Root/fs/nfsd/nfs4xdr.c

1/*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * TODO: Neil Brown made the following observation: We currently
36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
37 * never release any of that until the request is complete.
38 * It would be good to calculate a new maximum response size while
39 * decoding the COMPOUND, and call svc_reserve with this number
40 * at the end of nfs4svc_decode_compoundargs.
41 */
42
43#include <linux/slab.h>
44#include <linux/namei.h>
45#include <linux/statfs.h>
46#include <linux/utsname.h>
47#include <linux/sunrpc/svcauth_gss.h>
48
49#include "idmap.h"
50#include "acl.h"
51#include "xdr4.h"
52#include "vfs.h"
53
54
55#define NFSDDBG_FACILITY NFSDDBG_XDR
56
57/*
58 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
59 * directory in order to indicate to the client that a filesystem boundary is present
60 * We use a fixed fsid for a referral
61 */
62#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
63#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
64
65static __be32
66check_filename(char *str, int len, __be32 err)
67{
68    int i;
69
70    if (len == 0)
71        return nfserr_inval;
72    if (isdotent(str, len))
73        return err;
74    for (i = 0; i < len; i++)
75        if (str[i] == '/')
76            return err;
77    return 0;
78}
79
80#define DECODE_HEAD \
81    __be32 *p; \
82    __be32 status
83#define DECODE_TAIL \
84    status = 0; \
85out: \
86    return status; \
87xdr_error: \
88    dprintk("NFSD: xdr error (%s:%d)\n", \
89            __FILE__, __LINE__); \
90    status = nfserr_bad_xdr; \
91    goto out
92
93#define READ32(x) (x) = ntohl(*p++)
94#define READ64(x) do { \
95    (x) = (u64)ntohl(*p++) << 32; \
96    (x) |= ntohl(*p++); \
97} while (0)
98#define READTIME(x) do { \
99    p++; \
100    (x) = ntohl(*p++); \
101    p++; \
102} while (0)
103#define READMEM(x,nbytes) do { \
104    x = (char *)p; \
105    p += XDR_QUADLEN(nbytes); \
106} while (0)
107#define SAVEMEM(x,nbytes) do { \
108    if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
109         savemem(argp, p, nbytes) : \
110         (char *)p)) { \
111        dprintk("NFSD: xdr error (%s:%d)\n", \
112                __FILE__, __LINE__); \
113        goto xdr_error; \
114        } \
115    p += XDR_QUADLEN(nbytes); \
116} while (0)
117#define COPYMEM(x,nbytes) do { \
118    memcpy((x), p, nbytes); \
119    p += XDR_QUADLEN(nbytes); \
120} while (0)
121
122/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
123#define READ_BUF(nbytes) do { \
124    if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
125        p = argp->p; \
126        argp->p += XDR_QUADLEN(nbytes); \
127    } else if (!(p = read_buf(argp, nbytes))) { \
128        dprintk("NFSD: xdr error (%s:%d)\n", \
129                __FILE__, __LINE__); \
130        goto xdr_error; \
131    } \
132} while (0)
133
134static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
135{
136    /* We want more bytes than seem to be available.
137     * Maybe we need a new page, maybe we have just run out
138     */
139    unsigned int avail = (char *)argp->end - (char *)argp->p;
140    __be32 *p;
141    if (avail + argp->pagelen < nbytes)
142        return NULL;
143    if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
144        return NULL;
145    /* ok, we can do it with the current plus the next page */
146    if (nbytes <= sizeof(argp->tmp))
147        p = argp->tmp;
148    else {
149        kfree(argp->tmpp);
150        p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
151        if (!p)
152            return NULL;
153        
154    }
155    /*
156     * The following memcpy is safe because read_buf is always
157     * called with nbytes > avail, and the two cases above both
158     * guarantee p points to at least nbytes bytes.
159     */
160    memcpy(p, argp->p, avail);
161    /* step to next page */
162    argp->p = page_address(argp->pagelist[0]);
163    argp->pagelist++;
164    if (argp->pagelen < PAGE_SIZE) {
165        argp->end = argp->p + (argp->pagelen>>2);
166        argp->pagelen = 0;
167    } else {
168        argp->end = argp->p + (PAGE_SIZE>>2);
169        argp->pagelen -= PAGE_SIZE;
170    }
171    memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
172    argp->p += XDR_QUADLEN(nbytes - avail);
173    return p;
174}
175
176static int zero_clientid(clientid_t *clid)
177{
178    return (clid->cl_boot == 0) && (clid->cl_id == 0);
179}
180
181static int
182defer_free(struct nfsd4_compoundargs *argp,
183        void (*release)(const void *), void *p)
184{
185    struct tmpbuf *tb;
186
187    tb = kmalloc(sizeof(*tb), GFP_KERNEL);
188    if (!tb)
189        return -ENOMEM;
190    tb->buf = p;
191    tb->release = release;
192    tb->next = argp->to_free;
193    argp->to_free = tb;
194    return 0;
195}
196
197static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
198{
199    if (p == argp->tmp) {
200        p = kmalloc(nbytes, GFP_KERNEL);
201        if (!p)
202            return NULL;
203        memcpy(p, argp->tmp, nbytes);
204    } else {
205        BUG_ON(p != argp->tmpp);
206        argp->tmpp = NULL;
207    }
208    if (defer_free(argp, kfree, p)) {
209        kfree(p);
210        return NULL;
211    } else
212        return (char *)p;
213}
214
215static __be32
216nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
217{
218    u32 bmlen;
219    DECODE_HEAD;
220
221    bmval[0] = 0;
222    bmval[1] = 0;
223    bmval[2] = 0;
224
225    READ_BUF(4);
226    READ32(bmlen);
227    if (bmlen > 1000)
228        goto xdr_error;
229
230    READ_BUF(bmlen << 2);
231    if (bmlen > 0)
232        READ32(bmval[0]);
233    if (bmlen > 1)
234        READ32(bmval[1]);
235    if (bmlen > 2)
236        READ32(bmval[2]);
237
238    DECODE_TAIL;
239}
240
241static __be32
242nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
243           struct iattr *iattr, struct nfs4_acl **acl)
244{
245    int expected_len, len = 0;
246    u32 dummy32;
247    char *buf;
248    int host_err;
249
250    DECODE_HEAD;
251    iattr->ia_valid = 0;
252    if ((status = nfsd4_decode_bitmap(argp, bmval)))
253        return status;
254
255    READ_BUF(4);
256    READ32(expected_len);
257
258    if (bmval[0] & FATTR4_WORD0_SIZE) {
259        READ_BUF(8);
260        len += 8;
261        READ64(iattr->ia_size);
262        iattr->ia_valid |= ATTR_SIZE;
263    }
264    if (bmval[0] & FATTR4_WORD0_ACL) {
265        int nace;
266        struct nfs4_ace *ace;
267
268        READ_BUF(4); len += 4;
269        READ32(nace);
270
271        if (nace > NFS4_ACL_MAX)
272            return nfserr_resource;
273
274        *acl = nfs4_acl_new(nace);
275        if (*acl == NULL) {
276            host_err = -ENOMEM;
277            goto out_nfserr;
278        }
279        defer_free(argp, kfree, *acl);
280
281        (*acl)->naces = nace;
282        for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
283            READ_BUF(16); len += 16;
284            READ32(ace->type);
285            READ32(ace->flag);
286            READ32(ace->access_mask);
287            READ32(dummy32);
288            READ_BUF(dummy32);
289            len += XDR_QUADLEN(dummy32) << 2;
290            READMEM(buf, dummy32);
291            ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
292            status = nfs_ok;
293            if (ace->whotype != NFS4_ACL_WHO_NAMED)
294                ace->who = 0;
295            else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
296                status = nfsd_map_name_to_gid(argp->rqstp,
297                        buf, dummy32, &ace->who);
298            else
299                status = nfsd_map_name_to_uid(argp->rqstp,
300                        buf, dummy32, &ace->who);
301            if (status)
302                return status;
303        }
304    } else
305        *acl = NULL;
306    if (bmval[1] & FATTR4_WORD1_MODE) {
307        READ_BUF(4);
308        len += 4;
309        READ32(iattr->ia_mode);
310        iattr->ia_mode &= (S_IFMT | S_IALLUGO);
311        iattr->ia_valid |= ATTR_MODE;
312    }
313    if (bmval[1] & FATTR4_WORD1_OWNER) {
314        READ_BUF(4);
315        len += 4;
316        READ32(dummy32);
317        READ_BUF(dummy32);
318        len += (XDR_QUADLEN(dummy32) << 2);
319        READMEM(buf, dummy32);
320        if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
321            return status;
322        iattr->ia_valid |= ATTR_UID;
323    }
324    if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
325        READ_BUF(4);
326        len += 4;
327        READ32(dummy32);
328        READ_BUF(dummy32);
329        len += (XDR_QUADLEN(dummy32) << 2);
330        READMEM(buf, dummy32);
331        if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
332            return status;
333        iattr->ia_valid |= ATTR_GID;
334    }
335    if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
336        READ_BUF(4);
337        len += 4;
338        READ32(dummy32);
339        switch (dummy32) {
340        case NFS4_SET_TO_CLIENT_TIME:
341            /* We require the high 32 bits of 'seconds' to be 0, and we ignore
342               all 32 bits of 'nseconds'. */
343            READ_BUF(12);
344            len += 12;
345            READ32(dummy32);
346            if (dummy32)
347                return nfserr_inval;
348            READ32(iattr->ia_atime.tv_sec);
349            READ32(iattr->ia_atime.tv_nsec);
350            if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
351                return nfserr_inval;
352            iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
353            break;
354        case NFS4_SET_TO_SERVER_TIME:
355            iattr->ia_valid |= ATTR_ATIME;
356            break;
357        default:
358            goto xdr_error;
359        }
360    }
361    if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
362        READ_BUF(4);
363        len += 4;
364        READ32(dummy32);
365        switch (dummy32) {
366        case NFS4_SET_TO_CLIENT_TIME:
367            /* We require the high 32 bits of 'seconds' to be 0, and we ignore
368               all 32 bits of 'nseconds'. */
369            READ_BUF(12);
370            len += 12;
371            READ32(dummy32);
372            if (dummy32)
373                return nfserr_inval;
374            READ32(iattr->ia_mtime.tv_sec);
375            READ32(iattr->ia_mtime.tv_nsec);
376            if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
377                return nfserr_inval;
378            iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
379            break;
380        case NFS4_SET_TO_SERVER_TIME:
381            iattr->ia_valid |= ATTR_MTIME;
382            break;
383        default:
384            goto xdr_error;
385        }
386    }
387    if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
388        || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
389        || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
390        READ_BUF(expected_len - len);
391    else if (len != expected_len)
392        goto xdr_error;
393
394    DECODE_TAIL;
395
396out_nfserr:
397    status = nfserrno(host_err);
398    goto out;
399}
400
401static __be32
402nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
403{
404    DECODE_HEAD;
405
406    READ_BUF(sizeof(stateid_t));
407    READ32(sid->si_generation);
408    COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
409
410    DECODE_TAIL;
411}
412
413static __be32
414nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
415{
416    DECODE_HEAD;
417
418    READ_BUF(4);
419    READ32(access->ac_req_access);
420
421    DECODE_TAIL;
422}
423
424static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
425{
426    DECODE_HEAD;
427
428    READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
429    COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
430    READ32(bcts->dir);
431    /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
432     * could help us figure out we should be using it. */
433    DECODE_TAIL;
434}
435
436static __be32
437nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
438{
439    DECODE_HEAD;
440
441    close->cl_stateowner = NULL;
442    READ_BUF(4);
443    READ32(close->cl_seqid);
444    return nfsd4_decode_stateid(argp, &close->cl_stateid);
445
446    DECODE_TAIL;
447}
448
449
450static __be32
451nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
452{
453    DECODE_HEAD;
454
455    READ_BUF(12);
456    READ64(commit->co_offset);
457    READ32(commit->co_count);
458
459    DECODE_TAIL;
460}
461
462static __be32
463nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
464{
465    DECODE_HEAD;
466
467    READ_BUF(4);
468    READ32(create->cr_type);
469    switch (create->cr_type) {
470    case NF4LNK:
471        READ_BUF(4);
472        READ32(create->cr_linklen);
473        READ_BUF(create->cr_linklen);
474        SAVEMEM(create->cr_linkname, create->cr_linklen);
475        break;
476    case NF4BLK:
477    case NF4CHR:
478        READ_BUF(8);
479        READ32(create->cr_specdata1);
480        READ32(create->cr_specdata2);
481        break;
482    case NF4SOCK:
483    case NF4FIFO:
484    case NF4DIR:
485    default:
486        break;
487    }
488
489    READ_BUF(4);
490    READ32(create->cr_namelen);
491    READ_BUF(create->cr_namelen);
492    SAVEMEM(create->cr_name, create->cr_namelen);
493    if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
494        return status;
495
496    status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
497                    &create->cr_acl);
498    if (status)
499        goto out;
500
501    DECODE_TAIL;
502}
503
504static inline __be32
505nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
506{
507    return nfsd4_decode_stateid(argp, &dr->dr_stateid);
508}
509
510static inline __be32
511nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
512{
513    return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
514}
515
516static __be32
517nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
518{
519    DECODE_HEAD;
520
521    READ_BUF(4);
522    READ32(link->li_namelen);
523    READ_BUF(link->li_namelen);
