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 7.71 (Berkeley) 03/26/92 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 <ufs/ufs/lockf.h> 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/ffs/fs.h> 32 #include <ufs/ffs/ffs_extern.h> 33 34 /* Global vfs data structures for ufs. */ 35 struct vnodeops ffs_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 ffs_read, /* read */ 45 ffs_write, /* write */ 46 ufs_ioctl, /* ioctl */ 47 ufs_select, /* select */ 48 ufs_mmap, /* mmap */ 49 ffs_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 ffs_inactive, /* inactive */ 61 ufs_reclaim, /* reclaim */ 62 ufs_lock, /* lock */ 63 ufs_unlock, /* unlock */ 64 ffs_bmap, /* bmap */ 65 ufs_strategy, /* strategy */ 66 ufs_print, /* print */ 67 ufs_islocked, /* islocked */ 68 ufs_advlock, /* advlock */ 69 ffs_blkatoff, /* blkatoff */ 70 ffs_vget, /* vget */ 71 ffs_valloc, /* valloc */ 72 ffs_vfree, /* vfree */ 73 ffs_truncate, /* truncate */ 74 ffs_update, /* update */ 75 bwrite, /* bwrite */ 76 }; 77 78 struct vnodeops ffs_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 ffs_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 ffs_update, /* update */ 118 bwrite, /* bwrite */ 119 }; 120 121 #ifdef FIFO 122 struct vnodeops ffs_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 ffs_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 ffs_update, /* update */ 162 bwrite, /* bwrite */ 163 }; 164 #endif /* FIFO */ 165 166 167 /* 168 * Vnode op for reading. 169 */ 170 /* ARGSUSED */ 171 ffs_read(vp, uio, ioflag, cred) 172 struct vnode *vp; 173 register struct uio *uio; 174 int ioflag; 175 struct ucred *cred; 176 { 177 register struct inode *ip = VTOI(vp); 178 register struct fs *fs; 179 struct buf *bp; 180 daddr_t lbn, bn, rablock; 181 off_t diff; 182 int error = 0; 183 long size, rasize, n, on; 184 185 #ifdef DIAGNOSTIC 186 int type; 187 if (uio->uio_rw != UIO_READ) 188 panic("ffs_read mode"); 189 type = ip->i_mode & IFMT; 190 if (type != IFDIR && type != IFREG && type != IFLNK) 191 panic("ffs_read type"); 192 #endif 193 if (uio->uio_resid == 0) 194 return (0); 195 if (uio->uio_offset < 0) 196 return (EINVAL); 197 ip->i_flag |= IACC; 198 fs = ip->i_fs; 199 do { 200 lbn = lblkno(fs, uio->uio_offset); 201 on = blkoff(fs, uio->uio_offset); 202 n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); 203 diff = ip->i_size - uio->uio_offset; 204 if (diff <= 0) 205 return (0); 206 if (diff < n) 207 n = diff; 208 size = blksize(fs, ip, lbn); 209 rablock = lbn + 1; 210 if (vp->v_lastr + 1 == lbn && 211 lblktosize(fs, rablock) < ip->i_size) { 212 rasize = blksize(fs, ip, rablock); 213 error = breadn(vp, lbn, size, &rablock, 214 &rasize, 1, NOCRED, &bp); 215 } else 216 error = bread(vp, lbn, size, NOCRED, &bp); 217 vp->v_lastr = lbn; 218 n = MIN(n, size - bp->b_resid); 219 if (error) { 220 brelse(bp); 221 return (error); 222 } 223 error = uiomove(bp->b_un.b_addr + on, (int)n, uio); 224 if (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size) 225 bp->b_flags |= B_AGE; 226 brelse(bp); 227 } while (error == 0 && uio->uio_resid > 0 && n != 0); 228 return (error); 229 } 230 231 /* 232 * Vnode op for writing. 