include/linux/lockd/lockd.h

   1 /*
   2  * linux/include/linux/lockd/lockd.h
   3  *
   4  * General-purpose lockd include file.
   5  *
   6  * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifndef LINUX_LOCKD_LOCKD_H
  10 #define LINUX_LOCKD_LOCKD_H
  11
  12 #ifdef __KERNEL__
  13
  14 #include <linux/config.h>
  15 #include <linux/in.h>
  16 #include <linux/fs.h>
  17 #include <linux/utsname.h>
  18 #include <linux/nfsd/nfsfh.h>
  19 #include <linux/lockd/bind.h>
  20 #include <linux/lockd/xdr.h>
  21 #ifdef CONFIG_LOCKD_V4
  22 #include <linux/lockd/xdr4.h>
  23 #endif
  24 #include <linux/lockd/debug.h>
  25
  26 /*
  27  * Version string
  28  */
  29 #define LOCKD_VERSION           "0.5"
  30
  31 /*
  32  * Default timeout for RPC calls (seconds)
  33  */
  34 #define LOCKD_DFLT_TIMEO        10
  35
  36 /*
  37  * Lockd host handle (used both by the client and server personality).
  38  */
  39 struct nlm_host {
  40         struct nlm_host *       h_next;         /* linked list (hash table) */
  41         struct sockaddr_in      h_addr;         /* peer address */
  42         struct rpc_clnt *       h_rpcclnt;      /* RPC client to talk to peer */
  43         char                    h_name[20];     /* remote hostname */
  44         u32                     h_version;      /* interface version */
  45         unsigned short          h_proto;        /* transport proto */
  46         unsigned short          h_reclaiming : 1,
  47                                 h_server     : 1, /* server side, not client side */
  48                                 h_inuse      : 1,
  49                                 h_killed     : 1,
  50                                 h_monitored  : 1;
  51         wait_queue_head_t       h_gracewait;    /* wait while reclaiming */
  52         u32                     h_state;        /* pseudo-state counter */
  53         u32                     h_nsmstate;     /* true remote NSM state */
  54         u32                     h_pidcount;     /* Pseudopids */
  55         atomic_t                h_count;        /* reference count */
  56         struct semaphore        h_sema;         /* mutex for pmap binding */
  57         unsigned long           h_nextrebind;   /* next portmap call */
  58         unsigned long           h_expires;      /* eligible for GC */
  59         struct list_head        h_lockowners;   /* Lockowners for the client */
  60         spinlock_t              h_lock;
  61 };
  62
  63 /*
  64  * Map an fl_owner_t into a unique 32-bit "pid"
  65  */
  66 struct nlm_lockowner {
  67         struct list_head list;
  68         atomic_t count;
  69
  70         struct nlm_host *host;
  71         fl_owner_t owner;
  72         uint32_t pid;
  73 };
  74
  75 /*
  76  * Memory chunk for NLM client RPC request.
  77  */
  78 #define NLMCLNT_OHSIZE          (sizeof(system_utsname.nodename)+10)
  79 struct nlm_rqst {
  80         unsigned int            a_flags;        /* initial RPC task flags */
  81         struct nlm_host *       a_host;         /* host handle */
  82         struct nlm_args         a_args;         /* arguments */
  83         struct nlm_res          a_res;          /* result */
  84         char                    a_owner[NLMCLNT_OHSIZE];
  85 };
  86
  87 /*
  88  * This struct describes a file held open by lockd on behalf of
  89  * an NFS client.
  90  */
  91 struct nlm_file {
  92         struct nlm_file *       f_next;         /* linked list */
  93         struct nfs_fh           f_handle;       /* NFS file handle */
  94         struct file *           f_file;         /* VFS file pointer */
  95         struct nlm_share *      f_shares;       /* DOS shares */
  96         struct nlm_block *      f_blocks;       /* blocked locks */
  97         unsigned int            f_locks;        /* guesstimate # of locks */
  98         unsigned int            f_count;        /* reference count */
  99         struct semaphore        f_sema;         /* avoid concurrent access */
 100         int                     f_hash;         /* hash of f_handle */
 101 };
 102
 103 /*
 104  * This is a server block (i.e. a lock requested by some client which
 105  * couldn't be granted because of a conflicting lock).
 106  */
 107 #define NLM_NEVER               (~(unsigned long) 0)
 108 struct nlm_block {
 109         struct nlm_block *      b_next;         /* linked list (all blocks) */
 110         struct nlm_block *      b_fnext;        /* linked list (per file) */
 111         struct nlm_rqst         b_call;         /* RPC args & callback info */
 112         struct svc_serv *       b_daemon;       /* NLM service */
 113         struct nlm_host *       b_host;         /* host handle for RPC clnt */
 114         unsigned long           b_when;         /* next re-xmit */
 115         unsigned int            b_id;           /* block id */
 116         unsigned char           b_queued;       /* re-queued */
 117         unsigned char           b_granted;      /* VFS granted lock */
 118         unsigned char           b_incall;       /* doing callback */
 119         unsigned char           b_done;         /* callback complete */
 120         struct nlm_file *       b_file;         /* file in question */
 121 };
 122
 123 /*
 124  * Valid actions for nlmsvc_traverse_files
 125  */
 126 #define NLM_ACT_CHECK           0               /* check for locks */
 127 #define NLM_ACT_MARK            1               /* mark & sweep */
 128 #define NLM_ACT_UNLOCK          2               /* release all locks */
 129
 130 /*
 131  * Global variables
 132  */
 133 extern struct rpc_program       nlm_program;
 134 extern struct svc_procedure     nlmsvc_procedures[];
 135 #ifdef CONFIG_LOCKD_V4
 136 extern struct svc_procedure     nlmsvc_procedures4[];
 137 #endif
 138 extern int                      nlmsvc_grace_period;
 139 extern unsigned long            nlmsvc_timeout;
 140
 141 /*
 142  * Lockd client functions
 143  */
 144 struct nlm_rqst * nlmclnt_alloc_call(void);
 145 int               nlmclnt_block(struct nlm_host *, struct file_lock *, u32 *);
 146 int               nlmclnt_cancel(struct nlm_host *, struct file_lock *);
 147 u32               nlmclnt_grant(struct nlm_lock *);
 148 void              nlmclnt_recovery(struct nlm_host *, u32);
 149 int               nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
 150 int               nlmclnt_setgrantargs(struct nlm_rqst *, struct nlm_lock *);
 151 void              nlmclnt_freegrantargs(struct nlm_rqst *);
 152
 153 /*
 154  * Host cache
 155  */
 156 struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int);
 157 struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
 158 struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, int);
 159 struct rpc_clnt * nlm_bind_host(struct nlm_host *);
 160 void              nlm_rebind_host(struct nlm_host *);
 161 struct nlm_host * nlm_get_host(struct nlm_host *);
 162 void              nlm_release_host(struct nlm_host *);
 163 void              nlm_shutdown_hosts(void);
 164 extern struct nlm_host *nlm_find_client(void);
 165
 166
 167 /*
 168  * Server-side lock handling
 169  */
 170 int               nlmsvc_async_call(struct nlm_rqst *, u32, rpc_action);
 171 u32               nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
 172                                         struct nlm_lock *, int, struct nlm_cookie *);
 173 u32               nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
 174 u32               nlmsvc_testlock(struct nlm_file *, struct nlm_lock *,
 175                                         struct nlm_lock *);
 176 u32               nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
 177 unsigned long     nlmsvc_retry_blocked(void);
 178 int               nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
 179                                         int action);
 180 void      nlmsvc_grant_reply(struct svc_rqst *, struct nlm_cookie *, u32);
 181
 182 /*
 183  * File handling for the server personality
 184  */
 185 u32               nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
 186                                         struct nfs_fh *);
 187 void              nlm_release_file(struct nlm_file *);
 188 void              nlmsvc_mark_resources(void);
 189 void              nlmsvc_free_host_resources(struct nlm_host *);
 190 void              nlmsvc_invalidate_all(void);
 191
 192 static __inline__ struct inode *
 193 nlmsvc_file_inode(struct nlm_file *file)
 194 {
 195         return file->f_file->f_dentry->d_inode;
 196 }
 197
 198 /*
 199  * Compare two host addresses (needs modifying for ipv6)
 200  */
 201 static __inline__ int
 202 nlm_cmp_addr(struct sockaddr_in *sin1, struct sockaddr_in *sin2)
 203 {
 204         return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
 205 }
 206
 207 /*
 208  * Compare two NLM locks.
 209  * When the second lock is of type F_UNLCK, this acts like a wildcard.
 210  */
 211 static __inline__ int
 212 nlm_compare_locks(struct file_lock *fl1, struct file_lock *fl2)
 213 {
 214         return  fl1->fl_pid   == fl2->fl_pid
 215              && fl1->fl_start == fl2->fl_start
 216              && fl1->fl_end   == fl2->fl_end
 217              &&(fl1->fl_type  == fl2->fl_type || fl2->fl_type == F_UNLCK);
 218 }
 219
 220 extern struct lock_manager_operations nlmsvc_lock_operations;
 221
 222 #endif /* __KERNEL__ */
 223
 224 #endif /* LINUX_LOCKD_LOCKD_H */