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> |
| 42 | #include <net/9p/transport.h> |
| 43 | |
| 44 | #define P9_PORT 564 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 45 | #define MAX_SOCK_BUF (64*1024) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 46 | #define ERREQFLUSH 1 |
| 47 | #define SCHED_TIMEOUT 10 |
| 48 | #define MAXPOLLWADDR 2 |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 49 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 50 | /** |
| 51 | * struct p9_fd_opts - per-transport options |
| 52 | * @rfd: file descriptor for reading (trans=fd) |
| 53 | * @wfd: file descriptor for writing (trans=fd) |
| 54 | * @port: port to connect to (trans=tcp) |
| 55 | * |
| 56 | */ |
| 57 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 58 | struct p9_fd_opts { |
| 59 | int rfd; |
| 60 | int wfd; |
| 61 | u16 port; |
| 62 | }; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 63 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 64 | |
| 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 | |
| 89 | static match_table_t tokens = { |
| 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 | |
| 103 | enum { |
| 104 | None, |
| 105 | Flushing, |
| 106 | Flushed, |
| 107 | }; |
| 108 | |
| 109 | struct p9_req; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 110 | typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 111 | |
| 112 | /** |
| 113 | * struct p9_req - fd mux encoding of an rpc transaction |
| 114 | * @lock: protects req_list |
| 115 | * @tag: numeric tag for rpc transaction |
| 116 | * @tcall: request &p9_fcall structure |
| 117 | * @rcall: response &p9_fcall structure |
| 118 | * @err: error state |
| 119 | * @cb: callback for when response is received |
| 120 | * @cba: argument to pass to callback |
| 121 | * @flush: flag to indicate RPC has been flushed |
| 122 | * @req_list: list link for higher level objects to chain requests |
| 123 | * |
| 124 | */ |
| 125 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 126 | struct p9_req { |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 127 | spinlock_t lock; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 128 | int tag; |
| 129 | struct p9_fcall *tcall; |
| 130 | struct p9_fcall *rcall; |
| 131 | int err; |
| 132 | p9_conn_req_callback cb; |
| 133 | void *cba; |
| 134 | int flush; |
| 135 | struct list_head req_list; |
| 136 | }; |
| 137 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 138 | struct p9_mux_poll_task { |
| 139 | struct task_struct *task; |
| 140 | struct list_head mux_list; |
| 141 | int muxnum; |
| 142 | }; |
| 143 | |
| 144 | /** |
| 145 | * struct p9_conn - fd mux connection state information |
| 146 | * @lock: protects mux_list (?) |
| 147 | * @mux_list: list link for mux to manage multiple connections (?) |
| 148 | * @poll_task: task polling on this connection |
| 149 | * @msize: maximum size for connection (dup) |
| 150 | * @extended: 9p2000.u flag (dup) |
| 151 | * @trans: reference to transport instance for this connection |
| 152 | * @tagpool: id accounting for transactions |
| 153 | * @err: error state |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 154 | * @req_list: accounting for requests which have been sent |
| 155 | * @unsent_req_list: accounting for requests that haven't been sent |
| 156 | * @rcall: current response &p9_fcall structure |
| 157 | * @rpos: read position in current frame |
| 158 | * @rbuf: current read buffer |
| 159 | * @wpos: write position for current frame |
| 160 | * @wsize: amount of data to write for current frame |
| 161 | * @wbuf: current write buffer |
| 162 | * @poll_wait: array of wait_q's for various worker threads |
| 163 | * @poll_waddr: ???? |
| 164 | * @pt: poll state |
| 165 | * @rq: current read work |
| 166 | * @wq: current write work |
| 167 | * @wsched: ???? |
| 168 | * |
| 169 | */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 170 | |
| 171 | struct p9_conn { |
| 172 | spinlock_t lock; /* protect lock structure */ |
| 173 | struct list_head mux_list; |
| 174 | struct p9_mux_poll_task *poll_task; |
| 175 | int msize; |
| 176 | unsigned char extended; |
| 177 | struct p9_trans *trans; |
| 178 | struct p9_idpool *tagpool; |
| 179 | int err; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 180 | struct list_head req_list; |
| 181 | struct list_head unsent_req_list; |
| 182 | struct p9_fcall *rcall; |
| 183 | int rpos; |
| 184 | char *rbuf; |
| 185 | int wpos; |
| 186 | int wsize; |
| 187 | char *wbuf; |
| 188 | wait_queue_t poll_wait[MAXPOLLWADDR]; |
| 189 | wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; |
| 190 | poll_table pt; |
| 191 | struct work_struct rq; |
| 192 | struct work_struct wq; |
| 193 | unsigned long wsched; |
| 194 | }; |
| 195 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 196 | /** |
| 197 | * struct p9_mux_rpc - fd mux rpc accounting structure |
| 198 | * @m: connection this request was issued on |
| 199 | * @err: error state |
| 200 | * @tcall: request &p9_fcall |
| 201 | * @rcall: response &p9_fcall |
| 202 | * @wqueue: wait queue that client is blocked on for this rpc |
| 203 | * |
| 204 | * Bug: isn't this information duplicated elsewhere like &p9_req |
| 205 | */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 206 | |
| 207 | struct p9_mux_rpc { |
| 208 | struct p9_conn *m; |
| 209 | int err; |
| 210 | struct p9_fcall *tcall; |
| 211 | struct p9_fcall *rcall; |
| 212 | wait_queue_head_t wqueue; |
| 213 | }; |
| 214 | |
| 215 | static int p9_poll_proc(void *); |
| 216 | static void p9_read_work(struct work_struct *work); |
| 217 | static void p9_write_work(struct work_struct *work); |
| 218 | static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, |
| 219 | poll_table *p); |
| 220 | static int p9_fd_write(struct p9_trans *trans, void *v, int len); |
| 221 | static int p9_fd_read(struct p9_trans *trans, void *v, int len); |
| 222 | |
| 223 | static DEFINE_MUTEX(p9_mux_task_lock); |
| 224 | static struct workqueue_struct *p9_mux_wq; |
| 225 | |
| 226 | static int p9_mux_num; |
| 227 | static int p9_mux_poll_task_num; |
| 228 | static struct p9_mux_poll_task p9_mux_poll_tasks[100]; |
| 229 | |
| 230 | static void p9_conn_destroy(struct p9_conn *); |
| 231 | static unsigned int p9_fd_poll(struct p9_trans *trans, |
| 232 | struct poll_table_struct *pt); |
| 233 | |
| 234 | #ifdef P9_NONBLOCK |
| 235 | static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
| 236 | p9_conn_req_callback cb, void *a); |
| 237 | #endif /* P9_NONBLOCK */ |
| 238 | |
| 239 | static void p9_conn_cancel(struct p9_conn *m, int err); |
| 240 | |
| 241 | static int p9_mux_global_init(void) |
| 242 | { |
| 243 | int i; |
| 244 | |
| 245 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) |
| 246 | p9_mux_poll_tasks[i].task = NULL; |
| 247 | |
| 248 | p9_mux_wq = create_workqueue("v9fs"); |
| 249 | if (!p9_mux_wq) { |
| 250 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); |
| 251 | return -ENOMEM; |
