Viewing: qsd_lib.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2012, 2017, Intel Corporation.
* Use is subject to license terms.
*/
/*
* 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().
*
* Author: Johann Lombardi <johann.lombardi@intel.com>
* Author: Niu Yawei <yawei.niu@intel.com>
*/
#define DEBUG_SUBSYSTEM S_LQUOTA
#include <obd_class.h>
#include "qsd_internal.h"
struct kmem_cache *upd_kmem;
static struct lu_kmem_descr qsd_caches[] = {
{
.ckd_cache = &upd_kmem,
.ckd_name = "upd_kmem",
.ckd_size = sizeof(struct qsd_upd_rec)
},
{
.ckd_cache = NULL
}
};
/* define qsd thread key */
LU_KEY_INIT_FINI(qsd, struct qsd_thread_info);
LU_CONTEXT_KEY_DEFINE(qsd, LCT_MD_THREAD | LCT_MG_THREAD | LCT_DT_THREAD | LCT_LOCAL);
LU_KEY_INIT_GENERIC(qsd);
/* some procfs helpers */
static int qsd_state_seq_show(struct seq_file *m, void *data)
{
struct qsd_instance *qsd = m->private;
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 (qsd_type_enabled(qsd, PRJQUOTA))
strncat(enabled, "p", 1);
if (strlen(enabled) == 0)
strcat(enabled, "none");
/* TODO: further pool ID should be removed or
* replaced with pool Name */
seq_printf(m, "target name: %s\n"
"pool ID: %d\n"
"type: %s\n"
"quota enabled: %s\n"
"conn to master: %s\n"
"glimpse_refresh: %d\n",
qsd->qsd_svname, 0,
qsd->qsd_is_md ? "md" : "dt", enabled,
qsd->qsd_exp_valid ? "setup" : "not setup yet",
qsd->qsd_glimpse_refresh);
if (qsd->qsd_prepared) {
memset(enabled, 0, sizeof(enabled));
if (qsd->qsd_type_array[USRQUOTA]->qqi_acct_obj != NULL)
strcat(enabled, "u");
if (qsd->qsd_type_array[GRPQUOTA]->qqi_acct_obj != NULL)
strcat(enabled, "g");
if (qsd->qsd_type_array[PRJQUOTA]->qqi_acct_obj != NULL)
strncat(enabled, "p", 1);
if (strlen(enabled) == 0)
strcat(enabled, "none");
seq_printf(m, "space acct: %s\n"
"user uptodate: glb[%d],slv[%d],reint[%d]\n"
"group uptodate: glb[%d],slv[%d],reint[%d]\n"
"project uptodate: glb[%d],slv[%d],reint[%d]\n",
enabled,
qsd->qsd_type_array[USRQUOTA]->qqi_glb_uptodate,
qsd->qsd_type_array[USRQUOTA]->qqi_slv_uptodate,
qsd->qsd_type_array[USRQUOTA]->qqi_reint,
qsd->qsd_type_array[GRPQUOTA]->qqi_glb_uptodate,
qsd->qsd_type_array[GRPQUOTA]->qqi_slv_uptodate,
qsd->qsd_type_array[GRPQUOTA]->qqi_reint,
qsd->qsd_type_array[PRJQUOTA]->qqi_glb_uptodate,
qsd->qsd_type_array[PRJQUOTA]->qqi_slv_uptodate,
qsd->qsd_type_array[PRJQUOTA]->qqi_reint);
}
return 0;
}
LPROC_SEQ_FOPS_RO(qsd_state);
static int qsd_enabled_seq_show(struct seq_file *m, void *data)
{
struct qsd_instance *qsd = m->private;
char enabled[5] = "";
int types = 0;
LASSERT(qsd != NULL);
memset(enabled, 0, sizeof(enabled));
if (qsd_type_enabled(qsd, USRQUOTA))
enabled[types++] = 'u';
if (qsd_type_enabled(qsd, GRPQUOTA))
enabled[types++] = 'g';
if (qsd_type_enabled(qsd, PRJQUOTA))
enabled[types++] = 'p';
if (!types)
strncpy(enabled, "none", 4);
seq_printf(m, "%s\n", enabled);
return 0;
}
static ssize_t qsd_enabled_seq_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct qsd_instance *qsd = m->private;
char fsname[LUSTRE_MAXFSNAME + 1];
int enabled = 0;
char valstr[5];
int pool, rc;
if (count > 4)
return -E2BIG;
if (copy_from_user(valstr, buffer, count))
GOTO(out, count = -EFAULT);
valstr[sizeof(valstr) - 1] = 0;
if (strchr(valstr, 'u'))
enabled |= BIT(USRQUOTA);
if (strchr(valstr, 'g'))
enabled |= BIT(GRPQUOTA);
if (strchr(valstr, 'p'))
enabled |= BIT(PRJQUOTA);
if (enabled == 0 && strcmp(valstr, "none"))
