md/raid5: write errors should be recorded as bad blocks if possible.

When a write error is detected, don't mark the device as failed
immediately but rather record the fact for handle_stripe to deal with.

Handle_stripe then attempts to record a bad block.  Only if that fails
does the device get marked as faulty.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index c5429d123636..8620cb67ae39 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -249,6 +249,7 @@ struct stripe_head_state {
 
         struct bio *return_bi;
         mdk_rdev_t *blocked_rdev;
+        int handle_bad_blocks;
 };
 
 /* Flags */
@@ -264,14 +265,15 @@ struct stripe_head_state {
 #define R5_ReWrite      9       /* have tried to over-write the readerror */
 
 #define R5_Expanded     10      /* This block now has post-expand data */
-#define R5_Wantcompute  11 /* compute_block in progress treat as
-                                    * uptodate
-                                    */
-#define R5_Wantfill     12 /* dev->toread contains a bio that needs
-                                    * filling
-                                    */
-#define R5_Wantdrain    13 /* dev->towrite needs to be drained */
-#define R5_WantFUA      14      /* Write should be FUA */
+#define R5_Wantcompute  11      /* compute_block in progress treat as
+                                 * uptodate
+                                 */
+#define R5_Wantfill     12      /* dev->toread contains a bio that needs
+                                 * filling
+                                 */
+#define R5_Wantdrain    13      /* dev->towrite needs to be drained */
+#define R5_WantFUA      14      /* Write should be FUA */
+#define R5_WriteError   15      /* got a write error - need to record it */
 /*
  * Write method
  */