-#include <linux/module.h>
-#include <linux/radix-tree.h>
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/sched.h>
+#include <linux/crc32c.h>
+#include "hash.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 cache_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *block_group)
+{
+ 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;
+
+ if (!block_group)
+ return 0;
+
+ root = root->fs_info->extent_root;
+ free_space_cache = &root->fs_info->free_space_cache;
+
+ if (block_group->cached)
+ return 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) {
+ 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 (btrfs_key_type(&key) != BTRFS_EXTENT_REF_KEY &&
+ 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;
+ }
+
+ 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 = 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;
+ }
+ 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 full_scan)
+{
+ 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;
+
+ if (!cache) {
+ goto out;
+ }
+again:
+ ret = cache_block_group(root, cache);
+ if (ret)
+ goto out;
+
+ last = max(search_start, cache->key.objectid);
+
+ while(1) {
+ 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:
+ cache = btrfs_lookup_block_group(root->fs_info, search_start);
+ if (!cache) {
+ printk("Unable to find block group for %Lu\n",
+ search_start);
+ WARN_ON(1);
+ return search_start;
+ }
+ return search_start;
+
+new_group:
+ last = cache->key.objectid + cache->key.offset;
+wrapped:
+ cache = btrfs_lookup_block_group(root->fs_info, last);
+ if (!cache) {
+no_cache:
+ if (!wrapped) {
+ wrapped = 1;
+ last = search_start;
+ data = BTRFS_BLOCK_GROUP_MIXED;
+ goto wrapped;
+ }
+ goto out;
+ }
+ 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);
+ if (!cache)
+ goto no_cache;
+ *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 + shint->pinned <
+ div_factor(shint->key.offset, factor)) {
+ return shint;
+ }
+ }
+ }
+ if (hint && (hint->data == data ||
+ hint->data == BTRFS_BLOCK_GROUP_MIXED)) {
+ used = btrfs_block_group_used(&hint->item);
+ if (used + hint->pinned <
+ 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 + cache->pinned < 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;
+}
+
+static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
+{
+ u32 high_crc = ~(u32)0;
+ u32 low_crc = ~(u32)0;
+ __le64 lenum;
+
+ lenum = cpu_to_le64(root_objectid);
+ high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
+ lenum = cpu_to_le64(ref_generation);
+ low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+
+#if 0
+ lenum = cpu_to_le64(owner);
+ low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+ lenum = cpu_to_le64(owner_offset);
+ low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+#endif
+ return ((u64)high_crc << 32) | (u64)low_crc;
+}
+
+static int match_extent_ref(struct extent_buffer *leaf,
+ struct btrfs_extent_ref *disk_ref,
+ struct btrfs_extent_ref *cpu_ref)
+{
+ int ret;
+ int len;
+
+ if (cpu_ref->objectid)
+ len = sizeof(*cpu_ref);
+ else
+ len = 2 * sizeof(u64);
+ ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
+ len);
+ return ret == 0;
+}
+
+static int lookup_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 bytenr,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset, int del)
+{
+ u64 hash;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_extent_ref ref;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *disk_ref;
+ int ret;
+ int ret2;
+
+ btrfs_set_stack_ref_root(&ref, root_objectid);
+ btrfs_set_stack_ref_generation(&ref, ref_generation);
+ btrfs_set_stack_ref_objectid(&ref, owner);
+ btrfs_set_stack_ref_offset(&ref, owner_offset);
+
+ hash = hash_extent_ref(root_objectid, ref_generation, owner,
+ owner_offset);
+ key.offset = hash;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ while (1) {
+ ret = btrfs_search_slot(trans, root, &key, path,
+ del ? -1 : 0, del);
+ if (ret < 0)
+ goto out;
+ leaf = path->nodes[0];
+ if (ret != 0) {
+ u32 nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret2 = btrfs_next_leaf(root, path);
+ if (ret2)
+ goto out;
+ leaf = path->nodes[0];
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid != bytenr ||
+ found_key.type != BTRFS_EXTENT_REF_KEY)
+ goto out;
+ key.offset = found_key.offset;
+ if (del) {
+ btrfs_release_path(root, path);
+ continue;
+ }
+ }
+ disk_ref = btrfs_item_ptr(path->nodes[0],
+ path->slots[0],
+ struct btrfs_extent_ref);
+ if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
+ ret = 0;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ key.offset = found_key.offset + 1;
+ btrfs_release_path(root, path);
+ }
+out:
+ return ret;
+}
+
/*
- * pending extents are blocks that we're trying to allocate in the extent
- * map while trying to grow the map because of other allocations. To avoid
- * recursing, they are tagged in the radix tree and cleaned up after
- * other allocations are done. The pending tag is also used in the same
- * manner for deletes.
