2 * Copyright (c) 2000-2001, Boris Popov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/sys/fs/smbfs/smbfs_io.c,v 1.3.2.3 2003/01/17 08:20:26 tjr Exp $
33 * $DragonFly: src/sys/vfs/smbfs/smbfs_io.c,v 1.29 2007/08/28 01:04:33 dillon Exp $
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */
39 #include <sys/kernel.h>
41 #include <sys/fcntl.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/vnode.h>
45 #include <sys/dirent.h>
46 #include <sys/signalvar.h>
47 #include <sys/sysctl.h>
49 #include <machine/limits.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_extern.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_pager.h>
56 #include <vm/vnode_pager.h>
58 #include <netproto/smb/smb.h>
59 #include <netproto/smb/smb_conn.h>
60 #include <netproto/smb/smb_subr.h>
63 #include "smbfs_node.h"
64 #include "smbfs_subr.h"
68 #include <sys/thread2.h>
70 /*#define SMBFS_RWGENERIC*/
72 extern int smbfs_pbuf_freecnt;
74 static int smbfs_fastlookup = 1;
76 SYSCTL_DECL(_vfs_smbfs);
77 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
80 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
82 struct smb_cred scred;
83 struct smbfs_fctx *ctx;
86 int error, offset, retval/*, *eofflag = ap->a_eofflag*/;
89 SMBVDEBUG("dirname='%s'\n", np->n_name);
90 smb_makescred(&scred, uio->uio_td, cred);
92 if (uio->uio_resid < 0 || uio->uio_offset < 0 ||
93 uio->uio_offset > INT_MAX)
97 offset = uio->uio_offset;
99 if (uio->uio_resid > 0 && offset < 1) {
100 if (vop_write_dirent(&error, uio, np->n_ino, DT_DIR, 1, "."))
107 if (uio->uio_resid > 0 && offset < 2) {
108 if (vop_write_dirent(&error, uio,
109 np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2,
117 if (uio->uio_resid == 0)
120 if (offset != np->n_dirofs || np->n_dirseq == NULL) {
121 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
123 smbfs_findclose(np->n_dirseq, &scred);
127 error = smbfs_findopen(np, "*", 1,
128 SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
131 SMBVDEBUG("can not open search, error = %d", error);
138 while (np->n_dirofs < offset) {
139 error = smbfs_findnext(ctx, offset - np->n_dirofs, &scred);
142 smbfs_findclose(np->n_dirseq, &scred);
144 return error == ENOENT ? 0 : error;
148 while (uio->uio_resid > 0 && !error) {
150 * Overestimate the size of a record a bit, doesn't really
151 * hurt to be wrong here.
153 error = smbfs_findnext(ctx, uio->uio_resid / _DIRENT_RECLEN(255) + 1, &scred);
159 retval = vop_write_dirent(&error, uio, ctx->f_attr.fa_ino,
160 (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG,
161 ctx->f_nmlen, ctx->f_name);
164 if (smbfs_fastlookup && !error) {
165 error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
166 ctx->f_nmlen, &ctx->f_attr, &newvp);
174 uio->uio_offset = offset;
179 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
182 struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
183 struct smbnode *np = VTOSMB(vp);
185 struct smb_cred scred;
189 * Protect against method which is not supported for now
191 if (uiop->uio_segflg == UIO_NOCOPY)
194 if (vp->v_type != VREG && vp->v_type != VDIR) {
195 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
198 if (uiop->uio_resid == 0)
200 if (uiop->uio_offset < 0)
202 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
205 if (vp->v_type == VDIR) {
206 lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, td);*/
207 if (lks == LK_SHARED)
208 vn_lock(vp, LK_UPGRADE | LK_RETRY);
209 error = smbfs_readvdir(vp, uiop, cred);
210 if (lks == LK_SHARED)
211 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
215 /* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
216 if (np->n_flag & NMODIFIED) {
217 smbfs_attr_cacheremove(vp);
218 error = VOP_GETATTR(vp, &vattr);
221 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
223 error = VOP_GETATTR(vp, &vattr);
226 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
227 error = smbfs_vinvalbuf(vp, V_SAVE, 1);
230 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
233 smb_makescred(&scred, td, cred);
234 return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
238 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
239 struct ucred *cred, int ioflag)
242 struct smbmount *smp = VTOSMBFS(vp);
243 struct smbnode *np = VTOSMB(vp);
244 struct smb_cred scred;
247 if (vp->v_type != VREG) {
248 SMBERROR("vn types other than VREG unsupported !\n");
251 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
252 if (uiop->uio_offset < 0)
254 /* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
257 if (ioflag & (IO_APPEND | IO_SYNC)) {
258 if (np->n_flag & NMODIFIED) {
259 smbfs_attr_cacheremove(vp);
260 error = smbfs_vinvalbuf(vp, V_SAVE, 1);
264 if (ioflag & IO_APPEND) {
267 * File size can be changed by another client
269 smbfs_attr_cacheremove(vp);
270 error = VOP_GETATTR(vp, &vattr);
271 if (error) return (error);
273 uiop->uio_offset = np->n_size;
276 if (uiop->uio_resid == 0)
279 uiop->uio_offset + uiop->uio_resid >
280 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
281 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
284 smb_makescred(&scred, td, cred);
285 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
286 SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
288 if (uiop->uio_offset > np->n_size) {
289 np->n_size = uiop->uio_offset;
290 vnode_pager_setsize(vp, np->n_size);
297 * Do an I/O operation to/from a cache block.
