| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * from: @(#)ufs_inode.c 7.40 (Berkeley) 5/8/91 |
| 34 | * $Id: ufs_inode.c,v 1.4 1993/11/07 17:53:44 wollman Exp $ |
| 35 | */ |
| 36 | |
| 37 | #include "param.h" |
| 38 | #include "systm.h" |
| 39 | #include "mount.h" |
| 40 | #include "proc.h" |
| 41 | #include "file.h" |
| 42 | #include "buf.h" |
| 43 | #include "vnode.h" |
| 44 | #include "kernel.h" |
| 45 | #include "malloc.h" |
| 46 | |
| 47 | #include "quota.h" |
| 48 | #include "inode.h" |
| 49 | #include "fs.h" |
| 50 | #include "ufsmount.h" |
| 51 | |
| 52 | #define INOHSZ 512 |
| 53 | #if ((INOHSZ&(INOHSZ-1)) == 0) |
| 54 | #define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1)) |
| 55 | #else |
| 56 | #define INOHASH(dev,ino) (((unsigned)((dev)+(ino)))%INOHSZ) |
| 57 | #endif |
| 58 | |
| 59 | u_long nextgennumber; /* next generation number to assign */ |
| 60 | |
| 61 | union ihead { |
| 62 | union ihead *ih_head[2]; |
| 63 | struct inode *ih_chain[2]; |
| 64 | } ihead[INOHSZ]; |
| 65 | |
| 66 | int prtactive; /* 1 => print out reclaim of active vnodes */ |
| 67 | |
| 68 | /* |
| 69 | * Initialize hash links for inodes. |
| 70 | */ |
| 71 | ufs_init() |
| 72 | { |
| 73 | register int i; |
| 74 | register union ihead *ih = ihead; |
| 75 | |
| 76 | #ifndef lint |
| 77 | if (VN_MAXPRIVATE < sizeof(struct inode)) |
| 78 | panic("ihinit: too small"); |
| 79 | #endif /* not lint */ |
| 80 | for (i = INOHSZ; --i >= 0; ih++) { |
| 81 | ih->ih_head[0] = ih; |
| 82 | ih->ih_head[1] = ih; |
| 83 | } |
| 84 | #ifdef QUOTA |
| 85 | dqinit(); |
| 86 | #endif /* QUOTA */ |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Look up a UFS dinode number to find its incore vnode. |
| 91 | * If it is not in core, read it in from the specified device. |
| 92 | * If it is in core, wait for the lock bit to clear, then |
| 93 | * return the inode locked. Detection and handling of mount |
| 94 | * points must be done by the calling routine. |
| 95 | */ |
| 96 | iget(xp, ino, ipp) |
| 97 | struct inode *xp; |
| 98 | ino_t ino; |
| 99 | struct inode **ipp; |
| 100 | { |
| 101 | dev_t dev = xp->i_dev; |
| 102 | struct mount *mntp = ITOV(xp)->v_mount; |
| 103 | register struct fs *fs = VFSTOUFS(mntp)->um_fs; |
| 104 | extern struct vnodeops ufs_vnodeops, spec_inodeops; |
| 105 | register struct inode *ip, *iq; |
| 106 | register struct vnode *vp; |
| 107 | struct vnode *nvp; |
| 108 | struct buf *bp; |
| 109 | struct dinode *dp; |
| 110 | union ihead *ih; |
| 111 | int i, error; |
| 112 | |
| 113 | ih = &ihead[INOHASH(dev, ino)]; |
| 114 | loop: |
| 115 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) { |
| 116 | if (ino != ip->i_number || dev != ip->i_dev) |
| 117 | continue; |
| 118 | if ((ip->i_flag&ILOCKED) != 0) { |
| 119 | ip->i_flag |= IWANT; |
| 120 | tsleep((caddr_t)ip, PINOD, "iget", 0); |
| 121 | goto loop; |
| 122 | } |
| 123 | if (vget(ITOV(ip))) |
| 124 | goto loop; |
| 125 | *ipp = ip; |
| 126 | return(0); |
| 127 | } |
| 128 | /* |
| 129 | * Allocate a new inode. |
| 130 | */ |
| 131 | if (error = getnewvnode(VT_UFS, mntp, &ufs_vnodeops, &nvp)) { |
