1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 25d4f98a2SYan Zheng /* 35d4f98a2SYan Zheng * Copyright (C) 2009 Oracle. All rights reserved. 45d4f98a2SYan Zheng */ 55d4f98a2SYan Zheng 65d4f98a2SYan Zheng #include <linux/sched.h> 75d4f98a2SYan Zheng #include <linux/pagemap.h> 85d4f98a2SYan Zheng #include <linux/writeback.h> 95d4f98a2SYan Zheng #include <linux/blkdev.h> 105d4f98a2SYan Zheng #include <linux/rbtree.h> 115a0e3ad6STejun Heo #include <linux/slab.h> 12726a3421SQu Wenruo #include <linux/error-injection.h> 135d4f98a2SYan Zheng #include "ctree.h" 145d4f98a2SYan Zheng #include "disk-io.h" 155d4f98a2SYan Zheng #include "transaction.h" 165d4f98a2SYan Zheng #include "volumes.h" 175d4f98a2SYan Zheng #include "locking.h" 185d4f98a2SYan Zheng #include "btrfs_inode.h" 195d4f98a2SYan Zheng #include "async-thread.h" 200af3d00bSJosef Bacik #include "free-space-cache.h" 21581bb050SLi Zefan #include "inode-map.h" 2262b99540SQu Wenruo #include "qgroup.h" 23cdccee99SLiu Bo #include "print-tree.h" 2486736342SJosef Bacik #include "delalloc-space.h" 25aac0023cSJosef Bacik #include "block-group.h" 2619b546d7SQu Wenruo #include "backref.h" 27e9a28dc5SQu Wenruo #include "misc.h" 285d4f98a2SYan Zheng 295d4f98a2SYan Zheng /* 300c891389SQu Wenruo * Relocation overview 310c891389SQu Wenruo * 320c891389SQu Wenruo * [What does relocation do] 330c891389SQu Wenruo * 340c891389SQu Wenruo * The objective of relocation is to relocate all extents of the target block 350c891389SQu Wenruo * group to other block groups. 360c891389SQu Wenruo * This is utilized by resize (shrink only), profile converting, compacting 370c891389SQu Wenruo * space, or balance routine to spread chunks over devices. 380c891389SQu Wenruo * 390c891389SQu Wenruo * Before | After 400c891389SQu Wenruo * ------------------------------------------------------------------ 410c891389SQu Wenruo * BG A: 10 data extents | BG A: deleted 420c891389SQu Wenruo * BG B: 2 data extents | BG B: 10 data extents (2 old + 8 relocated) 430c891389SQu Wenruo * BG C: 1 extents | BG C: 3 data extents (1 old + 2 relocated) 440c891389SQu Wenruo * 450c891389SQu Wenruo * [How does relocation work] 460c891389SQu Wenruo * 470c891389SQu Wenruo * 1. Mark the target block group read-only 480c891389SQu Wenruo * New extents won't be allocated from the target block group. 490c891389SQu Wenruo * 500c891389SQu Wenruo * 2.1 Record each extent in the target block group 510c891389SQu Wenruo * To build a proper map of extents to be relocated. 520c891389SQu Wenruo * 530c891389SQu Wenruo * 2.2 Build data reloc tree and reloc trees 540c891389SQu Wenruo * Data reloc tree will contain an inode, recording all newly relocated 550c891389SQu Wenruo * data extents. 560c891389SQu Wenruo * There will be only one data reloc tree for one data block group. 570c891389SQu Wenruo * 580c891389SQu Wenruo * Reloc tree will be a special snapshot of its source tree, containing 590c891389SQu Wenruo * relocated tree blocks. 600c891389SQu Wenruo * Each tree referring to a tree block in target block group will get its 610c891389SQu Wenruo * reloc tree built. 620c891389SQu Wenruo * 630c891389SQu Wenruo * 2.3 Swap source tree with its corresponding reloc tree 640c891389SQu Wenruo * Each involved tree only refers to new extents after swap. 650c891389SQu Wenruo * 660c891389SQu Wenruo * 3. Cleanup reloc trees and data reloc tree. 670c891389SQu Wenruo * As old extents in the target block group are still referenced by reloc 680c891389SQu Wenruo * trees, we need to clean them up before really freeing the target block 690c891389SQu Wenruo * group. 700c891389SQu Wenruo * 710c891389SQu Wenruo * The main complexity is in steps 2.2 and 2.3. 720c891389SQu Wenruo * 730c891389SQu Wenruo * The entry point of relocation is relocate_block_group() function. 740c891389SQu Wenruo */ 750c891389SQu Wenruo 760647bf56SWang Shilong #define RELOCATION_RESERVED_NODES 256 772a979612SQu Wenruo /* 785d4f98a2SYan Zheng * map address of tree root to tree 795d4f98a2SYan Zheng */ 805d4f98a2SYan Zheng struct mapping_node { 81e9a28dc5SQu Wenruo struct { 825d4f98a2SYan Zheng struct rb_node rb_node; 835d4f98a2SYan Zheng u64 bytenr; 84e9a28dc5SQu Wenruo }; /* Use rb_simle_node for search/insert */ 855d4f98a2SYan Zheng void *data; 865d4f98a2SYan Zheng }; 875d4f98a2SYan Zheng 885d4f98a2SYan Zheng struct mapping_tree { 895d4f98a2SYan Zheng struct rb_root rb_root; 905d4f98a2SYan Zheng spinlock_t lock; 915d4f98a2SYan Zheng }; 925d4f98a2SYan Zheng 935d4f98a2SYan Zheng /* 945d4f98a2SYan Zheng * present a tree block to process 955d4f98a2SYan Zheng */ 965d4f98a2SYan Zheng struct tree_block { 97e9a28dc5SQu Wenruo struct { 985d4f98a2SYan Zheng struct rb_node rb_node; 995d4f98a2SYan Zheng u64 bytenr; 100e9a28dc5SQu Wenruo }; /* Use rb_simple_node for search/insert */ 1015d4f98a2SYan Zheng struct btrfs_key key; 1025d4f98a2SYan Zheng unsigned int level:8; 1035d4f98a2SYan Zheng unsigned int key_ready:1; 1045d4f98a2SYan Zheng }; 1055d4f98a2SYan Zheng 1060257bb82SYan, Zheng #define MAX_EXTENTS 128 1070257bb82SYan, Zheng 1080257bb82SYan, Zheng struct file_extent_cluster { 1090257bb82SYan, Zheng u64 start; 1100257bb82SYan, Zheng u64 end; 1110257bb82SYan, Zheng u64 boundary[MAX_EXTENTS]; 1120257bb82SYan, Zheng unsigned int nr; 1130257bb82SYan, Zheng }; 1140257bb82SYan, Zheng 1155d4f98a2SYan Zheng struct reloc_control { 1165d4f98a2SYan Zheng /* block group to relocate */ 11732da5386SDavid Sterba struct btrfs_block_group *block_group; 1185d4f98a2SYan Zheng /* extent tree */ 1195d4f98a2SYan Zheng struct btrfs_root *extent_root; 1205d4f98a2SYan Zheng /* inode for moving data */ 1215d4f98a2SYan Zheng struct inode *data_inode; 1223fd0a558SYan, Zheng 1233fd0a558SYan, Zheng struct btrfs_block_rsv *block_rsv; 1243fd0a558SYan, Zheng 125a26195a5SQu Wenruo struct btrfs_backref_cache backref_cache; 1263fd0a558SYan, Zheng 1273fd0a558SYan, Zheng struct file_extent_cluster cluster; 1285d4f98a2SYan Zheng /* tree blocks have been processed */ 1295d4f98a2SYan Zheng struct extent_io_tree processed_blocks; 1305d4f98a2SYan Zheng /* map start of tree root to corresponding reloc tree */ 1315d4f98a2SYan Zheng struct mapping_tree reloc_root_tree; 1325d4f98a2SYan Zheng /* list of reloc trees */ 1335d4f98a2SYan Zheng struct list_head reloc_roots; 134d2311e69SQu Wenruo /* list of subvolume trees that get relocated */ 135d2311e69SQu Wenruo struct list_head dirty_subvol_roots; 1363fd0a558SYan, Zheng /* size of metadata reservation for merging reloc trees */ 1373fd0a558SYan, Zheng u64 merging_rsv_size; 1383fd0a558SYan, Zheng /* size of relocated tree nodes */ 1393fd0a558SYan, Zheng u64 nodes_relocated; 1400647bf56SWang Shilong /* reserved size for block group relocation*/ 1410647bf56SWang Shilong u64 reserved_bytes; 1423fd0a558SYan, Zheng 1435d4f98a2SYan Zheng u64 search_start; 1445d4f98a2SYan Zheng u64 extents_found; 1453fd0a558SYan, Zheng 1463fd0a558SYan, Zheng unsigned int stage:8; 1473fd0a558SYan, Zheng unsigned int create_reloc_tree:1; 1483fd0a558SYan, Zheng unsigned int merge_reloc_tree:1; 1495d4f98a2SYan Zheng unsigned int found_file_extent:1; 1505d4f98a2SYan Zheng }; 1515d4f98a2SYan Zheng 1525d4f98a2SYan Zheng /* stages of data relocation */ 1535d4f98a2SYan Zheng #define MOVE_DATA_EXTENTS 0 1545d4f98a2SYan Zheng #define UPDATE_DATA_PTRS 1 1555d4f98a2SYan Zheng 1569569cc20SQu Wenruo static void mark_block_processed(struct reloc_control *rc, 157a26195a5SQu Wenruo struct btrfs_backref_node *node) 1589569cc20SQu Wenruo { 1599569cc20SQu Wenruo u32 blocksize; 1609569cc20SQu Wenruo 1619569cc20SQu Wenruo if (node->level == 0 || 1629569cc20SQu Wenruo in_range(node->bytenr, rc->block_group->start, 1639569cc20SQu Wenruo rc->block_group->length)) { 1649569cc20SQu Wenruo blocksize = rc->extent_root->fs_info->nodesize; 1659569cc20SQu Wenruo set_extent_bits(&rc->processed_blocks, node->bytenr, 1669569cc20SQu Wenruo node->bytenr + blocksize - 1, EXTENT_DIRTY); 1679569cc20SQu Wenruo } 1689569cc20SQu Wenruo node->processed = 1; 1699569cc20SQu Wenruo } 1709569cc20SQu Wenruo 1715d4f98a2SYan Zheng 1725d4f98a2SYan Zheng static void mapping_tree_init(struct mapping_tree *tree) 1735d4f98a2SYan Zheng { 1746bef4d31SEric Paris tree->rb_root = RB_ROOT; 1755d4f98a2SYan Zheng spin_lock_init(&tree->lock); 1765d4f98a2SYan Zheng } 1775d4f98a2SYan Zheng 1785d4f98a2SYan Zheng /* 1795d4f98a2SYan Zheng * walk up backref nodes until reach node presents tree root 1805d4f98a2SYan Zheng */ 181a26195a5SQu Wenruo static struct btrfs_backref_node *walk_up_backref( 182a26195a5SQu Wenruo struct btrfs_backref_node *node, 183a26195a5SQu Wenruo struct btrfs_backref_edge *edges[], int *index) 1845d4f98a2SYan Zheng { 185a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 1865d4f98a2SYan Zheng int idx = *index; 1875d4f98a2SYan Zheng 1885d4f98a2SYan Zheng while (!list_empty(&node->upper)) { 1895d4f98a2SYan Zheng edge = list_entry(node->upper.next, 190a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 1915d4f98a2SYan Zheng edges[idx++] = edge; 1925d4f98a2SYan Zheng node = edge->node[UPPER]; 1935d4f98a2SYan Zheng } 1943fd0a558SYan, Zheng BUG_ON(node->detached); 1955d4f98a2SYan Zheng *index = idx; 1965d4f98a2SYan Zheng return node; 1975d4f98a2SYan Zheng } 1985d4f98a2SYan Zheng 1995d4f98a2SYan Zheng /* 2005d4f98a2SYan Zheng * walk down backref nodes to find start of next reference path 2015d4f98a2SYan Zheng */ 202a26195a5SQu Wenruo static struct btrfs_backref_node *walk_down_backref( 203a26195a5SQu Wenruo struct btrfs_backref_edge *edges[], int *index) 2045d4f98a2SYan Zheng { 205a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 206a26195a5SQu Wenruo struct btrfs_backref_node *lower; 2075d4f98a2SYan Zheng int idx = *index; 2085d4f98a2SYan Zheng 2095d4f98a2SYan Zheng while (idx > 0) { 2105d4f98a2SYan Zheng edge = edges[idx - 1]; 2115d4f98a2SYan Zheng lower = edge->node[LOWER]; 2125d4f98a2SYan Zheng if (list_is_last(&edge->list[LOWER], &lower->upper)) { 2135d4f98a2SYan Zheng idx--; 2145d4f98a2SYan Zheng continue; 2155d4f98a2SYan Zheng } 2165d4f98a2SYan Zheng edge = list_entry(edge->list[LOWER].next, 217a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 2185d4f98a2SYan Zheng edges[idx - 1] = edge; 2195d4f98a2SYan Zheng *index = idx; 2205d4f98a2SYan Zheng return edge->node[UPPER]; 2215d4f98a2SYan Zheng } 2225d4f98a2SYan Zheng *index = 0; 2235d4f98a2SYan Zheng return NULL; 2245d4f98a2SYan Zheng } 2255d4f98a2SYan Zheng 226a26195a5SQu Wenruo static void update_backref_node(struct btrfs_backref_cache *cache, 227a26195a5SQu Wenruo struct btrfs_backref_node *node, u64 bytenr) 2283fd0a558SYan, Zheng { 2293fd0a558SYan, Zheng struct rb_node *rb_node; 2303fd0a558SYan, Zheng rb_erase(&node->rb_node, &cache->rb_root); 2313fd0a558SYan, Zheng node->bytenr = bytenr; 232e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&cache->rb_root, node->bytenr, &node->rb_node); 23343c04fb1SJeff Mahoney if (rb_node) 234982c92cbSQu Wenruo btrfs_backref_panic(cache->fs_info, bytenr, -EEXIST); 2353fd0a558SYan, Zheng } 2363fd0a558SYan, Zheng 2373fd0a558SYan, Zheng /* 2383fd0a558SYan, Zheng * update backref cache after a transaction commit 2393fd0a558SYan, Zheng */ 2403fd0a558SYan, Zheng static int update_backref_cache(struct btrfs_trans_handle *trans, 241a26195a5SQu Wenruo struct btrfs_backref_cache *cache) 2423fd0a558SYan, Zheng { 243a26195a5SQu Wenruo struct btrfs_backref_node *node; 2443fd0a558SYan, Zheng int level = 0; 2453fd0a558SYan, Zheng 2463fd0a558SYan, Zheng if (cache->last_trans == 0) { 2473fd0a558SYan, Zheng cache->last_trans = trans->transid; 2483fd0a558SYan, Zheng return 0; 2493fd0a558SYan, Zheng } 2503fd0a558SYan, Zheng 2513fd0a558SYan, Zheng if (cache->last_trans == trans->transid) 2523fd0a558SYan, Zheng return 0; 2533fd0a558SYan, Zheng 2543fd0a558SYan, Zheng /* 2553fd0a558SYan, Zheng * detached nodes are used to avoid unnecessary backref 2563fd0a558SYan, Zheng * lookup. transaction commit changes the extent tree. 2573fd0a558SYan, Zheng * so the detached nodes are no longer useful. 2583fd0a558SYan, Zheng */ 2593fd0a558SYan, Zheng while (!list_empty(&cache->detached)) { 2603fd0a558SYan, Zheng node = list_entry(cache->detached.next, 261a26195a5SQu Wenruo struct btrfs_backref_node, list); 262023acb07SQu Wenruo btrfs_backref_cleanup_node(cache, node); 2633fd0a558SYan, Zheng } 2643fd0a558SYan, Zheng 2653fd0a558SYan, Zheng while (!list_empty(&cache->changed)) { 2663fd0a558SYan, Zheng node = list_entry(cache->changed.next, 267a26195a5SQu Wenruo struct btrfs_backref_node, list); 2683fd0a558SYan, Zheng list_del_init(&node->list); 2693fd0a558SYan, Zheng BUG_ON(node->pending); 2703fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 2713fd0a558SYan, Zheng } 2723fd0a558SYan, Zheng 2733fd0a558SYan, Zheng /* 2743fd0a558SYan, Zheng * some nodes can be left in the pending list if there were 2753fd0a558SYan, Zheng * errors during processing the pending nodes. 2763fd0a558SYan, Zheng */ 2773fd0a558SYan, Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 2783fd0a558SYan, Zheng list_for_each_entry(node, &cache->pending[level], list) { 2793fd0a558SYan, Zheng BUG_ON(!node->pending); 2803fd0a558SYan, Zheng if (node->bytenr == node->new_bytenr) 2813fd0a558SYan, Zheng continue; 2823fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 2833fd0a558SYan, Zheng } 2843fd0a558SYan, Zheng } 2853fd0a558SYan, Zheng 2863fd0a558SYan, Zheng cache->last_trans = 0; 2873fd0a558SYan, Zheng return 1; 2883fd0a558SYan, Zheng } 2893fd0a558SYan, Zheng 2906282675eSQu Wenruo static bool reloc_root_is_dead(struct btrfs_root *root) 2916282675eSQu Wenruo { 2926282675eSQu Wenruo /* 2936282675eSQu Wenruo * Pair with set_bit/clear_bit in clean_dirty_subvols and 2946282675eSQu Wenruo * btrfs_update_reloc_root. We need to see the updated bit before 2956282675eSQu Wenruo * trying to access reloc_root 2966282675eSQu Wenruo */ 2976282675eSQu Wenruo smp_rmb(); 2986282675eSQu Wenruo if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state)) 2996282675eSQu Wenruo return true; 3006282675eSQu Wenruo return false; 3016282675eSQu Wenruo } 3026282675eSQu Wenruo 3036282675eSQu Wenruo /* 3046282675eSQu Wenruo * Check if this subvolume tree has valid reloc tree. 3056282675eSQu Wenruo * 3066282675eSQu Wenruo * Reloc tree after swap is considered dead, thus not considered as valid. 3076282675eSQu Wenruo * This is enough for most callers, as they don't distinguish dead reloc root 30855465730SQu Wenruo * from no reloc root. But btrfs_should_ignore_reloc_root() below is a 30955465730SQu Wenruo * special case. 3106282675eSQu Wenruo */ 3116282675eSQu Wenruo static bool have_reloc_root(struct btrfs_root *root) 3126282675eSQu Wenruo { 3136282675eSQu Wenruo if (reloc_root_is_dead(root)) 3146282675eSQu Wenruo return false; 3156282675eSQu Wenruo if (!root->reloc_root) 3166282675eSQu Wenruo return false; 3176282675eSQu Wenruo return true; 3186282675eSQu Wenruo } 319f2a97a9dSDavid Sterba 32055465730SQu Wenruo int btrfs_should_ignore_reloc_root(struct btrfs_root *root) 3213fd0a558SYan, Zheng { 3223fd0a558SYan, Zheng struct btrfs_root *reloc_root; 3233fd0a558SYan, Zheng 32492a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 3253fd0a558SYan, Zheng return 0; 3263fd0a558SYan, Zheng 3276282675eSQu Wenruo /* This root has been merged with its reloc tree, we can ignore it */ 3286282675eSQu Wenruo if (reloc_root_is_dead(root)) 3296282675eSQu Wenruo return 1; 3306282675eSQu Wenruo 3313fd0a558SYan, Zheng reloc_root = root->reloc_root; 3323fd0a558SYan, Zheng if (!reloc_root) 3333fd0a558SYan, Zheng return 0; 3343fd0a558SYan, Zheng 3354d4225fcSJosef Bacik if (btrfs_header_generation(reloc_root->commit_root) == 3364d4225fcSJosef Bacik root->fs_info->running_transaction->transid) 3373fd0a558SYan, Zheng return 0; 3383fd0a558SYan, Zheng /* 3393fd0a558SYan, Zheng * if there is reloc tree and it was created in previous 3403fd0a558SYan, Zheng * transaction backref lookup can find the reloc tree, 3413fd0a558SYan, Zheng * so backref node for the fs tree root is useless for 3423fd0a558SYan, Zheng * relocation. 3433fd0a558SYan, Zheng */ 3443fd0a558SYan, Zheng return 1; 3453fd0a558SYan, Zheng } 34655465730SQu Wenruo 3475d4f98a2SYan Zheng /* 3485d4f98a2SYan Zheng * find reloc tree by address of tree root 3495d4f98a2SYan Zheng */ 3502433bea5SQu Wenruo struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info, u64 bytenr) 3515d4f98a2SYan Zheng { 3522433bea5SQu Wenruo struct reloc_control *rc = fs_info->reloc_ctl; 3535d4f98a2SYan Zheng struct rb_node *rb_node; 3545d4f98a2SYan Zheng struct mapping_node *node; 3555d4f98a2SYan Zheng struct btrfs_root *root = NULL; 3565d4f98a2SYan Zheng 3572433bea5SQu Wenruo ASSERT(rc); 3585d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 359e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, bytenr); 3605d4f98a2SYan Zheng if (rb_node) { 3615d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 3625d4f98a2SYan Zheng root = (struct btrfs_root *)node->data; 3635d4f98a2SYan Zheng } 3645d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 36500246528SJosef Bacik return btrfs_grab_root(root); 3665d4f98a2SYan Zheng } 3675d4f98a2SYan Zheng 3685d4f98a2SYan Zheng /* 36929db137bSQu Wenruo * For useless nodes, do two major clean ups: 37029db137bSQu Wenruo * 37129db137bSQu Wenruo * - Cleanup the children edges and nodes 37229db137bSQu Wenruo * If child node is also orphan (no parent) during cleanup, then the child 37329db137bSQu Wenruo * node will also be cleaned up. 37429db137bSQu Wenruo * 37529db137bSQu Wenruo * - Freeing up leaves (level 0), keeps nodes detached 37629db137bSQu Wenruo * For nodes, the node is still cached as "detached" 37729db137bSQu Wenruo * 37829db137bSQu Wenruo * Return false if @node is not in the @useless_nodes list. 37929db137bSQu Wenruo * Return true if @node is in the @useless_nodes list. 38029db137bSQu Wenruo */ 38129db137bSQu Wenruo static bool handle_useless_nodes(struct reloc_control *rc, 382a26195a5SQu Wenruo struct btrfs_backref_node *node) 38329db137bSQu Wenruo { 384a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 38529db137bSQu Wenruo struct list_head *useless_node = &cache->useless_node; 38629db137bSQu Wenruo bool ret = false; 38729db137bSQu Wenruo 38829db137bSQu Wenruo while (!list_empty(useless_node)) { 389a26195a5SQu Wenruo struct btrfs_backref_node *cur; 39029db137bSQu Wenruo 391a26195a5SQu Wenruo cur = list_first_entry(useless_node, struct btrfs_backref_node, 39229db137bSQu Wenruo list); 39329db137bSQu Wenruo list_del_init(&cur->list); 39429db137bSQu Wenruo 39529db137bSQu Wenruo /* Only tree root nodes can be added to @useless_nodes */ 39629db137bSQu Wenruo ASSERT(list_empty(&cur->upper)); 39729db137bSQu Wenruo 39829db137bSQu Wenruo if (cur == node) 39929db137bSQu Wenruo ret = true; 40029db137bSQu Wenruo 40129db137bSQu Wenruo /* The node is the lowest node */ 40229db137bSQu Wenruo if (cur->lowest) { 40329db137bSQu Wenruo list_del_init(&cur->lower); 40429db137bSQu Wenruo cur->lowest = 0; 40529db137bSQu Wenruo } 40629db137bSQu Wenruo 40729db137bSQu Wenruo /* Cleanup the lower edges */ 40829db137bSQu Wenruo while (!list_empty(&cur->lower)) { 409a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 410a26195a5SQu Wenruo struct btrfs_backref_node *lower; 41129db137bSQu Wenruo 41229db137bSQu Wenruo edge = list_entry(cur->lower.next, 413a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 41429db137bSQu Wenruo list_del(&edge->list[UPPER]); 41529db137bSQu Wenruo list_del(&edge->list[LOWER]); 41629db137bSQu Wenruo lower = edge->node[LOWER]; 417741188d3SQu Wenruo btrfs_backref_free_edge(cache, edge); 41829db137bSQu Wenruo 41929db137bSQu Wenruo /* Child node is also orphan, queue for cleanup */ 42029db137bSQu Wenruo if (list_empty(&lower->upper)) 42129db137bSQu Wenruo list_add(&lower->list, useless_node); 42229db137bSQu Wenruo } 42329db137bSQu Wenruo /* Mark this block processed for relocation */ 42429db137bSQu Wenruo mark_block_processed(rc, cur); 42529db137bSQu Wenruo 42629db137bSQu Wenruo /* 42729db137bSQu Wenruo * Backref nodes for tree leaves are deleted from the cache. 42829db137bSQu Wenruo * Backref nodes for upper level tree blocks are left in the 42929db137bSQu Wenruo * cache to avoid unnecessary backref lookup. 43029db137bSQu Wenruo */ 43129db137bSQu Wenruo if (cur->level > 0) { 43229db137bSQu Wenruo list_add(&cur->list, &cache->detached); 43329db137bSQu Wenruo cur->detached = 1; 43429db137bSQu Wenruo } else { 43529db137bSQu Wenruo rb_erase(&cur->rb_node, &cache->rb_root); 436741188d3SQu Wenruo btrfs_backref_free_node(cache, cur); 43729db137bSQu Wenruo } 43829db137bSQu Wenruo } 43929db137bSQu Wenruo return ret; 44029db137bSQu Wenruo } 44129db137bSQu Wenruo 44229db137bSQu Wenruo /* 443e7d571c7SQu Wenruo * Build backref tree for a given tree block. Root of the backref tree 444e7d571c7SQu Wenruo * corresponds the tree block, leaves of the backref tree correspond roots of 445e7d571c7SQu Wenruo * b-trees that reference the tree block. 446e7d571c7SQu Wenruo * 447e7d571c7SQu Wenruo * The basic idea of this function is check backrefs of a given block to find 448e7d571c7SQu Wenruo * upper level blocks that reference the block, and then check backrefs of 449e7d571c7SQu Wenruo * these upper level blocks recursively. The recursion stops when tree root is 450e7d571c7SQu Wenruo * reached or backrefs for the block is cached. 451e7d571c7SQu Wenruo * 452e7d571c7SQu Wenruo * NOTE: if we find that backrefs for a block are cached, we know backrefs for 453e7d571c7SQu Wenruo * all upper level blocks that directly/indirectly reference the block are also 454e7d571c7SQu Wenruo * cached. 455e7d571c7SQu Wenruo */ 456a26195a5SQu Wenruo static noinline_for_stack struct btrfs_backref_node *build_backref_tree( 457e7d571c7SQu Wenruo struct reloc_control *rc, struct btrfs_key *node_key, 458e7d571c7SQu Wenruo int level, u64 bytenr) 459e7d571c7SQu Wenruo { 460e7d571c7SQu Wenruo struct btrfs_backref_iter *iter; 461a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 462e7d571c7SQu Wenruo /* For searching parent of TREE_BLOCK_REF */ 463e7d571c7SQu Wenruo struct btrfs_path *path; 464a26195a5SQu Wenruo struct btrfs_backref_node *cur; 465a26195a5SQu Wenruo struct btrfs_backref_node *node = NULL; 466a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 467e7d571c7SQu Wenruo int ret; 468e7d571c7SQu Wenruo int err = 0; 469e7d571c7SQu Wenruo 470e7d571c7SQu Wenruo iter = btrfs_backref_iter_alloc(rc->extent_root->fs_info, GFP_NOFS); 471e7d571c7SQu Wenruo if (!iter) 472e7d571c7SQu Wenruo return ERR_PTR(-ENOMEM); 473e7d571c7SQu Wenruo path = btrfs_alloc_path(); 474e7d571c7SQu Wenruo if (!path) { 475e7d571c7SQu Wenruo err = -ENOMEM; 476e7d571c7SQu Wenruo goto out; 477e7d571c7SQu Wenruo } 478e7d571c7SQu Wenruo 479b1818dabSQu Wenruo node = btrfs_backref_alloc_node(cache, bytenr, level); 480e7d571c7SQu Wenruo if (!node) { 481e7d571c7SQu Wenruo err = -ENOMEM; 482e7d571c7SQu Wenruo goto out; 483e7d571c7SQu Wenruo } 484e7d571c7SQu Wenruo 485e7d571c7SQu Wenruo node->lowest = 1; 486e7d571c7SQu Wenruo cur = node; 487e7d571c7SQu Wenruo 488e7d571c7SQu Wenruo /* Breadth-first search to build backref cache */ 489e7d571c7SQu Wenruo do { 4901b60d2ecSQu Wenruo ret = btrfs_backref_add_tree_node(cache, path, iter, node_key, 4911b60d2ecSQu Wenruo cur); 492e7d571c7SQu Wenruo if (ret < 0) { 493e7d571c7SQu Wenruo err = ret; 494e7d571c7SQu Wenruo goto out; 495e7d571c7SQu Wenruo } 496e7d571c7SQu Wenruo edge = list_first_entry_or_null(&cache->pending_edge, 497a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 498e7d571c7SQu Wenruo /* 499e7d571c7SQu Wenruo * The pending list isn't empty, take the first block to 500e7d571c7SQu Wenruo * process 501e7d571c7SQu Wenruo */ 502e7d571c7SQu Wenruo if (edge) { 5035d4f98a2SYan Zheng list_del_init(&edge->list[UPPER]); 5045d4f98a2SYan Zheng cur = edge->node[UPPER]; 5055d4f98a2SYan Zheng } 506e7d571c7SQu Wenruo } while (edge); 5075d4f98a2SYan Zheng 5081f872924SQu Wenruo /* Finish the upper linkage of newly added edges/nodes */ 509fc997ed0SQu Wenruo ret = btrfs_backref_finish_upper_links(cache, node); 5101f872924SQu Wenruo if (ret < 0) { 5111f872924SQu Wenruo err = ret; 51275bfb9afSJosef Bacik goto out; 51375bfb9afSJosef Bacik } 51475bfb9afSJosef Bacik 51529db137bSQu Wenruo if (handle_useless_nodes(rc, node)) 5163fd0a558SYan, Zheng node = NULL; 5175d4f98a2SYan Zheng out: 51871f572a9SQu Wenruo btrfs_backref_iter_free(iter); 51971f572a9SQu Wenruo btrfs_free_path(path); 5205d4f98a2SYan Zheng if (err) { 5211b23ea18SQu Wenruo btrfs_backref_error_cleanup(cache, node); 5225d4f98a2SYan Zheng return ERR_PTR(err); 5235d4f98a2SYan Zheng } 52475bfb9afSJosef Bacik ASSERT(!node || !node->detached); 52584780289SQu Wenruo ASSERT(list_empty(&cache->useless_node) && 52684780289SQu Wenruo list_empty(&cache->pending_edge)); 5275d4f98a2SYan Zheng return node; 5285d4f98a2SYan Zheng } 5295d4f98a2SYan Zheng 5305d4f98a2SYan Zheng /* 5313fd0a558SYan, Zheng * helper to add backref node for the newly created snapshot. 