[patch 52/71] vfs: add __destroy_inode

From: Greg KH
Date: Fri Sep 04 2009 - 20:27:13 EST

2.6.30-stable review patch. If anyone has any objections, please let us know.

From: Christoph Hellwig <hch@xxxxxxxxxxxxx>

backport of upstream commit 2e00c97e2c1d2ffc9e26252ca26b237678b0b772

When we want to tear down an inode that lost the add to the cache race
in XFS we must not call into ->destroy_inode because that would delete
the inode that won the race from the inode cache radix tree.

This patch provides the __destroy_inode helper needed to fix this,
the actual fix will be in th next patch. As XFS was the only reason
destroy_inode was exported we shift the export to the new __destroy_inode.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

fs/inode.c | 10 +++++++---
include/linux/fs.h | 1 +
2 files changed, 8 insertions(+), 3 deletions(-)

--- a/fs/inode.c
+++ b/fs/inode.c
@@ -220,18 +220,22 @@ static struct inode *alloc_inode(struct
return inode;

-void destroy_inode(struct inode *inode)
+void __destroy_inode(struct inode *inode)
+void destroy_inode(struct inode *inode)
+ __destroy_inode(inode);
if (inode->i_sb->s_op->destroy_inode)
kmem_cache_free(inode_cachep, (inode));

* These are initializations that only need to be done
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2162,6 +2162,7 @@ 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 void __destroy_inode(struct inode *);
extern struct inode *new_inode(struct super_block *);
extern int should_remove_suid(struct dentry *);
extern int file_remove_suid(struct file *);

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