37
38/*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42#include "opt_inet.h"
43
44#include <sys/param.h>
45#include <sys/kernel.h>
46#include <sys/systm.h>
47#include <sys/resourcevar.h>
48#include <sys/proc.h>
49#include <sys/mount.h>
50#include <sys/bio.h>
51#include <sys/buf.h>
52#include <sys/jail.h>
53#include <sys/malloc.h>
54#include <sys/mbuf.h>
55#include <sys/namei.h>
56#include <sys/socket.h>
57#include <sys/vnode.h>
58#include <sys/dirent.h>
59#include <sys/fcntl.h>
60#include <sys/lockf.h>
61#include <sys/stat.h>
62#include <sys/sysctl.h>
63#include <sys/signalvar.h>
64
65#include <vm/vm.h>
66#include <vm/vm_extern.h>
67#include <vm/vm_object.h>
68
69#include <fs/nfs/nfsport.h>
70#include <fs/nfsclient/nfsnode.h>
71#include <fs/nfsclient/nfsmount.h>
72#include <fs/nfsclient/nfs.h>
73
74#include <net/if.h>
75#include <netinet/in.h>
76#include <netinet/in_var.h>
77
78#include <nfs/nfs_lock.h>
79
80/* Defs */
81#define TRUE 1
82#define FALSE 0
83
84extern struct nfsstats newnfsstats;
85extern int nfsrv_useacl;
86MALLOC_DECLARE(M_NEWNFSREQ);
87
88/*
89 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
90 * calls are not in getblk() and brelse() so that they would not be necessary
91 * here.
92 */
93#ifndef B_VMIO
94#define vfs_busy_pages(bp, f)
95#endif
96
97static vop_read_t nfsfifo_read;
98static vop_write_t nfsfifo_write;
99static vop_close_t nfsfifo_close;
100static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
101 struct thread *);
102static vop_lookup_t nfs_lookup;
103static vop_create_t nfs_create;
104static vop_mknod_t nfs_mknod;
105static vop_open_t nfs_open;
106static vop_pathconf_t nfs_pathconf;
107static vop_close_t nfs_close;
108static vop_access_t nfs_access;
109static vop_getattr_t nfs_getattr;
110static vop_setattr_t nfs_setattr;
111static vop_read_t nfs_read;
112static vop_fsync_t nfs_fsync;
113static vop_remove_t nfs_remove;
114static vop_link_t nfs_link;
115static vop_rename_t nfs_rename;
116static vop_mkdir_t nfs_mkdir;
117static vop_rmdir_t nfs_rmdir;
118static vop_symlink_t nfs_symlink;
119static vop_readdir_t nfs_readdir;
120static vop_strategy_t nfs_strategy;
121static vop_lock1_t nfs_lock1;
122static int nfs_lookitup(struct vnode *, char *, int,
123 struct ucred *, struct thread *, struct nfsnode **);
124static int nfs_sillyrename(struct vnode *, struct vnode *,
125 struct componentname *);
126static vop_access_t nfsspec_access;
127static vop_readlink_t nfs_readlink;
128static vop_print_t nfs_print;
129static vop_advlock_t nfs_advlock;
130static vop_advlockasync_t nfs_advlockasync;
131static vop_getacl_t nfs_getacl;
132static vop_setacl_t nfs_setacl;
133
134/*
135 * Global vfs data structures for nfs
136 */
137struct vop_vector newnfs_vnodeops = {
138 .vop_default = &default_vnodeops,
139 .vop_access = nfs_access,
140 .vop_advlock = nfs_advlock,
141 .vop_advlockasync = nfs_advlockasync,
142 .vop_close = nfs_close,
143 .vop_create = nfs_create,
144 .vop_fsync = nfs_fsync,
145 .vop_getattr = nfs_getattr,
146 .vop_getpages = ncl_getpages,
147 .vop_putpages = ncl_putpages,
148 .vop_inactive = ncl_inactive,
149 .vop_link = nfs_link,
150 .vop_lock1 = nfs_lock1,
151 .vop_lookup = nfs_lookup,
152 .vop_mkdir = nfs_mkdir,
153 .vop_mknod = nfs_mknod,
154 .vop_open = nfs_open,
155 .vop_pathconf = nfs_pathconf,
156 .vop_print = nfs_print,
157 .vop_read = nfs_read,
158 .vop_readdir = nfs_readdir,
159 .vop_readlink = nfs_readlink,
160 .vop_reclaim = ncl_reclaim,
161 .vop_remove = nfs_remove,
162 .vop_rename = nfs_rename,
163 .vop_rmdir = nfs_rmdir,
164 .vop_setattr = nfs_setattr,
165 .vop_strategy = nfs_strategy,
166 .vop_symlink = nfs_symlink,
167 .vop_write = ncl_write,
168 .vop_getacl = nfs_getacl,
169 .vop_setacl = nfs_setacl,
170};
171
172struct vop_vector newnfs_fifoops = {
173 .vop_default = &fifo_specops,
174 .vop_access = nfsspec_access,
175 .vop_close = nfsfifo_close,
176 .vop_fsync = nfs_fsync,
177 .vop_getattr = nfs_getattr,
178 .vop_inactive = ncl_inactive,
179 .vop_print = nfs_print,
180 .vop_read = nfsfifo_read,
181 .vop_reclaim = ncl_reclaim,
182 .vop_setattr = nfs_setattr,
183 .vop_write = nfsfifo_write,
184};
185
186static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
187 struct componentname *cnp, struct vattr *vap);
188static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
189 int namelen, struct ucred *cred, struct thread *td);
190static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
191 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
192 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
193static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
194 struct componentname *scnp, struct sillyrename *sp);
195
196/*
197 * Global variables
198 */
199#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
200
201SYSCTL_DECL(_vfs_nfs);
202
203static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
204SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
205 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
206
207static int nfs_prime_access_cache = 0;
208SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
209 &nfs_prime_access_cache, 0,
210 "Prime NFS ACCESS cache when fetching attributes");
211
212static int newnfs_commit_on_close = 0;
213SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
214 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
215
216static int nfs_clean_pages_on_close = 1;
217SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
218 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
219
220int newnfs_directio_enable = 0;
221SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
222 &newnfs_directio_enable, 0, "Enable NFS directio");
223
224/*
225 * This sysctl allows other processes to mmap a file that has been opened
226 * O_DIRECT by a process. In general, having processes mmap the file while
227 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
228 * this by default to prevent DoS attacks - to prevent a malicious user from
229 * opening up files O_DIRECT preventing other users from mmap'ing these
230 * files. "Protected" environments where stricter consistency guarantees are
231 * required can disable this knob. The process that opened the file O_DIRECT
232 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
233 * meaningful.
234 */
235int newnfs_directio_allow_mmap = 1;
236SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
237 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
238
239#if 0
240SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
241 &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
242
243SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
244 &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
245#endif
246
247#define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
248 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
249 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
250
251/*
252 * SMP Locking Note :
253 * The list of locks after the description of the lock is the ordering
254 * of other locks acquired with the lock held.
255 * np->n_mtx : Protects the fields in the nfsnode.
256 VM Object Lock
257 VI_MTX (acquired indirectly)
258 * nmp->nm_mtx : Protects the fields in the nfsmount.
259 rep->r_mtx
260 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
261 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
262 nmp->nm_mtx
263 rep->r_mtx
264 * rep->r_mtx : Protects the fields in an nfsreq.
265 */
266
267static int
268nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
269 struct ucred *cred, u_int32_t *retmode)
270{
271 int error = 0, attrflag, i, lrupos;
272 u_int32_t rmode;
273 struct nfsnode *np = VTONFS(vp);
274 struct nfsvattr nfsva;
275
276 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
277 &rmode, NULL);
278 if (attrflag)
279 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
280 if (!error) {
281 lrupos = 0;
282 mtx_lock(&np->n_mtx);
283 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
284 if (np->n_accesscache[i].uid == cred->cr_uid) {
285 np->n_accesscache[i].mode = rmode;
286 np->n_accesscache[i].stamp = time_second;
287 break;
288 }
289 if (i > 0 && np->n_accesscache[i].stamp <
290 np->n_accesscache[lrupos].stamp)
291 lrupos = i;
292 }
293 if (i == NFS_ACCESSCACHESIZE) {
294 np->n_accesscache[lrupos].uid = cred->cr_uid;
295 np->n_accesscache[lrupos].mode = rmode;
296 np->n_accesscache[lrupos].stamp = time_second;
297 }
298 mtx_unlock(&np->n_mtx);
299 if (retmode != NULL)
300 *retmode = rmode;
301 } else if (NFS_ISV4(vp)) {
302 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
303 }
304 return (error);
305}
306
307/*
308 * nfs access vnode op.
309 * For nfs version 2, just return ok. File accesses may fail later.
310 * For nfs version 3, use the access rpc to check accessibility. If file modes
311 * are changed on the server, accesses might still fail later.
312 */
313static int
314nfs_access(struct vop_access_args *ap)
315{
316 struct vnode *vp = ap->a_vp;
317 int error = 0, i, gotahit;
318 u_int32_t mode, wmode, rmode;
319 int v34 = NFS_ISV34(vp);
320 struct nfsnode *np = VTONFS(vp);
321
322 /*
323 * Disallow write attempts on filesystems mounted read-only;
324 * unless the file is a socket, fifo, or a block or character
325 * device resident on the filesystem.
326 */
327 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
328 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
329 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
330 switch (vp->v_type) {
331 case VREG:
332 case VDIR:
333 case VLNK:
334 return (EROFS);
335 default:
336 break;
337 }
338 }
339 /*
340 * For nfs v3 or v4, check to see if we have done this recently, and if
341 * so return our cached result instead of making an ACCESS call.
342 * If not, do an access rpc, otherwise you are stuck emulating
343 * ufs_access() locally using the vattr. This may not be correct,
344 * since the server may apply other access criteria such as
345 * client uid-->server uid mapping that we do not know about.
346 */
347 if (v34) {
348 if (ap->a_accmode & VREAD)
349 mode = NFSACCESS_READ;
350 else
351 mode = 0;
352 if (vp->v_type != VDIR) {
353 if (ap->a_accmode & VWRITE)
354 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
355 if (ap->a_accmode & VAPPEND)
356 mode |= NFSACCESS_EXTEND;
357 if (ap->a_accmode & VEXEC)
358 mode |= NFSACCESS_EXECUTE;
359 if (ap->a_accmode & VDELETE)
360 mode |= NFSACCESS_DELETE;
361 } else {
362 if (ap->a_accmode & VWRITE)
363 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
364 if (ap->a_accmode & VAPPEND)
365 mode |= NFSACCESS_EXTEND;
366 if (ap->a_accmode & VEXEC)
367 mode |= NFSACCESS_LOOKUP;
368 if (ap->a_accmode & VDELETE)
369 mode |= NFSACCESS_DELETE;
370 if (ap->a_accmode & VDELETE_CHILD)
371 mode |= NFSACCESS_MODIFY;
372 }
373 /* XXX safety belt, only make blanket request if caching */
374 if (nfsaccess_cache_timeout > 0) {
375 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
376 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
377 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
378 } else {
379 wmode = mode;
380 }
381
382 /*
383 * Does our cached result allow us to give a definite yes to
384 * this request?
385 */
386 gotahit = 0;
387 mtx_lock(&np->n_mtx);
388 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
389 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
390 if (time_second < (np->n_accesscache[i].stamp
391 + nfsaccess_cache_timeout) &&
392 (np->n_accesscache[i].mode & mode) == mode) {
393 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
394 gotahit = 1;
395 }
396 break;
397 }
398 }
399 mtx_unlock(&np->n_mtx);
400 if (gotahit == 0) {
401 /*
402 * Either a no, or a don't know. Go to the wire.
403 */
404 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
405 error = nfs34_access_otw(vp, wmode, ap->a_td,
406 ap->a_cred, &rmode);
407 if (!error &&
408 (rmode & mode) != mode)
409 error = EACCES;
410 }
411 return (error);
412 } else {
413 if ((error = nfsspec_access(ap)) != 0) {
414 return (error);
415 }
416 /*
417 * Attempt to prevent a mapped root from accessing a file
418 * which it shouldn't. We try to read a byte from the file
419 * if the user is root and the file is not zero length.
420 * After calling nfsspec_access, we should have the correct
421 * file size cached.
422 */
423 mtx_lock(&np->n_mtx);
424 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
425 && VTONFS(vp)->n_size > 0) {
426 struct iovec aiov;
427 struct uio auio;
428 char buf[1];
429
430 mtx_unlock(&np->n_mtx);
431 aiov.iov_base = buf;
432 aiov.iov_len = 1;
433 auio.uio_iov = &aiov;
434 auio.uio_iovcnt = 1;
435 auio.uio_offset = 0;
436 auio.uio_resid = 1;
437 auio.uio_segflg = UIO_SYSSPACE;
438 auio.uio_rw = UIO_READ;
439 auio.uio_td = ap->a_td;
440
441 if (vp->v_type == VREG)
442 error = ncl_readrpc(vp, &auio, ap->a_cred);
443 else if (vp->v_type == VDIR) {
444 char* bp;
445 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
446 aiov.iov_base = bp;
447 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
448 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
449 ap->a_td);
450 free(bp, M_TEMP);
451 } else if (vp->v_type == VLNK)
452 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
453 else
454 error = EACCES;
455 } else
456 mtx_unlock(&np->n_mtx);
457 return (error);
458 }
459}
460
461
462/*
463 * nfs open vnode op
464 * Check to see if the type is ok
465 * and that deletion is not in progress.
466 * For paged in text files, you will need to flush the page cache
467 * if consistency is lost.
468 */
469/* ARGSUSED */
470static int
471nfs_open(struct vop_open_args *ap)
472{
473 struct vnode *vp = ap->a_vp;
474 struct nfsnode *np = VTONFS(vp);
475 struct vattr vattr;
476 int error;
477 int fmode = ap->a_mode;
478
479 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
480 return (EOPNOTSUPP);
481
482 /*
483 * For NFSv4, we need to do the Open Op before cache validation,
484 * so that we conform to RFC3530 Sec. 9.3.1.
485 */
486 if (NFS_ISV4(vp)) {
487 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
488 if (error) {
489 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
490 (gid_t)0);
491 return (error);
492 }
493 }
494
495 /*
496 * Now, if this Open will be doing reading, re-validate/flush the
497 * cache, so that Close/Open coherency is maintained.
498 */
499 mtx_lock(&np->n_mtx);
500 if (np->n_flag & NMODIFIED) {
501 mtx_unlock(&np->n_mtx);
502 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
503 if (error == EINTR || error == EIO) {
504 if (NFS_ISV4(vp))
505 (void) nfsrpc_close(vp, 0, ap->a_td);
506 return (error);
507 }
508 mtx_lock(&np->n_mtx);
509 np->n_attrstamp = 0;
510 if (vp->v_type == VDIR)
511 np->n_direofoffset = 0;
512 mtx_unlock(&np->n_mtx);
513 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
514 if (error) {
515 if (NFS_ISV4(vp))
516 (void) nfsrpc_close(vp, 0, ap->a_td);
517 return (error);
518 }
519 mtx_lock(&np->n_mtx);
520 np->n_mtime = vattr.va_mtime;
521 if (NFS_ISV4(vp))
522 np->n_change = vattr.va_filerev;
523 } else {
524 mtx_unlock(&np->n_mtx);
525 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
526 if (error) {
527 if (NFS_ISV4(vp))
528 (void) nfsrpc_close(vp, 0, ap->a_td);
529 return (error);
530 }
531 mtx_lock(&np->n_mtx);
532 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
533 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
534 if (vp->v_type == VDIR)
535 np->n_direofoffset = 0;
536 mtx_unlock(&np->n_mtx);
537 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
538 if (error == EINTR || error == EIO) {
539 if (NFS_ISV4(vp))
540 (void) nfsrpc_close(vp, 0, ap->a_td);
541 return (error);
542 }
543 mtx_lock(&np->n_mtx);
544 np->n_mtime = vattr.va_mtime;
545 if (NFS_ISV4(vp))
546 np->n_change = vattr.va_filerev;
547 }
548 }
549
550 /*
551 * If the object has >= 1 O_DIRECT active opens, we disable caching.
552 */
553 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
554 (vp->v_type == VREG)) {
555 if (np->n_directio_opens == 0) {
556 mtx_unlock(&np->n_mtx);
557 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
558 if (error) {
559 if (NFS_ISV4(vp))
560 (void) nfsrpc_close(vp, 0, ap->a_td);
561 return (error);
562 }
563 mtx_lock(&np->n_mtx);
564 np->n_flag |= NNONCACHE;
565 }
566 np->n_directio_opens++;
567 }
568 mtx_unlock(&np->n_mtx);
569 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
570 return (0);
571}
572
573/*
574 * nfs close vnode op
575 * What an NFS client should do upon close after writing is a debatable issue.
576 * Most NFS clients push delayed writes to the server upon close, basically for
577 * two reasons:
578 * 1 - So that any write errors may be reported back to the client process
579 * doing the close system call. By far the two most likely errors are
580 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
581 * 2 - To put a worst case upper bound on cache inconsistency between
582 * multiple clients for the file.
583 * There is also a consistency problem for Version 2 of the protocol w.r.t.
584 * not being able to tell if other clients are writing a file concurrently,
585 * since there is no way of knowing if the changed modify time in the reply
586 * is only due to the write for this client.
587 * (NFS Version 3 provides weak cache consistency data in the reply that
588 * should be sufficient to detect and handle this case.)
589 *
590 * The current code does the following:
591 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
592 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
593 * or commit them (this satisfies 1 and 2 except for the
594 * case where the server crashes after this close but
595 * before the commit RPC, which is felt to be "good
596 * enough". Changing the last argument to ncl_flush() to
597 * a 1 would force a commit operation, if it is felt a
598 * commit is necessary now.
599 * for NFS Version 4 - flush the dirty buffers and commit them, if
600 * nfscl_mustflush() says this is necessary.
601 * It is necessary if there is no write delegation held,
602 * in order to satisfy open/close coherency.
603 * If the file isn't cached on local stable storage,
604 * it may be necessary in order to detect "out of space"
605 * errors from the server, if the write delegation
606 * issued by the server doesn't allow the file to grow.
607 */
608/* ARGSUSED */
609static int
610nfs_close(struct vop_close_args *ap)
611{
612 struct vnode *vp = ap->a_vp;
613 struct nfsnode *np = VTONFS(vp);
614 struct nfsvattr nfsva;
615 struct ucred *cred;
616 int error = 0, ret, localcred = 0;
617 int fmode = ap->a_fflag;
618
619 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
620 return (0);
621 /*
622 * During shutdown, a_cred isn't valid, so just use root.
623 */
624 if (ap->a_cred == NOCRED) {
625 cred = newnfs_getcred();
626 localcred = 1;
627 } else {
628 cred = ap->a_cred;
629 }
630 if (vp->v_type == VREG) {
631 /*
632 * Examine and clean dirty pages, regardless of NMODIFIED.
633 * This closes a major hole in close-to-open consistency.
634 * We want to push out all dirty pages (and buffers) on
635 * close, regardless of whether they were dirtied by
636 * mmap'ed writes or via write().
637 */
638 if (nfs_clean_pages_on_close && vp->v_object) {
639 VM_OBJECT_LOCK(vp->v_object);
640 vm_object_page_clean(vp->v_object, 0, 0, 0);
641 VM_OBJECT_UNLOCK(vp->v_object);
642 }
643 mtx_lock(&np->n_mtx);
644 if (np->n_flag & NMODIFIED) {
645 mtx_unlock(&np->n_mtx);
646 if (NFS_ISV3(vp)) {
647 /*
648 * Under NFSv3 we have dirty buffers to dispose of. We
649 * must flush them to the NFS server. We have the option
650 * of waiting all the way through the commit rpc or just
651 * waiting for the initial write. The default is to only
652 * wait through the initial write so the data is in the
653 * server's cache, which is roughly similar to the state
654 * a standard disk subsystem leaves the file in on close().
655 *
656 * We cannot clear the NMODIFIED bit in np->n_flag due to
657 * potential races with other processes, and certainly
658 * cannot clear it if we don't commit.
659 * These races occur when there is no longer the old
660 * traditional vnode locking implemented for Vnode Ops.
661 */
662 int cm = newnfs_commit_on_close ? 1 : 0;
663 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
664 /* np->n_flag &= ~NMODIFIED; */
665 } else if (NFS_ISV4(vp)) {
666 if (nfscl_mustflush(vp) != 0) {
667 int cm = newnfs_commit_on_close ? 1 : 0;
668 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
669 cm, 0);
670 /*
671 * as above w.r.t races when clearing
672 * NMODIFIED.
673 * np->n_flag &= ~NMODIFIED;
674 */
675 }
676 } else
677 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
678 mtx_lock(&np->n_mtx);
679 }
680 /*
681 * Invalidate the attribute cache in all cases.
682 * An open is going to fetch fresh attrs any way, other procs
683 * on this node that have file open will be forced to do an
684 * otw attr fetch, but this is safe.
685 * --> A user found that their RPC count dropped by 20% when
686 * this was commented out and I can't see any requirement
687 * for it, so I've disabled it when negative lookups are
688 * enabled. (What does this have to do with negative lookup
689 * caching? Well nothing, except it was reported by the
690 * same user that needed negative lookup caching and I wanted
691 * there to be a way to disable it to see if it
692 * is the cause of some caching/coherency issue that might
693 * crop up.)
694 */
695 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0)
696 np->n_attrstamp = 0;
697 if (np->n_flag & NWRITEERR) {
698 np->n_flag &= ~NWRITEERR;
699 error = np->n_error;
700 }
701 mtx_unlock(&np->n_mtx);
702 }
703
704 if (NFS_ISV4(vp)) {
705 /*
706 * Get attributes so "change" is up to date.
707 */
708 if (error == 0 && nfscl_mustflush(vp) != 0) {
709 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
710 NULL);
711 if (!ret) {
712 np->n_change = nfsva.na_filerev;
713 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
714 NULL, 0, 0);
715 }
716 }
717
718 /*
719 * and do the close.
