From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 26 Aug 2008 11:38:35 -0400
Subject: [fs] introduce a function to register iget failure
Message-id: 1219765117-21681-5-git-send-email-jlayton@redhat.com
O-Subject: [RHEL5.3 PATCH 4/6] BZ#453462: iget: introduce a function to register iget failure
Bugzilla: 453462
RH-Acked-by: David Howells <dhowells@redhat.com>

From: David Howells <dhowells@redhat.com>

Upstream commit b46980feed937868d3333514028bfbe9a651e4ca

Introduce a function to register failure in an inode construction path.  This
includes marking the inode under construction as bad, unlocking it and
releasing it.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 5531694..fbbecd4 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -184,11 +184,19 @@ just takes the superblock and inode number as arguments and does the
 test and set for you.
 
 e.g.
-       inode = iget_locked(sb, ino);
-       if (inode->i_state & I_NEW) {
-               read_inode_from_disk(inode);
-               unlock_new_inode(inode);
-       }
+	inode = iget_locked(sb, ino);
+	if (inode->i_state & I_NEW) {
+		err = read_inode_from_disk(inode);
+		if (err < 0) {
+			iget_failed(inode);
+			return err;
+		}
+		unlock_new_inode(inode);
+	}
+
+Note that if the process of setting up a new inode fails, then iget_failed()
+should be called on the inode to render it dead, and an appropriate error
+should be passed back to the caller.
 
 ---
 [recommended]
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index a139ad0..19218a3 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -381,3 +381,17 @@ int is_bad_inode(struct inode *inode)
 }
 
 EXPORT_SYMBOL(is_bad_inode);
+
+/**
+ * iget_failed - Mark an under-construction inode as dead and release it
+ * @inode: The inode to discard
+ *
+ * Mark an under-construction inode as dead and release it.
+ */
+void iget_failed(struct inode *inode)
+{
+	make_bad_inode(inode);
+	unlock_new_inode(inode);
+	iput(inode);
+}
+EXPORT_SYMBOL(iget_failed);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c3bbf7c..1bac5e8 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1731,6 +1731,7 @@ static inline struct inode *iget(struct super_block *sb, unsigned long ino)
 }
 
 extern void __iget(struct inode * inode);
+extern void iget_failed(struct inode *);
 extern void clear_inode(struct inode *);
 extern void destroy_inode(struct inode *);
 extern struct inode *new_inode(struct super_block *);