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Subject[RFC][PATCH] Allow compressed initial ramdisks to span multiple floppies
From
Hi all,

This is my first patch (and possibly post) to lkml, although I browse
the archives quite often. The patch allows a compressed ramdisk to
span multiple floppies. This is handy for installing modern distros
(YDL in my case) on a machine that can't boot from CD-ROM, where the
initial ramdisks are several meg in size. Obviously, I could
uncompress the ramdisk (which I have actually done) but writing 12 or
more floppies in this day and age make my toes curl.

Please CC me in any replies for a speedy response.

Cheers,

Leigh.
---
--- drivers/block/rd.c.orig Sun Apr 8 23:22:17 2001
+++ drivers/block/rd.c Mon Jul 16 16:27:56 2001
@@ -85,7 +85,7 @@
#define BUILD_CRAMDISK

void rd_load(void);
-static int crd_load(struct file *fp, struct file *outfp);
+static int crd_load(struct file *fp, struct file *outfp, kdev_t device, struct inode *inode);

#ifdef CONFIG_BLK_DEV_INITRD
static int initrd_users;
@@ -608,7 +608,7 @@

if (nblocks == 0) {
#ifdef BUILD_CRAMDISK
- if (crd_load(&infile, &outfile) == 0)
+ if (crd_load(&infile, &outfile, device, inode) == 0)
goto successful_load;
#else
printk(KERN_NOTICE
@@ -787,6 +786,8 @@
static int exit_code;
static long bytes_out;
static struct file *crd_infp, *crd_outfp;
+static kdev_t crd_device;
+static struct inode *crd_inode;

#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())

@@ -839,7 +840,23 @@

insize = crd_infp->f_op->read(crd_infp, inbuf, INBUFSIZ,
&crd_infp->f_pos);
- if (insize == 0) return -1;
+ if (insize == 0) {
+ invalidate_buffers(crd_device);
+ if (crd_infp->f_op->release)
+ crd_infp->f_op->release(crd_inode, crd_infp);
+ printk("Please insert next disk and press ENTER\n");
+ wait_for_keypress();
+ if (blkdev_open(crd_inode, crd_infp) != 0) {
+ printk("Error opening disk.\n");
+ return -1;
+ }
+ crd_infp->f_pos = 0;
+ printk("Loading disk... ");
+ insize = crd_infp->f_op->read(crd_infp, inbuf, INBUFSIZ,
+ &crd_infp->f_pos);
+ }
+ if (insize == 0)
+ return -1;

inptr = 1;

@@ -874,7 +891,7 @@
}

static int __init
-crd_load(struct file * fp, struct file *outfp)
+crd_load(struct file * fp, struct file *outfp, kdev_t device, struct inode *inode)
{
int result;

@@ -887,6 +904,8 @@

crd_infp = fp;
crd_outfp = outfp;
+ crd_device = device;
+ crd_inode = inode;
inbuf = kmalloc(INBUFSIZ, GFP_KERNEL);
if (inbuf == 0) {
printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n");
-
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