lustre/kernel_patches/patches/dev_read_only.patch

   1
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   4  0 files changed
   5
   6 --- linux-2.4.18-17.8.0/drivers/block/blkpg.c~dev_read_only     2002-12-06 14:52:29.000000000 -0800
   7 +++ linux-2.4.18-17.8.0-zab/drivers/block/blkpg.c       2002-12-06 14:52:29.000000000 -0800
   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 --- linux-2.4.18-17.8.0/drivers/block/loop.c~dev_read_only      2002-12-06 14:52:29.000000000 -0800
  48 +++ linux-2.4.18-17.8.0-zab/drivers/block/loop.c        2002-12-06 14:52:29.000000000 -0800
  49 @@ -491,6 +491,11 @@ static int loop_make_request(request_que
  50         spin_unlock_irq(&lo->lo_lock);
  51
  52         if (rw == WRITE) {
  53 +#ifdef CONFIG_DEV_RDONLY
  54 +               if (dev_check_rdonly(rbh->b_rdev))
  55 +                       goto err;
  56 +#endif
  57 +
  58                 if (lo->lo_flags & LO_FLAGS_READ_ONLY)
  59                         goto err;
  60         } else if (rw == READA) {
  61 --- linux-2.4.18-17.8.0/drivers/ide/ide-disk.c~dev_read_only    2002-12-06 14:52:29.000000000 -0800
  62 +++ linux-2.4.18-17.8.0-zab/drivers/ide/ide-disk.c      2002-12-06 14:52:29.000000000 -0800
  63 @@ -557,6 +557,12 @@ static ide_startstop_t lba_48_rw_disk (i
  64   */
  65  static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
  66  {
  67 +#ifdef CONFIG_DEV_RDONLY
  68 +       if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
  69 +               ide_end_request(1, HWGROUP(drive));
  70 +               return ide_stopped;
  71 +       }
  72 +#endif
  73         if (IDE_CONTROL_REG)
  74                 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
  75
  76
  77 _