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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>
37#include <net/9p/9p.h>
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050038#include <linux/parser.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050039#include <net/9p/client.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050040#include <net/9p/transport.h>
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -050041#include "protocol.h"
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050042
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +053043#define CREATE_TRACE_POINTS
44#include <trace/events/9p.h>
45
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060046/*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000055 Opt_version,
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060056 Opt_err,
57};
58
Steven Whitehousea447c092008-10-13 10:46:57 +010059static const match_table_t tokens = {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060060 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000063 {Opt_version, "version=%s"},
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060064 {Opt_err, NULL},
65};
66
Sripathi Kodi342fee12010-03-05 18:50:14 +000067inline int p9_is_proto_dotl(struct p9_client *clnt)
68{
Eric Dumazeta02cec22010-09-22 20:43:57 +000069 return clnt->proto_version == p9_proto_2000L;
Sripathi Kodi342fee12010-03-05 18:50:14 +000070}
71EXPORT_SYMBOL(p9_is_proto_dotl);
72
73inline int p9_is_proto_dotu(struct p9_client *clnt)
74{
Eric Dumazeta02cec22010-09-22 20:43:57 +000075 return clnt->proto_version == p9_proto_2000u;
Sripathi Kodi342fee12010-03-05 18:50:14 +000076}
77EXPORT_SYMBOL(p9_is_proto_dotu);
78
Simon Derr43def352012-08-10 15:52:06 +020079/*
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
82 */
83static int safe_errno(int err)
84{
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
87 return -EPROTO;
88 }
89 return err;
90}
91
92
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000093/* Interpret mount option for protocol version */
Prem Karat4d630552011-05-06 18:35:32 +053094static int get_protocol_version(char *s)
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000095{
Dan Carpenter3dc9fef2010-04-05 14:37:28 -050096 int version = -EINVAL;
97
Prem Karat4d630552011-05-06 18:35:32 +053098 if (!strcmp(s, "9p2000")) {
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +000099 version = p9_proto_legacy;
Joe Perches5d385152011-11-28 10:40:46 -0800100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
Prem Karat4d630552011-05-06 18:35:32 +0530101 } else if (!strcmp(s, "9p2000.u")) {
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000102 version = p9_proto_2000u;
Joe Perches5d385152011-11-28 10:40:46 -0800103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
Prem Karat4d630552011-05-06 18:35:32 +0530104 } else if (!strcmp(s, "9p2000.L")) {
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000105 version = p9_proto_2000L;
Joe Perches5d385152011-11-28 10:40:46 -0800106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
Prem Karat4d630552011-05-06 18:35:32 +0530107 } else
Joe Perches5d385152011-11-28 10:40:46 -0800108 pr_info("Unknown protocol version %s\n", s);
Prem Karat4d630552011-05-06 18:35:32 +0530109
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000110 return version;
111}
112
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600113/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600117 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600118 * Return 0 upon success, -ERRNO upon failure
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600119 */
120
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600121static int parse_opts(char *opts, struct p9_client *clnt)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600122{
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600123 char *options, *tmp_options;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600124 char *p;
125 substring_t args[MAX_OPT_ARGS];
126 int option;
Prem Karat4d630552011-05-06 18:35:32 +0530127 char *s;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600128 int ret = 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600129
Aneesh Kumar K.V095e7992013-05-20 12:20:54 +0530130 clnt->proto_version = p9_proto_2000L;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600131 clnt->msize = 8192;
132
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600133 if (!opts)
134 return 0;
135
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600136 tmp_options = kstrdup(opts, GFP_KERNEL);
137 if (!tmp_options) {
Joe Perches5d385152011-11-28 10:40:46 -0800138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600140 return -ENOMEM;
141 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600142 options = tmp_options;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600143
144 while ((p = strsep(&options, ",")) != NULL) {
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530145 int token, r;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600146 if (!*p)
147 continue;
148 token = match_token(p, tokens, args);
Aneesh Kumar K.V4d5077f2011-08-30 12:19:34 +0530149 switch (token) {
150 case Opt_msize:
151 r = match_int(&args[0], &option);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600152 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600155 ret = r;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600156 continue;
157 }
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600158 clnt->msize = option;
159 break;
160 case Opt_trans:
Prem Karat4d630552011-05-06 18:35:32 +0530161 s = match_strdup(&args[0]);
162 if (!s) {
163 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
Prem Karat4d630552011-05-06 18:35:32 +0530166 goto free_and_return;
167 }
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
Joe Perches5d385152011-11-28 10:40:46 -0800170 pr_info("Could not find request transport: %s\n",
171 s);
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600172 ret = -EINVAL;
Prem Karat4d630552011-05-06 18:35:32 +0530173 kfree(s);
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600174 goto free_and_return;
175 }
Prem Karat4d630552011-05-06 18:35:32 +0530176 kfree(s);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600177 break;
178 case Opt_legacy:
Sripathi Kodi342fee12010-03-05 18:50:14 +0000179 clnt->proto_version = p9_proto_legacy;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600180 break;
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000181 case Opt_version:
Prem Karat4d630552011-05-06 18:35:32 +0530182 s = match_strdup(&args[0]);
183 if (!s) {
184 ret = -ENOMEM;
Joe Perches5d385152011-11-28 10:40:46 -0800185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000187 goto free_and_return;
Prem Karat4d630552011-05-06 18:35:32 +0530188 }
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
191 kfree(s);
192 goto free_and_return;
193 }
194 kfree(s);
Sripathi Kodi0fb80ab2010-03-05 18:49:11 +0000195 clnt->proto_version = ret;
196 break;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600197 default:
198 continue;
199 }
200 }
Tejun Heo72029fe2008-09-24 16:22:23 -0500201
Eric Van Hensbergen349d3bb82010-01-15 19:01:10 -0600202free_and_return:
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600203 kfree(tmp_options);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600204 return ret;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600205}
206
Rashika05a782d2014-02-09 19:57:33 +0530207static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
Simon Derr53873202013-06-21 15:32:36 +0200208{
209 struct p9_fcall *fc;
210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
211 if (!fc)
212 return NULL;
213 fc->capacity = alloc_msize;
214 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
215 return fc;
216}
217
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500218/**
219 * p9_tag_alloc - lookup/allocate a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
222 *
223 * this is a simple array lookup, but will grow the
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300224 * request_slots as necessary to accommodate transaction
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500225 * ids which did not previously have a slot.
226 *
227 * this code relies on the client spinlock to manage locks, its
228 * possible we should switch to something else, but I'd rather
229 * stick with something low-overhead for the common case.
230 *
231 */
232
Dan Carpenteref6b0802011-08-26 19:57:40 +0300233static struct p9_req_t *
234p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500235{
236 unsigned long flags;
237 int row, col;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500238 struct p9_req_t *req;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530239 int alloc_msize = min(c->msize, max_size);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500240
241 /* This looks up the original request by tag so we know which
242 * buffer to read the data into */
243 tag++;
244
245 if (tag >= c->max_tag) {
246 spin_lock_irqsave(&c->lock, flags);
247 /* check again since original check was outside of lock */
248 while (tag >= c->max_tag) {
249 row = (tag / P9_ROW_MAXTAG);
250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
251 sizeof(struct p9_req_t), GFP_ATOMIC);
252
253 if (!c->reqs[row]) {
Joe Perches5d385152011-11-28 10:40:46 -0800254 pr_err("Couldn't grow tag array\n");
Eric Van Hensbergene45c5402008-10-22 18:54:47 -0500255 spin_unlock_irqrestore(&c->lock, flags);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500256 return ERR_PTR(-ENOMEM);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500257 }
258 for (col = 0; col < P9_ROW_MAXTAG; col++) {
259 c->reqs[row][col].status = REQ_STATUS_IDLE;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500260 c->reqs[row][col].tc = NULL;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500261 }
262 c->max_tag += P9_ROW_MAXTAG;
263 }
264 spin_unlock_irqrestore(&c->lock, flags);
265 }
266 row = tag / P9_ROW_MAXTAG;
267 col = tag % P9_ROW_MAXTAG;
268
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500269 req = &c->reqs[row][col];
Simon Derr53873202013-06-21 15:32:36 +0200270 if (!req->wq) {
Aneesh Kumar K.Veeff66e2011-03-08 16:39:47 +0530271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
Simon Derrea071aa2013-06-21 15:32:34 +0200272 if (!req->wq)
273 goto grow_failed;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500274 init_waitqueue_head(req->wq);
Simon Derrea071aa2013-06-21 15:32:34 +0200275 }
Simon Derrea071aa2013-06-21 15:32:34 +0200276
Simon Derr53873202013-06-21 15:32:36 +0200277 if (!req->tc)
278 req->tc = p9_fcall_alloc(alloc_msize);
279 if (!req->rc)
280 req->rc = p9_fcall_alloc(alloc_msize);
281 if (!req->tc || !req->rc)
282 goto grow_failed;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500283
284 p9pdu_reset(req->tc);
285 p9pdu_reset(req->rc);
286
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500287 req->tc->tag = tag-1;
288 req->status = REQ_STATUS_ALLOC;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500289
Simon Derrea071aa2013-06-21 15:32:34 +0200290 return req;
291
292grow_failed:
293 pr_err("Couldn't grow tag array\n");
294 kfree(req->tc);
295 kfree(req->rc);
296 kfree(req->wq);
297 req->tc = req->rc = NULL;
298 req->wq = NULL;
299 return ERR_PTR(-ENOMEM);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500300}
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500301
302/**
303 * p9_tag_lookup - lookup a request by tag
304 * @c: client session to lookup tag within
305 * @tag: numeric id for transaction
306 *
307 */
308
309struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
310{
311 int row, col;
312
313 /* This looks up the original request by tag so we know which
314 * buffer to read the data into */
315 tag++;
316
Eric Van Hensbergenb85f7d922011-07-13 19:12:18 -0500317 if(tag >= c->max_tag)
318 return NULL;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500319
320 row = tag / P9_ROW_MAXTAG;
321 col = tag % P9_ROW_MAXTAG;
322
323 return &c->reqs[row][col];
324}
325EXPORT_SYMBOL(p9_tag_lookup);
326
327/**
328 * p9_tag_init - setup tags structure and contents
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600329 * @c: v9fs client struct
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500330 *
331 * This initializes the tags structure for each client instance.
