* Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer
*/
+#define KMSG_COMPONENT "dcssblk"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ctype.h>
#include <asm/io.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
-#include <asm/s390_rdev.h>
-//#define DCSSBLK_DEBUG /* Debug messages on/off */
#define DCSSBLK_NAME "dcssblk"
#define DCSSBLK_MINORS_PER_DISK 1
#define DCSSBLK_PARM_LEN 400
-
-#ifdef DCSSBLK_DEBUG
-#define PRINT_DEBUG(x...) printk(KERN_DEBUG DCSSBLK_NAME " debug: " x)
-#else
-#define PRINT_DEBUG(x...) do {} while (0)
-#endif
-#define PRINT_INFO(x...) printk(KERN_INFO DCSSBLK_NAME " info: " x)
-#define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x)
-#define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x)
+#define DCSS_BUS_ID_SIZE 20
static int dcssblk_open(struct block_device *bdev, fmode_t mode);
static int dcssblk_release(struct gendisk *disk, fmode_t mode);
struct dcssblk_dev_info {
struct list_head lh;
struct device dev;
- char segment_name[BUS_ID_SIZE];
+ char segment_name[DCSS_BUS_ID_SIZE];
atomic_t use_count;
struct gendisk *gd;
unsigned long start;
struct segment_info {
struct list_head lh;
- char segment_name[BUS_ID_SIZE];
+ char segment_name[DCSS_BUS_ID_SIZE];
unsigned long start;
unsigned long end;
int segment_type;
/* check continuity */
for (i = 0; i < dev_info->num_of_segments - 1; i++) {
if ((sort_list[i].end + 1) != sort_list[i+1].start) {
- PRINT_ERR("Segment %s is not contiguous with "
- "segment %s\n",
- sort_list[i].segment_name,
- sort_list[i+1].segment_name);
+ pr_err("Adjacent DCSSs %s and %s are not "
+ "contiguous\n", sort_list[i].segment_name,
+ sort_list[i+1].segment_name);
rc = -EINVAL;
goto out;
}
!(sort_list[i+1].segment_type &
SEGMENT_EXCLUSIVE) ||
(sort_list[i+1].segment_type == SEG_TYPE_ER)) {
- PRINT_ERR("Segment %s has different type from "
- "segment %s\n",
- sort_list[i].segment_name,
- sort_list[i+1].segment_name);
+ pr_err("DCSS %s and DCSS %s have "
+ "incompatible types\n",
+ sort_list[i].segment_name,
+ sort_list[i+1].segment_name);
rc = -EINVAL;
goto out;
}
} else if (inbuf[0] == '0') {
/* reload segments in exclusive mode */
if (dev_info->segment_type == SEG_TYPE_SC) {
- PRINT_ERR("Segment type SC (%s) cannot be loaded in "
- "non-shared mode\n", dev_info->segment_name);
+ pr_err("DCSS %s is of type SC and cannot be "
+ "loaded as exclusive-writable\n",
+ dev_info->segment_name);
rc = -EINVAL;
goto out;
}
goto out;
removeseg:
- PRINT_ERR("Could not reload segment(s) of the device %s, removing "
- "segment(s) now!\n",
- dev_info->segment_name);
+ pr_err("DCSS device %s is removed after a failed access mode "
+ "change\n", dev_info->segment_name);
temp = entry;
list_for_each_entry(entry, &dev_info->seg_list, lh) {
if (entry != temp)
if (inbuf[0] == '1') {
if (atomic_read(&dev_info->use_count) == 0) {
// device is idle => we save immediately
- PRINT_INFO("Saving segment(s) of the device %s\n",
- dev_info->segment_name);
+ pr_info("All DCSSs that map to device %s are "
+ "saved\n", dev_info->segment_name);
list_for_each_entry(entry, &dev_info->seg_list, lh) {
segment_save(entry->segment_name);
}
} else {
// device is busy => we save it when it becomes
// idle in dcssblk_release
