ext2_vfsops.c revision 12147
1/* 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7/* 8 * Copyright (c) 1989, 1991, 1993, 1994 9 * The Regents of the University of California. All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 40 */ 41 42#if !defined(__FreeBSD__) 43#include "quota.h" 44#endif 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/namei.h> 49#include <sys/proc.h> 50#include <sys/kernel.h> 51#include <sys/vnode.h> 52#include <sys/socket.h> 53#include <sys/mount.h> 54#include <sys/buf.h> 55#include <sys/mbuf.h> 56#include <sys/file.h> 57#include <sys/disklabel.h> 58#include <sys/ioctl.h> 59#include <sys/errno.h> 60#include <sys/malloc.h> 61#include <sys/stat.h> 62 63#include <miscfs/specfs/specdev.h> 64 65#include <ufs/ufs/quota.h> 66#include <ufs/ufs/ufsmount.h> 67#include <ufs/ufs/inode.h> 68#include <ufs/ufs/ufs_extern.h> 69 70#include <gnu/ext2fs/fs.h> 71#include <gnu/ext2fs/ext2_extern.h> 72#include <gnu/ext2fs/ext2_fs.h> 73#include <gnu/ext2fs/ext2_fs_sb.h> 74 75int ext2_sbupdate __P((struct ufsmount *, int)); 76 77struct vfsops ext2fs_vfsops = { 78 ext2_mount, 79 ufs_start, /* empty function */ 80 ext2_unmount, 81 ufs_root, /* root inode via vget */ 82 ufs_quotactl, /* does operations associated with quotas */ 83 ext2_statfs, 84 ext2_sync, 85 ext2_vget, 86 ext2_fhtovp, 87 ext2_vptofh, 88 ext2_init, 89}; 90 91#if defined(__FreeBSD__) 92VFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0); 93#define bsd_malloc malloc 94#define bsd_free free 95#endif 96 97extern u_long nextgennumber; 98 99/* 100 * Called by main() when ufs is going to be mounted as root. 101 * 102 * Name is updated by mount(8) after booting. 103 */ 104#define ROOTNAME "root_device" 105 106int 107ext2_mountroot() 108{ 109#if !defined(__FreeBSD__) 110 extern struct vnode *rootvp; 111#endif 112 register struct ext2_sb_info *fs; 113 register struct mount *mp; 114#if defined(__FreeBSD__) 115 struct proc *p = curproc; 116#else 117 struct proc *p = get_proc(); /* XXX */ 118#endif 119 struct ufsmount *ump; 120 u_int size; 121 int error; 122 123 /* 124 * Get vnodes for swapdev and rootdev. 125 */ 126 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 127 panic("ext2_mountroot: can't setup bdevvp's"); 128 129 mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 130 bzero((char *)mp, (u_long)sizeof(struct mount)); 131 mp->mnt_op = &ext2fs_vfsops; 132 mp->mnt_flag = MNT_RDONLY; 133 if (error = ext2_mountfs(rootvp, mp, p)) { 134 bsd_free(mp, M_MOUNT); 135 return (error); 136 } 137 if (error = vfs_lock(mp)) { 138 (void)ext2_unmount(mp, 0, p); 139 bsd_free(mp, M_MOUNT); 140 return (error); 141 } 142#if defined(__FreeBSD__) 143 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 144#else 145 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 146#endif 147 mp->mnt_flag |= MNT_ROOTFS; 148 mp->mnt_vnodecovered = NULLVP; 149 ump = VFSTOUFS(mp); 150 fs = ump->um_e2fs; 151 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 152 fs->fs_fsmnt[0] = '/'; 153 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 154 MNAMELEN); 155 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 156 &size); 157 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 158 (void)ext2_statfs(mp, &mp->mnt_stat, p); 159 vfs_unlock(mp); 160 inittodr(fs->s_es->s_wtime); /* this helps to set the time */ 161 return (0); 162} 163 164/* 165 * VFS Operations. 