The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/smbfs/smbfs_io.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000-2001 Boris Popov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  *
   30  */
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/fcntl.h>
   35 #include <sys/bio.h>
   36 #include <sys/buf.h>
   37 #include <sys/mount.h>
   38 #include <sys/namei.h>
   39 #include <sys/vnode.h>
   40 #include <sys/dirent.h>
   41 #include <sys/rwlock.h>
   42 #include <sys/signalvar.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/vmmeter.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_param.h>
   48 #include <vm/vm_page.h>
   49 #include <vm/vm_extern.h>
   50 #include <vm/vm_object.h>
   51 #include <vm/vm_pager.h>
   52 #include <vm/vnode_pager.h>
   53 /*
   54 #include <sys/ioccom.h>
   55 */
   56 #include <netsmb/smb.h>
   57 #include <netsmb/smb_conn.h>
   58 #include <netsmb/smb_subr.h>
   59 
   60 #include <fs/smbfs/smbfs.h>
   61 #include <fs/smbfs/smbfs_node.h>
   62 #include <fs/smbfs/smbfs_subr.h>
   63 
   64 /*#define SMBFS_RWGENERIC*/
   65 
   66 extern uma_zone_t smbfs_pbuf_zone;
   67 
   68 static int smbfs_fastlookup = 1;
   69 
   70 SYSCTL_DECL(_vfs_smbfs);
   71 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
   72 
   73 #define DE_SIZE (sizeof(struct dirent))
   74 
   75 static int
   76 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
   77 {
   78         struct dirent de;
   79         struct componentname cn;
   80         struct smb_cred *scred;
   81         struct smbfs_fctx *ctx;
   82         struct vnode *newvp;
   83         struct smbnode *np = VTOSMB(vp);
   84         int error/*, *eofflag = ap->a_eofflag*/;
   85         long offset, limit;
   86 
   87         np = VTOSMB(vp);
   88         SMBVDEBUG("dirname='%s'\n", np->n_name);
   89         scred = smbfs_malloc_scred();
   90         smb_makescred(scred, uio->uio_td, cred);
   91         offset = uio->uio_offset / DE_SIZE;     /* offset in the directory */
   92         limit = uio->uio_resid / DE_SIZE;
   93         if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) {
   94                 error = EINVAL;
   95                 goto out;
   96         }
   97         while (limit && offset < 2) {
   98                 limit--;
   99                 bzero((caddr_t)&de, DE_SIZE);
  100                 de.d_reclen = DE_SIZE;
  101                 de.d_fileno = (offset == 0) ? np->n_ino :
  102                     (np->n_parent ? np->n_parentino : 2);
  103                 if (de.d_fileno == 0)
  104                         de.d_fileno = 0x7ffffffd + offset;
  105                 de.d_off = offset + 1;
  106                 de.d_namlen = offset + 1;
  107                 de.d_name[0] = '.';
  108                 de.d_name[1] = '.';
  109                 de.d_type = DT_DIR;
  110                 dirent_terminate(&de);
  111                 error = uiomove(&de, DE_SIZE, uio);
  112                 if (error)
  113                         goto out;
  114                 offset++;
  115                 uio->uio_offset += DE_SIZE;
  116         }
  117         if (limit == 0) {
  118                 error = 0;
  119                 goto out;
  120         }
  121         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
  122                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
  123                 if (np->n_dirseq) {
  124                         smbfs_findclose(np->n_dirseq, scred);
  125                         np->n_dirseq = NULL;
  126                 }
  127                 np->n_dirofs = 2;
  128                 error = smbfs_findopen(np, "*", 1,
  129                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
  130                     scred, &ctx);
  131                 if (error) {
  132                         SMBVDEBUG("can not open search, error = %d", error);
  133                         goto out;
  134                 }
  135                 np->n_dirseq = ctx;
  136         } else
  137                 ctx = np->n_dirseq;
  138         while (np->n_dirofs < offset) {
  139                 error = smbfs_findnext(ctx, offset - np->n_dirofs++, scred);
  140                 if (error) {
  141                         smbfs_findclose(np->n_dirseq, scred);
  142                         np->n_dirseq = NULL;
  143                         error = ENOENT ? 0 : error;
  144                         goto out;
  145                 }
  146         }
  147         error = 0;
  148         for (; limit; limit--, offset++) {
  149                 error = smbfs_findnext(ctx, limit, scred);
  150                 if (error)
  151                         break;
  152                 np->n_dirofs++;
  153                 bzero((caddr_t)&de, DE_SIZE);
  154                 de.d_reclen = DE_SIZE;
  155                 de.d_fileno = ctx->f_attr.fa_ino;
  156                 de.d_off = offset + 1;
  157                 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG;
  158                 de.d_namlen = ctx->f_nmlen;
  159                 bcopy(ctx->f_name, de.d_name, de.d_namlen);
  160                 dirent_terminate(&de);
  161                 if (smbfs_fastlookup) {
  162                         error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
  163                             ctx->f_nmlen, &ctx->f_attr, &newvp);
  164                         if (!error) {
  165                                 cn.cn_nameptr = de.d_name;
  166                                 cn.cn_namelen = de.d_namlen;
  167                                 cache_enter(vp, newvp, &cn);
