[Crash-utility] printing the linked structures

[Yogesh Blore]

Hi,

Here is a scenario in which three structures (of type 'struct
anon_vma_chain') are linked with the element 'struct list_head
same_anon_vma'. Please check the following structure.

crash> struct anon_vma_chain -o
struct anon_vma_chain {
   [0] struct vm_area_struct *vma;
   [4] struct anon_vma *anon_vma;
   [8] struct list_head same_vma;
  [16] struct list_head same_anon_vma;
}
SIZE: 24

The following are the three structures that are linked:

crash> anon_vma_chain -l anon_vma_chain.same_anon_vma 0xe4315510
struct anon_vma_chain {
  vma = 0xe43144f0,
  anon_vma = 0xe49e2d98,
  same_vma = {
    next = 0xe4314528,
    prev = 0xe43154f0
  },
  same_anon_vma = {
    next = 0xe4fe4f60,
    prev = 0xe4e833a8
  }
}

same_anon_vma.next=0xe4fe4f60 from the previous structure, is used to
extract the next structure.

crash> anon_vma_chain -l anon_vma_chain.same_anon_vma 0xe4fe4f60
struct anon_vma_chain {
  vma = 0xe4fe85f8,
  anon_vma = 0xe49e2d98,
  same_vma = {
    next = 0xe4fe8630,
    prev = 0xe4fe4f40
  },
  same_anon_vma = {
    next = 0xe45a1df8,
    prev = 0xe4315510
  }
}


same_anon_vma.next=0xe45a1df8 from the previous structure, is used to
extract the next structure.

crash> anon_vma_chain -l anon_vma_chain.same_anon_vma 0xe45a1df8
struct anon_vma_chain {
  vma = 0xe45a73e8,
  anon_vma = 0xe49e2d98,
  same_vma = {
    next = 0xe45a7420,
    prev = 0xe45a1dd8
  },
  same_anon_vma = {
    next = 0xe461fb40,
    prev = 0xe4fe4f60
  }
}

Is there something like "anon_vma_chain -l
anon_vma_chain.same_anon_vma 0xe4315510 -c 3" to get three structures
that are linked using anon_vma_chain.same_anon_vma. Actually
"anon_vma_chain -l anon_vma_chain.same_anon_vma 0xe4315510 -c 3"
doesn't work in this case. It seems like -c option works only in case
of array of structures. Could someone help me to print the above three
structures with a single command?

Thanks,
Yogesh