Hi,
This series first contains some two bug fix patches (one more than the
other), then a couple of small modifications to prepare for the big
ones:
We remove libfuse from the request processing path, only using it for
mounting. This does not really have a performance impact (but see the
benchmark results on that patch’s commit message), but it allows me to
sleep easier when it comes to concurrency, because I don’t know what
guarantees libfuse makes for coroutine concurrency.
In general, I just don’t feel that libfuse is really the best choice for
us: It seems primarily designed for projects that only provide a
filesystem, and nothing else, i.e. it provides a variety of main loops
and you’re supposed to use them. QEMU however has its own main loop and
event processing, so the opacity of libfuse’s request processing makes
me uneasy. Also, FUSE request parsing is not that hard.
Then, this series makes request processing run in coroutines.
Finally, it adds FUSE multi-threading (i.e. one FUSE FD per I/O thread).
Hanna Czenczek (15):
fuse: Copy write buffer content before polling
fuse: Ensure init clean-up even with error_fatal
fuse: Remove superfluous empty line
fuse: Explicitly set inode ID to 1
fuse: Change setup_... to mount_fuse_export()
fuse: Fix mount options
fuse: Set direct_io and parallel_direct_writes
fuse: Introduce fuse_{at,de}tach_handlers()
fuse: Introduce fuse_{inc,dec}_in_flight()
fuse: Add halted flag
fuse: Manually process requests (without libfuse)
fuse: Reduce max read size
fuse: Process requests in coroutines
fuse: Implement multi-threading
fuse: Increase MAX_WRITE_SIZE with a second buffer
qapi/block-export.json | 8 +-
block/export/fuse.c | 1227 ++++++++++++++++++++++++++++--------
tests/qemu-iotests/308 | 4 +-
tests/qemu-iotests/308.out | 5 +-
4 files changed, 965 insertions(+), 279 deletions(-)
--
2.48.1
