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
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
30 #include <linux/types.h>
31 #include <linux/param.h>
32 #include <linux/slab.h>
33 #include <linux/time.h>
35 #include <linux/utsname.h>
36 #include <linux/errno.h>
37 #include <linux/string.h>
39 #include <linux/pagemap.h>
40 #include <linux/sunrpc/clnt.h>
41 #include <linux/nfs.h>
42 #include <linux/nfs2.h>
43 #include <linux/nfs_fs.h>
44 #include <linux/nfs_page.h>
45 #include <linux/lockd/bind.h>
46 #include <linux/smp_lock.h>
49 #define NFSDBG_FACILITY NFSDBG_PROC
52 * Bare-bones access to getattr: this is for nfs_read_super.
55 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
56 struct nfs_fsinfo *info)
58 struct nfs_fattr *fattr = info->fattr;
59 struct nfs2_fsstat fsinfo;
60 struct rpc_message msg = {
61 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
67 dprintk("%s: call getattr\n", __FUNCTION__);
68 nfs_fattr_init(fattr);
69 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
70 dprintk("%s: reply getattr: %d\n", __FUNCTION__, status);
73 dprintk("%s: call statfs\n", __FUNCTION__);
74 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
75 msg.rpc_resp = &fsinfo;
76 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
77 dprintk("%s: reply statfs: %d\n", __FUNCTION__, status);
80 info->rtmax = NFS_MAXDATA;
81 info->rtpref = fsinfo.tsize;
82 info->rtmult = fsinfo.bsize;
83 info->wtmax = NFS_MAXDATA;
84 info->wtpref = fsinfo.tsize;
85 info->wtmult = fsinfo.bsize;
86 info->dtpref = fsinfo.tsize;
87 info->maxfilesize = 0x7FFFFFFF;
93 * One function for each procedure in the NFS protocol.
96 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 struct nfs_fattr *fattr)
99 struct rpc_message msg = {
100 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
106 dprintk("NFS call getattr\n");
107 nfs_fattr_init(fattr);
108 status = rpc_call_sync(server->client, &msg, 0);
109 dprintk("NFS reply getattr: %d\n", status);
114 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
117 struct inode *inode = dentry->d_inode;
118 struct nfs_sattrargs arg = {
122 struct rpc_message msg = {
123 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
129 /* Mask out the non-modebit related stuff from attr->ia_mode */
130 sattr->ia_mode &= S_IALLUGO;
132 dprintk("NFS call setattr\n");
133 nfs_fattr_init(fattr);
134 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
136 nfs_setattr_update_inode(inode, sattr);
137 dprintk("NFS reply setattr: %d\n", status);
142 nfs_proc_lookup(struct inode *dir, struct qstr *name,
143 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
145 struct nfs_diropargs arg = {
150 struct nfs_diropok res = {
154 struct rpc_message msg = {
155 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
161 dprintk("NFS call lookup %s\n", name->name);
162 nfs_fattr_init(fattr);
163 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
164 dprintk("NFS reply lookup: %d\n", status);
168 static int nfs_proc_readlink(struct inode *inode, struct page *page,
169 unsigned int pgbase, unsigned int pglen)
171 struct nfs_readlinkargs args = {
177 struct rpc_message msg = {
178 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
183 dprintk("NFS call readlink\n");
184 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
185 dprintk("NFS reply readlink: %d\n", status);
189 static int nfs_proc_read(struct nfs_read_data *rdata)
191 int flags = rdata->flags;
192 struct inode * inode = rdata->inode;
193 struct nfs_fattr * fattr = rdata->res.fattr;
194 struct rpc_message msg = {
195 .rpc_proc = &nfs_procedures[NFSPROC_READ],
196 .rpc_argp = &rdata->args,
197 .rpc_resp = &rdata->res,
198 .rpc_cred = rdata->cred,
202 dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
203 (long long) rdata->args.offset);
204 nfs_fattr_init(fattr);
205 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
207 nfs_refresh_inode(inode, fattr);
208 /* Emulate the eof flag, which isn't normally needed in NFSv2
209 * as it is guaranteed to always return the file attributes
211 if (rdata->args.offset + rdata->args.count >= fattr->size)
214 dprintk("NFS reply read: %d\n", status);
218 static int nfs_proc_write(struct nfs_write_data *wdata)
220 int flags = wdata->flags;
221 struct inode * inode = wdata->inode;
222 struct nfs_fattr * fattr = wdata->res.fattr;
223 struct rpc_message msg = {
224 .rpc_proc = &nfs_procedures[NFSPROC_WRITE],
225 .rpc_argp = &wdata->args,
226 .rpc_resp = &wdata->res,
227 .rpc_cred = wdata->cred,
231 dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
232 (long long) wdata->args.offset);
233 nfs_fattr_init(fattr);
234 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
236 nfs_post_op_update_inode(inode, fattr);
237 wdata->res.count = wdata->args.count;
238 wdata->verf.committed = NFS_FILE_SYNC;
240 dprintk("NFS reply write: %d\n", status);
241 return status < 0? status : wdata->res.count;
245 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
246 int flags, struct nameidata *nd)
248 struct nfs_fh fhandle;
249 struct nfs_fattr fattr;
250 struct nfs_createargs arg = {
252 .name = dentry->d_name.name,
253 .len = dentry->d_name.len,
256 struct nfs_diropok res = {
260 struct rpc_message msg = {
261 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
267 nfs_fattr_init(&fattr);
268 dprintk("NFS call create %s\n", dentry->d_name.name);
269 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
271 status = nfs_instantiate(dentry, &fhandle, &fattr);
272 dprintk("NFS reply create: %d\n", status);
277 * In NFSv2, mknod is grafted onto the create call.
