mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
synced 2026-10-30 03:27:44 -04:00
[S390] dcssblk: add >2G DCSSs support and stacked contiguous DCSSs support.
The DCSS block device driver is modified to add >2G DCSSs support and allow a DCSS block device to map to a set of contiguous DCSSs. The extmem code is also modified to use new Diagnose x'64' subcodes for >2G DCSSs. Signed-off-by: Hongjie Yang <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Hongjie Yang
Martin Schwidefsky
parent
753c4dd6a2
commit
b2300b9efe
2 changed files with 596 additions and 170 deletions
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@ -31,7 +31,6 @@
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#define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x)
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#define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x)
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static int dcssblk_open(struct inode *inode, struct file *filp);
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static int dcssblk_release(struct inode *inode, struct file *filp);
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static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
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@ -48,26 +47,6 @@ static struct block_device_operations dcssblk_devops = {
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.direct_access = dcssblk_direct_access,
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};
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static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
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static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
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static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
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static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
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static DEVICE_ATTR(save, S_IWUSR | S_IRUGO, dcssblk_save_show,
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dcssblk_save_store);
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static DEVICE_ATTR(shared, S_IWUSR | S_IRUGO, dcssblk_shared_show,
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dcssblk_shared_store);
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static struct device *dcssblk_root_dev;
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struct dcssblk_dev_info {
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struct list_head lh;
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struct device dev;
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@ -80,8 +59,42 @@ struct dcssblk_dev_info {
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unsigned char save_pending;
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unsigned char is_shared;
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struct request_queue *dcssblk_queue;
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int num_of_segments;
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struct list_head seg_list;
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};
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struct segment_info {
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struct list_head lh;
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char segment_name[BUS_ID_SIZE];
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unsigned long start;
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unsigned long end;
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int segment_type;
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};
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static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
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static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
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size_t count);
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static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
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static ssize_t dcssblk_seglist_show(struct device *dev,
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struct device_attribute *attr,
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char *buf);
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static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
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static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
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static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show,
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dcssblk_save_store);
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static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show,
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dcssblk_shared_store);
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static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL);
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static struct device *dcssblk_root_dev;
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static LIST_HEAD(dcssblk_devices);
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static struct rw_semaphore dcssblk_devices_sem;
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@ -91,8 +104,15 @@ static struct rw_semaphore dcssblk_devices_sem;
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static void
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dcssblk_release_segment(struct device *dev)
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{
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PRINT_DEBUG("segment release fn called for %s\n", dev_name(dev));
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kfree(container_of(dev, struct dcssblk_dev_info, dev));
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struct dcssblk_dev_info *dev_info;
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struct segment_info *entry, *temp;
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dev_info = container_of(dev, struct dcssblk_dev_info, dev);
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list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) {
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list_del(&entry->lh);
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kfree(entry);
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}
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kfree(dev_info);
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module_put(THIS_MODULE);
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}
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@ -142,6 +162,169 @@ dcssblk_get_device_by_name(char *name)
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return NULL;
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}
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/*
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* get the struct segment_info from seg_list
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* for the given name.
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* down_read(&dcssblk_devices_sem) must be held.
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*/
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static struct segment_info *
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dcssblk_get_segment_by_name(char *name)
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{
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struct dcssblk_dev_info *dev_info;
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struct segment_info *entry;
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list_for_each_entry(dev_info, &dcssblk_devices, lh) {
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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if (!strcmp(name, entry->segment_name))
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return entry;
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}
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}
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return NULL;
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}
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/*
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* get the highest address of the multi-segment block.
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*/
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static unsigned long
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dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info)
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{
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unsigned long highest_addr;
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struct segment_info *entry;
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highest_addr = 0;
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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if (highest_addr < entry->end)
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highest_addr = entry->end;
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}
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return highest_addr;
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}
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/*
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* get the lowest address of the multi-segment block.
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*/
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static unsigned long
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dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info)
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{
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int set_first;
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unsigned long lowest_addr;
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struct segment_info *entry;
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set_first = 0;
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lowest_addr = 0;
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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if (set_first == 0) {
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lowest_addr = entry->start;
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set_first = 1;
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} else {
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if (lowest_addr > entry->start)
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lowest_addr = entry->start;
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}
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}
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return lowest_addr;
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}
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/*
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* Check continuity of segments.
