u16 port;
};
-
/**
* struct p9_trans_fd - transport state
* @rd: reference to file to read from
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;
}
/**
- * p9_conn_create - allocate and initialize the per-session mux data
- * @client: client instance
+ * p9_conn_cancel - cancel all pending requests with error
+ * @m: mux data
+ * @err: error code
*
- * Note: Creates the polling task if this is the first session.
*/
-static struct p9_conn *p9_conn_create(struct p9_client *client)
+void p9_conn_cancel(struct p9_conn *m, int err)
{
- 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);
+ struct p9_req *req, *rtmp;
+ LIST_HEAD(cancel_list);
- 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);
+ 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);
- 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);
+ list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
+ list_del(&req->req_list);
+ if (!req->err)
+ req->err = err;
- 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 (req->cb)
+ (*req->cb) (req, req->cba);
+ else
+ kfree(req->rcall);
}
+}
- if (n & POLLOUT) {
- P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
- set_bit(Wpending, &m->wsched);
- }
+static void process_request(struct p9_conn *m, struct p9_req *req)
+{
+ int ecode;
+ struct p9_str *ename;
- 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;
+ if (!req->err && req->rcall->id == P9_RERROR) {
+ ecode = req->rcall->params.rerror.errno;
+ ename = &req->rcall->params.rerror.error;
+
+ P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
+ ename->str);
+
+ if (m->client->dotu)
+ req->err = -ecode;
+
+ if (!req->err) {
+ req->err = p9_errstr2errno(ename->str, ename->len);
+
+ /* string match failed */
+ if (!req->err) {
+ PRINT_FCALL_ERROR("unknown error", req->rcall);
+ req->err = -ESERVERFAULT;
+ }
}
+ } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "fcall mismatch: expected %d, got %d\n",
+ req->tcall->id + 1, req->rcall->id);
+ if (!req->err)
+ req->err = -EIO;
}
-
- 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)
+static unsigned int
+p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
{
- P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
- m->mux_list.prev, m->mux_list.next);
+ int ret, n;
+ struct p9_trans_fd *ts = NULL;
- p9_mux_poll_stop(m);
- cancel_work_sync(&m->rq);
- cancel_work_sync(&m->wq);
+ if (client && client->status == Connected)
+ ts = client->trans;
- p9_conn_cancel(m, -ECONNRESET);
+ if (!ts)
+ return -EREMOTEIO;
- m->client = NULL;
- p9_idpool_destroy(m->tagpool);
- kfree(m);
-}
+ if (!ts->rd->f_op || !ts->rd->f_op->poll)
+ return -EIO;
-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);
+ if (!ts->wr->f_op || !ts->wr->f_op->poll)
+ return -EIO;
- 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);
+ ret = ts->rd->f_op->poll(ts->rd, pt);
+ if (ret < 0)
+ return ret;
- /* perform the default wake up operation */
- return default_wake_function(&dummy_wait, mode, sync, key);
+ 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_pollwait - add poll task to the wait queue
- * @filp: file pointer being polled
- * @wait_address: wait_q to block on
- * @p: poll state
+ * p9_fd_read- read from a fd
+ * @client: client instance
+ * @v: buffer to receive data into
+ * @len: size of receive buffer
*
- * 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)
+static int p9_fd_read(struct p9_client *client, void *v, int len)
{
- struct p9_conn *m = container_of(p, struct p9_conn, pt);
- struct p9_poll_wait *pwait = NULL;
- int i;
+ int ret;
+ struct p9_trans_fd *ts = NULL;
- 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 (client && client->status != Disconnected)
+ ts = client->trans;
- if (!pwait) {
- P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
- return;
- }
+ if (!ts)
+ return -EREMOTEIO;
- if (!wait_address) {
- P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
- pwait->wait_addr = ERR_PTR(-EIO);
- return;
- }
+ if (!(ts->rd->f_flags & O_NONBLOCK))
+ P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
- pwait->conn = m;
- pwait->wait_addr = wait_address;
- init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
- add_wait_queue(wait_address, &pwait->wait);
+ ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
+ if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+ client->status = Disconnected;
+ return ret;
}
/**
- * p9_poll_mux - polls a mux and schedules read or write works if necessary
- * @m: connection to poll
+ * p9_read_work - called when there is some data to be read from a transport
+ * @work: container of work to be done
*
*/
-static void p9_poll_mux(struct p9_conn *m)
+static void p9_read_work(struct work_struct *work)
{
- int n;
+ int n, err;
+ struct p9_conn *m;
+ struct p9_req *req, *rptr, *rreq;
