lfs_inode.c revision 1.6
1 /* $NetBSD: lfs_inode.c,v 1.6 1996/09/01 23:49:27 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1986, 1989, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)lfs_inode.c 8.5 (Berkeley) 12/30/93 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/mount.h> 41 #include <sys/proc.h> 42 #include <sys/file.h> 43 #include <sys/buf.h> 44 #include <sys/vnode.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 48 #include <vm/vm.h> 49 50 #include <ufs/ufs/quota.h> 51 #include <ufs/ufs/inode.h> 52 #include <ufs/ufs/ufsmount.h> 53 #include <ufs/ufs/ufs_extern.h> 54 55 #include <ufs/lfs/lfs.h> 56 #include <ufs/lfs/lfs_extern.h> 57 58 void 59 lfs_init() 60 { 61 ufs_init(); 62 } 63 64 /* Search a block for a specific dinode. */ 65 struct dinode * 66 lfs_ifind(fs, ino, dip) 67 struct lfs *fs; 68 ino_t ino; 69 register struct dinode *dip; 70 { 71 register int cnt; 72 register struct dinode *ldip; 73 74 for (cnt = INOPB(fs), ldip = dip + (cnt - 1); cnt--; --ldip) 75 if (ldip->di_inumber == ino) 76 return (ldip); 77 78 panic("lfs_ifind: dinode %u not found", ino); 79 /* NOTREACHED */ 80 } 81 82 int 83 lfs_update(v) 84 void *v; 85 { 86 struct vop_update_args /* { 87 struct vnode *a_vp; 88 struct timespec *a_access; 89 struct timespec *a_modify; 90 int a_waitfor; 91 } */ *ap = v; 92 struct inode *ip; 93 int mod; 94 struct timespec ts; 95 96 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 97 return (0); 98 ip = VTOI(ap->a_vp); 99 mod = ip->i_flag & IN_MODIFIED; 100 TIMEVAL_TO_TIMESPEC(&time, &ts); 101 ITIMES(ip, ap->a_access, ap->a_modify, &ts); 102 if (!mod && ip->i_flag & IN_MODIFIED) 103 ip->i_lfs->lfs_uinodes++; 104 if ((ip->i_flag & IN_MODIFIED) == 0) 105 return (0); 106 107 /* If sync, push back the vnode and any dirty blocks it may have. */ 108 return (ap->a_waitfor & LFS_SYNC ? lfs_vflush(ap->a_vp) : 0); 109 } 110 111 /* Update segment usage information when removing a block. */ 112 #define UPDATE_SEGUSE \ 113 if (lastseg != -1) { \ 114 LFS_SEGENTRY(sup, fs, lastseg, sup_bp); \ 115 if ((num << fs->lfs_bshift) > sup->su_nbytes) \ 116 panic("lfs_truncate: negative bytes in segment %d\n", \ 117 lastseg); \ 118 sup->su_nbytes -= num << fs->lfs_bshift; \ 119 e1 = VOP_BWRITE(sup_bp); \ 120 blocksreleased += num; \ 121 } 122 123 #define SEGDEC { \ 124 if (daddr != 0) { \ 125 if (lastseg != (seg = datosn(fs, daddr))) { \ 126 UPDATE_SEGUSE; \ 127 num = 1; \ 128 lastseg = seg; \ 129 } else \ 130 ++num; \ 131 } \ 132 } 133 134 /* 135 * Truncate the inode ip to at most length size. Update segment usage 136 * table information. 