1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ffs_vnops.c 7.100 (Berkeley) 03/03/93 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/resourcevar.h> 13 #include <sys/kernel.h> 14 #include <sys/file.h> 15 #include <sys/stat.h> 16 #include <sys/buf.h> 17 #include <sys/proc.h> 18 #include <sys/conf.h> 19 #include <sys/mount.h> 20 #include <sys/vnode.h> 21 #include <sys/malloc.h> 22 23 #include <vm/vm.h> 24 25 #include <miscfs/specfs/specdev.h> 26 #include <miscfs/fifofs/fifo.h> 27 28 #include <ufs/ufs/lockf.h> 29 #include <ufs/ufs/quota.h> 30 #include <ufs/ufs/inode.h> 31 #include <ufs/ufs/dir.h> 32 #include <ufs/ufs/ufs_extern.h> 33 34 #include <ufs/ffs/fs.h> 35 #include <ufs/ffs/ffs_extern.h> 36 37 /* Global vfs data structures for ufs. */ 38 int (**ffs_vnodeop_p)(); 39 struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 40 { &vop_default_desc, vn_default_error }, 41 { &vop_lookup_desc, ufs_lookup }, /* lookup */ 42 { &vop_create_desc, ufs_create }, /* create */ 43 { &vop_mknod_desc, ufs_mknod }, /* mknod */ 44 { &vop_open_desc, ufs_open }, /* open */ 45 { &vop_close_desc, ufs_close }, /* close */ 46 { &vop_access_desc, ufs_access }, /* access */ 47 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 48 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 49 { &vop_read_desc, ffs_read }, /* read */ 50 { &vop_write_desc, ffs_write }, /* write */ 51 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 52 { &vop_select_desc, ufs_select }, /* select */ 53 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 54 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 55 { &vop_seek_desc, ufs_seek }, /* seek */ 56 { &vop_remove_desc, ufs_remove }, /* remove */ 57 { &vop_link_desc, ufs_link }, /* link */ 58 { &vop_rename_desc, ufs_rename }, /* rename */ 59 { &vop_mkdir_desc, ufs_mkdir }, /* mkdir */ 60 { &vop_rmdir_desc, ufs_rmdir }, /* rmdir */ 61 { &vop_symlink_desc, ufs_symlink }, /* symlink */ 62 { &vop_readdir_desc, ufs_readdir }, /* readdir */ 63 { &vop_readlink_desc, ufs_readlink }, /* readlink */ 64 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 65 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 66 { &vop_reclaim_desc, ufs_reclaim }, /* reclaim */ 67 { &vop_lock_desc, ufs_lock }, /* lock */ 68 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 69 { &vop_bmap_desc, ufs_bmap }, /* bmap */ 70 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 71 { &vop_print_desc, ufs_print }, /* print */ 72 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 73 { &vop_advlock_desc, ufs_advlock }, /* advlock */ 74 { &vop_blkatoff_desc, ffs_blkatoff }, /* blkatoff */ 75 { &vop_valloc_desc, ffs_valloc }, /* valloc */ 76 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 77 { &vop_truncate_desc, ffs_truncate }, /* truncate */ 78 { &vop_update_desc, ffs_update }, /* update */ 79 { &vop_bwrite_desc, vn_bwrite }, 80 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 81 }; 82 struct vnodeopv_desc ffs_vnodeop_opv_desc = 83 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 84 85 int (**ffs_specop_p)(); 86 struct vnodeopv_entry_desc ffs_specop_entries[] = { 87 { &vop_default_desc, vn_default_error }, 88 { &vop_lookup_desc, spec_lookup }, /* lookup */ 89 { &vop_create_desc, spec_create }, /* create */ 90 { &vop_mknod_desc, spec_mknod }, /* mknod */ 91 { &vop_open_desc, spec_open }, /* open */ 92 { &vop_close_desc, ufsspec_close }, /* close */ 93 { &vop_access_desc, ufs_access }, /* access */ 94 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 95 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 96 { &vop_read_desc, ufsspec_read }, /* read */ 97 { &vop_write_desc, ufsspec_write }, /* write */ 98 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 99 { &vop_select_desc, spec_select }, /* select */ 100 { &vop_mmap_desc, spec_mmap }, /* mmap */ 101 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 102 { &vop_seek_desc, spec_seek }, /* seek */ 103 { &vop_remove_desc, spec_remove }, /* remove */ 104 { &vop_link_desc, spec_link }, /* link */ 105 { &vop_rename_desc, spec_rename }, /* rename */ 106 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 107 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 108 { &vop_symlink_desc, spec_symlink }, /* symlink */ 109 { &vop_readdir_desc, spec_readdir }, /* readdir */ 110 { &vop_readlink_desc, spec_readlink }, /* readlink */ 111 { &vop_abortop_desc, spec_abortop }, /* abortop */ 112 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 113 { &vop_reclaim_desc, ufs_reclaim }, /* reclaim */ 114 { &vop_lock_desc, ufs_lock }, /* lock */ 115 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 116 { &vop_bmap_desc, spec_bmap }, /* bmap */ 117 { &vop_strategy_desc, spec_strategy }, /* strategy */ 118 { &vop_print_desc, ufs_print }, /* print */ 119 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 120 { &vop_advlock_desc, spec_advlock }, /* advlock */ 121 { &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */ 122 { &vop_valloc_desc, spec_valloc }, /* valloc */ 123 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 124 { &vop_truncate_desc, spec_truncate }, /* truncate */ 125 { &vop_update_desc, ffs_update }, /* update */ 126 { &vop_bwrite_desc, vn_bwrite }, 127 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 128 }; 129 struct vnodeopv_desc ffs_specop_opv_desc = 130 { &ffs_specop_p, ffs_specop_entries }; 131 132 #ifdef FIFO 133 int (**ffs_fifoop_p)(); 134 struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 135 { &vop_default_desc, vn_default_error }, 136 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 137 { &vop_create_desc, fifo_create }, /* create */ 138 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 139 { &vop_open_desc, fifo_open }, /* open */ 140 { &vop_close_desc, ufsfifo_close }, /* close */ 141 { &vop_access_desc, ufs_access }, /* access */ 142 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 143 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 144 { &vop_read_desc, ufsfifo_read }, /* read */ 145 { &vop_write_desc, ufsfifo_write }, /* write */ 146 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 147 { &vop_select_desc, fifo_select }, /* select */ 148 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 149 { &vop_fsync_desc, ffs_fsync }, /* fsync */ 150 { &vop_seek_desc, fifo_seek }, /* seek */ 151 { &vop_remove_desc, fifo_remove }, /* remove */ 152 { &vop_link_desc, fifo_link }, /* link */ 153 { &vop_rename_desc, fifo_rename }, /* rename */ 154 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 155 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 156 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 157 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 158 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 159 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 160 { &vop_inactive_desc, ufs_inactive }, /* inactive */ 161 { &vop_reclaim_desc, ufs_reclaim }, /* reclaim */ 162 { &vop_lock_desc, ufs_lock }, /* lock */ 163 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 164 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 165 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 166 { &vop_print_desc, ufs_print }, /* print */ 167 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 