File: /usr/src/linux/fs/nfs/proc.c
1 /*
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>
32 #include <linux/slab.h>
33 #include <linux/sched.h>
34 #include <linux/mm.h>
35 #include <linux/utsname.h>
36 #include <linux/errno.h>
37 #include <linux/string.h>
38 #include <linux/in.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
45 #define NFSDBG_FACILITY NFSDBG_PROC
46
47 /*
48 * Bare-bones access to getattr: this is for nfs_read_super.
49 */
50 static int
51 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
52 struct nfs_fattr *fattr)
53 {
54 int status;
55
56 dprintk("NFS call getroot\n");
57 fattr->valid = 0;
58 status = rpc_call(server->client, NFSPROC_GETATTR, fhandle, fattr, 0);
59 dprintk("NFS reply getroot\n");
60 return status;
61 }
62
63 /*
64 * One function for each procedure in the NFS protocol.
65 */
66 static int
67 nfs_proc_getattr(struct inode *inode, struct nfs_fattr *fattr)
68 {
69 int status;
70
71 dprintk("NFS call getattr\n");
72 fattr->valid = 0;
73 status = rpc_call(NFS_CLIENT(inode), NFSPROC_GETATTR,
74 NFS_FH(inode), fattr, 0);
75 dprintk("NFS reply getattr\n");
76 return status;
77 }
78
79 static int
80 nfs_proc_setattr(struct inode *inode, struct nfs_fattr *fattr,
81 struct iattr *sattr)
82 {
83 struct nfs_sattrargs arg = { NFS_FH(inode), sattr };
84 int status;
85
86 dprintk("NFS call setattr\n");
87 fattr->valid = 0;
88 status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0);
89 dprintk("NFS reply setattr\n");
90 return status;
91 }
92
93 static int
94 nfs_proc_lookup(struct inode *dir, struct qstr *name,
95 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
96 {
97 struct nfs_diropargs arg = { NFS_FH(dir), name->name, name->len };
98 struct nfs_diropok res = { fhandle, fattr };
99 int status;
100
101 dprintk("NFS call lookup %s\n", name->name);
102 fattr->valid = 0;
103 status = rpc_call(NFS_CLIENT(dir), NFSPROC_LOOKUP, &arg, &res, 0);
104 dprintk("NFS reply lookup: %d\n", status);
105 return status;
106 }
107
108 static int
109 nfs_proc_readlink(struct inode *inode, void *buffer, unsigned int bufsiz)
110 {
111 struct nfs_readlinkargs args = { NFS_FH(inode), buffer, bufsiz };
112 struct nfs_readlinkres res = { buffer, bufsiz };
113 int status;
114
115 dprintk("NFS call readlink\n");
116 status = rpc_call(NFS_CLIENT(inode), NFSPROC_READLINK,
117 &args, &res, 0);
118 dprintk("NFS reply readlink: %d\n", status);
119 return status;
120 }
121
122 static int
123 nfs_proc_read(struct inode *inode, struct rpc_cred *cred,
124 struct nfs_fattr *fattr, int flags,
125 loff_t offset, unsigned int count, void *buffer, int *eofp)
126 {
127 struct nfs_readargs arg = { NFS_FH(inode), offset, count, 1,
128 {{ buffer, count }, {0,0}, {0,0}, {0,0},
129 {0,0}, {0,0}, {0,0}, {0,0}} };
130 struct nfs_readres res = { fattr, count, 0};
131 struct rpc_message msg = { NFSPROC_READ, &arg, &res, cred };
132 int status;
133
134 dprintk("NFS call read %d @ %Ld\n", count, (long long)offset);
135 fattr->valid = 0;
136 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
137
138 dprintk("NFS reply read: %d\n", status);
139 *eofp = res.eof;
140 return status;
141 }
142
143 static int
144 nfs_proc_write(struct inode *inode, struct rpc_cred *cred,
145 struct nfs_fattr *fattr, int how,
146 loff_t offset, unsigned int count,
147 void *buffer, struct nfs_writeverf *verf)
148 {
149 struct nfs_writeargs arg = {NFS_FH(inode), offset, count,
150 NFS_FILE_SYNC, 1,
151 {{buffer, count}, {0,0}, {0,0}, {0,0},
152 {0,0}, {0,0}, {0,0}, {0,0}}};
153 struct nfs_writeres res = {fattr, verf, count};
154 struct rpc_message msg = { NFSPROC_WRITE, &arg, &res, cred };
