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  * Copyright (c) 2000-2001 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.4/sys/fs/smbfs/smbfs_io.c 250238 2013-05-04 14:27:28Z davide $
   27  *
   28  */
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <sys/fcntl.h>
   33 #include <sys/bio.h>
   34 #include <sys/buf.h>
   35 #include <sys/mount.h>
   36 #include <sys/namei.h>
   37 #include <sys/vnode.h>
   38 #include <sys/dirent.h>
   39 #include <sys/rwlock.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/vmmeter.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 #include <vm/vm_page.h>
   47 #include <vm/vm_extern.h>
   48 #include <vm/vm_object.h>
   49 #include <vm/vm_pager.h>
   50 #include <vm/vnode_pager.h>
   51 /*
   52 #include <sys/ioccom.h>
   53 */
   54 #include <netsmb/smb.h>
   55 #include <netsmb/smb_conn.h>
   56 #include <netsmb/smb_subr.h>
   57 
   58 #include <fs/smbfs/smbfs.h>
   59 #include <fs/smbfs/smbfs_node.h>
   60 #include <fs/smbfs/smbfs_subr.h>
   61 
   62 /*#define SMBFS_RWGENERIC*/
   63 
   64 extern int smbfs_pbuf_freecnt;
   65 
   66 static int smbfs_fastlookup = 1;
   67 
   68 SYSCTL_DECL(_vfs_smbfs);
   69 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
   70 
   71 
   72 #define DE_SIZE (sizeof(struct dirent))
   73 
   74 static int
   75 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
   76 {
   77         struct dirent de;
   78         struct componentname cn;
   79         struct smb_cred *scred;
   80         struct smbfs_fctx *ctx;
   81         struct vnode *newvp;
   82         struct smbnode *np = VTOSMB(vp);
   83         int error/*, *eofflag = ap->a_eofflag*/;
   84         long offset, limit;
   85 
   86         np = VTOSMB(vp);
   87         SMBVDEBUG("dirname='%s'\n", np->n_name);
   88         scred = smbfs_malloc_scred();
   89         smb_makescred(scred, uio->uio_td, cred);
   90         offset = uio->uio_offset / DE_SIZE;     /* offset in the directory */
   91         limit = uio->uio_resid / DE_SIZE;
   92         if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0) {
   93                 error = EINVAL;
   94                 goto out;
   95         }
   96         while (limit && offset < 2) {
   97                 limit--;
   98                 bzero((caddr_t)&de, DE_SIZE);
   99                 de.d_reclen = DE_SIZE;
  100                 de.d_fileno = (offset == 0) ? np->n_ino :
  101                     (np->n_parent ? np->n_parentino : 2);
  102                 if (de.d_fileno == 0)
  103                         de.d_fileno = 0x7ffffffd + offset;
  104                 de.d_namlen = offset + 1;
  105                 de.d_name[0] = '.';
  106                 de.d_name[1] = '.';
  107                 de.d_name[offset + 1] = '\0';
  108                 de.d_type = DT_DIR;
  109                 error = uiomove(&de, DE_SIZE, uio);
  110                 if (error)
  111                         goto out;
  112                 offset++;
  113                 uio->uio_offset += DE_SIZE;
  114         }
  115         if (limit == 0) {
  116                 error = 0;
  117                 goto out;
  118         }
  119         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
  120                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
  121                 if (np->n_dirseq) {
  122                         smbfs_findclose(np->n_dirseq, scred);
  123                         np->n_dirseq = NULL;
  124                 }
  125                 np->n_dirofs = 2;
  126                 error = smbfs_findopen(np, "*", 1,
  127                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
  128                     scred, &ctx);
  129                 if (error) {
  130                         SMBVDEBUG("can not open search, error = %d", error);
  131                         goto out;
  132                 }
  133                 np->n_dirseq = ctx;
  134         } else
  135                 ctx = np->n_dirseq;
  136         while (np->n_dirofs < offset) {
  137                 error = smbfs_findnext(ctx, offset - np->n_dirofs++, scred);
  138                 if (error) {
  139                         smbfs_findclose(np->n_dirseq, scred);
  140                         np->n_dirseq = NULL;
  141                         error = ENOENT ? 0 : error;
  142                         goto out;
  143                 }
  144         }
  145         error = 0;
  146         for (; limit; limit--, offset++) {
  147                 error = smbfs_findnext(ctx, limit, scred);
  148                 if (error)
  149                         break;
  150                 np->n_dirofs++;
  151                 bzero((caddr_t)&de, DE_SIZE);
  152                 de.d_reclen = DE_SIZE;
  153                 de.d_fileno = ctx->f_attr.fa_ino;
  154                 de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG;
  155                 de.d_namlen = ctx->f_nmlen;
  156                 bcopy(ctx->f_name, de.d_name, de.d_namlen);
  157                 de.d_name[de.d_namlen] = '\0';
  158                 if (smbfs_fastlookup) {
  159                         error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
  160                             ctx->f_nmlen, &ctx->f_attr, &newvp);
  161                         if (!error) {
  162                                 cn.cn_nameptr = de.d_name;
  163                                 cn.cn_namelen = de.d_namlen;
  164                                 cache_enter(vp, newvp, &cn);
  165                                 vput(newvp);
