ecdbf769b2
If the lock blocks, the server may send us a GRANTED message that races with the reply to our LOCK request. Make sure that we catch the GRANTED by queueing up our request on the nlm_blocked list before we send off the first LOCK rpc call. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
230 lines
6.8 KiB
C
230 lines
6.8 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/config.h>
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#include <linux/in.h>
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#include <linux/fs.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 nlm_host * h_next; /* linked list (hash table) */
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struct sockaddr_in h_addr; /* peer address */
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struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
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char h_name[20]; /* 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_inuse : 1,
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h_killed : 1,
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h_monitored : 1;
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wait_queue_head_t h_gracewait; /* wait while reclaiming */
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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 semaphore h_sema; /* 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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};
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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 (sizeof(system_utsname.nodename)+10)
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struct nlm_rqst {
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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_wait * a_block;
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char 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 nlm_file * f_next; /* 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 nlm_block * 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 semaphore f_sema; /* avoid concurrent access */
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int f_hash; /* hash of f_handle */
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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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struct nlm_block {
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struct nlm_block * b_next; /* linked list (all blocks) */
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struct nlm_block * b_fnext; /* 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_queued; /* re-queued */
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unsigned char b_granted; /* VFS granted lock */
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unsigned char b_incall; /* doing callback */
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unsigned char b_done; /* callback complete */
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struct nlm_file * b_file; /* file in question */
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};
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/*
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* Valid actions for nlmsvc_traverse_files
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*/
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#define NLM_ACT_CHECK 0 /* check for locks */
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#define NLM_ACT_MARK 1 /* mark & sweep */
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#define NLM_ACT_UNLOCK 2 /* release all locks */
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/*
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* Global variables
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*/
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extern 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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/*
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* Lockd client functions
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*/
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struct nlm_rqst * nlmclnt_alloc_call(void);
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int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl);
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void nlmclnt_finish_block(struct nlm_rqst *req);
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long nlmclnt_block(struct nlm_rqst *req, long timeout);
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int nlmclnt_cancel(struct nlm_host *, struct file_lock *);
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u32 nlmclnt_grant(struct nlm_lock *);
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void nlmclnt_recovery(struct nlm_host *, u32);
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int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
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int nlmclnt_setgrantargs(struct nlm_rqst *, struct nlm_lock *);
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void nlmclnt_freegrantargs(struct nlm_rqst *);
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/*
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* Host cache
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*/
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struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int);
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struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
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struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, int);
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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_release_host(struct nlm_host *);
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void nlm_shutdown_hosts(void);
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extern struct nlm_host *nlm_find_client(void);
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/*
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* Server-side lock handling
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*/
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int nlmsvc_async_call(struct nlm_rqst *, u32, rpc_action);
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u32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
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struct nlm_lock *, int, struct nlm_cookie *);
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u32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
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u32 nlmsvc_testlock(struct nlm_file *, struct nlm_lock *,
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struct nlm_lock *);
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u32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
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unsigned long nlmsvc_retry_blocked(void);
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int nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
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int action);
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void nlmsvc_grant_reply(struct svc_rqst *, struct nlm_cookie *, u32);
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/*
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* File handling for the server personality
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*/
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u32 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(void);
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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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static __inline__ struct inode *
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nlmsvc_file_inode(struct nlm_file *file)
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{
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return file->f_file->f_dentry->d_inode;
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}
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/*
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* Compare two host addresses (needs modifying for ipv6)
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*/
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static __inline__ int
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nlm_cmp_addr(struct sockaddr_in *sin1, struct sockaddr_in *sin2)
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{
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return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
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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
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nlm_compare_locks(struct file_lock *fl1, 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_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 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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