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/time.h>
34 #include <linux/errno.h>
35 #include <linux/string.h>
37 #include <linux/pagemap.h>
38 #include <linux/sunrpc/clnt.h>
39 #include <linux/nfs.h>
40 #include <linux/nfs2.h>
41 #include <linux/nfs_fs.h>
42 #include <linux/nfs_page.h>
43 #include <linux/lockd/bind.h>
44 #include <linux/freezer.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);
195 struct nfs_createdata {
196 struct nfs_createargs arg;
197 struct nfs_diropok res;
198 struct nfs_fh fhandle;
199 struct nfs_fattr fattr;
202 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
203 struct dentry *dentry, struct iattr *sattr)
205 struct nfs_createdata *data;
207 data = kmalloc(sizeof(*data), GFP_KERNEL);
210 data->arg.fh = NFS_FH(dir);
211 data->arg.name = dentry->d_name.name;
212 data->arg.len = dentry->d_name.len;
213 data->arg.sattr = sattr;
214 nfs_fattr_init(&data->fattr);
215 data->fhandle.size = 0;
216 data->res.fh = &data->fhandle;
217 data->res.fattr = &data->fattr;
222 static void nfs_free_createdata(const struct nfs_createdata *data)
228 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
231 struct nfs_createdata *data;
232 struct rpc_message msg = {
233 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
235 int status = -ENOMEM;
237 dprintk("NFS call create %s\n", dentry->d_name.name);
238 data = nfs_alloc_createdata(dir, dentry, sattr);
241 msg.rpc_argp = &data->arg;
242 msg.rpc_resp = &data->res;
243 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
244 nfs_mark_for_revalidate(dir);
246 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
247 nfs_free_createdata(data);
249 dprintk("NFS reply create: %d\n", status);
254 * In NFSv2, mknod is grafted onto the create call.
257 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
260 struct nfs_createdata *data;
261 struct rpc_message msg = {
262 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
265 int status = -ENOMEM;
267 dprintk("NFS call mknod %s\n", dentry->d_name.name);
269 mode = sattr->ia_mode;
270 if (S_ISFIFO(mode)) {
271 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
272 sattr->ia_valid &= ~ATTR_SIZE;
273 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
274 sattr->ia_valid |= ATTR_SIZE;
275 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
278 data = nfs_alloc_createdata(dir, dentry, sattr);
281 msg.rpc_argp = &data->arg;
282 msg.rpc_resp = &data->res;
284 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
285 nfs_mark_for_revalidate(dir);
287 if (status == -EINVAL && S_ISFIFO(mode)) {
288 sattr->ia_mode = mode;
289 nfs_fattr_init(data->res.fattr);
290 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
293 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
294 nfs_free_createdata(data);
296 dprintk("NFS reply mknod: %d\n", status);
301 nfs_proc_remove(struct inode *dir, struct qstr *name)
303 struct nfs_removeargs arg = {
307 struct rpc_message msg = {
308 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
313 dprintk("NFS call remove %s\n", name->name);
314 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
315 nfs_mark_for_revalidate(dir);
317 dprintk("NFS reply remove: %d\n", status);
322 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
324 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
327 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
329 rpc_call_start(task);
332 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
334 nfs_mark_for_revalidate(dir);
339 nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
341 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
344 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
346 rpc_call_start(task);
350 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
351 struct inode *new_dir)
353 nfs_mark_for_revalidate(old_dir);
354 nfs_mark_for_revalidate(new_dir);
359 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
360 struct inode *new_dir, struct qstr *new_name)
362 struct nfs_renameargs arg = {
363 .old_dir = NFS_FH(old_dir),
364 .old_name = old_name,
365 .new_dir = NFS_FH(new_dir),
366 .new_name = new_name,
368 struct rpc_message msg = {
369 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
374 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
375 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
376 nfs_mark_for_revalidate(old_dir);
377 nfs_mark_for_revalidate(new_dir);
378 dprintk("NFS reply rename: %d\n", status);
383 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
385 struct nfs_linkargs arg = {
386 .fromfh = NFS_FH(inode),
388 .toname = name->name,
391 struct rpc_message msg = {
392 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
397 dprintk("NFS call link %s\n", name->name);
398 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
399 nfs_mark_for_revalidate(inode);
400 nfs_mark_for_revalidate(dir);
401 dprintk("NFS reply link: %d\n", status);
406 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
407 unsigned int len, struct iattr *sattr)
410 struct nfs_fattr *fattr;
411 struct nfs_symlinkargs arg = {
412 .fromfh = NFS_FH(dir),
413 .fromname = dentry->d_name.name,
414 .fromlen = dentry->d_name.len,
419 struct rpc_message msg = {
420 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
423 int status = -ENAMETOOLONG;
425 dprintk("NFS call symlink %s\n", dentry->d_name.name);
427 if (len > NFS2_MAXPATHLEN)
430 fh = nfs_alloc_fhandle();
431 fattr = nfs_alloc_fattr();
433 if (fh == NULL || fattr == NULL)
436 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
437 nfs_mark_for_revalidate(dir);
440 * V2 SYMLINK requests don't return any attributes. Setting the
441 * filehandle size to zero indicates to nfs_instantiate that it
442 * should fill in the data with a LOOKUP call on the wire.
