Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/mux.c |
| 3 | * |
| 4 | * Protocol Multiplexer |
| 5 | * |
| 6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 7 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to: |
| 21 | * Free Software Foundation |
| 22 | * 51 Franklin Street, Fifth Floor |
| 23 | * Boston, MA 02111-1301 USA |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/config.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/fs.h> |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 31 | #include <linux/poll.h> |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 32 | #include <linux/kthread.h> |
| 33 | #include <linux/idr.h> |
| 34 | |
| 35 | #include "debug.h" |
| 36 | #include "v9fs.h" |
| 37 | #include "9p.h" |
| 38 | #include "transport.h" |
| 39 | #include "conv.h" |
| 40 | #include "mux.h" |
| 41 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 42 | #define ERREQFLUSH 1 |
| 43 | #define SCHED_TIMEOUT 10 |
| 44 | #define MAXPOLLWADDR 2 |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 45 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 46 | enum { |
| 47 | Rworksched = 1, /* read work scheduled or running */ |
| 48 | Rpending = 2, /* can read */ |
| 49 | Wworksched = 4, /* write work scheduled or running */ |
| 50 | Wpending = 8, /* can write */ |
| 51 | }; |
| 52 | |
| 53 | struct v9fs_mux_poll_task; |
| 54 | |
| 55 | struct v9fs_req { |
| 56 | int tag; |
| 57 | struct v9fs_fcall *tcall; |
| 58 | struct v9fs_fcall *rcall; |
| 59 | int err; |
| 60 | v9fs_mux_req_callback cb; |
| 61 | void *cba; |
| 62 | struct list_head req_list; |
| 63 | }; |
| 64 | |
| 65 | struct v9fs_mux_data { |
| 66 | spinlock_t lock; |
| 67 | struct list_head mux_list; |
| 68 | struct v9fs_mux_poll_task *poll_task; |
| 69 | int msize; |
| 70 | unsigned char *extended; |
| 71 | struct v9fs_transport *trans; |
| 72 | struct v9fs_idpool tidpool; |
| 73 | int err; |
| 74 | wait_queue_head_t equeue; |
| 75 | struct list_head req_list; |
| 76 | struct list_head unsent_req_list; |
| 77 | int rpos; |
| 78 | char *rbuf; |
| 79 | int wpos; |
| 80 | int wsize; |
| 81 | char *wbuf; |
| 82 | wait_queue_t poll_wait[MAXPOLLWADDR]; |
| 83 | wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; |
| 84 | poll_table pt; |
| 85 | struct work_struct rq; |
| 86 | struct work_struct wq; |
| 87 | unsigned long wsched; |
| 88 | }; |
| 89 | |
| 90 | struct v9fs_mux_poll_task { |
| 91 | struct task_struct *task; |
| 92 | struct list_head mux_list; |
| 93 | int muxnum; |
| 94 | }; |
| 95 | |
| 96 | struct v9fs_mux_rpc { |
| 97 | struct v9fs_mux_data *m; |
| 98 | struct v9fs_req *req; |
| 99 | int err; |
| 100 | struct v9fs_fcall *rcall; |
| 101 | wait_queue_head_t wqueue; |
| 102 | }; |
| 103 | |
| 104 | static int v9fs_poll_proc(void *); |
| 105 | static void v9fs_read_work(void *); |
| 106 | static void v9fs_write_work(void *); |
| 107 | static void v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address, |
| 108 | poll_table * p); |
| 109 | |
| 110 | static DECLARE_MUTEX(v9fs_mux_task_lock); |
| 111 | static struct workqueue_struct *v9fs_mux_wq; |
| 112 | |
| 113 | static int v9fs_mux_num; |
| 114 | static int v9fs_mux_poll_task_num; |
| 115 | static struct v9fs_mux_poll_task v9fs_mux_poll_tasks[100]; |
| 116 | |
| 117 | void v9fs_mux_global_init(void) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 118 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 119 | int i; |
| 120 | |
| 121 | for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) |
| 122 | v9fs_mux_poll_tasks[i].task = NULL; |
| 123 | |
| 124 | v9fs_mux_wq = create_workqueue("v9fs"); |
| 125 | } |
| 126 | |
| 127 | void v9fs_mux_global_exit(void) |
| 128 | { |
| 129 | destroy_workqueue(v9fs_mux_wq); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /** |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 133 | * v9fs_mux_calc_poll_procs - calculates the number of polling procs |
