Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/nfs3proc.c
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1 /* 2 * linux/fs/nfs/nfs3proc.c 3 * 4 * Client-side NFSv3 procedures stubs. 5 * 6 * Copyright (C) 1997, Olaf Kirch 7 */ 8 9 #include <linux/mm.h> 10 #include <linux/utsname.h> 11 #include <linux/errno.h> 12 #include <linux/string.h> 13 #include <linux/sunrpc/clnt.h> 14 #include <linux/nfs.h> 15 #include <linux/nfs3.h> 16 #include <linux/nfs_fs.h> 17 18 #define NFSDBG_FACILITY NFSDBG_PROC 19 20 /* A wrapper to handle the EJUKEBOX error message */ 21 static int 22 nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) 23 { 24 sigset_t oldset; 25 int res; 26 rpc_clnt_sigmask(clnt, &oldset); 27 do { 28 res = rpc_call_sync(clnt, msg, flags); 29 if (res != -EJUKEBOX) 30 break; 31 set_current_state(TASK_INTERRUPTIBLE); 32 schedule_timeout(NFS_JUKEBOX_RETRY_TIME); 33 res = -ERESTARTSYS; 34 } while (!signalled()); 35 rpc_clnt_sigunmask(clnt, &oldset); 36 return res; 37 } 38 39 static inline int 40 nfs3_rpc_call_wrapper(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags) 41 { 42 struct rpc_message msg = { proc, argp, resp, NULL }; 43 return nfs3_rpc_wrapper(clnt, &msg, flags); 44 } 45 46 #define rpc_call(clnt, proc, argp, resp, flags) \ 47 nfs3_rpc_call_wrapper(clnt, proc, argp, resp, flags) 48 #define rpc_call_sync(clnt, msg, flags) \ 49 nfs3_rpc_wrapper(clnt, msg, flags) 50 51 /* 52 * Bare-bones access to getattr: this is for nfs_read_super. 53 */ 54 static int 55 nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 56 struct nfs_fattr *fattr) 57 { 58 int status; 59 60 dprintk("NFS call getroot\n"); 61 fattr->valid = 0; 62 status = rpc_call(server->client, NFS3PROC_GETATTR, fhandle, fattr, 0); 63 dprintk("NFS reply getroot\n"); 64 return status; 65 } 66 67 /* 68 * One function for each procedure in the NFS protocol. 69 */ 70 static int 71 nfs3_proc_getattr(struct inode *inode, struct nfs_fattr *fattr) 72 { 73 int status; 74 75 dprintk("NFS call getattr\n"); 76 fattr->valid = 0; 77 status = rpc_call(NFS_CLIENT(inode), NFS3PROC_GETATTR, 78 NFS_FH(inode), fattr, 0); 79 dprintk("NFS reply getattr\n"); 80 return status; 81 } 82 83 static int 84 nfs3_proc_setattr(struct inode *inode, struct nfs_fattr *fattr, 85 struct iattr *sattr) 86 { 87 struct nfs3_sattrargs arg = { NFS_FH(inode), sattr, 0, 0 }; 88 int status; 89 90 dprintk("NFS call setattr\n"); 91 fattr->valid = 0; 92 status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0); 93 dprintk("NFS reply setattr\n"); 94 return status; 95 } 96 97 static int 98 nfs3_proc_lookup(struct inode *dir, struct qstr *name, 99 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 100 { 101 struct nfs_fattr dir_attr; 102 struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len }; 103 struct nfs3_diropres res = { &dir_attr, fhandle, fattr }; 104 int status; 105 106 dprintk("NFS call lookup %s\n", name->name); 107 dir_attr.valid = 0; 108 fattr->valid = 0; 109 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_LOOKUP, &arg, &res, 0); 110 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) 111 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_GETATTR, 112 fhandle, fattr, 0); 113 dprintk("NFS reply lookup: %d\n", status); 114 if (status >= 0) 115 status = nfs_refresh_inode(dir, &dir_attr); 116 return status; 117 } 118 119 static int 120 nfs3_proc_access(struct inode *inode, int mode, int ruid) 121 { 122 struct nfs_fattr fattr; 123 struct nfs3_accessargs arg = { NFS_FH(inode), 0 }; 124 struct nfs3_accessres res = { &fattr, 0 }; 125 int status, flags; 126 127 dprintk("NFS call access\n"); 128 fattr.valid = 0; 129 130 if (mode & MAY_READ) 131 arg.access |= NFS3_ACCESS_READ; 132 if (S_ISDIR(inode->i_mode)) { 133 if (mode & MAY_WRITE) 134 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE; 135 if (mode & MAY_EXEC) 136 arg.access |= NFS3_ACCESS_LOOKUP; 137 } else { 138 if (mode & MAY_WRITE) 139 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND; 140 if (mode & MAY_EXEC) 141 arg.access |= NFS3_ACCESS_EXECUTE; 142 } 143 flags = (ruid) ? RPC_CALL_REALUID : 0; 144 status = rpc_call(NFS_CLIENT(inode), NFS3PROC_ACCESS, &arg, &res, flags); 145 nfs_refresh_inode(inode, &fattr); 146 dprintk("NFS reply access\n"); 147 148 if (status == 0 && (arg.access & res.access) != arg.access) 149 status = -EACCES; 150 return status; 151 } 152 153 static int 154 nfs3_proc_readlink(struct inode *inode, struct page *page) 155 { 156 struct nfs_fattr fattr; 157 struct nfs3_readlinkargs args = { NFS_FH(inode), PAGE_CACHE_SIZE, &page }; 158 int status; 159 160 dprintk("NFS call readlink\n"); 161 fattr.valid = 0; 162 status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK, 163 &args, &fattr, 0); 164 nfs_refresh_inode(inode, &fattr); 165 dprintk("NFS reply readlink: %d\n", status); 166 return status; 167 } 168 169 static int 170 nfs3_proc_read(struct inode *inode, struct rpc_cred *cred, 171 struct nfs_fattr *fattr, int flags, 172 unsigned int base, unsigned int count, struct page *page, 173 int *eofp) 174 { 175 u64 offset = page_offset(page) + base; 176 struct nfs_readargs arg = { NFS_FH(inode), offset, count, 177 base, &page }; 178 struct nfs_readres res = { fattr, count, 0 }; 179 struct rpc_message msg = { NFS3PROC_READ, &arg, &res, cred }; 180 int status; 181 182 dprintk("NFS call read %d @ %Ld\n", count, (long long)offset); 183 fattr->valid = 0; 184 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); 185 dprintk("NFS reply read: %d\n", status); 186 *eofp = res.eof; 187 return status; 188 } 189 190 static int 191 nfs3_proc_write(struct inode *inode, struct rpc_cred *cred, 192 struct nfs_fattr *fattr, int flags, 193 unsigned int base, unsigned int count, 194 struct page *page, struct nfs_writeverf *verf) 195 { 196 u64 offset = page_offset(page) + base; 197 struct nfs_writeargs arg = { NFS_FH(inode), offset, count, 198 NFS_FILE_SYNC, base, &page }; 199 struct nfs_writeres res = { fattr, verf, 0 }; 200 struct rpc_message msg = { NFS3PROC_WRITE, &arg, &res, cred }; 201 int status, rpcflags = 0; 202 203 dprintk("NFS call write %d @ %Ld\n", count, (long long)offset); 204 fattr->valid = 0; 205 if (flags & NFS_RW_SWAP) 206 rpcflags |= NFS_RPC_SWAPFLAGS; 207 arg.stable = (flags & NFS_RW_SYNC) ? NFS_FILE_SYNC : NFS_UNSTABLE; 208 209 status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags); 210 211 dprintk("NFS reply read: %d\n", status); 212 return status < 0? status : res.count; 213 } 214 215 /* 216 * Create a regular file. 217 * For now, we don't implement O_EXCL. 218 */ 219 static int 220 nfs3_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr, 221 int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 222 { 223 struct nfs_fattr dir_attr; 224 struct nfs3_createargs arg = { NFS_FH(dir), name->name, name->len, 225 sattr, 0, { 0, 0 } }; 226 struct nfs3_diropres res = { &dir_attr, fhandle, fattr }; 227 int status; 228 229 dprintk("NFS call create %s\n", name->name); 230 arg.createmode = NFS3_CREATE_UNCHECKED; 231 if (flags & O_EXCL) { 232 arg.createmode = NFS3_CREATE_EXCLUSIVE; 233 arg.verifier[0] = jiffies; 234 arg.verifier[1] = current->pid; 235 } 236 237 again: 238 dir_attr.valid = 0; 239 fattr->valid = 0; 240 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_CREATE, &arg, &res, 0); 241 nfs_refresh_inode(dir, &dir_attr); 242 243 /* If the server doesn't support the exclusive creation semantics, 244 * try again with simple 'guarded' mode. */ 245 if (status == NFSERR_NOTSUPP) { 246 switch (arg.createmode) { 247 case NFS3_CREATE_EXCLUSIVE: 248 arg.createmode = NFS3_CREATE_GUARDED; 249 break; 250 251 case NFS3_CREATE_GUARDED: 252 arg.createmode = NFS3_CREATE_UNCHECKED; 253 break; 254 255 case NFS3_CREATE_UNCHECKED: 256 goto exit; 257 } 258 goto again; 259 } 260 261 exit: 262 dprintk("NFS reply create: %d\n", status); 263 264 /* When we created the file with exclusive semantics, make 265 * sure we set the attributes afterwards. */ 266 if (status == 0 && arg.createmode == NFS3_CREATE_EXCLUSIVE) { 267 struct nfs3_sattrargs arg = { fhandle, sattr, 0, 0 }; 268 dprintk("NFS call setattr (post-create)\n"); 269 270 /* Note: we could use a guarded setattr here, but I'm 271 * not sure this buys us anything (and I'd have 272 * to revamp the NFSv3 XDR code) */ 273 fattr->valid = 0; 274 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SETATTR, 275 &arg, fattr, 0); 276 dprintk("NFS reply setattr (post-create): %d\n", status); 277 } 278 279 return status; 280 } 281 282 static int 283 nfs3_proc_remove(struct inode *dir, struct qstr *name) 284 { 285 struct nfs_fattr dir_attr; 286 struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len }; 287 struct rpc_message msg = { NFS3PROC_REMOVE, &arg, &dir_attr, NULL }; 288 int status; 289 290 dprintk("NFS call remove %s\n", name->name); 291 dir_attr.valid = 0; 292 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 293 nfs_refresh_inode(dir, &dir_attr); 294 dprintk("NFS reply remove: %d\n", status); 295 return status; 296 } 297 298 static int 299 nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name) 300 { 301 struct nfs3_diropargs *arg; 302 struct nfs_fattr *res; 303 struct unlinkxdr { 304 struct nfs3_diropargs arg; 305 struct nfs_fattr res; 306 } *ptr; 307 308 ptr = (struct unlinkxdr *)kmalloc(sizeof(*ptr), GFP_KERNEL); 309 if (!ptr) 310 return -ENOMEM; 311 arg = &ptr->arg; 312 res = &ptr->res; 313 arg->fh = NFS_FH(dir->d_inode); 314 arg->name = name->name; 315 arg->len = name->len; 316 res->valid = 0; 317 msg->rpc_proc = NFS3PROC_REMOVE; 318 msg->rpc_argp = arg; 319 msg->rpc_resp = res; 320 return 0; 321 } 322 323 static void 324 nfs3_proc_unlink_done(struct dentry *dir, struct rpc_message *msg) 325 { 326 struct nfs_fattr *dir_attr; 327 328 if (msg->rpc_argp) { 329 dir_attr = (struct nfs_fattr*)msg->rpc_resp; 330 nfs_refresh_inode(dir->d_inode, dir_attr); 