| | 1 | /* |
| | 2 | * linux/fs/nfs/delegation.h |
| | 3 | * |
| | 4 | * Copyright (c) Trond Myklebust |
| | 5 | * |
| | 6 | * Definitions pertaining to NFS delegated files |
| | 7 | */ |
| | 8 | #ifndef FS_NFS_DELEGATION_H |
| | 9 | #define FS_NFS_DELEGATION_H |
| | 10 | |
| | 11 | #if defined(CONFIG_NFS_V4) |
| | 12 | /* |
| | 13 | * NFSv4 delegation |
| | 14 | */ |
| | 15 | struct nfs_delegation { |
| | 16 | struct list_head super_list; |
| | 17 | struct rpc_cred *cred; |
| | 18 | struct inode *inode; |
| | 19 | nfs4_stateid stateid; |
| | 20 | int type; |
| | 21 | #define NFS_DELEGATION_NEED_RECLAIM 1 |
| | 22 | long flags; |
| | 23 | loff_t maxsize; |
| | 24 | __u64 change_attr; |
| | 25 | spinlock_t lock; |
| | 26 | struct rcu_head rcu; |
| | 27 | }; |
| | 28 | |
| | 29 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| | 30 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| | 31 | int nfs_inode_return_delegation(struct inode *inode); |
| | 32 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); |
| | 33 | void nfs_inode_return_delegation_noreclaim(struct inode *inode); |
| | 34 | |
| | 35 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); |
| | 36 | void nfs_return_all_delegations(struct super_block *sb); |
| | 37 | void nfs_expire_all_delegations(struct nfs_client *clp); |
| | 38 | void nfs_handle_cb_pathdown(struct nfs_client *clp); |
| | 39 | |
| | 40 | void nfs_delegation_mark_reclaim(struct nfs_client *clp); |
| | 41 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp); |
| | 42 | |
| | 43 | /* NFSv4 delegation-related procedures */ |
| | 44 | int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); |
| | 45 | int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid); |
| | 46 | int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl); |
| | 47 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode); |
| | 48 | |
| | 49 | static inline int nfs_have_delegation(struct inode *inode, int flags) |
| | 50 | { |
| | 51 | struct nfs_delegation *delegation; |
| | 52 | int ret = 0; |
| | 53 | |
| | 54 | flags &= FMODE_READ|FMODE_WRITE; |
| | 55 | rcu_read_lock(); |
| | 56 | delegation = rcu_dereference(NFS_I(inode)->delegation); |
| | 57 | if (delegation != NULL && (delegation->type & flags) == flags) |
| | 58 | ret = 1; |
| | 59 | rcu_read_unlock(); |
| | 60 | return ret; |
| | 61 | } |
| | 62 | |
| | 63 | #else |
| | 64 | static inline int nfs_have_delegation(struct inode *inode, int flags) |
| | 65 | { |
| | 66 | return 0; |
| | 67 | } |
| | 68 | |
| | 69 | static inline int nfs_inode_return_delegation(struct inode *inode) |
| | 70 | { |
| | 71 | return 0; |
| | 72 | } |
| | 73 | #endif |
| | 74 | |
| | 75 | #endif |
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