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 32427cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &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 static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, 3695d4f98a2SYan Zheng u64 root_objectid) 3705d4f98a2SYan Zheng { 3715d4f98a2SYan Zheng struct btrfs_key key; 3725d4f98a2SYan Zheng 3735d4f98a2SYan Zheng key.objectid = root_objectid; 3745d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 3755d4f98a2SYan Zheng key.offset = (u64)-1; 3765d4f98a2SYan Zheng 377bc44d7c4SJosef Bacik return btrfs_get_fs_root(fs_info, &key, false); 3785d4f98a2SYan Zheng } 3795d4f98a2SYan Zheng 3805d4f98a2SYan Zheng /* 38129db137bSQu Wenruo * For useless nodes, do two major clean ups: 38229db137bSQu Wenruo * 38329db137bSQu Wenruo * - Cleanup the children edges and nodes 38429db137bSQu Wenruo * If child node is also orphan (no parent) during cleanup, then the child 38529db137bSQu Wenruo * node will also be cleaned up. 38629db137bSQu Wenruo * 38729db137bSQu Wenruo * - Freeing up leaves (level 0), keeps nodes detached 38829db137bSQu Wenruo * For nodes, the node is still cached as "detached" 38929db137bSQu Wenruo * 39029db137bSQu Wenruo * Return false if @node is not in the @useless_nodes list. 39129db137bSQu Wenruo * Return true if @node is in the @useless_nodes list. 39229db137bSQu Wenruo */ 39329db137bSQu Wenruo static bool handle_useless_nodes(struct reloc_control *rc, 394a26195a5SQu Wenruo struct btrfs_backref_node *node) 39529db137bSQu Wenruo { 396a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 39729db137bSQu Wenruo struct list_head *useless_node = &cache->useless_node; 39829db137bSQu Wenruo bool ret = false; 39929db137bSQu Wenruo 40029db137bSQu Wenruo while (!list_empty(useless_node)) { 401a26195a5SQu Wenruo struct btrfs_backref_node *cur; 40229db137bSQu Wenruo 403a26195a5SQu Wenruo cur = list_first_entry(useless_node, struct btrfs_backref_node, 40429db137bSQu Wenruo list); 40529db137bSQu Wenruo list_del_init(&cur->list); 40629db137bSQu Wenruo 40729db137bSQu Wenruo /* Only tree root nodes can be added to @useless_nodes */ 40829db137bSQu Wenruo ASSERT(list_empty(&cur->upper)); 40929db137bSQu Wenruo 41029db137bSQu Wenruo if (cur == node) 41129db137bSQu Wenruo ret = true; 41229db137bSQu Wenruo 41329db137bSQu Wenruo /* The node is the lowest node */ 41429db137bSQu Wenruo if (cur->lowest) { 41529db137bSQu Wenruo list_del_init(&cur->lower); 41629db137bSQu Wenruo cur->lowest = 0; 41729db137bSQu Wenruo } 41829db137bSQu Wenruo 41929db137bSQu Wenruo /* Cleanup the lower edges */ 42029db137bSQu Wenruo while (!list_empty(&cur->lower)) { 421a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 422a26195a5SQu Wenruo struct btrfs_backref_node *lower; 42329db137bSQu Wenruo 42429db137bSQu Wenruo edge = list_entry(cur->lower.next, 425a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 42629db137bSQu Wenruo list_del(&edge->list[UPPER]); 42729db137bSQu Wenruo list_del(&edge->list[LOWER]); 42829db137bSQu Wenruo lower = edge->node[LOWER]; 429741188d3SQu Wenruo btrfs_backref_free_edge(cache, edge); 43029db137bSQu Wenruo 43129db137bSQu Wenruo /* Child node is also orphan, queue for cleanup */ 43229db137bSQu Wenruo if (list_empty(&lower->upper)) 43329db137bSQu Wenruo list_add(&lower->list, useless_node); 43429db137bSQu Wenruo } 43529db137bSQu Wenruo /* Mark this block processed for relocation */ 43629db137bSQu Wenruo mark_block_processed(rc, cur); 43729db137bSQu Wenruo 43829db137bSQu Wenruo /* 43929db137bSQu Wenruo * Backref nodes for tree leaves are deleted from the cache. 44029db137bSQu Wenruo * Backref nodes for upper level tree blocks are left in the 44129db137bSQu Wenruo * cache to avoid unnecessary backref lookup. 44229db137bSQu Wenruo */ 44329db137bSQu Wenruo if (cur->level > 0) { 44429db137bSQu Wenruo list_add(&cur->list, &cache->detached); 44529db137bSQu Wenruo cur->detached = 1; 44629db137bSQu Wenruo } else { 44729db137bSQu Wenruo rb_erase(&cur->rb_node, &cache->rb_root); 448741188d3SQu Wenruo btrfs_backref_free_node(cache, cur); 44929db137bSQu Wenruo } 45029db137bSQu Wenruo } 45129db137bSQu Wenruo return ret; 45229db137bSQu Wenruo } 45329db137bSQu Wenruo 45429db137bSQu Wenruo /* 455e7d571c7SQu Wenruo * Build backref tree for a given tree block. Root of the backref tree 456e7d571c7SQu Wenruo * corresponds the tree block, leaves of the backref tree correspond roots of 457e7d571c7SQu Wenruo * b-trees that reference the tree block. 458e7d571c7SQu Wenruo * 459e7d571c7SQu Wenruo * The basic idea of this function is check backrefs of a given block to find 460e7d571c7SQu Wenruo * upper level blocks that reference the block, and then check backrefs of 461e7d571c7SQu Wenruo * these upper level blocks recursively. The recursion stops when tree root is 462e7d571c7SQu Wenruo * reached or backrefs for the block is cached. 463e7d571c7SQu Wenruo * 464e7d571c7SQu Wenruo * NOTE: if we find that backrefs for a block are cached, we know backrefs for 465e7d571c7SQu Wenruo * all upper level blocks that directly/indirectly reference the block are also 466e7d571c7SQu Wenruo * cached. 467e7d571c7SQu Wenruo */ 468a26195a5SQu Wenruo static noinline_for_stack struct btrfs_backref_node *build_backref_tree( 469e7d571c7SQu Wenruo struct reloc_control *rc, struct btrfs_key *node_key, 470e7d571c7SQu Wenruo int level, u64 bytenr) 471e7d571c7SQu Wenruo { 472e7d571c7SQu Wenruo struct btrfs_backref_iter *iter; 473a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 474e7d571c7SQu Wenruo /* For searching parent of TREE_BLOCK_REF */ 475e7d571c7SQu Wenruo struct btrfs_path *path; 476a26195a5SQu Wenruo struct btrfs_backref_node *cur; 477a26195a5SQu Wenruo struct btrfs_backref_node *upper; 478a26195a5SQu Wenruo struct btrfs_backref_node *lower; 479a26195a5SQu Wenruo struct btrfs_backref_node *node = NULL; 480a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 481e7d571c7SQu Wenruo int ret; 482e7d571c7SQu Wenruo int err = 0; 483e7d571c7SQu Wenruo 484e7d571c7SQu Wenruo iter = btrfs_backref_iter_alloc(rc->extent_root->fs_info, GFP_NOFS); 485e7d571c7SQu Wenruo if (!iter) 486e7d571c7SQu Wenruo return ERR_PTR(-ENOMEM); 487e7d571c7SQu Wenruo path = btrfs_alloc_path(); 488e7d571c7SQu Wenruo if (!path) { 489e7d571c7SQu Wenruo err = -ENOMEM; 490e7d571c7SQu Wenruo goto out; 491e7d571c7SQu Wenruo } 492e7d571c7SQu Wenruo 493b1818dabSQu Wenruo node = btrfs_backref_alloc_node(cache, bytenr, level); 494e7d571c7SQu Wenruo if (!node) { 495e7d571c7SQu Wenruo err = -ENOMEM; 496e7d571c7SQu Wenruo goto out; 497e7d571c7SQu Wenruo } 498e7d571c7SQu Wenruo 499e7d571c7SQu Wenruo node->lowest = 1; 500e7d571c7SQu Wenruo cur = node; 501e7d571c7SQu Wenruo 502e7d571c7SQu Wenruo /* Breadth-first search to build backref cache */ 503e7d571c7SQu Wenruo do { 5041b60d2ecSQu Wenruo ret = btrfs_backref_add_tree_node(cache, path, iter, node_key, 5051b60d2ecSQu Wenruo cur); 506e7d571c7SQu Wenruo if (ret < 0) { 507e7d571c7SQu Wenruo err = ret; 508e7d571c7SQu Wenruo goto out; 509e7d571c7SQu Wenruo } 510e7d571c7SQu Wenruo edge = list_first_entry_or_null(&cache->pending_edge, 511a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 512e7d571c7SQu Wenruo /* 513e7d571c7SQu Wenruo * The pending list isn't empty, take the first block to 514e7d571c7SQu Wenruo * process 515e7d571c7SQu Wenruo */ 516e7d571c7SQu Wenruo if (edge) { 5175d4f98a2SYan Zheng list_del_init(&edge->list[UPPER]); 5185d4f98a2SYan Zheng cur = edge->node[UPPER]; 5195d4f98a2SYan Zheng } 520e7d571c7SQu Wenruo } while (edge); 5215d4f98a2SYan Zheng 5221f872924SQu Wenruo /* Finish the upper linkage of newly added edges/nodes */ 523fc997ed0SQu Wenruo ret = btrfs_backref_finish_upper_links(cache, node); 5241f872924SQu Wenruo if (ret < 0) { 5251f872924SQu Wenruo err = ret; 52675bfb9afSJosef Bacik goto out; 52775bfb9afSJosef Bacik } 52875bfb9afSJosef Bacik 52929db137bSQu Wenruo if (handle_useless_nodes(rc, node)) 5303fd0a558SYan, Zheng node = NULL; 5315d4f98a2SYan Zheng out: 53271f572a9SQu Wenruo btrfs_backref_iter_free(iter); 53371f572a9SQu Wenruo btrfs_free_path(path); 5345d4f98a2SYan Zheng if (err) { 53584780289SQu Wenruo while (!list_empty(&cache->useless_node)) { 53684780289SQu Wenruo lower = list_first_entry(&cache->useless_node, 537a26195a5SQu Wenruo struct btrfs_backref_node, list); 53875bfb9afSJosef Bacik list_del_init(&lower->list); 5393fd0a558SYan, Zheng } 54084780289SQu Wenruo while (!list_empty(&cache->pending_edge)) { 54184780289SQu Wenruo edge = list_first_entry(&cache->pending_edge, 542a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 54375bfb9afSJosef Bacik list_del(&edge->list[UPPER]); 5443fd0a558SYan, Zheng list_del(&edge->list[LOWER]); 54575bfb9afSJosef Bacik lower = edge->node[LOWER]; 5465d4f98a2SYan Zheng upper = edge->node[UPPER]; 547741188d3SQu Wenruo btrfs_backref_free_edge(cache, edge); 54875bfb9afSJosef Bacik 54975bfb9afSJosef Bacik /* 55075bfb9afSJosef Bacik * Lower is no longer linked to any upper backref nodes 55175bfb9afSJosef Bacik * and isn't in the cache, we can free it ourselves. 55275bfb9afSJosef Bacik */ 55375bfb9afSJosef Bacik if (list_empty(&lower->upper) && 55475bfb9afSJosef Bacik RB_EMPTY_NODE(&lower->rb_node)) 55584780289SQu Wenruo list_add(&lower->list, &cache->useless_node); 55675bfb9afSJosef Bacik 55775bfb9afSJosef Bacik if (!RB_EMPTY_NODE(&upper->rb_node)) 55875bfb9afSJosef Bacik continue; 55975bfb9afSJosef Bacik 56001327610SNicholas D Steeves /* Add this guy's upper edges to the list to process */ 56175bfb9afSJosef Bacik list_for_each_entry(edge, &upper->upper, list[LOWER]) 56284780289SQu Wenruo list_add_tail(&edge->list[UPPER], 56384780289SQu Wenruo &cache->pending_edge); 56475bfb9afSJosef Bacik if (list_empty(&upper->upper)) 56584780289SQu Wenruo list_add(&upper->list, &cache->useless_node); 56675bfb9afSJosef Bacik } 56775bfb9afSJosef Bacik 56884780289SQu Wenruo while (!list_empty(&cache->useless_node)) { 56984780289SQu Wenruo lower = list_first_entry(&cache->useless_node, 570a26195a5SQu Wenruo struct btrfs_backref_node, list); 57175bfb9afSJosef Bacik list_del_init(&lower->list); 5720fd8c3daSLiu Bo if (lower == node) 5730fd8c3daSLiu Bo node = NULL; 574741188d3SQu Wenruo btrfs_backref_free_node(cache, lower); 5755d4f98a2SYan Zheng } 5760fd8c3daSLiu Bo 577023acb07SQu Wenruo btrfs_backref_cleanup_node(cache, node); 57884780289SQu Wenruo ASSERT(list_empty(&cache->useless_node) && 57984780289SQu Wenruo list_empty(&cache->pending_edge)); 5805d4f98a2SYan Zheng return ERR_PTR(err); 5815d4f98a2SYan Zheng } 58275bfb9afSJosef Bacik ASSERT(!node || !node->detached); 58384780289SQu Wenruo ASSERT(list_empty(&cache->useless_node) && 58484780289SQu Wenruo list_empty(&cache->pending_edge)); 5855d4f98a2SYan Zheng return node; 5865d4f98a2SYan Zheng } 5875d4f98a2SYan Zheng 5885d4f98a2SYan Zheng /* 5893fd0a558SYan, Zheng * helper to add backref node for the newly created snapshot. 5903fd0a558SYan, Zheng * the backref node is created by cloning backref node that 5913fd0a558SYan, Zheng * corresponds to root of source tree 5923fd0a558SYan, Zheng */ 5933fd0a558SYan, Zheng static int clone_backref_node(struct btrfs_trans_handle *trans, 5943fd0a558SYan, Zheng struct reloc_control *rc, 5953fd0a558SYan, Zheng struct btrfs_root *src, 5963fd0a558SYan, Zheng struct btrfs_root *dest) 5973fd0a558SYan, Zheng { 5983fd0a558SYan, Zheng struct btrfs_root *reloc_root = src->reloc_root; 599a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 600a26195a5SQu Wenruo struct btrfs_backref_node *node = NULL; 601a26195a5SQu Wenruo struct btrfs_backref_node *new_node; 602a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 603a26195a5SQu Wenruo struct btrfs_backref_edge *new_edge; 6043fd0a558SYan, Zheng struct rb_node *rb_node; 6053fd0a558SYan, Zheng 6063fd0a558SYan, Zheng if (cache->last_trans > 0) 6073fd0a558SYan, Zheng update_backref_cache(trans, cache); 6083fd0a558SYan, Zheng 609e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, src->commit_root->start); 6103fd0a558SYan, Zheng if (rb_node) { 611a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, rb_node); 6123fd0a558SYan, Zheng if (node->detached) 6133fd0a558SYan, Zheng node = NULL; 6143fd0a558SYan, Zheng else 6153fd0a558SYan, Zheng BUG_ON(node->new_bytenr != reloc_root->node->start); 6163fd0a558SYan, Zheng } 6173fd0a558SYan, Zheng 6183fd0a558SYan, Zheng if (!node) { 619e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, 6203fd0a558SYan, Zheng reloc_root->commit_root->start); 6213fd0a558SYan, Zheng if (rb_node) { 622a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, 6233fd0a558SYan, Zheng rb_node); 6243fd0a558SYan, Zheng BUG_ON(node->detached); 6253fd0a558SYan, Zheng } 6263fd0a558SYan, Zheng } 6273fd0a558SYan, Zheng 6283fd0a558SYan, Zheng if (!node) 6293fd0a558SYan, Zheng return 0; 6303fd0a558SYan, Zheng 631b1818dabSQu Wenruo new_node = btrfs_backref_alloc_node(cache, dest->node->start, 632b1818dabSQu Wenruo node->level); 6333fd0a558SYan, Zheng if (!new_node) 6343fd0a558SYan, Zheng return -ENOMEM; 6353fd0a558SYan, Zheng 6363fd0a558SYan, Zheng new_node->lowest = node->lowest; 6376848ad64SYan, Zheng new_node->checked = 1; 63800246528SJosef Bacik new_node->root = btrfs_grab_root(dest); 6390b530bc5SJosef Bacik ASSERT(new_node->root); 6403fd0a558SYan, Zheng 6413fd0a558SYan, Zheng if (!node->lowest) { 6423fd0a558SYan, Zheng list_for_each_entry(edge, &node->lower, list[UPPER]) { 64347254d07SQu Wenruo new_edge = btrfs_backref_alloc_edge(cache); 6443fd0a558SYan, Zheng if (!new_edge) 6453fd0a558SYan, Zheng goto fail; 6463fd0a558SYan, Zheng 647f39911e5SQu Wenruo btrfs_backref_link_edge(new_edge, edge->node[LOWER], 648f39911e5SQu Wenruo new_node, LINK_UPPER); 6493fd0a558SYan, Zheng } 65076b9e23dSMiao Xie } else { 65176b9e23dSMiao Xie list_add_tail(&new_node->lower, &cache->leaves); 6523fd0a558SYan, Zheng } 6533fd0a558SYan, Zheng 654e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&cache->rb_root, new_node->bytenr, 6553fd0a558SYan, Zheng &new_node->rb_node); 65643c04fb1SJeff Mahoney if (rb_node) 657982c92cbSQu Wenruo btrfs_backref_panic(trans->fs_info, new_node->bytenr, -EEXIST); 6583fd0a558SYan, Zheng 6593fd0a558SYan, Zheng if (!new_node->lowest) { 6603fd0a558SYan, Zheng list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { 6613fd0a558SYan, Zheng list_add_tail(&new_edge->list[LOWER], 6623fd0a558SYan, Zheng &new_edge->node[LOWER]->upper); 6633fd0a558SYan, Zheng } 6643fd0a558SYan, Zheng } 6653fd0a558SYan, Zheng return 0; 6663fd0a558SYan, Zheng fail: 6673fd0a558SYan, Zheng while (!list_empty(&new_node->lower)) { 6683fd0a558SYan, Zheng new_edge = list_entry(new_node->lower.next, 669a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 6703fd0a558SYan, Zheng list_del(&new_edge->list[UPPER]); 671741188d3SQu Wenruo btrfs_backref_free_edge(cache, new_edge); 6723fd0a558SYan, Zheng } 673741188d3SQu Wenruo btrfs_backref_free_node(cache, new_node); 6743fd0a558SYan, Zheng return -ENOMEM; 6753fd0a558SYan, Zheng } 6763fd0a558SYan, Zheng 6773fd0a558SYan, Zheng /* 6785d4f98a2SYan Zheng * helper to add 'address of tree root -> reloc tree' mapping 6795d4f98a2SYan Zheng */ 680ffd7b339SJeff Mahoney static int __must_check __add_reloc_root(struct btrfs_root *root) 6815d4f98a2SYan Zheng { 6820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 6835d4f98a2SYan Zheng struct rb_node *rb_node; 6845d4f98a2SYan Zheng struct mapping_node *node; 6850b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 6865d4f98a2SYan Zheng 6875d4f98a2SYan Zheng node = kmalloc(sizeof(*node), GFP_NOFS); 688ffd7b339SJeff Mahoney if (!node) 689ffd7b339SJeff Mahoney return -ENOMEM; 6905d4f98a2SYan Zheng 691ea287ab1SJosef Bacik node->bytenr = root->commit_root->start; 6925d4f98a2SYan Zheng node->data = root; 6935d4f98a2SYan Zheng 6945d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 695e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 6965d4f98a2SYan Zheng node->bytenr, &node->rb_node); 6975d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 698ffd7b339SJeff Mahoney if (rb_node) { 6990b246afaSJeff Mahoney btrfs_panic(fs_info, -EEXIST, 7005d163e0eSJeff Mahoney "Duplicate root found for start=%llu while inserting into relocation tree", 7015d163e0eSJeff Mahoney node->bytenr); 702ffd7b339SJeff Mahoney } 7035d4f98a2SYan Zheng 7045d4f98a2SYan Zheng list_add_tail(&root->root_list, &rc->reloc_roots); 7055d4f98a2SYan Zheng return 0; 7065d4f98a2SYan Zheng } 7075d4f98a2SYan Zheng 7085d4f98a2SYan Zheng /* 709c974c464SWang Shilong * helper to delete the 'address of tree root -> reloc tree' 7105d4f98a2SYan Zheng * mapping 7115d4f98a2SYan Zheng */ 712c974c464SWang Shilong static void __del_reloc_root(struct btrfs_root *root) 7135d4f98a2SYan Zheng { 7140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 7155d4f98a2SYan Zheng struct rb_node *rb_node; 7165d4f98a2SYan Zheng struct mapping_node *node = NULL; 7170b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 718f44deb74SJosef Bacik bool put_ref = false; 7195d4f98a2SYan Zheng 72065c6e82bSQu Wenruo if (rc && root->node) { 7215d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 722e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 723ea287ab1SJosef Bacik root->commit_root->start); 724c974c464SWang Shilong if (rb_node) { 725c974c464SWang Shilong node = rb_entry(rb_node, struct mapping_node, rb_node); 726c974c464SWang Shilong rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 727ea287ab1SJosef Bacik RB_CLEAR_NODE(&node->rb_node); 728c974c464SWang Shilong } 729c974c464SWang Shilong spin_unlock(&rc->reloc_root_tree.lock); 730c974c464SWang Shilong if (!node) 731c974c464SWang Shilong return; 732c974c464SWang Shilong BUG_ON((struct btrfs_root *)node->data != root); 733389305b2SQu Wenruo } 734c974c464SWang Shilong 735f44deb74SJosef Bacik /* 736f44deb74SJosef Bacik * We only put the reloc root here if it's on the list. There's a lot 737f44deb74SJosef Bacik * of places where the pattern is to splice the rc->reloc_roots, process 738f44deb74SJosef Bacik * the reloc roots, and then add the reloc root back onto 739f44deb74SJosef Bacik * rc->reloc_roots. If we call __del_reloc_root while it's off of the 740f44deb74SJosef Bacik * list we don't want the reference being dropped, because the guy 741f44deb74SJosef Bacik * messing with the list is in charge of the reference. 742f44deb74SJosef Bacik */ 7430b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 744f44deb74SJosef Bacik if (!list_empty(&root->root_list)) { 745f44deb74SJosef Bacik put_ref = true; 746c974c464SWang Shilong list_del_init(&root->root_list); 747f44deb74SJosef Bacik } 7480b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 749f44deb74SJosef Bacik if (put_ref) 750f44deb74SJosef Bacik btrfs_put_root(root); 751c974c464SWang Shilong kfree(node); 752c974c464SWang Shilong } 753c974c464SWang Shilong 754c974c464SWang Shilong /* 755c974c464SWang Shilong * helper to update the 'address of tree root -> reloc tree' 756c974c464SWang Shilong * mapping 757c974c464SWang Shilong */ 758ea287ab1SJosef Bacik static int __update_reloc_root(struct btrfs_root *root) 759c974c464SWang Shilong { 7600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 761c974c464SWang Shilong struct rb_node *rb_node; 762c974c464SWang Shilong struct mapping_node *node = NULL; 7630b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 764c974c464SWang Shilong 765c974c464SWang Shilong spin_lock(&rc->reloc_root_tree.lock); 766e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 767ea287ab1SJosef Bacik root->commit_root->start); 7685d4f98a2SYan Zheng if (rb_node) { 7695d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 7705d4f98a2SYan Zheng rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 7715d4f98a2SYan Zheng } 7725d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 7735d4f98a2SYan Zheng 7748f71f3e0SLiu Bo if (!node) 7758f71f3e0SLiu Bo return 0; 7765d4f98a2SYan Zheng BUG_ON((struct btrfs_root *)node->data != root); 7775d4f98a2SYan Zheng 7785d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 779ea287ab1SJosef Bacik node->bytenr = root->node->start; 780e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 7815d4f98a2SYan Zheng node->bytenr, &node->rb_node); 7825d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 78343c04fb1SJeff Mahoney if (rb_node) 784982c92cbSQu Wenruo btrfs_backref_panic(fs_info, node->bytenr, -EEXIST); 7855d4f98a2SYan Zheng return 0; 7865d4f98a2SYan Zheng } 7875d4f98a2SYan Zheng 7883fd0a558SYan, Zheng static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, 7893fd0a558SYan, Zheng struct btrfs_root *root, u64 objectid) 7905d4f98a2SYan Zheng { 7910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 7925d4f98a2SYan Zheng struct btrfs_root *reloc_root; 7935d4f98a2SYan Zheng struct extent_buffer *eb; 7945d4f98a2SYan Zheng struct btrfs_root_item *root_item; 7955d4f98a2SYan Zheng struct btrfs_key root_key; 7965d4f98a2SYan Zheng int ret; 7975d4f98a2SYan Zheng 7985d4f98a2SYan Zheng root_item = kmalloc(sizeof(*root_item), GFP_NOFS); 7995d4f98a2SYan Zheng BUG_ON(!root_item); 8005d4f98a2SYan Zheng 8015d4f98a2SYan Zheng root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; 8025d4f98a2SYan Zheng root_key.type = BTRFS_ROOT_ITEM_KEY; 8033fd0a558SYan, Zheng root_key.offset = objectid; 8045d4f98a2SYan Zheng 8053fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 806054570a1SFilipe Manana u64 commit_root_gen; 807054570a1SFilipe Manana 8083fd0a558SYan, Zheng /* called by btrfs_init_reloc_root */ 8095d4f98a2SYan Zheng ret = btrfs_copy_root(trans, root, root->commit_root, &eb, 8105d4f98a2SYan Zheng BTRFS_TREE_RELOC_OBJECTID); 8115d4f98a2SYan Zheng BUG_ON(ret); 812054570a1SFilipe Manana /* 813054570a1SFilipe Manana * Set the last_snapshot field to the generation of the commit 814054570a1SFilipe Manana * root - like this ctree.c:btrfs_block_can_be_shared() behaves 815054570a1SFilipe Manana * correctly (returns true) when the relocation root is created 816054570a1SFilipe Manana * either inside the critical section of a transaction commit 817054570a1SFilipe Manana * (through transaction.c:qgroup_account_snapshot()) and when 818054570a1SFilipe Manana * it's created before the transaction commit is started. 