155 int status, flags = 0;
156
157 dprintk("NFS call write %d @ %Ld\n", count, (long long)offset);
158 fattr->valid = 0;
159 if (how & NFS_RW_SWAP)
160 flags |= NFS_RPC_SWAPFLAGS;
161 status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
162
163 dprintk("NFS reply write: %d\n", status);
164 verf->committed = NFS_FILE_SYNC; /* NFSv2 always syncs data */
165 return status < 0? status : count;
166 }
167
168 static int
169 nfs_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr,
170 int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
171 {
172 struct nfs_createargs arg = { NFS_FH(dir), name->name,
173 name->len, sattr };
174 struct nfs_diropok res = { fhandle, fattr };
175 int status;
176
177 fattr->valid = 0;
178 dprintk("NFS call create %s\n", name->name);
179 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
180 dprintk("NFS reply create: %d\n", status);
181 return status;
182 }
183
184 /*
185 * In NFSv2, mknod is grafted onto the create call.
186 */
187 static int
188 nfs_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr,
189 dev_t rdev, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
190 {
191 struct nfs_createargs arg = { NFS_FH(dir), name->name,
192 name->len, sattr };
193 struct nfs_diropok res = { fhandle, fattr };
194 int status, mode;
195
196 dprintk("NFS call mknod %s\n", name->name);
197
198 mode = sattr->ia_mode;
199 if (S_ISFIFO(mode)) {
200 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
201 sattr->ia_valid &= ~ATTR_SIZE;
202 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
203 sattr->ia_valid |= ATTR_SIZE;
204 sattr->ia_size = rdev; /* get out your barf bag */
205 }
206
207 fattr->valid = 0;
208 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
209
210 if (status == -EINVAL && S_ISFIFO(mode)) {
211 sattr->ia_mode = mode;
212 fattr->valid = 0;
213 status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
214 }
215 dprintk("NFS reply mknod: %d\n", status);
216 return status;
217 }
218
219 static int
220 nfs_proc_remove(struct inode *dir, struct qstr *name)
221 {
222 struct nfs_diropargs arg = { NFS_FH(dir), name->name, name->len };
223 struct rpc_message msg = { NFSPROC_REMOVE, &arg, NULL, NULL };
224 int status;
225
226 dprintk("NFS call remove %s\n", name->name);
227 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
228
229 dprintk("NFS reply remove: %d\n", status);
230 return status;
231 }
232
233 static int
234 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
235 {
236 struct nfs_diropargs *arg;
237
238 arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
239 if (!arg)
240 return -ENOMEM;
241 arg->fh = NFS_FH(dir->d_inode);
242 arg->name = name->name;
243 arg->len = name->len;
244 msg->rpc_proc = NFSPROC_REMOVE;
245 msg->rpc_argp = arg;
246 return 0;
247 }
248
249 static void
250 nfs_proc_unlink_done(struct dentry *dir, struct rpc_message *msg)
251 {
252 if (msg->rpc_argp) {
253 NFS_CACHEINV(dir->d_inode);
254 kfree(msg->rpc_argp);
255 }
256 }
257
258 static int
259 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
260 struct inode *new_dir, struct qstr *new_name)
261 {
262 struct nfs_renameargs arg = { NFS_FH(old_dir), old_name->name,
263 old_name->len,
264 NFS_FH(new_dir), new_name->name,
265 new_name->len};
266 int status;
267
268 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
269 status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0);
270 dprintk("NFS reply rename: %d\n", status);
271 return status;
272 }
273
274 static int
275 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
276 {
277 struct nfs_linkargs arg = { NFS_FH(inode), NFS_FH(dir),
