The last time this was addressed was at LFSMM this year in May [0] and before LBS was on its way upstream. LBS is now on v6.12 and so the delta required is much smaller now. Before the turkey massacre slows part of the world down, here's a refresh. Although Hannes' patches were in PATCH form, testing showed quickly that it wasn't quite ready yet. I've only done cursory testing so far but have also incorporated all of the fixes and feedback we could accumulate over time. And so I'm sticking to RFC to reflect that this still needs thorough testing. It at least does not crash for me yet and its a major rebase onto v6.12-rc7. The biggest changes now are these last patches: - block/bdev: lift block size restrictions and use common definition - nvme: remove superfluous block size check - bdev: use bdev_io_min() for statx block size The buffer-head pathces I think should be ready. If the consolidation of the max block size is good, perhaps we just also use it for the iomap max zero page too. Note that in theory we should be able to get up to a block size of 1 << (PAGE_SHIFT + MAX_PAGECACHE_ORDER), in practice testing that shows we need much more love [1] although prospects indeed show we should be able to get up to 2 MiB on x86_64. And so I think we should first reduce scope up to 64k for now, test all this, and then embark on the next 64k --> 2 MiB journey next. Thoughts? If you want this in a tree you can get this from the kdevops branch large-block-buffer-heads-for-next [2] [0] https://lore.kernel.org/all/20240514173900.62207-1-hare@xxxxxxxxxx/ [1] https://github.com/linux-kdevops/linux/commit/266f2c700be55bdb5626d521230597673c83c91d#diff-79b436371fdb3ddf0e7ad9bd4c9afe05160f7953438e650a77519b882904c56bL272 [2] https://github.com/linux-kdevops/linux/tree/large-block-buffer-heads-for-next Hannes Reinecke (4): fs/mpage: use blocks_per_folio instead of blocks_per_page fs/mpage: avoid negative shift for large blocksize fs/buffer: restart block_read_full_folio() to avoid array overflow block/bdev: enable large folio support for large logical block sizes Luis Chamberlain (4): fs/buffer fs/mpage: remove large folio restriction block/bdev: lift block size restrictions and use common definition nvme: remove superfluous block size check bdev: use bdev_io_min() for statx block size block/bdev.c | 9 +++++--- drivers/nvme/host/core.c | 10 --------- fs/buffer.c | 21 ++++++++++++++---- fs/mpage.c | 47 +++++++++++++++++++--------------------- fs/stat.c | 2 +- include/linux/blkdev.h | 6 ++++- 6 files changed, 51 insertions(+), 44 deletions(-) -- 2.43.0
