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fs/lockd/xdr4.c
7.34 KB
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/* * linux/fs/lockd/xdr4.c * * XDR support for lockd and the lock client. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no> */ #include <linux/types.h> #include <linux/sched.h> |
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#include <linux/nfs.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/stats.h> #include <linux/lockd/lockd.h> |
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#define NLMDBG_FACILITY NLMDBG_XDR static inline loff_t s64_to_loff_t(__s64 offset) { return (loff_t)offset; } static inline s64 loff_t_to_s64(loff_t offset) { s64 res; if (offset > NLM4_OFFSET_MAX) res = NLM4_OFFSET_MAX; else if (offset < -NLM4_OFFSET_MAX) res = -NLM4_OFFSET_MAX; else res = offset; return res; } /* * XDR functions for basic NLM types */ |
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static __be32 * nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c) |
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{ unsigned int len; len = ntohl(*p++); if(len==0) { c->len=4; memset(c->data, 0, 4); /* hockeypux brain damage */ } else if(len<=NLM_MAXCOOKIELEN) { c->len=len; memcpy(c->data, p, len); p+=XDR_QUADLEN(len); } else { |
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dprintk("lockd: bad cookie size %d (only cookies under " "%d bytes are supported.) ", len, NLM_MAXCOOKIELEN); |
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return NULL; } return p; } |
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static __be32 * nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c) |
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{ *p++ = htonl(c->len); memcpy(p, c->data, c->len); p+=XDR_QUADLEN(c->len); return p; } |
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static __be32 * nlm4_decode_fh(__be32 *p, struct nfs_fh *f) |
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{ memset(f->data, 0, sizeof(f->data)); f->size = ntohl(*p++); if (f->size > NFS_MAXFHSIZE) { |
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dprintk("lockd: bad fhandle size %d (should be <=%d) ", |
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f->size, NFS_MAXFHSIZE); return NULL; } memcpy(f->data, p, f->size); return p + XDR_QUADLEN(f->size); } |
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/* * Encode and decode owner handle */ |
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static __be32 * nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh) |
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{ return xdr_decode_netobj(p, oh); } |
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static __be32 * |
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nlm4_decode_lock(__be32 *p, struct nlm_lock *lock) |
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{ struct file_lock *fl = &lock->fl; |
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__u64 len, start; __s64 end; |
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if (!(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN)) || !(p = nlm4_decode_fh(p, &lock->fh)) || !(p = nlm4_decode_oh(p, &lock->oh))) return NULL; |
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lock->svid = ntohl(*p++); |
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locks_init_lock(fl); fl->fl_owner = current->files; |
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fl->fl_pid = (pid_t)lock->svid; |
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fl->fl_flags = FL_POSIX; fl->fl_type = F_RDLCK; /* as good as anything else */ p = xdr_decode_hyper(p, &start); p = xdr_decode_hyper(p, &len); end = start + len - 1; fl->fl_start = s64_to_loff_t(start); if (len == 0 || end < 0) fl->fl_end = OFFSET_MAX; else fl->fl_end = s64_to_loff_t(end); return p; } /* |
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* Encode result of a TEST/TEST_MSG call */ |
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static __be32 * nlm4_encode_testres(__be32 *p, struct nlm_res *resp) |
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{ s64 start, len; dprintk("xdr: before encode_testres (p %p resp %p) ", p, resp); if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return NULL; *p++ = resp->status; if (resp->status == nlm_lck_denied) { struct file_lock *fl = &resp->lock.fl; *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; |
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*p++ = htonl(resp->lock.svid); |
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/* Encode owner handle. */ if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) return NULL; start = loff_t_to_s64(fl->fl_start); if (fl->fl_end == OFFSET_MAX) len = 0; else len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); p = xdr_encode_hyper(p, start); p = xdr_encode_hyper(p, len); |
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dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld) ", resp->status, (int)resp->lock.svid, fl->fl_type, |
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(long long)fl->fl_start, (long long)fl->fl_end); } dprintk("xdr: after encode_testres (p %p resp %p) ", p, resp); return p; } /* * First, the server side XDR functions */ int |
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nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
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{ u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
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{ if (!(p = nlm4_encode_testres(p, resp))) return 0; return xdr_ressize_check(rqstp, p); } int |
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nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
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{ u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; argp->block = ntohl(*p++); exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; argp->reclaim = ntohl(*p++); argp->state = ntohl(*p++); argp->monitor = 1; /* monitor client by default */ return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
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{ u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; argp->block = ntohl(*p++); exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
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{ if (!(p = nlm4_decode_cookie(p, &argp->cookie)) || !(p = nlm4_decode_lock(p, &argp->lock))) return 0; argp->lock.fl.fl_type = F_UNLCK; return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
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{ struct nlm_lock *lock = &argp->lock; memset(lock, 0, sizeof(*lock)); locks_init_lock(&lock->fl); |
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lock->svid = ~(u32) 0; lock->fl.fl_pid = (pid_t)lock->svid; |
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if (!(p = nlm4_decode_cookie(p, &argp->cookie)) || !(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN)) || !(p = nlm4_decode_fh(p, &lock->fh)) || !(p = nlm4_decode_oh(p, &lock->oh))) return 0; argp->fsm_mode = ntohl(*p++); argp->fsm_access = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
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{ if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return 0; *p++ = resp->status; *p++ = xdr_zero; /* sequence argument */ return xdr_ressize_check(rqstp, p); } int |
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nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
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{ if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return 0; *p++ = resp->status; return xdr_ressize_check(rqstp, p); } int |
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nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp) |
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{ struct nlm_lock *lock = &argp->lock; if (!(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN))) return 0; argp->state = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp) |
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{ if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) return 0; argp->state = ntohl(*p++); |
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memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); p += XDR_QUADLEN(SM_PRIV_SIZE); |
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return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
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{ if (!(p = nlm4_decode_cookie(p, &resp->cookie))) return 0; |
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resp->status = *p++; |
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return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
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{ return xdr_argsize_check(rqstp, p); } int |
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nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
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{ return xdr_ressize_check(rqstp, p); } |