[Cluster-devel] [PATCH 2/3] NLM per-ip grace period - core
Wendy Cheng
wcheng at redhat.com
Fri Jan 25 05:17:30 UTC 2008
The logic is implemented on top of linux nfsd procfs with core functions
residing in lockd kernel module. Entry function is nlmsvc_resume_ip()
where it stores the requested ip interface into a linked-list
nlm_failover_list. The list entry count is nlm_failover_cnt and access
protection is done by nlm_failover_mutex. Entry in nlm_failover_ip_list
is a "nlm_failover_struct", defined in: include/linux/lockd/lockd.h.
The list is kept in descending order (newer entry first) based on
g_expire jiffies. For per ip grace period checking, the search goes thru
the list. As soon as one match ip is found, the search stops. This
implies older entries will not be used and always expire before new
entry. This is to allow multiple entries (for the same ip) to be added
into the list. The maximum size of the list entries is NLM_FO_MAX_GP_CNT
(1024).
-- Wendy
-------------- next part --------------
A non-text attachment was scrubbed...
Name: resume_002.patch
Type: text/x-patch
Size: 7606 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/cluster-devel/attachments/20080125/dd51e9e7/attachment.bin>
More information about the Cluster-devel
mailing list