Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * net/9p/clnt.c |
| 3 | * |
| 4 | * 9P Client |
| 5 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 7 | * 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 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 29 | #include <linux/poll.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 30 | #include <linux/idr.h> |
| 31 | #include <linux/mutex.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <net/9p/9p.h> |
Eric Van Hensbergen | fb0466c | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 35 | #include <linux/parser.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 36 | #include <net/9p/client.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 37 | #include <net/9p/transport.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 38 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 39 | /* |
| 40 | * Client Option Parsing (code inspired by NFS code) |
| 41 | * - a little lazy - parse all client options |
| 42 | */ |
| 43 | |
| 44 | enum { |
| 45 | Opt_msize, |
| 46 | Opt_trans, |
| 47 | Opt_legacy, |
| 48 | Opt_err, |
| 49 | }; |
| 50 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 51 | static const match_table_t tokens = { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 52 | {Opt_msize, "msize=%u"}, |
| 53 | {Opt_legacy, "noextend"}, |
| 54 | {Opt_trans, "trans=%s"}, |
| 55 | {Opt_err, NULL}, |
| 56 | }; |
| 57 | |
| 58 | /** |
| 59 | * v9fs_parse_options - parse mount options into session structure |
| 60 | * @options: options string passed from mount |
| 61 | * @v9ses: existing v9fs session information |
| 62 | * |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 63 | * Return 0 upon success, -ERRNO upon failure |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 64 | */ |
| 65 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 66 | static int parse_opts(char *opts, struct p9_client *clnt) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 67 | { |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 68 | char *options; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 69 | char *p; |
| 70 | substring_t args[MAX_OPT_ARGS]; |
| 71 | int option; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 72 | int ret = 0; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 73 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 74 | clnt->dotu = 1; |
| 75 | clnt->msize = 8192; |
| 76 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 77 | if (!opts) |
| 78 | return 0; |
| 79 | |
| 80 | options = kstrdup(opts, GFP_KERNEL); |
| 81 | if (!options) { |
| 82 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 83 | "failed to allocate copy of option string\n"); |
| 84 | return -ENOMEM; |
| 85 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 86 | |
| 87 | while ((p = strsep(&options, ",")) != NULL) { |
| 88 | int token; |
| 89 | if (!*p) |
| 90 | continue; |
| 91 | token = match_token(p, tokens, args); |
| 92 | if (token < Opt_trans) { |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 93 | int r = match_int(&args[0], &option); |
| 94 | if (r < 0) { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 95 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 96 | "integer field, but no integer?\n"); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 97 | ret = r; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 98 | continue; |
| 99 | } |
| 100 | } |
| 101 | switch (token) { |
| 102 | case Opt_msize: |
| 103 | clnt->msize = option; |
| 104 | break; |
| 105 | case Opt_trans: |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 106 | clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 107 | break; |
| 108 | case Opt_legacy: |
| 109 | clnt->dotu = 0; |
| 110 | break; |
| 111 | default: |
| 112 | continue; |
| 113 | } |
| 114 | } |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 115 | |
| 116 | if (!clnt->trans_mod) |
| 117 | clnt->trans_mod = v9fs_get_default_trans(); |
| 118 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 119 | kfree(options); |