524    SAVEMEM(link->li_name, link->li_namelen);
525    if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
526        return status;
527
528    DECODE_TAIL;
529}
530
531static __be32
532nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
533{
534    DECODE_HEAD;
535
536    lock->lk_replay_owner = NULL;
537    /*
538    * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
539    */
540    READ_BUF(28);
541    READ32(lock->lk_type);
542    if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
543        goto xdr_error;
544    READ32(lock->lk_reclaim);
545    READ64(lock->lk_offset);
546    READ64(lock->lk_length);
547    READ32(lock->lk_is_new);
548
549    if (lock->lk_is_new) {
550        READ_BUF(4);
551        READ32(lock->lk_new_open_seqid);
552        status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
553        if (status)
554            return status;
555        READ_BUF(8 + sizeof(clientid_t));
556        READ32(lock->lk_new_lock_seqid);
557        COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
558        READ32(lock->lk_new_owner.len);
559        READ_BUF(lock->lk_new_owner.len);
560        READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
561    } else {
562        status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
563        if (status)
564            return status;
565        READ_BUF(4);
566        READ32(lock->lk_old_lock_seqid);
567    }
568
569    DECODE_TAIL;
570}
571
572static __be32
573nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
574{
575    DECODE_HEAD;
576                
577    READ_BUF(32);
578    READ32(lockt->lt_type);
579    if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
580        goto xdr_error;
581    READ64(lockt->lt_offset);
582    READ64(lockt->lt_length);
583    COPYMEM(&lockt->lt_clientid, 8);
584    READ32(lockt->lt_owner.len);
585    READ_BUF(lockt->lt_owner.len);
586    READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
587
588    DECODE_TAIL;
589}
590
591static __be32
592nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
593{
594    DECODE_HEAD;
595
596    locku->lu_stateowner = NULL;
597    READ_BUF(8);
598    READ32(locku->lu_type);
599    if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
600        goto xdr_error;
601    READ32(locku->lu_seqid);
602    status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
603    if (status)
604        return status;
605    READ_BUF(16);
606    READ64(locku->lu_offset);
607    READ64(locku->lu_length);
608
609    DECODE_TAIL;
610}
611
612static __be32
613nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
614{
615    DECODE_HEAD;
616
617    READ_BUF(4);
618    READ32(lookup->lo_len);
619    READ_BUF(lookup->lo_len);
620    SAVEMEM(lookup->lo_name, lookup->lo_len);
621    if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
622        return status;
623
624    DECODE_TAIL;
625}
626
627static __be32
628nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
629{
630    DECODE_HEAD;
631
632    memset(open->op_bmval, 0, sizeof(open->op_bmval));
633    open->op_iattr.ia_valid = 0;
634    open->op_stateowner = NULL;
635
636    /* seqid, share_access, share_deny, clientid, ownerlen */
637    READ_BUF(16 + sizeof(clientid_t));
638    READ32(open->op_seqid);
639    READ32(open->op_share_access);
640    READ32(open->op_share_deny);
641    COPYMEM(&open->op_clientid, sizeof(clientid_t));
642    READ32(open->op_owner.len);
643
644    /* owner, open_flag */
645    READ_BUF(open->op_owner.len + 4);
646    SAVEMEM(open->op_owner.data, open->op_owner.len);
647    READ32(open->op_create);
648    switch (open->op_create) {
649    case NFS4_OPEN_NOCREATE:
650        break;
651    case NFS4_OPEN_CREATE:
652        READ_BUF(4);
653        READ32(open->op_createmode);
654        switch (open->op_createmode) {
655        case NFS4_CREATE_UNCHECKED:
656        case NFS4_CREATE_GUARDED:
657            status = nfsd4_decode_fattr(argp, open->op_bmval,
658                &open->op_iattr, &open->op_acl);
659            if (status)
660                goto out;
661            break;
662        case NFS4_CREATE_EXCLUSIVE:
663            READ_BUF(8);
664            COPYMEM(open->op_verf.data, 8);
665            break;
666        case NFS4_CREATE_EXCLUSIVE4_1:
667            if (argp->minorversion < 1)
668                goto xdr_error;
669            READ_BUF(8);
670            COPYMEM(open->op_verf.data, 8);
671            status = nfsd4_decode_fattr(argp, open->op_bmval,
672                &open->op_iattr, &open->op_acl);
673            if (status)
674                goto out;
675            break;
676        default:
677            goto xdr_error;
678        }
679        break;
680    default:
681        goto xdr_error;
682    }
683
684    /* open_claim */
685    READ_BUF(4);
686    READ32(open->op_claim_type);
687    switch (open->op_claim_type) {
688    case NFS4_OPEN_CLAIM_NULL:
689    case NFS4_OPEN_CLAIM_DELEGATE_PREV:
690        READ_BUF(4);
691        READ32(open->op_fname.len);
692        READ_BUF(open->op_fname.len);
693        SAVEMEM(open->op_fname.data, open->op_fname.len);
694        if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
695            return status;
696        break;
697    case NFS4_OPEN_CLAIM_PREVIOUS:
698        READ_BUF(4);
699        READ32(open->op_delegate_type);
700        break;
701    case NFS4_OPEN_CLAIM_DELEGATE_CUR:
702        status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
703        if (status)
704            return status;
705        READ_BUF(4);
706        READ32(open->op_fname.len);
707        READ_BUF(open->op_fname.len);
708        SAVEMEM(open->op_fname.data, open->op_fname.len);
709        if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
710            return status;
711        break;
712    default:
713        goto xdr_error;
714    }
715
716    DECODE_TAIL;
717}
718
719static __be32
720nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
721{
722    DECODE_HEAD;
723            
724    open_conf->oc_stateowner = NULL;
725    status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
726    if (status)
727        return status;
728    READ_BUF(4);
729    READ32(open_conf->oc_seqid);
730                                
731    DECODE_TAIL;
732}
733
734static __be32
735nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
736{
737    DECODE_HEAD;
738            
739    open_down->od_stateowner = NULL;
740    status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
741    if (status)
742        return status;
743    READ_BUF(12);
744    READ32(open_down->od_seqid);
745    READ32(open_down->od_share_access);
746    READ32(open_down->od_share_deny);
747                                
748    DECODE_TAIL;
749}
750
751static __be32
752nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
753{
754    DECODE_HEAD;
755
756    READ_BUF(4);
757    READ32(putfh->pf_fhlen);
758    if (putfh->pf_fhlen > NFS4_FHSIZE)
759        goto xdr_error;
760    READ_BUF(putfh->pf_fhlen);
761    SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
762
763    DECODE_TAIL;
764}
765
766static __be32
767nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
768{
769    DECODE_HEAD;
770
771    status = nfsd4_decode_stateid(argp, &read->rd_stateid);
772    if (status)
773        return status;
774    READ_BUF(12);
775    READ64(read->rd_offset);
776    READ32(read->rd_length);
777
778    DECODE_TAIL;
779}
780
781static __be32
782nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
783{
784    DECODE_HEAD;
785
786    READ_BUF(24);
787    READ64(readdir->rd_cookie);
788    COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
789    READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
790    READ32(readdir->rd_maxcount);
791    if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
792        goto out;
793
794    DECODE_TAIL;
795}
796
797static __be32
798nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
799{
800    DECODE_HEAD;
801
802    READ_BUF(4);
803    READ32(remove->rm_namelen);
804    READ_BUF(remove->rm_namelen);
805    SAVEMEM(remove->rm_name, remove->rm_namelen);
806    if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
807        return status;
808
809    DECODE_TAIL;
810}
811
812static __be32
813nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
814{
815    DECODE_HEAD;
816
817    READ_BUF(4);
818    READ32(rename->rn_snamelen);
819    READ_BUF(rename->rn_snamelen + 4);
820    SAVEMEM(rename->rn_sname, rename->rn_snamelen);
821    READ32(rename->rn_tnamelen);
822    READ_BUF(rename->rn_tnamelen);
823    SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
824    if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
825        return status;
826    if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
827        return status;
828
829    DECODE_TAIL;
830}
831
832static __be32
833nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
834{
835    DECODE_HEAD;
836
837    READ_BUF(sizeof(clientid_t));
838    COPYMEM(clientid, sizeof(clientid_t));
839
840    DECODE_TAIL;
841}
842
843static __be32
844nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
845             struct nfsd4_secinfo *secinfo)
846{
847    DECODE_HEAD;
848
849    READ_BUF(4);
850    READ32(secinfo->si_namelen);
851    READ_BUF(secinfo->si_namelen);
852    SAVEMEM(secinfo->si_name, secinfo->si_namelen);
853    status = check_filename(secinfo->si_name, secinfo->si_namelen,
854                                nfserr_noent);
855    if (status)
856        return status;
857    DECODE_TAIL;
858}
859
860static __be32
861nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
862             struct nfsd4_secinfo_no_name *sin)
863{
864    DECODE_HEAD;
865
866    READ_BUF(4);
867    READ32(sin->sin_style);
868    DECODE_TAIL;
869}
870
871static __be32
872nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
873{
874    __be32 status;
875
876    status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
877    if (status)
878        return status;
879    return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
880                  &setattr->sa_acl);
881}
882
883static __be32
884nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
885{
886    DECODE_HEAD;
887
888    READ_BUF(12);
889    COPYMEM(setclientid->se_verf.data, 8);
890    READ32(setclientid->se_namelen);
891
892    READ_BUF(setclientid->se_namelen + 8);
893    SAVEMEM(setclientid->se_name, setclientid->se_namelen);
894    READ32(setclientid->se_callback_prog);
895    READ32(setclientid->se_callback_netid_len);
896
897    READ_BUF(setclientid->se_callback_netid_len + 4);
898    SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
899    READ32(setclientid->se_callback_addr_len);
900
901    READ_BUF(setclientid->se_callback_addr_len + 4);
902    SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
903    READ32(setclientid->se_callback_ident);
904
905    DECODE_TAIL;
906}
907
908static __be32
909nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
910{
911    DECODE_HEAD;
912
913    READ_BUF(8 + sizeof(nfs4_verifier));
914    COPYMEM(&scd_c->sc_clientid, 8);
915    COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
916
917    DECODE_TAIL;
918}
919
920/* Also used for NVERIFY */
921static __be32
922nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
923{
924#if 0
925    struct nfsd4_compoundargs save = {
926        .p = argp->p,
927        .end = argp->end,
928        .rqstp = argp->rqstp,
929    };
930    u32 ve_bmval[2];
931    struct iattr ve_iattr; /* request */
932    struct nfs4_acl *ve_acl; /* request */
933#endif
934    DECODE_HEAD;
935
936    if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
937        goto out;
938
939    /* For convenience's sake, we compare raw xdr'd attributes in
940     * nfsd4_proc_verify; however we still decode here just to return
941     * correct error in case of bad xdr. */
942#if 0
943    status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
944    if (status == nfserr_inval) {
945        status = nfserrno(status);
946        goto out;
947    }
948#endif
949    READ_BUF(4);
950    READ32(verify->ve_attrlen);
951    READ_BUF(verify->ve_attrlen);
952    SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
953
954    DECODE_TAIL;
955}
956
957static __be32
958nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
959{
960    int avail;
961    int v;
962    int len;
963    DECODE_HEAD;
964
965    status = nfsd4_decode_stateid(argp, &write->wr_stateid);
966    if (status)
967        return status;
968    READ_BUF(16);
969    READ64(write->wr_offset);
970    READ32(write->wr_stable_how);
971    if (write->wr_stable_how > 2)
972        goto xdr_error;
973    READ32(write->wr_buflen);
974
975    /* Sorry .. no magic macros for this.. *
976     * READ_BUF(write->wr_buflen);
977     * SAVEMEM(write->wr_buf, write->wr_buflen);
978     */
979    avail = (char*)argp->end - (char*)argp->p;
980    if (avail + argp->pagelen < write->wr_buflen) {
981        dprintk("NFSD: xdr error (%s:%d)\n",
982                __FILE__, __LINE__);
983        goto xdr_error;
984    }
985    argp->rqstp->rq_vec[0].iov_base = p;
986    argp->rqstp->rq_vec[0].iov_len = avail;
987    v = 0;
988    len = write->wr_buflen;
989    while (len > argp->rqstp->rq_vec[v].iov_len) {
990        len -= argp->rqstp->rq_vec[v].iov_len;
991        v++;
992        argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
993        argp->pagelist++;
994        if (argp->pagelen >= PAGE_SIZE) {
995            argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
996            argp->pagelen -= PAGE_SIZE;
997        } else {
998            argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
999            argp->pagelen -= len;
1000        }
1001    }
1002    argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1003    argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1004    argp->rqstp->rq_vec[v].iov_len = len;
1005    write->wr_vlen = v+1;
1006
1007    DECODE_TAIL;
1008}
1009
1010static __be32
1011nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1012{
1013    DECODE_HEAD;
1014
1015    READ_BUF(12);