GOTO(out, count = -EINVAL);
if (qsd->qsd_is_md)
pool = LQUOTA_RES_MD;
else
pool = LQUOTA_RES_DT;
if (server_name2fsname(qsd->qsd_svname, fsname, NULL))
GOTO(out, count = -EINVAL);
rc = qsd_config(valstr, fsname, pool);
if (rc)
count = rc;
out:
return count;
}
LPROC_SEQ_FOPS(qsd_enabled);
/* force reintegration procedure to be executed.
* Used for test/debugging purpose */
static ssize_t
lprocfs_force_reint_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct qsd_instance *qsd = m->private;
int rc = 0, qtype;
LASSERT(qsd != NULL);
write_lock(&qsd->qsd_lock);
if (qsd->qsd_stopping) {
/* don't mess up with shutdown procedure, it is already
* complicated enough */
rc = -ESHUTDOWN;
} else if (!qsd->qsd_prepared) {
rc = -EAGAIN;
} else {
/* mark all indexes as stale */
for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
qsd->qsd_type_array[qtype]->qqi_glb_uptodate = false;
qsd->qsd_type_array[qtype]->qqi_slv_uptodate = false;
}
}
write_unlock(&qsd->qsd_lock);
if (rc)
return rc;
/* kick off reintegration */
for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
rc = qsd_start_reint_thread(qsd->qsd_type_array[qtype]);
if (rc)
break;
}
return rc == 0 ? count : rc;
}
LPROC_SEQ_FOPS_WR_ONLY(qsd, force_reint);
static int qsd_timeout_seq_show(struct seq_file *m, void *data)
{
struct qsd_instance *qsd = m->private;
LASSERT(qsd != NULL);
seq_printf(m, "%d\n", qsd_wait_timeout(qsd));
return 0;
}
static ssize_t
qsd_timeout_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct qsd_instance *qsd = m->private;
time64_t timeout;
int rc;
LASSERT(qsd != NULL);
rc = kstrtoll_from_user(buffer, count, 0, &timeout);
if (rc)
return rc;
if (timeout < 0)
return -EINVAL;
qsd->qsd_timeout = timeout;
return count;
}
LPROC_SEQ_FOPS(qsd_timeout);
static int qsd_ver_reint_timeout_seq_show(struct seq_file *m, void *data)
{
struct qsd_instance *qsd = m->private;
LASSERT(qsd != NULL);
seq_printf(m, "%d\n", qsd->qsd_ver_reint_timeout);
return 0;
}
static ssize_t
qsd_ver_reint_timeout_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct qsd_instance *qsd = m->private;
time64_t timeout;
int rc;
LASSERT(qsd != NULL);
rc = kstrtoll_from_user(buffer, count, 0, &timeout);
if (rc)
return rc;
if (timeout < 0)
return -EINVAL;
qsd->qsd_ver_reint_timeout = timeout;
return count;
}
LPROC_SEQ_FOPS(qsd_ver_reint_timeout);
static int qsd_root_prj_enable_seq_show(struct seq_file *m, void *data)
{
struct qsd_instance *qsd = m->private;
LASSERT(qsd != NULL);
seq_printf(m, "%d\n", qsd->qsd_root_prj_enable);
return 0;
}
static ssize_t
qsd_root_prj_enable_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct qsd_instance *qsd = m->private;
bool enable;
int rc;
LASSERT(qsd != NULL);
rc = kstrtobool_from_user(buffer, count, &enable);
if (rc)
return rc;
qsd->qsd_root_prj_enable = enable;
return count;
}
LPROC_SEQ_FOPS(qsd_root_prj_enable);
static struct lprocfs_vars lprocfs_quota_qsd_vars[] = {
{ .name = "info",
.fops = &qsd_state_fops },
{ .name = "enabled",
.fops = &qsd_enabled_fops },
{ .name = "force_reint",
.fops = &qsd_force_reint_fops },
{ .name = "timeout",
.fops = &qsd_timeout_fops },
{ .name = "verion_mismatch_timeout",
.fops = &qsd_ver_reint_timeout_fops },
{ .name = "root_prj_enable",
.fops = &qsd_root_prj_enable_fops },
{ NULL }
};
/*
* Callback function invoked by the OSP layer when the connection to the master
* has been set up.
