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Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001/*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06006 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05007 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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 version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
Joe Perches5d385152011-11-28 10:40:46 -080026#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050028#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060031#include <linux/poll.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050032#include <linux/idr.h>
33#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050035#include <linux/sched.h>
36#include <linux/uaccess.h>
Al Viro4f3b35c2015-04-01 19:57:53 -040037#include <linux/uio.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050038#include <net/9p/9p.h>
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050039#include <linux/parser.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050040#include <net/9p/client.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050041#include <net/9p/transport.h>
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -050042#include "protocol.h"
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050043
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +053044#define CREATE_TRACE_POINTS
45#include <trace/events/9p.h>
46
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060047/*
48 * Client Option Parsing (code inspired by NFS code)
49 * - a little lazy - parse all client options
50 */
51
52enum {
53 Opt_msize,
54 Opt_trans,
55 Opt_legacy,
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000056 Opt_version,
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060057 Opt_err,
58};
59
Steven Whitehousea447c092008-10-13 10:46:57 +010060static const match_table_t tokens = {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060061 {Opt_msize, "msize=%u"},
62 {Opt_legacy, "noextend"},
63 {Opt_trans, "trans=%s"},
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000064 {Opt_version, "version=%s"},
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060065 {Opt_err, NULL},
66};
67
Sripathi Kodi342fee12010-03-05 18:50:14 +000068inline int p9_is_proto_dotl(struct p9_client *clnt)
69{
Eric Dumazeta02cec22010-09-22 20:43:57 +000070 return clnt->proto_version == p9_proto_2000L;
Sripathi Kodi342fee12010-03-05 18:50:14 +000071}
72EXPORT_SYMBOL(p9_is_proto_dotl);
73
74inline int p9_is_proto_dotu(struct p9_client *clnt)
75{
Eric Dumazeta02cec22010-09-22 20:43:57 +000076 return clnt->proto_version == p9_proto_2000u;
Sripathi Kodi342fee12010-03-05 18:50:14 +000077}
78EXPORT_SYMBOL(p9_is_proto_dotu);
79
Simon Derr43def352012-08-10 15:52:06 +020080/*
81 * Some error codes are taken directly from the server replies,
82 * make sure they are valid.
83 */
84static int safe_errno(int err)
85{
86 if ((err > 0) || (err < -MAX_ERRNO)) {
87 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
88 return -EPROTO;
89 }
90 return err;
91}
92
93
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000094/* Interpret mount option for protocol version */
Prem Karat4d630552011-05-06 18:35:32 +053095static int get_protocol_version(char *s)
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000096{
Dan Carpenter3dc9fef2010-04-05 14:37:28 -050097 int version = -EINVAL;
98
Prem Karat4d630552011-05-06 18:35:32 +053099 if (!strcmp(s, "9p2000")) {
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000100 version = p9_proto_legacy;
Joe Perches5d385152011-11-28 10:40:46 -0800101 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
Prem Karat4d630552011-05-06 18:35:32 +0530102 } else if (!strcmp(s, "9p2000.u")) {
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000103 version = p9_proto_2000u;
Joe Perches5d385152011-11-28 10:40:46 -0800104 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
Prem Karat4d630552011-05-06 18:35:32 +0530105 } else if (!strcmp(s, "9p2000.L")) {
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000106 version = p9_proto_2000L;
Joe Perches5d385152011-11-28 10:40:46 -0800107 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
Prem Karat4d630552011-05-06 18:35:32 +0530108 } else
Joe Perches5d385152011-11-28 10:40:46 -0800109 pr_info("Unknown protocol version %s\n", s);
Prem Karat4d630552011-05-06 18:35:32 +0530110
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000111 return version;
112}
113
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600114/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600115 * parse_options - parse mount options into client structure
116 * @opts: options string passed from mount
117 * @clnt: existing v9fs client information
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600118 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600119 * Return 0 upon success, -ERRNO upon failure
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600120 */
121
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600122static int parse_opts(char *opts, struct p9_client *clnt)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600123{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600124 char *options, *tmp_options;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600125 char *p;
126 substring_t args[MAX_OPT_ARGS];
127 int option;
Prem Karat4d630552011-05-06 18:35:32 +0530128 char *s;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600129 int ret = 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600130
Aneesh Kumar K.V095e7992013-05-20 12:20:54 +0530131 clnt->proto_version = p9_proto_2000L;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600132 clnt->msize = 8192;
133
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600134 if (!opts)
135 return 0;
136
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600137 tmp_options = kstrdup(opts, GFP_KERNEL);
138 if (!tmp_options) {
Joe Perches5d385152011-11-28 10:40:46 -0800139 p9_debug(P9_DEBUG_ERROR,
140 "failed to allocate copy of option string\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600141 return -ENOMEM;
142 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600143 options = tmp_options;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600144
145 while ((p = strsep(&options, ",")) != NULL) {
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530146 int token, r;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600147 if (!*p)
148 continue;
149 token = match_token(p, tokens, args);
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530150 switch (token) {
151 case Opt_msize:
152 r = match_int(&args[0], &option);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600153 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800154 p9_debug(P9_DEBUG_ERROR,
155 "integer field, but no integer?\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600156 ret = r;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600157 continue;
158 }
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600159 clnt->msize = option;
160 break;
161 case Opt_trans:
Prem Karat4d630552011-05-06 18:35:32 +0530162 s = match_strdup(&args[0]);
163 if (!s) {
164 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800165 p9_debug(P9_DEBUG_ERROR,
166 "problem allocating copy of trans arg\n");
Prem Karat4d630552011-05-06 18:35:32 +0530167 goto free_and_return;
168 }
169 clnt->trans_mod = v9fs_get_trans_by_name(s);
170 if (clnt->trans_mod == NULL) {
Joe Perches5d385152011-11-28 10:40:46 -0800171 pr_info("Could not find request transport: %s\n",
172 s);
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600173 ret = -EINVAL;
Prem Karat4d630552011-05-06 18:35:32 +0530174 kfree(s);
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600175 goto free_and_return;
176 }
Prem Karat4d630552011-05-06 18:35:32 +0530177 kfree(s);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600178 break;
179 case Opt_legacy:
Sripathi Kodi342fee12010-03-05 18:50:14 +0000180 clnt->proto_version = p9_proto_legacy;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600181 break;
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000182 case Opt_version:
Prem Karat4d630552011-05-06 18:35:32 +0530183 s = match_strdup(&args[0]);
184 if (!s) {
185 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800186 p9_debug(P9_DEBUG_ERROR,
187 "problem allocating copy of version arg\n");
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000188 goto free_and_return;
Prem Karat4d630552011-05-06 18:35:32 +0530189 }
190 ret = get_protocol_version(s);
191 if (ret == -EINVAL) {
192 kfree(s);
193 goto free_and_return;
194 }
195 kfree(s);
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000196 clnt->proto_version = ret;
197 break;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600198 default:
199 continue;
200 }
201 }
Tejun Heo72029fe2008-09-24 16:22:23 -0500202
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600203free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600204 kfree(tmp_options);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600205 return ret;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600206}
207
Rashika05a782d2014-02-09 19:57:33 +0530208static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
Simon Derr53873202013-06-21 15:32:36 +0200209{
210 struct p9_fcall *fc;
211 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
212 if (!fc)
213 return NULL;
214 fc->capacity = alloc_msize;
215 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
216 return fc;
217}
218
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500219/**
220 * p9_tag_alloc - lookup/allocate a request by tag
221 * @c: client session to lookup tag within
222 * @tag: numeric id for transaction
223 *
224 * this is a simple array lookup, but will grow the
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300225 * request_slots as necessary to accommodate transaction
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500226 * ids which did not previously have a slot.
227 *
228 * this code relies on the client spinlock to manage locks, its
229 * possible we should switch to something else, but I'd rather
230 * stick with something low-overhead for the common case.