  166                         }
  167                 }
  168                 error = uiomove(&de, DE_SIZE, uio);
  169                 if (error)
  170                         break;
  171         }
  172         if (error == ENOENT)
  173                 error = 0;
  174         uio->uio_offset = offset * DE_SIZE;
  175 out:
  176         smbfs_free_scred(scred);
  177         return error;
  178 }
  179 
  180 int
  181 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
  182 {
  183         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  184         struct smbnode *np = VTOSMB(vp);
  185         struct thread *td;
  186         struct vattr vattr;
  187         struct smb_cred *scred;
  188         int error, lks;
  189 
  190         /*
  191          * Protect against method which is not supported for now
  192          */
  193         if (uiop->uio_segflg == UIO_NOCOPY)
  194                 return EOPNOTSUPP;
  195 
  196         if (vp->v_type != VREG && vp->v_type != VDIR) {
  197                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
  198                 return EIO;
  199         }
  200         if (uiop->uio_resid == 0)
  201                 return 0;
  202         if (uiop->uio_offset < 0)
  203                 return EINVAL;
  204 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  205                 return EFBIG;*/
  206         td = uiop->uio_td;
  207         if (vp->v_type == VDIR) {
  208                 lks = LK_EXCLUSIVE;     /* lockstatus(vp->v_vnlock); */
  209                 if (lks == LK_SHARED)
  210                         vn_lock(vp, LK_UPGRADE | LK_RETRY);
  211                 error = smbfs_readvdir(vp, uiop, cred);
  212                 if (lks == LK_SHARED)
  213                         vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  214                 return error;
  215         }
  216 
  217 /*      biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
  218         if (np->n_flag & NMODIFIED) {
  219                 smbfs_attr_cacheremove(vp);
  220                 error = VOP_GETATTR(vp, &vattr, cred);
  221                 if (error)
  222                         return error;
  223                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  224         } else {
  225                 error = VOP_GETATTR(vp, &vattr, cred);
  226                 if (error)
  227                         return error;
  228                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
  229                         error = smbfs_vinvalbuf(vp, td);
  230                         if (error)
  231                                 return error;
  232                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  233                 }
  234         }
  235         scred = smbfs_malloc_scred();
  236         smb_makescred(scred, td, cred);
  237         error = smb_read(smp->sm_share, np->n_fid, uiop, scred);
  238         smbfs_free_scred(scred);
  239         return (error);
  240 }
  241 
  242 int
  243 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
  244         struct ucred *cred, int ioflag)
  245 {
  246         struct smbmount *smp = VTOSMBFS(vp);
  247         struct smbnode *np = VTOSMB(vp);
  248         struct smb_cred *scred;
  249         struct thread *td;
  250         int error = 0;
  251 
  252         if (vp->v_type != VREG) {
  253                 SMBERROR("vn types other than VREG unsupported !\n");
  254                 return EIO;
  255         }
  256         SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 
  257             uiop->uio_resid);
  258         if (uiop->uio_offset < 0)
  259                 return EINVAL;
  260 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  261                 return (EFBIG);*/
  262         td = uiop->uio_td;
  263         if (ioflag & (IO_APPEND | IO_SYNC)) {
  264                 if (np->n_flag & NMODIFIED) {
  265                         smbfs_attr_cacheremove(vp);
  266                         error = smbfs_vinvalbuf(vp, td);
  267                         if (error)
  268                                 return error;
  269                 }
  270                 if (ioflag & IO_APPEND) {
  271 #ifdef notyet
  272                         /*
  273                          * File size can be changed by another client
  274                          */
  275                         smbfs_attr_cacheremove(vp);
  276                         error = VOP_GETATTR(vp, &vattr, cred);
  277                         if (error) return (error);
  278 #endif
  279                         uiop->uio_offset = np->n_size;
  280                 }
  281         }
  282         if (uiop->uio_resid == 0)
  283                 return 0;
  284 
  285         if (vn_rlimit_fsize(vp, uiop, td))
  286                 return (EFBIG);
  287         
  288         scred = smbfs_malloc_scred();
  289         smb_makescred(scred, td, cred);
  290         error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  291         smbfs_free_scred(scred);
  292         SMBVDEBUG("after: ofs=%jd,resid=%zd\n", (intmax_t)uiop->uio_offset, 
  293             uiop->uio_resid);
  294         if (!error) {
  295                 if (uiop->uio_offset > np->n_size) {
  296                         np->n_size = uiop->uio_offset;
  297                         vnode_pager_setsize(vp, np->n_size);
  298                 }
  299         }
  300         return error;
  301 }
  302 
  303 /*
  304  * Do an I/O operation to/from a cache block.
