4ca1f26828
Primarily, this feature extends the inode block count field to 48 bits. Additionally, this feature allows this field to be represented in file system block size units rather than DEV_BSIZE units.
404 lines
11 KiB
C
404 lines
11 KiB
C
/* $NetBSD: ext2fs_readwrite.c,v 1.62 2012/11/21 23:11:23 jakllsch 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 8.8 (Berkeley) 8/4/94
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* Modified for ext2fs by Manuel Bouyer.
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*/
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/*-
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* Copyright (c) 1997 Manuel Bouyer.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @(#)ufs_readwrite.c 8.8 (Berkeley) 8/4/94
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* Modified for ext2fs by Manuel Bouyer.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_readwrite.c,v 1.62 2012/11/21 23:11:23 jakllsch Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/kernel.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/signalvar.h>
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#include <sys/kauth.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_extern.h>
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#define doclusterread 0 /* XXX underway */
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#define doclusterwrite 0
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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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ext2fs_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 m_ext2fs *fs;
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struct buf *bp;
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struct ufsmount *ump;
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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;
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vp = ap->a_vp;
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ip = VTOI(vp);
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ump = ip->i_ump;
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uio = ap->a_uio;
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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", "ext2fs_read");
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if (vp->v_type == VLNK) {
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if (ext2fs_size(ip) < ump->um_maxsymlinklen ||
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(ump->um_maxsymlinklen == 0 && ext2fs_nblock(ip) == 0))
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panic("%s: short symlink", "ext2fs_read");
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} else if (vp->v_type != VREG && vp->v_type != VDIR)
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panic("%s: type %d", "ext2fs_read", vp->v_type);
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#endif
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fs = ip->i_e2fs;
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if ((uint64_t)uio->uio_offset > ump->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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if (uio->uio_offset >= ext2fs_size(ip))
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goto out;
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if (vp->v_type == VREG) {
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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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bytelen = MIN(ext2fs_size(ip) - 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 = ext2fs_size(ip) - uio->uio_offset;
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if (bytesinfile <= 0)
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break;
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lbn = lblkno(fs, uio->uio_offset);
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nextlbn = lbn + 1;
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size = fs->e2fs_bsize;
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blkoffset = blkoff(fs, uio->uio_offset);
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xfersize = fs->e2fs_bsize - blkoffset;
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if (uio->uio_resid < xfersize)
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xfersize = uio->uio_resid;
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if (bytesinfile < xfersize)
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xfersize = bytesinfile;
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if (lblktosize(fs, nextlbn) >= ext2fs_size(ip))
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error = bread(vp, lbn, size, NOCRED, 0, &bp);
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else {
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int nextsize = fs->e2fs_bsize;
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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 = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT);
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}
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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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ext2fs_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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struct m_ext2fs *fs;
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struct buf *bp;
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struct ufsmount *ump;
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daddr_t lbn;
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off_t osize;
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int blkoffset, error, flags, ioflag, resid, xfersize;
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vsize_t bytelen;
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off_t oldoff = 0; /* XXX */
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bool async;
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int extended = 0;
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int advice;
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ioflag = ap->a_ioflag;
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advice = IO_ADV_DECODE(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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ump = ip->i_ump;
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error = 0;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_WRITE)
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panic("%s: mode", "ext2fs_write");
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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 = ext2fs_size(ip);
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if ((ip->i_e2fs_flags & EXT2_APPEND) &&
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uio->uio_offset != ext2fs_size(ip))
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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", "ext2fs_write");
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break;
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default:
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panic("%s: type", "ext2fs_write");
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}
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fs = ip->i_e2fs;
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if (uio->uio_offset < 0 ||
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(uint64_t)uio->uio_offset + uio->uio_resid > ump->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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async = vp->v_mount->mnt_flag & MNT_ASYNC;
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resid = uio->uio_resid;
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osize = ext2fs_size(ip);
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if (vp->v_type == VREG) {
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while (uio->uio_resid > 0) {
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oldoff = uio->uio_offset;
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blkoffset = blkoff(fs, uio->uio_offset);
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bytelen = MIN(fs->e2fs_bsize - blkoffset,
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uio->uio_resid);
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if (vp->v_size < oldoff + bytelen) {
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uvm_vnp_setwritesize(vp, oldoff + bytelen);
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}
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error = ufs_balloc_range(vp, uio->uio_offset,
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bytelen, ap->a_cred, 0);
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if (error)
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break;
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error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
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UBC_WRITE | UBC_UNMAP_FLAG(vp));
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if (error)
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break;
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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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if (vp->v_size < uio->uio_offset) {
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uvm_vnp_setsize(vp, uio->uio_offset);
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extended = 1;
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}
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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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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_LAZY);
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}
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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(oldoff),
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round_page(blkroundup(fs, uio->uio_offset)),
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PGO_CLEANIT | PGO_SYNCIO);
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}
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goto out;
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}
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flags = ioflag & IO_SYNC ? B_SYNC : 0;
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for (error = 0; uio->uio_resid > 0;) {
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lbn = lblkno(fs, uio->uio_offset);
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blkoffset = blkoff(fs, uio->uio_offset);
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xfersize = MIN(fs->e2fs_bsize - blkoffset, uio->uio_resid);
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if (xfersize < fs->e2fs_bsize)
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flags |= B_CLRBUF;
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else
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flags &= ~B_CLRBUF;
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error = ext2fs_balloc(ip,
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lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
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if (error)
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break;
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if (ext2fs_size(ip) < uio->uio_offset + xfersize) {
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error = ext2fs_setsize(ip, uio->uio_offset + xfersize);
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if (error)
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break;
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}
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error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio);
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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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if (vp->v_size < uio->uio_offset) {
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uvm_vnp_setsize(vp, uio->uio_offset);
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extended = 1;
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}
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if (ioflag & IO_SYNC)
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(void)bwrite(bp);
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else if (xfersize + blkoffset == fs->e2fs_bsize)
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bawrite(bp);
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else
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bdwrite(bp);
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if (error || xfersize == 0)
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break;
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}
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/*
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* If we successfully wrote any data, and we are not the superuser
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* we clear the setuid and setgid bits as a precaution against
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* tampering.
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*/
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out:
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ip->i_flag |= IN_CHANGE | IN_UPDATE;
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if (vp->v_mount->mnt_flag & MNT_RELATIME)
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ip->i_flag |= IN_ACCESS;
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if (resid > uio->uio_resid && ap->a_cred) {
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if (ip->i_e2fs_mode & ISUID) {
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if (kauth_authorize_vnode(ap->a_cred,
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KAUTH_VNODE_RETAIN_SUID, vp, NULL, EPERM) != 0)
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ip->i_e2fs_mode &= ISUID;
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}
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if (ip->i_e2fs_mode & ISGID) {
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if (kauth_authorize_vnode(ap->a_cred,
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KAUTH_VNODE_RETAIN_SGID, vp, NULL, EPERM) != 0)
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ip->i_e2fs_mode &= ~ISGID;
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}
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}
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if (resid > uio->uio_resid)
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VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
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if (error) {
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(void) ext2fs_truncate(vp, osize, ioflag & IO_SYNC, ap->a_cred);
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uio->uio_offset -= resid - uio->uio_resid;
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uio->uio_resid = resid;
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} else if (resid > uio->uio_resid && (ioflag & IO_SYNC) == IO_SYNC)
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error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT);
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KASSERT(vp->v_size == ext2fs_size(ip));
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return (error);
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}
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