| 252 | } |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static u16 p9_mux_get_tag(struct p9_conn *m) |
| 258 | { |
| 259 | int tag; |
| 260 | |
| 261 | tag = p9_idpool_get(m->tagpool); |
| 262 | if (tag < 0) |
| 263 | return P9_NOTAG; |
| 264 | else |
| 265 | return (u16) tag; |
| 266 | } |
| 267 | |
| 268 | static void p9_mux_put_tag(struct p9_conn *m, u16 tag) |
| 269 | { |
| 270 | if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) |
| 271 | p9_idpool_put(tag, m->tagpool); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * p9_mux_calc_poll_procs - calculates the number of polling procs |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 276 | * @muxnum: number of mounts |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 277 | * |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 278 | * Calculation is based on the number of mounted v9fs filesystems. |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 279 | * The current implementation returns sqrt of the number of mounts. |
| 280 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 281 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 282 | static int p9_mux_calc_poll_procs(int muxnum) |
| 283 | { |
| 284 | int n; |
| 285 | |
| 286 | if (p9_mux_poll_task_num) |
| 287 | n = muxnum / p9_mux_poll_task_num + |
| 288 | (muxnum % p9_mux_poll_task_num ? 1 : 0); |
| 289 | else |
| 290 | n = 1; |
| 291 | |
| 292 | if (n > ARRAY_SIZE(p9_mux_poll_tasks)) |
| 293 | n = ARRAY_SIZE(p9_mux_poll_tasks); |
| 294 | |
| 295 | return n; |
| 296 | } |
| 297 | |
| 298 | static int p9_mux_poll_start(struct p9_conn *m) |
| 299 | { |
| 300 | int i, n; |
| 301 | struct p9_mux_poll_task *vpt, *vptlast; |
| 302 | struct task_struct *pproc; |
| 303 | |
| 304 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, |
| 305 | p9_mux_poll_task_num); |
| 306 | mutex_lock(&p9_mux_task_lock); |
| 307 | |
| 308 | n = p9_mux_calc_poll_procs(p9_mux_num + 1); |
| 309 | if (n > p9_mux_poll_task_num) { |
| 310 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { |
| 311 | if (p9_mux_poll_tasks[i].task == NULL) { |
| 312 | vpt = &p9_mux_poll_tasks[i]; |
| 313 | P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", |
| 314 | vpt); |
| 315 | pproc = kthread_create(p9_poll_proc, vpt, |
| 316 | "v9fs-poll"); |
| 317 | |
| 318 | if (!IS_ERR(pproc)) { |
| 319 | vpt->task = pproc; |
| 320 | INIT_LIST_HEAD(&vpt->mux_list); |
| 321 | vpt->muxnum = 0; |
| 322 | p9_mux_poll_task_num++; |
| 323 | wake_up_process(vpt->task); |
| 324 | } |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) |
| 330 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 331 | "warning: no free poll slots\n"); |
| 332 | } |
| 333 | |
| 334 | n = (p9_mux_num + 1) / p9_mux_poll_task_num + |
| 335 | ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); |
| 336 | |
| 337 | vptlast = NULL; |
| 338 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { |
| 339 | vpt = &p9_mux_poll_tasks[i]; |
| 340 | if (vpt->task != NULL) { |
| 341 | vptlast = vpt; |
| 342 | if (vpt->muxnum < n) { |
| 343 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); |
| 344 | list_add(&m->mux_list, &vpt->mux_list); |
| 345 | vpt->muxnum++; |
| 346 | m->poll_task = vpt; |
| 347 | memset(&m->poll_waddr, 0, |
| 348 | sizeof(m->poll_waddr)); |
| 349 | init_poll_funcptr(&m->pt, p9_pollwait); |
| 350 | break; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { |
| 356 | if (vptlast == NULL) { |
| 357 | mutex_unlock(&p9_mux_task_lock); |
| 358 | return -ENOMEM; |
| 359 | } |
| 360 | |
| 361 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); |
| 362 | list_add(&m->mux_list, &vptlast->mux_list); |
| 363 | vptlast->muxnum++; |
| 364 | m->poll_task = vptlast; |
| 365 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| 366 | init_poll_funcptr(&m->pt, p9_pollwait); |
| 367 | } |
| 368 | |
| 369 | p9_mux_num++; |
| 370 | mutex_unlock(&p9_mux_task_lock); |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | static void p9_mux_poll_stop(struct p9_conn *m) |
| 376 | { |
| 377 | int i; |
| 378 | struct p9_mux_poll_task *vpt; |
| 379 | |
| 380 | mutex_lock(&p9_mux_task_lock); |
| 381 | vpt = m->poll_task; |
| 382 | list_del(&m->mux_list); |
| 383 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| 384 | if (m->poll_waddr[i] != NULL) { |
| 385 | remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); |
| 386 | m->poll_waddr[i] = NULL; |
| 387 | } |
| 388 | } |
| 389 | vpt->muxnum--; |
| 390 | if (!vpt->muxnum) { |
| 391 | P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); |
| 392 | kthread_stop(vpt->task); |
| 393 | vpt->task = NULL; |
| 394 | p9_mux_poll_task_num--; |
| 395 | } |
| 396 | p9_mux_num--; |
| 397 | mutex_unlock(&p9_mux_task_lock); |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * p9_conn_create - allocate and initialize the per-session mux data |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 402 | * @trans: transport structure |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 403 | * |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 404 | * Note: Creates the polling task if this is the first session. |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 405 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 406 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 407 | static struct p9_conn *p9_conn_create(struct p9_trans *trans) |
| 408 | { |
| 409 | int i, n; |
| 410 | struct p9_conn *m, *mtmp; |
| 411 | |
| 412 | P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, |
| 413 | trans->msize); |
| 414 | m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL); |
| 415 | if (!m) |
| 416 | return ERR_PTR(-ENOMEM); |
| 417 | |
| 418 | spin_lock_init(&m->lock); |
| 419 | INIT_LIST_HEAD(&m->mux_list); |
| 420 | m->msize = trans->msize; |
| 421 | m->extended = trans->extended; |
| 422 | m->trans = trans; |
| 423 | m->tagpool = p9_idpool_create(); |
| 424 | if (IS_ERR(m->tagpool)) { |
| 425 | mtmp = ERR_PTR(-ENOMEM); |
| 426 | kfree(m); |
| 427 | return mtmp; |
| 428 | } |
| 429 | |
| 430 | m->err = 0; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 431 | INIT_LIST_HEAD(&m->req_list); |
| 432 | INIT_LIST_HEAD(&m->unsent_req_list); |
| 433 | m->rcall = NULL; |
| 434 | m->rpos = 0; |
| 435 | m->rbuf = NULL; |
| 436 | m->wpos = m->wsize = 0; |
| 437 | m->wbuf = NULL; |
| 438 | INIT_WORK(&m->rq, p9_read_work); |
| 439 | INIT_WORK(&m->wq, p9_write_work); |
| 440 | m->wsched = 0; |
| 441 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| 442 | m->poll_task = NULL; |
| 443 | n = p9_mux_poll_start(m); |
| 444 | if (n) { |
| 445 | kfree(m); |
| 446 | return ERR_PTR(n); |
| 447 | } |
| 448 | |
| 449 | n = p9_fd_poll(trans, &m->pt); |
| 450 | if (n & POLLIN) { |
| 451 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); |
| 452 | set_bit(Rpending, &m->wsched); |
| 453 | } |
| 454 | |
| 455 | if (n & POLLOUT) { |
| 456 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); |
| 457 | set_bit(Wpending, &m->wsched); |
| 458 | } |
| 459 | |
