Commit | Line | Data |
---|---|---|
16b374ca AA |
1 | /* |
2 | * Device operations for the pnfs nfs4 file layout driver. | |
3 | * | |
4 | * Copyright (c) 2002 | |
5 | * The Regents of the University of Michigan | |
6 | * All Rights Reserved | |
7 | * | |
8 | * Dean Hildebrand <dhildebz@umich.edu> | |
9 | * Garth Goodson <Garth.Goodson@netapp.com> | |
10 | * | |
11 | * Permission is granted to use, copy, create derivative works, and | |
12 | * redistribute this software and such derivative works for any purpose, | |
13 | * so long as the name of the University of Michigan is not used in | |
14 | * any advertising or publicity pertaining to the use or distribution | |
15 | * of this software without specific, written prior authorization. If | |
16 | * the above copyright notice or any other identification of the | |
17 | * University of Michigan is included in any copy of any portion of | |
18 | * this software, then the disclaimer below must also be included. | |
19 | * | |
20 | * This software is provided as is, without representation or warranty | |
21 | * of any kind either express or implied, including without limitation | |
22 | * the implied warranties of merchantability, fitness for a particular | |
23 | * purpose, or noninfringement. The Regents of the University of | |
24 | * Michigan shall not be liable for any damages, including special, | |
25 | * indirect, incidental, or consequential damages, with respect to any | |
26 | * claim arising out of or in connection with the use of the software, | |
27 | * even if it has been or is hereafter advised of the possibility of | |
28 | * such damages. | |
29 | */ | |
30 | ||
31 | #include <linux/nfs_fs.h> | |
32 | #include <linux/vmalloc.h> | |
98fc685a | 33 | #include <linux/module.h> |
16b374ca AA |
34 | |
35 | #include "internal.h" | |
36 | #include "nfs4filelayout.h" | |
37 | ||
38 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
39 | ||
98fc685a AA |
40 | static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO; |
41 | static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS; | |
42 | ||
16b374ca AA |
43 | /* |
44 | * Data server cache | |
45 | * | |
46 | * Data servers can be mapped to different device ids. | |
47 | * nfs4_pnfs_ds reference counting | |
48 | * - set to 1 on allocation | |
49 | * - incremented when a device id maps a data server already in the cache. | |
50 | * - decremented when deviceid is removed from the cache. | |
51 | */ | |
17280175 | 52 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); |
16b374ca AA |
53 | static LIST_HEAD(nfs4_data_server_cache); |
54 | ||
55 | /* Debug routines */ | |
56 | void | |
57 | print_ds(struct nfs4_pnfs_ds *ds) | |
58 | { | |
59 | if (ds == NULL) { | |
60 | printk("%s NULL device\n", __func__); | |
61 | return; | |
62 | } | |
c9895cb6 | 63 | printk(" ds %s\n" |
16b374ca AA |
64 | " ref count %d\n" |
65 | " client %p\n" | |
66 | " cl_exchange_flags %x\n", | |
c9895cb6 | 67 | ds->ds_remotestr, |
16b374ca AA |
68 | atomic_read(&ds->ds_count), ds->ds_clp, |
69 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); | |
70 | } | |
71 | ||
14f9a607 WAA |
72 | static bool |
73 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
16b374ca | 74 | { |
c9895cb6 WAA |
75 | struct sockaddr_in *a, *b; |
76 | struct sockaddr_in6 *a6, *b6; | |
16b374ca | 77 | |
14f9a607 WAA |
78 | if (addr1->sa_family != addr2->sa_family) |
79 | return false; | |
80 | ||
81 | switch (addr1->sa_family) { | |
82 | case AF_INET: | |
83 | a = (struct sockaddr_in *)addr1; | |
84 | b = (struct sockaddr_in *)addr2; | |
85 | ||
86 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
87 | a->sin_port == b->sin_port) | |
88 | return true; | |
89 | break; | |
90 | ||
91 | case AF_INET6: | |
92 | a6 = (struct sockaddr_in6 *)addr1; | |
93 | b6 = (struct sockaddr_in6 *)addr2; | |
94 | ||
