Move c_src dirs back to toplevel

[bcachefs-tools-debian] / c_src / include / linux / random.h

diff --git a/c_src/include/linux/random.h b/c_src/include/linux/random.h
deleted file mode 100644 (file)
index 3203d13..0000000
--- a/c_src/include/linux/random.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * include/linux/random.h
- *
- * Include file for the random number generator.
- */
-#ifndef _LINUX_RANDOM_H
-#define _LINUX_RANDOM_H
-
-#include <unistd.h>
-#include <sys/syscall.h>
-#include <linux/bug.h>
-#include <linux/log2.h>
-
-#ifdef SYS_getrandom
-static inline int getrandom(void *buf, size_t buflen, unsigned int flags)
-{
-        return syscall(SYS_getrandom, buf, buflen, flags);
-}
-#else
-extern int urandom_fd;
-
-static inline int getrandom(void *buf, size_t buflen, unsigned int flags)
-{
-       return read(urandom_fd, buf, buflen);
-}
-#endif
-
-static inline void get_random_bytes(void *buf, int nbytes)
-{
-       BUG_ON(getrandom(buf, nbytes, 0) != nbytes);
-}
-
-#define get_random_type(type)                          \
-static inline type get_random_##type(void)             \
-{                                                      \
-       type v;                                         \
-                                                       \
-       get_random_bytes(&v, sizeof(v));                \
-       return v;                                       \
-}
-
-get_random_type(int);
-get_random_type(long);
-get_random_type(u8);
-get_random_type(u16);
-get_random_type(u32);
-get_random_type(u64);
-
-static inline u32 get_random_u32_below(u32 ceil)
-{
-       if (ceil <= 1)
-               return 0;
-       for (;;) {
-               if (ceil <= 1U << 8) {
-                       u32 mult = ceil * get_random_u8();
-                       if (likely(is_power_of_2(ceil) || (u8)mult >= (1U << 8) % ceil))
-                               return mult >> 8;
-               } else if (ceil <= 1U << 16) {
-                       u32 mult = ceil * get_random_u16();
-                       if (likely(is_power_of_2(ceil) || (u16)mult >= (1U << 16) % ceil))
-                               return mult >> 16;
-               } else {
-                       u64 mult = (u64)ceil * get_random_u32();
-                       if (likely(is_power_of_2(ceil) || (u32)mult >= -ceil % ceil))
-                               return mult >> 32;
-               }
-       }
-}
-
-#endif /* _LINUX_RANDOM_H */