-#include <stdio.h>
-#include <stdlib.h>
-#include "kerncompat.h"
-
-#define BLOCKSIZE 4096
-
-struct key {
- u64 objectid;
- u32 flags;
- u64 offset;
-} __attribute__ ((__packed__));
-
-struct header {
- u64 fsid[2]; /* FS specific uuid */
- u64 blocknum;
- u64 parentid;
- u32 csum;
- u32 ham;
- u16 nritems;
- u16 flags;
-} __attribute__ ((__packed__));
-
-#define NODEPTRS_PER_BLOCK ((BLOCKSIZE - sizeof(struct header)) / \
- (sizeof(struct key) + sizeof(u64)))
-
-#define LEVEL_BITS 3
-#define MAX_LEVEL (1 << LEVEL_BITS)
-#define node_level(f) ((f) & (MAX_LEVEL-1))
-#define is_leaf(f) (node_level(f) == 0)
-
-struct ctree_root {
- struct node *node;
-};
-
-struct item {
- struct key key;
- u16 offset;
- u16 size;
-} __attribute__ ((__packed__));
-
-#define LEAF_DATA_SIZE (BLOCKSIZE - sizeof(struct header))
-struct leaf {
- struct header header;
- union {
- struct item items[LEAF_DATA_SIZE/sizeof(struct item)];
- u8 data[BLOCKSIZE-sizeof(struct header)];
- };
-} __attribute__ ((__packed__));
-
-struct node {
- struct header header;
- struct key keys[NODEPTRS_PER_BLOCK];
- u64 blockptrs[NODEPTRS_PER_BLOCK];
-} __attribute__ ((__packed__));
-
-struct ctree_path {
- struct node *nodes[MAX_LEVEL];
- int slots[MAX_LEVEL];
-};
-
-static inline void init_path(struct ctree_path *p)
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/sched.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "print-tree.h"
+#include "locking.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);
+static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_path *path, int level, int slot);
+
+inline void btrfs_init_path(struct btrfs_path *p)
{
memset(p, 0, sizeof(*p));
}
-static inline unsigned int leaf_data_end(struct leaf *leaf)
+struct btrfs_path *btrfs_alloc_path(void)
{
- unsigned int nr = leaf->header.nritems;
- if (nr == 0)
- return ARRAY_SIZE(leaf->data);
- return leaf->items[nr-1].offset;
+ struct btrfs_path *path;
+ path = kmem_cache_alloc(btrfs_path_cachep, GFP_NOFS);
+ if (path) {
+ btrfs_init_path(path);
+ path->reada = 1;
+ }
+ return path;
+}
+
+void btrfs_free_path(struct btrfs_path *p)
+{
+ btrfs_release_path(NULL, p);
+ kmem_cache_free(btrfs_path_cachep, p);
+}
+
+void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
+{
+ int i;
+ int keep = p->keep_locks;
+ int skip = p->skip_locking;
+
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (!p->nodes[i])
+ continue;
+ if (p->locks[i]) {
+ btrfs_tree_unlock(p->nodes[i]);
+ p->locks[i] = 0;
+ }
+ free_extent_buffer(p->nodes[i]);
+ }
+ memset(p, 0, sizeof(*p));
+ p->keep_locks = keep;
+ p->skip_locking = skip;
+}
+
+struct extent_buffer *btrfs_root_node(struct btrfs_root *root)
+{
+ struct extent_buffer *eb;
+ spin_lock(&root->node_lock);
+ eb = root->node;
+ extent_buffer_get(eb);
+ spin_unlock(&root->node_lock);
+ return eb;
+}
+
+struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root)
+{
+ struct extent_buffer *eb;
+
+ while(1) {
+ eb = btrfs_root_node(root);
+ btrfs_tree_lock(eb);
+
+ spin_lock(&root->node_lock);
+ if (eb == root->node) {
+ spin_unlock(&root->node_lock);
+ break;
+ }
+ spin_unlock(&root->node_lock);
+
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+ }
+ return eb;
+}
+
+static 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 extent_buffer *cow;
+ u32 nritems;
+ int ret = 0;
+ int level;
+ struct btrfs_key first_key;
+ struct btrfs_root *new_root;
+
+ 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);
+ nritems = btrfs_header_nritems(buf);
+ if (nritems) {
+ if (level == 0)
+ btrfs_item_key_to_cpu(buf, &first_key, 0);
+ else
+ btrfs_node_key_to_cpu(buf, &first_key, 0);
+ } else {
+ first_key.objectid = 0;
+ }
+ cow = btrfs_alloc_free_block(trans, new_root, buf->len,
+ new_root_objectid,
+ trans->transid, first_key.objectid,
+ level, buf->start, 0);
+ if (IS_ERR(cow)) {
+ kfree(new_root);
+ 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_owner(cow, new_root_objectid);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
+
+ WARN_ON(btrfs_header_generation(buf) > trans->transid);
+ ret = btrfs_inc_ref(trans, new_root, buf);
+ kfree(new_root);
+
+ if (ret)
+ return ret;
+
+ btrfs_mark_buffer_dirty(cow);
+ *cow_ret = cow;
+ return 0;
+}
+
+int __btrfs_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer *parent, int parent_slot,
+ struct extent_buffer **cow_ret,
+ u64 search_start, u64 empty_size)
+{
+ u64 root_gen;
+ struct extent_buffer *cow;
+ u32 nritems;
+ int ret = 0;
+ int different_trans = 0;
+ int level;
+ int unlock_orig = 0;
+ struct btrfs_key first_key;
+
+ if (*cow_ret == buf)
+ unlock_orig = 1;
+
+ WARN_ON(!btrfs_tree_locked(buf));
+
+ if (root->ref_cows) {
+ root_gen = trans->transid;
+ } else {
+ root_gen = 0;
+ }
+ 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);
+ nritems = btrfs_header_nritems(buf);
+ if (nritems) {
+ if (level == 0)
+ btrfs_item_key_to_cpu(buf, &first_key, 0);
+ else
+ btrfs_node_key_to_cpu(buf, &first_key, 0);
+ } else {
+ first_key.objectid = 0;
+ }
+ cow = btrfs_alloc_free_block(trans, root, buf->len,
+ root->root_key.objectid,
+ root_gen, first_key.objectid, 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_owner(cow, root->root_key.objectid);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
+
+ WARN_ON(btrfs_header_generation(buf) > trans->transid);
+ if (btrfs_header_generation(buf) != trans->transid) {
+ different_trans = 1;
+ ret = btrfs_inc_ref(trans, root, buf);
+ if (ret)
+ return ret;
+ } else {
+ clean_tree_block(trans, root, buf);
+ }
+
+ if (buf == root->node) {
+ WARN_ON(parent && parent != buf);
+ root_gen = btrfs_header_generation(buf);
+
+ spin_lock(&root->node_lock);
+ root->node = cow;
+ extent_buffer_get(cow);
+ spin_unlock(&root->node_lock);
+
+ if (buf != root->commit_root) {
+ btrfs_free_extent(trans, root, buf->start,
+ buf->len, root->root_key.objectid,
+ root_gen, 0, 0, 1);
+ }
+ free_extent_buffer(buf);
+ add_root_to_dirty_list(root);
+ } else {
+ root_gen = btrfs_header_generation(parent);
+ 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,
+ btrfs_header_owner(parent), root_gen,
+ 0, 0, 1);
+ }
+ if (unlock_orig)
+ btrfs_tree_unlock(buf);
+ free_extent_buffer(buf);
+ btrfs_mark_buffer_dirty(cow);
+ *cow_ret = cow;
+ return 0;
+}
+
+int btrfs_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *buf,
+ struct extent_buffer *parent, int parent_slot,
+ struct extent_buffer **cow_ret)
+{
+ u64 search_start;
+ u64 header_trans;
+ 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 %Lu running %Lu\n", trans->transid,
+ root->fs_info->generation);
+ WARN_ON(1);
+ }
+
+ header_trans = btrfs_header_generation(buf);
+ spin_lock(&root->fs_info->hash_lock);
+ if (header_trans == trans->transid &&
+ !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
+ *cow_ret = buf;
+ spin_unlock(&root->fs_info->hash_lock);
+ return 0;
+ }
+ spin_unlock(&root->fs_info->hash_lock);
+ 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;
}
-static inline int leaf_free_space(struct leaf *leaf)
+static int close_blocks(u64 blocknr, u64 other, u32 blocksize)
{
- 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;
+ if (blocknr < other && other - (blocknr + blocksize) < 32768)
+ return 1;
+ if (blocknr > other && blocknr - (other + blocksize) < 32768)
+ return 1;
+ return 0;
}
-int comp_keys(struct key *k1, struct key *k2)
+/*
+ * compare two keys in a memcmp fashion
+ */
+static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
{
- if (k1->objectid > k2->objectid)
+ struct btrfs_key k1;
+
+ btrfs_disk_key_to_cpu(&k1, disk);
+
+ if (k1.objectid > k2->objectid)
return 1;
- if (k1->objectid < k2->objectid)
+ 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)
+ if (k1.offset > k2->offset)
return 1;
- if (k1->offset < k2->offset)
+ if (k1.offset < k2->offset)
return -1;
return 0;
}
-int generic_bin_search(char *p, int item_size, struct key *key,
