lklfuse: add copy_file_range and lseek hooks #576
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The copy_file_range() syscall allows filesystems to optimize a copy workload by using reflinks or server-side offload. It can be triggered via e.g. xfs_io -f -c "copy_range copysrc" copydest Without this hook, (kernel) fuse currently falls back to manual read/write via splice_copy_file_range(). Signed-off-by: David Disseldorp <[email protected]>
This allows for SEEK_HOLE / SEEK_DATA, e.g. /run/lklfuse-sda# xfs_io -f ./seekme xfs_io> truncate 1M xfs_io> statx -m all fd.path = "./seekme" fd.flags = non-sync,non-direct,read-write stat.ino = 136 stat.type = regular file stat.size = 1048576 stat.blocks = 0 xfs_io> pwrite 100K 1k wrote 1024/1024 bytes at offset 102400 1 KiB, 1 ops; 0.0002 sec (3.439 MiB/sec and 3521.1268 ops/sec) xfs_io> pwrite 512K 1k wrote 1024/1024 bytes at offset 524288 1 KiB, 1 ops; 0.0002 sec (4.585 MiB/sec and 4694.8357 ops/sec) xfs_io> seek -d 0 Whence Result DATA 102400 xfs_io> seek -h 102400 Whence Result HOLE 106496 xfs_io> seek -d 106496 Whence Result DATA 524288 Signed-off-by: David Disseldorp <[email protected]>
tavip
approved these changes
Feb 28, 2025
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These hooks are helpful for copy optimization (reflinks) and sparse file navigation via
SEEK_DATA/SEEK_HOLE.