Checked write operation dispersed storage network frame

1. A method for a processing module of a computing device to execute a checked write request operation, the method comprises:

generating a payload of a dispersed storage network (DSN) frame regarding the checked write request operation by:

generating a transaction number field of the payload to include a transaction number corresponding to the checked write request operation; and

generating one or more slice payload sections, wherein a slice payload section of the one or more slice payload sections includes:

generating a slice name field to include a slice name of one or more slice names corresponding to an encoded data slice of one or more encoded data slices;

generating a last known slice revision numbering field to include a last known revision number of the slice name;

generating a new slice revision numbering field to include a new revision number of the slice name corresponding to the checked write request operation;

generating a slice length field to include a length of the encoded data slice; and

generating a slice payload field to include the encoded data slice; and

generating a protocol header of the DSN frame by:

generating a payload length field of the protocol header to include a payload length that represents length of the transaction number field and length of the one or more slice payload sections; and

generating remaining fields of the protocol header.

2. The method of claim 1 further comprises:

outputting the DSN frame in order of the protocol header, the transaction number field, and the one or more slice payload sections.

3. The method of claim 1 further comprises:

generating the last known revision number by at least one of:

selecting the last known revision number from a revision number list;

extracting the last known slice revision number from a check response message; and

extracting the last known slice revision number from a read response message.

4. The method of claim 1 , wherein generating remaining fields of the protocol header comprises at least one of:

generating an operation code field to indicate the checked write request operation;

generating a protocol class field to indicate a protocol class for the checked write request operation; and

generating a protocol class version field for the checked write request operation.

5. The method of claim 1 further comprises:

generating the transaction number by:

obtaining a clock value;

multiplying the clock value by a predetermined multiplier to produce an expanded clock value; and

summing the expanded clock value and a random number to produce the value, wherein a number of digits of the random number is substantially the same as a number of digits of the predetermined multiplier.

6. The method of claim 1 further comprises:

generating a plurality of DSN frames regarding the checked write request operation, wherein the plurality of DSN frames includes the DSN frame.

7. A method for a processing module of a computing device to execute a checked write response operation, the method comprises:

generating a payload of a dispersed storage network (DSN) frame regarding one or more slice names of the checked write response operation to include one or more status fields, wherein generating a status field of the one or more status fields to indicate a status code regarding storing of an encoded data slice associated with a slice name of the one or more slice names; and

generating a protocol header of the DSN frame by:

generating a payload length field of the protocol header to include a payload length that represents a length of the one or more status fields; and

generating remaining fields of the protocol header.

8. The method of claim 7 further comprises:

outputting the DSN frame in order of the protocol header and the one or more status fields.

9. The method of claim 7 , wherein generating remaining fields of the protocol header comprises at least one of:

generating an operation code field to indicate the checked write response operation;

generating a protocol class field to indicate a protocol class for the checked write response operation; and

generating a protocol class version field for the checked write response operation.

10. The method of claim 7 , wherein the status code comprises one of:

an indication that the encoded data slice was successful stored;

an indication of a transaction conflict;

an indication of an addressing error;

an indication of a revision check error;

an indication that a corresponding write request is unauthorized; and

an indication that the encoded data slice was not stored.

11. A computer comprises:

an interface;

a memory; and

a processor operably coupled to the interface and to the memory, where the processor is operable to:

generate a payload of a dispersed storage network (DSN) frame regarding a checked write request operation by:

generating a transaction number field of the payload to include a transaction number corresponding to the checked write request operation; and

generating one or more slice payload sections, wherein a slice payload section of the one or more slice payload sections includes:

generating a slice name field to include a slice name of one or more slice names corresponding to an encoded data slice of one or more encoded data slices;

generating a last known slice revision numbering field to include a last known revision number of the slice name;

generating a new slice revision numbering field to include a new revision number of the slice name corresponding to the checked write request operation;

generating a slice length field to include a length of the encoded data slice; and

generating a slice payload field to include the encoded data slice; and

generate a protocol header of the DSN frame by:

generating a payload length field of the protocol header to include a payload length that represents length of the transaction number field and length of the one or more slice payload sections; and

generating remaining fields of the protocol header.

12. The computer of claim 11 , wherein the processor further functions to:

output, via the interface, the DSN frame in order of the protocol header, the transaction number field, and the one or more slice payload sections.

13. The computer of claim 11 , wherein the processor further functions to:

generate the last known revision number by at least one of:

selecting the last known revision number from a revision number list;

extracting the last known slice revision number from a check response message; and

extracting the last known slice revision number from a read response message.

14. The computer of claim 11 , wherein the processor functions to generate the remaining fields of the protocol header by at least one of:

generating an operation code field to indicate the checked write request operation;

generating a protocol class field to indicate a protocol class for the checked write request operation; and

generating a protocol class version field for the checked write request operation.

15. The computer of claim 11 , wherein the processor further functions to:

generate the transaction number by:

obtaining a clock value;

multiplying the clock value by a predetermined multiplier to produce an expanded clock value; and

summing the expanded clock value and a random number to produce the value, wherein a number of digits of the random number is substantially the same as a number of digits of the predetermined multiplier.

16. The computer of claim 11 , wherein the processor further functions to:

generate a plurality of DSN frames regarding the checked write request operation, wherein the plurality of DSN frames includes the DSN frame.

17. A computer comprises:

an interface;

a memory; and

a processor operably coupled to the interface and to the memory, where the processor is operable to:

generate a payload of a dispersed storage network (DSN) frame regarding one or more slice names of a checked write response operation to include one or more status fields, wherein generating a status field of the one or more status fields to indicate a status code regarding storing of an encoded data slice associated with a slice name of the one or more slice names; and

generate a protocol header of the DSN frame by:

generating a payload length field of the protocol header to include a payload length that represents a length of the one or more status fields; and

generating remaining fields of the protocol header.

18. The computer of claim 17 , wherein the processor further functions to:

output, via the interface, the DSN frame in order of the protocol header and the one or more status fields.

19. The computer of claim 17 , wherein the processor functions to generate the remaining fields of the protocol header by at least one of:

generating an operation code field to indicate the checked write response operation;

generating a protocol class field to indicate a protocol class for the checked write response operation; and

generating a protocol class version field for the checked write response operation.

20. The computer of claim 17 , wherein the status code comprises one of:

an indication that the encoded data slice was successful stored;

an indication of a transaction conflict;

an indication of an addressing error;

an indication of a revision check error;

an indication that a corresponding write request is unauthorized; and

an indication that the encoded data slice was not stored.