hpfs_vfsops.c

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    1 /*-
    2  * Copyright (c) 1998, 1999 Semen Ustimenko (semenu@FreeBSD.org)
    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/5.0/sys/fs/hpfs/hpfs_vfsops.c 106594 2002-11-07 22:33:28Z jhb $
   27  */
   28 
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/namei.h>
   33 #include <sys/conf.h>
   34 #include <sys/proc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/vnode.h>
   37 #include <sys/mount.h>
   38 #include <sys/bio.h>
   39 #include <sys/buf.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/malloc.h>
   42 
   43 #include <vm/vm.h>
   44 #include <vm/vm_param.h>
   45 #include <vm/vm_page.h>
   46 #include <vm/vm_object.h>
   47 #include <vm/vm_extern.h>
   48 
   49 #include <fs/hpfs/hpfs.h>
   50 #include <fs/hpfs/hpfsmount.h>
   51 #include <fs/hpfs/hpfs_subr.h>
   52 
   53 MALLOC_DEFINE(M_HPFSMNT, "HPFS mount", "HPFS mount structure");
   54 MALLOC_DEFINE(M_HPFSNO, "HPFS node", "HPFS node structure");
   55 
   56 struct sockaddr;
   57 
   58 static int      hpfs_root(struct mount *, struct vnode **);
   59 static int      hpfs_statfs(struct mount *, struct statfs *, struct thread *);
   60 static int      hpfs_unmount(struct mount *, int, struct thread *);
   61 static int      hpfs_vget(struct mount *mp, ino_t ino, int flags,
   62                                struct vnode **vpp);
   63 static int      hpfs_mountfs(register struct vnode *, struct mount *, 
   64                                   struct hpfs_args *, struct thread *);
   65 static int      hpfs_vptofh(struct vnode *, struct fid *);
   66 static int      hpfs_fhtovp(struct mount *, struct fid *, struct vnode **);
   67 static int      hpfs_mount(struct mount *, char *, caddr_t,
   68                                 struct nameidata *, struct thread *);
   69 static int      hpfs_init(struct vfsconf *);
   70 static int      hpfs_uninit(struct vfsconf *);
   71 
   72 static int
   73 hpfs_init (
   74         struct vfsconf *vcp )
   75 {
   76         dprintf(("hpfs_init():\n"));
   77         
   78         hpfs_hphashinit();
   79         return 0;
   80 }
   81 
   82 static int
   83 hpfs_uninit (vfsp)
   84         struct vfsconf *vfsp;
   85 {
   86         hpfs_hphashdestroy();
   87         return 0;;
   88 }
   89 
   90 static int
   91 hpfs_mount ( 
   92         struct mount *mp,
   93         char *path,
   94         caddr_t data,
   95         struct nameidata *ndp,
   96         struct thread *td )
   97 {
   98         size_t          size;
   99         int             err = 0;
  100         struct vnode    *devvp;
  101         struct hpfs_args args;
  102         struct hpfsmount *hpmp = 0;
  103 
  104         dprintf(("hpfs_mount():\n"));
  105         /*
  106          ***
  107          * Mounting non-root filesystem or updating a filesystem
  108          ***
  109          */
  110 
  111         /* copy in user arguments*/
  112         err = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
  113         if (err)
  114                 goto error_1;           /* can't get arguments*/
  115 
  116         /*
  117          * If updating, check whether changing from read-only to
  118          * read/write; if there is no device name, that's all we do.
  119          */
  120         if (mp->mnt_flag & MNT_UPDATE) {
  121                 dprintf(("hpfs_mount: MNT_UPDATE: "));
  122 
  123                 hpmp = VFSTOHPFS(mp);
  124 
  125                 if (args.fspec == 0) {
  126                         dprintf(("export 0x%x\n",args.export.ex_flags));
  127                         err = vfs_export(mp, &args.export);
  128                         if (err) {
  129                                 printf("hpfs_mount: vfs_export failed %d\n",
  130                                         err);
  131                         }
  132                         goto success;
  133                 } else {
  134                         dprintf(("name [FAILED]\n"));
  135                         err = EINVAL;
  136                         goto success;
  137                 }
  138                 dprintf(("\n"));
  139         }
  140 
  141         /*
  142          * Not an update, or updating the name: look up the name
  143          * and verify that it refers to a sensible block device.
