Tue Jan 28 03:22:21 UTC 2014

1 files changed, 0 insertions, 63 deletions

diff --git a/kernels/linux-libre-xen/3.12-btrfs-relocate-csums.patch b/kernels/linux-libre-xen/3.12-btrfs-relocate-csums.patch
deleted file mode 100644
index 7209276ef..000000000
--- a/kernels/linux-libre-xen/3.12-btrfs-relocate-csums.patch
+++ /dev/null
@@ -1,63 +0,0 @@
-From 4577b014d1bc3db386da3246f625888fc48083a9 Mon Sep 17 00:00:00 2001
-From: Josef Bacik <jbacik@fusionio.com>
-Date: Fri, 27 Sep 2013 13:33:09 +0000
-Subject: Btrfs: relocate csums properly with prealloc extents
-
-A user reported a problem where they were getting csum errors when running a
-balance and running systemd's journal.  This is because systemd is awesome and
-fallocate()'s its log space and writes into it.  Unfortunately we assume that
-when we read in all the csums for an extent that they are sequential starting at
-the bytenr we care about.  This obviously isn't the case for prealloc extents,
-where we could have written to the middle of the prealloc extent only, which
-means the csum would be for the bytenr in the middle of our range and not the
-front of our range.  Fix this by offsetting the new bytenr we are logging to
-based on the original bytenr the csum was for.  With this patch I no longer see
-the csum errors I was seeing.  Thanks,
-
-Cc: stable@vger.kernel.org
-Reported-by: Chris Murphy <lists@colorremedies.com>
-Signed-off-by: Josef Bacik <jbacik@fusionio.com>
-Signed-off-by: Chris Mason <chris.mason@fusionio.com>
----
-diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
-index dec4f5a..0359eec 100644
---- a/fs/btrfs/relocation.c
-+++ b/fs/btrfs/relocation.c
-@@ -4472,6 +4472,7 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
- 	struct btrfs_root *root = BTRFS_I(inode)->root;
- 	int ret;
- 	u64 disk_bytenr;
-+	u64 new_bytenr;
- 	LIST_HEAD(list);
- 
- 	ordered = btrfs_lookup_ordered_extent(inode, file_pos);
-@@ -4483,13 +4484,24 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
- 	if (ret)
- 		goto out;
- 
--	disk_bytenr = ordered->start;
- 	while (!list_empty(&list)) {
- 		sums = list_entry(list.next, struct btrfs_ordered_sum, list);
- 		list_del_init(&sums->list);
- 
--		sums->bytenr = disk_bytenr;
--		disk_bytenr += sums->len;
-+		/*
-+		 * We need to offset the new_bytenr based on where the csum is.
-+		 * We need to do this because we will read in entire prealloc
-+		 * extents but we may have written to say the middle of the
-+		 * prealloc extent, so we need to make sure the csum goes with
-+		 * the right disk offset.
-+		 *
-+		 * We can do this because the data reloc inode refers strictly
-+		 * to the on disk bytes, so we don't have to worry about
-+		 * disk_len vs real len like with real inodes since it's all
-+		 * disk length.
-+		 */
-+		new_bytenr = ordered->start + (sums->bytenr - disk_bytenr);
-+		sums->bytenr = new_bytenr;
- 
- 		btrfs_add_ordered_sum(inode, ordered, sums);
- 	}
---
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