sys/vfs/hpfs/hpfs_vfsops.c

   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: src/sys/fs/hpfs/hpfs_vfsops.c,v 1.3.2.2 2001/12/25 01:44:45 dillon Exp $
  27  */
  28
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/nlookup.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/buf.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/malloc.h>
  41
  42 #include <machine/inttypes.h>
  43
  44 #include <vm/vm.h>
  45 #include <vm/vm_param.h>
  46 #if defined(__NetBSD__)
  47 #include <vm/vm_prot.h>
  48 #endif
  49 #include <vm/vm_page.h>
  50 #include <vm/vm_object.h>
  51 #include <vm/vm_extern.h>
  52
  53 #include <sys/buf2.h>
  54
  55 #if defined(__NetBSD__)
  56 #include <miscfs/specfs/specdev.h>
  57 #endif
  58
  59 #include "hpfs.h"
  60 #include "hpfsmount.h"
  61 #include "hpfs_subr.h"
  62
  63 extern struct vop_ops hpfs_vnode_vops;
  64
  65 MALLOC_DEFINE(M_HPFSMNT, "HPFS mount", "HPFS mount structure");
  66 MALLOC_DEFINE(M_HPFSNO, "HPFS node", "HPFS node structure");
  67
  68 static int      hpfs_root (struct mount *, struct vnode **);
  69 static int      hpfs_statfs (struct mount *, struct statfs *, struct ucred *);
  70 static int      hpfs_unmount (struct mount *, int);
  71 static int      hpfs_vget (struct mount *mp, struct vnode *,
  72                                 ino_t ino, struct vnode **vpp);
  73 static int      hpfs_mountfs (struct vnode *, struct mount *,
  74                                 struct hpfs_args *);
  75 static int      hpfs_vptofh (struct vnode *, struct fid *);
  76 static int      hpfs_fhtovp (struct mount *, struct vnode *,
  77                                 struct fid *, struct vnode **);
  78
  79
  80 struct sockaddr;
  81 static int      hpfs_mount (struct mount *, char *, caddr_t, struct ucred *);
  82 static int      hpfs_init (struct vfsconf *);
  83 static int      hpfs_checkexp (struct mount *, struct sockaddr *,
  84                                    int *, struct ucred **);
  85
  86 /*ARGSUSED*/
  87 static int
  88 hpfs_checkexp(struct mount *mp,
  89               struct sockaddr *nam,
  90               int *exflagsp, struct ucred **credanonp)
  91 {
  92         struct netcred *np;
  93         struct hpfsmount *hpm = VFSTOHPFS(mp);
  94
  95         /*
  96          * Get the export permission structure for this <mp, client> tuple.
  97          */
  98         np = vfs_export_lookup(mp, &hpm->hpm_export, nam);
  99         if (np == NULL)
 100                 return (EACCES);
 101
 102         *exflagsp = np->netc_exflags;
 103         *credanonp = &np->netc_anon;
 104         return (0);
 105 }
 106
 107 static int
 108 hpfs_init(struct vfsconf *vcp)
 109 {
 110         dprintf(("hpfs_init():\n"));
 111
 112         hpfs_hphashinit();
 113         return 0;
 114 }
 115
 116 static int
 117 hpfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 118 {
 119         size_t          size;
 120         int             error;
 121         struct vnode    *devvp;
 122         struct hpfs_args args;
 123         struct hpfsmount *hpmp = NULL;
 124         struct nlookupdata nd;
 125
 126         dprintf(("hpfs_mount():\n"));
 127         /*
 128          ***
 129          * Mounting non-root file system or updating a file system
 130          ***
 131          */
 132
 133         /* copy in user arguments*/
 134         error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
 135         if (error)
 136                 goto error_1;           /* can't get arguments*/
 137
 138         /*
 139          * If updating, check whether changing from read-only to
 140          * read/write; if there is no device name, that's all we do.
 141          */
 142         if (mp->mnt_flag & MNT_UPDATE) {
 143                 dprintf(("hpfs_mount: MNT_UPDATE: "));
 144
 145                 hpmp = VFSTOHPFS(mp);
 146
 147                 if (args.fspec == NULL) {
 148                         dprintf(("export 0x%x\n",args.export.ex_flags));
 149                         error = vfs_export(mp, &hpmp->hpm_export, &args.export);
 150                         if (error) {
 151                                 kprintf("hpfs_mount: vfs_export failed %d\n",
 152                                         error);
 153                         }
 154                 } else {
 155                         dprintf(("name [FAILED]\n"));
 156                         error = EINVAL;
 157                 }
 158                 goto success;
 159         }
 160
 161         /*
 162          * Not an update, or updating the name: look up the name
 163          * and verify that it refers to a sensible block device.