278 name->name, name->len };
279 int status;
280
281 dprintk("NFS call link %s\n", name->name);
282 status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0);
283 dprintk("NFS reply link: %d\n", status);
284 return status;
285 }
286
287 static int
288 nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
289 struct iattr *sattr, struct nfs_fh *fhandle,
290 struct nfs_fattr *fattr)
291 {
292 struct nfs_symlinkargs arg = { NFS_FH(dir), name->name, name->len,
293 path->name, path->len, sattr };
294 int status;
295
296 dprintk("NFS call symlink %s -> %s\n", name->name, path->name);
297 fattr->valid = 0;
298 status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0);
299 dprintk("NFS reply symlink: %d\n", status);
300 return status;
301 }
302
303 static int
304 nfs_proc_mkdir(struct inode *dir, struct qstr *name, struct iattr *sattr,
305 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
306 {
307 struct nfs_createargs arg = { NFS_FH(dir), name->name, name->len,
308 sattr };
309 struct nfs_diropok res = { fhandle, fattr };
310 int status;
311
312 dprintk("NFS call mkdir %s\n", name->name);
313 fattr->valid = 0;
314 status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0);
315 dprintk("NFS reply mkdir: %d\n", status);
316 return status;
317 }
318
319 static int
320 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
321 {
322 struct nfs_diropargs arg = { NFS_FH(dir), name->name, name->len };
323 int status;
324
325 dprintk("NFS call rmdir %s\n", name->name);
326 status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0);
327 dprintk("NFS reply rmdir: %d\n", status);
328 return status;
329 }
330
331 /*
332 * The READDIR implementation is somewhat hackish - we pass a temporary
333 * buffer to the encode function, which installs it in the receive
334 * the receive iovec. The decode function just parses the reply to make
335 * sure it is syntactically correct; the entries itself are decoded
336 * from nfs_readdir by calling the decode_entry function directly.
337 */
338 static int
339 nfs_proc_readdir(struct inode *dir, struct rpc_cred *cred,
340 __u64 cookie, void *entry,
341 unsigned int size, int plus)
342 {
343 struct nfs_readdirargs arg;
344 struct nfs_readdirres res;
345 struct rpc_message msg = { NFSPROC_READDIR, &arg, &res, cred };
346 int status;
347
348 arg.fh = NFS_FH(dir);
349 arg.cookie = cookie;
350 arg.buffer = entry;
351 arg.bufsiz = size;
352 res.buffer = entry;
353 res.bufsiz = size;
354
355 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
356 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
357
358 dprintk("NFS reply readdir: %d\n", status);
359 return status;
360 }
361
362 static int
363 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
364 struct nfs_fsinfo *info)
365 {
366 int status;
367
368 dprintk("NFS call statfs\n");
369 memset((char *)info, 0, sizeof(*info));
370 status = rpc_call(server->client, NFSPROC_STATFS, fhandle, info, 0);
371 dprintk("NFS reply statfs: %d\n", status);
372 return status;
373 }
374
375 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
376
377 struct nfs_rpc_ops nfs_v2_clientops = {
378 2, /* protocol version */
379 nfs_proc_get_root,
380 nfs_proc_getattr,
381 nfs_proc_setattr,
382 nfs_proc_lookup,
383 NULL, /* access */
384 nfs_proc_readlink,
385 nfs_proc_read,
386 nfs_proc_write,
387 NULL, /* commit */
388 nfs_proc_create,
389 nfs_proc_remove,
390 nfs_proc_unlink_setup,
391 nfs_proc_unlink_done,
392 nfs_proc_rename,
393 nfs_proc_link,
394 nfs_proc_symlink,
395 nfs_proc_mkdir,
396 nfs_proc_rmdir,
397 nfs_proc_readdir,
398 nfs_proc_mknod,
399 nfs_proc_statfs,
400 nfs_decode_dirent,
401 };
402