Bug 1457202

+++ This bug was initially created as a clone of Bug #1455022 +++

Description of problem:

Use of force with volume create or volume start, creates brick directory even it is not present

Version-Release number of selected component (if applicable):

RHGS 3.2

How reproducible:

Everytime

Steps to Reproduce:
1. Run command gluster v create vol1 xx.xx.xx.xx:/test force
2. Even if /test is not present on xx.xx.xx.xx, it will create this path on root
3.Same thing is reproducible with gluster v start vol1

Actual results:

Use of force with volume create or volume start creates brick directory even it is not present

Expected results:

Use of force should not create brick directory if it is not present

Additional info:


--- Additional comment from Atin Mukherjee on 2017-05-24 01:28:47 EDT ---

force flag is being used in CLI/GlusterD to ensure we can bypass certain validations. So without a force option we don't allow the bricks to be created in root partition, but with force we do. Also please note, when volume create is executed, we always try to create the brickpath if it doesn't exist, if it do we just skip that part.

int                                                                                  
glusterd_validate_and_create_brickpath (glusterd_brickinfo_t *brickinfo,             
                                        uuid_t volume_id, char **op_errstr,     
                                        gf_boolean_t is_force,                       
                                        gf_boolean_t ignore_partition)               
{                                                                                    
        int          ret                 = -1;                                       
        char         parentdir[PATH_MAX] = {0,};                                     
        struct stat  parent_st           = {0,};                                     
        struct stat  brick_st            = {0,};                                     
        struct stat  root_st             = {0,};                                     
        char         msg[2048]           = {0,};                                     
        gf_boolean_t is_created          = _gf_false;                                
                                                                                     
        ret = sys_mkdir (brickinfo->path, 0777);                                     
        if (ret) {                                                                   
                if (errno != EEXIST) {                                               
                        snprintf (msg, sizeof (msg), "Failed to create brick "  
                                  "directory for brick %s:%s. Reason : %s ",    
                                  brickinfo->hostname, brickinfo->path,              
                                  strerror (errno));                                 
                        goto out;                                                    
                }                                                                    
        } else {                                                                     
                is_created = _gf_true;                                               
        }   
        ........
        ........

}

This is an expected behavior.

--- Additional comment from Atin Mukherjee on 2017-05-24 03:15:44 EDT ---

While the expectation of creating the directory (even in root partition) with volume create force is valid, but we do have a bug in volume start force codepath where the brick is getting recreated. GlusterD actually doesn't create this brick path. We have an issue in the index xlator here.

index_dir_create ()

int                                                                                 
index_dir_create (xlator_t *this, const char *subdir)                               
{                                                                                   
        int          ret = 0;                                                       
        struct       stat st = {0};                                                 
        char         fullpath[PATH_MAX] = {0};                                      
        char         path[PATH_MAX] = {0};                                          
        char         *dir = NULL;                                                   
        index_priv_t *priv = NULL;                                                  
        size_t       len = 0;                                                       
        size_t       pathlen = 0;                                                   
                                                                                    
        priv = this->private;                                                       
        make_index_dir_path (priv->index_basepath, subdir, fullpath,                
                             sizeof (fullpath));                                    
        ret = sys_stat (fullpath, &st);                                             
        if (!ret) {                                                                 
                if (!S_ISDIR (st.st_mode))                                          
                        ret = -2;                                                   
                goto out;                                                           
        }                                                                           
                                                                                    
        pathlen = strlen (fullpath);                                                
        if ((pathlen > 1) && fullpath[pathlen - 1] == '/')                          
                fullpath[pathlen - 1] = '\0';                                       
        dir = strchr (fullpath, '/');                                               
        while (dir) {                                                               
                dir = strchr (dir + 1, '/');                                        
                if (dir)                                                            
                        len = pathlen - strlen (dir);                               
                else                                                                
                        len = pathlen;                                              
                strncpy (path, fullpath, len);                                      
                path[len] = '\0';                                                   
                ret = sys_mkdir (path, 0600);  ====> this is actually creating the brickpath.                                      
                if (ret && (errno != EEXIST))                                                                                                                                                                                                 
                        goto out;                                                   
        }                                                                           
        ret = 0;                                                                    
out:                                                                                
        if (ret == -1) {                                                            
                gf_msg (this->name, GF_LOG_ERROR, errno,                            
                        INDEX_MSG_INDEX_DIR_CREATE_FAILED, "%s/%s: Failed to "  
                        "create", priv->index_basepath, subdir);                    
        } else if (ret == -2) {                                                     
                gf_msg (this->name, GF_LOG_ERROR, ENOTDIR,                          
                        INDEX_MSG_INDEX_DIR_CREATE_FAILED, "%s/%s: Failed to "  
                        "create, path exists, not a directory ",                    
                        priv->index_basepath, subdir);                              
        }                                                                           
        return ret;                                                                 
}