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1.1 ! root 1: /* ! 2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. ! 3: * ! 4: * @APPLE_LICENSE_HEADER_START@ ! 5: * ! 6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights ! 7: * Reserved. This file contains Original Code and/or Modifications of ! 8: * Original Code as defined in and that are subject to the Apple Public ! 9: * Source License Version 1.1 (the "License"). You may not use this file ! 10: * except in compliance with the License. Please obtain a copy of the ! 11: * License at http://www.apple.com/publicsource and read it before using ! 12: * this file. ! 13: * ! 14: * The Original Code and all software distributed under the License are ! 15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER ! 16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, ! 17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, ! 18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the ! 19: * License for the specific language governing rights and limitations ! 20: * under the License. ! 21: * ! 22: * @APPLE_LICENSE_HEADER_END@ ! 23: */ ! 24: ! 25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ ! 26: /* ! 27: * Copyright (c) 1982, 1986, 1989, 1993 ! 28: * The Regents of the University of California. All rights reserved. ! 29: * (c) UNIX System Laboratories, Inc. ! 30: * All or some portions of this file are derived from material licensed ! 31: * to the University of California by American Telephone and Telegraph ! 32: * Co. or Unix System Laboratories, Inc. and are reproduced herein with ! 33: * the permission of UNIX System Laboratories, Inc. ! 34: * ! 35: * Redistribution and use in source and binary forms, with or without ! 36: * modification, are permitted provided that the following conditions ! 37: * are met: ! 38: * 1. Redistributions of source code must retain the above copyright ! 39: * notice, this list of conditions and the following disclaimer. ! 40: * 2. Redistributions in binary form must reproduce the above copyright ! 41: * notice, this list of conditions and the following disclaimer in the ! 42: * documentation and/or other materials provided with the distribution. ! 43: * 3. All advertising materials mentioning features or use of this software ! 44: * must display the following acknowledgement: ! 45: * This product includes software developed by the University of ! 46: * California, Berkeley and its contributors. ! 47: * 4. Neither the name of the University nor the names of its contributors ! 48: * may be used to endorse or promote products derived from this software ! 49: * without specific prior written permission. ! 50: * ! 51: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ! 52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ! 53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ! 54: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE ! 55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ! 56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ! 57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ! 58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ! 59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ! 60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ! 61: * SUCH DAMAGE. ! 62: * ! 63: * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 ! 64: * ! 65: * History ! 