diff options
Diffstat (limited to 'fs/btrfs/relocation.c')
| -rw-r--r-- | fs/btrfs/relocation.c | 3711 |
1 files changed, 3711 insertions, 0 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c new file mode 100644 index 00000000000..b23dc209ae1 --- /dev/null +++ b/fs/btrfs/relocation.c @@ -0,0 +1,3711 @@ +/* + * Copyright (C) 2009 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/pagemap.h> +#include <linux/writeback.h> +#include <linux/blkdev.h> +#include <linux/rbtree.h> +#include "ctree.h" +#include "disk-io.h" +#include "transaction.h" +#include "volumes.h" +#include "locking.h" +#include "btrfs_inode.h" +#include "async-thread.h" + +/* + * backref_node, mapping_node and tree_block start with this + */ +struct tree_entry { + struct rb_node rb_node; + u64 bytenr; +}; + +/* + * present a tree block in the backref cache + */ +struct backref_node { + struct rb_node rb_node; + u64 bytenr; + /* objectid tree block owner */ + u64 owner; + /* list of upper level blocks reference this block */ + struct list_head upper; + /* list of child blocks in the cache */ + struct list_head lower; + /* NULL if this node is not tree root */ + struct btrfs_root *root; + /* extent buffer got by COW the block */ + struct extent_buffer *eb; + /* level of tree block */ + unsigned int level:8; + /* 1 if the block is root of old snapshot */ + unsigned int old_root:1; + /* 1 if no child blocks in the cache */ + unsigned int lowest:1; + /* is the extent buffer locked */ + unsigned int locked:1; + /* has the block been processed */ + unsigned int processed:1; + /* have backrefs of this block been checked */ + unsigned int checked:1; +}; + +/* + * present a block pointer in the backref cache + */ +struct backref_edge { + struct list_head list[2]; + struct backref_node *node[2]; + u64 blockptr; +}; + +#define LOWER 0 +#define UPPER 1 + +struct backref_cache { + /* red black tree of all backref nodes in the cache */ + struct rb_root rb_root; + /* list of backref nodes with no child block in the cache */ + struct list_head pending[BTRFS_MAX_LEVEL]; + spinlock_t lock; +}; + +/* + * map address of tree root to tree + */ +struct mapping_node { + struct rb_node rb_node; + u64 bytenr; + void *data; +}; + +struct mapping_tree { + struct rb_root rb_root; + spinlock_t lock; +}; + +/* + * present a tree block to process + */ +struct tree_block { + struct rb_node rb_node; + u64 bytenr; + struct btrfs_key key; + unsigned int level:8; + unsigned int key_ready:1; +}; + +/* inode vector */ +#define INODEVEC_SIZE 16 + +struct inodevec { + struct list_head list; + struct inode *inode[INODEVEC_SIZE]; + int nr; +}; + +struct reloc_control { + /* block group to relocate */ + struct btrfs_block_group_cache *block_group; + /* extent tree */ + struct btrfs_root *extent_root; + /* inode for moving data */ + struct inode *data_inode; + struct btrfs_workers workers; + /* tree blocks have been processed */ + struct extent_io_tree processed_blocks; + /* map start of tree root to corresponding reloc tree */ + struct mapping_tree reloc_root_tree; + /* list of reloc trees */ + struct list_head reloc_roots; + u64 search_start; + u64 extents_found; + u64 extents_skipped; + int stage; + int create_reloc_root; + unsigned int found_file_extent:1; + unsigned int found_old_snapshot:1; +}; + +/* stages of data relocation */ +#define MOVE_DATA_EXTENTS 0 +#define UPDATE_DATA_PTRS 1 + +/* + * merge reloc tree to corresponding fs tree in worker threads + */ +struct async_merge { + struct btrfs_work work; + struct reloc_control *rc; + struct btrfs_root *root; + struct completion *done; + atomic_t *num_pending; +}; + +static void mapping_tree_init(struct mapping_tree *tree) +{ + tree->rb_root.rb_node = NULL; + spin_lock_init(&tree->lock); +} + +static void backref_cache_init(struct backref_cache *cache) +{ + int i; + cache->rb_root.rb_node = NULL; + for (i = 0; i < BTRFS_MAX_LEVEL; i++) + INIT_LIST_HEAD(&cache->pending[i]); + spin_lock_init(&cache->lock); +} + +static void backref_node_init(struct backref_node *node) +{ + memset(node, 0, sizeof(*node)); + INIT_LIST_HEAD(&node->upper); + INIT_LIST_HEAD(&node->lower); + RB_CLEAR_NODE(&node->rb_node); +} + +static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, + struct rb_node *node) +{ + struct rb_node **p = &root->rb_node; + struct rb_node *parent = NULL; + struct tree_entry *entry; + + while (*p) { + parent = *p; + entry = rb_entry(parent, struct tree_entry, rb_node); + + if (bytenr < entry->bytenr) + p = &(*p)->rb_left; + else if (bytenr > entry->bytenr) + p = &(*p)->rb_right; + else + return parent; + } + + rb_link_node(node, parent, p); + rb_insert_color(node, root); + return NULL; +} + +static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) +{ + struct rb_node *n = root->rb_node; + struct tree_entry *entry; + + while (n) { + entry = rb_entry(n, struct tree_entry, rb_node); + + if (bytenr < entry->bytenr) + n = n->rb_left; + else if (bytenr > entry->bytenr) + n = n->rb_right; + else + return n; + } + return NULL; +} + +/* + * walk up backref nodes until reach node presents tree root + */ +static struct backref_node *walk_up_backref(struct backref_node *node, + struct backref_edge *edges[], + int *index) +{ + struct backref_edge *edge; + int idx = *index; + + while (!list_empty(&node->upper)) { + edge = list_entry(node->upper.next, + struct backref_edge, list[LOWER]); + edges[idx++] = edge; + node = edge->node[UPPER]; + } + *index = idx; + return node; +} + +/* + * walk down backref nodes to find start of next reference path + */ +static struct backref_node *walk_down_backref(struct backref_edge *edges[], + int *index) +{ + struct backref_edge *edge; + struct backref_node *lower; + int idx = *index; + + while (idx > 0) { + edge = edges[idx - 1]; + lower = edge->node[LOWER]; + if (list_is_last(&edge->list[LOWER], &lower->upper)) { + idx--; + continue; + } + edge = list_entry(edge->list[LOWER].next, + struct backref_edge, list[LOWER]); + edges[idx - 1] = edge; + *index = idx; + return edge->node[UPPER]; + } + *index = 0; + return NULL; +} + +static void drop_node_buffer(struct backref_node *node) +{ + if (node->eb) { + if (node->locked) { + btrfs_tree_unlock(node->eb); + node->locked = 0; + } + free_extent_buffer(node->eb); + node->eb = NULL; + } +} + +static void drop_backref_node(struct backref_cache *tree, + struct backref_node *node) +{ + BUG_ON(!node->lowest); + BUG_ON(!list_empty(&node->upper)); + + drop_node_buffer(node); + list_del(&node->lower); + + rb_erase(&node->rb_node, &tree->rb_root); + kfree(node); +} + +/* + * remove a backref node from the backref cache + */ +static void remove_backref_node(struct backref_cache *cache, + struct backref_node *node) +{ + struct backref_node *upper; + struct backref_edge *edge; + + if (!node) + return; + + BUG_ON(!node->lowest); + while (!list_empty(&node->upper)) { + edge = list_entry(node->upper.next, struct backref_edge, + list[LOWER]); + upper = edge->node[UPPER]; + list_del(&edge->list[LOWER]); + list_del(&edge->list[UPPER]); + kfree(edge); + /* + * add the node to pending list if no other + * child block cached. + */ + if (list_empty(&upper->lower)) { + list_add_tail(&upper->lower, + &cache->pending[upper->level]); + upper->lowest = 1; + } + } + drop_backref_node(cache, node); +} + +/* + * find reloc tree by address of tree root + */ +static struct btrfs_root *find_reloc_root(struct reloc_control *rc, + u64 bytenr) +{ + struct rb_node *rb_node; + struct mapping_node *node; + struct btrfs_root *root = NULL; + + spin_lock(&rc->reloc_root_tree.lock); + rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr); + if (rb_node) { + node = rb_entry(rb_node, struct mapping_node, rb_node); + root = (struct btrfs_root *)node->data; + } + spin_unlock(&rc->reloc_root_tree.lock); + return root; +} + +static int is_cowonly_root(u64 root_objectid) +{ + if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || + root_objectid == BTRFS_EXTENT_TREE_OBJECTID || + root_objectid == BTRFS_CHUNK_TREE_OBJECTID || + root_objectid == BTRFS_DEV_TREE_OBJECTID || + root_objectid == BTRFS_TREE_LOG_OBJECTID || + root_objectid == BTRFS_CSUM_TREE_OBJECTID) + return 1; + return 0; +} + +static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, + u64 root_objectid) +{ + struct btrfs_key key; + + key.objectid = root_objectid; + key.type = BTRFS_ROOT_ITEM_KEY; + if (is_cowonly_root(root_objectid)) + key.offset = 0; + else + key.offset = (u64)-1; + + return btrfs_read_fs_root_no_name(fs_info, &key); +} + +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 +static noinline_for_stack +struct btrfs_root *find_tree_root(struct reloc_control *rc, + struct extent_buffer *leaf, + struct btrfs_extent_ref_v0 *ref0) +{ + struct btrfs_root *root; + u64 root_objectid = btrfs_ref_root_v0(leaf, ref0); + u64 generation = btrfs_ref_generation_v0(leaf, ref0); + + BUG_ON(root_objectid == BTRFS_TREE_RELOC_OBJECTID); + + root = read_fs_root(rc->extent_root->fs_info, root_objectid); + BUG_ON(IS_ERR(root)); + + if (root->ref_cows && + generation != btrfs_root_generation(&root->root_item)) + return NULL; + + return root; +} +#endif + +static noinline_for_stack +int find_inline_backref(struct extent_buffer *leaf, int slot, + unsigned long *ptr, unsigned long *end) +{ + struct btrfs_extent_item *ei; + struct btrfs_tree_block_info *bi; + u32 item_size; + + item_size = btrfs_item_size_nr(leaf, slot); +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + if (item_size < sizeof(*ei)) { + WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); + return 1; + } +#endif + ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); + WARN_ON(!