linux/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/errno.h>
  11#include <linux/string.h>
  12#include <linux/sunrpc/clnt.h>
  13#include <linux/slab.h>
  14#include <linux/nfs.h>
  15#include <linux/nfs3.h>
  16#include <linux/nfs_fs.h>
  17#include <linux/nfs_page.h>
  18#include <linux/lockd/bind.h>
  19#include <linux/nfs_mount.h>
  20#include <linux/freezer.h>
  21
  22#include "iostat.h"
  23#include "internal.h"
  24
  25#define NFSDBG_FACILITY         NFSDBG_PROC
  26
  27/* A wrapper to handle the EJUKEBOX and EKEYEXPIRED error messages */
  28static int
  29nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  30{
  31        int res;
  32        do {
  33                res = rpc_call_sync(clnt, msg, flags);
  34                if (res != -EJUKEBOX && res != -EKEYEXPIRED)
  35                        break;
  36                freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
  37                res = -ERESTARTSYS;
  38        } while (!fatal_signal_pending(current));
  39        return res;
  40}
  41
  42#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
  43
  44static int
  45nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
  46{
  47        if (task->tk_status != -EJUKEBOX && task->tk_status != -EKEYEXPIRED)
  48                return 0;
  49        if (task->tk_status == -EJUKEBOX)
  50                nfs_inc_stats(inode, NFSIOS_DELAY);
  51        task->tk_status = 0;
  52        rpc_restart_call(task);
  53        rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  54        return 1;
  55}
  56
  57static int
  58do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
  59                 struct nfs_fsinfo *info)
  60{
  61        struct rpc_message msg = {
  62                .rpc_proc       = &nfs3_procedures[NFS3PROC_FSINFO],
  63                .rpc_argp       = fhandle,
  64                .rpc_resp       = info,
  65        };
  66        int     status;
  67
  68        dprintk("%s: call  fsinfo\n", __func__);
  69        nfs_fattr_init(info->fattr);
  70        status = rpc_call_sync(client, &msg, 0);
  71        dprintk("%s: reply fsinfo: %d\n", __func__, status);
  72        if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
  73                msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
  74                msg.rpc_resp = info->fattr;
  75                status = rpc_call_sync(client, &msg, 0);
  76                dprintk("%s: reply getattr: %d\n", __func__, status);
  77        }
  78        return status;
  79}
  80
  81/*
  82 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
  83 */
  84static int
  85nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  86                   struct nfs_fsinfo *info)
  87{
  88        int     status;
  89
  90        status = do_proc_get_root(server->client, fhandle, info);
  91        if (status && server->nfs_client->cl_rpcclient != server->client)
  92                status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
  93        return status;
  94}
  95
  96/*
  97 * One function for each procedure in the NFS protocol.
  98 */
  99static int
 100nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 101                struct nfs_fattr *fattr)
 102{
 103        struct rpc_message msg = {
 104                .rpc_proc       = &nfs3_procedures[NFS3PROC_GETATTR],
 105                .rpc_argp       = fhandle,
 106                .rpc_resp       = fattr,
 107        };
 108        int     status;
 109
 110        dprintk("NFS call  getattr\n");
 111        nfs_fattr_init(fattr);
 112        status = rpc_call_sync(server->client, &msg, 0);
 113        dprintk("NFS reply getattr: %d\n", status);
 114        return status;
 115}
 116
 117static int
 118nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 119                        struct iattr *sattr)
 120{
 121        struct inode *inode = dentry->d_inode;
 122        struct nfs3_sattrargs   arg = {
 123                .fh             = NFS_FH(inode),
 124                .sattr          = sattr,
 125        };
 126        struct rpc_message msg = {
 127                .rpc_proc       = &nfs3_procedures[NFS3PROC_SETATTR],
 128                .rpc_argp       = &arg,
 129                .rpc_resp       = fattr,
 130        };
 131        int     status;
 132
 133        dprintk("NFS call  setattr\n");
 134        if (sattr->ia_valid & ATTR_FILE)
 135                msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 136        nfs_fattr_init(fattr);