+ * Back reference rules. Back refs have three main goals:
+ *
+ * 1) differentiate between all holders of references to an extent so that
+ * when a reference is dropped we can make sure it was a valid reference
+ * before freeing the extent.
+ *
+ * 2) Provide enough information to quickly find the holders of an extent
+ * if we notice a given block is corrupted or bad.
+ *
+ * 3) Make it easy to migrate blocks for FS shrinking or storage pool
+ * maintenance. This is actually the same as #2, but with a slightly
+ * different use case.
+ *
+ * File extents can be referenced by:
+ *
+ * - multiple snapshots, subvolumes, or different generations in one subvol
+ * - different files inside a single subvolume (in theory, not implemented yet)
+ * - different offsets inside a file (bookend extents in file.c)
+ *
+ * The extent ref structure has fields for:
+ *
+ * - Objectid of the subvolume root
+ * - Generation number of the tree holding the reference
+ * - objectid of the file holding the reference
+ * - offset in the file corresponding to the key holding the reference
+ *
+ * When a file extent is allocated the fields are filled in:
+ * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ *
+ * When a leaf is cow'd new references are added for every file extent found
+ * in the leaf. It looks the same as the create case, but trans->transid
+ * will be different when the block is cow'd.
+ *
+ * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ *
+ * When a file extent is removed either during snapshot deletion or file
+ * truncation, the corresponding back reference is found
+ * by searching for:
+ *
+ * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
+ * inode objectid, offset in file)
+ *
+ * Btree extents can be referenced by:
+ *
+ * - Different subvolumes
+ * - Different generations of the same subvolume
+ *
+ * Storing sufficient information for a full reverse mapping of a btree
+ * block would require storing the lowest key of the block in the backref,
+ * and it would require updating that lowest key either before write out or
+ * every time it changed. Instead, the objectid of the lowest key is stored
+ * along with the level of the tree block. This provides a hint
+ * about where in the btree the block can be found. Searches through the
+ * btree only need to look for a pointer to that block, so they stop one
+ * level higher than the level recorded in the backref.
+ *
+ * Some btrees do not do reference counting on their extents. These
+ * include the extent tree and the tree of tree roots. Backrefs for these
+ * trees always have a generation of zero.
+ *
+ * When a tree block is created, back references are inserted:
+ *
+ * (root->root_key.objectid, trans->transid or zero, lowest_key_objectid, level)
+ *
+ * When a tree block is cow'd in a reference counted root,
+ * new back references are added for all the blocks it points to.
+ * These are of the form (trans->transid will have increased since creation):
+ *
+ * (root->root_key.objectid, trans->transid, lowest_key_objectid, level)
+ *
+ * Because the lowest_key_objectid and the level are just hints
+ * they are not used when backrefs are deleted. When a backref is deleted:
+ *
+ * if backref was for a tree root:
+ * root_objectid = root->root_key.objectid
+ * else
+ * root_objectid = btrfs_header_owner(parent)
+ *
+ * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
+ *
+ * Back Reference Key hashing:
+ *
+ * Back references have four fields, each 64 bits long. Unfortunately,
+ * This is hashed into a single 64 bit number and placed into the key offset.
