lockd.c

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    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/sunrpc/clnt.h>
   13 #include <linux/sunrpc/svc.h>
   14 #include <linux/nfsd/nfsd.h>
   15 #include <linux/lockd/bind.h>
   16 
   17 #define NFSDDBG_FACILITY                NFSDDBG_LOCKD
   18 
   19 /*
   20  * Note: we hold the dentry use count while the file is open.
   21  */
   22 static u32
   23 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file *filp)
   24 {
   25         u32             nfserr;
   26         struct svc_fh   fh;
   27 
   28         /* must initialize before using! but maxsize doesn't matter */
   29         fh_init(&fh,0);
   30         fh.fh_handle.fh_size = f->size;
   31         memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
   32         fh.fh_export = NULL;
   33 
   34         nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);
   35         if (!nfserr) {
   36                 dget(filp->f_dentry);
   37                 mntget(filp->f_vfsmnt);
   38         }
   39         fh_put(&fh);
   40         /* nlm and nfsd don't share error codes.
   41          * we invent: 0 = no error
   42          *            1 = stale file handle
   43          *            2 = other error
   44          */
   45         switch (nfserr) {
   46         case nfs_ok:
   47                 return 0;
   48         case nfserr_stale:
   49                 return 1;
   50         default:
   51                 return 2;
   52         }
   53 }
   54 
   55 static void
   56 nlm_fclose(struct file *filp)
   57 {
   58         nfsd_close(filp);
   59         dput(filp->f_dentry);
   60         mntput(filp->f_vfsmnt);
   61 }
   62 
   63 struct nlmsvc_binding           nfsd_nlm_ops = {
   64         exp_readlock,           /* lock export table for reading */
   65         exp_unlock,             /* unlock export table */
   66         exp_getclient,          /* look up NFS client */
   67         nlm_fopen,              /* open file for locking */
   68         nlm_fclose,             /* close file */
   69         exp_nlmdetach,          /* lockd shutdown notification */
   70 };
   71 
   72 /*
   73  * When removing an NFS client entry, notify lockd that it is gone.
   74  * FIXME: We should do the same when unexporting an NFS volume.
   75  */
   76 void
   77 nfsd_lockd_unexport(struct svc_client *clnt)
   78 {
   79         nlmsvc_invalidate_client(clnt);
   80 }
   81 
   82 void
   83 nfsd_lockd_init(void)
   84 {
   85         dprintk("nfsd: initializing lockd\n");
   86         nlmsvc_ops = &nfsd_nlm_ops;
   87 }
   88 
   89 void
   90 nfsd_lockd_shutdown(void)
   91 {
   92         nlmsvc_ops = NULL;
   93 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/nfsd/lockd.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsd/lockd.c