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  * $FreeBSD$
   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_mountfs(register struct vnode *, struct mount *, 
   59                                   struct hpfs_args *, struct thread *);
   60 
   61 static vfs_init_t       hpfs_init;
   62 static vfs_uninit_t     hpfs_uninit;
   63 static vfs_fhtovp_t     hpfs_fhtovp;
   64 static vfs_vget_t       hpfs_vget;
   65 static vfs_omount_t     hpfs_omount;
   66 static vfs_root_t       hpfs_root;
   67 static vfs_statfs_t     hpfs_statfs;
   68 static vfs_unmount_t    hpfs_unmount;
   69 static vfs_vptofh_t     hpfs_vptofh;
   70 
   71 static int
   72 hpfs_init (
   73         struct vfsconf *vcp )
   74 {
   75         dprintf(("hpfs_init():\n"));
   76         
   77         hpfs_hphashinit();
   78         return 0;
   79 }
   80 
   81 static int
   82 hpfs_uninit (vfsp)
   83         struct vfsconf *vfsp;
   84 {
   85         hpfs_hphashdestroy();
   86         return 0;;
   87 }
   88 
   89 static int
   90 hpfs_omount ( 
   91         struct mount *mp,
   92         char *path,
   93         caddr_t data,
   94         struct thread *td )
   95 {
   96         size_t          size;
   97         int             err = 0;
   98         struct vnode    *devvp;
   99         struct hpfs_args args;
  100         struct hpfsmount *hpmp = 0;
  101         struct nameidata ndp;
  102 
  103         dprintf(("hpfs_omount():\n"));
  104         /*
  105          ***
  106          * Mounting non-root filesystem or updating a filesystem
  107          ***
  108          */
  109 
  110         /* copy in user arguments*/
  111         err = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
  112         if (err)
  113                 goto error_1;           /* can't get arguments*/
  114 
  115         /*
  116          * If updating, check whether changing from read-only to
  117          * read/write; if there is no device name, that's all we do.
  118          */
  119         if (mp->mnt_flag & MNT_UPDATE) {
  120                 dprintf(("hpfs_omount: MNT_UPDATE: "));
  121 
  122                 hpmp = VFSTOHPFS(mp);
  123 
  124                 if (args.fspec == 0) {
  125                         dprintf(("export 0x%x\n",args.export.ex_flags));
  126                         err = vfs_export(mp, &args.export);
  127                         if (err) {
  128                                 printf("hpfs_omount: vfs_export failed %d\n",
  129                                         err);
  130                         }
  131                         goto success;
  132                 } else {
  133                         dprintf(("name [FAILED]\n"));
  134                         err = EINVAL;
  135                         goto success;
  136                 }
  137                 dprintf(("\n"));
  138         }
  139 
  140         /*
  141          * Not an update, or updating the name: look up the name
  142          * and verify that it refers to a sensible block device.
  143          */
  144         NDINIT(&ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
  145         err = namei(&ndp);
  146         if (err) {
  147                 /* can't get devvp!*/
  148                 goto error_1;
  149         }
  150 
  151         devvp = ndp.ni_vp;
  152 
  153         if (!vn_isdisk(devvp, &err)) 
  154                 goto error_2;
  155 
  156         /*
  157          ********************
  158          * NEW MOUNT
  159          ********************
  160          */
  161 
  162         /*
  163          * Since this is a new mount, we want the names for
  164          * the device and the mount point copied in.  If an
  165          * error occurs, the mountpoint is discarded by the
  166          * upper level code.  Note that vfs_omount() handles
  167          * copying the mountpoint f_mntonname for us, so we
  168          * don't have to do it here unless we want to set it
  169          * to something other than "path" for some rason.
