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

   1
   2
   3
   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(-)
   8
   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
  12  }
  13
  14  EXPORT_SYMBOL(blk_ioctl);
  15 +
  16 +#define NUM_DEV_NO_WRITE 16
  17 +static int dev_no_write[NUM_DEV_NO_WRITE];
  18 +
  19 +/*
  20 + * Debug code for turning block devices "read-only" (will discard writes
  21 + * silently).  This is for filesystem crash/recovery testing.
  22 + */
  23 +void dev_set_rdonly(kdev_t dev, int no_write)
  24 +{
  25 +       if (dev) {
  26 +               printk(KERN_WARNING "Turning device %s read-only\n",
  27 +                      bdevname(dev));
  28 +               dev_no_write[no_write] = 0xdead0000 + dev;
  29 +       }
  30 +}
  31 +
  32 +int dev_check_rdonly(kdev_t dev) {
  33 +       int i;
  34 +
  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))
  38 +                       return 1;
  39 +       }
  40 +       return 0;
  41 +}
  42 +
  43 +void dev_clear_rdonly(int no_write) {
  44 +       dev_no_write[no_write] = 0;
  45 +}
  46 +
  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);
  54
  55         if (rw == WRITE) {
  56 +               if (dev_check_rdonly(rbh->b_rdev))
  57 +                       goto err;
  58 +
  59                 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
  60                         goto err;
  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
  65         if (IS_PDC4030_DRIVE)
  66                 return promise_rw_disk(drive, rq, block);
  67  #endif /* CONFIG_BLK_DEV_PDC4030 */
  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                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
  75
  76
  77 _