| 134 | * based on the number of mounted v9fs filesystems. |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 135 | * |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 136 | * The current implementation returns sqrt of the number of mounts. |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 137 | */ |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 138 | inline int v9fs_mux_calc_poll_procs(int muxnum) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 139 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 140 | int n; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 141 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 142 | if (v9fs_mux_poll_task_num) |
| 143 | n = muxnum / v9fs_mux_poll_task_num + |
| 144 | (muxnum % v9fs_mux_poll_task_num ? 1 : 0); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 145 | else |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 146 | n = 1; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 147 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 148 | if (n > ARRAY_SIZE(v9fs_mux_poll_tasks)) |
| 149 | n = ARRAY_SIZE(v9fs_mux_poll_tasks); |
| 150 | |
| 151 | return n; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 154 | static void v9fs_mux_poll_start(struct v9fs_mux_data *m) |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 155 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 156 | int i, n; |
| 157 | struct v9fs_mux_poll_task *vpt, *vptlast; |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 158 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 159 | dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num, |
| 160 | v9fs_mux_poll_task_num); |
| 161 | up(&v9fs_mux_task_lock); |
| 162 | |
| 163 | n = v9fs_mux_calc_poll_procs(v9fs_mux_num + 1); |
| 164 | if (n > v9fs_mux_poll_task_num) { |
| 165 | for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) { |
| 166 | if (v9fs_mux_poll_tasks[i].task == NULL) { |
| 167 | vpt = &v9fs_mux_poll_tasks[i]; |
| 168 | dprintk(DEBUG_MUX, "create proc %p\n", vpt); |
| 169 | vpt->task = kthread_create(v9fs_poll_proc, |
| 170 | vpt, "v9fs-poll"); |
| 171 | INIT_LIST_HEAD(&vpt->mux_list); |
| 172 | vpt->muxnum = 0; |
| 173 | v9fs_mux_poll_task_num++; |
| 174 | wake_up_process(vpt->task); |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) |
| 180 | dprintk(DEBUG_ERROR, "warning: no free poll slots\n"); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 181 | } |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 182 | |
| 183 | n = (v9fs_mux_num + 1) / v9fs_mux_poll_task_num + |
| 184 | ((v9fs_mux_num + 1) % v9fs_mux_poll_task_num ? 1 : 0); |
| 185 | |
| 186 | vptlast = NULL; |
| 187 | for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) { |
| 188 | vpt = &v9fs_mux_poll_tasks[i]; |
| 189 | if (vpt->task != NULL) { |
| 190 | vptlast = vpt; |
| 191 | if (vpt->muxnum < n) { |
| 192 | dprintk(DEBUG_MUX, "put in proc %d\n", i); |
| 193 | list_add(&m->mux_list, &vpt->mux_list); |
| 194 | vpt->muxnum++; |
| 195 | m->poll_task = vpt; |
| 196 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| 197 | init_poll_funcptr(&m->pt, v9fs_pollwait); |
| 198 | break; |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) { |
| 204 | dprintk(DEBUG_MUX, "put in proc %d\n", i); |
| 205 | list_add(&m->mux_list, &vptlast->mux_list); |
| 206 | vptlast->muxnum++; |
| 207 | m->poll_task = vpt; |
| 208 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| 209 | init_poll_funcptr(&m->pt, v9fs_pollwait); |
| 210 | } |
| 211 | |
| 212 | v9fs_mux_num++; |
| 213 | down(&v9fs_mux_task_lock); |
| 214 | } |
| 215 | |
| 216 | static void v9fs_mux_poll_stop(struct v9fs_mux_data *m) |
| 217 | { |
| 218 | int i; |
| 219 | struct v9fs_mux_poll_task *vpt; |
| 220 | |
| 221 | up(&v9fs_mux_task_lock); |
| 222 | vpt = m->poll_task; |
| 223 | list_del(&m->mux_list); |
| 224 | for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| 225 | if (m->poll_waddr[i] != NULL) { |
| 226 | remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); |
| 227 | m->poll_waddr[i] = NULL; |
| 228 | } |
| 229 | } |
| 230 | vpt->muxnum--; |
| 231 | if (!vpt->muxnum) { |
| 232 | dprintk(DEBUG_MUX, "destroy proc %p\n", vpt); |
