CN107480242A - A kind of method and system of establishment file system snapshot tree - Google Patents
A kind of method and system of establishment file system snapshot tree Download PDFInfo
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- CN107480242A CN107480242A CN201710680264.XA CN201710680264A CN107480242A CN 107480242 A CN107480242 A CN 107480242A CN 201710680264 A CN201710680264 A CN 201710680264A CN 107480242 A CN107480242 A CN 107480242A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/11—File system administration, e.g. details of archiving or snapshots
- G06F16/128—Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion
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Abstract
The invention discloses a kind of method and system of establishment file system snapshot tree, this method includes：Judge to whether there is SnapRealm structures in the inode metadata of current directory；If it is not, SnapRealm structures are created according to the inode metadata of current directory；Traversed up from current directory and search the parent directory containing SnapRealm structures, the SnapRealm structures of current directory inserted in the open_children containers of parent directory SnapRealm structures；Pass through such parent and open_children parent-child structure relation, when the snapshot in file system to be inquired about, need not all catalogue of one-level one-level inquiry file system, solve when the catalogue quantity in file system is excessive, all snapshots in inquiry file system just take the problem of serious, improve the efficiency of inquiry snapshot.
Description
Technical field
The present invention relates to file system snapshot technical field, more particularly to a kind of side of establishment file system snapshot tree
Method and system.
Background technology
With the development of information technology, electronic data is increasingly becoming the main matchmaker that people carry out information interchange and information transmission
It is situated between, just needs to be preserved for some electronic data, prevent loss of data from causing damage.
Snapping technique is a kind of e-file camera work, and with the raising of storage application demand, user needs online side
Formula carries out data protection, and snapshot is exactly one of effective ways that Online storage device takes precautions against loss of data, in ten years in past
In, snapshot has become disk array, volume manager, file system even PCI RAID (RAID) controller
Standard configuration function.Increasing equipment all starts to support this functionality.Increasing storage device supports snapshot work(
Can, the advantage of respective snapping technique is publicized in the data of these products, it is more to have plenty of snapshot quantity, has plenty of space-consuming
It is small.
File Snapshot function is mainly applied in file system, the snapshot operation to catalogue, so as to fast according to having generated
Shine into row rollback (recovery) data.File Snapshot supports snapshot, checks, deletes and rolling back action.Being provided with snapshot can be to one
Individual catalogue sets multiple snapshot, and data recovery is carried out according to Snapshot time point.
In the prior art, the snapshot inquired about in file system, all catalogues of one-level one-level inquiry file system are needed, so
If the catalogue quantity in file system is excessive, all snapshots in inquiry file system just take very much (need to travel through all mesh
Record).And when carrying out snapshot setting, it can not judge whether there is snapshot in its higher level's catalogue and subprime directory.
Therefore, a kind of scheme of establishment file system snapshot tree how is provided, it is possible to increase in file system is inquired about
Snapshot when efficiency and can interpolate that in higher level's catalogue and subprime directory whether there is snapshot, be that those skilled in the art need at present
Technical problems to be solved.
The content of the invention
It is an object of the invention to provide a kind of scheme of establishment file system snapshot tree, it is possible to increase in inquiry file system
In snapshot when efficiency and can interpolate that in higher level's catalogue and subprime directory whether there is snapshot.
In order to solve the above technical problems, the invention provides following technical scheme：
A kind of method of establishment file system snapshot tree, including：
Judge to whether there is SnapRealm structures in the inode metadata of current directory；
If it is not, SnapRealm structures are created according to the inode metadata of current directory；
Traversed up from current directory and search the parent directory containing SnapRealm structures, by current directory
In the open_children containers of SnapRealm structures insertion parent directory SnapRealm structures；
Parent directory SnapRealm structures are arranged to the parent structures of the SnapRealm structures of current directory.
Preferably, the SnapRealm structures of current directory are being inserted to the open_ of parent directory SnapRealm structures
After in children containers, in addition to：
Judge to whether there is SnapRealm structures in the subprime directory of current directory；
If so, the SnapRealm structures in subprime directory are inserted to the SnapRealm structures of current directory
In open_children containers.