 137        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 138        if (status == 0)
 139                nfs_setattr_update_inode(inode, sattr);
 140        dprintk("NFS reply setattr: %d\n", status);
 141        return status;
 142}
 143
 144static int
 145nfs3_proc_lookup(struct inode *dir, struct qstr *name,
 146                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 147{
 148        struct nfs3_diropargs   arg = {
 149                .fh             = NFS_FH(dir),
 150                .name           = name->name,
 151                .len            = name->len
 152        };
 153        struct nfs3_diropres    res = {
 154                .fh             = fhandle,
 155                .fattr          = fattr
 156        };
 157        struct rpc_message msg = {
 158                .rpc_proc       = &nfs3_procedures[NFS3PROC_LOOKUP],
 159                .rpc_argp       = &arg,
 160                .rpc_resp       = &res,
 161        };
 162        int                     status;
 163
 164        dprintk("NFS call  lookup %s\n", name->name);
 165        res.dir_attr = nfs_alloc_fattr();
 166        if (res.dir_attr == NULL)
 167                return -ENOMEM;
 168
 169        nfs_fattr_init(fattr);
 170        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 171        nfs_refresh_inode(dir, res.dir_attr);
 172        if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
 173                msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
 174                msg.rpc_argp = fhandle;
 175                msg.rpc_resp = fattr;
 176                status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 177        }
 178        nfs_free_fattr(res.dir_attr);
 179        dprintk("NFS reply lookup: %d\n", status);
 180        return status;
 181}
 182
 183static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 184{
 185        struct nfs3_accessargs  arg = {
 186                .fh             = NFS_FH(inode),
 187        };
 188        struct nfs3_accessres   res;
 189        struct rpc_message msg = {
 190                .rpc_proc       = &nfs3_procedures[NFS3PROC_ACCESS],
 191                .rpc_argp       = &arg,
 192                .rpc_resp       = &res,
 193                .rpc_cred       = entry->cred,
 194        };
 195        int mode = entry->mask;
 196        int status = -ENOMEM;
 197
 198        dprintk("NFS call  access\n");
 199
 200        if (mode & MAY_READ)
 201                arg.access |= NFS3_ACCESS_READ;
 202        if (S_ISDIR(inode->i_mode)) {
 203                if (mode & MAY_WRITE)
 204                        arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
 205                if (mode & MAY_EXEC)
 206                        arg.access |= NFS3_ACCESS_LOOKUP;
 207        } else {
 208                if (mode & MAY_WRITE)
 209                        arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
 210                if (mode & MAY_EXEC)
 211                        arg.access |= NFS3_ACCESS_EXECUTE;
 212        }
 213
 214        res.fattr = nfs_alloc_fattr();
 215        if (res.fattr == NULL)
 216                goto out;
 217
 218        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 219        nfs_refresh_inode(inode, res.fattr);
 220        if (status == 0) {
 221                entry->mask = 0;
 222                if (res.access & NFS3_ACCESS_READ)
 223                        entry->mask |= MAY_READ;
 224                if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
 225                        entry->mask |= MAY_WRITE;
 226                if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
 227                        entry->mask |= MAY_EXEC;
 228        }
 229        nfs_free_fattr(res.fattr);
 230out:
 231        dprintk("NFS reply access: %d\n", status);
 232        return status;
 233}
 234
 235static int nfs3_proc_readlink(struct inode *inode, struct page *page,
 236                unsigned int pgbase, unsigned int pglen)
 237{
 238        struct nfs_fattr        *fattr;
 239        struct nfs3_readlinkargs args = {
 240                .fh             = NFS_FH(inode),
 241                .pgbase         = pgbase,
 242                .pglen          = pglen,
 243                .pages          = &page
 244        };
 245        struct rpc_message msg = {
 246                .rpc_proc       = &nfs3_procedures[NFS3PROC_READLINK],
 247                .rpc_argp       = &args,
 248        };
 249        int status = -ENOMEM;
 250
