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fs/ceph/cache.c
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/* * Ceph cache definitions. * * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. * Written by Milosz Tanski (milosz@adfin.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ |
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#include "super.h" #include "cache.h" struct ceph_aux_inode { |
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u64 version; |
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struct timespec mtime; loff_t size; }; struct fscache_netfs ceph_cache_netfs = { .name = "ceph", .version = 0, }; static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data, void *buffer, uint16_t maxbuf) { const struct ceph_fs_client* fsc = cookie_netfs_data; uint16_t klen; klen = sizeof(fsc->client->fsid); if (klen > maxbuf) return 0; memcpy(buffer, &fsc->client->fsid, klen); return klen; } static const struct fscache_cookie_def ceph_fscache_fsid_object_def = { .name = "CEPH.fsid", .type = FSCACHE_COOKIE_TYPE_INDEX, .get_key = ceph_fscache_session_get_key, }; |
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int ceph_fscache_register(void) |
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{ return fscache_register_netfs(&ceph_cache_netfs); } |
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void ceph_fscache_unregister(void) |
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{ fscache_unregister_netfs(&ceph_cache_netfs); } int ceph_fscache_register_fs(struct ceph_fs_client* fsc) { fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index, &ceph_fscache_fsid_object_def, |
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fsc, true); |
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if (!fsc->fscache) |
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pr_err("Unable to register fsid: %p fscache cookie ", fsc); |
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return 0; } static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data, void *buffer, uint16_t maxbuf) { const struct ceph_inode_info* ci = cookie_netfs_data; uint16_t klen; |
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/* use ceph virtual inode (id + snapshot) */ |
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klen = sizeof(ci->i_vino); if (klen > maxbuf) return 0; memcpy(buffer, &ci->i_vino, klen); return klen; } static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data, void *buffer, uint16_t bufmax) { struct ceph_aux_inode aux; const struct ceph_inode_info* ci = cookie_netfs_data; const struct inode* inode = &ci->vfs_inode; memset(&aux, 0, sizeof(aux)); |
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aux.version = ci->i_version; |
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aux.mtime = inode->i_mtime; |
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aux.size = i_size_read(inode); |
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memcpy(buffer, &aux, sizeof(aux)); return sizeof(aux); } static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data, uint64_t *size) { const struct ceph_inode_info* ci = cookie_netfs_data; |
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*size = i_size_read(&ci->vfs_inode); |
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} static enum fscache_checkaux ceph_fscache_inode_check_aux( void *cookie_netfs_data, const void *data, uint16_t dlen) { struct ceph_aux_inode aux; struct ceph_inode_info* ci = cookie_netfs_data; struct inode* inode = &ci->vfs_inode; if (dlen != sizeof(aux)) return FSCACHE_CHECKAUX_OBSOLETE; memset(&aux, 0, sizeof(aux)); |
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aux.version = ci->i_version; |
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aux.mtime = inode->i_mtime; |
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aux.size = i_size_read(inode); |
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if (memcmp(data, &aux, sizeof(aux)) != 0) return FSCACHE_CHECKAUX_OBSOLETE; dout("ceph inode 0x%p cached okay", ci); return FSCACHE_CHECKAUX_OKAY; } static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data) { struct ceph_inode_info* ci = cookie_netfs_data; struct pagevec pvec; pgoff_t first; int loop, nr_pages; pagevec_init(&pvec, 0); first = 0; dout("ceph inode 0x%p now uncached", ci); while (1) { nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first, PAGEVEC_SIZE - pagevec_count(&pvec)); if (!nr_pages) break; for (loop = 0; loop < nr_pages; loop++) ClearPageFsCache(pvec.pages[loop]); first = pvec.pages[nr_pages - 1]->index + 1; pvec.nr = nr_pages; pagevec_release(&pvec); cond_resched(); } } static const struct fscache_cookie_def ceph_fscache_inode_object_def = { .name = "CEPH.inode", .type = FSCACHE_COOKIE_TYPE_DATAFILE, .get_key = ceph_fscache_inode_get_key, .get_attr = ceph_fscache_inode_get_attr, .get_aux = ceph_fscache_inode_get_aux, .check_aux = ceph_fscache_inode_check_aux, .now_uncached = ceph_fscache_inode_now_uncached, }; |
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void ceph_fscache_register_inode_cookie(struct inode *inode) |
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{ |
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struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
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/* No caching for filesystem */ if (fsc->fscache == NULL) return; /* Only cache for regular files that are read only */ |
