linux-kernel - Re: [PATCH]: initialize parts of udf inode earlier in create

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Date:	Mon, 07 Aug 2006 00:14:20 -0700
From:	dan@...enterprises.com
To:	"Eric Sandeen" <sandeen@...deen.net>, linux-kernel@...r.kernel.org
Cc:	bfennema@...con.csc.calpoly.edu
Subject: Re: [PATCH]: initialize parts of udf inode earlier in create

> I saw an oops down this path when trying to create a new file on a UDF 
> filesystem which was internally marked as readonly, but mounted rw:
> 
> udf_create
>         udf_new_inode
>                 new_inode
>                         alloc_inode
>                         	udf_alloc_inode
>                 udf_new_block
>                         returns EIO due to readonlyness
>                 iput (on error)

I ran into the same issue today, but when listing a directory with
invalid/corrupt entries:

udf_lookup
        udf_iget
                get_new_inode_fast
                        alloc_inode
                                udf_alloc_inode
                __udf_read_inode
                        fails for any reason
                iput (on error)
                        ...

The following patch to udf_alloc_inode() should take care of both (and
other similar) cases, but I've only tested it with udf_lookup().

Dan

--

Signed-off-by: Dan Bastone <dan@...enterprises.com>

--- linux-2.6.17.7/fs/udf/super.c.orig
+++ linux-2.6.17.7/fs/udf/super.c
@@ -116,6 +116,13 @@
        ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep,
        SLAB_KERNEL);
        if (!ei)
                return NULL;
+
+       ei->i_unique = 0;
+       ei->i_lenExtents = 0;
+       ei->i_next_alloc_block = 0;
+       ei->i_next_alloc_goal = 0;
+       ei->i_strat4096 = 0;
+
        return &ei->vfs_inode;
 }


-- 
  
  diegogarcia@...email.com

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