1 /* 2 * Copyright (c) 1986, 1989, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)lfs_inode.c 7.68 (Berkeley) 06/20/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/mount.h> 13 #include <sys/proc.h> 14 #include <sys/file.h> 15 #include <sys/buf.h> 16 #include <sys/vnode.h> 17 #include <sys/kernel.h> 18 #include <sys/malloc.h> 19 20 #include <vm/vm.h> 21 22 #include <ufs/ufs/quota.h> 23 #include <ufs/ufs/inode.h> 24 #include <ufs/ufs/ufsmount.h> 25 #include <ufs/ufs/ufs_extern.h> 26 27 #include <ufs/lfs/lfs.h> 28 #include <ufs/lfs/lfs_extern.h> 29 30 static struct dinode *lfs_ifind __P((struct lfs *, ino_t, struct dinode *)); 31 32 int 33 lfs_init() 34 { 35 #ifdef VERBOSE 36 printf("lfs_init\n"); 37 #endif 38 return (ufs_init()); 39 } 40 41 /* 42 * Look up an LFS dinode number to find its incore vnode. If not already 43 * in core, read it in from the specified device. Return the inode locked. 44 * Detection and handling of mount points must be done by the calling routine. 45 */ 46 int 47 lfs_vget (ap) 48 struct vop_vget_args *ap; 49 { 50 register struct lfs *fs; 51 register struct inode *ip; 52 struct buf *bp; 53 struct ifile *ifp; 54 struct vnode *vp; 55 struct ufsmount *ump; 56 daddr_t daddr; 57 dev_t dev; 58 int error; 59 60 #ifdef VERBOSE 61 printf("lfs_vget\n"); 62 #endif 63 ump = VFSTOUFS(ap->a_mp); 64 dev = ump->um_dev; 65 if ((*ap->a_vpp = ufs_ihashget(dev, ap->a_ino)) != NULL) 66 return (0); 67 68 /* Translate the inode number to a disk address. */ 69 fs = ump->um_lfs; 70 if (ap->a_ino == LFS_IFILE_INUM) 71 daddr = fs->lfs_idaddr; 72 else { 73 LFS_IENTRY(ifp, fs, ap->a_ino, bp); 74 daddr = ifp->if_daddr; 75 brelse(bp); 76 if (daddr == LFS_UNUSED_DADDR) 77 return (ENOENT); 78 } 79 80 /* Allocate new vnode/inode. */ 81 if (error = lfs_vcreate(ap->a_mp, ap->a_ino, &vp)) { 82 *ap->a_vpp = NULL; 83 return (error); 84 } 85 86 /* 87 * Put it onto its hash chain and lock it so that other requests for 88 * this inode will block if they arrive while we are sleeping waiting 89 * for old data structures to be purged or for the contents of the 90 * disk portion of this inode to be read. 91 */ 92 ip = VTOI(vp); 93 ufs_ihashins(ip); 94 95 /* 96 * XXX 97 * This may not need to be here, logically it should go down with 98 * the i_devvp initialization. 99 * Ask Kirk. 100 */ 101 ip->i_lfs = ump->um_lfs; 102 103 /* Read in the disk contents for the inode, copy into the inode. */ 104 if (error = 105 bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) { 106 /* 107 * The inode does not contain anything useful, so it 108 * would be misleading to leave it on its hash chain. 109 * Iput() will return it to the free list. 110 */ 111 remque(ip); 112 ip->i_forw = ip; 113 ip->i_back = ip; 114 115 /* Unlock and discard unneeded inode. */ 116 ufs_iput(ip); 117 brelse(bp); 118 *ap->a_vpp = NULL; 119 return (error); 120 } 121 ip->i_din = *lfs_ifind(fs, ap->a_ino, bp->b_un.b_dino); 122 brelse(bp); 123 124 /* 125 * Initialize the vnode from the inode, check for aliases. In all 126 * cases re-init ip, the underlying vnode/inode may have changed. 127 */ 128 if (error = ufs_vinit(ap->a_mp, lfs_specop_p, LFS_FIFOOPS, &vp)) { 129 ufs_iput(ip); 130 *ap->a_vpp = NULL; 131 return (error); 132 } 133 /* 134 * Finish inode initialization now that aliasing has been resolved. 