sys/fs/v7fs/v7fs_vfsops.c

   1 /*      $NetBSD: v7fs_vfsops.c,v 1.12 2014/12/29 15:29:38 hannken Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2004, 2011 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by UCHIYAMA Yasushi.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: v7fs_vfsops.c,v 1.12 2014/12/29 15:29:38 hannken Exp $");
  34 #if defined _KERNEL_OPT
  35 #include "opt_v7fs.h"
  36 #endif
  37
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/pool.h>
  42 #include <sys/time.h>
  43 #include <sys/ucred.h>
  44 #include <sys/mount.h>
  45 #include <sys/disk.h>
  46 #include <sys/device.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/kmem.h>
  49 #include <sys/kauth.h>
  50 #include <sys/proc.h>
  51
  52 /* v-node */
  53 #include <sys/namei.h>
  54 #include <sys/vnode.h>
  55 /* devsw */
  56 #include <sys/conf.h>
  57
  58 #include "v7fs_extern.h"
  59 #include "v7fs.h"
  60 #include "v7fs_impl.h"
  61 #include "v7fs_inode.h"
  62 #include "v7fs_superblock.h"
  63
  64 #ifdef V7FS_VFSOPS_DEBUG
  65 #define DPRINTF(fmt, args...)   printf("%s: " fmt, __func__, ##args)
  66 #else
  67 #define DPRINTF(arg...)         ((void)0)
  68 #endif
  69
  70 struct pool v7fs_node_pool;
  71
  72 static int v7fs_mountfs(struct vnode *, struct mount *, int);
  73 static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
  74 static void v7fs_closefs(struct vnode *, struct mount *);
  75 static int is_v7fs_partition(struct vnode *);
  76 static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
  77
  78 int
  79 v7fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
  80 {
  81         struct lwp *l = curlwp;
  82         struct v7fs_args *args = data;
  83         struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
  84         struct vnode *devvp = NULL;
  85         int error = 0;
  86         bool update = mp->mnt_flag & MNT_UPDATE;
  87
  88         DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
  89
  90         if (args == NULL)
  91                 return EINVAL;
  92         if (*data_len < sizeof(*args))
  93                 return EINVAL;
  94
  95         if (mp->mnt_flag & MNT_GETARGS) {
  96                 if (!v7fsmount)
  97                         return EIO;
  98                 args->fspec = NULL;
  99                 args->endian = v7fsmount->core->endian;
 100                 *data_len = sizeof(*args);
 101                 return 0;
 102         }
 103
 104         DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
 105         if (args->fspec == NULL) {
 106                 /* nothing to do. */
 107                 return EINVAL;
 108         }
 109
 110         if (args->fspec != NULL) {
 111                 /* Look up the name and verify that it's sane. */
 112                 error = namei_simple_user(args->fspec,
 113                     NSM_FOLLOW_NOEMULROOT, &devvp);
 114                 if (error != 0)
 115                         return (error);
 116                 DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
 117
 118                 if (!update) {
 119                         /*
 120                          * Be sure this is a valid block device
 121                          */
 122                         if (devvp->v_type != VBLK)
 123                                 error = ENOTBLK;
 124                         else if (bdevsw_lookup(devvp->v_rdev) == NULL)
 125                                 error = ENXIO;
 126                 } else {
 127                         KDASSERT(v7fsmount);
 128                         /*
 129                          * Be sure we're still naming the same device
 130                          * used for our initial mount
 131                          */
 132                         if (devvp != v7fsmount->devvp) {
 133                                 DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
 134                                     v7fsmount->devvp, rootvp);
 135                                 if (rootvp == v7fsmount->devvp) {
 136                                         vrele(devvp);
 137                                         devvp = rootvp;
 138                                         vref(devvp);
 139                                 } else {
 140                                         error = EINVAL;
 141                                 }
 142                         }
 143                 }
 144         }
 145
 146         /*
 147          * If mount by non-root, then verify that user has necessary
 148          * permissions on the device.
 149          *
 150          * Permission to update a mount is checked higher, so here we presume
 151          * updating the mount is okay (for example, as far as securelevel goes)
 152          * which leaves us with the normal check.
