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knfsd: lockd: nfsd4: use same grace period for lockd and nfsd4

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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>
This commit is contained in:
Marc Eshel 2007-07-17 04:04:35 -07:00 • committed by Linus Torvalds
parent 12127498c8
commit 9a8db97e77
4 changed files with 42 additions and 11 deletions
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9
include/linux/lockd/bind.h
View file

@ -27,6 +27,7 @@ struct nlmsvc_binding {
struct nfs_fh *,
struct file **);
void (*fclose)(struct file *);
unsigned long (*get_grace_period)(void);
};
extern struct nlmsvc_binding * nlmsvc_ops;
@ -38,4 +39,12 @@ extern int nlmclnt_proc(struct inode *, int, struct file_lock *);
extern int lockd_up(int proto);
extern void lockd_down(void);
unsigned long get_nfs_grace_period(void);
#ifdef CONFIG_NFSD_V4
unsigned long get_nfs4_grace_period(void);
#else
static inline unsigned long get_nfs4_grace_period(void) {return 0;}
#endif
#endif /* LINUX_LOCKD_BIND_H */