135 */ 136 ip->i_devvp = ump->um_devvp; 137 VREF(ip->i_devvp); 138 *ap->a_vpp = vp; 139 return (0); 140 } 141 142 /* Search a block for a specific dinode. */ 143 static struct dinode * 144 lfs_ifind(fs, ino, dip) 145 struct lfs *fs; 146 ino_t ino; 147 register struct dinode *dip; 148 { 149 register int cnt; 150 151 #ifdef VERBOSE 152 printf("lfs_ifind: inode %d\n", ino); 153 #endif 154 for (cnt = INOPB(fs); cnt--; ++dip) 155 if (dip->di_inum == ino) 156 return (dip); 157 158 panic("lfs_ifind: dinode %u not found", ino); 159 /* NOTREACHED */ 160 } 161 162 int 163 lfs_update (ap) 164 struct vop_update_args *ap; 165 { 166 struct vnode *vp = ap->a_vp; 167 struct inode *ip; 168 169 #ifdef VERBOSE 170 printf("lfs_update\n"); 171 #endif 172 if (vp->v_mount->mnt_flag & MNT_RDONLY) 173 return (0); 174 ip = VTOI(vp); 175 if ((ip->i_flag & (IUPD|IACC|ICHG|IMOD)) == 0) 176 return (0); 177 if (ip->i_flag&IACC) 178 ip->i_atime.ts_sec = ap->a_ta->tv_sec; 179 if (ip->i_flag&IUPD) { 180 ip->i_mtime.ts_sec = ap->a_tm->tv_sec; 181 (ip)->i_modrev++; 182 } 183 if (ip->i_flag&ICHG) 184 ip->i_ctime.ts_sec = time.tv_sec; 185 ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD); 186 187 /* Push back the vnode and any dirty blocks it may have. */ 188 return (ap->a_waitfor ? lfs_vflush(vp) : 0); 189 } 190 191 /* Update segment usage information when removing a block. */ 192 #define UPDATE_SEGUSE \ 193 if (lastseg != -1) { \ 194 LFS_SEGENTRY(sup, fs, lastseg, sup_bp); \ 195 sup->su_nbytes -= num << fs->lfs_bshift; \ 196 LFS_UBWRITE(sup_bp); \ 197 blocksreleased += num; \ 198 } 199 200 #define SEGDEC { \ 201 if (daddr != UNASSIGNED) { \ 202 if (lastseg != (seg = datosn(fs, daddr))) { \ 203 UPDATE_SEGUSE; \ 204 num = 1; \ 205 lastseg = seg; \ 206 } else \ 207 ++num; \ 208 } \ 209 } 210 211 /* 212 * Truncate the inode ip to at most length size. Update segment usage 213 * table information. 214 */ 215 /* ARGSUSED */ 216 int 217 lfs_truncate (ap) 218 struct vop_truncate_args *ap; 219 { 220 USES_VOP_UPDATE; 221 register INDIR *inp; 222 register int i; 223 register daddr_t *daddrp; 224 struct buf *bp, *sup_bp; 225 struct ifile *ifp; 226 struct inode *ip; 227 struct lfs *fs; 228 INDIR a[NIADDR + 2], a_end[NIADDR + 2]; 229 SEGUSE *sup; 230 daddr_t daddr, lastblock, lbn, olastblock; 231 long off, blocksreleased; 232 int error, depth, lastseg, num, offset, seg, size; 233 234 #ifdef VERBOSE 235 printf("lfs_truncate\n"); 236 #endif 237 vnode_pager_setsize(ap->a_vp, (u_long)ap->a_length); 238 239 ip = VTOI(ap->a_vp); 240 fs = ip->i_lfs; 241 242 /* If truncating the file to 0, update the version number. */ 243 if (ap->a_length == 0) { 244 LFS_IENTRY(ifp, fs, ip->i_number, bp); 245 ++ifp->if_version; 246 LFS_UBWRITE(bp); 247 } 248 249 /* If ap->a_length is larger than the file, just update the times. */ 250 if (ip->i_size <= ap->a_length) { 251 ip->i_flag |= ICHG|IUPD; 252 return (VOP_UPDATE(ap->a_vp, &time, &time, 1)); 253 } 254 255 /* 256 * Calculate index into inode's block list of last direct and indirect 257 * blocks (if any) which we want to keep. Lastblock is 0 when the 258 * file is truncated to 0. 