280 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
283 struct nfs_fh fhandle;
284 struct nfs_fattr fattr;
285 struct nfs_createargs arg = {
287 .name = dentry->d_name.name,
288 .len = dentry->d_name.len,
291 struct nfs_diropok res = {
295 struct rpc_message msg = {
296 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
302 dprintk("NFS call mknod %s\n", dentry->d_name.name);
304 mode = sattr->ia_mode;
305 if (S_ISFIFO(mode)) {
306 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
307 sattr->ia_valid &= ~ATTR_SIZE;
308 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
309 sattr->ia_valid |= ATTR_SIZE;
310 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
313 nfs_fattr_init(&fattr);
314 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
315 nfs_mark_for_revalidate(dir);
317 if (status == -EINVAL && S_ISFIFO(mode)) {
318 sattr->ia_mode = mode;
319 nfs_fattr_init(&fattr);
320 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
323 status = nfs_instantiate(dentry, &fhandle, &fattr);
324 dprintk("NFS reply mknod: %d\n", status);
329 nfs_proc_remove(struct inode *dir, struct qstr *name)
331 struct nfs_diropargs arg = {
336 struct rpc_message msg = {
337 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
342 dprintk("NFS call remove %s\n", name->name);
343 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
344 nfs_mark_for_revalidate(dir);
346 dprintk("NFS reply remove: %d\n", status);
351 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
353 struct nfs_diropargs *arg;
355 arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
358 arg->fh = NFS_FH(dir->d_inode);
359 arg->name = name->name;
360 arg->len = name->len;
361 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
367 nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
369 struct rpc_message *msg = &task->tk_msg;
372 nfs_mark_for_revalidate(dir->d_inode);
373 kfree(msg->rpc_argp);
379 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
380 struct inode *new_dir, struct qstr *new_name)
382 struct nfs_renameargs arg = {
383 .fromfh = NFS_FH(old_dir),
384 .fromname = old_name->name,
385 .fromlen = old_name->len,
386 .tofh = NFS_FH(new_dir),
387 .toname = new_name->name,
388 .tolen = new_name->len
390 struct rpc_message msg = {
391 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
396 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
397 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
398 nfs_mark_for_revalidate(old_dir);
399 nfs_mark_for_revalidate(new_dir);
400 dprintk("NFS reply rename: %d\n", status);
405 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
407 struct nfs_linkargs arg = {
408 .fromfh = NFS_FH(inode),
410 .toname = name->name,
413 struct rpc_message msg = {
414 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
419 dprintk("NFS call link %s\n", name->name);
420 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
421 nfs_mark_for_revalidate(inode);
422 nfs_mark_for_revalidate(dir);
423 dprintk("NFS reply link: %d\n", status);
428 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
429 unsigned int len, struct iattr *sattr)
431 struct nfs_fh fhandle;
432 struct nfs_fattr fattr;
433 struct nfs_symlinkargs arg = {
434 .fromfh = NFS_FH(dir),
435 .fromname = dentry->d_name.name,
436 .fromlen = dentry->d_name.len,
441 struct rpc_message msg = {
442 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
447 if (len > NFS2_MAXPATHLEN)
448 return -ENAMETOOLONG;
450 dprintk("NFS call symlink %s\n", dentry->d_name.name);
452 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
453 nfs_mark_for_revalidate(dir);
456 * V2 SYMLINK requests don't return any attributes. Setting the
457 * filehandle size to zero indicates to nfs_instantiate that it
458 * should fill in the data with a LOOKUP call on the wire.
461 nfs_fattr_init(&fattr);
463 status = nfs_instantiate(dentry, &fhandle, &fattr);
466 dprintk("NFS reply symlink: %d\n", status);
471 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
473 struct nfs_fh fhandle;
474 struct nfs_fattr fattr;
475 struct nfs_createargs arg = {
477 .name = dentry->d_name.name,
478 .len = dentry->d_name.len,
481 struct nfs_diropok res = {
485 struct rpc_message msg = {
486 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
492 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
493 nfs_fattr_init(&fattr);
494 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
495 nfs_mark_for_revalidate(dir);
497 status = nfs_instantiate(dentry, &fhandle, &fattr);
498 dprintk("NFS reply mkdir: %d\n", status);
503 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
505 struct nfs_diropargs arg = {
510 struct rpc_message msg = {
511 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
516 dprintk("NFS call rmdir %s\n", name->name);
517 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
518 nfs_mark_for_revalidate(dir);
519 dprintk("NFS reply rmdir: %d\n", status);
524 * The READDIR implementation is somewhat hackish - we pass a temporary
525 * buffer to the encode function, which installs it in the receive
526 * the receive iovec. The decode function just parses the reply to make
527 * sure it is syntactically correct; the entries itself are decoded
528 * from nfs_readdir by calling the decode_entry function directly.
