diff options
| author | Mingming Cao <cmm@us.ibm.com> | 2006-12-06 20:38:19 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:39 -0800 |
| commit | 1df1e63b9e9340015c01b85817568fb9afde10bc (patch) | |
| tree | 10961392c3915cfe1b8317206b3993ed0e4596a6 | |
| parent | 2bd94bd79e5bfa217714f78e5d6d7b6517ca546f (diff) | |
| download | lwn-1df1e63b9e9340015c01b85817568fb9afde10bc.tar.gz lwn-1df1e63b9e9340015c01b85817568fb9afde10bc.zip | |
[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 <cmm@us.ibm.com>
Cc: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/ext4/balloc.c | 12 |
1 files changed, 8 insertions, 4 deletions
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)) { |