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Linux/fs/ceph/cache.c

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  1 /*
  2  * Ceph cache definitions.
  3  *
  4  *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
  5  *  Written by Milosz Tanski (milosz@adfin.com)
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License version 2
  9  *  as published by the Free Software Foundation.
 10  *
 11  *  This program is distributed in the hope that it will be useful,
 12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *  GNU General Public License for more details.
 15  *
 16  *  You should have received a copy of the GNU General Public License
 17  *  along with this program; if not, write to:
 18  *  Free Software Foundation
 19  *  51 Franklin Street, Fifth Floor
 20  *  Boston, MA  02111-1301  USA
 21  *
 22  */
 23 
 24 #include "super.h"
 25 #include "cache.h"
 26 
 27 struct ceph_aux_inode {
 28         struct timespec mtime;
 29         loff_t          size;
 30 };
 31 
 32 struct fscache_netfs ceph_cache_netfs = {
 33         .name           = "ceph",
 34         .version        = 0,
 35 };
 36 
 37 static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data,
 38                                              void *buffer, uint16_t maxbuf)
 39 {
 40         const struct ceph_fs_client* fsc = cookie_netfs_data;
 41         uint16_t klen;
 42 
 43         klen = sizeof(fsc->client->fsid);
 44         if (klen > maxbuf)
 45                 return 0;
 46 
 47         memcpy(buffer, &fsc->client->fsid, klen);
 48         return klen;
 49 }
 50 
 51 static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
 52         .name           = "CEPH.fsid",
 53         .type           = FSCACHE_COOKIE_TYPE_INDEX,
 54         .get_key        = ceph_fscache_session_get_key,
 55 };
 56 
 57 int ceph_fscache_register(void)
 58 {
 59         return fscache_register_netfs(&ceph_cache_netfs);
 60 }
 61 
 62 void ceph_fscache_unregister(void)
 63 {
 64         fscache_unregister_netfs(&ceph_cache_netfs);
 65 }
 66 
 67 int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
 68 {
 69         fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
 70                                               &ceph_fscache_fsid_object_def,
 71                                               fsc, true);
 72 
 73         if (fsc->fscache == NULL) {
 74                 pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
 75                 return 0;
 76         }
 77 
 78         fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1);
 79         if (fsc->revalidate_wq == NULL)
 80                 return -ENOMEM;
 81 
 82         return 0;
 83 }
 84 
 85 static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data,
 86                                            void *buffer, uint16_t maxbuf)
 87 {
 88         const struct ceph_inode_info* ci = cookie_netfs_data;
 89         uint16_t klen;
 90 
 91         /* use ceph virtual inode (id + snapshot) */
 92         klen = sizeof(ci->i_vino);
 93         if (klen > maxbuf)
 94                 return 0;
 95 
 96         memcpy(buffer, &ci->i_vino, klen);
 97         return klen;
 98 }
 99 
100 static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data,
101                                            void *buffer, uint16_t bufmax)
102 {
103         struct ceph_aux_inode aux;
104         const struct ceph_inode_info* ci = cookie_netfs_data;
105         const struct inode* inode = &ci->vfs_inode;
106 
107         memset(&aux, 0, sizeof(aux));
108         aux.mtime = inode->i_mtime;
109         aux.size = i_size_read(inode);
110 
111         memcpy(buffer, &aux, sizeof(aux));
112 
113         return sizeof(aux);
114 }
115 
116 static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data,
117                                         uint64_t *size)
118 {
119         const struct ceph_inode_info* ci = cookie_netfs_data;
120         *size = i_size_read(&ci->vfs_inode);
121 }
122 
123 static enum fscache_checkaux ceph_fscache_inode_check_aux(
124         void *cookie_netfs_data, const void *data, uint16_t dlen)
