-#include <linux/module.h>
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/sched.h>
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
-static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *orig_root, u64 num_blocks, u64 search_start, u64
- search_end, struct btrfs_key *ins);
+#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
+#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
+#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
+
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
-static int find_search_start(struct btrfs_root *root, int data)
+static int cache_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *block_group)
{
- struct btrfs_block_group_cache *cache[8];
- struct btrfs_fs_info *info = root->fs_info;
- u64 used;
- u64 last;
- int i;
+ struct btrfs_path *path;
int ret;
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ struct extent_map_tree *free_space_cache;
+ int slot;
+ u64 last = 0;
+ u64 hole_size;
+ u64 first_free;
+ int found = 0;
+
+ root = root->fs_info->extent_root;
+ free_space_cache = &root->fs_info->free_space_cache;
- cache[0] = info->block_group_cache;
- if (!cache[0])
- goto find_new;
- used = btrfs_block_group_used(&cache[0]->item);
- if (used < (cache[0]->key.offset * 3 / 2))
+ if (block_group->cached)
return 0;
-find_new:
- last = 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ path->reada = 2;
+ first_free = block_group->key.objectid;
+ key.objectid = block_group->key.objectid;
+ key.offset = 0;
+
+ btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret && path->slots[0] > 0)
+ path->slots[0]--;
+
while(1) {
- ret = radix_tree_gang_lookup_tag(&info->block_group_radix,
- (void **)cache,
- last, ARRAY_SIZE(cache),
- BTRFS_BLOCK_GROUP_DIRTY);
- if (!ret)
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ if (slot >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ goto err;
+ if (ret == 0) {
+ continue;
+ } else {
+ break;
+ }
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid < block_group->key.objectid) {
+ if (key.objectid + key.offset > first_free)
+ first_free = key.objectid + key.offset;
+ goto next;
+ }
+
+ if (key.objectid >= block_group->key.objectid +
+ block_group->key.offset) {
break;
- for (i = 0; i < ret; i++) {
- used = btrfs_block_group_used(&cache[i]->item);
- if (used < (cache[i]->key.offset * 3 / 2)) {
- info->block_group_cache = cache[i];
- cache[i]->last_alloc = cache[i]->first_free;
- return 0;
+ }
+
+ if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
+ if (!found) {
+ last = first_free;
+ found = 1;
+ }
+ if (key.objectid > last) {
+ hole_size = key.objectid - last;
+ set_extent_dirty(free_space_cache, last,
+ last + hole_size - 1,
+ GFP_NOFS);
}
- last = cache[i]->key.objectid +
- cache[i]->key.offset - 1;
+ last = key.objectid + key.offset;
}
+next:
+ path->slots[0]++;
+ }
+
+ if (!found)
+ last = first_free;
+ if (block_group->key.objectid +
+ block_group->key.offset > last) {
+ hole_size = block_group->key.objectid +
+ block_group->key.offset - last;
+ set_extent_dirty(free_space_cache, last,
+ last + hole_size - 1, GFP_NOFS);
+ }
+ block_group->cached = 1;
+err:
+ btrfs_free_path(path);
+ return 0;
+}
+
+struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
+ btrfs_fs_info *info,
+ u64 bytenr)
+{
+ struct extent_map_tree *block_group_cache;
+ struct btrfs_block_group_cache *block_group = NULL;
+ u64 ptr;
+ u64 start;
+ u64 end;
+ int ret;
+
+ block_group_cache = &info->block_group_cache;
+ ret = find_first_extent_bit(block_group_cache,
+ bytenr, &start, &end,
+ BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA);
+ if (ret) {
+ return NULL;
}
- last = 0;
+ ret = get_state_private(block_group_cache, start, &ptr);
+ if (ret)
+ return NULL;
+
+ block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+
+
+ if (block_group->key.objectid <= bytenr && bytenr <=
+ block_group->key.objectid + block_group->key.offset)
+ return block_group;
+
+ return NULL;
+}
+
+static u64 find_search_start(struct btrfs_root *root,
+ struct btrfs_block_group_cache **cache_ret,
+ u64 search_start, int num, int data)
+{
+ int ret;
+ struct btrfs_block_group_cache *cache = *cache_ret;
+ u64 last;
+ u64 start = 0;
+ u64 end = 0;
+ u64 cache_miss = 0;
+ int wrapped = 0;
+
+again:
+ ret = cache_block_group(root, cache);
+ if (ret)
+ goto out;
+
+ last = max(search_start, cache->key.objectid);
+
while(1) {
- ret = radix_tree_gang_lookup(&info->block_group_radix,
- (void **)cache,
- last, ARRAY_SIZE(cache));
- if (!ret)
- break;
- for (i = 0; i < ret; i++) {
- used = btrfs_block_group_used(&cache[i]->item);
- if (used < (cache[i]->key.offset * 3 / 2)) {
- info->block_group_cache = cache[i];
- cache[i]->last_alloc = cache[i]->first_free;
- return 0;
+ ret = find_first_extent_bit(&root->fs_info->free_space_cache,
+ last, &start, &end, EXTENT_DIRTY);
+ if (ret) {
+ if (!cache_miss)
+ cache_miss = last;
+ goto new_group;
+ }
+
+ start = max(last, start);
+ last = end + 1;
+ if (last - start < num) {
+ if (last == cache->key.objectid + cache->key.offset)
+ cache_miss = start;
+ continue;
+ }
+ if (data != BTRFS_BLOCK_GROUP_MIXED &&
+ start + num >= cache->key.objectid + cache->key.offset)
+ goto new_group;
+ return start;
+ }
+out:
+ return search_start;
+
+new_group:
+ last = cache->key.objectid + cache->key.offset;
+wrapped:
+ cache = btrfs_lookup_block_group(root->fs_info, last);
+ if (!cache) {
+ if (!wrapped) {
+ wrapped = 1;
+ last = search_start;
+ data = BTRFS_BLOCK_GROUP_MIXED;
+ goto wrapped;
+ }
+ return search_start;
+ }
+ if (cache_miss && !cache->cached) {
+ cache_block_group(root, cache);
+ last = cache_miss;
+
+ cache = btrfs_lookup_block_group(root->fs_info, last);
+ }
+ cache = btrfs_find_block_group(root, cache, last, data, 0);
+ *cache_ret = cache;
+ cache_miss = 0;
+ goto again;
+}
+
+static u64 div_factor(u64 num, int factor)
+{
+ if (factor == 10)
+ return num;
+ num *= factor;
+ do_div(num, 10);
+ return num;
+}
+
+struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache
+ *hint, u64 search_start,
