Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/trans_fd.c |
| 3 | * |
| 4 | * Fd transport layer. Includes deprecated socket layer. |
| 5 | * |
| 6 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> |
| 7 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 8 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 9 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 |
| 13 | * as published by the Free Software Foundation. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to: |
| 22 | * Free Software Foundation |
| 23 | * 51 Franklin Street, Fifth Floor |
| 24 | * Boston, MA 02111-1301 USA |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <linux/in.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/net.h> |
| 31 | #include <linux/ipv6.h> |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 32 | #include <linux/kthread.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 33 | #include <linux/errno.h> |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/un.h> |
| 36 | #include <linux/uaccess.h> |
| 37 | #include <linux/inet.h> |
| 38 | #include <linux/idr.h> |
| 39 | #include <linux/file.h> |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 40 | #include <linux/parser.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 41 | #include <net/9p/9p.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 42 | #include <net/9p/client.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 43 | #include <net/9p/transport.h> |
| 44 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 45 | #include <linux/syscalls.h> /* killme */ |
| 46 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 47 | #define P9_PORT 564 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 48 | #define MAX_SOCK_BUF (64*1024) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 49 | #define MAXPOLLWADDR 2 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 50 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 51 | /** |
| 52 | * struct p9_fd_opts - per-transport options |
| 53 | * @rfd: file descriptor for reading (trans=fd) |
| 54 | * @wfd: file descriptor for writing (trans=fd) |
| 55 | * @port: port to connect to (trans=tcp) |
| 56 | * |
| 57 | */ |
| 58 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 59 | struct p9_fd_opts { |
| 60 | int rfd; |
| 61 | int wfd; |
| 62 | u16 port; |
| 63 | }; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 64 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 65 | /** |
| 66 | * struct p9_trans_fd - transport state |
| 67 | * @rd: reference to file to read from |
| 68 | * @wr: reference of file to write to |
| 69 | * @conn: connection state reference |
| 70 | * |
| 71 | */ |
| 72 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 73 | struct p9_trans_fd { |
| 74 | struct file *rd; |
| 75 | struct file *wr; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 76 | struct p9_conn *conn; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 77 | }; |
| 78 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 79 | /* |
| 80 | * Option Parsing (code inspired by NFS code) |
| 81 | * - a little lazy - parse all fd-transport options |
| 82 | */ |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 83 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 84 | enum { |
| 85 | /* Options that take integer arguments */ |
Latchesar Ionkov | 5576269 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 86 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 87 | }; |
| 88 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 89 | static const match_table_t tokens = { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 90 | {Opt_port, "port=%u"}, |
| 91 | {Opt_rfdno, "rfdno=%u"}, |
| 92 | {Opt_wfdno, "wfdno=%u"}, |
Latchesar Ionkov | 5576269 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 93 | {Opt_err, NULL}, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 94 | }; |
| 95 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 96 | enum { |
| 97 | Rworksched = 1, /* read work scheduled or running */ |
| 98 | Rpending = 2, /* can read */ |
| 99 | Wworksched = 4, /* write work scheduled or running */ |
| 100 | Wpending = 8, /* can write */ |
| 101 | }; |
| 102 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 103 | struct p9_poll_wait { |
| 104 | struct p9_conn *conn; |
| 105 | wait_queue_t wait; |
| 106 | wait_queue_head_t *wait_addr; |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 107 | }; |
| 108 | |
| 109 | /** |
| 110 | * struct p9_conn - fd mux connection state information |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 111 | * @mux_list: list link for mux to manage multiple connections (?) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 112 | * @client: reference to client instance for this connection |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 113 | * @err: error state |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 114 | * @req_list: accounting for requests which have been sent |
| 115 | * @unsent_req_list: accounting for requests that haven't been sent |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 116 | * @req: current request being processed (if any) |
| 117 | * @tmp_buf: temporary buffer to read in header |
| 118 | * @rsize: amount to read for current frame |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 119 | * @rpos: read position in current frame |
| 120 | * @rbuf: current read buffer |
| 121 | * @wpos: write position for current frame |
| 122 | * @wsize: amount of data to write for current frame |
| 123 | * @wbuf: current write buffer |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 124 | * @poll_pending_link: pending links to be polled per conn |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 125 | * @poll_wait: array of wait_q's for various worker threads |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 126 | * @pt: poll state |
| 127 | * @rq: current read work |
| 128 | * @wq: current write work |
| 129 | * @wsched: ???? |
| 130 | * |
| 131 | */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 132 | |
