- Fix for possible unset uid/gid in toproto - Fix for default mtree style - Update libelf - Importing libexecinfo - Resynchronize GCC, mpc, gmp, mpfr - build.sh: Replace params with show-params. This has been done as the make target has been renamed in the same way, while a new target named params has been added. This new target generates a file containing all the parameters, instead of printing it on the console. - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org) get getservbyport() out of the inner loop Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
527 lines
14 KiB
C
527 lines
14 KiB
C
/* $NetBSD: ulfs_readwrite.c,v 1.7 2013/10/17 21:01:08 christos Exp $ */
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/* from NetBSD: ufs_readwrite.c,v 1.105 2013/01/22 09:39:18 dholland Exp */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ufs_readwrite.c 8.11 (Berkeley) 5/8/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: ulfs_readwrite.c,v 1.7 2013/10/17 21:01:08 christos Exp $");
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#ifdef LFS_READWRITE
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#define FS struct lfs
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#define I_FS i_lfs
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#define READ lfs_read
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#define READ_S "lfs_read"
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#define WRITE lfs_write
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#define WRITE_S "lfs_write"
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#define fs_bsize lfs_bsize
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#define fs_bmask lfs_bmask
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#else
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#define FS struct fs
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#define I_FS i_fs
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#define READ ffs_read
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#define READ_S "ffs_read"
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#define WRITE ffs_write
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#define WRITE_S "ffs_write"
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#endif
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/*
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* Vnode op for reading.
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*/
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/* ARGSUSED */
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int
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READ(void *v)
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{
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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kauth_cred_t a_cred;
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} */ *ap = v;
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struct vnode *vp;
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struct inode *ip;
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struct uio *uio;
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struct buf *bp;
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FS *fs;
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vsize_t bytelen;
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daddr_t lbn, nextlbn;
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off_t bytesinfile;
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long size, xfersize, blkoffset;
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int error, ioflag;
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bool usepc = false;
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vp = ap->a_vp;
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ip = VTOI(vp);
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fs = ip->I_FS;
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uio = ap->a_uio;
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ioflag = ap->a_ioflag;
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error = 0;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("%s: mode", READ_S);
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if (vp->v_type == VLNK) {
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if (ip->i_size < fs->um_maxsymlinklen ||
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(fs->um_maxsymlinklen == 0 && DIP(ip, blocks) == 0))
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panic("%s: short symlink", READ_S);
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} else if (vp->v_type != VREG && vp->v_type != VDIR)
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panic("%s: type %d", READ_S, vp->v_type);
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#endif
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if ((u_int64_t)uio->uio_offset > fs->um_maxfilesize)
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return (EFBIG);
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if (uio->uio_resid == 0)
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return (0);
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#ifndef LFS_READWRITE
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if ((ip->i_flags & (SF_SNAPSHOT | SF_SNAPINVAL)) == SF_SNAPSHOT)
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return ffs_snapshot_read(vp, uio, ioflag);
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#endif /* !LFS_READWRITE */
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fstrans_start(vp->v_mount, FSTRANS_SHARED);
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if (uio->uio_offset >= ip->i_size)
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goto out;
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#ifdef LFS_READWRITE
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usepc = (vp->v_type == VREG && ip->i_number != LFS_IFILE_INUM);
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#else /* !LFS_READWRITE */
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usepc = vp->v_type == VREG;
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#endif /* !LFS_READWRITE */
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if (usepc) {
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const int advice = IO_ADV_DECODE(ap->a_ioflag);
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while (uio->uio_resid > 0) {
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if (ioflag & IO_DIRECT) {
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genfs_directio(vp, uio, ioflag);
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}
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bytelen = MIN(ip->i_size - uio->uio_offset,
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uio->uio_resid);
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if (bytelen == 0)
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break;
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error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
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UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
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if (error)
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break;
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}
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goto out;
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}
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for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
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bytesinfile = ip->i_size - uio->uio_offset;
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if (bytesinfile <= 0)
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break;
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lbn = lfs_lblkno(fs, uio->uio_offset);
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nextlbn = lbn + 1;
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size = lfs_blksize(fs, ip, lbn);
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blkoffset = lfs_blkoff(fs, uio->uio_offset);
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xfersize = MIN(MIN(fs->fs_bsize - blkoffset, uio->uio_resid),
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bytesinfile);
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if (lfs_lblktosize(fs, nextlbn) >= ip->i_size)
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error = bread(vp, lbn, size, NOCRED, 0, &bp);
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else {
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int nextsize = lfs_blksize(fs, ip, nextlbn);
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error = breadn(vp, lbn,
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size, &nextlbn, &nextsize, 1, NOCRED, 0, &bp);
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}
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if (error)
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break;
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/*
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* We should only get non-zero b_resid when an I/O error
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* has occurred, which should cause us to break above.