231 *
232 */
233
Dan Carpenteref6b0802011-08-26 19:57:40 +0300234static struct p9_req_t *
235p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500236{
237 unsigned long flags;
238 int row, col;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500239 struct p9_req_t *req;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530240 int alloc_msize = min(c->msize, max_size);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500241
242 /* This looks up the original request by tag so we know which
243 * buffer to read the data into */
244 tag++;
245
246 if (tag >= c->max_tag) {
247 spin_lock_irqsave(&c->lock, flags);
248 /* check again since original check was outside of lock */
249 while (tag >= c->max_tag) {
250 row = (tag / P9_ROW_MAXTAG);
251 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
252 sizeof(struct p9_req_t), GFP_ATOMIC);
253
254 if (!c->reqs[row]) {
Joe Perches5d385152011-11-28 10:40:46 -0800255 pr_err("Couldn't grow tag array\n");
Eric Van Hensbergene45c5402008-10-22 18:54:47 -0500256 spin_unlock_irqrestore(&c->lock, flags);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500257 return ERR_PTR(-ENOMEM);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500258 }
259 for (col = 0; col < P9_ROW_MAXTAG; col++) {
260 c->reqs[row][col].status = REQ_STATUS_IDLE;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500261 c->reqs[row][col].tc = NULL;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500262 }
263 c->max_tag += P9_ROW_MAXTAG;
264 }
265 spin_unlock_irqrestore(&c->lock, flags);
266 }
267 row = tag / P9_ROW_MAXTAG;
268 col = tag % P9_ROW_MAXTAG;
269
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500270 req = &c->reqs[row][col];
Simon Derr53873202013-06-21 15:32:36 +0200271 if (!req->wq) {
Aneesh Kumar K.Veeff66e2011-03-08 16:39:47 +0530272 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
Simon Derrea071aa2013-06-21 15:32:34 +0200273 if (!req->wq)
274 goto grow_failed;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500275 init_waitqueue_head(req->wq);
Simon Derrea071aa2013-06-21 15:32:34 +0200276 }
Simon Derrea071aa2013-06-21 15:32:34 +0200277
Simon Derr53873202013-06-21 15:32:36 +0200278 if (!req->tc)
279 req->tc = p9_fcall_alloc(alloc_msize);
280 if (!req->rc)
281 req->rc = p9_fcall_alloc(alloc_msize);
282 if (!req->tc || !req->rc)
283 goto grow_failed;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500284
285 p9pdu_reset(req->tc);
286 p9pdu_reset(req->rc);
287
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500288 req->tc->tag = tag-1;
289 req->status = REQ_STATUS_ALLOC;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500290
Simon Derrea071aa2013-06-21 15:32:34 +0200291 return req;
292
293grow_failed:
294 pr_err("Couldn't grow tag array\n");
295 kfree(req->tc);
296 kfree(req->rc);
297 kfree(req->wq);
298 req->tc = req->rc = NULL;
299 req->wq = NULL;
300 return ERR_PTR(-ENOMEM);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500301}
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500302
303/**
304 * p9_tag_lookup - lookup a request by tag
305 * @c: client session to lookup tag within
306 * @tag: numeric id for transaction
307 *
308 */
309
310struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
311{
312 int row, col;
313
314 /* This looks up the original request by tag so we know which
315 * buffer to read the data into */
316 tag++;
317
Eric Van Hensbergenb85f7d922011-07-13 19:12:18 -0500318 if(tag >= c->max_tag)
319 return NULL;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500320
321 row = tag / P9_ROW_MAXTAG;
322 col = tag % P9_ROW_MAXTAG;
323
324 return &c->reqs[row][col];
325}
326EXPORT_SYMBOL(p9_tag_lookup);
327
328/**
329 * p9_tag_init - setup tags structure and contents
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600330 * @c: v9fs client struct
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500331 *
332 * This initializes the tags structure for each client instance.
333 *
334 */
335
336static int p9_tag_init(struct p9_client *c)
337{
338 int err = 0;
339
340 c->tagpool = p9_idpool_create();
341 if (IS_ERR(c->tagpool)) {
342 err = PTR_ERR(c->tagpool);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500343 goto error;
344 }
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +0000345 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
346 if (err < 0) {
347 p9_idpool_destroy(c->tagpool);
348 goto error;
349 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500350 c->max_tag = 0;
351error:
352 return err;
353}
354
355/**
356 * p9_tag_cleanup - cleans up tags structure and reclaims resources
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600357 * @c: v9fs client struct
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500358 *
359 * This frees resources associated with the tags structure
360 *
361 */
362static void p9_tag_cleanup(struct p9_client *c)
363{
364 int row, col;
365
366 /* check to insure all requests are idle */
367 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
368 for (col = 0; col < P9_ROW_MAXTAG; col++) {
369 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
Joe Perches5d385152011-11-28 10:40:46 -0800370 p9_debug(P9_DEBUG_MUX,
371 "Attempting to cleanup non-free tag %d,%d\n",
372 row, col);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500373 /* TODO: delay execution of cleanup */
374 return;
375 }
376 }
377 }
378
Latchesar Ionkov62b2be52010-08-24 18:13:59 +0000379 if (c->tagpool) {
380 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500381 p9_idpool_destroy(c->tagpool);
Latchesar Ionkov62b2be52010-08-24 18:13:59 +0000382 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500383
384 /* free requests associated with tags */
385 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500386 for (col = 0; col < P9_ROW_MAXTAG; col++) {
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500387 kfree(c->reqs[row][col].wq);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500388 kfree(c->reqs[row][col].tc);
389 kfree(c->reqs[row][col].rc);
390 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500391 kfree(c->reqs[row]);
392 }
393 c->max_tag = 0;
394}
395
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500396/**
397 * p9_free_req - free a request and clean-up as necessary
398 * c: client state
399 * r: request to release
400 *
401 */
402
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500403static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500404{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500405 int tag = r->tc->tag;
Joe Perches5d385152011-11-28 10:40:46 -0800406 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500407
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500408 r->status = REQ_STATUS_IDLE;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500409 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
410 p9_idpool_put(tag, c->tagpool);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500411}
412
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500413/**
414 * p9_client_cb - call back from transport to client
415 * c: client state
416 * req: request received
417 *
418 */
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100419void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500420{
Joe Perches5d385152011-11-28 10:40:46 -0800421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100422
423 /*
424 * This barrier is needed to make sure any change made to req before
425 * the other thread wakes up will indeed be seen by the waiting side.
426 */
427 smp_wmb();
428 req->status = status;
429
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500430 wake_up(req->wq);
Joe Perches5d385152011-11-28 10:40:46 -0800431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500432}
433EXPORT_SYMBOL(p9_client_cb);
434
435/**
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500436 * p9_parse_header - parse header arguments out of a packet
437 * @pdu: packet to parse
438 * @size: size of packet
439 * @type: type of request
440 * @tag: tag of packet
441 * @rewind: set if we need to rewind offset afterwards
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500442 */
443
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500444int
445p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
446 int rewind)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500447{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500448 int8_t r_type;
449 int16_t r_tag;
450 int32_t r_size;
451 int offset = pdu->offset;
452 int err;
453
454 pdu->offset = 0;
455 if (pdu->size == 0)
456 pdu->size = 7;
457
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 if (err)
460 goto rewind_and_exit;
461
462 pdu->size = r_size;
463 pdu->id = r_type;
464 pdu->tag = r_tag;
465
Joe Perches5d385152011-11-28 10:40:46 -0800466 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
467 pdu->size, pdu->id, pdu->tag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500468
469 if (type)
470 *type = r_type;
471 if (tag)
472 *tag = r_tag;
473 if (size)
474 *size = r_size;
475
476
477rewind_and_exit:
478 if (rewind)
479 pdu->offset = offset;
480 return err;
481}
482EXPORT_SYMBOL(p9_parse_header);
483
484/**
485 * p9_check_errors - check 9p packet for error return and process it
486 * @c: current client instance
487 * @req: request to parse and check for error conditions
488 *
489 * returns error code if one is discovered, otherwise returns 0
490 *
491 * this will have to be more complicated if we have multiple
492 * error packet types
493 */
494
495static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
496{
497 int8_t type;
498 int err;
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800499 int ecode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500500
501 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530502 /*
503 * dump the response from server
504 * This should be after check errors which poplulate pdu_fcall.
505 */
506 trace_9p_protocol_dump(c, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500507 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800508 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500509 return err;
510 }
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800511 if (type != P9_RERROR && type != P9_RLERROR)
512 return 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500513
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800514 if (!p9_is_proto_dotl(c)) {
515 char *ename;
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800516 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530517 &ename, &ecode);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800518 if (err)
519 goto out_err;
520
521 if (p9_is_proto_dotu(c))
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500522 err = -ecode;
523
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800524 if (!err || !IS_ERR_VALUE(err)) {
525 err = p9_errstr2errno(ename, strlen(ename));
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500526
Joe Perches5d385152011-11-28 10:40:46 -0800527 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
528 -ecode, ename);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800529 }
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530530 kfree(ename);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800531 } else {
532 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
533 err = -ecode;
534
Joe Perches5d385152011-11-28 10:40:46 -0800535 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800536 }
537
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500538 return err;
Arun R Bharadwaj4f7ebe82010-07-28 14:17:26 +0530539
540out_err:
Joe Perches5d385152011-11-28 10:40:46 -0800541 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
Arun R Bharadwaj4f7ebe82010-07-28 14:17:26 +0530542
543 return err;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500544}
545
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530546/**
547 * p9_check_zc_errors - check 9p packet for error return and process it
548 * @c: current client instance
549 * @req: request to parse and check for error conditions
550 * @in_hdrlen: Size of response protocol buffer.
551 *
552 * returns error code if one is discovered, otherwise returns 0
553 *
554 * this will have to be more complicated if we have multiple
555 * error packet types
556 */
557
558static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
Al Viro4f3b35c2015-04-01 19:57:53 -0400559 struct iov_iter *uidata, int in_hdrlen)
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530560{
561 int err;
562 int ecode;
563 int8_t type;
564 char *ename = NULL;
565
566 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530567 /*
568 * dump the response from server
569 * This should be after parse_header which poplulate pdu_fcall.
