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bc899ee1c8
Add a netfs_i_context struct that should be included in the network
filesystem's own inode struct wrapper, directly after the VFS's inode
struct, e.g.:
struct my_inode {
struct {
/* These must be contiguous */
struct inode vfs_inode;
struct netfs_i_context netfs_ctx;
};
};
The netfs_i_context struct so far contains a single field for the network
filesystem to use - the cache cookie:
struct netfs_i_context {
...
struct fscache_cookie *cache;
};
Three functions are provided to help with this:
(1) void netfs_i_context_init(struct inode *inode,
const struct netfs_request_ops *ops);
Initialise the netfs context and set the operations.
(2) struct netfs_i_context *netfs_i_context(struct inode *inode);
Find the netfs context from the VFS inode.
(3) struct inode *netfs_inode(struct netfs_i_context *ctx);
Find the VFS inode from the netfs context.
Changes
=======
ver #4)
- Fix netfs_is_cache_enabled() to check cookie->cache_priv to see if a
cache is present[3].
- Fix netfs_skip_folio_read() to zero out all of the page, not just some
of it[3].
ver #3)
- Split out the bit to move ceph cap-getting on readahead into
ceph_init_request()[1].
- Stick in a comment to the netfs inode structs indicating the contiguity
requirements[2].
ver #2)
- Adjust documentation to match.
- Use "#if IS_ENABLED()" in netfs_i_cookie(), not "#ifdef".
- Move the cap check from ceph_readahead() to ceph_init_request() to be
called from netfslib.
- Remove ceph_readahead() and use netfs_readahead() directly instead.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/8af0d47f17d89c06bbf602496dd845f2b0bf25b3.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/beaf4f6a6c2575ed489adb14b257253c868f9a5c.camel@kernel.org/ [2]
Link: https://lore.kernel.org/r/3536452.1647421585@warthog.procyon.org.uk/ [3]
Link: https://lore.kernel.org/r/164622984545.3564931.15691742939278418580.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678213320.1200972.16807551936267647470.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692909854.2099075.9535537286264248057.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/306388.1647595110@warthog.procyon.org.uk/ # v4
148 lines
3.6 KiB
C
148 lines
3.6 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 struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
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{
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return netfs_i_cookie(&ci->vfs_inode);
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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_io_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_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_io_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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