| 460 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| 461 | if (IS_ERR(m->poll_waddr[i])) { |
| 462 | p9_mux_poll_stop(m); |
| 463 | mtmp = (void *)m->poll_waddr; /* the error code */ |
| 464 | kfree(m); |
| 465 | m = mtmp; |
| 466 | break; |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | return m; |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 475 | * @m: mux to destroy |
| 476 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 477 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 478 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 479 | static void p9_conn_destroy(struct p9_conn *m) |
| 480 | { |
| 481 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, |
| 482 | m->mux_list.prev, m->mux_list.next); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 483 | |
| 484 | p9_mux_poll_stop(m); |
Tejun Heo | 7dc5d24 | 2008-09-24 16:22:23 -0500 | [diff] [blame^] | 485 | cancel_work_sync(&m->rq); |
| 486 | cancel_work_sync(&m->wq); |
| 487 | |
| 488 | p9_conn_cancel(m, -ECONNRESET); |
| 489 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 490 | m->trans = NULL; |
| 491 | p9_idpool_destroy(m->tagpool); |
| 492 | kfree(m); |
| 493 | } |
| 494 | |
| 495 | /** |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 496 | * p9_pollwait - add poll task to the wait queue |
| 497 | * @filp: file pointer being polled |
| 498 | * @wait_address: wait_q to block on |
| 499 | * @p: poll state |
| 500 | * |
| 501 | * called by files poll operation to add v9fs-poll task to files wait queue |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 502 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 503 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 504 | static void |
| 505 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) |
| 506 | { |
| 507 | int i; |
| 508 | struct p9_conn *m; |
| 509 | |
| 510 | m = container_of(p, struct p9_conn, pt); |
| 511 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) |
| 512 | if (m->poll_waddr[i] == NULL) |
| 513 | break; |
| 514 | |
| 515 | if (i >= ARRAY_SIZE(m->poll_waddr)) { |
| 516 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
| 517 | return; |
| 518 | } |
| 519 | |
| 520 | m->poll_waddr[i] = wait_address; |
| 521 | |
| 522 | if (!wait_address) { |
| 523 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); |
| 524 | m->poll_waddr[i] = ERR_PTR(-EIO); |
| 525 | return; |
| 526 | } |
| 527 | |
| 528 | init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); |
| 529 | add_wait_queue(wait_address, &m->poll_wait[i]); |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * p9_poll_mux - polls a mux and schedules read or write works if necessary |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 534 | * @m: connection to poll |
| 535 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 536 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 537 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 538 | static void p9_poll_mux(struct p9_conn *m) |
| 539 | { |
| 540 | int n; |
| 541 | |
| 542 | if (m->err < 0) |
| 543 | return; |
| 544 | |
| 545 | n = p9_fd_poll(m->trans, NULL); |
| 546 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
| 547 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); |
| 548 | if (n >= 0) |
| 549 | n = -ECONNRESET; |
| 550 | p9_conn_cancel(m, n); |
| 551 | } |
| 552 | |
| 553 | if (n & POLLIN) { |
| 554 | set_bit(Rpending, &m->wsched); |
| 555 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); |
| 556 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
| 557 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); |
| 558 | queue_work(p9_mux_wq, &m->rq); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | if (n & POLLOUT) { |
| 563 | set_bit(Wpending, &m->wsched); |
| 564 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); |
| 565 | if ((m->wsize || !list_empty(&m->unsent_req_list)) |
| 566 | && !test_and_set_bit(Wworksched, &m->wsched)) { |
| 567 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); |
| 568 | queue_work(p9_mux_wq, &m->wq); |
| 569 | } |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | /** |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 574 | * p9_poll_proc - poll worker thread |
| 575 | * @a: thread state and arguments |
| 576 | * |
| 577 | * polls all v9fs transports for new events and queues the appropriate |
| 578 | * work to the work queue |
| 579 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 580 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 581 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 582 | static int p9_poll_proc(void *a) |
| 583 | { |
| 584 | struct p9_conn *m, *mtmp; |
| 585 | struct p9_mux_poll_task *vpt; |
| 586 | |
| 587 | vpt = a; |
| 588 | P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); |
| 589 | while (!kthread_should_stop()) { |
| 590 | set_current_state(TASK_INTERRUPTIBLE); |
| 591 | |
| 592 | list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { |
| 593 | p9_poll_mux(m); |
| 594 | } |
| 595 | |
| 596 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); |
| 597 | schedule_timeout(SCHED_TIMEOUT * HZ); |
| 598 | } |
| 599 | |
| 600 | __set_current_state(TASK_RUNNING); |
| 601 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * p9_write_work - called when a transport can send some data |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 607 | * @work: container for work to be done |
| 608 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 609 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 610 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 611 | static void p9_write_work(struct work_struct *work) |
| 612 | { |
| 613 | int n, err; |
| 614 | struct p9_conn *m; |
| 615 | struct p9_req *req; |
| 616 | |
| 617 | m = container_of(work, struct p9_conn, wq); |
| 618 | |
| 619 | if (m->err < 0) { |
| 620 | clear_bit(Wworksched, &m->wsched); |
| 621 | return; |
| 622 | } |
| 623 | |
| 624 | if (!m->wsize) { |
| 625 | if (list_empty(&m->unsent_req_list)) { |
| 626 | clear_bit(Wworksched, &m->wsched); |
| 627 | return; |
| 628 | } |
| 629 | |
| 630 | spin_lock(&m->lock); |
| 631 | again: |
| 632 | req = list_entry(m->unsent_req_list.next, struct p9_req, |
| 633 | req_list); |
| 634 | list_move_tail(&req->req_list, &m->req_list); |
| 635 | if (req->err == ERREQFLUSH) |
| 636 | goto again; |
| 637 | |
| 638 | m->wbuf = req->tcall->sdata; |
| 639 | m->wsize = req->tcall->size; |
| 640 | m->wpos = 0; |
| 641 | spin_unlock(&m->lock); |
| 642 | } |
| 643 | |
| 644 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, |
| 645 | m->wsize); |
| 646 | clear_bit(Wpending, &m->wsched); |
| 647 | err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); |
| 648 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); |
| 649 | if (err == -EAGAIN) { |
| 650 | clear_bit(Wworksched, &m->wsched); |
| 651 | return; |
| 652 | } |
| 653 | |
| 654 | if (err < 0) |
| 655 | goto error; |
| 656 | else if (err == 0) { |
| 657 | err = -EREMOTEIO; |
| 658 | goto error; |
| 659 | } |
| 660 | |
| 661 | m->wpos += err; |
