fs/nfs/nfs3proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/nfs/nfs3proc.c
   4  *
   5  *  Client-side NFSv3 procedures stubs.
   6  *
   7  *  Copyright (C) 1997, Olaf Kirch
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/errno.h>
  12 #include <linux/string.h>
  13 #include <linux/sunrpc/clnt.h>
  14 #include <linux/slab.h>
  15 #include <linux/nfs.h>
  16 #include <linux/nfs3.h>
  17 #include <linux/nfs_fs.h>
  18 #include <linux/nfs_page.h>
  19 #include <linux/lockd/bind.h>
  20 #include <linux/nfs_mount.h>
  21 #include <linux/freezer.h>
  22 #include <linux/xattr.h>
  23
  24 #include "iostat.h"
  25 #include "internal.h"
  26 #include "nfs3_fs.h"
  27
  28 #define NFSDBG_FACILITY         NFSDBG_PROC
  29
  30 /* A wrapper to handle the EJUKEBOX error messages */
  31 static int
  32 nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  33 {
  34         int res;
  35         do {
  36                 res = rpc_call_sync(clnt, msg, flags);
  37                 if (res != -EJUKEBOX)
  38                         break;
  39                 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
  40                 schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
  41                 res = -ERESTARTSYS;
  42         } while (!fatal_signal_pending(current));
  43         return res;
  44 }
  45
  46 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
  47
  48 static int
  49 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
  50 {
  51         if (task->tk_status != -EJUKEBOX)
  52                 return 0;
  53         nfs_inc_stats(inode, NFSIOS_DELAY);
  54         task->tk_status = 0;
  55         rpc_restart_call(task);
  56         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  57         return 1;
  58 }
  59
  60 static int
  61 do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
  62                  struct nfs_fsinfo *info)
  63 {
  64         struct rpc_message msg = {
  65                 .rpc_proc       = &nfs3_procedures[NFS3PROC_FSINFO],
  66                 .rpc_argp       = fhandle,
  67                 .rpc_resp       = info,
  68         };
  69         int     status;
  70
  71         dprintk("%s: call  fsinfo\n", __func__);
  72         nfs_fattr_init(info->fattr);
  73         status = rpc_call_sync(client, &msg, 0);
  74         dprintk("%s: reply fsinfo: %d\n", __func__, status);
  75         if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
  76                 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
  77                 msg.rpc_resp = info->fattr;
  78                 status = rpc_call_sync(client, &msg, 0);
  79                 dprintk("%s: reply getattr: %d\n", __func__, status);
  80         }
  81         return status;
  82 }
  83
  84 /*
  85  * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
  86  */
  87 static int
  88 nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  89                    struct nfs_fsinfo *info)
  90 {
  91         int     status;
  92
  93         status = do_proc_get_root(server->client, fhandle, info);
  94         if (status && server->nfs_client->cl_rpcclient != server->client)
  95                 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
  96         return status;
  97 }
  98
  99 /*
 100  * One function for each procedure in the NFS protocol.
 101  */
 102 static int
 103 nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 104                 struct nfs_fattr *fattr, struct inode *inode)
 105 {
 106         struct rpc_message msg = {
 107                 .rpc_proc       = &nfs3_procedures[NFS3PROC_GETATTR],
 108                 .rpc_argp       = fhandle,
 109                 .rpc_resp       = fattr,
 110         };
 111         int     status;
 112         unsigned short task_flags = 0;
 113
 114         /* Is this is an attribute revalidation, subject to softreval? */
 115         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
 116                 task_flags |= RPC_TASK_TIMEOUT;
 117
 118         dprintk("NFS call  getattr\n");
 119         nfs_fattr_init(fattr);
 120         status = rpc_call_sync(server->client, &msg, task_flags);
 121         dprintk("NFS reply getattr: %d\n", status);
 122         return status;
 123 }
 124
 125 static int
 126 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 127                         struct iattr *sattr)
 128 {
 129         struct inode *inode = d_inode(dentry);
 130         struct nfs3_sattrargs   arg = {
 131                 .fh             = NFS_FH(inode),
 132                 .sattr          = sattr,
 133         };
 134         struct rpc_message msg = {
 135                 .rpc_proc       = &nfs3_procedures[NFS3PROC_SETATTR],
 136                 .rpc_argp       = &arg,
 137                 .rpc_resp       = fattr,
 138         };
 139         int     status;
 140
 141         dprintk("NFS call  setattr\n");
 142         if (sattr->ia_valid & ATTR_FILE)
 143                 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 144         nfs_fattr_init(fattr);
 145         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 146         if (status == 0) {
 147                 nfs_setattr_update_inode(inode, sattr, fattr);
 148                 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
 149                         nfs_zap_acl_cache(inode);
 150         }
 151         dprintk("NFS reply setattr: %d\n", status);
 152         return status;
 153 }
 154
 155 static int
 156 __nfs3_proc_lookup(struct inode *dir, const char *name, size_t len,
 157                    struct nfs_fh *fhandle, struct nfs_fattr *fattr,
 158                    unsigned short task_flags)
 159 {
 160         struct nfs3_diropargs   arg = {
 161                 .fh             = NFS_FH(dir),
 162                 .name           = name,
 163                 .len            = len
 164         };
 165         struct nfs3_diropres    res = {
 166                 .fh             = fhandle,
 167                 .fattr          = fattr
 168         };
 169         struct rpc_message msg = {
 170                 .rpc_proc       = &nfs3_procedures[NFS3PROC_LOOKUP],
 171                 .rpc_argp       = &arg,
 172                 .rpc_resp       = &res,
 173         };
 174         int                     status;
 175
 176         res.dir_attr = nfs_alloc_fattr();
 177         if (res.dir_attr == NULL)
 178                 return -ENOMEM;
 179
 180         nfs_fattr_init(fattr);
 181         status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 182         nfs_refresh_inode(dir, res.dir_attr);
 183         if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
 184                 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
 185                 msg.rpc_argp = fhandle;
 186                 msg.rpc_resp = fattr;
 187                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 188         }
 189         nfs_free_fattr(res.dir_attr);
 190         dprintk("NFS reply lookup: %d\n", status);
 191         return status;
 192 }
 193
 194 static int
 195 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
 196                  struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 197 {
 198         unsigned short task_flags = 0;
 199
 200         /* Is this is an attribute revalidation, subject to softreval? */
 201         if (nfs_lookup_is_soft_revalidate(dentry))
 202                 task_flags |= RPC_TASK_TIMEOUT;
 203
 204         dprintk("NFS call  lookup %pd2\n", dentry);
 205         return __nfs3_proc_lookup(dir, dentry->d_name.name,
 206                                   dentry->d_name.len, fhandle, fattr,
 207                                   task_flags);
 208 }
 209
 210 static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
 211                              struct nfs_fattr *fattr)
 212 {
 213         const char dotdot[] = "..";
 214         const size_t len = strlen(dotdot);
 215         unsigned short task_flags = 0;
 216
 217         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
 218                 task_flags |= RPC_TASK_TIMEOUT;
 219
 220         return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
 221                                   task_flags);
 222 }
 223
 224 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
 225                             const struct cred *cred)
 226 {
 227         struct nfs3_accessargs  arg = {
 228                 .fh             = NFS_FH(inode),
 229                 .access         = entry->mask,
 230         };
 231         struct nfs3_accessres   res;
 232         struct rpc_message msg = {
 233                 .rpc_proc       = &nfs3_procedures[NFS3PROC_ACCESS],
 234                 .rpc_argp       = &arg,
 235                 .rpc_resp       = &res,
 236                 .rpc_cred       = cred,
 237         };
 238         int status = -ENOMEM;
 239
 240         dprintk("NFS call  access\n");
 241         res.fattr = nfs_alloc_fattr();
 242         if (res.fattr == NULL)
 243                 goto out;
 244
 245         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 246         nfs_refresh_inode(inode, res.fattr);
 247         if (status == 0)
 248                 nfs_access_set_mask(entry, res.access);
 249         nfs_free_fattr(res.fattr);
 250 out:
 251         dprintk("NFS reply access: %d\n", status);
 252         return status;
 253 }
 254
 255 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
 256                 unsigned int pgbase, unsigned int pglen)
 257 {
 258         struct nfs_fattr        *fattr;
