Commit | Line | Data |
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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 | ||
ea8eecdd CH |
39 | /* |
40 | * Device ID RCU cache. A device ID is unique per client ID and layout type. | |
41 | */ | |
42 | #define NFS4_FL_DEVICE_ID_HASH_BITS 5 | |
43 | #define NFS4_FL_DEVICE_ID_HASH_SIZE (1 << NFS4_FL_DEVICE_ID_HASH_BITS) | |
44 | #define NFS4_FL_DEVICE_ID_HASH_MASK (NFS4_FL_DEVICE_ID_HASH_SIZE - 1) | |
45 | ||
46 | static inline u32 | |
47 | nfs4_fl_deviceid_hash(struct nfs4_deviceid *id) | |
48 | { | |
49 | unsigned char *cptr = (unsigned char *)id->data; | |
50 | unsigned int nbytes = NFS4_DEVICEID4_SIZE; | |
51 | u32 x = 0; | |
52 | ||
53 | while (nbytes--) { | |
54 | x *= 37; | |
55 | x += *cptr++; | |
56 | } | |
57 | return x & NFS4_FL_DEVICE_ID_HASH_MASK; | |
58 | } | |
59 | ||
60 | static struct hlist_head filelayout_deviceid_cache[NFS4_FL_DEVICE_ID_HASH_SIZE]; | |
61 | static DEFINE_SPINLOCK(filelayout_deviceid_lock); | |
62 | ||
16b374ca AA |
63 | /* |
64 | * Data server cache | |
65 | * | |
66 | * Data servers can be mapped to different device ids. | |
67 | * nfs4_pnfs_ds reference counting | |
68 | * - set to 1 on allocation | |
69 | * - incremented when a device id maps a data server already in the cache. | |
70 | * - decremented when deviceid is removed from the cache. | |
71 | */ | |
72 | DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
73 | static LIST_HEAD(nfs4_data_server_cache); | |
74 | ||
75 | /* Debug routines */ | |
76 | void | |
77 | print_ds(struct nfs4_pnfs_ds *ds) | |
78 | { | |
79 | if (ds == NULL) { | |
80 | printk("%s NULL device\n", __func__); | |
81 | return; | |
82 | } | |
83 | printk(" ip_addr %x port %hu\n" | |
84 | " ref count %d\n" | |
85 | " client %p\n" | |
86 | " cl_exchange_flags %x\n", | |
87 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port), | |
88 | atomic_read(&ds->ds_count), ds->ds_clp, | |
89 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); | |
90 | } | |
91 | ||
92 | void | |
93 | print_ds_list(struct nfs4_file_layout_dsaddr *dsaddr) | |
94 | { | |
95 | int i; | |
96 | ||
97 | ifdebug(FACILITY) { | |
98 | printk("%s dsaddr->ds_num %d\n", __func__, | |
99 | dsaddr->ds_num); | |
100 | for (i = 0; i < dsaddr->ds_num; i++) | |
101 | print_ds(dsaddr->ds_list[i]); | |
102 | } | |
103 | } | |
104 | ||
105 | void print_deviceid(struct nfs4_deviceid *id) | |
106 | { | |
107 | u32 *p = (u32 *)id; | |
108 | ||
109 | dprintk("%s: device id= [%x%x%x%x]\n", __func__, | |
110 | p[0], p[1], p[2], p[3]); | |
111 | } | |
112 | ||
113 | /* nfs4_ds_cache_lock is held */ | |
114 | static struct nfs4_pnfs_ds * | |
115 | _data_server_lookup_locked(u32 ip_addr, u32 port) | |
116 | { | |
117 | struct nfs4_pnfs_ds *ds; | |
118 | ||
119 | dprintk("_data_server_lookup: ip_addr=%x port=%hu\n", | |
120 | ntohl(ip_addr), ntohs(port)); | |
121 | ||
122 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) { | |
123 | if (ds->ds_ip_addr == ip_addr && | |
124 | ds->ds_port == port) { | |
125 | return ds; | |
126 | } | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
d83217c1 AA |
131 | /* |
132 | * Create an rpc connection to the nfs4_pnfs_ds data server | |
133 | * Currently only support IPv4 | |
134 | */ | |
135 | static int | |
136 | nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) | |
137 | { | |
138 | struct nfs_client *clp; | |
139 | struct sockaddr_in sin; | |
140 | int status = 0; | |
