d18cc1fda2
The nfsv4 state manager could potentially deadlock inside __nfs_inode_return_delegation() if the server reboots, so that the calls to nfs_msync_inode() end up waiting on state recovery to complete. Also ensure that if a server reboot or network partition causes us to have to stop returning delegations, that NFS4CLNT_DELEGRETURN is set so that the state manager can resume any outstanding delegation returns after it has dealt with the state recovery situation. Finally, ensure that the state manager doesn't wait for the DELEGRETURN call to complete. It doesn't need to, and that too can cause a deadlock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
71 lines
2.2 KiB
C
71 lines
2.2 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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fmode_t type;
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loff_t maxsize;
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__u64 change_attr;
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unsigned long flags;
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spinlock_t lock;
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struct rcu_head rcu;
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};
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enum {
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NFS_DELEGATION_NEED_RECLAIM = 0,
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NFS_DELEGATION_RETURN,
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NFS_DELEGATION_REFERENCED,
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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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void nfs_inode_return_delegation_noreclaim(struct inode *inode);
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struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
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void nfs_super_return_all_delegations(struct super_block *sb);
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void nfs_expire_all_delegations(struct nfs_client *clp);
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void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
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void nfs_handle_cb_pathdown(struct nfs_client *clp);
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int nfs_client_return_marked_delegations(struct nfs_client *clp);
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void nfs_delegation_mark_reclaim(struct nfs_client *clp);
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void nfs_delegation_reap_unclaimed(struct nfs_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, int issync);
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int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
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int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl);
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int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
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void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
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int nfs_have_delegation(struct inode *inode, fmode_t flags);
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#else
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static inline int nfs_have_delegation(struct inode *inode, fmode_t 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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