Look Ma' what I found on my harddisk ...

 o New faster syscalls for 2.1.x, too
 o Upgrade to 2.1.89.

Don't try to run this.  It's flaky as hell.  But feel free to debug ...

1 files changed, 55 insertions, 2 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
index c1357f784..9052042f4 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -17,6 +17,7 @@
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <linux/pagemap.h>
+#include <linux/fat_cvf.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -104,7 +105,41 @@ struct inode_operations fat_file_inode_operations_1024 = {
 	NULL,			/* rename */
 	NULL,			/* readlink */
 	NULL,			/* follow_link */
-	NULL,			/* readpage */
+	generic_readpage,	/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	fat_truncate,		/* truncate */
+	NULL,			/* permission */
+	NULL			/* smap */
+};
+
+static struct file_operations fat_file_operations_readpage = {
+	NULL,			/* lseek - default */
+	fat_file_read,		/* read */
+	fat_file_write,		/* write */
+	NULL,			/* readdir - bad */
+	NULL,			/* select v2.0.x/poll v2.1.x - default */
+	NULL,			/* ioctl - default */
+	generic_file_mmap,	/* mmap */
+	NULL,			/* no special open is needed */
+	NULL,			/* release */
+	file_fsync		/* fsync */
+};
+
+struct inode_operations fat_file_inode_operations_readpage = {
+	&fat_file_operations_readpage,	/* default file operations */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	NULL,			/* readlink */
+	NULL,			/* follow_link */
+	fat_readpage,		/* readpage */
 	NULL,			/* writepage */
 	NULL,			/* bmap */
 	fat_truncate,		/* truncate */
@@ -277,7 +312,18 @@ ssize_t fat_file_read(
 	loff_t *ppos)
 {
 	struct inode *inode = filp->f_dentry->d_inode;
-	if (!MSDOS_I(inode)->i_binary)
+	if (MSDOS_SB(inode->i_sb)->cvf_format &&
+	    MSDOS_SB(inode->i_sb)->cvf_format->cvf_file_read)
+		return MSDOS_SB(inode->i_sb)->cvf_format
+			->cvf_file_read(filp,buf,count,ppos);
+
+	/*
+	 * MS-DOS filesystems with a blocksize > 512 may have blocks
+	 * spread over several hardware sectors (unaligned), which
+	 * is not something the generic routines can (or would want
+	 * to) handle).
+	 */
+	if (!MSDOS_I(inode)->i_binary || inode->i_sb->s_blocksize > 512)
 		return fat_file_read_text(filp, buf, count, ppos);
 	return generic_file_read(filp, buf, count, ppos);
 }
@@ -299,10 +345,17 @@ ssize_t fat_file_write(
 	struct buffer_head *bh;
 	int binary_mode = MSDOS_I(inode)->i_binary;
 
+	PRINTK(("fat_file_write: dentry=%p, inode=%p, ino=%ld\n",
+		filp->f_dentry, inode, inode->i_ino));
 	if (!inode) {
 		printk("fat_file_write: inode = NULL\n");
 		return -EINVAL;
 	}
+        if (MSDOS_SB(sb)->cvf_format &&
+	    MSDOS_SB(sb)->cvf_format->cvf_file_write)
+		return MSDOS_SB(sb)->cvf_format
+			->cvf_file_write(filp,buf,count,ppos);
+
 	/* S_ISLNK allows for UMSDOS. Should never happen for normal MSDOS */
 	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode)) {
 		printk("fat_file_write: mode = %07o\n",inode->i_mode);