66: * 10-20-1997 Umesh Vaishampayan ! 67: * Fixed the count to be off_t rather than int. ! 68: */ ! 69: ! 70: #include <mach_nbc.h> ! 71: #include <sys/param.h> ! 72: #include <sys/systm.h> ! 73: #include <sys/kernel.h> ! 74: #include <sys/file.h> ! 75: #include <sys/stat.h> ! 76: #include <sys/buf.h> ! 77: #include <sys/proc.h> ! 78: #include <sys/mount.h> ! 79: #include <sys/namei.h> ! 80: #include <sys/vnode.h> ! 81: #include <sys/ioctl.h> ! 82: #include <sys/tty.h> ! 83: #include <kern/mapfs.h> ! 84: ! 85: struct fileops vnops = ! 86: { vn_read, vn_write, vn_ioctl, vn_select, vn_closefile }; ! 87: ! 88: /* ! 89: * Common code for vnode open operations. ! 90: * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. ! 91: */ ! 92: vn_open(ndp, fmode, cmode) ! 93: register struct nameidata *ndp; ! 94: int fmode, cmode; ! 95: { ! 96: register struct vnode *vp; ! 97: register struct proc *p = ndp->ni_cnd.cn_proc; ! 98: register struct ucred *cred = p->p_ucred; ! 99: struct vattr vat; ! 100: struct vattr *vap = &vat; ! 101: int error; ! 102: #if MACH_NBC ! 103: int no_mfs = fmode & O_NO_MFS; ! 104: #endif /* MACH_NBC */ ! 105: ! 106: if (fmode & O_CREAT) { ! 107: ndp->ni_cnd.cn_nameiop = CREATE; ! 108: ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF; ! 109: if ((fmode & O_EXCL) == 0) ! 110: ndp->ni_cnd.cn_flags |= FOLLOW; ! 111: if (error = namei(ndp)) ! 112: return (error); ! 113: if (ndp->ni_vp == NULL) { ! 114: VATTR_NULL(vap); ! 115: vap->va_type = VREG; ! 116: vap->va_mode = cmode; ! 117: if (fmode & O_EXCL) ! 118: vap->va_vaflags |= VA_EXCLUSIVE; ! 119: VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE); ! 120: if (error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, ! 121: &ndp->ni_cnd, vap)) ! 122: return (error); ! 123: fmode &= ~O_TRUNC; ! 124: vp = ndp->ni_vp; ! 125: } else { ! 126: VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); ! 127: if (ndp->ni_dvp == ndp->ni_vp) ! 128: vrele(ndp->ni_dvp); ! 129: else ! 130: vput(ndp->ni_dvp); ! 131: ndp->ni_dvp = NULL; ! 132: vp = ndp->ni_vp; ! 133: if (fmode & O_EXCL) { ! 134: error = EEXIST; ! 135: goto bad; ! 136: } ! 137: fmode &= ~O_CREAT; ! 138: } ! 139: } else { ! 140: ndp->ni_cnd.cn_nameiop = LOOKUP; ! 141: ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF; ! 142: if (error = namei(ndp)) ! 143: return (error); ! 144: vp = ndp->ni_vp; ! 145: } ! 146: if (vp->v_type == VSOCK) { ! 147: error = EOPNOTSUPP; ! 148: goto bad; ! 149: } ! 150: if ((fmode & O_CREAT) == 0) { ! 151: if (fmode & FREAD) { ! 152: if (error = VOP_ACCESS(vp, VREAD, cred, p)) ! 153: goto bad; ! 154: } ! 155: if (fmode & (FWRITE | O_TRUNC)) { ! 156: if (vp->v_type == VDIR) { ! 157: error = EISDIR; ! 158: goto bad; ! 159: } ! 160: if ((error = vn_writechk(vp)) || ! 161: (error = VOP_ACCESS(vp, VWRITE, cred, p))) ! 162: goto bad; ! 163: } ! 164: } ! 165: if (fmode & O_TRUNC) { ! 166: VOP_UNLOCK(vp, 0, p); /* XXX */ ! 167: VOP_LEASE(vp, p, cred, LEASE_WRITE); ! 168: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* XXX */ ! 169: VATTR_NULL(vap); ! 170: vap->va_size = 0; ! 171: if (error = VOP_SETATTR(vp, vap, cred, p)) ! 172: goto bad; ! 173: } ! 174: if (error = VOP_OPEN(vp, fmode, cred, p)) ! 175: goto bad; ! 176: if ((vp->v_type == VREG) && !vp->v_vm_info) // XXX WMG ! 177: vm_info_init(vp); ! 178: #if MACH_NBC ! 