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lightnvm: pblk: fix race during put line

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In the pblk_put_line_back function, a race condition with
__pblk_map_invalidate can make a line not part of any lists.

Fix gc_list by resetting it to null fixes the above issue.

Fixes: a4bd217 ("lightnvm: physical block device (pblk) target")
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Reviewed-by: Javier González <javier@javigon.com>
Reviewed-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Igor Konopko 2019-05-04 20:37:51 +02:00 committed by Jens Axboe
parent d378561b8e
commit 4ca8852419
1 changed files with 10 additions and 6 deletions
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12
drivers/lightnvm/pblk-gc.c
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@ -64,19 +64,23 @@ static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line)
struct pblk_line_mgmt *l_mg = &pblk->l_mg; struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct list_head *move_list; struct list_head *move_list;
spin_lock(&l_mg->gc_lock);
spin_lock(&line->lock); spin_lock(&line->lock);
WARN_ON(line->state != PBLK_LINESTATE_GC); WARN_ON(line->state != PBLK_LINESTATE_GC);
line->state = PBLK_LINESTATE_CLOSED; line->state = PBLK_LINESTATE_CLOSED;
trace_pblk_line_state(pblk_disk_name(pblk), line->id, trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state); line->state);
/* We need to reset gc_group in order to ensure that
* pblk_line_gc_list will return proper move_list
* since right now current line is not on any of the
* gc lists.
*/
line->gc_group = PBLK_LINEGC_NONE;
move_list = pblk_line_gc_list(pblk, line); move_list = pblk_line_gc_list(pblk, line);
spin_unlock(&line->lock); spin_unlock(&line->lock);
if (move_list) {
spin_lock(&l_mg->gc_lock);
list_add_tail(&line->list, move_list); list_add_tail(&line->list, move_list);
spin_unlock(&l_mg->gc_lock); spin_unlock(&l_mg->gc_lock);
}
} }
static void pblk_gc_line_ws(struct work_struct *work) static void pblk_gc_line_ws(struct work_struct *work)