kerncompat.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __KERNCOMPAT_H__
  20 #define __KERNCOMPAT_H__
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <endian.h>
  27 #include <byteswap.h>
  28 #include <assert.h>
  29 #include <stddef.h>
  30 #include <linux/types.h>
  31 #include <stdint.h>
  32
  33 #include <features.h>
  34
  35 #ifndef __GLIBC__
  36 #ifndef BTRFS_DISABLE_BACKTRACE
  37 #define BTRFS_DISABLE_BACKTRACE
  38 #endif
  39 #define __always_inline __inline __attribute__ ((__always_inline__))
  40 #endif
  41
  42 #ifndef BTRFS_DISABLE_BACKTRACE
  43 #include <execinfo.h>
  44 #endif
  45
  46 #define ptr_to_u64(x)   ((u64)(uintptr_t)x)
  47 #define u64_to_ptr(x)   ((void *)(uintptr_t)x)
  48
  49 #ifndef READ
  50 #define READ 0
  51 #define WRITE 1
  52 #define READA 2
  53 #endif
  54
  55 #define gfp_t int
  56 #define get_cpu_var(p) (p)
  57 #define __get_cpu_var(p) (p)
  58 #define BITS_PER_BYTE 8
  59 #define BITS_PER_LONG (__SIZEOF_LONG__ * BITS_PER_BYTE)
  60 #define __GFP_BITS_SHIFT 20
  61 #define __GFP_BITS_MASK ((int)((1 << __GFP_BITS_SHIFT) - 1))
  62 #define GFP_KERNEL 0
  63 #define GFP_NOFS 0
  64 #define __read_mostly
  65 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  66
  67 #ifndef ULONG_MAX
  68 #define ULONG_MAX       (~0UL)
  69 #endif
  70
  71 #define __token_glue(a,b,c)     ___token_glue(a,b,c)
  72 #define ___token_glue(a,b,c)    a ## b ## c
  73 #ifdef DEBUG_BUILD_CHECKS
  74 #define BUILD_ASSERT(x)         extern int __token_glue(compile_time_assert_,__LINE__,__COUNTER__)[1-2*!(x)] __attribute__((unused))
  75 #else
  76 #define BUILD_ASSERT(x)
  77 #endif
  78
  79 #ifndef BTRFS_DISABLE_BACKTRACE
  80 #define MAX_BACKTRACE   16
  81 static inline void print_trace(void)
  82 {
  83         void *array[MAX_BACKTRACE];
  84         int size;
  85
  86         size = backtrace(array, MAX_BACKTRACE);
  87         backtrace_symbols_fd(array, size, 2);
  88 }
  89 #endif
  90
  91 static inline void warning_trace(const char *assertion, const char *filename,
  92                               const char *func, unsigned line, long val)
  93 {
  94         if (!val)
  95                 return;
  96         fprintf(stderr,
  97                 "%s:%d: %s: Warning: assertion `%s` failed, value %ld\n",
  98                 filename, line, func, assertion, val);
  99 #ifndef BTRFS_DISABLE_BACKTRACE
 100         print_trace();
 101 #endif
 102 }
 103
 104 static inline void bugon_trace(const char *assertion, const char *filename,
 105                               const char *func, unsigned line, long val)
 106 {
 107         if (!val)
 108                 return;
 109         fprintf(stderr,
 110                 "%s:%d: %s: BUG_ON `%s` triggered, value %ld\n",
 111                 filename, line, func, assertion, val);
 112 #ifndef BTRFS_DISABLE_BACKTRACE
 113         print_trace();
 114 #endif
 115         abort();
 116         exit(1);
 117 }
 118
 119 #ifdef __CHECKER__
 120 #define __force    __attribute__((force))
 121 #define __bitwise__ __attribute__((bitwise))
 122 #else
 123 #define __force
 124 #define __bitwise__
 125 #endif
 126
 127 #ifndef __CHECKER__
 128 /*
 129  * Since we're using primitive definitions from kernel-space, we need to
 130  * define __KERNEL__ so that system header files know which definitions
 131  * to use.
 132  */
 133 #define __KERNEL__
 134 #include <asm/types.h>
 135 typedef __u32 u32;
 136 typedef __u64 u64;
 137 typedef __u16 u16;
 138 typedef __u8 u8;
 139 typedef __s64 s64;
 140 typedef __s32 s32;
 141
 142 /*
 143  * Continuing to define __KERNEL__ breaks others parts of the code, so
 144  * we can just undefine it now that we have the correct headers...