| 120 | return ret; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 121 | } |
| 122 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame^] | 123 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
| 124 | { |
| 125 | int err; |
| 126 | struct p9_fid *fid; |
| 127 | |
| 128 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
| 129 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
| 130 | if (!fid) |
| 131 | return ERR_PTR(-ENOMEM); |
| 132 | |
| 133 | fid->fid = p9_idpool_get(clnt->fidpool); |
| 134 | if (fid->fid < 0) { |
| 135 | err = -ENOSPC; |
| 136 | goto error; |
| 137 | } |
| 138 | |
| 139 | memset(&fid->qid, 0, sizeof(struct p9_qid)); |
| 140 | fid->mode = -1; |
| 141 | fid->rdir_fpos = 0; |
| 142 | fid->rdir_pos = 0; |
| 143 | fid->rdir_fcall = NULL; |
| 144 | fid->uid = current->fsuid; |
| 145 | fid->clnt = clnt; |
| 146 | fid->aux = NULL; |
| 147 | |
| 148 | spin_lock(&clnt->lock); |
| 149 | list_add(&fid->flist, &clnt->fidlist); |
| 150 | spin_unlock(&clnt->lock); |
| 151 | |
| 152 | return fid; |
| 153 | |
| 154 | error: |
| 155 | kfree(fid); |
| 156 | return ERR_PTR(err); |
| 157 | } |
| 158 | |
| 159 | static void p9_fid_destroy(struct p9_fid *fid) |
| 160 | { |
| 161 | struct p9_client *clnt; |
| 162 | |
| 163 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 164 | clnt = fid->clnt; |
| 165 | p9_idpool_put(fid->fid, clnt->fidpool); |
| 166 | spin_lock(&clnt->lock); |
| 167 | list_del(&fid->flist); |
| 168 | spin_unlock(&clnt->lock); |
| 169 | kfree(fid->rdir_fcall); |
| 170 | kfree(fid); |
| 171 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 172 | |
Eric Van Hensbergen | 043aba4 | 2008-02-06 19:25:09 -0600 | [diff] [blame] | 173 | /** |
| 174 | * p9_client_rpc - sends 9P request and waits until a response is available. |
| 175 | * The function can be interrupted. |
| 176 | * @c: client data |
| 177 | * @tc: request to be sent |
| 178 | * @rc: pointer where a pointer to the response is stored |
| 179 | */ |
| 180 | int |
| 181 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, |
| 182 | struct p9_fcall **rc) |
| 183 | { |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 184 | return c->trans_mod->rpc(c, tc, rc); |
Eric Van Hensbergen | 043aba4 | 2008-02-06 19:25:09 -0600 | [diff] [blame] | 185 | } |
| 186 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 187 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 188 | { |
| 189 | int err, n; |
| 190 | struct p9_client *clnt; |
| 191 | struct p9_fcall *tc, *rc; |
| 192 | struct p9_str *version; |
| 193 | |
| 194 | err = 0; |
| 195 | tc = NULL; |
| 196 | rc = NULL; |
| 197 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
| 198 | if (!clnt) |
| 199 | return ERR_PTR(-ENOMEM); |
| 200 | |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 201 | clnt->trans_mod = NULL; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 202 | clnt->trans = NULL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 203 | spin_lock_init(&clnt->lock); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 204 | INIT_LIST_HEAD(&clnt->fidlist); |
| 205 | clnt->fidpool = p9_idpool_create(); |
Josef 'Jeff' Sipek | 728fc4e | 2008-03-07 11:40:33 -0600 | [diff] [blame] | 206 | if (IS_ERR(clnt->fidpool)) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 207 | err = PTR_ERR(clnt->fidpool); |
| 208 | clnt->fidpool = NULL; |
| 209 | goto error; |
| 210 | } |
| 211 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 212 | err = parse_opts(options, clnt); |
| 213 | if (err < 0) |
| 214 | goto error; |
| 215 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 216 | if (clnt->trans_mod == NULL) { |
| 217 | err = -EPROTONOSUPPORT; |
| 218 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 219 | "No transport defined or default transport\n"); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 220 | goto error; |
| 221 | } |
| 222 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 223 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", |
