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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f7b422b1 DH |
2 | /* |
3 | * linux/fs/nfs/nfs4namespace.c | |
4 | * | |
5 | * Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com> | |
54ceac45 | 6 | * - Modified by David Howells <dhowells@redhat.com> |
f7b422b1 DH |
7 | * |
8 | * NFSv4 namespace | |
9 | */ | |
10 | ||
f2aedb71 | 11 | #include <linux/module.h> |
f7b422b1 DH |
12 | #include <linux/dcache.h> |
13 | #include <linux/mount.h> | |
14 | #include <linux/namei.h> | |
15 | #include <linux/nfs_fs.h> | |
47040da3 | 16 | #include <linux/nfs_mount.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
f7b422b1 DH |
18 | #include <linux/string.h> |
19 | #include <linux/sunrpc/clnt.h> | |
5976687a | 20 | #include <linux/sunrpc/addr.h> |
f7b422b1 DH |
21 | #include <linux/vfs.h> |
22 | #include <linux/inet.h> | |
23 | #include "internal.h" | |
c228fd3a | 24 | #include "nfs4_fs.h" |
f2aedb71 | 25 | #include "nfs.h" |
7d7ea882 | 26 | #include "dns_resolve.h" |
f7b422b1 DH |
27 | |
28 | #define NFSDBG_FACILITY NFSDBG_VFS | |
29 | ||
f2aedb71 DH |
30 | /* |
31 | * Work out the length that an NFSv4 path would render to as a standard posix | |
32 | * path, with a leading slash but no terminating slash. | |
33 | */ | |
34 | static ssize_t nfs4_pathname_len(const struct nfs4_pathname *pathname) | |
35 | { | |
36 | ssize_t len = 0; | |
37 | int i; | |
38 | ||
39 | for (i = 0; i < pathname->ncomponents; i++) { | |
40 | const struct nfs4_string *component = &pathname->components[i]; | |
41 | ||
42 | if (component->len > NAME_MAX) | |
43 | goto too_long; | |
44 | len += 1 + component->len; /* Adding "/foo" */ | |
45 | if (len > PATH_MAX) | |
46 | goto too_long; | |
47 | } | |
48 | return len; | |
49 | ||
50 | too_long: | |
51 | return -ENAMETOOLONG; | |
52 | } | |
53 | ||
f7b422b1 | 54 | /* |
ef95d31e | 55 | * Convert the NFSv4 pathname components into a standard posix path. |
f7b422b1 | 56 | */ |
f2aedb71 DH |
57 | static char *nfs4_pathname_string(const struct nfs4_pathname *pathname, |
58 | unsigned short *_len) | |
f7b422b1 | 59 | { |
f2aedb71 DH |
60 | ssize_t len; |
61 | char *buf, *p; | |
62 | int i; | |
63 | ||
64 | len = nfs4_pathname_len(pathname); | |
65 | if (len < 0) | |
66 | return ERR_PTR(len); | |
67 | *_len = len; | |
68 | ||
69 | p = buf = kmalloc(len + 1, GFP_KERNEL); | |
70 | if (!buf) | |
71 | return ERR_PTR(-ENOMEM); | |
f7b422b1 | 72 | |
f2aedb71 DH |
73 | for (i = 0; i < pathname->ncomponents; i++) { |
74 | const struct nfs4_string *component = &pathname->components[i]; | |
75 | ||
76 | *p++ = '/'; | |
77 | memcpy(p, component->data, component->len); | |
78 | p += component->len; | |
f7b422b1 | 79 | } |
f2aedb71 DH |
80 | |
81 | *p = 0; | |
82 | return buf; | |
f7b422b1 DH |
83 | } |
84 | ||
1aba1567 WAA |
85 | /* |
86 | * return the path component of "<server>:<path>" | |
87 | * nfspath - the "<server>:<path>" string | |
88 | * end - one past the last char that could contain "<server>:" | |
89 | * returns NULL on failure | |
90 | */ | |
91 | static char *nfs_path_component(const char *nfspath, const char *end) | |
92 | { | |
93 | char *p; | |
94 | ||
95 | if (*nfspath == '[') { | |
96 | /* parse [] escaped IPv6 addrs */ | |
97 | p = strchr(nfspath, ']'); | |
98 | if (p != NULL && ++p < end && *p == ':') | |
99 | return p + 1; | |
100 | } else { | |
101 | /* otherwise split on first colon */ | |
102 | p = strchr(nfspath, ':'); | |