5323fd0a558SYan, Zheng * the backref node is created by cloning backref node that 5333fd0a558SYan, Zheng * corresponds to root of source tree 5343fd0a558SYan, Zheng */ 5353fd0a558SYan, Zheng static int clone_backref_node(struct btrfs_trans_handle *trans, 5363fd0a558SYan, Zheng struct reloc_control *rc, 5373fd0a558SYan, Zheng struct btrfs_root *src, 5383fd0a558SYan, Zheng struct btrfs_root *dest) 5393fd0a558SYan, Zheng { 5403fd0a558SYan, Zheng struct btrfs_root *reloc_root = src->reloc_root; 541a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 542a26195a5SQu Wenruo struct btrfs_backref_node *node = NULL; 543a26195a5SQu Wenruo struct btrfs_backref_node *new_node; 544a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 545a26195a5SQu Wenruo struct btrfs_backref_edge *new_edge; 5463fd0a558SYan, Zheng struct rb_node *rb_node; 5473fd0a558SYan, Zheng 5483fd0a558SYan, Zheng if (cache->last_trans > 0) 5493fd0a558SYan, Zheng update_backref_cache(trans, cache); 5503fd0a558SYan, Zheng 551e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, src->commit_root->start); 5523fd0a558SYan, Zheng if (rb_node) { 553a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, rb_node); 5543fd0a558SYan, Zheng if (node->detached) 5553fd0a558SYan, Zheng node = NULL; 5563fd0a558SYan, Zheng else 5573fd0a558SYan, Zheng BUG_ON(node->new_bytenr != reloc_root->node->start); 5583fd0a558SYan, Zheng } 5593fd0a558SYan, Zheng 5603fd0a558SYan, Zheng if (!node) { 561e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, 5623fd0a558SYan, Zheng reloc_root->commit_root->start); 5633fd0a558SYan, Zheng if (rb_node) { 564a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, 5653fd0a558SYan, Zheng rb_node); 5663fd0a558SYan, Zheng BUG_ON(node->detached); 5673fd0a558SYan, Zheng } 5683fd0a558SYan, Zheng } 5693fd0a558SYan, Zheng 5703fd0a558SYan, Zheng if (!node) 5713fd0a558SYan, Zheng return 0; 5723fd0a558SYan, Zheng 573b1818dabSQu Wenruo new_node = btrfs_backref_alloc_node(cache, dest->node->start, 574b1818dabSQu Wenruo node->level); 5753fd0a558SYan, Zheng if (!new_node) 5763fd0a558SYan, Zheng return -ENOMEM; 5773fd0a558SYan, Zheng 5783fd0a558SYan, Zheng new_node->lowest = node->lowest; 5796848ad64SYan, Zheng new_node->checked = 1; 58000246528SJosef Bacik new_node->root = btrfs_grab_root(dest); 5810b530bc5SJosef Bacik ASSERT(new_node->root); 5823fd0a558SYan, Zheng 5833fd0a558SYan, Zheng if (!node->lowest) { 5843fd0a558SYan, Zheng list_for_each_entry(edge, &node->lower, list[UPPER]) { 58547254d07SQu Wenruo new_edge = btrfs_backref_alloc_edge(cache); 5863fd0a558SYan, Zheng if (!new_edge) 5873fd0a558SYan, Zheng goto fail; 5883fd0a558SYan, Zheng 589f39911e5SQu Wenruo btrfs_backref_link_edge(new_edge, edge->node[LOWER], 590f39911e5SQu Wenruo new_node, LINK_UPPER); 5913fd0a558SYan, Zheng } 59276b9e23dSMiao Xie } else { 59376b9e23dSMiao Xie list_add_tail(&new_node->lower, &cache->leaves); 5943fd0a558SYan, Zheng } 5953fd0a558SYan, Zheng 596e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&cache->rb_root, new_node->bytenr, 5973fd0a558SYan, Zheng &new_node->rb_node); 59843c04fb1SJeff Mahoney if (rb_node) 599982c92cbSQu Wenruo btrfs_backref_panic(trans->fs_info, new_node->bytenr, -EEXIST); 6003fd0a558SYan, Zheng 6013fd0a558SYan, Zheng if (!new_node->lowest) { 6023fd0a558SYan, Zheng list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { 6033fd0a558SYan, Zheng list_add_tail(&new_edge->list[LOWER], 6043fd0a558SYan, Zheng &new_edge->node[LOWER]->upper); 6053fd0a558SYan, Zheng } 6063fd0a558SYan, Zheng } 6073fd0a558SYan, Zheng return 0; 6083fd0a558SYan, Zheng fail: 6093fd0a558SYan, Zheng while (!list_empty(&new_node->lower)) { 6103fd0a558SYan, Zheng new_edge = list_entry(new_node->lower.next, 611a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 6123fd0a558SYan, Zheng list_del(&new_edge->list[UPPER]); 613741188d3SQu Wenruo btrfs_backref_free_edge(cache, new_edge); 6143fd0a558SYan, Zheng } 615741188d3SQu Wenruo btrfs_backref_free_node(cache, new_node); 6163fd0a558SYan, Zheng return -ENOMEM; 6173fd0a558SYan, Zheng } 6183fd0a558SYan, Zheng 6193fd0a558SYan, Zheng /* 6205d4f98a2SYan Zheng * helper to add 'address of tree root -> reloc tree' mapping 6215d4f98a2SYan Zheng */ 622ffd7b339SJeff Mahoney static int __must_check __add_reloc_root(struct btrfs_root *root) 6235d4f98a2SYan Zheng { 6240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 6255d4f98a2SYan Zheng struct rb_node *rb_node; 6265d4f98a2SYan Zheng struct mapping_node *node; 6270b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 6285d4f98a2SYan Zheng 6295d4f98a2SYan Zheng node = kmalloc(sizeof(*node), GFP_NOFS); 630ffd7b339SJeff Mahoney if (!node) 631ffd7b339SJeff Mahoney return -ENOMEM; 6325d4f98a2SYan Zheng 633ea287ab1SJosef Bacik node->bytenr = root->commit_root->start; 6345d4f98a2SYan Zheng node->data = root; 6355d4f98a2SYan Zheng 6365d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 637e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 6385d4f98a2SYan Zheng node->bytenr, &node->rb_node); 6395d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 640ffd7b339SJeff Mahoney if (rb_node) { 6410b246afaSJeff Mahoney btrfs_panic(fs_info, -EEXIST, 6425d163e0eSJeff Mahoney "Duplicate root found for start=%llu while inserting into relocation tree", 6435d163e0eSJeff Mahoney node->bytenr); 644ffd7b339SJeff Mahoney } 6455d4f98a2SYan Zheng 6465d4f98a2SYan Zheng list_add_tail(&root->root_list, &rc->reloc_roots); 6475d4f98a2SYan Zheng return 0; 6485d4f98a2SYan Zheng } 6495d4f98a2SYan Zheng 6505d4f98a2SYan Zheng /* 651c974c464SWang Shilong * helper to delete the 'address of tree root -> reloc tree' 6525d4f98a2SYan Zheng * mapping 6535d4f98a2SYan Zheng */ 654c974c464SWang Shilong static void __del_reloc_root(struct btrfs_root *root) 6555d4f98a2SYan Zheng { 6560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 6575d4f98a2SYan Zheng struct rb_node *rb_node; 6585d4f98a2SYan Zheng struct mapping_node *node = NULL; 6590b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 660f44deb74SJosef Bacik bool put_ref = false; 6615d4f98a2SYan Zheng 66265c6e82bSQu Wenruo if (rc && root->node) { 6635d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 664e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 665ea287ab1SJosef Bacik root->commit_root->start); 666c974c464SWang Shilong if (rb_node) { 667c974c464SWang Shilong node = rb_entry(rb_node, struct mapping_node, rb_node); 668c974c464SWang Shilong rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 669ea287ab1SJosef Bacik RB_CLEAR_NODE(&node->rb_node); 670c974c464SWang Shilong } 671c974c464SWang Shilong spin_unlock(&rc->reloc_root_tree.lock); 672c974c464SWang Shilong if (!node) 673c974c464SWang Shilong return; 674c974c464SWang Shilong BUG_ON((struct btrfs_root *)node->data != root); 675389305b2SQu Wenruo } 676c974c464SWang Shilong 677f44deb74SJosef Bacik /* 678f44deb74SJosef Bacik * We only put the reloc root here if it's on the list. There's a lot 679f44deb74SJosef Bacik * of places where the pattern is to splice the rc->reloc_roots, process 680f44deb74SJosef Bacik * the reloc roots, and then add the reloc root back onto 681f44deb74SJosef Bacik * rc->reloc_roots. If we call __del_reloc_root while it's off of the 682f44deb74SJosef Bacik * list we don't want the reference being dropped, because the guy 683f44deb74SJosef Bacik * messing with the list is in charge of the reference. 684f44deb74SJosef Bacik */ 6850b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 686f44deb74SJosef Bacik if (!list_empty(&root->root_list)) { 687f44deb74SJosef Bacik put_ref = true; 688c974c464SWang Shilong list_del_init(&root->root_list); 689f44deb74SJosef Bacik } 6900b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 691f44deb74SJosef Bacik if (put_ref) 692f44deb74SJosef Bacik btrfs_put_root(root); 693c974c464SWang Shilong kfree(node); 694c974c464SWang Shilong } 695c974c464SWang Shilong 696c974c464SWang Shilong /* 697c974c464SWang Shilong * helper to update the 'address of tree root -> reloc tree' 698c974c464SWang Shilong * mapping 699c974c464SWang Shilong */ 700ea287ab1SJosef Bacik static int __update_reloc_root(struct btrfs_root *root) 701c974c464SWang Shilong { 7020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 703c974c464SWang Shilong struct rb_node *rb_node; 704c974c464SWang Shilong struct mapping_node *node = NULL; 7050b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 706c974c464SWang Shilong 707c974c464SWang Shilong spin_lock(&rc->reloc_root_tree.lock); 708e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 709ea287ab1SJosef Bacik root->commit_root->start); 7105d4f98a2SYan Zheng if (rb_node) { 7115d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 7125d4f98a2SYan Zheng rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 7135d4f98a2SYan Zheng } 7145d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 7155d4f98a2SYan Zheng 7168f71f3e0SLiu Bo if (!node) 7178f71f3e0SLiu Bo return 0; 7185d4f98a2SYan Zheng BUG_ON((struct btrfs_root *)node->data != root); 7195d4f98a2SYan Zheng 7205d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 721ea287ab1SJosef Bacik node->bytenr = root->node->start; 722e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 7235d4f98a2SYan Zheng node->bytenr, &node->rb_node); 7245d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 72543c04fb1SJeff Mahoney if (rb_node) 726982c92cbSQu Wenruo btrfs_backref_panic(fs_info, node->bytenr, -EEXIST); 7275d4f98a2SYan Zheng return 0; 7285d4f98a2SYan Zheng } 7295d4f98a2SYan Zheng 7303fd0a558SYan, Zheng static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, 7313fd0a558SYan, Zheng struct btrfs_root *root, u64 objectid) 7325d4f98a2SYan Zheng { 7330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 7345d4f98a2SYan Zheng struct btrfs_root *reloc_root; 7355d4f98a2SYan Zheng struct extent_buffer *eb; 7365d4f98a2SYan Zheng struct btrfs_root_item *root_item; 7375d4f98a2SYan Zheng struct btrfs_key root_key; 7385d4f98a2SYan Zheng int ret; 7395d4f98a2SYan Zheng 7405d4f98a2SYan Zheng root_item = kmalloc(sizeof(*root_item), GFP_NOFS); 7415d4f98a2SYan Zheng BUG_ON(!root_item); 7425d4f98a2SYan Zheng 7435d4f98a2SYan Zheng root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; 7445d4f98a2SYan Zheng root_key.type = BTRFS_ROOT_ITEM_KEY; 7453fd0a558SYan, Zheng root_key.offset = objectid; 7465d4f98a2SYan Zheng 7473fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 748054570a1SFilipe Manana u64 commit_root_gen; 749054570a1SFilipe Manana 7503fd0a558SYan, Zheng /* called by btrfs_init_reloc_root */ 7515d4f98a2SYan Zheng ret = btrfs_copy_root(trans, root, root->commit_root, &eb, 7525d4f98a2SYan Zheng BTRFS_TREE_RELOC_OBJECTID); 7535d4f98a2SYan Zheng BUG_ON(ret); 754054570a1SFilipe Manana /* 755054570a1SFilipe Manana * Set the last_snapshot field to the generation of the commit 756054570a1SFilipe Manana * root - like this ctree.c:btrfs_block_can_be_shared() behaves 757054570a1SFilipe Manana * correctly (returns true) when the relocation root is created 758054570a1SFilipe Manana * either inside the critical section of a transaction commit 759054570a1SFilipe Manana * (through transaction.c:qgroup_account_snapshot()) and when 760054570a1SFilipe Manana * it's created before the transaction commit is started. 761054570a1SFilipe Manana */ 762054570a1SFilipe Manana commit_root_gen = btrfs_header_generation(root->commit_root); 763054570a1SFilipe Manana btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen); 7643fd0a558SYan, Zheng } else { 7653fd0a558SYan, Zheng /* 7663fd0a558SYan, Zheng * called by btrfs_reloc_post_snapshot_hook. 7673fd0a558SYan, Zheng * the source tree is a reloc tree, all tree blocks 7683fd0a558SYan, Zheng * modified after it was created have RELOC flag 7693fd0a558SYan, Zheng * set in their headers. so it's OK to not update 7703fd0a558SYan, Zheng * the 'last_snapshot'. 7713fd0a558SYan, Zheng */ 7723fd0a558SYan, Zheng ret = btrfs_copy_root(trans, root, root->node, &eb, 7733fd0a558SYan, Zheng BTRFS_TREE_RELOC_OBJECTID); 7743fd0a558SYan, Zheng BUG_ON(ret); 7753fd0a558SYan, Zheng } 7763fd0a558SYan, Zheng 7775d4f98a2SYan Zheng memcpy(root_item, &root->root_item, sizeof(*root_item)); 7785d4f98a2SYan Zheng btrfs_set_root_bytenr(root_item, eb->start); 7795d4f98a2SYan Zheng btrfs_set_root_level(root_item, btrfs_header_level(eb)); 7805d4f98a2SYan Zheng btrfs_set_root_generation(root_item, trans->transid); 7813fd0a558SYan, Zheng 7823fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 7833fd0a558SYan, Zheng btrfs_set_root_refs(root_item, 0); 7843fd0a558SYan, Zheng memset(&root_item->drop_progress, 0, 7853fd0a558SYan, Zheng sizeof(struct btrfs_disk_key)); 7865d4f98a2SYan Zheng root_item->drop_level = 0; 7873fd0a558SYan, Zheng } 7885d4f98a2SYan Zheng 7895d4f98a2SYan Zheng btrfs_tree_unlock(eb); 7905d4f98a2SYan Zheng free_extent_buffer(eb); 7915d4f98a2SYan Zheng 7920b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, 7935d4f98a2SYan Zheng &root_key, root_item); 7945d4f98a2SYan Zheng BUG_ON(ret); 7955d4f98a2SYan Zheng kfree(root_item); 7965d4f98a2SYan Zheng 7973dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(fs_info->tree_root, &root_key); 7985d4f98a2SYan Zheng BUG_ON(IS_ERR(reloc_root)); 79992a7cc42SQu Wenruo set_bit(BTRFS_ROOT_SHAREABLE, &reloc_root->state); 8005d4f98a2SYan Zheng reloc_root->last_trans = trans->transid; 8013fd0a558SYan, Zheng return reloc_root; 8023fd0a558SYan, Zheng } 8033fd0a558SYan, Zheng 8043fd0a558SYan, Zheng /* 8053fd0a558SYan, Zheng * create reloc tree for a given fs tree. reloc tree is just a 8063fd0a558SYan, Zheng * snapshot of the fs tree with special root objectid. 807f44deb74SJosef Bacik * 808f44deb74SJosef Bacik * The reloc_root comes out of here with two references, one for 809f44deb74SJosef Bacik * root->reloc_root, and another for being on the rc->reloc_roots list. 8103fd0a558SYan, Zheng */ 8113fd0a558SYan, Zheng int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 8123fd0a558SYan, Zheng struct btrfs_root *root) 8133fd0a558SYan, Zheng { 8140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 8153fd0a558SYan, Zheng struct btrfs_root *reloc_root; 8160b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 81720dd2cbfSMiao Xie struct btrfs_block_rsv *rsv; 8183fd0a558SYan, Zheng int clear_rsv = 0; 819ffd7b339SJeff Mahoney int ret; 8203fd0a558SYan, Zheng 821aec7db3bSJosef Bacik if (!rc) 8222abc726aSJosef Bacik return 0; 8232abc726aSJosef Bacik 8241fac4a54SQu Wenruo /* 8251fac4a54SQu Wenruo * The subvolume has reloc tree but the swap is finished, no need to 8261fac4a54SQu Wenruo * create/update the dead reloc tree 8271fac4a54SQu Wenruo */ 8286282675eSQu Wenruo if (reloc_root_is_dead(root)) 8291fac4a54SQu Wenruo return 0; 8301fac4a54SQu Wenruo 831aec7db3bSJosef Bacik /* 832aec7db3bSJosef Bacik * This is subtle but important. We do not do 833aec7db3bSJosef Bacik * record_root_in_transaction for reloc roots, instead we record their 834aec7db3bSJosef Bacik * corresponding fs root, and then here we update the last trans for the 835aec7db3bSJosef Bacik * reloc root. This means that we have to do this for the entire life 836aec7db3bSJosef Bacik * of the reloc root, regardless of which stage of the relocation we are 837aec7db3bSJosef Bacik * in. 838aec7db3bSJosef Bacik */ 8393fd0a558SYan, Zheng if (root->reloc_root) { 8403fd0a558SYan, Zheng reloc_root = root->reloc_root; 8413fd0a558SYan, Zheng reloc_root->last_trans = trans->transid; 8423fd0a558SYan, Zheng return 0; 8433fd0a558SYan, Zheng } 8443fd0a558SYan, Zheng 845aec7db3bSJosef Bacik /* 846aec7db3bSJosef Bacik * We are merging reloc roots, we do not need new reloc trees. Also 847aec7db3bSJosef Bacik * reloc trees never need their own reloc tree. 848aec7db3bSJosef Bacik */ 849aec7db3bSJosef Bacik if (!rc->create_reloc_tree || 850aec7db3bSJosef Bacik root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 851aec7db3bSJosef Bacik return 0; 852aec7db3bSJosef Bacik 85320dd2cbfSMiao Xie if (!trans->reloc_reserved) { 85420dd2cbfSMiao Xie rsv = trans->block_rsv; 8553fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 8563fd0a558SYan, Zheng clear_rsv = 1; 8573fd0a558SYan, Zheng } 8583fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root, root->root_key.objectid); 8593fd0a558SYan, Zheng if (clear_rsv) 86020dd2cbfSMiao Xie trans->block_rsv = rsv; 8615d4f98a2SYan Zheng 862ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 863ffd7b339SJeff Mahoney BUG_ON(ret < 0); 864f44deb74SJosef Bacik root->reloc_root = btrfs_grab_root(reloc_root); 8655d4f98a2SYan Zheng return 0; 8665d4f98a2SYan Zheng } 8675d4f98a2SYan Zheng 8685d4f98a2SYan Zheng /* 8695d4f98a2SYan Zheng * update root item of reloc tree 8705d4f98a2SYan Zheng */ 8715d4f98a2SYan Zheng int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 8725d4f98a2SYan Zheng struct btrfs_root *root) 8735d4f98a2SYan Zheng { 8740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 8755d4f98a2SYan Zheng struct btrfs_root *reloc_root; 8765d4f98a2SYan Zheng struct btrfs_root_item *root_item; 8775d4f98a2SYan Zheng int ret; 8785d4f98a2SYan Zheng 8796282675eSQu Wenruo if (!have_reloc_root(root)) 8807585717fSChris Mason goto out; 8815d4f98a2SYan Zheng 8825d4f98a2SYan Zheng reloc_root = root->reloc_root; 8835d4f98a2SYan Zheng root_item = &reloc_root->root_item; 8845d4f98a2SYan Zheng 885f44deb74SJosef Bacik /* 886f44deb74SJosef Bacik * We are probably ok here, but __del_reloc_root() will drop its ref of 887f44deb74SJosef Bacik * the root. We have the ref for root->reloc_root, but just in case 888f44deb74SJosef Bacik * hold it while we update the reloc root. 889f44deb74SJosef Bacik */ 890f44deb74SJosef Bacik btrfs_grab_root(reloc_root); 891f44deb74SJosef Bacik 892d2311e69SQu Wenruo /* root->reloc_root will stay until current relocation finished */ 8930b246afaSJeff Mahoney if (fs_info->reloc_ctl->merge_reloc_tree && 8943fd0a558SYan, Zheng btrfs_root_refs(root_item) == 0) { 895d2311e69SQu Wenruo set_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 8966282675eSQu Wenruo /* 8976282675eSQu Wenruo * Mark the tree as dead before we change reloc_root so 8986282675eSQu Wenruo * have_reloc_root will not touch it from now on. 8996282675eSQu Wenruo */ 9006282675eSQu Wenruo smp_wmb(); 901c974c464SWang Shilong __del_reloc_root(reloc_root); 9025d4f98a2SYan Zheng } 9035d4f98a2SYan Zheng 9045d4f98a2SYan Zheng if (reloc_root->commit_root != reloc_root->node) { 905ea287ab1SJosef Bacik __update_reloc_root(reloc_root); 9065d4f98a2SYan Zheng btrfs_set_root_node(root_item, reloc_root->node); 9075d4f98a2SYan Zheng free_extent_buffer(reloc_root->commit_root); 9085d4f98a2SYan Zheng reloc_root->commit_root = btrfs_root_node(reloc_root); 9095d4f98a2SYan Zheng } 9105d4f98a2SYan Zheng 9110b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 9125d4f98a2SYan Zheng &reloc_root->root_key, root_item); 9135d4f98a2SYan Zheng BUG_ON(ret); 914f44deb74SJosef Bacik btrfs_put_root(reloc_root); 9157585717fSChris Mason out: 9165d4f98a2SYan Zheng return 0; 9175d4f98a2SYan Zheng } 9185d4f98a2SYan Zheng 9195d4f98a2SYan Zheng /* 9205d4f98a2SYan Zheng * helper to find first cached inode with inode number >= objectid 9215d4f98a2SYan Zheng * in a subvolume 9225d4f98a2SYan Zheng */ 9235d4f98a2SYan Zheng static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) 9245d4f98a2SYan Zheng { 9255d4f98a2SYan Zheng struct rb_node *node; 9265d4f98a2SYan Zheng struct rb_node *prev; 9275d4f98a2SYan Zheng struct btrfs_inode *entry; 9285d4f98a2SYan Zheng struct inode *inode; 9295d4f98a2SYan Zheng 9305d4f98a2SYan Zheng spin_lock(&root->inode_lock); 9315d4f98a2SYan Zheng again: 9325d4f98a2SYan Zheng node = root->inode_tree.rb_node; 9335d4f98a2SYan Zheng prev = NULL; 9345d4f98a2SYan Zheng while (node) { 9355d4f98a2SYan Zheng prev = node; 9365d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 9375d4f98a2SYan Zheng 9384a0cc7caSNikolay Borisov if (objectid < btrfs_ino(entry)) 9395d4f98a2SYan Zheng node = node->rb_left; 9404a0cc7caSNikolay Borisov else if (objectid > btrfs_ino(entry)) 9415d4f98a2SYan Zheng node = node->rb_right; 9425d4f98a2SYan Zheng else 9435d4f98a2SYan Zheng break; 9445d4f98a2SYan Zheng } 9455d4f98a2SYan Zheng if (!node) { 9465d4f98a2SYan Zheng while (prev) { 9475d4f98a2SYan Zheng entry = rb_entry(prev, struct btrfs_inode, rb_node); 9484a0cc7caSNikolay Borisov if (objectid <= btrfs_ino(entry)) { 9495d4f98a2SYan Zheng node = prev; 9505d4f98a2SYan Zheng break; 9515d4f98a2SYan Zheng } 9525d4f98a2SYan Zheng prev = rb_next(prev); 9535d4f98a2SYan Zheng } 9545d4f98a2SYan Zheng } 9555d4f98a2SYan Zheng while (node) { 9565d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 9575d4f98a2SYan Zheng inode = igrab(&entry->vfs_inode); 9585d4f98a2SYan Zheng if (inode) { 9595d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 9605d4f98a2SYan Zheng return inode; 9615d4f98a2SYan Zheng } 9625d4f98a2SYan Zheng 9634a0cc7caSNikolay Borisov objectid = btrfs_ino(entry) + 1; 9645d4f98a2SYan Zheng if (cond_resched_lock(&root->inode_lock)) 9655d4f98a2SYan Zheng goto again; 9665d4f98a2SYan Zheng 9675d4f98a2SYan Zheng node = rb_next(node); 9685d4f98a2SYan Zheng } 9695d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 9705d4f98a2SYan Zheng return NULL; 9715d4f98a2SYan Zheng } 9725d4f98a2SYan Zheng 9735d4f98a2SYan Zheng /* 9745d4f98a2SYan Zheng * get new location of data 9755d4f98a2SYan Zheng */ 9765d4f98a2SYan Zheng static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, 9775d4f98a2SYan Zheng u64 bytenr, u64 num_bytes) 9785d4f98a2SYan Zheng { 9795d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(reloc_inode)->root; 9805d4f98a2SYan Zheng struct btrfs_path *path; 9815d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 9825d4f98a2SYan Zheng struct extent_buffer *leaf; 9835d4f98a2SYan Zheng int ret; 9845d4f98a2SYan Zheng 9855d4f98a2SYan Zheng path = btrfs_alloc_path(); 9865d4f98a2SYan Zheng if (!path) 9875d4f98a2SYan Zheng return -ENOMEM; 9885d4f98a2SYan Zheng 9895d4f98a2SYan Zheng bytenr -= BTRFS_I(reloc_inode)->index_cnt; 990f85b7379SDavid Sterba ret = btrfs_lookup_file_extent(NULL, root, path, 991f85b7379SDavid Sterba btrfs_ino(BTRFS_I(reloc_inode)), bytenr, 0); 9925d4f98a2SYan Zheng if (ret < 0) 9935d4f98a2SYan Zheng goto out; 9945d4f98a2SYan Zheng if (ret > 0) { 9955d4f98a2SYan Zheng ret = -ENOENT; 9965d4f98a2SYan Zheng goto out; 9975d4f98a2SYan Zheng } 9985d4f98a2SYan Zheng 9995d4f98a2SYan Zheng leaf = path->nodes[0]; 10005d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, path->slots[0], 10015d4f98a2SYan Zheng struct btrfs_file_extent_item); 10025d4f98a2SYan Zheng 10035d4f98a2SYan Zheng BUG_ON(btrfs_file_extent_offset(leaf, fi) || 10045d4f98a2SYan Zheng btrfs_file_extent_compression(leaf, fi) || 10055d4f98a2SYan Zheng btrfs_file_extent_encryption(leaf, fi) || 10065d4f98a2SYan Zheng btrfs_file_extent_other_encoding(leaf, fi)); 10075d4f98a2SYan Zheng 10085d4f98a2SYan Zheng if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { 100983d4cfd4SJosef Bacik ret = -EINVAL; 10105d4f98a2SYan Zheng goto out; 10115d4f98a2SYan Zheng } 10125d4f98a2SYan Zheng 10135d4f98a2SYan Zheng *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 10145d4f98a2SYan Zheng ret = 0; 10155d4f98a2SYan Zheng out: 10165d4f98a2SYan Zheng btrfs_free_path(path); 10175d4f98a2SYan Zheng return ret; 10185d4f98a2SYan Zheng } 10195d4f98a2SYan Zheng 10205d4f98a2SYan Zheng /* 10215d4f98a2SYan Zheng * update file extent items in the tree leaf to point to 10225d4f98a2SYan Zheng * the new locations. 