There is an interest in having asynchronous block operations like discard and write zeroes. The series implements that as io_uring commands, which is an io_uring request type allowing to implement custom file specific operations. First 4 are preparation patches. Patch 5 introduces the main chunk of cmd infrastructure and discard commands. Patches 6-8 implement write zeroes variants. Branch with tests and docs: https://github.com/isilence/liburing.git discard-cmd The man page specifically (need to shuffle it to some cmd section): https://github.com/isilence/liburing/commit/a6fa2bc2400bf7fcb80496e322b5db4c8b3191f0 v5: add uapi/linux/blkdev.h number block cmd opcodes starting from IOC seq 0 don't export bio_discard_limit(), return to v2 and put bio if nowait can't proceed minor comment and stylistics changes v4: fix failing to pass nowait (unused opf) in patch 7 v3: use GFP_NOWAIT for non-blocking allocation fail oversized nowait discards in advance drop secure erase and add zero page writes renamed function name + other cosmetic changes use IOC / ioctl encoding for cmd opcodes v2: move out of CONFIG_COMPAT add write zeroes & secure erase drop a note about interaction with page cache Pavel Begunkov (8): io_uring/cmd: expose iowq to cmds io_uring/cmd: give inline space in request to cmds filemap: introduce filemap_invalidate_pages block: introduce blk_validate_byte_range() block: implement async io_uring discard cmd block: implement write zeroes io_uring cmd block: add nowait flag for __blkdev_issue_zero_pages block: implement write zero pages cmd block/blk-lib.c | 22 +++- block/blk.h | 1 + block/fops.c | 2 + block/ioctl.c | 242 ++++++++++++++++++++++++++++++++--- include/linux/bio.h | 4 + include/linux/blkdev.h | 1 + include/linux/io_uring/cmd.h | 15 +++ include/linux/pagemap.h | 2 + include/uapi/linux/blkdev.h | 16 +++ io_uring/io_uring.c | 11 ++ io_uring/io_uring.h | 1 + io_uring/uring_cmd.c | 7 + mm/filemap.c | 17 ++- 13 files changed, 314 insertions(+), 27 deletions(-) create mode 100644 include/uapi/linux/blkdev.h -- 2.45.2
