diff options
Diffstat (limited to 'drivers/s390/block/dcssblk.c')
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 541 |
1 files changed, 392 insertions, 149 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index bb52d2fbac1..a7ff167d5b8 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -31,7 +31,6 @@ #define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x) #define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x) - static int dcssblk_open(struct inode *inode, struct file *filp); static int dcssblk_release(struct inode *inode, struct file *filp); static int dcssblk_make_request(struct request_queue *q, struct bio *bio); @@ -48,6 +47,30 @@ static struct block_device_operations dcssblk_devops = { .direct_access = dcssblk_direct_access, }; +struct dcssblk_dev_info { + struct list_head lh; + struct device dev; + char segment_name[BUS_ID_SIZE]; + atomic_t use_count; + struct gendisk *gd; + unsigned long start; + unsigned long end; + int segment_type; + unsigned char save_pending; + unsigned char is_shared; + struct request_queue *dcssblk_queue; + int num_of_segments; + struct list_head seg_list; +}; + +struct segment_info { + struct list_head lh; + char segment_name[BUS_ID_SIZE]; + unsigned long start; + unsigned long end; + int segment_type; +}; + static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, @@ -58,30 +81,20 @@ static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *at static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf); +static ssize_t dcssblk_seglist_show(struct device *dev, + struct device_attribute *attr, + char *buf); static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); -static DEVICE_ATTR(save, S_IWUSR | S_IRUGO, dcssblk_save_show, +static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, dcssblk_save_store); -static DEVICE_ATTR(shared, S_IWUSR | S_IRUGO, dcssblk_shared_show, +static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, dcssblk_shared_store); +static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); static struct device *dcssblk_root_dev; -struct dcssblk_dev_info { - struct list_head lh; - struct device dev; - char segment_name[BUS_ID_SIZE]; - atomic_t use_count; - struct gendisk *gd; - unsigned long start; - unsigned long end; - int segment_type; - unsigned char save_pending; - unsigned char is_shared; - struct request_queue *dcssblk_queue; -}; - static LIST_HEAD(dcssblk_devices); static struct rw_semaphore dcssblk_devices_sem; @@ -91,8 +104,15 @@ static struct rw_semaphore dcssblk_devices_sem; static void dcssblk_release_segment(struct device *dev) { - PRINT_DEBUG("segment release fn called for %s\n", dev->bus_id); - kfree(container_of(dev, struct dcssblk_dev_info, dev)); + struct dcssblk_dev_info *dev_info; + struct segment_info *entry, *temp; + + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { + list_del(&entry->lh); + kfree(entry); + } + kfree(dev_info); module_put(THIS_MODULE); } @@ -114,7 +134,7 @@ dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) found = 0; // test if minor available list_for_each_entry(entry, &dcssblk_devices, lh) - if (minor == entry->gd->first_minor) + if (minor == MINOR(disk_devt(entry->gd))) found++; if (!found) break; // got unused minor } @@ -142,6 +162,169 @@ dcssblk_get_device_by_name(char *name) return NULL; } +/* + * get the struct segment_info from seg_list + * for the given name. + * down_read(&dcssblk_devices_sem) must be held. + */ +static struct segment_info * +dcssblk_get_segment_by_name(char *name) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + + list_for_each_entry(dev_info, &dcssblk_devices, lh) { + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (!strcmp(name, entry->segment_name)) + return entry; + } + } + return NULL; +} + +/* + * get the highest address of the