1016    COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1017    READ32(rlockowner->rl_owner.len);
1018    READ_BUF(rlockowner->rl_owner.len);
1019    READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1020
1021    if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1022        return nfserr_inval;
1023    DECODE_TAIL;
1024}
1025
1026static __be32
1027nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1028             struct nfsd4_exchange_id *exid)
1029{
1030    int dummy, tmp;
1031    DECODE_HEAD;
1032
1033    READ_BUF(NFS4_VERIFIER_SIZE);
1034    COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1035
1036    READ_BUF(4);
1037    READ32(exid->clname.len);
1038
1039    READ_BUF(exid->clname.len);
1040    SAVEMEM(exid->clname.data, exid->clname.len);
1041
1042    READ_BUF(4);
1043    READ32(exid->flags);
1044
1045    /* Ignore state_protect4_a */
1046    READ_BUF(4);
1047    READ32(exid->spa_how);
1048    switch (exid->spa_how) {
1049    case SP4_NONE:
1050        break;
1051    case SP4_MACH_CRED:
1052        /* spo_must_enforce */
1053        READ_BUF(4);
1054        READ32(dummy);
1055        READ_BUF(dummy * 4);
1056        p += dummy;
1057
1058        /* spo_must_allow */
1059        READ_BUF(4);
1060        READ32(dummy);
1061        READ_BUF(dummy * 4);
1062        p += dummy;
1063        break;
1064    case SP4_SSV:
1065        /* ssp_ops */
1066        READ_BUF(4);
1067        READ32(dummy);
1068        READ_BUF(dummy * 4);
1069        p += dummy;
1070
1071        READ_BUF(4);
1072        READ32(dummy);
1073        READ_BUF(dummy * 4);
1074        p += dummy;
1075
1076        /* ssp_hash_algs<> */
1077        READ_BUF(4);
1078        READ32(tmp);
1079        while (tmp--) {
1080            READ_BUF(4);
1081            READ32(dummy);
1082            READ_BUF(dummy);
1083            p += XDR_QUADLEN(dummy);
1084        }
1085
1086        /* ssp_encr_algs<> */
1087        READ_BUF(4);
1088        READ32(tmp);
1089        while (tmp--) {
1090            READ_BUF(4);
1091            READ32(dummy);
1092            READ_BUF(dummy);
1093            p += XDR_QUADLEN(dummy);
1094        }
1095
1096        /* ssp_window and ssp_num_gss_handles */
1097        READ_BUF(8);
1098        READ32(dummy);
1099        READ32(dummy);
1100        break;
1101    default:
1102        goto xdr_error;
1103    }
1104
1105    /* Ignore Implementation ID */
1106    READ_BUF(4); /* nfs_impl_id4 array length */
1107    READ32(dummy);
1108
1109    if (dummy > 1)
1110        goto xdr_error;
1111
1112    if (dummy == 1) {
1113        /* nii_domain */
1114        READ_BUF(4);
1115        READ32(dummy);
1116        READ_BUF(dummy);
1117        p += XDR_QUADLEN(dummy);
1118
1119        /* nii_name */
1120        READ_BUF(4);
1121        READ32(dummy);
1122        READ_BUF(dummy);
1123        p += XDR_QUADLEN(dummy);
1124
1125        /* nii_date */
1126        READ_BUF(12);
1127        p += 3;
1128    }
1129    DECODE_TAIL;
1130}
1131
1132static __be32
1133nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1134                struct nfsd4_create_session *sess)
1135{
1136    DECODE_HEAD;
1137
1138    u32 dummy;
1139    char *machine_name;
1140    int i;
1141    int nr_secflavs;
1142
1143    READ_BUF(16);
1144    COPYMEM(&sess->clientid, 8);
1145    READ32(sess->seqid);
1146    READ32(sess->flags);
1147
1148    /* Fore channel attrs */
1149    READ_BUF(28);
1150    READ32(dummy); /* headerpadsz is always 0 */
1151    READ32(sess->fore_channel.maxreq_sz);
1152    READ32(sess->fore_channel.maxresp_sz);
1153    READ32(sess->fore_channel.maxresp_cached);
1154    READ32(sess->fore_channel.maxops);
1155    READ32(sess->fore_channel.maxreqs);
1156    READ32(sess->fore_channel.nr_rdma_attrs);
1157    if (sess->fore_channel.nr_rdma_attrs == 1) {
1158        READ_BUF(4);
1159        READ32(sess->fore_channel.rdma_attrs);
1160    } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1161        dprintk("Too many fore channel attr bitmaps!\n");
1162        goto xdr_error;
1163    }
1164
1165    /* Back channel attrs */
1166    READ_BUF(28);
1167    READ32(dummy); /* headerpadsz is always 0 */
1168    READ32(sess->back_channel.maxreq_sz);
1169    READ32(sess->back_channel.maxresp_sz);
1170    READ32(sess->back_channel.maxresp_cached);
1171    READ32(sess->back_channel.maxops);
1172    READ32(sess->back_channel.maxreqs);
1173    READ32(sess->back_channel.nr_rdma_attrs);
1174    if (sess->back_channel.nr_rdma_attrs == 1) {
1175        READ_BUF(4);
1176        READ32(sess->back_channel.rdma_attrs);
1177    } else if (sess->back_channel.nr_rdma_attrs > 1) {
1178        dprintk("Too many back channel attr bitmaps!\n");
1179        goto xdr_error;
1180    }
1181
1182    READ_BUF(8);
1183    READ32(sess->callback_prog);
1184
1185    /* callback_sec_params4 */
1186    READ32(nr_secflavs);
1187    for (i = 0; i < nr_secflavs; ++i) {
1188        READ_BUF(4);
1189        READ32(dummy);
1190        switch (dummy) {
1191        case RPC_AUTH_NULL:
1192            /* Nothing to read */
1193            break;
1194        case RPC_AUTH_UNIX:
1195            READ_BUF(8);
1196            /* stamp */
1197            READ32(dummy);
1198
1199            /* machine name */
1200            READ32(dummy);
1201            READ_BUF(dummy);
1202            SAVEMEM(machine_name, dummy);
1203
1204            /* uid, gid */
1205            READ_BUF(8);
1206            READ32(sess->uid);
1207            READ32(sess->gid);
1208
1209            /* more gids */
1210            READ_BUF(4);
1211            READ32(dummy);
1212            READ_BUF(dummy * 4);
1213            break;
1214        case RPC_AUTH_GSS:
1215            dprintk("RPC_AUTH_GSS callback secflavor "
1216                "not supported!\n");
1217            READ_BUF(8);
1218            /* gcbp_service */
1219            READ32(dummy);
1220            /* gcbp_handle_from_server */
1221            READ32(dummy);
1222            READ_BUF(dummy);
1223            p += XDR_QUADLEN(dummy);
1224            /* gcbp_handle_from_client */
1225            READ_BUF(4);
1226            READ32(dummy);
1227            READ_BUF(dummy);
1228            break;
1229        default:
1230            dprintk("Illegal callback secflavor\n");
1231            return nfserr_inval;
1232        }
1233    }
1234    DECODE_TAIL;
1235}
1236
1237static __be32
1238nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1239                 struct nfsd4_destroy_session *destroy_session)
1240{
1241    DECODE_HEAD;
1242    READ_BUF(NFS4_MAX_SESSIONID_LEN);
1243    COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1244
1245    DECODE_TAIL;
1246}
1247
1248static __be32
1249nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1250              struct nfsd4_sequence *seq)
1251{
1252    DECODE_HEAD;
1253
1254    READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1255    COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1256    READ32(seq->seqid);
1257    READ32(seq->slotid);
1258    READ32(seq->maxslots);
1259    READ32(seq->cachethis);
1260
1261    DECODE_TAIL;
1262}
1263
1264static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1265{
1266    DECODE_HEAD;
1267
1268    READ_BUF(4);
1269    READ32(rc->rca_one_fs);
1270
1271    DECODE_TAIL;
1272}
1273
1274static __be32
1275nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1276{
1277    return nfs_ok;
1278}
1279
1280static __be32
1281nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1282{
1283    return nfserr_notsupp;
1284}
1285
1286typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1287
1288static nfsd4_dec nfsd4_dec_ops[] = {
1289    [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1290    [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1291    [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1292    [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1293    [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1294    [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1295    [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1296    [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1297    [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1298    [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1299    [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1300    [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1301    [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1302    [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1303    [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1304    [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1305    [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1306    [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1307    [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1308    [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1309    [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_noop,
1310    [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1311    [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1312    [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1313    [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1314    [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1315    [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1316    [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1317    [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1318    [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1319    [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1320    [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1321    [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1322    [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1323    [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1324    [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1325    [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1326};
1327
1328static nfsd4_dec nfsd41_dec_ops[] = {
1329    [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1330    [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1331    [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1332    [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1333    [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1334    [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1335    [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1336    [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1337    [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1338    [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1339    [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1340    [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1341    [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1342    [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1343    [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1344    [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1345    [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1346    [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_notsupp,
1347    [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1348    [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1349    [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1350    [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1351    [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1352    [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1353    [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1354    [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1355    [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1356    [OP_RENEW] = (nfsd4_dec)nfsd4_decode_notsupp,
1357    [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1358    [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1359    [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1360    [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1361    [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1362    [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1363    [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1364    [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1365    [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp,
1366
1367    /* new operations for NFSv4.1 */
1368    [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp,
1369    [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1370    [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1371    [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1372    [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1373    [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_notsupp,
1374    [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1375    [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1376    [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1377    [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1378    [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1379    [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1380    [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1381    [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1382    [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1383    [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_notsupp,
1384    [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1385    [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1386    [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1387};
1388
1389struct nfsd4_minorversion_ops {
1390    nfsd4_dec *decoders;
1391    int nops;
1392};
1393
1394static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1395    [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1396    [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1397};
1398
1399static __be32
1400nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1401{
1402    DECODE_HEAD;
1403    struct nfsd4_op *op;
1404    struct nfsd4_minorversion_ops *ops;
1405    int i;
1406
1407    /*
1408     * XXX: According to spec, we should check the tag
1409     * for UTF-8 compliance. I'm postponing this for
1410     * now because it seems that some clients do use
1411     * binary tags.
