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authorMarc Eshel <eshel@almaden.ibm.com>2007-07-17 15:04:35 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 21:23:07 +0400
commit9a8db97e7756119689c93c431e8b8324080f5625 (patch)
tree2e0ac28664b02c7e1c7a111c6e60ac059fd92ad8 /fs/nfsd
parent12127498c8f5e479df15ee374a0932f5659df49e (diff)
downloadlinux-9a8db97e7756119689c93c431e8b8324080f5625.tar.xz
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/nfsd')
-rw-r--r--fs/nfsd/lockd.c1
-rw-r--r--fs/nfsd/nfs4state.c16
2 files changed, 13 insertions, 4 deletions
diff --git a/fs/nfsd/lockd.c b/fs/nfsd/lockd.c
index 221acd1f11f6..9e4a568a5013 100644
--- a/fs/nfsd/lockd.c
+++ b/fs/nfsd/lockd.c
@@ -65,6 +65,7 @@ nlm_fclose(struct file *filp)
static struct nlmsvc_binding nfsd_nlm_ops = {
.fopen = nlm_fopen, /* open file for locking */
.fclose = nlm_fclose, /* close file */
+ .get_grace_period = get_nfs4_grace_period,
};
void
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8c52913d7cb6..9cc31eaf3857 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -51,6 +51,7 @@
#include <linux/namei.h>
#include <linux/mutex.h>
#include <linux/lockd/bind.h>
+#include <linux/module.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
@@ -3190,20 +3191,27 @@ nfsd4_load_reboot_recovery_data(void)
printk("NFSD: Failure reading reboot recovery data\n");
}
+unsigned long
+get_nfs4_grace_period(void)
+{
+ return max(user_lease_time, lease_time) * HZ;
+}
+
/* initialization to perform when the nfsd service is started: */
static void
__nfs4_state_start(void)
{
- time_t grace_time;
+ unsigned long grace_time;
boot_time = get_seconds();
- grace_time = max(user_lease_time, lease_time);
+ grace_time = get_nfs_grace_period();
lease_time = user_lease_time;
in_grace = 1;
- printk("NFSD: starting %ld-second grace period\n", grace_time);
+ printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
+ grace_time/HZ);
laundry_wq = create_singlethread_workqueue("nfsd4");
- queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
+ queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
}
int