CN109326307A - CD streaming carving method - Google Patents
CD streaming carving method Download PDFInfo
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- CN109326307A CN109326307A CN201811045454.5A CN201811045454A CN109326307A CN 109326307 A CN109326307 A CN 109326307A CN 201811045454 A CN201811045454 A CN 201811045454A CN 109326307 A CN109326307 A CN 109326307A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
- G11B27/026—Electronic editing of analogue information signals, e.g. audio or video signals on discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00451—Recording involving ablation of the recording layer
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Management Or Editing Of Information On Record Carriers (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The invention discloses a kind of CD streaming carving method, include the following steps: to include at least two CD mirrorings, CD mirroring is written to the continuous streaming of user application in the directory information where file data and file；CD mirroring includes the first CD mirroring and the second CD mirroring, after the memory space of the first CD mirroring in use has used, file data is split, the first CD mirroring is written in a part of data of file, the second CD mirroring is written in the follow-up data of file.The invention has the benefit that maximizing rom space efficiency, on the other hand it can identify that some file is likely distributed on one or multiple CDs at the time of reading.
Description
Technical field
The present invention relates to field of computer technology, and in particular to a kind of CD streaming carving method.
Background technique
Current general data filing storage medium has disk, tape and CD.Wherein more and more significant datas need
Long-term preservation.Wherein optical disc storage has the characteristics that long-term preservation maintenance cost is very low, and can reliably save CD is more than 30 years.
Although the write performance difference of CD and writing that number is few, this by chance meets cold data and reads the characteristic write less more.So being based on CD
It is highly-safe, highly reliable, the service life is long, characteristics, more and more enterprises such as at low cost have selected CD server as storage medium.
But the capacity of single compact disc or smaller at present.CD CD is approximately 700MB, DVD platter single side 4.7GB,
Most multipotency imprinting about 4.59G data (because DVD 1GB=1000MB, and 1GB=1024MB of hard disk) (two-sided 8.5GB, most
Mostly can about carve the data of 8.3GB), then bigger, BD single-surface single-layer 25GB, two-sided 50GB, the four layers of 100GB of blue light (BD), mesh
The CD of preceding 300GB has also emerged.Its capacity of the holographic optical disk of Tokyo Polytechnics reaches 2TB.But single-deck holds in this way
Amount still can not be compared with hard disk and tape.
The physical space that magnanimity CD separates can be merged into a big logical space using CD server, that is, adopted
With CD server virtualization mechanism, multiple CDs are externally invented a massive store pond.In order to improve CD server system
Overall performance, ease for use and availability, when user is when using this CD server, data are written in CD server hard disk cache first
A series of CD mirrorings in, once a certain mirror image is filled, then close the mirror image, it become read-only mirror image, finally the mirror
As the corresponding physical disc of complete imprinting, thus can a complete data set it is transparent be burnt to multiple physical discs it
On.In practical applications, user constantly writes the data to CD server.System needs the file or mesh that this streaming is written
Record, with sequence, reasonably write-in is sequentially written in a series of CD mirrorings, this requires system on the one hand enough can divide automatically mirror
Picture guarantees that each mirror image is no more than disc size, while guaranteeing the continuity of file directory itself as far as possible；On the other hand, it needs
The memory space for sufficiently using mirror image as far as possible, avoids the waste in optical disc storage space.
But it is directed to the mode of the CD burning of large volume data sets at present, it is main to use first total caching, rear static state point
The mode cut, that is, completely saved in a hard disk data set is burned to, data set static segmentation is then carried out again, is segmented
At later, the Sub Data Set after each segmentation is burnt in CD.But this static offline partitioning scheme is not suitable with online
Streaming recording modes.In streaming imprinting, that is, constantly there are new file or catalogue write-in, system that can not be determined in advance
The size of presently written catalogue and file and boundary also can not just carry out static data collection segmentation.
