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 patches are simple preps, patches 5-7 implement support for discards, write zeroes and secure erases correspondingly. While the two latter commands use the same code path, discards only reuses common callbacks and not bio allocation loop because of differences in how the range is sliced into bios, see granularity handling in bio_discard_limit(). Note that there are differences with ioctl() versions, these are asynchronous and looser on synchronisation with page cache allowing more races, see comments to patch 5. liburing tests: https://github.com/isilence/liburing.git discard-cmd-test Pavel Begunkov (7): 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_write() block: implement async discard as io_uring cmd block: implement async wire write zeroes block: implement async secure erase block/blk.h | 1 + block/fops.c | 2 + block/ioctl.c | 231 ++++++++++++++++++++++++++++++++--- include/linux/blkdev.h | 4 + include/linux/io_uring/cmd.h | 15 +++ include/linux/pagemap.h | 2 + include/uapi/linux/fs.h | 4 + io_uring/io_uring.c | 11 ++ io_uring/io_uring.h | 1 + io_uring/uring_cmd.c | 7 ++ mm/filemap.c | 18 ++- 11 files changed, 273 insertions(+), 23 deletions(-) base-commit: 15dadb5430367959a455818fef80350a68c010f4 -- 2.45.2
