Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  *   fs/cifs/fscache.h - CIFS filesystem cache interface definitions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *   Copyright (c) 2010 Novell, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *   This library is free software; you can redistribute it and/or modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *   it under the terms of the GNU Lesser General Public License as published
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *   by the Free Software Foundation; either version 2.1 of the License, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *   (at your option) any later version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *   This library is distributed in the hope that it will be useful,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *   the GNU Lesser General Public License for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *   You should have received a copy of the GNU Lesser General Public License
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *   along with this library; if not, write to the Free Software
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #ifndef _CIFS_FSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define _CIFS_FSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/fscache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "cifsglob.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #ifdef CONFIG_CIFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * Auxiliary data attached to CIFS superblock within the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) struct cifs_fscache_super_auxdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	u64	resource_id;		/* unique server resource id */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	__le64	vol_create_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	u32	vol_serial_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * Auxiliary data attached to CIFS inode within the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) struct cifs_fscache_inode_auxdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u64 last_write_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	u64 last_change_time_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	u32 last_write_time_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	u32 last_change_time_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	u64 eof;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * cache.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) extern struct fscache_netfs cifs_fscache_netfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) extern const struct fscache_cookie_def cifs_fscache_server_index_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) extern const struct fscache_cookie_def cifs_fscache_super_index_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) extern int cifs_fscache_register(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) extern void cifs_fscache_unregister(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) extern char *extract_sharename(const char *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * fscache.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) extern void cifs_fscache_release_inode_cookie(struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) extern void cifs_fscache_reset_inode_cookie(struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) extern int __cifs_readpages_from_fscache(struct inode *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 					 struct address_space *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 					 struct list_head *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 					 unsigned *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static inline void cifs_fscache_invalidate_page(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 					       struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		__cifs_fscache_invalidate_page(page, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static inline int cifs_readpage_from_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 					     struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (CIFS_I(inode)->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return __cifs_readpage_from_fscache(inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static inline int cifs_readpages_from_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 					      struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 					      struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 					      unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (CIFS_I(inode)->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return __cifs_readpages_from_fscache(inode, mapping, pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 						     nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static inline void cifs_readpage_to_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 					    struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		__cifs_readpage_to_fscache(inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static inline void cifs_fscache_readpages_cancel(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 						 struct list_head *pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (CIFS_I(inode)->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		return __cifs_fscache_readpages_cancel(inode, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #else /* CONFIG_CIFS_FSCACHE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static inline int cifs_fscache_register(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static inline void cifs_fscache_unregister(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 						 struct file *filp) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	return 1; /* May release page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static inline void cifs_fscache_invalidate_page(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) cifs_readpage_from_fscache(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static inline int cifs_readpages_from_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 					      struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 					      struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 					      unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static inline void cifs_readpage_to_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			struct page *page) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static inline void cifs_fscache_readpages_cancel(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 						 struct list_head *pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) #endif /* CONFIG_CIFS_FSCACHE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #endif /* _CIFS_FSCACHE_H */