1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 25d4f98a2SYan Zheng /* 35d4f98a2SYan Zheng * Copyright (C) 2009 Oracle. All rights reserved. 45d4f98a2SYan Zheng */ 55d4f98a2SYan Zheng 65d4f98a2SYan Zheng #include <linux/sched.h> 75d4f98a2SYan Zheng #include <linux/pagemap.h> 85d4f98a2SYan Zheng #include <linux/writeback.h> 95d4f98a2SYan Zheng #include <linux/blkdev.h> 105d4f98a2SYan Zheng #include <linux/rbtree.h> 115a0e3ad6STejun Heo #include <linux/slab.h> 12726a3421SQu Wenruo #include <linux/error-injection.h> 135d4f98a2SYan Zheng #include "ctree.h" 145d4f98a2SYan Zheng #include "disk-io.h" 155d4f98a2SYan Zheng #include "transaction.h" 165d4f98a2SYan Zheng #include "volumes.h" 175d4f98a2SYan Zheng #include "locking.h" 185d4f98a2SYan Zheng #include "btrfs_inode.h" 195d4f98a2SYan Zheng #include "async-thread.h" 200af3d00bSJosef Bacik #include "free-space-cache.h" 21581bb050SLi Zefan #include "inode-map.h" 2262b99540SQu Wenruo #include "qgroup.h" 23cdccee99SLiu Bo #include "print-tree.h" 2486736342SJosef Bacik #include "delalloc-space.h" 25aac0023cSJosef Bacik #include "block-group.h" 2619b546d7SQu Wenruo #include "backref.h" 27e9a28dc5SQu Wenruo #include "misc.h" 285d4f98a2SYan Zheng 295d4f98a2SYan Zheng /* 300c891389SQu Wenruo * Relocation overview 310c891389SQu Wenruo * 320c891389SQu Wenruo * [What does relocation do] 330c891389SQu Wenruo * 340c891389SQu Wenruo * The objective of relocation is to relocate all extents of the target block 350c891389SQu Wenruo * group to other block groups. 360c891389SQu Wenruo * This is utilized by resize (shrink only), profile converting, compacting 370c891389SQu Wenruo * space, or balance routine to spread chunks over devices. 380c891389SQu Wenruo * 390c891389SQu Wenruo * Before | After 400c891389SQu Wenruo * ------------------------------------------------------------------ 410c891389SQu Wenruo * BG A: 10 data extents | BG A: deleted 420c891389SQu Wenruo * BG B: 2 data extents | BG B: 10 data extents (2 old + 8 relocated) 430c891389SQu Wenruo * BG C: 1 extents | BG C: 3 data extents (1 old + 2 relocated) 440c891389SQu Wenruo * 450c891389SQu Wenruo * [How does relocation work] 460c891389SQu Wenruo * 470c891389SQu Wenruo * 1. Mark the target block group read-only 480c891389SQu Wenruo * New extents won't be allocated from the target block group. 490c891389SQu Wenruo * 500c891389SQu Wenruo * 2.1 Record each extent in the target block group 510c891389SQu Wenruo * To build a proper map of extents to be relocated. 520c891389SQu Wenruo * 530c891389SQu Wenruo * 2.2 Build data reloc tree and reloc trees 540c891389SQu Wenruo * Data reloc tree will contain an inode, recording all newly relocated 550c891389SQu Wenruo * data extents. 560c891389SQu Wenruo * There will be only one data reloc tree for one data block group. 570c891389SQu Wenruo * 580c891389SQu Wenruo * Reloc tree will be a special snapshot of its source tree, containing 590c891389SQu Wenruo * relocated tree blocks. 600c891389SQu Wenruo * Each tree referring to a tree block in target block group will get its 610c891389SQu Wenruo * reloc tree built. 620c891389SQu Wenruo * 630c891389SQu Wenruo * 2.3 Swap source tree with its corresponding reloc tree 640c891389SQu Wenruo * Each involved tree only refers to new extents after swap. 650c891389SQu Wenruo * 660c891389SQu Wenruo * 3. Cleanup reloc trees and data reloc tree. 670c891389SQu Wenruo * As old extents in the target block group are still referenced by reloc 680c891389SQu Wenruo * trees, we need to clean them up before really freeing the target block 690c891389SQu Wenruo * group. 700c891389SQu Wenruo * 710c891389SQu Wenruo * The main complexity is in steps 2.2 and 2.3. 720c891389SQu Wenruo * 730c891389SQu Wenruo * The entry point of relocation is relocate_block_group() function. 740c891389SQu Wenruo */ 750c891389SQu Wenruo 760647bf56SWang Shilong #define RELOCATION_RESERVED_NODES 256 772a979612SQu Wenruo /* 785d4f98a2SYan Zheng * map address of tree root to tree 795d4f98a2SYan Zheng */ 805d4f98a2SYan Zheng struct mapping_node { 81e9a28dc5SQu Wenruo struct { 825d4f98a2SYan Zheng struct rb_node rb_node; 835d4f98a2SYan Zheng u64 bytenr; 84e9a28dc5SQu Wenruo }; /* Use rb_simle_node for search/insert */ 855d4f98a2SYan Zheng void *data; 865d4f98a2SYan Zheng }; 875d4f98a2SYan Zheng 885d4f98a2SYan Zheng struct mapping_tree { 895d4f98a2SYan Zheng struct rb_root rb_root; 905d4f98a2SYan Zheng spinlock_t lock; 915d4f98a2SYan Zheng }; 925d4f98a2SYan Zheng 935d4f98a2SYan Zheng /* 945d4f98a2SYan Zheng * present a tree block to process 955d4f98a2SYan Zheng */ 965d4f98a2SYan Zheng struct tree_block { 97e9a28dc5SQu Wenruo struct { 985d4f98a2SYan Zheng struct rb_node rb_node; 995d4f98a2SYan Zheng u64 bytenr; 100e9a28dc5SQu Wenruo }; /* Use rb_simple_node for search/insert */ 1015d4f98a2SYan Zheng struct btrfs_key key; 1025d4f98a2SYan Zheng unsigned int level:8; 1035d4f98a2SYan Zheng unsigned int key_ready:1; 1045d4f98a2SYan Zheng }; 1055d4f98a2SYan Zheng 1060257bb82SYan, Zheng #define MAX_EXTENTS 128 1070257bb82SYan, Zheng 1080257bb82SYan, Zheng struct file_extent_cluster { 1090257bb82SYan, Zheng u64 start; 1100257bb82SYan, Zheng u64 end; 1110257bb82SYan, Zheng u64 boundary[MAX_EXTENTS]; 1120257bb82SYan, Zheng unsigned int nr; 1130257bb82SYan, Zheng }; 1140257bb82SYan, Zheng 1155d4f98a2SYan Zheng struct reloc_control { 1165d4f98a2SYan Zheng /* block group to relocate */ 11732da5386SDavid Sterba struct btrfs_block_group *block_group; 1185d4f98a2SYan Zheng /* extent tree */ 1195d4f98a2SYan Zheng struct btrfs_root *extent_root; 1205d4f98a2SYan Zheng /* inode for moving data */ 1215d4f98a2SYan Zheng struct inode *data_inode; 1223fd0a558SYan, Zheng 1233fd0a558SYan, Zheng struct btrfs_block_rsv *block_rsv; 1243fd0a558SYan, Zheng 125a26195a5SQu Wenruo struct btrfs_backref_cache backref_cache; 1263fd0a558SYan, Zheng 1273fd0a558SYan, Zheng struct file_extent_cluster cluster; 1285d4f98a2SYan Zheng /* tree blocks have been processed */ 1295d4f98a2SYan Zheng struct extent_io_tree processed_blocks; 1305d4f98a2SYan Zheng /* map start of tree root to corresponding reloc tree */ 1315d4f98a2SYan Zheng struct mapping_tree reloc_root_tree; 1325d4f98a2SYan Zheng /* list of reloc trees */ 1335d4f98a2SYan Zheng struct list_head reloc_roots; 134d2311e69SQu Wenruo /* list of subvolume trees that get relocated */ 135d2311e69SQu Wenruo struct list_head dirty_subvol_roots; 1363fd0a558SYan, Zheng /* size of metadata reservation for merging reloc trees */ 1373fd0a558SYan, Zheng u64 merging_rsv_size; 1383fd0a558SYan, Zheng /* size of relocated tree nodes */ 1393fd0a558SYan, Zheng u64 nodes_relocated; 1400647bf56SWang Shilong /* reserved size for block group relocation*/ 1410647bf56SWang Shilong u64 reserved_bytes; 1423fd0a558SYan, Zheng 1435d4f98a2SYan Zheng u64 search_start; 1445d4f98a2SYan Zheng u64 extents_found; 1453fd0a558SYan, Zheng 1463fd0a558SYan, Zheng unsigned int stage:8; 1473fd0a558SYan, Zheng unsigned int create_reloc_tree:1; 1483fd0a558SYan, Zheng unsigned int merge_reloc_tree:1; 1495d4f98a2SYan Zheng unsigned int found_file_extent:1; 1505d4f98a2SYan Zheng }; 1515d4f98a2SYan Zheng 1525d4f98a2SYan Zheng /* stages of data relocation */ 1535d4f98a2SYan Zheng #define MOVE_DATA_EXTENTS 0 1545d4f98a2SYan Zheng #define UPDATE_DATA_PTRS 1 1555d4f98a2SYan Zheng 1569569cc20SQu Wenruo static void mark_block_processed(struct reloc_control *rc, 157a26195a5SQu Wenruo struct btrfs_backref_node *node) 1589569cc20SQu Wenruo { 1599569cc20SQu Wenruo u32 blocksize; 1609569cc20SQu Wenruo 1619569cc20SQu Wenruo if (node->level == 0 || 1629569cc20SQu Wenruo in_range(node->bytenr, rc->block_group->start, 1639569cc20SQu Wenruo rc->block_group->length)) { 1649569cc20SQu Wenruo blocksize = rc->extent_root->fs_info->nodesize; 1659569cc20SQu Wenruo set_extent_bits(&rc->processed_blocks, node->bytenr, 1669569cc20SQu Wenruo node->bytenr + blocksize - 1, EXTENT_DIRTY); 1679569cc20SQu Wenruo } 1689569cc20SQu Wenruo node->processed = 1; 1699569cc20SQu Wenruo } 1709569cc20SQu Wenruo 1715d4f98a2SYan Zheng 1725d4f98a2SYan Zheng static void mapping_tree_init(struct mapping_tree *tree) 1735d4f98a2SYan Zheng { 1746bef4d31SEric Paris tree->rb_root = RB_ROOT; 1755d4f98a2SYan Zheng spin_lock_init(&tree->lock); 1765d4f98a2SYan Zheng } 1775d4f98a2SYan Zheng 1785d4f98a2SYan Zheng /* 1795d4f98a2SYan Zheng * walk up backref nodes until reach node presents tree root 1805d4f98a2SYan Zheng */ 181a26195a5SQu Wenruo static struct btrfs_backref_node *walk_up_backref( 182a26195a5SQu Wenruo struct btrfs_backref_node *node, 183a26195a5SQu Wenruo struct btrfs_backref_edge *edges[], int *index) 1845d4f98a2SYan Zheng { 185a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 1865d4f98a2SYan Zheng int idx = *index; 1875d4f98a2SYan Zheng 1885d4f98a2SYan Zheng while (!list_empty(&node->upper)) { 1895d4f98a2SYan Zheng edge = list_entry(node->upper.next, 190a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 1915d4f98a2SYan Zheng edges[idx++] = edge; 1925d4f98a2SYan Zheng node = edge->node[UPPER]; 1935d4f98a2SYan Zheng } 1943fd0a558SYan, Zheng BUG_ON(node->detached); 1955d4f98a2SYan Zheng *index = idx; 1965d4f98a2SYan Zheng return node; 1975d4f98a2SYan Zheng } 1985d4f98a2SYan Zheng 1995d4f98a2SYan Zheng /* 2005d4f98a2SYan Zheng * walk down backref nodes to find start of next reference path 2015d4f98a2SYan Zheng */ 202a26195a5SQu Wenruo static struct btrfs_backref_node *walk_down_backref( 203a26195a5SQu Wenruo struct btrfs_backref_edge *edges[], int *index) 2045d4f98a2SYan Zheng { 205a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 206a26195a5SQu Wenruo struct btrfs_backref_node *lower; 2075d4f98a2SYan Zheng int idx = *index; 2085d4f98a2SYan Zheng 2095d4f98a2SYan Zheng while (idx > 0) { 2105d4f98a2SYan Zheng edge = edges[idx - 1]; 2115d4f98a2SYan Zheng lower = edge->node[LOWER]; 2125d4f98a2SYan Zheng if (list_is_last(&edge->list[LOWER], &lower->upper)) { 2135d4f98a2SYan Zheng idx--; 2145d4f98a2SYan Zheng continue; 2155d4f98a2SYan Zheng } 2165d4f98a2SYan Zheng edge = list_entry(edge->list[LOWER].next, 217a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 2185d4f98a2SYan Zheng edges[idx - 1] = edge; 2195d4f98a2SYan Zheng *index = idx; 2205d4f98a2SYan Zheng return edge->node[UPPER]; 2215d4f98a2SYan Zheng } 2225d4f98a2SYan Zheng *index = 0; 2235d4f98a2SYan Zheng return NULL; 2245d4f98a2SYan Zheng } 2255d4f98a2SYan Zheng 226a26195a5SQu Wenruo static void update_backref_node(struct btrfs_backref_cache *cache, 227a26195a5SQu Wenruo struct btrfs_backref_node *node, u64 bytenr) 2283fd0a558SYan, Zheng { 2293fd0a558SYan, Zheng struct rb_node *rb_node; 2303fd0a558SYan, Zheng rb_erase(&node->rb_node, &cache->rb_root); 2313fd0a558SYan, Zheng node->bytenr = bytenr; 232e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&cache->rb_root, node->bytenr, &node->rb_node); 23343c04fb1SJeff Mahoney if (rb_node) 234982c92cbSQu Wenruo btrfs_backref_panic(cache->fs_info, bytenr, -EEXIST); 2353fd0a558SYan, Zheng } 2363fd0a558SYan, Zheng 2373fd0a558SYan, Zheng /* 2383fd0a558SYan, Zheng * update backref cache after a transaction commit 2393fd0a558SYan, Zheng */ 2403fd0a558SYan, Zheng static int update_backref_cache(struct btrfs_trans_handle *trans, 241a26195a5SQu Wenruo struct btrfs_backref_cache *cache) 2423fd0a558SYan, Zheng { 243a26195a5SQu Wenruo struct btrfs_backref_node *node; 2443fd0a558SYan, Zheng int level = 0; 2453fd0a558SYan, Zheng 2463fd0a558SYan, Zheng if (cache->last_trans == 0) { 2473fd0a558SYan, Zheng cache->last_trans = trans->transid; 2483fd0a558SYan, Zheng return 0; 2493fd0a558SYan, Zheng } 2503fd0a558SYan, Zheng 2513fd0a558SYan, Zheng if (cache->last_trans == trans->transid) 2523fd0a558SYan, Zheng return 0; 2533fd0a558SYan, Zheng 2543fd0a558SYan, Zheng /* 2553fd0a558SYan, Zheng * detached nodes are used to avoid unnecessary backref 2563fd0a558SYan, Zheng * lookup. transaction commit changes the extent tree. 2573fd0a558SYan, Zheng * so the detached nodes are no longer useful. 2583fd0a558SYan, Zheng */ 2593fd0a558SYan, Zheng while (!list_empty(&cache->detached)) { 2603fd0a558SYan, Zheng node = list_entry(cache->detached.next, 261a26195a5SQu Wenruo struct btrfs_backref_node, list); 262023acb07SQu Wenruo btrfs_backref_cleanup_node(cache, node); 2633fd0a558SYan, Zheng } 2643fd0a558SYan, Zheng 2653fd0a558SYan, Zheng while (!list_empty(&cache->changed)) { 2663fd0a558SYan, Zheng node = list_entry(cache->changed.next, 267a26195a5SQu Wenruo struct btrfs_backref_node, list); 2683fd0a558SYan, Zheng list_del_init(&node->list); 2693fd0a558SYan, Zheng BUG_ON(node->pending); 2703fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 2713fd0a558SYan, Zheng } 2723fd0a558SYan, Zheng 2733fd0a558SYan, Zheng /* 2743fd0a558SYan, Zheng * some nodes can be left in the pending list if there were 2753fd0a558SYan, Zheng * errors during processing the pending nodes. 2763fd0a558SYan, Zheng */ 2773fd0a558SYan, Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 2783fd0a558SYan, Zheng list_for_each_entry(node, &cache->pending[level], list) { 2793fd0a558SYan, Zheng BUG_ON(!node->pending); 2803fd0a558SYan, Zheng if (node->bytenr == node->new_bytenr) 2813fd0a558SYan, Zheng continue; 2823fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 2833fd0a558SYan, Zheng } 2843fd0a558SYan, Zheng } 2853fd0a558SYan, Zheng 2863fd0a558SYan, Zheng cache->last_trans = 0; 2873fd0a558SYan, Zheng return 1; 2883fd0a558SYan, Zheng } 2893fd0a558SYan, Zheng 2906282675eSQu Wenruo static bool reloc_root_is_dead(struct btrfs_root *root) 2916282675eSQu Wenruo { 2926282675eSQu Wenruo /* 2936282675eSQu Wenruo * Pair with set_bit/clear_bit in clean_dirty_subvols and 2946282675eSQu Wenruo * btrfs_update_reloc_root. We need to see the updated bit before 2956282675eSQu Wenruo * trying to access reloc_root 2966282675eSQu Wenruo */ 2976282675eSQu Wenruo smp_rmb(); 2986282675eSQu Wenruo if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state)) 2996282675eSQu Wenruo return true; 3006282675eSQu Wenruo return false; 3016282675eSQu Wenruo } 3026282675eSQu Wenruo 3036282675eSQu Wenruo /* 3046282675eSQu Wenruo * Check if this subvolume tree has valid reloc tree. 3056282675eSQu Wenruo * 3066282675eSQu Wenruo * Reloc tree after swap is considered dead, thus not considered as valid. 3076282675eSQu Wenruo * This is enough for most callers, as they don't distinguish dead reloc root 30855465730SQu Wenruo * from no reloc root. But btrfs_should_ignore_reloc_root() below is a 30955465730SQu Wenruo * special case. 3106282675eSQu Wenruo */ 3116282675eSQu Wenruo static bool have_reloc_root(struct btrfs_root *root) 3126282675eSQu Wenruo { 3136282675eSQu Wenruo if (reloc_root_is_dead(root)) 3146282675eSQu Wenruo return false; 3156282675eSQu Wenruo if (!root->reloc_root) 3166282675eSQu Wenruo return false; 3176282675eSQu Wenruo return true; 3186282675eSQu Wenruo } 319f2a97a9dSDavid Sterba 32055465730SQu Wenruo int btrfs_should_ignore_reloc_root(struct btrfs_root *root) 3213fd0a558SYan, Zheng { 3223fd0a558SYan, Zheng struct btrfs_root *reloc_root; 3233fd0a558SYan, Zheng 32492a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 3253fd0a558SYan, Zheng return 0; 3263fd0a558SYan, Zheng 3276282675eSQu Wenruo /* This root has been merged with its reloc tree, we can ignore it */ 3286282675eSQu Wenruo if (reloc_root_is_dead(root)) 3296282675eSQu Wenruo return 1; 3306282675eSQu Wenruo 3313fd0a558SYan, Zheng reloc_root = root->reloc_root; 3323fd0a558SYan, Zheng if (!reloc_root) 3333fd0a558SYan, Zheng return 0; 3343fd0a558SYan, Zheng 3354d4225fcSJosef Bacik if (btrfs_header_generation(reloc_root->commit_root) == 3364d4225fcSJosef Bacik root->fs_info->running_transaction->transid) 3373fd0a558SYan, Zheng return 0; 3383fd0a558SYan, Zheng /* 3393fd0a558SYan, Zheng * if there is reloc tree and it was created in previous 3403fd0a558SYan, Zheng * transaction backref lookup can find the reloc tree, 3413fd0a558SYan, Zheng * so backref node for the fs tree root is useless for 3423fd0a558SYan, Zheng * relocation. 3433fd0a558SYan, Zheng */ 3443fd0a558SYan, Zheng return 1; 3453fd0a558SYan, Zheng } 34655465730SQu Wenruo 3475d4f98a2SYan Zheng /* 3485d4f98a2SYan Zheng * find reloc tree by address of tree root 3495d4f98a2SYan Zheng */ 3502433bea5SQu Wenruo struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info, u64 bytenr) 3515d4f98a2SYan Zheng { 3522433bea5SQu Wenruo struct reloc_control *rc = fs_info->reloc_ctl; 3535d4f98a2SYan Zheng struct rb_node *rb_node; 3545d4f98a2SYan Zheng struct mapping_node *node; 3555d4f98a2SYan Zheng struct btrfs_root *root = NULL; 3565d4f98a2SYan Zheng 3572433bea5SQu Wenruo ASSERT(rc); 3585d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 359e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, bytenr); 3605d4f98a2SYan Zheng if (rb_node) { 3615d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 3625d4f98a2SYan Zheng root = (struct btrfs_root *)node->data; 3635d4f98a2SYan Zheng } 3645d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 36500246528SJosef Bacik return btrfs_grab_root(root); 3665d4f98a2SYan Zheng } 3675d4f98a2SYan Zheng 3685d4f98a2SYan Zheng 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 *node = NULL; 478a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 479e7d571c7SQu Wenruo int ret; 480e7d571c7SQu Wenruo int err = 0; 481e7d571c7SQu Wenruo 482e7d571c7SQu Wenruo iter = btrfs_backref_iter_alloc(rc->extent_root->fs_info, GFP_NOFS); 483e7d571c7SQu Wenruo if (!iter) 484e7d571c7SQu Wenruo return ERR_PTR(-ENOMEM); 485e7d571c7SQu Wenruo path = btrfs_alloc_path(); 486e7d571c7SQu Wenruo if (!path) { 487e7d571c7SQu Wenruo err = -ENOMEM; 488e7d571c7SQu Wenruo goto out; 489e7d571c7SQu Wenruo } 490e7d571c7SQu Wenruo 491b1818dabSQu Wenruo node = btrfs_backref_alloc_node(cache, bytenr, level); 492e7d571c7SQu Wenruo if (!node) { 493e7d571c7SQu Wenruo err = -ENOMEM; 494e7d571c7SQu Wenruo goto out; 495e7d571c7SQu Wenruo } 496e7d571c7SQu Wenruo 497e7d571c7SQu Wenruo node->lowest = 1; 498e7d571c7SQu Wenruo cur = node; 499e7d571c7SQu Wenruo 500e7d571c7SQu Wenruo /* Breadth-first search to build backref cache */ 501e7d571c7SQu Wenruo do { 5021b60d2ecSQu Wenruo ret = btrfs_backref_add_tree_node(cache, path, iter, node_key, 5031b60d2ecSQu Wenruo cur); 504e7d571c7SQu Wenruo if (ret < 0) { 505e7d571c7SQu Wenruo err = ret; 506e7d571c7SQu Wenruo goto out; 507e7d571c7SQu Wenruo } 508e7d571c7SQu Wenruo edge = list_first_entry_or_null(&cache->pending_edge, 509a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 510e7d571c7SQu Wenruo /* 511e7d571c7SQu Wenruo * The pending list isn't empty, take the first block to 512e7d571c7SQu Wenruo * process 513e7d571c7SQu Wenruo */ 514e7d571c7SQu Wenruo if (edge) { 5155d4f98a2SYan Zheng list_del_init(&edge->list[UPPER]); 5165d4f98a2SYan Zheng cur = edge->node[UPPER]; 5175d4f98a2SYan Zheng } 518e7d571c7SQu Wenruo } while (edge); 5195d4f98a2SYan Zheng 5201f872924SQu Wenruo /* Finish the upper linkage of newly added edges/nodes */ 521fc997ed0SQu Wenruo ret = btrfs_backref_finish_upper_links(cache, node); 5221f872924SQu Wenruo if (ret < 0) { 5231f872924SQu Wenruo err = ret; 52475bfb9afSJosef Bacik goto out; 52575bfb9afSJosef Bacik } 52675bfb9afSJosef Bacik 52729db137bSQu Wenruo if (handle_useless_nodes(rc, node)) 5283fd0a558SYan, Zheng node = NULL; 5295d4f98a2SYan Zheng out: 53071f572a9SQu Wenruo btrfs_backref_iter_free(iter); 53171f572a9SQu Wenruo btrfs_free_path(path); 5325d4f98a2SYan Zheng if (err) { 5331b23ea18SQu Wenruo btrfs_backref_error_cleanup(cache, node); 5345d4f98a2SYan Zheng return ERR_PTR(err); 5355d4f98a2SYan Zheng } 53675bfb9afSJosef Bacik ASSERT(!node || !node->detached); 53784780289SQu Wenruo ASSERT(list_empty(&cache->useless_node) && 53884780289SQu Wenruo list_empty(&cache->pending_edge)); 5395d4f98a2SYan Zheng return node; 5405d4f98a2SYan Zheng } 5415d4f98a2SYan Zheng 5425d4f98a2SYan Zheng /* 5433fd0a558SYan, Zheng * helper to add backref node for the newly created snapshot. 