125 {
126         struct ceph_aux_inode aux;
127         struct ceph_inode_info* ci = cookie_netfs_data;
128         struct inode* inode = &ci->vfs_inode;
129 
130         if (dlen != sizeof(aux))
131                 return FSCACHE_CHECKAUX_OBSOLETE;
132 
133         memset(&aux, 0, sizeof(aux));
134         aux.mtime = inode->i_mtime;
135         aux.size = i_size_read(inode);
136 
137         if (memcmp(data, &aux, sizeof(aux)) != 0)
138                 return FSCACHE_CHECKAUX_OBSOLETE;
139 
140         dout("ceph inode 0x%p cached okay", ci);
141         return FSCACHE_CHECKAUX_OKAY;
142 }
143 
144 static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data)
145 {
146         struct ceph_inode_info* ci = cookie_netfs_data;
147         struct pagevec pvec;
148         pgoff_t first;
149         int loop, nr_pages;
150 
151         pagevec_init(&pvec, 0);
152         first = 0;
153 
154         dout("ceph inode 0x%p now uncached", ci);
155 
156         while (1) {
157                 nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first,
158                                           PAGEVEC_SIZE - pagevec_count(&pvec));
159 
160                 if (!nr_pages)
161                         break;
162 
163                 for (loop = 0; loop < nr_pages; loop++)
164                         ClearPageFsCache(pvec.pages[loop]);
165 
166                 first = pvec.pages[nr_pages - 1]->index + 1;
167 
168                 pvec.nr = nr_pages;
169                 pagevec_release(&pvec);
170                 cond_resched();
171         }
172 }
173 
174 static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
175         .name           = "CEPH.inode",
176         .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
177         .get_key        = ceph_fscache_inode_get_key,
178         .get_attr       = ceph_fscache_inode_get_attr,
179         .get_aux        = ceph_fscache_inode_get_aux,
180         .check_aux      = ceph_fscache_inode_check_aux,
181         .now_uncached   = ceph_fscache_inode_now_uncached,
182 };
183 
184 void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
185                                         struct ceph_inode_info* ci)
186 {
187         struct inode* inode = &ci->vfs_inode;
188 
189         /* No caching for filesystem */
190         if (fsc->fscache == NULL)
191                 return;
192 
193         /* Only cache for regular files that are read only */
194         if ((ci->vfs_inode.i_mode & S_IFREG) == 0)
195                 return;
196 
197         /* Avoid multiple racing open requests */
198         inode_lock(inode);
199 
200         if (ci->fscache)
201                 goto done;
202 
203         ci->fscache = fscache_acquire_cookie(fsc->fscache,
204                                              &ceph_fscache_inode_object_def,
205                                              ci, true);
206         fscache_check_consistency(ci->fscache);
207 done:
208         inode_unlock(inode);
209 
210 }
211 
212 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
213 {
214         struct fscache_cookie* cookie;
215 
216         if ((cookie = ci->fscache) == NULL)
217                 return;
218 
219         ci->fscache = NULL;
220 
221         fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
222         fscache_relinquish_cookie(cookie, 0);
223 }
224 
225 static void ceph_vfs_readpage_complete(struct page *page, void *data, int error)
226 {
227         if (!error)
228                 SetPageUptodate(page);
229 }
230 
231 static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error)
232 {
233         if (!error)
234                 SetPageUptodate(page);
235 
236         unlock_page(page);
237 }
238 
239 static inline int cache_valid(struct ceph_inode_info *ci)
240 {
241         return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) &&
242                 (ci->i_fscache_gen == ci->i_rdcache_gen));
243 }
244 
245 
246 /* Atempt to read from the fscache,
247  *
248  * This function is called from the readpage_nounlock context. DO NOT attempt to
249  * unlock the page here (or in the callback).
