On Tue, Jul 01, 2025 at 01:44:16PM +0200, Hanna Czenczek wrote:
> Hi,
>
> This series:
> - Fixes some bugs/minor inconveniences,
> - Removes libfuse from the request processing path,
> - Make the FUSE export use coroutines for request handling,
> - Introduces multi-threading into the FUSE export.
>
> More detail on the v1 cover letter:
> https://lists.nongnu.org/archive/html/qemu-block/2025-03/msg00359.html
>
> v2 cover letter:
> https://lists.nongnu.org/archive/html/qemu-block/2025-06/msg00040.html
>
>
> Changes from v2:
> - Patch 12: Moved qemu_fcntl_addfl() into the #ifndef _WIN32 section
> where other fcntl() wrappers reside
> - Patch 13: Fixed comment to say `export` instead of `exp`; kept
> Stefan’s R-b
> - Patch 15: Same as patch 13
> - Patch 18: In macro, use correct parameter `queue` instead of the
> non-existing `q`
>
>
> git-backport-diff from v2:
>
> Key:
> [----] : patches are identical
> [####] : number of functional differences between upstream/downstream patch
> [down] : patch is downstream-only
> The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively
>
> 001/21:[----] [--] 'fuse: Copy write buffer content before polling'
> 002/21:[----] [--] 'fuse: Ensure init clean-up even with error_fatal'
> 003/21:[----] [--] 'fuse: Remove superfluous empty line'
> 004/21:[----] [--] 'fuse: Explicitly set inode ID to 1'
> 005/21:[----] [--] 'fuse: Change setup_... to mount_fuse_export()'
> 006/21:[----] [--] 'fuse: Fix mount options'
> 007/21:[----] [--] 'fuse: Set direct_io and parallel_direct_writes'
> 008/21:[----] [--] 'fuse: Introduce fuse_{at,de}tach_handlers()'
> 009/21:[----] [--] 'fuse: Introduce fuse_{inc,dec}_in_flight()'
> 010/21:[----] [--] 'fuse: Add halted flag'
> 011/21:[----] [--] 'fuse: Rename length to blk_len in fuse_write()'
> 012/21:[----] [-C] 'block: Move qemu_fcntl_addfl() into osdep.c'
> 013/21:[0008] [FC] 'fuse: Manually process requests (without libfuse)'
> 014/21:[----] [--] 'fuse: Reduce max read size'
> 015/21:[0008] [FC] 'fuse: Process requests in coroutines'
> 016/21:[----] [--] 'block/export: Add multi-threading interface'
> 017/21:[----] [--] 'iotests/307: Test multi-thread export interface'
> 018/21:[0016] [FC] 'fuse: Implement multi-threading'
> 019/21:[----] [--] 'qapi/block-export: Document FUSE's multi-threading'
> 020/21:[----] [--] 'iotests/308: Add multi-threading sanity test'
> 021/21:[----] [--] 'fuse: Increase MAX_WRITE_SIZE with a second buffer'
>
>
> Hanna Czenczek (21):
> 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: Rename length to blk_len in fuse_write()
> block: Move qemu_fcntl_addfl() into osdep.c
> fuse: Manually process requests (without libfuse)
> fuse: Reduce max read size
> fuse: Process requests in coroutines
> block/export: Add multi-threading interface
> iotests/307: Test multi-thread export interface
> fuse: Implement multi-threading
> qapi/block-export: Document FUSE's multi-threading
> iotests/308: Add multi-threading sanity test
> fuse: Increase MAX_WRITE_SIZE with a second buffer
>
> qapi/block-export.json | 39 +-
> include/block/export.h | 12 +-
> include/qemu/osdep.h | 1 +
> block/export/export.c | 48 +-
> block/export/fuse.c | 1181 ++++++++++++++++++++------
> block/export/vduse-blk.c | 7 +
> block/export/vhost-user-blk-server.c | 8 +
> block/file-posix.c | 17 +-
> nbd/server.c | 6 +
> util/osdep.c | 18 +
> tests/qemu-iotests/307 | 47 +
> tests/qemu-iotests/307.out | 18 +
> tests/qemu-iotests/308 | 55 +-
> tests/qemu-iotests/308.out | 61 +-
> 14 files changed, 1213 insertions(+), 305 deletions(-)
>
> --
> 2.49.0
>
Nice!
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>