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  * 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.
   19  *
   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
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/8.0/sys/fs/smbfs/smbfs_io.c 192986 2009-05-28 18:11:09Z alc $
   33  *
   34  */
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/resourcevar.h>    /* defines plimit structure in proc struct */
   38 #include <sys/kernel.h>
   39 #include <sys/proc.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/bio.h>
   42 #include <sys/buf.h>
   43 #include <sys/mount.h>
   44 #include <sys/namei.h>
   45 #include <sys/vnode.h>
   46 #include <sys/dirent.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/vmmeter.h>
   50 
   51 #include <vm/vm.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>
   57 /*
   58 #include <sys/ioccom.h>
   59 */
   60 #include <netsmb/smb.h>
   61 #include <netsmb/smb_conn.h>
   62 #include <netsmb/smb_subr.h>
   63 
   64 #include <fs/smbfs/smbfs.h>
   65 #include <fs/smbfs/smbfs_node.h>
   66 #include <fs/smbfs/smbfs_subr.h>
   67 
   68 /*#define SMBFS_RWGENERIC*/
   69 
   70 extern int smbfs_pbuf_freecnt;
   71 
   72 static int smbfs_fastlookup = 1;
   73 
   74 SYSCTL_DECL(_vfs_smbfs);
   75 SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
   76 
   77 
   78 #define DE_SIZE (sizeof(struct dirent))
   79 
   80 static int
   81 smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
   82 {
   83         struct dirent de;
   84         struct componentname cn;
   85         struct smb_cred scred;
   86         struct smbfs_fctx *ctx;
   87         struct vnode *newvp;
   88         struct smbnode *np = VTOSMB(vp);
   89         int error/*, *eofflag = ap->a_eofflag*/;
   90         long offset, limit;
   91 
   92         np = VTOSMB(vp);
   93         SMBVDEBUG("dirname='%s'\n", np->n_name);
   94         smb_makescred(&scred, uio->uio_td, cred);
   95         offset = uio->uio_offset / DE_SIZE;     /* offset in the directory */
   96         limit = uio->uio_resid / DE_SIZE;
   97         if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0)
   98                 return EINVAL;
   99         while (limit && offset < 2) {
  100                 limit--;
  101                 bzero((caddr_t)&de, DE_SIZE);
  102                 de.d_reclen = DE_SIZE;
  103                 de.d_fileno = (offset == 0) ? np->n_ino :
  104                     (np->n_parent ? VTOSMB(np->n_parent)->n_ino : 2);
  105                 if (de.d_fileno == 0)
  106                         de.d_fileno = 0x7ffffffd + offset;
  107                 de.d_namlen = offset + 1;
  108                 de.d_name[0] = '.';
  109                 de.d_name[1] = '.';
  110                 de.d_name[offset + 1] = '\0';
  111                 de.d_type = DT_DIR;
  112                 error = uiomove(&de, DE_SIZE, uio);
  113                 if (error)
  114                         return error;
  115                 offset++;
  116                 uio->uio_offset += DE_SIZE;
  117         }
  118         if (limit == 0)
  119                 return 0;
  120         if (offset != np->n_dirofs || np->n_dirseq == NULL) {
  121                 SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
  122                 if (np->n_dirseq) {
  123                         smbfs_findclose(np->n_dirseq, &scred);
  124                         np->n_dirseq = NULL;
  125                 }
  126                 np->n_dirofs = 2;
  127                 error = smbfs_findopen(np, "*", 1,
  128                     SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
  129                     &scred, &ctx);
  130                 if (error) {
  131                         SMBVDEBUG("can not open search, error = %d", error);
  132                         return error;
  133                 }
  134                 np->n_dirseq = ctx;
  135         } else
  136                 ctx = np->n_dirseq;
  137         while (np->n_dirofs < offset) {
  138                 error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred);
  139                 if (error) {
  140                         smbfs_findclose(np->n_dirseq, &scred);
  141                         np->n_dirseq = NULL;
  142                         return error == ENOENT ? 0 : error;
  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         return error;
  176 }
  177 
  178 int
  179 smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
  180 {
  181         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  182         struct smbnode *np = VTOSMB(vp);
  183         struct thread *td;
  184         struct vattr vattr;
  185         struct smb_cred scred;
  186         int error, lks;
  187 
  188         /*
  189          * Protect against method which is not supported for now
  190          */
  191         if (uiop->uio_segflg == UIO_NOCOPY)
  192                 return EOPNOTSUPP;
  193 
  194         if (vp->v_type != VREG && vp->v_type != VDIR) {
  195                 SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
  196                 return EIO;
  197         }
  198         if (uiop->uio_resid == 0)
  199                 return 0;
  200         if (uiop->uio_offset < 0)
  201                 return EINVAL;
  202 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  203                 return EFBIG;*/
  204         td = uiop->uio_td;
  205         if (vp->v_type == VDIR) {
  206                 lks = LK_EXCLUSIVE;     /* lockstatus(vp->v_vnlock); */
  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);
  212                 return error;
  213         }
  214 
  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, cred);
  219                 if (error)
  220                         return error;
  221                 np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  222         } else {
  223                 error = VOP_GETATTR(vp, &vattr, cred);
  224                 if (error)
  225                         return error;
  226                 if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
  227                         error = smbfs_vinvalbuf(vp, td);
  228                         if (error)
  229                                 return error;
  230                         np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
  231                 }
  232         }
  233         smb_makescred(&scred, td, cred);
  234         return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
  235 }
  236 
  237 int
  238 smbfs_writevnode(struct vnode *vp, struct uio *uiop,
  239         struct ucred *cred, int ioflag)
  240 {
  241         struct smbmount *smp = VTOSMBFS(vp);
  242         struct smbnode *np = VTOSMB(vp);
  243         struct smb_cred scred;
  244         struct proc *p;
  245         struct thread *td;
  246         int error = 0;
  247 
  248         if (vp->v_type != VREG) {
  249                 SMBERROR("vn types other than VREG unsupported !\n");
  250                 return EIO;
  251         }
  252         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  253         if (uiop->uio_offset < 0)
  254                 return EINVAL;
  255 /*      if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
  256                 return (EFBIG);*/
  257         td = uiop->uio_td;
  258         p = td->td_proc;
  259         if (ioflag & (IO_APPEND | IO_SYNC)) {
  260                 if (np->n_flag & NMODIFIED) {
  261                         smbfs_attr_cacheremove(vp);
  262                         error = smbfs_vinvalbuf(vp, td);
  263                         if (error)
  264                                 return error;
  265                 }
  266                 if (ioflag & IO_APPEND) {
  267 #ifdef notyet
  268                         /*
  269                          * File size can be changed by another client
  270                          */
  271                         smbfs_attr_cacheremove(vp);
  272                         error = VOP_GETATTR(vp, &vattr, cred);
  273                         if (error) return (error);
  274 #endif
  275                         uiop->uio_offset = np->n_size;
  276                 }
  277         }
  278         if (uiop->uio_resid == 0)
  279                 return 0;
  280         if (p != NULL) {
  281                 PROC_LOCK(p);
  282                 if (uiop->uio_offset + uiop->uio_resid >
  283                     lim_cur(p, RLIMIT_FSIZE)) {
  284                         psignal(p, SIGXFSZ);
  285                         PROC_UNLOCK(p);
  286                         return EFBIG;
  287                 }
  288                 PROC_UNLOCK(p);
  289         }
  290         smb_makescred(&scred, td, cred);
  291         error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
  292         SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
  293         if (!error) {
  294                 if (uiop->uio_offset > np->n_size) {
  295                         np->n_size = uiop->uio_offset;
  296                         vnode_pager_setsize(vp, np->n_size);
  297                 }
  298         }
  299         return error;
  300 }
  301 
  302 /*
  303  * Do an I/O operation to/from a cache block.
  304  */
  305 int
  306 smbfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
  307 {
  308         struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
  309         struct smbnode *np = VTOSMB(vp);
  310         struct uio uio, *uiop = &uio;
  311         struct iovec io;
  312         struct smb_cred scred;
  313         int error = 0;
  314 
  315         uiop->uio_iov = &io;
  316         uiop->uio_iovcnt = 1;
  317         uiop->uio_segflg = UIO_SYSSPACE;
  318         uiop->uio_td = td;
  319 
  320         smb_makescred(&scred, td, cr);
  321 
  322         if (bp->b_iocmd == BIO_READ) {
  323             io.iov_len = uiop->uio_resid = bp->b_bcount;
  324             io.iov_base = bp->b_data;
  325             uiop->uio_rw = UIO_READ;
  326             switch (vp->v_type) {
  327               case VREG:
  328                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
  329                 error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
  330                 if (error)
  331                         break;
  332                 if (uiop->uio_resid) {
  333                         int left = uiop->uio_resid;
  334                         int nread = bp->b_bcount - left;
  335                         if (left > 0)
  336                             bzero((char *)bp->b_data + nread, left);
  337                 }
  338                 break;
  339             default:
  340                 printf("smbfs_doio:  type %x unexpected\n",vp->v_type);
  341                 break;
  342             };
  343             if (error) {
  344                 bp->b_error = error;
  345                 bp->b_ioflags |= BIO_ERROR;
  346             }
  347         } else { /* write */
  348             if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
  349                 bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
  350 
  351             if (bp->b_dirtyend > bp->b_dirtyoff) {
  352                 io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
  353                 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
  354                 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
  355                 uiop->uio_rw = UIO_WRITE;
  356                 error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
  357 
  358                 /*
  359                  * For an interrupted write, the buffer is still valid
  360                  * and the write hasn't been pushed to the server yet,
  361                  * so we can't set BIO_ERROR and report the interruption
  362                  * by setting B_EINTR. For the B_ASYNC case, B_EINTR
  363                  * is not relevant, so the rpc attempt is essentially
  364                  * a noop.  For the case of a V3 write rpc not being
  365                  * committed to stable storage, the block is still
  366                  * dirty and requires either a commit rpc or another
  367                  * write rpc with iomode == NFSV3WRITE_FILESYNC before
  368                  * the block is reused. This is indicated by setting
  369                  * the B_DELWRI and B_NEEDCOMMIT flags.
  370                  */
  371                 if (error == EINTR
  372                     || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
  373                         int s;
  374 
  375                         s = splbio();
  376                         bp->b_flags &= ~(B_INVAL|B_NOCACHE);
  377                         if ((bp->b_flags & B_ASYNC) == 0)
  378                             bp->b_flags |= B_EINTR;
  379                         if ((bp->b_flags & B_PAGING) == 0) {
  380                             bdirty(bp);
  381                             bp->b_flags &= ~B_DONE;
  382                         }
  383                         if ((bp->b_flags & B_ASYNC) == 0)
  384                             bp->b_flags |= B_EINTR;
  385                         splx(s);
  386                 } else {
  387                         if (error) {
  388                                 bp->b_ioflags |= BIO_ERROR;
  389                                 bp->b_error = error;
  390                         }
  391                         bp->b_dirtyoff = bp->b_dirtyend = 0;
  392                 }
  393             } else {
  394                 bp->b_resid = 0;
  395                 bufdone(bp);
  396                 return 0;
  397             }
  398         }
  399         bp->b_resid = uiop->uio_resid;
  400         bufdone(bp);
  401         return error;
  402 }
  403 
  404 /*
  405  * Vnode op for VM getpages.
  406  * Wish wish .... get rid from multiple IO routines
  407  */
  408 int
  409 smbfs_getpages(ap)
  410         struct vop_getpages_args /* {
  411                 struct vnode *a_vp;
  412                 vm_page_t *a_m;
  413                 int a_count;
  414                 int a_reqpage;
  415                 vm_ooffset_t a_offset;
  416         } */ *ap;
  417 {
  418 #ifdef SMBFS_RWGENERIC
  419         return vop_stdgetpages(ap);
  420 #else
  421         int i, error, nextoff, size, toff, npages, count, reqpage;
  422         struct uio uio;
  423         struct iovec iov;
  424         vm_offset_t kva;
  425         struct buf *bp;
  426         struct vnode *vp;
  427         struct thread *td;
  428         struct ucred *cred;
  429         struct smbmount *smp;
  430         struct smbnode *np;
  431         struct smb_cred scred;
  432         vm_object_t object;
  433         vm_page_t *pages, m;
  434 
  435         vp = ap->a_vp;
  436         if ((object = vp->v_object) == NULL) {
  437                 printf("smbfs_getpages: called with non-merged cache vnode??\n");
  438                 return VM_PAGER_ERROR;
  439         }
  440 
  441         td = curthread;                         /* XXX */
  442         cred = td->td_ucred;            /* XXX */
  443         np = VTOSMB(vp);
  444         smp = VFSTOSMBFS(vp->v_mount);
  445         pages = ap->a_m;
  446         count = ap->a_count;
  447         npages = btoc(count);
  448         reqpage = ap->a_reqpage;
  449 
  450         /*
  451          * If the requested page is partially valid, just return it and
  452          * allow the pager to zero-out the blanks.  Partially valid pages
  453          * can only occur at the file EOF.
