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> | |
33 | ||
34 | #include "internal.h" | |
35 | #include "nfs4filelayout.h" | |
36 | ||
37 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
38 | ||
39 | /* | |
40 | * Data server cache | |
41 | * | |
42 | * Data servers can be mapped to different device ids. | |
43 | * nfs4_pnfs_ds reference counting | |
44 | * - set to 1 on allocation | |
45 | * - incremented when a device id maps a data server already in the cache. | |
46 | * - decremented when deviceid is removed from the cache. | |
47 | */ | |
48 | DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
49 | static LIST_HEAD(nfs4_data_server_cache); | |
50 | ||
51 | /* Debug routines */ | |
52 | void | |
53 | print_ds(struct nfs4_pnfs_ds *ds) | |
54 | { | |
55 | if (ds == NULL) { | |
56 | printk("%s NULL device\n", __func__); | |
57 | return; | |
58 | } | |
c9895cb6 | 59 | printk(" ds %s\n" |
16b374ca AA |
60 | " ref count %d\n" |
61 | " client %p\n" | |
62 | " cl_exchange_flags %x\n", | |
c9895cb6 | 63 | ds->ds_remotestr, |
16b374ca AA |
64 | atomic_read(&ds->ds_count), ds->ds_clp, |
65 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); | |
66 | } | |
67 | ||
14f9a607 WAA |
68 | static bool |
69 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
16b374ca | 70 | { |
c9895cb6 WAA |
71 | struct sockaddr_in *a, *b; |
72 | struct sockaddr_in6 *a6, *b6; | |
16b374ca | 73 | |
14f9a607 WAA |
74 | if (addr1->sa_family != addr2->sa_family) |
75 | return false; | |
76 | ||
77 | switch (addr1->sa_family) { | |
78 | case AF_INET: | |
79 | a = (struct sockaddr_in *)addr1; | |
80 | b = (struct sockaddr_in *)addr2; | |
81 | ||
82 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
83 | a->sin_port == b->sin_port) | |
84 | return true; | |
85 | break; | |
86 | ||
87 | case AF_INET6: | |
88 | a6 = (struct sockaddr_in6 *)addr1; | |
89 | b6 = (struct sockaddr_in6 *)addr2; | |
90 | ||
91 | /* LINKLOCAL addresses must have matching scope_id */ | |
92 | if (ipv6_addr_scope(&a6->sin6_addr) == | |
93 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
94 | a6->sin6_scope_id != b6->sin6_scope_id) | |
95 | return false; | |
96 | ||
97 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
98 | a6->sin6_port == b6->sin6_port) | |
99 | return true; | |
100 | break; | |
101 | ||
102 | default: | |
103 | dprintk("%s: unhandled address family: %u\n", | |
104 | __func__, addr1->sa_family); | |
105 | return false; | |
106 | } | |
107 | ||
108 | return false; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Lookup DS by addresses. The first matching address returns true. | |
113 | * nfs4_ds_cache_lock is held | |
114 | */ | |
115 | static struct nfs4_pnfs_ds * | |
116 | _data_server_lookup_locked(struct list_head *dsaddrs) | |
117 | { | |
118 | struct nfs4_pnfs_ds *ds; | |
119 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
120 | ||
121 | list_for_each_entry(da1, dsaddrs, da_node) { | |
122 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) { | |
123 | list_for_each_entry(da2, &ds->ds_addrs, da_node) { | |
124 | if (same_sockaddr( | |
125 | (struct sockaddr *)&da1->da_addr, | |
126 | (struct sockaddr *)&da2->da_addr)) | |
127 | return ds; | |
128 | } | |
16b374ca AA |
129 | } |
130 | } | |
131 | return NULL; | |
132 | } | |
133 | ||
14f9a607 WAA |
134 | /* |
135 | * Compare two lists of addresses. | |
136 | */ | |
137 | static bool | |
138 | _data_server_match_all_addrs_locked(struct list_head *dsaddrs1, | |
139 | struct list_head *dsaddrs2) | |
140 | { | |
141 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
142 | size_t count1 = 0, | |
143 | count2 = 0; | |
144 | ||