166 * 167 * mount system call 168 */ 169int 170ext2_mount(mp, path, data, ndp, p) 171 register struct mount *mp; 172 char *path; 173 caddr_t data; /* this is actually a (struct ufs_args *) */ 174 struct nameidata *ndp; 175 struct proc *p; 176{ 177 struct vnode *devvp; 178 struct ufs_args args; 179 struct ufsmount *ump = 0; 180 register struct ext2_sb_info *fs; 181 u_int size; 182 int error, flags; 183 184 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 185 return (error); 186 /* 187 * If updating, check whether changing from read-only to 188 * read/write; if there is no device name, that's all we do. 189 */ 190 if (mp->mnt_flag & MNT_UPDATE) { 191 ump = VFSTOUFS(mp); 192 fs = ump->um_e2fs; 193 error = 0; 194 if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) { 195 flags = WRITECLOSE; 196 if (mp->mnt_flag & MNT_FORCE) 197 flags |= FORCECLOSE; 198 if (vfs_busy(mp)) 199 return (EBUSY); 200 error = ext2_flushfiles(mp, flags, p); 201 vfs_unbusy(mp); 202 } 203 if (!error && (mp->mnt_flag & MNT_RELOAD)) 204 error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p); 205 if (error) 206 return (error); 207 if (fs->s_rd_only && (mp->mnt_flag & MNT_WANTRDWR)) 208 fs->s_rd_only = 0; 209 if (fs->s_rd_only == 0) { 210 /* don't say it's clean */ 211 fs->s_es->s_state &= ~EXT2_VALID_FS; 212 ext2_sbupdate(ump, MNT_WAIT); 213 } 214 if (args.fspec == 0) { 215 /* 216 * Process export requests. 217 */ 218 return (vfs_export(mp, &ump->um_export, &args.export)); 219 } 220 } 221 /* 222 * Not an update, or updating the name: look up the name 223 * and verify that it refers to a sensible block device. 224 */ 225 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 226 if (error = namei(ndp)) 227 return (error); 228 devvp = ndp->ni_vp; 229 230 if (devvp->v_type != VBLK) { 231 vrele(devvp); 232 return (ENOTBLK); 233 } 234 if (major(devvp->v_rdev) >= nblkdev) { 235 vrele(devvp); 236 return (ENXIO); 237 } 238 if ((mp->mnt_flag & MNT_UPDATE) == 0) 239 error = ext2_mountfs(devvp, mp, p); 240 else { 241 if (devvp != ump->um_devvp) 242 error = EINVAL; /* needs translation */ 243 else 244 vrele(devvp); 245 } 246 if (error) { 247 vrele(devvp); 248 return (error); 249 } 250 ump = VFSTOUFS(mp); 251 fs = ump->um_e2fs; 252 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 253 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 254 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 255 MNAMELEN); 256 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 257 &size); 258 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 259 (void)ext2_statfs(mp, &mp->mnt_stat, p); 260 return (0); 261} 262 263/* 264 * checks that the data in the descriptor blocks make sense 265 * this is taken from ext2/super.c 266 */ 267static int ext2_check_descriptors (struct ext2_sb_info * sb) 268{ 269 int i; 270 int desc_block = 0; 271 unsigned long block = sb->s_es->s_first_data_block; 272 struct ext2_group_desc * gdp = NULL; 273 274 /* ext2_debug ("Checking group descriptors"); */ 275 276 for (i = 0; i < sb->s_groups_count; i++) 277 { 278 /* examine next descriptor block */ 279 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 280 gdp = (struct ext2_group_desc *) 281 sb->s_group_desc[desc_block++]->b_data; 282 if (gdp->bg_block_bitmap < block || 283 gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 284 { 285 printf ("ext2_check_descriptors: " 286 "Block bitmap for group %d" 287 " not in group (block %lu)!", 288 i, (unsigned long) gdp->bg_block_bitmap); 289 return 0; 290 } 291 if (gdp->bg_inode_bitmap < block || 292 gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 293 { 294 printf ("ext2_check_descriptors: " 295 "Inode bitmap for group %d" 296 " not in group (block %lu)!", 297 i, (unsigned long) gdp->bg_inode_bitmap); 298 return 0; 299 } 300 if (gdp->bg_inode_table < block || 301 gdp->bg_inode_table + sb->s_itb_per_group >= 302 block + EXT2_BLOCKS_PER_GROUP(sb)) 303 { 304 printf ("ext2_check_descriptors: " 305 "Inode table for group %d" 306 " not in group (block %lu)!", 307 i, (unsigned long) gdp->bg_inode_table); 308 return 0; 309 } 310 block += EXT2_BLOCKS_PER_GROUP(sb); 