  170          */
  171         /* Save "mounted from" info for mount point (NULL pad)*/
  172         copyinstr(      args.fspec,                     /* device name*/
  173                         mp->mnt_stat.f_mntfromname,     /* save area*/
  174                         MNAMELEN - 1,                   /* max size*/
  175                         &size);                         /* real size*/
  176         bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
  177 
  178         err = hpfs_mountfs(devvp, mp, &args, td);
  179         if (err)
  180                 goto error_2;
  181 
  182         /*
  183          * Initialize FS stat information in mount struct; uses both
  184          * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
  185          *
  186          * This code is common to root and non-root mounts
  187          */
  188         (void)VFS_STATFS(mp, &mp->mnt_stat, td);
  189 
  190         goto success;
  191 
  192 
  193 error_2:        /* error with devvp held*/
  194 
  195         /* release devvp before failing*/
  196         vrele(devvp);
  197 
  198 error_1:        /* no state to back out*/
  199         /* XXX: Missing NDFREE(&ndp, ...) */
  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         struct cdev *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)
  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, -1);
  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, td);
  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, td);
  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         struct thread *td )
  377 {
  378         int error = 0;
  379         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  380 
  381         dprintf(("hpfs_root():\n"));
  382         error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
  383         if(error) {
  384                 printf("hpfs_root: VFS_VGET failed: %d\n",error);
  385                 return (error);
  386         }
  387 
  388         return (error);
  389 }
  390 
  391 static int
  392 hpfs_statfs(
  393         struct mount *mp,
  394         struct statfs *sbp,
  395         struct thread *td)
  396 {
  397         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  398 
  399         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
  400                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
  401 
  402         sbp->f_type = mp->mnt_vfc->vfc_typenum;
  403         sbp->f_bsize = DEV_BSIZE;
  404         sbp->f_iosize = DEV_BSIZE;
  405         sbp->f_blocks = hpmp->hpm_su.su_btotal;
  406         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
  407         sbp->f_ffree = 0;
  408         sbp->f_files = 0;
  409         if (sbp != &mp->mnt_stat) {
  410                 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
  411                         (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
  412                 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
  413                         (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
  414         }
  415         sbp->f_flags = mp->mnt_flag;
  416         
  417         return (0);
  418 }
  419 
  420 /*ARGSUSED*/
  421 static int
  422 hpfs_fhtovp(
  423         struct mount *mp,
  424         struct fid *fhp,
  425         struct vnode **vpp)
  426 {
  427         struct vnode *nvp;
  428         struct hpfid *hpfhp = (struct hpfid *)fhp;
  429         int error;
  430 
  431         if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
  432                 *vpp = NULLVP;
  433                 return (error);
  434         }
  435         /* XXX as unlink/rmdir/mkdir/creat are not currently possible
  436          * with HPFS, we don't need to check anything else for now */
  437         *vpp = nvp;
  438 
  439         return (0);
  440 }
  441 
  442 static int
  443 hpfs_vptofh(
  444         struct vnode *vp,
  445         struct fid *fhp)
  446 {
  447         register struct hpfsnode *hpp;
  448         register struct hpfid *hpfhp;
  449 
  450         hpp = VTOHP(vp);
  451         hpfhp = (struct hpfid *)fhp;
  452         hpfhp->hpfid_len = sizeof(struct hpfid);
  453         hpfhp->hpfid_ino = hpp->h_no;
  454         /* hpfhp->hpfid_gen = hpp->h_gen; */
  455         return (0);
  456 }
  457 
  458 static int
  459 hpfs_vget(
  460         struct mount *mp,
  461         ino_t ino,
  462         int flags,
  463         struct vnode **vpp) 
  464 {
  465         struct hpfsmount *hpmp = VFSTOHPFS(mp);
  466         struct vnode *vp;
  467         struct hpfsnode *hp;
  468         struct buf *bp;
  469         struct thread *td = curthread;  /* XXX */
  470         int error;
  471 
  472         dprintf(("hpfs_vget(0x%x): ",ino));
  473 
  474         *vpp = NULL;
  475         hp = NULL;
  476         vp = NULL;
  477 
  478         if ((error = hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td)) != 0)
  479                 return (error);
  480         if (*vpp != NULL) {
  481                 dprintf(("hashed\n"));
  482                 return (0);
  483         }
  484 
  485         /*
  486          * We have to lock node creation for a while,
  487          * but then we have to call getnewvnode(), 
  488          * this may cause hpfs_reclaim() to be called,
  489          * this may need to VOP_VGET() parent dir for
  490          * update reasons, and if parent is not in
  491          * hash, we have to lock node creation...