250  */
251 int ceph_readpage_from_fscache(struct inode *inode, struct page *page)
252 {
253         struct ceph_inode_info *ci = ceph_inode(inode);
254         int ret;
255 
256         if (!cache_valid(ci))
257                 return -ENOBUFS;
258 
259         ret = fscache_read_or_alloc_page(ci->fscache, page,
260                                          ceph_vfs_readpage_complete, NULL,
261                                          GFP_KERNEL);
262 
263         switch (ret) {
264                 case 0: /* Page found */
265                         dout("page read submitted\n");
266                         return 0;
267                 case -ENOBUFS: /* Pages were not found, and can't be */
268                 case -ENODATA: /* Pages were not found */
269                         dout("page/inode not in cache\n");
270                         return ret;
271                 default:
272                         dout("%s: unknown error ret = %i\n", __func__, ret);
273                         return ret;
274         }
275 }
276 
277 int ceph_readpages_from_fscache(struct inode *inode,
278                                   struct address_space *mapping,
279                                   struct list_head *pages,
280                                   unsigned *nr_pages)
281 {
282         struct ceph_inode_info *ci = ceph_inode(inode);
283         int ret;
284 
285         if (!cache_valid(ci))
286                 return -ENOBUFS;
287 
288         ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
289                                           ceph_vfs_readpage_complete_unlock,
290                                           NULL, mapping_gfp_mask(mapping));
291 
292         switch (ret) {
293                 case 0: /* All pages found */
294                         dout("all-page read submitted\n");
295                         return 0;
296                 case -ENOBUFS: /* Some pages were not found, and can't be */
297                 case -ENODATA: /* some pages were not found */
298                         dout("page/inode not in cache\n");
299                         return ret;
300                 default:
301                         dout("%s: unknown error ret = %i\n", __func__, ret);
302                         return ret;
303         }
304 }
305 
306 void ceph_readpage_to_fscache(struct inode *inode, struct page *page)
307 {
308         struct ceph_inode_info *ci = ceph_inode(inode);
309         int ret;
310 
311         if (!PageFsCache(page))
312                 return;
313 
314         if (!cache_valid(ci))
315                 return;
316 
317         ret = fscache_write_page(ci->fscache, page, GFP_KERNEL);
318         if (ret)
319                  fscache_uncache_page(ci->fscache, page);
320 }
321 
322 void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
323 {
324         struct ceph_inode_info *ci = ceph_inode(inode);
325 
326         if (!PageFsCache(page))
327                 return;
328 
329         fscache_wait_on_page_write(ci->fscache, page);
330         fscache_uncache_page(ci->fscache, page);
331 }
332 
333 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
334 {
335         if (fsc->revalidate_wq)
336                 destroy_workqueue(fsc->revalidate_wq);
337 
338         fscache_relinquish_cookie(fsc->fscache, 0);
339         fsc->fscache = NULL;
340 }
341 
342 static void ceph_revalidate_work(struct work_struct *work)
343 {
344         int issued;
345         u32 orig_gen;
346         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
347                                                   i_revalidate_work);
348         struct inode *inode = &ci->vfs_inode;
349 
350         spin_lock(&ci->i_ceph_lock);
351         issued = __ceph_caps_issued(ci, NULL);
352         orig_gen = ci->i_rdcache_gen;
353         spin_unlock(&ci->i_ceph_lock);
354 
355         if (!(issued & CEPH_CAP_FILE_CACHE)) {
356                 dout("revalidate_work lost cache before validation %p\n",
357                      inode);
358                 goto out;
359         }
360 
361         if (!fscache_check_consistency(ci->fscache))
362                 fscache_invalidate(ci->fscache);
363 
364         spin_lock(&ci->i_ceph_lock);
365         /* Update the new valid generation (backwards sanity check too) */
366         if (orig_gen > ci->i_fscache_gen) {
367                 ci->i_fscache_gen = orig_gen;
368         }
369         spin_unlock(&ci->i_ceph_lock);
370 
371 out:
372         iput(&ci->vfs_inode);
373 }
374 
375 void ceph_queue_revalidate(struct inode *inode)
376 {
377         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
378         struct ceph_inode_info *ci = ceph_inode(inode);
379 
380         if (fsc->revalidate_wq == NULL || ci->fscache == NULL)
381                 return;
382 
383         ihold(inode);
384 
385         if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq,
386                        &ci->i_revalidate_work)) {
387                 dout("ceph_queue_revalidate %p\n", inode);
388         } else {
389                 dout("ceph_queue_revalidate %p failed\n)", inode);
390                 iput(inode);
391         }
392 }
393 
394 void ceph_fscache_inode_init(struct ceph_inode_info *ci)
395 {
396         ci->fscache = NULL;
397         /* The first load is verifed cookie open time */
398         ci->i_fscache_gen = 1;
399         INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work);
400 }
401 

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