+ * The key objectid corresponds to the first byte in the extent, and the
+ * key type is set to BTRFS_EXTENT_REF_KEY
*/
-#define CTREE_EXTENT_PENDING_DEL 0
-#define CTREE_EXTENT_PINNED 1
+int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 bytenr,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
+{
+ u64 hash;
+ struct btrfs_key key;
+ struct btrfs_extent_ref ref;
+ struct btrfs_extent_ref *disk_ref;
+ int ret;
+
+ btrfs_set_stack_ref_root(&ref, root_objectid);
+ btrfs_set_stack_ref_generation(&ref, ref_generation);
+ btrfs_set_stack_ref_objectid(&ref, owner);
+ btrfs_set_stack_ref_offset(&ref, owner_offset);
+
+ hash = hash_extent_ref(root_objectid, ref_generation, owner,
+ owner_offset);
+ key.offset = hash;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
+ while (ret == -EEXIST) {
+ disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ if (match_extent_ref(path->nodes[0], disk_ref, &ref))
+ goto out;
+ key.offset++;
+ btrfs_release_path(root, path);
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ sizeof(ref));
+ }
+ if (ret)
+ goto out;
+ disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
+ sizeof(ref));
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+out:
+ btrfs_release_path(root, path);
+ return ret;
+}
-static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 blocknr)
+int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
{
- struct btrfs_path path;
+ 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);
- btrfs_init_path(&path);
- key.objectid = blocknr;
- key.flags = 0;
+ WARN_ON(num_bytes < root->sectorsize);
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- key.offset = 1;
- ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, &path,
+ key.offset = num_bytes;
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 1);
- if (ret != 0)
+ if (ret < 0)
+ return ret;
+ if (ret != 0) {
BUG();
+ }
BUG_ON(ret != 0);
- l = btrfs_buffer_leaf(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);
+ l = path->nodes[0];
+ item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
+ 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);
+
+ ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
+ path, bytenr, root_objectid,
+ ref_generation, owner, owner_offset);
+ BUG_ON(ret);
+ finish_current_insert(trans, root->fs_info->extent_root);
+ del_pending_extents(trans, root->fs_info->extent_root);
+
+ btrfs_free_path(path);
+ return 0;
+}
- btrfs_release_path(root->fs_info->extent_root, &path);
+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_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 blocknr, u32 *refs)
+
+static int lookup_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs)
+{
+ struct btrfs_path *path;
+ int ret;
+ struct btrfs_key key;
+ struct extent_buffer *l;
+ struct btrfs_extent_item *item;
+
+ WARN_ON(num_bytes < root->sectorsize);
+ path = btrfs_alloc_path();
+ 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)
+ goto out;
+ if (ret != 0) {
+ btrfs_print_leaf(root, path->nodes[0]);
+ printk("failed to find block number %Lu\n", bytenr);
+ BUG();
+ }
+ l = path->nodes[0];
+ item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
+ *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, u64 owner_objectid)
+{
+ u64 generation;
+ u64 key_objectid;
+ u64 level;
+ u32 nritems;
+ struct btrfs_disk_key disk_key;
+
+ level = btrfs_header_level(root->node);
+ generation = trans->transid;
+ nritems = btrfs_header_nritems(root->node);
+ if (nritems > 0) {
+ if (level == 0)
+ btrfs_item_key(root->node, &disk_key, 0);
+ else
+ btrfs_node_key(root->node, &disk_key, 0);
+ key_objectid = btrfs_disk_key_objectid(&disk_key);
+ } else {
+ key_objectid = 0;
+ }
+ return btrfs_inc_extent_ref(trans, root, root->node->start,
+ root->node->len, owner_objectid,
+ generation, 0, 0);
+}
+
+int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ u64 bytenr;
+ u32 nritems;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ int i;
+ int level;
+ int ret;
+ int faili;
+
+ if (!root->ref_cows)
+ return 0;
+
+ 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, 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;
+ ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ root->root_key.objectid, trans->transid,
+ key.objectid, key.offset);
+ if (ret) {
+ faili = i;
+ goto fail;
+ }
+ } else {
+ bytenr = btrfs_node_blockptr(buf, i);
+ ret = btrfs_inc_extent_ref(trans, root, bytenr,
+ btrfs_level_size(root, level - 1),
+ root->root_key.objectid,
+ trans->transid, 0, 0);
+ if (ret) {
+ faili = i;
+ goto fail;
+ }
+ }
+ }
+ return 0;
+fail:
+ WARN_ON(1);
+#if 0
+ 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);
+ }
+ }
+#endif
+ return ret;
+}
+
+static int write_one_cache_group(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_block_group_cache *cache)
+{
+ int ret;
+ int pending_ret;
+ struct btrfs_root *extent_root = root->fs_info->extent_root;
+ unsigned long bi;
+ struct extent_buffer *leaf;
+
+ ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
