lustre/kernel_patches/patches/dev_read_only_2.4.20.patch

   1  drivers/block/blkpg.c  |   39 +++++++++++++++++++++++++++++++++++++++
   2  drivers/block/loop.c   |    3 +++
   3  drivers/ide/ide-disk.c |    4 ++++
   4  3 files changed, 46 insertions(+)
   5
   6 --- linux-2.4.20/drivers/block/blkpg.c~dev_read_only_hp 2003-04-09 15:14:54.000000000 -0600
   7 +++ linux-2.4.20-braam/drivers/block/blkpg.c    2003-04-09 15:37:02.000000000 -0600
   8 @@ -296,3 +296,42 @@ int blk_ioctl(kdev_t dev, unsigned int c
   9  }
  10
  11  EXPORT_SYMBOL(blk_ioctl);
  12 +
  13 +
  14 +
  15 +#define NUM_DEV_NO_WRITE 16
  16 +static int dev_no_write[NUM_DEV_NO_WRITE];
  17 +
  18 +/*
  19 + * Debug code for turning block devices "read-only" (will discard writes
  20 + * silently).  This is for filesystem crash/recovery testing.
  21 + */
  22 +void dev_set_rdonly(kdev_t dev, int no_write)
  23 +{
  24 +       if (dev) {
  25 +               printk(KERN_WARNING "Turning device %s read-only\n",
  26 +                      bdevname(dev));
  27 +               dev_no_write[no_write] = 0xdead0000 + dev;
  28 +       }
  29 +}
  30 +
  31 +int dev_check_rdonly(kdev_t dev) {
  32 +       int i;
  33 +
  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))
  37 +                       return 1;
  38 +       }
  39 +       return 0;
  40 +}
  41 +
  42 +void dev_clear_rdonly(int no_write) {
  43 +       dev_no_write[no_write] = 0;
  44 +}
  45 +
  46 +EXPORT_SYMBOL(dev_set_rdonly);
  47 +EXPORT_SYMBOL(dev_check_rdonly);
  48 +EXPORT_SYMBOL(dev_clear_rdonly);
  49 +
  50 +
  51 --- linux-2.4.20/drivers/block/loop.c~dev_read_only_hp  2003-04-09 15:14:54.000000000 -0600
  52 +++ linux-2.4.20-braam/drivers/block/loop.c     2003-04-09 15:37:02.000000000 -0600
  53 @@ -474,6 +474,9 @@ static int loop_make_request(request_que
  54         spin_unlock_irq(&lo->lo_lock);
  55
  56         if (rw == WRITE) {
  57 +               if (dev_check_rdonly(rbh->b_rdev))
  58 +                       goto err;
  59 +
  60                 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
  61                         goto err;
  62         } else if (rw == READA) {
  63 --- linux-2.4.20/drivers/ide/ide-disk.c~dev_read_only_hp        2003-04-09 15:14:54.000000000 -0600
  64 +++ linux-2.4.20-braam/drivers/ide/ide-disk.c   2003-04-09 15:37:02.000000000 -0600
  65 @@ -558,6 +558,10 @@ static ide_startstop_t lba_48_rw_disk (i
  66   */
  67  static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
  68  {
  69 +       if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
  70 +               ide_end_request(1, HWGROUP(drive));
  71 +               return ide_stopped;
  72 +       }
  73         if (IDE_CONTROL_REG)
  74                 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
  75
  76
  77 _