145 | list_for_each_entry(da1, dsaddrs1, da_node) | |
146 | count1++; | |
147 | ||
148 | list_for_each_entry(da2, dsaddrs2, da_node) { | |
149 | bool found = false; | |
150 | count2++; | |
151 | list_for_each_entry(da1, dsaddrs1, da_node) { | |
152 | if (same_sockaddr((struct sockaddr *)&da1->da_addr, | |
153 | (struct sockaddr *)&da2->da_addr)) { | |
154 | found = true; | |
155 | break; | |
156 | } | |
157 | } | |
158 | if (!found) | |
159 | return false; | |
160 | } | |
161 | ||
162 | return (count1 == count2); | |
163 | } | |
164 | ||
d83217c1 AA |
165 | /* |
166 | * Create an rpc connection to the nfs4_pnfs_ds data server | |
167 | * Currently only support IPv4 | |
168 | */ | |
169 | static int | |
170 | nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) | |
171 | { | |
172 | struct nfs_client *clp; | |
14f9a607 | 173 | struct nfs4_pnfs_ds_addr *da; |
d83217c1 AA |
174 | int status = 0; |
175 | ||
14f9a607 | 176 | dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr, |
d83217c1 AA |
177 | mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor); |
178 | ||
14f9a607 WAA |
179 | BUG_ON(list_empty(&ds->ds_addrs)); |
180 | ||
181 | da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); | |
182 | dprintk("%s: using the first address for DS %s: %s\n", | |
183 | __func__, ds->ds_remotestr, da->da_remotestr); | |
184 | ||
c9895cb6 | 185 | clp = nfs4_set_ds_client(mds_srv->nfs_client, |
14f9a607 WAA |
186 | (struct sockaddr *)&da->da_addr, |
187 | da->da_addrlen, IPPROTO_TCP); | |
d83217c1 AA |
188 | if (IS_ERR(clp)) { |
189 | status = PTR_ERR(clp); | |
190 | goto out; | |
191 | } | |
192 | ||
193 | if ((clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) != 0) { | |
194 | if (!is_ds_client(clp)) { | |
195 | status = -ENODEV; | |
196 | goto out_put; | |
197 | } | |
198 | ds->ds_clp = clp; | |
c9895cb6 WAA |
199 | dprintk("%s [existing] server=%s\n", __func__, |
200 | ds->ds_remotestr); | |
d83217c1 AA |
201 | goto out; |
202 | } | |
203 | ||
204 | /* | |
205 | * Do not set NFS_CS_CHECK_LEASE_TIME instead set the DS lease to | |
206 | * be equal to the MDS lease. Renewal is scheduled in create_session. | |
207 | */ | |
208 | spin_lock(&mds_srv->nfs_client->cl_lock); | |
209 | clp->cl_lease_time = mds_srv->nfs_client->cl_lease_time; | |
210 | spin_unlock(&mds_srv->nfs_client->cl_lock); | |
211 | clp->cl_last_renewal = jiffies; | |
212 | ||
213 | /* New nfs_client */ | |
214 | status = nfs4_init_ds_session(clp); | |
215 | if (status) | |
216 | goto out_put; | |
217 | ||
218 | ds->ds_clp = clp; | |
c9895cb6 | 219 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); |
d83217c1 AA |
220 | out: |
221 | return status; | |
222 | out_put: | |
223 | nfs_put_client(clp); | |
224 | goto out; | |
225 | } | |
226 | ||
16b374ca AA |
227 | static void |
228 | destroy_ds(struct nfs4_pnfs_ds *ds) | |
229 | { | |
14f9a607 WAA |
230 | struct nfs4_pnfs_ds_addr *da; |
231 | ||
16b374ca AA |
232 | dprintk("--> %s\n", __func__); |
233 | ifdebug(FACILITY) | |
234 | print_ds(ds); | |
235 | ||
236 | if (ds->ds_clp) | |
237 | nfs_put_client(ds->ds_clp); | |
14f9a607 WAA |
238 | |
239 | while (!list_empty(&ds->ds_addrs)) { | |
240 | da = list_first_entry(&ds->ds_addrs, | |
241 | struct nfs4_pnfs_ds_addr, | |
242 | da_node); | |
243 | list_del_init(&da->da_node); | |
244 | kfree(da->da_remotestr); | |
245 | kfree(da); | |
246 | } | |
247 | ||
c9895cb6 | 248 | kfree(ds->ds_remotestr); |
16b374ca AA |
249 | kfree(ds); |
250 | } | |
251 | ||
1775bc34 | 252 | void |
16b374ca AA |
253 | nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) |
254 | { | |
255 | struct nfs4_pnfs_ds *ds; | |