 164          */
 165         devvp = NULL;
 166         error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
 167         if (error == 0)
 168                 error = nlookup(&nd);
 169         if (error == 0)
 170                 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
 171         nlookup_done(&nd);
 172         if (error)
 173                 goto error_1;
 174
 175         if (!vn_isdisk(devvp, &error))
 176                 goto error_2;
 177
 178         /*
 179          ********************
 180          * NEW MOUNT
 181          ********************
 182          */
 183
 184         /* Save "mounted from" info for mount point (NULL pad)*/
 185         copyinstr(      args.fspec,                     /* device name*/
 186                         mp->mnt_stat.f_mntfromname,     /* save area*/
 187                         MNAMELEN - 1,                   /* max size*/
 188                         &size);                         /* real size*/
 189         bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 190
 191         error = hpfs_mountfs(devvp, mp, &args);
 192         if (error)
 193                 goto error_2;
 194
 195         /*
 196          * Initialize FS stat information in mount struct; uses
 197          * mp->mnt_stat.f_mntfromname.
 198          *
 199          * This code is common to root and non-root mounts
 200          */
 201         VFS_STATFS(mp, &mp->mnt_stat, cred);
 202         return (error);
 203
 204 error_2:        /* error with devvp held*/
 205
 206         /* release devvp before failing*/
 207         vrele(devvp);
 208
 209 error_1:        /* no state to back out*/
 210
 211 success:
 212         return (error);
 213 }
 214
 215 /*
 216  * Common code for mount and mountroot
 217  */
 218 int
 219 hpfs_mountfs(struct vnode *devvp, struct mount *mp, struct hpfs_args *argsp)
 220 {
 221         int error, ncount, ronly;
 222         struct sublock *sup;
 223         struct spblock *spp;
 224         struct hpfsmount *hpmp;
 225         struct buf *bp = NULL;
 226         struct vnode *vp;
 227         cdev_t dev;
 228
 229         dprintf(("hpfs_mountfs():\n"));
 230         /*
 231          * Disallow multiple mounts of the same device.
 232          * Disallow mounting of a device that is currently in use
 233          * (except for root, which might share swap device for miniroot).
 234          * Flush out any old buffers remaining from a previous use.
 235          */
 236         error = vfs_mountedon(devvp);
 237         if (error)
 238                 return (error);
 239         ncount = vcount(devvp);
 240         if (devvp->v_object)
 241                 ncount -= 1;
 242         if (ncount > 0)
 243                 return (EBUSY);
 244
 245         VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY);
 246         error = vinvalbuf(devvp, V_SAVE, 0, 0);
 247         VOP__UNLOCK(devvp, 0);
 248         if (error)
 249                 return (error);
 250
 251         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
 252         VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY);
 253         error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
 254         VOP__UNLOCK(devvp, 0);
 255         if (error)
 256                 return (error);
 257         dev = devvp->v_rdev;
 258
 259         /*
 260          * Do actual mount
 261          */
 262         hpmp = kmalloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
 263
 264         /* Read in SuperBlock */
 265         error = bread(devvp, dbtodoff(SUBLOCK), SUSIZE, &bp);
 266         if (error)
 267                 goto failed;
 268         bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
 269         brelse(bp); bp = NULL;
 270
 271         /* Read in SpareBlock */
 272         error = bread(devvp, dbtodoff(SPBLOCK), SPSIZE, &bp);
 273         if (error)
 274                 goto failed;
 275         bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
 276         brelse(bp); bp = NULL;
 277
 278         sup = &hpmp->hpm_su;
 279         spp = &hpmp->hpm_sp;
 280
 281         /* Check magic */
 282         if (sup->su_magic != SU_MAGIC) {
 283                 kprintf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
 284                 error = EINVAL;
 285                 goto failed;
 286         }
 287         if (spp->sp_magic != SP_MAGIC) {
 288                 kprintf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
 289                 error = EINVAL;
 290                 goto failed;
 291         }
 292
 293         mp->mnt_data = (qaddr_t)hpmp;
 294         hpmp->hpm_devvp = devvp;
 295         hpmp->hpm_dev = dev;
 296         hpmp->hpm_mp = mp;
 297         hpmp->hpm_uid = argsp->uid;
 298         hpmp->hpm_gid = argsp->gid;
 299         hpmp->hpm_mode = argsp->mode;
 300
 301         error = hpfs_bminit(hpmp);
 302         if (error)
 303                 goto failed;
 304
 305         error = hpfs_cpinit(hpmp, argsp);
 306         if (error) {
 307                 hpfs_bmdeinit(hpmp);
 308                 goto failed;
 309         }
 310         vfs_add_vnodeops(mp, &hpfs_vnode_vops, &mp->mnt_vn_norm_ops);
