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Linux/fs/nfsd/lockd.c

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  1 /*
  2  * This file contains all the stubs needed when communicating with lockd.
  3  * This level of indirection is necessary so we can run nfsd+lockd without
  4  * requiring the nfs client to be compiled in/loaded, and vice versa.
  5  *
  6  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  7  */
  8 
  9 #include <linux/file.h>
 10 #include <linux/lockd/bind.h>
 11 #include "nfsd.h"
 12 #include "vfs.h"
 13 
 14 #define NFSDDBG_FACILITY                NFSDDBG_LOCKD
 15 
 16 #ifdef CONFIG_LOCKD_V4
 17 #define nlm_stale_fh    nlm4_stale_fh
 18 #define nlm_failed      nlm4_failed
 19 #else
 20 #define nlm_stale_fh    nlm_lck_denied_nolocks
 21 #define nlm_failed      nlm_lck_denied_nolocks
 22 #endif
 23 /*
 24  * Note: we hold the dentry use count while the file is open.
 25  */
 26 static __be32
 27 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
 28 {
 29         __be32          nfserr;
 30         struct svc_fh   fh;
 31 
 32         /* must initialize before using! but maxsize doesn't matter */
 33         fh_init(&fh,0);
 34         fh.fh_handle.fh_size = f->size;
 35         memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
 36         fh.fh_export = NULL;
 37 
 38         nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
 39         fh_put(&fh);
 40         /* We return nlm error codes as nlm doesn't know
 41          * about nfsd, but nfsd does know about nlm..
 42          */
 43         switch (nfserr) {
 44         case nfs_ok:
 45                 return 0;
 46         case nfserr_dropit:
 47                 return nlm_drop_reply;
 48         case nfserr_stale:
 49                 return nlm_stale_fh;
 50         default:
 51                 return nlm_failed;
 52         }
 53 }
 54 
 55 static void
 56 nlm_fclose(struct file *filp)
 57 {
 58         fput(filp);
 59 }
 60 
 61 static const struct nlmsvc_binding nfsd_nlm_ops = {
 62         .fopen          = nlm_fopen,            /* open file for locking */
 63         .fclose         = nlm_fclose,           /* close file */
 64 };
 65 
 66 void
 67 nfsd_lockd_init(void)
 68 {
 69         dprintk("nfsd: initializing lockd\n");
 70         nlmsvc_ops = &nfsd_nlm_ops;
 71 }
 72 
 73 void
 74 nfsd_lockd_shutdown(void)
 75 {
 76         nlmsvc_ops = NULL;
 77 }
 78 

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