570 */
571 trace_9p_protocol_dump(c, req->rc);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530572 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800573 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530574 return err;
575 }
576
577 if (type != P9_RERROR && type != P9_RLERROR)
578 return 0;
579
580 if (!p9_is_proto_dotl(c)) {
581 /* Error is reported in string format */
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530582 int len;
583 /* 7 = header size for RERROR; */
584 int inline_len = in_hdrlen - 7;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530585
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530586 len = req->rc->size - req->rc->offset;
587 if (len > (P9_ZC_HDR_SZ - 7)) {
588 err = -EFAULT;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530589 goto out_err;
590 }
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530591
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530592 ename = &req->rc->sdata[req->rc->offset];
593 if (len > inline_len) {
594 /* We have error in external buffer */
Al Viro4f3b35c2015-04-01 19:57:53 -0400595 err = copy_from_iter(ename + inline_len,
596 len - inline_len, uidata);
597 if (err != len - inline_len) {
598 err = -EFAULT;
599 goto out_err;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530600 }
601 }
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530602 ename = NULL;
603 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
604 &ename, &ecode);
605 if (err)
606 goto out_err;
607
608 if (p9_is_proto_dotu(c))
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530609 err = -ecode;
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530610
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530611 if (!err || !IS_ERR_VALUE(err)) {
612 err = p9_errstr2errno(ename, strlen(ename));
613
Joe Perches5d385152011-11-28 10:40:46 -0800614 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
615 -ecode, ename);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530616 }
617 kfree(ename);
618 } else {
619 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
620 err = -ecode;
621
Joe Perches5d385152011-11-28 10:40:46 -0800622 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530623 }
624 return err;
625
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530626out_err:
Joe Perches5d385152011-11-28 10:40:46 -0800627 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530628 return err;
629}
630
Rob Landleyaca00762011-05-08 18:46:38 +0000631static struct p9_req_t *
632p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
633
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500634/**
635 * p9_client_flush - flush (cancel) a request
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600636 * @c: client state
637 * @oldreq: request to cancel
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500638 *
Rob Landleyaca00762011-05-08 18:46:38 +0000639 * This sents a flush for a particular request and links
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500640 * the flush request to the original request. The current
641 * code only supports a single flush request although the protocol
642 * allows for multiple flush requests to be sent for a single request.
643 *
644 */
645
646static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
647{
648 struct p9_req_t *req;
649 int16_t oldtag;
650 int err;
651
652 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
653 if (err)
654 return err;
655
Joe Perches5d385152011-11-28 10:40:46 -0800656 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500657
658 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
659 if (IS_ERR(req))
660 return PTR_ERR(req);
661
Simon Derr1cff3302013-06-21 15:32:42 +0200662 /*
663 * if we haven't received a response for oldreq,
Andi Shyti60ff7792013-07-25 10:54:24 +0200664 * remove it from the list
Simon Derr1cff3302013-06-21 15:32:42 +0200665 */
Simon Derr0bfd6842014-03-10 16:38:52 +0100666 if (oldreq->status == REQ_STATUS_SENT)
Simon Derrafd8d652014-03-10 16:38:49 +0100667 if (c->trans_mod->cancelled)
668 c->trans_mod->cancelled(c, oldreq);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500669
670 p9_free_req(c, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500671 return 0;
672}
673
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530674static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
675 int8_t type, int req_size,
676 const char *fmt, va_list ap)
677{
678 int tag, err;
679 struct p9_req_t *req;
680
Joe Perches5d385152011-11-28 10:40:46 -0800681 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530682
683 /* we allow for any status other than disconnected */
684 if (c->status == Disconnected)
685 return ERR_PTR(-EIO);
686
687 /* if status is begin_disconnected we allow only clunk request */
688 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
689 return ERR_PTR(-EIO);
690
691 tag = P9_NOTAG;
692 if (type != P9_TVERSION) {
693 tag = p9_idpool_get(c->tagpool);
694 if (tag < 0)
695 return ERR_PTR(-ENOMEM);
696 }
697
698 req = p9_tag_alloc(c, tag, req_size);
699 if (IS_ERR(req))
700 return req;
701
702 /* marshall the data */
703 p9pdu_prepare(req->tc, tag, type);
704 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
705 if (err)
706 goto reterr;
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530707 p9pdu_finalize(c, req->tc);
708 trace_9p_client_req(c, type, tag);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530709 return req;
710reterr:
711 p9_free_req(c, req);
712 return ERR_PTR(err);
713}
714
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500715/**
716 * p9_client_rpc - issue a request and wait for a response
717 * @c: client session
718 * @type: type of request
719 * @fmt: protocol format string (see protocol.c)
720 *
721 * Returns request structure (which client must free using p9_free_req)
722 */
723
724static struct p9_req_t *
725p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
726{
727 va_list ap;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530728 int sigpending, err;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500729 unsigned long flags;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530730 struct p9_req_t *req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500731
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530732 va_start(ap, fmt);
733 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
734 va_end(ap);
735 if (IS_ERR(req))
736 return req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500737
738 if (signal_pending(current)) {
739 sigpending = 1;
740 clear_thread_flag(TIF_SIGPENDING);
741 } else
742 sigpending = 0;
743
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500744 err = c->trans_mod->request(c, req);
745 if (err < 0) {
M. Mohan Kumar3cd79672011-04-15 13:59:33 +0530746 if (err != -ERESTARTSYS && err != -EFAULT)
Venkateswararao Jujjuri (JV)52f44e02010-09-29 18:33:41 -0700747 c->status = Disconnected;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500748 goto reterr;
749 }
Jim Garlicka314f272012-02-01 12:48:53 -0800750again:
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530751 /* Wait for the response */
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500752 err = wait_event_interruptible(*req->wq,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530753 req->status >= REQ_STATUS_RCVD);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500754
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100755 /*
756 * Make sure our req is coherent with regard to updates in other
757 * threads - echoes to wmb() in the callback
758 */
759 smp_rmb();
760
Jim Garlicka314f272012-02-01 12:48:53 -0800761 if ((err == -ERESTARTSYS) && (c->status == Connected)
762 && (type == P9_TFLUSH)) {
763 sigpending = 1;
764 clear_thread_flag(TIF_SIGPENDING);
765 goto again;
766 }
767
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500768 if (req->status == REQ_STATUS_ERROR) {
Joe Perches5d385152011-11-28 10:40:46 -0800769 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500770 err = req->t_err;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500771 }
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500772 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
Joe Perches5d385152011-11-28 10:40:46 -0800773 p9_debug(P9_DEBUG_MUX, "flushing\n");
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500774 sigpending = 1;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500775 clear_thread_flag(TIF_SIGPENDING);
776
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500777 if (c->trans_mod->cancel(c, req))
778 p9_client_flush(c, req);
779
780 /* if we received the response anyway, don't signal error */
781 if (req->status == REQ_STATUS_RCVD)
782 err = 0;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500783 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500784 if (sigpending) {
785 spin_lock_irqsave(&current->sighand->siglock, flags);
786 recalc_sigpending();
787 spin_unlock_irqrestore(&current->sighand->siglock, flags);
788 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500789 if (err < 0)
790 goto reterr;
791
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500792 err = p9_check_errors(c, req);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530793 trace_9p_client_res(c, type, req->rc->tag, err);
794 if (!err)
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500795 return req;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530796reterr:
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530797 p9_free_req(c, req);
Simon Derr43def352012-08-10 15:52:06 +0200798 return ERR_PTR(safe_errno(err));
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530799}
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500800
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530801/**
802 * p9_client_zc_rpc - issue a request and wait for a response
803 * @c: client session
804 * @type: type of request
Al Viro4f3b35c2015-04-01 19:57:53 -0400805 * @uidata: destination for zero copy read
806 * @uodata: source for zero copy write
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530807 * @inlen: read buffer size
808 * @olen: write buffer size
809 * @hdrlen: reader header size, This is the size of response protocol data
810 * @fmt: protocol format string (see protocol.c)
811 *
812 * Returns request structure (which client must free using p9_free_req)
813 */
814static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
Al Viro4f3b35c2015-04-01 19:57:53 -0400815 struct iov_iter *uidata,
816 struct iov_iter *uodata,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530817 int inlen, int olen, int in_hdrlen,
Al Viro4f3b35c2015-04-01 19:57:53 -0400818 const char *fmt, ...)
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530819{
820 va_list ap;
821 int sigpending, err;
822 unsigned long flags;
823 struct p9_req_t *req;
824
825 va_start(ap, fmt);
826 /*
827 * We allocate a inline protocol data of only 4k bytes.
828 * The actual content is passed in zero-copy fashion.