| 224 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); |
| 225 | |
| 226 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 227 | err = clnt->trans_mod->create(clnt, dev_name, options); |
| 228 | if (err) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 229 | goto error; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 230 | |
| 231 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
| 232 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; |
| 233 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 234 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); |
| 235 | if (IS_ERR(tc)) { |
| 236 | err = PTR_ERR(tc); |
| 237 | tc = NULL; |
| 238 | goto error; |
| 239 | } |
| 240 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 241 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 242 | if (err) |
| 243 | goto error; |
| 244 | |
| 245 | version = &rc->params.rversion.version; |
| 246 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) |
| 247 | clnt->dotu = 1; |
| 248 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) |
| 249 | clnt->dotu = 0; |
| 250 | else { |
| 251 | err = -EREMOTEIO; |
| 252 | goto error; |
| 253 | } |
| 254 | |
| 255 | n = rc->params.rversion.msize; |
| 256 | if (n < clnt->msize) |
| 257 | clnt->msize = n; |
| 258 | |
| 259 | kfree(tc); |
| 260 | kfree(rc); |
| 261 | return clnt; |
| 262 | |
| 263 | error: |
| 264 | kfree(tc); |
| 265 | kfree(rc); |
| 266 | p9_client_destroy(clnt); |
| 267 | return ERR_PTR(err); |
| 268 | } |
| 269 | EXPORT_SYMBOL(p9_client_create); |
| 270 | |
| 271 | void p9_client_destroy(struct p9_client *clnt) |
| 272 | { |
| 273 | struct p9_fid *fid, *fidptr; |
| 274 | |
| 275 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 276 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 277 | if (clnt->trans_mod) |
| 278 | clnt->trans_mod->close(clnt); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 279 | |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 280 | v9fs_put_trans(clnt->trans_mod); |
| 281 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 282 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
| 283 | p9_fid_destroy(fid); |
| 284 | |
Eric Van Hensbergen | 0af8887 | 2007-07-13 16:47:58 -0500 | [diff] [blame] | 285 | if (clnt->fidpool) |
| 286 | p9_idpool_destroy(clnt->fidpool); |
| 287 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 288 | kfree(clnt); |
| 289 | } |
| 290 | EXPORT_SYMBOL(p9_client_destroy); |
| 291 | |
| 292 | void p9_client_disconnect(struct p9_client *clnt) |
| 293 | { |
| 294 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 295 | clnt->status = Disconnected; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 296 | } |
| 297 | EXPORT_SYMBOL(p9_client_disconnect); |
| 298 | |
| 299 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 300 | char *uname, u32 n_uname, char *aname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 301 | { |
| 302 | int err; |
| 303 | struct p9_fcall *tc, *rc; |
| 304 | struct p9_fid *fid; |
| 305 | |
| 306 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", |
| 307 | clnt, afid?afid->fid:-1, uname, aname); |
| 308 | err = 0; |
| 309 | tc = NULL; |
| 310 | rc = NULL; |
| 311 | |
| 312 | fid = p9_fid_create(clnt); |
| 313 | if (IS_ERR(fid)) { |
| 314 | err = PTR_ERR(fid); |
| 315 | fid = NULL; |
| 316 | goto error; |
| 317 | } |
| 318 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 319 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
| 320 | n_uname, clnt->dotu); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 321 | if (IS_ERR(tc)) { |
| 322 | err = PTR_ERR(tc); |
| 323 | tc = NULL; |
| 324 | goto error; |
| 325 | } |
| 326 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 327 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 328 | if (err) |
| 329 | goto error; |
| 330 | |
| 331 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); |
| 332 | kfree(tc); |
| 333 | kfree(rc); |
| 334 | return fid; |
| 335 | |
| 336 | error: |
| 337 | kfree(tc); |
