Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/ufs/ffs/ffs_vfsops.c
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1 /*- 2 * Copyright (c) 1989, 1991, 1993, 1994 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ffs_vfsops.c 8.31 (Berkeley) 5/20/95 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/8.0/sys/ufs/ffs/ffs_vfsops.c 197060 2009-09-10 12:42:36Z kib $"); 34 35 #include "opt_quota.h" 36 #include "opt_ufs.h" 37 #include "opt_ffs.h" 38 #include "opt_ddb.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/namei.h> 43 #include <sys/priv.h> 44 #include <sys/proc.h> 45 #include <sys/kernel.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/fcntl.h> 52 #include <sys/malloc.h> 53 #include <sys/mutex.h> 54 55 #include <security/mac/mac_framework.h> 56 57 #include <ufs/ufs/extattr.h> 58 #include <ufs/ufs/gjournal.h> 59 #include <ufs/ufs/quota.h> 60 #include <ufs/ufs/ufsmount.h> 61 #include <ufs/ufs/inode.h> 62 #include <ufs/ufs/ufs_extern.h> 63 64 #include <ufs/ffs/fs.h> 65 #include <ufs/ffs/ffs_extern.h> 66 67 #include <vm/vm.h> 68 #include <vm/uma.h> 69 #include <vm/vm_page.h> 70 71 #include <geom/geom.h> 72 #include <geom/geom_vfs.h> 73 74 #include <ddb/ddb.h> 75 76 static uma_zone_t uma_inode, uma_ufs1, uma_ufs2; 77 78 static int ffs_reload(struct mount *, struct thread *); 79 static int ffs_mountfs(struct vnode *, struct mount *, struct thread *); 80 static void ffs_oldfscompat_read(struct fs *, struct ufsmount *, 81 ufs2_daddr_t); 82 static void ffs_oldfscompat_write(struct fs *, struct ufsmount *); 83 static void ffs_ifree(struct ufsmount *ump, struct inode *ip); 84 static vfs_init_t ffs_init; 85 static vfs_uninit_t ffs_uninit; 86 static vfs_extattrctl_t ffs_extattrctl; 87 static vfs_cmount_t ffs_cmount; 88 static vfs_unmount_t ffs_unmount; 89 static vfs_mount_t ffs_mount; 90 static vfs_statfs_t ffs_statfs; 91 static vfs_fhtovp_t ffs_fhtovp; 92 static vfs_sync_t ffs_sync; 93 94 static struct vfsops ufs_vfsops = { 95 .vfs_extattrctl = ffs_extattrctl, 96 .vfs_fhtovp = ffs_fhtovp, 97 .vfs_init = ffs_init, 98 .vfs_mount = ffs_mount, 99 .vfs_cmount = ffs_cmount, 100 .vfs_quotactl = ufs_quotactl, 101 .vfs_root = ufs_root, 102 .vfs_statfs = ffs_statfs, 103 .vfs_sync = ffs_sync, 104 .vfs_uninit = ffs_uninit, 105 .vfs_unmount = ffs_unmount, 106 .vfs_vget = ffs_vget, 107 .vfs_susp_clean = process_deferred_inactive, 108 }; 109 110 VFS_SET(ufs_vfsops, ufs, 0); 111 MODULE_VERSION(ufs, 1); 112 113 static b_strategy_t ffs_geom_strategy; 114 static b_write_t ffs_bufwrite; 115 116 static struct buf_ops ffs_ops = { 117 .bop_name = "FFS", 118 .bop_write = ffs_bufwrite, 119 .bop_strategy = ffs_geom_strategy, 120 .bop_sync = bufsync, 121 #ifdef NO_FFS_SNAPSHOT 122 .bop_bdflush = bufbdflush, 123 #else 124 .bop_bdflush = ffs_bdflush, 125 #endif 126 }; 127 128 static const char *ffs_opts[] = { "acls", "async", "noatime", "noclusterr", 129 "noclusterw", "noexec", "export", "force", "from", "multilabel", 130 "snapshot", "nosuid", "suiddir", "nosymfollow", "sync", 131 "union", NULL }; 132 133 static int 134 ffs_mount(struct mount *mp) 135 { 136 struct vnode *devvp; 137 struct thread *td; 138 struct ufsmount *ump = 0; 139 struct fs *fs; 140 int error, flags; 141 u_int mntorflags, mntandnotflags; 142 accmode_t accmode; 143 struct nameidata ndp; 144 char *fspec; 145 146 td = curthread; 147 if (vfs_filteropt(mp->mnt_optnew, ffs_opts)) 148 return (EINVAL); 149 if (uma_inode == NULL) { 150 uma_inode = uma_zcreate("FFS inode", 151 sizeof(struct inode), NULL, NULL, NULL, NULL, 152 UMA_ALIGN_PTR, 0); 153 uma_ufs1 = uma_zcreate("FFS1 dinode", 154 sizeof(struct ufs1_dinode), NULL, NULL, NULL, NULL, 155 UMA_ALIGN_PTR, 0); 156 uma_ufs2 = uma_zcreate("FFS2 dinode", 157 sizeof(struct ufs2_dinode), NULL, NULL, NULL, NULL, 158 UMA_ALIGN_PTR, 0); 159 } 160 161 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 162 if (error) 163 return (error); 164 165 mntorflags = 0; 166 mntandnotflags = 0; 167 if (vfs_getopt(mp->mnt_optnew, "acls", NULL, NULL) == 0) 168 mntorflags |= MNT_ACLS; 169 170 if (vfs_getopt(mp->mnt_optnew, "snapshot", NULL, NULL) == 0) { 171 mntorflags |= MNT_SNAPSHOT; 172 /* 173 * Once we have set the MNT_SNAPSHOT flag, do not 174 * persist "snapshot" in the options list. 175 */ 176 vfs_deleteopt(mp->mnt_optnew, "snapshot"); 177 vfs_deleteopt(mp->mnt_opt, "snapshot"); 178 } 179 180 MNT_ILOCK(mp); 181 mp->mnt_flag = (mp->mnt_flag | mntorflags) & ~mntandnotflags; 182 MNT_IUNLOCK(mp); 183 /* 184 * If updating, check whether changing from read-only to 185 * read/write; if there is no device name, that's all we do. 186 */ 187 if (mp->mnt_flag & MNT_UPDATE) { 188 ump = VFSTOUFS(mp); 189 fs = ump->um_fs; 190 devvp = ump->um_devvp; 191 if (fs->fs_ronly == 0 && 192 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 193 /* 194 * Flush any dirty data and suspend filesystem. 195 */ 196 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 197 return (error); 198 for (;;) { 199 vn_finished_write(mp); 200 if ((error = vfs_write_suspend(mp)) != 0) 201 return (error); 202 MNT_ILOCK(mp); 203 if (mp->mnt_kern_flag & MNTK_SUSPENDED) { 204 /* 205 * Allow the secondary writes 206 * to proceed. 207 */ 208 mp->mnt_kern_flag &= ~(MNTK_SUSPENDED | 209 MNTK_SUSPEND2); 210 wakeup(&mp->mnt_flag); 211 MNT_IUNLOCK(mp); 212 /* 213 * Allow the curthread to 214 * ignore the suspension to 215 * synchronize on-disk state. 216 */ 217 td->td_pflags |= TDP_IGNSUSP; 218 break; 219 } 220 MNT_IUNLOCK(mp); 221 vn_start_write(NULL, &mp, V_WAIT); 222 } 223 /* 224 * Check for and optionally get rid of files open 225 * for writing. 226 */ 227 flags = WRITECLOSE; 228 if (mp->mnt_flag & MNT_FORCE) 229 flags |= FORCECLOSE; 230 if (mp->mnt_flag & MNT_SOFTDEP) { 231 error = softdep_flushfiles(mp, flags, td); 232 } else { 233 error = ffs_flushfiles(mp, flags, td); 234 } 235 if (error) { 236 vfs_write_resume(mp); 237 return (error); 238 } 239 if (fs->fs_pendingblocks != 0 || 240 fs->fs_pendinginodes != 0) { 241 printf("%s: %s: blocks %jd files %d\n", 242 fs->fs_fsmnt, "update error", 243 (intmax_t)fs->fs_pendingblocks, 244 fs->fs_pendinginodes); 245 fs->fs_pendingblocks = 0; 246 fs->fs_pendinginodes = 0; 247 } 248 if ((fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) 249 fs->fs_clean = 1; 250 if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) { 251 fs->fs_ronly = 0; 252 fs->fs_clean = 0; 253 vfs_write_resume(mp); 254 return (error); 255 } 256 DROP_GIANT(); 257 g_topology_lock(); 258 g_access(ump->um_cp, 0, -1, 0); 259 g_topology_unlock(); 260 PICKUP_GIANT(); 261 fs->fs_ronly = 1; 262 MNT_ILOCK(mp); 263 mp->mnt_flag |= MNT_RDONLY; 264 MNT_IUNLOCK(mp); 265 /* 266 * Allow the writers to note that filesystem 267 * is ro now. 268 */ 269 vfs_write_resume(mp); 270 } 271 if ((mp->mnt_flag & MNT_RELOAD) && 272 (error = ffs_reload(mp, td)) != 0) 273 return (error); 274 if (fs->fs_ronly && 275 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 276 /* 277 * If upgrade to read-write by non-root, then verify 278 * that user has necessary permissions on the device. 