+ if (ret < 0)
+ goto fail;
+ BUG_ON(ret);
+
+ 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)
+ return ret;
+ if (pending_ret)
+ return pending_ret;
+ return 0;
+
+}
+
+int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct extent_map_tree *block_group_cache;
+ struct btrfs_block_group_cache *cache;
+ int ret;
+ int err = 0;
+ int werr = 0;
+ 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 = 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;
+
+ 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 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_bytes;
+ u64 old_val;
+ u64 byte_in_group;
+ u64 start;
+ u64 end;
+
+ while(total) {
+ cache = btrfs_lookup_block_group(info, bytenr);
+ if (!cache) {
+ return -1;
+ }
+ 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_bytes = min(total, cache->key.offset - byte_in_group);
+ if (alloc) {
+ 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_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;
+}
+static int update_pinned_extents(struct btrfs_root *root,
+ u64 bytenr, u64 num, int pin)
{
- struct btrfs_path path;
- int ret;
- struct btrfs_key key;
- struct btrfs_leaf *l;
- struct btrfs_extent_item *item;
- btrfs_init_path(&path);
- key.objectid = blocknr;
- key.offset = 1;
- key.flags = 0;
- 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)
- BUG();
- l = btrfs_buffer_leaf(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);
+ u64 len;
+ struct btrfs_block_group_cache *cache;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+
+ if (pin) {
+ set_extent_dirty(&fs_info->pinned_extents,
+ bytenr, bytenr + num - 1, GFP_NOFS);
+ } else {
+ clear_extent_dirty(&fs_info->pinned_extents,
+ bytenr, bytenr + num - 1, GFP_NOFS);
+ }
+ while (num > 0) {
+ cache = btrfs_lookup_block_group(fs_info, bytenr);
+ WARN_ON(!cache);
+ len = min(num, cache->key.offset -
+ (bytenr - cache->key.objectid));
+ if (pin) {
+ cache->pinned += len;
+ fs_info->total_pinned += len;
+ } else {
+ cache->pinned -= len;
+ fs_info->total_pinned -= len;
+ }
+ bytenr += len;
+ num -= len;
+ }
return 0;
}
-int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct buffer_head *buf)
+int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy)
{
- u64 blocknr;
- struct btrfs_node *buf_node;
- int i;
-
- if (!root->ref_cows)
- return 0;
- buf_node = btrfs_buffer_node(buf);
- if (btrfs_is_leaf(buf_node))
- return 0;
+ u64 last = 0;
+ u64 start;
+ u64 end;
+ struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents;
+ int ret;
- for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) {
- blocknr = btrfs_node_blockptr(buf_node, i);
- inc_block_ref(trans, root, blocknr);
+ while(1) {
+ ret = find_first_extent_bit(pinned_extents, last,
+ &start, &end, EXTENT_DIRTY);
+ if (ret)
+ break;
+ set_extent_dirty(copy, start, end, GFP_NOFS);
+ last = end + 1;
}
return 0;
}
-int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
- btrfs_root *root)
+int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_map_tree *unpin)
{
- unsigned long gang[8];
- u64 first = 0;
+ u64 start;
+ u64 end;
int ret;
- int i;
+ struct extent_map_tree *free_space_cache;
+ free_space_cache = &root->fs_info->free_space_cache;
while(1) {
- ret = radix_tree_gang_lookup_tag(&root->fs_info->pinned_radix,
- (void **)gang, 0,
- ARRAY_SIZE(gang),
- CTREE_EXTENT_PINNED);
- if (!ret)
+ ret = find_first_extent_bit(unpin, 0, &start, &end,
+ EXTENT_DIRTY);
+ if (ret)
break;
- if (!first)
- first = gang[0];
- for (i = 0; i < ret; i++) {
- radix_tree_delete(&root->fs_info->pinned_radix,
- gang[i]);
- }
+ update_pinned_extents(root, start, end + 1 - start, 0);
+ clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ set_extent_dirty(free_space_cache, start, end, GFP_NOFS);
}
- root->fs_info->last_insert.objectid = first;
- root->fs_info->last_insert.offset = 0;
return 0;
}
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root)
{
+ u64 start;
+ u64 end;
+ struct btrfs_fs_info *info = extent_root->fs_info;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
struct btrfs_key ins;
+ struct btrfs_disk_key first;
struct btrfs_extent_item extent_item;
- int i;
int ret;
- u64 super_blocks_used;
- struct btrfs_fs_info *info = extent_root->fs_info;
+ int level;
+ int err = 0;
- btrfs_set_extent_refs(&extent_item, 1);
- btrfs_set_extent_owner(&extent_item,
- btrfs_header_parentid(btrfs_buffer_header(extent_root->node)));
- ins.offset = 1;
- ins.flags = 0;
+ btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
+ path = btrfs_alloc_path();
- for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) {
- ins.objectid = extent_root->fs_info->current_insert.objectid +
- 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);
+ 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);
+ eb = read_tree_block(extent_root, ins.objectid, ins.offset);
+ level = btrfs_header_level(eb);
+ if (level == 0) {
+ btrfs_item_key(eb, &first, 0);
+ } else {
+ btrfs_node_key(eb, &first, 0);
+ }
