2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
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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 $
43 #define BLKSIZE(a, b, c) blksize(a, b, c)
44 #define FS struct ext2_sb_info
46 #define READ ext2_read
47 #define READ_S "ext2_read"
48 #define WRITE ext2_write
49 #define WRITE_S "ext2_write"
52 * Vnode op for reading.
57 struct vop_read_args /* {
64 register struct vnode *vp;
65 register struct inode *ip;
66 register struct uio *uio;
71 long size, xfersize, blkoffset;
72 int error, orig_resid;
73 int seqcount = ap->a_ioflag >> 16;
82 if (uio->uio_rw != UIO_READ)
83 panic("%s: mode", READ_S);
85 if (vp->v_type == VLNK) {
86 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
87 panic("%s: short symlink", READ_S);
88 } else if (vp->v_type != VREG && vp->v_type != VDIR)
89 panic("%s: type %d", READ_S, vp->v_type);
93 if ((u_quad_t)uio->uio_offset > fs->fs_maxfilesize)
97 orig_resid = uio->uio_resid;
98 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
99 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
101 lbn = lblkno(fs, uio->uio_offset);
103 size = BLKSIZE(fs, ip, lbn);
104 blkoffset = blkoff(fs, uio->uio_offset);
106 xfersize = fs->s_frag_size - blkoffset;
107 if (uio->uio_resid < xfersize)
108 xfersize = uio->uio_resid;
109 if (bytesinfile < xfersize)
110 xfersize = bytesinfile;
112 if (lblktosize(fs, nextlbn) >= ip->i_size)
113 error = bread(vp, lbn, size, NOCRED, &bp);
114 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0)
115 error = cluster_read(vp,
116 ip->i_size, lbn, size, NOCRED,
117 uio->uio_resid, (ap->a_ioflag >> 16), &bp);
118 else if (seqcount > 1) {
119 int nextsize = BLKSIZE(fs, ip, nextlbn);
120 error = breadn(vp, lbn,
121 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
123 error = bread(vp, lbn, size, NOCRED, &bp);
131 * We should only get non-zero b_resid when an I/O error
132 * has occurred, which should cause us to break above.
133 * However, if the short read did not cause an error,
134 * then we want to ensure that we do not uiomove bad
135 * or uninitialized data.
138 if (size < xfersize) {
144 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
152 if (orig_resid > 0 && (error == 0 || uio->uio_resid != orig_resid) &&
153 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
154 ip->i_flag |= IN_ACCESS;
159 * Vnode op for writing.
163 struct vop_write_args /* {
167 struct ucred *a_cred;
170 register struct vnode *vp;
171 register struct uio *uio;
172 register struct inode *ip;
179 int blkoffset, error, flags, ioflag, resid, size, xfersize;
181 ioflag = ap->a_ioflag;
182 seqcount = ap->a_ioflag >> 16;
188 if (uio->uio_rw != UIO_WRITE)
189 panic("%s: mode", WRITE_S);
192 switch (vp->v_type) {
194 if (ioflag & IO_APPEND)
195 uio->uio_offset = ip->i_size;
196 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
202 if ((ioflag & IO_SYNC) == 0)
203 panic("%s: nonsync dir write", WRITE_S);
206 panic("%s: type", WRITE_S);
211 if (uio->uio_offset < 0 ||
212 (u_quad_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
216 * Maybe this should be above the vnode op call, but so long as
217 * file servers have no limits, I don't think it matters.
220 if (vp->v_type == VREG && p &&
221 uio->uio_offset + uio->uio_resid >
222 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
227 resid = uio->uio_resid;
229 flags = ioflag & IO_SYNC ? B_SYNC : 0;
231 for (error = 0; uio->uio_resid > 0;) {
232 lbn = lblkno(fs, uio->uio_offset);
233 blkoffset = blkoff(fs, uio->uio_offset);
234 xfersize = fs->s_frag_size - blkoffset;
235 if (uio->uio_resid < xfersize)
236 xfersize = uio->uio_resid;
238 if (uio->uio_offset + xfersize > ip->i_size)
239 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
242 * Avoid a data-consistency race between write() and mmap()
243 * by ensuring that newly allocated blocks are zerod. The
244 * race can occur even in the case where the write covers
249 if (fs->s_frag_size > xfersize)
255 error = ext2_balloc(ip,
256 lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
260 if (uio->uio_offset + xfersize > ip->i_size) {
261 ip->i_size = uio->uio_offset + xfersize;
264 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
269 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
270 if ((ioflag & IO_VMIO) &&
271 (LIST_FIRST(&bp->b_dep) == NULL)) /* in ext2fs? */
272 bp->b_flags |= B_RELBUF;
274 if (ioflag & IO_SYNC) {
276 } else if (xfersize + blkoffset == fs->s_frag_size) {
277 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
278 bp->b_flags |= B_CLUSTEROK;
279 cluster_write(bp, ip->i_size, seqcount);
284 bp->b_flags |= B_CLUSTEROK;
287 if (error || xfersize == 0)
289 ip->i_flag |= IN_CHANGE | IN_UPDATE;
292 * If we successfully wrote any data, and we are not the superuser
293 * we clear the setuid and setgid bits as a precaution against
296 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
297 ip->i_mode &= ~(ISUID | ISGID);
299 if (ioflag & IO_UNIT) {
300 (void)UFS_TRUNCATE(vp, osize,
301 ioflag & IO_SYNC, ap->a_cred, uio->uio_procp);
302 uio->uio_offset -= resid - uio->uio_resid;
303 uio->uio_resid = resid;
305 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
306 error = UFS_UPDATE(vp, 1);