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Diffstat (limited to 'ctree.c')
-rw-r--r--ctree.c150
1 files changed, 141 insertions, 9 deletions
diff --git a/ctree.c b/ctree.c
index 295cd5e..7cb3f84 100644
--- a/ctree.c
+++ b/ctree.c
@@ -23,6 +23,7 @@
#include "internal.h"
#include "sizes.h"
#include "messages.h"
+#include "volumes.h"
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level);
@@ -134,7 +135,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, new_root_objectid);
- write_extent_buffer(cow, root->fs_info->fsid,
+ write_extent_buffer(cow, root->fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
@@ -308,7 +309,7 @@ int __btrfs_cow_block(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, root->root_key.objectid);
- write_extent_buffer(cow, root->fs_info->fsid,
+ write_extent_buffer(cow, root->fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
WARN_ON(!(buf->flags & EXTENT_BAD_TRANSID) &&
@@ -1532,7 +1533,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans,
btrfs_node_key(lower, &lower_key, 0);
c = btrfs_alloc_free_block(trans, root, root->fs_info->nodesize,
- root->root_key.objectid, &lower_key,
+ root->root_key.objectid, &lower_key,
level, root->node->start, 0);
if (IS_ERR(c))
@@ -1548,7 +1549,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans,
root_add_used(root, root->fs_info->nodesize);
- write_extent_buffer(c, root->fs_info->fsid,
+ write_extent_buffer(c, root->fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
@@ -1669,7 +1670,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_header_generation(split, trans->transid);
btrfs_set_header_backref_rev(split, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(split, root->root_key.objectid);
- write_extent_buffer(split, root->fs_info->fsid,
+ write_extent_buffer(split, root->fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(split, root->fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(split),
@@ -2231,7 +2232,7 @@ again:
}
}
}
-
+
if (split == 0)
btrfs_cpu_key_to_disk(&disk_key, ins_key);
else
@@ -2251,7 +2252,7 @@ again:
btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(right, root->root_key.objectid);
btrfs_set_header_level(right, 0);
- write_extent_buffer(right, root->fs_info->fsid,
+ write_extent_buffer(right, root->fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
@@ -2966,7 +2967,7 @@ int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
struct extent_buffer *next = NULL;
BUG_ON(path->lowest_level + 1 >= BTRFS_MAX_LEVEL);
- while(level < BTRFS_MAX_LEVEL) {
+ do {
if (!path->nodes[level])
return 1;
@@ -2986,7 +2987,7 @@ int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
if (!extent_buffer_uptodate(next))
return -EIO;
break;
- }
+ } while (level < BTRFS_MAX_LEVEL);
path->slots[level] = slot;
while(1) {
level--;
@@ -3106,3 +3107,134 @@ int btrfs_next_extent_item(struct btrfs_root *root,
return 0;
}
}
+
+/*
+ * Search uuid tree - unmounted
+ *
+ * return -ENOENT for !found, < 0 for errors, or 0 if an item was found
+ */
+static int btrfs_uuid_tree_lookup(struct btrfs_root *uuid_root, u8 *uuid,
+ u8 type, u64 subid)
+{
+ int ret;
+ struct btrfs_path *path = NULL;
+ struct extent_buffer *eb;
+ int slot;
+ u32 item_size;
+ unsigned long offset;
+ struct btrfs_key key;
+
+ if (!uuid_root) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ btrfs_uuid_to_key(uuid, &key.objectid, &key.offset);
+ key.type = type;
+ ret = btrfs_search_slot(NULL, uuid_root, &key, path, 0, 0);
+ if (ret < 0) {
+ goto out;
+ } else if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ item_size = btrfs_item_size_nr(eb, slot);
+ offset = btrfs_item_ptr_offset(eb, slot);
+ ret = -ENOENT;
+
+ if (!IS_ALIGNED(item_size, sizeof(u64))) {
+ warning("uuid item with invalid size %lu!",
+ (unsigned long)item_size);
+ goto out;
+ }
+ while (item_size) {
+ __le64 data;
+
+ read_extent_buffer(eb, &data, offset, sizeof(data));
+ if (le64_to_cpu(data) == subid) {
+ ret = 0;
+ break;
+ }
+ offset += sizeof(data);
+ item_size -= sizeof(data);
+ }
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+ u64 subvol_id_cpu)
+{
+ struct btrfs_fs_info *fs_info = trans->fs_info;
+ struct btrfs_root *uuid_root = fs_info->uuid_root;
+ int ret;
+ struct btrfs_path *path = NULL;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ int slot;
+ unsigned long offset;
+ __le64 subvol_id_le;
+
+ if (!uuid_root) {
+ warning("%s: uuid root is not initialized", __func__);
+ return -EINVAL;
+ }
+
+ ret = btrfs_uuid_tree_lookup(uuid_root, uuid, type, subvol_id_cpu);
+ if (ret != -ENOENT)
+ return ret;
+
+ key.type = type;
+ btrfs_uuid_to_key(uuid, &key.objectid, &key.offset);
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = btrfs_insert_empty_item(trans, uuid_root, path, &key,
+ sizeof(subvol_id_le));
+ if (ret >= 0) {
+ /* Add an item for the type for the first time */
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ offset = btrfs_item_ptr_offset(eb, slot);
+ } else if (ret == -EEXIST) {
+ /*
+ * An item with that type already exists.
+ * Extend the item and store the new subvol_id at the end.
+ */
+ btrfs_extend_item(uuid_root, path, sizeof(subvol_id_le));
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ offset = btrfs_item_ptr_offset(eb, slot);
+ offset += btrfs_item_size_nr(eb, slot) - sizeof(subvol_id_le);
+ } else if (ret < 0) {
+ warning(
+ "inserting uuid item failed (0x%016llx, 0x%016llx) type %u: %d",
+ (unsigned long long)key.objectid,
+ (unsigned long long)key.offset, type, ret);
+ goto out;
+ }
+
+ ret = 0;
+ subvol_id_le = cpu_to_le64(subvol_id_cpu);
+ write_extent_buffer(eb, &subvol_id_le, offset, sizeof(subvol_id_le));
+ btrfs_mark_buffer_dirty(eb);
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}