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__
30 #include <linux/types.h>
36 #ifndef BTRFS_DISABLE_BACKTRACE
37 #define BTRFS_DISABLE_BACKTRACE
39 #define __always_inline __inline __attribute__ ((__always_inline__))
42 #ifndef BTRFS_DISABLE_BACKTRACE
46 #define ptr_to_u64(x) ((u64)(uintptr_t)x)
47 #define u64_to_ptr(x) ((void *)(uintptr_t)x)
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))
65 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
68 #define ULONG_MAX (~0UL)
71 #define __token_glue(a,b,c) ___token_glue(a,b,c)
72 #define ___token_glue(a,b,c) a ## b ## c
73 #define BUILD_ASSERT(x) extern int __token_glue(compile_time_assert_,__LINE__,__COUNTER__)[1-2*!(x)] __attribute__((unused))
75 #ifndef BTRFS_DISABLE_BACKTRACE
76 #define MAX_BACKTRACE 16
77 static inline void print_trace(void)
79 void *array[MAX_BACKTRACE];
82 size = backtrace(array, MAX_BACKTRACE);
83 backtrace_symbols_fd(array, size, 2);
86 static inline void assert_trace(const char *assertion, const char *filename,
87 const char *func, unsigned line, int val)
92 fprintf(stderr, "%s:%d: %s: Assertion `%s` failed, value %d\n",
93 filename, line, func, assertion, val);
95 fprintf(stderr, "%s:%d: %s: Assertion failed, value %d.\n",
96 filename, line, func, val);
102 static inline void warning_trace(const char *assertion, const char *filename,
103 const char *func, unsigned line, int val,
110 "%s:%d: %s: Warning: assertion `%s` failed, value %d\n",
111 filename, line, func, assertion, val);
114 "%s:%d: %s: Warning: assertion failed, value %d.\n",
115 filename, line, func, val);
120 #define BUG() assert_trace(NULL, __FILE__, __func__, __LINE__, 0)
122 #define BUG() assert(0)
126 #define __force __attribute__((force))
127 #define __bitwise__ __attribute__((bitwise))
135 * Since we're using primitive definitions from kernel-space, we need to
136 * define __KERNEL__ so that system header files know which definitions
140 #include <asm/types.h>
149 * Continuing to define __KERNEL__ breaks others parts of the code, so
150 * we can just undefine it now that we have the correct headers...
154 typedef unsigned int u32;
155 typedef unsigned int __u32;
156 typedef unsigned long long u64;
157 typedef unsigned char u8;
158 typedef unsigned short u16;
159 typedef long long s64;
164 struct vma_shared { int prio_tree_node; };
165 struct vm_area_struct {
166 unsigned long vm_pgoff;
167 unsigned long vm_start;
168 unsigned long vm_end;
169 struct vma_shared shared;
180 #define mutex_init(m) \
185 static inline void mutex_lock(struct mutex *m)
190 static inline void mutex_unlock(struct mutex *m)
195 static inline int mutex_is_locked(struct mutex *m)
197 return (m->lock != 1);
200 #define cond_resched() do { } while (0)
201 #define preempt_enable() do { } while (0)
202 #define preempt_disable() do { } while (0)
204 #define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
205 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
207 #ifndef __attribute_const__
208 #define __attribute_const__ __attribute__((__const__))
212 * __set_bit - Set a bit in memory
213 * @nr: the bit to set
214 * @addr: the address to start counting from
216 * Unlike set_bit(), this function is non-atomic and may be reordered.
217 * If it's called on the same region of memory simultaneously, the effect
218 * may be that only one operation succeeds.
220 static inline void __set_bit(int nr, volatile unsigned long *addr)
222 unsigned long mask = BITOP_MASK(nr);
223 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
228 static inline void __clear_bit(int nr, volatile unsigned long *addr)
230 unsigned long mask = BITOP_MASK(nr);
231 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
237 * test_bit - Determine whether a bit is set
238 * @nr: bit number to test
239 * @addr: Address to start counting from
241 static inline int test_bit(int nr, const volatile unsigned long *addr)
243 return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
249 #define MAX_ERRNO 4095
250 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
252 static inline void *ERR_PTR(long error)
254 return (void *) error;
257 static inline long PTR_ERR(const void *ptr)
262 static inline long IS_ERR(const void *ptr)
264 return IS_ERR_VALUE((unsigned long)ptr);
268 * This looks more complex than it should be. But we need to
269 * get the type for the ~ right in round_down (it needs to be
270 * as wide as the result!), and we want to evaluate the macro
271 * arguments just once each.
