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 7.83 (Berkeley) 06/17/92 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/specdev.h> 22 #include <sys/fifo.h> 23 #include <sys/malloc.h> 24 25 #include <vm/vm.h> 26 27 #include <ufs/ufs/lockf.h> 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/ffs/fs.h> 34 #include <ufs/ffs/ffs_extern.h> 35 36 /* Global vfs data structures for ufs. */ 37 int (**ffs_vnodeop_p)(); 38 struct vnodeopv_entry_desc ffs_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, ffs_read }, /* read */ 49 { &vop_write_desc, ffs_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, ffs_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, ffs_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, ffs_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, ffs_blkatoff }, /* blkatoff */ 74 { &vop_vget_desc, ffs_vget }, /* vget */ 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, 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, ffs_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, ffs_vfree }, /* vfree */ 125 { &vop_truncate_desc, spec_truncate }, /* truncate */ 126 { &vop_update_desc, ffs_update }, /* update */ 127 { &vop_bwrite_desc, vn_bwrite }, 128 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 129 }; 130 struct vnodeopv_desc ffs_specop_opv_desc = 131 { &ffs_specop_p, ffs_specop_entries }; 132 133 #ifdef FIFO 134 int (**ffs_fifoop_p)(); 135 struct vnodeopv_entry_desc ffs_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, ffs_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, ffs_vfree }, /* vfree */ 174 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 175 { &vop_update_desc, ffs_update }, /* update */ 176 { &vop_bwrite_desc, vn_bwrite }, 177 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 178 }; 179 struct vnodeopv_desc ffs_fifoop_opv_desc = 180 { &ffs_fifoop_p, ffs_fifoop_entries }; 181 #endif /* FIFO */ 182 183 184 /* 185 * Vnode op for reading. 186 */ 187 /* ARGSUSED */ 188 ffs_read(ap) 189 struct vop_read_args *ap; 190 { 191 register struct vnode *vp = ap->a_vp; 192 register struct inode *ip = VTOI(vp); 193 register struct uio *uio = ap->a_uio; 194 register struct fs *fs; 195 struct buf *bp; 196 daddr_t lbn, bn, rablock; 197 off_t diff; 198 int rasize, error = 0; 199 long size, n, on; 200 201 #ifdef DIAGNOSTIC 202 int type; 203 if (uio->uio_rw != UIO_READ) 204 panic("ffs_read mode"); 205 type = ip->i_mode & IFMT; 206 if (type != IFDIR && type != IFREG && type != IFLNK) 207 panic("ffs_read type"); 208 #endif 209 if (uio->uio_resid == 0) 210 return (0); 211 fs = ip->i_fs; 212 if (uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 213 return (EFBIG); 214 ip->i_flag |= IACC; 215 do { 216 lbn = lblkno(fs, uio->uio_offset); 217 on = blkoff(fs, uio->uio_offset); 218 n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); 219 diff = ip->i_size - uio->uio_offset; 220 if (diff <= 0) 221 return (0); 222 if (diff < n) 223 n = diff; 224 size = blksize(fs, ip, lbn); 225 rablock = lbn + 1; 226 if (vp->v_lastr + 1 == lbn && 227 lblktosize(fs, rablock) < ip->i_size) { 228 rasize = blksize(fs, ip, rablock); 229 error = breadn(vp, lbn, size, &rablock, 230 &rasize, 1, NOCRED, &bp); 231 } else 232 error = bread(vp, lbn, size, NOCRED, &bp); 233 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->fs_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 ffs_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 register struct uio *uio = ap->a_uio; 257 register struct inode *ip = VTOI(vp); 258 register struct fs *fs; 259 struct proc *p = uio->uio_procp; 260 int ioflag = ap->a_ioflag; 261 struct buf *bp; 262 daddr_t lbn, bn; 263 off_t osize; 264 int n, on, flags; 265 int size, resid, error = 0; 266 267 #ifdef DIAGNOSTIC 268 if (uio->uio_rw != UIO_WRITE) 269 