/* SPDX-License-Identifier: LGPL-2.1 */ /* * CIFS filesystem cache interface definitions * * Copyright (c) 2010 Novell, Inc. * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> * */ #ifndef _CIFS_FSCACHE_H #define _CIFS_FSCACHE_H #include <linux/swap.h> #include <linux/fscache.h> #include "cifsglob.h" /* * Coherency data attached to CIFS volume within the cache */ struct cifs_fscache_volume_coherency_data { __le64 resource_id; /* unique server resource id */ __le64 vol_create_time; __le32 vol_serial_number; } __packed; /* * Coherency data attached to CIFS inode within the cache. */ struct cifs_fscache_inode_coherency_data { __le64 last_write_time_sec; __le64 last_change_time_sec; __le32 last_write_time_nsec; __le32 last_change_time_nsec; }; #ifdef CONFIG_CIFS_FSCACHE /* * fscache.c */ extern int cifs_fscache_get_super_cookie(struct cifs_tcon *); extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); extern void cifs_fscache_get_inode_cookie(struct inode *inode); extern void cifs_fscache_release_inode_cookie(struct inode *); extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update); static inline void cifs_fscache_fill_coherency(struct inode *inode, struct cifs_fscache_inode_coherency_data *cd) { struct cifsInodeInfo *cifsi = CIFS_I(inode); memset(cd, 0, sizeof(*cd)); cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec); cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec); cd->last_change_time_sec = cpu_to_le64(cifsi->netfs.inode.i_ctime.tv_sec); cd->last_change_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_ctime.tv_nsec); } static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return netfs_i_cookie(&CIFS_I(inode)->netfs); } static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) { struct cifs_fscache_inode_coherency_data cd; cifs_fscache_fill_coherency(inode, &cd); fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), flags); } extern int __cifs_fscache_query_occupancy(struct inode *inode, pgoff_t first, unsigned int nr_pages, pgoff_t *_data_first, unsigned int *_data_nr_pages); static inline int cifs_fscache_query_occupancy(struct inode *inode, pgoff_t first, unsigned int nr_pages, pgoff_t *_data_first, unsigned int *_data_nr_pages) { if (!cifs_inode_cookie(inode)) return -ENOBUFS; return __cifs_fscache_query_occupancy(inode, first, nr_pages, _data_first, _data_nr_pages); } extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage); extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len); static inline int cifs_readpage_from_fscache(struct inode *inode, struct page *page) { if (cifs_inode_cookie(inode)) return __cifs_readpage_from_fscache(inode, page); return -ENOBUFS; } static inline void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) { if (cifs_inode_cookie(inode)) __cifs_readahead_to_fscache(inode, pos, len); } #else /* CONFIG_CIFS_FSCACHE */ static inline void cifs_fscache_fill_coherency(struct inode *inode, struct cifs_fscache_inode_coherency_data *cd) { } static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; } static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {} static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {} static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; } static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {} static inline int cifs_fscache_query_occupancy(struct inode *inode, pgoff_t first, unsigned int nr_pages, pgoff_t *_data_first, unsigned int *_data_nr_pages) { *_data_first = ULONG_MAX; *_data_nr_pages = 0; return -ENOBUFS; } static inline int cifs_readpage_from_fscache(struct inode *inode, struct page *page) { return -ENOBUFS; } static inline void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {} #endif /* CONFIG_CIFS_FSCACHE */ #endif /* _CIFS_FSCACHE_H */