* GPL HEADER END
*/
/*
- * Copyright (c) 2012 Whamcloud, Inc.
+ * Copyright (c) 2012 Intel, Inc.
* Use is subject to license terms.
*
- * Author: Johann Lombardi <johann@whamcloud.com>
- * Author: Niu Yawei <niu@whamcloud.com>
+ * Author: Johann Lombardi <johann.lombardi@intel.com>
+ * Author: Niu Yawei <yawei.niu@intel.com>
*/
/*
* Quota Slave Driver (QSD) management.
+ *
+ * The quota slave feature is implemented under the form of a library called
+ * QSD. Each OSD device should create a QSD instance via qsd_init() which will
+ * be used to manage quota enforcement for this device. This implies:
+ * - completing the reintegration procedure with the quota master (aka QMT, see
+ * qmt_dev.c) to retrieve the latest quota settings and space distribution.
+ * - managing quota locks in order to be notified of configuration changes.
+ * - acquiring space from the QMT when quota space for a given user/group is
+ * close to exhaustion.
+ * - allocating quota space to service threads for local request processing.
+ *
+ * Once the QSD instance created, the OSD device should invoke qsd_start()
+ * when recovery is completed. This notifies the QSD that we are about to
+ * process new requests on which quota should be strictly enforced.
+ * Then, qsd_op_begin/end can be used to reserve/release/pre-acquire quota space
+ * for/after each operation until shutdown where the QSD instance should be
+ * freed via qsd_fini().
*/
#ifndef EXPORT_SYMTAB
#define DEBUG_SUBSYSTEM S_LQUOTA
+#include <obd_class.h>
#include "qsd_internal.h"
/* define qsd thread key */
qsd->qsd_is_md ? "md" : "dt");
}
+static int lprocfs_qsd_rd_enabled(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct qsd_instance *qsd = (struct qsd_instance *)data;
+ char enabled[5];
+ LASSERT(qsd != NULL);
+
+ memset(enabled, 0, sizeof(enabled));
+ if (qsd_type_enabled(qsd, USRQUOTA))
+ strcat(enabled, "u");
+ if (qsd_type_enabled(qsd, GRPQUOTA))
+ strcat(enabled, "g");
+ if (strlen(enabled) == 0)
+ strcat(enabled, "none");
+
+ return snprintf(page, count, "%s\n", enabled);
+}
+
static struct lprocfs_vars lprocfs_quota_qsd_vars[] = {
{ "info", lprocfs_qsd_rd_state, 0, 0},
+ { "enabled", lprocfs_qsd_rd_enabled, 0, 0},
{ NULL }
};
qqi = qsd->qsd_type_array[qtype];
qsd->qsd_type_array[qtype] = NULL;
+ /* by now, all qqi users should have gone away */
+ LASSERT(cfs_atomic_read(&qqi->qqi_ref) == 1);
+ lu_ref_fini(&qqi->qqi_reference);
+
/* release accounting object */
if (qqi->qqi_acct_obj != NULL && !IS_ERR(qqi->qqi_acct_obj)) {
lu_object_put(env, &qqi->qqi_acct_obj->do_lu);
/*
* Allocate and initialize a qsd_qtype_info structure for quota type \qtype.
* This opens the accounting object and initializes the proc file.
- * It's called on OSD start when the qsd instance is created.
+ * It's called on OSD start when the qsd_prepare() is invoked on the qsd
+ * instance.
*
* \param env - the environment passed by the caller
* \param qsd - is the qsd instance which will be in charge of the new
if (qqi == NULL)
RETURN(-ENOMEM);
qsd->qsd_type_array[qtype] = qqi;
+ cfs_atomic_set(&qqi->qqi_ref, 1); /* referenced from qsd */
/* set backpointer and other parameters */
qqi->qqi_qsd = qsd;
qqi->qqi_qtype = qtype;
+ lu_ref_init(&qqi->qqi_reference);
lquota_generate_fid(&qqi->qqi_fid, qsd->qsd_pool_id, QSD_RES_TYPE(qsd),
qtype);
+ qqi->qqi_glb_uptodate = false;
+ qqi->qqi_slv_uptodate = false;
+ qqi->qqi_reint = false;
+ memset(&qqi->qqi_lockh, 0, sizeof(qqi->qqi_lockh));
/* open accounting object */
LASSERT(qqi->qqi_acct_obj == NULL);
CDEBUG(D_QUOTA, "%s: initiating QSD shutdown\n", qsd->qsd_svname);
qsd->qsd_stopping = true;
+ /* remove from the list of fsinfo */
+ if (!cfs_list_empty(&qsd->qsd_link)) {
+ LASSERT(qsd->qsd_fsinfo != NULL);
+ cfs_down(&qsd->qsd_fsinfo->qfs_sem);
+ cfs_list_del_init(&qsd->qsd_link);
+ cfs_up(&qsd->qsd_fsinfo->qfs_sem);
+ }
+
/* remove qsd proc entry */
- if (qsd->qsd_proc != NULL && !IS_ERR(qsd->qsd_proc)) {
+ if (qsd->qsd_proc != NULL) {
lprocfs_remove(&qsd->qsd_proc);
qsd->qsd_proc = NULL;
}
for (qtype = USRQUOTA; qtype < MAXQUOTAS; qtype++)
qsd_qtype_fini(env, qsd, qtype);
+ /* release per-filesystem information */
+ if (qsd->qsd_fsinfo != NULL)
+ qsd_put_fsinfo(qsd->qsd_fsinfo);
+
/* release quota root directory */
- if (qsd->qsd_root != NULL && !IS_ERR(qsd->qsd_root)) {
+ if (qsd->qsd_root != NULL) {
lu_object_put(env, &qsd->qsd_root->do_lu);
qsd->qsd_root = NULL;
}
/*
* Create a new qsd_instance to be associated with backend osd device
- * identified by \dev. For now, this function just create procfs files which
- * dumps the accounting information
+ * identified by \dev.
