NFSv4: Implement the fs_locations function call
NFSv4 allows for the fact that filesystems may be replicated across
several servers or that they may be migrated to a backup server in case of
failure of the primary server.
fs_locations is an NFSv4 operation for retrieving information about the
location of migrated and/or replicated filesystems.
Based on an initial implementation by Jiaying Zhang <jiayingz@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3084072..768514d 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3570,6 +3570,35 @@
return len;
}
+int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
+ struct nfs_fs_locations *fs_locations, struct page *page)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+ u32 bitmask[2] = {
+ [0] = server->attr_bitmask[0] | FATTR4_WORD0_FS_LOCATIONS,
+ [1] = server->attr_bitmask[1],
+ };
+ struct nfs4_fs_locations_arg args = {
+ .dir_fh = NFS_FH(dir),
+ .name = &dentry->d_name,
+ .page = page,
+ .bitmask = bitmask,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
+ .rpc_argp = &args,
+ .rpc_resp = &fs_locations,
+ };
+ int status;
+
+ dprintk("%s: start\n", __FUNCTION__);
+ fs_locations->fattr.valid = 0;
+ fs_locations->server = server;
+ status = rpc_call_sync(server->client, &msg, 0);
+ dprintk("%s: returned status = %d\n", __FUNCTION__, status);
+ return status;
+}
+
struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
.recover_open = nfs4_open_reclaim,
.recover_lock = nfs4_lock_reclaim,