This patchset introduces 2 new feature flags, BLK_FEAT_READ_SYNCHRONOUS and SWP_READ_SYNCHRONOUS_IO. These changes are motivated by the need to better accommodate certain swap devices that support synchronous read operations but asynchronous write operations. The existing BLK_FEAT_SYNCHRONOUS and SWP_SYNCHRONOUS_IO flags are not sufficient for these devices, as they enforce synchronous behavior for both read and write operations. Patch 1: - introduce BLK_FEAT_READ_SYNCHRONOUS Patch 2: - introduce SWP_READ_SYNCHRONOUS_IO Qun-Wei Lin (2): block: add BLK_FEAT_READ_SYNCHRONOUS feature for synchronous read mm, swap: introduce SWP_READ_SYNCHRONOUS_IO include/linux/blkdev.h | 8 ++++++++ include/linux/swap.h | 31 ++++++++++++++++--------------- mm/memory.c | 3 ++- mm/page_io.c | 2 +- mm/swapfile.c | 3 +++ 5 files changed, 30 insertions(+), 17 deletions(-) -- 2.45.2
