Re: [PATCH 5/5] xfs_repair: trash dirattr btrees that cycle to the root

[Eric Sandeen <sandeen@sandeen.net>]

On 1/20/17 2:25 PM, Darrick J. Wong wrote:
> If xfs_repair detects a dir/attr btree that cycles back to the root, the
> tree should be cleared and/or rebuilt instead of simply aborting the
> repair program.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

So, while this seems ok, so:

Reviewed-by: Eric Sandeen <sandeen@redhat.com>

you can take this or leave it:

It'd be a bit nicer to just test da_bno outside the loop, I think;
the whole loop is

	do {
....
        } while (da_bno != 0);

so the only way da_bno can be zero here is if we entered the loop this way
after:

        da_bno = da_cursor->level[0].bno;

prior to entering it the first time:

        ino = da_cursor->ino;
        prev_bno = 0;

        do {
 
-Eric

> ---
>  repair/attr_repair.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> 
> diff --git a/repair/attr_repair.c b/repair/attr_repair.c
> index b855a10..37a821b 100644
> --- a/repair/attr_repair.c
> +++ b/repair/attr_repair.c
> @@ -763,7 +763,12 @@ process_leaf_attr_level(xfs_mount_t	*mp,
>  		 * 0 is the root block and no block
>  		 * pointer can point to the root block of the btree
>  		 */
> -		ASSERT(da_bno != 0);
> +		if (da_bno == 0) {
> +			do_warn(
> +	_("btree cycle detected in attribute fork for inode %" PRIu64 "\n"),
> +				ino);
> +			goto error_out;
> +		}
>  
>  		if (dev_bno == NULLFSBLOCK) {
>  			do_warn(
> 
> --
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