badblocks: return error if any badblock set fails

_badblocks_set() returns success if at least one badblock is set
successfully, even if others fail. This can lead to data inconsistencies
in raid, where a failed badblock set should trigger the disk to be kicked
out to prevent future reads from failed write areas.

_badblocks_set() should return error if any badblock set fails. Instead
of relying on 'rv', directly returning 'sectors' for clearer logic. If all
badblocks are successfully set, 'sectors' will be 0, otherwise it
indicates the number of badblocks that have not been set yet, thus
signaling failure.

By the way, it can also fix an issue: when a newly set unack badblock is
included in an existing ack badblock, the setting will return an error.
···
  echo "0 100" /sys/block/md0/md/dev-loop1/bad_blocks
  echo "0 100" /sys/block/md0/md/dev-loop1/unacknowledged_bad_blocks
  -bash: echo: write error: No space left on device
```
After fix, it will return success.

Fixes: aa511ff8218b ("badblocks: switch to the improved badblock handling code")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Coly Li <colyli@kernel.org>
Link: https://lore.kernel.org/r/20250227075507.151331-6-zhengqixing@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/badblocks.c b/block/badblocks.c
index 1c8b8f65f6df4686e50aa4718437dbc8c8bd8496..88f27d4f385631c36e2b76974a8fddeb9cf11d25 100644 (file)
--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -843,7 +843,6 @@ static int _badblocks_set(struct badblocks *bb, sector_t s, int sectors,
        struct badblocks_context bad;
        int prev = -1, hint = -1;
        unsigned long flags;
-       int rv = 0;
        u64 *p;
 
        if (bb->shift < 0)
@@ -873,10 +872,8 @@ re_insert:
        bad.len = sectors;
        len = 0;
 
-       if (badblocks_full(bb)) {
-               rv = 1;
+       if (badblocks_full(bb))
                goto out;
-       }
 
        if (badblocks_empty(bb)) {
                len = insert_at(bb, 0, &bad);
@@ -916,10 +913,8 @@ re_insert:
                        int extra = 0;
 
                        if (!can_front_overwrite(bb, prev, &bad, &extra)) {
-                               if (extra > 0) {
-                                       rv = 1;
+                               if (extra > 0)
                                        goto out;
-                               }
 
                                len = min_t(sector_t,
                                            BB_END(p[prev]) - s, sectors);
@@ -986,10 +981,7 @@ out:
 
        write_sequnlock_irqrestore(&bb->lock, flags);
 
-       if (!added)
-               rv = 1;
-
-       return rv;
+       return sectors;
 }
 
 /*
@@ -1353,7 +1345,8 @@ EXPORT_SYMBOL_GPL(badblocks_check);
  *
  * Return:
  *  0: success
- *  1: failed to set badblocks (out of space)
+ *  other: failed to set badblocks (out of space). Parital setting will be
+ *  treated as failure.
  */
 int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
                        int acknowledged)