 251        dprintk("NFS call  readlink\n");
 252        fattr = nfs_alloc_fattr();
 253        if (fattr == NULL)
 254                goto out;
 255        msg.rpc_resp = fattr;
 256
 257        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 258        nfs_refresh_inode(inode, fattr);
 259        nfs_free_fattr(fattr);
 260out:
 261        dprintk("NFS reply readlink: %d\n", status);
 262        return status;
 263}
 264
 265struct nfs3_createdata {
 266        struct rpc_message msg;
 267        union {
 268                struct nfs3_createargs create;
 269                struct nfs3_mkdirargs mkdir;
 270                struct nfs3_symlinkargs symlink;
 271                struct nfs3_mknodargs mknod;
 272        } arg;
 273        struct nfs3_diropres res;
 274        struct nfs_fh fh;
 275        struct nfs_fattr fattr;
 276        struct nfs_fattr dir_attr;
 277};
 278
 279static struct nfs3_createdata *nfs3_alloc_createdata(void)
 280{
 281        struct nfs3_createdata *data;
 282
 283        data = kzalloc(sizeof(*data), GFP_KERNEL);
 284        if (data != NULL) {
 285                data->msg.rpc_argp = &data->arg;
 286                data->msg.rpc_resp = &data->res;
 287                data->res.fh = &data->fh;
 288                data->res.fattr = &data->fattr;
 289                data->res.dir_attr = &data->dir_attr;
 290                nfs_fattr_init(data->res.fattr);
 291                nfs_fattr_init(data->res.dir_attr);
 292        }
 293        return data;
 294}
 295
 296static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
 297{
 298        int status;
 299
 300        status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
 301        nfs_post_op_update_inode(dir, data->res.dir_attr);
 302        if (status == 0)
 303                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 304        return status;
 305}
 306
 307static void nfs3_free_createdata(struct nfs3_createdata *data)
 308{
 309        kfree(data);
 310}
 311
 312/*
 313 * Create a regular file.
 314 */
 315static int
 316nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 317                 int flags)
 318{
 319        struct nfs3_createdata *data;
 320        umode_t mode = sattr->ia_mode;
 321        int status = -ENOMEM;
 322
 323        dprintk("NFS call  create %s\n", dentry->d_name.name);
 324
 325        data = nfs3_alloc_createdata();
 326        if (data == NULL)
 327                goto out;
 328
 329        data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
 330        data->arg.create.fh = NFS_FH(dir);
 331        data->arg.create.name = dentry->d_name.name;
 332        data->arg.create.len = dentry->d_name.len;
 333        data->arg.create.sattr = sattr;
 334
 335        data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 336        if (flags & O_EXCL) {
 337                data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
 338                data->arg.create.verifier[0] = jiffies;
 339                data->arg.create.verifier[1] = current->pid;
 340        }
 341
 342        sattr->ia_mode &= ~current_umask();
 343
 344        for (;;) {
 345                status = nfs3_do_create(dir, dentry, data);
 346
 347                if (status != -ENOTSUPP)
 348                        break;
 349                /* If the server doesn't support the exclusive creation
 350                 * semantics, try again with simple 'guarded' mode. */
 351                switch (data->arg.create.createmode) {
 352                        case NFS3_CREATE_EXCLUSIVE:
 353                                data->arg.create.createmode = NFS3_CREATE_GUARDED;
 354                                break;
 355
 356                        case NFS3_CREATE_GUARDED:
 357                                data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 358                                break;
 359
 360                        case NFS3_CREATE_UNCHECKED:
 361                                goto out;
 362                }
 363                nfs_fattr_init(data->res.dir_attr);
 364                nfs_fattr_init(data->res.fattr);
 365        }
 366
 367        if (status != 0)
 368                goto out;
 369
 370        /* When we created the file with exclusive semantics, make
 371         * sure we set the attributes afterwards. */
 372        if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
 373                dprintk("NFS call  setattr (post-create)\n");
 374
 375                if (!(sattr->ia_valid & ATTR_ATIME_SET))