332 *
333 */
334
335static int p9_tag_init(struct p9_client *c)
336{
337 int err = 0;
338
339 c->tagpool = p9_idpool_create();
340 if (IS_ERR(c->tagpool)) {
341 err = PTR_ERR(c->tagpool);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500342 goto error;
343 }
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +0000344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
345 if (err < 0) {
346 p9_idpool_destroy(c->tagpool);
347 goto error;
348 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500349 c->max_tag = 0;
350error:
351 return err;
352}
353
354/**
355 * p9_tag_cleanup - cleans up tags structure and reclaims resources
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600356 * @c: v9fs client struct
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500357 *
358 * This frees resources associated with the tags structure
359 *
360 */
361static void p9_tag_cleanup(struct p9_client *c)
362{
363 int row, col;
364
365 /* check to insure all requests are idle */
366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
367 for (col = 0; col < P9_ROW_MAXTAG; col++) {
368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
Joe Perches5d385152011-11-28 10:40:46 -0800369 p9_debug(P9_DEBUG_MUX,
370 "Attempting to cleanup non-free tag %d,%d\n",
371 row, col);
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500372 /* TODO: delay execution of cleanup */
373 return;
374 }
375 }
376 }
377
Latchesar Ionkov62b2be52010-08-24 18:13:59 +0000378 if (c->tagpool) {
379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500380 p9_idpool_destroy(c->tagpool);
Latchesar Ionkov62b2be52010-08-24 18:13:59 +0000381 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500382
383 /* free requests associated with tags */
384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500385 for (col = 0; col < P9_ROW_MAXTAG; col++) {
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500386 kfree(c->reqs[row][col].wq);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500387 kfree(c->reqs[row][col].tc);
388 kfree(c->reqs[row][col].rc);
389 }
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -0500390 kfree(c->reqs[row]);
391 }
392 c->max_tag = 0;
393}
394
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500395/**
396 * p9_free_req - free a request and clean-up as necessary
397 * c: client state
398 * r: request to release
399 *
400 */
401
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500402static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500403{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500404 int tag = r->tc->tag;
Joe Perches5d385152011-11-28 10:40:46 -0800405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500406
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500407 r->status = REQ_STATUS_IDLE;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
409 p9_idpool_put(tag, c->tagpool);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500410}
411
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500412/**
413 * p9_client_cb - call back from transport to client
414 * c: client state
415 * req: request received
416 *
417 */
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100418void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500419{
Joe Perches5d385152011-11-28 10:40:46 -0800420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100421
422 /*
423 * This barrier is needed to make sure any change made to req before
424 * the other thread wakes up will indeed be seen by the waiting side.
425 */
426 smp_wmb();
427 req->status = status;
428
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500429 wake_up(req->wq);
Joe Perches5d385152011-11-28 10:40:46 -0800430 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500431}
432EXPORT_SYMBOL(p9_client_cb);
433
434/**
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500435 * p9_parse_header - parse header arguments out of a packet
436 * @pdu: packet to parse
437 * @size: size of packet
438 * @type: type of request
439 * @tag: tag of packet
440 * @rewind: set if we need to rewind offset afterwards
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500441 */
442
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500443int
444p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
445 int rewind)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500446{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500447 int8_t r_type;
448 int16_t r_tag;
449 int32_t r_size;
450 int offset = pdu->offset;
451 int err;
452
453 pdu->offset = 0;
454 if (pdu->size == 0)
455 pdu->size = 7;
456
457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
458 if (err)
459 goto rewind_and_exit;
460
461 pdu->size = r_size;
462 pdu->id = r_type;
463 pdu->tag = r_tag;
464
Joe Perches5d385152011-11-28 10:40:46 -0800465 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
466 pdu->size, pdu->id, pdu->tag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500467
468 if (type)
469 *type = r_type;
470 if (tag)
471 *tag = r_tag;
472 if (size)
473 *size = r_size;
474
475
476rewind_and_exit:
477 if (rewind)
478 pdu->offset = offset;
479 return err;
480}
481EXPORT_SYMBOL(p9_parse_header);
482
483/**
484 * p9_check_errors - check 9p packet for error return and process it
485 * @c: current client instance
486 * @req: request to parse and check for error conditions
487 *
488 * returns error code if one is discovered, otherwise returns 0
489 *
490 * this will have to be more complicated if we have multiple
491 * error packet types
492 */
493
494static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
495{
496 int8_t type;
497 int err;
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800498 int ecode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500499
500 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530501 /*
502 * dump the response from server
503 * This should be after check errors which poplulate pdu_fcall.
504 */
505 trace_9p_protocol_dump(c, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500506 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800507 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500508 return err;
509 }
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800510 if (type != P9_RERROR && type != P9_RLERROR)
511 return 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500512
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800513 if (!p9_is_proto_dotl(c)) {
514 char *ename;
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800515 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530516 &ename, &ecode);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800517 if (err)
518 goto out_err;
519
520 if (p9_is_proto_dotu(c))
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500521 err = -ecode;
522
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800523 if (!err || !IS_ERR_VALUE(err)) {
524 err = p9_errstr2errno(ename, strlen(ename));
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500525
Joe Perches5d385152011-11-28 10:40:46 -0800526 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
527 -ecode, ename);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800528 }
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530529 kfree(ename);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800530 } else {
531 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
532 err = -ecode;
533
Joe Perches5d385152011-11-28 10:40:46 -0800534 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
Venkateswararao Jujjuri (JV)ca41bb32011-02-01 20:04:59 -0800535 }
536
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500537 return err;
Arun R Bharadwaj4f7ebe82010-07-28 14:17:26 +0530538
539out_err:
Joe Perches5d385152011-11-28 10:40:46 -0800540 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
Arun R Bharadwaj4f7ebe82010-07-28 14:17:26 +0530541
542 return err;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500543}
544
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530545/**
546 * p9_check_zc_errors - check 9p packet for error return and process it
547 * @c: current client instance
548 * @req: request to parse and check for error conditions
549 * @in_hdrlen: Size of response protocol buffer.
550 *
551 * returns error code if one is discovered, otherwise returns 0
552 *
553 * this will have to be more complicated if we have multiple
554 * error packet types
555 */
556
557static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
558 char *uidata, int in_hdrlen, int kern_buf)
559{
560 int err;
561 int ecode;
562 int8_t type;
563 char *ename = NULL;
564
565 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530566 /*
567 * dump the response from server
568 * This should be after parse_header which poplulate pdu_fcall.
569 */
570 trace_9p_protocol_dump(c, req->rc);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530571 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800572 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530573 return err;
574 }
575
576 if (type != P9_RERROR && type != P9_RLERROR)
577 return 0;
578
579 if (!p9_is_proto_dotl(c)) {
580 /* Error is reported in string format */
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530581 int len;
582 /* 7 = header size for RERROR; */
583 int inline_len = in_hdrlen - 7;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530584
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530585 len = req->rc->size - req->rc->offset;
586 if (len > (P9_ZC_HDR_SZ - 7)) {
587 err = -EFAULT;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530588 goto out_err;
589 }
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530590
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530591 ename = &req->rc->sdata[req->rc->offset];
592 if (len > inline_len) {
593 /* We have error in external buffer */
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530594 if (kern_buf) {
595 memcpy(ename + inline_len, uidata,
596 len - inline_len);
597 } else {
598 err = copy_from_user(ename + inline_len,
599 uidata, len - inline_len);
600 if (err) {
601 err = -EFAULT;
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530602 goto out_err;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530603 }
604 }
605 }
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530606 ename = NULL;
607 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
608 &ename, &ecode);
609 if (err)
610 goto out_err;
611
612 if (p9_is_proto_dotu(c))
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530613 err = -ecode;
Aneesh Kumar K.V42fe6482013-05-20 23:05:15 +0530614
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530615 if (!err || !IS_ERR_VALUE(err)) {
616 err = p9_errstr2errno(ename, strlen(ename));
617
Joe Perches5d385152011-11-28 10:40:46 -0800618 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
619 -ecode, ename);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530620 }
621 kfree(ename);
622 } else {
623 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
624 err = -ecode;
625
Joe Perches5d385152011-11-28 10:40:46 -0800626 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530627 }
628 return err;
629
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530630out_err:
Joe Perches5d385152011-11-28 10:40:46 -0800631 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530632 return err;
633}
634
Rob Landleyaca00762011-05-08 18:46:38 +0000635static struct p9_req_t *
636p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
637
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500638/**
639 * p9_client_flush - flush (cancel) a request
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600640 * @c: client state
641 * @oldreq: request to cancel
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500642 *
Rob Landleyaca00762011-05-08 18:46:38 +0000643 * This sents a flush for a particular request and links
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500644 * the flush request to the original request. The current
645 * code only supports a single flush request although the protocol
646 * allows for multiple flush requests to be sent for a single request.
