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12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/nfs_fs.h>
17#include <linux/nfs_fs_sb.h>
18#include <linux/in6.h>
19#include <linux/seq_file.h>
20#include <linux/slab.h>
21
22#include "internal.h"
23#include "iostat.h"
24#include "fscache.h"
25
26#define NFSDBG_FACILITY NFSDBG_FSCACHE
27
28static struct rb_root nfs_fscache_keys = RB_ROOT;
29static DEFINE_SPINLOCK(nfs_fscache_keys_lock);
30
31
32
33
34
35
36
37void nfs_fscache_get_client_cookie(struct nfs_client *clp)
38{
39
40 clp->fscache = fscache_acquire_cookie(nfs_fscache_netfs.primary_index,
41 &nfs_fscache_server_index_def,
42 clp);
43 dfprintk(FSCACHE, "NFS: get client cookie (0x%p/0x%p)\n",
44 clp, clp->fscache);
45}
46
47
48
49
50void nfs_fscache_release_client_cookie(struct nfs_client *clp)
51{
52 dfprintk(FSCACHE, "NFS: releasing client cookie (0x%p/0x%p)\n",
53 clp, clp->fscache);
54
55 fscache_relinquish_cookie(clp->fscache, 0);
56 clp->fscache = NULL;
57}
58
59
60
61
62
63
64
65
66
67void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int ulen)
68{
69 struct nfs_fscache_key *key, *xkey;
70 struct nfs_server *nfss = NFS_SB(sb);
71 struct rb_node **p, *parent;
72 int diff;
73
74 if (!uniq) {
75 uniq = "";
76 ulen = 1;
77 }
78
79 key = kzalloc(sizeof(*key) + ulen, GFP_KERNEL);
80 if (!key)
81 return;
82
83 key->nfs_client = nfss->nfs_client;
84 key->key.super.s_flags = sb->s_flags & NFS_MS_MASK;
85 key->key.nfs_server.flags = nfss->flags;
86 key->key.nfs_server.rsize = nfss->rsize;
87 key->key.nfs_server.wsize = nfss->wsize;
88 key->key.nfs_server.acregmin = nfss->acregmin;
89 key->key.nfs_server.acregmax = nfss->acregmax;
90 key->key.nfs_server.acdirmin = nfss->acdirmin;
91 key->key.nfs_server.acdirmax = nfss->acdirmax;
92 key->key.nfs_server.fsid = nfss->fsid;
93 key->key.rpc_auth.au_flavor = nfss->client->cl_auth->au_flavor;
94
95 key->key.uniq_len = ulen;
96 memcpy(key->key.uniquifier, uniq, ulen);
97
98 spin_lock(&nfs_fscache_keys_lock);
99 p = &nfs_fscache_keys.rb_node;
100 parent = NULL;
101 while (*p) {
102 parent = *p;
103 xkey = rb_entry(parent, struct nfs_fscache_key, node);
104
105 if (key->nfs_client < xkey->nfs_client)
106 goto go_left;
107 if (key->nfs_client > xkey->nfs_client)
108 goto go_right;
109
110 diff = memcmp(&key->key, &xkey->key, sizeof(key->key));
111 if (diff < 0)
112 goto go_left;
113 if (diff > 0)
114 goto go_right;
115
116 if (key->key.uniq_len == 0)
117 goto non_unique;
118 diff = memcmp(key->key.uniquifier,
119 xkey->key.uniquifier,
120 key->key.uniq_len);
121 if (diff < 0)
122 goto go_left;
123 if (diff > 0)
124 goto go_right;
125 goto non_unique;
126
127 go_left:
128 p = &(*p)->rb_left;
129 continue;
130 go_right:
131 p = &(*p)->rb_right;
132 }
133
134 rb_link_node(&key->node, parent, p);
135 rb_insert_color(&key->node, &nfs_fscache_keys);
136 spin_unlock(&nfs_fscache_keys_lock);
137 nfss->fscache_key = key;
138
139
140 nfss->fscache = fscache_acquire_cookie(nfss->nfs_client->fscache,
141 &nfs_fscache_super_index_def,
142 nfss);
143 dfprintk(FSCACHE, "NFS: get superblock cookie (0x%p/0x%p)\n",
144 nfss, nfss->fscache);
145 return;
146
147non_unique:
148 spin_unlock(&nfs_fscache_keys_lock);
149 kfree(key);
150 nfss->fscache_key = NULL;
151 nfss->fscache = NULL;
152 printk(KERN_WARNING "NFS:"
153 " Cache request denied due to non-unique superblock keys\n");
154}
155
156
157
158
159void nfs_fscache_release_super_cookie(struct super_block *sb)
160{
161 struct nfs_server *nfss = NFS_SB(sb);
162
163 dfprintk(FSCACHE, "NFS: releasing superblock cookie (0x%p/0x%p)\n",
164 nfss, nfss->fscache);
165
166 fscache_relinquish_cookie(nfss->fscache, 0);
167 nfss->fscache = NULL;
168
169 if (nfss->fscache_key) {
170 spin_lock(&nfs_fscache_keys_lock);
171 rb_erase(&nfss->fscache_key->node, &nfs_fscache_keys);
172 spin_unlock(&nfs_fscache_keys_lock);
173 kfree(nfss->fscache_key);
174 nfss->fscache_key = NULL;
175 }
176}
177
178
179
180
181void nfs_fscache_init_inode_cookie(struct inode *inode)
182{