| 233 | send_sig(SIGKILL, vpt->task, 1); |
| 234 | vpt->task = NULL; |
| 235 | v9fs_mux_poll_task_num--; |
| 236 | } |
| 237 | v9fs_mux_num--; |
| 238 | down(&v9fs_mux_task_lock); |
Eric Van Hensbergen | 322b329 | 2005-09-09 13:04:23 -0700 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | /** |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 242 | * v9fs_mux_init - allocate and initialize the per-session mux data |
| 243 | * Creates the polling task if this is the first session. |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 244 | * |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 245 | * @trans - transport structure |
| 246 | * @msize - maximum message size |
| 247 | * @extended - pointer to the extended flag |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 248 | */ |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 249 | struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize, |
| 250 | unsigned char *extended) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 251 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 252 | int i, n; |
| 253 | struct v9fs_mux_data *m, *mtmp; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 254 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 255 | dprintk(DEBUG_MUX, "transport %p msize %d\n", trans, msize); |
| 256 | m = kmalloc(sizeof(struct v9fs_mux_data) + 2 * msize, GFP_KERNEL); |
| 257 | if (!m) |
| 258 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 259 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 260 | spin_lock_init(&m->lock); |
| 261 | INIT_LIST_HEAD(&m->mux_list); |
| 262 | m->msize = msize; |
| 263 | m->extended = extended; |
| 264 | m->trans = trans; |
| 265 | idr_init(&m->tidpool.pool); |
| 266 | init_MUTEX(&m->tidpool.lock); |
| 267 | m->err = 0; |
| 268 | init_waitqueue_head(&m->equeue); |
| 269 | INIT_LIST_HEAD(&m->req_list); |
| 270 | INIT_LIST_HEAD(&m->unsent_req_list); |
| 271 | m->rpos = 0; |
| 272 | m->rbuf = (char *)m + sizeof(struct v9fs_mux_data); |
| 273 | m->wpos = m->wsize = 0; |
| 274 | m->wbuf = m->rbuf + msize; |
| 275 | INIT_WORK(&m->rq, v9fs_read_work, m); |
| 276 | INIT_WORK(&m->wq, v9fs_write_work, m); |
| 277 | m->wsched = 0; |
| 278 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| 279 | v9fs_mux_poll_start(m); |
| 280 | |
| 281 | n = trans->poll(trans, &m->pt); |
| 282 | if (n & POLLIN) { |
| 283 | dprintk(DEBUG_MUX, "mux %p can read\n", m); |
| 284 | set_bit(Rpending, &m->wsched); |
| 285 | } |
| 286 | |
| 287 | if (n & POLLOUT) { |
| 288 | dprintk(DEBUG_MUX, "mux %p can write\n", m); |
| 289 | set_bit(Wpending, &m->wsched); |
| 290 | } |
| 291 | |
| 292 | for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| 293 | if (IS_ERR(m->poll_waddr[i])) { |
| 294 | v9fs_mux_poll_stop(m); |
| 295 | mtmp = (void *)m->poll_waddr; /* the error code */ |
| 296 | kfree(m); |
| 297 | m = mtmp; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 298 | break; |
| 299 | } |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 300 | } |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 301 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 302 | return m; |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * v9fs_mux_destroy - cancels all pending requests and frees mux resources |
| 307 | */ |
| 308 | void v9fs_mux_destroy(struct v9fs_mux_data *m) |
| 309 | { |
| 310 | dprintk(DEBUG_MUX, "mux %p prev %p next %p\n", m, |
| 311 | m->mux_list.prev, m->mux_list.next); |
| 312 | v9fs_mux_cancel(m, -ECONNRESET); |
| 313 | |
| 314 | if (!list_empty(&m->req_list)) { |
| 315 | /* wait until all processes waiting on this session exit */ |
| 316 | dprintk(DEBUG_MUX, "mux %p waiting for empty request queue\n", |
| 317 | m); |
| 318 | wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000); |
| 319 | dprintk(DEBUG_MUX, "mux %p request queue empty: %d\n", m, |
| 320 | list_empty(&m->req_list)); |
| 321 | } |
| 322 | |
| 323 | v9fs_mux_poll_stop(m); |
| 324 | m->trans = NULL; |
| 325 | |
| 326 | kfree(m); |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * v9fs_pollwait - called by files poll operation to add v9fs-poll task |
| 331 | * to files wait queue |
| 332 | */ |
| 333 | static void |
| 334 | v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address, |
| 335 | poll_table * p) |
| 336 | { |
| 337 | int i; |
| 338 | struct v9fs_mux_data *m; |
| 339 | |
| 340 | m = container_of(p, struct v9fs_mux_data, pt); |
| 341 | for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) |
| 342 | if (m->poll_waddr[i] == NULL) |
| 343 | break; |
| 344 | |
| 345 | if (i >= ARRAY_SIZE(m->poll_waddr)) { |
| 346 | dprintk(DEBUG_ERROR, "not enough wait_address slots\n"); |
| 347 | return; |
| 348 | } |
| 349 | |
| 350 | m->poll_waddr[i] = wait_address; |
| 351 | |
| 352 | if (!wait_address) { |
| 353 | dprintk(DEBUG_ERROR, "no wait_address\n"); |
| 354 | m->poll_waddr[i] = ERR_PTR(-EIO); |
| 355 | return; |
| 356 | } |
| 357 | |
| 358 | init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); |
| 359 | add_wait_queue(wait_address, &m->poll_wait[i]); |
| 360 | } |
| 361 | |
| 362 | /** |
| 363 | * v9fs_poll_mux - polls a mux and schedules read or write works if necessary |
| 364 | */ |
| 365 | static inline void v9fs_poll_mux(struct v9fs_mux_data *m) |
| 366 | { |
| 367 | int n; |
| 368 | |
| 369 | if (m->err < 0) |
| 370 | return; |
| 371 | |
| 372 | n = m->trans->poll(m->trans, NULL); |
| 373 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
| 374 | dprintk(DEBUG_MUX, "error mux %p err %d\n", m, n); |
| 375 | if (n >= 0) |
| 376 | n = -ECONNRESET; |
| 377 | v9fs_mux_cancel(m, n); |
| 378 | } |
| 379 | |
| 380 | if (n & POLLIN) { |
| 381 | set_bit(Rpending, &m->wsched); |
| 382 | dprintk(DEBUG_MUX, "mux %p can read\n", m); |
| 383 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
| 384 | dprintk(DEBUG_MUX, "schedule read work mux %p\n", m); |
| 385 | queue_work(v9fs_mux_wq, &m->rq); |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | if (n & POLLOUT) { |
| 390 | set_bit(Wpending, &m->wsched); |
| 391 | dprintk(DEBUG_MUX, "mux %p can write\n", m); |
| 392 | if ((m->wsize || !list_empty(&m->unsent_req_list)) |
| 393 | && !test_and_set_bit(Wworksched, &m->wsched)) { |
| 394 | dprintk(DEBUG_MUX, "schedule write work mux %p\n", m); |
| 395 | queue_work(v9fs_mux_wq, &m->wq); |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * v9fs_poll_proc - polls all v9fs transports for new events and queues |
| 402 | * the appropriate work to the work queue |
| 403 | */ |
| 404 | static int v9fs_poll_proc(void *a) |
| 405 | { |
| 406 | struct v9fs_mux_data *m, *mtmp; |
| 407 | struct v9fs_mux_poll_task *vpt; |
| 408 | |
| 409 | vpt = a; |
| 410 | dprintk(DEBUG_MUX, "start %p %p\n", current, vpt); |
| 411 | allow_signal(SIGKILL); |
| 412 | while (!kthread_should_stop()) { |
| 413 | set_current_state(TASK_INTERRUPTIBLE); |
| 414 | if (signal_pending(current)) |
| 415 | break; |
| 416 | |
| 417 | list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { |
| 418 | v9fs_poll_mux(m); |
| 419 | } |
| 420 | |
| 421 | dprintk(DEBUG_MUX, "sleeping...\n"); |
| 422 | schedule_timeout(SCHED_TIMEOUT * HZ); |
| 423 | } |
| 424 | |
| 425 | __set_current_state(TASK_RUNNING); |
| 426 | dprintk(DEBUG_MUX, "finish\n"); |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static inline int v9fs_write_req(struct v9fs_mux_data *m, struct v9fs_req *req) |
| 431 | { |
| 432 | int n; |
| 433 | |
| 434 | list_move_tail(&req->req_list, &m->req_list); |
| 435 | n = v9fs_serialize_fcall(req->tcall, m->wbuf, m->msize, *m->extended); |
| 436 | if (n < 0) { |
| 437 | req->err = n; |
| 438 | list_del(&req->req_list); |
| 439 | if (req->cb) { |
| 440 | spin_unlock(&m->lock); |
| 441 | (*req->cb) (req->cba, req->tcall, req->rcall, req->err); |
| 442 | req->cb = NULL; |
| 443 | spin_lock(&m->lock); |
| 444 | } else |
| 445 | kfree(req->rcall); |
| 446 | |
| 447 | kfree(req); |
| 448 | } |
| 449 | |
| 450 | return n; |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * v9fs_write_work - called when a transport can send some data |
| 455 | */ |
| 456 | static void v9fs_write_work(void *a) |
| 457 | { |
| 458 | int n, err; |
| 459 | struct v9fs_mux_data *m; |
| 460 | struct v9fs_req *req, *rtmp; |
| 461 | |
| 462 | m = a; |
| 463 | |
| 464 | if (m->err < 0) { |
| 465 | clear_bit(Wworksched, &m->wsched); |
| 466 | return; |
| 467 | } |
| 468 | |
| 469 | if (!m->wsize) { |
| 470 | if (list_empty(&m->unsent_req_list)) { |
| 471 | clear_bit(Wworksched, &m->wsched); |
| 472 | return; |
| 473 | } |
| 474 | |
| 475 | err = 0; |
| 476 | spin_lock(&m->lock); |
| 477 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, |
| 478 | req_list) { |
| 479 | err = v9fs_write_req(m, req); |
| 480 | if (err > 0) |
| 481 | break; |
| 482 | } |
| 483 | |
| 484 | m->wsize = err; |
| 485 | m->wpos = 0; |
| 486 | spin_unlock(&m->lock); |
| 487 | } |
| 488 | |
| 489 | dprintk(DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, m->wsize); |
| 490 | clear_bit(Wpending, &m->wsched); |
| 491 | err = m->trans->write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); |
| 492 | dprintk(DEBUG_MUX, "mux %p sent %d bytes\n", m, err); |
| 493 | if (err == -EAGAIN) { |
| 494 | clear_bit(Wworksched, &m->wsched); |
| 495 | return; |
| 496 | } |
| 497 | |
| 498 | if (err <= 0) |
| 499 | goto error; |
| 500 | |
| 501 | m->wpos += err; |
| 502 | if (m->wpos == m->wsize) |
| 503 | m->wpos = m->wsize = 0; |
| 504 | |
| 505 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { |
| 506 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 507 | n = POLLOUT; |
| 508 | else |
| 509 | n = m->trans->poll(m->trans, NULL); |
| 510 | |
| 511 | if (n & POLLOUT) { |
| 512 | dprintk(DEBUG_MUX, "schedule write work mux %p\n", m); |
| 513 | queue_work(v9fs_mux_wq, &m->wq); |
| 514 | } else |
| 515 | clear_bit(Wworksched, &m->wsched); |
| 516 | } else |
| 517 | clear_bit(Wworksched, &m->wsched); |
| 518 | |
| 519 | return; |
| 520 | |
| 521 | error: |
| 522 | v9fs_mux_cancel(m, err); |
| 523 | clear_bit(Wworksched, &m->wsched); |
| 524 | } |
| 525 | |
| 526 | static void process_request(struct v9fs_mux_data *m, struct v9fs_req *req) |
| 527 | { |
| 528 | int ecode, tag; |
| 529 | char *ename; |
| 530 | |
| 531 | tag = req->tag; |
| 532 | if (req->rcall->id == RERROR && !req->err) { |
| 533 | ecode = req->rcall->params.rerror.errno; |
| 534 | ename = req->rcall->params.rerror.error; |
| 535 | |
| 536 | dprintk(DEBUG_MUX, "Rerror %s\n", ename); |
| 537 | |
| 538 | if (*m->extended) |
| 539 | req->err = -ecode; |
| 540 | |
| 541 | if (!req->err) { |
| 542 | req->err = v9fs_errstr2errno(ename); |
| 543 | |
| 544 | if (!req->err) { /* string match failed */ |
| 545 | dprintk(DEBUG_ERROR, "unknown error: %s\n", |
| 546 | ename); |
| 547 | } |
| 548 | |
| 549 | if (!req->err) |
| 550 | req->err = -ESERVERFAULT; |
| 551 | } |
| 552 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { |
| 553 | dprintk(DEBUG_ERROR, "fcall mismatch: expected %d, got %d\n", |
| 554 | req->tcall->id + 1, req->rcall->id); |
| 555 | if (!req->err) |
| 556 | req->err = -EIO; |
| 557 | } |
| 558 | |
| 559 | if (req->cb && req->err != ERREQFLUSH) { |
| 560 | dprintk(DEBUG_MUX, "calling callback tcall %p rcall %p\n", |
| 561 | req->tcall, req->rcall); |
| 562 | |
| 563 | (*req->cb) (req->cba, req->tcall, req->rcall, req->err); |
| 564 | req->cb = NULL; |
| 565 | } else |
| 566 | kfree(req->rcall); |
| 567 | |
| 568 | if (tag != V9FS_NOTAG) |
| 569 | v9fs_put_idpool(tag, &m->tidpool); |
| 570 | |
| 571 | wake_up(&m->equeue); |
| 572 | kfree(req); |
| 573 | } |
| 574 | |
| 575 | /** |
| 576 | * v9fs_read_work - called when there is some data to be read from a transport |
| 577 | */ |
| 578 | static void v9fs_read_work(void *a) |
| 579 | { |
| 580 | int n, err, rcallen; |
| 581 | struct v9fs_mux_data *m; |
| 582 | struct v9fs_req *req, *rptr, *rreq; |
| 583 | struct v9fs_fcall *rcall; |
| 584 | |
| 585 | m = a; |
| 586 | |
| 587 | if (m->err < 0) |
| 588 | return; |
| 589 | |
| 590 | rcall = NULL; |
| 591 | dprintk(DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); |
| 592 | clear_bit(Rpending, &m->wsched); |
| 593 | err = m->trans->read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); |
