199ccbd22SMilosz Tanski /* 299ccbd22SMilosz Tanski * Ceph cache definitions. 399ccbd22SMilosz Tanski * 499ccbd22SMilosz Tanski * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. 599ccbd22SMilosz Tanski * Written by Milosz Tanski (milosz@adfin.com) 699ccbd22SMilosz Tanski * 799ccbd22SMilosz Tanski * This program is free software; you can redistribute it and/or modify 899ccbd22SMilosz Tanski * it under the terms of the GNU General Public License version 2 999ccbd22SMilosz Tanski * as published by the Free Software Foundation. 1099ccbd22SMilosz Tanski * 1199ccbd22SMilosz Tanski * This program is distributed in the hope that it will be useful, 1299ccbd22SMilosz Tanski * but WITHOUT ANY WARRANTY; without even the implied warranty of 1399ccbd22SMilosz Tanski * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1499ccbd22SMilosz Tanski * GNU General Public License for more details. 1599ccbd22SMilosz Tanski * 1699ccbd22SMilosz Tanski * You should have received a copy of the GNU General Public License 1799ccbd22SMilosz Tanski * along with this program; if not, write to: 1899ccbd22SMilosz Tanski * Free Software Foundation 1999ccbd22SMilosz Tanski * 51 Franklin Street, Fifth Floor 2099ccbd22SMilosz Tanski * Boston, MA 02111-1301 USA 2199ccbd22SMilosz Tanski * 2299ccbd22SMilosz Tanski */ 2399ccbd22SMilosz Tanski 2499ccbd22SMilosz Tanski #include "super.h" 2599ccbd22SMilosz Tanski #include "cache.h" 2699ccbd22SMilosz Tanski 2799ccbd22SMilosz Tanski struct ceph_aux_inode { 28f6973c09SYan, Zheng u64 version; 2999ccbd22SMilosz Tanski struct timespec mtime; 3099ccbd22SMilosz Tanski loff_t size; 3199ccbd22SMilosz Tanski }; 3299ccbd22SMilosz Tanski 3399ccbd22SMilosz Tanski struct fscache_netfs ceph_cache_netfs = { 3499ccbd22SMilosz Tanski .name = "ceph", 3599ccbd22SMilosz Tanski .version = 0, 3699ccbd22SMilosz Tanski }; 3799ccbd22SMilosz Tanski 381d8f8360SYan, Zheng static DEFINE_MUTEX(ceph_fscache_lock); 391d8f8360SYan, Zheng static LIST_HEAD(ceph_fscache_list); 401d8f8360SYan, Zheng 411d8f8360SYan, Zheng struct ceph_fscache_entry { 421d8f8360SYan, Zheng struct list_head list; 431d8f8360SYan, Zheng struct fscache_cookie *fscache; 441d8f8360SYan, Zheng struct ceph_fsid fsid; 451d8f8360SYan, Zheng size_t uniq_len; 461d8f8360SYan, Zheng char uniquifier[0]; 471d8f8360SYan, Zheng }; 481d8f8360SYan, Zheng 4999ccbd22SMilosz Tanski static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data, 5099ccbd22SMilosz Tanski void *buffer, uint16_t maxbuf) 5199ccbd22SMilosz Tanski { 5299ccbd22SMilosz Tanski const struct ceph_fs_client* fsc = cookie_netfs_data; 531d8f8360SYan, Zheng const char *fscache_uniq = fsc->mount_options->fscache_uniq; 541d8f8360SYan, Zheng uint16_t fsid_len, uniq_len; 5599ccbd22SMilosz Tanski 561d8f8360SYan, Zheng fsid_len = sizeof(fsc->client->fsid); 571d8f8360SYan, Zheng uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0; 581d8f8360SYan, Zheng if (fsid_len + uniq_len > maxbuf) 5999ccbd22SMilosz Tanski return 0; 6099ccbd22SMilosz Tanski 611d8f8360SYan, Zheng memcpy(buffer, &fsc->client->fsid, fsid_len); 621d8f8360SYan, Zheng if (uniq_len) 631d8f8360SYan, Zheng memcpy(buffer + fsid_len, fscache_uniq, uniq_len); 641d8f8360SYan, Zheng 651d8f8360SYan, Zheng return fsid_len + uniq_len; 6699ccbd22SMilosz Tanski } 6799ccbd22SMilosz Tanski 6899ccbd22SMilosz Tanski static const struct fscache_cookie_def ceph_fscache_fsid_object_def = { 6999ccbd22SMilosz Tanski .name = "CEPH.fsid", 7099ccbd22SMilosz Tanski .type = FSCACHE_COOKIE_TYPE_INDEX, 7199ccbd22SMilosz Tanski .get_key = ceph_fscache_session_get_key, 7299ccbd22SMilosz Tanski }; 7399ccbd22SMilosz Tanski 74971f0bdeSMilosz Tanski int ceph_fscache_register(void) 7599ccbd22SMilosz Tanski { 7699ccbd22SMilosz Tanski return fscache_register_netfs(&ceph_cache_netfs); 7799ccbd22SMilosz Tanski } 7899ccbd22SMilosz Tanski 79971f0bdeSMilosz Tanski void ceph_fscache_unregister(void) 8099ccbd22SMilosz Tanski { 8199ccbd22SMilosz Tanski fscache_unregister_netfs(&ceph_cache_netfs); 8299ccbd22SMilosz Tanski } 8399ccbd22SMilosz Tanski 8499ccbd22SMilosz Tanski int ceph_fscache_register_fs(struct ceph_fs_client* fsc) 8599ccbd22SMilosz Tanski { 861d8f8360SYan, Zheng const struct ceph_fsid *fsid = &fsc->client->fsid; 871d8f8360SYan, Zheng const char *fscache_uniq = fsc->mount_options->fscache_uniq; 881d8f8360SYan, Zheng size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0; 891d8f8360SYan, Zheng struct ceph_fscache_entry *ent; 901d8f8360SYan, Zheng int err = 0; 911d8f8360SYan, Zheng 921d8f8360SYan, Zheng mutex_lock(&ceph_fscache_lock); 931d8f8360SYan, Zheng list_for_each_entry(ent, &ceph_fscache_list, list) { 941d8f8360SYan, Zheng if (memcmp(&ent->fsid, fsid, sizeof(*fsid))) 951d8f8360SYan, Zheng continue; 961d8f8360SYan, Zheng if (ent->uniq_len != uniq_len) 971d8f8360SYan, Zheng continue; 981d8f8360SYan, Zheng if (uniq_len && memcmp(ent->uniquifier, fscache_uniq, uniq_len)) 991d8f8360SYan, Zheng continue; 1001d8f8360SYan, Zheng 1011d8f8360SYan, Zheng pr_err("fscache cookie already registered for fsid %pU\n", fsid); 1021d8f8360SYan, Zheng pr_err(" use fsc=%%s mount option to specify a uniquifier\n"); 1031d8f8360SYan, Zheng err = -EBUSY; 1041d8f8360SYan, Zheng goto out_unlock; 1051d8f8360SYan, Zheng } 1061d8f8360SYan, Zheng 1071d8f8360SYan, Zheng ent = kzalloc(sizeof(*ent) + uniq_len, GFP_KERNEL); 1081d8f8360SYan, Zheng if (!ent) { 1091d8f8360SYan, Zheng err = -ENOMEM; 1101d8f8360SYan, Zheng goto out_unlock; 1111d8f8360SYan, Zheng } 1121d8f8360SYan, Zheng 11399ccbd22SMilosz Tanski fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index, 11499ccbd22SMilosz Tanski &ceph_fscache_fsid_object_def, 11594d30ae9SDavid Howells fsc, true); 11699ccbd22SMilosz Tanski 1171d8f8360SYan, Zheng if (fsc->fscache) { 1181d8f8360SYan, Zheng memcpy(&ent->fsid, fsid, sizeof(*fsid)); 1191d8f8360SYan, Zheng if (uniq_len > 0) { 1201d8f8360SYan, Zheng memcpy(&ent->uniquifier, fscache_uniq, uniq_len); 1211d8f8360SYan, Zheng ent->uniq_len = uniq_len; 1221d8f8360SYan, Zheng } 1231d8f8360SYan, Zheng ent->fscache = fsc->fscache; 1241d8f8360SYan, Zheng list_add_tail(&ent->list, &ceph_fscache_list); 1251d8f8360SYan, Zheng } else { 1261d8f8360SYan, Zheng