 376                        sattr->ia_valid |= ATTR_ATIME;
 377                if (!(sattr->ia_valid & ATTR_MTIME_SET))
 378                        sattr->ia_valid |= ATTR_MTIME;
 379
 380                /* Note: we could use a guarded setattr here, but I'm
 381                 * not sure this buys us anything (and I'd have
 382                 * to revamp the NFSv3 XDR code) */
 383                status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
 384                nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
 385                dprintk("NFS reply setattr (post-create): %d\n", status);
 386                if (status != 0)
 387                        goto out;
 388        }
 389        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
 390out:
 391        nfs3_free_createdata(data);
 392        dprintk("NFS reply create: %d\n", status);
 393        return status;
 394}
 395
 396static int
 397nfs3_proc_remove(struct inode *dir, struct qstr *name)
 398{
 399        struct nfs_removeargs arg = {
 400                .fh = NFS_FH(dir),
 401                .name = *name,
 402        };
 403        struct nfs_removeres res;
 404        struct rpc_message msg = {
 405                .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
 406                .rpc_argp = &arg,
 407                .rpc_resp = &res,
 408        };
 409        int status = -ENOMEM;
 410
 411        dprintk("NFS call  remove %s\n", name->name);
 412        res.dir_attr = nfs_alloc_fattr();
 413        if (res.dir_attr == NULL)
 414                goto out;
 415
 416        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 417        nfs_post_op_update_inode(dir, res.dir_attr);
 418        nfs_free_fattr(res.dir_attr);
 419out:
 420        dprintk("NFS reply remove: %d\n", status);
 421        return status;
 422}
 423
 424static void
 425nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 426{
 427        msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
 428}
 429
 430static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 431{
 432        rpc_call_start(task);
 433}
 434
 435static int
 436nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 437{
 438        struct nfs_removeres *res;
 439        if (nfs3_async_handle_jukebox(task, dir))
 440                return 0;
 441        res = task->tk_msg.rpc_resp;
 442        nfs_post_op_update_inode(dir, res->dir_attr);
 443        return 1;
 444}
 445
 446static void
 447nfs3_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 448{
 449        msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
 450}
 451
 452static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 453{
 454        rpc_call_start(task);
 455}
 456
 457static int
 458nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 459                      struct inode *new_dir)
 460{
 461        struct nfs_renameres *res;
 462
 463        if (nfs3_async_handle_jukebox(task, old_dir))
 464                return 0;
 465        res = task->tk_msg.rpc_resp;
 466
 467        nfs_post_op_update_inode(old_dir, res->old_fattr);
 468        nfs_post_op_update_inode(new_dir, res->new_fattr);
 469        return 1;
 470}
 471
 472static int
 473nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
 474                 struct inode *new_dir, struct qstr *new_name)
 475{
 476        struct nfs_renameargs   arg = {
 477                .old_dir        = NFS_FH(old_dir),
 478                .old_name       = old_name,
 479                .new_dir        = NFS_FH(new_dir),
 480                .new_name       = new_name,
 481        };
 482        struct nfs_renameres res;
 483        struct rpc_message msg = {
 484                .rpc_proc       = &nfs3_procedures[NFS3PROC_RENAME],
 485                .rpc_argp       = &arg,
 486                .rpc_resp       = &res,
 487        };
 488        int status = -ENOMEM;
 489
 490        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 491
 492        res.old_fattr = nfs_alloc_fattr();
 493        res.new_fattr = nfs_alloc_fattr();
 494        if (res.old_fattr == NULL || res.new_fattr == NULL)
 495                goto out;
 496
 497        status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 498        nfs_post_op_update_inode(old_dir, res.old_fattr);
 499        nfs_post_op_update_inode(new_dir, res.new_fattr);
 500out:
 501        nfs_free_fattr(res.old_fattr);
 502        nfs_free_fattr(res.new_fattr);
 503        dprintk("NFS reply rename: %d\n", status);
 504        return status;
 505}
 506
 507static int
 508nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 509{
 510        struct nfs3_linkargs    arg = {
 511                .fromfh         = NFS_FH(inode),
 512                .tofh           = NFS_FH(dir),
 513                .toname         = name->name,
 514                .tolen          = name->len
 515        };
 516        struct nfs3_linkres     res;
 517        struct rpc_message msg = {
 518                .rpc_proc       = &nfs3_procedures[NFS3PROC_LINK],
 519                .rpc_argp       = &arg,
 520                .rpc_resp       = &res,
 521        };
 522        int status = -ENOMEM;
 523
 524        dprintk("NFS call  link %s\n", name->name);
 525        res.fattr = nfs_alloc_fattr();
 526        res.dir_attr = nfs_alloc_fattr();
 527        if (res.fattr == NULL || res.dir_attr == NULL)
 528                goto out;
 529
 530        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 531        nfs_post_op_update_inode(dir, res.dir_attr);
 532        nfs_post_op_update_inode(inode, res.fattr);
 533out:
 534        nfs_free_fattr(res.dir_attr);
 535        nfs_free_fattr(res.fattr);
 536        dprintk("NFS reply link: %d\n", status);
 537        return status;
 538}
 539
 540static int
 541nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 542                  unsigned int len, struct iattr *sattr)
 543{
 544        struct nfs3_createdata *data;
 545        int status = -ENOMEM;
 546
 547        if (len > NFS3_MAXPATHLEN)
 548                return -ENAMETOOLONG;
 549
 550        dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 551
 552        data = nfs3_alloc_createdata();
 553        if (data == NULL)
 554                goto out;
 555        data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
 556        data->arg.symlink.fromfh = NFS_FH(dir);
 557        data->arg.symlink.fromname = dentry->d_name.name;
 558        data->arg.symlink.fromlen = dentry->d_name.len;
 559        data->arg.symlink.pages = &page;
 560        data->arg.symlink.pathlen = len;
 561        data->arg.symlink.sattr = sattr;
 562
 563        status = nfs3_do_create(dir, dentry, data);
 564
 565        nfs3_free_createdata(data);
 566out:
 567        dprintk("NFS reply symlink: %d\n", status);
 568        return status;
 569}
 570
 571static int
 572nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 573{
 574        struct nfs3_createdata *data;
 575        umode_t mode = sattr->ia_mode;
 576        int status = -ENOMEM;
 577
 578        dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 579
 580        sattr->ia_mode &= ~current_umask();
 581
 582        data = nfs3_alloc_createdata();
 583        if (data == NULL)
 584                goto out;
 585
 586        data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
 587        data->arg.mkdir.fh = NFS_FH(dir);
 588        data->arg.mkdir.name = dentry->d_name.name;
 589        data->arg.mkdir.len = dentry->d_name.len;
 590        data->arg.mkdir.sattr = sattr;
 591
 592        status = nfs3_do_create(dir, dentry, data);
 593        if (status != 0)
 594                goto out;
 595
 596        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
 597out:
 598        nfs3_free_createdata(data);
 599        dprintk("NFS reply mkdir: %d\n", status);
 600        return status;
 601}
 602
 603static int
 604nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
 605{
 606        struct nfs_fattr        *dir_attr;
 607        struct nfs3_diropargs   arg = {
 608                .fh             = NFS_FH(dir),
 609                .name           = name->name,
 610                .len            = name->len
 611        };
 612        struct rpc_message msg = {
 613                .rpc_proc       = &nfs3_procedures[NFS3PROC_RMDIR],
 614                .rpc_argp       = &arg,
 615        };
 616        int status = -ENOMEM;
 617
 618        dprintk("NFS call  rmdir %s\n", name->name);
 619        dir_attr = nfs_alloc_fattr();
 620        if (dir_attr == NULL)
 621                goto out;
 622
 623        msg.rpc_resp = dir_attr;
 624        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 625        nfs_post_op_update_inode(dir, dir_attr);
 626        nfs_free_fattr(dir_attr);
 627out:
 628        dprintk("NFS reply rmdir: %d\n", status);
 629        return status;
 630}
 631
 632/*
 633 * The READDIR implementation is somewhat hackish - we pass the user buffer
 634 * to the encode function, which installs it in the receive iovec.