141 | ||
142 | dprintk("--> %s ip:port %x:%hu au_flavor %d\n", __func__, | |
143 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port), | |
144 | mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor); | |
145 | ||
146 | sin.sin_family = AF_INET; | |
147 | sin.sin_addr.s_addr = ds->ds_ip_addr; | |
148 | sin.sin_port = ds->ds_port; | |
149 | ||
150 | clp = nfs4_set_ds_client(mds_srv->nfs_client, (struct sockaddr *)&sin, | |
151 | sizeof(sin), IPPROTO_TCP); | |
152 | if (IS_ERR(clp)) { | |
153 | status = PTR_ERR(clp); | |
154 | goto out; | |
155 | } | |
156 | ||
157 | if ((clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) != 0) { | |
158 | if (!is_ds_client(clp)) { | |
159 | status = -ENODEV; | |
160 | goto out_put; | |
161 | } | |
162 | ds->ds_clp = clp; | |
163 | dprintk("%s [existing] ip=%x, port=%hu\n", __func__, | |
164 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); | |
165 | goto out; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Do not set NFS_CS_CHECK_LEASE_TIME instead set the DS lease to | |
170 | * be equal to the MDS lease. Renewal is scheduled in create_session. | |
171 | */ | |
172 | spin_lock(&mds_srv->nfs_client->cl_lock); | |
173 | clp->cl_lease_time = mds_srv->nfs_client->cl_lease_time; | |
174 | spin_unlock(&mds_srv->nfs_client->cl_lock); | |
175 | clp->cl_last_renewal = jiffies; | |
176 | ||
177 | /* New nfs_client */ | |
178 | status = nfs4_init_ds_session(clp); | |
179 | if (status) | |
180 | goto out_put; | |
181 | ||
182 | ds->ds_clp = clp; | |
183 | dprintk("%s [new] ip=%x, port=%hu\n", __func__, ntohl(ds->ds_ip_addr), | |
184 | ntohs(ds->ds_port)); | |
185 | out: | |
186 | return status; | |
187 | out_put: | |
188 | nfs_put_client(clp); | |
189 | goto out; | |
190 | } | |
191 | ||
16b374ca AA |
192 | static void |
193 | destroy_ds(struct nfs4_pnfs_ds *ds) | |
194 | { | |
195 | dprintk("--> %s\n", __func__); | |
196 | ifdebug(FACILITY) | |
197 | print_ds(ds); | |
198 | ||
199 | if (ds->ds_clp) | |
200 | nfs_put_client(ds->ds_clp); | |
201 | kfree(ds); | |
202 | } | |
203 | ||
204 | static void | |
205 | nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) | |
206 | { | |
207 | struct nfs4_pnfs_ds *ds; | |
208 | int i; | |
209 | ||
ea8eecdd | 210 | print_deviceid(&dsaddr->deviceid); |
16b374ca AA |
211 | |
212 | for (i = 0; i < dsaddr->ds_num; i++) { | |
213 | ds = dsaddr->ds_list[i]; | |
214 | if (ds != NULL) { | |
215 | if (atomic_dec_and_lock(&ds->ds_count, | |
216 | &nfs4_ds_cache_lock)) { | |
217 | list_del_init(&ds->ds_node); | |
218 | spin_unlock(&nfs4_ds_cache_lock); | |
219 | destroy_ds(ds); | |
220 | } | |
221 | } | |
222 | } | |
223 | kfree(dsaddr->stripe_indices); | |
224 | kfree(dsaddr); | |
225 | } | |
226 | ||
16b374ca AA |
227 | static struct nfs4_pnfs_ds * |
228 | nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port) | |
229 | { | |
230 | struct nfs4_pnfs_ds *tmp_ds, *ds; | |
231 | ||
232 | ds = kzalloc(sizeof(*tmp_ds), GFP_KERNEL); | |
233 | if (!ds) | |
234 | goto out; | |
235 | ||
236 | spin_lock(&nfs4_ds_cache_lock); | |
237 | tmp_ds = _data_server_lookup_locked(ip_addr, port); | |
238 | if (tmp_ds == NULL) { | |
239 | ds->ds_ip_addr = ip_addr; | |
240 | ds->ds_port = port; | |
241 | atomic_set(&ds->ds_count, 1); | |
242 | INIT_LIST_HEAD(&ds->ds_node); | |
243 | ds->ds_clp = NULL; | |
244 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
245 | dprintk("%s add new data server ip 0x%x\n", __func__, | |