kfree(ent); 1271d8f8360SYan, Zheng pr_err("unable to register fscache cookie for fsid %pU\n", 1281d8f8360SYan, Zheng fsid); 1291d8f8360SYan, Zheng /* all other fs ignore this error */ 1301d8f8360SYan, Zheng } 1311d8f8360SYan, Zheng out_unlock: 1321d8f8360SYan, Zheng mutex_unlock(&ceph_fscache_lock); 1331d8f8360SYan, Zheng return err; 13499ccbd22SMilosz Tanski } 13599ccbd22SMilosz Tanski 13699ccbd22SMilosz Tanski static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data, 13799ccbd22SMilosz Tanski void *buffer, uint16_t maxbuf) 13899ccbd22SMilosz Tanski { 13999ccbd22SMilosz Tanski const struct ceph_inode_info* ci = cookie_netfs_data; 14099ccbd22SMilosz Tanski uint16_t klen; 14199ccbd22SMilosz Tanski 1421291fb95SGeliang Tang /* use ceph virtual inode (id + snapshot) */ 14399ccbd22SMilosz Tanski klen = sizeof(ci->i_vino); 14499ccbd22SMilosz Tanski if (klen > maxbuf) 14599ccbd22SMilosz Tanski return 0; 14699ccbd22SMilosz Tanski 14799ccbd22SMilosz Tanski memcpy(buffer, &ci->i_vino, klen); 14899ccbd22SMilosz Tanski return klen; 14999ccbd22SMilosz Tanski } 15099ccbd22SMilosz Tanski 15199ccbd22SMilosz Tanski static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data, 15299ccbd22SMilosz Tanski void *buffer, uint16_t bufmax) 15399ccbd22SMilosz Tanski { 15499ccbd22SMilosz Tanski struct ceph_aux_inode aux; 15599ccbd22SMilosz Tanski const struct ceph_inode_info* ci = cookie_netfs_data; 15699ccbd22SMilosz Tanski const struct inode* inode = &ci->vfs_inode; 15799ccbd22SMilosz Tanski 15899ccbd22SMilosz Tanski memset(&aux, 0, sizeof(aux)); 159f6973c09SYan, Zheng aux.version = ci->i_version; 16099ccbd22SMilosz Tanski aux.mtime = inode->i_mtime; 16199c88e69SYan, Zheng aux.size = i_size_read(inode); 16299ccbd22SMilosz Tanski 16399ccbd22SMilosz Tanski memcpy(buffer, &aux, sizeof(aux)); 16499ccbd22SMilosz Tanski 16599ccbd22SMilosz Tanski return sizeof(aux); 16699ccbd22SMilosz Tanski } 16799ccbd22SMilosz Tanski 16899ccbd22SMilosz Tanski static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data, 16999ccbd22SMilosz Tanski uint64_t *size) 17099ccbd22SMilosz Tanski { 17199ccbd22SMilosz Tanski const struct ceph_inode_info* ci = cookie_netfs_data; 17299c88e69SYan, Zheng *size = i_size_read(&ci->vfs_inode); 17399ccbd22SMilosz Tanski } 17499ccbd22SMilosz Tanski 17599ccbd22SMilosz Tanski static enum fscache_checkaux ceph_fscache_inode_check_aux( 17699ccbd22SMilosz Tanski void *cookie_netfs_data, const void *data, uint16_t dlen) 17799ccbd22SMilosz Tanski { 17899ccbd22SMilosz Tanski struct ceph_aux_inode aux; 17999ccbd22SMilosz Tanski struct ceph_inode_info* ci = cookie_netfs_data; 18099ccbd22SMilosz Tanski struct inode* inode = &ci->vfs_inode; 18199ccbd22SMilosz Tanski 18299ccbd22SMilosz Tanski if (dlen != sizeof(aux)) 18399ccbd22SMilosz Tanski return FSCACHE_CHECKAUX_OBSOLETE; 18499ccbd22SMilosz Tanski 18599ccbd22SMilosz Tanski memset(&aux, 0, sizeof(aux)); 186f6973c09SYan, Zheng aux.version = ci->i_version; 18799ccbd22SMilosz Tanski aux.mtime = inode->i_mtime; 18899c88e69SYan, Zheng aux.size = i_size_read(inode); 18999ccbd22SMilosz Tanski 19099ccbd22SMilosz