From d8a5c5362cb37896c8ba0ccc84f2bfe15febb9dd Mon Sep 17 00:00:00 2001
From: mmex <mmex>
Date: Mon, 19 May 2003 17:07:44 +0000
Subject: [PATCH] - Update kernel patchs to work on hp4_pnnl6.  Note that a new
 branch of dev_read_only was made.  dev_read_only_hp can not longer be used
 because multiple other series (not the hp ones) now use it and regularly
 update it in conflicting ways.

---
 .../patches/dev_read_only_hp_2.4.20.patch          | 77 ++++++++++++++++++++++
 .../kernel_patches/pc/dev_read_only_hp_2.4.20.pc   |  3 +
 2 files changed, 80 insertions(+)
 create mode 100644 lustre/kernel_patches/patches/dev_read_only_hp_2.4.20.patch
 create mode 100644 lustre/kernel_patches/pc/dev_read_only_hp_2.4.20.pc

diff --git a/lustre/kernel_patches/patches/dev_read_only_hp_2.4.20.patch b/lustre/kernel_patches/patches/dev_read_only_hp_2.4.20.patch
new file mode 100644
index 0000000..60081db
--- /dev/null
+++ b/lustre/kernel_patches/patches/dev_read_only_hp_2.4.20.patch
@@ -0,0 +1,77 @@
+ drivers/block/blkpg.c  |   36 ++++++++++++++++++++++++++++++++++++
+ drivers/block/loop.c   |    3 +++
+ drivers/ide/ide-disk.c |    4 ++++
+ 3 files changed, 43 insertions(+)
+
+--- linux/drivers/block/blkpg.c~dev_read_only_hp_2.4.20	Mon May 19 07:07:52 2003
++++ linux-mmonroe/drivers/block/blkpg.c	Mon May 19 07:37:22 2003
+@@ -310,6 +310,42 @@ 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);
++
++
+ /**
+  * get_last_sector()
+  *  
+--- linux/drivers/block/loop.c~dev_read_only_hp_2.4.20	Thu Nov 28 15:53:12 2002
++++ linux-mmonroe/drivers/block/loop.c	Mon May 19 07:28:29 2003
+@@ -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/drivers/ide/ide-disk.c~dev_read_only_hp_2.4.20	Thu Nov 28 15:53:13 2002
++++ linux-mmonroe/drivers/ide/ide-disk.c	Mon May 19 07:28:29 2003
+@@ -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);
+ 
+
+_
diff --git a/lustre/kernel_patches/pc/dev_read_only_hp_2.4.20.pc b/lustre/kernel_patches/pc/dev_read_only_hp_2.4.20.pc
new file mode 100644
index 0000000..4760ad1
--- /dev/null
+++ b/lustre/kernel_patches/pc/dev_read_only_hp_2.4.20.pc
@@ -0,0 +1,3 @@
+drivers/block/blkpg.c
+drivers/block/loop.c
+drivers/ide/ide-disk.c
-- 
1.8.3.1