blob: 77d5e21c4ad6f9ace63881cc7f1593ff405238a1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/proc.c
3 *
4 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
5 *
6 * OS-independent nfs remote procedure call functions
7 *
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.
11 *
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.
15 *
16 * Also, the code currently doesn't check the size of the packet, when
17 * it decodes the packet.
18 *
19 * Feel free to fix it and mail me the diffs if it worries you.
20 *
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
24 *
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).
28 */
29
30#include <linux/types.h>
31#include <linux/param.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/time.h>
33#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/errno.h>
35#include <linux/string.h>
36#include <linux/in.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>
David Howellsf7b422b2006-06-09 09:34:33 -040044#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#define NFSDBG_FACILITY NFSDBG_PROC
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/*
Jeff Layton97cefcc2010-01-08 12:17:21 -050049 * wrapper to handle the -EKEYEXPIRED error message. This should generally
50 * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
51 * support the NFSERR_JUKEBOX error code, but we handle this situation in the
52 * same way that we handle that error with NFSv3.
53 */
54static int
55nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
56{
57 int res;
58 do {
59 res = rpc_call_sync(clnt, msg, flags);
60 if (res != -EKEYEXPIRED)
61 break;
62 schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
63 res = -ERESTARTSYS;
64 } while (!fatal_signal_pending(current));
65 return res;
66}
67
68#define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
69
70static int
71nfs_async_handle_expired_key(struct rpc_task *task)
72{
73 if (task->tk_status != -EKEYEXPIRED)
74 return 0;
75 task->tk_status = 0;
76 rpc_restart_call(task);
77 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
78 return 1;
79}
80
81/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 * Bare-bones access to getattr: this is for nfs_read_super.
83 */
84static int
85nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
86 struct nfs_fsinfo *info)
87{
88 struct nfs_fattr *fattr = info->fattr;
89 struct nfs2_fsstat fsinfo;
Chuck Leverdead28d2006-03-20 13:44:23 -050090 struct rpc_message msg = {
91 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
92 .rpc_argp = fhandle,
93 .rpc_resp = fattr,
94 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 int status;
96
Harvey Harrison3110ff82008-05-02 13:42:44 -070097 dprintk("%s: call getattr\n", __func__);
Trond Myklebust0e574af2005-10-27 22:12:38 -040098 nfs_fattr_init(fattr);
EG Keizer37ca8f52008-08-19 16:34:36 -040099 status = rpc_call_sync(server->client, &msg, 0);
100 /* Retry with default authentication if different */
101 if (status && server->nfs_client->cl_rpcclient != server->client)
102 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700103 dprintk("%s: reply getattr: %d\n", __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 if (status)
105 return status;
Harvey Harrison3110ff82008-05-02 13:42:44 -0700106 dprintk("%s: call statfs\n", __func__);
Chuck Leverdead28d2006-03-20 13:44:23 -0500107 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
108 msg.rpc_resp = &fsinfo;
EG Keizer37ca8f52008-08-19 16:34:36 -0400109 status = rpc_call_sync(server->client, &msg, 0);
110 /* Retry with default authentication if different */
111 if (status && server->nfs_client->cl_rpcclient != server->client)
112 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700113 dprintk("%s: reply statfs: %d\n", __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (status)
115 return status;
116 info->rtmax = NFS_MAXDATA;
117 info->rtpref = fsinfo.tsize;
118 info->rtmult = fsinfo.bsize;
119 info->wtmax = NFS_MAXDATA;
120 info->wtpref = fsinfo.tsize;
121 info->wtmult = fsinfo.bsize;
122 info->dtpref = fsinfo.tsize;
123 info->maxfilesize = 0x7FFFFFFF;
124 info->lease_time = 0;
125 return 0;
126}
127
128/*
129 * One function for each procedure in the NFS protocol.