819054570a1SFilipe Manana */ 820054570a1SFilipe Manana commit_root_gen = btrfs_header_generation(root->commit_root); 821054570a1SFilipe Manana btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen); 8223fd0a558SYan, Zheng } else { 8233fd0a558SYan, Zheng /* 8243fd0a558SYan, Zheng * called by btrfs_reloc_post_snapshot_hook. 8253fd0a558SYan, Zheng * the source tree is a reloc tree, all tree blocks 8263fd0a558SYan, Zheng * modified after it was created have RELOC flag 8273fd0a558SYan, Zheng * set in their headers. so it's OK to not update 8283fd0a558SYan, Zheng * the 'last_snapshot'. 8293fd0a558SYan, Zheng */ 8303fd0a558SYan, Zheng ret = btrfs_copy_root(trans, root, root->node, &eb, 8313fd0a558SYan, Zheng BTRFS_TREE_RELOC_OBJECTID); 8323fd0a558SYan, Zheng BUG_ON(ret); 8333fd0a558SYan, Zheng } 8343fd0a558SYan, Zheng 8355d4f98a2SYan Zheng memcpy(root_item, &root->root_item, sizeof(*root_item)); 8365d4f98a2SYan Zheng btrfs_set_root_bytenr(root_item, eb->start); 8375d4f98a2SYan Zheng btrfs_set_root_level(root_item, btrfs_header_level(eb)); 8385d4f98a2SYan Zheng btrfs_set_root_generation(root_item, trans->transid); 8393fd0a558SYan, Zheng 8403fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 8413fd0a558SYan, Zheng btrfs_set_root_refs(root_item, 0); 8423fd0a558SYan, Zheng memset(&root_item->drop_progress, 0, 8433fd0a558SYan, Zheng sizeof(struct btrfs_disk_key)); 8445d4f98a2SYan Zheng root_item->drop_level = 0; 8453fd0a558SYan, Zheng } 8465d4f98a2SYan Zheng 8475d4f98a2SYan Zheng btrfs_tree_unlock(eb); 8485d4f98a2SYan Zheng free_extent_buffer(eb); 8495d4f98a2SYan Zheng 8500b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, 8515d4f98a2SYan Zheng &root_key, root_item); 8525d4f98a2SYan Zheng BUG_ON(ret); 8535d4f98a2SYan Zheng kfree(root_item); 8545d4f98a2SYan Zheng 8553dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(fs_info->tree_root, &root_key); 8565d4f98a2SYan Zheng BUG_ON(IS_ERR(reloc_root)); 8573dbf1738SJosef Bacik set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state); 8585d4f98a2SYan Zheng reloc_root->last_trans = trans->transid; 8593fd0a558SYan, Zheng return reloc_root; 8603fd0a558SYan, Zheng } 8613fd0a558SYan, Zheng 8623fd0a558SYan, Zheng /* 8633fd0a558SYan, Zheng * create reloc tree for a given fs tree. reloc tree is just a 8643fd0a558SYan, Zheng * snapshot of the fs tree with special root objectid. 865f44deb74SJosef Bacik * 866f44deb74SJosef Bacik * The reloc_root comes out of here with two references, one for 867f44deb74SJosef Bacik * root->reloc_root, and another for being on the rc->reloc_roots list. 8683fd0a558SYan, Zheng */ 8693fd0a558SYan, Zheng int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 8703fd0a558SYan, Zheng struct btrfs_root *root) 8713fd0a558SYan, Zheng { 8720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 8733fd0a558SYan, Zheng struct btrfs_root *reloc_root; 8740b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 87520dd2cbfSMiao Xie struct btrfs_block_rsv *rsv; 8763fd0a558SYan, Zheng int clear_rsv = 0; 877ffd7b339SJeff Mahoney int ret; 8783fd0a558SYan, Zheng 879aec7db3bSJosef Bacik if (!rc) 8802abc726aSJosef Bacik return 0; 8812abc726aSJosef Bacik 8821fac4a54SQu Wenruo /* 8831fac4a54SQu Wenruo * The subvolume has reloc tree but the swap is finished, no need to 8841fac4a54SQu Wenruo * create/update the dead reloc tree 8851fac4a54SQu Wenruo */ 8866282675eSQu Wenruo if (reloc_root_is_dead(root)) 8871fac4a54SQu Wenruo return 0; 8881fac4a54SQu Wenruo 889aec7db3bSJosef Bacik /* 890aec7db3bSJosef Bacik * This is subtle but important. We do not do 891aec7db3bSJosef Bacik * record_root_in_transaction for reloc roots, instead we record their 892aec7db3bSJosef Bacik * corresponding fs root, and then here we update the last trans for the 893aec7db3bSJosef Bacik * reloc root. This means that we have to do this for the entire life 894aec7db3bSJosef Bacik * of the reloc root, regardless of which stage of the relocation we are 895aec7db3bSJosef Bacik * in. 896aec7db3bSJosef Bacik */ 8973fd0a558SYan, Zheng if (root->reloc_root) { 8983fd0a558SYan, Zheng reloc_root = root->reloc_root; 8993fd0a558SYan, Zheng reloc_root->last_trans = trans->transid; 9003fd0a558SYan, Zheng return 0; 9013fd0a558SYan, Zheng } 9023fd0a558SYan, Zheng 903aec7db3bSJosef Bacik /* 904aec7db3bSJosef Bacik * We are merging reloc roots, we do not need new reloc trees. Also 905aec7db3bSJosef Bacik * reloc trees never need their own reloc tree. 906aec7db3bSJosef Bacik */ 907aec7db3bSJosef Bacik if (!rc->create_reloc_tree || 908aec7db3bSJosef Bacik root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 909aec7db3bSJosef Bacik return 0; 910aec7db3bSJosef Bacik 91120dd2cbfSMiao Xie if (!trans->reloc_reserved) { 91220dd2cbfSMiao Xie rsv = trans->block_rsv; 9133fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 9143fd0a558SYan, Zheng clear_rsv = 1; 9153fd0a558SYan, Zheng } 9163fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root, root->root_key.objectid); 9173fd0a558SYan, Zheng if (clear_rsv) 91820dd2cbfSMiao Xie trans->block_rsv = rsv; 9195d4f98a2SYan Zheng 920ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 921ffd7b339SJeff Mahoney BUG_ON(ret < 0); 922f44deb74SJosef Bacik root->reloc_root = btrfs_grab_root(reloc_root); 9235d4f98a2SYan Zheng return 0; 9245d4f98a2SYan Zheng } 9255d4f98a2SYan Zheng 9265d4f98a2SYan Zheng /* 9275d4f98a2SYan Zheng * update root item of reloc tree 9285d4f98a2SYan Zheng */ 9295d4f98a2SYan Zheng int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 9305d4f98a2SYan Zheng struct btrfs_root *root) 9315d4f98a2SYan Zheng { 9320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 9335d4f98a2SYan Zheng struct btrfs_root *reloc_root; 9345d4f98a2SYan Zheng struct btrfs_root_item *root_item; 9355d4f98a2SYan Zheng int ret; 9365d4f98a2SYan Zheng 9376282675eSQu Wenruo if (!have_reloc_root(root)) 9387585717fSChris Mason goto out; 9395d4f98a2SYan Zheng 9405d4f98a2SYan Zheng reloc_root = root->reloc_root; 9415d4f98a2SYan Zheng root_item = &reloc_root->root_item; 9425d4f98a2SYan Zheng 943f44deb74SJosef Bacik /* 944f44deb74SJosef Bacik * We are probably ok here, but __del_reloc_root() will drop its ref of 945f44deb74SJosef Bacik * the root. We have the ref for root->reloc_root, but just in case 946f44deb74SJosef Bacik * hold it while we update the reloc root. 947f44deb74SJosef Bacik */ 948f44deb74SJosef Bacik btrfs_grab_root(reloc_root); 949f44deb74SJosef Bacik 950d2311e69SQu Wenruo /* root->reloc_root will stay until current relocation finished */ 9510b246afaSJeff Mahoney if (fs_info->reloc_ctl->merge_reloc_tree && 9523fd0a558SYan, Zheng btrfs_root_refs(root_item) == 0) { 953d2311e69SQu Wenruo set_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 9546282675eSQu Wenruo /* 9556282675eSQu Wenruo * Mark the tree as dead before we change reloc_root so 9566282675eSQu Wenruo * have_reloc_root will not touch it from now on. 9576282675eSQu Wenruo */ 9586282675eSQu Wenruo smp_wmb(); 959c974c464SWang Shilong __del_reloc_root(reloc_root); 9605d4f98a2SYan Zheng } 9615d4f98a2SYan Zheng 9625d4f98a2SYan Zheng if (reloc_root->commit_root != reloc_root->node) { 963ea287ab1SJosef Bacik __update_reloc_root(reloc_root); 9645d4f98a2SYan Zheng btrfs_set_root_node(root_item, reloc_root->node); 9655d4f98a2SYan Zheng free_extent_buffer(reloc_root->commit_root); 9665d4f98a2SYan Zheng reloc_root->commit_root = btrfs_root_node(reloc_root); 9675d4f98a2SYan Zheng } 9685d4f98a2SYan Zheng 9690b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 9705d4f98a2SYan Zheng &reloc_root->root_key, root_item); 9715d4f98a2SYan Zheng BUG_ON(ret); 972f44deb74SJosef Bacik btrfs_put_root(reloc_root); 9737585717fSChris Mason out: 9745d4f98a2SYan Zheng return 0; 9755d4f98a2SYan Zheng } 9765d4f98a2SYan Zheng 9775d4f98a2SYan Zheng /* 9785d4f98a2SYan Zheng * helper to find first cached inode with inode number >= objectid 9795d4f98a2SYan Zheng * in a subvolume 9805d4f98a2SYan Zheng */ 9815d4f98a2SYan Zheng static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) 9825d4f98a2SYan Zheng { 9835d4f98a2SYan Zheng struct rb_node *node; 9845d4f98a2SYan Zheng struct rb_node *prev; 9855d4f98a2SYan Zheng struct btrfs_inode *entry; 9865d4f98a2SYan Zheng struct inode *inode; 9875d4f98a2SYan Zheng 9885d4f98a2SYan Zheng spin_lock(&root->inode_lock); 9895d4f98a2SYan Zheng again: 9905d4f98a2SYan Zheng node = root->inode_tree.rb_node; 9915d4f98a2SYan Zheng prev = NULL; 9925d4f98a2SYan Zheng while (node) { 9935d4f98a2SYan Zheng prev = node; 9945d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 9955d4f98a2SYan Zheng 9964a0cc7caSNikolay Borisov if (objectid < btrfs_ino(entry)) 9975d4f98a2SYan Zheng node = node->rb_left; 9984a0cc7caSNikolay Borisov else if (objectid > btrfs_ino(entry)) 9995d4f98a2SYan Zheng node = node->rb_right; 10005d4f98a2SYan Zheng else 10015d4f98a2SYan Zheng break; 10025d4f98a2SYan Zheng } 10035d4f98a2SYan Zheng if (!node) { 10045d4f98a2SYan Zheng while (prev) { 10055d4f98a2SYan Zheng entry = rb_entry(prev, struct btrfs_inode, rb_node); 10064a0cc7caSNikolay Borisov if (objectid <= btrfs_ino(entry)) { 10075d4f98a2SYan Zheng node = prev; 10085d4f98a2SYan Zheng break; 10095d4f98a2SYan Zheng } 10105d4f98a2SYan Zheng prev = rb_next(prev); 10115d4f98a2SYan Zheng } 10125d4f98a2SYan Zheng } 10135d4f98a2SYan Zheng while (node) { 10145d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 10155d4f98a2SYan Zheng inode = igrab(&entry->vfs_inode); 10165d4f98a2SYan Zheng if (inode) { 10175d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 10185d4f98a2SYan Zheng return inode; 10195d4f98a2SYan Zheng } 10205d4f98a2SYan Zheng 10214a0cc7caSNikolay Borisov objectid = btrfs_ino(entry) + 1; 10225d4f98a2SYan Zheng if (cond_resched_lock(&root->inode_lock)) 10235d4f98a2SYan Zheng goto again; 10245d4f98a2SYan Zheng 10255d4f98a2SYan Zheng node = rb_next(node); 10265d4f98a2SYan Zheng } 10275d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 10285d4f98a2SYan Zheng return NULL; 10295d4f98a2SYan Zheng } 10305d4f98a2SYan Zheng 10315d4f98a2SYan Zheng /* 10325d4f98a2SYan Zheng * get new location of data 10335d4f98a2SYan Zheng */ 10345d4f98a2SYan Zheng static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, 10355d4f98a2SYan Zheng u64 bytenr, u64 num_bytes) 10365d4f98a2SYan Zheng { 10375d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(reloc_inode)->root; 10385d4f98a2SYan Zheng struct btrfs_path *path; 10395d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 10405d4f98a2SYan Zheng struct extent_buffer *leaf; 10415d4f98a2SYan Zheng int ret; 10425d4f98a2SYan Zheng 10435d4f98a2SYan Zheng path = btrfs_alloc_path(); 10445d4f98a2SYan Zheng if (!path) 10455d4f98a2SYan Zheng return -ENOMEM; 10465d4f98a2SYan Zheng 10475d4f98a2SYan Zheng bytenr -= BTRFS_I(reloc_inode)->index_cnt; 1048f85b7379SDavid Sterba ret = btrfs_lookup_file_extent(NULL, root, path, 1049f85b7379SDavid Sterba btrfs_ino(BTRFS_I(reloc_inode)), bytenr, 0); 10505d4f98a2SYan Zheng if (ret < 0) 10515d4f98a2SYan Zheng goto out; 10525d4f98a2SYan Zheng if (ret > 0) { 10535d4f98a2SYan Zheng ret = -ENOENT; 10545d4f98a2SYan Zheng goto out; 10555d4f98a2SYan Zheng } 10565d4f98a2SYan Zheng 10575d4f98a2SYan Zheng leaf = path->nodes[0]; 10585d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, path->slots[0], 10595d4f98a2SYan Zheng struct btrfs_file_extent_item); 10605d4f98a2SYan Zheng 10615d4f98a2SYan Zheng BUG_ON(btrfs_file_extent_offset(leaf, fi) || 10625d4f98a2SYan Zheng btrfs_file_extent_compression(leaf, fi) || 10635d4f98a2SYan Zheng btrfs_file_extent_encryption(leaf, fi) || 10645d4f98a2SYan Zheng btrfs_file_extent_other_encoding(leaf, fi)); 10655d4f98a2SYan Zheng 10665d4f98a2SYan Zheng if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { 106783d4cfd4SJosef Bacik ret = -EINVAL; 10685d4f98a2SYan Zheng goto out; 10695d4f98a2SYan Zheng } 10705d4f98a2SYan Zheng 10715d4f98a2SYan Zheng *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 10725d4f98a2SYan Zheng ret = 0; 10735d4f98a2SYan Zheng out: 10745d4f98a2SYan Zheng btrfs_free_path(path); 10755d4f98a2SYan Zheng return ret; 10765d4f98a2SYan Zheng } 10775d4f98a2SYan Zheng 10785d4f98a2SYan Zheng /* 10795d4f98a2SYan Zheng * update file extent items in the tree leaf to point to 10805d4f98a2SYan Zheng * the new locations. 10815d4f98a2SYan Zheng */ 10823fd0a558SYan, Zheng static noinline_for_stack 10833fd0a558SYan, Zheng int replace_file_extents(struct btrfs_trans_handle *trans, 10845d4f98a2SYan Zheng struct reloc_control *rc, 10855d4f98a2SYan Zheng struct btrfs_root *root, 10863fd0a558SYan, Zheng struct extent_buffer *leaf) 10875d4f98a2SYan Zheng { 10880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 10895d4f98a2SYan Zheng struct btrfs_key key; 10905d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 10915d4f98a2SYan Zheng struct inode *inode = NULL; 10925d4f98a2SYan Zheng u64 parent; 10935d4f98a2SYan Zheng u64 bytenr; 10943fd0a558SYan, Zheng u64 new_bytenr = 0; 10955d4f98a2SYan Zheng u64 num_bytes; 10965d4f98a2SYan Zheng u64 end; 10975d4f98a2SYan Zheng u32 nritems; 10985d4f98a2SYan Zheng u32 i; 109983d4cfd4SJosef Bacik int ret = 0; 11005d4f98a2SYan Zheng int first = 1; 11015d4f98a2SYan Zheng int dirty = 0; 11025d4f98a2SYan Zheng 11035d4f98a2SYan Zheng if (rc->stage != UPDATE_DATA_PTRS) 11045d4f98a2SYan Zheng return 0; 11055d4f98a2SYan Zheng 11065d4f98a2SYan Zheng /* reloc trees always use full backref */ 11075d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 11085d4f98a2SYan Zheng parent = leaf->start; 11095d4f98a2SYan Zheng else 11105d4f98a2SYan Zheng parent = 0; 11115d4f98a2SYan Zheng 11125d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 11135d4f98a2SYan Zheng for (i = 0; i < nritems; i++) { 111482fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 111582fa113fSQu Wenruo 11165d4f98a2SYan Zheng cond_resched(); 11175d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, i); 11185d4f98a2SYan Zheng if (key.type != BTRFS_EXTENT_DATA_KEY) 11195d4f98a2SYan Zheng continue; 11205d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 11215d4f98a2SYan Zheng if (btrfs_file_extent_type(leaf, fi) == 11225d4f98a2SYan Zheng BTRFS_FILE_EXTENT_INLINE) 11235d4f98a2SYan Zheng continue; 11245d4f98a2SYan Zheng bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 11255d4f98a2SYan Zheng num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); 11265d4f98a2SYan Zheng if (bytenr == 0) 11275d4f98a2SYan Zheng continue; 11289569cc20SQu Wenruo if (!in_range(bytenr, rc->block_group->start, 11299569cc20SQu Wenruo rc->block_group->length)) 11305d4f98a2SYan Zheng continue; 11315d4f98a2SYan Zheng 11325d4f98a2SYan Zheng /* 11335d4f98a2SYan Zheng * if we are modifying block in fs tree, wait for readpage 11345d4f98a2SYan Zheng * to complete and drop the extent cache 11355d4f98a2SYan Zheng */ 11365d4f98a2SYan Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 11375d4f98a2SYan Zheng if (first) { 11385d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 11395d4f98a2SYan Zheng first = 0; 11404a0cc7caSNikolay Borisov } else if (inode && btrfs_ino(BTRFS_I(inode)) < key.objectid) { 11413fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 11425d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 11435d4f98a2SYan Zheng } 11444a0cc7caSNikolay Borisov if (inode && btrfs_ino(BTRFS_I(inode)) == key.objectid) { 11455d4f98a2SYan Zheng end = key.offset + 11465d4f98a2SYan Zheng btrfs_file_extent_num_bytes(leaf, fi); 11475d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(key.offset, 11480b246afaSJeff Mahoney fs_info->sectorsize)); 11490b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 11505d4f98a2SYan Zheng end--; 11515d4f98a2SYan Zheng ret = try_lock_extent(&BTRFS_I(inode)->io_tree, 1152d0082371SJeff Mahoney key.offset, end); 11535d4f98a2SYan Zheng if (!ret) 11545d4f98a2SYan Zheng continue; 11555d4f98a2SYan Zheng 1156dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), 1157dcdbc059SNikolay Borisov key.offset, end, 1); 11585d4f98a2SYan Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 1159d0082371SJeff Mahoney key.offset, end); 11605d4f98a2SYan Zheng } 11615d4f98a2SYan Zheng } 11625d4f98a2SYan Zheng 11635d4f98a2SYan Zheng ret = get_new_location(rc->data_inode, &new_bytenr, 11645d4f98a2SYan Zheng bytenr, num_bytes); 116583d4cfd4SJosef Bacik if (ret) { 116683d4cfd4SJosef Bacik /* 116783d4cfd4SJosef Bacik * Don't have to abort since we've not changed anything 116883d4cfd4SJosef Bacik * in the file extent yet. 116983d4cfd4SJosef Bacik */ 117083d4cfd4SJosef Bacik break; 11713fd0a558SYan, Zheng } 11725d4f98a2SYan Zheng 11735d4f98a2SYan Zheng btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); 11745d4f98a2SYan Zheng dirty = 1; 11755d4f98a2SYan Zheng 11765d4f98a2SYan Zheng key.offset -= btrfs_file_extent_offset(leaf, fi); 117782fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 117882fa113fSQu Wenruo num_bytes, parent); 117982fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 118082fa113fSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1181b06c4bf5SFilipe Manana key.objectid, key.offset); 118282fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 118383d4cfd4SJosef Bacik if (ret) { 118466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 118583d4cfd4SJosef Bacik break; 118683d4cfd4SJosef Bacik } 11875d4f98a2SYan Zheng 1188ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, bytenr, 1189ffd4bb2aSQu Wenruo num_bytes, parent); 1190ffd4bb2aSQu Wenruo ref.real_root = root->root_key.objectid; 1191ffd4bb2aSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1192b06c4bf5SFilipe Manana key.objectid, key.offset); 1193ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 119483d4cfd4SJosef Bacik if (ret) { 119566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 119683d4cfd4SJosef Bacik break; 119783d4cfd4SJosef Bacik } 11985d4f98a2SYan Zheng } 11995d4f98a2SYan Zheng if (dirty) 12005d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 12013fd0a558SYan, Zheng if (inode) 12023fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 120383d4cfd4SJosef Bacik return ret; 12045d4f98a2SYan Zheng } 12055d4f98a2SYan Zheng 12065d4f98a2SYan Zheng static noinline_for_stack 12075d4f98a2SYan Zheng int memcmp_node_keys(struct extent_buffer *eb, int slot, 12085d4f98a2SYan Zheng struct btrfs_path *path, int level) 12095d4f98a2SYan Zheng { 12105d4f98a2SYan Zheng struct btrfs_disk_key key1; 12115d4f98a2SYan Zheng struct btrfs_disk_key key2; 12125d4f98a2SYan Zheng btrfs_node_key(eb, &key1, slot); 12135d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &key2, path->slots[level]); 12145d4f98a2SYan Zheng return memcmp(&key1, &key2, sizeof(key1)); 12155d4f98a2SYan Zheng } 12165d4f98a2SYan Zheng 12175d4f98a2SYan Zheng /* 12185d4f98a2SYan Zheng * try to replace tree blocks in fs tree with the new blocks 12195d4f98a2SYan Zheng * in reloc tree. tree blocks haven't been modified since the 12205d4f98a2SYan Zheng * reloc tree was create can be replaced. 12215d4f98a2SYan Zheng * 12225d4f98a2SYan Zheng * if a block was replaced, level of the block + 1 is returned. 12235d4f98a2SYan Zheng * if no block got replaced, 0 is returned. if there are other 12245d4f98a2SYan Zheng * errors, a negative error number is returned. 