103 | if (p != NULL && p < end) | |
104 | return p + 1; | |
105 | } | |
106 | return NULL; | |
107 | } | |
108 | ||
54ceac45 DH |
109 | /* |
110 | * Determine the mount path as a string | |
111 | */ | |
b514f872 | 112 | static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen) |
54ceac45 | 113 | { |
b514f872 | 114 | char *limit; |
97a54868 BH |
115 | char *path = nfs_path(&limit, dentry, buffer, buflen, |
116 | NFS_PATH_CANONICAL); | |
b514f872 | 117 | if (!IS_ERR(path)) { |
1aba1567 WAA |
118 | char *path_component = nfs_path_component(path, limit); |
119 | if (path_component) | |
120 | return path_component; | |
b514f872 AV |
121 | } |
122 | return path; | |
54ceac45 DH |
123 | } |
124 | ||
125 | /* | |
126 | * Check that fs_locations::fs_root [RFC3530 6.3] is a prefix for what we | |
127 | * believe to be the server path to this dentry | |
128 | */ | |
b514f872 | 129 | static int nfs4_validate_fspath(struct dentry *dentry, |
54ceac45 | 130 | const struct nfs4_fs_locations *locations, |
f2aedb71 | 131 | struct nfs_fs_context *ctx) |
54ceac45 | 132 | { |
62a55d08 SM |
133 | const char *path; |
134 | char *fs_path; | |
f2aedb71 | 135 | unsigned short len; |
62a55d08 | 136 | char *buf; |
f2aedb71 | 137 | int n; |
54ceac45 | 138 | |
f2aedb71 | 139 | buf = kmalloc(4096, GFP_KERNEL); |
e0b27d98 CIK |
140 | if (!buf) |
141 | return -ENOMEM; | |
142 | ||
f2aedb71 DH |
143 | path = nfs4_path(dentry, buf, 4096); |
144 | if (IS_ERR(path)) { | |
145 | kfree(buf); | |
54ceac45 | 146 | return PTR_ERR(path); |
f2aedb71 | 147 | } |
54ceac45 | 148 | |
f2aedb71 DH |
149 | fs_path = nfs4_pathname_string(&locations->fs_path, &len); |
150 | if (IS_ERR(fs_path)) { | |
151 | kfree(buf); | |
54ceac45 | 152 | return PTR_ERR(fs_path); |
f2aedb71 | 153 | } |
54ceac45 | 154 | |
f2aedb71 DH |
155 | n = strncmp(path, fs_path, len); |
156 | kfree(buf); | |
157 | kfree(fs_path); | |
158 | if (n != 0) { | |
54ceac45 | 159 | dprintk("%s: path %s does not begin with fsroot %s\n", |
f2aedb71 | 160 | __func__, path, ctx->nfs_server.export_path); |
54ceac45 DH |
161 | return -ENOENT; |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
7d7ea882 | 167 | static size_t nfs_parse_server_name(char *string, size_t len, |
292f503c | 168 | struct sockaddr *sa, size_t salen, struct net *net) |
7d7ea882 TM |
169 | { |
170 | ssize_t ret; | |
171 | ||
33faaa38 | 172 | ret = rpc_pton(net, string, len, sa, salen); |
7d7ea882 | 173 | if (ret == 0) { |
33faaa38 | 174 | ret = nfs_dns_resolve_name(net, string, len, sa, salen); |
7d7ea882 TM |
175 | if (ret < 0) |
176 | ret = 0; | |
177 | } | |
178 | return ret; | |
179 | } | |
180 | ||
9568c5e9 CL |
181 | /** |
182 | * nfs_find_best_sec - Find a security mechanism supported locally | |
302fad7b | 183 | * @clnt: pointer to rpc_clnt |
4d4b69dd | 184 | * @server: NFS server struct |
9568c5e9 CL |
185 | * @flavors: List of security tuples returned by SECINFO procedure |
186 | * | |
66b06860 AA |
187 | * Return an rpc client that uses the first security mechanism in |
188 | * "flavors" that is locally supported. The "flavors" array | |
9568c5e9 | 189 | * is searched in the order returned from the server, per RFC 3530 |
66b06860 AA |
190 | * recommendation and each flavor is checked for membership in the |
191 | * sec= mount option list if it exists. | |
8445cd35 AA |
192 | * |
193 | * Return -EPERM if no matching flavor is found in the array. | |
66b06860 AA |
194 | * |