130 */
131static int
132nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
133 struct nfs_fattr *fattr)
134{
Chuck Leverdead28d2006-03-20 13:44:23 -0500135 struct rpc_message msg = {
136 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
137 .rpc_argp = fhandle,
138 .rpc_resp = fattr,
139 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 int status;
141
142 dprintk("NFS call getattr\n");
Trond Myklebust0e574af2005-10-27 22:12:38 -0400143 nfs_fattr_init(fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500144 status = rpc_call_sync(server->client, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 dprintk("NFS reply getattr: %d\n", status);
146 return status;
147}
148
149static int
150nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
151 struct iattr *sattr)
152{
153 struct inode *inode = dentry->d_inode;
154 struct nfs_sattrargs arg = {
155 .fh = NFS_FH(inode),
156 .sattr = sattr
157 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500158 struct rpc_message msg = {
159 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
160 .rpc_argp = &arg,
161 .rpc_resp = fattr,
162 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 int status;
164
Trond Myklebustcf3fff52006-01-03 09:55:53 +0100165 /* Mask out the non-modebit related stuff from attr->ia_mode */
166 sattr->ia_mode &= S_IALLUGO;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 dprintk("NFS call setattr\n");
Trond Myklebust659bfcd2008-06-10 19:39:41 -0400169 if (sattr->ia_valid & ATTR_FILE)
170 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
Trond Myklebust0e574af2005-10-27 22:12:38 -0400171 nfs_fattr_init(fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500172 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
Trond Myklebust65e43082005-08-16 11:49:44 -0400173 if (status == 0)
174 nfs_setattr_update_inode(inode, sattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 dprintk("NFS reply setattr: %d\n", status);
176 return status;
177}
178
179static int
180nfs_proc_lookup(struct inode *dir, struct qstr *name,
181 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
182{
183 struct nfs_diropargs arg = {
184 .fh = NFS_FH(dir),
185 .name = name->name,
186 .len = name->len
187 };
188 struct nfs_diropok res = {
189 .fh = fhandle,
190 .fattr = fattr
191 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500192 struct rpc_message msg = {
193 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
194 .rpc_argp = &arg,
195 .rpc_resp = &res,
196 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 int status;
198
199 dprintk("NFS call lookup %s\n", name->name);
Trond Myklebust0e574af2005-10-27 22:12:38 -0400200 nfs_fattr_init(fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500201 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 dprintk("NFS reply lookup: %d\n", status);
203 return status;
204}
205
206static int nfs_proc_readlink(struct inode *inode, struct page *page,
207 unsigned int pgbase, unsigned int pglen)
208{
209 struct nfs_readlinkargs args = {
210 .fh = NFS_FH(inode),
211 .pgbase = pgbase,
212 .pglen = pglen,
213 .pages = &page
214 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500215 struct rpc_message msg = {
216 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
217 .rpc_argp = &args,
218 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 int status;
220
221 dprintk("NFS call readlink\n");
Chuck Leverdead28d2006-03-20 13:44:23 -0500222 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 dprintk("NFS reply readlink: %d\n", status);
224 return status;
225}
226
Trond Myklebusteb872f02010-04-16 16:22:51 -0400227struct nfs_createdata {
228 struct nfs_createargs arg;
229 struct nfs_diropok res;
230 struct nfs_fh fhandle;
231 struct nfs_fattr fattr;
232};
233
234static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
235 struct dentry *dentry, struct iattr *sattr)
236{
237 struct nfs_createdata *data;
238
239 data = kmalloc(sizeof(*data), GFP_KERNEL);
240
241 if (data != NULL) {
242 data->arg.fh = NFS_FH(dir);
243 data->arg.name = dentry->d_name.name;
244 data->arg.len = dentry->d_name.len;
245 data->arg.sattr = sattr;
246 nfs_fattr_init(&data->fattr);
247 data->fhandle.size = 0;
248 data->res.fh = &data->fhandle;
249 data->res.fattr = &data->fattr;
250 }
251 return data;
252};
253
254static void nfs_free_createdata(const struct nfs_createdata *data)
255{
256 kfree(data);
257}
258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259static int
260nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
Trond Myklebustc0204fd2010-09-17 10:56:51 -0400261 int flags, struct nfs_open_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Trond Myklebusteb872f02010-04-16 16:22:51 -0400263 struct nfs_createdata *data;
Chuck Leverdead28d2006-03-20 13:44:23 -0500264 struct rpc_message msg = {
265 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
Chuck Leverdead28d2006-03-20 13:44:23 -0500266 };
Trond Myklebusteb872f02010-04-16 16:22:51 -0400267 int status = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 dprintk("NFS call create %s\n", dentry->d_name.name);
Trond Myklebusteb872f02010-04-16 16:22:51 -0400270 data = nfs_alloc_createdata(dir, dentry, sattr);
271 if (data == NULL)
272 goto out;
273 msg.rpc_argp = &data->arg;
274 msg.rpc_resp = &data->res;
Chuck Leverdead28d2006-03-20 13:44:23 -0500275 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustbad2a522007-10-20 13:07:21 -0400276 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (status == 0)
Trond Myklebusteb872f02010-04-16 16:22:51 -0400278 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
279 nfs_free_createdata(data);
280out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 dprintk("NFS reply create: %d\n", status);
282 return status;
283}
284
285/*
286 * In NFSv2, mknod is grafted onto the create call.
