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_vnops.c 7.79 (Berkeley) 04/21/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/namei.h> 13 #include <sys/resourcevar.h> 14 #include <sys/kernel.h> 15 #include <sys/file.h> 16 #include <sys/stat.h> 17 #include <sys/buf.h> 18 #include <sys/proc.h> 19 #include <sys/conf.h> 20 #include <sys/mount.h> 21 #include <sys/vnode.h> 22 #include <sys/specdev.h> 23 #include <sys/fifo.h> 24 #include <sys/malloc.h> 25 26 #include <ufs/ufs/quota.h> 27 #include <ufs/ufs/inode.h> 28 #include <ufs/ufs/dir.h> 29 #include <ufs/ufs/ufs_extern.h> 30 31 #include <ufs/lfs/lfs.h> 32 #include <ufs/lfs/lfs_extern.h> 33 34 /* Global vfs data structures for lfs. */ 35 struct vnodeops lfs_vnodeops = { 36 ufs_lookup, /* lookup */ 37 ufs_create, /* create */ 38 ufs_mknod, /* mknod */ 39 ufs_open, /* open */ 40 ufs_close, /* close */ 41 ufs_access, /* access */ 42 ufs_getattr, /* getattr */ 43 ufs_setattr, /* setattr */ 44 lfs_read, /* read */ 45 lfs_write, /* write */ 46 ufs_ioctl, /* ioctl */ 47 ufs_select, /* select */ 48 ufs_mmap, /* mmap */ 49 lfs_fsync, /* fsync */ 50 ufs_seek, /* seek */ 51 ufs_remove, /* remove */ 52 ufs_link, /* link */ 53 ufs_rename, /* rename */ 54 ufs_mkdir, /* mkdir */ 55 ufs_rmdir, /* rmdir */ 56 ufs_symlink, /* symlink */ 57 ufs_readdir, /* readdir */ 58 ufs_readlink, /* readlink */ 59 ufs_abortop, /* abortop */ 60 lfs_inactive, /* inactive */ 61 ufs_reclaim, /* reclaim */ 62 ufs_lock, /* lock */ 63 ufs_unlock, /* unlock */ 64 lfs_bmap, /* bmap */ 65 ufs_strategy, /* strategy */ 66 ufs_print, /* print */ 67 ufs_islocked, /* islocked */ 68 ufs_advlock, /* advlock */ 69 lfs_blkatoff, /* blkatoff */ 70 lfs_vget, /* vget */ 71 lfs_valloc, /* valloc */ 72 lfs_vfree, /* vfree */ 73 lfs_truncate, /* truncate */ 74 lfs_update, /* update */ 75 lfs_bwrite, /* bwrite */ 76 }; 77 78 struct vnodeops lfs_specops = { 79 spec_lookup, /* lookup */ 80 spec_create, /* create */ 81 spec_mknod, /* mknod */ 82 spec_open, /* open */ 83 ufsspec_close, /* close */ 84 ufs_access, /* access */ 85 ufs_getattr, /* getattr */ 86 ufs_setattr, /* setattr */ 87 ufsspec_read, /* read */ 88 ufsspec_write, /* write */ 89 spec_ioctl, /* ioctl */ 90 spec_select, /* select */ 91 spec_mmap, /* mmap */ 92 spec_fsync, /* fsync */ 93 spec_seek, /* seek */ 94 spec_remove, /* remove */ 95 spec_link, /* link */ 96 spec_rename, /* rename */ 97 spec_mkdir, /* mkdir */ 98 spec_rmdir, /* rmdir */ 99 spec_symlink, /* symlink */ 100 spec_readdir, /* readdir */ 101 spec_readlink, /* readlink */ 102 spec_abortop, /* abortop */ 103 lfs_inactive, /* inactive */ 104 ufs_reclaim, /* reclaim */ 105 ufs_lock, /* lock */ 106 ufs_unlock, /* unlock */ 107 spec_bmap, /* bmap */ 108 spec_strategy, /* strategy */ 109 ufs_print, /* print */ 110 ufs_islocked, /* islocked */ 111 spec_advlock, /* advlock */ 112 spec_blkatoff, /* blkatoff */ 113 spec_vget, /* vget */ 114 spec_valloc, /* valloc */ 115 spec_vfree, /* vfree */ 116 spec_truncate, /* truncate */ 117 lfs_update, /* update */ 118 lfs_bwrite, /* bwrite */ 119 }; 120 121 #ifdef FIFO 122 struct vnodeops lfs_fifoops = { 123 fifo_lookup, /* lookup */ 124 fifo_create, /* create */ 125 fifo_mknod, /* mknod */ 126 fifo_open, /* open */ 127 ufsfifo_close, /* close */ 128 ufs_access, /* access */ 129 ufs_getattr, /* getattr */ 130 ufs_setattr, /* setattr */ 131 ufsfifo_read, /* read */ 132 ufsfifo_write, /* write */ 133 fifo_ioctl, /* ioctl */ 134 fifo_select, /* select */ 135 fifo_mmap, /* mmap */ 136 fifo_fsync, /* fsync */ 137 fifo_seek, /* seek */ 138 fifo_remove, /* remove */ 139 fifo_link, /* link */ 140 fifo_rename, /* rename */ 141 fifo_mkdir, /* mkdir */ 142 fifo_rmdir, /* rmdir */ 143 fifo_symlink, /* symlink */ 144 fifo_readdir, /* readdir */ 145 fifo_readlink, /* readlink */ 146 fifo_abortop, /* abortop */ 147 lfs_inactive, /* inactive */ 148 ufs_reclaim, /* reclaim */ 149 ufs_lock, /* lock */ 150 ufs_unlock, /* unlock */ 151 fifo_bmap, /* bmap */ 152 fifo_strategy, /* strategy */ 153 ufs_print, /* print */ 154 ufs_islocked, /* islocked */ 155 fifo_advlock, /* advlock */ 156 fifo_blkatoff, /* blkatoff */ 157 fifo_vget, /* vget */ 158 fifo_valloc, /* valloc */ 159 fifo_vfree, /* vfree */ 160 fifo_truncate, /* truncate */ 161 lfs_update, /* update */ 162 lfs_bwrite, /* bwrite */ 163 }; 164 #endif /* FIFO */ 165 166 /* 167 * Vnode op for reading. 168 */ 169 /* ARGSUSED */ 170 lfs_read(vp, uio, ioflag, cred) 171 struct vnode *vp; 172 register struct uio *uio; 173 int ioflag; 174 struct ucred *cred; 175 { 176 register struct inode *ip = VTOI(vp); 177 register struct lfs *fs; /* LFS */ 178 struct buf *bp; 179 daddr_t lbn, bn, rablock; 180 int size, error = 0; 181 long n, on, type; 182 off_t diff; 183 184 #ifdef VERBOSE 185 printf("lfs_read: ino %d\n", ip->i_number); 186 #endif 187 #ifdef DIAGNOSTIC 188 if (uio->uio_rw != UIO_READ) 189 panic("ufs_read mode"); 190 type = ip->i_mode & IFMT; 191 if (type != IFDIR && type != IFREG && type != IFLNK) 192 panic("ufs_read type"); 193 #endif 194 if (uio->uio_resid == 0) 195 return (0); 196 if (uio->uio_offset < 0) 197 return (EINVAL); 198 ip->i_flag |= IACC; 199 200 fs = ip->i_lfs; /* LFS */ 201 do { 202 lbn = lblkno(fs, uio->uio_offset); 203 on = blkoff(fs, uio->uio_offset); 204 n = MIN((unsigned)(fs->lfs_bsize - on), uio->uio_resid); 205 diff = ip->i_size - uio->uio_offset; 206 if (diff <= 0) 207 return (0); 208 if (diff < n) 209 n = diff; 210 size = blksize(fs); /* LFS */ 211 rablock = lbn + 1; 212 if (vp->v_lastr + 1 == lbn && 213 lblktosize(fs, rablock) < ip->i_size) 214 error = breadn(ITOV(ip), lbn, size, &rablock, 215 &size, 1, NOCRED, &bp); 216 else 217 error = bread(ITOV(ip), lbn, size, NOCRED, &bp); 218 vp->v_lastr = lbn; 219 n = MIN(n, size - bp->b_resid); 220 if (error) { 221 brelse(bp); 222 return (error); 223 } 224 error = uiomove(bp->b_un.b_addr + on, (int)n, uio); 225 if (n + on == fs->lfs_bsize || uio->uio_offset == ip->i_size) 226 bp->b_flags |= B_AGE; 227 brelse(bp); 228 } while (error == 0 && uio->uio_resid > 0 && n != 0); 229 return (error); 230 } 231 232 /* 233 * Vnode op for writing. 234 */ 235 lfs_write(vp, uio, ioflag, cred) 236 register struct vnode *vp; 237 struct uio *uio; 238 int ioflag; 239 struct ucred *cred; 240 { 241 struct proc *p = uio->uio_procp; 242 register struct inode *ip = VTOI(vp); 243 register struct lfs *fs; 244 struct buf *bp; 245 daddr_t lbn; 246 off_t osize; 247 int n, on, flags, newblock; 248 int size, resid, error = 0; 249 250 #ifdef VERBOSE 251 printf("lfs_write ino %d\n", ip->i_number); 252 #endif 253 #ifdef DIAGNOSTIC 254 if (uio->uio_rw != UIO_WRITE) 255 panic("lfs_write mode"); 256 #endif 257 switch (vp->v_type) { 258 case VREG: 259 if (ioflag & IO_APPEND) 260 uio->uio_offset = ip->i_size; 261 /* fall through */ 262 case VLNK: 263 break; 264 265 case VDIR: 266 /* XXX This may not be correct for LFS. */ 267 if ((ioflag & IO_SYNC) == 0) 268 panic("lfs_write nonsync dir write"); 269 break; 270 271 default: 272 panic("lfs_write type"); 273 } 274 if (uio->uio_offset < 0) 275 return (EINVAL); 276 if (uio->uio_resid == 0) 277 return (0); 278 /* 279 * Maybe this should be above the vnode op call, but so long as 280 * file servers have no limits, i don't think it matters 281 */ 282 if (vp->v_type == VREG && p && 283 uio->uio_offset + uio->uio_resid > 284 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 285 psignal(p, SIGXFSZ); 286 return (EFBIG); 287 } 288 resid = uio->uio_resid; 289 osize = ip->i_size; 290 fs = ip->i_lfs; /* LFS */ 291 flags = 0; 292 #ifdef NOTLFS 293 if (ioflag & IO_SYNC) 294 flags = B_SYNC; 295 #endif 296 do { 297 lbn = lblkno(fs, uio->uio_offset); 298 on = blkoff(fs, uio->uio_offset); 299 n = MIN((unsigned)(fs->lfs_bsize - on), uio->uio_resid); 300 if (error = lfs_balloc(vp, n, lbn, &bp)) 301 break; 302 if (uio->uio_offset + n > ip->i_size) { 303 ip->i_size = uio->uio_offset + n; 304 vnode_pager_setsize(vp, (u_long)ip->i_size); 305 } 306 size = blksize(fs); 307 (void) vnode_pager_uncache(vp); 308 n = MIN(n, size - bp->b_resid); 309 error = uiomove(bp->b_un.b_addr + on, n, uio); 310 #ifdef NOTLFS /* LFS */ 311 if (ioflag & IO_SYNC) 312 (void) bwrite(bp); 313 else if (n + on == fs->fs_bsize) { 314 bp->b_flags |= B_AGE; 315 bawrite(bp); 316 } else 317 bdwrite(bp); 318 ip->i_flag |= IUPD|ICHG; 319 #else 320 /* XXX This doesn't handle IO_SYNC. */ 321 LFS_UBWRITE(bp); 322 #endif 323 if (cred->cr_uid != 0) 324 ip->i_mode &= ~(ISUID|ISGID); 325 } while (error == 0 && uio->uio_resid > 0 && n != 0); 326 if (error && (ioflag & IO_UNIT)) { 327 (void)lfs_truncate(vp, osize, ioflag & IO_SYNC, cred); 328 uio->uio_offset -= resid - uio->uio_resid; 329 uio->uio_resid = resid; 330 } 331 if (!error && (ioflag & IO_SYNC)) 332 error = lfs_update(vp, &time, &time, 1); 333 return (error); 334 } 335 336 /* 337 * Synch an open file. 338 */ 339 /* ARGSUSED */ 340 lfs_fsync(vp, fflags, cred, waitfor, p) 341 struct vnode *vp; 342 int fflags; 343 struct ucred *cred; 344 int waitfor; 345 struct proc *p; 346 { 347 struct inode *ip; 348 349 #ifdef VERBOSE 350 printf("lfs_fsync\n"); 351 #endif 352 ip = VTOI(vp); 353 if (fflags & FWRITE) 354 ip->i_flag |= ICHG; 355 return (lfs_update(vp, &time, &time, waitfor == MNT_WAIT)); 356 } 357 358 /* 359 * Last reference to an inode, write the inode out and if necessary, 360 * truncate and deallocate the file. 361 */ 362 int 363 lfs_inactive(vp, p) 364 struct vnode *vp; 365 struct proc *p; 366 { 367 extern int prtactive; 368 register struct inode *ip; 369 int mode, error; 370 371 #ifdef VERBOSE 372 printf("lfs_inactive\n"); 373 #endif 374 if (prtactive && vp->v_usecount != 0) 375 vprint("lfs_inactive: pushing active", vp); 376 377 /* Get rid of inodes related to stale file handles. */ 378 ip = VTOI(vp); 379 if (ip->i_mode == 0) { 380 if ((vp->v_flag & VXLOCK) == 0) 381 vgone(vp); 382 return (0); 383 } 384 385 error = 0; 386 ILOCK(ip); 387 if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 388 #ifdef QUOTA 389 if (!getinoquota(ip)) 390 (void)chkiq(ip, -1, NOCRED, 0); 391 #endif 392 error = lfs_truncate(vp, (off_t)0, 0, NOCRED); 393 mode = ip->i_mode; 394 ip->i_mode = 0; 395 ip->i_rdev = 0; 396 ip->i_flag |= IUPD|ICHG; 397 lfs_vfree(vp, ip->i_number, mode); 398 } 399 if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) 400 lfs_update(vp, &time, &time, 0); 401 IUNLOCK(ip); 402 ip->i_flag = 0; 403 /* 404 * If we are done with the inode, reclaim it 405 * so that it can be reused immediately. 406 */ 407 if (vp->v_usecount == 0 && ip->i_mode == 0) 408 vgone(vp); 409 return (error); 410 } 411