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 7.83 (Berkeley) 06/04/92 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 <vm/vm.h> 27 28 #include <ufs/ufs/quota.h> 29 #include <ufs/ufs/inode.h> 30 #include <ufs/ufs/dir.h> 31 #include <ufs/ufs/ufs_extern.h> 32 33 #include <ufs/lfs/lfs.h> 34 #include <ufs/lfs/lfs_extern.h> 35 36 /* Global vfs data structures for lfs. */ 37 int (**lfs_vnodeop_p)(); 38 struct vnodeopv_entry_desc lfs_vnodeop_entries[] = { 39 { &vop_default_desc, vn_default_error }, 40 { &vop_lookup_desc, ufs_lookup }, /* lookup */ 41 { &vop_create_desc, ufs_create }, /* create */ 42 { &vop_mknod_desc, ufs_mknod }, /* mknod */ 43 { &vop_open_desc, ufs_open }, /* open */ 44 { &vop_close_desc, ufs_close }, /* close */ 45 { &vop_access_desc, ufs_access }, /* access */ 46 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 47 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 48 { &vop_read_desc, lfs_read }, /* read */ 49 { &vop_write_desc, lfs_write }, /* write */ 50 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 51 { &vop_select_desc, ufs_select }, /* select */ 52 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 53 { &vop_fsync_desc, lfs_fsync }, /* fsync */ 54 { &vop_seek_desc, ufs_seek }, /* seek */ 55 { &vop_remove_desc, ufs_remove }, /* remove */ 56 { &vop_link_desc, ufs_link }, /* link */ 57 { &vop_rename_desc, ufs_rename }, /* rename */ 58 { &vop_mkdir_desc, ufs_mkdir }, /* mkdir */ 59 { &vop_rmdir_desc, ufs_rmdir }, /* rmdir */ 60 { &vop_symlink_desc, ufs_symlink }, /* symlink */ 61 { &vop_readdir_desc, ufs_readdir }, /* readdir */ 62 { &vop_readlink_desc, ufs_readlink }, /* readlink */ 63 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 64 { &vop_inactive_desc, lfs_inactive }, /* inactive */ 65 { &vop_reclaim_desc, ufs_reclaim }, /* reclaim */ 66 { &vop_lock_desc, ufs_lock }, /* lock */ 67 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 68 { &vop_bmap_desc, lfs_bmap }, /* bmap */ 69 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 70 { &vop_print_desc, ufs_print }, /* print */ 71 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 72 { &vop_advlock_desc, ufs_advlock }, /* advlock */ 73 { &vop_blkatoff_desc, lfs_blkatoff }, /* blkatoff */ 74 { &vop_vget_desc, lfs_vget }, /* vget */ 75 { &vop_valloc_desc, lfs_valloc }, /* valloc */ 76 { &vop_vfree_desc, lfs_vfree }, /* vfree */ 77 { &vop_truncate_desc, lfs_truncate }, /* truncate */ 78 { &vop_update_desc, lfs_update }, /* update */ 79 { &vop_bwrite_desc, lfs_bwrite }, /* bwrite */ 80 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 81 }; 82 struct vnodeopv_desc lfs_vnodeop_opv_desc = 83 { &lfs_vnodeop_p, lfs_vnodeop_entries }; 84 85 int (**lfs_specop_p)(); 86 struct vnodeopv_entry_desc lfs_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, spec_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, lfs_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_vget_desc, spec_vget }, /* vget */ 123 { &vop_valloc_desc, spec_valloc }, /* valloc */ 124 { &vop_vfree_desc, spec_vfree }, /* vfree */ 125 { &vop_truncate_desc, spec_truncate }, /* truncate */ 126 { &vop_update_desc, lfs_update }, /* update */ 127 { &vop_bwrite_desc, lfs_bwrite }, /* bwrite */ 128 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 129 }; 130 struct vnodeopv_desc lfs_specop_opv_desc = 131 { &lfs_specop_p, lfs_specop_entries }; 132 133 #ifdef FIFO 134 int (**lfs_fifoop_p)(); 135 struct vnodeopv_entry_desc lfs_fifoop_entries[] = { 136 { &vop_default_desc, vn_default_error }, 137 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 138 { &vop_create_desc, fifo_create }, /* create */ 139 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 140 { &vop_open_desc, fifo_open }, /* open */ 141 { &vop_close_desc, ufsfifo_close }, /* close */ 142 { &vop_access_desc, ufs_access }, /* access */ 143 { &vop_getattr_desc, ufs_getattr }, /* getattr */ 144 { &vop_setattr_desc, ufs_setattr }, /* setattr */ 145 { &vop_read_desc, ufsfifo_read }, /* read */ 146 { &vop_write_desc, ufsfifo_write }, /* write */ 147 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 