| 338 | kfree(rc); |
| 339 | if (fid) |
| 340 | p9_fid_destroy(fid); |
| 341 | return ERR_PTR(err); |
| 342 | } |
| 343 | EXPORT_SYMBOL(p9_client_attach); |
| 344 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 345 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
| 346 | u32 n_uname, char *aname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 347 | { |
| 348 | int err; |
| 349 | struct p9_fcall *tc, *rc; |
| 350 | struct p9_fid *fid; |
| 351 | |
| 352 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, |
| 353 | aname); |
| 354 | err = 0; |
| 355 | tc = NULL; |
| 356 | rc = NULL; |
| 357 | |
| 358 | fid = p9_fid_create(clnt); |
| 359 | if (IS_ERR(fid)) { |
| 360 | err = PTR_ERR(fid); |
| 361 | fid = NULL; |
| 362 | goto error; |
| 363 | } |
| 364 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 365 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 366 | if (IS_ERR(tc)) { |
| 367 | err = PTR_ERR(tc); |
| 368 | tc = NULL; |
| 369 | goto error; |
| 370 | } |
| 371 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 372 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 373 | if (err) |
| 374 | goto error; |
| 375 | |
| 376 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); |
| 377 | kfree(tc); |
| 378 | kfree(rc); |
| 379 | return fid; |
| 380 | |
| 381 | error: |
| 382 | kfree(tc); |
| 383 | kfree(rc); |
| 384 | if (fid) |
| 385 | p9_fid_destroy(fid); |
| 386 | return ERR_PTR(err); |
| 387 | } |
| 388 | EXPORT_SYMBOL(p9_client_auth); |
| 389 | |
| 390 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, |
| 391 | int clone) |
| 392 | { |
| 393 | int err; |
| 394 | struct p9_fcall *tc, *rc; |
| 395 | struct p9_client *clnt; |
| 396 | struct p9_fid *fid; |
| 397 | |
| 398 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", |
| 399 | oldfid->fid, nwname, wnames?wnames[0]:NULL); |
| 400 | err = 0; |
| 401 | tc = NULL; |
| 402 | rc = NULL; |
| 403 | clnt = oldfid->clnt; |
| 404 | if (clone) { |
| 405 | fid = p9_fid_create(clnt); |
| 406 | if (IS_ERR(fid)) { |
| 407 | err = PTR_ERR(fid); |
| 408 | fid = NULL; |
| 409 | goto error; |
| 410 | } |
| 411 | |
| 412 | fid->uid = oldfid->uid; |
| 413 | } else |
| 414 | fid = oldfid; |
| 415 | |
| 416 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); |
| 417 | if (IS_ERR(tc)) { |
| 418 | err = PTR_ERR(tc); |
| 419 | tc = NULL; |
| 420 | goto error; |
| 421 | } |
| 422 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 423 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 424 | if (err) { |
| 425 | if (rc && rc->id == P9_RWALK) |
| 426 | goto clunk_fid; |
| 427 | else |
| 428 | goto error; |
| 429 | } |
| 430 | |
| 431 | if (rc->params.rwalk.nwqid != nwname) { |
| 432 | err = -ENOENT; |
| 433 | goto clunk_fid; |
| 434 | } |
| 435 | |
| 436 | if (nwname) |
| 437 | memmove(&fid->qid, |
| 438 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], |
| 439 | sizeof(struct p9_qid)); |
| 440 | else |
| 441 | fid->qid = oldfid->qid; |
| 442 | |
| 443 | kfree(tc); |
| 444 | kfree(rc); |
| 445 | return fid; |
| 446 | |
| 447 | clunk_fid: |
| 448 | kfree(tc); |
| 449 | kfree(rc); |
| 450 | rc = NULL; |
| 451 | tc = p9_create_tclunk(fid->fid); |
| 452 | if (IS_ERR(tc)) { |
| 453 | err = PTR_ERR(tc); |
| 454 | tc = NULL; |
| 455 | goto error; |
| 456 | } |
| 457 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 458 | p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 459 | |
| 460 | error: |
| 461 | kfree(tc); |
| 462 | kfree(rc); |
| 463 | if (fid && (fid != oldfid)) |
| 464 | p9_fid_destroy(fid); |
| 465 | |
| 466 | return ERR_PTR(err); |
| 467 | } |
| 468 | EXPORT_SYMBOL(p9_client_walk); |
| 469 | |
| 470 | int p9_client_open(struct p9_fid *fid, int mode) |
| 471 | { |
| 472 | int err; |
| 473 | struct p9_fcall *tc, *rc; |
| 474 | struct p9_client *clnt; |
| 475 | |
| 476 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); |
| 477 | err = 0; |
| 478 | tc = NULL; |
| 479 | rc = NULL; |
| 480 | clnt = fid->clnt; |
| 481 | |
| 482 | if (fid->mode != -1) |