- int max, int *slot)
+
+
+int btrfs_realloc_node(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *parent,
+ int start_slot, int cache_only, u64 *last_ret,
+ struct btrfs_key *progress)
+{
+ struct extent_buffer *cur;
+ struct extent_buffer *tmp;
+ u64 blocknr;
+ u64 gen;
+ u64 search_start = *last_ret;
+ u64 last_block = 0;
+ u64 other;
+ u32 parent_nritems;
+ int end_slot;
+ int i;
+ int err = 0;
+ int parent_level;
+ int uptodate;
+ u32 blocksize;
+ int progress_passed = 0;
+ struct btrfs_disk_key disk_key;
+
+ /* FIXME this code needs locking */
+ return 0;
+
+ parent_level = btrfs_header_level(parent);
+ if (cache_only && parent_level != 1)
+ return 0;
+
+ if (trans->transaction != root->fs_info->running_transaction) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->running_transaction->transid);
+ WARN_ON(1);
+ }
+ if (trans->transid != root->fs_info->generation) {
+ printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
+ root->fs_info->generation);
+ WARN_ON(1);
+ }
+
+ parent_nritems = btrfs_header_nritems(parent);
+ blocksize = btrfs_level_size(root, parent_level - 1);
+ end_slot = parent_nritems;
+
+ if (parent_nritems == 1)
+ return 0;
+
+ for (i = start_slot; i < end_slot; i++) {
+ int close = 1;
+
+ if (!parent->map_token) {
+ map_extent_buffer(parent,
+ btrfs_node_key_ptr_offset(i),
+ sizeof(struct btrfs_key_ptr),
+ &parent->map_token, &parent->kaddr,
+ &parent->map_start, &parent->map_len,
+ KM_USER1);
+ }
+ btrfs_node_key(parent, &disk_key, i);
+ if (!progress_passed && comp_keys(&disk_key, progress) < 0)
+ continue;
+
+ progress_passed = 1;
+ blocknr = btrfs_node_blockptr(parent, i);
+ gen = btrfs_node_ptr_generation(parent, i);
+ if (last_block == 0)
+ last_block = blocknr;
+
+ if (i > 0) {
+ other = btrfs_node_blockptr(parent, i - 1);
+ close = close_blocks(blocknr, other, blocksize);
+ }
+ if (!close && i < end_slot - 2) {
+ other = btrfs_node_blockptr(parent, i + 1);
+ close = close_blocks(blocknr, other, blocksize);
+ }
+ if (close) {
+ last_block = blocknr;
+ continue;
+ }
+ if (parent->map_token) {
+ unmap_extent_buffer(parent, parent->map_token,
+ KM_USER1);
+ parent->map_token = NULL;
+ }
+
+ cur = btrfs_find_tree_block(root, blocknr, blocksize);
+ if (cur)
+ uptodate = btrfs_buffer_uptodate(cur, gen);
+ else
+ uptodate = 0;
+ if (!cur || !uptodate) {
+ if (cache_only) {
+ free_extent_buffer(cur);
+ continue;
+ }
+ if (!cur) {
+ cur = read_tree_block(root, blocknr,
+ blocksize, gen);
+ } else if (!uptodate) {
+ btrfs_read_buffer(cur, gen);
+ }
+ }
+ if (search_start == 0)
+ search_start = last_block;
+
+ err = __btrfs_cow_block(trans, root, cur, parent, i,
+ &tmp, search_start,
+ min(16 * blocksize,
+ (end_slot - i) * blocksize));
+ if (err) {
+ free_extent_buffer(cur);
+ break;
+ }
+ search_start = tmp->start;
+ last_block = tmp->start;
+ *last_ret = search_start;
+ if (parent_level == 1)
+ btrfs_clear_buffer_defrag(tmp);
+ free_extent_buffer(tmp);
+ }
+ if (parent->map_token) {
+ unmap_extent_buffer(parent, parent->map_token,
+ KM_USER1);
+ parent->map_token = NULL;
+ }
+ return err;
+}
+
+/*
+ * 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);
+}
+
+static int check_node(struct btrfs_root *root, struct btrfs_path *path,
+ int level)
+{
+ struct extent_buffer *parent = NULL;
+ struct extent_buffer *node = path->nodes[level];
+ struct btrfs_disk_key parent_key;
+ struct btrfs_disk_key node_key;
+ int parent_slot;
+ int slot;
+ struct btrfs_key cpukey;
+ u32 nritems = btrfs_header_nritems(node);
+
+ if (path->nodes[level + 1])
+ parent = path->nodes[level + 1];
+
+ slot = path->slots[level];
+ BUG_ON(nritems == 0);
+ if (parent) {
+ parent_slot = path->slots[level + 1];
+ btrfs_node_key(parent, &parent_key, parent_slot);
+ btrfs_node_key(node, &node_key, 0);
+ BUG_ON(memcmp(&parent_key, &node_key,
+ sizeof(struct btrfs_disk_key)));
+ BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
+ btrfs_header_bytenr(node));
+ }
+ BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root));
+ if (slot != 0) {
+ btrfs_node_key_to_cpu(node, &cpukey, slot - 1);
+ btrfs_node_key(node, &node_key, slot);
+ BUG_ON(comp_keys(&node_key, &cpukey) <= 0);
+ }
+ if (slot < nritems - 1) {
+ btrfs_node_key_to_cpu(node, &cpukey, slot + 1);
+ btrfs_node_key(node, &node_key, slot);
+ BUG_ON(comp_keys(&node_key, &cpukey) >= 0);
+ }
+ return 0;
+}
+
+static int check_leaf(struct btrfs_root *root, struct btrfs_path *path,
+ int level)
+{
+ struct extent_buffer *leaf = path->nodes[level];
+ struct extent_buffer *parent = NULL;
+ int parent_slot;
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key parent_key;
+ struct btrfs_disk_key leaf_key;
+ int slot = path->slots[0];
+
+ u32 nritems = btrfs_header_nritems(leaf);
+
+ if (path->nodes[level + 1])
+ parent = path->nodes[level + 1];
+
+ if (nritems == 0)
+ return 0;
+
+ if (parent) {
+ parent_slot = path->slots[level + 1];
+ btrfs_node_key(parent, &parent_key, parent_slot);
+ btrfs_item_key(leaf, &leaf_key, 0);
+
+ BUG_ON(memcmp(&parent_key, &leaf_key,
+ sizeof(struct btrfs_disk_key)));
+ BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
+ btrfs_header_bytenr(leaf));
+ }
+#if 0
+ for (i = 0; nritems > 1 && i < nritems - 2; i++) {
+ btrfs_item_key_to_cpu(leaf, &cpukey, i + 1);
+ btrfs_item_key(leaf, &leaf_key, i);
+ if (comp_keys(&leaf_key, &cpukey) >= 0) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad key\n", i);
+ BUG_ON(1);
+ }
+ if (btrfs_item_offset_nr(leaf, i) !=
+ btrfs_item_end_nr(leaf, i + 1)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", i);
+ BUG_ON(1);
+ }
+ if (i == 0) {
+ if (btrfs_item_offset_nr(leaf, i) +
+ btrfs_item_size_nr(leaf, i) !=
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d first offset bad\n", i);
+ BUG_ON(1);
+ }
+ }
+ }
+ if (nritems > 0) {
+ if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d bad size \n", nritems - 1);
+ BUG_ON(1);
+ }
+ }
+#endif
+ if (slot != 0 && slot < nritems - 1) {
+ btrfs_item_key(leaf, &leaf_key, slot);
+ btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1);
+ if (comp_keys(&leaf_key, &cpukey) <= 0) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad key\n", slot);
+ BUG_ON(1);
+ }
+ if (btrfs_item_offset_nr(leaf, slot - 1) !=
+ btrfs_item_end_nr(leaf, slot)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", slot);
+ BUG_ON(1);
+ }
+ }
+ if (slot < nritems - 1) {
+ btrfs_item_key(leaf, &leaf_key, slot);
+ btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1);
+ BUG_ON(comp_keys(&leaf_key, &cpukey) >= 0);
+ if (btrfs_item_offset_nr(leaf, slot) !=
+ btrfs_item_end_nr(leaf, slot + 1)) {
+ btrfs_print_leaf(root, leaf);
+ printk("slot %d offset bad\n", slot);
+ BUG_ON(1);
+ }
+ }
+ BUG_ON(btrfs_item_offset_nr(leaf, 0) +
+ btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root));
+ return 0;
+}
+
+static int noinline check_block(struct btrfs_root *root,
+ struct btrfs_path *path, int level)
+{
+ u64 found_start;
+ return 0;
+ if (btrfs_header_level(path->nodes[level]) != level)
+ printk("warning: bad level %Lu wanted %d found %d\n",
+ path->nodes[level]->start, level,
+ btrfs_header_level(path->nodes[level]));
+ found_start = btrfs_header_bytenr(path->nodes[level]);
+ if (found_start != path->nodes[level]->start) {
+ printk("warning: bad bytentr %Lu found %Lu\n",
+ path->nodes[level]->start, found_start);
+ }
+#if 0
+ struct extent_buffer *buf = path->nodes[level];
+
+ if (memcmp_extent_buffer(buf, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(buf),
+ BTRFS_FSID_SIZE)) {
+ printk("warning bad block %Lu\n", buf->start);
+ return 1;
+ }
+#endif
+ if (level == 0)
+ return check_leaf(root, path, level);
+ return check_node(root, path, level);
+}
+
+/*
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
+ * the slot in the array is returned via slot, and it points to
+ * the place where you would insert key if it is not found in
+ * the array.
+ *
+ * slot may point to max if the key is bigger than all of the keys
+ */
+static int generic_bin_search(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;
+ struct btrfs_disk_key *tmp = NULL;
+ struct btrfs_disk_key unaligned;
+ unsigned long offset;
+ char *map_token = NULL;
+ char *kaddr = NULL;
+ unsigned long map_start = 0;
+ unsigned long map_len = 0;
+ int err;
while(low < high) {
mid = (low + high) / 2;
- tmp = (struct key *)(p + mid * item_size);
+ offset = p + mid * item_size;
+
+ if (!map_token || offset < map_start ||
+ (offset + sizeof(struct btrfs_disk_key)) >
+ map_start + map_len) {
+ if (map_token) {
+ unmap_extent_buffer(eb, map_token, KM_USER0);
+ map_token = NULL;
+ }
+ err = map_extent_buffer(eb, offset,
+ sizeof(struct btrfs_disk_key),
+ &map_token, &kaddr,
+ &map_start, &map_len, KM_USER0);
+
+ if (!err) {
+ tmp = (struct btrfs_disk_key *)(kaddr + offset -
+ map_start);
+ } else {
+ read_extent_buffer(eb, &unaligned,
+ offset, sizeof(unaligned));
+ tmp = &unaligned;
+ }
+
+ } else {
+ tmp = (struct btrfs_disk_key *)(kaddr + offset -
+ map_start);
+ }
ret = comp_keys(tmp, key);
if (ret < 0)
high = mid;
else {
*slot = mid;
+ if (map_token)
+ unmap_extent_buffer(eb, map_token, KM_USER0);
return 0;
}
}
*slot = low;
+ if (map_token)
+ unmap_extent_buffer(eb, map_token, KM_USER0);
return 1;
}
-int bin_search(struct node *c, struct key *key, int *slot)
+/*
+ * simple bin_search frontend that does the right thing for
+ * leaves vs nodes
+ */
+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);
+ 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((void *)c->keys, sizeof(struct key),
- key, c->header.nritems, slot);
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
+ sizeof(struct btrfs_key_ptr),
+ key, btrfs_header_nritems(eb),
+ slot);
}
return -1;
}
-void *read_block(u64 blocknum)
+static struct extent_buffer *read_node_slot(struct btrfs_root *root,
+ struct extent_buffer *parent, int slot)
{
- return (void *)blocknum;
+ int level = btrfs_header_level(parent);
+ if (slot < 0)
+ return NULL;
+ if (slot >= btrfs_header_nritems(parent))
+ return NULL;
+
+ BUG_ON(level == 0);
+
+ return read_tree_block(root, btrfs_node_blockptr(parent, slot),
+ btrfs_level_size(root, level - 1),
+ btrfs_node_ptr_generation(parent, slot));
}
-int search_slot(struct ctree_root *root, struct key *key, struct ctree_path *p)
+static int balance_level(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
{
- struct node *c = root->node;
+ struct extent_buffer *right = NULL;
+ struct extent_buffer *mid;
+ struct extent_buffer *left = NULL;
+ struct extent_buffer *parent = NULL;
+ int ret = 0;
+ int wret;
+ int pslot;
+ int orig_slot = path->slots[level];
+ int err_on_enospc = 0;
+ u64 orig_ptr;
+
+ if (level == 0)
+ return 0;
+
+ mid = path->nodes[level];
+ WARN_ON(!path->locks[level]);
+ WARN_ON(btrfs_header_generation(mid) != trans->transid);
+
+ orig_ptr = btrfs_node_blockptr(mid, orig_slot);
+
+ 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 (btrfs_header_nritems(mid) != 1)
+ return 0;
+
+ /* promote the child to a root */
+ child = read_node_slot(root, mid, 0);
+ btrfs_tree_lock(child);
+ BUG_ON(!child);
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
+ BUG_ON(ret);
+
+ spin_lock(&root->node_lock);
+ root->node = child;
+ spin_unlock(&root->node_lock);
+
+ add_root_to_dirty_list(root);
+ btrfs_tree_unlock(child);
+ path->locks[level] = 0;
+ path->nodes[level] = NULL;
+ clean_tree_block(trans, root, mid);
+ btrfs_tree_unlock(mid);
+ /* once for the path */
+ free_extent_buffer(mid);
+ ret = btrfs_free_extent(trans, root, mid->start, mid->len,
+ root->root_key.objectid,
+ btrfs_header_generation(mid), 0, 0, 1);
+ /* once for the root ptr */
+ free_extent_buffer(mid);
+ return ret;
+ }
+ if (btrfs_header_nritems(mid) >
+ BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
+ return 0;
+
+ if (btrfs_header_nritems(mid) < 2)
+ err_on_enospc = 1;
+
+ left = read_node_slot(root, parent, pslot - 1);
+ if (left) {
+ btrfs_tree_lock(left);
+ wret = btrfs_cow_block(trans, root, left,
+ parent, pslot - 1, &left);
+ if (wret) {
+ ret = wret;
+ goto enospc;
+ }
+ }
+ right = read_node_slot(root, parent, pslot + 1);
+ if (right) {
+ btrfs_tree_lock(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) {
+ orig_slot += btrfs_header_nritems(left);
+ wret = push_node_left(trans, root, left, mid, 1);
+ if (wret < 0)
+ ret = wret;
+ if (btrfs_header_nritems(mid) < 2)
+ err_on_enospc = 1;
+ }
+
+ /*
+ * then try to empty the right most buffer into the middle
+ */
+ if (right) {
+ wret = push_node_left(trans, root, mid, right, 1);
+ if (wret < 0 && wret != -ENOSPC)
+ ret = wret;
+ if (btrfs_header_nritems(right) == 0) {
+ u64 bytenr = right->start;
+ u64 generation = btrfs_header_generation(parent);
+ u32 blocksize = right->len;
+
+ clean_tree_block(trans, root, right);
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ right = NULL;
+ wret = del_ptr(trans, root, path, level + 1, pslot +
+ 1);
+ if (wret)
+ ret = wret;
+ wret = btrfs_free_extent(trans, root, bytenr,
+ blocksize,
+ btrfs_header_owner(parent),
+ generation, 0, 0, 1);
+ if (wret)
+ ret = wret;
+ } else {
+ struct btrfs_disk_key right_key;
+ btrfs_node_key(right, &right_key, 0);
+ btrfs_set_node_key(parent, &right_key, pslot + 1);
+ btrfs_mark_buffer_dirty(parent);
+ }
+ }
+ if (btrfs_header_nritems(mid) == 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
+ * could try to delete the only pointer in this node.
+ * So, pull some keys from the left.
+ * There has to be a left pointer at this point because
+ * otherwise we would have pulled some pointers from the
+ * right
+ */
+ 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 (btrfs_header_nritems(mid) == 0) {
+ /* we've managed to empty the middle node, drop it */
+ u64 root_gen = btrfs_header_generation(parent);
+ u64 bytenr = mid->start;
+ u32 blocksize = mid->len;
+
+ clean_tree_block(trans, root, mid);
+ btrfs_tree_unlock(mid);
+ free_extent_buffer(mid);
+ mid = NULL;
+ wret = del_ptr(trans, root, path, level + 1, pslot);
+ if (wret)
+ ret = wret;
+ wret = btrfs_free_extent(trans, root, bytenr, blocksize,
+ btrfs_header_owner(parent),
+ root_gen, 0, 0, 1);
+ if (wret)
+ ret = wret;
+ } else {
+ /* update the parent key to reflect our changes */
+ 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) {
+ if (btrfs_header_nritems(left) > orig_slot) {
+ extent_buffer_get(left);
+ /* left was locked after cow */
+ path->nodes[level] = left;
+ path->slots[level + 1] -= 1;
+ path->slots[level] = orig_slot;
+ if (mid) {
+ btrfs_tree_unlock(mid);
+ free_extent_buffer(mid);
+ }
+ } else {
+ orig_slot -= btrfs_header_nritems(left);
+ path->slots[level] = orig_slot;
+ }
+ }
+ /* double check we haven't messed things up */
+ check_block(root, path, level);
+ if (orig_ptr !=
+ btrfs_node_blockptr(path->nodes[level], path->slots[level]))
+ BUG();
+enospc:
+ if (right) {
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+ if (left) {
+ if (path->nodes[level] != left)
+ btrfs_tree_unlock(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];
+ u64 orig_ptr;
+
+ if (level == 0)
+ return 1;
+
+ mid = path->nodes[level];
+ WARN_ON(btrfs_header_generation(mid) != trans->transid);
+ orig_ptr = btrfs_node_blockptr(mid, orig_slot);
+
+ if (level < BTRFS_MAX_LEVEL - 1)
+ parent = path->nodes[level + 1];
+ pslot = path->slots[level + 1];
+
+ if (!parent)
+ return 1;
+
+ left = read_node_slot(root, parent, pslot - 1);
+
+ /* first, try to make some room in the middle buffer */
+ if (left) {
+ u32 left_nr;
+
+ btrfs_tree_lock(left);
+ 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;
+ btrfs_tree_unlock(mid);
+ free_extent_buffer(mid);
+ } else {
+ orig_slot -=
+ btrfs_header_nritems(left);
+ path->slots[level] = orig_slot;
+ btrfs_tree_unlock(left);
+ free_extent_buffer(left);
+ }
+ return 0;
+ }
+ btrfs_tree_unlock(left);
+ free_extent_buffer(left);
+ }
+ right = read_node_slot(root, parent, pslot + 1);
+
+ /*
+ * then try to empty the right most buffer into the middle
+ */
+ if (right) {
+ u32 right_nr;
+ btrfs_tree_lock(right);
+ 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);
+ btrfs_tree_unlock(mid);
+ free_extent_buffer(mid);
+ } else {
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+ return 0;
+ }
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+ return 1;
+}
+
+/*
+ * readahead one full node of leaves
+ */
+static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
+ int level, int slot, 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;
+ }
+}
+
+static void unlock_up(struct btrfs_path *path, int level, int lowest_unlock)
+{
+ int i;
+ int skip_level = level;
+ int no_skips = 0;
+ struct extent_buffer *t;
+
+ for (i = level; i < BTRFS_MAX_LEVEL; i++) {
+ if (!path->nodes[i])
+ break;
+ if (!path->locks[i])
+ break;
+ if (!no_skips && path->slots[i] == 0) {
+ skip_level = i + 1;
+ continue;
+ }
+ if (!no_skips && path->keep_locks) {
+ u32 nritems;
+ t = path->nodes[i];
+ nritems = btrfs_header_nritems(t);
+ if (nritems < 1 || path->slots[i] >= nritems - 1) {
+ skip_level = i + 1;
+ continue;
+ }
+ }
+ if (skip_level < i && i >= lowest_unlock)
+ no_skips = 1;
+
+ t = path->nodes[i];
+ if (i >= lowest_unlock && i > skip_level && path->locks[i]) {
+ btrfs_tree_unlock(t);
+ path->locks[i] = 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
+ * level of the path (level 0)
+ *
+ * If the key isn't found, the path points to the slot where it should
+ * be inserted, and 1 is returned. If there are other errors during the
+ * search a negative error number is returned.
