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 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 29 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 30 | #include <linux/in.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/net.h> |
| 33 | #include <linux/ipv6.h> |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 34 | #include <linux/kthread.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 35 | #include <linux/errno.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/un.h> |
| 38 | #include <linux/uaccess.h> |
| 39 | #include <linux/inet.h> |
| 40 | #include <linux/idr.h> |
| 41 | #include <linux/file.h> |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 42 | #include <linux/parser.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 43 | #include <linux/slab.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 44 | #include <net/9p/9p.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 45 | #include <net/9p/client.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 46 | #include <net/9p/transport.h> |
| 47 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 48 | #include <linux/syscalls.h> /* killme */ |
| 49 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 50 | #define P9_PORT 564 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 51 | #define MAX_SOCK_BUF (64*1024) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 52 | #define MAXPOLLWADDR 2 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 53 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 54 | /** |
| 55 | * struct p9_fd_opts - per-transport options |
| 56 | * @rfd: file descriptor for reading (trans=fd) |
| 57 | * @wfd: file descriptor for writing (trans=fd) |
| 58 | * @port: port to connect to (trans=tcp) |
| 59 | * |
| 60 | */ |
| 61 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 62 | struct p9_fd_opts { |
| 63 | int rfd; |
| 64 | int wfd; |
| 65 | u16 port; |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 66 | int privport; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 67 | }; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 68 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 69 | /* |
| 70 | * Option Parsing (code inspired by NFS code) |
| 71 | * - a little lazy - parse all fd-transport options |
| 72 | */ |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 73 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 74 | enum { |
| 75 | /* Options that take integer arguments */ |
Latchesar Ionkov | 5576269 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 76 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 77 | /* Options that take no arguments */ |
| 78 | Opt_privport, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 79 | }; |
| 80 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 81 | static const match_table_t tokens = { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 82 | {Opt_port, "port=%u"}, |
| 83 | {Opt_rfdno, "rfdno=%u"}, |
| 84 | {Opt_wfdno, "wfdno=%u"}, |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 85 | {Opt_privport, "privport"}, |
Latchesar Ionkov | 5576269 | 2007-11-06 08:02:53 -0600 | [diff] [blame] | 86 | {Opt_err, NULL}, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 87 | }; |
| 88 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 89 | enum { |
| 90 | Rworksched = 1, /* read work scheduled or running */ |
| 91 | Rpending = 2, /* can read */ |
| 92 | Wworksched = 4, /* write work scheduled or running */ |
| 93 | Wpending = 8, /* can write */ |
| 94 | }; |
| 95 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 96 | struct p9_poll_wait { |
| 97 | struct p9_conn *conn; |
| 98 | wait_queue_t wait; |
| 99 | wait_queue_head_t *wait_addr; |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 100 | }; |
| 101 | |
| 102 | /** |
| 103 | * struct p9_conn - fd mux connection state information |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 104 | * @mux_list: list link for mux to manage multiple connections (?) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 105 | * @client: reference to client instance for this connection |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 106 | * @err: error state |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 107 | * @req_list: accounting for requests which have been sent |
| 108 | * @unsent_req_list: accounting for requests that haven't been sent |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 109 | * @req: current request being processed (if any) |
| 110 | * @tmp_buf: temporary buffer to read in header |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 111 | * @rc: temporary fcall for reading current frame |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 112 | * @wpos: write position for current frame |
| 113 | * @wsize: amount of data to write for current frame |
| 114 | * @wbuf: current write buffer |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 115 | * @poll_pending_link: pending links to be polled per conn |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 116 | * @poll_wait: array of wait_q's for various worker threads |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 117 | * @pt: poll state |
| 118 | * @rq: current read work |
| 119 | * @wq: current write work |
| 120 | * @wsched: ???? |
| 121 | * |
| 122 | */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 123 | |
| 124 | struct p9_conn { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 125 | struct list_head mux_list; |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 126 | struct p9_client *client; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 127 | int err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 128 | struct list_head req_list; |
| 129 | struct list_head unsent_req_list; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 130 | struct p9_req_t *req; |
| 131 | char tmp_buf[7]; |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 132 | struct p9_fcall rc; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 133 | int wpos; |
| 134 | int wsize; |
| 135 | char *wbuf; |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 136 | struct list_head poll_pending_link; |
| 137 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 138 | poll_table pt; |
| 139 | struct work_struct rq; |
| 140 | struct work_struct wq; |
| 141 | unsigned long wsched; |
| 142 | }; |
| 143 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 144 | /** |
| 145 | * struct p9_trans_fd - transport state |
| 146 | * @rd: reference to file to read from |
| 147 | * @wr: reference of file to write to |
| 148 | * @conn: connection state reference |
| 149 | * |
| 150 | */ |
| 151 | |
| 152 | struct p9_trans_fd { |
| 153 | struct file *rd; |
| 154 | struct file *wr; |
| 155 | struct p9_conn conn; |
| 156 | }; |
| 157 | |
Tejun Heo | aa70c58 | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 158 | static void p9_poll_workfn(struct work_struct *work); |
| 159 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 160 | static DEFINE_SPINLOCK(p9_poll_lock); |