 153          */
 154         if (error == 0) {
 155                 int accessmode = VREAD;
 156                 if (update ?
 157                     (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
 158                     (mp->mnt_flag & MNT_RDONLY) == 0)
 159                         accessmode |= VWRITE;
 160                 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
 161                     KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
 162                     KAUTH_ARG(accessmode));
 163         }
 164
 165         if (error) {
 166                 vrele(devvp);
 167                 return error;
 168         }
 169
 170         if (!update) {
 171                 if ((error = v7fs_openfs(devvp, mp, l))) {
 172                         vrele(devvp);
 173                         return error;
 174                 }
 175
 176                 if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
 177                         v7fs_closefs(devvp, mp);
 178                         VOP_UNLOCK(devvp);
 179                         vrele(devvp);
 180                         return error;
 181                 }
 182                 VOP_UNLOCK(devvp);
 183         } else  if (mp->mnt_flag & MNT_RDONLY) {
 184                 /* XXX: r/w -> read only */
 185         }
 186
 187         return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
 188             mp->mnt_op->vfs_name, mp, l);
 189 }
 190
 191 static int
 192 is_v7fs_partition(struct vnode *devvp)
 193 {
 194         struct dkwedge_info dkw;
 195         int error;
 196
 197         if ((error = getdiskinfo(devvp, &dkw)) != 0) {
 198                 DPRINTF("getdiskinfo=%d\n", error);
 199                 return error;
 200         }
 201         DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw->dkw_size);
 202
 203         return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
 204 }
 205
 206 static int
 207 v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
 208 {
 209         kauth_cred_t cred = l->l_cred;
 210         int oflags;
 211         int error;
 212
 213         /* Flush buffer */
 214         vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 215         if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
 216                 goto unlock_exit;
 217
 218         /* Open block device */
 219         oflags = FREAD;
 220         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 221                 oflags |= FWRITE;
 222
 223         if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
 224                 DPRINTF("VOP_OPEN=%d\n", error);
 225                 goto unlock_exit;
 226         }
 227
 228         return 0; /* lock held */
 229
 230 unlock_exit:
 231         VOP_UNLOCK(devvp);
 232
 233         return error;
 234 }
 235
 236 static void
 237 v7fs_closefs(struct vnode *devvp, struct mount *mp)
 238 {
 239         int oflags = FREAD;
 240
 241         if ((mp->mnt_flag & MNT_RDONLY) == 0)
 242                 oflags |= FWRITE;
 243
 244         VOP_CLOSE(devvp, oflags, NOCRED);
 245 }
 246
 247 static int
 248 v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
 249 {
 250         struct v7fs_mount *v7fsmount;
 251         int error;
 252         struct v7fs_mount_device mount;
 253
 254         DPRINTF("%d\n",endian);
 255
 256         v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
 257         if (v7fsmount == NULL) {
 258                 return ENOMEM;
 259         }
 260         v7fsmount->devvp = devvp;
 261         v7fsmount->mountp = mp;
 262
 263         mount.device.vnode = devvp;
 264         mount.endian = endian;
 265
 266         if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
 267                 goto err_exit;
 268         }
 269         struct v7fs_self *fs = v7fsmount->core;
 270
 271         if ((error = v7fs_superblock_load(fs))) {
 272                 v7fs_io_fini(fs);
 273                 goto err_exit;
 274         }
 275
 276         mp->mnt_data = v7fsmount;
 277         mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
 278         mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
 279         mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
 280         mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
 281         mp->mnt_flag |= MNT_LOCAL;
 282         mp->mnt_dev_bshift = V7FS_BSHIFT;