  168                                 vput(newvp);
  169                         }
  170                 }
  171                 error = uiomove(&de, DE_SIZE, uio);
  172                 if (error)
  173                         break;
  174         }
  175         if (error == ENOENT)
  176                 error = 0;
  177         uio->uio_offset = offset * DE_SIZE;
  178 out:
  179         smbfs_free_scred(scred);
  180         return error;
  181 }
  182 
  183 int
  184 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
  185 {
  186         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  187         struct smbnode *np = VTOSMB(vp);
  188         struct thread *td;
  189         struct vattr vattr;
  190         struct smb_cred *scred;
  191         int error, lks;
  192 
  193         /*
  194          * Protect against method which is not supported for now
  195          */
  196         if (uiop->uio_segflg == UIO_NOCOPY)
  197                 return EOPNOTSUPP;
  198 
  199         if (vp->v_type != VREG && vp->v_type != VDIR) {
  200                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
  201                 return EIO;
  202         }
  203         if (uiop->uio_resid == 0)
  204                 return 0;
  205         if (uiop->uio_offset < 0)
  206                 return EINVAL;
  207 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  208                 return EFBIG;*/
  209         td = uiop->uio_td;
  210         if (vp->v_type == VDIR) {
  211                 lks = LK_EXCLUSIVE;     /* lockstatus(vp->v_vnlock); */
  212                 if (lks == LK_SHARED)
  213                         vn_lock(vp, LK_UPGRADE | LK_RETRY);
  214                 error = smbfs_readvdir(vp, uiop, cred);
  215                 if (lks == LK_SHARED)
  216                         vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  217                 return error;
  218         }
  219 
  220 /*      biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
  221         if (np->n_flag & NMODIFIED) {
  222                 smbfs_attr_cacheremove(vp);
  223                 error = VOP_GETATTR(vp, &vattr, cred);
  224                 if (error)
  225                         return error;
  226                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  227         } else {
  228                 error = VOP_GETATTR(vp, &vattr, cred);
  229                 if (error)
  230                         return error;
  231                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
  232                         error = smbfs_vinvalbuf(vp, td);
  233                         if (error)
  234                                 return error;
  235                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  236                 }
  237         }
  238         scred = smbfs_malloc_scred();
  239         smb_makescred(scred, td, cred);
  240         error = smb_read(smp->sm_share, np->n_fid, uiop, scred);
  241         smbfs_free_scred(scred);
  242         return (error);
  243 }
  244 
  245 int
  246 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
  247         struct ucred *cred, int ioflag)
  248 {
  249         struct smbmount *smp = VTOSMBFS(vp);
  250         struct smbnode *np = VTOSMB(vp);
  251         struct smb_cred *scred;
  252         struct thread *td;
  253         int error = 0;
  254 
  255         if (vp->v_type != VREG) {
  256                 SMBERROR("vn types other than VREG unsupported !\n");
  257                 return EIO;
  258         }
  259         SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 
  260             uiop->uio_resid);
  261         if (uiop->uio_offset < 0)
  262                 return EINVAL;
  263 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  264                 return (EFBIG);*/
  265         td = uiop->uio_td;
  266         if (ioflag & (IO_APPEND | IO_SYNC)) {
  267                 if (np->n_flag & NMODIFIED) {
  268                         smbfs_attr_cacheremove(vp);
  269                         error = smbfs_vinvalbuf(vp, td);
  270                         if (error)
  271                                 return error;
  272                 }
  273                 if (ioflag & IO_APPEND) {
  274 #ifdef notyet
  275                         /*
  276                          * File size can be changed by another client
  277                          */
  278                         smbfs_attr_cacheremove(vp);
  279                         error = VOP_GETATTR(vp, &vattr, cred);
  280                         if (error) return (error);
  281 #endif
  282                         uiop->uio_offset = np->n_size;
  283                 }
  284         }
  285         if (uiop->uio_resid == 0)
  286                 return 0;
  287 
  288         error = vn_rlimit_fsize(vp, uiop, td);
  289         if (error != 0)
  290                 return (error);
  291 
  292         scred = smbfs_malloc_scred();
  293         smb_makescred(scred, td, cred);
  294         error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  295         smbfs_free_scred(scred);
  296         SMBVDEBUG("after: ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 
  297             uiop->uio_resid);
  298         if (!error) {
  299                 if (uiop->uio_offset > np->n_size) {
  300                         np->n_size = uiop->uio_offset;
  301                         vnode_pager_setsize(vp, np->n_size);
  302                 }
  303         }
  304         return error;
  305 }
  306 
  307 /*
  308  * Do an I/O operation to/from a cache block.