| 161 | static LIST_HEAD(p9_poll_pending_list); |
Tejun Heo | aa70c58 | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 162 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 163 | |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 164 | static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
| 165 | static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; |
| 166 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 167 | static void p9_mux_poll_stop(struct p9_conn *m) |
| 168 | { |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 169 | unsigned long flags; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 170 | int i; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 171 | |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 172 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
| 173 | struct p9_poll_wait *pwait = &m->poll_wait[i]; |
| 174 | |
| 175 | if (pwait->wait_addr) { |
| 176 | remove_wait_queue(pwait->wait_addr, &pwait->wait); |
| 177 | pwait->wait_addr = NULL; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 178 | } |
| 179 | } |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 180 | |
| 181 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 182 | list_del_init(&m->poll_pending_link); |
| 183 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
Tomas Bortoli | 35c740d | 2018-07-20 11:27:30 +0200 | [diff] [blame] | 184 | |
| 185 | flush_work(&p9_poll_work); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | /** |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 189 | * p9_conn_cancel - cancel all pending requests with error |
| 190 | * @m: mux data |
| 191 | * @err: error code |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 192 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 193 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 194 | |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame] | 195 | static void p9_conn_cancel(struct p9_conn *m, int err) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 196 | { |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 197 | struct p9_req_t *req, *rtmp; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 198 | LIST_HEAD(cancel_list); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 199 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 200 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 201 | |
Tomas Bortoli | eb1ca07 | 2018-07-23 20:42:53 +0200 | [diff] [blame] | 202 | spin_lock(&m->client->lock); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 203 | |
| 204 | if (m->err) { |
Tomas Bortoli | eb1ca07 | 2018-07-23 20:42:53 +0200 | [diff] [blame] | 205 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 206 | return; |
| 207 | } |
| 208 | |
| 209 | m->err = err; |
| 210 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 211 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
| 212 | list_move(&req->req_list, &cancel_list); |
Tejun Heo | 992b3f1 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 213 | } |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 214 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
| 215 | list_move(&req->req_list, &cancel_list); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 216 | } |
| 217 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 218 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 219 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 220 | list_del(&req->req_list); |
Dominique Martinet | 2b6e72e | 2014-01-17 18:31:00 +0100 | [diff] [blame] | 221 | if (!req->t_err) |
| 222 | req->t_err = err; |
| 223 | p9_client_cb(m->client, req, REQ_STATUS_ERROR); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 224 | } |
Tomas Bortoli | eb1ca07 | 2018-07-23 20:42:53 +0200 | [diff] [blame] | 225 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 226 | } |
| 227 | |
Julia Lawall | 29af930 | 2010-09-05 09:00:21 +0000 | [diff] [blame] | 228 | static int |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 229 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
| 230 | { |
| 231 | int ret, n; |
| 232 | struct p9_trans_fd *ts = NULL; |
| 233 | |
| 234 | if (client && client->status == Connected) |
| 235 | ts = client->trans; |
| 236 | |
| 237 | if (!ts) |
| 238 | return -EREMOTEIO; |
| 239 | |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 240 | if (!ts->rd->f_op->poll) |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 241 | return -EIO; |
| 242 | |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 243 | if (!ts->wr->f_op->poll) |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 244 | return -EIO; |
| 245 | |
| 246 | ret = ts->rd->f_op->poll(ts->rd, pt); |
| 247 | if (ret < 0) |
| 248 | return ret; |
| 249 | |
| 250 | if (ts->rd != ts->wr) { |
| 251 | n = ts->wr->f_op->poll(ts->wr, pt); |
| 252 | if (n < 0) |
| 253 | return n; |
| 254 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
| 255 | } |
| 256 | |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * p9_fd_read- read from a fd |
| 262 | * @client: client instance |
| 263 | * @v: buffer to receive data into |
| 264 | * @len: size of receive buffer |
| 265 | * |
| 266 | */ |
| 267 | |
| 268 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
| 269 | { |
| 270 | int ret; |
| 271 | struct p9_trans_fd *ts = NULL; |
| 272 | |
| 273 | if (client && client->status != Disconnected) |
| 274 | ts = client->trans; |
| 275 | |
| 276 | if (!ts) |
| 277 | return -EREMOTEIO; |
| 278 | |
| 279 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 280 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 281 | |
| 282 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
| 283 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 284 | client->status = Disconnected; |
| 285 | return ret; |
| 286 | } |
| 287 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 288 | /** |
| 289 | * 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] | 290 | * @work: container of work to be done |
| 291 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 292 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 293 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 294 | static void p9_read_work(struct work_struct *work) |
| 295 | { |
| 296 | int n, err; |
| 297 | struct p9_conn *m; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 298 | |
| 299 | m = container_of(work, struct p9_conn, rq); |
| 300 | |
| 301 | if (m->err < 0) |
| 302 | return; |
| 303 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 304 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 305 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 306 | if (!m->rc.sdata) { |
| 307 | m->rc.sdata = m->tmp_buf; |
| 308 | m->rc.offset = 0; |
| 309 | m->rc.capacity = 7; /* start by reading header */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | clear_bit(Rpending, &m->wsched); |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 313 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
