Btrfs progs v4.17.1
[btrfs-progs-unstable/devel.git] / kerncompat.h
blobfa96715fb70cef75e8c95603f5034a39d57a268e
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __KERNCOMPAT_H__
20 #define __KERNCOMPAT_H__
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>
33 #include <features.h>
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
42 #ifndef BTRFS_DISABLE_BACKTRACE
43 #include <execinfo.h>
44 #endif
46 #define ptr_to_u64(x) ((u64)(uintptr_t)x)
47 #define u64_to_ptr(x) ((void *)(uintptr_t)x)
49 #ifndef READ
50 #define READ 0
51 #define WRITE 1
52 #define READA 2
53 #endif
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]))
67 #ifndef ULONG_MAX
68 #define ULONG_MAX (~0UL)
69 #endif
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
79 #ifndef BTRFS_DISABLE_BACKTRACE
80 #define MAX_BACKTRACE 16
81 static inline void print_trace(void)
83 void *array[MAX_BACKTRACE];
84 int size;
86 size = backtrace(array, MAX_BACKTRACE);
87 backtrace_symbols_fd(array, size, 2);
89 #endif
91 static inline void warning_trace(const char *assertion, const char *filename,
92 const char *func, unsigned line, long val)
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
104 static inline void bugon_trace(const char *assertion, const char *filename,
105 const char *func, unsigned line, long val)
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);
119 #ifdef __CHECKER__
120 #define __force __attribute__((force))
121 #define __bitwise__ __attribute__((bitwise))
122 #else
123 #define __force
124 #define __bitwise__
125 #endif
127 #ifndef __CHECKER__
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.
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;
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...
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
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;
166 struct page {
167 unsigned long index;
170 struct mutex {
171 unsigned long lock;
174 #define mutex_init(m) \
175 do { \
176 (m)->lock = 1; \
177 } while (0)
179 static inline void mutex_lock(struct mutex *m)
181 m->lock--;
184 static inline void mutex_unlock(struct mutex *m)
186 m->lock++;
189 static inline int mutex_is_locked(struct mutex *m)
191 return (m->lock != 1);
194 #define cond_resched() do { } while (0)
195 #define preempt_enable() do { } while (0)
196 #define preempt_disable() do { } while (0)
198 #define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
199 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
201 #ifndef __attribute_const__
202 #define __attribute_const__ __attribute__((__const__))
203 #endif
206 * __set_bit - Set a bit in memory
207 * @nr: the bit to set
208 * @addr: the address to start counting from
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.
214 static inline void __set_bit(int nr, volatile unsigned long *addr)
216 unsigned long mask = BITOP_MASK(nr);
217 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
219 *p |= mask;
222 static inline void __clear_bit(int nr, volatile unsigned long *addr)
224 unsigned long mask = BITOP_MASK(nr);
225 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
227 *p &= ~mask;
231 * test_bit - Determine whether a bit is set
232 * @nr: bit number to test
233 * @addr: Address to start counting from
235 static inline int test_bit(int nr, const volatile unsigned long *addr)
237 return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
241 * error pointer
243 #define MAX_ERRNO 4095
244 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
246 static inline void *ERR_PTR(long error)
248 return (void *) error;
251 static inline long PTR_ERR(const void *ptr)
253 return (long) ptr;
256 static inline int IS_ERR(const void *ptr)
258 return IS_ERR_VALUE((unsigned long)ptr);
261 static inline int IS_ERR_OR_NULL(const void *ptr)
263 return !ptr || IS_ERR(ptr);
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.
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))
277 * printk
279 #define printk(fmt, args...) fprintf(stderr, fmt, ##args)
280 #define KERN_CRIT ""
281 #define KERN_ERR ""
284 * kmalloc/kfree
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)
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)
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);
308 #define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
309 #else
310 #define ASSERT(c) assert(c)
311 #endif
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))
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 */
328 /* Alignment check */
329 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
331 static inline int is_power_of_2(unsigned long n)
333 return (n != 0 && ((n & (n - 1)) == 0));
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;
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:
347 #define le8_to_cpu(v) (v)
348 #define cpu_to_le8(v) (v)
349 #define __le8 u8
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
367 struct __una_u16 { __le16 x; } __attribute__((__packed__));
368 struct __una_u32 { __le32 x; } __attribute__((__packed__));
369 struct __una_u64 { __le64 x; } __attribute__((__packed__));
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))
388 #ifndef true
389 #define true 1
390 #define false 0
391 #endif
393 #ifndef noinline
394 #define noinline
395 #endif
397 #endif