-#include <stdio.h>
-#include <stdlib.h>
-#include "kerncompat.h"
-#include "radix-tree.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 "ctree.h"
#include "disk-io.h"
+#include "transaction.h"
#include "print-tree.h"
-
-static int split_node(struct ctree_root *root, struct ctree_path *path,
- int level);
-static int split_leaf(struct ctree_root *root, struct ctree_path *path,
- int data_size);
-static int push_node_left(struct ctree_root *root, struct tree_buffer *dst,
- struct tree_buffer *src);
-static int balance_node_right(struct ctree_root *root,
- struct tree_buffer *dst_buf,
- struct tree_buffer *src_buf);
-static int del_ptr(struct ctree_root *root, struct ctree_path *path, int level,
- int slot);
-
-inline void init_path(struct ctree_path *p)
+#include "repair.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_key *ins_key,
+ struct btrfs_path *path, int data_size, int extend);
+static int push_node_left(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *dst,
+ struct extent_buffer *src, int empty);
+static int balance_node_right(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *dst_buf,
+ struct extent_buffer *src_buf);
+
+inline void btrfs_init_path(struct btrfs_path *p)
{
memset(p, 0, sizeof(*p));
}
-void release_path(struct ctree_root *root, struct ctree_path *p)
+struct btrfs_path *btrfs_alloc_path(void)
+{
+ struct btrfs_path *path;
+ path = kzalloc(sizeof(struct btrfs_path), GFP_NOFS);
+ return path;
+}
+
+void btrfs_free_path(struct btrfs_path *p)
+{
+ if (!p)
+ return;
+ btrfs_release_path(p);
+ kfree(p);
+}
+
+void btrfs_release_path(struct btrfs_path *p)
{
int i;
- for (i = 0; i < MAX_LEVEL; i++) {
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
if (!p->nodes[i])
- break;
- tree_block_release(root, p->nodes[i]);
+ continue;
+ free_extent_buffer(p->nodes[i]);
}
memset(p, 0, sizeof(*p));
}
-int btrfs_cow_block(struct ctree_root *root,
- struct tree_buffer *buf,
- struct tree_buffer *parent,
- int parent_slot,
- struct tree_buffer **cow_ret)
+void add_root_to_dirty_list(struct btrfs_root *root)
+{
+ if (root->track_dirty && list_empty(&root->dirty_list)) {
+ list_add(&root->dirty_list,
+ &root->fs_info->dirty_cowonly_roots);
+ }
+}
+
+int btrfs_copy_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer **cow_ret, u64 new_root_objectid)
{
- struct tree_buffer *cow;
+ struct extent_buffer *cow;
+ int ret = 0;
+ int level;
+ struct btrfs_root *new_root;
+ struct btrfs_disk_key disk_key;
- if (!list_empty(&buf->dirty)) {
- *cow_ret = buf;
- return 0;
+ new_root = kmalloc(sizeof(*new_root), GFP_NOFS);
+ if (!new_root)
+ return -ENOMEM;
+
+ memcpy(new_root, root, sizeof(*new_root));
+ new_root->root_key.objectid = new_root_objectid;
+
+ WARN_ON(root->ref_cows && trans->transid !=
+ root->fs_info->running_transaction->transid);
+ WARN_ON(root->ref_cows && trans->transid != root->last_trans);
+
+ level = btrfs_header_level(buf);
+ if (level == 0)
+ btrfs_item_key(buf, &disk_key, 0);
+ else
+ btrfs_node_key(buf, &disk_key, 0);
+ cow = btrfs_alloc_free_block(trans, new_root, buf->len,
+ new_root_objectid, &disk_key,
+ level, buf->start, 0);
+ if (IS_ERR(cow)) {
+ kfree(new_root);
+ return PTR_ERR(cow);
}
- cow = alloc_free_block(root);
- memcpy(&cow->node, &buf->node, sizeof(buf->node));
- cow->node.header.blocknr = cow->blocknr;
+
+ copy_extent_buffer(cow, buf, 0, 0, cow->len);
+ btrfs_set_header_bytenr(cow, cow->start);
+ btrfs_set_header_generation(cow, trans->transid);
+ btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN |
+ BTRFS_HEADER_FLAG_RELOC);
+ if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+ btrfs_set_header_flag(cow, BTRFS_HEADER_FLAG_RELOC);
+ else
+ btrfs_set_header_owner(cow, new_root_objectid);
+
+ write_extent_buffer(cow, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ WARN_ON(btrfs_header_generation(buf) > trans->transid);
+ ret = btrfs_inc_ref(trans, new_root, cow, 0);
+ kfree(new_root);
+
+ if (ret)
+ return ret;
+
+ btrfs_mark_buffer_dirty(cow);
*cow_ret = cow;
- btrfs_inc_ref(root, buf);
+ return 0;
+}
+
+/*
+ * check if the tree block can be shared by multiple trees
+ */
+static int btrfs_block_can_be_shared(struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ /*
+ * Tree blocks not in refernece counted trees and tree roots
+ * are never shared. If a block was allocated after the last
+ * snapshot and the block was not allocated by tree relocation,
+ * we know the block is not shared.
+ */
+ if (root->ref_cows &&
+ buf != root->node && buf != root->commit_root &&
+ (btrfs_header_generation(buf) <=
+ btrfs_root_last_snapshot(&root->root_item) ||
+ btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)))
+ return 1;
+#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
+ if (root->ref_cows &&
+ btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
+ return 1;
+#endif
+ return 0;
+}
+
+static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer *cow)
+{
+ u64 refs;
+ u64 owner;
+ u64 flags;
+ u64 new_flags = 0;
+ int ret;
+
+ /*
+ * Backrefs update rules:
+ *
+ * Always use full backrefs for extent pointers in tree block
+ * allocated by tree relocation.
+ *
+ * If a shared tree block is no longer referenced by its owner
+ * tree (btrfs_header_owner(buf) == root->root_key.objectid),
+ * use full backrefs for extent pointers in tree block.
+ *
+ * If a tree block is been relocating
+ * (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID),
+ * use full backrefs for extent pointers in tree block.
+ * The reason for this is some operations (such as drop tree)
+ * are only allowed for blocks use full backrefs.
+ */
+
+ if (btrfs_block_can_be_shared(root, buf)) {
+ ret = btrfs_lookup_extent_info(trans, root, buf->start,
+ btrfs_header_level(buf), 1,
+ &refs, &flags);
+ BUG_ON(ret);
+ BUG_ON(refs == 0);
+ } else {
+ refs = 1;
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
+ btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
+ flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
+ else
+ flags = 0;
+ }
+
+ owner = btrfs_header_owner(buf);
+ BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) &&
+ owner == BTRFS_TREE_RELOC_OBJECTID);
+
+ if (refs > 1) {
+ if ((owner == root->root_key.objectid ||
+ root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) &&
+ !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
+ ret = btrfs_inc_ref(trans, root, buf, 1);
+ BUG_ON(ret);
+
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID) {
+ ret = btrfs_dec_ref(trans, root, buf, 0);
+ BUG_ON(ret);
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ BUG_ON(ret);
+ }
+ new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
+ } else {
+
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID)
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ else
+ ret = btrfs_inc_ref(trans, root, cow, 0);
+ BUG_ON(ret);
+ }
+ if (new_flags != 0) {
+ ret = btrfs_set_block_flags(trans, root, buf->start,
+ btrfs_header_level(buf),
+ new_flags);
+ BUG_ON(ret);
+ }
+ } else {
+ if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID)
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ else
+ ret = btrfs_inc_ref(trans, root, cow, 0);
+ BUG_ON(ret);
+ ret = btrfs_dec_ref(trans, root, buf, 1);
+ BUG_ON(ret);
+ }
+ clean_tree_block(trans, root, buf);
+ }
+ 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, u64 empty_size)
+{
+ struct extent_buffer *cow;
+ struct btrfs_disk_key disk_key;
+ int level;
+
+ WARN_ON(root->ref_cows && trans->transid !=
+ root->fs_info->running_transaction->transid);
+ WARN_ON(root->ref_cows && trans->transid != root->last_trans);
+
+ level = btrfs_header_level(buf);
+
+ if (level == 0)
+ btrfs_item_key(buf, &disk_key, 0);
+ else
+ btrfs_node_key(buf, &disk_key, 0);
+
+ cow = btrfs_alloc_free_block(trans, root, buf->len,
+ root->root_key.objectid, &disk_key,
+ level, search_start, empty_size);
+ if (IS_ERR(cow))
+ return PTR_ERR(cow);
+
+ copy_extent_buffer(cow, buf, 0, 0, cow->len);
+ btrfs_set_header_bytenr(cow, cow->start);
+ btrfs_set_header_generation(cow, trans->transid);
+ btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN |
+ BTRFS_HEADER_FLAG_RELOC);
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
+ btrfs_set_header_flag(cow, BTRFS_HEADER_FLAG_RELOC);
+ else
+ btrfs_set_header_owner(cow, root->root_key.objectid);
+
+ write_extent_buffer(cow, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ WARN_ON(!(buf->flags & EXTENT_BAD_TRANSID) &&
+ btrfs_header_generation(buf) > trans->transid);
+
+ update_ref_for_cow(trans, root, buf, cow);
+
if (buf == root->node) {
root->node = cow;
- cow->count++;
- if (buf != root->commit_root)
- free_extent(root, buf->blocknr, 1);
- tree_block_release(root, buf);
+ extent_buffer_get(cow);
+
+ btrfs_free_extent(trans, root, buf->start, buf->len,
+ 0, root->root_key.objectid, level, 0);
+ free_extent_buffer(buf);
+ add_root_to_dirty_list(root);
} else {
- parent->node.blockptrs[parent_slot] = cow->blocknr;
- BUG_ON(list_empty(&parent->dirty));
- free_extent(root, buf->blocknr, 1);
+ btrfs_set_node_blockptr(parent, parent_slot,
+ cow->start);
+ WARN_ON(trans->transid == 0);
+ btrfs_set_node_ptr_generation(parent, parent_slot,
+ trans->transid);
+ btrfs_mark_buffer_dirty(parent);
+ WARN_ON(btrfs_header_generation(parent) != trans->transid);
+
+ btrfs_free_extent(trans, root, buf->start, buf->len,
+ 0, root->root_key.objectid, level, 1);
}
- tree_block_release(root, buf);
+ if (!list_empty(&buf->recow)) {
+ list_del_init(&buf->recow);
+ free_extent_buffer(buf);
+ }
+ free_extent_buffer(buf);
+ btrfs_mark_buffer_dirty(cow);
+ *cow_ret = cow;
return 0;
}
-/*
- * The leaf data grows from end-to-front in the node.
