On Wed, May 26 2010, Christoph Hellwig wrote:
> On Wed, May 26, 2010 at 01:49:50PM +0200, Jens Axboe wrote:
> > Oops yes, you need to revert the parent too. But nevermind, I think I
> > see the issue. Can you try the below (go back to -git again)?
>
> This one crashes during mount of the first XFS fs in a really strange
> way:
Clearly only half baked, weird. So from the looks of it:
> [ 44.897741] XFS mounting filesystem vdb6
> [ 45.188094] BUG: unable to handle kernel paging request at 6b6b6b6b
> [ 45.190150] IP: [<6b6b6b6b>] 0x6b6b6b6b
it still ends up calling call_rcu() which I did not intend for it to do,
I must have made a mistake. My test equipment is packed down these days,
but I'll try on my workstation and send you a better patch.
Ugh ok I see it, I had the caller_frees reverted. Try this :-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index ea8592b..e173d02 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -121,6 +121,7 @@ static void bdi_work_free(struct rcu_head *head)
static void wb_work_complete(struct bdi_work *work)
{
const enum writeback_sync_modes sync_mode = work->args.sync_mode;
+ const int caller_frees = work->args.sb_pinned;
int onstack = bdi_work_on_stack(work);
/*
@@ -131,7 +132,7 @@ static void wb_work_complete(struct bdi_work *work)
*/
if (!onstack)
bdi_work_clear(work);
- if (sync_mode == WB_SYNC_NONE || onstack)
+ if ((sync_mode == WB_SYNC_NONE && !caller_frees) || onstack)
call_rcu(&work->rcu_head, bdi_work_free);
}
@@ -206,8 +207,10 @@ static void bdi_alloc_queue_work(struct backing_dev_info *bdi,
if (work) {
bdi_work_init(work, args);
bdi_queue_work(bdi, work);
- if (wait)
+ if (wait) {
bdi_wait_on_work_clear(work);
+ kfree(work);
+ }
} else {
struct bdi_writeback *wb = &bdi->wb;
--
Jens Axboe
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