279 */ 280 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 281 error = VOP_ACCESS(devvp, VREAD | VWRITE, 282 td->td_ucred, td); 283 if (error) 284 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 285 if (error) { 286 VOP_UNLOCK(devvp, 0); 287 return (error); 288 } 289 VOP_UNLOCK(devvp, 0); 290 fs->fs_flags &= ~FS_UNCLEAN; 291 if (fs->fs_clean == 0) { 292 fs->fs_flags |= FS_UNCLEAN; 293 if ((mp->mnt_flag & MNT_FORCE) || 294 ((fs->fs_flags & FS_NEEDSFSCK) == 0 && 295 (fs->fs_flags & FS_DOSOFTDEP))) { 296 printf("WARNING: %s was not %s\n", 297 fs->fs_fsmnt, "properly dismounted"); 298 } else { 299 printf( 300 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 301 fs->fs_fsmnt); 302 return (EPERM); 303 } 304 } 305 DROP_GIANT(); 306 g_topology_lock(); 307 /* 308 * If we're the root device, we may not have an E count 309 * yet, get it now. 310 */ 311 if (ump->um_cp->ace == 0) 312 error = g_access(ump->um_cp, 0, 1, 1); 313 else 314 error = g_access(ump->um_cp, 0, 1, 0); 315 g_topology_unlock(); 316 PICKUP_GIANT(); 317 if (error) 318 return (error); 319 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 320 return (error); 321 fs->fs_ronly = 0; 322 MNT_ILOCK(mp); 323 mp->mnt_flag &= ~MNT_RDONLY; 324 MNT_IUNLOCK(mp); 325 fs->fs_clean = 0; 326 if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) { 327 vn_finished_write(mp); 328 return (error); 329 } 330 /* check to see if we need to start softdep */ 331 if ((fs->fs_flags & FS_DOSOFTDEP) && 332 (error = softdep_mount(devvp, mp, fs, td->td_ucred))){ 333 vn_finished_write(mp); 334 return (error); 335 } 336 if (fs->fs_snapinum[0] != 0) 337 ffs_snapshot_mount(mp); 338 vn_finished_write(mp); 339 } 340 /* 341 * Soft updates is incompatible with "async", 342 * so if we are doing softupdates stop the user 343 * from setting the async flag in an update. 344 * Softdep_mount() clears it in an initial mount 345 * or ro->rw remount. 346 */ 347 if (mp->mnt_flag & MNT_SOFTDEP) { 348 /* XXX: Reset too late ? */ 349 MNT_ILOCK(mp); 350 mp->mnt_flag &= ~MNT_ASYNC; 351 MNT_IUNLOCK(mp); 352 } 353 /* 354 * Keep MNT_ACLS flag if it is stored in superblock. 355 */ 356 if ((fs->fs_flags & FS_ACLS) != 0) { 357 /* XXX: Set too late ? */ 358 MNT_ILOCK(mp); 359 mp->mnt_flag |= MNT_ACLS; 360 MNT_IUNLOCK(mp); 361 } 362 363 /* 364 * If this is a snapshot request, take the snapshot. 365 */ 366 if (mp->mnt_flag & MNT_SNAPSHOT) 367 return (ffs_snapshot(mp, fspec)); 368 } 369 370 /* 371 * Not an update, or updating the name: look up the name 372 * and verify that it refers to a sensible disk device. 373 */ 374 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 375 if ((error = namei(&ndp)) != 0) 376 return (error); 377 NDFREE(&ndp, NDF_ONLY_PNBUF); 378 devvp = ndp.ni_vp; 379 if (!vn_isdisk(devvp, &error)) { 380 vput(devvp); 381 return (error); 382 } 383 384 /* 385 * If mount by non-root, then verify that user has necessary 386 * permissions on the device. 387 */ 388 accmode = VREAD; 389 if ((mp->mnt_flag & MNT_RDONLY) == 0) 390 accmode |= VWRITE; 391 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 392 if (error) 393 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 394 if (error) { 395 vput(devvp); 396 return (error); 397 } 398 399 if (mp->mnt_flag & MNT_UPDATE) { 400 /* 401 * Update only 402 * 403 * If it's not the same vnode, or at least the same device 404 * then it's not correct. 405 */ 406 407 if (devvp->v_rdev != ump->um_devvp->v_rdev) 408 error = EINVAL; /* needs translation */ 409 vput(devvp); 410 if (error) 411 return (error); 412 } else { 413 /* 414 * New mount 415 * 416 * We need the name for the mount point (also used for 417 * "last mounted on") copied in. If an error occurs, 418 * the mount point is discarded by the upper level code. 419 * Note that vfs_mount() populates f_mntonname for us. 420 */ 421 if ((error = ffs_mountfs(devvp, mp, td)) != 0) { 422 vrele(devvp); 423 return (error); 424 } 425 } 426 vfs_mountedfrom(mp, fspec); 427 return (0); 428 } 429 430 /* 431 * Compatibility with old mount system call. 432 */ 433 434 static int 435 ffs_cmount(struct mntarg *ma, void *data, int flags) 436 { 437 struct ufs_args args; 438 int error; 439 440 if (data == NULL) 441 return (EINVAL); 442 error = copyin(data, &args, sizeof args); 443 if (error) 444 return (error); 445 446 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 447 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 448 error = kernel_mount(ma, flags); 449 450 return (error); 451 } 452 453 /* 454 * Reload all incore data for a filesystem (used after running fsck on 455 * the root filesystem and finding things to fix). The filesystem must 456 * be mounted read-only. 457 * 458 * Things to do to update the mount: 459 * 1) invalidate all cached meta-data. 460 * 2) re-read superblock from disk. 461 * 3) re-read summary information from disk. 462 * 4) invalidate all inactive vnodes. 463 * 5) invalidate all cached file data. 464 * 6) re-read inode data for all active vnodes. 465 */ 466 static int 467 ffs_reload(struct mount *mp, struct thread *td) 468 { 469 struct vnode *vp, *mvp, *devvp; 470 struct inode *ip; 471 void *space; 472 struct buf *bp; 473 struct fs *fs, *newfs; 474 struct ufsmount *ump; 475 ufs2_daddr_t sblockloc; 476 int i, blks, size, error; 477 int32_t *lp; 478 479 if ((mp->mnt_flag & MNT_RDONLY) == 0) 480 return (EINVAL); 481 ump = VFSTOUFS(mp); 482 /* 483 * Step 1: invalidate all cached meta-data. 484 */ 485 devvp = VFSTOUFS(mp)->um_devvp; 486 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 487 if (vinvalbuf(devvp, 0, 0, 0) != 0) 488 panic("ffs_reload: dirty1"); 489 VOP_UNLOCK(devvp, 0); 490 491 /* 492 * Step 2: re-read superblock from disk. 493 */ 494 fs = VFSTOUFS(mp)->um_fs; 495 if ((error = bread(devvp, btodb(fs->fs_sblockloc), fs->fs_sbsize, 496 NOCRED, &bp)) != 0) 497 return (error); 498 newfs = (struct fs *)bp->b_data; 499 if ((newfs->fs_magic != FS_UFS1_MAGIC && 500 newfs->fs_magic != FS_UFS2_MAGIC) || 501 newfs->fs_bsize > MAXBSIZE || 502 newfs->fs_bsize < sizeof(struct fs)) { 503 brelse(bp); 504 return (EIO); /* XXX needs translation */ 505 } 506 /* 507 * Copy pointer fields back into superblock before copying in XXX 508 * new superblock. These should really be in the ufsmount. XXX 509 * Note that important parameters (eg fs_ncg) are unchanged. 