Preferably, the SnapRealm structures in subprime directory are being inserted to the SnapRealm structures of current directory
Also include before in open_children containers：
The parent structures of subprime directory SnapRealm structures are in parent directory, then by subprime directory SnapRealm
The parent structures of structure are changed to the SnapRealm structures of current directory.
Preferably, in addition to：When carrying out snapshot operation to catalogue, the SNAPSHOT INFO of catalogue is stored in SnapRealm
In snaps in the srnode fields of structure.
A kind of system of establishment file system snapshot tree, including：
Judge module, it whether there is SnapRealm structures in the inode metadata for judging current directory；
Creation module, during in the inode metadata of current directory without SnapRealm structures, according to current mesh
The inode metadata of record creates SnapRealm structures；
Operation module, the parent directory containing SnapRealm structures is searched for being traversed up from current directory, will be current
In the open_children containers of the SnapRealm structures insertion parent directory SnapRealm structures of catalogue；
Definition module, for parent directory SnapRealm structures to be arranged to the SnapRealm structures of current directory
Parent structures.
Preferably, including：Judge module is additionally operable to：Judge to whether there is SnapRealm in the subprime directory of current directory
Structure；
Operation module is additionally operable to：The SnapRealm of SnapRealm structures insertion current directory in subprime directory is tied
In the open_children containers of structure body.
Preferably, operation module is additionally operable to：If the parent structures of subprime directory SnapRealm structures are in parent directory
In, then the parent structures of subprime directory SnapRealm structures are changed to the SnapRealm structures of current directory.
Preferably, in addition to：Memory module, for when carrying out snapshot operation to catalogue, the SNAPSHOT INFO of catalogue to be protected
Exist in the snaps in the srnode fields of SnapRealm structures.
Compared with prior art, above-mentioned technical proposal has advantages below：
The method and system of a kind of establishment file system snapshot tree provided by the present invention, by current directory
SnapRealm structures, insert to traverse up from current directory and search the parent directory containing SnapRealm structures
In the open_children containers of SnapRealm structures, parent directory SnapRealm structures are arranged to current directory
The parent structures of SnapRealm structures.By such parent and open_children parent-child structure relation,
When the snapshot in file system to be inquired about, as long as the snapshot metadata stored in the SnapRealm structures of inquiry parent directory
Information, it is not necessary to all catalogues of one-level one-level inquiry file system, if the catalogue quantity solved in file system is excessive
When, inquire about file system in all snapshots just take the problem of, improve inquiry snapshot efficiency；Meanwhile when inquiring about snapshot,
It can determine whether there is snapshot in catalogue by whether there is SnapRealm structures in the inode metadata of query directory, and
Because open_children containers contain the SnapRealm structures of subprime directory in the SnapRealm structures of parent directory,
So scheme provided by the present invention can also be simple and quick judge whether there is snapshot in higher level's catalogue and subprime directory.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
A kind of method flow for establishment file system snapshot tree that Fig. 1 is provided for a kind of embodiment of the present invention
Figure；
A kind of system architecture for establishment file system snapshot tree that Fig. 2 is provided for a kind of embodiment of the present invention is shown
It is intended to.
Embodiment
The core of the present invention is to provide a kind of scheme of establishment file system snapshot tree, it is possible to increase in inquiry file system
In snapshot when efficiency and can interpolate that in higher level's catalogue and subprime directory whether there is snapshot.
In order that the above objects, features and advantages of the present invention can become apparent it is understandable, below in conjunction with the accompanying drawings to this hair
Bright embodiment is described in detail.
Detail is elaborated in the following description in order to fully understand the present invention.But the present invention can with it is a variety of not
Other manner described here is same as to implement, those skilled in the art can do class in the case of without prejudice to intension of the present invention
Like popularization.Therefore the present invention is not limited to the specific embodiments disclosed below.
Fig. 1 is refer to, a kind of establishment file system snapshot tree that Fig. 1 is provided for a kind of embodiment of the present invention
Method flow diagram.
A kind of embodiment of the present invention provides a kind of method of establishment file system snapshot tree, this method bag
Include：
S11：Judge to whether there is SnapRealm structures in the inode metadata informations of current directory.
