Efficient transparent rollback of file system consolidation migrations

A method, comprising:

• performing, by a system comprising a processor, a migration from a source file system on a first computer to a destination file system on a second computer, wherein performing the migration comprises re-assigning a network address from identifying the first computer to identifying the second computer;
• in response to receiving, by the system, a request, issued by a client computer, to perform a file system operation on the destination file system, wherein the request identifies a first source file handle:
• directing, by the second computer and to the first computer, to perform the file system operation on the source file system with the first source file handle, to produce a second source file handle,
• converting the first source file handle to corresponding first components of a destination file handle,
• converting the second source file handle to corresponding second components of the destination file handle,
• performing the file system operation on the destination file system with the first components of the destination file handle and the second components of the destination file handle, and
• responding to the client computer with the second source file handle;
• and
• in response to determining to roll back the migration, re-assigning, by the system, the network address from identifying the second computer to identifying the first computer, wherein the client computer is configured to use the second source file handle that was issued by the second computer in accessing resources of the source file system.

A non-transitory computer-readable medium comprising instructions that, in response to execution, cause a system comprising a processor to perform operations, comprising:

• performing a migration from a source file system on a first computer to a destination file system on a second computer, wherein performing the migration comprises re-assigning a network address from identifying the first computer to identifying the second computer;
• in response to receiving a request, issued by a client computer, to perform a file system operation on the destination file system, wherein the request identifies a first source file handle:
• directing, by the second computer and to the first computer, to perform the file system operation on the source file system with the first source file handle, to produce a second source file handle,
• converting the first source file handle to corresponding first components of a destination file handle,
• converting the second source file handle to corresponding second components of the destination file handle,
• performing the file system operation on the destination file system with the first components of the destination file handle and the second components of the destination file handle, and
• responding to the client computer with the second source file handle;
• and
• in response to determining to roll back the migration, re-assigning the network address from identifying the second computer to identifying the first computer, wherein the client computer is configured to use the second source file handle that was issued by the second computer in accessing resources of the source file system.