15d4f98a2SYan Zheng /* 25d4f98a2SYan Zheng * Copyright (C) 2009 Oracle. All rights reserved. 35d4f98a2SYan Zheng * 45d4f98a2SYan Zheng * This program is free software; you can redistribute it and/or 55d4f98a2SYan Zheng * modify it under the terms of the GNU General Public 65d4f98a2SYan Zheng * License v2 as published by the Free Software Foundation. 75d4f98a2SYan Zheng * 85d4f98a2SYan Zheng * This program is distributed in the hope that it will be useful, 95d4f98a2SYan Zheng * but WITHOUT ANY WARRANTY; without even the implied warranty of 105d4f98a2SYan Zheng * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 115d4f98a2SYan Zheng * General Public License for more details. 125d4f98a2SYan Zheng * 135d4f98a2SYan Zheng * You should have received a copy of the GNU General Public 145d4f98a2SYan Zheng * License along with this program; if not, write to the 155d4f98a2SYan Zheng * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 165d4f98a2SYan Zheng * Boston, MA 021110-1307, USA. 175d4f98a2SYan Zheng */ 185d4f98a2SYan Zheng 195d4f98a2SYan Zheng #include <linux/sched.h> 205d4f98a2SYan Zheng #include <linux/pagemap.h> 215d4f98a2SYan Zheng #include <linux/writeback.h> 225d4f98a2SYan Zheng #include <linux/blkdev.h> 235d4f98a2SYan Zheng #include <linux/rbtree.h> 245a0e3ad6STejun Heo #include <linux/slab.h> 255d4f98a2SYan Zheng #include "ctree.h" 265d4f98a2SYan Zheng #include "disk-io.h" 275d4f98a2SYan Zheng #include "transaction.h" 285d4f98a2SYan Zheng #include "volumes.h" 295d4f98a2SYan Zheng #include "locking.h" 305d4f98a2SYan Zheng #include "btrfs_inode.h" 315d4f98a2SYan Zheng #include "async-thread.h" 320af3d00bSJosef Bacik #include "free-space-cache.h" 33581bb050SLi Zefan #include "inode-map.h" 345d4f98a2SYan Zheng 355d4f98a2SYan Zheng /* 365d4f98a2SYan Zheng * backref_node, mapping_node and tree_block start with this 375d4f98a2SYan Zheng */ 385d4f98a2SYan Zheng struct tree_entry { 395d4f98a2SYan Zheng struct rb_node rb_node; 405d4f98a2SYan Zheng u64 bytenr; 415d4f98a2SYan Zheng }; 425d4f98a2SYan Zheng 435d4f98a2SYan Zheng /* 445d4f98a2SYan Zheng * present a tree block in the backref cache 455d4f98a2SYan Zheng */ 465d4f98a2SYan Zheng struct backref_node { 475d4f98a2SYan Zheng struct rb_node rb_node; 485d4f98a2SYan Zheng u64 bytenr; 493fd0a558SYan, Zheng 503fd0a558SYan, Zheng u64 new_bytenr; 513fd0a558SYan, Zheng /* objectid of tree block owner, can be not uptodate */ 525d4f98a2SYan Zheng u64 owner; 533fd0a558SYan, Zheng /* link to pending, changed or detached list */ 543fd0a558SYan, Zheng struct list_head list; 555d4f98a2SYan Zheng /* list of upper level blocks reference this block */ 565d4f98a2SYan Zheng struct list_head upper; 575d4f98a2SYan Zheng /* list of child blocks in the cache */ 585d4f98a2SYan Zheng struct list_head lower; 595d4f98a2SYan Zheng /* NULL if this node is not tree root */ 605d4f98a2SYan Zheng struct btrfs_root *root; 615d4f98a2SYan Zheng /* extent buffer got by COW the block */ 625d4f98a2SYan Zheng struct extent_buffer *eb; 635d4f98a2SYan Zheng /* level of tree block */ 645d4f98a2SYan Zheng unsigned int level:8; 653fd0a558SYan, Zheng /* is the block in non-reference counted tree */ 663fd0a558SYan, Zheng unsigned int cowonly:1; 673fd0a558SYan, Zheng /* 1 if no child node in the cache */ 685d4f98a2SYan Zheng unsigned int lowest:1; 695d4f98a2SYan Zheng /* is the extent buffer locked */ 705d4f98a2SYan Zheng unsigned int locked:1; 715d4f98a2SYan Zheng /* has the block been processed */ 725d4f98a2SYan Zheng unsigned int processed:1; 735d4f98a2SYan Zheng /* have backrefs of this block been checked */ 745d4f98a2SYan Zheng unsigned int checked:1; 753fd0a558SYan, Zheng /* 763fd0a558SYan, Zheng * 1 if corresponding block has been cowed but some upper 773fd0a558SYan, Zheng * level block pointers may not point to the new location 783fd0a558SYan, Zheng */ 793fd0a558SYan, Zheng unsigned int pending:1; 803fd0a558SYan, Zheng /* 813fd0a558SYan, Zheng * 1 if the backref node isn't connected to any other 823fd0a558SYan, Zheng * backref node. 833fd0a558SYan, Zheng */ 843fd0a558SYan, Zheng unsigned int detached:1; 855d4f98a2SYan Zheng }; 865d4f98a2SYan Zheng 875d4f98a2SYan Zheng /* 885d4f98a2SYan Zheng * present a block pointer in the backref cache 895d4f98a2SYan Zheng */ 905d4f98a2SYan Zheng struct backref_edge { 915d4f98a2SYan Zheng struct list_head list[2]; 925d4f98a2SYan Zheng struct backref_node *node[2]; 935d4f98a2SYan Zheng }; 945d4f98a2SYan Zheng 955d4f98a2SYan Zheng #define LOWER 0 965d4f98a2SYan Zheng #define UPPER 1 975d4f98a2SYan Zheng 985d4f98a2SYan Zheng struct backref_cache { 995d4f98a2SYan Zheng /* red black tree of all backref nodes in the cache */ 1005d4f98a2SYan Zheng struct rb_root rb_root; 1013fd0a558SYan, Zheng /* for passing backref nodes to btrfs_reloc_cow_block */ 1023fd0a558SYan, Zheng struct backref_node *path[BTRFS_MAX_LEVEL]; 1033fd0a558SYan, Zheng /* 1043fd0a558SYan, Zheng * list of blocks that have been cowed but some block 1053fd0a558SYan, Zheng * pointers in upper level blocks may not reflect the 1063fd0a558SYan, Zheng * new location 1073fd0a558SYan, Zheng */ 1085d4f98a2SYan Zheng struct list_head pending[BTRFS_MAX_LEVEL]; 1093fd0a558SYan, Zheng /* list of backref nodes with no child node */ 1103fd0a558SYan, Zheng struct list_head leaves; 1113fd0a558SYan, Zheng /* list of blocks that have been cowed in current transaction */ 1123fd0a558SYan, Zheng struct list_head changed; 1133fd0a558SYan, Zheng /* list of detached backref node. */ 1143fd0a558SYan, Zheng struct list_head detached; 1153fd0a558SYan, Zheng 1163fd0a558SYan, Zheng u64 last_trans; 1173fd0a558SYan, Zheng 1183fd0a558SYan, Zheng int nr_nodes; 1193fd0a558SYan, Zheng int nr_edges; 1205d4f98a2SYan Zheng }; 1215d4f98a2SYan Zheng 1225d4f98a2SYan Zheng /* 1235d4f98a2SYan Zheng * map address of tree root to tree 1245d4f98a2SYan Zheng */ 1255d4f98a2SYan Zheng struct mapping_node { 1265d4f98a2SYan Zheng struct rb_node rb_node; 1275d4f98a2SYan Zheng u64 bytenr; 1285d4f98a2SYan Zheng void *data; 1295d4f98a2SYan Zheng }; 1305d4f98a2SYan Zheng 1315d4f98a2SYan Zheng struct mapping_tree { 1325d4f98a2SYan Zheng struct rb_root rb_root; 1335d4f98a2SYan Zheng spinlock_t lock; 1345d4f98a2SYan Zheng }; 1355d4f98a2SYan Zheng 1365d4f98a2SYan Zheng /* 1375d4f98a2SYan Zheng * present a tree block to process 1385d4f98a2SYan Zheng */ 1395d4f98a2SYan Zheng struct tree_block { 1405d4f98a2SYan Zheng struct rb_node rb_node; 1415d4f98a2SYan Zheng u64 bytenr; 1425d4f98a2SYan Zheng struct btrfs_key key; 1435d4f98a2SYan Zheng unsigned int level:8; 1445d4f98a2SYan Zheng unsigned int key_ready:1; 1455d4f98a2SYan Zheng }; 1465d4f98a2SYan Zheng 1470257bb82SYan, Zheng #define MAX_EXTENTS 128 1480257bb82SYan, Zheng 1490257bb82SYan, Zheng struct file_extent_cluster { 1500257bb82SYan, Zheng u64 start; 1510257bb82SYan, Zheng u64 end; 1520257bb82SYan, Zheng u64 boundary[MAX_EXTENTS]; 1530257bb82SYan, Zheng unsigned int nr; 1540257bb82SYan, Zheng }; 1550257bb82SYan, Zheng 1565d4f98a2SYan Zheng struct reloc_control { 1575d4f98a2SYan Zheng /* block group to relocate */ 1585d4f98a2SYan Zheng struct btrfs_block_group_cache *block_group; 1595d4f98a2SYan Zheng /* extent tree */ 1605d4f98a2SYan Zheng struct btrfs_root *extent_root; 1615d4f98a2SYan Zheng /* inode for moving data */ 1625d4f98a2SYan Zheng struct inode *data_inode; 1633fd0a558SYan, Zheng 1643fd0a558SYan, Zheng struct btrfs_block_rsv *block_rsv; 1653fd0a558SYan, Zheng 1663fd0a558SYan, Zheng struct backref_cache backref_cache; 1673fd0a558SYan, Zheng 1683fd0a558SYan, Zheng struct file_extent_cluster cluster; 1695d4f98a2SYan Zheng /* tree blocks have been processed */ 1705d4f98a2SYan Zheng struct extent_io_tree processed_blocks; 1715d4f98a2SYan Zheng /* map start of tree root to corresponding reloc tree */ 1725d4f98a2SYan Zheng struct mapping_tree reloc_root_tree; 1735d4f98a2SYan Zheng /* list of reloc trees */ 1745d4f98a2SYan Zheng struct list_head reloc_roots; 1753fd0a558SYan, Zheng /* size of metadata reservation for merging reloc trees */ 1763fd0a558SYan, Zheng u64 merging_rsv_size; 1773fd0a558SYan, Zheng /* size of relocated tree nodes */ 1783fd0a558SYan, Zheng u64 nodes_relocated; 1793fd0a558SYan, Zheng 1805d4f98a2SYan Zheng u64 search_start; 1815d4f98a2SYan Zheng u64 extents_found; 1823fd0a558SYan, Zheng 1833fd0a558SYan, Zheng unsigned int stage:8; 1843fd0a558SYan, Zheng unsigned int create_reloc_tree:1; 1853fd0a558SYan, Zheng unsigned int merge_reloc_tree:1; 1865d4f98a2SYan Zheng unsigned int found_file_extent:1; 1873fd0a558SYan, Zheng unsigned int commit_transaction:1; 1885d4f98a2SYan Zheng }; 1895d4f98a2SYan Zheng 1905d4f98a2SYan Zheng /* stages of data relocation */ 1915d4f98a2SYan Zheng #define MOVE_DATA_EXTENTS 0 1925d4f98a2SYan Zheng #define UPDATE_DATA_PTRS 1 1935d4f98a2SYan Zheng 1943fd0a558SYan, Zheng static void remove_backref_node(struct backref_cache *cache, 1953fd0a558SYan, Zheng struct backref_node *node); 1963fd0a558SYan, Zheng static void __mark_block_processed(struct reloc_control *rc, 1973fd0a558SYan, Zheng struct backref_node *node); 1985d4f98a2SYan Zheng 1995d4f98a2SYan Zheng static void mapping_tree_init(struct mapping_tree *tree) 2005d4f98a2SYan Zheng { 2016bef4d31SEric Paris tree->rb_root = RB_ROOT; 2025d4f98a2SYan Zheng spin_lock_init(&tree->lock); 2035d4f98a2SYan Zheng } 2045d4f98a2SYan Zheng 2055d4f98a2SYan Zheng static void backref_cache_init(struct backref_cache *cache) 2065d4f98a2SYan Zheng { 2075d4f98a2SYan Zheng int i; 2086bef4d31SEric Paris cache->rb_root = RB_ROOT; 2095d4f98a2SYan Zheng for (i = 0; i < BTRFS_MAX_LEVEL; i++) 2105d4f98a2SYan Zheng INIT_LIST_HEAD(&cache->pending[i]); 2113fd0a558SYan, Zheng INIT_LIST_HEAD(&cache->changed); 2123fd0a558SYan, Zheng INIT_LIST_HEAD(&cache->detached); 2133fd0a558SYan, Zheng INIT_LIST_HEAD(&cache->leaves); 2145d4f98a2SYan Zheng } 2155d4f98a2SYan Zheng 2163fd0a558SYan, Zheng static void backref_cache_cleanup(struct backref_cache *cache) 2175d4f98a2SYan Zheng { 2183fd0a558SYan, Zheng struct backref_node *node; 2193fd0a558SYan, Zheng int i; 2203fd0a558SYan, Zheng 2213fd0a558SYan, Zheng while (!list_empty(&cache->detached)) { 2223fd0a558SYan, Zheng node = list_entry(cache->detached.next, 2233fd0a558SYan, Zheng struct backref_node, list); 2243fd0a558SYan, Zheng remove_backref_node(cache, node); 2253fd0a558SYan, Zheng } 2263fd0a558SYan, Zheng 2273fd0a558SYan, Zheng while (!list_empty(&cache->leaves)) { 2283fd0a558SYan, Zheng node = list_entry(cache->leaves.next, 2293fd0a558SYan, Zheng struct backref_node, lower); 2303fd0a558SYan, Zheng remove_backref_node(cache, node); 2313fd0a558SYan, Zheng } 2323fd0a558SYan, Zheng 2333fd0a558SYan, Zheng cache->last_trans = 0; 2343fd0a558SYan, Zheng 2353fd0a558SYan, Zheng for (i = 0; i < BTRFS_MAX_LEVEL; i++) 