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Stat() calls are expensive on NFS as they need a full network
round-trip. We detect when a write immediately follows the
last one and skip the Stat in this case because the write
cannot create a file hole.
On my (slow) NAS, this takes the write speed from 24MB/s to
41MB/s.
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mapMutex can be anonymous and using an RWMutex is overkill
because the lock protects very short sections.
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"git status" for reference:
renamed: pathfs_frontend/args.go -> internal/fusefrontend/args.go
renamed: pathfs_frontend/compat_darwin.go -> internal/fusefrontend/compat_darwin.go
renamed: pathfs_frontend/compat_linux.go -> internal/fusefrontend/compat_linux.go
renamed: pathfs_frontend/file.go -> internal/fusefrontend/file.go
renamed: pathfs_frontend/file_holes.go -> internal/fusefrontend/file_holes.go
renamed: pathfs_frontend/fs.go -> internal/fusefrontend/fs.go
renamed: pathfs_frontend/fs_dir.go -> internal/fusefrontend/fs_dir.go
renamed: pathfs_frontend/names.go -> internal/fusefrontend/names.go
renamed: pathfs_frontend/write_lock.go -> internal/fusefrontend/write_lock.go
modified: main.go
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