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400e1286c0
Now that the fscache API has been reworked and simplified, change ceph over to use it. With the old API, we would only instantiate a cookie when the file was open for reads. Change it to instantiate the cookie when the inode is instantiated and call use/unuse when the file is opened/closed. Also, ensure we resize the cached data on truncates, and invalidate the cache in response to the appropriate events. This will allow us to plumb in write support later. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: David Howells <dhowells@redhat.com> Link: https://lore.kernel.org/r/20211129162907.149445-2-jlayton@kernel.org/ # v1 Link: https://lore.kernel.org/r/20211207134451.66296-2-jlayton@kernel.org/ # v2 Link: https://lore.kernel.org/r/163906984277.143852.14697110691303589000.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967188351.1823006.5065634844099079351.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021581427.640689.14128682147127509264.stgit@warthog.procyon.org.uk/ # v4
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Ceph cache definitions.
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*
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* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
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* Written by Milosz Tanski (milosz@adfin.com)
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*/
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#ifndef _CEPH_CACHE_H
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#define _CEPH_CACHE_H
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#include <linux/netfs.h>
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#ifdef CONFIG_CEPH_FSCACHE
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#include <linux/fscache.h>
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int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
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void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
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void ceph_fscache_register_inode_cookie(struct inode *inode);
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
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void ceph_fscache_use_cookie(struct inode *inode, bool will_modify);
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void ceph_fscache_unuse_cookie(struct inode *inode, bool update);
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void ceph_fscache_update(struct inode *inode);
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void ceph_fscache_invalidate(struct inode *inode, bool dio_write);
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static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
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{
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ci->fscache = NULL;
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}
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static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
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{
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return ci->fscache;
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}
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static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
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if (cookie) {
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ceph_fscache_use_cookie(inode, true);
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fscache_resize_cookie(cookie, to);
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ceph_fscache_unuse_cookie(inode, true);
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}
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}
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static inline void ceph_fscache_unpin_writeback(struct inode *inode,
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struct writeback_control *wbc)
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{
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fscache_unpin_writeback(wbc, ceph_fscache_cookie(ceph_inode(inode)));
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}
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static inline int ceph_fscache_set_page_dirty(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct ceph_inode_info *ci = ceph_inode(inode);
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return fscache_set_page_dirty(page, ceph_fscache_cookie(ci));
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}
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static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
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{
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struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
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return fscache_begin_read_operation(&rreq->cache_resources, cookie);
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}
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static inline bool ceph_is_cache_enabled(struct inode *inode)
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{
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return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
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}
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static inline void ceph_fscache_note_page_release(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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fscache_note_page_release(ceph_fscache_cookie(ci));
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}
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#else /* CONFIG_CEPH_FSCACHE */
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static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
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struct fs_context *fc)
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{
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return 0;
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}
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static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
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{
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}
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static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
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{
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}
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static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
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{
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}
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static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
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{
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}
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static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
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{
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}
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static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
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{
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}
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static inline void ceph_fscache_update(struct inode *inode)
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{
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}
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static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
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{
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}
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static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
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{
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return NULL;
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}
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static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
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{
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}
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static inline void ceph_fscache_unpin_writeback(struct inode *inode,
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struct writeback_control *wbc)
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{
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}
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static inline int ceph_fscache_set_page_dirty(struct page *page)
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{
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return __set_page_dirty_nobuffers(page);
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}
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static inline bool ceph_is_cache_enabled(struct inode *inode)
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{
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return false;
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}
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static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
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{
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return -ENOBUFS;
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}
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static inline void ceph_fscache_note_page_release(struct inode *inode)
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{
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}
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#endif /* CONFIG_CEPH_FSCACHE */
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#endif
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