/* This is ugly... */
#define PRINTK_HEADER "dasd_devmap:"
-#define DASD_BUS_ID_SIZE 20
#define DASD_MAX_PARAMS 256
#include "dasd_int.h"
unsigned int devindex;
unsigned short features;
struct dasd_device *device;
+ struct dasd_copy_relation *copy;
};
/*
/*
* Read a device busid/devno from a string.
*/
-static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
+static int dasd_busid(char *str, int *id0, int *id1, int *devno)
{
unsigned int val;
char *tok;
return devmap;
}
-/*
- * Find devmap for device with given bus_id.
- */
static struct dasd_devmap *
-dasd_find_busid(const char *bus_id)
+dasd_find_busid_locked(const char *bus_id)
{
struct dasd_devmap *devmap, *tmp;
int hash;
- spin_lock(&dasd_devmap_lock);
devmap = ERR_PTR(-ENODEV);
hash = dasd_hash_busid(bus_id);
list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
break;
}
}
+ return devmap;
+}
+
+/*
+ * Find devmap for device with given bus_id.
+ */
+static struct dasd_devmap *
+dasd_find_busid(const char *bus_id)
+{
+ struct dasd_devmap *devmap;
+
+ spin_lock(&dasd_devmap_lock);
+ devmap = dasd_find_busid_locked(bus_id);
spin_unlock(&dasd_devmap_lock);
return devmap;
}
return device;
}
+/*
+ * allocate a PPRC data structure and call the discipline function to fill
+ */
+static int dasd_devmap_get_pprc_status(struct dasd_device *device,
+ struct dasd_pprc_data_sc4 **data)
+{
+ struct dasd_pprc_data_sc4 *temp;
+
+ if (!device->discipline || !device->discipline->pprc_status) {
+ dev_warn(&device->cdev->dev, "Unable to query copy relation status\n");
+ return -EOPNOTSUPP;
+ }
+ temp = kzalloc(sizeof(*temp), GFP_KERNEL);
+ if (!temp)
+ return -ENOMEM;
+
+ /* get PPRC information from storage */
+ if (device->discipline->pprc_status(device, temp)) {
+ dev_warn(&device->cdev->dev, "Error during copy relation status query\n");
+ kfree(temp);
+ return -EINVAL;
+ }
+ *data = temp;
+
+ return 0;
+}
+
+/*
+ * find an entry in a PPRC device_info array by a given UID
+ * depending on the primary/secondary state of the device it has to be
+ * matched with the respective fields
+ */
+static int dasd_devmap_entry_from_pprc_data(struct dasd_pprc_data_sc4 *data,
+ struct dasd_uid uid,
+ bool primary)
+{
+ int i;
+
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (primary) {
+ if (data->dev_info[i].prim_cu_ssid == uid.ssid &&
+ data->dev_info[i].primary == uid.real_unit_addr)
+ return i;
+ } else {
+ if (data->dev_info[i].sec_cu_ssid == uid.ssid &&
+ data->dev_info[i].secondary == uid.real_unit_addr)
+ return i;
+ }
+ }
+ return -1;
+}
+
+/*
+ * check the consistency of a specified copy relation by checking
+ * the following things:
+ *
+ * - is the given device part of a copy pair setup
+ * - does the state of the device match the state in the PPRC status data
+ * - does the device UID match with the UID in the PPRC status data
+ * - to prevent misrouted IO check if the given device is present in all
+ * related PPRC status data
+ */
+static int dasd_devmap_check_copy_relation(struct dasd_device *device,
+ struct dasd_copy_entry *entry,
+ struct dasd_pprc_data_sc4 *data,
+ struct dasd_copy_relation *copy)
+{
+ struct dasd_pprc_data_sc4 *tmp_dat;
+ struct dasd_device *tmp_dev;
+ struct dasd_uid uid;
+ int i, j;
+
+ if (!device->discipline || !device->discipline->get_uid ||
+ device->discipline->get_uid(device, &uid))
+ return 1;
+
+ i = dasd_devmap_entry_from_pprc_data(data, uid, entry->primary);
+ if (i < 0) {
+ dev_warn(&device->cdev->dev, "Device not part of a copy relation\n");
+ return 1;
+ }
+
+ /* double check which role the current device has */
+ if (entry->primary) {
+ if (data->dev_info[i].flags & 0x80) {
+ dev_warn(&device->cdev->dev, "Copy pair secondary is setup as primary\n");
+ return 1;
+ }
+ if (data->dev_info[i].prim_cu_ssid != uid.ssid ||
+ data->dev_info[i].primary != uid.real_unit_addr) {
+ dev_warn(&device->cdev->dev,
+ "Primary device %s does not match copy pair status primary device %04x\n",
+ dev_name(&device->cdev->dev),
+ data->dev_info[i].prim_cu_ssid |
+ data->dev_info[i].primary);
+ return 1;
+ }
+ } else {
+ if (!(data->dev_info[i].flags & 0x80)) {
+ dev_warn(&device->cdev->dev, "Copy pair primary is setup as secondary\n");
+ return 1;
+ }
+ if (data->dev_info[i].sec_cu_ssid != uid.ssid ||
+ data->dev_info[i].secondary != uid.real_unit_addr) {
+ dev_warn(&device->cdev->dev,
+ "Secondary device %s does not match copy pair status secondary device %04x\n",
+ dev_name(&device->cdev->dev),
+ data->dev_info[i].sec_cu_ssid |
+ data->dev_info[i].secondary);
+ return 1;
+ }
+ }
+
+ /*
+ * the current device has to be part of the copy relation of all
+ * entries to prevent misrouted IO to another copy pair
+ */
+ for (j = 0; j < DASD_CP_ENTRIES; j++) {
+ if (entry == ©->entry[j])
+ tmp_dev = device;
+ else
+ tmp_dev = copy->entry[j].device;
+
+ if (!tmp_dev)
+ continue;
+
+ if (dasd_devmap_get_pprc_status(tmp_dev, &tmp_dat))
+ return 1;
+
+ if (dasd_devmap_entry_from_pprc_data(tmp_dat, uid, entry->primary) < 0) {
+ dev_warn(&tmp_dev->cdev->dev,
+ "Copy pair relation does not contain device: %s\n",
+ dev_name(&device->cdev->dev));
+ kfree(tmp_dat);
+ return 1;
+ }
+ kfree(tmp_dat);
+ }
+ return 0;
+}
+
+/* delete device from copy relation entry */
+static void dasd_devmap_delete_copy_relation_device(struct dasd_device *device)
+{
+ struct dasd_copy_relation *copy;
+ int i;
+
+ if (!device->copy)
+ return;
+
+ copy = device->copy;
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].device == device)
+ copy->entry[i].device = NULL;
+ }
+ dasd_put_device(device);
+ device->copy = NULL;
+}
+
+/*
+ * read all required information for a copy relation setup and setup the device
+ * accordingly
+ */
+int dasd_devmap_set_device_copy_relation(struct ccw_device *cdev,
+ bool pprc_enabled)
+{
+ struct dasd_pprc_data_sc4 *data = NULL;
+ struct dasd_copy_entry *entry = NULL;
+ struct dasd_copy_relation *copy;
+ struct dasd_devmap *devmap;
+ struct dasd_device *device;
+ int i, rc = 0;
+
+ devmap = dasd_devmap_from_cdev(cdev);
+ if (IS_ERR(devmap))
+ return PTR_ERR(devmap);
+
+ device = devmap->device;
+ if (!device)
+ return -ENODEV;
+
+ copy = devmap->copy;
+ /* no copy pair setup for this device */
+ if (!copy)
+ goto out;
+
+ rc = dasd_devmap_get_pprc_status(device, &data);
+ if (rc)
+ return rc;
+
+ /* print error if PPRC is requested but not enabled on storage server */
+ if (!pprc_enabled) {
+ dev_err(&cdev->dev, "Copy relation not enabled on storage server\n");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (!data->dev_info[0].state) {
+ dev_warn(&device->cdev->dev, "Copy pair setup requested for device not in copy relation\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ /* find entry */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].configured &&
+ strncmp(dev_name(&cdev->dev),
+ copy->entry[i].busid, DASD_BUS_ID_SIZE) == 0) {
+ entry = ©->entry[i];
+ break;
+ }
+ }
+ if (!entry) {
+ dev_warn(&device->cdev->dev, "Copy relation entry not found\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ /* check if the copy relation is valid */
+ if (dasd_devmap_check_copy_relation(device, entry, data, copy)) {
+ dev_warn(&device->cdev->dev, "Copy relation faulty\n");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ dasd_get_device(device);
+ copy->entry[i].device = device;
+ device->copy = copy;
+out:
+ kfree(data);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(dasd_devmap_set_device_copy_relation);
+
/*
* Wait queue for dasd_delete_device waits.