+ int data, int owner)
+{
+ struct btrfs_block_group_cache *cache;
+ struct extent_map_tree *block_group_cache;
+ struct btrfs_block_group_cache *found_group = NULL;
+ struct btrfs_fs_info *info = root->fs_info;
+ u64 used;
+ u64 last = 0;
+ u64 hint_last;
+ u64 start;
+ u64 end;
+ u64 free_check;
+ u64 ptr;
+ int bit;
+ int ret;
+ int full_search = 0;
+ int factor = 8;
+ int data_swap = 0;
+
+ block_group_cache = &info->block_group_cache;
+
+ if (!owner)
+ factor = 8;
+
+ if (data == BTRFS_BLOCK_GROUP_MIXED) {
+ bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
+ factor = 10;
+ } else if (data)
+ bit = BLOCK_GROUP_DATA;
+ else
+ bit = BLOCK_GROUP_METADATA;
+
+ if (search_start) {
+ struct btrfs_block_group_cache *shint;
+ shint = btrfs_lookup_block_group(info, search_start);
+ if (shint && (shint->data == data ||
+ shint->data == BTRFS_BLOCK_GROUP_MIXED)) {
+ used = btrfs_block_group_used(&shint->item);
+ if (used < div_factor(shint->key.offset, factor)) {
+ return shint;
}
- last = cache[i]->key.objectid +
- cache[i]->key.offset - 1;
}
}
- info->block_group_cache = NULL;
- return 0;
+ if (hint && (hint->data == data ||
+ hint->data == BTRFS_BLOCK_GROUP_MIXED)) {
+ used = btrfs_block_group_used(&hint->item);
+ if (used < div_factor(hint->key.offset, factor)) {
+ return hint;
+ }
+ last = hint->key.objectid + hint->key.offset;
+ hint_last = last;
+ } else {
+ if (hint)
+ hint_last = max(hint->key.objectid, search_start);
+ else
+ hint_last = search_start;
+
+ last = hint_last;
+ }
+again:
+ while(1) {
+ ret = find_first_extent_bit(block_group_cache, last,
+ &start, &end, bit);
+ if (ret)
+ break;
+
+ ret = get_state_private(block_group_cache, start, &ptr);
+ if (ret)
+ break;
+
+ cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+ last = cache->key.objectid + cache->key.offset;
+ used = btrfs_block_group_used(&cache->item);
+
+ if (full_search)
+ free_check = cache->key.offset;
+ else
+ free_check = div_factor(cache->key.offset, factor);
+
+ if (used < free_check) {
+ found_group = cache;
+ goto found;
+ }
+ cond_resched();
+ }
+ if (!full_search) {
+ last = search_start;
+ full_search = 1;
+ goto again;
+ }
+ if (!data_swap) {
+ data_swap = 1;
+ bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
+ last = search_start;
+ goto again;
+ }
+found:
+ return found_group;
}
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 blocknr, u64 num_blocks)
+ u64 bytenr, u64 num_bytes)
{
struct btrfs_path *path;
int ret;
struct btrfs_key key;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
struct btrfs_extent_item *item;
- struct btrfs_key ins;
u32 refs;
- find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1,
- &ins);
+ WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- key.objectid = blocknr;
- key.flags = 0;
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- key.offset = num_blocks;
+ key.offset = num_bytes;
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 1);
+ if (ret < 0)
+ return ret;
if (ret != 0) {
-printk("can't find block %Lu %Lu\n", blocknr, num_blocks);
BUG();
}
BUG_ON(ret != 0);
- l = btrfs_buffer_leaf(path->nodes[0]);
+ l = path->nodes[0];
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- refs = btrfs_extent_refs(item);
- btrfs_set_extent_refs(item, refs + 1);
+ refs = btrfs_extent_refs(l, item);
+ btrfs_set_extent_refs(l, item, refs + 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
return 0;
}
+int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ finish_current_insert(trans, root->fs_info->extent_root);
+ del_pending_extents(trans, root->fs_info->extent_root);
+ return 0;
+}
+
static int lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 blocknr,
- u64 num_blocks, u32 *refs)
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs)
{
struct btrfs_path *path;
int ret;
struct btrfs_key key;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
struct btrfs_extent_item *item;
+ WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
- btrfs_init_path(path);
- key.objectid = blocknr;
- key.offset = num_blocks;
- key.flags = 0;
+ key.objectid = bytenr;
+ key.offset = num_bytes;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 0);
- if (ret != 0)
+ if (ret < 0)
+ goto out;
+ if (ret != 0) {
+ btrfs_print_leaf(root, path->nodes[0]);
+ printk("failed to find block number %Lu\n", bytenr);
BUG();
- l = btrfs_buffer_leaf(path->nodes[0]);
+ }
+ l = path->nodes[0];
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- *refs = btrfs_extent_refs(item);
- btrfs_release_path(root->fs_info->extent_root, path);
+ *refs = btrfs_extent_refs(l, item);
+out:
btrfs_free_path(path);
return 0;
}
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- return btrfs_inc_extent_ref(trans, root, bh_blocknr(root->node), 1);
+ return btrfs_inc_extent_ref(trans, root, root->node->start,
+ root->node->len);
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct buffer_head *buf)
+ struct extent_buffer *buf)
{
- u64 blocknr;
- struct btrfs_node *buf_node;
- struct btrfs_leaf *buf_leaf;
- struct btrfs_disk_key *key;
+ u64 bytenr;
+ u32 nritems;
+ struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
- int leaf;
+ int level;
int ret;
+ int faili;
+ int err;
if (!root->ref_cows)
return 0;
- buf_node = btrfs_buffer_node(buf);
- leaf = btrfs_is_leaf(buf_node);
- buf_leaf = btrfs_buffer_leaf(buf);
- for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) {
- if (leaf) {
- key = &buf_leaf->items[i].key;
- if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
+
+ level = btrfs_header_level(buf);
+ nritems = btrfs_header_nritems(buf);
+ for (i = 0; i < nritems; i++) {
+ if (level == 0) {
+ u64 disk_bytenr;
+ btrfs_item_key_to_cpu(buf, &key, i);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
- fi = btrfs_item_ptr(buf_leaf, i,
+ fi = btrfs_item_ptr(buf, i,
struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(fi) ==
+ if (btrfs_file_extent_type(buf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- ret = btrfs_inc_extent_ref(trans, root,
- btrfs_file_extent_disk_blocknr(fi),
- btrfs_file_extent_disk_num_blocks(fi));