256 | int i; | |
257 | ||
a1eaecbc | 258 | nfs4_print_deviceid(&dsaddr->id_node.deviceid); |
16b374ca AA |
259 | |
260 | for (i = 0; i < dsaddr->ds_num; i++) { | |
261 | ds = dsaddr->ds_list[i]; | |
262 | if (ds != NULL) { | |
263 | if (atomic_dec_and_lock(&ds->ds_count, | |
264 | &nfs4_ds_cache_lock)) { | |
265 | list_del_init(&ds->ds_node); | |
266 | spin_unlock(&nfs4_ds_cache_lock); | |
267 | destroy_ds(ds); | |
268 | } | |
269 | } | |
270 | } | |
271 | kfree(dsaddr->stripe_indices); | |
272 | kfree(dsaddr); | |
273 | } | |
274 | ||
c9895cb6 WAA |
275 | /* |
276 | * Create a string with a human readable address and port to avoid | |
277 | * complicated setup around many dprinks. | |
278 | */ | |
279 | static char * | |
14f9a607 | 280 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) |
c9895cb6 | 281 | { |
14f9a607 | 282 | struct nfs4_pnfs_ds_addr *da; |
c9895cb6 | 283 | char *remotestr; |
c9895cb6 | 284 | size_t len; |
14f9a607 | 285 | char *p; |
c9895cb6 | 286 | |
14f9a607 WAA |
287 | len = 3; /* '{', '}' and eol */ |
288 | list_for_each_entry(da, dsaddrs, da_node) { | |
289 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
c9895cb6 WAA |
290 | } |
291 | ||
14f9a607 WAA |
292 | remotestr = kzalloc(len, gfp_flags); |
293 | if (!remotestr) | |
c9895cb6 | 294 | return NULL; |
c9895cb6 | 295 | |
14f9a607 WAA |
296 | p = remotestr; |
297 | *(p++) = '{'; | |
298 | len--; | |
299 | list_for_each_entry(da, dsaddrs, da_node) { | |
300 | size_t ll = strlen(da->da_remotestr); | |
c9895cb6 | 301 | |
14f9a607 WAA |
302 | if (ll > len) |
303 | goto out_err; | |
c9895cb6 | 304 | |
14f9a607 WAA |
305 | memcpy(p, da->da_remotestr, ll); |
306 | p += ll; | |
307 | len -= ll; | |
c9895cb6 | 308 | |
14f9a607 WAA |
309 | if (len < 1) |
310 | goto out_err; | |
311 | (*p++) = ','; | |
312 | len--; | |
313 | } | |
314 | if (len < 2) | |
315 | goto out_err; | |
316 | *(p++) = '}'; | |
317 | *p = '\0'; | |
c9895cb6 | 318 | return remotestr; |
14f9a607 WAA |
319 | out_err: |
320 | kfree(remotestr); | |
321 | return NULL; | |
c9895cb6 WAA |
322 | } |
323 | ||
16b374ca | 324 | static struct nfs4_pnfs_ds * |
14f9a607 | 325 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) |
16b374ca | 326 | { |
c9895cb6 WAA |
327 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; |
328 | char *remotestr; | |
16b374ca | 329 | |
14f9a607 WAA |
330 | if (list_empty(dsaddrs)) { |
331 | dprintk("%s: no addresses defined\n", __func__); | |
332 | goto out; | |
333 | } | |
334 | ||
335 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
16b374ca AA |
336 | if (!ds) |
337 | goto out; | |
338 | ||
c9895cb6 | 339 | /* this is only used for debugging, so it's ok if its NULL */ |
14f9a607 | 340 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); |
c9895cb6 | 341 | |
16b374ca | 342 | spin_lock(&nfs4_ds_cache_lock); |
14f9a607 | 343 | tmp_ds = _data_server_lookup_locked(dsaddrs); |
16b374ca | 344 | if (tmp_ds == NULL) { |
14f9a607 WAA |
345 | INIT_LIST_HEAD(&ds->ds_addrs); |
346 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
c9895cb6 | 347 | ds->ds_remotestr = remotestr; |
16b374ca AA |
348 | atomic_set(&ds->ds_count, 1); |
349 | INIT_LIST_HEAD(&ds->ds_node); | |
350 | ds->ds_clp = NULL; | |
351 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
c9895cb6 WAA |
352 | dprintk("%s add new data server %s\n", __func__, |
353 | ds->ds_remotestr); | |
16b374ca | 354 | } else { |
14f9a607 WAA |
355 | if (!_data_server_match_all_addrs_locked(&tmp_ds->ds_addrs, |
356 | dsaddrs)) { | |
357 | dprintk("%s: multipath address mismatch: %s != %s", | |
358 | __func__, tmp_ds->ds_remotestr, remotestr); | |
359 | } | |