  454          */
  455         m = pages[reqpage];
  456 
  457         VM_OBJECT_LOCK(object);
  458         if (m->valid != 0) {
  459                 vm_page_lock_queues();
  460                 for (i = 0; i < npages; ++i) {
  461                         if (i != reqpage)
  462                                 vm_page_free(pages[i]);
  463                 }
  464                 vm_page_unlock_queues();
  465                 VM_OBJECT_UNLOCK(object);
  466                 return 0;
  467         }
  468         VM_OBJECT_UNLOCK(object);
  469 
  470         smb_makescred(&scred, td, cred);
  471 
  472         bp = getpbuf(&smbfs_pbuf_freecnt);
  473 
  474         kva = (vm_offset_t) bp->b_data;
  475         pmap_qenter(kva, pages, npages);
  476         PCPU_INC(cnt.v_vnodein);
  477         PCPU_ADD(cnt.v_vnodepgsin, npages);
  478 
  479         iov.iov_base = (caddr_t) kva;
  480         iov.iov_len = count;
  481         uio.uio_iov = &iov;
  482         uio.uio_iovcnt = 1;
  483         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  484         uio.uio_resid = count;
  485         uio.uio_segflg = UIO_SYSSPACE;
  486         uio.uio_rw = UIO_READ;
  487         uio.uio_td = td;
  488 
  489         error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
  490         pmap_qremove(kva, npages);
  491 
  492         relpbuf(bp, &smbfs_pbuf_freecnt);
  493 
  494         VM_OBJECT_LOCK(object);
  495         if (error && (uio.uio_resid == count)) {
  496                 printf("smbfs_getpages: error %d\n",error);
  497                 vm_page_lock_queues();
  498                 for (i = 0; i < npages; i++) {
  499                         if (reqpage != i)
  500                                 vm_page_free(pages[i]);
  501                 }
  502                 vm_page_unlock_queues();
  503                 VM_OBJECT_UNLOCK(object);
  504                 return VM_PAGER_ERROR;
  505         }
  506 
  507         size = count - uio.uio_resid;
  508 
  509         vm_page_lock_queues();
  510         for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
  511                 vm_page_t m;
  512                 nextoff = toff + PAGE_SIZE;
  513                 m = pages[i];
  514 
  515                 if (nextoff <= size) {
  516                         /*
  517                          * Read operation filled an entire page
  518                          */
  519                         m->valid = VM_PAGE_BITS_ALL;
  520                         KASSERT(m->dirty == 0,
  521                             ("smbfs_getpages: page %p is dirty", m));
  522                 } else if (size > toff) {
  523                         /*
  524                          * Read operation filled a partial page.
  525                          */
  526                         m->valid = 0;
  527                         vm_page_set_valid(m, 0, size - toff);
  528                         KASSERT(m->dirty == 0,
  529                             ("smbfs_getpages: page %p is dirty", m));
  530                 } else {
  531                         /*
  532                          * Read operation was short.  If no error occured
  533                          * we may have hit a zero-fill section.   We simply
  534                          * leave valid set to 0.
  535                          */
  536                         ;
  537                 }
  538 
  539                 if (i != reqpage) {
  540                         /*
  541                          * Whether or not to leave the page activated is up in
  542                          * the air, but we should put the page on a page queue
  543                          * somewhere (it already is in the object).  Result:
  544                          * It appears that emperical results show that
  545                          * deactivating pages is best.
  546                          */
  547 
  548                         /*
  549                          * Just in case someone was asking for this page we
  550                          * now tell them that it is ok to use.
  551                          */
  552                         if (!error) {
  553                                 if (m->oflags & VPO_WANTED)
  554                                         vm_page_activate(m);
  555                                 else
  556                                         vm_page_deactivate(m);
  557                                 vm_page_wakeup(m);
  558                         } else {
  559                                 vm_page_free(m);
  560                         }
  561                 }
  562         }
  563         vm_page_unlock_queues();
  564         VM_OBJECT_UNLOCK(object);
  565         return 0;
  566 #endif /* SMBFS_RWGENERIC */
  567 }
  568 
  569 /*
  570  * Vnode op for VM putpages.
  571  * possible bug: all IO done in sync mode
  572  * Note that vop_close always invalidate pages before close, so it's
  573  * not necessary to open vnode.
