X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fkernel_patches%2Fpatches%2Fdev_read_only-2.6-suse.patch;fp=lustre%2Fkernel_patches%2Fpatches%2Fdev_read_only-2.6-suse.patch;h=9639f28126da5b5e2232ee364d4ceed953b12379;hb=3de901fceee79de12a31428bcc6ba3a00f10d1fe;hp=0000000000000000000000000000000000000000;hpb=94019f04d0103e90fd12f041763da20518308882;p=fs%2Flustre-release.git

diff --git a/lustre/kernel_patches/patches/dev_read_only-2.6-suse.patch b/lustre/kernel_patches/patches/dev_read_only-2.6-suse.patch
new file mode 100644
index 0000000..9639f28
--- /dev/null
+++ b/lustre/kernel_patches/patches/dev_read_only-2.6-suse.patch
@@ -0,0 +1,81 @@
+ drivers/block/ll_rw_blk.c |   49 ++++++++++++++++++++++++++++++++++++++++++++++
+ include/linux/blkdev.h    |    1 
+ 2 files changed, 50 insertions(+)
+
+Index: linux-2.6.0/drivers/block/ll_rw_blk.c
+===================================================================
+--- linux-2.6.0.orig/drivers/block/ll_rw_blk.c	2004-01-04 15:27:35.000000000 +0300
++++ linux-2.6.0/drivers/block/ll_rw_blk.c	2004-01-07 17:35:57.000000000 +0300
+@@ -2298,6 +2298,13 @@
+ 		if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))
+ 			goto end_io;
+ 
++		/* this is cfs's dev_rdonly check */
++		if (bio->bi_rw == WRITE &&
++				dev_check_rdonly(bio->bi_bdev->bd_dev)) {
++			bio_endio(bio, bio->bi_size, 0);
++			break;
++		}
++
+ 		/*
+ 		 * If this device has partitions, remap block n
+ 		 * of partition p to block n+start(p) of the disk.
+@@ -2805,6 +2812,58 @@
+ 	*ioc2 = temp;
+ }
+ 
++#define MAX_RDONLY_DEVS		16
++
++static dev_t rdonly_devs[MAX_RDONLY_DEVS] = {0, };
++
++/*
++ * Debug code for turning block devices "read-only" (will discard writes
++ * silently).  This is for filesystem crash/recovery testing.
++ */
++void dev_set_rdonly(struct block_device *bdev, int no_write)
++{
++	if (no_write >= MAX_RDONLY_DEVS) {
++		printk(KERN_ALERT "%s:%d illegal arg %d (max %d)\n",
++				__FILE__, __LINE__, no_write, MAX_RDONLY_DEVS);
++		return;
++	}
++
++	if (bdev) {
++		printk(KERN_WARNING "Turning device %s read-only at %d\n",
++				bdev->bd_disk ? bdev->bd_disk->disk_name : "?",
++				no_write);
++		rdonly_devs[no_write] = bdev->bd_dev;
++	}
++}
++
++void dev_clear_rdonly(int no_write)
++{
++	if (no_write >= MAX_RDONLY_DEVS) {
++		printk(KERN_ALERT "%s:%d illegal arg %d (max %d)\n",
++				__FILE__, __LINE__, no_write, MAX_RDONLY_DEVS);
++		return;
++	}
++
++	if (rdonly_devs[no_write] == 0)
++		return;
++	
++	printk(KERN_WARNING "Clearing read-only at %d\n", no_write);
++	rdonly_devs[no_write] = 0;
++}
++
++int dev_check_rdonly(dev_t dev)
++{
++	int i;
++
++	for (i = 0; i < MAX_RDONLY_DEVS; i++)
++		if (rdonly_devs[i] == dev)
++			return 1;
++	return 0;
++}
++
++EXPORT_SYMBOL(dev_set_rdonly);
++EXPORT_SYMBOL(dev_clear_rdonly);
++EXPORT_SYMBOL(dev_check_rdonly);
+ 
+ /*
+  * sysfs parts below