10235d4f98a2SYan Zheng */ 10243fd0a558SYan, Zheng static noinline_for_stack 10253fd0a558SYan, Zheng int replace_file_extents(struct btrfs_trans_handle *trans, 10265d4f98a2SYan Zheng struct reloc_control *rc, 10275d4f98a2SYan Zheng struct btrfs_root *root, 10283fd0a558SYan, Zheng struct extent_buffer *leaf) 10295d4f98a2SYan Zheng { 10300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 10315d4f98a2SYan Zheng struct btrfs_key key; 10325d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 10335d4f98a2SYan Zheng struct inode *inode = NULL; 10345d4f98a2SYan Zheng u64 parent; 10355d4f98a2SYan Zheng u64 bytenr; 10363fd0a558SYan, Zheng u64 new_bytenr = 0; 10375d4f98a2SYan Zheng u64 num_bytes; 10385d4f98a2SYan Zheng u64 end; 10395d4f98a2SYan Zheng u32 nritems; 10405d4f98a2SYan Zheng u32 i; 104183d4cfd4SJosef Bacik int ret = 0; 10425d4f98a2SYan Zheng int first = 1; 10435d4f98a2SYan Zheng int dirty = 0; 10445d4f98a2SYan Zheng 10455d4f98a2SYan Zheng if (rc->stage != UPDATE_DATA_PTRS) 10465d4f98a2SYan Zheng return 0; 10475d4f98a2SYan Zheng 10485d4f98a2SYan Zheng /* reloc trees always use full backref */ 10495d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 10505d4f98a2SYan Zheng parent = leaf->start; 10515d4f98a2SYan Zheng else 10525d4f98a2SYan Zheng parent = 0; 10535d4f98a2SYan Zheng 10545d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 10555d4f98a2SYan Zheng for (i = 0; i < nritems; i++) { 105682fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 105782fa113fSQu Wenruo 10585d4f98a2SYan Zheng cond_resched(); 10595d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, i); 10605d4f98a2SYan Zheng if (key.type != BTRFS_EXTENT_DATA_KEY) 10615d4f98a2SYan Zheng continue; 10625d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 10635d4f98a2SYan Zheng if (btrfs_file_extent_type(leaf, fi) == 10645d4f98a2SYan Zheng BTRFS_FILE_EXTENT_INLINE) 10655d4f98a2SYan Zheng continue; 10665d4f98a2SYan Zheng bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 10675d4f98a2SYan Zheng num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); 10685d4f98a2SYan Zheng if (bytenr == 0) 10695d4f98a2SYan Zheng continue; 10709569cc20SQu Wenruo if (!in_range(bytenr, rc->block_group->start, 10719569cc20SQu Wenruo rc->block_group->length)) 10725d4f98a2SYan Zheng continue; 10735d4f98a2SYan Zheng 10745d4f98a2SYan Zheng /* 10755d4f98a2SYan Zheng * if we are modifying block in fs tree, wait for readpage 10765d4f98a2SYan Zheng * to complete and drop the extent cache 10775d4f98a2SYan Zheng */ 10785d4f98a2SYan Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 10795d4f98a2SYan Zheng if (first) { 10805d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 10815d4f98a2SYan Zheng first = 0; 10824a0cc7caSNikolay Borisov } else if (inode && btrfs_ino(BTRFS_I(inode)) < key.objectid) { 10833fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 10845d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 10855d4f98a2SYan Zheng } 10864a0cc7caSNikolay Borisov if (inode && btrfs_ino(BTRFS_I(inode)) == key.objectid) { 10875d4f98a2SYan Zheng end = key.offset + 10885d4f98a2SYan Zheng btrfs_file_extent_num_bytes(leaf, fi); 10895d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(key.offset, 10900b246afaSJeff Mahoney fs_info->sectorsize)); 10910b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 10925d4f98a2SYan Zheng end--; 10935d4f98a2SYan Zheng ret = try_lock_extent(&BTRFS_I(inode)->io_tree, 1094d0082371SJeff Mahoney key.offset, end); 10955d4f98a2SYan Zheng if (!ret) 10965d4f98a2SYan Zheng continue; 10975d4f98a2SYan Zheng 1098dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), 1099dcdbc059SNikolay Borisov key.offset, end, 1); 11005d4f98a2SYan Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 1101d0082371SJeff Mahoney key.offset, end); 11025d4f98a2SYan Zheng } 11035d4f98a2SYan Zheng } 11045d4f98a2SYan Zheng 11055d4f98a2SYan Zheng ret = get_new_location(rc->data_inode, &new_bytenr, 11065d4f98a2SYan Zheng bytenr, num_bytes); 110783d4cfd4SJosef Bacik if (ret) { 110883d4cfd4SJosef Bacik /* 110983d4cfd4SJosef Bacik * Don't have to abort since we've not changed anything 111083d4cfd4SJosef Bacik * in the file extent yet. 111183d4cfd4SJosef Bacik */ 111283d4cfd4SJosef Bacik break; 11133fd0a558SYan, Zheng } 11145d4f98a2SYan Zheng 11155d4f98a2SYan Zheng btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); 11165d4f98a2SYan Zheng dirty = 1; 11175d4f98a2SYan Zheng 11185d4f98a2SYan Zheng key.offset -= btrfs_file_extent_offset(leaf, fi); 111982fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 112082fa113fSQu Wenruo num_bytes, parent); 112182fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 112282fa113fSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1123b06c4bf5SFilipe Manana key.objectid, key.offset); 112482fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 112583d4cfd4SJosef Bacik if (ret) { 112666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 112783d4cfd4SJosef Bacik break; 112883d4cfd4SJosef Bacik } 11295d4f98a2SYan Zheng 1130ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, bytenr, 1131ffd4bb2aSQu Wenruo num_bytes, parent); 1132ffd4bb2aSQu Wenruo ref.real_root = root->root_key.objectid; 1133ffd4bb2aSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1134b06c4bf5SFilipe Manana key.objectid, key.offset); 1135ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 113683d4cfd4SJosef Bacik if (ret) { 113766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 113883d4cfd4SJosef Bacik break; 113983d4cfd4SJosef Bacik } 11405d4f98a2SYan Zheng } 11415d4f98a2SYan Zheng if (dirty) 11425d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 11433fd0a558SYan, Zheng if (inode) 11443fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 114583d4cfd4SJosef Bacik return ret; 11465d4f98a2SYan Zheng } 11475d4f98a2SYan Zheng 11485d4f98a2SYan Zheng static noinline_for_stack 11495d4f98a2SYan Zheng int memcmp_node_keys(struct extent_buffer *eb, int slot, 11505d4f98a2SYan Zheng struct btrfs_path *path, int level) 11515d4f98a2SYan Zheng { 11525d4f98a2SYan Zheng struct btrfs_disk_key key1; 11535d4f98a2SYan Zheng struct btrfs_disk_key key2; 11545d4f98a2SYan Zheng btrfs_node_key(eb, &key1, slot); 11555d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &key2, path->slots[level]); 11565d4f98a2SYan Zheng return memcmp(&key1, &key2, sizeof(key1)); 11575d4f98a2SYan Zheng } 11585d4f98a2SYan Zheng 11595d4f98a2SYan Zheng /* 11605d4f98a2SYan Zheng * try to replace tree blocks in fs tree with the new blocks 11615d4f98a2SYan Zheng * in reloc tree. tree blocks haven't been modified since the 11625d4f98a2SYan Zheng * reloc tree was create can be replaced. 11635d4f98a2SYan Zheng * 11645d4f98a2SYan Zheng * if a block was replaced, level of the block + 1 is returned. 11655d4f98a2SYan Zheng * if no block got replaced, 0 is returned. if there are other 11665d4f98a2SYan Zheng * errors, a negative error number is returned. 11675d4f98a2SYan Zheng */ 11683fd0a558SYan, Zheng static noinline_for_stack 11693d0174f7SQu Wenruo int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc, 11705d4f98a2SYan Zheng struct btrfs_root *dest, struct btrfs_root *src, 11715d4f98a2SYan Zheng struct btrfs_path *path, struct btrfs_key *next_key, 11725d4f98a2SYan Zheng int lowest_level, int max_level) 11735d4f98a2SYan Zheng { 11740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = dest->fs_info; 11755d4f98a2SYan Zheng struct extent_buffer *eb; 11765d4f98a2SYan Zheng struct extent_buffer *parent; 117782fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 11785d4f98a2SYan Zheng struct btrfs_key key; 11795d4f98a2SYan Zheng u64 old_bytenr; 11805d4f98a2SYan Zheng u64 new_bytenr; 11815d4f98a2SYan Zheng u64 old_ptr_gen; 11825d4f98a2SYan Zheng u64 new_ptr_gen; 11835d4f98a2SYan Zheng u64 last_snapshot; 11845d4f98a2SYan Zheng u32 blocksize; 11853fd0a558SYan, Zheng int cow = 0; 11865d4f98a2SYan Zheng int level; 11875d4f98a2SYan Zheng int ret; 11885d4f98a2SYan Zheng int slot; 11895d4f98a2SYan Zheng 11905d4f98a2SYan Zheng BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 11915d4f98a2SYan Zheng BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); 11925d4f98a2SYan Zheng 11935d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&src->root_item); 11943fd0a558SYan, Zheng again: 11955d4f98a2SYan Zheng slot = path->slots[lowest_level]; 11965d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); 11975d4f98a2SYan Zheng 11985d4f98a2SYan Zheng eb = btrfs_lock_root_node(dest); 11998bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12005d4f98a2SYan Zheng level = btrfs_header_level(eb); 12015d4f98a2SYan Zheng 12025d4f98a2SYan Zheng if (level < lowest_level) { 12035d4f98a2SYan Zheng btrfs_tree_unlock(eb); 12045d4f98a2SYan Zheng free_extent_buffer(eb); 12055d4f98a2SYan Zheng return 0; 12065d4f98a2SYan Zheng } 12075d4f98a2SYan Zheng 12083fd0a558SYan, Zheng if (cow) { 12095d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); 12105d4f98a2SYan Zheng BUG_ON(ret); 12113fd0a558SYan, Zheng } 12128bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12135d4f98a2SYan Zheng 12145d4f98a2SYan Zheng if (next_key) { 12155d4f98a2SYan Zheng next_key->objectid = (u64)-1; 12165d4f98a2SYan Zheng next_key->type = (u8)-1; 12175d4f98a2SYan Zheng next_key->offset = (u64)-1; 12185d4f98a2SYan Zheng } 12195d4f98a2SYan Zheng 12205d4f98a2SYan Zheng parent = eb; 12215d4f98a2SYan Zheng while (1) { 1222581c1760SQu Wenruo struct btrfs_key first_key; 1223581c1760SQu Wenruo 12245d4f98a2SYan Zheng level = btrfs_header_level(parent); 12255d4f98a2SYan Zheng BUG_ON(level < lowest_level); 12265d4f98a2SYan Zheng 1227e3b83361SQu Wenruo ret = btrfs_bin_search(parent, &key, &slot); 1228cbca7d59SFilipe Manana if (ret < 0) 1229cbca7d59SFilipe Manana break; 12305d4f98a2SYan Zheng if (ret && slot > 0) 12315d4f98a2SYan Zheng slot--; 12325d4f98a2SYan Zheng 12335d4f98a2SYan Zheng if (next_key && slot + 1 < btrfs_header_nritems(parent)) 12345d4f98a2SYan Zheng btrfs_node_key_to_cpu(parent, next_key, slot + 1); 12355d4f98a2SYan Zheng 12365d4f98a2SYan Zheng old_bytenr = btrfs_node_blockptr(parent, slot); 12370b246afaSJeff Mahoney blocksize = fs_info->nodesize; 12385d4f98a2SYan Zheng old_ptr_gen = btrfs_node_ptr_generation(parent, slot); 123917515f1bSQu Wenruo btrfs_node_key_to_cpu(parent, &first_key, slot); 12405d4f98a2SYan Zheng 12415d4f98a2SYan Zheng if (level <= max_level) { 12425d4f98a2SYan Zheng eb = path->nodes[level]; 12435d4f98a2SYan Zheng new_bytenr = btrfs_node_blockptr(eb, 12445d4f98a2SYan Zheng path->slots[level]); 12455d4f98a2SYan Zheng new_ptr_gen = btrfs_node_ptr_generation(eb, 12465d4f98a2SYan Zheng path->slots[level]); 12475d4f98a2SYan Zheng } else { 12485d4f98a2SYan Zheng new_bytenr = 0; 12495d4f98a2SYan Zheng new_ptr_gen = 0; 12505d4f98a2SYan Zheng } 12515d4f98a2SYan Zheng 1252fae7f21cSDulshani Gunawardhana if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) { 12535d4f98a2SYan Zheng ret = level; 12545d4f98a2SYan Zheng break; 12555d4f98a2SYan Zheng } 12565d4f98a2SYan Zheng 12575d4f98a2SYan Zheng if (new_bytenr == 0 || old_ptr_gen > last_snapshot || 12585d4f98a2SYan Zheng memcmp_node_keys(parent, slot, path, level)) { 12593fd0a558SYan, Zheng if (level <= lowest_level) { 12605d4f98a2SYan Zheng ret = 0; 12615d4f98a2SYan Zheng break; 12625d4f98a2SYan Zheng } 12635d4f98a2SYan Zheng 1264581c1760SQu Wenruo eb = read_tree_block(fs_info, old_bytenr, old_ptr_gen, 1265581c1760SQu Wenruo level - 1, &first_key); 126664c043deSLiu Bo if (IS_ERR(eb)) { 126764c043deSLiu Bo ret = PTR_ERR(eb); 1268264813acSLiu Bo break; 126964c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 127064c043deSLiu Bo ret = -EIO; 1271416bc658SJosef Bacik free_extent_buffer(eb); 1272379cde74SStefan Behrens break; 1273416bc658SJosef Bacik } 12745d4f98a2SYan Zheng btrfs_tree_lock(eb); 12753fd0a558SYan, Zheng if (cow) { 12765d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, parent, 12775d4f98a2SYan Zheng slot, &eb); 12785d4f98a2SYan Zheng BUG_ON(ret); 12795d4f98a2SYan Zheng } 12808bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12815d4f98a2SYan Zheng 12825d4f98a2SYan Zheng btrfs_tree_unlock(parent); 12835d4f98a2SYan Zheng free_extent_buffer(parent); 12845d4f98a2SYan Zheng 12855d4f98a2SYan Zheng parent = eb; 12865d4f98a2SYan Zheng continue; 12875d4f98a2SYan Zheng } 12885d4f98a2SYan Zheng 12893fd0a558SYan, Zheng if (!cow) { 12903fd0a558SYan, Zheng btrfs_tree_unlock(parent); 12913fd0a558SYan, Zheng free_extent_buffer(parent); 12923fd0a558SYan, Zheng cow = 1; 12933fd0a558SYan, Zheng goto again; 12943fd0a558SYan, Zheng } 12953fd0a558SYan, Zheng 12965d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 12975d4f98a2SYan Zheng path->slots[level]); 1298b3b4aa74SDavid Sterba btrfs_release_path(path); 12995d4f98a2SYan Zheng 13005d4f98a2SYan Zheng path->lowest_level = level; 13015d4f98a2SYan Zheng ret = btrfs_search_slot(trans, src, &key, path, 0, 1); 13025d4f98a2SYan Zheng path->lowest_level = 0; 13035d4f98a2SYan Zheng BUG_ON(ret); 13045d4f98a2SYan Zheng 13055d4f98a2SYan Zheng /* 1306824d8dffSQu Wenruo * Info qgroup to trace both subtrees. 1307824d8dffSQu Wenruo * 1308824d8dffSQu Wenruo * We must trace both trees. 1309824d8dffSQu Wenruo * 1) Tree reloc subtree 1310824d8dffSQu Wenruo * If not traced, we will leak data numbers 1311824d8dffSQu Wenruo * 2) Fs subtree 1312824d8dffSQu Wenruo * If not traced, we will double count old data 1313f616f5cdSQu Wenruo * 1314f616f5cdSQu Wenruo * We don't scan the subtree right now, but only record 1315f616f5cdSQu Wenruo * the swapped tree blocks. 1316f616f5cdSQu Wenruo * The real subtree rescan is delayed until we have new 1317f616f5cdSQu Wenruo * CoW on the subtree root node before transaction commit. 1318824d8dffSQu Wenruo */ 1319370a11b8SQu Wenruo ret = btrfs_qgroup_add_swapped_blocks(trans, dest, 1320370a11b8SQu Wenruo rc->block_group, parent, slot, 1321370a11b8SQu Wenruo path->nodes[level], path->slots[level], 1322370a11b8SQu Wenruo last_snapshot); 1323370a11b8SQu Wenruo if (ret < 0) 1324370a11b8SQu Wenruo break; 1325824d8dffSQu Wenruo /* 13265d4f98a2SYan Zheng * swap blocks in fs tree and reloc tree. 13275d4f98a2SYan Zheng */ 13285d4f98a2SYan Zheng btrfs_set_node_blockptr(parent, slot, new_bytenr); 13295d4f98a2SYan Zheng btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); 13305d4f98a2SYan Zheng btrfs_mark_buffer_dirty(parent); 13315d4f98a2SYan Zheng 13325d4f98a2SYan Zheng btrfs_set_node_blockptr(path->nodes[level], 13335d4f98a2SYan Zheng path->slots[level], old_bytenr); 13345d4f98a2SYan Zheng btrfs_set_node_ptr_generation(path->nodes[level], 13355d4f98a2SYan Zheng path->slots[level], old_ptr_gen); 13365d4f98a2SYan Zheng btrfs_mark_buffer_dirty(path->nodes[level]); 13375d4f98a2SYan Zheng 133882fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr, 133982fa113fSQu Wenruo blocksize, path->nodes[level]->start); 134082fa113fSQu Wenruo ref.skip_qgroup = true; 134182fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 134282fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 13435d4f98a2SYan Zheng BUG_ON(ret); 134482fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 134582fa113fSQu Wenruo blocksize, 0); 134682fa113fSQu Wenruo ref.skip_qgroup = true; 134782fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 134882fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 13495d4f98a2SYan Zheng BUG_ON(ret); 13505d4f98a2SYan Zheng 1351ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, new_bytenr, 1352ffd4bb2aSQu Wenruo blocksize, path->nodes[level]->start); 1353ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 1354ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1355ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 13565d4f98a2SYan Zheng BUG_ON(ret); 13575d4f98a2SYan Zheng 1358ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, old_bytenr, 1359ffd4bb2aSQu Wenruo blocksize, 0); 1360ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 1361ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1362ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 13635d4f98a2SYan Zheng BUG_ON(ret); 13645d4f98a2SYan Zheng 13655d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 13665d4f98a2SYan Zheng 13675d4f98a2SYan Zheng ret = level; 13685d4f98a2SYan Zheng break; 13695d4f98a2SYan Zheng } 13705d4f98a2SYan Zheng btrfs_tree_unlock(parent); 13715d4f98a2SYan Zheng free_extent_buffer(parent); 13725d4f98a2SYan Zheng return ret; 13735d4f98a2SYan Zheng } 13745d4f98a2SYan Zheng 13755d4f98a2SYan Zheng /* 13765d4f98a2SYan Zheng * helper to find next relocated block in reloc tree 13775d4f98a2SYan Zheng */ 13785d4f98a2SYan Zheng static noinline_for_stack 13795d4f98a2SYan Zheng int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 13805d4f98a2SYan Zheng int *level) 13815d4f98a2SYan Zheng { 13825d4f98a2SYan Zheng struct extent_buffer *eb; 13835d4f98a2SYan Zheng int i; 13845d4f98a2SYan Zheng u64 last_snapshot; 13855d4f98a2SYan Zheng u32 nritems; 13865d4f98a2SYan Zheng 13875d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 13885d4f98a2SYan Zheng 13895d4f98a2SYan Zheng for (i = 0; i < *level; i++) { 13905d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 13915d4f98a2SYan Zheng path->nodes[i] = NULL; 13925d4f98a2SYan Zheng } 13935d4f98a2SYan Zheng 13945d4f98a2SYan Zheng for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { 13955d4f98a2SYan Zheng eb = path->nodes[i]; 13965d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 13975d4f98a2SYan Zheng while (path->slots[i] + 1 < nritems) { 13985d4f98a2SYan Zheng path->slots[i]++; 13995d4f98a2SYan Zheng if (btrfs_node_ptr_generation(eb, path->slots[i]) <= 14005d4f98a2SYan Zheng last_snapshot) 14015d4f98a2SYan Zheng continue; 14025d4f98a2SYan Zheng 14035d4f98a2SYan Zheng *level = i; 14045d4f98a2SYan Zheng return 0; 14055d4f98a2SYan Zheng } 14065d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 14075d4f98a2SYan Zheng path->nodes[i] = NULL; 14085d4f98a2SYan Zheng } 14095d4f98a2SYan Zheng return 1; 14105d4f98a2SYan Zheng } 14115d4f98a2SYan Zheng 14125d4f98a2SYan Zheng /* 14135d4f98a2SYan Zheng * walk down reloc tree to find relocated block of lowest level 14145d4f98a2SYan Zheng */ 14155d4f98a2SYan Zheng static noinline_for_stack 14165d4f98a2SYan Zheng int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 14175d4f98a2SYan Zheng int *level) 14185d4f98a2SYan Zheng { 14192ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 14205d4f98a2SYan Zheng struct extent_buffer *eb = NULL; 14215d4f98a2SYan Zheng int i; 14225d4f98a2SYan Zheng u64 bytenr; 14235d4f98a2SYan Zheng u64 ptr_gen = 0; 14245d4f98a2SYan Zheng u64 last_snapshot; 14255d4f98a2SYan Zheng u32 nritems; 14265d4f98a2SYan Zheng 14275d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 14285d4f98a2SYan Zheng 14295d4f98a2SYan Zheng for (i = *level; i > 0; i--) { 1430581c1760SQu Wenruo struct btrfs_key first_key; 1431581c1760SQu Wenruo 14325d4f98a2SYan Zheng eb = path->nodes[i]; 14335d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 14345d4f98a2SYan Zheng while (path->slots[i] < nritems) { 14355d4f98a2SYan Zheng ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); 14365d4f98a2SYan Zheng if (ptr_gen > last_snapshot) 14375d4f98a2SYan Zheng break; 14385d4f98a2SYan Zheng path->slots[i]++; 14395d4f98a2SYan Zheng } 14405d4f98a2SYan Zheng if (path->slots[i] >= nritems) { 14415d4f98a2SYan Zheng if (i == *level) 14425d4f98a2SYan Zheng break; 14435d4f98a2SYan Zheng *level = i + 1; 14445d4f98a2SYan Zheng return 0; 14455d4f98a2SYan Zheng } 14465d4f98a2SYan Zheng if (i == 1) { 14475d4f98a2SYan Zheng *level = i; 14485d4f98a2SYan Zheng return 0; 14495d4f98a2SYan Zheng } 14505d4f98a2SYan Zheng 14515d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(eb, path->slots[i]); 1452581c1760SQu Wenruo btrfs_node_key_to_cpu(eb, &first_key, path->slots[i]); 1453581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, ptr_gen, i - 1, 1454581c1760SQu Wenruo &first_key); 145564c043deSLiu Bo if (IS_ERR(eb)) { 145664c043deSLiu Bo return PTR_ERR(eb); 145764c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 1458416bc658SJosef Bacik free_extent_buffer(eb); 1459416bc658SJosef Bacik return -EIO; 1460416bc658SJosef Bacik } 14615d4f98a2SYan Zheng BUG_ON(btrfs_header_level(eb) != i - 1); 14625d4f98a2SYan Zheng path->nodes[i - 1] = eb; 14635d4f98a2SYan Zheng path->slots[i - 1] = 0; 14645d4f98a2SYan Zheng } 14655d4f98a2SYan Zheng return 1; 14665d4f98a2SYan Zheng } 14675d4f98a2SYan Zheng 14685d4f98a2SYan Zheng /* 14695d4f98a2SYan Zheng * invalidate extent cache for file extents whose key in range of 14705d4f98a2SYan Zheng * [min_key, max_key) 14715d4f98a2SYan Zheng */ 14725d4f98a2SYan Zheng static int invalidate_extent_cache(struct btrfs_root *root, 14735d4f98a2SYan Zheng struct btrfs_key *min_key, 14745d4f98a2SYan Zheng struct btrfs_key *max_key) 14755d4f98a2SYan Zheng { 14760b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 14775d4f98a2SYan Zheng struct inode *inode = NULL; 14785d4f98a2SYan Zheng u64 objectid; 14795d4f98a2SYan Zheng u64 start, end; 148033345d01SLi Zefan u64 ino; 14815d4f98a2SYan Zheng 14825d4f98a2SYan Zheng objectid = min_key->objectid; 14835d4f98a2SYan Zheng while (1) { 14845d4f98a2SYan Zheng cond_resched(); 14855d4f98a2SYan Zheng iput(inode); 14865d4f98a2SYan Zheng 14875d4f98a2SYan Zheng if (objectid > max_key->objectid) 14885d4f98a2SYan Zheng break; 14895d4f98a2SYan Zheng 14905d4f98a2SYan Zheng inode = find_next_inode(root, objectid); 14915d4f98a2SYan Zheng if (!inode) 14925d4f98a2SYan Zheng break; 14934a0cc7caSNikolay Borisov ino = btrfs_ino(BTRFS_I(inode)); 14945d4f98a2SYan Zheng 149533345d01SLi Zefan if (ino > max_key->objectid) { 14965d4f98a2SYan Zheng iput(inode); 14975d4f98a2SYan Zheng