| 133 | struct p9_conn { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 134 | struct list_head mux_list; |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 135 | struct p9_client *client; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 136 | int err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 137 | struct list_head req_list; |
| 138 | struct list_head unsent_req_list; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 139 | struct p9_req_t *req; |
| 140 | char tmp_buf[7]; |
| 141 | int rsize; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 142 | int rpos; |
| 143 | char *rbuf; |
| 144 | int wpos; |
| 145 | int wsize; |
| 146 | char *wbuf; |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 147 | struct list_head poll_pending_link; |
| 148 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 149 | poll_table pt; |
| 150 | struct work_struct rq; |
| 151 | struct work_struct wq; |
| 152 | unsigned long wsched; |
| 153 | }; |
| 154 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 155 | static DEFINE_SPINLOCK(p9_poll_lock); |
| 156 | static LIST_HEAD(p9_poll_pending_list); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 157 | static struct workqueue_struct *p9_mux_wq; |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 158 | static struct task_struct *p9_poll_task; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 159 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 160 | static void p9_mux_poll_stop(struct p9_conn *m) |
| 161 | { |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 162 | unsigned long flags; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 163 | int i; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 164 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 165 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
| 166 | struct p9_poll_wait *pwait = &m->poll_wait[i]; |
| 167 | |
| 168 | if (pwait->wait_addr) { |
| 169 | remove_wait_queue(pwait->wait_addr, &pwait->wait); |
| 170 | pwait->wait_addr = NULL; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 171 | } |
| 172 | } |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 173 | |
| 174 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 175 | list_del_init(&m->poll_pending_link); |
| 176 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | /** |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 180 | * p9_conn_cancel - cancel all pending requests with error |
| 181 | * @m: mux data |
| 182 | * @err: error code |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 183 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 184 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 185 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 186 | static void p9_conn_cancel(struct p9_conn *m, int err) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 187 | { |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 188 | struct p9_req_t *req, *rtmp; |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 189 | unsigned long flags; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 190 | LIST_HEAD(cancel_list); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 191 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 192 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 193 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 194 | spin_lock_irqsave(&m->client->lock, flags); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 195 | |
| 196 | if (m->err) { |
| 197 | spin_unlock_irqrestore(&m->client->lock, flags); |
| 198 | return; |
| 199 | } |
| 200 | |
| 201 | m->err = err; |
| 202 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 203 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 204 | req->status = REQ_STATUS_ERROR; |
| 205 | if (!req->t_err) |
| 206 | req->t_err = err; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 207 | list_move(&req->req_list, &cancel_list); |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 208 | } |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 209 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 210 | req->status = REQ_STATUS_ERROR; |
| 211 | if (!req->t_err) |
| 212 | req->t_err = err; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 213 | list_move(&req->req_list, &cancel_list); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 214 | } |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 215 | spin_unlock_irqrestore(&m->client->lock, flags); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 216 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 217 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 218 | P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req); |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 219 | list_del(&req->req_list); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 220 | p9_client_cb(m->client, req); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 221 | } |
| 222 | } |
| 223 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 224 | static unsigned int |
| 225 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
| 226 | { |
| 227 | int ret, n; |
| 228 | struct p9_trans_fd *ts = NULL; |
| 229 | |
| 230 | if (client && client->status == Connected) |
| 231 | ts = client->trans; |
| 232 | |
| 233 | if (!ts) |
| 234 | return -EREMOTEIO; |
| 235 | |
| 236 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
| 237 | return -EIO; |
| 238 | |
| 239 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
| 240 | return -EIO; |
| 241 | |
| 242 | ret = ts->rd->f_op->poll(ts->rd, pt); |
| 243 | if (ret < 0) |
| 244 | return ret; |
| 245 | |
| 246 | if (ts->rd != ts->wr) { |
| 247 | n = ts->wr->f_op->poll(ts->wr, pt); |
| 248 | if (n < 0) |
| 249 | return n; |
| 250 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
| 251 | } |
| 252 | |
| 253 | return ret; |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * p9_fd_read- read from a fd |
| 258 | * @client: client instance |
| 259 | * @v: buffer to receive data into |
| 260 | * @len: size of receive buffer |
| 261 | * |
| 262 | */ |
| 263 | |
| 264 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
| 265 | { |
| 266 | int ret; |
| 267 | struct p9_trans_fd *ts = NULL; |
| 268 | |
| 269 | if (client && client->status != Disconnected) |
| 270 | ts = client->trans; |
| 271 | |
| 272 | if (!ts) |
| 273 | return -EREMOTEIO; |
| 274 | |
