From mboxrd@z Thu Jan 1 00:00:00 1970 From: Li Zefan Subject: [PATCH 0/5] btrfs: Readonly snapshots Date: Mon, 29 Nov 2010 16:02:31 +0800 Message-ID: <4CF35E17.6050705@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: Sage Weil To: linux-btrfs@vger.kernel.org Return-path: List-ID: (Cc: Sage Weil for changes in async snapshots) This patchset adds readonly-snapshots support. You can create a readonly snapshot, and you can also set a snapshot readonly/writable on the fly. A few readonly checks are added in setattr, permission, remove_xattr and set_xattr callbacks, as well as in some ioctls. You can also try it out by pulling (based on the master branch of Chris' tree): git://repo.or.cz/linux-btrfs-devel.git readonly-snapshots Note: I changed the async snapshot ABI. So if the patchset is acceptable, the first patch has to be merged into .37 to avoid ABI breakage. --- fs/btrfs/ctree.h | 3 + fs/btrfs/disk-io.c | 36 +++++++----- fs/btrfs/inode.c | 8 +++ fs/btrfs/ioctl.c | 147 +++++++++++++++++++++++++++++++++++++++++------- fs/btrfs/ioctl.h | 16 ++++- fs/btrfs/transaction.c | 8 +++ fs/btrfs/transaction.h | 1 + fs/btrfs/xattr.c | 18 ++++++ 8 files changed, 196 insertions(+), 41 deletions(-)