720 */
721 ret = nfsrpc_close(vp, 0, ap->a_td);
722 if (!error && ret)
723 error = ret;
724 if (error)
725 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
726 (gid_t)0);
727 }
728 if (newnfs_directio_enable)
729 KASSERT((np->n_directio_asyncwr == 0),
730 ("nfs_close: dirty unflushed (%d) directio buffers\n",
731 np->n_directio_asyncwr));
732 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
733 mtx_lock(&np->n_mtx);
734 KASSERT((np->n_directio_opens > 0),
735 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
736 np->n_directio_opens--;
737 if (np->n_directio_opens == 0)
738 np->n_flag &= ~NNONCACHE;
739 mtx_unlock(&np->n_mtx);
740 }
741 if (localcred)
742 NFSFREECRED(cred);
743 return (error);
744}
745
746/*
747 * nfs getattr call from vfs.
748 */
749static int
750nfs_getattr(struct vop_getattr_args *ap)
751{
752 struct vnode *vp = ap->a_vp;
753 struct thread *td = curthread; /* XXX */
754 struct nfsnode *np = VTONFS(vp);
755 int error = 0;
756 struct nfsvattr nfsva;
757 struct vattr *vap = ap->a_vap;
758 struct vattr vattr;
759
760 /*
761 * Update local times for special files.
762 */
763 mtx_lock(&np->n_mtx);
764 if (np->n_flag & (NACC | NUPD))
765 np->n_flag |= NCHG;
766 mtx_unlock(&np->n_mtx);
767 /*
768 * First look in the cache.
769 */
770 if (ncl_getattrcache(vp, &vattr) == 0) {
771 vap->va_type = vattr.va_type;
772 vap->va_mode = vattr.va_mode;
773 vap->va_nlink = vattr.va_nlink;
774 vap->va_uid = vattr.va_uid;
775 vap->va_gid = vattr.va_gid;
776 vap->va_fsid = vattr.va_fsid;
777 vap->va_fileid = vattr.va_fileid;
778 vap->va_size = vattr.va_size;
779 vap->va_blocksize = vattr.va_blocksize;
780 vap->va_atime = vattr.va_atime;
781 vap->va_mtime = vattr.va_mtime;
782 vap->va_ctime = vattr.va_ctime;
783 vap->va_gen = vattr.va_gen;
784 vap->va_flags = vattr.va_flags;
785 vap->va_rdev = vattr.va_rdev;
786 vap->va_bytes = vattr.va_bytes;
787 vap->va_filerev = vattr.va_filerev;
788 /*
789 * Get the local modify time for the case of a write
790 * delegation.
791 */
792 nfscl_deleggetmodtime(vp, &vap->va_mtime);
793 return (0);
794 }
795
796 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
797 nfsaccess_cache_timeout > 0) {
798 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
799 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
800 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
801 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
802 return (0);
803 }
804 }
805 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
806 if (!error)
807 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
808 if (!error) {
809 /*
810 * Get the local modify time for the case of a write
811 * delegation.
812 */
813 nfscl_deleggetmodtime(vp, &vap->va_mtime);
814 } else if (NFS_ISV4(vp)) {
815 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
816 }
817 return (error);
818}
819
820/*
821 * nfs setattr call.
822 */
823static int
824nfs_setattr(struct vop_setattr_args *ap)
825{
826 struct vnode *vp = ap->a_vp;
827 struct nfsnode *np = VTONFS(vp);
828 struct thread *td = curthread; /* XXX */
829 struct vattr *vap = ap->a_vap;
830 int error = 0;
831 u_quad_t tsize;
832
833#ifndef nolint
834 tsize = (u_quad_t)0;
835#endif
836
837 /*
838 * Setting of flags and marking of atimes are not supported.
839 */
840 if (vap->va_flags != VNOVAL)
841 return (EOPNOTSUPP);
842
843 /*
844 * Disallow write attempts if the filesystem is mounted read-only.
845 */
846 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
847 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
848 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
849 (vp->v_mount->mnt_flag & MNT_RDONLY))
850 return (EROFS);
851 if (vap->va_size != VNOVAL) {
852 switch (vp->v_type) {
853 case VDIR:
854 return (EISDIR);
855 case VCHR:
856 case VBLK:
857 case VSOCK:
858 case VFIFO:
859 if (vap->va_mtime.tv_sec == VNOVAL &&
860 vap->va_atime.tv_sec == VNOVAL &&
861 vap->va_mode == (mode_t)VNOVAL &&
862 vap->va_uid == (uid_t)VNOVAL &&
863 vap->va_gid == (gid_t)VNOVAL)
864 return (0);
865 vap->va_size = VNOVAL;
866 break;
867 default:
868 /*
869 * Disallow write attempts if the filesystem is
870 * mounted read-only.
871 */
872 if (vp->v_mount->mnt_flag & MNT_RDONLY)
873 return (EROFS);
874 /*
875 * We run vnode_pager_setsize() early (why?),
876 * we must set np->n_size now to avoid vinvalbuf
877 * V_SAVE races that might setsize a lower
878 * value.
879 */
880 mtx_lock(&np->n_mtx);
881 tsize = np->n_size;
882 mtx_unlock(&np->n_mtx);
883 error = ncl_meta_setsize(vp, ap->a_cred, td,
884 vap->va_size);
885 mtx_lock(&np->n_mtx);
886 if (np->n_flag & NMODIFIED) {
887 tsize = np->n_size;
888 mtx_unlock(&np->n_mtx);
889 if (vap->va_size == 0)
890 error = ncl_vinvalbuf(vp, 0, td, 1);
891 else
892 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
893 if (error) {
894 vnode_pager_setsize(vp, tsize);
895 return (error);
896 }
897 /*
898 * Call nfscl_delegmodtime() to set the modify time
899 * locally, as required.
900 */
901 nfscl_delegmodtime(vp);
902 } else
903 mtx_unlock(&np->n_mtx);
904 /*
905 * np->n_size has already been set to vap->va_size
906 * in ncl_meta_setsize(). We must set it again since
907 * nfs_loadattrcache() could be called through
908 * ncl_meta_setsize() and could modify np->n_size.
909 */
910 mtx_lock(&np->n_mtx);
911 np->n_vattr.na_size = np->n_size = vap->va_size;
912 mtx_unlock(&np->n_mtx);
913 };
914 } else {
915 mtx_lock(&np->n_mtx);
916 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
917 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
918 mtx_unlock(&np->n_mtx);
919 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
920 (error == EINTR || error == EIO))
921 return (error);
922 } else
923 mtx_unlock(&np->n_mtx);
924 }
925 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
926 if (error && vap->va_size != VNOVAL) {
927 mtx_lock(&np->n_mtx);
928 np->n_size = np->n_vattr.na_size = tsize;
929 vnode_pager_setsize(vp, tsize);
930 mtx_unlock(&np->n_mtx);
931 }
932 return (error);
933}
934
935/*
936 * Do an nfs setattr rpc.
937 */
938static int
939nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
940 struct thread *td)
941{
942 struct nfsnode *np = VTONFS(vp);
943 int error, ret, attrflag, i;
944 struct nfsvattr nfsva;
945
946 if (NFS_ISV34(vp)) {
947 mtx_lock(&np->n_mtx);
948 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
949 np->n_accesscache[i].stamp = 0;
950 np->n_flag |= NDELEGMOD;
951 mtx_unlock(&np->n_mtx);
952 }
953 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
954 NULL);
955 if (attrflag) {
956 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
957 if (ret && !error)
958 error = ret;
959 }
960 if (error && NFS_ISV4(vp))
961 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
962 return (error);
963}
964
965/*
966 * nfs lookup call, one step at a time...
967 * First look in cache
968 * If not found, unlock the directory nfsnode and do the rpc
969 */
970static int
971nfs_lookup(struct vop_lookup_args *ap)
972{
973 struct componentname *cnp = ap->a_cnp;
974 struct vnode *dvp = ap->a_dvp;
975 struct vnode **vpp = ap->a_vpp;
976 struct mount *mp = dvp->v_mount;
977 int flags = cnp->cn_flags;
978 struct vnode *newvp;
979 struct nfsmount *nmp;
980 struct nfsnode *np, *newnp;
981 int error = 0, attrflag, dattrflag, ltype;
982 struct thread *td = cnp->cn_thread;
983 struct nfsfh *nfhp;
984 struct nfsvattr dnfsva, nfsva;
985 struct vattr vattr;
986 struct timespec dmtime;
987
988 *vpp = NULLVP;
989 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
990 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
991 return (EROFS);
992 if (dvp->v_type != VDIR)
993 return (ENOTDIR);
994 nmp = VFSTONFS(mp);
995 np = VTONFS(dvp);
996
997 /* For NFSv4, wait until any remove is done. */
998 mtx_lock(&np->n_mtx);
999 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1000 np->n_flag |= NREMOVEWANT;
1001 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1002 }
1003 mtx_unlock(&np->n_mtx);
1004
1005 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
1006 return (error);
1007 error = cache_lookup(dvp, vpp, cnp);
1008 if (error > 0 && error != ENOENT)
1009 return (error);
1010 if (error == -1) {
1011 /*
1012 * We only accept a positive hit in the cache if the
1013 * change time of the file matches our cached copy.
1014 * Otherwise, we discard the cache entry and fallback
1015 * to doing a lookup RPC.
1016 *
1017 * To better handle stale file handles and attributes,
1018 * clear the attribute cache of this node if it is a
1019 * leaf component, part of an open() call, and not
1020 * locally modified before fetching the attributes.
1021 * This should allow stale file handles to be detected
1022 * here where we can fall back to a LOOKUP RPC to
1023 * recover rather than having nfs_open() detect the
1024 * stale file handle and failing open(2) with ESTALE.
1025 */
1026 newvp = *vpp;
1027 newnp = VTONFS(newvp);
1028 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1029 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1030 !(newnp->n_flag & NMODIFIED)) {
1031 mtx_lock(&newnp->n_mtx);
1032 newnp->n_attrstamp = 0;
1033 mtx_unlock(&newnp->n_mtx);
1034 }
1035 if (nfscl_nodeleg(newvp, 0) == 0 ||
1036 (VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1037 timespeccmp(&vattr.va_ctime, &newnp->n_ctime, ==))) {
1038 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1039 if (cnp->cn_nameiop != LOOKUP &&
1040 (flags & ISLASTCN))
1041 cnp->cn_flags |= SAVENAME;
1042 return (0);
1043 }
1044 cache_purge(newvp);
1045 if (dvp != newvp)
1046 vput(newvp);
1047 else
1048 vrele(newvp);
1049 *vpp = NULLVP;
1050 } else if (error == ENOENT) {
1051 if (dvp->v_iflag & VI_DOOMED)
1052 return (ENOENT);
1053 /*
1054 * We only accept a negative hit in the cache if the
1055 * modification time of the parent directory matches
1056 * our cached copy. Otherwise, we discard all of the
1057 * negative cache entries for this directory. We also
1058 * only trust -ve cache entries for less than
1059 * nm_negative_namecache_timeout seconds.
1060 */
1061 if ((u_int)(ticks - np->n_dmtime_ticks) <
1062 (nmp->nm_negnametimeo * hz) &&
1063 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1064 timespeccmp(&vattr.va_mtime, &np->n_dmtime, ==)) {
1065 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1066 return (ENOENT);
1067 }
1068 cache_purge_negative(dvp);
1069 mtx_lock(&np->n_mtx);
1070 timespecclear(&np->n_dmtime);
1071 mtx_unlock(&np->n_mtx);
1072 }
1073
1074 /*
1075 * Cache the modification time of the parent directory in case
1076 * the lookup fails and results in adding the first negative
1077 * name cache entry for the directory. Since this is reading
1078 * a single time_t, don't bother with locking. The
1079 * modification time may be a bit stale, but it must be read
1080 * before performing the lookup RPC to prevent a race where
1081 * another lookup updates the timestamp on the directory after
1082 * the lookup RPC has been performed on the server but before
1083 * n_dmtime is set at the end of this function.
1084 */
1085 dmtime = np->n_vattr.na_mtime;
1086 error = 0;
1087 newvp = NULLVP;
1088 NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
1089 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1090 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1091 NULL);
1092 if (dattrflag)
1093 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1094 if (error) {
1095 if (newvp != NULLVP) {
1096 vput(newvp);
1097 *vpp = NULLVP;
1098 }
1099
1100 if (error != ENOENT) {
1101 if (NFS_ISV4(dvp))
1102 error = nfscl_maperr(td, error, (uid_t)0,
1103 (gid_t)0);
1104 return (error);
1105 }
1106
1107 /* The requested file was not found. */
1108 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1109 (flags & ISLASTCN)) {
1110 /*
1111 * XXX: UFS does a full VOP_ACCESS(dvp,
1112 * VWRITE) here instead of just checking
1113 * MNT_RDONLY.
1114 */
1115 if (mp->mnt_flag & MNT_RDONLY)
1116 return (EROFS);
1117 cnp->cn_flags |= SAVENAME;
1118 return (EJUSTRETURN);
1119 }
1120
1121 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) {
1122 /*
1123 * Maintain n_dmtime as the modification time
1124 * of the parent directory when the oldest -ve
1125 * name cache entry for this directory was
1126 * added. If a -ve cache entry has already
1127 * been added with a newer modification time
1128 * by a concurrent lookup, then don't bother
1129 * adding a cache entry. The modification
1130 * time of the directory might have changed
1131 * due to the file this lookup failed to find
1132 * being created. In that case a subsequent
1133 * lookup would incorrectly use the entry
1134 * added here instead of doing an extra
1135 * lookup.
1136 */
1137 mtx_lock(&np->n_mtx);
1138 if (timespeccmp(&np->n_dmtime, &dmtime, <=)) {
1139 if (!timespecisset(&np->n_dmtime)) {
1140 np->n_dmtime = dmtime;
1141 np->n_dmtime_ticks = ticks;
1142 }
1143 mtx_unlock(&np->n_mtx);
1144 cache_enter(dvp, NULL, cnp);
1145 } else
1146 mtx_unlock(&np->n_mtx);
1147 }
1148 return (ENOENT);
1149 }
1150
1151 /*
1152 * Handle RENAME case...
1153 */
1154 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1155 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1156 FREE((caddr_t)nfhp, M_NFSFH);
1157 return (EISDIR);
1158 }
1159 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1160 LK_EXCLUSIVE);
1161 if (error)
1162 return (error);
1163 newvp = NFSTOV(np);
1164 if (attrflag)
1165 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1166 0, 1);
1167 *vpp = newvp;
1168 cnp->cn_flags |= SAVENAME;
1169 return (0);
1170 }
1171
1172 if (flags & ISDOTDOT) {
1173 ltype = VOP_ISLOCKED(dvp);
1174 error = vfs_busy(mp, MBF_NOWAIT);
1175 if (error != 0) {
1176 vfs_ref(mp);
1177 VOP_UNLOCK(dvp, 0);
1178 error = vfs_busy(mp, 0);
1179 vn_lock(dvp, ltype | LK_RETRY);
1180 vfs_rel(mp);
1181 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1182 vfs_unbusy(mp);
1183 error = ENOENT;
1184 }
1185 if (error != 0)
1186 return (error);
1187 }
1188 VOP_UNLOCK(dvp, 0);
1189 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1190 cnp->cn_lkflags);
1191 if (error == 0)
1192 newvp = NFSTOV(np);
1193 vfs_unbusy(mp);
1194 if (newvp != dvp)
1195 vn_lock(dvp, ltype | LK_RETRY);
1196 if (dvp->v_iflag & VI_DOOMED) {
1197 if (error == 0) {
1198 if (newvp == dvp)
1199 vrele(newvp);
1200 else
1201 vput(newvp);
1202 }
1203 error = ENOENT;
1204 }
1205 if (error != 0)
1206 return (error);
1207 if (attrflag)
1208 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1209 0, 1);
1210 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1211 FREE((caddr_t)nfhp, M_NFSFH);
1212 VREF(dvp);
1213 newvp = dvp;
1214 if (attrflag)
1215 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1216 0, 1);
1217 } else {
1218 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1219 cnp->cn_lkflags);
1220 if (error)
1221 return (error);
1222 newvp = NFSTOV(np);
1223 if (attrflag)
1224 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1225 0, 1);
1226 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1227 !(np->n_flag & NMODIFIED)) {
1228 /*
1229 * Flush the attribute cache when opening a
1230 * leaf node to ensure that fresh attributes
1231 * are fetched in nfs_open() since we did not
1232 * fetch attributes from the LOOKUP reply.
1233 */
1234 mtx_lock(&np->n_mtx);
1235 np->n_attrstamp = 0;
1236 mtx_unlock(&np->n_mtx);
1237 }
1238 }
1239 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1240 cnp->cn_flags |= SAVENAME;
1241 if ((cnp->cn_flags & MAKEENTRY) &&
1242 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
1243 np->n_ctime = np->n_vattr.na_vattr.va_ctime;
1244 cache_enter(dvp, newvp, cnp);
1245 }
1246 *vpp = newvp;
1247 return (0);
1248}
1249
1250/*
1251 * nfs read call.
1252 * Just call ncl_bioread() to do the work.
1253 */
1254static int
1255nfs_read(struct vop_read_args *ap)
1256{
1257 struct vnode *vp = ap->a_vp;
1258
1259 switch (vp->v_type) {
1260 case VREG:
1261 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1262 case VDIR:
1263 return (EISDIR);
1264 default:
1265 return (EOPNOTSUPP);
1266 }
1267}
1268
1269/*
1270 * nfs readlink call
1271 */
1272static int
1273nfs_readlink(struct vop_readlink_args *ap)
1274{
1275 struct vnode *vp = ap->a_vp;
1276
1277 if (vp->v_type != VLNK)
1278 return (EINVAL);
1279 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1280}
1281
1282/*
1283 * Do a readlink rpc.
1284 * Called by ncl_doio() from below the buffer cache.
1285 */
1286int
1287ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1288{
1289 int error, ret, attrflag;
1290 struct nfsvattr nfsva;
1291
1292 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1293 &attrflag, NULL);
1294 if (attrflag) {
1295 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1296 if (ret && !error)
1297 error = ret;
1298 }
1299 if (error && NFS_ISV4(vp))
1300 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1301 return (error);
1302}
1303
1304/*
1305 * nfs read rpc call
1306 * Ditto above
1307 */
1308int
1309ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1310{
1311 int error, ret, attrflag;
1312 struct nfsvattr nfsva;
1313
1314 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
1315 NULL);
1316 if (attrflag) {
1317 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1318 if (ret && !error)
1319 error = ret;
1320 }
1321 if (error && NFS_ISV4(vp))
1322 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1323 return (error);
1324}
1325
1326/*
1327 * nfs write call
1328 */
1329int
1330ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1331 int *iomode, int *must_commit, int called_from_strategy)
1332{
1333 struct nfsvattr nfsva;
1334 int error = 0, attrflag, ret;
1335
1336 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1337 uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
1338 if (attrflag) {
1339 if (VTONFS(vp)->n_flag & ND_NFSV4)
1340 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1341 1);
1342 else
1343 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1344 1);
1345 if (ret && !error)
1346 error = ret;
1347 }
1348 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC)
1349 *iomode = NFSWRITE_FILESYNC;
1350 if (error && NFS_ISV4(vp))
1351 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1352 return (error);
1353}
1354
1355/*
1356 * nfs mknod rpc
1357 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1358 * mode set to specify the file type and the size field for rdev.
1359 */
1360static int
1361nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1362 struct vattr *vap)
1363{
1364 struct nfsvattr nfsva, dnfsva;
1365 struct vnode *newvp = NULL;
1366 struct nfsnode *np = NULL, *dnp;
1367 struct nfsfh *nfhp;
1368 struct vattr vattr;
1369 int error = 0, attrflag, dattrflag;
1370 u_int32_t rdev;
1371
1372 if (vap->va_type == VCHR || vap->va_type == VBLK)
1373 rdev = vap->va_rdev;
1374 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1375 rdev = 0xffffffff;
1376 else
1377 return (EOPNOTSUPP);
1378 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1379 return (error);
1380 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1381 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1382 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1383 if (!error) {
1384 if (!nfhp)
1385 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1386 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1387 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1388 NULL);
1389 if (nfhp)
1390 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1391 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1392 }
1393 if (dattrflag)
1394 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1395 if (!error) {
1396 newvp = NFSTOV(np);
1397 if (attrflag != 0) {
1398 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1399 0, 1);
1400 if (error != 0)
1401 vput(newvp);
1402 }
1403 }
1404 if (!error) {
1405 if ((cnp->cn_flags & MAKEENTRY))
1406 cache_enter(dvp, newvp, cnp);
1407 *vpp = newvp;
1408 } else if (NFS_ISV4(dvp)) {
1409 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1410 vap->va_gid);
1411 }
1412 dnp = VTONFS(dvp);
1413 mtx_lock(&dnp->n_mtx);
1414 dnp->n_flag |= NMODIFIED;
1415 if (!dattrflag)
1416 dnp->n_attrstamp = 0;
1417 mtx_unlock(&dnp->n_mtx);
1418 return (error);
1419}
1420
1421/*
1422 * nfs mknod vop
1423 * just call nfs_mknodrpc() to do the work.
1424 */
1425/* ARGSUSED */
1426static int
1427nfs_mknod(struct vop_mknod_args *ap)
1428{
1429 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1430}
1431
1432static struct mtx nfs_cverf_mtx;
1433MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1434 MTX_DEF);
1435
1436static nfsquad_t
1437nfs_get_cverf(void)
1438{
1439 static nfsquad_t cverf;
1440 nfsquad_t ret;
1441 static int cverf_initialized = 0;
1442
1443 mtx_lock(&nfs_cverf_mtx);
1444 if (cverf_initialized == 0) {
1445 cverf.lval[0] = arc4random();
1446 cverf.lval[1] = arc4random();
1447 cverf_initialized = 1;
1448 } else
1449 cverf.qval++;
1450 ret = cverf;
1451 mtx_unlock(&nfs_cverf_mtx);
1452
1453 return (ret);
1454}
1455
1456/*
1457 * nfs file create call
1458 */
1459static int
1460nfs_create(struct vop_create_args *ap)
1461{
1462 struct vnode *dvp = ap->a_dvp;
1463 struct vattr *vap = ap->a_vap;
1464 struct componentname *cnp = ap->a_cnp;
1465 struct nfsnode *np = NULL, *dnp;
1466 struct vnode *newvp = NULL;
1467 struct nfsmount *nmp;
1468 struct nfsvattr dnfsva, nfsva;
1469 struct nfsfh *nfhp;
1470 nfsquad_t cverf;
1471 int error = 0, attrflag, dattrflag, fmode = 0;
1472 struct vattr vattr;
1473
1474 /*
1475 * Oops, not for me..