311 gdp++; 312 } 313 return 1; 314} 315 316/* 317 * this computes the fields of the ext2_sb_info structure from the 318 * data in the ext2_super_block structure read in 319 */ 320static int compute_sb_data(devvp, es, fs) 321 struct vnode * devvp; 322 struct ext2_super_block * es; 323 struct ext2_sb_info * fs; 324{ 325 int db_count, error; 326 int i, j; 327 int logic_sb_block = 1; /* XXX for now */ 328 329#if 1 330#define V(v) 331#else 332#define V(v) printf(#v"= %d\n", fs->v); 333#endif 334 335 fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size; 336 V(s_blocksize) 337 fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size; 338 V(s_bshift) 339 fs->s_fsbtodb = es->s_log_block_size + 1; 340 V(s_fsbtodb) 341 fs->s_qbmask = fs->s_blocksize - 1; 342 V(s_bmask) 343 fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es); 344 V(s_blocksize_bits) 345 fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size; 346 V(s_frag_size) 347 if (fs->s_frag_size) 348 fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size; 349 V(s_frags_per_block) 350 fs->s_blocks_per_group = es->s_blocks_per_group; 351 V(s_blocks_per_group) 352 fs->s_frags_per_group = es->s_frags_per_group; 353 V(s_frags_per_group) 354 fs->s_inodes_per_group = es->s_inodes_per_group; 355 V(s_inodes_per_group) 356 fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE; 357 V(s_inodes_per_block) 358 fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block; 359 V(s_itb_per_group) 360 fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc); 361 V(s_desc_per_block) 362 /* s_resuid / s_resgid ? */ 363 fs->s_groups_count = (es->s_blocks_count - 364 es->s_first_data_block + 365 EXT2_BLOCKS_PER_GROUP(fs) - 1) / 366 EXT2_BLOCKS_PER_GROUP(fs); 367 V(s_groups_count) 368 db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) / 369 EXT2_DESC_PER_BLOCK(fs); 370 fs->s_db_per_group = db_count; 371 V(s_db_per_group) 372 373 fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *), 374 M_UFSMNT, M_WAITOK); 375 376 /* adjust logic_sb_block */ 377 if(fs->s_blocksize > SBSIZE) 378 /* Godmar thinks: if the blocksize is greater than 1024, then 379 the superblock is logically part of block zero. 380 */ 381 logic_sb_block = 0; 382 383 for (i = 0; i < db_count; i++) { 384 error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1), 385 fs->s_blocksize, NOCRED, &fs->s_group_desc[i]); 386 if(error) { 387 for (j = 0; j < i; j++) 388 brelse(fs->s_group_desc[j]); 389 bsd_free(fs->s_group_desc, M_UFSMNT); 390 printf("EXT2-fs: unable to read group descriptors (%d)\n", error); 391 return EIO; 392 } 393 } 394 if(!ext2_check_descriptors(fs)) { 395 for (j = 0; j < db_count; j++) 396 brelse(fs->s_group_desc[j]); 397 bsd_free(fs->s_group_desc, M_UFSMNT); 398 printf("EXT2-fs: (ext2_check_descriptors failure) " 399 "unable to read group descriptors\n"); 400 return EIO; 401 } 402 403 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) { 404 fs->s_inode_bitmap_number[i] = 0; 405 fs->s_inode_bitmap[i] = NULL; 406 fs->s_block_bitmap_number[i] = 0; 407 fs->s_block_bitmap[i] = NULL; 408 } 409 fs->s_loaded_inode_bitmaps = 0; 410 fs->s_loaded_block_bitmaps = 0; 411 return 0; 412} 413 414/* 415 * Reload all incore data for a filesystem (used after running fsck on 416 * the root filesystem and finding things to fix). The filesystem must 417 * be mounted read-only. 418 * 419 * Things to do to update the mount: 420 * 1) invalidate all cached meta-data. 421 * 2) re-read superblock from disk. 422 * 3) re-read summary information from disk. 423 * 4) invalidate all inactive vnodes. 424 * 5) invalidate all cached file data. 425 * 6) re-read inode data for all active vnodes. 