5443fd0a558SYan, Zheng * the backref node is created by cloning backref node that 5453fd0a558SYan, Zheng * corresponds to root of source tree 5463fd0a558SYan, Zheng */ 5473fd0a558SYan, Zheng static int clone_backref_node(struct btrfs_trans_handle *trans, 5483fd0a558SYan, Zheng struct reloc_control *rc, 5493fd0a558SYan, Zheng struct btrfs_root *src, 5503fd0a558SYan, Zheng struct btrfs_root *dest) 5513fd0a558SYan, Zheng { 5523fd0a558SYan, Zheng struct btrfs_root *reloc_root = src->reloc_root; 553a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 554a26195a5SQu Wenruo struct btrfs_backref_node *node = NULL; 555a26195a5SQu Wenruo struct btrfs_backref_node *new_node; 556a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 557a26195a5SQu Wenruo struct btrfs_backref_edge *new_edge; 5583fd0a558SYan, Zheng struct rb_node *rb_node; 5593fd0a558SYan, Zheng 5603fd0a558SYan, Zheng if (cache->last_trans > 0) 5613fd0a558SYan, Zheng update_backref_cache(trans, cache); 5623fd0a558SYan, Zheng 563e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, src->commit_root->start); 5643fd0a558SYan, Zheng if (rb_node) { 565a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, rb_node); 5663fd0a558SYan, Zheng if (node->detached) 5673fd0a558SYan, Zheng node = NULL; 5683fd0a558SYan, Zheng else 5693fd0a558SYan, Zheng BUG_ON(node->new_bytenr != reloc_root->node->start); 5703fd0a558SYan, Zheng } 5713fd0a558SYan, Zheng 5723fd0a558SYan, Zheng if (!node) { 573e9a28dc5SQu Wenruo rb_node = rb_simple_search(&cache->rb_root, 5743fd0a558SYan, Zheng reloc_root->commit_root->start); 5753fd0a558SYan, Zheng if (rb_node) { 576a26195a5SQu Wenruo node = rb_entry(rb_node, struct btrfs_backref_node, 5773fd0a558SYan, Zheng rb_node); 5783fd0a558SYan, Zheng BUG_ON(node->detached); 5793fd0a558SYan, Zheng } 5803fd0a558SYan, Zheng } 5813fd0a558SYan, Zheng 5823fd0a558SYan, Zheng if (!node) 5833fd0a558SYan, Zheng return 0; 5843fd0a558SYan, Zheng 585b1818dabSQu Wenruo new_node = btrfs_backref_alloc_node(cache, dest->node->start, 586b1818dabSQu Wenruo node->level); 5873fd0a558SYan, Zheng if (!new_node) 5883fd0a558SYan, Zheng return -ENOMEM; 5893fd0a558SYan, Zheng 5903fd0a558SYan, Zheng new_node->lowest = node->lowest; 5916848ad64SYan, Zheng new_node->checked = 1; 59200246528SJosef Bacik new_node->root = btrfs_grab_root(dest); 5930b530bc5SJosef Bacik ASSERT(new_node->root); 5943fd0a558SYan, Zheng 5953fd0a558SYan, Zheng if (!node->lowest) { 5963fd0a558SYan, Zheng list_for_each_entry(edge, &node->lower, list[UPPER]) { 59747254d07SQu Wenruo new_edge = btrfs_backref_alloc_edge(cache); 5983fd0a558SYan, Zheng if (!new_edge) 5993fd0a558SYan, Zheng goto fail; 6003fd0a558SYan, Zheng 601f39911e5SQu Wenruo btrfs_backref_link_edge(new_edge, edge->node[LOWER], 602f39911e5SQu Wenruo new_node, LINK_UPPER); 6033fd0a558SYan, Zheng } 60476b9e23dSMiao Xie } else { 60576b9e23dSMiao Xie list_add_tail(&new_node->lower, &cache->leaves); 6063fd0a558SYan, Zheng } 6073fd0a558SYan, Zheng 608e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&cache->rb_root, new_node->bytenr, 6093fd0a558SYan, Zheng &new_node->rb_node); 61043c04fb1SJeff Mahoney if (rb_node) 611982c92cbSQu Wenruo btrfs_backref_panic(trans->fs_info, new_node->bytenr, -EEXIST); 6123fd0a558SYan, Zheng 6133fd0a558SYan, Zheng if (!new_node->lowest) { 6143fd0a558SYan, Zheng list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { 6153fd0a558SYan, Zheng list_add_tail(&new_edge->list[LOWER], 6163fd0a558SYan, Zheng &new_edge->node[LOWER]->upper); 6173fd0a558SYan, Zheng } 6183fd0a558SYan, Zheng } 6193fd0a558SYan, Zheng return 0; 6203fd0a558SYan, Zheng fail: 6213fd0a558SYan, Zheng while (!list_empty(&new_node->lower)) { 6223fd0a558SYan, Zheng new_edge = list_entry(new_node->lower.next, 623a26195a5SQu Wenruo struct btrfs_backref_edge, list[UPPER]); 6243fd0a558SYan, Zheng list_del(&new_edge->list[UPPER]); 625741188d3SQu Wenruo btrfs_backref_free_edge(cache, new_edge); 6263fd0a558SYan, Zheng } 627741188d3SQu Wenruo btrfs_backref_free_node(cache, new_node); 6283fd0a558SYan, Zheng return -ENOMEM; 6293fd0a558SYan, Zheng } 6303fd0a558SYan, Zheng 6313fd0a558SYan, Zheng /* 6325d4f98a2SYan Zheng * helper to add 'address of tree root -> reloc tree' mapping 6335d4f98a2SYan Zheng */ 634ffd7b339SJeff Mahoney static int __must_check __add_reloc_root(struct btrfs_root *root) 6355d4f98a2SYan Zheng { 6360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 6375d4f98a2SYan Zheng struct rb_node *rb_node; 6385d4f98a2SYan Zheng struct mapping_node *node; 6390b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 6405d4f98a2SYan Zheng 6415d4f98a2SYan Zheng node = kmalloc(sizeof(*node), GFP_NOFS); 642ffd7b339SJeff Mahoney if (!node) 643ffd7b339SJeff Mahoney return -ENOMEM; 6445d4f98a2SYan Zheng 645ea287ab1SJosef Bacik node->bytenr = root->commit_root->start; 6465d4f98a2SYan Zheng node->data = root; 6475d4f98a2SYan Zheng 6485d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 649e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 6505d4f98a2SYan Zheng node->bytenr, &node->rb_node); 6515d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 652ffd7b339SJeff Mahoney if (rb_node) { 6530b246afaSJeff Mahoney btrfs_panic(fs_info, -EEXIST, 6545d163e0eSJeff Mahoney "Duplicate root found for start=%llu while inserting into relocation tree", 6555d163e0eSJeff Mahoney node->bytenr); 656ffd7b339SJeff Mahoney } 6575d4f98a2SYan Zheng 6585d4f98a2SYan Zheng list_add_tail(&root->root_list, &rc->reloc_roots); 6595d4f98a2SYan Zheng return 0; 6605d4f98a2SYan Zheng } 6615d4f98a2SYan Zheng 6625d4f98a2SYan Zheng /* 663c974c464SWang Shilong * helper to delete the 'address of tree root -> reloc tree' 6645d4f98a2SYan Zheng * mapping 6655d4f98a2SYan Zheng */ 666c974c464SWang Shilong static void __del_reloc_root(struct btrfs_root *root) 6675d4f98a2SYan Zheng { 6680b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 6695d4f98a2SYan Zheng struct rb_node *rb_node; 6705d4f98a2SYan Zheng struct mapping_node *node = NULL; 6710b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 672f44deb74SJosef Bacik bool put_ref = false; 6735d4f98a2SYan Zheng 67465c6e82bSQu Wenruo if (rc && root->node) { 6755d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 676e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 677ea287ab1SJosef Bacik root->commit_root->start); 678c974c464SWang Shilong if (rb_node) { 679c974c464SWang Shilong node = rb_entry(rb_node, struct mapping_node, rb_node); 680c974c464SWang Shilong rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 681ea287ab1SJosef Bacik RB_CLEAR_NODE(&node->rb_node); 682c974c464SWang Shilong } 683c974c464SWang Shilong spin_unlock(&rc->reloc_root_tree.lock); 684c974c464SWang Shilong if (!node) 685c974c464SWang Shilong return; 686c974c464SWang Shilong BUG_ON((struct btrfs_root *)node->data != root); 687389305b2SQu Wenruo } 688c974c464SWang Shilong 689f44deb74SJosef Bacik /* 690f44deb74SJosef Bacik * We only put the reloc root here if it's on the list. There's a lot 691f44deb74SJosef Bacik * of places where the pattern is to splice the rc->reloc_roots, process 692f44deb74SJosef Bacik * the reloc roots, and then add the reloc root back onto 693f44deb74SJosef Bacik * rc->reloc_roots. If we call __del_reloc_root while it's off of the 694f44deb74SJosef Bacik * list we don't want the reference being dropped, because the guy 695f44deb74SJosef Bacik * messing with the list is in charge of the reference. 696f44deb74SJosef Bacik */ 6970b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 698f44deb74SJosef Bacik if (!list_empty(&root->root_list)) { 699f44deb74SJosef Bacik put_ref = true; 700c974c464SWang Shilong list_del_init(&root->root_list); 701f44deb74SJosef Bacik } 7020b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 703f44deb74SJosef Bacik if (put_ref) 704f44deb74SJosef Bacik btrfs_put_root(root); 705c974c464SWang Shilong kfree(node); 706c974c464SWang Shilong } 707c974c464SWang Shilong 708c974c464SWang Shilong /* 709c974c464SWang Shilong * helper to update the 'address of tree root -> reloc tree' 710c974c464SWang Shilong * mapping 711c974c464SWang Shilong */ 712ea287ab1SJosef Bacik static int __update_reloc_root(struct btrfs_root *root) 713c974c464SWang Shilong { 7140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 715c974c464SWang Shilong struct rb_node *rb_node; 716c974c464SWang Shilong struct mapping_node *node = NULL; 7170b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 718c974c464SWang Shilong 719c974c464SWang Shilong spin_lock(&rc->reloc_root_tree.lock); 720e9a28dc5SQu Wenruo rb_node = rb_simple_search(&rc->reloc_root_tree.rb_root, 721ea287ab1SJosef Bacik root->commit_root->start); 7225d4f98a2SYan Zheng if (rb_node) { 7235d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 7245d4f98a2SYan Zheng rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 7255d4f98a2SYan Zheng } 7265d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 7275d4f98a2SYan Zheng 7288f71f3e0SLiu Bo if (!node) 7298f71f3e0SLiu Bo return 0; 7305d4f98a2SYan Zheng BUG_ON((struct btrfs_root *)node->data != root); 7315d4f98a2SYan Zheng 7325d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 733ea287ab1SJosef Bacik node->bytenr = root->node->start; 734e9a28dc5SQu Wenruo rb_node = rb_simple_insert(&rc->reloc_root_tree.rb_root, 7355d4f98a2SYan Zheng node->bytenr, &node->rb_node); 7365d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 73743c04fb1SJeff Mahoney if (rb_node) 738982c92cbSQu Wenruo btrfs_backref_panic(fs_info, node->bytenr, -EEXIST); 7395d4f98a2SYan Zheng return 0; 7405d4f98a2SYan Zheng } 7415d4f98a2SYan Zheng 7423fd0a558SYan, Zheng static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, 7433fd0a558SYan, Zheng struct btrfs_root *root, u64 objectid) 7445d4f98a2SYan Zheng { 7450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 7465d4f98a2SYan Zheng struct btrfs_root *reloc_root; 7475d4f98a2SYan Zheng struct extent_buffer *eb; 7485d4f98a2SYan Zheng struct btrfs_root_item *root_item; 7495d4f98a2SYan Zheng struct btrfs_key root_key; 7505d4f98a2SYan Zheng int ret; 7515d4f98a2SYan Zheng 7525d4f98a2SYan Zheng root_item = kmalloc(sizeof(*root_item), GFP_NOFS); 7535d4f98a2SYan Zheng BUG_ON(!root_item); 7545d4f98a2SYan Zheng 7555d4f98a2SYan Zheng root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; 7565d4f98a2SYan Zheng root_key.type = BTRFS_ROOT_ITEM_KEY; 7573fd0a558SYan, Zheng root_key.offset = objectid; 7585d4f98a2SYan Zheng 7593fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 760054570a1SFilipe Manana u64 commit_root_gen; 761054570a1SFilipe Manana 7623fd0a558SYan, Zheng /* called by btrfs_init_reloc_root */ 7635d4f98a2SYan Zheng ret = btrfs_copy_root(trans, root, root->commit_root, &eb, 7645d4f98a2SYan Zheng BTRFS_TREE_RELOC_OBJECTID); 7655d4f98a2SYan Zheng BUG_ON(ret); 766054570a1SFilipe Manana /* 767054570a1SFilipe Manana * Set the last_snapshot field to the generation of the commit 768054570a1SFilipe Manana * root - like this ctree.c:btrfs_block_can_be_shared() behaves 769054570a1SFilipe Manana * correctly (returns true) when the relocation root is created 770054570a1SFilipe Manana * either inside the critical section of a transaction commit 771054570a1SFilipe Manana * (through transaction.c:qgroup_account_snapshot()) and when 772054570a1SFilipe Manana * it's created before the transaction commit is started. 773054570a1SFilipe Manana */ 774054570a1SFilipe Manana commit_root_gen = btrfs_header_generation(root->commit_root); 775054570a1SFilipe Manana btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen); 7763fd0a558SYan, Zheng } else { 7773fd0a558SYan, Zheng /* 7783fd0a558SYan, Zheng * called by btrfs_reloc_post_snapshot_hook. 7793fd0a558SYan, Zheng * the source tree is a reloc tree, all tree blocks 7803fd0a558SYan, Zheng * modified after it was created have RELOC flag 7813fd0a558SYan, Zheng * set in their headers. so it's OK to not update 7823fd0a558SYan, Zheng * the 'last_snapshot'. 7833fd0a558SYan, Zheng */ 7843fd0a558SYan, Zheng ret = btrfs_copy_root(trans, root, root->node, &eb, 7853fd0a558SYan, Zheng BTRFS_TREE_RELOC_OBJECTID); 7863fd0a558SYan, Zheng BUG_ON(ret); 7873fd0a558SYan, Zheng } 7883fd0a558SYan, Zheng 7895d4f98a2SYan Zheng memcpy(root_item, &root->root_item, sizeof(*root_item)); 7905d4f98a2SYan Zheng btrfs_set_root_bytenr(root_item, eb->start); 7915d4f98a2SYan Zheng btrfs_set_root_level(root_item, btrfs_header_level(eb)); 7925d4f98a2SYan Zheng btrfs_set_root_generation(root_item, trans->transid); 7933fd0a558SYan, Zheng 7943fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 7953fd0a558SYan, Zheng btrfs_set_root_refs(root_item, 0); 7963fd0a558SYan, Zheng memset(&root_item->drop_progress, 0, 7973fd0a558SYan, Zheng sizeof(struct btrfs_disk_key)); 7985d4f98a2SYan Zheng root_item->drop_level = 0; 7993fd0a558SYan, Zheng } 8005d4f98a2SYan Zheng 8015d4f98a2SYan Zheng btrfs_tree_unlock(eb); 8025d4f98a2SYan Zheng free_extent_buffer(eb); 8035d4f98a2SYan Zheng 8040b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, 8055d4f98a2SYan Zheng &root_key, root_item); 8065d4f98a2SYan Zheng BUG_ON(ret); 8075d4f98a2SYan Zheng kfree(root_item); 8085d4f98a2SYan Zheng 8093dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(fs_info->tree_root, &root_key); 8105d4f98a2SYan Zheng BUG_ON(IS_ERR(reloc_root)); 81192a7cc42SQu Wenruo set_bit(BTRFS_ROOT_SHAREABLE, &reloc_root->state); 8125d4f98a2SYan Zheng reloc_root->last_trans = trans->transid; 8133fd0a558SYan, Zheng return reloc_root; 8143fd0a558SYan, Zheng } 8153fd0a558SYan, Zheng 8163fd0a558SYan, Zheng /* 8173fd0a558SYan, Zheng * create reloc tree for a given fs tree. reloc tree is just a 8183fd0a558SYan, Zheng * snapshot of the fs tree with special root objectid. 819f44deb74SJosef Bacik * 820f44deb74SJosef Bacik * The reloc_root comes out of here with two references, one for 821f44deb74SJosef Bacik * root->reloc_root, and another for being on the rc->reloc_roots list. 8223fd0a558SYan, Zheng */ 8233fd0a558SYan, Zheng int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 8243fd0a558SYan, Zheng struct btrfs_root *root) 8253fd0a558SYan, Zheng { 8260b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 8273fd0a558SYan, Zheng struct btrfs_root *reloc_root; 8280b246afaSJeff Mahoney struct reloc_control *rc = fs_info->reloc_ctl; 82920dd2cbfSMiao Xie struct btrfs_block_rsv *rsv; 8303fd0a558SYan, Zheng int clear_rsv = 0; 831ffd7b339SJeff Mahoney int ret; 8323fd0a558SYan, Zheng 833aec7db3bSJosef Bacik if (!rc) 8342abc726aSJosef Bacik return 0; 8352abc726aSJosef Bacik 8361fac4a54SQu Wenruo /* 8371fac4a54SQu Wenruo * The subvolume has reloc tree but the swap is finished, no need to 8381fac4a54SQu Wenruo * create/update the dead reloc tree 8391fac4a54SQu Wenruo */ 8406282675eSQu Wenruo if (reloc_root_is_dead(root)) 8411fac4a54SQu Wenruo return 0; 8421fac4a54SQu Wenruo 843aec7db3bSJosef Bacik /* 844aec7db3bSJosef Bacik * This is subtle but important. We do not do 845aec7db3bSJosef Bacik * record_root_in_transaction for reloc roots, instead we record their 846aec7db3bSJosef Bacik * corresponding fs root, and then here we update the last trans for the 847aec7db3bSJosef Bacik * reloc root. This means that we have to do this for the entire life 848aec7db3bSJosef Bacik * of the reloc root, regardless of which stage of the relocation we are 849aec7db3bSJosef Bacik * in. 850aec7db3bSJosef Bacik */ 8513fd0a558SYan, Zheng if (root->reloc_root) { 8523fd0a558SYan, Zheng reloc_root = root->reloc_root; 8533fd0a558SYan, Zheng reloc_root->last_trans = trans->transid; 8543fd0a558SYan, Zheng return 0; 8553fd0a558SYan, Zheng } 8563fd0a558SYan, Zheng 857aec7db3bSJosef Bacik /* 858aec7db3bSJosef Bacik * We are merging reloc roots, we do not need new reloc trees. Also 859aec7db3bSJosef Bacik * reloc trees never need their own reloc tree. 860aec7db3bSJosef Bacik */ 861aec7db3bSJosef Bacik if (!rc->create_reloc_tree || 862aec7db3bSJosef Bacik root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 863aec7db3bSJosef Bacik return 0; 864aec7db3bSJosef Bacik 86520dd2cbfSMiao Xie if (!trans->reloc_reserved) { 86620dd2cbfSMiao Xie rsv = trans->block_rsv; 8673fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 8683fd0a558SYan, Zheng clear_rsv = 1; 8693fd0a558SYan, Zheng } 8703fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root, root->root_key.objectid); 8713fd0a558SYan, Zheng if (clear_rsv) 87220dd2cbfSMiao Xie trans->block_rsv = rsv; 8735d4f98a2SYan Zheng 874ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 875ffd7b339SJeff Mahoney BUG_ON(ret < 0); 876f44deb74SJosef Bacik root->reloc_root = btrfs_grab_root(reloc_root); 8775d4f98a2SYan Zheng return 0; 8785d4f98a2SYan Zheng } 8795d4f98a2SYan Zheng 8805d4f98a2SYan Zheng /* 8815d4f98a2SYan Zheng * update root item of reloc tree 8825d4f98a2SYan Zheng */ 8835d4f98a2SYan Zheng int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 8845d4f98a2SYan Zheng struct btrfs_root *root) 8855d4f98a2SYan Zheng { 8860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 8875d4f98a2SYan Zheng struct btrfs_root *reloc_root; 8885d4f98a2SYan Zheng struct btrfs_root_item *root_item; 8895d4f98a2SYan Zheng int ret; 8905d4f98a2SYan Zheng 8916282675eSQu Wenruo if (!have_reloc_root(root)) 8927585717fSChris Mason goto out; 8935d4f98a2SYan Zheng 8945d4f98a2SYan Zheng reloc_root = root->reloc_root; 8955d4f98a2SYan Zheng root_item = &reloc_root->root_item; 8965d4f98a2SYan Zheng 897f44deb74SJosef Bacik /* 898f44deb74SJosef Bacik * We are probably ok here, but __del_reloc_root() will drop its ref of 899f44deb74SJosef Bacik * the root. We have the ref for root->reloc_root, but just in case 900f44deb74SJosef Bacik * hold it while we update the reloc root. 901f44deb74SJosef Bacik */ 902f44deb74SJosef Bacik btrfs_grab_root(reloc_root); 903f44deb74SJosef Bacik 904d2311e69SQu Wenruo /* root->reloc_root will stay until current relocation finished */ 9050b246afaSJeff Mahoney if (fs_info->reloc_ctl->merge_reloc_tree && 9063fd0a558SYan, Zheng btrfs_root_refs(root_item) == 0) { 907d2311e69SQu Wenruo set_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 9086282675eSQu Wenruo /* 9096282675eSQu Wenruo * Mark the tree as dead before we change reloc_root so 9106282675eSQu Wenruo * have_reloc_root will not touch it from now on. 9116282675eSQu Wenruo */ 9126282675eSQu Wenruo smp_wmb(); 913c974c464SWang Shilong __del_reloc_root(reloc_root); 9145d4f98a2SYan Zheng } 9155d4f98a2SYan Zheng 9165d4f98a2SYan Zheng if (reloc_root->commit_root != reloc_root->node) { 917ea287ab1SJosef Bacik __update_reloc_root(reloc_root); 9185d4f98a2SYan Zheng btrfs_set_root_node(root_item, reloc_root->node); 9195d4f98a2SYan Zheng free_extent_buffer(reloc_root->commit_root); 9205d4f98a2SYan Zheng reloc_root->commit_root = btrfs_root_node(reloc_root); 9215d4f98a2SYan Zheng } 9225d4f98a2SYan Zheng 9230b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 9245d4f98a2SYan Zheng &reloc_root->root_key, root_item); 9255d4f98a2SYan Zheng BUG_ON(ret); 926f44deb74SJosef Bacik btrfs_put_root(reloc_root); 9277585717fSChris Mason out: 9285d4f98a2SYan Zheng return 0; 9295d4f98a2SYan Zheng } 9305d4f98a2SYan Zheng 9315d4f98a2SYan Zheng /* 9325d4f98a2SYan Zheng * helper to find first cached inode with inode number >= objectid 9335d4f98a2SYan Zheng * in a subvolume 9345d4f98a2SYan Zheng */ 9355d4f98a2SYan Zheng static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) 9365d4f98a2SYan Zheng { 9375d4f98a2SYan Zheng struct rb_node *node; 9385d4f98a2SYan Zheng struct rb_node *prev; 9395d4f98a2SYan Zheng struct btrfs_inode *entry; 9405d4f98a2SYan Zheng struct inode *inode; 9415d4f98a2SYan Zheng 9425d4f98a2SYan Zheng spin_lock(&root->inode_lock); 9435d4f98a2SYan Zheng again: 9445d4f98a2SYan Zheng node = root->inode_tree.rb_node; 9455d4f98a2SYan Zheng prev = NULL; 9465d4f98a2SYan Zheng while (node) { 9475d4f98a2SYan Zheng prev = node; 9485d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 9495d4f98a2SYan Zheng 9504a0cc7caSNikolay Borisov if (objectid < btrfs_ino(entry)) 9515d4f98a2SYan Zheng node = node->rb_left; 9524a0cc7caSNikolay Borisov else if (objectid > btrfs_ino(entry)) 9535d4f98a2SYan Zheng node = node->rb_right; 9545d4f98a2SYan Zheng else 9555d4f98a2SYan Zheng break; 9565d4f98a2SYan Zheng } 9575d4f98a2SYan Zheng if (!node) { 9585d4f98a2SYan Zheng while (prev) { 9595d4f98a2SYan Zheng entry = rb_entry(prev, struct btrfs_inode, rb_node); 9604a0cc7caSNikolay Borisov if (objectid <= btrfs_ino(entry)) { 9615d4f98a2SYan Zheng node = prev; 9625d4f98a2SYan Zheng break; 9635d4f98a2SYan Zheng } 9645d4f98a2SYan Zheng prev = rb_next(prev); 9655d4f98a2SYan Zheng } 9665d4f98a2SYan Zheng } 9675d4f98a2SYan Zheng while (node) { 9685d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 9695d4f98a2SYan Zheng inode = igrab(&entry->vfs_inode); 9705d4f98a2SYan Zheng if (inode) { 9715d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 9725d4f98a2SYan Zheng return inode; 9735d4f98a2SYan Zheng } 9745d4f98a2SYan Zheng 9754a0cc7caSNikolay Borisov objectid = btrfs_ino(entry) + 1; 9765d4f98a2SYan Zheng if (cond_resched_lock(&root->inode_lock)) 9775d4f98a2SYan Zheng goto again; 9785d4f98a2SYan Zheng 9795d4f98a2SYan Zheng node = rb_next(node); 9805d4f98a2SYan Zheng } 9815d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 9825d4f98a2SYan Zheng return NULL; 9835d4f98a2SYan Zheng } 9845d4f98a2SYan Zheng 9855d4f98a2SYan Zheng /* 9865d4f98a2SYan Zheng * get new location of data 9875d4f98a2SYan Zheng */ 9885d4f98a2SYan Zheng static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, 9895d4f98a2SYan Zheng u64 bytenr, u64 num_bytes) 9905d4f98a2SYan Zheng { 9915d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(reloc_inode)->root; 9925d4f98a2SYan Zheng struct btrfs_path *path; 9935d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 9945d4f98a2SYan Zheng struct extent_buffer *leaf; 9955d4f98a2SYan Zheng int ret; 9965d4f98a2SYan Zheng 9975d4f98a2SYan Zheng path = btrfs_alloc_path(); 9985d4f98a2SYan Zheng if (!path) 9995d4f98a2SYan Zheng return -ENOMEM; 10005d4f98a2SYan Zheng 10015d4f98a2SYan Zheng bytenr -= BTRFS_I(reloc_inode)->index_cnt; 1002f85b7379SDavid Sterba ret = btrfs_lookup_file_extent(NULL, root, path, 1003f85b7379SDavid Sterba btrfs_ino(BTRFS_I(reloc_inode)), bytenr, 0); 10045d4f98a2SYan Zheng if (ret < 0) 10055d4f98a2SYan Zheng goto out; 10065d4f98a2SYan Zheng if (ret > 0) { 10075d4f98a2SYan Zheng ret = -ENOENT; 10085d4f98a2SYan Zheng goto out; 10095d4f98a2SYan Zheng } 10105d4f98a2SYan Zheng 10115d4f98a2SYan Zheng leaf = path->nodes[0]; 10125d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, path->slots[0], 10135d4f98a2SYan Zheng struct btrfs_file_extent_item); 10145d4f98a2SYan Zheng 10155d4f98a2SYan Zheng BUG_ON(btrfs_file_extent_offset(leaf, fi) || 10165d4f98a2SYan Zheng btrfs_file_extent_compression(leaf, fi) || 10175d4f98a2SYan Zheng btrfs_file_extent_encryption(leaf, fi) || 10185d4f98a2SYan Zheng btrfs_file_extent_other_encoding(leaf, fi)); 10195d4f98a2SYan Zheng 10205d4f98a2SYan Zheng if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { 102183d4cfd4SJosef Bacik ret = -EINVAL; 10225d4f98a2SYan Zheng goto out; 10235d4f98a2SYan Zheng } 10245d4f98a2SYan Zheng 10255d4f98a2SYan Zheng *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 10265d4f98a2SYan Zheng ret = 0; 10275d4f98a2SYan Zheng out: 10285d4f98a2SYan Zheng btrfs_free_path(path); 10295d4f98a2SYan Zheng return ret; 10305d4f98a2SYan Zheng } 10315d4f98a2SYan Zheng 10325d4f98a2SYan Zheng /* 10335d4f98a2SYan Zheng * update file extent items in the tree leaf to point to 10345d4f98a2SYan Zheng * the new locations. 