c9895cb6 | 360 | kfree(remotestr); |
16b374ca AA |
361 | kfree(ds); |
362 | atomic_inc(&tmp_ds->ds_count); | |
c9895cb6 WAA |
363 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", |
364 | __func__, tmp_ds->ds_remotestr, | |
16b374ca AA |
365 | atomic_read(&tmp_ds->ds_count)); |
366 | ds = tmp_ds; | |
367 | } | |
368 | spin_unlock(&nfs4_ds_cache_lock); | |
369 | out: | |
370 | return ds; | |
371 | } | |
372 | ||
373 | /* | |
c9895cb6 | 374 | * Currently only supports ipv4, ipv6 and one multi-path address. |
16b374ca | 375 | */ |
14f9a607 WAA |
376 | static struct nfs4_pnfs_ds_addr * |
377 | decode_ds_addr(struct xdr_stream *streamp, gfp_t gfp_flags) | |
16b374ca | 378 | { |
14f9a607 | 379 | struct nfs4_pnfs_ds_addr *da = NULL; |
c9895cb6 | 380 | char *buf, *portstr; |
c9895cb6 WAA |
381 | u32 port; |
382 | int nlen, rlen; | |
16b374ca | 383 | int tmp[2]; |
35124a09 | 384 | __be32 *p; |
c9895cb6 | 385 | char *netid, *match_netid; |
14f9a607 WAA |
386 | size_t len, match_netid_len; |
387 | char *startsep = ""; | |
388 | char *endsep = ""; | |
389 | ||
16b374ca AA |
390 | |
391 | /* r_netid */ | |
35124a09 WAA |
392 | p = xdr_inline_decode(streamp, 4); |
393 | if (unlikely(!p)) | |
394 | goto out_err; | |
16b374ca | 395 | nlen = be32_to_cpup(p++); |
16b374ca | 396 | |
35124a09 WAA |
397 | p = xdr_inline_decode(streamp, nlen); |
398 | if (unlikely(!p)) | |
399 | goto out_err; | |
16b374ca | 400 | |
c9895cb6 WAA |
401 | netid = kmalloc(nlen+1, gfp_flags); |
402 | if (unlikely(!netid)) | |
16b374ca | 403 | goto out_err; |
16b374ca | 404 | |
c9895cb6 WAA |
405 | netid[nlen] = '\0'; |
406 | memcpy(netid, p, nlen); | |
407 | ||
408 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
35124a09 WAA |
409 | p = xdr_inline_decode(streamp, 4); |
410 | if (unlikely(!p)) | |
c9895cb6 | 411 | goto out_free_netid; |
35124a09 WAA |
412 | rlen = be32_to_cpup(p); |
413 | ||
414 | p = xdr_inline_decode(streamp, rlen); | |
415 | if (unlikely(!p)) | |
c9895cb6 | 416 | goto out_free_netid; |
35124a09 | 417 | |
c9895cb6 WAA |
418 | /* port is ".ABC.DEF", 8 chars max */ |
419 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
ad3d2eed | 420 | dprintk("%s: Invalid address, length %d\n", __func__, |
16b374ca | 421 | rlen); |
c9895cb6 | 422 | goto out_free_netid; |
16b374ca | 423 | } |
a75b9df9 | 424 | buf = kmalloc(rlen + 1, gfp_flags); |
b9f81057 SF |
425 | if (!buf) { |
426 | dprintk("%s: Not enough memory\n", __func__); | |
c9895cb6 | 427 | goto out_free_netid; |
b9f81057 | 428 | } |
16b374ca | 429 | buf[rlen] = '\0'; |
35124a09 | 430 | memcpy(buf, p, rlen); |
16b374ca | 431 | |
c9895cb6 WAA |
432 | /* replace port '.' with '-' */ |
433 | portstr = strrchr(buf, '.'); | |
434 | if (!portstr) { | |
435 | dprintk("%s: Failed finding expected dot in port\n", | |
436 | __func__); | |
437 | goto out_free_buf; | |
438 | } | |
439 | *portstr = '-'; | |
440 | ||
441 | /* find '.' between address and port */ | |
442 | portstr = strrchr(buf, '.'); | |
443 | if (!portstr) { | |
444 | dprintk("%s: Failed finding expected dot between address and " | |
445 | "port\n", __func__); | |
446 | goto out_free_buf; | |
16b374ca | 447 | } |
c9895cb6 | 448 | *portstr = '\0'; |
16b374ca | 449 | |
14f9a607 WAA |
450 | da = kzalloc(sizeof(*da), gfp_flags); |
451 | if (unlikely(!da)) | |
c9895cb6 | 452 | goto out_free_buf; |
14f9a607 WAA |
453 | |
454 | INIT_LIST_HEAD(&da->da_node); | |
455 | ||
456 | if (!rpc_pton(buf, portstr-buf, (struct sockaddr *)&da->da_addr, | |
457 | sizeof(da->da_addr))) { | |
458 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
459 | goto out_free_da; | |
16b374ca AA |
460 | } |