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*/
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static int
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dcssblk_is_continuous(struct dcssblk_dev_info *dev_info)
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{
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int i, j, rc;
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struct segment_info *sort_list, *entry, temp;
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if (dev_info->num_of_segments <= 1)
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return 0;
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sort_list = kzalloc(
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sizeof(struct segment_info) * dev_info->num_of_segments,
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GFP_KERNEL);
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if (sort_list == NULL)
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return -ENOMEM;
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i = 0;
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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memcpy(&sort_list[i], entry, sizeof(struct segment_info));
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i++;
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}
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/* sort segments */
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for (i = 0; i < dev_info->num_of_segments; i++)
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for (j = 0; j < dev_info->num_of_segments; j++)
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if (sort_list[j].start > sort_list[i].start) {
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memcpy(&temp, &sort_list[i],
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sizeof(struct segment_info));
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memcpy(&sort_list[i], &sort_list[j],
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sizeof(struct segment_info));
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memcpy(&sort_list[j], &temp,
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sizeof(struct segment_info));
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}
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/* check continuity */
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for (i = 0; i < dev_info->num_of_segments - 1; i++) {
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if ((sort_list[i].end + 1) != sort_list[i+1].start) {
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PRINT_ERR("Segment %s is not contiguous with "
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"segment %s\n",
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sort_list[i].segment_name,
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sort_list[i+1].segment_name);
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rc = -EINVAL;
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goto out;
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}
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/* EN and EW are allowed in a block device */
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if (sort_list[i].segment_type != sort_list[i+1].segment_type) {
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if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) ||
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(sort_list[i].segment_type == SEG_TYPE_ER) ||
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!(sort_list[i+1].segment_type &
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SEGMENT_EXCLUSIVE) ||
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(sort_list[i+1].segment_type == SEG_TYPE_ER)) {
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PRINT_ERR("Segment %s has different type from "
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"segment %s\n",
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sort_list[i].segment_name,
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sort_list[i+1].segment_name);
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rc = -EINVAL;
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goto out;
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}
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}
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}
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rc = 0;
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out:
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kfree(sort_list);
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return rc;
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}
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/*
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* Load a segment
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*/
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static int
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dcssblk_load_segment(char *name, struct segment_info **seg_info)
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{
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int rc;
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/* already loaded? */
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down_read(&dcssblk_devices_sem);
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*seg_info = dcssblk_get_segment_by_name(name);
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up_read(&dcssblk_devices_sem);
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if (*seg_info != NULL)
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return -EEXIST;
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/* get a struct segment_info */
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*seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL);
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if (*seg_info == NULL)
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return -ENOMEM;
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strcpy((*seg_info)->segment_name, name);
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/* load the segment */
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rc = segment_load(name, SEGMENT_SHARED,
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&(*seg_info)->start, &(*seg_info)->end);
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if (rc < 0) {
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segment_warning(rc, (*seg_info)->segment_name);
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kfree(*seg_info);
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} else {
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INIT_LIST_HEAD(&(*seg_info)->lh);
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(*seg_info)->segment_type = rc;
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}
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return rc;
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}
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static void dcssblk_unregister_callback(struct device *dev)
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{
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device_unregister(dev);
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@ -165,6 +348,7 @@ static ssize_t
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dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
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{
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struct dcssblk_dev_info *dev_info;
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struct segment_info *entry, *temp;
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int rc;
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if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0'))
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@ -172,46 +356,46 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
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down_write(&dcssblk_devices_sem);
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dev_info = container_of(dev, struct dcssblk_dev_info, dev);
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if (atomic_read(&dev_info->use_count)) {
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PRINT_ERR("share: segment %s is busy!\n",
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dev_info->segment_name);
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rc = -EBUSY;
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goto out;
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}
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if (inbuf[0] == '1') {
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// reload segment in shared mode
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rc = segment_modify_shared(dev_info->segment_name,
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SEGMENT_SHARED);
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if (rc < 0) {
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BUG_ON(rc == -EINVAL);
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if (rc != -EAGAIN)
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goto removeseg;
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} else {
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dev_info->is_shared = 1;
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switch (dev_info->segment_type) {
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case SEG_TYPE_SR:
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case SEG_TYPE_ER:
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case SEG_TYPE_SC:
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set_disk_ro(dev_info->gd,1);
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/* reload segments in shared mode */
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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rc = segment_modify_shared(entry->segment_name,
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SEGMENT_SHARED);
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if (rc < 0) {
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BUG_ON(rc == -EINVAL);
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if (rc != -EAGAIN)
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goto removeseg;
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}
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}
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dev_info->is_shared = 1;
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switch (dev_info->segment_type) {
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case SEG_TYPE_SR:
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case SEG_TYPE_ER:
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case SEG_TYPE_SC:
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set_disk_ro(dev_info->gd, 1);
