1 drivers/block/blkpg.c | 36 ++++++++++++++++++++++++++++++++++++
2 drivers/block/loop.c | 3 +++
3 drivers/ide/ide-disk.c | 4 ++++
4 3 files changed, 43 insertions(+)
6 Index: linux-2.4.19/drivers/block/blkpg.c
7 ===================================================================
8 --- linux-2.4.19.orig/drivers/block/blkpg.c 2002-08-02 20:39:43.000000000 -0400
9 +++ linux-2.4.19/drivers/block/blkpg.c 2004-04-23 18:24:40.000000000 -0400
13 EXPORT_SYMBOL(blk_ioctl);
15 +#define NUM_DEV_NO_WRITE 16
16 +static int dev_no_write[NUM_DEV_NO_WRITE];
18 + * Debug code for turning block devices "read-only" (will discard writes
19 + * silently). This is for filesystem crash/recovery testing.
21 +void dev_set_rdonly(kdev_t dev, int no_write)
24 + printk(KERN_WARNING "Turning device %s read-only\n",
26 + dev_no_write[no_write] = 0xdead0000 + dev;
30 +int dev_check_rdonly(kdev_t dev) {
33 + for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
34 + if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
35 + dev == (dev_no_write[i] & 0xffff))
41 +void dev_clear_rdonly(int no_write) {
42 + dev_no_write[no_write] = 0;
45 +EXPORT_SYMBOL(dev_set_rdonly);
46 +EXPORT_SYMBOL(dev_check_rdonly);
47 +EXPORT_SYMBOL(dev_clear_rdonly);
48 Index: linux-2.4.19/drivers/block/loop.c
49 ===================================================================
50 --- linux-2.4.19.orig/drivers/block/loop.c 2004-04-23 17:53:56.000000000 -0400
51 +++ linux-2.4.19/drivers/block/loop.c 2004-04-23 18:23:16.000000000 -0400
53 spin_unlock_irq(&lo->lo_lock);
56 + if (dev_check_rdonly(rbh->b_rdev))
59 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
61 } else if (rw == READA) {
62 Index: linux-2.4.19/drivers/ide/ide-disk.c
63 ===================================================================
64 --- linux-2.4.19.orig/drivers/ide/ide-disk.c 2004-04-23 17:53:51.000000000 -0400
65 +++ linux-2.4.19/drivers/ide/ide-disk.c 2004-04-23 18:23:16.000000000 -0400
68 static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
70 + if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
71 + ide_end_request(1, HWGROUP(drive));
75 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);