This patch revives VDI locking mechanism. When two or more clients
(QEMU and tgt) try to open one VDI, sheep returns an error to the
later one.
Example:
$ sudo qemu-system-x86_64 -hda sheepdog:debian
qemu-system-x86_64: -hda sheepdog:debian: could not open disk image
sheepdog:debian: cannot get vdi info, VDI isn't locked, \
debian 0
v3:
- renaming functions
v2:
- Changes for QEMU side are needless
- Manual unlocking is required for keeping data integrity
-- New dog subcommands are provided for this purpose
Hitoshi Mitake (7):
sheep: change a prototype of process_main() for obtaining sender
information
sheep: revive lock operation
dog: use GET_VDI_INFO unconditionally in dog
sheep: snapshot and collect vdi state during joining to cluster
sheep: a new helper function for formatting struct node_id
dog: add a new subcommand "dog vdi lock list" for listing vdi locking
status
dog: add a new subcommand "dog vdi lock force-unlock" for unlocking
VDI forcibly
dog/treeview.c | 41 ++++++++
dog/treeview.h | 2 +
dog/vdi.c | 96 +++++++++++++++++-
include/internal_proto.h | 23 +++++
include/sheep.h | 11 +-
include/sheepdog_proto.h | 6 ++
sheep/group.c | 165 ++++++++++++++++++++++++++++--
sheep/ops.c | 177 +++++++++++++++++++++++++--------
sheep/request.c | 3 +-
sheep/sheep.c | 2 +
sheep/sheep_priv.h | 24 +++--
sheep/vdi.c | 254 +++++++++++++++++++++++++++++++++++++++++++++++
12 files changed, 736 insertions(+), 68 deletions(-)
--
1.8.3.2
--
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