1476 */
1477 if (vap->va_type == VSOCK)
1478 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1479
1480 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1481 return (error);
1482 if (vap->va_vaflags & VA_EXCLUSIVE)
1483 fmode |= O_EXCL;
1484 dnp = VTONFS(dvp);
1485 nmp = VFSTONFS(vnode_mount(dvp));
1486again:
1487 /* For NFSv4, wait until any remove is done. */
1488 mtx_lock(&dnp->n_mtx);
1489 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1490 dnp->n_flag |= NREMOVEWANT;
1491 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1492 }
1493 mtx_unlock(&dnp->n_mtx);
1494
1495 cverf = nfs_get_cverf();
1496 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1497 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1498 &nfhp, &attrflag, &dattrflag, NULL);
1499 if (!error) {
1500 if (nfhp == NULL)
1501 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1502 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1503 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1504 NULL);
1505 if (nfhp != NULL)
1506 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1507 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1508 }
1509 if (dattrflag)
1510 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1511 if (!error) {
1512 newvp = NFSTOV(np);
1513 if (attrflag)
1514 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1515 0, 1);
1516 }
1517 if (error) {
1518 if (newvp != NULL) {
1519 vput(newvp);
1520 newvp = NULL;
1521 }
1522 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1523 error == NFSERR_NOTSUPP) {
1524 fmode &= ~O_EXCL;
1525 goto again;
1526 }
1527 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1528 if (nfscl_checksattr(vap, &nfsva)) {
1529 /*
1530 * We are normally called with only a partially
1531 * initialized VAP. Since the NFSv3 spec says that
1532 * the server may use the file attributes to
1533 * store the verifier, the spec requires us to do a
1534 * SETATTR RPC. FreeBSD servers store the verifier in
1535 * atime, but we can't really assume that all servers
1536 * will so we ensure that our SETATTR sets both atime
1537 * and mtime.
1538 */
1539 if (vap->va_mtime.tv_sec == VNOVAL)
1540 vfs_timestamp(&vap->va_mtime);
1541 if (vap->va_atime.tv_sec == VNOVAL)
1542 vap->va_atime = vap->va_mtime;
1543 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1544 cnp->cn_thread, &nfsva, &attrflag, NULL);
1545 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1546 vap->va_gid != (gid_t)VNOVAL)) {
1547 /* try again without setting uid/gid */
1548 vap->va_uid = (uid_t)VNOVAL;
1549 vap->va_gid = (uid_t)VNOVAL;
1550 error = nfsrpc_setattr(newvp, vap, NULL,
1551 cnp->cn_cred, cnp->cn_thread, &nfsva,
1552 &attrflag, NULL);
1553 }
1554 if (attrflag)
1555 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1556 NULL, 0, 1);
1557 }
1558 }
1559 if (!error) {
1560 if (cnp->cn_flags & MAKEENTRY)
1561 cache_enter(dvp, newvp, cnp);
1562 *ap->a_vpp = newvp;
1563 } else if (NFS_ISV4(dvp)) {
1564 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1565 vap->va_gid);
1566 }
1567 mtx_lock(&dnp->n_mtx);
1568 dnp->n_flag |= NMODIFIED;
1569 if (!dattrflag)
1570 dnp->n_attrstamp = 0;
1571 mtx_unlock(&dnp->n_mtx);
1572 return (error);
1573}
1574
1575/*
1576 * nfs file remove call
1577 * To try and make nfs semantics closer to ufs semantics, a file that has
1578 * other processes using the vnode is renamed instead of removed and then
1579 * removed later on the last close.
1580 * - If v_usecount > 1
1581 * If a rename is not already in the works
1582 * call nfs_sillyrename() to set it up
1583 * else
1584 * do the remove rpc
1585 */
1586static int
1587nfs_remove(struct vop_remove_args *ap)
1588{
1589 struct vnode *vp = ap->a_vp;
1590 struct vnode *dvp = ap->a_dvp;
1591 struct componentname *cnp = ap->a_cnp;
1592 struct nfsnode *np = VTONFS(vp);
1593 int error = 0;
1594 struct vattr vattr;
1595
1596 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1597 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1598 if (vp->v_type == VDIR)
1599 error = EPERM;
1600 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1601 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1602 vattr.va_nlink > 1)) {
1603 /*
1604 * Purge the name cache so that the chance of a lookup for
1605 * the name succeeding while the remove is in progress is
1606 * minimized. Without node locking it can still happen, such
1607 * that an I/O op returns ESTALE, but since you get this if
1608 * another host removes the file..
1609 */
1610 cache_purge(vp);
1611 /*
1612 * throw away biocache buffers, mainly to avoid
1613 * unnecessary delayed writes later.
1614 */
1615 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1616 /* Do the rpc */
1617 if (error != EINTR && error != EIO)
1618 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1619 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1620 /*
1621 * Kludge City: If the first reply to the remove rpc is lost..
1622 * the reply to the retransmitted request will be ENOENT
1623 * since the file was in fact removed
1624 * Therefore, we cheat and return success.
1625 */
1626 if (error == ENOENT)
1627 error = 0;
1628 } else if (!np->n_sillyrename)
1629 error = nfs_sillyrename(dvp, vp, cnp);
1630 mtx_lock(&np->n_mtx);
1631 np->n_attrstamp = 0;
1632 mtx_unlock(&np->n_mtx);
1633 return (error);
1634}
1635
1636/*
1637 * nfs file remove rpc called from nfs_inactive
1638 */
1639int
1640ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1641{
1642 /*
1643 * Make sure that the directory vnode is still valid.
1644 * XXX we should lock sp->s_dvp here.
1645 */
1646 if (sp->s_dvp->v_type == VBAD)
1647 return (0);
1648 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1649 sp->s_cred, NULL));
1650}
1651
1652/*
1653 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1654 */
1655static int
1656nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1657 int namelen, struct ucred *cred, struct thread *td)
1658{
1659 struct nfsvattr dnfsva;
1660 struct nfsnode *dnp = VTONFS(dvp);
1661 int error = 0, dattrflag;
1662
1663 mtx_lock(&dnp->n_mtx);
1664 dnp->n_flag |= NREMOVEINPROG;
1665 mtx_unlock(&dnp->n_mtx);
1666 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1667 &dattrflag, NULL);
1668 mtx_lock(&dnp->n_mtx);
1669 if ((dnp->n_flag & NREMOVEWANT)) {
1670 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1671 mtx_unlock(&dnp->n_mtx);
1672 wakeup((caddr_t)dnp);
1673 } else {
1674 dnp->n_flag &= ~NREMOVEINPROG;
1675 mtx_unlock(&dnp->n_mtx);
1676 }
1677 if (dattrflag)
1678 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1679 mtx_lock(&dnp->n_mtx);
1680 dnp->n_flag |= NMODIFIED;
1681 if (!dattrflag)
1682 dnp->n_attrstamp = 0;
1683 mtx_unlock(&dnp->n_mtx);
1684 if (error && NFS_ISV4(dvp))
1685 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1686 return (error);
1687}
1688
1689/*
1690 * nfs file rename call
1691 */
1692static int
1693nfs_rename(struct vop_rename_args *ap)
1694{
1695 struct vnode *fvp = ap->a_fvp;
1696 struct vnode *tvp = ap->a_tvp;
1697 struct vnode *fdvp = ap->a_fdvp;
1698 struct vnode *tdvp = ap->a_tdvp;
1699 struct componentname *tcnp = ap->a_tcnp;
1700 struct componentname *fcnp = ap->a_fcnp;
1701 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1702 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1703 struct nfsv4node *newv4 = NULL;
1704 int error;
1705
1706 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1707 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1708 /* Check for cross-device rename */
1709 if ((fvp->v_mount != tdvp->v_mount) ||
1710 (tvp && (fvp->v_mount != tvp->v_mount))) {
1711 error = EXDEV;
1712 goto out;
1713 }
1714
1715 if (fvp == tvp) {
1716 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
1717 error = 0;
1718 goto out;
1719 }
1720 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
1721 goto out;
1722
1723 /*
1724 * We have to flush B_DELWRI data prior to renaming
1725 * the file. If we don't, the delayed-write buffers
1726 * can be flushed out later after the file has gone stale
1727 * under NFSV3. NFSV2 does not have this problem because
1728 * ( as far as I can tell ) it flushes dirty buffers more
1729 * often.
1730 *
1731 * Skip the rename operation if the fsync fails, this can happen
1732 * due to the server's volume being full, when we pushed out data
1733 * that was written back to our cache earlier. Not checking for
1734 * this condition can result in potential (silent) data loss.
1735 */
1736 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1737 VOP_UNLOCK(fvp, 0);
1738 if (!error && tvp)
1739 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1740 if (error)
1741 goto out;
1742
1743 /*
1744 * If the tvp exists and is in use, sillyrename it before doing the
1745 * rename of the new file over it.
1746 * XXX Can't sillyrename a directory.
1747 */
1748 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1749 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1750 vput(tvp);
1751 tvp = NULL;
1752 }
1753
1754 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1755 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1756 tcnp->cn_thread);
1757
1758 if (error == 0 && NFS_ISV4(tdvp)) {
1759 /*
1760 * For NFSv4, check to see if it is the same name and
1761 * replace the name, if it is different.
1762 */
1763 MALLOC(newv4, struct nfsv4node *,
1764 sizeof (struct nfsv4node) +
1765 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1766 M_NFSV4NODE, M_WAITOK);
1767 mtx_lock(&tdnp->n_mtx);
1768 mtx_lock(&fnp->n_mtx);
1769 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1770 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1771 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1772 tcnp->cn_namelen) ||
1773 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1774 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1775 tdnp->n_fhp->nfh_len))) {
1776#ifdef notdef
1777{ char nnn[100]; int nnnl;
1778nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1779bcopy(tcnp->cn_nameptr, nnn, nnnl);
1780nnn[nnnl] = '\0';
1781printf("ren replace=%s\n",nnn);
1782}
1783#endif
1784 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
1785 fnp->n_v4 = newv4;
1786 newv4 = NULL;
1787 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1788 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1789 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1790 tdnp->n_fhp->nfh_len);
1791 NFSBCOPY(tcnp->cn_nameptr,
1792 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1793 }
1794 mtx_unlock(&tdnp->n_mtx);
1795 mtx_unlock(&fnp->n_mtx);
1796 if (newv4 != NULL)
1797 FREE((caddr_t)newv4, M_NFSV4NODE);
1798 }
1799
1800 if (fvp->v_type == VDIR) {
1801 if (tvp != NULL && tvp->v_type == VDIR)
1802 cache_purge(tdvp);
1803 cache_purge(fdvp);
1804 }
1805
1806out:
1807 if (tdvp == tvp)
1808 vrele(tdvp);
1809 else
1810 vput(tdvp);
1811 if (tvp)
1812 vput(tvp);
1813 vrele(fdvp);
1814 vrele(fvp);
1815 /*
1816 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1817 */
1818 if (error == ENOENT)
1819 error = 0;
1820 return (error);
1821}
1822
1823/*
1824 * nfs file rename rpc called from nfs_remove() above
1825 */
1826static int
1827nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
1828 struct sillyrename *sp)
1829{
1830
1831 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
1832 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
1833 scnp->cn_thread));
1834}
1835
1836/*
1837 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1838 */
1839static int
1840nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
1841 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
1842 int tnamelen, struct ucred *cred, struct thread *td)
1843{
1844 struct nfsvattr fnfsva, tnfsva;
1845 struct nfsnode *fdnp = VTONFS(fdvp);
1846 struct nfsnode *tdnp = VTONFS(tdvp);
1847 int error = 0, fattrflag, tattrflag;
1848
1849 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
1850 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
1851 &tattrflag, NULL, NULL);
1852 mtx_lock(&fdnp->n_mtx);
1853 fdnp->n_flag |= NMODIFIED;
1854 if (fattrflag != 0) {
1855 mtx_unlock(&fdnp->n_mtx);
1856 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
1857 } else {
1858 fdnp->n_attrstamp = 0;
1859 mtx_unlock(&fdnp->n_mtx);
1860 }
1861 mtx_lock(&tdnp->n_mtx);
1862 tdnp->n_flag |= NMODIFIED;
1863 if (tattrflag != 0) {
1864 mtx_unlock(&tdnp->n_mtx);
1865 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
1866 } else {
1867 tdnp->n_attrstamp = 0;
1868 mtx_unlock(&tdnp->n_mtx);
1869 }
1870 if (error && NFS_ISV4(fdvp))
1871 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1872 return (error);
1873}
1874
1875/*
1876 * nfs hard link create call
1877 */
1878static int
1879nfs_link(struct vop_link_args *ap)
1880{
1881 struct vnode *vp = ap->a_vp;
1882 struct vnode *tdvp = ap->a_tdvp;
1883 struct componentname *cnp = ap->a_cnp;
1884 struct nfsnode *np, *tdnp;
1885 struct nfsvattr nfsva, dnfsva;
1886 int error = 0, attrflag, dattrflag;
1887
1888 if (vp->v_mount != tdvp->v_mount) {
1889 return (EXDEV);
1890 }
1891
1892 /*
1893 * Push all writes to the server, so that the attribute cache
1894 * doesn't get "out of sync" with the server.
1895 * XXX There should be a better way!
1896 */
1897 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1898
1899 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
1900 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
1901 &dattrflag, NULL);
1902 tdnp = VTONFS(tdvp);
1903 mtx_lock(&tdnp->n_mtx);
1904 tdnp->n_flag |= NMODIFIED;
1905 if (dattrflag != 0) {
1906 mtx_unlock(&tdnp->n_mtx);
1907 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
1908 } else {
1909 tdnp->n_attrstamp = 0;
1910 mtx_unlock(&tdnp->n_mtx);
1911 }
1912 if (attrflag)
1913 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1914 else {
1915 np = VTONFS(vp);
1916 mtx_lock(&np->n_mtx);
1917 np->n_attrstamp = 0;
1918 mtx_unlock(&np->n_mtx);
1919 }
1920 /*
1921 * If negative lookup caching is enabled, I might as well
1922 * add an entry for this node. Not necessary for correctness,
1923 * but if negative caching is enabled, then the system
1924 * must care about lookup caching hit rate, so...
1925 */
1926 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
1927 (cnp->cn_flags & MAKEENTRY))
1928 cache_enter(tdvp, vp, cnp);
1929 if (error && NFS_ISV4(vp))
1930 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
1931 (gid_t)0);
1932 return (error);
1933}
1934
1935/*
1936 * nfs symbolic link create call
1937 */
1938static int
1939nfs_symlink(struct vop_symlink_args *ap)
1940{
1941 struct vnode *dvp = ap->a_dvp;
1942 struct vattr *vap = ap->a_vap;
1943 struct componentname *cnp = ap->a_cnp;
1944 struct nfsvattr nfsva, dnfsva;
1945 struct nfsfh *nfhp;
1946 struct nfsnode *np = NULL, *dnp;
1947 struct vnode *newvp = NULL;
1948 int error = 0, attrflag, dattrflag, ret;
1949
1950 vap->va_type = VLNK;
1951 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1952 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1953 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1954 if (nfhp) {
1955 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
1956 &np, NULL, LK_EXCLUSIVE);
1957 if (!ret)
1958 newvp = NFSTOV(np);
1959 else if (!error)
1960 error = ret;
1961 }
1962 if (newvp != NULL) {
1963 if (attrflag)
1964 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1965 0, 1);
1966 } else if (!error) {
1967 /*
1968 * If we do not have an error and we could not extract the
1969 * newvp from the response due to the request being NFSv2, we
1970 * have to do a lookup in order to obtain a newvp to return.
1971 */
1972 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1973 cnp->cn_cred, cnp->cn_thread, &np);
1974 if (!error)
1975 newvp = NFSTOV(np);
1976 }
1977 if (error) {
1978 if (newvp)
1979 vput(newvp);
1980 if (NFS_ISV4(dvp))
1981 error = nfscl_maperr(cnp->cn_thread, error,
1982 vap->va_uid, vap->va_gid);
1983 } else {
1984 /*
1985 * If negative lookup caching is enabled, I might as well
1986 * add an entry for this node. Not necessary for correctness,
1987 * but if negative caching is enabled, then the system
1988 * must care about lookup caching hit rate, so...
1989 */
1990 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
1991 (cnp->cn_flags & MAKEENTRY))
1992 cache_enter(dvp, newvp, cnp);
1993 *ap->a_vpp = newvp;
1994 }
1995
1996 dnp = VTONFS(dvp);
1997 mtx_lock(&dnp->n_mtx);
1998 dnp->n_flag |= NMODIFIED;
1999 if (dattrflag != 0) {
2000 mtx_unlock(&dnp->n_mtx);
2001 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2002 } else {
2003 dnp->n_attrstamp = 0;
2004 mtx_unlock(&dnp->n_mtx);
2005 }
2006 return (error);
2007}
2008
2009/*
2010 * nfs make dir call
2011 */
2012static int
2013nfs_mkdir(struct vop_mkdir_args *ap)
2014{
2015 struct vnode *dvp = ap->a_dvp;
2016 struct vattr *vap = ap->a_vap;
2017 struct componentname *cnp = ap->a_cnp;
2018 struct nfsnode *np = NULL, *dnp;
2019 struct vnode *newvp = NULL;
2020 struct vattr vattr;
2021 struct nfsfh *nfhp;
2022 struct nfsvattr nfsva, dnfsva;
2023 int error = 0, attrflag, dattrflag, ret;
2024
2025 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2026 return (error);
2027 vap->va_type = VDIR;
2028 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2029 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2030 &attrflag, &dattrflag, NULL);
2031 dnp = VTONFS(dvp);
2032 mtx_lock(&dnp->n_mtx);
2033 dnp->n_flag |= NMODIFIED;
2034 if (dattrflag != 0) {
2035 mtx_unlock(&dnp->n_mtx);
2036 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2037 } else {
2038 dnp->n_attrstamp = 0;
2039 mtx_unlock(&dnp->n_mtx);
2040 }
2041 if (nfhp) {
2042 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2043 &np, NULL, LK_EXCLUSIVE);
2044 if (!ret) {
2045 newvp = NFSTOV(np);
2046 if (attrflag)
2047 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2048 NULL, 0, 1);
2049 } else if (!error)
2050 error = ret;
2051 }
2052 if (!error && newvp == NULL) {
2053 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2054 cnp->cn_cred, cnp->cn_thread, &np);
2055 if (!error) {
2056 newvp = NFSTOV(np);
2057 if (newvp->v_type != VDIR)
2058 error = EEXIST;
2059 }
2060 }
2061 if (error) {
2062 if (newvp)
2063 vput(newvp);
2064 if (NFS_ISV4(dvp))
2065 error = nfscl_maperr(cnp->cn_thread, error,
2066 vap->va_uid, vap->va_gid);
2067 } else {
2068 /*
2069 * If negative lookup caching is enabled, I might as well
2070 * add an entry for this node. Not necessary for correctness,
2071 * but if negative caching is enabled, then the system
2072 * must care about lookup caching hit rate, so...
2073 */
2074 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2075 (cnp->cn_flags & MAKEENTRY))
2076 cache_enter(dvp, newvp, cnp);
2077 *ap->a_vpp = newvp;
2078 }
2079 return (error);
2080}
2081
2082/*
2083 * nfs remove directory call
2084 */
2085static int
2086nfs_rmdir(struct vop_rmdir_args *ap)
2087{
2088 struct vnode *vp = ap->a_vp;
2089 struct vnode *dvp = ap->a_dvp;
2090 struct componentname *cnp = ap->a_cnp;
2091 struct nfsnode *dnp;
2092 struct nfsvattr dnfsva;
2093 int error, dattrflag;
2094
2095 if (dvp == vp)
2096 return (EINVAL);
2097 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2098 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2099 dnp = VTONFS(dvp);
2100 mtx_lock(&dnp->n_mtx);
2101 dnp->n_flag |= NMODIFIED;
2102 if (dattrflag != 0) {
2103 mtx_unlock(&dnp->n_mtx);
2104 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2105 } else {
2106 dnp->n_attrstamp = 0;
2107 mtx_unlock(&dnp->n_mtx);
2108 }
2109
2110 cache_purge(dvp);
2111 cache_purge(vp);
2112 if (error && NFS_ISV4(dvp))
2113 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2114 (gid_t)0);
2115 /*
2116 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2117 */
2118 if (error == ENOENT)
2119 error = 0;
2120 return (error);
2121}
2122
2123/*
2124 * nfs readdir call
2125 */
2126static int
2127nfs_readdir(struct vop_readdir_args *ap)
2128{
2129 struct vnode *vp = ap->a_vp;
2130 struct nfsnode *np = VTONFS(vp);
2131 struct uio *uio = ap->a_uio;
2132 int tresid, error = 0;
2133 struct vattr vattr;
2134
2135 if (vp->v_type != VDIR)
2136 return(EPERM);
2137
2138 /*
2139 * First, check for hit on the EOF offset cache
2140 */
2141 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2142 (np->n_flag & NMODIFIED) == 0) {
2143 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2144 mtx_lock(&np->n_mtx);
2145 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2146 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2147 mtx_unlock(&np->n_mtx);
2148 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
2149 return (0);
2150 } else
2151 mtx_unlock(&np->n_mtx);
2152 }
2153 }
2154
2155 /*
2156 * Call ncl_bioread() to do the real work.
2157 */
2158 tresid = uio->uio_resid;
2159 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2160
2161 if (!error && uio->uio_resid == tresid)
2162 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
2163 return (error);
2164}
2165
2166/*
2167 * Readdir rpc call.
2168 * Called from below the buffer cache by ncl_doio().
2169 */
2170int
2171ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2172 struct thread *td)
2173{
2174 struct nfsvattr nfsva;
2175 nfsuint64 *cookiep, cookie;
2176 struct nfsnode *dnp = VTONFS(vp);
2177 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2178 int error = 0, eof, attrflag;
2179
2180 KASSERT(uiop->uio_iovcnt == 1 &&
2181 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2182 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2183 ("nfs readdirrpc bad uio"));
2184
2185 /*
2186 * If there is no cookie, assume directory was stale.
