diff options
Diffstat (limited to 'net/9p/trans_fd.c')
| -rw-r--r-- | net/9p/trans_fd.c | 860 |
1 files changed, 406 insertions, 454 deletions
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index bc5b6965981b..334d39cc5ba3 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -61,7 +61,6 @@ struct p9_fd_opts { u16 port; }; - /** * struct p9_trans_fd - transport state * @rd: reference to file to read from @@ -206,30 +205,11 @@ struct p9_mux_rpc { wait_queue_head_t wqueue; }; -static int p9_poll_proc(void *); -static void p9_read_work(struct work_struct *work); -static void p9_write_work(struct work_struct *work); -static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, - poll_table *p); -static int p9_fd_write(struct p9_client *client, void *v, int len); -static int p9_fd_read(struct p9_client *client, void *v, int len); - static DEFINE_SPINLOCK(p9_poll_lock); static LIST_HEAD(p9_poll_pending_list); static struct workqueue_struct *p9_mux_wq; static struct task_struct *p9_poll_task; -static void p9_conn_destroy(struct p9_conn *); -static unsigned int p9_fd_poll(struct p9_client *client, - struct poll_table_struct *pt); - -#ifdef P9_NONBLOCK -static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, - p9_conn_req_callback cb, void *a); -#endif /* P9_NONBLOCK */ - -static void p9_conn_cancel(struct p9_conn *m, int err); - static u16 p9_mux_get_tag(struct p9_conn *m) { int tag; @@ -267,303 +247,38 @@ static void p9_mux_poll_stop(struct p9_conn *m) } /** - * p9_conn_create - allocate and initialize the per-session mux data - * @client: client instance - * - * Note: Creates the polling task if this is the first session. - */ - -static struct p9_conn *p9_conn_create(struct p9_client *client) -{ - int i, n; - struct p9_conn *m; - - P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize); - m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); - if (!m) - return ERR_PTR(-ENOMEM); - - spin_lock_init(&m->lock); - INIT_LIST_HEAD(&m->mux_list); - m->client = client; - m->tagpool = p9_idpool_create(); - if (IS_ERR(m->tagpool)) { - kfree(m); - return ERR_PTR(-ENOMEM); - } - - INIT_LIST_HEAD(&m->req_list); - INIT_LIST_HEAD(&m->unsent_req_list); - INIT_WORK(&m->rq, p9_read_work); - INIT_WORK(&m->wq, p9_write_work); - INIT_LIST_HEAD(&m->poll_pending_link); - init_poll_funcptr(&m->pt, p9_pollwait); - - n = p9_fd_poll(client, &m->pt); - if (n & POLLIN) { - P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); - set_bit(Rpending, &m->wsched); - } - - if (n & POLLOUT) { - P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); - set_bit(Wpending, &m->wsched); - } - - for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { - if (IS_ERR(m->poll_wait[i].wait_addr)) { - p9_mux_poll_stop(m); - kfree(m); - /* return the error code */ - return (void *)m->poll_wait[i].wait_addr; - } - } - - return m; -} - -/** - * p9_mux_destroy - cancels all pending requests and frees mux resources - * @m: mux to destroy - * - */ - -static void p9_conn_destroy(struct p9_conn *m) -{ - P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, - m->mux_list.prev, m->mux_list.next); - - p9_mux_poll_stop(m); - cancel_work_sync(&m->rq); - cancel_work_sync(&m->wq); - - p9_conn_cancel(m, -ECONNRESET); - - m->client = NULL; - p9_idpool_destroy(m->tagpool); - kfree(m); -} - -static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) -{ - struct p9_poll_wait *pwait = - container_of(wait, struct p9_poll_wait, wait); - struct p9_conn *m = pwait->conn; - unsigned long flags; - DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); - - spin_lock_irqsave(&p9_poll_lock, flags); - if (list_empty(&m->poll_pending_link)) - list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); - spin_unlock_irqrestore(&p9_poll_lock, flags); - - /* perform the default wake up operation */ - return default_wake_function(&dummy_wait, mode, sync, key); -} - -/** - * p9_pollwait - add poll task to the wait queue - * @filp: file pointer being polled - * @wait_address: wait_q to block on - * @p: poll state - * - * called by files poll operation to add v9fs-poll task to files wait queue - */ - -static void -p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) -{ - struct p9_conn *m = container_of(p, struct p9_conn, pt); - struct p9_poll_wait *pwait = NULL; - int i; - - for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { - if (m->poll_wait[i].wait_addr == NULL) { - pwait = &m->poll_wait[i]; - break; - } - } - - if (!pwait) { - P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); - return; - } - - if (!wait_address) { - P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); - pwait->wait_addr = ERR_PTR(-EIO); - return; - } - - pwait->conn = m; - pwait->wait_addr = wait_address; - init_waitqueue_func_entry(&pwait->wait, p9_pollwake); - add_wait_queue(wait_address, &pwait->wait); -} - -/** - * p9_poll_mux - polls a mux and schedules read or write works if necessary - * @m: connection to poll - * - */ - -static void p9_poll_mux(struct p9_conn *m) -{ - int n; - - if (m->err < 0) - return; - - n = p9_fd_poll(m->client, NULL); - if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { - P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); - if (n >= 0) - n = -ECONNRESET; - p9_conn_cancel(m, n); - } - - if (n & POLLIN) { - set_bit(Rpending, &m->wsched); - P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); - if (!test_and_set_bit(Rworksched, &m->wsched)) { - P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); - queue_work(p9_mux_wq, &m->rq); - } - } - - if (n & POLLOUT) { - set_bit(Wpending, &m->wsched); - P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); - if ((m->wsize || !list_empty(&m->unsent_req_list)) - && !test_and_set_bit(Wworksched, &m->wsched)) { - P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); - queue_work(p9_mux_wq, &m->wq); - } - } -} - -/** - * p9_poll_proc - poll worker thread - * @a: thread state and arguments - * - * polls all v9fs transports for new events and queues the appropriate - * work to the work queue - * - */ - -static int p9_poll_proc(void *a) -{ - unsigned long flags; - - P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current); - repeat: - spin_lock_irqsave(&p9_poll_lock, flags); - while (!list_empty(&p9_poll_pending_list)) { - struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, - struct p9_conn, - poll_pending_link); - list_del_init(&conn->poll_pending_link); - spin_unlock_irqrestore(&p9_poll_lock, flags); - - p9_poll_mux(conn); - - spin_lock_irqsave(&p9_poll_lock, flags); - } - spin_unlock_irqrestore(&p9_poll_lock, flags); - - set_current_state(TASK_INTERRUPTIBLE); - if (list_empty(&p9_poll_pending_list)) { - P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); - schedule(); - } - __set_current_state(TASK_RUNNING); - - if (!kthread_should_stop()) - goto repeat; - - P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); - return 0; -} - -/** - * p9_write_work - called when a transport can send some data - * @work: container for work to be done + * p9_conn_cancel - cancel all pending requests with error + * @m: mux data + * @err: error code * */ -static void p9_write_work(struct work_struct *work) +void p9_conn_cancel(struct p9_conn *m, int err) { - int n, err; - struct p9_conn *m; - struct p9_req *req; - - m = container_of(work, struct p9_conn, wq); - - if (m->err < 0) { - clear_bit(Wworksched, &m->wsched); - return; - } - - if (!m->wsize) { - if (list_empty(&m->unsent_req_list)) { - clear_bit(Wworksched, &m->wsched); - return; - } - - spin_lock(&m->lock); -again: - req = list_entry(m->unsent_req_list.next, struct p9_req, - req_list); - list_move_tail(&req->req_list, &m->req_list); - if (req->err == ERREQFLUSH) - goto again; - - m->wbuf = req->tcall->sdata; - m->wsize = req->tcall->size; - m->wpos = 0; - spin_unlock(&m->lock); - } + struct p9_req *req, *rtmp; + LIST_HEAD(cancel_list); - P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, - m->wsize); - clear_bit(Wpending, &m->wsched); - err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); - P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); - if (err == -EAGAIN) { - clear_bit(Wworksched, &m->wsched); - return; + P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); + m->err = err; + spin_lock(&m->lock); + list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { + list_move(&req->req_list, &cancel_list); } - - if (err < 0) - goto error; - else if (err == 0) { - err = -EREMOTEIO; - goto error; + list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { + list_move(&req->req_list, &cancel_list); } + spin_unlock(&m->lock); - m->wpos += err; - if (m->wpos == m->wsize) - m->wpos = m->wsize = 0; + list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { + list_del(&req->req_list); + if (!req->err) + req->err = err; - if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { - if (test_and_clear_bit(Wpending, &m->wsched)) - n = POLLOUT; + if (req->cb) + (*req->cb) (req, req->cba); else - n = p9_fd_poll(m->client, NULL); - - if (n & POLLOUT) { - P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); - queue_work(p9_mux_wq, &m->wq); - } else - clear_bit(Wworksched, &m->wsched); - } else - clear_bit(Wworksched, &m->wsched); - - return; - -error: - p9_conn_cancel(m, err); - clear_bit(Wworksched, &m->wsched); + kfree(req->rcall); + } } static void process_request(struct p9_conn *m, struct p9_req *req) @@ -599,6 +314,66 @@ static void process_request(struct p9_conn *m, struct p9_req *req) } } +static unsigned int +p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) +{ + int ret, n; + struct p9_trans_fd *ts = NULL; + + if (client && client->status == Connected) + ts = client->trans; + + if (!ts) + return -EREMOTEIO; + + if (!ts->rd->f_op || !ts->rd->f_op->poll) + return -EIO; + + if (!ts->wr->f_op || !ts->wr->f_op->poll) + return -EIO; + + ret = ts->rd->f_op->poll(ts->rd, pt); + if (ret < 0) + return ret; + + if (ts->rd != ts->wr) { + n = ts->wr->f_op->poll(ts->wr, pt); + if (n < 0) + return n; + ret = (ret & ~POLLOUT) | (n & ~POLLIN); + } + + return ret; +} + +/** + * p9_fd_read- read from a fd + * @client: client instance + * @v: buffer to receive data into + * @len: size of receive buffer + * + */ + +static int p9_fd_read(struct p9_client *client, void *v, int len) +{ + int ret; + struct p9_trans_fd *ts = NULL; + + if (client && client->status != Disconnected) + ts = client->trans; + + if (!ts) + return -EREMOTEIO; + + if (!(ts->rd->f_flags & O_NONBLOCK)) + P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); + + ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); + if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) + client->status = Disconnected; + return ret; +} + /** * p9_read_work - called when there is some data to be read from a transport * @work: container of work to be done @@ -749,6 +524,275 @@ error: } /** + * p9_fd_write - write to a socket + * @client: client instance + * @v: buffer to send data from + * @len: size of send buffer + * + */ + +static int p9_fd_write(struct p9_client *client, void *v, int len) +{ + int ret; + mm_segment_t oldfs; + struct p9_trans_fd *ts = NULL; + + if (client && client->status != Disconnected) + ts = client->trans; + + if (!ts) + return -EREMOTEIO; + + if (!(ts->wr->f_flags & O_NONBLOCK)) + P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); + + oldfs = get_fs(); + set_fs(get_ds()); + /* The cast to a user pointer is valid due to the set_fs() */ + ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); + set_fs(oldfs); + + if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) + client->status = Disconnected; + return ret; +} + +/** + * p9_write_work - called when a transport can send some data + * @work: container for work to be done + * + */ + +static void p9_write_work(struct work_struct *work) +{ + int n, err; + struct p9_conn *m; + struct p9_req *req; + + m = container_of(work, struct p9_conn, wq); + + if (m->err < 0) { + clear_bit(Wworksched, &m->wsched); + return; + } + + if (!m->wsize) { + if (list_empty(&m->unsent_req_list)) { + clear_bit(Wworksched, &m->wsched); + return; + } + + spin_lock(&m->lock); +again: + req = list_entry(m->unsent_req_list.next, struct p9_req, + req_list); + list_move_tail(&req->req_list, &m->req_list); + if (req->err == ERREQFLUSH) + goto again; + + m->wbuf = req->tcall->sdata; + m->wsize = req->tcall->size; + m->wpos = 0; + spin_unlock(&m->lock); + } + + P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, + m->wsize); + clear_bit(Wpending, &m->wsched); + err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); + P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); + if (err == -EAGAIN) { + clear_bit(Wworksched, &m->wsched); + return; + } + + if (err < 0) + goto error; + else if (err == 0) { + err = -EREMOTEIO; + goto error; + } + + m->wpos += err; + if (m->wpos == m->wsize) + m->wpos = m->wsize = 0; + + if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { + if (test_and_clear_bit(Wpending, &m->wsched)) + n = POLLOUT; + else + n = p9_fd_poll(m->client, NULL); + + if (n & POLLOUT) { + P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); + queue_work(p9_mux_wq, &m->wq); + } else + clear_bit(Wworksched, &m->wsched); + } else + clear_bit(Wworksched, &m->wsched); + + return; + +error: + p9_conn_cancel(m, err); + clear_bit(Wworksched, &m->wsched); +} + +static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) +{ + struct p9_poll_wait *pwait = + container_of(wait, struct p9_poll_wait, wait); + struct p9_conn *m = pwait->conn; + unsigned long flags; + DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); + + spin_lock_irqsave(&p9_poll_lock, flags); + if (list_empty(&m->poll_pending_link)) + list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); + spin_unlock_irqrestore(&p9_poll_lock, flags); + + /* perform the default wake up operation */ + return default_wake_function(&dummy_wait, mode, sync, key); +} + +/** + * p9_pollwait - add poll task to the wait queue + * @filp: file pointer being polled + * @wait_address: wait_q to block on + * @p: poll state + * + * called by files poll operation to add v9fs-poll task to files wait queue + */ + +static void +p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) +{ + struct p9_conn *m = container_of(p, struct p9_conn, pt); + struct p9_poll_wait *pwait = NULL; + int i; + + for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { + if (m->poll_wait[i].wait_addr == NULL) { + pwait = &m->poll_wait[i]; + break; + } + } + + if (!pwait) { + P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); + return; + } + + if (!wait_address) { + P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); + pwait->wait_addr = ERR_PTR(-EIO); + return; + } + + pwait->conn = m; + pwait->wait_addr = wait_address; + init_waitqueue_func_entry(&pwait->wait, p9_pollwake); + add_wait_queue(wait_address, &pwait->wait); +} + +/** + * p9_conn_create - allocate and initialize the per-session mux data + * @client: client instance + * + * Note: Creates the polling task if this is the first session. + */ + +static struct p9_conn *p9_conn_create(struct p9_client *client) +{ + int i, n; + struct p9_conn *m; + + P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize); + m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); + if (!m) + return ERR_PTR(-ENOMEM); + + spin_lock_init(&m->lock); + INIT_LIST_HEAD(&m->mux_list); + m->client = client; + m->tagpool = p9_idpool_create(); + if (IS_ERR(m->tagpool)) { + kfree(m); + return ERR_PTR(-ENOMEM); + } + + INIT_LIST_HEAD(&m->req_list); + INIT_LIST_HEAD(&m->unsent_req_list); + INIT_WORK(&m->rq, p9_read_work); + INIT_WORK(&m->wq, p9_write_work); + INIT_LIST_HEAD(&m->poll_pending_link); + init_poll_funcptr(&m->pt, p9_pollwait); + + n = p9_fd_poll(client, &m->pt); + if (n & POLLIN) { + P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); + set_bit(Rpending, &m->wsched); + } + + if (n & POLLOUT) { + P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); + set_bit(Wpending, &m->wsched); + } + + for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { + if (IS_ERR(m->poll_wait[i].wait_addr)) { + p9_mux_poll_stop(m); + kfree(m); + /* return the error code */ + return (void *)m->poll_wait[i].wait_addr; + } + } + + return m; +} + +/** + * p9_poll_mux - polls a mux and schedules read or write works if necessary + * @m: connection to poll + * + */ + +static void p9_poll_mux(struct p9_conn *m) +{ + int n; + + if (m->err < 0) + return; + + n = p9_fd_poll(m->client, NULL); + if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { + P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); + if (n >= 0) + n = -ECONNRESET; + p9_conn_cancel(m, n); + } + + if (n & POLLIN) { + set_bit(Rpending, &m->wsched); + P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); + if (!test_and_set_bit(Rworksched, &m->wsched)) { + P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); + queue_work(p9_mux_wq, &m->rq); + } + } + + if (n & POLLOUT) { + set_bit(Wpending, &m->wsched); + P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); + if ((m->wsize || !list_empty(&m->unsent_req_list)) + && !test_and_set_bit(Wworksched, &m->wsched)) { + P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); + queue_work(p9_mux_wq, &m->wq); + } + } +} + +/** * p9_send_request - send 9P request * The function can sleep until the request is scheduled for sending. * The function can be interrupted. Return from the function is not @@ -1005,69 +1049,6 @@ p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc) return err; } -#ifdef P9_NONBLOCK -/** - * p9_conn_rpcnb - sends 9P request without waiting for response. - * @m: mux data - * @tc: request to be sent - * @cb: callback function to be called when response arrives - * @a: value to pass to the callback function - * - */ - -int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, - p9_conn_req_callback cb, void *a) -{ - int err; - struct p9_req *req; - - req = p9_send_request(m, tc, cb, a); - if (IS_ERR(req)) { - err = PTR_ERR(req); - P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); - return PTR_ERR(req); - } - - P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); - return 0; -} -#endif /* P9_NONBLOCK */ - -/** - * p9_conn_cancel - cancel all pending requests with