| 314 | m, m->rc.offset, m->rc.capacity, |
| 315 | m->rc.capacity - m->rc.offset); |
| 316 | err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, |
| 317 | m->rc.capacity - m->rc.offset); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 318 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 319 | if (err == -EAGAIN) |
Simon Derr | 0462194 | 2012-09-17 15:16:28 +0200 | [diff] [blame] | 320 | goto end_clear; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 321 | |
| 322 | if (err <= 0) |
| 323 | goto error; |
| 324 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 325 | m->rc.offset += err; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 326 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 327 | /* header read in */ |
| 328 | if ((!m->req) && (m->rc.offset == m->rc.capacity)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 329 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 330 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 331 | err = p9_parse_header(&m->rc, NULL, NULL, NULL, 0); |
| 332 | if (err) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 333 | p9_debug(P9_DEBUG_ERROR, |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 334 | "error parsing header: %d\n", err); |
| 335 | goto error; |
| 336 | } |
| 337 | |
| 338 | if (m->rc.size >= m->client->msize) { |
| 339 | p9_debug(P9_DEBUG_ERROR, |
| 340 | "requested packet size too big: %d\n", |
| 341 | m->rc.size); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 342 | err = -EIO; |
| 343 | goto error; |
| 344 | } |
| 345 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 346 | p9_debug(P9_DEBUG_TRANS, |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 347 | "mux %p pkt: size: %d bytes tag: %d\n", |
| 348 | m, m->rc.size, m->rc.tag); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 349 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 350 | m->req = p9_tag_lookup(m->client, m->rc.tag); |
Simon Derr | 0bfd684 | 2014-03-10 16:38:52 +0100 | [diff] [blame] | 351 | if (!m->req || (m->req->status != REQ_STATUS_SENT)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 352 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 353 | m->rc.tag); |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 354 | err = -EIO; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 355 | goto error; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | if (m->req->rc == NULL) { |
Dominique Martinet | 3053600 | 2015-09-07 17:06:54 +0200 | [diff] [blame] | 359 | p9_debug(P9_DEBUG_ERROR, |
| 360 | "No recv fcall for tag %d (req %p), disconnecting!\n", |
| 361 | m->rc.tag, m->req); |
| 362 | m->req = NULL; |
| 363 | err = -EIO; |
| 364 | goto error; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 365 | } |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 366 | m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall); |
| 367 | memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); |
| 368 | m->rc.capacity = m->rc.size; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 369 | } |
| 370 | |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 371 | /* packet is read in |
| 372 | * not an else because some packets (like clunk) have no payload |
| 373 | */ |
| 374 | if ((m->req) && (m->rc.offset == m->rc.capacity)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 375 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 376 | spin_lock(&m->client->lock); |
Dominique Martinet | e73153e | 2018-10-09 11:18:52 +0900 | [diff] [blame] | 377 | if (m->req->status == REQ_STATUS_SENT) { |
| 378 | list_del(&m->req->req_list); |
| 379 | p9_client_cb(m->client, m->req, REQ_STATUS_RCVD); |
Wang Hai | 294711f | 2020-06-12 17:08:33 +0800 | [diff] [blame] | 380 | } else if (m->req->status == REQ_STATUS_FLSHD) { |
| 381 | /* Ignore replies associated with a cancelled request. */ |
| 382 | p9_debug(P9_DEBUG_TRANS, |
| 383 | "Ignore replies associated with a cancelled request\n"); |
Dominique Martinet | e73153e | 2018-10-09 11:18:52 +0900 | [diff] [blame] | 384 | } else { |
| 385 | spin_unlock(&m->client->lock); |
| 386 | p9_debug(P9_DEBUG_ERROR, |
| 387 | "Request tag %d errored out while we were reading the reply\n", |
| 388 | m->rc.tag); |
| 389 | err = -EIO; |
| 390 | goto error; |
| 391 | } |
Tomas Bortoli | eb1ca07 | 2018-07-23 20:42:53 +0200 | [diff] [blame] | 392 | spin_unlock(&m->client->lock); |
Dominique Martinet | 947867a | 2015-09-03 11:28:20 +0200 | [diff] [blame] | 393 | m->rc.sdata = NULL; |
| 394 | m->rc.offset = 0; |
| 395 | m->rc.capacity = 0; |
Eric Van Hensbergen | 1b0a763 | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 396 | m->req = NULL; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 397 | } |
| 398 | |
Simon Derr | 0462194 | 2012-09-17 15:16:28 +0200 | [diff] [blame] | 399 | end_clear: |
| 400 | clear_bit(Rworksched, &m->wsched); |
| 401 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 402 | if (!list_empty(&m->req_list)) { |
| 403 | if (test_and_clear_bit(Rpending, &m->wsched)) |
| 404 | n = POLLIN; |
| 405 | else |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 406 | n = p9_fd_poll(m->client, NULL); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 407 | |
Simon Derr | 0462194 | 2012-09-17 15:16:28 +0200 | [diff] [blame] | 408 | if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 409 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
Tejun Heo | 61edeee | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 410 | schedule_work(&m->rq); |
Simon Derr | 0462194 | 2012-09-17 15:16:28 +0200 | [diff] [blame] | 411 | } |
| 412 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 413 | |
| 414 | return; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 415 | error: |
| 416 | p9_conn_cancel(m, err); |
| 417 | clear_bit(Rworksched, &m->wsched); |
| 418 | } |
| 419 | |
| 420 | /** |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 421 | * p9_fd_write - write to a socket |
| 422 | * @client: client instance |
| 423 | * @v: buffer to send data from |
| 424 | * @len: size of send buffer |
| 425 | * |
| 426 | */ |
| 427 | |
| 428 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
| 429 | { |
| 430 | int ret; |
| 431 | mm_segment_t oldfs; |
| 432 | struct p9_trans_fd *ts = NULL; |
| 433 | |
| 434 | if (client && client->status != Disconnected) |
| 435 | ts = client->trans; |
| 436 | |
| 437 | if (!ts) |
| 438 | return -EREMOTEIO; |
| 439 | |
| 440 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 441 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 442 | |
| 443 | oldfs = get_fs(); |
| 444 | set_fs(get_ds()); |
| 445 | /* 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] | 446 | 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] | 447 | set_fs(oldfs); |
| 448 | |
| 449 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 450 | client->status = Disconnected; |
| 451 | return ret; |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * p9_write_work - called when a transport can send some data |