2187 */
2188 ncl_dircookie_lock(dnp);
2189 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2190 if (cookiep) {
2191 cookie = *cookiep;
2192 ncl_dircookie_unlock(dnp);
2193 } else {
2194 ncl_dircookie_unlock(dnp);
2195 return (NFSERR_BAD_COOKIE);
2196 }
2197
2198 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2199 (void)ncl_fsinfo(nmp, vp, cred, td);
2200
2201 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2202 &attrflag, &eof, NULL);
2203 if (attrflag)
2204 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2205
2206 if (!error) {
2207 /*
2208 * We are now either at the end of the directory or have filled
2209 * the block.
2210 */
2211 if (eof)
2212 dnp->n_direofoffset = uiop->uio_offset;
2213 else {
2214 if (uiop->uio_resid > 0)
2215 ncl_printf("EEK! readdirrpc resid > 0\n");
2216 ncl_dircookie_lock(dnp);
2217 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2218 *cookiep = cookie;
2219 ncl_dircookie_unlock(dnp);
2220 }
2221 } else if (NFS_ISV4(vp)) {
2222 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2223 }
2224 return (error);
2225}
2226
2227/*
2228 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2229 */
2230int
2231ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2232 struct thread *td)
2233{
2234 struct nfsvattr nfsva;
2235 nfsuint64 *cookiep, cookie;
2236 struct nfsnode *dnp = VTONFS(vp);
2237 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2238 int error = 0, attrflag, eof;
2239
2240 KASSERT(uiop->uio_iovcnt == 1 &&
2241 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2242 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2243 ("nfs readdirplusrpc bad uio"));
2244
2245 /*
2246 * If there is no cookie, assume directory was stale.
2247 */
2248 ncl_dircookie_lock(dnp);
2249 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2250 if (cookiep) {
2251 cookie = *cookiep;
2252 ncl_dircookie_unlock(dnp);
2253 } else {
2254 ncl_dircookie_unlock(dnp);
2255 return (NFSERR_BAD_COOKIE);
2256 }
2257
2258 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2259 (void)ncl_fsinfo(nmp, vp, cred, td);
2260 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2261 &attrflag, &eof, NULL);
2262 if (attrflag)
2263 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2264
2265 if (!error) {
2266 /*
2267 * We are now either at end of the directory or have filled the
2268 * the block.
2269 */
2270 if (eof)
2271 dnp->n_direofoffset = uiop->uio_offset;
2272 else {
2273 if (uiop->uio_resid > 0)
2274 ncl_printf("EEK! readdirplusrpc resid > 0\n");
2275 ncl_dircookie_lock(dnp);
2276 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2277 *cookiep = cookie;
2278 ncl_dircookie_unlock(dnp);
2279 }
2280 } else if (NFS_ISV4(vp)) {
2281 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2282 }
2283 return (error);
2284}
2285
2286/*
2287 * Silly rename. To make the NFS filesystem that is stateless look a little
2288 * more like the "ufs" a remove of an active vnode is translated to a rename
2289 * to a funny looking filename that is removed by nfs_inactive on the
2290 * nfsnode. There is the potential for another process on a different client
2291 * to create the same funny name between the nfs_lookitup() fails and the
2292 * nfs_rename() completes, but...
2293 */
2294static int
2295nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2296{
2297 struct sillyrename *sp;
2298 struct nfsnode *np;
2299 int error;
2300 short pid;
2301 unsigned int lticks;
2302
2303 cache_purge(dvp);
2304 np = VTONFS(vp);
2305 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2306 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2307 M_NEWNFSREQ, M_WAITOK);
2308 sp->s_cred = crhold(cnp->cn_cred);
2309 sp->s_dvp = dvp;
2310 VREF(dvp);
2311
2312 /*
2313 * Fudge together a funny name.
2314 * Changing the format of the funny name to accomodate more
2315 * sillynames per directory.
2316 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2317 * CPU ticks since boot.
2318 */
2319 pid = cnp->cn_thread->td_proc->p_pid;
2320 lticks = (unsigned int)ticks;
2321 for ( ; ; ) {
2322 sp->s_namlen = sprintf(sp->s_name,
2323 ".nfs.%08x.%04x4.4", lticks,
2324 pid);
2325 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2326 cnp->cn_thread, NULL))
2327 break;
2328 lticks++;
2329 }
2330 error = nfs_renameit(dvp, vp, cnp, sp);
2331 if (error)
2332 goto bad;
2333 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2334 cnp->cn_thread, &np);
2335 np->n_sillyrename = sp;
2336 return (0);
2337bad:
2338 vrele(sp->s_dvp);
2339 crfree(sp->s_cred);
2340 free((caddr_t)sp, M_NEWNFSREQ);
2341 return (error);
2342}
2343
2344/*
2345 * Look up a file name and optionally either update the file handle or
2346 * allocate an nfsnode, depending on the value of npp.
2347 * npp == NULL --> just do the lookup
2348 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2349 * handled too
2350 * *npp != NULL --> update the file handle in the vnode
2351 */
2352static int
2353nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2354 struct thread *td, struct nfsnode **npp)
2355{
2356 struct vnode *newvp = NULL, *vp;
2357 struct nfsnode *np, *dnp = VTONFS(dvp);
2358 struct nfsfh *nfhp, *onfhp;
2359 struct nfsvattr nfsva, dnfsva;
2360 struct componentname cn;
2361 int error = 0, attrflag, dattrflag;
2362 u_int hash;
2363
2364 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2365 &nfhp, &attrflag, &dattrflag, NULL);
2366 if (dattrflag)
2367 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2368 if (npp && !error) {
2369 if (*npp != NULL) {
2370 np = *npp;
2371 vp = NFSTOV(np);
2372 /*
2373 * For NFSv4, check to see if it is the same name and
2374 * replace the name, if it is different.
2375 */
2376 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2377 (np->n_v4->n4_namelen != len ||
2378 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2379 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2380 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2381 dnp->n_fhp->nfh_len))) {
2382#ifdef notdef
2383{ char nnn[100]; int nnnl;
2384nnnl = (len < 100) ? len : 99;
2385bcopy(name, nnn, nnnl);
2386nnn[nnnl] = '\0';
2387printf("replace=%s\n",nnn);
2388}
2389#endif
2390 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
2391 MALLOC(np->n_v4, struct nfsv4node *,
2392 sizeof (struct nfsv4node) +
2393 dnp->n_fhp->nfh_len + len - 1,
2394 M_NFSV4NODE, M_WAITOK);
2395 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2396 np->n_v4->n4_namelen = len;
2397 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2398 dnp->n_fhp->nfh_len);
2399 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2400 }
2401 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2402 FNV1_32_INIT);
2403 onfhp = np->n_fhp;
2404 /*
2405 * Rehash node for new file handle.
2406 */
2407 vfs_hash_rehash(vp, hash);
2408 np->n_fhp = nfhp;
2409 if (onfhp != NULL)
2410 FREE((caddr_t)onfhp, M_NFSFH);
2411 newvp = NFSTOV(np);
2412 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2413 FREE((caddr_t)nfhp, M_NFSFH);
2414 VREF(dvp);
2415 newvp = dvp;
2416 } else {
2417 cn.cn_nameptr = name;
2418 cn.cn_namelen = len;
2419 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2420 &np, NULL, LK_EXCLUSIVE);
2421 if (error)
2422 return (error);
2423 newvp = NFSTOV(np);
2424 }
2425 if (!attrflag && *npp == NULL) {
2426 if (newvp == dvp)
2427 vrele(newvp);
2428 else
2429 vput(newvp);
2430 return (ENOENT);
2431 }
2432 if (attrflag)
2433 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2434 0, 1);
2435 }
2436 if (npp && *npp == NULL) {
2437 if (error) {
2438 if (newvp) {
2439 if (newvp == dvp)
2440 vrele(newvp);
2441 else
2442 vput(newvp);
2443 }
2444 } else
2445 *npp = np;
2446 }
2447 if (error && NFS_ISV4(dvp))
2448 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2449 return (error);
2450}
2451
2452/*
2453 * Nfs Version 3 and 4 commit rpc
2454 */
2455int
2456ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2457 struct thread *td)
2458{
2459 struct nfsvattr nfsva;
2460 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2461 int error, attrflag;
2462 u_char verf[NFSX_VERF];
2463
2464 mtx_lock(&nmp->nm_mtx);
2465 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2466 mtx_unlock(&nmp->nm_mtx);
2467 return (0);
2468 }
2469 mtx_unlock(&nmp->nm_mtx);
2470 error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
2471 &attrflag, NULL);
2472 if (!error) {
2473 mtx_lock(&nmp->nm_mtx);
2474 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
2475 NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
2476 error = NFSERR_STALEWRITEVERF;
2477 }
2478 mtx_unlock(&nmp->nm_mtx);
2479 if (!error && attrflag)
2480 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2481 0, 1);
2482 } else if (NFS_ISV4(vp)) {
2483 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2484 }
2485 return (error);
2486}
2487
2488/*
2489 * Strategy routine.
2490 * For async requests when nfsiod(s) are running, queue the request by
2491 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2492 * request.
2493 */
2494static int
2495nfs_strategy(struct vop_strategy_args *ap)
2496{
2497 struct buf *bp = ap->a_bp;
2498 struct ucred *cr;
2499
2500 KASSERT(!(bp->b_flags & B_DONE),
2501 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2502 BUF_ASSERT_HELD(bp);
2503
2504 if (bp->b_iocmd == BIO_READ)
2505 cr = bp->b_rcred;
2506 else
2507 cr = bp->b_wcred;
2508
2509 /*
2510 * If the op is asynchronous and an i/o daemon is waiting
2511 * queue the request, wake it up and wait for completion
2512 * otherwise just do it ourselves.
2513 */
2514 if ((bp->b_flags & B_ASYNC) == 0 ||
2515 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2516 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
2517 return (0);
2518}
2519
2520/*
2521 * fsync vnode op. Just call ncl_flush() with commit == 1.
2522 */
2523/* ARGSUSED */
2524static int
2525nfs_fsync(struct vop_fsync_args *ap)
2526{
2527 return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
2528}
2529
2530/*
2531 * Flush all the blocks associated with a vnode.
2532 * Walk through the buffer pool and push any dirty pages
2533 * associated with the vnode.
2534 * If the called_from_renewthread argument is TRUE, it has been called
2535 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2536 * waiting for a buffer write to complete.
2537 */
2538int
2539ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
2540 int commit, int called_from_renewthread)
2541{
2542 struct nfsnode *np = VTONFS(vp);
2543 struct buf *bp;
2544 int i;
2545 struct buf *nbp;
2546 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2547 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2548 int passone = 1, trycnt = 0;
2549 u_quad_t off, endoff, toff;
2550 struct ucred* wcred = NULL;
2551 struct buf **bvec = NULL;
2552 struct bufobj *bo;
2553#ifndef NFS_COMMITBVECSIZ
2554#define NFS_COMMITBVECSIZ 20
2555#endif
2556 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2557 int bvecsize = 0, bveccount;
2558
2559 if (called_from_renewthread != 0)
2560 slptimeo = hz;
2561 if (nmp->nm_flag & NFSMNT_INT)
2562 slpflag = NFS_PCATCH;
2563 if (!commit)
2564 passone = 0;
2565 bo = &vp->v_bufobj;
2566 /*
2567 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2568 * server, but has not been committed to stable storage on the server
2569 * yet. On the first pass, the byte range is worked out and the commit
2570 * rpc is done. On the second pass, ncl_writebp() is called to do the
2571 * job.
2572 */
2573again:
2574 off = (u_quad_t)-1;
2575 endoff = 0;
2576 bvecpos = 0;
2577 if (NFS_ISV34(vp) && commit) {
2578 if (bvec != NULL && bvec != bvec_on_stack)
2579 free(bvec, M_TEMP);
2580 /*
2581 * Count up how many buffers waiting for a commit.
2582 */
2583 bveccount = 0;
2584 BO_LOCK(bo);
2585 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2586 if (!BUF_ISLOCKED(bp) &&
2587 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2588 == (B_DELWRI | B_NEEDCOMMIT))
2589 bveccount++;
2590 }
2591 /*
2592 * Allocate space to remember the list of bufs to commit. It is
2593 * important to use M_NOWAIT here to avoid a race with nfs_write.
2594 * If we can't get memory (for whatever reason), we will end up
2595 * committing the buffers one-by-one in the loop below.
2596 */
2597 if (bveccount > NFS_COMMITBVECSIZ) {
2598 /*
2599 * Release the vnode interlock to avoid a lock
2600 * order reversal.
2601 */
2602 BO_UNLOCK(bo);
2603 bvec = (struct buf **)
2604 malloc(bveccount * sizeof(struct buf *),
2605 M_TEMP, M_NOWAIT);
2606 BO_LOCK(bo);
2607 if (bvec == NULL) {
2608 bvec = bvec_on_stack;
2609 bvecsize = NFS_COMMITBVECSIZ;
2610 } else
2611 bvecsize = bveccount;
2612 } else {
2613 bvec = bvec_on_stack;
2614 bvecsize = NFS_COMMITBVECSIZ;
2615 }
2616 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2617 if (bvecpos >= bvecsize)
2618 break;
2619 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2620 nbp = TAILQ_NEXT(bp, b_bobufs);
2621 continue;
2622 }
2623 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2624 (B_DELWRI | B_NEEDCOMMIT)) {
2625 BUF_UNLOCK(bp);
2626 nbp = TAILQ_NEXT(bp, b_bobufs);
2627 continue;
2628 }
2629 BO_UNLOCK(bo);
2630 bremfree(bp);
2631 /*
2632 * Work out if all buffers are using the same cred
2633 * so we can deal with them all with one commit.
2634 *
2635 * NOTE: we are not clearing B_DONE here, so we have
2636 * to do it later on in this routine if we intend to
2637 * initiate I/O on the bp.
2638 *
2639 * Note: to avoid loopback deadlocks, we do not
2640 * assign b_runningbufspace.
2641 */
2642 if (wcred == NULL)
2643 wcred = bp->b_wcred;
2644 else if (wcred != bp->b_wcred)
2645 wcred = NOCRED;
2646 vfs_busy_pages(bp, 1);
2647
2648 BO_LOCK(bo);
2649 /*
2650 * bp is protected by being locked, but nbp is not
2651 * and vfs_busy_pages() may sleep. We have to
2652 * recalculate nbp.
2653 */
2654 nbp = TAILQ_NEXT(bp, b_bobufs);
2655
2656 /*
2657 * A list of these buffers is kept so that the
2658 * second loop knows which buffers have actually
2659 * been committed. This is necessary, since there
2660 * may be a race between the commit rpc and new
2661 * uncommitted writes on the file.
2662 */
2663 bvec[bvecpos++] = bp;
2664 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2665 bp->b_dirtyoff;
2666 if (toff < off)
2667 off = toff;
2668 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2669 if (toff > endoff)
2670 endoff = toff;
2671 }
2672 BO_UNLOCK(bo);
2673 }
2674 if (bvecpos > 0) {
2675 /*
2676 * Commit data on the server, as required.
2677 * If all bufs are using the same wcred, then use that with
2678 * one call for all of them, otherwise commit each one
2679 * separately.
2680 */
2681 if (wcred != NOCRED)
2682 retv = ncl_commit(vp, off, (int)(endoff - off),
2683 wcred, td);
2684 else {
2685 retv = 0;
2686 for (i = 0; i < bvecpos; i++) {
2687 off_t off, size;
2688 bp = bvec[i];
2689 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2690 bp->b_dirtyoff;
2691 size = (u_quad_t)(bp->b_dirtyend
2692 - bp->b_dirtyoff);
2693 retv = ncl_commit(vp, off, (int)size,
2694 bp->b_wcred, td);
2695 if (retv) break;
2696 }
2697 }
2698
2699 if (retv == NFSERR_STALEWRITEVERF)
2700 ncl_clearcommit(vp->v_mount);
2701
2702 /*
2703 * Now, either mark the blocks I/O done or mark the
2704 * blocks dirty, depending on whether the commit
2705 * succeeded.
2706 */
2707 for (i = 0; i < bvecpos; i++) {
2708 bp = bvec[i];
2709 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2710 if (retv) {
2711 /*
2712 * Error, leave B_DELWRI intact
2713 */
2714 vfs_unbusy_pages(bp);
2715 brelse(bp);
2716 } else {
2717 /*
2718 * Success, remove B_DELWRI ( bundirty() ).
2719 *
2720 * b_dirtyoff/b_dirtyend seem to be NFS
2721 * specific. We should probably move that
2722 * into bundirty(). XXX
2723 */
2724 bufobj_wref(bo);
2725 bp->b_flags |= B_ASYNC;
2726 bundirty(bp);
2727 bp->b_flags &= ~B_DONE;
2728 bp->b_ioflags &= ~BIO_ERROR;
2729 bp->b_dirtyoff = bp->b_dirtyend = 0;
2730 bufdone(bp);
2731 }
2732 }
2733 }
2734
2735 /*
2736 * Start/do any write(s) that are required.
2737 */
2738loop:
2739 BO_LOCK(bo);
2740 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2741 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2742 if (waitfor != MNT_WAIT || passone)
2743 continue;
2744
2745 error = BUF_TIMELOCK(bp,
2746 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2747 BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
2748 if (error == 0) {
2749 BUF_UNLOCK(bp);
2750 goto loop;
2751 }
2752 if (error == ENOLCK) {
2753 error = 0;
2754 goto loop;
2755 }
2756 if (called_from_renewthread != 0) {
2757 /*
2758 * Return EIO so the flush will be retried
2759 * later.
2760 */
2761 error = EIO;
2762 goto done;
2763 }
2764 if (newnfs_sigintr(nmp, td)) {
2765 error = EINTR;
2766 goto done;
2767 }
2768 if (slpflag & PCATCH) {
2769 slpflag = 0;
2770 slptimeo = 2 * hz;
2771 }
2772 goto loop;
2773 }
2774 if ((bp->b_flags & B_DELWRI) == 0)
2775 panic("nfs_fsync: not dirty");
2776 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2777 BUF_UNLOCK(bp);
2778 continue;
2779 }
2780 BO_UNLOCK(bo);
2781 bremfree(bp);
2782 if (passone || !commit)
2783 bp->b_flags |= B_ASYNC;
2784 else
2785 bp->b_flags |= B_ASYNC;
2786 bwrite(bp);
2787 if (newnfs_sigintr(nmp, td)) {
2788 error = EINTR;
2789 goto done;
2790 }
2791 goto loop;
2792 }
2793 if (passone) {
2794 passone = 0;
2795 BO_UNLOCK(bo);
2796 goto again;
2797 }
2798 if (waitfor == MNT_WAIT) {
2799 while (bo->bo_numoutput) {
2800 error = bufobj_wwait(bo, slpflag, slptimeo);
2801 if (error) {
2802 BO_UNLOCK(bo);
2803 if (called_from_renewthread != 0) {
2804 /*
2805 * Return EIO so that the flush will be
2806 * retried later.
2807 */
2808 error = EIO;
2809 goto done;
2810 }
2811 error = newnfs_sigintr(nmp, td);
2812 if (error)
2813 goto done;
2814 if (slpflag & PCATCH) {
2815 slpflag = 0;
2816 slptimeo = 2 * hz;
2817 }
2818 BO_LOCK(bo);
2819 }
2820 }
2821 if (bo->bo_dirty.bv_cnt != 0 && commit) {
2822 BO_UNLOCK(bo);
2823 goto loop;
2824 }
2825 /*
2826 * Wait for all the async IO requests to drain
2827 */
2828 BO_UNLOCK(bo);
2829 mtx_lock(&np->n_mtx);
2830 while (np->n_directio_asyncwr > 0) {
2831 np->n_flag |= NFSYNCWAIT;
2832 error = newnfs_msleep(td, &np->n_directio_asyncwr,
2833 &np->n_mtx, slpflag | (PRIBIO + 1),
2834 "nfsfsync", 0);
2835 if (error) {
2836 if (newnfs_sigintr(nmp, td)) {
2837 mtx_unlock(&np->n_mtx);
2838 error = EINTR;
2839 goto done;
2840 }
2841 }
2842 }
2843 mtx_unlock(&np->n_mtx);
2844 } else
2845 BO_UNLOCK(bo);
2846 mtx_lock(&np->n_mtx);
2847 if (np->n_flag & NWRITEERR) {
2848 error = np->n_error;
2849 np->n_flag &= ~NWRITEERR;
2850 }
2851 if (commit && bo->bo_dirty.bv_cnt == 0 &&
2852 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
2853 np->n_flag &= ~NMODIFIED;
2854 mtx_unlock(&np->n_mtx);
2855done:
2856 if (bvec != NULL && bvec != bvec_on_stack)
2857 free(bvec, M_TEMP);
2858 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
2859 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
2860 np->n_directio_asyncwr != 0) && trycnt++ < 5) {
2861 /* try, try again... */
2862 passone = 1;
2863 wcred = NULL;
2864 bvec = NULL;
2865 bvecsize = 0;
2866printf("try%d\n", trycnt);
2867 goto again;
2868 }
2869 return (error);
2870}
2871
2872/*
2873 * NFS advisory byte-level locks.
2874 */
2875static int
2876nfs_advlock(struct vop_advlock_args *ap)
2877{
2878 struct vnode *vp = ap->a_vp;
2879 struct ucred *cred;
2880 struct nfsnode *np = VTONFS(ap->a_vp);
2881 struct proc *p = (struct proc *)ap->a_id;
2882 struct thread *td = curthread; /* XXX */
2883 struct vattr va;
2884 int ret, error = EOPNOTSUPP;
2885 u_quad_t size;
2886
2887 if (NFS_ISV4(vp) && (ap->a_flags & F_POSIX)) {
2888 cred = p->p_ucred;
2889 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2890 if (vp->v_iflag & VI_DOOMED) {
2891 VOP_UNLOCK(vp, 0);
2892 return (EBADF);
2893 }
2894
2895 /*
2896 * If this is unlocking a write locked region, flush and
2897 * commit them before unlocking. This is required by
2898 * RFC3530 Sec. 9.3.2.