510 */ 511 newfs->fs_csp = fs->fs_csp; 512 newfs->fs_maxcluster = fs->fs_maxcluster; 513 newfs->fs_contigdirs = fs->fs_contigdirs; 514 newfs->fs_active = fs->fs_active; 515 /* The file system is still read-only. */ 516 newfs->fs_ronly = 1; 517 sblockloc = fs->fs_sblockloc; 518 bcopy(newfs, fs, (u_int)fs->fs_sbsize); 519 brelse(bp); 520 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 521 ffs_oldfscompat_read(fs, VFSTOUFS(mp), sblockloc); 522 UFS_LOCK(ump); 523 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 524 printf("%s: reload pending error: blocks %jd files %d\n", 525 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 526 fs->fs_pendinginodes); 527 fs->fs_pendingblocks = 0; 528 fs->fs_pendinginodes = 0; 529 } 530 UFS_UNLOCK(ump); 531 532 /* 533 * Step 3: re-read summary information from disk. 534 */ 535 blks = howmany(fs->fs_cssize, fs->fs_fsize); 536 space = fs->fs_csp; 537 for (i = 0; i < blks; i += fs->fs_frag) { 538 size = fs->fs_bsize; 539 if (i + fs->fs_frag > blks) 540 size = (blks - i) * fs->fs_fsize; 541 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 542 NOCRED, &bp); 543 if (error) 544 return (error); 545 bcopy(bp->b_data, space, (u_int)size); 546 space = (char *)space + size; 547 brelse(bp); 548 } 549 /* 550 * We no longer know anything about clusters per cylinder group. 551 */ 552 if (fs->fs_contigsumsize > 0) { 553 lp = fs->fs_maxcluster; 554 for (i = 0; i < fs->fs_ncg; i++) 555 *lp++ = fs->fs_contigsumsize; 556 } 557 558 loop: 559 MNT_ILOCK(mp); 560 MNT_VNODE_FOREACH(vp, mp, mvp) { 561 VI_LOCK(vp); 562 if (vp->v_iflag & VI_DOOMED) { 563 VI_UNLOCK(vp); 564 continue; 565 } 566 MNT_IUNLOCK(mp); 567 /* 568 * Step 4: invalidate all cached file data. 569 */ 570 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 571 MNT_VNODE_FOREACH_ABORT(mp, mvp); 572 goto loop; 573 } 574 if (vinvalbuf(vp, 0, 0, 0)) 575 panic("ffs_reload: dirty2"); 576 /* 577 * Step 5: re-read inode data for all active vnodes. 578 */ 579 ip = VTOI(vp); 580 error = 581 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 582 (int)fs->fs_bsize, NOCRED, &bp); 583 if (error) { 584 VOP_UNLOCK(vp, 0); 585 vrele(vp); 586 MNT_VNODE_FOREACH_ABORT(mp, mvp); 587 return (error); 588 } 589 ffs_load_inode(bp, ip, fs, ip->i_number); 590 ip->i_effnlink = ip->i_nlink; 591 brelse(bp); 592 VOP_UNLOCK(vp, 0); 593 vrele(vp); 594 MNT_ILOCK(mp); 595 } 596 MNT_IUNLOCK(mp); 597 return (0); 598 } 599 600 /* 601 * Possible superblock locations ordered from most to least likely. 602 */ 603 static int sblock_try[] = SBLOCKSEARCH; 604 605 /* 606 * Common code for mount and mountroot 607 */ 608 static int 609 ffs_mountfs(devvp, mp, td) 610 struct vnode *devvp; 611 struct mount *mp; 612 struct thread *td; 613 { 614 struct ufsmount *ump; 615 struct buf *bp; 616 struct fs *fs; 617 struct cdev *dev; 618 void *space; 619 ufs2_daddr_t sblockloc; 620 int error, i, blks, size, ronly; 621 int32_t *lp; 622 struct ucred *cred; 623 struct g_consumer *cp; 624 struct mount *nmp; 625 626 bp = NULL; 627 ump = NULL; 628 cred = td ? td->td_ucred : NOCRED; 629 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 630 631 dev = devvp->v_rdev; 632 dev_ref(dev); 633 DROP_GIANT(); 634 g_topology_lock(); 635 error = g_vfs_open(devvp, &cp, "ffs", ronly ? 0 : 1); 636 637 /* 638 * If we are a root mount, drop the E flag so fsck can do its magic. 639 * We will pick it up again when we remount R/W. 640 */ 641 if (error == 0 && ronly && (mp->mnt_flag & MNT_ROOTFS)) 642 error = g_access(cp, 0, 0, -1); 643 g_topology_unlock(); 644 PICKUP_GIANT(); 645 VOP_UNLOCK(devvp, 0); 646 if (error) 647 goto out; 648 if (devvp->v_rdev->si_iosize_max != 0) 649 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 650 if (mp->mnt_iosize_max > MAXPHYS) 651 mp->mnt_iosize_max = MAXPHYS; 652 653 devvp->v_bufobj.bo_private = cp; 654 devvp->v_bufobj.bo_ops = &ffs_ops; 655 656 fs = NULL; 657 sblockloc = 0; 658 /* 659 * Try reading the superblock in each of its possible locations. 660 */ 661 for (i = 0; sblock_try[i] != -1; i++) { 662 if ((SBLOCKSIZE % cp->provider->sectorsize) != 0) { 663 error = EINVAL; 664 vfs_mount_error(mp, 665 "Invalid sectorsize %d for superblock size %d", 666 cp->provider->sectorsize, SBLOCKSIZE); 667 goto out; 668 } 669 if ((error = bread(devvp, btodb(sblock_try[i]), SBLOCKSIZE, 670 cred, &bp)) != 0) 671 goto out; 672 fs = (struct fs *)bp->b_data; 673 sblockloc = sblock_try[i]; 674 if ((fs->fs_magic == FS_UFS1_MAGIC || 675 (fs->fs_magic == FS_UFS2_MAGIC && 676 (fs->fs_sblockloc == sblockloc || 677 (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0))) && 678 fs->fs_bsize <= MAXBSIZE && 679 fs->fs_bsize >= sizeof(struct fs)) 680 break; 681 brelse(bp); 682 bp = NULL; 683 } 684 if (sblock_try[i] == -1) { 685 error = EINVAL; /* XXX needs translation */ 686 goto out; 687 } 688 fs->fs_fmod = 0; 689 fs->fs_flags &= ~FS_INDEXDIRS; /* no support for directory indicies */ 690 fs->fs_flags &= ~FS_UNCLEAN; 691 if (fs->fs_clean == 0) { 692 fs->fs_flags |= FS_UNCLEAN; 693 if (ronly || (mp->mnt_flag & MNT_FORCE) || 694 ((fs->fs_flags & FS_NEEDSFSCK) == 0 && 695 (fs->fs_flags & FS_DOSOFTDEP))) { 696 printf( 697 "WARNING: %s was not properly dismounted\n", 698 fs->fs_fsmnt); 699 } else { 700 printf( 701 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 702 fs->fs_fsmnt); 703 error = EPERM; 704 goto out; 705 } 706 if ((fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) && 707 (mp->mnt_flag & MNT_FORCE)) { 708 printf("%s: lost blocks %jd files %d\n", fs->fs_fsmnt, 709 (intmax_t)fs->fs_pendingblocks, 710 fs->fs_pendinginodes); 711 fs->fs_pendingblocks = 0; 712 fs->fs_pendinginodes = 0; 713 } 714 } 715 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 716 printf("%s: mount pending error: blocks %jd files %d\n", 717 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 718 fs->fs_pendinginodes); 719 fs->fs_pendingblocks = 0; 720 fs->fs_pendinginodes = 0; 721 } 722 if ((fs->fs_flags & FS_GJOURNAL) != 0) { 723 #ifdef UFS_GJOURNAL 724 /* 725 * Get journal provider name. 726 */ 727 size = 1024; 728 mp->mnt_gjprovider = malloc(size, M_UFSMNT, M_WAITOK); 729 if (g_io_getattr("GJOURNAL::provider", cp, &size, 730 mp->mnt_gjprovider) == 0) { 731 mp->mnt_gjprovider = realloc(mp->mnt_gjprovider, size, 732 M_UFSMNT, M_WAITOK); 733 MNT_ILOCK(mp); 734 mp->mnt_flag |= MNT_GJOURNAL; 735 MNT_IUNLOCK(mp); 736 } else { 737 printf( 738 "WARNING: %s: GJOURNAL flag on fs but no gjournal provider below\n", 739 mp->mnt_stat.f_mntonname); 740 free(mp->mnt_gjprovider, M_UFSMNT); 741 mp->mnt_gjprovider = NULL; 742 } 743 #else 744 printf( 745 "WARNING: %s: GJOURNAL flag on fs but no UFS_GJOURNAL support\n", 746 mp->mnt_stat.f_mntonname); 747 #endif 748 } else { 749 mp->mnt_gjprovider = NULL; 750 } 751 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO); 752 ump->um_cp = cp; 753 ump->um_bo = &devvp->v_bufobj; 754 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, M_WAITOK); 755 if (fs->fs_magic == FS_UFS1_MAGIC) { 756 ump->um_fstype = UFS1; 757 ump->um_balloc = ffs_balloc_ufs1; 758 } else { 759 ump->um_fstype = UFS2; 760 ump->um_balloc = ffs_balloc_ufs2; 761 } 762 ump->um_blkatoff = ffs_blkatoff; 763 ump->um_truncate = ffs_truncate; 764 ump->um_update = ffs_update; 765 ump->um_valloc = ffs_valloc; 766 ump->um_vfree = ffs_vfree; 767 ump->um_ifree = ffs_ifree; 768 ump->um_rdonly = ffs_rdonly; 769 mtx_init(UFS_MTX(ump), "FFS", "FFS Lock", MTX_DEF); 770 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 