-#include <linux/module.h>
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/highmem.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
+#include "print-tree.h"
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level);
static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size);
-static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct buffer_head *dst, struct buffer_head
- *src);
-static int balance_node_right(struct btrfs_trans_handle *trans, struct
- btrfs_root *root, struct buffer_head *dst_buf,
- struct buffer_head *src_buf);
+ *root, struct btrfs_key *ins_key,
+ struct btrfs_path *path, int data_size);
+static int push_node_left(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *dst,
+ struct extent_buffer *src);
+static int balance_node_right(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *dst_buf,
+ struct extent_buffer *src_buf);
static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot);
memset(p, 0, sizeof(*p));
}
+struct btrfs_path *btrfs_alloc_path(void)
+{
+ struct btrfs_path *path;
+ path = kmem_cache_alloc(btrfs_path_cachep, GFP_NOFS);
+ if (path) {
+ btrfs_init_path(path);
+ path->reada = 1;
+ }
+ return path;
+}
+
+void btrfs_free_path(struct btrfs_path *p)
+{
+ btrfs_release_path(NULL, p);
+ kmem_cache_free(btrfs_path_cachep, p);
+}
+
void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
{
int i;
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
if (!p->nodes[i])
break;
- btrfs_block_release(root, p->nodes[i]);
+ free_extent_buffer(p->nodes[i]);
}
memset(p, 0, sizeof(*p));
}
-static int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct buffer_head *buf, struct buffer_head
- *parent, int parent_slot, struct buffer_head
- **cow_ret)
+static int __btrfs_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer *parent, int parent_slot,
+ struct extent_buffer **cow_ret,
+ u64 search_start, u64 empty_size)
{
- struct buffer_head *cow;
- struct btrfs_node *cow_node;
+ struct extent_buffer *cow;
+ int ret = 0;
+ int different_trans = 0;
- if (btrfs_header_generation(btrfs_buffer_header(buf)) ==
- trans->transid) {
- *cow_ret = buf;
- return 0;
+ WARN_ON(root->ref_cows && trans->transid != root->last_trans);
+
+ cow = btrfs_alloc_free_block(trans, root, search_start, empty_size);
+ if (IS_ERR(cow))
+ return PTR_ERR(cow);
+
+ if (buf->len != root->sectorsize || cow->len != root->sectorsize)
+ WARN_ON(1);
+
+ copy_extent_buffer(cow, buf, 0, 0, cow->len);
+ btrfs_set_header_blocknr(cow, extent_buffer_blocknr(cow));
+ btrfs_set_header_generation(cow, trans->transid);
+ btrfs_set_header_owner(cow, root->root_key.objectid);
+
+ WARN_ON(btrfs_header_generation(buf) > trans->transid);
+ if (btrfs_header_generation(buf) != trans->transid) {
+ different_trans = 1;
+ ret = btrfs_inc_ref(trans, root, buf);
+ if (ret)
+ return ret;
+ } else {
+ clean_tree_block(trans, root, buf);
}
- cow = btrfs_alloc_free_block(trans, root);
- cow_node = btrfs_buffer_node(cow);
- memcpy(cow_node, btrfs_buffer_node(buf), root->blocksize);
- btrfs_set_header_blocknr(&cow_node->header, cow->b_blocknr);
- btrfs_set_header_generation(&cow_node->header, trans->transid);
- *cow_ret = cow;
- btrfs_mark_buffer_dirty(cow);
- btrfs_inc_ref(trans, root, buf);
+
if (buf == root->node) {
root->node = cow;
- get_bh(cow);
- if (buf != root->commit_root)
- btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
- btrfs_block_release(root, buf);
+ extent_buffer_get(cow);
+ if (buf != root->commit_root) {
+ btrfs_free_extent(trans, root,
+ extent_buffer_blocknr(buf), 1, 1);
+ }
+ free_extent_buffer(buf);
} else {
- btrfs_set_node_blockptr(btrfs_buffer_node(parent), parent_slot,
- cow->b_blocknr);
+ btrfs_set_node_blockptr(parent, parent_slot,
+ extent_buffer_blocknr(cow));
btrfs_mark_buffer_dirty(parent);
- btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1);
+ WARN_ON(btrfs_header_generation(parent) != trans->transid);
+ btrfs_free_extent(trans, root, extent_buffer_blocknr(buf),1,1);
+ }
+ free_extent_buffer(buf);
+ btrfs_mark_buffer_dirty(cow);
+ *cow_ret = cow;
+ return 0;
+}
+
+int btrfs_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *buf,
+ struct extent_buffer *parent, int parent_slot,
+ struct extent_buffer **cow_ret)
+{
+ u64 search_start;
+ if (trans->transaction != root->fs_info->running_transaction) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->running_transaction->transid);
+ WARN_ON(1);
+ }
+ if (trans->transid != root->fs_info->generation) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->generation);
+ WARN_ON(1);
+ }
+ if (btrfs_header_generation(buf) == trans->transid) {
+ *cow_ret = buf;
+ return 0;
+ }
+
+ search_start = extent_buffer_blocknr(buf) & ~((u64)65535);
+ return __btrfs_cow_block(trans, root, buf, parent,
+ parent_slot, cow_ret, search_start, 0);
+}
+
+static int close_blocks(u64 blocknr, u64 other)
+{
+ if (blocknr < other && other - blocknr < 8)
+ return 1;
+ if (blocknr > other && blocknr - other < 8)
+ return 1;
+ return 0;
+}
+
+#if 0
+static int should_defrag_leaf(struct extent_buffer *eb)
+{
+ return 0;
+ struct btrfs_leaf *leaf = btrfs_buffer_leaf(eb);
+ struct btrfs_disk_key *key;
+ u32 nritems;
+
+ if (buffer_defrag(bh))
+ return 1;
+
+ nritems = btrfs_header_nritems(&leaf->header);
+ if (nritems == 0)
+ return 0;
+
+ key = &leaf->items[0].key;
+ if (btrfs_disk_key_type(key) == BTRFS_DIR_ITEM_KEY)
+ return 1;
+
+ key = &leaf->items[nritems-1].key;
+ if (btrfs_disk_key_type(key) == BTRFS_DIR_ITEM_KEY)
+ return 1;
+ if (nritems > 4) {
+ key = &leaf->items[nritems/2].key;
+ if (btrfs_disk_key_type(key) == BTRFS_DIR_ITEM_KEY)
+ return 1;
}
- btrfs_block_release(root, buf);
return 0;
}
+#endif
+
+int btrfs_realloc_node(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *parent,
+ int cache_only, u64 *last_ret)
+{
+ return 0;
+#if 0
+ struct btrfs_node *parent_node;
+ struct extent_buffer *cur_eb;
+ struct extent_buffer *tmp_eb;
+ u64 blocknr;
+ u64 search_start = *last_ret;
+ u64 last_block = 0;
+ u64 other;
+ u32 parent_nritems;
+ int start_slot;
+ int end_slot;
+ int i;
+ int err = 0;
+ int parent_level;
+
+ if (trans->transaction != root->fs_info->running_transaction) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->running_transaction->transid);
+ WARN_ON(1);
+ }
+ if (trans->transid != root->fs_info->generation) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->generation);
+ WARN_ON(1);
+ }
+ if (buffer_defrag_done(parent))
+ return 0;
+
+ parent_node = btrfs_buffer_node(parent);
+ parent_nritems = btrfs_header_nritems(&parent_node->header);
+ parent_level = btrfs_header_level(&parent_node->header);
+
+ start_slot = 0;
+ end_slot = parent_nritems;
+
+ if (parent_nritems == 1)
+ return 0;
+
+ for (i = start_slot; i < end_slot; i++) {
+ int close = 1;
+ blocknr = btrfs_node_blockptr(parent_node, i);
+ if (last_block == 0)
+ last_block = blocknr;
+ if (i > 0) {
+ other = btrfs_node_blockptr(parent_node, i - 1);
+ close = close_blocks(blocknr, other);
+ }
+ if (close && i < end_slot - 1) {
+ other = btrfs_node_blockptr(parent_node, i + 1);
+ close = close_blocks(blocknr, other);
+ }
+ if (close) {
+ last_block = blocknr;
+ continue;
+ }
+
+ cur_bh = btrfs_find_tree_block(root, blocknr);
+ if (!cur_bh || !buffer_uptodate(cur_bh) ||
+ buffer_locked(cur_bh) ||
+ (parent_level != 1 && !buffer_defrag(cur_bh)) ||
+ (parent_level == 1 && !should_defrag_leaf(cur_bh))) {
+ if (cache_only) {
+ brelse(cur_bh);
+ continue;
+ }
+ if (!cur_bh || !buffer_uptodate(cur_bh) ||
+ buffer_locked(cur_bh)) {
+ brelse(cur_bh);
+ cur_bh = read_tree_block(root, blocknr);
+ }
+ }
+ if (search_start == 0)
+ search_start = last_block & ~((u64)65535);
+
+ err = __btrfs_cow_block(trans, root, cur_bh, parent, i,
+ &tmp_bh, search_start,
+ min(8, end_slot - i));
+ if (err) {
+ brelse(cur_bh);
+ break;
+ }
+ search_start = bh_blocknr(tmp_bh);
+ *last_ret = search_start;
+ if (parent_level == 1)
+ clear_buffer_defrag(tmp_bh);
+ set_buffer_defrag_done(tmp_bh);
+ brelse(tmp_bh);
+ }
+ return err;
+#endif
+}
/*
* The leaf data grows from end-to-front in the node.