- * this returns the address of the start of the last item,
- * which is the stop of the leaf data stack
- */
-static inline unsigned int leaf_data_end(struct leaf *leaf)
+static inline int should_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf)
{
- unsigned int nr = leaf->header.nritems;
- if (nr == 0)
- return sizeof(leaf->data);
- return leaf->items[nr-1].offset;
+ if (btrfs_header_generation(buf) == trans->transid &&
+ !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN) &&
+ !(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID &&
+ btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)))
+ return 0;
+ return 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 leaf_free_space(struct leaf *leaf)
+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)
{
- int data_end = leaf_data_end(leaf);
- int nritems = leaf->header.nritems;
- char *items_end = (char *)(leaf->items + nritems + 1);
- return (char *)(leaf->data + data_end) - (char *)items_end;
+ u64 search_start;
+ int ret;
+ /*
+ 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 %llu running %llu\n",
+ (unsigned long long)trans->transid,
+ (unsigned long long)root->fs_info->generation);
+ WARN_ON(1);
+ }
+ if (!should_cow_block(trans, root, buf)) {
+ *cow_ret = buf;
+ return 0;
+ }
+
+ search_start = buf->start & ~((u64)(1024 * 1024 * 1024) - 1);
+ ret = __btrfs_cow_block(trans, root, buf, parent,
+ parent_slot, cow_ret, search_start, 0);
+ return ret;
}
-/*
- * compare two keys in a memcmp fashion
- */
-int comp_keys(struct key *k1, struct key *k2)
+int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2)
{
if (k1->objectid > k2->objectid)
return 1;
if (k1->objectid < k2->objectid)
return -1;
- if (k1->flags > k2->flags)
+ if (k1->type > k2->type)
return 1;
- if (k1->flags < k2->flags)
+ if (k1->type < k2->type)
return -1;
if (k1->offset > k2->offset)
return 1;
return 0;
}
-int check_node(struct ctree_path *path, int level)
+/*
+ * compare two keys in a memcmp fashion
+ */
+static int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
+{
+ struct btrfs_key k1;
+
+ btrfs_disk_key_to_cpu(&k1, disk);
+ return btrfs_comp_cpu_keys(&k1, k2);
+}
+
+/*
+ * The leaf data grows from end-to-front in the node.
+ * this returns the address of the start of the last item,
+ * which is the stop of the leaf data stack
+ */
+static inline unsigned int leaf_data_end(struct btrfs_root *root,
+ struct extent_buffer *leaf)
+{
+ u32 nr = btrfs_header_nritems(leaf);
+ if (nr == 0)
+ return BTRFS_LEAF_DATA_SIZE(root);
+ return btrfs_item_offset_nr(leaf, nr - 1);
+}
+
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
+ struct extent_buffer *buf)
{
int i;
- struct node *parent = NULL;
- struct node *node = &path->nodes[level]->node;
- int parent_slot;
-
- if (path->nodes[level + 1])
- parent = &path->nodes[level + 1]->node;
- parent_slot = path->slots[level + 1];
- if (parent && node->header.nritems > 0) {
- struct key *parent_key;
- parent_key = &parent->keys[parent_slot];
- BUG_ON(memcmp(parent_key, node->keys, sizeof(struct key)));
- BUG_ON(parent->blockptrs[parent_slot] != node->header.blocknr);
- }
- BUG_ON(node->header.nritems > NODEPTRS_PER_BLOCK);
- for (i = 0; i < node->header.nritems - 2; i++) {
- BUG_ON(comp_keys(&node->keys[i], &node->keys[i+1]) >= 0);
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(root))
+ goto fail;
+
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ if (parent_key && parent_key->type) {
+ btrfs_node_key(buf, &key, 0);
+ if (memcmp(parent_key, &key, sizeof(key)))
+ goto fail;
}
- return 0;
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ for (i = 0; nritems > 1 && i < nritems - 2; i++) {
+ btrfs_node_key(buf, &key, i);
+ btrfs_node_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0)
+ goto fail;
+ }
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) {
+ if (parent_key)
+ btrfs_disk_key_to_cpu(&cpukey, parent_key);
+ else
+ btrfs_node_key_to_cpu(buf, &cpukey, 0);
+ btrfs_add_corrupt_extent_record(root->fs_info, &cpukey,
+ buf->start, buf->len,
+ btrfs_header_level(buf));
+ }
+ return ret;
}
-int check_leaf(struct ctree_path *path, int level)
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
+ struct extent_buffer *buf)
{
int i;
- struct leaf *leaf = &path->nodes[level]->leaf;
- struct node *parent = NULL;
- int parent_slot;
-
- if (path->nodes[level + 1])
- parent = &path->nodes[level + 1]->node;
- parent_slot = path->slots[level + 1];
- if (parent && leaf->header.nritems > 0) {
- struct key *parent_key;
- parent_key = &parent->keys[parent_slot];
- BUG_ON(memcmp(parent_key, &leaf->items[0].key,
- sizeof(struct key)));
- BUG_ON(parent->blockptrs[parent_slot] != leaf->header.blocknr);
- }
- for (i = 0; i < leaf->header.nritems - 2; i++) {
- BUG_ON(comp_keys(&leaf->items[i].key,
- &leaf->items[i+1].key) >= 0);
- BUG_ON(leaf->items[i].offset != leaf->items[i + 1].offset +
- leaf->items[i + 1].size);
- if (i == 0) {
- BUG_ON(leaf->items[i].offset + leaf->items[i].size !=
- LEAF_DATA_SIZE);
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems * sizeof(struct btrfs_item) > buf->len) {
+ fprintf(stderr, "invalid number of items %llu\n",
+ (unsigned long long)buf->start);
+ goto fail;
+ }
+
+ if (btrfs_header_level(buf) != 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_LEVEL;
+ fprintf(stderr, "leaf is not a leaf %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ if (btrfs_leaf_free_space(root, buf) < 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_FREE_SPACE;
+ fprintf(stderr, "leaf free space incorrect %llu %d\n",
+ (unsigned long long)btrfs_header_bytenr(buf),
+ btrfs_leaf_free_space(root, buf));
+ goto fail;
+ }
+
+ if (nritems == 0)
+ return BTRFS_TREE_BLOCK_CLEAN;
+
+ btrfs_item_key(buf, &key, 0);
+ if (parent_key && parent_key->type &&
+ memcmp(parent_key, &key, sizeof(key))) {
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ fprintf(stderr, "leaf parent key incorrect %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ for (i = 0; nritems > 1 && i < nritems - 1; i++) {
+ btrfs_item_key(buf, &key, i);
+ btrfs_item_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0) {
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ fprintf(stderr, "bad key ordering %d %d\n", i, i+1);
+ goto fail;
+ }
+ if (btrfs_item_offset_nr(buf, i) !=
+ btrfs_item_end_nr(buf, i + 1)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "incorrect offsets %u %u\n",
+ btrfs_item_offset_nr(buf, i),
+ btrfs_item_end_nr(buf, i + 1));
+ goto fail;
+ }
+ if (i == 0 && btrfs_item_end_nr(buf, i) !=
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "bad item end %u wanted %u\n",
+ btrfs_item_end_nr(buf, i),
+ (unsigned)BTRFS_LEAF_DATA_SIZE(root));
+ goto fail;
}
}
- BUG_ON(leaf_free_space(leaf) < 0);
- return 0;
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) {
+ if (parent_key)
+ btrfs_disk_key_to_cpu(&cpukey, parent_key);
+ else
+ btrfs_item_key_to_cpu(buf, &cpukey, 0);
+
+ btrfs_add_corrupt_extent_record(root->fs_info, &cpukey,
+ buf->start, buf->len, 0);
+ }
+ return ret;
}
-int check_block(struct ctree_path *path, int level)
+static int noinline check_block(struct btrfs_root *root,
+ struct btrfs_path *path, int level)
{
+ struct btrfs_disk_key key;
+ struct btrfs_disk_key *key_ptr = NULL;
+ struct extent_buffer *parent;
+ enum btrfs_tree_block_status ret;
+
+ if (path->skip_check_block)
+ return 0;
+ if (path->nodes[level + 1]) {
+ parent = path->nodes[level + 1];
+ btrfs_node_key(parent, &key, path->slots[level + 1]);
+ key_ptr = &key;
+ }
if (level == 0)
- return check_leaf(path, level);
- return check_node(path, level);
+ ret = btrfs_check_leaf(root, key_ptr, path->nodes[0]);
+ else
+ ret = btrfs_check_node(root, key_ptr, path->nodes[level]);
+ if (ret == BTRFS_TREE_BLOCK_CLEAN)
+ return 0;
+ return -EIO;
}
/*
- * 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
*/
-int generic_bin_search(char *p, int item_size, struct 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 key *tmp;
+ unsigned long offset;
+ struct btrfs_disk_key *tmp;
while(low < high) {
mid = (low + high) / 2;
- tmp = (struct key *)(p + mid * item_size);
- ret = comp_keys(tmp, key);
+ offset = p + mid * item_size;
+
+ tmp = (struct btrfs_disk_key *)(eb->data + offset);
+ ret = btrfs_comp_keys(tmp, key);
if (ret < 0)
low = mid + 1;
* simple bin_search frontend that does the right thing for
* leaves vs nodes
*/
-int bin_search(struct node *c, struct key *key, int *slot)
+static int bin_search(struct extent_buffer *eb, struct btrfs_key *key,
+ int level, int *slot)
{
- if (is_leaf(c->header.flags)) {
- struct leaf *l = (struct leaf *)c;
- return generic_bin_search((void *)l->items, sizeof(struct item),
- key, c->header.nritems, slot);
- } else {
- return generic_bin_search((void *)c->keys, sizeof(struct key),
- key, c->header.nritems, slot);
- }
- return -1;
+ if (level == 0)
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_leaf, items),
+ sizeof(struct btrfs_item),
+ key, btrfs_header_nritems(eb),
+ slot);
+ else
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
+ sizeof(struct btrfs_key_ptr),
+ key, btrfs_header_nritems(eb),
+ slot);
}
-struct tree_buffer *read_node_slot(struct ctree_root *root,