*
* \param data - is a pointer to the qsd_instance
*
* \retval - 0 on success, appropriate error on failure
*/
static int qsd_conn_callback(void *data)
{
struct qsd_instance *qsd = (struct qsd_instance *)data;
int type;
ENTRY;
/* qsd_exp should now be valid */
LASSERT(qsd->qsd_exp);
qsd->qsd_ns = class_exp2obd(qsd->qsd_exp)->obd_namespace;
write_lock(&qsd->qsd_lock);
/* notify that qsd_exp is now valid */
qsd->qsd_exp_valid = true;
write_unlock(&qsd->qsd_lock);
/* Now that the connection to master is setup, we can initiate the
* reintegration procedure for quota types which are enabled.
* It is worth noting that, if the qsd_instance hasn't been started
* already, then we can only complete the first two steps of the
* reintegration procedure (i.e. global lock enqueue and slave
* index transfer) since the space usage reconciliation (i.e.
* step 3) will have to wait for qsd_start() to be called */
for (type = USRQUOTA; type < LL_MAXQUOTAS; type++) {
struct qsd_qtype_info *qqi = qsd->qsd_type_array[type];
struct task_struct *t;
/* qqi_reint_task can be set to NULL at any time,
* so we need to be careful.
*/
rcu_read_lock();
t = rcu_dereference(qqi->qqi_reint_task);
if (t)
wake_up_process(t);
rcu_read_unlock();
}
RETURN(0);
}
/*
* Release qsd_qtype_info structure which contains data associated with a
* given quota type. This releases the accounting objects.
* It's called on OSD cleanup when the qsd instance is released.
*
* \param env - is the environment passed by the caller
* \param qsd - is the qsd instance managing the qsd_qtype_info structure
* to be released
* \param qtype - is the quota type to be shutdown
*/
static void qsd_qtype_fini(const struct lu_env *env, struct qsd_instance *qsd,
int qtype)
{
struct qsd_qtype_info *qqi;
int repeat = 0;
ENTRY;
if (qsd->qsd_type_array[qtype] == NULL)
RETURN_EXIT;
qqi = qsd->qsd_type_array[qtype];
qsd->qsd_type_array[qtype] = NULL;
/* all deferred work lists should be empty */
LASSERT(list_empty(&qqi->qqi_deferred_glb));
LASSERT(list_empty(&qqi->qqi_deferred_slv));
/* shutdown lquota site */
if (qqi->qqi_site != NULL && !IS_ERR(qqi->qqi_site)) {
lquota_site_free(env, qqi->qqi_site);
qqi->qqi_site = NULL;
}
/* The qqi may still be holding by global locks which are being
* canceled asynchronously (LU-4365), see the following steps:
*
* - On server umount, we try to clear all quota locks first by
* disconnecting LWP (which will invalidate import and cleanup
* all locks on it), however, if quota reint process is holding
* the global lock for reintegration at that time, global lock
* will fail to be cleared on LWP disconnection.