771 if (fs->fs_sbsize < SBLOCKSIZE) 772 bp->b_flags |= B_INVAL | B_NOCACHE; 773 brelse(bp); 774 bp = NULL; 775 fs = ump->um_fs; 776 ffs_oldfscompat_read(fs, ump, sblockloc); 777 fs->fs_ronly = ronly; 778 size = fs->fs_cssize; 779 blks = howmany(size, fs->fs_fsize); 780 if (fs->fs_contigsumsize > 0) 781 size += fs->fs_ncg * sizeof(int32_t); 782 size += fs->fs_ncg * sizeof(u_int8_t); 783 space = malloc((u_long)size, M_UFSMNT, M_WAITOK); 784 fs->fs_csp = space; 785 for (i = 0; i < blks; i += fs->fs_frag) { 786 size = fs->fs_bsize; 787 if (i + fs->fs_frag > blks) 788 size = (blks - i) * fs->fs_fsize; 789 if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 790 cred, &bp)) != 0) { 791 free(fs->fs_csp, M_UFSMNT); 792 goto out; 793 } 794 bcopy(bp->b_data, space, (u_int)size); 795 space = (char *)space + size; 796 brelse(bp); 797 bp = NULL; 798 } 799 if (fs->fs_contigsumsize > 0) { 800 fs->fs_maxcluster = lp = space; 801 for (i = 0; i < fs->fs_ncg; i++) 802 *lp++ = fs->fs_contigsumsize; 803 space = lp; 804 } 805 size = fs->fs_ncg * sizeof(u_int8_t); 806 fs->fs_contigdirs = (u_int8_t *)space; 807 bzero(fs->fs_contigdirs, size); 808 fs->fs_active = NULL; 809 mp->mnt_data = ump; 810 mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0]; 811 mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1]; 812 nmp = NULL; 813 if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 || 814 (nmp = vfs_getvfs(&mp->mnt_stat.f_fsid))) { 815 if (nmp) 816 vfs_rel(nmp); 817 vfs_getnewfsid(mp); 818 } 819 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 820 MNT_ILOCK(mp); 821 mp->mnt_flag |= MNT_LOCAL; 822 MNT_IUNLOCK(mp); 823 if ((fs->fs_flags & FS_MULTILABEL) != 0) { 824 #ifdef MAC 825 MNT_ILOCK(mp); 826 mp->mnt_flag |= MNT_MULTILABEL; 827 MNT_IUNLOCK(mp); 828 #else 829 printf( 830 "WARNING: %s: multilabel flag on fs but no MAC support\n", 831 mp->mnt_stat.f_mntonname); 832 #endif 833 } 834 if ((fs->fs_flags & FS_ACLS) != 0) { 835 #ifdef UFS_ACL 836 MNT_ILOCK(mp); 837 mp->mnt_flag |= MNT_ACLS; 838 MNT_IUNLOCK(mp); 839 #else 840 printf( 841 "WARNING: %s: ACLs flag on fs but no ACLs support\n", 842 mp->mnt_stat.f_mntonname); 843 #endif 844 } 845 ump->um_mountp = mp; 846 ump->um_dev = dev; 847 ump->um_devvp = devvp; 848 ump->um_nindir = fs->fs_nindir; 849 ump->um_bptrtodb = fs->fs_fsbtodb; 850 ump->um_seqinc = fs->fs_frag; 851 for (i = 0; i < MAXQUOTAS; i++) 852 ump->um_quotas[i] = NULLVP; 853 #ifdef UFS_EXTATTR 854 ufs_extattr_uepm_init(&ump->um_extattr); 855 #endif 856 /* 857 * Set FS local "last mounted on" information (NULL pad) 858 */ 859 bzero(fs->fs_fsmnt, MAXMNTLEN); 860 strlcpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MAXMNTLEN); 861 862 if( mp->mnt_flag & MNT_ROOTFS) { 863 /* 864 * Root mount; update timestamp in mount structure. 865 * this will be used by the common root mount code 866 * to update the system clock. 867 */ 868 mp->mnt_time = fs->fs_time; 869 } 870 871 if (ronly == 0) { 872 if ((fs->fs_flags & FS_DOSOFTDEP) && 873 (error = softdep_mount(devvp, mp, fs, cred)) != 0) { 874 free(fs->fs_csp, M_UFSMNT); 875 goto out; 876 } 877 if (fs->fs_snapinum[0] != 0) 878 ffs_snapshot_mount(mp); 879 fs->fs_fmod = 1; 880 fs->fs_clean = 0; 881 (void) ffs_sbupdate(ump, MNT_WAIT, 0); 882 } 883 /* 884 * Initialize filesystem stat information in mount struct. 885 */ 886 MNT_ILOCK(mp); 887 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 888 MNTK_EXTENDED_SHARED; 889 MNT_IUNLOCK(mp); 890 #ifdef UFS_EXTATTR 891 #ifdef UFS_EXTATTR_AUTOSTART 892 /* 893 * 894 * Auto-starting does the following: 895 * - check for /.attribute in the fs, and extattr_start if so 896 * - for each file in .attribute, enable that file with 897 * an attribute of the same name. 898 * Not clear how to report errors -- probably eat them. 899 * This would all happen while the filesystem was busy/not 900 * available, so would effectively be "atomic". 901 */ 902 mp->mnt_stat.f_iosize = fs->fs_bsize; 903 (void) ufs_extattr_autostart(mp, td); 904 #endif /* !UFS_EXTATTR_AUTOSTART */ 905 #endif /* !UFS_EXTATTR */ 906 return (0); 907 out: 908 if (bp) 909 brelse(bp); 910 if (cp != NULL) { 911 DROP_GIANT(); 912 g_topology_lock(); 913 g_vfs_close(cp); 914 g_topology_unlock(); 915 PICKUP_GIANT(); 916 } 917 if (ump) { 918 mtx_destroy(UFS_MTX(ump)); 919 if (mp->mnt_gjprovider != NULL) { 920 free(mp->mnt_gjprovider, M_UFSMNT); 921 mp->mnt_gjprovider = NULL; 922 } 923 free(ump->um_fs, M_UFSMNT); 924 free(ump, M_UFSMNT); 925 mp->mnt_data = NULL; 926 } 927 dev_rel(dev); 928 return (error); 929 } 930 931 #include <sys/sysctl.h> 932 static int bigcgs = 0; 933 SYSCTL_INT(_debug, OID_AUTO, bigcgs, CTLFLAG_RW, &bigcgs, 0, ""); 934 935 /* 936 * Sanity checks for loading old filesystem superblocks. 937 * See ffs_oldfscompat_write below for unwound actions. 938 * 939 * XXX - Parts get retired eventually. 940 * Unfortunately new bits get added. 941 */ 942 static void 943 ffs_oldfscompat_read(fs, ump, sblockloc) 944 struct fs *fs; 945 struct ufsmount *ump; 946 ufs2_daddr_t sblockloc; 947 { 948 off_t maxfilesize; 949 950 /* 951 * If not yet done, update fs_flags location and value of fs_sblockloc. 952 */ 953 if ((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 954 fs->fs_flags = fs->fs_old_flags; 955 fs->fs_old_flags |= FS_FLAGS_UPDATED; 956 fs->fs_sblockloc = sblockloc; 957 } 958 /* 959 * If not yet done, update UFS1 superblock with new wider fields. 960 */ 961 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_maxbsize != fs->fs_bsize) { 962 fs->fs_maxbsize = fs->fs_bsize; 963 fs->fs_time = fs->fs_old_time; 964 fs->fs_size = fs->fs_old_size; 965 fs->fs_dsize = fs->fs_old_dsize; 966 fs->fs_csaddr = fs->fs_old_csaddr; 967 fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir; 968 fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree; 969 fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree; 970 fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree; 971 } 972 if (fs->fs_magic == FS_UFS1_MAGIC && 973 fs->fs_old_inodefmt < FS_44INODEFMT) { 974 fs->fs_maxfilesize = ((uint64_t)1 << 31) - 1; 975 fs->fs_qbmask = ~fs->fs_bmask; 976 fs->fs_qfmask = ~fs->fs_fmask; 977 } 978 if (fs->fs_magic == FS_UFS1_MAGIC) { 979 ump->um_savedmaxfilesize = fs->fs_maxfilesize; 980 maxfilesize = (uint64_t)0x80000000 * fs->fs_bsize - 1; 981 if (fs->fs_maxfilesize > maxfilesize) 982 fs->fs_maxfilesize = maxfilesize; 983 } 984 /* Compatibility for old filesystems */ 985 if (fs->fs_avgfilesize <= 0) 986 fs->fs_avgfilesize = AVFILESIZ; 987 if (fs->fs_avgfpdir <= 0) 988 fs->fs_avgfpdir = AFPDIR; 989 if (bigcgs) { 990 fs->fs_save_cgsize = fs->fs_cgsize; 991 fs->fs_cgsize = fs->fs_bsize; 992 } 993 } 994 995 /* 996 * Unwinding superblock updates for old filesystems. 997 * See ffs_oldfscompat_read above for details. 998 * 999 * XXX - Parts get retired eventually. 1000 * Unfortunately new bits get added. 