- struct tree_buffer *parent_buf,
- int slot)
+struct extent_buffer *read_node_slot(struct btrfs_root *root,
+ struct extent_buffer *parent, int slot)
{
- struct node *node = &parent_buf->node;
+ int level = btrfs_header_level(parent);
if (slot < 0)
return NULL;
- if (slot >= node->header.nritems)
+ if (slot >= btrfs_header_nritems(parent))
return NULL;
- return read_tree_block(root, node->blockptrs[slot]);
+
+ if (level == 0)
+ return NULL;
+
+ return read_tree_block(root, btrfs_node_blockptr(parent, slot),
+ btrfs_level_size(root, level - 1),
+ btrfs_node_ptr_generation(parent, slot));
}
-static int balance_level(struct ctree_root *root, struct ctree_path *path,
- int level)
+static int balance_level(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
{
- struct tree_buffer *right_buf;
- struct tree_buffer *mid_buf;
- struct tree_buffer *left_buf;
- struct tree_buffer *parent_buf = NULL;
- struct node *right = NULL;
- struct node *mid;
- struct node *left = NULL;
- struct 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;
if (level == 0)
return 0;
- mid_buf = path->nodes[level];
- mid = &mid_buf->node;
- orig_ptr = mid->blockptrs[orig_slot];
+ mid = path->nodes[level];
+ WARN_ON(btrfs_header_generation(mid) != trans->transid);
- if (level < MAX_LEVEL - 1)
- parent_buf = path->nodes[level + 1];
- pslot = path->slots[level + 1];
+ orig_ptr = btrfs_node_blockptr(mid, orig_slot);
- if (!parent_buf) {
- struct tree_buffer *child;
- u64 blocknr = mid_buf->blocknr;
+ if (level < BTRFS_MAX_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) {
+ struct extent_buffer *child;
- if (mid->header.nritems != 1)
+ if (btrfs_header_nritems(mid) != 1)
return 0;
/* promote the child to a root */
- child = read_node_slot(root, mid_buf, 0);
- BUG_ON(!child);
+ child = read_node_slot(root, mid, 0);
+ BUG_ON(!extent_buffer_uptodate(child));
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
+ BUG_ON(ret);
+
root->node = child;
+ add_root_to_dirty_list(root);
path->nodes[level] = NULL;
+ clean_tree_block(trans, root, mid);
+ wait_on_tree_block_writeback(root, mid);
/* once for the path */
- tree_block_release(root, mid_buf);
+ free_extent_buffer(mid);
+
+ ret = btrfs_free_extent(trans, root, mid->start, mid->len,
+ 0, root->root_key.objectid,
+ level, 1);
/* once for the root ptr */
- tree_block_release(root, mid_buf);
- clean_tree_block(root, mid_buf);
- return free_extent(root, blocknr, 1);
+ free_extent_buffer(mid);
+ return ret;
}
- parent = &parent_buf->node;
-
- if (mid->header.nritems > NODEPTRS_PER_BLOCK / 4)
+ 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);
+ left = read_node_slot(root, parent, pslot - 1);
+ if (extent_buffer_uptodate(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 (extent_buffer_uptodate(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(root, left_buf, parent_buf,
- pslot - 1, &left_buf);
- left = &left_buf->node;
- orig_slot += left->header.nritems;
- wret = push_node_left(root, left_buf, mid_buf);
+ if (left) {
+ orig_slot += btrfs_header_nritems(left);
+ wret = push_node_left(trans, root, left, mid, 1);
if (wret < 0)
ret = wret;
}
/*
* then try to empty the right most buffer into the middle
*/
- if (right_buf) {
- btrfs_cow_block(root, right_buf, parent_buf,
- pslot + 1, &right_buf);
- right = &right_buf->node;
- wret = push_node_left(root, mid_buf, right_buf);
- if (wret < 0)
+ if (right) {
+ wret = push_node_left(trans, root, mid, right, 1);
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
- if (right->header.nritems == 0) {
- u64 blocknr = right_buf->blocknr;
- tree_block_release(root, right_buf);
- clean_tree_block(root, right_buf);
- right_buf = NULL;
+ if (btrfs_header_nritems(right) == 0) {
+ u64 bytenr = right->start;
+ u32 blocksize = right->len;
+
+ clean_tree_block(trans, root, right);
+ wait_on_tree_block_writeback(root, right);
+ free_extent_buffer(right);
right = NULL;
- wret = del_ptr(root, path, level + 1, pslot + 1);
+ wret = btrfs_del_ptr(trans, root, path,
+ level + 1, pslot + 1);
if (wret)
ret = wret;
- wret = free_extent(root, blocknr, 1);
+ wret = btrfs_free_extent(trans, root, bytenr,
+ blocksize, 0,
+ root->root_key.objectid,
+ level, 0);
if (wret)
ret = wret;
} else {
- memcpy(parent->keys + pslot + 1, right->keys,
- sizeof(struct key));
- BUG_ON(list_empty(&parent_buf->dirty));
+ 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 (mid->header.nritems == 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(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;
+ }
+ if (wret == 1) {
+ wret = push_node_left(trans, root, left, mid, 1);
+ if (wret < 0)
+ ret = wret;
+ }
BUG_ON(wret == 1);
}
- if (mid->header.nritems == 0) {
+ if (btrfs_header_nritems(mid) == 0) {
/* we've managed to empty the middle node, drop it */
- u64 blocknr = mid_buf->blocknr;
- tree_block_release(root, mid_buf);
- clean_tree_block(root, mid_buf);
- mid_buf = NULL;
+ u64 bytenr = mid->start;
+ u32 blocksize = mid->len;
+ clean_tree_block(trans, root, mid);
+ wait_on_tree_block_writeback(root, mid);
+ free_extent_buffer(mid);
mid = NULL;
- wret = del_ptr(root, path, level + 1, pslot);
+ wret = btrfs_del_ptr(trans, root, path, level + 1, pslot);
if (wret)
ret = wret;
- wret = free_extent(root, blocknr, 1);
+ wret = btrfs_free_extent(trans, root, bytenr, blocksize,
+ 0, root->root_key.objectid,
+ level, 0);
if (wret)
ret = wret;
} else {
/* update the parent key to reflect our changes */
- memcpy(parent->keys + pslot, mid->keys, sizeof(struct key));
- BUG_ON(list_empty(&parent_buf->dirty));
+ 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 (left->header.nritems > orig_slot) {
- left_buf->count++; // released below
- 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)
- tree_block_release(root, mid_buf);
+ if (mid)
+ free_extent_buffer(mid);
} else {
- orig_slot -= left->header.nritems;
+ orig_slot -= btrfs_header_nritems(left);
path->slots[level] = orig_slot;
}
}
/* double check we haven't messed things up */
- check_block(path, level);
- if (orig_ptr != path->nodes[level]->node.blockptrs[path->slots[level]])
+ check_block(root, path, level);
+ if (orig_ptr !=
+ btrfs_node_blockptr(path->nodes[level], path->slots[level]))
BUG();
-
- if (right_buf)
- tree_block_release(root, right_buf);
- if (left_buf)
- tree_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 noinline 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];
+
+ if (level == 0)
+ return 1;
+
+ mid = path->nodes[level];
+ WARN_ON(btrfs_header_generation(mid) != trans->transid);
+
+ 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 (extent_buffer_uptodate(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, 0);
+ }
+ }
+ 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);
+ }
+ 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 (extent_buffer_uptodate(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);
+ }
+ return 0;
+ }
+ free_extent_buffer(right);
+ }
+ return 1;
+}
+
+/*
+ * readahead one full node of leaves
+ */
+void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
+ int level, int slot, u64 objectid)
+{
+ struct extent_buffer *node;
+ struct btrfs_disk_key disk_key;
+ u32 nritems;
+ u64 search;
+ u64 lowest_read;
+ u64 highest_read;
+ u64 nread = 0;
+ int direction = path->reada;
+ struct extent_buffer *eb;
+ u32 nr;
+ u32 blocksize;
+ u32 nscan = 0;
+
+ if (level != 1)
+ return;
+
+ if (!path->nodes[level])
+ return;
+
+ node = path->nodes[level];
+ search = btrfs_node_blockptr(node, slot);
+ blocksize = btrfs_level_size(root, level - 1);
+ eb = btrfs_find_tree_block(root, search, blocksize);
+ if (eb) {
+ free_extent_buffer(eb);
+ return;
+ }
+
+ highest_read = search;
+ lowest_read = search;
+
+ nritems = btrfs_header_nritems(node);
+ nr = slot;
+ while(1) {
+ if (direction < 0) {
+ if (nr == 0)
+ break;
+ nr--;
+ } else if (direction > 0) {
+ nr++;
+ if (nr >= nritems)
+ break;
+ }
+ if (path->reada < 0 && objectid) {
+ btrfs_node_key(node, &disk_key, nr);
+ if (btrfs_disk_key_objectid(&disk_key) != objectid)
+ break;
+ }
+ search = btrfs_node_blockptr(node, nr);
+ if ((search >= lowest_read && search <= highest_read) ||
+ (search < lowest_read && lowest_read - search <= 32768) ||
+ (search > highest_read && search - highest_read <= 32768)) {
+ readahead_tree_block(root, search, blocksize,
+ btrfs_node_ptr_generation(node, nr));
+ nread += blocksize;
+ }
+ nscan++;
+ if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32))
+ break;
+ if(nread > (1024 * 1024) || nscan > 128)
+ break;
+
+ if (search < lowest_read)
+ lowest_read = search;
+ if (search > highest_read)
+ highest_read = search;
+ }
+}
+
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key)
+{
+ int ret;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
+
+ key.type = key_type;
+ key.objectid = iobjectid;
+ key.offset = ioff;
+
+ if (found_path == NULL) {
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ } else
+ path = found_path;
+
+ ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
+ if ((ret < 0) || (found_key == NULL)) {
+ if (path != found_path)
+ btrfs_free_path(path);
+ return ret;
+ }
+
+ eb = path->nodes[0];
+ if (ret && path->slots[0] >= btrfs_header_nritems(eb)) {