*
* - Umount process goes on and stops reint process, the global
* lock will be dropped on reint process exit, however, the lock
* cancel in done in asynchronous way, so the
* qsd_glb_blocking_ast() might haven't been called yet when we
* get here.
*/
while (atomic_read(&qqi->qqi_ref) > 1) {
CDEBUG(D_QUOTA, "qqi reference count %u, repeat: %d\n",
atomic_read(&qqi->qqi_ref), repeat);
repeat++;
schedule_timeout_interruptible(cfs_time_seconds(1));
}
/* by now, all qqi users should have gone away */
LASSERT(atomic_read(&qqi->qqi_ref) == 1);
/* release accounting object */
if (qqi->qqi_acct_obj != NULL && !IS_ERR(qqi->qqi_acct_obj)) {
dt_object_put(env, qqi->qqi_acct_obj);
qqi->qqi_acct_obj = NULL;
}
/* release slv index */
if (qqi->qqi_slv_obj != NULL && !IS_ERR(qqi->qqi_slv_obj)) {
dt_object_put(env, qqi->qqi_slv_obj);
qqi->qqi_slv_obj = NULL;
qqi->qqi_slv_ver = 0;
}
/* release global index */
if (qqi->qqi_glb_obj != NULL && !IS_ERR(qqi->qqi_glb_obj)) {
dt_object_put(env, qqi->qqi_glb_obj);
qqi->qqi_glb_obj = NULL;
qqi->qqi_glb_ver = 0;
}
OBD_FREE_PTR(qqi);
EXIT;
}
static const char *qtype2acct_name(int qtype)
{
static char unknown[24];
switch (qtype) {
case USRQUOTA:
return "acct_user";
case GRPQUOTA:
return "acct_group";
case PRJQUOTA:
return "acct_project";
}
snprintf(unknown, sizeof(unknown), "acct_unknown_%u", qtype);
return unknown;
}
static const char *qtype2glb_name(int qtype)
{
static char unknown[24];
switch (qtype) {
case USRQUOTA:
return "limit_user";
case GRPQUOTA:
return "limit_group";
case PRJQUOTA:
return "limit_project";
}
snprintf(unknown, sizeof(unknown), "acct_unknown_%u", qtype);
return unknown;
}
/*
* 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_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
* qsd_qtype_info instance.
* \param qtype - is quota type to set up
*
* \retval - 0 on success and qsd->qsd_type_array[qtype] is allocated,
* appropriate error on failure
*/
static int qsd_qtype_init(const struct lu_env *env, struct qsd_instance *qsd,
int qtype)
{
struct qsd_qtype_info *qqi;
int rc;
struct obd_uuid uuid;
ENTRY;
LASSERT(qsd->qsd_type_array[qtype] == NULL);
/* allocate structure for this quota type */
OBD_ALLOC_PTR(qqi);
if (qqi == NULL)
RETURN(-ENOMEM);
qsd->qsd_type_array[qtype] = qqi;
atomic_set(&qqi->qqi_ref, 1); /* referenced from qsd */
/* set backpointer and other parameters */
qqi->qqi_qsd = qsd;
qqi->qqi_qtype = qtype;
qqi->qqi_glb_uptodate = false;
qqi->qqi_slv_uptodate = false;
qqi->qqi_reint = false;
