From: Lu Fengqi <lufq.fnst@xxxxxxxxxxxxxx>
Introduce function check_dev_item() to check used space with dev extent
items.
Signed-off-by: Lu Fengqi <lufq.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
cmds-check.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/cmds-check.c b/cmds-check.c
index 92c254f..e2d1ebf 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -328,6 +328,7 @@ struct root_item_info {
#define CROSSING_STRIPE_BOUNDARY (1 << 4) /* For kernel scrub workaround */
#define BAD_ITEM_SIZE (1 << 5) /* Bad item size */
#define UNKNOWN_TYPE (1 << 6) /* Unknown type */
+#define ACCOUNTING_MISMATCH (1 << 7) /* Used space accounting error */
static void *print_status_check(void *p)
{
@@ -9183,6 +9184,69 @@ out:
return 0;
}
+/*
+ * Check the used space is correct with the dev item
+ */
+static int check_dev_item(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot)
+{
+ struct btrfs_root *dev_root = fs_info->dev_root;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ struct btrfs_dev_extent *ptr;
+ u64 dev_id;
+ u64 used;
+ u64 total = 0;
+ int ret;
+
+ dev_item = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
+ dev_id = btrfs_device_id(eb, dev_item);
+ used = btrfs_device_bytes_used(eb, dev_item);
+
+ key.objectid = dev_id;
+ key.type = BTRFS_DEV_EXTENT_KEY;
+ key.offset = 0;
+
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0);
+ if (ret < 0) {
+ btrfs_item_key_to_cpu(eb, &key, slot);
+ error("Couldn't find any releative dev extent for dev[%llu, %u, %llu]",
+ key.objectid, key.type, key.offset);
+ btrfs_release_path(&path);
+ return -MISSING_REFERENCER;
+ }
+
+ /* Iterate dev_extents to calculate the used space of a device */
+ while (1) {
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+
+ if (key.objectid > dev_id)
+ break;
+ if (key.type != BTRFS_DEV_EXTENT_KEY || key.objectid != dev_id)
+ goto next;
+
+ ptr = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_dev_extent);
+ total += btrfs_dev_extent_length(path.nodes[0], ptr);
+next:
+ ret = btrfs_next_item(dev_root, &path);
+ if (ret)
+ break;
+ }
+ btrfs_release_path(&path);
+
+ if (used != total) {
+ btrfs_item_key_to_cpu(eb, &key, slot);
+ error("Dev extent's total-byte(%llu) is not equal to byte-used(%llu) in dev[%llu, %u, %llu]",
+ total, used, BTRFS_ROOT_TREE_OBJECTID,
+ BTRFS_DEV_EXTENT_KEY, dev_id);
+ return -ACCOUNTING_MISMATCH;
+ }
+ return 0;
+}
+
static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int overwrite)
{
--
2.8.0
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