+ *
+ * if ins_len > 0, nodes and leaves will be split as we walk down the
+ * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if
+ * possible)
+ */
+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 extent_buffer *b;
+ struct extent_buffer *tmp;
int slot;
int ret;
int level;
- while (c) {
- level = node_level(c->header.flags);
- p->nodes[level] = c;
- ret = bin_search(c, key, &slot);
- if (!is_leaf(c->header.flags)) {
+ int should_reada = p->reada;
+ int lowest_unlock = 1;
+ int blocksize;
+ u8 lowest_level = 0;
+ u64 blocknr;
+ u64 gen;
+
+ lowest_level = p->lowest_level;
+ WARN_ON(lowest_level && ins_len);
+ WARN_ON(p->nodes[0] != NULL);
+ WARN_ON(cow && root == root->fs_info->extent_root &&
+ !mutex_is_locked(&root->fs_info->alloc_mutex));
+ WARN_ON(root == root->fs_info->chunk_root &&
+ !mutex_is_locked(&root->fs_info->chunk_mutex));
+ WARN_ON(root == root->fs_info->dev_root &&
+ !mutex_is_locked(&root->fs_info->chunk_mutex));
+ if (ins_len < 0)
+ lowest_unlock = 2;
+again:
+ if (p->skip_locking)
+ b = btrfs_root_node(root);
+ else
+ b = btrfs_lock_root_node(root);
+
+ while (b) {
+ level = btrfs_header_level(b);
+ if (cow) {
+ int wret;
+ 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);
+ if (level != btrfs_header_level(b))
+ WARN_ON(1);
+ level = btrfs_header_level(b);
+ p->nodes[level] = b;
+ if (!p->skip_locking)
+ p->locks[level] = 1;
+ ret = check_block(root, p, level);
+ if (ret)
+ return -1;
+
+ ret = bin_search(b, key, level, &slot);
+ if (level != 0) {
if (ret && slot > 0)
slot -= 1;
p->slots[level] = slot;
- c = read_block(c->blockptrs[slot]);
- continue;
+ if (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];
+ slot = p->slots[level];
+ } else if (ins_len < 0) {
+ int sret = balance_level(trans, root, p,
+ level);
+ if (sret)
+ return sret;
+ b = p->nodes[level];
+ if (!b) {
+ btrfs_release_path(NULL, p);
+ goto again;
+ }
+ slot = p->slots[level];
+ BUG_ON(btrfs_header_nritems(b) == 1);
+ }
+ /* this is only true while dropping a snapshot */
+ if (level == lowest_level) {
+ unlock_up(p, level, lowest_unlock);
+ break;
+ }
+
+ if (should_reada)
+ reada_for_search(root, p, level, slot,
+ key->objectid);
+
+ blocknr = btrfs_node_blockptr(b, slot);
+ gen = btrfs_node_ptr_generation(b, slot);
+ blocksize = btrfs_level_size(root, level - 1);
+
+ tmp = btrfs_find_tree_block(root, blocknr, blocksize);
+ if (tmp && btrfs_buffer_uptodate(tmp, gen)) {
+ b = tmp;
+ } else {
+ /*
+ * reduce lock contention at high levels
+ * of the btree by dropping locks before
+ * we read.
+ */
+ if (level > 1) {
+ btrfs_release_path(NULL, p);
+ if (tmp)
+ free_extent_buffer(tmp);
+ tmp = read_tree_block(root, blocknr,
+ blocksize, gen);
+ if (tmp)
+ free_extent_buffer(tmp);
+ goto again;
+ } else {
+ if (tmp)
+ free_extent_buffer(tmp);
+ b = read_node_slot(root, b, slot);
+ }
+ }
+ if (!p->skip_locking)
+ btrfs_tree_lock(b);
+ unlock_up(p, level, lowest_unlock);
} else {
p->slots[level] = slot;
+ if (ins_len > 0 && btrfs_leaf_free_space(root, b) <
+ sizeof(struct btrfs_item) + ins_len) {
+ int sret = split_leaf(trans, root, key,
+ p, ins_len, ret == 0);
+ BUG_ON(sret > 0);
+ if (sret)
+ return sret;
+ }
+ unlock_up(p, level, lowest_unlock);
return ret;
}
}
- return -1;
+ return 1;
}
-static void fixup_low_keys(struct ctree_path *path, struct key *key,
- int level)
+/*
+ * adjust the pointers going up the tree, starting at level
+ * making sure the right key of each node is points to 'key'.
+ * 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 btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_disk_key *key, int level)
{
int i;
- /* adjust the pointers going up the tree */
- for (i = level; i < MAX_LEVEL; i++) {
- struct node *t = path->nodes[i];
+ int ret = 0;
+ struct extent_buffer *t;
+
+ for (i = level; i < BTRFS_MAX_LEVEL; i++) {
int tslot = path->slots[i];
- if (!t)
+ if (!path->nodes[i])
break;
- memcpy(t->keys + tslot, key, sizeof(*key));
+ t = path->nodes[i];
+ btrfs_set_node_key(t, key, tslot);
+ btrfs_mark_buffer_dirty(path->nodes[i]);
if (tslot != 0)
break;
}
+ return ret;
}
-int __insert_ptr(struct ctree_root *root,
- struct ctree_path *path, struct key *key,
- u64 blocknr, int slot, int level)
+/*
+ * try to push data from one node into the next node left in the
+ * tree.
+ *
+ * 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 btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *dst,
+ struct extent_buffer *src, int empty)
{
- struct node *c;
- struct node *lower;
- struct key *lower_key;
- int nritems;
- /* need a new root */
- if (!path->nodes[level]) {
- c = malloc(sizeof(struct node));
- memset(c, 0, sizeof(c));
- c->header.nritems = 2;
- c->header.flags = node_level(level);
- lower = path->nodes[level-1];
- if (is_leaf(lower->header.flags))
- lower_key = &((struct leaf *)lower)->items[0].key;
- else
- lower_key = lower->keys;
- memcpy(c->keys, lower_key, sizeof(struct key));
- memcpy(c->keys + 1, key, sizeof(struct key));
- c->blockptrs[0] = (u64)lower;
- c->blockptrs[1] = blocknr;
- root->node = c;
- path->nodes[level] = c;
- path->slots[level] = 0;
- if (c->keys[1].objectid == 0)
- BUG();
- return 0;
+ int push_items = 0;
+ int src_nritems;
+ int dst_nritems;
+ int ret = 0;
+
+ 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 (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));
+
+ if (push_items < src_nritems) {
+ memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(push_items),
+ (src_nritems - push_items) *
+ sizeof(struct btrfs_key_ptr));
+ }
+ btrfs_set_header_nritems(src, src_nritems - push_items);
+ btrfs_set_header_nritems(dst, dst_nritems + push_items);
+ btrfs_mark_buffer_dirty(src);
+ btrfs_mark_buffer_dirty(dst);
+ return ret;
+}
+
+/*
+ * try to push data from one node into the next node right in the
+ * tree.
+ *
+ * returns 0 if some ptrs were pushed, < 0 if there was some horrible
+ * error, and > 0 if there was no room in the right hand block.
+ *
+ * this will only push up to 1/2 the contents of the left node over
+ */
+static int balance_node_right(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *dst,
+ struct extent_buffer *src)
+{
+ int push_items = 0;
+ int max_push;
+ int src_nritems;
+ int dst_nritems;
+ int ret = 0;
+
+ 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) {
+ return 1;
}
+
+ if (max_push < push_items)
+ push_items = max_push;
+
+ memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items),
+ btrfs_node_key_ptr_offset(0),
+ (dst_nritems) *
+ sizeof(struct btrfs_key_ptr));
+
+ copy_extent_buffer(dst, src,
+ btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(src_nritems - push_items),
+ push_items * sizeof(struct btrfs_key_ptr));
+
+ btrfs_set_header_nritems(src, src_nritems - push_items);
+ btrfs_set_header_nritems(dst, dst_nritems + push_items);
+
+ btrfs_mark_buffer_dirty(src);
+ btrfs_mark_buffer_dirty(dst);
+ return ret;
+}
+
+/*
+ * helper function to insert a new root level in the tree.
+ * A new node is allocated, and a single item is inserted to
+ * point to the existing root
+ *
+ * returns zero on success or < 0 on failure.
+ */
+static int noinline insert_new_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int level)
+{
+ u64 root_gen;
+ 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);
+
+ if (root->ref_cows)
+ root_gen = trans->transid;
+ else
+ root_gen = 0;
+
+ lower = path->nodes[level-1];
+ if (level == 1)
+ btrfs_item_key(lower, &lower_key, 0);
+ else
+ btrfs_node_key(lower, &lower_key, 0);
+
+ c = btrfs_alloc_free_block(trans, root, root->nodesize,
+ root->root_key.objectid,
+ root_gen, lower_key.objectid, level,
+ root->node->start, 0);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+
+ memset_extent_buffer(c, 0, 0, root->nodesize);
+ btrfs_set_header_nritems(c, 1);
+ btrfs_set_header_level(c, level);
+ btrfs_set_header_bytenr(c, c->start);
+ btrfs_set_header_generation(c, trans->transid);
+ btrfs_set_header_owner(c, root->root_key.objectid);
+
+ write_extent_buffer(c, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(c),
+ BTRFS_FSID_SIZE);
+
+ write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
+ (unsigned long)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 == 0);
+
+ btrfs_set_node_ptr_generation(c, 0, lower_gen);
+
+ btrfs_mark_buffer_dirty(c);
+
+ spin_lock(&root->node_lock);
+ old = root->node;
+ root->node = c;
+ spin_unlock(&root->node_lock);
+
+ /* the super has an extra ref to root->node */
+ free_extent_buffer(old);
+
+ add_root_to_dirty_list(root);
+ extent_buffer_get(c);
+ path->nodes[level] = c;
+ path->locks[level] = 1;
+ path->slots[level] = 0;
+
+ if (root->ref_cows && lower_gen != trans->transid) {
+ struct btrfs_path *back_path = btrfs_alloc_path();
+ int ret;
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = btrfs_insert_extent_backref(trans,
+ root->fs_info->extent_root,
+ path, lower->start,
+ root->root_key.objectid,
+ trans->transid, 0, 0);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_free_path(back_path);
+ }
+ return 0;
+}
+
+/*
+ * worker function to insert a single pointer in a node.
+ * the node should have enough room for the pointer already
+ *
+ * slot and level indicate where you want the key to go, and
+ * blocknr is the block the key points to.