195 | * Please call rpc_shutdown_client() when you are done with this rpc client. | |
196 | * | |
9568c5e9 | 197 | */ |
66b06860 AA |
198 | static struct rpc_clnt *nfs_find_best_sec(struct rpc_clnt *clnt, |
199 | struct nfs_server *server, | |
4d4b69dd | 200 | struct nfs4_secinfo_flavors *flavors) |
2671bfc3 | 201 | { |
66b06860 | 202 | rpc_authflavor_t pflavor; |
9568c5e9 | 203 | struct nfs4_secinfo4 *secinfo; |
fb15b26f | 204 | unsigned int i; |
2671bfc3 BS |
205 | |
206 | for (i = 0; i < flavors->num_flavors; i++) { | |
9568c5e9 CL |
207 | secinfo = &flavors->flavors[i]; |
208 | ||
209 | switch (secinfo->flavor) { | |
210 | case RPC_AUTH_NULL: | |
211 | case RPC_AUTH_UNIX: | |
212 | case RPC_AUTH_GSS: | |
66b06860 | 213 | pflavor = rpcauth_get_pseudoflavor(secinfo->flavor, |
9568c5e9 | 214 | &secinfo->flavor_info); |
66b06860 AA |
215 | /* does the pseudoflavor match a sec= mount opt? */ |
216 | if (pflavor != RPC_AUTH_MAXFLAVOR && | |
217 | nfs_auth_info_match(&server->auth_info, pflavor)) { | |
218 | struct rpc_clnt *new; | |
219 | struct rpc_cred *cred; | |
220 | ||
221 | /* Cloning creates an rpc_auth for the flavor */ | |
222 | new = rpc_clone_client_set_auth(clnt, pflavor); | |
223 | if (IS_ERR(new)) | |
224 | continue; | |
225 | /** | |
226 | * Check that the user actually can use the | |
227 | * flavor. This is mostly for RPC_AUTH_GSS | |
228 | * where cr_init obtains a gss context | |
229 | */ | |
230 | cred = rpcauth_lookupcred(new->cl_auth, 0); | |
231 | if (IS_ERR(cred)) { | |
232 | rpc_shutdown_client(new); | |
233 | continue; | |
234 | } | |
235 | put_rpccred(cred); | |
236 | return new; | |
237 | } | |
2671bfc3 BS |
238 | } |
239 | } | |
66b06860 | 240 | return ERR_PTR(-EPERM); |
2671bfc3 BS |
241 | } |
242 | ||
66b06860 AA |
243 | /** |
244 | * nfs4_negotiate_security - in response to an NFS4ERR_WRONGSEC on lookup, | |
245 | * return an rpc_clnt that uses the best available security flavor with | |
246 | * respect to the secinfo flavor list and the sec= mount options. | |
247 | * | |
248 | * @clnt: RPC client to clone | |
249 | * @inode: directory inode | |
250 | * @name: lookup name | |
251 | * | |
252 | * Please call rpc_shutdown_client() when you are done with this rpc client. | |
253 | */ | |
254 | struct rpc_clnt * | |
255 | nfs4_negotiate_security(struct rpc_clnt *clnt, struct inode *inode, | |
beffb8fe | 256 | const struct qstr *name) |
72de53ec BS |
257 | { |
258 | struct page *page; | |
259 | struct nfs4_secinfo_flavors *flavors; | |
66b06860 | 260 | struct rpc_clnt *new; |
72de53ec BS |
261 | int err; |
262 | ||
263 | page = alloc_page(GFP_KERNEL); | |
264 | if (!page) | |
66b06860 AA |
265 | return ERR_PTR(-ENOMEM); |
266 | ||
72de53ec BS |
267 | flavors = page_address(page); |
268 | ||
269 | err = nfs4_proc_secinfo(inode, name, flavors); | |
270 | if (err < 0) { | |
66b06860 | 271 | new = ERR_PTR(err); |
72de53ec BS |
272 | goto out; |
273 | } | |
274 | ||
66b06860 | 275 | new = nfs_find_best_sec(clnt, NFS_SERVER(inode), flavors); |
72de53ec BS |
276 | |
277 | out: | |
278 | put_page(page); | |
66b06860 | 279 | return new; |
72de53ec BS |
280 | } |
281 | ||
f2aedb71 DH |
282 | static int try_location(struct fs_context *fc, |
283 | const struct nfs4_fs_location *location) | |
4ada29d5 | 284 | { |
f2aedb71 DH |
285 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
286 | unsigned int len, s; | |
287 | char *export_path, *source, *p; | |
288 | int ret = -ENOENT; | |
289 | ||