647 *
648 */
649
650static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
651{
652 struct p9_req_t *req;
653 int16_t oldtag;
654 int err;
655
656 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
657 if (err)
658 return err;
659
Joe Perches5d385152011-11-28 10:40:46 -0800660 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500661
662 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
663 if (IS_ERR(req))
664 return PTR_ERR(req);
665
Simon Derr1cff3302013-06-21 15:32:42 +0200666 /*
667 * if we haven't received a response for oldreq,
Andi Shyti60ff7792013-07-25 10:54:24 +0200668 * remove it from the list
Simon Derr1cff3302013-06-21 15:32:42 +0200669 */
Simon Derr0bfd6842014-03-10 16:38:52 +0100670 if (oldreq->status == REQ_STATUS_SENT)
Simon Derrafd8d652014-03-10 16:38:49 +0100671 if (c->trans_mod->cancelled)
672 c->trans_mod->cancelled(c, oldreq);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500673
674 p9_free_req(c, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500675 return 0;
676}
677
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530678static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
679 int8_t type, int req_size,
680 const char *fmt, va_list ap)
681{
682 int tag, err;
683 struct p9_req_t *req;
684
Joe Perches5d385152011-11-28 10:40:46 -0800685 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530686
687 /* we allow for any status other than disconnected */
688 if (c->status == Disconnected)
689 return ERR_PTR(-EIO);
690
691 /* if status is begin_disconnected we allow only clunk request */
692 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
693 return ERR_PTR(-EIO);
694
695 tag = P9_NOTAG;
696 if (type != P9_TVERSION) {
697 tag = p9_idpool_get(c->tagpool);
698 if (tag < 0)
699 return ERR_PTR(-ENOMEM);
700 }
701
702 req = p9_tag_alloc(c, tag, req_size);
703 if (IS_ERR(req))
704 return req;
705
706 /* marshall the data */
707 p9pdu_prepare(req->tc, tag, type);
708 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
709 if (err)
710 goto reterr;
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530711 p9pdu_finalize(c, req->tc);
712 trace_9p_client_req(c, type, tag);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530713 return req;
714reterr:
715 p9_free_req(c, req);
716 return ERR_PTR(err);
717}
718
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500719/**
720 * p9_client_rpc - issue a request and wait for a response
721 * @c: client session
722 * @type: type of request
723 * @fmt: protocol format string (see protocol.c)
724 *
725 * Returns request structure (which client must free using p9_free_req)
726 */
727
728static struct p9_req_t *
729p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
730{
731 va_list ap;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530732 int sigpending, err;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500733 unsigned long flags;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530734 struct p9_req_t *req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500735
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530736 va_start(ap, fmt);
737 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
738 va_end(ap);
739 if (IS_ERR(req))
740 return req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500741
742 if (signal_pending(current)) {
743 sigpending = 1;
744 clear_thread_flag(TIF_SIGPENDING);
745 } else
746 sigpending = 0;
747
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500748 err = c->trans_mod->request(c, req);
749 if (err < 0) {
M. Mohan Kumar3cd79672011-04-15 13:59:33 +0530750 if (err != -ERESTARTSYS && err != -EFAULT)
Venkateswararao Jujjuri (JV)52f44e02010-09-29 18:33:41 -0700751 c->status = Disconnected;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500752 goto reterr;
753 }
Jim Garlicka314f272012-02-01 12:48:53 -0800754again:
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530755 /* Wait for the response */
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500756 err = wait_event_interruptible(*req->wq,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530757 req->status >= REQ_STATUS_RCVD);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500758
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100759 /*
760 * Make sure our req is coherent with regard to updates in other
761 * threads - echoes to wmb() in the callback
762 */
763 smp_rmb();
764
Jim Garlicka314f272012-02-01 12:48:53 -0800765 if ((err == -ERESTARTSYS) && (c->status == Connected)
766 && (type == P9_TFLUSH)) {
767 sigpending = 1;
768 clear_thread_flag(TIF_SIGPENDING);
769 goto again;
770 }
771
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500772 if (req->status == REQ_STATUS_ERROR) {
Joe Perches5d385152011-11-28 10:40:46 -0800773 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500774 err = req->t_err;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500775 }
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500776 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
Joe Perches5d385152011-11-28 10:40:46 -0800777 p9_debug(P9_DEBUG_MUX, "flushing\n");
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500778 sigpending = 1;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500779 clear_thread_flag(TIF_SIGPENDING);
780
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500781 if (c->trans_mod->cancel(c, req))
782 p9_client_flush(c, req);
783
784 /* if we received the response anyway, don't signal error */
785 if (req->status == REQ_STATUS_RCVD)
786 err = 0;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500787 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500788 if (sigpending) {
789 spin_lock_irqsave(&current->sighand->siglock, flags);
790 recalc_sigpending();
791 spin_unlock_irqrestore(&current->sighand->siglock, flags);
792 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500793 if (err < 0)
794 goto reterr;
795
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500796 err = p9_check_errors(c, req);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530797 trace_9p_client_res(c, type, req->rc->tag, err);
798 if (!err)
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500799 return req;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530800reterr:
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530801 p9_free_req(c, req);
Simon Derr43def352012-08-10 15:52:06 +0200802 return ERR_PTR(safe_errno(err));
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530803}
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500804
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530805/**
806 * p9_client_zc_rpc - issue a request and wait for a response
807 * @c: client session
808 * @type: type of request
809 * @uidata: user bffer that should be ued for zero copy read
810 * @uodata: user buffer that shoud be user for zero copy write
811 * @inlen: read buffer size
812 * @olen: write buffer size
813 * @hdrlen: reader header size, This is the size of response protocol data
814 * @fmt: protocol format string (see protocol.c)
815 *
816 * Returns request structure (which client must free using p9_free_req)
817 */
818static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
819 char *uidata, char *uodata,
820 int inlen, int olen, int in_hdrlen,
821 int kern_buf, const char *fmt, ...)
822{
823 va_list ap;
824 int sigpending, err;
825 unsigned long flags;
826 struct p9_req_t *req;
827
828 va_start(ap, fmt);
829 /*
830 * We allocate a inline protocol data of only 4k bytes.
831 * The actual content is passed in zero-copy fashion.
