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mydf
2007 Sep 13
0
question about modification of dd_parent_obj during COW
>From the online document of ZFS On-Disk Specification, I found there is a field named "dd_parent_obj" in dsl_dir_phys_t. will this field be modified or kept unchanged during snapshot COW?
For example, consider a ZFS filesytem mounted on /myzfs, which contains 2 subdirs(A and B). If we do the following steps:
1) create a snapshot named /myzfs at now.
2) rename /myzfs/A to /myzfs/A1.
I think the directory objects of /myzfs/A and /myzfs will be COW''d during the rename operation.
Now we can access dirctory B by specifing...