461 | ||
c9895cb6 WAA |
462 | portstr++; |
463 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
16b374ca AA |
464 | port = htons((tmp[0] << 8) | (tmp[1])); |
465 | ||
14f9a607 | 466 | switch (da->da_addr.ss_family) { |
c9895cb6 | 467 | case AF_INET: |
14f9a607 WAA |
468 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; |
469 | da->da_addrlen = sizeof(struct sockaddr_in); | |
c9895cb6 WAA |
470 | match_netid = "tcp"; |
471 | match_netid_len = 3; | |
472 | break; | |
473 | ||
474 | case AF_INET6: | |
14f9a607 WAA |
475 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; |
476 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
c9895cb6 WAA |
477 | match_netid = "tcp6"; |
478 | match_netid_len = 4; | |
14f9a607 WAA |
479 | startsep = "["; |
480 | endsep = "]"; | |
c9895cb6 WAA |
481 | break; |
482 | ||
483 | default: | |
484 | dprintk("%s: unsupported address family: %u\n", | |
14f9a607 WAA |
485 | __func__, da->da_addr.ss_family); |
486 | goto out_free_da; | |
c9895cb6 WAA |
487 | } |
488 | ||
489 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
490 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
491 | __func__, netid, match_netid); | |
14f9a607 | 492 | goto out_free_da; |
c9895cb6 WAA |
493 | } |
494 | ||
14f9a607 WAA |
495 | /* save human readable address */ |
496 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
497 | da->da_remotestr = kzalloc(len, gfp_flags); | |
498 | ||
499 | /* NULL is ok, only used for dprintk */ | |
500 | if (da->da_remotestr) | |
501 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
502 | buf, endsep, ntohs(port)); | |
503 | ||
504 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
505 | kfree(buf); | |
506 | kfree(netid); | |
507 | return da; | |
508 | ||
509 | out_free_da: | |
510 | kfree(da); | |
c9895cb6 | 511 | out_free_buf: |
14f9a607 | 512 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); |
16b374ca | 513 | kfree(buf); |
c9895cb6 WAA |
514 | out_free_netid: |
515 | kfree(netid); | |
16b374ca | 516 | out_err: |
14f9a607 | 517 | return NULL; |
16b374ca AA |
518 | } |
519 | ||
520 | /* Decode opaque device data and return the result */ | |
521 | static struct nfs4_file_layout_dsaddr* | |
a75b9df9 | 522 | decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags) |
16b374ca | 523 | { |
35124a09 | 524 | int i; |
16b374ca AA |
525 | u32 cnt, num; |
526 | u8 *indexp; | |
35124a09 WAA |
527 | __be32 *p; |
528 | u8 *stripe_indices; | |
529 | u8 max_stripe_index; | |
530 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; | |
531 | struct xdr_stream stream; | |
f7da7a12 | 532 | struct xdr_buf buf; |
35124a09 | 533 | struct page *scratch; |
14f9a607 WAA |
534 | struct list_head dsaddrs; |
535 | struct nfs4_pnfs_ds_addr *da; | |
35124a09 WAA |
536 | |
537 | /* set up xdr stream */ | |
a75b9df9 | 538 | scratch = alloc_page(gfp_flags); |
35124a09 WAA |
539 | if (!scratch) |
540 | goto out_err; | |
541 | ||
f7da7a12 | 542 | xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen); |
35124a09 | 543 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
16b374ca AA |
544 | |
545 | /* Get the stripe count (number of stripe index) */ | |
35124a09 WAA |
546 | p = xdr_inline_decode(&stream, 4); |
547 | if (unlikely(!p)) | |
548 | goto out_err_free_scratch; | |
549 | ||
550 | cnt = be32_to_cpup(p); | |
16b374ca AA |
551 | dprintk("%s stripe count %d\n", __func__, cnt); |
552 | if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) { | |
553 | printk(KERN_WARNING "%s: stripe count %d greater than " | |
554 | "supported maximum %d\n", __func__, | |
555 | cnt, NFS4_PNFS_MAX_STRIPE_CNT); | |
35124a09 WAA |