| 662 | if (m->wpos == m->wsize) |
| 663 | m->wpos = m->wsize = 0; |
| 664 | |
| 665 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { |
| 666 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 667 | n = POLLOUT; |
| 668 | else |
| 669 | n = p9_fd_poll(m->trans, NULL); |
| 670 | |
| 671 | if (n & POLLOUT) { |
| 672 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); |
| 673 | queue_work(p9_mux_wq, &m->wq); |
| 674 | } else |
| 675 | clear_bit(Wworksched, &m->wsched); |
| 676 | } else |
| 677 | clear_bit(Wworksched, &m->wsched); |
| 678 | |
| 679 | return; |
| 680 | |
| 681 | error: |
| 682 | p9_conn_cancel(m, err); |
| 683 | clear_bit(Wworksched, &m->wsched); |
| 684 | } |
| 685 | |
| 686 | static void process_request(struct p9_conn *m, struct p9_req *req) |
| 687 | { |
| 688 | int ecode; |
| 689 | struct p9_str *ename; |
| 690 | |
| 691 | if (!req->err && req->rcall->id == P9_RERROR) { |
| 692 | ecode = req->rcall->params.rerror.errno; |
| 693 | ename = &req->rcall->params.rerror.error; |
| 694 | |
| 695 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, |
| 696 | ename->str); |
| 697 | |
| 698 | if (m->extended) |
| 699 | req->err = -ecode; |
| 700 | |
| 701 | if (!req->err) { |
| 702 | req->err = p9_errstr2errno(ename->str, ename->len); |
| 703 | |
| 704 | /* string match failed */ |
| 705 | if (!req->err) { |
| 706 | PRINT_FCALL_ERROR("unknown error", req->rcall); |
| 707 | req->err = -ESERVERFAULT; |
| 708 | } |
| 709 | } |
| 710 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { |
| 711 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 712 | "fcall mismatch: expected %d, got %d\n", |
| 713 | req->tcall->id + 1, req->rcall->id); |
| 714 | if (!req->err) |
| 715 | req->err = -EIO; |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | /** |
| 720 | * 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] | 721 | * @work: container of work to be done |
| 722 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 723 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 724 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 725 | static void p9_read_work(struct work_struct *work) |
| 726 | { |
| 727 | int n, err; |
| 728 | struct p9_conn *m; |
| 729 | struct p9_req *req, *rptr, *rreq; |
| 730 | struct p9_fcall *rcall; |
| 731 | char *rbuf; |
| 732 | |
| 733 | m = container_of(work, struct p9_conn, rq); |
| 734 | |
| 735 | if (m->err < 0) |
| 736 | return; |
| 737 | |
| 738 | rcall = NULL; |
| 739 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); |
| 740 | |
| 741 | if (!m->rcall) { |
| 742 | m->rcall = |
| 743 | kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); |
| 744 | if (!m->rcall) { |
| 745 | err = -ENOMEM; |
| 746 | goto error; |
| 747 | } |
| 748 | |
| 749 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); |
| 750 | m->rpos = 0; |
| 751 | } |
| 752 | |
| 753 | clear_bit(Rpending, &m->wsched); |
| 754 | err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); |
| 755 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); |
| 756 | if (err == -EAGAIN) { |
| 757 | clear_bit(Rworksched, &m->wsched); |
| 758 | return; |
| 759 | } |
| 760 | |
| 761 | if (err <= 0) |
| 762 | goto error; |
| 763 | |
| 764 | m->rpos += err; |
| 765 | while (m->rpos > 4) { |
| 766 | n = le32_to_cpu(*(__le32 *) m->rbuf); |
| 767 | if (n >= m->msize) { |
| 768 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 769 | "requested packet size too big: %d\n", n); |
| 770 | err = -EIO; |
| 771 | goto error; |
| 772 | } |
| 773 | |
| 774 | if (m->rpos < n) |
| 775 | break; |
| 776 | |
| 777 | err = |
| 778 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); |
| 779 | if (err < 0) |
| 780 | goto error; |
| 781 | |
| 782 | #ifdef CONFIG_NET_9P_DEBUG |
| 783 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| 784 | char buf[150]; |
| 785 | |
| 786 | p9_printfcall(buf, sizeof(buf), m->rcall, |
| 787 | m->extended); |
| 788 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); |
| 789 | } |
| 790 | #endif |
| 791 | |
| 792 | rcall = m->rcall; |
| 793 | rbuf = m->rbuf; |
| 794 | if (m->rpos > n) { |
| 795 | m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, |
| 796 | GFP_KERNEL); |
| 797 | if (!m->rcall) { |
| 798 | err = -ENOMEM; |
| 799 | goto error; |
| 800 | } |
| 801 | |
| 802 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); |
| 803 | memmove(m->rbuf, rbuf + n, m->rpos - n); |
| 804 | m->rpos -= n; |
| 805 | } else { |
| 806 | m->rcall = NULL; |
| 807 | m->rbuf = NULL; |
| 808 | m->rpos = 0; |
| 809 | } |
| 810 | |
| 811 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, |
| 812 | rcall->id, rcall->tag); |
| 813 | |
| 814 | req = NULL; |
| 815 | spin_lock(&m->lock); |
| 816 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { |
| 817 | if (rreq->tag == rcall->tag) { |
| 818 | req = rreq; |
| 819 | if (req->flush != Flushing) |
| 820 | list_del(&req->req_list); |
| 821 | break; |
| 822 | } |
| 823 | } |
| 824 | spin_unlock(&m->lock); |
| 825 | |
| 826 | if (req) { |
| 827 | req->rcall = rcall; |
| 828 | process_request(m, req); |
| 829 | |
| 830 | if (req->flush != Flushing) { |
| 831 | if (req->cb) |
| 832 | (*req->cb) (req, req->cba); |
| 833 | else |
| 834 | kfree(req->rcall); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 835 | } |
| 836 | } else { |
| 837 | if (err >= 0 && rcall->id != P9_RFLUSH) |
| 838 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 839 | "unexpected response mux %p id %d tag %d\n", |
| 840 | m, rcall->id, rcall->tag); |
| 841 | kfree(rcall); |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | if (!list_empty(&m->req_list)) { |
| 846 | if (test_and_clear_bit(Rpending, &m->wsched)) |
| 847 | n = POLLIN; |
| 848 | else |
| 849 | n = p9_fd_poll(m->trans, NULL); |
| 850 | |
| 851 | if (n & POLLIN) { |
| 852 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); |
| 853 | queue_work(p9_mux_wq, &m->rq); |
| 854 | } else |
| 855 | clear_bit(Rworksched, &m->wsched); |
| 856 | } else |
| 857 | clear_bit(Rworksched, &m->wsched); |
| 858 | |
| 859 | return; |
| 860 | |
| 861 | error: |
| 862 | p9_conn_cancel(m, err); |
| 863 | clear_bit(Rworksched, &m->wsched); |
| 864 | } |
| 865 | |
| 866 | /** |
| 867 | * p9_send_request - send 9P request |
| 868 | * The function can sleep until the request is scheduled for sending. |
| 869 | * The function can be interrupted. Return from the function is not |
| 870 | * a guarantee that the request is sent successfully. Can return errors |
| 871 | * that can be retrieved by PTR_ERR macros. |
| 872 | * |
| 873 | * @m: mux data |
| 874 | * @tc: request to be sent |
| 875 | * @cb: callback function to call when response is received |
| 876 | * @cba: parameter to pass to the callback function |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 877 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 878 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 879 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 880 | static struct p9_req *p9_send_request(struct p9_conn *m, |