1001 */ 1002 static void 1003 ffs_oldfscompat_write(fs, ump) 1004 struct fs *fs; 1005 struct ufsmount *ump; 1006 { 1007 1008 /* 1009 * Copy back UFS2 updated fields that UFS1 inspects. 1010 */ 1011 if (fs->fs_magic == FS_UFS1_MAGIC) { 1012 fs->fs_old_time = fs->fs_time; 1013 fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir; 1014 fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree; 1015 fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree; 1016 fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree; 1017 fs->fs_maxfilesize = ump->um_savedmaxfilesize; 1018 } 1019 if (bigcgs) { 1020 fs->fs_cgsize = fs->fs_save_cgsize; 1021 fs->fs_save_cgsize = 0; 1022 } 1023 } 1024 1025 /* 1026 * unmount system call 1027 */ 1028 static int 1029 ffs_unmount(mp, mntflags) 1030 struct mount *mp; 1031 int mntflags; 1032 { 1033 struct thread *td; 1034 struct ufsmount *ump = VFSTOUFS(mp); 1035 struct fs *fs; 1036 int error, flags, susp; 1037 #ifdef UFS_EXTATTR 1038 int e_restart; 1039 #endif 1040 1041 flags = 0; 1042 td = curthread; 1043 fs = ump->um_fs; 1044 if (mntflags & MNT_FORCE) { 1045 flags |= FORCECLOSE; 1046 susp = fs->fs_ronly != 0; 1047 } else 1048 susp = 0; 1049 #ifdef UFS_EXTATTR 1050 if ((error = ufs_extattr_stop(mp, td))) { 1051 if (error != EOPNOTSUPP) 1052 printf("ffs_unmount: ufs_extattr_stop returned %d\n", 1053 error); 1054 e_restart = 0; 1055 } else { 1056 ufs_extattr_uepm_destroy(&ump->um_extattr); 1057 e_restart = 1; 1058 } 1059 #endif 1060 if (susp) { 1061 /* 1062 * dounmount already called vn_start_write(). 1063 */ 1064 for (;;) { 1065 vn_finished_write(mp); 1066 if ((error = vfs_write_suspend(mp)) != 0) 1067 return (error); 1068 MNT_ILOCK(mp); 1069 if (mp->mnt_kern_flag & MNTK_SUSPENDED) { 1070 mp->mnt_kern_flag &= ~(MNTK_SUSPENDED | 1071 MNTK_SUSPEND2); 1072 wakeup(&mp->mnt_flag); 1073 MNT_IUNLOCK(mp); 1074 td->td_pflags |= TDP_IGNSUSP; 1075 break; 1076 } 1077 MNT_IUNLOCK(mp); 1078 vn_start_write(NULL, &mp, V_WAIT); 1079 } 1080 } 1081 if (mp->mnt_flag & MNT_SOFTDEP) 1082 error = softdep_flushfiles(mp, flags, td); 1083 else 1084 error = ffs_flushfiles(mp, flags, td); 1085 if (error != 0 && error != ENXIO) 1086 goto fail; 1087 1088 UFS_LOCK(ump); 1089 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 1090 printf("%s: unmount pending error: blocks %jd files %d\n", 1091 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 1092 fs->fs_pendinginodes); 1093 fs->fs_pendingblocks = 0; 1094 fs->fs_pendinginodes = 0; 1095 } 1096 UFS_UNLOCK(ump); 1097 if (fs->fs_ronly == 0) { 1098 fs->fs_clean = fs->fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK) ? 0 : 1; 1099 error = ffs_sbupdate(ump, MNT_WAIT, 0); 1100 if (error && error != ENXIO) { 1101 fs->fs_clean = 0; 1102 goto fail; 1103 } 1104 } 1105 if (susp) { 1106 vfs_write_resume(mp); 1107 vn_start_write(NULL, &mp, V_WAIT); 1108 } 1109 DROP_GIANT(); 1110 g_topology_lock(); 1111 g_vfs_close(ump->um_cp); 1112 g_topology_unlock(); 1113 PICKUP_GIANT(); 1114 vrele(ump->um_devvp); 1115 dev_rel(ump->um_dev); 1116 mtx_destroy(UFS_MTX(ump)); 1117 if (mp->mnt_gjprovider != NULL) { 1118 free(mp->mnt_gjprovider, M_UFSMNT); 1119 mp->mnt_gjprovider = NULL; 1120 } 1121 free(fs->fs_csp, M_UFSMNT); 1122 free(fs, M_UFSMNT); 1123 free(ump, M_UFSMNT); 1124 mp->mnt_data = NULL; 1125 MNT_ILOCK(mp); 1126 mp->mnt_flag &= ~MNT_LOCAL; 1127 MNT_IUNLOCK(mp); 1128 return (error); 1129 1130 fail: 1131 if (susp) { 1132 vfs_write_resume(mp); 1133 vn_start_write(NULL, &mp, V_WAIT); 1134 } 1135 #ifdef UFS_EXTATTR 1136 if (e_restart) { 1137 ufs_extattr_uepm_init(&ump->um_extattr); 1138 #ifdef UFS_EXTATTR_AUTOSTART 1139 (void) ufs_extattr_autostart(mp, td); 1140 #endif 1141 } 1142 #endif 1143 1144 return (error); 1145 } 1146 1147 /* 1148 * Flush out all the files in a filesystem. 1149 */ 1150 int 1151 ffs_flushfiles(mp, flags, td) 1152 struct mount *mp; 1153 int flags; 1154 struct thread *td; 1155 { 1156 struct ufsmount *ump; 1157 int error; 1158 1159 ump = VFSTOUFS(mp); 1160 #ifdef QUOTA 1161 if (mp->mnt_flag & MNT_QUOTA) { 1162 int i; 1163 error = vflush(mp, 0, SKIPSYSTEM|flags, td); 1164 if (error) 1165 return (error); 1166 for (i = 0; i < MAXQUOTAS; i++) { 1167 quotaoff(td, mp, i); 1168 } 1169 /* 1170 * Here we fall through to vflush again to ensure 1171 * that we have gotten rid of all the system vnodes. 1172 */ 1173 } 1174 #endif 1175 ASSERT_VOP_LOCKED(ump->um_devvp, "ffs_flushfiles"); 1176 if (ump->um_devvp->v_vflag & VV_COPYONWRITE) { 1177 if ((error = vflush(mp, 0, SKIPSYSTEM | flags, td)) != 0) 1178 return (error); 1179 ffs_snapshot_unmount(mp); 1180 flags |= FORCECLOSE; 1181 /* 1182 * Here we fall through to vflush again to ensure 1183 * that we have gotten rid of all the system vnodes. 1184 */ 1185 } 1186 /* 1187 * Flush all the files. 1188 */ 1189 if ((error = vflush(mp, 0, flags, td)) != 0) 1190 return (error); 1191 /* 1192 * Flush filesystem metadata. 1193 */ 1194 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1195 error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td); 1196 VOP_UNLOCK(ump->um_devvp, 0); 1197 return (error); 1198 } 1199 1200 /* 1201 * Get filesystem statistics. 1202 */ 1203 static int 1204 ffs_statfs(mp, sbp) 1205 struct mount *mp; 1206 struct statfs *sbp; 1207 { 1208 struct ufsmount *ump; 1209 struct fs *fs; 1210 1211 ump = VFSTOUFS(mp); 1212 fs = ump->um_fs; 1213 if (fs->fs_magic != FS_UFS1_MAGIC && fs->fs_magic != FS_UFS2_MAGIC) 1214 panic("ffs_statfs"); 1215 sbp->f_version = STATFS_VERSION; 1216 sbp->f_bsize = fs->fs_fsize; 1217 sbp->f_iosize = fs->fs_bsize; 1218 sbp->f_blocks = fs->fs_dsize; 1219 UFS_LOCK(ump); 1220 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 1221 fs->fs_cstotal.cs_nffree + dbtofsb(fs, fs->fs_pendingblocks); 1222 sbp->f_bavail = freespace(fs, fs->fs_minfree) + 1223 dbtofsb(fs, fs->fs_pendingblocks); 1224 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 1225 sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes; 1226 UFS_UNLOCK(ump); 1227 sbp->f_namemax = NAME_MAX; 1228 return (0); 1229 } 1230 1231 /* 1232 * Go through the disk queues to initiate sandbagged IO; 1233 * go through the inodes to write those that have been modified; 1234 * initiate the writing of the super block if it has been modified. 1235 * 1236 * Note: we are always called with the filesystem marked `MPBUSY'. 1237 */ 1238 static int 1239 ffs_sync(mp, waitfor) 1240 struct mount *mp; 1241 int waitfor; 1242 { 1243 struct vnode *mvp, *vp, *devvp; 1244 struct thread *td; 1245 struct inode *ip; 1246 struct ufsmount *ump = VFSTOUFS(mp); 1247 struct fs *fs; 1248 int error, count, wait, lockreq, allerror = 0; 1249 int suspend; 1250 int suspended; 1251 int secondary_writes; 1252 int secondary_accwrites; 1253 int softdep_deps; 1254 int softdep_accdeps; 1255 struct bufobj *bo; 1256 1257 td = curthread; 1258 fs = ump->um_fs; 1259 if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */ 1260 printf("fs = %s\n", fs->fs_fsmnt); 1261 panic("ffs_sync: rofs mod"); 1262 } 1263 /* 1264 * Write back each (modified) inode. 