Tanski if (memcmp(data, &aux, sizeof(aux)) != 0) 19199ccbd22SMilosz Tanski return FSCACHE_CHECKAUX_OBSOLETE; 19299ccbd22SMilosz Tanski 19399ccbd22SMilosz Tanski dout("ceph inode 0x%p cached okay", ci); 19499ccbd22SMilosz Tanski return FSCACHE_CHECKAUX_OKAY; 19599ccbd22SMilosz Tanski } 19699ccbd22SMilosz Tanski 19799ccbd22SMilosz Tanski static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data) 19899ccbd22SMilosz Tanski { 19999ccbd22SMilosz Tanski struct ceph_inode_info* ci = cookie_netfs_data; 20099ccbd22SMilosz Tanski struct pagevec pvec; 20199ccbd22SMilosz Tanski pgoff_t first; 20299ccbd22SMilosz Tanski int loop, nr_pages; 20399ccbd22SMilosz Tanski 20499ccbd22SMilosz Tanski pagevec_init(&pvec, 0); 20599ccbd22SMilosz Tanski first = 0; 20699ccbd22SMilosz Tanski 20799ccbd22SMilosz Tanski dout("ceph inode 0x%p now uncached", ci); 20899ccbd22SMilosz Tanski 20999ccbd22SMilosz Tanski while (1) { 21099ccbd22SMilosz Tanski nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first, 21199ccbd22SMilosz Tanski PAGEVEC_SIZE - pagevec_count(&pvec)); 21299ccbd22SMilosz Tanski 21399ccbd22SMilosz Tanski if (!nr_pages) 21499ccbd22SMilosz Tanski break; 21599ccbd22SMilosz Tanski 21699ccbd22SMilosz Tanski for (loop = 0; loop < nr_pages; loop++) 21799ccbd22SMilosz Tanski ClearPageFsCache(pvec.pages[loop]); 21899ccbd22SMilosz Tanski 21999ccbd22SMilosz Tanski first = pvec.pages[nr_pages - 1]->index + 1; 22099ccbd22SMilosz Tanski 22199ccbd22SMilosz Tanski pvec.nr = nr_pages; 22299ccbd22SMilosz Tanski pagevec_release(&pvec); 22399ccbd22SMilosz Tanski cond_resched(); 22499ccbd22SMilosz Tanski } 22599ccbd22SMilosz Tanski } 22699ccbd22SMilosz Tanski 22799ccbd22SMilosz Tanski static const struct fscache_cookie_def ceph_fscache_inode_object_def = { 22899ccbd22SMilosz Tanski .name = "CEPH.inode", 22999ccbd22SMilosz Tanski .type = FSCACHE_COOKIE_TYPE_DATAFILE, 23099ccbd22SMilosz Tanski .get_key = ceph_fscache_inode_get_key, 23199ccbd22SMilosz Tanski .get_attr = ceph_fscache_inode_get_attr, 23299ccbd22SMilosz Tanski .get_aux = ceph_fscache_inode_get_aux, 23399ccbd22SMilosz Tanski .check_aux = ceph_fscache_inode_check_aux, 23499ccbd22SMilosz Tanski .now_uncached = ceph_fscache_inode_now_uncached, 23599ccbd22SMilosz Tanski }; 23699ccbd22SMilosz Tanski 23746b59b2bSYan, Zheng void ceph_fscache_register_inode_cookie(struct inode *inode) 23899ccbd22SMilosz Tanski { 23946b59b2bSYan, Zheng struct ceph_inode_info *ci = ceph_inode(inode); 24046b59b2bSYan, Zheng struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 24199ccbd22SMilosz Tanski 24299ccbd22SMilosz Tanski /* No caching for filesystem */ 24399ccbd22SMilosz Tanski if (fsc->fscache == NULL) 24499ccbd22SMilosz Tanski return; 24599ccbd22SMilosz Tanski 24699ccbd22SMilosz Tanski /* Only cache for regular files that are read only */ 24746b59b2bSYan, Zheng if (!S_ISREG(inode->i_mode)) 24899ccbd22SMilosz Tanski return; 24999ccbd22SMilosz Tanski 25046b59b2bSYan, Zheng inode_lock_nested(inode, I_MUTEX_CHILD); 25146b59b2bSYan, Zheng if (!ci->fscache) { 25299ccbd22SMilosz Tanski ci->fscache = fscache_acquire_cookie(fsc->fscache, 25399ccbd22SMilosz Tanski &ceph_fscache_inode_object_def, 25446b59b2bSYan, Zheng ci, false); 25546b59b2bSYan, Zheng } 2565955102cSAl Viro inode_unlock(inode); 25799ccbd22SMilosz Tanski } 25899ccbd22SMilosz Tanski 25999ccbd22SMilosz Tanski void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) 26099ccbd22SMilosz Tanski { 26199ccbd22SMilosz Tanski struct fscache_cookie* cookie; 26299ccbd22SMilosz Tanski 26399ccbd22SMilosz Tanski if ((cookie = ci->fscache) == NULL) 26499ccbd22SMilosz Tanski return; 26599ccbd22SMilosz Tanski 26699ccbd22SMilosz Tanski ci->fscache = NULL; 26799ccbd22SMilosz Tanski 26899ccbd22SMilosz Tanski fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode); 26999ccbd22SMilosz Tanski fscache_relinquish_cookie(cookie, 0); 27099ccbd22SMilosz Tanski } 27199ccbd22SMilosz Tanski 27246b59b2bSYan, Zheng static bool ceph_fscache_can_enable(void *data) 27346b59b2bSYan, Zheng { 27446b59b2bSYan, Zheng struct inode *inode = data; 27546b59b2bSYan, Zheng return !inode_is_open_for_write(inode); 27646b59b2bSYan, Zheng } 27746b59b2bSYan, Zheng 27846b59b2bSYan, Zheng void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp) 27946b59b2bSYan, Zheng { 28046b59b2bSYan, Zheng struct ceph_inode_info *ci = ceph_inode(inode); 28146b59b2bSYan, Zheng 28246b59b2bSYan, Zheng if (!fscache_cookie_valid(ci->fscache)) 28346b59b2bSYan, Zheng return; 28446b59b2bSYan, Zheng 28546b59b2bSYan, Zheng if (inode_is_open_for_write(inode)) { 28646b59b2bSYan, Zheng dout("fscache_file_set_cookie %p %p disabling cache\n", 28746b59b2bSYan, Zheng inode, filp); 28846b59b2bSYan, Zheng fscache_disable_cookie(ci->fscache, false); 28946b59b2bSYan, Zheng fscache_uncache_all_inode_pages(ci->fscache, inode); 29046b59b2bSYan, Zheng } else { 29146b59b2bSYan, Zheng fscache_enable_cookie(ci->fscache, ceph_fscache_can_enable, 29246b59b2bSYan, Zheng inode); 29346b59b2bSYan, Zheng if (fscache_cookie_enabled(ci->fscache)) { 2940fbc5360SColin Ian King dout("fscache_file_set_cookie %p %p enabling cache\n", 29546b59b2bSYan, Zheng inode, filp); 29646b59b2bSYan, Zheng } 29746b59b2bSYan, Zheng } 29846b59b2bSYan, Zheng } 29946b59b2bSYan, Zheng 30099ccbd22SMilosz Tanski static void ceph_vfs_readpage_complete(struct page *page, void *data, int error) 30199ccbd22SMilosz Tanski { 30299ccbd22SMilosz Tanski if (!error) 30399ccbd22SMilosz Tanski SetPageUptodate(page); 30499ccbd22SMilosz Tanski } 30599ccbd22SMilosz Tanski 30699ccbd22SMilosz Tanski static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error) 30799ccbd22SMilosz Tanski { 30899ccbd22SMilosz Tanski if (!error) 30999ccbd22SMilosz Tanski SetPageUptodate(page); 31099ccbd22SMilosz Tanski 31199ccbd22SMilosz Tanski unlock_page(page); 31299ccbd22SMilosz Tanski } 31399ccbd22SMilosz Tanski 3143b33f692SZhang Zhuoyu static inline bool cache_valid(struct ceph_inode_info *ci) 31599ccbd22SMilosz Tanski { 316f7f7e7a0SYan, Zheng return ci->i_fscache_gen == ci->i_rdcache_gen; 31799ccbd22SMilosz Tanski } 31899ccbd22SMilosz Tanski 31999ccbd22SMilosz Tanski 32099ccbd22SMilosz Tanski /* Atempt to read from the fscache, 32199ccbd22SMilosz Tanski * 32299ccbd22SMilosz Tanski * This function is called from the readpage_nounlock context. DO NOT attempt to 32399ccbd22SMilosz Tanski * unlock the page here (or in the callback). 