davinci: cp_intc: provide set_wake function
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / proc.c
blobef583854d8d03c77864c7d68d7cb3af3c88cfa47
1 /*
2 * linux/fs/nfs/proc.c
4 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
6 * OS-independent nfs remote procedure call functions
8 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
9 * so at last we can have decent(ish) throughput off a
10 * Sun server.
12 * Coding optimized and cleaned up by Florian La Roche.
13 * Note: Error returns are optimized for NFS_OK, which isn't translated via
14 * nfs_stat_to_errno(), but happens to be already the right return code.
16 * Also, the code currently doesn't check the size of the packet, when
17 * it decodes the packet.
19 * Feel free to fix it and mail me the diffs if it worries you.
21 * Completely rewritten to support the new RPC call interface;
22 * rewrote and moved the entire XDR stuff to xdr.c
23 * --Olaf Kirch June 1996
25 * The code below initializes all auto variables explicitly, otherwise
26 * it will fail to work as a module (gcc generates a memset call for an
27 * incomplete struct).
30 #include <linux/types.h>
31 #include <linux/param.h>
32 #include <linux/slab.h>
33 #include <linux/time.h>
34 #include <linux/mm.h>
35 #include <linux/errno.h>
36 #include <linux/string.h>
37 #include <linux/in.h>
38 #include <linux/pagemap.h>
39 #include <linux/sunrpc/clnt.h>
40 #include <linux/nfs.h>
41 #include <linux/nfs2.h>
42 #include <linux/nfs_fs.h>
43 #include <linux/nfs_page.h>
44 #include <linux/lockd/bind.h>
45 #include "internal.h"
47 #define NFSDBG_FACILITY NFSDBG_PROC
50 * Bare-bones access to getattr: this is for nfs_read_super.
52 static int
53 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54 struct nfs_fsinfo *info)
56 struct nfs_fattr *fattr = info->fattr;
57 struct nfs2_fsstat fsinfo;
58 struct rpc_message msg = {
59 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
60 .rpc_argp = fhandle,
61 .rpc_resp = fattr,
63 int status;
65 dprintk("%s: call getattr\n", __func__);
66 nfs_fattr_init(fattr);
67 status = rpc_call_sync(server->client, &msg, 0);
68 /* Retry with default authentication if different */
69 if (status && server->nfs_client->cl_rpcclient != server->client)
70 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
71 dprintk("%s: reply getattr: %d\n", __func__, status);
72 if (status)
73 return status;
74 dprintk("%s: call statfs\n", __func__);
75 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
76 msg.rpc_resp = &fsinfo;
77 status = rpc_call_sync(server->client, &msg, 0);
78 /* Retry with default authentication if different */
79 if (status && server->nfs_client->cl_rpcclient != server->client)
80 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
81 dprintk("%s: reply statfs: %d\n", __func__, status);
82 if (status)
83 return status;
84 info->rtmax = NFS_MAXDATA;
85 info->rtpref = fsinfo.tsize;
86 info->rtmult = fsinfo.bsize;
87 info->wtmax = NFS_MAXDATA;
88 info->wtpref = fsinfo.tsize;
89 info->wtmult = fsinfo.bsize;
90 info->dtpref = fsinfo.tsize;
91 info->maxfilesize = 0x7FFFFFFF;
92 info->lease_time = 0;
93 return 0;
97 * One function for each procedure in the NFS protocol.
