This is a note to let you know that I've just added the patch titled
btrfs: allow balancing to dup with multi-device
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-allow-balancing-to-dup-with-multi-device.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 88be159c905a2b4f6d59afa352bef410afb6af02 Mon Sep 17 00:00:00 2001
From: "Austin S. Hemmelgarn" <ahferroin7@xxxxxxxxx>
Date: Wed, 23 Mar 2016 14:22:59 -0400
Subject: btrfs: allow balancing to dup with multi-device
From: Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx>
commit 88be159c905a2b4f6d59afa352bef410afb6af02 upstream.
Currently, we don't allow the user to try and rebalance to a dup profile
on a multi-device filesystem. In most cases, this is a perfectly sensible
restriction as raid1 uses the same amount of space and provides better
protection.
However, when reshaping a multi-device filesystem down to a single device
filesystem, this requires the user to convert metadata and system chunks
to single profile before deleting devices, and then convert again to dup,
which leaves a period of time where metadata integrity is reduced.
This patch removes the single-device-only restriction from converting to
dup profile to remove this potential data integrity reduction.
Signed-off-by: Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/volumes.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3699,10 +3699,8 @@ int btrfs_balance(struct btrfs_balance_c
num_devices--;
}
btrfs_dev_replace_unlock(&fs_info->dev_replace);
- allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
- if (num_devices == 1)
- allowed |= BTRFS_BLOCK_GROUP_DUP;
- else if (num_devices > 1)
+ allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE | BTRFS_BLOCK_GROUP_DUP;
+ if (num_devices > 1)
allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
if (num_devices > 2)
allowed |= BTRFS_BLOCK_GROUP_RAID5;
Patches currently in stable-queue which might be from ahferroin7@xxxxxxxxx are
queue-4.5/btrfs-allow-balancing-to-dup-with-multi-device.patch
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