break; 14985d4f98a2SYan Zheng } 14995d4f98a2SYan Zheng 150033345d01SLi Zefan objectid = ino + 1; 15015d4f98a2SYan Zheng if (!S_ISREG(inode->i_mode)) 15025d4f98a2SYan Zheng continue; 15035d4f98a2SYan Zheng 150433345d01SLi Zefan if (unlikely(min_key->objectid == ino)) { 15055d4f98a2SYan Zheng if (min_key->type > BTRFS_EXTENT_DATA_KEY) 15065d4f98a2SYan Zheng continue; 15075d4f98a2SYan Zheng if (min_key->type < BTRFS_EXTENT_DATA_KEY) 15085d4f98a2SYan Zheng start = 0; 15095d4f98a2SYan Zheng else { 15105d4f98a2SYan Zheng start = min_key->offset; 15110b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(start, fs_info->sectorsize)); 15125d4f98a2SYan Zheng } 15135d4f98a2SYan Zheng } else { 15145d4f98a2SYan Zheng start = 0; 15155d4f98a2SYan Zheng } 15165d4f98a2SYan Zheng 151733345d01SLi Zefan if (unlikely(max_key->objectid == ino)) { 15185d4f98a2SYan Zheng if (max_key->type < BTRFS_EXTENT_DATA_KEY) 15195d4f98a2SYan Zheng continue; 15205d4f98a2SYan Zheng if (max_key->type > BTRFS_EXTENT_DATA_KEY) { 15215d4f98a2SYan Zheng end = (u64)-1; 15225d4f98a2SYan Zheng } else { 15235d4f98a2SYan Zheng if (max_key->offset == 0) 15245d4f98a2SYan Zheng continue; 15255d4f98a2SYan Zheng end = max_key->offset; 15260b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 15275d4f98a2SYan Zheng end--; 15285d4f98a2SYan Zheng } 15295d4f98a2SYan Zheng } else { 15305d4f98a2SYan Zheng end = (u64)-1; 15315d4f98a2SYan Zheng } 15325d4f98a2SYan Zheng 15335d4f98a2SYan Zheng /* the lock_extent waits for readpage to complete */ 1534d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 1535dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 1); 1536d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 15375d4f98a2SYan Zheng } 15385d4f98a2SYan Zheng return 0; 15395d4f98a2SYan Zheng } 15405d4f98a2SYan Zheng 15415d4f98a2SYan Zheng static int find_next_key(struct btrfs_path *path, int level, 15425d4f98a2SYan Zheng struct btrfs_key *key) 15435d4f98a2SYan Zheng 15445d4f98a2SYan Zheng { 15455d4f98a2SYan Zheng while (level < BTRFS_MAX_LEVEL) { 15465d4f98a2SYan Zheng if (!path->nodes[level]) 15475d4f98a2SYan Zheng break; 15485d4f98a2SYan Zheng if (path->slots[level] + 1 < 15495d4f98a2SYan Zheng btrfs_header_nritems(path->nodes[level])) { 15505d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], key, 15515d4f98a2SYan Zheng path->slots[level] + 1); 15525d4f98a2SYan Zheng return 0; 15535d4f98a2SYan Zheng } 15545d4f98a2SYan Zheng level++; 15555d4f98a2SYan Zheng } 15565d4f98a2SYan Zheng return 1; 15575d4f98a2SYan Zheng } 15585d4f98a2SYan Zheng 15595d4f98a2SYan Zheng /* 1560d2311e69SQu Wenruo * Insert current subvolume into reloc_control::dirty_subvol_roots 1561d2311e69SQu Wenruo */ 1562d2311e69SQu Wenruo static void insert_dirty_subvol(struct btrfs_trans_handle *trans, 1563d2311e69SQu Wenruo struct reloc_control *rc, 1564d2311e69SQu Wenruo struct btrfs_root *root) 1565d2311e69SQu Wenruo { 1566d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1567d2311e69SQu Wenruo struct btrfs_root_item *reloc_root_item; 1568d2311e69SQu Wenruo 1569d2311e69SQu Wenruo /* @root must be a subvolume tree root with a valid reloc tree */ 1570d2311e69SQu Wenruo ASSERT(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 1571d2311e69SQu Wenruo ASSERT(reloc_root); 1572d2311e69SQu Wenruo 1573d2311e69SQu Wenruo reloc_root_item = &reloc_root->root_item; 1574d2311e69SQu Wenruo memset(&reloc_root_item->drop_progress, 0, 1575d2311e69SQu Wenruo sizeof(reloc_root_item->drop_progress)); 1576d2311e69SQu Wenruo reloc_root_item->drop_level = 0; 1577d2311e69SQu Wenruo btrfs_set_root_refs(reloc_root_item, 0); 1578d2311e69SQu Wenruo btrfs_update_reloc_root(trans, root); 1579d2311e69SQu Wenruo 1580d2311e69SQu Wenruo if (list_empty(&root->reloc_dirty_list)) { 158100246528SJosef Bacik btrfs_grab_root(root); 1582d2311e69SQu Wenruo list_add_tail(&root->reloc_dirty_list, &rc->dirty_subvol_roots); 1583d2311e69SQu Wenruo } 1584d2311e69SQu Wenruo } 1585d2311e69SQu Wenruo 1586d2311e69SQu Wenruo static int clean_dirty_subvols(struct reloc_control *rc) 1587d2311e69SQu Wenruo { 1588d2311e69SQu Wenruo struct btrfs_root *root; 1589d2311e69SQu Wenruo struct btrfs_root *next; 1590d2311e69SQu Wenruo int ret = 0; 159130d40577SQu Wenruo int ret2; 1592d2311e69SQu Wenruo 1593d2311e69SQu Wenruo list_for_each_entry_safe(root, next, &rc->dirty_subvol_roots, 1594d2311e69SQu Wenruo reloc_dirty_list) { 159530d40577SQu Wenruo if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 159630d40577SQu Wenruo /* Merged subvolume, cleanup its reloc root */ 1597d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1598d2311e69SQu Wenruo 1599d2311e69SQu Wenruo list_del_init(&root->reloc_dirty_list); 1600d2311e69SQu Wenruo root->reloc_root = NULL; 16016282675eSQu Wenruo /* 16026282675eSQu Wenruo * Need barrier to ensure clear_bit() only happens after 16036282675eSQu Wenruo * root->reloc_root = NULL. Pairs with have_reloc_root. 16046282675eSQu Wenruo */ 16056282675eSQu Wenruo smp_wmb(); 16061fac4a54SQu Wenruo clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 1607f28de8d8SJosef Bacik if (reloc_root) { 1608f44deb74SJosef Bacik /* 1609f44deb74SJosef Bacik * btrfs_drop_snapshot drops our ref we hold for 1610f44deb74SJosef Bacik * ->reloc_root. If it fails however we must 1611f44deb74SJosef Bacik * drop the ref ourselves. 1612f44deb74SJosef Bacik */ 1613f28de8d8SJosef Bacik ret2 = btrfs_drop_snapshot(reloc_root, 0, 1); 1614f44deb74SJosef Bacik if (ret2 < 0) { 1615f44deb74SJosef Bacik btrfs_put_root(reloc_root); 1616f44deb74SJosef Bacik if (!ret) 1617f28de8d8SJosef Bacik ret = ret2; 1618f28de8d8SJosef Bacik } 1619f44deb74SJosef Bacik } 162000246528SJosef Bacik btrfs_put_root(root); 162130d40577SQu Wenruo } else { 162230d40577SQu Wenruo /* Orphan reloc tree, just clean it up */ 16230078a9f9SNikolay Borisov ret2 = btrfs_drop_snapshot(root, 0, 1); 1624f44deb74SJosef Bacik if (ret2 < 0) { 1625f44deb74SJosef Bacik btrfs_put_root(root); 1626f44deb74SJosef Bacik if (!ret) 162730d40577SQu Wenruo ret = ret2; 162830d40577SQu Wenruo } 1629d2311e69SQu Wenruo } 1630f44deb74SJosef Bacik } 1631d2311e69SQu Wenruo return ret; 1632d2311e69SQu Wenruo } 1633d2311e69SQu Wenruo 1634d2311e69SQu Wenruo /* 16355d4f98a2SYan Zheng * merge the relocated tree blocks in reloc tree with corresponding 16365d4f98a2SYan Zheng * fs tree. 16375d4f98a2SYan Zheng */ 16385d4f98a2SYan Zheng static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, 16395d4f98a2SYan Zheng struct btrfs_root *root) 16405d4f98a2SYan Zheng { 16410b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 16425d4f98a2SYan Zheng struct btrfs_key key; 16435d4f98a2SYan Zheng struct btrfs_key next_key; 16449e6a0c52SJosef Bacik struct btrfs_trans_handle *trans = NULL; 16455d4f98a2SYan Zheng struct btrfs_root *reloc_root; 16465d4f98a2SYan Zheng struct btrfs_root_item *root_item; 16475d4f98a2SYan Zheng struct btrfs_path *path; 16483fd0a558SYan, Zheng struct extent_buffer *leaf; 16495d4f98a2SYan Zheng int level; 16505d4f98a2SYan Zheng int max_level; 16515d4f98a2SYan Zheng int replaced = 0; 16525d4f98a2SYan Zheng int ret; 16535d4f98a2SYan Zheng int err = 0; 16543fd0a558SYan, Zheng u32 min_reserved; 16555d4f98a2SYan Zheng 16565d4f98a2SYan Zheng path = btrfs_alloc_path(); 16575d4f98a2SYan Zheng if (!path) 16585d4f98a2SYan Zheng return -ENOMEM; 1659e4058b54SDavid Sterba path->reada = READA_FORWARD; 16605d4f98a2SYan Zheng 16615d4f98a2SYan Zheng reloc_root = root->reloc_root; 16625d4f98a2SYan Zheng root_item = &reloc_root->root_item; 16635d4f98a2SYan Zheng 16645d4f98a2SYan Zheng if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { 16655d4f98a2SYan Zheng level = btrfs_root_level(root_item); 166667439dadSDavid Sterba atomic_inc(&reloc_root->node->refs); 16675d4f98a2SYan Zheng path->nodes[level] = reloc_root->node; 16685d4f98a2SYan Zheng path->slots[level] = 0; 16695d4f98a2SYan Zheng } else { 16705d4f98a2SYan Zheng btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); 16715d4f98a2SYan Zheng 16725d4f98a2SYan Zheng level = root_item->drop_level; 16735d4f98a2SYan Zheng BUG_ON(level == 0); 16745d4f98a2SYan Zheng path->lowest_level = level; 16755d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); 167633c66f43SYan Zheng path->lowest_level = 0; 16775d4f98a2SYan Zheng if (ret < 0) { 16785d4f98a2SYan Zheng btrfs_free_path(path); 16795d4f98a2SYan Zheng return ret; 16805d4f98a2SYan Zheng } 16815d4f98a2SYan Zheng 16825d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &next_key, 16835d4f98a2SYan Zheng path->slots[level]); 16845d4f98a2SYan Zheng WARN_ON(memcmp(&key, &next_key, sizeof(key))); 16855d4f98a2SYan Zheng 16865d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 16875d4f98a2SYan Zheng } 16885d4f98a2SYan Zheng 16890b246afaSJeff Mahoney min_reserved = fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 16905d4f98a2SYan Zheng memset(&next_key, 0, sizeof(next_key)); 16915d4f98a2SYan Zheng 16925d4f98a2SYan Zheng while (1) { 169308e007d2SMiao Xie ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, 169408e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 16953fd0a558SYan, Zheng if (ret) { 16969e6a0c52SJosef Bacik err = ret; 16979e6a0c52SJosef Bacik goto out; 16983fd0a558SYan, Zheng } 16999e6a0c52SJosef Bacik trans = btrfs_start_transaction(root, 0); 17009e6a0c52SJosef Bacik if (IS_ERR(trans)) { 17019e6a0c52SJosef Bacik err = PTR_ERR(trans); 17029e6a0c52SJosef Bacik trans = NULL; 17039e6a0c52SJosef Bacik goto out; 17049e6a0c52SJosef Bacik } 17052abc726aSJosef Bacik 17062abc726aSJosef Bacik /* 17072abc726aSJosef Bacik * At this point we no longer have a reloc_control, so we can't 17082abc726aSJosef Bacik * depend on btrfs_init_reloc_root to update our last_trans. 17092abc726aSJosef Bacik * 17102abc726aSJosef Bacik * But that's ok, we started the trans handle on our 17112abc726aSJosef Bacik * corresponding fs_root, which means it's been added to the 17122abc726aSJosef Bacik * dirty list. At commit time we'll still call 17132abc726aSJosef Bacik * btrfs_update_reloc_root() and update our root item 17142abc726aSJosef Bacik * appropriately. 17152abc726aSJosef Bacik */ 17162abc726aSJosef Bacik reloc_root->last_trans = trans->transid; 17179e6a0c52SJosef Bacik trans->block_rsv = rc->block_rsv; 17183fd0a558SYan, Zheng 17193fd0a558SYan, Zheng replaced = 0; 17205d4f98a2SYan Zheng max_level = level; 17215d4f98a2SYan Zheng 17225d4f98a2SYan Zheng ret = walk_down_reloc_tree(reloc_root, path, &level); 17235d4f98a2SYan Zheng if (ret < 0) { 17245d4f98a2SYan Zheng err = ret; 17255d4f98a2SYan Zheng goto out; 17265d4f98a2SYan Zheng } 17275d4f98a2SYan Zheng if (ret > 0) 17285d4f98a2SYan Zheng break; 17295d4f98a2SYan Zheng 17305d4f98a2SYan Zheng if (!find_next_key(path, level, &key) && 17315d4f98a2SYan Zheng btrfs_comp_cpu_keys(&next_key, &key) >= 0) { 17325d4f98a2SYan Zheng ret = 0; 17335d4f98a2SYan Zheng } else { 17343d0174f7SQu Wenruo ret = replace_path(trans, rc, root, reloc_root, path, 17353fd0a558SYan, Zheng &next_key, level, max_level); 17365d4f98a2SYan Zheng } 17375d4f98a2SYan Zheng if (ret < 0) { 17385d4f98a2SYan Zheng err = ret; 17395d4f98a2SYan Zheng goto out; 17405d4f98a2SYan Zheng } 17415d4f98a2SYan Zheng 17425d4f98a2SYan Zheng if (ret > 0) { 17435d4f98a2SYan Zheng level = ret; 17445d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 17455d4f98a2SYan Zheng path->slots[level]); 17465d4f98a2SYan Zheng replaced = 1; 17475d4f98a2SYan Zheng } 17485d4f98a2SYan Zheng 17495d4f98a2SYan Zheng ret = walk_up_reloc_tree(reloc_root, path, &level); 17505d4f98a2SYan Zheng if (ret > 0) 17515d4f98a2SYan Zheng break; 17525d4f98a2SYan Zheng 17535d4f98a2SYan Zheng BUG_ON(level == 0); 17545d4f98a2SYan Zheng /* 17555d4f98a2SYan Zheng * save the merging progress in the drop_progress. 17565d4f98a2SYan Zheng * this is OK since root refs == 1 in this case. 17575d4f98a2SYan Zheng */ 17585d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &root_item->drop_progress, 17595d4f98a2SYan Zheng path->slots[level]); 17605d4f98a2SYan Zheng root_item->drop_level = level; 17615d4f98a2SYan Zheng 17623a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 17639e6a0c52SJosef Bacik trans = NULL; 17645d4f98a2SYan Zheng 17652ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 17665d4f98a2SYan Zheng 17675d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 17685d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 17695d4f98a2SYan Zheng } 17705d4f98a2SYan Zheng 17715d4f98a2SYan Zheng /* 17725d4f98a2SYan Zheng * handle the case only one block in the fs tree need to be 17735d4f98a2SYan Zheng * relocated and the block is tree root. 17745d4f98a2SYan Zheng */ 17755d4f98a2SYan Zheng leaf = btrfs_lock_root_node(root); 17765d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); 17775d4f98a2SYan Zheng btrfs_tree_unlock(leaf); 17785d4f98a2SYan Zheng free_extent_buffer(leaf); 17795d4f98a2SYan Zheng if (ret < 0) 17805d4f98a2SYan Zheng err = ret; 17815d4f98a2SYan Zheng out: 17825d4f98a2SYan Zheng btrfs_free_path(path); 17835d4f98a2SYan Zheng 1784d2311e69SQu Wenruo if (err == 0) 1785d2311e69SQu Wenruo insert_dirty_subvol(trans, rc, root); 17865d4f98a2SYan Zheng 17879e6a0c52SJosef Bacik if (trans) 17883a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 17895d4f98a2SYan Zheng 17902ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 17915d4f98a2SYan Zheng 17925d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 17935d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 17945d4f98a2SYan Zheng 17955d4f98a2SYan Zheng return err; 17965d4f98a2SYan Zheng } 17975d4f98a2SYan Zheng 17983fd0a558SYan, Zheng static noinline_for_stack 17993fd0a558SYan, Zheng int prepare_to_merge(struct reloc_control *rc, int err) 18005d4f98a2SYan Zheng { 18013fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 18020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 18033fd0a558SYan, Zheng struct btrfs_root *reloc_root; 18045d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 18053fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 18063fd0a558SYan, Zheng u64 num_bytes = 0; 18073fd0a558SYan, Zheng int ret; 18083fd0a558SYan, Zheng 18090b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 18100b246afaSJeff Mahoney rc->merging_rsv_size += fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 18113fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated * 2; 18120b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 18137585717fSChris Mason 18143fd0a558SYan, Zheng again: 18153fd0a558SYan, Zheng if (!err) { 18163fd0a558SYan, Zheng num_bytes = rc->merging_rsv_size; 181708e007d2SMiao Xie ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, 181808e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 18193fd0a558SYan, Zheng if (ret) 18203fd0a558SYan, Zheng err = ret; 18213fd0a558SYan, Zheng } 18223fd0a558SYan, Zheng 18237a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 18243612b495STsutomu Itoh if (IS_ERR(trans)) { 18253612b495STsutomu Itoh if (!err) 18262ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 182763f018beSNikolay Borisov num_bytes, NULL); 18283612b495STsutomu Itoh return PTR_ERR(trans); 18293612b495STsutomu Itoh } 18303fd0a558SYan, Zheng 18313fd0a558SYan, Zheng if (!err) { 18323fd0a558SYan, Zheng if (num_bytes != rc->merging_rsv_size) { 18333a45bb20SJeff Mahoney btrfs_end_transaction(trans); 18342ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 183563f018beSNikolay Borisov num_bytes, NULL); 18363fd0a558SYan, Zheng goto again; 18373fd0a558SYan, Zheng } 18383fd0a558SYan, Zheng } 18393fd0a558SYan, Zheng 18403fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 18413fd0a558SYan, Zheng 18423fd0a558SYan, Zheng while (!list_empty(&rc->reloc_roots)) { 18433fd0a558SYan, Zheng reloc_root = list_entry(rc->reloc_roots.next, 18443fd0a558SYan, Zheng struct btrfs_root, root_list); 18453fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 18463fd0a558SYan, Zheng 1847a820feb5SDavid Sterba root = btrfs_get_fs_root(fs_info, reloc_root->root_key.offset, 1848a820feb5SDavid Sterba false); 18493fd0a558SYan, Zheng BUG_ON(IS_ERR(root)); 18503fd0a558SYan, Zheng BUG_ON(root->reloc_root != reloc_root); 18513fd0a558SYan, Zheng 18523fd0a558SYan, Zheng /* 18533fd0a558SYan, Zheng * set reference count to 1, so btrfs_recover_relocation 18543fd0a558SYan, Zheng * knows it should resumes merging 18553fd0a558SYan, Zheng */ 18563fd0a558SYan, Zheng if (!err) 18573fd0a558SYan, Zheng btrfs_set_root_refs(&reloc_root->root_item, 1); 18583fd0a558SYan, Zheng btrfs_update_reloc_root(trans, root); 18593fd0a558SYan, Zheng 18603fd0a558SYan, Zheng list_add(&reloc_root->root_list, &reloc_roots); 186100246528SJosef Bacik btrfs_put_root(root); 18623fd0a558SYan, Zheng } 18633fd0a558SYan, Zheng 18643fd0a558SYan, Zheng list_splice(&reloc_roots, &rc->reloc_roots); 18653fd0a558SYan, Zheng 18663fd0a558SYan, Zheng if (!err) 18673a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 18683fd0a558SYan, Zheng else 18693a45bb20SJeff Mahoney btrfs_end_transaction(trans); 18703fd0a558SYan, Zheng return err; 18713fd0a558SYan, Zheng } 18723fd0a558SYan, Zheng 18733fd0a558SYan, Zheng static noinline_for_stack 1874aca1bba6SLiu Bo void free_reloc_roots(struct list_head *list) 1875aca1bba6SLiu Bo { 1876a7571232SNikolay Borisov struct btrfs_root *reloc_root, *tmp; 1877aca1bba6SLiu Bo 1878a7571232SNikolay Borisov list_for_each_entry_safe(reloc_root, tmp, list, root_list) 1879bb166d72SNaohiro Aota __del_reloc_root(reloc_root); 1880aca1bba6SLiu Bo } 1881aca1bba6SLiu Bo 1882aca1bba6SLiu Bo static noinline_for_stack 188394404e82SDavid Sterba void merge_reloc_roots(struct reloc_control *rc) 18843fd0a558SYan, Zheng { 18850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 18865d4f98a2SYan Zheng struct btrfs_root *root; 18875d4f98a2SYan Zheng struct btrfs_root *reloc_root; 18883fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 18893fd0a558SYan, Zheng int found = 0; 1890aca1bba6SLiu Bo int ret = 0; 18913fd0a558SYan, Zheng again: 18923fd0a558SYan, Zheng root = rc->extent_root; 18937585717fSChris Mason 18947585717fSChris Mason /* 18957585717fSChris Mason * this serializes us with btrfs_record_root_in_transaction, 18967585717fSChris Mason * we have to make sure nobody is in the middle of 18977585717fSChris Mason * adding their roots to the list while we are 18987585717fSChris Mason * doing this splice 18997585717fSChris Mason */ 19000b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 19013fd0a558SYan, Zheng list_splice_init(&rc->reloc_roots, &reloc_roots); 19020b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 19035d4f98a2SYan Zheng 19043fd0a558SYan, Zheng while (!list_empty(&reloc_roots)) { 19053fd0a558SYan, Zheng found = 1; 19063fd0a558SYan, Zheng reloc_root = list_entry(reloc_roots.next, 19073fd0a558SYan, Zheng struct btrfs_root, root_list); 19085d4f98a2SYan Zheng 1909a820feb5SDavid Sterba root = btrfs_get_fs_root(fs_info, reloc_root->root_key.offset, 1910a820feb5SDavid Sterba false); 19115d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 19125d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 19135d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 19143fd0a558SYan, Zheng ret = merge_reloc_root(rc, root); 191500246528SJosef Bacik btrfs_put_root(root); 1916b37b39cdSJosef Bacik if (ret) { 191725e293c2SWang Shilong if (list_empty(&reloc_root->root_list)) 191825e293c2SWang Shilong list_add_tail(&reloc_root->root_list, 191925e293c2SWang Shilong &reloc_roots); 1920aca1bba6SLiu Bo goto out; 1921b37b39cdSJosef Bacik } 19223fd0a558SYan, Zheng } else { 192351415b6cSQu Wenruo if (!IS_ERR(root)) { 192451415b6cSQu Wenruo if (root->reloc_root == reloc_root) { 192551415b6cSQu Wenruo root->reloc_root = NULL; 192651415b6cSQu Wenruo btrfs_put_root(reloc_root); 192751415b6cSQu Wenruo } 19281dae7e0eSQu Wenruo clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, 19291dae7e0eSQu Wenruo &root->state); 193051415b6cSQu Wenruo btrfs_put_root(root); 193151415b6cSQu Wenruo } 193251415b6cSQu Wenruo 19333fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 193430d40577SQu Wenruo /* Don't forget to queue this reloc root for cleanup */ 193530d40577SQu Wenruo list_add_tail(&reloc_root->reloc_dirty_list, 193630d40577SQu Wenruo &rc->dirty_subvol_roots); 19373fd0a558SYan, Zheng } 19385d4f98a2SYan Zheng } 19395d4f98a2SYan Zheng 19403fd0a558SYan, Zheng if (found) { 19413fd0a558SYan, Zheng found = 0; 19423fd0a558SYan, Zheng goto again; 19435d4f98a2SYan Zheng } 1944aca1bba6SLiu Bo out: 1945aca1bba6SLiu Bo if (ret) { 19460b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, ret, NULL); 1947aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 1948467bb1d2SWang Shilong 1949467bb1d2SWang Shilong /* new reloc root may be added */ 19500b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 1951467bb1d2SWang Shilong list_splice_init(&rc->reloc_roots, &reloc_roots); 19520b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 1953467bb1d2SWang Shilong free_reloc_roots(&reloc_roots); 1954aca1bba6SLiu Bo } 1955aca1bba6SLiu Bo 19567b7b7431SJosef Bacik /* 19577b7b7431SJosef Bacik * We used to have 19587b7b7431SJosef Bacik * 19597b7b7431SJosef Bacik * BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); 19607b7b7431SJosef Bacik * 19617b7b7431SJosef Bacik * here, but it's wrong. If we fail to start the transaction in 19627b7b7431SJosef Bacik * prepare_to_merge() we will have only 0 ref reloc roots, none of which 19637b7b7431SJosef Bacik * have actually been removed from the reloc_root_tree rb tree. This is 19647b7b7431SJosef Bacik * fine because we're bailing here, and we hold a reference on the root 19657b7b7431SJosef Bacik * for the list that holds it, so these roots will be cleaned up when we 19667b7b7431SJosef Bacik * do the reloc_dirty_list afterwards. Meanwhile the root->reloc_root 19677b7b7431SJosef Bacik * will be cleaned up on unmount. 19687b7b7431SJosef Bacik * 19697b7b7431SJosef Bacik * The remaining nodes will be cleaned up by free_reloc_control. 19707b7b7431SJosef Bacik */ 19715d4f98a2SYan Zheng } 19725d4f98a2SYan Zheng 19735d4f98a2SYan Zheng static void free_block_list(struct rb_root *blocks) 19745d4f98a2SYan Zheng { 19755d4f98a2SYan Zheng struct tree_block *block; 19765d4f98a2SYan Zheng struct rb_node *rb_node; 19775d4f98a2SYan Zheng while ((rb_node = rb_first(blocks))) { 19785d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 19795d4f98a2SYan Zheng rb_erase(rb_node, blocks); 19805d4f98a2SYan Zheng kfree(block); 19815d4f98a2SYan Zheng } 19825d4f98a2SYan Zheng } 19835d4f98a2SYan Zheng 19845d4f98a2SYan Zheng static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, 19855d4f98a2SYan Zheng struct btrfs_root *reloc_root) 19865d4f98a2SYan Zheng { 19870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = reloc_root->fs_info; 19885d4f98a2SYan Zheng struct btrfs_root *root; 1989442b1ac5SJosef Bacik int ret; 19905d4f98a2SYan Zheng 19915d4f98a2SYan Zheng if (reloc_root->last_trans == trans->transid) 19925d4f98a2SYan Zheng return 0; 19935d4f98a2SYan Zheng 1994a820feb5SDavid Sterba root = btrfs_get_fs_root(fs_info, reloc_root->root_key.offset, false); 19955d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 19965d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 1997442b1ac5SJosef Bacik ret = btrfs_record_root_in_trans(trans, root); 199800246528SJosef Bacik btrfs_put_root(root); 19995d4f98a2SYan Zheng 2000442b1ac5SJosef Bacik return ret; 20015d4f98a2SYan Zheng } 20025d4f98a2SYan Zheng 20033fd0a558SYan, Zheng static noinline_for_stack 20043fd0a558SYan, Zheng struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, 20053fd0a558SYan, Zheng struct reloc_control *rc, 2006a26195a5SQu Wenruo struct btrfs_backref_node *node, 2007a26195a5SQu Wenruo struct btrfs_backref_edge *edges[]) 20085d4f98a2SYan Zheng { 2009a26195a5SQu Wenruo struct btrfs_backref_node *next; 20105d4f98a2SYan Zheng struct btrfs_root *root; 20113fd0a558SYan, Zheng int index = 0; 20123fd0a558SYan, Zheng 20135d4f98a2SYan Zheng next = node; 20145d4f98a2SYan Zheng while (1) { 20155d4f98a2SYan Zheng cond_resched(); 20165d4f98a2SYan Zheng next = walk_up_backref(next, edges, &index); 20175d4f98a2SYan Zheng root = next->root; 20183fd0a558SYan, Zheng BUG_ON(!root); 201992a7cc42SQu Wenruo BUG_ON(!