10355d4f98a2SYan Zheng */ 10363fd0a558SYan, Zheng static noinline_for_stack 10373fd0a558SYan, Zheng int replace_file_extents(struct btrfs_trans_handle *trans, 10385d4f98a2SYan Zheng struct reloc_control *rc, 10395d4f98a2SYan Zheng struct btrfs_root *root, 10403fd0a558SYan, Zheng struct extent_buffer *leaf) 10415d4f98a2SYan Zheng { 10420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 10435d4f98a2SYan Zheng struct btrfs_key key; 10445d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 10455d4f98a2SYan Zheng struct inode *inode = NULL; 10465d4f98a2SYan Zheng u64 parent; 10475d4f98a2SYan Zheng u64 bytenr; 10483fd0a558SYan, Zheng u64 new_bytenr = 0; 10495d4f98a2SYan Zheng u64 num_bytes; 10505d4f98a2SYan Zheng u64 end; 10515d4f98a2SYan Zheng u32 nritems; 10525d4f98a2SYan Zheng u32 i; 105383d4cfd4SJosef Bacik int ret = 0; 10545d4f98a2SYan Zheng int first = 1; 10555d4f98a2SYan Zheng int dirty = 0; 10565d4f98a2SYan Zheng 10575d4f98a2SYan Zheng if (rc->stage != UPDATE_DATA_PTRS) 10585d4f98a2SYan Zheng return 0; 10595d4f98a2SYan Zheng 10605d4f98a2SYan Zheng /* reloc trees always use full backref */ 10615d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 10625d4f98a2SYan Zheng parent = leaf->start; 10635d4f98a2SYan Zheng else 10645d4f98a2SYan Zheng parent = 0; 10655d4f98a2SYan Zheng 10665d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 10675d4f98a2SYan Zheng for (i = 0; i < nritems; i++) { 106882fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 106982fa113fSQu Wenruo 10705d4f98a2SYan Zheng cond_resched(); 10715d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, i); 10725d4f98a2SYan Zheng if (key.type != BTRFS_EXTENT_DATA_KEY) 10735d4f98a2SYan Zheng continue; 10745d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 10755d4f98a2SYan Zheng if (btrfs_file_extent_type(leaf, fi) == 10765d4f98a2SYan Zheng BTRFS_FILE_EXTENT_INLINE) 10775d4f98a2SYan Zheng continue; 10785d4f98a2SYan Zheng bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 10795d4f98a2SYan Zheng num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); 10805d4f98a2SYan Zheng if (bytenr == 0) 10815d4f98a2SYan Zheng continue; 10829569cc20SQu Wenruo if (!in_range(bytenr, rc->block_group->start, 10839569cc20SQu Wenruo rc->block_group->length)) 10845d4f98a2SYan Zheng continue; 10855d4f98a2SYan Zheng 10865d4f98a2SYan Zheng /* 10875d4f98a2SYan Zheng * if we are modifying block in fs tree, wait for readpage 10885d4f98a2SYan Zheng * to complete and drop the extent cache 10895d4f98a2SYan Zheng */ 10905d4f98a2SYan Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 10915d4f98a2SYan Zheng if (first) { 10925d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 10935d4f98a2SYan Zheng first = 0; 10944a0cc7caSNikolay Borisov } else if (inode && btrfs_ino(BTRFS_I(inode)) < key.objectid) { 10953fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 10965d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 10975d4f98a2SYan Zheng } 10984a0cc7caSNikolay Borisov if (inode && btrfs_ino(BTRFS_I(inode)) == key.objectid) { 10995d4f98a2SYan Zheng end = key.offset + 11005d4f98a2SYan Zheng btrfs_file_extent_num_bytes(leaf, fi); 11015d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(key.offset, 11020b246afaSJeff Mahoney fs_info->sectorsize)); 11030b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 11045d4f98a2SYan Zheng end--; 11055d4f98a2SYan Zheng ret = try_lock_extent(&BTRFS_I(inode)->io_tree, 1106d0082371SJeff Mahoney key.offset, end); 11075d4f98a2SYan Zheng if (!ret) 11085d4f98a2SYan Zheng continue; 11095d4f98a2SYan Zheng 1110dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), 1111dcdbc059SNikolay Borisov key.offset, end, 1); 11125d4f98a2SYan Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 1113d0082371SJeff Mahoney key.offset, end); 11145d4f98a2SYan Zheng } 11155d4f98a2SYan Zheng } 11165d4f98a2SYan Zheng 11175d4f98a2SYan Zheng ret = get_new_location(rc->data_inode, &new_bytenr, 11185d4f98a2SYan Zheng bytenr, num_bytes); 111983d4cfd4SJosef Bacik if (ret) { 112083d4cfd4SJosef Bacik /* 112183d4cfd4SJosef Bacik * Don't have to abort since we've not changed anything 112283d4cfd4SJosef Bacik * in the file extent yet. 112383d4cfd4SJosef Bacik */ 112483d4cfd4SJosef Bacik break; 11253fd0a558SYan, Zheng } 11265d4f98a2SYan Zheng 11275d4f98a2SYan Zheng btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); 11285d4f98a2SYan Zheng dirty = 1; 11295d4f98a2SYan Zheng 11305d4f98a2SYan Zheng key.offset -= btrfs_file_extent_offset(leaf, fi); 113182fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 113282fa113fSQu Wenruo num_bytes, parent); 113382fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 113482fa113fSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1135b06c4bf5SFilipe Manana key.objectid, key.offset); 113682fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 113783d4cfd4SJosef Bacik if (ret) { 113866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 113983d4cfd4SJosef Bacik break; 114083d4cfd4SJosef Bacik } 11415d4f98a2SYan Zheng 1142ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, bytenr, 1143ffd4bb2aSQu Wenruo num_bytes, parent); 1144ffd4bb2aSQu Wenruo ref.real_root = root->root_key.objectid; 1145ffd4bb2aSQu Wenruo btrfs_init_data_ref(&ref, btrfs_header_owner(leaf), 1146b06c4bf5SFilipe Manana key.objectid, key.offset); 1147ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 114883d4cfd4SJosef Bacik if (ret) { 114966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 115083d4cfd4SJosef Bacik break; 115183d4cfd4SJosef Bacik } 11525d4f98a2SYan Zheng } 11535d4f98a2SYan Zheng if (dirty) 11545d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 11553fd0a558SYan, Zheng if (inode) 11563fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 115783d4cfd4SJosef Bacik return ret; 11585d4f98a2SYan Zheng } 11595d4f98a2SYan Zheng 11605d4f98a2SYan Zheng static noinline_for_stack 11615d4f98a2SYan Zheng int memcmp_node_keys(struct extent_buffer *eb, int slot, 11625d4f98a2SYan Zheng struct btrfs_path *path, int level) 11635d4f98a2SYan Zheng { 11645d4f98a2SYan Zheng struct btrfs_disk_key key1; 11655d4f98a2SYan Zheng struct btrfs_disk_key key2; 11665d4f98a2SYan Zheng btrfs_node_key(eb, &key1, slot); 11675d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &key2, path->slots[level]); 11685d4f98a2SYan Zheng return memcmp(&key1, &key2, sizeof(key1)); 11695d4f98a2SYan Zheng } 11705d4f98a2SYan Zheng 11715d4f98a2SYan Zheng /* 11725d4f98a2SYan Zheng * try to replace tree blocks in fs tree with the new blocks 11735d4f98a2SYan Zheng * in reloc tree. tree blocks haven't been modified since the 11745d4f98a2SYan Zheng * reloc tree was create can be replaced. 11755d4f98a2SYan Zheng * 11765d4f98a2SYan Zheng * if a block was replaced, level of the block + 1 is returned. 11775d4f98a2SYan Zheng * if no block got replaced, 0 is returned. if there are other 11785d4f98a2SYan Zheng * errors, a negative error number is returned. 11795d4f98a2SYan Zheng */ 11803fd0a558SYan, Zheng static noinline_for_stack 11813d0174f7SQu Wenruo int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc, 11825d4f98a2SYan Zheng struct btrfs_root *dest, struct btrfs_root *src, 11835d4f98a2SYan Zheng struct btrfs_path *path, struct btrfs_key *next_key, 11845d4f98a2SYan Zheng int lowest_level, int max_level) 11855d4f98a2SYan Zheng { 11860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = dest->fs_info; 11875d4f98a2SYan Zheng struct extent_buffer *eb; 11885d4f98a2SYan Zheng struct extent_buffer *parent; 118982fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 11905d4f98a2SYan Zheng struct btrfs_key key; 11915d4f98a2SYan Zheng u64 old_bytenr; 11925d4f98a2SYan Zheng u64 new_bytenr; 11935d4f98a2SYan Zheng u64 old_ptr_gen; 11945d4f98a2SYan Zheng u64 new_ptr_gen; 11955d4f98a2SYan Zheng u64 last_snapshot; 11965d4f98a2SYan Zheng u32 blocksize; 11973fd0a558SYan, Zheng int cow = 0; 11985d4f98a2SYan Zheng int level; 11995d4f98a2SYan Zheng int ret; 12005d4f98a2SYan Zheng int slot; 12015d4f98a2SYan Zheng 12025d4f98a2SYan Zheng BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 12035d4f98a2SYan Zheng BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); 12045d4f98a2SYan Zheng 12055d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&src->root_item); 12063fd0a558SYan, Zheng again: 12075d4f98a2SYan Zheng slot = path->slots[lowest_level]; 12085d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); 12095d4f98a2SYan Zheng 12105d4f98a2SYan Zheng eb = btrfs_lock_root_node(dest); 12118bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12125d4f98a2SYan Zheng level = btrfs_header_level(eb); 12135d4f98a2SYan Zheng 12145d4f98a2SYan Zheng if (level < lowest_level) { 12155d4f98a2SYan Zheng btrfs_tree_unlock(eb); 12165d4f98a2SYan Zheng free_extent_buffer(eb); 12175d4f98a2SYan Zheng return 0; 12185d4f98a2SYan Zheng } 12195d4f98a2SYan Zheng 12203fd0a558SYan, Zheng if (cow) { 12215d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); 12225d4f98a2SYan Zheng BUG_ON(ret); 12233fd0a558SYan, Zheng } 12248bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12255d4f98a2SYan Zheng 12265d4f98a2SYan Zheng if (next_key) { 12275d4f98a2SYan Zheng next_key->objectid = (u64)-1; 12285d4f98a2SYan Zheng next_key->type = (u8)-1; 12295d4f98a2SYan Zheng next_key->offset = (u64)-1; 12305d4f98a2SYan Zheng } 12315d4f98a2SYan Zheng 12325d4f98a2SYan Zheng parent = eb; 12335d4f98a2SYan Zheng while (1) { 1234581c1760SQu Wenruo struct btrfs_key first_key; 1235581c1760SQu Wenruo 12365d4f98a2SYan Zheng level = btrfs_header_level(parent); 12375d4f98a2SYan Zheng BUG_ON(level < lowest_level); 12385d4f98a2SYan Zheng 1239e3b83361SQu Wenruo ret = btrfs_bin_search(parent, &key, &slot); 1240cbca7d59SFilipe Manana if (ret < 0) 1241cbca7d59SFilipe Manana break; 12425d4f98a2SYan Zheng if (ret && slot > 0) 12435d4f98a2SYan Zheng slot--; 12445d4f98a2SYan Zheng 12455d4f98a2SYan Zheng if (next_key && slot + 1 < btrfs_header_nritems(parent)) 12465d4f98a2SYan Zheng btrfs_node_key_to_cpu(parent, next_key, slot + 1); 12475d4f98a2SYan Zheng 12485d4f98a2SYan Zheng old_bytenr = btrfs_node_blockptr(parent, slot); 12490b246afaSJeff Mahoney blocksize = fs_info->nodesize; 12505d4f98a2SYan Zheng old_ptr_gen = btrfs_node_ptr_generation(parent, slot); 125117515f1bSQu Wenruo btrfs_node_key_to_cpu(parent, &first_key, slot); 12525d4f98a2SYan Zheng 12535d4f98a2SYan Zheng if (level <= max_level) { 12545d4f98a2SYan Zheng eb = path->nodes[level]; 12555d4f98a2SYan Zheng new_bytenr = btrfs_node_blockptr(eb, 12565d4f98a2SYan Zheng path->slots[level]); 12575d4f98a2SYan Zheng new_ptr_gen = btrfs_node_ptr_generation(eb, 12585d4f98a2SYan Zheng path->slots[level]); 12595d4f98a2SYan Zheng } else { 12605d4f98a2SYan Zheng new_bytenr = 0; 12615d4f98a2SYan Zheng new_ptr_gen = 0; 12625d4f98a2SYan Zheng } 12635d4f98a2SYan Zheng 1264fae7f21cSDulshani Gunawardhana if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) { 12655d4f98a2SYan Zheng ret = level; 12665d4f98a2SYan Zheng break; 12675d4f98a2SYan Zheng } 12685d4f98a2SYan Zheng 12695d4f98a2SYan Zheng if (new_bytenr == 0 || old_ptr_gen > last_snapshot || 12705d4f98a2SYan Zheng memcmp_node_keys(parent, slot, path, level)) { 12713fd0a558SYan, Zheng if (level <= lowest_level) { 12725d4f98a2SYan Zheng ret = 0; 12735d4f98a2SYan Zheng break; 12745d4f98a2SYan Zheng } 12755d4f98a2SYan Zheng 1276581c1760SQu Wenruo eb = read_tree_block(fs_info, old_bytenr, old_ptr_gen, 1277581c1760SQu Wenruo level - 1, &first_key); 127864c043deSLiu Bo if (IS_ERR(eb)) { 127964c043deSLiu Bo ret = PTR_ERR(eb); 1280264813acSLiu Bo break; 128164c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 128264c043deSLiu Bo ret = -EIO; 1283416bc658SJosef Bacik free_extent_buffer(eb); 1284379cde74SStefan Behrens break; 1285416bc658SJosef Bacik } 12865d4f98a2SYan Zheng btrfs_tree_lock(eb); 12873fd0a558SYan, Zheng if (cow) { 12885d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, parent, 12895d4f98a2SYan Zheng slot, &eb); 12905d4f98a2SYan Zheng BUG_ON(ret); 12915d4f98a2SYan Zheng } 12928bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 12935d4f98a2SYan Zheng 12945d4f98a2SYan Zheng btrfs_tree_unlock(parent); 12955d4f98a2SYan Zheng free_extent_buffer(parent); 12965d4f98a2SYan Zheng 12975d4f98a2SYan Zheng parent = eb; 12985d4f98a2SYan Zheng continue; 12995d4f98a2SYan Zheng } 13005d4f98a2SYan Zheng 13013fd0a558SYan, Zheng if (!cow) { 13023fd0a558SYan, Zheng btrfs_tree_unlock(parent); 13033fd0a558SYan, Zheng free_extent_buffer(parent); 13043fd0a558SYan, Zheng cow = 1; 13053fd0a558SYan, Zheng goto again; 13063fd0a558SYan, Zheng } 13073fd0a558SYan, Zheng 13085d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 13095d4f98a2SYan Zheng path->slots[level]); 1310b3b4aa74SDavid Sterba btrfs_release_path(path); 13115d4f98a2SYan Zheng 13125d4f98a2SYan Zheng path->lowest_level = level; 13135d4f98a2SYan Zheng ret = btrfs_search_slot(trans, src, &key, path, 0, 1); 13145d4f98a2SYan Zheng path->lowest_level = 0; 13155d4f98a2SYan Zheng BUG_ON(ret); 13165d4f98a2SYan Zheng 13175d4f98a2SYan Zheng /* 1318824d8dffSQu Wenruo * Info qgroup to trace both subtrees. 1319824d8dffSQu Wenruo * 1320824d8dffSQu Wenruo * We must trace both trees. 1321824d8dffSQu Wenruo * 1) Tree reloc subtree 1322824d8dffSQu Wenruo * If not traced, we will leak data numbers 1323824d8dffSQu Wenruo * 2) Fs subtree 1324824d8dffSQu Wenruo * If not traced, we will double count old data 1325f616f5cdSQu Wenruo * 1326f616f5cdSQu Wenruo * We don't scan the subtree right now, but only record 1327f616f5cdSQu Wenruo * the swapped tree blocks. 1328f616f5cdSQu Wenruo * The real subtree rescan is delayed until we have new 1329f616f5cdSQu Wenruo * CoW on the subtree root node before transaction commit. 1330824d8dffSQu Wenruo */ 1331370a11b8SQu Wenruo ret = btrfs_qgroup_add_swapped_blocks(trans, dest, 1332370a11b8SQu Wenruo rc->block_group, parent, slot, 1333370a11b8SQu Wenruo path->nodes[level], path->slots[level], 1334370a11b8SQu Wenruo last_snapshot); 1335370a11b8SQu Wenruo if (ret < 0) 1336370a11b8SQu Wenruo break; 1337824d8dffSQu Wenruo /* 13385d4f98a2SYan Zheng * swap blocks in fs tree and reloc tree. 13395d4f98a2SYan Zheng */ 13405d4f98a2SYan Zheng btrfs_set_node_blockptr(parent, slot, new_bytenr); 13415d4f98a2SYan Zheng btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); 13425d4f98a2SYan Zheng btrfs_mark_buffer_dirty(parent); 13435d4f98a2SYan Zheng 13445d4f98a2SYan Zheng btrfs_set_node_blockptr(path->nodes[level], 13455d4f98a2SYan Zheng path->slots[level], old_bytenr); 13465d4f98a2SYan Zheng btrfs_set_node_ptr_generation(path->nodes[level], 13475d4f98a2SYan Zheng path->slots[level], old_ptr_gen); 13485d4f98a2SYan Zheng btrfs_mark_buffer_dirty(path->nodes[level]); 13495d4f98a2SYan Zheng 135082fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr, 135182fa113fSQu Wenruo blocksize, path->nodes[level]->start); 135282fa113fSQu Wenruo ref.skip_qgroup = true; 135382fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 135482fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 13555d4f98a2SYan Zheng BUG_ON(ret); 135682fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr, 135782fa113fSQu Wenruo blocksize, 0); 135882fa113fSQu Wenruo ref.skip_qgroup = true; 135982fa113fSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 136082fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 13615d4f98a2SYan Zheng BUG_ON(ret); 13625d4f98a2SYan Zheng 1363ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, new_bytenr, 1364ffd4bb2aSQu Wenruo blocksize, path->nodes[level]->start); 1365ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid); 1366ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1367ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 13685d4f98a2SYan Zheng BUG_ON(ret); 13695d4f98a2SYan Zheng 1370ffd4bb2aSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, old_bytenr, 1371ffd4bb2aSQu Wenruo blocksize, 0); 1372ffd4bb2aSQu Wenruo btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid); 1373ffd4bb2aSQu Wenruo ref.skip_qgroup = true; 1374ffd4bb2aSQu Wenruo ret = btrfs_free_extent(trans, &ref); 13755d4f98a2SYan Zheng BUG_ON(ret); 13765d4f98a2SYan Zheng 13775d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 13785d4f98a2SYan Zheng 13795d4f98a2SYan Zheng ret = level; 13805d4f98a2SYan Zheng break; 13815d4f98a2SYan Zheng } 13825d4f98a2SYan Zheng btrfs_tree_unlock(parent); 13835d4f98a2SYan Zheng free_extent_buffer(parent); 13845d4f98a2SYan Zheng return ret; 13855d4f98a2SYan Zheng } 13865d4f98a2SYan Zheng 13875d4f98a2SYan Zheng /* 13885d4f98a2SYan Zheng * helper to find next relocated block in reloc tree 13895d4f98a2SYan Zheng */ 13905d4f98a2SYan Zheng static noinline_for_stack 13915d4f98a2SYan Zheng int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 13925d4f98a2SYan Zheng int *level) 13935d4f98a2SYan Zheng { 13945d4f98a2SYan Zheng struct extent_buffer *eb; 13955d4f98a2SYan Zheng int i; 13965d4f98a2SYan Zheng u64 last_snapshot; 13975d4f98a2SYan Zheng u32 nritems; 13985d4f98a2SYan Zheng 13995d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 14005d4f98a2SYan Zheng 14015d4f98a2SYan Zheng for (i = 0; i < *level; i++) { 14025d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 14035d4f98a2SYan Zheng path->nodes[i] = NULL; 14045d4f98a2SYan Zheng } 14055d4f98a2SYan Zheng 14065d4f98a2SYan Zheng for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { 14075d4f98a2SYan Zheng eb = path->nodes[i]; 14085d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 14095d4f98a2SYan Zheng while (path->slots[i] + 1 < nritems) { 14105d4f98a2SYan Zheng path->slots[i]++; 14115d4f98a2SYan Zheng if (btrfs_node_ptr_generation(eb, path->slots[i]) <= 14125d4f98a2SYan Zheng last_snapshot) 14135d4f98a2SYan Zheng continue; 14145d4f98a2SYan Zheng 14155d4f98a2SYan Zheng *level = i; 14165d4f98a2SYan Zheng return 0; 14175d4f98a2SYan Zheng } 14185d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 14195d4f98a2SYan Zheng path->nodes[i] = NULL; 14205d4f98a2SYan Zheng } 14215d4f98a2SYan Zheng return 1; 14225d4f98a2SYan Zheng } 14235d4f98a2SYan Zheng 14245d4f98a2SYan Zheng /* 14255d4f98a2SYan Zheng * walk down reloc tree to find relocated block of lowest level 14265d4f98a2SYan Zheng */ 14275d4f98a2SYan Zheng static noinline_for_stack 14285d4f98a2SYan Zheng int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 14295d4f98a2SYan Zheng int *level) 14305d4f98a2SYan Zheng { 14312ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 14325d4f98a2SYan Zheng struct extent_buffer *eb = NULL; 14335d4f98a2SYan Zheng int i; 14345d4f98a2SYan Zheng u64 bytenr; 14355d4f98a2SYan Zheng u64 ptr_gen = 0; 14365d4f98a2SYan Zheng u64 last_snapshot; 14375d4f98a2SYan Zheng u32 nritems; 14385d4f98a2SYan Zheng 14395d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 14405d4f98a2SYan Zheng 14415d4f98a2SYan Zheng for (i = *level; i > 0; i--) { 1442581c1760SQu Wenruo struct btrfs_key first_key; 1443581c1760SQu Wenruo 14445d4f98a2SYan Zheng eb = path->nodes[i]; 14455d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 14465d4f98a2SYan Zheng while (path->slots[i] < nritems) { 14475d4f98a2SYan Zheng ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); 14485d4f98a2SYan Zheng if (ptr_gen > last_snapshot) 14495d4f98a2SYan Zheng break; 14505d4f98a2SYan Zheng path->slots[i]++; 14515d4f98a2SYan Zheng } 14525d4f98a2SYan Zheng if (path->slots[i] >= nritems) { 14535d4f98a2SYan Zheng if (i == *level) 14545d4f98a2SYan Zheng break; 14555d4f98a2SYan Zheng *level = i + 1; 14565d4f98a2SYan Zheng return 0; 14575d4f98a2SYan Zheng } 14585d4f98a2SYan Zheng if (i == 1) { 14595d4f98a2SYan Zheng *level = i; 14605d4f98a2SYan Zheng return 0; 14615d4f98a2SYan Zheng } 14625d4f98a2SYan Zheng 14635d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(eb, path->slots[i]); 1464581c1760SQu Wenruo btrfs_node_key_to_cpu(eb, &first_key, path->slots[i]); 1465581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, ptr_gen, i - 1, 1466581c1760SQu Wenruo &first_key); 146764c043deSLiu Bo if (IS_ERR(eb)) { 146864c043deSLiu Bo return PTR_ERR(eb); 146964c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 1470416bc658SJosef Bacik free_extent_buffer(eb); 1471416bc658SJosef Bacik return -EIO; 1472416bc658SJosef Bacik } 14735d4f98a2SYan Zheng BUG_ON(btrfs_header_level(eb) != i - 1); 14745d4f98a2SYan Zheng path->nodes[i - 1] = eb; 14755d4f98a2SYan Zheng path->slots[i - 1] = 0; 14765d4f98a2SYan Zheng } 14775d4f98a2SYan Zheng return 1; 14785d4f98a2SYan Zheng } 14795d4f98a2SYan Zheng 14805d4f98a2SYan Zheng /* 14815d4f98a2SYan Zheng * invalidate extent cache for file extents whose key in range of 14825d4f98a2SYan Zheng * [min_key, max_key) 14835d4f98a2SYan Zheng */ 14845d4f98a2SYan Zheng static int invalidate_extent_cache(struct btrfs_root *root, 14855d4f98a2SYan Zheng struct btrfs_key *min_key, 14865d4f98a2SYan Zheng struct btrfs_key *max_key) 14875d4f98a2SYan Zheng { 14880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 14895d4f98a2SYan Zheng struct inode *inode = NULL; 14905d4f98a2SYan Zheng u64 objectid; 14915d4f98a2SYan Zheng u64 start, end; 149233345d01SLi Zefan u64 ino; 14935d4f98a2SYan Zheng 14945d4f98a2SYan Zheng objectid = min_key->objectid; 14955d4f98a2SYan Zheng while (1) { 14965d4f98a2SYan Zheng cond_resched(); 14975d4f98a2SYan Zheng iput(inode); 14985d4f98a2SYan Zheng 14995d4f98a2SYan Zheng if (objectid > max_key->objectid) 15005d4f98a2SYan Zheng break; 15015d4f98a2SYan Zheng 15025d4f98a2SYan Zheng inode = find_next_inode(root, objectid); 15035d4f98a2SYan Zheng if (!inode) 15045d4f98a2SYan Zheng break; 15054a0cc7caSNikolay Borisov ino = btrfs_ino(BTRFS_I(inode)); 15065d4f98a2SYan Zheng 150733345d01SLi Zefan if (ino > max_key->objectid) { 15085d4f98a2SYan Zheng iput(inode); 15095d4f98a2SYan Zheng break; 15105d4f98a2SYan Zheng } 15115d4f98a2SYan Zheng 151233345d01SLi Zefan objectid = ino + 1; 15135d4f98a2SYan Zheng if (!S_ISREG(inode->i_mode)) 15145d4f98a2SYan Zheng continue; 15155d4f98a2SYan Zheng 151633345d01SLi Zefan if (unlikely(min_key->objectid == ino)) { 15175d4f98a2SYan Zheng if (min_key->type > BTRFS_EXTENT_DATA_KEY) 15185d4f98a2SYan Zheng continue; 15195d4f98a2SYan Zheng if (min_key->type < BTRFS_EXTENT_DATA_KEY) 15205d4f98a2SYan Zheng start = 0; 15215d4f98a2SYan Zheng else { 15225d4f98a2SYan Zheng start = min_key->offset; 15230b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(start, fs_info->sectorsize)); 15245d4f98a2SYan Zheng } 15255d4f98a2SYan Zheng } else { 15265d4f98a2SYan Zheng start = 0; 15275d4f98a2SYan Zheng } 15285d4f98a2SYan Zheng 152933345d01SLi Zefan if (unlikely(max_key->objectid == ino)) { 15305d4f98a2SYan Zheng if (max_key->type < BTRFS_EXTENT_DATA_KEY) 15315d4f98a2SYan Zheng continue; 15325d4f98a2SYan Zheng if (max_key->type > BTRFS_EXTENT_DATA_KEY) { 15335d4f98a2SYan Zheng end = (u64)-1; 15345d4f98a2SYan Zheng } else { 15355d4f98a2SYan Zheng if (max_key->offset == 0) 15365d4f98a2SYan Zheng continue; 15375d4f98a2SYan Zheng end = max_key->offset; 15380b246afaSJeff Mahoney WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize)); 15395d4f98a2SYan Zheng end--; 15405d4f98a2SYan Zheng } 15415d4f98a2SYan Zheng } else { 15425d4f98a2SYan Zheng end = (u64)-1; 15435d4f98a2SYan Zheng } 15445d4f98a2SYan Zheng 15455d4f98a2SYan Zheng /* the lock_extent waits for readpage to complete */ 1546d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 1547dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 1); 1548d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 15495d4f98a2SYan Zheng } 15505d4f98a2SYan Zheng return 0; 15515d4f98a2SYan Zheng } 15525d4f98a2SYan Zheng 15535d4f98a2SYan Zheng static int find_next_key(struct btrfs_path *path, int level, 15545d4f98a2SYan Zheng struct btrfs_key *key) 15555d4f98a2SYan Zheng 15565d4f98a2SYan Zheng { 15575d4f98a2SYan Zheng while (level < BTRFS_MAX_LEVEL) { 15585d4f98a2SYan Zheng if (!path->nodes[level]) 15595d4f98a2SYan Zheng break; 15605d4f98a2SYan Zheng if (path->slots[level] + 1 < 15615d4f98a2SYan Zheng btrfs_header_nritems(path->nodes[level])) { 15625d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], key, 15635d4f98a2SYan Zheng path->slots[level] + 1); 15645d4f98a2SYan Zheng return 0; 15655d4f98a2SYan Zheng } 15665d4f98a2SYan Zheng level++; 15675d4f98a2SYan Zheng } 15685d4f98a2SYan Zheng return 1; 15695d4f98a2SYan Zheng } 15705d4f98a2SYan Zheng 15715d4f98a2SYan Zheng /* 1572d2311e69SQu Wenruo * Insert current subvolume into reloc_control::dirty_subvol_roots 1573d2311e69SQu Wenruo */ 1574d2311e69SQu Wenruo static void insert_dirty_subvol(struct btrfs_trans_handle *trans, 1575d2311e69SQu Wenruo struct reloc_control *rc, 1576d2311e69SQu Wenruo struct btrfs_root *root) 1577d2311e69SQu Wenruo { 1578d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1579d2311e69SQu Wenruo struct btrfs_root_item *reloc_root_item; 1580d2311e69SQu Wenruo 1581d2311e69SQu Wenruo /* @root must be a subvolume tree root with a valid reloc tree */ 1582d2311e69SQu Wenruo ASSERT(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 1583d2311e69SQu Wenruo ASSERT(reloc_root); 1584d2311e69SQu Wenruo 1585d2311e69SQu Wenruo reloc_root_item = &reloc_root->root_item; 1586d2311e69SQu Wenruo memset(&reloc_root_item->drop_progress, 0, 1587d2311e69SQu Wenruo sizeof(reloc_root_item->drop_progress)); 1588d2311e69SQu Wenruo reloc_root_item->drop_level = 0; 1589d2311e69SQu Wenruo btrfs_set_root_refs(reloc_root_item, 0); 1590d2311e69SQu Wenruo btrfs_update_reloc_root(trans, root); 1591d2311e69SQu Wenruo 1592d2311e69SQu Wenruo if (list_empty(&root->reloc_dirty_list)) { 159300246528SJosef Bacik btrfs_grab_root(root); 1594d2311e69SQu Wenruo list_add_tail(&root->reloc_dirty_list, &rc->dirty_subvol_roots); 1595d2311e69SQu Wenruo } 1596d2311e69SQu Wenruo } 1597d2311e69SQu Wenruo 1598d2311e69SQu Wenruo static int clean_dirty_subvols(struct reloc_control *rc) 1599d2311e69SQu Wenruo { 1600d2311e69SQu Wenruo struct btrfs_root *root; 1601d2311e69SQu Wenruo struct btrfs_root *next; 1602d2311e69SQu Wenruo int ret = 0; 160330d40577SQu Wenruo int ret2; 1604d2311e69SQu Wenruo 1605d2311e69SQu Wenruo list_for_each_entry_safe(root, next, &rc->dirty_subvol_roots, 1606d2311e69SQu Wenruo reloc_dirty_list) { 160730d40577SQu Wenruo if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 160830d40577SQu Wenruo /* Merged subvolume, cleanup its reloc root */ 1609d2311e69SQu Wenruo struct btrfs_root *reloc_root = root->reloc_root; 1610d2311e69SQu Wenruo 1611d2311e69SQu Wenruo list_del_init(&root->reloc_dirty_list); 1612d2311e69SQu Wenruo root->reloc_root = NULL; 16136282675eSQu Wenruo /* 16146282675eSQu Wenruo * Need barrier to ensure clear_bit() only happens after 16156282675eSQu Wenruo * root->reloc_root = NULL. Pairs with have_reloc_root. 16166282675eSQu Wenruo */ 16176282675eSQu Wenruo smp_wmb(); 16181fac4a54SQu Wenruo clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state); 1619f28de8d8SJosef Bacik if (reloc_root) { 1620f44deb74SJosef Bacik /* 1621f44deb74SJosef Bacik * btrfs_drop_snapshot drops our ref we hold for 1622f44deb74SJosef Bacik * ->reloc_root. If it fails however we must 1623f44deb74SJosef Bacik * drop the ref ourselves. 