| 275 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
| 276 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); |
| 277 | |
| 278 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
| 279 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 280 | client->status = Disconnected; |
| 281 | return ret; |
| 282 | } |
| 283 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 284 | /** |
| 285 | * p9_read_work - called when there is some data to be read from a transport |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 286 | * @work: container of work to be done |
| 287 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 288 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 289 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 290 | static void p9_read_work(struct work_struct *work) |
| 291 | { |
| 292 | int n, err; |
| 293 | struct p9_conn *m; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 294 | |
| 295 | m = container_of(work, struct p9_conn, rq); |
| 296 | |
| 297 | if (m->err < 0) |
| 298 | return; |
| 299 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 300 | P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 301 | |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 302 | if (!m->rbuf) { |
| 303 | m->rbuf = m->tmp_buf; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 304 | m->rpos = 0; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 305 | m->rsize = 7; /* start by reading header */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | clear_bit(Rpending, &m->wsched); |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 309 | P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m, |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 310 | m->rpos, m->rsize, m->rsize-m->rpos); |
Eric Van Hensbergen | bead27f | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 311 | err = p9_fd_read(m->client, m->rbuf + m->rpos, |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 312 | m->rsize - m->rpos); |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 313 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 314 | if (err == -EAGAIN) { |
| 315 | clear_bit(Rworksched, &m->wsched); |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | if (err <= 0) |
| 320 | goto error; |
| 321 | |
| 322 | m->rpos += err; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 323 | |
| 324 | if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ |
| 325 | u16 tag; |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 326 | P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n"); |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 327 | |
| 328 | n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ |
Eric Van Hensbergen | bead27f | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 329 | if (n >= m->client->msize) { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 330 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 331 | "requested packet size too big: %d\n", n); |
| 332 | err = -EIO; |
| 333 | goto error; |
| 334 | } |
| 335 | |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 336 | tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 337 | P9_DPRINTK(P9_DEBUG_TRANS, |
| 338 | "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 339 | |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 340 | m->req = p9_tag_lookup(m->client, tag); |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 341 | if (!m->req || (m->req->status != REQ_STATUS_SENT && |
| 342 | m->req->status != REQ_STATUS_FLSH)) { |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 343 | P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
| 344 | tag); |
| 345 | err = -EIO; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 346 | goto error; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | if (m->req->rc == NULL) { |
| 350 | m->req->rc = kmalloc(sizeof(struct p9_fcall) + |
| 351 | m->client->msize, GFP_KERNEL); |
| 352 | if (!m->req->rc) { |
| 353 | m->req = NULL; |
| 354 | err = -ENOMEM; |
| 355 | goto error; |
| 356 | } |
| 357 | } |
| 358 | m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); |
| 359 | memcpy(m->rbuf, m->tmp_buf, m->rsize); |
| 360 | m->rsize = n; |
| 361 | } |
| 362 | |
| 363 | /* not an else because some packets (like clunk) have no payload */ |
| 364 | if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 365 | P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n"); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 366 | spin_lock(&m->client->lock); |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 367 | if (m->req->status != REQ_STATUS_ERROR) |
| 368 | m->req->status = REQ_STATUS_RCVD; |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 369 | list_del(&m->req->req_list); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 370 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 371 | p9_client_cb(m->client, m->req); |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 372 | m->rbuf = NULL; |
| 373 | m->rpos = 0; |
| 374 | m->rsize = 0; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 375 | m->req = NULL; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | if (!list_empty(&m->req_list)) { |
| 379 | if (test_and_clear_bit(Rpending, &m->wsched)) |
| 380 | n = POLLIN; |
| 381 | else |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 382 | n = p9_fd_poll(m->client, NULL); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 383 | |
| 384 | if (n & POLLIN) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 385 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 386 | queue_work(p9_mux_wq, &m->rq); |
| 387 | } else |
| 388 | clear_bit(Rworksched, &m->wsched); |
| 389 | } else |
| 390 | clear_bit(Rworksched, &m->wsched); |
| 391 | |
| 392 | return; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 393 | error: |
| 394 | p9_conn_cancel(m, err); |
| 395 | clear_bit(Rworksched, &m->wsched); |
| 396 | } |
| 397 | |
| 398 | /** |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 399 | * p9_fd_write - write to a socket |
| 400 | * @client: client instance |
| 401 | * @v: buffer to send data from |
| 402 | * @len: size of send buffer |
| 403 | * |
| 404 | */ |
| 405 | |
| 406 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
| 407 | { |
| 408 | int ret; |
| 409 | mm_segment_t oldfs; |
| 410 | struct p9_trans_fd *ts = NULL; |
| 411 | |
| 412 | if (client && client->status != Disconnected) |
| 413 | ts = client->trans; |
| 414 | |
| 415 | if (!ts) |
| 416 | return -EREMOTEIO; |
| 417 | |
| 418 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
| 419 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); |
| 420 | |
| 421 | oldfs = get_fs(); |
| 422 | set_fs(get_ds()); |
| 423 | /* The cast to a user pointer is valid due to the set_fs() */ |
Hannes Eder | e3db6cb | 2009-02-25 10:31:37 +0000 | [diff] [blame] | 424 | ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 425 | set_fs(oldfs); |
| 426 | |
| 427 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 428 | client->status = Disconnected; |
| 429 | return ret; |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * p9_write_work - called when a transport can send some data |
| 434 | * @work: container for work to be done |
| 435 | * |
| 436 | */ |
| 437 | |
| 438 | static void p9_write_work(struct work_struct *work) |
| 439 | { |
| 440 | int n, err; |
| 441 | struct p9_conn *m; |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 442 | struct p9_req_t *req; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 443 | |
| 444 | m = container_of(work, struct p9_conn, wq); |
| 445 | |
| 446 | if (m->err < 0) { |
| 447 | clear_bit(Wworksched, &m->wsched); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | if (!m->wsize) { |
| 452 | if (list_empty(&m->unsent_req_list)) { |
| 453 | clear_bit(Wworksched, &m->wsched); |
| 454 | return; |
| 455 | } |
| 456 | |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 457 | spin_lock(&m->client->lock); |
| 458 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 459 | req_list); |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 460 | req->status = REQ_STATUS_SENT; |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 461 | P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 462 | list_move_tail(&req->req_list, &m->req_list); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 463 | |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 464 | m->wbuf = req->tc->sdata; |
| 465 | m->wsize = req->tc->size; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 466 | m->wpos = 0; |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 467 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 468 | } |
| 469 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 470 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos, |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 471 | m->wsize); |
| 472 | clear_bit(Wpending, &m->wsched); |
| 473 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 474 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 475 | if (err == -EAGAIN) { |
| 476 | clear_bit(Wworksched, &m->wsched); |
| 477 | return; |
| 478 | } |
| 479 | |
| 480 | if (err < 0) |
| 481 | goto error; |
| 482 | else if (err == 0) { |
| 483 | err = -EREMOTEIO; |
| 484 | goto error; |
| 485 | } |
| 486 | |
| 487 | m->wpos += err; |
| 488 | if (m->wpos == m->wsize) |
| 489 | m->wpos = m->wsize = 0; |
| 490 | |
| 491 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { |
| 492 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 493 | n = POLLOUT; |
| 494 | else |
| 495 | n = p9_fd_poll(m->client, NULL); |
| 496 | |
| 497 | if (n & POLLOUT) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 498 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 499 | queue_work(p9_mux_wq, &m->wq); |
| 500 | } else |
| 501 | clear_bit(Wworksched, &m->wsched); |
| 502 | } else |
| 503 | clear_bit(Wworksched, &m->wsched); |
| 504 | |
| 505 | return; |
| 506 | |
| 507 | error: |
| 508 | p9_conn_cancel(m, err); |
| 509 | clear_bit(Wworksched, &m->wsched); |
| 510 | } |
| 511 | |
| 512 | static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
| 513 | { |
| 514 | struct p9_poll_wait *pwait = |
| 515 | container_of(wait, struct p9_poll_wait, wait); |
| 516 | struct p9_conn *m = pwait->conn; |
| 517 | unsigned long flags; |
| 518 | DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); |
| 519 | |
| 520 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 521 | if (list_empty(&m->poll_pending_link)) |
| 522 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); |
| 523 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 524 | |
| 525 | /* perform the default wake up operation */ |
| 526 | return default_wake_function(&dummy_wait, mode, sync, key); |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * p9_pollwait - add poll task to the wait queue |
| 531 | * @filp: file pointer being polled |
| 532 | * @wait_address: wait_q to block on |
| 533 | * @p: poll state |
| 534 | * |
| 535 | * called by files poll operation to add v9fs-poll task to files wait queue |
| 536 | */ |
| 537 | |
| 538 | static void |
| 539 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) |
| 540 | { |
| 541 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
| 542 | struct p9_poll_wait *pwait = NULL; |
| 543 | int i; |
| 544 | |
| 545 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
| 546 | if (m->poll_wait[i].wait_addr == NULL) { |
| 547 | pwait = &m->poll_wait[i]; |
| 548 | break; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | if (!pwait) { |
| 553 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
| 554 | return; |
| 555 | } |
| 556 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 557 | pwait->conn = m; |
| 558 | pwait->wait_addr = wait_address; |
| 559 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); |
| 560 | add_wait_queue(wait_address, &pwait->wait); |
| 561 | } |
| 562 | |
| 563 | /** |
| 564 | * p9_conn_create - allocate and initialize the per-session mux data |
| 565 | * @client: client instance |
| 566 | * |
| 567 | * Note: Creates the polling task if this is the first session. |
| 568 | */ |
| 569 | |
| 570 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
| 571 | { |
Tejun Heo | 95820a3 | 2008-10-13 18:45:20 -0500 | [diff] [blame] | 572 | int n; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 573 | struct p9_conn *m; |
| 574 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 575 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client, |
| 576 | client->msize); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 577 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
| 578 | if (!m) |
| 579 | return ERR_PTR(-ENOMEM); |
| 580 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 581 | INIT_LIST_HEAD(&m->mux_list); |
| 582 | m->client = client; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 583 | |
| 584 | INIT_LIST_HEAD(&m->req_list); |
| 585 | INIT_LIST_HEAD(&m->unsent_req_list); |
| 586 | INIT_WORK(&m->rq, p9_read_work); |
| 587 | INIT_WORK(&m->wq, p9_write_work); |
| 588 | INIT_LIST_HEAD(&m->poll_pending_link); |
| 589 | init_poll_funcptr(&m->pt, p9_pollwait); |
| 590 | |
| 591 | n = p9_fd_poll(client, &m->pt); |
| 592 | if (n & POLLIN) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 593 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 594 | set_bit(Rpending, &m->wsched); |
| 595 | } |
| 596 | |
| 597 | if (n & POLLOUT) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 598 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 599 | set_bit(Wpending, &m->wsched); |
| 600 | } |
| 601 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 602 | return m; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * p9_poll_mux - polls a mux and schedules read or write works if necessary |
| 607 | * @m: connection to poll |
| 608 | * |
| 609 | */ |
| 610 | |
| 611 | static void p9_poll_mux(struct p9_conn *m) |
| 612 | { |
| 613 | int n; |
| 614 | |
| 615 | if (m->err < 0) |
| 616 | return; |
| 617 | |
| 618 | n = p9_fd_poll(m->client, NULL); |
| 619 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 620 | P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 621 | if (n >= 0) |
| 622 | n = -ECONNRESET; |
| 623 | p9_conn_cancel(m, n); |
| 624 | } |
| 625 | |
| 626 | if (n & POLLIN) { |
| 627 | set_bit(Rpending, &m->wsched); |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 628 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 629 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 630 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 631 | queue_work(p9_mux_wq, &m->rq); |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | if (n & POLLOUT) { |
| 636 | set_bit(Wpending, &m->wsched); |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 637 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 638 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
| 639 | !test_and_set_bit(Wworksched, &m->wsched)) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 640 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 641 | queue_work(p9_mux_wq, &m->wq); |
| 642 | } |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | /** |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 647 | * p9_fd_request - send 9P request |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 648 | * The function can sleep until the request is scheduled for sending. |
| 649 | * The function can be interrupted. Return from the function is not |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 650 | * a guarantee that the request is sent successfully. |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 651 | * |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 652 | * @client: client instance |
| 653 | * @req: request to be sent |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 654 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 655 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 656 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 657 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 658 | { |
| 659 | int n; |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 660 | struct p9_trans_fd *ts = client->trans; |
| 661 | struct p9_conn *m = ts->conn; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 662 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 663 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m, |
| 664 | current, req->tc, req->tc->id); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 665 | if (m->err < 0) |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 666 | return m->err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 667 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 668 | spin_lock(&client->lock); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 669 | req->status = REQ_STATUS_UNSENT; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 670 | list_add_tail(&req->req_list, &m->unsent_req_list); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 671 | spin_unlock(&client->lock); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 672 | |
| 673 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 674 | n = POLLOUT; |
| 675 | else |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 676 | n = p9_fd_poll(m->client, NULL); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 677 | |
| 678 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
| 679 | queue_work(p9_mux_wq, &m->wq); |
| 680 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 681 | return 0; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 682 | } |
| 683 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 684 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 685 | { |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 686 | int ret = 1; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 687 | |
Eric Van Hensbergen | 0b15a3a | 2008-10-22 18:47:40 -0500 | [diff] [blame] | 688 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 689 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 690 | spin_lock(&client->lock); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 691 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 692 | if (req->status == REQ_STATUS_UNSENT) { |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 693 | list_del(&req->req_list); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 694 | req->status = REQ_STATUS_FLSHD; |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 695 | ret = 0; |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 696 | } else if (req->status == REQ_STATUS_SENT) |
| 697 | req->status = REQ_STATUS_FLSH; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 698 | |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 699 | spin_unlock(&client->lock); |
| 700 | |
| 701 | return ret; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 702 | } |
| 703 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 704 | /** |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 705 | * parse_opts - parse mount options into p9_fd_opts structure |
| 706 | * @params: options string passed from mount |
| 707 | * @opts: fd transport-specific structure to parse options into |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 708 | * |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 709 | * Returns 0 upon success, -ERRNO upon failure |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 710 | */ |
| 711 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 712 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 713 | { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 714 | char *p; |
| 715 | substring_t args[MAX_OPT_ARGS]; |
| 716 | int option; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 717 | char *options; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 718 | int ret; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 719 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 720 | opts->port = P9_PORT; |
| 721 | opts->rfd = ~0; |
| 722 | opts->wfd = ~0; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 723 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 724 | if (!params) |
| 725 | return 0; |
| 726 | |
| 727 | options = kstrdup(params, GFP_KERNEL); |
| 728 | if (!options) { |
| 729 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 730 | "failed to allocate copy of option string\n"); |
| 731 | return -ENOMEM; |
| 732 | } |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 733 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 734 | while ((p = strsep(&options, ",")) != NULL) { |
| 735 | int token; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 736 | int r; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 737 | if (!*p) |
| 738 | continue; |
| 739 | token = match_token(p, tokens, args); |
Abhishek Kulkarni | 15da4b1 | 2009-07-01 08:50:54 +0000 | [diff] [blame] | 740 | if (token != Opt_err) { |
| 741 | r = match_int(&args[0], &option); |
| 742 | if (r < 0) { |
| 743 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 744 | "integer field, but no integer?\n"); |
| 745 | ret = r; |
| 746 | continue; |
| 747 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 748 | } |
| 749 | switch (token) { |
| 750 | case Opt_port: |
| 751 | opts->port = option; |
| 752 | break; |
| 753 | case Opt_rfdno: |
| 754 | opts->rfd = option; |
| 755 | break; |
| 756 | case Opt_wfdno: |
| 757 | opts->wfd = option; |
| 758 | break; |
| 759 | default: |
| 760 | continue; |
| 761 | } |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 762 | } |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 763 | kfree(options); |
| 764 | return 0; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 765 | } |
| 766 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 767 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 768 | { |
| 769 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
| 770 | GFP_KERNEL); |
| 771 | if (!ts) |
| 772 | return -ENOMEM; |
| 773 | |
| 774 | ts->rd = fget(rfd); |
| 775 | ts->wr = fget(wfd); |
| 776 | if (!ts->rd || !ts->wr) { |
| 777 | if (ts->rd) |
| 778 | fput(ts->rd); |
| 779 | if (ts->wr) |
| 780 | fput(ts->wr); |
| 781 | kfree(ts); |
| 782 | return -EIO; |
| 783 | } |
| 784 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 785 | client->trans = ts; |
| 786 | client->status = Connected; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 787 | |
| 788 | return 0; |
| 789 | } |
| 790 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 791 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 792 | { |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 793 | struct p9_trans_fd *p; |
| 794 | int ret, fd; |
| 795 | |
| 796 | p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
| 797 | if (!p) |
| 798 | return -ENOMEM; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 799 | |
| 800 | csocket->sk->sk_allocation = GFP_NOIO; |
Ulrich Drepper | a677a03 | 2008-07-23 21:29:17 -0700 | [diff] [blame] | 801 | fd = sock_map_fd(csocket, 0); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 802 | if (fd < 0) { |
| 803 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 804 | sock_release(csocket); |
| 805 | kfree(p); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 806 | return fd; |
| 807 | } |
| 808 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 809 | get_file(csocket->file); |
| 810 | get_file(csocket->file); |
| 811 | p->wr = p->rd = csocket->file; |
| 812 | client->trans = p; |
| 813 | client->status = Connected; |
| 814 | |
| 815 | sys_close(fd); /* still racy */ |
| 816 | |
| 817 | p->rd->f_flags |= O_NONBLOCK; |
| 818 | |
| 819 | p->conn = p9_conn_create(client); |
| 820 | if (IS_ERR(p->conn)) { |
| 821 | ret = PTR_ERR(p->conn); |
| 822 | p->conn = NULL; |
| 823 | kfree(p); |
| 824 | sockfd_put(csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 825 | sockfd_put(csocket); |
| 826 | return ret; |
| 827 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 828 | return 0; |
| 829 | } |
| 830 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 831 | /** |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 832 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
| 833 | * @m: mux to destroy |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 834 | * |
| 835 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 836 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 837 | static void p9_conn_destroy(struct p9_conn *m) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 838 | { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 839 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m, |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 840 | m->mux_list.prev, m->mux_list.next); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 841 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 842 | p9_mux_poll_stop(m); |
| 843 | cancel_work_sync(&m->rq); |
| 844 | cancel_work_sync(&m->wq); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 845 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 846 | p9_conn_cancel(m, -ECONNRESET); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 847 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 848 | m->client = NULL; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 849 | kfree(m); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | /** |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 853 | * p9_fd_close - shutdown file descriptor transport |
| 854 | * @client: client instance |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 855 | * |
| 856 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 857 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 858 | static void p9_fd_close(struct p9_client *client) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 859 | { |
| 860 | struct p9_trans_fd *ts; |
| 861 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 862 | if (!client) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 863 | return; |
| 864 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 865 | ts = client->trans; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 866 | if (!ts) |
| 867 | return; |
| 868 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 869 | client->status = Disconnected; |
| 870 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 871 | p9_conn_destroy(ts->conn); |
| 872 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 873 | if (ts->rd) |
| 874 | fput(ts->rd); |
| 875 | if (ts->wr) |
| 876 | fput(ts->wr); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 877 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 878 | kfree(ts); |
| 879 | } |
| 880 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 881 | /* |
| 882 | * stolen from NFS - maybe should be made a generic function? |
| 883 | */ |
| 884 | static inline int valid_ipaddr4(const char *buf) |
| 885 | { |
| 886 | int rc, count, in[4]; |
| 887 | |
| 888 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
| 889 | if (rc != 4) |
| 890 | return -EINVAL; |
| 891 | for (count = 0; count < 4; count++) { |
| 892 | if (in[count] > 255) |
| 893 | return -EINVAL; |
| 894 | } |
| 895 | return 0; |
| 896 | } |
| 897 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 898 | static int |
| 899 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 900 | { |
| 901 | int err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 902 | struct socket *csocket; |
| 903 | struct sockaddr_in sin_server; |
| 904 | struct p9_fd_opts opts; |
| 905 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 906 | err = parse_opts(args, &opts); |
| 907 | if (err < 0) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 908 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 909 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 910 | if (valid_ipaddr4(addr) < 0) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 911 | return -EINVAL; |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 912 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 913 | csocket = NULL; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 914 | |
| 915 | sin_server.sin_family = AF_INET; |
| 916 | sin_server.sin_addr.s_addr = in_aton(addr); |
| 917 | sin_server.sin_port = htons(opts.port); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 918 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 919 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 920 | if (err) { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 921 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 922 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 923 | } |
| 924 | |
| 925 | err = csocket->ops->connect(csocket, |
| 926 | (struct sockaddr *)&sin_server, |
| 927 | sizeof(struct sockaddr_in), 0); |
| 928 | if (err < 0) { |
| 929 | P9_EPRINTK(KERN_ERR, |
| 930 | "p9_trans_tcp: problem connecting socket to %s\n", |
| 931 | addr); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 932 | sock_release(csocket); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 933 | return err; |
| 934 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 935 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 936 | return p9_socket_open(client, csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 937 | } |
| 938 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 939 | static int |
| 940 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 941 | { |
| 942 | int err; |
| 943 | struct socket *csocket; |
| 944 | struct sockaddr_un sun_server; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 945 | |
| 946 | csocket = NULL; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 947 | |
| 948 | if (strlen(addr) > UNIX_PATH_MAX) { |
| 949 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", |
| 950 | addr); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 951 | return -ENAMETOOLONG; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 952 | } |
| 953 | |
| 954 | sun_server.sun_family = PF_UNIX; |
| 955 | strcpy(sun_server.sun_path, addr); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 956 | err = sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); |
| 957 | if (err < 0) { |
| 958 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n"); |
| 959 | return err; |
| 960 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 961 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| 962 | sizeof(struct sockaddr_un) - 1, 0); |
| 963 | if (err < 0) { |
| 964 | P9_EPRINTK(KERN_ERR, |
| 965 | "p9_trans_unix: problem connecting socket: %s: %d\n", |
| 966 | addr, err); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 967 | sock_release(csocket); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 968 | return err; |
| 969 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 970 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 971 | return p9_socket_open(client, csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 972 | } |
| 973 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 974 | static int |
| 975 | p9_fd_create(struct p9_client *client, const char *addr, char *args) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 976 | { |