SnapRealm structures in file system directories inode metadata informations can carry out snapshot first in catalogue
When operation creates, the inode metadata informations according to catalogue are created, and SnapRealm structures are corresponding document catalogue member
Snapshot structure in data message, for storing snapshot metadata all under the catalogue, and the snapshot structure in snapshot
Relationship between superior and subordinate in tree.
There is no SnapRealm structures in some catalogues, represent that the catalogue did not created snapshot also, so the catalogue does not exist
, it is necessary to carry out creating the operation such as SnapRealm structures in snapshot tree construction.
So firstly the need of to whether judging in the catalogue containing SnapRealm structures, subsequently to be grasped
Make.
S12：If it is not, SnapRealm structures are created according to the inode metadata of current directory.
If not containing SnapRealm structures in current directory, need what is preserved according to the inode metadata of catalogue
The date created of file, create size etc. information creating SnapRealm structures.
After SnapRealm structures are created under the catalogue, represent that the catalogue can be as a part for snapshot tree.
S13：Traversed up from current directory and search the parent directory containing SnapRealm structures, by current directory
In the open_children containers of SnapRealm structures insertion parent directory SnapRealm structures；By parent directory
SnapRealm structures are arranged to the parent structures of the SnapRealm structures of current directory.
The step is the process being adjusted to snapshot tree construction.
Traversing up parent directory of the lookup containing SnapRealm structures from current directory is due to, if current directory
Higher level's catalogue does not contain SnapRealm structures, then higher level's catalogue is not in snapshot tree construction, so needing to traverse up to look into
Higher level's parent directory containing SnapRealm structures is looked for, for ease of the relation of snapshot tree construction in the clearly present invention, by father's mesh
Record SnapRealm structures are arranged to the parent structures of the SnapRealm structures of current directory.The root mesh of system directory
Be in record acquiescence containing SnapRealm structures, so traverse up lookup from current directory, can find containing
The parent directory of SnapRealm structures.
Meanwhile the SnapRealm structures of current directory are inserted to the open_ of parent directory SnapRealm structures
In children containers, such a higher level's snapshot tree construction parent and subordinate children constitute a clear and definite snapshot
Tree construction.The open_children is a structure container, relative to upper and lower two-stage catalogue, is present in higher level's catalogue, under
Its SnapRealm structure is inserted into the open_children containers by level catalogue, the SnapRealm of such higher level's catalogue
The just information containing subprime directory in structure, it is only necessary to the information of higher level's catalogue is inquired about, the information of subprime directory can be known,
Searched without traversal downwards, while whether there is snapshot in subprime directory also can quickly learn.
In a kind of specific embodiment of the present invention, it can also include after step S12：
Judge to whether there is SnapRealm structures in the subprime directory of current directory；
If so, the SnapRealm structures in subprime directory are inserted to the SnapRealm structures of current directory
In open_children containers.
If containing SnapRealm structures in subordinate's snapshot tree structure category of current directory, need snapshot
The structure of tree is adjusted, and the open_children that the SnapRealm structures in subprime directory are inserted into current directory holds
In device, the level structure up and down of current directory and its subprime directory, which has just adjusted, to be finished, and also needs to change current directory accordingly
The open_children that whole SnapRealm structures in open_children containers afterwards are inserted into higher level's catalogue holds
Covered in device.
In a kind of specific embodiment of the present invention, it should also include after above-mentioned steps：
Before SnapRealm structures are created, if its subprime directory and higher level's catalogue have been set up current directory
Parent and children the superior and the subordinate's snapshot tree construction, except needing to adjust the SnapRealm by subprime directory in structure
In the open_children containers of structure insertion current directory, then open_children after current directory is changed holds
Whole SnapRealm structures in device are inserted into covered in the open_children containers of higher level's catalogue after, because herein
Subprime directory and higher level's catalogue have been set up parent and children the superior and the subordinate's snapshot tree construction before, thus need by
The parent that subprime directory points to higher level's catalogue of current directory is changed to current directory, and the parent of current directory should also be pointed to
Its higher level's snapshot tree structure category.
In a kind of specific embodiment of the present invention, it can also include after step S11 to step S13：
To carry out snapshot operation to catalogue, then snapshot metadata is stored in the SnapRealm structures of catalogues at different levels
Srnode fields in snaps in.When so inquiring about the information of certain first class catalogue, the information of its higher level's catalogue need to be only inquired about,
The information of a certain catalogue can be inquired.