| 594 | dprintk(DEBUG_MUX, "mux %p got %d bytes\n", m, err); |
| 595 | if (err == -EAGAIN) { |
| 596 | clear_bit(Rworksched, &m->wsched); |
| 597 | return; |
| 598 | } |
| 599 | |
| 600 | if (err <= 0) |
| 601 | goto error; |
| 602 | |
| 603 | m->rpos += err; |
| 604 | while (m->rpos > 4) { |
| 605 | n = le32_to_cpu(*(__le32 *) m->rbuf); |
| 606 | if (n >= m->msize) { |
| 607 | dprintk(DEBUG_ERROR, |
| 608 | "requested packet size too big: %d\n", n); |
| 609 | err = -EIO; |
| 610 | goto error; |
| 611 | } |
| 612 | |
| 613 | if (m->rpos < n) |
| 614 | break; |
| 615 | |
| 616 | rcallen = n + V9FS_FCALLHDRSZ; |
| 617 | rcall = kmalloc(rcallen, GFP_KERNEL); |
| 618 | if (!rcall) { |
| 619 | err = -ENOMEM; |
| 620 | goto error; |
| 621 | } |
| 622 | |
| 623 | dump_data(m->rbuf, n); |
| 624 | err = v9fs_deserialize_fcall(m->rbuf, n, rcall, rcallen, |
| 625 | *m->extended); |
Eric Van Hensbergen | cb2e87a | 2005-09-09 13:04:28 -0700 | [diff] [blame] | 626 | if (err < 0) { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 627 | kfree(rcall); |
| 628 | goto error; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 631 | dprintk(DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, rcall->id, |
| 632 | rcall->tag); |
| 633 | |
| 634 | req = NULL; |
| 635 | spin_lock(&m->lock); |
| 636 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { |
| 637 | if (rreq->tag == rcall->tag) { |
| 638 | req = rreq; |
| 639 | req->rcall = rcall; |
| 640 | list_del(&req->req_list); |
| 641 | spin_unlock(&m->lock); |
| 642 | process_request(m, req); |
| 643 | break; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 647 | if (!req) { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 648 | spin_unlock(&m->lock); |
| 649 | if (err >= 0 && rcall->id != RFLUSH) |
Eric Van Hensbergen | cb2e87a | 2005-09-09 13:04:28 -0700 | [diff] [blame] | 650 | dprintk(DEBUG_ERROR, |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 651 | "unexpected response mux %p id %d tag %d\n", |
| 652 | m, rcall->id, rcall->tag); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 653 | kfree(rcall); |
| 654 | } |
| 655 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 656 | if (m->rpos > n) |
| 657 | memmove(m->rbuf, m->rbuf + n, m->rpos - n); |
| 658 | m->rpos -= n; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 661 | if (!list_empty(&m->req_list)) { |
| 662 | if (test_and_clear_bit(Rpending, &m->wsched)) |
| 663 | n = POLLIN; |
| 664 | else |
| 665 | n = m->trans->poll(m->trans, NULL); |
Eric Van Hensbergen | cb2e87a | 2005-09-09 13:04:28 -0700 | [diff] [blame] | 666 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 667 | if (n & POLLIN) { |
| 668 | dprintk(DEBUG_MUX, "schedule read work mux %p\n", m); |
| 669 | queue_work(v9fs_mux_wq, &m->rq); |
| 670 | } else |
| 671 | clear_bit(Rworksched, &m->wsched); |
| 672 | } else |
| 673 | clear_bit(Rworksched, &m->wsched); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 674 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 675 | return; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 676 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 677 | error: |
| 678 | v9fs_mux_cancel(m, err); |
| 679 | clear_bit(Rworksched, &m->wsched); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /** |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 683 | * v9fs_send_request - send 9P request |
| 684 | * The function can sleep until the request is scheduled for sending. |
| 685 | * The function can be interrupted. Return from the function is not |
| 686 | * a guarantee that the request is sent succesfully. Can return errors |
| 687 | * that can be retrieved by PTR_ERR macros. |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 688 | * |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 689 | * @m: mux data |
| 690 | * @tc: request to be sent |
| 691 | * @cb: callback function to call when response is received |
| 692 | * @cba: parameter to pass to the callback function |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 693 | */ |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 694 | static struct v9fs_req *v9fs_send_request(struct v9fs_mux_data *m, |