| 456 | * @work: container for work to be done |
| 457 | * |
| 458 | */ |
| 459 | |
| 460 | static void p9_write_work(struct work_struct *work) |
| 461 | { |
| 462 | int n, err; |
| 463 | struct p9_conn *m; |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 464 | struct p9_req_t *req; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 465 | |
| 466 | m = container_of(work, struct p9_conn, wq); |
| 467 | |
| 468 | if (m->err < 0) { |
| 469 | clear_bit(Wworksched, &m->wsched); |
| 470 | return; |
| 471 | } |
| 472 | |
| 473 | if (!m->wsize) { |
Simon Derr | 759f429 | 2012-09-17 15:16:31 +0200 | [diff] [blame] | 474 | spin_lock(&m->client->lock); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 475 | if (list_empty(&m->unsent_req_list)) { |
| 476 | clear_bit(Wworksched, &m->wsched); |
Simon Derr | 759f429 | 2012-09-17 15:16:31 +0200 | [diff] [blame] | 477 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 478 | return; |
| 479 | } |
| 480 | |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 481 | 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] | 482 | req_list); |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 483 | req->status = REQ_STATUS_SENT; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 484 | p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 485 | list_move_tail(&req->req_list, &m->req_list); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 486 | |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 487 | m->wbuf = req->tc->sdata; |
| 488 | m->wsize = req->tc->size; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 489 | m->wpos = 0; |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 490 | spin_unlock(&m->client->lock); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 491 | } |
| 492 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 493 | p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
| 494 | m, m->wpos, m->wsize); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 495 | clear_bit(Wpending, &m->wsched); |
| 496 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 497 | p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
Simon Derr | 584a8c1 | 2012-09-17 15:16:30 +0200 | [diff] [blame] | 498 | if (err == -EAGAIN) |
| 499 | goto end_clear; |
| 500 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 501 | |
| 502 | if (err < 0) |
| 503 | goto error; |
| 504 | else if (err == 0) { |
| 505 | err = -EREMOTEIO; |
| 506 | goto error; |
| 507 | } |
| 508 | |
| 509 | m->wpos += err; |
| 510 | if (m->wpos == m->wsize) |
| 511 | m->wpos = m->wsize = 0; |
| 512 | |
Simon Derr | 584a8c1 | 2012-09-17 15:16:30 +0200 | [diff] [blame] | 513 | end_clear: |
| 514 | clear_bit(Wworksched, &m->wsched); |
| 515 | |
Simon Derr | 1957b3a | 2012-09-17 15:16:29 +0200 | [diff] [blame] | 516 | if (m->wsize || !list_empty(&m->unsent_req_list)) { |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 517 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 518 | n = POLLOUT; |
| 519 | else |
| 520 | n = p9_fd_poll(m->client, NULL); |
| 521 | |
Simon Derr | 584a8c1 | 2012-09-17 15:16:30 +0200 | [diff] [blame] | 522 | if ((n & POLLOUT) && |
| 523 | !test_and_set_bit(Wworksched, &m->wsched)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 524 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
Tejun Heo | 61edeee | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 525 | schedule_work(&m->wq); |
Simon Derr | 584a8c1 | 2012-09-17 15:16:30 +0200 | [diff] [blame] | 526 | } |
| 527 | } |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 528 | |
| 529 | return; |
| 530 | |
| 531 | error: |
| 532 | p9_conn_cancel(m, err); |
| 533 | clear_bit(Wworksched, &m->wsched); |
| 534 | } |
| 535 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 536 | static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key) |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 537 | { |
| 538 | struct p9_poll_wait *pwait = |
| 539 | container_of(wait, struct p9_poll_wait, wait); |
| 540 | struct p9_conn *m = pwait->conn; |
| 541 | unsigned long flags; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 542 | |
| 543 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 544 | if (list_empty(&m->poll_pending_link)) |
| 545 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); |
| 546 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 547 | |
Tejun Heo | aa70c58 | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 548 | schedule_work(&p9_poll_work); |
| 549 | return 1; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | /** |
| 553 | * p9_pollwait - add poll task to the wait queue |
| 554 | * @filp: file pointer being polled |
| 555 | * @wait_address: wait_q to block on |
| 556 | * @p: poll state |
| 557 | * |
| 558 | * called by files poll operation to add v9fs-poll task to files wait queue |
| 559 | */ |
| 560 | |
| 561 | static void |
| 562 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) |
| 563 | { |
| 564 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
| 565 | struct p9_poll_wait *pwait = NULL; |
| 566 | int i; |
| 567 | |
| 568 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
| 569 | if (m->poll_wait[i].wait_addr == NULL) { |
| 570 | pwait = &m->poll_wait[i]; |
| 571 | break; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | if (!pwait) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 576 | p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 577 | return; |
| 578 | } |
| 579 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 580 | pwait->conn = m; |
| 581 | pwait->wait_addr = wait_address; |
| 582 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); |
| 583 | add_wait_queue(wait_address, &pwait->wait); |
| 584 | } |
| 585 | |
| 586 | /** |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 587 | * p9_conn_create - initialize the per-session mux data |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 588 | * @client: client instance |
| 589 | * |
| 590 | * Note: Creates the polling task if this is the first session. |
| 591 | */ |
| 592 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 593 | static void p9_conn_create(struct p9_client *client) |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 594 | { |
Tejun Heo | 95820a3 | 2008-10-13 18:45:20 -0500 | [diff] [blame] | 595 | int n; |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 596 | struct p9_trans_fd *ts = client->trans; |
| 597 | struct p9_conn *m = &ts->conn; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 598 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 599 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 600 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 601 | INIT_LIST_HEAD(&m->mux_list); |
| 602 | m->client = client; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 603 | |
| 604 | INIT_LIST_HEAD(&m->req_list); |
| 605 | INIT_LIST_HEAD(&m->unsent_req_list); |
| 606 | INIT_WORK(&m->rq, p9_read_work); |
| 607 | INIT_WORK(&m->wq, p9_write_work); |