| 881 | struct p9_fcall *tc, |
| 882 | p9_conn_req_callback cb, void *cba) |
| 883 | { |
| 884 | int n; |
| 885 | struct p9_req *req; |
| 886 | |
| 887 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, |
| 888 | tc, tc->id); |
| 889 | if (m->err < 0) |
| 890 | return ERR_PTR(m->err); |
| 891 | |
| 892 | req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); |
| 893 | if (!req) |
| 894 | return ERR_PTR(-ENOMEM); |
| 895 | |
| 896 | if (tc->id == P9_TVERSION) |
| 897 | n = P9_NOTAG; |
| 898 | else |
| 899 | n = p9_mux_get_tag(m); |
| 900 | |
| 901 | if (n < 0) |
| 902 | return ERR_PTR(-ENOMEM); |
| 903 | |
| 904 | p9_set_tag(tc, n); |
| 905 | |
| 906 | #ifdef CONFIG_NET_9P_DEBUG |
| 907 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| 908 | char buf[150]; |
| 909 | |
| 910 | p9_printfcall(buf, sizeof(buf), tc, m->extended); |
| 911 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); |
| 912 | } |
| 913 | #endif |
| 914 | |
| 915 | spin_lock_init(&req->lock); |
| 916 | req->tag = n; |
| 917 | req->tcall = tc; |
| 918 | req->rcall = NULL; |
| 919 | req->err = 0; |
| 920 | req->cb = cb; |
| 921 | req->cba = cba; |
| 922 | req->flush = None; |
| 923 | |
| 924 | spin_lock(&m->lock); |
| 925 | list_add_tail(&req->req_list, &m->unsent_req_list); |
| 926 | spin_unlock(&m->lock); |
| 927 | |
| 928 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 929 | n = POLLOUT; |
| 930 | else |
| 931 | n = p9_fd_poll(m->trans, NULL); |
| 932 | |
| 933 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
| 934 | queue_work(p9_mux_wq, &m->wq); |
| 935 | |
| 936 | return req; |
| 937 | } |
| 938 | |
| 939 | static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) |
| 940 | { |
| 941 | p9_mux_put_tag(m, req->tag); |
| 942 | kfree(req); |
| 943 | } |
| 944 | |
| 945 | static void p9_mux_flush_cb(struct p9_req *freq, void *a) |
| 946 | { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 947 | int tag; |
| 948 | struct p9_conn *m; |
| 949 | struct p9_req *req, *rreq, *rptr; |
| 950 | |
| 951 | m = a; |
| 952 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, |
| 953 | freq->tcall, freq->rcall, freq->err, |
| 954 | freq->tcall->params.tflush.oldtag); |
| 955 | |
| 956 | spin_lock(&m->lock); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 957 | tag = freq->tcall->params.tflush.oldtag; |
| 958 | req = NULL; |
| 959 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { |
| 960 | if (rreq->tag == tag) { |
| 961 | req = rreq; |
| 962 | list_del(&req->req_list); |
| 963 | break; |
| 964 | } |
| 965 | } |
| 966 | spin_unlock(&m->lock); |
| 967 | |
| 968 | if (req) { |
| 969 | spin_lock(&req->lock); |
| 970 | req->flush = Flushed; |
| 971 | spin_unlock(&req->lock); |
| 972 | |
| 973 | if (req->cb) |
| 974 | (*req->cb) (req, req->cba); |
| 975 | else |
| 976 | kfree(req->rcall); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | kfree(freq->tcall); |
| 980 | kfree(freq->rcall); |
| 981 | p9_mux_free_request(m, freq); |
| 982 | } |
| 983 | |
| 984 | static int |
| 985 | p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) |
| 986 | { |
| 987 | struct p9_fcall *fc; |
| 988 | struct p9_req *rreq, *rptr; |
| 989 | |
| 990 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); |
| 991 | |
| 992 | /* if a response was received for a request, do nothing */ |
| 993 | spin_lock(&req->lock); |
| 994 | if (req->rcall || req->err) { |
| 995 | spin_unlock(&req->lock); |
| 996 | P9_DPRINTK(P9_DEBUG_MUX, |
| 997 | "mux %p req %p response already received\n", m, req); |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | req->flush = Flushing; |
| 1002 | spin_unlock(&req->lock); |
| 1003 | |
| 1004 | spin_lock(&m->lock); |
| 1005 | /* if the request is not sent yet, just remove it from the list */ |
| 1006 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { |
| 1007 | if (rreq->tag == req->tag) { |
| 1008 | P9_DPRINTK(P9_DEBUG_MUX, |
| 1009 | "mux %p req %p request is not sent yet\n", m, req); |
| 1010 | list_del(&rreq->req_list); |
| 1011 | req->flush = Flushed; |
| 1012 | spin_unlock(&m->lock); |
| 1013 | if (req->cb) |
| 1014 | (*req->cb) (req, req->cba); |
| 1015 | return 0; |
| 1016 | } |
| 1017 | } |
| 1018 | spin_unlock(&m->lock); |
| 1019 | |
| 1020 | clear_thread_flag(TIF_SIGPENDING); |
| 1021 | fc = p9_create_tflush(req->tag); |
| 1022 | p9_send_request(m, fc, p9_mux_flush_cb, m); |
| 1023 | return 1; |
| 1024 | } |
| 1025 | |
| 1026 | static void |
| 1027 | p9_conn_rpc_cb(struct p9_req *req, void *a) |
| 1028 | { |
| 1029 | struct p9_mux_rpc *r; |
| 1030 | |
| 1031 | P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); |
| 1032 | r = a; |
| 1033 | r->rcall = req->rcall; |
| 1034 | r->err = req->err; |
| 1035 | |
| 1036 | if (req->flush != None && !req->err) |
| 1037 | r->err = -ERESTARTSYS; |
| 1038 | |
| 1039 | wake_up(&r->wqueue); |
| 1040 | } |
| 1041 | |
| 1042 | /** |
| 1043 | * p9_fd_rpc- sends 9P request and waits until a response is available. |
| 1044 | * The function can be interrupted. |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1045 | * @t: transport data |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1046 | * @tc: request to be sent |
| 1047 | * @rc: pointer where a pointer to the response is stored |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1048 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1049 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1050 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1051 | int |
| 1052 | p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) |
| 1053 | { |
| 1054 | struct p9_trans_fd *p = t->priv; |
| 1055 | struct p9_conn *m = p->conn; |
| 1056 | int err, sigpending; |
| 1057 | unsigned long flags; |
| 1058 | struct p9_req *req; |
| 1059 | struct p9_mux_rpc r; |
| 1060 | |
| 1061 | r.err = 0; |
| 1062 | r.tcall = tc; |
| 1063 | r.rcall = NULL; |
| 1064 | r.m = m; |
| 1065 | init_waitqueue_head(&r.wqueue); |
| 1066 | |
| 1067 | if (rc) |
| 1068 | *rc = NULL; |
| 1069 | |
| 1070 | sigpending = 0; |
| 1071 | if (signal_pending(current)) { |
| 1072 | sigpending = 1; |
| 1073 | clear_thread_flag(TIF_SIGPENDING); |
| 1074 | } |
| 1075 | |
| 1076 | req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); |
| 1077 | if (IS_ERR(req)) { |
| 1078 | err = PTR_ERR(req); |
| 1079 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); |
| 1080 | return err; |
| 1081 | } |
| 1082 | |
| 1083 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); |
| 1084 | if (r.err < 0) |
| 1085 | err = r.err; |
| 1086 | |
| 1087 | if (err == -ERESTARTSYS && m->trans->status == Connected |
| 1088 | && m->err == 0) { |
| 1089 | if (p9_mux_flush_request(m, req)) { |
| 1090 | /* wait until we get response of the flush message */ |
| 1091 | do { |
| 1092 | clear_thread_flag(TIF_SIGPENDING); |
| 1093 | err = wait_event_interruptible(r.wqueue, |
| 1094 | r.rcall || r.err); |
| 1095 | } while (!r.rcall && !r.err && err == -ERESTARTSYS && |
| 1096 | m->trans->status == Connected && !m->err); |
| 1097 | |