+ *
+ * returns zero on success and < 0 on any error
+ */
+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 extent_buffer *lower;
+ int nritems;
+
+ BUG_ON(!path->nodes[level]);
lower = path->nodes[level];
- nritems = lower->header.nritems;
+ 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();
+ 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;
}
-int push_node_left(struct ctree_root *root, struct ctree_path *path, int level)
+/*
+ * split the node at the specified level in path in two.
+ * The path is corrected to point to the appropriate node after the split
+ *
+ * Before splitting this tries to make some room in the node by pushing
+ * left and right, if either one works, it returns right away.
+ *
+ * returns 0 on success and < 0 on failure
+ */
+static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int level)
{
- int slot;
- struct node *left;
- struct node *right;
- int push_items = 0;
- int left_nritems;
- int right_nritems;
+ u64 root_gen;
+ struct extent_buffer *c;
+ struct extent_buffer *split;
+ struct btrfs_disk_key disk_key;
+ int mid;
+ int ret;
+ int wret;
+ u32 c_nritems;
+
+ 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(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;
+ }
- if (level == MAX_LEVEL - 1 || path->nodes[level + 1] == 0)
- return 1;
- slot = path->slots[level + 1];
- if (slot == 0)
- return 1;
+ c_nritems = btrfs_header_nritems(c);
+ if (root->ref_cows)
+ root_gen = trans->transid;
+ else
+ root_gen = 0;
+
+ btrfs_node_key(c, &disk_key, 0);
+ split = btrfs_alloc_free_block(trans, root, root->nodesize,
+ root->root_key.objectid,
+ root_gen,
+ btrfs_disk_key_objectid(&disk_key),
+ level, c->start, 0);
+ if (IS_ERR(split))
+ return PTR_ERR(split);
+
+ btrfs_set_header_flags(split, btrfs_header_flags(c));
+ btrfs_set_header_level(split, btrfs_header_level(c));
+ btrfs_set_header_bytenr(split, split->start);
+ btrfs_set_header_generation(split, trans->transid);
+ btrfs_set_header_owner(split, root->root_key.objectid);
+ btrfs_set_header_flags(split, 0);
+ write_extent_buffer(split, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(split),
+ BTRFS_FSID_SIZE);
+ write_extent_buffer(split, root->fs_info->chunk_tree_uuid,
+ (unsigned long)btrfs_header_chunk_tree_uuid(split),
+ BTRFS_UUID_SIZE);
+
+ mid = (c_nritems + 1) / 2;
+
+ copy_extent_buffer(split, c,
+ btrfs_node_key_ptr_offset(0),
+ btrfs_node_key_ptr_offset(mid),
+ (c_nritems - mid) * sizeof(struct btrfs_key_ptr));
+ btrfs_set_header_nritems(split, c_nritems - mid);
+ btrfs_set_header_nritems(c, mid);
+ ret = 0;
+
+ btrfs_mark_buffer_dirty(c);
+ btrfs_mark_buffer_dirty(split);
+
+ btrfs_node_key(split, &disk_key, 0);
+ 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;
+ btrfs_tree_unlock(c);
+ free_extent_buffer(c);
+ path->nodes[level] = split;
+ path->slots[level + 1] += 1;
+ } else {
+ btrfs_tree_unlock(split);
+ free_extent_buffer(split);
+ }
+ return ret;
+}
- left = read_block(path->nodes[level + 1]->blockptrs[slot - 1]);
- right = path->nodes[level];
- left_nritems = left->header.nritems;
- right_nritems = right->header.nritems;
- push_items = NODEPTRS_PER_BLOCK - (left_nritems + 1);
- if (push_items <= 0)
- return 1;
+/*
+ * how many bytes are required to store the items in a leaf. start
+ * 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 extent_buffer *l, int start, int nr)
+{
+ int data_len;
+ int nritems = btrfs_header_nritems(l);
+ int end = min(nritems, start + nr) - 1;
- if (right_nritems < push_items)
- push_items = right_nritems;
- memcpy(left->keys + left_nritems, right->keys,
- push_items * sizeof(struct key));
- memcpy(left->blockptrs + left_nritems, right->blockptrs,
- push_items * sizeof(u64));
- memmove(right->keys, right->keys + push_items,
- (right_nritems - push_items) * sizeof(struct key));
- memmove(right->blockptrs, right->blockptrs + push_items,
- (right_nritems - push_items) * sizeof(u64));
- right->header.nritems -= push_items;
- left->header.nritems += push_items;
-
- /* adjust the pointers going up the tree */
- fixup_low_keys(path, right->keys, level + 1);
+ if (!nr)
+ return 0;
+ 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;
+}
- /* then fixup the leaf pointer in the path */
- if (path->slots[level] < push_items) {
- path->slots[level] += left_nritems;
- path->nodes[level] = (struct node*)left;
- path->slots[level + 1] -= 1;
- } else {
- path->slots[level] -= push_items;
+/*
+ * 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 0;
+ return ret;
}
-int push_node_right(struct ctree_root *root, struct ctree_path *path, int level)
+/*
+ * 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 btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
{
+ struct extent_buffer *left = path->nodes[0];
+ struct extent_buffer *right;
+ struct extent_buffer *upper;
+ struct btrfs_disk_key disk_key;
int slot;
- struct node *dst;
- struct node *src;
+ u32 i;
+ int free_space;
+ int push_space = 0;
int push_items = 0;
- int dst_nritems;
- int src_nritems;
+ struct btrfs_item *item;
+ u32 left_nritems;
+ u32 nr;
+ u32 right_nritems;
+ u32 data_end;
+ u32 this_item_size;
+ int ret;
- if (level == MAX_LEVEL - 1 || path->nodes[level + 1] == 0)
+ slot = path->slots[1];
+ if (!path->nodes[1]) {
return 1;
- slot = path->slots[level + 1];
- if (slot == NODEPTRS_PER_BLOCK - 1)
+ }
+ upper = path->nodes[1];
+ if (slot >= btrfs_header_nritems(upper) - 1)
return 1;
- if (slot >= path->nodes[level + 1]->header.nritems -1)
- return 1;
+ WARN_ON(!btrfs_tree_locked(path->nodes[1]));
- dst = read_block(path->nodes[level + 1]->blockptrs[slot + 1]);
- src = path->nodes[level];
- dst_nritems = dst->header.nritems;
- src_nritems = src->header.nritems;
- push_items = NODEPTRS_PER_BLOCK - (dst_nritems + 1);
- if (push_items <= 0)
- return 1;
+ right = read_node_slot(root, upper, slot + 1);
+ btrfs_tree_lock(right);
+ free_space = btrfs_leaf_free_space(root, right);
+ if (free_space < data_size + sizeof(struct btrfs_item))
+ goto out_unlock;
- if (src_nritems < push_items)
- push_items = src_nritems;
- memmove(dst->keys + push_items, dst->keys,
- dst_nritems * sizeof(struct key));
- memcpy(dst->keys, src->keys + src_nritems - push_items,
- push_items * sizeof(struct key));
+ /* cow and double check */
+ ret = btrfs_cow_block(trans, root, right, upper,
+ slot + 1, &right);
+ if (ret)
+ goto out_unlock;
- memmove(dst->blockptrs + push_items, dst->blockptrs,
- dst_nritems * sizeof(u64));
- memcpy(dst->blockptrs, src->blockptrs + src_nritems - push_items,
- push_items * sizeof(u64));
+ free_space = btrfs_leaf_free_space(root, right);
+ if (free_space < data_size + sizeof(struct btrfs_item))
+ goto out_unlock;
- src->header.nritems -= push_items;
- dst->header.nritems += push_items;
+ left_nritems = btrfs_header_nritems(left);
+ if (left_nritems == 0)
+ goto out_unlock;
- /* adjust the pointers going up the tree */
- memcpy(path->nodes[level + 1]->keys + path->slots[level + 1] + 1,
- dst->keys, sizeof(struct key));
- /* then fixup the leaf pointer in the path */
- if (path->slots[level] >= src->header.nritems) {
- path->slots[level] -= src->header.nritems;
- path->nodes[level] = (struct node*)dst;
- path->slots[level + 1] += 1;
- }
- return 0;
-}
+ if (empty)
+ nr = 0;
+ else
+ nr = 1;
-int insert_ptr(struct ctree_root *root,
- struct ctree_path *path, struct key *key,
- u64 blocknr, int level)
-{
- struct node *c = path->nodes[level];
- struct node *b;
- struct node *bal[MAX_LEVEL];
- int bal_level = level;
- int mid;
- int bal_start = -1;
+ i = left_nritems - 1;
+ while (i >= nr) {
+ item = btrfs_item_nr(left, i);
- memset(bal, 0, ARRAY_SIZE(bal));
- while(c && c->header.nritems == NODEPTRS_PER_BLOCK) {
- if (push_node_left(root, path,
- node_level(c->header.flags)) == 0)
- break;
- if (push_node_right(root, path,
- node_level(c->header.flags)) == 0)
- break;
- bal_start = bal_level;
- if (bal_level == MAX_LEVEL - 1)
- BUG();
- b = malloc(sizeof(struct node));
- b->header.flags = c->header.flags;
- mid = (c->header.nritems + 1) / 2;
- memcpy(b->keys, c->keys + mid,
- (c->header.nritems - mid) * sizeof(struct key));
- memcpy(b->blockptrs, c->blockptrs + mid,
- (c->header.nritems - mid) * sizeof(u64));
- b->header.nritems = c->header.nritems - mid;
- c->header.nritems = mid;
- bal[bal_level] = b;
- if (bal_level == MAX_LEVEL - 1)
+ if (path->slots[0] == i)
+ push_space += data_size + sizeof(*item);
+
+ if (!left->map_token) {
+ map_extent_buffer(left, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &left->map_token, &left->kaddr,
+ &left->map_start, &left->map_len,
+ KM_USER1);
+ }
+
+ this_item_size = btrfs_item_size(left, item);
+ if (this_item_size + sizeof(*item) + push_space > free_space)
break;
- bal_level += 1;
- c = path->nodes[bal_level];
- }
- while(bal_start > 0) {