 259         struct nfs3_readlinkargs args = {
 260                 .fh             = NFS_FH(inode),
 261                 .pgbase         = pgbase,
 262                 .pglen          = pglen,
 263                 .pages          = &page
 264         };
 265         struct rpc_message msg = {
 266                 .rpc_proc       = &nfs3_procedures[NFS3PROC_READLINK],
 267                 .rpc_argp       = &args,
 268         };
 269         int status = -ENOMEM;
 270
 271         dprintk("NFS call  readlink\n");
 272         fattr = nfs_alloc_fattr();
 273         if (fattr == NULL)
 274                 goto out;
 275         msg.rpc_resp = fattr;
 276
 277         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 278         nfs_refresh_inode(inode, fattr);
 279         nfs_free_fattr(fattr);
 280 out:
 281         dprintk("NFS reply readlink: %d\n", status);
 282         return status;
 283 }
 284
 285 struct nfs3_createdata {
 286         struct rpc_message msg;
 287         union {
 288                 struct nfs3_createargs create;
 289                 struct nfs3_mkdirargs mkdir;
 290                 struct nfs3_symlinkargs symlink;
 291                 struct nfs3_mknodargs mknod;
 292         } arg;
 293         struct nfs3_diropres res;
 294         struct nfs_fh fh;
 295         struct nfs_fattr fattr;
 296         struct nfs_fattr dir_attr;
 297 };
 298
 299 static struct nfs3_createdata *nfs3_alloc_createdata(void)
 300 {
 301         struct nfs3_createdata *data;
 302
 303         data = kzalloc(sizeof(*data), GFP_KERNEL);
 304         if (data != NULL) {
 305                 data->msg.rpc_argp = &data->arg;
 306                 data->msg.rpc_resp = &data->res;
 307                 data->res.fh = &data->fh;
 308                 data->res.fattr = &data->fattr;
 309                 data->res.dir_attr = &data->dir_attr;
 310                 nfs_fattr_init(data->res.fattr);
 311                 nfs_fattr_init(data->res.dir_attr);
 312         }
 313         return data;
 314 }
 315
 316 static struct dentry *
 317 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
 318 {
 319         int status;
 320
 321         status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
 322         nfs_post_op_update_inode(dir, data->res.dir_attr);
 323         if (status != 0)
 324                 return ERR_PTR(status);
 325
 326         return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
 327 }
 328
 329 static void nfs3_free_createdata(struct nfs3_createdata *data)
 330 {
 331         kfree(data);
 332 }
 333
 334 /*
 335  * Create a regular file.
 336  */
 337 static int
 338 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 339                  int flags)
 340 {
 341         struct posix_acl *default_acl, *acl;
 342         struct nfs3_createdata *data;
 343         struct dentry *d_alias;
 344         int status = -ENOMEM;
 345
 346         dprintk("NFS call  create %pd\n", dentry);
 347
 348         data = nfs3_alloc_createdata();
 349         if (data == NULL)
 350                 goto out;
 351
 352         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
 353         data->arg.create.fh = NFS_FH(dir);
 354         data->arg.create.name = dentry->d_name.name;
 355         data->arg.create.len = dentry->d_name.len;
 356         data->arg.create.sattr = sattr;
 357
 358         data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 359         if (flags & O_EXCL) {
 360                 data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
 361                 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
 362                 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
 363         }
 364
 365         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 366         if (status)
 367                 goto out;
 368
 369         for (;;) {
 370                 d_alias = nfs3_do_create(dir, dentry, data);
 371                 status = PTR_ERR_OR_ZERO(d_alias);
 372
 373                 if (status != -ENOTSUPP)
 374                         break;
 375                 /* If the server doesn't support the exclusive creation
 376                  * semantics, try again with simple 'guarded' mode. */
 377                 switch (data->arg.create.createmode) {
 378                         case NFS3_CREATE_EXCLUSIVE:
 379                                 data->arg.create.createmode = NFS3_CREATE_GUARDED;
 380                                 break;
 381
 382                         case NFS3_CREATE_GUARDED:
 383                                 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 384                                 break;
 385
 386                         case NFS3_CREATE_UNCHECKED:
 387                                 goto out_release_acls;
 388                 }
