btrfs-progs/extent-tree.c

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#include <stdio.h>
#include <stdlib.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
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static int find_free_extent(struct btrfs_root *orig_root, u64 num_blocks,
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u64 search_start, u64 search_end,
struct btrfs_key *ins);
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static int finish_current_insert(struct btrfs_root *extent_root);
static int run_pending(struct btrfs_root *extent_root);
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/*
* pending extents are blocks that we're trying to allocate in the extent
* map while trying to grow the map because of other allocations. To avoid
* recursing, they are tagged in the radix tree and cleaned up after
* other allocations are done. The pending tag is also used in the same
* manner for deletes.
*/
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#define CTREE_EXTENT_PENDING_DEL 0
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static int inc_block_ref(struct btrfs_root *root, u64 blocknr)
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{
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struct btrfs_path path;
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int ret;
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struct btrfs_key key;
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struct btrfs_leaf *l;
struct btrfs_extent_item *item;
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struct btrfs_key ins;
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u32 refs;
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find_free_extent(root->extent_root, 0, 0, (u64)-1, &ins);
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btrfs_init_path(&path);
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key.objectid = blocknr;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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key.offset = 1;
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ret = btrfs_search_slot(root->extent_root, &key, &path, 0, 1);
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if (ret != 0)
BUG();
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BUG_ON(ret != 0);
l = &path.nodes[0]->leaf;
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item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
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refs = btrfs_extent_refs(item);
btrfs_set_extent_refs(item, refs + 1);
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BUG_ON(list_empty(&path.nodes[0]->dirty));
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btrfs_release_path(root->extent_root, &path);
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finish_current_insert(root->extent_root);
run_pending(root->extent_root);
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return 0;
}
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static int lookup_block_ref(struct btrfs_root *root, u64 blocknr, u32 *refs)
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{
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struct btrfs_path path;
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int ret;
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struct btrfs_key key;
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struct btrfs_leaf *l;
struct btrfs_extent_item *item;
btrfs_init_path(&path);
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key.objectid = blocknr;
key.offset = 1;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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ret = btrfs_search_slot(root->extent_root, &key, &path, 0, 0);
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if (ret != 0)
BUG();
l = &path.nodes[0]->leaf;
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item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
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*refs = btrfs_extent_refs(item);
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btrfs_release_path(root->extent_root, &path);
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return 0;
}
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int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf)
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{
u64 blocknr;
int i;
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if (!root->ref_cows)
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return 0;
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if (btrfs_is_leaf(&buf->node))
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return 0;
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for (i = 0; i < btrfs_header_nritems(&buf->node.header); i++) {
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blocknr = btrfs_node_blockptr(&buf->node, i);
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inc_block_ref(root, blocknr);
}
return 0;
}
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int btrfs_finish_extent_commit(struct btrfs_root *root)
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{
unsigned long gang[8];
int ret;
int i;
while(1) {
ret = radix_tree_gang_lookup(&root->pinned_radix,
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(void **)gang, 0,
ARRAY_SIZE(gang));
if (!ret)
break;
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for (i = 0; i < ret; i++) {
radix_tree_delete(&root->pinned_radix, gang[i]);
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}
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}
root->last_insert.objectid = 0;
root->last_insert.offset = 0;
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return 0;
}
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static int finish_current_insert(struct btrfs_root *extent_root)
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{
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struct btrfs_key ins;
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struct btrfs_extent_item extent_item;
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int i;
int ret;
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btrfs_set_extent_refs(&extent_item, 1);
btrfs_set_extent_owner(&extent_item,
btrfs_header_parentid(&extent_root->node->node.header));
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ins.offset = 1;
ins.flags = 0;
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
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for (i = 0; i < extent_root->current_insert.flags; i++) {
ins.objectid = extent_root->current_insert.objectid + i;
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ret = btrfs_insert_item(extent_root, &ins, &extent_item,
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sizeof(extent_item));
BUG_ON(ret);
}
extent_root->current_insert.offset = 0;
return 0;
}
/*
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* remove an extent from the root, returns 0 on success
*/
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static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
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{
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struct btrfs_path path;
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struct btrfs_key key;
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struct btrfs_root *extent_root = root->extent_root;
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int ret;
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struct btrfs_extent_item *ei;
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struct btrfs_key ins;
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u32 refs;
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key.objectid = blocknr;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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key.offset = num_blocks;
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find_free_extent(root, 0, 0, (u64)-1, &ins);
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btrfs_init_path(&path);
ret = btrfs_search_slot(extent_root, &key, &path, -1, 1);
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if (ret) {
printf("failed to find %Lu\n", key.objectid);