 283         mp->mnt_fs_bshift = V7FS_BSHIFT;
 284
 285         return 0;
 286
 287 err_exit:
 288         kmem_free(v7fsmount, sizeof(*v7fsmount));
 289         return error;
 290 }
 291
 292 int
 293 v7fs_start(struct mount *mp, int flags)
 294 {
 295
 296         DPRINTF("\n");
 297         /* Nothing to do. */
 298         return 0;
 299 }
 300
 301 int
 302 v7fs_unmount(struct mount *mp, int mntflags)
 303 {
 304         struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
 305         int error;
 306
 307         DPRINTF("%p\n", v7fsmount);
 308
 309         if ((error = vflush(mp, NULLVP,
 310                     mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
 311                 return error;
 312
 313         vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
 314         error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
 315         vput(v7fsmount->devvp);
 316
 317         v7fs_io_fini(v7fsmount->core);
 318
 319         kmem_free(v7fsmount, sizeof(*v7fsmount));
 320         mp->mnt_data = NULL;
 321         mp->mnt_flag &= ~MNT_LOCAL;
 322
 323         return 0;
 324 }
 325
 326 int
 327 v7fs_root(struct mount *mp, struct vnode **vpp)
 328 {
 329         struct vnode *vp;
 330         int error;
 331
 332         DPRINTF("\n");
 333         if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, &vp)) != 0) {
 334                 DPRINTF("error=%d\n", error);
 335                 return error;
 336         }
 337         *vpp = vp;
 338         DPRINTF("done.\n");
 339
 340         return 0;
 341 }
 342
 343 int
 344 v7fs_statvfs(struct mount *mp, struct statvfs *f)
 345 {
 346         struct v7fs_mount *v7fsmount = mp->mnt_data;
 347         struct v7fs_self *fs = v7fsmount->core;
 348
 349         DPRINTF("scratch remain=%d\n", fs->scratch_remain);
 350
 351         v7fs_superblock_status(fs);
 352
 353         f->f_bsize = V7FS_BSIZE;
 354         f->f_frsize = V7FS_BSIZE;
 355         f->f_iosize = V7FS_BSIZE;
 356         f->f_blocks = fs->stat.total_blocks;
 357         f->f_bfree = fs->stat.free_blocks;
 358         f->f_bavail = fs->stat.free_blocks;
 359         f->f_bresvd = 0;
 360         f->f_files = fs->stat.total_files;
 361         f->f_ffree = fs->stat.free_inode;
 362         f->f_favail = f->f_ffree;
 363         f->f_fresvd = 0;
 364         copy_statvfs_info(f, mp);
 365
 366         return 0;
 367 }
 368
 369 static bool
 370 v7fs_sync_selector(void *cl, struct vnode *vp)
 371 {
 372         struct v7fs_node *v7fs_node = vp->v_data;
 373
 374         if (v7fs_node == NULL)
 375                 return false;
 376         if (!v7fs_inode_allocated(&v7fs_node->inode))
 377                 return false;
 378
 379         return true;
 380 }
 381
 382 int
 383 v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
 384 {
 385         struct v7fs_mount *v7fsmount = mp->mnt_data;
 386         struct v7fs_self *fs = v7fsmount->core;
 387         struct vnode_iterator *marker;
 388         struct vnode *vp;
 389         int err, error;
 390
 391         DPRINTF("\n");
 392
 393         v7fs_superblock_writeback(fs);
 394         error = 0;
 395         vfs_vnode_iterator_init(mp, &marker);
 396         while ((vp = vfs_vnode_iterator_next(marker,
 397             v7fs_sync_selector, NULL)) != NULL) {
 398                 err = vn_lock(vp, LK_EXCLUSIVE);
 399                 if (err) {
 400                         vrele(vp);
 401                         continue;
 402                 }
 403                 err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0);
 404                 vput(vp);
 405                 if (err != 0)
 406                         error = err;
 407         }
 408         vfs_vnode_iterator_destroy(marker);
 409
 410         return error;
 411 }
 412
 413 static enum vtype
 414 v7fs_mode_to_vtype (v7fs_mode_t mode)
 415 {
 416         enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
 417
 418         if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
 419                 return VFIFO;
 420
 421         return table[((mode >> 13) & 7) - 1];
 422 }
 423
 424 int
 425 v7fs_loadvnode(struct mount *mp, struct vnode *vp,
 426     const void *key, size_t key_len, const void **new_key)
 427 {
 428         struct v7fs_mount *v7fsmount;
 429         struct v7fs_self *fs;
 430         struct v7fs_node *v7fs_node;