| 695 | struct v9fs_fcall *tc, |
| 696 | v9fs_mux_req_callback cb, void *cba) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 697 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 698 | int n; |
| 699 | struct v9fs_req *req; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 700 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 701 | dprintk(DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, |
| 702 | tc, tc->id); |
| 703 | if (m->err < 0) |
| 704 | return ERR_PTR(m->err); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 705 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 706 | req = kmalloc(sizeof(struct v9fs_req), GFP_KERNEL); |
| 707 | if (!req) |
| 708 | return ERR_PTR(-ENOMEM); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 709 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 710 | if (tc->id == TVERSION) |
| 711 | n = V9FS_NOTAG; |
| 712 | else |
| 713 | n = v9fs_get_idpool(&m->tidpool); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 714 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 715 | if (n < 0) |
| 716 | return ERR_PTR(-ENOMEM); |
| 717 | |
| 718 | tc->tag = n; |
| 719 | req->tag = n; |
| 720 | req->tcall = tc; |
| 721 | req->rcall = NULL; |
| 722 | req->err = 0; |
| 723 | req->cb = cb; |
| 724 | req->cba = cba; |
| 725 | |
| 726 | spin_lock(&m->lock); |
| 727 | list_add_tail(&req->req_list, &m->unsent_req_list); |
| 728 | spin_unlock(&m->lock); |
| 729 | |
| 730 | if (test_and_clear_bit(Wpending, &m->wsched)) |
| 731 | n = POLLOUT; |
| 732 | else |
| 733 | n = m->trans->poll(m->trans, NULL); |
| 734 | |
| 735 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
| 736 | queue_work(v9fs_mux_wq, &m->wq); |
| 737 | |
| 738 | return req; |
| 739 | } |
| 740 | |
| 741 | static inline void |
| 742 | v9fs_mux_flush_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, |
| 743 | int err) |
| 744 | { |
| 745 | v9fs_mux_req_callback cb; |
| 746 | int tag; |
| 747 | struct v9fs_mux_data *m; |
| 748 | struct v9fs_req *req, *rptr; |
| 749 | |
| 750 | m = a; |
| 751 | dprintk(DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, tc, |
| 752 | rc, err, tc->params.tflush.oldtag); |
| 753 | |
| 754 | spin_lock(&m->lock); |
| 755 | cb = NULL; |
| 756 | tag = tc->params.tflush.oldtag; |
| 757 | list_for_each_entry_safe(req, rptr, &m->req_list, req_list) { |
| 758 | if (req->tag == tag) { |
| 759 | list_del(&req->req_list); |
| 760 | if (req->cb) { |
| 761 | cb = req->cb; |
| 762 | req->cb = NULL; |
| 763 | spin_unlock(&m->lock); |
| 764 | (*cb) (req->cba, req->tcall, req->rcall, |
| 765 | req->err); |
| 766 | } |
| 767 | kfree(req); |
| 768 | wake_up(&m->equeue); |
| 769 | break; |
| 770 | } |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 771 | } |
| 772 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 773 | if (!cb) |
| 774 | spin_unlock(&m->lock); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 775 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 776 | if (v9fs_check_idpool(tag, &m->tidpool)) |
| 777 | v9fs_put_idpool(tag, &m->tidpool); |
| 778 | |
| 779 | kfree(tc); |
| 780 | kfree(rc); |
| 781 | } |
| 782 | |
| 783 | static void |
| 784 | v9fs_mux_flush_request(struct v9fs_mux_data *m, struct v9fs_req *req) |
| 785 | { |
| 786 | struct v9fs_fcall *fc; |
| 787 | |
| 788 | dprintk(DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); |
| 789 | |
| 790 | fc = kmalloc(sizeof(struct v9fs_fcall), GFP_KERNEL); |
| 791 | fc->id = TFLUSH; |
| 792 | fc->params.tflush.oldtag = req->tag; |
| 793 | |
| 794 | v9fs_send_request(m, fc, v9fs_mux_flush_cb, m); |
| 795 | } |
| 796 | |
| 797 | static void |
| 798 | v9fs_mux_rpc_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, int err) |
| 799 | { |
| 800 | struct v9fs_mux_rpc *r; |
| 801 | |
| 802 | if (err == ERREQFLUSH) { |
| 803 | dprintk(DEBUG_MUX, "err req flush\n"); |
| 804 | return; |
| 805 | } |
| 806 | |
| 807 | r = a; |
| 808 | dprintk(DEBUG_MUX, "mux %p req %p tc %p rc %p err %d\n", r->m, r->req, |