 311
 312         error = hpfs_root(mp, &vp);
 313         if (error) {
 314                 hpfs_cpdeinit(hpmp);
 315                 hpfs_bmdeinit(hpmp);
 316                 goto failed;
 317         }
 318
 319         vput(vp);
 320
 321         mp->mnt_stat.f_fsid.val[0] = (long)devid_from_dev(dev);
 322         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
 323         mp->mnt_maxsymlinklen = 0;
 324         mp->mnt_flag |= MNT_LOCAL;
 325         dev->si_mountpoint = mp;
 326         return (0);
 327
 328 failed:
 329         if (bp)
 330                 brelse (bp);
 331         mp->mnt_data = NULL;
 332         dev->si_mountpoint = NULL;
 333         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 334         VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NULL);
 335         vn_unlock(devvp);
 336         return (error);
 337 }
 338
 339
 340 static int
 341 hpfs_unmount(struct mount *mp, int mntflags)
 342 {
 343         int error, flags, ronly;
 344         struct hpfsmount *hpmp = VFSTOHPFS(mp);
 345
 346         dprintf(("hpfs_unmount():\n"));
 347
 348         ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
 349
 350         flags = 0;
 351         if(mntflags & MNT_FORCE)
 352                 flags |= FORCECLOSE;
 353
 354         dprintf(("hpfs_unmount: vflushing...\n"));
 355
 356         error = vflush(mp, 0, flags);
 357         if (error) {
 358                 kprintf("hpfs_unmount: vflush failed: %d\n",error);
 359                 return (error);
 360         }
 361
 362         hpmp->hpm_devvp->v_rdev->si_mountpoint = NULL;
 363
 364         vn_lock(hpmp->hpm_devvp, LK_EXCLUSIVE | LK_RETRY);
 365         vinvalbuf(hpmp->hpm_devvp, V_SAVE, 0, 0);
 366         error = VOP_CLOSE(hpmp->hpm_devvp, ronly ? FREAD : FREAD|FWRITE, NULL);
 367         vn_unlock(hpmp->hpm_devvp);
 368
 369         vrele(hpmp->hpm_devvp);
 370
 371         dprintf(("hpfs_umount: freeing memory...\n"));
 372         hpfs_cpdeinit(hpmp);
 373         hpfs_bmdeinit(hpmp);
 374         mp->mnt_data = (qaddr_t)0;
 375         mp->mnt_flag &= ~MNT_LOCAL;
 376         kfree(hpmp, M_HPFSMNT);
 377
 378         return (0);
 379 }
 380
 381 static int
 382 hpfs_root(struct mount *mp, struct vnode **vpp)
 383 {
 384         int error = 0;
 385         struct hpfsmount *hpmp = VFSTOHPFS(mp);
 386
 387         dprintf(("hpfs_root():\n"));
 388         error = VFS_VGET(mp, NULL, (ino_t)hpmp->hpm_su.su_rootfno, vpp);
 389         if(error) {
 390                 kprintf("hpfs_root: VFS_VGET failed: %d\n",error);
 391                 return (error);
 392         }
 393
 394         return (error);
 395 }
 396
 397 static int
 398 hpfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 399 {
 400         struct hpfsmount *hpmp = VFSTOHPFS(mp);
 401
 402         dprintf(("hpfs_statfs(): HPFS%d.%d\n",
 403                 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
 404
 405         sbp->f_type = mp->mnt_vfc->vfc_typenum;
 406         sbp->f_bsize = DEV_BSIZE;
 407         sbp->f_iosize = DEV_BSIZE;
 408         sbp->f_blocks = hpmp->hpm_su.su_btotal;
 409         sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
 410         sbp->f_ffree = 0;
 411         sbp->f_files = 0;
 412         if (sbp != &mp->mnt_stat) {
 413                 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
 414                         (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
 415         }
 416         sbp->f_flags = mp->mnt_flag;
 417
 418         return (0);
 419 }
 420
 421
 422 /*ARGSUSED*/
 423 static int
 424 hpfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 425             struct fid *fhp, 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, NULL, hpfhp->hpfid_ino, &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(struct vnode *vp, struct fid *fhp)
 444 {
 445         struct hpfsnode *hpp;
 446         struct hpfid *hpfhp;
 447
 448         hpp = VTOHP(vp);
 449         hpfhp = (struct hpfid *)fhp;
 450         hpfhp->hpfid_len = sizeof(struct hpfid);
 451         hpfhp->hpfid_ino = hpp->h_no;
 452         /* hpfhp->hpfid_gen = hpp->h_gen; */
 453         return (0);
 454 }
 455
 456 static int
 457 hpfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
 458 {
 459         struct hpfsmount *hpmp = VFSTOHPFS(mp);
 460         struct vnode *vp;
 461         struct hpfsnode *hp;
 462         struct buf *bp;
 463         int error;
 464
 465         dprintf(("hpfs_vget(0x%jx): ", ino));
 466
 467         *vpp = NULL;
 468         hp = NULL;
 469         vp = NULL;
 470
 471         if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino)) != NULL) {
 472                 dprintf(("hashed\n"));
 473                 return (0);
 474         }
 475
 476         /*
 477          * We have to lock node creation for a while,
 478          * but then we have to call getnewvnode(),
 479          * this may cause hpfs_reclaim() to be called,
 480          * this may need to VOP_VGET() parent dir for
 481          * update reasons, and if parent is not in
 482          * hash, we have to lock node creation...