| 1098 | err = -ERESTARTSYS; |
| 1099 | } |
| 1100 | sigpending = 1; |
| 1101 | } |
| 1102 | |
| 1103 | if (sigpending) { |
| 1104 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 1105 | recalc_sigpending(); |
| 1106 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 1107 | } |
| 1108 | |
| 1109 | if (rc) |
| 1110 | *rc = r.rcall; |
| 1111 | else |
| 1112 | kfree(r.rcall); |
| 1113 | |
| 1114 | p9_mux_free_request(m, req); |
| 1115 | if (err > 0) |
| 1116 | err = -EIO; |
| 1117 | |
| 1118 | return err; |
| 1119 | } |
| 1120 | |
| 1121 | #ifdef P9_NONBLOCK |
| 1122 | /** |
| 1123 | * p9_conn_rpcnb - sends 9P request without waiting for response. |
| 1124 | * @m: mux data |
| 1125 | * @tc: request to be sent |
| 1126 | * @cb: callback function to be called when response arrives |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1127 | * @a: value to pass to the callback function |
| 1128 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1129 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1130 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1131 | int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
| 1132 | p9_conn_req_callback cb, void *a) |
| 1133 | { |
| 1134 | int err; |
| 1135 | struct p9_req *req; |
| 1136 | |
| 1137 | req = p9_send_request(m, tc, cb, a); |
| 1138 | if (IS_ERR(req)) { |
| 1139 | err = PTR_ERR(req); |
| 1140 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); |
| 1141 | return PTR_ERR(req); |
| 1142 | } |
| 1143 | |
| 1144 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); |
| 1145 | return 0; |
| 1146 | } |
| 1147 | #endif /* P9_NONBLOCK */ |
| 1148 | |
| 1149 | /** |
| 1150 | * p9_conn_cancel - cancel all pending requests with error |
| 1151 | * @m: mux data |
| 1152 | * @err: error code |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1153 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1154 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1155 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1156 | void p9_conn_cancel(struct p9_conn *m, int err) |
| 1157 | { |
| 1158 | struct p9_req *req, *rtmp; |
| 1159 | LIST_HEAD(cancel_list); |
| 1160 | |
| 1161 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
| 1162 | m->err = err; |
| 1163 | spin_lock(&m->lock); |
| 1164 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
| 1165 | list_move(&req->req_list, &cancel_list); |
| 1166 | } |
| 1167 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
| 1168 | list_move(&req->req_list, &cancel_list); |
| 1169 | } |
| 1170 | spin_unlock(&m->lock); |
| 1171 | |
| 1172 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
| 1173 | list_del(&req->req_list); |
| 1174 | if (!req->err) |
| 1175 | req->err = err; |
| 1176 | |
| 1177 | if (req->cb) |
| 1178 | (*req->cb) (req, req->cba); |
| 1179 | else |
| 1180 | kfree(req->rcall); |
| 1181 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1182 | } |
| 1183 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1184 | /** |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1185 | * parse_options - parse mount options into session structure |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1186 | * @options: options string passed from mount |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1187 | * @opts: transport-specific structure to parse options into |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1188 | * |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1189 | * Returns 0 upon success, -ERRNO upon failure |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1190 | */ |
| 1191 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1192 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1193 | { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1194 | char *p; |
| 1195 | substring_t args[MAX_OPT_ARGS]; |
| 1196 | int option; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1197 | char *options; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1198 | int ret; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1199 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1200 | opts->port = P9_PORT; |
| 1201 | opts->rfd = ~0; |
| 1202 | opts->wfd = ~0; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1203 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1204 | if (!params) |
| 1205 | return 0; |
| 1206 | |
| 1207 | options = kstrdup(params, GFP_KERNEL); |
| 1208 | if (!options) { |
| 1209 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 1210 | "failed to allocate copy of option string\n"); |
| 1211 | return -ENOMEM; |
| 1212 | } |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1213 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1214 | while ((p = strsep(&options, ",")) != NULL) { |
| 1215 | int token; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1216 | int r; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1217 | if (!*p) |
| 1218 | continue; |
| 1219 | token = match_token(p, tokens, args); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1220 | r = match_int(&args[0], &option); |
| 1221 | if (r < 0) { |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1222 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 1223 | "integer field, but no integer?\n"); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1224 | ret = r; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1225 | continue; |
| 1226 | } |
| 1227 | switch (token) { |
| 1228 | case Opt_port: |
| 1229 | opts->port = option; |
| 1230 | break; |
| 1231 | case Opt_rfdno: |
| 1232 | opts->rfd = option; |
| 1233 | break; |
| 1234 | case Opt_wfdno: |
| 1235 | opts->wfd = option; |
| 1236 | break; |
| 1237 | default: |
| 1238 | continue; |
| 1239 | } |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1240 | } |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1241 | kfree(options); |
| 1242 | return 0; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1243 | } |
| 1244 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1245 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1246 | { |
| 1247 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
| 1248 | GFP_KERNEL); |
| 1249 | if (!ts) |
| 1250 | return -ENOMEM; |
| 1251 | |
| 1252 | ts->rd = fget(rfd); |
| 1253 | ts->wr = fget(wfd); |
| 1254 | if (!ts->rd || !ts->wr) { |
| 1255 | if (ts->rd) |
| 1256 | fput(ts->rd); |
| 1257 | if (ts->wr) |
| 1258 | fput(ts->wr); |
| 1259 | kfree(ts); |
| 1260 | return -EIO; |
| 1261 | } |
| 1262 | |
| 1263 | trans->priv = ts; |
| 1264 | trans->status = Connected; |
| 1265 | |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1269 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
| 1270 | { |
| 1271 | int fd, ret; |
| 1272 | |
| 1273 | csocket->sk->sk_allocation = GFP_NOIO; |
Ulrich Drepper | a677a03 | 2008-07-23 21:29:17 -0700 | [diff] [blame] | 1274 | fd = sock_map_fd(csocket, 0); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1275 | if (fd < 0) { |
| 1276 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); |
| 1277 | return fd; |
