include/sys/kmem.h

   1 /*
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://zfsonlinux.org/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #ifndef _SPL_KMEM_H
  26 #define _SPL_KMEM_H
  27
  28 #include <linux/slab.h>
  29 #include <linux/sched.h>
  30
  31 extern int kmem_debugging(void);
  32 extern char *kmem_vasprintf(const char *fmt, va_list ap);
  33 extern char *kmem_asprintf(const char *fmt, ...);
  34 extern char *strdup(const char *str);
  35 extern void strfree(char *str);
  36
  37 /*
  38  * Memory allocation interfaces
  39  */
  40 #define KM_SLEEP        0x0000  /* can block for memory; success guaranteed */
  41 #define KM_NOSLEEP      0x0001  /* cannot block for memory; may fail */
  42 #define KM_PUSHPAGE     0x0004  /* can block for memory; may use reserve */
  43 #define KM_ZERO         0x1000  /* zero the allocation */
  44 #define KM_VMEM         0x2000  /* caller is vmem_* wrapper */
  45
  46 #define KM_PUBLIC_MASK  (KM_SLEEP | KM_NOSLEEP | KM_PUSHPAGE)
  47
  48 /*
  49  * Convert a KM_* flags mask to its Linux GFP_* counterpart.  The conversion
  50  * function is context aware which means that KM_SLEEP allocations can be
  51  * safely used in syncing contexts which have set PF_FSTRANS.
  52  */
  53 static inline gfp_t
  54 kmem_flags_convert(int flags)
  55 {
  56         gfp_t lflags = __GFP_NOWARN | __GFP_COMP;
  57
  58         if (flags & KM_NOSLEEP) {
  59                 lflags |= GFP_ATOMIC | __GFP_NORETRY;
  60         } else {
  61                 lflags |= GFP_KERNEL;
  62                 if ((current->flags & PF_FSTRANS))
  63                         lflags &= ~(__GFP_IO|__GFP_FS);
  64         }
  65
  66         if (flags & KM_PUSHPAGE)
  67                 lflags |= __GFP_HIGH;
  68
  69         if (flags & KM_ZERO)
  70                 lflags |= __GFP_ZERO;
  71
  72         return (lflags);
  73 }
  74
  75 #ifdef HAVE_ATOMIC64_T
  76 #define kmem_alloc_used_add(size)       atomic64_add(size, &kmem_alloc_used)
  77 #define kmem_alloc_used_sub(size)       atomic64_sub(size, &kmem_alloc_used)
  78 #define kmem_alloc_used_read()          atomic64_read(&kmem_alloc_used)
  79 #define kmem_alloc_used_set(size)       atomic64_set(&kmem_alloc_used, size)
  80 extern atomic64_t kmem_alloc_used;
  81 extern unsigned long long kmem_alloc_max;
  82 #else  /* HAVE_ATOMIC64_T */
  83 #define kmem_alloc_used_add(size)       atomic_add(size, &kmem_alloc_used)
  84 #define kmem_alloc_used_sub(size)       atomic_sub(size, &kmem_alloc_used)
  85 #define kmem_alloc_used_read()          atomic_read(&kmem_alloc_used)
  86 #define kmem_alloc_used_set(size)       atomic_set(&kmem_alloc_used, size)
  87 extern atomic_t kmem_alloc_used;
  88 extern unsigned long long kmem_alloc_max;
  89 #endif /* HAVE_ATOMIC64_T */
  90
  91 extern unsigned int spl_kmem_alloc_warn;
  92 extern unsigned int spl_kmem_alloc_max;
  93
  94 #define kmem_alloc(sz, fl)      spl_kmem_alloc((sz), (fl), __func__, __LINE__)
  95 #define kmem_zalloc(sz, fl)     spl_kmem_zalloc((sz), (fl), __func__, __LINE__)
  96 #define kmem_free(ptr, sz)      spl_kmem_free((ptr), (sz))
  97
  98 extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
  99 extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
 100 extern void spl_kmem_free(const void *ptr, size_t sz);
 101
 102 /*
 103  * The following functions are only available for internal use.
 104  */
 105 extern void *spl_kmem_alloc_impl(size_t size, int flags, int node);
 106 extern void *spl_kmem_alloc_debug(size_t size, int flags, int node);
 107 extern void *spl_kmem_alloc_track(size_t size, int flags,
 108     const char *func, int line, int node);
 109 extern void spl_kmem_free_impl(const void *buf, size_t size);
 110 extern void spl_kmem_free_debug(const void *buf, size_t size);
 111 extern void spl_kmem_free_track(const void *buf, size_t size);
 112
 113 extern int spl_kmem_init(void);
 114 extern void spl_kmem_fini(void);
 115
 116 #endif  /* _SPL_KMEM_H */