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 u32 26 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp) 27 { 28 u32 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 /* nlm and nfsd don't share error codes. 43 * we invent: 0 = no error 44 * 1 = stale file handle 45 * 2 = other error 46 */ 47 switch (nfserr) { 48 case nfs_ok: 49 return 0; 50 case nfserr_stale: 51 return 1; 52 default: 53 return 2; 54 } 55 } 56 57 static void 58 nlm_fclose(struct file *filp) 59 { 60 fput(filp); 61 } 62 63 static struct nlmsvc_binding nfsd_nlm_ops = { 64 .fopen = nlm_fopen, /* open file for locking */ 65 .fclose = nlm_fclose, /* close file */ 66 }; 67 68 void 69 nfsd_lockd_init(void) 70 { 71 dprintk("nfsd: initializing lockd\n"); 72 nlmsvc_ops = &nfsd_nlm_ops; 73 } 74 75 void 76 nfsd_lockd_shutdown(void) 77 { 78 nlmsvc_ops = NULL; 79 } 80