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Re: any way to work backwards from xfs_inode_t to a filename?

To: Ben Myers <bpm@xxxxxxx>
Subject: Re: any way to work backwards from xfs_inode_t to a filename?
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Wed, 15 May 2013 17:19:52 -0500
Cc: Chris Friesen <chris.friesen@xxxxxxxxxxx>, Alex Elder <elder@xxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130515221000.GX812@xxxxxxx>
References: <5194050B.7010401@xxxxxxxxxxx> <20130515221000.GX812@xxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130328 Thunderbird/17.0.5
On 5/15/13 5:10 PM, Ben Myers wrote:
> Hey Chris,
> 
> On Wed, May 15, 2013 at 03:58:35PM -0600, Chris Friesen wrote:
>> As I mentioned before I'm digging into some intermittent xfs
>> corruption issues on an embedded system running a 2.6.27-based
>> kernel.
>>
>> In one case I've hit XFS_WANT_CORRUPTED_GOTO in
>> xfs_free_ag_extent(). In this particular case the call chain was
>>
>> xfs_free_ag_extent+0x55d/0x6e0
>> xfs_free_extent+0xac/0xd0
>> xfs_bmap_finish+0x156/0x1a0
>> xfs_itruncate_finish+0x137/0x340
>> xfs_inactive+0x386/0x4b0
>> xfs_fs_clear_inode+0xc6/0x120
>> clear_inode+0x58/0x110
>> generic_delete_inode+0xff/0x110
>> generic_drop_inode+0x16d/0x190
>> iput+0x5d/0x70
>> do_unlinkat+0x147/0x280
>> sys_unlinkat+0x1d/0x40
>>
>> I have two questions:
>>
>> 1) do_unlinkat() has the filesystem path, but iput() returns void.
>> Is there any way for me to add instrumentation to xfs_inactive() to
>> work backwards from the xfs_inode_t pointer to print out a path to
>> the file being deleted?
> 
> Use VFS_I to get to a 'struct inode' and from there you can look at the
> dentries on i_dentry list and traverse back through the path by looking at
> d_parent.  Might be easier to just print the path in do_unlinkat?

or just print out the inode nr (i_ino) and do a find -inum after the fact.  :)

-Eric </lazy>

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