1265 */ 1266 wait = 0; 1267 suspend = 0; 1268 suspended = 0; 1269 lockreq = LK_EXCLUSIVE | LK_NOWAIT; 1270 if (waitfor == MNT_SUSPEND) { 1271 suspend = 1; 1272 waitfor = MNT_WAIT; 1273 } 1274 if (waitfor == MNT_WAIT) { 1275 wait = 1; 1276 lockreq = LK_EXCLUSIVE; 1277 } 1278 lockreq |= LK_INTERLOCK | LK_SLEEPFAIL; 1279 MNT_ILOCK(mp); 1280 loop: 1281 /* Grab snapshot of secondary write counts */ 1282 secondary_writes = mp->mnt_secondary_writes; 1283 secondary_accwrites = mp->mnt_secondary_accwrites; 1284 1285 /* Grab snapshot of softdep dependency counts */ 1286 MNT_IUNLOCK(mp); 1287 softdep_get_depcounts(mp, &softdep_deps, &softdep_accdeps); 1288 MNT_ILOCK(mp); 1289 1290 MNT_VNODE_FOREACH(vp, mp, mvp) { 1291 /* 1292 * Depend on the mntvnode_slock to keep things stable enough 1293 * for a quick test. Since there might be hundreds of 1294 * thousands of vnodes, we cannot afford even a subroutine 1295 * call unless there's a good chance that we have work to do. 1296 */ 1297 VI_LOCK(vp); 1298 if (vp->v_iflag & VI_DOOMED) { 1299 VI_UNLOCK(vp); 1300 continue; 1301 } 1302 ip = VTOI(vp); 1303 if (vp->v_type == VNON || ((ip->i_flag & 1304 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 1305 vp->v_bufobj.bo_dirty.bv_cnt == 0)) { 1306 VI_UNLOCK(vp); 1307 continue; 1308 } 1309 MNT_IUNLOCK(mp); 1310 if ((error = vget(vp, lockreq, td)) != 0) { 1311 MNT_ILOCK(mp); 1312 if (error == ENOENT || error == ENOLCK) { 1313 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 1314 goto loop; 1315 } 1316 continue; 1317 } 1318 if ((error = ffs_syncvnode(vp, waitfor)) != 0) 1319 allerror = error; 1320 vput(vp); 1321 MNT_ILOCK(mp); 1322 } 1323 MNT_IUNLOCK(mp); 1324 /* 1325 * Force stale filesystem control information to be flushed. 1326 */ 1327 if (waitfor == MNT_WAIT) { 1328 if ((error = softdep_flushworklist(ump->um_mountp, &count, td))) 1329 allerror = error; 1330 /* Flushed work items may create new vnodes to clean */ 1331 if (allerror == 0 && count) { 1332 MNT_ILOCK(mp); 1333 goto loop; 1334 } 1335 } 1336 #ifdef QUOTA 1337 qsync(mp); 1338 #endif 1339 devvp = ump->um_devvp; 1340 bo = &devvp->v_bufobj; 1341 BO_LOCK(bo); 1342 if (waitfor != MNT_LAZY && 1343 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) { 1344 BO_UNLOCK(bo); 1345 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1346 if ((error = VOP_FSYNC(devvp, waitfor, td)) != 0) 1347 allerror = error; 1348 VOP_UNLOCK(devvp, 0); 1349 if (allerror == 0 && waitfor == MNT_WAIT) { 1350 MNT_ILOCK(mp); 1351 goto loop; 1352 } 1353 } else if (suspend != 0) { 1354 if (softdep_check_suspend(mp, 1355 devvp, 1356 softdep_deps, 1357 softdep_accdeps, 1358 secondary_writes, 1359 secondary_accwrites) != 0) 1360 goto loop; /* More work needed */ 1361 mtx_assert(MNT_MTX(mp), MA_OWNED); 1362 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 1363 MNT_IUNLOCK(mp); 1364 suspended = 1; 1365 } else 1366 BO_UNLOCK(bo); 1367 /* 1368 * Write back modified superblock. 1369 */ 1370 if (fs->fs_fmod != 0 && 1371 (error = ffs_sbupdate(ump, waitfor, suspended)) != 0) 1372 allerror = error; 1373 return (allerror); 1374 } 1375 1376 int 1377 ffs_vget(mp, ino, flags, vpp) 1378 struct mount *mp; 1379 ino_t ino; 1380 int flags; 1381 struct vnode **vpp; 1382 { 1383 return (ffs_vgetf(mp, ino, flags, vpp, 0)); 1384 } 1385 1386 int 1387 ffs_vgetf(mp, ino, flags, vpp, ffs_flags) 1388 struct mount *mp; 1389 ino_t ino; 1390 int flags; 1391 struct vnode **vpp; 1392 int ffs_flags; 1393 { 1394 struct fs *fs; 1395 struct inode *ip; 1396 struct ufsmount *ump; 1397 struct buf *bp; 1398 struct vnode *vp; 1399 struct cdev *dev; 1400 int error; 1401 1402 error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL); 1403 if (error || *vpp != NULL) 1404 return (error); 1405 1406 /* 1407 * We must promote to an exclusive lock for vnode creation. This 1408 * can happen if lookup is passed LOCKSHARED. 1409 */ 1410 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 1411 flags &= ~LK_TYPE_MASK; 1412 flags |= LK_EXCLUSIVE; 1413 } 1414 1415 /* 1416 * We do not lock vnode creation as it is believed to be too 1417 * expensive for such rare case as simultaneous creation of vnode 1418 * for same ino by different processes. We just allow them to race 1419 * and check later to decide who wins. Let the race begin! 1420 */ 1421 1422 ump = VFSTOUFS(mp); 1423 dev = ump->um_dev; 1424 fs = ump->um_fs; 1425 1426 /* 1427 * If this malloc() is performed after the getnewvnode() 1428 * it might block, leaving a vnode with a NULL v_data to be 1429 * found by ffs_sync() if a sync happens to fire right then, 1430 * which will cause a panic because ffs_sync() blindly 1431 * dereferences vp->v_data (as well it should). 1432 */ 1433 ip = uma_zalloc(uma_inode, M_WAITOK | M_ZERO); 1434 1435 /* Allocate a new vnode/inode. */ 1436 if (fs->fs_magic == FS_UFS1_MAGIC) 1437 error = getnewvnode("ufs", mp, &ffs_vnodeops1, &vp); 1438 else 1439 error = getnewvnode("ufs", mp, &ffs_vnodeops2, &vp); 1440 if (error) { 1441 *vpp = NULL; 1442 uma_zfree(uma_inode, ip); 1443 return (error); 1444 } 1445 /* 1446 * FFS supports recursive locking. 1447 */ 1448 VN_LOCK_AREC(vp); 1449 vp->v_data = ip; 1450 vp->v_bufobj.bo_bsize = fs->fs_bsize; 1451 ip->i_vnode = vp; 1452 ip->i_ump = ump; 1453 ip->i_fs = fs; 1454 ip->i_dev = dev; 1455 ip->i_number = ino; 1456 ip->i_ea_refs = 0; 1457 #ifdef QUOTA 1458 { 1459 int i; 1460 for (i = 0; i < MAXQUOTAS; i++) 1461 ip->i_dquot[i] = NODQUOT; 1462 } 1463 #endif 1464 1465 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1466 if (ffs_flags & FFSV_FORCEINSMQ) 1467 vp->v_vflag |= VV_FORCEINSMQ; 1468 error = insmntque(vp, mp); 1469 if (error != 0) { 1470 uma_zfree(uma_inode, ip); 1471 *vpp = NULL; 1472 return (error); 1473 } 1474 vp->v_vflag &= ~VV_FORCEINSMQ; 1475 error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL); 1476 if (error || *vpp != NULL) 1477 return (error); 1478 1479 /* Read in the disk contents for the inode, copy into the inode. */ 1480 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1481 (int)fs->fs_bsize, NOCRED, &bp); 1482 if (error) { 1483 /* 1484 * The inode does not contain anything useful, so it would 1485 * be misleading to leave it on its hash chain. With mode 1486 * still zero, it will be unlinked and returned to the free 1487 * list by vput(). 1488 */ 1489 brelse(bp); 1490 vput(vp); 1491 *vpp = NULL; 1492 return (error); 1493 } 1494 if (ip->i_ump->um_fstype == UFS1) 1495 ip->i_din1 = uma_zalloc(uma_ufs1, M_WAITOK); 1496 else 1497 ip->i_din2 = uma_zalloc(uma_ufs2, M_WAITOK); 1498 ffs_load_inode(bp, ip, fs, ino); 1499 if (DOINGSOFTDEP(vp)) 1500 softdep_load_inodeblock(ip); 1501 else 1502 ip->i_effnlink = ip->i_nlink; 1503 bqrelse(bp); 1504 1505 /* 1506 * Initialize the vnode from the inode, check for aliases. 1507 * Note that the underlying vnode may have changed. 