glusterfsd: allow subdir mount

Changes:

1. Take subdir mount option in client (mount.gluster / glusterfsd)
2. Pass the subdir mount to server-handshake (from client-handshake)
3. Handle subdir-mount dir's lookup in server-first-lookup and handle
   all fops resolution accordingly with proper gfid of subdir
4. Change the auth/addr module to handle the multiple subdir entries
   in option, and valid parsing.

How to use the feature:

`# mount -t glusterfs $hostname:/$volname/$subdir /$mount_point`
Or
`# mount -t glusterfs $hostname:/$volname -osubdir_mount=$subdir /$mount_point`

Option can be set like:

`# gluster volume set <volname> auth.allow "/subdir1(192.168.1.*),/(192.168.10.*),/subdir2(192.168.8.*)"`

Updates #175

Change-Id: I7ea57f76ddbe6c3862cfe02e13f89e8a39719e11
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: https://review.gluster.org/17141
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/xlators/protocol/client/src/client-handshake.c b/xlators/protocol/client/src/client-handshake.c
index a36f6e435a7..b6dc0797dd9 100644
--- a/xlators/protocol/client/src/client-handshake.c
+++ b/xlators/protocol/client/src/client-handshake.c
@@ -1137,13 +1137,20 @@ client_setvolume_cbk (struct rpc_req *req, struct iovec *iov, int count, void *m
         if (op_ret < 0) {
                 gf_msg (this->name, GF_LOG_ERROR, op_errno,
                         PC_MSG_SETVOLUME_FAIL,
-                        "SETVOLUME on remote-host failed");
+                        "SETVOLUME on remote-host failed: %s", remote_error);
+
                 errno = op_errno;
                 if (remote_error &&
                     (strcmp ("Authentication failed", remote_error) == 0)) {
                         auth_fail = _gf_true;
                         op_ret = 0;
                 }
+                if ((op_errno == ENOENT) && this->ctx->cmd_args.subdir_mount) {
+                        /* A case of subdir not being present at the moment,
+                           ride on auth_fail framework to notify the error */
+                        auth_fail = _gf_true;
+                        op_ret = 0;
+                }
                 if (op_errno == ESTALE) {
                         ret = client_notify_dispatch (this,
                                                       GF_EVENT_VOLFILE_MODIFIED,
@@ -1377,6 +1384,18 @@ client_setvolume (xlator_t *this, struct rpc_clnt *rpc)
                                 "'volfile-checksum'");
         }
 
+        if (this->ctx->cmd_args.subdir_mount) {
+                ret = dict_set_str (options, "subdir-mount",
+                                    this->ctx->cmd_args.subdir_mount);
+                if (ret) {
+                        gf_log (THIS->name, GF_LOG_ERROR,
+                                "Failed to set subdir_mount");
+                        /* It makes sense to fail, as per the CLI, we
+                           should be doing a subdir_mount */
+                        goto fail;
+                }
+        }
+
         ret = dict_set_int16 (options, "clnt-lk-version",
                               client_get_lk_ver (conf));
         if (ret < 0) {