panic("ffs_write mode"); 270 #endif 271 switch (vp->v_type) { 272 case VREG: 273 if (ioflag & IO_APPEND) 274 uio->uio_offset = ip->i_size; 275 /* fall through */ 276 case VLNK: 277 break; 278 279 case VDIR: 280 if ((ioflag & IO_SYNC) == 0) 281 panic("ffs_write nonsync dir write"); 282 break; 283 284 default: 285 panic("ffs_write type"); 286 } 287 if (uio->uio_resid == 0) 288 return (0); 289 fs = ip->i_fs; 290 if (uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 291 return (EFBIG); 292 /* 293 * Maybe this should be above the vnode op call, but so long as 294 * file servers have no limits, i don't think it matters 295 */ 296 if (vp->v_type == VREG && p && 297 uio->uio_offset + uio->uio_resid > 298 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 299 psignal(p, SIGXFSZ); 300 return (EFBIG); 301 } 302 resid = uio->uio_resid; 303 osize = ip->i_size; 304 flags = 0; 305 if (ioflag & IO_SYNC) 306 flags = B_SYNC; 307 do { 308 lbn = lblkno(fs, uio->uio_offset); 309 on = blkoff(fs, uio->uio_offset); 310 n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); 311 if (n < fs->fs_bsize) 312 flags |= B_CLRBUF; 313 else 314 flags &= ~B_CLRBUF; 315 if (error = ffs_balloc(ip, lbn, on + n, ap->a_cred, &bp, flags)) 316 break; 317 bn = bp->b_blkno; 318 if (uio->uio_offset + n > ip->i_size) { 319 ip->i_size = uio->uio_offset + n; 320 vnode_pager_setsize(vp, (u_long)ip->i_size); 321 } 322 size = blksize(fs, ip, lbn); 323 (void) vnode_pager_uncache(vp); 324 n = MIN(n, size - bp->b_resid); 325 error = uiomove(bp->b_un.b_addr + on, n, uio); 326 if (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 if (ap->a_cred->cr_uid != 0) 335 ip->i_mode &= ~(ISUID|ISGID); 336 } while (error == 0 && uio->uio_resid > 0 && n != 0); 337 if (error && (ioflag & IO_UNIT)) { 338 (void)VOP_TRUNCATE(vp, osize, ioflag & IO_SYNC, ap->a_cred); 339 uio->uio_offset -= resid - uio->uio_resid; 340 uio->uio_resid = resid; 341 } 342 if (!error && (ioflag & IO_SYNC)) 343 error = VOP_UPDATE(vp, &time, &time, 1); 344 return (error); 345 } 346 347 /* 348 * Synch an open file. 349 */ 350 /* ARGSUSED */ 351 int 352 ffs_fsync(ap) 353 struct vop_fsync_args *ap; 354 { 355 USES_VOP_UPDATE; 356 struct inode *ip = VTOI(ap->a_vp); 357 358 if (ap->a_fflags & FWRITE) 359 ip->i_flag |= ICHG; 360 vflushbuf(ap->a_vp, ap->a_waitfor == MNT_WAIT ? B_SYNC : 0); 361 return (VOP_UPDATE(ap->a_vp, &time, &time, ap->a_waitfor == MNT_WAIT)); 362 } 363 364 /* 365 * Last reference to an inode, write the inode out and if necessary, 366 * truncate and deallocate the file. 367 */ 368 int 369 ffs_inactive(ap) 370 struct vop_inactive_args *ap; 371 { 372 USES_VOP_TRUNCATE; 373 USES_VOP_UPDATE; 374 USES_VOP_VFREE; 375 register struct vnode *vp = ap->a_vp; 376 register struct inode *ip = VTOI(vp); 377 int mode, error; 378 extern int prtactive; 379 380 if (prtactive && vp->v_usecount != 0) 381 vprint("ffs_inactive: pushing active", vp); 382 383 /* Get rid of inodes related to stale file handles. */ 384 if (ip->i_mode == 0) { 385 if ((vp->v_flag & VXLOCK) == 0) 386 vgone(vp); 387 return (0); 388 } 389 390 error = 0; 391 ILOCK(ip); 392 if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 393 #ifdef QUOTA 394 if (!getinoquota(ip)) 395 (void)chkiq(ip, -1, NOCRED, 0); 396 #endif 397 error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED); 398 mode = ip->i_mode; 399 ip->i_mode = 0; 400 ip->i_rdev = 0; 401 ip->i_flag |= IUPD|ICHG; 402 VOP_VFREE(vp, ip->i_number, mode); 403 } 404 if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) 405 VOP_UPDATE(vp, &time, &time, 0); 406 IUNLOCK(ip); 407 ip->i_flag = 0; 408 /* 409 * If we are done with the inode, reclaim it 410 * so that it can be reused immediately. 411 */ 412 if (vp->v_usecount == 0 && ip->i_mode == 0) 413 vgone(vp); 414 return (error); 415 } 416