| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * linux/fs/nfs/delegation.h |
| 4 | * |
| 5 | * Copyright (c) Trond Myklebust |
| 6 | * |
| 7 | * Definitions pertaining to NFS delegated files |
| 8 | */ |
| 9 | #ifndef FS_NFS_DELEGATION_H |
| 10 | #define FS_NFS_DELEGATION_H |
| 11 | |
| 12 | #if IS_ENABLED(CONFIG_NFS_V4) |
| 13 | /* |
| 14 | * NFSv4 delegation |
| 15 | */ |
| 16 | struct nfs_delegation { |
| 17 | struct list_head super_list; |
| 18 | struct rpc_cred *cred; |
| 19 | struct inode *inode; |
| 20 | nfs4_stateid stateid; |
| 21 | fmode_t type; |
| 22 | unsigned long pagemod_limit; |
| 23 | __u64 change_attr; |
| 24 | unsigned long flags; |
| 25 | spinlock_t lock; |
| 26 | struct rcu_head rcu; |
| 27 | }; |
| 28 | |
| 29 | enum { |
| 30 | NFS_DELEGATION_NEED_RECLAIM = 0, |
| 31 | NFS_DELEGATION_RETURN, |
| 32 | NFS_DELEGATION_RETURN_IF_CLOSED, |
| 33 | NFS_DELEGATION_REFERENCED, |
| 34 | NFS_DELEGATION_RETURNING, |
| 35 | NFS_DELEGATION_REVOKED, |
| 36 | NFS_DELEGATION_TEST_EXPIRED, |
| 37 | NFS_DELEGATION_INODE_FREEING, |
| 38 | }; |
| 39 | |
| 40 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| 41 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res); |
| 42 | int nfs4_inode_return_delegation(struct inode *inode); |
| 43 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); |
| 44 | void nfs_inode_return_delegation_noreclaim(struct inode *inode); |
| 45 | |
| 46 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); |
| 47 | void nfs_server_return_all_delegations(struct nfs_server *); |
| 48 | void nfs_expire_all_delegations(struct nfs_client *clp); |
| 49 | void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags); |
| 50 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp); |
| 51 | int nfs_client_return_marked_delegations(struct nfs_client *clp); |
| 52 | int nfs_delegations_present(struct nfs_client *clp); |
| 53 | void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid); |
| 54 | |
| 55 | void nfs_delegation_mark_reclaim(struct nfs_client *clp); |
| 56 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp); |
| 57 | |
| 58 | void nfs_mark_test_expired_all_delegations(struct nfs_client *clp); |
| 59 | void nfs_reap_expired_delegations(struct nfs_client *clp); |
| 60 | |
| 61 | /* NFSv4 delegation-related procedures */ |
| 62 | int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync); |
| 63 | int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type); |
| 64 | int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid); |
| 65 | bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, struct rpc_cred **cred); |
| 66 | |
| 67 | struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode); |
| 68 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation); |
| 69 | int nfs4_have_delegation(struct inode *inode, fmode_t flags); |
| 70 | int nfs4_check_delegation(struct inode *inode, fmode_t flags); |
| 71 | bool nfs4_delegation_flush_on_close(const struct inode *inode); |
| 72 | void nfs_inode_find_delegation_state_and_recover(struct inode *inode, |
| 73 | const nfs4_stateid *stateid); |
| 74 | |
| 75 | #endif |
| 76 | |
| 77 | static inline int nfs_have_delegated_attributes(struct inode *inode) |
| 78 | { |
| 79 | return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) && |
| 80 | !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED); |
| 81 | } |
| 82 | |
| 83 | #endif |