1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file contains all the stubs needed when communicating with lockd. 4 * This level of indirection is necessary so we can run nfsd+lockd without 5 * requiring the nfs client to be compiled in/loaded, and vice versa. 6 * 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #include <linux/file.h> 11 #include <linux/lockd/bind.h> 12 #include "nfsd.h" 13 #include "vfs.h" 14 15 #define NFSDDBG_FACILITY NFSDDBG_LOCKD 16 17 #ifdef CONFIG_LOCKD_V4 18 #define nlm_stale_fh nlm4_stale_fh 19 #define nlm_failed nlm4_failed 20 #else 21 #define nlm_stale_fh nlm_lck_denied_nolocks 22 #define nlm_failed nlm_lck_denied_nolocks 23 #endif 24 /* 25 * Note: we hold the dentry use count while the file is open. 26 */ 27 static __be32 28 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp) 29 { 30 __be32 nfserr; 31 struct svc_fh fh; 32 33 /* must initialize before using! but maxsize doesn't matter */ 34 fh_init(&fh,0); 35 fh.fh_handle.fh_size = f->size; 36 memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size); 37 fh.fh_export = NULL; 38 39 nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp); 40 fh_put(&fh); 41 /* We return nlm error codes as nlm doesn't know 42 * about nfsd, but nfsd does know about nlm.. 43 */ 44 switch (nfserr) { 45 case nfs_ok: 46 return 0; 47 case nfserr_dropit: 48 return nlm_drop_reply; 49 case nfserr_stale: 50 return nlm_stale_fh; 51 default: 52 return nlm_failed; 53 } 54 } 55 56 static void 57 nlm_fclose(struct file *filp) 58 { 59 fput(filp); 60 } 61 62 static const struct nlmsvc_binding nfsd_nlm_ops = { 63 .fopen = nlm_fopen, /* open file for locking */ 64 .fclose = nlm_fclose, /* close file */ 65 }; 66 67 void 68 nfsd_lockd_init(void) 69 { 70 dprintk("nfsd: initializing lockd\n"); 71 nlmsvc_ops = &nfsd_nlm_ops; 72 } 73 74 void 75 nfsd_lockd_shutdown(void) 76 { 77 nlmsvc_ops = NULL; 78 } 79