2363fd0a558SYan, Zheng BUG_ON(!list_empty(&cache->pending[i])); 2373fd0a558SYan, Zheng BUG_ON(!list_empty(&cache->changed)); 2383fd0a558SYan, Zheng BUG_ON(!list_empty(&cache->detached)); 2393fd0a558SYan, Zheng BUG_ON(!RB_EMPTY_ROOT(&cache->rb_root)); 2403fd0a558SYan, Zheng BUG_ON(cache->nr_nodes); 2413fd0a558SYan, Zheng BUG_ON(cache->nr_edges); 2423fd0a558SYan, Zheng } 2433fd0a558SYan, Zheng 2443fd0a558SYan, Zheng static struct backref_node *alloc_backref_node(struct backref_cache *cache) 2453fd0a558SYan, Zheng { 2463fd0a558SYan, Zheng struct backref_node *node; 2473fd0a558SYan, Zheng 2483fd0a558SYan, Zheng node = kzalloc(sizeof(*node), GFP_NOFS); 2493fd0a558SYan, Zheng if (node) { 2503fd0a558SYan, Zheng INIT_LIST_HEAD(&node->list); 2515d4f98a2SYan Zheng INIT_LIST_HEAD(&node->upper); 2525d4f98a2SYan Zheng INIT_LIST_HEAD(&node->lower); 2535d4f98a2SYan Zheng RB_CLEAR_NODE(&node->rb_node); 2543fd0a558SYan, Zheng cache->nr_nodes++; 2553fd0a558SYan, Zheng } 2563fd0a558SYan, Zheng return node; 2573fd0a558SYan, Zheng } 2583fd0a558SYan, Zheng 2593fd0a558SYan, Zheng static void free_backref_node(struct backref_cache *cache, 2603fd0a558SYan, Zheng struct backref_node *node) 2613fd0a558SYan, Zheng { 2623fd0a558SYan, Zheng if (node) { 2633fd0a558SYan, Zheng cache->nr_nodes--; 2643fd0a558SYan, Zheng kfree(node); 2653fd0a558SYan, Zheng } 2663fd0a558SYan, Zheng } 2673fd0a558SYan, Zheng 2683fd0a558SYan, Zheng static struct backref_edge *alloc_backref_edge(struct backref_cache *cache) 2693fd0a558SYan, Zheng { 2703fd0a558SYan, Zheng struct backref_edge *edge; 2713fd0a558SYan, Zheng 2723fd0a558SYan, Zheng edge = kzalloc(sizeof(*edge), GFP_NOFS); 2733fd0a558SYan, Zheng if (edge) 2743fd0a558SYan, Zheng cache->nr_edges++; 2753fd0a558SYan, Zheng return edge; 2763fd0a558SYan, Zheng } 2773fd0a558SYan, Zheng 2783fd0a558SYan, Zheng static void free_backref_edge(struct backref_cache *cache, 2793fd0a558SYan, Zheng struct backref_edge *edge) 2803fd0a558SYan, Zheng { 2813fd0a558SYan, Zheng if (edge) { 2823fd0a558SYan, Zheng cache->nr_edges--; 2833fd0a558SYan, Zheng kfree(edge); 2843fd0a558SYan, Zheng } 2855d4f98a2SYan Zheng } 2865d4f98a2SYan Zheng 2875d4f98a2SYan Zheng static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, 2885d4f98a2SYan Zheng struct rb_node *node) 2895d4f98a2SYan Zheng { 2905d4f98a2SYan Zheng struct rb_node **p = &root->rb_node; 2915d4f98a2SYan Zheng struct rb_node *parent = NULL; 2925d4f98a2SYan Zheng struct tree_entry *entry; 2935d4f98a2SYan Zheng 2945d4f98a2SYan Zheng while (*p) { 2955d4f98a2SYan Zheng parent = *p; 2965d4f98a2SYan Zheng entry = rb_entry(parent, struct tree_entry, rb_node); 2975d4f98a2SYan Zheng 2985d4f98a2SYan Zheng if (bytenr < entry->bytenr) 2995d4f98a2SYan Zheng p = &(*p)->rb_left; 3005d4f98a2SYan Zheng else if (bytenr > entry->bytenr) 3015d4f98a2SYan Zheng p = &(*p)->rb_right; 3025d4f98a2SYan Zheng else 3035d4f98a2SYan Zheng return parent; 3045d4f98a2SYan Zheng } 3055d4f98a2SYan Zheng 3065d4f98a2SYan Zheng rb_link_node(node, parent, p); 3075d4f98a2SYan Zheng rb_insert_color(node, root); 3085d4f98a2SYan Zheng return NULL; 3095d4f98a2SYan Zheng } 3105d4f98a2SYan Zheng 3115d4f98a2SYan Zheng static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) 3125d4f98a2SYan Zheng { 3135d4f98a2SYan Zheng struct rb_node *n = root->rb_node; 3145d4f98a2SYan Zheng struct tree_entry *entry; 3155d4f98a2SYan Zheng 3165d4f98a2SYan Zheng while (n) { 3175d4f98a2SYan Zheng entry = rb_entry(n, struct tree_entry, rb_node); 3185d4f98a2SYan Zheng 3195d4f98a2SYan Zheng if (bytenr < entry->bytenr) 3205d4f98a2SYan Zheng n = n->rb_left; 3215d4f98a2SYan Zheng else if (bytenr > entry->bytenr) 3225d4f98a2SYan Zheng n = n->rb_right; 3235d4f98a2SYan Zheng else 3245d4f98a2SYan Zheng return n; 3255d4f98a2SYan Zheng } 3265d4f98a2SYan Zheng return NULL; 3275d4f98a2SYan Zheng } 3285d4f98a2SYan Zheng 32948a3b636SEric Sandeen static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr) 33043c04fb1SJeff Mahoney { 33143c04fb1SJeff Mahoney 33243c04fb1SJeff Mahoney struct btrfs_fs_info *fs_info = NULL; 33343c04fb1SJeff Mahoney struct backref_node *bnode = rb_entry(rb_node, struct backref_node, 33443c04fb1SJeff Mahoney rb_node); 33543c04fb1SJeff Mahoney if (bnode->root) 33643c04fb1SJeff Mahoney fs_info = bnode->root->fs_info; 33743c04fb1SJeff Mahoney btrfs_panic(fs_info, errno, "Inconsistency in backref cache " 33843c04fb1SJeff Mahoney "found at offset %llu\n", (unsigned long long)bytenr); 33943c04fb1SJeff Mahoney } 34043c04fb1SJeff Mahoney 3415d4f98a2SYan Zheng /* 3425d4f98a2SYan Zheng * walk up backref nodes until reach node presents tree root 3435d4f98a2SYan Zheng */ 3445d4f98a2SYan Zheng static struct backref_node *walk_up_backref(struct backref_node *node, 3455d4f98a2SYan Zheng struct backref_edge *edges[], 3465d4f98a2SYan Zheng int *index) 3475d4f98a2SYan Zheng { 3485d4f98a2SYan Zheng struct backref_edge *edge; 3495d4f98a2SYan Zheng int idx = *index; 3505d4f98a2SYan Zheng 3515d4f98a2SYan Zheng while (!list_empty(&node->upper)) { 3525d4f98a2SYan Zheng edge = list_entry(node->upper.next, 3535d4f98a2SYan Zheng struct backref_edge, list[LOWER]); 3545d4f98a2SYan Zheng edges[idx++] = edge; 3555d4f98a2SYan Zheng node = edge->node[UPPER]; 3565d4f98a2SYan Zheng } 3573fd0a558SYan, Zheng BUG_ON(node->detached); 3585d4f98a2SYan Zheng *index = idx; 3595d4f98a2SYan Zheng return node; 3605d4f98a2SYan Zheng } 3615d4f98a2SYan Zheng 3625d4f98a2SYan Zheng /* 3635d4f98a2SYan Zheng * walk down backref nodes to find start of next reference path 3645d4f98a2SYan Zheng */ 3655d4f98a2SYan Zheng static struct backref_node *walk_down_backref(struct backref_edge *edges[], 3665d4f98a2SYan Zheng int *index) 3675d4f98a2SYan Zheng { 3685d4f98a2SYan Zheng struct backref_edge *edge; 3695d4f98a2SYan Zheng struct backref_node *lower; 3705d4f98a2SYan Zheng int idx = *index; 3715d4f98a2SYan Zheng 3725d4f98a2SYan Zheng while (idx > 0) { 3735d4f98a2SYan Zheng edge = edges[idx - 1]; 3745d4f98a2SYan Zheng lower = edge->node[LOWER]; 3755d4f98a2SYan Zheng if (list_is_last(&edge->list[LOWER], &lower->upper)) { 3765d4f98a2SYan Zheng idx--; 3775d4f98a2SYan Zheng continue; 3785d4f98a2SYan Zheng } 3795d4f98a2SYan Zheng edge = list_entry(edge->list[LOWER].next, 3805d4f98a2SYan Zheng struct backref_edge, list[LOWER]); 3815d4f98a2SYan Zheng edges[idx - 1] = edge; 3825d4f98a2SYan Zheng *index = idx; 3835d4f98a2SYan Zheng return edge->node[UPPER]; 3845d4f98a2SYan Zheng } 3855d4f98a2SYan Zheng *index = 0; 3865d4f98a2SYan Zheng return NULL; 3875d4f98a2SYan Zheng } 3885d4f98a2SYan Zheng 3893fd0a558SYan, Zheng static void unlock_node_buffer(struct backref_node *node) 3905d4f98a2SYan Zheng { 3915d4f98a2SYan Zheng if (node->locked) { 3925d4f98a2SYan Zheng btrfs_tree_unlock(node->eb); 3935d4f98a2SYan Zheng node->locked = 0; 3945d4f98a2SYan Zheng } 3953fd0a558SYan, Zheng } 3963fd0a558SYan, Zheng 3973fd0a558SYan, Zheng static void drop_node_buffer(struct backref_node *node) 3983fd0a558SYan, Zheng { 3993fd0a558SYan, Zheng if (node->eb) { 4003fd0a558SYan, Zheng unlock_node_buffer(node); 4015d4f98a2SYan Zheng free_extent_buffer(node->eb); 4025d4f98a2SYan Zheng node->eb = NULL; 4035d4f98a2SYan Zheng } 4045d4f98a2SYan Zheng } 4055d4f98a2SYan Zheng 4065d4f98a2SYan Zheng static void drop_backref_node(struct backref_cache *tree, 4075d4f98a2SYan Zheng struct backref_node *node) 4085d4f98a2SYan Zheng { 4095d4f98a2SYan Zheng BUG_ON(!list_empty(&node->upper)); 4105d4f98a2SYan Zheng 4115d4f98a2SYan Zheng drop_node_buffer(node); 4123fd0a558SYan, Zheng list_del(&node->list); 4135d4f98a2SYan Zheng list_del(&node->lower); 4143fd0a558SYan, Zheng if (!RB_EMPTY_NODE(&node->rb_node)) 4155d4f98a2SYan Zheng rb_erase(&node->rb_node, &tree->rb_root); 4163fd0a558SYan, Zheng free_backref_node(tree, node); 4175d4f98a2SYan Zheng } 4185d4f98a2SYan Zheng 4195d4f98a2SYan Zheng /* 4205d4f98a2SYan Zheng * remove a backref node from the backref cache 4215d4f98a2SYan Zheng */ 4225d4f98a2SYan Zheng static void remove_backref_node(struct backref_cache *cache, 4235d4f98a2SYan Zheng struct backref_node *node) 4245d4f98a2SYan Zheng { 4255d4f98a2SYan Zheng struct backref_node *upper; 4265d4f98a2SYan Zheng struct backref_edge *edge; 4275d4f98a2SYan Zheng 4285d4f98a2SYan Zheng if (!node) 4295d4f98a2SYan Zheng return; 4305d4f98a2SYan Zheng 4313fd0a558SYan, Zheng BUG_ON(!node->lowest && !node->detached); 4325d4f98a2SYan Zheng while (!list_empty(&node->upper)) { 4335d4f98a2SYan Zheng edge = list_entry(node->upper.next, struct backref_edge, 4345d4f98a2SYan Zheng list[LOWER]); 4355d4f98a2SYan Zheng upper = edge->node[UPPER]; 4365d4f98a2SYan Zheng list_del(&edge->list[LOWER]); 4375d4f98a2SYan Zheng list_del(&edge->list[UPPER]); 4383fd0a558SYan, Zheng free_backref_edge(cache, edge); 4393fd0a558SYan, Zheng 4403fd0a558SYan, Zheng if (RB_EMPTY_NODE(&upper->rb_node)) { 4413fd0a558SYan, Zheng BUG_ON(!list_empty(&node->upper)); 4423fd0a558SYan, Zheng drop_backref_node(cache, node); 4433fd0a558SYan, Zheng node = upper; 4443fd0a558SYan, Zheng node->lowest = 1; 4453fd0a558SYan, Zheng continue; 4463fd0a558SYan, Zheng } 4475d4f98a2SYan Zheng /* 4483fd0a558SYan, Zheng * add the node to leaf node list if no other 4495d4f98a2SYan Zheng * child block cached. 4505d4f98a2SYan Zheng */ 4515d4f98a2SYan Zheng if (list_empty(&upper->lower)) { 4523fd0a558SYan, Zheng list_add_tail(&upper->lower, &cache->leaves); 4535d4f98a2SYan Zheng upper->lowest = 1; 4545d4f98a2SYan Zheng } 4555d4f98a2SYan Zheng } 4563fd0a558SYan, Zheng 4575d4f98a2SYan Zheng drop_backref_node(cache, node); 4585d4f98a2SYan Zheng } 4595d4f98a2SYan Zheng 4603fd0a558SYan, Zheng static void update_backref_node(struct backref_cache *cache, 4613fd0a558SYan, Zheng struct backref_node *node, u64 bytenr) 4623fd0a558SYan, Zheng { 4633fd0a558SYan, Zheng struct rb_node *rb_node; 4643fd0a558SYan, Zheng rb_erase(&node->rb_node, &cache->rb_root); 4653fd0a558SYan, Zheng node->bytenr = bytenr; 4663fd0a558SYan, Zheng rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node); 46743c04fb1SJeff Mahoney if (rb_node) 46843c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, bytenr); 4693fd0a558SYan, Zheng } 4703fd0a558SYan, Zheng 4713fd0a558SYan, Zheng /* 4723fd0a558SYan, Zheng * update backref cache after a transaction commit 4733fd0a558SYan, Zheng */ 4743fd0a558SYan, Zheng static int update_backref_cache(struct btrfs_trans_handle *trans, 4753fd0a558SYan, Zheng struct backref_cache *cache) 4763fd0a558SYan, Zheng { 4773fd0a558SYan, Zheng struct backref_node *node; 4783fd0a558SYan, Zheng int level = 0; 4793fd0a558SYan, Zheng 4803fd0a558SYan, Zheng if (cache->last_trans == 0) { 4813fd0a558SYan, Zheng cache->last_trans = trans->transid; 4823fd0a558SYan, Zheng return 0; 4833fd0a558SYan, Zheng } 4843fd0a558SYan, Zheng 4853fd0a558SYan, Zheng if (cache->last_trans == trans->transid) 4863fd0a558SYan, Zheng return 0; 4873fd0a558SYan, Zheng 4883fd0a558SYan, Zheng /* 4893fd0a558SYan, Zheng * detached nodes are used to avoid unnecessary backref 4903fd0a558SYan, Zheng * lookup. transaction commit changes the extent tree. 4913fd0a558SYan, Zheng * so the detached nodes are no longer useful. 