  144          */
  145         NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
  146         err = namei(ndp);
  147         if (err) {
  148                 /* can't get devvp!*/
  149                 goto error_1;
  150         }
  151 
  152         devvp = ndp->ni_vp;
  153 
  154         if (!vn_isdisk(devvp, &err)) 
  155                 goto error_2;
  156 
  157         /*
  158          ********************
  159          * NEW MOUNT
  160          ********************
  161          */
  162 
  163         /*
  164          * Since this is a new mount, we want the names for
  165          * the device and the mount point copied in.  If an
  166          * error occurs, the mountpoint is discarded by the
  167          * upper level code.  Note that vfs_mount() handles
  168          * copying the mountpoint f_mntonname for us, so we
  169          * don't have to do it here unless we want to set it
  170          * to something other than "path" for some rason.
  171          */
  172         /* Save "mounted from" info for mount point (NULL pad)*/
  173         copyinstr(      args.fspec,                     /* device name*/
  174                         mp->mnt_stat.f_mntfromname,     /* save area*/
  175                         MNAMELEN - 1,                   /* max size*/
  176                         &size);                         /* real size*/
  177         bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
  178 
  179         err = hpfs_mountfs(devvp, mp, &args, td);
  180         if (err)
  181                 goto error_2;
  182 
  183         /*
  184          * Initialize FS stat information in mount struct; uses both
  185          * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
  186          *
  187          * This code is common to root and non-root mounts
  188          */
  189         (void)VFS_STATFS(mp, &mp->mnt_stat, td);
  190 
  191         goto success;
  192 
  193 
  194 error_2:        /* error with devvp held*/
  195 
  196         /* release devvp before failing*/
  197         vrele(devvp);
  198 
  199 error_1:        /* no state to back out*/
  200 
  201 success:
  202         return( err);
  203 }
  204 
  205 /*
  206  * Common code for mount and mountroot
  207  */
  208 int
  209 hpfs_mountfs(devvp, mp, argsp, td)
  210         register struct vnode *devvp;
  211         struct mount *mp;
  212         struct hpfs_args *argsp;
  213         struct thread *td;
  214 {
  215         int error, ncount, ronly;
  216         struct sublock *sup;
  217         struct spblock *spp;
  218         struct hpfsmount *hpmp;
  219         struct buf *bp = NULL;
  220         struct vnode *vp;
  221         dev_t dev = devvp->v_rdev;
  222 
  223         dprintf(("hpfs_mountfs():\n"));
  224         /*
  225          * Disallow multiple mounts of the same device.
  226          * Disallow mounting of a device that is currently in use
  227          * (except for root, which might share swap device for miniroot).
  228          * Flush out any old buffers remaining from a previous use.
  229          */
  230         error = vfs_mountedon(devvp);
  231         if (error)
  232                 return (error);
  233         ncount = vcount(devvp);
  234         if (devvp->v_object)
  235                 ncount -= 1;
  236         if (ncount > 1 && devvp != rootvp)
  237                 return (EBUSY);
  238 
  239         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
  240         error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0);
  241         VOP_UNLOCK(devvp, 0, td);
  242         if (error)
  243                 return (error);
  244 
  245         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  246         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
  247         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
  248         VOP_UNLOCK(devvp, 0, td);
  249         if (error)
  250                 return (error);
  251 
  252         /*
  253          * Do actual mount
  254          */
  255         hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
  256 
  257         /* Read in SuperBlock */
  258         error = bread(devvp, SUBLOCK, SUSIZE, NOCRED, &bp);
  259         if (error)
  260                 goto failed;
  261         bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
  262         brelse(bp); bp = NULL;
  263 
  264         /* Read in SpareBlock */
  265         error = bread(devvp, SPBLOCK, SPSIZE, NOCRED, &bp);
  266         if (error)
  267                 goto failed;
  268         bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
  269         brelse(bp); bp = NULL;
  270 
  271         sup = &hpmp->hpm_su;
  272         spp = &hpmp->hpm_sp;
  273 
  274         /* Check magic */
  275         if (sup->su_magic != SU_MAGIC) {
  276                 printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
  277                 error = EINVAL;
  278                 goto failed;
  279         }
  280         if (spp->sp_magic != SP_MAGIC) {
  281                 printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
  282                 error = EINVAL;
  283                 goto failed;
  284         }
  285 
  286         mp->mnt_data = (qaddr_t)hpmp;
  287         hpmp->hpm_devvp = devvp;
  288         hpmp->hpm_dev = devvp->v_rdev;
  289         hpmp->hpm_mp = mp;
  290         hpmp->hpm_uid = argsp->uid;
  291         hpmp->hpm_gid = argsp->gid;
  292         hpmp->hpm_mode = argsp->mode;
  293 
  294         error = hpfs_bminit(hpmp);
  295         if (error)
  296                 goto failed;
  297 
  298         error = hpfs_cpinit(hpmp, argsp);
  299         if (error) {
  300                 hpfs_bmdeinit(hpmp);
  301                 goto failed;
  302         }
  303 
  304         error = hpfs_root(mp, &vp);
  305         if (error) {
  306                 hpfs_cpdeinit(hpmp);
  307                 hpfs_bmdeinit(hpmp);
  308                 goto failed;
  309         }