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* However, if the short read did not cause an error,
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* then we want to ensure that we do not uiomove bad
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* or uninitialized data.
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*/
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size -= bp->b_resid;
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if (size < xfersize) {
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if (size == 0)
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break;
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xfersize = size;
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}
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error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio);
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if (error)
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break;
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brelse(bp, 0);
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}
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if (bp != NULL)
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brelse(bp, 0);
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out:
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if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) {
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ip->i_flag |= IN_ACCESS;
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if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) {
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error = lfs_update(vp, NULL, NULL, UPDATE_WAIT);
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}
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}
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fstrans_done(vp->v_mount);
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return (error);
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}
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/*
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* Vnode op for writing.
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*/
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int
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WRITE(void *v)
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{
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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kauth_cred_t a_cred;
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} */ *ap = v;
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struct vnode *vp;
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struct uio *uio;
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struct inode *ip;
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FS *fs;
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struct buf *bp;
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kauth_cred_t cred;
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daddr_t lbn;
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off_t osize, origoff, oldoff, preallocoff, endallocoff, nsize;
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int blkoffset, error, flags, ioflag, resid, size, xfersize;
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int aflag;
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int extended=0;
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vsize_t bytelen;
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bool async;
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bool usepc = false;
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#ifdef LFS_READWRITE
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bool need_unreserve = false;
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#endif
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cred = ap->a_cred;
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ioflag = ap->a_ioflag;
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uio = ap->a_uio;
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vp = ap->a_vp;
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ip = VTOI(vp);
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KASSERT(vp->v_size == ip->i_size);
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_WRITE)
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panic("%s: mode", WRITE_S);
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#endif
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switch (vp->v_type) {
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case VREG:
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if (ioflag & IO_APPEND)
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uio->uio_offset = ip->i_size;
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if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
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return (EPERM);
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/* FALLTHROUGH */
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case VLNK:
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break;
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case VDIR:
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if ((ioflag & IO_SYNC) == 0)
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panic("%s: nonsync dir write", WRITE_S);
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break;
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default:
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panic("%s: type", WRITE_S);
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}
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fs = ip->I_FS;
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if (uio->uio_offset < 0 ||
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(u_int64_t)uio->uio_offset + uio->uio_resid > fs->um_maxfilesize)
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return (EFBIG);
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#ifdef LFS_READWRITE
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/* Disallow writes to the Ifile, even if noschg flag is removed */
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/* XXX can this go away when the Ifile is no longer in the namespace? */
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if (vp == fs->lfs_ivnode)
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return (EPERM);
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#endif
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if (uio->uio_resid == 0)
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return (0);
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fstrans_start(vp->v_mount, FSTRANS_SHARED);
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flags = ioflag & IO_SYNC ? B_SYNC : 0;
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async = vp->v_mount->mnt_flag & MNT_ASYNC;
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origoff = uio->uio_offset;
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resid = uio->uio_resid;
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osize = ip->i_size;
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error = 0;
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usepc = vp->v_type == VREG;
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#ifdef LFS_READWRITE
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async = true;
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lfs_availwait(fs, lfs_btofsb(fs, uio->uio_resid));
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lfs_check(vp, LFS_UNUSED_LBN, 0);
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#endif /* !LFS_READWRITE */
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if (!usepc)
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goto bcache;
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preallocoff = round_page(lfs_blkroundup(fs, MAX(osize, uio->uio_offset)));
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aflag = ioflag & IO_SYNC ? B_SYNC : 0;
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nsize = MAX(osize, uio->uio_offset + uio->uio_resid);
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endallocoff = nsize - lfs_blkoff(fs, nsize);
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/*
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* if we're increasing the file size, deal with expanding
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* the fragment if there is one.
