| 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 7.76 (Berkeley) %G% |
| 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, 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, spec_vfree }, /* vfree */ |
| 125 | { &vop_truncate_desc, spec_truncate }, /* truncate */ |
| 126 | { &vop_update_desc, ffs_update }, /* update */ |
| 127 | { &vop_bwrite_desc, 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, fifo_vfree }, /* vfree */ |
| 174 | { &vop_truncate_desc, fifo_truncate }, /* truncate */ |
| 175 | { &vop_update_desc, ffs_update }, /* update */ |
| 176 | { &vop_bwrite_desc, 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 | #define vp (ap->a_vp) |
| 191 | #define uio (ap->a_uio) |
| 192 | #define ioflag (ap->a_ioflag) |
| 193 | #define cred (ap->a_cred) |
| 194 | { |
| 195 | register struct inode *ip = VTOI(vp); |
| 196 | register struct fs *fs; |
| 197 | struct buf *bp; |
| 198 | daddr_t lbn, bn, rablock; |
| 199 | off_t diff; |
| 200 | int rasize, error = 0; |
| 201 | long size, n, on; |
| 202 | |
| 203 | #ifdef DIAGNOSTIC |
| 204 | int type; |
| 205 | if (uio->uio_rw != UIO_READ) |
| 206 | panic("ffs_read mode"); |
| 207 | type = ip->i_mode & IFMT; |
| 208 | if (type != IFDIR && type != IFREG && type != IFLNK) |
| 209 | panic("ffs_read type"); |
| 210 | #endif |
| 211 | if (uio->uio_resid == 0) |
| 212 | return (0); |
| 213 | if (uio->uio_offset < 0) |
| 214 | return (EINVAL); |
| 215 | ip->i_flag |= IACC; |
| 216 | fs = ip->i_fs; |
| 217 | do { |
| 218 | lbn = lblkno(fs, uio->uio_offset); |
| 219 | on = blkoff(fs, uio->uio_offset); |
| 220 | n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); |
| 221 | diff = ip->i_size - uio->uio_offset; |
| 222 | if (diff <= 0) |
| 223 | return (0); |
| 224 | if (diff < n) |
| 225 | n = diff; |
| 226 | size = blksize(fs, ip, lbn); |
| 227 | rablock = lbn + 1; |
| 228 | if (vp->v_lastr + 1 == lbn && |
| 229 | lblktosize(fs, rablock) < ip->i_size) { |
| 230 | rasize = blksize(fs, ip, rablock); |
| 231 | error = breadn(vp, lbn, size, &rablock, |
| 232 | &rasize, 1, NOCRED, &bp); |
| 233 | } else |
| 234 | error = bread(vp, lbn, size, NOCRED, &bp); |
| 235 | vp->v_lastr = lbn; |
| 236 | n = MIN(n, size - bp->b_resid); |
| 237 | if (error) { |
| 238 | brelse(bp); |
| 239 | return (error); |
| 240 | } |
| 241 | error = uiomove(bp->b_un.b_addr + on, (int)n, uio); |
| 242 | if (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size) |
| 243 | bp->b_flags |= B_AGE; |
| 244 | brelse(bp); |
| 245 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
| 246 | return (error); |
| 247 | } |
| 248 | #undef vp |
| 249 | #undef uio |
| 250 | #undef ioflag |
| 251 | #undef cred |
| 252 | |
| 253 | /* |
| 254 | * Vnode op for writing. |
| 255 | */ |
| 256 | ffs_write (ap) |
| 257 | struct vop_write_args *ap; |
| 258 | #define vp (ap->a_vp) |
| 259 | #define uio (ap->a_uio) |
| 260 | #define ioflag (ap->a_ioflag) |
| 261 | #define cred (ap->a_cred) |
| 262 | { |
| 263 | USES_VOP_TRUNCATE; |
| 264 | USES_VOP_UPDATE; |
| 265 | struct proc *p = uio->uio_procp; |
| 266 | register struct inode *ip = VTOI(vp); |
| 267 | register struct fs *fs; |
| 268 | struct buf *bp; |
| 269 | daddr_t lbn, bn; |
| 270 | off_t osize; |
| 271 | int n, on, flags; |
| 272 | int size, resid, error = 0; |
| 273 | |
| 274 | #ifdef DIAGNOSTIC |
| 275 | if (uio->uio_rw != UIO_WRITE) |
| 276 | panic("ffs_write mode"); |
| 277 | #endif |
| 278 | switch (vp->v_type) { |
| 279 | case VREG: |
| 280 | if (ioflag & IO_APPEND) |
| 281 | uio->uio_offset = ip->i_size; |
| 282 | /* fall through */ |
| 283 | case VLNK: |
| 284 | break; |
| 285 | |
| 286 | case VDIR: |
| 287 | if ((ioflag & IO_SYNC) == 0) |
| 288 | panic("ffs_write nonsync dir write"); |
| 289 | break; |
| 290 | |
| 291 | default: |
| 292 | panic("ffs_write type"); |
| 293 | } |
| 294 | if (uio->uio_offset < 0) |
| 295 | return (EINVAL); |
| 296 | if (uio->uio_resid == 0) |
| 297 | return (0); |
| 298 | /* |
| 299 | * Maybe this should be above the vnode op call, but so long as |
| 300 | * file servers have no limits, i don't think it matters |
| 301 | */ |
| 302 | if (vp->v_type == VREG && p && |
| 303 | uio->uio_offset + uio->uio_resid > |
| 304 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { |
| 305 | psignal(p, SIGXFSZ); |
| 306 | return (EFBIG); |
| 307 | } |
| 308 | resid = uio->uio_resid; |
| 309 | osize = ip->i_size; |
| 310 | fs = ip->i_fs; |
| 311 | flags = 0; |
| 312 | if (ioflag & IO_SYNC) |
| 313 | flags = B_SYNC; |
| 314 | do { |
| 315 | lbn = lblkno(fs, uio->uio_offset); |
| 316 | on = blkoff(fs, uio->uio_offset); |
| 317 | n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); |
| 318 | if (n < fs->fs_bsize) |
| 319 | flags |= B_CLRBUF; |
| 320 | else |
| 321 | flags &= ~B_CLRBUF; |
| 322 | if (error = ffs_balloc(ip, lbn, on + n, cred, &bp, flags)) |
| 323 | break; |
| 324 | bn = bp->b_blkno; |
| 325 | if (uio->uio_offset + n > ip->i_size) { |
| 326 | ip->i_size = uio->uio_offset + n; |
| 327 | vnode_pager_setsize(vp, (u_long)ip->i_size); |
| 328 | } |
| 329 | size = blksize(fs, ip, lbn); |
| 330 | (void) vnode_pager_uncache(vp); |
| 331 | n = MIN(n, size - bp->b_resid); |
| 332 | error = uiomove(bp->b_un.b_addr + on, n, uio); |
| 333 | if (ioflag & IO_SYNC) |
| 334 | (void) bwrite(bp); |
| 335 | else if (n + on == fs->fs_bsize) { |
| 336 | bp->b_flags |= B_AGE; |
| 337 | bawrite(bp); |
| 338 | } else |
| 339 | bdwrite(bp); |
| 340 | ip->i_flag |= IUPD|ICHG; |
| 341 | if (cred->cr_uid != 0) |
| 342 | ip->i_mode &= ~(ISUID|ISGID); |
| 343 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
| 344 | if (error && (ioflag & IO_UNIT)) { |
| 345 | (void)VOP_TRUNCATE(vp, osize, ioflag & IO_SYNC, cred); |
| 346 | uio->uio_offset -= resid - uio->uio_resid; |
| 347 | uio->uio_resid = resid; |
| 348 | } |
| 349 | if (!error && (ioflag & IO_SYNC)) |
| 350 | error = VOP_UPDATE(vp, &time, &time, 1); |
| 351 | return (error); |
| 352 | } |
| 353 | #undef vp |
| 354 | #undef uio |
| 355 | #undef ioflag |
| 356 | #undef cred |
| 357 | |
| 358 | /* |
| 359 | * Synch an open file. |
| 360 | */ |
| 361 | /* ARGSUSED */ |
| 362 | int |
| 363 | ffs_fsync (ap) |
| 364 | struct vop_fsync_args *ap; |
| 365 | #define vp (ap->a_vp) |
| 366 | #define fflags (ap->a_fflags) |
| 367 | #define cred (ap->a_cred) |
| 368 | #define waitfor (ap->a_waitfor) |
| 369 | #define p (ap->a_p) |
| 370 | { |
| 371 | USES_VOP_UPDATE; |
| 372 | struct inode *ip = VTOI(vp); |
| 373 | |
| 374 | if (fflags & FWRITE) |
| 375 | ip->i_flag |= ICHG; |
| 376 | vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0); |
| 377 | return (VOP_UPDATE(vp, &time, &time, waitfor == MNT_WAIT)); |
| 378 | } |
| 379 | #undef vp |
| 380 | #undef fflags |
| 381 | #undef cred |
| 382 | #undef waitfor |
| 383 | #undef p |
| 384 | |
| 385 | /* |
| 386 | * Last reference to an inode, write the inode out and if necessary, |
| 387 | * truncate and deallocate the file. |
| 388 | */ |
| 389 | int |
| 390 | ffs_inactive (ap) |
| 391 | struct vop_inactive_args *ap; |
| 392 | #define vp (ap->a_vp) |
| 393 | #define p (ap->a_p) |
| 394 | { |
| 395 | USES_VOP_TRUNCATE; |
| 396 | USES_VOP_UPDATE; |
| 397 | USES_VOP_VFREE; |
| 398 | register struct inode *ip; |
| 399 | int mode, error; |
| 400 | extern int prtactive; |
| 401 | |
| 402 | if (prtactive && vp->v_usecount != 0) |
| 403 | vprint("ffs_inactive: pushing active", vp); |
| 404 | |
| 405 | /* Get rid of inodes related to stale file handles. */ |
| 406 | ip = VTOI(vp); |
| 407 | if (ip->i_mode == 0) { |
| 408 | if ((vp->v_flag & VXLOCK) == 0) |
| 409 | vgone(vp); |
| 410 | return (0); |
| 411 | } |
| 412 | |
| 413 | error = 0; |
| 414 | ILOCK(ip); |
| 415 | if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { |
| 416 | #ifdef QUOTA |
| 417 | if (!getinoquota(ip)) |
| 418 | (void)chkiq(ip, -1, NOCRED, 0); |
| 419 | #endif |
| 420 | error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED); |
| 421 | mode = ip->i_mode; |
| 422 | ip->i_mode = 0; |
| 423 | ip->i_rdev = 0; |
| 424 | ip->i_flag |= IUPD|ICHG; |
| 425 | VOP_VFREE(vp, ip->i_number, mode); |
| 426 | } |
| 427 | if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) |
| 428 | VOP_UPDATE(vp, &time, &time, 0); |
| 429 | IUNLOCK(ip); |
| 430 | ip->i_flag = 0; |
| 431 | /* |
| 432 | * If we are done with the inode, reclaim it |
| 433 | * so that it can be reused immediately. |
| 434 | */ |
| 435 | if (vp->v_usecount == 0 && ip->i_mode == 0) |
| 436 | vgone(vp); |
| 437 | return (error); |
| 438 | } |
| 439 | #undef vp |
| 440 | #undef p |