Netlink dumps have a traditional weakness of being interruptible and
non-atomic. Once the message buffer has been filled, all protective
locks must be released and the buffer is handed over to the user to
copy the data. The dumping then continues from the previously stored
offsets in the data structures. Due to dropping of the locks, mutations
can occur.
This first series introduces a new notification mechanism which allows
users of rhashtable to bump a sequence number on resizes and report
an inconsistent dump to user space.
As discussed in the netdev thread ("[PATCH 7/9] rhashtable: Per bucket
locks & deferred expansion/shrinking").
Thomas Graf (3):
rhashtable: Provide notifier for deferred resizes
netlink: Mark dumps as inconsistent which have been interrupted by a
resize
netlink: Lock out table resizes while dumping Netlink sockets
include/linux/rhashtable.h | 10 +++++++++-
lib/rhashtable.c | 13 ++++++++++---
net/netlink/af_netlink.c | 10 ++++++++++
net/netlink/af_netlink.h | 1 +
net/netlink/diag.c | 4 ++++
5 files changed, 34 insertions(+), 4 deletions(-)
--
1.9.3
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