[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/udf/super.c b/fs/udf/super.c
index 2250774..44fe2cb 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -91,7 +91,7 @@
static void udf_open_lvid(struct super_block *);
static void udf_close_lvid(struct super_block *);
static unsigned int udf_count_free(struct super_block *);
-static int udf_statfs(struct super_block *, struct kstatfs *);
+static int udf_statfs(struct dentry *, struct kstatfs *);
/* UDF filesystem type */
static int udf_get_sb(struct file_system_type *fs_type,
@@ -1779,8 +1779,10 @@
* Written, tested, and released.
*/
static int
-udf_statfs(struct super_block *sb, struct kstatfs *buf)
+udf_statfs(struct dentry *dentry, struct kstatfs *buf)
{
+ struct super_block *sb = dentry->d_sb;
+
buf->f_type = UDF_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));