beb2a5ec38
According to RFC3530 we're supposed to cache the change attribute at the time the client receives a write delegation. If the inode is clean, a CB_GETATTR callback by the server to the client is supposed to return the cached change attribute. If, OTOH, the inode is dirty, the client should bump the cached change attribute by 1. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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* linux/fs/nfs/delegation.h
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*
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* Copyright (c) Trond Myklebust
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*
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* Definitions pertaining to NFS delegated files
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*/
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#ifndef FS_NFS_DELEGATION_H
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#define FS_NFS_DELEGATION_H
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#if defined(CONFIG_NFS_V4)
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/*
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* NFSv4 delegation
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*/
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struct nfs_delegation {
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struct list_head super_list;
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struct rpc_cred *cred;
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struct inode *inode;
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nfs4_stateid stateid;
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int type;
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#define NFS_DELEGATION_NEED_RECLAIM 1
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long flags;
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loff_t maxsize;
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__u64 change_attr;
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};
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int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
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void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
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int __nfs_inode_return_delegation(struct inode *inode);
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int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
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struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle);
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void nfs_return_all_delegations(struct super_block *sb);
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void nfs_expire_all_delegations(struct nfs4_client *clp);
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void nfs_handle_cb_pathdown(struct nfs4_client *clp);
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void nfs_delegation_mark_reclaim(struct nfs4_client *clp);
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void nfs_delegation_reap_unclaimed(struct nfs4_client *clp);
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/* NFSv4 delegation-related procedures */
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int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid);
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int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state);
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int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
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static inline int nfs_have_delegation(struct inode *inode, int flags)
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{
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flags &= FMODE_READ|FMODE_WRITE;
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smp_rmb();
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if ((NFS_I(inode)->delegation_state & flags) == flags)
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return 1;
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return 0;
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}
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static inline int nfs_inode_return_delegation(struct inode *inode)
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{
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int err = 0;
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if (NFS_I(inode)->delegation != NULL)
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err = __nfs_inode_return_delegation(inode);
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return err;
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}
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#else
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static inline int nfs_have_delegation(struct inode *inode, int flags)
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{
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return 0;
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}
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static inline int nfs_inode_return_delegation(struct inode *inode)
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{
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return 0;
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}
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#endif
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#endif
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