From: wangdi <wangdi>
Date: Wed, 16 Apr 2003 12:51:46 +0000 (+0000)
Subject: add patch dev_2.4.20
X-Git-Tag: v1_7_110~1^13~212
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=1054b49b37f961b68535c3e23a3ca3400dd9dc31;p=fs%2Flustre-release.git

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
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);
+ 
+
+_