 635 * The decode function itself doesn't perform any decoding, it just makes
 636 * sure the reply is syntactically correct.
 637 *
 638 * Also note that this implementation handles both plain readdir and
 639 * readdirplus.
 640 */
 641static int
 642nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 643                  u64 cookie, struct page **pages, unsigned int count, int plus)
 644{
 645        struct inode            *dir = dentry->d_inode;
 646        __be32                  *verf = NFS_I(dir)->cookieverf;
 647        struct nfs3_readdirargs arg = {
 648                .fh             = NFS_FH(dir),
 649                .cookie         = cookie,
 650                .verf           = {verf[0], verf[1]},
 651                .plus           = plus,
 652                .count          = count,
 653                .pages          = pages
 654        };
 655        struct nfs3_readdirres  res = {
 656                .verf           = verf,
 657                .plus           = plus
 658        };
 659        struct rpc_message      msg = {
 660                .rpc_proc       = &nfs3_procedures[NFS3PROC_READDIR],
 661                .rpc_argp       = &arg,
 662                .rpc_resp       = &res,
 663                .rpc_cred       = cred
 664        };
 665        int status = -ENOMEM;
 666
 667        if (plus)
 668                msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
 669
 670        dprintk("NFS call  readdir%s %d\n",
 671                        plus? "plus" : "", (unsigned int) cookie);
 672
 673        res.dir_attr = nfs_alloc_fattr();
 674        if (res.dir_attr == NULL)
 675                goto out;
 676
 677        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 678
 679        nfs_invalidate_atime(dir);
 680        nfs_refresh_inode(dir, res.dir_attr);
 681
 682        nfs_free_fattr(res.dir_attr);
 683out:
 684        dprintk("NFS reply readdir%s: %d\n",
 685                        plus? "plus" : "", status);
 686        return status;
 687}
 688
 689static int
 690nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 691                dev_t rdev)
 692{
 693        struct nfs3_createdata *data;
 694        umode_t mode = sattr->ia_mode;
 695        int status = -ENOMEM;
 696
 697        dprintk("NFS call  mknod %s %u:%u\n", dentry->d_name.name,
 698                        MAJOR(rdev), MINOR(rdev));
 699
 700        sattr->ia_mode &= ~current_umask();
 701
 702        data = nfs3_alloc_createdata();
 703        if (data == NULL)
 704                goto out;
 705
 706        data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
 707        data->arg.mknod.fh = NFS_FH(dir);
 708        data->arg.mknod.name = dentry->d_name.name;
 709        data->arg.mknod.len = dentry->d_name.len;
 710        data->arg.mknod.sattr = sattr;
 711        data->arg.mknod.rdev = rdev;
 712
 713        switch (sattr->ia_mode & S_IFMT) {
 714        case S_IFBLK:
 715                data->arg.mknod.type = NF3BLK;
 716                break;
 717        case S_IFCHR:
 718                data->arg.mknod.type = NF3CHR;
 719                break;
 720        case S_IFIFO:
 721                data->arg.mknod.type = NF3FIFO;
 722                break;
 723        case S_IFSOCK:
 724                data->arg.mknod.type = NF3SOCK;
 725                break;
 726        default:
 727                status = -EINVAL;
 728                goto out;
 729        }
 730
 731        status = nfs3_do_create(dir, dentry, data);
 732        if (status != 0)
 733                goto out;
 734        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
 735out:
 736        nfs3_free_createdata(data);
 737        dprintk("NFS reply mknod: %d\n", status);
 738        return status;
 739}
 740
 741static int
 742nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 743                 struct nfs_fsstat *stat)
 744{
 745        struct rpc_message msg = {
 746                .rpc_proc       = &nfs3_procedures[NFS3PROC_FSSTAT],
 747                .rpc_argp       = fhandle,
 748                .rpc_resp       = stat,
 749        };
 750        int     status;
 751
