/**
* Get service name (svname) from string
* rc < 0 on error
* if endptr isn't NULL it is set to end of fsname *
*/
int server_name2svname(const char *label, char *svname, const char **endptr,
size_t svsize)
{
int rc;
const char *dash;
/* We use server_name2fsname() just for parsing */
rc = server_name2fsname(label, NULL, &dash);
if (rc != 0)
return rc;
if (endptr != NULL)
*endptr = dash;
if (strlcpy(svname, dash + 1, svsize) >= svsize)
return -E2BIG;
return 0;
}
/* Get the index from the obd name.
rc = server type, or
rc < 0 on error
if endptr isn't NULL it is set to end of name */
static int server_name2index(const char *svname, __u32 *idx,
const char **endptr)
{
unsigned long index;
int rc;
const char *dash;
/* We use server_name2fsname() just for parsing */
rc = server_name2fsname(svname, NULL, &dash);
if (rc != 0)
return rc;
dash++;
if (strncmp(dash, "MDT", 3) == 0)
rc = LDD_F_SV_TYPE_MDT;
else if (strncmp(dash, "OST", 3) == 0)
rc = LDD_F_SV_TYPE_OST;
else
return -EINVAL;
dash += 3;
if (strncmp(dash, "all", 3) == 0) {
if (endptr != NULL)
*endptr = dash + 3;
return rc | LDD_F_SV_ALL;
}
index = simple_strtoul(dash, (char **)endptr, 16);
if (idx != NULL)
*idx = index;
/* Account for -mdc after index that is possible when specifying mdt */
if (endptr != NULL && strncmp(LUSTRE_MDC_NAME, *endptr + 1,
sizeof(LUSTRE_MDC_NAME)-1) == 0)
*endptr += sizeof(LUSTRE_MDC_NAME);
return rc;
}
/*
* Create a new qsd_instance to be associated with backend osd device
* identified by \dev.
*
* \param env - the environment passed by the caller
* \param svname - is the service name of the OSD device creating this instance
* \param dev - is the dt_device where to store quota index files
* \param osd_proc - is the procfs parent directory where to create procfs file
* related to this new qsd instance
*
* \retval - pointer to new qsd_instance associated with dev \dev on success,
* appropriate error on failure
*/
struct qsd_instance *qsd_init(const struct lu_env *env, char *svname,
struct dt_device *dev,
cfs_proc_dir_entry_t *osd_proc)
{
struct qsd_thread_info *qti = qsd_info(env);
struct qsd_instance *qsd;
int rc, type, idx;
ENTRY;
/* only configure qsd for MDT & OST */
type = server_name2index(svname, &idx, NULL);
if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST)
RETURN(NULL);
/* allocate qsd instance */
OBD_ALLOC_PTR(qsd);
if (qsd == NULL)
RETURN(ERR_PTR(-ENOMEM));
/* generic initializations */
rwlock_init(&qsd->qsd_lock);
CFS_INIT_LIST_HEAD(&qsd->qsd_link);
thread_set_flags(&qsd->qsd_upd_thread, SVC_STOPPED);
init_waitqueue_head(&qsd->qsd_upd_thread.t_ctl_waitq);
CFS_INIT_LIST_HEAD(&qsd->qsd_upd_list);
spin_lock_init(&qsd->qsd_adjust_lock);
CFS_INIT_LIST_HEAD(&qsd->qsd_adjust_list);
qsd->qsd_prepared = false;
qsd->qsd_started = false;
/* copy service name */
if (strlcpy(qsd->qsd_svname, svname, sizeof(qsd->qsd_svname))
>= sizeof(qsd->qsd_svname))
GOTO(out, rc = -E2BIG);
/* grab reference on osd device */
lu_device_get(&dev->dd_lu_dev);
lu_ref_add(&dev->dd_lu_dev.ld_reference, "qsd", qsd);
qsd->qsd_dev = dev;
/* we only support pool ID 0 (default data or metadata pool) for the
* time being. A different pool ID could be assigned to this target via
* the configuration log in the future */
qsd->qsd_pool_id = 0;
/* get fsname from svname */
rc = server_name2fsname(svname, qti->qti_buf, NULL);
if (rc) {
CERROR("%s: fail to extract filesystem name\n", svname);
GOTO(out, rc);
}
/* look up quota setting for the filesystem the target belongs to */
qsd->qsd_fsinfo = qsd_get_fsinfo(qti->qti_buf, 1);
if (qsd->qsd_fsinfo == NULL) {
CERROR("%s: failed to locate filesystem information\n", svname);
GOTO(out, rc = -EINVAL);
}
/* add in the list of lquota_fsinfo */
mutex_lock(&qsd->qsd_fsinfo->qfs_mutex);
list_add_tail(&qsd->qsd_link, &qsd->qsd_fsinfo->qfs_qsd_list);
mutex_unlock(&qsd->qsd_fsinfo->qfs_mutex);
/* register procfs directory */
qsd->qsd_proc = lprocfs_seq_register(QSD_DIR, osd_proc,
lprocfs_quota_qsd_vars, qsd);
if (IS_ERR(qsd->qsd_proc)) {
rc = PTR_ERR(qsd->qsd_proc);
qsd->qsd_proc = NULL;
CERROR("%s: fail to create quota slave proc entry (%d)\n",
svname, rc);
GOTO(out, rc);
}
EXIT;
out:
if (rc) {
qsd_fini(env, qsd);
return ERR_PTR(rc);
}
RETURN(qsd);
}
