src/sys/vfs/hpfs/hpfs_vfsops.c - view

File: [DragonFly] / src / sys / vfs / hpfs / hpfs_vfsops.c
Revision 1.16: download - view: text, annotated - select for diffs
Wed May 19 22:53:04 2004 UTC (9 years ago) by dillon
Branches: MAIN
CVS tags: HEAD

Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

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: * $DragonFly: src/sys/vfs/hpfs/hpfs_vfsops.c,v 1.16 2004/05/19 22:53:04 dillon Exp $ 28: */ 29: 30: 31: #include <sys/param.h> 32: #include <sys/systm.h> 33: #include <sys/namei.h> 34: #include <sys/conf.h> 35: #include <sys/proc.h> 36: #include <sys/kernel.h> 37: #include <sys/vnode.h> 38: #include <sys/mount.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: #if defined(__NetBSD__) 46: #include <vm/vm_prot.h> 47: #endif 48: #include <vm/vm_page.h> 49: #include <vm/vm_object.h> 50: #include <vm/vm_extern.h> 51: #include <sys/buf2.h> 52: 53: #if defined(__NetBSD__) 54: #include <miscfs/specfs/specdev.h> 55: #endif 56: 57: #include "hpfs.h" 58: #include "hpfsmount.h" 59: #include "hpfs_subr.h" 60: 61: #if defined(__DragonFly__) 62: MALLOC_DEFINE(M_HPFSMNT, "HPFS mount", "HPFS mount structure"); 63: MALLOC_DEFINE(M_HPFSNO, "HPFS node", "HPFS node structure"); 64: #endif 65: 66: static int hpfs_root (struct mount *, struct vnode **); 67: static int hpfs_statfs (struct mount *, struct statfs *, 68: struct thread *); 69: static int hpfs_unmount (struct mount *, int, struct thread *); 70: static int hpfs_vget (struct mount *mp, ino_t ino, 71: struct vnode **vpp); 72: static int hpfs_mountfs (struct vnode *, struct mount *, 73: struct hpfs_args *, struct thread *); 74: static int hpfs_vptofh (struct vnode *, struct fid *); 75: static int hpfs_fhtovp (struct mount *, struct fid *, 76: struct vnode **); 77: 78: #if !defined(__DragonFly__) 79: static int hpfs_quotactl (struct mount *, int, uid_t, caddr_t, 80: struct proc *); 81: static int hpfs_start (struct mount *, int, struct proc *); 82: static int hpfs_sync (struct mount *, int, struct ucred *, 83: struct proc *); 84: #endif 85: 86: #if defined(__DragonFly__) 87: struct sockaddr; 88: static int hpfs_mount (struct mount *, char *, caddr_t, 89: struct nameidata *, struct thread *); 90: static int hpfs_init (struct vfsconf *); 91: static int hpfs_checkexp (struct mount *, struct sockaddr *, 92: int *, struct ucred **); 93: #else /* defined(__NetBSD__) */ 94: static int hpfs_mount (struct mount *, const char *, void *, 95: struct nameidata *, struct proc *); 96: static void hpfs_init (void); 97: static int hpfs_mountroot (void); 98: static int hpfs_sysctl (int *, u_int, void *, size_t *, void *, 99: size_t, struct proc *); 100: static int hpfs_checkexp (struct mount *, struct mbuf *, 101: int *, struct ucred **); 102: #endif 103: 104: /*ARGSUSED*/ 105: static int 106: hpfs_checkexp(struct mount *mp, 107: #if defined(__DragonFly__) 108: struct sockaddr *nam, 109: #else /* defined(__NetBSD__) */ 110: struct mbuf *nam, 111: #endif 112: int *exflagsp, struct ucred **credanonp) 113: { 114: struct netcred *np; 115: struct hpfsmount *hpm = VFSTOHPFS(mp); 116: 117: /* 118: * Get the export permission structure for this <mp, client> tuple. 119: */ 120: np = vfs_export_lookup(mp, &hpm->hpm_export, nam); 121: if (np == NULL) 122: return (EACCES); 123: 124: *exflagsp = np->netc_exflags; 125: *credanonp = &np->netc_anon; 126: return (0); 127: } 128: 129: #if !defined(__DragonFly__) 130: /*ARGSUSED*/ 131: static int 132: hpfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 133: size_t newlen, struct thread *td) 134: { 135: return (EINVAL); 136: } 137: 138: static int 139: hpfs_mountroot(void) 140: { 141: return (EINVAL); 142: } 143: #endif 144: 145: #if defined(__DragonFly__) 146: static int 