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

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