832 */
833 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
834 va_end(ap);
835 if (IS_ERR(req))
836 return req;
837
838 if (signal_pending(current)) {
839 sigpending = 1;
840 clear_thread_flag(TIF_SIGPENDING);
841 } else
842 sigpending = 0;
843
844 /* If we are called with KERNEL_DS force kern_buf */
845 if (segment_eq(get_fs(), KERNEL_DS))
846 kern_buf = 1;
847
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen, kern_buf);
850 if (err < 0) {
851 if (err == -EIO)
852 c->status = Disconnected;
853 goto reterr;
854 }
855 if (req->status == REQ_STATUS_ERROR) {
Joe Perches5d385152011-11-28 10:40:46 -0800856 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530857 err = req->t_err;
858 }
859 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
Joe Perches5d385152011-11-28 10:40:46 -0800860 p9_debug(P9_DEBUG_MUX, "flushing\n");
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530861 sigpending = 1;
862 clear_thread_flag(TIF_SIGPENDING);
863
864 if (c->trans_mod->cancel(c, req))
865 p9_client_flush(c, req);
866
867 /* if we received the response anyway, don't signal error */
868 if (req->status == REQ_STATUS_RCVD)
869 err = 0;
870 }
871 if (sigpending) {
872 spin_lock_irqsave(&current->sighand->siglock, flags);
873 recalc_sigpending();
874 spin_unlock_irqrestore(&current->sighand->siglock, flags);
875 }
876 if (err < 0)
877 goto reterr;
878
879 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530880 trace_9p_client_res(c, type, req->rc->tag, err);
881 if (!err)
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +0530882 return req;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500883reterr:
884 p9_free_req(c, req);
Simon Derr43def352012-08-10 15:52:06 +0200885 return ERR_PTR(safe_errno(err));
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500886}
887
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500888static struct p9_fid *p9_fid_create(struct p9_client *clnt)
889{
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500890 int ret;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500891 struct p9_fid *fid;
Tom Tuckercac23d62008-10-23 16:31:02 -0500892 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500893
Joe Perches5d385152011-11-28 10:40:46 -0800894 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500895 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
896 if (!fid)
897 return ERR_PTR(-ENOMEM);
898
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500899 ret = p9_idpool_get(clnt->fidpool);
Roel Kluin24e94de2009-01-18 21:32:11 -0800900 if (ret < 0) {
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500901 ret = -ENOSPC;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500902 goto error;
903 }
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500904 fid->fid = ret;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500905
906 memset(&fid->qid, 0, sizeof(struct p9_qid));
907 fid->mode = -1;
David Howellsf8b9d532008-11-14 10:38:44 +1100908 fid->uid = current_fsuid();
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500909 fid->clnt = clnt;
Eric Van Hensbergen3e2796a2009-11-02 08:39:28 -0600910 fid->rdir = NULL;
Tom Tuckercac23d62008-10-23 16:31:02 -0500911 spin_lock_irqsave(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500912 list_add(&fid->flist, &clnt->fidlist);
Tom Tuckercac23d62008-10-23 16:31:02 -0500913 spin_unlock_irqrestore(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500914
915 return fid;
916
917error:
918 kfree(fid);
Roel Kluin9f3e9bb2008-10-28 14:22:43 -0500919 return ERR_PTR(ret);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500920}
921
922static void p9_fid_destroy(struct p9_fid *fid)
923{
924 struct p9_client *clnt;
Tom Tuckercac23d62008-10-23 16:31:02 -0500925 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500926
Joe Perches5d385152011-11-28 10:40:46 -0800927 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500928 clnt = fid->clnt;
929 p9_idpool_put(fid->fid, clnt->fidpool);
Tom Tuckercac23d62008-10-23 16:31:02 -0500930 spin_lock_irqsave(&clnt->lock, flags);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500931 list_del(&fid->flist);
Tom Tuckercac23d62008-10-23 16:31:02 -0500932 spin_unlock_irqrestore(&clnt->lock, flags);
Eric Van Hensbergen3e2796a2009-11-02 08:39:28 -0600933 kfree(fid->rdir);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500934 kfree(fid);
935}
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600936
stephen hemminger32a875a2010-10-19 06:48:16 +0000937static int p9_client_version(struct p9_client *c)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500938{
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500939 int err = 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500940 struct p9_req_t *req;
941 char *version;
942 int msize;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500943
Joe Perches5d385152011-11-28 10:40:46 -0800944 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
945 c->msize, c->proto_version);
Sripathi Kodic5a76972010-03-05 18:51:04 +0000946
947 switch (c->proto_version) {
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000948 case p9_proto_2000L:
Sripathi Kodic5a76972010-03-05 18:51:04 +0000949 req = p9_client_rpc(c, P9_TVERSION, "ds",
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000950 c->msize, "9P2000.L");
Sripathi Kodic5a76972010-03-05 18:51:04 +0000951 break;
952 case p9_proto_2000u:
953 req = p9_client_rpc(c, P9_TVERSION, "ds",
954 c->msize, "9P2000.u");
955 break;
956 case p9_proto_legacy:
957 req = p9_client_rpc(c, P9_TVERSION, "ds",
958 c->msize, "9P2000");
959 break;
960 default:
961 return -EINVAL;
Sripathi Kodic5a76972010-03-05 18:51:04 +0000962 }
963
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500964 if (IS_ERR(req))
965 return PTR_ERR(req);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500966
Sripathi Kodi342fee12010-03-05 18:50:14 +0000967 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500968 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800969 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +0530970 trace_9p_protocol_dump(c, req->rc);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500971 goto error;
972 }
973
Joe Perches5d385152011-11-28 10:40:46 -0800974 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
Sripathi Kodi45bc21e2010-03-08 17:33:04 +0000975 if (!strncmp(version, "9P2000.L", 8))
976 c->proto_version = p9_proto_2000L;
Sripathi Kodic5a76972010-03-05 18:51:04 +0000977 else if (!strncmp(version, "9P2000.u", 8))
Sripathi Kodi342fee12010-03-05 18:50:14 +0000978 c->proto_version = p9_proto_2000u;
979 else if (!strncmp(version, "9P2000", 6))
980 c->proto_version = p9_proto_legacy;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500981 else {
982 err = -EREMOTEIO;
983 goto error;
984 }
985
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500986 if (msize < c->msize)
987 c->msize = msize;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500988
989error:
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500990 kfree(version);
991 p9_free_req(c, req);
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500992
993 return err;
994}
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -0500995
996struct p9_client *p9_client_create(const char *dev_name, char *options)
997{
998 int err;
999 struct p9_client *clnt;
Will Deacon50192ab2013-08-21 18:24:47 +01001000 char *client_id;
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -05001001
1002 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001003 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1004 if (!clnt)
1005 return ERR_PTR(-ENOMEM);
1006
Tejun Heo72029fe2008-09-24 16:22:23 -05001007 clnt->trans_mod = NULL;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001008 clnt->trans = NULL;
Will Deacon50192ab2013-08-21 18:24:47 +01001009
1010 client_id = utsname()->nodename;
1011 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1012
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001013 spin_lock_init(&clnt->lock);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001014 INIT_LIST_HEAD(&clnt->fidlist);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001015
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001016 err = p9_tag_init(clnt);
1017 if (err < 0)
1018 goto free_client;
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -05001019
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001020 err = parse_opts(options, clnt);
1021 if (err < 0)
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001022 goto destroy_tagpool;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -06001023
Abhishek Kulkarnia17d1722009-07-14 13:24:10 -05001024 if (!clnt->trans_mod)
1025 clnt->trans_mod = v9fs_get_default_trans();
1026
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001027 if (clnt->trans_mod == NULL) {
1028 err = -EPROTONOSUPPORT;
Joe Perches5d385152011-11-28 10:40:46 -08001029 p9_debug(P9_DEBUG_ERROR,
1030 "No transport defined or default transport\n");
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001031 goto destroy_tagpool;
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001032 }
1033
1034 clnt->fidpool = p9_idpool_create();
1035 if (IS_ERR(clnt->fidpool)) {
1036 err = PTR_ERR(clnt->fidpool);
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001037 goto put_trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001038 }
1039
Joe Perches5d385152011-11-28 10:40:46 -08001040 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1041 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001042
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001043 err = clnt->trans_mod->create(clnt, dev_name, options);
1044 if (err)
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001045 goto destroy_fidpool;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001046
Venkateswararao Jujjuri (JV)c9ffb052011-06-29 18:06:33 -07001047 if (clnt->msize > clnt->trans_mod->maxsize)
1048 clnt->msize = clnt->trans_mod->maxsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001049
Eric Van Hensbergen6936bf62008-10-13 20:36:14 -05001050 err = p9_client_version(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001051 if (err)
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001052 goto close_trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001053
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001054 return clnt;
1055
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001056close_trans:
1057 clnt->trans_mod->close(clnt);
1058destroy_fidpool:
1059 p9_idpool_destroy(clnt->fidpool);
1060put_trans:
1061 v9fs_put_trans(clnt->trans_mod);
Aneesh Kumar K.Vfe1cbab2011-05-20 18:55:52 +00001062destroy_tagpool:
1063 p9_idpool_destroy(clnt->tagpool);
Eric Van Hensbergen8781ff92010-02-08 18:18:34 -06001064free_client:
1065 kfree(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001066 return ERR_PTR(err);
1067}
1068EXPORT_SYMBOL(p9_client_create);
1069
1070void p9_client_destroy(struct p9_client *clnt)
1071{
1072 struct p9_fid *fid, *fidptr;
1073
Joe Perches5d385152011-11-28 10:40:46 -08001074 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001075
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001076 if (clnt->trans_mod)
1077 clnt->trans_mod->close(clnt);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001078
Tejun Heo72029fe2008-09-24 16:22:23 -05001079 v9fs_put_trans(clnt->trans_mod);
1080
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001081 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
Joe Perches5d385152011-11-28 10:40:46 -08001082 pr_info("Found fid %d not clunked\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001083 p9_fid_destroy(fid);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001084 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001085
Eric Van Hensbergen0af88872007-07-13 16:47:58 -05001086 if (clnt->fidpool)
1087 p9_idpool_destroy(clnt->fidpool);
1088
Eric Van Hensbergenfea511a2008-10-13 18:45:23 -05001089 p9_tag_cleanup(clnt);
1090
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001091 kfree(clnt);
1092}
1093EXPORT_SYMBOL(p9_client_destroy);
1094
1095void p9_client_disconnect(struct p9_client *clnt)
1096{
Joe Perches5d385152011-11-28 10:40:46 -08001097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001098 clnt->status = Disconnected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001099}
1100EXPORT_SYMBOL(p9_client_disconnect);
1101
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001102void p9_client_begin_disconnect(struct p9_client *clnt)
1103{
Joe Perches5d385152011-11-28 10:40:46 -08001104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -05001105 clnt->status = BeginDisconnect;
1106}
1107EXPORT_SYMBOL(p9_client_begin_disconnect);
1108
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001109struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001110 char *uname, kuid_t n_uname, char *aname)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001111{
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301112 int err = 0;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001113 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001114 struct p9_fid *fid;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001115 struct p9_qid qid;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001116
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001117
Joe Perches5d385152011-11-28 10:40:46 -08001118 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1119 afid ? afid->fid : -1, uname, aname);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001120 fid = p9_fid_create(clnt);
1121 if (IS_ERR(fid)) {
1122 err = PTR_ERR(fid);
1123 fid = NULL;
1124 goto error;
1125 }
1126
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001127 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001128 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1129 if (IS_ERR(req)) {
1130 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001131 goto error;
1132 }
1133
