Non-bindable mount in a shared mount tree

• US 20070198540A1
• Filed: 02/01/2006
• Published: 08/23/2007
• Est. Priority Date: 02/01/2006
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Pai, Ramachandra N., Kohl, John T.
• Application Number:
  US11/344,652
• Publication Number:
  US 20070198540A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

A system and method are provided for mitigating propagation of select mounts in a shared mount tree. One or more mounts in the mount tree may be designated as non-bindable. Each non-bindable mount cannot be mirrored to a mount point through a mirror operation of a mount subtree in which the non-bindable mount resides. Similarly, each non-bindable mount prevents a submount residing on the non-bindable mount to be mirrored. However, the non-bindable mount and it'"'"'s submounts may be mirrored when the entire mount tree is mirrored and attached to a mount point that resides in a no mount tree that acts as a pivot for a new mount tree created through a mirror operation. A mirror of the non-bindable mount maintains the properties of the non-bindable mount.

Claims

1. A method for replicating a mount tree comprising:

creating a mount tree with at least one filesystem mounted in a root directory marked as shared; and

mounting at least one filesystem to a select directory in communication with said root directory and marking said mount as non-bindable, wherein said non-bindable mount includes semantics comprising;

disallowing said marked non-bindable mount to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides;

disallowing submounts residing on said marked non-bindable mount to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides; and

allowing said non-bindable mount and any submounts attached to said non-bindable mount to be mirrored when said mount tree is mirrored in its entirety and attached to a self contained mount point that functions as a pivot for a new mount tree, wherein said mirrored non-bindable mount creates a new non-bindable mount.

2. The method of claim 1, wherein said self contained mount point is a mount point that resides in a no mount tree.

3. The method of claim 1, further comprising creating an exact mirror of said mount tree under a specified location in said mount tree while preserving said semantic of said non-bindable mount in said tree.

4. The method of claim 3,wherein the step of creating an exact mirror of said mount tree includes creating said non-bindable mount at a specified location, and for each mirror of said mount tree creating:

a mount point within said non-bindable mount, creating a mirror of said mount tree, and mounting said mirror on said mount point within said non-bindable mount.

5. The method of claim 4, further comprising creating multiple views of a file system represented by said mount tree by mapping each mirrored mount tree to a view of said file system.

6. A mount tree comprising:

at least one filesystem mounted in a root directory and said mount being marked shared; and

at least one filesystem mounted to a select directory in communication with the root directory and marked as non-bindable, wherein said non-bindable mount having semantics comprising;

said marked non-bindable mount being disallowed to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides;

submounts residing on said marked mount being disallowed to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides; and

said non-bindable mount and any submounts attached to said non-bindable mount being allowed to be mirrored when said mount tree is mirrored in its entirety and attached to a self contained mount point that functions as a pivot for a new mount tree, wherein said mirrored non-bindable mount creates a new non-bindable mount.

7. The mount tree of claim 6, wherein said self contained mount point is a mount point that resides in a no mount tree.

8. The mount tree of claim 6, further comprising an exact mirror of said mount tree adapted to be created under a specified location in said mount tree while said property of said non-bindable mount in said tree are preserved.

9. The mount tree of claim 8, wherein creation of the exact mirror of said mount tree with said non-bindable mount created at a specified location, and for each mirror of said mount tree creates:

a mount point within said non-bindable mount, a mirror of said mount tree, and a mount of said mirror on said mount point within said non-bindable mount.

10. The mount tree of claim 9, further comprising a manager adapted to create multiple views of a filesystem represented by said mount tree by a map of each mirrored mount tree to a view of said filesystem.

11. An article comprising:

a computer readable medium;

means in the medium for creating a mount tree with at least one filesystem mounted in a root directory marked as shared; and

means in the medium for mounting at least one filesystem to a select directory in communication with the root directory and marking said mount as non-bindable, wherein said non-bindable mount includes semantics comprising;

disallowing said marked non-bindable mount to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides;

disallowing submounts residing on said marked non-bindable mount to be mirrored through a mirror operation of a mount subtree in which said non-bindable mount resides; and

allowing said non-bindable mount and any submounts attached to said non-bindable mount to be mirrored when said mount tree is mirrored in its entirety and attached to a self contained mount point that functions as a pivot for a new mount tree, wherein said mirrored non-bindable mount creates a new non-bindable mount.

12. The article of claim 11, wherein said self contained mount point is a mount point that resides in a no mount tree.

13. The article of claim 11, further comprising means in the medium for creating an exact mirror of said mount tree under a specified location in said mount tree while preserving said semantics of said non-bindable mount in said tree.

14. The article of claim 13,wherein the means for of creating an exact mirror of said mount tree includes creating said non-bindable mount at a specified location, and for each mirror of said mount tree creating:

a mount point within said non-bindable mount, creating a mirror of said mount tree, and mounting said mirror on said mount point within said non-bindable mount.

15. The article of claim 14, further comprising means in the medium for creating multiple views of a filesystem represented by said mount tree by mapping each mirrored mount tree to a view of said filesystem.