+ err = btrfs_insert_extent_backref(trans, extent_root, path,
+ start, extent_root->root_key.objectid,
+ 0, btrfs_disk_key_objectid(&first),
+ level);
+ BUG_ON(err);
+ free_extent_buffer(eb);
}
- extent_root->fs_info->current_insert.offset = 0;
+ btrfs_free_path(path);
return 0;
}
-static int pin_down_block(struct btrfs_root *root, u64 blocknr, int tag)
+static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
+ int pending)
{
- int err;
- err = radix_tree_insert(&root->fs_info->pinned_radix,
- blocknr, (void *)blocknr);
- BUG_ON(err);
- if (err)
- return err;
- radix_tree_tag_set(&root->fs_info->pinned_radix, blocknr,
- tag);
+ int err = 0;
+ struct extent_buffer *buf;
+
+ if (!pending) {
+ buf = btrfs_find_tree_block(root, bytenr, num_bytes);
+ if (buf) {
+ if (btrfs_buffer_uptodate(buf)) {
+ u64 transid =
+ root->fs_info->running_transaction->transid;
+ if (btrfs_header_generation(buf) == transid) {
+ free_extent_buffer(buf);
+ return 1;
+ }
+ }
+ free_extent_buffer(buf);
+ }
+ update_pinned_extents(root, bytenr, num_bytes, 1);
+ } else {
+ set_extent_bits(&root->fs_info->pending_del,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ }
+ 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)
+ *root, u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin,
+ int mark_free)
{
- struct btrfs_path path;
+ 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);
- btrfs_init_path(&path);
- 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();
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ if (ref_generation && owner_objectid == 0 && root_objectid == 3) {
+//printk("drop backref root %Lu gen %Lu byte %Lu\n", root_objectid, ref_generation, bytenr );
}
- ei = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
+ ret = lookup_extent_backref(trans, extent_root, path,
+ bytenr, root_objectid,
+ ref_generation,
+ owner_objectid, owner_offset, 1);
+ if (ret == 0) {
+ ret = btrfs_del_item(trans, extent_root, path);
+ } else {
+ btrfs_print_leaf(extent_root, path->nodes[0]);
+ WARN_ON(1);
+ printk("Unable to find ref byte nr %Lu root %Lu "
+ " gen %Lu owner %Lu offset %Lu\n", bytenr,
+ root_objectid, ref_generation, owner_objectid,
+ owner_offset);
+ }
+ btrfs_release_path(extent_root, path);
+ ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
+ 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);
+ 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;
- super_blocks_used = btrfs_super_blocks_used(info->disk_super);
- btrfs_set_super_blocks_used(info->disk_super,
- super_blocks_used - num_blocks);
- ret = btrfs_del_item(trans, extent_root, &path);
- if (extent_root->fs_info->last_insert.objectid >
- blocknr)
- extent_root->fs_info->last_insert.objectid = blocknr;
- if (ret)
- BUG();
+ u64 super_used;
+ u64 root_used;
+
+ if (pin) {
+ ret = pin_down_bytes(root, bytenr, num_bytes, 0);
+ if (ret > 0)
+ mark_free = 1;
+ BUG_ON(ret < 0);
+ }
+
+ /* 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) {
+ 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 *radix = &extent_root->fs_info->pinned_radix;
+ u64 start;
+ u64 end;
+ struct extent_map_tree *pending_del;
+ struct extent_map_tree *pinned_extents;
+
+ pending_del = &extent_root->fs_info->pending_del;
+ pinned_extents = &extent_root->fs_info->pinned_extents;
while(1) {
- ret = radix_tree_gang_lookup_tag(
- &extent_root->fs_info->pinned_radix,
- (void **)gang, 0,
- ARRAY_SIZE(gang),
- CTREE_EXTENT_PENDING_DEL);
- if (!ret)
+ ret = find_first_extent_bit(pending_del, 0, &start, &end,
+ EXTENT_LOCKED);
+ if (ret)
break;
- for (i = 0; i < ret; i++) {
- radix_tree_tag_set(radix, gang[i], CTREE_EXTENT_PINNED);
- radix_tree_tag_clear(radix, gang[i],
- CTREE_EXTENT_PENDING_DEL);
- wret = __free_extent(trans, extent_root, gang[i], 1);
- if (wret)
- err = wret;
- }
+ update_pinned_extents(extent_root, start, end + 1 - start, 1);
+ clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
+ GFP_NOFS);
+ ret = __free_extent(trans, extent_root,
+ start, end + 1 - start,
+ extent_root->root_key.objectid,
+ 0, 0, 0, 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,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
- struct buffer_head *t;
int pending_ret;
int ret;
+ WARN_ON(num_bytes < root->sectorsize);
+ if (!root->ref_cows)
+ ref_generation = 0;
+
if (root == extent_root) {
- t = find_tree_block(root, blocknr);
- pin_down_block(root, blocknr, CTREE_EXTENT_PENDING_DEL);
+ pin_down_bytes(root, bytenr, num_bytes, 1);
return 0;
}
- if (pin) {
- ret = pin_down_block(root, blocknr, CTREE_EXTENT_PINNED);
- BUG_ON(ret);
- }
- ret = __free_extent(trans, root, blocknr, num_blocks);
+ ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
+ ref_generation, owner_objectid, owner_offset,
+ pin, pin == 0);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
+static u64 stripe_align(struct btrfs_root *root, u64 val)
+{
+ u64 mask = ((u64)root->stripesize - 1);
+ u64 ret = (val + mask) & ~mask;
+ return ret;
+}
+
/*
* walks the btree of allocated extents and find a hole of a given size.