426 */ 427int 428ext2_reload(mountp, cred, p) 429 register struct mount *mountp; 430 struct ucred *cred; 431 struct proc *p; 432{ 433 register struct vnode *vp, *nvp, *devvp; 434 struct inode *ip; 435 struct buf *bp; 436 struct ext2_super_block * es; 437 struct ext2_sb_info *fs; 438 int error; 439 440 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 441 return (EINVAL); 442 /* 443 * Step 1: invalidate all cached meta-data. 444 */ 445 devvp = VFSTOUFS(mountp)->um_devvp; 446 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 447 panic("ext2_reload: dirty1"); 448 /* 449 * Step 2: re-read superblock from disk. 450 * constants have been adjusted for ext2 451 */ 452 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 453 return (error); 454 es = (struct ext2_super_block *)bp->b_data; 455 if (es->s_magic != EXT2_SUPER_MAGIC) { 456 if(es->s_magic == EXT2_PRE_02B_MAGIC) 457 printf("This filesystem bears the magic number of a pre " 458 "0.2b version of ext2. This is not supported by " 459 "Lites.\n"); 460 else 461 printf("Wrong magic number: %x (expected %x for ext2 fs\n", 462 es->s_magic, EXT2_SUPER_MAGIC); 463 brelse(bp); 464 return (EIO); /* XXX needs translation */ 465 } 466 fs = VFSTOUFS(mountp)->um_e2fs; 467 bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block)); 468 469 if(error = compute_sb_data(devvp, es, fs)) { 470 brelse(bp); 471 return error; 472 } 473#ifdef UNKLAR 474 if (fs->fs_sbsize < SBSIZE) 475 bp->b_flags |= B_INVAL; 476#endif 477 brelse(bp); 478 479loop: 480 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 481 nvp = vp->v_mntvnodes.le_next; 482 /* 483 * Step 4: invalidate all inactive vnodes. 484 */ 485 if (vp->v_usecount == 0) { 486 vgone(vp); 487 continue; 488 } 489 /* 490 * Step 5: invalidate all cached file data. 491 */ 492 if (vget(vp, 1)) 493 goto loop; 494 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 495 panic("ext2_reload: dirty2"); 496 /* 497 * Step 6: re-read inode data for all active vnodes. 498 */ 499 ip = VTOI(vp); 500 if (error = 501 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 502 (int)fs->s_blocksize, NOCRED, &bp)) { 503 vput(vp); 504 return (error); 505 } 506 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + 507 EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), 508 &ip->i_din); 509 brelse(bp); 510 vput(vp); 511 if (vp->v_mount != mountp) 512 goto loop; 513 } 514 return (0); 515} 516 517/* 518 * Common code for mount and mountroot 519 */ 520int 521ext2_mountfs(devvp, mp, p) 522 register struct vnode *devvp; 523 struct mount *mp; 524 struct proc *p; 525{ 526 register struct ufsmount *ump; 527 struct buf *bp; 528 register struct ext2_sb_info *fs; 529 struct ext2_super_block * es; 530 dev_t dev = devvp->v_rdev; 531 struct partinfo dpart; 532 int havepart = 0; 533 int error, i, size; 534 int ronly; 535#if !defined(__FreeBSD__) 536 extern struct vnode *rootvp; 537#endif 538 539 /* 540 * Disallow multiple mounts of the same device. 541 * Disallow mounting of a device that is currently in use 542 * (except for root, which might share swap device for miniroot). 543 * Flush out any old buffers remaining from a previous use. 544 */ 545 if (error = vfs_mountedon(devvp)) 546 return (error); 547 if (vcount(devvp) > 1 && devvp != rootvp) 548 return (EBUSY); 549 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) 550 return (error); 551#ifdef READONLY 552/* turn on this to force it to be read-only */ 553 mp->mnt_flag |= MNT_RDONLY; 554#endif 555 556 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 557 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 558 return (error); 559 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 560 size = DEV_BSIZE; 561 else { 562 havepart = 1; 563 size = dpart.disklab->d_secsize; 564 } 565 566 bp = NULL; 567 ump = NULL; 568 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 569 goto out; 570 es = (struct ext2_super_block *)bp->b_data; 571 if (es->s_magic != EXT2_SUPER_MAGIC) { 572 if(es->s_magic == EXT2_PRE_02B_MAGIC) 573 printf("This filesystem bears the magic number of a pre " 574 "0.2b version of ext2. This is not supported by " 575 "Lites.