[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
Give the statfs superblock operation a dentry pointer rather than a superblock
pointer.
This complements the get_sb() patch. That reduced the significance of
sb->s_root, allowing NFS to place a fake root there. However, NFS does
require a dentry to use as a target for the statfs operation. This permits
the root in the vfsmount to be used instead.
linux/mount.h has been added where necessary to make allyesconfig build
successfully.
Interest has also been expressed for use with the FUSE and XFS filesystems.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c
index d76eeaa..b74b791 100644
--- a/fs/freevxfs/vxfs_super.c
+++ b/fs/freevxfs/vxfs_super.c
@@ -40,6 +40,7 @@
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/vfs.h>
+#include <linux/mount.h>
#include "vxfs.h"
#include "vxfs_extern.h"
@@ -55,7 +56,7 @@
static void vxfs_put_super(struct super_block *);
-static int vxfs_statfs(struct super_block *, struct kstatfs *);
+static int vxfs_statfs(struct dentry *, struct kstatfs *);
static int vxfs_remount(struct super_block *, int *, char *);
static struct super_operations vxfs_super_ops = {
@@ -90,12 +91,12 @@
/**
* vxfs_statfs - get filesystem information
- * @sbp: VFS superblock
+ * @dentry: VFS dentry to locate superblock
* @bufp: output buffer
*
* Description:
* vxfs_statfs fills the statfs buffer @bufp with information
- * about the filesystem described by @sbp.
+ * about the filesystem described by @dentry.
*
* Returns:
* Zero.
@@ -107,12 +108,12 @@
* This is everything but complete...
*/
static int
-vxfs_statfs(struct super_block *sbp, struct kstatfs *bufp)
+vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
{
- struct vxfs_sb_info *infp = VXFS_SBI(sbp);
+ struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
bufp->f_type = VXFS_SUPER_MAGIC;
- bufp->f_bsize = sbp->s_blocksize;
+ bufp->f_bsize = dentry->d_sb->s_blocksize;
bufp->f_blocks = infp->vsi_raw->vs_dsize;
bufp->f_bfree = infp->vsi_raw->vs_free;
bufp->f_bavail = 0;