246 | ds->ds_ip_addr); | |
247 | } else { | |
248 | kfree(ds); | |
249 | atomic_inc(&tmp_ds->ds_count); | |
250 | dprintk("%s data server found ip 0x%x, inc'ed ds_count to %d\n", | |
251 | __func__, tmp_ds->ds_ip_addr, | |
252 | atomic_read(&tmp_ds->ds_count)); | |
253 | ds = tmp_ds; | |
254 | } | |
255 | spin_unlock(&nfs4_ds_cache_lock); | |
256 | out: | |
257 | return ds; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Currently only support ipv4, and one multi-path address. | |
262 | */ | |
263 | static struct nfs4_pnfs_ds * | |
264 | decode_and_add_ds(__be32 **pp, struct inode *inode) | |
265 | { | |
266 | struct nfs4_pnfs_ds *ds = NULL; | |
267 | char *buf; | |
268 | const char *ipend, *pstr; | |
269 | u32 ip_addr, port; | |
270 | int nlen, rlen, i; | |
271 | int tmp[2]; | |
272 | __be32 *r_netid, *r_addr, *p = *pp; | |
273 | ||
274 | /* r_netid */ | |
275 | nlen = be32_to_cpup(p++); | |
276 | r_netid = p; | |
277 | p += XDR_QUADLEN(nlen); | |
278 | ||
279 | /* r_addr */ | |
280 | rlen = be32_to_cpup(p++); | |
281 | r_addr = p; | |
282 | p += XDR_QUADLEN(rlen); | |
283 | *pp = p; | |
284 | ||
285 | /* Check that netid is "tcp" */ | |
286 | if (nlen != 3 || memcmp((char *)r_netid, "tcp", 3)) { | |
287 | dprintk("%s: ERROR: non ipv4 TCP r_netid\n", __func__); | |
288 | goto out_err; | |
289 | } | |
290 | ||
291 | /* ipv6 length plus port is legal */ | |
292 | if (rlen > INET6_ADDRSTRLEN + 8) { | |
ad3d2eed | 293 | dprintk("%s: Invalid address, length %d\n", __func__, |
16b374ca AA |
294 | rlen); |
295 | goto out_err; | |
296 | } | |
297 | buf = kmalloc(rlen + 1, GFP_KERNEL); | |
b9f81057 SF |
298 | if (!buf) { |
299 | dprintk("%s: Not enough memory\n", __func__); | |
300 | goto out_err; | |
301 | } | |
16b374ca AA |
302 | buf[rlen] = '\0'; |
303 | memcpy(buf, r_addr, rlen); | |
304 | ||
305 | /* replace the port dots with dashes for the in4_pton() delimiter*/ | |
306 | for (i = 0; i < 2; i++) { | |
307 | char *res = strrchr(buf, '.'); | |
ad3d2eed JJ |
308 | if (!res) { |
309 | dprintk("%s: Failed finding expected dots in port\n", | |
310 | __func__); | |
311 | goto out_free; | |
312 | } | |
16b374ca AA |
313 | *res = '-'; |
314 | } | |
315 | ||
316 | /* Currently only support ipv4 address */ | |
317 | if (in4_pton(buf, rlen, (u8 *)&ip_addr, '-', &ipend) == 0) { | |
318 | dprintk("%s: Only ipv4 addresses supported\n", __func__); | |
319 | goto out_free; | |
320 | } | |
321 | ||
322 | /* port */ | |
323 | pstr = ipend; | |
324 | sscanf(pstr, "-%d-%d", &tmp[0], &tmp[1]); | |
325 | port = htons((tmp[0] << 8) | (tmp[1])); | |
326 | ||
327 | ds = nfs4_pnfs_ds_add(inode, ip_addr, port); | |
ad3d2eed | 328 | dprintk("%s: Decoded address and port %s\n", __func__, buf); |
16b374ca AA |
329 | out_free: |
330 | kfree(buf); | |
331 | out_err: | |
332 | return ds; | |
333 | } | |
334 | ||
335 | /* Decode opaque device data and return the result */ | |
336 | static struct nfs4_file_layout_dsaddr* | |
337 | decode_device(struct inode *ino, struct pnfs_device *pdev) | |
338 | { | |
339 | int i, dummy; | |
340 | u32 cnt, num; | |
341 | u8 *indexp; | |
342 | __be32 *p = (__be32 *)pdev->area, *indicesp; | |
343 | struct nfs4_file_layout_dsaddr *dsaddr; | |
344 | ||
345 | /* Get the stripe count (number of stripe index) */ | |
346 | cnt = be32_to_cpup(p++); | |
347 | dprintk("%s stripe count %d\n", __func__, cnt); | |
348 | if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) { | |
