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Btrfs: Use a chunk of the key flags to record the item type.

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Add (untested and simple) directory item code
Fix comp_keys to use the new key ordering
Add btrfs_insert_empty_item

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-15 12:56:47 -04:00
committed by David Woodhouse
parent a1516c8921
commit 62e2749e03
14 changed files with 435 additions and 109 deletions
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51
fs/btrfs/ctree.c
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@@ -107,14 +107,14 @@ static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
return 1;
if (k1.objectid < k2->objectid)
return -1;
if (k1.flags > k2->flags)
return 1;
if (k1.flags < k2->flags)
return -1;
if (k1.offset > k2->offset)
return 1;
if (k1.offset < k2->offset)
return -1;
if (k1.flags > k2->flags)
return 1;
if (k1.flags < k2->flags)
return -1;
return 0;
}
@@ -1122,8 +1122,8 @@ static int split_leaf(struct btrfs_root *root, struct btrfs_path *path,
* Given a key and some data, insert an item into the tree.
* This does all the path init required, making room in the tree if needed.
*/
int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
void *data, int data_size)
int btrfs_insert_empty_item(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *cpu_key, u32 data_size)
{
int ret = 0;
int slot;
@@ -1132,7 +1132,6 @@ int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
struct btrfs_buffer *leaf_buf;
u32 nritems;
unsigned int data_end;
struct btrfs_path path;
struct btrfs_disk_key disk_key;
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
@@ -1140,17 +1139,16 @@ int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
/* create a root if there isn't one */
if (!root->node)
BUG();
btrfs_init_path(&path);
ret = btrfs_search_slot(root, cpu_key, &path, data_size, 1);
ret = btrfs_search_slot(root, cpu_key, path, data_size, 1);
if (ret == 0) {
btrfs_release_path(root, &path);
btrfs_release_path(root, path);
return -EEXIST;
}
if (ret < 0)
goto out;
slot_orig = path.slots[0];
leaf_buf = path.nodes[0];
slot_orig = path->slots[0];
leaf_buf = path->nodes[0];
leaf = &leaf_buf->leaf;
nritems = btrfs_header_nritems(&leaf->header);
@@ -1160,7 +1158,7 @@ int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
sizeof(struct btrfs_item) + data_size)
BUG();
slot = path.slots[0];
slot = path->slots[0];
BUG_ON(slot < 0);
if (slot != nritems) {
int i;
@@ -1186,23 +1184,42 @@ int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
data_end, old_data - data_end);
data_end = old_data;
}
/* copy the new data in */
/* setup the item for the new data */
memcpy(&leaf->items[slot].key, &disk_key,
sizeof(struct btrfs_disk_key));
btrfs_set_item_offset(leaf->items + slot, data_end - data_size);
btrfs_set_item_size(leaf->items + slot, data_size);
memcpy(btrfs_leaf_data(leaf) + data_end - data_size, data, data_size);
btrfs_set_header_nritems(&leaf->header, nritems + 1);
ret = 0;
if (slot == 0)
ret = fixup_low_keys(root, &path, &disk_key, 1);
ret = fixup_low_keys(root, path, &disk_key, 1);
BUG_ON(list_empty(&leaf_buf->dirty));
if (btrfs_leaf_free_space(root, leaf) < 0)
BUG();
check_leaf(root, &path, 0);
check_leaf(root, path, 0);
out:
return ret;
}
/*
* Given a key and some data, insert an item into the tree.
* This does all the path init required, making room in the tree if needed.
*/
int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *cpu_key,
void *data, u32 data_size)
{
int ret = 0;
struct btrfs_path path;
u8 *ptr;
btrfs_init_path(&path);
ret = btrfs_insert_empty_item(root, &path, cpu_key, data_size);
if (!ret) {
ptr = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], u8);
memcpy(ptr, data, data_size);
}
btrfs_release_path(root, &path);
return ret;
}