core: Log level changes do not effect on running client process

Problem: commit c34e4161f3cb6539ec83a9020f3d27eb4759a975 set log-level
         per xlator during reconfigure only for a brick process not for
         the client process.

Solution: 1) Change per xlator log-level only if brick_mux is enabled.To make sure
             about brick multiplex introudce a flag brick_mux at ctx->cmd_args.

Note: There are two other changes done with this patch
      1) Ignore client-log-level option to attach a brick with
         already running brick if brick_mux is enabled
      2) Add a log to print pid of the running process to make easier
         debugging

> Change-Id: I39e85de778e150d0685cd9a79425ce8b4783f9c9
> Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>
> Fixes: bz#1696046
> (Cherry picked from commit 798aadbe51a9a02dd98a0f861cc239ecf7c8ed57)
> (Reviewed on upstream link https://review.gluster.org/#/c/glusterfs/+/22495/)

Change-Id: If91682830f894ab8f6857f19dcb1797fc15ca64c
Fixes: bz#1699715
Signed-off-by: Mohit Agrawal <moagrawal@redhat.com>

glusterfsd/src/glusterfsd-messages.h

@@ -35,6 +35,7 @@ GLFS_MSGID(GLUSTERFSD, glusterfsd_msg_1, glusterfsd_msg_2, glusterfsd_msg_3,
            glusterfsd_msg_28, glusterfsd_msg_29, glusterfsd_msg_30,
            glusterfsd_msg_31, glusterfsd_msg_32, glusterfsd_msg_33,
            glusterfsd_msg_34, glusterfsd_msg_35, glusterfsd_msg_36,
-           glusterfsd_msg_37, glusterfsd_msg_38, glusterfsd_msg_39);
+           glusterfsd_msg_37, glusterfsd_msg_38, glusterfsd_msg_39,
+           glusterfsd_msg_40);
 
 #endif /* !_GLUSTERFSD_MESSAGES_H_ */

glusterfsd/src/glusterfsd.c

@@ -275,6 +275,7 @@ static struct argp_option gf_options[] = {
      "attribute, dentry and page-cache. "
      "Disable this only if same files/directories are not accessed across "
      "two different mounts concurrently [default: \"on\"]"},
+    {"brick-mux", ARGP_BRICK_MUX_KEY, 0, 0, "Enable brick mux. "},
     {0, 0, 0, 0, "Miscellaneous Options:"},
     {
         0,
@@ -711,7 +712,6 @@ create_fuse_mount(glusterfs_ctx_t *ctx)
     xlator_t *master = NULL;
 
     cmd_args = &ctx->cmd_args;
-
     if (!cmd_args->mount_point) {
         gf_msg_trace("glusterfsd", 0,
                      "mount point not found, not a client process");
@@ -1099,6 +1099,10 @@ parse_opts(int key, char *arg, struct argp_state *state)
             cmd_args->thin_client = _gf_true;
             break;
 
+        case ARGP_BRICK_MUX_KEY:
+            cmd_args->brick_mux = _gf_true;
+            break;
+
         case ARGP_PID_FILE_KEY:
             cmd_args->pid_file = gf_strdup(arg);
             break;
@@ -1216,7 +1220,6 @@ parse_opts(int key, char *arg, struct argp_state *state)
         case ARGP_KEY_ARG:
             if (state->arg_num >= 1)
                 argp_usage(state);
-
             cmd_args->mount_point = gf_strdup(arg);
             break;
 
@@ -2549,6 +2552,8 @@ postfork:
         if (ret)
             goto out;
     }
+    gf_log("glusterfs", GF_LOG_INFO, "Pid of current running process is %d",
+           getpid());
     ret = gf_log_inject_timer_event(ctx);
 
     glusterfs_signals_setup(ctx);
@@ -2814,6 +2819,14 @@ main(int argc, char *argv[])
     if (ret)
         goto out;
 
+    /* set brick_mux mode only for server process */
+    if ((ctx->process_mode != GF_SERVER_PROCESS) && cmd->brick_mux) {
+        gf_msg("glusterfs", GF_LOG_CRITICAL, 0, glusterfsd_msg_40,
+               "command line argument --brick-mux is valid only for brick "
+               "process");
+        goto out;
+    }
+
     /* log the version of glusterfs running here along with the actual
        command line options. */
     {

glusterfsd/src/glusterfsd.h

@@ -111,6 +111,7 @@ enum argp_option_keys {
     ARGP_FUSE_FLUSH_HANDLE_INTERRUPT_KEY = 189,
     ARGP_FUSE_LRU_LIMIT_KEY = 190,
     ARGP_FUSE_AUTO_INVAL_KEY = 191,
+    ARGP_BRICK_MUX_KEY = 192
 };
 
 struct _gfd_vol_top_priv {

libglusterfs/src/glusterfs/glusterfs.h

@@ -575,6 +575,7 @@ struct _cmd_args {
 
     int fuse_flush_handle_interrupt;
     int fuse_auto_inval;
+    bool brick_mux;
 };
 typedef struct _cmd_args cmd_args_t;
 