  309  */
  310 int
  311 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
  312 {
  313         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  314         struct smbnode *np = VTOSMB(vp);
  315         struct uio *uiop;
  316         struct iovec io;
  317         struct smb_cred *scred;
  318         int error = 0;
  319 
  320         uiop = malloc(sizeof(struct uio), M_SMBFSDATA, M_WAITOK);
  321         uiop->uio_iov = &io;
  322         uiop->uio_iovcnt = 1;
  323         uiop->uio_segflg = UIO_SYSSPACE;
  324         uiop->uio_td = td;
  325 
  326         scred = smbfs_malloc_scred();
  327         smb_makescred(scred, td, cr);
  328 
  329         if (bp->b_iocmd == BIO_READ) {
  330             io.iov_len = uiop->uio_resid = bp->b_bcount;
  331             io.iov_base = bp->b_data;
  332             uiop->uio_rw = UIO_READ;
  333             switch (vp->v_type) {
  334               case VREG:
  335                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  336                 error = smb_read(smp->sm_share, np->n_fid, uiop, scred);
  337                 if (error)
  338                         break;
  339                 if (uiop->uio_resid) {
  340                         int left = uiop->uio_resid;
  341                         int nread = bp->b_bcount - left;
  342                         if (left > 0)
  343                             bzero((char *)bp->b_data + nread, left);
  344                 }
  345                 break;
  346             default:
  347                 printf("smbfs_doio:  type %x unexpected\n",vp->v_type);
  348                 break;
  349             }
  350             if (error) {
  351                 bp->b_error = error;
  352                 bp->b_ioflags |= BIO_ERROR;
  353             }
  354         } else { /* write */
  355             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  356                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  357 
  358             if (bp->b_dirtyend > bp->b_dirtyoff) {
  359                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  360                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  361                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  362                 uiop->uio_rw = UIO_WRITE;
  363                 error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  364 
  365                 /*
  366                  * For an interrupted write, the buffer is still valid
  367                  * and the write hasn't been pushed to the server yet,
  368                  * so we can't set BIO_ERROR and report the interruption
  369                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  370                  * is not relevant, so the rpc attempt is essentially
  371                  * a noop.  For the case of a V3 write rpc not being
  372                  * committed to stable storage, the block is still
  373                  * dirty and requires either a commit rpc or another
  374                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  375                  * the block is reused. This is indicated by setting
  376                  * the B_DELWRI and B_NEEDCOMMIT flags.
  377                  */
  378                 if (error == EINTR
  379                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  380                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  381                         if ((bp->b_flags & B_ASYNC) == 0)
  382                             bp->b_flags |= B_EINTR;
  383                         if ((bp->b_flags & B_PAGING) == 0) {
  384                             bdirty(bp);
  385                             bp->b_flags &= ~B_DONE;
  386                         }
  387                         if ((bp->b_flags & B_ASYNC) == 0)
  388                             bp->b_flags |= B_EINTR;
  389                 } else {
  390                         if (error) {
  391                                 bp->b_ioflags |= BIO_ERROR;
  392                                 bp->b_error = error;
  393                         }
  394                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  395                 }
  396             } else {
  397                 bp->b_resid = 0;
  398                 bufdone(bp);
  399                 free(uiop, M_SMBFSDATA);
  400                 smbfs_free_scred(scred);
  401                 return 0;
  402             }
  403         }
  404         bp->b_resid = uiop->uio_resid;
  405         bufdone(bp);
  406         free(uiop, M_SMBFSDATA);
  407         smbfs_free_scred(scred);
  408         return error;
  409 }
  410 
  411 /*
  412  * Vnode op for VM getpages.