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)); 20205d4f98a2SYan Zheng 20215d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { 20225d4f98a2SYan Zheng record_reloc_root_in_trans(trans, root); 20235d4f98a2SYan Zheng break; 20245d4f98a2SYan Zheng } 20255d4f98a2SYan Zheng 20265d4f98a2SYan Zheng btrfs_record_root_in_trans(trans, root); 20273fd0a558SYan, Zheng root = root->reloc_root; 20283fd0a558SYan, Zheng 20293fd0a558SYan, Zheng if (next->new_bytenr != root->node->start) { 20303fd0a558SYan, Zheng BUG_ON(next->new_bytenr); 20313fd0a558SYan, Zheng BUG_ON(!list_empty(&next->list)); 20323fd0a558SYan, Zheng next->new_bytenr = root->node->start; 203300246528SJosef Bacik btrfs_put_root(next->root); 203400246528SJosef Bacik next->root = btrfs_grab_root(root); 20350b530bc5SJosef Bacik ASSERT(next->root); 20363fd0a558SYan, Zheng list_add_tail(&next->list, 20373fd0a558SYan, Zheng &rc->backref_cache.changed); 20389569cc20SQu Wenruo mark_block_processed(rc, next); 20395d4f98a2SYan Zheng break; 20405d4f98a2SYan Zheng } 20415d4f98a2SYan Zheng 20423fd0a558SYan, Zheng WARN_ON(1); 20435d4f98a2SYan Zheng root = NULL; 20445d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 20455d4f98a2SYan Zheng if (!next || next->level <= node->level) 20465d4f98a2SYan Zheng break; 20475d4f98a2SYan Zheng } 20483fd0a558SYan, Zheng if (!root) 20493fd0a558SYan, Zheng return NULL; 20505d4f98a2SYan Zheng 20513fd0a558SYan, Zheng next = node; 20523fd0a558SYan, Zheng /* setup backref node path for btrfs_reloc_cow_block */ 20533fd0a558SYan, Zheng while (1) { 20543fd0a558SYan, Zheng rc->backref_cache.path[next->level] = next; 20553fd0a558SYan, Zheng if (--index < 0) 20563fd0a558SYan, Zheng break; 20573fd0a558SYan, Zheng next = edges[index]->node[UPPER]; 20583fd0a558SYan, Zheng } 20595d4f98a2SYan Zheng return root; 20605d4f98a2SYan Zheng } 20615d4f98a2SYan Zheng 20623fd0a558SYan, Zheng /* 206392a7cc42SQu Wenruo * Select a tree root for relocation. 206492a7cc42SQu Wenruo * 206592a7cc42SQu Wenruo * Return NULL if the block is not shareable. We should use do_relocation() in 206692a7cc42SQu Wenruo * this case. 206792a7cc42SQu Wenruo * 206892a7cc42SQu Wenruo * Return a tree root pointer if the block is shareable. 206992a7cc42SQu Wenruo * Return -ENOENT if the block is root of reloc tree. 20703fd0a558SYan, Zheng */ 20715d4f98a2SYan Zheng static noinline_for_stack 2072a26195a5SQu Wenruo struct btrfs_root *select_one_root(struct btrfs_backref_node *node) 20735d4f98a2SYan Zheng { 2074a26195a5SQu Wenruo struct btrfs_backref_node *next; 20753fd0a558SYan, Zheng struct btrfs_root *root; 20763fd0a558SYan, Zheng struct btrfs_root *fs_root = NULL; 2077a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 20783fd0a558SYan, Zheng int index = 0; 20793fd0a558SYan, Zheng 20803fd0a558SYan, Zheng next = node; 20813fd0a558SYan, Zheng while (1) { 20823fd0a558SYan, Zheng cond_resched(); 20833fd0a558SYan, Zheng next = walk_up_backref(next, edges, &index); 20843fd0a558SYan, Zheng root = next->root; 20853fd0a558SYan, Zheng BUG_ON(!root); 20863fd0a558SYan, Zheng 208792a7cc42SQu Wenruo /* No other choice for non-shareable tree */ 208892a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 20893fd0a558SYan, Zheng return root; 20903fd0a558SYan, Zheng 20913fd0a558SYan, Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) 20923fd0a558SYan, Zheng fs_root = root; 20933fd0a558SYan, Zheng 20943fd0a558SYan, Zheng if (next != node) 20953fd0a558SYan, Zheng return NULL; 20963fd0a558SYan, Zheng 20973fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 20983fd0a558SYan, Zheng if (!next || next->level <= node->level) 20993fd0a558SYan, Zheng break; 21003fd0a558SYan, Zheng } 21013fd0a558SYan, Zheng 21023fd0a558SYan, Zheng if (!fs_root) 21033fd0a558SYan, Zheng return ERR_PTR(-ENOENT); 21043fd0a558SYan, Zheng return fs_root; 21055d4f98a2SYan Zheng } 21065d4f98a2SYan Zheng 21075d4f98a2SYan Zheng static noinline_for_stack 21083fd0a558SYan, Zheng u64 calcu_metadata_size(struct reloc_control *rc, 2109a26195a5SQu Wenruo struct btrfs_backref_node *node, int reserve) 21105d4f98a2SYan Zheng { 21110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2112a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2113a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2114a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 21153fd0a558SYan, Zheng u64 num_bytes = 0; 21163fd0a558SYan, Zheng int index = 0; 21175d4f98a2SYan Zheng 21183fd0a558SYan, Zheng BUG_ON(reserve && node->processed); 21193fd0a558SYan, Zheng 21203fd0a558SYan, Zheng while (next) { 21213fd0a558SYan, Zheng cond_resched(); 21225d4f98a2SYan Zheng while (1) { 21233fd0a558SYan, Zheng if (next->processed && (reserve || next != node)) 21245d4f98a2SYan Zheng break; 21255d4f98a2SYan Zheng 21260b246afaSJeff Mahoney num_bytes += fs_info->nodesize; 21273fd0a558SYan, Zheng 21283fd0a558SYan, Zheng if (list_empty(&next->upper)) 21293fd0a558SYan, Zheng break; 21303fd0a558SYan, Zheng 21313fd0a558SYan, Zheng edge = list_entry(next->upper.next, 2132a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 21333fd0a558SYan, Zheng edges[index++] = edge; 21343fd0a558SYan, Zheng next = edge->node[UPPER]; 21355d4f98a2SYan Zheng } 21363fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 21373fd0a558SYan, Zheng } 21383fd0a558SYan, Zheng return num_bytes; 21393fd0a558SYan, Zheng } 21403fd0a558SYan, Zheng 21413fd0a558SYan, Zheng static int reserve_metadata_space(struct btrfs_trans_handle *trans, 21423fd0a558SYan, Zheng struct reloc_control *rc, 2143a26195a5SQu Wenruo struct btrfs_backref_node *node) 21443fd0a558SYan, Zheng { 21453fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 2146da17066cSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 21473fd0a558SYan, Zheng u64 num_bytes; 21483fd0a558SYan, Zheng int ret; 21490647bf56SWang Shilong u64 tmp; 21503fd0a558SYan, Zheng 21513fd0a558SYan, Zheng num_bytes = calcu_metadata_size(rc, node, 1) * 2; 21523fd0a558SYan, Zheng 21533fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 21540647bf56SWang Shilong rc->reserved_bytes += num_bytes; 21558ca17f0fSJosef Bacik 21568ca17f0fSJosef Bacik /* 21578ca17f0fSJosef Bacik * We are under a transaction here so we can only do limited flushing. 21588ca17f0fSJosef Bacik * If we get an enospc just kick back -EAGAIN so we know to drop the 21598ca17f0fSJosef Bacik * transaction and try to refill when we can flush all the things. 21608ca17f0fSJosef Bacik */ 21610647bf56SWang Shilong ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes, 21628ca17f0fSJosef Bacik BTRFS_RESERVE_FLUSH_LIMIT); 21633fd0a558SYan, Zheng if (ret) { 2164da17066cSJeff Mahoney tmp = fs_info->nodesize * RELOCATION_RESERVED_NODES; 21650647bf56SWang Shilong while (tmp <= rc->reserved_bytes) 21660647bf56SWang Shilong tmp <<= 1; 21670647bf56SWang Shilong /* 21680647bf56SWang Shilong * only one thread can access block_rsv at this point, 21690647bf56SWang Shilong * so we don't need hold lock to protect block_rsv. 21700647bf56SWang Shilong * we expand more reservation size here to allow enough 217152042d8eSAndrea Gelmini * space for relocation and we will return earlier in 21720647bf56SWang Shilong * enospc case. 21730647bf56SWang Shilong */ 2174da17066cSJeff Mahoney rc->block_rsv->size = tmp + fs_info->nodesize * 21750647bf56SWang Shilong RELOCATION_RESERVED_NODES; 21768ca17f0fSJosef Bacik return -EAGAIN; 21773fd0a558SYan, Zheng } 21783fd0a558SYan, Zheng 21793fd0a558SYan, Zheng return 0; 21803fd0a558SYan, Zheng } 21813fd0a558SYan, Zheng 21825d4f98a2SYan Zheng /* 21835d4f98a2SYan Zheng * relocate a block tree, and then update pointers in upper level 21845d4f98a2SYan Zheng * blocks that reference the block to point to the new location. 21855d4f98a2SYan Zheng * 21865d4f98a2SYan Zheng * if called by link_to_upper, the block has already been relocated. 21875d4f98a2SYan Zheng * in that case this function just updates pointers. 21885d4f98a2SYan Zheng */ 21895d4f98a2SYan Zheng static int do_relocation(struct btrfs_trans_handle *trans, 21903fd0a558SYan, Zheng struct reloc_control *rc, 2191a26195a5SQu Wenruo struct btrfs_backref_node *node, 21925d4f98a2SYan Zheng struct btrfs_key *key, 21935d4f98a2SYan Zheng struct btrfs_path *path, int lowest) 21945d4f98a2SYan Zheng { 21952ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2196a26195a5SQu Wenruo struct btrfs_backref_node *upper; 2197a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2198a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 21995d4f98a2SYan Zheng struct btrfs_root *root; 22005d4f98a2SYan Zheng struct extent_buffer *eb; 22015d4f98a2SYan Zheng u32 blocksize; 22025d4f98a2SYan Zheng u64 bytenr; 22035d4f98a2SYan Zheng u64 generation; 22045d4f98a2SYan Zheng int slot; 22055d4f98a2SYan Zheng int ret; 22065d4f98a2SYan Zheng int err = 0; 22075d4f98a2SYan Zheng 22085d4f98a2SYan Zheng BUG_ON(lowest && node->eb); 22095d4f98a2SYan Zheng 22105d4f98a2SYan Zheng path->lowest_level = node->level + 1; 22113fd0a558SYan, Zheng rc->backref_cache.path[node->level] = node; 22125d4f98a2SYan Zheng list_for_each_entry(edge, &node->upper, list[LOWER]) { 2213581c1760SQu Wenruo struct btrfs_key first_key; 221482fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 2215581c1760SQu Wenruo 22165d4f98a2SYan Zheng cond_resched(); 22175d4f98a2SYan Zheng 22185d4f98a2SYan Zheng upper = edge->node[UPPER]; 2219dc4103f9SWang Shilong root = select_reloc_root(trans, rc, upper, edges); 22203fd0a558SYan, Zheng BUG_ON(!root); 22215d4f98a2SYan Zheng 22223fd0a558SYan, Zheng if (upper->eb && !upper->locked) { 22233fd0a558SYan, Zheng if (!lowest) { 2224e3b83361SQu Wenruo ret = btrfs_bin_search(upper->eb, key, &slot); 2225cbca7d59SFilipe Manana if (ret < 0) { 2226cbca7d59SFilipe Manana err = ret; 2227cbca7d59SFilipe Manana goto next; 2228cbca7d59SFilipe Manana } 22293fd0a558SYan, Zheng BUG_ON(ret); 22303fd0a558SYan, Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 22313fd0a558SYan, Zheng if (node->eb->start == bytenr) 22323fd0a558SYan, Zheng goto next; 22333fd0a558SYan, Zheng } 2234b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 22353fd0a558SYan, Zheng } 22365d4f98a2SYan Zheng 22375d4f98a2SYan Zheng if (!upper->eb) { 22385d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 22393561b9dbSLiu Bo if (ret) { 22403561b9dbSLiu Bo if (ret < 0) 22415d4f98a2SYan Zheng err = ret; 22423561b9dbSLiu Bo else 22433561b9dbSLiu Bo err = -ENOENT; 22443561b9dbSLiu Bo 22453561b9dbSLiu Bo btrfs_release_path(path); 22465d4f98a2SYan Zheng break; 22475d4f98a2SYan Zheng } 22485d4f98a2SYan Zheng 22493fd0a558SYan, Zheng if (!upper->eb) { 22503fd0a558SYan, Zheng upper->eb = path->nodes[upper->level]; 22513fd0a558SYan, Zheng path->nodes[upper->level] = NULL; 22523fd0a558SYan, Zheng } else { 22533fd0a558SYan, Zheng BUG_ON(upper->eb != path->nodes[upper->level]); 22543fd0a558SYan, Zheng } 22553fd0a558SYan, Zheng 22563fd0a558SYan, Zheng upper->locked = 1; 22573fd0a558SYan, Zheng path->locks[upper->level] = 0; 22583fd0a558SYan, Zheng 22595d4f98a2SYan Zheng slot = path->slots[upper->level]; 2260b3b4aa74SDavid Sterba btrfs_release_path(path); 22615d4f98a2SYan Zheng } else { 2262e3b83361SQu Wenruo ret = btrfs_bin_search(upper->eb, key, &slot); 2263cbca7d59SFilipe Manana if (ret < 0) { 2264cbca7d59SFilipe Manana err = ret; 2265cbca7d59SFilipe Manana goto next; 2266cbca7d59SFilipe Manana } 22675d4f98a2SYan Zheng BUG_ON(ret); 22685d4f98a2SYan Zheng } 22695d4f98a2SYan Zheng 22705d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 22713fd0a558SYan, Zheng if (lowest) { 22724547f4d8SLiu Bo if (bytenr != node->bytenr) { 22734547f4d8SLiu Bo btrfs_err(root->fs_info, 22744547f4d8SLiu Bo "lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu", 22754547f4d8SLiu Bo bytenr, node->bytenr, slot, 22764547f4d8SLiu Bo upper->eb->start); 22774547f4d8SLiu Bo err = -EIO; 22784547f4d8SLiu Bo goto next; 22794547f4d8SLiu Bo } 22805d4f98a2SYan Zheng } else { 22813fd0a558SYan, Zheng if (node->eb->start == bytenr) 22823fd0a558SYan, Zheng goto next; 22835d4f98a2SYan Zheng } 22845d4f98a2SYan Zheng 2285da17066cSJeff Mahoney blocksize = root->fs_info->nodesize; 22865d4f98a2SYan Zheng generation = btrfs_node_ptr_generation(upper->eb, slot); 2287581c1760SQu Wenruo btrfs_node_key_to_cpu(upper->eb, &first_key, slot); 2288581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, generation, 2289581c1760SQu Wenruo upper->level - 1, &first_key); 229064c043deSLiu Bo if (IS_ERR(eb)) { 229164c043deSLiu Bo err = PTR_ERR(eb); 229264c043deSLiu Bo goto next; 229364c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2294416bc658SJosef Bacik free_extent_buffer(eb); 229597d9a8a4STsutomu Itoh err = -EIO; 229697d9a8a4STsutomu Itoh goto next; 229797d9a8a4STsutomu Itoh } 22985d4f98a2SYan Zheng btrfs_tree_lock(eb); 22998bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 23005d4f98a2SYan Zheng 23015d4f98a2SYan Zheng if (!node->eb) { 23025d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, eb, upper->eb, 23035d4f98a2SYan Zheng slot, &eb); 23043fd0a558SYan, Zheng btrfs_tree_unlock(eb); 23053fd0a558SYan, Zheng free_extent_buffer(eb); 23065d4f98a2SYan Zheng if (ret < 0) { 23075d4f98a2SYan Zheng err = ret; 23083fd0a558SYan, Zheng goto next; 23095d4f98a2SYan Zheng } 23103fd0a558SYan, Zheng BUG_ON(node->eb != eb); 23115d4f98a2SYan Zheng } else { 23125d4f98a2SYan Zheng btrfs_set_node_blockptr(upper->eb, slot, 23135d4f98a2SYan Zheng node->eb->start); 23145d4f98a2SYan Zheng btrfs_set_node_ptr_generation(upper->eb, slot, 23155d4f98a2SYan Zheng trans->transid); 23165d4f98a2SYan Zheng btrfs_mark_buffer_dirty(upper->eb); 23175d4f98a2SYan Zheng 231882fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, 23195d4f98a2SYan Zheng node->eb->start, blocksize, 232082fa113fSQu Wenruo upper->eb->start); 232182fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 232282fa113fSQu Wenruo btrfs_init_tree_ref(&ref, node->level, 232382fa113fSQu Wenruo btrfs_header_owner(upper->eb)); 232482fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 23255d4f98a2SYan Zheng BUG_ON(ret); 23265d4f98a2SYan Zheng 23275d4f98a2SYan Zheng ret = btrfs_drop_subtree(trans, root, eb, upper->eb); 23285d4f98a2SYan Zheng BUG_ON(ret); 23295d4f98a2SYan Zheng } 23303fd0a558SYan, Zheng next: 23313fd0a558SYan, Zheng if (!upper->pending) 2332b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 23333fd0a558SYan, Zheng else 2334b0fe7078SQu Wenruo btrfs_backref_unlock_node_buffer(upper); 23353fd0a558SYan, Zheng if (err) 23363fd0a558SYan, Zheng break; 23375d4f98a2SYan Zheng } 23383fd0a558SYan, Zheng 23393fd0a558SYan, Zheng if (!err && node->pending) { 2340b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 23413fd0a558SYan, Zheng list_move_tail(&node->list, &rc->backref_cache.changed); 23423fd0a558SYan, Zheng node->pending = 0; 23435d4f98a2SYan Zheng } 23443fd0a558SYan, Zheng 23455d4f98a2SYan Zheng path->lowest_level = 0; 23463fd0a558SYan, Zheng BUG_ON(err == -ENOSPC); 23475d4f98a2SYan Zheng return err; 23485d4f98a2SYan Zheng } 23495d4f98a2SYan Zheng 23505d4f98a2SYan Zheng static int link_to_upper(struct btrfs_trans_handle *trans, 23513fd0a558SYan, Zheng struct reloc_control *rc, 2352a26195a5SQu Wenruo struct btrfs_backref_node *node, 23535d4f98a2SYan Zheng struct btrfs_path *path) 23545d4f98a2SYan Zheng { 23555d4f98a2SYan Zheng struct btrfs_key key; 23565d4f98a2SYan Zheng 23575d4f98a2SYan Zheng btrfs_node_key_to_cpu(node->eb, &key, 0); 23583fd0a558SYan, Zheng return do_relocation(trans, rc, node, &key, path, 0); 23595d4f98a2SYan Zheng } 23605d4f98a2SYan Zheng 23615d4f98a2SYan Zheng static int finish_pending_nodes(struct btrfs_trans_handle *trans, 23623fd0a558SYan, Zheng struct reloc_control *rc, 23633fd0a558SYan, Zheng struct btrfs_path *path, int err) 23645d4f98a2SYan Zheng { 23653fd0a558SYan, Zheng LIST_HEAD(list); 2366a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 2367a26195a5SQu Wenruo struct btrfs_backref_node *node; 23685d4f98a2SYan Zheng int level; 23695d4f98a2SYan Zheng int ret; 23705d4f98a2SYan Zheng 23715d4f98a2SYan Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 23725d4f98a2SYan Zheng while (!list_empty(&cache->pending[level])) { 23735d4f98a2SYan Zheng node = list_entry(cache->pending[level].next, 2374a26195a5SQu Wenruo struct btrfs_backref_node, list); 23753fd0a558SYan, Zheng list_move_tail(&node->list, &list); 23763fd0a558SYan, Zheng BUG_ON(!node->pending); 23775d4f98a2SYan Zheng 23783fd0a558SYan, Zheng if (!err) { 23793fd0a558SYan, Zheng ret = link_to_upper(trans, rc, node, path); 23805d4f98a2SYan Zheng if (ret < 0) 23815d4f98a2SYan Zheng err = ret; 23825d4f98a2SYan Zheng } 23835d4f98a2SYan Zheng } 23843fd0a558SYan, Zheng list_splice_init(&list, &cache->pending[level]); 23853fd0a558SYan, Zheng } 23865d4f98a2SYan Zheng return err; 23875d4f98a2SYan Zheng } 23885d4f98a2SYan Zheng 23895d4f98a2SYan Zheng /* 23905d4f98a2SYan Zheng * mark a block and all blocks directly/indirectly reference the block 23915d4f98a2SYan Zheng * as processed. 23925d4f98a2SYan Zheng */ 23935d4f98a2SYan Zheng static void update_processed_blocks(struct reloc_control *rc, 2394a26195a5SQu Wenruo struct btrfs_backref_node *node) 23955d4f98a2SYan Zheng { 2396a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2397a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2398a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 23995d4f98a2SYan Zheng int index = 0; 24005d4f98a2SYan Zheng 24015d4f98a2SYan Zheng while (next) { 24025d4f98a2SYan Zheng cond_resched(); 24035d4f98a2SYan Zheng while (1) { 24045d4f98a2SYan Zheng if (next->processed) 24055d4f98a2SYan Zheng break; 24065d4f98a2SYan Zheng 24079569cc20SQu Wenruo mark_block_processed(rc, next); 24085d4f98a2SYan Zheng 24095d4f98a2SYan Zheng if (list_empty(&next->upper)) 24105d4f98a2SYan Zheng break; 24115d4f98a2SYan Zheng 24125d4f98a2SYan Zheng edge = list_entry(next->upper.next, 2413a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 24145d4f98a2SYan Zheng edges[index++] = edge; 24155d4f98a2SYan Zheng next = edge->node[UPPER]; 24165d4f98a2SYan Zheng } 24175d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 24185d4f98a2SYan Zheng } 24195d4f98a2SYan Zheng } 24205d4f98a2SYan Zheng 24217476dfdaSDavid Sterba static int tree_block_processed(u64 bytenr, struct reloc_control *rc) 24225d4f98a2SYan Zheng { 2423da17066cSJeff Mahoney u32 blocksize = rc->extent_root->fs_info->nodesize; 24247476dfdaSDavid Sterba 24255d4f98a2SYan Zheng if (test_range_bit(&rc->processed_blocks, bytenr, 24269655d298SChris Mason bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) 24275d4f98a2SYan Zheng return 1; 24285d4f98a2SYan Zheng return 0; 24295d4f98a2SYan Zheng } 24305d4f98a2SYan Zheng 24312ff7e61eSJeff Mahoney static int get_tree_block_key(struct btrfs_fs_info *fs_info, 24325d4f98a2SYan Zheng struct tree_block *block) 24335d4f98a2SYan Zheng { 24345d4f98a2SYan Zheng struct extent_buffer *eb; 24355d4f98a2SYan Zheng 2436581c1760SQu Wenruo eb = read_tree_block(fs_info, block->bytenr, block->key.offset, 2437581c1760SQu Wenruo block->level, NULL); 243864c043deSLiu Bo if (IS_ERR(eb)) { 243964c043deSLiu Bo return PTR_ERR(eb); 244064c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2441416bc658SJosef Bacik free_extent_buffer(eb); 2442416bc658SJosef Bacik return -EIO; 2443416bc658SJosef Bacik } 24445d4f98a2SYan Zheng if (block->level == 0) 24455d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &block->key, 0); 24465d4f98a2SYan Zheng else 24475d4f98a2SYan Zheng btrfs_node_key_to_cpu(eb, &block->key, 0); 24485d4f98a2SYan Zheng free_extent_buffer(eb); 24495d4f98a2SYan Zheng block->key_ready = 1; 24505d4f98a2SYan Zheng return 0; 24515d4f98a2SYan Zheng } 24525d4f98a2SYan Zheng 24535d4f98a2SYan Zheng /* 24545d4f98a2SYan Zheng * helper function to relocate a tree block 24555d4f98a2SYan Zheng */ 24565d4f98a2SYan Zheng static int relocate_tree_block(struct btrfs_trans_handle *trans, 24575d4f98a2SYan Zheng struct reloc_control *rc, 2458a26195a5SQu Wenruo struct btrfs_backref_node *node, 24595d4f98a2SYan Zheng struct btrfs_key *key, 24605d4f98a2SYan Zheng struct btrfs_path *path) 24615d4f98a2SYan Zheng { 24625d4f98a2SYan Zheng struct btrfs_root *root; 24633fd0a558SYan, Zheng int ret = 0; 24645d4f98a2SYan Zheng 24653fd0a558SYan, Zheng if (!node) 24665d4f98a2SYan Zheng return 0; 24673fd0a558SYan, Zheng 24685f6b2e5cSJosef Bacik /* 24695f6b2e5cSJosef Bacik * If we fail here we want to drop our backref_node because we are going 24705f6b2e5cSJosef Bacik * to start over and regenerate the tree for it. 24715f6b2e5cSJosef Bacik */ 24725f6b2e5cSJosef Bacik ret = reserve_metadata_space(trans, rc, node); 24735f6b2e5cSJosef Bacik if (ret) 24745f6b2e5cSJosef Bacik goto out; 24755f6b2e5cSJosef Bacik 24763fd0a558SYan, Zheng BUG_ON(node->processed); 2477147d256eSZhaolei root = select_one_root(node); 24783fd0a558SYan, Zheng if (root == ERR_PTR(-ENOENT)) { 24793fd0a558SYan, Zheng update_processed_blocks(rc, node); 24803fd0a558SYan, Zheng goto out; 24815d4f98a2SYan Zheng } 24825d4f98a2SYan Zheng 24833fd0a558SYan, Zheng if (root) { 248492a7cc42SQu Wenruo if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) { 24853fd0a558SYan, Zheng BUG_ON(node->new_bytenr); 24863fd0a558SYan, Zheng BUG_ON(!list_empty(&node->list)); 24873fd0a558SYan, Zheng btrfs_record_root_in_trans(trans, root); 24883fd0a558SYan, Zheng root = root->reloc_root; 24893fd0a558SYan, Zheng node->new_bytenr = root->node->start; 249000246528SJosef Bacik btrfs_put_root(node->root); 249100246528SJosef Bacik node->root = btrfs_grab_root(root); 24920b530bc5SJosef Bacik ASSERT(node->root); 24933fd0a558SYan, Zheng list_add_tail(&node->list, &rc->backref_cache.changed); 24943fd0a558SYan, Zheng } else { 24955d4f98a2SYan Zheng path->lowest_level = node->level; 24965d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 2497b3b4aa74SDavid Sterba btrfs_release_path(path); 24983fd0a558SYan, Zheng if (ret > 0) 24995d4f98a2SYan Zheng ret = 0; 25003fd0a558SYan, Zheng } 25013fd0a558SYan, Zheng if (!ret) 25023fd0a558SYan, Zheng update_processed_blocks(rc, node); 25033fd0a558SYan, Zheng } else { 25043fd0a558SYan, Zheng ret = do_relocation(trans, rc, node, key, path, 1); 25053fd0a558SYan, Zheng } 25065d4f98a2SYan Zheng out: 25070647bf56SWang Shilong if (ret || node->level == 0 || node->cowonly) 2508023acb07SQu Wenruo btrfs_backref_cleanup_node(&rc->backref_cache, node); 25095d4f98a2SYan Zheng return ret; 25105d4f98a2SYan Zheng } 25115d4f98a2SYan Zheng 25125d4f98a2SYan Zheng /* 25135d4f98a2SYan Zheng * relocate a list of blocks 25145d4f98a2SYan Zheng */ 25155d4f98a2SYan Zheng static noinline_for_stack 