GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-09 08:02:05 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

nfsd: common grace period control

Browse source 
Rewrite grace period code to unify management of grace period across
lockd and nfsd.  The current code has lockd and nfsd cooperate to
compute a grace period which is satisfactory to them both, and then
individually enforce it.  This creates a slight race condition, since
the enforcement is not coordinated.  It's also more complicated than
necessary.

Here instead we have lockd and nfsd each inform common code when they
enter the grace period, and when they're ready to leave the grace
period, and allow normal locking only after both of them are ready to
leave.

We also expect the locks_start_grace()/locks_end_grace() interface here
to be simpler to build on for future cluster/high-availability work,
which may require (for example) putting individual filesystems into
grace, or enforcing grace periods across multiple cluster nodes.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2007-09-06 12:34:25 -04:00
parent d5b337b487
commit af558e33be
10 changed files with 104 additions and 61 deletions
Download patch file Download diff file Expand all files Collapse all files

9
include/linux/lockd/bind.h
View file

@ -27,7 +27,6 @@ struct nlmsvc_binding {
struct nfs_fh *,
struct file **);
void (*fclose)(struct file *);
unsigned long (*get_grace_period)(void);
};
extern struct nlmsvc_binding * nlmsvc_ops;
@ -56,12 +55,4 @@ extern int nlmclnt_proc(struct nlm_host *host, int cmd,
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 */