From a971a3ef830b273a2448dec49a1ec206ed8fe962 Mon Sep 17 00:00:00 2001
From: wangdi <wangdi>
Date: Tue, 27 May 2003 11:15:16 +0000
Subject: [PATCH] rename dev_read_only_hp.patch dev_read_only_2.4.20.patch

---
 .../patches/dev_read_only_2.4.20.patch             | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 lustre/kernel_patches/patches/dev_read_only_2.4.20.patch

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
index 0000000..0d3476c
--- /dev/null
+++ b/lustre/kernel_patches/patches/dev_read_only_2.4.20.patch
@@ -0,0 +1,77 @@
+ drivers/block/blkpg.c  |   39 +++++++++++++++++++++++++++++++++++++++
+ drivers/block/loop.c   |    3 +++
+ drivers/ide/ide-disk.c |    4 ++++
+ 3 files changed, 46 insertions(+)
+
+--- linux-2.4.20/drivers/block/blkpg.c~dev_read_only_hp	2003-04-09 15:14:54.000000000 -0600
++++ linux-2.4.20-braam/drivers/block/blkpg.c	2003-04-09 15:37:02.000000000 -0600
+@@ -296,3 +296,42 @@ 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);
++
++
+--- linux-2.4.20/drivers/block/loop.c~dev_read_only_hp	2003-04-09 15:14:54.000000000 -0600
++++ linux-2.4.20-braam/drivers/block/loop.c	2003-04-09 15:37:02.000000000 -0600
+@@ -474,6 +474,9 @@ 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) {
+--- linux-2.4.20/drivers/ide/ide-disk.c~dev_read_only_hp	2003-04-09 15:14:54.000000000 -0600
++++ linux-2.4.20-braam/drivers/ide/ide-disk.c	2003-04-09 15:37:02.000000000 -0600
+@@ -558,6 +558,10 @@ static ide_startstop_t lba_48_rw_disk (i
+  */
+ static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
+ {
++	if (rq->cmd == WRITE && dev_check_rdonly(rq->rq_dev)) {
++		ide_end_request(1, HWGROUP(drive));
++		return ide_stopped;
++	}
+ 	if (IDE_CONTROL_REG)
+ 		OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
+ 
+
+_
-- 
1.8.3.1