| 608 | INIT_LIST_HEAD(&m->poll_pending_link); |
| 609 | init_poll_funcptr(&m->pt, p9_pollwait); |
| 610 | |
| 611 | n = p9_fd_poll(client, &m->pt); |
| 612 | if (n & POLLIN) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 613 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 614 | set_bit(Rpending, &m->wsched); |
| 615 | } |
| 616 | |
| 617 | if (n & POLLOUT) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 618 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 619 | set_bit(Wpending, &m->wsched); |
| 620 | } |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 621 | } |
| 622 | |
| 623 | /** |
| 624 | * p9_poll_mux - polls a mux and schedules read or write works if necessary |
| 625 | * @m: connection to poll |
| 626 | * |
| 627 | */ |
| 628 | |
| 629 | static void p9_poll_mux(struct p9_conn *m) |
| 630 | { |
| 631 | int n; |
| 632 | |
| 633 | if (m->err < 0) |
| 634 | return; |
| 635 | |
| 636 | n = p9_fd_poll(m->client, NULL); |
| 637 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 638 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 639 | if (n >= 0) |
| 640 | n = -ECONNRESET; |
| 641 | p9_conn_cancel(m, n); |
| 642 | } |
| 643 | |
| 644 | if (n & POLLIN) { |
| 645 | set_bit(Rpending, &m->wsched); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 646 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 647 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 648 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
Tejun Heo | 61edeee | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 649 | schedule_work(&m->rq); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 650 | } |
| 651 | } |
| 652 | |
| 653 | if (n & POLLOUT) { |
| 654 | set_bit(Wpending, &m->wsched); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 655 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 656 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
| 657 | !test_and_set_bit(Wworksched, &m->wsched)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 658 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
Tejun Heo | 61edeee | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 659 | schedule_work(&m->wq); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 660 | } |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /** |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 665 | * p9_fd_request - send 9P request |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 666 | * The function can sleep until the request is scheduled for sending. |
| 667 | * The function can be interrupted. Return from the function is not |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 668 | * a guarantee that the request is sent successfully. |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 669 | * |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 670 | * @client: client instance |
| 671 | * @req: request to be sent |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 672 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 673 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 674 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 675 | 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] | 676 | { |
| 677 | int n; |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 678 | struct p9_trans_fd *ts = client->trans; |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 679 | struct p9_conn *m = &ts->conn; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 680 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 681 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
| 682 | m, current, req->tc, req->tc->id); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 683 | if (m->err < 0) |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 684 | return m->err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 685 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 686 | spin_lock(&client->lock); |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 687 | req->status = REQ_STATUS_UNSENT; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 688 | list_add_tail(&req->req_list, &m->unsent_req_list); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 689 | spin_unlock(&client->lock); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 690 | |
| 691 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 692 | n = POLLOUT; |
| 693 | else |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 694 | n = p9_fd_poll(m->client, NULL); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 695 | |
| 696 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
Tejun Heo | 61edeee | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 697 | schedule_work(&m->wq); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 698 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 699 | return 0; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 700 | } |
| 701 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 702 | 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] | 703 | { |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 704 | int ret = 1; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 705 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 706 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 707 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 708 | spin_lock(&client->lock); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 709 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 710 | if (req->status == REQ_STATUS_UNSENT) { |
Latchesar Ionkov | 1bab88b | 2009-04-05 16:28:59 -0500 | [diff] [blame] | 711 | list_del(&req->req_list); |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 712 | req->status = REQ_STATUS_FLSHD; |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 713 | ret = 0; |
Simon Derr | 0bfd684 | 2014-03-10 16:38:52 +0100 | [diff] [blame] | 714 | } |
Eric Van Hensbergen | 7eb923b | 2008-10-17 12:45:40 -0500 | [diff] [blame] | 715 | spin_unlock(&client->lock); |
| 716 | |
| 717 | return ret; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 718 | } |
| 719 | |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 720 | static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) |
| 721 | { |
| 722 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
| 723 | |
Wang Hai | 294711f | 2020-06-12 17:08:33 +0800 | [diff] [blame] | 724 | spin_lock(&client->lock); |
| 725 | /* Ignore cancelled request if message has been received |
| 726 | * before lock. |
| 727 | */ |
| 728 | if (req->status == REQ_STATUS_RCVD) { |
| 729 | spin_unlock(&client->lock); |
| 730 | return 0; |
| 731 | } |
| 732 | |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 733 | /* we haven't received a response for oldreq, |
| 734 | * remove it from the list. |
| 735 | */ |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 736 | list_del(&req->req_list); |
Wang Hai | 294711f | 2020-06-12 17:08:33 +0800 | [diff] [blame] | 737 | req->status = REQ_STATUS_FLSHD; |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 738 | spin_unlock(&client->lock); |
