1 /* SPDX-License-Identifier: LGPL-2.1 */ 2 /* 3 * CIFS filesystem cache interface definitions 4 * 5 * Copyright (c) 2010 Novell, Inc. 6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de> 7 * 8 */ 9 #ifndef _CIFS_FSCACHE_H 10 #define _CIFS_FSCACHE_H 11 12 #include <linux/swap.h> 13 #include <linux/fscache.h> 14 15 #include "cifsglob.h" 16 17 /* 18 * Coherency data attached to CIFS volume within the cache 19 */ 20 struct cifs_fscache_volume_coherency_data { 21 __le64 resource_id; /* unique server resource id */ 22 __le64 vol_create_time; 23 __le32 vol_serial_number; 24 } __packed; 25 26 /* 27 * Coherency data attached to CIFS inode within the cache. 28 */ 29 struct cifs_fscache_inode_coherency_data { 30 __le64 last_write_time_sec; 31 __le64 last_change_time_sec; 32 __le32 last_write_time_nsec; 33 __le32 last_change_time_nsec; 34 }; 35 36 #ifdef CONFIG_CIFS_FSCACHE 37 38 /* 39 * fscache.c 40 */ 41 extern int cifs_fscache_get_super_cookie(struct cifs_tcon *); 42 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); 43 44 extern void cifs_fscache_get_inode_cookie(struct inode *inode); 45 extern void cifs_fscache_release_inode_cookie(struct inode *); 46 extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update); 47 48 static inline 49 void cifs_fscache_fill_coherency(struct inode *inode, 50 struct cifs_fscache_inode_coherency_data *cd) 51 { 52 struct cifsInodeInfo *cifsi = CIFS_I(inode); 53 struct timespec64 ctime = inode_get_ctime(inode); 54 55 memset(cd, 0, sizeof(*cd)); 56 cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec); 57 cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec); 58 cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec); 59 cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec); 60 } 61 62 63 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) 64 { 65 return netfs_i_cookie(&CIFS_I(inode)->netfs); 66 } 67 68 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) 69 { 70 struct cifs_fscache_inode_coherency_data cd; 71 72 cifs_fscache_fill_coherency(inode, &cd); 73 fscache_invalidate(cifs_inode_cookie(inode), &cd, 74 i_size_read(inode), flags); 75 } 76 77 extern int __cifs_fscache_query_occupancy(struct inode *inode, 78 pgoff_t first, unsigned int nr_pages, 79 pgoff_t *_data_first, 80 unsigned int *_data_nr_pages); 81 82 static inline int cifs_fscache_query_occupancy(struct inode *inode, 83 pgoff_t first, unsigned int nr_pages, 84 pgoff_t *_data_first, 85 unsigned int *_data_nr_pages) 86 { 87 if (!cifs_inode_cookie(inode)) 88 return -ENOBUFS; 89 return __cifs_fscache_query_occupancy(inode, first, nr_pages, 90 _data_first, _data_nr_pages); 91 } 92 93 extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage); 94 extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len); 95 96 97 static inline int cifs_readpage_from_fscache(struct inode *inode, 98 struct page *page) 99 { 100 if (cifs_inode_cookie(inode)) 101 return __cifs_readpage_from_fscache(inode, page); 102 return -ENOBUFS; 103 } 104 105 static inline void cifs_readahead_to_fscache(struct inode *inode, 106 loff_t pos, size_t len) 107 { 108 if (cifs_inode_cookie(inode)) 109 __cifs_readahead_to_fscache(inode, pos, len); 110 } 111 112 #else /* CONFIG_CIFS_FSCACHE */ 113 static inline 114 void cifs_fscache_fill_coherency(struct inode *inode, 115 struct cifs_fscache_inode_coherency_data *cd) 116 { 117 } 118 119 static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; } 120 static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} 121 122 static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {} 123 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} 124 static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {} 125 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; } 126 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {} 127 128 static inline int cifs_fscache_query_occupancy(struct inode *inode, 129 pgoff_t first, unsigned int nr_pages, 130 pgoff_t *_data_first, 131 unsigned int *_data_nr_pages) 132 { 133 *_data_first = ULONG_MAX; 134 *_data_nr_pages = 0; 135 return -ENOBUFS; 136 } 137 138 static inline int 139 cifs_readpage_from_fscache(struct inode *inode, struct page *page) 140 { 141 return -ENOBUFS; 142 } 143 144 static inline 145 void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {} 146 147 #endif /* CONFIG_CIFS_FSCACHE */ 148 149 #endif /* _CIFS_FSCACHE_H */ 150