release/src-rt-6.x/linux/linux-2.6/fs/nfsd/lockd.c

   1 /*
   2  * linux/fs/nfsd/lockd.c
   3  *
   4  * This file contains all the stubs needed when communicating with lockd.
   5  * This level of indirection is necessary so we can run nfsd+lockd without
   6  * requiring the nfs client to be compiled in/loaded, and vice versa.
   7  *
   8  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/fs.h>
  13 #include <linux/file.h>
  14 #include <linux/mount.h>
  15 #include <linux/sunrpc/clnt.h>
  16 #include <linux/sunrpc/svc.h>
  17 #include <linux/nfsd/nfsd.h>
  18 #include <linux/lockd/bind.h>
  19
  20 #define NFSDDBG_FACILITY                NFSDDBG_LOCKD
  21
  22 /*
  23  * Note: we hold the dentry use count while the file is open.
  24  */
  25 static __be32
  26 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
  27 {
  28         __be32          nfserr;
  29         struct svc_fh   fh;
  30
  31         /* must initialize before using! but maxsize doesn't matter */
  32         fh_init(&fh,0);
  33         fh.fh_handle.fh_size = f->size;
  34         memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
  35         fh.fh_export = NULL;
  36
  37         exp_readlock();
  38         nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);
  39         fh_put(&fh);
  40         rqstp->rq_client = NULL;
  41         exp_readunlock();
  42         /* We return nlm error codes as nlm doesn't know
  43          * about nfsd, but nfsd does know about nlm..
  44          */
  45         switch (nfserr) {
  46         case nfs_ok:
  47                 return 0;
  48         case nfserr_dropit:
  49                 return nlm_drop_reply;
  50 #ifdef CONFIG_LOCKD_V4
  51         case nfserr_stale:
  52                 return nlm4_stale_fh;
  53 #endif
  54         default:
  55                 return nlm_lck_denied;
  56         }
  57 }
  58
  59 static void
  60 nlm_fclose(struct file *filp)
  61 {
  62         fput(filp);
  63 }
  64
  65 static struct nlmsvc_binding    nfsd_nlm_ops = {
  66         .fopen          = nlm_fopen,            /* open file for locking */
  67         .fclose         = nlm_fclose,           /* close file */
  68 };
  69
  70 void
  71 nfsd_lockd_init(void)
  72 {
  73         dprintk("nfsd: initializing lockd\n");
  74         nlmsvc_ops = &nfsd_nlm_ops;
  75 }
  76
  77 void
  78 nfsd_lockd_shutdown(void)
  79 {
  80         nlmsvc_ops = NULL;
  81 }