| 132 | *ipp = 0; |
| 133 | return (error); |
| 134 | } |
| 135 | ip = VTOI(nvp); |
| 136 | ip->i_vnode = nvp; |
| 137 | ip->i_flag = 0; |
| 138 | ip->i_devvp = 0; |
| 139 | ip->i_mode = 0; |
| 140 | ip->i_diroff = 0; |
| 141 | ip->i_lockf = 0; |
| 142 | #ifdef QUOTA |
| 143 | for (i = 0; i < MAXQUOTAS; i++) |
| 144 | ip->i_dquot[i] = NODQUOT; |
| 145 | #endif |
| 146 | for (i=0; i < DI_SPARE_SZ; i++) |
| 147 | ip->i_di_spare[i] = (unsigned long)0L; |
| 148 | /* |
| 149 | * Put it onto its hash chain and lock it so that other requests for |
| 150 | * this inode will block if they arrive while we are sleeping waiting |
| 151 | * for old data structures to be purged or for the contents of the |
| 152 | * disk portion of this inode to be read. |
| 153 | */ |
| 154 | ip->i_dev = dev; |
| 155 | ip->i_number = ino; |
| 156 | insque(ip, ih); |
| 157 | ILOCK(ip); |
| 158 | /* |
| 159 | * Read in the disk contents for the inode. |
| 160 | */ |
| 161 | if (error = bread(VFSTOUFS(mntp)->um_devvp, fsbtodb(fs, itod(fs, ino)), |
| 162 | (int)fs->fs_bsize, NOCRED, &bp)) { |
| 163 | /* |
| 164 | * The inode does not contain anything useful, so it would |
| 165 | * be misleading to leave it on its hash chain. |
| 166 | * Iput() will take care of putting it back on the free list. |
| 167 | */ |
| 168 | remque(ip); |
| 169 | ip->i_forw = ip; |
| 170 | ip->i_back = ip; |
| 171 | /* |
| 172 | * Unlock and discard unneeded inode. |
| 173 | */ |
| 174 | iput(ip); |
| 175 | brelse(bp); |
| 176 | *ipp = 0; |
| 177 | return (error); |
| 178 | } |
| 179 | dp = bp->b_un.b_dino; |
| 180 | dp += itoo(fs, ino); |
| 181 | ip->i_din = *dp; |
| 182 | brelse(bp); |
| 183 | /* |
| 184 | * Initialize the associated vnode |
| 185 | */ |
| 186 | vp = ITOV(ip); |
| 187 | vp->v_type = IFTOVT(ip->i_mode); |
| 188 | if (vp->v_type == VFIFO) { |
| 189 | #ifdef FIFO |
| 190 | extern struct vnodeops fifo_inodeops; |
| 191 | vp->v_op = &fifo_inodeops; |
| 192 | #else |
| 193 | iput(ip); |
| 194 | *ipp = 0; |
| 195 | return (EOPNOTSUPP); |
| 196 | #endif /* FIFO */ |
| 197 | } |
| 198 | if (vp->v_type == VCHR || vp->v_type == VBLK) { |
| 199 | vp->v_op = &spec_inodeops; |
| 200 | if (nvp = checkalias(vp, ip->i_rdev, mntp)) { |
| 201 | /* |
| 202 | * Reinitialize aliased inode. |
| 203 | */ |
| 204 | vp = nvp; |
| 205 | iq = VTOI(vp); |
| 206 | iq->i_vnode = vp; |
| 207 | iq->i_flag = 0; |
| 208 | ILOCK(iq); |
| 209 | iq->i_din = ip->i_din; |
| 210 | iq->i_dev = dev; |
| 211 | iq->i_number = ino; |
| 212 | insque(iq, ih); |
| 213 | /* |
| 214 | * Discard unneeded vnode |
| 215 | */ |
| 216 | ip->i_mode = 0; |
| 217 | iput(ip); |
| 218 | ip = iq; |
| 219 | } |
| 220 | } |
| 221 | if (ino == ROOTINO) |
| 222 | vp->v_flag |= VROOT; |
| 223 | /* |
| 224 | * Finish inode initialization. |
| 225 | */ |
| 226 | ip->i_fs = fs; |
| 227 | ip->i_devvp = VFSTOUFS(mntp)->um_devvp; |
| 228 | VREF(ip->i_devvp); |
| 229 | /* |
| 230 | * Set up a generation number for this inode if it does not |
| 231 | * already have one. This should only happen on old filesystems. |
| 232 | */ |
| 233 | if (ip->i_gen == 0) { |
