422 lines
14 KiB
C
422 lines
14 KiB
C
/*
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* linux/fs/nfs/nfs4_fs.h
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*
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* Copyright (C) 2005 Trond Myklebust
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*
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* NFSv4-specific filesystem definitions and declarations
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*/
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#ifndef __LINUX_FS_NFS_NFS4_FS_H
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#define __LINUX_FS_NFS_NFS4_FS_H
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#if IS_ENABLED(CONFIG_NFS_V4)
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#define NFS4_MAX_LOOP_ON_RECOVER (10)
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#include <linux/seqlock.h>
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struct idmap;
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enum nfs4_client_state {
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NFS4CLNT_MANAGER_RUNNING = 0,
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NFS4CLNT_CHECK_LEASE,
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NFS4CLNT_LEASE_EXPIRED,
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NFS4CLNT_RECLAIM_REBOOT,
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NFS4CLNT_RECLAIM_NOGRACE,
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NFS4CLNT_DELEGRETURN,
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NFS4CLNT_SESSION_RESET,
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NFS4CLNT_LEASE_CONFIRM,
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NFS4CLNT_SERVER_SCOPE_MISMATCH,
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NFS4CLNT_PURGE_STATE,
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NFS4CLNT_BIND_CONN_TO_SESSION,
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};
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#define NFS4_RENEW_TIMEOUT 0x01
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#define NFS4_RENEW_DELEGATION_CB 0x02
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struct nfs4_minor_version_ops {
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u32 minor_version;
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int (*call_sync)(struct rpc_clnt *clnt,
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struct nfs_server *server,
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struct rpc_message *msg,
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struct nfs4_sequence_args *args,
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struct nfs4_sequence_res *res);
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bool (*match_stateid)(const nfs4_stateid *,
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const nfs4_stateid *);
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int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
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struct nfs_fsinfo *);
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const struct nfs4_state_recovery_ops *reboot_recovery_ops;
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const struct nfs4_state_recovery_ops *nograce_recovery_ops;
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const struct nfs4_state_maintenance_ops *state_renewal_ops;
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};
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#define NFS_SEQID_CONFIRMED 1
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struct nfs_seqid_counter {
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ktime_t create_time;
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int owner_id;
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int flags;
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u32 counter;
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spinlock_t lock; /* Protects the list */
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struct list_head list; /* Defines sequence of RPC calls */
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struct rpc_wait_queue wait; /* RPC call delay queue */
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};
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struct nfs_seqid {
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struct nfs_seqid_counter *sequence;
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struct list_head list;
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struct rpc_task *task;
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};
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static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
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{
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if (seqid_mutating_err(-status))
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seqid->flags |= NFS_SEQID_CONFIRMED;
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}
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/*
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* NFS4 state_owners and lock_owners are simply labels for ordered
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* sequences of RPC calls. Their sole purpose is to provide once-only
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* semantics by allowing the server to identify replayed requests.
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*/
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struct nfs4_state_owner {
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struct nfs_server *so_server;
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struct list_head so_lru;
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unsigned long so_expires;
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struct rb_node so_server_node;
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struct rpc_cred *so_cred; /* Associated cred */
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spinlock_t so_lock;
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atomic_t so_count;
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unsigned long so_flags;
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struct list_head so_states;
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struct nfs_seqid_counter so_seqid;
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seqcount_t so_reclaim_seqcount;
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struct mutex so_delegreturn_mutex;
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};
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enum {
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NFS_OWNER_RECLAIM_REBOOT,
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NFS_OWNER_RECLAIM_NOGRACE
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};
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#define NFS_LOCK_NEW 0
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#define NFS_LOCK_RECLAIM 1
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#define NFS_LOCK_EXPIRED 2
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/*
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* struct nfs4_state maintains the client-side state for a given
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* (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
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*
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* OPEN:
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* In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
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* we need to know how many files are open for reading or writing on a
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* given inode. This information too is stored here.
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*
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* LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
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*/
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struct nfs4_lock_owner {
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unsigned int lo_type;
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#define NFS4_ANY_LOCK_TYPE (0U)
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#define NFS4_FLOCK_LOCK_TYPE (1U << 0)
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#define NFS4_POSIX_LOCK_TYPE (1U << 1)
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union {
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fl_owner_t posix_owner;
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pid_t flock_owner;
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} lo_u;
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};
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struct nfs4_lock_state {
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struct list_head ls_locks; /* Other lock stateids */
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struct nfs4_state * ls_state; /* Pointer to open state */
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#define NFS_LOCK_INITIALIZED 0
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unsigned long ls_flags;
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struct nfs_seqid_counter ls_seqid;
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nfs4_stateid ls_stateid;
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atomic_t ls_count;
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struct nfs4_lock_owner ls_owner;
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};
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/* bits for nfs4_state->flags */
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enum {
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LK_STATE_IN_USE,
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NFS_DELEGATED_STATE, /* Current stateid is delegation */
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NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
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NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
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NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
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NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
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NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
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NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
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};
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struct nfs4_state {
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struct list_head open_states; /* List of states for the same state_owner */
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struct list_head inode_states; /* List of states for the same inode */
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struct list_head lock_states; /* List of subservient lock stateids */
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struct nfs4_state_owner *owner; /* Pointer to the open owner */
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struct inode *inode; /* Pointer to the inode */
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unsigned long flags; /* Do we hold any locks? */
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spinlock_t state_lock; /* Protects the lock_states list */
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seqlock_t seqlock; /* Protects the stateid/open_stateid */
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nfs4_stateid stateid; /* Current stateid: may be delegation */
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nfs4_stateid open_stateid; /* OPEN stateid */
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/* The following 3 fields are protected by owner->so_lock */
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unsigned int n_rdonly; /* Number of read-only references */
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unsigned int n_wronly; /* Number of write-only references */
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unsigned int n_rdwr; /* Number of read/write references */
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fmode_t state; /* State on the server (R,W, or RW) */
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atomic_t count;
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};
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struct nfs4_exception {
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long timeout;
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int retry;
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struct nfs4_state *state;
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struct inode *inode;
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};
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struct nfs4_state_recovery_ops {
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int owner_flag_bit;
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int state_flag_bit;
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int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
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int (*recover_lock)(struct nfs4_state *, struct file_lock *);
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int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
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struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
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int (*reclaim_complete)(struct nfs_client *);
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int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
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struct rpc_cred *);
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};
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struct nfs4_state_maintenance_ops {
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int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
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struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
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int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
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};
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extern const struct dentry_operations nfs4_dentry_operations;
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/* dir.c */
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int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
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unsigned, umode_t, int *);
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/* super.c */
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extern struct file_system_type nfs4_fs_type;
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/* nfs4namespace.c */
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rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
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struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
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struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
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struct nfs_fh *, struct nfs_fattr *);
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/* nfs4proc.c */
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extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
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extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
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extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
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extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
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extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
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extern int nfs4_destroy_clientid(struct nfs_client *clp);
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extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
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extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
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extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
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extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
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extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
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struct nfs4_fs_locations *, struct page *);
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extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
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struct nfs_fh *, struct nfs_fattr *);
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extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
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extern int nfs4_release_lockowner(struct nfs4_lock_state *);
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extern const struct xattr_handler *nfs4_xattr_handlers[];
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#if defined(CONFIG_NFS_V4_1)
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static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
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{
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return server->nfs_client->cl_session;
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}
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extern int nfs4_setup_sequence(const struct nfs_server *server,
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struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
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struct rpc_task *task);
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extern int nfs41_setup_sequence(struct nfs4_session *session,
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struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
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struct rpc_task *task);
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extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
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extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
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extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
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struct nfs_fsinfo *fsinfo);
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extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
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bool sync);
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static inline bool
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is_ds_only_client(struct nfs_client *clp)
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{
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return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
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EXCHGID4_FLAG_USE_PNFS_DS;
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}
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static inline bool
