On Fri, 2006-08-18 at 12:39 -0500, Eric Sandeen wrote:
> Mingming Cao wrote:
>
> > Yes, this isn't being addressed in the current 2.6.18-rc4 kernel. I
> > think this is better than casting to unsigned long long:
> >
> > - if ((my_rsv->rsv_start >= group_first_block + EXT3_BLOCKS_PER_GROUP(sb))
> > + if ((my_rsv->rsv_start > group_first_block - 1 + EXT3_BLOCKS_PER_GROUP(sb))
>
> And there are a few more of these. The patch I currently have in my stack follows.
> (personally I think
> last = first + (count - 1)
> is clearer than
> last = first - 1 + count
> but that's just my opinion...)
>
> Thanks,
>
ACK.
> -Eric
>
> Signed-off-by: Eric Sandeen <[email protected]>
>
> Index: linux-2.6.17/fs/ext3/balloc.c
> ===================================================================
> --- linux-2.6.17.orig/fs/ext3/balloc.c
> +++ linux-2.6.17/fs/ext3/balloc.c
> @@ -168,7 +168,7 @@ goal_in_my_reservation(struct ext3_reser
> ext3_fsblk_t group_first_block, group_last_block;
>
> group_first_block = ext3_group_first_block_no(sb, group);
> - group_last_block = group_first_block + EXT3_BLOCKS_PER_GROUP(sb) - 1;
> + group_last_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1);
>
> if ((rsv->_rsv_start > group_last_block) ||
> (rsv->_rsv_end < group_first_block))
> @@ -897,7 +897,7 @@ static int alloc_new_reservation(struct
> spinlock_t *rsv_lock = &EXT3_SB(sb)->s_rsv_window_lock;
>
> group_first_block = ext3_group_first_block_no(sb, group);
> - group_end_block = group_first_block + EXT3_BLOCKS_PER_GROUP(sb) - 1;
> + group_end_block = group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1);
>
> if (grp_goal < 0)
> start_block = group_first_block;
> @@ -1132,7 +1132,7 @@ ext3_try_to_allocate_with_rsv(struct sup
> try_to_extend_reservation(my_rsv, sb,
> *count-my_rsv->rsv_end + grp_goal - 1);
>
> - if ((my_rsv->rsv_start >= group_first_block + EXT3_BLOCKS_PER_GROUP(sb))
> + if ((my_rsv->rsv_start > group_first_block + (EXT3_BLOCKS_PER_GROUP(sb) - 1))
> || (my_rsv->rsv_end < group_first_block))
> BUG();
> ret = ext3_try_to_allocate(sb, handle, group, bitmap_bh, grp_goal,
>
>
>
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