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>
48 #define NFSDBG_FACILITY NFSDBG_PROC
51 * Bare-bones access to getattr: this is for nfs_read_super.
54 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
55 struct nfs_fsinfo *info)
57 struct nfs_fattr *fattr = info->fattr;
58 struct nfs2_fsstat fsinfo;
59 struct rpc_message msg = {
60 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
66 dprintk("%s: call getattr\n", __func__);
67 nfs_fattr_init(fattr);
68 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
69 dprintk("%s: reply getattr: %d\n", __func__, status);
72 dprintk("%s: call statfs\n", __func__);
73 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
74 msg.rpc_resp = &fsinfo;
75 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
76 dprintk("%s: reply statfs: %d\n", __func__, status);
79 info->rtmax = NFS_MAXDATA;
80 info->rtpref = fsinfo.tsize;
81 info->rtmult = fsinfo.bsize;
82 info->wtmax = NFS_MAXDATA;
83 info->wtpref = fsinfo.tsize;
84 info->wtmult = fsinfo.bsize;
85 info->dtpref = fsinfo.tsize;
86 info->maxfilesize = 0x7FFFFFFF;
92 * One function for each procedure in the NFS protocol.
95 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
96 struct nfs_fattr *fattr)
98 struct rpc_message msg = {
99 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
105 dprintk("NFS call getattr\n");
106 nfs_fattr_init(fattr);
107 status = rpc_call_sync(server->client, &msg, 0);
108 dprintk("NFS reply getattr: %d\n", status);
113 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
116 struct inode *inode = dentry->d_inode;
117 struct nfs_sattrargs arg = {
121 struct rpc_message msg = {
122 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
128 /* Mask out the non-modebit related stuff from attr->ia_mode */
129 sattr->ia_mode &= S_IALLUGO;
131 dprintk("NFS call setattr\n");
132 if (sattr->ia_valid & ATTR_FILE)
133 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
134 nfs_fattr_init(fattr);
135 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
137 nfs_setattr_update_inode(inode, sattr);
138 dprintk("NFS reply setattr: %d\n", status);
143 nfs_proc_lookup(struct inode *dir, struct qstr *name,
144 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
146 struct nfs_diropargs arg = {
151 struct nfs_diropok res = {
155 struct rpc_message msg = {
156 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
162 dprintk("NFS call lookup %s\n", name->name);
163 nfs_fattr_init(fattr);
164 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
165 dprintk("NFS reply lookup: %d\n", status);
169 static int nfs_proc_readlink(struct inode *inode, struct page *page,
170 unsigned int pgbase, unsigned int pglen)
172 struct nfs_readlinkargs args = {
178 struct rpc_message msg = {
179 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
184 dprintk("NFS call readlink\n");
185 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
186 dprintk("NFS reply readlink: %d\n", status);
191 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
192 int flags, struct nameidata *nd)
194 struct nfs_fh fhandle;
195 struct nfs_fattr fattr;
196 struct nfs_createargs arg = {
198 .name = dentry->d_name.name,
199 .len = dentry->d_name.len,
202 struct nfs_diropok res = {
206 struct rpc_message msg = {
207 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
213 nfs_fattr_init(&fattr);
214 dprintk("NFS call create %s\n", dentry->d_name.name);
215 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
216 nfs_mark_for_revalidate(dir);
218 status = nfs_instantiate(dentry, &fhandle, &fattr);
219 dprintk("NFS reply create: %d\n", status);
224 * In NFSv2, mknod is grafted onto the create call.
