add patch dev_2.4.20

diff --git a/lustre/kernel_patches/patches/dev_read_only_2.4.20.patch b/lustre/kernel_patches/patches/dev_read_only_2.4.20.patch
new file mode 100644 (file)
index 0000000..55057d9
--- /dev/null
+++ b/lustre/kernel_patches/patches/dev_read_only_2.4.20.patch
@@ -0,0 +1,77 @@
+
+
+
+ drivers/block/blkpg.c  |   35 +++++++++++++++++++++++++++++++++++
+ drivers/block/loop.c   |    3 +++
+ drivers/ide/ide-disk.c |    5 ++++-
+ 3 files changed, 42 insertions(+), 1 deletion(-)
+
+--- rh-2.4.20/drivers/block/blkpg.c~dev_read_only_2.4.20       2003-04-11 14:05:03.000000000 +0800
++++ rh-2.4.20-root/drivers/block/blkpg.c       2003-04-12 13:11:31.000000000 +0800
+@@ -297,3 +297,38 @@ int blk_ioctl(kdev_t dev, unsigned int c
+ }
+ 
+ EXPORT_SYMBOL(blk_ioctl);
++
++#define NUM_DEV_NO_WRITE 16
++static int dev_no_write[NUM_DEV_NO_WRITE];
++
++/*
++ * Debug code for turning block devices "read-only" (will discard writes
++ * silently).  This is for filesystem crash/recovery testing.
++ */
++void dev_set_rdonly(kdev_t dev, int no_write)
++{
++      if (dev) {
++              printk(KERN_WARNING "Turning device %s read-only\n",
++                     bdevname(dev));
++              dev_no_write[no_write] = 0xdead0000 + dev;
++      }
++}
++
++int dev_check_rdonly(kdev_t dev) {
++      int i;
++
++      for (i = 0; i < NUM_DEV_NO_WRITE; i++) {
++              if ((dev_no_write[i] & 0xffff0000) == 0xdead0000 &&
++                  dev == (dev_no_write[i] & 0xffff))
++                      return 1;
++      }
++      return 0;
++}
++
++void dev_clear_rdonly(int no_write) {
++      dev_no_write[no_write] = 0;
++}
++
++EXPORT_SYMBOL(dev_set_rdonly);
++EXPORT_SYMBOL(dev_check_rdonly);
++EXPORT_SYMBOL(dev_clear_rdonly);
+--- rh-2.4.20/drivers/block/loop.c~dev_read_only_2.4.20        2003-04-11 14:05:08.000000000 +0800
++++ rh-2.4.20-root/drivers/block/loop.c        2003-04-12 13:11:31.000000000 +0800
+@@ -491,6 +491,9 @@ static int loop_make_request(request_que
+       spin_unlock_irq(&lo->lo_lock);
+ 
+       if (rw == WRITE) {
++              if (dev_check_rdonly(rbh->b_rdev))
++                      goto err;
++
+               if (lo->lo_flags & LO_FLAGS_READ_ONLY)
+                       goto err;
+       } else if (rw == READA) {
+--- rh-2.4.20/drivers/ide/ide-disk.c~dev_read_only_2.4.20      2003-04-11 14:04:53.000000000 +0800
++++ rh-2.4.20-root/drivers/ide/ide-disk.c      2003-04-12 13:14:48.000000000 +0800
+@@ -381,7 +381,10 @@ static ide_startstop_t do_rw_disk (ide_d
+       if (IS_PDC4030_DRIVE)
+               return promise_rw_disk(drive, rq, block);
+ #endif /* CONFIG_BLK_DEV_PDC4030 */
+-
++      if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
++              ide_end_request(1, HWGROUP(drive));
++              return ide_stopped;
++      }
+       if (IDE_CONTROL_REG)
+               hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
+ 
+
+_