- BUG_ON(ret);
+ disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (disk_bytenr == 0)
+ continue;
+ ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(buf, fi));
+ if (ret) {
+ faili = i;
+ goto fail;
+ }
} else {
- blocknr = btrfs_node_blockptr(buf_node, i);
- ret = btrfs_inc_extent_ref(trans, root, blocknr, 1);
- BUG_ON(ret);
+ bytenr = btrfs_node_blockptr(buf, i);
+ ret = btrfs_inc_extent_ref(trans, root, bytenr,
+ btrfs_level_size(root, level - 1));
+ if (ret) {
+ faili = i;
+ goto fail;
+ }
}
}
return 0;
+fail:
+ WARN_ON(1);
+ for (i =0; i < faili; i++) {
+ if (level == 0) {
+ u64 disk_bytenr;
+ btrfs_item_key_to_cpu(buf, &key, i);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+ fi = btrfs_item_ptr(buf, i,
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(buf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (disk_bytenr == 0)
+ continue;
+ err = btrfs_free_extent(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(buf,
+ fi), 0);
+ BUG_ON(err);
+ } else {
+ bytenr = btrfs_node_blockptr(buf, i);
+ err = btrfs_free_extent(trans, root, bytenr,
+ btrfs_level_size(root, level - 1), 0);
+ BUG_ON(err);
+ }
+ }
+ return ret;
}
static int write_one_cache_group(struct btrfs_trans_handle *trans,
int ret;
int pending_ret;
struct btrfs_root *extent_root = root->fs_info->extent_root;
- struct btrfs_block_group_item *bi;
- struct btrfs_key ins;
+ unsigned long bi;
+ struct extent_buffer *leaf;
- find_free_extent(trans, extent_root, 0, 0, (u64)-1, &ins);
ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
+ if (ret < 0)
+ goto fail;
BUG_ON(ret);
- bi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
- struct btrfs_block_group_item);
- memcpy(bi, &cache->item, sizeof(*bi));
- mark_buffer_dirty(path->nodes[0]);
- btrfs_release_path(extent_root, path);
+ leaf = path->nodes[0];
+ bi = btrfs_item_ptr_offset(leaf, path->slots[0]);
+ write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item));
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(extent_root, path);
+fail:
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
if (ret)
}
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+ struct btrfs_root *root)
{
- struct btrfs_block_group_cache *cache[8];
+ struct extent_map_tree *block_group_cache;
+ struct btrfs_block_group_cache *cache;
int ret;
int err = 0;
int werr = 0;
- struct radix_tree_root *radix = &root->fs_info->block_group_radix;
- int i;
struct btrfs_path *path;
+ u64 last = 0;
+ u64 start;
+ u64 end;
+ u64 ptr;
+ block_group_cache = &root->fs_info->block_group_cache;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
while(1) {
- ret = radix_tree_gang_lookup_tag(radix, (void **)cache,
- 0, ARRAY_SIZE(cache),
- BTRFS_BLOCK_GROUP_DIRTY);
- if (!ret)
+ ret = find_first_extent_bit(block_group_cache, last,
+ &start, &end, BLOCK_GROUP_DIRTY);
+ if (ret)
+ break;
+
+ last = end + 1;
+ ret = get_state_private(block_group_cache, start, &ptr);
+ if (ret)
break;
- for (i = 0; i < ret; i++) {
- radix_tree_tag_clear(radix, cache[i]->key.objectid +
- cache[i]->key.offset - 1,
- BTRFS_BLOCK_GROUP_DIRTY);
- err = write_one_cache_group(trans, root,
- path, cache[i]);
- if (err)
- werr = err;
+
+ cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+ err = write_one_cache_group(trans, root,
+ path, cache);
+ /*
+ * if we fail to write the cache group, we want
+ * to keep it marked dirty in hopes that a later
+ * write will work
+ */
+ if (err) {
+ werr = err;
+ continue;
}
+ clear_extent_bits(block_group_cache, start, end,
+ BLOCK_GROUP_DIRTY, GFP_NOFS);
}
btrfs_free_path(path);
return werr;
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 blocknr, u64 num, int alloc)
+ u64 bytenr, u64 num_bytes, int alloc,
+ int mark_free, int data)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
- u64 total = num;
+ u64 total = num_bytes;
u64 old_val;
- u64 block_in_group;
- int ret;
+ u64 byte_in_group;
+ u64 start;
+ u64 end;
+
while(total) {
- ret = radix_tree_gang_lookup(&info->block_group_radix,
- (void **)&cache, blocknr, 1);
- if (!ret) {
- printk(KERN_CRIT "blocknr %Lu lookup failed\n",
- blocknr);
+ cache = btrfs_lookup_block_group(info, bytenr);
+ if (!cache) {
return -1;
}
- block_in_group = blocknr - cache->key.objectid;
- WARN_ON(block_in_group > cache->key.offset);
- radix_tree_tag_set(&info->block_group_radix,
- cache->key.objectid + cache->key.offset - 1,
- BTRFS_BLOCK_GROUP_DIRTY);
+ byte_in_group = bytenr - cache->key.objectid;
+ WARN_ON(byte_in_group > cache->key.offset);
+ start = cache->key.objectid;
+ end = start + cache->key.offset - 1;
+ set_extent_bits(&info->block_group_cache, start, end,
+ BLOCK_GROUP_DIRTY, GFP_NOFS);
old_val = btrfs_block_group_used(&cache->item);
- num = min(total, cache->key.offset - block_in_group);
- total -= num;
- blocknr += num;
+ num_bytes = min(total, cache->key.offset - byte_in_group);
if (alloc) {
- old_val += num;
- if (blocknr > cache->last_alloc)
- cache->last_alloc = blocknr;
+ if (cache->data != data &&
+ old_val < (cache->key.offset >> 1)) {
+ int bit_to_clear;
+ int bit_to_set;
+ cache->data = data;
+ if (data) {
+ bit_to_clear = BLOCK_GROUP_METADATA;
+ bit_to_set = BLOCK_GROUP_DATA;
+ cache->item.flags &=
+ ~BTRFS_BLOCK_GROUP_MIXED;
+ cache->item.flags |=
+ BTRFS_BLOCK_GROUP_DATA;
+ } else {
+ bit_to_clear = BLOCK_GROUP_DATA;
+ bit_to_set = BLOCK_GROUP_METADATA;
+ cache->item.flags &=
+ ~BTRFS_BLOCK_GROUP_MIXED;
+ cache->item.flags &=
+ ~BTRFS_BLOCK_GROUP_DATA;
+ }
+ clear_extent_bits(&info->block_group_cache,
+ start, end, bit_to_clear,
+ GFP_NOFS);
+ set_extent_bits(&info->block_group_cache,
+ start, end, bit_to_set,
+ GFP_NOFS);
+ } else if (cache->data != data &&
+ cache->data != BTRFS_BLOCK_GROUP_MIXED) {
+ cache->data = BTRFS_BLOCK_GROUP_MIXED;
+ set_extent_bits(&info->block_group_cache,
+ start, end,
+ BLOCK_GROUP_DATA |
+ BLOCK_GROUP_METADATA,
+ GFP_NOFS);
+ }
+ old_val += num_bytes;
} else {
- old_val -= num;
- if (blocknr < cache->first_free)
- cache->first_free = blocknr;
+ old_val -= num_bytes;
+ if (mark_free) {
