[PATCH v2 06/13] cdev: add cdev_size() helper

[Ahmad Fatoum]

On 12/9/25 1:51 PM, Sascha Hauer wrote:
> We'll need the size of a cdev later, add a helper for retrieving the
> size.
> 
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

> ---
>  fs/devfs-core.c  | 6 ++++++
>  fs/devfs.c       | 3 +--
>  include/driver.h | 1 +
>  3 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/devfs-core.c b/fs/devfs-core.c
> index 91082265d1aaa965160de5e414364e3fb14824d1..467aa51c858a8bde6ab4e17cc4c838b989606486 100644
> --- a/fs/devfs-core.c
> +++ b/fs/devfs-core.c
> @@ -435,6 +435,12 @@ int cdev_truncate(struct cdev *cdev, size_t size)
>  	return -EPERM;
>  }
>  
> +loff_t cdev_size(struct cdev *cdev)
> +{
> +	return cdev->flags & DEVFS_IS_CHARACTER_DEV ?
> +		FILE_SIZE_STREAM : cdev->size;
> +}
> +
>  static struct cdev *cdev_alloc(const char *name)
>  {
>  	struct cdev *new;
> diff --git a/fs/devfs.c b/fs/devfs.c
> index be3272be49e66eb843823b3ff664a1565f326790..a48c6452697b47cbd3ffc6f993230e7993e565fe 100644
> --- a/fs/devfs.c
> +++ b/fs/devfs.c
> @@ -109,8 +109,7 @@ static int devfs_open(struct inode *inode, struct file *f)
>  			return -ENOENT;
>  	}
>  
> -	f->f_size = cdev->flags & DEVFS_IS_CHARACTER_DEV ?
> -			FILE_SIZE_STREAM : cdev->size;
> +	f->f_size = cdev_size(cdev);
>  	f->private_data = cdev;
>  
>  	return cdev_open(cdev, f->f_flags);
> diff --git a/include/driver.h b/include/driver.h
> index e0fddecd085c991db4f1fe34c56405d28b6f53ad..0c7a75b3d5632fdbde65ac52667e3bdee325dcf2 100644
> --- a/include/driver.h
> +++ b/include/driver.h
> @@ -526,6 +526,7 @@ int cdev_protect(struct cdev*, size_t count, loff_t offset, int prot);
>  int cdev_discard_range(struct cdev*, loff_t count, loff_t offset);
>  int cdev_memmap(struct cdev*, void **map, int flags);
>  int cdev_truncate(struct cdev*, size_t size);
> +loff_t cdev_size(struct cdev *cdev);
>  loff_t cdev_unallocated_space(struct cdev *cdev);
>  static inline bool cdev_is_partition(const struct cdev *cdev)
>  {
> 

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