mkfs.btrfs cannot find rotational file for SSD detection for a pmem device

mkfs.btrfs does not detect pmem devices as being SSDs in kernel 4.2. Label: (null) UUID: 46603efe-728c-43fe-8241-ffc125e1a7ed Node size: 16384 Sector size:4096 Filesystem size:8.00GiB Block group profiles: Data: single8.00Mi

[PATCH] btrfs: memset cur_trans->delayed_refs to zero

Use memset() to null out the btrfs_delayed_ref_root of btrfs_transaction instead of setting all the members to 0 by hand. Signed-off-by: Alexandru Moise <00moses.alexande...@gmail.com> --- fs/btrfs/transaction.c | 10 +- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/fs/btrf