4 drivers/block/blkpg.c | 35 +++++++++++++++++++++++++++++++++++
5 drivers/block/loop.c | 3 +++
6 drivers/ide/ide-disk.c | 5 ++++-
7 3 files changed, 42 insertions(+), 1 deletion(-)
9 --- rh-2.4.20/drivers/block/blkpg.c~dev_read_only_2.4.20 2003-04-11 14:05:03.000000000 +0800
10 +++ rh-2.4.20-root/drivers/block/blkpg.c 2003-04-12 13:11:31.000000000 +0800
11 @@ -297,3 +297,38 @@ int blk_ioctl(kdev_t dev, unsigned int c
14 EXPORT_SYMBOL(blk_ioctl);
16 +#define NUM_DEV_NO_WRITE 16
17 +static int dev_no_write[NUM_DEV_NO_WRITE];
20 + * Debug code for turning block devices "read-only" (will discard writes
21 + * silently). This is for filesystem crash/recovery testing.
23 +void dev_set_rdonly(kdev_t dev, int no_write)
26 + printk(KERN_WARNING "Turning device %s read-only\n",
28 + dev_no_write[no_write] = 0xdead0000 + dev;
32 +int dev_check_rdonly(kdev_t dev) {
35 + for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
36 + if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
37 + dev == (dev_no_write[i] & 0xffff))
43 +void dev_clear_rdonly(int no_write) {
44 + dev_no_write[no_write] = 0;
47 +EXPORT_SYMBOL(dev_set_rdonly);
48 +EXPORT_SYMBOL(dev_check_rdonly);
49 +EXPORT_SYMBOL(dev_clear_rdonly);
50 --- rh-2.4.20/drivers/block/loop.c~dev_read_only_2.4.20 2003-04-11 14:05:08.000000000 +0800
51 +++ rh-2.4.20-root/drivers/block/loop.c 2003-04-12 13:11:31.000000000 +0800
52 @@ -491,6 +491,9 @@ static int loop_make_request(request_que
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 --- rh-2.4.20/drivers/ide/ide-disk.c~dev_read_only_2.4.20 2003-04-11 14:04:53.000000000 +0800
63 +++ rh-2.4.20-root/drivers/ide/ide-disk.c 2003-04-12 13:14:48.000000000 +0800
64 @@ -381,7 +381,10 @@ static ide_startstop_t do_rw_disk (ide_d
66 return promise_rw_disk(drive, rq, block);
67 #endif /* CONFIG_BLK_DEV_PDC4030 */
69 + if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
70 + ide_end_request(1, HWGROUP(drive));
74 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);