Sripathi Kodi342fee12010-03-05 18:50:14 +00001134 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001135 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301136 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001137 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001138 goto error;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001139 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001140
Joe Perches5d385152011-11-28 10:40:46 -08001141 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1142 qid.type, (unsigned long long)qid.path, qid.version);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001143
1144 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1145
1146 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001147 return fid;
1148
1149error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001150 if (fid)
1151 p9_fid_destroy(fid);
1152 return ERR_PTR(err);
1153}
1154EXPORT_SYMBOL(p9_client_attach);
1155
Harsh Prateek Borab76225e2011-03-31 15:49:39 +05301156struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1157 char **wnames, int clone)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001158{
1159 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001160 struct p9_client *clnt;
1161 struct p9_fid *fid;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001162 struct p9_qid *wqids;
1163 struct p9_req_t *req;
Harsh Prateek Borab76225e2011-03-31 15:49:39 +05301164 uint16_t nwqids, count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001165
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001166 err = 0;
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001167 wqids = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001168 clnt = oldfid->clnt;
1169 if (clone) {
1170 fid = p9_fid_create(clnt);
1171 if (IS_ERR(fid)) {
1172 err = PTR_ERR(fid);
1173 fid = NULL;
1174 goto error;
1175 }
1176
1177 fid->uid = oldfid->uid;
1178 } else
1179 fid = oldfid;
1180
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001181
Joe Perches5d385152011-11-28 10:40:46 -08001182 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1183 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001184
1185 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1186 nwname, wnames);
1187 if (IS_ERR(req)) {
1188 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001189 goto error;
1190 }
1191
Sripathi Kodi342fee12010-03-05 18:50:14 +00001192 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001193 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301194 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001195 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001196 goto clunk_fid;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001197 }
1198 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001199
Joe Perches5d385152011-11-28 10:40:46 -08001200 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001201
1202 if (nwqids != nwname) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001203 err = -ENOENT;
1204 goto clunk_fid;
1205 }
1206
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001207 for (count = 0; count < nwqids; count++)
Joe Perches5d385152011-11-28 10:40:46 -08001208 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001209 count, wqids[count].type,
1210 (unsigned long long)wqids[count].path,
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001211 wqids[count].version);
1212
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001213 if (nwname)
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001214 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001215 else
1216 fid->qid = oldfid->qid;
1217
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001218 kfree(wqids);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001219 return fid;
1220
1221clunk_fid:
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001222 kfree(wqids);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001223 p9_client_clunk(fid);
1224 fid = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001225
1226error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001227 if (fid && (fid != oldfid))
1228 p9_fid_destroy(fid);
1229
1230 return ERR_PTR(err);
1231}
1232EXPORT_SYMBOL(p9_client_walk);
1233
1234int p9_client_open(struct p9_fid *fid, int mode)
1235{
1236 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001237 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001238 struct p9_req_t *req;
1239 struct p9_qid qid;
1240 int iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001241
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001242 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08001243 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
M. Mohan Kumaref565472010-06-22 19:47:50 +05301244 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1245 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001246
1247 if (fid->mode != -1)
1248 return -EINVAL;
1249
M. Mohan Kumaref565472010-06-22 19:47:50 +05301250 if (p9_is_proto_dotl(clnt))
1251 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1252 else
1253 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001254 if (IS_ERR(req)) {
1255 err = PTR_ERR(req);
1256 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001257 }
1258
Sripathi Kodi342fee12010-03-05 18:50:14 +00001259 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001260 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301261 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001262 goto free_and_error;
1263 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001264
Joe Perches5d385152011-11-28 10:40:46 -08001265 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
M. Mohan Kumaref565472010-06-22 19:47:50 +05301266 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1267 (unsigned long long)qid.path, qid.version, iounit);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001268
1269 fid->mode = mode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001270 fid->iounit = iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001271
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001272free_and_error:
1273 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001274error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001275 return err;
1276}
1277EXPORT_SYMBOL(p9_client_open);
1278
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001279int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001280 kgid_t gid, struct p9_qid *qid)
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001281{
1282 int err = 0;
1283 struct p9_client *clnt;
1284 struct p9_req_t *req;
1285 int iounit;
1286
Joe Perches5d385152011-11-28 10:40:46 -08001287 p9_debug(P9_DEBUG_9P,
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001288 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001289 ofid->fid, name, flags, mode,
1290 from_kgid(&init_user_ns, gid));
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001291 clnt = ofid->clnt;
1292
1293 if (ofid->mode != -1)
1294 return -EINVAL;
1295
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001296 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001297 mode, gid);
1298 if (IS_ERR(req)) {
1299 err = PTR_ERR(req);
1300 goto error;
1301 }
1302
1303 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1304 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301305 trace_9p_protocol_dump(clnt, req->rc);
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001306 goto free_and_error;
1307 }
1308
Joe Perches5d385152011-11-28 10:40:46 -08001309 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
Venkateswararao Jujjuri (JV)56431352010-06-17 18:27:46 -07001310 qid->type,
1311 (unsigned long long)qid->path,
1312 qid->version, iounit);
1313
1314 ofid->mode = mode;
1315 ofid->iounit = iounit;
1316
1317free_and_error:
1318 p9_free_req(clnt, req);
1319error:
1320 return err;
1321}
1322EXPORT_SYMBOL(p9_client_create_dotl);
1323
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001324int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1325 char *extension)
1326{
1327 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001328 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001329 struct p9_req_t *req;
1330 struct p9_qid qid;
1331 int iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001332
Joe Perches5d385152011-11-28 10:40:46 -08001333 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001334 fid->fid, name, perm, mode);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001335 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001336 clnt = fid->clnt;
1337
1338 if (fid->mode != -1)
1339 return -EINVAL;
1340
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001341 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1342 mode, extension);
1343 if (IS_ERR(req)) {
1344 err = PTR_ERR(req);
1345 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001346 }
1347
Sripathi Kodi342fee12010-03-05 18:50:14 +00001348 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001349 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301350 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001351 goto free_and_error;
1352 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001353
Joe Perches5d385152011-11-28 10:40:46 -08001354 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001355 qid.type,
1356 (unsigned long long)qid.path,
1357 qid.version, iounit);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001358
1359 fid->mode = mode;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001360 fid->iounit = iounit;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001361
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001362free_and_error:
1363 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001364error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001365 return err;
1366}
1367EXPORT_SYMBOL(p9_client_fcreate);
1368
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001369int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001370 struct p9_qid *qid)
1371{
1372 int err = 0;
1373 struct p9_client *clnt;
1374 struct p9_req_t *req;
1375
Joe Perches5d385152011-11-28 10:40:46 -08001376 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001377 dfid->fid, name, symtgt);
1378 clnt = dfid->clnt;
1379
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08001380 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001381 gid);
1382 if (IS_ERR(req)) {
1383 err = PTR_ERR(req);
1384 goto error;
1385 }
1386
1387 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1388 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301389 trace_9p_protocol_dump(clnt, req->rc);
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001390 goto free_and_error;
1391 }
1392
Joe Perches5d385152011-11-28 10:40:46 -08001393 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001394 qid->type, (unsigned long long)qid->path, qid->version);
1395
1396free_and_error:
1397 p9_free_req(clnt, req);
1398error:
1399 return err;
1400}
1401EXPORT_SYMBOL(p9_client_symlink);
1402
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001403int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1404{
1405 struct p9_client *clnt;
1406 struct p9_req_t *req;
1407
Joe Perches5d385152011-11-28 10:40:46 -08001408 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001409 dfid->fid, oldfid->fid, newname);
1410 clnt = dfid->clnt;
1411 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1412 newname);
1413 if (IS_ERR(req))
1414 return PTR_ERR(req);
1415
Joe Perches5d385152011-11-28 10:40:46 -08001416 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
Venkateswararao Jujjuri (JV)652df9a2010-06-03 15:16:59 -07001417 p9_free_req(clnt, req);
1418 return 0;
1419}
1420EXPORT_SYMBOL(p9_client_link);
1421
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001422int p9_client_fsync(struct p9_fid *fid, int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001423{
1424 int err;
1425 struct p9_client *clnt;
1426 struct p9_req_t *req;
1427
Joe Perches5d385152011-11-28 10:40:46 -08001428 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001429 fid->fid, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001430 err = 0;
1431 clnt = fid->clnt;
1432
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -07001433 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001434 if (IS_ERR(req)) {
1435 err = PTR_ERR(req);
1436 goto error;
1437 }
1438
Joe Perches5d385152011-11-28 10:40:46 -08001439 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -07001440
1441 p9_free_req(clnt, req);
1442
1443error:
1444 return err;
1445}
1446EXPORT_SYMBOL(p9_client_fsync);
1447
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001448int p9_client_clunk(struct p9_fid *fid)
1449{
1450 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001451 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001452 struct p9_req_t *req;
Jim Garlick208f3c22012-02-26 14:49:57 -06001453 int retries = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001454
jvrao8e44a082010-08-25 16:27:06 +00001455 if (!fid) {
Joe Perches5d385152011-11-28 10:40:46 -08001456 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1457 __func__, task_pid_nr(current));
jvrao8e44a082010-08-25 16:27:06 +00001458 dump_stack();
1459 return 0;
1460 }
1461
Jim Garlick208f3c22012-02-26 14:49:57 -06001462again:
1463 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1464 retries);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001465 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001466 clnt = fid->clnt;
1467
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001468 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1469 if (IS_ERR(req)) {
1470 err = PTR_ERR(req);
1471 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001472 }
1473
Joe Perches5d385152011-11-28 10:40:46 -08001474 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001475
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001476 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001477error:
Aneesh Kumar K.V50349902011-07-11 16:40:58 +00001478 /*
1479 * Fid is not valid even after a failed clunk
Jim Garlick208f3c22012-02-26 14:49:57 -06001480 * If interrupted, retry once then give up and
1481 * leak fid until umount.
