[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/reiserfs/super.c b/fs/reiserfs/super.c
index f3ff41d..00f1321 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -60,7 +60,7 @@
}
static int reiserfs_remount(struct super_block *s, int *flags, char *data);
-static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf);
+static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int reiserfs_sync_fs(struct super_block *s, int wait)
{
@@ -1938,15 +1938,15 @@
return errval;
}
-static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf)
+static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
- struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
+ struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
buf->f_bfree = sb_free_blocks(rs);
buf->f_bavail = buf->f_bfree;
buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
- buf->f_bsize = s->s_blocksize;
+ buf->f_bsize = dentry->d_sb->s_blocksize;
/* changed to accommodate gcc folks. */
buf->f_type = REISERFS_SUPER_MAGIC;
return 0;