Add notify_inval_inode and extend get_rootfs to return fs_idx for umount#211
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…ount - Add notify_inval_inode method to fusedev to explicitly invalidate inode caches in the kernel, ensuring cache coherence when backend files change outside guest VFS. - Extend get_rootfs to return both Arc<BackFileSystem> and u8 fs_idx. This is necessary for correct unmount handling and cache invalidation. The implementation follows fuse kernel and libfuse protocols and maintains compatibility with existing patterns like notify_inval_entry. Signed-off-by: sidneychang <2190206983@qq.com>
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This PR includes two related improvements to better support multi-filesystem
mounting scenarios on fuse, especially during unmount operations:
Add
notify_inval_inodesupport in fusedev, enabling user space toexplicitly notify the kernel to invalidate inode page caches. This helps
clear caches properly after unmounting.
Extend the VFS method
get_rootfsto return both the mounted backendfilesystem (Arc) and its associated filesystem index
(fs_idx). Although multi-filesystem mounting is already supported,
returning fs_idx is necessary for proper unmount handling and cache
invalidation.
The implementation follows fuse kernel and libfuse protocols and maintains
compatibility with existing patterns like notify_inval_entry.