hostfs: support rename flags
Support RENAME_NOREPLACE and RENAME_EXCHANGE flags on hostfs if the
underlying filesystem supports it.
Since renameat2(2) is not yet in any libc, use syscall(2) to invoke the
renameat2 syscall.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
index 67838f3..9765dab 100644
--- a/fs/hostfs/hostfs_user.c
+++ b/fs/hostfs/hostfs_user.c
@@ -14,6 +14,7 @@
#include <sys/time.h>
#include <sys/types.h>
#include <sys/vfs.h>
+#include <sys/syscall.h>
#include "hostfs.h"
#include <utime.h>
@@ -360,6 +361,33 @@
return 0;
}
+int rename2_file(char *from, char *to, unsigned int flags)
+{
+ int err;
+
+#ifndef SYS_renameat2
+# ifdef __x86_64__
+# define SYS_renameat2 316
+# endif
+# ifdef __i386__
+# define SYS_renameat2 353
+# endif
+#endif
+
+#ifdef SYS_renameat2
+ err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
+ if (err < 0) {
+ if (errno != ENOSYS)
+ return -errno;
+ else
+ return -EINVAL;
+ }
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
int do_statfs(char *root, long *bsize_out, long long *blocks_out,
long long *bfree_out, long long *bavail_out,
long long *files_out, long long *ffree_out,