183 NFS_I(inode)->fscache = NULL;
184 if (S_ISREG(inode->i_mode))
185 set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
186}
187
188
189
190
191static void nfs_fscache_enable_inode_cookie(struct inode *inode)
192{
193 struct super_block *sb = inode->i_sb;
194 struct nfs_inode *nfsi = NFS_I(inode);
195
196 if (nfsi->fscache || !NFS_FSCACHE(inode))
197 return;
198
199 if ((NFS_SB(sb)->options & NFS_OPTION_FSCACHE)) {
200 nfsi->fscache = fscache_acquire_cookie(
201 NFS_SB(sb)->fscache,
202 &nfs_fscache_inode_object_def,
203 nfsi);
204
205 dfprintk(FSCACHE, "NFS: get FH cookie (0x%p/0x%p/0x%p)\n",
206 sb, nfsi, nfsi->fscache);
207 }
208}
209
210
211
212
213void nfs_fscache_release_inode_cookie(struct inode *inode)
214{
215 struct nfs_inode *nfsi = NFS_I(inode);
216
217 dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n",
218 nfsi, nfsi->fscache);
219
220 fscache_relinquish_cookie(nfsi->fscache, 0);
221 nfsi->fscache = NULL;
222}
223
224
225
226
227void nfs_fscache_zap_inode_cookie(struct inode *inode)
228{
229 struct nfs_inode *nfsi = NFS_I(inode);
230
231 dfprintk(FSCACHE, "NFS: zapping cookie (0x%p/0x%p)\n",
232 nfsi, nfsi->fscache);
233
234 fscache_relinquish_cookie(nfsi->fscache, 1);
235 nfsi->fscache = NULL;
236}
237
238
239
240
241
242
243static void nfs_fscache_disable_inode_cookie(struct inode *inode)
244{
245 clear_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
246
247 if (NFS_I(inode)->fscache) {
248 dfprintk(FSCACHE,
249 "NFS: nfsi 0x%p turning cache off\n", NFS_I(inode));
250
251
252
253
254 fscache_uncache_all_inode_pages(NFS_I(inode)->fscache, inode);
255 nfs_fscache_zap_inode_cookie(inode);
256 }
257}
258
259
260
261
262static int nfs_fscache_wait_bit(void *flags)
263{
264 schedule();
265 return 0;
266}
267
268
269
270
271static inline void nfs_fscache_inode_lock(struct inode *inode)
272{
273 struct nfs_inode *nfsi = NFS_I(inode);
274
275 while (test_and_set_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags))
276 wait_on_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK,
277 nfs_fscache_wait_bit, TASK_UNINTERRUPTIBLE);
278}
279
280
281
282
283static inline void nfs_fscache_inode_unlock(struct inode *inode)
284{
285 struct nfs_inode *nfsi = NFS_I(inode);
286
287 smp_mb__before_clear_bit();
288 clear_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags);
289 smp_mb__after_clear_bit();
290 wake_up_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK);
291}
292
293
294
295
296
297
298
299void nfs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
300{
301 if (NFS_FSCACHE(inode)) {
302 nfs_fscache_inode_lock(inode);
303 if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
304 nfs_fscache_disable_inode_cookie(inode);
305 else
306 nfs_fscache_enable_inode_cookie(inode);
307 nfs_fscache_inode_unlock(inode);
308 }
309}
310EXPORT_SYMBOL_GPL(nfs_fscache_set_inode_cookie);
311
312
313
314
315
316void nfs_fscache_reset_inode_cookie(struct inode *inode)
317{
318 struct nfs_inode *nfsi = NFS_I(inode);
319 struct nfs_server *nfss = NFS_SERVER(inode);
320 NFS_IFDEBUG(struct fscache_cookie *old = nfsi->fscache);
321
322 nfs_fscache_inode_lock(inode);
323 if (nfsi->fscache) {
324
325 fscache_relinquish_cookie(nfsi->fscache, 1);
326
327 nfsi->fscache = fscache_acquire_cookie(
328 nfss->nfs_client->fscache,
329 &nfs_fscache_inode_object_def,
330 nfsi);
331
332 dfprintk(FSCACHE,
333 "NFS: revalidation new cookie (0x%p/0x%p/0x%p/0x%p)\n",
334 nfss, nfsi, old, nfsi->fscache);
335 }
336 nfs_fscache_inode_unlock(inode);
337}
338
339
340
341
342
343
344int nfs_fscache_release_page(struct page *page, gfp_t gfp)
345{
346 if (PageFsCache(page)) {
347 struct nfs_inode *nfsi = NFS_I(page->mapping->host);
348 struct fscache_cookie *cookie = nfsi->fscache;
349
350 BUG_ON(!cookie);
351 dfprintk(FSCACHE, "NFS: fscache releasepage (0x%p/0x%p/0x%p)\n",
352 cookie, page, nfsi);
353
354 if (!fscache_maybe_release_page(cookie, page, gfp))
355 return 0;
356
357 nfs_add_fscache_stats(page->mapping->host,
358 NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