95 | /* LINKLOCAL addresses must have matching scope_id */ | |
96 | if (ipv6_addr_scope(&a6->sin6_addr) == | |
97 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
98 | a6->sin6_scope_id != b6->sin6_scope_id) | |
99 | return false; | |
100 | ||
101 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
102 | a6->sin6_port == b6->sin6_port) | |
103 | return true; | |
104 | break; | |
105 | ||
106 | default: | |
107 | dprintk("%s: unhandled address family: %u\n", | |
108 | __func__, addr1->sa_family); | |
109 | return false; | |
110 | } | |
111 | ||
112 | return false; | |
113 | } | |
114 | ||
17280175 | 115 | static bool |
2d3fe01c WAA |
116 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, |
117 | const struct list_head *dsaddrs2) | |
14f9a607 | 118 | { |
14f9a607 WAA |
119 | struct nfs4_pnfs_ds_addr *da1, *da2; |
120 | ||
2d3fe01c WAA |
121 | /* step through both lists, comparing as we go */ |
122 | for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node), | |
123 | da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node); | |
124 | da1 != NULL && da2 != NULL; | |
125 | da1 = list_entry(da1->da_node.next, typeof(*da1), da_node), | |
126 | da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) { | |
127 | if (!same_sockaddr((struct sockaddr *)&da1->da_addr, | |
128 | (struct sockaddr *)&da2->da_addr)) | |
129 | return false; | |
16b374ca | 130 | } |
2d3fe01c WAA |
131 | if (da1 == NULL && da2 == NULL) |
132 | return true; | |
133 | ||
134 | return false; | |
16b374ca AA |
135 | } |
136 | ||
14f9a607 | 137 | /* |
2d3fe01c | 138 | * Lookup DS by addresses. nfs4_ds_cache_lock is held |
14f9a607 | 139 | */ |
2d3fe01c WAA |
140 | static struct nfs4_pnfs_ds * |
141 | _data_server_lookup_locked(const struct list_head *dsaddrs) | |
14f9a607 | 142 | { |
2d3fe01c | 143 | struct nfs4_pnfs_ds *ds; |
14f9a607 | 144 | |
2d3fe01c WAA |
145 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) |
146 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) | |
147 | return ds; | |
148 | return NULL; | |
14f9a607 WAA |
149 | } |
150 | ||
d83217c1 AA |
151 | /* |
152 | * Create an rpc connection to the nfs4_pnfs_ds data server | |
35dbbc99 | 153 | * Currently only supports IPv4 and IPv6 addresses |
d83217c1 AA |
154 | */ |
155 | static int | |
156 | nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) | |
157 | { | |
7e574f0d | 158 | struct nfs_client *clp = ERR_PTR(-EIO); |
14f9a607 | 159 | struct nfs4_pnfs_ds_addr *da; |
d83217c1 AA |
160 | int status = 0; |
161 | ||
14f9a607 | 162 | dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr, |
d83217c1 AA |
163 | mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor); |
164 | ||
14f9a607 WAA |
165 | BUG_ON(list_empty(&ds->ds_addrs)); |
166 | ||
7e574f0d WAA |
167 | list_for_each_entry(da, &ds->ds_addrs, da_node) { |
168 | dprintk("%s: DS %s: trying address %s\n", | |
169 | __func__, ds->ds_remotestr, da->da_remotestr); | |
14f9a607 | 170 | |
7e574f0d | 171 | clp = nfs4_set_ds_client(mds_srv->nfs_client, |
98fc685a AA |
172 | (struct sockaddr *)&da->da_addr, |
173 | da->da_addrlen, IPPROTO_TCP, | |
174 | dataserver_timeo, dataserver_retrans); | |
7e574f0d WAA |
175 | if (!IS_ERR(clp)) |
176 | break; | |
177 | } | |
178 | ||
d83217c1 AA |
179 | if (IS_ERR(clp)) { |
180 | status = PTR_ERR(clp); | |
181 | goto out; | |
182 | } | |
183 | ||
184 | if ((clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) != 0) { | |
185 | if (!is_ds_client(clp)) { | |
186 | status = -ENODEV; | |
187 | goto out_put; | |
188 | } | |
189 | ds->ds_clp = clp; | |
c9895cb6 WAA |
190 | dprintk("%s [existing] server=%s\n", __func__, |
191 | ds->ds_remotestr); | |
d83217c1 AA |
192 | goto out; |
193 | } | |
194 | ||
195 | /* | |
196 | * Do not set NFS_CS_CHECK_LEASE_TIME instead set the DS lease to | |
197 | * be equal to the MDS lease. Renewal is scheduled in create_session. | |