- b = bal[bal_start];
- c = path->nodes[bal_start];
- __insert_ptr(root, path, b->keys, (u64)b,
- path->slots[bal_start + 1] + 1, bal_start + 1);
- if (path->slots[bal_start] >= c->header.nritems) {
- path->slots[bal_start] -= c->header.nritems;
- path->nodes[bal_start] = b;
- path->slots[bal_start + 1] += 1;
- }
- bal_start--;
- if (!bal[bal_start])
+ push_items++;
+ push_space += this_item_size + sizeof(*item);
+ if (i == 0)
break;
+ i--;
+ }
+ if (left->map_token) {
+ unmap_extent_buffer(left, left->map_token, KM_USER1);
+ left->map_token = NULL;
}
- return __insert_ptr(root, path, key, blocknr, path->slots[level] + 1,
- level);
-}
-int leaf_space_used(struct leaf *l, int start, int nr)
-{
- int data_len;
- int end = start + nr - 1;
+ if (push_items == 0)
+ goto out_unlock;
+
+ if (!empty && push_items == left_nritems)
+ WARN_ON(1);
+
+ /* push left to right */
+ 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 */
+ 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 */
+ 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 */
+ copy_extent_buffer(right, left, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(left_nritems - push_items),
+ push_items * sizeof(struct btrfs_item));
+
+ /* update the item pointers */
+ right_nritems += push_items;
+ btrfs_set_header_nritems(right, right_nritems);
+ push_space = BTRFS_LEAF_DATA_SIZE(root);
+ for (i = 0; i < right_nritems; i++) {
+ item = btrfs_item_nr(right, i);
+ if (!right->map_token) {
+ map_extent_buffer(right, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &right->map_token, &right->kaddr,
+ &right->map_start, &right->map_len,
+ KM_USER1);
+ }
+ push_space -= btrfs_item_size(right, item);
+ btrfs_set_item_offset(right, item, push_space);
+ }
+
+ if (right->map_token) {
+ unmap_extent_buffer(right, right->map_token, KM_USER1);
+ right->map_token = NULL;
+ }
+ 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_nritems) {
+ path->slots[0] -= left_nritems;
+ if (btrfs_header_nritems(path->nodes[0]) == 0)
+ clean_tree_block(trans, root, path->nodes[0]);
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[1] += 1;
+ } else {
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+ return 0;
- 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;
- return data_len;
+out_unlock:
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ return 1;
}
-int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
- int data_size)
+/*
+ * 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 btrfs_trans_handle *trans, struct btrfs_root
+ *root, struct btrfs_path *path, int data_size,
+ int empty)
{
- struct leaf *right = (struct leaf *)path->nodes[0];
- 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;
- }
- left = read_block(path->nodes[1]->blockptrs[slot - 1]);
- free_space = leaf_free_space(left);
- if (free_space < data_size + sizeof(struct item)) {
+
+ right_nritems = btrfs_header_nritems(right);
+ if (right_nritems == 0) {
return 1;
}
- for (i = 0; i < right->header.nritems; i++) {
- item = right->items + i;
+
+ WARN_ON(!btrfs_tree_locked(path->nodes[1]));
+
+ left = read_node_slot(root, path->nodes[1], slot - 1);
+ btrfs_tree_lock(left);
+ free_space = btrfs_leaf_free_space(root, left);
+ if (free_space < data_size + sizeof(struct btrfs_item)) {
+ ret = 1;
+ goto out;
+ }
+
+ /* cow and double check */
+ ret = btrfs_cow_block(trans, root, left,
+ path->nodes[1], slot - 1, &left);
+ if (ret) {
+ /* we hit -ENOSPC, but it isn't fatal here */
+ ret = 1;
+ goto out;
+ }
+
+ free_space = btrfs_leaf_free_space(root, left);
+ if (free_space < data_size + sizeof(struct btrfs_item)) {
+ ret = 1;
+ goto out;
+ }
+
+ if (empty)
+ nr = right_nritems;
+ else
+ nr = right_nritems - 1;
+
+ for (i = 0; i < nr; i++) {
+ item = btrfs_item_nr(right, i);
+ if (!right->map_token) {
+ map_extent_buffer(right, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &right->map_token, &right->kaddr,
+ &right->map_start, &right->map_len,
+ KM_USER1);
+ }
+
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 (right->map_token) {
+ unmap_extent_buffer(right, right->map_token, KM_USER1);
+ right->map_token = NULL;
}
+
if (push_items == 0) {
- return 1;
+ ret = 1;
+ goto out;
}
+ if (!empty && push_items == btrfs_header_nritems(right))
+ WARN_ON(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;
- 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;
- }
- left->header.nritems += push_items;
+ 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(left, i);
+ if (!left->map_token) {
+ map_extent_buffer(left, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &left->map_token, &left->kaddr,
+ &left->map_start, &left->map_len,
+ KM_USER1);
+ }
+
+ ioff = btrfs_item_offset(left, item);
+ btrfs_set_item_offset(left, item,
+ ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size));
+ }
+ btrfs_set_header_nritems(left, old_left_nritems + push_items);
+ if (left->map_token) {
+ unmap_extent_buffer(left, left->map_token, KM_USER1);
+ left->map_token = NULL;
+ }
/* 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;
- for (i = 0; i < right->header.nritems; i++) {
- right->items[i].offset = push_space - right->items[i].size;
- push_space = right->items[i].offset;
- }
- fixup_low_keys(path, &right->items[0].key, 1);
+ if (push_items > right_nritems) {
+ printk("push items %d nr %u\n", push_items, right_nritems);
+ WARN_ON(1);
+ }
+
+ 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(right, i);
+
+ if (!right->map_token) {
+ map_extent_buffer(right, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &right->map_token, &right->kaddr,
+ &right->map_start, &right->map_len,
+ KM_USER1);
+ }
+
+ push_space = push_space - btrfs_item_size(right, item);
+ btrfs_set_item_offset(right, item, push_space);
+ }
+ if (right->map_token) {
+ unmap_extent_buffer(right, right->map_token, KM_USER1);
+ right->map_token = NULL;
+ }
+
+ btrfs_mark_buffer_dirty(left);
+ if (right_nritems)
+ btrfs_mark_buffer_dirty(right);
+
+ btrfs_item_key(right, &disk_key, 0);
+ wret = fixup_low_keys(trans, root, path, &disk_key, 1);
+ if (wret)
+ ret = wret;
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
path->slots[0] += old_left_nritems;
- path->nodes[0] = (struct node*)left;
+ if (btrfs_header_nritems(path->nodes[0]) == 0)
+ clean_tree_block(trans, root, path->nodes[0]);
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = left;
path->slots[1] -= 1;
} else {
+ btrfs_tree_unlock(left);
+ free_extent_buffer(left);
path->slots[0] -= push_items;
}
- return 0;
+ BUG_ON(path->slots[0] < 0);
+ return ret;
+out:
+ btrfs_tree_unlock(left);
+ free_extent_buffer(left);
+ return ret;
}
-int split_leaf(struct ctree_root *root, struct ctree_path *path, int data_size)
+/*
+ * 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 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 leaf *l = (struct leaf *)path->nodes[0];
- int nritems = l->header.nritems;
- int mid = (nritems + 1)/ 2;
- int slot = path->slots[0];
- struct leaf *right;
- int space_needed = data_size + sizeof(struct item);
+ u64 root_gen;
+ struct extent_buffer *l;
+ u32 nritems;
+ int mid;
+ int slot;
+ struct extent_buffer *right;
+ int space_needed = data_size + sizeof(struct btrfs_item);
int data_copy_size;
int rt_data_off;
int i;
- int ret;
+ int ret = 0;
+ int wret;
+ int double_split;
+ int num_doubles = 0;
+ struct btrfs_disk_key disk_key;
+
+ if (extend)
+ space_needed = data_size;
+
+ if (root->ref_cows)
+ root_gen = trans->transid;
+ else
+ root_gen = 0;
+
+ /* first try to make some room by pushing left and right */
+ if (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];
- if (push_leaf_left(root, path, data_size) == 0) {
- return 0;
+ /* did the pushes work? */
+ if (btrfs_leaf_free_space(root, l) >= space_needed)
+ return 0;
+ }
+
+ if (!path->nodes[1]) {
+ ret = insert_new_root(trans, root, path, 1);
+ if (ret)
+ return ret;
}
- right = malloc(sizeof(struct leaf));
- memset(right, 0, sizeof(*right));
+again:
+ double_split = 0;
+ l = path->nodes[0];
+ slot = path->slots[0];
+ nritems = btrfs_header_nritems(l);
+ mid = (nritems + 1)/ 2;
+
+ btrfs_item_key(l, &disk_key, 0);
+
+ right = btrfs_alloc_free_block(trans, root, root->leafsize,
+ root->root_key.objectid,
+ root_gen, disk_key.objectid, 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_owner(right, root->root_key.objectid);
+ btrfs_set_header_level(right, 0);
+ write_extent_buffer(right, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(right),
+ BTRFS_FSID_SIZE);
+
+ write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
+ (unsigned long)btrfs_header_chunk_tree_uuid(right),
+ BTRFS_UUID_SIZE);
if (mid <= slot) {
- if (leaf_space_used(l, mid, nritems - mid) + space_needed >
- LEAF_DATA_SIZE)
- BUG();
+ if (nritems == 1 ||
+ leaf_space_used(l, mid, nritems - mid) + space_needed >
