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 const struct 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 }; 38 39 int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred, 40 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit); 41 void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred, 42 fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit); 43 int nfs4_inode_return_delegation(struct inode *inode); 44 int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid); 45 void nfs_inode_return_delegation_noreclaim(struct inode *inode); 46 47 struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle); 48 void nfs_server_return_all_delegations(struct nfs_server *); 49 void nfs_expire_all_delegations(struct nfs_client *clp); 50 void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags); 51 void nfs_expire_unreferenced_delegations(struct nfs_client *clp); 52 int nfs_client_return_marked_delegations(struct nfs_client *clp); 53 int nfs_delegations_present(struct nfs_client *clp); 54 void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid); 55 56 void nfs_delegation_mark_reclaim(struct nfs_client *clp); 57 void nfs_delegation_reap_unclaimed(struct nfs_client *clp); 58 59 void nfs_mark_test_expired_all_delegations(struct nfs_client *clp); 60 void nfs_reap_expired_delegations(struct nfs_client *clp); 61 62 /* NFSv4 delegation-related procedures */ 63 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync); 64 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid, fmode_t type); 65 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid); 66 bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred); 67 bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode); 68 69 void nfs_mark_delegation_referenced(struct nfs_delegation *delegation); 70 int nfs4_have_delegation(struct inode *inode, fmode_t flags); 71 int nfs4_check_delegation(struct inode *inode, fmode_t flags); 72 bool nfs4_delegation_flush_on_close(const struct inode *inode); 73 void nfs_inode_find_delegation_state_and_recover(struct inode *inode, 74 const nfs4_stateid *stateid); 75 int nfs4_inode_make_writeable(struct inode *inode); 76 77 #endif 78 79 static inline int nfs_have_delegated_attributes(struct inode *inode) 80 { 81 return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) && 82 !(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED); 83 } 84 85 #endif 86