* which is the stop of the leaf data stack
*/
static inline unsigned int leaf_data_end(struct btrfs_root *root,
- struct btrfs_leaf *leaf)
+ struct extent_buffer *leaf)
{
- u32 nr = btrfs_header_nritems(&leaf->header);
+ u32 nr = btrfs_header_nritems(leaf);
if (nr == 0)
return BTRFS_LEAF_DATA_SIZE(root);
- return btrfs_item_offset(leaf->items + nr - 1);
-}
-
-/*
- * The space between the end of the leaf items and
- * the start of the leaf data. IOW, how much room
- * the leaf has left for both items and data
- */
-int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf)
-{
- int data_end = leaf_data_end(root, leaf);
- int nritems = btrfs_header_nritems(&leaf->header);
- char *items_end = (char *)(leaf->items + nritems + 1);
- return (char *)(btrfs_leaf_data(leaf) + data_end) - (char *)items_end;
+ return btrfs_item_offset_nr(leaf, nr - 1);
}
/*
return 1;
if (k1.objectid < k2->objectid)
return -1;
- if (k1.offset > k2->offset)
+ if (k1.type > k2->type)
return 1;
- if (k1.offset < k2->offset)
+ if (k1.type < k2->type)
return -1;
- if (k1.flags > k2->flags)
+ if (k1.offset > k2->offset)
return 1;
- if (k1.flags < k2->flags)
+ if (k1.offset < k2->offset)
return -1;
return 0;
}
static int check_node(struct btrfs_root *root, struct btrfs_path *path,
int level)
{
- int i;
- struct btrfs_node *parent = NULL;
- struct btrfs_node *node = btrfs_buffer_node(path->nodes[level]);
+ struct extent_buffer *parent = NULL;
+ struct extent_buffer *node = path->nodes[level];
+ struct btrfs_disk_key parent_key;
+ struct btrfs_disk_key node_key;
int parent_slot;
- u32 nritems = btrfs_header_nritems(&node->header);
+ int slot;
+ struct btrfs_key cpukey;
+ u32 nritems = btrfs_header_nritems(node);
if (path->nodes[level + 1])
- parent = btrfs_buffer_node(path->nodes[level + 1]);
- parent_slot = path->slots[level + 1];
+ parent = path->nodes[level + 1];
+
+ slot = path->slots[level];
BUG_ON(nritems == 0);
if (parent) {
- struct btrfs_disk_key *parent_key;
- parent_key = &parent->ptrs[parent_slot].key;
- BUG_ON(memcmp(parent_key, &node->ptrs[0].key,
+ parent_slot = path->slots[level + 1];
+ btrfs_node_key(parent, &parent_key, parent_slot);
+ btrfs_node_key(node, &node_key, 0);
+ BUG_ON(memcmp(&parent_key, &node_key,
sizeof(struct btrfs_disk_key)));
BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
- btrfs_header_blocknr(&node->header));
+ btrfs_header_blocknr(node));
}
BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root));
- for (i = 0; nritems > 1 && i < nritems - 2; i++) {
- struct btrfs_key cpukey;
- btrfs_disk_key_to_cpu(&cpukey, &node->ptrs[i + 1].key);
- BUG_ON(comp_keys(&node->ptrs[i].key, &cpukey) >= 0);
+ if (slot != 0) {
+ btrfs_node_key_to_cpu(node, &cpukey, slot - 1);
+ btrfs_node_key(node, &node_key, slot);
+ BUG_ON(comp_keys(&node_key, &cpukey) <= 0);
+ }
+ if (slot < nritems - 1) {
+ btrfs_node_key_to_cpu(node, &cpukey, slot + 1);
+ btrfs_node_key(node, &node_key, slot);
+ BUG_ON(comp_keys(&node_key, &cpukey) >= 0);
}
return 0;
}
static int check_leaf(struct btrfs_root *root, struct btrfs_path *path,
int level)
{
- int i;
- struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[level]);
- struct btrfs_node *parent = NULL;
+ struct extent_buffer *leaf = path->nodes[level];
+ struct extent_buffer *parent = NULL;
int parent_slot;
- u32 nritems = btrfs_header_nritems(&leaf->header);
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key parent_key;
+ struct btrfs_disk_key leaf_key;
+ int slot = path->slots[0];
+
+ u32 nritems = btrfs_header_nritems(leaf);
if (path->nodes[level + 1])
- parent = btrfs_buffer_node(path->nodes[level + 1]);
- parent_slot = path->slots[level + 1];
- BUG_ON(btrfs_leaf_free_space(root, leaf) < 0);
+ parent = path->nodes[level + 1];
if (nritems == 0)
return 0;
if (parent) {
- struct btrfs_disk_key *parent_key;
- parent_key = &parent->ptrs[parent_slot].key;
- BUG_ON(memcmp(parent_key, &leaf->items[0].key,
+ parent_slot = path->slots[level + 1];
+ btrfs_node_key(parent, &parent_key, parent_slot);
+ btrfs_item_key(leaf, &leaf_key, 0);
+
+ BUG_ON(memcmp(&parent_key, &leaf_key,
sizeof(struct btrfs_disk_key)));
BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
- btrfs_header_blocknr(&leaf->header));
+ btrfs_header_blocknr(leaf));
}
+#if 0
for (i = 0; nritems > 1 && i < nritems - 2; i++) {
- struct btrfs_key cpukey;
- btrfs_disk_key_to_cpu(&cpukey, &leaf->items[i + 1].key);
- BUG_ON(comp_keys(&leaf->items[i].key,
- &cpukey) >= 0);
- BUG_ON(btrfs_item_offset(leaf->items + i) !=
- btrfs_item_end(leaf->items + i + 1));
+ btrfs_item_key_to_cpu(leaf, &cpukey, i + 1);
+ btrfs_item_key(leaf, &leaf_key, i);
+ if (comp_keys(&leaf_key, &cpukey) >= 0) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad key\n", i);
+ BUG_ON(1);
+ }
+ if (btrfs_item_offset_nr(leaf, i) !=
+ btrfs_item_end_nr(leaf, i + 1)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", i);
+ BUG_ON(1);
+ }
if (i == 0) {
- BUG_ON(btrfs_item_offset(leaf->items + i) +
- btrfs_item_size(leaf->items + i) !=
- BTRFS_LEAF_DATA_SIZE(root));
+ if (btrfs_item_offset_nr(leaf, i) +
+ btrfs_item_size_nr(leaf, i) !=
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d first offset bad\n", i);
+ BUG_ON(1);
+ }
+ }
+ }
+ if (nritems > 0) {
+ if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d bad size \n", nritems - 1);
+ BUG_ON(1);
+ }
+ }
+#endif
+ if (slot != 0 && slot < nritems - 1) {
+ btrfs_item_key(leaf, &leaf_key, slot);
+ btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1);
+ if (comp_keys(&leaf_key, &cpukey) <= 0) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad key\n", slot);
+ BUG_ON(1);
+ }
+ if (btrfs_item_offset_nr(leaf, slot - 1) !=
+ btrfs_item_end_nr(leaf, slot)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", slot);
+ BUG_ON(1);
}
}
+ if (slot < nritems - 1) {
+ btrfs_item_key(leaf, &leaf_key, slot);
+ btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1);
+ BUG_ON(comp_keys(&leaf_key, &cpukey) >= 0);
+ if (btrfs_item_offset_nr(leaf, slot) !=
+ btrfs_item_end_nr(leaf, slot + 1)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", slot);
+ BUG_ON(1);
+ }
+ }
+ BUG_ON(btrfs_item_offset_nr(leaf, 0) +
+ btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root));
return 0;
}
static int check_block(struct btrfs_root *root, struct btrfs_path *path,
int level)
{
+ struct extent_buffer *buf = path->nodes[level];
+ char fsid[BTRFS_FSID_SIZE];
+
+ read_extent_buffer(buf, fsid, (unsigned long)btrfs_header_fsid(buf),
+ BTRFS_FSID_SIZE);
+
+ if (memcmp(fsid, root->fs_info->fsid, BTRFS_FSID_SIZE)) {
+ int i = 0;
+ printk("warning bad block %Lu\n", buf->start);
+ if (!btrfs_buffer_uptodate(buf)) {
+ WARN_ON(1);
+ }
+ for (i = 0; i < BTRFS_FSID_SIZE; i++) {
+ printk("%x:%x ", root->fs_info->fsid[i], fsid[i]);
+ }
+ printk("\n");
+ // BUG();
+ }
if (level == 0)
return check_leaf(root, path, level);
return check_node(root, path, level);
}
/*
- * search for key in the array p. items p are item_size apart
- * and there are 'max' items in p
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
* the slot in the array is returned via slot, and it points to
* the place where you would insert key if it is not found in
* the array.
*
* slot may point to max if the key is bigger than all of the keys
*/
-static int generic_bin_search(char *p, int item_size, struct btrfs_key *key,
- int max, int *slot)
+static int generic_bin_search(struct extent_buffer *eb, unsigned long p,
+ int item_size, struct btrfs_key *key,
+ int max, int *slot)
{
int low = 0;
int high = max;
int mid;
int ret;
struct btrfs_disk_key *tmp;
+ struct btrfs_disk_key unaligned;
+ unsigned long offset;
+ char *map_token = NULL;
+ char *kaddr = NULL;
+ unsigned long map_start = 0;
+ unsigned long map_len = 0;
while(low < high) {
mid = (low + high) / 2;
- tmp = (struct btrfs_disk_key *)(p + mid * item_size);
+ offset = p + mid * item_size;
+
+ if (!map_token || offset < map_start ||
+ (offset + sizeof(struct btrfs_disk_key)) >
+ map_start + map_len) {
+ if (map_token)
+ unmap_extent_buffer(eb, map_token, KM_USER0);
+ map_extent_buffer(eb, offset, &map_token, &kaddr,
+ &map_start, &map_len, KM_USER0);
+
+ }
+ if (offset + sizeof(struct btrfs_disk_key) >
+ map_start + map_len) {
+ unmap_extent_buffer(eb, map_token, KM_USER0);
+ read_extent_buffer(eb, &unaligned,
+ offset, sizeof(unaligned));
+ map_token = NULL;
+ tmp = &unaligned;
+ } else {
+ tmp = (struct btrfs_disk_key *)(kaddr + offset -
+ map_start);
+ }
ret = comp_keys(tmp, key);
if (ret < 0)
high = mid;
else {
*slot = mid;
+ unmap_extent_buffer(eb, map_token, KM_USER0);
return 0;
}
}
*slot = low;
+ if (map_token)
+ unmap_extent_buffer(eb, map_token, KM_USER0);
return 1;
}
* simple bin_search frontend that does the right thing for
* leaves vs nodes
*/
-static int bin_search(struct btrfs_node *c, struct btrfs_key *key, int *slot)
+static int bin_search(struct extent_buffer *eb, struct btrfs_key *key,
+ int level, int *slot)
{
- if (btrfs_is_leaf(c)) {
- struct btrfs_leaf *l = (struct btrfs_leaf *)c;
- return generic_bin_search((void *)l->items,
+ if (level == 0) {
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_leaf, items),
sizeof(struct btrfs_item),
- key, btrfs_header_nritems(&c->header),
+ key, btrfs_header_nritems(eb),
slot);
} else {
- return generic_bin_search((void *)c->ptrs,
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
