Quota/marker : Support for 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 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.

Currently file usage is accounted in marker by doing multiple FOPs
like setting and getting xattrs. Doing this with STACK WIND and
UNWIND can be harder to debug as involves multiple callbacks.
In this code we are replacing current mechanism with syncop approach
as syncop code is much simpler to follow and help us implement inode
quota in an organized way.

Change-Id: Ibf366fbe07037284e89a241ddaff7750fc8771b4
BUG: 1188636
Signed-off-by: vmallika <vmallika@redhat.com>
Signed-off-by: Sachin Pandit <spandit@redhat.com>
Reviewed-on: http://review.gluster.org/9567
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>

5 files changed, 85 insertions, 1 deletions

diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 8d7659b5015..a810f3a81f0 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -128,11 +128,12 @@
 #define GLUSTERFS_POSIXLK_COUNT "glusterfs.posixlk-count"
 #define GLUSTERFS_PARENT_ENTRYLK "glusterfs.parent-entrylk"
 #define GLUSTERFS_INODELK_DOM_COUNT "glusterfs.inodelk-dom-count"
-#define QUOTA_SIZE_KEY "trusted.glusterfs.quota.size"
 #define GFID_TO_PATH_KEY "glusterfs.gfid2path"
 #define GF_XATTR_STIME_PATTERN "trusted.glusterfs.*.stime"
 #define GF_XATTR_TRIGGER_SYNC "glusterfs.geo-rep.trigger-sync"
 
+#define QUOTA_SIZE_KEY "trusted.glusterfs.quota.size"
+
 /* Index xlator related */
 #define GF_XATTROP_INDEX_GFID "glusterfs.xattrop_index_gfid"
 #define GF_XATTROP_INDEX_COUNT "glusterfs.xattrop_index_count"
diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index e3321cf6ddb..e241e2c1ee0 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -2537,3 +2537,39 @@ syncop_inodelk (xlator_t *subvol, const char *volume, loc_t *loc, int32_t cmd,
 
         return args.op_ret;
 }
+
+int32_t
+syncop_xattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *dict,
+                    dict_t *xdata)
+{
+        struct syncargs *args = NULL;
+
+        args = cookie;
+
+        args->op_ret   = op_ret;
+        args->op_errno = op_errno;
+
+        if (xdata)
+                args->xdata = dict_ref (xdata);
+
+        __wake (args);
+
+        return 0;
+
+}
+
+int
+syncop_xattrop (xlator_t *subvol, loc_t *loc, gf_xattrop_flags_t flags,
+                dict_t *dict, dict_t *xdata)
+{
+        struct syncargs args = {0, };
+
+        SYNCOP (subvol, (&args), syncop_xattrop_cbk, subvol->fops->xattrop,
+                loc, flags, dict, xdata);
+
+        if (args.op_ret < 0)
+                return -args.op_errno;
+
+        return args.op_ret;
+}
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 7f8ec7345b0..a9244a51552 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -439,4 +439,8 @@ syncop_inodelk (xlator_t *subvol, const char *volume, loc_t *loc, int32_t cmd,
 int
 syncop_ipc (xlator_t *subvol, int op, dict_t *xdata_in, dict_t **xdata_out);
 
+int
+syncop_xattrop (xlator_t *subvol, loc_t *loc, gf_xattrop_flags_t flags,
+                dict_t *dict, dict_t *xdata);
+
 #endif /* _SYNCOP_H */
diff --git a/libglusterfs/src/xlator.c b/libglusterfs/src/xlator.c
index 49af7d2e0e6..cc4726e0ea5 100644
--- a/libglusterfs/src/xlator.c
+++ b/libglusterfs/src/xlator.c
@@ -860,9 +860,51 @@ loc_is_root (loc_t *loc)
         } else if (loc && loc->inode && __is_root_gfid (loc->inode->gfid)) {
                 return _gf_true;
         }
+
         return _gf_false;
 }
 
+int32_t
+loc_build_child (loc_t *child, loc_t *parent, char *name)
+{
+        int32_t  ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("xlator", child, out);
+        GF_VALIDATE_OR_GOTO ("xlator", parent, out);
+        GF_VALIDATE_OR_GOTO ("xlator", name, out);
+
+        loc_gfid (parent, child->pargfid);
+
+        if (strcmp (parent->path, "/") == 0)
+                ret = gf_asprintf ((char **)&child->path, "/%s", name);
+        else
+                ret = gf_asprintf ((char **)&child->path, "%s/%s", parent->path,
+                                   name);
+
+        if (ret < 0 || !child->path) {
+                ret = -1;
+                goto out;
+        }
+
+        child->name = strrchr (child->path, '/') + 1;
+
+        child->parent = inode_ref (parent->inode);
+        child->inode = inode_new (parent->inode->table);
+
+        if (!child->inode) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        if ((ret < 0) && child)
+                loc_wipe (child);
+
+        return ret;
+}
+
 int
 xlator_destroy (xlator_t *xl)
 {
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index e953ec04372..733f6cf47ab 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -960,6 +960,7 @@ int loc_path (loc_t *loc, const char *bname);
 void loc_gfid (loc_t *loc, uuid_t gfid);
 char* loc_gfid_utoa (loc_t *loc);
 gf_boolean_t loc_is_root (loc_t *loc);
+int32_t loc_build_child (loc_t *child, loc_t *parent, char *name);
 int xlator_mem_acct_init (xlator_t *xl, int num_types);
 int is_gf_log_command (xlator_t *trans, const char *name, char *value);
 int glusterd_check_log_level (const char *value);