One feasible method is that a batch file is first stored in hard disk cache, the side then divided again using traditional static
Method.But this needs a large amount of hard drive spaces to carry out caching the data that this batch is burned to；It is also introduced into additional write-in data simultaneously
Disk data flow is flowed and divides, the two will do it I/O competition for hard disk, to reduce real data write performance；It is prior
It is that batch division is inherently highly difficult, in online situation, it cannot be guaranteed that file data is exactly CD capacity in a batch
Integral multiple, then the remaining space of last CD in this batch is also inconvenient to utilize in lower batch writing process.
Therefore it needs a kind of method to can be realized the stream data imprinting for CD, on the one hand guarantees the company of storing process
On the other hand continuous property also guarantees that the storage efficiency in optical disc storage space maximizes.
Summary of the invention
The purpose of the present invention is to provide a kind of CD streaming carving methods, on the one hand make rom space efficiency maximum
Change, on the other hand can identify that some file is likely distributed on one or multiple CDs at the time of reading.
To achieve the above object, the technical scheme is that
A kind of CD streaming carving method, which comprises the steps of:
Including at least two CD mirrorings, the continuous streaming of user application the catalogue where file data and file is believed
Breath write-in CD mirroring；
CD mirroring includes the first CD mirroring and the second CD mirroring, when the memory space of the first CD mirroring in use makes
After being finished, file data is split, the first CD mirroring is written in a part of data of file, the follow-up data of file is write
Enter the second CD mirroring.
Preferably,
Mark file, the first CD are had additional in the divided file stored in first CD mirroring and the second CD mirroring respectively
Mark file content in mirror image includes the ID of the second CD mirroring, and the content of the mark file in the second CD mirroring includes the
The ID of one CD mirroring.
Preferably, when createing directory, system is that the catalogue distributes CD cluster, and safeguards the catalogue data in memory
It updates, when the catalogue is closed, the first CD mirroring corresponding position is written in cluster involved in the catalogue；
If in writing process the first CD mirroring system report without free space exception when, the directory creating to second
CD mirroring；When the second CD mirroring creaties directory, in the first absolute path for creating the catalogue in second CD mirroring
All preamble catalogues, create oneself later, when finally the catalogue is closed, the second CD mirroring institute be written in the clusters of all updates
Corresponding position.
Preferably, when file is written in user, the preamble directory information in this document absolute path is created until root；
After having created preamble catalogue, file metadata is created, and starts that file data is written；During createing directory, light occurs
Disk file system report without free space exception when, then the directory creating to next Zhang Guangpan；
In file writing process, the first CD mirroring system report without free space exception when；The second CD mirroring is selected to make
For the carrier of follow-up data storage, the ID of the second CD mirroring is obtained；
Then the first CD mirroring residue number of clusters is detected, if real surplus free time number of clusters is greater than a threshold value；In the first light
First identifier file is created in disk mirroring, first identifier file name is made of original file name and numeral mark, first identifier
The content of file includes the ID for recording the second CD mirroring where this document follow-up data content；In the second CD mirroring,
The preposition catalogue in this document absolute path is re-created, then creates second identifier file, second identifier file name is by original
File name and numeral mark composition, the content of second identifier file include that the first CD mirroring where file data is divided in front
ID；Finally, follow-up data is written；
When detecting the first CD mirroring residue number of clusters, if real surplus number of clusters is less than a threshold value, file first is read
The content of cluster within the scope of the last threshold size of CD mirroring is stored in memory cache, and deletes this in the first CD mirroring
The content of a little clusters, records current file physical length in this document metadata；It creates third and identifies file, third identifies file
Title be made of old file name and numeral mark, third mark file content include record this document subsequent content the second light
The reel number of disk mirroring；In the second CD mirroring, the preposition catalogue in this document absolute path is re-created, then creates the 4th
File is identified, the title of the 4th mark file is made of original file name and numeral mark, and the content of the 4th mark file includes
The ID number of first CD mirroring；Finally, the data of the cluster within the scope of the threshold size saved in memory and later subsequent
Data are sequentially written in.