99 static int
100 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
101 struct nfs_fattr *fattr)
103 struct rpc_message msg = {
104 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
105 .rpc_argp = fhandle,
106 .rpc_resp = fattr,
108 int status;
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;
117 static int
118 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
119 struct iattr *sattr)
121 struct inode *inode = dentry->d_inode;
122 struct nfs_sattrargs arg = {
123 .fh = NFS_FH(inode),
124 .sattr = sattr
126 struct rpc_message msg = {
127 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
128 .rpc_argp = &arg,
129 .rpc_resp = fattr,
131 int status;
133 /* Mask out the non-modebit related stuff from attr->ia_mode */
134 sattr->ia_mode &= S_IALLUGO;
136 dprintk("NFS call setattr\n");
137 if (sattr->ia_valid & ATTR_FILE)
138 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
139 nfs_fattr_init(fattr);
140 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
141 if (status == 0)
142 nfs_setattr_update_inode(inode, sattr);
143 dprintk("NFS reply setattr: %d\n", status);
144 return status;
147 static int
148 nfs_proc_lookup(struct inode *dir, struct qstr *name,
149 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
151 struct nfs_diropargs arg = {
152 .fh = NFS_FH(dir),
153 .name = name->name,
154 .len = name->len
156 struct nfs_diropok res = {
157 .fh = fhandle,
158 .fattr = fattr
160 struct rpc_message msg = {
161 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
162 .rpc_argp = &arg,
163 .rpc_resp = &res,
165 int status;
167 dprintk("NFS call lookup %s\n", name->name);
168 nfs_fattr_init(fattr);
169 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
170 dprintk("NFS reply lookup: %d\n", status);
171 return status;
174 static int nfs_proc_readlink(struct inode *inode, struct page *page,
175 unsigned int pgbase, unsigned int pglen)
177 struct nfs_readlinkargs args = {
178 .fh = NFS_FH(inode),
179 .pgbase = pgbase,
180 .pglen = pglen,
181 .pages = &page
183 struct rpc_message msg = {
184 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
185 .rpc_argp = &args,
187 int status;
189 dprintk("NFS call readlink\n");
190 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
191 dprintk("NFS reply readlink: %d\n", status);
192 return status;
195 static int
196 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
197 int flags, struct nameidata *nd)
199 struct nfs_fh fhandle;
200 struct nfs_fattr fattr;
201 struct nfs_createargs arg = {
202 .fh = NFS_FH(dir),
203 .name = dentry->d_name.name,
204 .len = dentry->d_name.len,
205 .sattr = sattr
207 struct nfs_diropok res = {
208 .fh = &fhandle,
209 .fattr = &fattr
211 struct rpc_message msg = {
212 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
213 .rpc_argp = &arg,
214 .rpc_resp = &res,
216 int status;
218 nfs_fattr_init(&fattr);
219 dprintk("NFS call create %s\n", dentry->d_name.name);
220 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
221 nfs_mark_for_revalidate(dir);
222 if (status == 0)
223 status = nfs_instantiate(dentry, &fhandle, &fattr);
224 dprintk("NFS reply create: %d\n", status);
225 return status;
229 * In NFSv2, mknod is grafted onto the create call.
231 static int
232 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
233 dev_t rdev)
235 struct nfs_fh fhandle;
236 struct nfs_fattr fattr;
237 struct nfs_createargs arg = {
238 .fh = NFS_FH(dir),
239 .name = dentry->d_name.name,
240 .len = dentry->d_name.len,
241 .sattr = sattr
243 struct nfs_diropok res = {
244 .fh = &fhandle,
245 .fattr = &fattr
247 struct rpc_message msg = {
248 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
249 .rpc_argp = &arg,
250 .rpc_resp = &res,
252 int status, mode;
254 dprintk("NFS call mknod %s\n", dentry->d_name.name);
256 mode = sattr->ia_mode;
257 if (S_ISFIFO(mode)) {
258 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
259 sattr->ia_valid &= ~ATTR_SIZE;
260 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
261 sattr->ia_valid |= ATTR_SIZE;
262 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
265 nfs_fattr_init(&fattr);
266 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
267 nfs_mark_for_revalidate(dir);
269 if (status == -EINVAL && S_ISFIFO(mode)) {
270 sattr->ia_mode = mode;
271 nfs_fattr_init(&fattr);
272 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
274 if (status == 0)
275 status = nfs_instantiate(dentry, &fhandle, &fattr);
276 dprintk("NFS reply mknod: %d\n", status);
277 return status;
280 static int
281 nfs_proc_remove(struct inode *dir, struct qstr *name)
283 struct nfs_removeargs arg = {
284 .fh = NFS_FH(dir),
285 .name.len = name->len,