1412     */
1413    READ_BUF(4);
1414    READ32(argp->taglen);
1415    READ_BUF(argp->taglen + 8);
1416    SAVEMEM(argp->tag, argp->taglen);
1417    READ32(argp->minorversion);
1418    READ32(argp->opcnt);
1419
1420    if (argp->taglen > NFSD4_MAX_TAGLEN)
1421        goto xdr_error;
1422    if (argp->opcnt > 100)
1423        goto xdr_error;
1424
1425    if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1426        argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1427        if (!argp->ops) {
1428            argp->ops = argp->iops;
1429            dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1430            goto xdr_error;
1431        }
1432    }
1433
1434    if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1435        argp->opcnt = 0;
1436
1437    ops = &nfsd4_minorversion[argp->minorversion];
1438    for (i = 0; i < argp->opcnt; i++) {
1439        op = &argp->ops[i];
1440        op->replay = NULL;
1441
1442        /*
1443         * We can't use READ_BUF() here because we need to handle
1444         * a missing opcode as an OP_WRITE + 1. So we need to check
1445         * to see if we're truly at the end of our buffer or if there
1446         * is another page we need to flip to.
1447         */
1448
1449        if (argp->p == argp->end) {
1450            if (argp->pagelen < 4) {
1451                /* There isn't an opcode still on the wire */
1452                op->opnum = OP_WRITE + 1;
1453                op->status = nfserr_bad_xdr;
1454                argp->opcnt = i+1;
1455                break;
1456            }
1457
1458            /*
1459             * False alarm. We just hit a page boundary, but there
1460             * is still data available. Move pointer across page
1461             * boundary. *snip from READ_BUF*
1462             */
1463            argp->p = page_address(argp->pagelist[0]);
1464            argp->pagelist++;
1465            if (argp->pagelen < PAGE_SIZE) {
1466                argp->end = argp->p + (argp->pagelen>>2);
1467                argp->pagelen = 0;
1468            } else {
1469                argp->end = argp->p + (PAGE_SIZE>>2);
1470                argp->pagelen -= PAGE_SIZE;
1471            }
1472        }
1473        op->opnum = ntohl(*argp->p++);
1474
1475        if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1476            op->status = ops->decoders[op->opnum](argp, &op->u);
1477        else {
1478            op->opnum = OP_ILLEGAL;
1479            op->status = nfserr_op_illegal;
1480        }
1481
1482        if (op->status) {
1483            argp->opcnt = i+1;
1484            break;
1485        }
1486    }
1487
1488    DECODE_TAIL;
1489}
1490
1491#define WRITE32(n) *p++ = htonl(n)
1492#define WRITE64(n) do { \
1493    *p++ = htonl((u32)((n) >> 32)); \
1494    *p++ = htonl((u32)(n)); \
1495} while (0)
1496#define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1497    *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1498    memcpy(p, ptr, nbytes); \
1499    p += XDR_QUADLEN(nbytes); \
1500}} while (0)
1501
1502static void write32(__be32 **p, u32 n)
1503{
1504    *(*p)++ = n;
1505}
1506
1507static void write64(__be32 **p, u64 n)
1508{
1509    write32(p, (u32)(n >> 32));
1510    write32(p, (u32)n);
1511}
1512
1513static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1514{
1515    if (IS_I_VERSION(inode)) {
1516        write64(p, inode->i_version);
1517    } else {
1518        write32(p, stat->ctime.tv_sec);
1519        write32(p, stat->ctime.tv_nsec);
1520    }
1521}
1522
1523static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1524{
1525    write32(p, c->atomic);
1526    if (c->change_supported) {
1527        write64(p, c->before_change);
1528        write64(p, c->after_change);
1529    } else {
1530        write32(p, c->before_ctime_sec);
1531        write32(p, c->before_ctime_nsec);
1532        write32(p, c->after_ctime_sec);
1533        write32(p, c->after_ctime_nsec);
1534    }
1535}
1536
1537#define RESERVE_SPACE(nbytes) do { \
1538    p = resp->p; \
1539    BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1540} while (0)
1541#define ADJUST_ARGS() resp->p = p
1542
1543/*
1544 * Header routine to setup seqid operation replay cache
1545 */
1546#define ENCODE_SEQID_OP_HEAD \
1547    __be32 *save; \
1548                                \
1549    save = resp->p;
1550
1551/*
1552 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1553 * is where sequence id's are incremented, and the replay cache is filled.
1554 * Note that we increment sequence id's here, at the last moment, so we're sure
1555 * we know whether the error to be returned is a sequence id mutating error.
1556 */
1557
1558#define ENCODE_SEQID_OP_TAIL(stateowner) do { \
1559    if (seqid_mutating_err(nfserr) && stateowner) { \
1560        stateowner->so_seqid++; \
1561        stateowner->so_replay.rp_status = nfserr; \
1562        stateowner->so_replay.rp_buflen = \
1563              (((char *)(resp)->p - (char *)save)); \
1564        memcpy(stateowner->so_replay.rp_buf, save, \
1565             stateowner->so_replay.rp_buflen); \
1566    } } while (0);
1567
1568/* Encode as an array of strings the string given with components
1569 * separated @sep.
1570 */
1571static __be32 nfsd4_encode_components(char sep, char *components,
1572                   __be32 **pp, int *buflen)
1573{
1574    __be32 *p = *pp;
1575    __be32 *countp = p;
1576    int strlen, count=0;
1577    char *str, *end;
1578
1579    dprintk("nfsd4_encode_components(%s)\n", components);
1580    if ((*buflen -= 4) < 0)
1581        return nfserr_resource;
1582    WRITE32(0); /* We will fill this in with @count later */
1583    end = str = components;
1584    while (*end) {
1585        for (; *end && (*end != sep); end++)
1586            ; /* Point to end of component */
1587        strlen = end - str;
1588        if (strlen) {
1589            if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1590                return nfserr_resource;
1591            WRITE32(strlen);
1592            WRITEMEM(str, strlen);
1593            count++;
1594        }
1595        else
1596            end++;
1597        str = end;
1598    }
1599    *pp = p;
1600    p = countp;
1601    WRITE32(count);
1602    return 0;
1603}
1604
1605/*
1606 * encode a location element of a fs_locations structure
1607 */
1608static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1609                    __be32 **pp, int *buflen)
1610{
1611    __be32 status;
1612    __be32 *p = *pp;
1613
1614    status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1615    if (status)
1616        return status;
1617    status = nfsd4_encode_components('/', location->path, &p, buflen);
1618    if (status)
1619        return status;
1620    *pp = p;
1621    return 0;
1622}
1623
1624/*
1625 * Return the path to an export point in the pseudo filesystem namespace
1626 * Returned string is safe to use as long as the caller holds a reference
1627 * to @exp.
1628 */
1629static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1630{
1631    struct svc_fh tmp_fh;
1632    char *path = NULL, *rootpath;
1633    size_t rootlen;
1634
1635    fh_init(&tmp_fh, NFS4_FHSIZE);
1636    *stat = exp_pseudoroot(rqstp, &tmp_fh);
1637    if (*stat)
1638        return NULL;
1639    rootpath = tmp_fh.fh_export->ex_pathname;
1640
1641    path = exp->ex_pathname;
1642
1643    rootlen = strlen(rootpath);
1644    if (strncmp(path, rootpath, rootlen)) {
1645        dprintk("nfsd: fs_locations failed;"
1646            "%s is not contained in %s\n", path, rootpath);
1647        *stat = nfserr_notsupp;
1648        path = NULL;
1649        goto out;
1650    }
1651    path += rootlen;
1652out:
1653    fh_put(&tmp_fh);
1654    return path;
1655}
1656
1657/*
1658 * encode a fs_locations structure
1659 */
1660static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1661                     struct svc_export *exp,
1662                     __be32 **pp, int *buflen)
1663{
1664    __be32 status;
1665    int i;
1666    __be32 *p = *pp;
1667    struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1668    char *root = nfsd4_path(rqstp, exp, &status);
1669
1670    if (status)
1671        return status;
1672    status = nfsd4_encode_components('/', root, &p, buflen);
1673    if (status)
1674        return status;
1675    if ((*buflen -= 4) < 0)
1676        return nfserr_resource;
1677    WRITE32(fslocs->locations_count);
1678    for (i=0; i<fslocs->locations_count; i++) {
1679        status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1680                           &p, buflen);
1681        if (status)
1682            return status;
1683    }
1684    *pp = p;
1685    return 0;
1686}
1687
1688static u32 nfs4_ftypes[16] = {
1689        NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
1690        NF4DIR, NF4BAD, NF4BLK, NF4BAD,
1691        NF4REG, NF4BAD, NF4LNK, NF4BAD,
1692        NF4SOCK, NF4BAD, NF4LNK, NF4BAD,
1693};
1694
1695static __be32
1696nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1697            __be32 **p, int *buflen)
1698{
1699    int status;
1700
1701    if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1702        return nfserr_resource;
1703    if (whotype != NFS4_ACL_WHO_NAMED)
1704        status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1705    else if (group)
1706        status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1707    else
1708        status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1709    if (status < 0)
1710        return nfserrno(status);
1711    *p = xdr_encode_opaque(*p, NULL, status);
1712    *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1713    BUG_ON(*buflen < 0);
1714    return 0;
1715}
1716
1717static inline __be32
1718nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1719{
1720    return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1721}
1722
1723static inline __be32
1724nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1725{
1726    return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1727}
1728
1729static inline __be32
1730nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1731        __be32 **p, int *buflen)
1732{
1733    return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1734}
1735
1736#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1737                  FATTR4_WORD0_RDATTR_ERROR)
1738#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1739
1740static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1741{
1742    /* As per referral draft: */
1743    if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1744        *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1745        if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1746                *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1747            *rdattr_err = NFSERR_MOVED;
1748        else
1749            return nfserr_moved;
1750    }
1751    *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1752    *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1753    return 0;
1754}
1755
1756/*
1757 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1758 * ourselves.
1759 *
1760 * @countp is the buffer size in _words_; upon successful return this becomes
1761 * replaced with the number of words written.
