commit 58a4915ad2f8a87f4456aac260396df7e300e6f2
author Jens Axboe <axboe@fb.com> Tue Jun 10 12:53:56 2014 -0600
committer Jens Axboe <axboe@fb.com> Tue Jun 10 12:53:56 2014 -0600
tree 6481a87de33d3caa7b647c3347324eea1c474216
parent 2b8393b43ec672bb263009cd74c056ab01d6ac17

block: ensure that bio_add_page() always accepts a page for an empty bio

With commit 762380ad9322 added support for chunk sizes and no merging
across them, it broke the rule of always allowing adding of a single
page to an empty bio. So relax the restriction a bit to allow for that,
similarly to what we have always done.

This fixes a crash with mkfs.xfs and 512b sector sizes on NVMe.

Reported-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>