290 | /* Allocate a buffer big enough to hold any of the hostnames plus a | |
291 | * terminating char and also a buffer big enough to hold the hostname | |
292 | * plus a colon plus the path. | |
293 | */ | |
294 | len = 0; | |
460cdbc8 | 295 | for (s = 0; s < location->nservers; s++) { |
ea31a443 | 296 | const struct nfs4_string *buf = &location->servers[s]; |
f2aedb71 DH |
297 | if (buf->len > len) |
298 | len = buf->len; | |
299 | } | |
4ada29d5 | 300 | |
f2aedb71 DH |
301 | kfree(ctx->nfs_server.hostname); |
302 | ctx->nfs_server.hostname = kmalloc(len + 1, GFP_KERNEL); | |
303 | if (!ctx->nfs_server.hostname) | |
304 | return -ENOMEM; | |
305 | ||
306 | export_path = nfs4_pathname_string(&location->rootpath, | |
307 | &ctx->nfs_server.export_path_len); | |
308 | if (IS_ERR(export_path)) | |
309 | return PTR_ERR(export_path); | |
310 | ||
4659ed7c | 311 | kfree(ctx->nfs_server.export_path); |
f2aedb71 DH |
312 | ctx->nfs_server.export_path = export_path; |
313 | ||
314 | source = kmalloc(len + 1 + ctx->nfs_server.export_path_len + 1, | |
315 | GFP_KERNEL); | |
316 | if (!source) | |
317 | return -ENOMEM; | |
318 | ||
319 | kfree(fc->source); | |
320 | fc->source = source; | |
f2aedb71 DH |
321 | for (s = 0; s < location->nservers; s++) { |
322 | const struct nfs4_string *buf = &location->servers[s]; | |
4ada29d5 | 323 | |
ea31a443 BF |
324 | if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len)) |
325 | continue; | |
517be09d | 326 | |
62a55d08 | 327 | ctx->nfs_server.addrlen = |
f2aedb71 | 328 | nfs_parse_server_name(buf->data, buf->len, |
62a55d08 SM |
329 | &ctx->nfs_server.address, |
330 | sizeof(ctx->nfs_server._address), | |
f2aedb71 | 331 | fc->net_ns); |
62a55d08 | 332 | if (ctx->nfs_server.addrlen == 0) |
ea31a443 | 333 | continue; |
517be09d | 334 | |
62a55d08 | 335 | rpc_set_port(&ctx->nfs_server.address, NFS_PORT); |
f2aedb71 DH |
336 | |
337 | memcpy(ctx->nfs_server.hostname, buf->data, buf->len); | |
338 | ctx->nfs_server.hostname[buf->len] = '\0'; | |
4ada29d5 | 339 | |
f2aedb71 DH |
340 | p = source; |
341 | memcpy(p, buf->data, buf->len); | |
342 | p += buf->len; | |
343 | *p++ = ':'; | |
344 | memcpy(p, ctx->nfs_server.export_path, ctx->nfs_server.export_path_len); | |
345 | p += ctx->nfs_server.export_path_len; | |
346 | *p = 0; | |
4ada29d5 | 347 | |
f2aedb71 DH |
348 | ret = nfs4_get_referral_tree(fc); |
349 | if (ret == 0) | |
350 | return 0; | |
4ada29d5 | 351 | } |
f2aedb71 DH |
352 | |
353 | return ret; | |
4ada29d5 BF |
354 | } |
355 | ||
f7b422b1 DH |
356 | /** |
357 | * nfs_follow_referral - set up mountpoint when hitting a referral on moved error | |
3cab1854 | 358 | * @fc: pointer to struct nfs_fs_context |
302fad7b | 359 | * @locations: array of NFSv4 server location information |
f7b422b1 DH |
360 | * |
361 | */ | |
f2aedb71 DH |
362 | static int nfs_follow_referral(struct fs_context *fc, |
363 | const struct nfs4_fs_locations *locations) | |
f7b422b1 | 364 | { |
f2aedb71 | 365 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
3f43c666 | 366 | int loc, error; |
f7b422b1 DH |
367 | |
368 | if (locations == NULL || locations->nlocations <= 0) | |
f2aedb71 | 369 | return -ENOENT; |
54ceac45 | 370 | |
f2aedb71 | 371 | dprintk("%s: referral at %pd2\n", __func__, ctx->clone_data.dentry); |
f7b422b1 | 372 | |
54ceac45 | 373 | /* Ensure fs path is a prefix of current dentry path */ |
f2aedb71 DH |
374 | error = nfs4_validate_fspath(ctx->clone_data.dentry, locations, ctx); |
375 | if (error < 0) | |