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*/
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if (nsize > osize && lfs_lblkno(fs, osize) < ULFS_NDADDR &&
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lfs_lblkno(fs, osize) != lfs_lblkno(fs, nsize) &&
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lfs_blkroundup(fs, osize) != osize) {
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off_t eob;
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eob = lfs_blkroundup(fs, osize);
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uvm_vnp_setwritesize(vp, eob);
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error = ulfs_balloc_range(vp, osize, eob - osize, cred, aflag);
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if (error)
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goto out;
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if (flags & B_SYNC) {
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mutex_enter(vp->v_interlock);
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VOP_PUTPAGES(vp, trunc_page(osize & fs->fs_bmask),
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round_page(eob),
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PGO_CLEANIT | PGO_SYNCIO | PGO_JOURNALLOCKED);
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}
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}
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while (uio->uio_resid > 0) {
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int ubc_flags = UBC_WRITE;
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bool overwrite; /* if we're overwrite a whole block */
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off_t newoff;
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if (ioflag & IO_DIRECT) {
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genfs_directio(vp, uio, ioflag | IO_JOURNALLOCKED);
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}
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oldoff = uio->uio_offset;
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blkoffset = lfs_blkoff(fs, uio->uio_offset);
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bytelen = MIN(fs->fs_bsize - blkoffset, uio->uio_resid);
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if (bytelen == 0) {
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break;
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}
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/*
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* if we're filling in a hole, allocate the blocks now and
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* initialize the pages first. if we're extending the file,
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* we can safely allocate blocks without initializing pages
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* since the new blocks will be inaccessible until the write
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* is complete.
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*/
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overwrite = uio->uio_offset >= preallocoff &&
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uio->uio_offset < endallocoff;
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if (!overwrite && (vp->v_vflag & VV_MAPPED) == 0 &&
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lfs_blkoff(fs, uio->uio_offset) == 0 &&
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(uio->uio_offset & PAGE_MASK) == 0) {
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vsize_t len;
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len = trunc_page(bytelen);
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len -= lfs_blkoff(fs, len);
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if (len > 0) {
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overwrite = true;
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bytelen = len;
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}
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}
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newoff = oldoff + bytelen;
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if (vp->v_size < newoff) {
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uvm_vnp_setwritesize(vp, newoff);
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}
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if (!overwrite) {
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error = ulfs_balloc_range(vp, uio->uio_offset, bytelen,
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cred, aflag);
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if (error)
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break;
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} else {
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genfs_node_wrlock(vp);
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error = GOP_ALLOC(vp, uio->uio_offset, bytelen,
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aflag, cred);
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genfs_node_unlock(vp);
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if (error)
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break;
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ubc_flags |= UBC_FAULTBUSY;
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}
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/*
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* copy the data.
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*/
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error = ubc_uiomove(&vp->v_uobj, uio, bytelen,
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IO_ADV_DECODE(ioflag), ubc_flags | UBC_UNMAP_FLAG(vp));
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/*
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* update UVM's notion of the size now that we've
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* copied the data into the vnode's pages.
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*
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* we should update the size even when uiomove failed.
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*/
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if (vp->v_size < newoff) {
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uvm_vnp_setsize(vp, newoff);
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extended = 1;
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}
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if (error)
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break;
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/*
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* flush what we just wrote if necessary.
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* XXXUBC simplistic async flushing.
