366 lines
11 KiB
C
366 lines
11 KiB
C
/*
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* linux/include/linux/lockd/lockd.h
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*
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* General-purpose lockd include file.
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*
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* Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef LINUX_LOCKD_LOCKD_H
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#define LINUX_LOCKD_LOCKD_H
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#ifdef __KERNEL__
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <net/ipv6.h>
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#include <linux/fs.h>
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#include <linux/kref.h>
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#include <linux/utsname.h>
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#include <linux/nfsd/nfsfh.h>
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#include <linux/lockd/bind.h>
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#include <linux/lockd/xdr.h>
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#ifdef CONFIG_LOCKD_V4
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#include <linux/lockd/xdr4.h>
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#endif
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#include <linux/lockd/debug.h>
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/*
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* Version string
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*/
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#define LOCKD_VERSION "0.5"
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/*
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* Default timeout for RPC calls (seconds)
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*/
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#define LOCKD_DFLT_TIMEO 10
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/*
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* Lockd host handle (used both by the client and server personality).
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*/
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struct nlm_host {
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struct hlist_node h_hash; /* doubly linked list */
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struct sockaddr_storage h_addr; /* peer address */
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size_t h_addrlen;
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struct sockaddr_storage h_srcaddr; /* our address (optional) */
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size_t h_srcaddrlen;
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struct rpc_clnt *h_rpcclnt; /* RPC client to talk to peer */
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char *h_name; /* remote hostname */
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u32 h_version; /* interface version */
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unsigned short h_proto; /* transport proto */
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unsigned short h_reclaiming : 1,
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h_server : 1, /* server side, not client side */
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h_noresvport : 1,
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h_inuse : 1;
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wait_queue_head_t h_gracewait; /* wait while reclaiming */
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struct rw_semaphore h_rwsem; /* Reboot recovery lock */
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u32 h_state; /* pseudo-state counter */
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u32 h_nsmstate; /* true remote NSM state */
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u32 h_pidcount; /* Pseudopids */
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atomic_t h_count; /* reference count */
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struct mutex h_mutex; /* mutex for pmap binding */
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unsigned long h_nextrebind; /* next portmap call */
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unsigned long h_expires; /* eligible for GC */
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struct list_head h_lockowners; /* Lockowners for the client */
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spinlock_t h_lock;
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struct list_head h_granted; /* Locks in GRANTED state */
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struct list_head h_reclaim; /* Locks in RECLAIM state */
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struct nsm_handle *h_nsmhandle; /* NSM status handle */
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char *h_addrbuf; /* address eyecatcher */
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struct net *net; /* host net */
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};
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/*
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* The largest string sm_addrbuf should hold is a full-size IPv6 address
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* (no "::" anywhere) with a scope ID. The buffer size is computed to
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* hold eight groups of colon-separated four-hex-digit numbers, a
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* percent sign, a scope id (at most 32 bits, in decimal), and NUL.
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*/
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#define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
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struct nsm_handle {
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struct list_head sm_link;
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atomic_t sm_count;
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char *sm_mon_name;
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char *sm_name;
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struct sockaddr_storage sm_addr;
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size_t sm_addrlen;
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unsigned int sm_monitored : 1,
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sm_sticky : 1; /* don't unmonitor */
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struct nsm_private sm_priv;
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char sm_addrbuf[NSM_ADDRBUF];
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};
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/*
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* Rigorous type checking on sockaddr type conversions
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*/
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static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
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{
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return (struct sockaddr_in *)&host->h_addr;
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}
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static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
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{
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return (struct sockaddr *)&host->h_addr;
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}
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static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
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{
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return (struct sockaddr_in *)&host->h_srcaddr;
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}
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static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
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{
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return (struct sockaddr *)&host->h_srcaddr;
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}
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/*
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* Map an fl_owner_t into a unique 32-bit "pid"
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*/
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struct nlm_lockowner {
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struct list_head list;
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atomic_t count;
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struct nlm_host *host;
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fl_owner_t owner;
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uint32_t pid;
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};
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struct nlm_wait;
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/*
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* Memory chunk for NLM client RPC request.
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*/
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#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
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struct nlm_rqst {
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atomic_t a_count;
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unsigned int a_flags; /* initial RPC task flags */
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struct nlm_host * a_host; /* host handle */
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struct nlm_args a_args; /* arguments */
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struct nlm_res a_res; /* result */
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struct nlm_block * a_block;
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unsigned int a_retries; /* Retry count */
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u8 a_owner[NLMCLNT_OHSIZE];
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};
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/*
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* This struct describes a file held open by lockd on behalf of
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* an NFS client.
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*/
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struct nlm_file {
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struct hlist_node f_list; /* linked list */
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struct nfs_fh f_handle; /* NFS file handle */
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struct file * f_file; /* VFS file pointer */
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struct nlm_share * f_shares; /* DOS shares */
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struct list_head f_blocks; /* blocked locks */
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unsigned int f_locks; /* guesstimate # of locks */
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unsigned int f_count; /* reference count */
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struct mutex f_mutex; /* avoid concurrent access */
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};
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/*
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* This is a server block (i.e. a lock requested by some client which
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* couldn't be granted because of a conflicting lock).