\n"); 576 else 577 printf("Wrong magic number: %x (expected %x for EXT2FS)\n", 578 es->s_magic, EXT2_SUPER_MAGIC); 579 error = EINVAL; /* XXX needs translation */ 580 goto out; 581 } 582 ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 583 bzero((caddr_t)ump, sizeof *ump); 584 /* I don't know whether this is the right strategy. Note that 585 we dynamically allocate both a ext2_sb_info and a ext2_super_block 586 while Linux keeps the super block in a locked buffer 587 */ 588 ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info), 589 M_UFSMNT, M_WAITOK); 590 ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block), 591 M_UFSMNT, M_WAITOK); 592 bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block)); 593 if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) { 594 brelse(bp); 595 return error; 596 } 597 brelse(bp); 598 bp = NULL; 599 fs = ump->um_e2fs; 600 fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */ 601 if (!(fs->s_es->s_state & EXT2_VALID_FS)) { 602 printf("WARNING: %s was not properly dismounted\n", 603 fs->fs_fsmnt); 604 } 605 /* if the fs is not mounted read-only, make sure the super block is 606 always written back on a sync() 607 */ 608 if (ronly == 0) { 609 fs->s_dirt = 1; /* mark it modified */ 610 fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */ 611 } 612 mp->mnt_data = (qaddr_t)ump; 613 mp->mnt_stat.f_fsid.val[0] = (long)dev; 614 mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS; 615 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 616 mp->mnt_flag |= MNT_LOCAL; 617 ump->um_mountp = mp; 618 ump->um_dev = dev; 619 ump->um_devvp = devvp; 620 /* setting those two parameters allows us to use 621 ufs_bmap w/o changse ! 622 */ 623 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 624 ump->um_bptrtodb = fs->s_es->s_log_block_size + 1; 625 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 626 for (i = 0; i < MAXQUOTAS; i++) 627 ump->um_quotas[i] = NULLVP; 628 devvp->v_specflags |= SI_MOUNTEDON; 629 if (ronly == 0) 630 ext2_sbupdate(ump, MNT_WAIT); 631 return (0); 632out: 633 if (bp) 634 brelse(bp); 635 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 636 if (ump) { 637 bsd_free(ump->um_fs, M_UFSMNT); 638 bsd_free(ump, M_UFSMNT); 639 mp->mnt_data = (qaddr_t)0; 640 } 641 return (error); 642} 643 644/* 645 * unmount system call 646 */ 647int 648ext2_unmount(mp, mntflags, p) 649 struct mount *mp; 650 int mntflags; 651 struct proc *p; 652{ 653 register struct ufsmount *ump; 654 register struct ext2_sb_info *fs; 655 int error, flags, ronly, i; 656 657 flags = 0; 658 if (mntflags & MNT_FORCE) { 659 if (mp->mnt_flag & MNT_ROOTFS) 660 return (EINVAL); 661 flags |= FORCECLOSE; 662 } 663 if (error = ext2_flushfiles(mp, flags, p)) 664 return (error); 665 ump = VFSTOUFS(mp); 666 fs = ump->um_e2fs; 667 ronly = fs->s_rd_only; 668 if (!ronly) { 669 fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */ 670 ext2_sbupdate(ump, MNT_WAIT); 671 } 672 /* release buffers containing group descriptors */ 673 for(i = 0; i < fs->s_db_per_group; i++) 674 brelse(fs->s_group_desc[i]); 675 /* release cached inode/block bitmaps */ 676 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 677 if (fs->s_inode_bitmap[i]) 678 brelse (fs->s_inode_bitmap[i]); 679 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 680 if (fs->s_block_bitmap[i]) 681 brelse (fs->s_block_bitmap[i]); 682 683 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 684 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 685 NOCRED, p); 686 vrele(ump->um_devvp); 687 bsd_free(fs->s_es, M_UFSMNT); 688 bsd_free(fs, M_UFSMNT); 689 bsd_free(ump, M_UFSMNT); 690 mp->mnt_data = (qaddr_t)0; 691 mp->mnt_flag &= ~MNT_LOCAL; 692 return (error); 693} 694 695/* 696 * Flush out all the files in a filesystem. 