kfree(state);
}
-static struct parsed_partitions *check_partition(struct gendisk *hd,
- struct block_device *bdev)
+static struct parsed_partitions *check_partition(struct gendisk *hd)
{
struct parsed_partitions *state;
int i, res, err;
}
state->pp_buf[0] = '\0';
- state->bdev = bdev;
+ state->bdev = hd->part0;
disk_name(hd, 0, state->name);
snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
if (isdigit(state->name[strlen(state->name)-1]))
static void part_release(struct device *dev)
{
- blk_free_devt(dev->devt);
+ if (MAJOR(dev->devt) == BLOCK_EXT_MAJOR)
+ blk_free_ext_minor(MINOR(dev->devt));
bdput(dev_to_bdev(dev));
}
};
/*
- * Must be called either with bd_mutex held, before a disk can be opened or
+ * Must be called either with open_mutex held, before a disk can be opened or
* after all disk users are gone.
*/
static void delete_partition(struct block_device *part)
static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
/*
- * Must be called either with bd_mutex held, before a disk can be opened or
+ * Must be called either with open_mutex held, before a disk can be opened or
* after all disk users are gone.
*/
static struct block_device *add_partition(struct gendisk *disk, int partno,
const char *dname;
int err;
- /*
- * disk_max_parts() won't be zero, either GENHD_FL_EXT_DEVT is set
- * or 'minors' is passed to alloc_disk().
- */
+ lockdep_assert_held(&disk->open_mutex);
+
if (partno >= disk_max_parts(disk))
return ERR_PTR(-EINVAL);
pdev->type = &part_type;
pdev->parent = ddev;
- err = blk_alloc_devt(bdev, &devt);
- if (err)
- goto out_put;
+ /* in consecutive minor range? */
+ if (bdev->bd_partno < disk->minors) {
+ devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno);
+ } else {
+ err = blk_alloc_ext_minor();
+ if (err < 0)
+ goto out_put;
+ devt = MKDEV(BLOCK_EXT_MAJOR, err);
+ }
pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
{
struct block_device *part;
- mutex_lock(&bdev->bd_mutex);
+ mutex_lock(&bdev->bd_disk->open_mutex);
if (partition_overlaps(bdev->bd_disk, start, length, -1)) {
- mutex_unlock(&bdev->bd_mutex);
+ mutex_unlock(&bdev->bd_disk->open_mutex);
return -EBUSY;
}
part = add_partition(bdev->bd_disk, partno, start, length,
ADDPART_FLAG_NONE, NULL);
- mutex_unlock(&bdev->bd_mutex);
+ mutex_unlock(&bdev->bd_disk->open_mutex);
return PTR_ERR_OR_ZERO(part);
}
int bdev_del_partition(struct block_device *bdev, int partno)
{
- struct block_device *part;
- int ret;
+ struct block_device *part = NULL;
+ int ret = -ENXIO;
- part = bdget_disk(bdev->bd_disk, partno);
+ mutex_lock(&bdev->bd_disk->open_mutex);
+ part = xa_load(&bdev->bd_disk->part_tbl, partno);
if (!part)
- return -ENXIO;
-
- mutex_lock(&part->bd_mutex);
- mutex_lock_nested(&bdev->bd_mutex, 1);
+ goto out_unlock;
ret = -EBUSY;
if (part->bd_openers)
delete_partition(part);
ret = 0;
out_unlock:
- mutex_unlock(&bdev->bd_mutex);
- mutex_unlock(&part->bd_mutex);
- bdput(part);
+ mutex_unlock(&bdev->bd_disk->open_mutex);
return ret;
}
int bdev_resize_partition(struct block_device *bdev, int partno,
sector_t start, sector_t length)
{
- struct block_device *part;
- int ret = 0;
+ struct block_device *part = NULL;
+ int ret = -ENXIO;
- part = bdget_disk(bdev->bd_disk, partno);
+ mutex_lock(&bdev->bd_disk->open_mutex);
+ part = xa_load(&bdev->bd_disk->part_tbl, partno);
if (!part)
- return -ENXIO;
+ goto out_unlock;
- mutex_lock(&part->bd_mutex);
- mutex_lock_nested(&bdev->bd_mutex, 1);
ret = -EINVAL;
if (start != part->bd_start_sect)
goto out_unlock;
ret = 0;
out_unlock:
- mutex_unlock(&part->bd_mutex);
- mutex_unlock(&bdev->bd_mutex);
- bdput(part);
+ mutex_unlock(&bdev->bd_disk->open_mutex);
return ret;
}
struct block_device *part;
unsigned long idx;
- lockdep_assert_held(&disk->part0->bd_mutex);
+ lockdep_assert_held(&disk->open_mutex);
xa_for_each_start(&disk->part_tbl, idx, part, 1) {
if (!bdgrab(part))
}
}
-static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
+static bool blk_add_partition(struct gendisk *disk,
struct parsed_partitions *state, int p)
{
sector_t size = state->parts[p].size;
return true;
}
-int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
+static int blk_add_partitions(struct gendisk *disk)
{
struct parsed_partitions *state;
int ret = -EAGAIN, p;
if (!disk_part_scan_enabled(disk))
return 0;
- state = check_partition(disk, bdev);
+ state = check_partition(disk);
if (!state)
return 0;
if (IS_ERR(state)) {
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
for (p = 1; p < state->limit; p++)
- if (!blk_add_partition(disk, bdev, state, p))
+ if (!blk_add_partition(disk, state, p))
goto out_free_state;
ret = 0;
return ret;
}
+int bdev_disk_changed(struct gendisk *disk, bool invalidate)
+{
+ int ret = 0;
+
+ lockdep_assert_held(&disk->open_mutex);
+
+ if (!(disk->flags & GENHD_FL_UP))
+ return -ENXIO;
+
+rescan:
+ if (disk->open_partitions)
+ return -EBUSY;
+ sync_blockdev(disk->part0);
+ invalidate_bdev(disk->part0);
+ blk_drop_partitions(disk);
+
+ clear_bit(GD_NEED_PART_SCAN, &disk->state);
+
+ /*
+ * Historically we only set the capacity to zero for devices that
+ * support partitions (independ of actually having partitions created).
+ * Doing that is rather inconsistent, but changing it broke legacy
+ * udisks polling for legacy ide-cdrom devices. Use the crude check
+ * below to get the sane behavior for most device while not breaking
+ * userspace for this particular setup.
+ */
+ if (invalidate) {
+ if (disk_part_scan_enabled(disk) ||
+ !(disk->flags & GENHD_FL_REMOVABLE))
+ set_capacity(disk, 0);
+ }
+
+ if (get_capacity(disk)) {
+ ret = blk_add_partitions(disk);
+ if (ret == -EAGAIN)
+ goto rescan;
+ } else if (invalidate) {
+ /*
+ * Tell userspace that the media / partition table may have
+ * changed.
+ */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+ }
+
+ return ret;
+}
+/*
+ * Only exported for loop and dasd for historic reasons. Don't use in new
+ * code!
+ */
+EXPORT_SYMBOL_GPL(bdev_disk_changed);
+
void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
{
struct address_space *mapping = state->bdev->bd_inode->i_mapping;
projects / linux-2.6-microblaze.git / blobdiff