+ set_extent_dirty(&info->free_space_cache,
+ bytenr, bytenr + num_bytes - 1,
+ GFP_NOFS);
+ }
}
btrfs_set_block_group_used(&cache->item, old_val);
+ total -= num_bytes;
+ bytenr += num_bytes;
}
return 0;
}
-int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
- btrfs_root *root)
+int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy)
{
- unsigned long gang[8];
- u64 first = 0;
+ u64 last = 0;
+ u64 start;
+ u64 end;
+ struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents;
int ret;
- int i;
- struct radix_tree_root *pinned_radix = &root->fs_info->pinned_radix;
while(1) {
- ret = find_first_radix_bit(pinned_radix, gang,
- ARRAY_SIZE(gang));
- if (!ret)
+ ret = find_first_extent_bit(pinned_extents, last,
+ &start, &end, EXTENT_DIRTY);
+ if (ret)
break;
- if (!first)
- first = gang[0];
- for (i = 0; i < ret; i++) {
- clear_radix_bit(pinned_radix, gang[i]);
- }
+ set_extent_dirty(copy, start, end, GFP_NOFS);
+ last = end + 1;
}
- if (root->fs_info->block_group_cache) {
- root->fs_info->block_group_cache->last_alloc =
- root->fs_info->block_group_cache->first_free;
+ return 0;
+}
+
+int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_map_tree *unpin)
+{
+ u64 start;
+ u64 end;
+ int ret;
+ struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents;
+ struct extent_map_tree *free_space_cache;
+
+ free_space_cache = &root->fs_info->free_space_cache;
+
+ while(1) {
+ ret = find_first_extent_bit(unpin, 0, &start, &end,
+ EXTENT_DIRTY);
+ if (ret)
+ break;
+
+ clear_extent_dirty(pinned_extents, start, end,
+ GFP_NOFS);
+ clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ set_extent_dirty(free_space_cache, start, end, GFP_NOFS);
}
return 0;
}
{
struct btrfs_key ins;
struct btrfs_extent_item extent_item;
- int i;
int ret;
- u64 super_blocks_used;
+ int err = 0;
+ u64 start;
+ u64 end;
struct btrfs_fs_info *info = extent_root->fs_info;
- btrfs_set_extent_refs(&extent_item, 1);
- ins.offset = 1;
- ins.flags = 0;
+ btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_extent_owner(&extent_item, extent_root->root_key.objectid);
-
- for (i = 0; i < extent_root->fs_info->extent_tree_insert_nr; i++) {
- ins.objectid = extent_root->fs_info->extent_tree_insert[i];
- super_blocks_used = btrfs_super_blocks_used(info->disk_super);
- btrfs_set_super_blocks_used(info->disk_super,
- super_blocks_used + 1);
- ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item,
- sizeof(extent_item));
- BUG_ON(ret);
+ btrfs_set_stack_extent_owner(&extent_item,
+ extent_root->root_key.objectid);
+
+ while(1) {
+ ret = find_first_extent_bit(&info->extent_ins, 0, &start,
+ &end, EXTENT_LOCKED);
+ if (ret)
+ break;
+
+ ins.objectid = start;
+ ins.offset = end + 1 - start;
+ err = btrfs_insert_item(trans, extent_root, &ins,
+ &extent_item, sizeof(extent_item));
+ clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
+ GFP_NOFS);
}
- extent_root->fs_info->extent_tree_insert_nr = 0;
- extent_root->fs_info->extent_tree_prealloc_nr = 0;
return 0;
}
-static int pin_down_block(struct btrfs_root *root, u64 blocknr, int pending)
+static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
+ int pending)
{
- int err;
- struct btrfs_header *header;
- struct buffer_head *bh;
+ int err = 0;
+ struct extent_buffer *buf;
if (!pending) {
- bh = btrfs_find_tree_block(root, blocknr);
- if (bh) {
- if (buffer_uptodate(bh)) {
+ buf = btrfs_find_tree_block(root, bytenr, num_bytes);
+ if (buf) {
+ if (btrfs_buffer_uptodate(buf)) {
u64 transid =
root->fs_info->running_transaction->transid;
- header = btrfs_buffer_header(bh);
- if (btrfs_header_generation(header) ==
- transid) {
- btrfs_block_release(root, bh);
- return 0;
+ if (btrfs_header_generation(buf) == transid) {
+ free_extent_buffer(buf);
+ return 1;
}
}
- btrfs_block_release(root, bh);
+ free_extent_buffer(buf);
}
- err = set_radix_bit(&root->fs_info->pinned_radix, blocknr);
+ set_extent_dirty(&root->fs_info->pinned_extents,
+ bytenr, bytenr + num_bytes - 1, GFP_NOFS);
} else {
- err = set_radix_bit(&root->fs_info->pending_del_radix, blocknr);
+ set_extent_bits(&root->fs_info->pending_del,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
}
- BUG_ON(err);
+ BUG_ON(err < 0);
return 0;
}
* remove an extent from the root, returns 0 on success
*/
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 blocknr, u64 num_blocks, int pin)
+ *root, u64 bytenr, u64 num_bytes, int pin,
+ int mark_free)
{
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
+ struct extent_buffer *leaf;
int ret;
struct btrfs_extent_item *ei;
- struct btrfs_key ins;
u32 refs;
- key.objectid = blocknr;
- key.flags = 0;
+ key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- key.offset = num_blocks;
+ key.offset = num_bytes;
- find_free_extent(trans, root, 0, 0, (u64)-1, &ins);
path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
+ if (!path)
+ return -ENOMEM;
ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- if (ret) {
- printk("failed to find %Lu\n", key.objectid);
- btrfs_print_tree(extent_root, extent_root->node);
- printk("failed to find %Lu\n", key.objectid);
- BUG();
- }
- ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
+ if (ret < 0)
+ return ret;
+ BUG_ON(ret);
+
+ leaf = path->nodes[0];
+ ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
- BUG_ON(ei->refs == 0);
- refs = btrfs_extent_refs(ei) - 1;
- btrfs_set_extent_refs(ei, refs);
- btrfs_mark_buffer_dirty(path->nodes[0]);
+ refs = btrfs_extent_refs(leaf, ei);
+ BUG_ON(refs == 0);
+ refs -= 1;
+ btrfs_set_extent_refs(leaf, ei, refs);
+ btrfs_mark_buffer_dirty(leaf);
+
if (refs == 0) {
- u64 super_blocks_used;
+ u64 super_used;
+ u64 root_used;
if (pin) {
- ret = pin_down_block(root, blocknr, 0);
- BUG_ON(ret);
+ ret = pin_down_bytes(root, bytenr, num_bytes, 0);
+ if (ret > 0)
+ mark_free = 1;
+ BUG_ON(ret < 0);
}
- super_blocks_used = btrfs_super_blocks_used(info->disk_super);
- btrfs_set_super_blocks_used(info->disk_super,
- super_blocks_used - num_blocks);
+ /* block accounting for super block */
+ super_used = btrfs_super_bytes_used(&info->super_copy);