INIT_LIST_HEAD(&qqi->qqi_deferred_glb);
INIT_LIST_HEAD(&qqi->qqi_deferred_slv);
lquota_generate_fid(&qqi->qqi_fid, QSD_RES_TYPE(qsd), qtype);
/* open accounting object */
LASSERT(qqi->qqi_acct_obj == NULL);
qqi->qqi_acct_obj = acct_obj_lookup(env, qsd->qsd_dev, qtype);
if (IS_ERR(qqi->qqi_acct_obj)) {
CDEBUG(D_QUOTA, "%s: no %s space accounting support: rc = %ld\n",
qsd->qsd_svname, qtype_name(qtype),
PTR_ERR(qqi->qqi_acct_obj));
qqi->qqi_acct_obj = NULL;
qqi->qqi_acct_failed = true;
}
/* open global index copy */
LASSERT(qqi->qqi_glb_obj == NULL);
qqi->qqi_glb_obj = lquota_disk_glb_find_create(env, qsd->qsd_dev,
qsd->qsd_root,
&qqi->qqi_fid, true);
if (IS_ERR(qqi->qqi_glb_obj)) {
CERROR("%s: can't open global index copy "DFID" %ld\n",
qsd->qsd_svname, PFID(&qqi->qqi_fid),
PTR_ERR(qqi->qqi_glb_obj));
GOTO(out, rc = PTR_ERR(qqi->qqi_glb_obj));
}
qqi->qqi_glb_ver = dt_version_get(env, qqi->qqi_glb_obj);
/* open slave index copy */
LASSERT(qqi->qqi_slv_obj == NULL);
obd_str2uuid(&uuid, qsd->qsd_svname);
qqi->qqi_slv_obj = lquota_disk_slv_find_create(env, qsd->qsd_dev,
qsd->qsd_root,
&qqi->qqi_fid, &uuid,
true);
if (IS_ERR(qqi->qqi_slv_obj)) {
CERROR("%s: can't open slave index copy "DFID" %ld\n",
qsd->qsd_svname, PFID(&qqi->qqi_fid),
PTR_ERR(qqi->qqi_slv_obj));
GOTO(out, rc = PTR_ERR(qqi->qqi_slv_obj));
}
qqi->qqi_slv_ver = dt_version_get(env, qqi->qqi_slv_obj);
/* allocate site */
qqi->qqi_site = lquota_site_alloc(env, qqi, false, qtype, &qsd_lqe_ops);
if (IS_ERR(qqi->qqi_site)) {
CERROR("%s: can't allocate site "DFID" %ld\n", qsd->qsd_svname,
PFID(&qqi->qqi_fid), PTR_ERR(qqi->qqi_site));
GOTO(out, rc = PTR_ERR(qqi->qqi_site));
}
/* register proc entry for accounting & global index copy objects */
rc = lprocfs_seq_create(qsd->qsd_proc, qtype2acct_name(qtype),
0444, &lprocfs_quota_seq_fops,
qqi->qqi_acct_obj);
if (rc) {
CERROR("%s: can't add procfs entry for accounting file %d\n",
qsd->qsd_svname, rc);
GOTO(out, rc);
}
rc = lprocfs_seq_create(qsd->qsd_proc, qtype2glb_name(qtype),
0444, &lprocfs_quota_seq_fops,
qqi->qqi_glb_obj);
if (rc) {
CERROR("%s: can't add procfs entry for global index copy %d\n",
qsd->qsd_svname, rc);
GOTO(out, rc);
}
qqi->qqi_last_version_update_time = ktime_get_seconds();
EXIT;
out:
if (rc)
qsd_qtype_fini(env, qsd, qtype);
return rc;
}
/*
* Release a qsd_instance. Companion of qsd_init(). This releases all data
* structures associated with the quota slave (on-disk objects, lquota entry
* tables, ...).
* This function should be called when the OSD is shutting down.