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (slot >= nritems) {
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key, right->start,
+ path->slots[1] + 1, 1);
+ if (wret)
+ ret = wret;
+
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ path->slots[1] += 1;
+ btrfs_mark_buffer_dirty(right);
+ return ret;
+ }
+ mid = slot;
+ if (mid != nritems &&
+ leaf_space_used(l, mid, nritems - mid) +
+ space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
+ double_split = 1;
+ }
+ }
} else {
if (leaf_space_used(l, 0, mid + 1) + space_needed >
- LEAF_DATA_SIZE)
- BUG();
- }
- right->header.nritems = nritems - mid;
- 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;
- ret = insert_ptr(root, path, &right->items[0].key,
- (u64)right, 1);
+ BTRFS_LEAF_DATA_SIZE(root)) {
+ if (!extend && slot == 0) {
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ right->start,
+ path->slots[1], 1);
+ if (wret)
+ ret = wret;
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ if (path->slots[1] == 0) {
+ wret = fixup_low_keys(trans, root,
+ path, &disk_key, 1);
+ if (wret)
+ ret = wret;
+ }
+ btrfs_mark_buffer_dirty(right);
+ return ret;
+ } else if (extend && slot == 0) {
+ mid = 1;
+ } else {
+ mid = slot;
+ if (mid != nritems &&
+ leaf_space_used(l, mid, nritems - mid) +
+ space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
+ double_split = 1;
+ }
+ }
+ }
+ }
+ nritems = nritems - mid;
+ btrfs_set_header_nritems(right, nritems);
+ data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
+
+ copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(mid),
+ nritems * sizeof(struct btrfs_item));
+
+ copy_extent_buffer(right, l,
+ btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) -
+ data_copy_size, btrfs_leaf_data(l) +
+ leaf_data_end(root, l), data_copy_size);
+
+ rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
+ btrfs_item_end_nr(l, mid);
+
+ for (i = 0; i < nritems; i++) {
+ struct btrfs_item *item = btrfs_item_nr(right, i);
+ u32 ioff;
+
+ if (!right->map_token) {
+ map_extent_buffer(right, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &right->map_token, &right->kaddr,
+ &right->map_start, &right->map_len,
+ KM_USER1);
+ }
+
+ ioff = btrfs_item_offset(right, item);
+ btrfs_set_item_offset(right, item, ioff + rt_data_off);
+ }
+
+ if (right->map_token) {
+ unmap_extent_buffer(right, right->map_token, KM_USER1);
+ right->map_token = NULL;
+ }
+
+ btrfs_set_header_nritems(l, mid);
+ ret = 0;
+ 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;
+
+ btrfs_mark_buffer_dirty(right);
+ btrfs_mark_buffer_dirty(l);
+ BUG_ON(path->slots[0] != slot);
+
if (mid <= slot) {
- path->nodes[0] = (struct node *)right;
+ btrfs_tree_unlock(path->nodes[0]);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
path->slots[0] -= mid;
path->slots[1] += 1;
+ } else {
+ btrfs_tree_unlock(right);
+ free_extent_buffer(right);
+ }
+
+ BUG_ON(path->slots[0] < 0);
+
+ if (double_split) {
+ BUG_ON(num_doubles != 0);
+ num_doubles++;
+ goto again;
}
return ret;
}
-int insert_item(struct ctree_root *root, struct key *key,
- void *data, int data_size)
+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;
+ int ret = 0;
+ int slot;
+ int slot_orig;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ u32 nritems;
+ unsigned int data_end;
+ unsigned int old_data_start;
+ unsigned int old_size;
+ unsigned int size_diff;
+ int i;
+
+ slot_orig = path->slots[0];
+ leaf = path->nodes[0];
+ 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(leaf, i);
+
+ if (!leaf->map_token) {
+ map_extent_buffer(leaf, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &leaf->map_token, &leaf->kaddr,
+ &leaf->map_start, &leaf->map_len,
+ KM_USER1);
+ }
+
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + size_diff);
+ }
+
+ if (leaf->map_token) {
+ unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
+ leaf->map_token = NULL;
+ }
+
+ /* 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)
+ fixup_low_keys(trans, root, path, &disk_key, 1);
+ }
+
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_set_item_size(leaf, item, new_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ return ret;
+}
+
+int btrfs_extend_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ u32 data_size)
+{
+ int ret = 0;
+ int slot;
+ int slot_orig;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ u32 nritems;
+ unsigned int data_end;
+ unsigned int old_data;
+ unsigned int old_size;
+ int i;
+
+ slot_orig = path->slots[0];
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
+
+ if (btrfs_leaf_free_space(root, leaf) < data_size) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ slot = path->slots[0];
+ old_data = btrfs_item_end_nr(leaf, slot);
+
+ BUG_ON(slot < 0);
+ 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(leaf, i);
+
+ if (!leaf->map_token) {
+ map_extent_buffer(leaf, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &leaf->map_token, &leaf->kaddr,
+ &leaf->map_start, &leaf->map_len,
+ KM_USER1);
+ }
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff - data_size);
+ }
+
+ if (leaf->map_token) {
+ unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
+ leaf->map_token = NULL;
+ }
+
+ /* shift the data */
+ memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
+ data_end - data_size, btrfs_leaf_data(leaf) +
+ data_end, old_data - data_end);
+
+ data_end = old_data;
+ old_size = btrfs_item_size_nr(leaf, slot);
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_set_item_size(leaf, item, old_size + data_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ return ret;
+}
+
+/*
+ * Given a key and some data, insert an item into the tree.
+ * This does all the path init required, making room in the tree if needed.
+ */
+int btrfs_insert_empty_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;
- struct leaf *leaf;
- unsigned int nritems;
+ int slot_orig;
+ 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];
+ }
- init_path(&path);
- ret = search_slot(root, key, &path);
- if (ret == 0)
+ total_size = total_data + (nr - 1) * sizeof(struct btrfs_item);
+ ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
+ if (ret == 0) {
return -EEXIST;
+ }
+ if (ret < 0)
+ goto out;
+
+ slot_orig = path->slots[0];
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+ data_end = leaf_data_end(root, leaf);
- leaf = (struct leaf *)path.nodes[0];
- if (leaf_free_space(leaf) < sizeof(struct item) + data_size)
- split_leaf(root, &path, data_size);
- leaf = (struct leaf *)path.nodes[0];
- nritems = leaf->header.nritems;
- data_end = leaf_data_end(leaf);
- if (leaf_free_space(leaf) < sizeof(struct item) + data_size)
+ if (btrfs_leaf_free_space(root, leaf) <
+ sizeof(struct btrfs_item) + 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];
+ BUG_ON(slot < 0);
- slot = path.slots[0];
- if (slot == 0)
- fixup_low_keys(&path, key, 1);
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;
+ WARN_ON(leaf->map_token);
+ for (i = slot; i < nritems; i++) {
+ u32 ioff;
+
+ item = btrfs_item_nr(leaf, i);
+ if (!leaf->map_token) {
+ map_extent_buffer(leaf, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &leaf->map_token, &leaf->kaddr,
+ &leaf->map_start, &leaf->map_len,
+ KM_USER1);
+ }
+
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff - total_data);
+ }
+ if (leaf->map_token) {
+ unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
+ leaf->map_token = NULL;
+ }
/* 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;
}
- 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;
- if (leaf_free_space(leaf) < 0)
+
+ /* 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(leaf, 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) {
+ btrfs_cpu_key_to_disk(&disk_key, cpu_key);
+ ret = fixup_low_keys(trans, root, path, &disk_key, 1);
+ }
+
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
BUG();
- return 0;
+ }
+out:
+ return ret;
}
-int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
+/*
+ * 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 slot;
- struct node *node;
- int nritems;
+ 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;
+}
- while(1) {
- node = path->nodes[level];
- if (!node)
- break;
- slot = path->slots[level];
- nritems = node->header.nritems;
-
- 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) {
- int tslot;
- if (slot == 0)
- fixup_low_keys(path, node->keys, level + 1);
- tslot = path->slots[level+1];
- push_node_left(root, path, level);
- if (node->header.nritems) {
- push_node_right(root, path, level);
- }
- if (node->header.nritems)
- break;
- path->slots[level+1] = tslot;
- }
- if (node == root->node) {
- printf("root is now null!\n");
- root->node = NULL;
- break;
- }
- level++;
- if (!path->nodes[level])
- BUG();
- free(node);
+/*
+ * delete the pointer from a given node.