25165d4f98a2SYan Zheng int relocate_tree_blocks(struct btrfs_trans_handle *trans, 25175d4f98a2SYan Zheng struct reloc_control *rc, struct rb_root *blocks) 25185d4f98a2SYan Zheng { 25192ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2520a26195a5SQu Wenruo struct btrfs_backref_node *node; 25215d4f98a2SYan Zheng struct btrfs_path *path; 25225d4f98a2SYan Zheng struct tree_block *block; 252398ff7b94SQu Wenruo struct tree_block *next; 25245d4f98a2SYan Zheng int ret; 25255d4f98a2SYan Zheng int err = 0; 25265d4f98a2SYan Zheng 25275d4f98a2SYan Zheng path = btrfs_alloc_path(); 2528e1a12670SLiu Bo if (!path) { 2529e1a12670SLiu Bo err = -ENOMEM; 253034c2b290SDavid Sterba goto out_free_blocks; 2531e1a12670SLiu Bo } 25325d4f98a2SYan Zheng 253398ff7b94SQu Wenruo /* Kick in readahead for tree blocks with missing keys */ 253498ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 25355d4f98a2SYan Zheng if (!block->key_ready) 25362ff7e61eSJeff Mahoney readahead_tree_block(fs_info, block->bytenr); 25375d4f98a2SYan Zheng } 25385d4f98a2SYan Zheng 253998ff7b94SQu Wenruo /* Get first keys */ 254098ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 254134c2b290SDavid Sterba if (!block->key_ready) { 25422ff7e61eSJeff Mahoney err = get_tree_block_key(fs_info, block); 254334c2b290SDavid Sterba if (err) 254434c2b290SDavid Sterba goto out_free_path; 254534c2b290SDavid Sterba } 25465d4f98a2SYan Zheng } 25475d4f98a2SYan Zheng 254898ff7b94SQu Wenruo /* Do tree relocation */ 254998ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 25503fd0a558SYan, Zheng node = build_backref_tree(rc, &block->key, 25515d4f98a2SYan Zheng block->level, block->bytenr); 25525d4f98a2SYan Zheng if (IS_ERR(node)) { 25535d4f98a2SYan Zheng err = PTR_ERR(node); 25545d4f98a2SYan Zheng goto out; 25555d4f98a2SYan Zheng } 25565d4f98a2SYan Zheng 25575d4f98a2SYan Zheng ret = relocate_tree_block(trans, rc, node, &block->key, 25585d4f98a2SYan Zheng path); 25595d4f98a2SYan Zheng if (ret < 0) { 25605d4f98a2SYan Zheng err = ret; 256150dbbb71SJosef Bacik break; 25625d4f98a2SYan Zheng } 25635d4f98a2SYan Zheng } 25645d4f98a2SYan Zheng out: 25653fd0a558SYan, Zheng err = finish_pending_nodes(trans, rc, path, err); 25665d4f98a2SYan Zheng 256734c2b290SDavid Sterba out_free_path: 25685d4f98a2SYan Zheng btrfs_free_path(path); 256934c2b290SDavid Sterba out_free_blocks: 2570e1a12670SLiu Bo free_block_list(blocks); 25715d4f98a2SYan Zheng return err; 25725d4f98a2SYan Zheng } 25735d4f98a2SYan Zheng 25745d4f98a2SYan Zheng static noinline_for_stack 2575efa56464SYan, Zheng int prealloc_file_extent_cluster(struct inode *inode, 2576efa56464SYan, Zheng struct file_extent_cluster *cluster) 2577efa56464SYan, Zheng { 2578efa56464SYan, Zheng u64 alloc_hint = 0; 2579efa56464SYan, Zheng u64 start; 2580efa56464SYan, Zheng u64 end; 2581efa56464SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 2582efa56464SYan, Zheng u64 num_bytes; 2583*4e9d0d01SNikolay Borisov int nr; 2584efa56464SYan, Zheng int ret = 0; 2585dcb40c19SWang Xiaoguang u64 prealloc_start = cluster->start - offset; 2586dcb40c19SWang Xiaoguang u64 prealloc_end = cluster->end - offset; 2587214e61d0SNikolay Borisov u64 cur_offset = prealloc_start; 2588efa56464SYan, Zheng 2589efa56464SYan, Zheng BUG_ON(cluster->start != cluster->boundary[0]); 2590a89ef455SFilipe Manana ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), 2591dcb40c19SWang Xiaoguang prealloc_end + 1 - prealloc_start); 2592efa56464SYan, Zheng if (ret) 2593214e61d0SNikolay Borisov return ret; 2594efa56464SYan, Zheng 2595214e61d0SNikolay Borisov inode_lock(inode); 2596*4e9d0d01SNikolay Borisov for (nr = 0; nr < cluster->nr; nr++) { 2597efa56464SYan, Zheng start = cluster->boundary[nr] - offset; 2598efa56464SYan, Zheng if (nr + 1 < cluster->nr) 2599efa56464SYan, Zheng end = cluster->boundary[nr + 1] - 1 - offset; 2600efa56464SYan, Zheng else 2601efa56464SYan, Zheng end = cluster->end - offset; 2602efa56464SYan, Zheng 2603d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 2604efa56464SYan, Zheng num_bytes = end + 1 - start; 2605efa56464SYan, Zheng ret = btrfs_prealloc_file_range(inode, 0, start, 2606efa56464SYan, Zheng num_bytes, num_bytes, 2607efa56464SYan, Zheng end + 1, &alloc_hint); 260818513091SWang Xiaoguang cur_offset = end + 1; 2609d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 2610efa56464SYan, Zheng if (ret) 2611efa56464SYan, Zheng break; 2612efa56464SYan, Zheng } 2613214e61d0SNikolay Borisov inode_unlock(inode); 2614214e61d0SNikolay Borisov 261518513091SWang Xiaoguang if (cur_offset < prealloc_end) 2616a89ef455SFilipe Manana btrfs_free_reserved_data_space_noquota(inode, 2617a89ef455SFilipe Manana prealloc_end + 1 - cur_offset); 2618efa56464SYan, Zheng return ret; 2619efa56464SYan, Zheng } 2620efa56464SYan, Zheng 2621efa56464SYan, Zheng static noinline_for_stack 26220257bb82SYan, Zheng int setup_extent_mapping(struct inode *inode, u64 start, u64 end, 26230257bb82SYan, Zheng u64 block_start) 26245d4f98a2SYan Zheng { 26255d4f98a2SYan Zheng struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 26265d4f98a2SYan Zheng struct extent_map *em; 26270257bb82SYan, Zheng int ret = 0; 26285d4f98a2SYan Zheng 2629172ddd60SDavid Sterba em = alloc_extent_map(); 26300257bb82SYan, Zheng if (!em) 26310257bb82SYan, Zheng return -ENOMEM; 26320257bb82SYan, Zheng 26335d4f98a2SYan Zheng em->start = start; 26340257bb82SYan, Zheng em->len = end + 1 - start; 26350257bb82SYan, Zheng em->block_len = em->len; 26360257bb82SYan, Zheng em->block_start = block_start; 26375d4f98a2SYan Zheng set_bit(EXTENT_FLAG_PINNED, &em->flags); 26385d4f98a2SYan Zheng 2639d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 26405d4f98a2SYan Zheng while (1) { 2641890871beSChris Mason write_lock(&em_tree->lock); 264209a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 2643890871beSChris Mason write_unlock(&em_tree->lock); 26445d4f98a2SYan Zheng if (ret != -EEXIST) { 26455d4f98a2SYan Zheng free_extent_map(em); 26465d4f98a2SYan Zheng break; 26475d4f98a2SYan Zheng } 2648dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0); 26495d4f98a2SYan Zheng } 2650d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 26510257bb82SYan, Zheng return ret; 26520257bb82SYan, Zheng } 26535d4f98a2SYan Zheng 2654726a3421SQu Wenruo /* 2655726a3421SQu Wenruo * Allow error injection to test balance cancellation 2656726a3421SQu Wenruo */ 2657726a3421SQu Wenruo int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info) 2658726a3421SQu Wenruo { 2659726a3421SQu Wenruo return atomic_read(&fs_info->balance_cancel_req); 2660726a3421SQu Wenruo } 2661726a3421SQu Wenruo ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE); 2662726a3421SQu Wenruo 26630257bb82SYan, Zheng static int relocate_file_extent_cluster(struct inode *inode, 26640257bb82SYan, Zheng struct file_extent_cluster *cluster) 26650257bb82SYan, Zheng { 26662ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26670257bb82SYan, Zheng u64 page_start; 26680257bb82SYan, Zheng u64 page_end; 26690257bb82SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 26700257bb82SYan, Zheng unsigned long index; 26710257bb82SYan, Zheng unsigned long last_index; 26720257bb82SYan, Zheng struct page *page; 26730257bb82SYan, Zheng struct file_ra_state *ra; 26743b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 26750257bb82SYan, Zheng int nr = 0; 26760257bb82SYan, Zheng int ret = 0; 26770257bb82SYan, Zheng 26780257bb82SYan, Zheng if (!cluster->nr) 26790257bb82SYan, Zheng return 0; 26800257bb82SYan, Zheng 26810257bb82SYan, Zheng ra = kzalloc(sizeof(*ra), GFP_NOFS); 26820257bb82SYan, Zheng if (!ra) 26830257bb82SYan, Zheng return -ENOMEM; 26840257bb82SYan, Zheng 2685efa56464SYan, Zheng ret = prealloc_file_extent_cluster(inode, cluster); 26860257bb82SYan, Zheng if (ret) 2687efa56464SYan, Zheng goto out; 26880257bb82SYan, Zheng 26890257bb82SYan, Zheng file_ra_state_init(ra, inode->i_mapping); 26900257bb82SYan, Zheng 2691efa56464SYan, Zheng ret = setup_extent_mapping(inode, cluster->start - offset, 2692efa56464SYan, Zheng cluster->end - offset, cluster->start); 2693efa56464SYan, Zheng if (ret) 2694efa56464SYan, Zheng goto out; 2695efa56464SYan, Zheng 269609cbfeafSKirill A. Shutemov index = (cluster->start - offset) >> PAGE_SHIFT; 269709cbfeafSKirill A. Shutemov last_index = (cluster->end - offset) >> PAGE_SHIFT; 26980257bb82SYan, Zheng while (index <= last_index) { 26999f3db423SNikolay Borisov ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), 27009f3db423SNikolay Borisov PAGE_SIZE); 2701efa56464SYan, Zheng if (ret) 2702efa56464SYan, Zheng goto out; 2703efa56464SYan, Zheng 27040257bb82SYan, Zheng page = find_lock_page(inode->i_mapping, index); 27050257bb82SYan, Zheng if (!page) { 27060257bb82SYan, Zheng page_cache_sync_readahead(inode->i_mapping, 27070257bb82SYan, Zheng ra, NULL, index, 27080257bb82SYan, Zheng last_index + 1 - index); 2709a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, index, 27103b16a4e3SJosef Bacik mask); 27110257bb82SYan, Zheng if (!page) { 2712691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 271343b18595SQu Wenruo PAGE_SIZE, true); 271444db1216SFilipe Manana btrfs_delalloc_release_extents(BTRFS_I(inode), 27158702ba93SQu Wenruo PAGE_SIZE); 27160257bb82SYan, Zheng ret = -ENOMEM; 2717efa56464SYan, Zheng goto out; 27180257bb82SYan, Zheng } 27190257bb82SYan, Zheng } 27200257bb82SYan, Zheng 27210257bb82SYan, Zheng if (PageReadahead(page)) { 27220257bb82SYan, Zheng page_cache_async_readahead(inode->i_mapping, 27230257bb82SYan, Zheng ra, NULL, page, index, 27240257bb82SYan, Zheng last_index + 1 - index); 27250257bb82SYan, Zheng } 27260257bb82SYan, Zheng 27270257bb82SYan, Zheng if (!PageUptodate(page)) { 27280257bb82SYan, Zheng btrfs_readpage(NULL, page); 27290257bb82SYan, Zheng lock_page(page); 27300257bb82SYan, Zheng if (!PageUptodate(page)) { 27310257bb82SYan, Zheng unlock_page(page); 273209cbfeafSKirill A. Shutemov put_page(page); 2733691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 273443b18595SQu Wenruo PAGE_SIZE, true); 27358b62f87bSJosef Bacik btrfs_delalloc_release_extents(BTRFS_I(inode), 27368702ba93SQu Wenruo PAGE_SIZE); 27370257bb82SYan, Zheng ret = -EIO; 2738efa56464SYan, Zheng goto out; 27390257bb82SYan, Zheng } 27400257bb82SYan, Zheng } 27410257bb82SYan, Zheng 27424eee4fa4SMiao Xie page_start = page_offset(page); 274309cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 27440257bb82SYan, Zheng 2745d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); 27460257bb82SYan, Zheng 27470257bb82SYan, Zheng set_page_extent_mapped(page); 27480257bb82SYan, Zheng 27490257bb82SYan, Zheng if (nr < cluster->nr && 27500257bb82SYan, Zheng page_start + offset == cluster->boundary[nr]) { 27510257bb82SYan, Zheng set_extent_bits(&BTRFS_I(inode)->io_tree, 27520257bb82SYan, Zheng page_start, page_end, 2753ceeb0ae7SDavid Sterba EXTENT_BOUNDARY); 27540257bb82SYan, Zheng nr++; 27550257bb82SYan, Zheng } 27560257bb82SYan, Zheng 2757765f3cebSNikolay Borisov ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0, 2758330a5827SNikolay Borisov NULL); 2759765f3cebSNikolay Borisov if (ret) { 2760765f3cebSNikolay Borisov unlock_page(page); 2761765f3cebSNikolay Borisov put_page(page); 2762765f3cebSNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 276343b18595SQu Wenruo PAGE_SIZE, true); 2764765f3cebSNikolay Borisov btrfs_delalloc_release_extents(BTRFS_I(inode), 27658702ba93SQu Wenruo PAGE_SIZE); 2766765f3cebSNikolay Borisov 2767765f3cebSNikolay Borisov clear_extent_bits(&BTRFS_I(inode)->io_tree, 2768765f3cebSNikolay Borisov page_start, page_end, 2769765f3cebSNikolay Borisov EXTENT_LOCKED | EXTENT_BOUNDARY); 2770765f3cebSNikolay Borisov goto out; 2771765f3cebSNikolay Borisov 2772765f3cebSNikolay Borisov } 27730257bb82SYan, Zheng set_page_dirty(page); 27740257bb82SYan, Zheng 27750257bb82SYan, Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 2776d0082371SJeff Mahoney page_start, page_end); 27770257bb82SYan, Zheng unlock_page(page); 277809cbfeafSKirill A. Shutemov put_page(page); 27790257bb82SYan, Zheng 27800257bb82SYan, Zheng index++; 27818702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE); 2782efa56464SYan, Zheng balance_dirty_pages_ratelimited(inode->i_mapping); 27832ff7e61eSJeff Mahoney btrfs_throttle(fs_info); 27847f913c7cSQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 27857f913c7cSQu Wenruo ret = -ECANCELED; 27867f913c7cSQu Wenruo goto out; 27877f913c7cSQu Wenruo } 27880257bb82SYan, Zheng } 27890257bb82SYan, Zheng WARN_ON(nr != cluster->nr); 2790efa56464SYan, Zheng out: 27910257bb82SYan, Zheng kfree(ra); 27920257bb82SYan, Zheng return ret; 27930257bb82SYan, Zheng } 27940257bb82SYan, Zheng 27950257bb82SYan, Zheng static noinline_for_stack 27960257bb82SYan, Zheng int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, 27970257bb82SYan, Zheng struct file_extent_cluster *cluster) 27980257bb82SYan, Zheng { 27990257bb82SYan, Zheng int ret; 28000257bb82SYan, Zheng 28010257bb82SYan, Zheng if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { 28020257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28030257bb82SYan, Zheng if (ret) 28040257bb82SYan, Zheng return ret; 28050257bb82SYan, Zheng cluster->nr = 0; 28060257bb82SYan, Zheng } 28070257bb82SYan, Zheng 28080257bb82SYan, Zheng if (!cluster->nr) 28090257bb82SYan, Zheng cluster->start = extent_key->objectid; 28100257bb82SYan, Zheng else 28110257bb82SYan, Zheng BUG_ON(cluster->nr >= MAX_EXTENTS); 28120257bb82SYan, Zheng cluster->end = extent_key->objectid + extent_key->offset - 1; 28130257bb82SYan, Zheng cluster->boundary[cluster->nr] = extent_key->objectid; 28140257bb82SYan, Zheng cluster->nr++; 28150257bb82SYan, Zheng 28160257bb82SYan, Zheng if (cluster->nr >= MAX_EXTENTS) { 28170257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28180257bb82SYan, Zheng if (ret) 28190257bb82SYan, Zheng return ret; 28200257bb82SYan, Zheng cluster->nr = 0; 28210257bb82SYan, Zheng } 28220257bb82SYan, Zheng return 0; 28235d4f98a2SYan Zheng } 28245d4f98a2SYan Zheng 28255d4f98a2SYan Zheng /* 28265d4f98a2SYan Zheng * helper to add a tree block to the list. 28275d4f98a2SYan Zheng * the major work is getting the generation and level of the block 28285d4f98a2SYan Zheng */ 28295d4f98a2SYan Zheng static int add_tree_block(struct reloc_control *rc, 28305d4f98a2SYan Zheng struct btrfs_key *extent_key, 28315d4f98a2SYan Zheng struct btrfs_path *path, 28325d4f98a2SYan Zheng struct rb_root *blocks) 28335d4f98a2SYan Zheng { 28345d4f98a2SYan Zheng struct extent_buffer *eb; 28355d4f98a2SYan Zheng struct btrfs_extent_item *ei; 28365d4f98a2SYan Zheng struct btrfs_tree_block_info *bi; 28375d4f98a2SYan Zheng struct tree_block *block; 28385d4f98a2SYan Zheng struct rb_node *rb_node; 28395d4f98a2SYan Zheng u32 item_size; 28405d4f98a2SYan Zheng int level = -1; 28417fdf4b60SWang Shilong u64 generation; 28425d4f98a2SYan Zheng 28435d4f98a2SYan Zheng eb = path->nodes[0]; 28445d4f98a2SYan Zheng item_size = btrfs_item_size_nr(eb, path->slots[0]); 28455d4f98a2SYan Zheng 28463173a18fSJosef Bacik if (extent_key->type == BTRFS_METADATA_ITEM_KEY || 28473173a18fSJosef Bacik item_size >= sizeof(*ei) + sizeof(*bi)) { 28485d4f98a2SYan Zheng ei = btrfs_item_ptr(eb, path->slots[0], 28495d4f98a2SYan Zheng struct btrfs_extent_item); 28503173a18fSJosef Bacik if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { 28515d4f98a2SYan Zheng bi = (struct btrfs_tree_block_info *)(ei + 1); 28525d4f98a2SYan Zheng level = btrfs_tree_block_level(eb, bi); 28535d4f98a2SYan Zheng } else { 28543173a18fSJosef Bacik level = (int)extent_key->offset; 28553173a18fSJosef Bacik } 28563173a18fSJosef Bacik generation = btrfs_extent_generation(eb, ei); 28576d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 2858ba3c2b19SNikolay Borisov btrfs_print_v0_err(eb->fs_info); 2859ba3c2b19SNikolay Borisov btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL); 2860ba3c2b19SNikolay Borisov return -EINVAL; 28613173a18fSJosef Bacik } else { 28625d4f98a2SYan Zheng BUG(); 28635d4f98a2SYan Zheng } 28645d4f98a2SYan Zheng 2865b3b4aa74SDavid Sterba btrfs_release_path(path); 28665d4f98a2SYan Zheng 28675d4f98a2SYan Zheng BUG_ON(level == -1); 28685d4f98a2SYan Zheng 28695d4f98a2SYan Zheng block = kmalloc(sizeof(*block), GFP_NOFS); 28705d4f98a2SYan Zheng if (!block) 28715d4f98a2SYan Zheng return -ENOMEM; 28725d4f98a2SYan Zheng 28735d4f98a2SYan Zheng block->bytenr = extent_key->objectid; 2874da17066cSJeff Mahoney block->key.objectid = rc->extent_root->fs_info->nodesize; 28755d4f98a2SYan Zheng block->key.offset = generation; 28765d4f98a2SYan Zheng block->level = level; 28775d4f98a2SYan Zheng block->key_ready = 0; 28785d4f98a2SYan Zheng 2879e9a28dc5SQu Wenruo rb_node = rb_simple_insert(blocks, block->bytenr, &block->rb_node); 288043c04fb1SJeff Mahoney if (rb_node) 2881982c92cbSQu Wenruo btrfs_backref_panic(rc->extent_root->fs_info, block->bytenr, 2882982c92cbSQu Wenruo -EEXIST); 28835d4f98a2SYan Zheng 28845d4f98a2SYan Zheng return 0; 28855d4f98a2SYan Zheng } 28865d4f98a2SYan Zheng 28875d4f98a2SYan Zheng /* 28885d4f98a2SYan Zheng * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY 28895d4f98a2SYan Zheng */ 28905d4f98a2SYan Zheng static int __add_tree_block(struct reloc_control *rc, 28915d4f98a2SYan Zheng u64 bytenr, u32 blocksize, 28925d4f98a2SYan Zheng struct rb_root *blocks) 28935d4f98a2SYan Zheng { 28940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 28955d4f98a2SYan Zheng struct btrfs_path *path; 28965d4f98a2SYan Zheng struct btrfs_key key; 28975d4f98a2SYan Zheng int ret; 28980b246afaSJeff Mahoney bool skinny = btrfs_fs_incompat(fs_info, SKINNY_METADATA); 28995d4f98a2SYan Zheng 29007476dfdaSDavid Sterba if (tree_block_processed(bytenr, rc)) 29015d4f98a2SYan Zheng return 0; 29025d4f98a2SYan Zheng 2903e9a28dc5SQu Wenruo if (rb_simple_search(blocks, bytenr)) 29045d4f98a2SYan Zheng return 0; 29055d4f98a2SYan Zheng 29065d4f98a2SYan Zheng path = btrfs_alloc_path(); 29075d4f98a2SYan Zheng if (!path) 29085d4f98a2SYan Zheng return -ENOMEM; 2909aee68ee5SJosef Bacik again: 29105d4f98a2SYan Zheng key.objectid = bytenr; 2911aee68ee5SJosef Bacik if (skinny) { 2912aee68ee5SJosef Bacik key.type = BTRFS_METADATA_ITEM_KEY; 2913aee68ee5SJosef Bacik key.offset = (u64)-1; 2914aee68ee5SJosef Bacik } else { 29155d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 29165d4f98a2SYan Zheng key.offset = blocksize; 2917aee68ee5SJosef Bacik } 29185d4f98a2SYan Zheng 29195d4f98a2SYan Zheng path->search_commit_root = 1; 29205d4f98a2SYan Zheng path->skip_locking = 1; 29215d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); 29225d4f98a2SYan Zheng if (ret < 0) 29235d4f98a2SYan Zheng goto out; 29245d4f98a2SYan Zheng 2925aee68ee5SJosef Bacik if (ret > 0 && skinny) { 2926aee68ee5SJosef Bacik if (path->slots[0]) { 2927aee68ee5SJosef Bacik path->slots[0]--; 2928aee68ee5SJosef Bacik btrfs_item_key_to_cpu(path->nodes[0], &key, 2929aee68ee5SJosef Bacik path->slots[0]); 29303173a18fSJosef Bacik if (key.objectid == bytenr && 2931aee68ee5SJosef Bacik (key.type == BTRFS_METADATA_ITEM_KEY || 2932aee68ee5SJosef Bacik (key.type == BTRFS_EXTENT_ITEM_KEY && 2933aee68ee5SJosef Bacik key.offset == blocksize))) 29343173a18fSJosef Bacik ret = 0; 29353173a18fSJosef Bacik } 2936aee68ee5SJosef Bacik 2937aee68ee5SJosef Bacik if (ret) { 2938aee68ee5SJosef Bacik skinny = false; 2939aee68ee5SJosef Bacik btrfs_release_path(path); 2940aee68ee5SJosef Bacik goto again; 2941aee68ee5SJosef Bacik } 2942aee68ee5SJosef Bacik } 2943cdccee99SLiu Bo if (ret) { 2944cdccee99SLiu Bo ASSERT(ret == 1); 2945cdccee99SLiu Bo btrfs_print_leaf(path->nodes[0]); 2946cdccee99SLiu Bo btrfs_err(fs_info, 2947cdccee99SLiu Bo "tree block extent item (%llu) is not found in extent tree", 2948cdccee99SLiu Bo bytenr); 2949cdccee99SLiu Bo WARN_ON(1); 2950cdccee99SLiu Bo ret = -EINVAL; 2951cdccee99SLiu Bo goto out; 2952cdccee99SLiu Bo } 29533173a18fSJosef Bacik 29545d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, blocks); 29555d4f98a2SYan Zheng out: 29565d4f98a2SYan Zheng btrfs_free_path(path); 29575d4f98a2SYan Zheng return ret; 29585d4f98a2SYan Zheng } 29595d4f98a2SYan Zheng 29600af3d00bSJosef Bacik static int delete_block_group_cache(struct btrfs_fs_info *fs_info, 296132da5386SDavid Sterba struct btrfs_block_group *block_group, 29621bbc621eSChris Mason struct inode *inode, 29631bbc621eSChris Mason u64 ino) 29640af3d00bSJosef Bacik { 29650af3d00bSJosef Bacik struct btrfs_root *root = fs_info->tree_root; 29660af3d00bSJosef Bacik struct btrfs_trans_handle *trans; 29670af3d00bSJosef Bacik int ret = 0; 29680af3d00bSJosef Bacik 29690af3d00bSJosef Bacik if (inode) 29700af3d00bSJosef Bacik goto truncate; 29710af3d00bSJosef Bacik 29720202e83fSDavid Sterba inode = btrfs_iget(fs_info->sb, ino, root); 29732e19f1f9SAl Viro if (IS_ERR(inode)) 29740af3d00bSJosef Bacik return -ENOENT; 29750af3d00bSJosef Bacik 29760af3d00bSJosef Bacik truncate: 29772ff7e61eSJeff Mahoney ret = btrfs_check_trunc_cache_free_space(fs_info, 29787b61cd92SMiao Xie &fs_info->global_block_rsv); 29797b61cd92SMiao Xie if (ret) 29807b61cd92SMiao Xie goto out; 29817b61cd92SMiao Xie 29827a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 29830af3d00bSJosef Bacik if (IS_ERR(trans)) { 29843612b495STsutomu Itoh ret = PTR_ERR(trans); 29850af3d00bSJosef Bacik goto out; 29860af3d00bSJosef Bacik } 29870af3d00bSJosef Bacik 298877ab86bfSJeff Mahoney ret = btrfs_truncate_free_space_cache(trans, block_group, inode); 29890af3d00bSJosef Bacik 29903a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29912ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 29920af3d00bSJosef Bacik out: 29930af3d00bSJosef Bacik iput(inode); 29940af3d00bSJosef Bacik return ret; 29950af3d00bSJosef Bacik } 29960af3d00bSJosef Bacik 29975d4f98a2SYan Zheng /* 299819b546d7SQu Wenruo * Locate the free space cache EXTENT_DATA in root tree leaf and delete the 299919b546d7SQu Wenruo * cache inode, to avoid free space cache data extent blocking data relocation. 