CN100395695C - Small size computer system interface command processing method and equipment - Google Patents
Small size computer system interface command processing method and equipment Download PDFInfo
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- CN100395695C CN100395695C CNB200610103917XA CN200610103917A CN100395695C CN 100395695 C CN100395695 C CN 100395695C CN B200610103917X A CNB200610103917X A CN B200610103917XA CN 200610103917 A CN200610103917 A CN 200610103917A CN 100395695 C CN100395695 C CN 100395695C
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Abstract
The invention discloses a treatment method to order of the small computer system interface. The storage device will search the according address of the processing function in the SCSI order group when it receives the SCSI order, then it will treat the SCSI order using the corresponding function based on the address. It constructs the mapping relation between the SCSI order and the corresponding processing function, so it can avoid the complex contrasting process to make the storage device proper to any operating system. The invention also discloses a treating device for the SCSI order.
Description
Technical field
The present invention relates to the field of storage administrative skill, particularly a kind of disposal route of small size computer system interface command and equipment.
Background technology
Small computer system interface (Small Computer Systems Interface, SCSI) agreement is the basis of field of storage, how better (StorageArea Network, SAN) memory device is compatible most important to storage area network for parsing and treatment S CSI agreement.For various reasons, when different operating system and software were realized said function, its scsi command was not quite similar, even difference is very big.
Consult shown in Figure 1ly, such as multipath Failover, the Veritas software of the last operation of Windows and the realization principle of IBM are just fully different.Again such as the Windows of Microsoft and the AIX of IBM, these two kinds of operating systems also are not quite similar to the scsi command of realizing basic read-write, and the AIX of IBM is just many greatly than the minimum scsi command of the Windows requirement of Microsoft.The main cause that causes this species diversity is that a lot of softwares and operating system have adopted manufacturer's custom field in the SCSI agreement or custom command to realize separately function.The Veritas that goes up operation such as Windows mainly realizes the multipath function by the self-defined page or leaf among the scsi command Inquiry, and IBM then mainly adopts among the scsi command Mode Sense self-defined page or leaf to realize.In addition, even if the software of same producer, such as the Windows NT and the Windows 2003 of Microsoft, because software upgrading, technical progress and SCSI standard revise, scsi command is also different.This species diversity has brought very big inconvenience for the SAN memory device that is in SCSI protocol target device side.
If memory device can not compatible operating system as much as possible or application software, will greatly limit the usable range of memory device so.But because the diversity of operating system and application software, scsi command is numerous and diverse in addition, if the neither one realization flow of SCSI agreement preferably will be difficult to support the needs of this compatibility, also has been difficult to extendability preferably simultaneously.
Under the prior art in the scsi command treatment scheme, some SCSI that increases income handles code, all adopt the mode of " judging+enumerate ", that is to say, in the scsi command that judgement is received, if support this scsi command, then to call corresponding processing function and handle this scsi command, the false code of its base conditioning flow process is as follows:
Switch scsi command word
{
Case scsi command 1:
Call the processing function treatment S CSI order 1 of scsi command 1
break
Case scsi command 2:
Call the processing function treatment S CSI order 2 of scsi command 2
break
…
Case scsi command n:
Call the processing function treatment S CSI order n of scsi command n
break
default：
Scsi command is not supported, carries out fault processing
break
}
And the false code of the processing function flow process of scsi command m is:
Order page PageCode among the switch scsi command m
{
case?PageCode?0：
Switch operating system or application software
{
Case operating system 0
The function of the PageCode0 of 0 couple of scsi command m of call operation system is handled
break
…
Case operating system n
The n of call operation system handles the function of the PageCode0 of scsi command m
break
default
The unsupported operating system of PageCode0 is carried out fault processing
break
}
case?PageCode?m：
Switch operating system or application software
{
Case operating system 0
The function of the PageCode m of 0 couple of scsi command m of call operation system is handled
break
…
Case operating system n
The n of call operation system handles the function of the PageCode m of scsi command m
break
default
The unsupported operating system of PageCode m is carried out fault processing
break
}
default
Unsupported PageCode
break
}
Though the treatment scheme of above-mentioned scsi command is simple relatively, but processing procedure is numerous and diverse relatively, increase along with the scsi command of supporting, and the operating system of supporting or the increase of application software kind, the workload of safeguarding this switch-case or if-else if-else code will be very big, and very difficult.