1762 */
1763__be32
1764nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1765        struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1766        struct svc_rqst *rqstp, int ignore_crossmnt)
1767{
1768    u32 bmval0 = bmval[0];
1769    u32 bmval1 = bmval[1];
1770    u32 bmval2 = bmval[2];
1771    struct kstat stat;
1772    struct svc_fh tempfh;
1773    struct kstatfs statfs;
1774    int buflen = *countp << 2;
1775    __be32 *attrlenp;
1776    u32 dummy;
1777    u64 dummy64;
1778    u32 rdattr_err = 0;
1779    __be32 *p = buffer;
1780    __be32 status;
1781    int err;
1782    int aclsupport = 0;
1783    struct nfs4_acl *acl = NULL;
1784    struct nfsd4_compoundres *resp = rqstp->rq_resp;
1785    u32 minorversion = resp->cstate.minorversion;
1786    struct path path = {
1787        .mnt = exp->ex_path.mnt,
1788        .dentry = dentry,
1789    };
1790
1791    BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1792    BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1793    BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1794    BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1795
1796    if (exp->ex_fslocs.migrated) {
1797        BUG_ON(bmval[2]);
1798        status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1799        if (status)
1800            goto out;
1801    }
1802
1803    err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1804    if (err)
1805        goto out_nfserr;
1806    if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1807            FATTR4_WORD0_MAXNAME)) ||
1808        (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1809               FATTR4_WORD1_SPACE_TOTAL))) {
1810        err = vfs_statfs(&path, &statfs);
1811        if (err)
1812            goto out_nfserr;
1813    }
1814    if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1815        fh_init(&tempfh, NFS4_FHSIZE);
1816        status = fh_compose(&tempfh, exp, dentry, NULL);
1817        if (status)
1818            goto out;
1819        fhp = &tempfh;
1820    }
1821    if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1822            | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1823        err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1824        aclsupport = (err == 0);
1825        if (bmval0 & FATTR4_WORD0_ACL) {
1826            if (err == -EOPNOTSUPP)
1827                bmval0 &= ~FATTR4_WORD0_ACL;
1828            else if (err == -EINVAL) {
1829                status = nfserr_attrnotsupp;
1830                goto out;
1831            } else if (err != 0)
1832                goto out_nfserr;
1833        }
1834    }
1835
1836    if (bmval2) {
1837        if ((buflen -= 16) < 0)
1838            goto out_resource;
1839        WRITE32(3);
1840        WRITE32(bmval0);
1841        WRITE32(bmval1);
1842        WRITE32(bmval2);
1843    } else if (bmval1) {
1844        if ((buflen -= 12) < 0)
1845            goto out_resource;
1846        WRITE32(2);
1847        WRITE32(bmval0);
1848        WRITE32(bmval1);
1849    } else {
1850        if ((buflen -= 8) < 0)
1851            goto out_resource;
1852        WRITE32(1);
1853        WRITE32(bmval0);
1854    }
1855    attrlenp = p++; /* to be backfilled later */
1856
1857    if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1858        u32 word0 = nfsd_suppattrs0(minorversion);
1859        u32 word1 = nfsd_suppattrs1(minorversion);
1860        u32 word2 = nfsd_suppattrs2(minorversion);
1861
1862        if (!aclsupport)
1863            word0 &= ~FATTR4_WORD0_ACL;
1864        if (!word2) {
1865            if ((buflen -= 12) < 0)
1866                goto out_resource;
1867            WRITE32(2);
1868            WRITE32(word0);
1869            WRITE32(word1);
1870        } else {
1871            if ((buflen -= 16) < 0)
1872                goto out_resource;
1873            WRITE32(3);
1874            WRITE32(word0);
1875            WRITE32(word1);
1876            WRITE32(word2);
1877        }
1878    }
1879    if (bmval0 & FATTR4_WORD0_TYPE) {
1880        if ((buflen -= 4) < 0)
1881            goto out_resource;
1882        dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1883        if (dummy == NF4BAD)
1884            goto out_serverfault;
1885        WRITE32(dummy);
1886    }
1887    if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1888        if ((buflen -= 4) < 0)
1889            goto out_resource;
1890        if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1891            WRITE32(NFS4_FH_PERSISTENT);
1892        else
1893            WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1894    }
1895    if (bmval0 & FATTR4_WORD0_CHANGE) {
1896        if ((buflen -= 8) < 0)
1897            goto out_resource;
1898        write_change(&p, &stat, dentry->d_inode);
1899    }
1900    if (bmval0 & FATTR4_WORD0_SIZE) {
1901        if ((buflen -= 8) < 0)
1902            goto out_resource;
1903        WRITE64(stat.size);
1904    }
1905    if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1906        if ((buflen -= 4) < 0)
1907            goto out_resource;
1908        WRITE32(1);
1909    }
1910    if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1911        if ((buflen -= 4) < 0)
1912            goto out_resource;
1913        WRITE32(1);
1914    }
1915    if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1916        if ((buflen -= 4) < 0)
1917            goto out_resource;
1918        WRITE32(0);
1919    }
1920    if (bmval0 & FATTR4_WORD0_FSID) {
1921        if ((buflen -= 16) < 0)
1922            goto out_resource;
1923        if (exp->ex_fslocs.migrated) {
1924            WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1925            WRITE64(NFS4_REFERRAL_FSID_MINOR);
1926        } else switch(fsid_source(fhp)) {
1927        case FSIDSOURCE_FSID:
1928            WRITE64((u64)exp->ex_fsid);
1929            WRITE64((u64)0);
1930            break;
1931        case FSIDSOURCE_DEV:
1932            WRITE32(0);
1933            WRITE32(MAJOR(stat.dev));
1934            WRITE32(0);
1935            WRITE32(MINOR(stat.dev));
1936            break;
1937        case FSIDSOURCE_UUID:
1938            WRITEMEM(exp->ex_uuid, 16);
1939            break;
1940        }
1941    }
1942    if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1943        if ((buflen -= 4) < 0)
1944            goto out_resource;
1945        WRITE32(0);
1946    }
1947    if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1948        if ((buflen -= 4) < 0)
1949            goto out_resource;
1950        WRITE32(nfsd4_lease);
1951    }
1952    if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1953        if ((buflen -= 4) < 0)
1954            goto out_resource;
1955        WRITE32(rdattr_err);
1956    }
1957    if (bmval0 & FATTR4_WORD0_ACL) {
1958        struct nfs4_ace *ace;
1959
1960        if (acl == NULL) {
1961            if ((buflen -= 4) < 0)
1962                goto out_resource;
1963
1964            WRITE32(0);
1965            goto out_acl;
1966        }
1967        if ((buflen -= 4) < 0)
1968            goto out_resource;
1969        WRITE32(acl->naces);
1970
1971        for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1972            if ((buflen -= 4*3) < 0)
1973                goto out_resource;
1974            WRITE32(ace->type);
1975            WRITE32(ace->flag);
1976            WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1977            status = nfsd4_encode_aclname(rqstp, ace->whotype,
1978                ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1979                &p, &buflen);
1980            if (status == nfserr_resource)
1981                goto out_resource;
1982            if (status)
1983                goto out;
1984        }
1985    }
1986out_acl:
1987    if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1988        if ((buflen -= 4) < 0)
1989            goto out_resource;
1990        WRITE32(aclsupport ?
1991            ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1992    }
1993    if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1994        if ((buflen -= 4) < 0)
1995            goto out_resource;
1996        WRITE32(1);
1997    }
1998    if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1999        if ((buflen -= 4) < 0)
2000            goto out_resource;
2001        WRITE32(1);
2002    }
2003    if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2004        if ((buflen -= 4) < 0)
2005            goto out_resource;
2006        WRITE32(1);
2007    }
2008    if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2009        if ((buflen -= 4) < 0)
2010            goto out_resource;
2011        WRITE32(1);
2012    }
2013    if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2014        buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2015        if (buflen < 0)
2016            goto out_resource;
2017        WRITE32(fhp->fh_handle.fh_size);
2018        WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2019    }
2020    if (bmval0 & FATTR4_WORD0_FILEID) {
2021        if ((buflen -= 8) < 0)
2022            goto out_resource;
2023        WRITE64(stat.ino);
2024    }
2025    if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2026        if ((buflen -= 8) < 0)
2027            goto out_resource;
2028        WRITE64((u64) statfs.f_ffree);
2029    }
2030    if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2031        if ((buflen -= 8) < 0)
2032            goto out_resource;
2033        WRITE64((u64) statfs.f_ffree);
2034    }
2035    if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2036        if ((buflen -= 8) < 0)
2037            goto out_resource;
2038        WRITE64((u64) statfs.f_files);
2039    }
2040    if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2041        status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2042        if (status == nfserr_resource)
2043            goto out_resource;
2044        if (status)
2045            goto out;
2046    }
2047    if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2048        if ((buflen -= 4) < 0)
2049            goto out_resource;
2050        WRITE32(1);
2051    }
2052    if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2053        if ((buflen -= 8) < 0)
2054            goto out_resource;
2055        WRITE64(~(u64)0);
2056    }
2057    if (bmval0 & FATTR4_WORD0_MAXLINK) {
2058        if ((buflen -= 4) < 0)
2059            goto out_resource;
2060        WRITE32(255);
2061    }
2062    if (bmval0 & FATTR4_WORD0_MAXNAME) {
2063        if ((buflen -= 4) < 0)
2064            goto out_resource;
2065        WRITE32(statfs.f_namelen);
2066    }
2067    if (bmval0 & FATTR4_WORD0_MAXREAD) {
2068        if ((buflen -= 8) < 0)
2069            goto out_resource;
2070        WRITE64((u64) svc_max_payload(rqstp));
2071    }
2072    if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2073        if ((buflen -= 8) < 0)
2074            goto out_resource;
2075        WRITE64((u64) svc_max_payload(rqstp));
2076    }
2077    if (bmval1 & FATTR4_WORD1_MODE) {
2078        if ((buflen -= 4) < 0)
2079            goto out_resource;
2080        WRITE32(stat.mode & S_IALLUGO);
2081    }
2082    if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2083        if ((buflen -= 4) < 0)
2084            goto out_resource;
2085        WRITE32(1);
2086    }
2087    if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2088        if ((buflen -= 4) < 0)
2089            goto out_resource;
2090        WRITE32(stat.nlink);
2091    }
2092    if (bmval1 & FATTR4_WORD1_OWNER) {
2093        status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2094        if (status == nfserr_resource)
2095            goto out_resource;
2096        if (status)
2097            goto out;
2098    }
2099    if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2100        status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2101        if (status == nfserr_resource)
2102            goto out_resource;
2103        if (status)
2104            goto out;
2105    }
2106    if (bmval1 & FATTR4_WORD1_RAWDEV) {
2107        if ((buflen -= 8) < 0)
2108            goto out_resource;
2109        WRITE32((u32) MAJOR(stat.rdev));
2110        WRITE32((u32) MINOR(stat.rdev));
2111    }
2112    if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2113        if ((buflen -= 8) < 0)
2114            goto out_resource;
2115        dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2116        WRITE64(dummy64);
2117    }
2118    if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2119        if ((buflen -= 8) < 0)
2120            goto out_resource;
2121        dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2122        WRITE64(dummy64);
2123    }
2124    if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2125        if ((buflen -= 8) < 0)
2126            goto out_resource;
2127        dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2128        WRITE64(dummy64);
2129    }
2130    if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2131        if ((buflen -= 8) < 0)
2132            goto out_resource;
2133        dummy64 = (u64)stat.blocks << 9;
2134        WRITE64(dummy64);
2135    }
2136    if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2137        if ((buflen -= 12) < 0)
2138            goto out_resource;
2139        WRITE32(0);
2140        WRITE32(stat.atime.tv_sec);
2141        WRITE32(stat.atime.tv_nsec);
2142    }
2143    if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2144        if ((buflen -= 12) < 0)
2145            goto out_resource;
2146        WRITE32(0);
2147        WRITE32(1);
2148        WRITE32(0);
2149    }
2150    if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2151        if ((buflen -= 12) < 0)
2152            goto out_resource;
2153        WRITE32(0);
2154        WRITE32(stat.ctime.tv_sec);
2155        WRITE32(stat.ctime.tv_nsec);
2156    }
2157    if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2158        if ((buflen -= 12) < 0)
2159            goto out_resource;
2160        WRITE32(0);
2161        WRITE32(stat.mtime.tv_sec);
2162        WRITE32(stat.mtime.tv_nsec);
2163    }
2164    if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2165        if ((buflen -= 8) < 0)
2166                    goto out_resource;
2167        /*
2168         * Get parent's attributes if not ignoring crossmount
2169         * and this is the root of a cross-mounted filesystem.
2170         */
2171        if (ignore_crossmnt == 0 &&
2172            dentry == exp->ex_path.mnt->mnt_root) {
2173            struct path path = exp->ex_path;
2174            path_get(&path);
2175            while (follow_up(&path)) {
2176                if (path.dentry != path.mnt->mnt_root)
2177                    break;
2178            }
2179            err = vfs_getattr(path.mnt, path.dentry, &stat);
2180            path_put(&path);
2181            if (err)
2182                goto out_nfserr;
2183        }
2184        WRITE64(stat.ino);
2185    }
2186    if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2187        WRITE32(3);
2188        WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2189        WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2190        WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2191    }
2192
2193    *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2194    *countp = p - buffer;
2195    status = nfs_ok;
2196
2197out:
2198    kfree(acl);
2199    if (fhp == &tempfh)
2200        fh_put(&tempfh);
2201    return status;
2202out_nfserr:
2203    status = nfserrno(err);
2204    goto out;
2205out_resource:
2206    *countp = 0;
2207    status = nfserr_resource;
2208    goto out;
2209out_serverfault:
2210    status = nfserr_serverfault;
2211    goto out;
2212}
2213
2214static inline int attributes_need_mount(u32 *bmval)
2215{
2216    if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2217        return 1;
2218    if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2219        return 1;
2220    return 0;
2221}
2222
2223static __be32
2224nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2225        const char *name, int namlen, __be32 *p, int *buflen)
2226{
2227    struct svc_export *exp = cd->rd_fhp->fh_export;
2228    struct dentry *dentry;
2229    __be32 nfserr;
2230    int ignore_crossmnt = 0;
2231
2232    dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2233    if (IS_ERR(dentry))
2234        return nfserrno(PTR_ERR(dentry));
2235    if (!dentry->d_inode) {
2236        /*
2237         * nfsd_buffered_readdir drops the i_mutex between
2238         * readdir and calling this callback, leaving a window
2239         * where this directory entry could have gone away.
2240         */
2241        dput(dentry);
2242        return nfserr_noent;
2243    }
2244
2245    exp_get(exp);
2246    /*
2247     * In the case of a mountpoint, the client may be asking for
2248     * attributes that are only properties of the underlying filesystem
2249     * as opposed to the cross-mounted file system. In such a case,
2250     * we will not follow the cross mount and will fill the attribtutes
2251     * directly from the mountpoint dentry.
2252     */
2253    if (nfsd_mountpoint(dentry, exp)) {
2254        int err;
2255
2256        if (!(exp->ex_flags & NFSEXP_V4ROOT)
2257                && !attributes_need_mount(cd->rd_bmval)) {
2258            ignore_crossmnt = 1;
2259            goto out_encode;
2260        }
2261        /*
2262         * Why the heck aren't we just using nfsd_lookup??
2263         * Different "."/".." handling? Something else?
2264         * At least, add a comment here to explain....
2265         */
2266        err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2267        if (err) {
2268            nfserr = nfserrno(err);
2269            goto out_put;
2270        }
2271        nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2272        if (nfserr)
2273            goto out_put;
2274
2275    }
2276out_encode:
2277    nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2278                    cd->rd_rqstp, ignore_crossmnt);
2279out_put:
2280    dput(dentry);
2281    exp_put(exp);
2282    return nfserr;
2283}
2284
2285static __be32 *
2286nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2287{
2288    __be32 *attrlenp;
2289
2290    if (buflen < 6)
2291        return NULL;
2292    *p++ = htonl(2);
2293    *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2294    *p++ = htonl(0); /* bmval1 */
2295
2296    attrlenp = p++;
2297    *p++ = nfserr; /* no htonl */
2298    *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2299    return p;
2300}
2301
2302static int
2303nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2304            loff_t offset, u64 ino, unsigned int d_type)
2305{
2306    struct readdir_cd *ccd = ccdv;
2307    struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2308    int buflen;
2309    __be32 *p = cd->buffer;
2310    __be32 *cookiep;
2311    __be32 nfserr = nfserr_toosmall;
2312
2313    /* In nfsv4, "." and ".." never make it onto the wire.. */
2314    if (name && isdotent(name, namlen)) {
2315        cd->common.err = nfs_ok;
2316        return 0;
2317    }
2318
2319    if (cd->offset)
2320        xdr_encode_hyper(cd->offset, (u64) offset);
2321
2322    buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2323    if (buflen < 0)
2324        goto fail;
2325
2326    *p++ = xdr_one; /* mark entry present */
2327    cookiep = p;
2328    p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2329    p = xdr_encode_array(p, name, namlen); /* name length & name */
2330
2331    nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2332    switch (nfserr) {
2333    case nfs_ok:
2334        p += buflen;
2335        break;
2336    case nfserr_resource:
2337        nfserr = nfserr_toosmall;
2338        goto fail;
2339    case nfserr_noent:
2340        goto skip_entry;
2341    default:
2342        /*
2343         * If the client requested the RDATTR_ERROR attribute,
2344         * we stuff the error code into this attribute
2345         * and continue. If this attribute was not requested,
2346         * then in accordance with the spec, we fail the
2347         * entire READDIR operation(!)
2348         */
2349        if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2350            goto fail;
2351        p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2352        if (p == NULL) {
2353            nfserr = nfserr_toosmall;
2354            goto fail;
2355        }
2356    }
2357    cd->buflen -= (p - cd->buffer);
2358    cd->buffer = p;
2359    cd->offset = cookiep;
2360skip_entry:
2361    cd->common.err = nfs_ok;
2362    return 0;
2363fail:
2364    cd->common.err = nfserr;
2365    return -EINVAL;
2366}
2367
2368static void
2369nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2370{
2371    __be32 *p;
2372
2373    RESERVE_SPACE(sizeof(stateid_t));
2374    WRITE32(sid->si_generation);
2375    WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2376    ADJUST_ARGS();
2377}
2378
2379static __be32
2380nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2381{
2382    __be32 *p;
2383
2384    if (!nfserr) {
2385        RESERVE_SPACE(8);
2386        WRITE32(access->ac_supported);
2387        WRITE32(access->ac_resp_access);
2388        ADJUST_ARGS();
2389    }
2390    return nfserr;
2391}
2392
2393static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2394{
2395    __be32 *p;
2396
2397    if (!nfserr) {
2398        RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2399        WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2400        WRITE32(bcts->dir);
2401        /* XXX: ? */
2402        WRITE32(0);
2403        ADJUST_ARGS();
2404    }
2405    return nfserr;
2406}
2407
2408static __be32
2409nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2410{
2411    ENCODE_SEQID_OP_HEAD;
2412
2413    if (!nfserr)
2414        nfsd4_encode_stateid(resp, &close->cl_stateid);
2415
2416    ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2417    return nfserr;
2418}
2419
2420
2421static __be32
2422nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2423{
2424    __be32 *p;
2425
2426    if (!nfserr) {
2427        RESERVE_SPACE(8);
2428        WRITEMEM(commit->co_verf.data, 8);
2429        ADJUST_ARGS();
2430    }
2431    return nfserr;
2432}
2433
2434static __be32
2435nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2436{
2437    __be32 *p;
2438
2439    if (!nfserr) {
2440        RESERVE_SPACE(32);
2441        write_cinfo(&p, &create->cr_cinfo);
2442        WRITE32(2);
2443        WRITE32(create->cr_bmval[0]);
2444        WRITE32(create->cr_bmval[1]);
2445        ADJUST_ARGS();
2446    }
2447    return nfserr;
2448}
2449
2450static __be32
2451nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2452{
2453    struct svc_fh *fhp = getattr->ga_fhp;
2454    int buflen;
2455
2456    if (nfserr)
2457        return nfserr;
2458
2459    buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2460    nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2461                    resp->p, &buflen, getattr->ga_bmval,
2462                    resp->rqstp, 0);
2463    if (!nfserr)
2464        resp->p += buflen;
2465    return nfserr;
2466}
2467
2468static __be32
2469nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2470{
2471    struct svc_fh *fhp = *fhpp;
2472    unsigned int len;
2473    __be32 *p;
2474
2475    if (!nfserr) {
2476        len = fhp->fh_handle.fh_size;
2477        RESERVE_SPACE(len + 4);
2478        WRITE32(len);
2479        WRITEMEM(&fhp->fh_handle.fh_base, len);
2480        ADJUST_ARGS();
2481    }
2482    return nfserr;
2483}
2484
2485/*
2486* Including all fields other than the name, a LOCK4denied structure requires
2487* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2488*/
2489static void
2490nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2491{
2492    __be32 *p;
2493
2494    RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2495    WRITE64(ld->ld_start);
2496    WRITE64(ld->ld_length);
2497    WRITE32(ld->ld_type);
2498    if (ld->ld_sop) {
2499        WRITEMEM(&ld->ld_clientid, 8);
2500        WRITE32(ld->ld_sop->so_owner.len);
2501        WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2502        kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2503    } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2504        WRITE64((u64)0); /* clientid */
2505        WRITE32(0); /* length of owner name */
2506    }
2507    ADJUST_ARGS();
2508}
2509
2510static __be32
2511nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2512{
2513    ENCODE_SEQID_OP_HEAD;
2514
2515    if (!nfserr)
2516        nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2517    else if (nfserr == nfserr_denied)
2518        nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2519
2520    ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2521    return nfserr;
2522}
2523
2524static __be32
2525nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2526{
2527    if (nfserr == nfserr_denied)
2528        nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2529    return nfserr;
2530}
2531
2532static __be32
2533nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2534{
2535    ENCODE_SEQID_OP_HEAD;
2536
2537    if (!nfserr)
2538        nfsd4_encode_stateid(resp, &locku->lu_stateid);
2539
2540    ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2541    return nfserr;
2542}
2543
2544
2545static __be32
2546nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2547{
2548    __be32 *p;
2549
2550    if (!nfserr) {
2551        RESERVE_SPACE(20);
2552        write_cinfo(&p, &link->li_cinfo);
2553        ADJUST_ARGS();
2554    }
2555    return nfserr;
2556}
2557
2558
2559static __be32
2560nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2561{
2562    __be32 *p;
2563    ENCODE_SEQID_OP_HEAD;
2564
2565    if (nfserr)
2566        goto out;
2567
2568    nfsd4_encode_stateid(resp, &open->op_stateid);
2569    RESERVE_SPACE(40);