1624f44deb74SJosef Bacik */ 1625f28de8d8SJosef Bacik ret2 = btrfs_drop_snapshot(reloc_root, 0, 1); 1626f44deb74SJosef Bacik if (ret2 < 0) { 1627f44deb74SJosef Bacik btrfs_put_root(reloc_root); 1628f44deb74SJosef Bacik if (!ret) 1629f28de8d8SJosef Bacik ret = ret2; 1630f28de8d8SJosef Bacik } 1631f44deb74SJosef Bacik } 163200246528SJosef Bacik btrfs_put_root(root); 163330d40577SQu Wenruo } else { 163430d40577SQu Wenruo /* Orphan reloc tree, just clean it up */ 16350078a9f9SNikolay Borisov ret2 = btrfs_drop_snapshot(root, 0, 1); 1636f44deb74SJosef Bacik if (ret2 < 0) { 1637f44deb74SJosef Bacik btrfs_put_root(root); 1638f44deb74SJosef Bacik if (!ret) 163930d40577SQu Wenruo ret = ret2; 164030d40577SQu Wenruo } 1641d2311e69SQu Wenruo } 1642f44deb74SJosef Bacik } 1643d2311e69SQu Wenruo return ret; 1644d2311e69SQu Wenruo } 1645d2311e69SQu Wenruo 1646d2311e69SQu Wenruo /* 16475d4f98a2SYan Zheng * merge the relocated tree blocks in reloc tree with corresponding 16485d4f98a2SYan Zheng * fs tree. 16495d4f98a2SYan Zheng */ 16505d4f98a2SYan Zheng static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, 16515d4f98a2SYan Zheng struct btrfs_root *root) 16525d4f98a2SYan Zheng { 16530b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 16545d4f98a2SYan Zheng struct btrfs_key key; 16555d4f98a2SYan Zheng struct btrfs_key next_key; 16569e6a0c52SJosef Bacik struct btrfs_trans_handle *trans = NULL; 16575d4f98a2SYan Zheng struct btrfs_root *reloc_root; 16585d4f98a2SYan Zheng struct btrfs_root_item *root_item; 16595d4f98a2SYan Zheng struct btrfs_path *path; 16603fd0a558SYan, Zheng struct extent_buffer *leaf; 16615d4f98a2SYan Zheng int level; 16625d4f98a2SYan Zheng int max_level; 16635d4f98a2SYan Zheng int replaced = 0; 16645d4f98a2SYan Zheng int ret; 16655d4f98a2SYan Zheng int err = 0; 16663fd0a558SYan, Zheng u32 min_reserved; 16675d4f98a2SYan Zheng 16685d4f98a2SYan Zheng path = btrfs_alloc_path(); 16695d4f98a2SYan Zheng if (!path) 16705d4f98a2SYan Zheng return -ENOMEM; 1671e4058b54SDavid Sterba path->reada = READA_FORWARD; 16725d4f98a2SYan Zheng 16735d4f98a2SYan Zheng reloc_root = root->reloc_root; 16745d4f98a2SYan Zheng root_item = &reloc_root->root_item; 16755d4f98a2SYan Zheng 16765d4f98a2SYan Zheng if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { 16775d4f98a2SYan Zheng level = btrfs_root_level(root_item); 167867439dadSDavid Sterba atomic_inc(&reloc_root->node->refs); 16795d4f98a2SYan Zheng path->nodes[level] = reloc_root->node; 16805d4f98a2SYan Zheng path->slots[level] = 0; 16815d4f98a2SYan Zheng } else { 16825d4f98a2SYan Zheng btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); 16835d4f98a2SYan Zheng 16845d4f98a2SYan Zheng level = root_item->drop_level; 16855d4f98a2SYan Zheng BUG_ON(level == 0); 16865d4f98a2SYan Zheng path->lowest_level = level; 16875d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); 168833c66f43SYan Zheng path->lowest_level = 0; 16895d4f98a2SYan Zheng if (ret < 0) { 16905d4f98a2SYan Zheng btrfs_free_path(path); 16915d4f98a2SYan Zheng return ret; 16925d4f98a2SYan Zheng } 16935d4f98a2SYan Zheng 16945d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &next_key, 16955d4f98a2SYan Zheng path->slots[level]); 16965d4f98a2SYan Zheng WARN_ON(memcmp(&key, &next_key, sizeof(key))); 16975d4f98a2SYan Zheng 16985d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 16995d4f98a2SYan Zheng } 17005d4f98a2SYan Zheng 17010b246afaSJeff Mahoney min_reserved = fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 17025d4f98a2SYan Zheng memset(&next_key, 0, sizeof(next_key)); 17035d4f98a2SYan Zheng 17045d4f98a2SYan Zheng while (1) { 170508e007d2SMiao Xie ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, 170608e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 17073fd0a558SYan, Zheng if (ret) { 17089e6a0c52SJosef Bacik err = ret; 17099e6a0c52SJosef Bacik goto out; 17103fd0a558SYan, Zheng } 17119e6a0c52SJosef Bacik trans = btrfs_start_transaction(root, 0); 17129e6a0c52SJosef Bacik if (IS_ERR(trans)) { 17139e6a0c52SJosef Bacik err = PTR_ERR(trans); 17149e6a0c52SJosef Bacik trans = NULL; 17159e6a0c52SJosef Bacik goto out; 17169e6a0c52SJosef Bacik } 17172abc726aSJosef Bacik 17182abc726aSJosef Bacik /* 17192abc726aSJosef Bacik * At this point we no longer have a reloc_control, so we can't 17202abc726aSJosef Bacik * depend on btrfs_init_reloc_root to update our last_trans. 17212abc726aSJosef Bacik * 17222abc726aSJosef Bacik * But that's ok, we started the trans handle on our 17232abc726aSJosef Bacik * corresponding fs_root, which means it's been added to the 17242abc726aSJosef Bacik * dirty list. At commit time we'll still call 17252abc726aSJosef Bacik * btrfs_update_reloc_root() and update our root item 17262abc726aSJosef Bacik * appropriately. 17272abc726aSJosef Bacik */ 17282abc726aSJosef Bacik reloc_root->last_trans = trans->transid; 17299e6a0c52SJosef Bacik trans->block_rsv = rc->block_rsv; 17303fd0a558SYan, Zheng 17313fd0a558SYan, Zheng replaced = 0; 17325d4f98a2SYan Zheng max_level = level; 17335d4f98a2SYan Zheng 17345d4f98a2SYan Zheng ret = walk_down_reloc_tree(reloc_root, path, &level); 17355d4f98a2SYan Zheng if (ret < 0) { 17365d4f98a2SYan Zheng err = ret; 17375d4f98a2SYan Zheng goto out; 17385d4f98a2SYan Zheng } 17395d4f98a2SYan Zheng if (ret > 0) 17405d4f98a2SYan Zheng break; 17415d4f98a2SYan Zheng 17425d4f98a2SYan Zheng if (!find_next_key(path, level, &key) && 17435d4f98a2SYan Zheng btrfs_comp_cpu_keys(&next_key, &key) >= 0) { 17445d4f98a2SYan Zheng ret = 0; 17455d4f98a2SYan Zheng } else { 17463d0174f7SQu Wenruo ret = replace_path(trans, rc, root, reloc_root, path, 17473fd0a558SYan, Zheng &next_key, level, max_level); 17485d4f98a2SYan Zheng } 17495d4f98a2SYan Zheng if (ret < 0) { 17505d4f98a2SYan Zheng err = ret; 17515d4f98a2SYan Zheng goto out; 17525d4f98a2SYan Zheng } 17535d4f98a2SYan Zheng 17545d4f98a2SYan Zheng if (ret > 0) { 17555d4f98a2SYan Zheng level = ret; 17565d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 17575d4f98a2SYan Zheng path->slots[level]); 17585d4f98a2SYan Zheng replaced = 1; 17595d4f98a2SYan Zheng } 17605d4f98a2SYan Zheng 17615d4f98a2SYan Zheng ret = walk_up_reloc_tree(reloc_root, path, &level); 17625d4f98a2SYan Zheng if (ret > 0) 17635d4f98a2SYan Zheng break; 17645d4f98a2SYan Zheng 17655d4f98a2SYan Zheng BUG_ON(level == 0); 17665d4f98a2SYan Zheng /* 17675d4f98a2SYan Zheng * save the merging progress in the drop_progress. 17685d4f98a2SYan Zheng * this is OK since root refs == 1 in this case. 17695d4f98a2SYan Zheng */ 17705d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &root_item->drop_progress, 17715d4f98a2SYan Zheng path->slots[level]); 17725d4f98a2SYan Zheng root_item->drop_level = level; 17735d4f98a2SYan Zheng 17743a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 17759e6a0c52SJosef Bacik trans = NULL; 17765d4f98a2SYan Zheng 17772ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 17785d4f98a2SYan Zheng 17795d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 17805d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 17815d4f98a2SYan Zheng } 17825d4f98a2SYan Zheng 17835d4f98a2SYan Zheng /* 17845d4f98a2SYan Zheng * handle the case only one block in the fs tree need to be 17855d4f98a2SYan Zheng * relocated and the block is tree root. 17865d4f98a2SYan Zheng */ 17875d4f98a2SYan Zheng leaf = btrfs_lock_root_node(root); 17885d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); 17895d4f98a2SYan Zheng btrfs_tree_unlock(leaf); 17905d4f98a2SYan Zheng free_extent_buffer(leaf); 17915d4f98a2SYan Zheng if (ret < 0) 17925d4f98a2SYan Zheng err = ret; 17935d4f98a2SYan Zheng out: 17945d4f98a2SYan Zheng btrfs_free_path(path); 17955d4f98a2SYan Zheng 1796d2311e69SQu Wenruo if (err == 0) 1797d2311e69SQu Wenruo insert_dirty_subvol(trans, rc, root); 17985d4f98a2SYan Zheng 17999e6a0c52SJosef Bacik if (trans) 18003a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 18015d4f98a2SYan Zheng 18022ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 18035d4f98a2SYan Zheng 18045d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 18055d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 18065d4f98a2SYan Zheng 18075d4f98a2SYan Zheng return err; 18085d4f98a2SYan Zheng } 18095d4f98a2SYan Zheng 18103fd0a558SYan, Zheng static noinline_for_stack 18113fd0a558SYan, Zheng int prepare_to_merge(struct reloc_control *rc, int err) 18125d4f98a2SYan Zheng { 18133fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 18140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 18153fd0a558SYan, Zheng struct btrfs_root *reloc_root; 18165d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 18173fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 18183fd0a558SYan, Zheng u64 num_bytes = 0; 18193fd0a558SYan, Zheng int ret; 18203fd0a558SYan, Zheng 18210b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 18220b246afaSJeff Mahoney rc->merging_rsv_size += fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 18233fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated * 2; 18240b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 18257585717fSChris Mason 18263fd0a558SYan, Zheng again: 18273fd0a558SYan, Zheng if (!err) { 18283fd0a558SYan, Zheng num_bytes = rc->merging_rsv_size; 182908e007d2SMiao Xie ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, 183008e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 18313fd0a558SYan, Zheng if (ret) 18323fd0a558SYan, Zheng err = ret; 18333fd0a558SYan, Zheng } 18343fd0a558SYan, Zheng 18357a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 18363612b495STsutomu Itoh if (IS_ERR(trans)) { 18373612b495STsutomu Itoh if (!err) 18382ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 183963f018beSNikolay Borisov num_bytes, NULL); 18403612b495STsutomu Itoh return PTR_ERR(trans); 18413612b495STsutomu Itoh } 18423fd0a558SYan, Zheng 18433fd0a558SYan, Zheng if (!err) { 18443fd0a558SYan, Zheng if (num_bytes != rc->merging_rsv_size) { 18453a45bb20SJeff Mahoney btrfs_end_transaction(trans); 18462ff7e61eSJeff Mahoney btrfs_block_rsv_release(fs_info, rc->block_rsv, 184763f018beSNikolay Borisov num_bytes, NULL); 18483fd0a558SYan, Zheng goto again; 18493fd0a558SYan, Zheng } 18503fd0a558SYan, Zheng } 18513fd0a558SYan, Zheng 18523fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 18533fd0a558SYan, Zheng 18543fd0a558SYan, Zheng while (!list_empty(&rc->reloc_roots)) { 18553fd0a558SYan, Zheng reloc_root = list_entry(rc->reloc_roots.next, 18563fd0a558SYan, Zheng struct btrfs_root, root_list); 18573fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 18583fd0a558SYan, Zheng 18590b246afaSJeff Mahoney root = read_fs_root(fs_info, reloc_root->root_key.offset); 18603fd0a558SYan, Zheng BUG_ON(IS_ERR(root)); 18613fd0a558SYan, Zheng BUG_ON(root->reloc_root != reloc_root); 18623fd0a558SYan, Zheng 18633fd0a558SYan, Zheng /* 18643fd0a558SYan, Zheng * set reference count to 1, so btrfs_recover_relocation 18653fd0a558SYan, Zheng * knows it should resumes merging 18663fd0a558SYan, Zheng */ 18673fd0a558SYan, Zheng if (!err) 18683fd0a558SYan, Zheng btrfs_set_root_refs(&reloc_root->root_item, 1); 18693fd0a558SYan, Zheng btrfs_update_reloc_root(trans, root); 18703fd0a558SYan, Zheng 18713fd0a558SYan, Zheng list_add(&reloc_root->root_list, &reloc_roots); 187200246528SJosef Bacik btrfs_put_root(root); 18733fd0a558SYan, Zheng } 18743fd0a558SYan, Zheng 18753fd0a558SYan, Zheng list_splice(&reloc_roots, &rc->reloc_roots); 18763fd0a558SYan, Zheng 18773fd0a558SYan, Zheng if (!err) 18783a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 18793fd0a558SYan, Zheng else 18803a45bb20SJeff Mahoney btrfs_end_transaction(trans); 18813fd0a558SYan, Zheng return err; 18823fd0a558SYan, Zheng } 18833fd0a558SYan, Zheng 18843fd0a558SYan, Zheng static noinline_for_stack 1885aca1bba6SLiu Bo void free_reloc_roots(struct list_head *list) 1886aca1bba6SLiu Bo { 1887a7571232SNikolay Borisov struct btrfs_root *reloc_root, *tmp; 1888aca1bba6SLiu Bo 1889a7571232SNikolay Borisov list_for_each_entry_safe(reloc_root, tmp, list, root_list) 1890bb166d72SNaohiro Aota __del_reloc_root(reloc_root); 1891aca1bba6SLiu Bo } 1892aca1bba6SLiu Bo 1893aca1bba6SLiu Bo static noinline_for_stack 189494404e82SDavid Sterba void merge_reloc_roots(struct reloc_control *rc) 18953fd0a558SYan, Zheng { 18960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 18975d4f98a2SYan Zheng struct btrfs_root *root; 18985d4f98a2SYan Zheng struct btrfs_root *reloc_root; 18993fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 19003fd0a558SYan, Zheng int found = 0; 1901aca1bba6SLiu Bo int ret = 0; 19023fd0a558SYan, Zheng again: 19033fd0a558SYan, Zheng root = rc->extent_root; 19047585717fSChris Mason 19057585717fSChris Mason /* 19067585717fSChris Mason * this serializes us with btrfs_record_root_in_transaction, 19077585717fSChris Mason * we have to make sure nobody is in the middle of 19087585717fSChris Mason * adding their roots to the list while we are 19097585717fSChris Mason * doing this splice 19107585717fSChris Mason */ 19110b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 19123fd0a558SYan, Zheng list_splice_init(&rc->reloc_roots, &reloc_roots); 19130b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 19145d4f98a2SYan Zheng 19153fd0a558SYan, Zheng while (!list_empty(&reloc_roots)) { 19163fd0a558SYan, Zheng found = 1; 19173fd0a558SYan, Zheng reloc_root = list_entry(reloc_roots.next, 19183fd0a558SYan, Zheng struct btrfs_root, root_list); 19195d4f98a2SYan Zheng 192051415b6cSQu Wenruo root = read_fs_root(fs_info, reloc_root->root_key.offset); 19215d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 19225d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 19235d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 19243fd0a558SYan, Zheng ret = merge_reloc_root(rc, root); 192500246528SJosef Bacik btrfs_put_root(root); 1926b37b39cdSJosef Bacik if (ret) { 192725e293c2SWang Shilong if (list_empty(&reloc_root->root_list)) 192825e293c2SWang Shilong list_add_tail(&reloc_root->root_list, 192925e293c2SWang Shilong &reloc_roots); 1930aca1bba6SLiu Bo goto out; 1931b37b39cdSJosef Bacik } 19323fd0a558SYan, Zheng } else { 193351415b6cSQu Wenruo if (!IS_ERR(root)) { 193451415b6cSQu Wenruo if (root->reloc_root == reloc_root) { 193551415b6cSQu Wenruo root->reloc_root = NULL; 193651415b6cSQu Wenruo btrfs_put_root(reloc_root); 193751415b6cSQu Wenruo } 193851415b6cSQu Wenruo btrfs_put_root(root); 193951415b6cSQu Wenruo } 194051415b6cSQu Wenruo 19413fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 194230d40577SQu Wenruo /* Don't forget to queue this reloc root for cleanup */ 194330d40577SQu Wenruo list_add_tail(&reloc_root->reloc_dirty_list, 194430d40577SQu Wenruo &rc->dirty_subvol_roots); 19453fd0a558SYan, Zheng } 19465d4f98a2SYan Zheng } 19475d4f98a2SYan Zheng 19483fd0a558SYan, Zheng if (found) { 19493fd0a558SYan, Zheng found = 0; 19503fd0a558SYan, Zheng goto again; 19515d4f98a2SYan Zheng } 1952aca1bba6SLiu Bo out: 1953aca1bba6SLiu Bo if (ret) { 19540b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, ret, NULL); 1955aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 1956467bb1d2SWang Shilong 1957467bb1d2SWang Shilong /* new reloc root may be added */ 19580b246afaSJeff Mahoney mutex_lock(&fs_info->reloc_mutex); 1959467bb1d2SWang Shilong list_splice_init(&rc->reloc_roots, &reloc_roots); 19600b246afaSJeff Mahoney mutex_unlock(&fs_info->reloc_mutex); 1961467bb1d2SWang Shilong free_reloc_roots(&reloc_roots); 1962aca1bba6SLiu Bo } 1963aca1bba6SLiu Bo 19647b7b7431SJosef Bacik /* 19657b7b7431SJosef Bacik * We used to have 19667b7b7431SJosef Bacik * 19677b7b7431SJosef Bacik * BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); 19687b7b7431SJosef Bacik * 19697b7b7431SJosef Bacik * here, but it's wrong. If we fail to start the transaction in 19707b7b7431SJosef Bacik * prepare_to_merge() we will have only 0 ref reloc roots, none of which 19717b7b7431SJosef Bacik * have actually been removed from the reloc_root_tree rb tree. This is 19727b7b7431SJosef Bacik * fine because we're bailing here, and we hold a reference on the root 19737b7b7431SJosef Bacik * for the list that holds it, so these roots will be cleaned up when we 19747b7b7431SJosef Bacik * do the reloc_dirty_list afterwards. Meanwhile the root->reloc_root 19757b7b7431SJosef Bacik * will be cleaned up on unmount. 19767b7b7431SJosef Bacik * 19777b7b7431SJosef Bacik * The remaining nodes will be cleaned up by free_reloc_control. 19787b7b7431SJosef Bacik */ 19795d4f98a2SYan Zheng } 19805d4f98a2SYan Zheng 19815d4f98a2SYan Zheng static void free_block_list(struct rb_root *blocks) 19825d4f98a2SYan Zheng { 19835d4f98a2SYan Zheng struct tree_block *block; 19845d4f98a2SYan Zheng struct rb_node *rb_node; 19855d4f98a2SYan Zheng while ((rb_node = rb_first(blocks))) { 19865d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 19875d4f98a2SYan Zheng rb_erase(rb_node, blocks); 19885d4f98a2SYan Zheng kfree(block); 19895d4f98a2SYan Zheng } 19905d4f98a2SYan Zheng } 19915d4f98a2SYan Zheng 19925d4f98a2SYan Zheng static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, 19935d4f98a2SYan Zheng struct btrfs_root *reloc_root) 19945d4f98a2SYan Zheng { 19950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = reloc_root->fs_info; 19965d4f98a2SYan Zheng struct btrfs_root *root; 1997442b1ac5SJosef Bacik int ret; 19985d4f98a2SYan Zheng 19995d4f98a2SYan Zheng if (reloc_root->last_trans == trans->transid) 20005d4f98a2SYan Zheng return 0; 20015d4f98a2SYan Zheng 20020b246afaSJeff Mahoney root = read_fs_root(fs_info, reloc_root->root_key.offset); 20035d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 20045d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 2005442b1ac5SJosef Bacik ret = btrfs_record_root_in_trans(trans, root); 200600246528SJosef Bacik btrfs_put_root(root); 20075d4f98a2SYan Zheng 2008442b1ac5SJosef Bacik return ret; 20095d4f98a2SYan Zheng } 20105d4f98a2SYan Zheng 20113fd0a558SYan, Zheng static noinline_for_stack 20123fd0a558SYan, Zheng struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, 20133fd0a558SYan, Zheng struct reloc_control *rc, 2014a26195a5SQu Wenruo struct btrfs_backref_node *node, 2015a26195a5SQu Wenruo struct btrfs_backref_edge *edges[]) 20165d4f98a2SYan Zheng { 2017a26195a5SQu Wenruo struct btrfs_backref_node *next; 20185d4f98a2SYan Zheng struct btrfs_root *root; 20193fd0a558SYan, Zheng int index = 0; 20203fd0a558SYan, Zheng 20215d4f98a2SYan Zheng next = node; 20225d4f98a2SYan Zheng while (1) { 20235d4f98a2SYan Zheng cond_resched(); 20245d4f98a2SYan Zheng next = walk_up_backref(next, edges, &index); 20255d4f98a2SYan Zheng root = next->root; 20263fd0a558SYan, Zheng BUG_ON(!root); 202792a7cc42SQu Wenruo BUG_ON(!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)); 20285d4f98a2SYan Zheng 20295d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { 20305d4f98a2SYan Zheng record_reloc_root_in_trans(trans, root); 20315d4f98a2SYan Zheng break; 20325d4f98a2SYan Zheng } 20335d4f98a2SYan Zheng 20345d4f98a2SYan Zheng btrfs_record_root_in_trans(trans, root); 20353fd0a558SYan, Zheng root = root->reloc_root; 20363fd0a558SYan, Zheng 20373fd0a558SYan, Zheng if (next->new_bytenr != root->node->start) { 20383fd0a558SYan, Zheng BUG_ON(next->new_bytenr); 20393fd0a558SYan, Zheng BUG_ON(!list_empty(&next->list)); 20403fd0a558SYan, Zheng next->new_bytenr = root->node->start; 204100246528SJosef Bacik btrfs_put_root(next->root); 204200246528SJosef Bacik next->root = btrfs_grab_root(root); 20430b530bc5SJosef Bacik ASSERT(next->root); 20443fd0a558SYan, Zheng list_add_tail(&next->list, 20453fd0a558SYan, Zheng &rc->backref_cache.changed); 20469569cc20SQu Wenruo mark_block_processed(rc, next); 20475d4f98a2SYan Zheng break; 20485d4f98a2SYan Zheng } 20495d4f98a2SYan Zheng 20503fd0a558SYan, Zheng WARN_ON(1); 20515d4f98a2SYan Zheng root = NULL; 20525d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 20535d4f98a2SYan Zheng if (!next || next->level <= node->level) 20545d4f98a2SYan Zheng break; 20555d4f98a2SYan Zheng } 20563fd0a558SYan, Zheng if (!root) 20573fd0a558SYan, Zheng return NULL; 20585d4f98a2SYan Zheng 20593fd0a558SYan, Zheng next = node; 20603fd0a558SYan, Zheng /* setup backref node path for btrfs_reloc_cow_block */ 20613fd0a558SYan, Zheng while (1) { 20623fd0a558SYan, Zheng rc->backref_cache.path[next->level] = next; 20633fd0a558SYan, Zheng if (--index < 0) 20643fd0a558SYan, Zheng break; 20653fd0a558SYan, Zheng next = edges[index]->node[UPPER]; 20663fd0a558SYan, Zheng } 20675d4f98a2SYan Zheng return root; 20685d4f98a2SYan Zheng } 20695d4f98a2SYan Zheng 20703fd0a558SYan, Zheng /* 207192a7cc42SQu Wenruo * Select a tree root for relocation. 207292a7cc42SQu Wenruo * 207392a7cc42SQu Wenruo * Return NULL if the block is not shareable. We should use do_relocation() in 207492a7cc42SQu Wenruo * this case. 207592a7cc42SQu Wenruo * 207692a7cc42SQu Wenruo * Return a tree root pointer if the block is shareable. 