376 | return error; | |
f7b422b1 | 377 | |
f2aedb71 | 378 | error = -ENOENT; |
460cdbc8 | 379 | for (loc = 0; loc < locations->nlocations; loc++) { |
509de811 | 380 | const struct nfs4_fs_location *location = &locations->locations[loc]; |
f7b422b1 DH |
381 | |
382 | if (location == NULL || location->nservers <= 0 || | |
460cdbc8 | 383 | location->rootpath.ncomponents == 0) |
f7b422b1 | 384 | continue; |
f7b422b1 | 385 | |
f2aedb71 DH |
386 | error = try_location(fc, location); |
387 | if (error == 0) | |
388 | return 0; | |
f7b422b1 DH |
389 | } |
390 | ||
f2aedb71 | 391 | return error; |
f7b422b1 DH |
392 | } |
393 | ||
394 | /* | |
395 | * nfs_do_refmount - handle crossing a referral on server | |
396 | * @dentry - dentry of referral | |
f7b422b1 DH |
397 | * |
398 | */ | |
f2aedb71 | 399 | static int nfs_do_refmount(struct fs_context *fc, struct rpc_clnt *client) |
f7b422b1 | 400 | { |
f2aedb71 DH |
401 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
402 | struct dentry *dentry, *parent; | |
f7b422b1 DH |
403 | struct nfs4_fs_locations *fs_locations = NULL; |
404 | struct page *page; | |
f2aedb71 | 405 | int err = -ENOMEM; |
f7b422b1 DH |
406 | |
407 | /* BUG_ON(IS_ROOT(dentry)); */ | |
f7b422b1 | 408 | page = alloc_page(GFP_KERNEL); |
f2aedb71 DH |
409 | if (!page) |
410 | return -ENOMEM; | |
f7b422b1 DH |
411 | |
412 | fs_locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); | |
f2aedb71 | 413 | if (!fs_locations) |
f7b422b1 DH |
414 | goto out_free; |
415 | ||
416 | /* Get locations */ | |
f2aedb71 | 417 | dentry = ctx->clone_data.dentry; |
f7b422b1 | 418 | parent = dget_parent(dentry); |
6de1472f AV |
419 | dprintk("%s: getting locations for %pd2\n", |
420 | __func__, dentry); | |
54ceac45 | 421 | |
2b0143b5 | 422 | err = nfs4_proc_fs_locations(client, d_inode(parent), &dentry->d_name, fs_locations, page); |
f7b422b1 | 423 | dput(parent); |
f2aedb71 DH |
424 | if (err != 0) |
425 | goto out_free_2; | |
426 | ||
427 | err = -ENOENT; | |
428 | if (fs_locations->nlocations <= 0 || | |
f7b422b1 | 429 | fs_locations->fs_path.ncomponents <= 0) |
f2aedb71 | 430 | goto out_free_2; |
f7b422b1 | 431 | |
f2aedb71 DH |
432 | err = nfs_follow_referral(fc, fs_locations); |
433 | out_free_2: | |
434 | kfree(fs_locations); | |
f7b422b1 DH |
435 | out_free: |
436 | __free_page(page); | |
f2aedb71 | 437 | return err; |
f7b422b1 | 438 | } |
281cad46 | 439 | |
f2aedb71 | 440 | int nfs4_submount(struct fs_context *fc, struct nfs_server *server) |
281cad46 | 441 | { |
f2aedb71 DH |
442 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
443 | struct dentry *dentry = ctx->clone_data.dentry; | |
281cad46 | 444 | struct dentry *parent = dget_parent(dentry); |
2b0143b5 | 445 | struct inode *dir = d_inode(parent); |
281cad46 | 446 | struct rpc_clnt *client; |
f2aedb71 | 447 | int ret; |
281cad46 BS |
448 | |
449 | /* Look it up again to get its attributes and sec flavor */ | |
f7b37b8b | 450 | client = nfs4_proc_lookup_mountpoint(dir, dentry, ctx->mntfh, |
f2aedb71 | 451 | ctx->clone_data.fattr); |
281cad46 BS |
452 | dput(parent); |
453 | if (IS_ERR(client)) | |
f2aedb71 | 454 | return PTR_ERR(client); |
281cad46 | 455 | |
f2aedb71 DH |
456 | ctx->selected_flavor = client->cl_auth->au_flavor; |
457 | if (ctx->clone_data.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { | |
458 | ret = nfs_do_refmount(fc, client); | |
459 | } else { | |
460 | ret = nfs_do_submount(fc); | |
47040da3 | 461 | } |
