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, 18 insertions, 8 deletions

diff --git a/xlators/features/quota/src/quota.h b/xlators/features/quota/src/quota.h
index ac08a040d8a..c61c974e352 100644
--- a/xlators/features/quota/src/quota.h
+++ b/xlators/features/quota/src/quota.h
@@ -25,7 +25,6 @@
 #include "logging.h"
 #include "dict.h"
 #include "stack.h"
-#include "common-utils.h"
 #include "event.h"
 #include "globals.h"
 #include "rpcsvc.h"
@@ -36,6 +35,7 @@
 #include "xdr-generic.h"
 #include "compat-errno.h"
 #include "protocol-common.h"
+#include "quota-common-utils.h"
 
 #define DIRTY                   "dirty"
 #define SIZE                    "size"
@@ -169,6 +169,10 @@ struct quota_inode_ctx {
         int64_t          size;
         int64_t          hard_lim;
         int64_t          soft_lim;
+        int64_t          file_count;
+        int64_t          dir_count;
+        int64_t          object_hard_lim;
+        int64_t          object_soft_lim;
         struct iatt      buf;
         struct list_head parents;
         struct timeval   tv;
@@ -178,12 +182,6 @@ struct quota_inode_ctx {
 };
 typedef struct quota_inode_ctx quota_inode_ctx_t;
 
-struct quota_limit {
-        int64_t hard_lim;
-        int64_t soft_lim_percent;
-} __attribute__ ((packed));
-typedef struct quota_limit quota_limit_t;
-
 typedef void
 (*quota_ancestry_built_t) (struct list_head *parents, inode_t *inode,
                            int32_t op_ret, int32_t op_errno, void *data);
@@ -210,7 +208,8 @@ struct quota_local {
         uuid_t                  common_ancestor; /* Used by quota_rename */
         call_stub_t            *stub;
         struct iobref          *iobref;
-        quota_limit_t           limit;
+        quota_limits_t          limit;
+        quota_limits_t          object_limit;
         int64_t                 space_available;
         quota_ancestry_built_t  ancestry_cbk;
         void                   *ancestry_data;
@@ -261,4 +260,15 @@ int
 quota_fill_inodectx (xlator_t *this, inode_t *inode, dict_t *dict,
                      loc_t *loc, struct iatt *buf, int32_t *op_errno);
 
+int32_t
+quota_check_size_limit (call_frame_t *frame, quota_inode_ctx_t *ctx,
+                          quota_priv_t *priv, inode_t *_inode, xlator_t *this,
+                          int32_t *op_errno, int just_validated, int64_t delta,
+                          quota_local_t *local, gf_boolean_t *skip_check);
+
+int32_t
+quota_check_object_limit (call_frame_t *frame, quota_inode_ctx_t *ctx,
+                          quota_priv_t *priv, inode_t *_inode, xlator_t *this,
+                          int32_t *op_errno, int just_validated,
+                          quota_local_t *local, gf_boolean_t *skip_check);
 #endif