227 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
230 struct nfs_fh fhandle;
231 struct nfs_fattr fattr;
232 struct nfs_createargs arg = {
234 .name = dentry->d_name.name,
235 .len = dentry->d_name.len,
238 struct nfs_diropok res = {
242 struct rpc_message msg = {
243 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
249 dprintk("NFS call mknod %s\n", dentry->d_name.name);
251 mode = sattr->ia_mode;
252 if (S_ISFIFO(mode)) {
253 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
254 sattr->ia_valid &= ~ATTR_SIZE;
255 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
256 sattr->ia_valid |= ATTR_SIZE;
257 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
260 nfs_fattr_init(&fattr);
261 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
262 nfs_mark_for_revalidate(dir);
264 if (status == -EINVAL && S_ISFIFO(mode)) {
265 sattr->ia_mode = mode;
266 nfs_fattr_init(&fattr);
267 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
270 status = nfs_instantiate(dentry, &fhandle, &fattr);
271 dprintk("NFS reply mknod: %d\n", status);
276 nfs_proc_remove(struct inode *dir, struct qstr *name)
278 struct nfs_removeargs arg = {
280 .name.len = name->len,
281 .name.name = name->name,
283 struct rpc_message msg = {
284 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
289 dprintk("NFS call remove %s\n", name->name);
290 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
291 nfs_mark_for_revalidate(dir);
293 dprintk("NFS reply remove: %d\n", status);
298 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
300 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
303 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
305 nfs_mark_for_revalidate(dir);
310 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
311 struct inode *new_dir, struct qstr *new_name)
313 struct nfs_renameargs arg = {
314 .fromfh = NFS_FH(old_dir),
315 .fromname = old_name->name,
316 .fromlen = old_name->len,
317 .tofh = NFS_FH(new_dir),
318 .toname = new_name->name,
319 .tolen = new_name->len
321 struct rpc_message msg = {
322 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
327 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
328 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
329 nfs_mark_for_revalidate(old_dir);
330 nfs_mark_for_revalidate(new_dir);
331 dprintk("NFS reply rename: %d\n", status);
336 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
338 struct nfs_linkargs arg = {
339 .fromfh = NFS_FH(inode),
341 .toname = name->name,
344 struct rpc_message msg = {
345 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
350 dprintk("NFS call link %s\n", name->name);
351 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
352 nfs_mark_for_revalidate(inode);
353 nfs_mark_for_revalidate(dir);
354 dprintk("NFS reply link: %d\n", status);
359 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
360 unsigned int len, struct iattr *sattr)
362 struct nfs_fh fhandle;
363 struct nfs_fattr fattr;
364 struct nfs_symlinkargs arg = {
365 .fromfh = NFS_FH(dir),
366 .fromname = dentry->d_name.name,
367 .fromlen = dentry->d_name.len,
372 struct rpc_message msg = {
373 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
378 if (len > NFS2_MAXPATHLEN)
379 return -ENAMETOOLONG;
381 dprintk("NFS call symlink %s\n", dentry->d_name.name);
383 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
384 nfs_mark_for_revalidate(dir);
387 * V2 SYMLINK requests don't return any attributes. Setting the
388 * filehandle size to zero indicates to nfs_instantiate that it
389 * should fill in the data with a LOOKUP call on the wire.
392 nfs_fattr_init(&fattr);
394 status = nfs_instantiate(dentry, &fhandle, &fattr);
397 dprintk("NFS reply symlink: %d\n", status);
402 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
404 struct nfs_fh fhandle;
405 struct nfs_fattr fattr;
406 struct nfs_createargs arg = {
408 .name = dentry->d_name.name,
409 .len = dentry->d_name.len,
412 struct nfs_diropok res = {
416 struct rpc_message msg = {
417 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
423 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
424 nfs_fattr_init(&fattr);
425 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
426 nfs_mark_for_revalidate(dir);
428 status = nfs_instantiate(dentry, &fhandle, &fattr);
429 dprintk("NFS reply mkdir: %d\n", status);
434 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
436 struct nfs_diropargs arg = {
441 struct rpc_message msg = {
442 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
447 dprintk("NFS call rmdir %s\n", name->name);
448 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
449 nfs_mark_for_revalidate(dir);
450 dprintk("NFS reply rmdir: %d\n", status);
455 * The READDIR implementation is somewhat hackish - we pass a temporary
456 * buffer to the encode function, which installs it in the receive
457 * the receive iovec. The decode function just parses the reply to make
458 * sure it is syntactically correct; the entries itself are decoded
459 * from nfs_readdir by calling the decode_entry function directly.
462 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
463 u64 cookie, struct page *page, unsigned int count, int plus)
465 struct inode *dir = dentry->d_inode;
466 struct nfs_readdirargs arg = {
472 struct rpc_message msg = {
473 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
479 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
480 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
482 nfs_invalidate_atime(dir);
484 dprintk("NFS reply readdir: %d\n", status);
489 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
490 struct nfs_fsstat *stat)
492 struct nfs2_fsstat fsinfo;
493 struct rpc_message msg = {
494 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
500 dprintk("NFS call statfs\n");
501 nfs_fattr_init(stat->fattr);
502 status = rpc_call_sync(server->client, &msg, 0);
503 dprintk("NFS reply statfs: %d\n", status);
506 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
507 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
508 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
517 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
518 struct nfs_fsinfo *info)
520 struct nfs2_fsstat fsinfo;
521 struct rpc_message msg = {
522 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
528 dprintk("NFS call fsinfo\n");
529 nfs_fattr_init(info->fattr);
530 status = rpc_call_sync(server->client, &msg, 0);
531 dprintk("NFS reply fsinfo: %d\n", status);
534 info->rtmax = NFS_MAXDATA;
535 info->rtpref = fsinfo.tsize;
536 info->rtmult = fsinfo.bsize;
537 info->wtmax = NFS_MAXDATA;
538 info->wtpref = fsinfo.tsize;
539 info->wtmult = fsinfo.bsize;
540 info->dtpref = fsinfo.tsize;
541 info->maxfilesize = 0x7FFFFFFF;
542 info->lease_time = 0;
548 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
549 struct nfs_pathconf *info)
552 info->max_namelen = NFS2_MAXNAMLEN;
556 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
558 nfs_invalidate_atime(data->inode);
559 if (task->tk_status >= 0) {
560 nfs_refresh_inode(data->inode, data->res.fattr);
561 /* Emulate the eof flag, which isn't normally needed in NFSv2
562 * as it is guaranteed to always return the file attributes
564 if (data->args.offset + data->args.count >= data->res.fattr->size)
570 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
572 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
575 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
577 if (task->tk_status >= 0)
578 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
582 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
584 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
585 data->args.stable = NFS_FILE_SYNC;
586 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
590 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
596 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
598 struct inode *inode = filp->f_path.dentry->d_inode;
600 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
603 /* Helper functions for NFS lock bounds checking */
604 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
605 static int nfs_lock_check_bounds(const struct file_lock *fl)
609 start = (__s32)fl->fl_start;
610 if ((loff_t)start != fl->fl_start)
613 if (fl->fl_end != OFFSET_MAX) {
614 end = (__s32)fl->fl_end;
615 if ((loff_t)end != fl->fl_end)
618 end = NFS_LOCK32_OFFSET_MAX;
620 if (start < 0 || start > end)
627 const struct nfs_rpc_ops nfs_v2_clientops = {
628 .version = 2, /* protocol version */
629 .dentry_ops = &nfs_dentry_operations,
630 .dir_inode_ops = &nfs_dir_inode_operations,
631 .file_inode_ops = &nfs_file_inode_operations,
632 .getroot = nfs_proc_get_root,
633 .getattr = nfs_proc_getattr,
634 .setattr = nfs_proc_setattr,
635 .lookup = nfs_proc_lookup,
636 .access = NULL, /* access */
637 .readlink = nfs_proc_readlink,
638 .create = nfs_proc_create,
639 .remove = nfs_proc_remove,
640 .unlink_setup = nfs_proc_unlink_setup,
641 .unlink_done = nfs_proc_unlink_done,
642 .rename = nfs_proc_rename,
643 .link = nfs_proc_link,
644 .symlink = nfs_proc_symlink,
645 .mkdir = nfs_proc_mkdir,
646 .rmdir = nfs_proc_rmdir,
647 .readdir = nfs_proc_readdir,
648 .mknod = nfs_proc_mknod,
649 .statfs = nfs_proc_statfs,
650 .fsinfo = nfs_proc_fsinfo,
651 .pathconf = nfs_proc_pathconf,
652 .decode_dirent = nfs_decode_dirent,
653 .read_setup = nfs_proc_read_setup,
654 .read_done = nfs_read_done,
655 .write_setup = nfs_proc_write_setup,
656 .write_done = nfs_write_done,
657 .commit_setup = nfs_proc_commit_setup,
658 .lock = nfs_proc_lock,
659 .lock_check_bounds = nfs_lock_check_bounds,