files: Don't call fstatfs twice

When filling fd_parms we do call statfs, no need to call it
again later.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

files.c

@@ -294,11 +294,14 @@ static int dump_chrdev(struct fd_parms *p, int lfd, const int fdinfo)
 #define PIPEFS_MAGIC	0x50495045
 #endif
 
+#ifndef ANON_INODE_FS_MAGIC
+# define ANON_INODE_FS_MAGIC 0x09041934
+#endif
+
 static int dump_one_file(struct parasite_ctl *ctl, int fd, int lfd, struct fd_opts *opts,
 		       const int fdinfo)
 {
 	struct fd_parms p = FD_PARMS_INIT;
-	struct statfs statfs;
 	const struct fdtype_ops *ops;
 
 	if (fill_fd_params(ctl, fd, lfd, opts, &p) < 0) {
@@ -312,12 +315,7 @@ static int dump_one_file(struct parasite_ctl *ctl, int fd, int lfd, struct fd_op
 	if (S_ISCHR(p.stat.st_mode))
 		return dump_chrdev(&p, lfd, fdinfo);
 
-	if (fstatfs(lfd, &statfs)) {
-		pr_perror("Can't obtain statfs on fd %d", fd);
-		return -1;
-	}
-
-	if (is_anon_inode(&statfs)) {
+	if (p.fs_type == ANON_INODE_FS_MAGIC) {
 		if (is_eventfd_link(lfd))
 			ops = &eventfd_dump_ops;
 		else if (is_eventpoll_link(lfd))
@@ -357,7 +355,7 @@ static int dump_one_file(struct parasite_ctl *ctl, int fd, int lfd, struct fd_op
 	}
 
 	if (S_ISFIFO(p.stat.st_mode)) {
-		if (statfs.f_type == PIPEFS_MAGIC)
+		if (p.fs_type == PIPEFS_MAGIC)
 			ops = &pipe_dump_ops;
 		else
 			ops = &fifo_dump_ops;

include/util.h

@@ -234,7 +234,6 @@ static inline dev_t kdev_to_odev(u32 kdev)
 }
 
 extern int copy_file(int fd_in, int fd_out, size_t bytes);
-extern bool is_anon_inode(struct statfs *statfs);
 extern int is_anon_link_type(int lfd, char *type);
 
 #define is_hex_digit(c)				\

util.c

@@ -404,15 +404,6 @@ int copy_file(int fd_in, int fd_out, size_t bytes)
 	return 0;
 }
 
-#ifndef ANON_INODE_FS_MAGIC
-# define ANON_INODE_FS_MAGIC 0x09041934
-#endif
-
-bool is_anon_inode(struct statfs *statfs)
-{
-	return statfs->f_type == ANON_INODE_FS_MAGIC;
-}
-
 int read_fd_link(int lfd, char *buf, size_t size)
 {
 	char t[32];