path: root/lib/kobject.c
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authorJeff Mahoney <jeffm@suse.com>2013-11-15 15:33:55 -0500
committerChris Mason <clm@fb.com>2014-01-28 13:19:23 -0800
commit2eaa055fab4e3127c9f572fda1b710cbb2acdf1c (patch)
tree43ec0254e30315288d03196054ff3fff534ed06c /lib/kobject.c
parent9e5ac13acbb9e806a54f131432501bf462248c35 (diff)
btrfs: add ioctls to query/change feature bits online
There are some feature bits that require no offline setup and can be enabled online. I've only reviewed extended irefs, but there will probably be more. We introduce three new ioctls: - BTRFS_IOC_GET_SUPPORTED_FEATURES: query the kernel for supported features. - BTRFS_IOC_GET_FEATURES: query the kernel for enabled features on a per-fs basis, as well as querying for which features are changeable with mounted. - BTRFS_IOC_SET_FEATURES: change features on a per-fs basis. We introduce two new masks per feature set (_SAFE_SET and _SAFE_CLEAR) that allow us to define which features are safe to change at runtime. The failure modes for BTRFS_IOC_SET_FEATURES are as follows: - Enabling a completely unsupported feature: warns and returns -ENOTSUPP - Enabling a feature that can only be done offline: warns and returns -EPERM Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <clm@fb.com>
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