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btrfs_print_tree(extent_root, extent_root->node);
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printf("failed to find %Lu\n", key.objectid);
BUG();
}
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ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
struct btrfs_extent_item);
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BUG_ON(ei->refs == 0);
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refs = btrfs_extent_refs(ei) - 1;
btrfs_set_extent_refs(ei, refs);
if (refs == 0) {
if (!root->ref_cows) {
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int err;
radix_tree_preload(GFP_KERNEL);
err = radix_tree_insert(&extent_root->pinned_radix,
blocknr, (void *)blocknr);
BUG_ON(err);
radix_tree_preload_end();
}
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ret = btrfs_del_item(extent_root, &path);
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if (root != extent_root &&
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extent_root->last_insert.objectid > blocknr)
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extent_root->last_insert.objectid = blocknr;
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if (ret)
BUG();
}
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btrfs_release_path(extent_root, &path);
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finish_current_insert(extent_root);
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return ret;
}
/*
* find all the blocks marked as pending in the radix tree and remove
* them from the extent map
*/
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static int del_pending_extents(struct btrfs_root *extent_root)
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{
int ret;
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struct btrfs_buffer *gang[4];
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int i;
while(1) {
ret = radix_tree_gang_lookup_tag(&extent_root->cache_radix,
(void **)gang, 0,
ARRAY_SIZE(gang),
CTREE_EXTENT_PENDING_DEL);
if (!ret)
break;
for (i = 0; i < ret; i++) {
ret = __free_extent(extent_root, gang[i]->blocknr, 1);
radix_tree_tag_clear(&extent_root->cache_radix,
gang[i]->blocknr,
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CTREE_EXTENT_PENDING_DEL);
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btrfs_block_release(extent_root, gang[i]);
}
}
return 0;
}
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static int run_pending(struct btrfs_root *extent_root)
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{
while(radix_tree_tagged(&extent_root->cache_radix,
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CTREE_EXTENT_PENDING_DEL))
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del_pending_extents(extent_root);
return 0;
}
/*
* remove an extent from the root, returns 0 on success
*/
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int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
{
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struct btrfs_root *extent_root = root->extent_root;
struct btrfs_buffer *t;
int pending_ret;
int ret;
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if (root == extent_root) {
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t = find_tree_block(root, blocknr);
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radix_tree_tag_set(&root->cache_radix, blocknr,
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CTREE_EXTENT_PENDING_DEL);
return 0;
}
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ret = __free_extent(root, blocknr, num_blocks);
pending_ret = run_pending(root->extent_root);
return ret ? ret : pending_ret;
}
/*
* walks the btree of allocated extents and find a hole of a given size.
* The key ins is changed to record the hole:
* ins->objectid == block start
* ins->flags = BTRFS_EXTENT_ITEM_KEY
* ins->offset == number of blocks
* Any available blocks before search_start are skipped.
*/
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static int find_free_extent(struct btrfs_root *orig_root, u64 num_blocks,
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u64 search_start, u64 search_end,
struct btrfs_key *ins)
{
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struct btrfs_path path;
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struct btrfs_key key;
int ret;
u64 hole_size = 0;
int slot = 0;
u64 last_block;
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u64 test_block;
int start_found;
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struct btrfs_leaf *l;
struct btrfs_root * root = orig_root->extent_root;
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int total_needed = num_blocks;
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total_needed += (btrfs_header_level(&root->node->node.header) + 1) * 3;
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if (root->last_insert.objectid > search_start)
search_start = root->last_insert.objectid;
ins->flags = 0;
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
check_failed:
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btrfs_init_path(&path);
ins->objectid = search_start;
ins->offset = 0;
start_found = 0;
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ret = btrfs_search_slot(root, ins, &path, 0, 0);
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if (ret < 0)
goto error;
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if (path.slots[0] > 0)
path.slots[0]--;
while (1) {
l = &path.nodes[0]->leaf;
slot = path.slots[0];
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if (slot >= btrfs_header_nritems(&l->header)) {
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ret = btrfs_next_leaf(root, &path);
if (ret == 0)
continue;
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if (ret < 0)
goto error;
if (!start_found) {
ins->objectid = search_start;
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ins->offset = (u64)-1;
start_found = 1;
goto check_pending;
}
ins->objectid = last_block > search_start ?
last_block : search_start;
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ins->offset = (u64)-1;
goto check_pending;
}
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btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
if (key.objectid >= search_start) {
if (start_found) {
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if (last_block < search_start)
last_block = search_start;
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hole_size = key.objectid - last_block;
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if (hole_size > total_needed) {
ins->objectid = last_block;
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ins->offset = hole_size;
goto check_pending;
}
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}
}
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start_found = 1;
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last_block = key.objectid + key.offset;
path.slots[0]++;
}
// FIXME -ENOSPC
check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
*/
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btrfs_release_path(root, &path);
BUG_ON(ins->objectid < search_start);
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for (test_block = ins->objectid;
test_block < ins->objectid + total_needed; test_block++) {
if (radix_tree_lookup(&root->pinned_radix, test_block)) {
search_start = test_block + 1;
goto check_failed;
}
}
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BUG_ON(root->current_insert.offset);
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root->current_insert.offset = total_needed - num_blocks;
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root->current_insert.objectid = ins->objectid + num_blocks;
root->current_insert.flags = 0;
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root->last_insert.objectid = ins->objectid;
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ins->offset = num_blocks;
return 0;
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error:
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btrfs_release_path(root, &path);
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return ret;
}
/*
* finds a free extent and does all the dirty work required for allocation
* returns the key for the extent through ins, and a tree buffer for
* the first block of the extent through buf.
