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-rw-r--r--net/9p/client.c183
-rw-r--r--net/9p/trans_fd.c860
2 files changed, 495 insertions, 548 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index f1a52a7..712d4f3 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -36,10 +36,6 @@
#include <net/9p/client.h>
#include <net/9p/transport.h>
-static struct p9_fid *p9_fid_create(struct p9_client *clnt);
-static void p9_fid_destroy(struct p9_fid *fid);
-static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
-
/*
* Client Option Parsing (code inspired by NFS code)
* - a little lazy - parse all client options
@@ -124,6 +120,55 @@ static int parse_opts(char *opts, struct p9_client *clnt)
return ret;
}
+static struct p9_fid *p9_fid_create(struct p9_client *clnt)
+{
+ int err;
+ struct p9_fid *fid;
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+ fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
+ if (!fid)
+ return ERR_PTR(-ENOMEM);
+
+ fid->fid = p9_idpool_get(clnt->fidpool);
+ if (fid->fid < 0) {
+ err = -ENOSPC;
+ goto error;
+ }
+
+ memset(&fid->qid, 0, sizeof(struct p9_qid));
+ fid->mode = -1;
+ fid->rdir_fpos = 0;
+ fid->rdir_pos = 0;
+ fid->rdir_fcall = NULL;
+ fid->uid = current->fsuid;
+ fid->clnt = clnt;
+ fid->aux = NULL;
+
+ spin_lock(&clnt->lock);
+ list_add(&fid->flist, &clnt->fidlist);
+ spin_unlock(&clnt->lock);
+
+ return fid;
+
+error:
+ kfree(fid);
+ return ERR_PTR(err);
+}
+
+static void p9_fid_destroy(struct p9_fid *fid)
+{
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ clnt = fid->clnt;
+ p9_idpool_put(fid->fid, clnt->fidpool);
+ spin_lock(&clnt->lock);
+ list_del(&fid->flist);
+ spin_unlock(&clnt->lock);
+ kfree(fid->rdir_fcall);
+ kfree(fid);
+}
/**
* p9_client_rpc - sends 9P request and waits until a response is available.
@@ -815,6 +860,46 @@ int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
}
EXPORT_SYMBOL(p9_client_readn);
+static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
+{
+ int n;
+ char *p;
+ struct p9_stat *ret;
+
+ n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
+ st->muid.len;
+
+ if (dotu)
+ n += st->extension.len;
+
+ ret = kmalloc(n, GFP_KERNEL);
+ if (!ret)
+ return ERR_PTR(-ENOMEM);
+
+ memmove(ret, st, sizeof(struct p9_stat));
+ p = ((char *) ret) + sizeof(struct p9_stat);
+ memmove(p, st->name.str, st->name.len);
+ ret->name.str = p;
+ p += st->name.len;
+ memmove(p, st->uid.str, st->uid.len);
+ ret->uid.str = p;
+ p += st->uid.len;
+ memmove(p, st->gid.str, st->gid.len);
+ ret->gid.str = p;
+ p += st->gid.len;
+ memmove(p, st->muid.str, st->muid.len);
+ ret->muid.str = p;
+ p += st->muid.len;
+
+ if (dotu) {
+ memmove(p, st->extension.str, st->extension.len);
+ ret->extension.str = p;
+ p += st->extension.len;
+ }
+
+ return ret;
+}
+
struct p9_stat *p9_client_stat(struct p9_fid *fid)
{
int err;
@@ -986,93 +1071,3 @@ error:
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_dirread);
-
-static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
-{
- int n;
- char *p;
- struct p9_stat *ret;
-
- n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
- st->muid.len;
-
- if (dotu)
- n += st->extension.len;
-
- ret = kmalloc(n, GFP_KERNEL);
- if (!ret)
- return ERR_PTR(-ENOMEM);
-
- memmove(ret, st, sizeof(struct p9_stat));
- p = ((char *) ret) + sizeof(struct p9_stat);
- memmove(p, st->name.str, st->name.len);
- ret->name.str = p;
- p += st->name.len;
- memmove(p, st->uid.str, st->uid.len);
- ret->uid.str = p;
- p += st->uid.len;
- memmove(p, st->gid.str, st->gid.len);
- ret->gid.str = p;
- p += st->gid.len;
- memmove(p, st->muid.str, st->muid.len);
- ret->muid.str = p;
- p += st->muid.len;
-
- if (dotu) {
- memmove(p, st->extension.str, st->extension.len);
- ret->extension.str = p;
- p += st->extension.len;
- }
-
- return ret;
-}
-
-static struct p9_fid *p9_fid_create(struct p9_client *clnt)
-{
- int err;
- struct p9_fid *fid;
-
- P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
- fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
- if (!fid)
- return ERR_PTR(-ENOMEM);
-
- fid->fid = p9_idpool_get(clnt->fidpool);
- if (fid->fid < 0) {
- err = -ENOSPC;
- goto error;
- }
-
- memset(&fid->qid, 0, sizeof(struct p9_qid));
- fid->mode = -1;
- fid->rdir_fpos = 0;
- fid->rdir_pos = 0;
- fid->rdir_fcall = NULL;
- fid->uid = current->fsuid;
- fid->clnt = clnt;
- fid->aux = NULL;
-
- spin_lock(&clnt->lock);
- list_add(&fid->flist, &clnt->fidlist);
- spin_unlock(&clnt->lock);
-
- return fid;
-
-error:
- kfree(fid);
- return ERR_PTR(err);
-}
-
-static void p9_fid_destroy(struct p9_fid *fid)
-{
- struct p9_client *clnt;
-
- P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
- clnt = fid->clnt;
- p9_idpool_put(fid->fid, clnt->fidpool);
- spin_lock(&clnt->lock);
- list_del(&fid->flist);
- spin_unlock(&clnt->lock);
- kfree(fid->rdir_fcall);
- kfree(fid);
-}
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index bc5b696..334d39c 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");
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