From: Mingming Cao Date: Thu, 7 Dec 2006 04:38:19 +0000 (-0800) Subject: [PATCH] ext4: fix reservation extension X-Git-Tag: MMI-PSA29.97-13-9~45878^2~14^2~142 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1df1e63b9e9340015c01b85817568fb9afde10bc;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git [PATCH] ext4: fix reservation extension Hugh Dickins wrote: > Not found anything relevant, but I keep noticing these lines > in ext2_try_to_allocate_with_rsv(), ext3 and ext4 similar: > > } else if (grp_goal > 0 && > (my_rsv->rsv_end - grp_goal + 1) < *count) > try_to_extend_reservation(my_rsv, sb, > *count-my_rsv->rsv_end + grp_goal - 1); > > They're wrong, a no-op in most groups, aren't they? rsv_end is an > absolute block number, whereas grp_goal is group-relative, so the > calculation ought to bring in group_first_block? Or I'm confused. > Signed-off-by: Mingming Cao Cc: "linux-ext4@vger.kernel.org" Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 5d45582f9517..6bd0bd5bbdc8 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -1324,10 +1324,14 @@ ext4_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle, if (!goal_in_my_reservation(&my_rsv->rsv_window, grp_goal, group, sb)) grp_goal = -1; - } else if (grp_goal > 0 && - (my_rsv->rsv_end-grp_goal+1) < *count) - try_to_extend_reservation(my_rsv, sb, - *count-my_rsv->rsv_end + grp_goal - 1); + } else if (grp_goal > 0) { + int curr = my_rsv->rsv_end - + (grp_goal + group_first_block) + 1; + + if (curr < *count) + try_to_extend_reservation(my_rsv, sb, + *count - curr); + } if ((my_rsv->rsv_start > group_last_block) || (my_rsv->rsv_end < group_first_block)) {