4923fd0a558SYan, Zheng */ 4933fd0a558SYan, Zheng while (!list_empty(&cache->detached)) { 4943fd0a558SYan, Zheng node = list_entry(cache->detached.next, 4953fd0a558SYan, Zheng struct backref_node, list); 4963fd0a558SYan, Zheng remove_backref_node(cache, node); 4973fd0a558SYan, Zheng } 4983fd0a558SYan, Zheng 4993fd0a558SYan, Zheng while (!list_empty(&cache->changed)) { 5003fd0a558SYan, Zheng node = list_entry(cache->changed.next, 5013fd0a558SYan, Zheng struct backref_node, list); 5023fd0a558SYan, Zheng list_del_init(&node->list); 5033fd0a558SYan, Zheng BUG_ON(node->pending); 5043fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 5053fd0a558SYan, Zheng } 5063fd0a558SYan, Zheng 5073fd0a558SYan, Zheng /* 5083fd0a558SYan, Zheng * some nodes can be left in the pending list if there were 5093fd0a558SYan, Zheng * errors during processing the pending nodes. 5103fd0a558SYan, Zheng */ 5113fd0a558SYan, Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 5123fd0a558SYan, Zheng list_for_each_entry(node, &cache->pending[level], list) { 5133fd0a558SYan, Zheng BUG_ON(!node->pending); 5143fd0a558SYan, Zheng if (node->bytenr == node->new_bytenr) 5153fd0a558SYan, Zheng continue; 5163fd0a558SYan, Zheng update_backref_node(cache, node, node->new_bytenr); 5173fd0a558SYan, Zheng } 5183fd0a558SYan, Zheng } 5193fd0a558SYan, Zheng 5203fd0a558SYan, Zheng cache->last_trans = 0; 5213fd0a558SYan, Zheng return 1; 5223fd0a558SYan, Zheng } 5233fd0a558SYan, Zheng 524f2a97a9dSDavid Sterba 5253fd0a558SYan, Zheng static int should_ignore_root(struct btrfs_root *root) 5263fd0a558SYan, Zheng { 5273fd0a558SYan, Zheng struct btrfs_root *reloc_root; 5283fd0a558SYan, Zheng 5293fd0a558SYan, Zheng if (!root->ref_cows) 5303fd0a558SYan, Zheng return 0; 5313fd0a558SYan, Zheng 5323fd0a558SYan, Zheng reloc_root = root->reloc_root; 5333fd0a558SYan, Zheng if (!reloc_root) 5343fd0a558SYan, Zheng return 0; 5353fd0a558SYan, Zheng 5363fd0a558SYan, Zheng if (btrfs_root_last_snapshot(&reloc_root->root_item) == 5373fd0a558SYan, Zheng root->fs_info->running_transaction->transid - 1) 5383fd0a558SYan, Zheng return 0; 5393fd0a558SYan, Zheng /* 5403fd0a558SYan, Zheng * if there is reloc tree and it was created in previous 5413fd0a558SYan, Zheng * transaction backref lookup can find the reloc tree, 5423fd0a558SYan, Zheng * so backref node for the fs tree root is useless for 5433fd0a558SYan, Zheng * relocation. 5443fd0a558SYan, Zheng */ 5453fd0a558SYan, Zheng return 1; 5463fd0a558SYan, Zheng } 5475d4f98a2SYan Zheng /* 5485d4f98a2SYan Zheng * find reloc tree by address of tree root 5495d4f98a2SYan Zheng */ 5505d4f98a2SYan Zheng static struct btrfs_root *find_reloc_root(struct reloc_control *rc, 5515d4f98a2SYan Zheng u64 bytenr) 5525d4f98a2SYan Zheng { 5535d4f98a2SYan Zheng struct rb_node *rb_node; 5545d4f98a2SYan Zheng struct mapping_node *node; 5555d4f98a2SYan Zheng struct btrfs_root *root = NULL; 5565d4f98a2SYan Zheng 5575d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 5585d4f98a2SYan Zheng rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr); 5595d4f98a2SYan Zheng if (rb_node) { 5605d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 5615d4f98a2SYan Zheng root = (struct btrfs_root *)node->data; 5625d4f98a2SYan Zheng } 5635d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 5645d4f98a2SYan Zheng return root; 5655d4f98a2SYan Zheng } 5665d4f98a2SYan Zheng 5675d4f98a2SYan Zheng static int is_cowonly_root(u64 root_objectid) 5685d4f98a2SYan Zheng { 5695d4f98a2SYan Zheng if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || 5705d4f98a2SYan Zheng root_objectid == BTRFS_EXTENT_TREE_OBJECTID || 5715d4f98a2SYan Zheng root_objectid == BTRFS_CHUNK_TREE_OBJECTID || 5725d4f98a2SYan Zheng root_objectid == BTRFS_DEV_TREE_OBJECTID || 5735d4f98a2SYan Zheng root_objectid == BTRFS_TREE_LOG_OBJECTID || 5745d4f98a2SYan Zheng root_objectid == BTRFS_CSUM_TREE_OBJECTID) 5755d4f98a2SYan Zheng return 1; 5765d4f98a2SYan Zheng return 0; 5775d4f98a2SYan Zheng } 5785d4f98a2SYan Zheng 5795d4f98a2SYan Zheng static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, 5805d4f98a2SYan Zheng u64 root_objectid) 5815d4f98a2SYan Zheng { 5825d4f98a2SYan Zheng struct btrfs_key key; 5835d4f98a2SYan Zheng 5845d4f98a2SYan Zheng key.objectid = root_objectid; 5855d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 5865d4f98a2SYan Zheng if (is_cowonly_root(root_objectid)) 5875d4f98a2SYan Zheng key.offset = 0; 5885d4f98a2SYan Zheng else 5895d4f98a2SYan Zheng key.offset = (u64)-1; 5905d4f98a2SYan Zheng 5915d4f98a2SYan Zheng return btrfs_read_fs_root_no_name(fs_info, &key); 5925d4f98a2SYan Zheng } 5935d4f98a2SYan Zheng 5945d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 5955d4f98a2SYan Zheng static noinline_for_stack 5965d4f98a2SYan Zheng struct btrfs_root *find_tree_root(struct reloc_control *rc, 5975d4f98a2SYan Zheng struct extent_buffer *leaf, 5985d4f98a2SYan Zheng struct btrfs_extent_ref_v0 *ref0) 5995d4f98a2SYan Zheng { 6005d4f98a2SYan Zheng struct btrfs_root *root; 6015d4f98a2SYan Zheng u64 root_objectid = btrfs_ref_root_v0(leaf, ref0); 6025d4f98a2SYan Zheng u64 generation = btrfs_ref_generation_v0(leaf, ref0); 6035d4f98a2SYan Zheng 6045d4f98a2SYan Zheng BUG_ON(root_objectid == BTRFS_TREE_RELOC_OBJECTID); 6055d4f98a2SYan Zheng 6065d4f98a2SYan Zheng root = read_fs_root(rc->extent_root->fs_info, root_objectid); 6075d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 6085d4f98a2SYan Zheng 6095d4f98a2SYan Zheng if (root->ref_cows && 6105d4f98a2SYan Zheng generation != btrfs_root_generation(&root->root_item)) 6115d4f98a2SYan Zheng return NULL; 6125d4f98a2SYan Zheng 6135d4f98a2SYan Zheng return root; 6145d4f98a2SYan Zheng } 6155d4f98a2SYan Zheng #endif 6165d4f98a2SYan Zheng 6175d4f98a2SYan Zheng static noinline_for_stack 6185d4f98a2SYan Zheng int find_inline_backref(struct extent_buffer *leaf, int slot, 6195d4f98a2SYan Zheng unsigned long *ptr, unsigned long *end) 6205d4f98a2SYan Zheng { 6213173a18fSJosef Bacik struct btrfs_key key; 6225d4f98a2SYan Zheng struct btrfs_extent_item *ei; 6235d4f98a2SYan Zheng struct btrfs_tree_block_info *bi; 6245d4f98a2SYan Zheng u32 item_size; 6255d4f98a2SYan Zheng 6263173a18fSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, slot); 6273173a18fSJosef Bacik 6285d4f98a2SYan Zheng item_size = btrfs_item_size_nr(leaf, slot); 6295d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 6305d4f98a2SYan Zheng if (item_size < sizeof(*ei)) { 6315d4f98a2SYan Zheng WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); 6325d4f98a2SYan Zheng return 1; 6335d4f98a2SYan Zheng } 6345d4f98a2SYan Zheng #endif 6355d4f98a2SYan Zheng ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); 6365d4f98a2SYan Zheng WARN_ON(!(btrfs_extent_flags(leaf, ei) & 6375d4f98a2SYan Zheng BTRFS_EXTENT_FLAG_TREE_BLOCK)); 6385d4f98a2SYan Zheng 6393173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY && 6403173a18fSJosef Bacik item_size <= sizeof(*ei) + sizeof(*bi)) { 6415d4f98a2SYan Zheng WARN_ON(item_size < sizeof(*ei) + sizeof(*bi)); 6425d4f98a2SYan Zheng return 1; 6435d4f98a2SYan Zheng } 6445d4f98a2SYan Zheng 6453173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY) { 6465d4f98a2SYan Zheng bi = (struct btrfs_tree_block_info *)(ei + 1); 6475d4f98a2SYan Zheng *ptr = (unsigned long)(bi + 1); 6483173a18fSJosef Bacik } else { 6493173a18fSJosef Bacik *ptr = (unsigned long)(ei + 1); 6503173a18fSJosef Bacik } 6515d4f98a2SYan Zheng *end = (unsigned long)ei + item_size; 6525d4f98a2SYan Zheng return 0; 6535d4f98a2SYan Zheng } 6545d4f98a2SYan Zheng 6555d4f98a2SYan Zheng /* 6565d4f98a2SYan Zheng * build backref tree for a given tree block. root of the backref tree 6575d4f98a2SYan Zheng * corresponds the tree block, leaves of the backref tree correspond 6585d4f98a2SYan Zheng * roots of b-trees that reference the tree block. 6595d4f98a2SYan Zheng * 6605d4f98a2SYan Zheng * the basic idea of this function is check backrefs of a given block 6615d4f98a2SYan Zheng * to find upper level blocks that refernece the block, and then check 6625d4f98a2SYan Zheng * bakcrefs of these upper level blocks recursively. the recursion stop 6635d4f98a2SYan Zheng * when tree root is reached or backrefs for the block is cached. 6645d4f98a2SYan Zheng * 6655d4f98a2SYan Zheng * NOTE: if we find backrefs for a block are cached, we know backrefs 6665d4f98a2SYan Zheng * for all upper level blocks that directly/indirectly reference the 6675d4f98a2SYan Zheng * block are also cached. 6685d4f98a2SYan Zheng */ 6693fd0a558SYan, Zheng static noinline_for_stack 6703fd0a558SYan, Zheng struct backref_node *build_backref_tree(struct reloc_control *rc, 6715d4f98a2SYan Zheng struct btrfs_key *node_key, 6725d4f98a2SYan Zheng int level, u64 bytenr) 6735d4f98a2SYan Zheng { 6743fd0a558SYan, Zheng struct backref_cache *cache = &rc->backref_cache; 6755d4f98a2SYan Zheng struct btrfs_path *path1; 6765d4f98a2SYan Zheng struct btrfs_path *path2; 6775d4f98a2SYan Zheng struct extent_buffer *eb; 6785d4f98a2SYan Zheng struct btrfs_root *root; 6795d4f98a2SYan Zheng struct backref_node *cur; 6805d4f98a2SYan Zheng struct backref_node *upper; 6815d4f98a2SYan Zheng struct backref_node *lower; 6825d4f98a2SYan Zheng struct backref_node *node = NULL; 6835d4f98a2SYan Zheng struct backref_node *exist = NULL; 6845d4f98a2SYan Zheng struct backref_edge *edge; 6855d4f98a2SYan Zheng struct rb_node *rb_node; 6865d4f98a2SYan Zheng struct btrfs_key key; 6875d4f98a2SYan Zheng unsigned long end; 6885d4f98a2SYan Zheng unsigned long ptr; 6895d4f98a2SYan Zheng LIST_HEAD(list); 6903fd0a558SYan, Zheng LIST_HEAD(useless); 6913fd0a558SYan, Zheng int cowonly; 6925d4f98a2SYan Zheng int ret; 6935d4f98a2SYan Zheng int err = 0; 6945d4f98a2SYan Zheng 6955d4f98a2SYan Zheng path1 = btrfs_alloc_path(); 6965d4f98a2SYan Zheng path2 = btrfs_alloc_path(); 6975d4f98a2SYan Zheng if (!path1 || !path2) { 6985d4f98a2SYan Zheng err = -ENOMEM; 6995d4f98a2SYan Zheng goto out; 7005d4f98a2SYan Zheng } 701026fd317SJosef Bacik path1->reada = 1; 702026fd317SJosef Bacik path2->reada = 2; 7035d4f98a2SYan Zheng 7043fd0a558SYan, Zheng node = alloc_backref_node(cache); 7055d4f98a2SYan Zheng if (!node) { 7065d4f98a2SYan Zheng err = -ENOMEM; 7075d4f98a2SYan Zheng goto out; 7085d4f98a2SYan Zheng } 7095d4f98a2SYan Zheng 7105d4f98a2SYan Zheng node->bytenr = bytenr; 7115d4f98a2SYan Zheng node->level = level; 7125d4f98a2SYan Zheng