Hi all, This series improves the performance (and correctness for some filesystems) by adding the ability to cache iomap mappings in the kernel. For filesystems that can change mapping states during pagecache writeback (e.g. unwritten extent conversion) this is absolutely necessary to deal with races with writes to the pagecache because writeback does not take i_rwsem. For everyone else, it simply eliminates roundtrips to userspace. If you're going to start using this code, I strongly recommend pulling from my git trees, which are linked below. With a bit of luck, this should all go splendidly. Comments and questions are, as always, welcome. --D kernel git tree: https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=fuse-iomap-cache --- Commits in this patchset: * libfuse: enable iomap cache management for lowlevel fuse * libfuse: add upper-level iomap cache management --- include/fuse.h | 31 ++++++++++++++++++++ include/fuse_common.h | 12 ++++++++ include/fuse_kernel.h | 26 +++++++++++++++++ include/fuse_lowlevel.h | 41 ++++++++++++++++++++++++++ lib/fuse.c | 30 +++++++++++++++++++ lib/fuse_lowlevel.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++ lib/fuse_versionscript | 4 +++ 7 files changed, 217 insertions(+)
