features/quota : Introducing inode quota

==========================================================================
                             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>

1 files changed, 32 insertions, 0 deletions

diff --git a/cli/src/cli.c b/cli/src/cli.c
index 54236344569..66aa5858cf6 100644
--- a/cli/src/cli.c
+++ b/cli/src/cli.c
@@ -744,3 +744,35 @@ cli_print_line (int len)
 
         printf ("\n");
 }
+
+void
+print_quota_list_header (int type)
+{
+        if (type == GF_QUOTA_OPTION_TYPE_LIST) {
+                cli_out ("                  Path                   Hard-limit "
+                         "Soft-limit   Used  Available  Soft-limit exceeded?"
+                         " Hard-limit exceeded?");
+                cli_out ("-----------------------------------------------------"
+                         "-----------------------------------------------------"
+                         "-----------------");
+        } else {
+                cli_out ("                  Path                   Hard-limit  "
+                         "Soft-limit     Files       Dirs     Available  "
+                         "Soft-limit exceeded? Hard-limit exceeded?");
+                cli_out ("-----------------------------------------------------"
+                         "-----------------------------------------------------"
+                         "-----------------------------------");
+        }
+}
+
+void
+print_quota_list_empty (char *path, int type)
+{
+        if (type == GF_QUOTA_OPTION_TYPE_LIST)
+                cli_out ("%-40s %7s %9s %10s %7s %15s %20s", path,
+                         "N/A", "N/A", "N/A", "N/A", "N/A", "N/A");
+        else
+                cli_out ("%-40s %9s %9s %12s %10s %10s %15s %20s", path,
+                         "N/A", "N/A", "N/A", "N/A", "N/A", "N/A", "N/A");
+}
+