  413  * Wish wish .... get rid from multiple IO routines
  414  */
  415 int
  416 smbfs_getpages(ap)
  417         struct vop_getpages_args /* {
  418                 struct vnode *a_vp;
  419                 vm_page_t *a_m;
  420                 int a_count;
  421                 int a_reqpage;
  422         } */ *ap;
  423 {
  424 #ifdef SMBFS_RWGENERIC
  425         return vop_stdgetpages(ap);
  426 #else
  427         int i, error, nextoff, size, toff, npages, count;
  428         struct uio uio;
  429         struct iovec iov;
  430         vm_offset_t kva;
  431         struct buf *bp;
  432         struct vnode *vp;
  433         struct thread *td;
  434         struct ucred *cred;
  435         struct smbmount *smp;
  436         struct smbnode *np;
  437         struct smb_cred *scred;
  438         vm_object_t object;
  439         vm_page_t *pages;
  440 
  441         vp = ap->a_vp;
  442         if ((object = vp->v_object) == NULL) {
  443                 printf("smbfs_getpages: called with non-merged cache vnode??\n");
  444                 return VM_PAGER_ERROR;
  445         }
  446 
  447         td = curthread;                         /* XXX */
  448         cred = td->td_ucred;            /* XXX */
  449         np = VTOSMB(vp);
  450         smp = VFSTOSMBFS(vp->v_mount);
  451         pages = ap->a_m;
  452         npages = ap->a_count;
  453 
  454         /*
  455          * If the requested page is partially valid, just return it and
  456          * allow the pager to zero-out the blanks.  Partially valid pages
  457          * can only occur at the file EOF.
  458          *
  459          * XXXGL: is that true for SMB filesystem?
  460          */
  461         VM_OBJECT_WLOCK(object);
  462         if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0)
  463                 goto out;
  464         VM_OBJECT_WUNLOCK(object);
  465 
  466         scred = smbfs_malloc_scred();
  467         smb_makescred(scred, td, cred);
  468 
  469         bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK);
  470 
  471         kva = (vm_offset_t) bp->b_data;
  472         pmap_qenter(kva, pages, npages);
  473         VM_CNT_INC(v_vnodein);
  474         VM_CNT_ADD(v_vnodepgsin, npages);
  475 
  476         count = npages << PAGE_SHIFT;
  477         iov.iov_base = (caddr_t) kva;
  478         iov.iov_len = count;
  479         uio.uio_iov = &iov;
  480         uio.uio_iovcnt = 1;
  481         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  482         uio.uio_resid = count;
  483         uio.uio_segflg = UIO_SYSSPACE;
  484         uio.uio_rw = UIO_READ;
  485         uio.uio_td = td;
  486 
  487         error = smb_read(smp->sm_share, np->n_fid, &uio, scred);
  488         smbfs_free_scred(scred);
  489         pmap_qremove(kva, npages);
  490 
  491         uma_zfree(smbfs_pbuf_zone, bp);
  492 
  493         if (error && (uio.uio_resid == count)) {
  494                 printf("smbfs_getpages: error %d\n",error);
  495                 return VM_PAGER_ERROR;
  496         }
  497 
  498         size = count - uio.uio_resid;
  499 
  500         VM_OBJECT_WLOCK(object);
  501         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  502                 vm_page_t m;
  503                 nextoff = toff + PAGE_SIZE;
  504                 m = pages[i];
  505 
  506                 if (nextoff <= size) {
  507                         /*
  508                          * Read operation filled an entire page
  509                          */
  510                         vm_page_valid(m);
  511                         KASSERT(m->dirty == 0,
  512                             ("smbfs_getpages: page %p is dirty", m));
  513                 } else if (size > toff) {
  514                         /*
  515                          * Read operation filled a partial page.
  516                          */
  517                         vm_page_invalid(m);
  518                         vm_page_set_valid_range(m, 0, size - toff);
  519                         KASSERT(m->dirty == 0,
  520                             ("smbfs_getpages: page %p is dirty", m));
  521                 } else {
  522                         /*
  523                          * Read operation was short.  If no error occurred
  524                          * we may have hit a zero-fill section.   We simply
  525                          * leave valid set to 0.
  526                          */
  527                         ;
  528                 }
  529         }
  530 out:
  531         VM_OBJECT_WUNLOCK(object);
  532         if (ap->a_rbehind)
  533                 *ap->a_rbehind = 0;
  534         if (ap->a_rahead)
  535                 *ap->a_rahead = 0;
  536         return (VM_PAGER_OK);
  537 #endif /* SMBFS_RWGENERIC */
  538 }
  539 
  540 /*
  541  * Vnode op for VM putpages.
  542  * possible bug: all IO done in sync mode
  543  * Note that vop_close always invalidate pages before close, so it's
  544  * not necessary to open vnode.