| 809 | tc, rc, err); |
| 810 | r->rcall = rc; |
| 811 | r->err = err; |
| 812 | wake_up(&r->wqueue); |
| 813 | } |
| 814 | |
| 815 | /** |
| 816 | * v9fs_mux_rpc - sends 9P request and waits until a response is available. |
| 817 | * The function can be interrupted. |
| 818 | * @m: mux data |
| 819 | * @tc: request to be sent |
| 820 | * @rc: pointer where a pointer to the response is stored |
| 821 | */ |
| 822 | int |
| 823 | v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc, |
| 824 | struct v9fs_fcall **rc) |
| 825 | { |
| 826 | int err; |
| 827 | unsigned long flags; |
| 828 | struct v9fs_req *req; |
| 829 | struct v9fs_mux_rpc r; |
| 830 | |
| 831 | r.err = 0; |
| 832 | r.rcall = NULL; |
| 833 | r.m = m; |
| 834 | init_waitqueue_head(&r.wqueue); |
| 835 | |
| 836 | if (rc) |
| 837 | *rc = NULL; |
| 838 | |
| 839 | req = v9fs_send_request(m, tc, v9fs_mux_rpc_cb, &r); |
| 840 | if (IS_ERR(req)) { |
| 841 | err = PTR_ERR(req); |
| 842 | dprintk(DEBUG_MUX, "error %d\n", err); |
| 843 | return PTR_ERR(req); |
| 844 | } |
| 845 | |
| 846 | r.req = req; |
| 847 | dprintk(DEBUG_MUX, "mux %p tc %p tag %d rpc %p req %p\n", m, tc, |
| 848 | req->tag, &r, req); |
| 849 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); |
| 850 | if (r.err < 0) |
| 851 | err = r.err; |
| 852 | |
| 853 | if (err == -ERESTARTSYS && m->trans->status == Connected && m->err == 0) { |
| 854 | spin_lock(&m->lock); |
| 855 | req->tcall = NULL; |
| 856 | req->err = ERREQFLUSH; |
| 857 | spin_unlock(&m->lock); |
| 858 | |
| 859 | clear_thread_flag(TIF_SIGPENDING); |
| 860 | v9fs_mux_flush_request(m, req); |
| 861 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 862 | recalc_sigpending(); |
| 863 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 864 | } |
| 865 | |
| 866 | if (!err) { |
| 867 | if (r.rcall) |
| 868 | dprintk(DEBUG_MUX, "got response id %d tag %d\n", |
| 869 | r.rcall->id, r.rcall->tag); |
| 870 | |
| 871 | if (rc) |
| 872 | *rc = r.rcall; |
| 873 | else |
| 874 | kfree(r.rcall); |
| 875 | } else { |
| 876 | kfree(r.rcall); |
| 877 | dprintk(DEBUG_MUX, "got error %d\n", err); |
| 878 | if (err > 0) |
| 879 | err = -EIO; |
| 880 | } |
| 881 | |
| 882 | return err; |
| 883 | } |
| 884 | |
| 885 | /** |
| 886 | * v9fs_mux_rpcnb - sends 9P request without waiting for response. |
| 887 | * @m: mux data |
| 888 | * @tc: request to be sent |
| 889 | * @cb: callback function to be called when response arrives |
| 890 | * @cba: value to pass to the callback function |
| 891 | */ |
| 892 | int v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc, |
| 893 | v9fs_mux_req_callback cb, void *a) |
| 894 | { |
| 895 | int err; |
| 896 | struct v9fs_req *req; |
| 897 | |
| 898 | req = v9fs_send_request(m, tc, cb, a); |
| 899 | if (IS_ERR(req)) { |
| 900 | err = PTR_ERR(req); |
| 901 | dprintk(DEBUG_MUX, "error %d\n", err); |
| 902 | return PTR_ERR(req); |
| 903 | } |
| 904 | |
| 905 | dprintk(DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 906 | return 0; |
| 907 | } |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame^] | 908 | |
| 909 | /** |
| 910 | * v9fs_mux_cancel - cancel all pending requests with error |
| 911 | * @m: mux data |
| 912 | * @err: error code |
| 913 | */ |
| 914 | void v9fs_mux_cancel(struct v9fs_mux_data *m, int err) |
| 915 | { |
| 916 | struct v9fs_req *req, *rtmp; |
| 917 | LIST_HEAD(cancel_list); |
| 918 | |
| 919 | dprintk(DEBUG_MUX, "mux %p err %d\n", m, err); |
| 920 | m->err = err; |
| 921 | spin_lock(&m->lock); |
| 922 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
| 923 | list_move(&req->req_list, &cancel_list); |
| 924 | } |
| 925 | spin_unlock(&m->lock); |
| 926 | |
| 927 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
| 928 | list_del(&req->req_list); |
| 929 | if (!req->err) |
| 930 | req->err = err; |
| 931 | |
| 932 | if (req->cb) |
| 933 | (*req->cb) (req->cba, req->tcall, req->rcall, req->err); |
| 934 | else |
| 935 | kfree(req->rcall); |
| 936 | |
| 937 | kfree(req); |
| 938 | } |
| 939 | |
| 940 | wake_up(&m->equeue); |
| 941 | } |