node->lowest = 1; 7135d4f98a2SYan Zheng cur = node; 7145d4f98a2SYan Zheng again: 7155d4f98a2SYan Zheng end = 0; 7165d4f98a2SYan Zheng ptr = 0; 7175d4f98a2SYan Zheng key.objectid = cur->bytenr; 7183173a18fSJosef Bacik key.type = BTRFS_METADATA_ITEM_KEY; 7195d4f98a2SYan Zheng key.offset = (u64)-1; 7205d4f98a2SYan Zheng 7215d4f98a2SYan Zheng path1->search_commit_root = 1; 7225d4f98a2SYan Zheng path1->skip_locking = 1; 7235d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1, 7245d4f98a2SYan Zheng 0, 0); 7255d4f98a2SYan Zheng if (ret < 0) { 7265d4f98a2SYan Zheng err = ret; 7275d4f98a2SYan Zheng goto out; 7285d4f98a2SYan Zheng } 7295d4f98a2SYan Zheng BUG_ON(!ret || !path1->slots[0]); 7305d4f98a2SYan Zheng 7315d4f98a2SYan Zheng path1->slots[0]--; 7325d4f98a2SYan Zheng 7335d4f98a2SYan Zheng WARN_ON(cur->checked); 7345d4f98a2SYan Zheng if (!list_empty(&cur->upper)) { 7355d4f98a2SYan Zheng /* 73670f23fd6SJustin P. Mattock * the backref was added previously when processing 7375d4f98a2SYan Zheng * backref of type BTRFS_TREE_BLOCK_REF_KEY 7385d4f98a2SYan Zheng */ 7395d4f98a2SYan Zheng BUG_ON(!list_is_singular(&cur->upper)); 7405d4f98a2SYan Zheng edge = list_entry(cur->upper.next, struct backref_edge, 7415d4f98a2SYan Zheng list[LOWER]); 7425d4f98a2SYan Zheng BUG_ON(!list_empty(&edge->list[UPPER])); 7435d4f98a2SYan Zheng exist = edge->node[UPPER]; 7445d4f98a2SYan Zheng /* 7455d4f98a2SYan Zheng * add the upper level block to pending list if we need 7465d4f98a2SYan Zheng * check its backrefs 7475d4f98a2SYan Zheng */ 7485d4f98a2SYan Zheng if (!exist->checked) 7495d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &list); 7505d4f98a2SYan Zheng } else { 7515d4f98a2SYan Zheng exist = NULL; 7525d4f98a2SYan Zheng } 7535d4f98a2SYan Zheng 7545d4f98a2SYan Zheng while (1) { 7555d4f98a2SYan Zheng cond_resched(); 7565d4f98a2SYan Zheng eb = path1->nodes[0]; 7575d4f98a2SYan Zheng 7585d4f98a2SYan Zheng if (ptr >= end) { 7595d4f98a2SYan Zheng if (path1->slots[0] >= btrfs_header_nritems(eb)) { 7605d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path1); 7615d4f98a2SYan Zheng if (ret < 0) { 7625d4f98a2SYan Zheng err = ret; 7635d4f98a2SYan Zheng goto out; 7645d4f98a2SYan Zheng } 7655d4f98a2SYan Zheng if (ret > 0) 7665d4f98a2SYan Zheng break; 7675d4f98a2SYan Zheng eb = path1->nodes[0]; 7685d4f98a2SYan Zheng } 7695d4f98a2SYan Zheng 7705d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &key, path1->slots[0]); 7715d4f98a2SYan Zheng if (key.objectid != cur->bytenr) { 7725d4f98a2SYan Zheng WARN_ON(exist); 7735d4f98a2SYan Zheng break; 7745d4f98a2SYan Zheng } 7755d4f98a2SYan Zheng 7763173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY || 7773173a18fSJosef Bacik key.type == BTRFS_METADATA_ITEM_KEY) { 7785d4f98a2SYan Zheng ret = find_inline_backref(eb, path1->slots[0], 7795d4f98a2SYan Zheng &ptr, &end); 7805d4f98a2SYan Zheng if (ret) 7815d4f98a2SYan Zheng goto next; 7825d4f98a2SYan Zheng } 7835d4f98a2SYan Zheng } 7845d4f98a2SYan Zheng 7855d4f98a2SYan Zheng if (ptr < end) { 7865d4f98a2SYan Zheng /* update key for inline back ref */ 7875d4f98a2SYan Zheng struct btrfs_extent_inline_ref *iref; 7885d4f98a2SYan Zheng iref = (struct btrfs_extent_inline_ref *)ptr; 7895d4f98a2SYan Zheng key.type = btrfs_extent_inline_ref_type(eb, iref); 7905d4f98a2SYan Zheng key.offset = btrfs_extent_inline_ref_offset(eb, iref); 7915d4f98a2SYan Zheng WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY && 7925d4f98a2SYan Zheng key.type != BTRFS_SHARED_BLOCK_REF_KEY); 7935d4f98a2SYan Zheng } 7945d4f98a2SYan Zheng 7955d4f98a2SYan Zheng if (exist && 7965d4f98a2SYan Zheng ((key.type == BTRFS_TREE_BLOCK_REF_KEY && 7975d4f98a2SYan Zheng exist->owner == key.offset) || 7985d4f98a2SYan Zheng (key.type == BTRFS_SHARED_BLOCK_REF_KEY && 7995d4f98a2SYan Zheng exist->bytenr == key.offset))) { 8005d4f98a2SYan Zheng exist = NULL; 8015d4f98a2SYan Zheng goto next; 8025d4f98a2SYan Zheng } 8035d4f98a2SYan Zheng 8045d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 8055d4f98a2SYan Zheng if (key.type == BTRFS_SHARED_BLOCK_REF_KEY || 8065d4f98a2SYan Zheng key.type == BTRFS_EXTENT_REF_V0_KEY) { 8073fd0a558SYan, Zheng if (key.type == BTRFS_EXTENT_REF_V0_KEY) { 8085d4f98a2SYan Zheng struct btrfs_extent_ref_v0 *ref0; 8095d4f98a2SYan Zheng ref0 = btrfs_item_ptr(eb, path1->slots[0], 8105d4f98a2SYan Zheng struct btrfs_extent_ref_v0); 8113fd0a558SYan, Zheng if (key.objectid == key.offset) { 812046f264fSYan, Zheng root = find_tree_root(rc, eb, ref0); 8133fd0a558SYan, Zheng if (root && !should_ignore_root(root)) 8145d4f98a2SYan Zheng cur->root = root; 8155d4f98a2SYan Zheng else 8163fd0a558SYan, Zheng list_add(&cur->list, &useless); 8175d4f98a2SYan Zheng break; 8185d4f98a2SYan Zheng } 819046f264fSYan, Zheng if (is_cowonly_root(btrfs_ref_root_v0(eb, 820046f264fSYan, Zheng ref0))) 821046f264fSYan, Zheng cur->cowonly = 1; 8223fd0a558SYan, Zheng } 8235d4f98a2SYan Zheng #else 8245d4f98a2SYan Zheng BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); 8255d4f98a2SYan Zheng if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { 8265d4f98a2SYan Zheng #endif 8275d4f98a2SYan Zheng if (key.objectid == key.offset) { 8285d4f98a2SYan Zheng /* 8295d4f98a2SYan Zheng * only root blocks of reloc trees use 8305d4f98a2SYan Zheng * backref of this type. 8315d4f98a2SYan Zheng */ 8325d4f98a2SYan Zheng root = find_reloc_root(rc, cur->bytenr); 8335d4f98a2SYan Zheng BUG_ON(!root); 8345d4f98a2SYan Zheng cur->root = root; 8355d4f98a2SYan Zheng break; 8365d4f98a2SYan Zheng } 8375d4f98a2SYan Zheng 8383fd0a558SYan, Zheng edge = alloc_backref_edge(cache); 8395d4f98a2SYan Zheng if (!edge) { 8405d4f98a2SYan Zheng err = -ENOMEM; 8415d4f98a2SYan Zheng goto out; 8425d4f98a2SYan Zheng } 8435d4f98a2SYan Zheng rb_node = tree_search(&cache->rb_root, key.offset); 8445d4f98a2SYan Zheng if (!rb_node) { 8453fd0a558SYan, Zheng upper = alloc_backref_node(cache); 8465d4f98a2SYan Zheng if (!upper) { 8473fd0a558SYan, Zheng free_backref_edge(cache, edge); 8485d4f98a2SYan Zheng err = -ENOMEM; 8495d4f98a2SYan Zheng goto out; 8505d4f98a2SYan Zheng } 8515d4f98a2SYan Zheng upper->bytenr = key.offset; 8525d4f98a2SYan Zheng upper->level = cur->level + 1; 8535d4f98a2SYan Zheng /* 8545d4f98a2SYan Zheng * backrefs for the upper level block isn't 8555d4f98a2SYan Zheng * cached, add the block to pending list 8565d4f98a2SYan Zheng */ 8575d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &list); 8585d4f98a2SYan Zheng } else { 8595d4f98a2SYan Zheng upper = rb_entry(rb_node, struct backref_node, 8605d4f98a2SYan Zheng rb_node); 8613fd0a558SYan, Zheng BUG_ON(!upper->checked); 8625d4f98a2SYan Zheng INIT_LIST_HEAD(&edge->list[UPPER]); 8635d4f98a2SYan Zheng } 8643fd0a558SYan, Zheng list_add_tail(&edge->list[LOWER], &cur->upper); 8655d4f98a2SYan Zheng edge->node[LOWER] = cur; 8663fd0a558SYan, Zheng edge->node[UPPER] = upper; 8675d4f98a2SYan Zheng 8685d4f98a2SYan Zheng goto next; 8695d4f98a2SYan Zheng } else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) { 8705d4f98a2SYan Zheng goto next; 8715d4f98a2SYan Zheng } 8725d4f98a2SYan Zheng 8735d4f98a2SYan Zheng /* key.type == BTRFS_TREE_BLOCK_REF_KEY */ 8745d4f98a2SYan Zheng root = read_fs_root(rc->extent_root->fs_info, key.offset); 8755d4f98a2SYan Zheng if (IS_ERR(root)) { 8765d4f98a2SYan Zheng err = PTR_ERR(root); 8775d4f98a2SYan Zheng goto out; 8785d4f98a2SYan Zheng } 8795d4f98a2SYan Zheng 8803fd0a558SYan, Zheng if (!root->ref_cows) 8813fd0a558SYan, Zheng cur->cowonly = 1; 8823fd0a558SYan, Zheng 8835d4f98a2SYan Zheng if (btrfs_root_level(&root->root_item) == cur->level) { 8845d4f98a2SYan Zheng /* tree root */ 8855d4f98a2SYan Zheng BUG_ON(btrfs_root_bytenr(&root->root_item) != 8865d4f98a2SYan Zheng cur->bytenr); 8873fd0a558SYan, Zheng if (should_ignore_root(root)) 8883fd0a558SYan, Zheng list_add(&cur->list, &useless); 8893fd0a558SYan, Zheng else 8905d4f98a2SYan Zheng cur->root = root; 8915d4f98a2SYan Zheng break; 8925d4f98a2SYan Zheng } 8935d4f98a2SYan Zheng 8945d4f98a2SYan Zheng level = cur->level + 1; 8955d4f98a2SYan Zheng 8965d4f98a2SYan Zheng /* 8975d4f98a2SYan Zheng * searching the tree to find upper level blocks 8985d4f98a2SYan Zheng * reference the block. 8995d4f98a2SYan Zheng */ 9005d4f98a2SYan Zheng path2->search_commit_root = 1; 9015d4f98a2SYan Zheng path2->skip_locking = 1; 9025d4f98a2SYan Zheng path2->lowest_level = level; 9035d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0); 9045d4f98a2SYan Zheng path2->lowest_level = 0; 9055d4f98a2SYan Zheng if (ret < 0) { 9065d4f98a2SYan Zheng err = ret; 9075d4f98a2SYan Zheng goto out; 9085d4f98a2SYan Zheng } 90933c66f43SYan Zheng if (ret > 0 && path2->slots[level] > 0) 91033c66f43SYan Zheng path2->slots[level]--; 9115d4f98a2SYan Zheng 9125d4f98a2SYan Zheng eb = path2->nodes[level]; 9135d4f98a2SYan Zheng WARN_ON(btrfs_node_blockptr(eb, path2->slots[level]) != 9145d4f98a2SYan Zheng cur->bytenr); 9155d4f98a2SYan Zheng 9165d4f98a2SYan Zheng lower = cur; 9175d4f98a2SYan Zheng for (; level < BTRFS_MAX_LEVEL; level++) { 9185d4f98a2SYan Zheng if (!path2->nodes[level]) { 9195d4f98a2SYan Zheng BUG_ON(btrfs_root_bytenr(&root->root_item) != 9205d4f98a2SYan Zheng lower->bytenr); 9213fd0a558SYan, Zheng if (should_ignore_root(root)) 9223fd0a558SYan, Zheng list_add(&lower->list, &useless); 9233fd0a558SYan, Zheng else 9245d4f98a2SYan Zheng lower->root = root; 9255d4f98a2SYan Zheng break; 9265d4f98a2SYan Zheng } 9275d4f98a2SYan Zheng 9283fd0a558SYan, Zheng edge = alloc_backref_edge(cache); 9295d4f98a2SYan Zheng if (!edge) { 9305d4f98a2SYan Zheng err = -ENOMEM; 9315d4f98a2SYan Zheng goto out; 9325d4f98a2SYan Zheng } 9335d4f98a2SYan Zheng 9345d4f98a2SYan Zheng eb = path2->nodes[level]; 9355d4f98a2SYan Zheng rb_node = tree_search(&cache->rb_root, eb->start); 9365d4f98a2SYan Zheng if (!rb_node) { 9373fd0a558SYan, Zheng upper = alloc_backref_node(cache); 9385d4f98a2SYan Zheng if (!upper) { 9393fd0a558SYan, Zheng free_backref_edge(cache, edge); 9405d4f98a2SYan Zheng err = -ENOMEM; 9415d4f98a2SYan Zheng goto out; 9425d4f98a2SYan Zheng } 9435d4f98a2SYan Zheng upper->bytenr = eb->start; 9445d4f98a2SYan Zheng upper->owner = btrfs_header_owner(eb); 9455d4f98a2SYan Zheng upper->level = lower->level + 1; 9463fd0a558SYan, Zheng if (!root->ref_cows) 9473fd0a558SYan, Zheng upper->cowonly = 1; 9485d4f98a2SYan Zheng 9495d4f98a2SYan Zheng /* 9505d4f98a2SYan Zheng * if we know the block isn't shared 9515d4f98a2SYan Zheng * we can void checking its backrefs. 9525d4f98a2SYan Zheng */ 9535d4f98a2SYan Zheng if (btrfs_block_can_be_shared(root, eb)) 9545d4f98a2SYan Zheng upper->checked = 0; 9555d4f98a2SYan Zheng else 9565d4f98a2SYan Zheng upper->checked = 1; 9575d4f98a2SYan Zheng 9585d4f98a2SYan Zheng /* 9595d4f98a2SYan Zheng * add the block to pending list if we 9605d4f98a2SYan Zheng * need check its backrefs. only block 9615d4f98a2SYan Zheng * at 'cur->level + 1' is added to the 9625d4f98a2SYan Zheng * tail of pending list. this guarantees 9635d4f98a2SYan Zheng * we check backrefs from lower level 9645d4f98a2SYan Zheng * blocks to upper level blocks. 