sizeof(struct btrfs_key_ptr),
- key, btrfs_header_nritems(&c->header),
+ key, btrfs_header_nritems(eb),
slot);
}
return -1;
}
-static struct buffer_head *read_node_slot(struct btrfs_root *root,
- struct buffer_head *parent_buf,
- int slot)
+static struct extent_buffer *read_node_slot(struct btrfs_root *root,
+ struct extent_buffer *parent, int slot)
{
- struct btrfs_node *node = btrfs_buffer_node(parent_buf);
if (slot < 0)
return NULL;
- if (slot >= btrfs_header_nritems(&node->header))
+ if (slot >= btrfs_header_nritems(parent))
return NULL;
- return read_tree_block(root, btrfs_node_blockptr(node, slot));
+ return read_tree_block(root, btrfs_node_blockptr(parent, slot));
}
static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level)
{
- struct buffer_head *right_buf;
- struct buffer_head *mid_buf;
- struct buffer_head *left_buf;
- struct buffer_head *parent_buf = NULL;
- struct btrfs_node *right = NULL;
- struct btrfs_node *mid;
- struct btrfs_node *left = NULL;
- struct btrfs_node *parent = NULL;
+ struct extent_buffer *right = NULL;
+ struct extent_buffer *mid;
+ struct extent_buffer *left = NULL;
+ struct extent_buffer *parent = NULL;
int ret = 0;
int wret;
int pslot;
int orig_slot = path->slots[level];
+ int err_on_enospc = 0;
u64 orig_ptr;
if (level == 0)
return 0;
- mid_buf = path->nodes[level];
- mid = btrfs_buffer_node(mid_buf);
+ mid = path->nodes[level];
orig_ptr = btrfs_node_blockptr(mid, orig_slot);
if (level < BTRFS_MAX_LEVEL - 1)
- parent_buf = path->nodes[level + 1];
+ parent = path->nodes[level + 1];
pslot = path->slots[level + 1];
/*
* deal with the case where there is only one pointer in the root
* by promoting the node below to a root
*/
- if (!parent_buf) {
- struct buffer_head *child;
- u64 blocknr = mid_buf->b_blocknr;
+ if (!parent) {
+ struct extent_buffer *child;
+ u64 blocknr = extent_buffer_blocknr(mid);
- if (btrfs_header_nritems(&mid->header) != 1)
+ if (btrfs_header_nritems(mid) != 1)
return 0;
/* promote the child to a root */
- child = read_node_slot(root, mid_buf, 0);
+ child = read_node_slot(root, mid, 0);
BUG_ON(!child);
root->node = child;
path->nodes[level] = NULL;
- clean_tree_block(trans, root, mid_buf);
- wait_on_buffer(mid_buf);
+ clean_tree_block(trans, root, mid);
+ wait_on_tree_block_writeback(root, mid);
/* once for the path */
- btrfs_block_release(root, mid_buf);
+ free_extent_buffer(mid);
/* once for the root ptr */
- btrfs_block_release(root, mid_buf);
+ free_extent_buffer(mid);
return btrfs_free_extent(trans, root, blocknr, 1, 1);
}
- parent = btrfs_buffer_node(parent_buf);
-
- if (btrfs_header_nritems(&mid->header) >
+ if (btrfs_header_nritems(mid) >
BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
return 0;
- left_buf = read_node_slot(root, parent_buf, pslot - 1);
- right_buf = read_node_slot(root, parent_buf, pslot + 1);
+ if (btrfs_header_nritems(mid) < 2)
+ err_on_enospc = 1;
+
+ left = read_node_slot(root, parent, pslot - 1);
+ if (left) {
+ wret = btrfs_cow_block(trans, root, left,
+ parent, pslot - 1, &left);
+ if (wret) {
+ ret = wret;
+ goto enospc;
+ }
+ }
+ right = read_node_slot(root, parent, pslot + 1);
+ if (right) {
+ wret = btrfs_cow_block(trans, root, right,
+ parent, pslot + 1, &right);
+ if (wret) {
+ ret = wret;
+ goto enospc;
+ }
+ }
/* first, try to make some room in the middle buffer */
- if (left_buf) {
- btrfs_cow_block(trans, root, left_buf, parent_buf, pslot - 1,
- &left_buf);
- left = btrfs_buffer_node(left_buf);
- orig_slot += btrfs_header_nritems(&left->header);
- wret = push_node_left(trans, root, left_buf, mid_buf);
+ if (left) {
+ orig_slot += btrfs_header_nritems(left);
+ wret = push_node_left(trans, root, left, mid);
if (wret < 0)
ret = wret;
+ if (btrfs_header_nritems(mid) < 2)
+ err_on_enospc = 1;
}
/*
* then try to empty the right most buffer into the middle
*/
- if (right_buf) {
- btrfs_cow_block(trans, root, right_buf, parent_buf, pslot + 1,
- &right_buf);
- right = btrfs_buffer_node(right_buf);
- wret = push_node_left(trans, root, mid_buf, right_buf);
- if (wret < 0)
+ if (right) {
+ wret = push_node_left(trans, root, mid, right);
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
- if (btrfs_header_nritems(&right->header) == 0) {
- u64 blocknr = right_buf->b_blocknr;
- clean_tree_block(trans, root, right_buf);
- wait_on_buffer(right_buf);
- btrfs_block_release(root, right_buf);
- right_buf = NULL;
+ if (btrfs_header_nritems(right) == 0) {
+ u64 blocknr = extent_buffer_blocknr(right);
+ clean_tree_block(trans, root, right);
+ wait_on_tree_block_writeback(root, right);
+ free_extent_buffer(right);
right = NULL;
wret = del_ptr(trans, root, path, level + 1, pslot +
1);
if (wret)
ret = wret;
} else {
- btrfs_memcpy(root, parent,
- &parent->ptrs[pslot + 1].key,
- &right->ptrs[0].key,
- sizeof(struct btrfs_disk_key));
- btrfs_mark_buffer_dirty(parent_buf);
+ struct btrfs_disk_key right_key;
+ btrfs_node_key(right, &right_key, 0);
+ btrfs_set_node_key(parent, &right_key, pslot + 1);
+ btrfs_mark_buffer_dirty(parent);
}
}
- if (btrfs_header_nritems(&mid->header) == 1) {
+ if (btrfs_header_nritems(mid) == 1) {
/*
* we're not allowed to leave a node with one item in the
* tree during a delete. A deletion from lower in the tree
* otherwise we would have pulled some pointers from the
* right
*/
- BUG_ON(!left_buf);
- wret = balance_node_right(trans, root, mid_buf, left_buf);
- if (wret < 0)
+ BUG_ON(!left);
+ wret = balance_node_right(trans, root, mid, left);
+ if (wret < 0) {
ret = wret;
+ goto enospc;
+ }
BUG_ON(wret == 1);
}
- if (btrfs_header_nritems(&mid->header) == 0) {
+ if (btrfs_header_nritems(mid) == 0) {
/* we've managed to empty the middle node, drop it */
- u64 blocknr = mid_buf->b_blocknr;
- clean_tree_block(trans, root, mid_buf);
- wait_on_buffer(mid_buf);
- btrfs_block_release(root, mid_buf);
- mid_buf = NULL;
+ u64 blocknr = extent_buffer_blocknr(mid);
+ clean_tree_block(trans, root, mid);
+ wait_on_tree_block_writeback(root, mid);
+ free_extent_buffer(mid);
mid = NULL;
wret = del_ptr(trans, root, path, level + 1, pslot);
if (wret)
ret = wret;
} else {
/* update the parent key to reflect our changes */
- btrfs_memcpy(root, parent,
- &parent->ptrs[pslot].key, &mid->ptrs[0].key,
- sizeof(struct btrfs_disk_key));
- btrfs_mark_buffer_dirty(parent_buf);
+ struct btrfs_disk_key mid_key;
+ btrfs_node_key(mid, &mid_key, 0);
+ btrfs_set_node_key(parent, &mid_key, pslot);
+ btrfs_mark_buffer_dirty(parent);
}
/* update the path */
- if (left_buf) {
- if (btrfs_header_nritems(&left->header) > orig_slot) {
- get_bh(left_buf);
- path->nodes[level] = left_buf;
+ if (left) {
+ if (btrfs_header_nritems(left) > orig_slot) {
+ extent_buffer_get(left);
+ path->nodes[level] = left;
path->slots[level + 1] -= 1;
path->slots[level] = orig_slot;
- if (mid_buf)
- btrfs_block_release(root, mid_buf);
+ if (mid)
+ free_extent_buffer(mid);
} else {
- orig_slot -= btrfs_header_nritems(&left->header);
+ orig_slot -= btrfs_header_nritems(left);
path->slots[level] = orig_slot;
}
}
/* double check we haven't messed things up */
check_block(root, path, level);
if (orig_ptr !=
- btrfs_node_blockptr(btrfs_buffer_node(path->nodes[level]),
- path->slots[level]))
+ btrfs_node_blockptr(path->nodes[level], path->slots[level]))
BUG();
-
- if (right_buf)
- btrfs_block_release(root, right_buf);
- if (left_buf)
- btrfs_block_release(root, left_buf);
+enospc:
+ if (right)
+ free_extent_buffer(right);
+ if (left)
+ free_extent_buffer(left);
return ret;
}
+/* returns zero if the push worked, non-zero otherwise */
+static int push_nodes_for_insert(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
+{
+ struct extent_buffer *right = NULL;
+ struct extent_buffer *mid;
+ struct extent_buffer *left = NULL;
+ struct extent_buffer *parent = NULL;
+ int ret = 0;
+ int wret;
+ int pslot;
+ int orig_slot = path->slots[level];
+ u64 orig_ptr;
+
+ if (level == 0)
+ return 1;
+
+ mid = path->nodes[level];
+ orig_ptr = btrfs_node_blockptr(mid, orig_slot);
+
+ if (level < BTRFS_MAX_LEVEL - 1)
+ parent = path->nodes[level + 1];
+ pslot = path->slots[level + 1];
+
+ if (!parent)
+ return 1;
+
+ left = read_node_slot(root, parent, pslot - 1);
+
+ /* first, try to make some room in the middle buffer */
+ if (left) {
+ u32 left_nr;
+ left_nr = btrfs_header_nritems(left);
+ if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+ wret = 1;
+ } else {
+ ret = btrfs_cow_block(trans, root, left, parent,
+ pslot - 1, &left);
+ if (ret)
+ wret = 1;
+ else {
+ wret = push_node_left(trans, root,
+ left, mid);
+ }
+ }
+ if (wret < 0)
+ ret = wret;
+ if (wret == 0) {
+ struct btrfs_disk_key disk_key;
+ orig_slot += left_nr;
+ btrfs_node_key(mid, &disk_key, 0);
+ btrfs_set_node_key(parent, &disk_key, pslot);
+ btrfs_mark_buffer_dirty(parent);
+ if (btrfs_header_nritems(left) > orig_slot) {
+ path->nodes[level] = left;
+ path->slots[level + 1] -= 1;
+ path->slots[level] = orig_slot;
+ free_extent_buffer(mid);
+ } else {
+ orig_slot -=
+ btrfs_header_nritems(left);
+ path->slots[level] = orig_slot;
+ free_extent_buffer(left);
+ }
+ check_node(root, path, level);
+ return 0;
+ }
+ free_extent_buffer(left);
+ }
+ right= read_node_slot(root, parent, pslot + 1);
+
+ /*
+ * then try to empty the right most buffer into the middle
+ */
+ if (right) {
+ u32 right_nr;
+ right_nr = btrfs_header_nritems(right);