233 */ 234 ffs_write(vp, uio, ioflag, cred) 235 register struct vnode *vp; 236 struct uio *uio; 237 int ioflag; 238 struct ucred *cred; 239 { 240 struct proc *p = uio->uio_procp; 241 register struct inode *ip = VTOI(vp); 242 register struct fs *fs; 243 struct buf *bp; 244 daddr_t lbn, bn; 245 u_long osize; 246 int n, on, flags; 247 int size, resid, error = 0; 248 249 #ifdef DIAGNOSTIC 250 if (uio->uio_rw != UIO_WRITE) 251 panic("ffs_write mode"); 252 #endif 253 switch (vp->v_type) { 254 case VREG: 255 if (ioflag & IO_APPEND) 256 uio->uio_offset = ip->i_size; 257 /* fall through */ 258 case VLNK: 259 break; 260 261 case VDIR: 262 if ((ioflag & IO_SYNC) == 0) 263 panic("ffs_write nonsync dir write"); 264 break; 265 266 default: 267 panic("ffs_write type"); 268 } 269 if (uio->uio_offset < 0) 270 return (EINVAL); 271 if (uio->uio_resid == 0) 272 return (0); 273 /* 274 * Maybe this should be above the vnode op call, but so long as 275 * file servers have no limits, i don't think it matters 276 */ 277 if (vp->v_type == VREG && p && 278 uio->uio_offset + uio->uio_resid > 279 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 280 psignal(p, SIGXFSZ); 281 return (EFBIG); 282 } 283 resid = uio->uio_resid; 284 osize = ip->i_size; 285 fs = ip->i_fs; 286 flags = 0; 287 if (ioflag & IO_SYNC) 288 flags = B_SYNC; 289 do { 290 lbn = lblkno(fs, uio->uio_offset); 291 on = blkoff(fs, uio->uio_offset); 292 n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid); 293 if (n < fs->fs_bsize) 294 flags |= B_CLRBUF; 295 else 296 flags &= ~B_CLRBUF; 297 if (error = ffs_balloc(ip, lbn, (int)(on + n), &bp, flags)) 298 break; 299 bn = bp->b_blkno; 300 if (uio->uio_offset + n > ip->i_size) { 301 ip->i_size = uio->uio_offset + n; 302 vnode_pager_setsize(vp, (u_long)ip->i_size); 303 } 304 size = blksize(fs, ip, lbn); 305 (void) vnode_pager_uncache(vp); 306 n = MIN(n, size - bp->b_resid); 307 error = uiomove(bp->b_un.b_addr + on, n, uio); 308 if (ioflag & IO_SYNC) 309 (void) bwrite(bp); 310 else if (n + on == fs->fs_bsize) { 311 bp->b_flags |= B_AGE; 312 bawrite(bp); 313 } else 314 bdwrite(bp); 315 ip->i_flag |= IUPD|ICHG; 316 if (cred->cr_uid != 0) 317 ip->i_mode &= ~(ISUID|ISGID); 318 } while (error == 0 && uio->uio_resid > 0 && n != 0); 319 if (error && (ioflag & IO_UNIT)) { 320 (void)ffs_truncate(vp, osize, ioflag & IO_SYNC); 321 uio->uio_offset -= resid - uio->uio_resid; 322 uio->uio_resid = resid; 323 } 324 if (!error && (ioflag & IO_SYNC)) 325 error = ffs_update(vp, &time, &time, 1); 326 return (error); 327 } 328 329 /* 330 * Synch an open file. 331 */ 332 /* ARGSUSED */ 333 int 334 ffs_fsync(vp, fflags, cred, waitfor, p) 335 struct vnode *vp; 336 int fflags; 337 struct ucred *cred; 338 int waitfor; 339 struct proc *p; 340 { 341 struct inode *ip = VTOI(vp); 342 343 if (fflags & FWRITE) 344 ip->i_flag |= ICHG; 345 vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0); 346 return (ffs_update(vp, &time, &time, waitfor == MNT_WAIT)); 347 } 348 349 /* 350 * Last reference to an inode, write the inode out and if necessary, 351 * truncate and deallocate the file. 352 */ 353 int 354 ffs_inactive(vp, p) 355 struct vnode *vp; 356 struct proc *p; 357 { 358 register struct inode *ip; 359 int mode, error; 360 extern int prtactive; 361 362 if (prtactive && vp->v_usecount != 0) 363 vprint("ffs_inactive: pushing active", vp); 364 365 /* Get rid of inodes related to stale file handles. */ 366 ip = VTOI(vp); 367 if (ip->i_mode == 0) { 368 if ((vp->v_flag & VXLOCK) == 0) 369 vgone(vp); 370 return (0); 371 } 372 373 error = 0; 374 ILOCK(ip); 375 if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 376 #ifdef QUOTA 377 if (!getinoquota(ip)) 378 (void)chkiq(ip, -1, NOCRED, 0); 379 #endif 380 error = ffs_truncate(vp, (u_long)0, 0); 381 mode = ip->i_mode; 382 ip->i_mode = 0; 383 ip->i_rdev = 0; 384 ip->i_flag |= IUPD|ICHG; 385 ffs_vfree(vp, ip->i_number, mode); 386 } 387 if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) 388 ffs_update(vp, &time, &time, 0); 389 IUNLOCK(ip); 390 ip->i_flag = 0; 391 /* 392 * If we are done with the inode, reclaim it 393 * so that it can be reused immediately. 394 */ 395 if (vp->v_usecount == 0 && ip->i_mode == 0) 396 vgone(vp); 397 return (error); 398 } 399