[PATCH] libxcmd: fix counting of xfs entries in fs_table_insert

[Christoph Hellwig]

On Sun, Sep 25, 2016 at 06:09:22PM +0800, Eryu Guan wrote:
> Commit bb80e3d6cd04 ("libxcmd: populate fs table with xfs entries
> first, foreign entries last") adds a new counter "xfs_fs_count" and
> increases the counter when inserting an XFS entry.
> 
> But it missed a counter when fs_count is zero (inserting the first
> path) and the entry has no FS_FOREIGN bit set, i.e. the first XFS
> entry doesn't increase xfs_fs_count.
> 
> This results in args_command() mess and infinite loop in xfs/244
> when testing v4 XFS (xfs/244 notrun on v5 XFS, but this bug still
> reproduces on v5 XFS). e.g.
> 
>   mkfs -t xfs -f /dev/sda5
>   mount -o pquota /dev/sda5 /mnt/xfs
>   mkdir /mnt/xfs/project
>   touch /mnt/xfs/project/testfile
>   xfs_quota -x -c "project -s -p /mnt/xfs/project/testfile 1" /dev/sda5
> 
> Fix it by increasing xfs_fs_count when flags has no FS_FOREIGN bit.

Looks ifne,

Reviewed-by: Christoph Hellwig <hch at lst.de>

Can I assume you'll add the above test to xfstests?