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 #ifdef CONFIG_LOCKD_V4
  23 #define nlm_stale_fh    nlm4_stale_fh
  24 #define nlm_failed      nlm4_failed
  25 #else
  26 #define nlm_stale_fh    nlm_lck_denied_nolocks
  27 #define nlm_failed      nlm_lck_denied_nolocks
  28 #endif
  29 /*
  30  * Note: we hold the dentry use count while the file is open.
  31  */
  32 static __be32
  33 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
  34 {
  35         __be32          nfserr;
  36         struct svc_fh   fh;
  37
  38         /* must initialize before using! but maxsize doesn't matter */
  39         fh_init(&fh,0);
  40         fh.fh_handle.fh_size = f->size;
  41         memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
  42         fh.fh_export = NULL;
  43
  44         exp_readlock();
  45         nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
  46         fh_put(&fh);
  47         rqstp->rq_client = NULL;
  48         exp_readunlock();
  49         /* We return nlm error codes as nlm doesn't know
  50          * about nfsd, but nfsd does know about nlm..
  51          */
  52         switch (nfserr) {
  53         case nfs_ok:
  54                 return 0;
  55         case nfserr_dropit:
  56                 return nlm_drop_reply;
  57         case nfserr_stale:
  58                 return nlm_stale_fh;
  59         default:
  60                 return nlm_failed;
  61         }
  62 }
  63
  64 static void
  65 nlm_fclose(struct file *filp)
  66 {
  67         fput(filp);
  68 }
  69
  70 static struct nlmsvc_binding    nfsd_nlm_ops = {
  71         .fopen          = nlm_fopen,            /* open file for locking */
  72         .fclose         = nlm_fclose,           /* close file */
  73 };
  74
  75 void
  76 nfsd_lockd_init(void)
  77 {
  78         dprintk("nfsd: initializing lockd\n");
  79         nlmsvc_ops = &nfsd_nlm_ops;
  80 }
  81
  82 void
  83 nfsd_lockd_shutdown(void)
  84 {
  85         nlmsvc_ops = NULL;
  86 }