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| author | J. Bruce Fields <bfields@citi.umich.edu> | 2007-09-06 12:34:25 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2008-10-03 16:19:02 -0400 |
| commit | af558e33bedab672f5cfd3260bce7445e353fe21 (patch) | |
| tree | eb89187b6c12640a00584bd35be035ba332e4af3 /include | |
| parent | d5b337b4877f7c4e1d761434ee04d045b0201e03 (diff) | |
| download | linux-af558e33bedab672f5cfd3260bce7445e353fe21.tar.gz linux-af558e33bedab672f5cfd3260bce7445e353fe21.tar.bz2 linux-af558e33bedab672f5cfd3260bce7445e353fe21.zip | |
nfsd: common grace period control
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 8 | ||||
| -rw-r--r-- | include/linux/lockd/bind.h | 9 |
2 files changed, 8 insertions, 9 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 9f540165a078..27cfa723b92a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -942,6 +942,14 @@ struct lock_manager_operations { int (*fl_change)(struct file_lock **, int); }; +struct lock_manager { + struct list_head list; +}; + +void locks_start_grace(struct lock_manager *); +void locks_end_grace(struct lock_manager *); +int locks_in_grace(void); + /* that will die - we need it for nfs_lock_info */ #include <linux/nfs_fs_i.h> diff --git a/include/linux/lockd/bind.h b/include/linux/lockd/bind.h index 3d25bcd139d1..1f0465c374dc 100644 --- a/include/linux/lockd/bind.h +++ b/include/linux/lockd/bind.h @@ -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 */ |