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-rw-r--r--block/genhd.c51
1 files changed, 36 insertions, 15 deletions
diff --git a/block/genhd.c b/block/genhd.c
index c13cc77291af..e0ce23ac2ece 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -190,7 +190,6 @@ void add_disk(struct gendisk *disk)
disk->minors, NULL, exact_match, exact_lock, disk);
register_disk(disk);
blk_register_queue(disk);
- blk_register_filter(disk);
bdi = &disk->queue->backing_dev_info;
bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor));
@@ -203,7 +202,6 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */
void unlink_gendisk(struct gendisk *disk)
{
- blk_unregister_filter(disk);
sysfs_remove_link(&disk->dev.kobj, "bdi");
bdi_unregister(&disk->queue->backing_dev_info);
blk_unregister_queue(disk);
@@ -293,27 +291,30 @@ void __init printk_all_partitions(void)
/* iterator */
static int find_start(struct device *dev, void *data)
{
- loff_t k = *(loff_t *)data;
+ loff_t *k = data;
if (dev->type != &disk_type)
return 0;
- if (!k--)
+ if (!*k)
return 1;
+ (*k)--;
return 0;
}
static void *part_start(struct seq_file *part, loff_t *pos)
{
struct device *dev;
- loff_t n = *pos;
+ loff_t k = *pos;
- if (!n)
- seq_puts(part, "major minor #blocks name\n\n");
+ if (!k)
+ part->private = (void *)1LU; /* tell show to print header */
mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, (void *)pos, find_start);
- if (dev)
+ dev = class_find_device(&block_class, NULL, &k, find_start);
+ if (dev) {
+ put_device(dev);
return dev_to_disk(dev);
+ }
return NULL;
}
@@ -330,8 +331,10 @@ static void *part_next(struct seq_file *part, void *v, loff_t *pos)
struct device *dev;
++*pos;
dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev)
+ if (dev) {
+ put_device(dev);
return dev_to_disk(dev);
+ }
return NULL;
}
@@ -346,6 +349,17 @@ static int show_partition(struct seq_file *part, void *v)
int n;
char buf[BDEVNAME_SIZE];
+ /*
+ * Print header if start told us to do. This is to preserve
+ * the original behavior of not printing header if no
+ * partition exists. This hackery will be removed later with
+ * class iteration clean up.
+ */
+ if (part->private) {
+ seq_puts(part, "major minor #blocks name\n\n");
+ part->private = NULL;
+ }
+
/* Don't show non-partitionable removeable devices or empty devices */
if (!get_capacity(sgp) ||
(sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE)))
@@ -568,11 +582,14 @@ static struct device_type disk_type = {
static void *diskstats_start(struct seq_file *part, loff_t *pos)
{
struct device *dev;
+ loff_t k = *pos;
mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, (void *)pos, find_start);
- if (dev)
+ dev = class_find_device(&block_class, NULL, &k, find_start);
+ if (dev) {
+ put_device(dev);
return dev_to_disk(dev);
+ }
return NULL;
}
@@ -583,8 +600,10 @@ static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
++*pos;
dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev)
+ if (dev) {
+ put_device(dev);
return dev_to_disk(dev);
+ }
return NULL;
}
@@ -712,10 +731,12 @@ dev_t blk_lookup_devt(const char *name, int part)
mutex_lock(&block_class_lock);
find.name = name;
find.part = part;
- dev = class_find_device(&block_class, NULL, (void *)&find, match_id);
- if (dev)
+ dev = class_find_device(&block_class, NULL, &find, match_id);
+ if (dev) {
+ put_device(dev);
devt = MKDEV(MAJOR(dev->devt),
MINOR(dev->devt) + part);
+ }
mutex_unlock(&block_class_lock);
return devt;
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