2899 */
2900 if (ap->a_op == F_UNLCK &&
| 37
38/*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42#include "opt_inet.h"
43
44#include <sys/param.h>
45#include <sys/kernel.h>
46#include <sys/systm.h>
47#include <sys/resourcevar.h>
48#include <sys/proc.h>
49#include <sys/mount.h>
50#include <sys/bio.h>
51#include <sys/buf.h>
52#include <sys/jail.h>
53#include <sys/malloc.h>
54#include <sys/mbuf.h>
55#include <sys/namei.h>
56#include <sys/socket.h>
57#include <sys/vnode.h>
58#include <sys/dirent.h>
59#include <sys/fcntl.h>
60#include <sys/lockf.h>
61#include <sys/stat.h>
62#include <sys/sysctl.h>
63#include <sys/signalvar.h>
64
65#include <vm/vm.h>
66#include <vm/vm_extern.h>
67#include <vm/vm_object.h>
68
69#include <fs/nfs/nfsport.h>
70#include <fs/nfsclient/nfsnode.h>
71#include <fs/nfsclient/nfsmount.h>
72#include <fs/nfsclient/nfs.h>
73
74#include <net/if.h>
75#include <netinet/in.h>
76#include <netinet/in_var.h>
77
78#include <nfs/nfs_lock.h>
79
80/* Defs */
81#define TRUE 1
82#define FALSE 0
83
84extern struct nfsstats newnfsstats;
85extern int nfsrv_useacl;
86MALLOC_DECLARE(M_NEWNFSREQ);
87
88/*
89 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
90 * calls are not in getblk() and brelse() so that they would not be necessary
91 * here.
92 */
93#ifndef B_VMIO
94#define vfs_busy_pages(bp, f)
95#endif
96
97static vop_read_t nfsfifo_read;
98static vop_write_t nfsfifo_write;
99static vop_close_t nfsfifo_close;
100static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
101 struct thread *);
102static vop_lookup_t nfs_lookup;
103static vop_create_t nfs_create;
104static vop_mknod_t nfs_mknod;
105static vop_open_t nfs_open;
106static vop_pathconf_t nfs_pathconf;
107static vop_close_t nfs_close;
108static vop_access_t nfs_access;
109static vop_getattr_t nfs_getattr;
110static vop_setattr_t nfs_setattr;
111static vop_read_t nfs_read;
112static vop_fsync_t nfs_fsync;
113static vop_remove_t nfs_remove;
114static vop_link_t nfs_link;
115static vop_rename_t nfs_rename;
116static vop_mkdir_t nfs_mkdir;
117static vop_rmdir_t nfs_rmdir;
118static vop_symlink_t nfs_symlink;
119static vop_readdir_t nfs_readdir;
120static vop_strategy_t nfs_strategy;
121static vop_lock1_t nfs_lock1;
122static int nfs_lookitup(struct vnode *, char *, int,
123 struct ucred *, struct thread *, struct nfsnode **);
124static int nfs_sillyrename(struct vnode *, struct vnode *,
125 struct componentname *);
126static vop_access_t nfsspec_access;
127static vop_readlink_t nfs_readlink;
128static vop_print_t nfs_print;
129static vop_advlock_t nfs_advlock;
130static vop_advlockasync_t nfs_advlockasync;
131static vop_getacl_t nfs_getacl;
132static vop_setacl_t nfs_setacl;
133
134/*
135 * Global vfs data structures for nfs
136 */
137struct vop_vector newnfs_vnodeops = {
138 .vop_default = &default_vnodeops,
139 .vop_access = nfs_access,
140 .vop_advlock = nfs_advlock,
141 .vop_advlockasync = nfs_advlockasync,
142 .vop_close = nfs_close,
143 .vop_create = nfs_create,
144 .vop_fsync = nfs_fsync,
145 .vop_getattr = nfs_getattr,
146 .vop_getpages = ncl_getpages,
147 .vop_putpages = ncl_putpages,
148 .vop_inactive = ncl_inactive,
149 .vop_link = nfs_link,
150 .vop_lock1 = nfs_lock1,
151 .vop_lookup = nfs_lookup,
152 .vop_mkdir = nfs_mkdir,
153 .vop_mknod = nfs_mknod,
154 .vop_open = nfs_open,
155 .vop_pathconf = nfs_pathconf,
156 .vop_print = nfs_print,
157 .vop_read = nfs_read,
158 .vop_readdir = nfs_readdir,
159 .vop_readlink = nfs_readlink,
160 .vop_reclaim = ncl_reclaim,
161 .vop_remove = nfs_remove,
162 .vop_rename = nfs_rename,
163 .vop_rmdir = nfs_rmdir,
164 .vop_setattr = nfs_setattr,
165 .vop_strategy = nfs_strategy,
166 .vop_symlink = nfs_symlink,
167 .vop_write = ncl_write,
168 .vop_getacl = nfs_getacl,
169 .vop_setacl = nfs_setacl,
170};
171
172struct vop_vector newnfs_fifoops = {
173 .vop_default = &fifo_specops,
174 .vop_access = nfsspec_access,
175 .vop_close = nfsfifo_close,
176 .vop_fsync = nfs_fsync,
177 .vop_getattr = nfs_getattr,
178 .vop_inactive = ncl_inactive,
179 .vop_print = nfs_print,
180 .vop_read = nfsfifo_read,
181 .vop_reclaim = ncl_reclaim,
182 .vop_setattr = nfs_setattr,
183 .vop_write = nfsfifo_write,
184};
185
186static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
187 struct componentname *cnp, struct vattr *vap);
188static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
189 int namelen, struct ucred *cred, struct thread *td);
190static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
191 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
192 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
193static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
194 struct componentname *scnp, struct sillyrename *sp);
195
196/*
197 * Global variables
198 */
199#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
200
201SYSCTL_DECL(_vfs_nfs);
202
203static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
204SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
205 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
206
207static int nfs_prime_access_cache = 0;
208SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
209 &nfs_prime_access_cache, 0,
210 "Prime NFS ACCESS cache when fetching attributes");
211
212static int newnfs_commit_on_close = 0;
213SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
214 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
215
216static int nfs_clean_pages_on_close = 1;
217SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
218 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
219
220int newnfs_directio_enable = 0;
221SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
222 &newnfs_directio_enable, 0, "Enable NFS directio");
223
224/*
225 * This sysctl allows other processes to mmap a file that has been opened
226 * O_DIRECT by a process. In general, having processes mmap the file while
227 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
228 * this by default to prevent DoS attacks - to prevent a malicious user from
229 * opening up files O_DIRECT preventing other users from mmap'ing these
230 * files. "Protected" environments where stricter consistency guarantees are
231 * required can disable this knob. The process that opened the file O_DIRECT
232 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
233 * meaningful.
234 */
235int newnfs_directio_allow_mmap = 1;
236SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
237 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
238
239#if 0
240SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
241 &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
242
243SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
244 &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
245#endif
246
247#define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
248 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
249 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
250
251/*
252 * SMP Locking Note :
253 * The list of locks after the description of the lock is the ordering
254 * of other locks acquired with the lock held.
255 * np->n_mtx : Protects the fields in the nfsnode.
256 VM Object Lock
257 VI_MTX (acquired indirectly)
258 * nmp->nm_mtx : Protects the fields in the nfsmount.
259 rep->r_mtx
260 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
261 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
262 nmp->nm_mtx
263 rep->r_mtx
264 * rep->r_mtx : Protects the fields in an nfsreq.
265 */
266
267static int
268nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
269 struct ucred *cred, u_int32_t *retmode)
270{
271 int error = 0, attrflag, i, lrupos;
272 u_int32_t rmode;
273 struct nfsnode *np = VTONFS(vp);
274 struct nfsvattr nfsva;
275
276 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
277 &rmode, NULL);
278 if (attrflag)
279 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
280 if (!error) {
281 lrupos = 0;
282 mtx_lock(&np->n_mtx);
283 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
284 if (np->n_accesscache[i].uid == cred->cr_uid) {
285 np->n_accesscache[i].mode = rmode;
286 np->n_accesscache[i].stamp = time_second;
287 break;
288 }
289 if (i > 0 && np->n_accesscache[i].stamp <
290 np->n_accesscache[lrupos].stamp)
291 lrupos = i;
292 }
293 if (i == NFS_ACCESSCACHESIZE) {
294 np->n_accesscache[lrupos].uid = cred->cr_uid;
295 np->n_accesscache[lrupos].mode = rmode;
296 np->n_accesscache[lrupos].stamp = time_second;
297 }
298 mtx_unlock(&np->n_mtx);
299 if (retmode != NULL)
300 *retmode = rmode;
301 } else if (NFS_ISV4(vp)) {
302 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
303 }
304 return (error);
305}
306
307/*
308 * nfs access vnode op.
309 * For nfs version 2, just return ok. File accesses may fail later.
310 * For nfs version 3, use the access rpc to check accessibility. If file modes
311 * are changed on the server, accesses might still fail later.
312 */
313static int
314nfs_access(struct vop_access_args *ap)
315{
316 struct vnode *vp = ap->a_vp;
317 int error = 0, i, gotahit;
318 u_int32_t mode, wmode, rmode;
319 int v34 = NFS_ISV34(vp);
320 struct nfsnode *np = VTONFS(vp);
321
322 /*
323 * Disallow write attempts on filesystems mounted read-only;
324 * unless the file is a socket, fifo, or a block or character
325 * device resident on the filesystem.
326 */
327 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
328 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
329 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
330 switch (vp->v_type) {
331 case VREG:
332 case VDIR:
333 case VLNK:
334 return (EROFS);
335 default:
336 break;
337 }
338 }
339 /*
340 * For nfs v3 or v4, check to see if we have done this recently, and if
341 * so return our cached result instead of making an ACCESS call.
342 * If not, do an access rpc, otherwise you are stuck emulating
343 * ufs_access() locally using the vattr. This may not be correct,
344 * since the server may apply other access criteria such as
345 * client uid-->server uid mapping that we do not know about.
346 */
347 if (v34) {
348 if (ap->a_accmode & VREAD)
349 mode = NFSACCESS_READ;
350 else
351 mode = 0;
352 if (vp->v_type != VDIR) {
353 if (ap->a_accmode & VWRITE)
354 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
355 if (ap->a_accmode & VAPPEND)
356 mode |= NFSACCESS_EXTEND;
357 if (ap->a_accmode & VEXEC)
358 mode |= NFSACCESS_EXECUTE;
359 if (ap->a_accmode & VDELETE)
360 mode |= NFSACCESS_DELETE;
361 } else {
362 if (ap->a_accmode & VWRITE)
363 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
364 if (ap->a_accmode & VAPPEND)
365 mode |= NFSACCESS_EXTEND;
366 if (ap->a_accmode & VEXEC)
367 mode |= NFSACCESS_LOOKUP;
368 if (ap->a_accmode & VDELETE)
369 mode |= NFSACCESS_DELETE;
370 if (ap->a_accmode & VDELETE_CHILD)
371 mode |= NFSACCESS_MODIFY;
372 }
373 /* XXX safety belt, only make blanket request if caching */
374 if (nfsaccess_cache_timeout > 0) {
375 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
376 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
377 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
378 } else {
379 wmode = mode;
380 }
381
382 /*
383 * Does our cached result allow us to give a definite yes to
384 * this request?
385 */
386 gotahit = 0;
387 mtx_lock(&np->n_mtx);
388 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
389 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
390 if (time_second < (np->n_accesscache[i].stamp
391 + nfsaccess_cache_timeout) &&
392 (np->n_accesscache[i].mode & mode) == mode) {
393 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
394 gotahit = 1;
395 }
396 break;
397 }
398 }
399 mtx_unlock(&np->n_mtx);
400 if (gotahit == 0) {
401 /*
402 * Either a no, or a don't know. Go to the wire.
403 */
404 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
405 error = nfs34_access_otw(vp, wmode, ap->a_td,
406 ap->a_cred, &rmode);
407 if (!error &&
408 (rmode & mode) != mode)
409 error = EACCES;
410 }
411 return (error);
412 } else {
413 if ((error = nfsspec_access(ap)) != 0) {
414 return (error);
415 }
416 /*
417 * Attempt to prevent a mapped root from accessing a file
418 * which it shouldn't. We try to read a byte from the file
419 * if the user is root and the file is not zero length.
420 * After calling nfsspec_access, we should have the correct
421 * file size cached.
422 */
423 mtx_lock(&np->n_mtx);
424 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
425 && VTONFS(vp)->n_size > 0) {
426 struct iovec aiov;
427 struct uio auio;
428 char buf[1];
429
430 mtx_unlock(&np->n_mtx);
431 aiov.iov_base = buf;
432 aiov.iov_len = 1;
433 auio.uio_iov = &aiov;
434 auio.uio_iovcnt = 1;
435 auio.uio_offset = 0;
436 auio.uio_resid = 1;
437 auio.uio_segflg = UIO_SYSSPACE;
438 auio.uio_rw = UIO_READ;
439 auio.uio_td = ap->a_td;
440
441 if (vp->v_type == VREG)
442 error = ncl_readrpc(vp, &auio, ap->a_cred);
443 else if (vp->v_type == VDIR) {
444 char* bp;
445 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
446 aiov.iov_base = bp;
447 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
448 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
449 ap->a_td);
450 free(bp, M_TEMP);
451 } else if (vp->v_type == VLNK)
452 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
453 else
454 error = EACCES;
455 } else
456 mtx_unlock(&np->n_mtx);
457 return (error);
458 }
459}
460
461
462/*
463 * nfs open vnode op
464 * Check to see if the type is ok
465 * and that deletion is not in progress.
466 * For paged in text files, you will need to flush the page cache
467 * if consistency is lost.
468 */
469/* ARGSUSED */
470static int
471nfs_open(struct vop_open_args *ap)
472{
473 struct vnode *vp = ap->a_vp;
474 struct nfsnode *np = VTONFS(vp);
475 struct vattr vattr;
476 int error;
477 int fmode = ap->a_mode;
478
479 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
480 return (EOPNOTSUPP);
481
482 /*
483 * For NFSv4, we need to do the Open Op before cache validation,
484 * so that we conform to RFC3530 Sec. 9.3.1.
485 */
486 if (NFS_ISV4(vp)) {
487 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
488 if (error) {
489 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
490 (gid_t)0);
491 return (error);
492 }
493 }
494
495 /*
496 * Now, if this Open will be doing reading, re-validate/flush the
497 * cache, so that Close/Open coherency is maintained.
498 */
499 mtx_lock(&np->n_mtx);
500 if (np->n_flag & NMODIFIED) {
501 mtx_unlock(&np->n_mtx);
502 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
503 if (error == EINTR || error == EIO) {
504 if (NFS_ISV4(vp))
505 (void) nfsrpc_close(vp, 0, ap->a_td);
506 return (error);
507 }
508 mtx_lock(&np->n_mtx);
509 np->n_attrstamp = 0;
510 if (vp->v_type == VDIR)
511 np->n_direofoffset = 0;
512 mtx_unlock(&np->n_mtx);
513 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
514 if (error) {
515 if (NFS_ISV4(vp))
516 (void) nfsrpc_close(vp, 0, ap->a_td);
517 return (error);
518 }
519 mtx_lock(&np->n_mtx);
520 np->n_mtime = vattr.va_mtime;
521 if (NFS_ISV4(vp))
522 np->n_change = vattr.va_filerev;
523 } else {
524 mtx_unlock(&np->n_mtx);
525 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
526 if (error) {
527 if (NFS_ISV4(vp))
528 (void) nfsrpc_close(vp, 0, ap->a_td);
529 return (error);
530 }
531 mtx_lock(&np->n_mtx);
532 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
533 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
534 if (vp->v_type == VDIR)
535 np->n_direofoffset = 0;
536 mtx_unlock(&np->n_mtx);
537 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
538 if (error == EINTR || error == EIO) {
539 if (NFS_ISV4(vp))
540 (void) nfsrpc_close(vp, 0, ap->a_td);
541 return (error);
542 }
543 mtx_lock(&np->n_mtx);
544 np->n_mtime = vattr.va_mtime;
545 if (NFS_ISV4(vp))
546 np->n_change = vattr.va_filerev;
547 }
548 }
549
550 /*
551 * If the object has >= 1 O_DIRECT active opens, we disable caching.
552 */
553 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
554 (vp->v_type == VREG)) {
555 if (np->n_directio_opens == 0) {
556 mtx_unlock(&np->n_mtx);
557 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
558 if (error) {
559 if (NFS_ISV4(vp))
560 (void) nfsrpc_close(vp, 0, ap->a_td);
561 return (error);
562 }
563 mtx_lock(&np->n_mtx);
564 np->n_flag |= NNONCACHE;
565 }
566 np->n_directio_opens++;
567 }
568 mtx_unlock(&np->n_mtx);
569 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
570 return (0);
571}
572
573/*
574 * nfs close vnode op
575 * What an NFS client should do upon close after writing is a debatable issue.
576 * Most NFS clients push delayed writes to the server upon close, basically for
577 * two reasons:
578 * 1 - So that any write errors may be reported back to the client process
579 * doing the close system call. By far the two most likely errors are
580 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
581 * 2 - To put a worst case upper bound on cache inconsistency between
582 * multiple clients for the file.
583 * There is also a consistency problem for Version 2 of the protocol w.r.t.
584 * not being able to tell if other clients are writing a file concurrently,
585 * since there is no way of knowing if the changed modify time in the reply
586 * is only due to the write for this client.
587 * (NFS Version 3 provides weak cache consistency data in the reply that
588 * should be sufficient to detect and handle this case.)
589 *
590 * The current code does the following:
591 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
592 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
593 * or commit them (this satisfies 1 and 2 except for the
594 * case where the server crashes after this close but
595 * before the commit RPC, which is felt to be "good
596 * enough". Changing the last argument to ncl_flush() to
597 * a 1 would force a commit operation, if it is felt a
598 * commit is necessary now.
599 * for NFS Version 4 - flush the dirty buffers and commit them, if
600 * nfscl_mustflush() says this is necessary.
601 * It is necessary if there is no write delegation held,
602 * in order to satisfy open/close coherency.
603 * If the file isn't cached on local stable storage,
604 * it may be necessary in order to detect "out of space"
605 * errors from the server, if the write delegation
606 * issued by the server doesn't allow the file to grow.
607 */
608/* ARGSUSED */
609static int
610nfs_close(struct vop_close_args *ap)
611{
612 struct vnode *vp = ap->a_vp;
613 struct nfsnode *np = VTONFS(vp);
614 struct nfsvattr nfsva;
615 struct ucred *cred;
616 int error = 0, ret, localcred = 0;
617 int fmode = ap->a_fflag;
618
619 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
620 return (0);
621 /*
622 * During shutdown, a_cred isn't valid, so just use root.
623 */
624 if (ap->a_cred == NOCRED) {
625 cred = newnfs_getcred();
626 localcred = 1;
627 } else {
628 cred = ap->a_cred;
629 }
630 if (vp->v_type == VREG) {
631 /*
632 * Examine and clean dirty pages, regardless of NMODIFIED.
633 * This closes a major hole in close-to-open consistency.
634 * We want to push out all dirty pages (and buffers) on
635 * close, regardless of whether they were dirtied by
636 * mmap'ed writes or via write().
637 */
638 if (nfs_clean_pages_on_close && vp->v_object) {
639 VM_OBJECT_LOCK(vp->v_object);
640 vm_object_page_clean(vp->v_object, 0, 0, 0);
641 VM_OBJECT_UNLOCK(vp->v_object);
642 }
643 mtx_lock(&np->n_mtx);
644 if (np->n_flag & NMODIFIED) {
645 mtx_unlock(&np->n_mtx);
646 if (NFS_ISV3(vp)) {
647 /*
648 * Under NFSv3 we have dirty buffers to dispose of. We
649 * must flush them to the NFS server. We have the option
650 * of waiting all the way through the commit rpc or just
651 * waiting for the initial write. The default is to only
652 * wait through the initial write so the data is in the
653 * server's cache, which is roughly similar to the state
654 * a standard disk subsystem leaves the file in on close().
655 *
656 * We cannot clear the NMODIFIED bit in np->n_flag due to
657 * potential races with other processes, and certainly
658 * cannot clear it if we don't commit.
659 * These races occur when there is no longer the old
660 * traditional vnode locking implemented for Vnode Ops.
661 */
662 int cm = newnfs_commit_on_close ? 1 : 0;
663 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
664 /* np->n_flag &= ~NMODIFIED; */
665 } else if (NFS_ISV4(vp)) {
666 if (nfscl_mustflush(vp) != 0) {
667 int cm = newnfs_commit_on_close ? 1 : 0;
668 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
669 cm, 0);
670 /*
671 * as above w.r.t races when clearing
672 * NMODIFIED.
673 * np->n_flag &= ~NMODIFIED;
674 */
675 }
676 } else
677 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
678 mtx_lock(&np->n_mtx);
679 }
680 /*
681 * Invalidate the attribute cache in all cases.
682 * An open is going to fetch fresh attrs any way, other procs
683 * on this node that have file open will be forced to do an
684 * otw attr fetch, but this is safe.
685 * --> A user found that their RPC count dropped by 20% when
686 * this was commented out and I can't see any requirement
687 * for it, so I've disabled it when negative lookups are
688 * enabled. (What does this have to do with negative lookup
689 * caching? Well nothing, except it was reported by the
690 * same user that needed negative lookup caching and I wanted
691 * there to be a way to disable it to see if it
692 * is the cause of some caching/coherency issue that might
693 * crop up.)
694 */
695 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0)
696 np->n_attrstamp = 0;
697 if (np->n_flag & NWRITEERR) {
698 np->n_flag &= ~NWRITEERR;
699 error = np->n_error;
700 }
701 mtx_unlock(&np->n_mtx);
702 }
703
704 if (NFS_ISV4(vp)) {
705 /*
706 * Get attributes so "change" is up to date.
707 */
708 if (error == 0 && nfscl_mustflush(vp) != 0) {
709 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
710 NULL);
711 if (!ret) {
712 np->n_change = nfsva.na_filerev;
713 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
714 NULL, 0, 0);
715 }
716 }
717
718 /*
719 * and do the close.
