From: Omar Sandoval <osan...@fb.com> Hi,
This series implements swap file support for Btrfs. Changes since v4 [1]: - Added a kernel doc for btrfs_get_chunk_map() - Got rid of "Btrfs: push EXCL_OP set into btrfs_rm_device()" - Made activate error messages more clear and consistent - Changed clear vs unlock order in activate error case - Added "mm: export add_swap_extent()" as a separate patch - Added a btrfs_wait_ordered_range() at the beginning of btrfs_swap_activate() to catch newly created files - Added some Reviewed-bys from Nikolay I took a stab at adding support for balance when a swap file is active, but it's a major pain: we need to mark block groups which contain swap file extents, check the block group counter in relocate/scrub, then unmark the block groups when the swap file is deactivated, which gets really messy because the file can grow while it is an active swap file. If this is a deal breaker, I can work something out, but I don't think it's worth the trouble. This was tested with the swap tests in xfstests plus my new tests here [2]. Additionally, I used my swapme test program [3] and ran a few memory-intensive workloads (e.g., a highly parallel kernel build), verifying that swap was being used. All of this was done with lockdep enabled. This series is based on v4.19-rc1. Please take a look. Thanks! 1: https://www.spinics.net/lists/linux-btrfs/msg78731.html 2: https://github.com/osandov/xfstests/tree/btrfs-swap 3: https://github.com/osandov/osandov-linux/blob/master/scripts/swapme.c Omar Sandoval (6): mm: split SWP_FILE into SWP_ACTIVATED and SWP_FS mm: export add_swap_extent() vfs: update swap_{,de}activate documentation Btrfs: prevent ioctls from interfering with a swap file Btrfs: rename get_chunk_map() and make it non-static Btrfs: support swap files Documentation/filesystems/Locking | 17 +-- Documentation/filesystems/vfs.txt | 12 +- fs/btrfs/ctree.h | 6 + fs/btrfs/disk-io.c | 3 + fs/btrfs/inode.c | 232 ++++++++++++++++++++++++++++++ fs/btrfs/ioctl.c | 51 ++++++- fs/btrfs/volumes.c | 28 ++-- fs/btrfs/volumes.h | 9 ++ include/linux/swap.h | 13 +- mm/page_io.c | 6 +- mm/swapfile.c | 14 +- 11 files changed, 348 insertions(+), 43 deletions(-) -- 2.18.0