tests/bugs/glusterd/bug-1696046.t

@@ -0,0 +1,113 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+cleanup;
+
+function count_up_bricks {
+        $CLI --xml volume status $1 | grep '<status>1' | wc -l
+}
+
+function count_brick_processes {
+        pgrep glusterfsd | wc -l
+}
+
+logdir=`gluster --print-logdir`
+
+## Start and create a volume
+TEST glusterd;
+TEST pidof glusterd;
+
+TEST $CLI volume set all cluster.brick-multiplex on
+TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{1,2,3};
+TEST $CLI volume create $V1 replica 3 $H0:$B0/${V1}{1,2,3};
+
+## Start volume and verify
+TEST $CLI volume start $V0;
+EXPECT 'Started' volinfo_field $V0 'Status';
+TEST $CLI volume start $V1;
+EXPECT 'Started' volinfo_field $V1 'Status';
+
+
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 4 count_up_bricks $V0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 4 count_up_bricks $V1
+
+EXPECT 1 count_brick_processes
+
+# Mount V0
+TEST glusterfs --volfile-id=$V0 --volfile-server=$H0 --entry-timeout=0 $M0;
+
+function client-log-file-name()
+{
+    logfilename=$M0".log"
+    echo ${logfilename:1} | tr / -
+}
+
+function brick-log-file-name()
+{
+    logfilename=$B0"/"$V0"1.log"
+    echo ${logfilename:1} | tr / -
+}
+
+log_file=$logdir"/"`client-log-file-name`
+nofdlog=$(cat $log_file | grep " D " | wc -l)
+TEST [ $((nofdlog)) -eq 0 ]
+
+brick_log_file=$logdir"/bricks/"`brick-log-file-name`
+nofdlog=$(cat $brick_log_file | grep " D " | wc -l)
+TEST [ $((nofdlog)) -eq 0 ]
+
+## Set brick-log-level to DEBUG
+TEST $CLI volume set $V0 diagnostics.brick-log-level DEBUG
+
+# Do some operation
+touch $M0/file1
+
+# Check debug message debug message should be exist only for V0
+# Server xlator is common in brick_mux so after enabling DEBUG log
+# some debug message should be available for other xlators like posix
+
+brick_log_file=$logdir"/bricks/"`brick-log-file-name`
+nofdlog=$(cat $brick_log_file | grep file1 | grep -v server | wc -l)
+TEST [ $((nofdlog)) -ne 0 ]
+
+#Check if any debug log exist in client-log file
+nofdlog=$(cat $log_file | grep " D " | wc -l)
+TEST [ $((nofdlog)) -eq 0 ]
+
+## Set brick-log-level to INFO
+TEST $CLI volume set $V0 diagnostics.brick-log-level INFO
+
+## Set client-log-level to DEBUG
+TEST $CLI volume set $V0 diagnostics.client-log-level DEBUG
+
+# Do some operation
+touch $M0/file2
+
+nofdlog=$(cat $brick_log_file | grep " D " | grep file2 | wc -l)
+TEST [ $((nofdlog)) -eq 0 ]
+
+nofdlog=$(cat $log_file | grep " D " | wc -l)
+TEST [ $((nofdlog)) -ne 0 ]
+
+# Unmount V0
+TEST umount $M0
+
+#Mount V1
+TEST glusterfs --volfile-id=$V1 --volfile-server=$H0 --entry-timeout=0 $M0;
+
+#do some operation
+touch $M0/file3
+
+
+# DEBUG log level is enabled only for V0 so no debug message should be available
+# in log specific to file2 creation except for server xlator, server xlator is
+# common xlator in brick mulitplex
+nofdlog=$(cat $brick_log_file | grep file3 | grep -v server | wc -l)
+TEST [ $((nofdlog)) -eq 0 ]
+
+# Unmount V1
+TEST umount $M0
+
+cleanup;

xlators/debug/io-stats/src/io-stats.c

@@ -3704,19 +3704,23 @@ xlator_set_loglevel(xlator_t *this, int log_level)
     active = ctx->active;
     top = active->first;
 
-    if (strcmp(top->type, "protocol/server") || (log_level == -1))
+    if (log_level == -1)
         return;
 
-    /* Set log-level for server xlator */
-    top->loglevel = log_level;
+    if (ctx->cmd_args.brick_mux) {
+        /* Set log-level for all brick xlators */
+        top->loglevel = log_level;
 
-    /* Set log-level for parent xlator */
-    if (this->parents)
-        this->parents->xlator->loglevel = log_level;
+        /* Set log-level for parent xlator */
+        if (this->parents)
+            this->parents->xlator->loglevel = log_level;
 
-    while (trav) {
-        trav->loglevel = log_level;
-        trav = trav->next;
+        while (trav) {
+            trav->loglevel = log_level;
+            trav = trav->next;
+        }
+    } else {
+        gf_log_set_loglevel(this->ctx, log_level);
     }
 }
 

xlators/mgmt/glusterd/src/glusterd-utils.c

@@ -2229,6 +2229,9 @@ retry:
     if (volinfo->memory_accounting)
         runner_add_arg(&runner, "--mem-accounting");
 
+    if (is_brick_mx_enabled())
+        runner_add_arg(&runner, "--brick-mux");
+
     runner_log(&runner, "", 0, "Starting GlusterFS");
 
     brickinfo->port = port;
@@ -2367,6 +2370,10 @@ unsafe_option(dict_t *this, char *key, data_t *value, void *arg)
         return _gf_false;
     }
 
+    if (fnmatch("*diagnostics.client-log*", key, 0) == 0) {
+        return _gf_false;
+    }
+
     return _gf_true;
 }