179: if ((error == 0) && (no_mfs == 0) && (vp->v_type == VREG)) { ! 180: /* if the file was never mapped, leave it alone */ ! 181: if (vp->v_vm_info->pager != NULL) ! 182: map_vnode(vp,p); ! 183: } ! 184: ! 185: /* ! 186: * if O_NO_MFS is set on open, blow the VM cache. ! 187: * if someone else is using it in VM then this has no effect. ! 188: */ ! 189: if ((vp->v_type == VREG) && (no_mfs != 0)) ! 190: (void) vnode_uncache(vp); ! 191: #endif /* MACH_NBC */ ! 192: ! 193: if (fmode & FWRITE) ! 194: vp->v_writecount++; ! 195: return (0); ! 196: bad: ! 197: vput(vp); ! 198: return (error); ! 199: } ! 200: ! 201: /* ! 202: * Check for write permissions on the specified vnode. ! 203: * Prototype text segments cannot be written. ! 204: */ ! 205: vn_writechk(vp) ! 206: register struct vnode *vp; ! 207: { ! 208: ! 209: /* ! 210: * If there's shared text associated with ! 211: * the vnode, try to free it up once. If ! 212: * we fail, we can't allow writing. ! 213: */ ! 214: if ((vp->v_flag & VTEXT) && !vnode_uncache(vp)) ! 215: return (ETXTBSY); ! 216: return (0); ! 217: } ! 218: ! 219: /* ! 220: * Vnode close call ! 221: */ ! 222: vn_close(vp, flags, cred, p) ! 223: register struct vnode *vp; ! 224: int flags; ! 225: struct ucred *cred; ! 226: struct proc *p; ! 227: { ! 228: int error; ! 229: ! 230: #if MACH_NBC ! 231: if ((vp->v_type == VREG) && vp->v_vm_info) ! 232: unmap_vnode(vp,p); ! 233: #endif /* MACH_NBC */ ! 234: ! 235: if (flags & FWRITE) ! 236: vp->v_writecount--; ! 237: error = VOP_CLOSE(vp, flags, cred, p); ! 238: vrele(vp); ! 239: return (error); ! 240: } ! 241: ! 242: /* ! 243: * Package up an I/O request on a vnode into a uio and do it. ! 244: */ ! 245: vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) ! 246: enum uio_rw rw; ! 247: struct vnode *vp; ! 248: caddr_t base; ! 249: int len; ! 250: off_t offset; ! 251: enum uio_seg segflg; ! 252: int ioflg; ! 253: struct ucred *cred; ! 254: int *aresid; ! 255: struct proc *p; ! 256: { ! 257: struct uio auio; ! 258: struct iovec aiov; ! 259: int error=0; ! 260: ! 261: /* The routines that use this under MACH_NBC, call this ! 262: * routine with IO_NODELOCKED on, which is incorrect. ! 263: * For ease of code usage in case MACH_NBC is turned off ! 264: * we will bypass this check and let the callers still use ! 265: * IO_NODELOCKED flag ! 266: */ ! 267: /* FIXME XXX */ ! 268: if ((ioflg & IO_NODELOCKED) == 0) ! 269: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); ! 270: auio.uio_iov = &aiov; ! 271: auio.uio_iovcnt = 1; ! 272: aiov.iov_base = base; ! 273: aiov.iov_len = len; ! 274: auio.uio_resid = len; ! 275: auio.uio_offset = offset; ! 276: auio.uio_segflg = segflg; ! 277: auio.uio_rw = rw; ! 278: auio.uio_procp = p; ! 279: #if MACH_NBC ! 280: /* if the file was never mapped, leave it alone */ ! 281: if ((vp->v_type == VREG) && (vp->v_vm_info->pager != NULL)) { ! 282: if (vp->v_vm_info->map_count == 0) { ! 283: /* ! 284: * file has a pager but MapFS is not involved yet ! 285: * get MapFS involved ! 286: */ ! 287: map_vnode(vp,p); /* vn_close() will loose this map_count */ ! 288: } ! 289: error = mapfs_io(vp, &auio, rw, ioflg, cred); ! 290: } else { ! 291: #endif /* MACH_NBC */ ! 292: if (rw == UIO_READ) ! 293: error = VOP_READ(vp, &auio, ioflg, cred); ! 294: else ! 295: error = VOP_WRITE(vp, &auio, ioflg, cred); ! 296: #if MACH_NBC ! 297: } ! 