[PATCH] Add system calls statfs64 and fstatfs64

From: Peter Chubb <peter@chubb.wattle.id.au>

Add two new system calls, statfs64 and fstatfs64.  This has been needed
sincew the 64-bit sector_t merge - the current structures will overflow.

- Use a common interface (vfs_statfs) with the rest of the kernel,

- convert to 32-bit at (f)statfs time.

- New field f_frsize gives underlying fragment size for the filesystem.
  (Solaris has this, and the Open Group describe it).

- The old statfs syscalls will now return -EOVERFLOW if the device was
  too large to be represented inthe old data structures.

The new system calls take a size_t argument, which is the size of the
structure to be filled in (as requested by Ben LaHaise), to `futureproof' the
interface.

Has been reviewed by the arch maintainers and by Ulrich Drepper.

1 files changed, 37 insertions, 0 deletions

diff --git a/include/asm-generic/statfs.h b/include/asm-generic/statfs.h
new file mode 100644
index 000000000000..fecaf8fd5c10
--- /dev/null
+++ b/include/asm-generic/statfs.h
@@ -0,0 +1,37 @@
+#ifndef _GENERIC_STATFS_H
+#define _GENERIC_STATFS_H
+
+#ifndef __KERNEL_STRICT_NAMES
+# include <linux/types.h>
+typedef __kernel_fsid_t	fsid_t;
+#endif
+
+struct statfs {
+	__u32 f_type;
+	__u32 f_bsize;
+	__u32 f_blocks;
+	__u32 f_bfree;
+	__u32 f_bavail;
+	__u32 f_files;
+	__u32 f_ffree;
+	__kernel_fsid_t f_fsid;
+	__u32 f_namelen;
+	__u32 f_frsize;
+	__u32 f_spare[5];
+};
+
+struct statfs64 {
+	__u32 f_type;
+	__u32 f_bsize;
+	__u64 f_blocks;
+	__u64 f_bfree;
+	__u64 f_bavail;
+	__u64 f_files;
+	__u64 f_ffree;
+	__kernel_fsid_t f_fsid;
+	__u32 f_namelen;
+	__u32 f_frsize;
+	__u32 f_spare[5];
+};
+
+#endif