207792a7cc42SQu Wenruo * Return -ENOENT if the block is root of reloc tree. 20783fd0a558SYan, Zheng */ 20795d4f98a2SYan Zheng static noinline_for_stack 2080a26195a5SQu Wenruo struct btrfs_root *select_one_root(struct btrfs_backref_node *node) 20815d4f98a2SYan Zheng { 2082a26195a5SQu Wenruo struct btrfs_backref_node *next; 20833fd0a558SYan, Zheng struct btrfs_root *root; 20843fd0a558SYan, Zheng struct btrfs_root *fs_root = NULL; 2085a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 20863fd0a558SYan, Zheng int index = 0; 20873fd0a558SYan, Zheng 20883fd0a558SYan, Zheng next = node; 20893fd0a558SYan, Zheng while (1) { 20903fd0a558SYan, Zheng cond_resched(); 20913fd0a558SYan, Zheng next = walk_up_backref(next, edges, &index); 20923fd0a558SYan, Zheng root = next->root; 20933fd0a558SYan, Zheng BUG_ON(!root); 20943fd0a558SYan, Zheng 209592a7cc42SQu Wenruo /* No other choice for non-shareable tree */ 209692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 20973fd0a558SYan, Zheng return root; 20983fd0a558SYan, Zheng 20993fd0a558SYan, Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) 21003fd0a558SYan, Zheng fs_root = root; 21013fd0a558SYan, Zheng 21023fd0a558SYan, Zheng if (next != node) 21033fd0a558SYan, Zheng return NULL; 21043fd0a558SYan, Zheng 21053fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 21063fd0a558SYan, Zheng if (!next || next->level <= node->level) 21073fd0a558SYan, Zheng break; 21083fd0a558SYan, Zheng } 21093fd0a558SYan, Zheng 21103fd0a558SYan, Zheng if (!fs_root) 21113fd0a558SYan, Zheng return ERR_PTR(-ENOENT); 21123fd0a558SYan, Zheng return fs_root; 21135d4f98a2SYan Zheng } 21145d4f98a2SYan Zheng 21155d4f98a2SYan Zheng static noinline_for_stack 21163fd0a558SYan, Zheng u64 calcu_metadata_size(struct reloc_control *rc, 2117a26195a5SQu Wenruo struct btrfs_backref_node *node, int reserve) 21185d4f98a2SYan Zheng { 21190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2120a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2121a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2122a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 21233fd0a558SYan, Zheng u64 num_bytes = 0; 21243fd0a558SYan, Zheng int index = 0; 21255d4f98a2SYan Zheng 21263fd0a558SYan, Zheng BUG_ON(reserve && node->processed); 21273fd0a558SYan, Zheng 21283fd0a558SYan, Zheng while (next) { 21293fd0a558SYan, Zheng cond_resched(); 21305d4f98a2SYan Zheng while (1) { 21313fd0a558SYan, Zheng if (next->processed && (reserve || next != node)) 21325d4f98a2SYan Zheng break; 21335d4f98a2SYan Zheng 21340b246afaSJeff Mahoney num_bytes += fs_info->nodesize; 21353fd0a558SYan, Zheng 21363fd0a558SYan, Zheng if (list_empty(&next->upper)) 21373fd0a558SYan, Zheng break; 21383fd0a558SYan, Zheng 21393fd0a558SYan, Zheng edge = list_entry(next->upper.next, 2140a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 21413fd0a558SYan, Zheng edges[index++] = edge; 21423fd0a558SYan, Zheng next = edge->node[UPPER]; 21435d4f98a2SYan Zheng } 21443fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 21453fd0a558SYan, Zheng } 21463fd0a558SYan, Zheng return num_bytes; 21473fd0a558SYan, Zheng } 21483fd0a558SYan, Zheng 21493fd0a558SYan, Zheng static int reserve_metadata_space(struct btrfs_trans_handle *trans, 21503fd0a558SYan, Zheng struct reloc_control *rc, 2151a26195a5SQu Wenruo struct btrfs_backref_node *node) 21523fd0a558SYan, Zheng { 21533fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 2154da17066cSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 21553fd0a558SYan, Zheng u64 num_bytes; 21563fd0a558SYan, Zheng int ret; 21570647bf56SWang Shilong u64 tmp; 21583fd0a558SYan, Zheng 21593fd0a558SYan, Zheng num_bytes = calcu_metadata_size(rc, node, 1) * 2; 21603fd0a558SYan, Zheng 21613fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 21620647bf56SWang Shilong rc->reserved_bytes += num_bytes; 21638ca17f0fSJosef Bacik 21648ca17f0fSJosef Bacik /* 21658ca17f0fSJosef Bacik * We are under a transaction here so we can only do limited flushing. 21668ca17f0fSJosef Bacik * If we get an enospc just kick back -EAGAIN so we know to drop the 21678ca17f0fSJosef Bacik * transaction and try to refill when we can flush all the things. 21688ca17f0fSJosef Bacik */ 21690647bf56SWang Shilong ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes, 21708ca17f0fSJosef Bacik BTRFS_RESERVE_FLUSH_LIMIT); 21713fd0a558SYan, Zheng if (ret) { 2172da17066cSJeff Mahoney tmp = fs_info->nodesize * RELOCATION_RESERVED_NODES; 21730647bf56SWang Shilong while (tmp <= rc->reserved_bytes) 21740647bf56SWang Shilong tmp <<= 1; 21750647bf56SWang Shilong /* 21760647bf56SWang Shilong * only one thread can access block_rsv at this point, 21770647bf56SWang Shilong * so we don't need hold lock to protect block_rsv. 21780647bf56SWang Shilong * we expand more reservation size here to allow enough 217952042d8eSAndrea Gelmini * space for relocation and we will return earlier in 21800647bf56SWang Shilong * enospc case. 21810647bf56SWang Shilong */ 2182da17066cSJeff Mahoney rc->block_rsv->size = tmp + fs_info->nodesize * 21830647bf56SWang Shilong RELOCATION_RESERVED_NODES; 21848ca17f0fSJosef Bacik return -EAGAIN; 21853fd0a558SYan, Zheng } 21863fd0a558SYan, Zheng 21873fd0a558SYan, Zheng return 0; 21883fd0a558SYan, Zheng } 21893fd0a558SYan, Zheng 21905d4f98a2SYan Zheng /* 21915d4f98a2SYan Zheng * relocate a block tree, and then update pointers in upper level 21925d4f98a2SYan Zheng * blocks that reference the block to point to the new location. 21935d4f98a2SYan Zheng * 21945d4f98a2SYan Zheng * if called by link_to_upper, the block has already been relocated. 21955d4f98a2SYan Zheng * in that case this function just updates pointers. 21965d4f98a2SYan Zheng */ 21975d4f98a2SYan Zheng static int do_relocation(struct btrfs_trans_handle *trans, 21983fd0a558SYan, Zheng struct reloc_control *rc, 2199a26195a5SQu Wenruo struct btrfs_backref_node *node, 22005d4f98a2SYan Zheng struct btrfs_key *key, 22015d4f98a2SYan Zheng struct btrfs_path *path, int lowest) 22025d4f98a2SYan Zheng { 22032ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2204a26195a5SQu Wenruo struct btrfs_backref_node *upper; 2205a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2206a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 22075d4f98a2SYan Zheng struct btrfs_root *root; 22085d4f98a2SYan Zheng struct extent_buffer *eb; 22095d4f98a2SYan Zheng u32 blocksize; 22105d4f98a2SYan Zheng u64 bytenr; 22115d4f98a2SYan Zheng u64 generation; 22125d4f98a2SYan Zheng int slot; 22135d4f98a2SYan Zheng int ret; 22145d4f98a2SYan Zheng int err = 0; 22155d4f98a2SYan Zheng 22165d4f98a2SYan Zheng BUG_ON(lowest && node->eb); 22175d4f98a2SYan Zheng 22185d4f98a2SYan Zheng path->lowest_level = node->level + 1; 22193fd0a558SYan, Zheng rc->backref_cache.path[node->level] = node; 22205d4f98a2SYan Zheng list_for_each_entry(edge, &node->upper, list[LOWER]) { 2221581c1760SQu Wenruo struct btrfs_key first_key; 222282fa113fSQu Wenruo struct btrfs_ref ref = { 0 }; 2223581c1760SQu Wenruo 22245d4f98a2SYan Zheng cond_resched(); 22255d4f98a2SYan Zheng 22265d4f98a2SYan Zheng upper = edge->node[UPPER]; 2227dc4103f9SWang Shilong root = select_reloc_root(trans, rc, upper, edges); 22283fd0a558SYan, Zheng BUG_ON(!root); 22295d4f98a2SYan Zheng 22303fd0a558SYan, Zheng if (upper->eb && !upper->locked) { 22313fd0a558SYan, Zheng if (!lowest) { 2232e3b83361SQu Wenruo ret = btrfs_bin_search(upper->eb, key, &slot); 2233cbca7d59SFilipe Manana if (ret < 0) { 2234cbca7d59SFilipe Manana err = ret; 2235cbca7d59SFilipe Manana goto next; 2236cbca7d59SFilipe Manana } 22373fd0a558SYan, Zheng BUG_ON(ret); 22383fd0a558SYan, Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 22393fd0a558SYan, Zheng if (node->eb->start == bytenr) 22403fd0a558SYan, Zheng goto next; 22413fd0a558SYan, Zheng } 2242b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 22433fd0a558SYan, Zheng } 22445d4f98a2SYan Zheng 22455d4f98a2SYan Zheng if (!upper->eb) { 22465d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 22473561b9dbSLiu Bo if (ret) { 22483561b9dbSLiu Bo if (ret < 0) 22495d4f98a2SYan Zheng err = ret; 22503561b9dbSLiu Bo else 22513561b9dbSLiu Bo err = -ENOENT; 22523561b9dbSLiu Bo 22533561b9dbSLiu Bo btrfs_release_path(path); 22545d4f98a2SYan Zheng break; 22555d4f98a2SYan Zheng } 22565d4f98a2SYan Zheng 22573fd0a558SYan, Zheng if (!upper->eb) { 22583fd0a558SYan, Zheng upper->eb = path->nodes[upper->level]; 22593fd0a558SYan, Zheng path->nodes[upper->level] = NULL; 22603fd0a558SYan, Zheng } else { 22613fd0a558SYan, Zheng BUG_ON(upper->eb != path->nodes[upper->level]); 22623fd0a558SYan, Zheng } 22633fd0a558SYan, Zheng 22643fd0a558SYan, Zheng upper->locked = 1; 22653fd0a558SYan, Zheng path->locks[upper->level] = 0; 22663fd0a558SYan, Zheng 22675d4f98a2SYan Zheng slot = path->slots[upper->level]; 2268b3b4aa74SDavid Sterba btrfs_release_path(path); 22695d4f98a2SYan Zheng } else { 2270e3b83361SQu Wenruo ret = btrfs_bin_search(upper->eb, key, &slot); 2271cbca7d59SFilipe Manana if (ret < 0) { 2272cbca7d59SFilipe Manana err = ret; 2273cbca7d59SFilipe Manana goto next; 2274cbca7d59SFilipe Manana } 22755d4f98a2SYan Zheng BUG_ON(ret); 22765d4f98a2SYan Zheng } 22775d4f98a2SYan Zheng 22785d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 22793fd0a558SYan, Zheng if (lowest) { 22804547f4d8SLiu Bo if (bytenr != node->bytenr) { 22814547f4d8SLiu Bo btrfs_err(root->fs_info, 22824547f4d8SLiu Bo "lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu", 22834547f4d8SLiu Bo bytenr, node->bytenr, slot, 22844547f4d8SLiu Bo upper->eb->start); 22854547f4d8SLiu Bo err = -EIO; 22864547f4d8SLiu Bo goto next; 22874547f4d8SLiu Bo } 22885d4f98a2SYan Zheng } else { 22893fd0a558SYan, Zheng if (node->eb->start == bytenr) 22903fd0a558SYan, Zheng goto next; 22915d4f98a2SYan Zheng } 22925d4f98a2SYan Zheng 2293da17066cSJeff Mahoney blocksize = root->fs_info->nodesize; 22945d4f98a2SYan Zheng generation = btrfs_node_ptr_generation(upper->eb, slot); 2295581c1760SQu Wenruo btrfs_node_key_to_cpu(upper->eb, &first_key, slot); 2296581c1760SQu Wenruo eb = read_tree_block(fs_info, bytenr, generation, 2297581c1760SQu Wenruo upper->level - 1, &first_key); 229864c043deSLiu Bo if (IS_ERR(eb)) { 229964c043deSLiu Bo err = PTR_ERR(eb); 230064c043deSLiu Bo goto next; 230164c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2302416bc658SJosef Bacik free_extent_buffer(eb); 230397d9a8a4STsutomu Itoh err = -EIO; 230497d9a8a4STsutomu Itoh goto next; 230597d9a8a4STsutomu Itoh } 23065d4f98a2SYan Zheng btrfs_tree_lock(eb); 23078bead258SDavid Sterba btrfs_set_lock_blocking_write(eb); 23085d4f98a2SYan Zheng 23095d4f98a2SYan Zheng if (!node->eb) { 23105d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, eb, upper->eb, 23115d4f98a2SYan Zheng slot, &eb); 23123fd0a558SYan, Zheng btrfs_tree_unlock(eb); 23133fd0a558SYan, Zheng free_extent_buffer(eb); 23145d4f98a2SYan Zheng if (ret < 0) { 23155d4f98a2SYan Zheng err = ret; 23163fd0a558SYan, Zheng goto next; 23175d4f98a2SYan Zheng } 23183fd0a558SYan, Zheng BUG_ON(node->eb != eb); 23195d4f98a2SYan Zheng } else { 23205d4f98a2SYan Zheng btrfs_set_node_blockptr(upper->eb, slot, 23215d4f98a2SYan Zheng node->eb->start); 23225d4f98a2SYan Zheng btrfs_set_node_ptr_generation(upper->eb, slot, 23235d4f98a2SYan Zheng trans->transid); 23245d4f98a2SYan Zheng btrfs_mark_buffer_dirty(upper->eb); 23255d4f98a2SYan Zheng 232682fa113fSQu Wenruo btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, 23275d4f98a2SYan Zheng node->eb->start, blocksize, 232882fa113fSQu Wenruo upper->eb->start); 232982fa113fSQu Wenruo ref.real_root = root->root_key.objectid; 233082fa113fSQu Wenruo btrfs_init_tree_ref(&ref, node->level, 233182fa113fSQu Wenruo btrfs_header_owner(upper->eb)); 233282fa113fSQu Wenruo ret = btrfs_inc_extent_ref(trans, &ref); 23335d4f98a2SYan Zheng BUG_ON(ret); 23345d4f98a2SYan Zheng 23355d4f98a2SYan Zheng ret = btrfs_drop_subtree(trans, root, eb, upper->eb); 23365d4f98a2SYan Zheng BUG_ON(ret); 23375d4f98a2SYan Zheng } 23383fd0a558SYan, Zheng next: 23393fd0a558SYan, Zheng if (!upper->pending) 2340b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(upper); 23413fd0a558SYan, Zheng else 2342b0fe7078SQu Wenruo btrfs_backref_unlock_node_buffer(upper); 23433fd0a558SYan, Zheng if (err) 23443fd0a558SYan, Zheng break; 23455d4f98a2SYan Zheng } 23463fd0a558SYan, Zheng 23473fd0a558SYan, Zheng if (!err && node->pending) { 2348b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 23493fd0a558SYan, Zheng list_move_tail(&node->list, &rc->backref_cache.changed); 23503fd0a558SYan, Zheng node->pending = 0; 23515d4f98a2SYan Zheng } 23523fd0a558SYan, Zheng 23535d4f98a2SYan Zheng path->lowest_level = 0; 23543fd0a558SYan, Zheng BUG_ON(err == -ENOSPC); 23555d4f98a2SYan Zheng return err; 23565d4f98a2SYan Zheng } 23575d4f98a2SYan Zheng 23585d4f98a2SYan Zheng static int link_to_upper(struct btrfs_trans_handle *trans, 23593fd0a558SYan, Zheng struct reloc_control *rc, 2360a26195a5SQu Wenruo struct btrfs_backref_node *node, 23615d4f98a2SYan Zheng struct btrfs_path *path) 23625d4f98a2SYan Zheng { 23635d4f98a2SYan Zheng struct btrfs_key key; 23645d4f98a2SYan Zheng 23655d4f98a2SYan Zheng btrfs_node_key_to_cpu(node->eb, &key, 0); 23663fd0a558SYan, Zheng return do_relocation(trans, rc, node, &key, path, 0); 23675d4f98a2SYan Zheng } 23685d4f98a2SYan Zheng 23695d4f98a2SYan Zheng static int finish_pending_nodes(struct btrfs_trans_handle *trans, 23703fd0a558SYan, Zheng struct reloc_control *rc, 23713fd0a558SYan, Zheng struct btrfs_path *path, int err) 23725d4f98a2SYan Zheng { 23733fd0a558SYan, Zheng LIST_HEAD(list); 2374a26195a5SQu Wenruo struct btrfs_backref_cache *cache = &rc->backref_cache; 2375a26195a5SQu Wenruo struct btrfs_backref_node *node; 23765d4f98a2SYan Zheng int level; 23775d4f98a2SYan Zheng int ret; 23785d4f98a2SYan Zheng 23795d4f98a2SYan Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 23805d4f98a2SYan Zheng while (!list_empty(&cache->pending[level])) { 23815d4f98a2SYan Zheng node = list_entry(cache->pending[level].next, 2382a26195a5SQu Wenruo struct btrfs_backref_node, list); 23833fd0a558SYan, Zheng list_move_tail(&node->list, &list); 23843fd0a558SYan, Zheng BUG_ON(!node->pending); 23855d4f98a2SYan Zheng 23863fd0a558SYan, Zheng if (!err) { 23873fd0a558SYan, Zheng ret = link_to_upper(trans, rc, node, path); 23885d4f98a2SYan Zheng if (ret < 0) 23895d4f98a2SYan Zheng err = ret; 23905d4f98a2SYan Zheng } 23915d4f98a2SYan Zheng } 23923fd0a558SYan, Zheng list_splice_init(&list, &cache->pending[level]); 23933fd0a558SYan, Zheng } 23945d4f98a2SYan Zheng return err; 23955d4f98a2SYan Zheng } 23965d4f98a2SYan Zheng 23975d4f98a2SYan Zheng /* 23985d4f98a2SYan Zheng * mark a block and all blocks directly/indirectly reference the block 23995d4f98a2SYan Zheng * as processed. 24005d4f98a2SYan Zheng */ 24015d4f98a2SYan Zheng static void update_processed_blocks(struct reloc_control *rc, 2402a26195a5SQu Wenruo struct btrfs_backref_node *node) 24035d4f98a2SYan Zheng { 2404a26195a5SQu Wenruo struct btrfs_backref_node *next = node; 2405a26195a5SQu Wenruo struct btrfs_backref_edge *edge; 2406a26195a5SQu Wenruo struct btrfs_backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 24075d4f98a2SYan Zheng int index = 0; 24085d4f98a2SYan Zheng 24095d4f98a2SYan Zheng while (next) { 24105d4f98a2SYan Zheng cond_resched(); 24115d4f98a2SYan Zheng while (1) { 24125d4f98a2SYan Zheng if (next->processed) 24135d4f98a2SYan Zheng break; 24145d4f98a2SYan Zheng 24159569cc20SQu Wenruo mark_block_processed(rc, next); 24165d4f98a2SYan Zheng 24175d4f98a2SYan Zheng if (list_empty(&next->upper)) 24185d4f98a2SYan Zheng break; 24195d4f98a2SYan Zheng 24205d4f98a2SYan Zheng edge = list_entry(next->upper.next, 2421a26195a5SQu Wenruo struct btrfs_backref_edge, list[LOWER]); 24225d4f98a2SYan Zheng edges[index++] = edge; 24235d4f98a2SYan Zheng next = edge->node[UPPER]; 24245d4f98a2SYan Zheng } 24255d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 24265d4f98a2SYan Zheng } 24275d4f98a2SYan Zheng } 24285d4f98a2SYan Zheng 24297476dfdaSDavid Sterba static int tree_block_processed(u64 bytenr, struct reloc_control *rc) 24305d4f98a2SYan Zheng { 2431da17066cSJeff Mahoney u32 blocksize = rc->extent_root->fs_info->nodesize; 24327476dfdaSDavid Sterba 24335d4f98a2SYan Zheng if (test_range_bit(&rc->processed_blocks, bytenr, 24349655d298SChris Mason bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) 24355d4f98a2SYan Zheng return 1; 24365d4f98a2SYan Zheng return 0; 24375d4f98a2SYan Zheng } 24385d4f98a2SYan Zheng 24392ff7e61eSJeff Mahoney static int get_tree_block_key(struct btrfs_fs_info *fs_info, 24405d4f98a2SYan Zheng struct tree_block *block) 24415d4f98a2SYan Zheng { 24425d4f98a2SYan Zheng struct extent_buffer *eb; 24435d4f98a2SYan Zheng 2444581c1760SQu Wenruo eb = read_tree_block(fs_info, block->bytenr, block->key.offset, 2445581c1760SQu Wenruo block->level, NULL); 244664c043deSLiu Bo if (IS_ERR(eb)) { 244764c043deSLiu Bo return PTR_ERR(eb); 244864c043deSLiu Bo } else if (!extent_buffer_uptodate(eb)) { 2449416bc658SJosef Bacik free_extent_buffer(eb); 2450416bc658SJosef Bacik return -EIO; 2451416bc658SJosef Bacik } 24525d4f98a2SYan Zheng if (block->level == 0) 24535d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &block->key, 0); 24545d4f98a2SYan Zheng else 24555d4f98a2SYan Zheng btrfs_node_key_to_cpu(eb, &block->key, 0); 24565d4f98a2SYan Zheng free_extent_buffer(eb); 24575d4f98a2SYan Zheng block->key_ready = 1; 24585d4f98a2SYan Zheng return 0; 24595d4f98a2SYan Zheng } 24605d4f98a2SYan Zheng 24615d4f98a2SYan Zheng /* 24625d4f98a2SYan Zheng * helper function to relocate a tree block 24635d4f98a2SYan Zheng */ 24645d4f98a2SYan Zheng static int relocate_tree_block(struct btrfs_trans_handle *trans, 24655d4f98a2SYan Zheng struct reloc_control *rc, 2466a26195a5SQu Wenruo struct btrfs_backref_node *node, 24675d4f98a2SYan Zheng struct btrfs_key *key, 24685d4f98a2SYan Zheng struct btrfs_path *path) 24695d4f98a2SYan Zheng { 24705d4f98a2SYan Zheng struct btrfs_root *root; 24713fd0a558SYan, Zheng int ret = 0; 24725d4f98a2SYan Zheng 24733fd0a558SYan, Zheng if (!node) 24745d4f98a2SYan Zheng return 0; 24753fd0a558SYan, Zheng 24765f6b2e5cSJosef Bacik /* 24775f6b2e5cSJosef Bacik * If we fail here we want to drop our backref_node because we are going 24785f6b2e5cSJosef Bacik * to start over and regenerate the tree for it. 24795f6b2e5cSJosef Bacik */ 24805f6b2e5cSJosef Bacik ret = reserve_metadata_space(trans, rc, node); 24815f6b2e5cSJosef Bacik if (ret) 24825f6b2e5cSJosef Bacik goto out; 24835f6b2e5cSJosef Bacik 24843fd0a558SYan, Zheng BUG_ON(node->processed); 2485147d256eSZhaolei root = select_one_root(node); 24863fd0a558SYan, Zheng if (root == ERR_PTR(-ENOENT)) { 24873fd0a558SYan, Zheng update_processed_blocks(rc, node); 24883fd0a558SYan, Zheng goto out; 24895d4f98a2SYan Zheng } 24905d4f98a2SYan Zheng 24913fd0a558SYan, Zheng if (root) { 249292a7cc42SQu Wenruo if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) { 24933fd0a558SYan, Zheng BUG_ON(node->new_bytenr); 24943fd0a558SYan, Zheng BUG_ON(!list_empty(&node->list)); 24953fd0a558SYan, Zheng btrfs_record_root_in_trans(trans, root); 24963fd0a558SYan, Zheng root = root->reloc_root; 24973fd0a558SYan, Zheng node->new_bytenr = root->node->start; 249800246528SJosef Bacik btrfs_put_root(node->root); 249900246528SJosef Bacik node->root = btrfs_grab_root(root); 25000b530bc5SJosef Bacik ASSERT(node->root); 25013fd0a558SYan, Zheng list_add_tail(&node->list, &rc->backref_cache.changed); 25023fd0a558SYan, Zheng } else { 25035d4f98a2SYan Zheng path->lowest_level = node->level; 25045d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 2505b3b4aa74SDavid Sterba btrfs_release_path(path); 25063fd0a558SYan, Zheng if (ret > 0) 25075d4f98a2SYan Zheng ret = 0; 25083fd0a558SYan, Zheng } 25093fd0a558SYan, Zheng if (!ret) 25103fd0a558SYan, Zheng update_processed_blocks(rc, node); 25113fd0a558SYan, Zheng } else { 25123fd0a558SYan, Zheng ret = do_relocation(trans, rc, node, key, path, 1); 25133fd0a558SYan, Zheng } 25145d4f98a2SYan Zheng out: 25150647bf56SWang Shilong if (ret || node->level == 0 || node->cowonly) 2516023acb07SQu Wenruo btrfs_backref_cleanup_node(&rc->backref_cache, node); 25175d4f98a2SYan Zheng return ret; 25185d4f98a2SYan Zheng } 25195d4f98a2SYan Zheng 25205d4f98a2SYan Zheng /* 25215d4f98a2SYan Zheng * relocate a list of blocks 25225d4f98a2SYan Zheng */ 25235d4f98a2SYan Zheng static noinline_for_stack 25245d4f98a2SYan Zheng int relocate_tree_blocks(struct btrfs_trans_handle *trans, 25255d4f98a2SYan Zheng struct reloc_control *rc, struct rb_root *blocks) 25265d4f98a2SYan Zheng { 25272ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 2528a26195a5SQu Wenruo struct btrfs_backref_node *node; 25295d4f98a2SYan Zheng struct btrfs_path *path; 25305d4f98a2SYan Zheng struct tree_block *block; 253198ff7b94SQu Wenruo struct tree_block *next; 25325d4f98a2SYan Zheng int ret; 25335d4f98a2SYan Zheng int err = 0; 25345d4f98a2SYan Zheng 25355d4f98a2SYan Zheng path = btrfs_alloc_path(); 2536e1a12670SLiu Bo if (!path) { 2537e1a12670SLiu Bo err = -ENOMEM; 253834c2b290SDavid Sterba goto out_free_blocks; 2539e1a12670SLiu Bo } 25405d4f98a2SYan Zheng 254198ff7b94SQu Wenruo /* Kick in readahead for tree blocks with missing keys */ 254298ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 25435d4f98a2SYan Zheng if (!block->key_ready) 25442ff7e61eSJeff Mahoney readahead_tree_block(fs_info, block->bytenr); 25455d4f98a2SYan Zheng } 25465d4f98a2SYan Zheng 254798ff7b94SQu Wenruo /* Get first keys */ 254898ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 254934c2b290SDavid Sterba if (!block->key_ready) { 25502ff7e61eSJeff Mahoney err = get_tree_block_key(fs_info, block); 255134c2b290SDavid Sterba if (err) 255234c2b290SDavid Sterba goto out_free_path; 255334c2b290SDavid Sterba } 25545d4f98a2SYan Zheng } 25555d4f98a2SYan Zheng 255698ff7b94SQu Wenruo /* Do tree relocation */ 255798ff7b94SQu Wenruo rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) { 25583fd0a558SYan, Zheng node = build_backref_tree(rc, &block->key, 25595d4f98a2SYan Zheng block->level, block->bytenr); 25605d4f98a2SYan Zheng if (IS_ERR(node)) { 25615d4f98a2SYan Zheng err = PTR_ERR(node); 25625d4f98a2SYan Zheng goto out; 25635d4f98a2SYan Zheng } 25645d4f98a2SYan Zheng 25655d4f98a2SYan Zheng ret = relocate_tree_block(trans, rc, node, &block->key, 25665d4f98a2SYan Zheng path); 25675d4f98a2SYan Zheng if (ret < 0) { 25685d4f98a2SYan Zheng err = ret; 256950dbbb71SJosef Bacik break; 25705d4f98a2SYan Zheng } 25715d4f98a2SYan Zheng } 25725d4f98a2SYan Zheng out: 25733fd0a558SYan, Zheng err = finish_pending_nodes(trans, rc, path, err); 25745d4f98a2SYan Zheng 257534c2b290SDavid Sterba out_free_path: 25765d4f98a2SYan Zheng btrfs_free_path(path); 257734c2b290SDavid Sterba out_free_blocks: 