| /* |
| * linux/fs/9p/trans_fd.c |
| * |
| * Fd transport layer. Includes deprecated socket layer. |
| * |
| * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> |
| * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
| * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to: |
| * Free Software Foundation |
| * 51 Franklin Street, Fifth Floor |
| * Boston, MA 02111-1301 USA |
| * |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/in.h> |
| #include <linux/module.h> |
| #include <linux/net.h> |
| #include <linux/ipv6.h> |
| #include <linux/kthread.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/un.h> |
| #include <linux/uaccess.h> |
| #include <linux/inet.h> |
| #include <linux/idr.h> |
| #include <linux/file.h> |
| #include <linux/parser.h> |
| #include <linux/slab.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/client.h> |
| #include <net/9p/transport.h> |
| |
| #include <linux/syscalls.h> /* killme */ |
| |
| #define P9_PORT 564 |
| #define MAX_SOCK_BUF (64*1024) |
| #define MAXPOLLWADDR 2 |
| |
| /** |
| * struct p9_fd_opts - per-transport options |
| * @rfd: file descriptor for reading (trans=fd) |
| * @wfd: file descriptor for writing (trans=fd) |
| * @port: port to connect to (trans=tcp) |
| * |
| */ |
| |
| struct p9_fd_opts { |
| int rfd; |
| int wfd; |
| u16 port; |
| }; |
| |
| /** |
| * struct p9_trans_fd - transport state |
| * @rd: reference to file to read from |
| * @wr: reference of file to write to |
| * @conn: connection state reference |
| * |
| */ |
| |
| struct p9_trans_fd { |
| struct file *rd; |
| struct file *wr; |
| struct p9_conn *conn; |
| }; |
| |
| /* |
| * Option Parsing (code inspired by NFS code) |
| * - a little lazy - parse all fd-transport options |
| */ |
| |
| enum { |
| /* Options that take integer arguments */ |
| Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
| }; |
| |
| static const match_table_t tokens = { |
| {Opt_port, "port=%u"}, |
| {Opt_rfdno, "rfdno=%u"}, |
| {Opt_wfdno, "wfdno=%u"}, |
| {Opt_err, NULL}, |
| }; |
| |
| enum { |
| Rworksched = 1, /* read work scheduled or running */ |
| Rpending = 2, /* can read */ |
| Wworksched = 4, /* write work scheduled or running */ |
| Wpending = 8, /* can write */ |
| }; |
| |
| struct p9_poll_wait { |
| struct p9_conn *conn; |
| wait_queue_t wait; |
| wait_queue_head_t *wait_addr; |
| }; |
| |
| /** |
| * struct p9_conn - fd mux connection state information |
| * @mux_list: list link for mux to manage multiple connections (?) |
| * @client: reference to client instance for this connection |
| * @err: error state |
| * @req_list: accounting for requests which have been sent |
| * @unsent_req_list: accounting for requests that haven't been sent |
| * @req: current request being processed (if any) |
| * @tmp_buf: temporary buffer to read in header |
| * @rsize: amount to read for current frame |
| * @rpos: read position in current frame |
| * @rbuf: current read buffer |
| * @wpos: write position for current frame |
| * @wsize: amount of data to write for current frame |
| * @wbuf: current write buffer |
| * @poll_pending_link: pending links to be polled per conn |
| * @poll_wait: array of wait_q's for various worker threads |
| * @pt: poll state |
| * @rq: current read work |
| * @wq: current write work |
| * @wsched: ???? |
| * |
| */ |
| |
| struct p9_conn { |
| struct list_head mux_list; |
| struct p9_client *client; |
| int err; |
| struct list_head req_list; |
| struct list_head unsent_req_list; |
| struct p9_req_t *req; |
| char tmp_buf[7]; |
| int rsize; |
| int rpos; |
| char *rbuf; |
| int wpos; |
| int wsize; |
| char *wbuf; |
| struct list_head poll_pending_link; |
| struct p9_poll_wait poll_wait[MAXPOLLWADDR]; |
| poll_table pt; |
| struct work_struct rq; |
| struct work_struct wq; |
| unsigned long wsched; |
| }; |
| |
| static void p9_poll_workfn(struct work_struct *work); |
| |
| static DEFINE_SPINLOCK(p9_poll_lock); |
| static LIST_HEAD(p9_poll_pending_list); |
| static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