| 234 | if (++nextgennumber < (u_long)time.tv_sec) |
| 235 | nextgennumber = time.tv_sec; |
| 236 | ip->i_gen = nextgennumber; |
| 237 | if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) |
| 238 | ip->i_flag |= IMOD; |
| 239 | } |
| 240 | *ipp = ip; |
| 241 | return (0); |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Unlock and decrement the reference count of an inode structure. |
| 246 | */ |
| 247 | iput(ip) |
| 248 | register struct inode *ip; |
| 249 | { |
| 250 | |
| 251 | if ((ip->i_flag & ILOCKED) == 0) |
| 252 | panic("iput"); |
| 253 | IUNLOCK(ip); |
| 254 | vrele(ITOV(ip)); |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * Last reference to an inode, write the inode out and if necessary, |
| 259 | * truncate and deallocate the file. |
| 260 | */ |
| 261 | ufs_inactive(vp, p) |
| 262 | struct vnode *vp; |
| 263 | struct proc *p; |
| 264 | { |
| 265 | register struct inode *ip = VTOI(vp); |
| 266 | int mode, error = 0; |
| 267 | |
| 268 | if (prtactive && vp->v_usecount != 0) |
| 269 | vprint("ufs_inactive: pushing active", vp); |
| 270 | /* |
| 271 | * Get rid of inodes related to stale file handles. |
| 272 | */ |
| 273 | if (ip->i_mode == 0) { |
| 274 | if ((vp->v_flag & VXLOCK) == 0) |
| 275 | vgone(vp); |
| 276 | return (0); |
| 277 | } |
| 278 | ILOCK(ip); |
| 279 | if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { |
| 280 | #ifdef QUOTA |
| 281 | if (!getinoquota(ip)) |
| 282 | (void) chkiq(ip, -1, NOCRED, 0); |
| 283 | #endif |
| 284 | error = itrunc(ip, (u_long)0, 0); |
| 285 | mode = ip->i_mode; |
| 286 | ip->i_mode = 0; |
| 287 | ip->i_rdev = 0; |
| 288 | ip->i_flag |= IUPD|ICHG; |
| 289 | ifree(ip, ip->i_number, mode); |
| 290 | } |
| 291 | IUPDAT(ip, &time, &time, 0); |
| 292 | IUNLOCK(ip); |
| 293 | ip->i_flag = 0; |
| 294 | /* |
| 295 | * If we are done with the inode, reclaim it |
| 296 | * so that it can be reused immediately. |
| 297 | */ |
| 298 | if (vp->v_usecount == 0 && ip->i_mode == 0) |
| 299 | vgone(vp); |
| 300 | return (error); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Reclaim an inode so that it can be used for other purposes. |
| 305 | */ |
| 306 | ufs_reclaim(vp) |
| 307 | register struct vnode *vp; |
| 308 | { |
| 309 | register struct inode *ip = VTOI(vp); |
| 310 | int i; |
| 311 | |
| 312 | if (prtactive && vp->v_usecount != 0) |
| 313 | vprint("ufs_reclaim: pushing active", vp); |
| 314 | /* |
| 315 | * Remove the inode from its hash chain. |
| 316 | */ |
| 317 | remque(ip); |
| 318 | ip->i_forw = ip; |
| 319 | ip->i_back = ip; |
| 320 | /* |
| 321 | * Purge old data structures associated with the inode. |
| 322 | */ |
| 323 | cache_purge(vp); |
| 324 | if (ip->i_devvp) { |
| 325 | vrele(ip->i_devvp); |
| 326 | ip->i_devvp = 0; |
| 327 | } |
| 328 | #ifdef QUOTA |
| 329 | for (i = 0; i < MAXQUOTAS; i++) { |
| 330 | if (ip->i_dquot[i] != NODQUOT) { |
| 331 | dqrele(vp, ip->i_dquot[i]); |
| 332 | ip->i_dquot[i] = NODQUOT; |
| 333 | } |
| 334 | } |
| 335 | #endif |
| 336 | ip->i_flag = 0; |
| 337 | return (0); |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Update the access, modified, and inode change times as specified |
