[CRIU] [PATCH 2/4] util: Add is_anon_inode helper

[Cyrill Gorcunov]

Will need it for eventfd, inotify and friends.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 include/util.h |    1 +
 util.c         |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/util.h b/include/util.h
index 60ff126..d526ca8 100644
--- a/include/util.h
+++ b/include/util.h
@@ -276,5 +276,6 @@ static inline dev_t kdev_to_odev(u32 kdev)
 }
 
 int copy_file(int fd_in, int fd_out, size_t bytes);
+bool is_anon_inode(int fd);
 
 #endif /* UTIL_H_ */
diff --git a/util.c b/util.c
index 82b06db..2be5a3f 100644
--- a/util.c
+++ b/util.c
@@ -301,3 +301,18 @@ int copy_file(int fd_in, int fd_out, size_t bytes)
 
 	return 0;
 }
+
+bool is_anon_inode(int fd)
+{
+	struct statfs statfs;
+
+	if (fstatfs(fd, &statfs)) {
+		pr_perror("Can't obtain statfs on fd %d\n", fd);
+		return false;
+	}
+
+	if (statfs.f_type != ANON_INODE_FS_MAGIC)
+		return false;
+
+	return true;
+}
-- 
1.7.7.6