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148 lines
4.3 KiB
148 lines
4.3 KiB
/* 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 ([email protected]> |
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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 cifsInodeInfo *cifsi = CIFS_I(inode); |
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memset(cd, 0, sizeof(*cd)); |
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cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec); |
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cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec); |
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cd->last_change_time_sec = cpu_to_le64(cifsi->netfs.inode.i_ctime.tv_sec); |
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cd->last_change_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_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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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_readpage_to_fscache(struct inode *pinode, struct page *ppage); |
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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_readpage_to_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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__cifs_readpage_to_fscache(inode, page); |
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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 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_readpage_to_fscache(struct inode *inode, struct page *page) {} |
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#endif /* CONFIG_CIFS_FSCACHE */ |
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#endif /* _CIFS_FSCACHE_H */
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