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authorMarc Eshel <eshel@almaden.ibm.com>2007-07-17 04:04:35 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:07 -0700
commit9a8db97e7756119689c93c431e8b8324080f5625 (patch)
tree2e0ac28664b02c7e1c7a111c6e60ac059fd92ad8 /fs/lockd
parent12127498c8f5e479df15ee374a0932f5659df49e (diff)
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knfsd: lockd: nfsd4: use same grace period for lockd and nfsd4
Both lockd and (in the nfsv4 case) nfsd enforce a "grace period" after reboot, during which clients may reclaim locks from the previous server instance, but may not acquire new locks. Currently the lockd and nfsd enforce grace periods of different lengths. This may cause problems when we reboot a server with both v2/v3 and v4 clients. For example, if the lockd grace period is shorter (as is likely the case), then a v3 client might acquire a new lock that conflicts with a lock already held (but not yet reclaimed) by a v4 client. This patch calculates a lease time that lockd and nfsd can both use. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/lockd')
-rw-r--r--fs/lockd/svc.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 9fcdef50aad6..82e2192a0d5c 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -76,18 +76,31 @@ static const int nlm_port_min = 0, nlm_port_max = 65535;
static struct ctl_table_header * nlm_sysctl_table;
-static unsigned long set_grace_period(void)
+static unsigned long get_lockd_grace_period(void)
{
- unsigned long grace_period;
-
/* Note: nlm_timeout should always be nonzero */
if (nlm_grace_period)
- grace_period = ((nlm_grace_period + nlm_timeout - 1)
- / nlm_timeout) * nlm_timeout * HZ;
+ return roundup(nlm_grace_period, nlm_timeout) * HZ;
else
- grace_period = nlm_timeout * 5 * HZ;
+ return nlm_timeout * 5 * HZ;
+}
+
+unsigned long get_nfs_grace_period(void)
+{
+ unsigned long lockdgrace = get_lockd_grace_period();
+ unsigned long nfsdgrace = 0;
+
+ if (nlmsvc_ops)
+ nfsdgrace = nlmsvc_ops->get_grace_period();
+
+ return max(lockdgrace, nfsdgrace);
+}
+EXPORT_SYMBOL(get_nfs_grace_period);
+
+static unsigned long set_grace_period(void)
+{
nlmsvc_grace_period = 1;
- return grace_period + jiffies;
+ return get_nfs_grace_period() + jiffies;
}
static inline void clear_grace_period(void)