720 */
721 ret = nfsrpc_close(vp, 0, ap->a_td);
722 if (!error && ret)
723 error = ret;
724 if (error)
725 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
726 (gid_t)0);
727 }
728 if (newnfs_directio_enable)
729 KASSERT((np->n_directio_asyncwr == 0),
730 ("nfs_close: dirty unflushed (%d) directio buffers\n",
731 np->n_directio_asyncwr));
732 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
733 mtx_lock(&np->n_mtx);
734 KASSERT((np->n_directio_opens > 0),
735 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
736 np->n_directio_opens--;
737 if (np->n_directio_opens == 0)
738 np->n_flag &= ~NNONCACHE;
739 mtx_unlock(&np->n_mtx);
740 }
741 if (localcred)
742 NFSFREECRED(cred);
743 return (error);
744}
745
746/*
747 * nfs getattr call from vfs.
748 */
749static int
750nfs_getattr(struct vop_getattr_args *ap)
751{
752 struct vnode *vp = ap->a_vp;
753 struct thread *td = curthread; /* XXX */
754 struct nfsnode *np = VTONFS(vp);
755 int error = 0;
756 struct nfsvattr nfsva;
757 struct vattr *vap = ap->a_vap;
758 struct vattr vattr;
759
760 /*
761 * Update local times for special files.
762 */
763 mtx_lock(&np->n_mtx);
764 if (np->n_flag & (NACC | NUPD))
765 np->n_flag |= NCHG;
766 mtx_unlock(&np->n_mtx);
767 /*
768 * First look in the cache.
769 */
770 if (ncl_getattrcache(vp, &vattr) == 0) {
771 vap->va_type = vattr.va_type;
772 vap->va_mode = vattr.va_mode;
773 vap->va_nlink = vattr.va_nlink;
774 vap->va_uid = vattr.va_uid;
775 vap->va_gid = vattr.va_gid;
776 vap->va_fsid = vattr.va_fsid;
777 vap->va_fileid = vattr.va_fileid;
778 vap->va_size = vattr.va_size;
779 vap->va_blocksize = vattr.va_blocksize;
780 vap->va_atime = vattr.va_atime;
781 vap->va_mtime = vattr.va_mtime;
782 vap->va_ctime = vattr.va_ctime;
783 vap->va_gen = vattr.va_gen;
784 vap->va_flags = vattr.va_flags;
785 vap->va_rdev = vattr.va_rdev;
786 vap->va_bytes = vattr.va_bytes;
787 vap->va_filerev = vattr.va_filerev;
788 /*
789 * Get the local modify time for the case of a write
790 * delegation.
791 */
792 nfscl_deleggetmodtime(vp, &vap->va_mtime);
793 return (0);
794 }
795
796 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
797 nfsaccess_cache_timeout > 0) {
798 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
799 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
800 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
801 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
802 return (0);
803 }
804 }
805 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
806 if (!error)
807 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
808 if (!error) {
809 /*
810 * Get the local modify time for the case of a write
811 * delegation.
812 */
813 nfscl_deleggetmodtime(vp, &vap->va_mtime);
814 } else if (NFS_ISV4(vp)) {
815 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
816 }
817 return (error);
818}
819
820/*
821 * nfs setattr call.
822 */
823static int
824nfs_setattr(struct vop_setattr_args *ap)
825{
826 struct vnode *vp = ap->a_vp;
827 struct nfsnode *np = VTONFS(vp);
828 struct thread *td = curthread; /* XXX */
829 struct vattr *vap = ap->a_vap;
830 int error = 0;
831 u_quad_t tsize;
832
833#ifndef nolint
834 tsize = (u_quad_t)0;
835#endif
836
837 /*
838 * Setting of flags and marking of atimes are not supported.
839 */
840 if (vap->va_flags != VNOVAL)
841 return (EOPNOTSUPP);
842
843 /*
844 * Disallow write attempts if the filesystem is mounted read-only.
845 */
846 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
847 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
848 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
849 (vp->v_mount->mnt_flag & MNT_RDONLY))
850 return (EROFS);
851 if (vap->va_size != VNOVAL) {
852 switch (vp->v_type) {
853 case VDIR:
854 return (EISDIR);
855 case VCHR:
856 case VBLK:
857 case VSOCK:
858 case VFIFO:
859 if (vap->va_mtime.tv_sec == VNOVAL &&
860 vap->va_atime.tv_sec == VNOVAL &&
861 vap->va_mode == (mode_t)VNOVAL &&
862 vap->va_uid == (uid_t)VNOVAL &&
863 vap->va_gid == (gid_t)VNOVAL)
864 return (0);
865 vap->va_size = VNOVAL;
866 break;
867 default:
868 /*
869 * Disallow write attempts if the filesystem is
870 * mounted read-only.
871 */
872 if (vp->v_mount->mnt_flag & MNT_RDONLY)
873 return (EROFS);
874 /*
875 * We run vnode_pager_setsize() early (why?),
876 * we must set np->n_size now to avoid vinvalbuf
877 * V_SAVE races that might setsize a lower
878 * value.
879 */
880 mtx_lock(&np->n_mtx);
881 tsize = np->n_size;
882 mtx_unlock(&np->n_mtx);
883 error = ncl_meta_setsize(vp, ap->a_cred, td,
884 vap->va_size);
885 mtx_lock(&np->n_mtx);
886 if (np->n_flag & NMODIFIED) {
887 tsize = np->n_size;
888 mtx_unlock(&np->n_mtx);
889 if (vap->va_size == 0)
890 error = ncl_vinvalbuf(vp, 0, td, 1);
891 else
892 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
893 if (error) {
894 vnode_pager_setsize(vp, tsize);
895 return (error);
896 }
897 /*
898 * Call nfscl_delegmodtime() to set the modify time
899 * locally, as required.
900 */
901 nfscl_delegmodtime(vp);
902 } else
903 mtx_unlock(&np->n_mtx);
904 /*
905 * np->n_size has already been set to vap->va_size
906 * in ncl_meta_setsize(). We must set it again since
907 * nfs_loadattrcache() could be called through
908 * ncl_meta_setsize() and could modify np->n_size.
909 */
910 mtx_lock(&np->n_mtx);
911 np->n_vattr.na_size = np->n_size = vap->va_size;
912 mtx_unlock(&np->n_mtx);
913 };
914 } else {
915 mtx_lock(&np->n_mtx);
916 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
917 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
918 mtx_unlock(&np->n_mtx);
919 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
920 (error == EINTR || error == EIO))
921 return (error);
922 } else
923 mtx_unlock(&np->n_mtx);
924 }
925 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
926 if (error && vap->va_size != VNOVAL) {
927 mtx_lock(&np->n_mtx);
928 np->n_size = np->n_vattr.na_size = tsize;
929 vnode_pager_setsize(vp, tsize);
930 mtx_unlock(&np->n_mtx);
931 }
932 return (error);
933}
934
935/*
936 * Do an nfs setattr rpc.
937 */
938static int
939nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
940 struct thread *td)
941{
942 struct nfsnode *np = VTONFS(vp);
943 int error, ret, attrflag, i;
944 struct nfsvattr nfsva;
945
946 if (NFS_ISV34(vp)) {
947 mtx_lock(&np->n_mtx);
948 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
949 np->n_accesscache[i].stamp = 0;
950 np->n_flag |= NDELEGMOD;
951 mtx_unlock(&np->n_mtx);
952 }
953 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
954 NULL);
955 if (attrflag) {
956 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
957 if (ret && !error)
958 error = ret;
959 }
960 if (error && NFS_ISV4(vp))
961 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
962 return (error);
963}
964
965/*
966 * nfs lookup call, one step at a time...
967 * First look in cache
968 * If not found, unlock the directory nfsnode and do the rpc
969 */
970static int
971nfs_lookup(struct vop_lookup_args *ap)
972{
973 struct componentname *cnp = ap->a_cnp;
974 struct vnode *dvp = ap->a_dvp;
975 struct vnode **vpp = ap->a_vpp;
976 struct mount *mp = dvp->v_mount;
977 int flags = cnp->cn_flags;
978 struct vnode *newvp;
979 struct nfsmount *nmp;
980 struct nfsnode *np, *newnp;
981 int error = 0, attrflag, dattrflag, ltype;
982 struct thread *td = cnp->cn_thread;
983 struct nfsfh *nfhp;
984 struct nfsvattr dnfsva, nfsva;
985 struct vattr vattr;
986 struct timespec dmtime;
987
988 *vpp = NULLVP;
989 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
990 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
991 return (EROFS);
992 if (dvp->v_type != VDIR)
993 return (ENOTDIR);
994 nmp = VFSTONFS(mp);
995 np = VTONFS(dvp);
996
997 /* For NFSv4, wait until any remove is done. */
998 mtx_lock(&np->n_mtx);
999 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1000 np->n_flag |= NREMOVEWANT;
1001 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1002 }
1003 mtx_unlock(&np->n_mtx);
1004
1005 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
1006 return (error);
1007 error = cache_lookup(dvp, vpp, cnp);
1008 if (error > 0 && error != ENOENT)
1009 return (error);
1010 if (error == -1) {
1011 /*
1012 * We only accept a positive hit in the cache if the
1013 * change time of the file matches our cached copy.
1014 * Otherwise, we discard the cache entry and fallback
1015 * to doing a lookup RPC.
1016 *
1017 * To better handle stale file handles and attributes,
1018 * clear the attribute cache of this node if it is a
1019 * leaf component, part of an open() call, and not
1020 * locally modified before fetching the attributes.
1021 * This should allow stale file handles to be detected
1022 * here where we can fall back to a LOOKUP RPC to
1023 * recover rather than having nfs_open() detect the
1024 * stale file handle and failing open(2) with ESTALE.
1025 */
1026 newvp = *vpp;
1027 newnp = VTONFS(newvp);
1028 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1029 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1030 !(newnp->n_flag & NMODIFIED)) {
1031 mtx_lock(&newnp->n_mtx);
1032 newnp->n_attrstamp = 0;
1033 mtx_unlock(&newnp->n_mtx);
1034 }
1035 if (nfscl_nodeleg(newvp, 0) == 0 ||
1036 (VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1037 timespeccmp(&vattr.va_ctime, &newnp->n_ctime, ==))) {
1038 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1039 if (cnp->cn_nameiop != LOOKUP &&
1040 (flags & ISLASTCN))
1041 cnp->cn_flags |= SAVENAME;
1042 return (0);
1043 }
1044 cache_purge(newvp);
1045 if (dvp != newvp)
1046 vput(newvp);
1047 else
1048 vrele(newvp);
1049 *vpp = NULLVP;
1050 } else if (error == ENOENT) {
1051 if (dvp->v_iflag & VI_DOOMED)
1052 return (ENOENT);
1053 /*
1054 * We only accept a negative hit in the cache if the
1055 * modification time of the parent directory matches
1056 * our cached copy. Otherwise, we discard all of the
1057 * negative cache entries for this directory. We also
1058 * only trust -ve cache entries for less than
1059 * nm_negative_namecache_timeout seconds.
1060 */
1061 if ((u_int)(ticks - np->n_dmtime_ticks) <
1062 (nmp->nm_negnametimeo * hz) &&
1063 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1064 timespeccmp(&vattr.va_mtime, &np->n_dmtime, ==)) {
1065 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1066 return (ENOENT);
1067 }
1068 cache_purge_negative(dvp);
1069 mtx_lock(&np->n_mtx);
1070 timespecclear(&np->n_dmtime);
1071 mtx_unlock(&np->n_mtx);
1072 }
1073
1074 /*
1075 * Cache the modification time of the parent directory in case
1076 * the lookup fails and results in adding the first negative
1077 * name cache entry for the directory. Since this is reading
1078 * a single time_t, don't bother with locking. The
1079 * modification time may be a bit stale, but it must be read
1080 * before performing the lookup RPC to prevent a race where
1081 * another lookup updates the timestamp on the directory after
1082 * the lookup RPC has been performed on the server but before
1083 * n_dmtime is set at the end of this function.
1084 */
1085 dmtime = np->n_vattr.na_mtime;
1086 error = 0;
1087 newvp = NULLVP;
1088 NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
1089 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1090 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1091 NULL);
1092 if (dattrflag)
1093 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1094 if (error) {
1095 if (newvp != NULLVP) {
1096 vput(newvp);
1097 *vpp = NULLVP;
1098 }
1099
1100 if (error != ENOENT) {
1101 if (NFS_ISV4(dvp))
1102 error = nfscl_maperr(td, error, (uid_t)0,
1103 (gid_t)0);
1104 return (error);
1105 }
1106
1107 /* The requested file was not found. */
1108 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1109 (flags & ISLASTCN)) {
1110 /*
1111 * XXX: UFS does a full VOP_ACCESS(dvp,
1112 * VWRITE) here instead of just checking
1113 * MNT_RDONLY.
1114 */
1115 if (mp->mnt_flag & MNT_RDONLY)
1116 return (EROFS);
1117 cnp->cn_flags |= SAVENAME;
1118 return (EJUSTRETURN);
1119 }
1120
1121 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) {
1122 /*
1123 * Maintain n_dmtime as the modification time
1124 * of the parent directory when the oldest -ve
1125 * name cache entry for this directory was
1126 * added. If a -ve cache entry has already
1127 * been added with a newer modification time
1128 * by a concurrent lookup, then don't bother
1129 * adding a cache entry. The modification
1130 * time of the directory might have changed
1131 * due to the file this lookup failed to find
1132 * being created. In that case a subsequent
1133 * lookup would incorrectly use the entry
1134 * added here instead of doing an extra
1135 * lookup.
1136 */
1137 mtx_lock(&np->n_mtx);
1138 if (timespeccmp(&np->n_dmtime, &dmtime, <=)) {
1139 if (!timespecisset(&np->n_dmtime)) {
1140 np->n_dmtime = dmtime;
1141 np->n_dmtime_ticks = ticks;
1142 }
1143 mtx_unlock(&np->n_mtx);
1144 cache_enter(dvp, NULL, cnp);
1145 } else
1146 mtx_unlock(&np->n_mtx);
1147 }
1148 return (ENOENT);
1149 }
1150
1151 /*
1152 * Handle RENAME case...
1153 */
1154 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1155 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1156 FREE((caddr_t)nfhp, M_NFSFH);
1157 return (EISDIR);
1158 }
1159 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1160 LK_EXCLUSIVE);
1161 if (error)
1162 return (error);
1163 newvp = NFSTOV(np);
1164 if (attrflag)
1165 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1166 0, 1);
1167 *vpp = newvp;
1168 cnp->cn_flags |= SAVENAME;
1169 return (0);
1170 }
1171
1172 if (flags & ISDOTDOT) {
1173 ltype = VOP_ISLOCKED(dvp);
1174 error = vfs_busy(mp, MBF_NOWAIT);
1175 if (error != 0) {
1176 vfs_ref(mp);
1177 VOP_UNLOCK(dvp, 0);
1178 error = vfs_busy(mp, 0);
1179 vn_lock(dvp, ltype | LK_RETRY);
1180 vfs_rel(mp);
1181 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1182 vfs_unbusy(mp);
1183 error = ENOENT;
1184 }
1185 if (error != 0)
1186 return (error);
1187 }
1188 VOP_UNLOCK(dvp, 0);
1189 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1190 cnp->cn_lkflags);
1191 if (error == 0)
1192 newvp = NFSTOV(np);
1193 vfs_unbusy(mp);
1194 if (newvp != dvp)
1195 vn_lock(dvp, ltype | LK_RETRY);
1196 if (dvp->v_iflag & VI_DOOMED) {
1197 if (error == 0) {
1198 if (newvp == dvp)
1199 vrele(newvp);
1200 else
1201 vput(newvp);
1202 }
1203 error = ENOENT;
1204 }
1205 if (error != 0)
1206 return (error);
1207 if (attrflag)
1208 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1209 0, 1);
1210 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1211 FREE((caddr_t)nfhp, M_NFSFH);
1212 VREF(dvp);
1213 newvp = dvp;
1214 if (attrflag)
1215 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1216 0, 1);
1217 } else {
1218 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1219 cnp->cn_lkflags);
1220 if (error)
1221 return (error);
1222 newvp = NFSTOV(np);
1223 if (attrflag)
1224 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1225 0, 1);
1226 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1227 !(np->n_flag & NMODIFIED)) {
1228 /*
1229 * Flush the attribute cache when opening a
1230 * leaf node to ensure that fresh attributes
1231 * are fetched in nfs_open() since we did not
1232 * fetch attributes from the LOOKUP reply.
1233 */
1234 mtx_lock(&np->n_mtx);
1235 np->n_attrstamp = 0;
1236 mtx_unlock(&np->n_mtx);
1237 }
1238 }
1239 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1240 cnp->cn_flags |= SAVENAME;
1241 if ((cnp->cn_flags & MAKEENTRY) &&
1242 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
1243 np->n_ctime = np->n_vattr.na_vattr.va_ctime;
1244 cache_enter(dvp, newvp, cnp);
1245 }
1246 *vpp = newvp;
1247 return (0);
1248}
1249
1250/*
1251 * nfs read call.
1252 * Just call ncl_bioread() to do the work.
1253 */
1254static int
1255nfs_read(struct vop_read_args *ap)
1256{
1257 struct vnode *vp = ap->a_vp;
1258
1259 switch (vp->v_type) {
1260 case VREG:
1261 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1262 case VDIR:
1263 return (EISDIR);
1264 default:
1265 return (EOPNOTSUPP);
1266 }
1267}
1268
1269/*
1270 * nfs readlink call
1271 */
1272static int
1273nfs_readlink(struct vop_readlink_args *ap)
1274{
1275 struct vnode *vp = ap->a_vp;
1276
1277 if (vp->v_type != VLNK)
1278 return (EINVAL);
1279 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1280}
1281
1282/*
1283 * Do a readlink rpc.
1284 * Called by ncl_doio() from below the buffer cache.
1285 */
1286int
1287ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1288{
1289 int error, ret, attrflag;
1290 struct nfsvattr nfsva;
1291
1292 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1293 &attrflag, NULL);
1294 if (attrflag) {
1295 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1296 if (ret && !error)
1297 error = ret;
1298 }
1299 if (error && NFS_ISV4(vp))
1300 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1301 return (error);
1302}
1303
1304/*
1305 * nfs read rpc call
1306 * Ditto above
1307 */
1308int
1309ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1310{
1311 int error, ret, attrflag;
1312 struct nfsvattr nfsva;
1313
1314 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, &attrflag,
1315 NULL);
1316 if (attrflag) {
1317 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1318 if (ret && !error)
1319 error = ret;
1320 }
1321 if (error && NFS_ISV4(vp))
1322 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1323 return (error);
1324}
1325
1326/*
1327 * nfs write call
1328 */
1329int
1330ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1331 int *iomode, int *must_commit, int called_from_strategy)
1332{
1333 struct nfsvattr nfsva;
1334 int error = 0, attrflag, ret;
1335
1336 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1337 uiop->uio_td, &nfsva, &attrflag, NULL, called_from_strategy);
1338 if (attrflag) {
1339 if (VTONFS(vp)->n_flag & ND_NFSV4)
1340 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1341 1);
1342 else
1343 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1344 1);
1345 if (ret && !error)
1346 error = ret;
1347 }
1348 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC)
1349 *iomode = NFSWRITE_FILESYNC;
1350 if (error && NFS_ISV4(vp))
1351 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1352 return (error);
1353}
1354
1355/*
1356 * nfs mknod rpc
1357 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1358 * mode set to specify the file type and the size field for rdev.
1359 */
1360static int
1361nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1362 struct vattr *vap)
1363{
1364 struct nfsvattr nfsva, dnfsva;
1365 struct vnode *newvp = NULL;
1366 struct nfsnode *np = NULL, *dnp;
1367 struct nfsfh *nfhp;
1368 struct vattr vattr;
1369 int error = 0, attrflag, dattrflag;
1370 u_int32_t rdev;
1371
1372 if (vap->va_type == VCHR || vap->va_type == VBLK)
1373 rdev = vap->va_rdev;
1374 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1375 rdev = 0xffffffff;
1376 else
1377 return (EOPNOTSUPP);
1378 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1379 return (error);
1380 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1381 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1382 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1383 if (!error) {
1384 if (!nfhp)
1385 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1386 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1387 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1388 NULL);
1389 if (nfhp)
1390 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1391 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1392 }
1393 if (dattrflag)
1394 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1395 if (!error) {
1396 newvp = NFSTOV(np);
1397 if (attrflag != 0) {
1398 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1399 0, 1);
1400 if (error != 0)
1401 vput(newvp);
1402 }
1403 }
1404 if (!error) {
1405 if ((cnp->cn_flags & MAKEENTRY))
1406 cache_enter(dvp, newvp, cnp);
1407 *vpp = newvp;
1408 } else if (NFS_ISV4(dvp)) {
1409 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1410 vap->va_gid);
1411 }
1412 dnp = VTONFS(dvp);
1413 mtx_lock(&dnp->n_mtx);
1414 dnp->n_flag |= NMODIFIED;
1415 if (!dattrflag)
1416 dnp->n_attrstamp = 0;
1417 mtx_unlock(&dnp->n_mtx);
1418 return (error);
1419}
1420
1421/*
1422 * nfs mknod vop
1423 * just call nfs_mknodrpc() to do the work.
1424 */
1425/* ARGSUSED */
1426static int
1427nfs_mknod(struct vop_mknod_args *ap)
1428{
1429 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1430}
1431
1432static struct mtx nfs_cverf_mtx;
1433MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1434 MTX_DEF);
1435
1436static nfsquad_t
1437nfs_get_cverf(void)
1438{
1439 static nfsquad_t cverf;
1440 nfsquad_t ret;
1441 static int cverf_initialized = 0;
1442
1443 mtx_lock(&nfs_cverf_mtx);
1444 if (cverf_initialized == 0) {
1445 cverf.lval[0] = arc4random();
1446 cverf.lval[1] = arc4random();
1447 cverf_initialized = 1;
1448 } else
1449 cverf.qval++;
1450 ret = cverf;
1451 mtx_unlock(&nfs_cverf_mtx);
1452
1453 return (ret);
1454}
1455
1456/*
1457 * nfs file create call
1458 */
1459static int
1460nfs_create(struct vop_create_args *ap)
1461{
1462 struct vnode *dvp = ap->a_dvp;
1463 struct vattr *vap = ap->a_vap;
1464 struct componentname *cnp = ap->a_cnp;
1465 struct nfsnode *np = NULL, *dnp;
1466 struct vnode *newvp = NULL;
1467 struct nfsmount *nmp;
1468 struct nfsvattr dnfsva, nfsva;
1469 struct nfsfh *nfhp;
1470 nfsquad_t cverf;
1471 int error = 0, attrflag, dattrflag, fmode = 0;
1472 struct vattr vattr;
1473
1474 /*
1475 * Oops, not for me..
