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         if (vn_rlimit_fsize(vp, uiop, td))
  289                 return (EFBIG);
  290 
  291         scred = smbfs_malloc_scred();
  292         smb_makescred(scred, td, cred);
  293         error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  294         smbfs_free_scred(scred);
  295         SMBVDEBUG("after: ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 
  296             uiop->uio_resid);
  297         if (!error) {
  298                 if (uiop->uio_offset > np->n_size) {
  299                         np->n_size = uiop->uio_offset;
  300                         vnode_pager_setsize(vp, np->n_size);
  301                 }
  302         }
  303         return error;
  304 }
  305 
  306 /*
  307  * Do an I/O operation to/from a cache block.
  308  */
  309 int
  310 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
  311 {
  312         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  313         struct smbnode *np = VTOSMB(vp);
  314         struct uio *uiop;
  315         struct iovec io;
  316         struct smb_cred *scred;
  317         int error = 0;
  318 
  319         uiop = malloc(sizeof(struct uio), M_SMBFSDATA, M_WAITOK);
  320         uiop->uio_iov = &io;
  321         uiop->uio_iovcnt = 1;
  322         uiop->uio_segflg = UIO_SYSSPACE;
  323         uiop->uio_td = td;
  324 
  325         scred = smbfs_malloc_scred();
  326         smb_makescred(scred, td, cr);
  327 
  328         if (bp->b_iocmd == BIO_READ) {
  329             io.iov_len = uiop->uio_resid = bp->b_bcount;
  330             io.iov_base = bp->b_data;
  331             uiop->uio_rw = UIO_READ;
  332             switch (vp->v_type) {
  333               case VREG:
  334                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  335                 error = smb_read(smp->sm_share, np->n_fid, uiop, scred);
  336                 if (error)
  337                         break;
  338                 if (uiop->uio_resid) {
  339                         int left = uiop->uio_resid;
  340                         int nread = bp->b_bcount - left;
  341                         if (left > 0)
  342                             bzero((char *)bp->b_data + nread, left);
  343                 }
  344                 break;
  345             default:
  346                 printf("smbfs_doio:  type %x unexpected\n",vp->v_type);
  347                 break;
  348             }
  349             if (error) {
  350                 bp->b_error = error;
  351                 bp->b_ioflags |= BIO_ERROR;
  352             }
  353         } else { /* write */
  354             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  355                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  356 
  357             if (bp->b_dirtyend > bp->b_dirtyoff) {
  358                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  359                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  360                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  361                 uiop->uio_rw = UIO_WRITE;
  362                 error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  363 
  364                 /*
  365                  * For an interrupted write, the buffer is still valid
  366                  * and the write hasn't been pushed to the server yet,
  367                  * so we can't set BIO_ERROR and report the interruption
  368                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  369                  * is not relevant, so the rpc attempt is essentially
  370                  * a noop.  For the case of a V3 write rpc not being
  371                  * committed to stable storage, the block is still
  372                  * dirty and requires either a commit rpc or another
  373                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  374                  * the block is reused. This is indicated by setting
  375                  * the B_DELWRI and B_NEEDCOMMIT flags.
  376                  */
  377                 if (error == EINTR
  378                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  379                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  380                         if ((bp->b_flags & B_ASYNC) == 0)
  381                             bp->b_flags |= B_EINTR;
  382                         if ((bp->b_flags & B_PAGING) == 0) {
  383                             bdirty(bp);
  384                             bp->b_flags &= ~B_DONE;
  385                         }
  386                         if ((bp->b_flags & B_ASYNC) == 0)
  387                             bp->b_flags |= B_EINTR;
  388                 } else {
  389                         if (error) {
  390                                 bp->b_ioflags |= BIO_ERROR;
  391                                 bp->b_error = error;
  392                         }
  393                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  394                 }
  395             } else {
  396                 bp->b_resid = 0;
  397                 bufdone(bp);
  398                 free(uiop, M_SMBFSDATA);
  399                 smbfs_free_scred(scred);
  400                 return 0;
  401             }
  402         }
  403         bp->b_resid = uiop->uio_resid;
  404         bufdone(bp);
  405         free(uiop, M_SMBFSDATA);
  406         smbfs_free_scred(scred);
  407         return error;
  408 }
  409 
  410 /*
  411  * Vnode op for VM getpages.