*
* returns 0 if everything worked, non-zero otherwise.
*/
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static int alloc_extent(struct btrfs_root *root, u64 num_blocks,
u64 search_start, u64 search_end, u64 owner,
struct btrfs_key *ins)
{
int ret;
int pending_ret;
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struct btrfs_root *extent_root = root->extent_root;
struct btrfs_extent_item extent_item;
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btrfs_set_extent_refs(&extent_item, 1);
btrfs_set_extent_owner(&extent_item, owner);
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if (root == extent_root) {
BUG_ON(extent_root->current_insert.offset == 0);
BUG_ON(num_blocks != 1);
BUG_ON(extent_root->current_insert.flags ==
extent_root->current_insert.offset);
ins->offset = 1;
ins->objectid = extent_root->current_insert.objectid +
extent_root->current_insert.flags++;
return 0;
}
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ret = find_free_extent(root, num_blocks, search_start,
search_end, ins);
if (ret)
return ret;
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ret = btrfs_insert_item(extent_root, ins, &extent_item,
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sizeof(extent_item));
finish_current_insert(extent_root);
pending_ret = run_pending(extent_root);
if (ret)
return ret;
if (pending_ret)
return pending_ret;
return 0;
}
/*
* helper function to allocate a block for a given tree
* returns the tree buffer or NULL.
*/
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struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root)
{
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struct btrfs_key ins;
int ret;
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struct btrfs_buffer *buf;
ret = alloc_extent(root, 1, 0, (unsigned long)-1,
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btrfs_header_parentid(&root->node->node.header),
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&ins);
if (ret) {
BUG();
return NULL;
}
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buf = find_tree_block(root, ins.objectid);
dirty_tree_block(root, buf);
return buf;
}
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/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
*/
static int walk_down_tree(struct btrfs_root *root,
struct btrfs_path *path, int *level)
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{
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struct btrfs_buffer *next;
struct btrfs_buffer *cur;
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u64 blocknr;
int ret;
u32 refs;
ret = lookup_block_ref(root, path->nodes[*level]->blocknr, &refs);
BUG_ON(ret);
if (refs > 1)
goto out;
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/*
* walk down to the last node level and free all the leaves
*/
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while(*level > 0) {
cur = path->nodes[*level];
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if (path->slots[*level] >=
btrfs_header_nritems(&cur->node.header))
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break;
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blocknr = btrfs_node_blockptr(&cur->node, path->slots[*level]);
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ret = lookup_block_ref(root, blocknr, &refs);
if (refs != 1 || *level == 1) {
path->slots[*level]++;
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ret = btrfs_free_extent(root, blocknr, 1);
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BUG_ON(ret);
continue;
}
BUG_ON(ret);
next = read_tree_block(root, blocknr);
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if (path->nodes[*level-1])
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btrfs_block_release(root, path->nodes[*level-1]);
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path->nodes[*level-1] = next;
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*level = btrfs_header_level(&next->node.header);
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path->slots[*level] = 0;
}
out:
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ret = btrfs_free_extent(root, path->nodes[*level]->blocknr, 1);
btrfs_block_release(root, path->nodes[*level]);
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path->nodes[*level] = NULL;
*level += 1;
BUG_ON(ret);
return 0;
}
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/*
* helper for dropping snapshots. This walks back up the tree in the path
* to find the first node higher up where we haven't yet gone through
* all the slots
*/
static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
int *level)
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{
int i;
int slot;
int ret;
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for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
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slot = path->slots[i];
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if (slot <
btrfs_header_nritems(&path->nodes[i]->node.header)- 1) {
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path->slots[i]++;
*level = i;
return 0;
} else {
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ret = btrfs_free_extent(root,
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path->nodes[*level]->blocknr, 1);
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btrfs_block_release(root, path->nodes[*level]);
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path->nodes[*level] = NULL;
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*level = i + 1;
BUG_ON(ret);
}
}
return 1;
}
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/*
* drop the reference count on the tree rooted at 'snap'. This traverses
* the tree freeing any blocks that have a ref count of zero after being
* decremented.
*/
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int btrfs_drop_snapshot(struct btrfs_root *root, struct btrfs_buffer *snap)
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{
int ret = 0;
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int wret;
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int level;
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struct btrfs_path path;
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int i;
int orig_level;
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btrfs_init_path(&path);
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level = btrfs_header_level(&snap->node.header);
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orig_level = level;
path.nodes[level] = snap;
path.slots[level] = 0;
while(1) {
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wret = walk_down_tree(root, &path, &level);
if (wret > 0)
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break;
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if (wret < 0)
ret = wret;
wret = walk_up_tree(root, &path, &level);
if (wret > 0)
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break;
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if (wret < 0)
ret = wret;
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}
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for (i = 0; i <= orig_level; i++) {
if (path.nodes[i]) {
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btrfs_block_release(root, path.nodes[i]);
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}
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}
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return ret;
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}