One Filesystem vnode operations declare problem.

[kai ouyang]

Hi, everybody,
I have some questions about FS vnode operations. I found the filesystems always declare vnode operations by "VNODEOP_SET" more than once.
For example:
In DEVFS:
VNODEOP_SET(devfs_vnodeop_opv_desc);
VNODEOP_SET(devfs_specop_opv_desc);
In FFS:
VNODEOP_SET(ffs_vnodeop_opv_desc);
VNODEOP_SET(ffs_specop_opv_desc);
VNODEOP_SET(ffs_fifoop_opv_desc);
Why? Why can not the kerenel use only "devfs_vnodeop_opv_desc" or "ffs_vnodeop_opv_desc"?
Another words, I want to know the difference among those "VNODEOP_SET" in one filesystem.

Thank you!
Best Regards
Ouyang Kai




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