This patchset adds readonly-snapshots support. You can create a
readonly snapshot, and you can also set a snapshot (subvolume also)
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.
The patchset is also available in:
git://repo.or.cz/linux-btrfs-devel.git readonly-snapshots
Note: I've 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 | 193 +++++++++++++++++++++++++++++++++++++++---------
fs/btrfs/ioctl.h | 19 ++++-
fs/btrfs/transaction.c | 8 ++
fs/btrfs/transaction.h | 1 +
fs/btrfs/xattr.c | 18 +++++
8 files changed, 230 insertions(+), 56 deletions(-)
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