147: hpfs_init(struct vfsconf *vcp) 148: #else /* defined(__NetBSD__) */ 149: static void 150: hpfs_init(void) 151: #endif 152: { 153: dprintf(("hpfs_init():\n")); 154: 155: hpfs_hphashinit(); 156: #if defined(__DragonFly__) 157: return 0; 158: #endif 159: } 160: 161: static int 162: hpfs_mount(struct mount *mp, 163: #if defined(__DragonFly__) 164: char *path, caddr_t data, 165: #else /* defined(__NetBSD__) */ 166: const char *path, void *data, 167: #endif 168: struct nameidata *ndp, struct thread *td) 169: { 170: u_int size; 171: int err = 0; 172: struct vnode *devvp; 173: struct hpfs_args args; 174: struct hpfsmount *hpmp = 0; 175: 176: dprintf(("hpfs_mount():\n")); 177: /* 178: *** 179: * Mounting non-root file system or updating a file system 180: *** 181: */ 182: 183: /* copy in user arguments*/ 184: err = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args)); 185: if (err) 186: goto error_1; /* can't get arguments*/ 187: 188: /* 189: * If updating, check whether changing from read-only to 190: * read/write; if there is no device name, that's all we do. 191: */ 192: if (mp->mnt_flag & MNT_UPDATE) { 193: dprintf(("hpfs_mount: MNT_UPDATE: ")); 194: 195: hpmp = VFSTOHPFS(mp); 196: 197: if (args.fspec == 0) { 198: dprintf(("export 0x%x\n",args.export.ex_flags)); 199: err = vfs_export(mp, &hpmp->hpm_export, &args.export); 200: if (err) { 201: printf("hpfs_mount: vfs_export failed %d\n", 202: err); 203: } 204: goto success; 205: } else { 206: dprintf(("name [FAILED]\n")); 207: err = EINVAL; 208: goto success; 209: } 210: dprintf(("\n")); 211: } 212: 213: /* 214: * Not an update, or updating the name: look up the name 215: * and verify that it refers to a sensible block device. 216: */ 217: NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, args.fspec, td); 218: err = namei(ndp); 219: if (err) { 220: /* can't get devvp!*/ 221: goto error_1; 222: } 223: 224: devvp = ndp->ni_vp; 225: 226: #if defined(__DragonFly__) 227: if (!vn_isdisk(devvp, &err)) 228: goto error_2; 229: #else /* defined(__NetBSD__) */ 230: if (devvp->v_type != VBLK) { 231: err = ENOTBLK; 232: goto error_2; 233: } 234: if (umajor(devvp->v_udev) >= nblkdev) { 235: err = ENXIO; 236: goto error_2; 237: } 238: #endif 239: 240: /* 241: ******************** 242: * NEW MOUNT 243: ******************** 244: */ 245: 246: /* 247: * Since this is a new mount, we want the names for 248: * the device and the mount point copied in. If an 249: * error occurs, the mountpoint is discarded by the 250: * upper level code. 251: */ 252: /* Save "last mounted on" info for mount point (NULL pad)*/ 253: copyinstr( path, /* mount point*/ 254: mp->mnt_stat.f_mntonname, /* save area*/ 255: MNAMELEN - 1, /* max size*/ 256: &size); /* real size*/ 257: bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 258: 259: /* Save "mounted from" info for mount point (NULL pad)*/ 260: copyinstr( args.fspec, /* device name*/ 261: mp->mnt_stat.f_mntfromname, /* save area*/ 262: MNAMELEN - 1, /* max size*/ 263: &size); /* real size*/ 264: bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 265: 266: err = hpfs_mountfs(devvp, mp, &args, td); 267: if (err) 268: goto error_2; 269: 270: /* 271: * Initialize FS stat information in mount struct; uses both 272: * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname 273: * 274: * This code is common to root and non-root mounts 275: */ 276: (void)VFS_STATFS(mp, &mp->mnt_stat, td); 277: 278: goto success; 279: 280: 281: error_2: /* error with devvp held*/ 282: 283: /* release devvp before failing*/ 284: vrele(devvp); 285: 286: error_1: /* no state to back out*/ 287: 288: success: 289: return( err); 290: } 291: 292: /* 293: * Common code for mount and mountroot 294: */ 295: int 296: hpfs_mountfs(struct vnode *devvp, struct mount *mp, struct hpfs_args *argsp, 297: struct thread *td) 298: { 299: int error, ncount, ronly; 300: struct sublock *sup; 301: struct spblock *spp; 302: struct hpfsmount *hpmp; 303: struct buf *bp = NULL; 304: struct vnode *vp; 305: dev_t dev; 306: 307: dprintf(("hpfs_mountfs():\n")); 308: /* 309: * Disallow multiple mounts of the same device. 