[v6,12/13] btrfs: consult raid-stripe-tree when scrubbing

Commit Message

Johannes Thumshirn Feb. 15, 2023, 2:33 p.m. UTC

When scrubbing a filesystem which uses the raid-stripe-tree for logical to
physical address translation, consult the RST to perform the address
translation instead of relying on fixed block group offsets.

Reviewed-by: Josef Bacik <[e-mail]>
Signed-off-by: Johannes Thumshirn <[e-mail]>
---
 fs/btrfs/scrub.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

Patch

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 69c93ae333f6..0fe529c3f5bc 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -24,6 +24,7 @@ 
 #include "accessors.h"
 #include "file-item.h"
 #include "scrub.h"
+#include "raid-stripe-tree.h"
 
 /*
  * This is only the first step towards a full-features scrub. It reads all
@@ -2719,6 +2720,21 @@  static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map,
 	int ret;
 	u8 csum[BTRFS_CSUM_SIZE];
 	u32 blocksize;
+	struct btrfs_io_stripe stripe;
+	const bool stripe_update =
+		btrfs_need_stripe_tree_update(sctx->fs_info, map->type);
+
+	if (stripe_update) {
+		stripe.dev = src_dev;
+		ret = btrfs_get_raid_extent_offset(sctx->fs_info, logical,
+						   (u64 *)&len,
+						   map->type, mirror_num,
+						   &stripe);
+		if (ret)
+			return ret;
+
+		src_physical = stripe.physical;
+	}
 
 	if (flags & BTRFS_EXTENT_FLAG_DATA) {
 		if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
@@ -2772,8 +2788,21 @@  static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map,
 			return ret;
 		len -= l;
 		logical += l;
-		physical += l;
-		src_physical += l;
+		if (stripe_update && len) {
+
+			ret = btrfs_get_raid_extent_offset(sctx->fs_info,
+							   logical, (u64 *)&len,
+							   map->type, mirror_num,
+							   &stripe);
+			if (ret)
+				return ret;
+
+			src_physical = stripe.physical;
+			physical = stripe.physical;
+		} else {
+			physical += l;
+			src_physical += l;
+		}
 	}
 	return 0;
 }