259 */ 260 lastblock = lblkno(fs, ap->a_length + fs->lfs_bsize - 1); 261 olastblock = lblkno(fs, ip->i_size + fs->lfs_bsize - 1) - 1; 262 263 /* 264 * Update the size of the file. If the file is not being truncated to 265 * a block boundry, the contents of the partial block following the end 266 * of the file must be zero'ed in case it ever become accessable again 267 * because of subsequent file growth. 268 */ 269 offset = blkoff(fs, ap->a_length); 270 if (offset == 0) 271 ip->i_size = ap->a_length; 272 else { 273 lbn = lblkno(fs, ap->a_length); 274 #ifdef QUOTA 275 if (error = getinoquota(ip)) 276 return (error); 277 #endif 278 if (error = bread(ap->a_vp, lbn, fs->lfs_bsize, NOCRED, &bp)) 279 return (error); 280 ip->i_size = ap->a_length; 281 size = blksize(fs); 282 (void)vnode_pager_uncache(ap->a_vp); 283 bzero(bp->b_un.b_addr + offset, (unsigned)(size - offset)); 284 allocbuf(bp, size); 285 LFS_UBWRITE(bp); 286 } 287 /* 288 * Modify sup->su_nbyte counters for each deleted block; keep track 289 * of number of blocks removed for ip->i_blocks. 290 */ 291 blocksreleased = 0; 292 num = 0; 293 lastseg = -1; 294 295 for (lbn = olastblock; lbn >= lastblock;) { 296 lfs_bmaparray(ap->a_vp, lbn, &daddr, a, &depth); 297 if (lbn == olastblock) 298 for (i = NIADDR + 2; i--;) 299 a_end[i] = a[i]; 300 switch (depth) { 301 case 0: /* Direct block. */ 302 daddr = ip->i_db[lbn]; 303 SEGDEC; 304 ip->i_db[lbn] = 0; 305 --lbn; 306 break; 307 #ifdef DIAGNOSTIC 308 case 1: /* An indirect block. */ 309 panic("lfs_truncate: lfs_bmaparray returned depth 1"); 310 /* NOTREACHED */ 311 #endif 312 default: /* Chain of indirect blocks. */ 313 inp = a + --depth; 314 if (inp->in_off > 0 && lbn != lastblock) { 315 lbn -= inp->in_off < lbn - lastblock ? 316 inp->in_off : lbn - lastblock; 317 break; 318 } 319 for (; depth && (inp->in_off == 0 || lbn == lastblock); 320 --inp, --depth) { 321 /* 322 * XXX 323 * The indirect block may not yet exist, so 324 * bread will create one just so we can free 325 * it. 326 */ 327 if (bread(ap->a_vp, 328 inp->in_lbn, fs->lfs_bsize, NOCRED, &bp)) 329 panic("lfs_truncate: bread bno %d", 330 inp->in_lbn); 331 daddrp = bp->b_un.b_daddr + inp->in_off; 332 for (i = inp->in_off; 333 i++ <= a_end[depth].in_off;) { 334 daddr = *daddrp++; 335 SEGDEC; 336 } 337 a_end[depth].in_off = NINDIR(fs) - 1; 338 if (inp->in_off == 0) 339 brelse (bp); 340 else { 341 bzero(bp->b_un.b_daddr + inp->in_off, 342 fs->lfs_bsize - 343 inp->in_off * sizeof(daddr_t)); 344 LFS_UBWRITE(bp); 345 } 346 } 347 if (depth == 0 && a[1].in_off == 0) { 348 off = a[0].in_off; 349 daddr = ip->i_ib[off]; 350 SEGDEC; 351 ip->i_ib[off] = 0; 352 } 353 if (lbn == lastblock || lbn <= NDADDR) 354 --lbn; 355 else { 356 lbn -= NINDIR(fs); 357 if (lbn < lastblock) 358 lbn = lastblock; 359 } 360 } 361 } 362 UPDATE_SEGUSE; 363 ip->i_blocks -= blocksreleased; 364 /* 365 * XXX 366 * Currently, we don't know when we allocate an indirect block, so 367 * ip->i_blocks isn't getting incremented appropriately. As a result, 368 * when we delete any indirect blocks, we get a bad number here. 369 */ 370 if (ip->i_blocks < 0) 371 ip->i_blocks = 0; 372 ip->i_flag |= ICHG|IUPD; 373 (void)vinvalbuf(ap->a_vp, ap->a_length > 0); 374 error = VOP_UPDATE(ap->a_vp, &time, &time, MNT_WAIT); 375 return (0); 376 } 377