2012-11-01 23:54:41

by Eric Sandeen

Subject: [PATCH] fix awful goto: in ext4_mb_new_blocks()

I think the whole function could be made prettier, but
that goto really took the cake for too-clever-by-half.

Signed-off-by: Eric Sandeen <[email protected]>
---

NB: this is just by inspection; it compiles but TBH
I have not tested the actual error case handling, so
it could probably use more careful eyeballing.
I *think* this is equivalent.

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 526e553..27f421c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4310,8 +4310,10 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
repeat:
/* allocate space in core */
*errp = ext4_mb_regular_allocator(ac);
- if (*errp)
+ if (*errp) {
+ ext4_discard_allocated_blocks(ac);
goto errout;
+ }

/* as we've just preallocated more space than
* user requested orinally, we store allocated
@@ -4333,10 +4335,10 @@ repeat:
ac->ac_b_ex.fe_len = 0;
ac->ac_status = AC_STATUS_CONTINUE;
goto repeat;
- } else if (*errp)
- errout:
+ } else if (*errp) {
ext4_discard_allocated_blocks(ac);
- else {
+ goto errout;
+ } else {
block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex);
ar->len = ac->ac_b_ex.fe_len;
}
@@ -4347,6 +4349,7 @@ repeat:
*errp = -ENOSPC;
}

+errout:
if (*errp) {
ac->ac_b_ex.fe_len = 0;
ar->len = 0;

2012-11-08 22:21:02

by Theodore Ts'o

Subject: Re: [PATCH] fix awful goto: in ext4_mb_new_blocks()

On Thu, Nov 01, 2012 at 06:54:40PM -0500, Eric Sandeen wrote:
> I think the whole function could be made prettier, but
> that goto really took the cake for too-clever-by-half.
>
> Signed-off-by: Eric Sandeen <[email protected]>

Thanks, applied.

- Ted