This patchset is an early draft of checkpoint/restart of file-locks/leases.
This patchset applies on top of the ckpt-v21-rc7 branch of the Checkpoint/ restart git tree (see http://ckpt.wiki.kernel.org for details). To checkpoint/restart file-locks and leases we find each lock/lease held by each fd of the process and save the information about the lock/lease in the checkpoint-image. When restarting, each process reacquires the locks it held at checkpoint. When all processes have acquired the locks one-by-one, the entire process tree is allowed to execute. Any processes blocked on a lock at the time of checkpoint, restart their system call and end up blocking on the lock again after the restart. Checkpoint/restart of file-leases, specially the leases that are being revoked appear to be more tricky - Patch 6/6 has the details. [PATCH 1/6] Move file_lock macros into linux/fs.h [PATCH 2/6] Checkpoint file-locks [PATCH 3/6] Define flock_set() [PATCH 4/6] Restore file-locks [PATCH 5/6] Define do_setlease() [PATCH 6/6] Checkpoint/restart file leases This patchset has been gently tested with a few C/R testcases and needs more testing. Pls let me know your comments or if there are semantics that might change. Patch 6 identifies a couple of semantics for leases and suggests a way to preserve them. But maybe there is a cleaner/easier way to do so. Note: For consistency with current uses of for_each_lock(), this patchset uses lock_kernel(), but not sure yet if it is required. Signed-off-by: Sukadev Bhattiprolu <[email protected]> _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
