/**
* Set threshold for "same space on all OSTs" rule.
*
* This sets the maximum percentage difference of free space between the most
* full and most empty OST in the currently available OSTs. If this percentage
* is exceeded, use the QoS allocator to select OSTs based on their available
* space so that more full OSTs are chosen less often, otherwise use the
* round-robin allocator for efficiency and performance.
* \param[in] file proc file
* \param[in] buffer string containing percentage difference of free space
* \param[in] count @buffer length
* \param[in] off unused for single entry
*
* \retval @count on success
* \retval negative error code if failed
*/
static ssize_t
lod_qos_thresholdrr_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct obd_device *dev = m->private;
struct lod_device *lod;
int rc;
__s64 val;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
rc = lprocfs_str_with_units_to_s64(buffer, count, &val, '%');
if (rc)
return rc;
if (val > 100 || val < 0)
return -EINVAL;
lod->lod_qos.lq_threshold_rr = (val << 8) / 100;
lod->lod_qos.lq_dirty = 1;
return count;
}
/**
* Set default number of stripes.
*
* \param[in] file proc file
* \param[in] buffer string containing the default number of stripes
* for new files
* \param[in] count @buffer length
* \param[in] off unused for single entry
*
* \retval @count on success
* \retval negative error code otherwise
*/
static ssize_t
lod_stripecount_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct obd_device *dev = m->private;
struct lod_device *lod;
int rc;
__s64 val;
__u32 stripe_count;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
rc = lprocfs_str_to_s64(buffer, count, &val);
if (rc)
return rc;
if (val < 0)
return -ERANGE;
stripe_count = val;
lod_fix_desc_stripe_count(&stripe_count);
lod->lod_desc.ld_default_stripe_count = stripe_count;
return count;
}
/**
* Show expiration period used to refresh cached statfs data, which
* is used to implement QoS/RR striping allocation algorithm.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_qos_maxage_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, "%u Sec\n", lod->lod_desc.ld_qos_maxage);
}
/**
* Show QoS priority parameter.
*
* The printed value is a percentage value (0-100%) indicating the priority
* of free space compared to performance. 0% means select OSTs equally
* regardless of their free space, 100% means select OSTs only by their free
* space even if it results in very imbalanced load on the OSTs.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_qos_priofree_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod = lu2lod_dev(dev->obd_lu_dev);
LASSERT(lod != NULL);
return seq_printf(m, "%d%%\n",
(lod->lod_qos.lq_prio_free * 100 + 255) >> 8);
}
/**
* Show number of active targets.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_activeobd_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, "%u\n", lod->lod_desc.ld_active_tgt_count);
}
/**
* Show default striping pattern (LOV_PATTERN_*).
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_stripetype_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, "%u\n", lod->lod_desc.ld_pattern);
}
/**
* Show UUID of LOD device.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_desc_uuid_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
seq_printf(m, "%s\n", lod->lod_desc.ld_uuid.uuid);
return 0;
}
/**
* Show default stripe size.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_stripesize_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, LPU64"\n",
lod->lod_desc.ld_default_stripe_size);
}
/**
* Show threshold for "same space on all OSTs" rule.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success
* \retval negative error code if failed
*/
static int lod_qos_thresholdrr_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, "%d%%\n",
(lod->lod_qos.lq_threshold_rr * 100 + 255) >> 8);
}
/**
* Show default number of stripes.
*
* \param[in] m seq file
* \param[in] v unused for single entry
*
* \retval 0 on success,
* \retval negative error code if failed
*/
static int lod_stripecount_seq_show(struct seq_file *m, void *v)
{
struct obd_device *dev = m->private;
struct lod_device *lod;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
return seq_printf(m, "%d\n",
(__s16)(lod->lod_desc.ld_default_stripe_count + 1) - 1);
}
/**
* Set default number of stripes.
*
* \param[in] file proc file
* \param[in] buffer string containing the default number of stripes
* for new files
* \param[in] count @buffer length
* \param[in] off unused for single entry
*
* \retval @count on success
* \retval negative error code otherwise
*/
static ssize_t
lod_stripecount_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct obd_device *dev = m->private;
struct lod_device *lod;
int val, rc;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
rc = lprocfs_write_helper(buffer, count, &val);
if (rc)
return rc;
lod_fix_desc_stripe_count(&val);
lod->lod_desc.ld_default_stripe_count = val;
return count;
}
/**
* Set expiration period used to refresh cached statfs data.
*
* \param[in] file proc file
* \param[in] buffer string contains maximum age of statfs data in seconds
* \param[in] count @buffer length
* \param[in] off unused for single entry
*
* \retval @count on success
* \retval negative error code if failed
*/
static ssize_t
lod_qos_maxage_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct obd_device *dev = m->private;
struct lustre_cfg_bufs bufs;
struct lod_device *lod;
struct lu_device *next;
struct lustre_cfg *lcfg;
char str[32];
unsigned int i;
int rc;
__s64 val;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
rc = lprocfs_str_to_s64(buffer, count, &val);
if (rc)
return rc;
if (val <= 0)
return -EINVAL;
lod->lod_desc.ld_qos_maxage = val;
/*
* propogate the value down to OSPs
*/
lustre_cfg_bufs_reset(&bufs, NULL);
snprintf(str, 32, "%smaxage=%u", PARAM_OSP, (__u32)val);
lustre_cfg_bufs_set_string(&bufs, 1, str);
lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
if (lcfg == NULL)
return -ENOMEM;
lod_getref(&lod->lod_ost_descs);
lod_foreach_ost(lod, i) {
next = &OST_TGT(lod,i)->ltd_ost->dd_lu_dev;
rc = next->ld_ops->ldo_process_config(NULL, next, lcfg);
if (rc)
CERROR("can't set maxage on #%d: %d\n", i, rc);
}
/**
* Set QoS free space priority parameter.
*
* Set the relative priority of free OST space compared to OST load when OSTs
* are space imbalanced. See lod_qos_priofree_seq_show() for description of
* this parameter. See lod_qos_thresholdrr_seq_write() and lq_threshold_rr to
* determine what constitutes "space imbalanced" OSTs.
*
* \param[in] file proc file
* \param[in] buffer string which contains the free space priority (0-100)
* \param[in] count @buffer length
* \param[in] off unused for single entry
*
* \retval @count on success
* \retval negative error code if failed
*/
static ssize_t
lod_qos_priofree_seq_write(struct file *file, const char __user *buffer,
size_t count, loff_t *off)
{
struct seq_file *m = file->private_data;
struct obd_device *dev = m->private;
struct lod_device *lod;
int val, rc;
LASSERT(dev != NULL);
lod = lu2lod_dev(dev->obd_lu_dev);
rc = lprocfs_write_helper(buffer, count, &val);
if (rc)
return rc;
if (val > 100)
return -EINVAL;
lod->lod_qos.lq_prio_free = (val << 8) / 100;
lod->lod_qos.lq_dirty = 1;
lod->lod_qos.lq_reset = 1;
return count;
}