  310 
  311         vput(vp);
  312 
  313         mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev);
  314         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
  315         mp->mnt_maxsymlinklen = 0;
  316         mp->mnt_flag |= MNT_LOCAL;
  317         devvp->v_rdev->si_mountpoint = mp;
  318         return (0);
  319 
  320 failed:
  321         if (bp)
  322                 brelse (bp);
  323         mp->mnt_data = (qaddr_t)NULL;
  324         devvp->v_rdev->si_mountpoint = NULL;
  325         (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, td);
  326         return (error);
  327 }
  328 
  329 static int
  330 hpfs_unmount( 
  331         struct mount *mp,
  332         int mntflags,
  333         struct thread *td)
  334 {
  335         int error, flags, ronly;
  336         register struct hpfsmount *hpmp = VFSTOHPFS(mp);
  337 
  338         dprintf(("hpfs_unmount():\n"));
  339 
  340         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
  341 
  342         flags = 0;
  343         if(mntflags & MNT_FORCE)
  344                 flags |= FORCECLOSE;
  345 
  346         dprintf(("hpfs_unmount: vflushing...\n"));
  347         
  348         error = vflush(mp, 0, flags);
  349         if (error) {
  350                 printf("hpfs_unmount: vflush failed: %d\n",error);
  351                 return (error);
  352         }
  353 
  354         hpmp->hpm_devvp->v_rdev->si_mountpoint = NULL;
  355 
  356         vinvalbuf(hpmp->hpm_devvp, V_SAVE, NOCRED, td, 0, 0);
  357         error = VOP_CLOSE(hpmp->hpm_devvp, ronly ? FREAD : FREAD|FWRITE,
  358                 NOCRED, td);
  359 
  360         vrele(hpmp->hpm_devvp);
  361 
  362         dprintf(("hpfs_umount: freeing memory...\n"));
  363         hpfs_cpdeinit(hpmp);
  364         hpfs_bmdeinit(hpmp);
  365         mp->mnt_data = (qaddr_t)0;
  366         mp->mnt_flag &= ~MNT_LOCAL;
  367         FREE(hpmp, M_HPFSMNT);
  368 
  369         return (0);
  370 }
  371 
  372 static int
  373 hpfs_root(
  374         struct mount *mp,
  375         struct vnode **vpp )
  376 {
  377         int error = 0;
  378         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  379 
  380         dprintf(("hpfs_root():\n"));
  381         error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
  382         if(error) {
  383                 printf("hpfs_root: VFS_VGET failed: %d\n",error);
  384                 return (error);
  385         }
  386 
  387         return (error);
  388 }
  389 
  390 static int
  391 hpfs_statfs(
  392         struct mount *mp,
  393         struct statfs *sbp,
  394         struct thread *td)
  395 {
  396         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  397 
  398         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
  399                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
  400 
  401         sbp->f_type = mp->mnt_vfc->vfc_typenum;
  402         sbp->f_bsize = DEV_BSIZE;
  403         sbp->f_iosize = DEV_BSIZE;
  404         sbp->f_blocks = hpmp->hpm_su.su_btotal;
  405         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
  406         sbp->f_ffree = 0;
  407         sbp->f_files = 0;
  408         if (sbp != &mp->mnt_stat) {
  409                 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
  410                         (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
  411                 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
  412                         (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
  413         }
  414         sbp->f_flags = mp->mnt_flag;
  415         
  416         return (0);
  417 }
  418 
  419 /*ARGSUSED*/
  420 static int
  421 hpfs_fhtovp(
  422         struct mount *mp,
  423         struct fid *fhp,
  424         struct vnode **vpp)
  425 {
  426         struct vnode *nvp;
  427         struct hpfid *hpfhp = (struct hpfid *)fhp;
  428         int error;
  429 
  430         if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  431                 *vpp = NULLVP;
  432                 return (error);
  433         }
  434         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  435          * with HPFS, we don't need to check anything else for now */
  436         *vpp = nvp;
  437 
  438         return (0);
  439 }
  440 
  441 static int
  442 hpfs_vptofh(
  443         struct vnode *vp,
  444         struct fid *fhp)
  445 {
  446         register struct hpfsnode *hpp;
  447         register struct hpfid *hpfhp;
  448 
  449         hpp = VTOHP(vp);
  450         hpfhp = (struct hpfid *)fhp;
  451         hpfhp->hpfid_len = sizeof(struct hpfid);
  452         hpfhp->hpfid_ino = hpp->h_no;
  453         /* hpfhp->hpfid_gen = hpp->h_gen; */
  454         return (0);
  455 }
  456 
  457 static int
  458 hpfs_vget(
  459         struct mount *mp,
  460         ino_t ino,
  461         int flags,
  462         struct vnode **vpp) 
  463 {
  464         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  465         struct vnode *vp;
  466         struct hpfsnode *hp;
  467         struct buf *bp;
  468         struct thread *td = curthread;  /* XXX */
  469         int error;
  470 
  471         dprintf(("hpfs_vget(0x%x): ",ino));
  472 
  473         *vpp = NULL;
  474         hp = NULL;
  475         vp = NULL;
  476 
  477         if ((error = hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td)) != 0)
  478                 return (error);
  479         if (*vpp != NULL) {
  480                 dprintf(("hashed\n"));
  481                 return (0);
  482         }
  483 
  484         /*
  485          * We have to lock node creation for a while,
  486          * but then we have to call getnewvnode(), 
  487          * this may cause hpfs_reclaim() to be called,
  488          * this may need to VOP_VGET() parent dir for
  489          * update reasons, and if parent is not in
  490          * hash, we have to lock node creation...
