From 4373ea84c84d8a96e99d3da99e813d3e36d1bd11 Mon Sep 17 00:00:00 2001 From: Wendy Cheng Date: Thu, 17 Jan 2008 11:10:12 -0500 Subject: lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng Cc: Lon Hohberger Cc: Christoph Hellwig Signed-off-by: J. Bruce Fields fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-) --- include/linux/lockd/lockd.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index 94649a8da01..bcb93fc1fce 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -194,7 +194,7 @@ void nsm_release(struct nsm_handle *); * This is used in garbage collection and resource reclaim * A return value != 0 means destroy the lock/block/share */ -typedef int (*nlm_host_match_fn_t)(struct nlm_host *cur, struct nlm_host *ref); +typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref); /* * Server-side lock handling @@ -220,6 +220,11 @@ void nlmsvc_mark_resources(void); void nlmsvc_free_host_resources(struct nlm_host *); void nlmsvc_invalidate_all(void); +/* + * Cluster failover support + */ +int nlmsvc_unlock_all_by_ip(__be32 server_addr); + static inline struct inode *nlmsvc_file_inode(struct nlm_file *file) { return file->f_file->f_path.dentry->d_inode; -- cgit v1.2.3