148 { &vop_select_desc, fifo_select }, /* select */ 149 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 150 { &vop_fsync_desc, fifo_fsync }, /* fsync */ 151 { &vop_seek_desc, fifo_seek }, /* seek */ 152 { &vop_remove_desc, fifo_remove }, /* remove */ 153 { &vop_link_desc, fifo_link }, /* link */ 154 { &vop_rename_desc, fifo_rename }, /* rename */ 155 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 156 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 157 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 158 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 159 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 160 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 161 { &vop_inactive_desc, lfs_inactive }, /* inactive */ 162 { &vop_reclaim_desc, ufs_reclaim }, /* reclaim */ 163 { &vop_lock_desc, ufs_lock }, /* lock */ 164 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 165 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 166 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 167 { &vop_print_desc, ufs_print }, /* print */ 168 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 169 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 170 { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 171 { &vop_vget_desc, fifo_vget }, /* vget */ 172 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 173 { &vop_vfree_desc, fifo_vfree }, /* vfree */ 174 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 175 { &vop_update_desc, lfs_update }, /* update */ 176 { &vop_bwrite_desc, lfs_bwrite }, /* bwrite */ 177 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 178 }; 179 struct vnodeopv_desc lfs_fifoop_opv_desc = 180 { &lfs_fifoop_p, lfs_fifoop_entries }; 181 #endif /* FIFO */ 182 183 /* 184 * Vnode op for reading. 185 */ 186 /* ARGSUSED */ 187 lfs_read (ap) 188 struct vop_read_args *ap; 189 { 190 register struct uio *uio = ap->a_uio; 191 register struct inode *ip = VTOI(ap->a_vp); 192 register struct lfs *fs; /* LFS */ 193 struct buf *bp; 194 daddr_t lbn, bn, rablock; 195 int size, error = 0; 196 long n, on, type; 197 off_t diff; 198 199 #ifdef VERBOSE 200 printf("lfs_read: ino %d\n", ip->i_number); 201 #endif 202 #ifdef DIAGNOSTIC 203 if (uio->uio_rw != UIO_READ) 204 panic("ufs_read mode"); 205 type = ip->i_mode & IFMT; 206 if (type != IFDIR && type != IFREG && type != IFLNK) 207 panic("ufs_read type"); 208 #endif 209 if (uio->uio_resid == 0) 210 return (0); 211 if (uio->uio_offset < 0) 212 return (EINVAL); 213 ip->i_flag |= IACC; 214 215 fs = ip->i_lfs; /* LFS */ 216 do { 217 lbn = lblkno(fs, uio->uio_offset); 218 on = blkoff(fs, uio->uio_offset); 219 n = MIN((unsigned)(fs->lfs_bsize - on), uio->uio_resid); 220 diff = ip->i_size - uio->uio_offset; 221 if (diff <= 0) 222 return (0); 223 if (diff < n) 224 n = diff; 225 size = blksize(fs); /* LFS */ 226 rablock = lbn + 1; 227 if (ap->a_vp->v_lastr + 1 == lbn && 228 lblktosize(fs, rablock) < ip->i_size) 229 error = breadn(ITOV(ip), lbn, size, &rablock, 230 &size, 1, NOCRED, &bp); 231 else 232 error = bread(ITOV(ip), lbn, size, NOCRED, &bp); 233 ap->a_vp->v_lastr = lbn; 234 n = MIN(n, size - bp->b_resid); 235 if (error) { 236 brelse(bp); 237 return (error); 238 } 239 error = uiomove(bp->b_un.b_addr + on, (int)n, uio); 240 if (n + on == fs->lfs_bsize || uio->uio_offset == ip->i_size) 241 bp->b_flags |= B_AGE; 242 brelse(bp); 243 } while (error == 0 && uio->uio_resid > 0 && n != 0); 244 return (error); 245 } 246 247 /* 248 * Vnode op for writing. 