readahead: implement minimal readahead logic based on fanotify(), mincore() and readahead()

1 files changed, 6 insertions, 0 deletions

diff --git a/src/macro.h b/src/macro.h
index 44b481775d..12ccbb1513 100644
--- a/src/macro.h
+++ b/src/macro.h
@@ -27,6 +27,8 @@
 #include <sys/uio.h>
 #include <inttypes.h>
 
+#define PAGE_SIZE 4096
+
 #define _printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
 #define _sentinel_ __attribute__ ((sentinel))
 #define _noreturn_ __attribute__((noreturn))
@@ -49,6 +51,10 @@ static inline size_t ALIGN(size_t l) {
         return ((l + sizeof(void*) - 1) & ~(sizeof(void*) - 1));
 }
 
+static inline size_t PAGE_ALIGN(size_t l) {
+        return ((l + PAGE_SIZE - 1) & ~(PAGE_SIZE -1));
+}
+
 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
 
 #define MAX(a,b)                                \