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btrfs-progs: extent-tree: Introduce functions to free chunk items 

Introduce two functions, free_chunk_item and free_system_chunk_item.
First one will free chunk item in chunk tree.
The latter one will free a system chunk in super block.

They are used for later chunk/block group free function.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2015-07-07 16:15:25 +08:00 committed by David Sterba
parent 5bdee4862d
commit 1da859012b
1 changed files with 86 additions and 0 deletions
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86
extent-tree.c
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@ -3556,6 +3556,92 @@ out:
return ret;
}
static int free_system_chunk_item(struct btrfs_super_block *super,
struct btrfs_key *key)
{
struct btrfs_disk_key *disk_key;
struct btrfs_key cpu_key;
u32 array_size = btrfs_super_sys_array_size(super);
char *ptr = (char *)super->sys_chunk_array;
int cur = 0;
int ret = -ENOENT;
while (cur < btrfs_super_sys_array_size(super)) {
struct btrfs_chunk *chunk;
u32 num_stripes;
u32 chunk_len;
disk_key = (struct btrfs_disk_key *)(ptr + cur);
btrfs_disk_key_to_cpu(&cpu_key, disk_key);
if (cpu_key.type != BTRFS_CHUNK_ITEM_KEY) {
/* just in case */
ret = -EIO;
goto out;
}
chunk = (struct btrfs_chunk *)(ptr + cur + sizeof(*disk_key));
num_stripes = btrfs_stack_chunk_num_stripes(chunk);
chunk_len = btrfs_chunk_item_size(num_stripes) +
sizeof(*disk_key);
if (key->objectid == cpu_key.objectid &&
key->offset == cpu_key.offset &&
key->type == cpu_key.type) {
memmove(ptr + cur, ptr + cur + chunk_len,
array_size - cur - chunk_len);
array_size -= chunk_len;
btrfs_set_super_sys_array_size(super, array_size);
ret = 0;
goto out;
}
cur += chunk_len;
}
out:
return ret;
}
static int free_chunk_item(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 bytenr, u64 len)
{
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_root *root = fs_info->chunk_root;
struct btrfs_chunk *chunk;
u64 chunk_type;
int ret;
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.offset = bytenr;
key.type = BTRFS_CHUNK_ITEM_KEY;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0) {
ret = -ENOENT;
goto out;
}
if (ret < 0)
goto out;
chunk = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_chunk);
chunk_type = btrfs_chunk_type(path->nodes[0], chunk);
ret = btrfs_del_item(trans, root, path);
if (ret < 0)
goto out;
if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM)
ret = free_system_chunk_item(fs_info->super_copy, &key);
out:
btrfs_free_path(path);
return ret;
}
/*
* Fixup block accounting. The initial block accounting created by
* make_block_groups isn't accuracy in this case.