2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
9 * The Regents of the University of California. All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * @(#)ufs_readwrite.c 8.7 (Berkeley) 1/21/94
40 * $FreeBSD: src/sys/gnu/ext2fs/ext2_readwrite.c,v 1.18.2.2 2000/12/22 18:44:33 dillon Exp $
41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_readwrite.c,v 1.8 2006/01/13 21:09:27 swildner Exp $
44 #define BLKSIZE(a, b, c) blksize(a, b, c)
45 #define FS struct ext2_sb_info
49 * Vnode op for reading.
51 * ext2_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
52 * struct ucred *a_cred)
56 ext2_read(struct vop_read_args *ap)
65 long size, xfersize, blkoffset;
66 int error, orig_resid;
67 int seqcount = ap->a_ioflag >> 16;
76 if (uio->uio_rw != UIO_READ)
77 panic("ext2_read: mode");
79 if (vp->v_type == VLNK) {
80 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
81 panic("ext2_read: short symlink");
82 } else if (vp->v_type != VREG && vp->v_type != VDIR)
83 panic("ext2_read: type %d", vp->v_type);
87 if ((u_quad_t)uio->uio_offset > fs->fs_maxfilesize)
91 orig_resid = uio->uio_resid;
92 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
93 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
95 lbn = lblkno(fs, uio->uio_offset);
97 size = BLKSIZE(fs, ip, lbn);
98 blkoffset = blkoff(fs, uio->uio_offset);
100 xfersize = fs->s_frag_size - blkoffset;
101 if (uio->uio_resid < xfersize)
102 xfersize = uio->uio_resid;
103 if (bytesinfile < xfersize)
104 xfersize = bytesinfile;
106 if (lblktosize(fs, nextlbn) >= ip->i_size)
107 error = bread(vp, lbn, size, &bp);
108 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0)
109 error = cluster_read(vp, ip->i_size, lbn, size,
110 uio->uio_resid, (ap->a_ioflag >> 16), &bp);
111 else if (seqcount > 1) {
112 int nextsize = BLKSIZE(fs, ip, nextlbn);
113 error = breadn(vp, lbn,
114 size, &nextlbn, &nextsize, 1, &bp);
116 error = bread(vp, lbn, size, &bp);
124 * We should only get non-zero b_resid when an I/O error
125 * has occurred, which should cause us to break above.
126 * However, if the short read did not cause an error,
127 * then we want to ensure that we do not uiomove bad
128 * or uninitialized data.
131 if (size < xfersize) {
137 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
145 if (orig_resid > 0 && (error == 0 || uio->uio_resid != orig_resid) &&
146 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
147 ip->i_flag |= IN_ACCESS;
152 * Vnode op for writing.
154 * ext2_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
155 * struct ucred *a_cred)
158 ext2_write(struct vop_write_args *ap)
169 int blkoffset, error, flags, ioflag, resid, size, xfersize;
171 ioflag = ap->a_ioflag;
172 seqcount = ap->a_ioflag >> 16;
178 if (uio->uio_rw != UIO_WRITE)
179 panic("ext2_write: mode");
182 switch (vp->v_type) {
184 if (ioflag & IO_APPEND)
185 uio->uio_offset = ip->i_size;
186 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
192 if ((ioflag & IO_SYNC) == 0)
193 panic("ext2_write: nonsync dir write");
196 panic("ext2_write: type");
201 if (uio->uio_offset < 0 ||
202 (u_quad_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
206 * Maybe this should be above the vnode op call, but so long as
207 * file servers have no limits, I don't think it matters.
210 if (vp->v_type == VREG && td && td->td_proc &&
211 uio->uio_offset + uio->uio_resid >
212 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
213 psignal(td->td_proc, SIGXFSZ);
217 resid = uio->uio_resid;
219 flags = ioflag & IO_SYNC ? B_SYNC : 0;
221 for (error = 0; uio->uio_resid > 0;) {
222 lbn = lblkno(fs, uio->uio_offset);
223 blkoffset = blkoff(fs, uio->uio_offset);
224 xfersize = fs->s_frag_size - blkoffset;
225 if (uio->uio_resid < xfersize)
226 xfersize = uio->uio_resid;
228 if (uio->uio_offset + xfersize > ip->i_size)
229 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
232 * Avoid a data-consistency race between write() and mmap()
233 * by ensuring that newly allocated blocks are zerod. The
234 * race can occur even in the case where the write covers
239 if (fs->s_frag_size > xfersize)
245 error = ext2_balloc(ip,
246 lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
250 if (uio->uio_offset + xfersize > ip->i_size) {
251 ip->i_size = uio->uio_offset + xfersize;
254 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
259 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
260 if ((ioflag & IO_VMIO) &&
261 (LIST_FIRST(&bp->b_dep) == NULL)) /* in ext2fs? */
262 bp->b_flags |= B_RELBUF;
264 if (ioflag & IO_SYNC) {
266 } else if (xfersize + blkoffset == fs->s_frag_size) {
267 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
268 bp->b_flags |= B_CLUSTEROK;
269 cluster_write(bp, ip->i_size, seqcount);
274 bp->b_flags |= B_CLUSTEROK;
277 if (error || xfersize == 0)
279 ip->i_flag |= IN_CHANGE | IN_UPDATE;
282 * If we successfully wrote any data, and we are not the superuser
283 * we clear the setuid and setgid bits as a precaution against
286 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
287 ip->i_mode &= ~(ISUID | ISGID);
289 if (ioflag & IO_UNIT) {
290 UFS_TRUNCATE(vp, osize,
291 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
292 uio->uio_offset -= resid - uio->uio_resid;
293 uio->uio_resid = resid;
295 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
296 error = UFS_UPDATE(vp, 1);