blob: 51fe64ace55a34523f9f3d6fd461962e364c1b4e [file] [log] [blame]
Andy Adamson16b374c2010-10-20 00:18:04 -04001/*
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 */
48DEFINE_SPINLOCK(nfs4_ds_cache_lock);
49static LIST_HEAD(nfs4_data_server_cache);
50
51/* Debug routines */
52void
53print_ds(struct nfs4_pnfs_ds *ds)
54{
55 if (ds == NULL) {
56 printk("%s NULL device\n", __func__);
57 return;
58 }
59 printk(" ip_addr %x port %hu\n"
60 " ref count %d\n"
61 " client %p\n"
62 " cl_exchange_flags %x\n",
63 ntohl(ds->ds_ip_addr), ntohs(ds->ds_port),
64 atomic_read(&ds->ds_count), ds->ds_clp,
65 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
66}
67
68void
69print_ds_list(struct nfs4_file_layout_dsaddr *dsaddr)
70{
71 int i;
72
73 ifdebug(FACILITY) {
74 printk("%s dsaddr->ds_num %d\n", __func__,
75 dsaddr->ds_num);
76 for (i = 0; i < dsaddr->ds_num; i++)
77 print_ds(dsaddr->ds_list[i]);
78 }
79}
80
81void print_deviceid(struct nfs4_deviceid *id)
82{
83 u32 *p = (u32 *)id;
84
85 dprintk("%s: device id= [%x%x%x%x]\n", __func__,
86 p[0], p[1], p[2], p[3]);
87}
88
89/* nfs4_ds_cache_lock is held */
90static struct nfs4_pnfs_ds *
91_data_server_lookup_locked(u32 ip_addr, u32 port)
92{
93 struct nfs4_pnfs_ds *ds;
94
95 dprintk("_data_server_lookup: ip_addr=%x port=%hu\n",
96 ntohl(ip_addr), ntohs(port));
97
98 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) {
99 if (ds->ds_ip_addr == ip_addr &&
100 ds->ds_port == port) {
101 return ds;
102 }
103 }
104 return NULL;
105}
106
107static void
108destroy_ds(struct nfs4_pnfs_ds *ds)
109{
110 dprintk("--> %s\n", __func__);
111 ifdebug(FACILITY)
112 print_ds(ds);
113
114 if (ds->ds_clp)
115 nfs_put_client(ds->ds_clp);
116 kfree(ds);
117}
118
119static void
120nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
121{
122 struct nfs4_pnfs_ds *ds;
123 int i;
124
125 print_deviceid(&dsaddr->deviceid.de_id);
126
127 for (i = 0; i < dsaddr->ds_num; i++) {
128 ds = dsaddr->ds_list[i];
129 if (ds != NULL) {
130 if (atomic_dec_and_lock(&ds->ds_count,
131 &nfs4_ds_cache_lock)) {
132 list_del_init(&ds->ds_node);
133 spin_unlock(&nfs4_ds_cache_lock);
134 destroy_ds(ds);
135 }
136 }
137 }
138 kfree(dsaddr->stripe_indices);
139 kfree(dsaddr);
140}
141
142void
143nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *device)
144{
145 struct nfs4_file_layout_dsaddr *dsaddr =
146 container_of(device, struct nfs4_file_layout_dsaddr, deviceid);
147
148 nfs4_fl_free_deviceid(dsaddr);
149}
150
151static struct nfs4_pnfs_ds *
152nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port)
153{
154 struct nfs4_pnfs_ds *tmp_ds, *ds;
155
156 ds = kzalloc(sizeof(*tmp_ds), GFP_KERNEL);
157 if (!ds)
158 goto out;
159
160 spin_lock(&nfs4_ds_cache_lock);
161 tmp_ds = _data_server_lookup_locked(ip_addr, port);
162 if (tmp_ds == NULL) {
163 ds->ds_ip_addr = ip_addr;
164 ds->ds_port = port;
165 atomic_set(&ds->ds_count, 1);
166 INIT_LIST_HEAD(&ds->ds_node);
167 ds->ds_clp = NULL;
168 list_add(&ds->ds_node, &nfs4_data_server_cache);
169 dprintk("%s add new data server ip 0x%x\n", __func__,
170 ds->ds_ip_addr);
171 } else {
172 kfree(ds);
173 atomic_inc(&tmp_ds->ds_count);
174 dprintk("%s data server found ip 0x%x, inc'ed ds_count to %d\n",
175 __func__, tmp_ds->ds_ip_addr,
176 atomic_read(&tmp_ds->ds_count));
177 ds = tmp_ds;
178 }
179 spin_unlock(&nfs4_ds_cache_lock);
180out:
181 return ds;
182}
183
184/*
185 * Currently only support ipv4, and one multi-path address.
