System for creating mount command from verified programmable options compatible with file system types to attach media file system to an existing file system

• US 5,721,948 A
• Filed: 02/29/1996
• Issued: 02/24/1998
• Est. Priority Date: 02/29/1996
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Duncan, William L.
• Primary Examiner(s): Meky, Moustafa M.
• Application Number:
  US08/608,756
• Time in Patent Office: 726 Days
• Field of Search: 395/500, 395/616, 395/620, 395/621, 395/613, 395/615, 395/670, 395/672, 395/651, 395/652, 395/653, 395/825
• US Class Current: 710/5
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

Programmable options for a mount command are checked for compatibility with file system types when attaching a media file system to a existing file system in a computing system. The options are programmed into a mount entry in a configuration file. The configuration file is used to generate the mount command. The mount entry defines file system types for the media file system and programmable options to control operation of the computing system with the media file system. The file system types, the programmable options and the compatibility of the programmable options with the file system types are all verified.

Claims

1. A method for verifying programmable options compatibility with file system types in attaching a media file system to an existing file system in a computing system, said media file system on media being mounted on the computing system, said method comprising the steps of:

reading a mount entry from a configuration file, the mount entry defining file system types for the media file system and programmable options controlling operation of the computing system with the media file system;

verifying the file system types, the programmable options and the compatibility of the programmable options with the file system types;

creating a mount command to attach the media file system to the existing file system and an option string in the command from the programmable options verified by said verifying step; and

executing the command with option string to attach the media file system to the existing file system so that the computing system operates with the media file system in accordance with verified programmable options.

2. The method of claim 1 wherein said verifying step comprises the steps of:

first comparing the file system type from the mount entry to a list of valid file system types and indicating the file system type as a legal file system type if the file system type matches one of the valid file system types;

second comparing the programmable option from the mount entry to a list of valid programmable options and indicating the programmable option as a legal programmable option if the programmable option matches one of the valid programmable options;

third comparing the legal programmable option against the legal file system type to verify that the programmable option is compatible with the legal file system type.

3. The method of claim 1 wherein said verifying step comprises the steps of:

comparing the file system types and the programmable options to legal file system types and legal programmable options to produce verified file system types from the mount entry and verified programmable options from the mount entry;

checking each verified programmable option from the mount entry against all verified file system types from the mount entry to determine that each verified programmable option is compatible with at least one of the verified file system types.

4. The method of claim 3 wherein said comparing step comprises the steps of:

getting each file system type from the mount entry;

type comparing each file system type to a list of legal file system types and producing a verified file system type for each file system type that matches a legal file system type;

getting each programmable option from the mount entry;

option comparing each programmable option to a list of legal programmable options and producing a verified programmable option for each programmable option that matches a legal programmable option;

writing a pattern entry in a mount data structure for each mount entry, said pattern entry having a pattern identifier from the mount entry, verified file system types and verified programmable options produced from the mount entry by said type comparing step and said option comparing step.

5. The method of claim 4 wherein said checking step comprises the steps of:

reading the pattern entry from the mount data structure;

getting all of the verified file system types from the pattern entry;

getting each verified programmable option from the pattern entry;

testing the compatibility of each verified programmable option with all of the verified file system types and producing a compatible option for said creating step to convert to a option string in the command to attach the media file system to the existing file system.

6. Apparatus for compatibility checking programmable options with file system types when attaching a media file system to an existing file system in a computer, the computer having a processor, input/output devices, and a plurality of data storage devices, said processor having a central processing unit, memory and input/output control, said input/output control connected to the input/output devices and data storage devices, said apparatus comprising:

a parse module scanning a configuration file to read mount entries from the configuration file;

a configuration mount module building a mount data structure from the mount entries read by said parse module, said mount data structure having a pattern entry for each mount entry and each pattern entry having a pattern identifier, and at least one verified file system type and at least one verified programmable option;

a hard mount module setting a mount option indicator for each verified programmable option in a pattern entry if the verified programmable option is compatible with at least one of the verified file system types in the pattern entry whereby a mount command can be created to attach the media file system associated with the pattern entry in accordance with programmable options indicated by the mount option indicators.

7. The apparatus of claim 6 wherein said configuration mount module comprises:

type scan module scanning the file system types in a mount entry to detect if each file system type is a legal file system type;

option scan module scanning the programmable options in a mount entry to detect if each programmable option is a legal programmable option;

a write module writing into memory a pattern entry for each mount entry, said pattern entry comprising a pattern identifier from the mount entry, verified file system types detected as a legal file system type from the mount entry by said type scan module and verified programmable options detected as legal programmable options from the mount entry by said option scan module.

8. The apparatus of claim 7 wherein said hard mount module comprises:

a retrieve module retrieving all the verified file system types and each verified programmable option from the pattern entry;

a testing module checking the compatibility of each verified programmable option retrieved from the pattern entry with all the verified system types from the pattern entry; and

an option setting module for setting an option indicator for each programmable option compatible with at least one of the verified file system types.

9. A computer program storage medium readable by a computing system and encoding a computer program of instructions for executing a computer process for verifying programmable options compatibility with file system types in attaching a media file system to an existing file system in the computing system, said computer process comprising the steps of:

reading a mount entry from a configuration file, the mount entry defining file system types for the media file system and programmable options controlling operation of the computing system with the media file system;

verifying the validity of the file system types and the programmable options;

creating a mount command to attach the media file system to the existing file system in accordance with compatible programmable options; and

testing the compatibility of the programmable options from the mount entry with the file system types from the mount entry.

10. The computer program storage medium of claim 9 where in the computer program the computer process step of verifying comprises the steps of:

comparing the file system type from the mount entry to a list of valid file system types and indicating the file system type as a legal file system type if the file system type matches one of the valid file system types; and

comparing the programmable option from the mount entry to a list of valid programmable options and indicating the programmable option as a legal programmable option if the programmable option matches one of the valid programmable options.

11. The computer program storage medium of claim 10 where in the computer program the computer process step of testing comprises the steps of:

checking each legal programmable option from the mount entry against all legal file system types from the mount entry to determine that each legal programmable option is compatible with at least one of the legal file system types.

12. The computer program storage medium of claim 11 where in the computer program the computer process step of verifying further comprises the steps of:

writing a pattern entry in a mount data structure for each mount entry, said pattern entry having a pattern identifier from the mount entry, legal file system types and legal programmable options produced from the mount entry by said type comparing step.

13. The computer program storage medium of claim 12 where in the computer program the computer process step of checking comprises the steps of:

getting all of the legal file system types from the pattern entry;

getting each legal programmable option from the pattern entry;

detecting the compatibility of each verified programmable option with all of the verified file system types; and

setting a compatible option indicator for each verified programmable option compatible with at least on the verified file system types.

14. The computer program storage medium of claim 13 where said computer process in the computer program further comprises the step of:

executing the command with option string to attach the media file system to the existing file system so that the computing system operates with the media file system in accordance with programmable options.