  491          * To solve this, we MALLOC, getnewvnode and init while
  492          * not locked (probability of node appearence
  493          * at that time is little, and anyway - we'll
  494          * check for it).
  495          */
  496         MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode), 
  497                 M_HPFSNO, M_WAITOK);
  498 
  499         error = getnewvnode("hpfs", hpmp->hpm_mp, hpfs_vnodeop_p, &vp);
  500         if (error) {
  501                 printf("hpfs_vget: can't get new vnode\n");
  502                 FREE(hp, M_HPFSNO);
  503                 return (error);
  504         }
  505 
  506         dprintf(("prenew "));
  507 
  508         vp->v_data = hp;
  509 
  510         if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 
  511                 vp->v_vflag |= VV_ROOT;
  512 
  513 
  514         mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
  515 
  516         hp->h_flag = H_INVAL;
  517         hp->h_vp = vp;
  518         hp->h_hpmp = hpmp;
  519         hp->h_no = ino;
  520         hp->h_dev = hpmp->hpm_dev;
  521         hp->h_uid = hpmp->hpm_uid;
  522         hp->h_gid = hpmp->hpm_uid;
  523         hp->h_mode = hpmp->hpm_mode;
  524         hp->h_devvp = hpmp->hpm_devvp;
  525         VREF(hp->h_devvp);
  526 
  527         error = vn_lock(vp, LK_EXCLUSIVE, td);
  528         if (error) {
  529                 vput(vp);
  530                 return (error);
  531         }
  532 
  533         do {
  534                 if ((error =
  535                      hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td))) {
  536                         vput(vp);
  537                         return (error);
  538                 }
  539                 if (*vpp != NULL) {
  540                         dprintf(("hashed2\n"));
  541                         vput(vp);
  542                         return (0);
  543                 }
  544         } while(lockmgr(&hpfs_hphash_lock,LK_EXCLUSIVE|LK_SLEEPFAIL,NULL,NULL));
  545 
  546         hpfs_hphashins(hp);
  547 
  548         lockmgr(&hpfs_hphash_lock, LK_RELEASE, NULL, NULL);
  549 
  550         error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
  551         if (error) {
  552                 printf("hpfs_vget: can't read ino %d\n",ino);
  553                 vput(vp);
  554                 return (error);
  555         }
  556         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
  557         brelse(bp);
  558 
  559         if (hp->h_fn.fn_magic != FN_MAGIC) {
  560                 printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
  561                 vput(vp);
  562                 return (EINVAL);
  563         }
  564 
  565         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
  566         hp->h_flag &= ~H_INVAL;
  567 
  568         *vpp = vp;
  569 
  570         return (0);
  571 }
  572 
  573 static struct vfsops hpfs_vfsops = {
  574         hpfs_mount,
  575         vfs_stdstart,
  576         hpfs_unmount,
  577         hpfs_root,
  578         vfs_stdquotactl,
  579         hpfs_statfs,
  580         vfs_stdsync,
  581         hpfs_vget,
  582         hpfs_fhtovp,
  583         vfs_stdcheckexp,
  584         hpfs_vptofh,
  585         hpfs_init,
  586         hpfs_uninit,
  587         vfs_stdextattrctl,
  588 };
  589 VFS_SET(hpfs_vfsops, hpfs, 0);
Cache object: 870be88e6892b99eba6503153618d4da
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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/hpfs_vfsops.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/hpfs_vfsops.c