(btrfs_extent_flags(leaf, ei) & + BTRFS_EXTENT_FLAG_TREE_BLOCK)); + + if (item_size <= sizeof(*ei) + sizeof(*bi)) { + WARN_ON(item_size < sizeof(*ei) + sizeof(*bi)); + return 1; + } + + bi = (struct btrfs_tree_block_info *)(ei + 1); + *ptr = (unsigned long)(bi + 1); + *end = (unsigned long)ei + item_size; + return 0; +} + +/* + * build backref tree for a given tree block. root of the backref tree + * corresponds the tree block, leaves of the backref tree correspond + * roots of b-trees that reference the tree block. + * + * the basic idea of this function is check backrefs of a given block + * to find upper level blocks that refernece the block, and then check + * bakcrefs of these upper level blocks recursively. the recursion stop + * when tree root is reached or backrefs for the block is cached. + * + * NOTE: if we find backrefs for a block are cached, we know backrefs + * for all upper level blocks that directly/indirectly reference the + * block are also cached. + */ +static struct backref_node *build_backref_tree(struct reloc_control *rc, + struct backref_cache *cache, + struct btrfs_key *node_key, + int level, u64 bytenr) +{ + struct btrfs_path *path1; + struct btrfs_path *path2; + struct extent_buffer *eb; + struct btrfs_root *root; + struct backref_node *cur; + struct backref_node *upper; + struct backref_node *lower; + struct backref_node *node = NULL; + struct backref_node *exist = NULL; + struct backref_edge *edge; + struct rb_node *rb_node; + struct btrfs_key key; + unsigned long end; + unsigned long ptr; + LIST_HEAD(list); + int ret; + int err = 0; + + path1 = btrfs_alloc_path(); + path2 = btrfs_alloc_path(); + if (!path1 || !path2) { + err = -ENOMEM; + goto out; + } + + node = kmalloc(sizeof(*node), GFP_NOFS); + if (!node) { + err = -ENOMEM; + goto out; + } + + backref_node_init(node); + node->bytenr = bytenr; + node->owner = 0; + node->level = level; + node->lowest = 1; + cur = node; +again: + end = 0; + ptr = 0; + key.objectid = cur->bytenr; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = (u64)-1; + + path1->search_commit_root = 1; + path1->skip_locking = 1; + ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1, + 0, 0); + if (ret < 0) { + err = ret; + goto out; + } + BUG_ON(!ret || !path1->slots[0]); + + path1->slots[0]--; + + WARN_ON(cur->checked); + if (!list_empty(&cur->upper)) { + /* + * the backref was added previously when processsing + * backref of type BTRFS_TREE_BLOCK_REF_KEY + */ + BUG_ON(!list_is_singular(&cur->upper)); + edge = list_entry(cur->upper.next, struct backref_edge, + list[LOWER]); + BUG_ON(!list_empty(&edge->list[UPPER])); + exist = edge->node[UPPER]; + /* + * add the upper level block to pending list if we need + * check its backrefs + */ + if (!exist->checked) + list_add_tail(&edge->list[UPPER], &list); + } else { + exist = NULL; + } + + while (1) { + cond_resched(); + eb = path1->nodes[0]; + + if (ptr >= end) { + if (path1->slots[0] >= btrfs_header_nritems(eb)) { + ret = btrfs_next_leaf(rc->extent_root, path1); + if (ret < 0) { + err = ret; + goto out; + } + if (ret > 0) + break; + eb = path1->nodes[0]; + } + + btrfs_item_key_to_cpu(eb, &key, path1->slots[0]); + if (key.objectid != cur->bytenr) { + WARN_ON(exist); + break; + } + + if (key.type == BTRFS_EXTENT_ITEM_KEY) { + ret = find_inline_backref(eb, path1->slots[0], + &ptr, &end); + if (ret) + goto next; + } + } + + if (ptr < end) { + /* update key for inline back ref */ + struct btrfs_extent_inline_ref *iref; + iref = (struct btrfs_extent_inline_ref *)ptr; + key.type = btrfs_extent_inline_ref_type(eb, iref); + key.offset = btrfs_extent_inline_ref_offset(eb, iref); + WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY && + key.type != BTRFS_SHARED_BLOCK_REF_KEY); + } + + if (exist && + ((key.type == BTRFS_TREE_BLOCK_REF_KEY && + exist->owner == key.offset) || + (key.type == BTRFS_SHARED_BLOCK_REF_KEY && + exist->bytenr == key.offset))) { + exist = NULL; + goto next; + } + +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + if (key.type == BTRFS_SHARED_BLOCK_REF_KEY || + key.type == BTRFS_EXTENT_REF_V0_KEY) { + if (key.objectid == key.offset && + key.type == BTRFS_EXTENT_REF_V0_KEY) { + struct btrfs_extent_ref_v0 *ref0; + ref0 = btrfs_item_ptr(eb, path1->slots[0], + struct btrfs_extent_ref_v0); + root = find_tree_root(rc, eb, ref0); + if (root) + cur->root = root; + else + cur->old_root = 1; + break; + } +#else + BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); + if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { +#endif + if (key.objectid == key.offset) { + /* + * only root blocks of reloc trees use + * backref of this type. + */ + root = find_reloc_root(rc, cur->bytenr); + BUG_ON(!root); + cur->root = root; + break; + } + + edge = kzalloc(sizeof(*edge), GFP_NOFS); + if (!edge) { + err = -ENOMEM; + goto out; + } + rb_node = tree_search(&cache->rb_root, key.offset); + if (!rb_node) { + upper = kmalloc(sizeof(*upper), GFP_NOFS); + if (!upper) { + kfree(edge); + err = -ENOMEM; + goto out; + } + backref_node_init(upper); + upper->bytenr = key.offset; + upper->owner = 0; + upper->level = cur->level + 1; + /* + * backrefs for the upper level block isn't + * cached, add the block to pending list + */ + list_add_tail(&edge->list[UPPER], &list); + } else { + upper = rb_entry(rb_node, struct backref_node, + rb_node); + INIT_LIST_HEAD(&edge->list[UPPER]); + } + list_add(&edge->list[LOWER], &cur->upper); + edge->node[UPPER] = upper; + edge->node[LOWER] = cur; + + goto next; + } else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) { + goto next; + } + + /* key.type == BTRFS_TREE_BLOCK_REF_KEY */ + root = read_fs_root(rc->extent_root->fs_info, key.offset); + if (IS_ERR(root)) { + err = PTR_ERR(root); + goto out; + } + + if (btrfs_root_level(&root->root_item) == cur->level) { + /* tree root */ + BUG_ON(btrfs_root_bytenr(&root->root_item) != + cur->bytenr); + cur->root = root; + break; + } + + level = cur->level + 1; + + /* + * searching the tree to find upper level blocks + * reference the block. + */ + path2->search_commit_root = 1; + path2->skip_locking = 1; + path2->lowest_level = level; + ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0); + path2->lowest_level = 0; + if (ret < 0) { + err = ret; + goto out; + } + + eb = path2->nodes[level]; + WARN_ON(btrfs_node_blockptr(eb, path2->slots[level]) != + cur->bytenr); + + lower = cur; + for (; level < BTRFS_MAX_LEVEL; level++) { + if (!path2->nodes[level]) { + BUG_ON(btrfs_root_bytenr(&root->root_item) != + lower->bytenr); + lower->root = root; + break; + } + + edge = kzalloc(sizeof(*edge), GFP_NOFS); + if (!edge) { + err = -ENOMEM; + goto out; + } + + eb = path2->nodes[level]; + rb_node = tree_search(&cache->rb_root, eb->start); + if (!rb_node) { + upper = kmalloc(sizeof(*upper), GFP_NOFS); + if (!upper) { + kfree(edge); + err = -ENOMEM; + goto out; + } + backref_node_init(upper); + upper->bytenr = eb->start; + upper->owner = btrfs_header_owner(eb); + upper->level = lower->level + 1; + + /* + * if we know the block isn't shared + * we can void checking its backrefs. + */ + if (btrfs_block_can_be_shared(root, eb)) + upper->checked = 0; + else + upper->checked = 1; + + /* + * add the block to pending list if we + * need check its backrefs. only block + * at 'cur->level + 1' is added to the + * tail of pending list. this guarantees + * we check backrefs from lower level + * blocks to upper level blocks. + */ + if (!upper->checked && + level == cur->level + 1) { + list_add_tail(&edge->list[UPPER], + &list); + } else + INIT_LIST_HEAD(&edge->list[UPPER]); + } else { + upper = rb_entry(rb_node, struct backref_node, + rb_node); + BUG_ON(!upper->checked); + INIT_LIST_HEAD(&edge->list[UPPER]); + } + list_add_tail(&edge->list[LOWER], &lower->upper); + edge->node[UPPER] = upper; + edge->node[LOWER] = lower; + + if (rb_node) + break; + lower = upper; + upper = NULL; + } + btrfs_release_path(root, path2); +next: + if (ptr < end) { + ptr += btrfs_extent_inline_ref_size(key.type); + if (ptr >= end) { + WARN_ON(ptr > end); + ptr = 0; + end = 0; + } + } + if (ptr >= end) + path1->slots[0]++; + } + btrfs_release_path(rc->extent_root, path1); + + cur->checked = 1; + WARN_ON(exist); + + /* the pending list isn't empty, take the first block to process */ + if (!list_empty(&list)) { + edge = list_entry(list.next, struct backref_edge, list[UPPER]); + list_del_init(&edge->list[UPPER]); + cur = edge->node[UPPER]; + goto again; + } + + /* + * everything goes well, connect backref nodes and insert backref nodes + * into the cache. + */ + BUG_ON(!node->checked); + rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node); + BUG_ON(rb_node); + + list_for_each_entry(edge, &node->upper, list[LOWER]) + list_add_tail(&edge->list[UPPER], &list); + + while (!list_empty(&list)) { + edge = list_entry(list.next, struct backref_edge, list[UPPER]); + list_del_init(&edge->list[UPPER]); + upper = edge->node[UPPER]; + + if (!RB_EMPTY_NODE(&upper->rb_node)) { + if (upper->lowest) { + list_del_init(&upper->lower); + upper->lowest = 0; + } + + list_add_tail(&edge->list[UPPER], &upper->lower); + continue; + } + + BUG_ON(!upper->checked); + rb_node = tree_insert(&cache->rb_root, upper->bytenr, + &upper->rb_node); + BUG_ON(rb_node); + + list_add_tail(&edge->list[UPPER], &upper->lower); + + list_for_each_entry(edge, &upper->upper, list[LOWER]) + list_add_tail(&edge->list[UPPER], &list); + } +out: + btrfs_free_path(path1); + btrfs_free_path(path2); + if (err) { + INIT_LIST_HEAD(&list); + upper = node; + while (upper) { + if (RB_EMPTY_NODE(&upper->rb_node)) { + list_splice_tail(&upper->upper, &list); + kfree(upper); + } + + if (list_empty(&list)) + break; + + edge = list_entry(list.next, struct backref_edge, + list[LOWER]); + upper = edge->node[UPPER]; + kfree(edge); + } + return ERR_PTR(err); + } + return node; +} + +/* + * helper to add 'address of tree root -> reloc tree' mapping + */ +static int __add_reloc_root(struct btrfs_root *root) +{ + struct rb_node *rb_node; + struct mapping_node *node; + struct reloc_control *rc = root->fs_info->reloc_ctl; + + node = kmalloc(sizeof(*node), GFP_NOFS); + BUG_ON(!node); + + node->bytenr = root->node->start; + node->data = root; + + spin_lock(&rc->reloc_root_tree.lock); + rb_node = tree_insert(&rc->reloc_root_tree.rb_root, + node->bytenr, &node->rb_node); + spin_unlock(&rc->reloc_root_tree.lock); + BUG_ON(rb_node); + + list_add_tail(&root->root_list, &rc->reloc_roots); + return 0; +} + +/* + * helper to update/delete the 'address of tree root -> reloc tree' + * mapping + */ +static int __update_reloc_root(struct btrfs_root *root, int del) +{ + struct rb_node *rb_node; + struct mapping_node *node = NULL; + struct reloc_control *rc = root->fs_info->reloc_ctl; + + spin_lock(&rc->reloc_root_tree.lock); + rb_node = tree_search(&rc->reloc_root_tree.rb_root, + root->commit_root->start); + if (rb_node) { + node = rb_entry(rb_node, struct mapping_node, rb_node); + rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); + } + spin_unlock(&rc->reloc_root_tree.lock); + + BUG_ON((struct btrfs_root *)node->data != root); + + if (!del) { + spin_lock(&rc->reloc_root_tree.lock); + node->bytenr = root->node->start; + rb_node = tree_insert(&rc->reloc_root_tree.rb_root, + node->bytenr, &node->rb_node); + spin_unlock(&rc->reloc_root_tree.lock); + BUG_ON(rb_node); + } else { + list_del_init(&root->root_list); + kfree(node); + } + return 0; +} + +/* + * create reloc tree for a given fs tree. reloc tree is just a + * snapshot of the fs tree with special root objectid. + */ +int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_root *reloc_root; + struct extent_buffer *eb; + struct btrfs_root_item *root_item; + struct btrfs_key root_key; + int ret; + + if (root->reloc_root) { + reloc_root = root->reloc_root; + reloc_root->last_trans = trans->transid; + return 0; + } + + if (!root->fs_info->reloc_ctl || + !root->fs_info->reloc_ctl->create_reloc_root || + root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) + return 0; + + root_item = kmalloc(sizeof(*root_item), GFP_NOFS); + BUG_ON(!root_item); + + root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; + root_key.type = BTRFS_ROOT_ITEM_KEY; + root_key.offset = root->root_key.objectid; + + ret = btrfs_copy_root(trans, root, root->commit_root, &eb, + BTRFS_TREE_RELOC_OBJECTID); + BUG_ON(ret); + + btrfs_set_root_last_snapshot(&root->root_item, trans->transid - 1); + memcpy(root_item, &root->root_item, sizeof(*root_item)); + btrfs_set_root_refs(root_item, 1); + btrfs_set_root_bytenr(root_item, eb->start); + btrfs_set_root_level(root_item, btrfs_header_level(eb)); + btrfs_set_root_generation(root_item, trans->transid); + memset(&root_item->drop_progress, 0, sizeof(struct btrfs_disk_key)); + root_item->drop_level = 0; + + btrfs_tree_unlock(eb); + free_extent_buffer(eb); + + ret = btrfs_insert_root(trans, root->fs_info->tree_root, + &root_key, root_item); + BUG_ON(ret); + kfree(root_item); + + reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, + &root_key); + BUG_ON(IS_ERR(reloc_root)); + reloc_root->last_trans = trans->transid; + + __add_reloc_root(reloc_root); + root->reloc_root = reloc_root; + return 0; +} + +/* + * update root item of reloc tree + */ +int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_root *reloc_root; + struct btrfs_root_item *root_item; + int del = 0; + int ret; + + if (!root->reloc_root) + return 0; + + reloc_root = root->reloc_root; + root_item = &reloc_root->root_item; + + if (btrfs_root_refs(root_item) == 0) { + root->reloc_root = NULL; + del = 1; + } + + __update_reloc_root(reloc_root, del); + + if (reloc_root->commit_root != reloc_root->node) { + btrfs_set_root_node(root_item, reloc_root->node); + free_extent_buffer(reloc_root->commit_root); + reloc_root->commit_root = btrfs_root_node(reloc_root); + } + + ret = btrfs_update_root(trans, root->fs_info->tree_root, + &reloc_root->root_key, root_item); + BUG_ON(ret); + return 0; +} + +/* + * helper to find first cached inode with inode number >= objectid + * in a subvolume + */ +static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) +{ + struct rb_node *node; + struct rb_node *prev; + struct btrfs_inode *entry; + struct inode *inode; + + spin_lock(&root->inode_lock); +again: + node = root->inode_tree.rb_node; + prev = NULL; + while (node) { + prev = node; + entry = rb_entry(node, struct btrfs_inode, rb_node); + + if (objectid < entry->vfs_inode.i_ino) + node = node->rb_left; + else if (objectid > entry->vfs_inode.i_ino) + node = node->rb_right; + else + break; + } + if (!node) { + while (prev) { + entry = rb_entry(prev, struct btrfs_inode, rb_node); + if (objectid <= entry->vfs_inode.i_ino) { + node = prev; + break; + } + prev = rb_next(prev); + } + } + while (node) { + entry = rb_entry(node, struct btrfs_inode, rb_node); + inode = igrab(&entry->vfs_inode); + if (inode) { + spin_unlock(&root->inode_lock); + return inode; + } + + objectid = entry->vfs_inode.i_ino + 1; + if (cond_resched_lock(&root->inode_lock)) + goto again; + + node = rb_next(node); + } + spin_unlock(&root->inode_lock); + return NULL; +} + +static int in_block_group(u64 bytenr, + struct btrfs_block_group_cache *block_group) +{ + if (bytenr >= block_group->key.objectid && + bytenr < block_group->key.objectid + block_group->key.offset) + return 1; + return 0; +} + +/* + * get new location of data + */ +static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, + u64 bytenr, u64 num_bytes) +{ + struct btrfs_root *root = BTRFS_I(reloc_inode)->root; + struct btrfs_path *path; + struct btrfs_file_extent_item *fi; + struct extent_buffer *leaf; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + bytenr -= BTRFS_I(reloc_inode)->index_cnt; + ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, + bytenr, 0); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + leaf = path->nodes[0]; + fi = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + + BUG_ON(btrfs_file_extent_offset(leaf, fi) || + btrfs_file_extent_compression(leaf, fi) || + btrfs_file_extent_encryption(leaf, fi) || + btrfs_file_extent_other_encoding(leaf, fi)); + + if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { + ret = 1; + goto out; + } + + if (new_bytenr) + *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); + ret = 0; +out: + btrfs_free_path(path); + return ret; +} + +/* + * update file extent items in the tree leaf to point to + * the new locations. + */ +static int replace_file_extents(struct btrfs_trans_handle *trans, + struct reloc_control *rc, + struct btrfs_root *root, + struct extent_buffer *leaf, + struct list_head *inode_list) +{ + struct btrfs_key key; + struct btrfs_file_extent_item *fi; + struct inode *inode = NULL; + struct inodevec *ivec = NULL; + u64 parent; + u64 bytenr; + u64 new_bytenr; + u64 num_bytes; + u64 end; + u32 nritems; + u32 i; + int ret; + int first = 1; + int dirty = 0; + + if (rc->stage != UPDATE_DATA_PTRS) + return 0; + + /* reloc trees always use full backref */ + if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) + parent = leaf->start; + else + parent = 0; + + nritems = btrfs_header_nritems(leaf); + for (i = 0; i < nritems; i++) { + cond_resched(); + btrfs_item_key_to_cpu(leaf, &key, i); + if (key.type != 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; + bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); + num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); + if (bytenr == 0) + continue; + if (!in_block_group(bytenr, rc->block_group)) + continue; + + /* + * if we are modifying block in fs tree, wait for readpage + * to complete and drop the extent cache + */ + if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { + if (!ivec || ivec->nr == INODEVEC_SIZE) { + ivec = kmalloc(sizeof(*ivec), GFP_NOFS); + BUG_ON(!ivec); + ivec->nr = 0; + list_add_tail(&ivec->list, inode_list); + } + if (first) { + inode = find_next_inode(root, key.objectid); + if (inode) + ivec->inode[ivec->nr++] = inode; + first = 0; + } else if (inode && inode->i_ino < key.objectid) { + inode = find_next_inode(root, key.objectid); + if (inode) + ivec->inode[ivec->nr++] = inode; + } + if (inode && inode->i_ino == key.objectid) { + end = key.offset + + btrfs_file_extent_num_bytes(leaf, fi); + WARN_ON(!IS_ALIGNED(key.offset, + root->sectorsize)); + WARN_ON(!IS_ALIGNED(end, root->sectorsize)); + end--; + ret = try_lock_extent(&BTRFS_I(inode)->io_tree, + key.offset, end, + GFP_NOFS); + if (!ret) + continue; + + btrfs_drop_extent_cache(inode, key.offset, end, + 1); + unlock_extent(&BTRFS_I(inode)->io_tree, + key.offset, end, GFP_NOFS); + } + } + + ret = get_new_location(rc->data_inode, &new_bytenr, + bytenr, num_bytes); + if (ret > 0) + continue; + BUG_ON(ret < 0); + + btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); + dirty = 1; + + key.offset -= btrfs_file_extent_offset(leaf, fi); + ret = btrfs_inc_extent_ref(trans, root, new_bytenr, + num_bytes, parent, + btrfs_header_owner(leaf), + key.objectid, key.offset); + BUG_ON(ret); + + ret = btrfs_free_extent(trans, root, bytenr, num_bytes, + parent, btrfs_header_owner(leaf), + key.objectid, key.offset); + BUG_ON(ret); + } + if (dirty) + btrfs_mark_buffer_dirty(leaf); + return 0; +} + +static noinline_for_stack +int memcmp_node_keys(struct extent_buffer *eb, int slot, + struct btrfs_path *path, int level) +{ + struct btrfs_disk_key key1; + struct btrfs_disk_key key2; + btrfs_node_key(eb, &key1, slot); + btrfs_node_key(path->nodes[level], &key2, path->slots[level]); + return memcmp(&key1, &key2, sizeof(key1)); +} + +/* + * try to replace tree blocks in fs tree with the new blocks + * in reloc tree. tree blocks haven't been modified since the + * reloc tree was create can be replaced. + * + * if a block was replaced, level of the block + 1 is returned. + * if no block got replaced, 0 is returned. if there are other + * errors, a negative error number is returned. + */ +static int replace_path(struct btrfs_trans_handle *trans, + struct btrfs_root *dest, struct btrfs_root *src, + struct btrfs_path *path, struct btrfs_key *next_key, + struct extent_buffer **leaf, + int lowest_level, int max_level) +{ + struct extent_buffer *eb; + struct extent_buffer *parent; + struct btrfs_key key; + u64 old_bytenr; + u64 new_bytenr; + u64 old_ptr_gen; + u64 new_ptr_gen; + u64 last_snapshot; + u32 blocksize; + int level; + int ret; + int slot; + + BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); + BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); + BUG_ON(lowest_level > 1 && leaf); + + last_snapshot = btrfs_root_last_snapshot(&src->root_item); + + slot = path->slots[lowest_level]; + btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); + + eb = btrfs_lock_root_node(dest); + btrfs_set_lock_blocking(eb); + level = btrfs_header_level(eb); + + if (level < lowest_level) { + btrfs_tree_unlock(eb); + free_extent_buffer(eb); + return 0; + } + + ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); + BUG_ON(ret); + btrfs_set_lock_blocking(eb); + + if (next_key) { + next_key->objectid = (u64)-1; + next_key->type = (u8)-1; + next_key->offset = (u64)-1; + } + + parent = eb; + while (1) { + level = btrfs_header_level(parent); + BUG_ON(level < lowest_level); + + ret = btrfs_bin_search(parent, &key, level, &slot); + if (ret && slot > 0) + slot--; + + if (next_key && slot + 1 < btrfs_header_nritems(parent)) + btrfs_node_key_to_cpu(parent, next_key, slot + 1); + + old_bytenr = btrfs_node_blockptr(parent, slot); + blocksize = btrfs_level_size(dest, level - 1); + old_ptr_gen = btrfs_node_ptr_generation(parent, slot); + + if (level <= max_level) { + eb = path->nodes[level]; + new_bytenr = btrfs_node_blockptr(eb, + path->slots[level]); + new_ptr_gen = btrfs_node_ptr_generation(eb, + path->slots[level]); + } else { + new_bytenr = 0; + new_ptr_gen = 0; + } + + if (new_bytenr > 0 && new_bytenr == old_bytenr) { + WARN_ON(1); + ret = level; + break; + } + + if (new_bytenr == 0 || old_ptr_gen > last_snapshot || + memcmp_node_keys(parent, slot, path, level)) { + if (level <= lowest_level && !leaf) { + ret = 0; + break; + } + + eb = read_tree_block(dest, old_bytenr, blocksize, + old_ptr_gen); + btrfs_tree_lock(eb); + ret = btrfs_cow_block(trans, dest, eb, parent, + slot, &eb); + BUG_ON(ret); + btrfs_set_lock_blocking(eb); + + if (level <= lowest_level) { + *leaf = eb; + ret = 0; + break; + } + + btrfs_tree_unlock(parent); + free_extent_buffer(parent); + + parent = eb; + continue; + } + + btrfs_node_key_to_cpu(path->nodes[level], &key, + path->slots[level]); + btrfs_release_path(src, path); + + path->lowest_level = level; + ret = btrfs_search_slot(trans, src, &key, path, 0, 1); + path->lowest_level = 0; + BUG_ON(ret); + + /* + * swap blocks in fs tree and reloc tree. + */ + btrfs_set_node_blockptr(parent, slot, new_bytenr); + btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); + btrfs_mark_buffer_dirty(parent); + + btrfs_set_node_blockptr(path->nodes[level], + path->slots[level], old_bytenr); + btrfs_set_node_ptr_generation(path->nodes[level], + path->slots[level], old_ptr_gen); + btrfs_mark_buffer_dirty(path->nodes[level]); + + ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize, + path->nodes[level]->start, + src->root_key.objectid, level - 1, 0); + BUG_ON(ret); + ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize, + 0, dest->root_key.objectid, level - 1, + 0); + BUG_ON(ret); + + ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, + path->nodes[level]->start, + src->root_key.objectid, level - 1, 0); + BUG_ON(ret); + + ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, + 0, dest->root_key.objectid, level - 1, + 0); + BUG_ON(ret); + + btrfs_unlock_up_safe(path, 0); + + ret = level; + break; + } + btrfs_tree_unlock(parent); + free_extent_buffer(parent); + return ret; +} + +/* + * helper to find next relocated block in reloc tree + */ +static noinline_for_stack +int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, + int *level) +{ + struct extent_buffer *eb; + int i; + u64 last_snapshot; + u32 nritems; + + last_snapshot = btrfs_root_last_snapshot(&root->root_item); + + for (i = 0; i < *level; i++) { + free_extent_buffer(path->nodes[i]); + path->nodes[i] = NULL; + } + + for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { + eb = path->nodes[i]; + nritems = btrfs_header_nritems(eb); + while (path->slots[i] + 1 < nritems) { + path->slots[i]++; + if (btrfs_node_ptr_generation(eb, path->slots[i]) <= + last_snapshot) + continue; + + *level = i; + return 0; + } + free_extent_buffer(path->nodes[i]); + path->nodes[i] = NULL; + } + return 1; +} + +/* + * walk down reloc tree to find relocated block of lowest level + */ +static noinline_for_stack +int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, + int *level) +{ + struct extent_buffer *eb = NULL; + int i; + u64 bytenr; + u64 ptr_gen = 0; + u64 last_snapshot; + u32 blocksize; + u32 nritems; + + last_snapshot = btrfs_root_last_snapshot(&root->root_item); + + for (i = *level; i > 0; i--) { + eb = path->nodes[i]; + nritems = btrfs_header_nritems(eb); + while (path->slots[i] < nritems) { + ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); + if (ptr_gen > last_snapshot) + break; + path->slots[i]++; + } + if (path->slots[i] >= nritems) { + if (i == *level) + break; + *level = i + 1; + return 0; + } + if (i == 1) { + *level = i; + return 0; + } + + bytenr = btrfs_node_blockptr(eb, path->slots[i]); + blocksize = btrfs_level_size(root, i - 1); + eb = read_tree_block(root, bytenr, blocksize, ptr_gen); + BUG_ON(btrfs_header_level(eb) != i - 1); + path->nodes[i - 1] = eb; + path->slots[i - 1] = 0; + } + return 1; +} + +/* + * invalidate extent cache for file extents whose key in range of + * [min_key, max_key) + */ +static int invalidate_extent_cache(struct btrfs_root *root, + struct btrfs_key *min_key, + struct btrfs_key *max_key) +{ + struct inode *inode = NULL; + u64 objectid; + u64 start, end; + + objectid = min_key->objectid; + while (1) { + cond_resched(); + iput(inode); + + if (objectid > max_key->objectid) + break; + + inode = find_next_inode(root, objectid); + if (!inode) + break; + + if (inode->i_ino > max_key->objectid) { + iput(inode); + break; + } + + objectid = inode->i_ino + 1; + if (!S_ISREG(inode->i_mode)) + continue; + + if (unlikely(min_key->objectid == inode->i_ino)) { + if (min_key->type > BTRFS_EXTENT_DATA_KEY) + continue; + if (min_key->type < BTRFS_EXTENT_DATA_KEY) + start = 0; + else { + start = min_key->offset; + WARN_ON(!IS_ALIGNED(start, root->sectorsize)); + } + } else { + start = 0; + } + + if (unlikely(max_key->objectid == inode->i_ino)) { + if (max_key->type < BTRFS_EXTENT_DATA_KEY) + continue; + if (max_key->type > BTRFS_EXTENT_DATA_KEY) { + end = (u64)-1; + } else { + if (max_key->offset == 0) + continue; + end = max_key->offset; + WARN_ON(!IS_ALIGNED(end, root->sectorsize)); + end--; + } + } else { + end = (u64)-1; + } + + /* the lock_extent waits for readpage to complete */ + lock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS); + btrfs_drop_extent_cache(inode, start, end, 1); + unlock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS); + } + return 0; +} + +static int find_next_key(struct btrfs_path *path, int level, + struct btrfs_key *key) + +{ + while (level < BTRFS_MAX_LEVEL) { + if (!path->nodes[level]) + break; + if (path->slots[level] + 1 < + btrfs_header_nritems(path->nodes[level])) { + btrfs_node_key_to_cpu(path->nodes[level], key, + path->slots[level] + 1); + return 0; + } + level++; + } + return 1; +} + +/* + * merge the relocated tree blocks in reloc tree with corresponding + * fs tree. + */ +static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, + struct btrfs_root *root) +{ + LIST_HEAD(inode_list); + struct btrfs_key key; + struct btrfs_key next_key; + struct btrfs_trans_handle *trans; + struct btrfs_root *reloc_root; + struct btrfs_root_item *root_item; + struct btrfs_path *path; + struct extent_buffer *leaf = NULL; + unsigned long nr; + int level; + int max_level; + int replaced = 0; + int ret; + int err = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + reloc_root = root->reloc_root; + root_item = &reloc_root->root_item; + + if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { + level = btrfs_root_level(root_item); + extent_buffer_get(reloc_root->node); + path->nodes[level] = reloc_root->node; + path->slots[level] = 0; + } else { + btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); + + level = root_item->drop_level; + BUG_ON(level == 0); + path->lowest_level = level; + ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); + if (ret < 0) { + btrfs_free_path(path); + return ret; + } + + btrfs_node_key_to_cpu(path->nodes[level], &next_key, + path->slots[level]); + WARN_ON(memcmp(&key, &next_key, sizeof(key))); + + btrfs_unlock_up_safe(path, 0); + } + + if (level == 0 && rc->stage == UPDATE_DATA_PTRS) { + trans = btrfs_start_transaction(root, 1); + + leaf = path->nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, 0); + btrfs_release_path(reloc_root, path); + + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); + if (ret < 0) { + err = ret; + goto out; + } + + leaf = path->nodes[0]; + btrfs_unlock_up_safe(path, 1); + ret = replace_file_extents(trans, rc, root, leaf, + &inode_list); + if (ret < 0) + err = ret; + goto out; + } + + memset(&next_key, 0, sizeof(next_key)); + + while (1) { + leaf = NULL; + replaced = 0; + trans = btrfs_start_transaction(root, 1); + max_level = level; + + ret = walk_down_reloc_tree(reloc_root, path, &level); + if (ret < 0) { + err = ret; + goto out; + } + if (ret > 0) + break; + + if (!find_next_key(path, level, &key) && + btrfs_comp_cpu_keys(&next_key, &key) >= 0) { + ret = 0; + } else if (level == 1 && rc->stage == UPDATE_DATA_PTRS) { + ret = replace_path(trans, root, reloc_root, + path, &next_key, &leaf, + level, max_level); + } else { + ret = replace_path(trans, root, reloc_root, + path, &next_key, NULL, + level, max_level); + } + if (ret < 0) { + err = ret; + goto out; + } + + if (ret > 0) { + level = ret; + btrfs_node_key_to_cpu(path->nodes[level], &key, + path->slots[level]); + replaced = 1; + } else if (leaf) { + /* + * no block got replaced, try replacing file extents + */ + btrfs_item_key_to_cpu(leaf, &key, 0); + ret = replace_file_extents(trans, rc, root, leaf, + &inode_list); + btrfs_tree_unlock(leaf); + free_extent_buffer(leaf); + BUG_ON(ret < 0); + } + + ret = walk_up_reloc_tree(reloc_root, path, &level); + if (ret > 0) + break; + + BUG_ON(level == 0); + /* + * save the merging progress in the drop_progress. + * this is OK since root refs == 1 in this case. + */ + btrfs_node_key(path->nodes[level], &root_item->drop_progress, + path->slots[level]); + root_item->drop_level = level; + + nr = trans->blocks_used; + btrfs_end_transaction(trans, root); + + btrfs_btree_balance_dirty(root, nr); + + if (replaced && rc->stage == UPDATE_DATA_PTRS) + invalidate_extent_cache(root, &key, &next_key); + } + + /* + * handle the case only one block in the fs tree need to be + * relocated and the block is tree root. + */ + leaf = btrfs_lock_root_node(root); + ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); + btrfs_tree_unlock(leaf); + free_extent_buffer(leaf); + if (ret < 0) + err = ret; +out: + btrfs_free_path(path); + + if (err == 0) { + memset(&root_item->drop_progress, 0, + sizeof(root_item->drop_progress)); + root_item->drop_level = 0; + btrfs_set_root_refs(root_item, 0); + } + + nr = trans->blocks_used; + btrfs_end_transaction(trans, root); + + btrfs_btree_balance_dirty(root, nr); + + /* + * put inodes while we aren't holding the tree locks + */ + while (!list_empty(&inode_list)) { + struct inodevec *ivec; + ivec = list_entry(inode_list.next, struct inodevec, list); + list_del(&ivec->list); + while (ivec->nr > 0) { + ivec->nr--; + iput(ivec->inode[ivec->nr]); + } + kfree(ivec); + } + + if (replaced && rc->stage == UPDATE_DATA_PTRS) + invalidate_extent_cache(root, &key, &next_key); + + return err; +} + +/* + * callback for the work threads. + * this function merges reloc tree with corresponding fs tree, + * and then drops the reloc tree. + */ +static void merge_func(struct btrfs_work *work) +{ + struct btrfs_trans_handle *trans; + struct btrfs_root *root; + struct btrfs_root *reloc_root; + struct async_merge *async; + + async = container_of(work, struct async_merge, work); + reloc_root = async->root; + + if (btrfs_root_refs(&reloc_root->root_item) > 0) { + root = read_fs_root(reloc_root->fs_info, + reloc_root->root_key.offset); + BUG_ON(IS_ERR(root)); + BUG_ON(root->reloc_root != reloc_root); + + merge_reloc_root(async->rc, root); + + trans = btrfs_start_transaction(root, 1); + btrfs_update_reloc_root(trans, root); + btrfs_end_transaction(trans, root); + } + + btrfs_drop_dead_root(reloc_root); + + if (atomic_dec_and_test(async->num_pending)) + complete(async->done); + + kfree(async); +} + +static int merge_reloc_roots(struct reloc_control *rc) +{ + struct async_merge *async; + struct btrfs_root *root; + struct completion done; + atomic_t num_pending; + + init_completion(&done); + atomic_set(&num_pending, 1); + + while (!list_empty(&rc->reloc_roots)) { + root = list_entry(rc->reloc_roots.next, + struct btrfs_root, root_list); + list_del_init(&root->root_list); + + async = kmalloc(sizeof(*async), GFP_NOFS); + BUG_ON(!async); + async->work.func = merge_func; + async->work.flags = 0; + async->rc = rc; + async->root = root; + async->done = &done; + async->num_pending = &num_pending; + atomic_inc(&num_pending); + btrfs_queue_worker(&rc->workers, &async->work); + } + + if (!atomic_dec_and_test(&num_pending)) + wait_for_completion(&done); + + BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); + return 0; +} + +static void free_block_list(struct rb_root *blocks) +{ + struct tree_block *block; + struct rb_node *rb_node; + while ((rb_node = rb_first(blocks))) { + block = rb_entry(rb_node, struct tree_block, rb_node); + rb_erase(rb_node, blocks); + kfree(block); + } +} + +static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, + struct btrfs_root *reloc_root) +{ + struct btrfs_root *root; + + if (reloc_root->last_trans == trans->transid) + return 0; + + root = read_fs_root(reloc_root->fs_info, reloc_root->root_key.offset); + BUG_ON(IS_ERR(root)); + BUG_ON(root->reloc_root != reloc_root); + + return btrfs_record_root_in_trans(trans, root); +} + +/* + * select one tree from trees that references the