This patch series removes the use of buffer_heads from btrfs' super block read and write paths. It also converts the integrity-checking code to only work with pages and BIOs. Compared to buffer heads, this gives us a leaner call path, as the buffer_head code wraps around getting pages from the page-cache and adding them to BIOs to submit. The first patch removes buffer_heads from superblock reading. The second removes it from super_block writing and the subsequent patches remove the buffer_heads from the integrity check code. It's based on misc-next from Wednesday February 5, and doesn't show any regressions in xfstests to the baseline. This is more or less a consolidation submission, as I lost track what changes have been requested. Changes to v3: - Incroporated feedback from Christoph Changes to v2: - Removed patch #1 again - Added Reviews from Josef - Re-visited page locking, but not changes, it retains the same locking scheme the buffer_heads had - Incroptorated comments from David regarding open-coding functions - For more details see the idividual patches. Changes to v1: - Added patch #1 - Converted sb reading and integrity checking to use the page cache - Added rationale behind the conversion to the commit messages. - For more details see the idividual patches. Johannes Thumshirn (5): btrfs: use the page-cache for super block reading btrfs: use BIOs instead of buffer_heads from superblock writeout btrfs: remove btrfsic_submit_bh() btrfs: remove buffer_heads from btrfsic_process_written_block() btrfs: remove buffer_heads form superblock mirror integrity checking fs/btrfs/check-integrity.c | 218 +++++++++++-------------------------- fs/btrfs/check-integrity.h | 2 - fs/btrfs/disk-io.c | 195 +++++++++++++++++++-------------- fs/btrfs/disk-io.h | 4 +- fs/btrfs/volumes.c | 57 +++++----- fs/btrfs/volumes.h | 2 - 6 files changed, 210 insertions(+), 268 deletions(-) -- 2.24.1