273 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
274 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
275 #define round_down(x, y) ((x) & ~__round_mask(x, y))
280 #define printk(fmt, args...) fprintf(stderr, fmt, ##args)
287 #define kmalloc(x, y) malloc(x)
288 #define kzalloc(x, y) calloc(1, x)
289 #define kstrdup(x, y) strdup(x)
290 #define kfree(x) free(x)
291 #define vmalloc(x) malloc(x)
292 #define vfree(x) free(x)
294 #ifndef BTRFS_DISABLE_BACKTRACE
295 #define BUG_ON(c) assert_trace(#c, __FILE__, __func__, __LINE__, !(c))
296 #define WARN_ON(c) warning_trace(#c, __FILE__, __func__, __LINE__, !(c), 1)
298 #define BUG_ON(c) assert(!(c))
299 #define WARN_ON(c) warning_trace(#c, __FILE__, __func__, __LINE__, !(c), 0)
302 #ifndef BTRFS_DISABLE_BACKTRACE
303 #define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (c))
305 #define ASSERT(c) assert(c)
308 #define container_of(ptr, type, member) ({ \
309 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
310 (type *)( (char *)__mptr - offsetof(type,member) );})
312 #define __bitwise __bitwise__
317 /* Alignment check */
318 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
320 static inline int is_power_of_2(unsigned long n)
322 return (n != 0 && ((n & (n - 1)) == 0));
325 typedef u16 __bitwise __le16;
326 typedef u16 __bitwise __be16;
327 typedef u32 __bitwise __le32;
328 typedef u32 __bitwise __be32;
329 typedef u64 __bitwise __le64;
330 typedef u64 __bitwise __be64;
332 /* Macros to generate set/get funcs for the struct fields
333 * assume there is a lefoo_to_cpu for every type, so lets make a simple
336 #define le8_to_cpu(v) (v)
337 #define cpu_to_le8(v) (v)
340 #if __BYTE_ORDER == __BIG_ENDIAN
341 #define cpu_to_le64(x) ((__force __le64)(u64)(bswap_64(x)))
342 #define le64_to_cpu(x) ((__force u64)(__le64)(bswap_64(x)))
343 #define cpu_to_le32(x) ((__force __le32)(u32)(bswap_32(x)))
344 #define le32_to_cpu(x) ((__force u32)(__le32)(bswap_32(x)))
345 #define cpu_to_le16(x) ((__force __le16)(u16)(bswap_16(x)))
346 #define le16_to_cpu(x) ((__force u16)(__le16)(bswap_16(x)))
348 #define cpu_to_le64(x) ((__force __le64)(u64)(x))
349 #define le64_to_cpu(x) ((__force u64)(__le64)(x))
350 #define cpu_to_le32(x) ((__force __le32)(u32)(x))
351 #define le32_to_cpu(x) ((__force u32)(__le32)(x))
352 #define cpu_to_le16(x) ((__force __le16)(u16)(x))
353 #define le16_to_cpu(x) ((__force u16)(__le16)(x))
356 struct __una_u16 { __le16 x; } __attribute__((__packed__));
357 struct __una_u32 { __le32 x; } __attribute__((__packed__));
358 struct __una_u64 { __le64 x; } __attribute__((__packed__));
360 #define get_unaligned_le8(p) (*((u8 *)(p)))
361 #define get_unaligned_8(p) (*((u8 *)(p)))
362 #define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
363 #define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
364 #define get_unaligned_le16(p) le16_to_cpu(((const struct __una_u16 *)(p))->x)
365 #define get_unaligned_16(p) (((const struct __una_u16 *)(p))->x)
366 #define put_unaligned_le16(val,p) (((struct __una_u16 *)(p))->x = cpu_to_le16(val))
367 #define put_unaligned_16(val,p) (((struct __una_u16 *)(p))->x = (val))
368 #define get_unaligned_le32(p) le32_to_cpu(((const struct __una_u32 *)(p))->x)
369 #define get_unaligned_32(p) (((const struct __una_u32 *)(p))->x)
370 #define put_unaligned_le32(val,p) (((struct __una_u32 *)(p))->x = cpu_to_le32(val))
371 #define put_unaligned_32(val,p) (((struct __una_u32 *)(p))->x = (val))
372 #define get_unaligned_le64(p) le64_to_cpu(((const struct __una_u64 *)(p))->x)
373 #define get_unaligned_64(p) (((const struct __una_u64 *)(p))->x)
374 #define put_unaligned_le64(val,p) (((struct __una_u64 *)(p))->x = cpu_to_le64(val))
375 #define put_unaligned_64(val,p) (((struct __una_u64 *)(p))->x = (val))