| 739 | |
| 740 | return 0; |
| 741 | } |
| 742 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 743 | /** |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 744 | * parse_opts - parse mount options into p9_fd_opts structure |
| 745 | * @params: options string passed from mount |
| 746 | * @opts: fd transport-specific structure to parse options into |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 747 | * |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 748 | * Returns 0 upon success, -ERRNO upon failure |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 749 | */ |
| 750 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 751 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 752 | { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 753 | char *p; |
| 754 | substring_t args[MAX_OPT_ARGS]; |
| 755 | int option; |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 756 | char *options, *tmp_options; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 757 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 758 | opts->port = P9_PORT; |
| 759 | opts->rfd = ~0; |
| 760 | opts->wfd = ~0; |
Dominique Martinet | b99baa4 | 2015-01-09 13:05:56 +0100 | [diff] [blame] | 761 | opts->privport = 0; |
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 | if (!params) |
| 764 | return 0; |
| 765 | |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 766 | tmp_options = kstrdup(params, GFP_KERNEL); |
| 767 | if (!tmp_options) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 768 | p9_debug(P9_DEBUG_ERROR, |
| 769 | "failed to allocate copy of option string\n"); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 770 | return -ENOMEM; |
| 771 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 772 | options = tmp_options; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 773 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 774 | while ((p = strsep(&options, ",")) != NULL) { |
| 775 | int token; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 776 | int r; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 777 | if (!*p) |
| 778 | continue; |
| 779 | token = match_token(p, tokens, args); |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 780 | if ((token != Opt_err) && (token != Opt_privport)) { |
Abhishek Kulkarni | 15da4b1 | 2009-07-01 08:50:54 +0000 | [diff] [blame] | 781 | r = match_int(&args[0], &option); |
| 782 | if (r < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 783 | p9_debug(P9_DEBUG_ERROR, |
| 784 | "integer field, but no integer?\n"); |
Abhishek Kulkarni | 15da4b1 | 2009-07-01 08:50:54 +0000 | [diff] [blame] | 785 | continue; |
| 786 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 787 | } |
| 788 | switch (token) { |
| 789 | case Opt_port: |
| 790 | opts->port = option; |
| 791 | break; |
| 792 | case Opt_rfdno: |
| 793 | opts->rfd = option; |
| 794 | break; |
| 795 | case Opt_wfdno: |
| 796 | opts->wfd = option; |
| 797 | break; |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 798 | case Opt_privport: |
| 799 | opts->privport = 1; |
| 800 | break; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 801 | default: |
| 802 | continue; |
| 803 | } |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 804 | } |
Eric Van Hensbergen | d8c8a9e | 2010-02-08 16:23:23 -0600 | [diff] [blame] | 805 | |
| 806 | kfree(tmp_options); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 807 | return 0; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 808 | } |
| 809 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 810 | 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] | 811 | { |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 812 | struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 813 | GFP_KERNEL); |
| 814 | if (!ts) |
| 815 | return -ENOMEM; |
| 816 | |
| 817 | ts->rd = fget(rfd); |
Christoph Hellwig | edd9097 | 2020-07-10 10:57:22 +0200 | [diff] [blame] | 818 | if (!ts->rd) |
| 819 | goto out_free_ts; |
| 820 | if (!(ts->rd->f_mode & FMODE_READ)) |
| 821 | goto out_put_rd; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 822 | ts->wr = fget(wfd); |
Christoph Hellwig | edd9097 | 2020-07-10 10:57:22 +0200 | [diff] [blame] | 823 | if (!ts->wr) |
| 824 | goto out_put_rd; |
| 825 | if (!(ts->wr->f_mode & FMODE_WRITE)) |
| 826 | goto out_put_wr; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 827 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 828 | client->trans = ts; |
| 829 | client->status = Connected; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 830 | |
| 831 | return 0; |
Christoph Hellwig | edd9097 | 2020-07-10 10:57:22 +0200 | [diff] [blame] | 832 | |
| 833 | out_put_wr: |
| 834 | fput(ts->wr); |
| 835 | out_put_rd: |
| 836 | fput(ts->rd); |
| 837 | out_free_ts: |
| 838 | kfree(ts); |
| 839 | return -EIO; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 840 | } |
| 841 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 842 | 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] | 843 | { |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 844 | struct p9_trans_fd *p; |
Al Viro | 56b31d1 | 2012-08-18 00:25:51 -0400 | [diff] [blame] | 845 | struct file *file; |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 846 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 847 | p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 848 | if (!p) |
| 849 | return -ENOMEM; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 850 | |
| 851 | csocket->sk->sk_allocation = GFP_NOIO; |
Linus Torvalds | aab174f | 2012-10-02 20:25:04 -0700 | [diff] [blame] | 852 | file = sock_alloc_file(csocket, 0, NULL); |
Al Viro | 56b31d1 | 2012-08-18 00:25:51 -0400 | [diff] [blame] | 853 | if (IS_ERR(file)) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 854 | pr_err("%s (%d): failed to map fd\n", |
| 855 | __func__, task_pid_nr(current)); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 856 | sock_release(csocket); |
| 857 | kfree(p); |
Al Viro | 56b31d1 | 2012-08-18 00:25:51 -0400 | [diff] [blame] | 858 | return PTR_ERR(file); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 859 | } |
| 860 | |
Al Viro | 56b31d1 | 2012-08-18 00:25:51 -0400 | [diff] [blame] | 861 | get_file(file); |
| 862 | p->wr = p->rd = file; |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 863 | client->trans = p; |
| 864 | client->status = Connected; |
| 865 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 866 | p->rd->f_flags |= O_NONBLOCK; |
| 867 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 868 | p9_conn_create(client); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 869 | return 0; |
| 870 | } |
| 871 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 872 | /** |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 873 | * p9_mux_destroy - cancels all pending requests of mux |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 874 | * @m: mux to destroy |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 875 | * |