multi-segment block. + */ +static unsigned long +dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) +{ + unsigned long highest_addr; + struct segment_info *entry; + + highest_addr = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (highest_addr < entry->end) + highest_addr = entry->end; + } + return highest_addr; +} + +/* + * get the lowest address of the multi-segment block. + */ +static unsigned long +dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) +{ + int set_first; + unsigned long lowest_addr; + struct segment_info *entry; + + set_first = 0; + lowest_addr = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (set_first == 0) { + lowest_addr = entry->start; + set_first = 1; + } else { + if (lowest_addr > entry->start) + lowest_addr = entry->start; + } + } + return lowest_addr; +} + +/* + * Check continuity of segments. + */ +static int +dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) +{ + int i, j, rc; + struct segment_info *sort_list, *entry, temp; + + if (dev_info->num_of_segments <= 1) + return 0; + + sort_list = kzalloc( + sizeof(struct segment_info) * dev_info->num_of_segments, + GFP_KERNEL); + if (sort_list == NULL) + return -ENOMEM; + i = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + memcpy(&sort_list[i], entry, sizeof(struct segment_info)); + i++; + } + + /* sort segments */ + for (i = 0; i < dev_info->num_of_segments; i++) + for (j = 0; j < dev_info->num_of_segments; j++) + if (sort_list[j].start > sort_list[i].start) { + memcpy(&temp, &sort_list[i], + sizeof(struct segment_info)); + memcpy(&sort_list[i], &sort_list[j], + sizeof(struct segment_info)); + memcpy(&sort_list[j], &temp, + sizeof(struct segment_info)); + } + + /* 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); + rc = -EINVAL; + goto out; + } + /* EN and EW are allowed in a block device */ + if (sort_list[i].segment_type != sort_list[i+1].segment_type) { + if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || + (sort_list[i].segment_type == SEG_TYPE_ER) || + !(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); + rc = -EINVAL; + goto out; + } + } + } + rc = 0; +out: + kfree(sort_list); + return rc; +} + +/* + * Load a segment + */ +static int +dcssblk_load_segment(char *name, struct segment_info **seg_info) +{ + int rc; + + /* already loaded? */ + down_read(&dcssblk_devices_sem); + *seg_info = dcssblk_get_segment_by_name(name); + up_read(&dcssblk_devices_sem); + if (*seg_info != NULL) + return -EEXIST; + + /* get a struct segment_info */ + *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); + if (*seg_info == NULL) + return -ENOMEM; + + strcpy((*seg_info)->segment_name, name); + + /* load the segment */ + rc = segment_load(name, SEGMENT_SHARED, + &(*seg_info)->start, &(*seg_info)->end); + if (rc < 0) { + segment_warning(rc, (*seg_info)->segment_name); + kfree(*seg_info); + } else { + INIT_LIST_HEAD(&(*seg_info)->lh); + (*seg_info)->segment_type = rc; + } + return rc; +} + static void dcssblk_unregister_callback(struct device *dev) { device_unregister(dev); @@ -165,57 +348,55 @@ static ssize_t dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) { struct dcssblk_dev_info *dev_info; + struct segment_info *entry, *temp; int rc; - if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) { - PRINT_WARN("Invalid value, must be 0 or 1\n"); + if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) return -EINVAL; - } down_write(&dcssblk_devices_sem); dev_info = container_of(dev, struct dcssblk_dev_info, dev); if (atomic_read(&dev_info->use_count)) { - PRINT_ERR("share: segment %s is busy!