+ ret = btrfs_next_leaf(fs_root, path);
+ if (ret)
+ return ret;
+ eb = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(eb, found_key, path->slots[0]);
+ if (found_key->type != key.type ||
+ found_key->objectid != key.objectid)
+ return 1;
+
+ return 0;
+}
+
/*
* 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
* tree. if ins_len < 0, nodes will be merged as we walk down the tree (if
* possible)
*/
-int search_slot(struct ctree_root *root, struct key *key,
- struct ctree_path *p, int ins_len, int cow)
+int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *key, struct btrfs_path *p, int
+ ins_len, int cow)
{
- struct tree_buffer *b;
- struct tree_buffer *cow_buf;
- struct node *c;
+ struct extent_buffer *b;
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 > 0);
+ WARN_ON(p->nodes[0] != NULL);
+ /*
+ WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex));
+ */
again:
b = root->node;
- b->count++;
+ extent_buffer_get(b);
while (b) {
- level = node_level(b->node.header.flags);
+ level = btrfs_header_level(b);
if (cow) {
int wret;
- wret = btrfs_cow_block(root, b, p->nodes[level + 1],
- p->slots[level + 1], &cow_buf);
- b = cow_buf;
+ wret = btrfs_cow_block(trans, root, b,
+ p->nodes[level + 1],
+ p->slots[level + 1],
+ &b);
+ if (wret) {
+ free_extent_buffer(b);
+ return wret;
+ }
}
BUG_ON(!cow && ins_len);
- c = &b->node;
+ if (level != btrfs_header_level(b))
+ WARN_ON(1);
+ level = btrfs_header_level(b);
p->nodes[level] = b;
- ret = check_block(p, level);
+ ret = check_block(root, p, level);
if (ret)
return -1;
- ret = bin_search(c, key, &slot);
- if (!is_leaf(c->header.flags)) {
+ ret = bin_search(b, key, level, &slot);
+ if (level != 0) {
if (ret && slot > 0)
slot -= 1;
p->slots[level] = slot;
- if (ins_len > 0 &&
- c->header.nritems == NODEPTRS_PER_BLOCK) {
- int sret = split_node(root, p, level);
+ if ((p->search_for_split || ins_len > 0) &&
+ btrfs_header_nritems(b) >=
+ BTRFS_NODEPTRS_PER_BLOCK(root) - 3) {
+ int sret = split_node(trans, root, p, level);
BUG_ON(sret > 0);
if (sret)
return sret;
b = p->nodes[level];
- c = &b->node;
slot = p->slots[level];
} else if (ins_len < 0) {
- int sret = balance_level(root, p, level);
+ int sret = balance_level(trans, root, p,
+ level);
if (sret)
return sret;
b = p->nodes[level];
- if (!b)
+ if (!b) {
+ btrfs_release_path(p);
goto again;
- c = &b->node;
+ }
slot = p->slots[level];
- BUG_ON(c->header.nritems == 1);
+ BUG_ON(btrfs_header_nritems(b) == 1);
}
- b = read_tree_block(root, c->blockptrs[slot]);
+ /* this is only true while dropping a snapshot */
+ if (level == lowest_level)
+ break;
+
+ if (should_reada)
+ reada_for_search(root, p, level, slot,
+ key->objectid);
+
+ b = read_node_slot(root, b, slot);
+ if (!extent_buffer_uptodate(b))
+ return -EIO;
} else {
- struct leaf *l = (struct leaf *)c;
p->slots[level] = slot;
- if (ins_len > 0 && leaf_free_space(l) <
- sizeof(struct item) + ins_len) {
- int sret = split_leaf(root, p, ins_len);
+ if (ins_len > 0 &&
+ ins_len > btrfs_leaf_free_space(root, b)) {
+ int sret = split_leaf(trans, root, key,
+ p, ins_len, ret == 0);
BUG_ON(sret > 0);
if (sret)
return sret;
}
- BUG_ON(root->node->count == 1);
return ret;
}
}
- BUG_ON(root->node->count == 1);
return 1;
}
* This is used after shifting pointers to the left, so it stops
* fixing up pointers when a given leaf/node is not in slot 0 of the
* higher levels
- *
- * 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 ctree_root *root,
- struct ctree_path *path, struct key *key,
- int level)
+void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_disk_key *key, int level)
{
int i;
- int ret = 0;
- for (i = level; i < MAX_LEVEL; i++) {
- struct node *t;
+ struct extent_buffer *t;
+
+ for (i = level; i < BTRFS_MAX_LEVEL; i++) {
int tslot = path->slots[i];
if (!path->nodes[i])
break;
- t = &path->nodes[i]->node;
- memcpy(t->keys + tslot, key, sizeof(*key));
- BUG_ON(list_empty(&path->nodes[i]->dirty));
+ t = path->nodes[i];
+ btrfs_set_node_key(t, key, tslot);
+ btrfs_mark_buffer_dirty(path->nodes[i]);
if (tslot != 0)
break;
}
- return ret;
+}
+
+/*
+ * update item key.
+ *
+ * This function isn't completely safe. It's the caller's responsibility
+ * that the new key won't break the order
+ */
+int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_key *new_key)
+{
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *eb;
+ int slot;
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ if (slot > 0) {
+ btrfs_item_key(eb, &disk_key, slot - 1);
+ if (btrfs_comp_keys(&disk_key, new_key) >= 0)
+ return -1;
+ }
+ if (slot < btrfs_header_nritems(eb) - 1) {
+ btrfs_item_key(eb, &disk_key, slot + 1);
+ if (btrfs_comp_keys(&disk_key, new_key) <= 0)
+ return -1;
+ }
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(eb, &disk_key, slot);
+ btrfs_mark_buffer_dirty(eb);
+ if (slot == 0)
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
+ return 0;
+}
+
+/*
+ * update an item key without the safety checks. This is meant to be called by
+ * fsck only.
+ */
+void btrfs_set_item_key_unsafe(struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key)
+{
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *eb;
+ int slot;
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(eb, &disk_key, slot);
+ btrfs_mark_buffer_dirty(eb);
+ if (slot == 0)
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
/*
* returns 0 if some ptrs were pushed left, < 0 if there was some horrible
* error, and > 0 if there was no room in the left hand block.
*/
-static int push_node_left(struct ctree_root *root, struct tree_buffer *dst_buf,
- struct tree_buffer *src_buf)
+static int push_node_left(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *dst,
+ struct extent_buffer *src, int empty)
{
- struct node *src = &src_buf->node;
- struct node *dst = &dst_buf->node;
int push_items = 0;
int src_nritems;
int dst_nritems;
int ret = 0;
- src_nritems = src->header.nritems;
- dst_nritems = dst->header.nritems;
- push_items = NODEPTRS_PER_BLOCK - dst_nritems;
+ src_nritems = btrfs_header_nritems(src);
+ dst_nritems = btrfs_header_nritems(dst);
+ push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
+ WARN_ON(btrfs_header_generation(src) != trans->transid);
+ WARN_ON(btrfs_header_generation(dst) != trans->transid);
+
+ if (!empty && src_nritems <= 8)
+ return 1;
+
if (push_items <= 0) {
return 1;
}
- if (src_nritems < push_items)
- push_items = src_nritems;
+ if (empty) {
+ push_items = min(src_nritems, push_items);
+ if (push_items < src_nritems) {
+ /* leave at least 8 pointers in the node if
+ * we aren't going to empty it
+ */
+ if (src_nritems - push_items < 8) {
+ if (push_items <= 8)
+ return 1;
+ push_items -= 8;
+ }
+ }
+ } else
+ push_items = min(src_nritems - 8, push_items);
+
+ 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));
- memcpy(dst->keys + dst_nritems, src->keys,
- push_items * sizeof(struct key));
- memcpy(dst->blockptrs + dst_nritems, src->blockptrs,
- push_items * sizeof(u64));
if (push_items < src_nritems) {
- memmove(src->keys, src->keys + push_items,
- (src_nritems - push_items) * sizeof(struct key));
- memmove(src->blockptrs, src->blockptrs + push_items,
- (src_nritems - push_items) * sizeof(u64));
+ 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));
}
- src->header.nritems -= push_items;
- dst->header.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);
+ btrfs_mark_buffer_dirty(dst);
- BUG_ON(list_empty(&src_buf->dirty));
- BUG_ON(list_empty(&dst_buf->dirty));
return ret;
}
*
* this will only push up to 1/2 the contents of the left node over
*/
-static int balance_node_right(struct ctree_root *root,
- struct tree_buffer *dst_buf,
- struct tree_buffer *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 node *src = &src_buf->node;
- struct node *dst = &dst_buf->node;
int push_items = 0;
int max_push;
int src_nritems;
int dst_nritems;
int ret = 0;
- src_nritems = src->header.nritems;
- dst_nritems = dst->header.nritems;
- push_items = NODEPTRS_PER_BLOCK - dst_nritems;
+ WARN_ON(btrfs_header_generation(src) != trans->transid);
+ WARN_ON(btrfs_header_generation(dst) != trans->transid);
+
+ 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 < 4) {
+ 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;
- memmove(dst->keys + push_items, dst->keys,
- dst_nritems * sizeof(struct key));
- memmove(dst->blockptrs + push_items, dst->blockptrs,
- dst_nritems * sizeof(u64));
- memcpy(dst->keys, src->keys + src_nritems - push_items,
- push_items * sizeof(struct key));
- memcpy(dst->blockptrs, src->blockptrs + src_nritems - push_items,
- push_items * sizeof(u64));
+ memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items),
+ btrfs_node_key_ptr_offset(0),
+ (dst_nritems) *
+ sizeof(struct btrfs_key_ptr));
- src->header.nritems -= push_items;
- dst->header.nritems += push_items;
+ 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, src_nritems - push_items);
+ btrfs_set_header_nritems(dst, dst_nritems + push_items);
+
+ btrfs_mark_buffer_dirty(src);
+ btrfs_mark_buffer_dirty(dst);
- BUG_ON(list_empty(&src_buf->dirty));
- BUG_ON(list_empty(&dst_buf->dirty));
return ret;
}
*
* returns zero on success or < 0 on failure.