30005d4f98a2SYan Zheng */ 300119b546d7SQu Wenruo static int delete_v1_space_cache(struct extent_buffer *leaf, 300219b546d7SQu Wenruo struct btrfs_block_group *block_group, 300319b546d7SQu Wenruo u64 data_bytenr) 30045d4f98a2SYan Zheng { 300519b546d7SQu Wenruo u64 space_cache_ino; 300619b546d7SQu Wenruo struct btrfs_file_extent_item *ei; 30075d4f98a2SYan Zheng struct btrfs_key key; 300819b546d7SQu Wenruo bool found = false; 300919b546d7SQu Wenruo int i; 30105d4f98a2SYan Zheng int ret; 30115d4f98a2SYan Zheng 301219b546d7SQu Wenruo if (btrfs_header_owner(leaf) != BTRFS_ROOT_TREE_OBJECTID) 301319b546d7SQu Wenruo return 0; 30145d4f98a2SYan Zheng 301519b546d7SQu Wenruo for (i = 0; i < btrfs_header_nritems(leaf); i++) { 301619b546d7SQu Wenruo btrfs_item_key_to_cpu(leaf, &key, i); 301719b546d7SQu Wenruo if (key.type != BTRFS_EXTENT_DATA_KEY) 301819b546d7SQu Wenruo continue; 301919b546d7SQu Wenruo ei = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 302019b546d7SQu Wenruo if (btrfs_file_extent_type(leaf, ei) == BTRFS_FILE_EXTENT_REG && 302119b546d7SQu Wenruo btrfs_file_extent_disk_bytenr(leaf, ei) == data_bytenr) { 302219b546d7SQu Wenruo found = true; 302319b546d7SQu Wenruo space_cache_ino = key.objectid; 302419b546d7SQu Wenruo break; 302519b546d7SQu Wenruo } 302619b546d7SQu Wenruo } 302719b546d7SQu Wenruo if (!found) 302819b546d7SQu Wenruo return -ENOENT; 302919b546d7SQu Wenruo ret = delete_block_group_cache(leaf->fs_info, block_group, NULL, 303019b546d7SQu Wenruo space_cache_ino); 30310af3d00bSJosef Bacik return ret; 30325d4f98a2SYan Zheng } 30335d4f98a2SYan Zheng 30345d4f98a2SYan Zheng /* 30352c016dc2SLiu Bo * helper to find all tree blocks that reference a given data extent 30365d4f98a2SYan Zheng */ 30375d4f98a2SYan Zheng static noinline_for_stack 30385d4f98a2SYan Zheng int add_data_references(struct reloc_control *rc, 30395d4f98a2SYan Zheng struct btrfs_key *extent_key, 30405d4f98a2SYan Zheng struct btrfs_path *path, 30415d4f98a2SYan Zheng struct rb_root *blocks) 30425d4f98a2SYan Zheng { 304319b546d7SQu Wenruo struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 304419b546d7SQu Wenruo struct ulist *leaves = NULL; 304519b546d7SQu Wenruo struct ulist_iterator leaf_uiter; 304619b546d7SQu Wenruo struct ulist_node *ref_node = NULL; 304719b546d7SQu Wenruo const u32 blocksize = fs_info->nodesize; 3048647f63bdSFilipe David Borba Manana int ret = 0; 30495d4f98a2SYan Zheng 3050b3b4aa74SDavid Sterba btrfs_release_path(path); 305119b546d7SQu Wenruo ret = btrfs_find_all_leafs(NULL, fs_info, extent_key->objectid, 305219b546d7SQu Wenruo 0, &leaves, NULL, true); 305319b546d7SQu Wenruo if (ret < 0) 305419b546d7SQu Wenruo return ret; 305519b546d7SQu Wenruo 305619b546d7SQu Wenruo ULIST_ITER_INIT(&leaf_uiter); 305719b546d7SQu Wenruo while ((ref_node = ulist_next(leaves, &leaf_uiter))) { 305819b546d7SQu Wenruo struct extent_buffer *eb; 305919b546d7SQu Wenruo 306019b546d7SQu Wenruo eb = read_tree_block(fs_info, ref_node->val, 0, 0, NULL); 306119b546d7SQu Wenruo if (IS_ERR(eb)) { 306219b546d7SQu Wenruo ret = PTR_ERR(eb); 306319b546d7SQu Wenruo break; 306419b546d7SQu Wenruo } 306519b546d7SQu Wenruo ret = delete_v1_space_cache(eb, rc->block_group, 306619b546d7SQu Wenruo extent_key->objectid); 306719b546d7SQu Wenruo free_extent_buffer(eb); 306819b546d7SQu Wenruo if (ret < 0) 306919b546d7SQu Wenruo break; 307019b546d7SQu Wenruo ret = __add_tree_block(rc, ref_node->val, blocksize, blocks); 307119b546d7SQu Wenruo if (ret < 0) 307219b546d7SQu Wenruo break; 307319b546d7SQu Wenruo } 307419b546d7SQu Wenruo if (ret < 0) 30755d4f98a2SYan Zheng free_block_list(blocks); 307619b546d7SQu Wenruo ulist_free(leaves); 307719b546d7SQu Wenruo return ret; 30785d4f98a2SYan Zheng } 30795d4f98a2SYan Zheng 30805d4f98a2SYan Zheng /* 30812c016dc2SLiu Bo * helper to find next unprocessed extent 30825d4f98a2SYan Zheng */ 30835d4f98a2SYan Zheng static noinline_for_stack 3084147d256eSZhaolei int find_next_extent(struct reloc_control *rc, struct btrfs_path *path, 30853fd0a558SYan, Zheng struct btrfs_key *extent_key) 30865d4f98a2SYan Zheng { 30870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 30885d4f98a2SYan Zheng struct btrfs_key key; 30895d4f98a2SYan Zheng struct extent_buffer *leaf; 30905d4f98a2SYan Zheng u64 start, end, last; 30915d4f98a2SYan Zheng int ret; 30925d4f98a2SYan Zheng 3093b3470b5dSDavid Sterba last = rc->block_group->start + rc->block_group->length; 30945d4f98a2SYan Zheng while (1) { 30955d4f98a2SYan Zheng cond_resched(); 30965d4f98a2SYan Zheng if (rc->search_start >= last) { 30975d4f98a2SYan Zheng ret = 1; 30985d4f98a2SYan Zheng break; 30995d4f98a2SYan Zheng } 31005d4f98a2SYan Zheng 31015d4f98a2SYan Zheng key.objectid = rc->search_start; 31025d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 31035d4f98a2SYan Zheng key.offset = 0; 31045d4f98a2SYan Zheng 31055d4f98a2SYan Zheng path->search_commit_root = 1; 31065d4f98a2SYan Zheng path->skip_locking = 1; 31075d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 31085d4f98a2SYan Zheng 0, 0); 31095d4f98a2SYan Zheng if (ret < 0) 31105d4f98a2SYan Zheng break; 31115d4f98a2SYan Zheng next: 31125d4f98a2SYan Zheng leaf = path->nodes[0]; 31135d4f98a2SYan Zheng if (path->slots[0] >= btrfs_header_nritems(leaf)) { 31145d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 31155d4f98a2SYan Zheng if (ret != 0) 31165d4f98a2SYan Zheng break; 31175d4f98a2SYan Zheng leaf = path->nodes[0]; 31185d4f98a2SYan Zheng } 31195d4f98a2SYan Zheng 31205d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 31215d4f98a2SYan Zheng if (key.objectid >= last) { 31225d4f98a2SYan Zheng ret = 1; 31235d4f98a2SYan Zheng break; 31245d4f98a2SYan Zheng } 31255d4f98a2SYan Zheng 31263173a18fSJosef Bacik if (key.type != BTRFS_EXTENT_ITEM_KEY && 31273173a18fSJosef Bacik key.type != BTRFS_METADATA_ITEM_KEY) { 31283173a18fSJosef Bacik path->slots[0]++; 31293173a18fSJosef Bacik goto next; 31303173a18fSJosef Bacik } 31313173a18fSJosef Bacik 31323173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY && 31335d4f98a2SYan Zheng key.objectid + key.offset <= rc->search_start) { 31345d4f98a2SYan Zheng path->slots[0]++; 31355d4f98a2SYan Zheng goto next; 31365d4f98a2SYan Zheng } 31375d4f98a2SYan Zheng 31383173a18fSJosef Bacik if (key.type == BTRFS_METADATA_ITEM_KEY && 31390b246afaSJeff Mahoney key.objectid + fs_info->nodesize <= 31403173a18fSJosef Bacik rc->search_start) { 31413173a18fSJosef Bacik path->slots[0]++; 31423173a18fSJosef Bacik goto next; 31433173a18fSJosef Bacik } 31443173a18fSJosef Bacik 31455d4f98a2SYan Zheng ret = find_first_extent_bit(&rc->processed_blocks, 31465d4f98a2SYan Zheng key.objectid, &start, &end, 3147e6138876SJosef Bacik EXTENT_DIRTY, NULL); 31485d4f98a2SYan Zheng 31495d4f98a2SYan Zheng if (ret == 0 && start <= key.objectid) { 3150b3b4aa74SDavid Sterba btrfs_release_path(path); 31515d4f98a2SYan Zheng rc->search_start = end + 1; 31525d4f98a2SYan Zheng } else { 31533173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY) 31545d4f98a2SYan Zheng rc->search_start = key.objectid + key.offset; 31553173a18fSJosef Bacik else 31563173a18fSJosef Bacik rc->search_start = key.objectid + 31570b246afaSJeff Mahoney fs_info->nodesize; 31583fd0a558SYan, Zheng memcpy(extent_key, &key, sizeof(key)); 31595d4f98a2SYan Zheng return 0; 31605d4f98a2SYan Zheng } 31615d4f98a2SYan Zheng } 3162b3b4aa74SDavid Sterba btrfs_release_path(path); 31635d4f98a2SYan Zheng return ret; 31645d4f98a2SYan Zheng } 31655d4f98a2SYan Zheng 31665d4f98a2SYan Zheng static void set_reloc_control(struct reloc_control *rc) 31675d4f98a2SYan Zheng { 31685d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31697585717fSChris Mason 31707585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 31715d4f98a2SYan Zheng fs_info->reloc_ctl = rc; 31727585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 31735d4f98a2SYan Zheng } 31745d4f98a2SYan Zheng 31755d4f98a2SYan Zheng static void unset_reloc_control(struct reloc_control *rc) 31765d4f98a2SYan Zheng { 31775d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31787585717fSChris Mason 31797585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 31805d4f98a2SYan Zheng fs_info->reloc_ctl = NULL; 31817585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 31825d4f98a2SYan Zheng } 31835d4f98a2SYan Zheng 31845d4f98a2SYan Zheng static int check_extent_flags(u64 flags) 31855d4f98a2SYan Zheng { 31865d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 31875d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 31885d4f98a2SYan Zheng return 1; 31895d4f98a2SYan Zheng if (!(flags & BTRFS_EXTENT_FLAG_DATA) && 31905d4f98a2SYan Zheng !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 31915d4f98a2SYan Zheng return 1; 31925d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 31935d4f98a2SYan Zheng (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) 31945d4f98a2SYan Zheng return 1; 31955d4f98a2SYan Zheng return 0; 31965d4f98a2SYan Zheng } 31975d4f98a2SYan Zheng 31983fd0a558SYan, Zheng static noinline_for_stack 31993fd0a558SYan, Zheng int prepare_to_relocate(struct reloc_control *rc) 32003fd0a558SYan, Zheng { 32013fd0a558SYan, Zheng struct btrfs_trans_handle *trans; 3202ac2fabacSJosef Bacik int ret; 32033fd0a558SYan, Zheng 32042ff7e61eSJeff Mahoney rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root->fs_info, 320566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 32063fd0a558SYan, Zheng if (!rc->block_rsv) 32073fd0a558SYan, Zheng return -ENOMEM; 32083fd0a558SYan, Zheng 32093fd0a558SYan, Zheng memset(&rc->cluster, 0, sizeof(rc->cluster)); 3210b3470b5dSDavid Sterba rc->search_start = rc->block_group->start; 32113fd0a558SYan, Zheng rc->extents_found = 0; 32123fd0a558SYan, Zheng rc->nodes_relocated = 0; 32133fd0a558SYan, Zheng rc->merging_rsv_size = 0; 32140647bf56SWang Shilong rc->reserved_bytes = 0; 3215da17066cSJeff Mahoney rc->block_rsv->size = rc->extent_root->fs_info->nodesize * 32160647bf56SWang Shilong RELOCATION_RESERVED_NODES; 3217ac2fabacSJosef Bacik ret = btrfs_block_rsv_refill(rc->extent_root, 3218ac2fabacSJosef Bacik rc->block_rsv, rc->block_rsv->size, 3219ac2fabacSJosef Bacik BTRFS_RESERVE_FLUSH_ALL); 3220ac2fabacSJosef Bacik if (ret) 3221ac2fabacSJosef Bacik return ret; 32223fd0a558SYan, Zheng 32233fd0a558SYan, Zheng rc->create_reloc_tree = 1; 32243fd0a558SYan, Zheng set_reloc_control(rc); 32253fd0a558SYan, Zheng 32267a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 322728818947SLiu Bo if (IS_ERR(trans)) { 322828818947SLiu Bo unset_reloc_control(rc); 322928818947SLiu Bo /* 323028818947SLiu Bo * extent tree is not a ref_cow tree and has no reloc_root to 323128818947SLiu Bo * cleanup. And callers are responsible to free the above 323228818947SLiu Bo * block rsv. 323328818947SLiu Bo */ 323428818947SLiu Bo return PTR_ERR(trans); 323528818947SLiu Bo } 32363a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 32373fd0a558SYan, Zheng return 0; 32383fd0a558SYan, Zheng } 323976dda93cSYan, Zheng 32405d4f98a2SYan Zheng static noinline_for_stack int relocate_block_group(struct reloc_control *rc) 32415d4f98a2SYan Zheng { 32422ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 32435d4f98a2SYan Zheng struct rb_root blocks = RB_ROOT; 32445d4f98a2SYan Zheng struct btrfs_key key; 32455d4f98a2SYan Zheng struct btrfs_trans_handle *trans = NULL; 32465d4f98a2SYan Zheng struct btrfs_path *path; 32475d4f98a2SYan Zheng struct btrfs_extent_item *ei; 32485d4f98a2SYan Zheng u64 flags; 32495d4f98a2SYan Zheng u32 item_size; 32505d4f98a2SYan Zheng int ret; 32515d4f98a2SYan Zheng int err = 0; 3252c87f08caSChris Mason int progress = 0; 32535d4f98a2SYan Zheng 32545d4f98a2SYan Zheng path = btrfs_alloc_path(); 32553fd0a558SYan, Zheng if (!path) 32565d4f98a2SYan Zheng return -ENOMEM; 3257e4058b54SDavid Sterba path->reada = READA_FORWARD; 32583fd0a558SYan, Zheng 32593fd0a558SYan, Zheng ret = prepare_to_relocate(rc); 32603fd0a558SYan, Zheng if (ret) { 32613fd0a558SYan, Zheng err = ret; 32623fd0a558SYan, Zheng goto out_free; 32632423fdfbSJiri Slaby } 32645d4f98a2SYan Zheng 32655d4f98a2SYan Zheng while (1) { 32660647bf56SWang Shilong rc->reserved_bytes = 0; 32670647bf56SWang Shilong ret = btrfs_block_rsv_refill(rc->extent_root, 32680647bf56SWang Shilong rc->block_rsv, rc->block_rsv->size, 32690647bf56SWang Shilong BTRFS_RESERVE_FLUSH_ALL); 32700647bf56SWang Shilong if (ret) { 32710647bf56SWang Shilong err = ret; 32720647bf56SWang Shilong break; 32730647bf56SWang Shilong } 3274c87f08caSChris Mason progress++; 3275a22285a6SYan, Zheng trans = btrfs_start_transaction(rc->extent_root, 0); 32760f788c58SLiu Bo if (IS_ERR(trans)) { 32770f788c58SLiu Bo err = PTR_ERR(trans); 32780f788c58SLiu Bo trans = NULL; 32790f788c58SLiu Bo break; 32800f788c58SLiu Bo } 3281c87f08caSChris Mason restart: 32823fd0a558SYan, Zheng if (update_backref_cache(trans, &rc->backref_cache)) { 32833a45bb20SJeff Mahoney btrfs_end_transaction(trans); 328442a657f5SPan Bian trans = NULL; 32853fd0a558SYan, Zheng continue; 32863fd0a558SYan, Zheng } 32873fd0a558SYan, Zheng 3288147d256eSZhaolei ret = find_next_extent(rc, path, &key); 32895d4f98a2SYan Zheng if (ret < 0) 32905d4f98a2SYan Zheng err = ret; 32915d4f98a2SYan Zheng if (ret != 0) 32925d4f98a2SYan Zheng break; 32935d4f98a2SYan Zheng 32945d4f98a2SYan Zheng rc->extents_found++; 32955d4f98a2SYan Zheng 32965d4f98a2SYan Zheng ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 32975d4f98a2SYan Zheng struct btrfs_extent_item); 32983fd0a558SYan, Zheng item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); 32995d4f98a2SYan Zheng if (item_size >= sizeof(*ei)) { 33005d4f98a2SYan Zheng flags = btrfs_extent_flags(path->nodes[0], ei); 33015d4f98a2SYan Zheng ret = check_extent_flags(flags); 33025d4f98a2SYan Zheng BUG_ON(ret); 33036d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 3304ba3c2b19SNikolay Borisov err = -EINVAL; 3305ba3c2b19SNikolay Borisov btrfs_print_v0_err(trans->fs_info); 3306ba3c2b19SNikolay Borisov btrfs_abort_transaction(trans, err); 3307ba3c2b19SNikolay Borisov break; 33085d4f98a2SYan Zheng } else { 33095d4f98a2SYan Zheng BUG(); 33105d4f98a2SYan Zheng } 33115d4f98a2SYan Zheng 33125d4f98a2SYan Zheng if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 33135d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, &blocks); 33145d4f98a2SYan Zheng } else if (rc->stage == UPDATE_DATA_PTRS && 33155d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 33165d4f98a2SYan Zheng ret = add_data_references(rc, &key, path, &blocks); 33175d4f98a2SYan Zheng } else { 3318b3b4aa74SDavid Sterba btrfs_release_path(path); 33195d4f98a2SYan Zheng ret = 0; 33205d4f98a2SYan Zheng } 33215d4f98a2SYan Zheng if (ret < 0) { 33223fd0a558SYan, Zheng err = ret; 33235d4f98a2SYan Zheng break; 33245d4f98a2SYan Zheng } 33255d4f98a2SYan Zheng 33265d4f98a2SYan Zheng if (!RB_EMPTY_ROOT(&blocks)) { 33275d4f98a2SYan Zheng ret = relocate_tree_blocks(trans, rc, &blocks); 33285d4f98a2SYan Zheng if (ret < 0) { 33293fd0a558SYan, Zheng if (ret != -EAGAIN) { 33305d4f98a2SYan Zheng err = ret; 33315d4f98a2SYan Zheng break; 33325d4f98a2SYan Zheng } 33333fd0a558SYan, Zheng rc->extents_found--; 33343fd0a558SYan, Zheng rc->search_start = key.objectid; 33353fd0a558SYan, Zheng } 33365d4f98a2SYan Zheng } 33375d4f98a2SYan Zheng 33383a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 33392ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 33403fd0a558SYan, Zheng trans = NULL; 33415d4f98a2SYan Zheng 33425d4f98a2SYan Zheng if (rc->stage == MOVE_DATA_EXTENTS && 33435d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 33445d4f98a2SYan Zheng rc->found_file_extent = 1; 33450257bb82SYan, Zheng ret = relocate_data_extent(rc->data_inode, 33463fd0a558SYan, Zheng &key, &rc->cluster); 33475d4f98a2SYan Zheng if (ret < 0) { 33485d4f98a2SYan Zheng err = ret; 33495d4f98a2SYan Zheng break; 33505d4f98a2SYan Zheng } 33515d4f98a2SYan Zheng } 3352f31ea088SQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 3353f31ea088SQu Wenruo err = -ECANCELED; 3354f31ea088SQu Wenruo break; 3355f31ea088SQu Wenruo } 33565d4f98a2SYan Zheng } 3357c87f08caSChris Mason if (trans && progress && err == -ENOSPC) { 335843a7e99dSNikolay Borisov ret = btrfs_force_chunk_alloc(trans, rc->block_group->flags); 33599689457bSShilong Wang if (ret == 1) { 3360c87f08caSChris Mason err = 0; 3361c87f08caSChris Mason progress = 0; 3362c87f08caSChris Mason goto restart; 3363c87f08caSChris Mason } 3364c87f08caSChris Mason } 33653fd0a558SYan, Zheng 3366b3b4aa74SDavid Sterba btrfs_release_path(path); 336791166212SDavid Sterba clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY); 33685d4f98a2SYan Zheng 33695d4f98a2SYan Zheng if (trans) { 33703a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 33712ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 33725d4f98a2SYan Zheng } 33735d4f98a2SYan Zheng 33740257bb82SYan, Zheng if (!err) { 33753fd0a558SYan, Zheng ret = relocate_file_extent_cluster(rc->data_inode, 33763fd0a558SYan, Zheng &rc->cluster); 33770257bb82SYan, Zheng if (ret < 0) 33780257bb82SYan, Zheng err = ret; 33790257bb82SYan, Zheng } 33800257bb82SYan, Zheng 33813fd0a558SYan, Zheng rc->create_reloc_tree = 0; 33823fd0a558SYan, Zheng set_reloc_control(rc); 33830257bb82SYan, Zheng 338413fe1bdbSQu Wenruo btrfs_backref_release_cache(&rc->backref_cache); 338563f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 33865d4f98a2SYan Zheng 33877f913c7cSQu Wenruo /* 33887f913c7cSQu Wenruo * Even in the case when the relocation is cancelled, we should all go 33897f913c7cSQu Wenruo * through prepare_to_merge() and merge_reloc_roots(). 33907f913c7cSQu Wenruo * 33917f913c7cSQu Wenruo * For error (including cancelled balance), prepare_to_merge() will 33927f913c7cSQu Wenruo * mark all reloc trees orphan, then queue them for cleanup in 33937f913c7cSQu Wenruo * merge_reloc_roots() 33947f913c7cSQu Wenruo */ 33953fd0a558SYan, Zheng err = prepare_to_merge(rc, err); 33965d4f98a2SYan Zheng 33975d4f98a2SYan Zheng merge_reloc_roots(rc); 33985d4f98a2SYan Zheng 33993fd0a558SYan, Zheng rc->merge_reloc_tree = 0; 34005d4f98a2SYan Zheng unset_reloc_control(rc); 340163f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 34025d4f98a2SYan Zheng 34035d4f98a2SYan Zheng /* get rid of pinned extents */ 34047a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 340562b99540SQu Wenruo if (IS_ERR(trans)) { 34063612b495STsutomu Itoh err = PTR_ERR(trans); 340762b99540SQu Wenruo goto out_free; 340862b99540SQu Wenruo } 34093a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 34106217b0faSJosef Bacik out_free: 3411d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3412d2311e69SQu Wenruo if (ret < 0 && !err) 3413d2311e69SQu Wenruo err = ret; 34142ff7e61eSJeff Mahoney btrfs_free_block_rsv(fs_info, rc->block_rsv); 34153fd0a558SYan, Zheng btrfs_free_path(path); 34165d4f98a2SYan Zheng return err; 34175d4f98a2SYan Zheng } 34185d4f98a2SYan Zheng 34195d4f98a2SYan Zheng static int __insert_orphan_inode(struct btrfs_trans_handle *trans, 34200257bb82SYan, Zheng struct btrfs_root *root, u64 objectid) 34215d4f98a2SYan Zheng { 34225d4f98a2SYan Zheng struct btrfs_path *path; 34235d4f98a2SYan Zheng struct btrfs_inode_item *item; 34245d4f98a2SYan Zheng struct extent_buffer *leaf; 34255d4f98a2SYan Zheng int ret; 34265d4f98a2SYan Zheng 34275d4f98a2SYan Zheng path = btrfs_alloc_path(); 34285d4f98a2SYan Zheng if (!path) 34295d4f98a2SYan Zheng return -ENOMEM; 34305d4f98a2SYan Zheng 34315d4f98a2SYan Zheng ret = btrfs_insert_empty_inode(trans, root, path, objectid); 34325d4f98a2SYan Zheng if (ret) 34335d4f98a2SYan Zheng goto out; 34345d4f98a2SYan Zheng 34355d4f98a2SYan Zheng leaf = path->nodes[0]; 34365d4f98a2SYan Zheng item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); 3437b159fa28SDavid Sterba memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item)); 34385d4f98a2SYan Zheng btrfs_set_inode_generation(leaf, item, 1); 34390257bb82SYan, Zheng btrfs_set_inode_size(leaf, item, 0); 34405d4f98a2SYan Zheng btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); 34413fd0a558SYan, Zheng btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | 34423fd0a558SYan, Zheng BTRFS_INODE_PREALLOC); 34435d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 34445d4f98a2SYan Zheng out: 34455d4f98a2SYan Zheng btrfs_free_path(path); 34465d4f98a2SYan Zheng return ret; 34475d4f98a2SYan Zheng } 34485d4f98a2SYan Zheng 34495d4f98a2SYan Zheng /* 34505d4f98a2SYan Zheng * helper to create inode for data relocation. 34515d4f98a2SYan Zheng * the inode is in data relocation tree and its link count is 0 34525d4f98a2SYan Zheng */ 34533fd0a558SYan, Zheng static noinline_for_stack 34543fd0a558SYan, Zheng struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, 345532da5386SDavid Sterba struct btrfs_block_group *group) 34565d4f98a2SYan Zheng { 34575d4f98a2SYan Zheng struct inode *inode = NULL; 34585d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 34595d4f98a2SYan Zheng struct btrfs_root *root; 34604624900dSZhaolei u64 objectid; 34615d4f98a2SYan Zheng int err = 0; 34625d4f98a2SYan Zheng 3463aeb935a4SQu Wenruo root = btrfs_grab_root(fs_info->data_reloc_root); 3464a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 346576deacf0SJosef Bacik if (IS_ERR(trans)) { 346600246528SJosef Bacik btrfs_put_root(root); 34673fd0a558SYan, Zheng return ERR_CAST(trans); 346876deacf0SJosef Bacik } 34695d4f98a2SYan Zheng 3470581bb050SLi Zefan err = btrfs_find_free_objectid(root, &objectid); 34715d4f98a2SYan Zheng if (err) 34725d4f98a2SYan Zheng goto out; 34735d4f98a2SYan Zheng 34740257bb82SYan, Zheng err = __insert_orphan_inode(trans, root, objectid); 34755d4f98a2SYan Zheng BUG_ON(err); 34765d4f98a2SYan Zheng 34770202e83fSDavid Sterba inode = btrfs_iget(fs_info->sb, objectid, root); 34782e19f1f9SAl Viro BUG_ON(IS_ERR(inode)); 3479b3470b5dSDavid Sterba BTRFS_I(inode)->index_cnt = group->start; 34805d4f98a2SYan Zheng 348173f2e545SNikolay Borisov err = btrfs_orphan_add(trans, BTRFS_I(inode)); 34825d4f98a2SYan Zheng out: 348300246528SJosef Bacik btrfs_put_root(root); 34843a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34852ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 34865d4f98a2SYan Zheng if (err) { 34875d4f98a2SYan Zheng if (inode) 34885d4f98a2SYan Zheng iput(inode); 34895d4f98a2SYan Zheng inode = ERR_PTR(err); 34905d4f98a2SYan Zheng } 34915d4f98a2SYan Zheng return inode; 34925d4f98a2SYan Zheng } 34935d4f98a2SYan Zheng 3494c258d6e3SQu Wenruo static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) 34953fd0a558SYan, Zheng { 34963fd0a558SYan, Zheng struct reloc_control *rc; 34973fd0a558SYan, Zheng 34983fd0a558SYan, Zheng rc = kzalloc(sizeof(*rc), GFP_NOFS); 34993fd0a558SYan, Zheng if (!rc) 35003fd0a558SYan, Zheng return NULL; 35013fd0a558SYan, Zheng 35023fd0a558SYan, Zheng INIT_LIST_HEAD(&rc->reloc_roots); 3503d2311e69SQu Wenruo INIT_LIST_HEAD(&rc->dirty_subvol_roots); 3504584fb121SQu Wenruo btrfs_backref_init_cache(fs_info, &rc->backref_cache, 1); 35053fd0a558SYan, Zheng mapping_tree_init(&rc->reloc_root_tree); 350643eb5f29SQu Wenruo extent_io_tree_init(fs_info, &rc->processed_blocks, 350743eb5f29SQu Wenruo IO_TREE_RELOC_BLOCKS, NULL); 35083fd0a558SYan, Zheng return rc; 35093fd0a558SYan, Zheng } 35103fd0a558SYan, Zheng 35111a0afa0eSJosef Bacik static void free_reloc_control(struct reloc_control *rc) 35121a0afa0eSJosef Bacik { 35131a0afa0eSJosef Bacik struct mapping_node *node, *tmp; 35141a0afa0eSJosef Bacik 35151a0afa0eSJosef Bacik free_reloc_roots(&rc->reloc_roots); 35161a0afa0eSJosef Bacik rbtree_postorder_for_each_entry_safe(node, tmp, 35171a0afa0eSJosef Bacik &rc->reloc_root_tree.rb_root, rb_node) 35181a0afa0eSJosef Bacik kfree(node); 35191a0afa0eSJosef Bacik 35201a0afa0eSJosef Bacik kfree(rc); 35211a0afa0eSJosef Bacik } 35221a0afa0eSJosef Bacik 35235d4f98a2SYan Zheng /* 3524ebce0e01SAdam Borowski * Print the block group being relocated 3525ebce0e01SAdam Borowski */ 3526ebce0e01SAdam Borowski static void describe_relocation(struct btrfs_fs_info *fs_info, 352732da5386SDavid Sterba struct btrfs_block_group *block_group) 3528ebce0e01SAdam Borowski { 3529f89e09cfSAnand Jain char buf[128] = {'\0'}; 3530ebce0e01SAdam Borowski 3531f89e09cfSAnand Jain btrfs_describe_block_groups(block_group->flags, buf, sizeof(buf)); 3532ebce0e01SAdam Borowski 3533ebce0e01SAdam Borowski btrfs_info(fs_info, 3534ebce0e01SAdam Borowski "relocating block group %llu flags %s", 3535b3470b5dSDavid Sterba block_group->start, buf); 3536ebce0e01SAdam Borowski } 3537ebce0e01SAdam Borowski 3538430640e3SQu Wenruo static const char *stage_to_string(int stage) 3539430640e3SQu Wenruo { 3540430640e3SQu Wenruo if (stage == MOVE_DATA_EXTENTS) 3541430640e3SQu Wenruo return "move data extents"; 3542430640e3SQu Wenruo if (stage == UPDATE_DATA_PTRS) 3543430640e3SQu Wenruo return "update data pointers"; 3544430640e3SQu Wenruo return "unknown"; 3545430640e3SQu Wenruo } 3546430640e3SQu Wenruo 3547ebce0e01SAdam Borowski /* 35485d4f98a2SYan Zheng * function to relocate all extents in a block group. 