| 483 | return -EINVAL; |
| 484 | |
| 485 | tc = p9_create_topen(fid->fid, mode); |
| 486 | if (IS_ERR(tc)) { |
| 487 | err = PTR_ERR(tc); |
| 488 | tc = NULL; |
| 489 | goto done; |
| 490 | } |
| 491 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 492 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 493 | if (err) |
| 494 | goto done; |
| 495 | |
| 496 | fid->mode = mode; |
| 497 | fid->iounit = rc->params.ropen.iounit; |
| 498 | |
| 499 | done: |
| 500 | kfree(tc); |
| 501 | kfree(rc); |
| 502 | return err; |
| 503 | } |
| 504 | EXPORT_SYMBOL(p9_client_open); |
| 505 | |
| 506 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, |
| 507 | char *extension) |
| 508 | { |
| 509 | int err; |
| 510 | struct p9_fcall *tc, *rc; |
| 511 | struct p9_client *clnt; |
| 512 | |
| 513 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, |
| 514 | name, perm, mode); |
| 515 | err = 0; |
| 516 | tc = NULL; |
| 517 | rc = NULL; |
| 518 | clnt = fid->clnt; |
| 519 | |
| 520 | if (fid->mode != -1) |
| 521 | return -EINVAL; |
| 522 | |
| 523 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, |
| 524 | clnt->dotu); |
| 525 | if (IS_ERR(tc)) { |
| 526 | err = PTR_ERR(tc); |
| 527 | tc = NULL; |
| 528 | goto done; |
| 529 | } |
| 530 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 531 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 532 | if (err) |
| 533 | goto done; |
| 534 | |
| 535 | fid->mode = mode; |
| 536 | fid->iounit = rc->params.ropen.iounit; |
| 537 | |
| 538 | done: |
| 539 | kfree(tc); |
| 540 | kfree(rc); |
| 541 | return err; |
| 542 | } |
| 543 | EXPORT_SYMBOL(p9_client_fcreate); |
| 544 | |
| 545 | int p9_client_clunk(struct p9_fid *fid) |
| 546 | { |
| 547 | int err; |
| 548 | struct p9_fcall *tc, *rc; |
| 549 | struct p9_client *clnt; |
| 550 | |
| 551 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 552 | err = 0; |
| 553 | tc = NULL; |
| 554 | rc = NULL; |
| 555 | clnt = fid->clnt; |
| 556 | |
| 557 | tc = p9_create_tclunk(fid->fid); |
| 558 | if (IS_ERR(tc)) { |
| 559 | err = PTR_ERR(tc); |
| 560 | tc = NULL; |
| 561 | goto done; |
| 562 | } |
| 563 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 564 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 565 | if (err) |
| 566 | goto done; |
| 567 | |
| 568 | p9_fid_destroy(fid); |
| 569 | |
| 570 | done: |
| 571 | kfree(tc); |
| 572 | kfree(rc); |
| 573 | return err; |
| 574 | } |
| 575 | EXPORT_SYMBOL(p9_client_clunk); |
| 576 | |
| 577 | int p9_client_remove(struct p9_fid *fid) |
| 578 | { |
| 579 | int err; |
| 580 | struct p9_fcall *tc, *rc; |
| 581 | struct p9_client *clnt; |
| 582 | |
| 583 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 584 | err = 0; |
| 585 | tc = NULL; |
| 586 | rc = NULL; |
| 587 | clnt = fid->clnt; |
| 588 | |
| 589 | tc = p9_create_tremove(fid->fid); |
| 590 | if (IS_ERR(tc)) { |
| 591 | err = PTR_ERR(tc); |
| 592 | tc = NULL; |
| 593 | goto done; |
| 594 | } |
| 595 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 596 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 597 | if (err) |
| 598 | goto done; |
| 599 | |
| 600 | p9_fid_destroy(fid); |
| 601 | |
| 602 | done: |
| 603 | kfree(tc); |
| 604 | kfree(rc); |
| 605 | return err; |
| 606 | } |
| 607 | EXPORT_SYMBOL(p9_client_remove); |
| 608 | |
| 609 | int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) |
| 610 | { |
| 611 | int err, n, rsize, total; |
| 612 | struct p9_fcall *tc, *rc; |
| 613 | struct p9_client *clnt; |
| 614 | |
| 615 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, |
| 616 | (long long unsigned) offset, count); |
| 617 | err = 0; |
| 618 | tc = NULL; |
| 619 | rc = NULL; |
| 620 | clnt = fid->clnt; |
| 621 | total = 0; |
| 622 | |
| 623 | rsize = fid->iounit; |
| 624 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 625 | rsize = clnt->msize - P9_IOHDRSZ; |
| 626 | |
| 627 | do { |
| 628 | if (count < rsize) |
| 629 | rsize = count; |
| 630 | |
| 631 | tc = p9_create_tread(fid->fid, offset, rsize); |