 431         struct v7fs_inode inode;
 432         v7fs_ino_t number;
 433         int error;
 434
 435         KASSERT(key_len == sizeof(number));
 436         memcpy(&number, key, key_len);
 437
 438         v7fsmount = mp->mnt_data;
 439         fs = v7fsmount->core;
 440
 441         /* Lookup requested i-node */
 442         if ((error = v7fs_inode_load(fs, &inode, number))) {
 443                 DPRINTF("v7fs_inode_load failed.\n");
 444                 return error;
 445         }
 446
 447         v7fs_node = pool_get(&v7fs_node_pool, PR_WAITOK);
 448         memset(v7fs_node, 0, sizeof(*v7fs_node));
 449
 450         vp->v_tag = VT_V7FS;
 451         vp->v_data = v7fs_node;
 452         v7fs_node->vnode = vp;
 453         v7fs_node->v7fsmount = v7fsmount;
 454         v7fs_node->inode = inode;/*structure copy */
 455         v7fs_node->lockf = NULL; /* advlock */
 456
 457         genfs_node_init(vp, &v7fs_genfsops);
 458         uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
 459
 460         if (number == V7FS_ROOT_INODE) {
 461                 vp->v_type = VDIR;
 462                 vp->v_vflag |= VV_ROOT;
 463                 vp->v_op = v7fs_vnodeop_p;
 464         } else {
 465                 vp->v_type = v7fs_mode_to_vtype(inode.mode);
 466
 467                 if (vp->v_type == VBLK || vp->v_type == VCHR) {
 468                         dev_t rdev = inode.device;
 469                         vp->v_op = v7fs_specop_p;
 470                         spec_node_init(vp, rdev);
 471                 } else if (vp->v_type == VFIFO) {
 472                         vp->v_op = v7fs_fifoop_p;
 473                 } else {
 474                         vp->v_op = v7fs_vnodeop_p;
 475                 }
 476         }
 477
 478         *new_key = &v7fs_node->inode.inode_number;
 479
 480         return 0;
 481 }
 482
 483
 484 int
 485 v7fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 486 {
 487         int error;
 488         v7fs_ino_t number;
 489         struct vnode *vp;
 490
 491         KASSERT(ino <= UINT16_MAX);
 492         number = ino;
 493
 494         error = vcache_get(mp, &number, sizeof(number), &vp);
 495         if (error)
 496                 return error;
 497         error = vn_lock(vp, LK_EXCLUSIVE);
 498         if (error) {
 499                 vrele(vp);
 500                 return error;
 501         }
 502
 503         *vpp = vp;
 504
 505         return 0;
 506 }
 507
 508 int
 509 v7fs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
 510 {
 511
 512         DPRINTF("\n");
 513         /* notyet */
 514         return EOPNOTSUPP;
 515 }
 516
 517 int
 518 v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
 519 {
 520
 521         DPRINTF("\n");
 522         /* notyet */
 523         return EOPNOTSUPP;
 524 }
 525
 526 void
 527 v7fs_init(void)
 528 {
 529
 530         DPRINTF("\n");
 531         pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
 532             "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
 533 }
 534
 535 void
 536 v7fs_reinit(void)
 537 {
 538
 539         /* Nothing to do. */
 540         DPRINTF("\n");
 541 }
 542
 543 void
 544 v7fs_done(void)
 545 {
 546
 547         DPRINTF("\n");
 548         pool_destroy(&v7fs_node_pool);
 549 }
 550
 551 int
 552 v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
 553     kauth_cred_t cred)
 554 {
 555
 556         DPRINTF("\n");
 557         return 0;
 558 }
 559
 560 int
 561 v7fs_mountroot(void)
 562 {
 563         struct mount *mp;
 564         int error;
 565
 566         DPRINTF("");
 567         /* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
 568         if ((error = is_v7fs_partition (rootvp)))
 569                 return error;
 570
 571         if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
 572                 DPRINTF("mountalloc error=%d\n", error);
 573                 vrele(rootvp);
 574                 return error;
 575         }
 576
 577         if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
 578                 DPRINTF("mountfs error=%d\n", error);
 579                 vfs_unbusy(mp, false, NULL);
 580                 vfs_destroy(mp);
 581                 return error;
 582         }
 583
 584         mountlist_append(mp);
 585
 586         vfs_unbusy(mp, false, NULL);
 587
 588         return 0;
 589 }