198 | */ | |
199 | spin_lock(&mds_srv->nfs_client->cl_lock); | |
200 | clp->cl_lease_time = mds_srv->nfs_client->cl_lease_time; | |
201 | spin_unlock(&mds_srv->nfs_client->cl_lock); | |
202 | clp->cl_last_renewal = jiffies; | |
203 | ||
204 | /* New nfs_client */ | |
205 | status = nfs4_init_ds_session(clp); | |
206 | if (status) | |
207 | goto out_put; | |
208 | ||
209 | ds->ds_clp = clp; | |
c9895cb6 | 210 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); |
d83217c1 AA |
211 | out: |
212 | return status; | |
213 | out_put: | |
214 | nfs_put_client(clp); | |
215 | goto out; | |
216 | } | |
217 | ||
16b374ca AA |
218 | static void |
219 | destroy_ds(struct nfs4_pnfs_ds *ds) | |
220 | { | |
14f9a607 WAA |
221 | struct nfs4_pnfs_ds_addr *da; |
222 | ||
16b374ca AA |
223 | dprintk("--> %s\n", __func__); |
224 | ifdebug(FACILITY) | |
225 | print_ds(ds); | |
226 | ||
227 | if (ds->ds_clp) | |
228 | nfs_put_client(ds->ds_clp); | |
14f9a607 WAA |
229 | |
230 | while (!list_empty(&ds->ds_addrs)) { | |
231 | da = list_first_entry(&ds->ds_addrs, | |
232 | struct nfs4_pnfs_ds_addr, | |
233 | da_node); | |
234 | list_del_init(&da->da_node); | |
235 | kfree(da->da_remotestr); | |
236 | kfree(da); | |
237 | } | |
238 | ||
c9895cb6 | 239 | kfree(ds->ds_remotestr); |
16b374ca AA |
240 | kfree(ds); |
241 | } | |
242 | ||
1775bc34 | 243 | void |
16b374ca AA |
244 | nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) |
245 | { | |
246 | struct nfs4_pnfs_ds *ds; | |
247 | int i; | |
248 | ||
a1eaecbc | 249 | nfs4_print_deviceid(&dsaddr->id_node.deviceid); |
16b374ca AA |
250 | |
251 | for (i = 0; i < dsaddr->ds_num; i++) { | |
252 | ds = dsaddr->ds_list[i]; | |
253 | if (ds != NULL) { | |
254 | if (atomic_dec_and_lock(&ds->ds_count, | |
255 | &nfs4_ds_cache_lock)) { | |
256 | list_del_init(&ds->ds_node); | |
257 | spin_unlock(&nfs4_ds_cache_lock); | |
258 | destroy_ds(ds); | |
259 | } | |
260 | } | |
261 | } | |
262 | kfree(dsaddr->stripe_indices); | |
263 | kfree(dsaddr); | |
264 | } | |
265 | ||
c9895cb6 WAA |
266 | /* |
267 | * Create a string with a human readable address and port to avoid | |
268 | * complicated setup around many dprinks. | |
269 | */ | |
270 | static char * | |
14f9a607 | 271 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) |
c9895cb6 | 272 | { |
14f9a607 | 273 | struct nfs4_pnfs_ds_addr *da; |
c9895cb6 | 274 | char *remotestr; |
c9895cb6 | 275 | size_t len; |
14f9a607 | 276 | char *p; |
c9895cb6 | 277 | |
14f9a607 WAA |
278 | len = 3; /* '{', '}' and eol */ |
279 | list_for_each_entry(da, dsaddrs, da_node) { | |
280 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
c9895cb6 WAA |
281 | } |
282 | ||
14f9a607 WAA |
283 | remotestr = kzalloc(len, gfp_flags); |
284 | if (!remotestr) | |
c9895cb6 | 285 | return NULL; |
c9895cb6 | 286 | |
14f9a607 WAA |
287 | p = remotestr; |
288 | *(p++) = '{'; | |
289 | len--; | |
290 | list_for_each_entry(da, dsaddrs, da_node) { | |
291 | size_t ll = strlen(da->da_remotestr); | |
c9895cb6 | 292 | |
14f9a607 WAA |
293 | if (ll > len) |
294 | goto out_err; | |
c9895cb6 | 295 | |
14f9a607 WAA |
296 | memcpy(p, da->da_remotestr, ll); |
297 | p += ll; | |
298 | len -= ll; | |
c9895cb6 | 299 | |
14f9a607 WAA |
300 | if (len < 1) |
301 | goto out_err; | |
302 | (*p++) = ','; | |
303 | len--; | |
304 | } | |
305 | if (len < 2) | |
306 | goto out_err; | |
307 | *(p++) = '}'; | |
308 | *p = '\0'; | |
c9895cb6 | 309 | return remotestr; |
14f9a607 WAA |
310 | out_err: |
311 | kfree(remotestr); | |
312 | return NULL; | |
c9895cb6 WAA |
313 | } |
314 | ||
16b374ca | 315 | static struct nfs4_pnfs_ds * |
14f9a607 | 316 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) |
16b374ca | 317 | { |
c9895cb6 WAA |
318 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; |
319 | char *remotestr; | |
16b374ca | 320 | |
14f9a607 WAA |