697 */ 698int 699ext2_flushfiles(mp, flags, p) 700 register struct mount *mp; 701 int flags; 702 struct proc *p; 703{ 704#if !defined(__FreeBSD__) 705 extern int doforce; 706#endif 707 register struct ufsmount *ump; 708 int error; 709 710 if (!doforce) 711 flags &= ~FORCECLOSE; 712 ump = VFSTOUFS(mp); 713#if QUOTA 714 if (mp->mnt_flag & MNT_QUOTA) { 715 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 716 return (error); 717 for (i = 0; i < MAXQUOTAS; i++) { 718 if (ump->um_quotas[i] == NULLVP) 719 continue; 720 quotaoff(p, mp, i); 721 } 722 /* 723 * Here we fall through to vflush again to ensure 724 * that we have gotten rid of all the system vnodes. 725 */ 726 } 727#endif 728 error = vflush(mp, NULLVP, flags); 729 return (error); 730} 731 732/* 733 * Get file system statistics. 734 * taken from ext2/super.c ext2_statfs 735 */ 736int 737ext2_statfs(mp, sbp, p) 738 struct mount *mp; 739 register struct statfs *sbp; 740 struct proc *p; 741{ 742 unsigned long overhead; 743 unsigned long overhead_per_group; 744 745 register struct ufsmount *ump; 746 register struct ext2_sb_info *fs; 747 register struct ext2_super_block *es; 748 749 ump = VFSTOUFS(mp); 750 fs = ump->um_e2fs; 751 es = fs->s_es; 752 753 if (es->s_magic != EXT2_SUPER_MAGIC) 754 panic("ext2_statfs - magic number spoiled"); 755 756 /* 757 * Compute the overhead (FS structures) 758 */ 759 overhead_per_group = 1 /* super block */ + 760 fs->s_db_per_group + 761 1 /* block bitmap */ + 762 1 /* inode bitmap */ + 763 fs->s_itb_per_group; 764 overhead = es->s_first_data_block + 765 fs->s_groups_count * overhead_per_group; 766 767 sbp->f_type = MOUNT_EXT2FS; 768 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 769 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 770 sbp->f_blocks = es->s_blocks_count - overhead; 771 sbp->f_bfree = es->s_free_blocks_count; 772 sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count; 773 sbp->f_files = es->s_inodes_count; 774 sbp->f_ffree = es->s_free_inodes_count; 775 if (sbp != &mp->mnt_stat) { 776 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 777 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 778 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 779 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 780 } 781 return (0); 782} 783 784/* 785 * Go through the disk queues to initiate sandbagged IO; 786 * go through the inodes to write those that have been modified; 787 * initiate the writing of the super block if it has been modified. 788 * 789 * Note: we are always called with the filesystem marked `MPBUSY'. 790 */ 791int 792ext2_sync(mp, waitfor, cred, p) 793 struct mount *mp; 794 int waitfor; 795 struct ucred *cred; 796 struct proc *p; 797{ 798 register struct vnode *vp; 799 register struct inode *ip; 800 register struct ufsmount *ump = VFSTOUFS(mp); 801 register struct ext2_sb_info *fs; 802 int error, allerror = 0; 803 804 fs = ump->um_e2fs; 805 /* 806 * Write back modified superblock. 807 * Consistency check that the superblock 808 * is still in the buffer cache. 809 */ 810 if (fs->s_dirt) { 811#if !defined(__FreeBSD__) 812 struct timeval time; 813#endif 814 815 if (fs->s_rd_only != 0) { /* XXX */ 816 printf("fs = %s\n", fs->fs_fsmnt); 817 panic("update: rofs mod"); 818 } 819 fs->s_dirt = 0; 820#if !defined(__FreeBSD__) 821 get_time(&time); 822#endif 823 fs->s_es->s_wtime = time.tv_sec; 824 allerror = ext2_sbupdate(ump, waitfor); 825 } 826 /* 827 * Write back each (modified) inode. 