888e694c16
Delegations allow us to cache posix and BSD locks, however when the delegation is recalled, we need to "flush the cache" and send the cached LOCK requests to the server. This patch sets up the mechanism for doing so. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
72 lines
2 KiB
C
72 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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};
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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_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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