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btrfs-progs: check: introduce function to check dev used space

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Introduce function check_dev_item() to check used space with dev extent
items.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Lu Fengqi 2016-04-24 14:17:10 +08:00 committed by David Sterba
parent d93fde8234
commit f9ed952b37
1 changed files with 65 additions and 0 deletions
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65
cmds-check.c
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@ -448,6 +448,7 @@ struct root_item_info {
#define CROSSING_STRIPE_BOUNDARY (1 << 4) /* For kernel scrub workaround */
#define ITEM_SIZE_MISMATCH (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)
{
@ -9400,6 +9401,70 @@ out:
return 0;
}
/*
* Check if 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("cannot find any related dev extent for dev[%llu, %u, %llu]",
key.objectid, key.type, key.offset);
btrfs_release_path(&path);
return REFERENCER_MISSING;
}
/* 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 bytes-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)
{