298: #endif /* MACH_NBC */ ! 299: if (aresid) ! 300: *aresid = auio.uio_resid; ! 301: else ! 302: if (auio.uio_resid && error == 0) ! 303: error = EIO; ! 304: if ((ioflg & IO_NODELOCKED) == 0) ! 305: VOP_UNLOCK(vp, 0, p); ! 306: return (error); ! 307: } ! 308: ! 309: /* ! 310: * File table vnode read routine. ! 311: */ ! 312: vn_read(fp, uio, cred) ! 313: struct file *fp; ! 314: struct uio *uio; ! 315: struct ucred *cred; ! 316: { ! 317: struct vnode *vp = (struct vnode *)fp->f_data; ! 318: struct proc *p = uio->uio_procp; ! 319: int error; ! 320: off_t count; ! 321: ! 322: VOP_LEASE(vp, p, cred, LEASE_READ); ! 323: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); ! 324: uio->uio_offset = fp->f_offset; ! 325: count = uio->uio_resid; ! 326: #if MACH_NBC ! 327: if ((vp->v_type == VREG) && (vp->v_vm_info) && (vp->v_vm_info->mapped)) { ! 328: error = mapfs_io(vp, uio, UIO_READ, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, cred); ! 329: } else { ! 330: #endif /* MACH_NBC */ ! 331: error = VOP_READ(vp, uio, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, cred); ! 332: #if MACH_NBC ! 333: } ! 334: #endif /* MACH_NBC */ ! 335: ! 336: fp->f_offset += count - uio->uio_resid; ! 337: VOP_UNLOCK(vp, 0, p); ! 338: return (error); ! 339: } ! 340: ! 341: /* ! 342: * File table vnode write routine. ! 343: */ ! 344: vn_write(fp, uio, cred) ! 345: struct file *fp; ! 346: struct uio *uio; ! 347: struct ucred *cred; ! 348: { ! 349: struct vnode *vp = (struct vnode *)fp->f_data; ! 350: struct proc *p = uio->uio_procp; ! 351: int error, ioflag = IO_UNIT; ! 352: off_t count; ! 353: ! 354: if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) ! 355: ioflag |= IO_APPEND; ! 356: if (fp->f_flag & FNONBLOCK) ! 357: ioflag |= IO_NDELAY; ! 358: if ((fp->f_flag & O_FSYNC) || ! 359: (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) ! 360: ioflag |= IO_SYNC; ! 361: VOP_LEASE(vp, p, cred, LEASE_WRITE); ! 362: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); ! 363: uio->uio_offset = fp->f_offset; ! 364: count = uio->uio_resid; ! 365: #if MACH_NBC ! 366: if ((vp->v_type == VREG) && (vp->v_vm_info) && (vp->v_vm_info->mapped)) { ! 367: error = mapfs_io(vp, uio, UIO_WRITE, ioflag, cred); ! 368: } else { ! 369: #endif /* MACH_NBC */ ! 370: ! 371: error = VOP_WRITE(vp, uio, ioflag, cred); ! 372: #if MACH_NBC ! 373: } ! 374: #endif /* MACH_NBC */ ! 375: ! 376: if (ioflag & IO_APPEND) ! 377: fp->f_offset = uio->uio_offset; ! 378: else ! 379: fp->f_offset += count - uio->uio_resid; ! 380: VOP_UNLOCK(vp, 0, p); ! 381: return (error); ! 382: } ! 383: ! 384: /* ! 385: * File table vnode stat routine. ! 386: */ ! 387: vn_stat(vp, sb, p) ! 388: struct vnode *vp; ! 389: register struct stat *sb; ! 390: struct proc *p; ! 391: { ! 392: struct vattr vattr; ! 393: register struct vattr *vap; ! 394: int error; ! 395: u_short mode; ! 396: ! 397: vap = &vattr; ! 398: error = VOP_GETATTR(vp, vap, p->p_ucred, p); ! 399: if (error) ! 400: return (error); ! 401: /* ! 402: * Copy from vattr table ! 403: */ ! 404: sb->st_dev = vap->va_fsid; ! 405: sb->st_ino = vap->va_fileid; ! 406: mode = vap->va_mode; ! 407: switch (vp->v_type) { ! 408: case VREG: ! 409: mode |= S_IFREG; ! 410: break; ! 411: case VDIR: ! 412: mode |= S_IFDIR; ! 413: break; ! 414: case VBLK: ! 415: mode |= S_IFBLK; ! 416: break; ! 417: case VCHR: ! 