300 smbfs_doio(struct vnode *vp, struct bio *bio, struct ucred *cr, struct thread *td)
302 struct buf *bp = bio->bio_buf;
303 struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
304 struct smbnode *np = VTOSMB(vp);
305 struct uio uio, *uiop = &uio;
307 struct smb_cred scred;
311 uiop->uio_iovcnt = 1;
312 uiop->uio_segflg = UIO_SYSSPACE;
315 smb_makescred(&scred, td, cr);
317 if (bp->b_cmd == BUF_CMD_READ) {
318 io.iov_len = uiop->uio_resid = bp->b_bcount;
319 io.iov_base = bp->b_data;
320 uiop->uio_rw = UIO_READ;
321 switch (vp->v_type) {
323 uiop->uio_offset = bio->bio_offset;
324 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
327 if (uiop->uio_resid) {
328 int left = uiop->uio_resid;
329 int nread = bp->b_bcount - left;
331 bzero((char *)bp->b_data + nread, left);
335 kprintf("smbfs_doio: type %x unexpected\n",vp->v_type);
340 bp->b_flags |= B_ERROR;
343 KKASSERT(bp->b_cmd == BUF_CMD_WRITE);
344 if (bio->bio_offset + bp->b_dirtyend > np->n_size)
345 bp->b_dirtyend = np->n_size - bio->bio_offset;
347 if (bp->b_dirtyend > bp->b_dirtyoff) {
348 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
349 uiop->uio_offset = bio->bio_offset + bp->b_dirtyoff;
350 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
351 uiop->uio_rw = UIO_WRITE;
352 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
355 * For an interrupted write, the buffer is still valid
356 * and the write hasn't been pushed to the server yet,
357 * so we can't set BIO_ERROR and report the interruption
358 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
359 * is not relevant, so the rpc attempt is essentially
360 * a noop. For the case of a V3 write rpc not being
361 * committed to stable storage, the block is still
362 * dirty and requires either a commit rpc or another
363 * write rpc with iomode == NFSV3WRITE_FILESYNC before
364 * the block is reused. This is indicated by setting
365 * the B_DELWRI and B_NEEDCOMMIT flags.
368 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
371 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
372 if ((bp->b_flags & B_ASYNC) == 0)
373 bp->b_flags |= B_EINTR;
374 if ((bp->b_flags & B_PAGING) == 0)
376 if ((bp->b_flags & B_ASYNC) == 0)
377 bp->b_flags |= B_EINTR;
381 bp->b_flags |= B_ERROR;
384 bp->b_dirtyoff = bp->b_dirtyend = 0;
392 bp->b_resid = uiop->uio_resid;
398 * Vnode op for VM getpages.
399 * Wish wish .... get rid from multiple IO routines
401 * smbfs_getpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
402 * int a_reqpage, vm_ooffset_t a_offset)
405 smbfs_getpages(struct vop_getpages_args *ap)
407 #ifdef SMBFS_RWGENERIC
408 return vop_stdgetpages(ap);
410 int i, error, nextoff, size, toff, npages, count;
417 struct thread *td = curthread; /* XXX */
419 struct smbmount *smp;
421 struct smb_cred scred;
424 KKASSERT(td->td_proc);
427 cred = td->td_proc->p_ucred;
429 smp = VFSTOSMBFS(vp->v_mount);
433 if (vp->v_object == NULL) {
434 kprintf("smbfs_getpages: called with non-merged cache vnode??\n");
435 return VM_PAGER_ERROR;
437 smb_makescred(&scred, td, cred);
439 bp = getpbuf(&smbfs_pbuf_freecnt);
440 npages = btoc(count);
441 kva = (vm_offset_t) bp->b_data;
442 pmap_qenter(kva, pages, npages);
444 iov.iov_base = (caddr_t) kva;
448 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
449 uio.uio_resid = count;
450 uio.uio_segflg = UIO_SYSSPACE;
451 uio.uio_rw = UIO_READ;
455 * This is kinda nasty. Since smbfs is physically closing the
456 * fid on close(), we have to reopen it if necessary. There are
457 * other races here too, such as if another process opens the same
458 * file while we are blocked in read. XXX
462 if (np->n_opencount == 0) {
463 error = smbfs_smb_open(np, SMB_AM_OPENREAD, &scred);
468 error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
470 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
471 pmap_qremove(kva, npages);
473 relpbuf(bp, &smbfs_pbuf_freecnt);
475 if (error && (uio.uio_resid == count)) {
476 kprintf("smbfs_getpages: error %d\n",error);
477 for (i = 0; i < npages; i++) {
478 if (ap->a_reqpage != i)
479 vnode_pager_freepage(pages[i]);
481 return VM_PAGER_ERROR;
484 size = count - uio.uio_resid;
486 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
488 nextoff = toff + PAGE_SIZE;
491 m->flags &= ~PG_ZERO;
493 if (nextoff <= size) {
494 m->valid = VM_PAGE_BITS_ALL;
497 int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
498 vm_page_set_validclean(m, 0, nvalid);
501 if (i != ap->a_reqpage) {
503 * Whether or not to leave the page activated is up in
504 * the air, but we should put the page on a page queue
505 * somewhere (it already is in the object). Result:
506 * It appears that emperical results show that
507 * deactivating pages is best.
