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-fix-sub-block-zeroing-for-preallocated-writes

diff --git a/src/patches/suse-2.6.27.31/patches.fixes/ext4-fix-sub-block-zeroing-for-preallocated-writes b/src/patches/suse-2.6.27.31/patches.fixes/ext4-fix-sub-block-zeroing-for-preallocated-writes
new file mode 100644 (file)
index 0000000..e777a45
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.fixes/ext4-fix-sub-block-zeroing-for-preallocated-writes
@@ -0,0 +1,54 @@
+From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+Date: Wed, 13 May 2009 22:36:58 +0000 (-0400)
+Subject: ext4: Fix sub-block zeroing for writes into preallocated extents
+Patch-mainline: 2.6.30
+Git-commit: 9c1ee184a30394e54165fa4c15923cabd952c106
+References: bnc#503161
+
+ext4: Fix sub-block zeroing for writes into preallocated extents
+
+We need to mark the buffer_head mapping preallocated space as new
+during write_begin. Otherwise we don't zero out the page cache content
+properly for a partial write. This will cause file corruption with
+preallocation.
+
+Now that we mark the buffer_head new we also need to have a valid
+buffer_head blocknr so that unmap_underlying_metadata() unmaps the
+correct block.
+
+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/extents.c |    2 ++
+ fs/ext4/inode.c   |    7 +++++++
+ 2 files changed, 9 insertions(+)
+
+--- a/fs/ext4/extents.c
++++ b/fs/ext4/extents.c
+@@ -2664,6 +2664,8 @@ int ext4_ext_get_blocks(handle_t *handle
+                               if (allocated > max_blocks)
+                                       allocated = max_blocks;
+                               set_buffer_unwritten(bh_result);
++                              bh_result->b_bdev = inode->i_sb->s_bdev;
++                              bh_result->b_blocknr = newblock;
+                               goto out2;
+                       }
+ 
+--- a/fs/ext4/inode.c
++++ b/fs/ext4/inode.c
+@@ -2220,6 +2220,13 @@ static int ext4_da_get_block_prep(struct
+               set_buffer_delay(bh_result);
+       } else if (ret > 0) {
+               bh_result->b_size = (ret << inode->i_blkbits);
++              /*
++               * With sub-block writes into unwritten extents
++               * we also need to mark the buffer as new so that
++               * the unwritten parts of the buffer gets correctly zeroed.
++               */
++              if (buffer_unwritten(bh_result))
++                      set_buffer_new(bh_result);
+               ret = 0;
+       }
+