331 kfree(msg->rpc_argp); 332 } 333 } 334 335 static int 336 nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name, 337 struct inode *new_dir, struct qstr *new_name) 338 { 339 struct nfs_fattr old_dir_attr, new_dir_attr; 340 struct nfs3_renameargs arg = { NFS_FH(old_dir), 341 old_name->name, old_name->len, 342 NFS_FH(new_dir), 343 new_name->name, new_name->len }; 344 struct nfs3_renameres res = { &old_dir_attr, &new_dir_attr }; 345 int status; 346 347 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); 348 old_dir_attr.valid = 0; 349 new_dir_attr.valid = 0; 350 status = rpc_call(NFS_CLIENT(old_dir), NFS3PROC_RENAME, &arg, &res, 0); 351 nfs_refresh_inode(old_dir, &old_dir_attr); 352 nfs_refresh_inode(new_dir, &new_dir_attr); 353 dprintk("NFS reply rename: %d\n", status); 354 return status; 355 } 356 357 static int 358 nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 359 { 360 struct nfs_fattr dir_attr, fattr; 361 struct nfs3_linkargs arg = { NFS_FH(inode), NFS_FH(dir), 362 name->name, name->len }; 363 struct nfs3_linkres res = { &dir_attr, &fattr }; 364 int status; 365 366 dprintk("NFS call link %s\n", name->name); 367 dir_attr.valid = 0; 368 fattr.valid = 0; 369 status = rpc_call(NFS_CLIENT(inode), NFS3PROC_LINK, &arg, &res, 0); 370 nfs_refresh_inode(dir, &dir_attr); 371 nfs_refresh_inode(inode, &fattr); 372 dprintk("NFS reply link: %d\n", status); 373 return status; 374 } 375 376 static int 377 nfs3_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path, 378 struct iattr *sattr, struct nfs_fh *fhandle, 379 struct nfs_fattr *fattr) 380 { 381 struct nfs_fattr dir_attr; 382 struct nfs3_symlinkargs arg = { NFS_FH(dir), name->name, name->len, 383 path->name, path->len, sattr }; 384 struct nfs3_diropres res = { &dir_attr, fhandle, fattr }; 385 int status; 386 387 dprintk("NFS call symlink %s -> %s\n", name->name, path->name); 388 dir_attr.valid = 0; 389 fattr->valid = 0; 390 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SYMLINK, &arg, &res, 0); 391 nfs_refresh_inode(dir, &dir_attr); 392 dprintk("NFS reply symlink: %d\n", status); 393 return status; 394 } 395 396 static int 397 nfs3_proc_mkdir(struct inode *dir, struct qstr *name, struct iattr *sattr, 398 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 399 { 400 struct nfs_fattr dir_attr; 401 struct nfs3_mkdirargs arg = { NFS_FH(dir), name->name, name->len, 402 sattr }; 403 struct nfs3_diropres res = { &dir_attr, fhandle, fattr }; 404 int status; 405 406 dprintk("NFS call mkdir %s\n", name->name); 407 dir_attr.valid = 0; 408 fattr->valid = 0; 409 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0); 410 nfs_refresh_inode(dir, &dir_attr); 411 dprintk("NFS reply mkdir: %d\n", status); 412 return status; 413 } 414 415 static int 416 nfs3_proc_rmdir(struct inode *dir, struct qstr *name) 417 { 418 struct nfs_fattr dir_attr; 419 struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len }; 420 int status; 421 422 dprintk("NFS call rmdir %s\n", name->name); 423 dir_attr.valid = 0; 424 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_RMDIR, &arg, &dir_attr, 0); 425 nfs_refresh_inode(dir, &dir_attr); 426 dprintk("NFS reply rmdir: %d\n", status); 427 return status; 428 } 429 430 /* 431 * The READDIR implementation is somewhat hackish - we pass the user buffer 432 * to the encode function, which installs it in the receive iovec. 