| 632 | if (IS_ERR(tc)) { |
| 633 | err = PTR_ERR(tc); |
| 634 | tc = NULL; |
| 635 | goto error; |
| 636 | } |
| 637 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 638 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 639 | if (err) |
| 640 | goto error; |
| 641 | |
| 642 | n = rc->params.rread.count; |
| 643 | if (n > count) |
| 644 | n = count; |
| 645 | |
| 646 | memmove(data, rc->params.rread.data, n); |
| 647 | count -= n; |
| 648 | data += n; |
| 649 | offset += n; |
| 650 | total += n; |
| 651 | kfree(tc); |
| 652 | tc = NULL; |
| 653 | kfree(rc); |
| 654 | rc = NULL; |
| 655 | } while (count > 0 && n == rsize); |
| 656 | |
| 657 | return total; |
| 658 | |
| 659 | error: |
| 660 | kfree(tc); |
| 661 | kfree(rc); |
| 662 | return err; |
| 663 | } |
| 664 | EXPORT_SYMBOL(p9_client_read); |
| 665 | |
| 666 | int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) |
| 667 | { |
| 668 | int err, n, rsize, total; |
| 669 | struct p9_fcall *tc, *rc; |
| 670 | struct p9_client *clnt; |
| 671 | |
| 672 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, |
| 673 | (long long unsigned) offset, count); |
| 674 | err = 0; |
| 675 | tc = NULL; |
| 676 | rc = NULL; |
| 677 | clnt = fid->clnt; |
| 678 | total = 0; |
| 679 | |
| 680 | rsize = fid->iounit; |
| 681 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 682 | rsize = clnt->msize - P9_IOHDRSZ; |
| 683 | |
| 684 | do { |
| 685 | if (count < rsize) |
| 686 | rsize = count; |
| 687 | |
| 688 | tc = p9_create_twrite(fid->fid, offset, rsize, data); |
| 689 | if (IS_ERR(tc)) { |
| 690 | err = PTR_ERR(tc); |
| 691 | tc = NULL; |
| 692 | goto error; |
| 693 | } |
| 694 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 695 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 696 | if (err) |
| 697 | goto error; |
| 698 | |
| 699 | n = rc->params.rread.count; |
| 700 | count -= n; |
| 701 | data += n; |
| 702 | offset += n; |
| 703 | total += n; |
| 704 | kfree(tc); |
| 705 | tc = NULL; |
| 706 | kfree(rc); |
| 707 | rc = NULL; |
| 708 | } while (count > 0); |
| 709 | |
| 710 | return total; |
| 711 | |
| 712 | error: |
| 713 | kfree(tc); |
| 714 | kfree(rc); |
| 715 | return err; |
| 716 | } |
| 717 | EXPORT_SYMBOL(p9_client_write); |
| 718 | |
| 719 | int |
| 720 | p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) |
| 721 | { |
| 722 | int err, n, rsize, total; |
| 723 | struct p9_fcall *tc, *rc; |
| 724 | struct p9_client *clnt; |
| 725 | |
| 726 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, |
| 727 | (long long unsigned) offset, count); |
| 728 | err = 0; |
| 729 | tc = NULL; |
| 730 | rc = NULL; |
| 731 | clnt = fid->clnt; |
| 732 | total = 0; |
| 733 | |
| 734 | rsize = fid->iounit; |
| 735 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 736 | rsize = clnt->msize - P9_IOHDRSZ; |
| 737 | |
| 738 | do { |
| 739 | if (count < rsize) |
| 740 | rsize = count; |
| 741 | |
| 742 | tc = p9_create_tread(fid->fid, offset, rsize); |
| 743 | if (IS_ERR(tc)) { |
| 744 | err = PTR_ERR(tc); |
| 745 | tc = NULL; |
| 746 | goto error; |
| 747 | } |
| 748 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 749 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 750 | if (err) |
| 751 | goto error; |
| 752 | |
| 753 | n = rc->params.rread.count; |
| 754 | if (n > count) |
| 755 | n = count; |
| 756 | |
| 757 | err = copy_to_user(data, rc->params.rread.data, n); |
| 758 | if (err) { |
| 759 | err = -EFAULT; |
| 760 | goto error; |
| 761 | } |
| 762 | |
| 763 | count -= n; |
| 764 | data += n; |
| 765 | offset += n; |
| 766 | total += n; |
| 767 | kfree(tc); |
| 768 | tc = NULL; |
| 769 | kfree(rc); |
| 770 | rc = NULL; |
| 771 | } while (count > 0 && n == rsize); |
| 772 | |
| 773 | return total; |
| 774 | |
| 775 | error: |
| 776 | kfree(tc); |
| 777 | kfree(rc); |
| 778 | return err; |
| 779 | } |
| 780 | EXPORT_SYMBOL(p9_client_uread); |
| 781 | |
| 782 | int |
| 783 | p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, |
| 784 | u32 count) |
| 785 | { |
