[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/compat.c b/fs/compat.c
index b1f6478..7e7e5bc 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -197,7 +197,7 @@
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
- error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs(nd.dentry, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
path_release(&nd);
@@ -215,7 +215,7 @@
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs(file->f_dentry, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
fput(file);
@@ -265,7 +265,7 @@
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
- error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs(nd.dentry, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
path_release(&nd);
@@ -286,7 +286,7 @@
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs(file->f_dentry, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
fput(file);