310: * Disallow mounting of a device that is currently in use 311: * (except for root, which might share swap device for miniroot). 312: * Flush out any old buffers remaining from a previous use. 313: */ 314: error = vfs_mountedon(devvp); 315: if (error) 316: return (error); 317: ncount = count_udev(devvp); 318: #if defined(__DragonFly__) 319: if (devvp->v_object) 320: ncount -= 1; 321: #endif 322: if (ncount > 0 && devvp != rootvp) 323: return (EBUSY); 324: 325: #if defined(__DragonFly__) 326: VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY, td); 327: error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 328: VOP__UNLOCK(devvp, 0, td); 329: #else 330: error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 331: #endif 332: if (error) 333: return (error); 334: 335: ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 336: VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY, td); 337: error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 338: VOP__UNLOCK(devvp, 0, td); 339: if (error) 340: return (error); 341: dev = devvp->v_rdev; 342: 343: /* 344: * Do actual mount 345: */ 346: hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK); 347: bzero(hpmp, sizeof(struct hpfsmount)); 348: 349: /* Read in SuperBlock */ 350: error = bread(devvp, SUBLOCK, SUSIZE, &bp); 351: if (error) 352: goto failed; 353: bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock)); 354: brelse(bp); bp = NULL; 355: 356: /* Read in SpareBlock */ 357: error = bread(devvp, SPBLOCK, SPSIZE, &bp); 358: if (error) 359: goto failed; 360: bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock)); 361: brelse(bp); bp = NULL; 362: 363: sup = &hpmp->hpm_su; 364: spp = &hpmp->hpm_sp; 365: 366: /* Check magic */ 367: if (sup->su_magic != SU_MAGIC) { 368: printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n"); 369: error = EINVAL; 370: goto failed; 371: } 372: if (spp->sp_magic != SP_MAGIC) { 373: printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n"); 374: error = EINVAL; 375: goto failed; 376: } 377: 378: mp->mnt_data = (qaddr_t)hpmp; 379: hpmp->hpm_devvp = devvp; 380: hpmp->hpm_dev = dev; 381: hpmp->hpm_mp = mp; 382: hpmp->hpm_uid = argsp->uid; 383: hpmp->hpm_gid = argsp->gid; 384: hpmp->hpm_mode = argsp->mode; 385: 386: error = hpfs_bminit(hpmp); 387: if (error) 388: goto failed; 389: 390: error = hpfs_cpinit(hpmp, argsp); 391: if (error) { 392: hpfs_bmdeinit(hpmp); 393: goto failed; 394: } 395: 396: error = hpfs_root(mp, &vp); 397: if (error) { 398: hpfs_cpdeinit(hpmp); 399: hpfs_bmdeinit(hpmp); 400: goto failed; 401: } 402: 403: vput(vp); 404: 405: #if defined(__DragonFly__) 406: mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev); 407: mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 408: #else 409: mp->mnt_stat.f_fsid.val[0] = (long)dev; 410: mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_HPFS); 411: #endif 412: mp->mnt_maxsymlinklen = 0; 413: mp->mnt_flag |= MNT_LOCAL; 414: dev->si_mountpoint = mp; 415: return (0); 416: 417: failed: 418: if (bp) 419: brelse (bp); 420: mp->mnt_data = (qaddr_t)NULL; 421: #if defined(__DragonFly__) 422: dev->si_mountpoint = NULL; 423: #else 424: devvp->v_specflags &= ~SI_MOUNTEDON; 425: #endif 426: (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td); 427: return (error); 428: } 429: 430: #if !defined(__DragonFly__) 431: static int 432: hpfs_start(struct mount *mp, int flags, struct thread *td) 433: { 434: return (0); 435: } 436: #endif 437: 438: static int 439: hpfs_unmount(struct mount *mp, int mntflags, struct thread *td) 440: { 441: int error, flags, ronly; 442: struct hpfsmount *hpmp = VFSTOHPFS(mp); 443: 444: dprintf(("hpfs_unmount():\n")); 445: 446: ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 447: 448: flags = 0; 449: if(mntflags & MNT_FORCE) 450: flags |= FORCECLOSE; 451: 452: dprintf(("hpfs_unmount: vflushing...