| 786 | int err, n, rsize, total; |
| 787 | struct p9_fcall *tc, *rc; |
| 788 | struct p9_client *clnt; |
| 789 | |
| 790 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, |
| 791 | (long long unsigned) offset, count); |
| 792 | err = 0; |
| 793 | tc = NULL; |
| 794 | rc = NULL; |
| 795 | clnt = fid->clnt; |
| 796 | total = 0; |
| 797 | |
| 798 | rsize = fid->iounit; |
| 799 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 800 | rsize = clnt->msize - P9_IOHDRSZ; |
| 801 | |
| 802 | do { |
| 803 | if (count < rsize) |
| 804 | rsize = count; |
| 805 | |
| 806 | tc = p9_create_twrite_u(fid->fid, offset, rsize, data); |
| 807 | if (IS_ERR(tc)) { |
| 808 | err = PTR_ERR(tc); |
| 809 | tc = NULL; |
| 810 | goto error; |
| 811 | } |
| 812 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 813 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 814 | if (err) |
| 815 | goto error; |
| 816 | |
| 817 | n = rc->params.rread.count; |
| 818 | count -= n; |
| 819 | data += n; |
| 820 | offset += n; |
| 821 | total += n; |
| 822 | kfree(tc); |
| 823 | tc = NULL; |
| 824 | kfree(rc); |
| 825 | rc = NULL; |
| 826 | } while (count > 0); |
| 827 | |
| 828 | return total; |
| 829 | |
| 830 | error: |
| 831 | kfree(tc); |
| 832 | kfree(rc); |
| 833 | return err; |
| 834 | } |
| 835 | EXPORT_SYMBOL(p9_client_uwrite); |
| 836 | |
| 837 | int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) |
| 838 | { |
| 839 | int n, total; |
| 840 | |
| 841 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, |
| 842 | (long long unsigned) offset, count); |
| 843 | n = 0; |
| 844 | total = 0; |
| 845 | while (count) { |
| 846 | n = p9_client_read(fid, data, offset, count); |
| 847 | if (n <= 0) |
| 848 | break; |
| 849 | |
| 850 | data += n; |
| 851 | offset += n; |
| 852 | count -= n; |
| 853 | total += n; |
| 854 | } |
| 855 | |
| 856 | if (n < 0) |
| 857 | total = n; |
| 858 | |
| 859 | return total; |
| 860 | } |
| 861 | EXPORT_SYMBOL(p9_client_readn); |
| 862 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame^] | 863 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) |
| 864 | { |
| 865 | int n; |
| 866 | char *p; |
| 867 | struct p9_stat *ret; |
| 868 | |
| 869 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + |
| 870 | st->muid.len; |
| 871 | |
| 872 | if (dotu) |
| 873 | n += st->extension.len; |
| 874 | |
| 875 | ret = kmalloc(n, GFP_KERNEL); |
| 876 | if (!ret) |
| 877 | return ERR_PTR(-ENOMEM); |
| 878 | |
| 879 | memmove(ret, st, sizeof(struct p9_stat)); |
| 880 | p = ((char *) ret) + sizeof(struct p9_stat); |
| 881 | memmove(p, st->name.str, st->name.len); |
| 882 | ret->name.str = p; |
| 883 | p += st->name.len; |
| 884 | memmove(p, st->uid.str, st->uid.len); |
| 885 | ret->uid.str = p; |
| 886 | p += st->uid.len; |
| 887 | memmove(p, st->gid.str, st->gid.len); |
| 888 | ret->gid.str = p; |
| 889 | p += st->gid.len; |
| 890 | memmove(p, st->muid.str, st->muid.len); |
| 891 | ret->muid.str = p; |
| 892 | p += st->muid.len; |
| 893 | |
| 894 | if (dotu) { |
| 895 | memmove(p, st->extension.str, st->extension.len); |
| 896 | ret->extension.str = p; |
| 897 | p += st->extension.len; |
| 898 | } |
| 899 | |
| 900 | return ret; |
| 901 | } |
| 902 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 903 | struct p9_stat *p9_client_stat(struct p9_fid *fid) |
| 904 | { |
| 905 | int err; |
| 906 | struct p9_fcall *tc, *rc; |
| 907 | struct p9_client *clnt; |
| 908 | struct p9_stat *ret; |
| 909 | |
| 910 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 911 | err = 0; |
| 912 | tc = NULL; |
| 913 | rc = NULL; |
| 914 | ret = NULL; |
| 915 | clnt = fid->clnt; |
| 916 | |
| 917 | tc = p9_create_tstat(fid->fid); |
| 918 | if (IS_ERR(tc)) { |
| 919 | err = PTR_ERR(tc); |
| 920 | tc = NULL; |
| 921 | goto error; |
| 922 | } |
| 923 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 924 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 925 | if (err) |
| 926 | goto error; |
| 927 | |
| 928 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); |