Summary of the invention
The invention provides a kind of small computer system interface (SCSI) process of commands method and apparatus.The scsi command treatment scheme that exists in the prior art is numerous and diverse in order to solve, the big problem of processing function maintenance workload of scsi command.Make it better to adapt to various operating systems, use needs the SCSI compatibility.
Technical solution of the present invention is as follows:
A kind of disposal route of small size computer system interface command comprises step:
Receive the small computer system interface scsi command;
The inquiry scsi command concentrates whether to include described scsi command, and wherein said scsi command comprises the scsi command handled and the address of corresponding processing function thereof;
Determine that described scsi command concentrates when comprising described scsi command the address that obtains corresponding processing function according to described scsi command; Perhaps, determine that described scsi command concentrates when not comprising described scsi command, according to described scsi command inquiry system symbol table, the address that obtains corresponding processing function, and the address of described scsi command and the processing function that inquires is added described scsi command concentrate;
This processing function of call by location according to the processing function that obtains is handled described scsi command.
According to said method:
When the inquiry system symbol table, comprise step:
Naming rule according to the processing function of scsi command generates the title that the described scsi command that receives is handled function accordingly;
Inquire about corresponding address of handling function according to the title of the processing function of described generation in the system symbol table, described system symbol table comprises the title of processing function of whole scsi commands that system can realize and the address of corresponding processing function.
If do not comprise the address of the processing function of described scsi command in the system symbol table, then return corresponding error information.
Concentrate at described scsi command, set up the mapping relations between the address of scsi command and corresponding processing function by scsi command.
Concentrate at described scsi command, set up the mapping relations between the address of scsi command and corresponding processing function by the key word of scsi command; And before the inquiry scsi command, obtain the key word in the scsi command earlier.
Comprise the command description piece of this scsi command, the operating system of scsi command starter side operation and the relevant information of application program in the described scsi command.
Comprise the command description piece of described scsi command, the operating system of scsi command starter side operation and the relevant information of application program in the title of the processing function of the scsi command of described generation.
A kind of treatment facility of small size computer system interface command comprises:
Storage unit: be used to deposit scsi command and system symbol table, wherein said scsi command comprises the scsi command handled and the address of corresponding processing function, and described system symbol table comprises the title of processing function of whole scsi commands that system can realize and the address of corresponding processing function;
Receiving element: be used to receive scsi command;
First query unit: the address that is used for concentrating at scsi command the processing function of this scsi command of query processing according to the key word of the scsi command of described reception;
Second query unit: be used for when concentrating at described scsi command when can't obtain the address of corresponding processing function, according to the scsi command inquiry system symbol table of described reception, the address that obtains corresponding processing function;
Processing unit: the scsi command that is used for the address of the processing function that will obtain at the system symbol table and described reception joins described scsi command and concentrates;
Performance element: be used for the scsi command of described reception being handled according to this processing function of call by location of the processing function that is obtained.
Described equipment also comprises:
Converting unit: the key word that is used for before the inquiry scsi command, obtaining the scsi command of described reception;
The described scsi command of storing in the described storage unit is concentrated, and sets up the mapping relations between the address of scsi command and corresponding processing function by the key word of scsi command;
Described first query unit is further used for concentrating at scsi command according to the key word of the scsi command of described reception the address of the processing function of this scsi command of query processing.
Described equipment further comprises:
The function name generation unit: be used for when concentrating at described scsi command when can't obtain the address of corresponding processing function, the naming rule according to the processing function of the scsi command of described reception generates the corresponding title of handling function;
Second query unit is further used for the address according to title processing function of this scsi command of query processing in the system symbol table of the processing function of described generation;
Processing unit is further used for returning corresponding error information when the address of the processing function of the scsi command that can't obtain described reception in the system symbol table.
Beneficial effect of the present invention is as follows:
The present invention searches corresponding processing function successively according to the sign of reception scsi command in scsi command and system symbol table address, unify and simplified the treatment scheme of scsi command, numerous and diverse comparison process when having avoided using under the prior art address of mode query processing function of " judging+enumerate " has improved the work efficiency of memory device.And when the kind of scsi command, operating system or the application software supported when memory device increases, the address of the processing function that the present invention only need increase joins scsi command and concentrates, compare with the mode of " judging+enumerate ", significantly reduced scsi command and handled the workload that function is safeguarded, made it better to adapt to various operating system, use needs the SCSI compatibility.
