io_defer_entry {
        u32                     seq;
 };
 
+struct io_cancel_data {
+       struct io_ring_ctx *ctx;
+       u64 data;
+};
+
 struct io_op_def {
        /* needs req->file assigned */
        unsigned                needs_file : 1;
@@ -6298,16 +6303,16 @@ static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx,
        return found;
 }
 
-static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr,
-                                    bool poll_only)
+static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only,
+                                    struct io_cancel_data *cd)
        __must_hold(&ctx->completion_lock)
 {
        struct hlist_head *list;
        struct io_kiocb *req;
 
-       list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)];
+       list = &ctx->cancel_hash[hash_long(cd->data, ctx->cancel_hash_bits)];
        hlist_for_each_entry(req, list, hash_node) {
-               if (sqe_addr != req->cqe.user_data)
+               if (cd->data != req->cqe.user_data)
                        continue;
                if (poll_only && req->opcode != IORING_OP_POLL_ADD)
                        continue;
@@ -6326,10 +6331,10 @@ static bool io_poll_disarm(struct io_kiocb *req)
        return true;
 }
 
-static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
+static int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
        __must_hold(&ctx->completion_lock)
 {
-       struct io_kiocb *req = io_poll_find(ctx, sqe_addr, false);
+       struct io_kiocb *req = io_poll_find(ctx, false, cd);
 
        if (!req)
                return -ENOENT;
@@ -6421,13 +6426,14 @@ static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags)
 
 static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags)
 {
+       struct io_cancel_data cd = { .data = req->poll_update.old_user_data, };
        struct io_ring_ctx *ctx = req->ctx;
        struct io_kiocb *preq;
        int ret2, ret = 0;
        bool locked;
 
        spin_lock(&ctx->completion_lock);
-       preq = io_poll_find(ctx, req->poll_update.old_user_data, true);
+       preq = io_poll_find(ctx, true, &cd);
        if (!preq || !io_poll_disarm(preq)) {
                spin_unlock(&ctx->completion_lock);
                ret = preq ? -EALREADY : -ENOENT;
@@ -6487,7 +6493,7 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
 }
 
 static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
-                                          __u64 user_data)
+                                          struct io_cancel_data *cd)
        __must_hold(&ctx->timeout_lock)
 {
        struct io_timeout_data *io;
@@ -6495,7 +6501,7 @@ static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
        bool found = false;
 
        list_for_each_entry(req, &ctx->timeout_list, timeout.list) {
-               found = user_data == req->cqe.user_data;
+               found = cd->data == req->cqe.user_data;
                if (found)
                        break;
        }
@@ -6509,13 +6515,13 @@ static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
        return req;
 }
 
-static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
+static int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
        __must_hold(&ctx->completion_lock)
 {
        struct io_kiocb *req;
 
        spin_lock_irq(&ctx->timeout_lock);
-       req = io_timeout_extract(ctx, user_data);
+       req = io_timeout_extract(ctx, cd);
        spin_unlock_irq(&ctx->timeout_lock);
 
        if (IS_ERR(req))
@@ -6569,7 +6575,8 @@ static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
                             struct timespec64 *ts, enum hrtimer_mode mode)
        __must_hold(&ctx->timeout_lock)
 {
-       struct io_kiocb *req = io_timeout_extract(ctx, user_data);
+       struct io_cancel_data cd = { .data = user_data, };
+       struct io_kiocb *req = io_timeout_extract(ctx, &cd);
        struct io_timeout_data *data;
 
        if (IS_ERR(req))
@@ -6634,8 +6641,10 @@ static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags)
        int ret;
 
        if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) {
+               struct io_cancel_data cd = { .data = tr->addr, };
+
                spin_lock(&ctx->completion_lock);
-               ret = io_timeout_cancel(ctx, tr->addr);
+               ret = io_timeout_cancel(ctx, &cd);
                spin_unlock(&ctx->completion_lock);
        } else {
                enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags);
@@ -6763,30 +6772,24 @@ add:
        return 0;
 }
 
-struct io_cancel_data {
-       struct io_ring_ctx *ctx;
-       u64 user_data;
-};
-
 static bool io_cancel_cb(struct io_wq_work *work, void *data)
 {
        struct io_kiocb *req = container_of(work, struct io_kiocb, work);
        struct io_cancel_data *cd = data;
 
-       return req->ctx == cd->ctx && req->cqe.user_data == cd->user_data;
+       return req->ctx == cd->ctx && req->cqe.user_data == cd->data;
 }
 
-static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data,
-                              struct io_ring_ctx *ctx)
+static int io_async_cancel_one(struct io_uring_task *tctx,
+                              struct io_cancel_data *cd)
 {
-       struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, };
        enum io_wq_cancel cancel_ret;
        int ret = 0;
 
        if (!tctx || !tctx->io_wq)
                return -ENOENT;
 
-       cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false);
+       cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, false);
        switch (cancel_ret) {
        case IO_WQ_CANCEL_OK:
                ret = 0;
@@ -6802,14 +6805,14 @@ static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data,
        return ret;
 }
 
-static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr)
+static int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd)
 {
        struct io_ring_ctx *ctx = req->ctx;
        int ret;
 
        WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
 
-       ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx);
+       ret = io_async_cancel_one(req->task->io_uring, cd);
        /*
         * Fall-through even for -EALREADY, as we may have poll armed
         * that need unarming.
@@ -6818,10 +6821,10 @@ static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr)
                return 0;
 
        spin_lock(&ctx->completion_lock);
-       ret = io_poll_cancel(ctx, sqe_addr);
+       ret = io_poll_cancel(ctx, cd);
        if (ret != -ENOENT)
                goto out;
-       ret = io_timeout_cancel(ctx, sqe_addr);
+       ret = io_timeout_cancel(ctx, cd);
 out:
        spin_unlock(&ctx->completion_lock);
        return ret;
@@ -6845,11 +6848,14 @@ static int io_async_cancel_prep(struct io_kiocb *req,
 static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
 {
        struct io_ring_ctx *ctx = req->ctx;
-       u64 sqe_addr = req->cancel.addr;
+       struct io_cancel_data cd = {
+               .ctx            = ctx,
+               .data           = req->cancel.addr,
+       };
        struct io_tctx_node *node;
        int ret;
 
-       ret = io_try_cancel_userdata(req, sqe_addr);
+       ret = io_try_cancel(req, &cd);
        if (ret != -ENOENT)
                goto done;
 
@@ -6859,7 +6865,7 @@ static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
        list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
                struct io_uring_task *tctx = node->task->io_uring;
 
-               ret = io_async_cancel_one(tctx, req->cancel.addr, ctx);
+               ret = io_async_cancel_one(tctx, &cd);
                if (ret != -ENOENT)
                        break;
        }
@@ -7455,8 +7461,14 @@ static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked)
        int ret = -ENOENT;
 
        if (prev) {
-               if (!(req->task->flags & PF_EXITING))
-                       ret = io_try_cancel_userdata(req, prev->cqe.user_data);
+               if (!(req->task->flags & PF_EXITING)) {
+                       struct io_cancel_data cd = {
+                               .ctx            = req->ctx,
+                               .data           = prev->cqe.user_data,
+                       };
+
+                       ret = io_try_cancel(req, &cd);
+               }
                io_req_complete_post(req, ret ?: -ETIME, 0);
                io_put_req(prev);
        } else {