*/
-static int insert_new_root(struct ctree_root *root,
- struct ctree_path *path, int level)
+static int noinline insert_new_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
{
- struct tree_buffer *t;
- struct node *lower;
- struct node *c;
- struct key *lower_key;
+ u64 lower_gen;
+ struct extent_buffer *lower;
+ struct extent_buffer *c;
+ struct extent_buffer *old;
+ struct btrfs_disk_key lower_key;
BUG_ON(path->nodes[level]);
BUG_ON(path->nodes[level-1] != root->node);
- t = alloc_free_block(root);
- c = &t->node;
- memset(c, 0, sizeof(c));
- c->header.nritems = 1;
- c->header.flags = node_level(level);
- c->header.blocknr = t->blocknr;
- c->header.parentid = root->node->node.header.parentid;
- lower = &path->nodes[level-1]->node;
- if (is_leaf(lower->header.flags))
- lower_key = &((struct leaf *)lower)->items[0].key;
+ lower = path->nodes[level-1];
+ if (level == 1)
+ btrfs_item_key(lower, &lower_key, 0);
else
- lower_key = lower->keys;
- memcpy(c->keys, lower_key, sizeof(struct key));
- c->blockptrs[0] = path->nodes[level-1]->blocknr;
+ btrfs_node_key(lower, &lower_key, 0);
+
+ c = btrfs_alloc_free_block(trans, root, root->nodesize,
+ root->root_key.objectid, &lower_key,
+ level, root->node->start, 0);
+
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+
+ memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_nritems(c, 1);
+ btrfs_set_header_level(c, level);
+ btrfs_set_header_bytenr(c, c->start);
+ btrfs_set_header_generation(c, trans->transid);
+ btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(c, root->root_key.objectid);
+
+ write_extent_buffer(c, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(c),
+ BTRFS_UUID_SIZE);
+
+ btrfs_set_node_key(c, &lower_key, 0);
+ btrfs_set_node_blockptr(c, 0, lower->start);
+ lower_gen = btrfs_header_generation(lower);
+ WARN_ON(lower_gen != trans->transid);
+
+ btrfs_set_node_ptr_generation(c, 0, lower_gen);
+
+ btrfs_mark_buffer_dirty(c);
+
+ old = root->node;
+ root->node = c;
+
/* the super has an extra ref to root->node */
- tree_block_release(root, root->node);
- root->node = t;
- t->count++;
- path->nodes[level] = t;
+ free_extent_buffer(old);
+
+ add_root_to_dirty_list(root);
+ extent_buffer_get(c);
+ path->nodes[level] = c;
path->slots[level] = 0;
return 0;
}
*
* returns zero on success and < 0 on any error
*/
-static int insert_ptr(struct ctree_root *root,
- struct ctree_path *path, struct key *key,
- u64 blocknr, int slot, int level)
+static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, struct btrfs_disk_key
+ *key, u64 bytenr, int slot, int level)
{
- struct node *lower;
+ struct extent_buffer *lower;
int nritems;
BUG_ON(!path->nodes[level]);
- lower = &path->nodes[level]->node;
- nritems = lower->header.nritems;
+ lower = path->nodes[level];
+ nritems = btrfs_header_nritems(lower);
if (slot > nritems)
BUG();
- if (nritems == NODEPTRS_PER_BLOCK)
+ if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root))
BUG();
if (slot != nritems) {
- memmove(lower->keys + slot + 1, lower->keys + slot,
- (nritems - slot) * sizeof(struct key));
- memmove(lower->blockptrs + slot + 1, lower->blockptrs + slot,
- (nritems - slot) * sizeof(u64));
- }
- memcpy(lower->keys + slot, key, sizeof(struct key));
- lower->blockptrs[slot] = blocknr;
- lower->header.nritems++;
- if (lower->keys[1].objectid == 0)
- BUG();
- BUG_ON(list_empty(&path->nodes[level]->dirty));
+ 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_set_node_key(lower, key, slot);
+ btrfs_set_node_blockptr(lower, slot, bytenr);
+ WARN_ON(trans->transid == 0);
+ btrfs_set_node_ptr_generation(lower, slot, trans->transid);
+ btrfs_set_header_nritems(lower, nritems + 1);
+ btrfs_mark_buffer_dirty(lower);
return 0;
}
*
* returns 0 on success and < 0 on failure
*/
-static int split_node(struct ctree_root *root, struct ctree_path *path,
- int level)
+static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int level)
{
- struct tree_buffer *t;
- struct node *c;
- struct tree_buffer *split_buffer;
- struct 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 = &t->node;
- if (t == root->node) {
+ c = path->nodes[level];
+ WARN_ON(btrfs_header_generation(c) != trans->transid);
+ if (c == root->node) {
/* trying to split the root, lets make a new one */
- ret = insert_new_root(root, path, level + 1);
+ 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) - 3)
+ return 0;
+ if (ret < 0)
+ return ret;
}
- split_buffer = alloc_free_block(root);
- split = &split_buffer->node;
- split->header.flags = c->header.flags;
- split->header.blocknr = split_buffer->blocknr;
- split->header.parentid = root->node->node.header.parentid;
- mid = (c->header.nritems + 1) / 2;
- memcpy(split->keys, c->keys + mid,
- (c->header.nritems - mid) * sizeof(struct key));
- memcpy(split->blockptrs, c->blockptrs + mid,
- (c->header.nritems - mid) * sizeof(u64));
- split->header.nritems = c->header.nritems - mid;
- c->header.nritems = mid;
+
+ c_nritems = btrfs_header_nritems(c);
+ mid = (c_nritems + 1) / 2;
+ btrfs_node_key(c, &disk_key, mid);
+
+ split = btrfs_alloc_free_block(trans, root, root->nodesize,
+ root->root_key.objectid,
+ &disk_key, level, c->start, 0);
+ if (IS_ERR(split))
+ return PTR_ERR(split);
+
+ memset_extent_buffer(split, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_level(split, btrfs_header_level(c));
+ btrfs_set_header_bytenr(split, split->start);
+ btrfs_set_header_generation(split, trans->transid);
+ btrfs_set_header_backref_rev(split, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(split, root->root_key.objectid);
+ write_extent_buffer(split, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+ write_extent_buffer(split, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(split),
+ BTRFS_UUID_SIZE);
+
+
+ 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;
- BUG_ON(list_empty(&t->dirty));
- wret = insert_ptr(root, path, split->keys, split_buffer->blocknr,
- path->slots[level + 1] + 1, level + 1);
+ btrfs_mark_buffer_dirty(c);
+ btrfs_mark_buffer_dirty(split);
+
+ wret = insert_ptr(trans, root, path, &disk_key, split->start,
+ path->slots[level + 1] + 1,
+ level + 1);
if (wret)
ret = wret;
if (path->slots[level] >= mid) {
path->slots[level] -= mid;
- tree_block_release(root, t);
- path->nodes[level] = split_buffer;
+ free_extent_buffer(c);
+ path->nodes[level] = split;
path->slots[level + 1] += 1;
} else {
- tree_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 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 = l->items[start].offset + l->items[start].size;
- data_len = data_len - l->items[end].offset;
- data_len += sizeof(struct item) * nr;
+ 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, (unsigned long) 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
*
* returns 1 if the push failed because the other node didn't have enough
* room, 0 if everything worked out and < 0 if there were major errors.
*/
-static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
- int data_size)
+static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
{
- struct tree_buffer *left_buf = path->nodes[0];
- struct leaf *left = &left_buf->leaf;
- struct leaf *right;
- struct tree_buffer *right_buf;
- struct tree_buffer *upper;
+ 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;
+ u32 i;
int free_space;
int push_space = 0;
int push_items = 0;
- struct item *item;
+ struct btrfs_item *item;
+ u32 left_nritems;
+ u32 nr;
+ u32 right_nritems;
+ u32 data_end;
+ u32 this_item_size;
+ int ret;
slot = path->slots[1];
if (!path->nodes[1]) {
return 1;
}
upper = path->nodes[1];
- if (slot >= upper->node.header.nritems - 1) {
+ if (slot >= btrfs_header_nritems(upper) - 1)
return 1;
+
+ right = read_node_slot(root, upper, slot + 1);
+ if (!extent_buffer_uptodate(right)) {
+ if (IS_ERR(right))
+ return PTR_ERR(right);
+ return -EIO;
}
- right_buf = read_tree_block(root, upper->node.blockptrs[slot + 1]);
- right = &right_buf->leaf;
- free_space = leaf_free_space(right);
- if (free_space < data_size + sizeof(struct item)) {
- tree_block_release(root, right_buf);
+ free_space = btrfs_leaf_free_space(root, right);
+ if (free_space < data_size) {
+ free_extent_buffer(right);
return 1;
}
+
/* cow and double check */
- btrfs_cow_block(root, right_buf, upper, slot + 1, &right_buf);
- right = &right_buf->leaf;
- free_space = leaf_free_space(right);
- if (free_space < data_size + sizeof(struct item)) {
- tree_block_release(root, 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) {
+ free_extent_buffer(right);
+ return 1;
+ }
+
+ left_nritems = btrfs_header_nritems(left);
+ if (left_nritems == 0) {
+ free_extent_buffer(right);
return 1;
}
- for (i = left->header.nritems - 1; i >= 0; i--) {
- item = left->items + i;
+ if (empty)
+ nr = 0;
+ else
+ nr = 1;
+
+ i = left_nritems - 1;
+ while (i >= nr) {
+ item = btrfs_item_nr(i);
+
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
- if (item->size + sizeof(*item) + push_space > free_space)
+
+ this_item_size = btrfs_item_size(left, item);
+ if (this_item_size + sizeof(*item) + push_space > free_space)
break;
push_items++;
- push_space += item->size + sizeof(*item);
+ push_space += this_item_size + sizeof(*item);
+ if (i == 0)
+ break;
+ i--;
}
+
if (push_items == 0) {
- tree_block_release(root, right_buf);
+ free_extent_buffer(right);
return 1;
}
+
+ if (!empty && push_items == left_nritems)
+ WARN_ON(1);
+
/* push left to right */
- push_space = left->items[left->header.nritems - push_items].offset +
- left->items[left->header.nritems - push_items].size;
- push_space -= leaf_data_end(left);
+ 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 */
- memmove(right->data + leaf_data_end(right) - push_space,
- right->data + leaf_data_end(right),
- LEAF_DATA_SIZE - leaf_data_end(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 */
- memcpy(right->data + LEAF_DATA_SIZE - push_space,
- left->data + leaf_data_end(left),
- push_space);
- memmove(right->items + push_items, right->items,
- right->header.nritems * sizeof(struct item));
+ 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);
+
+ 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 */
- memcpy(right->items, left->items + left->header.nritems - push_items,
- push_items * sizeof(struct 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->header.nritems += push_items;
- push_space = LEAF_DATA_SIZE;
- for (i = 0; i < right->header.nritems; i++) {
- right->items[i].offset = push_space - right->items[i].size;
- push_space = right->items[i].offset;
+ right_nritems += push_items;
+ btrfs_set_header_nritems(right, right_nritems);
+ push_space = BTRFS_LEAF_DATA_SIZE(root);
+ for (i = 0; i < right_nritems; i++) {
+ item = btrfs_item_nr(i);
+ push_space -= btrfs_item_size(right, item);
+ btrfs_set_item_offset(right, item, push_space);
}
- left->header.nritems -= push_items;
- BUG_ON(list_empty(&left_buf->dirty));
- BUG_ON(list_empty(&right_buf->dirty));
- memcpy(upper->node.keys + slot + 1,
- &right->items[0].key, sizeof(struct key));
- BUG_ON(list_empty(&upper->dirty));
+ left_nritems -= push_items;
+ btrfs_set_header_nritems(left, left_nritems);
+
+ if (left_nritems)
+ 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->header.nritems) {
- path->slots[0] -= left->header.nritems;
- tree_block_release(root, path->nodes[0]);
- path->nodes[0] = right_buf;
+ if (path->slots[0] >= left_nritems) {
+ path->slots[0] -= left_nritems;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
path->slots[1] += 1;
} else {
- tree_block_release(root, right_buf);
+ free_extent_buffer(right);
}
return 0;
}
* push some data in the path leaf to the left, trying to free up at
* least data_size bytes. returns zero if the push worked, nonzero otherwise
*/
-static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
- int data_size)
+static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
{
- struct tree_buffer *right_buf = path->nodes[0];
- struct leaf *right = &right_buf->leaf;