| |
| static void p9_mux_poll_stop(struct p9_conn *m) |
| { |
| unsigned long flags; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
| struct p9_poll_wait *pwait = &m->poll_wait[i]; |
| |
| if (pwait->wait_addr) { |
| remove_wait_queue(pwait->wait_addr, &pwait->wait); |
| pwait->wait_addr = NULL; |
| } |
| } |
| |
| spin_lock_irqsave(&p9_poll_lock, flags); |
| list_del_init(&m->poll_pending_link); |
| spin_unlock_irqrestore(&p9_poll_lock, flags); |
| } |
| |
| /** |
| * p9_conn_cancel - cancel all pending requests with error |
| * @m: mux data |
| * @err: error code |
| * |
| */ |
| |
| static void p9_conn_cancel(struct p9_conn *m, int err) |
| { |
| struct p9_req_t *req, *rtmp; |
| unsigned long flags; |
| LIST_HEAD(cancel_list); |
| |
| p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
| |
| spin_lock_irqsave(&m->client->lock, flags); |
| |
| if (m->err) { |
| spin_unlock_irqrestore(&m->client->lock, flags); |
| return; |
| } |
| |
| m->err = err; |
| |
| list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
| req->status = REQ_STATUS_ERROR; |
| if (!req->t_err) |
| req->t_err = err; |
| list_move(&req->req_list, &cancel_list); |
| } |
| list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
| req->status = REQ_STATUS_ERROR; |
| if (!req->t_err) |
| req->t_err = err; |
| list_move(&req->req_list, &cancel_list); |
| } |
| spin_unlock_irqrestore(&m->client->lock, flags); |
| |
| list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
| p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
| list_del(&req->req_list); |
| p9_client_cb(m->client, req); |
| } |
| } |
| |
| static 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_debug(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 |
| * |
| */ |
| |
| static void p9_read_work(struct work_struct *work) |
| { |
| int n, err; |
| struct p9_conn *m; |
| |
| m = container_of(work, struct p9_conn, rq); |
| |
| if (m->err < 0) |
| return; |
| |
| p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
| |
| if (!m->rbuf) { |
| m->rbuf = m->tmp_buf; |
| m->rpos = 0; |
| m->rsize = 7; /* start by reading header */ |
| } |
| |
| clear_bit(Rpending, &m->wsched); |
| p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", |
| m, m->rpos, m->rsize, m->rsize-m->rpos); |
| err = p9_fd_read(m->client, m->rbuf + m->rpos, |
| m->rsize - m->rpos); |
| p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
| if (err == -EAGAIN) { |
| clear_bit(Rworksched, &m->wsched); |
| return; |
| } |
| |
| if (err <= 0) |
| goto error; |
| |
| m->rpos += err; |
| |
| if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ |
| u16 tag; |
| p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
| |
| n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ |
| if (n >= m->client->msize) { |
| p9_debug(P9_DEBUG_ERROR, |
| "requested packet size too big: %d\n", n); |
| err = -EIO; |
| goto error; |
| } |
| |
| tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
| p9_debug(P9_DEBUG_TRANS, |
| "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); |
| |
| m->req = p9_tag_lookup(m->client, tag); |
| if (!m->req || (m->req->status != REQ_STATUS_SENT && |
| m->req->status != REQ_STATUS_FLSH)) { |
| p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
| tag); |
| err = -EIO; |
| goto error; |
| } |
| |
| if (m->req->rc == NULL) { |
| m->req->rc = kmalloc(sizeof(struct p9_fcall) + |
| m->client->msize, GFP_NOFS); |
| if (!m->req->rc) { |
| m->req = NULL; |
| err = -ENOMEM; |
| goto error; |
| } |
| } |
| m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); |
| memcpy(m->rbuf, m->tmp_buf, m->rsize); |
| m->rsize = n; |
| } |
| |
| /* not an else because some packets (like clunk) have no payload */ |
| if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ |
| p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
| spin_lock(&m->client->lock); |
| if (m->req->status != REQ_STATUS_ERROR) |
| m->req->status = REQ_STATUS_RCVD; |
| list_del(&m->req->req_list); |