| 977 | int err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 978 | struct p9_fd_opts opts; |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 979 | struct p9_trans_fd *p; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 980 | |
| 981 | parse_opts(args, &opts); |
| 982 | |
| 983 | if (opts.rfd == ~0 || opts.wfd == ~0) { |
| 984 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 985 | return -ENOPROTOOPT; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 986 | } |
| 987 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 988 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 989 | if (err < 0) |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 990 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 991 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 992 | p = (struct p9_trans_fd *) client->trans; |
| 993 | p->conn = p9_conn_create(client); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 994 | if (IS_ERR(p->conn)) { |
| 995 | err = PTR_ERR(p->conn); |
| 996 | p->conn = NULL; |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 997 | fput(p->rd); |
| 998 | fput(p->wr); |
| 999 | return err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1000 | } |
| 1001 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1002 | return 0; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1003 | } |
| 1004 | |
| 1005 | static struct p9_trans_module p9_tcp_trans = { |
| 1006 | .name = "tcp", |
| 1007 | .maxsize = MAX_SOCK_BUF, |
| 1008 | .def = 1, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1009 | .create = p9_fd_create_tcp, |
| 1010 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1011 | .request = p9_fd_request, |
| 1012 | .cancel = p9_fd_cancel, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1013 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1014 | }; |
| 1015 | |
| 1016 | static struct p9_trans_module p9_unix_trans = { |
| 1017 | .name = "unix", |
| 1018 | .maxsize = MAX_SOCK_BUF, |
| 1019 | .def = 0, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1020 | .create = p9_fd_create_unix, |
| 1021 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1022 | .request = p9_fd_request, |
| 1023 | .cancel = p9_fd_cancel, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1024 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1025 | }; |
| 1026 | |
| 1027 | static struct p9_trans_module p9_fd_trans = { |
| 1028 | .name = "fd", |
| 1029 | .maxsize = MAX_SOCK_BUF, |
| 1030 | .def = 0, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1031 | .create = p9_fd_create, |
| 1032 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1033 | .request = p9_fd_request, |
| 1034 | .cancel = p9_fd_cancel, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1035 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1036 | }; |
| 1037 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1038 | /** |
| 1039 | * p9_poll_proc - poll worker thread |
| 1040 | * @a: thread state and arguments |
| 1041 | * |
| 1042 | * polls all v9fs transports for new events and queues the appropriate |
| 1043 | * work to the work queue |
| 1044 | * |
| 1045 | */ |
| 1046 | |
| 1047 | static int p9_poll_proc(void *a) |
| 1048 | { |
| 1049 | unsigned long flags; |
| 1050 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 1051 | P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1052 | repeat: |
| 1053 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 1054 | while (!list_empty(&p9_poll_pending_list)) { |
| 1055 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, |
| 1056 | struct p9_conn, |
| 1057 | poll_pending_link); |
| 1058 | list_del_init(&conn->poll_pending_link); |
| 1059 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 1060 | |
| 1061 | p9_poll_mux(conn); |
| 1062 | |
| 1063 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 1064 | } |
| 1065 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 1066 | |
| 1067 | set_current_state(TASK_INTERRUPTIBLE); |
| 1068 | if (list_empty(&p9_poll_pending_list)) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 1069 | P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1070 | schedule(); |
| 1071 | } |
| 1072 | __set_current_state(TASK_RUNNING); |
| 1073 | |
| 1074 | if (!kthread_should_stop()) |
| 1075 | goto repeat; |
| 1076 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 1077 | P9_DPRINTK(P9_DEBUG_TRANS, "finish\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1078 | return 0; |
| 1079 | } |
| 1080 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 1081 | int p9_trans_fd_init(void) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1082 | { |
Tejun Heo | 206ca50 | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1083 | p9_mux_wq = create_workqueue("v9fs"); |
| 1084 | if (!p9_mux_wq) { |
| 1085 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); |
| 1086 | return -ENOMEM; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1087 | } |
| 1088 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1089 | p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll"); |
| 1090 | if (IS_ERR(p9_poll_task)) { |
| 1091 | destroy_workqueue(p9_mux_wq); |
| 1092 | printk(KERN_WARNING "v9fs: mux: creating poll task failed\n"); |
| 1093 | return PTR_ERR(p9_poll_task); |
| 1094 | } |
| 1095 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1096 | v9fs_register_trans(&p9_tcp_trans); |
| 1097 | v9fs_register_trans(&p9_unix_trans); |
| 1098 | v9fs_register_trans(&p9_fd_trans); |
| 1099 | |
Andrew Morton | 3387b80 | 2008-03-28 14:15:57 -0700 | [diff] [blame] | 1100 | return 0; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1101 | } |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1102 | |
| 1103 | void p9_trans_fd_exit(void) |
| 1104 | { |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1105 | kthread_stop(p9_poll_task); |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1106 | v9fs_unregister_trans(&p9_tcp_trans); |
| 1107 | v9fs_unregister_trans(&p9_unix_trans); |
| 1108 | v9fs_unregister_trans(&p9_fd_trans); |
Tejun Heo | 206ca50 | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1109 | |
| 1110 | destroy_workqueue(p9_mux_wq); |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1111 | } |