418: mode |= S_IFCHR; ! 419: break; ! 420: case VLNK: ! 421: mode |= S_IFLNK; ! 422: break; ! 423: case VSOCK: ! 424: mode |= S_IFSOCK; ! 425: break; ! 426: case VFIFO: ! 427: mode |= S_IFIFO; ! 428: break; ! 429: default: ! 430: return (EBADF); ! 431: }; ! 432: sb->st_mode = mode; ! 433: sb->st_nlink = vap->va_nlink; ! 434: sb->st_uid = vap->va_uid; ! 435: sb->st_gid = vap->va_gid; ! 436: sb->st_rdev = vap->va_rdev; ! 437: sb->st_size = vap->va_size; ! 438: sb->st_atimespec = vap->va_atime; ! 439: sb->st_mtimespec = vap->va_mtime; ! 440: sb->st_ctimespec = vap->va_ctime; ! 441: sb->st_blksize = vap->va_blocksize; ! 442: sb->st_flags = vap->va_flags; ! 443: /* Do not give the generation number out to unpriviledged users */ ! 444: if (suser(p->p_ucred, &p->p_acflag)) ! 445: sb->st_gen = 0; ! 446: else ! 447: sb->st_gen = vap->va_gen; ! 448: sb->st_blocks = vap->va_bytes / S_BLKSIZE; ! 449: return (0); ! 450: } ! 451: ! 452: /* ! 453: * File table vnode ioctl routine. ! 454: */ ! 455: vn_ioctl(fp, com, data, p) ! 456: struct file *fp; ! 457: u_long com; ! 458: caddr_t data; ! 459: struct proc *p; ! 460: { ! 461: register struct vnode *vp = ((struct vnode *)fp->f_data); ! 462: struct vattr vattr; ! 463: int error; ! 464: ! 465: switch (vp->v_type) { ! 466: ! 467: case VREG: ! 468: case VDIR: ! 469: if (com == FIONREAD) { ! 470: if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) ! 471: return (error); ! 472: *(int *)data = vattr.va_size - fp->f_offset; ! 473: return (0); ! 474: } ! 475: if (com == FIONBIO || com == FIOASYNC) /* XXX */ ! 476: return (0); /* XXX */ ! 477: /* fall into ... */ ! 478: ! 479: default: ! 480: return (ENOTTY); ! 481: ! 482: case VFIFO: ! 483: case VCHR: ! 484: case VBLK: ! 485: error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); ! 486: if (error == 0 && com == TIOCSCTTY) { ! 487: if (p->p_session->s_ttyvp) ! 488: vrele(p->p_session->s_ttyvp); ! 489: p->p_session->s_ttyvp = vp; ! 490: VREF(vp); ! 491: } ! 492: return (error); ! 493: } ! 494: } ! 495: ! 496: /* ! 497: * File table vnode select routine. ! 498: */ ! 499: vn_select(fp, which, p) ! 500: struct file *fp; ! 501: int which; ! 502: struct proc *p; ! 503: { ! 504: ! 505: return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag, ! 506: fp->f_cred, p)); ! 507: } ! 508: ! 509: /* ! 510: * Check that the vnode is still valid, and if so ! 511: * acquire requested lock. ! 512: */ ! 513: int ! 514: vn_lock(vp, flags, p) ! 515: struct vnode *vp; ! 516: int flags; ! 517: struct proc *p; ! 518: { ! 519: int error; ! 520: ! 521: do { ! 522: if ((flags & LK_INTERLOCK) == 0) ! 523: simple_lock(&vp->v_interlock); ! 524: if (vp->v_flag & VXLOCK) { ! 525: vp->v_flag |= VXWANT; ! 526: simple_unlock(&vp->v_interlock); ! 527: tsleep((caddr_t)vp, PINOD, "vn_lock", 0); ! 528: error = ENOENT; ! 529: } else { ! 530: error = VOP_LOCK(vp, flags | LK_INTERLOCK, p); ! 531: if (error == 0) ! 532: return (error); ! 533: } ! 534: flags &= ~LK_INTERLOCK; ! 535: } while (flags & LK_RETRY); ! 536: return (error); ! 537: } ! 538: ! 539: /* ! 540: * File table vnode close routine. ! 541: */ ! 542: vn_closefile(fp, p) ! 543: struct file *fp; ! 544: struct proc *p; ! 545: { ! 546: ! 547: return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, ! 548: fp->f_cred, p)); ! 549: }
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