35495d4f98a2SYan Zheng */ 35506bccf3abSJeff Mahoney int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start) 35515d4f98a2SYan Zheng { 355232da5386SDavid Sterba struct btrfs_block_group *bg; 35536bccf3abSJeff Mahoney struct btrfs_root *extent_root = fs_info->extent_root; 35545d4f98a2SYan Zheng struct reloc_control *rc; 35550af3d00bSJosef Bacik struct inode *inode; 35560af3d00bSJosef Bacik struct btrfs_path *path; 35575d4f98a2SYan Zheng int ret; 3558f0486c68SYan, Zheng int rw = 0; 35595d4f98a2SYan Zheng int err = 0; 35605d4f98a2SYan Zheng 3561eede2bf3SOmar Sandoval bg = btrfs_lookup_block_group(fs_info, group_start); 3562eede2bf3SOmar Sandoval if (!bg) 3563eede2bf3SOmar Sandoval return -ENOENT; 3564eede2bf3SOmar Sandoval 3565eede2bf3SOmar Sandoval if (btrfs_pinned_by_swapfile(fs_info, bg)) { 3566eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 3567eede2bf3SOmar Sandoval return -ETXTBSY; 3568eede2bf3SOmar Sandoval } 3569eede2bf3SOmar Sandoval 3570c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 3571eede2bf3SOmar Sandoval if (!rc) { 3572eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 35735d4f98a2SYan Zheng return -ENOMEM; 3574eede2bf3SOmar Sandoval } 35755d4f98a2SYan Zheng 3576f0486c68SYan, Zheng rc->extent_root = extent_root; 3577eede2bf3SOmar Sandoval rc->block_group = bg; 35785d4f98a2SYan Zheng 3579b12de528SQu Wenruo ret = btrfs_inc_block_group_ro(rc->block_group, true); 3580f0486c68SYan, Zheng if (ret) { 3581f0486c68SYan, Zheng err = ret; 3582f0486c68SYan, Zheng goto out; 3583f0486c68SYan, Zheng } 3584f0486c68SYan, Zheng rw = 1; 3585f0486c68SYan, Zheng 35860af3d00bSJosef Bacik path = btrfs_alloc_path(); 35870af3d00bSJosef Bacik if (!path) { 35880af3d00bSJosef Bacik err = -ENOMEM; 35890af3d00bSJosef Bacik goto out; 35900af3d00bSJosef Bacik } 35910af3d00bSJosef Bacik 35927949f339SDavid Sterba inode = lookup_free_space_inode(rc->block_group, path); 35930af3d00bSJosef Bacik btrfs_free_path(path); 35940af3d00bSJosef Bacik 35950af3d00bSJosef Bacik if (!IS_ERR(inode)) 35961bbc621eSChris Mason ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0); 35970af3d00bSJosef Bacik else 35980af3d00bSJosef Bacik ret = PTR_ERR(inode); 35990af3d00bSJosef Bacik 36000af3d00bSJosef Bacik if (ret && ret != -ENOENT) { 36010af3d00bSJosef Bacik err = ret; 36020af3d00bSJosef Bacik goto out; 36030af3d00bSJosef Bacik } 36040af3d00bSJosef Bacik 36055d4f98a2SYan Zheng rc->data_inode = create_reloc_inode(fs_info, rc->block_group); 36065d4f98a2SYan Zheng if (IS_ERR(rc->data_inode)) { 36075d4f98a2SYan Zheng err = PTR_ERR(rc->data_inode); 36085d4f98a2SYan Zheng rc->data_inode = NULL; 36095d4f98a2SYan Zheng goto out; 36105d4f98a2SYan Zheng } 36115d4f98a2SYan Zheng 36120b246afaSJeff Mahoney describe_relocation(fs_info, rc->block_group); 36135d4f98a2SYan Zheng 36149cfa3e34SFilipe Manana btrfs_wait_block_group_reservations(rc->block_group); 3615f78c436cSFilipe Manana btrfs_wait_nocow_writers(rc->block_group); 36166374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 3617b3470b5dSDavid Sterba rc->block_group->start, 3618b3470b5dSDavid Sterba rc->block_group->length); 36195d4f98a2SYan Zheng 36205d4f98a2SYan Zheng while (1) { 3621430640e3SQu Wenruo int finishes_stage; 3622430640e3SQu Wenruo 362376dda93cSYan, Zheng mutex_lock(&fs_info->cleaner_mutex); 36245d4f98a2SYan Zheng ret = relocate_block_group(rc); 362576dda93cSYan, Zheng mutex_unlock(&fs_info->cleaner_mutex); 3626ff612ba7SJosef Bacik if (ret < 0) 36275d4f98a2SYan Zheng err = ret; 3628ff612ba7SJosef Bacik 3629430640e3SQu Wenruo finishes_stage = rc->stage; 3630ff612ba7SJosef Bacik /* 3631ff612ba7SJosef Bacik * We may have gotten ENOSPC after we already dirtied some 3632ff612ba7SJosef Bacik * extents. If writeout happens while we're relocating a 3633ff612ba7SJosef Bacik * different block group we could end up hitting the 3634ff612ba7SJosef Bacik * BUG_ON(rc->stage == UPDATE_DATA_PTRS) in 3635ff612ba7SJosef Bacik * btrfs_reloc_cow_block. Make sure we write everything out 3636ff612ba7SJosef Bacik * properly so we don't trip over this problem, and then break 3637ff612ba7SJosef Bacik * out of the loop if we hit an error. 3638ff612ba7SJosef Bacik */ 3639ff612ba7SJosef Bacik if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { 3640ff612ba7SJosef Bacik ret = btrfs_wait_ordered_range(rc->data_inode, 0, 3641ff612ba7SJosef Bacik (u64)-1); 3642ff612ba7SJosef Bacik if (ret) 3643ff612ba7SJosef Bacik err = ret; 3644ff612ba7SJosef Bacik invalidate_mapping_pages(rc->data_inode->i_mapping, 3645ff612ba7SJosef Bacik 0, -1); 3646ff612ba7SJosef Bacik rc->stage = UPDATE_DATA_PTRS; 36475d4f98a2SYan Zheng } 36485d4f98a2SYan Zheng 3649ff612ba7SJosef Bacik if (err < 0) 3650ff612ba7SJosef Bacik goto out; 3651ff612ba7SJosef Bacik 36525d4f98a2SYan Zheng if (rc->extents_found == 0) 36535d4f98a2SYan Zheng break; 36545d4f98a2SYan Zheng 3655430640e3SQu Wenruo btrfs_info(fs_info, "found %llu extents, stage: %s", 3656430640e3SQu Wenruo rc->extents_found, stage_to_string(finishes_stage)); 36575d4f98a2SYan Zheng } 36585d4f98a2SYan Zheng 36595d4f98a2SYan Zheng WARN_ON(rc->block_group->pinned > 0); 36605d4f98a2SYan Zheng WARN_ON(rc->block_group->reserved > 0); 3661bf38be65SDavid Sterba WARN_ON(rc->block_group->used > 0); 36625d4f98a2SYan Zheng out: 3663f0486c68SYan, Zheng if (err && rw) 36642ff7e61eSJeff Mahoney btrfs_dec_block_group_ro(rc->block_group); 36655d4f98a2SYan Zheng iput(rc->data_inode); 36665d4f98a2SYan Zheng btrfs_put_block_group(rc->block_group); 36671a0afa0eSJosef Bacik free_reloc_control(rc); 36685d4f98a2SYan Zheng return err; 36695d4f98a2SYan Zheng } 36705d4f98a2SYan Zheng 367176dda93cSYan, Zheng static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) 367276dda93cSYan, Zheng { 36730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 367476dda93cSYan, Zheng struct btrfs_trans_handle *trans; 367579787eaaSJeff Mahoney int ret, err; 367676dda93cSYan, Zheng 36770b246afaSJeff Mahoney trans = btrfs_start_transaction(fs_info->tree_root, 0); 367879787eaaSJeff Mahoney if (IS_ERR(trans)) 367979787eaaSJeff Mahoney return PTR_ERR(trans); 368076dda93cSYan, Zheng 368176dda93cSYan, Zheng memset(&root->root_item.drop_progress, 0, 368276dda93cSYan, Zheng sizeof(root->root_item.drop_progress)); 368376dda93cSYan, Zheng root->root_item.drop_level = 0; 368476dda93cSYan, Zheng btrfs_set_root_refs(&root->root_item, 0); 36850b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 368676dda93cSYan, Zheng &root->root_key, &root->root_item); 368776dda93cSYan, Zheng 36883a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 368979787eaaSJeff Mahoney if (err) 369079787eaaSJeff Mahoney return err; 369179787eaaSJeff Mahoney return ret; 369276dda93cSYan, Zheng } 369376dda93cSYan, Zheng 36945d4f98a2SYan Zheng /* 36955d4f98a2SYan Zheng * recover relocation interrupted by system crash. 36965d4f98a2SYan Zheng * 36975d4f98a2SYan Zheng * this function resumes merging reloc trees with corresponding fs trees. 36985d4f98a2SYan Zheng * this is important for keeping the sharing of tree blocks 36995d4f98a2SYan Zheng */ 37005d4f98a2SYan Zheng int btrfs_recover_relocation(struct btrfs_root *root) 37015d4f98a2SYan Zheng { 37020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 37035d4f98a2SYan Zheng LIST_HEAD(reloc_roots); 37045d4f98a2SYan Zheng struct btrfs_key key; 37055d4f98a2SYan Zheng struct btrfs_root *fs_root; 37065d4f98a2SYan Zheng struct btrfs_root *reloc_root; 37075d4f98a2SYan Zheng struct btrfs_path *path; 37085d4f98a2SYan Zheng struct extent_buffer *leaf; 37095d4f98a2SYan Zheng struct reloc_control *rc = NULL; 37105d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 37115d4f98a2SYan Zheng int ret; 37125d4f98a2SYan Zheng int err = 0; 37135d4f98a2SYan Zheng 37145d4f98a2SYan Zheng path = btrfs_alloc_path(); 37155d4f98a2SYan Zheng if (!path) 37165d4f98a2SYan Zheng return -ENOMEM; 3717e4058b54SDavid Sterba path->reada = READA_BACK; 37185d4f98a2SYan Zheng 37195d4f98a2SYan Zheng key.objectid = BTRFS_TREE_RELOC_OBJECTID; 37205d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 37215d4f98a2SYan Zheng key.offset = (u64)-1; 37225d4f98a2SYan Zheng 37235d4f98a2SYan Zheng while (1) { 37240b246afaSJeff Mahoney ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, 37255d4f98a2SYan Zheng path, 0, 0); 37265d4f98a2SYan Zheng if (ret < 0) { 37275d4f98a2SYan Zheng err = ret; 37285d4f98a2SYan Zheng goto out; 37295d4f98a2SYan Zheng } 37305d4f98a2SYan Zheng if (ret > 0) { 37315d4f98a2SYan Zheng if (path->slots[0] == 0) 37325d4f98a2SYan Zheng break; 37335d4f98a2SYan Zheng path->slots[0]--; 37345d4f98a2SYan Zheng } 37355d4f98a2SYan Zheng leaf = path->nodes[0]; 37365d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 3737b3b4aa74SDavid Sterba btrfs_release_path(path); 37385d4f98a2SYan Zheng 37395d4f98a2SYan Zheng if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || 37405d4f98a2SYan Zheng key.type != BTRFS_ROOT_ITEM_KEY) 37415d4f98a2SYan Zheng break; 37425d4f98a2SYan Zheng 37433dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(root, &key); 37445d4f98a2SYan Zheng if (IS_ERR(reloc_root)) { 37455d4f98a2SYan Zheng err = PTR_ERR(reloc_root); 37465d4f98a2SYan Zheng goto out; 37475d4f98a2SYan Zheng } 37485d4f98a2SYan Zheng 374992a7cc42SQu Wenruo set_bit(BTRFS_ROOT_SHAREABLE, &reloc_root->state); 37505d4f98a2SYan Zheng list_add(&reloc_root->root_list, &reloc_roots); 37515d4f98a2SYan Zheng 37525d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 3753a820feb5SDavid Sterba fs_root = btrfs_get_fs_root(fs_info, 3754a820feb5SDavid Sterba reloc_root->root_key.offset, false); 37555d4f98a2SYan Zheng if (IS_ERR(fs_root)) { 375676dda93cSYan, Zheng ret = PTR_ERR(fs_root); 375776dda93cSYan, Zheng if (ret != -ENOENT) { 375876dda93cSYan, Zheng err = ret; 37595d4f98a2SYan Zheng goto out; 37605d4f98a2SYan Zheng } 376179787eaaSJeff Mahoney ret = mark_garbage_root(reloc_root); 376279787eaaSJeff Mahoney if (ret < 0) { 376379787eaaSJeff Mahoney err = ret; 376479787eaaSJeff Mahoney goto out; 376579787eaaSJeff Mahoney } 3766932fd26dSJosef Bacik } else { 376700246528SJosef Bacik btrfs_put_root(fs_root); 376876dda93cSYan, Zheng } 37695d4f98a2SYan Zheng } 37705d4f98a2SYan Zheng 37715d4f98a2SYan Zheng if (key.offset == 0) 37725d4f98a2SYan Zheng break; 37735d4f98a2SYan Zheng 37745d4f98a2SYan Zheng key.offset--; 37755d4f98a2SYan Zheng } 3776b3b4aa74SDavid Sterba btrfs_release_path(path); 37775d4f98a2SYan Zheng 37785d4f98a2SYan Zheng if (list_empty(&reloc_roots)) 37795d4f98a2SYan Zheng goto out; 37805d4f98a2SYan Zheng 3781c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 37825d4f98a2SYan Zheng if (!rc) { 37835d4f98a2SYan Zheng err = -ENOMEM; 37845d4f98a2SYan Zheng goto out; 37855d4f98a2SYan Zheng } 37865d4f98a2SYan Zheng 37870b246afaSJeff Mahoney rc->extent_root = fs_info->extent_root; 37885d4f98a2SYan Zheng 37895d4f98a2SYan Zheng set_reloc_control(rc); 37905d4f98a2SYan Zheng 37917a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 37923612b495STsutomu Itoh if (IS_ERR(trans)) { 37933612b495STsutomu Itoh err = PTR_ERR(trans); 3794fb2d83eeSJosef Bacik goto out_unset; 37953612b495STsutomu Itoh } 37963fd0a558SYan, Zheng 37973fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 37983fd0a558SYan, Zheng 37995d4f98a2SYan Zheng while (!list_empty(&reloc_roots)) { 38005d4f98a2SYan Zheng reloc_root = list_entry(reloc_roots.next, 38015d4f98a2SYan Zheng struct btrfs_root, root_list); 38025d4f98a2SYan Zheng list_del(&reloc_root->root_list); 38035d4f98a2SYan Zheng 38045d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) == 0) { 38055d4f98a2SYan Zheng list_add_tail(&reloc_root->root_list, 38065d4f98a2SYan Zheng &rc->reloc_roots); 38075d4f98a2SYan Zheng continue; 38085d4f98a2SYan Zheng } 38095d4f98a2SYan Zheng 3810a820feb5SDavid Sterba fs_root = btrfs_get_fs_root(fs_info, reloc_root->root_key.offset, 3811a820feb5SDavid Sterba false); 381279787eaaSJeff Mahoney if (IS_ERR(fs_root)) { 381379787eaaSJeff Mahoney err = PTR_ERR(fs_root); 3814ca1aa281SJosef Bacik list_add_tail(&reloc_root->root_list, &reloc_roots); 38151402d17dSXiyu Yang btrfs_end_transaction(trans); 3816fb2d83eeSJosef Bacik goto out_unset; 381779787eaaSJeff Mahoney } 38185d4f98a2SYan Zheng 3819ffd7b339SJeff Mahoney err = __add_reloc_root(reloc_root); 382079787eaaSJeff Mahoney BUG_ON(err < 0); /* -ENOMEM or logic error */ 3821f44deb74SJosef Bacik fs_root->reloc_root = btrfs_grab_root(reloc_root); 382200246528SJosef Bacik btrfs_put_root(fs_root); 38235d4f98a2SYan Zheng } 38245d4f98a2SYan Zheng 38253a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 382679787eaaSJeff Mahoney if (err) 3827fb2d83eeSJosef Bacik goto out_unset; 38285d4f98a2SYan Zheng 38295d4f98a2SYan Zheng merge_reloc_roots(rc); 38305d4f98a2SYan Zheng 38315d4f98a2SYan Zheng unset_reloc_control(rc); 38325d4f98a2SYan Zheng 38337a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 383462b99540SQu Wenruo if (IS_ERR(trans)) { 38353612b495STsutomu Itoh err = PTR_ERR(trans); 38366217b0faSJosef Bacik goto out_clean; 383762b99540SQu Wenruo } 38383a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 38396217b0faSJosef Bacik out_clean: 3840d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3841d2311e69SQu Wenruo if (ret < 0 && !err) 3842d2311e69SQu Wenruo err = ret; 3843fb2d83eeSJosef Bacik out_unset: 3844fb2d83eeSJosef Bacik unset_reloc_control(rc); 38451a0afa0eSJosef Bacik free_reloc_control(rc); 38463612b495STsutomu Itoh out: 3847aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 3848aca1bba6SLiu Bo 38495d4f98a2SYan Zheng btrfs_free_path(path); 38505d4f98a2SYan Zheng 38515d4f98a2SYan Zheng if (err == 0) { 38525d4f98a2SYan Zheng /* cleanup orphan inode in data relocation tree */ 3853aeb935a4SQu Wenruo fs_root = btrfs_grab_root(fs_info->data_reloc_root); 3854aeb935a4SQu Wenruo ASSERT(fs_root); 385566b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_root); 385600246528SJosef Bacik btrfs_put_root(fs_root); 3857932fd26dSJosef Bacik } 38585d4f98a2SYan Zheng return err; 38595d4f98a2SYan Zheng } 38605d4f98a2SYan Zheng 38615d4f98a2SYan Zheng /* 38625d4f98a2SYan Zheng * helper to add ordered checksum for data relocation. 38635d4f98a2SYan Zheng * 38645d4f98a2SYan Zheng * cloning checksum properly handles the nodatasum extents. 38655d4f98a2SYan Zheng * it also saves CPU time to re-calculate the checksum. 38665d4f98a2SYan Zheng */ 38677bfa9535SNikolay Borisov int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len) 38685d4f98a2SYan Zheng { 38697bfa9535SNikolay Borisov struct btrfs_fs_info *fs_info = inode->root->fs_info; 38705d4f98a2SYan Zheng struct btrfs_ordered_sum *sums; 38715d4f98a2SYan Zheng struct btrfs_ordered_extent *ordered; 38725d4f98a2SYan Zheng int ret; 38735d4f98a2SYan Zheng u64 disk_bytenr; 38744577b014SJosef Bacik u64 new_bytenr; 38755d4f98a2SYan Zheng LIST_HEAD(list); 38765d4f98a2SYan Zheng 38777bfa9535SNikolay Borisov ordered = btrfs_lookup_ordered_extent(inode, file_pos); 3878bffe633eSOmar Sandoval BUG_ON(ordered->file_offset != file_pos || ordered->num_bytes != len); 38795d4f98a2SYan Zheng 38807bfa9535SNikolay Borisov disk_bytenr = file_pos + inode->index_cnt; 38810b246afaSJeff Mahoney ret = btrfs_lookup_csums_range(fs_info->csum_root, disk_bytenr, 3882a2de733cSArne Jansen disk_bytenr + len - 1, &list, 0); 388379787eaaSJeff Mahoney if (ret) 388479787eaaSJeff Mahoney goto out; 38855d4f98a2SYan Zheng 38865d4f98a2SYan Zheng while (!list_empty(&list)) { 38875d4f98a2SYan Zheng sums = list_entry(list.next, struct btrfs_ordered_sum, list); 38885d4f98a2SYan Zheng list_del_init(&sums->list); 38895d4f98a2SYan Zheng 38904577b014SJosef Bacik /* 38914577b014SJosef Bacik * We need to offset the new_bytenr based on where the csum is. 38924577b014SJosef Bacik * We need to do this because we will read in entire prealloc 38934577b014SJosef Bacik * extents but we may have written to say the middle of the 38944577b014SJosef Bacik * prealloc extent, so we need to make sure the csum goes with 38954577b014SJosef Bacik * the right disk offset. 38964577b014SJosef Bacik * 38974577b014SJosef Bacik * We can do this because the data reloc inode refers strictly 38984577b014SJosef Bacik * to the on disk bytes, so we don't have to worry about 38994577b014SJosef Bacik * disk_len vs real len like with real inodes since it's all 39004577b014SJosef Bacik * disk length. 39014577b014SJosef Bacik */ 3902bffe633eSOmar Sandoval new_bytenr = ordered->disk_bytenr + sums->bytenr - disk_bytenr; 39034577b014SJosef Bacik sums->bytenr = new_bytenr; 39045d4f98a2SYan Zheng 3905f9756261SNikolay Borisov btrfs_add_ordered_sum(ordered, sums); 39065d4f98a2SYan Zheng } 390779787eaaSJeff Mahoney out: 39085d4f98a2SYan Zheng btrfs_put_ordered_extent(ordered); 3909411fc6bcSAndi Kleen return ret; 39105d4f98a2SYan Zheng } 39113fd0a558SYan, Zheng 391283d4cfd4SJosef Bacik int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 39133fd0a558SYan, Zheng struct btrfs_root *root, struct extent_buffer *buf, 39143fd0a558SYan, Zheng struct extent_buffer *cow) 39153fd0a558SYan, Zheng { 39160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 39173fd0a558SYan, Zheng struct reloc_control *rc; 3918a26195a5SQu Wenruo struct btrfs_backref_node *node; 39193fd0a558SYan, Zheng int first_cow = 0; 39203fd0a558SYan, Zheng int level; 392183d4cfd4SJosef Bacik int ret = 0; 39223fd0a558SYan, Zheng 39230b246afaSJeff Mahoney rc = fs_info->reloc_ctl; 39243fd0a558SYan, Zheng if (!rc) 392583d4cfd4SJosef Bacik return 0; 39263fd0a558SYan, Zheng 39273fd0a558SYan, Zheng BUG_ON(rc->stage == UPDATE_DATA_PTRS && 39283fd0a558SYan, Zheng root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); 39293fd0a558SYan, Zheng 39303fd0a558SYan, Zheng level = btrfs_header_level(buf); 39313fd0a558SYan, Zheng if (btrfs_header_generation(buf) <= 39323fd0a558SYan, Zheng btrfs_root_last_snapshot(&root->root_item)) 39333fd0a558SYan, Zheng first_cow = 1; 39343fd0a558SYan, Zheng 39353fd0a558SYan, Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && 39363fd0a558SYan, Zheng rc->create_reloc_tree) { 39373fd0a558SYan, Zheng WARN_ON(!first_cow && level == 0); 39383fd0a558SYan, Zheng 39393fd0a558SYan, Zheng node = rc->backref_cache.path[level]; 39403fd0a558SYan, Zheng BUG_ON(node->bytenr != buf->start && 39413fd0a558SYan, Zheng node->new_bytenr != buf->start); 39423fd0a558SYan, Zheng 3943b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 394467439dadSDavid Sterba atomic_inc(&cow->refs); 39453fd0a558SYan, Zheng node->eb = cow; 39463fd0a558SYan, Zheng node->new_bytenr = cow->start; 39473fd0a558SYan, Zheng 39483fd0a558SYan, Zheng if (!node->pending) { 39493fd0a558SYan, Zheng list_move_tail(&node->list, 39503fd0a558SYan, Zheng &rc->backref_cache.pending[level]); 39513fd0a558SYan, Zheng node->pending = 1; 39523fd0a558SYan, Zheng } 39533fd0a558SYan, Zheng 39543fd0a558SYan, Zheng if (first_cow) 39559569cc20SQu Wenruo mark_block_processed(rc, node); 39563fd0a558SYan, Zheng 39573fd0a558SYan, Zheng if (first_cow && level > 0) 39583fd0a558SYan, Zheng rc->nodes_relocated += buf->len; 39593fd0a558SYan, Zheng } 39603fd0a558SYan, Zheng 396183d4cfd4SJosef Bacik if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) 39623fd0a558SYan, Zheng ret = replace_file_extents(trans, rc, root, cow); 396383d4cfd4SJosef Bacik return ret; 39643fd0a558SYan, Zheng } 39653fd0a558SYan, Zheng 39663fd0a558SYan, Zheng /* 39673fd0a558SYan, Zheng * called before creating snapshot. it calculates metadata reservation 396801327610SNicholas D Steeves * required for relocating tree blocks in the snapshot 39693fd0a558SYan, Zheng */ 3970147d256eSZhaolei void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 39713fd0a558SYan, Zheng u64 *bytes_to_reserve) 39723fd0a558SYan, Zheng { 397310995c04SQu Wenruo struct btrfs_root *root = pending->root; 397410995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 39753fd0a558SYan, Zheng 39766282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 39773fd0a558SYan, Zheng return; 39783fd0a558SYan, Zheng 39793fd0a558SYan, Zheng if (!rc->merge_reloc_tree) 39803fd0a558SYan, Zheng return; 39813fd0a558SYan, Zheng 39823fd0a558SYan, Zheng root = root->reloc_root; 39833fd0a558SYan, Zheng BUG_ON(btrfs_root_refs(&root->root_item) == 0); 39843fd0a558SYan, Zheng /* 39853fd0a558SYan, Zheng * relocation is in the stage of merging trees. the space 39863fd0a558SYan, Zheng * used by merging a reloc tree is twice the size of 39873fd0a558SYan, Zheng * relocated tree nodes in the worst case. half for cowing 39883fd0a558SYan, Zheng * the reloc tree, half for cowing the fs tree. the space 39893fd0a558SYan, Zheng * used by cowing the reloc tree will be freed after the 39903fd0a558SYan, Zheng * tree is dropped. if we create snapshot, cowing the fs 39913fd0a558SYan, Zheng * tree may use more space than it frees. so we need 39923fd0a558SYan, Zheng * reserve extra space. 39933fd0a558SYan, Zheng */ 39943fd0a558SYan, Zheng *bytes_to_reserve += rc->nodes_relocated; 39953fd0a558SYan, Zheng } 39963fd0a558SYan, Zheng 39973fd0a558SYan, Zheng /* 39983fd0a558SYan, Zheng * called after snapshot is created. migrate block reservation 39993fd0a558SYan, Zheng * and create reloc root for the newly created snapshot 4000f44deb74SJosef Bacik * 4001f44deb74SJosef Bacik * This is similar to btrfs_init_reloc_root(), we come out of here with two 4002f44deb74SJosef Bacik * references held on the reloc_root, one for root->reloc_root and one for 4003f44deb74SJosef Bacik * rc->reloc_roots. 40043fd0a558SYan, Zheng */ 400549b25e05SJeff Mahoney int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 40063fd0a558SYan, Zheng struct btrfs_pending_snapshot *pending) 40073fd0a558SYan, Zheng { 40083fd0a558SYan, Zheng struct btrfs_root *root = pending->root; 40093fd0a558SYan, Zheng struct btrfs_root *reloc_root; 40103fd0a558SYan, Zheng struct btrfs_root *new_root; 401110995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 40123fd0a558SYan, Zheng int ret; 40133fd0a558SYan, Zheng 40146282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 401549b25e05SJeff Mahoney return 0; 40163fd0a558SYan, Zheng 40173fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 40183fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated; 40193fd0a558SYan, Zheng 40203fd0a558SYan, Zheng if (rc->merge_reloc_tree) { 40213fd0a558SYan, Zheng ret = btrfs_block_rsv_migrate(&pending->block_rsv, 40223fd0a558SYan, Zheng rc->block_rsv, 40233a584174SLu Fengqi rc->nodes_relocated, true); 402449b25e05SJeff Mahoney if (ret) 402549b25e05SJeff Mahoney return ret; 40263fd0a558SYan, Zheng } 40273fd0a558SYan, Zheng 40283fd0a558SYan, Zheng new_root = pending->snap; 40293fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root->reloc_root, 40303fd0a558SYan, Zheng new_root->root_key.objectid); 403149b25e05SJeff Mahoney if (IS_ERR(reloc_root)) 403249b25e05SJeff Mahoney return PTR_ERR(reloc_root); 40333fd0a558SYan, Zheng 4034ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 4035ffd7b339SJeff Mahoney BUG_ON(ret < 0); 4036f44deb74SJosef Bacik new_root->reloc_root = btrfs_grab_root(reloc_root); 40373fd0a558SYan, Zheng 403849b25e05SJeff Mahoney if (rc->create_reloc_tree) 40393fd0a558SYan, Zheng ret = clone_backref_node(trans, rc, root, reloc_root); 404049b25e05SJeff Mahoney return ret; 40413fd0a558SYan, Zheng } 4042