+ if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+ wret = 1;
+ } else {
+ ret = btrfs_cow_block(trans, root, right,
+ parent, pslot + 1,
+ &right);
+ if (ret)
+ wret = 1;
+ else {
+ wret = balance_node_right(trans, root,
+ right, mid);
+ }
+ }
+ if (wret < 0)
+ ret = wret;
+ if (wret == 0) {
+ struct btrfs_disk_key disk_key;
+
+ btrfs_node_key(right, &disk_key, 0);
+ btrfs_set_node_key(parent, &disk_key, pslot + 1);
+ btrfs_mark_buffer_dirty(parent);
+
+ if (btrfs_header_nritems(mid) <= orig_slot) {
+ path->nodes[level] = right;
+ path->slots[level + 1] += 1;
+ path->slots[level] = orig_slot -
+ btrfs_header_nritems(mid);
+ free_extent_buffer(mid);
+ } else {
+ free_extent_buffer(right);
+ }
+ check_node(root, path, level);
+ return 0;
+ }
+ free_extent_buffer(right);
+ }
+ check_node(root, path, level);
+ return 1;
+}
+
+/*
+ * readahead one full node of leaves
+ */
+static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
+ int level, int slot)
+{
+ struct extent_buffer *node;
+ int i;
+ u32 nritems;
+ u64 blocknr;
+ u64 search;
+ u64 cluster_start;
+ int ret;
+ int nread = 0;
+ int direction = path->reada;
+ struct radix_tree_root found;
+ unsigned long gang[8];
+ struct extent_buffer *eb;
+
+ if (level == 0)
+ return;
+
+ if (!path->nodes[level])
+ return;
+
+ node = path->nodes[level];
+ search = btrfs_node_blockptr(node, slot);
+ eb = btrfs_find_tree_block(root, search);
+ if (eb) {
+ free_extent_buffer(eb);
+ return;
+ }
+
+ init_bit_radix(&found);
+ nritems = btrfs_header_nritems(node);
+ for (i = slot; i < nritems; i++) {
+ blocknr = btrfs_node_blockptr(node, i);
+ set_radix_bit(&found, blocknr);
+ }
+ if (direction > 0) {
+ cluster_start = search - 4;
+ if (cluster_start > search)
+ cluster_start = 0;
+ } else
+ cluster_start = search + 4;
+ while(1) {
+ ret = find_first_radix_bit(&found, gang, 0, ARRAY_SIZE(gang));
+ if (!ret)
+ break;
+ for (i = 0; i < ret; i++) {
+ blocknr = gang[i];
+ clear_radix_bit(&found, blocknr);
+ if (path->reada == 1 && nread > 16)
+ continue;
+ if (close_blocks(cluster_start, blocknr)) {
+ readahead_tree_block(root, blocknr);
+ nread++;
+ cluster_start = blocknr;
+ }
+ }
+ }
+}
/*
* look for key in the tree. path is filled in with nodes along the way
* if key is found, we return zero and you can find the item in the leaf
*root, struct btrfs_key *key, struct btrfs_path *p, int
ins_len, int cow)
{
- struct buffer_head *b;
- struct buffer_head *cow_buf;
- struct btrfs_node *c;
+ struct extent_buffer *b;
+ u64 blocknr;
int slot;
int ret;
int level;
+ int should_reada = p->reada;
+ u8 lowest_level = 0;
+ lowest_level = p->lowest_level;
+ WARN_ON(lowest_level && ins_len);
WARN_ON(p->nodes[0] != NULL);
WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex));
again:
b = root->node;
- get_bh(b);
+ extent_buffer_get(b);
while (b) {
- c = btrfs_buffer_node(b);
- level = btrfs_header_level(&c->header);
+ level = btrfs_header_level(b);
if (cow) {
int wret;
wret = btrfs_cow_block(trans, root, b,
p->nodes[level + 1],
p->slots[level + 1],
- &cow_buf);
- b = cow_buf;
+ &b);
+ if (wret) {
+ free_extent_buffer(b);
+ return wret;
+ }
}
BUG_ON(!cow && ins_len);
- c = btrfs_buffer_node(b);
+ if (level != btrfs_header_level(b))
+ WARN_ON(1);
+ level = btrfs_header_level(b);
p->nodes[level] = b;
ret = check_block(root, p, level);
if (ret)
return -1;
- ret = bin_search(c, key, &slot);
- if (!btrfs_is_leaf(c)) {
+ ret = bin_search(b, key, level, &slot);
+ if (level != 0) {
if (ret && slot > 0)
slot -= 1;
p->slots[level] = slot;
- if (ins_len > 0 && btrfs_header_nritems(&c->header) ==
- BTRFS_NODEPTRS_PER_BLOCK(root)) {
+ if (ins_len > 0 && btrfs_header_nritems(b) >=
+ BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
int sret = split_node(trans, root, p, level);
BUG_ON(sret > 0);
if (sret)
return sret;
b = p->nodes[level];
- c = btrfs_buffer_node(b);
slot = p->slots[level];
} else if (ins_len < 0) {
int sret = balance_level(trans, root, p,
b = p->nodes[level];
if (!b)
goto again;
- c = btrfs_buffer_node(b);
slot = p->slots[level];
- BUG_ON(btrfs_header_nritems(&c->header) == 1);
+ BUG_ON(btrfs_header_nritems(b) == 1);
}
- b = read_tree_block(root, btrfs_node_blockptr(c, slot));
+ /* this is only true while dropping a snapshot */
+ if (level == lowest_level)
+ break;
+ blocknr = btrfs_node_blockptr(b, slot);
+ if (should_reada)
+ reada_for_search(root, p, level, slot);
+ b = read_tree_block(root, btrfs_node_blockptr(b, slot));
} else {
- struct btrfs_leaf *l = (struct btrfs_leaf *)c;
p->slots[level] = slot;
- if (ins_len > 0 && btrfs_leaf_free_space(root, l) <
+ if (ins_len > 0 && btrfs_leaf_free_space(root, b) <
sizeof(struct btrfs_item) + ins_len) {
- int sret = split_leaf(trans, root, p, ins_len);
+ int sret = split_leaf(trans, root, key,
+ p, ins_len);
BUG_ON(sret > 0);
if (sret)
return sret;
* If this fails to write a tree block, it returns -1, but continues
* fixing up the blocks in ram so the tree is consistent.
*/
-static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, struct btrfs_disk_key
- *key, int level)
+static int fixup_low_keys(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_disk_key *key, int level)
{
int i;
int ret = 0;
+ struct extent_buffer *t;
+
for (i = level; i < BTRFS_MAX_LEVEL; i++) {
- struct btrfs_node *t;
int tslot = path->slots[i];
if (!path->nodes[i])
break;
- t = btrfs_buffer_node(path->nodes[i]);
- btrfs_memcpy(root, t, &t->ptrs[tslot].key, key, sizeof(*key));
+ t = path->nodes[i];
+ btrfs_set_node_key(t, key, tslot);
btrfs_mark_buffer_dirty(path->nodes[i]);
if (tslot != 0)
break;
* error, and > 0 if there was no room in the left hand block.
*/
static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct buffer_head *dst_buf, struct
- buffer_head *src_buf)
+ *root, struct extent_buffer *dst,
+ struct extent_buffer *src)
{
- struct btrfs_node *src = btrfs_buffer_node(src_buf);
- struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
int push_items = 0;
int src_nritems;
int dst_nritems;
int ret = 0;
- src_nritems = btrfs_header_nritems(&src->header);
- dst_nritems = btrfs_header_nritems(&dst->header);
+ src_nritems = btrfs_header_nritems(src);
+ dst_nritems = btrfs_header_nritems(dst);
push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
+
if (push_items <= 0) {
return 1;
}
if (src_nritems < push_items)
push_items = src_nritems;
- btrfs_memcpy(root, dst, dst->ptrs + dst_nritems, src->ptrs,
- push_items * sizeof(struct btrfs_key_ptr));
+ copy_extent_buffer(dst, src,
+ btrfs_node_key_ptr_offset(dst_nritems),
+ btrfs_node_key_ptr_offset(0),
+ push_items * sizeof(struct btrfs_key_ptr));
+
if (push_items < src_nritems) {
- btrfs_memmove(root, src, src->ptrs, src->ptrs + push_items,
- (src_nritems - push_items) *
- sizeof(struct btrfs_key_ptr));
- }
- btrfs_set_header_nritems(&src->header, src_nritems - push_items);
- btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
- btrfs_mark_buffer_dirty(src_buf);
- btrfs_mark_buffer_dirty(dst_buf);
+ memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(push_items),
+ (src_nritems - push_items) *
+ sizeof(struct btrfs_key_ptr));
+ }
+ btrfs_set_header_nritems(src, src_nritems - push_items);
+ btrfs_set_header_nritems(dst, dst_nritems + push_items);
+ btrfs_mark_buffer_dirty(src);
+ btrfs_mark_buffer_dirty(dst);
return ret;
}
*
* this will only push up to 1/2 the contents of the left node over
*/
-static int balance_node_right(struct btrfs_trans_handle *trans, struct
- btrfs_root *root, struct buffer_head *dst_buf,
- struct buffer_head *src_buf)
+static int balance_node_right(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *dst,
+ struct extent_buffer *src)
{
- struct btrfs_node *src = btrfs_buffer_node(src_buf);
- struct btrfs_node *dst = btrfs_buffer_node(dst_buf);
int push_items = 0;
int max_push;
int src_nritems;
int dst_nritems;
int ret = 0;
- src_nritems = btrfs_header_nritems(&src->header);
- dst_nritems = btrfs_header_nritems(&dst->header);
+ src_nritems = btrfs_header_nritems(src);
+ dst_nritems = btrfs_header_nritems(dst);
push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
- if (push_items <= 0) {
+ if (push_items <= 0)
return 1;
- }
max_push = src_nritems / 2 + 1;
/* don't try to empty the node */
- if (max_push > src_nritems)
+ if (max_push >= src_nritems)
return 1;
+
if (max_push < push_items)
push_items = max_push;
- btrfs_memmove(root, dst, dst->ptrs + push_items, dst->ptrs,
- dst_nritems * sizeof(struct btrfs_key_ptr));
+ memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items),
+ btrfs_node_key_ptr_offset(0),
+ (dst_nritems) *
+ sizeof(struct btrfs_key_ptr));
- btrfs_memcpy(root, dst, dst->ptrs,
- src->ptrs + src_nritems - push_items,
- push_items * sizeof(struct btrfs_key_ptr));
+ copy_extent_buffer(dst, src,
+ btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(src_nritems - push_items),
+ push_items * sizeof(struct btrfs_key_ptr));
- btrfs_set_header_nritems(&src->header, src_nritems - push_items);
- btrfs_set_header_nritems(&dst->header, dst_nritems + push_items);
+ btrfs_set_header_nritems(src, src_nritems - push_items);
+ btrfs_set_header_nritems(dst, dst_nritems + push_items);
- btrfs_mark_buffer_dirty(src_buf);
- btrfs_mark_buffer_dirty(dst_buf);
+ btrfs_mark_buffer_dirty(src);
+ btrfs_mark_buffer_dirty(dst);
return ret;
}
*
* returns zero on success or < 0 on failure.
