diff options
Diffstat (limited to 'fs/afs/rxrpc.c')
-rw-r--r-- | fs/afs/rxrpc.c | 364 |
1 files changed, 199 insertions, 165 deletions
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c index 25f05a8d21b1..8f76b13d5549 100644 --- a/fs/afs/rxrpc.c +++ b/fs/afs/rxrpc.c @@ -10,6 +10,8 @@ */ #include <linux/slab.h> +#include <linux/sched/signal.h> + #include <net/sock.h> #include <net/af_rxrpc.h> #include <rxrpc/packet.h> @@ -19,35 +21,16 @@ struct socket *afs_socket; /* my RxRPC socket */ static struct workqueue_struct *afs_async_calls; static struct afs_call *afs_spare_incoming_call; -static atomic_t afs_outstanding_calls; +atomic_t afs_outstanding_calls; -static void afs_free_call(struct afs_call *); static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long); static int afs_wait_for_call_to_complete(struct afs_call *); static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long); -static int afs_dont_wait_for_call_to_complete(struct afs_call *); static void afs_process_async_call(struct work_struct *); static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long); static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long); static int afs_deliver_cm_op_id(struct afs_call *); -/* synchronous call management */ -const struct afs_wait_mode afs_sync_call = { - .notify_rx = afs_wake_up_call_waiter, - .wait = afs_wait_for_call_to_complete, -}; - -/* asynchronous call management */ -const struct afs_wait_mode afs_async_call = { - .notify_rx = afs_wake_up_async_call, - .wait = afs_dont_wait_for_call_to_complete, -}; - -/* asynchronous incoming call management */ -static const struct afs_wait_mode afs_async_incoming_call = { - .notify_rx = afs_wake_up_async_call, -}; - /* asynchronous incoming call initial processing */ static const struct afs_call_type afs_RXCMxxxx = { .name = "CB.xxxx", @@ -130,9 +113,11 @@ void afs_close_socket(void) { _enter(""); + kernel_listen(afs_socket, 0); + flush_workqueue(afs_async_calls); + if (afs_spare_incoming_call) { - atomic_inc(&afs_outstanding_calls); - afs_free_call(afs_spare_incoming_call); + afs_put_call(afs_spare_incoming_call); afs_spare_incoming_call = NULL; } @@ -141,7 +126,6 @@ void afs_close_socket(void) TASK_UNINTERRUPTIBLE); _debug("no outstanding calls"); - flush_workqueue(afs_async_calls); kernel_sock_shutdown(afs_socket, SHUT_RDWR); flush_workqueue(afs_async_calls); sock_release(afs_socket); @@ -152,44 +136,79 @@ void afs_close_socket(void) } /* - * free a call + * Allocate a call. */ -static void afs_free_call(struct afs_call *call) +static struct afs_call *afs_alloc_call(const struct afs_call_type *type, + gfp_t gfp) { - _debug("DONE %p{%s} [%d]", - call, call->type->name, atomic_read(&afs_outstanding_calls)); + struct afs_call *call; + int o; - ASSERTCMP(call->rxcall, ==, NULL); - ASSERT(!work_pending(&call->async_work)); - ASSERT(call->type->name != NULL); + call = kzalloc(sizeof(*call), gfp); + if (!call) + return NULL; - kfree(call->request); - kfree(call); + call->type = type; + atomic_set(&call->usage, 1); + INIT_WORK(&call->async_work, afs_process_async_call); + init_waitqueue_head(&call->waitq); - if (atomic_dec_and_test(&afs_outstanding_calls)) - wake_up_atomic_t(&afs_outstanding_calls); + o = atomic_inc_return(&afs_outstanding_calls); + trace_afs_call(call, afs_call_trace_alloc, 1, o, + __builtin_return_address(0)); + return call; } /* - * End a call but do not free it + * Dispose of a reference on a call. */ -static void afs_end_call_nofree(struct afs_call *call) +void afs_put_call(struct afs_call *call) { - if (call->rxcall) { - rxrpc_kernel_end_call(afs_socket, call->rxcall); - call->rxcall = NULL; + int n = atomic_dec_return(&call->usage); + int o = atomic_read(&afs_outstanding_calls); + + trace_afs_call(call, afs_call_trace_put, n + 1, o, + __builtin_return_address(0)); + + ASSERTCMP(n, >=, 0); + if (n == 0) { + ASSERT(!work_pending(&call->async_work)); + ASSERT(call->type->name != NULL); + + if (call->rxcall) { + rxrpc_kernel_end_call(afs_socket, call->rxcall); + call->rxcall = NULL; + } + if (call->type->destructor) + call->type->destructor(call); + + kfree(call->request); + kfree(call); + + o = atomic_dec_return(&afs_outstanding_calls); + trace_afs_call(call, afs_call_trace_free, 0, o, + __builtin_return_address(0)); + if (o == 0) + wake_up_atomic_t(&afs_outstanding_calls); } - if (call->type->destructor) - call->type->destructor(call); } /* - * End a call and free it + * Queue the call for actual work. Returns 0 unconditionally for convenience. */ -static void afs_end_call(struct afs_call *call) +int afs_queue_call_work(struct afs_call *call) { - afs_end_call_nofree(call); - afs_free_call(call); + int u = atomic_inc_return(&call->usage); + + trace_afs_call(call, afs_call_trace_work, u, + atomic_read(&afs_outstanding_calls), + __builtin_return_address(0)); + + INIT_WORK(&call->work, call->type->work); + + if (!queue_work(afs_wq, &call->work)) + afs_put_call(call); + return 0; } /* @@ -200,25 +219,19 @@ struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, { struct afs_call *call; - call = kzalloc(sizeof(*call), GFP_NOFS); + call = afs_alloc_call(type, GFP_NOFS); if (!call) goto nomem_call; - _debug("CALL %p{%s} [%d]", - call, type->name, atomic_read(&afs_outstanding_calls)); - atomic_inc(&afs_outstanding_calls); - - call->type = type; - call->request_size = request_size; - call->reply_max = reply_max; - if (request_size) { + call->request_size = request_size; call->request = kmalloc(request_size, GFP_NOFS); if (!call->request) goto nomem_free; } if (reply_max) { + call->reply_max = reply_max; call->buffer = kmalloc(reply_max, GFP_NOFS); if (!call->buffer) goto nomem_free; @@ -228,7 +241,7 @@ struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, return call; nomem_free: - afs_free_call(call); + afs_put_call(call); nomem_call: return NULL; } @@ -246,68 +259,74 @@ void afs_flat_call_destructor(struct afs_call *call) call->buffer = NULL; } +#define AFS_BVEC_MAX 8 + +/* + * Load the given bvec with the next few pages. + */ +static void afs_load_bvec(struct afs_call *call, struct msghdr *msg, + struct bio_vec *bv, pgoff_t first, pgoff_t last, + unsigned offset) +{ + struct page *pages[AFS_BVEC_MAX]; + unsigned int nr, n, i, to, bytes = 0; + + nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX); + n = find_get_pages_contig(call->mapping, first, nr, pages); + ASSERTCMP(n, ==, nr); + + msg->msg_flags |= MSG_MORE; + for (i = 0; i < nr; i++) { + to = PAGE_SIZE; + if (first + i >= last) { + to = call->last_to; + msg->msg_flags &= ~MSG_MORE; + } + bv[i].bv_page = pages[i]; + bv[i].bv_len = to - offset; + bv[i].bv_offset = offset; + bytes += to - offset; + offset = 0; + } + + iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes); +} + /* * attach the data from a bunch of pages on an inode to a call */ -static int afs_send_pages(struct afs_call *call, struct msghdr *msg, - struct kvec *iov) +static int afs_send_pages(struct afs_call *call, struct msghdr *msg) { - struct page *pages[8]; - unsigned count, n, loop, offset, to; + struct bio_vec bv[AFS_BVEC_MAX]; + unsigned int bytes, nr, loop, offset; pgoff_t first = call->first, last = call->last; int ret; - _enter(""); - offset = call->first_offset; call->first_offset = 0; do { - _debug("attach %lx-%lx", first, last); - - count = last - first + 1; - if (count > ARRAY_SIZE(pages)) - count = ARRAY_SIZE(pages); - n = find_get_pages_contig(call->mapping, first, count, pages); - ASSERTCMP(n, ==, count); - - loop = 0; - do { - msg->msg_flags = 0; - to = PAGE_SIZE; - if (first + loop >= last) - to = call->last_to; - else - msg->msg_flags = MSG_MORE; - iov->iov_base = kmap(pages[loop]) + offset; - iov->iov_len = to - offset; - offset = 0; - - _debug("- range %u-%u%s", - offset, to, msg->msg_flags ? " [more]" : ""); - iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, - iov, 1, to - offset); - - /* have to change the state *before* sending the last - * packet as RxRPC might give us the reply before it - * returns from sending the request */ - if (first + loop >= last) - call->state = AFS_CALL_AWAIT_REPLY; - ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, - msg, to - offset); - kunmap(pages[loop]); - if (ret < 0) - break; - } while (++loop < count); - first += count; - - for (loop = 0; loop < count; loop++) - put_page(pages[loop]); + afs_load_bvec(call, msg, bv, first, last, offset); + offset = 0; + bytes = msg->msg_iter.count; + nr = msg->msg_iter.nr_segs; + + /* Have to change the state *before* sending the last + * packet as RxRPC might give us the reply before it + * returns from sending the request. + */ + if (first + nr - 1 >= last) + call->state = AFS_CALL_AWAIT_REPLY; + ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, + msg, bytes); + for (loop = 0; loop < nr; loop++) + put_page(bv[loop].bv_page); if (ret < 0) break; + + first += nr; } while (first <= last); - _leave(" = %d", ret); return ret; } @@ -315,12 +334,14 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg, * initiate a call */ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, - const struct afs_wait_mode *wait_mode) + bool async) { struct sockaddr_rxrpc srx; struct rxrpc_call *rxcall; struct msghdr msg; struct kvec iov[1]; + size_t offset; + u32 abort_code; int ret; _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); @@ -332,8 +353,7 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, call, call->type->name, key_serial(call->key), atomic_read(&afs_outstanding_calls)); - call->wait_mode = wait_mode; - INIT_WORK(&call->async_work, afs_process_async_call); + call->async = async; memset(&srx, 0, sizeof(srx)); srx.srx_family = AF_RXRPC; @@ -347,7 +367,9 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, /* create a call */ rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, (unsigned long) call, gfp, - wait_mode->notify_rx); + (async ? + afs_wake_up_async_call : + afs_wake_up_call_waiter)); call->key = NULL; if (IS_ERR(rxcall)) { ret = PTR_ERR(rxcall); @@ -368,9 +390,11 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, msg.msg_controllen = 0; msg.msg_flags = (call->send_pages ? MSG_MORE : 0); - /* have to change the state *before* sending the last packet as RxRPC - * might give us the reply before it returns from sending the - * request */ + /* We have to change the state *before* sending the last packet as + * rxrpc might give us the reply before it returns from sending the + * request. Further, if the send fails, we may already have been given + * a notification and may have collected it. + */ if (!call->send_pages) call->state = AFS_CALL_AWAIT_REPLY; ret = rxrpc_kernel_send_data(afs_socket, rxcall, @@ -379,19 +403,32 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, goto error_do_abort; if (call->send_pages) { - ret = afs_send_pages(call, &msg, iov); + ret = afs_send_pages(call, &msg); if (ret < 0) goto error_do_abort; } /* at this point, an async call may no longer exist as it may have * already completed */ - return wait_mode->wait(call); + if (call->async) + return -EINPROGRESS; + + return afs_wait_for_call_to_complete(call); error_do_abort: - rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, -ret, "KSD"); + call->state = AFS_CALL_COMPLETE; + if (ret != -ECONNABORTED) { + rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, + -ret, "KSD"); + } else { + abort_code = 0; + offset = 0; + rxrpc_kernel_recv_data(afs_socket, rxcall, NULL, 0, &offset, + false, &abort_code); + ret = call->type->abort_to_error(abort_code); + } error_kill_call: - afs_end_call(call); + afs_put_call(call); _leave(" = %d", ret); return ret; } @@ -416,6 +453,8 @@ static void afs_deliver_to_call(struct afs_call *call) ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, NULL, 0, &offset, false, &call->abort_code); + trace_afs_recv_data(call, 0, offset, false, ret); + if (ret == -EINPROGRESS || ret == -EAGAIN) return; if (ret == 1 || ret < 0) { @@ -434,16 +473,18 @@ static void afs_deliver_to_call(struct afs_call *call) case -EINPROGRESS: case -EAGAIN: goto out; + case -ECONNABORTED: + goto call_complete; case -ENOTCONN: abort_code = RX_CALL_DEAD; rxrpc_kernel_abort_call(afs_socket, call->rxcall, abort_code, -ret, "KNC"); - goto do_abort; + goto save_error; case -ENOTSUPP: - abort_code = RX_INVALID_OPERATION; + abort_code = RXGEN_OPCODE; rxrpc_kernel_abort_call(afs_socket, call->rxcall, abort_code, -ret, "KIV"); - goto do_abort; + goto save_error; case -ENODATA: case -EBADMSG: case -EMSGSIZE: @@ -453,19 +494,20 @@ static void afs_deliver_to_call(struct afs_call *call) abort_code = RXGEN_SS_UNMARSHAL; rxrpc_kernel_abort_call(afs_socket, call->rxcall, abort_code, EBADMSG, "KUM"); - goto do_abort; + goto save_error; } } done: if (call->state == AFS_CALL_COMPLETE && call->incoming) - afs_end_call(call); + afs_put_call(call); out: _leave(""); return; -do_abort: +save_error: call->error = ret; +call_complete: call->state = AFS_CALL_COMPLETE; goto done; } @@ -475,7 +517,6 @@ do_abort: */ static int afs_wait_for_call_to_complete(struct afs_call *call) { - const char *abort_why; int ret; DECLARE_WAITQUEUE(myself, current); @@ -494,13 +535,8 @@ static int afs_wait_for_call_to_complete(struct afs_call *call) continue; } - abort_why = "KWC"; - ret = call->error; - if (call->state == AFS_CALL_COMPLETE) - break; - abort_why = "KWI"; - ret = -EINTR; - if (signal_pending(current)) + if (call->state == AFS_CALL_COMPLETE || + signal_pending(current)) break; schedule(); } @@ -508,15 +544,16 @@ static int afs_wait_for_call_to_complete(struct afs_call *call) remove_wait_queue(&call->waitq, &myself); __set_current_state(TASK_RUNNING); - /* kill the call */ + /* Kill off the call if it's still live. */ if (call->state < AFS_CALL_COMPLETE) { - _debug("call incomplete"); + _debug("call interrupted"); rxrpc_kernel_abort_call(afs_socket, call->rxcall, - RX_CALL_DEAD, -ret, abort_why); + RX_USER_ABORT, -EINTR, "KWI"); } + ret = call->error; _debug("call complete"); - afs_end_call(call); + afs_put_call(call); _leave(" = %d", ret); return ret; } @@ -540,24 +577,25 @@ static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, unsigned long call_user_ID) { struct afs_call *call = (struct afs_call *)call_user_ID; + int u; + trace_afs_notify_call(rxcall, call); call->need_attention = true; - queue_work(afs_async_calls, &call->async_work); -} -/* - * put a call into asynchronous mode - * - mustn't touch the call descriptor as the call my have completed by the - * time we get here - */ -static int afs_dont_wait_for_call_to_complete(struct afs_call *call) -{ - _enter(""); - return -EINPROGRESS; + u = __atomic_add_unless(&call->usage, 1, 0); + if (u != 