137 */ 138 /* ARGSUSED */ 139 int 140 lfs_truncate(v) 141 void *v; 142 { 143 struct vop_truncate_args /* { 144 struct vnode *a_vp; 145 off_t a_length; 146 int a_flags; 147 struct ucred *a_cred; 148 struct proc *a_p; 149 } */ *ap = v; 150 register struct indir *inp; 151 register int i; 152 register daddr_t *daddrp; 153 register struct vnode *vp = ap->a_vp; 154 off_t length = ap->a_length; 155 struct buf *bp, *sup_bp; 156 struct timespec ts; 157 struct ifile *ifp; 158 struct inode *ip; 159 struct lfs *fs; 160 struct indir a[NIADDR + 2], a_end[NIADDR + 2]; 161 SEGUSE *sup; 162 daddr_t daddr, lastblock, lbn, olastblock; 163 long off, a_released, blocksreleased, i_released; 164 int e1, e2, depth, lastseg, num, offset, seg, size; 165 166 ip = VTOI(vp); 167 TIMEVAL_TO_TIMESPEC(&time, &ts); 168 if (vp->v_type == VLNK && vp->v_mount->mnt_maxsymlinklen > 0) { 169 #ifdef DIAGNOSTIC 170 if (length != 0) 171 panic("lfs_truncate: partial truncate of symlink"); 172 #endif 173 bzero((char *)&ip->i_shortlink, (u_int)ip->i_size); 174 ip->i_size = 0; 175 ip->i_flag |= IN_CHANGE | IN_UPDATE; 176 return (VOP_UPDATE(vp, &ts, &ts, 0)); 177 } 178 vnode_pager_setsize(vp, (u_long)length); 179 180 fs = ip->i_lfs; 181 182 /* If length is larger than the file, just update the times. */ 183 if (ip->i_size <= length) { 184 ip->i_flag |= IN_CHANGE | IN_UPDATE; 185 return (VOP_UPDATE(vp, &ts, &ts, 0)); 186 } 187 188 /* 189 * Calculate index into inode's block list of last direct and indirect 190 * blocks (if any) which we want to keep. Lastblock is 0 when the 191 * file is truncated to 0. 192 */ 193 lastblock = lblkno(fs, length + fs->lfs_bsize - 1); 194 olastblock = lblkno(fs, ip->i_size + fs->lfs_bsize - 1) - 1; 195 196 /* 197 * Update the size of the file. If the file is not being truncated to 198 * a block boundry, the contents of the partial block following the end 199 * of the file must be zero'ed in case it ever become accessable again 200 * because of subsequent file growth. 201 */ 202 offset = blkoff(fs, length); 203 if (offset == 0) 204 ip->i_size = length; 205 else { 206 lbn = lblkno(fs, length); 207 #ifdef QUOTA 208 if ((e1 = getinoquota(ip)) != 0) 209 return (e1); 210 #endif 211 if ((e1 = bread(vp, lbn, fs->lfs_bsize, NOCRED, &bp)) != 0) 212 return (e1); 213 ip->i_size = length; 214 size = blksize(fs); 215 (void)vnode_pager_uncache(vp); 216 bzero((char *)bp->b_data + offset, (u_int)(size - offset)); 217 allocbuf(bp, size); 218 if ((e1 = VOP_BWRITE(bp)) != 0) 219 return (e1); 220 } 221 /* 222 * Modify sup->su_nbyte counters for each deleted block; keep track 223 * of number of blocks removed for ip->i_blocks. 224 */ 225 blocksreleased = 0; 226 num = 0; 227 lastseg = -1; 228 229 for (lbn = olastblock; lbn >= lastblock;) { 230 /* XXX use run length from bmap array to make this faster */ 231 ufs_bmaparray(vp, lbn, &daddr, a, &depth, NULL); 232 if (lbn == olastblock) 233 for (i = NIADDR + 2; i--;) 234 a_end[i] = a[i]; 235 switch (depth) { 236 case 0: /* Direct block. */ 237 daddr = ip->i_db[lbn]; 238 SEGDEC; 239 ip->i_db[lbn] = 0; 240 --lbn; 241 break; 242 #ifdef DIAGNOSTIC 243 case 1: /* An indirect block. */ 244 panic("lfs_truncate: ufs_bmaparray returned depth 1"); 245 /* NOTREACHED */ 246 #endif 247 default: /* Chain of indirect blocks. */ 248 inp = a + --depth; 249 if (inp->in_off > 0 && lbn != lastblock) { 250 lbn -= inp->in_off < lbn - lastblock ? 