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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8c75593c6e
The call to nfs_do_return_delegation() needs to be taken without
any RCU locks. Add a refcount to make sure the delegation remains
pinned in memory until we're done.
Fixes: ee05f45677 ("NFSv4: Fix races between open and delegreturn")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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 IS_ENABLED(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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const struct 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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unsigned long pagemod_limit;
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__u64 change_attr;
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unsigned long flags;
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refcount_t refcount;
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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_RETURN_IF_CLOSED,
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NFS_DELEGATION_REFERENCED,
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NFS_DELEGATION_RETURNING,
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NFS_DELEGATION_REVOKED,
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NFS_DELEGATION_TEST_EXPIRED,
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NFS_DELEGATION_INODE_FREEING,
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};
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int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
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fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
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void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
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fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
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int nfs4_inode_return_delegation(struct inode *inode);
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void nfs4_inode_return_delegation_on_close(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_evict_delegation(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_server_return_all_delegations(struct nfs_server *);
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void nfs_expire_all_delegations(struct nfs_client *clp);
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void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
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void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
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int nfs_client_return_marked_delegations(struct nfs_client *clp);
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int nfs_delegations_present(struct nfs_client *clp);
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void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
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void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
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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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void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
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void nfs_test_expired_all_delegations(struct nfs_client *clp);
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void nfs_reap_expired_delegations(struct nfs_client *clp);
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/* NFSv4 delegation-related procedures */
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int nfs4_proc_delegreturn(struct inode *inode, const struct 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 file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
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bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
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bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
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struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
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void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
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int nfs4_have_delegation(struct inode *inode, fmode_t flags);
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int nfs4_check_delegation(struct inode *inode, fmode_t flags);
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bool nfs4_delegation_flush_on_close(const struct inode *inode);
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void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
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const nfs4_stateid *stateid);
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int nfs4_inode_make_writeable(struct inode *inode);
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#endif
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static inline int nfs_have_delegated_attributes(struct inode *inode)
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{
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return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
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!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
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}
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#endif
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