359 }
360
361 return 1;
362}
363
364
365
366
367
368void __nfs_fscache_invalidate_page(struct page *page, struct inode *inode)
369{
370 struct nfs_inode *nfsi = NFS_I(inode);
371 struct fscache_cookie *cookie = nfsi->fscache;
372
373 BUG_ON(!cookie);
374
375 dfprintk(FSCACHE, "NFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
376 cookie, page, nfsi);
377
378 fscache_wait_on_page_write(cookie, page);
379
380 BUG_ON(!PageLocked(page));
381 fscache_uncache_page(cookie, page);
382 nfs_add_fscache_stats(page->mapping->host,
383 NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
384}
385
386
387
388
389
390static void nfs_readpage_from_fscache_complete(struct page *page,
391 void *context,
392 int error)
393{
394 dfprintk(FSCACHE,
395 "NFS: readpage_from_fscache_complete (0x%p/0x%p/%d)\n",
396 page, context, error);
397
398
399
400 if (!error) {
401 SetPageUptodate(page);
402 unlock_page(page);
403 } else {
404 error = nfs_readpage_async(context, page->mapping->host, page);
405 if (error)
406 unlock_page(page);
407 }
408}
409
410
411
412
413int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
414 struct inode *inode, struct page *page)
415{
416 int ret;
417
418 dfprintk(FSCACHE,
419 "NFS: readpage_from_fscache(fsc:%p/p:%p(i:%lx f:%lx)/0x%p)\n",
420 NFS_I(inode)->fscache, page, page->index, page->flags, inode);
421
422 ret = fscache_read_or_alloc_page(NFS_I(inode)->fscache,
423 page,
424 nfs_readpage_from_fscache_complete,
425 ctx,
426 GFP_KERNEL);
427
428 switch (ret) {
429 case 0:
430 dfprintk(FSCACHE,
431 "NFS: readpage_from_fscache: BIO submitted\n");
432 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK, 1);
433 return ret;
434
435 case -ENOBUFS:
436 case -ENODATA:
437 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL, 1);
438 dfprintk(FSCACHE,
439 "NFS: readpage_from_fscache %d\n", ret);
440 return 1;
441
442 default:
443 dfprintk(FSCACHE, "NFS: readpage_from_fscache %d\n", ret);
444 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL, 1);
445 }
446 return ret;
447}
448
449
450
451
452int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
453 struct inode *inode,
454 struct address_space *mapping,
455 struct list_head *pages,
456 unsigned *nr_pages)
457{
458 unsigned npages = *nr_pages;
459 int ret;
460
461 dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n",
462 NFS_I(inode)->fscache, npages, inode);
463
464 ret = fscache_read_or_alloc_pages(NFS_I(inode)->fscache,
465 mapping, pages, nr_pages,
466 nfs_readpage_from_fscache_complete,
467 ctx,
468 mapping_gfp_mask(mapping));
469 if (*nr_pages < npages)
470 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK,
471 npages);
472 if (*nr_pages > 0)
473 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL,
474 *nr_pages);
475
476 switch (ret) {
477 case 0:
478 BUG_ON(!list_empty(pages));
479 BUG_ON(*nr_pages != 0);
480 dfprintk(FSCACHE,
481 "NFS: nfs_getpages_from_fscache: submitted\n");
482
483 return ret;
484
485 case -ENOBUFS:
486 case -ENODATA:
487 dfprintk(FSCACHE,
488 "NFS: nfs_getpages_from_fscache: no page: %d\n", ret);
489 return 1;
490
491 default:
492 dfprintk(FSCACHE,
493 "NFS: nfs_getpages_from_fscache: ret %d\n", ret);
494 }
495
496 return ret;
497}
498
499
500
501
502
503void __nfs_readpage_to_fscache(struct inode *inode, struct page *page, int sync)
504{
505 int ret;
506
507 dfprintk(FSCACHE,
508 "NFS: readpage_to_fscache(fsc:%p/p:%p(i:%lx f:%lx)/%d)\n",
509 NFS_I(inode)->fscache, page, page->index, page->flags, sync);
510
511 ret = fscache_write_page(NFS_I(inode)->fscache, page, GFP_KERNEL);
512 dfprintk(FSCACHE,
513 "NFS: readpage_to_fscache: p:%p(i:%lu f:%lx) ret %d\n",
514 page, page->index, page->flags, ret);
515
516 if (ret != 0) {
517 fscache_uncache_page(NFS_I(inode)->fscache, page);
518 nfs_add_fscache_stats(inode,
519 NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL, 1);
520 nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
521 } else {
522 nfs_add_fscache_stats(inode,
523 NFSIOS_FSCACHE_PAGES_WRITTEN_OK, 1);
524 }
525}
526