forked from Minki/linux
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
#include <linux/module.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "print-tree.h"
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int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
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struct btrfs_root_item *item, struct btrfs_key *key)
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{
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struct btrfs_path path;
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struct btrfs_key search_key;
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struct btrfs_leaf *l;
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int ret;
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int slot;
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search_key.objectid = objectid;
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search_key.flags = (u32)-1;
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search_key.offset = (u32)-1;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(NULL, root, &search_key, &path, 0, 0);
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if (ret < 0)
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goto out;
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BUG_ON(ret == 0);
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l = btrfs_buffer_leaf(path.nodes[0]);
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BUG_ON(path.slots[0] == 0);
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slot = path.slots[0] - 1;
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if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
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ret = 1;
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goto out;
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}
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memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
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sizeof(*item));
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btrfs_disk_key_to_cpu(key, &l->items[slot].key);
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btrfs_release_path(root, &path);
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ret = 0;
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out:
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return ret;
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}
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int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_key *key, struct btrfs_root_item
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*item)
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{
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struct btrfs_path path;
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struct btrfs_leaf *l;
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int ret;
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int slot;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(trans, root, key, &path, 0, 1);
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if (ret < 0)
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goto out;
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BUG_ON(ret != 0);
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l = btrfs_buffer_leaf(path.nodes[0]);
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slot = path.slots[0];
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memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
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sizeof(*item));
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mark_buffer_dirty(path.nodes[0]);
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out:
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btrfs_release_path(root, &path);
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return ret;
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}
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int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_key *key, struct btrfs_root_item
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*item)
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{
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int ret;
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ret = btrfs_insert_item(trans, root, key, item, sizeof(*item));
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BUG_ON(ret);
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return ret;
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}
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int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct btrfs_key *key)
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{
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struct btrfs_path path;
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int ret;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(trans, root, key, &path, -1, 1);
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if (ret < 0)
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goto out;
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BUG_ON(ret != 0);
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ret = btrfs_del_item(trans, root, &path);
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out:
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btrfs_release_path(root, &path);
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return ret;
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}
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