On Wed, Dec 11, 2024 at 01:24:02PM +0530, Ojaswin Mujoo wrote:
> Factor our the generic code to detect the FS type out of
> platform_test_fs_fd(). This can then be used to detect different file
> systems types based on magic number.
>
> Also, add a helper to detect if the fd is from an ext4 filesystem.
>
> Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
> ---
> include/linux.h | 25 +++++++++++++++++--------
> 1 file changed, 17 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux.h b/include/linux.h
> index e9eb7bfb26a1..52c64014c57f 100644
> --- a/include/linux.h
> +++ b/include/linux.h
> @@ -43,13 +43,7 @@ static __inline__ int xfsctl(const char *path, int fd, int cmd, void *p)
> return ioctl(fd, cmd, p);
> }
>
> -/*
> - * platform_test_xfs_*() implies that xfsctl will succeed on the file;
> - * on Linux, at least, special files don't get xfs file ops,
> - * so return 0 for those
> - */
> -
> -static __inline__ int platform_test_xfs_fd(int fd)
> +static __inline__ int platform_test_fs_fd(int fd, long type)
> {
> struct statfs statfsbuf;
> struct stat statbuf;
> @@ -60,7 +54,22 @@ static __inline__ int platform_test_xfs_fd(int fd)
> return 0;
> if (!S_ISREG(statbuf.st_mode) && !S_ISDIR(statbuf.st_mode))
> return 0;
> - return (statfsbuf.f_type == 0x58465342); /* XFSB */
> + return (statfsbuf.f_type == type);
> +}
> +
> +/*
> + * platform_test_xfs_*() implies that xfsctl will succeed on the file;
> + * on Linux, at least, special files don't get xfs file ops,
> + * so return 0 for those
> + */
> +static __inline__ int platform_test_xfs_fd(int fd)
> +{
> + return platform_test_fs_fd(fd, 0x58465342); /* XFSB */
> +}
> +
> +static __inline__ int platform_test_ext4_fd(int fd)
> +{
> + return platform_test_fs_fd(fd, 0xef53); /* EXT4 magic number */
Should this be pulling EXT4_SUPER_MAGIC from linux/magic.h?
--D
> }
>
> static __inline__ int platform_test_xfs_path(const char *path)
> --
> 2.43.5
>
>