+ btrfs_set_super_bytes_used(&info->super_copy,
+ super_used - num_bytes);
+
+ /* block accounting for root item */
+ root_used = btrfs_root_used(&root->root_item);
+ btrfs_set_root_used(&root->root_item,
+ root_used - num_bytes);
+
ret = btrfs_del_item(trans, extent_root, path);
- if (ret)
- BUG();
- ret = update_block_group(trans, root, blocknr, num_blocks, 0);
+ if (ret) {
+ return ret;
+ }
+ ret = update_block_group(trans, root, bytenr, num_bytes, 0,
+ mark_free, 0);
BUG_ON(ret);
}
- btrfs_release_path(extent_root, path);
btrfs_free_path(path);
finish_current_insert(trans, extent_root);
return ret;
btrfs_root *extent_root)
{
int ret;
- int wret;
int err = 0;
- unsigned long gang[4];
- int i;
- struct radix_tree_root *pending_radix;
- struct radix_tree_root *pinned_radix;
+ u64 start;
+ u64 end;
+ struct extent_map_tree *pending_del;
+ struct extent_map_tree *pinned_extents;
- pending_radix = &extent_root->fs_info->pending_del_radix;
- pinned_radix = &extent_root->fs_info->pinned_radix;
+ pending_del = &extent_root->fs_info->pending_del;
+ pinned_extents = &extent_root->fs_info->pinned_extents;
while(1) {
- ret = find_first_radix_bit(pending_radix, gang,
- ARRAY_SIZE(gang));
- if (!ret)
+ ret = find_first_extent_bit(pending_del, 0, &start, &end,
+ EXTENT_LOCKED);
+ if (ret)
break;
- for (i = 0; i < ret; i++) {
- wret = set_radix_bit(pinned_radix, gang[i]);
- BUG_ON(wret);
- wret = clear_radix_bit(pending_radix, gang[i]);
- BUG_ON(wret);
- wret = __free_extent(trans, extent_root,
- gang[i], 1, 0);
- if (wret)
- err = wret;
- }
+
+ set_extent_dirty(pinned_extents, start, end, GFP_NOFS);
+ clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
+ GFP_NOFS);
+ ret = __free_extent(trans, extent_root,
+ start, end + 1 - start, 0, 0);
+ if (ret)
+ err = ret;
}
return err;
}
* remove an extent from the root, returns 0 on success
*/
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 blocknr, u64 num_blocks, int pin)
+ *root, u64 bytenr, u64 num_bytes, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
int pending_ret;
int ret;
+ WARN_ON(num_bytes < root->sectorsize);
if (root == extent_root) {
- pin_down_block(root, blocknr, 1);
+ pin_down_bytes(root, bytenr, num_bytes, 1);
return 0;
}
- ret = __free_extent(trans, root, blocknr, num_blocks, pin);
+ ret = __free_extent(trans, root, bytenr, num_bytes, pin, pin == 0);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
* Any available blocks before search_start are skipped.
*/
static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *orig_root, u64 num_blocks, u64 search_start, u64
- search_end, struct btrfs_key *ins)
+ *orig_root, u64 num_bytes, u64 empty_size,
+ u64 search_start, u64 search_end, u64 hint_byte,
+ struct btrfs_key *ins, u64 exclude_start,
+ u64 exclude_nr, int data)
{
struct btrfs_path *path;
struct btrfs_key key;
int ret;
u64 hole_size = 0;
int slot = 0;
- u64 last_block = 0;
- u64 test_block;
+ u64 last_byte = 0;
+ u64 orig_search_start = search_start;
int start_found;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
struct btrfs_root * root = orig_root->fs_info->extent_root;
struct btrfs_fs_info *info = root->fs_info;
- int total_needed = num_blocks;
- int total_found = 0;
- int fill_prealloc = 0;
+ u64 total_needed = num_bytes;
int level;
+ struct btrfs_block_group_cache *block_group;
+ int full_scan = 0;
+ int wrapped = 0;
+ u64 cached_start;
- path = btrfs_alloc_path();
- ins->flags = 0;
+ WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
- level = btrfs_header_level(btrfs_buffer_header(root->node));
- if (num_blocks == 0) {
- fill_prealloc = 1;
- num_blocks = 1;
- total_needed = min(level + 2, BTRFS_MAX_LEVEL) * 3;
+ level = btrfs_header_level(root->node);
+
+ if (num_bytes >= 96 * 1024 * 1024 && hint_byte) {
+ data = BTRFS_BLOCK_GROUP_MIXED;
}
- find_search_start(root, 0);
- if (info->block_group_cache &&
- info->block_group_cache->last_alloc > search_start)
- search_start = info->block_group_cache->last_alloc;
+
+ if (search_end == (u64)-1)
+ search_end = btrfs_super_total_bytes(&info->super_copy);
+ if (hint_byte) {
+ block_group = btrfs_lookup_block_group(info, hint_byte);
+ block_group = btrfs_find_block_group(root, block_group,
+ hint_byte, data, 1);
+ } else {
+ block_group = btrfs_find_block_group(root,
+ trans->block_group, 0,
+ data, 1);
+ }
+
+ total_needed += empty_size;
+ path = btrfs_alloc_path();
check_failed:
+ search_start = find_search_start(root, &block_group,
+ search_start, total_needed, data);
+ cached_start = search_start;
+
btrfs_init_path(path);
ins->objectid = search_start;
ins->offset = 0;
start_found = 0;
+ path->reada = 2;
+
ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
if (ret < 0)
goto error;
- if (path->slots[0] > 0)
+ if (path->slots[0] > 0) {
path->slots[0]--;
+ }
+
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+
+ /*
+ * a rare case, go back one key if we hit a block group item
+ * instead of an extent item
+ */
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY &&
+ key.objectid + key.offset >= search_start) {
+ ins->objectid = key.objectid;
+ ins->offset = key.offset - 1;
+ btrfs_release_path(root, path);
+ ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
+ if (ret < 0)
+ goto error;
+
+ if (path->slots[0] > 0) {
+ path->slots[0]--;
+ }
+ }
while (1) {
- l = btrfs_buffer_leaf(path->nodes[0]);
+ l = path->nodes[0];
slot = path->slots[0];
- if (slot >= btrfs_header_nritems(&l->header)) {
- if (fill_prealloc) {
- info->extent_tree_prealloc_nr = 0;
- total_found = 0;
- }
+ if (slot >= btrfs_header_nritems(l)) {
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;
if (ret < 0)
goto error;
+
+ search_start = max(search_start,
+ block_group->key.objectid);
if (!start_found) {
ins->objectid = search_start;
- ins->offset = (u64)-1 - search_start;
+ ins->offset = search_end - search_start;
start_found = 1;
goto check_pending;
}
- ins->objectid = last_block > search_start ?
- last_block : search_start;
- ins->offset = (u64)-1 - ins->objectid;
+ ins->objectid = last_byte > search_start ?
