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

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