445 status = nfs_instantiate(dentry, fh, fattr);
448 nfs_free_fattr(fattr);
449 nfs_free_fhandle(fh);
451 dprintk("NFS reply symlink: %d\n", status);
456 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
458 struct nfs_createdata *data;
459 struct rpc_message msg = {
460 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
462 int status = -ENOMEM;
464 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
465 data = nfs_alloc_createdata(dir, dentry, sattr);
468 msg.rpc_argp = &data->arg;
469 msg.rpc_resp = &data->res;
471 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
472 nfs_mark_for_revalidate(dir);
474 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
475 nfs_free_createdata(data);
477 dprintk("NFS reply mkdir: %d\n", status);
482 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
484 struct nfs_diropargs arg = {
489 struct rpc_message msg = {
490 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
495 dprintk("NFS call rmdir %s\n", name->name);
496 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
497 nfs_mark_for_revalidate(dir);
498 dprintk("NFS reply rmdir: %d\n", status);
503 * The READDIR implementation is somewhat hackish - we pass a temporary
504 * buffer to the encode function, which installs it in the receive
505 * the receive iovec. The decode function just parses the reply to make
506 * sure it is syntactically correct; the entries itself are decoded
507 * from nfs_readdir by calling the decode_entry function directly.
510 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
511 u64 cookie, struct page **pages, unsigned int count, int plus)
513 struct inode *dir = dentry->d_inode;
514 struct nfs_readdirargs arg = {
520 struct rpc_message msg = {
521 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
527 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
528 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
530 nfs_invalidate_atime(dir);
532 dprintk("NFS reply readdir: %d\n", status);
537 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
538 struct nfs_fsstat *stat)
540 struct nfs2_fsstat fsinfo;
541 struct rpc_message msg = {
542 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
548 dprintk("NFS call statfs\n");
549 nfs_fattr_init(stat->fattr);
550 status = rpc_call_sync(server->client, &msg, 0);
551 dprintk("NFS reply statfs: %d\n", status);
554 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
555 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
556 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
565 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
566 struct nfs_fsinfo *info)
568 struct nfs2_fsstat fsinfo;
569 struct rpc_message msg = {
570 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
576 dprintk("NFS call fsinfo\n");
577 nfs_fattr_init(info->fattr);
578 status = rpc_call_sync(server->client, &msg, 0);
579 dprintk("NFS reply fsinfo: %d\n", status);
582 info->rtmax = NFS_MAXDATA;
583 info->rtpref = fsinfo.tsize;
584 info->rtmult = fsinfo.bsize;
585 info->wtmax = NFS_MAXDATA;
586 info->wtpref = fsinfo.tsize;
587 info->wtmult = fsinfo.bsize;
588 info->dtpref = fsinfo.tsize;
589 info->maxfilesize = 0x7FFFFFFF;
590 info->lease_time = 0;
596 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
597 struct nfs_pathconf *info)
600 info->max_namelen = NFS2_MAXNAMLEN;
604 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
606 struct inode *inode = data->header->inode;
608 nfs_invalidate_atime(inode);
609 if (task->tk_status >= 0) {
610 nfs_refresh_inode(inode, data->res.fattr);
611 /* Emulate the eof flag, which isn't normally needed in NFSv2
612 * as it is guaranteed to always return the file attributes
614 if (data->args.offset + data->res.count >= data->res.fattr->size)
620 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
622 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
625 static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