+ last_byte : search_start;
+ ins->offset = search_end - ins->objectid;
+ BUG_ON(ins->objectid >= search_end);
goto check_pending;
}
- btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
- if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY)
- goto next;
- if (key.objectid >= search_start) {
- if (start_found) {
- if (last_block < search_start)
- last_block = search_start;
- hole_size = key.objectid - last_block;
- if (hole_size >= num_blocks) {
- ins->objectid = last_block;
- ins->offset = hole_size;
- goto check_pending;
- }
+ btrfs_item_key_to_cpu(l, &key, slot);
+
+ if (key.objectid >= search_start && key.objectid > last_byte &&
+ start_found) {
+ if (last_byte < search_start)
+ last_byte = search_start;
+ hole_size = key.objectid - last_byte;
+ if (hole_size >= num_bytes) {
+ ins->objectid = last_byte;
+ ins->offset = hole_size;
+ goto check_pending;
+ }
+ }
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
+ if (!start_found) {
+ last_byte = key.objectid;
+ start_found = 1;
}
+ goto next;
}
+
+
start_found = 1;
- last_block = key.objectid + key.offset;
+ last_byte = key.objectid + key.offset;
+
+ if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
+ last_byte >= block_group->key.objectid +
+ block_group->key.offset) {
+ btrfs_release_path(root, path);
+ search_start = block_group->key.objectid +
+ block_group->key.offset;
+ goto new_group;
+ }
next:
path->slots[0]++;
+ cond_resched();
}
- // FIXME -ENOSPC
check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
*/
btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
- for (test_block = ins->objectid;
- test_block < ins->objectid + num_blocks; test_block++) {
- if (test_radix_bit(&info->pinned_radix, test_block)) {
- search_start = test_block + 1;
- goto check_failed;
- }
- }
- if (!fill_prealloc && info->extent_tree_insert_nr) {
- u64 last =
- info->extent_tree_insert[info->extent_tree_insert_nr - 1];
- if (ins->objectid + num_blocks >
- info->extent_tree_insert[0] &&
- ins->objectid <= last) {
- search_start = last + 1;
- WARN_ON(1);
- goto check_failed;
- }
+
+ if (ins->objectid + num_bytes >= search_end)
+ goto enospc;
+
+ if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
+ ins->objectid + num_bytes >= block_group->
+ key.objectid + block_group->key.offset) {
+ search_start = block_group->key.objectid +
+ block_group->key.offset;
+ goto new_group;
}
- if (!fill_prealloc && info->extent_tree_prealloc_nr) {
- u64 first =
- info->extent_tree_prealloc[info->extent_tree_prealloc_nr - 1];
- if (ins->objectid + num_blocks > first &&
- ins->objectid <= info->extent_tree_prealloc[0]) {
- search_start = info->extent_tree_prealloc[0] + 1;
- WARN_ON(1);
- goto check_failed;
- }
+ if (test_range_bit(&info->extent_ins, ins->objectid,
+ ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) {
+ search_start = ins->objectid + num_bytes;
+ goto new_group;
}
- if (fill_prealloc) {
- int nr;
- test_block = ins->objectid;
- while(test_block < ins->objectid + ins->offset &&
- total_found < total_needed) {
- nr = total_needed - total_found - 1;
- BUG_ON(nr < 0);
- info->extent_tree_prealloc[nr] = test_block;
- total_found++;
- test_block++;
- }
- if (total_found < total_needed) {
- search_start = test_block;
- goto check_failed;
- }
- info->extent_tree_prealloc_nr = total_found;
+ if (test_range_bit(&info->pinned_extents, ins->objectid,
+ ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) {
+ search_start = ins->objectid + num_bytes;
+ goto new_group;
}
- ret = radix_tree_gang_lookup(&info->block_group_radix,
- (void **)&info->block_group_cache,
- ins->objectid, 1);
- if (ret) {
- info->block_group_cache->last_alloc = ins->objectid;
+ if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start &&
+ ins->objectid < exclude_start + exclude_nr)) {
+ search_start = exclude_start + exclude_nr;
+ goto new_group;
+ }
+ if (!data) {
+ block_group = btrfs_lookup_block_group(info, ins->objectid);
+ if (block_group)
+ trans->block_group = block_group;
}
- ins->offset = num_blocks;
+ ins->offset = num_bytes;
btrfs_free_path(path);
return 0;
+
+new_group:
+ if (search_start + num_bytes >= search_end) {
+enospc:
+ search_start = orig_search_start;
+ if (full_scan) {
+ ret = -ENOSPC;
+ goto error;
+ }
+ if (wrapped) {
+ if (!full_scan)
+ total_needed -= empty_size;
+ full_scan = 1;
+ } else
+ wrapped = 1;
+ }
+ block_group = btrfs_lookup_block_group(info, search_start);
+ cond_resched();
+ if (!full_scan)
+ block_group = btrfs_find_block_group(root, block_group,
+ search_start, data, 0);
+ goto check_failed;
+
error:
btrfs_release_path(root, path);
btrfs_free_path(path);
*/
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 owner,
- u64 num_blocks, u64 search_start,
- u64 search_end, struct btrfs_key *ins)
+ u64 num_bytes, u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins, int data)
{
int ret;
int pending_ret;
- u64 super_blocks_used;
+ u64 super_used, root_used;
+ u64 search_start = 0;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
- struct btrfs_key prealloc_key;
- btrfs_set_extent_refs(&extent_item, 1);
- btrfs_set_extent_owner(&extent_item, owner);
+ btrfs_set_stack_extent_refs(&extent_item, 1);
+ btrfs_set_stack_extent_owner(&extent_item, owner);
- if (root == extent_root) {
- int nr;
- BUG_ON(info->extent_tree_prealloc_nr == 0);
- BUG_ON(num_blocks != 1);
- ins->offset = 1;
- info->extent_tree_prealloc_nr--;
- nr = info->extent_tree_prealloc_nr;
- ins->objectid = info->extent_tree_prealloc[nr];
- info->extent_tree_insert[info->extent_tree_insert_nr++] =
- ins->objectid;
- ret = update_block_group(trans, root,
- ins->objectid, ins->offset, 1);
- BUG_ON(ret);
- return 0;
- }
- /* do the real allocation */
- ret = find_free_extent(trans, root, num_blocks, search_start,
- search_end, ins);
+ WARN_ON(num_bytes < root->sectorsize);
+ ret = find_free_extent(trans, root, num_bytes, empty_size,
+ search_start, search_end, hint_byte, ins,
+ trans->alloc_exclude_start,
+ trans->alloc_exclude_nr, data);
+ BUG_ON(ret);
if (ret)
return ret;
- /* then do prealloc for the extent tree */
- ret = find_free_extent(trans, root, 0, ins->objectid + ins->offset,
- search_end, &prealloc_key);
- if (ret)
- return ret;
+ /* block accounting for super block */
+ super_used = btrfs_super_bytes_used(&info->super_copy);
+ btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
+
+ /* block accounting for root item */
+ root_used = btrfs_root_used(&root->root_item);
+ btrfs_set_root_used(&root->root_item, root_used + num_bytes);
+
+ clear_extent_dirty(&root->fs_info->free_space_cache,
+ ins->objectid, ins->objectid + ins->offset - 1,
+ GFP_NOFS);
+
+ if (root == extent_root) {
+ set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
+ ins->objectid + ins->offset - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ WARN_ON(data == 1);
+ goto update_block;
+ }
- super_blocks_used = btrfs_super_blocks_used(info->disk_super);
- btrfs_set_super_blocks_used(info->disk_super, super_blocks_used +
- num_blocks);
+ WARN_ON(trans->alloc_exclude_nr);
+ trans->alloc_exclude_start = ins->objectid;
+ trans->alloc_exclude_nr = ins->offset;
ret = btrfs_insert_item(trans, extent_root, ins, &extent_item,
sizeof(extent_item));
+ trans->alloc_exclude_start = 0;
+ trans->alloc_exclude_nr = 0;
+
+ BUG_ON(ret);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
- if (ret)
+
+ if (ret) {
return ret;
- if (pending_ret)
+ }
+ if (pending_ret) {
return pending_ret;
- ret = update_block_group(trans, root, ins->objectid, ins->offset, 1);
+ }
+
+update_block:
+ ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0,
+ data);
+ BUG_ON(ret);
return 0;
}
* helper function to allocate a block for a given tree
* returns the tree buffer or NULL.