Aneesh Kumar K.V50349902011-07-11 16:40:58 +00001482 */
Jim Garlick208f3c22012-02-26 14:49:57 -06001483 if (err == -ERESTARTSYS) {
1484 if (retries++ == 0)
1485 goto again;
1486 } else
1487 p9_fid_destroy(fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001488 return err;
1489}
1490EXPORT_SYMBOL(p9_client_clunk);
1491
1492int p9_client_remove(struct p9_fid *fid)
1493{
1494 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001495 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001496 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001497
Joe Perches5d385152011-11-28 10:40:46 -08001498 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001499 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001500 clnt = fid->clnt;
1501
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001502 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1503 if (IS_ERR(req)) {
1504 err = PTR_ERR(req);
1505 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001506 }
1507
Joe Perches5d385152011-11-28 10:40:46 -08001508 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001509
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001510 p9_free_req(clnt, req);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001511error:
Jim Garlick208f3c22012-02-26 14:49:57 -06001512 if (err == -ERESTARTSYS)
1513 p9_client_clunk(fid);
1514 else
1515 p9_fid_destroy(fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001516 return err;
1517}
1518EXPORT_SYMBOL(p9_client_remove);
1519
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301520int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1521{
1522 int err = 0;
1523 struct p9_req_t *req;
1524 struct p9_client *clnt;
1525
Joe Perches5d385152011-11-28 10:40:46 -08001526 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301527 dfid->fid, name, flags);
1528
1529 clnt = dfid->clnt;
1530 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1531 if (IS_ERR(req)) {
1532 err = PTR_ERR(req);
1533 goto error;
1534 }
Joe Perches5d385152011-11-28 10:40:46 -08001535 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +05301536
1537 p9_free_req(clnt, req);
1538error:
1539 return err;
1540}
1541EXPORT_SYMBOL(p9_client_unlinkat);
1542
Eric Van Hensbergen0fc96552008-10-13 20:36:17 -05001543int
1544p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1545 u32 count)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001546{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001547 char *dataptr;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301548 int kernel_buf = 0;
1549 struct p9_req_t *req;
1550 struct p9_client *clnt;
1551 int err, rsize, non_zc = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001552
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301553
Joe Perches5d385152011-11-28 10:40:46 -08001554 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +00001555 fid->fid, (unsigned long long) offset, count);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001556 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001557 clnt = fid->clnt;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001558
1559 rsize = fid->iounit;
1560 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1561 rsize = clnt->msize - P9_IOHDRSZ;
1562
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001563 if (count < rsize)
1564 rsize = count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001565
Rob Landleyaca00762011-05-08 18:46:38 +00001566 /* Don't bother zerocopy for small IO (< 1024) */
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301567 if (clnt->trans_mod->zc_request && rsize > 1024) {
1568 char *indata;
1569 if (data) {
1570 kernel_buf = 1;
1571 indata = data;
1572 } else
Joe Perchesf07d9012012-06-04 07:16:14 +00001573 indata = (__force char *)udata;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301574 /*
1575 * response header len is 11
1576 * PDU Header(7) + IO Size (4)
1577 */
1578 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1579 11, kernel_buf, "dqd", fid->fid,
1580 offset, rsize);
Venkateswararao Jujjuri (JV)bb2f8a52011-01-28 17:05:59 -08001581 } else {
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301582 non_zc = 1;
Venkateswararao Jujjuri (JV)bb2f8a52011-01-28 17:05:59 -08001583 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301584 rsize);
Venkateswararao Jujjuri (JV)bb2f8a52011-01-28 17:05:59 -08001585 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001586 if (IS_ERR(req)) {
1587 err = PTR_ERR(req);
1588 goto error;
1589 }
1590
Sripathi Kodi342fee12010-03-05 18:50:14 +00001591 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001592 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301593 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001594 goto free_and_error;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001595 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001596
Joe Perches5d385152011-11-28 10:40:46 -08001597 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001598
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301599 if (non_zc) {
Venkateswararao Jujjuri (JV)bb2f8a52011-01-28 17:05:59 -08001600 if (data) {
1601 memmove(data, dataptr, count);
1602 } else {
1603 err = copy_to_user(udata, dataptr, count);
1604 if (err) {
1605 err = -EFAULT;
1606 goto free_and_error;
1607 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001608 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001609 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001610 p9_free_req(clnt, req);
1611 return count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001612
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001613free_and_error:
1614 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001615error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001616 return err;
1617}
1618EXPORT_SYMBOL(p9_client_read);
1619
Eric Van Hensbergen0fc96552008-10-13 20:36:17 -05001620int
1621p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1622 u64 offset, u32 count)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001623{
David S. Miller095d3da2011-04-12 15:58:41 -07001624 int err, rsize;
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301625 int kernel_buf = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001626 struct p9_client *clnt;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001627 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001628
Joe Perches5d385152011-11-28 10:40:46 -08001629 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +00001630 fid->fid, (unsigned long long) offset, count);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001631 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001632 clnt = fid->clnt;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001633
1634 rsize = fid->iounit;
1635 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1636 rsize = clnt->msize - P9_IOHDRSZ;
1637
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001638 if (count < rsize)
1639 rsize = count;
Venkateswararao Jujjuri (JV)1fc52482011-02-13 16:23:59 -08001640
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301641 /* Don't bother zerocopy for small IO (< 1024) */
1642 if (clnt->trans_mod->zc_request && rsize > 1024) {
1643 char *odata;
1644 if (data) {
1645 kernel_buf = 1;
1646 odata = data;
1647 } else
1648 odata = (char *)udata;
1649 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1650 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1651 fid->fid, offset, rsize);
Venkateswararao Jujjuri (JV)1fc52482011-02-13 16:23:59 -08001652 } else {
Venkateswararao Jujjuri (JV)1fc52482011-02-13 16:23:59 -08001653 if (data)
1654 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301655 offset, rsize, data);
Venkateswararao Jujjuri (JV)1fc52482011-02-13 16:23:59 -08001656 else
1657 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05301658 offset, rsize, udata);
Venkateswararao Jujjuri (JV)1fc52482011-02-13 16:23:59 -08001659 }
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001660 if (IS_ERR(req)) {
1661 err = PTR_ERR(req);
1662 goto error;
1663 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001664
Sripathi Kodi342fee12010-03-05 18:50:14 +00001665 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001666 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301667 trace_9p_protocol_dump(clnt, req->rc);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001668 goto free_and_error;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001669 }
1670
Joe Perches5d385152011-11-28 10:40:46 -08001671 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001672
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001673 p9_free_req(clnt, req);
1674 return count;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001675
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001676free_and_error:
1677 p9_free_req(clnt, req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001678error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001679 return err;
1680}
1681EXPORT_SYMBOL(p9_client_write);
1682
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001683struct p9_wstat *p9_client_stat(struct p9_fid *fid)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001684{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001685 int err;
1686 struct p9_client *clnt;
1687 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1688 struct p9_req_t *req;
1689 u16 ignored;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001690
Joe Perches5d385152011-11-28 10:40:46 -08001691 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001692
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001693 if (!ret)
1694 return ERR_PTR(-ENOMEM);
1695
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001696 err = 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001697 clnt = fid->clnt;
1698
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001699 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1700 if (IS_ERR(req)) {
1701 err = PTR_ERR(req);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001702 goto error;
1703 }
1704
Sripathi Kodi342fee12010-03-05 18:50:14 +00001705 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001706 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301707 trace_9p_protocol_dump(clnt, req->rc);
Abhishek Kulkarnieedfe1c2009-07-14 13:25:41 -05001708 p9_free_req(clnt, req);
1709 goto error;
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001710 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001711
Joe Perches5d385152011-11-28 10:40:46 -08001712 p9_debug(P9_DEBUG_9P,
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001713 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1714 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1715 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1716 "<<< uid=%d gid=%d n_muid=%d\n",