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*/
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#define NLM_NEVER (~(unsigned long) 0)
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/* timeout on non-blocking call: */
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#define NLM_TIMEOUT (7 * HZ)
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struct nlm_block {
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struct kref b_count; /* Reference count */
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struct list_head b_list; /* linked list of all blocks */
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struct list_head b_flist; /* linked list (per file) */
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struct nlm_rqst * b_call; /* RPC args & callback info */
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struct svc_serv * b_daemon; /* NLM service */
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struct nlm_host * b_host; /* host handle for RPC clnt */
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unsigned long b_when; /* next re-xmit */
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unsigned int b_id; /* block id */
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unsigned char b_granted; /* VFS granted lock */
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struct nlm_file * b_file; /* file in question */
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struct cache_req * b_cache_req; /* deferred request handling */
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struct file_lock * b_fl; /* set for GETLK */
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struct cache_deferred_req * b_deferred_req;
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unsigned int b_flags; /* block flags */
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#define B_QUEUED 1 /* lock queued */
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#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
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#define B_TIMED_OUT 4 /* filesystem too slow to respond */
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};
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/*
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* Global variables
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*/
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extern const struct rpc_program nlm_program;
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extern struct svc_procedure nlmsvc_procedures[];
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#ifdef CONFIG_LOCKD_V4
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extern struct svc_procedure nlmsvc_procedures4[];
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#endif
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extern int nlmsvc_grace_period;
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extern unsigned long nlmsvc_timeout;
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extern bool nsm_use_hostnames;
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extern u32 nsm_local_state;
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/*
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* Lockd client functions
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*/
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struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
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int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
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int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
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void nlmclnt_release_call(struct nlm_rqst *);
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struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
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void nlmclnt_finish_block(struct nlm_wait *block);
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int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
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__be32 nlmclnt_grant(const struct sockaddr *addr,
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const struct nlm_lock *lock);
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void nlmclnt_recovery(struct nlm_host *);
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int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
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void nlmclnt_next_cookie(struct nlm_cookie *);
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/*
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* Host cache
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*/
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struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
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const size_t salen,
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const unsigned short protocol,
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const u32 version,
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const char *hostname,
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int noresvport,
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struct net *net);
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void nlmclnt_release_host(struct nlm_host *);
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struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
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const char *hostname,
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const size_t hostname_len);
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void nlmsvc_release_host(struct nlm_host *);
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struct rpc_clnt * nlm_bind_host(struct nlm_host *);
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void nlm_rebind_host(struct nlm_host *);
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struct nlm_host * nlm_get_host(struct nlm_host *);
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void nlm_shutdown_hosts(void);
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void nlm_shutdown_hosts_net(struct net *net);
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void nlm_host_rebooted(const struct nlm_reboot *);
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/*
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* Host monitoring
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*/
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int nsm_monitor(const struct nlm_host *host);
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void nsm_unmonitor(const struct nlm_host *host);
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struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
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const size_t salen,
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const char *hostname,
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const size_t hostname_len);
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struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info);
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void nsm_release(struct nsm_handle *nsm);
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/*
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* This is used in garbage collection and resource reclaim
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* A return value != 0 means destroy the lock/block/share
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*/
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typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
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/*
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* Server-side lock handling
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*/
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__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
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struct nlm_host *, struct nlm_lock *, int,
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struct nlm_cookie *, int);
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__be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
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__be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
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struct nlm_host *, struct nlm_lock *,
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struct nlm_lock *, struct nlm_cookie *);
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__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
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unsigned long nlmsvc_retry_blocked(void);
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void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
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nlm_host_match_fn_t match);
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void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
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void nlmsvc_release_call(struct nlm_rqst *);
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/*
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* File handling for the server personality
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*/
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__be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
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struct nfs_fh *);
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void nlm_release_file(struct nlm_file *);
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void nlmsvc_mark_resources(struct net *);
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void nlmsvc_free_host_resources(struct nlm_host *);
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void nlmsvc_invalidate_all(void);
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/*
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* Cluster failover support
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*/
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int nlmsvc_unlock_all_by_sb(struct super_block *sb);
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int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
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static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
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{
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return file->f_file->f_path.dentry->d_inode;
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}
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static inline int __nlm_privileged_request4(const struct sockaddr *sap)
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{
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const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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if (ntohs(sin->sin_port) > 1023)
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return 0;
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return ipv4_is_loopback(sin->sin_addr.s_addr);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int __nlm_privileged_request6(const struct sockaddr *sap)
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{
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const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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if (ntohs(sin6->sin6_port) > 1023)
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return 0;
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if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
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return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
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return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
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}
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#else /* IS_ENABLED(CONFIG_IPV6) */
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static inline int __nlm_privileged_request6(const struct sockaddr *sap)
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{
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return 0;
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}
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#endif /* IS_ENABLED(CONFIG_IPV6) */
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/*
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* Ensure incoming requests are from local privileged callers.
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*
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* Return TRUE if sender is local and is connecting via a privileged port;
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* otherwise return FALSE.
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*/
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static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
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{
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const struct sockaddr *sap = svc_addr(rqstp);
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switch (sap->sa_family) {
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case AF_INET:
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return __nlm_privileged_request4(sap);
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case AF_INET6:
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return __nlm_privileged_request6(sap);
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default:
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return 0;
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}
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}
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/*
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* Compare two NLM locks.
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* When the second lock is of type F_UNLCK, this acts like a wildcard.
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*/
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static inline int nlm_compare_locks(const struct file_lock *fl1,
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const struct file_lock *fl2)
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{
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return fl1->fl_pid == fl2->fl_pid
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&& fl1->fl_owner == fl2->fl_owner
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&& fl1->fl_start == fl2->fl_start
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&& fl1->fl_end == fl2->fl_end
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&&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
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}
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extern const struct lock_manager_operations nlmsvc_lock_operations;
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#endif /* __KERNEL__ */
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#endif /* LINUX_LOCKD_LOCKD_H */
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