1 Index: linux-2.4.20-rh/drivers/block/blkpg.c
2 ===================================================================
3 --- linux-2.4.20-rh.orig/drivers/block/blkpg.c 2003-07-22 16:02:29.000000000 +0800
4 +++ linux-2.4.20-rh/drivers/block/blkpg.c 2003-12-09 17:33:09.000000000 +0800
8 EXPORT_SYMBOL(blk_ioctl);
10 +#define NUM_DEV_NO_WRITE 16
11 +static int dev_no_write[NUM_DEV_NO_WRITE];
14 + * Debug code for turning block devices "read-only" (will discard writes
15 + * silently). This is for filesystem crash/recovery testing.
17 +void dev_set_rdonly(kdev_t dev, int no_write)
20 + printk(KERN_WARNING "Turning device %s read-only\n",
22 + dev_no_write[no_write] = 0xdead0000 + dev;
26 +int dev_check_rdonly(kdev_t dev) {
29 + for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
30 + if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
31 + dev == (dev_no_write[i] & 0xffff))
37 +void dev_clear_rdonly(int no_write) {
38 + dev_no_write[no_write] = 0;
41 +EXPORT_SYMBOL(dev_set_rdonly);
42 +EXPORT_SYMBOL(dev_check_rdonly);
43 +EXPORT_SYMBOL(dev_clear_rdonly);
44 Index: linux-2.4.20-rh/drivers/block/ll_rw_blk.c
45 ===================================================================
46 --- linux-2.4.20-rh.orig/drivers/block/ll_rw_blk.c 2003-07-22 16:02:34.000000000 +0800
47 +++ linux-2.4.20-rh/drivers/block/ll_rw_blk.c 2003-12-09 17:39:38.000000000 +0800
48 @@ -1183,6 +1183,10 @@
52 + if ((rw & WRITE)&&(dev_check_rdonly(bh->b_rdev))) {
53 + bh->b_end_io(bh, 0);
56 } while (q->make_request_fn(q, rw, bh));