*/
-static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int level)
+static int insert_new_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
{
- struct buffer_head *t;
- struct btrfs_node *lower;
- struct btrfs_node *c;
- struct btrfs_disk_key *lower_key;
+ struct extent_buffer *lower;
+ struct extent_buffer *c;
+ struct btrfs_disk_key lower_key;
BUG_ON(path->nodes[level]);
BUG_ON(path->nodes[level-1] != root->node);
- t = btrfs_alloc_free_block(trans, root);
- c = btrfs_buffer_node(t);
- memset(c, 0, root->blocksize);
- btrfs_set_header_nritems(&c->header, 1);
- btrfs_set_header_level(&c->header, level);
- btrfs_set_header_blocknr(&c->header, t->b_blocknr);
- btrfs_set_header_generation(&c->header, trans->transid);
- btrfs_set_header_parentid(&c->header,
- btrfs_header_parentid(btrfs_buffer_header(root->node)));
- lower = btrfs_buffer_node(path->nodes[level-1]);
- if (btrfs_is_leaf(lower))
- lower_key = &((struct btrfs_leaf *)lower)->items[0].key;
+ c = btrfs_alloc_free_block(trans, root,
+ extent_buffer_blocknr(root->node), 0);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ memset_extent_buffer(c, 0, 0, root->nodesize);
+ btrfs_set_header_nritems(c, 1);
+ btrfs_set_header_level(c, level);
+ btrfs_set_header_blocknr(c, extent_buffer_blocknr(c));
+ btrfs_set_header_generation(c, trans->transid);
+ btrfs_set_header_owner(c, root->root_key.objectid);
+ lower = path->nodes[level-1];
+
+ write_extent_buffer(c, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(c),
+ BTRFS_FSID_SIZE);
+ if (level == 1)
+ btrfs_item_key(lower, &lower_key, 0);
else
- lower_key = &lower->ptrs[0].key;
- btrfs_memcpy(root, c, &c->ptrs[0].key, lower_key,
- sizeof(struct btrfs_disk_key));
- btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->b_blocknr);
+ btrfs_node_key(lower, &lower_key, 0);
+ btrfs_set_node_key(c, &lower_key, 0);
+ btrfs_set_node_blockptr(c, 0, extent_buffer_blocknr(lower));
- btrfs_mark_buffer_dirty(t);
+ btrfs_mark_buffer_dirty(c);
/* the super has an extra ref to root->node */
- btrfs_block_release(root, root->node);
- root->node = t;
- get_bh(t);
- path->nodes[level] = t;
+ free_extent_buffer(root->node);
+ root->node = c;
+ extent_buffer_get(c);
+ path->nodes[level] = c;
path->slots[level] = 0;
return 0;
}
*root, struct btrfs_path *path, struct btrfs_disk_key
*key, u64 blocknr, int slot, int level)
{
- struct btrfs_node *lower;
+ struct extent_buffer *lower;
int nritems;
BUG_ON(!path->nodes[level]);
- lower = btrfs_buffer_node(path->nodes[level]);
- nritems = btrfs_header_nritems(&lower->header);
+ lower = path->nodes[level];
+ nritems = btrfs_header_nritems(lower);
if (slot > nritems)
BUG();
if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root))
BUG();
if (slot != nritems) {
- btrfs_memmove(root, lower, lower->ptrs + slot + 1,
- lower->ptrs + slot,
+ memmove_extent_buffer(lower,
+ btrfs_node_key_ptr_offset(slot + 1),
+ btrfs_node_key_ptr_offset(slot),
(nritems - slot) * sizeof(struct btrfs_key_ptr));
}
- btrfs_memcpy(root, lower, &lower->ptrs[slot].key,
- key, sizeof(struct btrfs_disk_key));
+ btrfs_set_node_key(lower, key, slot);
btrfs_set_node_blockptr(lower, slot, blocknr);
- btrfs_set_header_nritems(&lower->header, nritems + 1);
- btrfs_mark_buffer_dirty(path->nodes[level]);
+ btrfs_set_header_nritems(lower, nritems + 1);
+ btrfs_mark_buffer_dirty(lower);
+ check_node(root, path, level);
return 0;
}
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level)
{
- struct buffer_head *t;
- struct btrfs_node *c;
- struct buffer_head *split_buffer;
- struct btrfs_node *split;
+ struct extent_buffer *c;
+ struct extent_buffer *split;
+ struct btrfs_disk_key disk_key;
int mid;
int ret;
int wret;
u32 c_nritems;
- t = path->nodes[level];
- c = btrfs_buffer_node(t);
- if (t == root->node) {
+ c = path->nodes[level];
+ if (c == root->node) {
/* trying to split the root, lets make a new one */
ret = insert_new_root(trans, root, path, level + 1);
if (ret)
return ret;
+ } else {
+ ret = push_nodes_for_insert(trans, root, path, level);
+ c = path->nodes[level];
+ if (!ret && btrfs_header_nritems(c) <
+ BTRFS_NODEPTRS_PER_BLOCK(root) - 1)
+ return 0;
+ if (ret < 0)
+ return ret;
}
- c_nritems = btrfs_header_nritems(&c->header);
- split_buffer = btrfs_alloc_free_block(trans, root);
- split = btrfs_buffer_node(split_buffer);
- btrfs_set_header_flags(&split->header, btrfs_header_flags(&c->header));
- btrfs_set_header_level(&split->header, btrfs_header_level(&c->header));
- btrfs_set_header_blocknr(&split->header, split_buffer->b_blocknr);
- btrfs_set_header_generation(&split->header, trans->transid);
- btrfs_set_header_parentid(&split->header,
- btrfs_header_parentid(btrfs_buffer_header(root->node)));
+
+ c_nritems = btrfs_header_nritems(c);
+ split = btrfs_alloc_free_block(trans, root,
+ extent_buffer_blocknr(c), 0);
+ if (IS_ERR(split))
+ return PTR_ERR(split);
+
+ btrfs_set_header_flags(split, btrfs_header_flags(c));
+ btrfs_set_header_level(split, btrfs_header_level(c));
+ btrfs_set_header_blocknr(split, extent_buffer_blocknr(split));
+ btrfs_set_header_generation(split, trans->transid);
+ btrfs_set_header_owner(split, root->root_key.objectid);
+ write_extent_buffer(split, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(split),
+ BTRFS_FSID_SIZE);
+
mid = (c_nritems + 1) / 2;
- btrfs_memcpy(root, split, split->ptrs, c->ptrs + mid,
- (c_nritems - mid) * sizeof(struct btrfs_key_ptr));
- btrfs_set_header_nritems(&split->header, c_nritems - mid);
- btrfs_set_header_nritems(&c->header, mid);
+
+ copy_extent_buffer(split, c,
+ btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(mid),
+ (c_nritems - mid) * sizeof(struct btrfs_key_ptr));
+ btrfs_set_header_nritems(split, c_nritems - mid);
+ btrfs_set_header_nritems(c, mid);
ret = 0;
- btrfs_mark_buffer_dirty(t);
- btrfs_mark_buffer_dirty(split_buffer);
- wret = insert_ptr(trans, root, path, &split->ptrs[0].key,
- split_buffer->b_blocknr, path->slots[level + 1] + 1,
+ btrfs_mark_buffer_dirty(c);
+ btrfs_mark_buffer_dirty(split);
+
+ btrfs_node_key(split, &disk_key, 0);
+ wret = insert_ptr(trans, root, path, &disk_key,
+ extent_buffer_blocknr(split),
+ path->slots[level + 1] + 1,
level + 1);
if (wret)
ret = wret;
if (path->slots[level] >= mid) {
path->slots[level] -= mid;
- btrfs_block_release(root, t);
- path->nodes[level] = split_buffer;
+ free_extent_buffer(c);
+ path->nodes[level] = split;
path->slots[level + 1] += 1;
} else {
- btrfs_block_release(root, split_buffer);
+ free_extent_buffer(split);
}
return ret;
}
* and nr indicate which items in the leaf to check. This totals up the
* space used both by the item structs and the item data
*/
-static int leaf_space_used(struct btrfs_leaf *l, int start, int nr)
+static int leaf_space_used(struct extent_buffer *l, int start, int nr)
{
int data_len;
- int end = start + nr - 1;
+ int nritems = btrfs_header_nritems(l);
+ int end = min(nritems, start + nr) - 1;
if (!nr)
return 0;
- data_len = btrfs_item_end(l->items + start);
- data_len = data_len - btrfs_item_offset(l->items + end);
+ data_len = btrfs_item_end_nr(l, start);
+ data_len = data_len - btrfs_item_offset_nr(l, end);
data_len += sizeof(struct btrfs_item) * nr;
+ WARN_ON(data_len < 0);
return data_len;
}
+/*
+ * The space between the end of the leaf items and
+ * the start of the leaf data. IOW, how much room
+ * the leaf has left for both items and data
+ */
+int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf)
+{
+ int nritems = btrfs_header_nritems(leaf);
+ int ret;
+ ret = BTRFS_LEAF_DATA_SIZE(root) - leaf_space_used(leaf, 0, nritems);
+ if (ret < 0) {
+ printk("leaf free space ret %d, leaf data size %lu, used %d nritems %d\n",
+ ret, BTRFS_LEAF_DATA_SIZE(root),
+ leaf_space_used(leaf, 0, nritems), nritems);
+ }
+ return ret;
+}
+
/*
* push some data in the path leaf to the right, trying to free up at
* least data_size bytes. returns zero if the push worked, nonzero otherwise
static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int data_size)
{
- struct buffer_head *left_buf = path->nodes[0];
- struct btrfs_leaf *left = btrfs_buffer_leaf(left_buf);
- struct btrfs_leaf *right;
- struct buffer_head *right_buf;
- struct buffer_head *upper;
- struct btrfs_node *upper_node;
+ struct extent_buffer *left = path->nodes[0];
+ struct extent_buffer *right;
+ struct extent_buffer *upper;
+ struct btrfs_disk_key disk_key;
int slot;
int i;
int free_space;
struct btrfs_item *item;
u32 left_nritems;
u32 right_nritems;
+ u32 data_end;
+ int ret;
slot = path->slots[1];
if (!path->nodes[1]) {
return 1;
}
upper = path->nodes[1];
- upper_node = btrfs_buffer_node(upper);
- if (slot >= btrfs_header_nritems(&upper_node->header) - 1) {
+ if (slot >= btrfs_header_nritems(upper) - 1)
return 1;
- }
- right_buf = read_tree_block(root,
- btrfs_node_blockptr(btrfs_buffer_node(upper), slot + 1));
- right = btrfs_buffer_leaf(right_buf);
+
+ right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1));
free_space = btrfs_leaf_free_space(root, right);
if (free_space < data_size + sizeof(struct btrfs_item)) {
- btrfs_block_release(root, right_buf);
+ free_extent_buffer(right);
return 1;
}
+
/* cow and double check */
- btrfs_cow_block(trans, root, right_buf, upper, slot + 1, &right_buf);
- right = btrfs_buffer_leaf(right_buf);
+ ret = btrfs_cow_block(trans, root, right, upper,
+ slot + 1, &right);
+ if (ret) {
+ free_extent_buffer(right);
+ return 1;
+ }
free_space = btrfs_leaf_free_space(root, right);
if (free_space < data_size + sizeof(struct btrfs_item)) {
- btrfs_block_release(root, right_buf);
+ free_extent_buffer(right);
return 1;
}
- left_nritems = btrfs_header_nritems(&left->header);
- for (i = left_nritems - 1; i >= 0; i--) {
- item = left->items + i;
+ left_nritems = btrfs_header_nritems(left);
+ if (left_nritems == 0) {
+ free_extent_buffer(right);