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001717 ret->size, ret->type, ret->dev, ret->qid.type,
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001718 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1719 ret->atime, ret->mtime, (unsigned long long)ret->length,
1720 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001721 from_kuid(&init_user_ns, ret->n_uid),
1722 from_kgid(&init_user_ns, ret->n_gid),
1723 from_kuid(&init_user_ns, ret->n_muid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001724
Latchesar Ionkov742b11a2009-04-05 16:26:41 -05001725 p9_free_req(clnt, req);
1726 return ret;
1727
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001728error:
Latchesar Ionkov742b11a2009-04-05 16:26:41 -05001729 kfree(ret);
1730 return ERR_PTR(err);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001731}
1732EXPORT_SYMBOL(p9_client_stat);
1733
Sripathi Kodif0853122010-07-12 20:07:23 +05301734struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1735 u64 request_mask)
1736{
1737 int err;
1738 struct p9_client *clnt;
1739 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1740 GFP_KERNEL);
1741 struct p9_req_t *req;
1742
Joe Perches5d385152011-11-28 10:40:46 -08001743 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
Sripathi Kodif0853122010-07-12 20:07:23 +05301744 fid->fid, request_mask);
1745
1746 if (!ret)
1747 return ERR_PTR(-ENOMEM);
1748
1749 err = 0;
1750 clnt = fid->clnt;
1751
1752 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1753 if (IS_ERR(req)) {
1754 err = PTR_ERR(req);
1755 goto error;
1756 }
1757
1758 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1759 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301760 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodif0853122010-07-12 20:07:23 +05301761 p9_free_req(clnt, req);
1762 goto error;
1763 }
1764
Joe Perches5d385152011-11-28 10:40:46 -08001765 p9_debug(P9_DEBUG_9P,
Sripathi Kodif0853122010-07-12 20:07:23 +05301766 "<<< RGETATTR st_result_mask=%lld\n"
1767 "<<< qid=%x.%llx.%x\n"
1768 "<<< st_mode=%8.8x st_nlink=%llu\n"
1769 "<<< st_uid=%d st_gid=%d\n"
1770 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1771 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1772 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1773 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1774 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1775 "<<< st_gen=%lld st_data_version=%lld",
1776 ret->st_result_mask, ret->qid.type, ret->qid.path,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001777 ret->qid.version, ret->st_mode, ret->st_nlink,
1778 from_kuid(&init_user_ns, ret->st_uid),
1779 from_kgid(&init_user_ns, ret->st_gid),
1780 ret->st_rdev, ret->st_size, ret->st_blksize,
Sripathi Kodif0853122010-07-12 20:07:23 +05301781 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1782 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1783 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1784 ret->st_gen, ret->st_data_version);
1785
1786 p9_free_req(clnt, req);
1787 return ret;
1788
1789error:
1790 kfree(ret);
1791 return ERR_PTR(err);
1792}
1793EXPORT_SYMBOL(p9_client_getattr_dotl);
1794
Sripathi Kodi342fee12010-03-05 18:50:14 +00001795static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001796{
1797 int ret;
1798
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001799 /* NOTE: size shouldn't include its own length */
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001800 /* size[2] type[2] dev[4] qid[13] */
1801 /* mode[4] atime[4] mtime[4] length[8]*/
1802 /* name[s] uid[s] gid[s] muid[s] */
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001803 ret = 2+4+13+4+4+4+8+2+2+2+2;
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001804
1805 if (wst->name)
1806 ret += strlen(wst->name);
1807 if (wst->uid)
1808 ret += strlen(wst->uid);
1809 if (wst->gid)
1810 ret += strlen(wst->gid);
1811 if (wst->muid)
1812 ret += strlen(wst->muid);
1813
Sripathi Kodic56e4ac2010-03-25 12:40:35 +00001814 if ((proto_version == p9_proto_2000u) ||
1815 (proto_version == p9_proto_2000L)) {
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001816 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1817 if (wst->extension)
1818 ret += strlen(wst->extension);
1819 }
1820
1821 return ret;
1822}
1823
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001824int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1825{
1826 int err;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001827 struct p9_req_t *req;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001828 struct p9_client *clnt;
1829
Latchesar Ionkov453ed902009-04-05 16:22:16 -05001830 err = 0;
1831 clnt = fid->clnt;
Sripathi Kodi342fee12010-03-05 18:50:14 +00001832 wst->size = p9_client_statsize(wst, clnt->proto_version);
Joe Perches5d385152011-11-28 10:40:46 -08001833 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1834 p9_debug(P9_DEBUG_9P,
Eric Van Hensbergene7f4b8f2008-10-17 16:20:07 -05001835 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1836 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1837 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1838 " uid=%d gid=%d n_muid=%d\n",
1839 wst->size, wst->type, wst->dev, wst->qid.type,
Randy Dunlapb0d5fde2008-11-04 20:46:46 -08001840 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1841 wst->atime, wst->mtime, (unsigned long long)wst->length,
1842 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
Eric W. Biederman447c5092013-01-29 16:18:50 -08001843 from_kuid(&init_user_ns, wst->n_uid),
1844 from_kgid(&init_user_ns, wst->n_gid),
1845 from_kuid(&init_user_ns, wst->n_muid));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001846
Eric Van Hensbergen9d6939d2010-01-15 19:01:56 -06001847 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001848 if (IS_ERR(req)) {
1849 err = PTR_ERR(req);
1850 goto error;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001851 }
1852
Joe Perches5d385152011-11-28 10:40:46 -08001853 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001854
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001855 p9_free_req(clnt, req);
1856error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001857 return err;
1858}
1859EXPORT_SYMBOL(p9_client_wstat);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001860
Sripathi Kodi87d78452010-06-18 11:50:10 +05301861int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1862{
1863 int err;
1864 struct p9_req_t *req;
1865 struct p9_client *clnt;
1866
1867 err = 0;
1868 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08001869 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1870 p9_debug(P9_DEBUG_9P,
Sripathi Kodi87d78452010-06-18 11:50:10 +05301871 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1872 " atime_sec=%lld atime_nsec=%lld\n"
1873 " mtime_sec=%lld mtime_nsec=%lld\n",
Eric W. Biederman447c5092013-01-29 16:18:50 -08001874 p9attr->valid, p9attr->mode,
1875 from_kuid(&init_user_ns, p9attr->uid),
1876 from_kgid(&init_user_ns, p9attr->gid),
Sripathi Kodi87d78452010-06-18 11:50:10 +05301877 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1878 p9attr->mtime_sec, p9attr->mtime_nsec);
1879
1880 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1881
1882 if (IS_ERR(req)) {
1883 err = PTR_ERR(req);
1884 goto error;
1885 }
Joe Perches5d385152011-11-28 10:40:46 -08001886 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
Sripathi Kodi87d78452010-06-18 11:50:10 +05301887 p9_free_req(clnt, req);
1888error:
1889 return err;
1890}
1891EXPORT_SYMBOL(p9_client_setattr);
1892
Sripathi Kodibda8e772010-03-25 12:45:30 +00001893int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1894{
1895 int err;
1896 struct p9_req_t *req;
1897 struct p9_client *clnt;
1898
1899 err = 0;
1900 clnt = fid->clnt;
1901
Joe Perches5d385152011-11-28 10:40:46 -08001902 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001903
1904 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1905 if (IS_ERR(req)) {
1906 err = PTR_ERR(req);
1907 goto error;
1908 }
1909
1910 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1911 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1912 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1913 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05301914 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodibda8e772010-03-25 12:45:30 +00001915 p9_free_req(clnt, req);
1916 goto error;
1917 }
1918
Joe Perches5d385152011-11-28 10:40:46 -08001919 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
Sripathi Kodibda8e772010-03-25 12:45:30 +00001920 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1921 "fsid %llu namelen %ld\n",
1922 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1923 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1924 sb->fsid, (long int)sb->namelen);
1925
1926 p9_free_req(clnt, req);
1927error:
1928 return err;
1929}
1930EXPORT_SYMBOL(p9_client_statfs);
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001931
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301932int p9_client_rename(struct p9_fid *fid,
1933 struct p9_fid *newdirfid, const char *name)
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001934{
1935 int err;
1936 struct p9_req_t *req;
1937 struct p9_client *clnt;
1938
1939 err = 0;
1940 clnt = fid->clnt;
1941
Joe Perches5d385152011-11-28 10:40:46 -08001942 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001943 fid->fid, newdirfid->fid, name);
1944
1945 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1946 newdirfid->fid, name);
1947 if (IS_ERR(req)) {
1948 err = PTR_ERR(req);
1949 goto error;
1950 }
1951
Joe Perches5d385152011-11-28 10:40:46 -08001952 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001953
1954 p9_free_req(clnt, req);
1955error:
1956 return err;
1957}
1958EXPORT_SYMBOL(p9_client_rename);
1959
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301960int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1961 struct p9_fid *newdirfid, const char *new_name)
1962{
1963 int err;
1964 struct p9_req_t *req;
1965 struct p9_client *clnt;
1966
1967 err = 0;
1968 clnt = olddirfid->clnt;
1969
Joe Perches5d385152011-11-28 10:40:46 -08001970 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301971 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1972 newdirfid->fid, new_name);
1973
1974 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1975 old_name, newdirfid->fid, new_name);
1976 if (IS_ERR(req)) {
1977 err = PTR_ERR(req);
1978 goto error;
1979 }
1980
Joe Perches5d385152011-11-28 10:40:46 -08001981 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +05301982 newdirfid->fid, new_name);
1983
1984 p9_free_req(clnt, req);
1985error:
1986 return err;
1987}
1988EXPORT_SYMBOL(p9_client_renameat);
1989