* The key ins is changed to record the hole:
* 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_path *path;
struct btrfs_key key;
- int ret;
u64 hole_size = 0;
+ u64 aligned;
+ int ret;
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;
- int total_needed = num_blocks;
+ struct btrfs_fs_info *info = root->fs_info;
+ u64 total_needed = num_bytes;
int level;
+ struct btrfs_block_group_cache *block_group;
+ int full_scan = 0;
+ int wrapped = 0;
+ u64 cached_start;
- level = btrfs_header_level(btrfs_buffer_header(root->node));
- total_needed += (level + 1) * 3;
- if (root->fs_info->last_insert.objectid > search_start)
- search_start = root->fs_info->last_insert.objectid;
-
- ins->flags = 0;
+ WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
+ level = btrfs_header_level(root->node);
+
+ if (num_bytes >= 32 * 1024 * 1024 && hint_byte) {
+ data = BTRFS_BLOCK_GROUP_MIXED;
+ }
+
+ 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);
+ if (!block_group)
+ hint_byte = search_start;
+ block_group = btrfs_find_block_group(root, block_group,
+ hint_byte, data, 1);
+ } else {
+ block_group = btrfs_find_block_group(root,
+ trans->block_group,
+ search_start, data, 1);
+ }
+
+ total_needed += empty_size;
+ path = btrfs_alloc_path();
check_failed:
- btrfs_init_path(&path);
+ if (!block_group) {
+ block_group = btrfs_lookup_block_group(info, search_start);
+ if (!block_group)
+ block_group = btrfs_lookup_block_group(info,
+ orig_search_start);
+ }
+ search_start = find_search_start(root, &block_group, search_start,
+ total_needed, data, full_scan);
+ search_start = stripe_align(root, search_start);
+ cached_start = search_start;
+ btrfs_init_path(path);
ins->objectid = search_start;
ins->offset = 0;
start_found = 0;
- ret = btrfs_search_slot(trans, root, ins, &path, 0, 0);
+ path->reada = 2;
+
+ ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
if (ret < 0)
goto error;
- if (path.slots[0] > 0)
- path.slots[0]--;
+ if (path->slots[0] > 0) {
+ path->slots[0]--;
+ }
+
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+ /*
+ * walk backwards to find the first extent item key
+ */
+ while(btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0) {
+ ret = btrfs_search_slot(trans, root, ins,
+ path, 0, 0);
+ if (ret < 0)
+ goto error;
+ if (path->slots[0] > 0)
+ path->slots[0]--;
+ break;
+ }
+ } else {
+ path->slots[0]--;
+ }
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+ }
while (1) {
- l = btrfs_buffer_leaf(path.nodes[0]);
- slot = path.slots[0];
- if (slot >= btrfs_header_nritems(&l->header)) {
- ret = btrfs_next_leaf(root, &path);
+ l = path->nodes[0];
+ slot = path->slots[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;
+ aligned = stripe_align(root, search_start);
+ ins->objectid = aligned;
+ if (aligned >= search_end) {
+ ret = -ENOSPC;
+ goto error;
+ }
+ ins->offset = search_end - aligned;
start_found = 1;
goto check_pending;
}
- ins->objectid = last_block > search_start ?
- last_block : search_start;
- ins->offset = (u64)-1;
+ ins->objectid = stripe_align(root,
+ last_byte > search_start ?