| spin_unlock(&m->client->lock); |
| p9_client_cb(m->client, m->req); |
| m->rbuf = NULL; |
| m->rpos = 0; |
| m->rsize = 0; |
| m->req = NULL; |
| } |
| |
| 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_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
| schedule_work(&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_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_debug(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, (__force 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_t *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->client->lock); |
| req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
| req_list); |
| req->status = REQ_STATUS_SENT; |
| p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
| list_move_tail(&req->req_list, &m->req_list); |
| |
| m->wbuf = req->tc->sdata; |
| m->wsize = req->tc->size; |
| m->wpos = 0; |
| spin_unlock(&m->client->lock); |
| } |
| |
| p9_debug(P9_DEBUG_TRANS, "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_debug(P9_DEBUG_TRANS, "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_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
| schedule_work(&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 int 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; |
| |
| 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); |
| |
| schedule_work(&p9_poll_work); |
| return 1; |
| } |
| |
| /** |
| * 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_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
| 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 n; |
| struct p9_conn *m; |
| |
| p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
| m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
| if (!m) |
| return ERR_PTR(-ENOMEM); |
| |
| INIT_LIST_HEAD(&m->mux_list); |
| m->client = client; |
| |
| 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_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
| set_bit(Rpending, &m->wsched); |
| } |
| |
| if (n & POLLOUT) { |
| p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
| set_bit(Wpending, &m->wsched); |
| } |
| |
| 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_debug(P9_DEBUG_TRANS, "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_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
| if (!test_and_set_bit(Rworksched, &m->wsched)) { |
| p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
| schedule_work(&m->rq); |
| } |
| } |
| |
| if (n & POLLOUT) { |
| set_bit(Wpending, &m->wsched); |
| p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
| if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
| !test_and_set_bit(Wworksched, &m->wsched)) { |
| p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
| schedule_work(&m->wq); |
| } |
| } |
| } |
| |
| /** |
| * p9_fd_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 |
| * a guarantee that the request is sent successfully. |
| * |
| * @client: client instance |
| * @req: request to be sent |
| * |
| */ |
| |
| static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
| { |
| int n; |
| struct p9_trans_fd *ts = client->trans; |
| struct p9_conn *m = ts->conn; |
| |
| p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
| m, current, req->tc, req->tc->id); |
| if (m->err < 0) |
| return m->err; |
| |
| spin_lock(&client->lock); |
| req->status = REQ_STATUS_UNSENT; |
| list_add_tail(&req->req_list, &m->unsent_req_list); |
| spin_unlock(&client->lock); |
| |
| if (test_and_clear_bit(Wpending, &m->wsched)) |
| n = POLLOUT; |
| else |
| n = p9_fd_poll(m->client, NULL); |
| |
| if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
| schedule_work(&m->wq); |
| |
| return 0; |
| } |
| |
| static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
| { |
| int ret = 1; |
| |
| p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
| |
| spin_lock(&client->lock); |
| |
| if (req->status == REQ_STATUS_UNSENT) { |
| list_del(&req->req_list); |
| req->status = REQ_STATUS_FLSHD; |
| ret = 0; |
