fs/fscache/fscache-int.h

   1 /* fscache-int.h: internal definitions
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _FSCACHE_INT_H
  13 #define _FSCACHE_INT_H
  14
  15 #include <linux/fscache-cache.h>
  16 #include <linux/timer.h>
  17 #include <linux/bio.h>
  18
  19 extern kmem_cache_t *fscache_cookie_jar;
  20
  21 extern struct fscache_cookie fscache_fsdef_index;
  22 extern struct fscache_cookie_def fscache_fsdef_netfs_def;
  23
  24 extern void fscache_cookie_init_once(void *_cookie, kmem_cache_t *cachep, unsigned long flags);
  25
  26 /*
  27  * prevent the cache from being withdrawn whilst an operation is in progress
  28  * - returns false if the cache is being withdrawn already or if the cache is
  29  *   waiting to withdraw itself
  30  * - returns true if the cache was not being withdrawn
  31  * - fscache_withdraw_cache() will wait using down_write() until all ops are
  32  *   complete
  33  */
  34 static inline int fscache_operation_lock(struct fscache_object *object)
  35 {
  36         return down_read_trylock(&object->cache->withdrawal_sem);
  37 }
  38
  39 /*
  40  * release the operation lock
  41  */
  42 static inline void fscache_operation_unlock(struct fscache_object *object)
  43 {
  44         up_read(&object->cache->withdrawal_sem);
  45 }
  46
  47
  48 /*****************************************************************************/
  49 /*
  50  * debug tracing
  51  */
  52 #define dbgprintk(FMT,...) \
  53         printk("[%-6.6s] "FMT"\n",current->comm ,##__VA_ARGS__)
  54 #define _dbprintk(FMT,...) do { } while(0)
  55
  56 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
  57 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
  58 #define kdebug(FMT,...) dbgprintk(FMT ,##__VA_ARGS__)
  59
  60 #define kjournal(FMT,...) _dbprintk(FMT ,##__VA_ARGS__)
  61
  62 #define dbgfree(ADDR)  _dbprintk("%p:%d: FREEING %p",__FILE__,__LINE__,ADDR)
  63
  64 #define dbgpgalloc(PAGE)                                                \
  65 do {                                                                    \
  66         _dbprintk("PGALLOC %s:%d: %p {%lx,%lu}\n",                      \
  67                   __FILE__,__LINE__,                                    \
  68                   (PAGE),(PAGE)->mapping->host->i_ino,(PAGE)->index     \
  69                   );                                                    \
  70 } while(0)
  71
  72 #define dbgpgfree(PAGE)                                         \
  73 do {                                                            \
  74         if ((PAGE))                                             \
  75                 _dbprintk("PGFREE %s:%d: %p {%lx,%lu}\n",       \
  76                           __FILE__,__LINE__,                    \
  77                           (PAGE),                               \
  78                           (PAGE)->mapping->host->i_ino,         \
  79                           (PAGE)->index                         \
  80                           );                                    \
  81 } while(0)
  82
  83 #ifdef __KDEBUG
  84 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
  85 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
  86 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
  87 #else
  88 #define _enter(FMT,...) do { } while(0)
  89 #define _leave(FMT,...) do { } while(0)
  90 #define _debug(FMT,...) do { } while(0)
  91 #endif
  92
  93 #endif /* _FSCACHE_INT_H */