On 2017/9/6 5:06, Jaegeuk Kim wrote:
> This patch fixes bavail and bfree finally.
>
> long f_bfree; /* free blocks in fs */
> long f_bavail; /* free blocks avail to non-superuser */
>
> So, bfree represents all the reserved blocks, while bavail does the space only
> visible to normal user.
>
> Fix: 3e6d0b4d9c1c ("f2fs: fix incorrect f_bfree calculation in ->statfs")
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.8+
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> ---
> fs/f2fs/super.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7e29db227910..17cca4cb93af 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -955,8 +955,8 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
> buf->f_bsize = sbi->blocksize;
>
> buf->f_blocks = total_count - start_count;
> - buf->f_bfree = user_block_count - valid_user_blocks(sbi) + ovp_count;
> - buf->f_bavail = user_block_count - valid_user_blocks(sbi) -
> + buf->f_bfree = user_block_count - valid_user_blocks(sbi);
> + buf->f_bavail = user_block_count - valid_user_blocks(sbi) - ovp_count -
set_cp(user_block_count, ((get_cp(free_segment_count) + 6 -
get_cp(overprov_segment_count)) * c.blks_per_seg));
As we calculated in mkfs, we have removed ovp_count in user_block_count, so
shouldn't we add ovp_count for f_bfree here?
Thanks,
> sbi->reserved_blocks;
>
> avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
>