| 1278 | } |
| 1279 | |
| 1280 | ret = p9_fd_open(trans, fd, fd); |
| 1281 | if (ret < 0) { |
| 1282 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); |
| 1283 | sockfd_put(csocket); |
| 1284 | return ret; |
| 1285 | } |
| 1286 | |
| 1287 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; |
| 1288 | |
| 1289 | return 0; |
| 1290 | } |
| 1291 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1292 | /** |
| 1293 | * p9_fd_read- read from a fd |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1294 | * @trans: transport instance state |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1295 | * @v: buffer to receive data into |
| 1296 | * @len: size of receive buffer |
| 1297 | * |
| 1298 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1299 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1300 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1301 | { |
| 1302 | int ret; |
| 1303 | struct p9_trans_fd *ts = NULL; |
| 1304 | |
| 1305 | if (trans && trans->status != Disconnected) |
| 1306 | ts = trans->priv; |
| 1307 | |
| 1308 | if (!ts) |
| 1309 | return -EREMOTEIO; |
| 1310 | |
| 1311 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
| 1312 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); |
| 1313 | |
| 1314 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
| 1315 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 1316 | trans->status = Disconnected; |
| 1317 | return ret; |
| 1318 | } |
| 1319 | |
| 1320 | /** |
| 1321 | * p9_fd_write - write to a socket |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1322 | * @trans: transport instance state |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1323 | * @v: buffer to send data from |
| 1324 | * @len: size of send buffer |
| 1325 | * |
| 1326 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1327 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1328 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1329 | { |
| 1330 | int ret; |
| 1331 | mm_segment_t oldfs; |
| 1332 | struct p9_trans_fd *ts = NULL; |
| 1333 | |
| 1334 | if (trans && trans->status != Disconnected) |
| 1335 | ts = trans->priv; |
| 1336 | |
| 1337 | if (!ts) |
| 1338 | return -EREMOTEIO; |
| 1339 | |
| 1340 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
| 1341 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); |
| 1342 | |
| 1343 | oldfs = get_fs(); |
| 1344 | set_fs(get_ds()); |
| 1345 | /* The cast to a user pointer is valid due to the set_fs() */ |
| 1346 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); |
| 1347 | set_fs(oldfs); |
| 1348 | |
| 1349 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| 1350 | trans->status = Disconnected; |
| 1351 | return ret; |
| 1352 | } |
| 1353 | |
| 1354 | static unsigned int |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1355 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1356 | { |
| 1357 | int ret, n; |
| 1358 | struct p9_trans_fd *ts = NULL; |
| 1359 | mm_segment_t oldfs; |
| 1360 | |
| 1361 | if (trans && trans->status == Connected) |
| 1362 | ts = trans->priv; |
| 1363 | |
| 1364 | if (!ts) |
| 1365 | return -EREMOTEIO; |
| 1366 | |
| 1367 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
| 1368 | return -EIO; |
| 1369 | |
| 1370 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
| 1371 | return -EIO; |
| 1372 | |
| 1373 | oldfs = get_fs(); |
| 1374 | set_fs(get_ds()); |
| 1375 | |
| 1376 | ret = ts->rd->f_op->poll(ts->rd, pt); |
| 1377 | if (ret < 0) |
| 1378 | goto end; |
| 1379 | |
| 1380 | if (ts->rd != ts->wr) { |
| 1381 | n = ts->wr->f_op->poll(ts->wr, pt); |
| 1382 | if (n < 0) { |
| 1383 | ret = n; |
| 1384 | goto end; |
| 1385 | } |
| 1386 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
| 1387 | } |
| 1388 | |
| 1389 | end: |
| 1390 | set_fs(oldfs); |
| 1391 | return ret; |
| 1392 | } |
| 1393 | |
| 1394 | /** |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1395 | * p9_fd_close - shutdown socket |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1396 | * @trans: private socket structure |
| 1397 | * |
| 1398 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 1399 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1400 | static void p9_fd_close(struct p9_trans *trans) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1401 | { |
| 1402 | struct p9_trans_fd *ts; |
| 1403 | |
| 1404 | if (!trans) |
| 1405 | return; |
| 1406 | |
| 1407 | ts = xchg(&trans->priv, NULL); |
| 1408 | |
| 1409 | if (!ts) |
| 1410 | return; |
| 1411 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1412 | p9_conn_destroy(ts->conn); |
| 1413 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1414 | trans->status = Disconnected; |
| 1415 | if (ts->rd) |
| 1416 | fput(ts->rd); |
| 1417 | if (ts->wr) |
| 1418 | fput(ts->wr); |
| 1419 | kfree(ts); |
| 1420 | } |
| 1421 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 1422 | /* |
| 1423 | * stolen from NFS - maybe should be made a generic function? |
| 1424 | */ |
| 1425 | static inline int valid_ipaddr4(const char *buf) |
| 1426 | { |
| 1427 | int rc, count, in[4]; |
| 1428 | |
| 1429 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
| 1430 | if (rc != 4) |
| 1431 | return -EINVAL; |
| 1432 | for (count = 0; count < 4; count++) { |
| 1433 | if (in[count] > 255) |
| 1434 | return -EINVAL; |
| 1435 | } |
| 1436 | return 0; |
| 1437 | } |
| 1438 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1439 | static struct p9_trans * |
| 1440 | p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1441 | { |
| 1442 | int err; |
| 1443 | struct p9_trans *trans; |
| 1444 | struct socket *csocket; |
| 1445 | struct sockaddr_in sin_server; |
| 1446 | struct p9_fd_opts opts; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1447 | struct p9_trans_fd *p; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1448 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 1449 | err = parse_opts(args, &opts); |
| 1450 | if (err < 0) |
| 1451 | return ERR_PTR(err); |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1452 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 1453 | if (valid_ipaddr4(addr) < 0) |
| 1454 | return ERR_PTR(-EINVAL); |
| 1455 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1456 | csocket = NULL; |
| 1457 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| 1458 | if (!trans) |
| 1459 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1460 | trans->msize = msize; |
| 1461 | trans->extended = dotu; |
| 1462 | trans->rpc = p9_fd_rpc; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1463 | trans->close = p9_fd_close; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1464 | |
| 1465 | sin_server.sin_family = AF_INET; |
| 1466 | sin_server.sin_addr.s_addr = in_aton(addr); |
| 1467 | sin_server.sin_port = htons(opts.port); |
| 1468 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); |
| 1469 | |
| 1470 | if (!csocket) { |
| 1471 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); |
| 1472 | err = -EIO; |
| 1473 | goto error; |
| 1474 | } |
| 1475 | |
| 1476 | err = csocket->ops->connect(csocket, |
| 1477 | (struct sockaddr *)&sin_server, |
| 1478 | sizeof(struct sockaddr_in), 0); |
| 1479 | if (err < 0) { |
| 1480 | P9_EPRINTK(KERN_ERR, |
| 1481 | "p9_trans_tcp: problem connecting socket to %s\n", |
| 1482 | addr); |
| 1483 | goto error; |
| 1484 | } |
| 1485 | |
| 1486 | err = p9_socket_open(trans, csocket); |
| 1487 | if (err < 0) |
| 1488 | goto error; |
| 1489 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1490 | p = (struct p9_trans_fd *) trans->priv; |
| 1491 | p->conn = p9_conn_create(trans); |
| 1492 | if (IS_ERR(p->conn)) { |
| 1493 | err = PTR_ERR(p->conn); |
| 1494 | p->conn = NULL; |
| 1495 | goto error; |
| 1496 | } |
| 1497 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1498 | return trans; |
| 1499 | |
| 1500 | error: |
| 1501 | if (csocket) |
| 1502 | sock_release(csocket); |
| 1503 | |
| 1504 | kfree(trans); |
| 1505 | return ERR_PTR(err); |
| 1506 | } |
| 1507 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1508 | static struct p9_trans * |
| 1509 | p9_trans_create_unix(const char *addr, char *args, int msize, |
| 1510 | unsigned char dotu) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1511 | { |
| 1512 | int err; |
| 1513 | struct socket *csocket; |
| 1514 | struct sockaddr_un sun_server; |
| 1515 | struct p9_trans *trans; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1516 | struct p9_trans_fd *p; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1517 | |
| 1518 | csocket = NULL; |
| 1519 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| 1520 | if (!trans) |
| 1521 | return ERR_PTR(-ENOMEM); |
| 1522 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1523 | trans->rpc = p9_fd_rpc; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1524 | trans->close = p9_fd_close; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1525 | |
| 1526 | if (strlen(addr) > UNIX_PATH_MAX) { |
| 1527 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", |
| 1528 | addr); |
| 1529 | err = -ENAMETOOLONG; |
| 1530 | goto error; |
| 1531 | } |
| 1532 | |
| 1533 | sun_server.sun_family = PF_UNIX; |
| 1534 | strcpy(sun_server.sun_path, addr); |
| 1535 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); |
| 1536 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| 1537 | sizeof(struct sockaddr_un) - 1, 0); |
| 1538 | if (err < 0) { |
| 1539 | P9_EPRINTK(KERN_ERR, |
| 1540 | "p9_trans_unix: problem connecting socket: %s: %d\n", |
| 1541 | addr, err); |
| 1542 | goto error; |
| 1543 | } |
| 1544 | |
| 1545 | err = p9_socket_open(trans, csocket); |
| 1546 | if (err < 0) |
| 1547 | goto error; |
| 1548 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1549 | trans->msize = msize; |
| 1550 | trans->extended = dotu; |
| 1551 | p = (struct p9_trans_fd *) trans->priv; |
| 1552 | p->conn = p9_conn_create(trans); |
| 1553 | if (IS_ERR(p->conn)) { |
| 1554 | err = PTR_ERR(p->conn); |
| 1555 | p->conn = NULL; |
| 1556 | goto error; |
| 1557 | } |
| 1558 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1559 | return trans; |
| 1560 | |
| 1561 | error: |
| 1562 | if (csocket) |
| 1563 | sock_release(csocket); |
| 1564 | |
| 1565 | kfree(trans); |
| 1566 | return ERR_PTR(err); |
| 1567 | } |
| 1568 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1569 | static struct p9_trans * |
| 1570 | p9_trans_create_fd(const char *name, char *args, int msize, |
| 1571 | unsigned char extended) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1572 | { |
| 1573 | int err; |
| 1574 | struct p9_trans *trans; |
| 1575 | struct p9_fd_opts opts; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1576 | struct p9_trans_fd *p; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1577 | |
| 1578 | parse_opts(args, &opts); |
| 1579 | |
| 1580 | if (opts.rfd == ~0 || opts.wfd == ~0) { |
| 1581 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); |
| 1582 | return ERR_PTR(-ENOPROTOOPT); |
| 1583 | } |
| 1584 | |
| 1585 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| 1586 | if (!trans) |
| 1587 | return ERR_PTR(-ENOMEM); |
| 1588 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1589 | trans->rpc = p9_fd_rpc; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1590 | trans->close = p9_fd_close; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1591 | |
| 1592 | err = p9_fd_open(trans, opts.rfd, opts.wfd); |
| 1593 | if (err < 0) |
| 1594 | goto error; |
| 1595 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1596 | trans->msize = msize; |
| 1597 | trans->extended = extended; |
| 1598 | p = (struct p9_trans_fd *) trans->priv; |
| 1599 | p->conn = p9_conn_create(trans); |
| 1600 | if (IS_ERR(p->conn)) { |
| 1601 | err = PTR_ERR(p->conn); |
| 1602 | p->conn = NULL; |
| 1603 | goto error; |
| 1604 | } |
| 1605 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1606 | return trans; |
| 1607 | |
| 1608 | error: |
| 1609 | kfree(trans); |
| 1610 | return ERR_PTR(err); |
| 1611 | } |
| 1612 | |
| 1613 | static struct p9_trans_module p9_tcp_trans = { |
| 1614 | .name = "tcp", |
| 1615 | .maxsize = MAX_SOCK_BUF, |
| 1616 | .def = 1, |
| 1617 | .create = p9_trans_create_tcp, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1618 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1619 | }; |
| 1620 | |
| 1621 | static struct p9_trans_module p9_unix_trans = { |
| 1622 | .name = "unix", |
| 1623 | .maxsize = MAX_SOCK_BUF, |
| 1624 | .def = 0, |
| 1625 | .create = p9_trans_create_unix, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1626 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1627 | }; |
| 1628 | |
| 1629 | static struct p9_trans_module p9_fd_trans = { |
| 1630 | .name = "fd", |
| 1631 | .maxsize = MAX_SOCK_BUF, |
| 1632 | .def = 0, |
| 1633 | .create = p9_trans_create_fd, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1634 | .owner = THIS_MODULE, |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1635 | }; |
| 1636 | |
Eric Van Hensbergen | 887b3ec | 2008-05-08 20:26:37 -0500 | [diff] [blame] | 1637 | int p9_trans_fd_init(void) |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1638 | { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 1639 | int ret = p9_mux_global_init(); |
| 1640 | if (ret) { |
| 1641 | printk(KERN_WARNING "9p: starting mux failed\n"); |
| 1642 | return ret; |
| 1643 | } |
| 1644 | |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1645 | v9fs_register_trans(&p9_tcp_trans); |
| 1646 | v9fs_register_trans(&p9_unix_trans); |
| 1647 | v9fs_register_trans(&p9_fd_trans); |
| 1648 | |
Andrew Morton | 3387b80 | 2008-03-28 14:15:57 -0700 | [diff] [blame] | 1649 | return 0; |
Eric Van Hensbergen | a80d923 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 1650 | } |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 1651 | |
| 1652 | void p9_trans_fd_exit(void) |
| 1653 | { |
| 1654 | v9fs_unregister_trans(&p9_tcp_trans); |
| 1655 | v9fs_unregister_trans(&p9_unix_trans); |
| 1656 | v9fs_unregister_trans(&p9_fd_trans); |
| 1657 | } |