\n", - dev_info->segment_name); rc = -EBUSY; goto out; } if (inbuf[0] == '1') { - // reload segment in shared mode - rc = segment_modify_shared(dev_info->segment_name, - SEGMENT_SHARED); - if (rc < 0) { - BUG_ON(rc == -EINVAL); - if (rc != -EAGAIN) - goto removeseg; - } else { - dev_info->is_shared = 1; - switch (dev_info->segment_type) { - case SEG_TYPE_SR: - case SEG_TYPE_ER: - case SEG_TYPE_SC: - set_disk_ro(dev_info->gd,1); + /* reload segments in shared mode */ + list_for_each_entry(entry, &dev_info->seg_list, lh) { + rc = segment_modify_shared(entry->segment_name, + SEGMENT_SHARED); + if (rc < 0) { + BUG_ON(rc == -EINVAL); + if (rc != -EAGAIN) + goto removeseg; } } + dev_info->is_shared = 1; + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + set_disk_ro(dev_info->gd, 1); + } } else if (inbuf[0] == '0') { - // reload segment in exclusive mode + /* 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); + "non-shared mode\n", dev_info->segment_name); rc = -EINVAL; goto out; } - rc = segment_modify_shared(dev_info->segment_name, - SEGMENT_EXCLUSIVE); - if (rc < 0) { - BUG_ON(rc == -EINVAL); - if (rc != -EAGAIN) - goto removeseg; - } else { - dev_info->is_shared = 0; - set_disk_ro(dev_info->gd, 0); + list_for_each_entry(entry, &dev_info->seg_list, lh) { + rc = segment_modify_shared(entry->segment_name, + SEGMENT_EXCLUSIVE); + if (rc < 0) { + BUG_ON(rc == -EINVAL); + if (rc != -EAGAIN) + goto removeseg; + } } + dev_info->is_shared = 0; + set_disk_ro(dev_info->gd, 0); } else { - PRINT_WARN("Invalid value, must be 0 or 1\n"); rc = -EINVAL; goto out; } @@ -223,8 +404,14 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch goto out; removeseg: - PRINT_ERR("Could not reload segment %s, removing it now!\n", - dev_info->segment_name); + PRINT_ERR("Could not reload segment(s) of the device %s, removing " + "segment(s) now!\n", + dev_info->segment_name); + temp = entry; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (entry != temp) + segment_unload(entry->segment_name); + } list_del(&dev_info->lh); del_gendisk(dev_info->gd); @@ -257,25 +444,26 @@ static ssize_t dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) { struct dcssblk_dev_info *dev_info; + struct segment_info *entry; - if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) { - PRINT_WARN("Invalid value, must be 0 or 1\n"); + if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) return -EINVAL; - } dev_info = container_of(dev, struct dcssblk_dev_info, dev); down_write(&dcssblk_devices_sem); if (inbuf[0] == '1') { if (atomic_read(&dev_info->use_count) == 0) { // device is idle => we save immediately - PRINT_INFO("Saving segment %s\n", + PRINT_INFO("Saving segment(s) of the device %s\n", dev_info->segment_name); - segment_save(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("Segment %s is currently busy, it will " - "be saved when it becomes idle...\n", + PRINT_INFO("Device %s is currently busy, segment(s) " + "will be saved when it becomes idle...\n", dev_info->segment_name); dev_info->save_pending = 1; } @@ -284,12 +472,12 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char // device is busy & the user wants to undo his save // request dev_info->save_pending = 0; - PRINT_INFO("Pending save for segment %s deactivated\n", + PRINT_INFO("Pending save for segment(s) of the device " + "%s deactivated\n", dev_info->segment_name); } } else { up_write(&dcssblk_devices_sem); - PRINT_WARN("Invalid value, must be 0 or 1\n"); return -EINVAL; } up_write(&dcssblk_devices_sem); @@ -297,66 +485,123 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char } /* + * device attribute for showing all segments in a device + */ +static ssize_t +dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int i; + + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + + down_read(&dcssblk_devices_sem); + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + i = 0; + buf[0] = '\0'; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + strcpy(&buf[i], entry->segment_name); + i += strlen(entry->segment_name); + buf[i] = '\n'; + i++; + } + up_read(&dcssblk_devices_sem); + return i; +} + +/* * device attribute for adding devices */ static ssize_t dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - int rc, i; + int rc, i, j, num_of_segments; struct dcssblk_dev_info *dev_info; + struct segment_info *seg_info, *temp; char *local_buf; unsigned long seg_byte_size; dev_info = NULL; + seg_info = NULL; if (dev != dcssblk_root_dev) { rc = -EINVAL; goto out_nobuf; } + if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { + rc = -ENAMETOOLONG; + goto out_nobuf; + } + local_buf = kmalloc(count + 1, GFP_KERNEL); if (local_buf == NULL) { rc = -ENOMEM; goto out_nobuf; } + /* * parse input */ + num_of_segments = 0; for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) { - local_buf[i] = toupper(buf[i]); + for (j = i; (buf[j] != ':') && + (buf[j] != '\0') && + (buf[j] != '\n') && + j < count; j++) { + local_buf[j-i] = toupper(buf[j]); + } + local_buf[j-i] = '\0'; + if (((j - i) == 0) || ((j - i) > 8)) { + rc = -ENAMETOOLONG; + goto seg_list_del; + } + + rc = dcssblk_load_segment(local_buf, &seg_info); + if (rc < 0) + goto seg_list_del; + /* + * get a struct dcssblk_dev_info + */ + if (num_of_segments == 0) { + dev_info = kzalloc(sizeof(struct dcssblk_dev_info), + GFP_KERNEL); + if (dev_info == NULL) { + rc = -ENOMEM; + goto out; + } + strcpy(dev_info->segment_name, local_buf); + dev_info->segment_type = seg_info->segment_type; + INIT_LIST_HEAD(&dev_info->seg_list); + } + list_add_tail(&seg_info->lh, &dev_info->seg_list); + num_of_segments++; + i = j; + + if ((buf[j] == '\0') || (buf[j] == '\n')) + break; } - local_buf[i] = '\0'; - if ((i == 0) || (i > 8)) { + + /* no trailing colon at the end of the input */ + if ((i > 0) && (buf[i-1] == ':')) { rc = -ENAMETOOLONG; - goto out; - } - /* - * already loaded? - */ - down_read(&dcssblk_devices_sem); - dev_info = dcssblk_get_device_by_name(local_buf); - up_read(&dcssblk_devices_sem); - if (dev_info != NULL) { - PRINT_WARN("Segment %s already loaded!\n", local_buf); - rc = -EEXIST; - goto out; - } - /* - * get a struct dcssblk_dev_info - */ - dev_info = kzalloc(sizeof(struct dcssblk_dev_info), GFP_KERNEL); - if (dev_info == NULL) { - rc = -ENOMEM; - goto out; + goto seg_list_del; } + strlcpy(local_buf, buf, i + 1); + dev_info->num_of_segments = num_of_segments; + rc = dcssblk_is_continuous(dev_info); + if (rc < 0) + goto seg_list_del; - strcpy(dev_info->segment_name, local_buf); - strlcpy(dev_info->dev.bus_id, local_buf, BUS_ID_SIZE); + dev_info->start = dcssblk_find_lowest_addr(dev_info); + dev_info->end = dcssblk_find_highest_addr(dev_info); + + dev_set_name(&dev_info->dev, dev_info->segment_name); dev_info->dev.release = dcssblk_release_segment; INIT_LIST_HEAD(&dev_info->lh); - dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); if (dev_info->gd == NULL) { rc = -ENOMEM; - goto free_dev_info; + goto seg_list_del; } dev_info->gd->major = dcssblk_major; dev_info->gd->fops = &dcssblk_devops; @@ -366,54 +611,43 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char dev_info->gd->driverfs_dev = &dev_info->dev; blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096); - /* - * load the segment - */ - rc = segment_load(local_buf, SEGMENT_SHARED, - &dev_info->start, &dev_info->end); - if (rc < 0) { - segment_warning(rc, dev_info->segment_name); - goto dealloc_gendisk; - } + 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, size = %lu Byte, " + PRINT_INFO("Loaded segment(s) %s, size = %lu Byte, " "capacity = %lu (512 Byte) sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); - dev_info->segment_type = rc; dev_info->save_pending = 0; dev_info->is_shared = 1; dev_info->dev.parent = dcssblk_root_dev; /* - * get minor, add to list + *get minor, add to list */ down_write(&dcssblk_devices_sem); - rc = dcssblk_assign_free_minor(dev_info); - if (rc) { - up_write(&dcssblk_devices_sem); - PRINT_ERR("No free minor number available! " - "Unloading segment...