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is_ds_client(struct nfs_client *clp)
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{
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return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
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}
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#else /* CONFIG_NFS_v4_1 */
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static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
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{
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return NULL;
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}
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static inline int nfs4_setup_sequence(const struct nfs_server *server,
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struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
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struct rpc_task *task)
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{
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rpc_call_start(task);
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return 0;
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}
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static inline bool
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is_ds_only_client(struct nfs_client *clp)
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{
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return false;
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}
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static inline bool
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is_ds_client(struct nfs_client *clp)
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{
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return false;
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}
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#endif /* CONFIG_NFS_V4_1 */
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extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
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extern const u32 nfs4_fattr_bitmap[3];
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extern const u32 nfs4_statfs_bitmap[2];
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extern const u32 nfs4_pathconf_bitmap[2];
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extern const u32 nfs4_fsinfo_bitmap[3];
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extern const u32 nfs4_fs_locations_bitmap[2];
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void nfs4_free_client(struct nfs_client *);
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struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
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/* nfs4renewd.c */
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extern void nfs4_schedule_state_renewal(struct nfs_client *);
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extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
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extern void nfs4_kill_renewd(struct nfs_client *);
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extern void nfs4_renew_state(struct work_struct *);
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/* nfs4state.c */
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struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
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struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
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struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
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int nfs4_discover_server_trunking(struct nfs_client *clp,
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struct nfs_client **);
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int nfs40_discover_server_trunking(struct nfs_client *clp,
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struct nfs_client **, struct rpc_cred *);
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#if defined(CONFIG_NFS_V4_1)
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struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
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int nfs41_discover_server_trunking(struct nfs_client *clp,
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struct nfs_client **, struct rpc_cred *);
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extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
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extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
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extern void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp);
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#else
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static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
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extern void nfs4_put_state_owner(struct nfs4_state_owner *);
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extern void nfs4_purge_state_owners(struct nfs_server *);
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extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
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extern void nfs4_put_open_state(struct nfs4_state *);
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extern void nfs4_close_state(struct nfs4_state *, fmode_t);
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extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
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extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
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extern void nfs_inode_find_state_and_recover(struct inode *inode,
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const nfs4_stateid *stateid);
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extern void nfs4_schedule_lease_recovery(struct nfs_client *);
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extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
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extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
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extern void nfs4_schedule_state_manager(struct nfs_client *);
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extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
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extern void nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
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extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
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extern void nfs41_handle_server_scope(struct nfs_client *,
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struct nfs41_server_scope **);
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extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
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extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
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extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
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fmode_t, const struct nfs_lockowner *);
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extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
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extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
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extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
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extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
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extern void nfs_release_seqid(struct nfs_seqid *seqid);
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extern void nfs_free_seqid(struct nfs_seqid *seqid);
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extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
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extern const nfs4_stateid zero_stateid;
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/* nfs4super.c */
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struct nfs_mount_info;
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extern struct nfs_subversion nfs_v4;
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struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
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extern bool nfs4_disable_idmapping;
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extern unsigned short max_session_slots;
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extern unsigned short send_implementation_id;
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#define NFS4_CLIENT_ID_UNIQ_LEN (64)
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extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
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/* nfs4sysctl.c */
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#ifdef CONFIG_SYSCTL
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int nfs4_register_sysctl(void);
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void nfs4_unregister_sysctl(void);
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#else
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static inline int nfs4_register_sysctl(void)
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{
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return 0;
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}
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static inline void nfs4_unregister_sysctl(void)
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{
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}
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#endif
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/* nfs4xdr.c */
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extern struct rpc_procinfo nfs4_procedures[];
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struct nfs4_mount_data;
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/* callback_xdr.c */
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extern struct svc_version nfs4_callback_version1;
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extern struct svc_version nfs4_callback_version4;
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static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
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{
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memcpy(dst, src, sizeof(*dst));
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}
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static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
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{
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return memcmp(dst, src, sizeof(*dst)) == 0;
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}
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#else
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#define nfs4_close_state(a, b) do { } while (0)
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#define nfs4_close_sync(a, b) do { } while (0)
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#endif /* CONFIG_NFS_V4 */
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#endif /* __LINUX_FS_NFS_NFS4_FS.H */
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