*
* \param env - is the environment passed by the caller
* \param qsd - is the qsd instance to shutdown
*/
void qsd_fini(const struct lu_env *env, struct qsd_instance *qsd)
{
int qtype;
ENTRY;
if (unlikely(qsd == NULL))
RETURN_EXIT;
CDEBUG(D_QUOTA, "%s: initiating QSD shutdown\n", qsd->qsd_svname);
write_lock(&qsd->qsd_lock);
qsd->qsd_stopping = true;
write_unlock(&qsd->qsd_lock);
/* remove qsd proc entry */
if (qsd->qsd_proc != NULL) {
lprocfs_remove(&qsd->qsd_proc);
qsd->qsd_proc = NULL;
}
/* stop the writeback thread */
qsd_stop_upd_thread(qsd);
/* shutdown the reintegration threads */
for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
if (qsd->qsd_type_array[qtype] == NULL)
continue;
qsd_stop_reint_thread(qsd->qsd_type_array[qtype]);
}
if (qsd->qsd_ns != NULL) {
qsd->qsd_ns = NULL;
}
/* release per-filesystem information */
if (qsd->qsd_fsinfo != NULL) {
mutex_lock(&qsd->qsd_fsinfo->qfs_mutex);
/* remove from the list of fsinfo */
list_del_init(&qsd->qsd_link);
mutex_unlock(&qsd->qsd_fsinfo->qfs_mutex);
qsd_put_fsinfo(qsd->qsd_fsinfo);
qsd->qsd_fsinfo = NULL;
}
/* free per-quota type data */
for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++)
qsd_qtype_fini(env, qsd, qtype);
/* deregister connection to the quota master */
qsd->qsd_exp_valid = false;
lustre_deregister_lwp_item(&qsd->qsd_exp);
/* release quota root directory */
if (qsd->qsd_root != NULL) {
dt_object_put(env, qsd->qsd_root);
qsd->qsd_root = NULL;
}
/* release reference on dt_device */
if (qsd->qsd_dev != NULL) {
lu_device_put(&qsd->qsd_dev->dd_lu_dev);
qsd->qsd_dev = NULL;
}
CDEBUG(D_QUOTA, "%s: QSD shutdown completed\n", qsd->qsd_svname);
OBD_FREE_PTR(qsd);
EXIT;
}
EXPORT_SYMBOL(qsd_fini);
/*
* 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,
struct proc_dir_entry *osd_proc,
bool is_md, bool excl)
{
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);
INIT_LIST_HEAD(&qsd->qsd_link);
INIT_LIST_HEAD(&qsd->qsd_upd_list);
spin_lock_init(&qsd->qsd_adjust_lock);
INIT_LIST_HEAD(&qsd->qsd_adjust_list);
qsd->qsd_prepared = false;
qsd->qsd_started = false;
qsd->qsd_is_md = is_md;
qsd->qsd_updating = false;
qsd->qsd_exclusive = excl;
qsd->qsd_ver_reint_timeout = 3 * obd_timeout;
/* copy service name */
rc = strscpy(qsd->qsd_svname, svname, sizeof(qsd->qsd_svname));
if (rc < 0)
GOTO(out, rc);
/* grab reference on osd device */
lu_device_get(&dev->dd_lu_dev);
qsd->qsd_dev = dev;
/* 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 */
if (qsd->qsd_is_md)
qsd->qsd_proc = lprocfs_register(QSD_DIR_MD, osd_proc,
lprocfs_quota_qsd_vars, qsd);
else
qsd->qsd_proc = lprocfs_register(QSD_DIR_DT, osd_proc,
lprocfs_quota_qsd_vars, qsd);
if (type == LDD_F_SV_TYPE_MDT && qsd->qsd_is_md)
lprocfs_add_symlink(QSD_DIR, osd_proc, "./%s", QSD_DIR_MD);
else if (type == LDD_F_SV_TYPE_OST && !qsd->qsd_is_md)
lprocfs_add_symlink(QSD_DIR, osd_proc, "./%s", QSD_DIR_DT);
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);
}
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)
{
struct qsd_thread_info *qti = qsd_info(env);
int qtype, rc = 0;
ENTRY;
if (unlikely(qsd == NULL))
RETURN(0);
read_lock(&qsd->qsd_lock);
if (qsd->qsd_prepared) {
CERROR("%s: qsd instance already prepared\n", qsd->qsd_svname);
rc = -EALREADY;
}
read_unlock(&qsd->qsd_lock);
if (rc)
RETURN(rc);
/* Record whether this qsd instance is managing quota enforcement for a
* MDT (i.e. inode quota) or OST (block quota) */
if (qsd->qsd_is_md)
qsd->qsd_sync_threshold = LQUOTA_LEAST_QUNIT(LQUOTA_RES_MD);
else
