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 #ifndef BTRFS_DISABLE_BACKTRACE
72 #define MAX_BACKTRACE 16
73 static inline void print_trace(void)
75 void *array[MAX_BACKTRACE];
78 size = backtrace(array, MAX_BACKTRACE);
79 backtrace_symbols_fd(array, size, 2);
82 static inline void assert_trace(const char *assertion, const char *filename,
83 const char *func, unsigned line, int val)
88 fprintf(stderr, "%s:%d: %s: Assertion `%s` failed.\n",
89 filename, line, func, assertion);
91 fprintf(stderr, "%s:%d: %s: Assertion failed.\n", filename,
97 #define BUG() assert_trace(NULL, __FILE__, __func__, __LINE__, 0)
99 #define BUG() assert(0)
103 #define __force __attribute__((force))
104 #define __bitwise__ __attribute__((bitwise))
112 * Since we're using primitive definitions from kernel-space, we need to
113 * define __KERNEL__ so that system header files know which definitions
117 #include <asm/types.h>
126 * Continuing to define __KERNEL__ breaks others parts of the code, so
127 * we can just undefine it now that we have the correct headers...
131 typedef unsigned int u32;
132 typedef unsigned int __u32;
133 typedef unsigned long long u64;
134 typedef unsigned char u8;
135 typedef unsigned short u16;
136 typedef long long s64;
141 struct vma_shared { int prio_tree_node; };
142 struct vm_area_struct {
143 unsigned long vm_pgoff;
144 unsigned long vm_start;
145 unsigned long vm_end;
146 struct vma_shared shared;
157 #define mutex_init(m) \
162 static inline void mutex_lock(struct mutex *m)
167 static inline void mutex_unlock(struct mutex *m)
172 static inline int mutex_is_locked(struct mutex *m)
174 return (m->lock != 1);
177 #define cond_resched() do { } while (0)
178 #define preempt_enable() do { } while (0)
179 #define preempt_disable() do { } while (0)
181 #define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
182 #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
184 #ifndef __attribute_const__
185 #define __attribute_const__ __attribute__((__const__))
189 * __set_bit - Set a bit in memory
190 * @nr: the bit to set
191 * @addr: the address to start counting from
193 * Unlike set_bit(), this function is non-atomic and may be reordered.
194 * If it's called on the same region of memory simultaneously, the effect
195 * may be that only one operation succeeds.
197 static inline void __set_bit(int nr, volatile unsigned long *addr)
199 unsigned long mask = BITOP_MASK(nr);
200 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
205 static inline void __clear_bit(int nr, volatile unsigned long *addr)
207 unsigned long mask = BITOP_MASK(nr);
208 unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
214 * test_bit - Determine whether a bit is set
215 * @nr: bit number to test
216 * @addr: Address to start counting from
218 static inline int test_bit(int nr, const volatile unsigned long *addr)
220 return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
226 #define MAX_ERRNO 4095
227 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
229 static inline void *ERR_PTR(long error)
231 return (void *) error;
234 static inline long PTR_ERR(const void *ptr)
239 static inline long IS_ERR(const void *ptr)
241 return IS_ERR_VALUE((unsigned long)ptr);
245 * This looks more complex than it should be. But we need to
246 * get the type for the ~ right in round_down (it needs to be
247 * as wide as the result!), and we want to evaluate the macro
248 * arguments just once each.
250 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
251 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
252 #define round_down(x, y) ((x) & ~__round_mask(x, y))
257 #define printk(fmt, args...) fprintf(stderr, fmt, ##args)
264 #define kmalloc(x, y) malloc(x)
265 #define kzalloc(x, y) calloc(1, x)
266 #define kstrdup(x, y) strdup(x)
267 #define kfree(x) free(x)
268 #define vmalloc(x) malloc(x)
269 #define vfree(x) free(x)
271 #ifndef BTRFS_DISABLE_BACKTRACE
272 #define BUG_ON(c) assert_trace(#c, __FILE__, __func__, __LINE__, !(c))
274 #define BUG_ON(c) assert(!(c))
277 #define WARN_ON(c) BUG_ON(c)
279 #ifndef BTRFS_DISABLE_BACKTRACE
280 #define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (c))
282 #define ASSERT(c) assert(c)
285 #define container_of(ptr, type, member) ({ \
286 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
287 (type *)( (char *)__mptr - offsetof(type,member) );})
289 #define __bitwise __bitwise__
294 /* Alignment check */
295 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
297 static inline int is_power_of_2(unsigned long n)
299 return (n != 0 && ((n & (n - 1)) == 0));
302 typedef u16 __bitwise __le16;
303 typedef u16 __bitwise __be16;
304 typedef u32 __bitwise __le32;
305 typedef u32 __bitwise __be32;
306 typedef u64 __bitwise __le64;
307 typedef u64 __bitwise __be64;
309 /* Macros to generate set/get funcs for the struct fields
310 * assume there is a lefoo_to_cpu for every type, so lets make a simple
313 #define le8_to_cpu(v) (v)
314 #define cpu_to_le8(v) (v)
317 #if __BYTE_ORDER == __BIG_ENDIAN
318 #define cpu_to_le64(x) ((__force __le64)(u64)(bswap_64(x)))
319 #define le64_to_cpu(x) ((__force u64)(__le64)(bswap_64(x)))
320 #define cpu_to_le32(x) ((__force __le32)(u32)(bswap_32(x)))
321 #define le32_to_cpu(x) ((__force u32)(__le32)(bswap_32(x)))
322 #define cpu_to_le16(x) ((__force __le16)(u16)(bswap_16(x)))
323 #define le16_to_cpu(x) ((__force u16)(__le16)(bswap_16(x)))
325 #define cpu_to_le64(x) ((__force __le64)(u64)(x))
326 #define le64_to_cpu(x) ((__force u64)(__le64)(x))
327 #define cpu_to_le32(x) ((__force __le32)(u32)(x))
328 #define le32_to_cpu(x) ((__force u32)(__le32)(x))
329 #define cpu_to_le16(x) ((__force __le16)(u16)(x))
330 #define le16_to_cpu(x) ((__force u16)(__le16)(x))
333 struct __una_u16 { __le16 x; } __attribute__((__packed__));
334 struct __una_u32 { __le32 x; } __attribute__((__packed__));
335 struct __una_u64 { __le64 x; } __attribute__((__packed__));
337 #define get_unaligned_le8(p) (*((u8 *)(p)))
338 #define get_unaligned_8(p) (*((u8 *)(p)))
339 #define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
340 #define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
341 #define get_unaligned_le16(p) le16_to_cpu(((const struct __una_u16 *)(p))->x)
342 #define get_unaligned_16(p) (((const struct __una_u16 *)(p))->x)
343 #define put_unaligned_le16(val,p) (((struct __una_u16 *)(p))->x = cpu_to_le16(val))
344 #define put_unaligned_16(val,p) (((struct __una_u16 *)(p))->x = (val))
345 #define get_unaligned_le32(p) le32_to_cpu(((const struct __una_u32 *)(p))->x)
346 #define get_unaligned_32(p) (((const struct __una_u32 *)(p))->x)
347 #define put_unaligned_le32(val,p) (((struct __una_u32 *)(p))->x = cpu_to_le32(val))
348 #define put_unaligned_32(val,p) (((struct __una_u32 *)(p))->x = (val))
349 #define get_unaligned_le64(p) le64_to_cpu(((const struct __una_u64 *)(p))->x)
350 #define get_unaligned_64(p) (((const struct __una_u64 *)(p))->x)
351 #define put_unaligned_le64(val,p) (((struct __una_u64 *)(p))->x = cpu_to_le64(val))
352 #define put_unaligned_64(val,p) (((struct __una_u64 *)(p))->x = (val))