On 04/06/2018 04:41 AM, Sayan Ghosh wrote:
> This introduces the different functions in order to get the grades as
> the extended attributes while pre-allocating a new file. The grades
> are stored as extended attributes while the file gets created. The
> grades can be used by different user space applications as necessary.
> The functions introduced are read_grade_xattr(), is_file_graded(),
> read_count_xattr() which aim to read the extended attribute for grade
> array and also to know whether the file is graded. The detailed
> descriptions of the functions are provided as comments in the patch.
> The patch is on top of Linux Kernel 4.7.2.
Well, it's up to Ted if he wants to merge a patch that is based on 4.7.2.
In general, patches are made to the current mainline or -next tree,
while 4.7.2 was released on 2016-Aug-20.
>
> Signed-off-by: Sayan Ghosh <sgdgp.2014@xxxxxxxxx>
> ---
> fs/ext4/ext4.h | 15 +++++++++++++++
> fs/ext4/extents.c | 35 +++++++++++++++++++++++++++++++++++
> 2 files changed, 50 insertions(+)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index b84aa1c..b9ec0ca 100755
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -136,6 +136,18 @@ enum SHIFT_DIRECTION {
> /* Use blocks from reserved pool */
> #define EXT4_MB_USE_RESERVED 0x2000
>
> +/* Structure of a grade - starting block number
> + * and length of contiguous blocks with same higher
> + * grade (inclusive of starting block)
> + * example : if blocks 2,3,4 are higher graded,
> + * then block_num = 2 and len = 3
> + * Only high grade information is stored by this struct.
> + */
Wrong multi-line format style (unless ext4 is like netdev :).
--
~Randy