829 */
830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
831 va_end(ap);
832 if (IS_ERR(req))
833 return req;
834
835 if (signal_pending(current)) {
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838 } else
839 sigpending = 0;
840
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530841 err = c->trans_mod->zc_request(c, req, uidata, uodata,
Al Viro4f3b35c2015-04-01 19:57:53 -0400842 inlen, olen, in_hdrlen);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530843 if (err < 0) {
844 if (err == -EIO)
845 c->status = Disconnected;
Al Viroa84b69c2015-07-04 16:04:19 -0400846 if (err != -ERESTARTSYS)
847 goto reterr;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530848 }
849 if (req->status == REQ_STATUS_ERROR) {
Joe Perches5d385152011-11-28 10:40:46 -0800850 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530851 err = req->t_err;
852 }
853 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
Joe Perches5d385152011-11-28 10:40:46 -0800854 p9_debug(P9_DEBUG_MUX, "flushing\n");
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530855 sigpending = 1;
856 clear_thread_flag(TIF_SIGPENDING);
857
858 if (c->trans_mod->cancel(c, req))
859 p9_client_flush(c, req);
860
861 /* if we received the response anyway, don't signal error */
862 if (req->status == REQ_STATUS_RCVD)
863 err = 0;
864 }
865 if (sigpending) {
866 spin_lock_irqsave(&current->sighand->siglock, flags);
867 recalc_sigpending();
868 spin_unlock_irqrestore(&current->sighand->siglock, flags);
869 }
870 if (err < 0)
871 goto reterr;
872
Al Viro4f3b35c2015-04-01 19:57:53 -0400873 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530874 trace_9p_client_res(c, type, req->rc->tag, err);
875 if (!err)
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530876 return req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500877reterr:
878 p9_free_req(c, req);
Simon Derr43def352012-08-10 15:52:06 +0200879 return ERR_PTR(safe_errno(err));
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500880}
881
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500882static struct p9_fid *p9_fid_create(struct p9_client *clnt)
883{
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500884 int ret;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500885 struct p9_fid *fid;
Tom Tuckercac23d62008-10-23 16:31:02 -0500886 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500887
Joe Perches5d385152011-11-28 10:40:46 -0800888 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500889 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
890 if (!fid)
891 return ERR_PTR(-ENOMEM);
892
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500893 ret = p9_idpool_get(clnt->fidpool);
Roel Kluin24e94de2009-01-18 21:32:11 -0800894 if (ret < 0) {
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500895 ret = -ENOSPC;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500896 goto error;
897 }
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500898 fid->fid = ret;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500899
900 memset(&fid->qid, 0, sizeof(struct p9_qid));
901 fid->mode = -1;
David Howellsf8b9d532008-11-14 10:38:44 +1100902 fid->uid = current_fsuid();
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500903 fid->clnt = clnt;
Eric Van Hensbergen3e2796a2009-11-02 08:39:28 -0600904 fid->rdir = NULL;
Tom Tuckercac23d62008-10-23 16:31:02 -0500905 spin_lock_irqsave(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500906 list_add(&fid->flist, &clnt->fidlist);
Tom Tuckercac23d62008-10-23 16:31:02 -0500907 spin_unlock_irqrestore(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500908
909 return fid;
910
911error:
912 kfree(fid);
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500913 return ERR_PTR(ret);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500914}
915
916static void p9_fid_destroy(struct p9_fid *fid)
917{
918 struct p9_client *clnt;
Tom Tuckercac23d62008-10-23 16:31:02 -0500919 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500920
Joe Perches5d385152011-11-28 10:40:46 -0800921 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500922 clnt = fid->clnt;
923 p9_idpool_put(fid->fid, clnt->fidpool);
Tom Tuckercac23d62008-10-23 16:31:02 -0500924 spin_lock_irqsave(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500925 list_del(&fid->flist);
Tom Tuckercac23d62008-10-23 16:31:02 -0500926 spin_unlock_irqrestore(&clnt->lock, flags);
Eric Van Hensbergen3e2796a2009-11-02 08:39:28 -0600927 kfree(fid->rdir);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500928 kfree(fid);
929}
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600930
stephen hemminger32a875a2010-10-19 06:48:16 +0000931static int p9_client_version(struct p9_client *c)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500932{
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500933 int err = 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500934 struct p9_req_t *req;
935 char *version;
936 int msize;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500937
Joe Perches5d385152011-11-28 10:40:46 -0800938 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
939 c->msize, c->proto_version);
Sripathi Kodic5a76972010-03-05 18:51:04 +0000940
941 switch (c->proto_version) {
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000942 case p9_proto_2000L:
Sripathi Kodic5a76972010-03-05 18:51:04 +0000943 req = p9_client_rpc(c, P9_TVERSION, "ds",
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000944 c->msize, "9P2000.L");
Sripathi Kodic5a76972010-03-05 18:51:04 +0000945 break;
946 case p9_proto_2000u:
947 req = p9_client_rpc(c, P9_TVERSION, "ds",
948 c->msize, "9P2000.u");
949 break;
950 case p9_proto_legacy:
951 req = p9_client_rpc(c, P9_TVERSION, "ds",
952 c->msize, "9P2000");
953 break;
954 default:
955 return -EINVAL;
Sripathi Kodic5a76972010-03-05 18:51:04 +0000956 }
957
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500958 if (IS_ERR(req))
959 return PTR_ERR(req);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500960
Sripathi Kodi342fee12010-03-05 18:50:14 +0000961 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500962 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800963 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530964 trace_9p_protocol_dump(c, req->rc);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500965 goto error;
966 }
967
Joe Perches5d385152011-11-28 10:40:46 -0800968 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000969 if (!strncmp(version, "9P2000.L", 8))
970 c->proto_version = p9_proto_2000L;
Sripathi Kodic5a76972010-03-05 18:51:04 +0000971 else if (!strncmp(version, "9P2000.u", 8))
Sripathi Kodi342fee12010-03-05 18:50:14 +0000972 c->proto_version = p9_proto_2000u;
973 else if (!strncmp(version, "9P2000", 6))
974 c->proto_version = p9_proto_legacy;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500975 else {
976 err = -EREMOTEIO;
977 goto error;
978 }
979
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500980 if (msize < c->msize)
981 c->msize = msize;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500982
983error:
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500984 kfree(version);
985 p9_free_req(c, req);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500986
987 return err;
988}
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500989
990struct p9_client *p9_client_create(const char *dev_name, char *options)
991{
992 int err;
993 struct p9_client *clnt;
Will Deacon50192ab2013-08-21 18:24:47 +0100994 char *client_id;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500995
996 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500997 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
998 if (!clnt)
999 return ERR_PTR(-ENOMEM);
1000
Tejun Heo72029fe2008-09-24 16:22:23 -05001001 clnt->trans_mod = NULL;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001002 clnt->trans = NULL;
Will Deacon50192ab2013-08-21 18:24:47 +01001003
1004 client_id = utsname()->nodename;
1005 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1006
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001007 spin_lock_init(&clnt->lock);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001008 INIT_LIST_HEAD(&clnt->fidlist);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001009
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001010 err = p9_tag_init(clnt);
1011 if (err < 0)
1012 goto free_client;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -05001013
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001014 err = parse_opts(options, clnt);
1015 if (err < 0)
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001016 goto destroy_tagpool;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001017
Abhishek Kulkarnia17d1722009-07-14 13:24:10 -05001018 if (!clnt->trans_mod)
1019 clnt->trans_mod = v9fs_get_default_trans();
1020
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001021 if (clnt->trans_mod == NULL) {
1022 err = -EPROTONOSUPPORT;
Joe Perches5d385152011-11-28 10:40:46 -08001023 p9_debug(P9_DEBUG_ERROR,
1024 "No transport defined or default transport\n");
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001025 goto destroy_tagpool;
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001026 }
1027
1028 clnt->fidpool = p9_idpool_create();
1029 if (IS_ERR(clnt->fidpool)) {
1030 err = PTR_ERR(clnt->fidpool);
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001031 goto put_trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001032 }
1033
Joe Perches5d385152011-11-28 10:40:46 -08001034 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1035 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001036
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001037 err = clnt->trans_mod->create(clnt, dev_name, options);
1038 if (err)
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001039 goto destroy_fidpool;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001040
Venkateswararao Jujjuri (JV)c9ffb052011-06-29 18:06:33 -07001041 if (clnt->msize > clnt->trans_mod->maxsize)
1042 clnt->msize = clnt->trans_mod->maxsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001043
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -05001044 err = p9_client_version(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001045 if (err)
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001046 goto close_trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001047
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001048 return clnt;
1049
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001050close_trans:
1051 clnt->trans_mod->close(clnt);
1052destroy_fidpool:
1053 p9_idpool_destroy(clnt->fidpool);
1054put_trans:
1055 v9fs_put_trans(clnt->trans_mod);
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001056destroy_tagpool:
1057 p9_idpool_destroy(clnt->tagpool);
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001058free_client:
1059 kfree(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001060 return ERR_PTR(err);
1061}
1062EXPORT_SYMBOL(p9_client_create);
1063
1064void p9_client_destroy(struct p9_client *clnt)
1065{
1066 struct p9_fid *fid, *fidptr;
1067
Joe Perches5d385152011-11-28 10:40:46 -08001068 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001069
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001070 if (clnt->trans_mod)
1071 clnt->trans_mod->close(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001072
Tejun Heo72029fe2008-09-24 16:22:23 -05001073 v9fs_put_trans(clnt->trans_mod);
1074
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001075 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
Joe Perches5d385152011-11-28 10:40:46 -08001076 pr_info("Found fid %d not clunked\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001077 p9_fid_destroy(fid);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001078 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001079
Eric Van Hensbergen0af88872007-07-13 16:47:58 -05001080 if (clnt->fidpool)
1081 p9_idpool_destroy(clnt->fidpool);
1082
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -05001083 p9_tag_cleanup(clnt);
1084
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001085 kfree(clnt);
1086}
1087EXPORT_SYMBOL(p9_client_destroy);
1088
1089void p9_client_disconnect(struct p9_client *clnt)
1090{
Joe Perches5d385152011-11-28 10:40:46 -08001091 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001092 clnt->status = Disconnected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001093}
1094EXPORT_SYMBOL(p9_client_disconnect);
1095
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001096void p9_client_begin_disconnect(struct p9_client *clnt)
1097{
Joe Perches5d385152011-11-28 10:40:46 -08001098 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001099 clnt->status = BeginDisconnect;
1100}
1101EXPORT_SYMBOL(p9_client_begin_disconnect);
1102
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001103struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001104 char *uname, kuid_t n_uname, char *aname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001105{
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301106 int err = 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001107 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001108 struct p9_fid *fid;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001109 struct p9_qid qid;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001110
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001111
Joe Perches5d385152011-11-28 10:40:46 -08001112 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1113 afid ? afid->fid : -1, uname, aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001114 fid = p9_fid_create(clnt);
1115 if (IS_ERR(fid)) {
1116 err = PTR_ERR(fid);
1117 fid = NULL;
1118 goto error;
1119 }
Al Viro21c9f5c2015-04-02 21:47:49 -04001120 fid->uid = n_uname;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001121
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001122 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001123 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1124 if (IS_ERR(req)) {
