Re: [RFC PATCH 0/2] Kernel space btrfs missing device detection.

[Goffredo Baroncelli <kreijack@libero.it>]

Hi,

instead of extending the BTRFS_IOCTL_DEV_INFO ioctl, why do not add a field under /sys/fs/btrfs/<UUID>/ ? Something like /sys/fs/btrfs/<UUID>/missing_device

BR
G.Baroncelli

On 05/06/2014 08:33 AM, Qu Wenruo wrote:
> Original btrfs will not detection any missing device since there is
> no notification mechanism for fs layer to detect missing device in
> block layer.
> 
> However we don't really need to notify fs layer upon dev remove,
> probing in dev_info/rm_dev ioctl is good enough since they are the
> only two ioctls caring about missing device.
> 
> This patchset will do ioctl time missing dev detection and return
> device missing status in dev_info ioctl using a new member in
> btrfs_ioctl_dev_info_args with a backward compatible method.
> 
> Cc: Anand Jain <Anand.Jain@oracle.com> Qu Wenruo (2): btrfs: Add
> missing device check in dev_info/rm_dev ioctl btrfs: Add new member
> of btrfs_ioctl_dev_info_args.
> 
> fs/btrfs/ioctl.c           |  4 ++++ fs/btrfs/volumes.c         | 25
> ++++++++++++++++++++++++- fs/btrfs/volumes.h         |  2 ++ 
> include/uapi/linux/btrfs.h |  5 ++++- 4 files changed, 34
> insertions(+), 2 deletions(-)
> 


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