*/
-struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u32 blocksize, u64 hint,
+ u64 empty_size)
{
struct btrfs_key ins;
int ret;
- struct buffer_head *buf;
+ struct extent_buffer *buf;
ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
- 1, 0, (unsigned long)-1, &ins);
+ blocksize, empty_size, hint,
+ (u64)-1, &ins, 0);
if (ret) {
- BUG();
- return NULL;
+ BUG_ON(ret > 0);
+ return ERR_PTR(ret);
}
- BUG_ON(ret);
- buf = btrfs_find_create_tree_block(root, ins.objectid);
- set_buffer_uptodate(buf);
+ buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
+ if (!buf) {
+ btrfs_free_extent(trans, root, ins.objectid, blocksize, 0);
+ return ERR_PTR(-ENOMEM);
+ }
+ btrfs_set_buffer_uptodate(buf);
+ set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
+ buf->start + buf->len - 1, GFP_NOFS);
+ set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree,
+ buf->start, buf->start + buf->len - 1,
+ EXTENT_CSUM, GFP_NOFS);
+ buf->flags |= EXTENT_CSUM;
+ btrfs_set_buffer_defrag(buf);
+ trans->blocks_used++;
return buf;
}
static int drop_leaf_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct buffer_head *cur)
+ struct btrfs_root *root, struct extent_buffer *leaf)
{
- struct btrfs_disk_key *key;
- struct btrfs_leaf *leaf;
+ struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
int nritems;
int ret;
- BUG_ON(!btrfs_is_leaf(btrfs_buffer_node(cur)));
- leaf = btrfs_buffer_leaf(cur);
- nritems = btrfs_header_nritems(&leaf->header);
+ BUG_ON(!btrfs_is_leaf(leaf));
+ nritems = btrfs_header_nritems(leaf);
for (i = 0; i < nritems; i++) {
- key = &leaf->items[i].key;
- if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
+ u64 disk_bytenr;
+
+ btrfs_item_key_to_cpu(leaf, &key, i);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(fi) == BTRFS_FILE_EXTENT_INLINE)
+ if (btrfs_file_extent_type(leaf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
continue;
/*
* FIXME make sure to insert a trans record that
* repeats the snapshot del on crash
*/
- ret = btrfs_free_extent(trans, root,
- btrfs_file_extent_disk_blocknr(fi),
- btrfs_file_extent_disk_num_blocks(fi),
- 0);
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ if (disk_bytenr == 0)
+ continue;
+ ret = btrfs_free_extent(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(leaf, fi), 0);
BUG_ON(ret);
}
return 0;
}
+static void reada_walk_down(struct btrfs_root *root,
+ struct extent_buffer *node)
+{
+ int i;
+ u32 nritems;
+ u64 bytenr;
+ int ret;
+ u32 refs;
+ int level;
+ u32 blocksize;
+
+ nritems = btrfs_header_nritems(node);
+ level = btrfs_header_level(node);
+ for (i = 0; i < nritems; i++) {
+ bytenr = btrfs_node_blockptr(node, i);
+ blocksize = btrfs_level_size(root, level - 1);
+ ret = lookup_extent_ref(NULL, root, bytenr, blocksize, &refs);
+ BUG_ON(ret);
+ if (refs != 1)
+ continue;
+ mutex_unlock(&root->fs_info->fs_mutex);
+ ret = readahead_tree_block(root, bytenr, blocksize);
+ cond_resched();
+ mutex_lock(&root->fs_info->fs_mutex);
+ if (ret)
+ break;
+ }
+}
+
/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
- struct buffer_head *next;
- struct buffer_head *cur;
- u64 blocknr;
+ struct extent_buffer *next;
+ struct extent_buffer *cur;
+ u64 bytenr;
+ u32 blocksize;
int ret;
u32 refs;
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = lookup_extent_ref(trans, root, bh_blocknr(path->nodes[*level]),
- 1, &refs);
+ ret = lookup_extent_ref(trans, root,
+ path->nodes[*level]->start,
+ path->nodes[*level]->len, &refs);
BUG_ON(ret);
if (refs > 1)
goto out;
+
/*
* walk down to the last node level and free all the leaves
*/
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
cur = path->nodes[*level];
- if (btrfs_header_level(btrfs_buffer_header(cur)) != *level)
+
+ if (*level > 0 && path->slots[*level] == 0)
+ reada_walk_down(root, cur);
+
+ if (btrfs_header_level(cur) != *level)
WARN_ON(1);
+
if (path->slots[*level] >=
- btrfs_header_nritems(btrfs_buffer_header(cur)))
+ btrfs_header_nritems(cur))
break;
if (*level == 0) {
ret = drop_leaf_ref(trans, root, cur);
BUG_ON(ret);
break;
}
- blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur),
- path->slots[*level]);
- ret = lookup_extent_ref(trans, root, blocknr, 1, &refs);
+ bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
+ blocksize = btrfs_level_size(root, *level - 1);
+ ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
path->slots[*level]++;
- ret = btrfs_free_extent(trans, root, blocknr, 1, 1);
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize, 1);
BUG_ON(ret);
continue;
}
- next = read_tree_block(root, blocknr);
+ next = btrfs_find_tree_block(root, bytenr, blocksize);
+ if (!next || !btrfs_buffer_uptodate(next)) {
+ free_extent_buffer(next);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ next = read_tree_block(root, bytenr, blocksize);
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ /* we dropped the lock, check one more time */
+ ret = lookup_extent_ref(trans, root, bytenr,
+ blocksize, &refs);
+ BUG_ON(ret);
+ if (refs != 1) {
+ path->slots[*level]++;
+ free_extent_buffer(next);
+ ret = btrfs_free_extent(trans, root,
+ bytenr, blocksize, 1);
+ BUG_ON(ret);
+ continue;
+ }
+ }
WARN_ON(*level <= 0);
if (path->nodes[*level-1])
- btrfs_block_release(root, path->nodes[*level-1]);
+ free_extent_buffer(path->nodes[*level-1]);
path->nodes[*level-1] = next;
- *level = btrfs_header_level(btrfs_buffer_header(next));
+ *level = btrfs_header_level(next);
path->slots[*level] = 0;
}
out:
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = btrfs_free_extent(trans, root,
- bh_blocknr(path->nodes[*level]), 1, 1);
- btrfs_block_release(root, path->nodes[*level]);
+ ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
+ path->nodes[*level]->len, 1);
+ free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
BUG_ON(ret);
int i;
int slot;
int ret;
+ struct btrfs_root_item *root_item = &root->root_item;
+
for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
slot = path->slots[i];
- if (slot < btrfs_header_nritems(
- btrfs_buffer_header(path->nodes[i])) - 1) {
+ if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
+ struct extent_buffer *node;
+ struct btrfs_disk_key disk_key;
+ node = path->nodes[i];
path->slots[i]++;
*level = i;
+ WARN_ON(*level == 0);
+ btrfs_node_key(node, &disk_key, path->slots[i]);
+ memcpy(&root_item->drop_progress,
+ &disk_key, sizeof(disk_key));
+ root_item->drop_level = i;
return 0;
} else {
ret = btrfs_free_extent(trans, root,
- bh_blocknr(path->nodes[*level]),
- 1, 1);
+ path->nodes[*level]->start,
+ path->nodes[*level]->len, 1);
BUG_ON(ret);
- btrfs_block_release(root, path->nodes[*level]);
+ free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level = i + 1;
}
* decremented.