627 rpc_call_start(task);
630 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
632 struct inode *inode = data->header->inode;
634 if (task->tk_status >= 0)
635 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
639 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
641 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
642 data->args.stable = NFS_FILE_SYNC;
643 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
646 static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
648 rpc_call_start(task);
651 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
657 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
663 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
665 struct inode *inode = filp->f_path.dentry->d_inode;
667 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
670 /* Helper functions for NFS lock bounds checking */
671 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
672 static int nfs_lock_check_bounds(const struct file_lock *fl)
676 start = (__s32)fl->fl_start;
677 if ((loff_t)start != fl->fl_start)
680 if (fl->fl_end != OFFSET_MAX) {
681 end = (__s32)fl->fl_end;
682 if ((loff_t)end != fl->fl_end)
685 end = NFS_LOCK32_OFFSET_MAX;
687 if (start < 0 || start > end)
694 static int nfs_have_delegation(struct inode *inode, fmode_t flags)
699 static int nfs_return_delegation(struct inode *inode)
705 static const struct inode_operations nfs_dir_inode_operations = {
706 .create = nfs_create,
707 .lookup = nfs_lookup,
709 .unlink = nfs_unlink,
710 .symlink = nfs_symlink,
714 .rename = nfs_rename,
715 .permission = nfs_permission,
716 .getattr = nfs_getattr,
717 .setattr = nfs_setattr,
720 static const struct inode_operations nfs_file_inode_operations = {
721 .permission = nfs_permission,
722 .getattr = nfs_getattr,
723 .setattr = nfs_setattr,
726 const struct nfs_rpc_ops nfs_v2_clientops = {
727 .version = 2, /* protocol version */
728 .dentry_ops = &nfs_dentry_operations,
729 .dir_inode_ops = &nfs_dir_inode_operations,
730 .file_inode_ops = &nfs_file_inode_operations,
731 .file_ops = &nfs_file_operations,
732 .getroot = nfs_proc_get_root,
733 .submount = nfs_submount,
734 .try_mount = nfs_try_mount,
735 .getattr = nfs_proc_getattr,
736 .setattr = nfs_proc_setattr,
737 .lookup = nfs_proc_lookup,
738 .access = NULL, /* access */
739 .readlink = nfs_proc_readlink,
740 .create = nfs_proc_create,
741 .remove = nfs_proc_remove,
742 .unlink_setup = nfs_proc_unlink_setup,
743 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
744 .unlink_done = nfs_proc_unlink_done,
745 .rename = nfs_proc_rename,
746 .rename_setup = nfs_proc_rename_setup,
747 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
748 .rename_done = nfs_proc_rename_done,
749 .link = nfs_proc_link,
750 .symlink = nfs_proc_symlink,
751 .mkdir = nfs_proc_mkdir,
752 .rmdir = nfs_proc_rmdir,
753 .readdir = nfs_proc_readdir,
754 .mknod = nfs_proc_mknod,
755 .statfs = nfs_proc_statfs,
756 .fsinfo = nfs_proc_fsinfo,
757 .pathconf = nfs_proc_pathconf,
758 .decode_dirent = nfs2_decode_dirent,
759 .read_setup = nfs_proc_read_setup,
760 .read_pageio_init = nfs_pageio_init_read,
761 .read_rpc_prepare = nfs_proc_read_rpc_prepare,
762 .read_done = nfs_read_done,
763 .write_setup = nfs_proc_write_setup,
764 .write_pageio_init = nfs_pageio_init_write,
765 .write_rpc_prepare = nfs_proc_write_rpc_prepare,
766 .write_done = nfs_write_done,
767 .commit_setup = nfs_proc_commit_setup,
768 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
769 .lock = nfs_proc_lock,
770 .lock_check_bounds = nfs_lock_check_bounds,
771 .close_context = nfs_close_context,
772 .have_delegation = nfs_have_delegation,
773 .return_delegation = nfs_return_delegation,
774 .alloc_client = nfs_alloc_client,
775 .init_client = nfs_init_client,
776 .free_client = nfs_free_client,
777 .create_server = nfs_create_server,
778 .clone_server = nfs_clone_server,