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btrfs-progs: check: orig: Add ability to detect bad dev extents 

Unlike lowmem mode check, we don't have good place for original mode to
check overlapping device extents.

So this patch introduces a new function, btrfs_check_dev_extents(), to
handle such extents.

Reported-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2018-10-08 13:30:37 +08:00 committed by David Sterba
parent 920d475a98
commit 6b4ee5612e
1 changed files with 102 additions and 0 deletions
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102
check/main.c
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@ -8230,6 +8230,102 @@ out:
return ret;
}
/*
* Check if all dev extents are valid (not overlapping nor beyond device
* boundary).
*
* Dev extents <-> chunk cross checking is already done in check_chunks().
*/
static int check_dev_extents(struct btrfs_fs_info *fs_info)
{
struct btrfs_path path;
struct btrfs_key key;
struct btrfs_root *dev_root = fs_info->dev_root;
int ret;
u64 prev_devid = 0;
u64 prev_dev_ext_end = 0;
btrfs_init_path(&path);
key.objectid = 1;
key.type = BTRFS_DEV_EXTENT_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0);
if (ret < 0) {
errno = -ret;
error("failed to search device tree: %m");
goto out;
}
if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
ret = btrfs_next_leaf(dev_root, &path);
if (ret < 0) {
errno = -ret;
error("failed to find next leaf: %m");
goto out;
}
if (ret > 0) {
ret = 0;
goto out;
}
}
while (1) {
struct btrfs_dev_extent *dev_ext;
struct btrfs_device *dev;
u64 devid;
u64 physical_offset;
u64 physical_len;
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
if (key.type != BTRFS_DEV_EXTENT_KEY)
break;
dev_ext = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_dev_extent);
devid = key.objectid;
physical_offset = key.offset;
physical_len = btrfs_dev_extent_length(path.nodes[0], dev_ext);
dev = btrfs_find_device(fs_info, devid, NULL, NULL);
if (!dev) {
error("failed to find device with devid %llu", devid);
ret = -EUCLEAN;
goto out;
}
if (prev_devid == devid && prev_dev_ext_end > physical_offset) {
error(
"dev extent devid %llu physical offset %llu overlap with previous dev extent end %llu",
devid, physical_offset, prev_dev_ext_end);
ret = -EUCLEAN;
goto out;
}
if (physical_offset + physical_len > dev->total_bytes) {
error(
"dev extent devid %llu physical offset %llu len %llu is beyond device boudnary %llu",
devid, physical_offset, physical_len,
dev->total_bytes);
ret = -EUCLEAN;
goto out;
}
prev_devid = devid;
prev_dev_ext_end = physical_offset + physical_len;
ret = btrfs_next_item(dev_root, &path);
if (ret < 0) {
errno = -ret;
error("failed to find next leaf: %m");
goto out;
}
if (ret > 0) {
ret = 0;
break;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int check_chunks_and_extents(struct btrfs_fs_info *fs_info)
{
struct rb_root dev_cache;
@ -8324,6 +8420,12 @@ again:
goto out;
}
ret = check_dev_extents(fs_info);
if (ret < 0) {
err = ret;
goto out;
}
ret = check_chunks(&chunk_cache, &block_group_cache,
&dev_extent_cache, NULL, NULL, NULL, 0);
if (ret) {