 389                 nfs_fattr_init(data->res.dir_attr);
 390                 nfs_fattr_init(data->res.fattr);
 391         }
 392
 393         if (status != 0)
 394                 goto out_release_acls;
 395
 396         if (d_alias)
 397                 dentry = d_alias;
 398
 399         /* When we created the file with exclusive semantics, make
 400          * sure we set the attributes afterwards. */
 401         if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
 402                 dprintk("NFS call  setattr (post-create)\n");
 403
 404                 if (!(sattr->ia_valid & ATTR_ATIME_SET))
 405                         sattr->ia_valid |= ATTR_ATIME;
 406                 if (!(sattr->ia_valid & ATTR_MTIME_SET))
 407                         sattr->ia_valid |= ATTR_MTIME;
 408
 409                 /* Note: we could use a guarded setattr here, but I'm
 410                  * not sure this buys us anything (and I'd have
 411                  * to revamp the NFSv3 XDR code) */
 412                 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
 413                 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
 414                 dprintk("NFS reply setattr (post-create): %d\n", status);
 415                 if (status != 0)
 416                         goto out_dput;
 417         }
 418
 419         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 420
 421 out_dput:
 422         dput(d_alias);
 423 out_release_acls:
 424         posix_acl_release(acl);
 425         posix_acl_release(default_acl);
 426 out:
 427         nfs3_free_createdata(data);
 428         dprintk("NFS reply create: %d\n", status);
 429         return status;
 430 }
 431
 432 static int
 433 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
 434 {
 435         struct nfs_removeargs arg = {
 436                 .fh = NFS_FH(dir),
 437                 .name = dentry->d_name,
 438         };
 439         struct nfs_removeres res;
 440         struct rpc_message msg = {
 441                 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
 442                 .rpc_argp = &arg,
 443                 .rpc_resp = &res,
 444         };
 445         int status = -ENOMEM;
 446
 447         dprintk("NFS call  remove %pd2\n", dentry);
 448         res.dir_attr = nfs_alloc_fattr();
 449         if (res.dir_attr == NULL)
 450                 goto out;
 451
 452         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 453         nfs_post_op_update_inode(dir, res.dir_attr);
 454         nfs_free_fattr(res.dir_attr);
 455 out:
 456         dprintk("NFS reply remove: %d\n", status);
 457         return status;
 458 }
 459
 460 static void
 461 nfs3_proc_unlink_setup(struct rpc_message *msg,
 462                 struct dentry *dentry,
 463                 struct inode *inode)
 464 {
 465         msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
 466 }
 467
 468 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 469 {
 470         rpc_call_start(task);
 471 }
 472
 473 static int
 474 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 475 {
 476         struct nfs_removeres *res;
 477         if (nfs3_async_handle_jukebox(task, dir))
 478                 return 0;
 479         res = task->tk_msg.rpc_resp;
 480         nfs_post_op_update_inode(dir, res->dir_attr);
 481         return 1;
 482 }
 483
 484 static void
 485 nfs3_proc_rename_setup(struct rpc_message *msg,
 486                 struct dentry *old_dentry,
 487                 struct dentry *new_dentry)
 488 {
 489         msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
 490 }
 491
 492 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 493 {
 494         rpc_call_start(task);
 495 }
 496
 497 static int
 498 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 499                       struct inode *new_dir)
 500 {
 501         struct nfs_renameres *res;
 502
 503         if (nfs3_async_handle_jukebox(task, old_dir))
 504                 return 0;
 505         res = task->tk_msg.rpc_resp;
 506
 507         nfs_post_op_update_inode(old_dir, res->old_fattr);
 508         nfs_post_op_update_inode(new_dir, res->new_fattr);
 509         return 1;
 510 }
 511
 512 static int
 513 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
 514 {
 515         struct nfs3_linkargs    arg = {
 516                 .fromfh         = NFS_FH(inode),
 517                 .tofh           = NFS_FH(dir),
 518                 .toname         = name->name,
 519                 .tolen          = name->len
 520         };
 521         struct nfs3_linkres     res;
 522         struct rpc_message msg = {
 523                 .rpc_proc       = &nfs3_procedures[NFS3PROC_LINK],
 524                 .rpc_argp       = &arg,
 525                 .rpc_resp       = &res,
 526         };
 527         int status = -ENOMEM;
 528
 529         dprintk("NFS call  link %s\n", name->name);
 530         res.fattr = nfs_alloc_fattr();
 531         res.dir_attr = nfs_alloc_fattr();
 532         if (res.fattr == NULL || res.dir_attr == NULL)
 533                 goto out;
 534
 535         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 536         nfs_post_op_update_inode(dir, res.dir_attr);
 537         nfs_post_op_update_inode(inode, res.fattr);
 538 out:
 539         nfs_free_fattr(res.dir_attr);
 540         nfs_free_fattr(res.fattr);
 541         dprintk("NFS reply link: %d\n", status);
 542         return status;
 543 }
 544
 545 static int
 546 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
 547                   unsigned int len, struct iattr *sattr)
 548 {
 549         struct page *page = &folio->page;
 550         struct nfs3_createdata *data;
 551         struct dentry *d_alias;
 552         int status = -ENOMEM;
 553
 554         if (len > NFS3_MAXPATHLEN)
 555                 return -ENAMETOOLONG;
 556
 557         dprintk("NFS call  symlink %pd\n", dentry);
 558
 559         data = nfs3_alloc_createdata();
 560         if (data == NULL)
 561                 goto out;
 562         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
 563         data->arg.symlink.fromfh = NFS_FH(dir);
 564         data->arg.symlink.fromname = dentry->d_name.name;
 565         data->arg.symlink.fromlen = dentry->d_name.len;
 566         data->arg.symlink.pages = &page;
 567         data->arg.symlink.pathlen = len;
 568         data->arg.symlink.sattr = sattr;
 569
 570         d_alias = nfs3_do_create(dir, dentry, data);
 571         status = PTR_ERR_OR_ZERO(d_alias);
 572
 573         if (status == 0)
 574                 dput(d_alias);
 575
 576         nfs3_free_createdata(data);
 577 out:
 578         dprintk("NFS reply symlink: %d\n", status);
 579         return status;
 580 }
 581
 582 static int
 583 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 584 {
 585         struct posix_acl *default_acl, *acl;
 586         struct nfs3_createdata *data;
 587         struct dentry *d_alias;
 588         int status = -ENOMEM;
 589
 590         dprintk("NFS call  mkdir %pd\n", dentry);
 591
 592         data = nfs3_alloc_createdata();
 593         if (data == NULL)
 594                 goto out;
 595
 596         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 597         if (status)
 598                 goto out;
 599
 600         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
 601         data->arg.mkdir.fh = NFS_FH(dir);
 602         data->arg.mkdir.name = dentry->d_name.name;
 603         data->arg.mkdir.len = dentry->d_name.len;
 604         data->arg.mkdir.sattr = sattr;
 605
 606         d_alias = nfs3_do_create(dir, dentry, data);
 607         status = PTR_ERR_OR_ZERO(d_alias);
 608
 609         if (status != 0)
 610                 goto out_release_acls;
 611
 612         if (d_alias)
 613                 dentry = d_alias;
 614
 615         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 616
 617         dput(d_alias);
 618 out_release_acls:
 619         posix_acl_release(acl);
 620         posix_acl_release(default_acl);
 621 out:
 622         nfs3_free_createdata(data);
 623         dprintk("NFS reply mkdir: %d\n", status);
 624         return status;
 625 }
 626
 627 static int
 628 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
 629 {
 630         struct nfs_fattr        *dir_attr;
 631         struct nfs3_diropargs   arg = {
 632                 .fh             = NFS_FH(dir),
 633                 .name           = name->name,
 634                 .len            = name->len
 635         };
 636         struct rpc_message msg = {
 637                 .rpc_proc       = &nfs3_procedures[NFS3PROC_RMDIR],
 638                 .rpc_argp       = &arg,
 639         };
 640         int status = -ENOMEM;
 641
 642         dprintk("NFS call  rmdir %s\n", name->name);
 643         dir_attr = nfs_alloc_fattr();
 644         if (dir_attr == NULL)
 645                 goto out;
 646
 647         msg.rpc_resp = dir_attr;
 648         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 649         nfs_post_op_update_inode(dir, dir_attr);
 650         nfs_free_fattr(dir_attr);
 651 out:
 652         dprintk("NFS reply rmdir: %d\n", status);
 653         return status;
 654 }
 655
 656 /*
 657  * The READDIR implementation is somewhat hackish - we pass the user buffer
 658  * to the encode function, which installs it in the receive iovec.
 659  * The decode function itself doesn't perform any decoding, it just makes
 660  * sure the reply is syntactically correct.
 661  *
 662  * Also note that this implementation handles both plain readdir and
 663  * readdirplus.
 664  */
 665 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
 666                              struct nfs_readdir_res *nr_res)
 667 {
 668         struct inode            *dir = d_inode(nr_arg->dentry);
 669         struct nfs3_readdirargs arg = {
 670                 .fh             = NFS_FH(dir),
 671                 .cookie         = nr_arg->cookie,
 672                 .plus           = nr_arg->plus,
 673                 .count          = nr_arg->page_len,
 674                 .pages          = nr_arg->pages
 675         };
 676         struct nfs3_readdirres  res = {
 677                 .verf           = nr_res->verf,
 678                 .plus           = nr_arg->plus,
 679         };
 680         struct rpc_message      msg = {
 681                 .rpc_proc       = &nfs3_procedures[NFS3PROC_READDIR],
 682                 .rpc_argp       = &arg,
 683                 .rpc_resp       = &res,
 684                 .rpc_cred       = nr_arg->cred,
 685         };
 686         int status = -ENOMEM;
 687
 688         if (nr_arg->plus)
 689                 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
 690         if (arg.cookie)
 691                 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
 692
 693         dprintk("NFS call  readdir%s %llu\n", nr_arg->plus ? "plus" : "",
 694                 (unsigned long long)nr_arg->cookie);
 695
 696         res.dir_attr = nfs_alloc_fattr();
 697         if (res.dir_attr == NULL)
 698                 goto out;
 699
 700         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 701
 702         nfs_invalidate_atime(dir);
 703         nfs_refresh_inode(dir, res.dir_attr);
 704
 705         nfs_free_fattr(res.dir_attr);
 706 out:
 707         dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
 708                 status);
 709         return status;
 710 }
 711
 712 static int
 713 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 714                 dev_t rdev)
 715 {
 716         struct posix_acl *default_acl, *acl;
 717         struct nfs3_createdata *data;
 718         struct dentry *d_alias;
 719         int status = -ENOMEM;
 720
 721         dprintk("NFS call  mknod %pd %u:%u\n", dentry,
 722                         MAJOR(rdev), MINOR(rdev));
 723
 724         data = nfs3_alloc_createdata();
 725         if (data == NULL)
 726                 goto out;
 727
 728         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 729         if (status)
 730                 goto out;
 731
 732         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
 733         data->arg.mknod.fh = NFS_FH(dir);
 734         data->arg.mknod.name = dentry->d_name.name;
 735         data->arg.mknod.len = dentry->d_name.len;
 736         data->arg.mknod.sattr = sattr;
 737         data->arg.mknod.rdev = rdev;
 738
 739         switch (sattr->ia_mode & S_IFMT) {
 740         case S_IFBLK:
 741                 data->arg.mknod.type = NF3BLK;
 742                 break;
 743         case S_IFCHR:
 744                 data->arg.mknod.type = NF3CHR;
 745                 break;
 746         case S_IFIFO:
 747                 data->arg.mknod.type = NF3FIFO;
 748                 break;
 749         case S_IFSOCK:
 750                 data->arg.mknod.type = NF3SOCK;
 751                 break;
 752         default:
 753                 status = -EINVAL;
 754                 goto out_release_acls;
 755         }
 756
 757         d_alias = nfs3_do_create(dir, dentry, data);
 758         status = PTR_ERR_OR_ZERO(d_alias);
 759         if (status != 0)
 760                 goto out_release_acls;
 761
 762         if (d_alias)
 763                 dentry = d_alias;
 764
 765         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 766
 767         dput(d_alias);
 768 out_release_acls:
 769         posix_acl_release(acl);
 770         posix_acl_release(default_acl);
 771 out:
 772         nfs3_free_createdata(data);
 773         dprintk("NFS reply mknod: %d\n", status);
 774         return status;
 775 }
 776
 777 static int
 778 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 779                  struct nfs_fsstat *stat)
 780 {
 781         struct rpc_message msg = {
 782                 .rpc_proc       = &nfs3_procedures[NFS3PROC_FSSTAT],
 783                 .rpc_argp       = fhandle,
 784                 .rpc_resp       = stat,
 785         };
 786         int     status;
 787
 788         dprintk("NFS call  fsstat\n");
 789         nfs_fattr_init(stat->fattr);
 790         status = rpc_call_sync(server->client, &msg, 0);
 791         dprintk("NFS reply fsstat: %d\n", status);
 792         return status;
 793 }
 794
 795 static int
 796 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
 797                  struct nfs_fsinfo *info)
 798 {
 799         struct rpc_message msg = {
 800                 .rpc_proc       = &nfs3_procedures[NFS3PROC_FSINFO],
 801                 .rpc_argp       = fhandle,
 802                 .rpc_resp       = info,
 803         };
 804         int     status;
 805
 806         dprintk("NFS call  fsinfo\n");
 807         nfs_fattr_init(info->fattr);
 808         status = rpc_call_sync(client, &msg, 0);
 809         dprintk("NFS reply fsinfo: %d\n", status);
 810         return status;
 811 }
 812
 813 /*
 814  * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
 815  * nfs_create_server
 816  */
 817 static int
 818 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 819                    struct nfs_fsinfo *info)
 820 {
 821         int     status;
 822
 823         status = do_proc_fsinfo(server->client, fhandle, info);
 824         if (status && server->nfs_client->cl_rpcclient != server->client)
 825                 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
 826         return status;
 827 }
 828
 829 static int
 830 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 831                    struct nfs_pathconf *info)
 832 {
 833         struct rpc_message msg = {
 834                 .rpc_proc       = &nfs3_procedures[NFS3PROC_PATHCONF],
 835                 .rpc_argp       = fhandle,
 836                 .rpc_resp       = info,
 837         };
 838         int     status;
 839
 840         dprintk("NFS call  pathconf\n");
 841         nfs_fattr_init(info->fattr);
 842         status = rpc_call_sync(server->client, &msg, 0);
 843         dprintk("NFS reply pathconf: %d\n", status);
 844         return status;
 845 }
 846
 847 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 848 {
 849         struct inode *inode = hdr->inode;
 850         struct nfs_server *server = NFS_SERVER(inode);
 851
 852         if (hdr->pgio_done_cb != NULL)
 853                 return hdr->pgio_done_cb(task, hdr);
 854
 855         if (nfs3_async_handle_jukebox(task, inode))
 856                 return -EAGAIN;
 857
 858         if (task->tk_status >= 0 && !server->read_hdrsize)
 859                 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
 860
 861         nfs_invalidate_atime(inode);
 862         nfs_refresh_inode(inode, &hdr->fattr);
 863         return 0;
 864 }
 865
 866 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
 867                                  struct rpc_message *msg)
 868 {
 869         msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
 870         hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
 871 }
 872
 873 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
 874                                       struct nfs_pgio_header *hdr)
 875 {
 876         rpc_call_start(task);
 877         return 0;
 878 }
 879
 880 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 881 {
 882         struct inode *inode = hdr->inode;
 883
 884         if (hdr->pgio_done_cb != NULL)
 885                 return hdr->pgio_done_cb(task, hdr);
 886
 887         if (nfs3_async_handle_jukebox(task, inode))
 888                 return -EAGAIN;
 889         if (task->tk_status >= 0)
 890                 nfs_writeback_update_inode(hdr);
 891         return 0;
 892 }
 893
 894 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
 895                                   struct rpc_message *msg,
 896                                   struct rpc_clnt **clnt)
 897 {
 898         msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
 899 }
 900
 901 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 902 {
 903         rpc_call_start(task);
 904 }
 905
 906 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
 907 {
 908         if (data->commit_done_cb != NULL)
 909                 return data->commit_done_cb(task, data);
 910
 911         if (nfs3_async_handle_jukebox(task, data->inode))
 912                 return -EAGAIN;
 913         nfs_refresh_inode(data->inode, data->res.fattr);
 914         return 0;
 915 }
 916
 917 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
 918                                    struct rpc_clnt **clnt)
 919 {
 920         msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
 921 }
 922
 923 static void nfs3_nlm_alloc_call(void *data)
 924 {
 925         struct nfs_lock_context *l_ctx = data;
 926         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 927                 get_nfs_open_context(l_ctx->open_context);
 928                 nfs_get_lock_context(l_ctx->open_context);
 929         }
 930 }
 931
 932 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
 933 {
 934         struct nfs_lock_context *l_ctx = data;
 935         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
 936                 return nfs_async_iocounter_wait(task, l_ctx);
 937         return false;
 938
 939 }
 940
 941 static void nfs3_nlm_release_call(void *data)
 942 {
 943         struct nfs_lock_context *l_ctx = data;
 944         struct nfs_open_context *ctx;
 945         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 946                 ctx = l_ctx->open_context;
 947                 nfs_put_lock_context(l_ctx);
 948                 put_nfs_open_context(ctx);
 949         }
 950 }
 951
 952 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
 953         .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
 954         .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
 955         .nlmclnt_release_call = nfs3_nlm_release_call,
