Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[cascardo/linux.git] / drivers / md / dm-flakey.c

diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 29b99fb..6a2e8dd 100644 (file)
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -16,7 +16,7 @@
 #define DM_MSG_PREFIX "flakey"
 
 #define all_corrupt_bio_flags_match(bio, fc)   \
-       (((bio)->bi_rw & (fc)->corrupt_bio_flags) == (fc)->corrupt_bio_flags)
+       (((bio)->bi_opf & (fc)->corrupt_bio_flags) == (fc)->corrupt_bio_flags)
 
 /*
  * Flakey: Used for testing only, simulates intermittent,
@@ -266,9 +266,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
                data[fc->corrupt_bio_byte - 1] = fc->corrupt_bio_value;
 
                DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
-                       "(rw=%c bi_rw=%u bi_sector=%llu cur_bytes=%u)\n",
+                       "(rw=%c bi_opf=%u bi_sector=%llu cur_bytes=%u)\n",
                        bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
-                       (bio_data_dir(bio) == WRITE) ? 'w' : 'r', bio->bi_rw,
+                       (bio_data_dir(bio) == WRITE) ? 'w' : 'r', bio->bi_opf,
                        (unsigned long long)bio->bi_iter.bi_sector, bio_bytes);
        }
 }
@@ -289,10 +289,14 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
                pb->bio_submitted = true;
 
                /*
-                * Map reads as normal.
+                * Error reads if neither corrupt_bio_byte or drop_writes are set.
+                * Otherwise, flakey_end_io() will decide if the reads should be modified.
                 */
-               if (bio_data_dir(bio) == READ)
+               if (bio_data_dir(bio) == READ) {
+                       if (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags))
+                               return -EIO;
                        goto map_bio;
+               }
 
                /*
                 * Drop writes?
@@ -328,14 +332,22 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio, int error)
        struct flakey_c *fc = ti->private;
        struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
 
-       /*
-        * Corrupt successful READs while in down state.
-        * If flags were specified, only corrupt those that match.
-        */
-       if (fc->corrupt_bio_byte && !error && pb->bio_submitted &&
-           (bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&
-           all_corrupt_bio_flags_match(bio, fc))
-               corrupt_bio_data(bio, fc);
+       if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
+               if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
+                   all_corrupt_bio_flags_match(bio, fc)) {
+                       /*
+                        * Corrupt successful matching READs while in down state.
+                        */
+                       corrupt_bio_data(bio, fc);
+
+               } else if (!test_bit(DROP_WRITES, &fc->flags)) {
+                       /*
+                        * Error read during the down_interval if drop_writes
+                        * wasn't configured.
+                        */
+                       return -EIO;
+               }
+       }
 
        return error;
 }