+/*
+ * Vnode op for reading.
+ */
+/* ARGSUSED */
+ufs_read(vp, uio, ioflag, cred)
+ struct vnode *vp;
+ register struct uio *uio;
+ int ioflag;
+ struct ucred *cred;
+{
+ register struct inode *ip = VTOI(vp);
+ register struct fs *fs;
+ struct buf *bp;
+ daddr_t lbn, bn, rablock;
+ int size, diff, error = 0;
+ long n, on, type;
+
+ if (uio->uio_rw != UIO_READ)
+ panic("ufs_read mode");
+ type = ip->i_mode & IFMT;
+ if (type != IFDIR && type != IFREG && type != IFLNK)
+ panic("ufs_read type");
+ if (uio->uio_resid == 0)
+ return (0);
+ if (uio->uio_offset < 0)
+ return (EINVAL);
+ ip->i_flag |= IACC;
+ fs = ip->i_fs;
+ do {
+ lbn = lblkno(fs, uio->uio_offset);
+ on = blkoff(fs, uio->uio_offset);
+ n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
+ diff = ip->i_size - uio->uio_offset;
+ if (diff <= 0)
+ return (0);
+ if (diff < n)
+ n = diff;
+ size = blksize(fs, ip, lbn);
+ rablock = lbn + 1;
+ if (vp->v_lastr + 1 == lbn &&
+ lblktosize(fs, rablock) < ip->i_size)
+ error = breada(ITOV(ip), lbn, size, rablock,
+ blksize(fs, ip, rablock), NOCRED, &bp);
+ else
+ error = bread(ITOV(ip), lbn, size, NOCRED, &bp);
+ vp->v_lastr = lbn;
+ n = MIN(n, size - bp->b_resid);
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
+ if (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size)
+ bp->b_flags |= B_AGE;
+ brelse(bp);
+ } while (error == 0 && uio->uio_resid > 0 && n != 0);
+ return (error);
+}
+
+/*
+ * Vnode op for writing.
+ */
+ufs_write(vp, uio, ioflag, cred)
+ register struct vnode *vp;
+ struct uio *uio;
+ int ioflag;
+ struct ucred *cred;
+{
+ register struct inode *ip = VTOI(vp);
+ register struct fs *fs;
+ struct buf *bp;
+ daddr_t lbn, bn;
+ u_long osize;
+ int i, n, on, flags;
+ int count, size, resid, error = 0;
+
+ if (uio->uio_rw != UIO_WRITE)
+ panic("ufs_write mode");
+ switch (vp->v_type) {
+ case VREG:
+ if (ioflag & IO_APPEND)
+ uio->uio_offset = ip->i_size;
+ /* fall through */
+ case VLNK:
+ break;
+
+ case VDIR:
+ if ((ioflag & IO_SYNC) == 0)
+ panic("ufs_write nonsync dir write");
+ break;
+
+ default:
+ panic("ufs_write type");
+ }
+ if (uio->uio_offset < 0)
+ return (EINVAL);
+ if (uio->uio_resid == 0)
+ return (0);
+ /*
+ * Maybe this should be above the vnode op call, but so long as
+ * file servers have no limits, i don't think it matters
+ */
+ if (vp->v_type == VREG &&
+ uio->uio_offset + uio->uio_resid >
+ u.u_rlimit[RLIMIT_FSIZE].rlim_cur) {
+ psignal(u.u_procp, SIGXFSZ);
+ return (EFBIG);
+ }
+ resid = uio->uio_resid;
+ osize = ip->i_size;
+ fs = ip->i_fs;
+ flags = 0;
+ if (ioflag & IO_SYNC)
+ flags = B_SYNC;
+ do {
+ lbn = lblkno(fs, uio->uio_offset);
+ on = blkoff(fs, uio->uio_offset);
+ n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
+ if (n < fs->fs_bsize)
+ flags |= B_CLRBUF;
+ else
+ flags &= ~B_CLRBUF;
+ if (error = balloc(ip, lbn, (int)(on + n), &bp, flags))
+ break;
+ bn = bp->b_blkno;
+ if (uio->uio_offset + n > ip->i_size)
+ ip->i_size = uio->uio_offset + n;
+ size = blksize(fs, ip, lbn);
+ count = howmany(size, CLBYTES);
+ for (i = 0; i < count; i++)
+ munhash(ip->i_devvp, bn + i * CLBYTES / DEV_BSIZE);
+ n = MIN(n, size - bp->b_resid);
+ error = uiomove(bp->b_un.b_addr + on, n, uio);
+ if (ioflag & IO_SYNC)
+ (void) bwrite(bp);
+ else if (n + on == fs->fs_bsize) {
+ bp->b_flags |= B_AGE;
+ bawrite(bp);
+ } else
+ bdwrite(bp);
+ ip->i_flag |= IUPD|ICHG;
+ if (cred->cr_uid != 0)
+ ip->i_mode &= ~(ISUID|ISGID);
+ } while (error == 0 && uio->uio_resid > 0 && n != 0);
+ if (error && (ioflag & IO_UNIT)) {
+ (void) itrunc(ip, osize, ioflag & IO_SYNC);
+ uio->uio_offset -= resid - uio->uio_resid;
+ uio->uio_resid = resid;
+ }
+ return (error);
+}
+
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