qsd->qsd_sync_threshold = LQUOTA_LEAST_QUNIT(LQUOTA_RES_DT);
/* 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 < LL_MAXQUOTAS; qtype++) {
rc = qsd_qtype_init(env, qsd, qtype);
if (rc)
RETURN(rc);
}
/* pools successfully setup, mark the qsd as prepared */
write_lock(&qsd->qsd_lock);
qsd->qsd_prepared = true;
write_unlock(&qsd->qsd_lock);
if (qsd->qsd_dev->dd_rdonly)
RETURN(0);
/* start reintegration thread for each type, if required */
for (qtype = USRQUOTA; qtype < LL_MAXQUOTAS; qtype++) {
struct qsd_qtype_info *qqi = qsd->qsd_type_array[qtype];
if (qsd_type_enabled(qsd, qtype) &&
qqi->qqi_acct_failed) {
LCONSOLE_ERROR("%s: can't enable quota enforcement since space accounting isn't functional"
". Please run tunefs.lustre --quota on an unmounted filesystem if not done "
"already\n", qsd->qsd_svname);
continue;
}
rc = qsd_start_reint_thread(qqi);
if (rc) {
CERROR("%s: failed to start reint thread for type %s: rc = %d\n",
qsd->qsd_svname, qtype_name(qtype), rc);
RETURN(rc);
}
}
/* start writeback thread */
rc = qsd_start_upd_thread(qsd);
if (rc) {
CERROR("%s: failed to start writeback thread (%d)\n",
qsd->qsd_svname, rc);
RETURN(rc);
}
/* generate osp name */
rc = tgt_name2lwp_name(qsd->qsd_svname, qti->qti_buf,
MTI_NAME_MAXLEN, 0);
if (rc) {
CERROR("%s: failed to generate ospname (%d)\n",
qsd->qsd_svname, rc);
RETURN(rc);
}
/* the connection callback will start the reintegration
* procedure if quota is enabled */
rc = lustre_register_lwp_item(qti->qti_buf, &qsd->qsd_exp,
qsd_conn_callback, (void *)qsd);
if (rc) {
CERROR("%s: fail to get connection to master (%d)\n",
qsd->qsd_svname, rc);
RETURN(rc);
}
RETURN(0);
}
EXPORT_SYMBOL(qsd_prepare);
/*
* Start a qsd instance. This will complete the last step of the reintegration
* procedure as soon as possible (provided that the master is reachable).
* This should be called when recovery has been completed and quota should now
* be enforced on every operations.
*
* \param env - the environment passed by the caller
* \param qsd - is the qsd instance associated with the osd device to start
*/
int qsd_start(const struct lu_env *env, struct qsd_instance *qsd)
{
int type, rc = 0;
ENTRY;
if (unlikely(qsd == NULL))
RETURN(0);
write_lock(&qsd->qsd_lock);
if (!qsd->qsd_prepared) {
CERROR("%s: can't start qsd instance since it wasn't properly initialized\n",
qsd->qsd_svname);
rc = -EFAULT;
} else if (qsd->qsd_started) {
CERROR("%s: qsd instance already started\n", qsd->qsd_svname);
rc = -EALREADY;
} else {
/* notify that the qsd_instance is now started */
qsd->qsd_started = true;
}
write_unlock(&qsd->qsd_lock);
if (rc)
RETURN(rc);
/* Trigger the 3rd step of reintegration: If usage > granted, acquire
* up to usage; If usage < granted, release down to usage. */
for (type = USRQUOTA; type < LL_MAXQUOTAS; type++) {
struct qsd_qtype_info *qqi = qsd->qsd_type_array[type];
struct task_struct *t;
/* qqi_reint_task can be set to NULL at any time,
* so we need to be careful.
*/
rcu_read_lock();
t = rcu_dereference(qqi->qqi_reint_task);
if (t)
wake_up_process(t);
rcu_read_unlock();
}
RETURN(rc);
}
EXPORT_SYMBOL(qsd_start);
/*
* Global initialization performed at module load time
*/
int qsd_glb_init(void)
{
int rc;
rc = lu_kmem_init(qsd_caches);
if (rc)
return rc;
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;
}
/*
* Companion of qsd_glb_init() called at module unload time
*/
void qsd_glb_fini(void)
{
lustre_register_quota_process_config(NULL);
lu_kmem_fini(qsd_caches);
lu_context_key_degister(&qsd_thread_key);
}