Fig. 2 is refer to, a kind of establishment file system snapshot tree that Fig. 2 is provided for a kind of embodiment of the present invention
System structure diagram.
A kind of specific embodiment of the present invention additionally provides a kind of system of establishment file system snapshot tree, the system bag
Include：
Judge module 21, it whether there is SnapRealm structures in the inode metadata for judging current directory；
Creation module 22, during in the inode metadata of current directory without SnapRealm structures, according to current
The inode metadata of catalogue creates SnapRealm structures；
Operation module 23, the parent directory containing SnapRealm structures is searched for being traversed up from current directory, ought
In the open_children containers of the SnapRealm structures insertion parent directory SnapRealm structures of preceding catalogue；
Definition module 24, for parent directory SnapRealm structures to be arranged to the SnapRealm structures of current directory
Parent structures.
Further, including：Judge module 21 is additionally operable to：Judge to whether there is in the subprime directory of current directory
SnapRealm structures；
Operation module 22 is additionally operable to：By the SnapRealm of the SnapRealm structures insertion current directory in subprime directory
In the open_children containers of structure.
Further, operation module 22 is additionally operable to：If the parent structures of subprime directory SnapRealm structures are in father
In catalogue, then the parent structures of subprime directory SnapRealm structures are changed to the SnapRealm structures of current directory
Body.
Further, in addition to：Memory module 25, for when carrying out snapshot operation to catalogue, the snapshot of catalogue to be believed
Breath is stored in the snaps in the srnode fields of SnapRealm structures.
Illustrate below and the course of work of said system is illustrated：
First, it is determined that module 21 in the inode metadata of current directory with the presence or absence of SnapRealm structures to sentencing
It is disconnected；When judge module 21 judges that the inode metadata of current directory creates SnapRealm structures, the basis of creation module 22
The inode metadata of current directory creates SnapRealm structures.After the completion of creation module 22 creates SnapRealm structures,
Parent directory SnapRealm structures are arranged to the parent structures of the SnapRealm structures of current directory by definition module 24
Body.
In an embodiment of the present invention, judge module 21 is additionally operable to judge whether deposited in the subprime directory of current directory
In SnapRealm structures.
In an embodiment of the present invention, judge module 21 judges exist in the subprime directory of current directory
SnapRealm structures, and the SnapRealm structures of the subprime directory higher level's catalogue with current directory in snapshot tree knot
Parent and children relation are established on structure, then operation module 22 ties the SnapRealm of the subprime directory of current directory
In the open_children containers of structure body insertion current directory, the SnapRealm structures of current directory are inserted into higher level's mesh
In the open_children containers of record, the parent relations that this grade of catalogue is pointed to higher level's catalogue of current directory are changed to point to
Current directory.
Just the structural adjustment to snapshot tree is completed.
Finally, snapshot operation is if desired carried out, the metadata information of snapshot operation is stored in by memory module 25
In snaps in the srnode fields of SnapRealm structures.
In summary, a kind of method and system of establishment file system snapshot tree provided by the present invention, this method include：
Judge to whether there is SnapRealm structures in the inode metadata of current directory；If it is not, according to the inode of current directory members
Data creation SnapRealm structures；Traversed up from current directory and search the parent directory containing SnapRealm structures, will
In the open_children containers of the SnapRealm structures insertion parent directory SnapRealm structures of current directory.Ought
The SnapRealm structures of preceding catalogue, insert to traverse up from current directory and search the parent directory containing SnapRealm structures
In the open_children containers of SnapRealm structures, parent directory SnapRealm structures are arranged to current directory
The parent structures of SnapRealm structures.By such parent and open_children parent-child structure relation,
When the snapshot in file system to be inquired about, as long as the snapshot metadata stored in the SnapRealm structures of inquiry parent directory
Information, it is not necessary to all catalogues of one-level one-level inquiry file system, if the catalogue quantity solved in file system is excessive
When, inquire about file system in all snapshots just take the problem of, improve inquiry snapshot efficiency；Meanwhile when inquiring about snapshot,
It can determine whether there is snapshot in catalogue by whether there is SnapRealm structures in the inode metadata of query directory, and
Because open_children containers contain the SnapRealm structures of subprime directory in the SnapRealm structures of parent directory,
So scheme provided by the present invention can also be simple and quick judge whether there is snapshot in higher level's catalogue and subprime directory.