*
* \param env - the environment passed by the caller
* \param svname - is the service name of the OSD device creating this instance
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, qtype;
+ int rc;
ENTRY;
/* allocate qsd instance */
if (qsd == NULL)
RETURN(ERR_PTR(-ENOMEM));
+ cfs_rwlock_init(&qsd->qsd_lock);
+ CFS_INIT_LIST_HEAD(&qsd->qsd_link);
/* copy service name */
strncpy(qsd->qsd_svname, svname, MAX_OBD_NAME);
* the configuration log in the future */
qsd->qsd_pool_id = 0;
- /* Record whether this qsd instance is managing quota enforcement for a
- * MDT (i.e. inode quota) or OST (block quota) */
- qsd->qsd_is_md = lu_device_is_md(dev->dd_lu_dev.ld_site->ls_top_dev);
-
- /* look-up on-disk directory for the quota slave */
- qsd->qsd_root = lquota_disk_dir_find_create(env, dev, NULL, QSD_DIR);
- if (IS_ERR(qsd->qsd_root)) {
- rc = PTR_ERR(qsd->qsd_root);
- CERROR("%s: failed to create quota slave root dir (%d)\n",
- svname, rc);
+ /* 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 */
+ cfs_down(&qsd->qsd_fsinfo->qfs_sem);
+ list_add_tail(&qsd->qsd_link, &qsd->qsd_fsinfo->qfs_qsd_list);
+ cfs_up(&qsd->qsd_fsinfo->qfs_sem);
+
/* register procfs directory */
qsd->qsd_proc = lprocfs_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);
}
-
- /* initialize per-quota type data */
- for (qtype = USRQUOTA; qtype < MAXQUOTAS; qtype++) {
- rc = qsd_qtype_init(env, qsd, qtype);
- if (rc)
- GOTO(out, rc);
- }
out:
if (rc) {
qsd_fini(env, qsd);
EXPORT_SYMBOL(qsd_init);
/*
+ * Initialize on-disk structures in order to manage quota enforcement for
+ * the target associated with the qsd instance \qsd and starts the reintegration
+ * procedure for each quota type as soon as possible.
+ * The last step of the reintegration will be completed once qsd_start() is
+ * called, at which points the space reconciliation with the master will be
+ * executed.
+ * This function must be called when the server stack is fully configured,
+ * typically when ->ldo_prepare is called across the stack.
+ *
+ * \param env - the environment passed by the caller
+ * \param qsd - is qsd_instance to prepare
+ *
+ * \retval - 0 on success, appropriate error on failure
+ */
+int qsd_prepare(const struct lu_env *env, struct qsd_instance *qsd)
+{
+ int rc, qtype;
+ ENTRY;
+
+ LASSERT(qsd != NULL);
+
+ /* Record whether this qsd instance is managing quota enforcement for a
+ * MDT (i.e. inode quota) or OST (block quota) */
+ if (lu_device_is_md(qsd->qsd_dev->dd_lu_dev.ld_site->ls_top_dev))
+ qsd->qsd_is_md = true;
+
+ /* look-up on-disk directory for the quota slave */
+ qsd->qsd_root = lquota_disk_dir_find_create(env, qsd->qsd_dev, NULL,
+ QSD_DIR);
+ if (IS_ERR(qsd->qsd_root)) {
+ rc = PTR_ERR(qsd->qsd_root);
+ qsd->qsd_root = NULL;
+ CERROR("%s: failed to create quota slave root dir (%d)\n",
+ qsd->qsd_svname, rc);
+ RETURN(rc);
+ }
+
+ /* initialize per-quota type data */
+ for (qtype = USRQUOTA; qtype < MAXQUOTAS; qtype++) {
+ rc = qsd_qtype_init(env, qsd, qtype);
+ if (rc)
+ RETURN(rc);
+ }
+
+ RETURN(0);
+}
+EXPORT_SYMBOL(qsd_prepare);
+
+void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg));
+
+/*
* Global initialization performed at module load time
*/
int qsd_glb_init(void)
{
qsd_key_init_generic(&qsd_thread_key, NULL);
lu_context_key_register(&qsd_thread_key);
+ lustre_register_quota_process_config(qsd_process_config);
return 0;
}
*/
void qsd_glb_fini(void)
{
+ lustre_register_quota_process_config(NULL);
lu_context_key_degister(&qsd_thread_key);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff