gfapi/handleops: Introducing glfs_xreaddirplus_r() fop for handleops

Its known that readdirplus operation fetches stat as well for each of the
dirents. But often applications may need extra information, like for eg.,
NFS-Ganesha which operates on handles needs handles for each of those
dirents returned. So this would require extra calls to the backend, in this
case LOOKUP (which is very expensive operation) resulting in very low
readdir performance.

To address that introducing this new API using which applications can
make request for any extra information to be returned as part of
readdirplus response.

Currently this new api returns stat and handles as demanded by application.
The synopsis of the API is noted in glfs.h.

@todo:
* Enhance test script using this new API

Below were the perf results on single brick volume with and without
these changes -

Dataset used -
10*100 directories and each directory containing 100 empty files.

I used NFS-Ganesha application to test these changes -
>for i in {1..5}; do systemctl restart nfs-ganesha; sleep 10; mount -t nfs -o vers=4 localhost:/brick_vol /mnt; cd /mnt; echo "ITERATION$i"; date; find . > tmp-nfs.log; date; cd /; umount /mnt; sleep 2; done;

Without these changes -
ITERATION1
Mon Mar 20 17:22:26 IST 2017
Mon Mar 20 17:23:18 IST 2017
ITERATION2
Mon Mar 20 17:23:39 IST 2017
Mon Mar 20 17:24:28 IST 2017
ITERATION3
Mon Mar 20 17:24:49 IST 2017
Mon Mar 20 17:25:36 IST 2017
ITERATION4
Mon Mar 20 17:30:57 IST 2017
Mon Mar 20 17:31:37 IST 2017
ITERATION5
Mon Mar 20 17:31:57 IST 2017
Mon Mar 20 17:32:40 IST 2017
[root@dhcp35-197 /]#

On an average ~46.2 sec

With these changes applied -
ITERATION1
Mon Mar 20 17:35:03 IST 2017
Mon Mar 20 17:35:15 IST 2017
ITERATION2
Mon Mar 20 17:35:36 IST 2017
Mon Mar 20 17:35:46 IST 2017
ITERATION3
Mon Mar 20 17:36:06 IST 2017
Mon Mar 20 17:36:17 IST 2017
ITERATION4
Mon Mar 20 17:41:38 IST 2017
Mon Mar 20 17:41:49 IST 2017
ITERATION5
Mon Mar 20 17:42:10 IST 2017
Mon Mar 20 17:42:20 IST 2017

On an average ~10.8 sec

Updates #174
BUG: 1442950
Change-Id: I0f74f74dc62085ca4c4a23c38e3edc84bd850876
Signed-off-by: Soumya Koduri <skoduri@redhat.com>
Reviewed-on: https://review.gluster.org/15663
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/api/src/glfs-internal.h b/api/src/glfs-internal.h
index a42822420ea..6b964b57304 100644
--- a/api/src/glfs-internal.h
+++ b/api/src/glfs-internal.h
@@ -245,6 +245,12 @@ struct glfs_upcall_inode {
         struct stat           oldp_buf; /* Latest stat of old parent dir handle */
 };
 
+struct glfs_xreaddirp_stat {
+        struct stat st; /* Stat for that dirent - corresponds to GFAPI_XREADDIRP_STAT */
+        struct glfs_object *object; /* handled for GFAPI_XREADDIRP_HANDLE */
+        uint32_t flags_handled; /* final set of flags successfulyy handled */
+};
+
 #define DEFAULT_EVENT_POOL_SIZE           16384
 #define GF_MEMPOOL_COUNT_OF_DICT_T        4096
 #define GF_MEMPOOL_COUNT_OF_DATA_T        (GF_MEMPOOL_COUNT_OF_DICT_T * 4)
@@ -445,7 +451,6 @@ glfs_anonymous_pwritev (struct glfs *fs, struct glfs_object *object,
 struct glfs_object *
 glfs_h_resolve_symlink (struct glfs *fs, struct glfs_object *object);
 
-
 /* Deprecated structures that were passed to client applications, replaced by
  * accessor functions. Do not use these in new applications, and update older
  * usage.
@@ -475,5 +480,13 @@ struct glfs_callback_inode_arg {
         struct stat             oldp_buf; /* Latest stat of old parent
                                            * dir handle */
 };
+struct dirent *
+glfs_readdirbuf_get (struct glfs_fd *glfd);
+
+gf_dirent_t *
+glfd_entry_next (struct glfs_fd *glfd, int plus);
+
+void
+gf_dirent_to_dirent (gf_dirent_t *gf_dirent, struct dirent *dirent);
 
 #endif /* !_GLFS_INTERNAL_H */