9655d4f98a2SYan Zheng */ 9665d4f98a2SYan Zheng if (!upper->checked && 9675d4f98a2SYan Zheng level == cur->level + 1) { 9685d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], 9695d4f98a2SYan Zheng &list); 9705d4f98a2SYan Zheng } else 9715d4f98a2SYan Zheng INIT_LIST_HEAD(&edge->list[UPPER]); 9725d4f98a2SYan Zheng } else { 9735d4f98a2SYan Zheng upper = rb_entry(rb_node, struct backref_node, 9745d4f98a2SYan Zheng rb_node); 9755d4f98a2SYan Zheng BUG_ON(!upper->checked); 9765d4f98a2SYan Zheng INIT_LIST_HEAD(&edge->list[UPPER]); 9773fd0a558SYan, Zheng if (!upper->owner) 9783fd0a558SYan, Zheng upper->owner = btrfs_header_owner(eb); 9795d4f98a2SYan Zheng } 9805d4f98a2SYan Zheng list_add_tail(&edge->list[LOWER], &lower->upper); 9815d4f98a2SYan Zheng edge->node[LOWER] = lower; 9823fd0a558SYan, Zheng edge->node[UPPER] = upper; 9835d4f98a2SYan Zheng 9845d4f98a2SYan Zheng if (rb_node) 9855d4f98a2SYan Zheng break; 9865d4f98a2SYan Zheng lower = upper; 9875d4f98a2SYan Zheng upper = NULL; 9885d4f98a2SYan Zheng } 989b3b4aa74SDavid Sterba btrfs_release_path(path2); 9905d4f98a2SYan Zheng next: 9915d4f98a2SYan Zheng if (ptr < end) { 9925d4f98a2SYan Zheng ptr += btrfs_extent_inline_ref_size(key.type); 9935d4f98a2SYan Zheng if (ptr >= end) { 9945d4f98a2SYan Zheng WARN_ON(ptr > end); 9955d4f98a2SYan Zheng ptr = 0; 9965d4f98a2SYan Zheng end = 0; 9975d4f98a2SYan Zheng } 9985d4f98a2SYan Zheng } 9995d4f98a2SYan Zheng if (ptr >= end) 10005d4f98a2SYan Zheng path1->slots[0]++; 10015d4f98a2SYan Zheng } 1002b3b4aa74SDavid Sterba btrfs_release_path(path1); 10035d4f98a2SYan Zheng 10045d4f98a2SYan Zheng cur->checked = 1; 10055d4f98a2SYan Zheng WARN_ON(exist); 10065d4f98a2SYan Zheng 10075d4f98a2SYan Zheng /* the pending list isn't empty, take the first block to process */ 10085d4f98a2SYan Zheng if (!list_empty(&list)) { 10095d4f98a2SYan Zheng edge = list_entry(list.next, struct backref_edge, list[UPPER]); 10105d4f98a2SYan Zheng list_del_init(&edge->list[UPPER]); 10115d4f98a2SYan Zheng cur = edge->node[UPPER]; 10125d4f98a2SYan Zheng goto again; 10135d4f98a2SYan Zheng } 10145d4f98a2SYan Zheng 10155d4f98a2SYan Zheng /* 10165d4f98a2SYan Zheng * everything goes well, connect backref nodes and insert backref nodes 10175d4f98a2SYan Zheng * into the cache. 10185d4f98a2SYan Zheng */ 10195d4f98a2SYan Zheng BUG_ON(!node->checked); 10203fd0a558SYan, Zheng cowonly = node->cowonly; 10213fd0a558SYan, Zheng if (!cowonly) { 10223fd0a558SYan, Zheng rb_node = tree_insert(&cache->rb_root, node->bytenr, 10233fd0a558SYan, Zheng &node->rb_node); 102443c04fb1SJeff Mahoney if (rb_node) 102543c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, node->bytenr); 10263fd0a558SYan, Zheng list_add_tail(&node->lower, &cache->leaves); 10273fd0a558SYan, Zheng } 10285d4f98a2SYan Zheng 10295d4f98a2SYan Zheng list_for_each_entry(edge, &node->upper, list[LOWER]) 10305d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &list); 10315d4f98a2SYan Zheng 10325d4f98a2SYan Zheng while (!list_empty(&list)) { 10335d4f98a2SYan Zheng edge = list_entry(list.next, struct backref_edge, list[UPPER]); 10345d4f98a2SYan Zheng list_del_init(&edge->list[UPPER]); 10355d4f98a2SYan Zheng upper = edge->node[UPPER]; 10363fd0a558SYan, Zheng if (upper->detached) { 10373fd0a558SYan, Zheng list_del(&edge->list[LOWER]); 10383fd0a558SYan, Zheng lower = edge->node[LOWER]; 10393fd0a558SYan, Zheng free_backref_edge(cache, edge); 10403fd0a558SYan, Zheng if (list_empty(&lower->upper)) 10413fd0a558SYan, Zheng list_add(&lower->list, &useless); 10423fd0a558SYan, Zheng continue; 10433fd0a558SYan, Zheng } 10445d4f98a2SYan Zheng 10455d4f98a2SYan Zheng if (!RB_EMPTY_NODE(&upper->rb_node)) { 10465d4f98a2SYan Zheng if (upper->lowest) { 10475d4f98a2SYan Zheng list_del_init(&upper->lower); 10485d4f98a2SYan Zheng upper->lowest = 0; 10495d4f98a2SYan Zheng } 10505d4f98a2SYan Zheng 10515d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &upper->lower); 10525d4f98a2SYan Zheng continue; 10535d4f98a2SYan Zheng } 10545d4f98a2SYan Zheng 10555d4f98a2SYan Zheng BUG_ON(!upper->checked); 10563fd0a558SYan, Zheng BUG_ON(cowonly != upper->cowonly); 10573fd0a558SYan, Zheng if (!cowonly) { 10585d4f98a2SYan Zheng rb_node = tree_insert(&cache->rb_root, upper->bytenr, 10595d4f98a2SYan Zheng &upper->rb_node); 106043c04fb1SJeff Mahoney if (rb_node) 106143c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, 106243c04fb1SJeff Mahoney upper->bytenr); 10633fd0a558SYan, Zheng } 10645d4f98a2SYan Zheng 10655d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &upper->lower); 10665d4f98a2SYan Zheng 10675d4f98a2SYan Zheng list_for_each_entry(edge, &upper->upper, list[LOWER]) 10685d4f98a2SYan Zheng list_add_tail(&edge->list[UPPER], &list); 10695d4f98a2SYan Zheng } 10703fd0a558SYan, Zheng /* 10713fd0a558SYan, Zheng * process useless backref nodes. backref nodes for tree leaves 10723fd0a558SYan, Zheng * are deleted from the cache. backref nodes for upper level 10733fd0a558SYan, Zheng * tree blocks are left in the cache to avoid unnecessary backref 10743fd0a558SYan, Zheng * lookup. 10753fd0a558SYan, Zheng */ 10763fd0a558SYan, Zheng while (!list_empty(&useless)) { 10773fd0a558SYan, Zheng upper = list_entry(useless.next, struct backref_node, list); 10783fd0a558SYan, Zheng list_del_init(&upper->list); 10793fd0a558SYan, Zheng BUG_ON(!list_empty(&upper->upper)); 10803fd0a558SYan, Zheng if (upper == node) 10813fd0a558SYan, Zheng node = NULL; 10823fd0a558SYan, Zheng if (upper->lowest) { 10833fd0a558SYan, Zheng list_del_init(&upper->lower); 10843fd0a558SYan, Zheng upper->lowest = 0; 10853fd0a558SYan, Zheng } 10863fd0a558SYan, Zheng while (!list_empty(&upper->lower)) { 10873fd0a558SYan, Zheng edge = list_entry(upper->lower.next, 10883fd0a558SYan, Zheng struct backref_edge, list[UPPER]); 10893fd0a558SYan, Zheng list_del(&edge->list[UPPER]); 10903fd0a558SYan, Zheng list_del(&edge->list[LOWER]); 10913fd0a558SYan, Zheng lower = edge->node[LOWER]; 10923fd0a558SYan, Zheng free_backref_edge(cache, edge); 10933fd0a558SYan, Zheng 10943fd0a558SYan, Zheng if (list_empty(&lower->upper)) 10953fd0a558SYan, Zheng list_add(&lower->list, &useless); 10963fd0a558SYan, Zheng } 10973fd0a558SYan, Zheng __mark_block_processed(rc, upper); 10983fd0a558SYan, Zheng if (upper->level > 0) { 10993fd0a558SYan, Zheng list_add(&upper->list, &cache->detached); 11003fd0a558SYan, Zheng upper->detached = 1; 11013fd0a558SYan, Zheng } else { 11023fd0a558SYan, Zheng rb_erase(&upper->rb_node, &cache->rb_root); 11033fd0a558SYan, Zheng free_backref_node(cache, upper); 11043fd0a558SYan, Zheng } 11053fd0a558SYan, Zheng } 11065d4f98a2SYan Zheng out: 11075d4f98a2SYan Zheng btrfs_free_path(path1); 11085d4f98a2SYan Zheng btrfs_free_path(path2); 11095d4f98a2SYan Zheng if (err) { 11103fd0a558SYan, Zheng while (!list_empty(&useless)) { 11113fd0a558SYan, Zheng lower = list_entry(useless.next, 11123fd0a558SYan, Zheng struct backref_node, upper); 11133fd0a558SYan, Zheng list_del_init(&lower->upper); 11143fd0a558SYan, Zheng } 11155d4f98a2SYan Zheng upper = node; 11163fd0a558SYan, Zheng INIT_LIST_HEAD(&list); 11175d4f98a2SYan Zheng while (upper) { 11185d4f98a2SYan Zheng if (RB_EMPTY_NODE(&upper->rb_node)) { 11195d4f98a2SYan Zheng list_splice_tail(&upper->upper, &list); 11203fd0a558SYan, Zheng free_backref_node(cache, upper); 11215d4f98a2SYan Zheng } 11225d4f98a2SYan Zheng 11235d4f98a2SYan Zheng if (list_empty(&list)) 11245d4f98a2SYan Zheng break; 11255d4f98a2SYan Zheng 11265d4f98a2SYan Zheng edge = list_entry(list.next, struct backref_edge, 11275d4f98a2SYan Zheng list[LOWER]); 11283fd0a558SYan, Zheng list_del(&edge->list[LOWER]); 11295d4f98a2SYan Zheng upper = edge->node[UPPER]; 11303fd0a558SYan, Zheng free_backref_edge(cache, edge); 11315d4f98a2SYan Zheng } 11325d4f98a2SYan Zheng return ERR_PTR(err); 11335d4f98a2SYan Zheng } 11343fd0a558SYan, Zheng BUG_ON(node && node->detached); 11355d4f98a2SYan Zheng return node; 11365d4f98a2SYan Zheng } 11375d4f98a2SYan Zheng 11385d4f98a2SYan Zheng /* 11393fd0a558SYan, Zheng * helper to add backref node for the newly created snapshot. 11403fd0a558SYan, Zheng * the backref node is created by cloning backref node that 11413fd0a558SYan, Zheng * corresponds to root of source tree 11423fd0a558SYan, Zheng */ 11433fd0a558SYan, Zheng static int clone_backref_node(struct btrfs_trans_handle *trans, 11443fd0a558SYan, Zheng struct reloc_control *rc, 11453fd0a558SYan, Zheng struct btrfs_root *src, 11463fd0a558SYan, Zheng struct btrfs_root *dest) 11473fd0a558SYan, Zheng { 11483fd0a558SYan, Zheng struct btrfs_root *reloc_root = src->reloc_root; 11493fd0a558SYan, Zheng struct backref_cache *cache = &rc->backref_cache; 11503fd0a558SYan, Zheng struct backref_node *node = NULL; 11513fd0a558SYan, Zheng struct backref_node *new_node; 11523fd0a558SYan, Zheng struct backref_edge *edge; 11533fd0a558SYan, Zheng struct backref_edge *new_edge; 11543fd0a558SYan, Zheng struct rb_node *rb_node; 11553fd0a558SYan, Zheng 11563fd0a558SYan, Zheng if (cache->last_trans > 0) 11573fd0a558SYan, Zheng update_backref_cache(trans, cache); 11583fd0a558SYan, Zheng 11593fd0a558SYan, Zheng rb_node = tree_search(&cache->rb_root, src->commit_root->start); 11603fd0a558SYan, Zheng if (rb_node) { 11613fd0a558SYan, Zheng node = rb_entry(rb_node, struct backref_node, rb_node); 11623fd0a558SYan, Zheng if (node->detached) 11633fd0a558SYan, Zheng node = NULL; 11643fd0a558SYan, Zheng else 11653fd0a558SYan, Zheng BUG_ON(node->new_bytenr != reloc_root->node->start); 11663fd0a558SYan, Zheng } 11673fd0a558SYan, Zheng 11683fd0a558SYan, Zheng if (!node) { 11693fd0a558SYan, Zheng rb_node = tree_search(&cache->rb_root, 11703fd0a558SYan, Zheng reloc_root->commit_root->start); 11713fd0a558SYan, Zheng if (rb_node) { 11723fd0a558SYan, Zheng node = rb_entry(rb_node, struct backref_node, 11733fd0a558SYan, Zheng rb_node); 11743fd0a558SYan, Zheng BUG_ON(node->detached); 11753fd0a558SYan, Zheng } 11763fd0a558SYan, Zheng } 11773fd0a558SYan, Zheng 11783fd0a558SYan, Zheng if (!node) 11793fd0a558SYan, Zheng return 0; 11803fd0a558SYan, Zheng 11813fd0a558SYan, Zheng new_node = alloc_backref_node(cache); 11823fd0a558SYan, Zheng if (!new_node) 11833fd0a558SYan, Zheng return -ENOMEM; 11843fd0a558SYan, Zheng 11853fd0a558SYan, Zheng new_node->bytenr = dest->node->start; 11863fd0a558SYan, Zheng new_node->level = node->level; 11873fd0a558SYan, Zheng new_node->lowest = node->lowest; 11886848ad64SYan, Zheng new_node->checked = 1; 11893fd0a558SYan, Zheng new_node->root = dest; 11903fd0a558SYan, Zheng 11913fd0a558SYan, Zheng if (!node->lowest) { 11923fd0a558SYan, Zheng list_for_each_entry(edge, &node->lower, list[UPPER]) { 11933fd0a558SYan, Zheng new_edge = alloc_backref_edge(cache); 11943fd0a558SYan, Zheng if (!new_edge) 11953fd0a558SYan, Zheng goto fail; 11963fd0a558SYan, Zheng 11973fd0a558SYan, Zheng new_edge->node[UPPER] = new_node; 11983fd0a558SYan, Zheng new_edge->node[LOWER] = edge->node[LOWER]; 11993fd0a558SYan, Zheng list_add_tail(&new_edge->list[UPPER], 12003fd0a558SYan, Zheng &new_node->lower); 12013fd0a558SYan, Zheng } 120276b9e23dSMiao Xie } else { 120376b9e23dSMiao Xie list_add_tail(&new_node->lower, &cache->leaves); 12043fd0a558SYan, Zheng } 12053fd0a558SYan, Zheng 12063fd0a558SYan, Zheng rb_node = tree_insert(&cache->rb_root, new_node->bytenr, 12073fd0a558SYan, Zheng &new_node->rb_node); 120843c04fb1SJeff Mahoney if (rb_node) 120943c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, new_node->bytenr); 12103fd0a558SYan, Zheng 12113fd0a558SYan, Zheng if (!new_node->lowest) { 12123fd0a558SYan, Zheng list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { 12133fd0a558SYan, Zheng list_add_tail(&new_edge->list[LOWER], 12143fd0a558SYan, Zheng &new_edge->node[LOWER]->upper); 12153fd0a558SYan, Zheng } 12163fd0a558SYan, Zheng } 12173fd0a558SYan, Zheng return 0; 12183fd0a558SYan, Zheng fail: 12193fd0a558SYan, Zheng while (!list_empty(&new_node->lower)) { 12203fd0a558SYan, Zheng new_edge = list_entry(new_node->lower.next, 12213fd0a558SYan, Zheng struct backref_edge, list[UPPER]); 12223fd0a558SYan, Zheng list_del(&new_edge->list[UPPER]); 12233fd0a558SYan, Zheng free_backref_edge(cache, new_edge); 12243fd0a558SYan, Zheng } 12253fd0a558SYan, Zheng free_backref_node(cache, new_node); 12263fd0a558SYan, Zheng return -ENOMEM; 12273fd0a558SYan, Zheng } 12283fd0a558SYan, Zheng 12293fd0a558SYan, Zheng /* 12305d4f98a2SYan Zheng * helper to add 'address of tree root -> reloc tree' mapping 12315d4f98a2SYan Zheng */ 1232ffd7b339SJeff Mahoney static int __must_check __add_reloc_root(struct btrfs_root *root) 12335d4f98a2SYan Zheng { 12345d4f98a2SYan Zheng struct rb_node *rb_node; 12355d4f98a2SYan Zheng struct mapping_node *node; 12365d4f98a2SYan Zheng struct reloc_control *rc = root->fs_info->reloc_ctl; 12375d4f98a2SYan Zheng 12385d4f98a2SYan Zheng node = kmalloc(sizeof(*node), GFP_NOFS); 1239ffd7b339SJeff Mahoney if (!node) 1240ffd7b339SJeff Mahoney return -ENOMEM; 12415d4f98a2SYan Zheng 12425d4f98a2SYan Zheng node->bytenr = root->node->start; 12435d4f98a2SYan Zheng node->data = root; 12445d4f98a2SYan Zheng 12455d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 12465d4f98a2SYan Zheng rb_node = tree_insert(&rc->reloc_root_tree.rb_root, 12475d4f98a2SYan Zheng node->bytenr, &node->rb_node); 12485d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 1249ffd7b339SJeff Mahoney if (rb_node) { 1250ffd7b339SJeff Mahoney btrfs_panic(root->fs_info, -EEXIST, "Duplicate root found " 1251ffd7b339SJeff Mahoney "for start=%llu while inserting into relocation " 1252533574c6SJoe Perches "tree\n", node->bytenr); 125323291a04SDan Carpenter kfree(node); 125423291a04SDan Carpenter return -EEXIST; 1255ffd7b339SJeff Mahoney } 12565d4f98a2SYan Zheng 12575d4f98a2SYan Zheng list_add_tail(&root->root_list, &rc->reloc_roots); 12585d4f98a2SYan Zheng return 0; 12595d4f98a2SYan Zheng } 12605d4f98a2SYan Zheng 12615d4f98a2SYan Zheng /* 12625d4f98a2SYan Zheng * helper to update/delete the 'address of tree root -> reloc tree' 12635d4f98a2SYan Zheng * mapping 12645d4f98a2SYan Zheng */ 12655d4f98a2SYan Zheng static int __update_reloc_root(struct btrfs_root *root, int del) 12665d4f98a2SYan Zheng { 12675d4f98a2SYan Zheng struct rb_node *rb_node; 12685d4f98a2SYan Zheng struct mapping_node *node = NULL; 12695d4f98a2SYan Zheng struct reloc_control *rc = root->fs_info->reloc_ctl; 12705d4f98a2SYan Zheng 12715d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 12725d4f98a2SYan Zheng rb_node = tree_search(&rc->reloc_root_tree.rb_root, 12735d4f98a2SYan Zheng root->commit_root->start); 12745d4f98a2SYan Zheng if (rb_node) { 12755d4f98a2SYan Zheng node = rb_entry(rb_node, struct mapping_node, rb_node); 12765d4f98a2SYan Zheng rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); 12775d4f98a2SYan Zheng } 12785d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 12795d4f98a2SYan Zheng 12808f71f3e0SLiu Bo if (!node) 12818f71f3e0SLiu Bo return 0; 12825d4f98a2SYan Zheng BUG_ON((struct btrfs_root *)node->data != root); 12835d4f98a2SYan Zheng 12845d4f98a2SYan Zheng if (!del) { 12855d4f98a2SYan Zheng spin_lock(&rc->reloc_root_tree.lock); 12865d4f98a2SYan Zheng node->bytenr = root->node->start; 12875d4f98a2SYan Zheng rb_node = tree_insert(&rc->reloc_root_tree.rb_root, 12885d4f98a2SYan Zheng node->bytenr, &node->rb_node); 12895d4f98a2SYan Zheng spin_unlock(&rc->reloc_root_tree.lock); 129043c04fb1SJeff Mahoney if (rb_node) 129143c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, node->bytenr); 12925d4f98a2SYan Zheng } else { 12931daf3540SDaniel J Blueman spin_lock(&root->fs_info->trans_lock); 12945d4f98a2SYan Zheng list_del_init(&root->root_list); 12951daf3540SDaniel J Blueman spin_unlock(&root->fs_info->trans_lock); 12965d4f98a2SYan Zheng kfree(node); 12975d4f98a2SYan Zheng } 12985d4f98a2SYan Zheng return 0; 12995d4f98a2SYan Zheng } 13005d4f98a2SYan Zheng 13013fd0a558SYan, Zheng static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, 13023fd0a558SYan, Zheng struct btrfs_root *root, u64 objectid) 13035d4f98a2SYan Zheng { 13045d4f98a2SYan Zheng struct btrfs_root *reloc_root; 13055d4f98a2SYan Zheng struct extent_buffer *eb; 13065d4f98a2SYan Zheng struct btrfs_root_item *root_item; 13075d4f98a2SYan Zheng struct btrfs_key root_key; 13085bc7247aSMiao Xie u64 last_snap = 0; 13095d4f98a2SYan Zheng int ret; 13105d4f98a2SYan Zheng 13115d4f98a2SYan Zheng root_item = kmalloc(sizeof(*root_item), GFP_NOFS); 13125d4f98a2SYan Zheng BUG_ON(!root_item); 13135d4f98a2SYan Zheng 13145d4f98a2SYan Zheng root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; 13155d4f98a2SYan Zheng root_key.type = BTRFS_ROOT_ITEM_KEY; 13163fd0a558SYan, Zheng root_key.offset = objectid; 13175d4f98a2SYan Zheng 13183fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 13193fd0a558SYan, Zheng /* called by btrfs_init_reloc_root */ 13205d4f98a2SYan Zheng ret = btrfs_copy_root(trans, root, root->commit_root, &eb, 13215d4f98a2SYan Zheng BTRFS_TREE_RELOC_OBJECTID); 13225d4f98a2SYan Zheng BUG_ON(ret); 13235d4f98a2SYan Zheng 13245bc7247aSMiao Xie last_snap = btrfs_root_last_snapshot(&root->root_item); 13253fd0a558SYan, Zheng btrfs_set_root_last_snapshot(&root->root_item, 13263fd0a558SYan, Zheng trans->transid - 1); 13273fd0a558SYan, Zheng } else { 13283fd0a558SYan, Zheng /* 13293fd0a558SYan, Zheng * called by btrfs_reloc_post_snapshot_hook. 13303fd0a558SYan, Zheng * the source tree is a reloc tree, all tree blocks 13313fd0a558SYan, Zheng * modified after it was created have RELOC flag 13323fd0a558SYan, Zheng * set in their headers. so it's OK to not update 13333fd0a558SYan, Zheng * the 'last_snapshot'. 13343fd0a558SYan, Zheng */ 13353fd0a558SYan, Zheng ret = btrfs_copy_root(trans, root, root->node, &eb, 13363fd0a558SYan, Zheng BTRFS_TREE_RELOC_OBJECTID); 13373fd0a558SYan, Zheng BUG_ON(ret); 13383fd0a558SYan, Zheng } 13393fd0a558SYan, Zheng 13405d4f98a2SYan Zheng memcpy(root_item, &root->root_item, sizeof(*root_item)); 13415d4f98a2SYan Zheng btrfs_set_root_bytenr(root_item, eb->start); 13425d4f98a2SYan Zheng btrfs_set_root_level(root_item, btrfs_header_level(eb)); 13435d4f98a2SYan Zheng btrfs_set_root_generation(root_item, trans->transid); 13443fd0a558SYan, Zheng 13453fd0a558SYan, Zheng if (root->root_key.objectid == objectid) { 13463fd0a558SYan, Zheng btrfs_set_root_refs(root_item, 0); 13473fd0a558SYan, Zheng memset(&root_item->drop_progress, 0, 13483fd0a558SYan, Zheng sizeof(struct btrfs_disk_key)); 13495d4f98a2SYan Zheng root_item->drop_level = 0; 13505bc7247aSMiao Xie /* 13515bc7247aSMiao Xie * abuse rtransid, it is safe because it is impossible to 13525bc7247aSMiao Xie * receive data into a relocation tree. 13535bc7247aSMiao Xie */ 13545bc7247aSMiao Xie btrfs_set_root_rtransid(root_item, last_snap); 13555bc7247aSMiao Xie btrfs_set_root_otransid(root_item, trans->transid); 13563fd0a558SYan, Zheng } 13575d4f98a2SYan Zheng 13585d4f98a2SYan Zheng btrfs_tree_unlock(eb); 13595d4f98a2SYan Zheng free_extent_buffer(eb); 13605d4f98a2SYan Zheng 13615d4f98a2SYan Zheng ret = btrfs_insert_root(trans, root->fs_info->tree_root, 13625d4f98a2SYan Zheng &root_key, root_item); 13635d4f98a2SYan Zheng BUG_ON(ret); 13645d4f98a2SYan Zheng kfree(root_item); 13655d4f98a2SYan Zheng 1366cb517eabSMiao Xie reloc_root = btrfs_read_fs_root(root->fs_info->tree_root, &root_key); 13675d4f98a2SYan Zheng BUG_ON(IS_ERR(reloc_root)); 13685d4f98a2SYan Zheng reloc_root->last_trans = trans->transid; 13693fd0a558SYan, Zheng return reloc_root; 13703fd0a558SYan, Zheng } 13713fd0a558SYan, Zheng 13723fd0a558SYan, Zheng /* 13733fd0a558SYan, Zheng * create reloc tree for a given fs tree. reloc tree is just a 13743fd0a558SYan, Zheng * snapshot of the fs tree with special root objectid. 