286 .name.name = name->name,
288 struct rpc_message msg = {
289 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
290 .rpc_argp = &arg,
292 int status;
294 dprintk("NFS call remove %s\n", name->name);
295 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
296 nfs_mark_for_revalidate(dir);
298 dprintk("NFS reply remove: %d\n", status);
299 return status;
302 static void
303 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
305 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
308 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
310 nfs_mark_for_revalidate(dir);
311 return 1;
314 static int
315 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
316 struct inode *new_dir, struct qstr *new_name)
318 struct nfs_renameargs arg = {
319 .fromfh = NFS_FH(old_dir),
320 .fromname = old_name->name,
321 .fromlen = old_name->len,
322 .tofh = NFS_FH(new_dir),
323 .toname = new_name->name,
324 .tolen = new_name->len
326 struct rpc_message msg = {
327 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
328 .rpc_argp = &arg,
330 int status;
332 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
333 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
334 nfs_mark_for_revalidate(old_dir);
335 nfs_mark_for_revalidate(new_dir);
336 dprintk("NFS reply rename: %d\n", status);
337 return status;
340 static int
341 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
343 struct nfs_linkargs arg = {
344 .fromfh = NFS_FH(inode),
345 .tofh = NFS_FH(dir),
346 .toname = name->name,
347 .tolen = name->len
349 struct rpc_message msg = {
350 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
351 .rpc_argp = &arg,
353 int status;
355 dprintk("NFS call link %s\n", name->name);
356 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
357 nfs_mark_for_revalidate(inode);
358 nfs_mark_for_revalidate(dir);
359 dprintk("NFS reply link: %d\n", status);
360 return status;
363 static int
364 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
365 unsigned int len, struct iattr *sattr)
367 struct nfs_fh fhandle;
368 struct nfs_fattr fattr;
369 struct nfs_symlinkargs arg = {
370 .fromfh = NFS_FH(dir),
371 .fromname = dentry->d_name.name,
372 .fromlen = dentry->d_name.len,
373 .pages = &page,
374 .pathlen = len,
375 .sattr = sattr
377 struct rpc_message msg = {
378 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
379 .rpc_argp = &arg,
381 int status;
383 if (len > NFS2_MAXPATHLEN)
384 return -ENAMETOOLONG;
386 dprintk("NFS call symlink %s\n", dentry->d_name.name);
388 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
389 nfs_mark_for_revalidate(dir);
392 * V2 SYMLINK requests don't return any attributes. Setting the
393 * filehandle size to zero indicates to nfs_instantiate that it
394 * should fill in the data with a LOOKUP call on the wire.
396 if (status == 0) {
397 nfs_fattr_init(&fattr);
398 fhandle.size = 0;
399 status = nfs_instantiate(dentry, &fhandle, &fattr);
402 dprintk("NFS reply symlink: %d\n", status);
403 return status;
406 static int
407 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
409 struct nfs_fh fhandle;
410 struct nfs_fattr fattr;
411 struct nfs_createargs arg = {
412 .fh = NFS_FH(dir),
413 .name = dentry->d_name.name,
414 .len = dentry->d_name.len,
415 .sattr = sattr
417 struct nfs_diropok res = {
418 .fh = &fhandle,
419 .fattr = &fattr
421 struct rpc_message msg = {
422 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
423 .rpc_argp = &arg,
424 .rpc_resp = &res,
426 int status;
428 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
429 nfs_fattr_init(&fattr);
430 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
431 nfs_mark_for_revalidate(dir);
432 if (status == 0)
433 status = nfs_instantiate(dentry, &fhandle, &fattr);
434 dprintk("NFS reply mkdir: %d\n", status);
435 return status;
438 static int
439 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
441 struct nfs_diropargs arg = {
442 .fh = NFS_FH(dir),
443 .name = name->name,
444 .len = name->len
446 struct rpc_message msg = {
447 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
448 .rpc_argp = &arg,
450 int status;
452 dprintk("NFS call rmdir %s\n", name->name);
453 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
454 nfs_mark_for_revalidate(dir);
455 dprintk("NFS reply rmdir: %d\n", status);
456 return status;
460 * The READDIR implementation is somewhat hackish - we pass a temporary
461 * buffer to the encode function, which installs it in the receive
462 * the receive iovec. The decode function just parses the reply to make
463 * sure it is syntactically correct; the entries itself are decoded
464 * from nfs_readdir by calling the decode_entry function directly.