 145  */
 146 #undef __KERNEL__
 147 #else
 148 typedef unsigned int u32;
 149 typedef unsigned int __u32;
 150 typedef unsigned long long u64;
 151 typedef unsigned char u8;
 152 typedef unsigned short u16;
 153 typedef long long s64;
 154 typedef int s32;
 155 #endif
 156
 157
 158 struct vma_shared { int prio_tree_node; };
 159 struct vm_area_struct {
 160         unsigned long vm_pgoff;
 161         unsigned long vm_start;
 162         unsigned long vm_end;
 163         struct vma_shared shared;
 164 };
 165
 166 struct page {
 167         unsigned long index;
 168 };
 169
 170 struct mutex {
 171         unsigned long lock;
 172 };
 173
 174 #define mutex_init(m)                                           \
 175 do {                                                            \
 176         (m)->lock = 1;                                          \
 177 } while (0)
 178
 179 static inline void mutex_lock(struct mutex *m)
 180 {
 181         m->lock--;
 182 }
 183
 184 static inline void mutex_unlock(struct mutex *m)
 185 {
 186         m->lock++;
 187 }
 188
 189 static inline int mutex_is_locked(struct mutex *m)
 190 {
 191         return (m->lock != 1);
 192 }
 193
 194 #define cond_resched()          do { } while (0)
 195 #define preempt_enable()        do { } while (0)
 196 #define preempt_disable()       do { } while (0)
 197
 198 #define BITOP_MASK(nr)          (1UL << ((nr) % BITS_PER_LONG))
 199 #define BITOP_WORD(nr)          ((nr) / BITS_PER_LONG)
 200
 201 #ifndef __attribute_const__
 202 #define __attribute_const__     __attribute__((__const__))
 203 #endif
 204
 205 /**
 206  * __set_bit - Set a bit in memory
 207  * @nr: the bit to set
 208  * @addr: the address to start counting from
 209  *
 210  * Unlike set_bit(), this function is non-atomic and may be reordered.
 211  * If it's called on the same region of memory simultaneously, the effect
 212  * may be that only one operation succeeds.
 213  */
 214 static inline void __set_bit(int nr, volatile unsigned long *addr)
 215 {
 216         unsigned long mask = BITOP_MASK(nr);
 217         unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 218
 219         *p  |= mask;
 220 }
 221
 222 static inline void __clear_bit(int nr, volatile unsigned long *addr)
 223 {
 224         unsigned long mask = BITOP_MASK(nr);
 225         unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 226
 227         *p &= ~mask;
 228 }
 229
 230 /**
 231  * test_bit - Determine whether a bit is set
 232  * @nr: bit number to test
 233  * @addr: Address to start counting from
 234  */
 235 static inline int test_bit(int nr, const volatile unsigned long *addr)
 236 {
 237         return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
 238 }
 239
 240 /*
 241  * error pointer
 242  */
 243 #define MAX_ERRNO       4095
 244 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
 245
 246 static inline void *ERR_PTR(long error)
 247 {
 248         return (void *) error;
 249 }
 250
 251 static inline long PTR_ERR(const void *ptr)
 252 {
 253         return (long) ptr;
 254 }
 255
 256 static inline int IS_ERR(const void *ptr)
 257 {
 258         return IS_ERR_VALUE((unsigned long)ptr);
 259 }
 260
 261 static inline int IS_ERR_OR_NULL(const void *ptr)
 262 {
 263         return !ptr || IS_ERR(ptr);
 264 }
 265
 266 /*
 267  * This looks more complex than it should be. But we need to
 268  * get the type for the ~ right in round_down (it needs to be
 269  * as wide as the result!), and we want to evaluate the macro
 270  * arguments just once each.
