iget: stop BFS from using iget() and read_inode()

Stop the BFS filesystem from using iget() and read_inode().  Replace
bfs_read_inode() with bfs_iget(), and call that instead of iget().  bfs_iget()
then uses iget_locked() directly and returns a proper error code instead of an
inode in the event of an error.

bfs_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

[kamalesh@linux.vnet.ibm.com: build fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index 1fd056d..034950c 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -148,10 +148,10 @@
 	if (bh) {
 		unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
 		brelse(bh);
-		inode = iget(dir->i_sb, ino);
-		if (!inode) {
+		inode = bfs_iget(dir->i_sb, ino);
+		if (IS_ERR(inode)) {
 			unlock_kernel();
-			return ERR_PTR(-EACCES);
+			return ERR_CAST(inode);
 		}
 	}
 	unlock_kernel();