Btrfs: set right total device count for seeding support
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@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -1934,7 +1934,6 @@ static int btrfs_prepare_sprout(struct btrfs_root *root)
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fs_devices->seeding = 0;
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fs_devices->num_devices = 0;
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fs_devices->open_devices = 0;
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fs_devices->total_devices = 0;
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fs_devices->seed = seed_devices;
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generate_random_uuid(fs_devices->fsid);
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