- struct tree_buffer *t;
- struct 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_space = 0;
int push_items = 0;
- struct item *item;
- int old_left_nritems;
+ struct btrfs_item *item;
+ u32 old_left_nritems;
+ u32 right_nritems;
+ u32 nr;
int ret = 0;
- int wret;
+ u32 this_item_size;
+ u32 old_left_item_size;
slot = path->slots[1];
- if (slot == 0) {
+ if (slot == 0)
return 1;
- }
- if (!path->nodes[1]) {
+ if (!path->nodes[1])
+ return 1;
+
+ right_nritems = btrfs_header_nritems(right);
+ if (right_nritems == 0) {
return 1;
}
- t = read_tree_block(root, path->nodes[1]->node.blockptrs[slot - 1]);
- left = &t->leaf;
- free_space = leaf_free_space(left);
- if (free_space < data_size + sizeof(struct item)) {
- tree_block_release(root, t);
+
+ left = read_node_slot(root, path->nodes[1], slot - 1);
+ free_space = btrfs_leaf_free_space(root, left);
+ if (free_space < data_size) {
+ free_extent_buffer(left);
return 1;
}
/* cow and double check */
- btrfs_cow_block(root, t, path->nodes[1], slot - 1, &t);
- left = &t->leaf;
- free_space = leaf_free_space(left);
- if (free_space < data_size + sizeof(struct item)) {
- tree_block_release(root, 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) {
+ free_extent_buffer(left);
return 1;
}
- for (i = 0; i < right->header.nritems; i++) {
- item = right->items + i;
+ if (empty)
+ nr = right_nritems;
+ else
+ nr = right_nritems - 1;
+
+ for (i = 0; i < nr; i++) {
+ item = btrfs_item_nr(i);
+
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
- if (item->size + sizeof(*item) + push_space > free_space)
+
+ this_item_size = btrfs_item_size(right, item);
+ if (this_item_size + sizeof(*item) + push_space > free_space)
break;
+
push_items++;
- push_space += item->size + sizeof(*item);
+ push_space += this_item_size + sizeof(*item);
}
+
if (push_items == 0) {
- tree_block_release(root, t);
+ free_extent_buffer(left);
return 1;
}
- /* push data from right to left */
- memcpy(left->items + left->header.nritems,
- right->items, push_items * sizeof(struct item));
- push_space = LEAF_DATA_SIZE - right->items[push_items -1].offset;
- memcpy(left->data + leaf_data_end(left) - push_space,
- right->data + right->items[push_items - 1].offset,
- push_space);
- old_left_nritems = left->header.nritems;
- BUG_ON(old_left_nritems < 0);
+ if (!empty && push_items == btrfs_header_nritems(right))
+ WARN_ON(1);
- for(i = old_left_nritems; i < old_left_nritems + push_items; i++) {
- left->items[i].offset -= LEAF_DATA_SIZE -
- left->items[old_left_nritems -1].offset;
+ /* push data from right to left */
+ 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_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_nr(right, push_items - 1),
+ push_space);
+ old_left_nritems = btrfs_header_nritems(left);
+ BUG_ON(old_left_nritems == 0);
+
+ old_left_item_size = btrfs_item_offset_nr(left, old_left_nritems - 1);
+ for (i = old_left_nritems; i < old_left_nritems + push_items; i++) {
+ u32 ioff;
+
+ item = btrfs_item_nr(i);
+ ioff = btrfs_item_offset(left, item);
+ btrfs_set_item_offset(left, item,
+ ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size));
}
- left->header.nritems += push_items;
+ btrfs_set_header_nritems(left, old_left_nritems + push_items);
/* fixup right node */
- push_space = right->items[push_items-1].offset - leaf_data_end(right);
- memmove(right->data + LEAF_DATA_SIZE - push_space, right->data +
- leaf_data_end(right), push_space);
- memmove(right->items, right->items + push_items,
- (right->header.nritems - push_items) * sizeof(struct item));
- right->header.nritems -= push_items;
- push_space = LEAF_DATA_SIZE;
+ if (push_items > right_nritems) {
+ printk("push items %d nr %u\n", push_items, right_nritems);
+ WARN_ON(1);
+ }
- for (i = 0; i < right->header.nritems; i++) {
- right->items[i].offset = push_space - right->items[i].size;
- push_space = right->items[i].offset;
+ if (push_items < right_nritems) {
+ 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 -= push_items;
+ btrfs_set_header_nritems(right, right_nritems);
+ push_space = BTRFS_LEAF_DATA_SIZE(root);
+ for (i = 0; i < right_nritems; i++) {
+ item = btrfs_item_nr(i);
+ push_space = push_space - btrfs_item_size(right, item);
+ btrfs_set_item_offset(right, item, push_space);
}
- BUG_ON(list_empty(&t->dirty));
- BUG_ON(list_empty(&right_buf->dirty));
+ btrfs_mark_buffer_dirty(left);
+ if (right_nritems)
+ btrfs_mark_buffer_dirty(right);
- wret = fixup_low_keys(root, path, &right->items[0].key, 1);
- if (wret)
- ret = wret;
+ btrfs_item_key(right, &disk_key, 0);
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
path->slots[0] += old_left_nritems;
- tree_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 {
- tree_block_release(root, t);
+ free_extent_buffer(left);
path->slots[0] -= push_items;
}
BUG_ON(path->slots[0] < 0);
*
* returns 0 if all went well and < 0 on failure.
*/
-static int split_leaf(struct ctree_root *root, struct ctree_path *path,
- int data_size)
+static noinline int copy_for_split(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct extent_buffer *l,
+ struct extent_buffer *right,
+ int slot, int mid, int nritems)
{
- struct tree_buffer *l_buf;
- struct leaf *l;
- int nritems;
- int mid;
- int slot;
- struct leaf *right;
- struct tree_buffer *right_buffer;
- int space_needed = data_size + sizeof(struct item);
int data_copy_size;
int rt_data_off;
int i;
- int ret;
+ int ret = 0;
int wret;
+ struct btrfs_disk_key disk_key;
- wret = push_leaf_left(root, path, data_size);
- if (wret < 0)
- return wret;
- if (wret) {
- wret = push_leaf_right(root, path, data_size);
- if (wret < 0)
- return wret;
- }
+ nritems = nritems - mid;
+ btrfs_set_header_nritems(right, nritems);
+ data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
- l_buf = path->nodes[0];
- l = &l_buf->leaf;
+ copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(mid),
+ nritems * sizeof(struct btrfs_item));
- /* did the pushes work? */
- if (leaf_free_space(l) >= sizeof(struct item) + data_size)
- return 0;
+ 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);
- if (!path->nodes[1]) {
- ret = insert_new_root(root, path, 1);
- if (ret)
- return ret;
+ rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
+ btrfs_item_end_nr(l, mid);
+
+ for (i = 0; i < nritems; i++) {
+ struct btrfs_item *item = btrfs_item_nr(i);
+ u32 ioff = btrfs_item_offset(right, item);
+ btrfs_set_item_offset(right, item, ioff + rt_data_off);
}
- slot = path->slots[0];
- nritems = l->header.nritems;
- mid = (nritems + 1)/ 2;
- right_buffer = alloc_free_block(root);
- BUG_ON(!right_buffer);
- BUG_ON(mid == nritems);
- right = &right_buffer->leaf;
- memset(right, 0, sizeof(*right));
- if (mid <= slot) {
- /* FIXME, just alloc a new leaf here */
- if (leaf_space_used(l, mid, nritems - mid) + space_needed >
- LEAF_DATA_SIZE)
- BUG();
- } else {
- /* FIXME, just alloc a new leaf here */
- if (leaf_space_used(l, 0, mid + 1) + space_needed >
- LEAF_DATA_SIZE)
- BUG();
- }
- right->header.nritems = nritems - mid;
- right->header.blocknr = right_buffer->blocknr;
- right->header.flags = node_level(0);
- right->header.parentid = root->node->node.header.parentid;
- data_copy_size = l->items[mid].offset + l->items[mid].size -
- leaf_data_end(l);
- memcpy(right->items, l->items + mid,
- (nritems - mid) * sizeof(struct item));
- memcpy(right->data + LEAF_DATA_SIZE - data_copy_size,
- l->data + leaf_data_end(l), data_copy_size);
- rt_data_off = LEAF_DATA_SIZE -
- (l->items[mid].offset + l->items[mid].size);
-
- for (i = 0; i < right->header.nritems; i++)
- right->items[i].offset += rt_data_off;
-
- l->header.nritems = mid;
+
+ btrfs_set_header_nritems(l, mid);
ret = 0;
- wret = insert_ptr(root, path, &right->items[0].key,
- right_buffer->blocknr, path->slots[1] + 1, 1);
+ btrfs_item_key(right, &disk_key, 0);
+ wret = insert_ptr(trans, root, path, &disk_key, right->start,
+ path->slots[1] + 1, 1);
if (wret)
ret = wret;
- BUG_ON(list_empty(&right_buffer->dirty));
- BUG_ON(list_empty(&l_buf->dirty));
+
+ btrfs_mark_buffer_dirty(right);
+ btrfs_mark_buffer_dirty(l);
BUG_ON(path->slots[0] != slot);
+
if (mid <= slot) {
- tree_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
- tree_block_release(root, right_buffer);
+ } else {
+ free_extent_buffer(right);
+ }
+
BUG_ON(path->slots[0] < 0);
+
+ return ret;
+}
+
+/*
+ * split the path's leaf in two, making sure there is at least data_size
+ * available for the resulting leaf level of the path.
+ *
+ * returns 0 if all went well and < 0 on failure.
+ */
+static noinline int split_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *ins_key,
+ struct btrfs_path *path, int data_size,
+ int extend)
+{
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *l;
+ u32 nritems;
+ int mid;
+ int slot;
+ struct extent_buffer *right;
+ int ret = 0;
+ int wret;
+ int split;
+ int num_doubles = 0;
+
+ l = path->nodes[0];
+ slot = path->slots[0];
+ if (extend && data_size + btrfs_item_size_nr(l, slot) +
+ sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root))
+ return -EOVERFLOW;
+
+ /* first try to make some room by pushing left and right */
+ if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY) {
+ wret = push_leaf_right(trans, root, path, data_size, 0);
+ if (wret < 0)
+ return wret;
+ if (wret) {
+ wret = push_leaf_left(trans, root, path, data_size, 0);
+ if (wret < 0)
+ return wret;
+ }
+ l = path->nodes[0];
+
+ /* did the pushes work? */
+ if (btrfs_leaf_free_space(root, l) >= data_size)
+ return 0;
+ }
+
+ if (!path->nodes[1]) {
+ ret = insert_new_root(trans, root, path, 1);
+ if (ret)
+ return ret;
+ }
+again:
+ split = 1;
+ l = path->nodes[0];
+ slot = path->slots[0];
+ nritems = btrfs_header_nritems(l);
+ mid = (nritems + 1) / 2;
+
+ if (mid <= slot) {
+ if (nritems == 1 ||
+ leaf_space_used(l, mid, nritems - mid) + data_size >
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (slot >= nritems) {
+ split = 0;
+ } else {
+ mid = slot;
+ if (mid != nritems &&
+ leaf_space_used(l, mid, nritems - mid) +
+ data_size > BTRFS_LEAF_DATA_SIZE(root)) {
+ split = 2;
+ }
+ }
+ }
+ } else {
+ if (leaf_space_used(l, 0, mid) + data_size >
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (!extend && data_size && slot == 0) {
+ split = 0;
+ } else if ((extend || !data_size) && slot == 0) {
+ mid = 1;
+ } else {
+ mid = slot;
+ if (mid != nritems &&
+ leaf_space_used(l, mid, nritems - mid) +
+ data_size > BTRFS_LEAF_DATA_SIZE(root)) {
+ split = 2 ;
+ }
+ }
+ }
+ }
+
+ if (split == 0)
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ else
+ btrfs_item_key(l, &disk_key, mid);
+
+ right = btrfs_alloc_free_block(trans, root, root->leafsize,
+ root->root_key.objectid,
+ &disk_key, 0, l->start, 0);
+ if (IS_ERR(right)) {
+ BUG_ON(1);
+ return PTR_ERR(right);
+ }
+
+ memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(right, right->start);
+ btrfs_set_header_generation(right, trans->transid);
+ btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(right, root->root_key.objectid);
+ btrfs_set_header_level(right, 0);
+ write_extent_buffer(right, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(right),
+ BTRFS_UUID_SIZE);
+
+ if (split == 0) {
+ if (mid <= slot) {
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key, right->start,
+ 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;
+ } else {
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ right->start,
+ 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) {
+ btrfs_fixup_low_keys(root, path,
+ &disk_key, 1);
+ }
+ }
+ btrfs_mark_buffer_dirty(right);
+ return ret;
+ }
+
+ ret = copy_for_split(trans, root, path, l, right, slot, mid, nritems);
+ BUG_ON(ret);
+
+ if (split == 2) {
+ BUG_ON(num_doubles != 0);
+ num_doubles++;
+ goto again;
+ }
+
+ return ret;
+}
+
+/*
+ * This function splits a single item into two items,
+ * giving 'new_key' to the new item and splitting the
+ * old one at split_offset (from the start of the item).
