Move xen patchset to new version's subdir.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.suse / dm-table-change-mode-to-ro

diff --git a/src/patches/suse-2.6.27.31/patches.suse/dm-table-change-mode-to-ro b/src/patches/suse-2.6.27.31/patches.suse/dm-table-change-mode-to-ro
new file mode 100644 (file)
index 0000000..889f351
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.suse/dm-table-change-mode-to-ro
@@ -0,0 +1,37 @@
+From: Hannes Reinecke <hare@suse.de>
+Subject: Switch device-mapper tables to READ-WRITE
+References: bnc#440959
+
+Switching a device-mapper table to READ-ONLY works quite well, but
+we can't switch back to READ-WRITE as this change will be masked out.
+So get rid of this masking and use the flags directly.
+And implement a fallback to automatically switch to read-only.
+
+Signed-off-by: Hannes Reinecke <hare@suse.de>
+
+--- linux-2.6.27/drivers/md/dm-table.c.orig    2009-02-02 13:09:06.000000000 +0100
++++ linux-2.6.27/drivers/md/dm-table.c 2009-02-02 14:03:03.000000000 +0100
+@@ -423,9 +423,13 @@ static int upgrade_mode(struct dm_dev *d
+ 
+       dd_copy = *dd;
+ 
+-      dd->mode |= new_mode;
++      dd->mode = new_mode;
+       dd->bdev = NULL;
+       r = open_dev(dd, dev, md);
++      if (r == -EROFS) {
++              dd->mode &= ~FMODE_WRITE;
++              r = open_dev(dd, dev, md);
++      }
+       if (!r)
+               close_dev(&dd_copy, md);
+       else
+@@ -487,7 +491,7 @@ static int __table_get_device(struct dm_
+               atomic_set(&dd->count, 0);
+               list_add(&dd->list, &t->devices);
+ 
+-      } else if (dd->mode != (mode | dd->mode)) {
++      } else if (dd->mode != mode) {
+               r = upgrade_mode(dd, mode, t->md);
+               if (r)
+                       return r;