828 */ 829loop: 830 for (vp = mp->mnt_vnodelist.lh_first; 831 vp != NULL; 832 vp = vp->v_mntvnodes.le_next) { 833 /* 834 * If the vnode that we are about to sync is no longer 835 * associated with this mount point, start over. 836 */ 837 if (vp->v_mount != mp) 838 goto loop; 839 if (VOP_ISLOCKED(vp)) 840 continue; 841 ip = VTOI(vp); 842 if ((ip->i_flag & 843 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 844 vp->v_dirtyblkhd.lh_first == NULL) 845 continue; 846 if (vget(vp, 1)) 847 goto loop; 848 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 849 allerror = error; 850 vput(vp); 851 } 852 /* 853 * Force stale file system control information to be flushed. 854 */ 855 if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 856 allerror = error; 857#if QUOTA 858 qsync(mp); 859#endif 860 return (allerror); 861} 862 863/* 864 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it 865 * in from disk. If it is in core, wait for the lock bit to clear, then 866 * return the inode locked. Detection and handling of mount points must be 867 * done by the calling routine. 868 */ 869int 870ext2_vget(mp, ino, vpp) 871 struct mount *mp; 872 ino_t ino; 873 struct vnode **vpp; 874{ 875 register struct ext2_sb_info *fs; 876 register struct inode *ip; 877 struct ufsmount *ump; 878 struct buf *bp; 879 struct vnode *vp; 880 dev_t dev; 881 int i, type, error; 882 int used_blocks; 883 884 ump = VFSTOUFS(mp); 885 dev = ump->um_dev; 886 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 887 return (0); 888 889 /* Allocate a new vnode/inode. */ 890 if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) { 891 *vpp = NULL; 892 return (error); 893 } 894 /* I don't really know what this 'type' does. I suppose it's some kind 895 * of memory accounting. Let's just book this memory on FFS's account 896 * If I'm not mistaken, this stuff isn't implemented anyway in Lites 897 */ 898 type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */ 899 MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK); 900 insmntque(vp, mp); 901 bzero((caddr_t)ip, sizeof(struct inode)); 902 vp->v_data = ip; 903 ip->i_vnode = vp; 904 ip->i_e2fs = fs = ump->um_e2fs; 905 ip->i_dev = dev; 906 ip->i_number = ino; 907#if QUOTA 908 for (i = 0; i < MAXQUOTAS; i++) 909 ip->i_dquot[i] = NODQUOT; 910#endif 911 /* 912 * Put it onto its hash chain and lock it so that other requests for 913 * this inode will block if they arrive while we are sleeping waiting 914 * for old data structures to be purged or for the contents of the 915 * disk portion of this inode to be read. 916 */ 917 ufs_ihashins(ip); 918 919 /* Read in the disk contents for the inode, copy into the inode. */ 920#if 0 921printf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino))); 922#endif 923 if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 924 (int)fs->s_blocksize, NOCRED, &bp)) { 925 /* 926 * The inode does not contain anything useful, so it would 927 * be misleading to leave it on its hash chain. With mode 928 * still zero, it will be unlinked and returned to the free 929 * list by vput(). 930 */ 931 vput(vp); 932 brelse(bp); 933 *vpp = NULL; 934 return (error); 935 } 936 /* convert ext2 inode to dinode */ 937 ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE * 938 ino_to_fsbo(fs, ino)), &ip->i_din); 939 ip->i_block_group = ino_to_cg(fs, ino); 940 ip->i_next_alloc_block = 0; 941 ip->i_next_alloc_goal = 0; 942 ip->i_prealloc_count = 0; 943 ip->i_prealloc_block = 0; 944 /* now we want to make sure that block pointers for unused 945 blocks are zeroed out - ext2_balloc depends on this 946 although for regular files and directories only 947 */ 948 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 949 used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize; 950 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 951 ip->i_db[i] = 0; 952 } 953/* 954 ext2_print_inode(ip); 955*/ 956 brelse(bp); 957 958 /* 959 * Initialize the vnode from the inode, check for aliases. 