12255d4f98a2SYan Zheng */ 12263fd0a558SYan, Zheng static noinline_for_stack 12273d0174f7SQu Wenruo int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc, 12285d4f98a2SYan Zheng struct btrfs_root *dest, struct btrfs_root *src, 12295d4f98a2SYan Zheng struct btrfs_path *path, struct btrfs_key *next_key, 12305d4f98a2SYan Zheng int lowest_level, int max_level) 12315d4f98a2SYan Zheng { 12320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = dest->fs_info; 12335d4f98a2SYan Zheng struct extent_buffer *eb; 12345d4f98a2SYan Zheng struct extent_buffer *parent; 123582fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 12365d4f98a2SYan Zheng struct btrfs_key key; 12375d4f98a2SYan Zheng u64 old_bytenr; 12385d4f98a2SYan Zheng u64 new_bytenr; 12395d4f98a2SYan Zheng u64 old_ptr_gen; 12405d4f98a2SYan Zheng u64 new_ptr_gen; 12415d4f98a2SYan Zheng u64 last_snapshot; 12425d4f98a2SYan Zheng u32 blocksize; 12433fd0a558SYan, Zheng int cow = 0; 12445d4f98a2SYan Zheng int level; 12455d4f98a2SYan Zheng int ret; 12465d4f98a2SYan Zheng int slot; 12475d4f98a2SYan Zheng 12485d4f98a2SYan Zheng BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 12495d4f98a2SYan Zheng BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); 12505d4f98a2SYan Zheng 12515d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&src->root_item); 12523fd0a558SYan, Zheng again: 12535d4f98a2SYan Zheng slot = path->slots[lowest_level]; 12545d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); 12555d4f98a2SYan Zheng 12565d4f98a2SYan Zheng eb = btrfs_lock_root_node(dest); 12578bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12585d4f98a2SYan Zheng level = btrfs_header_level(eb); 12595d4f98a2SYan Zheng 12605d4f98a2SYan Zheng if (level < lowest_level) { 12615d4f98a2SYan Zheng btrfs_tree_unlock(eb); 12625d4f98a2SYan Zheng free_extent_buffer(eb); 12635d4f98a2SYan Zheng return 0; 12645d4f98a2SYan Zheng } 12655d4f98a2SYan Zheng 12663fd0a558SYan, Zheng if (cow) { 12675d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); 12685d4f98a2SYan Zheng BUG_ON(ret); 12693fd0a558SYan, Zheng } 12708bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12715d4f98a2SYan Zheng 12725d4f98a2SYan Zheng if (next_key) { 12735d4f98a2SYan Zheng next_key->objectid = (u64)-1; 12745d4f98a2SYan Zheng next_key->type = (u8)-1; 12755d4f98a2SYan Zheng next_key->offset = (u64)-1; 12765d4f98a2SYan Zheng } 12775d4f98a2SYan Zheng 12785d4f98a2SYan Zheng parent = eb; 12795d4f98a2SYan Zheng while (1) { 1280581c1760SQu Wenruo struct btrfs_key first_key; 1281581c1760SQu Wenruo 12825d4f98a2SYan Zheng level = btrfs_header_level(parent); 12835d4f98a2SYan Zheng BUG_ON(level < lowest_level); 12845d4f98a2SYan Zheng 12855d4f98a2SYan Zheng ret = btrfs_bin_search(parent, &key, level, &slot); 1286cbca7d59SFilipe Manana if (ret < 0) 1287cbca7d59SFilipe Manana break; 12885d4f98a2SYan Zheng if (ret && slot > 0) 12895d4f98a2SYan Zheng slot--; 12905d4f98a2SYan Zheng 12915d4f98a2SYan Zheng if (next_key && slot + 1 < btrfs_header_nritems(parent)) 12925d4f98a2SYan Zheng btrfs_node_key_to_cpu(parent, next_key, slot + 1); 12935d4f98a2SYan Zheng 12945d4f98a2SYan Zheng old_bytenr = btrfs_node_blockptr(parent, slot); 12950b246afaSJeff Mahoney blocksize = fs_info->nodesize; 12965d4f98a2SYan Zheng old_ptr_gen = btrfs_node_ptr_generation(parent, slot); 129717515f1bSQu Wenruo btrfs_node_key_to_cpu(parent, &first_key, slot); 12985d4f98a2SYan Zheng 12995d4f98a2SYan Zheng if (level <= max_level) { 13005d4f98a2SYan Zheng eb = path->nodes[level]; 13015d4f98a2SYan Zheng new_bytenr = btrfs_node_blockptr(eb, 13025d4f98a2SYan Zheng path->slots[level]); 13035d4f98a2SYan Zheng new_ptr_gen = btrfs_node_ptr_generation(eb, 13045d4f98a2SYan Zheng path->slots[level]); 13055d4f98a2SYan Zheng } else { 13065d4f98a2SYan Zheng new_bytenr = 0; 13075d4f98a2SYan Zheng new_ptr_gen = 0; 13085d4f98a2SYan Zheng } 13095d4f98a2SYan Zheng 1310fae7f21cSDulshani Gunawardhana if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) { 13115d4f98a2SYan Zheng ret = level; 13125d4f98a2SYan Zheng break; 13135d4f98a2SYan Zheng } 13145d4f98a2SYan Zheng 13155d4f98a2SYan Zheng if (new_bytenr == 0 || old_ptr_gen > last_snapshot || 13165d4f98a2SYan Zheng memcmp_node_keys(parent, slot, path, level)) { 13173fd0a558SYan, Zheng if (level <= lowest_level) { 13185d4f98a2SYan Zheng ret = 0; 13195d4f98a2SYan Zheng break; 13205d4f98a2SYan Zheng } 13215d4f98a2SYan Zheng 1322581c1760SQu Wenruo eb = read_tree_block(fs_info, old_bytenr, old_ptr_gen, 1323581c1760SQu Wenruo level - 1, &first_key); 132464c043deSLiu Bo if (IS_ERR(eb)) { 132564c043deSLiu Bo ret = PTR_ERR(eb); 1326264813acSLiu Bo break; 132764c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 132864c043deSLiu Bo ret = -EIO; 1329416bc658SJosef Bacik free_extent_buffer(eb); 1330379cde74SStefan Behrens break; 1331416bc658SJosef Bacik } 13325d4f98a2SYan Zheng btrfs_tree_lock(eb); 13333fd0a558SYan, Zheng if (cow) { 13345d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, parent, 13355d4f98a2SYan Zheng slot, &eb); 13365d4f98a2SYan Zheng BUG_ON(ret); 13375d4f98a2SYan Zheng } 13388bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 13395d4f98a2SYan Zheng 13405d4f98a2SYan Zheng btrfs_tree_unlock(parent); 13415d4f98a2SYan Zheng free_extent_buffer(parent); 13425d4f98a2SYan Zheng 13435d4f98a2SYan Zheng parent = eb; 13445d4f98a2SYan Zheng continue; 13455d4f98a2SYan Zheng } 13465d4f98a2SYan Zheng 13473fd0a558SYan, Zheng if (!cow) { 13483fd0a558SYan, Zheng btrfs_tree_unlock(parent); 13493fd0a558SYan, Zheng free_extent_buffer(parent); 13503fd0a558SYan, Zheng cow = 1; 13513fd0a558SYan, Zheng goto again; 13523fd0a558SYan, Zheng } 13533fd0a558SYan, Zheng 13545d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 13555d4f98a2SYan Zheng path->slots[level]); 1356b3b4aa74SDavid Sterba btrfs_release_path(path); 13575d4f98a2SYan Zheng 13585d4f98a2SYan Zheng path->lowest_level = level; 13595d4f98a2SYan Zheng ret = btrfs_search_slot(trans, src, &key, path, 0, 1); 13605d4f98a2SYan Zheng path->lowest_level = 0; 13615d4f98a2SYan Zheng BUG_ON(ret); 13625d4f98a2SYan Zheng 13635d4f98a2SYan Zheng /* 1364824d8dffSQu Wenruo * Info qgroup to trace both subtrees. 1365824d8dffSQu Wenruo * 1366824d8dffSQu Wenruo * We must trace both trees. 1367824d8dffSQu Wenruo * 1) Tree reloc subtree 1368824d8dffSQu Wenruo * If not traced, we will leak data numbers 1369824d8dffSQu Wenruo * 2) Fs subtree 1370824d8dffSQu Wenruo * If not traced, we will double count old data 1371f616f5cdSQu Wenruo * 1372f616f5cdSQu Wenruo * We don't scan the subtree right now, but only record 1373f616f5cdSQu Wenruo * the swapped tree blocks. 1374f616f5cdSQu Wenruo * The real subtree rescan is delayed until we have new 1375f616f5cdSQu Wenruo * CoW on the subtree root node before transaction commit. 1376824d8dffSQu Wenruo */ 1377370a11b8SQu Wenruo ret = btrfs_qgroup_add_swapped_blocks(trans, dest, 1378370a11b8SQu Wenruo rc->block_group, parent, slot, 1379370a11b8SQu Wenruo path->nodes[level], path->slots[level], 1380370a11b8SQu Wenruo last_snapshot); 1381370a11b8SQu Wenruo if (ret < 0) 1382370a11b8SQu Wenruo break; 1383824d8dffSQu Wenruo /* 13845d4f98a2SYan Zheng * swap blocks in fs tree and reloc tree. 13855d4f98a2SYan Zheng */ 13865d4f98a2SYan Zheng btrfs_set_node_blockptr(parent, slot, new_bytenr); 13875d4f98a2SYan Zheng btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); 13885d4f98a2SYan Zheng btrfs_mark_buffer_dirty(parent); 13895d4f98a2SYan Zheng 13905d4f98a2SYan Zheng btrfs_set_node_blockptr(path->nodes[level], 13915d4f98a2SYan Zheng path->slots[level], old_bytenr); 13925d4f98a2SYan Zheng btrfs_set_node_ptr_generation(path->nodes[level], 13935d4f98a2SYan Zheng path->slots[level], old_ptr_gen); 13945d4f98a2SYan Zheng btrfs_mark_buffer_dirty(path->nodes[level]); 13955d4f98a2SYan Zheng 139682fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr, 139782fa113fSQu Wenruo blocksize, path->nodes[level]->start); 139882fa113fSQu Wenruo ref.skip_qgroup = true; 139982fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 140082fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 14015d4f98a2SYan Zheng BUG_ON(ret); 140282fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 140382fa113fSQu Wenruo blocksize, 0); 140482fa113fSQu Wenruo ref.skip_qgroup = true; 140582fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 140682fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 14075d4f98a2SYan Zheng BUG_ON(ret); 14085d4f98a2SYan Zheng 1409ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, new_bytenr, 1410ffd4bb2aSQu Wenruo blocksize, path->nodes[level]->start); 1411ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 1412ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1413ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 14145d4f98a2SYan Zheng BUG_ON(ret); 14155d4f98a2SYan Zheng 1416ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, old_bytenr, 1417ffd4bb2aSQu Wenruo blocksize, 0); 1418ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 1419ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1420ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 14215d4f98a2SYan Zheng BUG_ON(ret); 14225d4f98a2SYan Zheng 14235d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 14245d4f98a2SYan Zheng 14255d4f98a2SYan Zheng ret = level; 14265d4f98a2SYan Zheng break; 14275d4f98a2SYan Zheng } 14285d4f98a2SYan Zheng btrfs_tree_unlock(parent); 14295d4f98a2SYan Zheng free_extent_buffer(parent); 14305d4f98a2SYan Zheng return ret; 14315d4f98a2SYan Zheng } 14325d4f98a2SYan Zheng 14335d4f98a2SYan Zheng /* 14345d4f98a2SYan Zheng * helper to find next relocated block in reloc tree 14355d4f98a2SYan Zheng */ 14365d4f98a2SYan Zheng static noinline_for_stack 14375d4f98a2SYan Zheng int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 14385d4f98a2SYan Zheng int *level) 14395d4f98a2SYan Zheng { 14405d4f98a2SYan Zheng struct extent_buffer *eb; 14415d4f98a2SYan Zheng int i; 14425d4f98a2SYan Zheng u64 last_snapshot; 14435d4f98a2SYan Zheng u32 nritems; 14445d4f98a2SYan Zheng 14455d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 14465d4f98a2SYan Zheng 14475d4f98a2SYan Zheng for (i = 0; i < *level; i++) { 14485d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 14495d4f98a2SYan Zheng path->nodes[i] = NULL; 14505d4f98a2SYan Zheng } 14515d4f98a2SYan Zheng 14525d4f98a2SYan Zheng for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { 14535d4f98a2SYan Zheng eb = path->nodes[i]; 14545d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 14555d4f98a2SYan Zheng while (path->slots[i] + 1 < nritems) { 14565d4f98a2SYan Zheng path->slots[i]++; 14575d4f98a2SYan Zheng if (btrfs_node_ptr_generation(eb, path->slots[i]) <= 14585d4f98a2SYan Zheng last_snapshot) 14595d4f98a2SYan Zheng continue; 14605d4f98a2SYan Zheng 14615d4f98a2SYan Zheng *level = i; 14625d4f98a2SYan Zheng return 0; 14635d4f98a2SYan Zheng } 14645d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 14655d4f98a2SYan Zheng path->nodes[i] = NULL; 14665d4f98a2SYan Zheng } 14675d4f98a2SYan Zheng return 1; 14685d4f98a2SYan Zheng } 14695d4f98a2SYan Zheng 14705d4f98a2SYan Zheng /* 14715d4f98a2SYan Zheng * walk down reloc tree to find relocated block of lowest level 14725d4f98a2SYan Zheng */ 14735d4f98a2SYan Zheng static noinline_for_stack 14745d4f98a2SYan Zheng int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 14755d4f98a2SYan Zheng int *level) 14765d4f98a2SYan Zheng { 14772ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 14785d4f98a2SYan Zheng struct extent_buffer *eb = NULL; 14795d4f98a2SYan Zheng int i; 14805d4f98a2SYan Zheng u64 bytenr; 14815d4f98a2SYan Zheng u64 ptr_gen = 0; 14825d4f98a2SYan Zheng u64 last_snapshot; 14835d4f98a2SYan Zheng u32 nritems; 14845d4f98a2SYan Zheng 14855d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 14865d4f98a2SYan Zheng 14875d4f98a2SYan Zheng for (i = *level; i > 0; i--) { 1488581c1760SQu Wenruo struct btrfs_key first_key; 1489581c1760SQu Wenruo 14905d4f98a2SYan Zheng eb = path->nodes[i]; 14915d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 14925d4f98a2SYan Zheng while (path->slots[i] < nritems) { 14935d4f98a2SYan Zheng ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); 14945d4f98a2SYan Zheng if (ptr_gen > last_snapshot) 14955d4f98a2SYan Zheng break; 14965d4f98a2SYan Zheng path->slots[i]++; 14975d4f98a2SYan Zheng } 14985d4f98a2SYan Zheng if (path->slots[i] >= nritems) { 14995d4f98a2SYan Zheng if (i == *level) 15005d4f98a2SYan Zheng break; 15015d4f98a2SYan Zheng *level = i + 1; 15025d4f98a2SYan Zheng return 0; 15035d4f98a2SYan Zheng } 15045d4f98a2SYan Zheng if (i == 1) { 15055d4f98a2SYan Zheng *level = i; 15065d4f98a2SYan Zheng return 0; 15075d4f98a2SYan Zheng } 15085d4f98a2SYan Zheng 15095d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(eb, path->slots[i]); 1510581c1760SQu Wenruo btrfs_node_key_to_cpu(eb, &first_key, path->slots[i]); 1511581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, ptr_gen, i - 1, 1512581c1760SQu Wenruo &first_key); 151364c043deSLiu Bo if (IS_ERR(eb)) { 151464c043deSLiu Bo return PTR_ERR(eb); 151564c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 1516416bc658SJosef Bacik free_extent_buffer(eb); 1517416bc658SJosef Bacik return -EIO; 1518416bc658SJosef Bacik } 15195d4f98a2SYan Zheng BUG_ON(btrfs_header_level(eb) != i - 1); 15205d4f98a2SYan Zheng path->nodes[i - 1] = eb; 15215d4f98a2SYan Zheng path->slots[i - 1] = 0; 15225d4f98a2SYan Zheng } 15235d4f98a2SYan Zheng return 1; 15245d4f98a2SYan Zheng } 15255d4f98a2SYan Zheng 15265d4f98a2SYan Zheng /* 15275d4f98a2SYan Zheng * invalidate extent cache for file extents whose key in range of 15285d4f98a2SYan Zheng * [min_key, max_key) 15295d4f98a2SYan Zheng */ 15305d4f98a2SYan Zheng static int invalidate_extent_cache(struct btrfs_root *root, 15315d4f98a2SYan Zheng struct btrfs_key *min_key, 15325d4f98a2SYan Zheng struct btrfs_key *max_key) 15335d4f98a2SYan Zheng { 15340b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 15355d4f98a2SYan Zheng struct inode *inode = NULL; 15365d4f98a2SYan Zheng u64 objectid; 15375d4f98a2SYan Zheng u64 start, end; 153833345d01SLi Zefan u64 ino; 15395d4f98a2SYan Zheng 15405d4f98a2SYan Zheng objectid = min_key->objectid; 15415d4f98a2SYan Zheng while (1) { 15425d4f98a2SYan Zheng cond_resched(); 15435d4f98a2SYan Zheng iput(inode); 15445d4f98a2SYan Zheng 15455d4f98a2SYan Zheng if (objectid > max_key->objectid) 15465d4f98a2SYan Zheng break; 15475d4f98a2SYan Zheng 15485d4f98a2SYan Zheng inode = find_next_inode(root, objectid); 15495d4f98a2SYan Zheng if (!inode) 15505d4f98a2SYan Zheng break; 15514a0cc7caSNikolay Borisov ino = btrfs_ino(BTRFS_I(inode)); 15525d4f98a2SYan Zheng 155333345d01SLi Zefan if (ino > max_key->objectid) { 15545d4f98a2SYan Zheng iput(inode); 15555d4f98a2SYan Zheng break; 15565d4f98a2SYan Zheng } 15575d4f98a2SYan Zheng 155833345d01SLi Zefan objectid = ino + 1; 15595d4f98a2SYan Zheng if (!S_ISREG(inode->i_mode)) 15605d4f98a2SYan Zheng continue; 15615d4f98a2SYan Zheng 156233345d01SLi Zefan if (unlikely(min_key->objectid == ino)) { 15635d4f98a2SYan Zheng if (min_key->type > BTRFS_EXTENT_DATA_KEY) 15645d4f98a2SYan Zheng continue; 15655d4f98a2SYan Zheng if (min_key->type < BTRFS_EXTENT_DATA_KEY) 15665d4f98a2SYan Zheng start = 0; 15675d4f98a2SYan Zheng else { 15685d4f98a2SYan Zheng start = min_key->offset; 15690b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(start, fs_info->sectorsize)); 15705d4f98a2SYan Zheng } 15715d4f98a2SYan Zheng } else { 15725d4f98a2SYan Zheng start = 0; 15735d4f98a2SYan Zheng } 15745d4f98a2SYan Zheng 157533345d01SLi Zefan if (unlikely(max_key->objectid == ino)) { 15765d4f98a2SYan Zheng if (max_key->type < BTRFS_EXTENT_DATA_KEY) 15775d4f98a2SYan Zheng continue; 15785d4f98a2SYan Zheng if (max_key->type > BTRFS_EXTENT_DATA_KEY) { 15795d4f98a2SYan Zheng end = (u64)-1; 15805d4f98a2SYan Zheng } else { 15815d4f98a2SYan Zheng if (max_key->offset == 0) 15825d4f98a2SYan Zheng continue; 15835d4f98a2SYan Zheng end = max_key->offset; 15840b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 15855d4f98a2SYan Zheng end--; 15865d4f98a2SYan Zheng } 15875d4f98a2SYan Zheng } else { 15885d4f98a2SYan Zheng end = (u64)-1; 15895d4f98a2SYan Zheng } 15905d4f98a2SYan Zheng 15915d4f98a2SYan Zheng /* the lock_extent waits for readpage to complete */ 1592d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 1593dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 1); 1594d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 15955d4f98a2SYan Zheng } 15965d4f98a2SYan Zheng return 0; 15975d4f98a2SYan Zheng } 15985d4f98a2SYan Zheng 15995d4f98a2SYan Zheng static int find_next_key(struct btrfs_path *path, int level, 16005d4f98a2SYan Zheng struct btrfs_key *key) 16015d4f98a2SYan Zheng 16025d4f98a2SYan Zheng { 16035d4f98a2SYan Zheng while (level < BTRFS_MAX_LEVEL) { 16045d4f98a2SYan Zheng if (!path->nodes[level]) 16055d4f98a2SYan Zheng break; 16065d4f98a2SYan Zheng if (path->slots[level] + 1 < 16075d4f98a2SYan Zheng btrfs_header_nritems(path->nodes[level])) { 16085d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], key, 16095d4f98a2SYan Zheng path->slots[level] + 1); 16105d4f98a2SYan Zheng return 0; 16115d4f98a2SYan Zheng } 16125d4f98a2SYan Zheng level++; 16135d4f98a2SYan Zheng } 16145d4f98a2SYan Zheng return 1; 16155d4f98a2SYan Zheng } 16165d4f98a2SYan Zheng 16175d4f98a2SYan Zheng /* 1618d2311e69SQu Wenruo * Insert current subvolume into reloc_control::dirty_subvol_roots 1619d2311e69SQu Wenruo */ 1620d2311e69SQu Wenruo static void insert_dirty_subvol(struct btrfs_trans_handle *trans, 1621d2311e69SQu Wenruo struct reloc_control *rc, 1622d2311e69SQu Wenruo struct btrfs_root *root) 1623d2311e69SQu Wenruo { 1624d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1625d2311e69SQu Wenruo struct btrfs_root_item *reloc_root_item; 1626d2311e69SQu Wenruo 1627d2311e69SQu Wenruo /* @root must be a subvolume tree root with a valid reloc tree */ 1628d2311e69SQu Wenruo ASSERT(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 1629d2311e69SQu Wenruo ASSERT(reloc_root); 1630d2311e69SQu Wenruo 1631d2311e69SQu Wenruo reloc_root_item = &reloc_root->root_item; 1632d2311e69SQu Wenruo memset(&reloc_root_item->drop_progress, 0, 1633d2311e69SQu Wenruo sizeof(reloc_root_item->drop_progress)); 1634d2311e69SQu Wenruo reloc_root_item->drop_level = 0; 1635d2311e69SQu Wenruo btrfs_set_root_refs(reloc_root_item, 0); 1636d2311e69SQu Wenruo btrfs_update_reloc_root(trans, root); 1637d2311e69SQu Wenruo 1638d2311e69SQu Wenruo if (list_empty(&root->reloc_dirty_list)) { 163900246528SJosef Bacik btrfs_grab_root(root); 1640d2311e69SQu Wenruo list_add_tail(&root->reloc_dirty_list, &rc->dirty_subvol_roots); 1641d2311e69SQu Wenruo } 1642d2311e69SQu Wenruo } 1643d2311e69SQu Wenruo 1644d2311e69SQu Wenruo static int clean_dirty_subvols(struct reloc_control *rc) 1645d2311e69SQu Wenruo { 1646d2311e69SQu Wenruo struct btrfs_root *root; 1647d2311e69SQu Wenruo struct btrfs_root *next; 1648d2311e69SQu Wenruo int ret = 0; 164930d40577SQu Wenruo int ret2; 1650d2311e69SQu Wenruo 1651d2311e69SQu Wenruo list_for_each_entry_safe(root, next, &rc->dirty_subvol_roots, 1652d2311e69SQu Wenruo reloc_dirty_list) { 165330d40577SQu Wenruo if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 165430d40577SQu Wenruo /* Merged subvolume, cleanup its reloc root */ 1655d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1656d2311e69SQu Wenruo 1657d2311e69SQu Wenruo list_del_init(&root->reloc_dirty_list); 1658d2311e69SQu Wenruo root->reloc_root = NULL; 16596282675eSQu Wenruo /* 16606282675eSQu Wenruo * Need barrier to ensure clear_bit() only happens after 16616282675eSQu Wenruo * root->reloc_root = NULL. Pairs with have_reloc_root. 16626282675eSQu Wenruo */ 16636282675eSQu Wenruo smp_wmb(); 16641fac4a54SQu Wenruo clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 1665f28de8d8SJosef Bacik if (reloc_root) { 1666f44deb74SJosef Bacik /* 1667f44deb74SJosef Bacik * btrfs_drop_snapshot drops our ref we hold for 1668f44deb74SJosef Bacik * ->reloc_root. If it fails however we must 1669f44deb74SJosef Bacik * drop the ref ourselves. 1670f44deb74SJosef Bacik */ 1671f28de8d8SJosef Bacik ret2 = btrfs_drop_snapshot(reloc_root, 0, 1); 1672f44deb74SJosef Bacik if (ret2 < 0) { 1673f44deb74SJosef Bacik btrfs_put_root(reloc_root); 1674f44deb74SJosef Bacik if (!ret) 1675f28de8d8SJosef Bacik ret = ret2; 1676f28de8d8SJosef Bacik } 1677f44deb74SJosef Bacik } 167800246528SJosef Bacik btrfs_put_root(root); 167930d40577SQu Wenruo } else { 168030d40577SQu Wenruo /* Orphan reloc tree, just clean it up */ 16810078a9f9SNikolay Borisov ret2 = btrfs_drop_snapshot(root, 0, 1); 1682f44deb74SJosef Bacik if (ret2 < 0) { 1683f44deb74SJosef Bacik btrfs_put_root(root); 1684f44deb74SJosef Bacik if (!ret) 168530d40577SQu Wenruo ret = ret2; 168630d40577SQu Wenruo } 1687d2311e69SQu Wenruo } 1688f44deb74SJosef Bacik } 1689d2311e69SQu Wenruo return ret; 1690d2311e69SQu Wenruo } 1691d2311e69SQu Wenruo 1692d2311e69SQu Wenruo /* 16935d4f98a2SYan Zheng * merge the relocated tree blocks in reloc tree with corresponding 16945d4f98a2SYan Zheng * fs tree. 16955d4f98a2SYan Zheng */ 16965d4f98a2SYan Zheng static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, 16975d4f98a2SYan Zheng struct btrfs_root *root) 16985d4f98a2SYan Zheng { 16990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 17005d4f98a2SYan Zheng struct btrfs_key key; 17015d4f98a2SYan Zheng struct btrfs_key next_key; 17029e6a0c52SJosef Bacik struct btrfs_trans_handle *trans = NULL; 17035d4f98a2SYan Zheng struct btrfs_root *reloc_root; 17045d4f98a2SYan Zheng struct btrfs_root_item *root_item; 17055d4f98a2SYan Zheng struct btrfs_path *path; 17063fd0a558SYan, Zheng struct extent_buffer *leaf; 17075d4f98a2SYan Zheng int level; 17085d4f98a2SYan Zheng int max_level; 17095d4f98a2SYan Zheng int replaced = 0; 17105d4f98a2SYan Zheng int ret; 17115d4f98a2SYan Zheng int err = 0; 17123fd0a558SYan, Zheng u32 min_reserved; 17135d4f98a2SYan Zheng 17145d4f98a2SYan Zheng path = btrfs_alloc_path(); 17155d4f98a2SYan Zheng if (!path) 17165d4f98a2SYan Zheng return -ENOMEM; 1717e4058b54SDavid Sterba path->reada = READA_FORWARD; 17185d4f98a2SYan Zheng 17195d4f98a2SYan Zheng reloc_root = root->reloc_root; 17205d4f98a2SYan Zheng root_item = &reloc_root->root_item; 17215d4f98a2SYan Zheng 17225d4f98a2SYan Zheng if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { 17235d4f98a2SYan Zheng level = btrfs_root_level(root_item); 172467439dadSDavid Sterba atomic_inc(&reloc_root->node->refs); 17255d4f98a2SYan Zheng path->nodes[level] = reloc_root->node; 17265d4f98a2SYan Zheng path->slots[level] = 0; 17275d4f98a2SYan Zheng } else { 17285d4f98a2SYan Zheng btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); 17295d4f98a2SYan Zheng 17305d4f98a2SYan Zheng level = root_item->drop_level; 17315d4f98a2SYan Zheng BUG_ON(level == 0); 17325d4f98a2SYan Zheng path->lowest_level = level; 17335d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); 173433c66f43SYan Zheng path->lowest_level = 0; 17355d4f98a2SYan Zheng if (ret < 0) { 17365d4f98a2SYan Zheng btrfs_free_path(path); 17375d4f98a2SYan Zheng return ret; 17385d4f98a2SYan Zheng } 17395d4f98a2SYan Zheng 17405d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &next_key, 17415d4f98a2SYan Zheng path->slots[level]); 17425d4f98a2SYan Zheng WARN_ON(memcmp(&key, &next_key, sizeof(key))); 17435d4f98a2SYan Zheng 17445d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 17455d4f98a2SYan Zheng } 17465d4f98a2SYan Zheng 17470b246afaSJeff Mahoney min_reserved = fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 17485d4f98a2SYan Zheng memset(&next_key, 0, sizeof(next_key)); 17495d4f98a2SYan Zheng 17505d4f98a2SYan Zheng while (1) { 175108e007d2SMiao Xie ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, 175208e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 17533fd0a558SYan, Zheng if (ret) { 17549e6a0c52SJosef Bacik err = ret; 17559e6a0c52SJosef Bacik goto out; 17563fd0a558SYan, Zheng } 17579e6a0c52SJosef Bacik trans = btrfs_start_transaction(root, 0); 17589e6a0c52SJosef Bacik if (IS_ERR(trans)) { 17599e6a0c52SJosef Bacik err = PTR_ERR(trans); 17609e6a0c52SJosef Bacik trans = NULL; 17619e6a0c52SJosef Bacik goto out; 17629e6a0c52SJosef Bacik } 17632abc726aSJosef Bacik 17642abc726aSJosef Bacik /* 17652abc726aSJosef Bacik * At this point we no longer have a reloc_control, so we can't 17662abc726aSJosef Bacik * depend on btrfs_init_reloc_root to update our last_trans. 