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*/
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#ifndef LFS_READWRITE
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if (!async && oldoff >> 16 != uio->uio_offset >> 16) {
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mutex_enter(vp->v_interlock);
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error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16,
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(uio->uio_offset >> 16) << 16,
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PGO_CLEANIT | PGO_JOURNALLOCKED | PGO_LAZY);
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if (error)
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break;
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}
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#else
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__USE(async);
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#endif
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}
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if (error == 0 && ioflag & IO_SYNC) {
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mutex_enter(vp->v_interlock);
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error = VOP_PUTPAGES(vp, trunc_page(origoff & fs->fs_bmask),
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round_page(lfs_blkroundup(fs, uio->uio_offset)),
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PGO_CLEANIT | PGO_SYNCIO | PGO_JOURNALLOCKED);
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}
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goto out;
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bcache:
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mutex_enter(vp->v_interlock);
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VOP_PUTPAGES(vp, trunc_page(origoff), round_page(origoff + resid),
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PGO_CLEANIT | PGO_FREE | PGO_SYNCIO | PGO_JOURNALLOCKED);
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while (uio->uio_resid > 0) {
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lbn = lfs_lblkno(fs, uio->uio_offset);
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blkoffset = lfs_blkoff(fs, uio->uio_offset);
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xfersize = MIN(fs->fs_bsize - blkoffset, uio->uio_resid);
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if (fs->fs_bsize > xfersize)
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flags |= B_CLRBUF;
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else
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flags &= ~B_CLRBUF;
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#ifdef LFS_READWRITE
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error = lfs_reserve(fs, vp, NULL,
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lfs_btofsb(fs, (ULFS_NIADDR + 1) << fs->lfs_bshift));
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if (error)
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break;
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need_unreserve = true;
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#endif
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error = lfs_balloc(vp, uio->uio_offset, xfersize,
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ap->a_cred, flags, &bp);
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if (error)
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break;
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if (uio->uio_offset + xfersize > ip->i_size) {
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ip->i_size = uio->uio_offset + xfersize;
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DIP_ASSIGN(ip, size, ip->i_size);
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uvm_vnp_setsize(vp, ip->i_size);
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extended = 1;
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}
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size = lfs_blksize(fs, ip, lbn) - bp->b_resid;
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if (xfersize > size)
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xfersize = size;
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error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio);
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/*
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* if we didn't clear the block and the uiomove failed,
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* the buf will now contain part of some other file,
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* so we need to invalidate it.
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*/
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if (error && (flags & B_CLRBUF) == 0) {
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brelse(bp, BC_INVAL);
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break;
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}
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#ifdef LFS_READWRITE
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(void)VOP_BWRITE(bp->b_vp, bp);
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lfs_reserve(fs, vp, NULL,
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-lfs_btofsb(fs, (ULFS_NIADDR + 1) << fs->lfs_bshift));
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need_unreserve = false;
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#else
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if (ioflag & IO_SYNC)
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(void)bwrite(bp);
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else if (xfersize + blkoffset == fs->fs_bsize)
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|
bawrite(bp);
|
|
else
|
|
bdwrite(bp);
|
|
#endif
|
|
if (error || xfersize == 0)
|
|
break;
|
|
}
|
|
#ifdef LFS_READWRITE
|
|
if (need_unreserve) {
|
|
lfs_reserve(fs, vp, NULL,
|
|
-lfs_btofsb(fs, (ULFS_NIADDR + 1) << fs->lfs_bshift));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If we successfully wrote any data, and we are not the superuser
|
|
* we clear the setuid and setgid bits as a precaution against
|
|
* tampering.
|
|
*/
|
|
out:
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (vp->v_mount->mnt_flag & MNT_RELATIME)
|
|
ip->i_flag |= IN_ACCESS;
|
|
if (resid > uio->uio_resid && ap->a_cred) {
|
|
if (ip->i_mode & ISUID) {
|
|
if (kauth_authorize_vnode(ap->a_cred,
|
|
KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0) {
|
|
ip->i_mode &= ~ISUID;
|
|
DIP_ASSIGN(ip, mode, ip->i_mode);
|
|
}
|
|
}
|
|
|
|
if (ip->i_mode & ISGID) {
|
|
if (kauth_authorize_vnode(ap->a_cred,
|
|
KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0) {
|
|
ip->i_mode &= ~ISGID;
|
|
DIP_ASSIGN(ip, mode, ip->i_mode);
|
|
}
|
|
}
|
|
}
|
|
if (resid > uio->uio_resid)
|
|
VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
|
|
if (error) {
|
|
(void) lfs_truncate(vp, osize, ioflag & IO_SYNC, ap->a_cred);
|
|
uio->uio_offset -= resid - uio->uio_resid;
|
|
uio->uio_resid = resid;
|
|
} else if (resid > uio->uio_resid && (ioflag & IO_SYNC) == IO_SYNC) {
|
|
error = lfs_update(vp, NULL, NULL, UPDATE_WAIT);
|
|
} else {
|
|
/* nothing */
|
|
}
|
|
KASSERT(vp->v_size == ip->i_size);
|
|
fstrans_done(vp->v_mount);
|
|
|
|
return (error);
|
|
}
|