The operation principle of the present invention is that: 1, the present invention can not know current file directory actually required allocation space
In the case of, file is creatied directory to streaming and is written in CD mirroring, when " no idle sky occurs for data write-in CD mirroring
Between " (out-of-space) it is abnormal when, using the exception handling procedure, after catalogue or the remaining data write-in that can not be created
In continuous free time CD.This method can simplify system design, and the remaining space size of CD is opened without real-time tracking one.
2, when not closing, interior data cluster content can be modified CD mirroring.The present invention utilizes this point,
When a CD mirroring remaining space is not enough to rebuild tab file of the same name, then last several clusters of this document are read in
In depositing, the content of this cluster is then removed, creates corresponding mark file.Finally using several clusters in memory as subsequent file
Content.
3, using the practical principle at least occupying two clusters of a file, a cluster is the metadata of this document, another
Clustered file data content, by reservation or the artificial space generated for 2 clusters, so as to create mark file.
When reading some optical file, if catalogue where this document contains a same file name but tail portion is special
The file of label, first reads file data, and the length of file data is obtained from metadata, then after reading in special file
Disc ID where continuous file, later out of, data that read special file of the same name according to same file path in next CD
Hold and former document saves content and spliced, obtains complete file data.
Identifying file has file name identical with this document, but increases a special mark in mark tail of file
Note, the special marking can be "+" and sequence number, such as first segmentation file is "+1 ", if this document is in lower Zhang Guang
It still needs to divide in disk, add "+2 " labeled as filename, and according to the subsequent singulation file of the regular marks this document.
The invention has the benefit that can not know the final size of presently written file, or the reality that creaties directory
It in the case where allocation space, sequentially creaties directory, or CD mirroring is written in file data.Pass through the efficient of file destination
Splicing mechanism can make full use of the memory space of CD.By filename identifier mechanism, where determining a segmentation file
CD position, to go back original full content by merging.
Detailed description of the invention
Fig. 1 is the overall flow schematic diagram of streaming CD burning in the present invention；
Fig. 2 is the flow chart to create directory in the embodiment of the present invention；
Fig. 3 is the flow chart of the write-in file in the embodiment of the present invention；
Fig. 4 is the flow chart of the reading file in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, further description of the specific embodiments of the present invention.Following embodiment is only
For clearly illustrating technical solution of the present invention, and not intended to limit the protection scope of the present invention.
The technical solution that the present invention embodies is:
Embodiment: Fig. 1 is the overall flow schematic diagram of streaming CD burning, and Fig. 2 is the flow chart to create directory, and Fig. 3 is write-in
The flow chart of file, Fig. 4 are the flow chart for reading file.
One group of free time CD mirroring is written to the continuous streaming of user application in file, catalogue.CD mirroring and physics
CD has identical amount of physical memory, and each byte corresponds, and has globally unique image banner ID, has local text
Part system.When initial, mirror image can be written and change, and can create in the mirror image and more new directory and file, when data are write
It complete or mirrored storage space after use, can be with the active closure mirror image, so that it becomes read-only mirror image.Read-only mirror image can
One-time write one opens physical disc.
File and catalogue include an absolute directory, that is, the fullpath from this document to root.
Usage of CD -ROM cluster stores block unit as basic distribution, and each catalogue contains at least one cluster, and each file includes
At least two cluster, a cluster place file metadata information；Remaining cluster includes file data.
In the present embodiment, as shown in Figure 1, it is assumed that a certain moment user needs to Make Path for the catalogue of/A/B/C, and works as
Preceding CD mirroring (ID number 1) file system dish out " no free space " (out-of-space) exception when, which is created
It is built to next CD mirroring (ID number 2).