17672abc726aSJosef Bacik * 17682abc726aSJosef Bacik * But that's ok, we started the trans handle on our 17692abc726aSJosef Bacik * corresponding fs_root, which means it's been added to the 17702abc726aSJosef Bacik * dirty list. At commit time we'll still call 17712abc726aSJosef Bacik * btrfs_update_reloc_root() and update our root item 17722abc726aSJosef Bacik * appropriately. 17732abc726aSJosef Bacik */ 17742abc726aSJosef Bacik reloc_root->last_trans = trans->transid; 17759e6a0c52SJosef Bacik trans->block_rsv = rc->block_rsv; 17763fd0a558SYan, Zheng 17773fd0a558SYan, Zheng replaced = 0; 17785d4f98a2SYan Zheng max_level = level; 17795d4f98a2SYan Zheng 17805d4f98a2SYan Zheng ret = walk_down_reloc_tree(reloc_root, path, &level); 17815d4f98a2SYan Zheng if (ret < 0) { 17825d4f98a2SYan Zheng err = ret; 17835d4f98a2SYan Zheng goto out; 17845d4f98a2SYan Zheng } 17855d4f98a2SYan Zheng if (ret > 0) 17865d4f98a2SYan Zheng break; 17875d4f98a2SYan Zheng 17885d4f98a2SYan Zheng if (!find_next_key(path, level, &key) && 17895d4f98a2SYan Zheng btrfs_comp_cpu_keys(&next_key, &key) >= 0) { 17905d4f98a2SYan Zheng ret = 0; 17915d4f98a2SYan Zheng } else { 17923d0174f7SQu Wenruo ret = replace_path(trans, rc, root, reloc_root, path, 17933fd0a558SYan, Zheng &next_key, level, max_level); 17945d4f98a2SYan Zheng } 17955d4f98a2SYan Zheng if (ret < 0) { 17965d4f98a2SYan Zheng err = ret; 17975d4f98a2SYan Zheng goto out; 17985d4f98a2SYan Zheng } 17995d4f98a2SYan Zheng 18005d4f98a2SYan Zheng if (ret > 0) { 18015d4f98a2SYan Zheng level = ret; 18025d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 18035d4f98a2SYan Zheng path->slots[level]); 18045d4f98a2SYan Zheng replaced = 1; 18055d4f98a2SYan Zheng } 18065d4f98a2SYan Zheng 18075d4f98a2SYan Zheng ret = walk_up_reloc_tree(reloc_root, path, &level); 18085d4f98a2SYan Zheng if (ret > 0) 18095d4f98a2SYan Zheng break; 18105d4f98a2SYan Zheng 18115d4f98a2SYan Zheng BUG_ON(level == 0); 18125d4f98a2SYan Zheng /* 18135d4f98a2SYan Zheng * save the merging progress in the drop_progress. 18145d4f98a2SYan Zheng * this is OK since root refs == 1 in this case. 18155d4f98a2SYan Zheng */ 18165d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &root_item->drop_progress, 18175d4f98a2SYan Zheng path->slots[level]); 18185d4f98a2SYan Zheng root_item->drop_level = level; 18195d4f98a2SYan Zheng 18203a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 18219e6a0c52SJosef Bacik trans = NULL; 18225d4f98a2SYan Zheng 18232ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 18245d4f98a2SYan Zheng 18255d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 18265d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 18275d4f98a2SYan Zheng } 18285d4f98a2SYan Zheng 18295d4f98a2SYan Zheng /* 18305d4f98a2SYan Zheng * handle the case only one block in the fs tree need to be 18315d4f98a2SYan Zheng * relocated and the block is tree root. 18325d4f98a2SYan Zheng */ 18335d4f98a2SYan Zheng leaf = btrfs_lock_root_node(root); 18345d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); 18355d4f98a2SYan Zheng btrfs_tree_unlock(leaf); 18365d4f98a2SYan Zheng free_extent_buffer(leaf); 18375d4f98a2SYan Zheng if (ret < 0) 18385d4f98a2SYan Zheng err = ret; 18395d4f98a2SYan Zheng out: 18405d4f98a2SYan Zheng btrfs_free_path(path); 18415d4f98a2SYan Zheng 1842d2311e69SQu Wenruo if (err == 0) 1843d2311e69SQu Wenruo insert_dirty_subvol(trans, rc, root); 18445d4f98a2SYan Zheng 18459e6a0c52SJosef Bacik if (trans) 18463a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 18475d4f98a2SYan Zheng 18482ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 18495d4f98a2SYan Zheng 18505d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 18515d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 18525d4f98a2SYan Zheng 18535d4f98a2SYan Zheng return err; 18545d4f98a2SYan Zheng } 18555d4f98a2SYan Zheng 18563fd0a558SYan, Zheng static noinline_for_stack 18573fd0a558SYan, Zheng int prepare_to_merge(struct reloc_control *rc, int err) 18585d4f98a2SYan Zheng { 18593fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 18600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 18613fd0a558SYan, Zheng struct btrfs_root *reloc_root; 18625d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 18633fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 18643fd0a558SYan, Zheng u64 num_bytes = 0; 18653fd0a558SYan, Zheng int ret; 18663fd0a558SYan, Zheng 18670b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 18680b246afaSJeff Mahoney rc->merging_rsv_size += fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 18693fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated * 2; 18700b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 18717585717fSChris Mason 18723fd0a558SYan, Zheng again: 18733fd0a558SYan, Zheng if (!err) { 18743fd0a558SYan, Zheng num_bytes = rc->merging_rsv_size; 187508e007d2SMiao Xie ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, 187608e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 18773fd0a558SYan, Zheng if (ret) 18783fd0a558SYan, Zheng err = ret; 18793fd0a558SYan, Zheng } 18803fd0a558SYan, Zheng 18817a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 18823612b495STsutomu Itoh if (IS_ERR(trans)) { 18833612b495STsutomu Itoh if (!err) 18842ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 188563f018beSNikolay Borisov num_bytes, NULL); 18863612b495STsutomu Itoh return PTR_ERR(trans); 18873612b495STsutomu Itoh } 18883fd0a558SYan, Zheng 18893fd0a558SYan, Zheng if (!err) { 18903fd0a558SYan, Zheng if (num_bytes != rc->merging_rsv_size) { 18913a45bb20SJeff Mahoney btrfs_end_transaction(trans); 18922ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 189363f018beSNikolay Borisov num_bytes, NULL); 18943fd0a558SYan, Zheng goto again; 18953fd0a558SYan, Zheng } 18963fd0a558SYan, Zheng } 18973fd0a558SYan, Zheng 18983fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 18993fd0a558SYan, Zheng 19003fd0a558SYan, Zheng while (!list_empty(&rc->reloc_roots)) { 19013fd0a558SYan, Zheng reloc_root = list_entry(rc->reloc_roots.next, 19023fd0a558SYan, Zheng struct btrfs_root, root_list); 19033fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 19043fd0a558SYan, Zheng 19050b246afaSJeff Mahoney root = read_fs_root(fs_info, reloc_root->root_key.offset); 19063fd0a558SYan, Zheng BUG_ON(IS_ERR(root)); 19073fd0a558SYan, Zheng BUG_ON(root->reloc_root != reloc_root); 19083fd0a558SYan, Zheng 19093fd0a558SYan, Zheng /* 19103fd0a558SYan, Zheng * set reference count to 1, so btrfs_recover_relocation 19113fd0a558SYan, Zheng * knows it should resumes merging 19123fd0a558SYan, Zheng */ 19133fd0a558SYan, Zheng if (!err) 19143fd0a558SYan, Zheng btrfs_set_root_refs(&reloc_root->root_item, 1); 19153fd0a558SYan, Zheng btrfs_update_reloc_root(trans, root); 19163fd0a558SYan, Zheng 19173fd0a558SYan, Zheng list_add(&reloc_root->root_list, &reloc_roots); 191800246528SJosef Bacik btrfs_put_root(root); 19193fd0a558SYan, Zheng } 19203fd0a558SYan, Zheng 19213fd0a558SYan, Zheng list_splice(&reloc_roots, &rc->reloc_roots); 19223fd0a558SYan, Zheng 19233fd0a558SYan, Zheng if (!err) 19243a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 19253fd0a558SYan, Zheng else 19263a45bb20SJeff Mahoney btrfs_end_transaction(trans); 19273fd0a558SYan, Zheng return err; 19283fd0a558SYan, Zheng } 19293fd0a558SYan, Zheng 19303fd0a558SYan, Zheng static noinline_for_stack 1931aca1bba6SLiu Bo void free_reloc_roots(struct list_head *list) 1932aca1bba6SLiu Bo { 1933aca1bba6SLiu Bo struct btrfs_root *reloc_root; 1934aca1bba6SLiu Bo 1935aca1bba6SLiu Bo while (!list_empty(list)) { 1936aca1bba6SLiu Bo reloc_root = list_entry(list->next, struct btrfs_root, 1937aca1bba6SLiu Bo root_list); 1938bb166d72SNaohiro Aota __del_reloc_root(reloc_root); 1939aca1bba6SLiu Bo } 1940aca1bba6SLiu Bo } 1941aca1bba6SLiu Bo 1942aca1bba6SLiu Bo static noinline_for_stack 194394404e82SDavid Sterba void merge_reloc_roots(struct reloc_control *rc) 19443fd0a558SYan, Zheng { 19450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 19465d4f98a2SYan Zheng struct btrfs_root *root; 19475d4f98a2SYan Zheng struct btrfs_root *reloc_root; 19483fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 19493fd0a558SYan, Zheng int found = 0; 1950aca1bba6SLiu Bo int ret = 0; 19513fd0a558SYan, Zheng again: 19523fd0a558SYan, Zheng root = rc->extent_root; 19537585717fSChris Mason 19547585717fSChris Mason /* 19557585717fSChris Mason * this serializes us with btrfs_record_root_in_transaction, 19567585717fSChris Mason * we have to make sure nobody is in the middle of 19577585717fSChris Mason * adding their roots to the list while we are 19587585717fSChris Mason * doing this splice 19597585717fSChris Mason */ 19600b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 19613fd0a558SYan, Zheng list_splice_init(&rc->reloc_roots, &reloc_roots); 19620b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 19635d4f98a2SYan Zheng 19643fd0a558SYan, Zheng while (!list_empty(&reloc_roots)) { 19653fd0a558SYan, Zheng found = 1; 19663fd0a558SYan, Zheng reloc_root = list_entry(reloc_roots.next, 19673fd0a558SYan, Zheng struct btrfs_root, root_list); 19685d4f98a2SYan Zheng 19695d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 19700b246afaSJeff Mahoney root = read_fs_root(fs_info, 19715d4f98a2SYan Zheng reloc_root->root_key.offset); 19725d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 19735d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 19745d4f98a2SYan Zheng 19753fd0a558SYan, Zheng ret = merge_reloc_root(rc, root); 197600246528SJosef Bacik btrfs_put_root(root); 1977b37b39cdSJosef Bacik if (ret) { 197825e293c2SWang Shilong if (list_empty(&reloc_root->root_list)) 197925e293c2SWang Shilong list_add_tail(&reloc_root->root_list, 198025e293c2SWang Shilong &reloc_roots); 1981aca1bba6SLiu Bo goto out; 1982b37b39cdSJosef Bacik } 19833fd0a558SYan, Zheng } else { 19843fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 198530d40577SQu Wenruo /* Don't forget to queue this reloc root for cleanup */ 198630d40577SQu Wenruo list_add_tail(&reloc_root->reloc_dirty_list, 198730d40577SQu Wenruo &rc->dirty_subvol_roots); 19883fd0a558SYan, Zheng } 19895d4f98a2SYan Zheng } 19905d4f98a2SYan Zheng 19913fd0a558SYan, Zheng if (found) { 19923fd0a558SYan, Zheng found = 0; 19933fd0a558SYan, Zheng goto again; 19945d4f98a2SYan Zheng } 1995aca1bba6SLiu Bo out: 1996aca1bba6SLiu Bo if (ret) { 19970b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, ret, NULL); 1998aca1bba6SLiu Bo if (!list_empty(&reloc_roots)) 1999aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 2000467bb1d2SWang Shilong 2001467bb1d2SWang Shilong /* new reloc root may be added */ 20020b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 2003467bb1d2SWang Shilong list_splice_init(&rc->reloc_roots, &reloc_roots); 20040b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 2005467bb1d2SWang Shilong if (!list_empty(&reloc_roots)) 2006467bb1d2SWang Shilong free_reloc_roots(&reloc_roots); 2007aca1bba6SLiu Bo } 2008aca1bba6SLiu Bo 20097b7b7431SJosef Bacik /* 20107b7b7431SJosef Bacik * We used to have 20117b7b7431SJosef Bacik * 20127b7b7431SJosef Bacik * BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); 20137b7b7431SJosef Bacik * 20147b7b7431SJosef Bacik * here, but it's wrong. If we fail to start the transaction in 20157b7b7431SJosef Bacik * prepare_to_merge() we will have only 0 ref reloc roots, none of which 20167b7b7431SJosef Bacik * have actually been removed from the reloc_root_tree rb tree. This is 20177b7b7431SJosef Bacik * fine because we're bailing here, and we hold a reference on the root 20187b7b7431SJosef Bacik * for the list that holds it, so these roots will be cleaned up when we 20197b7b7431SJosef Bacik * do the reloc_dirty_list afterwards. Meanwhile the root->reloc_root 20207b7b7431SJosef Bacik * will be cleaned up on unmount. 20217b7b7431SJosef Bacik * 20227b7b7431SJosef Bacik * The remaining nodes will be cleaned up by free_reloc_control. 20237b7b7431SJosef Bacik */ 20245d4f98a2SYan Zheng } 20255d4f98a2SYan Zheng 20265d4f98a2SYan Zheng static void free_block_list(struct rb_root *blocks) 20275d4f98a2SYan Zheng { 20285d4f98a2SYan Zheng struct tree_block *block; 20295d4f98a2SYan Zheng struct rb_node *rb_node; 20305d4f98a2SYan Zheng while ((rb_node = rb_first(blocks))) { 20315d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 20325d4f98a2SYan Zheng rb_erase(rb_node, blocks); 20335d4f98a2SYan Zheng kfree(block); 20345d4f98a2SYan Zheng } 20355d4f98a2SYan Zheng } 20365d4f98a2SYan Zheng 20375d4f98a2SYan Zheng static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, 20385d4f98a2SYan Zheng struct btrfs_root *reloc_root) 20395d4f98a2SYan Zheng { 20400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = reloc_root->fs_info; 20415d4f98a2SYan Zheng struct btrfs_root *root; 2042442b1ac5SJosef Bacik int ret; 20435d4f98a2SYan Zheng 20445d4f98a2SYan Zheng if (reloc_root->last_trans == trans->transid) 20455d4f98a2SYan Zheng return 0; 20465d4f98a2SYan Zheng 20470b246afaSJeff Mahoney root = read_fs_root(fs_info, reloc_root->root_key.offset); 20485d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 20495d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 2050442b1ac5SJosef Bacik ret = btrfs_record_root_in_trans(trans, root); 205100246528SJosef Bacik btrfs_put_root(root); 20525d4f98a2SYan Zheng 2053442b1ac5SJosef Bacik return ret; 20545d4f98a2SYan Zheng } 20555d4f98a2SYan Zheng 20563fd0a558SYan, Zheng static noinline_for_stack 20573fd0a558SYan, Zheng struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, 20583fd0a558SYan, Zheng struct reloc_control *rc, 2059a26195a5SQu Wenruo struct btrfs_backref_node *node, 2060a26195a5SQu Wenruo struct btrfs_backref_edge *edges[]) 20615d4f98a2SYan Zheng { 2062a26195a5SQu Wenruo struct btrfs_backref_node *next; 20635d4f98a2SYan Zheng struct btrfs_root *root; 20643fd0a558SYan, Zheng int index = 0; 20653fd0a558SYan, Zheng 20665d4f98a2SYan Zheng next = node; 20675d4f98a2SYan Zheng while (1) { 20685d4f98a2SYan Zheng cond_resched(); 20695d4f98a2SYan Zheng next = walk_up_backref(next, edges, &index); 20705d4f98a2SYan Zheng root = next->root; 20713fd0a558SYan, Zheng BUG_ON(!root); 207227cdeb70SMiao Xie BUG_ON(!test_bit(BTRFS_ROOT_REF_COWS, &root->state)); 20735d4f98a2SYan Zheng 20745d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { 20755d4f98a2SYan Zheng record_reloc_root_in_trans(trans, root); 20765d4f98a2SYan Zheng break; 20775d4f98a2SYan Zheng } 20785d4f98a2SYan Zheng 20795d4f98a2SYan Zheng btrfs_record_root_in_trans(trans, root); 20803fd0a558SYan, Zheng root = root->reloc_root; 20813fd0a558SYan, Zheng 20823fd0a558SYan, Zheng if (next->new_bytenr != root->node->start) { 20833fd0a558SYan, Zheng BUG_ON(next->new_bytenr); 20843fd0a558SYan, Zheng BUG_ON(!list_empty(&next->list)); 20853fd0a558SYan, Zheng next->new_bytenr = root->node->start; 208600246528SJosef Bacik btrfs_put_root(next->root); 208700246528SJosef Bacik next->root = btrfs_grab_root(root); 20880b530bc5SJosef Bacik ASSERT(next->root); 20893fd0a558SYan, Zheng list_add_tail(&next->list, 20903fd0a558SYan, Zheng &rc->backref_cache.changed); 20919569cc20SQu Wenruo mark_block_processed(rc, next); 20925d4f98a2SYan Zheng break; 20935d4f98a2SYan Zheng } 20945d4f98a2SYan Zheng 20953fd0a558SYan, Zheng WARN_ON(1); 20965d4f98a2SYan Zheng root = NULL; 20975d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 20985d4f98a2SYan Zheng if (!next || next->level <= node->level) 20995d4f98a2SYan Zheng break; 21005d4f98a2SYan Zheng } 21013fd0a558SYan, Zheng if (!root) 21023fd0a558SYan, Zheng return NULL; 21035d4f98a2SYan Zheng 21043fd0a558SYan, Zheng next = node; 21053fd0a558SYan, Zheng /* setup backref node path for btrfs_reloc_cow_block */ 21063fd0a558SYan, Zheng while (1) { 21073fd0a558SYan, Zheng rc->backref_cache.path[next->level] = next; 21083fd0a558SYan, Zheng if (--index < 0) 21093fd0a558SYan, Zheng break; 21103fd0a558SYan, Zheng next = edges[index]->node[UPPER]; 21113fd0a558SYan, Zheng } 21125d4f98a2SYan Zheng return root; 21135d4f98a2SYan Zheng } 21145d4f98a2SYan Zheng 21153fd0a558SYan, Zheng /* 21163fd0a558SYan, Zheng * select a tree root for relocation. return NULL if the block 21173fd0a558SYan, Zheng * is reference counted. we should use do_relocation() in this 21183fd0a558SYan, Zheng * case. return a tree root pointer if the block isn't reference 21193fd0a558SYan, Zheng * counted. return -ENOENT if the block is root of reloc tree. 21203fd0a558SYan, Zheng */ 21215d4f98a2SYan Zheng static noinline_for_stack 2122a26195a5SQu Wenruo struct btrfs_root *select_one_root(struct btrfs_backref_node *node) 21235d4f98a2SYan Zheng { 2124a26195a5SQu Wenruo struct btrfs_backref_node *next; 21253fd0a558SYan, Zheng struct btrfs_root *root; 21263fd0a558SYan, Zheng struct btrfs_root *fs_root = NULL; 2127a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 21283fd0a558SYan, Zheng int index = 0; 21293fd0a558SYan, Zheng 21303fd0a558SYan, Zheng next = node; 21313fd0a558SYan, Zheng while (1) { 21323fd0a558SYan, Zheng cond_resched(); 21333fd0a558SYan, Zheng next = walk_up_backref(next, edges, &index); 21343fd0a558SYan, Zheng root = next->root; 21353fd0a558SYan, Zheng BUG_ON(!root); 21363fd0a558SYan, Zheng 213725985edcSLucas De Marchi /* no other choice for non-references counted tree */ 213827cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 21393fd0a558SYan, Zheng return root; 21403fd0a558SYan, Zheng 21413fd0a558SYan, Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) 21423fd0a558SYan, Zheng fs_root = root; 21433fd0a558SYan, Zheng 21443fd0a558SYan, Zheng if (next != node) 21453fd0a558SYan, Zheng return NULL; 21463fd0a558SYan, Zheng 21473fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 21483fd0a558SYan, Zheng if (!next || next->level <= node->level) 21493fd0a558SYan, Zheng break; 21503fd0a558SYan, Zheng } 21513fd0a558SYan, Zheng 21523fd0a558SYan, Zheng if (!fs_root) 21533fd0a558SYan, Zheng return ERR_PTR(-ENOENT); 21543fd0a558SYan, Zheng return fs_root; 21555d4f98a2SYan Zheng } 21565d4f98a2SYan Zheng 21575d4f98a2SYan Zheng static noinline_for_stack 21583fd0a558SYan, Zheng u64 calcu_metadata_size(struct reloc_control *rc, 2159a26195a5SQu Wenruo struct btrfs_backref_node *node, int reserve) 21605d4f98a2SYan Zheng { 21610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2162a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2163a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2164a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 21653fd0a558SYan, Zheng u64 num_bytes = 0; 21663fd0a558SYan, Zheng int index = 0; 21675d4f98a2SYan Zheng 21683fd0a558SYan, Zheng BUG_ON(reserve && node->processed); 21693fd0a558SYan, Zheng 21703fd0a558SYan, Zheng while (next) { 21713fd0a558SYan, Zheng cond_resched(); 21725d4f98a2SYan Zheng while (1) { 21733fd0a558SYan, Zheng if (next->processed && (reserve || next != node)) 21745d4f98a2SYan Zheng break; 21755d4f98a2SYan Zheng 21760b246afaSJeff Mahoney num_bytes += fs_info->nodesize; 21773fd0a558SYan, Zheng 21783fd0a558SYan, Zheng if (list_empty(&next->upper)) 21793fd0a558SYan, Zheng break; 21803fd0a558SYan, Zheng 21813fd0a558SYan, Zheng edge = list_entry(next->upper.next, 2182a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 21833fd0a558SYan, Zheng edges[index++] = edge; 21843fd0a558SYan, Zheng next = edge->node[UPPER]; 21855d4f98a2SYan Zheng } 21863fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 21873fd0a558SYan, Zheng } 21883fd0a558SYan, Zheng return num_bytes; 21893fd0a558SYan, Zheng } 21903fd0a558SYan, Zheng 21913fd0a558SYan, Zheng static int reserve_metadata_space(struct btrfs_trans_handle *trans, 21923fd0a558SYan, Zheng struct reloc_control *rc, 2193a26195a5SQu Wenruo struct btrfs_backref_node *node) 21943fd0a558SYan, Zheng { 21953fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 2196da17066cSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 21973fd0a558SYan, Zheng u64 num_bytes; 21983fd0a558SYan, Zheng int ret; 21990647bf56SWang Shilong u64 tmp; 22003fd0a558SYan, Zheng 22013fd0a558SYan, Zheng num_bytes = calcu_metadata_size(rc, node, 1) * 2; 22023fd0a558SYan, Zheng 22033fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 22040647bf56SWang Shilong rc->reserved_bytes += num_bytes; 22058ca17f0fSJosef Bacik 22068ca17f0fSJosef Bacik /* 22078ca17f0fSJosef Bacik * We are under a transaction here so we can only do limited flushing. 22088ca17f0fSJosef Bacik * If we get an enospc just kick back -EAGAIN so we know to drop the 22098ca17f0fSJosef Bacik * transaction and try to refill when we can flush all the things. 