----------------------------------------------
[...]
VFS: Insert root floppy disk to be loaded into ramdisk and press ENTER
RAMDISK: Ext2 filesystem found at block 0
RAMDISK: Loading 4096 blocks [3 disk(s)] into ram disk... done.
Please insert disk #2 and press ENTER
Loading disk #2... done.
Please insert disk #3 and press ENTER
Loading disk #3... done.
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 28k freed
[...]
----------------------------------------------
To create a disk set from a filesystem on say /dev/hda1, simply do
# cat /dev/hda1 | split -b 1440k - disk-
# cat disk-aa > /dev/fd0
-change floppy-
# cat disk-ab > /dev/fd0
...and so on.
[On the "To do" list: add similar support for compressed fs images.]
Paul.
---------------------------------
--- linux/drivers/block/rd.c~ Tue Dec 2 05:34:11 1997
+++ linux/drivers/block/rd.c Sun Mar 8 13:09:22 1998
@@ -35,6 +35,9 @@
*
* 4/25/96 : Made ramdisk size a parameter (default is now 4MB)
* - Chad Page
+ *
+ * Add support for fs images split across >1 disk, Paul Gortmaker, Mar '98
+ *
*/
#include <linux/config.h>
@@ -344,7 +347,6 @@
struct ext2_super_block *ext2sb;
struct romfs_super_block *romfsb;
int nblocks = -1;
- int max_blocks;
unsigned char *buf;
buf = kmalloc(size, GFP_KERNEL);
@@ -423,17 +425,6 @@
fp->f_op->llseek(fp, start_block * BLOCK_SIZE, 0);
fp->f_pos = start_block * BLOCK_SIZE;
- if ((nblocks > 0) && blk_size[MAJOR(device)]) {
- max_blocks = blk_size[MAJOR(device)][MINOR(device)];
- max_blocks -= start_block;
- if (nblocks > max_blocks) {
- printk(KERN_NOTICE
- "RAMDISK: Restricting filesystem size "
- "from %d to %d blocks.\n",
- nblocks, max_blocks);
- nblocks = max_blocks;
- }
- }
kfree(buf);
return nblocks;
}
@@ -451,6 +442,7 @@
int nblocks, i;
char *buf;
unsigned short rotate = 0;
+ unsigned short devblocks = 0;
char rotator[4] = { '|' , '/' , '-' , '\\' };
ram_device = MKDEV(MAJOR_NR, 0);
@@ -508,8 +500,31 @@
goto done;
}
- printk(KERN_NOTICE "RAMDISK: Loading %d blocks into ram disk... ", nblocks);
+ if (blk_size[MAJOR(device)])
+ devblocks = blk_size[MAJOR(device)][MINOR(device)];
+
+ if (devblocks == 0) {
+ printk(KERN_ERR "RAMDISK: could not determine device size\n");
+ goto done;
+ }
+
+ printk(KERN_NOTICE "RAMDISK: Loading %d blocks [%d disk(s)] into ram disk... ", nblocks, nblocks/devblocks+1);
for (i=0; i < nblocks; i++) {
+ if (i && (i % devblocks == 0)) {
+ printk("done.\n");
+ rotate = 0;
+ invalidate_buffers(device);
+ if (infile.f_op->release)
+ infile.f_op->release(&inode, &infile);
+ printk("Please insert disk #%d and press ENTER\n", i/devblocks+1);
+ wait_for_keypress();
+ if (blkdev_open(&inode, &infile) != 0) {
+ printk("Error opening disk.\n");
+ return;
+ }
+ infile.f_pos = 0;
+ printk("Loading disk #%d... ", i/devblocks+1);
+ }
infile.f_op->read(&infile, buf, BLOCK_SIZE, &infile.f_pos);
outfile.f_op->write(&outfile, buf, BLOCK_SIZE, &outfile.f_pos);
if (!(i % 16)) {
-
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