321 | if (list_empty(dsaddrs)) { |
322 | dprintk("%s: no addresses defined\n", __func__); | |
323 | goto out; | |
324 | } | |
325 | ||
326 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
16b374ca AA |
327 | if (!ds) |
328 | goto out; | |
329 | ||
c9895cb6 | 330 | /* this is only used for debugging, so it's ok if its NULL */ |
14f9a607 | 331 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); |
c9895cb6 | 332 | |
16b374ca | 333 | spin_lock(&nfs4_ds_cache_lock); |
14f9a607 | 334 | tmp_ds = _data_server_lookup_locked(dsaddrs); |
16b374ca | 335 | if (tmp_ds == NULL) { |
14f9a607 WAA |
336 | INIT_LIST_HEAD(&ds->ds_addrs); |
337 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
c9895cb6 | 338 | ds->ds_remotestr = remotestr; |
16b374ca AA |
339 | atomic_set(&ds->ds_count, 1); |
340 | INIT_LIST_HEAD(&ds->ds_node); | |
341 | ds->ds_clp = NULL; | |
342 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
c9895cb6 WAA |
343 | dprintk("%s add new data server %s\n", __func__, |
344 | ds->ds_remotestr); | |
16b374ca | 345 | } else { |
c9895cb6 | 346 | kfree(remotestr); |
16b374ca AA |
347 | kfree(ds); |
348 | atomic_inc(&tmp_ds->ds_count); | |
c9895cb6 WAA |
349 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", |
350 | __func__, tmp_ds->ds_remotestr, | |
16b374ca AA |
351 | atomic_read(&tmp_ds->ds_count)); |
352 | ds = tmp_ds; | |
353 | } | |
354 | spin_unlock(&nfs4_ds_cache_lock); | |
355 | out: | |
356 | return ds; | |
357 | } | |
358 | ||
359 | /* | |
c9895cb6 | 360 | * Currently only supports ipv4, ipv6 and one multi-path address. |
16b374ca | 361 | */ |
14f9a607 | 362 | static struct nfs4_pnfs_ds_addr * |
17094272 | 363 | decode_ds_addr(struct net *net, struct xdr_stream *streamp, gfp_t gfp_flags) |
16b374ca | 364 | { |
14f9a607 | 365 | struct nfs4_pnfs_ds_addr *da = NULL; |
c9895cb6 | 366 | char *buf, *portstr; |
13fff2f3 | 367 | __be16 port; |
c9895cb6 | 368 | int nlen, rlen; |
16b374ca | 369 | int tmp[2]; |
35124a09 | 370 | __be32 *p; |
c9895cb6 | 371 | char *netid, *match_netid; |
14f9a607 WAA |
372 | size_t len, match_netid_len; |
373 | char *startsep = ""; | |
374 | char *endsep = ""; | |
375 | ||
16b374ca AA |
376 | |
377 | /* r_netid */ | |
35124a09 WAA |
378 | p = xdr_inline_decode(streamp, 4); |
379 | if (unlikely(!p)) | |
380 | goto out_err; | |
16b374ca | 381 | nlen = be32_to_cpup(p++); |
16b374ca | 382 | |
35124a09 WAA |
383 | p = xdr_inline_decode(streamp, nlen); |
384 | if (unlikely(!p)) | |
385 | goto out_err; | |
16b374ca | 386 | |
c9895cb6 WAA |
387 | netid = kmalloc(nlen+1, gfp_flags); |
388 | if (unlikely(!netid)) | |
16b374ca | 389 | goto out_err; |
16b374ca | 390 | |
c9895cb6 WAA |
391 | netid[nlen] = '\0'; |
392 | memcpy(netid, p, nlen); | |
393 | ||
394 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
35124a09 WAA |
395 | p = xdr_inline_decode(streamp, 4); |
396 | if (unlikely(!p)) | |
c9895cb6 | 397 | goto out_free_netid; |
35124a09 WAA |
398 | rlen = be32_to_cpup(p); |
399 | ||
400 | p = xdr_inline_decode(streamp, rlen); | |
401 | if (unlikely(!p)) | |
c9895cb6 | 402 | goto out_free_netid; |
35124a09 | 403 | |
c9895cb6 WAA |
404 | /* port is ".ABC.DEF", 8 chars max */ |
405 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
ad3d2eed | 406 | dprintk("%s: Invalid address, length %d\n", __func__, |
16b374ca | 407 | rlen); |
c9895cb6 | 408 | goto out_free_netid; |
16b374ca | 409 | } |
a75b9df9 | 410 | buf = kmalloc(rlen + 1, gfp_flags); |
b9f81057 SF |
411 | if (!buf) { |
412 | dprintk("%s: Not enough memory\n", __func__); | |
c9895cb6 | 413 | goto out_free_netid; |
b9f81057 | 414 | } |
16b374ca | 415 | buf[rlen] = '\0'; |
35124a09 | 416 | memcpy(buf, p, rlen); |
16b374ca | 417 | |
c9895cb6 WAA |
418 | /* replace port '.' with '-' */ |
419 | portstr = strrchr(buf, '.'); | |
420 | if (!portstr) { | |
421 | dprintk("%s: Failed finding expected dot in port\n", | |
