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 int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon); 42 void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon); 43 void cifs_fscache_get_inode_cookie(struct inode *inode); 44 void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update); 45 void cifs_fscache_release_inode_cookie(struct inode *inode); 46 int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon); 47 void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon); 48 49 void cifs_fscache_get_inode_cookie(struct inode *inode); 50 void cifs_fscache_release_inode_cookie(struct inode *inode); 51 void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update); 52 53 static inline 54 void cifs_fscache_fill_coherency(struct inode *inode, 55 struct cifs_fscache_inode_coherency_data *cd) 56 { 57 struct timespec64 ctime = inode_get_ctime(inode); 58 struct timespec64 mtime = inode_get_mtime(inode); 59 60 memset(cd, 0, sizeof(*cd)); 61 cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec); 62 cd->last_write_time_nsec = cpu_to_le32(mtime.tv_nsec); 63 cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec); 64 cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec); 65 } 66 67 68 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) 69 { 70 return netfs_i_cookie(&CIFS_I(inode)->netfs); 71 } 72 73 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) 74 { 75 struct cifs_fscache_inode_coherency_data cd; 76 77 cifs_fscache_fill_coherency(inode, &cd); 78 fscache_invalidate(cifs_inode_cookie(inode), &cd, 79 i_size_read(inode), flags); 80 } 81 82 static inline bool cifs_fscache_enabled(struct inode *inode) 83 { 84 return fscache_cookie_enabled(cifs_inode_cookie(inode)); 85 } 86 87 #else /* CONFIG_CIFS_FSCACHE */ 88 static inline 89 void cifs_fscache_fill_coherency(struct inode *inode, 90 struct cifs_fscache_inode_coherency_data *cd) 91 { 92 } 93 94 static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; } 95 static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} 96 97 static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {} 98 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} 99 static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {} 100 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; } 101 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {} 102 static inline bool cifs_fscache_enabled(struct inode *inode) { return false; } 103 104 #endif /* CONFIG_CIFS_FSCACHE */ 105 106 #endif /* _CIFS_FSCACHE_H */ 107