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==========================================================================
Inode quota
==========================================================================
= Currently, the only way to retrieve the number of files/objects in a =
= directory or volume is to do a crawl of the entire directory/volume. =
= This is expensive and is not scalable. =
= =
= The proposed mechanism will provide an easier alternative to determine =
= the count of files/objects in a directory or volume. =
= =
= The new mechanism proposes to store count of objects/files as part of =
= an extended attribute of a directory. Each directory's extended =
= attribute value will indicate the number of files/objects present =
= in a tree with the directory being considered as the root of the tree. =
= =
= The count value can be accessed by performing a getxattr(). =
= Cluster translators like afr, dht and stripe will perform aggregation =
= of count values from various bricks when getxattr() happens on the key =
= associated with file/object count. =
A new interface is introduced:
------------------------------
limit-objects : limit the number of inodes at directory level
list-objects : list the directories where the limit is set
remove-objects : remove the limit from the directory
==========================================================================
CLI COMMAND:
gluster volume quota <volname> limit-objects <path> <number> [<percent>]
* <number> is a hard-limit for number of objects limitation for path "<path>"
If hard-limit is exceeded, creation of file/directory is no longer
permitted.
* <percent> is a soft-limit for number of objects creation for path "<path>"
If soft-limit is exceeded, a warning is issued for each creation.
CLI COMMAND:
gluster volume quota <volname> remove-objects [path]
==========================================================================
CLI COMMAND:
gluster volume quota <volname> list-objects [path] ...
Sample output:
------------------
Path Hard-limit Soft-limit Used Available
Soft-limit exceeded?
Hard-limit exceeded?
------------------------------------------------------------------------
--------------------------------------
/dir 10 80% 10 0
Yes
Yes
==========================================================================
[root@snapshot-28 dir]# ls
a b file11 file12 file13 file14 file15 file16 file17
[root@snapshot-28 dir]# touch a1
touch: cannot touch `a1': Disk quota exceeded
* Nine files are created in directory "dir" and directory is included in
* the
count too. Hence the limit "10" is reached and further file creation
fails
==========================================================================
Note: We have also done some re-factoring in cli for volume name
validation. New function cli_validate_volname is created
==========================================================================
Change-Id: I1823497de4f790a2a20ebb1770293472ea33ee2b
BUG: 1190108
Signed-off-by: Sachin Pandit <spandit@redhat.com>
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/9769
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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