422 | __func__); | |
423 | goto out_free_buf; | |
424 | } | |
425 | *portstr = '-'; | |
426 | ||
427 | /* find '.' between address and port */ | |
428 | portstr = strrchr(buf, '.'); | |
429 | if (!portstr) { | |
430 | dprintk("%s: Failed finding expected dot between address and " | |
431 | "port\n", __func__); | |
432 | goto out_free_buf; | |
16b374ca | 433 | } |
c9895cb6 | 434 | *portstr = '\0'; |
16b374ca | 435 | |
14f9a607 WAA |
436 | da = kzalloc(sizeof(*da), gfp_flags); |
437 | if (unlikely(!da)) | |
c9895cb6 | 438 | goto out_free_buf; |
14f9a607 WAA |
439 | |
440 | INIT_LIST_HEAD(&da->da_node); | |
441 | ||
17094272 | 442 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, |
14f9a607 WAA |
443 | sizeof(da->da_addr))) { |
444 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
445 | goto out_free_da; | |
16b374ca AA |
446 | } |
447 | ||
c9895cb6 WAA |
448 | portstr++; |
449 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
16b374ca AA |
450 | port = htons((tmp[0] << 8) | (tmp[1])); |
451 | ||
14f9a607 | 452 | switch (da->da_addr.ss_family) { |
c9895cb6 | 453 | case AF_INET: |
14f9a607 WAA |
454 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; |
455 | da->da_addrlen = sizeof(struct sockaddr_in); | |
c9895cb6 WAA |
456 | match_netid = "tcp"; |
457 | match_netid_len = 3; | |
458 | break; | |
459 | ||
460 | case AF_INET6: | |
14f9a607 WAA |
461 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; |
462 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
c9895cb6 WAA |
463 | match_netid = "tcp6"; |
464 | match_netid_len = 4; | |
14f9a607 WAA |
465 | startsep = "["; |
466 | endsep = "]"; | |
c9895cb6 WAA |
467 | break; |
468 | ||
469 | default: | |
470 | dprintk("%s: unsupported address family: %u\n", | |
14f9a607 WAA |
471 | __func__, da->da_addr.ss_family); |
472 | goto out_free_da; | |
c9895cb6 WAA |
473 | } |
474 | ||
475 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
476 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
477 | __func__, netid, match_netid); | |
14f9a607 | 478 | goto out_free_da; |
c9895cb6 WAA |
479 | } |
480 | ||
14f9a607 WAA |
481 | /* save human readable address */ |
482 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
483 | da->da_remotestr = kzalloc(len, gfp_flags); | |
484 | ||
485 | /* NULL is ok, only used for dprintk */ | |
486 | if (da->da_remotestr) | |
487 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
488 | buf, endsep, ntohs(port)); | |
489 | ||
490 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
491 | kfree(buf); | |
492 | kfree(netid); | |
493 | return da; | |
494 | ||
495 | out_free_da: | |
496 | kfree(da); | |
c9895cb6 | 497 | out_free_buf: |
14f9a607 | 498 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); |
16b374ca | 499 | kfree(buf); |
c9895cb6 WAA |
500 | out_free_netid: |
501 | kfree(netid); | |
16b374ca | 502 | out_err: |
14f9a607 | 503 | return NULL; |
16b374ca AA |
504 | } |
505 | ||
506 | /* Decode opaque device data and return the result */ | |
507 | static struct nfs4_file_layout_dsaddr* | |
a75b9df9 | 508 | decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags) |
16b374ca | 509 | { |
35124a09 | 510 | int i; |
16b374ca AA |
511 | u32 cnt, num; |
512 | u8 *indexp; | |
35124a09 WAA |
513 | __be32 *p; |
514 | u8 *stripe_indices; | |
515 | u8 max_stripe_index; | |
516 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; | |
517 | struct xdr_stream stream; | |
f7da7a12 | 518 | struct xdr_buf buf; |
35124a09 | 519 | struct page *scratch; |
14f9a607 WAA |
520 | struct list_head dsaddrs; |
521 | struct nfs4_pnfs_ds_addr *da; | |
35124a09 WAA |
522 | |
523 | /* set up xdr stream */ | |
a75b9df9 | 524 | scratch = alloc_page(gfp_flags); |
35124a09 WAA |
525 | if (!scratch) |
526 | goto out_err; | |
527 | ||
f7da7a12 | 528 | xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen); |