1508 */ 1509 if (ip->i_ump->um_fstype == UFS1) 1510 error = ufs_vinit(mp, &ffs_fifoops1, &vp); 1511 else 1512 error = ufs_vinit(mp, &ffs_fifoops2, &vp); 1513 if (error) { 1514 vput(vp); 1515 *vpp = NULL; 1516 return (error); 1517 } 1518 1519 /* 1520 * Finish inode initialization. 1521 */ 1522 if (vp->v_type != VFIFO) { 1523 /* FFS supports shared locking for all files except fifos. */ 1524 VN_LOCK_ASHARE(vp); 1525 } 1526 1527 /* 1528 * Set up a generation number for this inode if it does not 1529 * already have one. This should only happen on old filesystems. 1530 */ 1531 if (ip->i_gen == 0) { 1532 ip->i_gen = arc4random() / 2 + 1; 1533 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 1534 ip->i_flag |= IN_MODIFIED; 1535 DIP_SET(ip, i_gen, ip->i_gen); 1536 } 1537 } 1538 /* 1539 * Ensure that uid and gid are correct. This is a temporary 1540 * fix until fsck has been changed to do the update. 1541 */ 1542 if (fs->fs_magic == FS_UFS1_MAGIC && /* XXX */ 1543 fs->fs_old_inodefmt < FS_44INODEFMT) { /* XXX */ 1544 ip->i_uid = ip->i_din1->di_ouid; /* XXX */ 1545 ip->i_gid = ip->i_din1->di_ogid; /* XXX */ 1546 } /* XXX */ 1547 1548 #ifdef MAC 1549 if ((mp->mnt_flag & MNT_MULTILABEL) && ip->i_mode) { 1550 /* 1551 * If this vnode is already allocated, and we're running 1552 * multi-label, attempt to perform a label association 1553 * from the extended attributes on the inode. 1554 */ 1555 error = mac_vnode_associate_extattr(mp, vp); 1556 if (error) { 1557 /* ufs_inactive will release ip->i_devvp ref. */ 1558 vput(vp); 1559 *vpp = NULL; 1560 return (error); 1561 } 1562 } 1563 #endif 1564 1565 *vpp = vp; 1566 return (0); 1567 } 1568 1569 /* 1570 * File handle to vnode 1571 * 1572 * Have to be really careful about stale file handles: 1573 * - check that the inode number is valid 1574 * - call ffs_vget() to get the locked inode 1575 * - check for an unallocated inode (i_mode == 0) 1576 * - check that the given client host has export rights and return 1577 * those rights via. exflagsp and credanonp 1578 */ 1579 static int 1580 ffs_fhtovp(mp, fhp, vpp) 1581 struct mount *mp; 1582 struct fid *fhp; 1583 struct vnode **vpp; 1584 { 1585 struct ufid *ufhp; 1586 struct fs *fs; 1587 1588 ufhp = (struct ufid *)fhp; 1589 fs = VFSTOUFS(mp)->um_fs; 1590 if (ufhp->ufid_ino < ROOTINO || 1591 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 1592 return (ESTALE); 1593 return (ufs_fhtovp(mp, ufhp, vpp)); 1594 } 1595 1596 /* 1597 * Initialize the filesystem. 1598 */ 1599 static int 1600 ffs_init(vfsp) 1601 struct vfsconf *vfsp; 1602 { 1603 1604 softdep_initialize(); 1605 return (ufs_init(vfsp)); 1606 } 1607 1608 /* 1609 * Undo the work of ffs_init(). 1610 */ 1611 static int 1612 ffs_uninit(vfsp) 1613 struct vfsconf *vfsp; 1614 { 1615 int ret; 1616 1617 ret = ufs_uninit(vfsp); 1618 softdep_uninitialize(); 1619 return (ret); 1620 } 1621 1622 /* 1623 * Write a superblock and associated information back to disk. 1624 */ 1625 int 1626 ffs_sbupdate(mp, waitfor, suspended) 1627 struct ufsmount *mp; 1628 int waitfor; 1629 int suspended; 1630 { 1631 struct fs *fs = mp->um_fs; 1632 struct buf *sbbp; 1633 struct buf *bp; 1634 int blks; 1635 void *space; 1636 int i, size, error, allerror = 0; 1637 1638 if (fs->fs_ronly == 1 && 1639 (mp->um_mountp->mnt_flag & (MNT_RDONLY | MNT_UPDATE)) != 1640 (MNT_RDONLY | MNT_UPDATE)) 1641 panic("ffs_sbupdate: write read-only filesystem"); 1642 /* 1643 * We use the superblock's buf to serialize calls to ffs_sbupdate(). 1644 */ 1645 sbbp = getblk(mp->um_devvp, btodb(fs->fs_sblockloc), (int)fs->fs_sbsize, 1646 0, 0, 0); 1647 /* 1648 * First write back the summary information. 1649 */ 1650 blks = howmany(fs->fs_cssize, fs->fs_fsize); 1651 space = fs->fs_csp; 1652 for (i = 0; i < blks; i += fs->fs_frag) { 1653 size = fs->fs_bsize; 1654 if (i + fs->fs_frag > blks) 1655 size = (blks - i) * fs->fs_fsize; 1656 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 1657 size, 0, 0, 0); 1658 bcopy(space, bp->b_data, (u_int)size); 1659 space = (char *)space + size; 1660 if (suspended) 1661 bp->b_flags |= B_VALIDSUSPWRT; 1662 if (waitfor != MNT_WAIT) 1663 bawrite(bp); 1664 else if ((error = bwrite(bp)) != 0) 1665 allerror = error; 1666 } 1667 /* 1668 * Now write back the superblock itself. If any errors occurred 1669 * up to this point, then fail so that the superblock avoids 1670 * being written out as clean. 1671 */ 1672 if (allerror) { 1673 brelse(sbbp); 1674 return (allerror); 1675 } 1676 bp = sbbp; 1677 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_sblockloc != SBLOCK_UFS1 && 1678 (fs->fs_flags & FS_FLAGS_UPDATED) == 0) { 1679 printf("%s: correcting fs_sblockloc from %jd to %d\n", 1680 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS1); 1681 fs->fs_sblockloc = SBLOCK_UFS1; 1682 } 1683 if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_sblockloc != SBLOCK_UFS2 && 1684 (fs->fs_flags & FS_FLAGS_UPDATED) == 0) { 1685 printf("%s: correcting fs_sblockloc from %jd to %d\n", 1686 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS2); 1687 fs->fs_sblockloc = SBLOCK_UFS2; 1688 } 1689 fs->fs_fmod = 0; 1690 fs->fs_time = time_second; 1691 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 1692 ffs_oldfscompat_write((struct fs *)bp->b_data, mp); 1693 if (suspended) 1694 bp->b_flags |= B_VALIDSUSPWRT; 1695 if (waitfor != MNT_WAIT) 1696 bawrite(bp); 1697 else if ((error = bwrite(bp)) != 0) 1698 allerror = error; 1699 return (allerror); 1700 } 1701 1702 static int 1703 ffs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1704 int attrnamespace, const char *attrname) 1705 { 1706 1707 #ifdef UFS_EXTATTR 1708 return (ufs_extattrctl(mp, cmd, filename_vp, attrnamespace, 1709 attrname)); 1710 #else 1711 return (vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, 1712 attrname)); 1713 #endif 1714 } 1715 1716 static void 1717 ffs_ifree(struct ufsmount *ump, struct inode *ip) 1718 { 1719 1720 if (ump->um_fstype == UFS1 && ip->i_din1 != NULL) 1721 uma_zfree(uma_ufs1, ip->i_din1); 1722 else if (ip->i_din2 != NULL) 1723 uma_zfree(uma_ufs2, ip->i_din2); 1724 uma_zfree(uma_inode, ip); 1725 } 1726 1727 static int dobkgrdwrite = 1; 1728 SYSCTL_INT(_debug, OID_AUTO, dobkgrdwrite, CTLFLAG_RW, &dobkgrdwrite, 0, 1729 "Do background writes (honoring the BV_BKGRDWRITE flag)?"); 1730 1731 /* 1732 * Complete a background write started from bwrite. 1733 */ 1734 static void 1735 ffs_backgroundwritedone(struct buf *bp) 1736 { 1737 struct bufobj *bufobj; 1738 struct buf *origbp; 1739 1740 /* 1741 * Find the original buffer that we are writing. 1742 */ 1743 bufobj = bp->b_bufobj; 1744 BO_LOCK(bufobj); 1745 if ((origbp = gbincore(bp->b_bufobj, bp->b_lblkno)) == NULL) 1746 panic("backgroundwritedone: lost buffer"); 1747 /* Grab an extra reference to be dropped by the bufdone() below. */ 1748 bufobj_wrefl(bufobj); 1749 BO_UNLOCK(bufobj); 1750 /* 1751 * Process dependencies then return any unfinished ones. 1752 */ 1753 if (!LIST_EMPTY(&bp->b_dep)) 1754 buf_complete(bp); 1755 #ifdef SOFTUPDATES 1756 if (!LIST_EMPTY(&bp->b_dep)) 1757 softdep_move_dependencies(bp, origbp); 1758 #endif 1759 /* 1760 * This buffer is marked B_NOCACHE so when it is released 1761 * by biodone it will be tossed. 