FROMLIST: fuse: Introduce passthrough for mmap
Enabling FUSE passthrough for mmap-ed operations not only affects performance, but has also been shown as mandatory for the correct functioning of FUSE passthrough. yanwu noticed [1] that a FUSE file with passthrough enabled may suffer data inconsistencies if the same file is also accessed with mmap. What happens is that read/write operations are directly applied to the lower file system (and its cache), while mmap-ed operations are affecting the FUSE cache. Extend the FUSE passthrough implementation to also handle memory-mapped FUSE file, to both fix the cache inconsistencies and extend the passthrough performance benefits to mmap-ed operations. [1] https://lore.kernel.org/lkml/20210119110654.11817-1-wu-yan@tcl.com/ Bug: 179164095 Link: https://lore.kernel.org/lkml/20210125153057.3623715-9-balsini@android.com/ Signed-off-by:Alessio Balsini <balsini@android.com> Change-Id: Ifad4698b0380f6e004c487940ac6907b9a9f2964 Signed-off-by:
Alessio Balsini <balsini@google.com>
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