+ struct p9_fcall *rcall;
+ char *rbuf;
+
+ m = container_of(work, struct p9_conn, rq);
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);
- }
+ rcall = NULL;
+ P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
- 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 (!m->rcall) {
+ m->rcall =
+ kmalloc(sizeof(struct p9_fcall) + m->client->msize,
+ GFP_KERNEL);
+ if (!m->rcall) {
+ err = -ENOMEM;
+ goto error;
}
+
+ m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
+ m->rpos = 0;
}
- 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);
- }
+ clear_bit(Rpending, &m->wsched);
+ err = p9_fd_read(m->client, m->rbuf + m->rpos,
+ m->client->msize - m->rpos);
+ P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
+ if (err == -EAGAIN) {
+ clear_bit(Rworksched, &m->wsched);
+ return;
}
-}
-/**
- * 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
+ if (err <= 0)
+ goto error;
+
+ m->rpos += err;
+ while (m->rpos > 4) {
+ n = le32_to_cpu(*(__le32 *) m->rbuf);
+ if (n >= m->client->msize) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "requested packet size too big: %d\n", n);
+ err = -EIO;
+ goto error;
+ }
+
+ if (m->rpos < n)
+ break;
+
+ err =
+ p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
+ if (err < 0)
+ goto error;
+
+#ifdef CONFIG_NET_9P_DEBUG
+ if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
+ char buf[150];
+
+ p9_printfcall(buf, sizeof(buf), m->rcall,
+ m->client->dotu);
+ printk(KERN_NOTICE ">>> %p %s\n", m, buf);
+ }
+#endif
+
+ rcall = m->rcall;
+ rbuf = m->rbuf;
+ if (m->rpos > n) {
+ m->rcall = kmalloc(sizeof(struct p9_fcall) +
+ m->client->msize, GFP_KERNEL);
+ if (!m->rcall) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
+ memmove(m->rbuf, rbuf + n, m->rpos - n);
+ m->rpos -= n;
+ } else {
+ m->rcall = NULL;
+ m->rbuf = NULL;
+ m->rpos = 0;
+ }
+
+ P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
+ rcall->id, rcall->tag);
+
+ req = NULL;
+ spin_lock(&m->lock);
+ list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
+ if (rreq->tag == rcall->tag) {
+ req = rreq;
+ if (req->flush != Flushing)
+ list_del(&req->req_list);
+ break;
+ }
+ }
+ spin_unlock(&m->lock);
+
+ if (req) {
+ req->rcall = rcall;
+ process_request(m, req);
+
+ if (req->flush != Flushing) {
+ if (req->cb)
+ (*req->cb) (req, req->cba);
+ else
+ kfree(req->rcall);
+ }
+ } else {
+ if (err >= 0 && rcall->id != P9_RFLUSH)
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "unexpected response mux %p id %d tag %d\n",
+ m, rcall->id, rcall->tag);
+ kfree(rcall);
+ }
+ }
+
+ if (!list_empty(&m->req_list)) {
+ if (test_and_clear_bit(Rpending, &m->wsched))
+ n = POLLIN;
+ else
+ n = p9_fd_poll(m->client, NULL);
+
+ if (n & POLLIN) {
+ P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
+ queue_work(p9_mux_wq, &m->rq);
+ } else
+ clear_bit(Rworksched, &m->wsched);
+ } else
+ clear_bit(Rworksched, &m->wsched);
+
+ return;
+
+error:
+ p9_conn_cancel(m, err);
+ clear_bit(Rworksched, &m->wsched);
+}
+
+/**
+ * p9_fd_write - write to a socket
+ * @client: client instance
+ * @v: buffer to send data from
+ * @len: size of send buffer
*
*/
-static int p9_poll_proc(void *a)
+static int p9_fd_write(struct p9_client *client, void *v, int len)
{
- 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);
+ int ret;
+ mm_segment_t oldfs;
+ struct p9_trans_fd *ts = NULL;
- p9_poll_mux(conn);
+ if (client && client->status != Disconnected)
+ ts = client->trans;
- spin_lock_irqsave(&p9_poll_lock, flags);
- }
- spin_unlock_irqrestore(&p9_poll_lock, flags);
+ if (!ts)
+ return -EREMOTEIO;
- 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 (!(ts->wr->f_flags & O_NONBLOCK))
+ P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
- if (!kthread_should_stop())
- goto repeat;
+ 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);
- P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
- return 0;
+ if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+ client->status = Disconnected;
+ return ret;
}
/**
clear_bit(Wworksched, &m->wsched);
}
-static void process_request(struct p9_conn *m, struct p9_req *req)
+static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
{
- int ecode;
- struct p9_str *ename;
-
- if (!req->err && req->rcall->id == P9_RERROR) {
- ecode = req->rcall->params.rerror.errno;
- ename = &req->rcall->params.rerror.error;
-
- P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
- ename->str);
-
- if (m->client->dotu)
- req->err = -ecode;
+ 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);
- if (!req->err) {
- req->err = p9_errstr2errno(ename->str, ename->len);
+ 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);
- /* string match failed */
- if (!req->err) {
- PRINT_FCALL_ERROR("unknown error", req->rcall);
- req->err = -ESERVERFAULT;
- }
- }
- } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
- P9_DPRINTK(P9_DEBUG_ERROR,
- "fcall mismatch: expected %d, got %d\n",
- req->tcall->id + 1, req->rcall->id);
- if (!req->err)
- req->err = -EIO;
- }
+ /* perform the default wake up operation */
+ return default_wake_function(&dummy_wait, mode, sync, key);
}
/**
- * p9_read_work - called when there is some data to be read from a transport
- * @work: container of work to be done
+ * 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_read_work(struct work_struct *work)
+static void
+p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
{
- int n, err;
- struct p9_conn *m;
- struct p9_req *req, *rptr, *rreq;
- struct p9_fcall *rcall;
- char *rbuf;
-
- m = container_of(work, struct p9_conn, rq);
-
- if (m->err < 0)
- return;
-
- rcall = NULL;
- P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
+ struct p9_conn *m = container_of(p, struct p9_conn, pt);
+ struct p9_poll_wait *pwait = NULL;
+ int i;
- if (!m->rcall) {
- m->rcall =
- kmalloc(sizeof(struct p9_fcall) + m->client->msize,
- GFP_KERNEL);
- if (!m->rcall) {
- err = -ENOMEM;
- goto error;
+ for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
+ if (m->poll_wait[i].wait_addr == NULL) {
+ pwait = &m->poll_wait[i];
+ break;
}
-
- m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
- m->rpos = 0;
}
- clear_bit(Rpending, &m->wsched);
- err = p9_fd_read(m->client, m->rbuf + m->rpos,
- m->client->msize - m->rpos);
- P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
- if (err == -EAGAIN) {
- clear_bit(Rworksched, &m->wsched);
+ if (!pwait) {
+ P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
return;
}
- if (err <= 0)
- goto error;
-
- m->rpos += err;
- while (m->rpos > 4) {
- n = le32_to_cpu(*(__le32 *) m->rbuf);
- if (n >= m->client->msize) {
- P9_DPRINTK(P9_DEBUG_ERROR,
- "requested packet size too big: %d\n", n);
- err = -EIO;
- goto error;
- }
-
- if (m->rpos < n)
- break;
-
- err =
- p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
- if (err < 0)
- goto error;
+ if (!wait_address) {
+ P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
+ pwait->wait_addr = ERR_PTR(-EIO);
+ return;
+ }
-#ifdef CONFIG_NET_9P_DEBUG
- if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
- char buf[150];
+ pwait->conn = m;
+ pwait->wait_addr = wait_address;
+ init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
+ add_wait_queue(wait_address, &pwait->wait);
+}
- p9_printfcall(buf, sizeof(buf), m->rcall,
- m->client->dotu);
- printk(KERN_NOTICE ">>> %p %s\n", m, buf);
- }
-#endif
+/**
+ * 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.
+ */
- rcall = m->rcall;
- rbuf = m->rbuf;
- if (m->rpos > n) {
- m->rcall = kmalloc(sizeof(struct p9_fcall) +
- m->client->msize, GFP_KERNEL);
- if (!m->rcall) {
- err = -ENOMEM;
- goto error;
- }
+static struct p9_conn *p9_conn_create(struct p9_client *client)
+{
+ int i, n;
+ struct p9_conn *m;
- m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
- memmove(m->rbuf, rbuf + n, m->rpos - n);
- m->rpos -= n;
- } else {
- m->rcall = NULL;
- m->rbuf = NULL;
- m->rpos = 0;
- }
+ 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);
- P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
- rcall->id, rcall->tag);
+ 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);
+ }
- req = NULL;
- spin_lock(&m->lock);
- list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
- if (rreq->tag == rcall->tag) {
- req = rreq;
- if (req->flush != Flushing)
- list_del(&req->req_list);
- break;
- }
- }
- spin_unlock(&m->lock);
+ 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);
- if (req) {
- req->rcall = rcall;
- process_request(m, req);
+ 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 (req->flush != Flushing) {
- if (req->cb)
- (*req->cb) (req, req->cba);
- else
- kfree(req->rcall);
- }
- } else {
- if (err >= 0 && rcall->id != P9_RFLUSH)
- P9_DPRINTK(P9_DEBUG_ERROR,
- "unexpected response mux %p id %d tag %d\n",
- m, rcall->id, rcall->tag);
- kfree(rcall);
+ 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;
}
}
- if (!list_empty(&m->req_list)) {
- if (test_and_clear_bit(Rpending, &m->wsched))
- n = POLLIN;
- else
- n = p9_fd_poll(m->client, NULL);
+ return m;
+}
- if (n & POLLIN) {
+/**
+ * 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);
- } else
- clear_bit(Rworksched, &m->wsched);
- } else
- clear_bit(Rworksched, &m->wsched);
-
- return;
+ }
+ }
-error:
- p9_conn_cancel(m, err);
- clear_bit(Rworksched, &m->wsched);
+ 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);
+ }
+ }
}
/**
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
}
/**
- * 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);
}
/**
.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");
projects / kernel / kernel-generic.git / commitdiff