f092075dd3
Currently our NFS client assigns a unique SETCLIENTID boot verifier for each server IP address it knows about. It's set to CURRENT_TIME when the struct nfs_client for that server IP is created. During the SETCLIENTID operation, our client also presents an nfs_client_id4 string to servers, as an identifier on which the server can hang all of this client's NFSv4 state. Our client's nfs_client_id4 string is unique for each server IP address. An NFSv4 server is obligated to wipe all NFSv4 state associated with an nfs_client_id4 string when the client presents the same nfs_client_id4 string along with a changed SETCLIENTID boot verifier. When our client unmounts the last of a server's shares, it destroys that server's struct nfs_client. The next time the client mounts that NFS server, it creates a fresh struct nfs_client with a fresh boot verifier. On seeing the fresh verifer, the server wipes any previous NFSv4 state associated with that nfs_client_id4. However, NFSv4.1 clients are supposed to present the same nfs_client_id4 string to all servers. And, to support Transparent State Migration, the same nfs_client_id4 string should be presented to all NFSv4.0 servers so they recognize that migrated state for this client belongs with state a server may already have for this client. (This is known as the Uniform Client String model). If the nfs_client_id4 string is the same but the boot verifier changes for each server IP address, SETCLIENTID and EXCHANGE_ID operations from such a client could unintentionally result in a server wiping a client's previously obtained lease. Thus, if our NFS client is going to use a fixed nfs_client_id4 string, either for NFSv4.0 or NFSv4.1 mounts, our NFS client should use a boot verifier that does not change depending on server IP address. Replace our current per-nfs_client boot verifier with a per-nfs_net boot verifier. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
33 lines
660 B
C
33 lines
660 B
C
/*
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* NFS-private data for each "struct net". Accessed with net_generic().
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*/
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#ifndef __NFS_NETNS_H__
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#define __NFS_NETNS_H__
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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struct bl_dev_msg {
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int32_t status;
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uint32_t major, minor;
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};
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struct nfs_net {
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struct cache_detail *nfs_dns_resolve;
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struct rpc_pipe *bl_device_pipe;
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struct bl_dev_msg bl_mount_reply;
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wait_queue_head_t bl_wq;
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struct list_head nfs_client_list;
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struct list_head nfs_volume_list;
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#ifdef CONFIG_NFS_V4
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struct idr cb_ident_idr; /* Protected by nfs_client_lock */
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#endif
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spinlock_t nfs_client_lock;
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struct timespec boot_time;
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};
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extern int nfs_net_id;
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#endif
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