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authorIgor Konopko <igor.j.konopko@intel.com>2019-05-04 20:38:05 +0200
committerJens Axboe <axboe@kernel.dk>2019-05-06 10:19:18 -0600
commitf2e024570ef1a3d443875f6063321ee2e503ceb1 (patch)
tree38d0d4514b953abf1af92e4cb92acf325b0039e8 /drivers
parent32ac0fa3afebb8b83e3f9189af1a481c0110fe51 (diff)
lightnvm: pblk: GC error handling
Currently when there is an IO error (or similar) on GC read path, pblk still move the line, which was currently under GC process to free state. Such a behaviour can lead to silent data mismatch issue. With this patch, the line which was under GC process on which some IO errors occurred, will be putted back to closed state (instead of free state as it was without this patch) and the L2P mapping for such a failed sectors will not be updated. Then in case of any user IOs to such a failed sectors, pblk would be able to return at least real IO error instead of stale data as it is right now. 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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/lightnvm/pblk-core.c8
-rw-r--r--drivers/lightnvm/pblk-gc.c5
-rw-r--r--drivers/lightnvm/pblk-read.c1
-rw-r--r--drivers/lightnvm/pblk.h2
4 files changed, 12 insertions, 4 deletions
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 38e26fe23138..73be3a0311ff 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -1703,6 +1703,14 @@ static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
spin_lock(&line->lock);
WARN_ON(line->state != PBLK_LINESTATE_GC);
+ if (line->w_err_gc->has_gc_err) {
+ spin_unlock(&line->lock);
+ pblk_err(pblk, "line %d had errors during GC\n", line->id);
+ pblk_put_line_back(pblk, line);
+ line->w_err_gc->has_gc_err = 0;
+ return;
+ }
+
line->state = PBLK_LINESTATE_FREE;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
index e23b1923b773..63ee205b41c4 100644
--- a/drivers/lightnvm/pblk-gc.c
+++ b/drivers/lightnvm/pblk-gc.c
@@ -59,7 +59,7 @@ static void pblk_gc_writer_kick(struct pblk_gc *gc)
wake_up_process(gc->gc_writer_ts);
}
-static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line)
+void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct list_head *move_list;
@@ -98,8 +98,7 @@ static void pblk_gc_line_ws(struct work_struct *work)
/* Read from GC victim block */
ret = pblk_submit_read_gc(pblk, gc_rq);
if (ret) {
- pblk_err(pblk, "failed GC read in line:%d (err:%d)\n",
- line->id, ret);
+ line->w_err_gc->has_gc_err = 1;
goto out;
}
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 7b7a04a80d67..27f8a76d8bd8 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -641,7 +641,6 @@ int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
if (pblk_submit_io_sync(pblk, &rqd)) {
ret = -EIO;
- pblk_err(pblk, "GC read request failed\n");
goto err_free_bio;
}
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 90c703d3f84c..e304754aaa3c 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -437,6 +437,7 @@ struct pblk_smeta {
struct pblk_w_err_gc {
int has_write_err;
+ int has_gc_err;
__le64 *lba_list;
};
@@ -917,6 +918,7 @@ void pblk_gc_free_full_lines(struct pblk *pblk);
void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled,
int *gc_active);
int pblk_gc_sysfs_force(struct pblk *pblk, int force);
+void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line);
/*
* pblk rate limiter