281cad46 BS |
462 | |
463 | rpc_shutdown_client(client); | |
f2aedb71 | 464 | return ret; |
281cad46 | 465 | } |
800c06a5 CL |
466 | |
467 | /* | |
468 | * Try one location from the fs_locations array. | |
469 | * | |
470 | * Returns zero on success, or a negative errno value. | |
471 | */ | |
472 | static int nfs4_try_replacing_one_location(struct nfs_server *server, | |
473 | char *page, char *page2, | |
474 | const struct nfs4_fs_location *location) | |
475 | { | |
476 | const size_t addr_bufsize = sizeof(struct sockaddr_storage); | |
292f503c | 477 | struct net *net = rpc_net_ns(server->client); |
800c06a5 CL |
478 | struct sockaddr *sap; |
479 | unsigned int s; | |
480 | size_t salen; | |
481 | int error; | |
482 | ||
483 | sap = kmalloc(addr_bufsize, GFP_KERNEL); | |
484 | if (sap == NULL) | |
485 | return -ENOMEM; | |
486 | ||
487 | error = -ENOENT; | |
488 | for (s = 0; s < location->nservers; s++) { | |
489 | const struct nfs4_string *buf = &location->servers[s]; | |
490 | char *hostname; | |
491 | ||
492 | if (buf->len <= 0 || buf->len > PAGE_SIZE) | |
493 | continue; | |
494 | ||
495 | if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len) != NULL) | |
496 | continue; | |
497 | ||
498 | salen = nfs_parse_server_name(buf->data, buf->len, | |
292f503c | 499 | sap, addr_bufsize, net); |
800c06a5 CL |
500 | if (salen == 0) |
501 | continue; | |
502 | rpc_set_port(sap, NFS_PORT); | |
503 | ||
504 | error = -ENOMEM; | |
a8bd9ddf | 505 | hostname = kmemdup_nul(buf->data, buf->len, GFP_KERNEL); |
800c06a5 CL |
506 | if (hostname == NULL) |
507 | break; | |
508 | ||
292f503c | 509 | error = nfs4_update_server(server, hostname, sap, salen, net); |
800c06a5 CL |
510 | kfree(hostname); |
511 | if (error == 0) | |
512 | break; | |
513 | } | |
514 | ||
515 | kfree(sap); | |
516 | return error; | |
517 | } | |
518 | ||
519 | /** | |
520 | * nfs4_replace_transport - set up transport to destination server | |
521 | * | |
522 | * @server: export being migrated | |
523 | * @locations: fs_locations array | |
524 | * | |
525 | * Returns zero on success, or a negative errno value. | |
526 | * | |
527 | * The client tries all the entries in the "locations" array, in the | |
528 | * order returned by the server, until one works or the end of the | |
529 | * array is reached. | |
530 | */ | |
531 | int nfs4_replace_transport(struct nfs_server *server, | |
532 | const struct nfs4_fs_locations *locations) | |
533 | { | |
534 | char *page = NULL, *page2 = NULL; | |
535 | int loc, error; | |
536 | ||
537 | error = -ENOENT; | |
538 | if (locations == NULL || locations->nlocations <= 0) | |
539 | goto out; | |
540 | ||
541 | error = -ENOMEM; | |
542 | page = (char *) __get_free_page(GFP_USER); | |
543 | if (!page) | |
544 | goto out; | |
545 | page2 = (char *) __get_free_page(GFP_USER); | |
546 | if (!page2) | |
547 | goto out; | |
548 | ||
549 | for (loc = 0; loc < locations->nlocations; loc++) { | |
550 | const struct nfs4_fs_location *location = | |
551 | &locations->locations[loc]; | |
552 | ||
553 | if (location == NULL || location->nservers <= 0 || | |
554 | location->rootpath.ncomponents == 0) | |
555 | continue; | |
556 | ||
557 | error = nfs4_try_replacing_one_location(server, page, | |
558 | page2, location); | |
559 | if (error == 0) | |
560 | break; | |
561 | } | |
562 | ||
563 | out: | |
564 | free_page((unsigned long)page); | |
565 | free_page((unsigned long)page2); | |
566 | return error; | |
567 | } |