| } else if (req->status == REQ_STATUS_SENT) |
| req->status = REQ_STATUS_FLSH; |
| |
| spin_unlock(&client->lock); |
| |
| return ret; |
| } |
| |
| /** |
| * parse_opts - parse mount options into p9_fd_opts structure |
| * @params: options string passed from mount |
| * @opts: fd transport-specific structure to parse options into |
| * |
| * Returns 0 upon success, -ERRNO upon failure |
| */ |
| |
| static int parse_opts(char *params, struct p9_fd_opts *opts) |
| { |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int option; |
| char *options, *tmp_options; |
| |
| opts->port = P9_PORT; |
| opts->rfd = ~0; |
| opts->wfd = ~0; |
| |
| if (!params) |
| return 0; |
| |
| tmp_options = kstrdup(params, GFP_KERNEL); |
| if (!tmp_options) { |
| p9_debug(P9_DEBUG_ERROR, |
| "failed to allocate copy of option string\n"); |
| return -ENOMEM; |
| } |
| options = tmp_options; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token; |
| int r; |
| if (!*p) |
| continue; |
| token = match_token(p, tokens, args); |
| if (token != Opt_err) { |
| r = match_int(&args[0], &option); |
| if (r < 0) { |
| p9_debug(P9_DEBUG_ERROR, |
| "integer field, but no integer?\n"); |
| continue; |
| } |
| } |
| switch (token) { |
| case Opt_port: |
| opts->port = option; |
| break; |
| case Opt_rfdno: |
| opts->rfd = option; |
| break; |
| case Opt_wfdno: |
| opts->wfd = option; |
| break; |
| default: |
| continue; |
| } |
| } |
| |
| kfree(tmp_options); |
| return 0; |
| } |
| |
| static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
| { |
| struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
| GFP_KERNEL); |
| if (!ts) |
| return -ENOMEM; |
| |
| ts->rd = fget(rfd); |
| ts->wr = fget(wfd); |
| if (!ts->rd || !ts->wr) { |
| if (ts->rd) |
| fput(ts->rd); |
| if (ts->wr) |
| fput(ts->wr); |
| kfree(ts); |
| return -EIO; |
| } |
| |
| client->trans = ts; |
| client->status = Connected; |
| |
| return 0; |
| } |
| |
| static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
| { |
| struct p9_trans_fd *p; |
| int ret, fd; |
| |
| p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| csocket->sk->sk_allocation = GFP_NOIO; |
| fd = sock_map_fd(csocket, 0); |
| if (fd < 0) { |
| pr_err("%s (%d): failed to map fd\n", |
| __func__, task_pid_nr(current)); |
| sock_release(csocket); |
| kfree(p); |
| return fd; |
| } |
| |
| get_file(csocket->file); |
| get_file(csocket->file); |
| p->wr = p->rd = csocket->file; |
| client->trans = p; |
| client->status = Connected; |
| |
| sys_close(fd); /* still racy */ |
| |
| p->rd->f_flags |= O_NONBLOCK; |
| |
| p->conn = p9_conn_create(client); |
| if (IS_ERR(p->conn)) { |
| ret = PTR_ERR(p->conn); |
| p->conn = NULL; |
| kfree(p); |
| sockfd_put(csocket); |
| sockfd_put(csocket); |
| return ret; |
| } |
| return 0; |
| } |
| |
| /** |
| * 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_debug(P9_DEBUG_TRANS, "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; |
| kfree(m); |
| } |
| |
| /** |
| * p9_fd_close - shutdown file descriptor transport |
| * @client: client instance |
| * |
| */ |
| |
| static void p9_fd_close(struct p9_client *client) |
| { |
| struct p9_trans_fd *ts; |
| |
| if (!client) |
| return; |
| |
| ts = client->trans; |
| if (!ts) |
| return; |
| |
| client->status = Disconnected; |
| |
| p9_conn_destroy(ts->conn); |
| |
| if (ts->rd) |
| fput(ts->rd); |
| if (ts->wr) |
| fput(ts->wr); |
| |
| kfree(ts); |
| } |
| |
| /* |
| * stolen from NFS - maybe should be made a generic function? |
| */ |
| static inline int valid_ipaddr4(const char *buf) |
| { |
| int rc, count, in[4]; |
| |
| rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
| if (rc != 4) |
| return -EINVAL; |
| for (count = 0; count < 4; count++) { |
| if (in[count] > 255) |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int |
| p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) |
| { |
| int err; |
| struct socket *csocket; |
| struct sockaddr_in sin_server; |
| struct p9_fd_opts opts; |
| |