960 * Note that the underlying vnode may have changed. 961 */ 962 if (error = ufs_vinit(mp, ext2_specop_p, EXT2_FIFOOPS, &vp)) { 963 vput(vp); 964 *vpp = NULL; 965 return (error); 966 } 967 /* 968 * Finish inode initialization now that aliasing has been resolved. 969 */ 970 ip->i_devvp = ump->um_devvp; 971 VREF(ip->i_devvp); 972 /* 973 * Set up a generation number for this inode if it does not 974 * already have one. This should only happen on old filesystems. 975 */ 976 if (ip->i_gen == 0) { 977#if !defined(__FreeBSD__) 978 struct timeval time; 979 get_time(&time); 980#endif 981 if (++nextgennumber < (u_long)time.tv_sec) 982 nextgennumber = time.tv_sec; 983 ip->i_gen = nextgennumber; 984 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 985 ip->i_flag |= IN_MODIFIED; 986 } 987 *vpp = vp; 988 return (0); 989} 990 991/* 992 * File handle to vnode 993 * 994 * Have to be really careful about stale file handles: 995 * - check that the inode number is valid 996 * - call ext2_vget() to get the locked inode 997 * - check for an unallocated inode (i_mode == 0) 998 * - check that the given client host has export rights and return 999 * those rights via. exflagsp and credanonp 1000 */ 1001int 1002ext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 1003 register struct mount *mp; 1004 struct fid *fhp; 1005 struct mbuf *nam; 1006 struct vnode **vpp; 1007 int *exflagsp; 1008 struct ucred **credanonp; 1009{ 1010 register struct ufid *ufhp; 1011 struct ext2_sb_info *fs; 1012 1013 ufhp = (struct ufid *)fhp; 1014 fs = VFSTOUFS(mp)->um_e2fs; 1015 if (ufhp->ufid_ino < ROOTINO || 1016 ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group) 1017 return (ESTALE); 1018 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 1019} 1020 1021/* 1022 * Vnode pointer to File handle 1023 */ 1024/* ARGSUSED */ 1025int 1026ext2_vptofh(vp, fhp) 1027 struct vnode *vp; 1028 struct fid *fhp; 1029{ 1030 register struct inode *ip; 1031 register struct ufid *ufhp; 1032 1033 ip = VTOI(vp); 1034 ufhp = (struct ufid *)fhp; 1035 ufhp->ufid_len = sizeof(struct ufid); 1036 ufhp->ufid_ino = ip->i_number; 1037 ufhp->ufid_gen = ip->i_gen; 1038 return (0); 1039} 1040 1041/* 1042 * Write a superblock and associated information back to disk. 1043 */ 1044int 1045ext2_sbupdate(mp, waitfor) 1046 struct ufsmount *mp; 1047 int waitfor; 1048{ 1049 register struct ext2_sb_info *fs = mp->um_e2fs; 1050 register struct ext2_super_block *es = fs->s_es; 1051 register struct buf *bp; 1052 int i, error = 0; 1053/* 1054printf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no"); 1055*/ 1056 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 1057 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block)); 1058 if (waitfor == MNT_WAIT) 1059 error = bwrite(bp); 1060 else 1061 bawrite(bp); 1062 1063 /* write group descriptors back on disk */ 1064 for(i = 0; i < fs->s_db_per_group; i++) 1065 /* Godmar thinks: we must avoid using any of the b*write 1066 * functions here: we want to keep the buffer locked 1067 * so we use my 'housemade' write routine: 1068 */ 1069 error |= ll_w_block(fs->s_group_desc[i], waitfor == MNT_WAIT); 1070 1071 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 1072 if (fs->s_inode_bitmap[i]) 1073 ll_w_block (fs->s_inode_bitmap[i], 1); 1074 for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 1075 if (fs->s_block_bitmap[i]) 1076 ll_w_block (fs->s_block_bitmap[i], 1); 1077 1078 return (error); 1079} 1080