1762 */ 1763 bp->b_flags |= B_NOCACHE; 1764 bp->b_flags &= ~B_CACHE; 1765 bufdone(bp); 1766 BO_LOCK(bufobj); 1767 /* 1768 * Clear the BV_BKGRDINPROG flag in the original buffer 1769 * and awaken it if it is waiting for the write to complete. 1770 * If BV_BKGRDINPROG is not set in the original buffer it must 1771 * have been released and re-instantiated - which is not legal. 1772 */ 1773 KASSERT((origbp->b_vflags & BV_BKGRDINPROG), 1774 ("backgroundwritedone: lost buffer2")); 1775 origbp->b_vflags &= ~BV_BKGRDINPROG; 1776 if (origbp->b_vflags & BV_BKGRDWAIT) { 1777 origbp->b_vflags &= ~BV_BKGRDWAIT; 1778 wakeup(&origbp->b_xflags); 1779 } 1780 BO_UNLOCK(bufobj); 1781 } 1782 1783 1784 /* 1785 * Write, release buffer on completion. (Done by iodone 1786 * if async). Do not bother writing anything if the buffer 1787 * is invalid. 1788 * 1789 * Note that we set B_CACHE here, indicating that buffer is 1790 * fully valid and thus cacheable. This is true even of NFS 1791 * now so we set it generally. This could be set either here 1792 * or in biodone() since the I/O is synchronous. We put it 1793 * here. 1794 */ 1795 static int 1796 ffs_bufwrite(struct buf *bp) 1797 { 1798 int oldflags, s; 1799 struct buf *newbp; 1800 1801 CTR3(KTR_BUF, "bufwrite(%p) vp %p flags %X", bp, bp->b_vp, bp->b_flags); 1802 if (bp->b_flags & B_INVAL) { 1803 brelse(bp); 1804 return (0); 1805 } 1806 1807 oldflags = bp->b_flags; 1808 1809 if (!BUF_ISLOCKED(bp)) 1810 panic("bufwrite: buffer is not busy???"); 1811 s = splbio(); 1812 /* 1813 * If a background write is already in progress, delay 1814 * writing this block if it is asynchronous. Otherwise 1815 * wait for the background write to complete. 1816 */ 1817 BO_LOCK(bp->b_bufobj); 1818 if (bp->b_vflags & BV_BKGRDINPROG) { 1819 if (bp->b_flags & B_ASYNC) { 1820 BO_UNLOCK(bp->b_bufobj); 1821 splx(s); 1822 bdwrite(bp); 1823 return (0); 1824 } 1825 bp->b_vflags |= BV_BKGRDWAIT; 1826 msleep(&bp->b_xflags, BO_MTX(bp->b_bufobj), PRIBIO, "bwrbg", 0); 1827 if (bp->b_vflags & BV_BKGRDINPROG) 1828 panic("bufwrite: still writing"); 1829 } 1830 BO_UNLOCK(bp->b_bufobj); 1831 1832 /* Mark the buffer clean */ 1833 bundirty(bp); 1834 1835 /* 1836 * If this buffer is marked for background writing and we 1837 * do not have to wait for it, make a copy and write the 1838 * copy so as to leave this buffer ready for further use. 1839 * 1840 * This optimization eats a lot of memory. If we have a page 1841 * or buffer shortfall we can't do it. 1842 */ 1843 if (dobkgrdwrite && (bp->b_xflags & BX_BKGRDWRITE) && 1844 (bp->b_flags & B_ASYNC) && 1845 !vm_page_count_severe() && 1846 !buf_dirty_count_severe()) { 1847 KASSERT(bp->b_iodone == NULL, 1848 ("bufwrite: needs chained iodone (%p)", bp->b_iodone)); 1849 1850 /* get a new block */ 1851 newbp = geteblk(bp->b_bufsize, GB_NOWAIT_BD); 1852 if (newbp == NULL) 1853 goto normal_write; 1854 1855 /* 1856 * set it to be identical to the old block. We have to 1857 * set b_lblkno and BKGRDMARKER before calling bgetvp() 1858 * to avoid confusing the splay tree and gbincore(). 1859 */ 1860 memcpy(newbp->b_data, bp->b_data, bp->b_bufsize); 1861 newbp->b_lblkno = bp->b_lblkno; 1862 newbp->b_xflags |= BX_BKGRDMARKER; 1863 BO_LOCK(bp->b_bufobj); 1864 bp->b_vflags |= BV_BKGRDINPROG; 1865 bgetvp(bp->b_vp, newbp); 1866 BO_UNLOCK(bp->b_bufobj); 1867 newbp->b_bufobj = &bp->b_vp->v_bufobj; 1868 newbp->b_blkno = bp->b_blkno; 1869 newbp->b_offset = bp->b_offset; 1870 newbp->b_iodone = ffs_backgroundwritedone; 1871 newbp->b_flags |= B_ASYNC; 1872 newbp->b_flags &= ~B_INVAL; 1873 1874 #ifdef SOFTUPDATES 1875 /* move over the dependencies */ 1876 if (!LIST_EMPTY(&bp->b_dep)) 1877 softdep_move_dependencies(bp, newbp); 1878 #endif 1879 1880 /* 1881 * Initiate write on the copy, release the original to 1882 * the B_LOCKED queue so that it cannot go away until 1883 * the background write completes. If not locked it could go 1884 * away and then be reconstituted while it was being written. 1885 * If the reconstituted buffer were written, we could end up 1886 * with two background copies being written at the same time. 1887 */ 1888 bqrelse(bp); 1889 bp = newbp; 1890 } 1891 1892 /* Let the normal bufwrite do the rest for us */ 1893 normal_write: 1894 return (bufwrite(bp)); 1895 } 1896 1897 1898 static void 1899 ffs_geom_strategy(struct bufobj *bo, struct buf *bp) 1900 { 1901 struct vnode *vp; 1902 int error; 1903 struct buf *tbp; 1904 1905 vp = bo->__bo_vnode; 1906 if (bp->b_iocmd == BIO_WRITE) { 1907 if ((bp->b_flags & B_VALIDSUSPWRT) == 0 && 1908 bp->b_vp != NULL && bp->b_vp->v_mount != NULL && 1909 (bp->b_vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED) != 0) 1910 panic("ffs_geom_strategy: bad I/O"); 1911 bp->b_flags &= ~B_VALIDSUSPWRT; 1912 if ((vp->v_vflag & VV_COPYONWRITE) && 1913 vp->v_rdev->si_snapdata != NULL) { 1914 if ((bp->b_flags & B_CLUSTER) != 0) { 1915 runningbufwakeup(bp); 1916 TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head, 1917 b_cluster.cluster_entry) { 1918 error = ffs_copyonwrite(vp, tbp); 1919 if (error != 0 && 1920 error != EOPNOTSUPP) { 1921 bp->b_error = error; 1922 bp->b_ioflags |= BIO_ERROR; 1923 bufdone(bp); 1924 return; 1925 } 1926 } 1927 bp->b_runningbufspace = bp->b_bufsize; 1928 atomic_add_long(&runningbufspace, 1929 bp->b_runningbufspace); 1930 } else { 1931 error = ffs_copyonwrite(vp, bp); 1932 if (error != 0 && error != EOPNOTSUPP) { 1933 bp->b_error = error; 1934 bp->b_ioflags |= BIO_ERROR; 1935 bufdone(bp); 1936 return; 1937 } 1938 } 1939 } 1940 #ifdef SOFTUPDATES 1941 if ((bp->b_flags & B_CLUSTER) != 0) { 1942 TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head, 1943 b_cluster.cluster_entry) { 1944 if (!LIST_EMPTY(&tbp->b_dep)) 1945 buf_start(tbp); 1946 } 1947 } else { 1948 if (!LIST_EMPTY(&bp->b_dep)) 1949 buf_start(bp); 1950 } 1951 1952 #endif 1953 } 1954 g_vfs_strategy(bo, bp); 1955 } 1956 1957 #ifdef DDB 1958 1959 static void 1960 db_print_ffs(struct ufsmount *ump) 1961 { 1962 db_printf("mp %p %s devvp %p fs %p su_wl %d su_wl_in %d su_deps %d " 1963 "su_req %d\n", 1964 ump->um_mountp, ump->um_mountp->mnt_stat.f_mntonname, 1965 ump->um_devvp, ump->um_fs, ump->softdep_on_worklist, 1966 ump->softdep_on_worklist_inprogress, ump->softdep_deps, 1967 ump->softdep_req); 1968 } 1969 1970 DB_SHOW_COMMAND(ffs, db_show_ffs) 1971 { 1972 struct mount *mp; 1973 struct ufsmount *ump; 1974 1975 if (have_addr) { 1976 ump = VFSTOUFS((struct mount *)addr); 1977 db_print_ffs(ump); 1978 return; 1979 } 1980 1981 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1982 if (!strcmp(mp->mnt_stat.f_fstypename, ufs_vfsconf.vfc_name)) 1983 db_print_ffs(VFSTOUFS(mp)); 1984 } 1985 } 1986 1987 #endif /* DDB */
Cache object: ca5027a1021030282b7c07fcb77f7ca4
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