35124a09 | 529 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
16b374ca AA |
530 | |
531 | /* Get the stripe count (number of stripe index) */ | |
35124a09 WAA |
532 | p = xdr_inline_decode(&stream, 4); |
533 | if (unlikely(!p)) | |
534 | goto out_err_free_scratch; | |
535 | ||
536 | cnt = be32_to_cpup(p); | |
16b374ca AA |
537 | dprintk("%s stripe count %d\n", __func__, cnt); |
538 | if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) { | |
a030889a | 539 | printk(KERN_WARNING "NFS: %s: stripe count %d greater than " |
16b374ca AA |
540 | "supported maximum %d\n", __func__, |
541 | cnt, NFS4_PNFS_MAX_STRIPE_CNT); | |
35124a09 WAA |
542 | goto out_err_free_scratch; |
543 | } | |
544 | ||
545 | /* read stripe indices */ | |
a75b9df9 | 546 | stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags); |
35124a09 WAA |
547 | if (!stripe_indices) |
548 | goto out_err_free_scratch; | |
549 | ||
550 | p = xdr_inline_decode(&stream, cnt << 2); | |
551 | if (unlikely(!p)) | |
552 | goto out_err_free_stripe_indices; | |
553 | ||
554 | indexp = &stripe_indices[0]; | |
555 | max_stripe_index = 0; | |
556 | for (i = 0; i < cnt; i++) { | |
557 | *indexp = be32_to_cpup(p++); | |
558 | max_stripe_index = max(max_stripe_index, *indexp); | |
559 | indexp++; | |
16b374ca AA |
560 | } |
561 | ||
562 | /* Check the multipath list count */ | |
35124a09 WAA |
563 | p = xdr_inline_decode(&stream, 4); |
564 | if (unlikely(!p)) | |
565 | goto out_err_free_stripe_indices; | |
566 | ||
567 | num = be32_to_cpup(p); | |
16b374ca AA |
568 | dprintk("%s ds_num %u\n", __func__, num); |
569 | if (num > NFS4_PNFS_MAX_MULTI_CNT) { | |
a030889a | 570 | printk(KERN_WARNING "NFS: %s: multipath count %d greater than " |
16b374ca AA |
571 | "supported maximum %d\n", __func__, |
572 | num, NFS4_PNFS_MAX_MULTI_CNT); | |
35124a09 | 573 | goto out_err_free_stripe_indices; |
16b374ca | 574 | } |
35124a09 WAA |
575 | |
576 | /* validate stripe indices are all < num */ | |
577 | if (max_stripe_index >= num) { | |
a030889a | 578 | printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n", |
35124a09 WAA |
579 | __func__, max_stripe_index, num); |
580 | goto out_err_free_stripe_indices; | |
581 | } | |
582 | ||
16b374ca AA |
583 | dsaddr = kzalloc(sizeof(*dsaddr) + |
584 | (sizeof(struct nfs4_pnfs_ds *) * (num - 1)), | |
a75b9df9 | 585 | gfp_flags); |
16b374ca | 586 | if (!dsaddr) |
35124a09 | 587 | goto out_err_free_stripe_indices; |
16b374ca AA |
588 | |
589 | dsaddr->stripe_count = cnt; | |
35124a09 WAA |
590 | dsaddr->stripe_indices = stripe_indices; |
591 | stripe_indices = NULL; | |
16b374ca | 592 | dsaddr->ds_num = num; |
1775bc34 BH |
593 | nfs4_init_deviceid_node(&dsaddr->id_node, |
594 | NFS_SERVER(ino)->pnfs_curr_ld, | |
595 | NFS_SERVER(ino)->nfs_client, | |
a1eaecbc | 596 | &pdev->dev_id); |
16b374ca | 597 | |
14f9a607 WAA |
598 | INIT_LIST_HEAD(&dsaddrs); |
599 | ||
16b374ca AA |
600 | for (i = 0; i < dsaddr->ds_num; i++) { |
601 | int j; | |
35124a09 WAA |
602 | u32 mp_count; |
603 | ||
604 | p = xdr_inline_decode(&stream, 4); | |
605 | if (unlikely(!p)) | |
606 | goto out_err_free_deviceid; | |
16b374ca | 607 | |
35124a09 | 608 | mp_count = be32_to_cpup(p); /* multipath count */ |
35124a09 | 609 | for (j = 0; j < mp_count; j++) { |
17094272 SK |
610 | da = decode_ds_addr(NFS_SERVER(ino)->nfs_client->net, |
611 | &stream, gfp_flags); | |
14f9a607 WAA |
612 | if (da) |
613 | list_add_tail(&da->da_node, &dsaddrs); | |
614 | } | |
615 | if (list_empty(&dsaddrs)) { | |
616 | dprintk("%s: no suitable DS addresses found\n", | |
617 | __func__); | |
618 | goto out_err_free_deviceid; | |
619 | } | |
620 | ||
621 | dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags); | |
622 | if (!dsaddr->ds_list[i]) | |
623 | goto out_err_drain_dsaddrs; | |
624 | ||
625 | /* If DS was already in cache, free ds addrs */ | |