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if (!S_ISREG(inode->i_mode)) |
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return; |
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inode_lock_nested(inode, I_MUTEX_CHILD); if (!ci->fscache) { ci->fscache = fscache_acquire_cookie(fsc->fscache, &ceph_fscache_inode_object_def, ci, false); } |
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inode_unlock(inode); |
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} void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) { struct fscache_cookie* cookie; if ((cookie = ci->fscache) == NULL) return; ci->fscache = NULL; fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode); fscache_relinquish_cookie(cookie, 0); } |
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static bool ceph_fscache_can_enable(void *data) { struct inode *inode = data; return !inode_is_open_for_write(inode); } void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp) { struct ceph_inode_info *ci = ceph_inode(inode); if (!fscache_cookie_valid(ci->fscache)) return; if (inode_is_open_for_write(inode)) { dout("fscache_file_set_cookie %p %p disabling cache ", inode, filp); fscache_disable_cookie(ci->fscache, false); fscache_uncache_all_inode_pages(ci->fscache, inode); } else { fscache_enable_cookie(ci->fscache, ceph_fscache_can_enable, inode); if (fscache_cookie_enabled(ci->fscache)) { dout("fscache_file_set_cookie %p %p enabing cache ", inode, filp); } } } |
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static void ceph_vfs_readpage_complete(struct page *page, void *data, int error) { if (!error) SetPageUptodate(page); } static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error) { if (!error) SetPageUptodate(page); unlock_page(page); } |
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static inline bool cache_valid(struct ceph_inode_info *ci) |
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{ |
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return ci->i_fscache_gen == ci->i_rdcache_gen; |
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} /* Atempt to read from the fscache, * * This function is called from the readpage_nounlock context. DO NOT attempt to * unlock the page here (or in the callback). */ int ceph_readpage_from_fscache(struct inode *inode, struct page *page) { struct ceph_inode_info *ci = ceph_inode(inode); int ret; if (!cache_valid(ci)) return -ENOBUFS; ret = fscache_read_or_alloc_page(ci->fscache, page, ceph_vfs_readpage_complete, NULL, GFP_KERNEL); switch (ret) { case 0: /* Page found */ dout("page read submitted "); return 0; case -ENOBUFS: /* Pages were not found, and can't be */ case -ENODATA: /* Pages were not found */ dout("page/inode not in cache "); return ret; default: dout("%s: unknown error ret = %i ", __func__, ret); return ret; } } int ceph_readpages_from_fscache(struct inode *inode, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages) { struct ceph_inode_info *ci = ceph_inode(inode); int ret; if (!cache_valid(ci)) return -ENOBUFS; ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages, ceph_vfs_readpage_complete_unlock, NULL, mapping_gfp_mask(mapping)); switch (ret) { case 0: /* All pages found */ dout("all-page read submitted "); return 0; case -ENOBUFS: /* Some pages were not found, and can't be */ case -ENODATA: /* some pages were not found */ dout("page/inode not in cache "); return ret; default: dout("%s: unknown error ret = %i ", __func__, ret); return ret; } } void ceph_readpage_to_fscache(struct inode *inode, struct page *page) { struct ceph_inode_info *ci = ceph_inode(inode); int ret; |
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if (!PageFsCache(page)) return; |
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if (!cache_valid(ci)) return; ret = fscache_write_page(ci->fscache, page, GFP_KERNEL); if (ret) fscache_uncache_page(ci->fscache, page); } void ceph_invalidate_fscache_page(struct inode* inode, struct page *page) { struct ceph_inode_info *ci = ceph_inode(inode); |
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if (!PageFsCache(page)) return; |
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fscache_wait_on_page_write(ci->fscache, page); fscache_uncache_page(ci->fscache, page); } void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) { |
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fscache_relinquish_cookie(fsc->fscache, 0); fsc->fscache = NULL; } |
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/* * caller should hold CEPH_CAP_FILE_{RD,CACHE} */ void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci) |
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{ |
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if (cache_valid(ci)) |
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return; |
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/* resue i_truncate_mutex. There should be no pending * truncate while the caller holds CEPH_CAP_FILE_RD */ mutex_lock(&ci->i_truncate_mutex); if (!cache_valid(ci)) { if (fscache_check_consistency(ci->fscache)) fscache_invalidate(ci->fscache); spin_lock(&ci->i_ceph_lock); ci->i_fscache_gen = ci->i_rdcache_gen; spin_unlock(&ci->i_ceph_lock); |
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} |
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mutex_unlock(&ci->i_truncate_mutex); |
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} |