349 | printk(KERN_WARNING "%s: stripe count %d greater than " | |
350 | "supported maximum %d\n", __func__, | |
351 | cnt, NFS4_PNFS_MAX_STRIPE_CNT); | |
352 | goto out_err; | |
353 | } | |
354 | ||
355 | /* Check the multipath list count */ | |
356 | indicesp = p; | |
357 | p += XDR_QUADLEN(cnt << 2); | |
358 | num = be32_to_cpup(p++); | |
359 | dprintk("%s ds_num %u\n", __func__, num); | |
360 | if (num > NFS4_PNFS_MAX_MULTI_CNT) { | |
361 | printk(KERN_WARNING "%s: multipath count %d greater than " | |
362 | "supported maximum %d\n", __func__, | |
363 | num, NFS4_PNFS_MAX_MULTI_CNT); | |
364 | goto out_err; | |
365 | } | |
366 | dsaddr = kzalloc(sizeof(*dsaddr) + | |
367 | (sizeof(struct nfs4_pnfs_ds *) * (num - 1)), | |
368 | GFP_KERNEL); | |
369 | if (!dsaddr) | |
370 | goto out_err; | |
371 | ||
372 | dsaddr->stripe_indices = kzalloc(sizeof(u8) * cnt, GFP_KERNEL); | |
373 | if (!dsaddr->stripe_indices) | |
374 | goto out_err_free; | |
375 | ||
376 | dsaddr->stripe_count = cnt; | |
377 | dsaddr->ds_num = num; | |
378 | ||
ea8eecdd | 379 | memcpy(&dsaddr->deviceid, &pdev->dev_id, sizeof(pdev->dev_id)); |
16b374ca AA |
380 | |
381 | /* Go back an read stripe indices */ | |
382 | p = indicesp; | |
383 | indexp = &dsaddr->stripe_indices[0]; | |
384 | for (i = 0; i < dsaddr->stripe_count; i++) { | |
385 | *indexp = be32_to_cpup(p++); | |
386 | if (*indexp >= num) | |
387 | goto out_err_free; | |
388 | indexp++; | |
389 | } | |
390 | /* Skip already read multipath list count */ | |
391 | p++; | |
392 | ||
393 | for (i = 0; i < dsaddr->ds_num; i++) { | |
394 | int j; | |
395 | ||
396 | dummy = be32_to_cpup(p++); /* multipath count */ | |
397 | if (dummy > 1) { | |
398 | printk(KERN_WARNING | |
399 | "%s: Multipath count %d not supported, " | |
400 | "skipping all greater than 1\n", __func__, | |
401 | dummy); | |
402 | } | |
403 | for (j = 0; j < dummy; j++) { | |
404 | if (j == 0) { | |
405 | dsaddr->ds_list[i] = decode_and_add_ds(&p, ino); | |
406 | if (dsaddr->ds_list[i] == NULL) | |
407 | goto out_err_free; | |
408 | } else { | |
409 | u32 len; | |
410 | /* skip extra multipath */ | |
411 | len = be32_to_cpup(p++); | |
412 | p += XDR_QUADLEN(len); | |
413 | len = be32_to_cpup(p++); | |
414 | p += XDR_QUADLEN(len); | |
415 | continue; | |
416 | } | |
417 | } | |
418 | } | |
419 | return dsaddr; | |
420 | ||
421 | out_err_free: | |
422 | nfs4_fl_free_deviceid(dsaddr); | |
423 | out_err: | |
424 | dprintk("%s ERROR: returning NULL\n", __func__); | |
425 | return NULL; | |
426 | } | |
427 | ||
428 | /* | |
ea8eecdd CH |
429 | * Decode the opaque device specified in 'dev' and add it to the cache of |
430 | * available devices. | |
16b374ca | 431 | */ |
ea8eecdd | 432 | static struct nfs4_file_layout_dsaddr * |
16b374ca AA |
433 | decode_and_add_device(struct inode *inode, struct pnfs_device *dev) |
434 | { | |
ea8eecdd CH |
435 | struct nfs4_file_layout_dsaddr *d, *new; |
436 | long hash; | |
16b374ca | 437 | |
ea8eecdd CH |
438 | new = decode_device(inode, dev); |
439 | if (!new) { | |
16b374ca AA |
440 | printk(KERN_WARNING "%s: Could not decode or add device\n", |
441 | __func__); | |
442 | return NULL; | |
443 | } | |
444 | ||
ea8eecdd CH |
445 | spin_lock(&filelayout_deviceid_lock); |
446 | d = nfs4_fl_find_get_deviceid(&new->deviceid); | |
447 | if (d) { | |
448 | spin_unlock(&filelayout_deviceid_lock); | |
449 | nfs4_fl_free_deviceid(new); | |
450 | return d; | |
451 | } | |
