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Btrfs: Create extent_buffer interface for large blocksizes

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:14:19 -04:00
parent 50b78c24d5
commit 5f39d397df
22 changed files with 2814 additions and 2108 deletions
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51
fs/btrfs/root-tree.c
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@@ -26,12 +26,13 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
{
struct btrfs_path *path;
struct btrfs_key search_key;
struct btrfs_leaf *l;
struct btrfs_key found_key;
struct extent_buffer *l;
int ret;
int slot;
search_key.objectid = objectid;
search_key.flags = (u32)-1;
search_key.type = (u8)-1;
search_key.offset = (u64)-1;
path = btrfs_alloc_path();
@@ -39,17 +40,19 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
goto out;
BUG_ON(ret == 0);
l = btrfs_buffer_leaf(path->nodes[0]);
l = path->nodes[0];
BUG_ON(path->slots[0] == 0);
slot = path->slots[0] - 1;
if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
btrfs_item_key_to_cpu(l, &found_key, slot);
if (found_key.objectid != objectid) {
ret = 1;
goto out;
}
memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
sizeof(*item));
btrfs_disk_key_to_cpu(key, &l->items[slot].key);
read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
sizeof(*item));
memcpy(key, &found_key, sizeof(found_key));
ret = 0;
out:
btrfs_release_path(root, path);
@@ -62,10 +65,10 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
*item)
{
struct btrfs_path *path;
struct btrfs_leaf *l;
struct extent_buffer *l;
int ret;
int slot;
struct btrfs_root_item *update_item;
unsigned long ptr;
path = btrfs_alloc_path();
BUG_ON(!path);
@@ -73,10 +76,10 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
if (ret < 0)
goto out;
BUG_ON(ret != 0);
l = btrfs_buffer_leaf(path->nodes[0]);
l = path->nodes[0];
slot = path->slots[0];
update_item = btrfs_item_ptr(l, slot, struct btrfs_root_item);
btrfs_memcpy(root, l, update_item, item, sizeof(*item));
ptr = btrfs_item_ptr_offset(l, slot);
write_extent_buffer(l, item, ptr, sizeof(*item));
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
@@ -103,11 +106,10 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
struct btrfs_path *path;
int ret;
u32 nritems;
struct btrfs_leaf *leaf;
struct extent_buffer *leaf;
int slot;
key.objectid = objectid;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
key.offset = 0;
path = btrfs_alloc_path();
@@ -117,19 +119,19 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
if (ret < 0)
goto err;
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
slot = path->slots[0];
if (slot >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret)
break;
leaf = btrfs_buffer_leaf(path->nodes[0]);
nritems = btrfs_header_nritems(&leaf->header);
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
slot = path->slots[0];
}
item = leaf->items + slot;
btrfs_disk_key_to_cpu(&key, &item->key);
item = btrfs_item_nr(leaf, slot);
btrfs_item_key_to_cpu(leaf, &key, slot);
if (btrfs_key_type(&key) != BTRFS_ROOT_ITEM_KEY)
goto next;
@@ -140,7 +142,7 @@ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
break;
ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item);
if (btrfs_root_refs(ri) != 0)
if (btrfs_disk_root_refs(leaf, ri) != 0)
goto next;
dead_root = btrfs_read_fs_root_no_radix(root->fs_info, &key);
@@ -170,6 +172,7 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int ret;
u32 refs;
struct btrfs_root_item *ri;
struct extent_buffer *leaf;
path = btrfs_alloc_path();
BUG_ON(!path);
@@ -177,10 +180,10 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (ret < 0)
goto out;
BUG_ON(ret != 0);
ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0], struct btrfs_root_item);
leaf = path->nodes[0];
ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item);
refs = btrfs_root_refs(ri);
refs = btrfs_disk_root_refs(leaf, ri);
BUG_ON(refs != 0);
ret = btrfs_del_item(trans, root, path);
out: