event_notifier: prevent accidental use after close

[mirror_qemu.git] / util / mmap-alloc.c

diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 2f55f5e94f2e0c9a3a4c5b4513bcd8151015a901..3ec029a9eaebccf70da0047693a179e6f9be905d 100644 (file)
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -40,6 +40,31 @@ size_t qemu_fd_getpagesize(int fd)
     return getpagesize();
 }
 
+size_t qemu_mempath_getpagesize(const char *mem_path)
+{
+#ifdef CONFIG_LINUX
+    struct statfs fs;
+    int ret;
+
+    do {
+        ret = statfs(mem_path, &fs);
+    } while (ret != 0 && errno == EINTR);
+
+    if (ret != 0) {
+        fprintf(stderr, "Couldn't statfs() memory path: %s\n",
+                strerror(errno));
+        exit(1);
+    }
+
+    if (fs.f_type == HUGETLBFS_MAGIC) {
+        /* It's hugepage, return the huge page size */
+        return fs.f_bsize;
+    }
+#endif
+
+    return getpagesize();
+}
+
 void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
 {
     /*