\n")); 453: 454: error = vflush(mp, 0, flags); 455: if (error) { 456: printf("hpfs_unmount: vflush failed: %d\n",error); 457: return (error); 458: } 459: 460: #if defined(__DragonFly__) 461: hpmp->hpm_devvp->v_rdev->si_mountpoint = NULL; 462: #else 463: hpmp->hpm_devvp->v_specflags &= ~SI_MOUNTEDON; 464: #endif 465: 466: vinvalbuf(hpmp->hpm_devvp, V_SAVE, td, 0, 0); 467: error = VOP_CLOSE(hpmp->hpm_devvp, ronly ? FREAD : FREAD|FWRITE, td); 468: 469: vrele(hpmp->hpm_devvp); 470: 471: dprintf(("hpfs_umount: freeing memory...\n")); 472: hpfs_cpdeinit(hpmp); 473: hpfs_bmdeinit(hpmp); 474: mp->mnt_data = (qaddr_t)0; 475: mp->mnt_flag &= ~MNT_LOCAL; 476: FREE(hpmp, M_HPFSMNT); 477: 478: return (0); 479: } 480: 481: static int 482: hpfs_root(struct mount *mp, struct vnode **vpp) 483: { 484: int error = 0; 485: struct hpfsmount *hpmp = VFSTOHPFS(mp); 486: 487: dprintf(("hpfs_root():\n")); 488: error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, vpp); 489: if(error) { 490: printf("hpfs_root: VFS_VGET failed: %d\n",error); 491: return (error); 492: } 493: 494: return (error); 495: } 496: 497: static int 498: hpfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 499: { 500: struct hpfsmount *hpmp = VFSTOHPFS(mp); 501: 502: dprintf(("hpfs_statfs(): HPFS%d.%d\n", 503: hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver)); 504: 505: #if defined(__DragonFly__) 506: sbp->f_type = mp->mnt_vfc->vfc_typenum; 507: #else /* defined(__NetBSD__) */ 508: sbp->f_type = 0; 509: #endif 510: sbp->f_bsize = DEV_BSIZE; 511: sbp->f_iosize = DEV_BSIZE; 512: sbp->f_blocks = hpmp->hpm_su.su_btotal; 513: sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail; 514: sbp->f_ffree = 0; 515: sbp->f_files = 0; 516: if (sbp != &mp->mnt_stat) { 517: bcopy((caddr_t)mp->mnt_stat.f_mntonname, 518: (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 519: bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 520: (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 521: } 522: sbp->f_flags = mp->mnt_flag; 523: 524: return (0); 525: } 526: 527: #if !defined(__DragonFly__) 528: static int 529: hpfs_sync(struct mount *mp, int waitfor, struct ucred *cred, 530: struct thread *td) 531: { 532: return (0); 533: } 534: 535: static int 536: hpfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 537: struct thread *td) 538: { 539: printf("hpfs_quotactl():\n"); 540: return (EOPNOTSUPP); 541: } 542: #endif 543: 544: /*ARGSUSED*/ 545: static int 546: hpfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 547: { 548: struct vnode *nvp; 549: struct hpfid *hpfhp = (struct hpfid *)fhp; 550: int error; 551: 552: if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, &nvp)) != 0) { 553: *vpp = NULLVP; 554: return (error); 555: } 556: /* XXX as unlink/rmdir/mkdir/creat are not currently possible 557: * with HPFS, we don't need to check anything else for now */ 558: *vpp = nvp; 559: 560: return (0); 561: } 562: 563: static int 564: hpfs_vptofh(struct vnode *vp, struct fid *fhp) 565: { 566: struct hpfsnode *hpp; 567: struct hpfid *hpfhp; 568: 569: hpp = VTOHP(vp); 570: hpfhp = (struct hpfid *)fhp; 571: hpfhp->hpfid_len = sizeof(struct hpfid); 572: hpfhp->hpfid_ino = hpp->h_no; 573: /* hpfhp->hpfid_gen = hpp->h_gen; */ 574: return (0); 575: } 576: 