  305  */
  306 int
  307 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
  308 {
  309         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  310         struct smbnode *np = VTOSMB(vp);
  311         struct uio *uiop;
  312         struct iovec io;
  313         struct smb_cred *scred;
  314         int error = 0;
  315 
  316         uiop = malloc(sizeof(struct uio), M_SMBFSDATA, M_WAITOK);
  317         uiop->uio_iov = &io;
  318         uiop->uio_iovcnt = 1;
  319         uiop->uio_segflg = UIO_SYSSPACE;
  320         uiop->uio_td = td;
  321 
  322         scred = smbfs_malloc_scred();
  323         smb_makescred(scred, td, cr);
  324 
  325         if (bp->b_iocmd == BIO_READ) {
  326             io.iov_len = uiop->uio_resid = bp->b_bcount;
  327             io.iov_base = bp->b_data;
  328             uiop->uio_rw = UIO_READ;
  329             switch (vp->v_type) {
  330               case VREG:
  331                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  332                 error = smb_read(smp->sm_share, np->n_fid, uiop, scred);
  333                 if (error)
  334                         break;
  335                 if (uiop->uio_resid) {
  336                         int left = uiop->uio_resid;
  337                         int nread = bp->b_bcount - left;
  338                         if (left > 0)
  339                             bzero((char *)bp->b_data + nread, left);
  340                 }
  341                 break;
  342             default:
  343                 printf("smbfs_doio:  type %x unexpected\n",vp->v_type);
  344                 break;
  345             };
  346             if (error) {
  347                 bp->b_error = error;
  348                 bp->b_ioflags |= BIO_ERROR;
  349             }
  350         } else { /* write */
  351             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  352                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  353 
  354             if (bp->b_dirtyend > bp->b_dirtyoff) {
  355                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  356                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  357                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  358                 uiop->uio_rw = UIO_WRITE;
  359                 error = smb_write(smp->sm_share, np->n_fid, uiop, scred);
  360 
  361                 /*
  362                  * For an interrupted write, the buffer is still valid
  363                  * and the write hasn't been pushed to the server yet,
  364                  * so we can't set BIO_ERROR and report the interruption
  365                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  366                  * is not relevant, so the rpc attempt is essentially
  367                  * a noop.  For the case of a V3 write rpc not being
  368                  * committed to stable storage, the block is still
  369                  * dirty and requires either a commit rpc or another
  370                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  371                  * the block is reused. This is indicated by setting
  372                  * the B_DELWRI and B_NEEDCOMMIT flags.
  373                  */
  374                 if (error == EINTR
  375                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  376                         int s;
  377 
  378                         s = splbio();
  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                         splx(s);
  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                 vm_ooffset_t a_offset;
  423         } */ *ap;
  424 {
  425 #ifdef SMBFS_RWGENERIC
  426         return vop_stdgetpages(ap);
  427 #else
  428         int i, error, nextoff, size, toff, npages, count, reqpage;
  429         struct uio uio;
  430         struct iovec iov;
  431         vm_offset_t kva;
  432         struct buf *bp;
  433         struct vnode *vp;
  434         struct thread *td;
  435         struct ucred *cred;
  436         struct smbmount *smp;
  437         struct smbnode *np;
  438         struct smb_cred *scred;
  439         vm_object_t object;
  440         vm_page_t *pages, m;
  441 
  442         vp = ap->a_vp;
  443         if ((object = vp->v_object) == NULL) {
  444                 printf("smbfs_getpages: called with non-merged cache vnode??\n");
  445                 return VM_PAGER_ERROR;
  446         }
  447 
  448         td = curthread;                         /* XXX */
  449         cred = td->td_ucred;            /* XXX */
  450         np = VTOSMB(vp);
  451         smp = VFSTOSMBFS(vp->v_mount);
  452         pages = ap->a_m;
  453         count = ap->a_count;
  454         npages = btoc(count);
  455         reqpage = ap->a_reqpage;
  456 
  457         /*
  458          * If the requested page is partially valid, just return it and
  459          * allow the pager to zero-out the blanks.  Partially valid pages
  460          * can only occur at the file EOF.
  461          */
  462         m = pages[reqpage];
  463 
  464         VM_OBJECT_WLOCK(object);
  465         if (m->valid != 0) {
  466                 for (i = 0; i < npages; ++i) {
  467                         if (i != reqpage) {
  468                                 vm_page_lock(pages[i]);
  469                                 vm_page_free(pages[i]);
  470                                 vm_page_unlock(pages[i]);
  471                         }
  472                 }
  473                 VM_OBJECT_WUNLOCK(object);
  474                 return 0;
  475         }
  476         VM_OBJECT_WUNLOCK(object);
  477 
  478         scred = smbfs_malloc_scred();
  479         smb_makescred(scred, td, cred);
  480 
  481         bp = getpbuf(&smbfs_pbuf_freecnt);
  482 
  483         kva = (vm_offset_t) bp->b_data;
  484         pmap_qenter(kva, pages, npages);
  485         PCPU_INC(cnt.v_vnodein);
  486         PCPU_ADD(cnt.v_vnodepgsin, npages);
  487 
  488         iov.iov_base = (caddr_t) kva;
  489         iov.iov_len = count;
  490         uio.uio_iov = &iov;
  491         uio.uio_iovcnt = 1;
  492         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  493         uio.uio_resid = count;
  494         uio.uio_segflg = UIO_SYSSPACE;
  495         uio.uio_rw = UIO_READ;
  496         uio.uio_td = td;
  497 
  498         error = smb_read(smp->sm_share, np->n_fid, &uio, scred);
  499         smbfs_free_scred(scred);
  500         pmap_qremove(kva, npages);
  501 
  502         relpbuf(bp, &smbfs_pbuf_freecnt);
  503 
  504         VM_OBJECT_WLOCK(object);
  505         if (error && (uio.uio_resid == count)) {
  506                 printf("smbfs_getpages: error %d\n",error);
  507                 for (i = 0; i < npages; i++) {
  508                         if (reqpage != i) {
  509                                 vm_page_lock(pages[i]);
  510                                 vm_page_free(pages[i]);
  511                                 vm_page_unlock(pages[i]);
  512                         }
  513                 }
  514                 VM_OBJECT_WUNLOCK(object);
  515                 return VM_PAGER_ERROR;
  516         }
  517 
  518         size = count - uio.uio_resid;
  519 
  520         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  521                 vm_page_t m;
  522                 nextoff = toff + PAGE_SIZE;
  523                 m = pages[i];
  524 
  525                 if (nextoff <= size) {
  526                         /*
  527                          * Read operation filled an entire page
  528                          */
  529                         m->valid = VM_PAGE_BITS_ALL;
  530                         KASSERT(m->dirty == 0,
  531                             ("smbfs_getpages: page %p is dirty", m));
  532                 } else if (size > toff) {
  533                         /*
  534                          * Read operation filled a partial page.
  535                          */
  536                         m->valid = 0;
  537                         vm_page_set_valid_range(m, 0, size - toff);
  538                         KASSERT(m->dirty == 0,
  539                             ("smbfs_getpages: page %p is dirty", m));
  540                 } else {
  541                         /*
  542                          * Read operation was short.  If no error occured
  543                          * we may have hit a zero-fill section.   We simply
  544                          * leave valid set to 0.
  545                          */
  546                         ;
  547                 }
  548 
  549                 if (i != reqpage)
  550                         vm_page_readahead_finish(m);
  551         }
  552         VM_OBJECT_WUNLOCK(object);
  553         return 0;
  554 #endif /* SMBFS_RWGENERIC */
  555 }
  556 
  557 /*
  558  * Vnode op for VM putpages.
  559  * possible bug: all IO done in sync mode
  560  * Note that vop_close always invalidate pages before close, so it's
  561  * not necessary to open vnode.