2578e1a12670SLiu Bo free_block_list(blocks); 25795d4f98a2SYan Zheng return err; 25805d4f98a2SYan Zheng } 25815d4f98a2SYan Zheng 25825d4f98a2SYan Zheng static noinline_for_stack 2583efa56464SYan, Zheng int prealloc_file_extent_cluster(struct inode *inode, 2584efa56464SYan, Zheng struct file_extent_cluster *cluster) 2585efa56464SYan, Zheng { 2586efa56464SYan, Zheng u64 alloc_hint = 0; 2587efa56464SYan, Zheng u64 start; 2588efa56464SYan, Zheng u64 end; 2589efa56464SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 2590efa56464SYan, Zheng u64 num_bytes; 2591efa56464SYan, Zheng int nr = 0; 2592efa56464SYan, Zheng int ret = 0; 2593dcb40c19SWang Xiaoguang u64 prealloc_start = cluster->start - offset; 2594dcb40c19SWang Xiaoguang u64 prealloc_end = cluster->end - offset; 259518513091SWang Xiaoguang u64 cur_offset; 2596364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 2597efa56464SYan, Zheng 2598efa56464SYan, Zheng BUG_ON(cluster->start != cluster->boundary[0]); 25995955102cSAl Viro inode_lock(inode); 2600efa56464SYan, Zheng 2601364ecf36SQu Wenruo ret = btrfs_check_data_free_space(inode, &data_reserved, prealloc_start, 2602dcb40c19SWang Xiaoguang prealloc_end + 1 - prealloc_start); 2603efa56464SYan, Zheng if (ret) 2604efa56464SYan, Zheng goto out; 2605efa56464SYan, Zheng 260618513091SWang Xiaoguang cur_offset = prealloc_start; 2607efa56464SYan, Zheng while (nr < cluster->nr) { 2608efa56464SYan, Zheng start = cluster->boundary[nr] - offset; 2609efa56464SYan, Zheng if (nr + 1 < cluster->nr) 2610efa56464SYan, Zheng end = cluster->boundary[nr + 1] - 1 - offset; 2611efa56464SYan, Zheng else 2612efa56464SYan, Zheng end = cluster->end - offset; 2613efa56464SYan, Zheng 2614d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 2615efa56464SYan, Zheng num_bytes = end + 1 - start; 261618513091SWang Xiaoguang if (cur_offset < start) 2617bc42bda2SQu Wenruo btrfs_free_reserved_data_space(inode, data_reserved, 2618bc42bda2SQu Wenruo cur_offset, start - cur_offset); 2619efa56464SYan, Zheng ret = btrfs_prealloc_file_range(inode, 0, start, 2620efa56464SYan, Zheng num_bytes, num_bytes, 2621efa56464SYan, Zheng end + 1, &alloc_hint); 262218513091SWang Xiaoguang cur_offset = end + 1; 2623d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 2624efa56464SYan, Zheng if (ret) 2625efa56464SYan, Zheng break; 2626efa56464SYan, Zheng nr++; 2627efa56464SYan, Zheng } 262818513091SWang Xiaoguang if (cur_offset < prealloc_end) 2629bc42bda2SQu Wenruo btrfs_free_reserved_data_space(inode, data_reserved, 2630bc42bda2SQu Wenruo cur_offset, prealloc_end + 1 - cur_offset); 2631efa56464SYan, Zheng out: 26325955102cSAl Viro inode_unlock(inode); 2633364ecf36SQu Wenruo extent_changeset_free(data_reserved); 2634efa56464SYan, Zheng return ret; 2635efa56464SYan, Zheng } 2636efa56464SYan, Zheng 2637efa56464SYan, Zheng static noinline_for_stack 26380257bb82SYan, Zheng int setup_extent_mapping(struct inode *inode, u64 start, u64 end, 26390257bb82SYan, Zheng u64 block_start) 26405d4f98a2SYan Zheng { 26415d4f98a2SYan Zheng struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 26425d4f98a2SYan Zheng struct extent_map *em; 26430257bb82SYan, Zheng int ret = 0; 26445d4f98a2SYan Zheng 2645172ddd60SDavid Sterba em = alloc_extent_map(); 26460257bb82SYan, Zheng if (!em) 26470257bb82SYan, Zheng return -ENOMEM; 26480257bb82SYan, Zheng 26495d4f98a2SYan Zheng em->start = start; 26500257bb82SYan, Zheng em->len = end + 1 - start; 26510257bb82SYan, Zheng em->block_len = em->len; 26520257bb82SYan, Zheng em->block_start = block_start; 26535d4f98a2SYan Zheng set_bit(EXTENT_FLAG_PINNED, &em->flags); 26545d4f98a2SYan Zheng 2655d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 26565d4f98a2SYan Zheng while (1) { 2657890871beSChris Mason write_lock(&em_tree->lock); 265809a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 2659890871beSChris Mason write_unlock(&em_tree->lock); 26605d4f98a2SYan Zheng if (ret != -EEXIST) { 26615d4f98a2SYan Zheng free_extent_map(em); 26625d4f98a2SYan Zheng break; 26635d4f98a2SYan Zheng } 2664dcdbc059SNikolay Borisov btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0); 26655d4f98a2SYan Zheng } 2666d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 26670257bb82SYan, Zheng return ret; 26680257bb82SYan, Zheng } 26695d4f98a2SYan Zheng 2670726a3421SQu Wenruo /* 2671726a3421SQu Wenruo * Allow error injection to test balance cancellation 2672726a3421SQu Wenruo */ 2673726a3421SQu Wenruo int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info) 2674726a3421SQu Wenruo { 2675726a3421SQu Wenruo return atomic_read(&fs_info->balance_cancel_req); 2676726a3421SQu Wenruo } 2677726a3421SQu Wenruo ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE); 2678726a3421SQu Wenruo 26790257bb82SYan, Zheng static int relocate_file_extent_cluster(struct inode *inode, 26800257bb82SYan, Zheng struct file_extent_cluster *cluster) 26810257bb82SYan, Zheng { 26822ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26830257bb82SYan, Zheng u64 page_start; 26840257bb82SYan, Zheng u64 page_end; 26850257bb82SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 26860257bb82SYan, Zheng unsigned long index; 26870257bb82SYan, Zheng unsigned long last_index; 26880257bb82SYan, Zheng struct page *page; 26890257bb82SYan, Zheng struct file_ra_state *ra; 26903b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 26910257bb82SYan, Zheng int nr = 0; 26920257bb82SYan, Zheng int ret = 0; 26930257bb82SYan, Zheng 26940257bb82SYan, Zheng if (!cluster->nr) 26950257bb82SYan, Zheng return 0; 26960257bb82SYan, Zheng 26970257bb82SYan, Zheng ra = kzalloc(sizeof(*ra), GFP_NOFS); 26980257bb82SYan, Zheng if (!ra) 26990257bb82SYan, Zheng return -ENOMEM; 27000257bb82SYan, Zheng 2701efa56464SYan, Zheng ret = prealloc_file_extent_cluster(inode, cluster); 27020257bb82SYan, Zheng if (ret) 2703efa56464SYan, Zheng goto out; 27040257bb82SYan, Zheng 27050257bb82SYan, Zheng file_ra_state_init(ra, inode->i_mapping); 27060257bb82SYan, Zheng 2707efa56464SYan, Zheng ret = setup_extent_mapping(inode, cluster->start - offset, 2708efa56464SYan, Zheng cluster->end - offset, cluster->start); 2709efa56464SYan, Zheng if (ret) 2710efa56464SYan, Zheng goto out; 2711efa56464SYan, Zheng 271209cbfeafSKirill A. Shutemov index = (cluster->start - offset) >> PAGE_SHIFT; 271309cbfeafSKirill A. Shutemov last_index = (cluster->end - offset) >> PAGE_SHIFT; 27140257bb82SYan, Zheng while (index <= last_index) { 27159f3db423SNikolay Borisov ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), 27169f3db423SNikolay Borisov PAGE_SIZE); 2717efa56464SYan, Zheng if (ret) 2718efa56464SYan, Zheng goto out; 2719efa56464SYan, Zheng 27200257bb82SYan, Zheng page = find_lock_page(inode->i_mapping, index); 27210257bb82SYan, Zheng if (!page) { 27220257bb82SYan, Zheng page_cache_sync_readahead(inode->i_mapping, 27230257bb82SYan, Zheng ra, NULL, index, 27240257bb82SYan, Zheng last_index + 1 - index); 2725a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, index, 27263b16a4e3SJosef Bacik mask); 27270257bb82SYan, Zheng if (!page) { 2728691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 272943b18595SQu Wenruo PAGE_SIZE, true); 273044db1216SFilipe Manana btrfs_delalloc_release_extents(BTRFS_I(inode), 27318702ba93SQu Wenruo PAGE_SIZE); 27320257bb82SYan, Zheng ret = -ENOMEM; 2733efa56464SYan, Zheng goto out; 27340257bb82SYan, Zheng } 27350257bb82SYan, Zheng } 27360257bb82SYan, Zheng 27370257bb82SYan, Zheng if (PageReadahead(page)) { 27380257bb82SYan, Zheng page_cache_async_readahead(inode->i_mapping, 27390257bb82SYan, Zheng ra, NULL, page, index, 27400257bb82SYan, Zheng last_index + 1 - index); 27410257bb82SYan, Zheng } 27420257bb82SYan, Zheng 27430257bb82SYan, Zheng if (!PageUptodate(page)) { 27440257bb82SYan, Zheng btrfs_readpage(NULL, page); 27450257bb82SYan, Zheng lock_page(page); 27460257bb82SYan, Zheng if (!PageUptodate(page)) { 27470257bb82SYan, Zheng unlock_page(page); 274809cbfeafSKirill A. Shutemov put_page(page); 2749691fa059SNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 275043b18595SQu Wenruo PAGE_SIZE, true); 27518b62f87bSJosef Bacik btrfs_delalloc_release_extents(BTRFS_I(inode), 27528702ba93SQu Wenruo PAGE_SIZE); 27530257bb82SYan, Zheng ret = -EIO; 2754efa56464SYan, Zheng goto out; 27550257bb82SYan, Zheng } 27560257bb82SYan, Zheng } 27570257bb82SYan, Zheng 27584eee4fa4SMiao Xie page_start = page_offset(page); 275909cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 27600257bb82SYan, Zheng 2761d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); 27620257bb82SYan, Zheng 27630257bb82SYan, Zheng set_page_extent_mapped(page); 27640257bb82SYan, Zheng 27650257bb82SYan, Zheng if (nr < cluster->nr && 27660257bb82SYan, Zheng page_start + offset == cluster->boundary[nr]) { 27670257bb82SYan, Zheng set_extent_bits(&BTRFS_I(inode)->io_tree, 27680257bb82SYan, Zheng page_start, page_end, 2769ceeb0ae7SDavid Sterba EXTENT_BOUNDARY); 27700257bb82SYan, Zheng nr++; 27710257bb82SYan, Zheng } 27720257bb82SYan, Zheng 2773765f3cebSNikolay Borisov ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0, 2774330a5827SNikolay Borisov NULL); 2775765f3cebSNikolay Borisov if (ret) { 2776765f3cebSNikolay Borisov unlock_page(page); 2777765f3cebSNikolay Borisov put_page(page); 2778765f3cebSNikolay Borisov btrfs_delalloc_release_metadata(BTRFS_I(inode), 277943b18595SQu Wenruo PAGE_SIZE, true); 2780765f3cebSNikolay Borisov btrfs_delalloc_release_extents(BTRFS_I(inode), 27818702ba93SQu Wenruo PAGE_SIZE); 2782765f3cebSNikolay Borisov 2783765f3cebSNikolay Borisov clear_extent_bits(&BTRFS_I(inode)->io_tree, 2784765f3cebSNikolay Borisov page_start, page_end, 2785765f3cebSNikolay Borisov EXTENT_LOCKED | EXTENT_BOUNDARY); 2786765f3cebSNikolay Borisov goto out; 2787765f3cebSNikolay Borisov 2788765f3cebSNikolay Borisov } 27890257bb82SYan, Zheng set_page_dirty(page); 27900257bb82SYan, Zheng 27910257bb82SYan, Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 2792d0082371SJeff Mahoney page_start, page_end); 27930257bb82SYan, Zheng unlock_page(page); 279409cbfeafSKirill A. Shutemov put_page(page); 27950257bb82SYan, Zheng 27960257bb82SYan, Zheng index++; 27978702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE); 2798efa56464SYan, Zheng balance_dirty_pages_ratelimited(inode->i_mapping); 27992ff7e61eSJeff Mahoney btrfs_throttle(fs_info); 28007f913c7cSQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 28017f913c7cSQu Wenruo ret = -ECANCELED; 28027f913c7cSQu Wenruo goto out; 28037f913c7cSQu Wenruo } 28040257bb82SYan, Zheng } 28050257bb82SYan, Zheng WARN_ON(nr != cluster->nr); 2806efa56464SYan, Zheng out: 28070257bb82SYan, Zheng kfree(ra); 28080257bb82SYan, Zheng return ret; 28090257bb82SYan, Zheng } 28100257bb82SYan, Zheng 28110257bb82SYan, Zheng static noinline_for_stack 28120257bb82SYan, Zheng int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, 28130257bb82SYan, Zheng struct file_extent_cluster *cluster) 28140257bb82SYan, Zheng { 28150257bb82SYan, Zheng int ret; 28160257bb82SYan, Zheng 28170257bb82SYan, Zheng if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { 28180257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28190257bb82SYan, Zheng if (ret) 28200257bb82SYan, Zheng return ret; 28210257bb82SYan, Zheng cluster->nr = 0; 28220257bb82SYan, Zheng } 28230257bb82SYan, Zheng 28240257bb82SYan, Zheng if (!cluster->nr) 28250257bb82SYan, Zheng cluster->start = extent_key->objectid; 28260257bb82SYan, Zheng else 28270257bb82SYan, Zheng BUG_ON(cluster->nr >= MAX_EXTENTS); 28280257bb82SYan, Zheng cluster->end = extent_key->objectid + extent_key->offset - 1; 28290257bb82SYan, Zheng cluster->boundary[cluster->nr] = extent_key->objectid; 28300257bb82SYan, Zheng cluster->nr++; 28310257bb82SYan, Zheng 28320257bb82SYan, Zheng if (cluster->nr >= MAX_EXTENTS) { 28330257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 28340257bb82SYan, Zheng if (ret) 28350257bb82SYan, Zheng return ret; 28360257bb82SYan, Zheng cluster->nr = 0; 28370257bb82SYan, Zheng } 28380257bb82SYan, Zheng return 0; 28395d4f98a2SYan Zheng } 28405d4f98a2SYan Zheng 28415d4f98a2SYan Zheng /* 28425d4f98a2SYan Zheng * helper to add a tree block to the list. 28435d4f98a2SYan Zheng * the major work is getting the generation and level of the block 28445d4f98a2SYan Zheng */ 28455d4f98a2SYan Zheng static int add_tree_block(struct reloc_control *rc, 28465d4f98a2SYan Zheng struct btrfs_key *extent_key, 28475d4f98a2SYan Zheng struct btrfs_path *path, 28485d4f98a2SYan Zheng struct rb_root *blocks) 28495d4f98a2SYan Zheng { 28505d4f98a2SYan Zheng struct extent_buffer *eb; 28515d4f98a2SYan Zheng struct btrfs_extent_item *ei; 28525d4f98a2SYan Zheng struct btrfs_tree_block_info *bi; 28535d4f98a2SYan Zheng struct tree_block *block; 28545d4f98a2SYan Zheng struct rb_node *rb_node; 28555d4f98a2SYan Zheng u32 item_size; 28565d4f98a2SYan Zheng int level = -1; 28577fdf4b60SWang Shilong u64 generation; 28585d4f98a2SYan Zheng 28595d4f98a2SYan Zheng eb = path->nodes[0]; 28605d4f98a2SYan Zheng item_size = btrfs_item_size_nr(eb, path->slots[0]); 28615d4f98a2SYan Zheng 28623173a18fSJosef Bacik if (extent_key->type == BTRFS_METADATA_ITEM_KEY || 28633173a18fSJosef Bacik item_size >= sizeof(*ei) + sizeof(*bi)) { 28645d4f98a2SYan Zheng ei = btrfs_item_ptr(eb, path->slots[0], 28655d4f98a2SYan Zheng struct btrfs_extent_item); 28663173a18fSJosef Bacik if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { 28675d4f98a2SYan Zheng bi = (struct btrfs_tree_block_info *)(ei + 1); 28685d4f98a2SYan Zheng level = btrfs_tree_block_level(eb, bi); 28695d4f98a2SYan Zheng } else { 28703173a18fSJosef Bacik level = (int)extent_key->offset; 28713173a18fSJosef Bacik } 28723173a18fSJosef Bacik generation = btrfs_extent_generation(eb, ei); 28736d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 2874ba3c2b19SNikolay Borisov btrfs_print_v0_err(eb->fs_info); 2875ba3c2b19SNikolay Borisov btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL); 2876ba3c2b19SNikolay Borisov return -EINVAL; 28773173a18fSJosef Bacik } else { 28785d4f98a2SYan Zheng BUG(); 28795d4f98a2SYan Zheng } 28805d4f98a2SYan Zheng 2881b3b4aa74SDavid Sterba btrfs_release_path(path); 28825d4f98a2SYan Zheng 28835d4f98a2SYan Zheng BUG_ON(level == -1); 28845d4f98a2SYan Zheng 28855d4f98a2SYan Zheng block = kmalloc(sizeof(*block), GFP_NOFS); 28865d4f98a2SYan Zheng if (!block) 28875d4f98a2SYan Zheng return -ENOMEM; 28885d4f98a2SYan Zheng 28895d4f98a2SYan Zheng block->bytenr = extent_key->objectid; 2890da17066cSJeff Mahoney block->key.objectid = rc->extent_root->fs_info->nodesize; 28915d4f98a2SYan Zheng block->key.offset = generation; 28925d4f98a2SYan Zheng block->level = level; 28935d4f98a2SYan Zheng block->key_ready = 0; 28945d4f98a2SYan Zheng 2895e9a28dc5SQu Wenruo rb_node = rb_simple_insert(blocks, block->bytenr, &block->rb_node); 289643c04fb1SJeff Mahoney if (rb_node) 2897982c92cbSQu Wenruo btrfs_backref_panic(rc->extent_root->fs_info, block->bytenr, 2898982c92cbSQu Wenruo -EEXIST); 28995d4f98a2SYan Zheng 29005d4f98a2SYan Zheng return 0; 29015d4f98a2SYan Zheng } 29025d4f98a2SYan Zheng 29035d4f98a2SYan Zheng /* 29045d4f98a2SYan Zheng * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY 29055d4f98a2SYan Zheng */ 29065d4f98a2SYan Zheng static int __add_tree_block(struct reloc_control *rc, 29075d4f98a2SYan Zheng u64 bytenr, u32 blocksize, 29085d4f98a2SYan Zheng struct rb_root *blocks) 29095d4f98a2SYan Zheng { 29100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 29115d4f98a2SYan Zheng struct btrfs_path *path; 29125d4f98a2SYan Zheng struct btrfs_key key; 29135d4f98a2SYan Zheng int ret; 29140b246afaSJeff Mahoney bool skinny = btrfs_fs_incompat(fs_info, SKINNY_METADATA); 29155d4f98a2SYan Zheng 29167476dfdaSDavid Sterba if (tree_block_processed(bytenr, rc)) 29175d4f98a2SYan Zheng return 0; 29185d4f98a2SYan Zheng 2919e9a28dc5SQu Wenruo if (rb_simple_search(blocks, bytenr)) 29205d4f98a2SYan Zheng return 0; 29215d4f98a2SYan Zheng 29225d4f98a2SYan Zheng path = btrfs_alloc_path(); 29235d4f98a2SYan Zheng if (!path) 29245d4f98a2SYan Zheng return -ENOMEM; 2925aee68ee5SJosef Bacik again: 29265d4f98a2SYan Zheng key.objectid = bytenr; 2927aee68ee5SJosef Bacik if (skinny) { 2928aee68ee5SJosef Bacik key.type = BTRFS_METADATA_ITEM_KEY; 2929aee68ee5SJosef Bacik key.offset = (u64)-1; 2930aee68ee5SJosef Bacik } else { 29315d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 29325d4f98a2SYan Zheng key.offset = blocksize; 2933aee68ee5SJosef Bacik } 29345d4f98a2SYan Zheng 29355d4f98a2SYan Zheng path->search_commit_root = 1; 29365d4f98a2SYan Zheng path->skip_locking = 1; 29375d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); 29385d4f98a2SYan Zheng if (ret < 0) 29395d4f98a2SYan Zheng goto out; 29405d4f98a2SYan Zheng 2941aee68ee5SJosef Bacik if (ret > 0 && skinny) { 2942aee68ee5SJosef Bacik if (path->slots[0]) { 2943aee68ee5SJosef Bacik path->slots[0]--; 2944aee68ee5SJosef Bacik btrfs_item_key_to_cpu(path->nodes[0], &key, 2945aee68ee5SJosef Bacik path->slots[0]); 29463173a18fSJosef Bacik if (key.objectid == bytenr && 2947aee68ee5SJosef Bacik (key.type == BTRFS_METADATA_ITEM_KEY || 2948aee68ee5SJosef Bacik (key.type == BTRFS_EXTENT_ITEM_KEY && 2949aee68ee5SJosef Bacik key.offset == blocksize))) 29503173a18fSJosef Bacik ret = 0; 29513173a18fSJosef Bacik } 2952aee68ee5SJosef Bacik 2953aee68ee5SJosef Bacik if (ret) { 2954aee68ee5SJosef Bacik skinny = false; 2955aee68ee5SJosef Bacik btrfs_release_path(path); 2956aee68ee5SJosef Bacik goto again; 2957aee68ee5SJosef Bacik } 2958aee68ee5SJosef Bacik } 2959cdccee99SLiu Bo if (ret) { 2960cdccee99SLiu Bo ASSERT(ret == 1); 2961cdccee99SLiu Bo btrfs_print_leaf(path->nodes[0]); 2962cdccee99SLiu Bo btrfs_err(fs_info, 2963cdccee99SLiu Bo "tree block extent item (%llu) is not found in extent tree", 2964cdccee99SLiu Bo bytenr); 2965cdccee99SLiu Bo WARN_ON(1); 2966cdccee99SLiu Bo ret = -EINVAL; 2967cdccee99SLiu Bo goto out; 2968cdccee99SLiu Bo } 29693173a18fSJosef Bacik 29705d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, blocks); 29715d4f98a2SYan Zheng out: 29725d4f98a2SYan Zheng btrfs_free_path(path); 29735d4f98a2SYan Zheng return ret; 29745d4f98a2SYan Zheng } 29755d4f98a2SYan Zheng 29760af3d00bSJosef Bacik static int delete_block_group_cache(struct btrfs_fs_info *fs_info, 297732da5386SDavid Sterba struct btrfs_block_group *block_group, 29781bbc621eSChris Mason struct inode *inode, 29791bbc621eSChris Mason u64 ino) 29800af3d00bSJosef Bacik { 29810af3d00bSJosef Bacik struct btrfs_key key; 29820af3d00bSJosef Bacik struct btrfs_root *root = fs_info->tree_root; 29830af3d00bSJosef Bacik struct btrfs_trans_handle *trans; 29840af3d00bSJosef Bacik int ret = 0; 29850af3d00bSJosef Bacik 29860af3d00bSJosef Bacik if (inode) 29870af3d00bSJosef Bacik goto truncate; 29880af3d00bSJosef Bacik 29890af3d00bSJosef Bacik key.objectid = ino; 29900af3d00bSJosef Bacik key.type = BTRFS_INODE_ITEM_KEY; 29910af3d00bSJosef Bacik key.offset = 0; 29920af3d00bSJosef Bacik 29934c66e0d4SDavid Sterba inode = btrfs_iget(fs_info->sb, &key, root); 29942e19f1f9SAl Viro if (IS_ERR(inode)) 29950af3d00bSJosef Bacik return -ENOENT; 29960af3d00bSJosef Bacik 29970af3d00bSJosef Bacik truncate: 29982ff7e61eSJeff Mahoney ret = btrfs_check_trunc_cache_free_space(fs_info, 29997b61cd92SMiao Xie &fs_info->global_block_rsv); 30007b61cd92SMiao Xie if (ret) 30017b61cd92SMiao Xie goto out; 30027b61cd92SMiao Xie 30037a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 30040af3d00bSJosef Bacik if (IS_ERR(trans)) { 30053612b495STsutomu Itoh ret = PTR_ERR(trans); 30060af3d00bSJosef Bacik goto out; 30070af3d00bSJosef Bacik } 30080af3d00bSJosef Bacik 300977ab86bfSJeff Mahoney ret = btrfs_truncate_free_space_cache(trans, block_group, inode); 30100af3d00bSJosef Bacik 30113a45bb20SJeff Mahoney btrfs_end_transaction(trans); 30122ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 30130af3d00bSJosef Bacik out: 30140af3d00bSJosef Bacik iput(inode); 30150af3d00bSJosef Bacik return ret; 30160af3d00bSJosef Bacik } 30170af3d00bSJosef Bacik 30185d4f98a2SYan Zheng /* 301919b546d7SQu Wenruo * Locate the free space cache EXTENT_DATA in root tree leaf and delete the 302019b546d7SQu Wenruo * cache inode, to avoid free space cache data extent blocking data relocation. 