Source of dm-table.c - linux-imx - PHYTEC BitBucket (Stash)

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            return false;
​
        if (!ti->type->iterate_devices ||
            ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
            return false;
    }
​
    return true;
}
​
static int device_requires_stable_pages(struct dm_target *ti,
                    struct dm_dev *dev, sector_t start,
                    sector_t len, void *data)
{
    struct request_queue *q = bdev_get_queue(dev->bdev);
​
    return q && bdi_cap_stable_pages_required(q->backing_dev_info);
}
​
/*
 * If any underlying device requires stable pages, a table must require
 * them as well.  Only targets that support iterate_devices are considered:
 * don't want error, zero, etc to require stable pages.
 */
static bool dm_table_requires_stable_pages(struct dm_table *t)
{
    struct dm_target *ti;
    unsigned i;
​
    for (i = 0; i < dm_table_get_num_targets(t); i++) {
        ti = dm_table_get_target(t, i);
​
        if (ti->type->iterate_devices &&
            ti->type->iterate_devices(ti, device_requires_stable_pages, NULL))
            return true;
    }
​
    return false;
}
​
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
                   struct queue_limits *limits)
{
    bool wc = false, fua = false;
​
    /*
     * Copy table's limits to the DM device's request_queue
     */
    q->limits = *limits;
​
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    else
        blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
​
    if (!dm_table_supports_write_same(t))
        q->limits.max_write_same_sectors = 0;
    if (!dm_table_supports_write_zeroes(t))
        q->limits.max_write_zeroes_sectors = 0;
​
    dm_table_verify_integrity(t);
​
    /*
     * Some devices don't use blk_integrity but still want stable pages
     * because they do their own checksumming.
     */
    if (dm_table_requires_stable_pages(t))
        q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
    else
        q->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES;
​
    /*
     * Determine whether or not this queue's I/O timings contribute
     * to the entropy pool, Only request-based targets use this.
     * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
     * have it set.
     */
    if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
        blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
​
    /*