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 .get_grace_period = get_nfs4_grace_period, 69 }; 70 71 void 72 nfsd_lockd_init(void) 73 { 74 dprintk("nfsd: initializing lockd\n"); 75 nlmsvc_ops = &nfsd_nlm_ops; 76 } 77 78 void 79 nfsd_lockd_shutdown(void) 80 { 81 nlmsvc_ops = NULL; 82 } 83