577: static int 578: hpfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 579: { 580: struct hpfsmount *hpmp = VFSTOHPFS(mp); 581: struct vnode *vp; 582: struct hpfsnode *hp; 583: struct buf *bp; 584: struct thread *td = curthread; /* XXX */ 585: int error; 586: 587: dprintf(("hpfs_vget(0x%x): ",ino)); 588: 589: *vpp = NULL; 590: hp = NULL; 591: vp = NULL; 592: 593: if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino, td)) != NULL) { 594: dprintf(("hashed\n")); 595: return (0); 596: } 597: 598: /* 599: * We have to lock node creation for a while, 600: * but then we have to call getnewvnode(), 601: * this may cause hpfs_reclaim() to be called, 602: * this may need to VOP_VGET() parent dir for 603: * update reasons, and if parent is not in 604: * hash, we have to lock node creation... 605: * To solve this, we MALLOC, getnewvnode and init while 606: * not locked (probability of node appearence 607: * at that time is little, and anyway - we'll 608: * check for it). 609: */ 610: MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode), 611: M_HPFSNO, M_WAITOK); 612: 613: error = getnewvnode(VT_HPFS, hpmp->hpm_mp, hpfs_vnodeop_p, &vp); 614: if (error) { 615: printf("hpfs_vget: can't get new vnode\n"); 616: FREE(hp, M_HPFSNO); 617: return (error); 618: } 619: 620: dprintf(("prenew ")); 621: 622: vp->v_data = hp; 623: 624: if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 625: vp->v_flag |= VROOT; 626: 627: lwkt_token_init(&hp->h_interlock); 628: lockinit(&hp->h_lock, 0, "hpnode", VLKTIMEOUT, 0); 629: 630: hp->h_flag = H_INVAL; 631: hp->h_vp = vp; 632: hp->h_hpmp = hpmp; 633: hp->h_no = ino; 634: hp->h_dev = hpmp->hpm_dev; 635: hp->h_uid = hpmp->hpm_uid; 636: hp->h_gid = hpmp->hpm_uid; 637: hp->h_mode = hpmp->hpm_mode; 638: hp->h_devvp = hpmp->hpm_devvp; 639: vref(hp->h_devvp); 640: 641: error = VN_LOCK(vp, LK_EXCLUSIVE, td); 642: if (error) { 643: vput(vp); 644: return (error); 645: } 646: 647: do { 648: if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino, td)) != NULL) { 649: dprintf(("hashed2\n")); 650: vput(vp); 651: return (0); 652: } 653: } while(LOCKMGR(&hpfs_hphash_lock,LK_EXCLUSIVE|LK_SLEEPFAIL,NULL,NULL)); 654: 655: hpfs_hphashins(hp); 656: 657: LOCKMGR(&hpfs_hphash_lock, LK_RELEASE, NULL, NULL); 658: 659: error = bread(hpmp->hpm_devvp, ino, FNODESIZE, &bp); 660: if (error) { 661: printf("hpfs_vget: can't read ino %d\n",ino); 662: vput(vp); 663: return (error); 664: } 665: bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode)); 666: brelse(bp); 667: 668: if (hp->h_fn.fn_magic != FN_MAGIC) { 669: printf("hpfs_vget: MAGIC DOESN'T MATCH\n"); 670: vput(vp); 671: return (EINVAL); 672: } 673: 674: vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG; 675: hp->h_flag &= ~H_INVAL; 676: 677: *vpp = vp; 678: 679: return (0); 680: } 681: 682: #if defined(__DragonFly__) 683: static struct vfsops hpfs_vfsops = { 684: hpfs_mount, 685: vfs_stdstart, 686: hpfs_unmount, 687: hpfs_root, 688: vfs_stdquotactl, 689: hpfs_statfs, 690: vfs_stdsync, 691: hpfs_vget, 692: hpfs_fhtovp, 693: hpfs_checkexp, 694: hpfs_vptofh, 695: hpfs_init, 696: hpfs_hphash_uninit, 697: vfs_stdextattrctl, 698: }; 699: VFS_SET(hpfs_vfsops, hpfs, 0); 700: #else /* defined(__NetBSD__) */ 701: extern struct vnodeopv_desc hpfs_vnodeop_opv_desc; 702: 703: struct vnodeopv_desc *hpfs_vnodeopv_descs[] = { 704: &hpfs_vnodeop_opv_desc, 705: NULL, 706: }; 707: 708: struct vfsops hpfs_vfsops = { 709: MOUNT_HPFS, 710: hpfs_mount, 711: hpfs_start, 712: hpfs_unmount, 713: hpfs_root, 714: hpfs_quotactl, 715: hpfs_statfs, 716: hpfs_sync, 717: hpfs_vget, 718: hpfs_fhtovp, 719: hpfs_vptofh, 720: hpfs_init, 721: hpfs_sysctl, 722: hpfs_mountroot, 723: hpfs_checkexp, 724: hpfs_vnodeopv_descs, 725: }; 726: #endif