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eb497943fa
Convert the 9p filesystem to use the netfs helper lib to handle readpage, readahead and write_begin, converting those into a common issue_op for the filesystem itself to handle. The netfs helper lib also handles reading from fscache if a cache is available, and interleaving reads from both sources. This change also switches from the old fscache I/O API to the new one, meaning that fscache no longer keeps track of netfs pages and instead does async DIO between the backing files and the 9p file pagecache. As a part of this change, the handling of PG_fscache changes. It now just means that the cache has a write I/O operation in progress on a page (PG_locked is used for a read I/O op). Note that this is a cut-down version of the fscache rewrite and does not change any of the cookie and cache coherency handling. Changes ======= ver #4: - Rebase on top of folios. - Don't use wait_on_page_bit_killable(). ver #3: - v9fs_req_issue_op() needs to terminate the subrequest. - v9fs_write_end() needs to call SetPageUptodate() a bit more often. - It's not CONFIG_{AFS,V9FS}_FSCACHE[1] - v9fs_init_rreq() should take a ref on the p9_fid and the cleanup should drop it [from Dominique Martinet]. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-and-tested-by: Dominique Martinet <asmadeus@codewreck.org> cc: v9fs-developer@lists.sourceforge.net cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/YUm+xucHxED+1MJp@codewreck.org/ [1] Link: https://lore.kernel.org/r/163162772646.438332.16323773205855053535.stgit@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/163189109885.2509237.7153668924503399173.stgit@warthog.procyon.org.uk/ # rfc v2 Link: https://lore.kernel.org/r/163363943896.1980952.1226527304649419689.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/163551662876.1877519.14706391695553204156.stgit@warthog.procyon.org.uk/ # v4 Link: https://lore.kernel.org/r/163584179557.4023316.11089762304657644342.stgit@warthog.procyon.org.uk # rebase on folio Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* V9FS cache definitions.
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*
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* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
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*/
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#ifndef _9P_CACHE_H
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#define _9P_CACHE_H
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#define FSCACHE_USE_NEW_IO_API
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#include <linux/fscache.h>
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#ifdef CONFIG_9P_FSCACHE
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extern struct fscache_netfs v9fs_cache_netfs;
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extern const struct fscache_cookie_def v9fs_cache_session_index_def;
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extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
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extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
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extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
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extern void v9fs_cache_inode_get_cookie(struct inode *inode);
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extern void v9fs_cache_inode_put_cookie(struct inode *inode);
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extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
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extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
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extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
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extern int __v9fs_cache_register(void);
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extern void __v9fs_cache_unregister(void);
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#else /* CONFIG_9P_FSCACHE */
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static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
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{
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}
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static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
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{
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}
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static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
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{
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}
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#endif /* CONFIG_9P_FSCACHE */
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#endif /* _9P_CACHE_H */
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