lustre/kernel_patches/patches/dev_read_only-suse-2.4.19.patch

   1  drivers/block/blkpg.c  |   36 ++++++++++++++++++++++++++++++++++++
   2  drivers/block/loop.c   |    3 +++
   3  drivers/ide/ide-disk.c |    4 ++++
   4  3 files changed, 43 insertions(+)
   5
   6 Index: linux-2.4.19/drivers/block/blkpg.c
   7 ===================================================================
   8 --- linux-2.4.19.orig/drivers/block/blkpg.c     2002-08-02 20:39:43.000000000 -0400
   9 +++ linux-2.4.19/drivers/block/blkpg.c  2004-04-23 18:24:40.000000000 -0400
  10 @@ -296,3 +296,37 @@
  11  }
  12
  13  EXPORT_SYMBOL(blk_ioctl);
  14 +
  15 +#define NUM_DEV_NO_WRITE 16
  16 +static int dev_no_write[NUM_DEV_NO_WRITE];
  17 +/*
  18 + * Debug code for turning block devices "read-only" (will discard writes
  19 + * silently).  This is for filesystem crash/recovery testing.
  20 + */
  21 +void dev_set_rdonly(kdev_t dev, int no_write)
  22 +{
  23 +      if (dev) {
  24 +              printk(KERN_WARNING "Turning device %s read-only\n",
  25 +                     bdevname(dev));
  26 +              dev_no_write[no_write] = 0xdead0000 + dev;
  27 +      }
  28 +}
  29 +
  30 +int dev_check_rdonly(kdev_t dev) {
  31 +      int i;
  32 +
  33 +      for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
  34 +      if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
  35 +              dev == (dev_no_write[i] & 0xffff))
  36 +              return 1;
  37 +      }
  38 +      return 0;
  39 +}
  40 +
  41 +void dev_clear_rdonly(int no_write) {
  42 +      dev_no_write[no_write] = 0;
  43 +}
  44 +
  45 +EXPORT_SYMBOL(dev_set_rdonly);
  46 +EXPORT_SYMBOL(dev_check_rdonly);
  47 +EXPORT_SYMBOL(dev_clear_rdonly);
  48 Index: linux-2.4.19/drivers/block/loop.c
  49 ===================================================================
  50 --- linux-2.4.19.orig/drivers/block/loop.c      2004-04-23 17:53:56.000000000 -0400
  51 +++ linux-2.4.19/drivers/block/loop.c   2004-04-23 18:23:16.000000000 -0400
  52 @@ -478,6 +478,9 @@
  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 Index: linux-2.4.19/drivers/ide/ide-disk.c
  63 ===================================================================
  64 --- linux-2.4.19.orig/drivers/ide/ide-disk.c    2004-04-23 17:53:51.000000000 -0400
  65 +++ linux-2.4.19/drivers/ide/ide-disk.c 2004-04-23 18:23:16.000000000 -0400
  66 @@ -558,6 +558,10 @@
  67   */
  68  static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
  69  {
  70 +       if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
  71 +               ide_end_request(1, HWGROUP(drive));
  72 +               return ide_stopped;
  73 +       }
  74         if (IDE_CONTROL_REG)
  75                 OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
  76