aaaa99423b
If the server returns NLM_LCK_DENIED_NOLOCKS, we currently retry the entire NLM_CANCEL request. This may end up looping forever unless the server changes its mind (why would it do that, though?). Ensure that we limit the number of retries (to 3). See bug# 5957 in bugzilla.kernel.org. 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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unsigned int a_retries; /* Retry count */
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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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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, const struct rpc_call_ops *);
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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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