  562  */
  563 int
  564 smbfs_putpages(ap)
  565         struct vop_putpages_args /* {
  566                 struct vnode *a_vp;
  567                 vm_page_t *a_m;
  568                 int a_count;
  569                 int a_sync;
  570                 int *a_rtvals;
  571                 vm_ooffset_t a_offset;
  572         } */ *ap;
  573 {
  574         int error;
  575         struct vnode *vp = ap->a_vp;
  576         struct thread *td;
  577         struct ucred *cred;
  578 
  579 #ifdef SMBFS_RWGENERIC
  580         td = curthread;                 /* XXX */
  581         cred = td->td_ucred;            /* XXX */
  582         VOP_OPEN(vp, FWRITE, cred, td, NULL);
  583         error = vop_stdputpages(ap);
  584         VOP_CLOSE(vp, FWRITE, cred, td);
  585         return error;
  586 #else
  587         struct uio uio;
  588         struct iovec iov;
  589         vm_offset_t kva;
  590         struct buf *bp;
  591         int i, npages, count;
  592         int *rtvals;
  593         struct smbmount *smp;
  594         struct smbnode *np;
  595         struct smb_cred *scred;
  596         vm_page_t *pages;
  597 
  598         td = curthread;                 /* XXX */
  599         cred = td->td_ucred;            /* XXX */
  600 /*      VOP_OPEN(vp, FWRITE, cred, td, NULL);*/
  601         np = VTOSMB(vp);
  602         smp = VFSTOSMBFS(vp->v_mount);
  603         pages = ap->a_m;
  604         count = ap->a_count;
  605         rtvals = ap->a_rtvals;
  606         npages = btoc(count);
  607 
  608         for (i = 0; i < npages; i++) {
  609                 rtvals[i] = VM_PAGER_ERROR;
  610         }
  611 
  612         bp = getpbuf(&smbfs_pbuf_freecnt);
  613 
  614         kva = (vm_offset_t) bp->b_data;
  615         pmap_qenter(kva, pages, npages);
  616         PCPU_INC(cnt.v_vnodeout);
  617         PCPU_ADD(cnt.v_vnodepgsout, count);
  618 
  619         iov.iov_base = (caddr_t) kva;
  620         iov.iov_len = count;
  621         uio.uio_iov = &iov;
  622         uio.uio_iovcnt = 1;
  623         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  624         uio.uio_resid = count;
  625         uio.uio_segflg = UIO_SYSSPACE;
  626         uio.uio_rw = UIO_WRITE;
  627         uio.uio_td = td;
  628         SMBVDEBUG("ofs=%jd,resid=%zd\n", (intmax_t)uio.uio_offset, 
  629             uio.uio_resid);
  630 
  631         scred = smbfs_malloc_scred();
  632         smb_makescred(scred, td, cred);
  633         error = smb_write(smp->sm_share, np->n_fid, &uio, scred);
  634         smbfs_free_scred(scred);
  635 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  636         SMBVDEBUG("paged write done: %d\n", error);
  637 
  638         pmap_qremove(kva, npages);
  639 
  640         relpbuf(bp, &smbfs_pbuf_freecnt);
  641 
  642         if (!error)
  643                 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid);
  644         return rtvals[0];
  645 #endif /* SMBFS_RWGENERIC */
  646 }
  647 
  648 /*
  649  * Flush and invalidate all dirty buffers. If another process is already
  650  * doing the flush, just wait for completion.
  651  */
  652 int
  653 smbfs_vinvalbuf(struct vnode *vp, struct thread *td)
  654 {
  655         struct smbnode *np = VTOSMB(vp);
  656         int error = 0;
  657 
  658         if (vp->v_iflag & VI_DOOMED)
  659                 return 0;
  660 
  661         while (np->n_flag & NFLUSHINPROG) {
  662                 np->n_flag |= NFLUSHWANT;
  663                 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz);
  664                 error = smb_td_intr(td);
  665                 if (error == EINTR)
  666                         return EINTR;
  667         }
  668         np->n_flag |= NFLUSHINPROG;
  669 
  670         if (vp->v_bufobj.bo_object != NULL) {
  671                 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
  672                 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
  673                 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
  674         }
  675 
  676         error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  677         while (error) {
  678                 if (error == ERESTART || error == EINTR) {
  679                         np->n_flag &= ~NFLUSHINPROG;
  680                         if (np->n_flag & NFLUSHWANT) {
  681                                 np->n_flag &= ~NFLUSHWANT;
  682                                 wakeup(&np->n_flag);
  683                         }
  684                         return EINTR;
  685                 }
  686                 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  687         }
  688         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  689         if (np->n_flag & NFLUSHWANT) {
  690                 np->n_flag &= ~NFLUSHWANT;
  691                 wakeup(&np->n_flag);
  692         }
  693         return (error);
  694 }

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