0) { + trace_afs_call(call, afs_call_trace_wake, u, + atomic_read(&afs_outstanding_calls), + __builtin_return_address(0)); + + if (!queue_work(afs_async_calls, &call->async_work)) + afs_put_call(call); + } } /* - * delete an asynchronous call + * Delete an asynchronous call. The work item carries a ref to the call struct + * that we need to release. */ static void afs_delete_async_call(struct work_struct *work) { @@ -565,13 +603,14 @@ static void afs_delete_async_call(struct work_struct *work) _enter(""); - afs_free_call(call); + afs_put_call(call); _leave(""); } /* - * perform processing on an asynchronous call + * Perform I/O processing on an asynchronous call. The work item carries a ref + * to the call struct that we either need to release or to pass on. */ static void afs_process_async_call(struct work_struct *work) { @@ -584,21 +623,19 @@ static void afs_process_async_call(struct work_struct *work) afs_deliver_to_call(call); } - if (call->state == AFS_CALL_COMPLETE && call->wait_mode) { - if (call->wait_mode->async_complete) - call->wait_mode->async_complete(call->reply, - call->error); + if (call->state == AFS_CALL_COMPLETE) { call->reply = NULL; - /* kill the call */ - afs_end_call_nofree(call); - - /* we can't just delete the call because the work item may be - * queued */ + /* We have two refs to release - one from the alloc and one + * queued with the work item - and we can't just deallocate the + * call because the work item may be queued again. + */ call->async_work.func = afs_delete_async_call; - queue_work(afs_async_calls, &call->async_work); + if (!queue_work(afs_async_calls, &call->async_work)) + afs_put_call(call); } + afs_put_call(call); _leave(""); } @@ -618,15 +655,13 @@ static void afs_charge_preallocation(struct work_struct *work) for (;;) { if (!call) { - call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); + call = afs_alloc_call(&afs_RXCMxxxx, GFP_KERNEL); if (!call) break; - INIT_WORK(&call->async_work, afs_process_async_call); - call->wait_mode = &afs_async_incoming_call; - call->type = &afs_RXCMxxxx; - init_waitqueue_head(&call->waitq); + call->async = true; call->state = AFS_CALL_AWAIT_OP_ID; + init_waitqueue_head(&call->waitq); } if (rxrpc_kernel_charge_accept(afs_socket, @@ -648,9 +683,8 @@ static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, { struct afs_call *call = (struct afs_call *)user_call_ID; - atomic_inc(&afs_outstanding_calls); call->rxcall = NULL; - afs_free_call(call); + afs_put_call(call); } /* @@ -659,7 +693,6 @@ static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, unsigned long user_call_ID) { - atomic_inc(&afs_outstanding_calls); queue_work(afs_wq, &afs_charge_preallocation_work); } @@ -689,6 +722,8 @@ static int afs_deliver_cm_op_id(struct afs_call *call) if (!afs_cm_incoming_call(call)) return -ENOTSUPP; + trace_afs_cb_call(call); + /* pass responsibility for the remainer of this message off to the * cache manager op */ return call->type->deliver(call); @@ -721,7 +756,6 @@ void afs_send_empty_reply(struct afs_call *call) rxrpc_kernel_abort_call(afs_socket, call->rxcall, RX_USER_ABORT, ENOMEM, "KOO"); default: - afs_end_call(call); _leave(" [error]"); return; } @@ -760,7 +794,6 @@ void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) rxrpc_kernel_abort_call(afs_socket, call->rxcall, RX_USER_ABORT, ENOMEM, "KOO"); } - afs_end_call(call); _leave(" [error]"); } @@ -780,6 +813,7 @@ int afs_extract_data(struct afs_call *call, void *buf, size_t count, ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, buf, count, &call->offset, want_more, &call->abort_code); + trace_afs_recv_data(call, count, call->offset, want_more, ret); if (ret == 0 || ret == -EAGAIN) return ret; |