2570    write_cinfo(&p, &open->op_cinfo);
2571    WRITE32(open->op_rflags);
2572    WRITE32(2);
2573    WRITE32(open->op_bmval[0]);
2574    WRITE32(open->op_bmval[1]);
2575    WRITE32(open->op_delegate_type);
2576    ADJUST_ARGS();
2577
2578    switch (open->op_delegate_type) {
2579    case NFS4_OPEN_DELEGATE_NONE:
2580        break;
2581    case NFS4_OPEN_DELEGATE_READ:
2582        nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2583        RESERVE_SPACE(20);
2584        WRITE32(open->op_recall);
2585
2586        /*
2587         * TODO: ACE's in delegations
2588         */
2589        WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2590        WRITE32(0);
2591        WRITE32(0);
2592        WRITE32(0); /* XXX: is NULL principal ok? */
2593        ADJUST_ARGS();
2594        break;
2595    case NFS4_OPEN_DELEGATE_WRITE:
2596        nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2597        RESERVE_SPACE(32);
2598        WRITE32(0);
2599
2600        /*
2601         * TODO: space_limit's in delegations
2602         */
2603        WRITE32(NFS4_LIMIT_SIZE);
2604        WRITE32(~(u32)0);
2605        WRITE32(~(u32)0);
2606
2607        /*
2608         * TODO: ACE's in delegations
2609         */
2610        WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2611        WRITE32(0);
2612        WRITE32(0);
2613        WRITE32(0); /* XXX: is NULL principal ok? */
2614        ADJUST_ARGS();
2615        break;
2616    default:
2617        BUG();
2618    }
2619    /* XXX save filehandle here */
2620out:
2621    ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2622    return nfserr;
2623}
2624
2625static __be32
2626nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2627{
2628    ENCODE_SEQID_OP_HEAD;
2629
2630    if (!nfserr)
2631        nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2632
2633    ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2634    return nfserr;
2635}
2636
2637static __be32
2638nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2639{
2640    ENCODE_SEQID_OP_HEAD;
2641
2642    if (!nfserr)
2643        nfsd4_encode_stateid(resp, &od->od_stateid);
2644
2645    ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2646    return nfserr;
2647}
2648
2649static __be32
2650nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2651          struct nfsd4_read *read)
2652{
2653    u32 eof;
2654    int v, pn;
2655    unsigned long maxcount;
2656    long len;
2657    __be32 *p;
2658
2659    if (nfserr)
2660        return nfserr;
2661    if (resp->xbuf->page_len)
2662        return nfserr_resource;
2663
2664    RESERVE_SPACE(8); /* eof flag and byte count */
2665
2666    maxcount = svc_max_payload(resp->rqstp);
2667    if (maxcount > read->rd_length)
2668        maxcount = read->rd_length;
2669
2670    len = maxcount;
2671    v = 0;
2672    while (len > 0) {
2673        pn = resp->rqstp->rq_resused++;
2674        resp->rqstp->rq_vec[v].iov_base =
2675            page_address(resp->rqstp->rq_respages[pn]);
2676        resp->rqstp->rq_vec[v].iov_len =
2677            len < PAGE_SIZE ? len : PAGE_SIZE;
2678        v++;
2679        len -= PAGE_SIZE;
2680    }
2681    read->rd_vlen = v;
2682
2683    nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2684            read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2685            &maxcount);
2686
2687    if (nfserr == nfserr_symlink)
2688        nfserr = nfserr_inval;
2689    if (nfserr)
2690        return nfserr;
2691    eof = (read->rd_offset + maxcount >=
2692           read->rd_fhp->fh_dentry->d_inode->i_size);
2693
2694    WRITE32(eof);
2695    WRITE32(maxcount);
2696    ADJUST_ARGS();
2697    resp->xbuf->head[0].iov_len = (char*)p
2698                    - (char*)resp->xbuf->head[0].iov_base;
2699    resp->xbuf->page_len = maxcount;
2700
2701    /* Use rest of head for padding and remaining ops: */
2702    resp->xbuf->tail[0].iov_base = p;
2703    resp->xbuf->tail[0].iov_len = 0;
2704    if (maxcount&3) {
2705        RESERVE_SPACE(4);
2706        WRITE32(0);
2707        resp->xbuf->tail[0].iov_base += maxcount&3;
2708        resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2709        ADJUST_ARGS();
2710    }
2711    return 0;
2712}
2713
2714static __be32
2715nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2716{
2717    int maxcount;
2718    char *page;
2719    __be32 *p;
2720
2721    if (nfserr)
2722        return nfserr;
2723    if (resp->xbuf->page_len)
2724        return nfserr_resource;
2725
2726    page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2727
2728    maxcount = PAGE_SIZE;
2729    RESERVE_SPACE(4);
2730
2731    /*
2732     * XXX: By default, the ->readlink() VFS op will truncate symlinks
2733     * if they would overflow the buffer. Is this kosher in NFSv4? If
2734     * not, one easy fix is: if ->readlink() precisely fills the buffer,
2735     * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2736     */
2737    nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2738    if (nfserr == nfserr_isdir)
2739        return nfserr_inval;
2740    if (nfserr)
2741        return nfserr;
2742
2743    WRITE32(maxcount);
2744    ADJUST_ARGS();
2745    resp->xbuf->head[0].iov_len = (char*)p
2746                - (char*)resp->xbuf->head[0].iov_base;
2747    resp->xbuf->page_len = maxcount;
2748
2749    /* Use rest of head for padding and remaining ops: */
2750    resp->xbuf->tail[0].iov_base = p;
2751    resp->xbuf->tail[0].iov_len = 0;
2752    if (maxcount&3) {
2753        RESERVE_SPACE(4);
2754        WRITE32(0);
2755        resp->xbuf->tail[0].iov_base += maxcount&3;
2756        resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2757        ADJUST_ARGS();
2758    }
2759    return 0;
2760}
2761
2762static __be32
2763nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2764{
2765    int maxcount;
2766    loff_t offset;
2767    __be32 *page, *savep, *tailbase;
2768    __be32 *p;
2769
2770    if (nfserr)
2771        return nfserr;
2772    if (resp->xbuf->page_len)
2773        return nfserr_resource;
2774
2775    RESERVE_SPACE(8); /* verifier */
2776    savep = p;
2777
2778    /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2779    WRITE32(0);
2780    WRITE32(0);
2781    ADJUST_ARGS();
2782    resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2783    tailbase = p;
2784
2785    maxcount = PAGE_SIZE;
2786    if (maxcount > readdir->rd_maxcount)
2787        maxcount = readdir->rd_maxcount;
2788
2789    /*
2790     * Convert from bytes to words, account for the two words already
2791     * written, make sure to leave two words at the end for the next
2792     * pointer and eof field.
2793     */
2794    maxcount = (maxcount >> 2) - 4;
2795    if (maxcount < 0) {
2796        nfserr = nfserr_toosmall;
2797        goto err_no_verf;
2798    }
2799
2800    page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2801    readdir->common.err = 0;
2802    readdir->buflen = maxcount;
2803    readdir->buffer = page;
2804    readdir->offset = NULL;
2805
2806    offset = readdir->rd_cookie;
2807    nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2808                  &offset,
2809                  &readdir->common, nfsd4_encode_dirent);
2810    if (nfserr == nfs_ok &&
2811        readdir->common.err == nfserr_toosmall &&
2812        readdir->buffer == page)
2813        nfserr = nfserr_toosmall;
2814    if (nfserr == nfserr_symlink)
2815        nfserr = nfserr_notdir;
2816    if (nfserr)
2817        goto err_no_verf;
2818
2819    if (readdir->offset)
2820        xdr_encode_hyper(readdir->offset, offset);
2821
2822    p = readdir->buffer;
2823    *p++ = 0; /* no more entries */
2824    *p++ = htonl(readdir->common.err == nfserr_eof);
2825    resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2826        resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2827
2828    /* Use rest of head for padding and remaining ops: */
2829    resp->xbuf->tail[0].iov_base = tailbase;
2830    resp->xbuf->tail[0].iov_len = 0;
2831    resp->p = resp->xbuf->tail[0].iov_base;
2832    resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2833
2834    return 0;
2835err_no_verf:
2836    p = savep;
2837    ADJUST_ARGS();
2838    return nfserr;
2839}
2840
2841static __be32
2842nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2843{
2844    __be32 *p;
2845
2846    if (!nfserr) {
2847        RESERVE_SPACE(20);
2848        write_cinfo(&p, &remove->rm_cinfo);
2849        ADJUST_ARGS();
2850    }
2851    return nfserr;
2852}
2853
2854static __be32
2855nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2856{
2857    __be32 *p;
2858
2859    if (!nfserr) {
2860        RESERVE_SPACE(40);
2861        write_cinfo(&p, &rename->rn_sinfo);
2862        write_cinfo(&p, &rename->rn_tinfo);
2863        ADJUST_ARGS();
2864    }
2865    return nfserr;
2866}
2867
2868static __be32
2869nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2870             __be32 nfserr,struct svc_export *exp)
2871{
2872    int i = 0;
2873    u32 nflavs;
2874    struct exp_flavor_info *flavs;
2875    struct exp_flavor_info def_flavs[2];
2876    __be32 *p;
2877
2878    if (nfserr)
2879        goto out;
2880    if (exp->ex_nflavors) {
2881        flavs = exp->ex_flavors;
2882        nflavs = exp->ex_nflavors;
2883    } else { /* Handling of some defaults in absence of real secinfo: */
2884        flavs = def_flavs;
2885        if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2886            nflavs = 2;
2887            flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2888            flavs[1].pseudoflavor = RPC_AUTH_NULL;
2889        } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2890            nflavs = 1;
2891            flavs[0].pseudoflavor
2892                    = svcauth_gss_flavor(exp->ex_client);
2893        } else {
2894            nflavs = 1;
2895            flavs[0].pseudoflavor
2896                    = exp->ex_client->flavour->flavour;
2897        }
2898    }
2899
2900    RESERVE_SPACE(4);
2901    WRITE32(nflavs);
2902    ADJUST_ARGS();
2903    for (i = 0; i < nflavs; i++) {
2904        u32 flav = flavs[i].pseudoflavor;
2905        struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2906
2907        if (gm) {
2908            RESERVE_SPACE(4);
2909            WRITE32(RPC_AUTH_GSS);
2910            ADJUST_ARGS();
2911            RESERVE_SPACE(4 + gm->gm_oid.len);
2912            WRITE32(gm->gm_oid.len);
2913            WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2914            ADJUST_ARGS();
2915            RESERVE_SPACE(4);
2916            WRITE32(0); /* qop */
2917            ADJUST_ARGS();
2918            RESERVE_SPACE(4);
2919            WRITE32(gss_pseudoflavor_to_service(gm, flav));
2920            ADJUST_ARGS();
2921            gss_mech_put(gm);
2922        } else {
2923            RESERVE_SPACE(4);
2924            WRITE32(flav);
2925            ADJUST_ARGS();
2926        }
2927    }
2928out:
2929    if (exp)
2930        exp_put(exp);
2931    return nfserr;
2932}
2933
2934static __be32
2935nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2936             struct nfsd4_secinfo *secinfo)
2937{
2938    return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
2939}
2940
2941static __be32
2942nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
2943             struct nfsd4_secinfo_no_name *secinfo)
2944{
2945    return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
2946}
2947
2948/*
2949 * The SETATTR encode routine is special -- it always encodes a bitmap,
2950 * regardless of the error status.
