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authorNeilBrown <neilb@cse.unsw.edu.au>2005-06-24 01:04:25 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-24 03:06:35 -0400
commit190e4fbf96037e5e526ba3210f2bcc2a3b6fe964 (patch)
tree957fb35a6a2895622c4db0052160fd91d06153e8 /include/linux/nfsd
parentcb36d6345752fa24827044c68e15f6708a40d9f6 (diff)
[PATCH] knfsd: nfsd4: initialize recovery directory
NFSv4 clients are required to know what state they have on the server so that they can reclaim it on server reboot. However, it is possible for pathalogical combinations of server reboots and network partitions to leave a client in a state where it cannot know whether it has lost its state on the server. For this reason, rfc3530 requires that we store some information about clients to stable storage. So we maintain a directory /var/lib/nfs/v4recovery with a subdirectory for each client with active state. We leave open the possibility of including files underneath each such subdirectory with information about the client, but for now the subdirectories are empty. We create a client subdirectory whenever a client makes its first non-reclaim open_confirm. We remove a client subdirectory whenever either a) its lease expires, or b) the grace period ends without it reclaiming anything. When handling reclaims, we allow the reclaim if and only if the client doing the reclaim has a subdirectory. This patch adds just the code to scan the recovery directory on nfsd startup. Signed-off-by: Andy Adamson <andros@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/nfsd')
-rw-r--r--include/linux/nfsd/state.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 83d29ec03a58..19481ab122df 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -278,6 +278,10 @@ extern void nfsd4_probe_callback(struct nfs4_client *clp);
278extern void nfsd4_cb_recall(struct nfs4_delegation *dp); 278extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
279extern void nfs4_put_delegation(struct nfs4_delegation *dp); 279extern void nfs4_put_delegation(struct nfs4_delegation *dp);
280extern int nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname); 280extern int nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
281extern void nfsd4_init_recdir(char *recdir_name);
282extern int nfsd4_recdir_load(void);
283extern void nfsd4_shutdown_recdir(void);
284extern int nfs4_client_to_reclaim(const char *name);
281 285
282static inline void 286static inline void
283nfs4_put_stateowner(struct nfs4_stateowner *so) 287nfs4_put_stateowner(struct nfs4_stateowner *so)