diff options
Diffstat (limited to 'fs/smb/client/fscache.h')
| -rw-r--r-- | fs/smb/client/fscache.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h new file mode 100644 index 0000000000..a3d7372091 --- /dev/null +++ b/fs/smb/client/fscache.h @@ -0,0 +1,149 @@ +/* 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 timespec64 ctime = inode_get_ctime(inode); + struct timespec64 mtime = inode_get_mtime(inode); + + memset(cd, 0, sizeof(*cd)); + cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec); + cd->last_write_time_nsec = cpu_to_le32(mtime.tv_nsec); + cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec); + cd->last_change_time_nsec = cpu_to_le32(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 */ |