Assuming that a certain moment user need write paths be /(file content is for the file of A/B/C.txt
Aaabbbcccddef ...), after data aaabbb is written, current optical disc mirror image (ID number 3) file system is dished out " no free time
When the exception in space " (out-of-space), the creation mark file in current optical disc mirror image, then subsequent file data
(cccddef ...) automatically writes next CD mirroring (ID number 4), also carries out file identification.
Illustrate the specific course of work of the invention in embodiment below:
(1) create directory/A/B/C process is as follows:
(1-1) is firstly, execute the operation that creaties directory；
(1-2) current optical disc mirror image (ID number 1) file system whether there is or not dish out " no free space " (out-of-space) it is different
Often, if so, then going to step (1-3)；If nothing, (1-5) is gone to step；
(1-3) next CD mirroring (ID number 2) create in the catalogue absolute path all preamble catalogues (/ ,/A ,/A/
B)；
(1-4) creates the catalogue (/A/B/C)；
CD corresponding position where the catalogue is written in the cluster of update by (1-5)；
(1-6) completes the operation that creaties directory.
(2) write-in file/A/B/C.txt process is as follows:
(2-1) is firstly, execute write-in file operation；
Whether there is or not dish out " no free space " (out-of-space) for (2-2) current first CD mirroring (ID number 3) file system
It is abnormal, if so, then going to step (2-3)；If nothing, (2-15) is gone to step；
It is 4 that (2-3), which chooses new second CD mirroring of blank and obtain its No. ID(ID)；
(2-4) detects current first CD residue number of clusters, if real surplus space number of clusters is greater than some threshold value (being assumed to be 2),
Go to step (2-5)；If being less than, (2-9) is gone to step；
(2-5), which creates one in current first CD mirroring, has same file name but the special number label of tail portion increase by one
The new file (the entitled C+1 of file, file content include the CD mirroring ID number 4 of this document subsequent content) of (being assumed to be "+1 ")；
(2-6) re-creates the preposition catalogue (/ ,/A ,/A/B) of this document absolute path in the second CD mirroring；
(2-7) the second CD mirroring entitled meta file name of creation file but tail portion increase a special number mark (assuming that
For "+1 ") new file (the entitled C+1 of file), and in file metadata identify front single cent part where CD ID number 3；
New file is written in follow-up data by (2-8), goes to step (2-15)；
The data that (2-9) reads last 2 cluster save in memory, and these data are deleted in current optical disc mirror image；
(2-10) records the physical length of current file in the metadata of file C；
(2-11), which creates one in current first CD mirroring, has same file name but the special number mark of tail portion increase by one
(the entitled C+1 of file, new logo file content include the CD for recording this document subsequent content to the new file of note (being assumed to be "+1 ")
Mirror image ID number 4)；
(2-12) re-creates the preposition catalogue (/ ,/A ,/A/B) of this document absolute path in the second CD mirroring；
(2-13) the second CD mirroring entitled meta file name of creation file but tail portion increase a special number mark (assuming that
For "+1 ") new file (the entitled C+1 of file), and in file metadata identify front single cent part where CD ID number 3；
New file is written in the data of 2 clusters in memory and file follow-up data by (2-14)；(2-15) completes write-in file operation.
(3) it is as follows to read file/A/B/C.txt process:
(3-1) reads file operation firstly, executing；
Whether containing a same file name (C), still tail portion is special marking ("+1 ") under catalogue where (3-2) this document
File, if so, then going to step (3-3)；If nothing, (3-7) is gone to step；
(3-3) obtains the length of file data from this document metadata, reads corresponding file data；
(3-4) reads the ID number 4 of subsequent file place CD from special file；
(3-5) from ID number be 4 CD according to same file path (/A/B) read special file (C+1) data content；
(3-6) splices the content and former document content, obtains complete file content；
(3-7) completes to read file operation.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of CD streaming carving method, which comprises the steps of:
Including at least two CD mirrorings, the continuous streaming of user application the catalogue where file data and file is believed
Breath write-in CD mirroring；
CD mirroring includes the first CD mirroring and the second CD mirroring, when the memory space of the first CD mirroring in use makes
After being finished, file data is split, the first CD mirroring is written in a part of data of file, the follow-up data of file is write
Enter the second CD mirroring.
2. CD streaming carving method according to claim 1, which is characterized in that
Mark file, the first CD are had additional in the divided file stored in first CD mirroring and the second CD mirroring respectively
Mark file content in mirror image includes the ID of the second CD mirroring, and the content of the mark file in the second CD mirroring includes the
The ID of one CD mirroring.
3. CD streaming carving method according to claim 2, which is characterized in that
When createing directory, system is that the catalogue distributes CD cluster, and safeguards the update of the catalogue data in memory, when the mesh
When record is closed, the first CD mirroring corresponding position is written in cluster involved in the catalogue；
If in writing process the first CD mirroring system report without free space exception when, the directory creating to second
CD mirroring；When the second CD mirroring creaties directory, in the first absolute path for creating the catalogue in second CD mirroring
All preamble catalogues, create oneself later, when finally the catalogue is closed, the second CD mirroring institute be written in the clusters of all updates
Corresponding position.
4. CD streaming carving method according to claim 1, which is characterized in that
When file is written in user, the preamble directory information in this document absolute path is created until root；Before having created
After preface and table of contents record, file metadata is created, and starts that file data is written；During createing directory, compact disk file system occurs
When reporting the exception without free space, then the directory creating to next Zhang Guangpan；
In file writing process, the first CD mirroring system report without free space exception when；The second CD mirroring is selected to make
For the carrier of follow-up data storage, the ID of the second CD mirroring is obtained；
Then the first CD mirroring residue number of clusters is detected, if real surplus free time number of clusters is greater than a threshold value；In the first light
First identifier file is created in disk mirroring, first identifier file name is made of original file name and numeral mark, first identifier
The content of file includes the ID for recording the second CD mirroring where this document follow-up data content；In the second CD mirroring,
The preposition catalogue in this document absolute path is re-created, then creates second identifier file, second identifier file name is by original
File name and numeral mark composition, the content of second identifier file include that the first CD mirroring where file data is divided in front
ID；Finally, follow-up data is written；
When detecting the first CD mirroring residue number of clusters, if real surplus number of clusters is less than a threshold value, file first is read
The content of cluster within the scope of the last threshold size of CD mirroring is stored in memory cache, and deletes this in the first CD mirroring
The content of a little clusters, records current file physical length in this document metadata；It creates third and identifies file, third identifies file
Title be made of old file name and numeral mark, third mark file content include record this document subsequent content the second light
The reel number of disk mirroring；In the second CD mirroring, the preposition catalogue in this document absolute path is re-created, then creates the 4th
File is identified, the title of the 4th mark file is made of original file name and numeral mark, and the content of the 4th mark file includes
The ID number of first CD mirroring；Finally, the data of the cluster within the scope of the threshold size saved in memory and later subsequent
Data are sequentially written in.
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| CN103617250A (en) * | 2013-11-28 | 2014-03-05 | 中经云数据存储科技（北京）有限公司 | File management method based on optical storage array and file format system |
| CN104008066A (en) * | 2014-05-26 | 2014-08-27 | 武汉光忆科技有限公司 | File access method and device of optical disc storage system |
| CN104616680A (en) * | 2014-12-25 | 2015-05-13 | 武汉光忆科技有限公司 | Repeating data deleting system based on optical disc storage as well as data operating method and device |
| CN105989008A (en) * | 2015-01-27 | 2016-10-05 | 炬芯（珠海）科技有限公司 | Method and device for enabling data to write in mirror image documents |
| CN106155626A (en) * | 2016-07-04 | 2016-11-23 | 江苏大学 | One Android Sparse form image download method fast and effectively |
| CN107122133A (en) * | 2017-04-24 | 2017-09-01 | 珠海全志科技股份有限公司 | Date storage method and device |
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