  574  */
  575 int
  576 smbfs_putpages(ap)
  577         struct vop_putpages_args /* {
  578                 struct vnode *a_vp;
  579                 vm_page_t *a_m;
  580                 int a_count;
  581                 int a_sync;
  582                 int *a_rtvals;
  583                 vm_ooffset_t a_offset;
  584         } */ *ap;
  585 {
  586         int error;
  587         struct vnode *vp = ap->a_vp;
  588         struct thread *td;
  589         struct ucred *cred;
  590 
  591 #ifdef SMBFS_RWGENERIC
  592         td = curthread;                 /* XXX */
  593         cred = td->td_ucred;            /* XXX */
  594         VOP_OPEN(vp, FWRITE, cred, td, NULL);
  595         error = vop_stdputpages(ap);
  596         VOP_CLOSE(vp, FWRITE, cred, td);
  597         return error;
  598 #else
  599         struct uio uio;
  600         struct iovec iov;
  601         vm_offset_t kva;
  602         struct buf *bp;
  603         int i, npages, count;
  604         int *rtvals;
  605         struct smbmount *smp;
  606         struct smbnode *np;
  607         struct smb_cred scred;
  608         vm_page_t *pages;
  609 
  610         td = curthread;                 /* XXX */
  611         cred = td->td_ucred;            /* XXX */
  612 /*      VOP_OPEN(vp, FWRITE, cred, td, NULL);*/
  613         np = VTOSMB(vp);
  614         smp = VFSTOSMBFS(vp->v_mount);
  615         pages = ap->a_m;
  616         count = ap->a_count;
  617         rtvals = ap->a_rtvals;
  618         npages = btoc(count);
  619 
  620         for (i = 0; i < npages; i++) {
  621                 rtvals[i] = VM_PAGER_AGAIN;
  622         }
  623 
  624         bp = getpbuf(&smbfs_pbuf_freecnt);
  625 
  626         kva = (vm_offset_t) bp->b_data;
  627         pmap_qenter(kva, pages, npages);
  628         PCPU_INC(cnt.v_vnodeout);
  629         PCPU_ADD(cnt.v_vnodepgsout, count);
  630 
  631         iov.iov_base = (caddr_t) kva;
  632         iov.iov_len = count;
  633         uio.uio_iov = &iov;
  634         uio.uio_iovcnt = 1;
  635         uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
  636         uio.uio_resid = count;
  637         uio.uio_segflg = UIO_SYSSPACE;
  638         uio.uio_rw = UIO_WRITE;
  639         uio.uio_td = td;
  640         SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
  641 
  642         smb_makescred(&scred, td, cred);
  643         error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
  644 /*      VOP_CLOSE(vp, FWRITE, cred, td);*/
  645         SMBVDEBUG("paged write done: %d\n", error);
  646 
  647         pmap_qremove(kva, npages);
  648 
  649         relpbuf(bp, &smbfs_pbuf_freecnt);
  650 
  651         if (!error) {
  652                 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
  653                 vm_page_lock_queues();
  654                 for (i = 0; i < nwritten; i++) {
  655                         rtvals[i] = VM_PAGER_OK;
  656                         vm_page_undirty(pages[i]);
  657                 }
  658                 vm_page_unlock_queues();
  659         }
  660         return rtvals[0];
  661 #endif /* SMBFS_RWGENERIC */
  662 }
  663 
  664 /*
  665  * Flush and invalidate all dirty buffers. If another process is already
  666  * doing the flush, just wait for completion.
  667  */
  668 int
  669 smbfs_vinvalbuf(struct vnode *vp, struct thread *td)
  670 {
  671         struct smbnode *np = VTOSMB(vp);
  672         int error = 0;
  673 
  674         if (vp->v_iflag & VI_DOOMED)
  675                 return 0;
  676 
  677         while (np->n_flag & NFLUSHINPROG) {
  678                 np->n_flag |= NFLUSHWANT;
  679                 error = tsleep(&np->n_flag, PRIBIO + 2, "smfsvinv", 2 * hz);
  680                 error = smb_td_intr(td);
  681                 if (error == EINTR)
  682                         return EINTR;
  683         }
  684         np->n_flag |= NFLUSHINPROG;
  685 
  686         if (vp->v_bufobj.bo_object != NULL) {
  687                 VM_OBJECT_LOCK(vp->v_bufobj.bo_object);
  688                 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
  689                 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object);
  690         }
  691 
  692         error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  693         while (error) {
  694                 if (error == ERESTART || error == EINTR) {
  695                         np->n_flag &= ~NFLUSHINPROG;
  696                         if (np->n_flag & NFLUSHWANT) {
  697                                 np->n_flag &= ~NFLUSHWANT;
  698                                 wakeup(&np->n_flag);
  699                         }
  700                         return EINTR;
  701                 }
  702                 error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
  703         }
  704         np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
  705         if (np->n_flag & NFLUSHWANT) {
  706                 np->n_flag &= ~NFLUSHWANT;
  707                 wakeup(&np->n_flag);
  708         }
  709         return (error);
  710 }

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