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}
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} else if (inbuf[0] == '0') {
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// reload segment in exclusive mode
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/* reload segments in exclusive mode */
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if (dev_info->segment_type == SEG_TYPE_SC) {
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PRINT_ERR("Segment type SC (%s) cannot be loaded in "
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"non-shared mode\n", dev_info->segment_name);
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"non-shared mode\n", dev_info->segment_name);
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rc = -EINVAL;
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goto out;
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}
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rc = segment_modify_shared(dev_info->segment_name,
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SEGMENT_EXCLUSIVE);
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if (rc < 0) {
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BUG_ON(rc == -EINVAL);
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if (rc != -EAGAIN)
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goto removeseg;
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} else {
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dev_info->is_shared = 0;
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set_disk_ro(dev_info->gd, 0);
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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rc = segment_modify_shared(entry->segment_name,
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SEGMENT_EXCLUSIVE);
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if (rc < 0) {
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BUG_ON(rc == -EINVAL);
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if (rc != -EAGAIN)
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goto removeseg;
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}
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}
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dev_info->is_shared = 0;
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set_disk_ro(dev_info->gd, 0);
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} else {
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rc = -EINVAL;
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goto out;
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@ -220,8 +404,14 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
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goto out;
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removeseg:
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PRINT_ERR("Could not reload segment %s, removing it now!\n",
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dev_info->segment_name);
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PRINT_ERR("Could not reload segment(s) of the device %s, removing "
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"segment(s) now!\n",
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dev_info->segment_name);
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temp = entry;
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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if (entry != temp)
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segment_unload(entry->segment_name);
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}
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list_del(&dev_info->lh);
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del_gendisk(dev_info->gd);
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@ -254,6 +444,7 @@ static ssize_t
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dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
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{
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struct dcssblk_dev_info *dev_info;
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struct segment_info *entry;
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if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0'))
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return -EINVAL;
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@ -263,14 +454,16 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
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if (inbuf[0] == '1') {
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if (atomic_read(&dev_info->use_count) == 0) {
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// device is idle => we save immediately
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PRINT_INFO("Saving segment %s\n",
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PRINT_INFO("Saving segment(s) of the device %s\n",
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dev_info->segment_name);
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segment_save(dev_info->segment_name);
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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segment_save(entry->segment_name);
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}
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} else {
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// device is busy => we save it when it becomes
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// idle in dcssblk_release
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PRINT_INFO("Segment %s is currently busy, it will "
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"be saved when it becomes idle...\n",
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PRINT_INFO("Device %s is currently busy, segment(s) "
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"will be saved when it becomes idle...\n",
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dev_info->segment_name);
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dev_info->save_pending = 1;
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}
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@ -279,7 +472,8 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
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// device is busy & the user wants to undo his save
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// request
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dev_info->save_pending = 0;
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PRINT_INFO("Pending save for segment %s deactivated\n",
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PRINT_INFO("Pending save for segment(s) of the device "
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"%s deactivated\n",
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dev_info->segment_name);
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}
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} else {
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@ -290,67 +484,124 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
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return count;
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}
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/*
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* device attribute for showing all segments in a device
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*/
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static ssize_t
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dcssblk_seglist_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int i;
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|
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struct dcssblk_dev_info *dev_info;
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struct segment_info *entry;
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|
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down_read(&dcssblk_devices_sem);
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dev_info = container_of(dev, struct dcssblk_dev_info, dev);
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i = 0;
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buf[0] = '\0';
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list_for_each_entry(entry, &dev_info->seg_list, lh) {
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strcpy(&buf[i], entry->segment_name);
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i += strlen(entry->segment_name);
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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]);
|
||||
}
|
||||
local_buf[i] = '\0';
|
||||
if ((i == 0) || (i > 8)) {
|
||||
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;
|
||||
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;
|
||||
}
|
||||
|
||||
strcpy(dev_info->segment_name, local_buf);
|
||||
dev_set_name(&dev_info->dev, local_buf);
|
||||
/* no trailing colon at the end of the input */
|
||||
if ((i > 0) && (buf[i-1] == ':')) {
|
||||
rc = -ENAMETOOLONG;
|
||||
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;
|
||||
|
||||
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;
|
||||
|
|
@ -360,65 +611,52 @@ 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);
|
||||
if (dcssblk_get_device_by_name(local_buf)) {
|
||||
up_write(&dcssblk_devices_sem);
|
||||
if (dcssblk_get_segment_by_name(local_buf)) {
|
||||
rc = -EEXIST;
|
||||
goto unload_seg;
|
||||
goto release_gd;
|
||||
}
|
||||
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 (rc)
|
||||
goto release_gd;
|
||||
sprintf(dev_info->gd->disk_name, "dcssblk%d",
|
||||
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);
|
||||
if (rc)
|
||||
goto unregister_dev;
|
||||
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;
|
||||
|
||||
|
|
@ -434,7 +672,6 @@ 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;
|
||||
|
|
@ -445,20 +682,27 @@ unregister_dev:
|
|||
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);
|
||||
|
|
@ -473,6 +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;
|
||||
|
||||
|
|
@ -499,26 +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);
|
||||
|
||||
|
|
@ -550,6 +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;
|
||||
|
|
@ -560,9 +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);
|
||||
|
|
@ -602,7 +852,7 @@ 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",
|
||||
PRINT_WARN("rejecting write to ro device %s\n",
|
||||
dev_name(&dev_info->dev));
|
||||
goto fail;
|
||||
}
|
||||
|
|
@ -658,7 +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');
|
||||
|
|
@ -666,15 +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);
|
||||
|
|
@ -741,10 +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");
|
||||
|
|
|
|||
Loading…
Reference in a new issue