+ last_byte : search_start);
+ if (search_end <= ins->objectid) {
+ ret = -ENOSPC;
+ goto error;
+ }
+ 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 (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 > total_needed) {
- 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;
+ aligned = stripe_align(root, last_byte);
+ hole_size = key.objectid - aligned;
+ if (key.objectid > aligned && hole_size >= num_bytes) {
+ ins->objectid = aligned;
+ ins->offset = hole_size;
+ goto check_pending;
}
}
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
+ if (!start_found && btrfs_key_type(&key) ==
+ BTRFS_BLOCK_GROUP_ITEM_KEY) {
+ last_byte = key.objectid;
+ start_found = 1;
+ }
+ goto next;
+ }
+
+
start_found = 1;
- last_block = key.objectid + key.offset;
- path.slots[0]++;
+ 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);
+ btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
- for (test_block = ins->objectid;
- test_block < ins->objectid + total_needed; test_block++) {
- if (radix_tree_lookup(&root->fs_info->pinned_radix,
- test_block)) {
- search_start = test_block + 1;
- goto check_failed;
- }
- }
- BUG_ON(root->fs_info->current_insert.offset);
- root->fs_info->current_insert.offset = total_needed - num_blocks;
- root->fs_info->current_insert.objectid = ins->objectid + num_blocks;
- root->fs_info->current_insert.flags = 0;
- root->fs_info->last_insert.objectid = ins->objectid;
- ins->offset = num_blocks;
+
+ 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 (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 (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;
+ }
+ 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_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;
+ data = BTRFS_BLOCK_GROUP_MIXED;
+ } else
+ wrapped = 1;
+ }
+ block_group = btrfs_lookup_block_group(info, search_start);
+ cond_resched();
+ block_group = btrfs_find_block_group(root, block_group,
+ search_start, data, 0);
+ goto check_failed;
+
error:
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
-
/*
* finds a free extent and does all the dirty work required for allocation
* returns the key for the extent through ins, and a tree buffer for
*
* returns 0 if everything worked, non-zero otherwise.
*/
-static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 num_blocks, u64 search_start, u64
- search_end, u64 owner, struct btrfs_key *ins)
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ 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_path *path;
- btrfs_set_extent_refs(&extent_item, 1);
- btrfs_set_extent_owner(&extent_item, owner);
+ btrfs_set_stack_extent_refs(&extent_item, 1);
- if (root == extent_root) {
- BUG_ON(extent_root->fs_info->current_insert.offset == 0);
- BUG_ON(num_blocks != 1);
- BUG_ON(extent_root->fs_info->current_insert.flags ==
- extent_root->fs_info->current_insert.offset);
- ins->offset = 1;
- ins->objectid = extent_root->fs_info->current_insert.objectid +
- extent_root->fs_info->current_insert.flags++;
- return 0;
- }
- 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;
- 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);
+
+ 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;
+ }
+
+ 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);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_insert_extent_backref(trans, extent_root, path,
+ ins->objectid, root_objectid,
+ ref_generation, owner, owner_offset);
+
+ BUG_ON(ret);
+ btrfs_free_path(path);
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;
+ }
+
+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 root_objectid, u64 hint,
+ u64 empty_size)
+{
+ u64 ref_generation;
+
+ if (root->ref_cows)
+ ref_generation = trans->transid;
+ else
+ ref_generation = 0;
+
+
+ return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
+ ref_generation, 0, 0, hint, empty_size);
+}
+
+/*
+ * helper function to allocate a block for a given tree
+ * returns the tree buffer or NULL.
+ */
+struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u32 blocksize,
+ u64 root_objectid,
+ u64 ref_generation,
+ u64 first_objectid,
+ int level,
+ u64 hint,
+ u64 empty_size)
{
struct btrfs_key ins;
int ret;
- struct buffer_head *buf;
+ struct extent_buffer *buf;
- ret = alloc_extent(trans, root, 1, 0, (unsigned long)-1,
- btrfs_header_parentid(btrfs_buffer_header(root->node)), &ins);
+ ret = btrfs_alloc_extent(trans, root, blocksize,
+ root_objectid, ref_generation,
+ first_objectid, level, empty_size, hint,
+ (u64)-1, &ins, 0);
if (ret) {
- BUG();
- return NULL;
+ BUG_ON(ret > 0);
+ return ERR_PTR(ret);
}
- buf = find_tree_block(root, ins.objectid);
- dirty_tree_block(trans, root, buf);
+ buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
+ if (!buf) {
+ btrfs_free_extent(trans, root, ins.objectid, blocksize,
+ root->root_key.objectid, ref_generation,
+ 0, 0, 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 extent_buffer *leaf)
+{
+ u64 leaf_owner;
+ u64 leaf_generation;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ int i;