287 */
288static int
289nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
290 dev_t rdev)
291{
Trond Myklebusteb872f02010-04-16 16:22:51 -0400292 struct nfs_createdata *data;
Chuck Leverdead28d2006-03-20 13:44:23 -0500293 struct rpc_message msg = {
294 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
Chuck Leverdead28d2006-03-20 13:44:23 -0500295 };
Trond Myklebusteb872f02010-04-16 16:22:51 -0400296 umode_t mode;
297 int status = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 dprintk("NFS call mknod %s\n", dentry->d_name.name);
300
301 mode = sattr->ia_mode;
302 if (S_ISFIFO(mode)) {
303 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
304 sattr->ia_valid &= ~ATTR_SIZE;
305 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
306 sattr->ia_valid |= ATTR_SIZE;
307 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
308 }
309
Trond Myklebusteb872f02010-04-16 16:22:51 -0400310 data = nfs_alloc_createdata(dir, dentry, sattr);
311 if (data == NULL)
312 goto out;
313 msg.rpc_argp = &data->arg;
314 msg.rpc_resp = &data->res;
315
Chuck Leverdead28d2006-03-20 13:44:23 -0500316 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400317 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 if (status == -EINVAL && S_ISFIFO(mode)) {
320 sattr->ia_mode = mode;
Trond Myklebusteb872f02010-04-16 16:22:51 -0400321 nfs_fattr_init(data->res.fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500322 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 }
324 if (status == 0)
Trond Myklebusteb872f02010-04-16 16:22:51 -0400325 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
326 nfs_free_createdata(data);
327out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 dprintk("NFS reply mknod: %d\n", status);
329 return status;
330}
331
332static int
333nfs_proc_remove(struct inode *dir, struct qstr *name)
334{
Trond Myklebust4fdc17b2007-07-14 15:39:57 -0400335 struct nfs_removeargs arg = {
336 .fh = NFS_FH(dir),
337 .name.len = name->len,
338 .name.name = name->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 };
Trond Myklebust4fdc17b2007-07-14 15:39:57 -0400340 struct rpc_message msg = {
341 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
342 .rpc_argp = &arg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 };
344 int status;
345
346 dprintk("NFS call remove %s\n", name->name);
347 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400348 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 dprintk("NFS reply remove: %d\n", status);
351 return status;
352}
353
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400354static void
355nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400360static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Jeff Layton97cefcc2010-01-08 12:17:21 -0500362 if (nfs_async_handle_expired_key(task))
363 return 0;
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400364 nfs_mark_for_revalidate(dir);
365 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366}
367
Jeff Laytond3d41522010-09-17 17:31:57 -0400368static void
369nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
370{
371 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
372}
373
374static int
375nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
376 struct inode *new_dir)
377{
378 if (nfs_async_handle_expired_key(task))
379 return 0;
380 nfs_mark_for_revalidate(old_dir);
381 nfs_mark_for_revalidate(new_dir);
382 return 1;
383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static int
386nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
387 struct inode *new_dir, struct qstr *new_name)
388{
389 struct nfs_renameargs arg = {
Jeff Layton920769f2010-09-17 17:30:25 -0400390 .old_dir = NFS_FH(old_dir),
391 .old_name = old_name,
392 .new_dir = NFS_FH(new_dir),
393 .new_name = new_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500395 struct rpc_message msg = {
396 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
397 .rpc_argp = &arg,
398 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 int status;
400
401 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
Chuck Leverdead28d2006-03-20 13:44:23 -0500402 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400403 nfs_mark_for_revalidate(old_dir);
404 nfs_mark_for_revalidate(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 dprintk("NFS reply rename: %d\n", status);
406 return status;
407}
408
409static int
410nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
411{
412 struct nfs_linkargs arg = {
413 .fromfh = NFS_FH(inode),
414 .tofh = NFS_FH(dir),
415 .toname = name->name,
416 .tolen = name->len
417 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500418 struct rpc_message msg = {
419 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
420 .rpc_argp = &arg,
421 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 int status;
423
424 dprintk("NFS call link %s\n", name->name);
Chuck Leverdead28d2006-03-20 13:44:23 -0500425 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
Trond Myklebust5ba7cc42005-12-03 15:20:17 -0500426 nfs_mark_for_revalidate(inode);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400427 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 dprintk("NFS reply link: %d\n", status);
429 return status;
430}
431
432static int
Chuck Lever94a6d752006-08-22 20:06:23 -0400433nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
434 unsigned int len, struct iattr *sattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
Trond Myklebust23a30612010-04-16 16:22:51 -0400436 struct nfs_fh *fh;
437 struct nfs_fattr *fattr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 struct nfs_symlinkargs arg = {
439 .fromfh = NFS_FH(dir),
Chuck Lever4f390c12006-08-22 20:06:22 -0400440 .fromname = dentry->d_name.name,
441 .fromlen = dentry->d_name.len,
Chuck Lever94a6d752006-08-22 20:06:23 -0400442 .pages = &page,
443 .pathlen = len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 .sattr = sattr
445 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500446 struct rpc_message msg = {
447 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
448 .rpc_argp = &arg,
449 };
Trond Myklebust23a30612010-04-16 16:22:51 -0400450 int status = -ENAMETOOLONG;
Chuck Lever4f390c12006-08-22 20:06:22 -0400451
Chuck Lever94a6d752006-08-22 20:06:23 -0400452 dprintk("NFS call symlink %s\n", dentry->d_name.name);
453
Trond Myklebust23a30612010-04-16 16:22:51 -0400454 if (len > NFS2_MAXPATHLEN)
455 goto out;
456
457 fh = nfs_alloc_fhandle();
458 fattr = nfs_alloc_fattr();
459 status = -ENOMEM;
460 if (fh == NULL || fattr == NULL)
Jesper Juhl878215f2010-12-24 22:22:37 +0000461 goto out_free;
Trond Myklebust23a30612010-04-16 16:22:51 -0400462
Chuck Leverdead28d2006-03-20 13:44:23 -0500463 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400464 nfs_mark_for_revalidate(dir);
Chuck Lever4f390c12006-08-22 20:06:22 -0400465
466 /*
467 * V2 SYMLINK requests don't return any attributes. Setting the
468 * filehandle size to zero indicates to nfs_instantiate that it
469 * should fill in the data with a LOOKUP call on the wire.
470 */
Trond Myklebust23a30612010-04-16 16:22:51 -0400471 if (status == 0)
472 status = nfs_instantiate(dentry, fh, fattr);
Chuck Lever4f390c12006-08-22 20:06:22 -0400473
Jesper Juhl878215f2010-12-24 22:22:37 +0000474out_free:
Trond Myklebust23a30612010-04-16 16:22:51 -0400475 nfs_free_fattr(fattr);
476 nfs_free_fhandle(fh);
477out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 dprintk("NFS reply symlink: %d\n", status);
479 return status;
480}
481
482static int
483nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
484{
Trond Myklebusteb872f02010-04-16 16:22:51 -0400485 struct nfs_createdata *data;
Chuck Leverdead28d2006-03-20 13:44:23 -0500486 struct rpc_message msg = {
487 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
Chuck Leverdead28d2006-03-20 13:44:23 -0500488 };
Trond Myklebusteb872f02010-04-16 16:22:51 -0400489 int status = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
Trond Myklebusteb872f02010-04-16 16:22:51 -0400492 data = nfs_alloc_createdata(dir, dentry, sattr);
493 if (data == NULL)
494 goto out;
495 msg.rpc_argp = &data->arg;
496 msg.rpc_resp = &data->res;
497
Chuck Leverdead28d2006-03-20 13:44:23 -0500498 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400499 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (status == 0)
Trond Myklebusteb872f02010-04-16 16:22:51 -0400501 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
502 nfs_free_createdata(data);
503out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 dprintk("NFS reply mkdir: %d\n", status);
505 return status;
506}
507
508static int
509nfs_proc_rmdir(struct inode *dir, struct qstr *name)
510{
511 struct nfs_diropargs arg = {
512 .fh = NFS_FH(dir),
513 .name = name->name,
514 .len = name->len
515 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500516 struct rpc_message msg = {
517 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
518 .rpc_argp = &arg,
519 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 int status;
521
522 dprintk("NFS call rmdir %s\n", name->name);
Chuck Leverdead28d2006-03-20 13:44:23 -0500523 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
Trond Myklebustdecf4912005-10-27 22:12:39 -0400524 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 dprintk("NFS reply rmdir: %d\n", status);
526 return status;
527}
528
529/*
530 * The READDIR implementation is somewhat hackish - we pass a temporary
531 * buffer to the encode function, which installs it in the receive
532 * the receive iovec. The decode function just parses the reply to make
533 * sure it is syntactically correct; the entries itself are decoded
534 * from nfs_readdir by calling the decode_entry function directly.
535 */
536static int
537nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400538 u64 cookie, struct page **pages, unsigned int count, int plus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539{
540 struct inode *dir = dentry->d_inode;
541 struct nfs_readdirargs arg = {
542 .fh = NFS_FH(dir),
543 .cookie = cookie,
544 .count = count,
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400545 .pages = pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 };
547 struct rpc_message msg = {
548 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
549 .rpc_argp = &arg,
Chuck Leverdead28d2006-03-20 13:44:23 -0500550 .rpc_cred = cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 };
552 int status;
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
555 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
556
Trond Myklebustc4812992007-09-28 17:11:45 -0400557 nfs_invalidate_atime(dir);
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 dprintk("NFS reply readdir: %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return status;
561}
562
563static int
564nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
565 struct nfs_fsstat *stat)
566{
567 struct nfs2_fsstat fsinfo;
Chuck Leverdead28d2006-03-20 13:44:23 -0500568 struct rpc_message msg = {
569 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
570 .rpc_argp = fhandle,
571 .rpc_resp = &fsinfo,
572 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 int status;
574
575 dprintk("NFS call statfs\n");
Trond Myklebust0e574af2005-10-27 22:12:38 -0400576 nfs_fattr_init(stat->fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500577 status = rpc_call_sync(server->client, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 dprintk("NFS reply statfs: %d\n", status);
579 if (status)
580 goto out;
581 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
582 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
583 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
584 stat->tfiles = 0;
585 stat->ffiles = 0;
586 stat->afiles = 0;
587out:
588 return status;
589}
590
591static int
592nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
593 struct nfs_fsinfo *info)
594{
595 struct nfs2_fsstat fsinfo;
Chuck Leverdead28d2006-03-20 13:44:23 -0500596 struct rpc_message msg = {
597 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
598 .rpc_argp = fhandle,
599 .rpc_resp = &fsinfo,
600 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 int status;
602
603 dprintk("NFS call fsinfo\n");
Trond Myklebust0e574af2005-10-27 22:12:38 -0400604 nfs_fattr_init(info->fattr);
Chuck Leverdead28d2006-03-20 13:44:23 -0500605 status = rpc_call_sync(server->client, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 dprintk("NFS reply fsinfo: %d\n", status);
607 if (status)
608 goto out;
609 info->rtmax = NFS_MAXDATA;
610 info->rtpref = fsinfo.tsize;
611 info->rtmult = fsinfo.bsize;
612 info->wtmax = NFS_MAXDATA;
613 info->wtpref = fsinfo.tsize;
614 info->wtmult = fsinfo.bsize;
615 info->dtpref = fsinfo.tsize;
616 info->maxfilesize = 0x7FFFFFFF;
617 info->lease_time = 0;
618out:
619 return status;
620}
621
622static int
623nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
624 struct nfs_pathconf *info)
625{
626 info->max_link = 0;
627 info->max_namelen = NFS2_MAXNAMLEN;
628 return 0;
629}
630
Trond Myklebustec06c092006-03-20 13:44:27 -0500631static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Jeff Layton97cefcc2010-01-08 12:17:21 -0500633 if (nfs_async_handle_expired_key(task))
634 return -EAGAIN;
635
Trond Myklebust8850df92007-09-28 17:20:07 -0400636 nfs_invalidate_atime(data->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (task->tk_status >= 0) {
638 nfs_refresh_inode(data->inode, data->res.fattr);
639 /* Emulate the eof flag, which isn't normally needed in NFSv2
640 * as it is guaranteed to always return the file attributes
641 */
642 if (data->args.offset + data->args.count >= data->res.fattr->size)
643 data->res.eof = 1;
644 }
Trond Myklebustec06c092006-03-20 13:44:27 -0500645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400648static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400650 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
Trond Myklebust788e7a82006-03-20 13:44:27 -0500653static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654{
Jeff Layton97cefcc2010-01-08 12:17:21 -0500655 if (nfs_async_handle_expired_key(task))
656 return -EAGAIN;
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 if (task->tk_status >= 0)
Trond Myklebust70ca8852007-09-30 15:21:24 -0400659 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
Trond Myklebust788e7a82006-03-20 13:44:27 -0500660 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661}
662
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400663static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
666 data->args.stable = NFS_FILE_SYNC;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400667 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
670static void
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400671nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
673 BUG();
674}
675
676static int
677nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
678{
Chuck Lever1093a602008-01-11 17:09:59 -0500679 struct inode *inode = filp->f_path.dentry->d_inode;
680
681 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Trond Myklebust21162712008-05-20 19:34:39 -0400684/* Helper functions for NFS lock bounds checking */
685#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
686static int nfs_lock_check_bounds(const struct file_lock *fl)
687{
688 __s32 start, end;
689
690 start = (__s32)fl->fl_start;
691 if ((loff_t)start != fl->fl_start)
692 goto out_einval;
693
694 if (fl->fl_end != OFFSET_MAX) {
695 end = (__s32)fl->fl_end;
696 if ((loff_t)end != fl->fl_end)
697 goto out_einval;
698 } else
699 end = NFS_LOCK32_OFFSET_MAX;
700
701 if (start < 0 || start > end)
702 goto out_einval;
703 return 0;
704out_einval:
705 return -EINVAL;
706}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
David Howells509de812006-08-22 20:06:11 -0400708const struct nfs_rpc_ops nfs_v2_clientops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 .version = 2, /* protocol version */
710 .dentry_ops = &nfs_dentry_operations,
711 .dir_inode_ops = &nfs_dir_inode_operations,
J. Bruce Fields92cfc622005-06-22 17:16:22 +0000712 .file_inode_ops = &nfs_file_inode_operations,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 .getroot = nfs_proc_get_root,
714 .getattr = nfs_proc_getattr,
715 .setattr = nfs_proc_setattr,
716 .lookup = nfs_proc_lookup,
717 .access = NULL, /* access */
718 .readlink = nfs_proc_readlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 .create = nfs_proc_create,
720 .remove = nfs_proc_remove,
721 .unlink_setup = nfs_proc_unlink_setup,
722 .unlink_done = nfs_proc_unlink_done,
723 .rename = nfs_proc_rename,
Jeff Laytond3d41522010-09-17 17:31:57 -0400724 .rename_setup = nfs_proc_rename_setup,
725 .rename_done = nfs_proc_rename_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 .link = nfs_proc_link,
727 .symlink = nfs_proc_symlink,
728 .mkdir = nfs_proc_mkdir,
729 .rmdir = nfs_proc_rmdir,
730 .readdir = nfs_proc_readdir,
731 .mknod = nfs_proc_mknod,
732 .statfs = nfs_proc_statfs,
733 .fsinfo = nfs_proc_fsinfo,
734 .pathconf = nfs_proc_pathconf,
Chuck Leverf796f8b2010-12-14 14:55:10 +0000735 .decode_dirent = nfs2_decode_dirent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 .read_setup = nfs_proc_read_setup,
Trond Myklebustec06c092006-03-20 13:44:27 -0500737 .read_done = nfs_read_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 .write_setup = nfs_proc_write_setup,
Trond Myklebust788e7a82006-03-20 13:44:27 -0500739 .write_done = nfs_write_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 .commit_setup = nfs_proc_commit_setup,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 .lock = nfs_proc_lock,
Trond Myklebust21162712008-05-20 19:34:39 -0400742 .lock_check_bounds = nfs_lock_check_bounds,
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400743 .close_context = nfs_close_context,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744};