22108ca17f0fSJosef Bacik */ 22110647bf56SWang Shilong ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes, 22128ca17f0fSJosef Bacik BTRFS_RESERVE_FLUSH_LIMIT); 22133fd0a558SYan, Zheng if (ret) { 2214da17066cSJeff Mahoney tmp = fs_info->nodesize * RELOCATION_RESERVED_NODES; 22150647bf56SWang Shilong while (tmp <= rc->reserved_bytes) 22160647bf56SWang Shilong tmp <<= 1; 22170647bf56SWang Shilong /* 22180647bf56SWang Shilong * only one thread can access block_rsv at this point, 22190647bf56SWang Shilong * so we don't need hold lock to protect block_rsv. 22200647bf56SWang Shilong * we expand more reservation size here to allow enough 222152042d8eSAndrea Gelmini * space for relocation and we will return earlier in 22220647bf56SWang Shilong * enospc case. 22230647bf56SWang Shilong */ 2224da17066cSJeff Mahoney rc->block_rsv->size = tmp + fs_info->nodesize * 22250647bf56SWang Shilong RELOCATION_RESERVED_NODES; 22268ca17f0fSJosef Bacik return -EAGAIN; 22273fd0a558SYan, Zheng } 22283fd0a558SYan, Zheng 22293fd0a558SYan, Zheng return 0; 22303fd0a558SYan, Zheng } 22313fd0a558SYan, Zheng 22325d4f98a2SYan Zheng /* 22335d4f98a2SYan Zheng * relocate a block tree, and then update pointers in upper level 22345d4f98a2SYan Zheng * blocks that reference the block to point to the new location. 22355d4f98a2SYan Zheng * 22365d4f98a2SYan Zheng * if called by link_to_upper, the block has already been relocated. 22375d4f98a2SYan Zheng * in that case this function just updates pointers. 22385d4f98a2SYan Zheng */ 22395d4f98a2SYan Zheng static int do_relocation(struct btrfs_trans_handle *trans, 22403fd0a558SYan, Zheng struct reloc_control *rc, 2241a26195a5SQu Wenruo struct btrfs_backref_node *node, 22425d4f98a2SYan Zheng struct btrfs_key *key, 22435d4f98a2SYan Zheng struct btrfs_path *path, int lowest) 22445d4f98a2SYan Zheng { 22452ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2246a26195a5SQu Wenruo struct btrfs_backref_node *upper; 2247a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2248a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 22495d4f98a2SYan Zheng struct btrfs_root *root; 22505d4f98a2SYan Zheng struct extent_buffer *eb; 22515d4f98a2SYan Zheng u32 blocksize; 22525d4f98a2SYan Zheng u64 bytenr; 22535d4f98a2SYan Zheng u64 generation; 22545d4f98a2SYan Zheng int slot; 22555d4f98a2SYan Zheng int ret; 22565d4f98a2SYan Zheng int err = 0; 22575d4f98a2SYan Zheng 22585d4f98a2SYan Zheng BUG_ON(lowest && node->eb); 22595d4f98a2SYan Zheng 22605d4f98a2SYan Zheng path->lowest_level = node->level + 1; 22613fd0a558SYan, Zheng rc->backref_cache.path[node->level] = node; 22625d4f98a2SYan Zheng list_for_each_entry(edge, &node->upper, list[LOWER]) { 2263581c1760SQu Wenruo struct btrfs_key first_key; 226482fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 2265581c1760SQu Wenruo 22665d4f98a2SYan Zheng cond_resched(); 22675d4f98a2SYan Zheng 22685d4f98a2SYan Zheng upper = edge->node[UPPER]; 2269dc4103f9SWang Shilong root = select_reloc_root(trans, rc, upper, edges); 22703fd0a558SYan, Zheng BUG_ON(!root); 22715d4f98a2SYan Zheng 22723fd0a558SYan, Zheng if (upper->eb && !upper->locked) { 22733fd0a558SYan, Zheng if (!lowest) { 22743fd0a558SYan, Zheng ret = btrfs_bin_search(upper->eb, key, 22753fd0a558SYan, Zheng upper->level, &slot); 2276cbca7d59SFilipe Manana if (ret < 0) { 2277cbca7d59SFilipe Manana err = ret; 2278cbca7d59SFilipe Manana goto next; 2279cbca7d59SFilipe Manana } 22803fd0a558SYan, Zheng BUG_ON(ret); 22813fd0a558SYan, Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 22823fd0a558SYan, Zheng if (node->eb->start == bytenr) 22833fd0a558SYan, Zheng goto next; 22843fd0a558SYan, Zheng } 2285b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 22863fd0a558SYan, Zheng } 22875d4f98a2SYan Zheng 22885d4f98a2SYan Zheng if (!upper->eb) { 22895d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 22903561b9dbSLiu Bo if (ret) { 22913561b9dbSLiu Bo if (ret < 0) 22925d4f98a2SYan Zheng err = ret; 22933561b9dbSLiu Bo else 22943561b9dbSLiu Bo err = -ENOENT; 22953561b9dbSLiu Bo 22963561b9dbSLiu Bo btrfs_release_path(path); 22975d4f98a2SYan Zheng break; 22985d4f98a2SYan Zheng } 22995d4f98a2SYan Zheng 23003fd0a558SYan, Zheng if (!upper->eb) { 23013fd0a558SYan, Zheng upper->eb = path->nodes[upper->level]; 23023fd0a558SYan, Zheng path->nodes[upper->level] = NULL; 23033fd0a558SYan, Zheng } else { 23043fd0a558SYan, Zheng BUG_ON(upper->eb != path->nodes[upper->level]); 23053fd0a558SYan, Zheng } 23063fd0a558SYan, Zheng 23073fd0a558SYan, Zheng upper->locked = 1; 23083fd0a558SYan, Zheng path->locks[upper->level] = 0; 23093fd0a558SYan, Zheng 23105d4f98a2SYan Zheng slot = path->slots[upper->level]; 2311b3b4aa74SDavid Sterba btrfs_release_path(path); 23125d4f98a2SYan Zheng } else { 23135d4f98a2SYan Zheng ret = btrfs_bin_search(upper->eb, key, upper->level, 23145d4f98a2SYan Zheng &slot); 2315cbca7d59SFilipe Manana if (ret < 0) { 2316cbca7d59SFilipe Manana err = ret; 2317cbca7d59SFilipe Manana goto next; 2318cbca7d59SFilipe Manana } 23195d4f98a2SYan Zheng BUG_ON(ret); 23205d4f98a2SYan Zheng } 23215d4f98a2SYan Zheng 23225d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 23233fd0a558SYan, Zheng if (lowest) { 23244547f4d8SLiu Bo if (bytenr != node->bytenr) { 23254547f4d8SLiu Bo btrfs_err(root->fs_info, 23264547f4d8SLiu Bo "lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu", 23274547f4d8SLiu Bo bytenr, node->bytenr, slot, 23284547f4d8SLiu Bo upper->eb->start); 23294547f4d8SLiu Bo err = -EIO; 23304547f4d8SLiu Bo goto next; 23314547f4d8SLiu Bo } 23325d4f98a2SYan Zheng } else { 23333fd0a558SYan, Zheng if (node->eb->start == bytenr) 23343fd0a558SYan, Zheng goto next; 23355d4f98a2SYan Zheng } 23365d4f98a2SYan Zheng 2337da17066cSJeff Mahoney blocksize = root->fs_info->nodesize; 23385d4f98a2SYan Zheng generation = btrfs_node_ptr_generation(upper->eb, slot); 2339581c1760SQu Wenruo btrfs_node_key_to_cpu(upper->eb, &first_key, slot); 2340581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, generation, 2341581c1760SQu Wenruo upper->level - 1, &first_key); 234264c043deSLiu Bo if (IS_ERR(eb)) { 234364c043deSLiu Bo err = PTR_ERR(eb); 234464c043deSLiu Bo goto next; 234564c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2346416bc658SJosef Bacik free_extent_buffer(eb); 234797d9a8a4STsutomu Itoh err = -EIO; 234897d9a8a4STsutomu Itoh goto next; 234997d9a8a4STsutomu Itoh } 23505d4f98a2SYan Zheng btrfs_tree_lock(eb); 23518bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 23525d4f98a2SYan Zheng 23535d4f98a2SYan Zheng if (!node->eb) { 23545d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, eb, upper->eb, 23555d4f98a2SYan Zheng slot, &eb); 23563fd0a558SYan, Zheng btrfs_tree_unlock(eb); 23573fd0a558SYan, Zheng free_extent_buffer(eb); 23585d4f98a2SYan Zheng if (ret < 0) { 23595d4f98a2SYan Zheng err = ret; 23603fd0a558SYan, Zheng goto next; 23615d4f98a2SYan Zheng } 23623fd0a558SYan, Zheng BUG_ON(node->eb != eb); 23635d4f98a2SYan Zheng } else { 23645d4f98a2SYan Zheng btrfs_set_node_blockptr(upper->eb, slot, 23655d4f98a2SYan Zheng node->eb->start); 23665d4f98a2SYan Zheng btrfs_set_node_ptr_generation(upper->eb, slot, 23675d4f98a2SYan Zheng trans->transid); 23685d4f98a2SYan Zheng btrfs_mark_buffer_dirty(upper->eb); 23695d4f98a2SYan Zheng 237082fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, 23715d4f98a2SYan Zheng node->eb->start, blocksize, 237282fa113fSQu Wenruo upper->eb->start); 237382fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 237482fa113fSQu Wenruo btrfs_init_tree_ref(&ref, node->level, 237582fa113fSQu Wenruo btrfs_header_owner(upper->eb)); 237682fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 23775d4f98a2SYan Zheng BUG_ON(ret); 23785d4f98a2SYan Zheng 23795d4f98a2SYan Zheng ret = btrfs_drop_subtree(trans, root, eb, upper->eb); 23805d4f98a2SYan Zheng BUG_ON(ret); 23815d4f98a2SYan Zheng } 23823fd0a558SYan, Zheng next: 23833fd0a558SYan, Zheng if (!upper->pending) 2384b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 23853fd0a558SYan, Zheng else 2386b0fe7078SQu Wenruo btrfs_backref_unlock_node_buffer(upper); 23873fd0a558SYan, Zheng if (err) 23883fd0a558SYan, Zheng break; 23895d4f98a2SYan Zheng } 23903fd0a558SYan, Zheng 23913fd0a558SYan, Zheng if (!err && node->pending) { 2392b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 23933fd0a558SYan, Zheng list_move_tail(&node->list, &rc->backref_cache.changed); 23943fd0a558SYan, Zheng node->pending = 0; 23955d4f98a2SYan Zheng } 23963fd0a558SYan, Zheng 23975d4f98a2SYan Zheng path->lowest_level = 0; 23983fd0a558SYan, Zheng BUG_ON(err == -ENOSPC); 23995d4f98a2SYan Zheng return err; 24005d4f98a2SYan Zheng } 24015d4f98a2SYan Zheng 24025d4f98a2SYan Zheng static int link_to_upper(struct btrfs_trans_handle *trans, 24033fd0a558SYan, Zheng struct reloc_control *rc, 2404a26195a5SQu Wenruo struct btrfs_backref_node *node, 24055d4f98a2SYan Zheng struct btrfs_path *path) 24065d4f98a2SYan Zheng { 24075d4f98a2SYan Zheng struct btrfs_key key; 24085d4f98a2SYan Zheng 24095d4f98a2SYan Zheng btrfs_node_key_to_cpu(node->eb, &key, 0); 24103fd0a558SYan, Zheng return do_relocation(trans, rc, node, &key, path, 0); 24115d4f98a2SYan Zheng } 24125d4f98a2SYan Zheng 24135d4f98a2SYan Zheng static int finish_pending_nodes(struct btrfs_trans_handle *trans, 24143fd0a558SYan, Zheng struct reloc_control *rc, 24153fd0a558SYan, Zheng struct btrfs_path *path, int err) 24165d4f98a2SYan Zheng { 24173fd0a558SYan, Zheng LIST_HEAD(list); 2418a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 2419a26195a5SQu Wenruo struct btrfs_backref_node *node; 24205d4f98a2SYan Zheng int level; 24215d4f98a2SYan Zheng int ret; 24225d4f98a2SYan Zheng 24235d4f98a2SYan Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 24245d4f98a2SYan Zheng while (!list_empty(&cache->pending[level])) { 24255d4f98a2SYan Zheng node = list_entry(cache->pending[level].next, 2426a26195a5SQu Wenruo struct btrfs_backref_node, list); 24273fd0a558SYan, Zheng list_move_tail(&node->list, &list); 24283fd0a558SYan, Zheng BUG_ON(!node->pending); 24295d4f98a2SYan Zheng 24303fd0a558SYan, Zheng if (!err) { 24313fd0a558SYan, Zheng ret = link_to_upper(trans, rc, node, path); 24325d4f98a2SYan Zheng if (ret < 0) 24335d4f98a2SYan Zheng err = ret; 24345d4f98a2SYan Zheng } 24355d4f98a2SYan Zheng } 24363fd0a558SYan, Zheng list_splice_init(&list, &cache->pending[level]); 24373fd0a558SYan, Zheng } 24385d4f98a2SYan Zheng return err; 24395d4f98a2SYan Zheng } 24405d4f98a2SYan Zheng 24415d4f98a2SYan Zheng /* 24425d4f98a2SYan Zheng * mark a block and all blocks directly/indirectly reference the block 24435d4f98a2SYan Zheng * as processed. 24445d4f98a2SYan Zheng */ 24455d4f98a2SYan Zheng static void update_processed_blocks(struct reloc_control *rc, 2446a26195a5SQu Wenruo struct btrfs_backref_node *node) 24475d4f98a2SYan Zheng { 2448a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2449a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2450a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 24515d4f98a2SYan Zheng int index = 0; 24525d4f98a2SYan Zheng 24535d4f98a2SYan Zheng while (next) { 24545d4f98a2SYan Zheng cond_resched(); 24555d4f98a2SYan Zheng while (1) { 24565d4f98a2SYan Zheng if (next->processed) 24575d4f98a2SYan Zheng break; 24585d4f98a2SYan Zheng 24599569cc20SQu Wenruo mark_block_processed(rc, next); 24605d4f98a2SYan Zheng 24615d4f98a2SYan Zheng if (list_empty(&next->upper)) 24625d4f98a2SYan Zheng break; 24635d4f98a2SYan Zheng 24645d4f98a2SYan Zheng edge = list_entry(next->upper.next, 2465a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 24665d4f98a2SYan Zheng edges[index++] = edge; 24675d4f98a2SYan Zheng next = edge->node[UPPER]; 24685d4f98a2SYan Zheng } 24695d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 24705d4f98a2SYan Zheng } 24715d4f98a2SYan Zheng } 24725d4f98a2SYan Zheng 24737476dfdaSDavid Sterba static int tree_block_processed(u64 bytenr, struct reloc_control *rc) 24745d4f98a2SYan Zheng { 2475da17066cSJeff Mahoney u32 blocksize = rc->extent_root->fs_info->nodesize; 24767476dfdaSDavid Sterba 24775d4f98a2SYan Zheng if (test_range_bit(&rc->processed_blocks, bytenr, 24789655d298SChris Mason bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) 24795d4f98a2SYan Zheng return 1; 24805d4f98a2SYan Zheng return 0; 24815d4f98a2SYan Zheng } 24825d4f98a2SYan Zheng 24832ff7e61eSJeff Mahoney static int get_tree_block_key(struct btrfs_fs_info *fs_info, 24845d4f98a2SYan Zheng struct tree_block *block) 24855d4f98a2SYan Zheng { 24865d4f98a2SYan Zheng struct extent_buffer *eb; 24875d4f98a2SYan Zheng 2488581c1760SQu Wenruo eb = read_tree_block(fs_info, block->bytenr, block->key.offset, 2489581c1760SQu Wenruo block->level, NULL); 249064c043deSLiu Bo if (IS_ERR(eb)) { 249164c043deSLiu Bo return PTR_ERR(eb); 249264c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2493416bc658SJosef Bacik free_extent_buffer(eb); 2494416bc658SJosef Bacik return -EIO; 2495416bc658SJosef Bacik } 24965d4f98a2SYan Zheng if (block->level == 0) 24975d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &block->key, 0); 24985d4f98a2SYan Zheng else 24995d4f98a2SYan Zheng btrfs_node_key_to_cpu(eb, &block->key, 0); 25005d4f98a2SYan Zheng free_extent_buffer(eb); 25015d4f98a2SYan Zheng block->key_ready = 1; 25025d4f98a2SYan Zheng return 0; 25035d4f98a2SYan Zheng } 25045d4f98a2SYan Zheng 25055d4f98a2SYan Zheng /* 25065d4f98a2SYan Zheng * helper function to relocate a tree block 25075d4f98a2SYan Zheng */ 25085d4f98a2SYan Zheng static int relocate_tree_block(struct btrfs_trans_handle *trans, 25095d4f98a2SYan Zheng struct reloc_control *rc, 2510a26195a5SQu Wenruo struct btrfs_backref_node *node, 25115d4f98a2SYan Zheng struct btrfs_key *key, 25125d4f98a2SYan Zheng struct btrfs_path *path) 25135d4f98a2SYan Zheng { 25145d4f98a2SYan Zheng struct btrfs_root *root; 25153fd0a558SYan, Zheng int ret = 0; 25165d4f98a2SYan Zheng 25173fd0a558SYan, Zheng if (!node) 25185d4f98a2SYan Zheng return 0; 25193fd0a558SYan, Zheng 25205f6b2e5cSJosef Bacik /* 25215f6b2e5cSJosef Bacik * If we fail here we want to drop our backref_node because we are going 25225f6b2e5cSJosef Bacik * to start over and regenerate the tree for it. 25235f6b2e5cSJosef Bacik */ 25245f6b2e5cSJosef Bacik ret = reserve_metadata_space(trans, rc, node); 25255f6b2e5cSJosef Bacik if (ret) 25265f6b2e5cSJosef Bacik goto out; 25275f6b2e5cSJosef Bacik 25283fd0a558SYan, Zheng BUG_ON(node->processed); 2529147d256eSZhaolei root = select_one_root(node); 25303fd0a558SYan, Zheng if (root == ERR_PTR(-ENOENT)) { 25313fd0a558SYan, Zheng update_processed_blocks(rc, node); 25323fd0a558SYan, Zheng goto out; 25335d4f98a2SYan Zheng } 25345d4f98a2SYan Zheng 25353fd0a558SYan, Zheng if (root) { 253627cdeb70SMiao Xie if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) { 25373fd0a558SYan, Zheng BUG_ON(node->new_bytenr); 25383fd0a558SYan, Zheng BUG_ON(!list_empty(&node->list)); 25393fd0a558SYan, Zheng btrfs_record_root_in_trans(trans, root); 25403fd0a558SYan, Zheng root = root->reloc_root; 25413fd0a558SYan, Zheng node->new_bytenr = root->node->start; 254200246528SJosef Bacik btrfs_put_root(node->root); 254300246528SJosef Bacik node->root = btrfs_grab_root(root); 25440b530bc5SJosef Bacik ASSERT(node->root); 25453fd0a558SYan, Zheng list_add_tail(&node->list, &rc->backref_cache.changed); 25463fd0a558SYan, Zheng } else { 25475d4f98a2SYan Zheng path->lowest_level = node->level; 25485d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 2549b3b4aa74SDavid Sterba btrfs_release_path(path); 25503fd0a558SYan, Zheng if (ret > 0) 25515d4f98a2SYan Zheng ret = 0; 25523fd0a558SYan, Zheng } 25533fd0a558SYan, Zheng if (!ret) 25543fd0a558SYan, Zheng update_processed_blocks(rc, node); 25553fd0a558SYan, Zheng } else { 25563fd0a558SYan, Zheng ret = do_relocation(trans, rc, node, key, path, 1); 25573fd0a558SYan, Zheng } 25585d4f98a2SYan Zheng out: 25590647bf56SWang Shilong if (ret || node->level == 0 || node->cowonly) 2560023acb07SQu Wenruo btrfs_backref_cleanup_node(&rc->backref_cache, node); 25615d4f98a2SYan Zheng return ret; 25625d4f98a2SYan Zheng } 25635d4f98a2SYan Zheng 25645d4f98a2SYan Zheng /* 25655d4f98a2SYan Zheng * relocate a list of blocks 25665d4f98a2SYan Zheng */ 25675d4f98a2SYan Zheng static noinline_for_stack 25685d4f98a2SYan Zheng int relocate_tree_blocks(struct btrfs_trans_handle *trans, 25695d4f98a2SYan Zheng struct reloc_control *rc, struct rb_root *blocks) 25705d4f98a2SYan Zheng { 25712ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2572a26195a5SQu Wenruo struct btrfs_backref_node *node; 25735d4f98a2SYan Zheng struct btrfs_path *path; 25745d4f98a2SYan Zheng struct tree_block *block; 257598ff7b94SQu Wenruo struct tree_block *next; 25765d4f98a2SYan Zheng int ret; 25775d4f98a2SYan Zheng int err = 0; 25785d4f98a2SYan Zheng 25795d4f98a2SYan Zheng path = btrfs_alloc_path(); 2580e1a12670SLiu Bo if (!path) { 2581e1a12670SLiu Bo err = -ENOMEM; 258234c2b290SDavid Sterba goto out_free_blocks; 2583e1a12670SLiu Bo } 25845d4f98a2SYan Zheng 258598ff7b94SQu Wenruo /* Kick in readahead for tree blocks with missing keys */ 258698ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 25875d4f98a2SYan Zheng if (!block->key_ready) 25882ff7e61eSJeff Mahoney readahead_tree_block(fs_info, block->bytenr); 25895d4f98a2SYan Zheng } 25905d4f98a2SYan Zheng 259198ff7b94SQu Wenruo /* Get first keys */ 259298ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 259334c2b290SDavid Sterba if (!block->key_ready) { 25942ff7e61eSJeff Mahoney err = get_tree_block_key(fs_info, block); 259534c2b290SDavid Sterba if (err) 259634c2b290SDavid Sterba goto out_free_path; 259734c2b290SDavid Sterba } 25985d4f98a2SYan Zheng } 25995d4f98a2SYan Zheng 260098ff7b94SQu Wenruo /* Do tree relocation */ 260198ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 26023fd0a558SYan, Zheng node = build_backref_tree(rc, &block->key, 26035d4f98a2SYan Zheng block->level, block->bytenr); 26045d4f98a2SYan Zheng if (IS_ERR(node)) { 26055d4f98a2SYan Zheng err = PTR_ERR(node); 26065d4f98a2SYan Zheng goto out; 26075d4f98a2SYan Zheng } 26085d4f98a2SYan Zheng 26095d4f98a2SYan Zheng ret = relocate_tree_block(trans, rc, node, &block->key, 26105d4f98a2SYan Zheng path); 26115d4f98a2SYan Zheng if (ret < 0) { 26125d4f98a2SYan Zheng err = ret; 261350dbbb71SJosef Bacik break; 26145d4f98a2SYan Zheng } 26155d4f98a2SYan Zheng } 26165d4f98a2SYan Zheng out: 26173fd0a558SYan, Zheng err = finish_pending_nodes(trans, rc, path, err); 26185d4f98a2SYan Zheng 261934c2b290SDavid Sterba out_free_path: 26205d4f98a2SYan Zheng btrfs_free_path(path); 262134c2b290SDavid Sterba out_free_blocks: 2622e1a12670SLiu Bo free_block_list(blocks); 26235d4f98a2SYan Zheng return err; 26245d4f98a2SYan Zheng } 26255d4f98a2SYan Zheng 26265d4f98a2SYan Zheng static noinline_for_stack 2627efa56464SYan, Zheng int prealloc_file_extent_cluster(struct inode *inode, 2628efa56464SYan, Zheng struct file_extent_cluster *cluster) 2629efa56464SYan, Zheng { 2630efa56464SYan, Zheng u64 alloc_hint = 0; 2631efa56464SYan, Zheng u64 start; 2632efa56464SYan, Zheng u64 end; 2633efa56464SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 2634efa56464SYan, Zheng u64 num_bytes; 2635efa56464SYan, Zheng int nr = 0; 2636efa56464SYan, Zheng int ret = 0; 2637dcb40c19SWang Xiaoguang u64 prealloc_start = cluster->start - offset; 2638dcb40c19SWang Xiaoguang u64 prealloc_end = cluster->end - offset; 263918513091SWang Xiaoguang u64 cur_offset; 2640364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 2641efa56464SYan, Zheng 2642efa56464SYan, Zheng BUG_ON(cluster->start != cluster->boundary[0]); 26435955102cSAl Viro inode_lock(inode); 2644efa56464SYan, Zheng 2645364ecf36SQu Wenruo ret = btrfs_check_data_free_space(inode, &data_reserved, prealloc_start, 2646dcb40c19SWang Xiaoguang prealloc_end + 1 - prealloc_start); 2647efa56464SYan, Zheng if (ret) 2648efa56464SYan, Zheng goto out; 2649efa56464SYan, Zheng 265018513091SWang Xiaoguang cur_offset = prealloc_start; 2651efa56464SYan, Zheng while (nr < cluster->nr) { 2652efa56464SYan, Zheng start = cluster->boundary[nr] - offset; 2653efa56464SYan, Zheng if (nr + 1 < cluster->nr) 2654efa56464SYan, Zheng end = cluster->boundary[nr + 1] - 1 - offset; 2655efa56464SYan, Zheng else 2656efa56464SYan, Zheng end = cluster->end - offset; 2657efa56464SYan, Zheng 2658d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 2659efa56464SYan, Zheng num_bytes = end + 1 - start; 266018513091SWang Xiaoguang if (cur_offset < start) 2661bc42bda2SQu Wenruo btrfs_free_reserved_data_space(inode, data_reserved, 2662bc42bda2SQu Wenruo cur_offset, start - cur_offset); 2663efa56464SYan, Zheng ret = btrfs_prealloc_file_range(inode, 0, start, 2664efa56464SYan, Zheng num_bytes, num_bytes, 2665efa56464SYan, Zheng end + 1, &alloc_hint); 266618513091SWang Xiaoguang cur_offset = end + 1; 2667d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 2668efa56464SYan, Zheng if (ret) 2669efa56464SYan, Zheng break; 2670efa56464SYan, Zheng nr++; 2671efa56464SYan, Zheng } 267218513091SWang Xiaoguang if (cur_offset < prealloc_end) 2673bc42bda2SQu Wenruo btrfs_free_reserved_data_space(inode, data_reserved, 2674bc42bda2SQu Wenruo cur_offset, prealloc_end + 1 - cur_offset); 2675efa56464SYan, Zheng out: 26765955102cSAl Viro inode_unlock(inode); 2677364ecf36SQu Wenruo extent_changeset_free(data_reserved); 2678efa56464SYan, Zheng return ret; 2679efa56464SYan, Zheng } 2680efa56464SYan, Zheng 2681efa56464SYan, Zheng static noinline_for_stack 26820257bb82SYan, Zheng int setup_extent_mapping(struct inode *inode, u64 start, u64 end, 26830257bb82SYan, Zheng u64 block_start) 26845d4f98a2SYan Zheng { 26855d4f98a2SYan Zheng struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 26865d4f98a2SYan Zheng struct extent_map *em; 26870257bb82SYan, Zheng int ret = 0; 26885d4f98a2SYan Zheng 2689172ddd60SDavid Sterba em = alloc_extent_map(); 26900257bb82SYan, Zheng if (!em) 26910257bb82SYan, Zheng return -ENOMEM; 26920257bb82SYan, Zheng 26935d4f98a2SYan Zheng em->start = start; 26940257bb82SYan, Zheng em->len = end + 1 - start; 26950257bb82SYan, Zheng em->block_len = em->len; 26960257bb82SYan, Zheng em->block_start = block_start; 26975d4f98a2SYan Zheng set_bit(EXTENT_FLAG_PINNED, &em->flags); 26985d4f98a2SYan Zheng 2699d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 27005d4f98a2SYan Zheng while (1) { 2701890871beSChris Mason write_lock(&em_tree->lock); 270209a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 2703890871beSChris Mason write_unlock(&em_tree->lock); 27045d4f98a2SYan Zheng if (ret != -EEXIST) { 27055d4f98a2SYan Zheng free_extent_map(em); 27065d4f98a2SYan Zheng break; 27075d4f98a2SYan Zheng } 2708dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0); 27095d4f98a2SYan Zheng } 2710d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 27110257bb82SYan, Zheng return ret; 27120257bb82SYan, Zheng } 27135d4f98a2SYan Zheng 2714726a3421SQu Wenruo /* 2715726a3421SQu Wenruo * Allow error injection to test balance cancellation 2716726a3421SQu Wenruo */ 2717726a3421SQu Wenruo int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info) 2718726a3421SQu Wenruo { 2719726a3421SQu Wenruo return atomic_read(&fs_info->balance_cancel_req); 2720726a3421SQu Wenruo } 2721726a3421SQu Wenruo ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE); 2722726a3421SQu Wenruo 27230257bb82SYan, Zheng static int relocate_file_extent_cluster(struct inode *inode, 27240257bb82SYan, Zheng struct file_extent_cluster *cluster) 27250257bb82SYan, Zheng { 27262ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 27270257bb82SYan, Zheng u64 page_start; 27280257bb82SYan, Zheng u64 page_end; 27290257bb82SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 27300257bb82SYan, Zheng unsigned long index; 27310257bb82SYan, Zheng unsigned long last_index; 27320257bb82SYan, Zheng struct page *page; 27330257bb82SYan, Zheng struct file_ra_state *ra; 27343b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 27350257bb82SYan, Zheng int nr = 0; 27360257bb82SYan, Zheng int ret = 0; 27370257bb82SYan, Zheng 27380257bb82SYan, Zheng if (!cluster->nr) 27390257bb82SYan, Zheng return 0; 27400257bb82SYan, Zheng 27410257bb82SYan, Zheng ra = kzalloc(sizeof(*ra), GFP_NOFS); 27420257bb82SYan, Zheng if (!ra) 27430257bb82SYan, Zheng return -ENOMEM; 27440257bb82SYan, Zheng 2745efa56464SYan, Zheng ret = prealloc_file_extent_cluster(inode, cluster); 27460257bb82SYan, Zheng if (ret) 2747efa56464SYan, Zheng goto out; 27480257bb82SYan, Zheng 27490257bb82SYan, Zheng file_ra_state_init(ra, inode->i_mapping); 27500257bb82SYan, Zheng 2751efa56464SYan, Zheng ret = setup_extent_mapping(inode, cluster->start - offset, 2752efa56464SYan, Zheng cluster->end - offset, cluster->start); 2753efa56464SYan, Zheng if (ret) 2754efa56464SYan, Zheng goto out; 2755efa56464SYan, Zheng 275609cbfeafSKirill A. Shutemov index = (cluster->start - offset) >> PAGE_SHIFT; 275709cbfeafSKirill A. Shutemov last_index = (cluster->end - offset) >> PAGE_SHIFT; 27580257bb82SYan, Zheng while (index <= last_index) { 27599f3db423SNikolay Borisov ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), 27609f3db423SNikolay Borisov PAGE_SIZE); 2761efa56464SYan, Zheng if (ret) 2762efa56464SYan, Zheng goto out; 2763efa56464SYan, Zheng 27640257bb82SYan, Zheng page = find_lock_page(inode->i_mapping, index); 27650257bb82SYan, Zheng if (!page) { 27660257bb82SYan, Zheng page_cache_sync_readahead(inode->i_mapping, 27670257bb82SYan, Zheng ra, NULL, index, 27680257bb82SYan, Zheng last_index + 1 - index); 2769a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, index, 27703b16a4e3SJosef Bacik mask); 27710257bb82SYan, Zheng if (!page) { 2772691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 277343b18595SQu Wenruo PAGE_SIZE, true); 277444db1216SFilipe Manana btrfs_delalloc_release_extents(BTRFS_I(inode), 27758702ba93SQu Wenruo PAGE_SIZE); 27760257bb82SYan, Zheng ret = -ENOMEM; 2777efa56464SYan, Zheng goto out; 27780257bb82SYan, Zheng } 27790257bb82SYan, Zheng } 27800257bb82SYan, Zheng 27810257bb82SYan, Zheng if (PageReadahead(page)) { 27820257bb82SYan, Zheng page_cache_async_readahead(inode->i_mapping, 27830257bb82SYan, Zheng ra, NULL, page, index, 27840257bb82SYan, Zheng last_index + 1 - index); 27850257bb82SYan, Zheng } 27860257bb82SYan, Zheng 27870257bb82SYan, Zheng if (!PageUptodate(page)) { 27880257bb82SYan, Zheng btrfs_readpage(NULL, page); 27890257bb82SYan, Zheng lock_page(page); 27900257bb82SYan, Zheng if (!PageUptodate(page)) { 27910257bb82SYan, Zheng unlock_page(page); 279209cbfeafSKirill A. Shutemov put_page(page); 2793691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 279443b18595SQu Wenruo PAGE_SIZE, true); 27958b62f87bSJosef Bacik btrfs_delalloc_release_extents(BTRFS_I(inode), 27968702ba93SQu Wenruo PAGE_SIZE); 27970257bb82SYan, Zheng ret = -EIO; 2798efa56464SYan, Zheng goto out; 27990257bb82SYan, Zheng } 28000257bb82SYan, Zheng } 28010257bb82SYan, Zheng 28024eee4fa4SMiao Xie page_start = page_offset(page); 280309cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 28040257bb82SYan, Zheng 2805d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); 28060257bb82SYan, Zheng 28070257bb82SYan, Zheng set_page_extent_mapped(page); 28080257bb82SYan, Zheng 28090257bb82SYan, Zheng if (nr < cluster->nr && 28100257bb82SYan, Zheng page_start + offset == cluster->boundary[nr]) { 28110257bb82SYan, Zheng set_extent_bits(&BTRFS_I(inode)->io_tree, 28120257bb82SYan, Zheng page_start, page_end, 2813ceeb0ae7SDavid Sterba EXTENT_BOUNDARY); 28140257bb82SYan, Zheng nr++; 28150257bb82SYan, Zheng } 28160257bb82SYan, Zheng 2817765f3cebSNikolay Borisov ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0, 2818330a5827SNikolay Borisov NULL); 2819765f3cebSNikolay Borisov if (ret) { 2820765f3cebSNikolay Borisov unlock_page(page); 2821765f3cebSNikolay Borisov put_page(page); 2822765f3cebSNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 282343b18595SQu Wenruo PAGE_SIZE, true); 2824765f3cebSNikolay Borisov btrfs_delalloc_release_extents(BTRFS_I(inode), 28258702ba93SQu Wenruo PAGE_SIZE); 2826765f3cebSNikolay Borisov 2827765f3cebSNikolay Borisov clear_extent_bits(&BTRFS_I(inode)->io_tree, 2828765f3cebSNikolay Borisov page_start, page_end, 2829765f3cebSNikolay Borisov EXTENT_LOCKED | EXTENT_BOUNDARY); 2830765f3cebSNikolay Borisov goto out; 2831765f3cebSNikolay Borisov 2832765f3cebSNikolay Borisov } 28330257bb82SYan, Zheng set_page_dirty(page); 28340257bb82SYan, Zheng 28350257bb82SYan, Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 2836d0082371SJeff Mahoney page_start, page_end); 28370257bb82SYan, Zheng unlock_page(page); 283809cbfeafSKirill A. Shutemov put_page(page); 28390257bb82SYan, Zheng 28400257bb82SYan, Zheng index++; 28418702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE); 2842efa56464SYan, Zheng balance_dirty_pages_ratelimited(inode->i_mapping); 28432ff7e61eSJeff Mahoney btrfs_throttle(fs_info); 28447f913c7cSQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 28457f913c7cSQu Wenruo ret = -ECANCELED; 28467f913c7cSQu Wenruo goto out; 28477f913c7cSQu Wenruo } 28480257bb82SYan, Zheng } 28490257bb82SYan, Zheng WARN_ON(nr != cluster->nr); 2850efa56464SYan, Zheng out: 28510257bb82SYan, Zheng kfree(ra); 28520257bb82SYan, Zheng return ret; 28530257bb82SYan, Zheng } 28540257bb82SYan, Zheng 28550257bb82SYan, Zheng static noinline_for_stack 28560257bb82SYan, Zheng int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, 28570257bb82SYan, Zheng struct file_extent_cluster *cluster) 28580257bb82SYan, Zheng { 28590257bb82SYan, Zheng int ret; 28600257bb82SYan, Zheng 28610257bb82SYan, Zheng if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { 28620257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28630257bb82SYan, Zheng if (ret) 28640257bb82SYan, Zheng return ret; 28650257bb82SYan, Zheng cluster->nr = 0; 28660257bb82SYan, Zheng } 28670257bb82SYan, Zheng 28680257bb82SYan, Zheng if (!cluster->nr) 28690257bb82SYan, Zheng cluster->start = extent_key->objectid; 28700257bb82SYan, Zheng else 28710257bb82SYan, Zheng BUG_ON(cluster->nr >= MAX_EXTENTS); 28720257bb82SYan, Zheng cluster->end = extent_key->objectid + extent_key->offset - 1; 28730257bb82SYan, Zheng cluster->boundary[cluster->nr] = extent_key->objectid; 28740257bb82SYan, Zheng cluster->nr++; 28750257bb82SYan, Zheng 28760257bb82SYan, Zheng if (cluster->nr >= MAX_EXTENTS) { 28770257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28780257bb82SYan, Zheng if (ret) 28790257bb82SYan, Zheng return ret; 28800257bb82SYan, Zheng cluster->nr = 0; 28810257bb82SYan, Zheng } 28820257bb82SYan, Zheng return 0; 28835d4f98a2SYan Zheng } 28845d4f98a2SYan Zheng 28855d4f98a2SYan Zheng /* 28865d4f98a2SYan Zheng * helper to add a tree block to the list. 28875d4f98a2SYan Zheng * the major work is getting the generation and level of the block 28885d4f98a2SYan Zheng */ 28895d4f98a2SYan Zheng static int add_tree_block(struct reloc_control *rc, 28905d4f98a2SYan Zheng struct btrfs_key *extent_key, 28915d4f98a2SYan Zheng struct btrfs_path *path, 28925d4f98a2SYan Zheng struct rb_root *blocks) 28935d4f98a2SYan Zheng { 28945d4f98a2SYan Zheng struct extent_buffer *eb; 28955d4f98a2SYan Zheng struct btrfs_extent_item *ei; 28965d4f98a2SYan Zheng struct btrfs_tree_block_info *bi; 28975d4f98a2SYan Zheng struct tree_block *block; 28985d4f98a2SYan Zheng struct rb_node *rb_node; 28995d4f98a2SYan Zheng u32 item_size; 29005d4f98a2SYan Zheng int level = -1; 29017fdf4b60SWang Shilong u64 generation; 29025d4f98a2SYan Zheng 29035d4f98a2SYan Zheng eb = path->nodes[0]; 29045d4f98a2SYan Zheng item_size = btrfs_item_size_nr(eb, path->slots[0]); 29055d4f98a2SYan Zheng 29063173a18fSJosef Bacik if (extent_key->type == BTRFS_METADATA_ITEM_KEY || 29073173a18fSJosef Bacik item_size >= sizeof(*ei) + sizeof(*bi)) { 29085d4f98a2SYan Zheng ei = btrfs_item_ptr(eb, path->slots[0], 29095d4f98a2SYan Zheng struct btrfs_extent_item); 29103173a18fSJosef Bacik if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { 29115d4f98a2SYan Zheng bi = (struct btrfs_tree_block_info *)(ei + 1); 29125d4f98a2SYan Zheng level = btrfs_tree_block_level(eb, bi); 29135d4f98a2SYan Zheng } else { 29143173a18fSJosef Bacik level = (int)extent_key->offset; 29153173a18fSJosef Bacik } 29163173a18fSJosef Bacik generation = btrfs_extent_generation(eb, ei); 29176d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 2918ba3c2b19SNikolay Borisov btrfs_print_v0_err(eb->fs_info); 2919ba3c2b19SNikolay Borisov btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL); 2920ba3c2b19SNikolay Borisov return -EINVAL; 29213173a18fSJosef Bacik } else { 29225d4f98a2SYan Zheng BUG(); 29235d4f98a2SYan Zheng } 29245d4f98a2SYan Zheng 2925b3b4aa74SDavid Sterba btrfs_release_path(path); 29265d4f98a2SYan Zheng 29275d4f98a2SYan Zheng BUG_ON(level == -1); 29285d4f98a2SYan Zheng 29295d4f98a2SYan Zheng block = kmalloc(sizeof(*block), GFP_NOFS); 29305d4f98a2SYan Zheng if (!block) 29315d4f98a2SYan Zheng return -ENOMEM; 29325d4f98a2SYan Zheng 29335d4f98a2SYan Zheng block->bytenr = extent_key->objectid; 2934da17066cSJeff Mahoney block->key.objectid = rc->extent_root->fs_info->nodesize; 29355d4f98a2SYan Zheng block->key.offset = generation; 29365d4f98a2SYan Zheng block->level = level; 29375d4f98a2SYan Zheng block->key_ready = 0; 29385d4f98a2SYan Zheng 2939e9a28dc5SQu Wenruo rb_node = rb_simple_insert(blocks, block->bytenr, &block->rb_node); 294043c04fb1SJeff Mahoney if (rb_node) 2941982c92cbSQu Wenruo btrfs_backref_panic(rc->extent_root->fs_info, block->bytenr, 2942982c92cbSQu Wenruo -EEXIST); 29435d4f98a2SYan Zheng 29445d4f98a2SYan Zheng return 0; 29455d4f98a2SYan Zheng } 29465d4f98a2SYan Zheng 29475d4f98a2SYan Zheng /* 29485d4f98a2SYan Zheng * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY 29495d4f98a2SYan Zheng */ 29505d4f98a2SYan Zheng static int __add_tree_block(struct reloc_control *rc, 29515d4f98a2SYan Zheng u64 bytenr, u32 blocksize, 29525d4f98a2SYan Zheng struct rb_root *blocks) 29535d4f98a2SYan Zheng { 29540b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 29555d4f98a2SYan Zheng struct btrfs_path *path; 29565d4f98a2SYan Zheng struct btrfs_key key; 29575d4f98a2SYan Zheng int ret; 29580b246afaSJeff Mahoney bool skinny = btrfs_fs_incompat(fs_info, SKINNY_METADATA); 29595d4f98a2SYan Zheng 29607476dfdaSDavid Sterba if (tree_block_processed(bytenr, rc)) 29615d4f98a2SYan Zheng return 0; 29625d4f98a2SYan Zheng 2963e9a28dc5SQu Wenruo if (rb_simple_search(blocks, bytenr)) 29645d4f98a2SYan Zheng return 0; 29655d4f98a2SYan Zheng 29665d4f98a2SYan Zheng path = btrfs_alloc_path(); 29675d4f98a2SYan Zheng if (!path) 29685d4f98a2SYan Zheng return -ENOMEM; 2969aee68ee5SJosef Bacik again: 29705d4f98a2SYan Zheng key.objectid = bytenr; 2971aee68ee5SJosef Bacik if (skinny) { 2972aee68ee5SJosef Bacik key.type = BTRFS_METADATA_ITEM_KEY; 2973aee68ee5SJosef Bacik key.offset = (u64)-1; 2974aee68ee5SJosef Bacik } else { 29755d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 29765d4f98a2SYan Zheng key.offset = blocksize; 2977aee68ee5SJosef Bacik } 29785d4f98a2SYan Zheng 29795d4f98a2SYan Zheng path->search_commit_root = 1; 29805d4f98a2SYan Zheng path->skip_locking = 1; 29815d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); 29825d4f98a2SYan Zheng if (ret < 0) 29835d4f98a2SYan Zheng goto out; 29845d4f98a2SYan Zheng 2985aee68ee5SJosef Bacik if (ret > 0 && skinny) { 2986aee68ee5SJosef Bacik if (path->slots[0]) { 2987aee68ee5SJosef Bacik path->slots[0]--; 2988aee68ee5SJosef Bacik btrfs_item_key_to_cpu(path->nodes[0], &key, 2989aee68ee5SJosef Bacik path->slots[0]); 29903173a18fSJosef Bacik if (key.objectid == bytenr && 2991aee68ee5SJosef Bacik (key.type == BTRFS_METADATA_ITEM_KEY || 2992aee68ee5SJosef Bacik (key.type == BTRFS_EXTENT_ITEM_KEY && 2993aee68ee5SJosef Bacik key.offset == blocksize))) 29943173a18fSJosef Bacik ret = 0; 29953173a18fSJosef Bacik } 2996aee68ee5SJosef Bacik 2997aee68ee5SJosef Bacik if (ret) { 2998aee68ee5SJosef Bacik skinny = false; 2999aee68ee5SJosef Bacik btrfs_release_path(path); 3000aee68ee5SJosef Bacik goto again; 3001aee68ee5SJosef Bacik } 3002aee68ee5SJosef Bacik } 3003cdccee99SLiu Bo if (ret) { 3004cdccee99SLiu Bo ASSERT(ret == 1); 3005cdccee99SLiu Bo btrfs_print_leaf(path->nodes[0]); 3006cdccee99SLiu Bo btrfs_err(fs_info, 3007cdccee99SLiu Bo "tree block extent item (%llu) is not found in extent tree", 3008cdccee99SLiu Bo bytenr); 3009cdccee99SLiu Bo WARN_ON(1); 3010cdccee99SLiu Bo ret = -EINVAL; 3011cdccee99SLiu Bo goto out; 3012cdccee99SLiu Bo } 30133173a18fSJosef Bacik 30145d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, blocks); 30155d4f98a2SYan Zheng out: 30165d4f98a2SYan Zheng btrfs_free_path(path); 30175d4f98a2SYan Zheng return ret; 30185d4f98a2SYan Zheng } 30195d4f98a2SYan Zheng 30200af3d00bSJosef Bacik static int delete_block_group_cache(struct btrfs_fs_info *fs_info, 302132da5386SDavid Sterba struct btrfs_block_group *block_group, 30221bbc621eSChris Mason struct inode *inode, 30231bbc621eSChris Mason u64 ino) 30240af3d00bSJosef Bacik { 30250af3d00bSJosef Bacik struct btrfs_key key; 30260af3d00bSJosef Bacik struct btrfs_root *root = fs_info->tree_root; 30270af3d00bSJosef Bacik struct btrfs_trans_handle *trans; 30280af3d00bSJosef Bacik int ret = 0; 30290af3d00bSJosef Bacik 30300af3d00bSJosef Bacik if (inode) 30310af3d00bSJosef Bacik goto truncate; 30320af3d00bSJosef Bacik 30330af3d00bSJosef Bacik key.objectid = ino; 30340af3d00bSJosef Bacik key.type = BTRFS_INODE_ITEM_KEY; 30350af3d00bSJosef Bacik key.offset = 0; 30360af3d00bSJosef Bacik 30374c66e0d4SDavid Sterba inode = btrfs_iget(fs_info->sb, &key, root); 30382e19f1f9SAl Viro if (IS_ERR(inode)) 30390af3d00bSJosef Bacik return -ENOENT; 30400af3d00bSJosef Bacik 30410af3d00bSJosef Bacik truncate: 30422ff7e61eSJeff Mahoney ret = btrfs_check_trunc_cache_free_space(fs_info, 30437b61cd92SMiao Xie &fs_info->global_block_rsv); 30447b61cd92SMiao Xie if (ret) 30457b61cd92SMiao Xie goto out; 30467b61cd92SMiao Xie 30477a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 30480af3d00bSJosef Bacik if (IS_ERR(trans)) { 30493612b495STsutomu Itoh ret = PTR_ERR(trans); 30500af3d00bSJosef Bacik goto out; 30510af3d00bSJosef Bacik } 30520af3d00bSJosef Bacik 305377ab86bfSJeff Mahoney ret = btrfs_truncate_free_space_cache(trans, block_group, inode); 30540af3d00bSJosef Bacik 30553a45bb20SJeff Mahoney btrfs_end_transaction(trans); 30562ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 30570af3d00bSJosef Bacik out: 30580af3d00bSJosef Bacik iput(inode); 30590af3d00bSJosef Bacik return ret; 30600af3d00bSJosef Bacik } 30610af3d00bSJosef Bacik 30625d4f98a2SYan Zheng /* 306319b546d7SQu Wenruo * Locate the free space cache EXTENT_DATA in root tree leaf and delete the 306419b546d7SQu Wenruo * cache inode, to avoid free space cache data extent blocking data relocation. 30655d4f98a2SYan Zheng */ 306619b546d7SQu Wenruo static int delete_v1_space_cache(struct extent_buffer *leaf, 306719b546d7SQu Wenruo struct btrfs_block_group *block_group, 306819b546d7SQu Wenruo u64 data_bytenr) 30695d4f98a2SYan Zheng { 307019b546d7SQu Wenruo u64 space_cache_ino; 307119b546d7SQu Wenruo struct btrfs_file_extent_item *ei; 30725d4f98a2SYan Zheng struct btrfs_key key; 307319b546d7SQu Wenruo bool found = false; 307419b546d7SQu Wenruo int i; 30755d4f98a2SYan Zheng int ret; 30765d4f98a2SYan Zheng 307719b546d7SQu Wenruo if (btrfs_header_owner(leaf) != BTRFS_ROOT_TREE_OBJECTID) 307819b546d7SQu Wenruo return 0; 30795d4f98a2SYan Zheng 308019b546d7SQu Wenruo for (i = 0; i < btrfs_header_nritems(leaf); i++) { 308119b546d7SQu Wenruo btrfs_item_key_to_cpu(leaf, &key, i); 308219b546d7SQu Wenruo if (key.type != BTRFS_EXTENT_DATA_KEY) 308319b546d7SQu Wenruo continue; 308419b546d7SQu Wenruo ei = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 308519b546d7SQu Wenruo if (btrfs_file_extent_type(leaf, ei) == BTRFS_FILE_EXTENT_REG && 308619b546d7SQu Wenruo btrfs_file_extent_disk_bytenr(leaf, ei) == data_bytenr) { 308719b546d7SQu Wenruo found = true; 308819b546d7SQu Wenruo space_cache_ino = key.objectid; 308919b546d7SQu Wenruo break; 309019b546d7SQu Wenruo } 309119b546d7SQu Wenruo } 309219b546d7SQu Wenruo if (!found) 309319b546d7SQu Wenruo return -ENOENT; 309419b546d7SQu Wenruo ret = delete_block_group_cache(leaf->fs_info, block_group, NULL, 309519b546d7SQu Wenruo space_cache_ino); 30960af3d00bSJosef Bacik return ret; 30975d4f98a2SYan Zheng } 30985d4f98a2SYan Zheng 30995d4f98a2SYan Zheng /* 31002c016dc2SLiu Bo * helper to find all tree blocks that reference a given data extent 31015d4f98a2SYan Zheng */ 31025d4f98a2SYan Zheng static noinline_for_stack 31035d4f98a2SYan Zheng int add_data_references(struct reloc_control *rc, 31045d4f98a2SYan Zheng struct btrfs_key *extent_key, 31055d4f98a2SYan Zheng struct btrfs_path *path, 31065d4f98a2SYan Zheng struct rb_root *blocks) 31075d4f98a2SYan Zheng { 310819b546d7SQu Wenruo struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 310919b546d7SQu Wenruo struct ulist *leaves = NULL; 311019b546d7SQu Wenruo struct ulist_iterator leaf_uiter; 311119b546d7SQu Wenruo struct ulist_node *ref_node = NULL; 311219b546d7SQu Wenruo const u32 blocksize = fs_info->nodesize; 3113647f63bdSFilipe David Borba Manana int ret = 0; 31145d4f98a2SYan Zheng 3115b3b4aa74SDavid Sterba btrfs_release_path(path); 311619b546d7SQu Wenruo ret = btrfs_find_all_leafs(NULL, fs_info, extent_key->objectid, 311719b546d7SQu Wenruo 0, &leaves, NULL, true); 311819b546d7SQu Wenruo if (ret < 0) 311919b546d7SQu Wenruo return ret; 312019b546d7SQu Wenruo 312119b546d7SQu Wenruo ULIST_ITER_INIT(&leaf_uiter); 312219b546d7SQu Wenruo while ((ref_node = ulist_next(leaves, &leaf_uiter))) { 312319b546d7SQu Wenruo struct extent_buffer *eb; 312419b546d7SQu Wenruo 312519b546d7SQu Wenruo eb = read_tree_block(fs_info, ref_node->val, 0, 0, NULL); 312619b546d7SQu Wenruo if (IS_ERR(eb)) { 312719b546d7SQu Wenruo ret = PTR_ERR(eb); 312819b546d7SQu Wenruo break; 312919b546d7SQu Wenruo } 313019b546d7SQu Wenruo ret = delete_v1_space_cache(eb, rc->block_group, 313119b546d7SQu Wenruo extent_key->objectid); 313219b546d7SQu Wenruo free_extent_buffer(eb); 313319b546d7SQu Wenruo if (ret < 0) 313419b546d7SQu Wenruo break; 313519b546d7SQu Wenruo ret = __add_tree_block(rc, ref_node->val, blocksize, blocks); 313619b546d7SQu Wenruo if (ret < 0) 313719b546d7SQu Wenruo break; 313819b546d7SQu Wenruo } 313919b546d7SQu Wenruo if (ret < 0) 31405d4f98a2SYan Zheng free_block_list(blocks); 314119b546d7SQu Wenruo ulist_free(leaves); 314219b546d7SQu Wenruo return ret; 31435d4f98a2SYan Zheng } 31445d4f98a2SYan Zheng 31455d4f98a2SYan Zheng /* 31462c016dc2SLiu Bo * helper to find next unprocessed extent 31475d4f98a2SYan Zheng */ 31485d4f98a2SYan Zheng static noinline_for_stack 3149147d256eSZhaolei int find_next_extent(struct reloc_control *rc, struct btrfs_path *path, 31503fd0a558SYan, Zheng struct btrfs_key *extent_key) 31515d4f98a2SYan Zheng { 31520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31535d4f98a2SYan Zheng struct btrfs_key key; 31545d4f98a2SYan Zheng struct extent_buffer *leaf; 31555d4f98a2SYan Zheng u64 start, end, last; 31565d4f98a2SYan Zheng int ret; 31575d4f98a2SYan Zheng 3158b3470b5dSDavid Sterba last = rc->block_group->start + rc->block_group->length; 31595d4f98a2SYan Zheng while (1) { 31605d4f98a2SYan Zheng cond_resched(); 31615d4f98a2SYan Zheng if (rc->search_start >= last) { 31625d4f98a2SYan Zheng ret = 1; 31635d4f98a2SYan Zheng break; 31645d4f98a2SYan Zheng } 31655d4f98a2SYan Zheng 31665d4f98a2SYan Zheng key.objectid = rc->search_start; 31675d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 31685d4f98a2SYan Zheng key.offset = 0; 31695d4f98a2SYan Zheng 31705d4f98a2SYan Zheng path->search_commit_root = 1; 31715d4f98a2SYan Zheng path->skip_locking = 1; 31725d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 31735d4f98a2SYan Zheng 0, 0); 31745d4f98a2SYan Zheng if (ret < 0) 31755d4f98a2SYan Zheng break; 31765d4f98a2SYan Zheng next: 31775d4f98a2SYan Zheng leaf = path->nodes[0]; 