249 */ 250 lfs_write (ap) 251 struct vop_write_args *ap; 252 { 253 USES_VOP_TRUNCATE; 254 USES_VOP_UPDATE; 255 register struct vnode *vp = ap->a_vp; 256 struct proc *p = ap->a_uio->uio_procp; 257 register struct inode *ip = VTOI(vp); 258 register struct lfs *fs; 259 struct buf *bp; 260 daddr_t lbn; 261 off_t osize; 262 int n, on, flags, newblock; 263 int size, resid, error = 0; 264 265 #ifdef VERBOSE 266 printf("lfs_write ino %d\n", ip->i_number); 267 #endif 268 #ifdef DIAGNOSTIC 269 if (ap->a_uio->uio_rw != UIO_WRITE) 270 panic("lfs_write mode"); 271 #endif 272 switch (vp->v_type) { 273 case VREG: 274 if (ap->a_ioflag & IO_APPEND) 275 ap->a_uio->uio_offset = ip->i_size; 276 /* fall through */ 277 case VLNK: 278 break; 279 280 case VDIR: 281 /* XXX This may not be correct for LFS. */ 282 if ((ap->a_ioflag & IO_SYNC) == 0) 283 panic("lfs_write nonsync dir write"); 284 break; 285 286 default: 287 panic("lfs_write type"); 288 } 289 if (ap->a_uio->uio_offset < 0) 290 return (EINVAL); 291 if (ap->a_uio->uio_resid == 0) 292 return (0); 293 /* 294 * Maybe this should be above the vnode op call, but so long as 295 * file servers have no limits, i don't think it matters 296 */ 297 if (vp->v_type == VREG && p && 298 ap->a_uio->uio_offset + ap->a_uio->uio_resid > 299 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 300 psignal(p, SIGXFSZ); 301 return (EFBIG); 302 } 303 resid = ap->a_uio->uio_resid; 304 osize = ip->i_size; 305 fs = ip->i_lfs; /* LFS */ 306 flags = 0; 307 #ifdef NOTLFS 308 if (ap->a_ioflag & IO_SYNC) 309 flags = B_SYNC; 310 #endif 311 do { 312 lbn = lblkno(fs, ap->a_uio->uio_offset); 313 on = blkoff(fs, ap->a_uio->uio_offset); 314 n = MIN((unsigned)(fs->lfs_bsize - on), ap->a_uio->uio_resid); 315 if (error = lfs_balloc(vp, n, lbn, &bp)) 316 break; 317 if (ap->a_uio->uio_offset + n > ip->i_size) { 318 ip->i_size = ap->a_uio->uio_offset + n; 319 vnode_pager_setsize(vp, (u_long)ip->i_size); 320 } 321 size = blksize(fs); 322 (void) vnode_pager_uncache(vp); 323 n = MIN(n, size - bp->b_resid); 324 error = uiomove(bp->b_un.b_addr + on, n, ap->a_uio); 325 #ifdef NOTLFS /* LFS */ 326 if (ap->a_ioflag & IO_SYNC) 327 (void) bwrite(bp); 328 else if (n + on == fs->fs_bsize) { 329 bp->b_flags |= B_AGE; 330 bawrite(bp); 331 } else 332 bdwrite(bp); 333 ip->i_flag |= IUPD|ICHG; 334 #else 335 /* XXX This doesn't handle IO_SYNC. */ 336 LFS_UBWRITE(bp); 337 #endif 338 if (ap->a_cred->cr_uid != 0) 339 ip->i_mode &= ~(ISUID|ISGID); 340 } while (error == 0 && ap->a_uio->uio_resid > 0 && n != 0); 341 if (error && (ap->a_ioflag & IO_UNIT)) { 342 (void)VOP_TRUNCATE(vp, osize, ap->a_ioflag & IO_SYNC, ap->a_cred); 343 ap->a_uio->uio_offset -= resid - ap->a_uio->uio_resid; 344 ap->a_uio->uio_resid = resid; 345 } 346 if (!error && (ap->a_ioflag & IO_SYNC)) 347 error = VOP_UPDATE(vp, &time, &time, 1); 348 return (error); 349 } 350 351 /* 352 * Synch an open file. 353 */ 354 /* ARGSUSED */ 355 lfs_fsync (ap) 356 struct vop_fsync_args *ap; 357 { 358 USES_VOP_UPDATE; 359 struct inode *ip; 360 361 #ifdef VERBOSE 362 printf("lfs_fsync\n"); 363 #endif 364 ip = VTOI(ap->a_vp); 365 if (ap->a_fflags & FWRITE) 366 ip->i_flag |= ICHG; 367 return (VOP_UPDATE(ap->a_vp, &time, &time, ap->a_waitfor == MNT_WAIT)); 368 } 369 370 /* 371 * Last reference to an inode, write the inode out and if necessary, 372 * truncate and deallocate the file. 373 */ 374 int 375 lfs_inactive (ap) 376 struct vop_inactive_args *ap; 377 { 378 USES_VOP_TRUNCATE; 379 USES_VOP_UPDATE; 380 USES_VOP_VFREE; 381 extern int prtactive; 382 register struct inode *ip; 383 int mode, error; 384 385 #ifdef VERBOSE 386 printf("lfs_inactive\n"); 387 #endif 388 if (prtactive && ap->a_vp->v_usecount != 0) 389 vprint("lfs_inactive: pushing active", ap->a_vp); 390 391 /* Get rid of inodes related to stale file handles. */ 392 ip = VTOI(ap->a_vp); 393 if (ip->i_mode == 0) { 394 if ((ap->a_vp->v_flag & VXLOCK) == 0) 395 vgone(ap->a_vp); 396 return (0); 397 } 398 399 error = 0; 400 ILOCK(ip); 401 if (ip->i_nlink <= 0 && (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 402 #ifdef QUOTA 403 if (!getinoquota(ip)) 404 (void)chkiq(ip, -1, NOCRED, 0); 405 #endif 406 error = VOP_TRUNCATE(ap->a_vp, (off_t)0, 0, NOCRED); 407 mode = ip->i_mode; 408 ip->i_mode = 0; 409 ip->i_rdev = 0; 410 ip->i_flag |= IUPD|ICHG; 411 VOP_VFREE(ap->a_vp, ip->i_number, mode); 412 } 413 if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) 414 VOP_UPDATE(ap->a_vp, &time, &time, 0); 415 IUNLOCK(ip); 416 ip->i_flag = 0; 417 /* 418 * If we are done with the inode, reclaim it 419 * so that it can be reused immediately. 420 */ 421 if (ap->a_vp->v_usecount == 0 && ip->i_mode == 0) 422 vgone(ap->a_vp); 423 return (error); 424 } 425