452 | ||
453 | INIT_HLIST_NODE(&new->node); | |
454 | atomic_set(&new->ref, 1); | |
455 | hash = nfs4_fl_deviceid_hash(&new->deviceid); | |
456 | hlist_add_head_rcu(&new->node, &filelayout_deviceid_cache[hash]); | |
457 | spin_unlock(&filelayout_deviceid_lock); | |
16b374ca | 458 | |
ea8eecdd | 459 | return new; |
16b374ca AA |
460 | } |
461 | ||
462 | /* | |
463 | * Retrieve the information for dev_id, add it to the list | |
464 | * of available devices, and return it. | |
465 | */ | |
466 | struct nfs4_file_layout_dsaddr * | |
467 | get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id) | |
468 | { | |
469 | struct pnfs_device *pdev = NULL; | |
470 | u32 max_resp_sz; | |
471 | int max_pages; | |
472 | struct page **pages = NULL; | |
473 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; | |
474 | int rc, i; | |
475 | struct nfs_server *server = NFS_SERVER(inode); | |
476 | ||
477 | /* | |
478 | * Use the session max response size as the basis for setting | |
479 | * GETDEVICEINFO's maxcount | |
480 | */ | |
481 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; | |
482 | max_pages = max_resp_sz >> PAGE_SHIFT; | |
483 | dprintk("%s inode %p max_resp_sz %u max_pages %d\n", | |
484 | __func__, inode, max_resp_sz, max_pages); | |
485 | ||
486 | pdev = kzalloc(sizeof(struct pnfs_device), GFP_KERNEL); | |
487 | if (pdev == NULL) | |
488 | return NULL; | |
489 | ||
490 | pages = kzalloc(max_pages * sizeof(struct page *), GFP_KERNEL); | |
491 | if (pages == NULL) { | |
492 | kfree(pdev); | |
493 | return NULL; | |
494 | } | |
495 | for (i = 0; i < max_pages; i++) { | |
496 | pages[i] = alloc_page(GFP_KERNEL); | |
497 | if (!pages[i]) | |
498 | goto out_free; | |
499 | } | |
500 | ||
501 | /* set pdev->area */ | |
502 | pdev->area = vmap(pages, max_pages, VM_MAP, PAGE_KERNEL); | |
503 | if (!pdev->area) | |
504 | goto out_free; | |
505 | ||
506 | memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id)); | |
507 | pdev->layout_type = LAYOUT_NFSV4_1_FILES; | |
508 | pdev->pages = pages; | |
509 | pdev->pgbase = 0; | |
510 | pdev->pglen = PAGE_SIZE * max_pages; | |
511 | pdev->mincount = 0; | |
512 | ||
513 | rc = nfs4_proc_getdeviceinfo(server, pdev); | |
514 | dprintk("%s getdevice info returns %d\n", __func__, rc); | |
515 | if (rc) | |
516 | goto out_free; | |
517 | ||
518 | /* | |
519 | * Found new device, need to decode it and then add it to the | |
520 | * list of known devices for this mountpoint. | |
521 | */ | |
522 | dsaddr = decode_and_add_device(inode, pdev); | |
523 | out_free: | |
524 | if (pdev->area != NULL) | |
525 | vunmap(pdev->area); | |
526 | for (i = 0; i < max_pages; i++) | |
527 | __free_page(pages[i]); | |
528 | kfree(pages); | |
529 | kfree(pdev); | |
530 | dprintk("<-- %s dsaddr %p\n", __func__, dsaddr); | |
531 | return dsaddr; | |
532 | } | |
533 | ||
ea8eecdd CH |
534 | void |
535 | nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) | |
16b374ca | 536 | { |
ea8eecdd CH |
537 | if (atomic_dec_and_lock(&dsaddr->ref, &filelayout_deviceid_lock)) { |
538 | hlist_del_rcu(&dsaddr->node); | |
539 | spin_unlock(&filelayout_deviceid_lock); | |
540 | ||
541 | synchronize_rcu(); | |
542 | nfs4_fl_free_deviceid(dsaddr); | |
543 | } | |
544 | } | |
16b374ca | 545 | |
ea8eecdd CH |
546 | struct nfs4_file_layout_dsaddr * |
547 | nfs4_fl_find_get_deviceid(struct nfs4_deviceid *id) | |
548 | { | |
549 | struct nfs4_file_layout_dsaddr *d; | |
550 | struct hlist_node *n; | |