168 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 169 { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 170 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 171 { &vop_vfree_desc, ffs_vfree }, /* vfree */ 172 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 173 { &vop_update_desc, ffs_update }, /* update */ 174 { &vop_bwrite_desc, vn_bwrite }, 175 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 176 }; 177 struct vnodeopv_desc ffs_fifoop_opv_desc = 178 { &ffs_fifoop_p, ffs_fifoop_entries }; 179 #endif /* FIFO */ 180 181 /* 182 * Enabling cluster read/write operations. 183 * Default is off until we trust them. 184 */ 185 int doclusterread = 0; 186 int doclusterwrite = 0; 187 188 /* 189 * Vnode op for reading. 190 */ 191 /* ARGSUSED */ 192 ffs_read(ap) 193 struct vop_read_args /* { 194 struct vnode *a_vp; 195 struct uio *a_uio; 196 int a_ioflag; 197 struct ucred *a_cred; 198 } */ *ap; 199 { 200 register struct vnode *vp = ap->a_vp; 201 register struct inode *ip = VTOI(vp); 202 register struct uio *uio = ap->a_uio; 203 register struct fs *fs; 204 struct buf *bp; 205 daddr_t lbn, bn, rablock; 206 off_t diff; 207 int type, rasize, error = 0; 208 long size, n, on; 209 210 type = ip->i_mode & IFMT; 211 #ifdef DIAGNOSTIC 212 if (uio->uio_rw != UIO_READ) 213 panic("ffs_read mode"); 214 if (type != IFDIR && type != IFREG && type != IFLNK) 215 panic("ffs_read type"); 216 if (type == IFLNK && (int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 217 panic("read short symlink"); 218 #endif 219 if (uio->uio_resid == 0) 220 return (0); 221 fs = ip->i_fs; 222 if ((u_quad_t)uio->uio_offset > fs->fs_maxfilesize) 223 return (EFBIG); 224 ip->i_flag |= IACC; 225 do { 226 lbn = lblkno(fs, uio->uio_offset); 227 on = blkoff(fs, uio->uio_offset); 228 n = min((unsigned)(fs->fs_bsize - on), uio->uio_resid); 229 diff = ip->i_size - uio->uio_offset; 230 if (diff <= 0) 231 return (0); 232 if (diff < n) 233 n = diff; 234 size = blksize(fs, ip, lbn); 235 rablock = lbn + 1; 236 if (doclusterread && lblktosize(fs, rablock) <= ip->i_size) { 237 error = cluster_read(vp, ip->i_size, lbn, size, 238 NOCRED, &bp); 239 } else if (vp->v_lastr + 1 == lbn && 240 lblktosize(fs, rablock) < ip->i_size) { 241 rasize = blksize(fs, ip, rablock); 242 error = breadn(vp, lbn, size, &rablock, 243 &rasize, 1, NOCRED, &bp); 244 } else 245 error = bread(vp, lbn, size, NOCRED, &bp); 246 vp->v_lastr = lbn; 247 n = min(n, size - bp->b_resid); 248 if (error) { 249 brelse(bp); 250 return (error); 251 } 252 error = uiomove(bp->b_un.b_addr + on, (int)n, uio); 253 if (type == IFREG && 254 (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size)) 255 bp->b_flags |= B_AGE; 256 brelse(bp); 257 } while (error == 0 && uio->uio_resid > 0 && n != 0); 258 return (error); 259 } 260 261 /* 262 * Vnode op for writing. 263 */ 264 ffs_write(ap) 265 struct vop_write_args /* { 266 struct vnode *a_vp; 267 struct uio *a_uio; 268 int a_ioflag; 269 struct ucred *a_cred; 270 } */ *ap; 271 { 272 register struct vnode *vp = ap->a_vp; 273 register struct uio *uio = ap->a_uio; 274 register struct inode *ip = VTOI(vp); 275 register struct fs *fs; 276 struct proc *p = uio->uio_procp; 277 int ioflag = ap->a_ioflag; 278 struct timeval tv; 279 struct buf *bp; 280 daddr_t lbn, bn; 281 off_t osize; 282 int n, on, flags; 283 int size, resid, error = 0; 284 285 #ifdef DIAGNOSTIC 286 if (uio->uio_rw != UIO_WRITE) 287 panic("ffs_write mode"); 288 #endif 289 switch (vp->v_type) { 290 case VREG: 291 if (ioflag & IO_APPEND) 292 uio->uio_offset = ip->i_size; 293 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 294 return (EPERM); 295 /* fall through */ 296 case VLNK: 297 break; 298 299 case VDIR: 300 if ((ioflag & IO_SYNC) == 0) 301 panic("ffs_write nonsync dir write"); 302 break; 303 304 default: 305 panic("ffs_write type"); 306 } 307 if (uio->uio_resid == 0) 308 return (0); 309 fs = ip->i_fs; 310 if (uio->uio_offset < 0 || 311 (u_quad_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 312 return (EFBIG); 313 /* 314 * Maybe this should be above the vnode op call, but so long as 315 * file servers have no limits, i don't think it matters 316 */ 317 if (vp->v_type == VREG && p && 318 uio->uio_offset + uio->uio_resid > 319 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 320 psignal(p, SIGXFSZ); 321 return (EFBIG); 322 } 323 resid = uio->uio_resid; 324 osize = ip->i_size; 325 flags = 0; 326 if (ioflag & IO_SYNC) 327 flags = B_SYNC; 328 do { 329 lbn = lblkno(fs, uio->uio_offset); 330 on = blkoff(fs, uio->uio_offset); 331 n = min((unsigned)(fs->fs_bsize - on), uio->uio_resid); 332 if (n < fs->fs_bsize) 333 flags |= B_CLRBUF; 334 else 335 flags &= ~B_CLRBUF; 336 if (error = ffs_balloc(ip, lbn, on + n, ap->a_cred, &bp, flags)) 337 break; 338 bn = bp->b_blkno; 339 if (uio->uio_offset + n > ip->i_size) { 340 ip->i_size = uio->uio_offset + n; 341 vnode_pager_setsize(vp, (u_long)ip->i_size); 342 } 343 size = blksize(fs, ip, lbn); 344 (void) vnode_pager_uncache(vp); 345 n = min(n, size - bp->b_resid); 346 error = uiomove(bp->b_un.b_addr + on, n, uio); 347 if (ioflag & IO_SYNC) 348 (void) bwrite(bp); 349 else if (n + on == fs->fs_bsize) { 350 if (doclusterwrite) { 351 cluster_write(bp, ip->i_size); 352 } else { 353 bp->b_flags |= B_AGE; 354 bawrite(bp); 355 } 356 } else 357 bdwrite(bp); 358 ip->i_flag |= IUPD|ICHG; 359 if (ap->a_cred && ap->a_cred->cr_uid != 0) 360 ip->i_mode &= ~(ISUID|ISGID); 361 } while (error == 0 && uio->uio_resid > 0 && n != 0); 362 if (error && (ioflag & IO_UNIT)) { 363 (void)VOP_TRUNCATE(vp, osize, ioflag & IO_SYNC, ap->a_cred, 364 uio->uio_procp); 365 uio->uio_offset -= resid - uio->uio_resid; 366 uio->uio_resid = resid; 367 } 368 if (!error && (ioflag & IO_SYNC)) { 369 tv = time; 370 error = VOP_UPDATE(vp, &tv, &tv, 1); 371 } 372 return (error); 373 } 374 375 /* 376 * Synch an open file. 377 */ 378 /* ARGSUSED */ 379 int 380 ffs_fsync(ap) 381 struct vop_fsync_args /* { 382 struct vnode *a_vp; 383 struct ucred *a_cred; 384 int a_waitfor; 385 struct proc *a_p; 386 } */ *ap; 387 { 388 register struct vnode *vp = ap->a_vp; 389 struct inode *ip = VTOI(vp); 390 register struct buf *bp; 391 struct timeval tv; 392 struct buf *nbp; 393 int s; 394 395 /* 396 * Flush all dirty buffers associated with a vnode. 397 */ 398 loop: 399 s = splbio(); 400 for (bp = vp->v_dirtyblkhd.le_next; bp; bp = nbp) { 401 nbp = bp->b_vnbufs.qe_next; 402 if ((bp->b_flags & B_BUSY)) 403 continue; 404 if ((bp->b_flags & B_DELWRI) == 0) 405 panic("ffs_fsync: not dirty"); 406 bremfree(bp); 407 bp->b_flags |= B_BUSY; 408 splx(s); 409 /* 410 * Wait for I/O associated with indirect blocks to complete, 411 * since there is no way to quickly wait for them below. 412 */ 413 if (bp->b_vp == vp || ap->a_waitfor == MNT_NOWAIT) 414 (void) bawrite(bp); 415 else 416 (void) bwrite(bp); 417 goto loop; 418 } 419 if (ap->a_waitfor == MNT_WAIT) { 420 while (vp->v_numoutput) { 421 vp->v_flag |= VBWAIT; 422 sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1); 423 } 424 #ifdef DIAGNOSTIC 425 if (vp->v_dirtyblkhd.le_next) { 426 vprint("ffs_fsync: dirty", vp); 427 goto loop; 428 } 429 #endif 430 } 431 splx(s); 432 tv = time; 433 return (VOP_UPDATE(ap->a_vp, &tv, &tv, ap->a_waitfor == MNT_WAIT)); 434 } 435 436