*/
dev_set_drvdata(&device->cdev->dev, NULL);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+ /* Removve copy relation */
+ dasd_devmap_delete_copy_relation_device(device);
/*
* Drop ref_count by 3, one for the devmap reference, one for
* the cdev reference and one for the passed reference.
static struct kobj_attribute path_fcs_attribute =
__ATTR(fc_security, 0444, dasd_path_fcs_show, NULL);
+/*
+ * print copy relation in the form
+ * primary,secondary[1] primary,secondary[2], ...
+ */
+static ssize_t
+dasd_copy_pair_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ char prim_busid[DASD_BUS_ID_SIZE];
+ struct dasd_copy_relation *copy;
+ struct dasd_devmap *devmap;
+ int len = 0;
+ int i;
+
+ devmap = dasd_find_busid(dev_name(dev));
+ if (IS_ERR(devmap))
+ return -ENODEV;
+
+ if (!devmap->copy)
+ return -ENODEV;
+
+ copy = devmap->copy;
+ /* find primary */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].configured && copy->entry[i].primary) {
+ strscpy(prim_busid, copy->entry[i].busid,
+ DASD_BUS_ID_SIZE);
+ break;
+ }
+ }
+ if (!copy->entry[i].primary)
+ goto out;
+
+ /* print all secondary */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].configured && !copy->entry[i].primary)
+ len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid,
+ copy->entry[i].busid);
+ }
+
+ len += sysfs_emit_at(buf, len, "\n");
+out:
+ return len;
+}
+
+static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap,
+ struct dasd_copy_relation *copy,
+ char *busid, bool primary)
+{
+ int i;
+
+ /* find free entry */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ /* current bus_id already included, nothing to do */
+ if (copy->entry[i].configured &&
+ strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
+ return 0;
+
+ if (!copy->entry[i].configured)
+ break;
+ }
+ if (i == DASD_CP_ENTRIES)
+ return -EINVAL;
+
+ copy->entry[i].configured = true;
+ strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE);
+ if (primary) {
+ copy->active = ©->entry[i];
+ copy->entry[i].primary = true;
+ }
+ if (!devmap->copy)
+ devmap->copy = copy;
+
+ return 0;
+}
+
+static void dasd_devmap_del_copy_relation(struct dasd_copy_relation *copy,
+ char *busid)
+{
+ int i;
+
+ spin_lock(&dasd_devmap_lock);
+ /* find entry */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].configured &&
+ strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
+ break;
+ }
+ if (i == DASD_CP_ENTRIES || !copy->entry[i].configured) {
+ spin_unlock(&dasd_devmap_lock);
+ return;
+ }
+
+ copy->entry[i].configured = false;
+ memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE);
+ if (copy->active == ©->entry[i]) {
+ copy->active = NULL;
+ copy->entry[i].primary = false;
+ }
+ spin_unlock(&dasd_devmap_lock);
+}
+
+static int dasd_devmap_clear_copy_relation(struct device *dev)
+{
+ struct dasd_copy_relation *copy;
+ struct dasd_devmap *devmap;
+ int i, rc = 1;
+
+ devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(devmap))
+ return 1;
+
+ spin_lock(&dasd_devmap_lock);
+ if (!devmap->copy)
+ goto out;
+
+ copy = devmap->copy;
+ /* first check if all secondary devices are offline*/
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (!copy->entry[i].configured)
+ continue;
+
+ if (copy->entry[i].device == copy->active->device)
+ continue;
+
+ if (copy->entry[i].device)
+ goto out;
+ }
+ /* clear all devmap entries */
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (strlen(copy->entry[i].busid) == 0)
+ continue;
+ if (copy->entry[i].device) {
+ dasd_put_device(copy->entry[i].device);
+ copy->entry[i].device->copy = NULL;
+ copy->entry[i].device = NULL;
+ }
+ devmap = dasd_find_busid_locked(copy->entry[i].busid);
+ devmap->copy = NULL;
+ memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE);
+ }
+ kfree(copy);
+ rc = 0;
+out:
+ spin_unlock(&dasd_devmap_lock);
+ return rc;
+}
+
+/*
+ * parse BUSIDs from a copy pair
+ */
+static int dasd_devmap_parse_busid(const char *buf, char *prim_busid,
+ char *sec_busid)
+{
+ char *primary, *secondary, *tmp, *pt;