511 * Just in case someone was asking for this page we
512 * now tell them that it is ok to use.
515 if (m->flags & PG_WANTED)
518 vm_page_deactivate(m);
521 vnode_pager_freepage(m);
526 #endif /* SMBFS_RWGENERIC */
530 * Vnode op for VM putpages.
531 * possible bug: all IO done in sync mode
532 * Note that vop_close always invalidate pages before close, so it's
533 * not necessary to open vnode.
535 * smbfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count, int a_sync,
536 * int *a_rtvals, vm_ooffset_t a_offset)
539 smbfs_putpages(struct vop_putpages_args *ap)
542 struct vnode *vp = ap->a_vp;
543 struct thread *td = curthread; /* XXX */
546 #ifdef SMBFS_RWGENERIC
547 KKASSERT(td->td_proc);
548 cred = td->td_proc->p_ucred;
549 VOP_OPEN(vp, FWRITE, cred, NULL);
550 error = vop_stdputpages(ap);
551 VOP_CLOSE(vp, FWRITE, cred);
558 int i, npages, count;
561 struct smbmount *smp;
563 struct smb_cred scred;
566 KKASSERT(td->td_proc);
567 cred = td->td_proc->p_ucred;
568 /* VOP_OPEN(vp, FWRITE, cred, NULL);*/
570 smp = VFSTOSMBFS(vp->v_mount);
573 rtvals = ap->a_rtvals;
574 npages = btoc(count);
576 for (i = 0; i < npages; i++) {
577 rtvals[i] = VM_PAGER_AGAIN;
580 bp = getpbuf(&smbfs_pbuf_freecnt);
581 kva = (vm_offset_t) bp->b_data;
582 pmap_qenter(kva, pages, npages);
584 iov.iov_base = (caddr_t) kva;
588 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
589 uio.uio_resid = count;
590 uio.uio_segflg = UIO_SYSSPACE;
591 uio.uio_rw = UIO_WRITE;
593 SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
595 smb_makescred(&scred, td, cred);
598 * This is kinda nasty. Since smbfs is physically closing the
599 * fid on close(), we have to reopen it if necessary. There are
600 * other races here too, such as if another process opens the same
601 * file while we are blocked in read, or the file is open read-only
606 if (np->n_opencount == 0) {
607 error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
612 error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
614 smbfs_smb_close(smp->sm_share, np->n_fid, NULL, &scred);
615 /* VOP_CLOSE(vp, FWRITE, cred);*/
616 SMBVDEBUG("paged write done: %d\n", error);
618 pmap_qremove(kva, npages);
619 relpbuf(bp, &smbfs_pbuf_freecnt);
622 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
623 for (i = 0; i < nwritten; i++) {
624 rtvals[i] = VM_PAGER_OK;
629 #endif /* SMBFS_RWGENERIC */
633 * Flush and invalidate all dirty buffers. If another process is already
634 * doing the flush, just wait for completion.
637 smbfs_vinvalbuf(struct vnode *vp, int flags, int intrflg)
639 struct smbnode *np = VTOSMB(vp);
640 int error = 0, slpflag, slptimeo;
642 if (vp->v_flag & VRECLAIMED)
651 while (np->n_flag & NFLUSHINPROG) {
652 np->n_flag |= NFLUSHWANT;
653 error = tsleep((caddr_t)&np->n_flag, 0, "smfsvinv", slptimeo);
654 error = smb_proc_intr(curthread);
655 if (error == EINTR && intrflg)
658 np->n_flag |= NFLUSHINPROG;
659 error = vinvalbuf(vp, flags, slpflag, 0);
661 if (intrflg && (error == ERESTART || error == EINTR)) {
662 np->n_flag &= ~NFLUSHINPROG;
663 if (np->n_flag & NFLUSHWANT) {
664 np->n_flag &= ~NFLUSHWANT;
665 wakeup((caddr_t)&np->n_flag);
669 error = vinvalbuf(vp, flags, slpflag, 0);
671 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
672 if (np->n_flag & NFLUSHWANT) {
673 np->n_flag &= ~NFLUSHWANT;
674 wakeup((caddr_t)&np->n_flag);