+ *
+ * If the delete empties a node, the node is removed from the tree,
+ * 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 btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct btrfs_path *path, int level, int slot)
+{
+ struct extent_buffer *parent = path->nodes[level];
+ u32 nritems;
+ int ret = 0;
+ int wret;
+
+ nritems = btrfs_header_nritems(parent);
+ if (slot != nritems -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));
}
- return 0;
+ 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 */
+ btrfs_set_header_level(root->node, 0);
+ } else if (slot == 0) {
+ struct btrfs_disk_key disk_key;
+
+ btrfs_node_key(parent, &disk_key, 0);
+ wret = fixup_low_keys(trans, root, path, &disk_key, level + 1);
+ if (wret)
+ ret = wret;
+ }
+ btrfs_mark_buffer_dirty(parent);
+ return ret;
}
-int del_item(struct ctree_root *root, struct ctree_path *path)
+/*
+ * delete the item at the leaf level in path. If that empties
+ * the leaf, remove it from the tree
+ */
+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;
- 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 = (struct leaf *)path->nodes[0];
- slot = path->slots[0];
- doff = leaf->items[slot].offset;
- dsize = leaf->items[slot].size;
+ 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);
- if (slot != leaf->header.nritems - 1) {
+ nritems = btrfs_header_nritems(leaf);
+
+ if (slot + nr != nritems) {
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;
- if (leaf->header.nritems == 0) {
- if (leaf == (struct leaf *)root->node)
- root->node = NULL;
- else
- del_ptr(root, path, 1);
- free(leaf);
+ 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(leaf, i);
+ if (!leaf->map_token) {
+ map_extent_buffer(leaf, (unsigned long)item,
+ sizeof(struct btrfs_item),
+ &leaf->map_token, &leaf->kaddr,
+ &leaf->map_start, &leaf->map_len,
+ KM_USER1);
+ }
+ ioff = btrfs_item_offset(leaf, item);
+ btrfs_set_item_offset(leaf, item, ioff + dsize);
+ }
+
+ if (leaf->map_token) {
+ unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
+ leaf->map_token = NULL;
+ }
+
+ 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;
+
+ /* delete the leaf if we've emptied it */
+ if (nritems == 0) {
+ if (leaf == root->node) {
+ btrfs_set_header_level(leaf, 0);
+ } else {
+ u64 root_gen = btrfs_header_generation(path->nodes[1]);
+ wret = del_ptr(trans, root, path, 1, path->slots[1]);
+ if (wret)
+ ret = wret;
+ wret = btrfs_free_extent(trans, root,
+ leaf->start, leaf->len,
+ btrfs_header_owner(path->nodes[1]),
+ root_gen, 0, 0, 1);
+ if (wret)
+ ret = wret;
+ }
} else {
- if (slot == 0)
- fixup_low_keys(path, &leaf->items[0].key, 1);
- if (leaf_space_used(leaf, 0, leaf->header.nritems) <
- LEAF_DATA_SIZE / 4) {
+ int used = leaf_space_used(leaf, 0, nritems);
+ if (slot == 0) {
+ struct btrfs_disk_key disk_key;
+
+ btrfs_item_key(leaf, &disk_key, 0);
+ wret = fixup_low_keys(trans, root, path,
+ &disk_key, 1);
+ if (wret)
+ ret = wret;
+ }
+
+ /* delete the leaf if it is mostly empty */
+ 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];
- push_leaf_left(root, path, 1);
- if (leaf->header.nritems == 0) {
- free(leaf);
- path->slots[1] = slot;
- del_ptr(root, path, 1);
+ 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 &&
+ btrfs_header_nritems(leaf)) {
+ wret = push_leaf_right(trans, root, path, 1, 1);
+ if (wret < 0 && wret != -ENOSPC)
+ ret = wret;
}
+
+ if (btrfs_header_nritems(leaf) == 0) {
+ u64 root_gen;
+ u64 bytenr = leaf->start;
+ u32 blocksize = leaf->len;
+
+ root_gen = btrfs_header_generation(
+ path->nodes[1]);
+
+ wret = del_ptr(trans, root, path, 1, slot);
+ if (wret)
+ ret = wret;
+
+ free_extent_buffer(leaf);
+ wret = btrfs_free_extent(trans, root, bytenr,
+ blocksize,
+ btrfs_header_owner(path->nodes[1]),
+ root_gen, 0, 0, 1);
+ if (wret)
+ ret = wret;
+ } else {
+ /* if we're still in the path, make sure
+ * we're dirty. Otherwise, one of the
+ * push_leaf functions must have already
+ * dirtied this buffer
+ */
+ if (path->nodes[0] == leaf)
+ btrfs_mark_buffer_dirty(leaf);
+ free_extent_buffer(leaf);
+ }
+ } else {
+ btrfs_mark_buffer_dirty(leaf);
}
}
- return 0;
+ return ret;
}
-void print_leaf(struct leaf *l)
+/*
+ * search the tree again to find a leaf with lesser keys
+ * 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 i;
- int nr = l->header.nritems;
- struct item *item;
- printf("leaf %p total ptrs %d free space %d\n", l, nr,
- leaf_free_space(l));
- fflush(stdout);
- for (i = 0 ; i < nr ; i++) {
- item = l->items + i;
- printf("\titem %d key (%lu %u %lu) itemoff %d itemsize %d\n",
- i,
- item->key.objectid, item->key.flags, item->key.offset,
- item->offset, item->size);
- fflush(stdout);
- printf("\t\titem data %.*s\n", item->size, l->data+item->offset);
- fflush(stdout);
- }
-}
-void print_tree(struct node *c)
+ struct btrfs_key key;
+ struct btrfs_disk_key found_key;
+ int ret;
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, 0);
+
+ if (key.offset > 0)
+ key.offset--;
+ else if (key.type > 0)
+ key.type--;
+ else if (key.objectid > 0)
+ key.objectid--;
+ else
+ return 1;
+
+ btrfs_release_path(root, path);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ return ret;
+ btrfs_item_key(path->nodes[0], &found_key, 0);
+ ret = comp_keys(&found_key, &key);
+ if (ret < 0)
+ return 0;
+ return 1;
+}
+
+/*
+ * search the tree again to find a leaf with greater keys
+ * returns 0 if it found something or 1 if there are no greater leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
- int i;
- int nr;
+ int slot;
+ int level = 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+ struct btrfs_key key;
+ u32 nritems;
+ int ret;
- if (!c)
- return;
- nr = c->header.nritems;
- if (is_leaf(c->header.flags)) {
- print_leaf((struct leaf *)c);
- return;
- }
- printf("node %p level %d total ptrs %d free spc %lu\n", c,
- node_level(c->header.flags), c->header.nritems,
- NODEPTRS_PER_BLOCK - c->header.nritems);
- fflush(stdout);
- for (i = 0; i < nr; i++) {
- printf("\tkey %d (%lu %u %lu) block %lx\n",
- i,
- c->keys[i].objectid, c->keys[i].flags, c->keys[i].offset,
- c->blockptrs[i]);
- fflush(stdout);
+ nritems = btrfs_header_nritems(path->nodes[0]);
+ if (nritems == 0) {
+ return 1;
}
- for (i = 0; i < nr; i++) {
- struct node *next = read_block(c->blockptrs[i]);
- if (is_leaf(next->header.flags) &&
- node_level(c->header.flags) != 1)
- BUG();
- if (node_level(next->header.flags) !=
- node_level(c->header.flags) - 1)
- BUG();
- print_tree(next);
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, nritems - 1);
+
+ btrfs_release_path(root, path);
+ path->keep_locks = 1;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ path->keep_locks = 0;
+
+ if (ret < 0)
+ return ret;
+
+ nritems = btrfs_header_nritems(path->nodes[0]);
+ /*
+ * by releasing the path above we dropped all our locks. A balance
+ * could have added more items next to the key that used to be
+ * at the very end of the block. So, check again here and
+ * advance the path if there are now more items available.
+ */
+ if (nritems > 0 && path->slots[0] < nritems - 1) {
+ path->slots[0]++;
+ goto done;
}
-}
+ while(level < BTRFS_MAX_LEVEL) {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level] + 1;
+ c = path->nodes[level];
+ if (slot >= btrfs_header_nritems(c)) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL) {
+ return 1;
+ }
+ continue;
+ }
+
+ if (next) {
+ btrfs_tree_unlock(next);
+ free_extent_buffer(next);
+ }
-/* for testing only */
-int next_key(int i, int max_key) {
- return rand() % max_key;
- // return i;
+ if (level == 1 && path->locks[1] && path->reada)
+ reada_for_search(root, path, level, slot, 0);
+
+ next = read_node_slot(root, c, slot);
+ if (!path->skip_locking) {
+ WARN_ON(!btrfs_tree_locked(c));
+ btrfs_tree_lock(next);
+ }
+ break;
+ }
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ if (path->locks[level])
+ btrfs_tree_unlock(c);
+ free_extent_buffer(c);
+ path->nodes[level] = next;
+ path->slots[level] = 0;
+ if (!path->skip_locking)
+ path->locks[level] = 1;
+ if (!level)
+ break;
+ if (level == 1 && path->locks[1] && path->reada)
+ reada_for_search(root, path, level, slot, 0);
+ next = read_node_slot(root, next, 0);
+ if (!path->skip_locking) {
+ WARN_ON(!btrfs_tree_locked(path->nodes[level]));
+ btrfs_tree_lock(next);
+ }
+ }
+done:
+ unlock_up(path, 0, 1);
+ return 0;
}
-int main() {
- struct leaf *first_node = malloc(sizeof(struct leaf));
- struct ctree_root root;
- struct key ins;
- struct key last = { (u64)-1, 0, 0};
- char *buf;
- int i;
- int num;
+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;
- int run_size = 100000;
- int max_key = 100000000;
- int tree_size = 0;
- struct ctree_path path;
-
-
- srand(55);
- root.node = (struct node *)first_node;
- memset(first_node, 0, sizeof(*first_node));
- for (i = 0; i < run_size; i++) {
- buf = malloc(64);
- num = next_key(i, max_key);
- // num = i;
- sprintf(buf, "string-%d", num);
- // printf("insert %d\n", num);
- ins.objectid = num;
- ins.offset = 0;
- ins.flags = 0;
- ret = insert_item(&root, &ins, buf, strlen(buf));
- if (!ret)
- tree_size++;
- }
- srand(55);
- for (i = 0; i < run_size; i++) {
- num = next_key(i, max_key);
- ins.objectid = num;
- init_path(&path);
- ret = search_slot(&root, &ins, &path);
- if (ret) {
- print_tree(root.node);
- printf("unable to find %d\n", num);
- exit(1);
- }
- }
- printf("node %p level %d total ptrs %d free spc %lu\n", root.node,
- node_level(root.node->header.flags), root.node->header.nritems,
- NODEPTRS_PER_BLOCK - root.node->header.nritems);
- // print_tree(root.node);
- printf("all searches good\n");
- i = 0;
- srand(55);
- for (i = 0 ; i < run_size/4; i++) {
- num = next_key(i, max_key);
- ins.objectid = num;
- init_path(&path);
- ret = search_slot(&root, &ins, &path);
- if (ret)
- continue;
- ret = del_item(&root, &path);
- if (ret != 0)
- BUG();
- tree_size--;
- }
- srand(128);
- for (i = 0; i < run_size; i++) {
- buf = malloc(64);
- num = next_key(i, max_key);
- sprintf(buf, "string-%d", num);
- ins.objectid = num;
- ret = insert_item(&root, &ins, buf, strlen(buf));
- if (!ret)
- tree_size++;
- }
- while(root.node) {
- struct leaf *leaf;
- int slot;
- ins.objectid = (u64)-1;
- init_path(&path);
- ret = search_slot(&root, &ins, &path);
- if (ret == 0)
- BUG();
-
- leaf = (struct leaf *)(path.nodes[0]);
- slot = path.slots[0];
- if (slot != leaf->header.nritems)
- BUG();
- while(path.slots[0] > 0) {
- path.slots[0] -= 1;
- slot = path.slots[0];
- leaf = (struct leaf *)(path.nodes[0]);
-
- if (comp_keys(&last, &leaf->items[slot].key) <= 0)
- BUG();
- memcpy(&last, &leaf->items[slot].key, sizeof(last));
- ret = del_item(&root, &path);
+
+ while(1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
if (ret != 0)
- BUG();
- tree_size--;
+ 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;
}
- print_tree(root.node);
- printf("tree size is now %d\n", tree_size);
- return 0;
+ return 1;
}
+
projects / deliverable / linux.git / blobdiff