1125 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001126 goto error;
1127 }
1128
Sripathi Kodi342fee12010-03-05 18:50:14 +00001129 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001130 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301131 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001132 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001133 goto error;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001134 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001135
Joe Perches5d385152011-11-28 10:40:46 -08001136 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1137 qid.type, (unsigned long long)qid.path, qid.version);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001138
1139 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1140
1141 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001142 return fid;
1143
1144error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001145 if (fid)
1146 p9_fid_destroy(fid);
1147 return ERR_PTR(err);
1148}
1149EXPORT_SYMBOL(p9_client_attach);
1150
Harsh Prateek Borab76225e2011-03-31 15:49:39 +05301151struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1152 char **wnames, int clone)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001153{
1154 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001155 struct p9_client *clnt;
1156 struct p9_fid *fid;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001157 struct p9_qid *wqids;
1158 struct p9_req_t *req;
Harsh Prateek Borab76225e2011-03-31 15:49:39 +05301159 uint16_t nwqids, count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001160
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001161 err = 0;
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001162 wqids = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001163 clnt = oldfid->clnt;
1164 if (clone) {
1165 fid = p9_fid_create(clnt);
1166 if (IS_ERR(fid)) {
1167 err = PTR_ERR(fid);
1168 fid = NULL;
1169 goto error;
1170 }
1171
1172 fid->uid = oldfid->uid;
1173 } else
1174 fid = oldfid;
1175
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001176
Joe Perches5d385152011-11-28 10:40:46 -08001177 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1178 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001179
1180 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1181 nwname, wnames);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001184 goto error;
1185 }
1186
Sripathi Kodi342fee12010-03-05 18:50:14 +00001187 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001188 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301189 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001190 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001191 goto clunk_fid;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001192 }
1193 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001194
Joe Perches5d385152011-11-28 10:40:46 -08001195 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001196
1197 if (nwqids != nwname) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001198 err = -ENOENT;
1199 goto clunk_fid;
1200 }
1201
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001202 for (count = 0; count < nwqids; count++)
Joe Perches5d385152011-11-28 10:40:46 -08001203 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001204 count, wqids[count].type,
1205 (unsigned long long)wqids[count].path,
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001206 wqids[count].version);
1207
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001208 if (nwname)
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001209 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001210 else
1211 fid->qid = oldfid->qid;
1212
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001213 kfree(wqids);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001214 return fid;
1215
1216clunk_fid:
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001217 kfree(wqids);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001218 p9_client_clunk(fid);
1219 fid = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001220
1221error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001222 if (fid && (fid != oldfid))
1223 p9_fid_destroy(fid);
1224
1225 return ERR_PTR(err);
1226}
1227EXPORT_SYMBOL(p9_client_walk);
1228
1229int p9_client_open(struct p9_fid *fid, int mode)
1230{
1231 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001232 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001233 struct p9_req_t *req;
1234 struct p9_qid qid;
1235 int iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001236
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001237 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08001238 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
M. Mohan Kumaref565472010-06-22 19:47:50 +05301239 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1240 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001241
1242 if (fid->mode != -1)
1243 return -EINVAL;
1244
M. Mohan Kumaref565472010-06-22 19:47:50 +05301245 if (p9_is_proto_dotl(clnt))
1246 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1247 else
1248 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001249 if (IS_ERR(req)) {
1250 err = PTR_ERR(req);
1251 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001252 }
1253
Sripathi Kodi342fee12010-03-05 18:50:14 +00001254 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001255 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301256 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001257 goto free_and_error;
1258 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001259
Joe Perches5d385152011-11-28 10:40:46 -08001260 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
M. Mohan Kumaref565472010-06-22 19:47:50 +05301261 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1262 (unsigned long long)qid.path, qid.version, iounit);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001263
1264 fid->mode = mode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001265 fid->iounit = iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001266
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001267free_and_error:
1268 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001269error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001270 return err;
1271}
1272EXPORT_SYMBOL(p9_client_open);
1273
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001274int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001275 kgid_t gid, struct p9_qid *qid)
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001276{
1277 int err = 0;
1278 struct p9_client *clnt;
1279 struct p9_req_t *req;
1280 int iounit;
1281
Joe Perches5d385152011-11-28 10:40:46 -08001282 p9_debug(P9_DEBUG_9P,
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001283 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001284 ofid->fid, name, flags, mode,
1285 from_kgid(&init_user_ns, gid));
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001286 clnt = ofid->clnt;
1287
1288 if (ofid->mode != -1)
1289 return -EINVAL;
1290
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001291 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001292 mode, gid);
1293 if (IS_ERR(req)) {
1294 err = PTR_ERR(req);
1295 goto error;
1296 }
1297
1298 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1299 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301300 trace_9p_protocol_dump(clnt, req->rc);
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001301 goto free_and_error;
1302 }
1303
Joe Perches5d385152011-11-28 10:40:46 -08001304 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001305 qid->type,
1306 (unsigned long long)qid->path,
1307 qid->version, iounit);
1308
1309 ofid->mode = mode;
1310 ofid->iounit = iounit;
1311
1312free_and_error:
1313 p9_free_req(clnt, req);
1314error:
1315 return err;
1316}
1317EXPORT_SYMBOL(p9_client_create_dotl);
1318
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001319int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1320 char *extension)
1321{
1322 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001323 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001324 struct p9_req_t *req;
1325 struct p9_qid qid;
1326 int iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001327
Joe Perches5d385152011-11-28 10:40:46 -08001328 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001329 fid->fid, name, perm, mode);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001330 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001331 clnt = fid->clnt;
1332
1333 if (fid->mode != -1)
1334 return -EINVAL;
1335
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001336 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1337 mode, extension);
1338 if (IS_ERR(req)) {
1339 err = PTR_ERR(req);
1340 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001341 }
1342
Sripathi Kodi342fee12010-03-05 18:50:14 +00001343 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001344 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301345 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001346 goto free_and_error;
1347 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001348
Joe Perches5d385152011-11-28 10:40:46 -08001349 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001350 qid.type,
1351 (unsigned long long)qid.path,
1352 qid.version, iounit);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001353
1354 fid->mode = mode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001355 fid->iounit = iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001356
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001357free_and_error:
1358 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001359error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001360 return err;
1361}
1362EXPORT_SYMBOL(p9_client_fcreate);
1363
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001364int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001365 struct p9_qid *qid)
1366{
1367 int err = 0;
1368 struct p9_client *clnt;
1369 struct p9_req_t *req;
1370
Joe Perches5d385152011-11-28 10:40:46 -08001371 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001372 dfid->fid, name, symtgt);
1373 clnt = dfid->clnt;
1374
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001375 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001376 gid);
1377 if (IS_ERR(req)) {
1378 err = PTR_ERR(req);
1379 goto error;
1380 }
1381
1382 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1383 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301384 trace_9p_protocol_dump(clnt, req->rc);
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001385 goto free_and_error;
1386 }
1387
Joe Perches5d385152011-11-28 10:40:46 -08001388 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001389 qid->type, (unsigned long long)qid->path, qid->version);
1390
1391free_and_error:
1392 p9_free_req(clnt, req);
1393error:
1394 return err;
1395}
1396EXPORT_SYMBOL(p9_client_symlink);
1397
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001398int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1399{
1400 struct p9_client *clnt;
1401 struct p9_req_t *req;
1402
Joe Perches5d385152011-11-28 10:40:46 -08001403 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001404 dfid->fid, oldfid->fid, newname);
1405 clnt = dfid->clnt;
1406 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1407 newname);
1408 if (IS_ERR(req))
1409 return PTR_ERR(req);
1410
Joe Perches5d385152011-11-28 10:40:46 -08001411 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001412 p9_free_req(clnt, req);
1413 return 0;
1414}
1415EXPORT_SYMBOL(p9_client_link);
1416
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001417int p9_client_fsync(struct p9_fid *fid, int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001418{
1419 int err;
1420 struct p9_client *clnt;
1421 struct p9_req_t *req;
1422
Joe Perches5d385152011-11-28 10:40:46 -08001423 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001424 fid->fid, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001425 err = 0;
1426 clnt = fid->clnt;
1427
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001428 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001429 if (IS_ERR(req)) {
1430 err = PTR_ERR(req);
1431 goto error;
1432 }
1433
Joe Perches5d385152011-11-28 10:40:46 -08001434 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001435
1436 p9_free_req(clnt, req);
1437
1438error:
1439 return err;
1440}
1441EXPORT_SYMBOL(p9_client_fsync);
1442
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001443int p9_client_clunk(struct p9_fid *fid)
1444{
1445 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001446 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001447 struct p9_req_t *req;
Jim Garlick208f3c22012-02-26 14:49:57 -06001448 int retries = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001449
jvrao8e44a082010-08-25 16:27:06 +00001450 if (!fid) {
Joe Perches5d385152011-11-28 10:40:46 -08001451 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1452 __func__, task_pid_nr(current));
jvrao8e44a082010-08-25 16:27:06 +00001453 dump_stack();
1454 return 0;
1455 }
1456
Jim Garlick208f3c22012-02-26 14:49:57 -06001457again:
1458 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1459 retries);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001460 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001461 clnt = fid->clnt;
1462
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001463 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1464 if (IS_ERR(req)) {
1465 err = PTR_ERR(req);
1466 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001467 }
1468
Joe Perches5d385152011-11-28 10:40:46 -08001469 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001470
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001471 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001472error:
Aneesh Kumar K.V50349902011-07-11 16:40:58 +00001473 /*
1474 * Fid is not valid even after a failed clunk
Jim Garlick208f3c22012-02-26 14:49:57 -06001475 * If interrupted, retry once then give up and
1476 * leak fid until umount.
Aneesh Kumar K.V50349902011-07-11 16:40:58 +00001477 */
Jim Garlick208f3c22012-02-26 14:49:57 -06001478 if (err == -ERESTARTSYS) {
1479 if (retries++ == 0)
1480 goto again;
1481 } else
1482 p9_fid_destroy(fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001483 return err;
1484}
1485EXPORT_SYMBOL(p9_client_clunk);
1486
1487int p9_client_remove(struct p9_fid *fid)
1488{
1489 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001490 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001491 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001492
Joe Perches5d385152011-11-28 10:40:46 -08001493 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001494 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001495 clnt = fid->clnt;
1496
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001497 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1498 if (IS_ERR(req)) {
1499 err = PTR_ERR(req);
1500 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001501 }
1502
Joe Perches5d385152011-11-28 10:40:46 -08001503 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001504
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001505 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001506error:
Jim Garlick208f3c22012-02-26 14:49:57 -06001507 if (err == -ERESTARTSYS)
1508 p9_client_clunk(fid);
1509 else
1510 p9_fid_destroy(fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001511 return err;
1512}
1513EXPORT_SYMBOL(p9_client_remove);
1514
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301515int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1516{
1517 int err = 0;
1518 struct p9_req_t *req;
1519 struct p9_client *clnt;
1520
Joe Perches5d385152011-11-28 10:40:46 -08001521 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301522 dfid->fid, name, flags);
1523
1524 clnt = dfid->clnt;
1525 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1526 if (IS_ERR(req)) {
1527 err = PTR_ERR(req);
1528 goto error;
1529 }
Joe Perches5d385152011-11-28 10:40:46 -08001530 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301531
1532 p9_free_req(clnt, req);
1533error:
1534 return err;
1535}
1536EXPORT_SYMBOL(p9_client_unlinkat);
1537
Eric Van Hensbergen0fc96552008-10-13 20:36:17 -05001538int
Al Viroe1200fe62015-04-01 23:42:28 -04001539p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001540{
Al Viroe1200fe62015-04-01 23:42:28 -04001541 struct p9_client *clnt = fid->clnt;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301542 struct p9_req_t *req;
Al Viroe1200fe62015-04-01 23:42:28 -04001543 int total = 0;
Vincent Bernat999b8b82015-08-15 15:49:13 +02001544 *err = 0;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301545
Joe Perches5d385152011-11-28 10:40:46 -08001546 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
Al Viroe1200fe62015-04-01 23:42:28 -04001547 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001548
Al Viroe1200fe62015-04-01 23:42:28 -04001549 while (iov_iter_count(to)) {
1550 int count = iov_iter_count(to);
1551 int rsize, non_zc = 0;
1552 char *dataptr;
1553
1554 rsize = fid->iounit;
1555 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1556 rsize = clnt->msize - P9_IOHDRSZ;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001557
Al Viroe1200fe62015-04-01 23:42:28 -04001558 if (count < rsize)
1559 rsize = count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001560
Al Viroe1200fe62015-04-01 23:42:28 -04001561 /* Don't bother zerocopy for small IO (< 1024) */
1562 if (clnt->trans_mod->zc_request && rsize > 1024) {
1563 /*
1564 * response header len is 11
1565 * PDU Header(7) + IO Size (4)
1566 */
1567 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1568 0, 11, "dqd", fid->fid,
1569 offset, rsize);
1570 } else {
1571 non_zc = 1;
1572 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1573 rsize);
1574 }
1575 if (IS_ERR(req)) {
1576 *err = PTR_ERR(req);
1577 break;
1578 }
1579
1580 *err = p9pdu_readf(req->rc, clnt->proto_version,
1581 "D", &count, &dataptr);
1582 if (*err) {
1583 trace_9p_protocol_dump(clnt, req->rc);
1584 p9_free_req(clnt, req);
1585 break;
1586 }
Al Viro0f1db7d2015-07-04 16:17:39 -04001587 if (rsize < count) {
1588 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1589 count = rsize;
1590 }
Al Viroe1200fe62015-04-01 23:42:28 -04001591
1592 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1593 if (!count) {
1594 p9_free_req(clnt, req);
1595 break;
1596 }
1597
1598 if (non_zc) {
1599 int n = copy_to_iter(dataptr, count, to);
1600 total += n;
1601 offset += n;
1602 if (n != count) {
1603 *err = -EFAULT;
1604 p9_free_req(clnt, req);
1605 break;
1606 }
1607 } else {
1608 iov_iter_advance(to, count);
1609 total += count;
1610 offset += count;
1611 }
1612 p9_free_req(clnt, req);
Venkateswararao Jujjuri (JV)bb2f8a52011-01-28 17:05:59 -08001613 }
Al Viroe1200fe62015-04-01 23:42:28 -04001614 return total;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001615}
1616EXPORT_SYMBOL(p9_client_read);
1617
Eric Van Hensbergen0fc96552008-10-13 20:36:17 -05001618int
Al Viro070b3652015-04-01 20:17:51 -04001619p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001620{
Al Viro070b3652015-04-01 20:17:51 -04001621 struct p9_client *clnt = fid->clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001622 struct p9_req_t *req;
Al Viro070b3652015-04-01 20:17:51 -04001623 int total = 0;
Vincent Bernat999b8b82015-08-15 15:49:13 +02001624 *err = 0;
Al Viro4f3b35c2015-04-01 19:57:53 -04001625
Al Viro070b3652015-04-01 20:17:51 -04001626 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1627 fid->fid, (unsigned long long) offset,
1628 iov_iter_count(from));
1629
1630 while (iov_iter_count(from)) {
1631 int count = iov_iter_count(from);
1632 int rsize = fid->iounit;
1633 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1634 rsize = clnt->msize - P9_IOHDRSZ;
1635
1636 if (count < rsize)
1637 rsize = count;
1638
1639 /* Don't bother zerocopy for small IO (< 1024) */
1640 if (clnt->trans_mod->zc_request && rsize > 1024) {
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1642 rsize, P9_ZC_HDR_SZ, "dqd",
1643 fid->fid, offset, rsize);
1644 } else {
1645 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1646 offset, rsize, from);
1647 }
1648 if (IS_ERR(req)) {
1649 *err = PTR_ERR(req);
1650 break;
1651 }
1652
1653 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1654 if (*err) {
1655 trace_9p_protocol_dump(clnt, req->rc);
1656 p9_free_req(clnt, req);
Al Viro67e808f2015-07-04 16:11:05 -04001657 break;
Al Viro070b3652015-04-01 20:17:51 -04001658 }
Al Viro0f1db7d2015-07-04 16:17:39 -04001659 if (rsize < count) {
1660 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1661 count = rsize;
1662 }
Al Viro070b3652015-04-01 20:17:51 -04001663
1664 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1665
1666 p9_free_req(clnt, req);
1667 iov_iter_advance(from, count);
1668 total += count;
1669 offset += count;
Al Viro4f3b35c2015-04-01 19:57:53 -04001670 }
Al Viro070b3652015-04-01 20:17:51 -04001671 return total;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001672}
1673EXPORT_SYMBOL(p9_client_write);
1674
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001675struct p9_wstat *p9_client_stat(struct p9_fid *fid)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001676{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001677 int err;
1678 struct p9_client *clnt;
1679 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1680 struct p9_req_t *req;
1681 u16 ignored;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001682
Joe Perches5d385152011-11-28 10:40:46 -08001683 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001684
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001685 if (!ret)
1686 return ERR_PTR(-ENOMEM);
1687
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001688 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001689 clnt = fid->clnt;
1690
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001691 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1692 if (IS_ERR(req)) {
1693 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001694 goto error;
1695 }
1696
Sripathi Kodi342fee12010-03-05 18:50:14 +00001697 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001698 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301699 trace_9p_protocol_dump(clnt, req->rc);
Abhishek Kulkarnieedfe1c2009-07-14 13:25:41 -05001700 p9_free_req(clnt, req);
1701 goto error;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001702 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001703
Joe Perches5d385152011-11-28 10:40:46 -08001704 p9_debug(P9_DEBUG_9P,
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001705 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1706 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1707 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1708 "<<< uid=%d gid=%d n_muid=%d\n",
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001709 ret->size, ret->type, ret->dev, ret->qid.type,
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001710 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1711 ret->atime, ret->mtime, (unsigned long long)ret->length,
1712 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001713 from_kuid(&init_user_ns, ret->n_uid),
1714 from_kgid(&init_user_ns, ret->n_gid),
1715 from_kuid(&init_user_ns, ret->n_muid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001716
Latchesar Ionkov742b11a2009-04-05 16:26:41 -05001717 p9_free_req(clnt, req);
1718 return ret;
1719
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001720error:
Latchesar Ionkov742b11a2009-04-05 16:26:41 -05001721 kfree(ret);
1722 return ERR_PTR(err);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001723}
1724EXPORT_SYMBOL(p9_client_stat);
1725
Sripathi Kodif0853122010-07-12 20:07:23 +05301726struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1727 u64 request_mask)
1728{
1729 int err;
1730 struct p9_client *clnt;
1731 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1732 GFP_KERNEL);
1733 struct p9_req_t *req;
1734
Joe Perches5d385152011-11-28 10:40:46 -08001735 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
Sripathi Kodif0853122010-07-12 20:07:23 +05301736 fid->fid, request_mask);
1737
1738 if (!ret)
1739 return ERR_PTR(-ENOMEM);
1740
1741 err = 0;
1742 clnt = fid->clnt;
1743
1744 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1745 if (IS_ERR(req)) {
1746 err = PTR_ERR(req);
1747 goto error;
1748 }
1749
1750 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1751 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301752 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodif0853122010-07-12 20:07:23 +05301753 p9_free_req(clnt, req);
1754 goto error;
1755 }
1756
Joe Perches5d385152011-11-28 10:40:46 -08001757 p9_debug(P9_DEBUG_9P,
Sripathi Kodif0853122010-07-12 20:07:23 +05301758 "<<< RGETATTR st_result_mask=%lld\n"
1759 "<<< qid=%x.%llx.%x\n"
1760 "<<< st_mode=%8.8x st_nlink=%llu\n"
1761 "<<< st_uid=%d st_gid=%d\n"
1762 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1763 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1764 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1765 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1766 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1767 "<<< st_gen=%lld st_data_version=%lld",
1768 ret->st_result_mask, ret->qid.type, ret->qid.path,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001769 ret->qid.version, ret->st_mode, ret->st_nlink,
1770 from_kuid(&init_user_ns, ret->st_uid),
1771 from_kgid(&init_user_ns, ret->st_gid),
1772 ret->st_rdev, ret->st_size, ret->st_blksize,
Sripathi Kodif0853122010-07-12 20:07:23 +05301773 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1774 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1775 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1776 ret->st_gen, ret->st_data_version);
1777
1778 p9_free_req(clnt, req);
1779 return ret;
1780
1781error:
1782 kfree(ret);
1783 return ERR_PTR(err);
1784}
1785EXPORT_SYMBOL(p9_client_getattr_dotl);
1786
Sripathi Kodi342fee12010-03-05 18:50:14 +00001787static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001788{
1789 int ret;
1790
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001791 /* NOTE: size shouldn't include its own length */
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001792 /* size[2] type[2] dev[4] qid[13] */
1793 /* mode[4] atime[4] mtime[4] length[8]*/
1794 /* name[s] uid[s] gid[s] muid[s] */
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001795 ret = 2+4+13+4+4+4+8+2+2+2+2;
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001796
1797 if (wst->name)
1798 ret += strlen(wst->name);
1799 if (wst->uid)
1800 ret += strlen(wst->uid);
1801 if (wst->gid)
1802 ret += strlen(wst->gid);
1803 if (wst->muid)
1804 ret += strlen(wst->muid);
1805
Sripathi Kodic56e4ac2010-03-25 12:40:35 +00001806 if ((proto_version == p9_proto_2000u) ||
1807 (proto_version == p9_proto_2000L)) {
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001808 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1809 if (wst->extension)
1810 ret += strlen(wst->extension);
1811 }
1812
1813 return ret;
1814}
1815
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001816int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1817{
1818 int err;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001819 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001820 struct p9_client *clnt;
1821
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001822 err = 0;
1823 clnt = fid->clnt;
Sripathi Kodi342fee12010-03-05 18:50:14 +00001824 wst->size = p9_client_statsize(wst, clnt->proto_version);
Joe Perches5d385152011-11-28 10:40:46 -08001825 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1826 p9_debug(P9_DEBUG_9P,
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001827 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1828 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1829 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1830 " uid=%d gid=%d n_muid=%d\n",
1831 wst->size, wst->type, wst->dev, wst->qid.type,
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001832 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1833 wst->atime, wst->mtime, (unsigned long long)wst->length,
1834 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001835 from_kuid(&init_user_ns, wst->n_uid),
1836 from_kgid(&init_user_ns, wst->n_gid),
1837 from_kuid(&init_user_ns, wst->n_muid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001838
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001839 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001840 if (IS_ERR(req)) {
1841 err = PTR_ERR(req);
1842 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001843 }
1844
Joe Perches5d385152011-11-28 10:40:46 -08001845 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001846
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001847 p9_free_req(clnt, req);
1848error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001849 return err;
1850}
1851EXPORT_SYMBOL(p9_client_wstat);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001852
Sripathi Kodi87d78452010-06-18 11:50:10 +05301853int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1854{
1855 int err;
1856 struct p9_req_t *req;
1857 struct p9_client *clnt;
1858
1859 err = 0;
1860 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08001861 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1862 p9_debug(P9_DEBUG_9P,
Sripathi Kodi87d78452010-06-18 11:50:10 +05301863 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1864 " atime_sec=%lld atime_nsec=%lld\n"
1865 " mtime_sec=%lld mtime_nsec=%lld\n",
Eric W. Biederman447c5092013-01-29 16:18:50 -08001866 p9attr->valid, p9attr->mode,
1867 from_kuid(&init_user_ns, p9attr->uid),
1868 from_kgid(&init_user_ns, p9attr->gid),
Sripathi Kodi87d78452010-06-18 11:50:10 +05301869 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1870 p9attr->mtime_sec, p9attr->mtime_nsec);
1871
1872 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1873
1874 if (IS_ERR(req)) {
1875 err = PTR_ERR(req);
1876 goto error;
1877 }
Joe Perches5d385152011-11-28 10:40:46 -08001878 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
Sripathi Kodi87d78452010-06-18 11:50:10 +05301879 p9_free_req(clnt, req);
1880error:
1881 return err;
1882}
1883EXPORT_SYMBOL(p9_client_setattr);
1884
Sripathi Kodibda8e772010-03-25 12:45:30 +00001885int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1886{
1887 int err;
1888 struct p9_req_t *req;
1889 struct p9_client *clnt;
1890
1891 err = 0;
1892 clnt = fid->clnt;
1893
Joe Perches5d385152011-11-28 10:40:46 -08001894 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001895
1896 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901
1902 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1903 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1904 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1905 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301906 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001907 p9_free_req(clnt, req);
1908 goto error;
1909 }
1910
Joe Perches5d385152011-11-28 10:40:46 -08001911 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
Sripathi Kodibda8e772010-03-25 12:45:30 +00001912 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1913 "fsid %llu namelen %ld\n",
1914 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1915 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1916 sb->fsid, (long int)sb->namelen);
1917
1918 p9_free_req(clnt, req);
1919error:
1920 return err;
1921}
1922EXPORT_SYMBOL(p9_client_statfs);
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001923
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301924int p9_client_rename(struct p9_fid *fid,
1925 struct p9_fid *newdirfid, const char *name)
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001926{
1927 int err;
1928 struct p9_req_t *req;
1929 struct p9_client *clnt;
1930
1931 err = 0;
1932 clnt = fid->clnt;
1933
Joe Perches5d385152011-11-28 10:40:46 -08001934 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001935 fid->fid, newdirfid->fid, name);
1936
1937 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1938 newdirfid->fid, name);
1939 if (IS_ERR(req)) {
1940 err = PTR_ERR(req);
1941 goto error;
1942 }
1943
Joe Perches5d385152011-11-28 10:40:46 -08001944 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001945
1946 p9_free_req(clnt, req);
1947error:
1948 return err;
1949}
1950EXPORT_SYMBOL(p9_client_rename);
1951
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301952int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1953 struct p9_fid *newdirfid, const char *new_name)
1954{
1955 int err;
1956 struct p9_req_t *req;
1957 struct p9_client *clnt;
1958
1959 err = 0;
1960 clnt = olddirfid->clnt;
1961
Joe Perches5d385152011-11-28 10:40:46 -08001962 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301963 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1964 newdirfid->fid, new_name);
1965
1966 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1967 old_name, newdirfid->fid, new_name);
1968 if (IS_ERR(req)) {
1969 err = PTR_ERR(req);
1970 goto error;
1971 }
1972
Joe Perches5d385152011-11-28 10:40:46 -08001973 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301974 newdirfid->fid, new_name);
1975
1976 p9_free_req(clnt, req);
1977error:
1978 return err;
1979}
1980EXPORT_SYMBOL(p9_client_renameat);
1981
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05301982/*
1983 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1984 */
1985struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1986 const char *attr_name, u64 *attr_size)
1987{
1988 int err;
1989 struct p9_req_t *req;
1990 struct p9_client *clnt;
1991 struct p9_fid *attr_fid;
1992
1993 err = 0;
1994 clnt = file_fid->clnt;
1995 attr_fid = p9_fid_create(clnt);
1996 if (IS_ERR(attr_fid)) {
1997 err = PTR_ERR(attr_fid);
1998 attr_fid = NULL;
1999 goto error;
2000 }
Joe Perches5d385152011-11-28 10:40:46 -08002001 p9_debug(P9_DEBUG_9P,
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302002 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2003 file_fid->fid, attr_fid->fid, attr_name);
2004
2005 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2006 file_fid->fid, attr_fid->fid, attr_name);
2007 if (IS_ERR(req)) {
2008 err = PTR_ERR(req);
2009 goto error;
2010 }
2011 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2012 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302013 trace_9p_protocol_dump(clnt, req->rc);
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302014 p9_free_req(clnt, req);
2015 goto clunk_fid;
2016 }
2017 p9_free_req(clnt, req);
Joe Perches5d385152011-11-28 10:40:46 -08002018 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302019 attr_fid->fid, *attr_size);
2020 return attr_fid;
2021clunk_fid:
2022 p9_client_clunk(attr_fid);
2023 attr_fid = NULL;
2024error:
2025 if (attr_fid && (attr_fid != file_fid))
2026 p9_fid_destroy(attr_fid);
2027
2028 return ERR_PTR(err);
2029}
2030EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2031
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302032int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2033 u64 attr_size, int flags)
2034{
2035 int err;
2036 struct p9_req_t *req;
2037 struct p9_client *clnt;
2038
Joe Perches5d385152011-11-28 10:40:46 -08002039 p9_debug(P9_DEBUG_9P,
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302040 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2041 fid->fid, name, (long long)attr_size, flags);
2042 err = 0;
2043 clnt = fid->clnt;
2044 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2045 fid->fid, name, attr_size, flags);
2046 if (IS_ERR(req)) {
2047 err = PTR_ERR(req);
2048 goto error;
2049 }
Joe Perches5d385152011-11-28 10:40:46 -08002050 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302051 p9_free_req(clnt, req);
2052error:
2053 return err;
2054}
2055EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2056
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002057int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2058{
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302059 int err, rsize, non_zc = 0;
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002060 struct p9_client *clnt;
2061 struct p9_req_t *req;
2062 char *dataptr;
Al Viro4f3b35c2015-04-01 19:57:53 -04002063 struct kvec kv = {.iov_base = data, .iov_len = count};
2064 struct iov_iter to;
2065
2066 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002067
Joe Perches5d385152011-11-28 10:40:46 -08002068 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +00002069 fid->fid, (unsigned long long) offset, count);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002070
2071 err = 0;
2072 clnt = fid->clnt;
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002073
2074 rsize = fid->iounit;
2075 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2076 rsize = clnt->msize - P9_READDIRHDRSZ;
2077
2078 if (count < rsize)
2079 rsize = count;
2080
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302081 /* Don't bother zerocopy for small IO (< 1024) */
2082 if (clnt->trans_mod->zc_request && rsize > 1024) {
2083 /*
2084 * response header len is 11
2085 * PDU Header(7) + IO Size (4)
2086 */
Al Viro4f3b35c2015-04-01 19:57:53 -04002087 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2088 11, "dqd", fid->fid, offset, rsize);
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002089 } else {
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302090 non_zc = 1;
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002091 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302092 offset, rsize);
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002093 }
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002094 if (IS_ERR(req)) {
2095 err = PTR_ERR(req);
2096 goto error;
2097 }
2098
2099 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2100 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302101 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002102 goto free_and_error;
2103 }
2104
Joe Perches5d385152011-11-28 10:40:46 -08002105 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002106
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302107 if (non_zc)
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002108 memmove(data, dataptr, count);
2109
2110 p9_free_req(clnt, req);
2111 return count;
2112
2113free_and_error:
2114 p9_free_req(clnt, req);
2115error:
2116 return err;
2117}
2118EXPORT_SYMBOL(p9_client_readdir);
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302119
2120int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002121 dev_t rdev, kgid_t gid, struct p9_qid *qid)
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302122{
2123 int err;
2124 struct p9_client *clnt;
2125 struct p9_req_t *req;
2126
2127 err = 0;
2128 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002129 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302130 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002131 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302132 MAJOR(rdev), MINOR(rdev), gid);
2133 if (IS_ERR(req))
2134 return PTR_ERR(req);
2135
2136 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2137 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302138 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302139 goto error;
2140 }
Joe Perches5d385152011-11-28 10:40:46 -08002141 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302142 (unsigned long long)qid->path, qid->version);
2143
2144error:
2145 p9_free_req(clnt, req);
2146 return err;
2147
2148}
2149EXPORT_SYMBOL(p9_client_mknod_dotl);
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302150
2151int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002152 kgid_t gid, struct p9_qid *qid)
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302153{
2154 int err;
2155 struct p9_client *clnt;
2156 struct p9_req_t *req;
2157
2158 err = 0;
2159 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002160 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002161 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2162 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302163 gid);
2164 if (IS_ERR(req))
2165 return PTR_ERR(req);
2166
2167 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2168 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302169 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302170 goto error;
2171 }
Joe Perches5d385152011-11-28 10:40:46 -08002172 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302173 (unsigned long long)qid->path, qid->version);
2174
2175error:
2176 p9_free_req(clnt, req);
2177 return err;
2178
2179}
2180EXPORT_SYMBOL(p9_client_mkdir_dotl);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302181
2182int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2183{
2184 int err;
2185 struct p9_client *clnt;
2186 struct p9_req_t *req;
2187
2188 err = 0;
2189 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002190 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
M. Mohan Kumara0990272010-09-27 11:34:24 +05302191 "start %lld length %lld proc_id %d client_id %s\n",
2192 fid->fid, flock->type, flock->flags, flock->start,
2193 flock->length, flock->proc_id, flock->client_id);
2194
2195 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2196 flock->flags, flock->start, flock->length,
2197 flock->proc_id, flock->client_id);
2198
2199 if (IS_ERR(req))
2200 return PTR_ERR(req);
2201
2202 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2203 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302204 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302205 goto error;
2206 }
Joe Perches5d385152011-11-28 10:40:46 -08002207 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302208error:
2209 p9_free_req(clnt, req);
2210 return err;
2211
2212}
2213EXPORT_SYMBOL(p9_client_lock_dotl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302214
2215int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2216{
2217 int err;
2218 struct p9_client *clnt;
2219 struct p9_req_t *req;
2220
2221 err = 0;
2222 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002223 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302224 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2225 glock->start, glock->length, glock->proc_id, glock->client_id);
2226
2227 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2228 glock->start, glock->length, glock->proc_id, glock->client_id);
2229
2230 if (IS_ERR(req))
2231 return PTR_ERR(req);
2232
2233 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2234 &glock->start, &glock->length, &glock->proc_id,
2235 &glock->client_id);
2236 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302237 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302238 goto error;
2239 }
Joe Perches5d385152011-11-28 10:40:46 -08002240 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302241 "proc_id %d client_id %s\n", glock->type, glock->start,
2242 glock->length, glock->proc_id, glock->client_id);
2243error:
2244 p9_free_req(clnt, req);
2245 return err;
2246}
2247EXPORT_SYMBOL(p9_client_getlock_dotl);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302248
2249int p9_client_readlink(struct p9_fid *fid, char **target)
2250{
2251 int err;
2252 struct p9_client *clnt;
2253 struct p9_req_t *req;
2254
2255 err = 0;
2256 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002257 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302258
2259 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2260 if (IS_ERR(req))
2261 return PTR_ERR(req);
2262
2263 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2264 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302265 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302266 goto error;
2267 }
Joe Perches5d385152011-11-28 10:40:46 -08002268 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302269error:
2270 p9_free_req(clnt, req);
2271 return err;
2272}
2273EXPORT_SYMBOL(p9_client_readlink);