1476 */
1477 if (vap->va_type == VSOCK)
1478 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1479
1480 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1481 return (error);
1482 if (vap->va_vaflags & VA_EXCLUSIVE)
1483 fmode |= O_EXCL;
1484 dnp = VTONFS(dvp);
1485 nmp = VFSTONFS(vnode_mount(dvp));
1486again:
1487 /* For NFSv4, wait until any remove is done. */
1488 mtx_lock(&dnp->n_mtx);
1489 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1490 dnp->n_flag |= NREMOVEWANT;
1491 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1492 }
1493 mtx_unlock(&dnp->n_mtx);
1494
1495 cverf = nfs_get_cverf();
1496 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1497 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1498 &nfhp, &attrflag, &dattrflag, NULL);
1499 if (!error) {
1500 if (nfhp == NULL)
1501 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1502 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1503 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1504 NULL);
1505 if (nfhp != NULL)
1506 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1507 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1508 }
1509 if (dattrflag)
1510 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1511 if (!error) {
1512 newvp = NFSTOV(np);
1513 if (attrflag)
1514 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1515 0, 1);
1516 }
1517 if (error) {
1518 if (newvp != NULL) {
1519 vput(newvp);
1520 newvp = NULL;
1521 }
1522 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1523 error == NFSERR_NOTSUPP) {
1524 fmode &= ~O_EXCL;
1525 goto again;
1526 }
1527 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1528 if (nfscl_checksattr(vap, &nfsva)) {
1529 /*
1530 * We are normally called with only a partially
1531 * initialized VAP. Since the NFSv3 spec says that
1532 * the server may use the file attributes to
1533 * store the verifier, the spec requires us to do a
1534 * SETATTR RPC. FreeBSD servers store the verifier in
1535 * atime, but we can't really assume that all servers
1536 * will so we ensure that our SETATTR sets both atime
1537 * and mtime.
1538 */
1539 if (vap->va_mtime.tv_sec == VNOVAL)
1540 vfs_timestamp(&vap->va_mtime);
1541 if (vap->va_atime.tv_sec == VNOVAL)
1542 vap->va_atime = vap->va_mtime;
1543 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1544 cnp->cn_thread, &nfsva, &attrflag, NULL);
1545 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1546 vap->va_gid != (gid_t)VNOVAL)) {
1547 /* try again without setting uid/gid */
1548 vap->va_uid = (uid_t)VNOVAL;
1549 vap->va_gid = (uid_t)VNOVAL;
1550 error = nfsrpc_setattr(newvp, vap, NULL,
1551 cnp->cn_cred, cnp->cn_thread, &nfsva,
1552 &attrflag, NULL);
1553 }
1554 if (attrflag)
1555 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1556 NULL, 0, 1);
1557 }
1558 }
1559 if (!error) {
1560 if (cnp->cn_flags & MAKEENTRY)
1561 cache_enter(dvp, newvp, cnp);
1562 *ap->a_vpp = newvp;
1563 } else if (NFS_ISV4(dvp)) {
1564 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1565 vap->va_gid);
1566 }
1567 mtx_lock(&dnp->n_mtx);
1568 dnp->n_flag |= NMODIFIED;
1569 if (!dattrflag)
1570 dnp->n_attrstamp = 0;
1571 mtx_unlock(&dnp->n_mtx);
1572 return (error);
1573}
1574
1575/*
1576 * nfs file remove call
1577 * To try and make nfs semantics closer to ufs semantics, a file that has
1578 * other processes using the vnode is renamed instead of removed and then
1579 * removed later on the last close.
1580 * - If v_usecount > 1
1581 * If a rename is not already in the works
1582 * call nfs_sillyrename() to set it up
1583 * else
1584 * do the remove rpc
1585 */
1586static int
1587nfs_remove(struct vop_remove_args *ap)
1588{
1589 struct vnode *vp = ap->a_vp;
1590 struct vnode *dvp = ap->a_dvp;
1591 struct componentname *cnp = ap->a_cnp;
1592 struct nfsnode *np = VTONFS(vp);
1593 int error = 0;
1594 struct vattr vattr;
1595
1596 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1597 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1598 if (vp->v_type == VDIR)
1599 error = EPERM;
1600 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1601 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1602 vattr.va_nlink > 1)) {
1603 /*
1604 * Purge the name cache so that the chance of a lookup for
1605 * the name succeeding while the remove is in progress is
1606 * minimized. Without node locking it can still happen, such
1607 * that an I/O op returns ESTALE, but since you get this if
1608 * another host removes the file..
1609 */
1610 cache_purge(vp);
1611 /*
1612 * throw away biocache buffers, mainly to avoid
1613 * unnecessary delayed writes later.
1614 */
1615 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1616 /* Do the rpc */
1617 if (error != EINTR && error != EIO)
1618 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1619 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1620 /*
1621 * Kludge City: If the first reply to the remove rpc is lost..
1622 * the reply to the retransmitted request will be ENOENT
1623 * since the file was in fact removed
1624 * Therefore, we cheat and return success.
1625 */
1626 if (error == ENOENT)
1627 error = 0;
1628 } else if (!np->n_sillyrename)
1629 error = nfs_sillyrename(dvp, vp, cnp);
1630 mtx_lock(&np->n_mtx);
1631 np->n_attrstamp = 0;
1632 mtx_unlock(&np->n_mtx);
1633 return (error);
1634}
1635
1636/*
1637 * nfs file remove rpc called from nfs_inactive
1638 */
1639int
1640ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1641{
1642 /*
1643 * Make sure that the directory vnode is still valid.
1644 * XXX we should lock sp->s_dvp here.
1645 */
1646 if (sp->s_dvp->v_type == VBAD)
1647 return (0);
1648 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1649 sp->s_cred, NULL));
1650}
1651
1652/*
1653 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1654 */
1655static int
1656nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1657 int namelen, struct ucred *cred, struct thread *td)
1658{
1659 struct nfsvattr dnfsva;
1660 struct nfsnode *dnp = VTONFS(dvp);
1661 int error = 0, dattrflag;
1662
1663 mtx_lock(&dnp->n_mtx);
1664 dnp->n_flag |= NREMOVEINPROG;
1665 mtx_unlock(&dnp->n_mtx);
1666 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1667 &dattrflag, NULL);
1668 mtx_lock(&dnp->n_mtx);
1669 if ((dnp->n_flag & NREMOVEWANT)) {
1670 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1671 mtx_unlock(&dnp->n_mtx);
1672 wakeup((caddr_t)dnp);
1673 } else {
1674 dnp->n_flag &= ~NREMOVEINPROG;
1675 mtx_unlock(&dnp->n_mtx);
1676 }
1677 if (dattrflag)
1678 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1679 mtx_lock(&dnp->n_mtx);
1680 dnp->n_flag |= NMODIFIED;
1681 if (!dattrflag)
1682 dnp->n_attrstamp = 0;
1683 mtx_unlock(&dnp->n_mtx);
1684 if (error && NFS_ISV4(dvp))
1685 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1686 return (error);
1687}
1688
1689/*
1690 * nfs file rename call
1691 */
1692static int
1693nfs_rename(struct vop_rename_args *ap)
1694{
1695 struct vnode *fvp = ap->a_fvp;
1696 struct vnode *tvp = ap->a_tvp;
1697 struct vnode *fdvp = ap->a_fdvp;
1698 struct vnode *tdvp = ap->a_tdvp;
1699 struct componentname *tcnp = ap->a_tcnp;
1700 struct componentname *fcnp = ap->a_fcnp;
1701 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1702 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1703 struct nfsv4node *newv4 = NULL;
1704 int error;
1705
1706 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1707 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1708 /* Check for cross-device rename */
1709 if ((fvp->v_mount != tdvp->v_mount) ||
1710 (tvp && (fvp->v_mount != tvp->v_mount))) {
1711 error = EXDEV;
1712 goto out;
1713 }
1714
1715 if (fvp == tvp) {
1716 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
1717 error = 0;
1718 goto out;
1719 }
1720 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
1721 goto out;
1722
1723 /*
1724 * We have to flush B_DELWRI data prior to renaming
1725 * the file. If we don't, the delayed-write buffers
1726 * can be flushed out later after the file has gone stale
1727 * under NFSV3. NFSV2 does not have this problem because
1728 * ( as far as I can tell ) it flushes dirty buffers more
1729 * often.
1730 *
1731 * Skip the rename operation if the fsync fails, this can happen
1732 * due to the server's volume being full, when we pushed out data
1733 * that was written back to our cache earlier. Not checking for
1734 * this condition can result in potential (silent) data loss.
1735 */
1736 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1737 VOP_UNLOCK(fvp, 0);
1738 if (!error && tvp)
1739 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1740 if (error)
1741 goto out;
1742
1743 /*
1744 * If the tvp exists and is in use, sillyrename it before doing the
1745 * rename of the new file over it.
1746 * XXX Can't sillyrename a directory.
1747 */
1748 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1749 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1750 vput(tvp);
1751 tvp = NULL;
1752 }
1753
1754 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1755 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1756 tcnp->cn_thread);
1757
1758 if (error == 0 && NFS_ISV4(tdvp)) {
1759 /*
1760 * For NFSv4, check to see if it is the same name and
1761 * replace the name, if it is different.
1762 */
1763 MALLOC(newv4, struct nfsv4node *,
1764 sizeof (struct nfsv4node) +
1765 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1766 M_NFSV4NODE, M_WAITOK);
1767 mtx_lock(&tdnp->n_mtx);
1768 mtx_lock(&fnp->n_mtx);
1769 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1770 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1771 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1772 tcnp->cn_namelen) ||
1773 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1774 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1775 tdnp->n_fhp->nfh_len))) {
1776#ifdef notdef
1777{ char nnn[100]; int nnnl;
1778nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1779bcopy(tcnp->cn_nameptr, nnn, nnnl);
1780nnn[nnnl] = '\0';
1781printf("ren replace=%s\n",nnn);
1782}
1783#endif
1784 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
1785 fnp->n_v4 = newv4;
1786 newv4 = NULL;
1787 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1788 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1789 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1790 tdnp->n_fhp->nfh_len);
1791 NFSBCOPY(tcnp->cn_nameptr,
1792 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1793 }
1794 mtx_unlock(&tdnp->n_mtx);
1795 mtx_unlock(&fnp->n_mtx);
1796 if (newv4 != NULL)
1797 FREE((caddr_t)newv4, M_NFSV4NODE);
1798 }
1799
1800 if (fvp->v_type == VDIR) {
1801 if (tvp != NULL && tvp->v_type == VDIR)
1802 cache_purge(tdvp);
1803 cache_purge(fdvp);
1804 }
1805
1806out:
1807 if (tdvp == tvp)
1808 vrele(tdvp);
1809 else
1810 vput(tdvp);
1811 if (tvp)
1812 vput(tvp);
1813 vrele(fdvp);
1814 vrele(fvp);
1815 /*
1816 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1817 */
1818 if (error == ENOENT)
1819 error = 0;
1820 return (error);
1821}
1822
1823/*
1824 * nfs file rename rpc called from nfs_remove() above
1825 */
1826static int
1827nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
1828 struct sillyrename *sp)
1829{
1830
1831 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
1832 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
1833 scnp->cn_thread));
1834}
1835
1836/*
1837 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1838 */
1839static int
1840nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
1841 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
1842 int tnamelen, struct ucred *cred, struct thread *td)
1843{
1844 struct nfsvattr fnfsva, tnfsva;
1845 struct nfsnode *fdnp = VTONFS(fdvp);
1846 struct nfsnode *tdnp = VTONFS(tdvp);
1847 int error = 0, fattrflag, tattrflag;
1848
1849 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
1850 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
1851 &tattrflag, NULL, NULL);
1852 mtx_lock(&fdnp->n_mtx);
1853 fdnp->n_flag |= NMODIFIED;
1854 if (fattrflag != 0) {
1855 mtx_unlock(&fdnp->n_mtx);
1856 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
1857 } else {
1858 fdnp->n_attrstamp = 0;
1859 mtx_unlock(&fdnp->n_mtx);
1860 }
1861 mtx_lock(&tdnp->n_mtx);
1862 tdnp->n_flag |= NMODIFIED;
1863 if (tattrflag != 0) {
1864 mtx_unlock(&tdnp->n_mtx);
1865 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
1866 } else {
1867 tdnp->n_attrstamp = 0;
1868 mtx_unlock(&tdnp->n_mtx);
1869 }
1870 if (error && NFS_ISV4(fdvp))
1871 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1872 return (error);
1873}
1874
1875/*
1876 * nfs hard link create call
1877 */
1878static int
1879nfs_link(struct vop_link_args *ap)
1880{
1881 struct vnode *vp = ap->a_vp;
1882 struct vnode *tdvp = ap->a_tdvp;
1883 struct componentname *cnp = ap->a_cnp;
1884 struct nfsnode *np, *tdnp;
1885 struct nfsvattr nfsva, dnfsva;
1886 int error = 0, attrflag, dattrflag;
1887
1888 if (vp->v_mount != tdvp->v_mount) {
1889 return (EXDEV);
1890 }
1891
1892 /*
1893 * Push all writes to the server, so that the attribute cache
1894 * doesn't get "out of sync" with the server.
1895 * XXX There should be a better way!
1896 */
1897 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1898
1899 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
1900 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
1901 &dattrflag, NULL);
1902 tdnp = VTONFS(tdvp);
1903 mtx_lock(&tdnp->n_mtx);
1904 tdnp->n_flag |= NMODIFIED;
1905 if (dattrflag != 0) {
1906 mtx_unlock(&tdnp->n_mtx);
1907 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
1908 } else {
1909 tdnp->n_attrstamp = 0;
1910 mtx_unlock(&tdnp->n_mtx);
1911 }
1912 if (attrflag)
1913 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1914 else {
1915 np = VTONFS(vp);
1916 mtx_lock(&np->n_mtx);
1917 np->n_attrstamp = 0;
1918 mtx_unlock(&np->n_mtx);
1919 }
1920 /*
1921 * If negative lookup caching is enabled, I might as well
1922 * add an entry for this node. Not necessary for correctness,
1923 * but if negative caching is enabled, then the system
1924 * must care about lookup caching hit rate, so...
1925 */
1926 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
1927 (cnp->cn_flags & MAKEENTRY))
1928 cache_enter(tdvp, vp, cnp);
1929 if (error && NFS_ISV4(vp))
1930 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
1931 (gid_t)0);
1932 return (error);
1933}
1934
1935/*
1936 * nfs symbolic link create call
1937 */
1938static int
1939nfs_symlink(struct vop_symlink_args *ap)
1940{
1941 struct vnode *dvp = ap->a_dvp;
1942 struct vattr *vap = ap->a_vap;
1943 struct componentname *cnp = ap->a_cnp;
1944 struct nfsvattr nfsva, dnfsva;
1945 struct nfsfh *nfhp;
1946 struct nfsnode *np = NULL, *dnp;
1947 struct vnode *newvp = NULL;
1948 int error = 0, attrflag, dattrflag, ret;
1949
1950 vap->va_type = VLNK;
1951 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1952 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1953 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1954 if (nfhp) {
1955 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
1956 &np, NULL, LK_EXCLUSIVE);
1957 if (!ret)
1958 newvp = NFSTOV(np);
1959 else if (!error)
1960 error = ret;
1961 }
1962 if (newvp != NULL) {
1963 if (attrflag)
1964 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1965 0, 1);
1966 } else if (!error) {
1967 /*
1968 * If we do not have an error and we could not extract the
1969 * newvp from the response due to the request being NFSv2, we
1970 * have to do a lookup in order to obtain a newvp to return.
1971 */
1972 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1973 cnp->cn_cred, cnp->cn_thread, &np);
1974 if (!error)
1975 newvp = NFSTOV(np);
1976 }
1977 if (error) {
1978 if (newvp)
1979 vput(newvp);
1980 if (NFS_ISV4(dvp))
1981 error = nfscl_maperr(cnp->cn_thread, error,
1982 vap->va_uid, vap->va_gid);
1983 } else {
1984 /*
1985 * If negative lookup caching is enabled, I might as well
1986 * add an entry for this node. Not necessary for correctness,
1987 * but if negative caching is enabled, then the system
1988 * must care about lookup caching hit rate, so...
1989 */
1990 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
1991 (cnp->cn_flags & MAKEENTRY))
1992 cache_enter(dvp, newvp, cnp);
1993 *ap->a_vpp = newvp;
1994 }
1995
1996 dnp = VTONFS(dvp);
1997 mtx_lock(&dnp->n_mtx);
1998 dnp->n_flag |= NMODIFIED;
1999 if (dattrflag != 0) {
2000 mtx_unlock(&dnp->n_mtx);
2001 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2002 } else {
2003 dnp->n_attrstamp = 0;
2004 mtx_unlock(&dnp->n_mtx);
2005 }
2006 return (error);
2007}
2008
2009/*
2010 * nfs make dir call
2011 */
2012static int
2013nfs_mkdir(struct vop_mkdir_args *ap)
2014{
2015 struct vnode *dvp = ap->a_dvp;
2016 struct vattr *vap = ap->a_vap;
2017 struct componentname *cnp = ap->a_cnp;
2018 struct nfsnode *np = NULL, *dnp;
2019 struct vnode *newvp = NULL;
2020 struct vattr vattr;
2021 struct nfsfh *nfhp;
2022 struct nfsvattr nfsva, dnfsva;
2023 int error = 0, attrflag, dattrflag, ret;
2024
2025 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2026 return (error);
2027 vap->va_type = VDIR;
2028 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2029 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2030 &attrflag, &dattrflag, NULL);
2031 dnp = VTONFS(dvp);
2032 mtx_lock(&dnp->n_mtx);
2033 dnp->n_flag |= NMODIFIED;
2034 if (dattrflag != 0) {
2035 mtx_unlock(&dnp->n_mtx);
2036 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2037 } else {
2038 dnp->n_attrstamp = 0;
2039 mtx_unlock(&dnp->n_mtx);
2040 }
2041 if (nfhp) {
2042 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2043 &np, NULL, LK_EXCLUSIVE);
2044 if (!ret) {
2045 newvp = NFSTOV(np);
2046 if (attrflag)
2047 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2048 NULL, 0, 1);
2049 } else if (!error)
2050 error = ret;
2051 }
2052 if (!error && newvp == NULL) {
2053 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2054 cnp->cn_cred, cnp->cn_thread, &np);
2055 if (!error) {
2056 newvp = NFSTOV(np);
2057 if (newvp->v_type != VDIR)
2058 error = EEXIST;
2059 }
2060 }
2061 if (error) {
2062 if (newvp)
2063 vput(newvp);
2064 if (NFS_ISV4(dvp))
2065 error = nfscl_maperr(cnp->cn_thread, error,
2066 vap->va_uid, vap->va_gid);
2067 } else {
2068 /*
2069 * If negative lookup caching is enabled, I might as well
2070 * add an entry for this node. Not necessary for correctness,
2071 * but if negative caching is enabled, then the system
2072 * must care about lookup caching hit rate, so...
2073 */
2074 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2075 (cnp->cn_flags & MAKEENTRY))
2076 cache_enter(dvp, newvp, cnp);
2077 *ap->a_vpp = newvp;
2078 }
2079 return (error);
2080}
2081
2082/*
2083 * nfs remove directory call
2084 */
2085static int
2086nfs_rmdir(struct vop_rmdir_args *ap)
2087{
2088 struct vnode *vp = ap->a_vp;
2089 struct vnode *dvp = ap->a_dvp;
2090 struct componentname *cnp = ap->a_cnp;
2091 struct nfsnode *dnp;
2092 struct nfsvattr dnfsva;
2093 int error, dattrflag;
2094
2095 if (dvp == vp)
2096 return (EINVAL);
2097 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2098 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2099 dnp = VTONFS(dvp);
2100 mtx_lock(&dnp->n_mtx);
2101 dnp->n_flag |= NMODIFIED;
2102 if (dattrflag != 0) {
2103 mtx_unlock(&dnp->n_mtx);
2104 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2105 } else {
2106 dnp->n_attrstamp = 0;
2107 mtx_unlock(&dnp->n_mtx);
2108 }
2109
2110 cache_purge(dvp);
2111 cache_purge(vp);
2112 if (error && NFS_ISV4(dvp))
2113 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2114 (gid_t)0);
2115 /*
2116 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2117 */
2118 if (error == ENOENT)
2119 error = 0;
2120 return (error);
2121}
2122
2123/*
2124 * nfs readdir call
2125 */
2126static int
2127nfs_readdir(struct vop_readdir_args *ap)
2128{
2129 struct vnode *vp = ap->a_vp;
2130 struct nfsnode *np = VTONFS(vp);
2131 struct uio *uio = ap->a_uio;
2132 int tresid, error = 0;
2133 struct vattr vattr;
2134
2135 if (vp->v_type != VDIR)
2136 return(EPERM);
2137
2138 /*
2139 * First, check for hit on the EOF offset cache
2140 */
2141 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2142 (np->n_flag & NMODIFIED) == 0) {
2143 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2144 mtx_lock(&np->n_mtx);
2145 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2146 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2147 mtx_unlock(&np->n_mtx);
2148 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
2149 return (0);
2150 } else
2151 mtx_unlock(&np->n_mtx);
2152 }
2153 }
2154
2155 /*
2156 * Call ncl_bioread() to do the real work.
2157 */
2158 tresid = uio->uio_resid;
2159 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2160
2161 if (!error && uio->uio_resid == tresid)
2162 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
2163 return (error);
2164}
2165
2166/*
2167 * Readdir rpc call.
2168 * Called from below the buffer cache by ncl_doio().
2169 */
2170int
2171ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2172 struct thread *td)
2173{
2174 struct nfsvattr nfsva;
2175 nfsuint64 *cookiep, cookie;
2176 struct nfsnode *dnp = VTONFS(vp);
2177 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2178 int error = 0, eof, attrflag;
2179
2180 KASSERT(uiop->uio_iovcnt == 1 &&
2181 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2182 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2183 ("nfs readdirrpc bad uio"));
2184
2185 /*
2186 * If there is no cookie, assume directory was stale.
2187 */
2188 ncl_dircookie_lock(dnp);
2189 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2190 if (cookiep) {
2191 cookie = *cookiep;
2192 ncl_dircookie_unlock(dnp);
2193 } else {
2194 ncl_dircookie_unlock(dnp);
2195 return (NFSERR_BAD_COOKIE);
2196 }
2197
2198 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2199 (void)ncl_fsinfo(nmp, vp, cred, td);
2200
2201 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2202 &attrflag, &eof, NULL);
2203 if (attrflag)
2204 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2205
2206 if (!error) {
2207 /*
2208 * We are now either at the end of the directory or have filled
2209 * the block.
2210 */
2211 if (eof)
2212 dnp->n_direofoffset = uiop->uio_offset;
2213 else {
2214 if (uiop->uio_resid > 0)
2215 ncl_printf("EEK! readdirrpc resid > 0\n");
2216 ncl_dircookie_lock(dnp);
2217 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2218 *cookiep = cookie;
2219 ncl_dircookie_unlock(dnp);
2220 }
2221 } else if (NFS_ISV4(vp)) {
2222 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2223 }
2224 return (error);
2225}
2226
2227/*
2228 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2229 */
2230int
2231ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2232 struct thread *td)
2233{
2234 struct nfsvattr nfsva;
2235 nfsuint64 *cookiep, cookie;
2236 struct nfsnode *dnp = VTONFS(vp);
2237 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2238 int error = 0, attrflag, eof;
2239
2240 KASSERT(uiop->uio_iovcnt == 1 &&
2241 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2242 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2243 ("nfs readdirplusrpc bad uio"));
2244
2245 /*
2246 * If there is no cookie, assume directory was stale.
2247 */
2248 ncl_dircookie_lock(dnp);
2249 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2250 if (cookiep) {
2251 cookie = *cookiep;
2252 ncl_dircookie_unlock(dnp);
2253 } else {
2254 ncl_dircookie_unlock(dnp);
2255 return (NFSERR_BAD_COOKIE);
2256 }
2257
2258 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2259 (void)ncl_fsinfo(nmp, vp, cred, td);
2260 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2261 &attrflag, &eof, NULL);
2262 if (attrflag)
2263 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2264
2265 if (!error) {
2266 /*
2267 * We are now either at end of the directory or have filled the
2268 * the block.
2269 */
2270 if (eof)
2271 dnp->n_direofoffset = uiop->uio_offset;
2272 else {
2273 if (uiop->uio_resid > 0)
2274 ncl_printf("EEK! readdirplusrpc resid > 0\n");
2275 ncl_dircookie_lock(dnp);
2276 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2277 *cookiep = cookie;
2278 ncl_dircookie_unlock(dnp);
2279 }
2280 } else if (NFS_ISV4(vp)) {
2281 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2282 }
2283 return (error);
2284}
2285
2286/*
2287 * Silly rename. To make the NFS filesystem that is stateless look a little
2288 * more like the "ufs" a remove of an active vnode is translated to a rename
2289 * to a funny looking filename that is removed by nfs_inactive on the
2290 * nfsnode. There is the potential for another process on a different client
2291 * to create the same funny name between the nfs_lookitup() fails and the
2292 * nfs_rename() completes, but...
2293 */
2294static int
2295nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2296{
2297 struct sillyrename *sp;
2298 struct nfsnode *np;
2299 int error;
2300 short pid;
2301 unsigned int lticks;
2302
2303 cache_purge(dvp);
2304 np = VTONFS(vp);
2305 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2306 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2307 M_NEWNFSREQ, M_WAITOK);
2308 sp->s_cred = crhold(cnp->cn_cred);
2309 sp->s_dvp = dvp;
2310 VREF(dvp);
2311
2312 /*
2313 * Fudge together a funny name.
2314 * Changing the format of the funny name to accomodate more
2315 * sillynames per directory.
2316 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2317 * CPU ticks since boot.
2318 */
2319 pid = cnp->cn_thread->td_proc->p_pid;
2320 lticks = (unsigned int)ticks;
2321 for ( ; ; ) {
2322 sp->s_namlen = sprintf(sp->s_name,
2323 ".nfs.%08x.%04x4.4", lticks,
2324 pid);
2325 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2326 cnp->cn_thread, NULL))
2327 break;
2328 lticks++;
2329 }
2330 error = nfs_renameit(dvp, vp, cnp, sp);
2331 if (error)
2332 goto bad;
2333 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2334 cnp->cn_thread, &np);
2335 np->n_sillyrename = sp;
2336 return (0);
2337bad:
2338 vrele(sp->s_dvp);
2339 crfree(sp->s_cred);
2340 free((caddr_t)sp, M_NEWNFSREQ);
2341 return (error);
2342}
2343
2344/*
2345 * Look up a file name and optionally either update the file handle or
2346 * allocate an nfsnode, depending on the value of npp.
2347 * npp == NULL --> just do the lookup
2348 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2349 * handled too
2350 * *npp != NULL --> update the file handle in the vnode
2351 */
2352static int
2353nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2354 struct thread *td, struct nfsnode **npp)
2355{
2356 struct vnode *newvp = NULL, *vp;
2357 struct nfsnode *np, *dnp = VTONFS(dvp);
2358 struct nfsfh *nfhp, *onfhp;
2359 struct nfsvattr nfsva, dnfsva;
2360 struct componentname cn;
2361 int error = 0, attrflag, dattrflag;
2362 u_int hash;
2363
2364 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2365 &nfhp, &attrflag, &dattrflag, NULL);
2366 if (dattrflag)
2367 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2368 if (npp && !error) {
2369 if (*npp != NULL) {
2370 np = *npp;
2371 vp = NFSTOV(np);
2372 /*
2373 * For NFSv4, check to see if it is the same name and
2374 * replace the name, if it is different.
2375 */
2376 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2377 (np->n_v4->n4_namelen != len ||
2378 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2379 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2380 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2381 dnp->n_fhp->nfh_len))) {
2382#ifdef notdef
2383{ char nnn[100]; int nnnl;
2384nnnl = (len < 100) ? len : 99;
2385bcopy(name, nnn, nnnl);
2386nnn[nnnl] = '\0';
2387printf("replace=%s\n",nnn);
2388}
2389#endif
2390 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
2391 MALLOC(np->n_v4, struct nfsv4node *,
2392 sizeof (struct nfsv4node) +
2393 dnp->n_fhp->nfh_len + len - 1,
2394 M_NFSV4NODE, M_WAITOK);
2395 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2396 np->n_v4->n4_namelen = len;
2397 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2398 dnp->n_fhp->nfh_len);
2399 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2400 }
2401 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2402 FNV1_32_INIT);
2403 onfhp = np->n_fhp;
2404 /*
2405 * Rehash node for new file handle.
2406 */
2407 vfs_hash_rehash(vp, hash);
2408 np->n_fhp = nfhp;
2409 if (onfhp != NULL)
2410 FREE((caddr_t)onfhp, M_NFSFH);
2411 newvp = NFSTOV(np);
2412 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2413 FREE((caddr_t)nfhp, M_NFSFH);
2414 VREF(dvp);
2415 newvp = dvp;
2416 } else {
2417 cn.cn_nameptr = name;
2418 cn.cn_namelen = len;
2419 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2420 &np, NULL, LK_EXCLUSIVE);
2421 if (error)
2422 return (error);
2423 newvp = NFSTOV(np);
2424 }
2425 if (!attrflag && *npp == NULL) {
2426 if (newvp == dvp)
2427 vrele(newvp);
2428 else
2429 vput(newvp);
2430 return (ENOENT);
2431 }
2432 if (attrflag)
2433 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2434 0, 1);
2435 }
2436 if (npp && *npp == NULL) {
2437 if (error) {
2438 if (newvp) {
2439 if (newvp == dvp)
2440 vrele(newvp);
2441 else
2442 vput(newvp);
2443 }
2444 } else
2445 *npp = np;
2446 }
2447 if (error && NFS_ISV4(dvp))
2448 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2449 return (error);
2450}
2451
2452/*
2453 * Nfs Version 3 and 4 commit rpc
2454 */
2455int
2456ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2457 struct thread *td)
2458{
2459 struct nfsvattr nfsva;
2460 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2461 int error, attrflag;
2462 u_char verf[NFSX_VERF];
2463
2464 mtx_lock(&nmp->nm_mtx);
2465 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2466 mtx_unlock(&nmp->nm_mtx);
2467 return (0);
2468 }
2469 mtx_unlock(&nmp->nm_mtx);
2470 error = nfsrpc_commit(vp, offset, cnt, cred, td, verf, &nfsva,
2471 &attrflag, NULL);
2472 if (!error) {
2473 mtx_lock(&nmp->nm_mtx);
2474 if (NFSBCMP((caddr_t)nmp->nm_verf, verf, NFSX_VERF)) {
2475 NFSBCOPY(verf, (caddr_t)nmp->nm_verf, NFSX_VERF);
2476 error = NFSERR_STALEWRITEVERF;
2477 }
2478 mtx_unlock(&nmp->nm_mtx);
2479 if (!error && attrflag)
2480 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2481 0, 1);
2482 } else if (NFS_ISV4(vp)) {
2483 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2484 }
2485 return (error);
2486}
2487
2488/*
2489 * Strategy routine.
2490 * For async requests when nfsiod(s) are running, queue the request by
2491 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2492 * request.
2493 */
2494static int
2495nfs_strategy(struct vop_strategy_args *ap)
2496{
2497 struct buf *bp = ap->a_bp;
2498 struct ucred *cr;
2499
2500 KASSERT(!(bp->b_flags & B_DONE),
2501 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2502 BUF_ASSERT_HELD(bp);
2503
2504 if (bp->b_iocmd == BIO_READ)
2505 cr = bp->b_rcred;
2506 else
2507 cr = bp->b_wcred;
2508
2509 /*
2510 * If the op is asynchronous and an i/o daemon is waiting
2511 * queue the request, wake it up and wait for completion
2512 * otherwise just do it ourselves.
2513 */
2514 if ((bp->b_flags & B_ASYNC) == 0 ||
2515 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2516 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
2517 return (0);
2518}
2519
2520/*
2521 * fsync vnode op. Just call ncl_flush() with commit == 1.
2522 */
2523/* ARGSUSED */
2524static int
2525nfs_fsync(struct vop_fsync_args *ap)
2526{
2527 return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
2528}
2529
2530/*
2531 * Flush all the blocks associated with a vnode.
2532 * Walk through the buffer pool and push any dirty pages
2533 * associated with the vnode.
2534 * If the called_from_renewthread argument is TRUE, it has been called
2535 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2536 * waiting for a buffer write to complete.
2537 */
2538int
2539ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
2540 int commit, int called_from_renewthread)
2541{
2542 struct nfsnode *np = VTONFS(vp);
2543 struct buf *bp;
2544 int i;
2545 struct buf *nbp;
2546 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2547 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2548 int passone = 1, trycnt = 0;
2549 u_quad_t off, endoff, toff;
2550 struct ucred* wcred = NULL;
2551 struct buf **bvec = NULL;
2552 struct bufobj *bo;
2553#ifndef NFS_COMMITBVECSIZ
2554#define NFS_COMMITBVECSIZ 20
2555#endif
2556 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2557 int bvecsize = 0, bveccount;
2558
2559 if (called_from_renewthread != 0)
2560 slptimeo = hz;
2561 if (nmp->nm_flag & NFSMNT_INT)
2562 slpflag = NFS_PCATCH;
2563 if (!commit)
2564 passone = 0;
2565 bo = &vp->v_bufobj;
2566 /*
2567 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2568 * server, but has not been committed to stable storage on the server
2569 * yet. On the first pass, the byte range is worked out and the commit
2570 * rpc is done. On the second pass, ncl_writebp() is called to do the
2571 * job.
2572 */
2573again:
2574 off = (u_quad_t)-1;
2575 endoff = 0;
2576 bvecpos = 0;
2577 if (NFS_ISV34(vp) && commit) {
2578 if (bvec != NULL && bvec != bvec_on_stack)
2579 free(bvec, M_TEMP);
2580 /*
2581 * Count up how many buffers waiting for a commit.
2582 */
2583 bveccount = 0;
2584 BO_LOCK(bo);
2585 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2586 if (!BUF_ISLOCKED(bp) &&
2587 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2588 == (B_DELWRI | B_NEEDCOMMIT))
2589 bveccount++;
2590 }
2591 /*
2592 * Allocate space to remember the list of bufs to commit. It is
2593 * important to use M_NOWAIT here to avoid a race with nfs_write.
2594 * If we can't get memory (for whatever reason), we will end up
2595 * committing the buffers one-by-one in the loop below.
2596 */
2597 if (bveccount > NFS_COMMITBVECSIZ) {
2598 /*
2599 * Release the vnode interlock to avoid a lock
2600 * order reversal.
2601 */
2602 BO_UNLOCK(bo);
2603 bvec = (struct buf **)
2604 malloc(bveccount * sizeof(struct buf *),
2605 M_TEMP, M_NOWAIT);
2606 BO_LOCK(bo);
2607 if (bvec == NULL) {
2608 bvec = bvec_on_stack;
2609 bvecsize = NFS_COMMITBVECSIZ;
2610 } else
2611 bvecsize = bveccount;
2612 } else {
2613 bvec = bvec_on_stack;
2614 bvecsize = NFS_COMMITBVECSIZ;
2615 }
2616 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2617 if (bvecpos >= bvecsize)
2618 break;
2619 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2620 nbp = TAILQ_NEXT(bp, b_bobufs);
2621 continue;
2622 }
2623 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2624 (B_DELWRI | B_NEEDCOMMIT)) {
2625 BUF_UNLOCK(bp);
2626 nbp = TAILQ_NEXT(bp, b_bobufs);
2627 continue;
2628 }
2629 BO_UNLOCK(bo);
2630 bremfree(bp);
2631 /*
2632 * Work out if all buffers are using the same cred
2633 * so we can deal with them all with one commit.
2634 *
2635 * NOTE: we are not clearing B_DONE here, so we have
2636 * to do it later on in this routine if we intend to
2637 * initiate I/O on the bp.
2638 *
2639 * Note: to avoid loopback deadlocks, we do not
2640 * assign b_runningbufspace.
2641 */
2642 if (wcred == NULL)
2643 wcred = bp->b_wcred;
2644 else if (wcred != bp->b_wcred)
2645 wcred = NOCRED;
2646 vfs_busy_pages(bp, 1);
2647
2648 BO_LOCK(bo);
2649 /*
2650 * bp is protected by being locked, but nbp is not
2651 * and vfs_busy_pages() may sleep. We have to
2652 * recalculate nbp.
2653 */
2654 nbp = TAILQ_NEXT(bp, b_bobufs);
2655
2656 /*
2657 * A list of these buffers is kept so that the
2658 * second loop knows which buffers have actually
2659 * been committed. This is necessary, since there
2660 * may be a race between the commit rpc and new
2661 * uncommitted writes on the file.
2662 */
2663 bvec[bvecpos++] = bp;
2664 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2665 bp->b_dirtyoff;
2666 if (toff < off)
2667 off = toff;
2668 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2669 if (toff > endoff)
2670 endoff = toff;
2671 }
2672 BO_UNLOCK(bo);
2673 }
2674 if (bvecpos > 0) {
2675 /*
2676 * Commit data on the server, as required.
2677 * If all bufs are using the same wcred, then use that with
2678 * one call for all of them, otherwise commit each one
2679 * separately.
2680 */
2681 if (wcred != NOCRED)
2682 retv = ncl_commit(vp, off, (int)(endoff - off),
2683 wcred, td);
2684 else {
2685 retv = 0;
2686 for (i = 0; i < bvecpos; i++) {
2687 off_t off, size;
2688 bp = bvec[i];
2689 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2690 bp->b_dirtyoff;
2691 size = (u_quad_t)(bp->b_dirtyend
2692 - bp->b_dirtyoff);
2693 retv = ncl_commit(vp, off, (int)size,
2694 bp->b_wcred, td);
2695 if (retv) break;
2696 }
2697 }
2698
2699 if (retv == NFSERR_STALEWRITEVERF)
2700 ncl_clearcommit(vp->v_mount);
2701
2702 /*
2703 * Now, either mark the blocks I/O done or mark the
2704 * blocks dirty, depending on whether the commit
2705 * succeeded.
2706 */
2707 for (i = 0; i < bvecpos; i++) {
2708 bp = bvec[i];
2709 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2710 if (retv) {
2711 /*
2712 * Error, leave B_DELWRI intact
2713 */
2714 vfs_unbusy_pages(bp);
2715 brelse(bp);
2716 } else {
2717 /*
2718 * Success, remove B_DELWRI ( bundirty() ).
2719 *
2720 * b_dirtyoff/b_dirtyend seem to be NFS
2721 * specific. We should probably move that
2722 * into bundirty(). XXX
2723 */
2724 bufobj_wref(bo);
2725 bp->b_flags |= B_ASYNC;
2726 bundirty(bp);
2727 bp->b_flags &= ~B_DONE;
2728 bp->b_ioflags &= ~BIO_ERROR;
2729 bp->b_dirtyoff = bp->b_dirtyend = 0;
2730 bufdone(bp);
2731 }
2732 }
2733 }
2734
2735 /*
2736 * Start/do any write(s) that are required.
2737 */
2738loop:
2739 BO_LOCK(bo);
2740 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2741 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2742 if (waitfor != MNT_WAIT || passone)
2743 continue;
2744
2745 error = BUF_TIMELOCK(bp,
2746 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2747 BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
2748 if (error == 0) {
2749 BUF_UNLOCK(bp);
2750 goto loop;
2751 }
2752 if (error == ENOLCK) {
2753 error = 0;
2754 goto loop;
2755 }
2756 if (called_from_renewthread != 0) {
2757 /*
2758 * Return EIO so the flush will be retried
2759 * later.
2760 */
2761 error = EIO;
2762 goto done;
2763 }
2764 if (newnfs_sigintr(nmp, td)) {
2765 error = EINTR;
2766 goto done;
2767 }
2768 if (slpflag & PCATCH) {
2769 slpflag = 0;
2770 slptimeo = 2 * hz;
2771 }
2772 goto loop;
2773 }
2774 if ((bp->b_flags & B_DELWRI) == 0)
2775 panic("nfs_fsync: not dirty");
2776 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2777 BUF_UNLOCK(bp);
2778 continue;
2779 }
2780 BO_UNLOCK(bo);
2781 bremfree(bp);
2782 if (passone || !commit)
2783 bp->b_flags |= B_ASYNC;
2784 else
2785 bp->b_flags |= B_ASYNC;
2786 bwrite(bp);
2787 if (newnfs_sigintr(nmp, td)) {
2788 error = EINTR;
2789 goto done;
2790 }
2791 goto loop;
2792 }
2793 if (passone) {
2794 passone = 0;
2795 BO_UNLOCK(bo);
2796 goto again;
2797 }
2798 if (waitfor == MNT_WAIT) {
2799 while (bo->bo_numoutput) {
2800 error = bufobj_wwait(bo, slpflag, slptimeo);
2801 if (error) {
2802 BO_UNLOCK(bo);
2803 if (called_from_renewthread != 0) {
2804 /*
2805 * Return EIO so that the flush will be
2806 * retried later.
2807 */
2808 error = EIO;
2809 goto done;
2810 }
2811 error = newnfs_sigintr(nmp, td);
2812 if (error)
2813 goto done;
2814 if (slpflag & PCATCH) {
2815 slpflag = 0;
2816 slptimeo = 2 * hz;
2817 }
2818 BO_LOCK(bo);
2819 }
2820 }
2821 if (bo->bo_dirty.bv_cnt != 0 && commit) {
2822 BO_UNLOCK(bo);
2823 goto loop;
2824 }
2825 /*
2826 * Wait for all the async IO requests to drain
2827 */
2828 BO_UNLOCK(bo);
2829 mtx_lock(&np->n_mtx);
2830 while (np->n_directio_asyncwr > 0) {
2831 np->n_flag |= NFSYNCWAIT;
2832 error = newnfs_msleep(td, &np->n_directio_asyncwr,
2833 &np->n_mtx, slpflag | (PRIBIO + 1),
2834 "nfsfsync", 0);
2835 if (error) {
2836 if (newnfs_sigintr(nmp, td)) {
2837 mtx_unlock(&np->n_mtx);
2838 error = EINTR;
2839 goto done;
2840 }
2841 }
2842 }
2843 mtx_unlock(&np->n_mtx);
2844 } else
2845 BO_UNLOCK(bo);
2846 mtx_lock(&np->n_mtx);
2847 if (np->n_flag & NWRITEERR) {
2848 error = np->n_error;
2849 np->n_flag &= ~NWRITEERR;
2850 }
2851 if (commit && bo->bo_dirty.bv_cnt == 0 &&
2852 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
2853 np->n_flag &= ~NMODIFIED;
2854 mtx_unlock(&np->n_mtx);
2855done:
2856 if (bvec != NULL && bvec != bvec_on_stack)
2857 free(bvec, M_TEMP);
2858 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
2859 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
2860 np->n_directio_asyncwr != 0) && trycnt++ < 5) {
2861 /* try, try again... */
2862 passone = 1;
2863 wcred = NULL;
2864 bvec = NULL;
2865 bvecsize = 0;
2866printf("try%d\n", trycnt);
2867 goto again;
2868 }
2869 return (error);
2870}
2871
2872/*
2873 * NFS advisory byte-level locks.
2874 */
2875static int
2876nfs_advlock(struct vop_advlock_args *ap)
2877{
2878 struct vnode *vp = ap->a_vp;
2879 struct ucred *cred;
2880 struct nfsnode *np = VTONFS(ap->a_vp);
2881 struct proc *p = (struct proc *)ap->a_id;
2882 struct thread *td = curthread; /* XXX */
2883 struct vattr va;
2884 int ret, error = EOPNOTSUPP;
2885 u_quad_t size;
2886
2887 if (NFS_ISV4(vp) && (ap->a_flags & F_POSIX)) {
2888 cred = p->p_ucred;
2889 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2890 if (vp->v_iflag & VI_DOOMED) {
2891 VOP_UNLOCK(vp, 0);
2892 return (EBADF);
2893 }
2894
2895 /*
2896 * If this is unlocking a write locked region, flush and
2897 * commit them before unlocking. This is required by
2898 * RFC3530 Sec. 9.3.2.
2899 */
2900 if (ap->a_op == F_UNLCK &&
|