433 * The decode function itself doesn't perform any decoding, it just makes 434 * sure the reply is syntactically correct. 435 * 436 * Also note that this implementation handles both plain readdir and 437 * readdirplus. 438 */ 439 static int 440 nfs3_proc_readdir(struct inode *dir, struct rpc_cred *cred, 441 u64 cookie, struct page *page, unsigned int count, int plus) 442 { 443 struct nfs_fattr dir_attr; 444 u32 *verf = NFS_COOKIEVERF(dir); 445 struct nfs3_readdirargs arg = { NFS_FH(dir), cookie, {verf[0], verf[1]}, 446 plus, count, &page }; 447 struct nfs3_readdirres res = { &dir_attr, verf, plus }; 448 struct rpc_message msg = { NFS3PROC_READDIR, &arg, &res, cred }; 449 int status; 450 451 if (plus) 452 msg.rpc_proc = NFS3PROC_READDIRPLUS; 453 454 dprintk("NFS call readdir%s %d\n", 455 plus? "plus" : "", (unsigned int) cookie); 456 457 dir_attr.valid = 0; 458 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 459 nfs_refresh_inode(dir, &dir_attr); 460 dprintk("NFS reply readdir: %d\n", status); 461 return status; 462 } 463 464 static int 465 nfs3_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr, 466 dev_t rdev, struct nfs_fh *fh, struct nfs_fattr *fattr) 467 { 468 struct nfs_fattr dir_attr; 469 struct nfs3_mknodargs arg = { NFS_FH(dir), name->name, name->len, 0, 470 sattr, rdev }; 471 struct nfs3_diropres res = { &dir_attr, fh, fattr }; 472 int status; 473 474 switch (sattr->ia_mode & S_IFMT) { 475 case S_IFBLK: arg.type = NF3BLK; break; 476 case S_IFCHR: arg.type = NF3CHR; break; 477 case S_IFIFO: arg.type = NF3FIFO; break; 478 case S_IFSOCK: arg.type = NF3SOCK; break; 479 default: return -EINVAL; 480 } 481 482 dprintk("NFS call mknod %s %x\n", name->name, rdev); 483 dir_attr.valid = 0; 484 fattr->valid = 0; 485 status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0); 486 nfs_refresh_inode(dir, &dir_attr); 487 dprintk("NFS reply mknod: %d\n", status); 488 return status; 489 } 490 491 /* 492 * This is a combo call of fsstat and fsinfo 493 */ 494 static int 495 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 496 struct nfs_fsinfo *info) 497 { 498 int status; 499 500 dprintk("NFS call fsstat\n"); 501 memset((char *)info, 0, sizeof(*info)); 502 status = rpc_call(server->client, NFS3PROC_FSSTAT, fhandle, info, 0); 503 if (status < 0) 504 goto error; 505 status = rpc_call(server->client, NFS3PROC_FSINFO, fhandle, info, 0); 506 507 error: 508 dprintk("NFS reply statfs: %d\n", status); 509 return status; 510 } 511 512 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int); 513 514 struct nfs_rpc_ops nfs_v3_clientops = { 515 3, /* protocol version */ 516 nfs3_proc_get_root, 517 nfs3_proc_getattr, 518 nfs3_proc_setattr, 519 nfs3_proc_lookup, 520 nfs3_proc_access, 521 nfs3_proc_readlink, 522 nfs3_proc_read, 523 nfs3_proc_write, 524 NULL, /* commit */ 525 nfs3_proc_create, 526 nfs3_proc_remove, 527 nfs3_proc_unlink_setup, 528 nfs3_proc_unlink_done, 529 nfs3_proc_rename, 530 nfs3_proc_link, 531 nfs3_proc_symlink, 532 nfs3_proc_mkdir, 533 nfs3_proc_rmdir, 534 nfs3_proc_readdir, 535 nfs3_proc_mknod, 536 nfs3_proc_statfs, 537 nfs3_decode_dirent, 538 };
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