+ return 1;
+ }
+
+ for (i = left_nritems - 1; i >= 1; i--) {
+ item = btrfs_item_nr(left, i);
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
- if (btrfs_item_size(item) + sizeof(*item) + push_space >
+ if (btrfs_item_size(left, item) + sizeof(*item) + push_space >
free_space)
break;
push_items++;
- push_space += btrfs_item_size(item) + sizeof(*item);
+ push_space += btrfs_item_size(left, item) + sizeof(*item);
}
+
if (push_items == 0) {
- btrfs_block_release(root, right_buf);
+ free_extent_buffer(right);
return 1;
}
- right_nritems = btrfs_header_nritems(&right->header);
+
+ if (push_items == left_nritems)
+ WARN_ON(1);
+
/* push left to right */
- push_space = btrfs_item_end(left->items + left_nritems - push_items);
+ right_nritems = btrfs_header_nritems(right);
+ push_space = btrfs_item_end_nr(left, left_nritems - push_items);
push_space -= leaf_data_end(root, left);
+
/* make room in the right data area */
- btrfs_memmove(root, right, btrfs_leaf_data(right) +
- leaf_data_end(root, right) - push_space,
- btrfs_leaf_data(right) +
- leaf_data_end(root, right), BTRFS_LEAF_DATA_SIZE(root) -
- leaf_data_end(root, right));
+ data_end = leaf_data_end(root, right);
+ memmove_extent_buffer(right,
+ btrfs_leaf_data(right) + data_end - push_space,
+ btrfs_leaf_data(right) + data_end,
+ BTRFS_LEAF_DATA_SIZE(root) - data_end);
+
/* copy from the left data area */
- btrfs_memcpy(root, right, btrfs_leaf_data(right) +
+ copy_extent_buffer(right, left, btrfs_leaf_data(right) +
BTRFS_LEAF_DATA_SIZE(root) - push_space,
btrfs_leaf_data(left) + leaf_data_end(root, left),
push_space);
- btrfs_memmove(root, right, right->items + push_items, right->items,
- right_nritems * sizeof(struct btrfs_item));
+
+ memmove_extent_buffer(right, btrfs_item_nr_offset(push_items),
+ btrfs_item_nr_offset(0),
+ right_nritems * sizeof(struct btrfs_item));
+
/* copy the items from left to right */
- btrfs_memcpy(root, right, right->items, left->items +
- left_nritems - push_items,
- push_items * sizeof(struct btrfs_item));
+ copy_extent_buffer(right, left, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(left_nritems - push_items),
+ push_items * sizeof(struct btrfs_item));
/* update the item pointers */
right_nritems += push_items;
- btrfs_set_header_nritems(&right->header, right_nritems);
+ btrfs_set_header_nritems(right, right_nritems);
push_space = BTRFS_LEAF_DATA_SIZE(root);
for (i = 0; i < right_nritems; i++) {
- btrfs_set_item_offset(right->items + i, push_space -
- btrfs_item_size(right->items + i));
- push_space = btrfs_item_offset(right->items + i);
+ item = btrfs_item_nr(right, i);
+ btrfs_set_item_offset(right, item, push_space -
+ btrfs_item_size(right, item));
+ push_space = btrfs_item_offset(right, item);
}
left_nritems -= push_items;
- btrfs_set_header_nritems(&left->header, left_nritems);
+ btrfs_set_header_nritems(left, left_nritems);
- btrfs_mark_buffer_dirty(left_buf);
- btrfs_mark_buffer_dirty(right_buf);
- btrfs_memcpy(root, upper_node, &upper_node->ptrs[slot + 1].key,
- &right->items[0].key, sizeof(struct btrfs_disk_key));
+ btrfs_mark_buffer_dirty(left);
+ btrfs_mark_buffer_dirty(right);
+
+ btrfs_item_key(right, &disk_key, 0);
+ btrfs_set_node_key(upper, &disk_key, slot + 1);
btrfs_mark_buffer_dirty(upper);
/* then fixup the leaf pointer in the path */
if (path->slots[0] >= left_nritems) {
path->slots[0] -= left_nritems;
- btrfs_block_release(root, path->nodes[0]);
- path->nodes[0] = right_buf;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
path->slots[1] += 1;
} else {
- btrfs_block_release(root, right_buf);
+ free_extent_buffer(right);
}
+ if (path->nodes[1])
+ check_node(root, path, 1);
return 0;
}
/*
static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int data_size)
{
- struct buffer_head *right_buf = path->nodes[0];
- struct btrfs_leaf *right = btrfs_buffer_leaf(right_buf);
- struct buffer_head *t;
- struct btrfs_leaf *left;
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *right = path->nodes[0];
+ struct extent_buffer *left;
int slot;
int i;
int free_space;
int push_items = 0;
struct btrfs_item *item;
u32 old_left_nritems;
+ u32 right_nritems;
int ret = 0;
int wret;
slot = path->slots[1];
- if (slot == 0) {
+ if (slot == 0)
return 1;
- }
- if (!path->nodes[1]) {
+ if (!path->nodes[1])
return 1;
- }
- t = read_tree_block(root,
- btrfs_node_blockptr(btrfs_buffer_node(path->nodes[1]), slot - 1));
- left = btrfs_buffer_leaf(t);
+
+ left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1],
+ slot - 1));
free_space = btrfs_leaf_free_space(root, left);
if (free_space < data_size + sizeof(struct btrfs_item)) {
- btrfs_block_release(root, t);
+ free_extent_buffer(left);
return 1;
}
/* cow and double check */
- btrfs_cow_block(trans, root, t, path->nodes[1], slot - 1, &t);
- left = btrfs_buffer_leaf(t);
+ ret = btrfs_cow_block(trans, root, left,
+ path->nodes[1], slot - 1, &left);
+ if (ret) {
+ /* we hit -ENOSPC, but it isn't fatal here */
+ free_extent_buffer(left);
+ return 1;
+ }
free_space = btrfs_leaf_free_space(root, left);
if (free_space < data_size + sizeof(struct btrfs_item)) {
- btrfs_block_release(root, t);
+ free_extent_buffer(left);
return 1;
}
- for (i = 0; i < btrfs_header_nritems(&right->header); i++) {
- item = right->items + i;
+ right_nritems = btrfs_header_nritems(right);
+ if (right_nritems == 0) {
+ free_extent_buffer(left);
+ return 1;
+ }
+
+ for (i = 0; i < right_nritems - 1; i++) {
+ item = btrfs_item_nr(right, i);
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
- if (btrfs_item_size(item) + sizeof(*item) + push_space >
+ if (btrfs_item_size(right, item) + sizeof(*item) + push_space >
free_space)
break;
push_items++;
- push_space += btrfs_item_size(item) + sizeof(*item);
+ push_space += btrfs_item_size(right, item) + sizeof(*item);
}
if (push_items == 0) {
- btrfs_block_release(root, t);
+ free_extent_buffer(left);
return 1;
}
+ if (push_items == btrfs_header_nritems(right))
+ WARN_ON(1);
+
/* push data from right to left */
- btrfs_memcpy(root, left, left->items +
- btrfs_header_nritems(&left->header),
- right->items, push_items * sizeof(struct btrfs_item));
+ copy_extent_buffer(left, right,
+ btrfs_item_nr_offset(btrfs_header_nritems(left)),
+ btrfs_item_nr_offset(0),
+ push_items * sizeof(struct btrfs_item));
+
push_space = BTRFS_LEAF_DATA_SIZE(root) -
- btrfs_item_offset(right->items + push_items -1);
- btrfs_memcpy(root, left, btrfs_leaf_data(left) +
+ btrfs_item_offset_nr(right, push_items -1);
+
+ copy_extent_buffer(left, right, btrfs_leaf_data(left) +
leaf_data_end(root, left) - push_space,
btrfs_leaf_data(right) +
- btrfs_item_offset(right->items + push_items - 1),
+ btrfs_item_offset_nr(right, push_items - 1),
push_space);
- old_left_nritems = btrfs_header_nritems(&left->header);
+ old_left_nritems = btrfs_header_nritems(left);
BUG_ON(old_left_nritems < 0);
for (i = old_left_nritems; i < old_left_nritems + push_items; i++) {
- u32 ioff = btrfs_item_offset(left->items + i);
- btrfs_set_item_offset(left->items + i, ioff -
- (BTRFS_LEAF_DATA_SIZE(root) -
- btrfs_item_offset(left->items +
- old_left_nritems - 1)));
+ u32 ioff;
+ item = btrfs_item_nr(left, i);
+ ioff = btrfs_item_offset(left, item);
+ btrfs_set_item_offset(left, item,
+ ioff - (BTRFS_LEAF_DATA_SIZE(root) -
+ btrfs_item_offset_nr(left, old_left_nritems - 1)));
}
- btrfs_set_header_nritems(&left->header, old_left_nritems + push_items);
+ btrfs_set_header_nritems(left, old_left_nritems + push_items);
/* fixup right node */
- push_space = btrfs_item_offset(right->items + push_items - 1) -
- leaf_data_end(root, right);
- btrfs_memmove(root, right, btrfs_leaf_data(right) +
- BTRFS_LEAF_DATA_SIZE(root) - push_space,
- btrfs_leaf_data(right) +
- leaf_data_end(root, right), push_space);
- btrfs_memmove(root, right, right->items, right->items + push_items,
- (btrfs_header_nritems(&right->header) - push_items) *
- sizeof(struct btrfs_item));
- btrfs_set_header_nritems(&right->header,
- btrfs_header_nritems(&right->header) -
- push_items);
+ push_space = btrfs_item_offset_nr(right, push_items - 1) -
+ leaf_data_end(root, right);
+ memmove_extent_buffer(right, btrfs_leaf_data(right) +
+ BTRFS_LEAF_DATA_SIZE(root) - push_space,
+ btrfs_leaf_data(right) +
+ leaf_data_end(root, right), push_space);
+
+ memmove_extent_buffer(right, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(push_items),
+ (btrfs_header_nritems(right) - push_items) *
+ sizeof(struct btrfs_item));
+
+ right_nritems = btrfs_header_nritems(right) - push_items;
+ btrfs_set_header_nritems(right, right_nritems);
push_space = BTRFS_LEAF_DATA_SIZE(root);
- for (i = 0; i < btrfs_header_nritems(&right->header); i++) {
- btrfs_set_item_offset(right->items + i, push_space -
- btrfs_item_size(right->items + i));
- push_space = btrfs_item_offset(right->items + i);
+ for (i = 0; i < right_nritems; i++) {
+ item = btrfs_item_nr(right, i);
+ btrfs_set_item_offset(right, item, push_space -
+ btrfs_item_size(right, item));
+ push_space = btrfs_item_offset(right, item);
}
- btrfs_mark_buffer_dirty(t);
- btrfs_mark_buffer_dirty(right_buf);
+ btrfs_mark_buffer_dirty(left);
+ btrfs_mark_buffer_dirty(right);
- wret = fixup_low_keys(trans, root, path, &right->items[0].key, 1);
+ btrfs_item_key(right, &disk_key, 0);
+ wret = fixup_low_keys(trans, root, path, &disk_key, 1);
if (wret)
ret = wret;
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
path->slots[0] += old_left_nritems;
- btrfs_block_release(root, path->nodes[0]);
- path->nodes[0] = t;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = left;
path->slots[1] -= 1;
} else {
- btrfs_block_release(root, t);
+ free_extent_buffer(left);
path->slots[0] -= push_items;
}
BUG_ON(path->slots[0] < 0);
+ if (path->nodes[1])
+ check_node(root, path, 1);
return ret;
}
* returns 0 if all went well and < 0 on failure.