 752        dprintk("NFS call  fsstat\n");
 753        nfs_fattr_init(stat->fattr);
 754        status = rpc_call_sync(server->client, &msg, 0);
 755        dprintk("NFS reply fsstat: %d\n", status);
 756        return status;
 757}
 758
 759static int
 760do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
 761                 struct nfs_fsinfo *info)
 762{
 763        struct rpc_message msg = {
 764                .rpc_proc       = &nfs3_procedures[NFS3PROC_FSINFO],
 765                .rpc_argp       = fhandle,
 766                .rpc_resp       = info,
 767        };
 768        int     status;
 769
 770        dprintk("NFS call  fsinfo\n");
 771        nfs_fattr_init(info->fattr);
 772        status = rpc_call_sync(client, &msg, 0);
 773        dprintk("NFS reply fsinfo: %d\n", status);
 774        return status;
 775}
 776
 777/*
 778 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
 779 * nfs_create_server
 780 */
 781static int
 782nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 783                   struct nfs_fsinfo *info)
 784{
 785        int     status;
 786
 787        status = do_proc_fsinfo(server->client, fhandle, info);
 788        if (status && server->nfs_client->cl_rpcclient != server->client)
 789                status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
 790        return status;
 791}
 792
 793static int
 794nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 795                   struct nfs_pathconf *info)
 796{
 797        struct rpc_message msg = {
 798                .rpc_proc       = &nfs3_procedures[NFS3PROC_PATHCONF],
 799                .rpc_argp       = fhandle,
 800                .rpc_resp       = info,
 801        };
 802        int     status;
 803
 804        dprintk("NFS call  pathconf\n");
 805        nfs_fattr_init(info->fattr);
 806        status = rpc_call_sync(server->client, &msg, 0);
 807        dprintk("NFS reply pathconf: %d\n", status);
 808        return status;
 809}
 810
 811static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
 812{
 813        struct inode *inode = data->header->inode;
 814
 815        if (nfs3_async_handle_jukebox(task, inode))
 816                return -EAGAIN;
 817
 818        nfs_invalidate_atime(inode);
 819        nfs_refresh_inode(inode, &data->fattr);
 820        return 0;
 821}
 822
 823static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 824{
 825        msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
 826}
 827
 828static void nfs3_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 829{
 830        rpc_call_start(task);
 831}
 832
 833static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
 834{
 835        struct inode *inode = data->header->inode;
 836
 837        if (nfs3_async_handle_jukebox(task, inode))
 838                return -EAGAIN;
 839        if (task->tk_status >= 0)
 840                nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 841        return 0;
 842}
 843
 844static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 845{
 846        msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
 847}
 848
 849static void nfs3_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 850{
 851        rpc_call_start(task);
 852}
 853
 854static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 855{
 856        rpc_call_start(task);
 857}
 858
 859static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
 860{
 861        if (nfs3_async_handle_jukebox(task, data->inode))
 862                return -EAGAIN;
 863        nfs_refresh_inode(data->inode, data->res.fattr);
 864        return 0;
 865}
 866
 867static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 868{
 869        msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
 870}
 871
 872static int
 873nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 874{
 875        struct inode *inode = filp->f_path.dentry->d_inode;
 876
 877        return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 878}
 879
 880static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
 881{
 882        return 0;
 883}
 884
 885static int nfs3_return_delegation(struct inode *inode)
