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https://bugzilla.redhat.com/show_bug.cgi?id=907554 In particular comments 2 & 3. We could change libguestfs's guestfs_mkfs (internally) so it always does an implicit wipefs on the filesystem. wipefs is not too onerous -- in particular I believe it only writes to a few chosen areas of the disk. Especially considering that we're about to run mkfs anyway which for some filesystems

Hi, I have a box with / and /home being subvolumes from the same btrfs filesystem. /etc/fstab: UUID=c0686... / btrfs subvol=root,x-systemd.device-timeout=0 1 1 UUID=c0686... /home btrfs subvol=home,x-systemd.device-timeout=0 1 1 ... / is initially mounted readonly by the initramfs, and then after switching to the real system, /home is attempted to be mounted in parallel with /

Our code is not ready to cope with a sectorsize that''s not equal to PAGE_SIZE. It will lead to hanging-on while writing something. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> --- fs/btrfs/disk-io.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 20196f4..b9866f2 100644 --- a/fs/btrfs/disk-io.c +++

root at five-72 ~ # dd if=/dev/zero of=/dev/sdb bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 8.67101 s, 121 MB/s root at five-72 ~ # parted /dev/sdb GNU Parted 2.1 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) mklabel gpt (parted) print Model: ATA ST3000DM001-1CH1 (scsi) -->