From: Omar Sandoval <osandov@xxxxxx> Hi, This series implements swap file support for Btrfs. Compared to v5 [1], this is pretty much feature-complete. It now supports: - Balance (skips block groups containing an active swap file) - Resize (error if trying to shrink past a block group containing an active swap file, allowed otherwise) - Device delete/replace (as long as the device in question does not contain an active swap file) This implementation Chris and I came up with is much cleaner than my earlier ideas: instead of adding any counters to struct btrfs_block_group_cache or struct btrfs_device, we just have a small red-black tree of block groups and devices which contain an active swapfile. I updated the xfstests for this series [2] to test this new functionality, and put it through the same tests as v5. Based on v4.19-rc2, please take a look. Thanks! 1: https://www.spinics.net/lists/linux-btrfs/msg81550.html 2: https://github.com/osandov/xfstests/tree/btrfs-swap 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 | 24 +++ fs/btrfs/dev-replace.c | 8 + fs/btrfs/disk-io.c | 4 + fs/btrfs/inode.c | 316 ++++++++++++++++++++++++++++++ fs/btrfs/ioctl.c | 31 ++- fs/btrfs/relocation.c | 18 +- fs/btrfs/volumes.c | 71 +++++-- fs/btrfs/volumes.h | 9 + include/linux/swap.h | 13 +- mm/page_io.c | 6 +- mm/swapfile.c | 14 +- 13 files changed, 492 insertions(+), 51 deletions(-) -- 2.18.0