31785d4f98a2SYan Zheng if (path->slots[0] >= btrfs_header_nritems(leaf)) { 31795d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 31805d4f98a2SYan Zheng if (ret != 0) 31815d4f98a2SYan Zheng break; 31825d4f98a2SYan Zheng leaf = path->nodes[0]; 31835d4f98a2SYan Zheng } 31845d4f98a2SYan Zheng 31855d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 31865d4f98a2SYan Zheng if (key.objectid >= last) { 31875d4f98a2SYan Zheng ret = 1; 31885d4f98a2SYan Zheng break; 31895d4f98a2SYan Zheng } 31905d4f98a2SYan Zheng 31913173a18fSJosef Bacik if (key.type != BTRFS_EXTENT_ITEM_KEY && 31923173a18fSJosef Bacik key.type != BTRFS_METADATA_ITEM_KEY) { 31933173a18fSJosef Bacik path->slots[0]++; 31943173a18fSJosef Bacik goto next; 31953173a18fSJosef Bacik } 31963173a18fSJosef Bacik 31973173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY && 31985d4f98a2SYan Zheng key.objectid + key.offset <= rc->search_start) { 31995d4f98a2SYan Zheng path->slots[0]++; 32005d4f98a2SYan Zheng goto next; 32015d4f98a2SYan Zheng } 32025d4f98a2SYan Zheng 32033173a18fSJosef Bacik if (key.type == BTRFS_METADATA_ITEM_KEY && 32040b246afaSJeff Mahoney key.objectid + fs_info->nodesize <= 32053173a18fSJosef Bacik rc->search_start) { 32063173a18fSJosef Bacik path->slots[0]++; 32073173a18fSJosef Bacik goto next; 32083173a18fSJosef Bacik } 32093173a18fSJosef Bacik 32105d4f98a2SYan Zheng ret = find_first_extent_bit(&rc->processed_blocks, 32115d4f98a2SYan Zheng key.objectid, &start, &end, 3212e6138876SJosef Bacik EXTENT_DIRTY, NULL); 32135d4f98a2SYan Zheng 32145d4f98a2SYan Zheng if (ret == 0 && start <= key.objectid) { 3215b3b4aa74SDavid Sterba btrfs_release_path(path); 32165d4f98a2SYan Zheng rc->search_start = end + 1; 32175d4f98a2SYan Zheng } else { 32183173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY) 32195d4f98a2SYan Zheng rc->search_start = key.objectid + key.offset; 32203173a18fSJosef Bacik else 32213173a18fSJosef Bacik rc->search_start = key.objectid + 32220b246afaSJeff Mahoney fs_info->nodesize; 32233fd0a558SYan, Zheng memcpy(extent_key, &key, sizeof(key)); 32245d4f98a2SYan Zheng return 0; 32255d4f98a2SYan Zheng } 32265d4f98a2SYan Zheng } 3227b3b4aa74SDavid Sterba btrfs_release_path(path); 32285d4f98a2SYan Zheng return ret; 32295d4f98a2SYan Zheng } 32305d4f98a2SYan Zheng 32315d4f98a2SYan Zheng static void set_reloc_control(struct reloc_control *rc) 32325d4f98a2SYan Zheng { 32335d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 32347585717fSChris Mason 32357585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 32365d4f98a2SYan Zheng fs_info->reloc_ctl = rc; 32377585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 32385d4f98a2SYan Zheng } 32395d4f98a2SYan Zheng 32405d4f98a2SYan Zheng static void unset_reloc_control(struct reloc_control *rc) 32415d4f98a2SYan Zheng { 32425d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 32437585717fSChris Mason 32447585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 32455d4f98a2SYan Zheng fs_info->reloc_ctl = NULL; 32467585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 32475d4f98a2SYan Zheng } 32485d4f98a2SYan Zheng 32495d4f98a2SYan Zheng static int check_extent_flags(u64 flags) 32505d4f98a2SYan Zheng { 32515d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 32525d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 32535d4f98a2SYan Zheng return 1; 32545d4f98a2SYan Zheng if (!(flags & BTRFS_EXTENT_FLAG_DATA) && 32555d4f98a2SYan Zheng !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 32565d4f98a2SYan Zheng return 1; 32575d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 32585d4f98a2SYan Zheng (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) 32595d4f98a2SYan Zheng return 1; 32605d4f98a2SYan Zheng return 0; 32615d4f98a2SYan Zheng } 32625d4f98a2SYan Zheng 32633fd0a558SYan, Zheng static noinline_for_stack 32643fd0a558SYan, Zheng int prepare_to_relocate(struct reloc_control *rc) 32653fd0a558SYan, Zheng { 32663fd0a558SYan, Zheng struct btrfs_trans_handle *trans; 3267ac2fabacSJosef Bacik int ret; 32683fd0a558SYan, Zheng 32692ff7e61eSJeff Mahoney rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root->fs_info, 327066d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 32713fd0a558SYan, Zheng if (!rc->block_rsv) 32723fd0a558SYan, Zheng return -ENOMEM; 32733fd0a558SYan, Zheng 32743fd0a558SYan, Zheng memset(&rc->cluster, 0, sizeof(rc->cluster)); 3275b3470b5dSDavid Sterba rc->search_start = rc->block_group->start; 32763fd0a558SYan, Zheng rc->extents_found = 0; 32773fd0a558SYan, Zheng rc->nodes_relocated = 0; 32783fd0a558SYan, Zheng rc->merging_rsv_size = 0; 32790647bf56SWang Shilong rc->reserved_bytes = 0; 3280da17066cSJeff Mahoney rc->block_rsv->size = rc->extent_root->fs_info->nodesize * 32810647bf56SWang Shilong RELOCATION_RESERVED_NODES; 3282ac2fabacSJosef Bacik ret = btrfs_block_rsv_refill(rc->extent_root, 3283ac2fabacSJosef Bacik rc->block_rsv, rc->block_rsv->size, 3284ac2fabacSJosef Bacik BTRFS_RESERVE_FLUSH_ALL); 3285ac2fabacSJosef Bacik if (ret) 3286ac2fabacSJosef Bacik return ret; 32873fd0a558SYan, Zheng 32883fd0a558SYan, Zheng rc->create_reloc_tree = 1; 32893fd0a558SYan, Zheng set_reloc_control(rc); 32903fd0a558SYan, Zheng 32917a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 329228818947SLiu Bo if (IS_ERR(trans)) { 329328818947SLiu Bo unset_reloc_control(rc); 329428818947SLiu Bo /* 329528818947SLiu Bo * extent tree is not a ref_cow tree and has no reloc_root to 329628818947SLiu Bo * cleanup. And callers are responsible to free the above 329728818947SLiu Bo * block rsv. 329828818947SLiu Bo */ 329928818947SLiu Bo return PTR_ERR(trans); 330028818947SLiu Bo } 33013a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 33023fd0a558SYan, Zheng return 0; 33033fd0a558SYan, Zheng } 330476dda93cSYan, Zheng 33055d4f98a2SYan Zheng static noinline_for_stack int relocate_block_group(struct reloc_control *rc) 33065d4f98a2SYan Zheng { 33072ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 33085d4f98a2SYan Zheng struct rb_root blocks = RB_ROOT; 33095d4f98a2SYan Zheng struct btrfs_key key; 33105d4f98a2SYan Zheng struct btrfs_trans_handle *trans = NULL; 33115d4f98a2SYan Zheng struct btrfs_path *path; 33125d4f98a2SYan Zheng struct btrfs_extent_item *ei; 33135d4f98a2SYan Zheng u64 flags; 33145d4f98a2SYan Zheng u32 item_size; 33155d4f98a2SYan Zheng int ret; 33165d4f98a2SYan Zheng int err = 0; 3317c87f08caSChris Mason int progress = 0; 33185d4f98a2SYan Zheng 33195d4f98a2SYan Zheng path = btrfs_alloc_path(); 33203fd0a558SYan, Zheng if (!path) 33215d4f98a2SYan Zheng return -ENOMEM; 3322e4058b54SDavid Sterba path->reada = READA_FORWARD; 33233fd0a558SYan, Zheng 33243fd0a558SYan, Zheng ret = prepare_to_relocate(rc); 33253fd0a558SYan, Zheng if (ret) { 33263fd0a558SYan, Zheng err = ret; 33273fd0a558SYan, Zheng goto out_free; 33282423fdfbSJiri Slaby } 33295d4f98a2SYan Zheng 33305d4f98a2SYan Zheng while (1) { 33310647bf56SWang Shilong rc->reserved_bytes = 0; 33320647bf56SWang Shilong ret = btrfs_block_rsv_refill(rc->extent_root, 33330647bf56SWang Shilong rc->block_rsv, rc->block_rsv->size, 33340647bf56SWang Shilong BTRFS_RESERVE_FLUSH_ALL); 33350647bf56SWang Shilong if (ret) { 33360647bf56SWang Shilong err = ret; 33370647bf56SWang Shilong break; 33380647bf56SWang Shilong } 3339c87f08caSChris Mason progress++; 3340a22285a6SYan, Zheng trans = btrfs_start_transaction(rc->extent_root, 0); 33410f788c58SLiu Bo if (IS_ERR(trans)) { 33420f788c58SLiu Bo err = PTR_ERR(trans); 33430f788c58SLiu Bo trans = NULL; 33440f788c58SLiu Bo break; 33450f788c58SLiu Bo } 3346c87f08caSChris Mason restart: 33473fd0a558SYan, Zheng if (update_backref_cache(trans, &rc->backref_cache)) { 33483a45bb20SJeff Mahoney btrfs_end_transaction(trans); 334942a657f5SPan Bian trans = NULL; 33503fd0a558SYan, Zheng continue; 33513fd0a558SYan, Zheng } 33523fd0a558SYan, Zheng 3353147d256eSZhaolei ret = find_next_extent(rc, path, &key); 33545d4f98a2SYan Zheng if (ret < 0) 33555d4f98a2SYan Zheng err = ret; 33565d4f98a2SYan Zheng if (ret != 0) 33575d4f98a2SYan Zheng break; 33585d4f98a2SYan Zheng 33595d4f98a2SYan Zheng rc->extents_found++; 33605d4f98a2SYan Zheng 33615d4f98a2SYan Zheng ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 33625d4f98a2SYan Zheng struct btrfs_extent_item); 33633fd0a558SYan, Zheng item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); 33645d4f98a2SYan Zheng if (item_size >= sizeof(*ei)) { 33655d4f98a2SYan Zheng flags = btrfs_extent_flags(path->nodes[0], ei); 33665d4f98a2SYan Zheng ret = check_extent_flags(flags); 33675d4f98a2SYan Zheng BUG_ON(ret); 33686d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 3369ba3c2b19SNikolay Borisov err = -EINVAL; 3370ba3c2b19SNikolay Borisov btrfs_print_v0_err(trans->fs_info); 3371ba3c2b19SNikolay Borisov btrfs_abort_transaction(trans, err); 3372ba3c2b19SNikolay Borisov break; 33735d4f98a2SYan Zheng } else { 33745d4f98a2SYan Zheng BUG(); 33755d4f98a2SYan Zheng } 33765d4f98a2SYan Zheng 33775d4f98a2SYan Zheng if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 33785d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, &blocks); 33795d4f98a2SYan Zheng } else if (rc->stage == UPDATE_DATA_PTRS && 33805d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 33815d4f98a2SYan Zheng ret = add_data_references(rc, &key, path, &blocks); 33825d4f98a2SYan Zheng } else { 3383b3b4aa74SDavid Sterba btrfs_release_path(path); 33845d4f98a2SYan Zheng ret = 0; 33855d4f98a2SYan Zheng } 33865d4f98a2SYan Zheng if (ret < 0) { 33873fd0a558SYan, Zheng err = ret; 33885d4f98a2SYan Zheng break; 33895d4f98a2SYan Zheng } 33905d4f98a2SYan Zheng 33915d4f98a2SYan Zheng if (!RB_EMPTY_ROOT(&blocks)) { 33925d4f98a2SYan Zheng ret = relocate_tree_blocks(trans, rc, &blocks); 33935d4f98a2SYan Zheng if (ret < 0) { 33943fd0a558SYan, Zheng if (ret != -EAGAIN) { 33955d4f98a2SYan Zheng err = ret; 33965d4f98a2SYan Zheng break; 33975d4f98a2SYan Zheng } 33983fd0a558SYan, Zheng rc->extents_found--; 33993fd0a558SYan, Zheng rc->search_start = key.objectid; 34003fd0a558SYan, Zheng } 34015d4f98a2SYan Zheng } 34025d4f98a2SYan Zheng 34033a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 34042ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 34053fd0a558SYan, Zheng trans = NULL; 34065d4f98a2SYan Zheng 34075d4f98a2SYan Zheng if (rc->stage == MOVE_DATA_EXTENTS && 34085d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 34095d4f98a2SYan Zheng rc->found_file_extent = 1; 34100257bb82SYan, Zheng ret = relocate_data_extent(rc->data_inode, 34113fd0a558SYan, Zheng &key, &rc->cluster); 34125d4f98a2SYan Zheng if (ret < 0) { 34135d4f98a2SYan Zheng err = ret; 34145d4f98a2SYan Zheng break; 34155d4f98a2SYan Zheng } 34165d4f98a2SYan Zheng } 3417f31ea088SQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 3418f31ea088SQu Wenruo err = -ECANCELED; 3419f31ea088SQu Wenruo break; 3420f31ea088SQu Wenruo } 34215d4f98a2SYan Zheng } 3422c87f08caSChris Mason if (trans && progress && err == -ENOSPC) { 342343a7e99dSNikolay Borisov ret = btrfs_force_chunk_alloc(trans, rc->block_group->flags); 34249689457bSShilong Wang if (ret == 1) { 3425c87f08caSChris Mason err = 0; 3426c87f08caSChris Mason progress = 0; 3427c87f08caSChris Mason goto restart; 3428c87f08caSChris Mason } 3429c87f08caSChris Mason } 34303fd0a558SYan, Zheng 3431b3b4aa74SDavid Sterba btrfs_release_path(path); 343291166212SDavid Sterba clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY); 34335d4f98a2SYan Zheng 34345d4f98a2SYan Zheng if (trans) { 34353a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 34362ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 34375d4f98a2SYan Zheng } 34385d4f98a2SYan Zheng 34390257bb82SYan, Zheng if (!err) { 34403fd0a558SYan, Zheng ret = relocate_file_extent_cluster(rc->data_inode, 34413fd0a558SYan, Zheng &rc->cluster); 34420257bb82SYan, Zheng if (ret < 0) 34430257bb82SYan, Zheng err = ret; 34440257bb82SYan, Zheng } 34450257bb82SYan, Zheng 34463fd0a558SYan, Zheng rc->create_reloc_tree = 0; 34473fd0a558SYan, Zheng set_reloc_control(rc); 34480257bb82SYan, Zheng 344913fe1bdbSQu Wenruo btrfs_backref_release_cache(&rc->backref_cache); 345063f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 34515d4f98a2SYan Zheng 34527f913c7cSQu Wenruo /* 34537f913c7cSQu Wenruo * Even in the case when the relocation is cancelled, we should all go 34547f913c7cSQu Wenruo * through prepare_to_merge() and merge_reloc_roots(). 34557f913c7cSQu Wenruo * 34567f913c7cSQu Wenruo * For error (including cancelled balance), prepare_to_merge() will 34577f913c7cSQu Wenruo * mark all reloc trees orphan, then queue them for cleanup in 34587f913c7cSQu Wenruo * merge_reloc_roots() 34597f913c7cSQu Wenruo */ 34603fd0a558SYan, Zheng err = prepare_to_merge(rc, err); 34615d4f98a2SYan Zheng 34625d4f98a2SYan Zheng merge_reloc_roots(rc); 34635d4f98a2SYan Zheng 34643fd0a558SYan, Zheng rc->merge_reloc_tree = 0; 34655d4f98a2SYan Zheng unset_reloc_control(rc); 346663f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 34675d4f98a2SYan Zheng 34685d4f98a2SYan Zheng /* get rid of pinned extents */ 34697a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 347062b99540SQu Wenruo if (IS_ERR(trans)) { 34713612b495STsutomu Itoh err = PTR_ERR(trans); 347262b99540SQu Wenruo goto out_free; 347362b99540SQu Wenruo } 34743a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 34756217b0faSJosef Bacik out_free: 3476d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3477d2311e69SQu Wenruo if (ret < 0 && !err) 3478d2311e69SQu Wenruo err = ret; 34792ff7e61eSJeff Mahoney btrfs_free_block_rsv(fs_info, rc->block_rsv); 34803fd0a558SYan, Zheng btrfs_free_path(path); 34815d4f98a2SYan Zheng return err; 34825d4f98a2SYan Zheng } 34835d4f98a2SYan Zheng 34845d4f98a2SYan Zheng static int __insert_orphan_inode(struct btrfs_trans_handle *trans, 34850257bb82SYan, Zheng struct btrfs_root *root, u64 objectid) 34865d4f98a2SYan Zheng { 34875d4f98a2SYan Zheng struct btrfs_path *path; 34885d4f98a2SYan Zheng struct btrfs_inode_item *item; 34895d4f98a2SYan Zheng struct extent_buffer *leaf; 34905d4f98a2SYan Zheng int ret; 34915d4f98a2SYan Zheng 34925d4f98a2SYan Zheng path = btrfs_alloc_path(); 34935d4f98a2SYan Zheng if (!path) 34945d4f98a2SYan Zheng return -ENOMEM; 34955d4f98a2SYan Zheng 34965d4f98a2SYan Zheng ret = btrfs_insert_empty_inode(trans, root, path, objectid); 34975d4f98a2SYan Zheng if (ret) 34985d4f98a2SYan Zheng goto out; 34995d4f98a2SYan Zheng 35005d4f98a2SYan Zheng leaf = path->nodes[0]; 35015d4f98a2SYan Zheng item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); 3502b159fa28SDavid Sterba memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item)); 35035d4f98a2SYan Zheng btrfs_set_inode_generation(leaf, item, 1); 35040257bb82SYan, Zheng btrfs_set_inode_size(leaf, item, 0); 35055d4f98a2SYan Zheng btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); 35063fd0a558SYan, Zheng btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | 35073fd0a558SYan, Zheng BTRFS_INODE_PREALLOC); 35085d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 35095d4f98a2SYan Zheng out: 35105d4f98a2SYan Zheng btrfs_free_path(path); 35115d4f98a2SYan Zheng return ret; 35125d4f98a2SYan Zheng } 35135d4f98a2SYan Zheng 35145d4f98a2SYan Zheng /* 35155d4f98a2SYan Zheng * helper to create inode for data relocation. 35165d4f98a2SYan Zheng * the inode is in data relocation tree and its link count is 0 35175d4f98a2SYan Zheng */ 35183fd0a558SYan, Zheng static noinline_for_stack 35193fd0a558SYan, Zheng struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, 352032da5386SDavid Sterba struct btrfs_block_group *group) 35215d4f98a2SYan Zheng { 35225d4f98a2SYan Zheng struct inode *inode = NULL; 35235d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 35245d4f98a2SYan Zheng struct btrfs_root *root; 35255d4f98a2SYan Zheng struct btrfs_key key; 35264624900dSZhaolei u64 objectid; 35275d4f98a2SYan Zheng int err = 0; 35285d4f98a2SYan Zheng 35295d4f98a2SYan Zheng root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); 35305d4f98a2SYan Zheng if (IS_ERR(root)) 35315d4f98a2SYan Zheng return ERR_CAST(root); 35325d4f98a2SYan Zheng 3533a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 353476deacf0SJosef Bacik if (IS_ERR(trans)) { 353500246528SJosef Bacik btrfs_put_root(root); 35363fd0a558SYan, Zheng return ERR_CAST(trans); 353776deacf0SJosef Bacik } 35385d4f98a2SYan Zheng 3539581bb050SLi Zefan err = btrfs_find_free_objectid(root, &objectid); 35405d4f98a2SYan Zheng if (err) 35415d4f98a2SYan Zheng goto out; 35425d4f98a2SYan Zheng 35430257bb82SYan, Zheng err = __insert_orphan_inode(trans, root, objectid); 35445d4f98a2SYan Zheng BUG_ON(err); 35455d4f98a2SYan Zheng 35465d4f98a2SYan Zheng key.objectid = objectid; 35475d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 35485d4f98a2SYan Zheng key.offset = 0; 35494c66e0d4SDavid Sterba inode = btrfs_iget(fs_info->sb, &key, root); 35502e19f1f9SAl Viro BUG_ON(IS_ERR(inode)); 3551b3470b5dSDavid Sterba BTRFS_I(inode)->index_cnt = group->start; 35525d4f98a2SYan Zheng 355373f2e545SNikolay Borisov err = btrfs_orphan_add(trans, BTRFS_I(inode)); 35545d4f98a2SYan Zheng out: 355500246528SJosef Bacik btrfs_put_root(root); 35563a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35572ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 35585d4f98a2SYan Zheng if (err) { 35595d4f98a2SYan Zheng if (inode) 35605d4f98a2SYan Zheng iput(inode); 35615d4f98a2SYan Zheng inode = ERR_PTR(err); 35625d4f98a2SYan Zheng } 35635d4f98a2SYan Zheng return inode; 35645d4f98a2SYan Zheng } 35655d4f98a2SYan Zheng 3566c258d6e3SQu Wenruo static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) 35673fd0a558SYan, Zheng { 35683fd0a558SYan, Zheng struct reloc_control *rc; 35693fd0a558SYan, Zheng 35703fd0a558SYan, Zheng rc = kzalloc(sizeof(*rc), GFP_NOFS); 35713fd0a558SYan, Zheng if (!rc) 35723fd0a558SYan, Zheng return NULL; 35733fd0a558SYan, Zheng 35743fd0a558SYan, Zheng INIT_LIST_HEAD(&rc->reloc_roots); 3575d2311e69SQu Wenruo INIT_LIST_HEAD(&rc->dirty_subvol_roots); 3576584fb121SQu Wenruo btrfs_backref_init_cache(fs_info, &rc->backref_cache, 1); 35773fd0a558SYan, Zheng mapping_tree_init(&rc->reloc_root_tree); 357843eb5f29SQu Wenruo extent_io_tree_init(fs_info, &rc->processed_blocks, 357943eb5f29SQu Wenruo IO_TREE_RELOC_BLOCKS, NULL); 35803fd0a558SYan, Zheng return rc; 35813fd0a558SYan, Zheng } 35823fd0a558SYan, Zheng 35831a0afa0eSJosef Bacik static void free_reloc_control(struct reloc_control *rc) 35841a0afa0eSJosef Bacik { 35851a0afa0eSJosef Bacik struct mapping_node *node, *tmp; 35861a0afa0eSJosef Bacik 35871a0afa0eSJosef Bacik free_reloc_roots(&rc->reloc_roots); 35881a0afa0eSJosef Bacik rbtree_postorder_for_each_entry_safe(node, tmp, 35891a0afa0eSJosef Bacik &rc->reloc_root_tree.rb_root, rb_node) 35901a0afa0eSJosef Bacik kfree(node); 35911a0afa0eSJosef Bacik 35921a0afa0eSJosef Bacik kfree(rc); 35931a0afa0eSJosef Bacik } 35941a0afa0eSJosef Bacik 35955d4f98a2SYan Zheng /* 3596ebce0e01SAdam Borowski * Print the block group being relocated 3597ebce0e01SAdam Borowski */ 3598ebce0e01SAdam Borowski static void describe_relocation(struct btrfs_fs_info *fs_info, 359932da5386SDavid Sterba struct btrfs_block_group *block_group) 3600ebce0e01SAdam Borowski { 3601f89e09cfSAnand Jain char buf[128] = {'\0'}; 3602ebce0e01SAdam Borowski 3603f89e09cfSAnand Jain btrfs_describe_block_groups(block_group->flags, buf, sizeof(buf)); 3604ebce0e01SAdam Borowski 3605ebce0e01SAdam Borowski btrfs_info(fs_info, 3606ebce0e01SAdam Borowski "relocating block group %llu flags %s", 3607b3470b5dSDavid Sterba block_group->start, buf); 3608ebce0e01SAdam Borowski } 3609ebce0e01SAdam Borowski 3610430640e3SQu Wenruo static const char *stage_to_string(int stage) 3611430640e3SQu Wenruo { 3612430640e3SQu Wenruo if (stage == MOVE_DATA_EXTENTS) 3613430640e3SQu Wenruo return "move data extents"; 3614430640e3SQu Wenruo if (stage == UPDATE_DATA_PTRS) 3615430640e3SQu Wenruo return "update data pointers"; 3616430640e3SQu Wenruo return "unknown"; 3617430640e3SQu Wenruo } 3618430640e3SQu Wenruo 3619ebce0e01SAdam Borowski /* 36205d4f98a2SYan Zheng * function to relocate all extents in a block group. 