551 | long hash = nfs4_fl_deviceid_hash(id); | |
552 | ||
553 | ||
554 | rcu_read_lock(); | |
555 | hlist_for_each_entry_rcu(d, n, &filelayout_deviceid_cache[hash], node) { | |
556 | if (!memcmp(&d->deviceid, id, sizeof(*id))) { | |
557 | if (!atomic_inc_not_zero(&d->ref)) | |
558 | goto fail; | |
559 | rcu_read_unlock(); | |
560 | return d; | |
561 | } | |
562 | } | |
563 | fail: | |
564 | rcu_read_unlock(); | |
565 | return NULL; | |
16b374ca | 566 | } |
cfe7f412 FI |
567 | |
568 | /* | |
569 | * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit | |
570 | * Then: ((res + fsi) % dsaddr->stripe_count) | |
571 | */ | |
572 | u32 | |
573 | nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset) | |
574 | { | |
575 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
576 | u64 tmp; | |
577 | ||
578 | tmp = offset - flseg->pattern_offset; | |
579 | do_div(tmp, flseg->stripe_unit); | |
580 | tmp += flseg->first_stripe_index; | |
581 | return do_div(tmp, flseg->dsaddr->stripe_count); | |
582 | } | |
583 | ||
584 | u32 | |
585 | nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j) | |
586 | { | |
587 | return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j]; | |
588 | } | |
589 | ||
590 | struct nfs_fh * | |
591 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j) | |
592 | { | |
593 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
594 | u32 i; | |
595 | ||
596 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
597 | if (flseg->num_fh == 1) | |
598 | i = 0; | |
599 | else if (flseg->num_fh == 0) | |
600 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
601 | return NULL; | |
602 | else | |
603 | i = nfs4_fl_calc_ds_index(lseg, j); | |
604 | } else | |
605 | i = j; | |
606 | return flseg->fh_array[i]; | |
607 | } | |
608 | ||
568e8c49 AA |
609 | static void |
610 | filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr, | |
611 | int err, u32 ds_addr) | |
612 | { | |
613 | u32 *p = (u32 *)&dsaddr->deviceid; | |
614 | ||
615 | printk(KERN_ERR "NFS: data server %x connection error %d." | |
616 | " Deviceid [%x%x%x%x] marked out of use.\n", | |
617 | ds_addr, err, p[0], p[1], p[2], p[3]); | |
618 | ||
619 | spin_lock(&filelayout_deviceid_lock); | |
620 | dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY; | |
621 | spin_unlock(&filelayout_deviceid_lock); | |
622 | } | |
623 | ||
cfe7f412 FI |
624 | struct nfs4_pnfs_ds * |
625 | nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx) | |
626 | { | |
627 | struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr; | |
628 | struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx]; | |
629 | ||
630 | if (ds == NULL) { | |
631 | printk(KERN_ERR "%s: No data server for offset index %d\n", | |
632 | __func__, ds_idx); | |
633 | return NULL; | |
634 | } | |
635 | ||
636 | if (!ds->ds_clp) { | |
568e8c49 | 637 | struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode); |
cfe7f412 FI |
638 | int err; |
639 | ||
568e8c49 AA |
640 | if (dsaddr->flags & NFS4_DEVICE_ID_NEG_ENTRY) { |
641 | /* Already tried to connect, don't try again */ | |
642 | dprintk("%s Deviceid marked out of use\n", __func__); | |
643 | return NULL; | |
644 | } | |
645 | err = nfs4_ds_connect(s, ds); | |
cfe7f412 | 646 | if (err) { |
568e8c49 AA |
647 | filelayout_mark_devid_negative(dsaddr, err, |
648 | ntohl(ds->ds_ip_addr)); | |
cfe7f412 FI |
649 | return NULL; |
650 | } | |
651 | } | |
652 | return ds; | |
653 | } |