+ int nritems;
+ int ret;
+
+ BUG_ON(!btrfs_is_leaf(leaf));
+ nritems = btrfs_header_nritems(leaf);
+ leaf_owner = btrfs_header_owner(leaf);
+ leaf_generation = btrfs_header_generation(leaf);
+
+ for (i = 0; i < nritems; i++) {
+ 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(leaf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ /*
+ * FIXME make sure to insert a trans record that
+ * repeats the snapshot del on crash
+ */
+ 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),
+ leaf_owner, leaf_generation,
+ key.objectid, key.offset, 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;
+ u64 root_owner;
+ u64 root_gen;
+ u64 bytenr;
+ struct extent_buffer *next;
+ struct extent_buffer *cur;
+ struct extent_buffer *parent;
+ u32 blocksize;
int ret;
u32 refs;
- ret = lookup_block_ref(trans, root, path->nodes[*level]->b_blocknr,
- &refs);
+ WARN_ON(*level < 0);
+ WARN_ON(*level >= BTRFS_MAX_LEVEL);
+ 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
*/
- while(*level > 0) {
+ while(*level >= 0) {
+ WARN_ON(*level < 0);
+ WARN_ON(*level >= BTRFS_MAX_LEVEL);
cur = path->nodes[*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_block_ref(trans, root, blocknr, &refs);
- if (refs != 1 || *level == 1) {
+ }
+ 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) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
- ret = btrfs_free_extent(trans, root, blocknr, 1, 1);
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize, root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
- BUG_ON(ret);
- 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) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
+
+ path->slots[*level]++;
+ free_extent_buffer(next);
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize,
+ root_owner,
+ root_gen, 0, 0, 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:
- ret = btrfs_free_extent(trans, root, path->nodes[*level]->b_blocknr,
- 1, 1);
- btrfs_block_release(root, path->nodes[*level]);
+ WARN_ON(*level < 0);
+ WARN_ON(*level >= BTRFS_MAX_LEVEL);
+
+ if (path->nodes[*level] == root->node) {
+ root_owner = root->root_key.objectid;
+ parent = path->nodes[*level];
+ } else {
+ parent = path->nodes[*level + 1];
+ root_owner = btrfs_header_owner(parent);
+ }
+
+ root_gen = btrfs_header_generation(parent);
+ ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
+ free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
BUG_ON(ret);
static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
+ u64 root_owner;
+ u64 root_gen;
+ struct btrfs_root_item *root_item = &root->root_item;
int i;
int slot;
int ret;
+
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 {
+ if (path->nodes[*level] == root->node) {
+ root_owner = root->root_key.objectid;
+ root_gen =
+ btrfs_header_generation(path->nodes[*level]);
+ } else {
+ struct extent_buffer *node;
+ node = path->nodes[*level + 1];
+ root_owner = btrfs_header_owner(node);
+ root_gen = btrfs_header_generation(node);
+ }
ret = btrfs_free_extent(trans, root,
- path->nodes[*level]->b_blocknr,
- 1, 1);
- btrfs_block_release(root, path->nodes[*level]);
+ path->nodes[*level]->start,
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
+ BUG_ON(ret);
+ free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level = i + 1;
- BUG_ON(ret);
}
}
return 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;
int level;
- struct btrfs_path path;
+ struct btrfs_path *path;
int i;
int orig_level;
+ struct btrfs_root_item *root_item = &root->root_item;
- btrfs_init_path(&path);
+ path = btrfs_alloc_path();
+ BUG_ON(!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);
+ wret = walk_down_tree(trans, root, path, &level);
if (wret > 0)
break;
if (wret < 0)
ret = wret;
- wret = walk_up_tree(trans, root, &path, &level);
+ wret = walk_up_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]);
+ if (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;
+ while(1) {
+ 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;
+ clear_extent_dirty(&info->free_space_cache, start,
+ end, GFP_NOFS);
+ }
+ return 0;
+}
+
+int btrfs_read_block_groups(struct btrfs_root *root)
+{
+ struct btrfs_path *path;
+ int ret;
+ int err = 0;
+ 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 extent_buffer *leaf;
+
+ block_group_cache = &info->block_group_cache;
+
+ root = info->extent_root;
+ key.objectid = 0;
+ key.offset = BTRFS_BLOCK_GROUP_SIZE;
+ btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ while(1) {
+ ret = btrfs_search_slot(NULL, info->extent_root,
+ &key, path, 0, 0);
+ if (ret != 0) {
+ err = ret;
+ break;
+ }
+ 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;
+ }
+
+ 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->cached = 0;
+ cache->pinned = 0;
+ key.objectid = found_key.objectid + found_key.offset;
+ btrfs_release_path(root, path);
+
+ 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_bytes(&info->super_copy))
+ break;
+ }
+
+ btrfs_free_path(path);
+ return 0;
+}
projects / linux-2.6-omap-h63xx.git / blobdiff