Reenabled linux-xen, added patches for Xen Kernel Version 2.6.27.31,

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.fixes / ext4-use-a-fake-block-number-for-delayed-new-buffer_head

diff --git a/src/patches/suse-2.6.27.31/patches.fixes/ext4-use-a-fake-block-number-for-delayed-new-buffer_head b/src/patches/suse-2.6.27.31/patches.fixes/ext4-use-a-fake-block-number-for-delayed-new-buffer_head
new file mode 100644 (file)
index 0000000..1bb3069
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.fixes/ext4-use-a-fake-block-number-for-delayed-new-buffer_head
@@ -0,0 +1,43 @@
+From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+Date: Tue, 12 May 2009 18:40:37 +0000 (-0400)
+Subject: ext4: Use a fake block number for delayed new buffer_head
+Patch-mainline: 2.6.30-rc6
+Git-commit: 33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0
+References: bnc#503161
+
+ext4: Use a fake block number for delayed new buffer_head
+
+Use a very large unsigned number (~0xffff) as as the fake block number
+for the delayed new buffer. The VFS should never try to write out this
+number, but if it does, this will make it obvious.
+
+Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
+Acked-by: Jeff Mahoney <jeffm@suse.com>
+---
+
+ fs/ext4/inode.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/fs/ext4/inode.c
++++ b/fs/ext4/inode.c
+@@ -2190,6 +2190,10 @@ static int ext4_da_get_block_prep(struct
+                                 struct buffer_head *bh_result, int create)
+ {
+       int ret = 0;
++      sector_t invalid_block = ~((sector_t) 0xffff);
++
++      if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es))
++              invalid_block = ~0;
+ 
+       BUG_ON(create == 0);
+       BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize);
+@@ -2211,7 +2215,7 @@ static int ext4_da_get_block_prep(struct
+                       /* not enough space to reserve */
+                       return ret;
+ 
+-              map_bh(bh_result, inode->i_sb, 0);
++              map_bh(bh_result, inode->i_sb, invalid_block);
+               set_buffer_new(bh_result);
+               set_buffer_delay(bh_result);
+       } else if (ret > 0) {