2951 */
2952static __be32
2953nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2954{
2955    __be32 *p;
2956
2957    RESERVE_SPACE(12);
2958    if (nfserr) {
2959        WRITE32(2);
2960        WRITE32(0);
2961        WRITE32(0);
2962    }
2963    else {
2964        WRITE32(2);
2965        WRITE32(setattr->sa_bmval[0]);
2966        WRITE32(setattr->sa_bmval[1]);
2967    }
2968    ADJUST_ARGS();
2969    return nfserr;
2970}
2971
2972static __be32
2973nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2974{
2975    __be32 *p;
2976
2977    if (!nfserr) {
2978        RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2979        WRITEMEM(&scd->se_clientid, 8);
2980        WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2981        ADJUST_ARGS();
2982    }
2983    else if (nfserr == nfserr_clid_inuse) {
2984        RESERVE_SPACE(8);
2985        WRITE32(0);
2986        WRITE32(0);
2987        ADJUST_ARGS();
2988    }
2989    return nfserr;
2990}
2991
2992static __be32
2993nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2994{
2995    __be32 *p;
2996
2997    if (!nfserr) {
2998        RESERVE_SPACE(16);
2999        WRITE32(write->wr_bytes_written);
3000        WRITE32(write->wr_how_written);
3001        WRITEMEM(write->wr_verifier.data, 8);
3002        ADJUST_ARGS();
3003    }
3004    return nfserr;
3005}
3006
3007static __be32
3008nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3009             struct nfsd4_exchange_id *exid)
3010{
3011    __be32 *p;
3012    char *major_id;
3013    char *server_scope;
3014    int major_id_sz;
3015    int server_scope_sz;
3016    uint64_t minor_id = 0;
3017
3018    if (nfserr)
3019        return nfserr;
3020
3021    major_id = utsname()->nodename;
3022    major_id_sz = strlen(major_id);
3023    server_scope = utsname()->nodename;
3024    server_scope_sz = strlen(server_scope);
3025
3026    RESERVE_SPACE(
3027        8 /* eir_clientid */ +
3028        4 /* eir_sequenceid */ +
3029        4 /* eir_flags */ +
3030        4 /* spr_how (SP4_NONE) */ +
3031        8 /* so_minor_id */ +
3032        4 /* so_major_id.len */ +
3033        (XDR_QUADLEN(major_id_sz) * 4) +
3034        4 /* eir_server_scope.len */ +
3035        (XDR_QUADLEN(server_scope_sz) * 4) +
3036        4 /* eir_server_impl_id.count (0) */);
3037
3038    WRITEMEM(&exid->clientid, 8);
3039    WRITE32(exid->seqid);
3040    WRITE32(exid->flags);
3041
3042    /* state_protect4_r. Currently only support SP4_NONE */
3043    BUG_ON(exid->spa_how != SP4_NONE);
3044    WRITE32(exid->spa_how);
3045
3046    /* The server_owner struct */
3047    WRITE64(minor_id); /* Minor id */
3048    /* major id */
3049    WRITE32(major_id_sz);
3050    WRITEMEM(major_id, major_id_sz);
3051
3052    /* Server scope */
3053    WRITE32(server_scope_sz);
3054    WRITEMEM(server_scope, server_scope_sz);
3055
3056    /* Implementation id */
3057    WRITE32(0); /* zero length nfs_impl_id4 array */
3058    ADJUST_ARGS();
3059    return 0;
3060}
3061
3062static __be32
3063nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3064                struct nfsd4_create_session *sess)
3065{
3066    __be32 *p;
3067
3068    if (nfserr)
3069        return nfserr;
3070
3071    RESERVE_SPACE(24);
3072    WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3073    WRITE32(sess->seqid);
3074    WRITE32(sess->flags);
3075    ADJUST_ARGS();
3076
3077    RESERVE_SPACE(28);
3078    WRITE32(0); /* headerpadsz */
3079    WRITE32(sess->fore_channel.maxreq_sz);
3080    WRITE32(sess->fore_channel.maxresp_sz);
3081    WRITE32(sess->fore_channel.maxresp_cached);
3082    WRITE32(sess->fore_channel.maxops);
3083    WRITE32(sess->fore_channel.maxreqs);
3084    WRITE32(sess->fore_channel.nr_rdma_attrs);
3085    ADJUST_ARGS();
3086
3087    if (sess->fore_channel.nr_rdma_attrs) {
3088        RESERVE_SPACE(4);
3089        WRITE32(sess->fore_channel.rdma_attrs);
3090        ADJUST_ARGS();
3091    }
3092
3093    RESERVE_SPACE(28);
3094    WRITE32(0); /* headerpadsz */
3095    WRITE32(sess->back_channel.maxreq_sz);
3096    WRITE32(sess->back_channel.maxresp_sz);
3097    WRITE32(sess->back_channel.maxresp_cached);
3098    WRITE32(sess->back_channel.maxops);
3099    WRITE32(sess->back_channel.maxreqs);
3100    WRITE32(sess->back_channel.nr_rdma_attrs);
3101    ADJUST_ARGS();
3102
3103    if (sess->back_channel.nr_rdma_attrs) {
3104        RESERVE_SPACE(4);
3105        WRITE32(sess->back_channel.rdma_attrs);
3106        ADJUST_ARGS();
3107    }
3108    return 0;
3109}
3110
3111static __be32
3112nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3113                 struct nfsd4_destroy_session *destroy_session)
3114{
3115    return nfserr;
3116}
3117
3118static __be32
3119nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3120              struct nfsd4_sequence *seq)
3121{
3122    __be32 *p;
3123
3124    if (nfserr)
3125        return nfserr;
3126
3127    RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3128    WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3129    WRITE32(seq->seqid);
3130    WRITE32(seq->slotid);
3131    WRITE32(seq->maxslots);
3132    /* For now: target_maxslots = maxslots */
3133    WRITE32(seq->maxslots);
3134    WRITE32(seq->status_flags);
3135
3136    ADJUST_ARGS();
3137    resp->cstate.datap = p; /* DRC cache data pointer */
3138    return 0;
3139}
3140
3141static __be32
3142nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3143{
3144    return nfserr;
3145}
3146
3147typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3148
3149/*
3150 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3151 * since we don't need to filter out obsolete ops as this is
3152 * done in the decoding phase.
3153 */
3154static nfsd4_enc nfsd4_enc_ops[] = {
3155    [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3156    [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3157    [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3158    [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3159    [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3160    [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3161    [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3162    [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3163    [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3164    [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3165    [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3166    [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3167    [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3168    [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3169    [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3170    [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3171    [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3172    [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3173    [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3174    [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3175    [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3176    [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3177    [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3178    [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3179    [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3180    [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3181    [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3182    [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3183    [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3184    [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3185    [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3186    [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3187    [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3188    [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3189    [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3190    [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3191    [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3192
3193    /* NFSv4.1 operations */
3194    [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3195    [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3196    [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3197    [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3198    [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_destroy_session,
3199    [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3200    [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3201    [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3202    [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3203    [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3204    [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3205    [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3206    [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3207    [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3208    [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3209    [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3210    [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3211    [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3212    [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3213};
3214
3215/*
3216 * Calculate the total amount of memory that the compound response has taken
3217 * after encoding the current operation.
3218 *
3219 * pad: add on 8 bytes for the next operation's op_code and status so that
3220 * there is room to cache a failure on the next operation.
3221 *
3222 * Compare this length to the session se_fmaxresp_cached.
3223 *
3224 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3225 * will be at least a page and will therefore hold the xdr_buf head.
3226 */
3227static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3228{
3229    int status = 0;
3230    struct xdr_buf *xb = &resp->rqstp->rq_res;
3231    struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3232    struct nfsd4_session *session = NULL;
3233    struct nfsd4_slot *slot = resp->cstate.slot;
3234    u32 length, tlen = 0, pad = 8;
3235
3236    if (!nfsd4_has_session(&resp->cstate))
3237        return status;
3238
3239    session = resp->cstate.session;
3240    if (session == NULL || slot->sl_cachethis == 0)
3241        return status;
3242
3243    if (resp->opcnt >= args->opcnt)
3244        pad = 0; /* this is the last operation */
3245
3246    if (xb->page_len == 0) {
3247        length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3248    } else {
3249        if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3250            tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3251
3252        length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3253    }
3254    dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3255        length, xb->page_len, tlen, pad);
3256
3257    if (length <= session->se_fchannel.maxresp_cached)
3258        return status;
3259    else
3260        return nfserr_rep_too_big_to_cache;
3261}
3262
3263void
3264nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3265{
3266    __be32 *statp;
3267    __be32 *p;
3268
3269    RESERVE_SPACE(8);
3270    WRITE32(op->opnum);
3271    statp = p++; /* to be backfilled at the end */
3272    ADJUST_ARGS();
3273
3274    if (op->opnum == OP_ILLEGAL)
3275        goto status;
3276    BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3277           !nfsd4_enc_ops[op->opnum]);
3278    op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3279    /* nfsd4_check_drc_limit guarantees enough room for error status */
3280    if (!op->status && nfsd4_check_drc_limit(resp))
3281        op->status = nfserr_rep_too_big_to_cache;
3282status:
3283    /*
3284     * Note: We write the status directly, instead of using WRITE32(),
3285     * since it is already in network byte order.
3286     */
3287    *statp = op->status;
3288}
3289
3290/*
3291 * Encode the reply stored in the stateowner reply cache
3292 *
3293 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3294 * previously sent already encoded operation.
3295 *
3296 * called with nfs4_lock_state() held
3297 */
3298void
3299nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3300{
3301    __be32 *p;
3302    struct nfs4_replay *rp = op->replay;
3303
3304    BUG_ON(!rp);
3305
3306    RESERVE_SPACE(8);
3307    WRITE32(op->opnum);
3308    *p++ = rp->rp_status; /* already xdr'ed */
3309    ADJUST_ARGS();
3310
3311    RESERVE_SPACE(rp->rp_buflen);
3312    WRITEMEM(rp->rp_buf, rp->rp_buflen);
3313    ADJUST_ARGS();
3314}
3315
3316int
3317nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3318{
3319        return xdr_ressize_check(rqstp, p);
3320}
3321
3322void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3323{
3324    if (args->ops != args->iops) {
3325        kfree(args->ops);
3326        args->ops = args->iops;
3327    }
3328    kfree(args->tmpp);
3329    args->tmpp = NULL;
3330    while (args->to_free) {
3331        struct tmpbuf *tb = args->to_free;
3332        args->to_free = tb->next;
3333        tb->release(tb->buf);
3334        kfree(tb);
3335    }
3336}
3337
3338int
3339nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3340{
3341    __be32 status;
3342
3343    args->p = p;
3344    args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3345    args->pagelist = rqstp->rq_arg.pages;
3346    args->pagelen = rqstp->rq_arg.page_len;
3347    args->tmpp = NULL;
3348    args->to_free = NULL;
3349    args->ops = args->iops;
3350    args->rqstp = rqstp;
3351
3352    status = nfsd4_decode_compound(args);
3353    if (status) {
3354        nfsd4_release_compoundargs(args);
3355    }
3356    return !status;
3357}
3358
3359int
3360nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3361{
3362    /*
3363     * All that remains is to write the tag and operation count...
3364     */
3365    struct nfsd4_compound_state *cs = &resp->cstate;
3366    struct kvec *iov;
3367    p = resp->tagp;
3368    *p++ = htonl(resp->taglen);
3369    memcpy(p, resp->tag, resp->taglen);
3370    p += XDR_QUADLEN(resp->taglen);
3371    *p++ = htonl(resp->opcnt);
3372
3373    if (rqstp->rq_res.page_len)
3374        iov = &rqstp->rq_res.tail[0];
3375    else
3376        iov = &rqstp->rq_res.head[0];
3377    iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3378    BUG_ON(iov->iov_len > PAGE_SIZE);
3379    if (nfsd4_has_session(cs)) {
3380        if (cs->status != nfserr_replay_cache) {
3381            nfsd4_store_cache_entry(resp);
3382            dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3383            cs->slot->sl_inuse = false;
3384        }
3385        /* Renew the clientid on success and on replay */
3386        release_session_client(cs->session);
3387        nfsd4_put_session(cs->session);
3388    }
3389    return 1;
3390}
3391
3392/*
3393 * Local variables:
3394 * c-basic-offset: 8
3395 * End:
3396 */
3397

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