cramfs: fix named-pipe handling

After commit a97c9bf3 (fix cramfs
making duplicate entries in inode cache) in kernel 2.6.14, named-pipe
on cramfs does not work properly.

It seems the commit make all named-pipe on cramfs share their inode
(and named-pipe buffer).

Make ..._test() refuse to merge inodes with ->i_ino == 1, take inode setup
back to get_cramfs_inode() and make ->drop_inode() evict ones with ->i_ino
== 1 immediately.
Reported-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>		[2.6.14 and later]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/cramfs/inode.c

@@ -43,31 +43,25 @@ static DEFINE_MUTEX(read_mutex);
 static int cramfs_iget5_test(struct inode *inode, void *opaque)
 {
 	struct cramfs_inode *cramfs_inode = opaque;
-
-	if (inode->i_ino != CRAMINO(cramfs_inode))
-		return 0; /* does not match */
-
-	if (inode->i_ino != 1)
-		return 1;
-
-	/* all empty directories, char, block, pipe, and sock, share inode #1 */
-
-	if ((inode->i_mode != cramfs_inode->mode) ||
-	    (inode->i_gid != cramfs_inode->gid) ||
-	    (inode->i_uid != cramfs_inode->uid))
-		return 0; /* does not match */
-
-	if ((S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) &&
-	    (inode->i_rdev != old_decode_dev(cramfs_inode->size)))
-		return 0; /* does not match */
-
-	return 1; /* matches */
+	return inode->i_ino == CRAMINO(cramfs_inode) && inode->i_ino != 1;
 }
 
 static int cramfs_iget5_set(struct inode *inode, void *opaque)
 {
-	static struct timespec zerotime;
 	struct cramfs_inode *cramfs_inode = opaque;
+	inode->i_ino = CRAMINO(cramfs_inode);
+	return 0;
+}
+
+static struct inode *get_cramfs_inode(struct super_block *sb,
+				struct cramfs_inode * cramfs_inode)
+{
+	struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),
+					    cramfs_iget5_test, cramfs_iget5_set,
+					    cramfs_inode);
+	static struct timespec zerotime;
+
+	if (inode && (inode->i_state & I_NEW)) {
 		inode->i_mode = cramfs_inode->mode;
 		inode->i_uid = cramfs_inode->uid;
 		inode->i_size = cramfs_inode->size;
@@ -75,7 +69,6 @@ static int cramfs_iget5_set(struct inode *inode, void *opaque)
 		inode->i_gid = cramfs_inode->gid;
 		/* Struct copy intentional */
 		inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime;
-	inode->i_ino = CRAMINO(cramfs_inode);
 		/* inode->i_nlink is left 1 - arguably wrong for directories,
 		   but it's the best we can do without reading the directory
 		   contents.  1 yields the right result in GNU find, even
@@ -95,21 +88,19 @@ static int cramfs_iget5_set(struct inode *inode, void *opaque)
 			init_special_inode(inode, inode->i_mode,
 				old_decode_dev(cramfs_inode->size));
 		}
-	return 0;
-}
-
-static struct inode *get_cramfs_inode(struct super_block *sb,
-				struct cramfs_inode * cramfs_inode)
-{
-	struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),
-					    cramfs_iget5_test, cramfs_iget5_set,
-					    cramfs_inode);
-	if (inode && (inode->i_state & I_NEW)) {
 		unlock_new_inode(inode);
 	}
 	return inode;
 }
 
+static void cramfs_drop_inode(struct inode *inode)
+{
+	if (inode->i_ino == 1)
+		generic_delete_inode(inode);
+	else
+		generic_drop_inode(inode);
+}
+
 /*
  * We have our own block cache: don't fill up the buffer cache
  * with the rom-image, because the way the filesystem is set
@@ -534,6 +525,7 @@ static const struct super_operations cramfs_ops = {
 	.put_super	= cramfs_put_super,
 	.remount_fs	= cramfs_remount,
 	.statfs		= cramfs_statfs,
+	.drop_inode	= cramfs_drop_inode,
 };
 
 static int cramfs_get_sb(struct file_system_type *fs_type,