36215d4f98a2SYan Zheng */ 36226bccf3abSJeff Mahoney int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start) 36235d4f98a2SYan Zheng { 362432da5386SDavid Sterba struct btrfs_block_group *bg; 36256bccf3abSJeff Mahoney struct btrfs_root *extent_root = fs_info->extent_root; 36265d4f98a2SYan Zheng struct reloc_control *rc; 36270af3d00bSJosef Bacik struct inode *inode; 36280af3d00bSJosef Bacik struct btrfs_path *path; 36295d4f98a2SYan Zheng int ret; 3630f0486c68SYan, Zheng int rw = 0; 36315d4f98a2SYan Zheng int err = 0; 36325d4f98a2SYan Zheng 3633eede2bf3SOmar Sandoval bg = btrfs_lookup_block_group(fs_info, group_start); 3634eede2bf3SOmar Sandoval if (!bg) 3635eede2bf3SOmar Sandoval return -ENOENT; 3636eede2bf3SOmar Sandoval 3637eede2bf3SOmar Sandoval if (btrfs_pinned_by_swapfile(fs_info, bg)) { 3638eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 3639eede2bf3SOmar Sandoval return -ETXTBSY; 3640eede2bf3SOmar Sandoval } 3641eede2bf3SOmar Sandoval 3642c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 3643eede2bf3SOmar Sandoval if (!rc) { 3644eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 36455d4f98a2SYan Zheng return -ENOMEM; 3646eede2bf3SOmar Sandoval } 36475d4f98a2SYan Zheng 3648f0486c68SYan, Zheng rc->extent_root = extent_root; 3649eede2bf3SOmar Sandoval rc->block_group = bg; 36505d4f98a2SYan Zheng 3651b12de528SQu Wenruo ret = btrfs_inc_block_group_ro(rc->block_group, true); 3652f0486c68SYan, Zheng if (ret) { 3653f0486c68SYan, Zheng err = ret; 3654f0486c68SYan, Zheng goto out; 3655f0486c68SYan, Zheng } 3656f0486c68SYan, Zheng rw = 1; 3657f0486c68SYan, Zheng 36580af3d00bSJosef Bacik path = btrfs_alloc_path(); 36590af3d00bSJosef Bacik if (!path) { 36600af3d00bSJosef Bacik err = -ENOMEM; 36610af3d00bSJosef Bacik goto out; 36620af3d00bSJosef Bacik } 36630af3d00bSJosef Bacik 36647949f339SDavid Sterba inode = lookup_free_space_inode(rc->block_group, path); 36650af3d00bSJosef Bacik btrfs_free_path(path); 36660af3d00bSJosef Bacik 36670af3d00bSJosef Bacik if (!IS_ERR(inode)) 36681bbc621eSChris Mason ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0); 36690af3d00bSJosef Bacik else 36700af3d00bSJosef Bacik ret = PTR_ERR(inode); 36710af3d00bSJosef Bacik 36720af3d00bSJosef Bacik if (ret && ret != -ENOENT) { 36730af3d00bSJosef Bacik err = ret; 36740af3d00bSJosef Bacik goto out; 36750af3d00bSJosef Bacik } 36760af3d00bSJosef Bacik 36775d4f98a2SYan Zheng rc->data_inode = create_reloc_inode(fs_info, rc->block_group); 36785d4f98a2SYan Zheng if (IS_ERR(rc->data_inode)) { 36795d4f98a2SYan Zheng err = PTR_ERR(rc->data_inode); 36805d4f98a2SYan Zheng rc->data_inode = NULL; 36815d4f98a2SYan Zheng goto out; 36825d4f98a2SYan Zheng } 36835d4f98a2SYan Zheng 36840b246afaSJeff Mahoney describe_relocation(fs_info, rc->block_group); 36855d4f98a2SYan Zheng 36869cfa3e34SFilipe Manana btrfs_wait_block_group_reservations(rc->block_group); 3687f78c436cSFilipe Manana btrfs_wait_nocow_writers(rc->block_group); 36886374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 3689b3470b5dSDavid Sterba rc->block_group->start, 3690b3470b5dSDavid Sterba rc->block_group->length); 36915d4f98a2SYan Zheng 36925d4f98a2SYan Zheng while (1) { 3693430640e3SQu Wenruo int finishes_stage; 3694430640e3SQu Wenruo 369576dda93cSYan, Zheng mutex_lock(&fs_info->cleaner_mutex); 36965d4f98a2SYan Zheng ret = relocate_block_group(rc); 369776dda93cSYan, Zheng mutex_unlock(&fs_info->cleaner_mutex); 3698ff612ba7SJosef Bacik if (ret < 0) 36995d4f98a2SYan Zheng err = ret; 3700ff612ba7SJosef Bacik 3701430640e3SQu Wenruo finishes_stage = rc->stage; 3702ff612ba7SJosef Bacik /* 3703ff612ba7SJosef Bacik * We may have gotten ENOSPC after we already dirtied some 3704ff612ba7SJosef Bacik * extents. If writeout happens while we're relocating a 3705ff612ba7SJosef Bacik * different block group we could end up hitting the 3706ff612ba7SJosef Bacik * BUG_ON(rc->stage == UPDATE_DATA_PTRS) in 3707ff612ba7SJosef Bacik * btrfs_reloc_cow_block. Make sure we write everything out 3708ff612ba7SJosef Bacik * properly so we don't trip over this problem, and then break 3709ff612ba7SJosef Bacik * out of the loop if we hit an error. 3710ff612ba7SJosef Bacik */ 3711ff612ba7SJosef Bacik if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { 3712ff612ba7SJosef Bacik ret = btrfs_wait_ordered_range(rc->data_inode, 0, 3713ff612ba7SJosef Bacik (u64)-1); 3714ff612ba7SJosef Bacik if (ret) 3715ff612ba7SJosef Bacik err = ret; 3716ff612ba7SJosef Bacik invalidate_mapping_pages(rc->data_inode->i_mapping, 3717ff612ba7SJosef Bacik 0, -1); 3718ff612ba7SJosef Bacik rc->stage = UPDATE_DATA_PTRS; 37195d4f98a2SYan Zheng } 37205d4f98a2SYan Zheng 3721ff612ba7SJosef Bacik if (err < 0) 3722ff612ba7SJosef Bacik goto out; 3723ff612ba7SJosef Bacik 37245d4f98a2SYan Zheng if (rc->extents_found == 0) 37255d4f98a2SYan Zheng break; 37265d4f98a2SYan Zheng 3727430640e3SQu Wenruo btrfs_info(fs_info, "found %llu extents, stage: %s", 3728430640e3SQu Wenruo rc->extents_found, stage_to_string(finishes_stage)); 37295d4f98a2SYan Zheng } 37305d4f98a2SYan Zheng 37315d4f98a2SYan Zheng WARN_ON(rc->block_group->pinned > 0); 37325d4f98a2SYan Zheng WARN_ON(rc->block_group->reserved > 0); 3733bf38be65SDavid Sterba WARN_ON(rc->block_group->used > 0); 37345d4f98a2SYan Zheng out: 3735f0486c68SYan, Zheng if (err && rw) 37362ff7e61eSJeff Mahoney btrfs_dec_block_group_ro(rc->block_group); 37375d4f98a2SYan Zheng iput(rc->data_inode); 37385d4f98a2SYan Zheng btrfs_put_block_group(rc->block_group); 37391a0afa0eSJosef Bacik free_reloc_control(rc); 37405d4f98a2SYan Zheng return err; 37415d4f98a2SYan Zheng } 37425d4f98a2SYan Zheng 374376dda93cSYan, Zheng static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) 374476dda93cSYan, Zheng { 37450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 374676dda93cSYan, Zheng struct btrfs_trans_handle *trans; 374779787eaaSJeff Mahoney int ret, err; 374876dda93cSYan, Zheng 37490b246afaSJeff Mahoney trans = btrfs_start_transaction(fs_info->tree_root, 0); 375079787eaaSJeff Mahoney if (IS_ERR(trans)) 375179787eaaSJeff Mahoney return PTR_ERR(trans); 375276dda93cSYan, Zheng 375376dda93cSYan, Zheng memset(&root->root_item.drop_progress, 0, 375476dda93cSYan, Zheng sizeof(root->root_item.drop_progress)); 375576dda93cSYan, Zheng root->root_item.drop_level = 0; 375676dda93cSYan, Zheng btrfs_set_root_refs(&root->root_item, 0); 37570b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 375876dda93cSYan, Zheng &root->root_key, &root->root_item); 375976dda93cSYan, Zheng 37603a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 376179787eaaSJeff Mahoney if (err) 376279787eaaSJeff Mahoney return err; 376379787eaaSJeff Mahoney return ret; 376476dda93cSYan, Zheng } 376576dda93cSYan, Zheng 37665d4f98a2SYan Zheng /* 37675d4f98a2SYan Zheng * recover relocation interrupted by system crash. 37685d4f98a2SYan Zheng * 37695d4f98a2SYan Zheng * this function resumes merging reloc trees with corresponding fs trees. 37705d4f98a2SYan Zheng * this is important for keeping the sharing of tree blocks 37715d4f98a2SYan Zheng */ 37725d4f98a2SYan Zheng int btrfs_recover_relocation(struct btrfs_root *root) 37735d4f98a2SYan Zheng { 37740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 37755d4f98a2SYan Zheng LIST_HEAD(reloc_roots); 37765d4f98a2SYan Zheng struct btrfs_key key; 37775d4f98a2SYan Zheng struct btrfs_root *fs_root; 37785d4f98a2SYan Zheng struct btrfs_root *reloc_root; 37795d4f98a2SYan Zheng struct btrfs_path *path; 37805d4f98a2SYan Zheng struct extent_buffer *leaf; 37815d4f98a2SYan Zheng struct reloc_control *rc = NULL; 37825d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 37835d4f98a2SYan Zheng int ret; 37845d4f98a2SYan Zheng int err = 0; 37855d4f98a2SYan Zheng 37865d4f98a2SYan Zheng path = btrfs_alloc_path(); 37875d4f98a2SYan Zheng if (!path) 37885d4f98a2SYan Zheng return -ENOMEM; 3789e4058b54SDavid Sterba path->reada = READA_BACK; 37905d4f98a2SYan Zheng 37915d4f98a2SYan Zheng key.objectid = BTRFS_TREE_RELOC_OBJECTID; 37925d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 37935d4f98a2SYan Zheng key.offset = (u64)-1; 37945d4f98a2SYan Zheng 37955d4f98a2SYan Zheng while (1) { 37960b246afaSJeff Mahoney ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, 37975d4f98a2SYan Zheng path, 0, 0); 37985d4f98a2SYan Zheng if (ret < 0) { 37995d4f98a2SYan Zheng err = ret; 38005d4f98a2SYan Zheng goto out; 38015d4f98a2SYan Zheng } 38025d4f98a2SYan Zheng if (ret > 0) { 38035d4f98a2SYan Zheng if (path->slots[0] == 0) 38045d4f98a2SYan Zheng break; 38055d4f98a2SYan Zheng path->slots[0]--; 38065d4f98a2SYan Zheng } 38075d4f98a2SYan Zheng leaf = path->nodes[0]; 38085d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 3809b3b4aa74SDavid Sterba btrfs_release_path(path); 38105d4f98a2SYan Zheng 38115d4f98a2SYan Zheng if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || 38125d4f98a2SYan Zheng key.type != BTRFS_ROOT_ITEM_KEY) 38135d4f98a2SYan Zheng break; 38145d4f98a2SYan Zheng 38153dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(root, &key); 38165d4f98a2SYan Zheng if (IS_ERR(reloc_root)) { 38175d4f98a2SYan Zheng err = PTR_ERR(reloc_root); 38185d4f98a2SYan Zheng goto out; 38195d4f98a2SYan Zheng } 38205d4f98a2SYan Zheng 38213dbf1738SJosef Bacik set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state); 38225d4f98a2SYan Zheng list_add(&reloc_root->root_list, &reloc_roots); 38235d4f98a2SYan Zheng 38245d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 38250b246afaSJeff Mahoney fs_root = read_fs_root(fs_info, 38265d4f98a2SYan Zheng reloc_root->root_key.offset); 38275d4f98a2SYan Zheng if (IS_ERR(fs_root)) { 382876dda93cSYan, Zheng ret = PTR_ERR(fs_root); 382976dda93cSYan, Zheng if (ret != -ENOENT) { 383076dda93cSYan, Zheng err = ret; 38315d4f98a2SYan Zheng goto out; 38325d4f98a2SYan Zheng } 383379787eaaSJeff Mahoney ret = mark_garbage_root(reloc_root); 383479787eaaSJeff Mahoney if (ret < 0) { 383579787eaaSJeff Mahoney err = ret; 383679787eaaSJeff Mahoney goto out; 383779787eaaSJeff Mahoney } 3838932fd26dSJosef Bacik } else { 383900246528SJosef Bacik btrfs_put_root(fs_root); 384076dda93cSYan, Zheng } 38415d4f98a2SYan Zheng } 38425d4f98a2SYan Zheng 38435d4f98a2SYan Zheng if (key.offset == 0) 38445d4f98a2SYan Zheng break; 38455d4f98a2SYan Zheng 38465d4f98a2SYan Zheng key.offset--; 38475d4f98a2SYan Zheng } 3848b3b4aa74SDavid Sterba btrfs_release_path(path); 38495d4f98a2SYan Zheng 38505d4f98a2SYan Zheng if (list_empty(&reloc_roots)) 38515d4f98a2SYan Zheng goto out; 38525d4f98a2SYan Zheng 3853c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 38545d4f98a2SYan Zheng if (!rc) { 38555d4f98a2SYan Zheng err = -ENOMEM; 38565d4f98a2SYan Zheng goto out; 38575d4f98a2SYan Zheng } 38585d4f98a2SYan Zheng 38590b246afaSJeff Mahoney rc->extent_root = fs_info->extent_root; 38605d4f98a2SYan Zheng 38615d4f98a2SYan Zheng set_reloc_control(rc); 38625d4f98a2SYan Zheng 38637a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 38643612b495STsutomu Itoh if (IS_ERR(trans)) { 38653612b495STsutomu Itoh err = PTR_ERR(trans); 3866fb2d83eeSJosef Bacik goto out_unset; 38673612b495STsutomu Itoh } 38683fd0a558SYan, Zheng 38693fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 38703fd0a558SYan, Zheng 38715d4f98a2SYan Zheng while (!list_empty(&reloc_roots)) { 38725d4f98a2SYan Zheng reloc_root = list_entry(reloc_roots.next, 38735d4f98a2SYan Zheng struct btrfs_root, root_list); 38745d4f98a2SYan Zheng list_del(&reloc_root->root_list); 38755d4f98a2SYan Zheng 38765d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) == 0) { 38775d4f98a2SYan Zheng list_add_tail(&reloc_root->root_list, 38785d4f98a2SYan Zheng &rc->reloc_roots); 38795d4f98a2SYan Zheng continue; 38805d4f98a2SYan Zheng } 38815d4f98a2SYan Zheng 38820b246afaSJeff Mahoney fs_root = read_fs_root(fs_info, reloc_root->root_key.offset); 388379787eaaSJeff Mahoney if (IS_ERR(fs_root)) { 388479787eaaSJeff Mahoney err = PTR_ERR(fs_root); 3885ca1aa281SJosef Bacik list_add_tail(&reloc_root->root_list, &reloc_roots); 38861402d17dSXiyu Yang btrfs_end_transaction(trans); 3887fb2d83eeSJosef Bacik goto out_unset; 388879787eaaSJeff Mahoney } 38895d4f98a2SYan Zheng 3890ffd7b339SJeff Mahoney err = __add_reloc_root(reloc_root); 389179787eaaSJeff Mahoney BUG_ON(err < 0); /* -ENOMEM or logic error */ 3892f44deb74SJosef Bacik fs_root->reloc_root = btrfs_grab_root(reloc_root); 389300246528SJosef Bacik btrfs_put_root(fs_root); 38945d4f98a2SYan Zheng } 38955d4f98a2SYan Zheng 38963a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 389779787eaaSJeff Mahoney if (err) 3898fb2d83eeSJosef Bacik goto out_unset; 38995d4f98a2SYan Zheng 39005d4f98a2SYan Zheng merge_reloc_roots(rc); 39015d4f98a2SYan Zheng 39025d4f98a2SYan Zheng unset_reloc_control(rc); 39035d4f98a2SYan Zheng 39047a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 390562b99540SQu Wenruo if (IS_ERR(trans)) { 39063612b495STsutomu Itoh err = PTR_ERR(trans); 39076217b0faSJosef Bacik goto out_clean; 390862b99540SQu Wenruo } 39093a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 39106217b0faSJosef Bacik out_clean: 3911d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3912d2311e69SQu Wenruo if (ret < 0 && !err) 3913d2311e69SQu Wenruo err = ret; 3914fb2d83eeSJosef Bacik out_unset: 3915fb2d83eeSJosef Bacik unset_reloc_control(rc); 39161a0afa0eSJosef Bacik free_reloc_control(rc); 39173612b495STsutomu Itoh out: 3918aca1bba6SLiu Bo if (!list_empty(&reloc_roots)) 3919aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 3920aca1bba6SLiu Bo 39215d4f98a2SYan Zheng btrfs_free_path(path); 39225d4f98a2SYan Zheng 39235d4f98a2SYan Zheng if (err == 0) { 39245d4f98a2SYan Zheng /* cleanup orphan inode in data relocation tree */ 39250b246afaSJeff Mahoney fs_root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); 3926932fd26dSJosef Bacik if (IS_ERR(fs_root)) { 39275d4f98a2SYan Zheng err = PTR_ERR(fs_root); 3928932fd26dSJosef Bacik } else { 392966b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_root); 393000246528SJosef Bacik btrfs_put_root(fs_root); 3931932fd26dSJosef Bacik } 3932932fd26dSJosef Bacik } 39335d4f98a2SYan Zheng return err; 39345d4f98a2SYan Zheng } 39355d4f98a2SYan Zheng 39365d4f98a2SYan Zheng /* 39375d4f98a2SYan Zheng * helper to add ordered checksum for data relocation. 39385d4f98a2SYan Zheng * 39395d4f98a2SYan Zheng * cloning checksum properly handles the nodatasum extents. 39405d4f98a2SYan Zheng * it also saves CPU time to re-calculate the checksum. 39415d4f98a2SYan Zheng */ 39425d4f98a2SYan Zheng int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) 39435d4f98a2SYan Zheng { 39440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39455d4f98a2SYan Zheng struct btrfs_ordered_sum *sums; 39465d4f98a2SYan Zheng struct btrfs_ordered_extent *ordered; 39475d4f98a2SYan Zheng int ret; 39485d4f98a2SYan Zheng u64 disk_bytenr; 39494577b014SJosef Bacik u64 new_bytenr; 39505d4f98a2SYan Zheng LIST_HEAD(list); 39515d4f98a2SYan Zheng 39525d4f98a2SYan Zheng ordered = btrfs_lookup_ordered_extent(inode, file_pos); 3953bffe633eSOmar Sandoval BUG_ON(ordered->file_offset != file_pos || ordered->num_bytes != len); 39545d4f98a2SYan Zheng 39555d4f98a2SYan Zheng disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; 39560b246afaSJeff Mahoney ret = btrfs_lookup_csums_range(fs_info->csum_root, disk_bytenr, 3957a2de733cSArne Jansen disk_bytenr + len - 1, &list, 0); 395879787eaaSJeff Mahoney if (ret) 395979787eaaSJeff Mahoney goto out; 39605d4f98a2SYan Zheng 39615d4f98a2SYan Zheng while (!list_empty(&list)) { 39625d4f98a2SYan Zheng sums = list_entry(list.next, struct btrfs_ordered_sum, list); 39635d4f98a2SYan Zheng list_del_init(&sums->list); 39645d4f98a2SYan Zheng 39654577b014SJosef Bacik /* 39664577b014SJosef Bacik * We need to offset the new_bytenr based on where the csum is. 39674577b014SJosef Bacik * We need to do this because we will read in entire prealloc 39684577b014SJosef Bacik * extents but we may have written to say the middle of the 39694577b014SJosef Bacik * prealloc extent, so we need to make sure the csum goes with 39704577b014SJosef Bacik * the right disk offset. 39714577b014SJosef Bacik * 39724577b014SJosef Bacik * We can do this because the data reloc inode refers strictly 39734577b014SJosef Bacik * to the on disk bytes, so we don't have to worry about 39744577b014SJosef Bacik * disk_len vs real len like with real inodes since it's all 39754577b014SJosef Bacik * disk length. 39764577b014SJosef Bacik */ 3977bffe633eSOmar Sandoval new_bytenr = ordered->disk_bytenr + sums->bytenr - disk_bytenr; 39784577b014SJosef Bacik sums->bytenr = new_bytenr; 39795d4f98a2SYan Zheng 3980f9756261SNikolay Borisov btrfs_add_ordered_sum(ordered, sums); 39815d4f98a2SYan Zheng } 398279787eaaSJeff Mahoney out: 39835d4f98a2SYan Zheng btrfs_put_ordered_extent(ordered); 3984411fc6bcSAndi Kleen return ret; 39855d4f98a2SYan Zheng } 39863fd0a558SYan, Zheng 398783d4cfd4SJosef Bacik int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 39883fd0a558SYan, Zheng struct btrfs_root *root, struct extent_buffer *buf, 39893fd0a558SYan, Zheng struct extent_buffer *cow) 39903fd0a558SYan, Zheng { 39910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 39923fd0a558SYan, Zheng struct reloc_control *rc; 3993a26195a5SQu Wenruo struct btrfs_backref_node *node; 39943fd0a558SYan, Zheng int first_cow = 0; 39953fd0a558SYan, Zheng int level; 399683d4cfd4SJosef Bacik int ret = 0; 39973fd0a558SYan, Zheng 39980b246afaSJeff Mahoney rc = fs_info->reloc_ctl; 39993fd0a558SYan, Zheng if (!rc) 400083d4cfd4SJosef Bacik return 0; 40013fd0a558SYan, Zheng 40023fd0a558SYan, Zheng BUG_ON(rc->stage == UPDATE_DATA_PTRS && 40033fd0a558SYan, Zheng root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); 40043fd0a558SYan, Zheng 40053fd0a558SYan, Zheng level = btrfs_header_level(buf); 40063fd0a558SYan, Zheng if (btrfs_header_generation(buf) <= 40073fd0a558SYan, Zheng btrfs_root_last_snapshot(&root->root_item)) 40083fd0a558SYan, Zheng first_cow = 1; 40093fd0a558SYan, Zheng 40103fd0a558SYan, Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && 40113fd0a558SYan, Zheng rc->create_reloc_tree) { 40123fd0a558SYan, Zheng WARN_ON(!first_cow && level == 0); 40133fd0a558SYan, Zheng 40143fd0a558SYan, Zheng node = rc->backref_cache.path[level]; 40153fd0a558SYan, Zheng BUG_ON(node->bytenr != buf->start && 40163fd0a558SYan, Zheng node->new_bytenr != buf->start); 40173fd0a558SYan, Zheng 4018b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 401967439dadSDavid Sterba atomic_inc(&cow->refs); 40203fd0a558SYan, Zheng node->eb = cow; 40213fd0a558SYan, Zheng node->new_bytenr = cow->start; 40223fd0a558SYan, Zheng 40233fd0a558SYan, Zheng if (!node->pending) { 40243fd0a558SYan, Zheng list_move_tail(&node->list, 40253fd0a558SYan, Zheng &rc->backref_cache.pending[level]); 40263fd0a558SYan, Zheng node->pending = 1; 40273fd0a558SYan, Zheng } 40283fd0a558SYan, Zheng 40293fd0a558SYan, Zheng if (first_cow) 40309569cc20SQu Wenruo mark_block_processed(rc, node); 40313fd0a558SYan, Zheng 40323fd0a558SYan, Zheng if (first_cow && level > 0) 40333fd0a558SYan, Zheng rc->nodes_relocated += buf->len; 40343fd0a558SYan, Zheng } 40353fd0a558SYan, Zheng 403683d4cfd4SJosef Bacik if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) 40373fd0a558SYan, Zheng ret = replace_file_extents(trans, rc, root, cow); 403883d4cfd4SJosef Bacik return ret; 40393fd0a558SYan, Zheng } 40403fd0a558SYan, Zheng 40413fd0a558SYan, Zheng /* 40423fd0a558SYan, Zheng * called before creating snapshot. it calculates metadata reservation 404301327610SNicholas D Steeves * required for relocating tree blocks in the snapshot 40443fd0a558SYan, Zheng */ 4045147d256eSZhaolei void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 40463fd0a558SYan, Zheng u64 *bytes_to_reserve) 40473fd0a558SYan, Zheng { 404810995c04SQu Wenruo struct btrfs_root *root = pending->root; 404910995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 40503fd0a558SYan, Zheng 40516282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 40523fd0a558SYan, Zheng return; 40533fd0a558SYan, Zheng 40543fd0a558SYan, Zheng if (!rc->merge_reloc_tree) 40553fd0a558SYan, Zheng return; 40563fd0a558SYan, Zheng 40573fd0a558SYan, Zheng root = root->reloc_root; 40583fd0a558SYan, Zheng BUG_ON(btrfs_root_refs(&root->root_item) == 0); 40593fd0a558SYan, Zheng /* 40603fd0a558SYan, Zheng * relocation is in the stage of merging trees. the space 40613fd0a558SYan, Zheng * used by merging a reloc tree is twice the size of 40623fd0a558SYan, Zheng * relocated tree nodes in the worst case. half for cowing 40633fd0a558SYan, Zheng * the reloc tree, half for cowing the fs tree. the space 40643fd0a558SYan, Zheng * used by cowing the reloc tree will be freed after the 40653fd0a558SYan, Zheng * tree is dropped. if we create snapshot, cowing the fs 40663fd0a558SYan, Zheng * tree may use more space than it frees. so we need 40673fd0a558SYan, Zheng * reserve extra space. 40683fd0a558SYan, Zheng */ 40693fd0a558SYan, Zheng *bytes_to_reserve += rc->nodes_relocated; 40703fd0a558SYan, Zheng } 40713fd0a558SYan, Zheng 40723fd0a558SYan, Zheng /* 40733fd0a558SYan, Zheng * called after snapshot is created. migrate block reservation 40743fd0a558SYan, Zheng * and create reloc root for the newly created snapshot 4075f44deb74SJosef Bacik * 4076f44deb74SJosef Bacik * This is similar to btrfs_init_reloc_root(), we come out of here with two 4077f44deb74SJosef Bacik * references held on the reloc_root, one for root->reloc_root and one for 4078f44deb74SJosef Bacik * rc->reloc_roots. 40793fd0a558SYan, Zheng */ 408049b25e05SJeff Mahoney int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 40813fd0a558SYan, Zheng struct btrfs_pending_snapshot *pending) 40823fd0a558SYan, Zheng { 40833fd0a558SYan, Zheng struct btrfs_root *root = pending->root; 40843fd0a558SYan, Zheng struct btrfs_root *reloc_root; 40853fd0a558SYan, Zheng struct btrfs_root *new_root; 408610995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 40873fd0a558SYan, Zheng int ret; 40883fd0a558SYan, Zheng 40896282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 409049b25e05SJeff Mahoney return 0; 40913fd0a558SYan, Zheng 40923fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 40933fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated; 40943fd0a558SYan, Zheng 40953fd0a558SYan, Zheng if (rc->merge_reloc_tree) { 40963fd0a558SYan, Zheng ret = btrfs_block_rsv_migrate(&pending->block_rsv, 40973fd0a558SYan, Zheng rc->block_rsv, 40983a584174SLu Fengqi rc->nodes_relocated, true); 409949b25e05SJeff Mahoney if (ret) 410049b25e05SJeff Mahoney return ret; 41013fd0a558SYan, Zheng } 41023fd0a558SYan, Zheng 41033fd0a558SYan, Zheng new_root = pending->snap; 41043fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root->reloc_root, 41053fd0a558SYan, Zheng new_root->root_key.objectid); 410649b25e05SJeff Mahoney if (IS_ERR(reloc_root)) 410749b25e05SJeff Mahoney return PTR_ERR(reloc_root); 41083fd0a558SYan, Zheng 4109ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 4110ffd7b339SJeff Mahoney BUG_ON(ret < 0); 4111f44deb74SJosef Bacik new_root->reloc_root = btrfs_grab_root(reloc_root); 41123fd0a558SYan, Zheng 411349b25e05SJeff Mahoney if (rc->create_reloc_tree) 41143fd0a558SYan, Zheng ret = clone_backref_node(trans, rc, root, reloc_root); 411549b25e05SJeff Mahoney return ret; 41163fd0a558SYan, Zheng } 4117