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 1.15 2008/06/19 23:27:39 dillon 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)
66 long size, xfersize, blkoffset;
67 int error, orig_resid;
68 int seqcount = ap->a_ioflag >> 16;
75 if (uio->uio_rw != UIO_READ)
76 panic("ext2_read: mode");
78 if (vp->v_type == VLNK) {
79 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
80 panic("ext2_read: short symlink");
81 } else if (vp->v_type != VREG && vp->v_type != VDIR)
82 panic("ext2_read: type %d", vp->v_type);
86 if ((u_quad_t)uio->uio_offset > fs->fs_maxfilesize)
90 orig_resid = uio->uio_resid;
91 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
92 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
94 lbn = lblkno(fs, uio->uio_offset);
96 nextloffset = lblktodoff(fs, nextlbn);
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 (nextloffset >= ip->i_size) {
107 error = bread(vp, lblktodoff(fs, lbn), size, &bp);
108 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
109 error = cluster_read(vp, (off_t)ip->i_size,
110 lblktodoff(fs, lbn), size,
112 (ap->a_ioflag >> 16) * BKVASIZE,
114 } else if (seqcount > 1) {
115 int nextsize = BLKSIZE(fs, ip, nextlbn);
116 error = breadn(vp, lblktodoff(fs, lbn),
117 size, &nextloffset, &nextsize, 1, &bp);
119 error = bread(vp, lblktodoff(fs, lbn), size, &bp);
128 * We should only get non-zero b_resid when an I/O error
129 * has occurred, which should cause us to break above.
130 * However, if the short read did not cause an error,
131 * then we want to ensure that we do not uiomove bad
132 * or uninitialized data.
135 if (size < xfersize) {
140 error = uiomove((char *)bp->b_data + blkoffset,
149 if (orig_resid > 0 && (error == 0 || uio->uio_resid != orig_resid) &&
150 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
151 ip->i_flag |= IN_ACCESS;
156 * Vnode op for writing.
158 * ext2_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
159 * struct ucred *a_cred)
162 ext2_write(struct vop_write_args *ap)
173 int blkoffset, error, flags, ioflag, resid, size, xfersize;
175 ioflag = ap->a_ioflag;
176 seqcount = ap->a_ioflag >> 16;
182 if (uio->uio_rw != UIO_WRITE)
183 panic("ext2_write: mode");
186 switch (vp->v_type) {
188 if (ioflag & IO_APPEND)
189 uio->uio_offset = ip->i_size;
190 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
196 if ((ioflag & IO_SYNC) == 0)
197 panic("ext2_write: nonsync dir write");
200 panic("ext2_write: type");
205 if (uio->uio_offset < 0 ||
206 (u_quad_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize)
210 * Maybe this should be above the vnode op call, but so long as
211 * file servers have no limits, I don't think it matters.
214 if (vp->v_type == VREG && td && td->td_proc &&
215 uio->uio_offset + uio->uio_resid >
216 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
217 lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ);
221 resid = uio->uio_resid;
223 flags = ioflag & IO_SYNC ? B_SYNC : 0;
225 for (error = 0; uio->uio_resid > 0;) {
226 lbn = lblkno(fs, uio->uio_offset);
227 blkoffset = blkoff(fs, uio->uio_offset);
228 xfersize = fs->s_frag_size - blkoffset;
229 if (uio->uio_resid < xfersize)
230 xfersize = uio->uio_resid;
232 if (uio->uio_offset + xfersize > ip->i_size)
233 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
236 * Avoid a data-consistency race between write() and mmap()
237 * by ensuring that newly allocated blocks are zerod. The
238 * race can occur even in the case where the write covers
241 * Just set B_CLRBUF unconditionally, even if the write
242 * covers the whole block. This also handles the UIO_NOCOPY
243 * case. See ffs_write() in ufs for a more sophisticated
247 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
248 ap->a_cred, &bp, flags);
252 if (uio->uio_offset + xfersize > ip->i_size) {
253 ip->i_size = uio->uio_offset + xfersize;
256 size = BLKSIZE(fs, ip, lbn) - bp->b_resid;
260 error = uiomove((char *)bp->b_data + blkoffset,
262 if ((ioflag & IO_VMIO) &&
263 LIST_FIRST(&bp->b_dep) == NULL) /* in ext2fs? */
264 bp->b_flags |= B_RELBUF;
266 if (ioflag & IO_SYNC) {
268 } else if (xfersize + blkoffset == fs->s_frag_size) {
269 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
270 bp->b_flags |= B_CLUSTEROK;
271 cluster_write(bp, (off_t)ip->i_size, vp->v_mount->mnt_stat.f_iosize, seqcount);
276 bp->b_flags |= B_CLUSTEROK;
279 if (error || xfersize == 0)
281 ip->i_flag |= IN_CHANGE | IN_UPDATE;
284 * If we successfully wrote any data, and we are not the superuser
285 * we clear the setuid and setgid bits as a precaution against
288 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
289 ip->i_mode &= ~(ISUID | ISGID);
291 if (ioflag & IO_UNIT) {
292 EXT2_TRUNCATE(vp, osize, ioflag & IO_SYNC, ap->a_cred);
293 uio->uio_offset -= resid - uio->uio_resid;
294 uio->uio_resid = resid;
296 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC))
297 error = EXT2_UPDATE(vp, 1);