4 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
6 * OS-independent nfs remote procedure call functions
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/errno.h>
36 #include <linux/string.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>
47 #define NFSDBG_FACILITY NFSDBG_PROC
50 * Bare-bones access to getattr: this is for nfs_read_super.
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],
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);
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);
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;
97 * One function for each procedure in the NFS protocol.
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],
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);
118 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
121 struct inode *inode = dentry->d_inode;
122 struct nfs_sattrargs arg = {
126 struct rpc_message msg = {
127 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
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);
142 nfs_setattr_update_inode(inode, sattr);
143 dprintk("NFS reply setattr: %d\n", status);
148 nfs_proc_lookup(struct inode *dir, struct qstr *name,
149 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
151 struct nfs_diropargs arg = {
156 struct nfs_diropok res = {
160 struct rpc_message msg = {
161 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
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);
174 static int nfs_proc_readlink(struct inode *inode, struct page *page,
175 unsigned int pgbase, unsigned int pglen)
177 struct nfs_readlinkargs args = {
183 struct rpc_message msg = {
184 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
189 dprintk("NFS call readlink\n");
190 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
191 dprintk("NFS reply readlink: %d\n", status);
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 = {
203 .name = dentry->d_name.name,
204 .len = dentry->d_name.len,
207 struct nfs_diropok res = {
211 struct rpc_message msg = {
212 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
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);
223 status = nfs_instantiate(dentry, &fhandle, &fattr);
224 dprintk("NFS reply create: %d\n", status);
229 * In NFSv2, mknod is grafted onto the create call.
232 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
235 struct nfs_fh fhandle;
236 struct nfs_fattr fattr;
237 struct nfs_createargs arg = {
239 .name = dentry->d_name.name,
240 .len = dentry->d_name.len,
243 struct nfs_diropok res = {
247 struct rpc_message msg = {
248 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
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);
275 status = nfs_instantiate(dentry, &fhandle, &fattr);
276 dprintk("NFS reply mknod: %d\n", status);
281 nfs_proc_remove(struct inode *dir, struct qstr *name)
283 struct nfs_removeargs arg = {
285 .name.len = name->len,
286 .name.name = name->name,
288 struct rpc_message msg = {
289 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
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);
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);
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],
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);
341 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
343 struct nfs_linkargs arg = {
344 .fromfh = NFS_FH(inode),
346 .toname = name->name,
349 struct rpc_message msg = {
350 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
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);
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,
377 struct rpc_message msg = {
378 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
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.
397 nfs_fattr_init(&fattr);
399 status = nfs_instantiate(dentry, &fhandle, &fattr);
402 dprintk("NFS reply symlink: %d\n", status);
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 = {
413 .name = dentry->d_name.name,
414 .len = dentry->d_name.len,
417 struct nfs_diropok res = {
421 struct rpc_message msg = {
422 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
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);
433 status = nfs_instantiate(dentry, &fhandle, &fattr);
434 dprintk("NFS reply mkdir: %d\n", status);
439 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
441 struct nfs_diropargs arg = {
446 struct rpc_message msg = {
447 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
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);
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.
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 = {
477 struct rpc_message msg = {
478 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
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);
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],
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);
511 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
512 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
513 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
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],
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);
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;
553 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
554 struct nfs_pathconf *info)
557 info->max_namelen = NFS2_MAXNAMLEN;
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)
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);
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];
595 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
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)
614 start = (__s32)fl->fl_start;
615 if ((loff_t)start != fl->fl_start)
618 if (fl->fl_end != OFFSET_MAX) {
619 end = (__s32)fl->fl_end;
620 if ((loff_t)end != fl->fl_end)
623 end = NFS_LOCK32_OFFSET_MAX;
625 if (start < 0 || start > end)
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,