Hello,
This series makes read-only mappings compatible with read-only caps:
we no longer establish a watch, acquire header and object map locks,
etc. In addition, because images mapped read-only can no longer be
flipped to read-write, we allow read-only mappings with unsupported
features, as long as the image is still readable.
Thanks,
Ilya
Ilya Dryomov (9):
rbd: introduce rbd_is_snap()
rbd: introduce RBD_DEV_FLAG_READONLY
rbd: treat images mapped read-only seriously
rbd: disallow read-write partitions on images mapped read-only
rbd: don't acquire exclusive lock for read-only mappings
rbd: don't establish watch for read-only mappings
rbd: remove snapshot existence validation code
rbd: don't query snapshot features
rbd: ask for a weaker incompat mask for read-only mappings
drivers/block/rbd.c | 203 ++++++++++++++++++++------------------------
1 file changed, 93 insertions(+), 110 deletions(-)
--
2.19.2