556 | goto out_err_free_scratch; |
557 | } | |
558 | ||
559 | /* read stripe indices */ | |
a75b9df9 | 560 | stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags); |
35124a09 WAA |
561 | if (!stripe_indices) |
562 | goto out_err_free_scratch; | |
563 | ||
564 | p = xdr_inline_decode(&stream, cnt << 2); | |
565 | if (unlikely(!p)) | |
566 | goto out_err_free_stripe_indices; | |
567 | ||
568 | indexp = &stripe_indices[0]; | |
569 | max_stripe_index = 0; | |
570 | for (i = 0; i < cnt; i++) { | |
571 | *indexp = be32_to_cpup(p++); | |
572 | max_stripe_index = max(max_stripe_index, *indexp); | |
573 | indexp++; | |
16b374ca AA |
574 | } |
575 | ||
576 | /* Check the multipath list count */ | |
35124a09 WAA |
577 | p = xdr_inline_decode(&stream, 4); |
578 | if (unlikely(!p)) | |
579 | goto out_err_free_stripe_indices; | |
580 | ||
581 | num = be32_to_cpup(p); | |
16b374ca AA |
582 | dprintk("%s ds_num %u\n", __func__, num); |
583 | if (num > NFS4_PNFS_MAX_MULTI_CNT) { | |
584 | printk(KERN_WARNING "%s: multipath count %d greater than " | |
585 | "supported maximum %d\n", __func__, | |
586 | num, NFS4_PNFS_MAX_MULTI_CNT); | |
35124a09 | 587 | goto out_err_free_stripe_indices; |
16b374ca | 588 | } |
35124a09 WAA |
589 | |
590 | /* validate stripe indices are all < num */ | |
591 | if (max_stripe_index >= num) { | |
592 | printk(KERN_WARNING "%s: stripe index %u >= num ds %u\n", | |
593 | __func__, max_stripe_index, num); | |
594 | goto out_err_free_stripe_indices; | |
595 | } | |
596 | ||
16b374ca AA |
597 | dsaddr = kzalloc(sizeof(*dsaddr) + |
598 | (sizeof(struct nfs4_pnfs_ds *) * (num - 1)), | |
a75b9df9 | 599 | gfp_flags); |
16b374ca | 600 | if (!dsaddr) |
35124a09 | 601 | goto out_err_free_stripe_indices; |
16b374ca AA |
602 | |
603 | dsaddr->stripe_count = cnt; | |
35124a09 WAA |
604 | dsaddr->stripe_indices = stripe_indices; |
605 | stripe_indices = NULL; | |
16b374ca | 606 | dsaddr->ds_num = num; |
1775bc34 BH |
607 | nfs4_init_deviceid_node(&dsaddr->id_node, |
608 | NFS_SERVER(ino)->pnfs_curr_ld, | |
609 | NFS_SERVER(ino)->nfs_client, | |
a1eaecbc | 610 | &pdev->dev_id); |
16b374ca | 611 | |
14f9a607 WAA |
612 | INIT_LIST_HEAD(&dsaddrs); |
613 | ||
16b374ca AA |
614 | for (i = 0; i < dsaddr->ds_num; i++) { |
615 | int j; | |
35124a09 WAA |
616 | u32 mp_count; |
617 | ||
618 | p = xdr_inline_decode(&stream, 4); | |
619 | if (unlikely(!p)) | |
620 | goto out_err_free_deviceid; | |
16b374ca | 621 | |
35124a09 | 622 | mp_count = be32_to_cpup(p); /* multipath count */ |
35124a09 | 623 | for (j = 0; j < mp_count; j++) { |
14f9a607 WAA |
624 | da = decode_ds_addr(&stream, gfp_flags); |
625 | if (da) | |
626 | list_add_tail(&da->da_node, &dsaddrs); | |
627 | } | |
628 | if (list_empty(&dsaddrs)) { | |
629 | dprintk("%s: no suitable DS addresses found\n", | |
630 | __func__); | |
631 | goto out_err_free_deviceid; | |
632 | } | |
633 | ||
634 | dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags); | |
635 | if (!dsaddr->ds_list[i]) | |
636 | goto out_err_drain_dsaddrs; | |
637 | ||
638 | /* If DS was already in cache, free ds addrs */ | |
639 | while (!list_empty(&dsaddrs)) { | |
640 | da = list_first_entry(&dsaddrs, | |
641 | struct nfs4_pnfs_ds_addr, | |
642 | da_node); | |
643 | list_del_init(&da->da_node); | |
644 | kfree(da->da_remotestr); | |
645 | kfree(da); | |
16b374ca AA |
646 | } |
647 | } | |
35124a09 WAA |
648 | |
649 | __free_page(scratch); | |
16b374ca AA |
650 | return dsaddr; |
651 | ||
14f9a607 WAA |
652 | out_err_drain_dsaddrs: |
653 | while (!list_empty(&dsaddrs)) { | |
654 | da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr, | |
655 | da_node); | |