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05301990/*
1991 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1992 */
1993struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1994 const char *attr_name, u64 *attr_size)
1995{
1996 int err;
1997 struct p9_req_t *req;
1998 struct p9_client *clnt;
1999 struct p9_fid *attr_fid;
2000
2001 err = 0;
2002 clnt = file_fid->clnt;
2003 attr_fid = p9_fid_create(clnt);
2004 if (IS_ERR(attr_fid)) {
2005 err = PTR_ERR(attr_fid);
2006 attr_fid = NULL;
2007 goto error;
2008 }
Joe Perches5d385152011-11-28 10:40:46 -08002009 p9_debug(P9_DEBUG_9P,
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302010 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2011 file_fid->fid, attr_fid->fid, attr_name);
2012
2013 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2014 file_fid->fid, attr_fid->fid, attr_name);
2015 if (IS_ERR(req)) {
2016 err = PTR_ERR(req);
2017 goto error;
2018 }
2019 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2020 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302021 trace_9p_protocol_dump(clnt, req->rc);
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302022 p9_free_req(clnt, req);
2023 goto clunk_fid;
2024 }
2025 p9_free_req(clnt, req);
Joe Perches5d385152011-11-28 10:40:46 -08002026 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
Aneesh Kumar K.V0ef63f32010-05-31 13:22:45 +05302027 attr_fid->fid, *attr_size);
2028 return attr_fid;
2029clunk_fid:
2030 p9_client_clunk(attr_fid);
2031 attr_fid = NULL;
2032error:
2033 if (attr_fid && (attr_fid != file_fid))
2034 p9_fid_destroy(attr_fid);
2035
2036 return ERR_PTR(err);
2037}
2038EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2039
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302040int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2041 u64 attr_size, int flags)
2042{
2043 int err;
2044 struct p9_req_t *req;
2045 struct p9_client *clnt;
2046
Joe Perches5d385152011-11-28 10:40:46 -08002047 p9_debug(P9_DEBUG_9P,
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302048 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2049 fid->fid, name, (long long)attr_size, flags);
2050 err = 0;
2051 clnt = fid->clnt;
2052 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2053 fid->fid, name, attr_size, flags);
2054 if (IS_ERR(req)) {
2055 err = PTR_ERR(req);
2056 goto error;
2057 }
Joe Perches5d385152011-11-28 10:40:46 -08002058 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
Aneesh Kumar K.Veda25e462010-05-31 13:22:50 +05302059 p9_free_req(clnt, req);
2060error:
2061 return err;
2062}
2063EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2064
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002065int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2066{
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302067 int err, rsize, non_zc = 0;
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002068 struct p9_client *clnt;
2069 struct p9_req_t *req;
2070 char *dataptr;
2071
Joe Perches5d385152011-11-28 10:40:46 -08002072 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
Eric Dumazet95c96172012-04-15 05:58:06 +00002073 fid->fid, (unsigned long long) offset, count);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002074
2075 err = 0;
2076 clnt = fid->clnt;
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002077
2078 rsize = fid->iounit;
2079 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2080 rsize = clnt->msize - P9_READDIRHDRSZ;
2081
2082 if (count < rsize)
2083 rsize = count;
2084
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302085 /* Don't bother zerocopy for small IO (< 1024) */
2086 if (clnt->trans_mod->zc_request && rsize > 1024) {
2087 /*
2088 * response header len is 11
2089 * PDU Header(7) + IO Size (4)
2090 */
2091 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2092 11, 1, "dqd", fid->fid, offset, rsize);
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002093 } else {
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302094 non_zc = 1;
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002095 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302096 offset, rsize);
Venkateswararao Jujjuri (JV)2c665232011-02-16 18:43:20 -08002097 }
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002098 if (IS_ERR(req)) {
2099 err = PTR_ERR(req);
2100 goto error;
2101 }
2102
2103 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2104 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302105 trace_9p_protocol_dump(clnt, req->rc);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002106 goto free_and_error;
2107 }
2108
Joe Perches5d385152011-11-28 10:40:46 -08002109 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002110
Aneesh Kumar K.Vabfa0342011-08-16 10:50:10 +05302111 if (non_zc)
Sripathi Kodi7751bdb2010-06-04 13:41:26 +00002112 memmove(data, dataptr, count);
2113
2114 p9_free_req(clnt, req);
2115 return count;
2116
2117free_and_error:
2118 p9_free_req(clnt, req);
2119error:
2120 return err;
2121}
2122EXPORT_SYMBOL(p9_client_readdir);
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302123
2124int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002125 dev_t rdev, kgid_t gid, struct p9_qid *qid)
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302126{
2127 int err;
2128 struct p9_client *clnt;
2129 struct p9_req_t *req;
2130
2131 err = 0;
2132 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002133 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302134 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002135 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302136 MAJOR(rdev), MINOR(rdev), gid);
2137 if (IS_ERR(req))
2138 return PTR_ERR(req);
2139
2140 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2141 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302142 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302143 goto error;
2144 }
Joe Perches5d385152011-11-28 10:40:46 -08002145 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
M. Mohan Kumar4b435162010-06-16 14:27:01 +05302146 (unsigned long long)qid->path, qid->version);
2147
2148error:
2149 p9_free_req(clnt, req);
2150 return err;
2151
2152}
2153EXPORT_SYMBOL(p9_client_mknod_dotl);
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302154
2155int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002156 kgid_t gid, struct p9_qid *qid)
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302157{
2158 int err;
2159 struct p9_client *clnt;
2160 struct p9_req_t *req;
2161
2162 err = 0;
2163 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002164 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
Eric W. Biedermanf791f7c2013-01-29 16:09:41 -08002165 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2166 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302167 gid);
2168 if (IS_ERR(req))
2169 return PTR_ERR(req);
2170
2171 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2172 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302173 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302174 goto error;
2175 }
Joe Perches5d385152011-11-28 10:40:46 -08002176 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
M. Mohan Kumar01a622b2010-06-16 14:27:22 +05302177 (unsigned long long)qid->path, qid->version);
2178
2179error:
2180 p9_free_req(clnt, req);
2181 return err;
2182
2183}
2184EXPORT_SYMBOL(p9_client_mkdir_dotl);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302185
2186int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2187{
2188 int err;
2189 struct p9_client *clnt;
2190 struct p9_req_t *req;
2191
2192 err = 0;
2193 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002194 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
M. Mohan Kumara0990272010-09-27 11:34:24 +05302195 "start %lld length %lld proc_id %d client_id %s\n",
2196 fid->fid, flock->type, flock->flags, flock->start,
2197 flock->length, flock->proc_id, flock->client_id);
2198
2199 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2200 flock->flags, flock->start, flock->length,
2201 flock->proc_id, flock->client_id);
2202
2203 if (IS_ERR(req))
2204 return PTR_ERR(req);
2205
2206 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2207 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302208 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302209 goto error;
2210 }
Joe Perches5d385152011-11-28 10:40:46 -08002211 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
M. Mohan Kumara0990272010-09-27 11:34:24 +05302212error:
2213 p9_free_req(clnt, req);
2214 return err;
2215
2216}
2217EXPORT_SYMBOL(p9_client_lock_dotl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302218
2219int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2220{
2221 int err;
2222 struct p9_client *clnt;
2223 struct p9_req_t *req;
2224
2225 err = 0;
2226 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002227 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302228 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2229 glock->start, glock->length, glock->proc_id, glock->client_id);
2230
2231 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2232 glock->start, glock->length, glock->proc_id, glock->client_id);
2233
2234 if (IS_ERR(req))
2235 return PTR_ERR(req);
2236
2237 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2238 &glock->start, &glock->length, &glock->proc_id,
2239 &glock->client_id);
2240 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302241 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302242 goto error;
2243 }
Joe Perches5d385152011-11-28 10:40:46 -08002244 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +05302245 "proc_id %d client_id %s\n", glock->type, glock->start,
2246 glock->length, glock->proc_id, glock->client_id);
2247error:
2248 p9_free_req(clnt, req);
2249 return err;
2250}
2251EXPORT_SYMBOL(p9_client_getlock_dotl);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302252
2253int p9_client_readlink(struct p9_fid *fid, char **target)
2254{
2255 int err;
2256 struct p9_client *clnt;
2257 struct p9_req_t *req;
2258
2259 err = 0;
2260 clnt = fid->clnt;
Joe Perches5d385152011-11-28 10:40:46 -08002261 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302262
2263 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2264 if (IS_ERR(req))
2265 return PTR_ERR(req);
2266
2267 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2268 if (err) {
Aneesh Kumar K.V348b5902011-08-07 00:46:59 +05302269 trace_9p_protocol_dump(clnt, req->rc);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302270 goto error;
2271 }
Joe Perches5d385152011-11-28 10:40:46 -08002272 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
M. Mohan Kumar329176c2010-09-28 19:59:25 +05302273error:
2274 p9_free_req(clnt, req);
2275 return err;
2276}
2277EXPORT_SYMBOL(p9_client_readlink);