  545  */
  546 int
  547 smbfs_putpages(ap)
  548         struct vop_putpages_args /* {
  549                 struct vnode *a_vp;
  550                 vm_page_t *a_m;
  551                 int a_count;
  552                 int a_sync;
  553                 int *a_rtvals;
  554         } */ *ap;
  555 {
  556         int error;
  557         struct vnode *vp = ap->a_vp;
  558         struct thread *td;
  559         struct ucred *cred;
  560 
  561 #ifdef SMBFS_RWGENERIC
  562         td = curthread;                 /* XXX */
  563         cred = td->td_ucred;            /* XXX */
  564         VOP_OPEN(vp, FWRITE, cred, td, NULL);
  565         error = vop_stdputpages(ap);
  566         VOP_CLOSE(vp, FWRITE, cred, td);
  567         return error;
  568 #else
  569         struct uio uio;
  570         struct iovec iov;
  571         vm_offset_t kva;
  572         struct buf *bp;
  573         int i, npages, count;
  574         int *rtvals;
  575         struct smbmount *smp;
  576         struct smbnode *np;
  577         struct smb_cred *scred;
  578         vm_page_t *pages;
  579 
  580         td = curthread;                 /* XXX */
  581         cred = td->td_ucred;            /* XXX */
  582 /*      VOP_OPEN(vp, FWRITE, cred, td, NULL);*/
  583         np = VTOSMB(vp);
  584         smp = VFSTOSMBFS(vp->v_mount);
  585         pages = ap->a_m;
  586         count = ap->a_count;
  587         rtvals = ap->a_rtvals;
  588         npages = btoc(count);
  589 
  590         for (i = 0; i < npages; i++) {
  591                 rtvals[i] = VM_PAGER_ERROR;
  592         }
  593 
  594         bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK);
  595 
  596         kva = (vm_offset_t) bp->b_data;
  597         pmap_qenter(kva, pages, npages);
  598         VM_CNT_INC(v_vnodeout);
  599         VM_CNT_ADD(v_vnodepgsout, count);
  600 
  601         iov.iov_base = (caddr_t) kva;
  602         iov.iov_len = count;
  603         uio.uio_iov = &iov;
  604         uio.uio_iovcnt = 1;
  605         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  606         uio.uio_resid = count;
  607         uio.uio_segflg = UIO_SYSSPACE;
  608         uio.uio_rw = UIO_WRITE;
  609         uio.uio_td = td;
  610         SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 
  611             uio.uio_resid);
  612 
  613         scred = smbfs_malloc_scred();
  614         smb_makescred(scred, td, cred);
  615         error = smb_write(smp->sm_share, np->n_fid, &uio, scred);
  616         smbfs_free_scred(scred);
  617 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  618         SMBVDEBUG("paged write done: %d\n", error);
  619 
  620         pmap_qremove(kva, npages);
  621 
  622         uma_zfree(smbfs_pbuf_zone, bp);
  623 
  624         if (error == 0) {
  625                 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid,
  626                     npages * PAGE_SIZE, npages * PAGE_SIZE);
  627         }
  628         return (rtvals[0]);
  629 #endif /* SMBFS_RWGENERIC */
  630 }
  631 
  632 /*
  633  * Flush and invalidate all dirty buffers. If another process is already
  634  * doing the flush, just wait for completion.
  635  */
  636 int
  637 smbfs_vinvalbuf(struct vnode *vp, struct thread *td)
  638 {
  639         struct smbnode *np = VTOSMB(vp);
  640         int error = 0;
  641 
  642         if (VN_IS_DOOMED(vp))
  643                 return 0;
  644 
  645         while (np->n_flag & NFLUSHINPROG) {
  646                 np->n_flag |= NFLUSHWANT;
  647                 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz);
  648                 error = smb_td_intr(td);
  649                 if (error == EINTR)
  650                         return EINTR;
  651         }
  652         np->n_flag |= NFLUSHINPROG;
  653 
  654         if (vp->v_bufobj.bo_object != NULL) {
  655                 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
  656                 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
  657                 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
  658         }
  659 
  660         error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  661         while (error) {
  662                 if (error == ERESTART || error == EINTR) {
  663                         np->n_flag &= ~NFLUSHINPROG;
  664                         if (np->n_flag & NFLUSHWANT) {
  665                                 np->n_flag &= ~NFLUSHWANT;
  666                                 wakeup(&np->n_flag);
  667                         }
  668                         return EINTR;
  669                 }
  670                 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  671         }
  672         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  673         if (np->n_flag & NFLUSHWANT) {
  674                 np->n_flag &= ~NFLUSHWANT;
  675                 wakeup(&np->n_flag);
  676         }
  677         return (error);
  678 }

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