| 876 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 877 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 878 | static void p9_conn_destroy(struct p9_conn *m) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 879 | { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 880 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
| 881 | m, m->mux_list.prev, m->mux_list.next); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 882 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 883 | p9_mux_poll_stop(m); |
| 884 | cancel_work_sync(&m->rq); |
| 885 | cancel_work_sync(&m->wq); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 886 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 887 | p9_conn_cancel(m, -ECONNRESET); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 888 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 889 | m->client = NULL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | /** |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 893 | * p9_fd_close - shutdown file descriptor transport |
| 894 | * @client: client instance |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 895 | * |
| 896 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 897 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 898 | static void p9_fd_close(struct p9_client *client) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 899 | { |
| 900 | struct p9_trans_fd *ts; |
| 901 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 902 | if (!client) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 903 | return; |
| 904 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 905 | ts = client->trans; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 906 | if (!ts) |
| 907 | return; |
| 908 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 909 | client->status = Disconnected; |
| 910 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 911 | p9_conn_destroy(&ts->conn); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 912 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 913 | if (ts->rd) |
| 914 | fput(ts->rd); |
| 915 | if (ts->wr) |
| 916 | fput(ts->wr); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 917 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 918 | kfree(ts); |
| 919 | } |
| 920 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 921 | /* |
| 922 | * stolen from NFS - maybe should be made a generic function? |
| 923 | */ |
| 924 | static inline int valid_ipaddr4(const char *buf) |
| 925 | { |
| 926 | int rc, count, in[4]; |
| 927 | |
| 928 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
| 929 | if (rc != 4) |
| 930 | return -EINVAL; |
| 931 | for (count = 0; count < 4; count++) { |
| 932 | if (in[count] > 255) |
| 933 | return -EINVAL; |
| 934 | } |
| 935 | return 0; |
| 936 | } |
| 937 | |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 938 | static int p9_bind_privport(struct socket *sock) |
| 939 | { |
| 940 | struct sockaddr_in cl; |
| 941 | int port, err = -EINVAL; |
| 942 | |
| 943 | memset(&cl, 0, sizeof(cl)); |
| 944 | cl.sin_family = AF_INET; |
| 945 | cl.sin_addr.s_addr = INADDR_ANY; |
| 946 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { |
| 947 | cl.sin_port = htons((ushort)port); |
| 948 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); |
| 949 | if (err != -EADDRINUSE) |
| 950 | break; |
| 951 | } |
| 952 | return err; |
| 953 | } |
| 954 | |
| 955 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 956 | static int |
| 957 | 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] | 958 | { |
| 959 | int err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 960 | struct socket *csocket; |
| 961 | struct sockaddr_in sin_server; |
| 962 | struct p9_fd_opts opts; |
| 963 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 964 | err = parse_opts(args, &opts); |
| 965 | if (err < 0) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 966 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 967 | |
Tomas Bortoli | 3ac733e | 2018-07-27 13:05:58 +0200 | [diff] [blame] | 968 | if (addr == NULL || valid_ipaddr4(addr) < 0) |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 969 | return -EINVAL; |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 970 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 971 | csocket = NULL; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 972 | |
| 973 | sin_server.sin_family = AF_INET; |
| 974 | sin_server.sin_addr.s_addr = in_aton(addr); |
| 975 | sin_server.sin_port = htons(opts.port); |
Eric W. Biederman | 0c5c9fb | 2015-03-11 23:06:44 -0500 | [diff] [blame] | 976 | err = __sock_create(current->nsproxy->net_ns, PF_INET, |
Rob Landley | e75762f | 2011-05-23 21:46:56 -0500 | [diff] [blame] | 977 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 978 | if (err) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 979 | pr_err("%s (%d): problem creating socket\n", |
| 980 | __func__, task_pid_nr(current)); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 981 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 982 | } |
| 983 | |
Jim Garlick | 2f28c8b | 2013-05-29 12:15:07 -0700 | [diff] [blame] | 984 | if (opts.privport) { |
| 985 | err = p9_bind_privport(csocket); |
| 986 | if (err < 0) { |
| 987 | pr_err("%s (%d): problem binding to privport\n", |
| 988 | __func__, task_pid_nr(current)); |
| 989 | sock_release(csocket); |
| 990 | return err; |
| 991 | } |
| 992 | } |
| 993 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 994 | err = csocket->ops->connect(csocket, |
| 995 | (struct sockaddr *)&sin_server, |
| 996 | sizeof(struct sockaddr_in), 0); |
| 997 | if (err < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 998 | pr_err("%s (%d): problem connecting socket to %s\n", |
| 999 | __func__, task_pid_nr(current), addr); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1000 | sock_release(csocket); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1001 | return err; |
| 1002 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1003 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1004 | return p9_socket_open(client, csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1005 | } |
| 1006 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1007 | static int |
| 1008 | 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] | 1009 | { |
| 1010 | int err; |
| 1011 | struct socket *csocket; |
| 1012 | struct sockaddr_un sun_server; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1013 | |
| 1014 | csocket = NULL; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1015 | |
Anant Thazhemadam | ff4a1985 | 2020-10-12 09:54:04 +0530 | [diff] [blame] | 1016 | if (!addr || !strlen(addr)) |
Tomas Bortoli | 3ac733e | 2018-07-27 13:05:58 +0200 | [diff] [blame] | 1017 | return -EINVAL; |
| 1018 | |
Dan Carpenter | cff6b8a | 2010-07-10 11:51:54 +0200 | [diff] [blame] | 1019 | if (strlen(addr) >= UNIX_PATH_MAX) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1020 | pr_err("%s (%d): address too long: %s\n", |
