mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "kerncompat.h"
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#include "radix-tree.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(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 = &path.nodes[0]->leaf;
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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_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, l->data + btrfs_item_offset(l->items + slot),
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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_root *root, struct btrfs_key *key,
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struct btrfs_root_item *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(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 = &path.nodes[0]->leaf;
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slot = path.slots[0];
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memcpy(l->data + btrfs_item_offset(l->items + slot), item,
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sizeof(*item));
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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_root *root, struct btrfs_key *key,
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struct btrfs_root_item *item)
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{
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int ret;
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ret = btrfs_insert_item(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_root *root, 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(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(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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