531 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
532 u64 cookie, struct page *page, unsigned int count, int plus)
534 struct inode *dir = dentry->d_inode;
535 struct nfs_readdirargs arg = {
541 struct rpc_message msg = {
542 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
550 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
551 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
553 dprintk("NFS reply readdir: %d\n", status);
559 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
560 struct nfs_fsstat *stat)
562 struct nfs2_fsstat fsinfo;
563 struct rpc_message msg = {
564 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
570 dprintk("NFS call statfs\n");
571 nfs_fattr_init(stat->fattr);
572 status = rpc_call_sync(server->client, &msg, 0);
573 dprintk("NFS reply statfs: %d\n", status);
576 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
577 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
578 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
587 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
588 struct nfs_fsinfo *info)
590 struct nfs2_fsstat fsinfo;
591 struct rpc_message msg = {
592 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
598 dprintk("NFS call fsinfo\n");
599 nfs_fattr_init(info->fattr);
600 status = rpc_call_sync(server->client, &msg, 0);
601 dprintk("NFS reply fsinfo: %d\n", status);
604 info->rtmax = NFS_MAXDATA;
605 info->rtpref = fsinfo.tsize;
606 info->rtmult = fsinfo.bsize;
607 info->wtmax = NFS_MAXDATA;
608 info->wtpref = fsinfo.tsize;
609 info->wtmult = fsinfo.bsize;
610 info->dtpref = fsinfo.tsize;
611 info->maxfilesize = 0x7FFFFFFF;
612 info->lease_time = 0;
618 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
619 struct nfs_pathconf *info)
622 info->max_namelen = NFS2_MAXNAMLEN;
626 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
628 if (task->tk_status >= 0) {
629 nfs_refresh_inode(data->inode, data->res.fattr);
630 /* Emulate the eof flag, which isn't normally needed in NFSv2
631 * as it is guaranteed to always return the file attributes
633 if (data->args.offset + data->args.count >= data->res.fattr->size)
639 static void nfs_proc_read_setup(struct nfs_read_data *data)
641 struct rpc_message msg = {
642 .rpc_proc = &nfs_procedures[NFSPROC_READ],
643 .rpc_argp = &data->args,
644 .rpc_resp = &data->res,
645 .rpc_cred = data->cred,
648 rpc_call_setup(&data->task, &msg, 0);
651 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
653 if (task->tk_status >= 0)
654 nfs_post_op_update_inode(data->inode, data->res.fattr);
658 static void nfs_proc_write_setup(struct nfs_write_data *data, int how)
660 struct rpc_message msg = {
661 .rpc_proc = &nfs_procedures[NFSPROC_WRITE],
662 .rpc_argp = &data->args,
663 .rpc_resp = &data->res,
664 .rpc_cred = data->cred,
667 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
668 data->args.stable = NFS_FILE_SYNC;
670 /* Finalize the task. */
671 rpc_call_setup(&data->task, &msg, 0);
675 nfs_proc_commit_setup(struct nfs_write_data *data, int how)
681 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
683 return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl);
687 const struct nfs_rpc_ops nfs_v2_clientops = {
688 .version = 2, /* protocol version */
689 .dentry_ops = &nfs_dentry_operations,
690 .dir_inode_ops = &nfs_dir_inode_operations,
691 .file_inode_ops = &nfs_file_inode_operations,
692 .getroot = nfs_proc_get_root,
693 .getattr = nfs_proc_getattr,
694 .setattr = nfs_proc_setattr,
695 .lookup = nfs_proc_lookup,
696 .access = NULL, /* access */
697 .readlink = nfs_proc_readlink,
698 .read = nfs_proc_read,
699 .write = nfs_proc_write,
700 .commit = NULL, /* commit */
701 .create = nfs_proc_create,
702 .remove = nfs_proc_remove,
703 .unlink_setup = nfs_proc_unlink_setup,
704 .unlink_done = nfs_proc_unlink_done,
705 .rename = nfs_proc_rename,
706 .link = nfs_proc_link,
707 .symlink = nfs_proc_symlink,
708 .mkdir = nfs_proc_mkdir,
709 .rmdir = nfs_proc_rmdir,
710 .readdir = nfs_proc_readdir,
711 .mknod = nfs_proc_mknod,
712 .statfs = nfs_proc_statfs,
713 .fsinfo = nfs_proc_fsinfo,
714 .pathconf = nfs_proc_pathconf,
715 .decode_dirent = nfs_decode_dirent,
716 .read_setup = nfs_proc_read_setup,
717 .read_done = nfs_read_done,
718 .write_setup = nfs_proc_write_setup,
719 .write_done = nfs_write_done,
720 .commit_setup = nfs_proc_commit_setup,
721 .file_open = nfs_open,
722 .file_release = nfs_release,
723 .lock = nfs_proc_lock,