 483          * To solve this, we MALLOC, getnewvnode and init while
 484          * not locked (probability of node appearence
 485          * at that time is little, and anyway - we'll
 486          * check for it).
 487          */
 488         hp = kmalloc(sizeof(struct hpfsnode), M_HPFSNO, M_WAITOK);
 489
 490         error = getnewvnode(VT_HPFS, hpmp->hpm_mp, &vp, VLKTIMEOUT, 0);
 491         if (error) {
 492                 kprintf("hpfs_vget: can't get new vnode\n");
 493                 kfree(hp, M_HPFSNO);
 494                 return (error);
 495         }
 496
 497         dprintf(("prenew "));
 498
 499         vp->v_data = hp;
 500
 501         if (ino == (ino_t)hpmp->hpm_su.su_rootfno)
 502                 vsetflags(vp, VROOT);
 503
 504         lwkt_token_init(&hp->h_interlock, "hpfsilock");
 505
 506         hp->h_flag = H_INVAL;
 507         hp->h_vp = vp;
 508         hp->h_hpmp = hpmp;
 509         hp->h_no = ino;
 510         hp->h_dev = hpmp->hpm_dev;
 511         hp->h_uid = hpmp->hpm_uid;
 512         hp->h_gid = hpmp->hpm_uid;
 513         hp->h_mode = hpmp->hpm_mode;
 514         hp->h_devvp = hpmp->hpm_devvp;
 515         vref(hp->h_devvp);
 516
 517         do {
 518                 if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino)) != NULL) {
 519                         dprintf(("hashed2\n"));
 520                         vx_put(vp);
 521                         return (0);
 522                 }
 523         } while (LOCKMGR(&hpfs_hphash_lock, LK_EXCLUSIVE | LK_SLEEPFAIL));
 524
 525         hpfs_hphashins(hp);
 526
 527         LOCKMGR(&hpfs_hphash_lock, LK_RELEASE);
 528
 529         error = bread(hpmp->hpm_devvp, dbtodoff(ino), FNODESIZE, &bp);
 530         if (error) {
 531                 kprintf("hpfs_vget: can't read ino %"PRId64"\n",ino);
 532                 vx_put(vp);
 533                 return (error);
 534         }
 535         bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
 536         brelse(bp);
 537
 538         if (hp->h_fn.fn_magic != FN_MAGIC) {
 539                 kprintf("hpfs_vget: MAGIC DOESN'T MATCH\n");
 540                 vx_put(vp);
 541                 return (EINVAL);
 542         }
 543
 544         vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
 545         hp->h_flag &= ~H_INVAL;
 546
 547         /* Return the locked and refd vnode */
 548         vx_downgrade(vp);
 549         *vpp = vp;
 550
 551         return (0);
 552 }
 553
 554 static struct vfsops hpfs_vfsops = {
 555         .vfs_flags =            0,
 556         .vfs_mount =            hpfs_mount,
 557         .vfs_unmount =          hpfs_unmount,
 558         .vfs_root =             hpfs_root,
 559         .vfs_statfs =           hpfs_statfs,
 560         .vfs_vget =             hpfs_vget,
 561         .vfs_fhtovp =           hpfs_fhtovp,
 562         .vfs_checkexp =         hpfs_checkexp,
 563         .vfs_vptofh =           hpfs_vptofh,
 564         .vfs_init =             hpfs_init,
 565         .vfs_uninit =           hpfs_hphash_uninit
 566 };
 567
 568 VFS_SET(hpfs_vfsops, hpfs, 0);
 569 MODULE_VERSION(hpfs, 1);