466 static int
467 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
468 u64 cookie, struct page *page, unsigned int count, int plus)
470 struct inode *dir = dentry->d_inode;
471 struct nfs_readdirargs arg = {
472 .fh = NFS_FH(dir),
473 .cookie = cookie,
474 .count = count,
475 .pages = &page,
477 struct rpc_message msg = {
478 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
479 .rpc_argp = &arg,
480 .rpc_cred = cred,
482 int status;
484 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
485 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
487 nfs_invalidate_atime(dir);
489 dprintk("NFS reply readdir: %d\n", status);
490 return status;
493 static int
494 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
495 struct nfs_fsstat *stat)
497 struct nfs2_fsstat fsinfo;
498 struct rpc_message msg = {
499 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
500 .rpc_argp = fhandle,
501 .rpc_resp = &fsinfo,
503 int status;
505 dprintk("NFS call statfs\n");
506 nfs_fattr_init(stat->fattr);
507 status = rpc_call_sync(server->client, &msg, 0);
508 dprintk("NFS reply statfs: %d\n", status);
509 if (status)
510 goto out;
511 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
512 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
513 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
514 stat->tfiles = 0;
515 stat->ffiles = 0;
516 stat->afiles = 0;
517 out:
518 return status;
521 static int
522 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
523 struct nfs_fsinfo *info)
525 struct nfs2_fsstat fsinfo;
526 struct rpc_message msg = {
527 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
528 .rpc_argp = fhandle,
529 .rpc_resp = &fsinfo,
531 int status;
533 dprintk("NFS call fsinfo\n");
534 nfs_fattr_init(info->fattr);
535 status = rpc_call_sync(server->client, &msg, 0);
536 dprintk("NFS reply fsinfo: %d\n", status);
537 if (status)
538 goto out;
539 info->rtmax = NFS_MAXDATA;
540 info->rtpref = fsinfo.tsize;
541 info->rtmult = fsinfo.bsize;
542 info->wtmax = NFS_MAXDATA;
543 info->wtpref = fsinfo.tsize;
544 info->wtmult = fsinfo.bsize;
545 info->dtpref = fsinfo.tsize;
546 info->maxfilesize = 0x7FFFFFFF;
547 info->lease_time = 0;
548 out:
549 return status;
552 static int
553 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
554 struct nfs_pathconf *info)
556 info->max_link = 0;
557 info->max_namelen = NFS2_MAXNAMLEN;
558 return 0;
561 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
563 nfs_invalidate_atime(data->inode);
564 if (task->tk_status >= 0) {
565 nfs_refresh_inode(data->inode, data->res.fattr);
566 /* Emulate the eof flag, which isn't normally needed in NFSv2
567 * as it is guaranteed to always return the file attributes
569 if (data->args.offset + data->args.count >= data->res.fattr->size)
570 data->res.eof = 1;
572 return 0;
575 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
577 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
580 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
582 if (task->tk_status >= 0)
583 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
584 return 0;
587 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
589 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
590 data->args.stable = NFS_FILE_SYNC;
591 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
594 static void
595 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
597 BUG();
600 static int
601 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
603 struct inode *inode = filp->f_path.dentry->d_inode;
605 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
608 /* Helper functions for NFS lock bounds checking */
609 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
610 static int nfs_lock_check_bounds(const struct file_lock *fl)
612 __s32 start, end;
614 start = (__s32)fl->fl_start;
615 if ((loff_t)start != fl->fl_start)
616 goto out_einval;
618 if (fl->fl_end != OFFSET_MAX) {
619 end = (__s32)fl->fl_end;
620 if ((loff_t)end != fl->fl_end)
621 goto out_einval;
622 } else
623 end = NFS_LOCK32_OFFSET_MAX;
625 if (start < 0 || start > end)
626 goto out_einval;
627 return 0;
628 out_einval:
629 return -EINVAL;
632 const struct nfs_rpc_ops nfs_v2_clientops = {
633 .version = 2, /* protocol version */
634 .dentry_ops = &nfs_dentry_operations,
635 .dir_inode_ops = &nfs_dir_inode_operations,
636 .file_inode_ops = &nfs_file_inode_operations,
637 .getroot = nfs_proc_get_root,
638 .getattr = nfs_proc_getattr,
639 .setattr = nfs_proc_setattr,
640 .lookup = nfs_proc_lookup,
641 .access = NULL, /* access */
642 .readlink = nfs_proc_readlink,
643 .create = nfs_proc_create,
644 .remove = nfs_proc_remove,
645 .unlink_setup = nfs_proc_unlink_setup,
646 .unlink_done = nfs_proc_unlink_done,
647 .rename = nfs_proc_rename,
648 .link = nfs_proc_link,
649 .symlink = nfs_proc_symlink,
650 .mkdir = nfs_proc_mkdir,
651 .rmdir = nfs_proc_rmdir,
652 .readdir = nfs_proc_readdir,
653 .mknod = nfs_proc_mknod,
654 .statfs = nfs_proc_statfs,
655 .fsinfo = nfs_proc_fsinfo,
656 .pathconf = nfs_proc_pathconf,
657 .decode_dirent = nfs_decode_dirent,
658 .read_setup = nfs_proc_read_setup,
659 .read_done = nfs_read_done,
660 .write_setup = nfs_proc_write_setup,
661 .write_done = nfs_write_done,
662 .commit_setup = nfs_proc_commit_setup,
663 .lock = nfs_proc_lock,
664 .lock_check_bounds = nfs_lock_check_bounds,
665 .close_context = nfs_close_context,