On Thu, Feb 04, 2021 at 07:21:39PM +0900, Naohiro Aota wrote: > This series adds zoned block device support to btrfs. Some of the patches > in the previous series are already merged as preparation patches. Moved from for-next to misc-next. > * Log-structured superblock > > Superblock (and its copies) is the only data structure in btrfs which > has a fixed location on a device. Since we cannot overwrite in a > sequential write required zone, we cannot place superblock in the > zone. > > This series implements superblock log writing. It uses two zones as a > circular buffer to write updated superblocks. Once the first zone is filled > up, start writing into the second zone. The first zone will be reset once > both zones are filled. We can determine the postion of the latest > superblock by reading the write pointer information from a device. About that, in this patchset it's still leaving superblock at the fixed zone number while we want it at a fixed location, spanning 2 zones regardless of their size.
