smash the HEAD with the contents of b_cmd. HEAD_PRE_CMD_SMASH and

[fs/lustre-release.git] / lustre / kernel_patches / patches / dev_read_only_2.6.0.patch

diff --git a/lustre/kernel_patches/patches/dev_read_only_2.6.0.patch b/lustre/kernel_patches/patches/dev_read_only_2.6.0.patch
new file mode 100644 (file)
index 0000000..9639f28
--- /dev/null
+++ b/lustre/kernel_patches/patches/dev_read_only_2.6.0.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