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 int mode) 30 { 31 __be32 nfserr; 32 int access; 33 struct svc_fh fh; 34 35 /* must initialize before using! but maxsize doesn't matter */ 36 fh_init(&fh,0); 37 fh.fh_handle.fh_size = f->size; 38 memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size); 39 fh.fh_export = NULL; 40 41 access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ; 42 access |= NFSD_MAY_LOCK; 43 nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp); 44 fh_put(&fh); 45 /* We return nlm error codes as nlm doesn't know 46 * about nfsd, but nfsd does know about nlm.. 47 */ 48 switch (nfserr) { 49 case nfs_ok: 50 return 0; 51 case nfserr_dropit: 52 return nlm_drop_reply; 53 case nfserr_stale: 54 return nlm_stale_fh; 55 default: 56 return nlm_failed; 57 } 58 } 59 60 static void 61 nlm_fclose(struct file *filp) 62 { 63 fput(filp); 64 } 65 66 static const struct nlmsvc_binding nfsd_nlm_ops = { 67 .fopen = nlm_fopen, /* open file for locking */ 68 .fclose = nlm_fclose, /* close file */ 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