186 */
187static struct nfs4_pnfs_ds *
188decode_and_add_ds(__be32 **pp, struct inode *inode)
189{
190 struct nfs4_pnfs_ds *ds = NULL;
191 char *buf;
192 const char *ipend, *pstr;
193 u32 ip_addr, port;
194 int nlen, rlen, i;
195 int tmp[2];
196 __be32 *r_netid, *r_addr, *p = *pp;
197
198 /* r_netid */
199 nlen = be32_to_cpup(p++);
200 r_netid = p;
201 p += XDR_QUADLEN(nlen);
202
203 /* r_addr */
204 rlen = be32_to_cpup(p++);
205 r_addr = p;
206 p += XDR_QUADLEN(rlen);
207 *pp = p;
208
209 /* Check that netid is "tcp" */
210 if (nlen != 3 || memcmp((char *)r_netid, "tcp", 3)) {
211 dprintk("%s: ERROR: non ipv4 TCP r_netid\n", __func__);
212 goto out_err;
213 }
214
215 /* ipv6 length plus port is legal */
216 if (rlen > INET6_ADDRSTRLEN + 8) {
217 dprintk("%s Invalid address, length %d\n", __func__,
218 rlen);
219 goto out_err;
220 }
221 buf = kmalloc(rlen + 1, GFP_KERNEL);
222 buf[rlen] = '\0';
223 memcpy(buf, r_addr, rlen);
224
225 /* replace the port dots with dashes for the in4_pton() delimiter*/
226 for (i = 0; i < 2; i++) {
227 char *res = strrchr(buf, '.');
228 *res = '-';
229 }
230
231 /* Currently only support ipv4 address */
232 if (in4_pton(buf, rlen, (u8 *)&ip_addr, '-', &ipend) == 0) {
233 dprintk("%s: Only ipv4 addresses supported\n", __func__);
234 goto out_free;
235 }
236
237 /* port */
238 pstr = ipend;
239 sscanf(pstr, "-%d-%d", &tmp[0], &tmp[1]);
240 port = htons((tmp[0] << 8) | (tmp[1]));
241
242 ds = nfs4_pnfs_ds_add(inode, ip_addr, port);
243 dprintk("%s Decoded address and port %s\n", __func__, buf);
244out_free:
245 kfree(buf);
246out_err:
247 return ds;
248}
249
250/* Decode opaque device data and return the result */
251static struct nfs4_file_layout_dsaddr*
252decode_device(struct inode *ino, struct pnfs_device *pdev)
253{
254 int i, dummy;
255 u32 cnt, num;
256 u8 *indexp;
257 __be32 *p = (__be32 *)pdev->area, *indicesp;
258 struct nfs4_file_layout_dsaddr *dsaddr;
259
260 /* Get the stripe count (number of stripe index) */
261 cnt = be32_to_cpup(p++);
262 dprintk("%s stripe count %d\n", __func__, cnt);
263 if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
264 printk(KERN_WARNING "%s: stripe count %d greater than "
265 "supported maximum %d\n", __func__,
266 cnt, NFS4_PNFS_MAX_STRIPE_CNT);
267 goto out_err;
268 }
269
270 /* Check the multipath list count */
271 indicesp = p;
272 p += XDR_QUADLEN(cnt << 2);
273 num = be32_to_cpup(p++);
274 dprintk("%s ds_num %u\n", __func__, num);
275 if (num > NFS4_PNFS_MAX_MULTI_CNT) {
276 printk(KERN_WARNING "%s: multipath count %d greater than "
277 "supported maximum %d\n", __func__,
278 num, NFS4_PNFS_MAX_MULTI_CNT);
279 goto out_err;
280 }
281 dsaddr = kzalloc(sizeof(*dsaddr) +
282 (sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
283 GFP_KERNEL);
284 if (!dsaddr)
285 goto out_err;
286
287 dsaddr->stripe_indices = kzalloc(sizeof(u8) * cnt, GFP_KERNEL);
288 if (!dsaddr->stripe_indices)
289 goto out_err_free;
290
291 dsaddr->stripe_count = cnt;
292 dsaddr->ds_num = num;
293
294 memcpy(&dsaddr->deviceid.de_id, &pdev->dev_id, sizeof(pdev->dev_id));
295
296 /* Go back an read stripe indices */
297 p = indicesp;
298 indexp = &dsaddr->stripe_indices[0];
299 for (i = 0; i < dsaddr->stripe_count; i++) {
300 *indexp = be32_to_cpup(p++);
301 if (*indexp >= num)
302 goto out_err_free;
303 indexp++;
304 }
305 /* Skip already read multipath list count */
306 p++;
307
308 for (i = 0; i < dsaddr->ds_num; i++) {
309 int j;
310
311 dummy = be32_to_cpup(p++); /* multipath count */
312 if (dummy > 1) {
313 printk(KERN_WARNING
314 "%s: Multipath count %d not supported, "
315 "skipping all greater than 1\n", __func__,
316 dummy);
317 }
318 for (j = 0; j < dummy; j++) {
319 if (j == 0) {
320 dsaddr->ds_list[i] = decode_and_add_ds(&p, ino);
321 if (dsaddr->ds_list[i] == NULL)
322 goto out_err_free;
323 } else {
324 u32 len;
325 /* skip extra multipath */
326 len = be32_to_cpup(p++);
327 p += XDR_QUADLEN(len);
328 len = be32_to_cpup(p++);
329 p += XDR_QUADLEN(len);
330 continue;
331 }
332 }
333 }
334 return dsaddr;
335
336out_err_free:
337 nfs4_fl_free_deviceid(dsaddr);
338out_err:
339 dprintk("%s ERROR: returning NULL\n", __func__);
340 return NULL;
341}
342
343/*
344 * Decode the opaque device specified in 'dev'
345 * and add it to the list of available devices.