30215d4f98a2SYan Zheng */ 302219b546d7SQu Wenruo static int delete_v1_space_cache(struct extent_buffer *leaf, 302319b546d7SQu Wenruo struct btrfs_block_group *block_group, 302419b546d7SQu Wenruo u64 data_bytenr) 30255d4f98a2SYan Zheng { 302619b546d7SQu Wenruo u64 space_cache_ino; 302719b546d7SQu Wenruo struct btrfs_file_extent_item *ei; 30285d4f98a2SYan Zheng struct btrfs_key key; 302919b546d7SQu Wenruo bool found = false; 303019b546d7SQu Wenruo int i; 30315d4f98a2SYan Zheng int ret; 30325d4f98a2SYan Zheng 303319b546d7SQu Wenruo if (btrfs_header_owner(leaf) != BTRFS_ROOT_TREE_OBJECTID) 303419b546d7SQu Wenruo return 0; 30355d4f98a2SYan Zheng 303619b546d7SQu Wenruo for (i = 0; i < btrfs_header_nritems(leaf); i++) { 303719b546d7SQu Wenruo btrfs_item_key_to_cpu(leaf, &key, i); 303819b546d7SQu Wenruo if (key.type != BTRFS_EXTENT_DATA_KEY) 303919b546d7SQu Wenruo continue; 304019b546d7SQu Wenruo ei = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 304119b546d7SQu Wenruo if (btrfs_file_extent_type(leaf, ei) == BTRFS_FILE_EXTENT_REG && 304219b546d7SQu Wenruo btrfs_file_extent_disk_bytenr(leaf, ei) == data_bytenr) { 304319b546d7SQu Wenruo found = true; 304419b546d7SQu Wenruo space_cache_ino = key.objectid; 304519b546d7SQu Wenruo break; 304619b546d7SQu Wenruo } 304719b546d7SQu Wenruo } 304819b546d7SQu Wenruo if (!found) 304919b546d7SQu Wenruo return -ENOENT; 305019b546d7SQu Wenruo ret = delete_block_group_cache(leaf->fs_info, block_group, NULL, 305119b546d7SQu Wenruo space_cache_ino); 30520af3d00bSJosef Bacik return ret; 30535d4f98a2SYan Zheng } 30545d4f98a2SYan Zheng 30555d4f98a2SYan Zheng /* 30562c016dc2SLiu Bo * helper to find all tree blocks that reference a given data extent 30575d4f98a2SYan Zheng */ 30585d4f98a2SYan Zheng static noinline_for_stack 30595d4f98a2SYan Zheng int add_data_references(struct reloc_control *rc, 30605d4f98a2SYan Zheng struct btrfs_key *extent_key, 30615d4f98a2SYan Zheng struct btrfs_path *path, 30625d4f98a2SYan Zheng struct rb_root *blocks) 30635d4f98a2SYan Zheng { 306419b546d7SQu Wenruo struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 306519b546d7SQu Wenruo struct ulist *leaves = NULL; 306619b546d7SQu Wenruo struct ulist_iterator leaf_uiter; 306719b546d7SQu Wenruo struct ulist_node *ref_node = NULL; 306819b546d7SQu Wenruo const u32 blocksize = fs_info->nodesize; 3069647f63bdSFilipe David Borba Manana int ret = 0; 30705d4f98a2SYan Zheng 3071b3b4aa74SDavid Sterba btrfs_release_path(path); 307219b546d7SQu Wenruo ret = btrfs_find_all_leafs(NULL, fs_info, extent_key->objectid, 307319b546d7SQu Wenruo 0, &leaves, NULL, true); 307419b546d7SQu Wenruo if (ret < 0) 307519b546d7SQu Wenruo return ret; 307619b546d7SQu Wenruo 307719b546d7SQu Wenruo ULIST_ITER_INIT(&leaf_uiter); 307819b546d7SQu Wenruo while ((ref_node = ulist_next(leaves, &leaf_uiter))) { 307919b546d7SQu Wenruo struct extent_buffer *eb; 308019b546d7SQu Wenruo 308119b546d7SQu Wenruo eb = read_tree_block(fs_info, ref_node->val, 0, 0, NULL); 308219b546d7SQu Wenruo if (IS_ERR(eb)) { 308319b546d7SQu Wenruo ret = PTR_ERR(eb); 308419b546d7SQu Wenruo break; 308519b546d7SQu Wenruo } 308619b546d7SQu Wenruo ret = delete_v1_space_cache(eb, rc->block_group, 308719b546d7SQu Wenruo extent_key->objectid); 308819b546d7SQu Wenruo free_extent_buffer(eb); 308919b546d7SQu Wenruo if (ret < 0) 309019b546d7SQu Wenruo break; 309119b546d7SQu Wenruo ret = __add_tree_block(rc, ref_node->val, blocksize, blocks); 309219b546d7SQu Wenruo if (ret < 0) 309319b546d7SQu Wenruo break; 309419b546d7SQu Wenruo } 309519b546d7SQu Wenruo if (ret < 0) 30965d4f98a2SYan Zheng free_block_list(blocks); 309719b546d7SQu Wenruo ulist_free(leaves); 309819b546d7SQu Wenruo return ret; 30995d4f98a2SYan Zheng } 31005d4f98a2SYan Zheng 31015d4f98a2SYan Zheng /* 31022c016dc2SLiu Bo * helper to find next unprocessed extent 31035d4f98a2SYan Zheng */ 31045d4f98a2SYan Zheng static noinline_for_stack 3105147d256eSZhaolei int find_next_extent(struct reloc_control *rc, struct btrfs_path *path, 31063fd0a558SYan, Zheng struct btrfs_key *extent_key) 31075d4f98a2SYan Zheng { 31080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31095d4f98a2SYan Zheng struct btrfs_key key; 31105d4f98a2SYan Zheng struct extent_buffer *leaf; 31115d4f98a2SYan Zheng u64 start, end, last; 31125d4f98a2SYan Zheng int ret; 31135d4f98a2SYan Zheng 3114b3470b5dSDavid Sterba last = rc->block_group->start + rc->block_group->length; 31155d4f98a2SYan Zheng while (1) { 31165d4f98a2SYan Zheng cond_resched(); 31175d4f98a2SYan Zheng if (rc->search_start >= last) { 31185d4f98a2SYan Zheng ret = 1; 31195d4f98a2SYan Zheng break; 31205d4f98a2SYan Zheng } 31215d4f98a2SYan Zheng 31225d4f98a2SYan Zheng key.objectid = rc->search_start; 31235d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 31245d4f98a2SYan Zheng key.offset = 0; 31255d4f98a2SYan Zheng 31265d4f98a2SYan Zheng path->search_commit_root = 1; 31275d4f98a2SYan Zheng path->skip_locking = 1; 31285d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 31295d4f98a2SYan Zheng 0, 0); 31305d4f98a2SYan Zheng if (ret < 0) 31315d4f98a2SYan Zheng break; 31325d4f98a2SYan Zheng next: 31335d4f98a2SYan Zheng leaf = path->nodes[0]; 31345d4f98a2SYan Zheng if (path->slots[0] >= btrfs_header_nritems(leaf)) { 31355d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 31365d4f98a2SYan Zheng if (ret != 0) 31375d4f98a2SYan Zheng break; 31385d4f98a2SYan Zheng leaf = path->nodes[0]; 31395d4f98a2SYan Zheng } 31405d4f98a2SYan Zheng 31415d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 31425d4f98a2SYan Zheng if (key.objectid >= last) { 31435d4f98a2SYan Zheng ret = 1; 31445d4f98a2SYan Zheng break; 31455d4f98a2SYan Zheng } 31465d4f98a2SYan Zheng 31473173a18fSJosef Bacik if (key.type != BTRFS_EXTENT_ITEM_KEY && 31483173a18fSJosef Bacik key.type != BTRFS_METADATA_ITEM_KEY) { 31493173a18fSJosef Bacik path->slots[0]++; 31503173a18fSJosef Bacik goto next; 31513173a18fSJosef Bacik } 31523173a18fSJosef Bacik 31533173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY && 31545d4f98a2SYan Zheng key.objectid + key.offset <= rc->search_start) { 31555d4f98a2SYan Zheng path->slots[0]++; 31565d4f98a2SYan Zheng goto next; 31575d4f98a2SYan Zheng } 31585d4f98a2SYan Zheng 31593173a18fSJosef Bacik if (key.type == BTRFS_METADATA_ITEM_KEY && 31600b246afaSJeff Mahoney key.objectid + fs_info->nodesize <= 31613173a18fSJosef Bacik rc->search_start) { 31623173a18fSJosef Bacik path->slots[0]++; 31633173a18fSJosef Bacik goto next; 31643173a18fSJosef Bacik } 31653173a18fSJosef Bacik 31665d4f98a2SYan Zheng ret = find_first_extent_bit(&rc->processed_blocks, 31675d4f98a2SYan Zheng key.objectid, &start, &end, 3168e6138876SJosef Bacik EXTENT_DIRTY, NULL); 31695d4f98a2SYan Zheng 31705d4f98a2SYan Zheng if (ret == 0 && start <= key.objectid) { 3171b3b4aa74SDavid Sterba btrfs_release_path(path); 31725d4f98a2SYan Zheng rc->search_start = end + 1; 31735d4f98a2SYan Zheng } else { 31743173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY) 31755d4f98a2SYan Zheng rc->search_start = key.objectid + key.offset; 31763173a18fSJosef Bacik else 31773173a18fSJosef Bacik rc->search_start = key.objectid + 31780b246afaSJeff Mahoney fs_info->nodesize; 31793fd0a558SYan, Zheng memcpy(extent_key, &key, sizeof(key)); 31805d4f98a2SYan Zheng return 0; 31815d4f98a2SYan Zheng } 31825d4f98a2SYan Zheng } 3183b3b4aa74SDavid Sterba btrfs_release_path(path); 31845d4f98a2SYan Zheng return ret; 31855d4f98a2SYan Zheng } 31865d4f98a2SYan Zheng 31875d4f98a2SYan Zheng static void set_reloc_control(struct reloc_control *rc) 31885d4f98a2SYan Zheng { 31895d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31907585717fSChris Mason 31917585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 31925d4f98a2SYan Zheng fs_info->reloc_ctl = rc; 31937585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 31945d4f98a2SYan Zheng } 31955d4f98a2SYan Zheng 31965d4f98a2SYan Zheng static void unset_reloc_control(struct reloc_control *rc) 31975d4f98a2SYan Zheng { 31985d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 31997585717fSChris Mason 32007585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 32015d4f98a2SYan Zheng fs_info->reloc_ctl = NULL; 32027585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 32035d4f98a2SYan Zheng } 32045d4f98a2SYan Zheng 32055d4f98a2SYan Zheng static int check_extent_flags(u64 flags) 32065d4f98a2SYan Zheng { 32075d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 32085d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 32095d4f98a2SYan Zheng return 1; 32105d4f98a2SYan Zheng if (!(flags & BTRFS_EXTENT_FLAG_DATA) && 32115d4f98a2SYan Zheng !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 32125d4f98a2SYan Zheng return 1; 32135d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 32145d4f98a2SYan Zheng (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) 32155d4f98a2SYan Zheng return 1; 32165d4f98a2SYan Zheng return 0; 32175d4f98a2SYan Zheng } 32185d4f98a2SYan Zheng 32193fd0a558SYan, Zheng static noinline_for_stack 32203fd0a558SYan, Zheng int prepare_to_relocate(struct reloc_control *rc) 32213fd0a558SYan, Zheng { 32223fd0a558SYan, Zheng struct btrfs_trans_handle *trans; 3223ac2fabacSJosef Bacik int ret; 32243fd0a558SYan, Zheng 32252ff7e61eSJeff Mahoney rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root->fs_info, 322666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 32273fd0a558SYan, Zheng if (!rc->block_rsv) 32283fd0a558SYan, Zheng return -ENOMEM; 32293fd0a558SYan, Zheng 32303fd0a558SYan, Zheng memset(&rc->cluster, 0, sizeof(rc->cluster)); 3231b3470b5dSDavid Sterba rc->search_start = rc->block_group->start; 32323fd0a558SYan, Zheng rc->extents_found = 0; 32333fd0a558SYan, Zheng rc->nodes_relocated = 0; 32343fd0a558SYan, Zheng rc->merging_rsv_size = 0; 32350647bf56SWang Shilong rc->reserved_bytes = 0; 3236da17066cSJeff Mahoney rc->block_rsv->size = rc->extent_root->fs_info->nodesize * 32370647bf56SWang Shilong RELOCATION_RESERVED_NODES; 3238ac2fabacSJosef Bacik ret = btrfs_block_rsv_refill(rc->extent_root, 3239ac2fabacSJosef Bacik rc->block_rsv, rc->block_rsv->size, 3240ac2fabacSJosef Bacik BTRFS_RESERVE_FLUSH_ALL); 3241ac2fabacSJosef Bacik if (ret) 3242ac2fabacSJosef Bacik return ret; 32433fd0a558SYan, Zheng 32443fd0a558SYan, Zheng rc->create_reloc_tree = 1; 32453fd0a558SYan, Zheng set_reloc_control(rc); 32463fd0a558SYan, Zheng 32477a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 324828818947SLiu Bo if (IS_ERR(trans)) { 324928818947SLiu Bo unset_reloc_control(rc); 325028818947SLiu Bo /* 325128818947SLiu Bo * extent tree is not a ref_cow tree and has no reloc_root to 325228818947SLiu Bo * cleanup. And callers are responsible to free the above 325328818947SLiu Bo * block rsv. 325428818947SLiu Bo */ 325528818947SLiu Bo return PTR_ERR(trans); 325628818947SLiu Bo } 32573a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 32583fd0a558SYan, Zheng return 0; 32593fd0a558SYan, Zheng } 326076dda93cSYan, Zheng 32615d4f98a2SYan Zheng static noinline_for_stack int relocate_block_group(struct reloc_control *rc) 32625d4f98a2SYan Zheng { 32632ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 32645d4f98a2SYan Zheng struct rb_root blocks = RB_ROOT; 32655d4f98a2SYan Zheng struct btrfs_key key; 32665d4f98a2SYan Zheng struct btrfs_trans_handle *trans = NULL; 32675d4f98a2SYan Zheng struct btrfs_path *path; 32685d4f98a2SYan Zheng struct btrfs_extent_item *ei; 32695d4f98a2SYan Zheng u64 flags; 32705d4f98a2SYan Zheng u32 item_size; 32715d4f98a2SYan Zheng int ret; 32725d4f98a2SYan Zheng int err = 0; 3273c87f08caSChris Mason int progress = 0; 32745d4f98a2SYan Zheng 32755d4f98a2SYan Zheng path = btrfs_alloc_path(); 32763fd0a558SYan, Zheng if (!path) 32775d4f98a2SYan Zheng return -ENOMEM; 3278e4058b54SDavid Sterba path->reada = READA_FORWARD; 32793fd0a558SYan, Zheng 32803fd0a558SYan, Zheng ret = prepare_to_relocate(rc); 32813fd0a558SYan, Zheng if (ret) { 32823fd0a558SYan, Zheng err = ret; 32833fd0a558SYan, Zheng goto out_free; 32842423fdfbSJiri Slaby } 32855d4f98a2SYan Zheng 32865d4f98a2SYan Zheng while (1) { 32870647bf56SWang Shilong rc->reserved_bytes = 0; 32880647bf56SWang Shilong ret = btrfs_block_rsv_refill(rc->extent_root, 32890647bf56SWang Shilong rc->block_rsv, rc->block_rsv->size, 32900647bf56SWang Shilong BTRFS_RESERVE_FLUSH_ALL); 32910647bf56SWang Shilong if (ret) { 32920647bf56SWang Shilong err = ret; 32930647bf56SWang Shilong break; 32940647bf56SWang Shilong } 3295c87f08caSChris Mason progress++; 3296a22285a6SYan, Zheng trans = btrfs_start_transaction(rc->extent_root, 0); 32970f788c58SLiu Bo if (IS_ERR(trans)) { 32980f788c58SLiu Bo err = PTR_ERR(trans); 32990f788c58SLiu Bo trans = NULL; 33000f788c58SLiu Bo break; 33010f788c58SLiu Bo } 3302c87f08caSChris Mason restart: 33033fd0a558SYan, Zheng if (update_backref_cache(trans, &rc->backref_cache)) { 33043a45bb20SJeff Mahoney btrfs_end_transaction(trans); 330542a657f5SPan Bian trans = NULL; 33063fd0a558SYan, Zheng continue; 33073fd0a558SYan, Zheng } 33083fd0a558SYan, Zheng 3309147d256eSZhaolei ret = find_next_extent(rc, path, &key); 33105d4f98a2SYan Zheng if (ret < 0) 33115d4f98a2SYan Zheng err = ret; 33125d4f98a2SYan Zheng if (ret != 0) 33135d4f98a2SYan Zheng break; 33145d4f98a2SYan Zheng 33155d4f98a2SYan Zheng rc->extents_found++; 33165d4f98a2SYan Zheng 33175d4f98a2SYan Zheng ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 33185d4f98a2SYan Zheng struct btrfs_extent_item); 33193fd0a558SYan, Zheng item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); 33205d4f98a2SYan Zheng if (item_size >= sizeof(*ei)) { 33215d4f98a2SYan Zheng flags = btrfs_extent_flags(path->nodes[0], ei); 33225d4f98a2SYan Zheng ret = check_extent_flags(flags); 33235d4f98a2SYan Zheng BUG_ON(ret); 33246d8ff4e4SDavid Sterba } else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) { 3325ba3c2b19SNikolay Borisov err = -EINVAL; 3326ba3c2b19SNikolay Borisov btrfs_print_v0_err(trans->fs_info); 3327ba3c2b19SNikolay Borisov btrfs_abort_transaction(trans, err); 3328ba3c2b19SNikolay Borisov break; 33295d4f98a2SYan Zheng } else { 33305d4f98a2SYan Zheng BUG(); 33315d4f98a2SYan Zheng } 33325d4f98a2SYan Zheng 33335d4f98a2SYan Zheng if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 33345d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, &blocks); 33355d4f98a2SYan Zheng } else if (rc->stage == UPDATE_DATA_PTRS && 33365d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 33375d4f98a2SYan Zheng ret = add_data_references(rc, &key, path, &blocks); 33385d4f98a2SYan Zheng } else { 3339b3b4aa74SDavid Sterba btrfs_release_path(path); 33405d4f98a2SYan Zheng ret = 0; 33415d4f98a2SYan Zheng } 33425d4f98a2SYan Zheng if (ret < 0) { 33433fd0a558SYan, Zheng err = ret; 33445d4f98a2SYan Zheng break; 33455d4f98a2SYan Zheng } 33465d4f98a2SYan Zheng 33475d4f98a2SYan Zheng if (!RB_EMPTY_ROOT(&blocks)) { 33485d4f98a2SYan Zheng ret = relocate_tree_blocks(trans, rc, &blocks); 33495d4f98a2SYan Zheng if (ret < 0) { 33503fd0a558SYan, Zheng if (ret != -EAGAIN) { 33515d4f98a2SYan Zheng err = ret; 33525d4f98a2SYan Zheng break; 33535d4f98a2SYan Zheng } 33543fd0a558SYan, Zheng rc->extents_found--; 33553fd0a558SYan, Zheng rc->search_start = key.objectid; 33563fd0a558SYan, Zheng } 33575d4f98a2SYan Zheng } 33585d4f98a2SYan Zheng 33593a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 33602ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 33613fd0a558SYan, Zheng trans = NULL; 33625d4f98a2SYan Zheng 33635d4f98a2SYan Zheng if (rc->stage == MOVE_DATA_EXTENTS && 33645d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 33655d4f98a2SYan Zheng rc->found_file_extent = 1; 33660257bb82SYan, Zheng ret = relocate_data_extent(rc->data_inode, 33673fd0a558SYan, Zheng &key, &rc->cluster); 33685d4f98a2SYan Zheng if (ret < 0) { 33695d4f98a2SYan Zheng err = ret; 33705d4f98a2SYan Zheng break; 33715d4f98a2SYan Zheng } 33725d4f98a2SYan Zheng } 3373f31ea088SQu Wenruo if (btrfs_should_cancel_balance(fs_info)) { 3374f31ea088SQu Wenruo err = -ECANCELED; 3375f31ea088SQu Wenruo break; 3376f31ea088SQu Wenruo } 33775d4f98a2SYan Zheng } 3378c87f08caSChris Mason if (trans && progress && err == -ENOSPC) { 337943a7e99dSNikolay Borisov ret = btrfs_force_chunk_alloc(trans, rc->block_group->flags); 33809689457bSShilong Wang if (ret == 1) { 3381c87f08caSChris Mason err = 0; 3382c87f08caSChris Mason progress = 0; 3383c87f08caSChris Mason goto restart; 3384c87f08caSChris Mason } 3385c87f08caSChris Mason } 33863fd0a558SYan, Zheng 3387b3b4aa74SDavid Sterba btrfs_release_path(path); 338891166212SDavid Sterba clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY); 33895d4f98a2SYan Zheng 33905d4f98a2SYan Zheng if (trans) { 33913a45bb20SJeff Mahoney btrfs_end_transaction_throttle(trans); 33922ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 33935d4f98a2SYan Zheng } 33945d4f98a2SYan Zheng 33950257bb82SYan, Zheng if (!err) { 33963fd0a558SYan, Zheng ret = relocate_file_extent_cluster(rc->data_inode, 33973fd0a558SYan, Zheng &rc->cluster); 33980257bb82SYan, Zheng if (ret < 0) 33990257bb82SYan, Zheng err = ret; 34000257bb82SYan, Zheng } 34010257bb82SYan, Zheng 34023fd0a558SYan, Zheng rc->create_reloc_tree = 0; 34033fd0a558SYan, Zheng set_reloc_control(rc); 34040257bb82SYan, Zheng 340513fe1bdbSQu Wenruo btrfs_backref_release_cache(&rc->backref_cache); 340663f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 34075d4f98a2SYan Zheng 34087f913c7cSQu Wenruo /* 34097f913c7cSQu Wenruo * Even in the case when the relocation is cancelled, we should all go 34107f913c7cSQu Wenruo * through prepare_to_merge() and merge_reloc_roots(). 34117f913c7cSQu Wenruo * 34127f913c7cSQu Wenruo * For error (including cancelled balance), prepare_to_merge() will 34137f913c7cSQu Wenruo * mark all reloc trees orphan, then queue them for cleanup in 34147f913c7cSQu Wenruo * merge_reloc_roots() 34157f913c7cSQu Wenruo */ 34163fd0a558SYan, Zheng err = prepare_to_merge(rc, err); 34175d4f98a2SYan Zheng 34185d4f98a2SYan Zheng merge_reloc_roots(rc); 34195d4f98a2SYan Zheng 34203fd0a558SYan, Zheng rc->merge_reloc_tree = 0; 34215d4f98a2SYan Zheng unset_reloc_control(rc); 342263f018beSNikolay Borisov btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1, NULL); 34235d4f98a2SYan Zheng 34245d4f98a2SYan Zheng /* get rid of pinned extents */ 34257a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 342662b99540SQu Wenruo if (IS_ERR(trans)) { 34273612b495STsutomu Itoh err = PTR_ERR(trans); 342862b99540SQu Wenruo goto out_free; 342962b99540SQu Wenruo } 34303a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 34316217b0faSJosef Bacik out_free: 3432d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3433d2311e69SQu Wenruo if (ret < 0 && !err) 3434d2311e69SQu Wenruo err = ret; 34352ff7e61eSJeff Mahoney btrfs_free_block_rsv(fs_info, rc->block_rsv); 34363fd0a558SYan, Zheng btrfs_free_path(path); 34375d4f98a2SYan Zheng return err; 34385d4f98a2SYan Zheng } 34395d4f98a2SYan Zheng 34405d4f98a2SYan Zheng static int __insert_orphan_inode(struct btrfs_trans_handle *trans, 34410257bb82SYan, Zheng struct btrfs_root *root, u64 objectid) 34425d4f98a2SYan Zheng { 34435d4f98a2SYan Zheng struct btrfs_path *path; 34445d4f98a2SYan Zheng struct btrfs_inode_item *item; 34455d4f98a2SYan Zheng struct extent_buffer *leaf; 34465d4f98a2SYan Zheng int ret; 34475d4f98a2SYan Zheng 34485d4f98a2SYan Zheng path = btrfs_alloc_path(); 34495d4f98a2SYan Zheng if (!path) 34505d4f98a2SYan Zheng return -ENOMEM; 34515d4f98a2SYan Zheng 34525d4f98a2SYan Zheng ret = btrfs_insert_empty_inode(trans, root, path, objectid); 34535d4f98a2SYan Zheng if (ret) 34545d4f98a2SYan Zheng goto out; 34555d4f98a2SYan Zheng 34565d4f98a2SYan Zheng leaf = path->nodes[0]; 34575d4f98a2SYan Zheng item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); 3458b159fa28SDavid Sterba memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item)); 34595d4f98a2SYan Zheng btrfs_set_inode_generation(leaf, item, 1); 34600257bb82SYan, Zheng btrfs_set_inode_size(leaf, item, 0); 34615d4f98a2SYan Zheng btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); 34623fd0a558SYan, Zheng btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | 34633fd0a558SYan, Zheng BTRFS_INODE_PREALLOC); 34645d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 34655d4f98a2SYan Zheng out: 34665d4f98a2SYan Zheng btrfs_free_path(path); 34675d4f98a2SYan Zheng return ret; 34685d4f98a2SYan Zheng } 34695d4f98a2SYan Zheng 34705d4f98a2SYan Zheng /* 34715d4f98a2SYan Zheng * helper to create inode for data relocation. 34725d4f98a2SYan Zheng * the inode is in data relocation tree and its link count is 0 34735d4f98a2SYan Zheng */ 34743fd0a558SYan, Zheng static noinline_for_stack 34753fd0a558SYan, Zheng struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, 347632da5386SDavid Sterba struct btrfs_block_group *group) 34775d4f98a2SYan Zheng { 34785d4f98a2SYan Zheng struct inode *inode = NULL; 34795d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 34805d4f98a2SYan Zheng struct btrfs_root *root; 34815d4f98a2SYan Zheng struct btrfs_key key; 34824624900dSZhaolei u64 objectid; 34835d4f98a2SYan Zheng int err = 0; 34845d4f98a2SYan Zheng 3485aeb935a4SQu Wenruo root = btrfs_grab_root(fs_info->data_reloc_root); 3486a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 348776deacf0SJosef Bacik if (IS_ERR(trans)) { 348800246528SJosef Bacik btrfs_put_root(root); 34893fd0a558SYan, Zheng return ERR_CAST(trans); 349076deacf0SJosef Bacik } 34915d4f98a2SYan Zheng 3492581bb050SLi Zefan err = btrfs_find_free_objectid(root, &objectid); 34935d4f98a2SYan Zheng if (err) 34945d4f98a2SYan Zheng goto out; 34955d4f98a2SYan Zheng 34960257bb82SYan, Zheng err = __insert_orphan_inode(trans, root, objectid); 34975d4f98a2SYan Zheng BUG_ON(err); 34985d4f98a2SYan Zheng 34995d4f98a2SYan Zheng key.objectid = objectid; 35005d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 35015d4f98a2SYan Zheng key.offset = 0; 35024c66e0d4SDavid Sterba inode = btrfs_iget(fs_info->sb, &key, root); 35032e19f1f9SAl Viro BUG_ON(IS_ERR(inode)); 3504b3470b5dSDavid Sterba BTRFS_I(inode)->index_cnt = group->start; 35055d4f98a2SYan Zheng 350673f2e545SNikolay Borisov err = btrfs_orphan_add(trans, BTRFS_I(inode)); 35075d4f98a2SYan Zheng out: 350800246528SJosef Bacik btrfs_put_root(root); 35093a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35102ff7e61eSJeff Mahoney btrfs_btree_balance_dirty(fs_info); 35115d4f98a2SYan Zheng if (err) { 35125d4f98a2SYan Zheng if (inode) 35135d4f98a2SYan Zheng iput(inode); 35145d4f98a2SYan Zheng inode = ERR_PTR(err); 35155d4f98a2SYan Zheng } 35165d4f98a2SYan Zheng return inode; 35175d4f98a2SYan Zheng } 35185d4f98a2SYan Zheng 3519c258d6e3SQu Wenruo static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) 35203fd0a558SYan, Zheng { 35213fd0a558SYan, Zheng struct reloc_control *rc; 35223fd0a558SYan, Zheng 35233fd0a558SYan, Zheng rc = kzalloc(sizeof(*rc), GFP_NOFS); 35243fd0a558SYan, Zheng if (!rc) 35253fd0a558SYan, Zheng return NULL; 35263fd0a558SYan, Zheng 35273fd0a558SYan, Zheng INIT_LIST_HEAD(&rc->reloc_roots); 3528d2311e69SQu Wenruo INIT_LIST_HEAD(&rc->dirty_subvol_roots); 3529584fb121SQu Wenruo btrfs_backref_init_cache(fs_info, &rc->backref_cache, 1); 35303fd0a558SYan, Zheng mapping_tree_init(&rc->reloc_root_tree); 353143eb5f29SQu Wenruo extent_io_tree_init(fs_info, &rc->processed_blocks, 353243eb5f29SQu Wenruo IO_TREE_RELOC_BLOCKS, NULL); 35333fd0a558SYan, Zheng return rc; 35343fd0a558SYan, Zheng } 35353fd0a558SYan, Zheng 35361a0afa0eSJosef Bacik static void free_reloc_control(struct reloc_control *rc) 35371a0afa0eSJosef Bacik { 35381a0afa0eSJosef Bacik struct mapping_node *node, *tmp; 35391a0afa0eSJosef Bacik 35401a0afa0eSJosef Bacik free_reloc_roots(&rc->reloc_roots); 35411a0afa0eSJosef Bacik rbtree_postorder_for_each_entry_safe(node, tmp, 35421a0afa0eSJosef Bacik &rc->reloc_root_tree.rb_root, rb_node) 35431a0afa0eSJosef Bacik kfree(node); 35441a0afa0eSJosef Bacik 35451a0afa0eSJosef Bacik kfree(rc); 35461a0afa0eSJosef Bacik } 35471a0afa0eSJosef Bacik 35485d4f98a2SYan Zheng /* 3549ebce0e01SAdam Borowski * Print the block group being relocated 3550ebce0e01SAdam Borowski */ 3551ebce0e01SAdam Borowski static void describe_relocation(struct btrfs_fs_info *fs_info, 355232da5386SDavid Sterba struct btrfs_block_group *block_group) 3553ebce0e01SAdam Borowski { 3554f89e09cfSAnand Jain char buf[128] = {'\0'}; 3555ebce0e01SAdam Borowski 3556f89e09cfSAnand Jain btrfs_describe_block_groups(block_group->flags, buf, sizeof(buf)); 3557ebce0e01SAdam Borowski 3558ebce0e01SAdam Borowski btrfs_info(fs_info, 3559ebce0e01SAdam Borowski "relocating block group %llu flags %s", 3560b3470b5dSDavid Sterba block_group->start, buf); 3561ebce0e01SAdam Borowski } 3562ebce0e01SAdam Borowski 3563430640e3SQu Wenruo static const char *stage_to_string(int stage) 3564430640e3SQu Wenruo { 3565430640e3SQu Wenruo if (stage == MOVE_DATA_EXTENTS) 3566430640e3SQu Wenruo return "move data extents"; 3567430640e3SQu Wenruo if (stage == UPDATE_DATA_PTRS) 3568430640e3SQu Wenruo return "update data pointers"; 3569430640e3SQu Wenruo return "unknown"; 3570430640e3SQu Wenruo } 3571430640e3SQu Wenruo 3572ebce0e01SAdam Borowski /* 35735d4f98a2SYan Zheng * function to relocate all extents in a block group. 