Description of drawings
Fig. 1 is a storage area network networking structure synoptic diagram;
Fig. 2 is a scsi command treatment facility structural drawing in the embodiment of the invention;
Fig. 3 A is the building-block of logic of scsi command in the embodiment of the invention;
Fig. 3 B is the building-block of logic of system symbol table in the embodiment of the invention;
Fig. 4 is the processing flow chart of scsi command in the embodiment of the invention.
Embodiment
In storage area network, for treatment scheme, the work efficiency that improves memory device of simplifying scsi command, the maintenance difficulties that reduces the processing function, the present invention has adopted the method for setting up mapping relations between the concentrated address that is identified at scsi command and corresponding processing function according to scsi command of scsi command to obtain the address of the processing function of scsi command, and then calls this processing function the scsi command that is received is handled.
In the present embodiment, concentrate the mapping relations between the address can directly set up scsi command and corresponding processing function by scsi command at described scsi command, during inquiry directly the concentrated designator of the scsi command that receives of utilization and scsi command compare.
In order to improve inquiry velocity, a kind of preferable mode is to concentrate mapping relations between the address of setting up scsi command and corresponding processing function by the key word in the scsi command at described scsi command, obtains key word from received scsi command earlier during inquiry.As shown in Figure 3A, with the Hash table is example, concentrate at scsi command, at the command id S of scsi command with handle accordingly between the address A of function and set up a corresponding relation F who determines according to the key word k in the scsi command, be hash function, make the key word in each scsi command corresponding with a unique address of handling function.For example when key word was K, the address of handling function accordingly must not need to compare just and can directly obtain the record of looking on the memory location of F (K) thus, has simplified the treatment scheme of scsi command greatly.In addition, can also adopt other similar methods, as long as its efficiency of algorithm is higher, algorithm complex is moderate all can.
Generally speaking, scsi command is initialized as sky, therefore for first scsi command under certain operating system, need to generate the corresponding title of handling function according to this scsi command earlier, in the system symbol table, inquire about corresponding address of handling function according to the processing function name that generates then.
Should follow the naming rule of handling function in the system symbol table when generating the title of handling function, such as its primitive rule is " scsi_ orders running environment _ scsi command word _ scsi command word page or leaf parameter _ exec ", its implication by: handle the command description piece that must comprise institute's reception scsi command in the title of function, operating system that scsi command starter side is moved and the relevant information of application software.Like this, as long as follow the naming rule of handling function, just can generate qualified processing function name and in the system symbol table, obtain the address of handling function accordingly according to this function name.
Consult shown in Figure 2ly, the scsi command treatment facility in the present embodiment comprises storage unit 20, receiving element 21, converting unit 22, first query unit 23, function name generation unit 24, second query unit 25, processing unit 26 and performance element 27.First query unit 23, second query unit 25 and processing unit 26 respectively and 20 existence of storage unit communicate to connect, first query unit 23 and second query unit 25 respectively and 27 existence of performance element communicate to connect.
Described storage unit 20 is used for SCSI storage command set and system symbol table; Described receiving element 21 is used to receive scsi command, and this scsi command can be the order that the user imports, and also can be the order in the embedding program; Described converting unit 22 is used for obtaining the key word of the scsi command that is received; In order can to reduce occupation space and to improve inquiry velocity as far as possible, present embodiment is concentrated the mapping relations between the address of setting up scsi command and corresponding processing function by the key word of scsi command at the scsi command of system, therefore want elder generation obtain key word from the scsi command that is received before the inquiry scsi command.Described first query unit 23 is used for concentrating the corresponding address of handling function of inquiry according to the scsi command that is received at scsi command; Described function name generation unit 24 is used for generating the corresponding title of handling function when concentrating at scsi command when can't obtain the address of corresponding processing function according to the naming rule of handling function; Described second query unit 25 is used for handling accordingly in the inquiry of system symbol table according to the title of the processing function of described generation the address of function; Described processing unit 26 is used for the address of the processing function that will obtain at the system symbol table and the sign of the scsi command that received joins scsi command and concentrates, or returns corresponding error information when can't obtain the address of corresponding processing function in the system symbol table time; Described performance element 27 is used for according to this processing function of call by location of the processing function that obtains described scsi command being handled.The address of the processing function that first query unit 23 and second query unit 25 will be obtained in storage unit 20 is sent to performance element 27.
The scsi command of operation on the storage unit 20, the address that comprises the sign and the corresponding processing function thereof of the scsi command of having handled has comprised the command description piece of the scsi command that receives, the operating system of scsi command starter side operation and the relevant information of application program in the described sign.
The system symbol table of operation is a tabulation of all symbols and corresponding address thereof on the storage unit 20, and a symbol (symbol) is the establishment piece of a program, and it can be a variable name or a function name.In the present invention, the title of the processing function that symbol is a scsi command is shown in Fig. 3 B, among the present invention, there are corresponding mapping relations between the two in the title T of the processing function of whole scsi commands that the system that comprised the system symbol table can realize and handle the address A of function.
Because the inquiry of system symbol table is finished according to character string, so its inquiry velocity is lower, so after obtaining to handle the address of function, join scsi command to the sign of the scsi command of address that obtains and described reception concentrates, be the address that directly to concentrate the processing function that obtains this scsi command when receiving identical scsi command again, to improve the work efficiency of memory device from scsi command.
Consult shown in Figure 4ly, the concrete treatment scheme of scsi command is as follows:
Step 400: receive scsi command.
Step 401: the scsi command that is received is converted into corresponding key word.
Step 402:, concentrate the corresponding address of handling function of inquiry at the scsi command of system according to described key word.
Step 403: can't obtain the address of corresponding processing function then enter step 404 if concentrate, obtain this address else if, then enter step 408 at the scsi command of system.
Step 404:, generate the title of the processing function of the described scsi command that receives according to the naming rule of the processing function of scsi command.
Step 405: according to the processing function name that generates, inquiry system symbol table.
Step 406:, then carry out step 407, otherwise carry out step 409 if in the system symbol table, obtain the address of the processing function of described scsi command.
Step 407: the sign of the address of the processing function that will obtain in the system symbol table and the scsi command of described reception joins scsi command and concentrates.
Step 408:, call corresponding processing function the scsi command that is received is handled according to the address of the processing function that obtains.
Step 409: can't obtain the address of corresponding processing function in the system symbol table, illustrative system does not support that the scsi command or this scsi command that are received are wrong, returns corresponding error information.
For example, when memory device receives the order of first SCSI Inquiry0x80 page or leaf that server Windows 2003 issues, at first obtain the key word K1 in the order.Because to first scsi command under certain operating system, scsi command is initialized as sky,, do not concentrate K1 so not being present in described scsi command.Then system generates the processing function name " scsi_windows2003_inquiry_0x80_exec " of this scsi command according to the naming rule of the processing function of scsi command, and according to the name lookup system symbol table of the processing function that generates.
If in the system symbol table, obtain the address A1 of the processing function of this scsi command, then K1 and A1 are joined described scsi command and concentrate, again according to A1 call corresponding processing function to SCSI Inquiry0x80 order handle.
If corresponding error information is returned in the address that can't obtain the processing function of this scsi command in the system symbol table.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the disposal route of a small size computer system interface command is characterized in that, comprises step:
Receive the small computer system interface scsi command;
The inquiry scsi command concentrates whether to include described scsi command, and wherein said scsi command comprises the scsi command handled and the address of corresponding processing function;
Determine that described scsi command concentrates when comprising described scsi command the address that obtains corresponding processing function according to described scsi command; Perhaps, determine that described scsi command concentrates when not comprising described scsi command, according to described scsi command inquiry system symbol table, the address that obtains corresponding processing function, and the address of described scsi command and the processing function that inquires is added described scsi command concentrate;
Calling this processing function according to the processing function address that obtains handles described scsi command.
2. the method for claim 1 is characterized in that, when the inquiry system symbol table, comprises step:
Naming rule according to the processing function of scsi command generates the title that the described scsi command that receives is handled function accordingly;
Inquire about corresponding address of handling function according to the title of the processing function of described generation in the system symbol table, described system symbol table comprises the title of processing function of whole scsi commands that system can realize and the address of corresponding processing function.
3. method as claimed in claim 2 is characterized in that, if do not comprise the address of the processing function of described scsi command in the system symbol table, then returns corresponding error information.
4. the method for claim 1 is characterized in that, concentrates at described scsi command, sets up the mapping relations between the address of scsi command and corresponding processing function by scsi command.
5. the method for claim 1, it is characterized in that, concentrate at described scsi command, set up the mapping relations between the address of scsi command and corresponding processing function by the key word of scsi command, and before inquiring about scsi command, obtain the key word in the scsi command earlier.
6. as claim 4 or 5 described methods, it is characterized in that, comprise the command description piece of this scsi command, the operating system of scsi command starter side operation and the relevant information of application program in the described scsi command.
7. method as claimed in claim 2 is characterized in that, comprises the command description piece of described scsi command, the operating system of scsi command starter side operation and the relevant information of application program in the title of the processing function of the scsi command of described generation.
8. the treatment facility of a small size computer system interface command comprises:
Storage unit: be used to deposit scsi command and system symbol table, wherein said scsi command comprises the scsi command handled and the address of corresponding processing function, and described system symbol table comprises the title of processing function of whole scsi commands that system can realize and the address of corresponding processing function;
Receiving element: be used to receive scsi command;
First query unit: the address that is used for concentrating at scsi command the processing function of this scsi command of query processing according to the scsi command of described reception;
Second query unit: be used for when concentrating at described scsi command when can't obtain the address of corresponding processing function, according to the scsi command inquiry system symbol table of described reception, the address that obtains corresponding processing function;
Processing unit: the scsi command that is used for the address of the processing function that will obtain at the system symbol table and described reception joins described scsi command and concentrates;
Performance element: be used for the scsi command of described reception being handled according to this processing function of call by location of the processing function that is obtained.
9. equipment as claimed in claim 8 is characterized in that, also comprises:
Converting unit: the key word that is used for before the inquiry scsi command, obtaining the scsi command of described reception;
The described scsi command of storing in the described storage unit is concentrated, and sets up the mapping relations between the address of scsi command and corresponding processing function by the key word of scsi command;
Described first query unit is further used for concentrating at scsi command according to the key word of the scsi command of described reception the address of the processing function of this scsi command of query processing.
10. equipment as claimed in claim 8 or 9 is characterized in that, also comprises:
The function name generation unit: be used for when concentrating at described scsi command when can't obtain the address of corresponding processing function, the naming rule according to the processing function of the scsi command of described reception generates the corresponding title of handling function;
Second query unit is further used for the address according to title processing function of this scsi command of query processing in the system symbol table of the processing function of described generation;
Processing unit is further used for returning corresponding error information when the address of the processing function of the scsi command that can't obtain described reception in the system symbol table.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610103917XA CN100395695C (en) | 2006-07-26 | 2006-07-26 | Small size computer system interface command processing method and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610103917XA CN100395695C (en) | 2006-07-26 | 2006-07-26 | Small size computer system interface command processing method and equipment |
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| CN1889034A CN1889034A (en) | 2007-01-03 |
| CN100395695C true CN100395695C (en) | 2008-06-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289372A (en) * | 2011-07-21 | 2011-12-21 | 京信通信系统（中国）有限公司 | Character string protocol resolution method and device based on launcher umbilical tower (LUT) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132507A (en) * | 1998-10-27 | 2000-05-12 | Internatl Business Mach Corp <Ibm> | Command processing method for scsi protocol and device used for the processing method |
| CN1455334A (en) * | 2003-05-19 | 2003-11-12 | 清华大学 | Method of substituting conventional SCSI disk for optical fiber disk in storage optical-fiber network |
| CN1539100A (en) * | 2001-08-08 | 2004-10-20 | �Ҵ���˾ | Method and system for accessing tape devices in computer system |
-
2006
- 2006-07-26 CN CNB200610103917XA patent/CN100395695C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132507A (en) * | 1998-10-27 | 2000-05-12 | Internatl Business Mach Corp <Ibm> | Command processing method for scsi protocol and device used for the processing method |
| CN1539100A (en) * | 2001-08-08 | 2004-10-20 | �Ҵ���˾ | Method and system for accessing tape devices in computer system |
| CN1455334A (en) * | 2003-05-19 | 2003-11-12 | 清华大学 | Method of substituting conventional SCSI disk for optical fiber disk in storage optical-fiber network |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289372A (en) * | 2011-07-21 | 2011-12-21 | 京信通信系统（中国）有限公司 | Character string protocol resolution method and device based on launcher umbilical tower (LUT) |
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