*/
static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size)
+ *root, struct btrfs_key *ins_key,
+ struct btrfs_path *path, int data_size)
{
- struct buffer_head *l_buf;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
u32 nritems;
int mid;
int slot;
- struct btrfs_leaf *right;
- struct buffer_head *right_buffer;
+ struct extent_buffer *right;
int space_needed = data_size + sizeof(struct btrfs_item);
int data_copy_size;
int rt_data_off;
int i;
- int ret;
+ int ret = 0;
int wret;
+ int double_split = 0;
+ struct btrfs_disk_key disk_key;
/* first try to make some room by pushing left and right */
wret = push_leaf_left(trans, root, path, data_size);
if (wret < 0)
return wret;
}
- l_buf = path->nodes[0];
- l = btrfs_buffer_leaf(l_buf);
+ l = path->nodes[0];
/* did the pushes work? */
if (btrfs_leaf_free_space(root, l) >=
return ret;
}
slot = path->slots[0];
- nritems = btrfs_header_nritems(&l->header);
+ nritems = btrfs_header_nritems(l);
mid = (nritems + 1)/ 2;
- right_buffer = btrfs_alloc_free_block(trans, root);
- BUG_ON(!right_buffer);
- BUG_ON(mid == nritems);
- right = btrfs_buffer_leaf(right_buffer);
- memset(&right->header, 0, sizeof(right->header));
+
+ right = btrfs_alloc_free_block(trans, root,
+ extent_buffer_blocknr(l), 0);
+ if (IS_ERR(right))
+ return PTR_ERR(right);
+
+ memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_blocknr(right, extent_buffer_blocknr(right));
+ btrfs_set_header_generation(right, trans->transid);
+ btrfs_set_header_owner(right, root->root_key.objectid);
+ btrfs_set_header_level(right, 0);
+ write_extent_buffer(right, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(right),
+ BTRFS_FSID_SIZE);
+
if (mid <= slot) {
- /* FIXME, just alloc a new leaf here */
- if (leaf_space_used(l, mid, nritems - mid) + space_needed >
- BTRFS_LEAF_DATA_SIZE(root))
- BUG();
+ if (nritems == 1 ||
+ leaf_space_used(l, mid, nritems - mid) + space_needed >
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (slot >= nritems) {
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ extent_buffer_blocknr(right),
+ path->slots[1] + 1, 1);
+ if (wret)
+ ret = wret;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ path->slots[1] += 1;
+ return ret;
+ }
+ mid = slot;
+ double_split = 1;
+ }
} else {
- /* FIXME, just alloc a new leaf here */
if (leaf_space_used(l, 0, mid + 1) + space_needed >
- BTRFS_LEAF_DATA_SIZE(root))
- BUG();
- }
- btrfs_set_header_nritems(&right->header, nritems - mid);
- btrfs_set_header_blocknr(&right->header, right_buffer->b_blocknr);
- btrfs_set_header_generation(&right->header, trans->transid);
- btrfs_set_header_level(&right->header, 0);
- btrfs_set_header_parentid(&right->header,
- btrfs_header_parentid(btrfs_buffer_header(root->node)));
- data_copy_size = btrfs_item_end(l->items + mid) -
- leaf_data_end(root, l);
- btrfs_memcpy(root, right, right->items, l->items + mid,
- (nritems - mid) * sizeof(struct btrfs_item));
- btrfs_memcpy(root, right,
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (slot == 0) {
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ extent_buffer_blocknr(right),
+ path->slots[1], 1);
+ if (wret)
+ ret = wret;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ if (path->slots[1] == 0) {
+ wret = fixup_low_keys(trans, root,
+ path, &disk_key, 1);
+ if (wret)
+ ret = wret;
+ }
+ return ret;
+ }
+ mid = slot;
+ double_split = 1;
+ }
+ }
+ nritems = nritems - mid;
+ btrfs_set_header_nritems(right, nritems);
+ data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
+
+ copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(mid),
+ nritems * sizeof(struct btrfs_item));
+
+ copy_extent_buffer(right, l,
btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) -
data_copy_size, btrfs_leaf_data(l) +
leaf_data_end(root, l), data_copy_size);
+
rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
- btrfs_item_end(l->items + mid);
+ btrfs_item_end_nr(l, mid);
- for (i = 0; i < btrfs_header_nritems(&right->header); i++) {
- u32 ioff = btrfs_item_offset(right->items + i);
- btrfs_set_item_offset(right->items + i, ioff + rt_data_off);
+ for (i = 0; i < nritems; i++) {
+ struct btrfs_item *item = btrfs_item_nr(right, i);
+ u32 ioff = btrfs_item_offset(right, item);
+ btrfs_set_item_offset(right, item, ioff + rt_data_off);
}
- btrfs_set_header_nritems(&l->header, mid);
+ btrfs_set_header_nritems(l, mid);
ret = 0;
- wret = insert_ptr(trans, root, path, &right->items[0].key,
- right_buffer->b_blocknr, path->slots[1] + 1, 1);
+ btrfs_item_key(right, &disk_key, 0);
+ wret = insert_ptr(trans, root, path, &disk_key,
+ extent_buffer_blocknr(right), path->slots[1] + 1, 1);
if (wret)
ret = wret;
- btrfs_mark_buffer_dirty(right_buffer);
- btrfs_mark_buffer_dirty(l_buf);
+
+ btrfs_mark_buffer_dirty(right);
+ btrfs_mark_buffer_dirty(l);
BUG_ON(path->slots[0] != slot);
+
if (mid <= slot) {
- btrfs_block_release(root, path->nodes[0]);
- path->nodes[0] = right_buffer;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
path->slots[0] -= mid;
path->slots[1] += 1;
} else
- btrfs_block_release(root, right_buffer);
+ free_extent_buffer(right);
+
BUG_ON(path->slots[0] < 0);
+ check_node(root, path, 1);
+ check_leaf(root, path, 0);
+
+ if (!double_split)
+ return ret;
+
+ right = btrfs_alloc_free_block(trans, root,
+ extent_buffer_blocknr(l), 0);
+ if (IS_ERR(right))
+ return PTR_ERR(right);
+
+ memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_blocknr(right, extent_buffer_blocknr(right));
+ btrfs_set_header_generation(right, trans->transid);
+ btrfs_set_header_owner(right, root->root_key.objectid);
+ btrfs_set_header_level(right, 0);
+ write_extent_buffer(right, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(right),
+ BTRFS_FSID_SIZE);
+
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ extent_buffer_blocknr(right),
+ path->slots[1], 1);
+ if (wret)
+ ret = wret;
+ if (path->slots[1] == 0) {
+ wret = fixup_low_keys(trans, root, path, &disk_key, 1);
+ if (wret)
+ ret = wret;
+ }
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ check_node(root, path, 1);
+ check_leaf(root, path, 0);
+ return ret;
+}
+
+int btrfs_truncate_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ u32 new_size)
+{
+ int ret = 0;
+ int slot;
+ int slot_orig;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ u32 nritems;
+ unsigned int data_end;
+ unsigned int old_data_start;
+ unsigned int old_size;
+ unsigned int size_diff;
+ int i;
+
+ slot_orig = path->slots[0];
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
+
+ slot = path->slots[0];
+ old_data_start = btrfs_item_offset_nr(leaf, slot);
+ old_size = btrfs_item_size_nr(leaf, slot);
+ BUG_ON(old_size <= new_size);
+ size_diff = old_size - new_size;
+
+ BUG_ON(slot < 0);
+ BUG_ON(slot >= nritems);
+
+ /*
+ * item0..itemN ... dataN.offset..dataN.size .. data0.size
+ */
+ /* first correct the data pointers */
+ for (i = slot; i < nritems; i++) {
+ u32 ioff;
+ item = btrfs_item_nr(leaf, i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + size_diff);
+ }
+ /* shift the data */
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end + size_diff, btrfs_leaf_data(leaf) +
+ data_end, old_data_start + new_size - data_end);
+
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_set_item_size(leaf, item, new_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ check_leaf(root, path, 0);
+ return ret;
+}
+
+int btrfs_extend_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ u32 data_size)
+{
+ int ret = 0;
+ int slot;
+ int slot_orig;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ u32 nritems;
+ unsigned int data_end;
+ unsigned int old_data;
+ unsigned int old_size;
+ int i;
+
+ slot_orig = path->slots[0];
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
+
+ if (btrfs_leaf_free_space(root, leaf) < data_size) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ slot = path->slots[0];
+ old_data = btrfs_item_end_nr(leaf, slot);
+
+ BUG_ON(slot < 0);
+ BUG_ON(slot >= nritems);
+
+ /*
+ * item0..itemN ... dataN.offset..dataN.size .. data0.size
+ */
+ /* first correct the data pointers */
+ for (i = slot; i < nritems; i++) {
+ u32 ioff;
+ item = btrfs_item_nr(leaf, i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff - data_size);
+ }
+
+ /* shift the data */
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end - data_size, btrfs_leaf_data(leaf) +
+ data_end, old_data - data_end);
+
+ data_end = old_data;
+ old_size = btrfs_item_size_nr(leaf, slot);
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_set_item_size(leaf, item, old_size + data_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ check_leaf(root, path, 0);
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_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, struct btrfs_key
- *cpu_key, u32 data_size)
+int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *cpu_key, u32 data_size)
{
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
int ret = 0;
int slot;
int slot_orig;
- struct btrfs_leaf *leaf;
- struct buffer_head *leaf_buf;
u32 nritems;
unsigned int data_end;
struct btrfs_disk_key disk_key;
/* create a root if there isn't one */
