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

1 files changed, 25 insertions, 0 deletions

diff --git a/src/missing.h b/src/missing.h
index 418dbb8c0d..defe885ecc 100644
--- a/src/missing.h
+++ b/src/missing.h
@@ -76,4 +76,29 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
         return syscall(SYS_pivot_root, new_root, put_old);
 }
 
+#ifdef __x86_64__
+#ifndef __NR_fanotify_init
+#define __NR_fanotify_init 300
+#endif
+#ifndef __NR_fanotify_mark
+#define __NR_fanotify_mark 301
+#endif
+#else
+#ifndef __NR_fanotify_init
+#define __NR_fanotify_init 338
+#endif
+#ifndef __NR_fanotify_mark
+#define __NR_fanotify_mark 339
+#endif
+#endif
+
+static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags) {
+	return syscall(__NR_fanotify_init, flags, event_f_flags);
+}
+
+static inline int fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
+                                int dfd, const char *pathname) {
+	return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
+}
+
 #endif