+ *
+ * The path may be released by this operation. After
+ * the split, the path is pointing to the old item. The
+ * new item is going to be in the same node as the old one.
+ *
+ * Note, the item being split must be smaller enough to live alone on
+ * a tree block with room for one extra struct btrfs_item
+ *
+ * This allows us to split the item in place, keeping a lock on the
+ * leaf the entire time.
+ */
+int btrfs_split_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key,
+ unsigned long split_offset)
+{
+ u32 item_size;
+ struct extent_buffer *leaf;
+ struct btrfs_key orig_key;
+ struct btrfs_item *item;
+ struct btrfs_item *new_item;
+ int ret = 0;
+ int slot;
+ u32 nritems;
+ u32 orig_offset;
+ struct btrfs_disk_key disk_key;
+ char *buf;
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &orig_key, path->slots[0]);
+ if (btrfs_leaf_free_space(root, leaf) >= sizeof(struct btrfs_item))
+ goto split;
+
+ item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+ btrfs_release_path(path);
+
+ path->search_for_split = 1;
+
+ ret = btrfs_search_slot(trans, root, &orig_key, path, 0, 1);
+ path->search_for_split = 0;
+
+ /* if our item isn't there or got smaller, return now */
+ if (ret != 0 || item_size != btrfs_item_size_nr(path->nodes[0],
+ path->slots[0])) {
+ return -EAGAIN;
+ }
+
+ ret = split_leaf(trans, root, &orig_key, path, 0, 0);
+ BUG_ON(ret);
+
+ BUG_ON(btrfs_leaf_free_space(root, leaf) < sizeof(struct btrfs_item));
+ leaf = path->nodes[0];
+
+split:
+ item = btrfs_item_nr(path->slots[0]);
+ orig_offset = btrfs_item_offset(leaf, item);
+ item_size = btrfs_item_size(leaf, item);
+
+
+ buf = kmalloc(item_size, GFP_NOFS);
+ read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf,
+ path->slots[0]), item_size);
+ slot = path->slots[0] + 1;
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+
+ if (slot != nritems) {
+ /* shift the items */
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + 1),
+ btrfs_item_nr_offset(slot),
+ (nritems - slot) * sizeof(struct btrfs_item));
+
+ }
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(leaf, &disk_key, slot);
+
+ new_item = btrfs_item_nr(slot);
+
+ btrfs_set_item_offset(leaf, new_item, orig_offset);
+ btrfs_set_item_size(leaf, new_item, item_size - split_offset);
+
+ btrfs_set_item_offset(leaf, item,
+ orig_offset + item_size - split_offset);
+ btrfs_set_item_size(leaf, item, split_offset);
+
+ btrfs_set_header_nritems(leaf, nritems + 1);
+
+ /* write the data for the start of the original item */
+ write_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, path->slots[0]),
+ split_offset);
+
+ /* write the data for the new item */
+ write_extent_buffer(leaf, buf + split_offset,
+ btrfs_item_ptr_offset(leaf, slot),
+ item_size - split_offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ kfree(buf);
+ return ret;
+}
+
+int btrfs_truncate_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ u32 new_size, int from_end)
+{
+ int ret = 0;
+ int slot;
+ 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;
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+
+ old_size = btrfs_item_size_nr(leaf, slot);
+ if (old_size == new_size)
+ return 0;
+
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
+
+ old_data_start = btrfs_item_offset_nr(leaf, slot);
+
+ 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(i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + size_diff);
+ }
+
+ /* shift the data */
+ if (from_end) {
+ 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);
+ } else {
+ struct btrfs_disk_key disk_key;
+ u64 offset;
+
+ btrfs_item_key(leaf, &disk_key, slot);
+
+ if (btrfs_disk_key_type(&disk_key) == BTRFS_EXTENT_DATA_KEY) {
+ unsigned long ptr;
+ struct btrfs_file_extent_item *fi;
+
+ fi = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+ fi = (struct btrfs_file_extent_item *)(
+ (unsigned long)fi - size_diff);
+
+ if (btrfs_file_extent_type(leaf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE) {
+ ptr = btrfs_item_ptr_offset(leaf, slot);
+ memmove_extent_buffer(leaf, ptr,
+ (unsigned long)fi,
+ offsetof(struct btrfs_file_extent_item,
+ disk_bytenr));
+ }
+ }
+
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end + size_diff, btrfs_leaf_data(leaf) +
+ data_end, old_data_start - data_end);
+
+ offset = btrfs_disk_key_offset(&disk_key);
+ btrfs_set_disk_key_offset(&disk_key, offset + size_diff);
+ btrfs_set_item_key(leaf, &disk_key, slot);
+ if (slot == 0)
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
+ }
+
+ item = btrfs_item_nr(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();
+ }
+ 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;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ u32 nritems;
+ unsigned int data_end;
+ unsigned int old_data;
+ unsigned int old_size;
+ int i;
+
+ 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);
+ if (slot >= nritems) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d too large, nritems %d\n", slot, nritems);
+ BUG_ON(1);
+ }
+
+ /*
+ * 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(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(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();
+ }
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 insert_item(struct ctree_root *root, struct key *key,
- void *data, int data_size)
+int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *cpu_key, u32 *data_size,
+ int nr)
{
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
int ret = 0;
int slot;
- int slot_orig;
- struct leaf *leaf;
- struct tree_buffer *leaf_buf;
- unsigned int nritems;
+ int i;
+ u32 nritems;
+ u32 total_size = 0;
+ u32 total_data = 0;
unsigned int data_end;
- struct ctree_path path;
+ struct btrfs_disk_key disk_key;
+
+ for (i = 0; i < nr; i++) {
+ total_data += data_size[i];
+ }
/* create a root if there isn't one */
if (!root->node)
BUG();
- init_path(&path);
- ret = search_slot(root, key, &path, data_size, 1);
+
+ total_size = total_data + nr * sizeof(struct btrfs_item);
+ ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
if (ret == 0) {
- release_path(root, &path);
return -EEXIST;
}
if (ret < 0)
goto out;
- slot_orig = path.slots[0];
- leaf_buf = path.nodes[0];
- leaf = &leaf_buf->leaf;
+ leaf = path->nodes[0];
- nritems = leaf->header.nritems;
- data_end = leaf_data_end(leaf);
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
- if (leaf_free_space(leaf) < sizeof(struct item) + data_size)
+ if (btrfs_leaf_free_space(root, leaf) < total_size) {
+ btrfs_print_leaf(root, leaf);
+ printk("not enough freespace need %u have %d\n",
+ total_size, btrfs_leaf_free_space(root, leaf));
BUG();
+ }
- slot = path.slots[0];
+ slot = path->slots[0];
BUG_ON(slot < 0);
+
if (slot != nritems) {
- int i;
- unsigned int old_data = leaf->items[slot].offset +
- leaf->items[slot].size;
+ 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++)
- leaf->items[i].offset -= data_size;
+ for (i = slot; i < nritems; i++) {
+ u32 ioff;
+
+ item = btrfs_item_nr(i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff - total_data);
+ }
/* shift the items */
- memmove(leaf->items + slot + 1, leaf->items + slot,
- (nritems - slot) * sizeof(struct item));
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + nr),
+ btrfs_item_nr_offset(slot),
+ (nritems - slot) * sizeof(struct btrfs_item));
/* shift the data */
- memmove(leaf->data + data_end - data_size, leaf->data +
- data_end, old_data - data_end);
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end - total_data, btrfs_leaf_data(leaf) +
+ data_end, old_data - data_end);
data_end = old_data;
}
- /* copy the new data in */
- memcpy(&leaf->items[slot].key, key, sizeof(struct key));
- leaf->items[slot].offset = data_end - data_size;
- leaf->items[slot].size = data_size;
- memcpy(leaf->data + data_end - data_size, data, data_size);
- leaf->header.nritems += 1;
+
+ /* setup the item for the new data */
+ for (i = 0; i < nr; i++) {
+ btrfs_cpu_key_to_disk(&disk_key, cpu_key + i);
+ btrfs_set_item_key(leaf, &disk_key, slot + i);
+ item = btrfs_item_nr(slot + i);
+ btrfs_set_item_offset(leaf, item, data_end - data_size[i]);
+ data_end -= data_size[i];
+ btrfs_set_item_size(leaf, item, data_size[i]);
+ }
+ btrfs_set_header_nritems(leaf, nritems + nr);
+ btrfs_mark_buffer_dirty(leaf);
ret = 0;
- if (slot == 0)
- ret = fixup_low_keys(root, &path, key, 1);
+ if (slot == 0) {
+ btrfs_cpu_key_to_disk(&disk_key, cpu_key);
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
+ }
- BUG_ON(list_empty(&leaf_buf->dirty));
- if (leaf_free_space(leaf) < 0)
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
BUG();
- check_leaf(&path, 0);
+ }
+
out:
- release_path(root, &path);
+ return ret;
+}
+
+/*
+ * Given a key and some data, insert an item into the tree.
+ * This does all the path init required, making room in the tree if needed.
+ */
+int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_key *cpu_key, void *data, u32
+ data_size)
+{
+ int ret = 0;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ unsigned long ptr;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
+ if (!ret) {
+ 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_free_path(path);
return ret;
}
* continuing all the way the root if required. The root is converted into
* a leaf if all the nodes are emptied.
