[PATCH i-g-t 4/5] lib/igt_fs: Add helper functions to create and remove directories

[José Expósito]

On Tue, Apr 22, 2025 at 03:26:00PM +0530, Riana Tauro wrote:
> Add helper function to create directory and return fd of
> the created directory. Also add a function to remove
> directories. This will be used by configfs
> 
> Cc: Louis Chauvet <louis.chauvet at bootlin.com>
> Cc: José Expósito <jose.exposito89 at gmail.com>
> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
> ---
>  lib/igt_fs.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  lib/igt_fs.h |  2 ++
>  2 files changed, 50 insertions(+)
> 
> diff --git a/lib/igt_fs.c b/lib/igt_fs.c
> index f6a2530cd..1fa281315 100644
> --- a/lib/igt_fs.c
> +++ b/lib/igt_fs.c
> @@ -21,8 +21,10 @@
>   * IN THE SOFTWARE.
>   *
>   */
> +#include <sys/stat.h>

Nit: Missing empty line

With or without the additional line:
Reviewed-by: José Expósito <jose.exposito89 at gmail.com>
  
>  #include <errno.h>
> +#include <fcntl.h>
>  #include <stdlib.h>
>  #include <unistd.h>
>  
> @@ -94,3 +96,49 @@ ssize_t igt_writen(int fd, const char *buf, size_t len)
>  	} while (total != len);
>  	return total ?: ret;
>  }
> +
> +/**
> + * igt_fs_create_dir: creates and opens directory
> + * @fd: file descriptor of parent directory
> + * @name: name of the directory to create
> + * @mode: permissions for the directory
> + *
> + * creates a directory under parent directory and returns
> + * the fd
> + *
> + * Returns: directory fd on success, -errno otherwise
> + */
> +int igt_fs_create_dir(int fd, const char *name, mode_t mode)
> +{
> +	int ret;
> +	int dirfd;
> +
> +	ret = mkdirat(fd, name, mode);
> +	if (ret)
> +		return -errno;
> +
> +	dirfd = openat(fd, name, O_DIRECTORY);
> +	if (dirfd < 0)
> +		return -errno;
> +
> +	return dirfd;
> +}
> +
> +/**
> + * igt_fs_remove_directory: removes directory
> + * @fd: fd of parent directory
> + * @name: name of directory to remove
> + *
> + * removes directory under parent directory
> + *
> + * Returns: 0 on success, -errno otherwise
> + */
> +int igt_fs_remove_dir(int fd, const char *name)
> +{
> +	int ret = unlinkat(fd, name, AT_REMOVEDIR);
> +
> +	if (ret)
> +		return -errno;
> +
> +	return 0;
> +}
> diff --git a/lib/igt_fs.h b/lib/igt_fs.h
> index 84c3fed62..ee3e7593b 100644
> --- a/lib/igt_fs.h
> +++ b/lib/igt_fs.h
> @@ -27,6 +27,8 @@
>  
>  #include <stdio.h>
>  
> +int igt_fs_create_dir(int fd, const char *name, mode_t mode);
> +int igt_fs_remove_dir(int fd, const char *name);
>  ssize_t igt_readn(int fd, char *buf, size_t len);
>  ssize_t igt_writen(int fd, const char *buf, size_t len);
>  
> -- 
> 2.47.1
>