- PRINT_INFO("Device %s is currently busy, segment(s) "
- "will be saved when it becomes idle...\n",
- dev_info->segment_name);
+ pr_info("Device %s is in use, its DCSSs will be "
+ "saved when it becomes idle\n",
+ dev_info->segment_name);
dev_info->save_pending = 1;
}
} else if (inbuf[0] == '0') {
// device is busy & the user wants to undo his save
// request
dev_info->save_pending = 0;
- PRINT_INFO("Pending save for segment(s) of the device "
- "%s deactivated\n",
- dev_info->segment_name);
+ pr_info("A pending save request for device %s "
+ "has been canceled\n",
+ dev_info->segment_name);
}
} else {
up_write(&dcssblk_devices_sem);
seg_byte_size = (dev_info->end - dev_info->start + 1);
set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors
- PRINT_INFO("Loaded segment(s) %s, size = %lu Byte, "
- "capacity = %lu (512 Byte) sectors\n", local_buf,
- seg_byte_size, seg_byte_size >> 9);
+ pr_info("Loaded %s with total size %lu bytes and capacity %lu "
+ "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9);
dev_info->save_pending = 0;
dev_info->is_shared = 1;
dev_info = dcssblk_get_device_by_name(local_buf);
if (dev_info == NULL) {
up_write(&dcssblk_devices_sem);
- PRINT_WARN("Device %s is not loaded!\n", local_buf);
+ pr_warning("Device %s cannot be removed because it is not a "
+ "known device\n", local_buf);
rc = -ENODEV;
goto out_buf;
}
if (atomic_read(&dev_info->use_count) != 0) {
up_write(&dcssblk_devices_sem);
- PRINT_WARN("Device %s is in use!\n", local_buf);
+ pr_warning("Device %s cannot be removed while it is in "
+ "use\n", local_buf);
rc = -EBUSY;
goto out_buf;
}
down_write(&dcssblk_devices_sem);
if (atomic_dec_and_test(&dev_info->use_count)
&& (dev_info->save_pending)) {
- PRINT_INFO("Device %s became idle and is being saved now\n",
- dev_info->segment_name);
+ pr_info("Device %s has become idle and is being saved "
+ "now\n", dev_info->segment_name);
list_for_each_entry(entry, &dev_info->seg_list, lh) {
segment_save(entry->segment_name);
}
case SEG_TYPE_SC:
/* cannot write to these segments */
if (bio_data_dir(bio) == WRITE) {
- PRINT_WARN("rejecting write to ro device %s\n",
+ pr_warning("Writing to %s failed because it "
+ "is a read-only device\n",
dev_name(&dev_info->dev));
goto fail;
}
static void __exit
dcssblk_exit(void)
{
- s390_root_dev_unregister(dcssblk_root_dev);
+ root_device_unregister(dcssblk_root_dev);
unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
}
{
int rc;
- dcssblk_root_dev = s390_root_dev_register("dcssblk");
+ dcssblk_root_dev = root_device_register("dcssblk");
if (IS_ERR(dcssblk_root_dev))
return PTR_ERR(dcssblk_root_dev);
rc = device_create_file(dcssblk_root_dev, &dev_attr_add);
if (rc) {
- s390_root_dev_unregister(dcssblk_root_dev);
+ root_device_unregister(dcssblk_root_dev);
return rc;
}
rc = device_create_file(dcssblk_root_dev, &dev_attr_remove);
if (rc) {
- s390_root_dev_unregister(dcssblk_root_dev);
+ root_device_unregister(dcssblk_root_dev);
return rc;
}
rc = register_blkdev(0, DCSSBLK_NAME);
if (rc < 0) {
- s390_root_dev_unregister(dcssblk_root_dev);
+ root_device_unregister(dcssblk_root_dev);
return rc;
}
dcssblk_major = rc;
projects / linux-2.6-omap-h63xx.git / blobdiff