A kind of method and system of establishment file system snapshot tree provided by the present invention are described in detail above.
Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is simply used
Understand the method and its core concept of the present invention in help.It should be pointed out that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these are improved and modification
Fall into the protection domain of the claims in the present invention.
Claims (8)
- A kind of 1. method of establishment file system snapshot tree, it is characterised in that including：Judge to whether there is SnapRealm structures in the inode metadata of current directory；If it is not, SnapRealm structures are created according to the inode metadata of the current directory；Traversed up from the current directory and search the parent directory containing SnapRealm structures, by the current directory SnapRealm structures are inserted in the open_children containers of the parent directory SnapRealm structures；The parent directory SnapRealm structures are arranged to the parent knots of the SnapRealm structures of the current directory Structure body.
- 2. according to the method for claim 1, it is characterised in that inserted by the SnapRealm structures of the current directory After entering in the open_children containers of the parent directory SnapRealm structures, in addition to：Judge to whether there is SnapRealm structures in the subprime directory of the current directory；If so, the SnapRealm structures in the subprime directory are inserted to the SnapRealm structures of the current directory In open_children containers.
- 3. according to the method for claim 2, it is characterised in that by the SnapRealm structures in the subprime directory Also include before inserting in the open_children containers of the SnapRealm structures of the current directory：If the parent structures of the subprime directory SnapRealm structures are in the parent directory, by subordinate's mesh The parent structures of record SnapRealm structures are changed to the SnapRealm structures of the current directory.
- 4. according to the method described in any one of claims 1 to 3, it is characterised in that also include：When carrying out snapshot operation to catalogue, the SNAPSHOT INFO of catalogue is stored in the srnode fields of SnapRealm structures In snaps in.
- A kind of 5. system of establishment file system snapshot tree, it is characterised in that including：Judge module, it whether there is SnapRealm structures in the inode metadata for judging current directory；Creation module, during in the inode metadata of current directory without SnapRealm structures, according to the current mesh The inode metadata of record creates SnapRealm structures；Operation module, the parent directory containing SnapRealm structures is searched for being traversed up from the current directory, by described in The SnapRealm structures of current directory are inserted in the open_children containers of the parent directory SnapRealm structures；Definition module, for the parent directory SnapRealm structures to be arranged to the SnapRealm structures of the current directory The parent structures of body.
- 6. system according to claim 5, it is characterised in that the judge module is additionally operable to：Judge the current directory Subprime directory in whether there is SnapRealm structures；The operation module is additionally operable to：SnapRealm structures in the subprime directory are inserted into the current directory In the open_children containers of SnapRealm structures.
- 7. system according to claim 6, it is characterised in that the operation module is additionally operable to：If the subprime directory The parent structures of SnapRealm structures are in the parent directory, then by the subprime directory SnapRealm structures Parent structures are changed to the SnapRealm structures of the current directory.
- 8. according to the system described in any one of claim 5 to 7, it is characterised in that also include：Memory module, for when carrying out snapshot operation to catalogue, the SNAPSHOT INFO of catalogue to be stored in into SnapRealm structures Srnode fields in snaps in.
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| CN113515487A (en) * | 2021-09-07 | 2021-10-19 | 联想凌拓科技有限公司 | Directory query method, computing device and distributed file system |
| CN117130980A (en) * | 2023-10-24 | 2023-11-28 | 杭州优云科技有限公司 | Virtual machine snapshot management method and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111309264A (en) * | 2020-02-16 | 2020-06-19 | 苏州浪潮智能科技有限公司 | Method, system, device and medium for making directory quota compatible with snapshot |
| CN111309264B (en) * | 2020-02-16 | 2022-08-09 | 苏州浪潮智能科技有限公司 | Method, system, device and medium for making directory quota compatible with snapshot |
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| CN117130980A (en) * | 2023-10-24 | 2023-11-28 | 杭州优云科技有限公司 | Virtual machine snapshot management method and device |
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