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1/* SPDX-License-Identifier: LGPL-2.1 */2/*3 * CIFS filesystem cache interface definitions4 *5 * Copyright (c) 2010 Novell, Inc.6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>7 *8 */9#ifndef _CIFS_FSCACHE_H10#define _CIFS_FSCACHE_H11 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 cache19 */20struct 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 */29struct 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_FSCACHE37 38/*39 * fscache.c40 */41extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);42extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);43 44extern void cifs_fscache_get_inode_cookie(struct inode *inode);45extern void cifs_fscache_release_inode_cookie(struct inode *);46extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);47 48static inline49void cifs_fscache_fill_coherency(struct inode *inode,50 struct cifs_fscache_inode_coherency_data *cd)51{52 struct timespec64 ctime = inode_get_ctime(inode);53 struct timespec64 mtime = inode_get_mtime(inode);54 55 memset(cd, 0, sizeof(*cd));56 cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec);57 cd->last_write_time_nsec = cpu_to_le32(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 63static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)64{65 return netfs_i_cookie(&CIFS_I(inode)->netfs);66}67 68static 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 77static inline bool cifs_fscache_enabled(struct inode *inode)78{79 return fscache_cookie_enabled(cifs_inode_cookie(inode));80}81 82#else /* CONFIG_CIFS_FSCACHE */83static inline84void cifs_fscache_fill_coherency(struct inode *inode,85 struct cifs_fscache_inode_coherency_data *cd)86{87}88 89static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }90static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}91 92static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}93static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}94static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}95static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }96static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}97static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }98 99#endif /* CONFIG_CIFS_FSCACHE */100 101#endif /* _CIFS_FSCACHE_H */102