  412  * Wish wish .... get rid from multiple IO routines
  413  */
  414 int
  415 smbfs_getpages(ap)
  416         struct vop_getpages_args /* {
  417                 struct vnode *a_vp;
  418                 vm_page_t *a_m;
  419                 int a_count;
  420                 int a_reqpage;
  421         } */ *ap;
  422 {
  423 #ifdef SMBFS_RWGENERIC
  424         return vop_stdgetpages(ap);
  425 #else
  426         int i, error, nextoff, size, toff, npages, count;
  427         struct uio uio;
  428         struct iovec iov;
  429         vm_offset_t kva;
  430         struct buf *bp;
  431         struct vnode *vp;
  432         struct thread *td;
  433         struct ucred *cred;
  434         struct smbmount *smp;
  435         struct smbnode *np;
  436         struct smb_cred *scred;
  437         vm_object_t object;
  438         vm_page_t *pages;
  439 
  440         vp = ap->a_vp;
  441         if ((object = vp->v_object) == NULL) {
  442                 printf("smbfs_getpages: called with non-merged cache vnode??\n");
  443                 return VM_PAGER_ERROR;
  444         }
  445 
  446         td = curthread;                         /* XXX */
  447         cred = td->td_ucred;            /* XXX */
  448         np = VTOSMB(vp);
  449         smp = VFSTOSMBFS(vp->v_mount);
  450         pages = ap->a_m;
  451         npages = ap->a_count;
  452 
  453         /*
  454          * If the requested page is partially valid, just return it and
  455          * allow the pager to zero-out the blanks.  Partially valid pages
  456          * can only occur at the file EOF.
  457          *
  458          * XXXGL: is that true for SMB filesystem?
  459          */
  460         VM_OBJECT_WLOCK(object);
  461         if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0)
  462                 goto out;
  463         VM_OBJECT_WUNLOCK(object);
  464 
  465         scred = smbfs_malloc_scred();
  466         smb_makescred(scred, td, cred);
  467 
  468         bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK);
  469 
  470         kva = (vm_offset_t) bp->b_data;
  471         pmap_qenter(kva, pages, npages);
  472         VM_CNT_INC(v_vnodein);
  473         VM_CNT_ADD(v_vnodepgsin, npages);
  474 
  475         count = npages << PAGE_SHIFT;
  476         iov.iov_base = (caddr_t) kva;
  477         iov.iov_len = count;
  478         uio.uio_iov = &iov;
  479         uio.uio_iovcnt = 1;
  480         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  481         uio.uio_resid = count;
  482         uio.uio_segflg = UIO_SYSSPACE;
  483         uio.uio_rw = UIO_READ;
  484         uio.uio_td = td;
  485 
  486         error = smb_read(smp->sm_share, np->n_fid, &uio, scred);
  487         smbfs_free_scred(scred);
  488         pmap_qremove(kva, npages);
  489 
  490         uma_zfree(smbfs_pbuf_zone, bp);
  491 
  492         if (error && (uio.uio_resid == count)) {
  493                 printf("smbfs_getpages: error %d\n",error);
  494                 return VM_PAGER_ERROR;
  495         }
  496 
  497         size = count - uio.uio_resid;
  498 
  499         VM_OBJECT_WLOCK(object);
  500         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  501                 vm_page_t m;
  502                 nextoff = toff + PAGE_SIZE;
  503                 m = pages[i];
  504 
  505                 if (nextoff <= size) {
  506                         /*
  507                          * Read operation filled an entire page
  508                          */
  509                         vm_page_valid(m);
  510                         KASSERT(m->dirty == 0,
  511                             ("smbfs_getpages: page %p is dirty", m));
  512                 } else if (size > toff) {
  513                         /*
  514                          * Read operation filled a partial page.
  515                          */
  516                         vm_page_invalid(m);
  517                         vm_page_set_valid_range(m, 0, size - toff);
  518                         KASSERT(m->dirty == 0,
  519                             ("smbfs_getpages: page %p is dirty", m));
  520                 } else {
  521                         /*
  522                          * Read operation was short.  If no error occurred
  523                          * we may have hit a zero-fill section.   We simply
  524                          * leave valid set to 0.
  525                          */
  526                         ;
  527                 }
  528         }
  529 out:
  530         VM_OBJECT_WUNLOCK(object);
  531         if (ap->a_rbehind)
  532                 *ap->a_rbehind = 0;
  533         if (ap->a_rahead)
  534                 *ap->a_rahead = 0;
  535         return (VM_PAGER_OK);
  536 #endif /* SMBFS_RWGENERIC */
  537 }
  538 
  539 /*
  540  * Vnode op for VM putpages.
  541  * possible bug: all IO done in sync mode
  542  * Note that vop_close always invalidate pages before close, so it's
  543  * not necessary to open vnode.
