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Generic operations handled by VFS
VFS code handles:
- sys_open() and related functions - path lookup, crossing mounts, etc.
- sys_read(), sys_write(), sys_mmap(), aio, and all other system-call interface functions
- file descriptor operations (closing, duplicating, etc.)
- mounting filesystems
Most operations are done by doing generic work while delegating filesystem-specific functions to filesystem defined hooks (file/inode/super_block/dentry/... )