 956 };
 957
 958 static int
 959 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 960 {
 961         struct inode *inode = file_inode(filp);
 962         struct nfs_lock_context *l_ctx = NULL;
 963         struct nfs_open_context *ctx = nfs_file_open_context(filp);
 964         int status;
 965
 966         if (fl->c.flc_flags & FL_CLOSE) {
 967                 l_ctx = nfs_get_lock_context(ctx);
 968                 if (IS_ERR(l_ctx))
 969                         l_ctx = NULL;
 970                 else
 971                         set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
 972         }
 973
 974         status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
 975
 976         if (l_ctx)
 977                 nfs_put_lock_context(l_ctx);
 978
 979         return status;
 980 }
 981
 982 static int nfs3_have_delegation(struct inode *inode, fmode_t type, int flags)
 983 {
 984         return 0;
 985 }
 986
 987 static int nfs3_return_delegation(struct inode *inode)
 988 {
 989         if (S_ISREG(inode->i_mode))
 990                 nfs_wb_all(inode);
 991         return 0;
 992 }
 993
 994 static const struct inode_operations nfs3_dir_inode_operations = {
 995         .create         = nfs_create,
 996         .atomic_open    = nfs_atomic_open_v23,
 997         .lookup         = nfs_lookup,
 998         .link           = nfs_link,
 999         .unlink         = nfs_unlink,
1000         .symlink        = nfs_symlink,
1001         .mkdir          = nfs_mkdir,
1002         .rmdir          = nfs_rmdir,
1003         .mknod          = nfs_mknod,
1004         .rename         = nfs_rename,
1005         .permission     = nfs_permission,
1006         .getattr        = nfs_getattr,
1007         .setattr        = nfs_setattr,
1008 #ifdef CONFIG_NFS_V3_ACL
1009         .listxattr      = nfs3_listxattr,
1010         .get_inode_acl  = nfs3_get_acl,
1011         .set_acl        = nfs3_set_acl,
1012 #endif
1013 };
1014
1015 static const struct inode_operations nfs3_file_inode_operations = {
1016         .permission     = nfs_permission,
1017         .getattr        = nfs_getattr,
1018         .setattr        = nfs_setattr,
1019 #ifdef CONFIG_NFS_V3_ACL
1020         .listxattr      = nfs3_listxattr,
1021         .get_inode_acl  = nfs3_get_acl,
1022         .set_acl        = nfs3_set_acl,
1023 #endif
1024 };
1025
1026 const struct nfs_rpc_ops nfs_v3_clientops = {
1027         .version        = 3,                    /* protocol version */
1028         .dentry_ops     = &nfs_dentry_operations,
1029         .dir_inode_ops  = &nfs3_dir_inode_operations,
1030         .file_inode_ops = &nfs3_file_inode_operations,
1031         .file_ops       = &nfs_file_operations,
1032         .nlmclnt_ops    = &nlmclnt_fl_close_lock_ops,
1033         .getroot        = nfs3_proc_get_root,
1034         .submount       = nfs_submount,
1035         .try_get_tree   = nfs_try_get_tree,
1036         .getattr        = nfs3_proc_getattr,
1037         .setattr        = nfs3_proc_setattr,
1038         .lookup         = nfs3_proc_lookup,
1039         .lookupp        = nfs3_proc_lookupp,
1040         .access         = nfs3_proc_access,
1041         .readlink       = nfs3_proc_readlink,
1042         .create         = nfs3_proc_create,
1043         .remove         = nfs3_proc_remove,
1044         .unlink_setup   = nfs3_proc_unlink_setup,
1045         .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1046         .unlink_done    = nfs3_proc_unlink_done,
1047         .rename_setup   = nfs3_proc_rename_setup,
1048         .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1049         .rename_done    = nfs3_proc_rename_done,
1050         .link           = nfs3_proc_link,
1051         .symlink        = nfs3_proc_symlink,
1052         .mkdir          = nfs3_proc_mkdir,
1053         .rmdir          = nfs3_proc_rmdir,
1054         .readdir        = nfs3_proc_readdir,
1055         .mknod          = nfs3_proc_mknod,
1056         .statfs         = nfs3_proc_statfs,
1057         .fsinfo         = nfs3_proc_fsinfo,
1058         .pathconf       = nfs3_proc_pathconf,
1059         .decode_dirent  = nfs3_decode_dirent,
1060         .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1061         .read_setup     = nfs3_proc_read_setup,
1062         .read_done      = nfs3_read_done,
1063         .write_setup    = nfs3_proc_write_setup,
1064         .write_done     = nfs3_write_done,
1065         .commit_setup   = nfs3_proc_commit_setup,
1066         .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1067         .commit_done    = nfs3_commit_done,
1068         .lock           = nfs3_proc_lock,
1069         .clear_acl_cache = forget_all_cached_acls,
1070         .close_context  = nfs_close_context,
1071         .have_delegation = nfs3_have_delegation,
1072         .return_delegation = nfs3_return_delegation,
1073         .alloc_client   = nfs_alloc_client,
1074         .init_client    = nfs_init_client,
1075         .free_client    = nfs_free_client,
1076         .create_server  = nfs3_create_server,
1077         .clone_server   = nfs3_clone_server,
1078 };