35745d4f98a2SYan Zheng */ 35756bccf3abSJeff Mahoney int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start) 35765d4f98a2SYan Zheng { 357732da5386SDavid Sterba struct btrfs_block_group *bg; 35786bccf3abSJeff Mahoney struct btrfs_root *extent_root = fs_info->extent_root; 35795d4f98a2SYan Zheng struct reloc_control *rc; 35800af3d00bSJosef Bacik struct inode *inode; 35810af3d00bSJosef Bacik struct btrfs_path *path; 35825d4f98a2SYan Zheng int ret; 3583f0486c68SYan, Zheng int rw = 0; 35845d4f98a2SYan Zheng int err = 0; 35855d4f98a2SYan Zheng 3586eede2bf3SOmar Sandoval bg = btrfs_lookup_block_group(fs_info, group_start); 3587eede2bf3SOmar Sandoval if (!bg) 3588eede2bf3SOmar Sandoval return -ENOENT; 3589eede2bf3SOmar Sandoval 3590eede2bf3SOmar Sandoval if (btrfs_pinned_by_swapfile(fs_info, bg)) { 3591eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 3592eede2bf3SOmar Sandoval return -ETXTBSY; 3593eede2bf3SOmar Sandoval } 3594eede2bf3SOmar Sandoval 3595c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 3596eede2bf3SOmar Sandoval if (!rc) { 3597eede2bf3SOmar Sandoval btrfs_put_block_group(bg); 35985d4f98a2SYan Zheng return -ENOMEM; 3599eede2bf3SOmar Sandoval } 36005d4f98a2SYan Zheng 3601f0486c68SYan, Zheng rc->extent_root = extent_root; 3602eede2bf3SOmar Sandoval rc->block_group = bg; 36035d4f98a2SYan Zheng 3604b12de528SQu Wenruo ret = btrfs_inc_block_group_ro(rc->block_group, true); 3605f0486c68SYan, Zheng if (ret) { 3606f0486c68SYan, Zheng err = ret; 3607f0486c68SYan, Zheng goto out; 3608f0486c68SYan, Zheng } 3609f0486c68SYan, Zheng rw = 1; 3610f0486c68SYan, Zheng 36110af3d00bSJosef Bacik path = btrfs_alloc_path(); 36120af3d00bSJosef Bacik if (!path) { 36130af3d00bSJosef Bacik err = -ENOMEM; 36140af3d00bSJosef Bacik goto out; 36150af3d00bSJosef Bacik } 36160af3d00bSJosef Bacik 36177949f339SDavid Sterba inode = lookup_free_space_inode(rc->block_group, path); 36180af3d00bSJosef Bacik btrfs_free_path(path); 36190af3d00bSJosef Bacik 36200af3d00bSJosef Bacik if (!IS_ERR(inode)) 36211bbc621eSChris Mason ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0); 36220af3d00bSJosef Bacik else 36230af3d00bSJosef Bacik ret = PTR_ERR(inode); 36240af3d00bSJosef Bacik 36250af3d00bSJosef Bacik if (ret && ret != -ENOENT) { 36260af3d00bSJosef Bacik err = ret; 36270af3d00bSJosef Bacik goto out; 36280af3d00bSJosef Bacik } 36290af3d00bSJosef Bacik 36305d4f98a2SYan Zheng rc->data_inode = create_reloc_inode(fs_info, rc->block_group); 36315d4f98a2SYan Zheng if (IS_ERR(rc->data_inode)) { 36325d4f98a2SYan Zheng err = PTR_ERR(rc->data_inode); 36335d4f98a2SYan Zheng rc->data_inode = NULL; 36345d4f98a2SYan Zheng goto out; 36355d4f98a2SYan Zheng } 36365d4f98a2SYan Zheng 36370b246afaSJeff Mahoney describe_relocation(fs_info, rc->block_group); 36385d4f98a2SYan Zheng 36399cfa3e34SFilipe Manana btrfs_wait_block_group_reservations(rc->block_group); 3640f78c436cSFilipe Manana btrfs_wait_nocow_writers(rc->block_group); 36416374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 3642b3470b5dSDavid Sterba rc->block_group->start, 3643b3470b5dSDavid Sterba rc->block_group->length); 36445d4f98a2SYan Zheng 36455d4f98a2SYan Zheng while (1) { 3646430640e3SQu Wenruo int finishes_stage; 3647430640e3SQu Wenruo 364876dda93cSYan, Zheng mutex_lock(&fs_info->cleaner_mutex); 36495d4f98a2SYan Zheng ret = relocate_block_group(rc); 365076dda93cSYan, Zheng mutex_unlock(&fs_info->cleaner_mutex); 3651ff612ba7SJosef Bacik if (ret < 0) 36525d4f98a2SYan Zheng err = ret; 3653ff612ba7SJosef Bacik 3654430640e3SQu Wenruo finishes_stage = rc->stage; 3655ff612ba7SJosef Bacik /* 3656ff612ba7SJosef Bacik * We may have gotten ENOSPC after we already dirtied some 3657ff612ba7SJosef Bacik * extents. If writeout happens while we're relocating a 3658ff612ba7SJosef Bacik * different block group we could end up hitting the 3659ff612ba7SJosef Bacik * BUG_ON(rc->stage == UPDATE_DATA_PTRS) in 3660ff612ba7SJosef Bacik * btrfs_reloc_cow_block. Make sure we write everything out 3661ff612ba7SJosef Bacik * properly so we don't trip over this problem, and then break 3662ff612ba7SJosef Bacik * out of the loop if we hit an error. 3663ff612ba7SJosef Bacik */ 3664ff612ba7SJosef Bacik if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { 3665ff612ba7SJosef Bacik ret = btrfs_wait_ordered_range(rc->data_inode, 0, 3666ff612ba7SJosef Bacik (u64)-1); 3667ff612ba7SJosef Bacik if (ret) 3668ff612ba7SJosef Bacik err = ret; 3669ff612ba7SJosef Bacik invalidate_mapping_pages(rc->data_inode->i_mapping, 3670ff612ba7SJosef Bacik 0, -1); 3671ff612ba7SJosef Bacik rc->stage = UPDATE_DATA_PTRS; 36725d4f98a2SYan Zheng } 36735d4f98a2SYan Zheng 3674ff612ba7SJosef Bacik if (err < 0) 3675ff612ba7SJosef Bacik goto out; 3676ff612ba7SJosef Bacik 36775d4f98a2SYan Zheng if (rc->extents_found == 0) 36785d4f98a2SYan Zheng break; 36795d4f98a2SYan Zheng 3680430640e3SQu Wenruo btrfs_info(fs_info, "found %llu extents, stage: %s", 3681430640e3SQu Wenruo rc->extents_found, stage_to_string(finishes_stage)); 36825d4f98a2SYan Zheng } 36835d4f98a2SYan Zheng 36845d4f98a2SYan Zheng WARN_ON(rc->block_group->pinned > 0); 36855d4f98a2SYan Zheng WARN_ON(rc->block_group->reserved > 0); 3686bf38be65SDavid Sterba WARN_ON(rc->block_group->used > 0); 36875d4f98a2SYan Zheng out: 3688f0486c68SYan, Zheng if (err && rw) 36892ff7e61eSJeff Mahoney btrfs_dec_block_group_ro(rc->block_group); 36905d4f98a2SYan Zheng iput(rc->data_inode); 36915d4f98a2SYan Zheng btrfs_put_block_group(rc->block_group); 36921a0afa0eSJosef Bacik free_reloc_control(rc); 36935d4f98a2SYan Zheng return err; 36945d4f98a2SYan Zheng } 36955d4f98a2SYan Zheng 369676dda93cSYan, Zheng static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) 369776dda93cSYan, Zheng { 36980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 369976dda93cSYan, Zheng struct btrfs_trans_handle *trans; 370079787eaaSJeff Mahoney int ret, err; 370176dda93cSYan, Zheng 37020b246afaSJeff Mahoney trans = btrfs_start_transaction(fs_info->tree_root, 0); 370379787eaaSJeff Mahoney if (IS_ERR(trans)) 370479787eaaSJeff Mahoney return PTR_ERR(trans); 370576dda93cSYan, Zheng 370676dda93cSYan, Zheng memset(&root->root_item.drop_progress, 0, 370776dda93cSYan, Zheng sizeof(root->root_item.drop_progress)); 370876dda93cSYan, Zheng root->root_item.drop_level = 0; 370976dda93cSYan, Zheng btrfs_set_root_refs(&root->root_item, 0); 37100b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 371176dda93cSYan, Zheng &root->root_key, &root->root_item); 371276dda93cSYan, Zheng 37133a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 371479787eaaSJeff Mahoney if (err) 371579787eaaSJeff Mahoney return err; 371679787eaaSJeff Mahoney return ret; 371776dda93cSYan, Zheng } 371876dda93cSYan, Zheng 37195d4f98a2SYan Zheng /* 37205d4f98a2SYan Zheng * recover relocation interrupted by system crash. 37215d4f98a2SYan Zheng * 37225d4f98a2SYan Zheng * this function resumes merging reloc trees with corresponding fs trees. 37235d4f98a2SYan Zheng * this is important for keeping the sharing of tree blocks 37245d4f98a2SYan Zheng */ 37255d4f98a2SYan Zheng int btrfs_recover_relocation(struct btrfs_root *root) 37265d4f98a2SYan Zheng { 37270b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 37285d4f98a2SYan Zheng LIST_HEAD(reloc_roots); 37295d4f98a2SYan Zheng struct btrfs_key key; 37305d4f98a2SYan Zheng struct btrfs_root *fs_root; 37315d4f98a2SYan Zheng struct btrfs_root *reloc_root; 37325d4f98a2SYan Zheng struct btrfs_path *path; 37335d4f98a2SYan Zheng struct extent_buffer *leaf; 37345d4f98a2SYan Zheng struct reloc_control *rc = NULL; 37355d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 37365d4f98a2SYan Zheng int ret; 37375d4f98a2SYan Zheng int err = 0; 37385d4f98a2SYan Zheng 37395d4f98a2SYan Zheng path = btrfs_alloc_path(); 37405d4f98a2SYan Zheng if (!path) 37415d4f98a2SYan Zheng return -ENOMEM; 3742e4058b54SDavid Sterba path->reada = READA_BACK; 37435d4f98a2SYan Zheng 37445d4f98a2SYan Zheng key.objectid = BTRFS_TREE_RELOC_OBJECTID; 37455d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 37465d4f98a2SYan Zheng key.offset = (u64)-1; 37475d4f98a2SYan Zheng 37485d4f98a2SYan Zheng while (1) { 37490b246afaSJeff Mahoney ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, 37505d4f98a2SYan Zheng path, 0, 0); 37515d4f98a2SYan Zheng if (ret < 0) { 37525d4f98a2SYan Zheng err = ret; 37535d4f98a2SYan Zheng goto out; 37545d4f98a2SYan Zheng } 37555d4f98a2SYan Zheng if (ret > 0) { 37565d4f98a2SYan Zheng if (path->slots[0] == 0) 37575d4f98a2SYan Zheng break; 37585d4f98a2SYan Zheng path->slots[0]--; 37595d4f98a2SYan Zheng } 37605d4f98a2SYan Zheng leaf = path->nodes[0]; 37615d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 3762b3b4aa74SDavid Sterba btrfs_release_path(path); 37635d4f98a2SYan Zheng 37645d4f98a2SYan Zheng if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || 37655d4f98a2SYan Zheng key.type != BTRFS_ROOT_ITEM_KEY) 37665d4f98a2SYan Zheng break; 37675d4f98a2SYan Zheng 37683dbf1738SJosef Bacik reloc_root = btrfs_read_tree_root(root, &key); 37695d4f98a2SYan Zheng if (IS_ERR(reloc_root)) { 37705d4f98a2SYan Zheng err = PTR_ERR(reloc_root); 37715d4f98a2SYan Zheng goto out; 37725d4f98a2SYan Zheng } 37735d4f98a2SYan Zheng 377492a7cc42SQu Wenruo set_bit(BTRFS_ROOT_SHAREABLE, &reloc_root->state); 37755d4f98a2SYan Zheng list_add(&reloc_root->root_list, &reloc_roots); 37765d4f98a2SYan Zheng 37775d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 37780b246afaSJeff Mahoney fs_root = read_fs_root(fs_info, 37795d4f98a2SYan Zheng reloc_root->root_key.offset); 37805d4f98a2SYan Zheng if (IS_ERR(fs_root)) { 378176dda93cSYan, Zheng ret = PTR_ERR(fs_root); 378276dda93cSYan, Zheng if (ret != -ENOENT) { 378376dda93cSYan, Zheng err = ret; 37845d4f98a2SYan Zheng goto out; 37855d4f98a2SYan Zheng } 378679787eaaSJeff Mahoney ret = mark_garbage_root(reloc_root); 378779787eaaSJeff Mahoney if (ret < 0) { 378879787eaaSJeff Mahoney err = ret; 378979787eaaSJeff Mahoney goto out; 379079787eaaSJeff Mahoney } 3791932fd26dSJosef Bacik } else { 379200246528SJosef Bacik btrfs_put_root(fs_root); 379376dda93cSYan, Zheng } 37945d4f98a2SYan Zheng } 37955d4f98a2SYan Zheng 37965d4f98a2SYan Zheng if (key.offset == 0) 37975d4f98a2SYan Zheng break; 37985d4f98a2SYan Zheng 37995d4f98a2SYan Zheng key.offset--; 38005d4f98a2SYan Zheng } 3801b3b4aa74SDavid Sterba btrfs_release_path(path); 38025d4f98a2SYan Zheng 38035d4f98a2SYan Zheng if (list_empty(&reloc_roots)) 38045d4f98a2SYan Zheng goto out; 38055d4f98a2SYan Zheng 3806c258d6e3SQu Wenruo rc = alloc_reloc_control(fs_info); 38075d4f98a2SYan Zheng if (!rc) { 38085d4f98a2SYan Zheng err = -ENOMEM; 38095d4f98a2SYan Zheng goto out; 38105d4f98a2SYan Zheng } 38115d4f98a2SYan Zheng 38120b246afaSJeff Mahoney rc->extent_root = fs_info->extent_root; 38135d4f98a2SYan Zheng 38145d4f98a2SYan Zheng set_reloc_control(rc); 38155d4f98a2SYan Zheng 38167a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 38173612b495STsutomu Itoh if (IS_ERR(trans)) { 38183612b495STsutomu Itoh err = PTR_ERR(trans); 3819fb2d83eeSJosef Bacik goto out_unset; 38203612b495STsutomu Itoh } 38213fd0a558SYan, Zheng 38223fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 38233fd0a558SYan, Zheng 38245d4f98a2SYan Zheng while (!list_empty(&reloc_roots)) { 38255d4f98a2SYan Zheng reloc_root = list_entry(reloc_roots.next, 38265d4f98a2SYan Zheng struct btrfs_root, root_list); 38275d4f98a2SYan Zheng list_del(&reloc_root->root_list); 38285d4f98a2SYan Zheng 38295d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) == 0) { 38305d4f98a2SYan Zheng list_add_tail(&reloc_root->root_list, 38315d4f98a2SYan Zheng &rc->reloc_roots); 38325d4f98a2SYan Zheng continue; 38335d4f98a2SYan Zheng } 38345d4f98a2SYan Zheng 38350b246afaSJeff Mahoney fs_root = read_fs_root(fs_info, reloc_root->root_key.offset); 383679787eaaSJeff Mahoney if (IS_ERR(fs_root)) { 383779787eaaSJeff Mahoney err = PTR_ERR(fs_root); 3838ca1aa281SJosef Bacik list_add_tail(&reloc_root->root_list, &reloc_roots); 38391402d17dSXiyu Yang btrfs_end_transaction(trans); 3840fb2d83eeSJosef Bacik goto out_unset; 384179787eaaSJeff Mahoney } 38425d4f98a2SYan Zheng 3843ffd7b339SJeff Mahoney err = __add_reloc_root(reloc_root); 384479787eaaSJeff Mahoney BUG_ON(err < 0); /* -ENOMEM or logic error */ 3845f44deb74SJosef Bacik fs_root->reloc_root = btrfs_grab_root(reloc_root); 384600246528SJosef Bacik btrfs_put_root(fs_root); 38475d4f98a2SYan Zheng } 38485d4f98a2SYan Zheng 38493a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 385079787eaaSJeff Mahoney if (err) 3851fb2d83eeSJosef Bacik goto out_unset; 38525d4f98a2SYan Zheng 38535d4f98a2SYan Zheng merge_reloc_roots(rc); 38545d4f98a2SYan Zheng 38555d4f98a2SYan Zheng unset_reloc_control(rc); 38565d4f98a2SYan Zheng 38577a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 385862b99540SQu Wenruo if (IS_ERR(trans)) { 38593612b495STsutomu Itoh err = PTR_ERR(trans); 38606217b0faSJosef Bacik goto out_clean; 386162b99540SQu Wenruo } 38623a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 38636217b0faSJosef Bacik out_clean: 3864d2311e69SQu Wenruo ret = clean_dirty_subvols(rc); 3865d2311e69SQu Wenruo if (ret < 0 && !err) 3866d2311e69SQu Wenruo err = ret; 3867fb2d83eeSJosef Bacik out_unset: 3868fb2d83eeSJosef Bacik unset_reloc_control(rc); 38691a0afa0eSJosef Bacik free_reloc_control(rc); 38703612b495STsutomu Itoh out: 3871aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 3872aca1bba6SLiu Bo 38735d4f98a2SYan Zheng btrfs_free_path(path); 38745d4f98a2SYan Zheng 38755d4f98a2SYan Zheng if (err == 0) { 38765d4f98a2SYan Zheng /* cleanup orphan inode in data relocation tree */ 3877aeb935a4SQu Wenruo fs_root = btrfs_grab_root(fs_info->data_reloc_root); 3878aeb935a4SQu Wenruo ASSERT(fs_root); 387966b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_root); 388000246528SJosef Bacik btrfs_put_root(fs_root); 3881932fd26dSJosef Bacik } 38825d4f98a2SYan Zheng return err; 38835d4f98a2SYan Zheng } 38845d4f98a2SYan Zheng 38855d4f98a2SYan Zheng /* 38865d4f98a2SYan Zheng * helper to add ordered checksum for data relocation. 38875d4f98a2SYan Zheng * 38885d4f98a2SYan Zheng * cloning checksum properly handles the nodatasum extents. 38895d4f98a2SYan Zheng * it also saves CPU time to re-calculate the checksum. 38905d4f98a2SYan Zheng */ 38915d4f98a2SYan Zheng int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) 38925d4f98a2SYan Zheng { 38930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38945d4f98a2SYan Zheng struct btrfs_ordered_sum *sums; 38955d4f98a2SYan Zheng struct btrfs_ordered_extent *ordered; 38965d4f98a2SYan Zheng int ret; 38975d4f98a2SYan Zheng u64 disk_bytenr; 38984577b014SJosef Bacik u64 new_bytenr; 38995d4f98a2SYan Zheng LIST_HEAD(list); 39005d4f98a2SYan Zheng 39015d4f98a2SYan Zheng ordered = btrfs_lookup_ordered_extent(inode, file_pos); 3902bffe633eSOmar Sandoval BUG_ON(ordered->file_offset != file_pos || ordered->num_bytes != len); 39035d4f98a2SYan Zheng 39045d4f98a2SYan Zheng disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; 39050b246afaSJeff Mahoney ret = btrfs_lookup_csums_range(fs_info->csum_root, disk_bytenr, 3906a2de733cSArne Jansen disk_bytenr + len - 1, &list, 0); 390779787eaaSJeff Mahoney if (ret) 390879787eaaSJeff Mahoney goto out; 39095d4f98a2SYan Zheng 39105d4f98a2SYan Zheng while (!list_empty(&list)) { 39115d4f98a2SYan Zheng sums = list_entry(list.next, struct btrfs_ordered_sum, list); 39125d4f98a2SYan Zheng list_del_init(&sums->list); 39135d4f98a2SYan Zheng 39144577b014SJosef Bacik /* 39154577b014SJosef Bacik * We need to offset the new_bytenr based on where the csum is. 39164577b014SJosef Bacik * We need to do this because we will read in entire prealloc 39174577b014SJosef Bacik * extents but we may have written to say the middle of the 39184577b014SJosef Bacik * prealloc extent, so we need to make sure the csum goes with 39194577b014SJosef Bacik * the right disk offset. 39204577b014SJosef Bacik * 39214577b014SJosef Bacik * We can do this because the data reloc inode refers strictly 39224577b014SJosef Bacik * to the on disk bytes, so we don't have to worry about 39234577b014SJosef Bacik * disk_len vs real len like with real inodes since it's all 39244577b014SJosef Bacik * disk length. 39254577b014SJosef Bacik */ 3926bffe633eSOmar Sandoval new_bytenr = ordered->disk_bytenr + sums->bytenr - disk_bytenr; 39274577b014SJosef Bacik sums->bytenr = new_bytenr; 39285d4f98a2SYan Zheng 3929f9756261SNikolay Borisov btrfs_add_ordered_sum(ordered, sums); 39305d4f98a2SYan Zheng } 393179787eaaSJeff Mahoney out: 39325d4f98a2SYan Zheng btrfs_put_ordered_extent(ordered); 3933411fc6bcSAndi Kleen return ret; 39345d4f98a2SYan Zheng } 39353fd0a558SYan, Zheng 393683d4cfd4SJosef Bacik int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 39373fd0a558SYan, Zheng struct btrfs_root *root, struct extent_buffer *buf, 39383fd0a558SYan, Zheng struct extent_buffer *cow) 39393fd0a558SYan, Zheng { 39400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 39413fd0a558SYan, Zheng struct reloc_control *rc; 3942a26195a5SQu Wenruo struct btrfs_backref_node *node; 39433fd0a558SYan, Zheng int first_cow = 0; 39443fd0a558SYan, Zheng int level; 394583d4cfd4SJosef Bacik int ret = 0; 39463fd0a558SYan, Zheng 39470b246afaSJeff Mahoney rc = fs_info->reloc_ctl; 39483fd0a558SYan, Zheng if (!rc) 394983d4cfd4SJosef Bacik return 0; 39503fd0a558SYan, Zheng 39513fd0a558SYan, Zheng BUG_ON(rc->stage == UPDATE_DATA_PTRS && 39523fd0a558SYan, Zheng root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); 39533fd0a558SYan, Zheng 39543fd0a558SYan, Zheng level = btrfs_header_level(buf); 39553fd0a558SYan, Zheng if (btrfs_header_generation(buf) <= 39563fd0a558SYan, Zheng btrfs_root_last_snapshot(&root->root_item)) 39573fd0a558SYan, Zheng first_cow = 1; 39583fd0a558SYan, Zheng 39593fd0a558SYan, Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && 39603fd0a558SYan, Zheng rc->create_reloc_tree) { 39613fd0a558SYan, Zheng WARN_ON(!first_cow && level == 0); 39623fd0a558SYan, Zheng 39633fd0a558SYan, Zheng node = rc->backref_cache.path[level]; 39643fd0a558SYan, Zheng BUG_ON(node->bytenr != buf->start && 39653fd0a558SYan, Zheng node->new_bytenr != buf->start); 39663fd0a558SYan, Zheng 3967b0fe7078SQu Wenruo btrfs_backref_drop_node_buffer(node); 396867439dadSDavid Sterba atomic_inc(&cow->refs); 39693fd0a558SYan, Zheng node->eb = cow; 39703fd0a558SYan, Zheng node->new_bytenr = cow->start; 39713fd0a558SYan, Zheng 39723fd0a558SYan, Zheng if (!node->pending) { 39733fd0a558SYan, Zheng list_move_tail(&node->list, 39743fd0a558SYan, Zheng &rc->backref_cache.pending[level]); 39753fd0a558SYan, Zheng node->pending = 1; 39763fd0a558SYan, Zheng } 39773fd0a558SYan, Zheng 39783fd0a558SYan, Zheng if (first_cow) 39799569cc20SQu Wenruo mark_block_processed(rc, node); 39803fd0a558SYan, Zheng 39813fd0a558SYan, Zheng if (first_cow && level > 0) 39823fd0a558SYan, Zheng rc->nodes_relocated += buf->len; 39833fd0a558SYan, Zheng } 39843fd0a558SYan, Zheng 398583d4cfd4SJosef Bacik if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) 39863fd0a558SYan, Zheng ret = replace_file_extents(trans, rc, root, cow); 398783d4cfd4SJosef Bacik return ret; 39883fd0a558SYan, Zheng } 39893fd0a558SYan, Zheng 39903fd0a558SYan, Zheng /* 39913fd0a558SYan, Zheng * called before creating snapshot. it calculates metadata reservation 399201327610SNicholas D Steeves * required for relocating tree blocks in the snapshot 39933fd0a558SYan, Zheng */ 3994147d256eSZhaolei void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 39953fd0a558SYan, Zheng u64 *bytes_to_reserve) 39963fd0a558SYan, Zheng { 399710995c04SQu Wenruo struct btrfs_root *root = pending->root; 399810995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 39993fd0a558SYan, Zheng 40006282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 40013fd0a558SYan, Zheng return; 40023fd0a558SYan, Zheng 40033fd0a558SYan, Zheng if (!rc->merge_reloc_tree) 40043fd0a558SYan, Zheng return; 40053fd0a558SYan, Zheng 40063fd0a558SYan, Zheng root = root->reloc_root; 40073fd0a558SYan, Zheng BUG_ON(btrfs_root_refs(&root->root_item) == 0); 40083fd0a558SYan, Zheng /* 40093fd0a558SYan, Zheng * relocation is in the stage of merging trees. the space 40103fd0a558SYan, Zheng * used by merging a reloc tree is twice the size of 40113fd0a558SYan, Zheng * relocated tree nodes in the worst case. half for cowing 40123fd0a558SYan, Zheng * the reloc tree, half for cowing the fs tree. the space 40133fd0a558SYan, Zheng * used by cowing the reloc tree will be freed after the 40143fd0a558SYan, Zheng * tree is dropped. if we create snapshot, cowing the fs 40153fd0a558SYan, Zheng * tree may use more space than it frees. so we need 40163fd0a558SYan, Zheng * reserve extra space. 40173fd0a558SYan, Zheng */ 40183fd0a558SYan, Zheng *bytes_to_reserve += rc->nodes_relocated; 40193fd0a558SYan, Zheng } 40203fd0a558SYan, Zheng 40213fd0a558SYan, Zheng /* 40223fd0a558SYan, Zheng * called after snapshot is created. migrate block reservation 40233fd0a558SYan, Zheng * and create reloc root for the newly created snapshot 4024f44deb74SJosef Bacik * 4025f44deb74SJosef Bacik * This is similar to btrfs_init_reloc_root(), we come out of here with two 4026f44deb74SJosef Bacik * references held on the reloc_root, one for root->reloc_root and one for 4027f44deb74SJosef Bacik * rc->reloc_roots. 40283fd0a558SYan, Zheng */ 402949b25e05SJeff Mahoney int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 40303fd0a558SYan, Zheng struct btrfs_pending_snapshot *pending) 40313fd0a558SYan, Zheng { 40323fd0a558SYan, Zheng struct btrfs_root *root = pending->root; 40333fd0a558SYan, Zheng struct btrfs_root *reloc_root; 40343fd0a558SYan, Zheng struct btrfs_root *new_root; 403510995c04SQu Wenruo struct reloc_control *rc = root->fs_info->reloc_ctl; 40363fd0a558SYan, Zheng int ret; 40373fd0a558SYan, Zheng 40386282675eSQu Wenruo if (!rc || !have_reloc_root(root)) 403949b25e05SJeff Mahoney return 0; 40403fd0a558SYan, Zheng 40413fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 40423fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated; 40433fd0a558SYan, Zheng 40443fd0a558SYan, Zheng if (rc->merge_reloc_tree) { 40453fd0a558SYan, Zheng ret = btrfs_block_rsv_migrate(&pending->block_rsv, 40463fd0a558SYan, Zheng rc->block_rsv, 40473a584174SLu Fengqi rc->nodes_relocated, true); 404849b25e05SJeff Mahoney if (ret) 404949b25e05SJeff Mahoney return ret; 40503fd0a558SYan, Zheng } 40513fd0a558SYan, Zheng 40523fd0a558SYan, Zheng new_root = pending->snap; 40533fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root->reloc_root, 40543fd0a558SYan, Zheng new_root->root_key.objectid); 405549b25e05SJeff Mahoney if (IS_ERR(reloc_root)) 405649b25e05SJeff Mahoney return PTR_ERR(reloc_root); 40573fd0a558SYan, Zheng 4058ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 4059ffd7b339SJeff Mahoney BUG_ON(ret < 0); 4060f44deb74SJosef Bacik new_root->reloc_root = btrfs_grab_root(reloc_root); 40613fd0a558SYan, Zheng 406249b25e05SJeff Mahoney if (rc->create_reloc_tree) 40633fd0a558SYan, Zheng ret = clone_backref_node(trans, rc, root, reloc_root); 406449b25e05SJeff Mahoney return ret; 40653fd0a558SYan, Zheng } 4066