+ int id0, id1, id2;
+
+ pt = kstrdup(buf, GFP_KERNEL);
+ tmp = pt;
+ if (!tmp)
+ return -ENOMEM;
+
+ primary = strsep(&tmp, ",");
+ if (!primary) {
+ kfree(pt);
+ return -EINVAL;
+ }
+ secondary = strsep(&tmp, ",");
+ if (!secondary) {
+ kfree(pt);
+ return -EINVAL;
+ }
+ if (dasd_busid(primary, &id0, &id1, &id2)) {
+ kfree(pt);
+ return -EINVAL;
+ }
+ sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2);
+ if (dasd_busid(secondary, &id0, &id1, &id2)) {
+ kfree(pt);
+ return -EINVAL;
+ }
+ sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2);
+ kfree(pt);
+
+ return 0;
+}
+
+static ssize_t dasd_copy_pair_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct dasd_devmap *prim_devmap, *sec_devmap;
+ char prim_busid[DASD_BUS_ID_SIZE];
+ char sec_busid[DASD_BUS_ID_SIZE];
+ struct dasd_copy_relation *copy;
+ struct dasd_device *device;
+ bool pprc_enabled;
+ int rc;
+
+ if (strncmp(buf, "clear", strlen("clear")) == 0) {
+ if (dasd_devmap_clear_copy_relation(dev))
+ return -EINVAL;
+ return count;
+ }
+
+ rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid);
+ if (rc)
+ return rc;
+
+ if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 &&
+ strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0)
+ return -EINVAL;
+
+ /* allocate primary devmap if needed */
+ prim_devmap = dasd_find_busid(prim_busid);
+ if (IS_ERR(prim_devmap))
+ prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT);
+
+ /* allocate secondary devmap if needed */
+ sec_devmap = dasd_find_busid(sec_busid);
+ if (IS_ERR(sec_devmap))
+ sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT);
+
+ /* setting copy relation is only allowed for offline secondary */
+ if (sec_devmap->device)
+ return -EINVAL;
+
+ if (prim_devmap->copy) {
+ copy = prim_devmap->copy;
+ } else if (sec_devmap->copy) {
+ copy = sec_devmap->copy;
+ } else {
+ copy = kzalloc(sizeof(*copy), GFP_KERNEL);
+ if (!copy)
+ return -ENOMEM;
+ }
+ spin_lock(&dasd_devmap_lock);
+ rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true);
+ if (rc) {
+ spin_unlock(&dasd_devmap_lock);
+ return rc;
+ }
+ rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false);
+ if (rc) {
+ spin_unlock(&dasd_devmap_lock);
+ return rc;
+ }
+ spin_unlock(&dasd_devmap_lock);
+
+ /* if primary device is already online call device setup directly */
+ if (prim_devmap->device && !prim_devmap->device->copy) {
+ device = prim_devmap->device;
+ if (device->discipline->pprc_enabled) {
+ pprc_enabled = device->discipline->pprc_enabled(device);
+ rc = dasd_devmap_set_device_copy_relation(device->cdev,
+ pprc_enabled);
+ } else {
+ rc = -EOPNOTSUPP;
+ }
+ }
+ if (rc) {
+ dasd_devmap_del_copy_relation(copy, prim_busid);
+ dasd_devmap_del_copy_relation(copy, sec_busid);
+ count = rc;
+ }
+
+ return count;
+}
+static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show,
+ dasd_copy_pair_store);
+
+static ssize_t
+dasd_copy_role_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dasd_copy_relation *copy;
+ struct dasd_device *device;
+ int len, i;
+
+ device = dasd_device_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(device))
+ return -ENODEV;
+
+ if (!device->copy) {
+ len = sysfs_emit(buf, "none\n");
+ goto out;
+ }
+ copy = device->copy;
+ /* only the active device is primary */
+ if (copy->active->device == device) {
+ len = sysfs_emit(buf, "primary\n");
+ goto out;
+ }
+ for (i = 0; i < DASD_CP_ENTRIES; i++) {
+ if (copy->entry[i].device == device) {
+ len = sysfs_emit(buf, "secondary\n");
+ goto out;
+ }
+ }
+ /* not in the list, no COPY role */
+ len = sysfs_emit(buf, "none\n");
+out:
+ dasd_put_device(device);
+ return len;
+}
+static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL);
+
#define DASD_DEFINE_ATTR(_name, _func) \
static ssize_t dasd_##_name##_show(struct device *dev, \
struct device_attribute *attr, \
&dev_attr_hpf.attr,
&dev_attr_ese.attr,
&dev_attr_fc_security.attr,
+ &dev_attr_copy_pair.attr,
+ &dev_attr_copy_role.attr,
NULL,
};
projects / kernel.git / commitdiff