  492          * To solve this, we MALLOC, getnewvnode and init while
  493          * not locked (probability of node appearence
  494          * at that time is little, and anyway - we'll
  495          * check for it).
  496          */
  497         MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode), 
  498                 M_HPFSNO, M_WAITOK);
  499 
  500         error = getnewvnode("hpfs", hpmp->hpm_mp, hpfs_vnodeop_p, &vp);
  501         if (error) {
  502                 printf("hpfs_vget: can't get new vnode\n");
  503                 FREE(hp, M_HPFSNO);
  504                 return (error);
  505         }
  506 
  507         dprintf(("prenew "));
  508 
  509         vp->v_data = hp;
  510 
  511         if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 
  512                 vp->v_vflag |= VV_ROOT;
  513 
  514 
  515         mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
  516 
  517         hp->h_flag = H_INVAL;
  518         hp->h_vp = vp;
  519         hp->h_hpmp = hpmp;
  520         hp->h_no = ino;
  521         hp->h_dev = hpmp->hpm_dev;
  522         hp->h_uid = hpmp->hpm_uid;
  523         hp->h_gid = hpmp->hpm_uid;
  524         hp->h_mode = hpmp->hpm_mode;
  525         hp->h_devvp = hpmp->hpm_devvp;
  526         VREF(hp->h_devvp);
  527 
  528         error = vn_lock(vp, LK_EXCLUSIVE, td);
  529         if (error) {
  530                 vput(vp);
  531                 return (error);
  532         }
  533 
  534         do {
  535                 if ((error =
  536                      hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td))) {
  537                         vput(vp);
  538                         return (error);
  539                 }
  540                 if (*vpp != NULL) {
  541                         dprintf(("hashed2\n"));
  542                         vput(vp);
  543                         return (0);
  544                 }
  545         } while(lockmgr(&hpfs_hphash_lock,LK_EXCLUSIVE|LK_SLEEPFAIL,NULL,NULL));
  546 
  547         hpfs_hphashins(hp);
  548 
  549         lockmgr(&hpfs_hphash_lock, LK_RELEASE, NULL, NULL);
  550 
  551         error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
  552         if (error) {
  553                 printf("hpfs_vget: can't read ino %d\n",ino);
  554                 vput(vp);
  555                 return (error);
  556         }
  557         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
  558         brelse(bp);
  559 
  560         if (hp->h_fn.fn_magic != FN_MAGIC) {
  561                 printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
  562                 vput(vp);
  563                 return (EINVAL);
  564         }
  565 
  566         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
  567         hp->h_flag &= ~H_INVAL;
  568 
  569         *vpp = vp;
  570 
  571         return (0);
  572 }
  573 
  574 static struct vfsops hpfs_vfsops = {
  575         .vfs_fhtovp =           hpfs_fhtovp,
  576         .vfs_init =             hpfs_init,
  577         .vfs_omount =           hpfs_omount,
  578         .vfs_root =             hpfs_root,
  579         .vfs_statfs =           hpfs_statfs,
  580         .vfs_uninit =           hpfs_uninit,
  581         .vfs_unmount =          hpfs_unmount,
  582         .vfs_vget =             hpfs_vget,
  583         .vfs_vptofh =           hpfs_vptofh,
  584 };
  585 VFS_SET(hpfs_vfsops, hpfs, 0);
Cache object: a8dbc954f2cb01458da206494cf87c9c
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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