| 929 | if (IS_ERR(ret)) { |
| 930 | err = PTR_ERR(ret); |
| 931 | ret = NULL; |
| 932 | goto error; |
| 933 | } |
| 934 | |
| 935 | kfree(tc); |
| 936 | kfree(rc); |
| 937 | return ret; |
| 938 | |
| 939 | error: |
| 940 | kfree(tc); |
| 941 | kfree(rc); |
| 942 | kfree(ret); |
| 943 | return ERR_PTR(err); |
| 944 | } |
| 945 | EXPORT_SYMBOL(p9_client_stat); |
| 946 | |
| 947 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
| 948 | { |
| 949 | int err; |
| 950 | struct p9_fcall *tc, *rc; |
| 951 | struct p9_client *clnt; |
| 952 | |
| 953 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 954 | err = 0; |
| 955 | tc = NULL; |
| 956 | rc = NULL; |
| 957 | clnt = fid->clnt; |
| 958 | |
| 959 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); |
| 960 | if (IS_ERR(tc)) { |
| 961 | err = PTR_ERR(tc); |
| 962 | tc = NULL; |
| 963 | goto done; |
| 964 | } |
| 965 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 966 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 967 | |
| 968 | done: |
| 969 | kfree(tc); |
| 970 | kfree(rc); |
| 971 | return err; |
| 972 | } |
| 973 | EXPORT_SYMBOL(p9_client_wstat); |
| 974 | |
| 975 | struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) |
| 976 | { |
| 977 | int err, n, m; |
| 978 | struct p9_fcall *tc, *rc; |
| 979 | struct p9_client *clnt; |
| 980 | struct p9_stat st, *ret; |
| 981 | |
| 982 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid, |
| 983 | (long long unsigned) offset); |
| 984 | err = 0; |
| 985 | tc = NULL; |
| 986 | rc = NULL; |
| 987 | ret = NULL; |
| 988 | clnt = fid->clnt; |
| 989 | |
| 990 | /* if the offset is below or above the current response, free it */ |
| 991 | if (offset < fid->rdir_fpos || (fid->rdir_fcall && |
| 992 | offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) { |
| 993 | fid->rdir_pos = 0; |
| 994 | if (fid->rdir_fcall) |
| 995 | fid->rdir_fpos += fid->rdir_fcall->params.rread.count; |
| 996 | |
| 997 | kfree(fid->rdir_fcall); |
| 998 | fid->rdir_fcall = NULL; |
| 999 | if (offset < fid->rdir_fpos) |
| 1000 | fid->rdir_fpos = 0; |
| 1001 | } |
| 1002 | |
| 1003 | if (!fid->rdir_fcall) { |
| 1004 | n = fid->iounit; |
| 1005 | if (!n || n > clnt->msize-P9_IOHDRSZ) |
| 1006 | n = clnt->msize - P9_IOHDRSZ; |
| 1007 | |
| 1008 | while (1) { |
| 1009 | if (fid->rdir_fcall) { |
| 1010 | fid->rdir_fpos += |
| 1011 | fid->rdir_fcall->params.rread.count; |
| 1012 | kfree(fid->rdir_fcall); |
| 1013 | fid->rdir_fcall = NULL; |
| 1014 | } |
| 1015 | |
| 1016 | tc = p9_create_tread(fid->fid, fid->rdir_fpos, n); |
| 1017 | if (IS_ERR(tc)) { |
| 1018 | err = PTR_ERR(tc); |
| 1019 | tc = NULL; |
| 1020 | goto error; |
| 1021 | } |
| 1022 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1023 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1024 | if (err) |
| 1025 | goto error; |
| 1026 | |
| 1027 | n = rc->params.rread.count; |
| 1028 | if (n == 0) |
| 1029 | goto done; |
| 1030 | |
| 1031 | fid->rdir_fcall = rc; |
| 1032 | rc = NULL; |
| 1033 | if (offset >= fid->rdir_fpos && |
| 1034 | offset < fid->rdir_fpos+n) |
| 1035 | break; |
| 1036 | } |
| 1037 | |
| 1038 | fid->rdir_pos = 0; |
| 1039 | } |
| 1040 | |
| 1041 | m = offset - fid->rdir_fpos; |
| 1042 | if (m < 0) |
| 1043 | goto done; |
| 1044 | |
| 1045 | n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m, |
| 1046 | fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu); |
| 1047 | |
| 1048 | if (!n) { |
| 1049 | err = -EIO; |
| 1050 | goto error; |
| 1051 | } |
| 1052 | |
| 1053 | fid->rdir_pos += n; |
| 1054 | st.size = n; |
| 1055 | ret = p9_clone_stat(&st, clnt->dotu); |
| 1056 | if (IS_ERR(ret)) { |
| 1057 | err = PTR_ERR(ret); |
| 1058 | ret = NULL; |
| 1059 | goto error; |
| 1060 | } |
| 1061 | |
| 1062 | done: |
| 1063 | kfree(tc); |
| 1064 | kfree(rc); |
| 1065 | return ret; |
| 1066 | |
| 1067 | error: |
| 1068 | kfree(tc); |
| 1069 | kfree(rc); |
| 1070 | kfree(ret); |
| 1071 | return ERR_PTR(err); |
| 1072 | } |
| 1073 | EXPORT_SYMBOL(p9_client_dirread); |