346 * If the deviceid is already cached, nfs4_add_deviceid will return
347 * a pointer to the cached struct and throw away the new.
348 */
349static struct nfs4_file_layout_dsaddr*
350decode_and_add_device(struct inode *inode, struct pnfs_device *dev)
351{
352 struct nfs4_file_layout_dsaddr *dsaddr;
353 struct pnfs_deviceid_node *d;
354
355 dsaddr = decode_device(inode, dev);
356 if (!dsaddr) {
357 printk(KERN_WARNING "%s: Could not decode or add device\n",
358 __func__);
359 return NULL;
360 }
361
362 d = pnfs_add_deviceid(NFS_SERVER(inode)->nfs_client->cl_devid_cache,
363 &dsaddr->deviceid);
364
365 return container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
366}
367
368/*
369 * Retrieve the information for dev_id, add it to the list
370 * of available devices, and return it.
371 */
372struct nfs4_file_layout_dsaddr *
373get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id)
374{
375 struct pnfs_device *pdev = NULL;
376 u32 max_resp_sz;
377 int max_pages;
378 struct page **pages = NULL;
379 struct nfs4_file_layout_dsaddr *dsaddr = NULL;
380 int rc, i;
381 struct nfs_server *server = NFS_SERVER(inode);
382
383 /*
384 * Use the session max response size as the basis for setting
385 * GETDEVICEINFO's maxcount
386 */
387 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
388 max_pages = max_resp_sz >> PAGE_SHIFT;
389 dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
390 __func__, inode, max_resp_sz, max_pages);
391
392 pdev = kzalloc(sizeof(struct pnfs_device), GFP_KERNEL);
393 if (pdev == NULL)
394 return NULL;
395
396 pages = kzalloc(max_pages * sizeof(struct page *), GFP_KERNEL);
397 if (pages == NULL) {
398 kfree(pdev);
399 return NULL;
400 }
401 for (i = 0; i < max_pages; i++) {
402 pages[i] = alloc_page(GFP_KERNEL);
403 if (!pages[i])
404 goto out_free;
405 }
406
407 /* set pdev->area */
408 pdev->area = vmap(pages, max_pages, VM_MAP, PAGE_KERNEL);
409 if (!pdev->area)
410 goto out_free;
411
412 memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
413 pdev->layout_type = LAYOUT_NFSV4_1_FILES;
414 pdev->pages = pages;
415 pdev->pgbase = 0;
416 pdev->pglen = PAGE_SIZE * max_pages;
417 pdev->mincount = 0;
418
419 rc = nfs4_proc_getdeviceinfo(server, pdev);
420 dprintk("%s getdevice info returns %d\n", __func__, rc);
421 if (rc)
422 goto out_free;
423
424 /*
425 * Found new device, need to decode it and then add it to the
426 * list of known devices for this mountpoint.
427 */
428 dsaddr = decode_and_add_device(inode, pdev);
429out_free:
430 if (pdev->area != NULL)
431 vunmap(pdev->area);
432 for (i = 0; i < max_pages; i++)
433 __free_page(pages[i]);
434 kfree(pages);
435 kfree(pdev);
436 dprintk("<-- %s dsaddr %p\n", __func__, dsaddr);
437 return dsaddr;
438}
439
440struct nfs4_file_layout_dsaddr *
441nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
442{
443 struct pnfs_deviceid_node *d;
444
445 d = pnfs_find_get_deviceid(clp->cl_devid_cache, id);
446 return (d == NULL) ? NULL :
447 container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
448}