\n"); - goto unload_seg; + if (dcssblk_get_segment_by_name(local_buf)) { + rc = -EEXIST; + goto release_gd; } + rc = dcssblk_assign_free_minor(dev_info); + if (rc) + goto release_gd; sprintf(dev_info->gd->disk_name, "dcssblk%d", - dev_info->gd->first_minor); + MINOR(disk_devt(dev_info->gd))); list_add_tail(&dev_info->lh, &dcssblk_devices); if (!try_module_get(THIS_MODULE)) { rc = -ENODEV; - goto list_del; + goto dev_list_del; } /* * register the device */ rc = device_register(&dev_info->dev); if (rc) { - PRINT_ERR("Segment %s could not be registered RC=%d\n", - local_buf, rc); module_put(THIS_MODULE); - goto list_del; + goto dev_list_del; } get_device(&dev_info->dev); rc = device_create_file(&dev_info->dev, &dev_attr_shared); @@ -422,6 +656,9 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char rc = device_create_file(&dev_info->dev, &dev_attr_save); if (rc) goto unregister_dev; + rc = device_create_file(&dev_info->dev, &dev_attr_seglist); + if (rc) + goto unregister_dev; add_disk(dev_info->gd); @@ -435,32 +672,37 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char set_disk_ro(dev_info->gd,0); break; } - PRINT_DEBUG("Segment %s loaded successfully\n", local_buf); up_write(&dcssblk_devices_sem); rc = count; goto out; unregister_dev: - PRINT_ERR("device_create_file() failed!\n"); list_del(&dev_info->lh); blk_cleanup_queue(dev_info->dcssblk_queue); dev_info->gd->queue = NULL; put_disk(dev_info->gd); device_unregister(&dev_info->dev); - segment_unload(dev_info->segment_name); + list_for_each_entry(seg_info, &dev_info->seg_list, lh) { + segment_unload(seg_info->segment_name); + } put_device(&dev_info->dev); up_write(&dcssblk_devices_sem); goto out; -list_del: +dev_list_del: list_del(&dev_info->lh); - up_write(&dcssblk_devices_sem); -unload_seg: - segment_unload(local_buf); -dealloc_gendisk: +release_gd: blk_cleanup_queue(dev_info->dcssblk_queue); dev_info->gd->queue = NULL; put_disk(dev_info->gd); -free_dev_info: + up_write(&dcssblk_devices_sem); +seg_list_del: + if (dev_info == NULL) + goto out; + list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { + list_del(&seg_info->lh); + segment_unload(seg_info->segment_name); + kfree(seg_info); + } kfree(dev_info); out: kfree(local_buf); @@ -475,6 +717,7 @@ static ssize_t dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dcssblk_dev_info *dev_info; + struct segment_info *entry; int rc, i; char *local_buf; @@ -501,26 +744,28 @@ dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const ch dev_info = dcssblk_get_device_by_name(local_buf); if (dev_info == NULL) { up_write(&dcssblk_devices_sem); - PRINT_WARN("Segment %s is not loaded!\n", local_buf); + PRINT_WARN("Device %s is not loaded!\n", local_buf); rc = -ENODEV; goto out_buf; } if (atomic_read(&dev_info->use_count) != 0) { up_write(&dcssblk_devices_sem); - PRINT_WARN("Segment %s is in use!\n", local_buf); + PRINT_WARN("Device %s is in use!\n", local_buf); rc = -EBUSY; goto out_buf; } - list_del(&dev_info->lh); + list_del(&dev_info->lh); del_gendisk(dev_info->gd); blk_cleanup_queue(dev_info->dcssblk_queue); dev_info->gd->queue = NULL; put_disk(dev_info->gd); device_unregister(&dev_info->dev); - segment_unload(dev_info->segment_name); - PRINT_DEBUG("Segment %s unloaded successfully\n", - dev_info->segment_name); + + /* unload all related segments */ + list_for_each_entry(entry, &dev_info->seg_list, lh) + segment_unload(entry->segment_name); + put_device(&dev_info->dev); up_write(&dcssblk_devices_sem); @@ -552,6 +797,7 @@ static int dcssblk_release(struct inode *inode, struct file *filp) { struct dcssblk_dev_info *dev_info; + struct segment_info *entry; int rc; dev_info = inode->i_bdev->bd_disk->private_data; @@ -562,9 +808,11 @@ dcssblk_release(struct inode *inode, struct file *filp) down_write(&dcssblk_devices_sem); if (atomic_dec_and_test(&dev_info->use_count) && (dev_info->save_pending)) { - PRINT_INFO("Segment %s became idle and is being saved now\n", + PRINT_INFO("Device %s became idle and is being saved now\n", dev_info->segment_name); - segment_save(dev_info->segment_name); + list_for_each_entry(entry, &dev_info->seg_list, lh) { + segment_save(entry->segment_name); + } dev_info->save_pending = 0; } up_write(&dcssblk_devices_sem); @@ -604,7 +852,8 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio) case SEG_TYPE_SC: /* cannot write to these segments */ if (bio_data_dir(bio) == WRITE) { - PRINT_WARN("rejecting write to ro segment %s\n", dev_info->dev.bus_id); + PRINT_WARN("rejecting write to ro device %s\n", + dev_name(&dev_info->dev)); goto fail; } } @@ -659,7 +908,7 @@ static void dcssblk_check_params(void) { int rc, i, j, k; - char buf[9]; + char buf[DCSSBLK_PARM_LEN + 1]; struct dcssblk_dev_info *dev_info; for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); @@ -667,15 +916,16 @@ dcssblk_check_params(void) for (j = i; (dcssblk_segments[j] != ',') && (dcssblk_segments[j] != '\0') && (dcssblk_segments[j] != '(') && - (j - i) < 8; j++) + (j < DCSSBLK_PARM_LEN); j++) { buf[j-i] = dcssblk_segments[j]; } buf[j-i] = '\0'; rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); if ((rc >= 0) && (dcssblk_segments[j] == '(')) { - for (k = 0; buf[k] != '\0'; k++) + for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) buf[k] = toupper(buf[k]); + buf[k] = '\0'; if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { down_read(&dcssblk_devices_sem); dev_info = dcssblk_get_device_by_name(buf); @@ -702,10 +952,8 @@ dcssblk_check_params(void) static void __exit dcssblk_exit(void) { - PRINT_DEBUG("DCSSBLOCK EXIT...\n"); s390_root_dev_unregister(dcssblk_root_dev); unregister_blkdev(dcssblk_major, DCSSBLK_NAME); - PRINT_DEBUG("...finished!\n"); } static int __init @@ -713,27 +961,21 @@ dcssblk_init(void) { int rc; - PRINT_DEBUG("DCSSBLOCK INIT...\n"); dcssblk_root_dev = s390_root_dev_register("dcssblk"); - if (IS_ERR(dcssblk_root_dev)) { - PRINT_ERR("device_register() failed!\n"); + if (IS_ERR(dcssblk_root_dev)) return PTR_ERR(dcssblk_root_dev); - } rc = device_create_file(dcssblk_root_dev, &dev_attr_add); if (rc) { - PRINT_ERR("device_create_file(add) failed!\n"); s390_root_dev_unregister(dcssblk_root_dev); return rc; } rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); if (rc) { - PRINT_ERR("device_create_file(remove) failed!\n"); s390_root_dev_unregister(dcssblk_root_dev); return rc; } rc = register_blkdev(0, DCSSBLK_NAME); if (rc < 0) { - PRINT_ERR("Can't get dynamic major!\n"); s390_root_dev_unregister(dcssblk_root_dev); return rc; } @@ -742,7 +984,6 @@ dcssblk_init(void) dcssblk_check_params(); - PRINT_DEBUG("...finished!\n"); return 0; } @@ -751,10 +992,12 @@ module_exit(dcssblk_exit); module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " - "comma-separated list, each name max. 8 chars.\n" - "Adding \"(local)\" to segment name equals echoing 0 to " - "/sys/devices/dcssblk/<segment name>/shared after loading " - "the segment - \n" - "e.g. segments=\"mydcss1,mydcss2,mydcss3(local)\""); + "comma-separated list, names in each set separated " + "by commas are separated by colons, each set contains " + "names of contiguous segments and each name max. 8 chars.\n" + "Adding \"(local)\" to the end of each set equals echoing 0 " + "to /sys/devices/dcssblk/<device name>/shared after loading " + "the contiguous segments - \n" + "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); MODULE_LICENSE("GPL"); |