1 drivers/block/blkpg.c | 35 +++++++++++++++++++++++++++++++++++
2 drivers/block/loop.c | 3 +++
3 drivers/ide/ide-disk.c | 5 +++++
4 3 files changed, 43 insertions(+)
6 Index: linux-2.4.21-chaos/drivers/block/blkpg.c
7 ===================================================================
8 --- linux-2.4.21-chaos.orig/drivers/block/blkpg.c 2003-09-19 03:49:42.000000000 +0400
9 +++ linux-2.4.21-chaos/drivers/block/blkpg.c 2003-12-12 16:17:49.000000000 +0300
12 #endif /* CONFIG_IA64 */
15 +#define NUM_DEV_NO_WRITE 16
16 +static int dev_no_write[NUM_DEV_NO_WRITE];
19 + * Debug code for turning block devices "read-only" (will discard writes
20 + * silently). This is for filesystem crash/recovery testing.
22 +void dev_set_rdonly(kdev_t dev, int no_write)
25 + printk(KERN_WARNING "Turning device %s read-only\n",
27 + dev_no_write[no_write] = 0xdead0000 + dev;
31 +int dev_check_rdonly(kdev_t dev) {
34 + for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
35 + if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
36 + dev == (dev_no_write[i] & 0xffff))
42 +void dev_clear_rdonly(int no_write) {
43 + dev_no_write[no_write] = 0;
46 +EXPORT_SYMBOL(dev_set_rdonly);
47 +EXPORT_SYMBOL(dev_check_rdonly);
48 +EXPORT_SYMBOL(dev_clear_rdonly);
49 Index: linux-2.4.21-chaos/drivers/block/loop.c
50 ===================================================================
51 --- linux-2.4.21-chaos.orig/drivers/block/loop.c 2003-09-19 03:49:42.000000000 +0400
52 +++ linux-2.4.21-chaos/drivers/block/loop.c 2003-12-12 16:17:49.000000000 +0300
54 spin_unlock_irq(&lo->lo_lock);
57 + if (dev_check_rdonly(rbh->b_rdev))
60 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
62 } else if (rw == READA) {
63 Index: linux-2.4.21-chaos/drivers/ide/ide-disk.c
64 ===================================================================
65 --- linux-2.4.21-chaos.orig/drivers/ide/ide-disk.c 2003-07-15 02:08:42.000000000 +0400
66 +++ linux-2.4.21-chaos/drivers/ide/ide-disk.c 2003-12-12 16:17:49.000000000 +0300
69 panic("Request while ide driver is blocked?");
71 + if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
72 + ide_end_request(drive, 1);
77 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);