| 342 | * by the IACC, IMOD, and ICHG flags respectively. The IUPD flag |
| 343 | * is used to specify that the inode needs to be updated but that |
| 344 | * the times have already been set. The access and modified times |
| 345 | * are taken from the second and third parameters; the inode change |
| 346 | * time is always taken from the current time. If waitfor is set, |
| 347 | * then wait for the disk write of the inode to complete. |
| 348 | */ |
| 349 | iupdat(ip, ta, tm, waitfor) |
| 350 | register struct inode *ip; |
| 351 | struct timeval *ta, *tm; |
| 352 | int waitfor; |
| 353 | { |
| 354 | struct buf *bp; |
| 355 | struct vnode *vp = ITOV(ip); |
| 356 | struct dinode *dp; |
| 357 | register struct fs *fs; |
| 358 | int error; |
| 359 | |
| 360 | fs = ip->i_fs; |
| 361 | if ((ip->i_flag & (IUPD|IACC|ICHG|IMOD)) == 0) |
| 362 | return (0); |
| 363 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 364 | return (0); |
| 365 | error = bread(ip->i_devvp, fsbtodb(fs, itod(fs, ip->i_number)), |
| 366 | (int)fs->fs_bsize, NOCRED, &bp); |
| 367 | if (error) { |
| 368 | brelse(bp); |
| 369 | return (error); |
| 370 | } |
| 371 | if (ip->i_flag&IACC) |
| 372 | ip->i_atime = ta->tv_sec; |
| 373 | if (ip->i_flag&IUPD) |
| 374 | ip->i_mtime = tm->tv_sec; |
| 375 | if (ip->i_flag&ICHG) |
| 376 | ip->i_ctime = time.tv_sec; |
| 377 | ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD); |
| 378 | dp = bp->b_un.b_dino + itoo(fs, ip->i_number); |
| 379 | *dp = ip->i_din; |
| 380 | if (waitfor) { |
| 381 | return (bwrite(bp)); |
| 382 | } else { |
| 383 | bdwrite(bp); |
| 384 | return (0); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | #define SINGLE 0 /* index of single indirect block */ |
| 389 | #define DOUBLE 1 /* index of double indirect block */ |
| 390 | #define TRIPLE 2 /* index of triple indirect block */ |
| 391 | /* |
| 392 | * Truncate the inode ip to at most length size. Free affected disk |
| 393 | * blocks -- the blocks of the file are removed in reverse order. |
| 394 | * |
| 395 | * NB: triple indirect blocks are untested. |
| 396 | */ |
| 397 | itrunc(oip, length, flags) |
| 398 | register struct inode *oip; |
| 399 | u_long length; |
| 400 | int flags; |
| 401 | { |
| 402 | register daddr_t lastblock; |
| 403 | daddr_t bn, lbn, lastiblock[NIADDR]; |
| 404 | register struct fs *fs; |
| 405 | register struct inode *ip; |
| 406 | struct buf *bp; |
| 407 | int offset, osize, size, level; |
| 408 | long count, nblocks, blocksreleased = 0; |
| 409 | register int i; |
| 410 | int aflags, error, allerror; |
| 411 | struct inode tip; |
| 412 | |
| 413 | vnode_pager_setsize(ITOV(oip), length); |
| 414 | if (FASTLINK(oip)) { |
| 415 | if (length != 0) |
| 416 | panic("itrunc fastlink to non-zero"); |
| 417 | bzero(oip->i_symlink, MAXFASTLINK); |
| 418 | oip->i_size = 0; |
| 419 | oip->i_din.di_spare[0] = 0; |
| 420 | } |
| 421 | if (oip->i_size <= length) { |
| 422 | oip->i_flag |= ICHG|IUPD; |
| 423 | error = iupdat(oip, &time, &time, 1); |
| 424 | return (error); |
| 425 | } |
| 426 | /* |
| 427 | * Calculate index into inode's block list of |
| 428 | * last direct and indirect blocks (if any) |
| 429 | * which we want to keep. Lastblock is -1 when |
| 430 | * the file is truncated to 0. |
| 431 | */ |
| 432 | fs = oip->i_fs; |
| 433 | lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1; |
| 434 | lastiblock[SINGLE] = lastblock - NDADDR; |
| 435 | lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); |
| 436 | lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); |
| 437 | nblocks = btodb(fs->fs_bsize); |
| 438 | /* |
| 439 | * Update the size of the file. If the file is not being |
| 440 | * truncated to a block boundry, the contents of the |
| 441 | * partial block following the end of the file must be |
| 442 | * zero'ed in case it ever become accessable again because |
| 443 | * of subsequent file growth. |
| 444 | */ |
| 445 | osize = oip->i_size; |
| 446 | offset = blkoff(fs, length); |
| 447 | if (offset == 0) { |
| 448 | oip->i_size = length; |
| 449 | } else { |
| 450 | lbn = lblkno(fs, length); |
| 451 | aflags = B_CLRBUF; |
| 452 | if (flags & IO_SYNC) |
| 453 | aflags |= B_SYNC; |
| 454 | #ifdef QUOTA |
| 455 | if (error = getinoquota(oip)) |
| 456 | return (error); |
| 457 | #endif |
| 458 | if (error = balloc(oip, lbn, offset, &bp, aflags)) |
| 459 | return (error); |
| 460 | oip->i_size = length; |
| 461 | size = blksize(fs, oip, lbn); |
| 462 | (void) vnode_pager_uncache(ITOV(oip)); |
| 463 | bzero(bp->b_un.b_addr + offset, (unsigned)(size - offset)); |
| 464 | allocbuf(bp, size); |
| 465 | if (flags & IO_SYNC) |
| 466 | bwrite(bp); |
| 467 | else |
| 468 | bdwrite(bp); |
| 469 | } |
| 470 | /* |
| 471 | * Update file and block pointers |
| 472 | * on disk before we start freeing blocks. |
| 473 | * If we crash before free'ing blocks below, |
| 474 | * the blocks will be returned to the free list. |
| 475 | * lastiblock values are also normalized to -1 |
| 476 | * for calls to indirtrunc below. |
| 477 | */ |
| 478 | tip = *oip; |
| 479 | tip.i_size = osize; |
| 480 | for (level = TRIPLE; level >= SINGLE; level--) |
| 481 | if (lastiblock[level] < 0) { |
| 482 | oip->i_ib[level] = 0; |
| 483 | lastiblock[level] = -1; |
| 484 | } |
| 485 | for (i = NDADDR - 1; i > lastblock; i--) |
| 486 | oip->i_db[i] = 0; |
| 487 | oip->i_flag |= ICHG|IUPD; |
| 488 | vinvalbuf(ITOV(oip), (length > 0)); |
| 489 | allerror = iupdat(oip, &time, &time, MNT_WAIT); |
| 490 | |
| 491 | /* |
| 492 | * Indirect blocks first. |
| 493 | */ |
| 494 | ip = &tip; |
| 495 | for (level = TRIPLE; level >= SINGLE; level--) { |
| 496 | bn = ip->i_ib[level]; |
| 497 | if (bn != 0) { |
| 498 | error = indirtrunc(ip, bn, lastiblock[level], level, |
| 499 | &count); |
| 500 | if (error) |
| 501 | allerror = error; |
| 502 | blocksreleased += count; |
| 503 | if (lastiblock[level] < 0) { |
| 504 | ip->i_ib[level] = 0; |
| 505 | blkfree(ip, bn, (off_t)fs->fs_bsize); |
| 506 | blocksreleased += nblocks; |
| 507 | } |
| 508 | } |
| 509 | if (lastiblock[level] >= 0) |
| 510 | goto done; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * All whole direct blocks or frags. |
| 515 | */ |
| 516 | for (i = NDADDR - 1; i > lastblock; i--) { |
| 517 | register off_t bsize; |
| 518 | |
| 519 | bn = ip->i_db[i]; |
| 520 | if (bn == 0) |
| 521 | continue; |
| 522 | ip->i_db[i] = 0; |
| 523 | bsize = (off_t)blksize(fs, ip, i); |
| 524 | blkfree(ip, bn, bsize); |
| 525 | blocksreleased += btodb(bsize); |
| 526 | } |
| 527 | if (lastblock < 0) |
| 528 | goto done; |
| 529 | |
| 530 | /* |
| 531 | * Finally, look for a change in size of the |
| 532 | * last direct block; release any frags. |
| 533 | */ |
| 534 | bn = ip->i_db[lastblock]; |
| 535 | if (bn != 0) { |
| 536 | off_t oldspace, newspace; |
| 537 | |
| 538 | /* |
| 539 | * Calculate amount of space we're giving |
| 540 | * back as old block size minus new block size. |
| 541 | */ |
| 542 | oldspace = blksize(fs, ip, lastblock); |
| 543 | ip->i_size = length; |
| 544 | newspace = blksize(fs, ip, lastblock); |
| 545 | if (newspace == 0) |
| 546 | panic("itrunc: newspace"); |
| 547 | if (oldspace - newspace > 0) { |
| 548 | /* |
| 549 | * Block number of space to be free'd is |
| 550 | * the old block # plus the number of frags |
| 551 | * required for the storage we're keeping. |
| 552 | */ |
| 553 | bn += numfrags(fs, newspace); |
| 554 | blkfree(ip, bn, oldspace - newspace); |
| 555 | blocksreleased += btodb(oldspace - newspace); |
| 556 | } |
| 557 | } |
| 558 | done: |
| 559 | /* BEGIN PARANOIA */ |
| 560 | for (level = SINGLE; level <= TRIPLE; level++) |
| 561 | if (ip->i_ib[level] != oip->i_ib[level]) |
| 562 | panic("itrunc1"); |
| 563 | for (i = 0; i < NDADDR; i++) |
| 564 | if (ip->i_db[i] != oip->i_db[i]) |
| 565 | panic("itrunc2"); |
| 566 | /* END PARANOIA */ |
| 567 | oip->i_blocks -= blocksreleased; |
| 568 | if (oip->i_blocks < 0) /* sanity */ |
| 569 | oip->i_blocks = 0; |
| 570 | oip->i_flag |= ICHG; |
| 571 | #ifdef QUOTA |
| 572 | if (!getinoquota(oip)) |
| 573 | (void) chkdq(oip, -blocksreleased, NOCRED, 0); |
| 574 | #endif |
| 575 | return (allerror); |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Release blocks associated with the inode ip and |
| 580 | * stored in the indirect block bn. Blocks are free'd |
| 581 | * in LIFO order up to (but not including) lastbn. If |
| 582 | * level is greater than SINGLE, the block is an indirect |
| 583 | * block and recursive calls to indirtrunc must be used to |
| 584 | * cleanse other indirect blocks. |
| 585 | * |
| 586 | * NB: triple indirect blocks are untested. |
| 587 | */ |
| 588 | indirtrunc(ip, bn, lastbn, level, countp) |
| 589 | register struct inode *ip; |
| 590 | daddr_t bn, lastbn; |
| 591 | int level; |
| 592 | long *countp; |
| 593 | { |
| 594 | register int i; |
| 595 | struct buf *bp; |
| 596 | register struct fs *fs = ip->i_fs; |
| 597 | register daddr_t *bap; |
| 598 | daddr_t *copy, nb, last; |
| 599 | long blkcount, factor; |
| 600 | int nblocks, blocksreleased = 0; |
| 601 | int error, allerror = 0; |
| 602 | |
| 603 | /* |
| 604 | * Calculate index in current block of last |
| 605 | * block to be kept. -1 indicates the entire |
| 606 | * block so we need not calculate the index. |
| 607 | */ |
| 608 | factor = 1; |
| 609 | for (i = SINGLE; i < level; i++) |
| 610 | factor *= NINDIR(fs); |
| 611 | last = lastbn; |
| 612 | if (lastbn > 0) |
| 613 | last /= factor; |
| 614 | nblocks = btodb(fs->fs_bsize); |
| 615 | /* |
| 616 | * Get buffer of block pointers, zero those |
| 617 | * entries corresponding to blocks to be free'd, |
| 618 | * and update on disk copy first. |
| 619 | */ |
| 620 | error = bread(ip->i_devvp, fsbtodb(fs, bn), (int)fs->fs_bsize, |
| 621 | NOCRED, &bp); |
| 622 | if (error) { |
| 623 | brelse(bp); |
| 624 | *countp = 0; |
| 625 | return (error); |
| 626 | } |
| 627 | bap = bp->b_un.b_daddr; |
| 628 | MALLOC(copy, daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK); |
| 629 | bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize); |
| 630 | bzero((caddr_t)&bap[last + 1], |
| 631 | (u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t)); |
| 632 | if (last == -1) |
| 633 | bp->b_flags |= B_INVAL; |
| 634 | error = bwrite(bp); |
| 635 | if (error) |
| 636 | allerror = error; |
| 637 | bap = copy; |
| 638 | |
| 639 | /* |
| 640 | * Recursively free totally unused blocks. |
| 641 | */ |
| 642 | for (i = NINDIR(fs) - 1; i > last; i--) { |
| 643 | nb = bap[i]; |
| 644 | if (nb == 0) |
| 645 | continue; |
| 646 | if (level > SINGLE) { |
| 647 | error = indirtrunc(ip, nb, (daddr_t)-1, level - 1, |
| 648 | &blkcount); |
| 649 | if (error) |
| 650 | allerror = error; |
| 651 | blocksreleased += blkcount; |
| 652 | } |
| 653 | blkfree(ip, nb, (off_t)fs->fs_bsize); |
| 654 | blocksreleased += nblocks; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Recursively free last partial block. |
| 659 | */ |
| 660 | if (level > SINGLE && lastbn >= 0) { |
| 661 | last = lastbn % factor; |
| 662 | nb = bap[i]; |
| 663 | if (nb != 0) { |
| 664 | error = indirtrunc(ip, nb, last, level - 1, &blkcount); |
| 665 | if (error) |
| 666 | allerror = error; |
| 667 | blocksreleased += blkcount; |
| 668 | } |
| 669 | } |
| 670 | FREE(copy, M_TEMP); |
| 671 | *countp = blocksreleased; |
| 672 | return (allerror); |
| 673 | } |
| 674 | |
| 675 | /* |
| 676 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
| 677 | */ |
| 678 | ilock(ip) |
| 679 | register struct inode *ip; |
| 680 | { |
| 681 | |
| 682 | while (ip->i_flag & ILOCKED) { |
| 683 | ip->i_flag |= IWANT; |
| 684 | if (ip->i_spare0 == curproc->p_pid) |
| 685 | panic("locking against myself"); |
| 686 | ip->i_spare1 = curproc->p_pid; |
| 687 | (void) tsleep((caddr_t)ip, PINOD, "ilock", 0); |
| 688 | } |
| 689 | ip->i_spare1 = 0; |
| 690 | ip->i_spare0 = curproc->p_pid; |
| 691 | ip->i_flag |= ILOCKED; |
| 692 | } |
| 693 | |
| 694 | /* |
| 695 | * Unlock an inode. If WANT bit is on, wakeup. |
| 696 | */ |
| 697 | iunlock(ip) |
| 698 | register struct inode *ip; |
| 699 | { |
| 700 | |
| 701 | if ((ip->i_flag & ILOCKED) == 0) |
| 702 | vprint("iunlock: unlocked inode", ITOV(ip)); |
| 703 | ip->i_spare0 = 0; |
| 704 | ip->i_flag &= ~ILOCKED; |
| 705 | if (ip->i_flag&IWANT) { |
| 706 | ip->i_flag &= ~IWANT; |
| 707 | wakeup((caddr_t)ip); |
| 708 | } |
| 709 | } |