block. + * for blocks in refernce counted trees, we preper reloc tree. + * if no reloc tree found and reloc_only is true, NULL is returned. + */ +static struct btrfs_root *__select_one_root(struct btrfs_trans_handle *trans, + struct backref_node *node, + struct backref_edge *edges[], + int *nr, int reloc_only) +{ + struct backref_node *next; + struct btrfs_root *root; + int index; + int loop = 0; +again: + index = 0; + next = node; + while (1) { + cond_resched(); + next = walk_up_backref(next, edges, &index); + root = next->root; + if (!root) { + BUG_ON(!node->old_root); + goto skip; + } + + /* no other choice for non-refernce counted tree */ + if (!root->ref_cows) { + BUG_ON(reloc_only); + break; + } + + if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { + record_reloc_root_in_trans(trans, root); + break; + } + + if (loop) { + btrfs_record_root_in_trans(trans, root); + break; + } + + if (reloc_only || next != node) { + if (!root->reloc_root) + btrfs_record_root_in_trans(trans, root); + root = root->reloc_root; + /* + * if the reloc tree was created in current + * transation, there is no node in backref tree + * corresponds to the root of the reloc tree. + */ + if (btrfs_root_last_snapshot(&root->root_item) == + trans->transid - 1) + break; + } +skip: + root = NULL; + next = walk_down_backref(edges, &index); + if (!next || next->level <= node->level) + break; + } + + if (!root && !loop && !reloc_only) { + loop = 1; + goto again; + } + + if (root) + *nr = index; + else + *nr = 0; + + return root; +} + +static noinline_for_stack +struct btrfs_root *select_one_root(struct btrfs_trans_handle *trans, + struct backref_node *node) +{ + struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; + int nr; + return __select_one_root(trans, node, edges, &nr, 0); +} + +static noinline_for_stack +struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, + struct backref_node *node, + struct backref_edge *edges[], int *nr) +{ + return __select_one_root(trans, node, edges, nr, 1); +} + +static void grab_path_buffers(struct btrfs_path *path, + struct backref_node *node, + struct backref_edge *edges[], int nr) +{ + int i = 0; + while (1) { + drop_node_buffer(node); + node->eb = path->nodes[node->level]; + BUG_ON(!node->eb); + if (path->locks[node->level]) + node->locked = 1; + path->nodes[node->level] = NULL; + path->locks[node->level] = 0; + + if (i >= nr) + break; + + edges[i]->blockptr = node->eb->start; + node = edges[i]->node[UPPER]; + i++; + } +} + +/* + * relocate a block tree, and then update pointers in upper level + * blocks that reference the block to point to the new location. + * + * if called by link_to_upper, the block has already been relocated. + * in that case this function just updates pointers. + */ +static int do_relocation(struct btrfs_trans_handle *trans, + struct backref_node *node, + struct btrfs_key *key, + struct btrfs_path *path, int lowest) +{ + struct backref_node *upper; + struct backref_edge *edge; + struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; + struct btrfs_root *root; + struct extent_buffer *eb; + u32 blocksize; + u64 bytenr; + u64 generation; + int nr; + int slot; + int ret; + int err = 0; + + BUG_ON(lowest && node->eb); + + path->lowest_level = node->level + 1; + list_for_each_entry(edge, &node->upper, list[LOWER]) { + cond_resched(); + if (node->eb && node->eb->start == edge->blockptr) + continue; + + upper = edge->node[UPPER]; + root = select_reloc_root(trans, upper, edges, &nr); + if (!root) + continue; + + if (upper->eb && !upper->locked) + drop_node_buffer(upper); + + if (!upper->eb) { + ret = btrfs_search_slot(trans, root, key, path, 0, 1); + if (ret < 0) { + err = ret; + break; + } + BUG_ON(ret > 0); + + slot = path->slots[upper->level]; + + btrfs_unlock_up_safe(path, upper->level + 1); + grab_path_buffers(path, upper, edges, nr); + + btrfs_release_path(NULL, path); + } else { + ret = btrfs_bin_search(upper->eb, key, upper->level, + &slot); + BUG_ON(ret); + } + + bytenr = btrfs_node_blockptr(upper->eb, slot); + if (!lowest) { + if (node->eb->start == bytenr) { + btrfs_tree_unlock(upper->eb); + upper->locked = 0; + continue; + } + } else { + BUG_ON(node->bytenr != bytenr); + } + + blocksize = btrfs_level_size(root, node->level); + generation = btrfs_node_ptr_generation(upper->eb, slot); + eb = read_tree_block(root, bytenr, blocksize, generation); + btrfs_tree_lock(eb); + btrfs_set_lock_blocking(eb); + + if (!node->eb) { + ret = btrfs_cow_block(trans, root, eb, upper->eb, + slot, &eb); + if (ret < 0) { + err = ret; + break; + } + btrfs_set_lock_blocking(eb); + node->eb = eb; + node->locked = 1; + } else { + btrfs_set_node_blockptr(upper->eb, slot, + node->eb->start); + btrfs_set_node_ptr_generation(upper->eb, slot, + trans->transid); + btrfs_mark_buffer_dirty(upper->eb); + + ret = btrfs_inc_extent_ref(trans, root, + node->eb->start, blocksize, + upper->eb->start, + btrfs_header_owner(upper->eb), + node->level, 0); + BUG_ON(ret); + + ret = btrfs_drop_subtree(trans, root, eb, upper->eb); + BUG_ON(ret); + + btrfs_tree_unlock(eb); + free_extent_buffer(eb); + } + if (!lowest) { + btrfs_tree_unlock(upper->eb); + upper->locked = 0; + } + } + path->lowest_level = 0; + return err; +} + +static int link_to_upper(struct btrfs_trans_handle *trans, + struct backref_node *node, + struct btrfs_path *path) +{ + struct btrfs_key key; + if (!node->eb || list_empty(&node->upper)) + return 0; + + btrfs_node_key_to_cpu(node->eb, &key, 0); + return do_relocation(trans, node, &key, path, 0); +} + +static int finish_pending_nodes(struct btrfs_trans_handle *trans, + struct backref_cache *cache, + struct btrfs_path *path) +{ + struct backref_node *node; + int level; + int ret; + int err = 0; + + for (level = 0; level < BTRFS_MAX_LEVEL; level++) { + while (!list_empty(&cache->pending[level])) { + node = list_entry(cache->pending[level].next, + struct backref_node, lower); + BUG_ON(node->level != level); + + ret = link_to_upper(trans, node, path); + if (ret < 0) + err = ret; + /* + * this remove the node from the pending list and + * may add some other nodes to the level + 1 + * pending list + */ + remove_backref_node(cache, node); + } + } + BUG_ON(!RB_EMPTY_ROOT(&cache->rb_root)); + return err; +} + +static void mark_block_processed(struct reloc_control *rc, + struct backref_node *node) +{ + u32 blocksize; + if (node->level == 0 || + in_block_group(node->bytenr, rc->block_group)) { + blocksize = btrfs_level_size(rc->extent_root, node->level); + set_extent_bits(&rc->processed_blocks, node->bytenr, + node->bytenr + blocksize - 1, EXTENT_DIRTY, + GFP_NOFS); + } + node->processed = 1; +} + +/* + * mark a block and all blocks directly/indirectly reference the block + * as processed. + */ +static void update_processed_blocks(struct reloc_control *rc, + struct backref_node *node) +{ + struct backref_node *next = node; + struct backref_edge *edge; + struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; + int index = 0; + + while (next) { + cond_resched(); + while (1) { + if (next->processed) + break; + + mark_block_processed(rc, next); + + if (list_empty(&next->upper)) + break; + + edge = list_entry(next->upper.next, + struct backref_edge, list[LOWER]); + edges[index++] = edge; + next = edge->node[UPPER]; + } + next = walk_down_backref(edges, &index); + } +} + +static int tree_block_processed(u64 bytenr, u32 blocksize, + struct reloc_control *rc) +{ + if (test_range_bit(&rc->processed_blocks, bytenr, + bytenr + blocksize - 1, EXTENT_DIRTY, 1)) + return 1; + return 0; +} + +/* + * check if there are any file extent pointers in the leaf point to + * data require processing + */ +static int check_file_extents(struct reloc_control *rc, + u64 bytenr, u32 blocksize, u64 ptr_gen) +{ + struct btrfs_key found_key; + struct btrfs_file_extent_item *fi; + struct extent_buffer *leaf; + u32 nritems; + int i; + int ret = 0; + + leaf = read_tree_block(rc->extent_root, bytenr, blocksize, ptr_gen); + + nritems = btrfs_header_nritems(leaf); + for (i = 0; i < nritems; i++) { + cond_resched(); + btrfs_item_key_to_cpu(leaf, &found_key, i); + if (found_key.type != 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; + bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); + if (bytenr == 0) + continue; + if (in_block_group(bytenr, rc->block_group)) { + ret = 1; + break; + } + } + free_extent_buffer(leaf); + return ret; +} + +/* + * scan child blocks of a given block to find blocks require processing + */ +static int add_child_blocks(struct btrfs_trans_handle *trans, + struct reloc_control *rc, + struct backref_node *node, + struct rb_root *blocks) +{ + struct tree_block *block; + struct rb_node *rb_node; + u64 bytenr; + u64 ptr_gen; + u32 blocksize; + u32 nritems; + int i; + int err = 0; + + nritems = btrfs_header_nritems(node->eb); + blocksize = btrfs_level_size(rc->extent_root, node->level - 1); + for (i = 0; i < nritems; i++) { + cond_resched(); + bytenr = btrfs_node_blockptr(node->eb, i); + ptr_gen = btrfs_node_ptr_generation(node->eb, i); + if (ptr_gen == trans->transid) + continue; + if (!in_block_group(bytenr, rc->block_group) && + (node->level > 1 || rc->stage == MOVE_DATA_EXTENTS)) + continue; + if (tree_block_processed(bytenr, blocksize, rc)) + continue; + + readahead_tree_block(rc->extent_root, + bytenr, blocksize, ptr_gen); + } + + for (i = 0; i < nritems; i++) { + cond_resched(); + bytenr = btrfs_node_blockptr(node->eb, i); + ptr_gen = btrfs_node_ptr_generation(node->eb, i); + if (ptr_gen == trans->transid) + continue; + if (!in_block_group(bytenr, rc->block_group) && + (node->level > 1 || rc->stage == MOVE_DATA_EXTENTS)) + continue; + if (tree_block_processed(bytenr, blocksize, rc)) + continue; + if (!in_block_group(bytenr, rc->block_group) && + !check_file_extents(rc, bytenr, blocksize, ptr_gen)) + continue; + + block = kmalloc(sizeof(*block), GFP_NOFS); + if (!block) { + err = -ENOMEM; + break; + } + block->bytenr = bytenr; + btrfs_node_key_to_cpu(node->eb, &block->key, i); + block->level = node->level - 1; + block->key_ready = 1; + rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); + BUG_ON(rb_node); + } + if (err) + free_block_list(blocks); + return err; +} + +/* + * find adjacent blocks require processing + */ +static noinline_for_stack +int add_adjacent_blocks(struct btrfs_trans_handle *trans, + struct reloc_control *rc, + struct backref_cache *cache, + struct rb_root *blocks, int level, + struct backref_node **upper) +{ + struct backref_node *node; + int ret = 0; + + WARN_ON(!list_empty(&cache->pending[level])); + + if (list_empty(&cache->pending[level + 1])) + return 1; + + node = list_entry(cache->pending[level + 1].next, + struct backref_node, lower); + if (node->eb) + ret = add_child_blocks(trans, rc, node, blocks); + + *upper = node; + return ret; +} + +static int get_tree_block_key(struct reloc_control *rc, + struct tree_block *block) +{ + struct extent_buffer *eb; + + BUG_ON(block->key_ready); + eb = read_tree_block(rc->extent_root, block->bytenr, + block->key.objectid, block->key.offset); + WARN_ON(btrfs_header_level(eb) != block->level); + if (block->level == 0) + btrfs_item_key_to_cpu(eb, &block->key, 0); + else + btrfs_node_key_to_cpu(eb, &block->key, 0); + free_extent_buffer(eb); + block->key_ready = 1; + return 0; +} + +static int reada_tree_block(struct reloc_control *rc, + struct tree_block *block) +{ + BUG_ON(block->key_ready); + readahead_tree_block(rc->extent_root, block->bytenr, + block->key.objectid, block->key.offset); + return 0; +} + +/* + * helper function to relocate a tree block + */ +static int relocate_tree_block(struct btrfs_trans_handle *trans, + struct reloc_control *rc, + struct backref_node *node, + struct btrfs_key *key, + struct btrfs_path *path) +{ + struct btrfs_root *root; + int ret; + + root = select_one_root(trans, node); + if (unlikely(!root)) { + rc->found_old_snapshot = 1; + update_processed_blocks(rc, node); + return 0; + } + + if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { + ret = do_relocation(trans, node, key, path, 1); + if (ret < 0) + goto out; + if (node->level == 0 && rc->stage == UPDATE_DATA_PTRS) { + ret = replace_file_extents(trans, rc, root, + node->eb, NULL); + if (ret < 0) + goto out; + } + drop_node_buffer(node); + } else if (!root->ref_cows) { + path->lowest_level = node->level; + ret = btrfs_search_slot(trans, root, key, path, 0, 1); + btrfs_release_path(root, path); + if (ret < 0) + goto out; + } else if (root != node->root) { + WARN_ON(node->level > 0 || rc->stage != UPDATE_DATA_PTRS); + } + + update_processed_blocks(rc, node); + ret = 0; +out: + drop_node_buffer(node); + return ret; +} + +/* + * relocate a list of blocks + */ +static noinline_for_stack +int relocate_tree_blocks(struct btrfs_trans_handle *trans, + struct reloc_control *rc, struct rb_root *blocks) +{ + struct backref_cache *cache; + struct backref_node *node; + struct btrfs_path *path; + struct tree_block *block; + struct rb_node *rb_node; + int level = -1; + int ret; + int err = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + cache = kmalloc(sizeof(*cache), GFP_NOFS); + if (!cache) { + btrfs_free_path(path); + return -ENOMEM; + } + + backref_cache_init(cache); + + rb_node = rb_first(blocks); + while (rb_node) { + block = rb_entry(rb_node, struct tree_block, rb_node); + if (level == -1) + level = block->level; + else + BUG_ON(level != block->level); + if (!block->key_ready) + reada_tree_block(rc, block); + rb_node = rb_next(rb_node); + } + + rb_node = rb_first(blocks); + while (rb_node) { + block = rb_entry(rb_node, struct tree_block, rb_node); + if (!block->key_ready) + get_tree_block_key(rc, block); + rb_node = rb_next(rb_node); + } + + rb_node = rb_first(blocks); + while (rb_node) { + block = rb_entry(rb_node, struct tree_block, rb_node); + + node = build_backref_tree(rc, cache, &block->key, + block->level, block->bytenr); + if (IS_ERR(node)) { + err = PTR_ERR(node); + goto out; + } + + ret = relocate_tree_block(trans, rc, node, &block->key, + path); + if (ret < 0) { + err = ret; + goto out; + } + remove_backref_node(cache, node); + rb_node = rb_next(rb_node); + } + + if (level > 0) + goto out; + + free_block_list(blocks); + + /* + * now backrefs of some upper level tree blocks have been cached, + * try relocating blocks referenced by these upper level blocks. + */ + while (1) { + struct backref_node *upper = NULL; + if (trans->transaction->in_commit || + trans->transaction->delayed_refs.flushing) + break; + + ret = add_adjacent_blocks(trans, rc, cache, blocks, level, + &upper); + if (ret < 0) + err = ret; + if (ret != 0) + break; + + rb_node = rb_first(blocks); + while (rb_node) { + block = rb_entry(rb_node, struct tree_block, rb_node); + if (trans->transaction->in_commit || + trans->transaction->delayed_refs.flushing) + goto out; + BUG_ON(!block->key_ready); + node = build_backref_tree(rc, cache, &block->key, + level, block->bytenr); + if (IS_ERR(node)) { + err = PTR_ERR(node); + goto out; + } + + ret = relocate_tree_block(trans, rc, node, + &block->key, path); + if (ret < 0) { + err = ret; + goto out; + } + remove_backref_node(cache, node); + rb_node = rb_next(rb_node); + } + free_block_list(blocks); + + if (upper) { + ret = link_to_upper(trans, upper, path); + if (ret < 0) { + err = ret; + break; + } + remove_backref_node(cache, upper); + } + } +out: + free_block_list(blocks); + + ret = finish_pending_nodes(trans, cache, path); + if (ret < 0) + err = ret; + + kfree(cache); + btrfs_free_path(path); + return err; +} + +static noinline_for_stack +int relocate_inode_pages(struct inode *inode, u64 start, u64 len) +{ + u64 page_start; + u64 page_end; + unsigned long i; + unsigned long first_index; + unsigned long last_index; + unsigned int total_read = 0; + unsigned int total_dirty = 0; + struct page *page; + struct file_ra_state *ra; + struct btrfs_ordered_extent *ordered; + struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + int ret = 0; + + ra = kzalloc(sizeof(*ra), GFP_NOFS); + if (!ra) + return -ENOMEM; + + mutex_lock(&inode->i_mutex); + first_index = start >> PAGE_CACHE_SHIFT; + last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; + + /* make sure the dirty trick played by the caller work */ + ret = invalidate_inode_pages2_range(inode->i_mapping, + first_index, last_index); + if (ret) + goto out_unlock; + + file_ra_state_init(ra, inode->i_mapping); + + for (i = first_index ; i <= last_index; i++) { + if (total_read % ra->ra_pages == 0) { + btrfs_force_ra(inode->i_mapping, ra, NULL, i, + min(last_index, ra->ra_pages + i - 1)); + } + total_read++; +again: + if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) + BUG_ON(1); + page = grab_cache_page(inode->i_mapping, i); + if (!page) { + ret = -ENOMEM; + goto out_unlock; + } + if (!PageUptodate(page)) { + btrfs_readpage(NULL, page); + lock_page(page); + if (!PageUptodate(page)) { + unlock_page(page); + page_cache_release(page); + ret = -EIO; + goto out_unlock; + } + } + wait_on_page_writeback(page); + + page_start = (u64)page->index << PAGE_CACHE_SHIFT; + page_end = page_start + PAGE_CACHE_SIZE - 1; + lock_extent(io_tree, page_start, page_end, GFP_NOFS); + + ordered = btrfs_lookup_ordered_extent(inode, page_start); + if (ordered) { + unlock_extent(io_tree, page_start, page_end, GFP_NOFS); + unlock_page(page); + page_cache_release(page); + btrfs_start_ordered_extent(inode, ordered, 1); + btrfs_put_ordered_extent(ordered); + goto again; + } + set_page_extent_mapped(page); + + if (i == first_index) + set_extent_bits(io_tree, page_start, page_end, + EXTENT_BOUNDARY, GFP_NOFS); + btrfs_set_extent_delalloc(inode, page_start, page_end); + + set_page_dirty(page); + total_dirty++; + + unlock_extent(io_tree, page_start, page_end, GFP_NOFS); + unlock_page(page); + page_cache_release(page); + } +out_unlock: + mutex_unlock(&inode->i_mutex); + kfree(ra); + balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); + return ret; +} + +static noinline_for_stack +int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; + struct extent_map *em; + u64 start = extent_key->objectid - BTRFS_I(inode)->index_cnt; + u64 end = start + extent_key->offset - 1; + + em = alloc_extent_map(GFP_NOFS); + em->start = start; + em->len = extent_key->offset; + em->block_len = extent_key->offset; + em->block_start = extent_key->objectid; + em->bdev = root->fs_info->fs_devices->latest_bdev; + set_bit(EXTENT_FLAG_PINNED, &em->flags); + + /* setup extent map to cheat btrfs_readpage */ + lock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS); + while (1) { + int ret; + spin_lock(&em_tree->lock); + ret = add_extent_mapping(em_tree, em); + spin_unlock(&em_tree->lock); + if (ret != -EEXIST) { + free_extent_map(em); + break; + } + btrfs_drop_extent_cache(inode, start, end, 0); + } + unlock_extent(&BTRFS_I(inode)->io_tree, start, end, GFP_NOFS); + + return relocate_inode_pages(inode, start, extent_key->offset); +} + +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 +static int get_ref_objectid_v0(struct reloc_control *rc, + struct btrfs_path *path, + struct btrfs_key *extent_key, + u64 *ref_objectid, int *path_change) +{ + struct btrfs_key key; + struct extent_buffer *leaf; + struct btrfs_extent_ref_v0 *ref0; + int ret; + int slot; + + leaf = path->nodes[0]; + slot = path->slots[0]; + while (1) { + if (slot >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(rc->extent_root, path); + if (ret < 0) + return ret; + BUG_ON(ret > 0); + leaf = path->nodes[0]; + slot = path->slots[0]; + if (path_change) + *path_change = 1; + } + btrfs_item_key_to_cpu(leaf, &key, slot); + if (key.objectid != extent_key->objectid) + return -ENOENT; + + if (key.type != BTRFS_EXTENT_REF_V0_KEY) { + slot++; + continue; + } + ref0 = btrfs_item_ptr(leaf, slot, + struct btrfs_extent_ref_v0); + *ref_objectid = btrfs_ref_objectid_v0(leaf, ref0); + break; + } + return 0; +} +#endif + +/* + * helper to add a tree block to the list. + * the major work is getting the generation and level of the block + */ +static int add_tree_block(struct reloc_control *rc, + struct btrfs_key *extent_key, + struct btrfs_path *path, + struct rb_root *blocks) +{ + struct extent_buffer *eb; + struct btrfs_extent_item *ei; + struct btrfs_tree_block_info *bi; + struct tree_block *block; + struct rb_node *rb_node; + u32 item_size; + int level = -1; + int generation; + + eb = path->nodes[0]; + item_size = btrfs_item_size_nr(eb, path->slots[0]); + + if (item_size >= sizeof(*ei) + sizeof(*bi)) { + ei = btrfs_item_ptr(eb, path->slots[0], + struct btrfs_extent_item); + bi = (struct btrfs_tree_block_info *)(ei + 1); + generation = btrfs_extent_generation(eb, ei); + level = btrfs_tree_block_level(eb, bi); + } else { +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + u64 ref_owner; + int ret; + + BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0)); + ret = get_ref_objectid_v0(rc, path, extent_key, + &ref_owner, NULL); + BUG_ON(ref_owner >= BTRFS_MAX_LEVEL); + level = (int)ref_owner; + /* FIXME: get real generation */ + generation = 0; +#else + BUG(); +#endif + } + + btrfs_release_path(rc->extent_root, path); + + BUG_ON(level == -1); + + block = kmalloc(sizeof(*block), GFP_NOFS); + if (!block) + return -ENOMEM; + + block->bytenr = extent_key->objectid; + block->key.objectid = extent_key->offset; + block->key.offset = generation; + block->level = level; + block->key_ready = 0; + + rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); + BUG_ON(rb_node); + + return 0; +} + +/* + * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY + */ +static int __add_tree_block(struct reloc_control *rc, + u64 bytenr, u32 blocksize, + struct rb_root *blocks) +{ + struct btrfs_path *path; + struct btrfs_key key; + int ret; + + if (tree_block_processed(bytenr, blocksize, rc)) + return 0; + + if (tree_search(blocks, bytenr)) + return 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = bytenr; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = blocksize; + + path->search_commit_root = 1; + path->skip_locking = 1; + ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); + if (ret < 0) + goto out; + BUG_ON(ret); + + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + ret = add_tree_block(rc, &key, path, blocks); +out: + btrfs_free_path(path); + return ret; +} + +/* + * helper to check if the block use full backrefs for pointers in it + */ +static int block_use_full_backref(struct reloc_control *rc, + struct extent_buffer *eb) +{ + struct btrfs_path *path; + struct btrfs_extent_item *ei; + struct btrfs_key key; + u64 flags; + int ret; + + if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) || + btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV) + return 1; + + path = btrfs_alloc_path(); + BUG_ON(!path); + + key.objectid = eb->start; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = eb->len; + + path->search_commit_root = 1; + path->skip_locking = 1; + ret = btrfs_search_slot(NULL, rc->extent_root, + &key, path, 0, 0); + BUG_ON(ret); + + ei = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_extent_item); + flags = btrfs_extent_flags(path->nodes[0], ei); + BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)); + if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) + ret = 1; + else + ret = 0; + btrfs_free_path(path); + return ret; +} + +/* + * helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY + * this function scans fs tree to find blocks reference the data extent + */ +static int find_data_references(struct reloc_control *rc, + struct btrfs_key *extent_key, + struct extent_buffer *leaf, + struct btrfs_extent_data_ref *ref, + struct rb_root *blocks) +{ + struct btrfs_path *path; + struct tree_block *block; + struct btrfs_root *root; + struct btrfs_file_extent_item *fi; + struct rb_node *rb_node; + struct btrfs_key key; + u64 ref_root; + u64 ref_objectid; + u64 ref_offset; + u32 ref_count; + u32 nritems; + int err = 0; + int added = 0; + int counted; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + ref_root = btrfs_extent_data_ref_root(leaf, ref); + ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref); + ref_offset = btrfs_extent_data_ref_offset(leaf, ref); + ref_count = btrfs_extent_data_ref_count(leaf, ref); + + root = read_fs_root(rc->extent_root->fs_info, ref_root); + if (IS_ERR(root)) { + err = PTR_ERR(root); + goto out; + } + + key.objectid = ref_objectid; + key.offset = ref_offset; + key.type = BTRFS_EXTENT_DATA_KEY; + + path->search_commit_root = 1; + path->skip_locking = 1; + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (ret < 0) { + err = ret; + goto out; + } + + leaf = path->nodes[0]; + nritems = btrfs_header_nritems(leaf); + /* + * the references in tree blocks that use full backrefs + * are not counted in + */ + if (block_use_full_backref(rc, leaf)) + counted = 0; + else + counted = 1; + rb_node = tree_search(blocks, leaf->start); + if (rb_node) { + if (counted) + added = 1; + else + path->slots[0] = nritems; + } + + while (ref_count > 0) { + while (path->slots[0] >= nritems) { + ret = btrfs_next_leaf(root, path); + if (ret < 0) { + err = ret; + goto out; + } + if (ret > 0) { + WARN_ON(1); + goto out; + } + + leaf = path->nodes[0]; + nritems = btrfs_header_nritems(leaf); + added = 0; + + if (block_use_full_backref(rc, leaf)) + counted = 0; + else + counted = 1; + rb_node = tree_search(blocks, leaf->start); + if (rb_node) { + if (counted) + added = 1; + else + path->slots[0] = nritems; + } + } + + btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); + if (key.objectid != ref_objectid || + key.type != BTRFS_EXTENT_DATA_KEY) { + WARN_ON(1); + break; + } + + fi = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + + if (btrfs_file_extent_type(leaf, fi) == + BTRFS_FILE_EXTENT_INLINE) + goto next; + + if (btrfs_file_extent_disk_bytenr(leaf, fi) != + extent_key->objectid) + goto next; + + key.offset -= btrfs_file_extent_offset(leaf, fi); + if (key.offset != ref_offset) + goto next; + + if (counted) + ref_count--; + if (added) + goto next; + + if (!tree_block_processed(leaf->start, leaf->len, rc)) { + block = kmalloc(sizeof(*block), GFP_NOFS); + if (!block) { + err = -ENOMEM; + break; + } + block->bytenr = leaf->start; + btrfs_item_key_to_cpu(leaf, &block->key, 0); + block->level = 0; + block->key_ready = 1; + rb_node = tree_insert(blocks, block->bytenr, + &block->rb_node); + BUG_ON(rb_node); + } + if (counted) + added = 1; + else + path->slots[0] = nritems; +next: + path->slots[0]++; + + } +out: + btrfs_free_path(path); + return err; +} + +/* + * hepler to find all tree blocks that reference a given data extent + */ +static noinline_for_stack +int add_data_references(struct reloc_control *rc, + struct btrfs_key *extent_key, + struct btrfs_path *path, + struct rb_root *blocks) +{ + struct btrfs_key key; + struct extent_buffer *eb; + struct btrfs_extent_data_ref *dref; + struct btrfs_extent_inline_ref *iref; + unsigned long ptr; + unsigned long end; + u32 blocksize; + int ret; + int err = 0; + + ret = get_new_location(rc->data_inode, NULL, extent_key->objectid, + extent_key->offset); + BUG_ON(ret < 0); + if (ret > 0) { + /* the relocated data is fragmented */ + rc->extents_skipped++; + btrfs_release_path(rc->extent_root, path); + return 0; + } + + blocksize = btrfs_level_size(rc->extent_root, 0); + + eb = path->nodes[0]; + ptr = btrfs_item_ptr_offset(eb, path->slots[0]); + end = ptr + btrfs_item_size_nr(eb, path->slots[0]); +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + if (ptr + sizeof(struct btrfs_extent_item_v0) == end) + ptr = end; + else +#endif + ptr += sizeof(struct btrfs_extent_item); + + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + key.type = btrfs_extent_inline_ref_type(eb, iref); + if (key.type == BTRFS_SHARED_DATA_REF_KEY) { + key.offset = btrfs_extent_inline_ref_offset(eb, iref); + ret = __add_tree_block(rc, key.offset, blocksize, + blocks); + } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + ret = find_data_references(rc, extent_key, + eb, dref, blocks); + } else { + BUG(); + } + ptr += btrfs_extent_inline_ref_size(key.type); + } + WARN_ON(ptr > end); + + while (1) { + cond_resched(); + eb = path->nodes[0]; + if (path->slots[0] >= btrfs_header_nritems(eb)) { + ret = btrfs_next_leaf(rc->extent_root, path); + if (ret < 0) { + err = ret; + break; + } + if (ret > 0) + break; + eb = path->nodes[0]; + } + + btrfs_item_key_to_cpu(eb, &key, path->slots[0]); + if (key.objectid != extent_key->objectid) + break; + +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + if (key.type == BTRFS_SHARED_DATA_REF_KEY || + key.type == BTRFS_EXTENT_REF_V0_KEY) { +#else + BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); + if (key.type == BTRFS_SHARED_DATA_REF_KEY) { +#endif + ret = __add_tree_block(rc, key.offset, blocksize, + blocks); + } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { + dref = btrfs_item_ptr(eb, path->slots[0], + struct btrfs_extent_data_ref); + ret = find_data_references(rc, extent_key, + eb, dref, blocks); + } else { + ret = 0; + } + if (ret) { + err = ret; + break; + } + path->slots[0]++; + } + btrfs_release_path(rc->extent_root, path); + if (err) + free_block_list(blocks); + return err; +} + +/* + * hepler to find next unprocessed extent + */ +static noinline_for_stack +int find_next_extent(struct btrfs_trans_handle *trans, + struct reloc_control *rc, struct btrfs_path *path) +{ + struct btrfs_key key; + struct extent_buffer *leaf; + u64 start, end, last; + int ret; + + last = rc->block_group->key.objectid + rc->block_group->key.offset; + while (1) { + cond_resched(); + if (rc->search_start >= last) { + ret = 1; + break; + } + + key.objectid = rc->search_start; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = 0; + + path->search_commit_root = 1; + path->skip_locking = 1; + ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, + 0, 0); + if (ret < 0) + break; +next: + leaf = path->nodes[0]; + if (path->slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(rc->extent_root, path); + if (ret != 0) + break; + leaf = path->nodes[0]; + } + + btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); + if (key.objectid >= last) { + ret = 1; + break; + } + + if (key.type != BTRFS_EXTENT_ITEM_KEY || + key.objectid + key.offset <= rc->search_start) { + path->slots[0]++; + goto next; + } + + ret = find_first_extent_bit(&rc->processed_blocks, + key.objectid, &start, &end, + EXTENT_DIRTY); + + if (ret == 0 && start <= key.objectid) { + btrfs_release_path(rc->extent_root, path); + rc->search_start = end + 1; + } else { + rc->search_start = key.objectid + key.offset; + return 0; + } + } + btrfs_release_path(rc->extent_root, path); + return ret; +} + +static void set_reloc_control(struct reloc_control *rc) +{ + struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; + mutex_lock(&fs_info->trans_mutex); + fs_info->reloc_ctl = rc; + mutex_unlock(&fs_info->trans_mutex); +} + +static void unset_reloc_control(struct reloc_control *rc) +{ + struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; + mutex_lock(&fs_info->trans_mutex); + fs_info->reloc_ctl = NULL; + mutex_unlock(&fs_info->trans_mutex); +} + +static int check_extent_flags(u64 flags) +{ + if ((flags & BTRFS_EXTENT_FLAG_DATA) && + (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) + return 1; + if (!(flags & BTRFS_EXTENT_FLAG_DATA) && + !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) + return 1; + if ((flags & BTRFS_EXTENT_FLAG_DATA) && + (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) + return 1; + return 0; +} + +static noinline_for_stack int relocate_block_group(struct reloc_control *rc) +{ + struct rb_root blocks = RB_ROOT; + struct btrfs_key key; + struct btrfs_trans_handle *trans = NULL; + struct btrfs_path *path; + struct btrfs_extent_item *ei; + unsigned long nr; + u64 flags; + u32 item_size; + int ret; + int err = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + rc->search_start = rc->block_group->key.objectid; + clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY, + GFP_NOFS); + + rc->create_reloc_root = 1; + set_reloc_control(rc); + + trans = btrfs_start_transaction(rc->extent_root, 1); + btrfs_commit_transaction(trans, rc->extent_root); + + while (1) { + trans = btrfs_start_transaction(rc->extent_root, 1); + + ret = find_next_extent(trans, rc, path); + if (ret < 0) + err = ret; + if (ret != 0) + break; + + rc->extents_found++; + + ei = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_extent_item); + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + item_size = btrfs_item_size_nr(path->nodes[0], + path->slots[0]); + if (item_size >= sizeof(*ei)) { + flags = btrfs_extent_flags(path->nodes[0], ei); + ret = check_extent_flags(flags); + BUG_ON(ret); + + } else { +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + u64 ref_owner; + int path_change = 0; + + BUG_ON(item_size != + sizeof(struct btrfs_extent_item_v0)); + ret = get_ref_objectid_v0(rc, path, &key, &ref_owner, + &path_change); + if (ref_owner < BTRFS_FIRST_FREE_OBJECTID) + flags = BTRFS_EXTENT_FLAG_TREE_BLOCK; + else + flags = BTRFS_EXTENT_FLAG_DATA; + + if (path_change) { + btrfs_release_path(rc->extent_root, path); + + path->search_commit_root = 1; + path->skip_locking = 1; + ret = btrfs_search_slot(NULL, rc->extent_root, + &key, path, 0, 0); + if (ret < 0) { + err = ret; + break; + } + BUG_ON(ret > 0); + } +#else + BUG(); +#endif + } + + if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { + ret = add_tree_block(rc, &key, path, &blocks); + } else if (rc->stage == UPDATE_DATA_PTRS && + (flags & BTRFS_EXTENT_FLAG_DATA)) { + ret = add_data_references(rc, &key, path, &blocks); + } else { + btrfs_release_path(rc->extent_root, path); + ret = 0; + } + if (ret < 0) { + err = 0; + break; + } + + if (!RB_EMPTY_ROOT(&blocks)) { + ret = relocate_tree_blocks(trans, rc, &blocks); + if (ret < 0) { + err = ret; + break; + } + } + + nr = trans->blocks_used; + btrfs_end_transaction_throttle(trans, rc->extent_root); + trans = NULL; + btrfs_btree_balance_dirty(rc->extent_root, nr); + + if (rc->stage == MOVE_DATA_EXTENTS && + (flags & BTRFS_EXTENT_FLAG_DATA)) { + rc->found_file_extent = 1; + ret = relocate_data_extent(rc->data_inode, &key); + if (ret < 0) { + err = ret; + break; + } + } + } + btrfs_free_path(path); + + if (trans) { + nr = trans->blocks_used; + btrfs_end_transaction(trans, rc->extent_root); + btrfs_btree_balance_dirty(rc->extent_root, nr); + } + + rc->create_reloc_root = 0; + smp_mb(); + + if (rc->extents_found > 0) { + trans = btrfs_start_transaction(rc->extent_root, 1); + btrfs_commit_transaction(trans, rc->extent_root); + } + + merge_reloc_roots(rc); + + unset_reloc_control(rc); + + /* get rid of pinned extents */ + trans = btrfs_start_transaction(rc->extent_root, 1); + btrfs_commit_transaction(trans, rc->extent_root); + + return err; +} + +static int __insert_orphan_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 objectid, u64 size) +{ + struct btrfs_path *path; + struct btrfs_inode_item *item; + struct extent_buffer *leaf; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + ret = btrfs_insert_empty_inode(trans, root, path, objectid); + if (ret) + goto out; + + leaf = path->nodes[0]; + item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); + memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); + btrfs_set_inode_generation(leaf, item, 1); + btrfs_set_inode_size(leaf, item, size); + btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); + btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(root, path); +out: + btrfs_free_path(path); + return ret; +} + +/* + * helper to create inode for data relocation. + * the inode is in data relocation tree and its link count is 0 + */ +static struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, + struct btrfs_block_group_cache *group) +{ + struct inode *inode = NULL; + struct btrfs_trans_handle *trans; + struct btrfs_root *root; + struct btrfs_key key; + unsigned long nr; + u64 objectid = BTRFS_FIRST_FREE_OBJECTID; + int err = 0; + + root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); + if (IS_ERR(root)) + return ERR_CAST(root); + + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + + err = btrfs_find_free_objectid(trans, root, objectid, &objectid); + if (err) + goto out; + + err = __insert_orphan_inode(trans, root, objectid, group->key.offset); + BUG_ON(err); + + err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, + group->key.offset, 0, group->key.offset, + 0, 0, 0); + BUG_ON(err); + + key.objectid = objectid; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + inode = btrfs_iget(root->fs_info->sb, &key, root); + BUG_ON(IS_ERR(inode) || is_bad_inode(inode)); + BTRFS_I(inode)->index_cnt = group->key.objectid; + + err = btrfs_orphan_add(trans, inode); +out: + nr = trans->blocks_used; + btrfs_end_transaction(trans, root); + + btrfs_btree_balance_dirty(root, nr); + if (err) { + if (inode) + iput(inode); + inode = ERR_PTR(err); + } + return inode; +} + +/* + * function to relocate all extents in a block group. + */ +int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) +{ + struct btrfs_fs_info *fs_info = extent_root->fs_info; + struct reloc_control *rc; + int ret; + int err = 0; + + rc = kzalloc(sizeof(*rc), GFP_NOFS); + if (!rc) + return -ENOMEM; + + mapping_tree_init(&rc->reloc_root_tree); + extent_io_tree_init(&rc->processed_blocks, NULL, GFP_NOFS); + INIT_LIST_HEAD(&rc->reloc_roots); + + rc->block_group = btrfs_lookup_block_group(fs_info, group_start); + BUG_ON(!rc->block_group); + + btrfs_init_workers(&rc->workers, "relocate", + fs_info->thread_pool_size); + + rc->extent_root = extent_root; + btrfs_prepare_block_group_relocation(extent_root, rc->block_group); + + rc->data_inode = create_reloc_inode(fs_info, rc->block_group); + if (IS_ERR(rc->data_inode)) { + err = PTR_ERR(rc->data_inode); + rc->data_inode = NULL; + goto out; + } + + printk(KERN_INFO "btrfs: relocating block group %llu flags %llu\n", + (unsigned long long)rc->block_group->key.objectid, + (unsigned long long)rc->block_group->flags); + + btrfs_start_delalloc_inodes(fs_info->tree_root); + btrfs_wait_ordered_extents(fs_info->tree_root, 0); + + while (1) { + mutex_lock(&fs_info->cleaner_mutex); + btrfs_clean_old_snapshots(fs_info->tree_root); + mutex_unlock(&fs_info->cleaner_mutex); + + rc->extents_found = 0; + rc->extents_skipped = 0; + + ret = relocate_block_group(rc); + if (ret < 0) { + err = ret; + break; + } + + if (rc->extents_found == 0) + break; + + printk(KERN_INFO "btrfs: found %llu extents\n", + (unsigned long long)rc->extents_found); + + if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { + btrfs_wait_ordered_range(rc->data_inode, 0, (u64)-1); + invalidate_mapping_pages(rc->data_inode->i_mapping, + 0, -1); + rc->stage = UPDATE_DATA_PTRS; + } else if (rc->stage == UPDATE_DATA_PTRS && + rc->extents_skipped >= rc->extents_found) { + iput(rc->data_inode); + rc->data_inode = create_reloc_inode(fs_info, + rc->block_group); + if (IS_ERR(rc->data_inode)) { + err = PTR_ERR(rc->data_inode); + rc->data_inode = NULL; + break; + } + rc->stage = MOVE_DATA_EXTENTS; + rc->found_file_extent = 0; + } + } + + filemap_fdatawrite_range(fs_info->btree_inode->i_mapping, + rc->block_group->key.objectid, + rc->block_group->key.objectid + + rc->block_group->key.offset - 1); + + WARN_ON(rc->block_group->pinned > 0); + WARN_ON(rc->block_group->reserved > 0); + WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); +out: + iput(rc->data_inode); + btrfs_stop_workers(&rc->workers); + btrfs_put_block_group(rc->block_group); + kfree(rc); + return err; +} + +/* + * recover relocation interrupted by system crash. + * + * this function resumes merging reloc trees with corresponding fs trees. + * this is important for keeping the sharing of tree blocks + */ +int btrfs_recover_relocation(struct btrfs_root *root) +{ + LIST_HEAD(reloc_roots); + struct btrfs_key key; + struct btrfs_root *fs_root; + struct btrfs_root *reloc_root; + struct btrfs_path *path; + struct extent_buffer *leaf; + struct reloc_control *rc = NULL; + struct btrfs_trans_handle *trans; + int ret; + int err = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = BTRFS_TREE_RELOC_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + while (1) { + ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, + path, 0, 0); + if (ret < 0) { + err = ret; + goto out; + } + if (ret > 0) { + if (path->slots[0] == 0) + break; + path->slots[0]--; + } + leaf = path->nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); + btrfs_release_path(root->fs_info->tree_root, path); + + if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || + key.type != BTRFS_ROOT_ITEM_KEY) + break; + + reloc_root = btrfs_read_fs_root_no_radix(root, &key); + if (IS_ERR(reloc_root)) { + err = PTR_ERR(reloc_root); + goto out; + } + + list_add(&reloc_root->root_list, &reloc_roots); + + if (btrfs_root_refs(&reloc_root->root_item) > 0) { + fs_root = read_fs_root(root->fs_info, + reloc_root->root_key.offset); + if (IS_ERR(fs_root)) { + err = PTR_ERR(fs_root); + goto out; + } + } + + if (key.offset == 0) + break; + + key.offset--; + } + btrfs_release_path(root->fs_info->tree_root, path); + + if (list_empty(&reloc_roots)) + goto out; + + rc = kzalloc(sizeof(*rc), GFP_NOFS); + if (!rc) { + err = -ENOMEM; + goto out; + } + + mapping_tree_init(&rc->reloc_root_tree); + INIT_LIST_HEAD(&rc->reloc_roots); + btrfs_init_workers(&rc->workers, "relocate", + root->fs_info->thread_pool_size); + rc->extent_root = root->fs_info->extent_root; + + set_reloc_control(rc); + + while (!list_empty(&reloc_roots)) { + reloc_root = list_entry(reloc_roots.next, + struct btrfs_root, root_list); + list_del(&reloc_root->root_list); + + if (btrfs_root_refs(&reloc_root->root_item) == 0) { + list_add_tail(&reloc_root->root_list, + &rc->reloc_roots); + continue; + } + + fs_root = read_fs_root(root->fs_info, + reloc_root->root_key.offset); + BUG_ON(IS_ERR(fs_root)); + + __add_reloc_root(reloc_root); + fs_root->reloc_root = reloc_root; + } + + trans = btrfs_start_transaction(rc->extent_root, 1); + btrfs_commit_transaction(trans, rc->extent_root); + + merge_reloc_roots(rc); + + unset_reloc_control(rc); + + trans = btrfs_start_transaction(rc->extent_root, 1); + btrfs_commit_transaction(trans, rc->extent_root); +out: + if (rc) { + btrfs_stop_workers(&rc->workers); + kfree(rc); + } + while (!list_empty(&reloc_roots)) { + reloc_root = list_entry(reloc_roots.next, + struct btrfs_root, root_list); + list_del(&reloc_root->root_list); + free_extent_buffer(reloc_root->node); + free_extent_buffer(reloc_root->commit_root); + kfree(reloc_root); + } + btrfs_free_path(path); + + if (err == 0) { + /* cleanup orphan inode in data relocation tree */ + fs_root = read_fs_root(root->fs_info, + BTRFS_DATA_RELOC_TREE_OBJECTID); + if (IS_ERR(fs_root)) + err = PTR_ERR(fs_root); + } + return err; +} + +/* + * helper to add ordered checksum for data relocation. + * + * cloning checksum properly handles the nodatasum extents. + * it also saves CPU time to re-calculate the checksum. + */ +int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) +{ + struct btrfs_ordered_sum *sums; + struct btrfs_sector_sum *sector_sum; + struct btrfs_ordered_extent *ordered; + struct btrfs_root *root = BTRFS_I(inode)->root; + size_t offset; + int ret; + u64 disk_bytenr; + LIST_HEAD(list); + + ordered = btrfs_lookup_ordered_extent(inode, file_pos); + BUG_ON(ordered->file_offset != file_pos || ordered->len != len); + + disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; + ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, + disk_bytenr + len - 1, &list); + + while (!list_empty(&list)) { + sums = list_entry(list.next, struct btrfs_ordered_sum, list); + list_del_init(&sums->list); + + sector_sum = sums->sums; + sums->bytenr = ordered->start; + + offset = 0; + while (offset < sums->len) { + sector_sum->bytenr += ordered->start - disk_bytenr; + sector_sum++; + offset += root->sectorsize; + } + + btrfs_add_ordered_sum(inode, ordered, sums); + } + btrfs_put_ordered_extent(ordered); + return 0; +} |