Currently when there is an IO error (or similar) on GC read path, pblk still moves this line to free state, what leads to data mismatch issue.
This patch adds a handling for such an error - after that changes this line will be returned to closed state so it can be still in use for reading - at least we will be able to return error status to user when user tries to read such a data. Signed-off-by: Igor Konopko <[email protected]> --- drivers/lightnvm/pblk-core.c | 8 ++++++++ drivers/lightnvm/pblk-gc.c | 5 ++--- drivers/lightnvm/pblk-read.c | 1 - drivers/lightnvm/pblk.h | 2 ++ 4 files changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 4d5cd99..6817f8f 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -1786,6 +1786,14 @@ 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 e23b192..63ee205 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 54422a2..6a77c24 100644 --- a/drivers/lightnvm/pblk-read.c +++ b/drivers/lightnvm/pblk-read.c @@ -475,7 +475,6 @@ 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 5d1040a..52002f5 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -427,6 +427,7 @@ struct pblk_smeta { struct pblk_w_err_gc { int has_write_err; + int has_gc_err; __le64 *lba_list; }; @@ -909,6 +910,7 @@ 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 -- 2.9.5