626 | while (!list_empty(&dsaddrs)) { | |
627 | da = list_first_entry(&dsaddrs, | |
628 | struct nfs4_pnfs_ds_addr, | |
629 | da_node); | |
630 | list_del_init(&da->da_node); | |
631 | kfree(da->da_remotestr); | |
632 | kfree(da); | |
16b374ca AA |
633 | } |
634 | } | |
35124a09 WAA |
635 | |
636 | __free_page(scratch); | |
16b374ca AA |
637 | return dsaddr; |
638 | ||
14f9a607 WAA |
639 | out_err_drain_dsaddrs: |
640 | while (!list_empty(&dsaddrs)) { | |
641 | da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr, | |
642 | da_node); | |
643 | list_del_init(&da->da_node); | |
644 | kfree(da->da_remotestr); | |
645 | kfree(da); | |
646 | } | |
35124a09 | 647 | out_err_free_deviceid: |
16b374ca | 648 | nfs4_fl_free_deviceid(dsaddr); |
35124a09 WAA |
649 | /* stripe_indicies was part of dsaddr */ |
650 | goto out_err_free_scratch; | |
651 | out_err_free_stripe_indices: | |
652 | kfree(stripe_indices); | |
653 | out_err_free_scratch: | |
654 | __free_page(scratch); | |
16b374ca AA |
655 | out_err: |
656 | dprintk("%s ERROR: returning NULL\n", __func__); | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | /* | |
ea8eecdd CH |
661 | * Decode the opaque device specified in 'dev' and add it to the cache of |
662 | * available devices. | |
16b374ca | 663 | */ |
ea8eecdd | 664 | static struct nfs4_file_layout_dsaddr * |
a75b9df9 | 665 | decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags) |
16b374ca | 666 | { |
a1eaecbc BH |
667 | struct nfs4_deviceid_node *d; |
668 | struct nfs4_file_layout_dsaddr *n, *new; | |
16b374ca | 669 | |
a75b9df9 | 670 | new = decode_device(inode, dev, gfp_flags); |
ea8eecdd | 671 | if (!new) { |
a030889a | 672 | printk(KERN_WARNING "NFS: %s: Could not decode or add device\n", |
16b374ca AA |
673 | __func__); |
674 | return NULL; | |
675 | } | |
676 | ||
a1eaecbc BH |
677 | d = nfs4_insert_deviceid_node(&new->id_node); |
678 | n = container_of(d, struct nfs4_file_layout_dsaddr, id_node); | |
679 | if (n != new) { | |
ea8eecdd | 680 | nfs4_fl_free_deviceid(new); |
a1eaecbc | 681 | return n; |
ea8eecdd CH |
682 | } |
683 | ||
ea8eecdd | 684 | return new; |
16b374ca AA |
685 | } |
686 | ||
687 | /* | |
688 | * Retrieve the information for dev_id, add it to the list | |
689 | * of available devices, and return it. | |
690 | */ | |
691 | struct nfs4_file_layout_dsaddr * | |
a75b9df9 | 692 | get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags) |
16b374ca AA |
693 | { |
694 | struct pnfs_device *pdev = NULL; | |
695 | u32 max_resp_sz; | |
696 | int max_pages; | |
697 | struct page **pages = NULL; | |
698 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; | |
699 | int rc, i; | |
700 | struct nfs_server *server = NFS_SERVER(inode); | |
701 | ||
702 | /* | |
703 | * Use the session max response size as the basis for setting | |
704 | * GETDEVICEINFO's maxcount | |
705 | */ | |
706 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
e5265a0c | 707 | max_pages = nfs_page_array_len(0, max_resp_sz); |
16b374ca AA |
708 | dprintk("%s inode %p max_resp_sz %u max_pages %d\n", |
709 | __func__, inode, max_resp_sz, max_pages); | |
710 | ||
a75b9df9 | 711 | pdev = kzalloc(sizeof(struct pnfs_device), gfp_flags); |
16b374ca AA |
712 | if (pdev == NULL) |
713 | return NULL; | |
714 | ||
a75b9df9 | 715 | pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags); |
16b374ca AA |
716 | if (pages == NULL) { |
717 | kfree(pdev); | |
718 | return NULL; | |
719 | } | |
720 | for (i = 0; i < max_pages; i++) { | |
a75b9df9 | 721 | pages[i] = alloc_page(gfp_flags); |
16b374ca AA |
722 | if (!pages[i]) |
723 | goto out_free; | |
724 | } | |
725 | ||
16b374ca AA |
726 | memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id)); |
727 | pdev->layout_type = LAYOUT_NFSV4_1_FILES; | |
728 | pdev->pages = pages; | |
729 | pdev->pgbase = 0; | |
