Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls

Browse source

This allows us to set a snapshot or a subvolume readonly or writable
on the fly.

Usage:

Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2->flags, and then
call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS);

Changelog for v3:

- Change to pass __u64 as ioctl parameter.

Changelog for v2:

- Add _GETFLAGS ioctl.
- Check if the passed fd is the root of a subvolume.
- Change the name from _SNAP_SETFLAGS to _SUBVOL_SETFLAGS.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

...

This commit is contained in:

Li Zefan 2010-12-20 16:30:25 +08:00

parent b83cc9693f

commit 0caa102da8

2 changed files with 85 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

83

fs/btrfs/ioctl.c

View file

2

fs/btrfs/ioctl.h

View file