 271  */
 272 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
 273 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 274 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 275
 276 /*
 277  * printk
 278  */
 279 #define printk(fmt, args...) fprintf(stderr, fmt, ##args)
 280 #define KERN_CRIT       ""
 281 #define KERN_ERR        ""
 282
 283 /*
 284  * kmalloc/kfree
 285  */
 286 #define kmalloc(x, y) malloc(x)
 287 #define kzalloc(x, y) calloc(1, x)
 288 #define kstrdup(x, y) strdup(x)
 289 #define kfree(x) free(x)
 290 #define vmalloc(x) malloc(x)
 291 #define vfree(x) free(x)
 292
 293 #ifndef BTRFS_DISABLE_BACKTRACE
 294 static inline void assert_trace(const char *assertion, const char *filename,
 295                               const char *func, unsigned line, long val)
 296 {
 297         if (val)
 298                 return;
 299         fprintf(stderr,
 300                 "%s:%d: %s: Assertion `%s` failed, value %ld\n",
 301                 filename, line, func, assertion, val);
 302 #ifndef BTRFS_DISABLE_BACKTRACE
 303         print_trace();
 304 #endif
 305         abort();
 306         exit(1);
 307 }
 308 #define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
 309 #else
 310 #define ASSERT(c) assert(c)
 311 #endif
 312
 313 #define BUG_ON(c) bugon_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
 314 #define BUG() BUG_ON(1)
 315 #define WARN_ON(c) warning_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
 316
 317 #define container_of(ptr, type, member) ({                      \
 318         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
 319                 (type *)( (char *)__mptr - offsetof(type,member) );})
 320 #ifndef __bitwise
 321 #ifdef __CHECKER__
 322 #define __bitwise __bitwise__
 323 #else
 324 #define __bitwise
 325 #endif /* __CHECKER__ */
 326 #endif  /* __bitwise */
 327
 328 /* Alignment check */
 329 #define IS_ALIGNED(x, a)                (((x) & ((typeof(x))(a) - 1)) == 0)
 330
 331 static inline int is_power_of_2(unsigned long n)
 332 {
 333         return (n != 0 && ((n & (n - 1)) == 0));
 334 }
 335
 336 typedef u16 __bitwise __le16;
 337 typedef u16 __bitwise __be16;
 338 typedef u32 __bitwise __le32;
 339 typedef u32 __bitwise __be32;
 340 typedef u64 __bitwise __le64;
 341 typedef u64 __bitwise __be64;
 342
 343 /* Macros to generate set/get funcs for the struct fields
 344  * assume there is a lefoo_to_cpu for every type, so lets make a simple
 345  * one for u8:
 346  */
 347 #define le8_to_cpu(v) (v)
 348 #define cpu_to_le8(v) (v)
 349 #define __le8 u8
 350
 351 #if __BYTE_ORDER == __BIG_ENDIAN
 352 #define cpu_to_le64(x) ((__force __le64)(u64)(bswap_64(x)))
 353 #define le64_to_cpu(x) ((__force u64)(__le64)(bswap_64(x)))
 354 #define cpu_to_le32(x) ((__force __le32)(u32)(bswap_32(x)))
 355 #define le32_to_cpu(x) ((__force u32)(__le32)(bswap_32(x)))
 356 #define cpu_to_le16(x) ((__force __le16)(u16)(bswap_16(x)))
 357 #define le16_to_cpu(x) ((__force u16)(__le16)(bswap_16(x)))
 358 #else
 359 #define cpu_to_le64(x) ((__force __le64)(u64)(x))
 360 #define le64_to_cpu(x) ((__force u64)(__le64)(x))
 361 #define cpu_to_le32(x) ((__force __le32)(u32)(x))
 362 #define le32_to_cpu(x) ((__force u32)(__le32)(x))
 363 #define cpu_to_le16(x) ((__force __le16)(u16)(x))
 364 #define le16_to_cpu(x) ((__force u16)(__le16)(x))
 365 #endif
 366
 367 struct __una_u16 { __le16 x; } __attribute__((__packed__));
 368 struct __una_u32 { __le32 x; } __attribute__((__packed__));
 369 struct __una_u64 { __le64 x; } __attribute__((__packed__));
 370
 371 #define get_unaligned_le8(p) (*((u8 *)(p)))
 372 #define get_unaligned_8(p) (*((u8 *)(p)))
 373 #define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
 374 #define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
 375 #define get_unaligned_le16(p) le16_to_cpu(((const struct __una_u16 *)(p))->x)
 376 #define get_unaligned_16(p) (((const struct __una_u16 *)(p))->x)
 377 #define put_unaligned_le16(val,p) (((struct __una_u16 *)(p))->x = cpu_to_le16(val))
 378 #define put_unaligned_16(val,p) (((struct __una_u16 *)(p))->x = (val))
 379 #define get_unaligned_le32(p) le32_to_cpu(((const struct __una_u32 *)(p))->x)
 380 #define get_unaligned_32(p) (((const struct __una_u32 *)(p))->x)
 381 #define put_unaligned_le32(val,p) (((struct __una_u32 *)(p))->x = cpu_to_le32(val))
 382 #define put_unaligned_32(val,p) (((struct __una_u32 *)(p))->x = (val))
 383 #define get_unaligned_le64(p) le64_to_cpu(((const struct __una_u64 *)(p))->x)
 384 #define get_unaligned_64(p) (((const struct __una_u64 *)(p))->x)
 385 #define put_unaligned_le64(val,p) (((struct __una_u64 *)(p))->x = cpu_to_le64(val))
 386 #define put_unaligned_64(val,p) (((struct __una_u64 *)(p))->x = (val))
 387
 388 #ifndef true
 389 #define true 1
 390 #define false 0
 391 #endif
 392
 393 #ifndef noinline
 394 #define noinline
 395 #endif
 396
 397 #endif