error - * @m: mux data - * @err: error code - * - */ - -void p9_conn_cancel(struct p9_conn *m, int err) -{ - struct p9_req *req, *rtmp; - LIST_HEAD(cancel_list); - - P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); - m->err = err; - spin_lock(&m->lock); - list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { - list_move(&req->req_list, &cancel_list); - } - list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { - list_move(&req->req_list, &cancel_list); - } - spin_unlock(&m->lock); - - list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { - list_del(&req->req_list); - if (!req->err) - req->err = err; - - if (req->cb) - (*req->cb) (req, req->cba); - else - kfree(req->rcall); - } -} - /** * parse_options - parse mount options into session structure * @options: options string passed from mount @@ -1177,97 +1158,25 @@ static int p9_socket_open(struct p9_client *client, struct socket *csocket) } /** - * p9_fd_read- read from a fd - * @client: client instance - * @v: buffer to receive data into - * @len: size of receive buffer - * - */ - -static int p9_fd_read(struct p9_client *client, void *v, int len) -{ - int ret; - struct p9_trans_fd *ts = NULL; - - if (client && client->status != Disconnected) - ts = client->trans; - - if (!ts) - return -EREMOTEIO; - - if (!(ts->rd->f_flags & O_NONBLOCK)) - P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); - - ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); - if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) - client->status = Disconnected; - return ret; -} - -/** - * p9_fd_write - write to a socket - * @client: client instance - * @v: buffer to send data from - * @len: size of send buffer + * p9_mux_destroy - cancels all pending requests and frees mux resources + * @m: mux to destroy * */ -static int p9_fd_write(struct p9_client *client, void *v, int len) -{ - int ret; - mm_segment_t oldfs; - struct p9_trans_fd *ts = NULL; - - if (client && client->status != Disconnected) - ts = client->trans; - - if (!ts) - return -EREMOTEIO; - - if (!(ts->wr->f_flags & O_NONBLOCK)) - P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); - - oldfs = get_fs(); - set_fs(get_ds()); - /* The cast to a user pointer is valid due to the set_fs() */ - ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); - set_fs(oldfs); - - if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) - client->status = Disconnected; - return ret; -} - -static unsigned int -p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) +static void p9_conn_destroy(struct p9_conn *m) { - int ret, n; - struct p9_trans_fd *ts = NULL; - - if (client && client->status == Connected) - ts = client->trans; - - if (!ts) - return -EREMOTEIO; - - if (!ts->rd->f_op || !ts->rd->f_op->poll) - return -EIO; - - if (!ts->wr->f_op || !ts->wr->f_op->poll) - return -EIO; + P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, + m->mux_list.prev, m->mux_list.next); - ret = ts->rd->f_op->poll(ts->rd, pt); - if (ret < 0) - return ret; + p9_mux_poll_stop(m); + cancel_work_sync(&m->rq); + cancel_work_sync(&m->wq); - if (ts->rd != ts->wr) { - n = ts->wr->f_op->poll(ts->wr, pt); - if (n < 0) - return n; - ret = (ret & ~POLLOUT) | (n & ~POLLIN); - } + p9_conn_cancel(m, -ECONNRESET); - return ret; + m->client = NULL; + p9_idpool_destroy(m->tagpool); + kfree(m); } /** @@ -1492,6 +1401,49 @@ static struct p9_trans_module p9_fd_trans = { .owner = THIS_MODULE, }; +/** + * p9_poll_proc - poll worker thread + * @a: thread state and arguments + * + * polls all v9fs transports for new events and queues the appropriate + * work to the work queue + * + */ + +static int p9_poll_proc(void *a) +{ + unsigned long flags; + + P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current); + repeat: + spin_lock_irqsave(&p9_poll_lock, flags); + while (!list_empty(&p9_poll_pending_list)) { + struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, + struct p9_conn, + poll_pending_link); + list_del_init(&conn->poll_pending_link); + spin_unlock_irqrestore(&p9_poll_lock, flags); + + p9_poll_mux(conn); + + spin_lock_irqsave(&p9_poll_lock, flags); + } + spin_unlock_irqrestore(&p9_poll_lock, flags); + + set_current_state(TASK_INTERRUPTIBLE); + if (list_empty(&p9_poll_pending_list)) { + P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); + schedule(); + } + __set_current_state(TASK_RUNNING); + + if (!kthread_should_stop()) + goto repeat; + + P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); + return 0; +} + int p9_trans_fd_init(void) { p9_mux_wq = create_workqueue("v9fs"); |
