diff options
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index ecbdc8f9f718..10e21465d5a9 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -718,51 +718,6 @@ int bdev_write_page(struct block_device *bdev, sector_t sector, } EXPORT_SYMBOL_GPL(bdev_write_page); -/** - * bdev_direct_access() - Get the address for directly-accessibly memory - * @bdev: The device containing the memory - * @dax: control and output parameters for ->direct_access - * - * If a block device is made up of directly addressable memory, this function - * will tell the caller the PFN and the address of the memory. The address - * may be directly dereferenced within the kernel without the need to call - * ioremap(), kmap() or similar. The PFN is suitable for inserting into - * page tables. - * - * Return: negative errno if an error occurs, otherwise the number of bytes - * accessible at this address. - */ -long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax) -{ - sector_t sector = dax->sector; - long avail, size = dax->size; - const struct block_device_operations *ops = bdev->bd_disk->fops; - - /* - * The device driver is allowed to sleep, in order to make the - * memory directly accessible. - */ - might_sleep(); - - if (size < 0) - return size; - if (!blk_queue_dax(bdev_get_queue(bdev)) || !ops->direct_access) - return -EOPNOTSUPP; - if ((sector + DIV_ROUND_UP(size, 512)) > - part_nr_sects_read(bdev->bd_part)) - return -ERANGE; - sector += get_start_sect(bdev); - if (sector % (PAGE_SIZE / 512)) - return -EINVAL; - avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn, size); - if (!avail) - return -ERANGE; - if (avail > 0 && avail & ~PAGE_MASK) - return -ENXIO; - return min(avail, size); -} -EXPORT_SYMBOL_GPL(bdev_direct_access); - int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, pgoff_t *pgoff) { |