if (!root->node)
BUG();
+
ret = btrfs_search_slot(trans, root, cpu_key, path, data_size, 1);
if (ret == 0) {
return -EEXIST;
goto out;
slot_orig = path->slots[0];
- leaf_buf = path->nodes[0];
- leaf = btrfs_buffer_leaf(leaf_buf);
+ leaf = path->nodes[0];
- nritems = btrfs_header_nritems(&leaf->header);
+ nritems = btrfs_header_nritems(leaf);
data_end = leaf_data_end(root, leaf);
if (btrfs_leaf_free_space(root, leaf) <
- sizeof(struct btrfs_item) + data_size)
+ sizeof(struct btrfs_item) + data_size) {
BUG();
+ }
slot = path->slots[0];
BUG_ON(slot < 0);
+
if (slot != nritems) {
int i;
- unsigned int old_data = btrfs_item_end(leaf->items + slot);
+ unsigned int old_data = btrfs_item_end_nr(leaf, slot);
+ if (old_data < data_end) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d old_data %d data_end %d\n",
+ slot, old_data, data_end);
+ BUG_ON(1);
+ }
/*
* item0..itemN ... dataN.offset..dataN.size .. data0.size
*/
/* first correct the data pointers */
for (i = slot; i < nritems; i++) {
- u32 ioff = btrfs_item_offset(leaf->items + i);
- btrfs_set_item_offset(leaf->items + i,
- ioff - data_size);
+ u32 ioff;
+ item = btrfs_item_nr(leaf, i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff - data_size);
}
/* shift the items */
- btrfs_memmove(root, leaf, leaf->items + slot + 1,
- leaf->items + slot,
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + 1),
+ btrfs_item_nr_offset(slot),
(nritems - slot) * sizeof(struct btrfs_item));
/* shift the data */
- btrfs_memmove(root, leaf, btrfs_leaf_data(leaf) +
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
data_end - data_size, btrfs_leaf_data(leaf) +
data_end, old_data - data_end);
data_end = old_data;
}
+
/* setup the item for the new data */
- btrfs_memcpy(root, leaf, &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);
- btrfs_set_header_nritems(&leaf->header, nritems + 1);
- btrfs_mark_buffer_dirty(leaf_buf);
+ btrfs_set_item_key(leaf, &disk_key, slot);
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_set_item_offset(leaf, item, data_end - data_size);
+ btrfs_set_item_size(leaf, item, data_size);
+ btrfs_set_header_nritems(leaf, nritems + 1);
+ btrfs_mark_buffer_dirty(leaf);
ret = 0;
if (slot == 0)
ret = fixup_low_keys(trans, root, path, &disk_key, 1);
- if (btrfs_leaf_free_space(root, leaf) < 0)
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
BUG();
+ }
check_leaf(root, path, 0);
out:
return ret;
data_size)
{
int ret = 0;
- struct btrfs_path path;
- u8 *ptr;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ unsigned long ptr;
- btrfs_init_path(&path);
- ret = btrfs_insert_empty_item(trans, root, &path, cpu_key, data_size);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
if (!ret) {
- ptr = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
- path.slots[0], u8);
- btrfs_memcpy(root, path.nodes[0]->b_data,
- ptr, data, data_size);
- btrfs_mark_buffer_dirty(path.nodes[0]);
+ leaf = path->nodes[0];
+ ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
+ write_extent_buffer(leaf, data, ptr, data_size);
+ btrfs_mark_buffer_dirty(leaf);
}
- btrfs_release_path(root, &path);
+ btrfs_free_path(path);
return ret;
}
static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot)
{
- struct btrfs_node *node;
- struct buffer_head *parent = path->nodes[level];
+ struct extent_buffer *parent = path->nodes[level];
u32 nritems;
int ret = 0;
int wret;
- node = btrfs_buffer_node(parent);
- nritems = btrfs_header_nritems(&node->header);
+ nritems = btrfs_header_nritems(parent);
if (slot != nritems -1) {
- btrfs_memmove(root, node, node->ptrs + slot,
- node->ptrs + slot + 1,
+ memmove_extent_buffer(parent,
+ btrfs_node_key_ptr_offset(slot),
+ btrfs_node_key_ptr_offset(slot + 1),
sizeof(struct btrfs_key_ptr) *
(nritems - slot - 1));
}
nritems--;
- btrfs_set_header_nritems(&node->header, nritems);
+ btrfs_set_header_nritems(parent, nritems);
if (nritems == 0 && parent == root->node) {
- struct btrfs_header *header = btrfs_buffer_header(root->node);
- BUG_ON(btrfs_header_level(header) != 1);
+ BUG_ON(btrfs_header_level(root->node) != 1);
/* just turn the root into a leaf and break */
- btrfs_set_header_level(header, 0);
+ btrfs_set_header_level(root->node, 0);
} else if (slot == 0) {
- wret = fixup_low_keys(trans, root, path, &node->ptrs[0].key,
- level + 1);
+ struct btrfs_disk_key disk_key;
+
+ btrfs_node_key(parent, &disk_key, 0);
+ wret = fixup_low_keys(trans, root, path, &disk_key, level + 1);
if (wret)
ret = wret;
}
struct btrfs_path *path)
{
int slot;
- struct btrfs_leaf *leaf;
- struct buffer_head *leaf_buf;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
int doff;
int dsize;
int ret = 0;
int wret;
u32 nritems;
- leaf_buf = path->nodes[0];
- leaf = btrfs_buffer_leaf(leaf_buf);
+ leaf = path->nodes[0];
slot = path->slots[0];
- doff = btrfs_item_offset(leaf->items + slot);
- dsize = btrfs_item_size(leaf->items + slot);
- nritems = btrfs_header_nritems(&leaf->header);
+ doff = btrfs_item_offset_nr(leaf, slot);
+ dsize = btrfs_item_size_nr(leaf, slot);
+ nritems = btrfs_header_nritems(leaf);
if (slot != nritems - 1) {
int i;
int data_end = leaf_data_end(root, leaf);
- btrfs_memmove(root, leaf, btrfs_leaf_data(leaf) +
+
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
data_end + dsize,
btrfs_leaf_data(leaf) + data_end,
doff - data_end);
+
for (i = slot + 1; i < nritems; i++) {
- u32 ioff = btrfs_item_offset(leaf->items + i);
- btrfs_set_item_offset(leaf->items + i, ioff + dsize);
+ u32 ioff;
+ item = btrfs_item_nr(leaf, i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + dsize);
}
- btrfs_memmove(root, leaf, leaf->items + slot,
- leaf->items + slot + 1,
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot),
+ btrfs_item_nr_offset(slot + 1),
sizeof(struct btrfs_item) *
(nritems - slot - 1));
}
- btrfs_set_header_nritems(&leaf->header, nritems - 1);
+ btrfs_set_header_nritems(leaf, nritems - 1);
nritems--;
+
/* delete the leaf if we've emptied it */
if (nritems == 0) {
- if (leaf_buf == root->node) {
- btrfs_set_header_level(&leaf->header, 0);
+ if (leaf == root->node) {
+ btrfs_set_header_level(leaf, 0);
} else {
- clean_tree_block(trans, root, leaf_buf);
- wait_on_buffer(leaf_buf);
+ clean_tree_block(trans, root, leaf);
+ wait_on_tree_block_writeback(root, leaf);
wret = del_ptr(trans, root, path, 1, path->slots[1]);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root,
- leaf_buf->b_blocknr, 1, 1);
+ extent_buffer_blocknr(leaf),
+ 1, 1);
if (wret)
ret = wret;
}
} else {
int used = leaf_space_used(leaf, 0, nritems);
if (slot == 0) {
+ struct btrfs_disk_key disk_key;
+
+ btrfs_item_key(leaf, &disk_key, 0);
wret = fixup_low_keys(trans, root, path,
- &leaf->items[0].key, 1);
+ &disk_key, 1);
if (wret)
ret = wret;
}
* for possible call to del_ptr below
*/
slot = path->slots[1];
- get_bh(leaf_buf);
+ extent_buffer_get(leaf);
+
wret = push_leaf_left(trans, root, path, 1);
- if (wret < 0)
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
- if (path->nodes[0] == leaf_buf &&
- btrfs_header_nritems(&leaf->header)) {
+
+ if (path->nodes[0] == leaf &&
+ btrfs_header_nritems(leaf)) {
wret = push_leaf_right(trans, root, path, 1);
- if (wret < 0)
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
}
- if (btrfs_header_nritems(&leaf->header) == 0) {
- u64 blocknr = leaf_buf->b_blocknr;
- clean_tree_block(trans, root, leaf_buf);
- wait_on_buffer(leaf_buf);
+
+ if (btrfs_header_nritems(leaf) == 0) {
+ u64 blocknr = extent_buffer_blocknr(leaf);
+
+ clean_tree_block(trans, root, leaf);
+ wait_on_tree_block_writeback(root, leaf);
+
wret = del_ptr(trans, root, path, 1, slot);
if (wret)
ret = wret;
- btrfs_block_release(root, leaf_buf);
+
+ free_extent_buffer(leaf);
wret = btrfs_free_extent(trans, root, blocknr,
1, 1);
if (wret)
ret = wret;
} else {
- btrfs_mark_buffer_dirty(leaf_buf);
- btrfs_block_release(root, leaf_buf);
+ btrfs_mark_buffer_dirty(leaf);
+ free_extent_buffer(leaf);
}
} else {
- btrfs_mark_buffer_dirty(leaf_buf);
+ btrfs_mark_buffer_dirty(leaf);
}
}
return ret;
int slot;
int level = 1;
u64 blocknr;
- struct buffer_head *c;
- struct btrfs_node *c_node;
- struct buffer_head *next = NULL;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
return 1;
+
slot = path->slots[level] + 1;
c = path->nodes[level];
- c_node = btrfs_buffer_node(c);
- if (slot >= btrfs_header_nritems(&c_node->header)) {
+ if (slot >= btrfs_header_nritems(c)) {
level++;
continue;
}
- blocknr = btrfs_node_blockptr(c_node, slot);
+
+ blocknr = btrfs_node_blockptr(c, slot);
if (next)
- btrfs_block_release(root, next);
+ free_extent_buffer(next);
+
+ if (path->reada)
+ reada_for_search(root, path, level, slot);
+
next = read_tree_block(root, blocknr);
break;
}
while(1) {
level--;
c = path->nodes[level];
- btrfs_block_release(root, c);
+ free_extent_buffer(c);
path->nodes[level] = next;
path->slots[level] = 0;
if (!level)
break;
- next = read_tree_block(root,
- btrfs_node_blockptr(btrfs_buffer_node(next), 0));
+ if (path->reada)
+ reada_for_search(root, path, level, 0);
+ next = read_tree_block(root, btrfs_node_blockptr(next, 0));
}
return 0;
}
projects / linux-2.6-block.git / blobdiff