| 1021 | __func__, task_pid_nr(current), addr); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1022 | return -ENAMETOOLONG; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1023 | } |
| 1024 | |
| 1025 | sun_server.sun_family = PF_UNIX; |
| 1026 | strcpy(sun_server.sun_path, addr); |
Eric W. Biederman | 0c5c9fb | 2015-03-11 23:06:44 -0500 | [diff] [blame] | 1027 | err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
Rob Landley | e75762f | 2011-05-23 21:46:56 -0500 | [diff] [blame] | 1028 | SOCK_STREAM, 0, &csocket, 1); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1029 | if (err < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1030 | pr_err("%s (%d): problem creating socket\n", |
| 1031 | __func__, task_pid_nr(current)); |
| 1032 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1033 | return err; |
| 1034 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1035 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| 1036 | sizeof(struct sockaddr_un) - 1, 0); |
| 1037 | if (err < 0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1038 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
| 1039 | __func__, task_pid_nr(current), addr, err); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1040 | sock_release(csocket); |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1041 | return err; |
| 1042 | } |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1043 | |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1044 | return p9_socket_open(client, csocket); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1045 | } |
| 1046 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1047 | static int |
| 1048 | 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] | 1049 | { |
| 1050 | int err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1051 | struct p9_fd_opts opts; |
| 1052 | |
| 1053 | parse_opts(args, &opts); |
| 1054 | |
| 1055 | if (opts.rfd == ~0 || opts.wfd == ~0) { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1056 | pr_err("Insufficient options for proto=fd\n"); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1057 | return -ENOPROTOOPT; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1058 | } |
| 1059 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1060 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1061 | if (err < 0) |
Al Viro | 6b18662 | 2009-08-06 02:02:43 +0400 | [diff] [blame] | 1062 | return err; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1063 | |
Simon Derr | 263c582 | 2014-03-11 10:13:09 +0100 | [diff] [blame] | 1064 | p9_conn_create(client); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1065 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1066 | return 0; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1067 | } |
| 1068 | |
| 1069 | static struct p9_trans_module p9_tcp_trans = { |
| 1070 | .name = "tcp", |
| 1071 | .maxsize = MAX_SOCK_BUF, |
Eric Van Hensbergen | f94741f | 2013-11-12 10:20:03 -0600 | [diff] [blame] | 1072 | .def = 0, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1073 | .create = p9_fd_create_tcp, |
| 1074 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1075 | .request = p9_fd_request, |
| 1076 | .cancel = p9_fd_cancel, |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 1077 | .cancelled = p9_fd_cancelled, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1078 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1079 | }; |
| 1080 | |
| 1081 | static struct p9_trans_module p9_unix_trans = { |
| 1082 | .name = "unix", |
| 1083 | .maxsize = MAX_SOCK_BUF, |
| 1084 | .def = 0, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1085 | .create = p9_fd_create_unix, |
| 1086 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1087 | .request = p9_fd_request, |
| 1088 | .cancel = p9_fd_cancel, |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 1089 | .cancelled = p9_fd_cancelled, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1090 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1091 | }; |
| 1092 | |
| 1093 | static struct p9_trans_module p9_fd_trans = { |
| 1094 | .name = "fd", |
| 1095 | .maxsize = MAX_SOCK_BUF, |
| 1096 | .def = 0, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 1097 | .create = p9_fd_create, |
| 1098 | .close = p9_fd_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 1099 | .request = p9_fd_request, |
| 1100 | .cancel = p9_fd_cancel, |
Simon Derr | afd8d65 | 2014-03-10 16:38:49 +0100 | [diff] [blame] | 1101 | .cancelled = p9_fd_cancelled, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1102 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1103 | }; |
| 1104 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1105 | /** |
| 1106 | * p9_poll_proc - poll worker thread |
| 1107 | * @a: thread state and arguments |
| 1108 | * |
| 1109 | * polls all v9fs transports for new events and queues the appropriate |
| 1110 | * work to the work queue |
| 1111 | * |
| 1112 | */ |
| 1113 | |
Tejun Heo | aa70c58 | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 1114 | static void p9_poll_workfn(struct work_struct *work) |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1115 | { |
| 1116 | unsigned long flags; |
| 1117 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1118 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
Tejun Heo | aa70c58 | 2011-02-01 11:42:43 +0100 | [diff] [blame] | 1119 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1120 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 1121 | while (!list_empty(&p9_poll_pending_list)) { |
| 1122 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, |
| 1123 | struct p9_conn, |
| 1124 | poll_pending_link); |
| 1125 | list_del_init(&conn->poll_pending_link); |
| 1126 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 1127 | |
| 1128 | p9_poll_mux(conn); |
| 1129 | |
| 1130 | spin_lock_irqsave(&p9_poll_lock, flags); |
| 1131 | } |
| 1132 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
| 1133 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 1134 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1135 | } |
| 1136 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 1137 | int p9_trans_fd_init(void) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1138 | { |
| 1139 | v9fs_register_trans(&p9_tcp_trans); |
| 1140 | v9fs_register_trans(&p9_unix_trans); |
| 1141 | v9fs_register_trans(&p9_fd_trans); |
| 1142 | |
Andrew Morton | 3387b80 | 2008-03-28 14:15:57 -0700 | [diff] [blame] | 1143 | return 0; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1144 | } |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1145 | |
| 1146 | void p9_trans_fd_exit(void) |
| 1147 | { |
Tejun Heo | 4382973 | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 1148 | flush_work(&p9_poll_work); |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1149 | v9fs_unregister_trans(&p9_tcp_trans); |
| 1150 | v9fs_unregister_trans(&p9_unix_trans); |
| 1151 | v9fs_unregister_trans(&p9_fd_trans); |
| 1152 | } |