656 | list_del_init(&da->da_node); | |
657 | kfree(da->da_remotestr); | |
658 | kfree(da); | |
659 | } | |
35124a09 | 660 | out_err_free_deviceid: |
16b374ca | 661 | nfs4_fl_free_deviceid(dsaddr); |
35124a09 WAA |
662 | /* stripe_indicies was part of dsaddr */ |
663 | goto out_err_free_scratch; | |
664 | out_err_free_stripe_indices: | |
665 | kfree(stripe_indices); | |
666 | out_err_free_scratch: | |
667 | __free_page(scratch); | |
16b374ca AA |
668 | out_err: |
669 | dprintk("%s ERROR: returning NULL\n", __func__); | |
670 | return NULL; | |
671 | } | |
672 | ||
673 | /* | |
ea8eecdd CH |
674 | * Decode the opaque device specified in 'dev' and add it to the cache of |
675 | * available devices. | |
16b374ca | 676 | */ |
ea8eecdd | 677 | static struct nfs4_file_layout_dsaddr * |
a75b9df9 | 678 | decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags) |
16b374ca | 679 | { |
a1eaecbc BH |
680 | struct nfs4_deviceid_node *d; |
681 | struct nfs4_file_layout_dsaddr *n, *new; | |
16b374ca | 682 | |
a75b9df9 | 683 | new = decode_device(inode, dev, gfp_flags); |
ea8eecdd | 684 | if (!new) { |
16b374ca AA |
685 | printk(KERN_WARNING "%s: Could not decode or add device\n", |
686 | __func__); | |
687 | return NULL; | |
688 | } | |
689 | ||
a1eaecbc BH |
690 | d = nfs4_insert_deviceid_node(&new->id_node); |
691 | n = container_of(d, struct nfs4_file_layout_dsaddr, id_node); | |
692 | if (n != new) { | |
ea8eecdd | 693 | nfs4_fl_free_deviceid(new); |
a1eaecbc | 694 | return n; |
ea8eecdd CH |
695 | } |
696 | ||
ea8eecdd | 697 | return new; |
16b374ca AA |
698 | } |
699 | ||
700 | /* | |
701 | * Retrieve the information for dev_id, add it to the list | |
702 | * of available devices, and return it. | |
703 | */ | |
704 | struct nfs4_file_layout_dsaddr * | |
a75b9df9 | 705 | get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags) |
16b374ca AA |
706 | { |
707 | struct pnfs_device *pdev = NULL; | |
708 | u32 max_resp_sz; | |
709 | int max_pages; | |
710 | struct page **pages = NULL; | |
711 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; | |
712 | int rc, i; | |
713 | struct nfs_server *server = NFS_SERVER(inode); | |
714 | ||
715 | /* | |
716 | * Use the session max response size as the basis for setting | |
717 | * GETDEVICEINFO's maxcount | |
718 | */ | |
719 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
720 | max_pages = max_resp_sz >> PAGE_SHIFT; | |
721 | dprintk("%s inode %p max_resp_sz %u max_pages %d\n", | |
722 | __func__, inode, max_resp_sz, max_pages); | |
723 | ||
a75b9df9 | 724 | pdev = kzalloc(sizeof(struct pnfs_device), gfp_flags); |
16b374ca AA |
725 | if (pdev == NULL) |
726 | return NULL; | |
727 | ||
a75b9df9 | 728 | pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags); |
16b374ca AA |
729 | if (pages == NULL) { |
730 | kfree(pdev); | |
731 | return NULL; | |
732 | } | |
733 | for (i = 0; i < max_pages; i++) { | |
a75b9df9 | 734 | pages[i] = alloc_page(gfp_flags); |
16b374ca AA |
735 | if (!pages[i]) |
736 | goto out_free; | |
737 | } | |
738 | ||
16b374ca AA |
739 | memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id)); |
740 | pdev->layout_type = LAYOUT_NFSV4_1_FILES; | |
741 | pdev->pages = pages; | |
742 | pdev->pgbase = 0; | |
743 | pdev->pglen = PAGE_SIZE * max_pages; | |
744 | pdev->mincount = 0; | |
745 | ||
746 | rc = nfs4_proc_getdeviceinfo(server, pdev); | |
747 | dprintk("%s getdevice info returns %d\n", __func__, rc); | |
748 | if (rc) | |
749 | goto out_free; | |
750 | ||
751 | /* | |
752 | * Found new device, need to decode it and then add it to the | |
753 | * list of known devices for this mountpoint. | |
754 | */ | |
a75b9df9 | 755 | dsaddr = decode_and_add_device(inode, pdev, gfp_flags); |
16b374ca | 756 | out_free: |
16b374ca AA |
757 | for (i = 0; i < max_pages; i++) |
758 | __free_page(pages[i]); | |
759 | kfree(pages); | |
760 | kfree(pdev); | |
761 | dprintk("<-- %s dsaddr %p\n", __func__, dsaddr); | |
762 | return dsaddr; | |
763 | } | |
764 | ||
ea8eecdd CH |
765 | void |
766 | nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) | |
16b374ca | 767 | { |
1775bc34 | 768 | nfs4_put_deviceid_node(&dsaddr->id_node); |
16b374ca | 769 | } |
cfe7f412 FI |
770 | |
771 | /* | |
772 | * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit | |
773 | * Then: ((res + fsi) % dsaddr->stripe_count) | |
774 | */ | |
775 | u32 | |
776 | nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset) | |
777 | { | |
778 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
779 | u64 tmp; | |
780 | ||
781 | tmp = offset - flseg->pattern_offset; | |
782 | do_div(tmp, flseg->stripe_unit); | |
783 | tmp += flseg->first_stripe_index; | |
784 | return do_div(tmp, flseg->dsaddr->stripe_count); | |
785 | } | |
786 | ||
787 | u32 | |
788 | nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j) | |
789 | { | |
790 | return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j]; | |
791 | } | |
792 | ||
793 | struct nfs_fh * | |
794 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j) | |
795 | { | |
796 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
797 | u32 i; | |
798 | ||
799 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
800 | if (flseg->num_fh == 1) | |
801 | i = 0; | |
802 | else if (flseg->num_fh == 0) | |
803 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
804 | return NULL; | |
805 | else | |
806 | i = nfs4_fl_calc_ds_index(lseg, j); | |
807 | } else | |
808 | i = j; | |
809 | return flseg->fh_array[i]; | |
810 | } | |
811 | ||
568e8c49 AA |
812 | static void |
813 | filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr, | |
c9895cb6 | 814 | int err, const char *ds_remotestr) |
568e8c49 | 815 | { |
a1eaecbc | 816 | u32 *p = (u32 *)&dsaddr->id_node.deviceid; |
568e8c49 | 817 | |
c9895cb6 | 818 | printk(KERN_ERR "NFS: data server %s connection error %d." |
568e8c49 | 819 | " Deviceid [%x%x%x%x] marked out of use.\n", |
c9895cb6 | 820 | ds_remotestr, err, p[0], p[1], p[2], p[3]); |
568e8c49 | 821 | |
a1eaecbc | 822 | spin_lock(&nfs4_ds_cache_lock); |
568e8c49 | 823 | dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY; |
a1eaecbc | 824 | spin_unlock(&nfs4_ds_cache_lock); |
568e8c49 AA |
825 | } |
826 | ||
cfe7f412 FI |
827 | struct nfs4_pnfs_ds * |
828 | nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx) | |
829 | { | |
830 | struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr; | |
831 | struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx]; | |
832 | ||
833 | if (ds == NULL) { | |
834 | printk(KERN_ERR "%s: No data server for offset index %d\n", | |
835 | __func__, ds_idx); | |
836 | return NULL; | |
837 | } | |
838 | ||
839 | if (!ds->ds_clp) { | |
568e8c49 | 840 | struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode); |
cfe7f412 FI |
841 | int err; |
842 | ||
568e8c49 AA |
843 | if (dsaddr->flags & NFS4_DEVICE_ID_NEG_ENTRY) { |
844 | /* Already tried to connect, don't try again */ | |
845 | dprintk("%s Deviceid marked out of use\n", __func__); | |
846 | return NULL; | |
847 | } | |
848 | err = nfs4_ds_connect(s, ds); | |
cfe7f412 | 849 | if (err) { |
568e8c49 | 850 | filelayout_mark_devid_negative(dsaddr, err, |
c9895cb6 | 851 | ds->ds_remotestr); |
cfe7f412 FI |
852 | return NULL; |
853 | } | |
854 | } | |
855 | return ds; | |
856 | } |