lustre/kernel_patches/patches/dev_read_only_2.4.20-rh.patch

   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(+)
   5
   6 --- kernel-2.4.20-6chaos_18_7/drivers/block/blkpg.c~dev_read_only_2.4.20-rh     2003-05-15 21:12:48.000000000 -0600
   7 +++ kernel-2.4.20-6chaos_18_7-braam/drivers/block/blkpg.c       2003-07-12 15:10:31.000000000 -0600
   8 @@ -297,3 +297,38 @@ int blk_ioctl(kdev_t dev, unsigned int c
   9  }
  10
  11  EXPORT_SYMBOL(blk_ioctl);
  12 +
  13 +#define NUM_DEV_NO_WRITE 16
  14 +static int dev_no_write[NUM_DEV_NO_WRITE];
  15 +
  16 +/*
  17 + * Debug code for turning block devices "read-only" (will discard writes
  18 + * silently).  This is for filesystem crash/recovery testing.
  19 + */
  20 +void dev_set_rdonly(kdev_t dev, int no_write)
  21 +{
  22 +       if (dev) {
  23 +               printk(KERN_WARNING "Turning device %s read-only\n",
  24 +                      bdevname(dev));
  25 +               dev_no_write[no_write] = 0xdead0000 + dev;
  26 +       }
  27 +}
  28 +
  29 +int dev_check_rdonly(kdev_t dev) {
  30 +       int i;
  31 +
  32 +       for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
  33 +               if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
  34 +                   dev == (dev_no_write[i] & 0xffff))
  35 +                       return 1;
  36 +       }
  37 +       return 0;
  38 +}
  39 +
  40 +void dev_clear_rdonly(int no_write) {
  41 +       dev_no_write[no_write] = 0;
  42 +}
  43 +
  44 +EXPORT_SYMBOL(dev_set_rdonly);
  45 +EXPORT_SYMBOL(dev_check_rdonly);
  46 +EXPORT_SYMBOL(dev_clear_rdonly);
  47 --- kernel-2.4.20-6chaos_18_7/drivers/block/loop.c~dev_read_only_2.4.20-rh      2003-05-15 21:12:50.000000000 -0600
  48 +++ kernel-2.4.20-6chaos_18_7-braam/drivers/block/loop.c        2003-07-12 15:10:31.000000000 -0600
  49 @@ -491,6 +491,9 @@ static int loop_make_request(request_que
  50         spin_unlock_irq(&lo->lo_lock);
  51
  52         if (rw == WRITE) {
  53 +               if (dev_check_rdonly(rbh->b_rdev))
  54 +                       goto err;
  55 +
  56                 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
  57                         goto err;
  58         } else if (rw == READA) {
  59 --- kernel-2.4.20-6chaos_18_7/drivers/ide/ide-disk.c~dev_read_only_2.4.20-rh    2003-05-15 21:13:09.000000000 -0600
  60 +++ kernel-2.4.20-6chaos_18_7-braam/drivers/ide/ide-disk.c      2003-07-12 15:12:03.000000000 -0600
  61 @@ -371,6 +371,11 @@ ide_startstop_t __ide_do_rw_disk (ide_dr
  62         if (driver_blocked)
  63                 panic("Request while ide driver is blocked?");
  64
  65 +       if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
  66 +               ide_end_request(1, HWGROUP(drive));
  67 +               return ide_stopped;
  68 +       }
  69 +
  70         if (IDE_CONTROL_REG)
  71                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
  72
  73
  74 _