| err = parse_opts(args, &opts); |
| if (err < 0) |
| return err; |
| |
| if (valid_ipaddr4(addr) < 0) |
| return -EINVAL; |
| |
| csocket = NULL; |
| |
| sin_server.sin_family = AF_INET; |
| sin_server.sin_addr.s_addr = in_aton(addr); |
| sin_server.sin_port = htons(opts.port); |
| err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_INET, |
| SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
| if (err) { |
| pr_err("%s (%d): problem creating socket\n", |
| __func__, task_pid_nr(current)); |
| return err; |
| } |
| |
| err = csocket->ops->connect(csocket, |
| (struct sockaddr *)&sin_server, |
| sizeof(struct sockaddr_in), 0); |
| if (err < 0) { |
| pr_err("%s (%d): problem connecting socket to %s\n", |
| __func__, task_pid_nr(current), addr); |
| sock_release(csocket); |
| return err; |
| } |
| |
| return p9_socket_open(client, csocket); |
| } |
| |
| static int |
| p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) |
| { |
| int err; |
| struct socket *csocket; |
| struct sockaddr_un sun_server; |
| |
| csocket = NULL; |
| |
| if (strlen(addr) >= UNIX_PATH_MAX) { |
| pr_err("%s (%d): address too long: %s\n", |
| __func__, task_pid_nr(current), addr); |
| return -ENAMETOOLONG; |
| } |
| |
| sun_server.sun_family = PF_UNIX; |
| strcpy(sun_server.sun_path, addr); |
| err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_UNIX, |
| SOCK_STREAM, 0, &csocket, 1); |
| if (err < 0) { |
| pr_err("%s (%d): problem creating socket\n", |
| __func__, task_pid_nr(current)); |
| |
| return err; |
| } |
| err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| sizeof(struct sockaddr_un) - 1, 0); |
| if (err < 0) { |
| pr_err("%s (%d): problem connecting socket: %s: %d\n", |
| __func__, task_pid_nr(current), addr, err); |
| sock_release(csocket); |
| return err; |
| } |
| |
| return p9_socket_open(client, csocket); |
| } |
| |
| static int |
| p9_fd_create(struct p9_client *client, const char *addr, char *args) |
| { |
| int err; |
| struct p9_fd_opts opts; |
| struct p9_trans_fd *p; |
| |
| parse_opts(args, &opts); |
| |
| if (opts.rfd == ~0 || opts.wfd == ~0) { |
| pr_err("Insufficient options for proto=fd\n"); |
| return -ENOPROTOOPT; |
| } |
| |
| err = p9_fd_open(client, opts.rfd, opts.wfd); |
| if (err < 0) |
| return err; |
| |
| p = (struct p9_trans_fd *) client->trans; |
| p->conn = p9_conn_create(client); |
| if (IS_ERR(p->conn)) { |
| err = PTR_ERR(p->conn); |
| p->conn = NULL; |
| fput(p->rd); |
| fput(p->wr); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static struct p9_trans_module p9_tcp_trans = { |
| .name = "tcp", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 1, |
| .create = p9_fd_create_tcp, |
| .close = p9_fd_close, |
| .request = p9_fd_request, |
| .cancel = p9_fd_cancel, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct p9_trans_module p9_unix_trans = { |
| .name = "unix", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 0, |
| .create = p9_fd_create_unix, |
| .close = p9_fd_close, |
| .request = p9_fd_request, |
| .cancel = p9_fd_cancel, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct p9_trans_module p9_fd_trans = { |
| .name = "fd", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 0, |
| .create = p9_fd_create, |
| .close = p9_fd_close, |
| .request = p9_fd_request, |
| .cancel = p9_fd_cancel, |
| .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 void p9_poll_workfn(struct work_struct *work) |
| { |
| unsigned long flags; |
| |
| p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
| |
| 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); |
| |
| p9_debug(P9_DEBUG_TRANS, "finish\n"); |
| } |
| |
| int p9_trans_fd_init(void) |
| { |
| v9fs_register_trans(&p9_tcp_trans); |
| v9fs_register_trans(&p9_unix_trans); |
| v9fs_register_trans(&p9_fd_trans); |
| |
| return 0; |
| } |
| |
| void p9_trans_fd_exit(void) |
| { |
| flush_work(&p9_poll_work); |
| v9fs_unregister_trans(&p9_tcp_trans); |
| v9fs_unregister_trans(&p9_unix_trans); |
| v9fs_unregister_trans(&p9_fd_trans); |
| } |