e0cc03a09b
kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
380 lines
9.8 KiB
C
380 lines
9.8 KiB
C
/* $NetBSD: ext2fs_readwrite.c,v 1.26 2002/10/23 09:15:04 jdolecek Exp $ */
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/*-
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* Copyright (c) 1997 Manuel Bouyer.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_readwrite.c,v 1.26 2002/10/23 09:15:04 jdolecek 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 <ufs/ufs/inode.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(v)
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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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struct ucred *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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void *win;
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vsize_t bytelen;
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ufs_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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uio = ap->a_uio;
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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 ((int)ip->i_e2fs_size < vp->v_mount->mnt_maxsymlinklen ||
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(vp->v_mount->mnt_maxsymlinklen == 0 &&
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ip->i_e2fs_nblock == 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 ((u_int64_t)uio->uio_offset >
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((u_int64_t)0x80000000 * fs->e2fs_bsize - 1))
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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 >= ip->i_e2fs_size)
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return (0);
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if (vp->v_type == VREG) {
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error = 0;
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while (uio->uio_resid > 0) {
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bytelen = MIN(ip->i_e2fs_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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}
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win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
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&bytelen, UBC_READ);
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error = uiomove(win, bytelen, uio);
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ubc_release(win, 0);
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if (error) {
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break;
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}
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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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if ((bytesinfile = ip->i_e2fs_size - uio->uio_offset) <= 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) >= ip->i_e2fs_size)
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error = bread(vp, lbn, size, NOCRED, &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, &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);
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}
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if (bp != NULL)
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brelse(bp);
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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 = VOP_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(v)
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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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struct ucred *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 proc *p;
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ufs_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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void *win;
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off_t oldoff;
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boolean_t async;
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int extended=0;
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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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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 = ip->i_e2fs_size;
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if ((ip->i_e2fs_flags & EXT2_APPEND) &&
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uio->uio_offset != ip->i_e2fs_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", "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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(u_int64_t)uio->uio_offset + uio->uio_resid >
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((u_int64_t)0x80000000 * fs->e2fs_bsize - 1))
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return (EFBIG);
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/*
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* Maybe this should be above the vnode op call, but so long as
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* file servers have no limits, I don't think it matters.
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*/
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p = uio->uio_procp;
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if (vp->v_type == VREG && p &&
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uio->uio_offset + uio->uio_resid >
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p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
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psignal(p, SIGXFSZ);
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return (EFBIG);
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}
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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 = ip->i_e2fs_size;
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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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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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}
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win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
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&bytelen, UBC_WRITE);
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error = uiomove(win, bytelen, uio);
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ubc_release(win, 0);
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if (error) {
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break;
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}
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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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simple_lock(&vp->v_interlock);
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error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16,
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(uio->uio_offset >> 16) << 16, PGO_CLEANIT);
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}
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}
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if (error == 0 && ioflag & IO_SYNC) {
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simple_lock(&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 (ip->i_e2fs_size < uio->uio_offset + xfersize) {
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ip->i_e2fs_size = uio->uio_offset + xfersize;
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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 (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
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ip->i_e2fs_mode &= ~(ISUID | ISGID);
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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) VOP_TRUNCATE(vp, osize, ioflag & IO_SYNC, ap->a_cred,
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uio->uio_procp);
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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 = VOP_UPDATE(vp, NULL, NULL, UPDATE_WAIT);
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KASSERT(vp->v_size == ip->i_e2fs_size);
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return (error);
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}
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