13753fd0a558SYan, Zheng */ 13763fd0a558SYan, Zheng int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 13773fd0a558SYan, Zheng struct btrfs_root *root) 13783fd0a558SYan, Zheng { 13793fd0a558SYan, Zheng struct btrfs_root *reloc_root; 13803fd0a558SYan, Zheng struct reloc_control *rc = root->fs_info->reloc_ctl; 13813fd0a558SYan, Zheng int clear_rsv = 0; 1382ffd7b339SJeff Mahoney int ret; 13833fd0a558SYan, Zheng 13843fd0a558SYan, Zheng if (root->reloc_root) { 13853fd0a558SYan, Zheng reloc_root = root->reloc_root; 13863fd0a558SYan, Zheng reloc_root->last_trans = trans->transid; 13873fd0a558SYan, Zheng return 0; 13883fd0a558SYan, Zheng } 13893fd0a558SYan, Zheng 13903fd0a558SYan, Zheng if (!rc || !rc->create_reloc_tree || 13913fd0a558SYan, Zheng root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 13923fd0a558SYan, Zheng return 0; 13933fd0a558SYan, Zheng 13943fd0a558SYan, Zheng if (!trans->block_rsv) { 13953fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 13963fd0a558SYan, Zheng clear_rsv = 1; 13973fd0a558SYan, Zheng } 13983fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root, root->root_key.objectid); 13993fd0a558SYan, Zheng if (clear_rsv) 14003fd0a558SYan, Zheng trans->block_rsv = NULL; 14015d4f98a2SYan Zheng 1402ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 1403ffd7b339SJeff Mahoney BUG_ON(ret < 0); 14045d4f98a2SYan Zheng root->reloc_root = reloc_root; 14055d4f98a2SYan Zheng return 0; 14065d4f98a2SYan Zheng } 14075d4f98a2SYan Zheng 14085d4f98a2SYan Zheng /* 14095d4f98a2SYan Zheng * update root item of reloc tree 14105d4f98a2SYan Zheng */ 14115d4f98a2SYan Zheng int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 14125d4f98a2SYan Zheng struct btrfs_root *root) 14135d4f98a2SYan Zheng { 14145d4f98a2SYan Zheng struct btrfs_root *reloc_root; 14155d4f98a2SYan Zheng struct btrfs_root_item *root_item; 14165d4f98a2SYan Zheng int del = 0; 14175d4f98a2SYan Zheng int ret; 14185d4f98a2SYan Zheng 14195d4f98a2SYan Zheng if (!root->reloc_root) 14207585717fSChris Mason goto out; 14215d4f98a2SYan Zheng 14225d4f98a2SYan Zheng reloc_root = root->reloc_root; 14235d4f98a2SYan Zheng root_item = &reloc_root->root_item; 14245d4f98a2SYan Zheng 14253fd0a558SYan, Zheng if (root->fs_info->reloc_ctl->merge_reloc_tree && 14263fd0a558SYan, Zheng btrfs_root_refs(root_item) == 0) { 14275d4f98a2SYan Zheng root->reloc_root = NULL; 14285d4f98a2SYan Zheng del = 1; 14295d4f98a2SYan Zheng } 14305d4f98a2SYan Zheng 14315d4f98a2SYan Zheng __update_reloc_root(reloc_root, del); 14325d4f98a2SYan Zheng 14335d4f98a2SYan Zheng if (reloc_root->commit_root != reloc_root->node) { 14345d4f98a2SYan Zheng btrfs_set_root_node(root_item, reloc_root->node); 14355d4f98a2SYan Zheng free_extent_buffer(reloc_root->commit_root); 14365d4f98a2SYan Zheng reloc_root->commit_root = btrfs_root_node(reloc_root); 14375d4f98a2SYan Zheng } 14385d4f98a2SYan Zheng 14395d4f98a2SYan Zheng ret = btrfs_update_root(trans, root->fs_info->tree_root, 14405d4f98a2SYan Zheng &reloc_root->root_key, root_item); 14415d4f98a2SYan Zheng BUG_ON(ret); 14427585717fSChris Mason 14437585717fSChris Mason out: 14445d4f98a2SYan Zheng return 0; 14455d4f98a2SYan Zheng } 14465d4f98a2SYan Zheng 14475d4f98a2SYan Zheng /* 14485d4f98a2SYan Zheng * helper to find first cached inode with inode number >= objectid 14495d4f98a2SYan Zheng * in a subvolume 14505d4f98a2SYan Zheng */ 14515d4f98a2SYan Zheng static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) 14525d4f98a2SYan Zheng { 14535d4f98a2SYan Zheng struct rb_node *node; 14545d4f98a2SYan Zheng struct rb_node *prev; 14555d4f98a2SYan Zheng struct btrfs_inode *entry; 14565d4f98a2SYan Zheng struct inode *inode; 14575d4f98a2SYan Zheng 14585d4f98a2SYan Zheng spin_lock(&root->inode_lock); 14595d4f98a2SYan Zheng again: 14605d4f98a2SYan Zheng node = root->inode_tree.rb_node; 14615d4f98a2SYan Zheng prev = NULL; 14625d4f98a2SYan Zheng while (node) { 14635d4f98a2SYan Zheng prev = node; 14645d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 14655d4f98a2SYan Zheng 146633345d01SLi Zefan if (objectid < btrfs_ino(&entry->vfs_inode)) 14675d4f98a2SYan Zheng node = node->rb_left; 146833345d01SLi Zefan else if (objectid > btrfs_ino(&entry->vfs_inode)) 14695d4f98a2SYan Zheng node = node->rb_right; 14705d4f98a2SYan Zheng else 14715d4f98a2SYan Zheng break; 14725d4f98a2SYan Zheng } 14735d4f98a2SYan Zheng if (!node) { 14745d4f98a2SYan Zheng while (prev) { 14755d4f98a2SYan Zheng entry = rb_entry(prev, struct btrfs_inode, rb_node); 147633345d01SLi Zefan if (objectid <= btrfs_ino(&entry->vfs_inode)) { 14775d4f98a2SYan Zheng node = prev; 14785d4f98a2SYan Zheng break; 14795d4f98a2SYan Zheng } 14805d4f98a2SYan Zheng prev = rb_next(prev); 14815d4f98a2SYan Zheng } 14825d4f98a2SYan Zheng } 14835d4f98a2SYan Zheng while (node) { 14845d4f98a2SYan Zheng entry = rb_entry(node, struct btrfs_inode, rb_node); 14855d4f98a2SYan Zheng inode = igrab(&entry->vfs_inode); 14865d4f98a2SYan Zheng if (inode) { 14875d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 14885d4f98a2SYan Zheng return inode; 14895d4f98a2SYan Zheng } 14905d4f98a2SYan Zheng 149133345d01SLi Zefan objectid = btrfs_ino(&entry->vfs_inode) + 1; 14925d4f98a2SYan Zheng if (cond_resched_lock(&root->inode_lock)) 14935d4f98a2SYan Zheng goto again; 14945d4f98a2SYan Zheng 14955d4f98a2SYan Zheng node = rb_next(node); 14965d4f98a2SYan Zheng } 14975d4f98a2SYan Zheng spin_unlock(&root->inode_lock); 14985d4f98a2SYan Zheng return NULL; 14995d4f98a2SYan Zheng } 15005d4f98a2SYan Zheng 15015d4f98a2SYan Zheng static int in_block_group(u64 bytenr, 15025d4f98a2SYan Zheng struct btrfs_block_group_cache *block_group) 15035d4f98a2SYan Zheng { 15045d4f98a2SYan Zheng if (bytenr >= block_group->key.objectid && 15055d4f98a2SYan Zheng bytenr < block_group->key.objectid + block_group->key.offset) 15065d4f98a2SYan Zheng return 1; 15075d4f98a2SYan Zheng return 0; 15085d4f98a2SYan Zheng } 15095d4f98a2SYan Zheng 15105d4f98a2SYan Zheng /* 15115d4f98a2SYan Zheng * get new location of data 15125d4f98a2SYan Zheng */ 15135d4f98a2SYan Zheng static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, 15145d4f98a2SYan Zheng u64 bytenr, u64 num_bytes) 15155d4f98a2SYan Zheng { 15165d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(reloc_inode)->root; 15175d4f98a2SYan Zheng struct btrfs_path *path; 15185d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 15195d4f98a2SYan Zheng struct extent_buffer *leaf; 15205d4f98a2SYan Zheng int ret; 15215d4f98a2SYan Zheng 15225d4f98a2SYan Zheng path = btrfs_alloc_path(); 15235d4f98a2SYan Zheng if (!path) 15245d4f98a2SYan Zheng return -ENOMEM; 15255d4f98a2SYan Zheng 15265d4f98a2SYan Zheng bytenr -= BTRFS_I(reloc_inode)->index_cnt; 152733345d01SLi Zefan ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(reloc_inode), 15285d4f98a2SYan Zheng bytenr, 0); 15295d4f98a2SYan Zheng if (ret < 0) 15305d4f98a2SYan Zheng goto out; 15315d4f98a2SYan Zheng if (ret > 0) { 15325d4f98a2SYan Zheng ret = -ENOENT; 15335d4f98a2SYan Zheng goto out; 15345d4f98a2SYan Zheng } 15355d4f98a2SYan Zheng 15365d4f98a2SYan Zheng leaf = path->nodes[0]; 15375d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, path->slots[0], 15385d4f98a2SYan Zheng struct btrfs_file_extent_item); 15395d4f98a2SYan Zheng 15405d4f98a2SYan Zheng BUG_ON(btrfs_file_extent_offset(leaf, fi) || 15415d4f98a2SYan Zheng btrfs_file_extent_compression(leaf, fi) || 15425d4f98a2SYan Zheng btrfs_file_extent_encryption(leaf, fi) || 15435d4f98a2SYan Zheng btrfs_file_extent_other_encoding(leaf, fi)); 15445d4f98a2SYan Zheng 15455d4f98a2SYan Zheng if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { 15465d4f98a2SYan Zheng ret = 1; 15475d4f98a2SYan Zheng goto out; 15485d4f98a2SYan Zheng } 15495d4f98a2SYan Zheng 15505d4f98a2SYan Zheng *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 15515d4f98a2SYan Zheng ret = 0; 15525d4f98a2SYan Zheng out: 15535d4f98a2SYan Zheng btrfs_free_path(path); 15545d4f98a2SYan Zheng return ret; 15555d4f98a2SYan Zheng } 15565d4f98a2SYan Zheng 15575d4f98a2SYan Zheng /* 15585d4f98a2SYan Zheng * update file extent items in the tree leaf to point to 15595d4f98a2SYan Zheng * the new locations. 15605d4f98a2SYan Zheng */ 15613fd0a558SYan, Zheng static noinline_for_stack 15623fd0a558SYan, Zheng int replace_file_extents(struct btrfs_trans_handle *trans, 15635d4f98a2SYan Zheng struct reloc_control *rc, 15645d4f98a2SYan Zheng struct btrfs_root *root, 15653fd0a558SYan, Zheng struct extent_buffer *leaf) 15665d4f98a2SYan Zheng { 15675d4f98a2SYan Zheng struct btrfs_key key; 15685d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 15695d4f98a2SYan Zheng struct inode *inode = NULL; 15705d4f98a2SYan Zheng u64 parent; 15715d4f98a2SYan Zheng u64 bytenr; 15723fd0a558SYan, Zheng u64 new_bytenr = 0; 15735d4f98a2SYan Zheng u64 num_bytes; 15745d4f98a2SYan Zheng u64 end; 15755d4f98a2SYan Zheng u32 nritems; 15765d4f98a2SYan Zheng u32 i; 15775d4f98a2SYan Zheng int ret; 15785d4f98a2SYan Zheng int first = 1; 15795d4f98a2SYan Zheng int dirty = 0; 15805d4f98a2SYan Zheng 15815d4f98a2SYan Zheng if (rc->stage != UPDATE_DATA_PTRS) 15825d4f98a2SYan Zheng return 0; 15835d4f98a2SYan Zheng 15845d4f98a2SYan Zheng /* reloc trees always use full backref */ 15855d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) 15865d4f98a2SYan Zheng parent = leaf->start; 15875d4f98a2SYan Zheng else 15885d4f98a2SYan Zheng parent = 0; 15895d4f98a2SYan Zheng 15905d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 15915d4f98a2SYan Zheng for (i = 0; i < nritems; i++) { 15925d4f98a2SYan Zheng cond_resched(); 15935d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, i); 15945d4f98a2SYan Zheng if (key.type != BTRFS_EXTENT_DATA_KEY) 15955d4f98a2SYan Zheng continue; 15965d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); 15975d4f98a2SYan Zheng if (btrfs_file_extent_type(leaf, fi) == 15985d4f98a2SYan Zheng BTRFS_FILE_EXTENT_INLINE) 15995d4f98a2SYan Zheng continue; 16005d4f98a2SYan Zheng bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); 16015d4f98a2SYan Zheng num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); 16025d4f98a2SYan Zheng if (bytenr == 0) 16035d4f98a2SYan Zheng continue; 16045d4f98a2SYan Zheng if (!in_block_group(bytenr, rc->block_group)) 16055d4f98a2SYan Zheng continue; 16065d4f98a2SYan Zheng 16075d4f98a2SYan Zheng /* 16085d4f98a2SYan Zheng * if we are modifying block in fs tree, wait for readpage 16095d4f98a2SYan Zheng * to complete and drop the extent cache 16105d4f98a2SYan Zheng */ 16115d4f98a2SYan Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { 16125d4f98a2SYan Zheng if (first) { 16135d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 16145d4f98a2SYan Zheng first = 0; 161533345d01SLi Zefan } else if (inode && btrfs_ino(inode) < key.objectid) { 16163fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 16175d4f98a2SYan Zheng inode = find_next_inode(root, key.objectid); 16185d4f98a2SYan Zheng } 161933345d01SLi Zefan if (inode && btrfs_ino(inode) == key.objectid) { 16205d4f98a2SYan Zheng end = key.offset + 16215d4f98a2SYan Zheng btrfs_file_extent_num_bytes(leaf, fi); 16225d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(key.offset, 16235d4f98a2SYan Zheng root->sectorsize)); 16245d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(end, root->sectorsize)); 16255d4f98a2SYan Zheng end--; 16265d4f98a2SYan Zheng ret = try_lock_extent(&BTRFS_I(inode)->io_tree, 1627d0082371SJeff Mahoney key.offset, end); 16285d4f98a2SYan Zheng if (!ret) 16295d4f98a2SYan Zheng continue; 16305d4f98a2SYan Zheng 16315d4f98a2SYan Zheng btrfs_drop_extent_cache(inode, key.offset, end, 16325d4f98a2SYan Zheng 1); 16335d4f98a2SYan Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 1634d0082371SJeff Mahoney key.offset, end); 16355d4f98a2SYan Zheng } 16365d4f98a2SYan Zheng } 16375d4f98a2SYan Zheng 16385d4f98a2SYan Zheng ret = get_new_location(rc->data_inode, &new_bytenr, 16395d4f98a2SYan Zheng bytenr, num_bytes); 16403fd0a558SYan, Zheng if (ret > 0) { 16413fd0a558SYan, Zheng WARN_ON(1); 16425d4f98a2SYan Zheng continue; 16433fd0a558SYan, Zheng } 16445d4f98a2SYan Zheng BUG_ON(ret < 0); 16455d4f98a2SYan Zheng 16465d4f98a2SYan Zheng btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); 16475d4f98a2SYan Zheng dirty = 1; 16485d4f98a2SYan Zheng 16495d4f98a2SYan Zheng key.offset -= btrfs_file_extent_offset(leaf, fi); 