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Date: Thu, 24 Jul 2014 10:44:18 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Wang Shilong <wangsl.fnst@...fujitsu.com>, Chris Mason <clm@...com>, David Sterba <dsterba@...e.cz>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.11 009/128] Btrfs: set right total device count for seeding support 3.11.10.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Wang Shilong <wangsl.fnst@...fujitsu.com> 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@...fujitsu.com> Signed-off-by: Chris Mason <clm@...com> Cc: David Sterba <dsterba@...e.cz> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- fs/btrfs/volumes.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index f79b027fa0f1..ca9a51400035 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1844,7 +1844,6 @@ static int btrfs_prepare_sprout(struct btrfs_root *root) 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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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