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3ee1a1fc39
Make the cifs filesystem use netfslib to handle reading and writing on
behalf of cifs. The changes include:
(1) Various read_iter/write_iter type functions are turned into wrappers
around netfslib API functions or are pointed directly at those
functions:
cifs_file_direct{,_nobrl}_ops switch to use
netfs_unbuffered_read_iter and netfs_unbuffered_write_iter.
Large pieces of code that will be removed are #if'd out and will be removed
in subsequent patches.
[?] Why does cifs mark the page dirty in the destination buffer of a DIO
read? Should that happen automatically? Does netfs need to do that?
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 */
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/*
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* CIFS filesystem cache interface definitions
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*
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* Copyright (c) 2010 Novell, Inc.
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* Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
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*
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*/
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#ifndef _CIFS_FSCACHE_H
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#define _CIFS_FSCACHE_H
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#include <linux/swap.h>
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#include <linux/fscache.h>
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#include "cifsglob.h"
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/*
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* Coherency data attached to CIFS volume within the cache
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*/
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struct cifs_fscache_volume_coherency_data {
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__le64 resource_id; /* unique server resource id */
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__le64 vol_create_time;
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__le32 vol_serial_number;
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} __packed;
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/*
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* Coherency data attached to CIFS inode within the cache.
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*/
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struct cifs_fscache_inode_coherency_data {
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__le64 last_write_time_sec;
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__le64 last_change_time_sec;
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__le32 last_write_time_nsec;
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__le32 last_change_time_nsec;
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};
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#ifdef CONFIG_CIFS_FSCACHE
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/*
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* fscache.c
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*/
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extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
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extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
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extern void cifs_fscache_get_inode_cookie(struct inode *inode);
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extern void cifs_fscache_release_inode_cookie(struct inode *);
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extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
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static inline
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void cifs_fscache_fill_coherency(struct inode *inode,
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struct cifs_fscache_inode_coherency_data *cd)
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{
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struct timespec64 ctime = inode_get_ctime(inode);
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struct timespec64 mtime = inode_get_mtime(inode);
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memset(cd, 0, sizeof(*cd));
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cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec);
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cd->last_write_time_nsec = cpu_to_le32(mtime.tv_nsec);
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cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec);
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cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
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}
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static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
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{
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return netfs_i_cookie(&CIFS_I(inode)->netfs);
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}
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static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
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{
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struct cifs_fscache_inode_coherency_data cd;
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cifs_fscache_fill_coherency(inode, &cd);
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fscache_invalidate(cifs_inode_cookie(inode), &cd,
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i_size_read(inode), flags);
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}
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#if 0 // TODO remove
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extern int __cifs_fscache_query_occupancy(struct inode *inode,
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pgoff_t first, unsigned int nr_pages,
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pgoff_t *_data_first,
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unsigned int *_data_nr_pages);
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static inline int cifs_fscache_query_occupancy(struct inode *inode,
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pgoff_t first, unsigned int nr_pages,
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pgoff_t *_data_first,
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unsigned int *_data_nr_pages)
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{
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if (!cifs_inode_cookie(inode))
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return -ENOBUFS;
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return __cifs_fscache_query_occupancy(inode, first, nr_pages,
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_data_first, _data_nr_pages);
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}
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extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
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extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len);
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static inline int cifs_readpage_from_fscache(struct inode *inode,
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struct page *page)
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{
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if (cifs_inode_cookie(inode))
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return __cifs_readpage_from_fscache(inode, page);
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return -ENOBUFS;
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}
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static inline void cifs_readahead_to_fscache(struct inode *inode,
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loff_t pos, size_t len)
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{
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if (cifs_inode_cookie(inode))
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__cifs_readahead_to_fscache(inode, pos, len);
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}
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#endif
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static inline bool cifs_fscache_enabled(struct inode *inode)
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{
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return fscache_cookie_enabled(cifs_inode_cookie(inode));
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}
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#else /* CONFIG_CIFS_FSCACHE */
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static inline
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void cifs_fscache_fill_coherency(struct inode *inode,
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struct cifs_fscache_inode_coherency_data *cd)
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{
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}
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static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
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static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
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static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
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static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
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static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
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static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
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static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
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static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }
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#if 0 // TODO remove
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static inline int cifs_fscache_query_occupancy(struct inode *inode,
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pgoff_t first, unsigned int nr_pages,
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pgoff_t *_data_first,
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unsigned int *_data_nr_pages)
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{
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*_data_first = ULONG_MAX;
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*_data_nr_pages = 0;
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return -ENOBUFS;
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}
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static inline int
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cifs_readpage_from_fscache(struct inode *inode, struct page *page)
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{
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return -ENOBUFS;
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}
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static inline
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void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {}
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#endif
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#endif /* CONFIG_CIFS_FSCACHE */
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#endif /* _CIFS_FSCACHE_H */
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