 886{
 887        nfs_wb_all(inode);
 888        return 0;
 889}
 890
 891static const struct inode_operations nfs3_dir_inode_operations = {
 892        .create         = nfs_create,
 893        .lookup         = nfs_lookup,
 894        .link           = nfs_link,
 895        .unlink         = nfs_unlink,
 896        .symlink        = nfs_symlink,
 897        .mkdir          = nfs_mkdir,
 898        .rmdir          = nfs_rmdir,
 899        .mknod          = nfs_mknod,
 900        .rename         = nfs_rename,
 901        .permission     = nfs_permission,
 902        .getattr        = nfs_getattr,
 903        .setattr        = nfs_setattr,
 904        .listxattr      = nfs3_listxattr,
 905        .getxattr       = nfs3_getxattr,
 906        .setxattr       = nfs3_setxattr,
 907        .removexattr    = nfs3_removexattr,
 908};
 909
 910static const struct inode_operations nfs3_file_inode_operations = {
 911        .permission     = nfs_permission,
 912        .getattr        = nfs_getattr,
 913        .setattr        = nfs_setattr,
 914        .listxattr      = nfs3_listxattr,
 915        .getxattr       = nfs3_getxattr,
 916        .setxattr       = nfs3_setxattr,
 917        .removexattr    = nfs3_removexattr,
 918};
 919
 920const struct nfs_rpc_ops nfs_v3_clientops = {
 921        .version        = 3,                    /* protocol version */
 922        .dentry_ops     = &nfs_dentry_operations,
 923        .dir_inode_ops  = &nfs3_dir_inode_operations,
 924        .file_inode_ops = &nfs3_file_inode_operations,
 925        .file_ops       = &nfs_file_operations,
 926        .getroot        = nfs3_proc_get_root,
 927        .submount       = nfs_submount,
 928        .try_mount      = nfs_try_mount,
 929        .getattr        = nfs3_proc_getattr,
 930        .setattr        = nfs3_proc_setattr,
 931        .lookup         = nfs3_proc_lookup,
 932        .access         = nfs3_proc_access,
 933        .readlink       = nfs3_proc_readlink,
 934        .create         = nfs3_proc_create,
 935        .remove         = nfs3_proc_remove,
 936        .unlink_setup   = nfs3_proc_unlink_setup,
 937        .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
 938        .unlink_done    = nfs3_proc_unlink_done,
 939        .rename         = nfs3_proc_rename,
 940        .rename_setup   = nfs3_proc_rename_setup,
 941        .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
 942        .rename_done    = nfs3_proc_rename_done,
 943        .link           = nfs3_proc_link,
 944        .symlink        = nfs3_proc_symlink,
 945        .mkdir          = nfs3_proc_mkdir,
 946        .rmdir          = nfs3_proc_rmdir,
 947        .readdir        = nfs3_proc_readdir,
 948        .mknod          = nfs3_proc_mknod,
 949        .statfs         = nfs3_proc_statfs,
 950        .fsinfo         = nfs3_proc_fsinfo,
 951        .pathconf       = nfs3_proc_pathconf,
 952        .decode_dirent  = nfs3_decode_dirent,
 953        .read_setup     = nfs3_proc_read_setup,
 954        .read_pageio_init = nfs_pageio_init_read,
 955        .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
 956        .read_done      = nfs3_read_done,
 957        .write_setup    = nfs3_proc_write_setup,
 958        .write_pageio_init = nfs_pageio_init_write,
 959        .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
 960        .write_done     = nfs3_write_done,
 961        .commit_setup   = nfs3_proc_commit_setup,
 962        .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
 963        .commit_done    = nfs3_commit_done,
 964        .lock           = nfs3_proc_lock,
 965        .clear_acl_cache = nfs3_forget_cached_acls,
 966        .close_context  = nfs_close_context,
 967        .have_delegation = nfs3_have_delegation,
 968        .return_delegation = nfs3_return_delegation,
 969        .alloc_client   = nfs_alloc_client,
 970        .init_client    = nfs_init_client,
 971        .free_client    = nfs_free_client,
 972        .create_server  = nfs3_create_server,
 973        .clone_server   = nfs3_clone_server,
 974};
 975
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