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 $
41 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_readwrite.c,v 1.2 2003/06/17 04:28:34 dillon Exp $
44 #define BLKSIZE(a, b, c) blksize(a, b, c)
45 #define FS struct ext2_sb_info
47 #define READ ext2_read
48 #define READ_S "ext2_read"
49 #define WRITE ext2_write
50 #define WRITE_S "ext2_write"
53 * Vnode op for reading.
58 struct vop_read_args /* {
65 register struct vnode *vp;
66 register struct inode *ip;
67 register struct uio *uio;
72 long size, xfersize, blkoffset;
73 int error, orig_resid;
74 int seqcount = ap->a_ioflag >> 16;
83 if (uio->uio_rw != UIO_READ)
84 panic("%s: mode", READ_S);
86 if (vp->v_type == VLNK) {
87 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
88 panic("%s: short symlink", READ_S);
89 } else if (vp->v_type != VREG && vp->v_type != VDIR)
90 panic("%s: type %d", READ_S, vp->v_type);
94 if ((u_quad_t)uio->uio_offset > fs->fs_maxfilesize)
98 orig_resid = uio->uio_resid;
99 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
100 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
102 lbn = lblkno(fs, uio->uio_offset);
104 size = BLKSIZE(fs, ip, lbn);
105 blkoffset = blkoff(fs, uio->uio_offset);
107 xfersize = fs->s_frag_size - blkoffset;
108 if (uio->uio_resid < xfersize)
109 xfersize = uio->uio_resid;
110 if (bytesinfile < xfersize)
111 xfersize = bytesinfile;
113 if (lblktosize(fs, nextlbn) >= ip->i_size)
114 error = bread(vp, lbn, size, NOCRED, &bp);
115 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0)
116 error = cluster_read(vp,
117 ip->i_size, lbn, size, NOCRED,
118 uio->uio_resid, (ap->a_ioflag >> 16), &bp);
119 else if (seqcount > 1) {
120 int nextsize = BLKSIZE(fs, ip, nextlbn);
121 error = breadn(vp, lbn,
122 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
124 error = bread(vp, lbn, size, NOCRED, &bp);
132 * We should only get non-zero b_resid when an I/O error
133 * has occurred, which should cause us to break above.
134 * However, if the short read did not cause an error,
135 * then we want to ensure that we do not uiomove bad
136 * or uninitialized data.
139 if (size < xfersize) {
145 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
153 if (orig_resid > 0 && (error == 0 || uio->uio_resid != orig_resid) &&
154 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
155 ip->i_flag |= IN_ACCESS;
160 * Vnode op for writing.
164 struct vop_write_args /* {
168 struct ucred *a_cred;
171 register struct vnode *vp;
172 register struct uio *uio;
173 register struct inode *ip;
180 int blkoffset, error, flags, ioflag, resid, size, xfersize;
182 ioflag = ap->a_ioflag;
183 seqcount = ap->a_ioflag >> 16;
189 if (uio->uio_rw != UIO_WRITE)
190 panic("%s: mode", WRITE_S);
193 switch (vp->v_type) {
195 if (ioflag & IO_APPEND)
196 uio->uio_offset = ip->i_size;
197 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
203 if ((ioflag & IO_SYNC) == 0)
204 panic("%s: nonsync dir write", WRITE_S);
207 panic("%s: type", WRITE_S);
212 if (uio->uio_offset < 0 ||
213 (u_quad_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
217 * Maybe this should be above the vnode op call, but so long as
218 * file servers have no limits, I don't think it matters.
221 if (vp->v_type == VREG && p &&
222 uio->uio_offset + uio->uio_resid >
223 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
228 resid = uio->uio_resid;
230 flags = ioflag & IO_SYNC ? B_SYNC : 0;
232 for (error = 0; uio->uio_resid > 0;) {
233 lbn = lblkno(fs, uio->uio_offset);
234 blkoffset = blkoff(fs, uio->uio_offset);
235 xfersize = fs->s_frag_size - blkoffset;
236 if (uio->uio_resid < xfersize)
237 xfersize = uio->uio_resid;
239 if (uio->uio_offset + xfersize > ip->i_size)
240 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
243 * Avoid a data-consistency race between write() and mmap()
244 * by ensuring that newly allocated blocks are zerod. The
245 * race can occur even in the case where the write covers
250 if (fs->s_frag_size > xfersize)
256 error = ext2_balloc(ip,
257 lbn, blkoffset + xfersize, ap->a_cred, &bp, flags);
261 if (uio->uio_offset + xfersize > ip->i_size) {
262 ip->i_size = uio->uio_offset + xfersize;
265 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
270 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
271 if ((ioflag & IO_VMIO) &&
272 (LIST_FIRST(&bp->b_dep) == NULL)) /* in ext2fs? */
273 bp->b_flags |= B_RELBUF;
275 if (ioflag & IO_SYNC) {
277 } else if (xfersize + blkoffset == fs->s_frag_size) {
278 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
279 bp->b_flags |= B_CLUSTEROK;
280 cluster_write(bp, ip->i_size, seqcount);
285 bp->b_flags |= B_CLUSTEROK;
288 if (error || xfersize == 0)
290 ip->i_flag |= IN_CHANGE | IN_UPDATE;
293 * If we successfully wrote any data, and we are not the superuser
294 * we clear the setuid and setgid bits as a precaution against
297 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
298 ip->i_mode &= ~(ISUID | ISGID);
300 if (ioflag & IO_UNIT) {
301 (void)UFS_TRUNCATE(vp, osize,
302 ioflag & IO_SYNC, ap->a_cred, uio->uio_procp);
303 uio->uio_offset -= resid - uio->uio_resid;
304 uio->uio_resid = resid;
306 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
307 error = UFS_UPDATE(vp, 1);