730 | pdev->pglen = PAGE_SIZE * max_pages; | |
731 | pdev->mincount = 0; | |
732 | ||
733 | rc = nfs4_proc_getdeviceinfo(server, pdev); | |
734 | dprintk("%s getdevice info returns %d\n", __func__, rc); | |
735 | if (rc) | |
736 | goto out_free; | |
737 | ||
738 | /* | |
739 | * Found new device, need to decode it and then add it to the | |
740 | * list of known devices for this mountpoint. | |
741 | */ | |
a75b9df9 | 742 | dsaddr = decode_and_add_device(inode, pdev, gfp_flags); |
16b374ca | 743 | out_free: |
16b374ca AA |
744 | for (i = 0; i < max_pages; i++) |
745 | __free_page(pages[i]); | |
746 | kfree(pages); | |
747 | kfree(pdev); | |
748 | dprintk("<-- %s dsaddr %p\n", __func__, dsaddr); | |
749 | return dsaddr; | |
750 | } | |
751 | ||
ea8eecdd CH |
752 | void |
753 | nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) | |
16b374ca | 754 | { |
1775bc34 | 755 | nfs4_put_deviceid_node(&dsaddr->id_node); |
16b374ca | 756 | } |
cfe7f412 FI |
757 | |
758 | /* | |
759 | * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit | |
760 | * Then: ((res + fsi) % dsaddr->stripe_count) | |
761 | */ | |
762 | u32 | |
763 | nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset) | |
764 | { | |
765 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
766 | u64 tmp; | |
767 | ||
768 | tmp = offset - flseg->pattern_offset; | |
769 | do_div(tmp, flseg->stripe_unit); | |
770 | tmp += flseg->first_stripe_index; | |
771 | return do_div(tmp, flseg->dsaddr->stripe_count); | |
772 | } | |
773 | ||
774 | u32 | |
775 | nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j) | |
776 | { | |
777 | return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j]; | |
778 | } | |
779 | ||
780 | struct nfs_fh * | |
781 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j) | |
782 | { | |
783 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
784 | u32 i; | |
785 | ||
786 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
787 | if (flseg->num_fh == 1) | |
788 | i = 0; | |
789 | else if (flseg->num_fh == 0) | |
790 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
791 | return NULL; | |
792 | else | |
793 | i = nfs4_fl_calc_ds_index(lseg, j); | |
794 | } else | |
795 | i = j; | |
796 | return flseg->fh_array[i]; | |
797 | } | |
798 | ||
799 | struct nfs4_pnfs_ds * | |
800 | nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx) | |
801 | { | |
802 | struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr; | |
803 | struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx]; | |
554d458d AA |
804 | struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); |
805 | ||
806 | if (filelayout_test_devid_invalid(devid)) | |
807 | return NULL; | |
cfe7f412 FI |
808 | |
809 | if (ds == NULL) { | |
a030889a | 810 | printk(KERN_ERR "NFS: %s: No data server for offset index %d\n", |
cfe7f412 | 811 | __func__, ds_idx); |
554d458d | 812 | goto mark_dev_invalid; |
cfe7f412 FI |
813 | } |
814 | ||
815 | if (!ds->ds_clp) { | |
568e8c49 | 816 | struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode); |
cfe7f412 FI |
817 | int err; |
818 | ||
568e8c49 | 819 | err = nfs4_ds_connect(s, ds); |
554d458d AA |
820 | if (err) |
821 | goto mark_dev_invalid; | |
cfe7f412 FI |
822 | } |
823 | return ds; | |
554d458d AA |
824 | |
825 | mark_dev_invalid: | |
826 | filelayout_mark_devid_invalid(devid); | |
827 | return NULL; | |
cfe7f412 | 828 | } |
98fc685a AA |
829 | |
830 | module_param(dataserver_retrans, uint, 0644); | |
831 | MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client " | |
832 | "retries a request before it attempts further " | |
833 | " recovery action."); | |
834 | module_param(dataserver_timeo, uint, 0644); | |
835 | MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the " | |
836 | "NFSv4.1 client waits for a response from a " | |
837 | " data server before it retries an NFS request."); |