32499ccbd22SMilosz Tanski */ 32599ccbd22SMilosz Tanski int ceph_readpage_from_fscache(struct inode *inode, struct page *page) 32699ccbd22SMilosz Tanski { 32799ccbd22SMilosz Tanski struct ceph_inode_info *ci = ceph_inode(inode); 32899ccbd22SMilosz Tanski int ret; 32999ccbd22SMilosz Tanski 33099ccbd22SMilosz Tanski if (!cache_valid(ci)) 33199ccbd22SMilosz Tanski return -ENOBUFS; 33299ccbd22SMilosz Tanski 33399ccbd22SMilosz Tanski ret = fscache_read_or_alloc_page(ci->fscache, page, 33499ccbd22SMilosz Tanski ceph_vfs_readpage_complete, NULL, 33599ccbd22SMilosz Tanski GFP_KERNEL); 33699ccbd22SMilosz Tanski 33799ccbd22SMilosz Tanski switch (ret) { 33899ccbd22SMilosz Tanski case 0: /* Page found */ 33999ccbd22SMilosz Tanski dout("page read submitted\n"); 34099ccbd22SMilosz Tanski return 0; 34199ccbd22SMilosz Tanski case -ENOBUFS: /* Pages were not found, and can't be */ 34299ccbd22SMilosz Tanski case -ENODATA: /* Pages were not found */ 34399ccbd22SMilosz Tanski dout("page/inode not in cache\n"); 34499ccbd22SMilosz Tanski return ret; 34599ccbd22SMilosz Tanski default: 34699ccbd22SMilosz Tanski dout("%s: unknown error ret = %i\n", __func__, ret); 34799ccbd22SMilosz Tanski return ret; 34899ccbd22SMilosz Tanski } 34999ccbd22SMilosz Tanski } 35099ccbd22SMilosz Tanski 35199ccbd22SMilosz Tanski int ceph_readpages_from_fscache(struct inode *inode, 35299ccbd22SMilosz Tanski struct address_space *mapping, 35399ccbd22SMilosz Tanski struct list_head *pages, 35499ccbd22SMilosz Tanski unsigned *nr_pages) 35599ccbd22SMilosz Tanski { 35699ccbd22SMilosz Tanski struct ceph_inode_info *ci = ceph_inode(inode); 35799ccbd22SMilosz Tanski int ret; 35899ccbd22SMilosz Tanski 35999ccbd22SMilosz Tanski if (!cache_valid(ci)) 36099ccbd22SMilosz Tanski return -ENOBUFS; 36199ccbd22SMilosz Tanski 36299ccbd22SMilosz Tanski ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages, 36399ccbd22SMilosz Tanski ceph_vfs_readpage_complete_unlock, 36499ccbd22SMilosz Tanski NULL, mapping_gfp_mask(mapping)); 36599ccbd22SMilosz Tanski 36699ccbd22SMilosz Tanski switch (ret) { 36799ccbd22SMilosz Tanski case 0: /* All pages found */ 36899ccbd22SMilosz Tanski dout("all-page read submitted\n"); 36999ccbd22SMilosz Tanski return 0; 37099ccbd22SMilosz Tanski case -ENOBUFS: /* Some pages were not found, and can't be */ 37199ccbd22SMilosz Tanski case -ENODATA: /* some pages were not found */ 37299ccbd22SMilosz Tanski dout("page/inode not in cache\n"); 37399ccbd22SMilosz Tanski return ret; 37499ccbd22SMilosz Tanski default: 37599ccbd22SMilosz Tanski dout("%s: unknown error ret = %i\n", __func__, ret); 37699ccbd22SMilosz Tanski return ret; 37799ccbd22SMilosz Tanski } 37899ccbd22SMilosz Tanski } 37999ccbd22SMilosz Tanski 38099ccbd22SMilosz Tanski void ceph_readpage_to_fscache(struct inode *inode, struct page *page) 38199ccbd22SMilosz Tanski { 38299ccbd22SMilosz Tanski struct ceph_inode_info *ci = ceph_inode(inode); 38399ccbd22SMilosz Tanski int ret; 38499ccbd22SMilosz Tanski 3859b8dd1e8SMilosz Tanski if (!PageFsCache(page)) 3869b8dd1e8SMilosz Tanski return; 3879b8dd1e8SMilosz Tanski 38899ccbd22SMilosz Tanski if (!cache_valid(ci)) 38999ccbd22SMilosz Tanski return; 39099ccbd22SMilosz Tanski 39199ccbd22SMilosz Tanski ret = fscache_write_page(ci->fscache, page, GFP_KERNEL); 39299ccbd22SMilosz Tanski if (ret) 39399ccbd22SMilosz Tanski fscache_uncache_page(ci->fscache, page); 39499ccbd22SMilosz Tanski } 39599ccbd22SMilosz Tanski 39699ccbd22SMilosz Tanski void ceph_invalidate_fscache_page(struct inode* inode, struct page *page) 39799ccbd22SMilosz Tanski { 39899ccbd22SMilosz Tanski struct ceph_inode_info *ci = ceph_inode(inode); 39999ccbd22SMilosz Tanski 400ffc79664SMilosz Tanski if (!PageFsCache(page)) 401ffc79664SMilosz Tanski return; 402ffc79664SMilosz Tanski 40399ccbd22SMilosz Tanski fscache_wait_on_page_write(ci->fscache, page); 40499ccbd22SMilosz Tanski fscache_uncache_page(ci->fscache, page); 40599ccbd22SMilosz Tanski } 40699ccbd22SMilosz Tanski 40799ccbd22SMilosz Tanski void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) 40899ccbd22SMilosz Tanski { 4091d8f8360SYan, Zheng if (fscache_cookie_valid(fsc->fscache)) { 4101d8f8360SYan, Zheng struct ceph_fscache_entry *ent; 4111d8f8360SYan, Zheng bool found = false; 4121d8f8360SYan, Zheng 4131d8f8360SYan, Zheng mutex_lock(&ceph_fscache_lock); 4141d8f8360SYan, Zheng list_for_each_entry(ent, &ceph_fscache_list, list) { 4151d8f8360SYan, Zheng if (ent->fscache == fsc->fscache) { 4161d8f8360SYan, Zheng list_del(&ent->list); 4171d8f8360SYan, Zheng kfree(ent); 4181d8f8360SYan, Zheng found = true; 4191d8f8360SYan, Zheng break; 4201d8f8360SYan, Zheng } 4211d8f8360SYan, Zheng } 4221d8f8360SYan, Zheng WARN_ON_ONCE(!found); 4231d8f8360SYan, Zheng mutex_unlock(&ceph_fscache_lock); 4241d8f8360SYan, Zheng 4251d8f8360SYan, Zheng __fscache_relinquish_cookie(fsc->fscache, 0); 4261d8f8360SYan, Zheng } 42799ccbd22SMilosz Tanski fsc->fscache = NULL; 42899ccbd22SMilosz Tanski } 42999ccbd22SMilosz Tanski 430f7f7e7a0SYan, Zheng /* 431f7f7e7a0SYan, Zheng * caller should hold CEPH_CAP_FILE_{RD,CACHE} 432f7f7e7a0SYan, Zheng */ 433f7f7e7a0SYan, Zheng void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci) 43499ccbd22SMilosz Tanski { 435f7f7e7a0SYan, Zheng if (cache_valid(ci)) 436e81568ebSMilosz Tanski return; 437e81568ebSMilosz Tanski 438f7f7e7a0SYan, Zheng /* resue i_truncate_mutex. There should be no pending 439f7f7e7a0SYan, Zheng * truncate while the caller holds CEPH_CAP_FILE_RD */ 440f7f7e7a0SYan, Zheng mutex_lock(&ci->i_truncate_mutex); 441f7f7e7a0SYan, Zheng if (!cache_valid(ci)) { 442f7f7e7a0SYan, Zheng if (fscache_check_consistency(ci->fscache)) 443f7f7e7a0SYan, Zheng fscache_invalidate(ci->fscache); 444f7f7e7a0SYan, Zheng spin_lock(&ci->i_ceph_lock); 445f7f7e7a0SYan, Zheng ci->i_fscache_gen = ci->i_rdcache_gen; 446f7f7e7a0SYan, Zheng spin_unlock(&ci->i_ceph_lock); 44799ccbd22SMilosz Tanski } 448f7f7e7a0SYan, Zheng mutex_unlock(&ci->i_truncate_mutex); 44999ccbd22SMilosz Tanski } 450