(This is a review patch to seek comments and review, not yet ready for the integration).
The motivation to write this patch is that 'btrfs fi show' shows the stale information after the dev del. So this adds two ioctls to read fsinfo and devinfo from the kernel and report to the user. This is done by providing option -k (which reports only mounted fs and disks) and -K (which reports both mounted/ unmounted-stale fs) from the kernel as shown below. ------ usage: btrfs filesystem show [-k|K] [--all-devices] [<uuid>|<label>] Show the structure of a filesystem If no argument is given, structure of all present filesystems is shown -K list both mounted and unmounted/stale btrfs as per kernel -k list mounted btrfs as known to the kernel. ----- Anand Jain (1): btrfs: add framework to read fs info and dev info from the kernel fs/btrfs/super.c | 87 ++++++++++++++++++++++++++++++++++++++++++---- fs/btrfs/volumes.c | 86 ++++++++++++++++++++++++++++++++++++++++++++- fs/btrfs/volumes.h | 2 ++ include/uapi/linux/btrfs.h | 58 ++++++++++++++++++++++++++++++- 4 files changed, 225 insertions(+), 8 deletions(-) Anand Jain (1): btrfs-progs: add framework to read fs info and dev info from the kernel cmds-filesystem.c | 92 ++++++++++++++++++++++++++++++-- ioctl.h | 60 ++++++++++++++++++++- utils.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ utils.h | 2 + 4 files changed, 303 insertions(+), 4 deletions(-) -- 1.8.1.227.g44fe835 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html