This is a note to let you know that I've just added the patch titled
Btrfs: set right total device count for seeding support
to the 3.15-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-set-right-total-device-count-for-seeding-support.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 298658414a2f0bea1f05a81876a45c1cd96aa2e0 Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
Date: Tue, 13 May 2014 17:05:06 +0800
Subject: Btrfs: set right total device count for seeding support
From: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
commit 298658414a2f0bea1f05a81876a45c1cd96aa2e0 upstream.
Seeding device support allows us to create a new filesystem
based on existed filesystem.
However newly created filesystem's @total_devices should include seed
devices. This patch fix the following problem:
# mkfs.btrfs -f /dev/sdb
# btrfstune -S 1 /dev/sdb
# mount /dev/sdb /mnt
# btrfs device add -f /dev/sdc /mnt --->fs_devices->total_devices = 1
# umount /mnt
# mount /dev/sdc /mnt --->fs_devices->total_devices = 2
This is because we record right @total_devices in superblock, but
@fs_devices->total_devices is reset to be 0 in btrfs_prepare_sprout().
Fix this problem by not resetting @fs_devices->total_devices.
Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/volumes.c | 1 -
1 file changed, 1 deletion(-)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1903,7 +1903,6 @@ static int btrfs_prepare_sprout(struct b
fs_devices->seeding = 0;
fs_devices->num_devices = 0;
fs_devices->open_devices = 0;
- fs_devices->total_devices = 0;
fs_devices->seed = seed_devices;
generate_random_uuid(fs_devices->fsid);
Patches currently in stable-queue which might be from wangsl.fnst@xxxxxxxxxxxxxx are
queue-3.15/btrfs-set-right-total-device-count-for-seeding-support.patch
queue-3.15/btrfs-make-sure-there-are-not-any-read-requests-before-stopping-workers.patch
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