251 inp->in_off : lbn - lastblock; 252 break; 253 } 254 for (; depth && (inp->in_off == 0 || lbn == lastblock); 255 --inp, --depth) { 256 if (bread(vp, 257 inp->in_lbn, fs->lfs_bsize, NOCRED, &bp)) 258 panic("lfs_truncate: bread bno %d", 259 inp->in_lbn); 260 daddrp = (daddr_t *)bp->b_data + inp->in_off; 261 for (i = inp->in_off; 262 i++ <= a_end[depth].in_off;) { 263 daddr = *daddrp++; 264 SEGDEC; 265 } 266 a_end[depth].in_off = NINDIR(fs) - 1; 267 if (inp->in_off == 0) 268 brelse (bp); 269 else { 270 bzero((daddr_t *)bp->b_data + 271 inp->in_off, fs->lfs_bsize - 272 inp->in_off * sizeof(daddr_t)); 273 if ((e1 = VOP_BWRITE(bp)) != 0) 274 return (e1); 275 } 276 } 277 if (depth == 0 && a[1].in_off == 0) { 278 off = a[0].in_off; 279 daddr = ip->i_ib[off]; 280 SEGDEC; 281 ip->i_ib[off] = 0; 282 } 283 if (lbn == lastblock || lbn <= NDADDR) 284 --lbn; 285 else { 286 lbn -= NINDIR(fs); 287 if (lbn < lastblock) 288 lbn = lastblock; 289 } 290 } 291 } 292 UPDATE_SEGUSE; 293 294 /* If truncating the file to 0, update the version number. */ 295 if (length == 0) { 296 LFS_IENTRY(ifp, fs, ip->i_number, bp); 297 ++ifp->if_version; 298 (void) VOP_BWRITE(bp); 299 } 300 301 #ifdef DIAGNOSTIC 302 if (ip->i_blocks < fsbtodb(fs, blocksreleased)) { 303 printf("lfs_truncate: block count < 0\n"); 304 blocksreleased = ip->i_blocks; 305 } 306 #endif 307 ip->i_blocks -= fsbtodb(fs, blocksreleased); 308 fs->lfs_bfree += fsbtodb(fs, blocksreleased); 309 ip->i_flag |= IN_CHANGE | IN_UPDATE; 310 /* 311 * Traverse dirty block list counting number of dirty buffers 312 * that are being deleted out of the cache, so that the lfs_avail 313 * field can be updated. 314 */ 315 a_released = 0; 316 i_released = 0; 317 for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = bp->b_vnbufs.le_next) 318 if (bp->b_flags & B_LOCKED) { 319 ++a_released; 320 /* 321 * XXX 322 * When buffers are created in the cache, their block 323 * number is set equal to their logical block number. 324 * If that is still true, we are assuming that the 325 * blocks are new (not yet on disk) and weren't 326 * counted above. However, there is a slight chance 327 * that a block's disk address is equal to its logical 328 * block number in which case, we'll get an overcounting 329 * here. 330 */ 331 if (bp->b_blkno == bp->b_lblkno) 332 ++i_released; 333 } 334 blocksreleased = fsbtodb(fs, i_released); 335 #ifdef DIAGNOSTIC 336 if (blocksreleased > ip->i_blocks) { 337 printf("lfs_inode: Warning! %s\n", 338 "more blocks released from inode than are in inode"); 339 blocksreleased = ip->i_blocks; 340 } 341 #endif 342 fs->lfs_bfree += blocksreleased; 343 ip->i_blocks -= blocksreleased; 344 #ifdef DIAGNOSTIC 345 if (length == 0 && ip->i_blocks != 0) 346 printf("lfs_inode: Warning! %s%d%s\n", 347 "Truncation to zero, but ", ip->i_blocks, 348 " blocks left on inode"); 349 #endif 350 fs->lfs_avail += fsbtodb(fs, a_released); 351 e1 = vinvalbuf(vp, (length > 0) ? V_SAVE : 0, ap->a_cred, ap->a_p, 352 0, 0); 353 e2 = VOP_UPDATE(vp, &ts, &ts, 0); 354 return (e1 ? e1 : e2 ? e2 : 0); 355 } 356
Indexes created Fri Sep 26 20:09:58 GMT 2025