*/
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct buffer_head *snap)
+ *root)
{
int ret = 0;
int wret;
struct btrfs_path *path;
int i;
int orig_level;
+ struct btrfs_root_item *root_item = &root->root_item;
path = btrfs_alloc_path();
BUG_ON(!path);
- btrfs_init_path(path);
- level = btrfs_header_level(btrfs_buffer_header(snap));
+ level = btrfs_header_level(root->node);
orig_level = level;
- path->nodes[level] = snap;
- path->slots[level] = 0;
+ if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
+ path->nodes[level] = root->node;
+ extent_buffer_get(root->node);
+ path->slots[level] = 0;
+ } else {
+ struct btrfs_key key;
+ struct btrfs_disk_key found_key;
+ struct extent_buffer *node;
+
+ btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
+ level = root_item->drop_level;
+ path->lowest_level = level;
+ wret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (wret < 0) {
+ ret = wret;
+ goto out;
+ }
+ node = path->nodes[level];
+ btrfs_node_key(node, &found_key, path->slots[level]);
+ WARN_ON(memcmp(&found_key, &root_item->drop_progress,
+ sizeof(found_key)));
+ }
while(1) {
wret = walk_down_tree(trans, root, path, &level);
if (wret > 0)
break;
if (wret < 0)
ret = wret;
+ ret = -EAGAIN;
+ break;
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {
- btrfs_block_release(root, path->nodes[i]);
+ free_extent_buffer(path->nodes[i]);
+ path->nodes[i] = NULL;
}
}
+out:
btrfs_free_path(path);
return ret;
}
int btrfs_free_block_groups(struct btrfs_fs_info *info)
{
+ u64 start;
+ u64 end;
+ u64 ptr;
int ret;
- struct btrfs_block_group_cache *cache[8];
- int i;
-
while(1) {
- ret = radix_tree_gang_lookup(&info->block_group_radix,
- (void **)cache, 0,
- ARRAY_SIZE(cache));
+ ret = find_first_extent_bit(&info->block_group_cache, 0,
+ &start, &end, (unsigned int)-1);
+ if (ret)
+ break;
+ ret = get_state_private(&info->block_group_cache, start, &ptr);
if (!ret)
+ kfree((void *)(unsigned long)ptr);
+ clear_extent_bits(&info->block_group_cache, start,
+ end, (unsigned int)-1, GFP_NOFS);
+ }
+ while(1) {
+ ret = find_first_extent_bit(&info->free_space_cache, 0,
+ &start, &end, EXTENT_DIRTY);
+ if (ret)
break;
- for (i = 0; i < ret; i++) {
- radix_tree_delete(&info->block_group_radix,
- cache[i]->key.objectid +
- cache[i]->key.offset - 1);
- kfree(cache[i]);
- }
+ clear_extent_dirty(&info->free_space_cache, start,
+ end, GFP_NOFS);
}
return 0;
}
struct btrfs_path *path;
int ret;
int err = 0;
- struct btrfs_block_group_item *bi;
+ int bit;
struct btrfs_block_group_cache *cache;
+ struct btrfs_fs_info *info = root->fs_info;
+ struct extent_map_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
- struct btrfs_leaf *leaf;
- u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize;
+ struct extent_buffer *leaf;
- root = root->fs_info->extent_root;
+ block_group_cache = &info->block_group_cache;
+
+ root = info->extent_root;
key.objectid = 0;
- key.offset = group_size_blocks;
- key.flags = 0;
+ key.offset = BTRFS_BLOCK_GROUP_SIZE;
btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
path = btrfs_alloc_path();
return -ENOMEM;
while(1) {
- ret = btrfs_search_slot(NULL, root->fs_info->extent_root,
+ ret = btrfs_search_slot(NULL, info->extent_root,
&key, path, 0, 0);
if (ret != 0) {
err = ret;
break;
}
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- btrfs_disk_key_to_cpu(&found_key,
- &leaf->items[path->slots[0]].key);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
cache = kmalloc(sizeof(*cache), GFP_NOFS);
if (!cache) {
err = -1;
break;
}
- bi = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_block_group_item);
- memcpy(&cache->item, bi, sizeof(*bi));
+
+ read_extent_buffer(leaf, &cache->item,
+ btrfs_item_ptr_offset(leaf, path->slots[0]),
+ sizeof(cache->item));
memcpy(&cache->key, &found_key, sizeof(found_key));
- cache->last_alloc = 0;
- cache->first_free = 0;
+ cache->cached = 0;
+
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(root, path);
- ret = radix_tree_insert(&root->fs_info->block_group_radix,
- found_key.objectid +
- found_key.offset - 1,
- (void *)cache);
- BUG_ON(ret);
+
+ if (cache->item.flags & BTRFS_BLOCK_GROUP_MIXED) {
+ bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
+ cache->data = BTRFS_BLOCK_GROUP_MIXED;
+ } else if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) {
+ bit = BLOCK_GROUP_DATA;
+ cache->data = BTRFS_BLOCK_GROUP_DATA;
+ } else {
+ bit = BLOCK_GROUP_METADATA;
+ cache->data = 0;
+ }
+
+ /* use EXTENT_LOCKED to prevent merging */
+ set_extent_bits(block_group_cache, found_key.objectid,
+ found_key.objectid + found_key.offset - 1,
+ bit | EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(block_group_cache, found_key.objectid,
+ (unsigned long)cache);
+
if (key.objectid >=
- btrfs_super_total_blocks(root->fs_info->disk_super))
+ btrfs_super_total_bytes(&info->super_copy))
break;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff