Btrfs: Faster deletes, add Makefile and kerncompat

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/fs/btrfs/kerncompat.h b/fs/btrfs/kerncompat.h
new file mode 100644
index 000000000000..3a4bb4d661f9
--- /dev/null
+++ b/fs/btrfs/kerncompat.h
@@ -0,0 +1,68 @@
+#ifndef __KERNCOMPAT
+#define __KERNCOMPAT
+#define gfp_t int
+#define get_cpu_var(p) (p)
+#define __get_cpu_var(p) (p)
+#define BITS_PER_LONG 64
+#define __GFP_BITS_SHIFT 20
+#define __GFP_BITS_MASK ((int)((1 << __GFP_BITS_SHIFT) - 1))
+#define __read_mostly
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#define __force
+#define PAGE_SHIFT 12
+#define ULONG_MAX       (~0UL)
+#define BUG() abort()
+
+typedef unsigned int u32;
+typedef unsigned long u64;
+typedef unsigned char u8;
+typedef unsigned short u16;
+
+typedef unsigned long pgoff_t;
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct vma_shared { int prio_tree_node; };
+struct vm_area_struct {
+        unsigned long vm_pgoff;
+        unsigned long vm_start;
+        unsigned long vm_end;
+        struct vma_shared shared;
+};
+
+struct page {
+        unsigned long index;
+};
+
+static inline void preempt_enable(void) { do {; } while(0);}
+static inline void preempt_disable(void) { do {; } while(0);}
+
+static inline void __set_bit(int bit, unsigned long *map) {
+        unsigned long *p = map + bit / BITS_PER_LONG;
+        bit = bit & (BITS_PER_LONG -1);
+        *p |= 1UL << bit;
+}
+
+static inline int test_bit(int bit, unsigned long *map) {
+        unsigned long *p = map + bit / BITS_PER_LONG;
+        bit = bit & (BITS_PER_LONG -1);
+        return *p & (1UL << bit) ? 1 : 0;
+}
+
+static inline void __clear_bit(int bit, unsigned long *map) {
+        unsigned long *p = map + bit / BITS_PER_LONG;
+        bit = bit & (BITS_PER_LONG -1);
+        *p &= ~(1UL << bit);
+}
+#define BUG_ON(c) do { if (c) abort(); } while (0)
+
+#define container_of(ptr, type, member) ({                      \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+                (type *)( (char *)__mptr - __builtin_offsetof(type,member) );})
+
+#endif
+
+#define ENOMEM 5
+#define EEXIST 6