*/
-static int del_ptr(struct ctree_root *root, struct ctree_path *path, int level,
- int slot)
+int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_path *path, int level, int slot)
{
- struct node *node;
- struct tree_buffer *parent = path->nodes[level];
- int nritems;
+ struct extent_buffer *parent = path->nodes[level];
+ u32 nritems;
int ret = 0;
- int wret;
- node = &parent->node;
- nritems = node->header.nritems;
+ nritems = btrfs_header_nritems(parent);
if (slot != nritems -1) {
- memmove(node->keys + slot, node->keys + slot + 1,
- sizeof(struct key) * (nritems - slot - 1));
- memmove(node->blockptrs + slot,
- node->blockptrs + slot + 1,
- sizeof(u64) * (nritems - slot - 1));
- }
- node->header.nritems--;
- if (node->header.nritems == 0 && parent == root->node) {
- BUG_ON(node_level(root->node->node.header.flags) != 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(parent, nritems);
+ if (nritems == 0 && parent == root->node) {
+ BUG_ON(btrfs_header_level(root->node) != 1);
/* just turn the root into a leaf and break */
- root->node->node.header.flags = node_level(0);
+ btrfs_set_header_level(root->node, 0);
} else if (slot == 0) {
- wret = fixup_low_keys(root, path, node->keys, level + 1);
- if (wret)
- ret = wret;
+ struct btrfs_disk_key disk_key;
+
+ btrfs_node_key(parent, &disk_key, 0);
+ btrfs_fixup_low_keys(root, path, &disk_key, level + 1);
}
- BUG_ON(list_empty(&parent->dirty));
+ btrfs_mark_buffer_dirty(parent);
+ return ret;
+}
+
+/*
+ * a helper function to delete the leaf pointed to by path->slots[1] and
+ * path->nodes[1].
+ *
+ * This deletes the pointer in path->nodes[1] and frees the leaf
+ * block extent. zero is returned if it all worked out, < 0 otherwise.
+ *
+ * The path must have already been setup for deleting the leaf, including
+ * all the proper balancing. path->nodes[1] must be locked.
+ */
+static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct extent_buffer *leaf)
+{
+ int ret;
+
+ WARN_ON(btrfs_header_generation(leaf) != trans->transid);
+ ret = btrfs_del_ptr(trans, root, path, 1, path->slots[1]);
+ if (ret)
+ return ret;
+
+ ret = btrfs_free_extent(trans, root, leaf->start, leaf->len,
+ 0, root->root_key.objectid, 0, 0);
return ret;
}
* delete the item at the leaf level in path. If that empties
* the leaf, remove it from the tree
*/
-int del_item(struct ctree_root *root, struct ctree_path *path)
+int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_path *path, int slot, int nr)
{
- int slot;
- struct leaf *leaf;
- struct tree_buffer *leaf_buf;
- int doff;
- int dsize;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ int last_off;
+ int dsize = 0;
int ret = 0;
int wret;
+ int i;
+ u32 nritems;
+
+ leaf = path->nodes[0];
+ last_off = btrfs_item_offset_nr(leaf, slot + nr - 1);
+
+ for (i = 0; i < nr; i++)
+ dsize += btrfs_item_size_nr(leaf, slot + i);
+
+ nritems = btrfs_header_nritems(leaf);
+
+ if (slot + nr != nritems) {
+ int data_end = leaf_data_end(root, leaf);
+
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end + dsize,
+ btrfs_leaf_data(leaf) + data_end,
+ last_off - data_end);
+
+ for (i = slot + nr; i < nritems; i++) {
+ u32 ioff;
+
+ item = btrfs_item_nr(i);
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + dsize);
+ }
+
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot),
+ btrfs_item_nr_offset(slot + nr),
+ sizeof(struct btrfs_item) *
+ (nritems - slot - nr));
+ }
+ btrfs_set_header_nritems(leaf, nritems - nr);
+ nritems -= nr;
- leaf_buf = path->nodes[0];
- leaf = &leaf_buf->leaf;
- slot = path->slots[0];
- doff = leaf->items[slot].offset;
- dsize = leaf->items[slot].size;
-
- if (slot != leaf->header.nritems - 1) {
- int i;
- int data_end = leaf_data_end(leaf);
- memmove(leaf->data + data_end + dsize,
- leaf->data + data_end,
- doff - data_end);
- for (i = slot + 1; i < leaf->header.nritems; i++)
- leaf->items[i].offset += dsize;
- memmove(leaf->items + slot, leaf->items + slot + 1,
- sizeof(struct item) *
- (leaf->header.nritems - slot - 1));
- }
- leaf->header.nritems -= 1;
/* delete the leaf if we've emptied it */
- if (leaf->header.nritems == 0) {
- if (leaf_buf == root->node) {
- leaf->header.flags = node_level(0);
- BUG_ON(list_empty(&leaf_buf->dirty));
+ if (nritems == 0) {
+ if (leaf == root->node) {
+ btrfs_set_header_level(leaf, 0);
} else {
- clean_tree_block(root, leaf_buf);
- wret = del_ptr(root, path, 1, path->slots[1]);
- if (wret)
- ret = wret;
- wret = free_extent(root, leaf_buf->blocknr, 1);
+ clean_tree_block(trans, root, leaf);
+ wait_on_tree_block_writeback(root, leaf);
+
+ wret = btrfs_del_leaf(trans, root, path, leaf);
+ BUG_ON(ret);
if (wret)
ret = wret;
}
} else {
- int used = leaf_space_used(leaf, 0, leaf->header.nritems);
+ int used = leaf_space_used(leaf, 0, nritems);
if (slot == 0) {
- wret = fixup_low_keys(root, path,
- &leaf->items[0].key, 1);
- if (wret)
- ret = wret;
+ struct btrfs_disk_key disk_key;
+
+ btrfs_item_key(leaf, &disk_key, 0);
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
- BUG_ON(list_empty(&leaf_buf->dirty));
/* delete the leaf if it is mostly empty */
- if (used < LEAF_DATA_SIZE / 3) {
+ if (used < BTRFS_LEAF_DATA_SIZE(root) / 4) {
/* push_leaf_left fixes the path.
* make sure the path still points to our leaf
* for possible call to del_ptr below
*/
slot = path->slots[1];
- leaf_buf->count++;
- wret = push_leaf_left(root, path, 1);
- if (wret < 0)
+ extent_buffer_get(leaf);
+
+ wret = push_leaf_left(trans, root, path, 1, 1);
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
- if (path->nodes[0] == leaf_buf &&
- leaf->header.nritems) {
- wret = push_leaf_right(root, path, 1);
- if (wret < 0)
+
+ if (path->nodes[0] == leaf &&
+ btrfs_header_nritems(leaf)) {
+ wret = push_leaf_right(trans, root, path, 1, 1);
+ if (wret < 0 && wret != -ENOSPC)
ret = wret;
}
- if (leaf->header.nritems == 0) {
- u64 blocknr = leaf_buf->blocknr;
- clean_tree_block(root, leaf_buf);
- wret = del_ptr(root, path, 1, slot);
- if (wret)
- ret = wret;
- tree_block_release(root, leaf_buf);
- wret = free_extent(root, blocknr, 1);
- if (wret)
- ret = wret;
+
+ if (btrfs_header_nritems(leaf) == 0) {
+ clean_tree_block(trans, root, leaf);
+ wait_on_tree_block_writeback(root, leaf);
+
+ path->slots[1] = slot;
+ ret = btrfs_del_leaf(trans, root, path, leaf);
+ BUG_ON(ret);
+ free_extent_buffer(leaf);
+
} else {
- tree_block_release(root, leaf_buf);
+ btrfs_mark_buffer_dirty(leaf);
+ free_extent_buffer(leaf);
}
+ } else {
+ btrfs_mark_buffer_dirty(leaf);
}
}
return ret;
}
/*
+ * walk up the tree as far as required to find the previous leaf.
+ * returns 0 if it found something or 1 if there are no lesser leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
+{
+ int slot;
+ int level = 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+
+ while(level < BTRFS_MAX_LEVEL) {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level];
+ c = path->nodes[level];
+ if (slot == 0) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
+ continue;
+ }
+ slot--;
+
+ next = read_node_slot(root, c, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ break;
+ }
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ free_extent_buffer(c);
+ slot = btrfs_header_nritems(next);
+ if (slot != 0)
+ slot--;
+ path->nodes[level] = next;
+ path->slots[level] = slot;
+ if (!level)
+ break;
+ next = read_node_slot(root, next, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+/*
* walk up the tree as far as required to find the next leaf.
* returns 0 if it found something or 1 if there are no greater leaves.
* returns < 0 on io errors.
*/
-int next_leaf(struct ctree_root *root, struct ctree_path *path)
+int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
int slot;
int level = 1;
- u64 blocknr;
- struct tree_buffer *c;
- struct tree_buffer *next = NULL;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
- while(level < MAX_LEVEL) {
+ while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
return 1;
+
slot = path->slots[level] + 1;
c = path->nodes[level];
- if (slot >= c->node.header.nritems) {
+ if (slot >= btrfs_header_nritems(c)) {
level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
continue;
}
- blocknr = c->node.blockptrs[slot];
- if (next)
- tree_block_release(root, next);
- next = read_tree_block(root, blocknr);
+
+ if (path->reada)
+ reada_for_search(root, path, level, slot, 0);
+
+ next = read_node_slot(root, c, slot);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
break;
}
path->slots[level] = slot;
while(1) {
level--;
c = path->nodes[level];
- tree_block_release(root, c);
+ free_extent_buffer(c);
path->nodes[level] = next;
path->slots[level] = 0;
if (!level)
break;
- next = read_tree_block(root, next->node.blockptrs[0]);
+ if (path->reada)
+ reada_for_search(root, path, level, 0, 0);
+ next = read_node_slot(root, next, 0);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
}
return 0;
}
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ int ret;
+
+ while(1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.type == type)
+ return 0;
+ }
+ return 1;
+}
+/*
+ * search in extent tree to find a previous Metadata/Data extent item with
+ * min objecitd.
+ *
+ * returns 0 if something is found, 1 if nothing was found and < 0 on error
+ */
+int btrfs_previous_extent_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+
+ while (1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (nritems == 0)
+ return 1;
+ if (path->slots[0] == nritems)
+ path->slots[0]--;
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid < min_objectid)
+ break;
+ if (found_key.type == BTRFS_EXTENT_ITEM_KEY ||
+ found_key.type == BTRFS_METADATA_ITEM_KEY)
+ return 0;
+ if (found_key.objectid == min_objectid &&
+ found_key.type < BTRFS_EXTENT_ITEM_KEY)
+ break;
+ }
+ return 1;
+}
projects / platform / upstream / btrfs-progs.git / blobdiff