  544  */
  545 int
  546 smbfs_putpages(ap)
  547         struct vop_putpages_args /* {
  548                 struct vnode *a_vp;
  549                 vm_page_t *a_m;
  550                 int a_count;
  551                 int a_sync;
  552                 int *a_rtvals;
  553         } */ *ap;
  554 {
  555         int error;
  556         struct vnode *vp = ap->a_vp;
  557         struct thread *td;
  558         struct ucred *cred;
  559 
  560 #ifdef SMBFS_RWGENERIC
  561         td = curthread;                 /* XXX */
  562         cred = td->td_ucred;            /* XXX */
  563         VOP_OPEN(vp, FWRITE, cred, td, NULL);
  564         error = vop_stdputpages(ap);
  565         VOP_CLOSE(vp, FWRITE, cred, td);
  566         return error;
  567 #else
  568         struct uio uio;
  569         struct iovec iov;
  570         vm_offset_t kva;
  571         struct buf *bp;
  572         int i, npages, count;
  573         int *rtvals;
  574         struct smbmount *smp;
  575         struct smbnode *np;
  576         struct smb_cred *scred;
  577         vm_page_t *pages;
  578 
  579         td = curthread;                 /* XXX */
  580         cred = td->td_ucred;            /* XXX */
  581 /*      VOP_OPEN(vp, FWRITE, cred, td, NULL);*/
  582         np = VTOSMB(vp);
  583         smp = VFSTOSMBFS(vp->v_mount);
  584         pages = ap->a_m;
  585         count = ap->a_count;
  586         rtvals = ap->a_rtvals;
  587         npages = btoc(count);
  588 
  589         for (i = 0; i < npages; i++) {
  590                 rtvals[i] = VM_PAGER_ERROR;
  591         }
  592 
  593         bp = uma_zalloc(smbfs_pbuf_zone, M_WAITOK);
  594 
  595         kva = (vm_offset_t) bp->b_data;
  596         pmap_qenter(kva, pages, npages);
  597         VM_CNT_INC(v_vnodeout);
  598         VM_CNT_ADD(v_vnodepgsout, count);
  599 
  600         iov.iov_base = (caddr_t) kva;
  601         iov.iov_len = count;
  602         uio.uio_iov = &iov;
  603         uio.uio_iovcnt = 1;
  604         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  605         uio.uio_resid = count;
  606         uio.uio_segflg = UIO_SYSSPACE;
  607         uio.uio_rw = UIO_WRITE;
  608         uio.uio_td = td;
  609         SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 
  610             uio.uio_resid);
  611 
  612         scred = smbfs_malloc_scred();
  613         smb_makescred(scred, td, cred);
  614         error = smb_write(smp->sm_share, np->n_fid, &uio, scred);
  615         smbfs_free_scred(scred);
  616 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  617         SMBVDEBUG("paged write done: %d\n", error);
  618 
  619         pmap_qremove(kva, npages);
  620 
  621         uma_zfree(smbfs_pbuf_zone, bp);
  622 
  623         if (error == 0) {
  624                 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid,
  625                     npages * PAGE_SIZE, npages * PAGE_SIZE);
  626         }
  627         return (rtvals[0]);
  628 #endif /* SMBFS_RWGENERIC */
  629 }
  630 
  631 /*
  632  * Flush and invalidate all dirty buffers. If another process is already
  633  * doing the flush, just wait for completion.
  634  */
  635 int
  636 smbfs_vinvalbuf(struct vnode *vp, struct thread *td)
  637 {
  638         struct smbnode *np = VTOSMB(vp);
  639         int error = 0;
  640 
  641         if (VN_IS_DOOMED(vp))
  642                 return 0;
  643 
  644         while (np->n_flag & NFLUSHINPROG) {
  645                 np->n_flag |= NFLUSHWANT;
  646                 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz);
  647                 error = smb_td_intr(td);
  648                 if (error == EINTR)
  649                         return EINTR;
  650         }
  651         np->n_flag |= NFLUSHINPROG;
  652 
  653         if (vp->v_bufobj.bo_object != NULL) {
  654                 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
  655                 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
  656                 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
  657         }
  658 
  659         error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  660         while (error) {
  661                 if (error == ERESTART || error == EINTR) {
  662                         np->n_flag &= ~NFLUSHINPROG;
  663                         if (np->n_flag & NFLUSHWANT) {
  664                                 np->n_flag &= ~NFLUSHWANT;
  665                                 wakeup(&np->n_flag);
  666                         }
  667                         return EINTR;
  668                 }
  669                 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  670         }
  671         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  672         if (np->n_flag & NFLUSHWANT) {
  673                 np->n_flag &= ~NFLUSHWANT;
  674                 wakeup(&np->n_flag);
  675         }
  676         return (error);
  677 }

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