16505d4f98a2SYan Zheng ret = btrfs_inc_extent_ref(trans, root, new_bytenr, 16515d4f98a2SYan Zheng num_bytes, parent, 16525d4f98a2SYan Zheng btrfs_header_owner(leaf), 165366d7e7f0SArne Jansen key.objectid, key.offset, 1); 16545d4f98a2SYan Zheng BUG_ON(ret); 16555d4f98a2SYan Zheng 16565d4f98a2SYan Zheng ret = btrfs_free_extent(trans, root, bytenr, num_bytes, 16575d4f98a2SYan Zheng parent, btrfs_header_owner(leaf), 165866d7e7f0SArne Jansen key.objectid, key.offset, 1); 16595d4f98a2SYan Zheng BUG_ON(ret); 16605d4f98a2SYan Zheng } 16615d4f98a2SYan Zheng if (dirty) 16625d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 16633fd0a558SYan, Zheng if (inode) 16643fd0a558SYan, Zheng btrfs_add_delayed_iput(inode); 16655d4f98a2SYan Zheng return 0; 16665d4f98a2SYan Zheng } 16675d4f98a2SYan Zheng 16685d4f98a2SYan Zheng static noinline_for_stack 16695d4f98a2SYan Zheng int memcmp_node_keys(struct extent_buffer *eb, int slot, 16705d4f98a2SYan Zheng struct btrfs_path *path, int level) 16715d4f98a2SYan Zheng { 16725d4f98a2SYan Zheng struct btrfs_disk_key key1; 16735d4f98a2SYan Zheng struct btrfs_disk_key key2; 16745d4f98a2SYan Zheng btrfs_node_key(eb, &key1, slot); 16755d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &key2, path->slots[level]); 16765d4f98a2SYan Zheng return memcmp(&key1, &key2, sizeof(key1)); 16775d4f98a2SYan Zheng } 16785d4f98a2SYan Zheng 16795d4f98a2SYan Zheng /* 16805d4f98a2SYan Zheng * try to replace tree blocks in fs tree with the new blocks 16815d4f98a2SYan Zheng * in reloc tree. tree blocks haven't been modified since the 16825d4f98a2SYan Zheng * reloc tree was create can be replaced. 16835d4f98a2SYan Zheng * 16845d4f98a2SYan Zheng * if a block was replaced, level of the block + 1 is returned. 16855d4f98a2SYan Zheng * if no block got replaced, 0 is returned. if there are other 16865d4f98a2SYan Zheng * errors, a negative error number is returned. 16875d4f98a2SYan Zheng */ 16883fd0a558SYan, Zheng static noinline_for_stack 16893fd0a558SYan, Zheng int replace_path(struct btrfs_trans_handle *trans, 16905d4f98a2SYan Zheng struct btrfs_root *dest, struct btrfs_root *src, 16915d4f98a2SYan Zheng struct btrfs_path *path, struct btrfs_key *next_key, 16925d4f98a2SYan Zheng int lowest_level, int max_level) 16935d4f98a2SYan Zheng { 16945d4f98a2SYan Zheng struct extent_buffer *eb; 16955d4f98a2SYan Zheng struct extent_buffer *parent; 16965d4f98a2SYan Zheng struct btrfs_key key; 16975d4f98a2SYan Zheng u64 old_bytenr; 16985d4f98a2SYan Zheng u64 new_bytenr; 16995d4f98a2SYan Zheng u64 old_ptr_gen; 17005d4f98a2SYan Zheng u64 new_ptr_gen; 17015d4f98a2SYan Zheng u64 last_snapshot; 17025d4f98a2SYan Zheng u32 blocksize; 17033fd0a558SYan, Zheng int cow = 0; 17045d4f98a2SYan Zheng int level; 17055d4f98a2SYan Zheng int ret; 17065d4f98a2SYan Zheng int slot; 17075d4f98a2SYan Zheng 17085d4f98a2SYan Zheng BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); 17095d4f98a2SYan Zheng BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); 17105d4f98a2SYan Zheng 17115d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&src->root_item); 17123fd0a558SYan, Zheng again: 17135d4f98a2SYan Zheng slot = path->slots[lowest_level]; 17145d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); 17155d4f98a2SYan Zheng 17165d4f98a2SYan Zheng eb = btrfs_lock_root_node(dest); 17175d4f98a2SYan Zheng btrfs_set_lock_blocking(eb); 17185d4f98a2SYan Zheng level = btrfs_header_level(eb); 17195d4f98a2SYan Zheng 17205d4f98a2SYan Zheng if (level < lowest_level) { 17215d4f98a2SYan Zheng btrfs_tree_unlock(eb); 17225d4f98a2SYan Zheng free_extent_buffer(eb); 17235d4f98a2SYan Zheng return 0; 17245d4f98a2SYan Zheng } 17255d4f98a2SYan Zheng 17263fd0a558SYan, Zheng if (cow) { 17275d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); 17285d4f98a2SYan Zheng BUG_ON(ret); 17293fd0a558SYan, Zheng } 17305d4f98a2SYan Zheng btrfs_set_lock_blocking(eb); 17315d4f98a2SYan Zheng 17325d4f98a2SYan Zheng if (next_key) { 17335d4f98a2SYan Zheng next_key->objectid = (u64)-1; 17345d4f98a2SYan Zheng next_key->type = (u8)-1; 17355d4f98a2SYan Zheng next_key->offset = (u64)-1; 17365d4f98a2SYan Zheng } 17375d4f98a2SYan Zheng 17385d4f98a2SYan Zheng parent = eb; 17395d4f98a2SYan Zheng while (1) { 17405d4f98a2SYan Zheng level = btrfs_header_level(parent); 17415d4f98a2SYan Zheng BUG_ON(level < lowest_level); 17425d4f98a2SYan Zheng 17435d4f98a2SYan Zheng ret = btrfs_bin_search(parent, &key, level, &slot); 17445d4f98a2SYan Zheng if (ret && slot > 0) 17455d4f98a2SYan Zheng slot--; 17465d4f98a2SYan Zheng 17475d4f98a2SYan Zheng if (next_key && slot + 1 < btrfs_header_nritems(parent)) 17485d4f98a2SYan Zheng btrfs_node_key_to_cpu(parent, next_key, slot + 1); 17495d4f98a2SYan Zheng 17505d4f98a2SYan Zheng old_bytenr = btrfs_node_blockptr(parent, slot); 17515d4f98a2SYan Zheng blocksize = btrfs_level_size(dest, level - 1); 17525d4f98a2SYan Zheng old_ptr_gen = btrfs_node_ptr_generation(parent, slot); 17535d4f98a2SYan Zheng 17545d4f98a2SYan Zheng if (level <= max_level) { 17555d4f98a2SYan Zheng eb = path->nodes[level]; 17565d4f98a2SYan Zheng new_bytenr = btrfs_node_blockptr(eb, 17575d4f98a2SYan Zheng path->slots[level]); 17585d4f98a2SYan Zheng new_ptr_gen = btrfs_node_ptr_generation(eb, 17595d4f98a2SYan Zheng path->slots[level]); 17605d4f98a2SYan Zheng } else { 17615d4f98a2SYan Zheng new_bytenr = 0; 17625d4f98a2SYan Zheng new_ptr_gen = 0; 17635d4f98a2SYan Zheng } 17645d4f98a2SYan Zheng 17655d4f98a2SYan Zheng if (new_bytenr > 0 && new_bytenr == old_bytenr) { 17665d4f98a2SYan Zheng WARN_ON(1); 17675d4f98a2SYan Zheng ret = level; 17685d4f98a2SYan Zheng break; 17695d4f98a2SYan Zheng } 17705d4f98a2SYan Zheng 17715d4f98a2SYan Zheng if (new_bytenr == 0 || old_ptr_gen > last_snapshot || 17725d4f98a2SYan Zheng memcmp_node_keys(parent, slot, path, level)) { 17733fd0a558SYan, Zheng if (level <= lowest_level) { 17745d4f98a2SYan Zheng ret = 0; 17755d4f98a2SYan Zheng break; 17765d4f98a2SYan Zheng } 17775d4f98a2SYan Zheng 17785d4f98a2SYan Zheng eb = read_tree_block(dest, old_bytenr, blocksize, 17795d4f98a2SYan Zheng old_ptr_gen); 1780416bc658SJosef Bacik if (!eb || !extent_buffer_uptodate(eb)) { 1781416bc658SJosef Bacik ret = (!eb) ? -ENOMEM : -EIO; 1782416bc658SJosef Bacik free_extent_buffer(eb); 1783379cde74SStefan Behrens break; 1784416bc658SJosef Bacik } 17855d4f98a2SYan Zheng btrfs_tree_lock(eb); 17863fd0a558SYan, Zheng if (cow) { 17875d4f98a2SYan Zheng ret = btrfs_cow_block(trans, dest, eb, parent, 17885d4f98a2SYan Zheng slot, &eb); 17895d4f98a2SYan Zheng BUG_ON(ret); 17905d4f98a2SYan Zheng } 17913fd0a558SYan, Zheng btrfs_set_lock_blocking(eb); 17925d4f98a2SYan Zheng 17935d4f98a2SYan Zheng btrfs_tree_unlock(parent); 17945d4f98a2SYan Zheng free_extent_buffer(parent); 17955d4f98a2SYan Zheng 17965d4f98a2SYan Zheng parent = eb; 17975d4f98a2SYan Zheng continue; 17985d4f98a2SYan Zheng } 17995d4f98a2SYan Zheng 18003fd0a558SYan, Zheng if (!cow) { 18013fd0a558SYan, Zheng btrfs_tree_unlock(parent); 18023fd0a558SYan, Zheng free_extent_buffer(parent); 18033fd0a558SYan, Zheng cow = 1; 18043fd0a558SYan, Zheng goto again; 18053fd0a558SYan, Zheng } 18063fd0a558SYan, Zheng 18075d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 18085d4f98a2SYan Zheng path->slots[level]); 1809b3b4aa74SDavid Sterba btrfs_release_path(path); 18105d4f98a2SYan Zheng 18115d4f98a2SYan Zheng path->lowest_level = level; 18125d4f98a2SYan Zheng ret = btrfs_search_slot(trans, src, &key, path, 0, 1); 18135d4f98a2SYan Zheng path->lowest_level = 0; 18145d4f98a2SYan Zheng BUG_ON(ret); 18155d4f98a2SYan Zheng 18165d4f98a2SYan Zheng /* 18175d4f98a2SYan Zheng * swap blocks in fs tree and reloc tree. 18185d4f98a2SYan Zheng */ 18195d4f98a2SYan Zheng btrfs_set_node_blockptr(parent, slot, new_bytenr); 18205d4f98a2SYan Zheng btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); 18215d4f98a2SYan Zheng btrfs_mark_buffer_dirty(parent); 18225d4f98a2SYan Zheng 18235d4f98a2SYan Zheng btrfs_set_node_blockptr(path->nodes[level], 18245d4f98a2SYan Zheng path->slots[level], old_bytenr); 18255d4f98a2SYan Zheng btrfs_set_node_ptr_generation(path->nodes[level], 18265d4f98a2SYan Zheng path->slots[level], old_ptr_gen); 18275d4f98a2SYan Zheng btrfs_mark_buffer_dirty(path->nodes[level]); 18285d4f98a2SYan Zheng 18295d4f98a2SYan Zheng ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize, 18305d4f98a2SYan Zheng path->nodes[level]->start, 183166d7e7f0SArne Jansen src->root_key.objectid, level - 1, 0, 183266d7e7f0SArne Jansen 1); 18335d4f98a2SYan Zheng BUG_ON(ret); 18345d4f98a2SYan Zheng ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize, 18355d4f98a2SYan Zheng 0, dest->root_key.objectid, level - 1, 183666d7e7f0SArne Jansen 0, 1); 18375d4f98a2SYan Zheng BUG_ON(ret); 18385d4f98a2SYan Zheng 18395d4f98a2SYan Zheng ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, 18405d4f98a2SYan Zheng path->nodes[level]->start, 184166d7e7f0SArne Jansen src->root_key.objectid, level - 1, 0, 184266d7e7f0SArne Jansen 1); 18435d4f98a2SYan Zheng BUG_ON(ret); 18445d4f98a2SYan Zheng 18455d4f98a2SYan Zheng ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, 18465d4f98a2SYan Zheng 0, dest->root_key.objectid, level - 1, 184766d7e7f0SArne Jansen 0, 1); 18485d4f98a2SYan Zheng BUG_ON(ret); 18495d4f98a2SYan Zheng 18505d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 18515d4f98a2SYan Zheng 18525d4f98a2SYan Zheng ret = level; 18535d4f98a2SYan Zheng break; 18545d4f98a2SYan Zheng } 18555d4f98a2SYan Zheng btrfs_tree_unlock(parent); 18565d4f98a2SYan Zheng free_extent_buffer(parent); 18575d4f98a2SYan Zheng return ret; 18585d4f98a2SYan Zheng } 18595d4f98a2SYan Zheng 18605d4f98a2SYan Zheng /* 18615d4f98a2SYan Zheng * helper to find next relocated block in reloc tree 18625d4f98a2SYan Zheng */ 18635d4f98a2SYan Zheng static noinline_for_stack 18645d4f98a2SYan Zheng int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 18655d4f98a2SYan Zheng int *level) 18665d4f98a2SYan Zheng { 18675d4f98a2SYan Zheng struct extent_buffer *eb; 18685d4f98a2SYan Zheng int i; 18695d4f98a2SYan Zheng u64 last_snapshot; 18705d4f98a2SYan Zheng u32 nritems; 18715d4f98a2SYan Zheng 18725d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 18735d4f98a2SYan Zheng 18745d4f98a2SYan Zheng for (i = 0; i < *level; i++) { 18755d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 18765d4f98a2SYan Zheng path->nodes[i] = NULL; 18775d4f98a2SYan Zheng } 18785d4f98a2SYan Zheng 18795d4f98a2SYan Zheng for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { 18805d4f98a2SYan Zheng eb = path->nodes[i]; 18815d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 18825d4f98a2SYan Zheng while (path->slots[i] + 1 < nritems) { 18835d4f98a2SYan Zheng path->slots[i]++; 18845d4f98a2SYan Zheng if (btrfs_node_ptr_generation(eb, path->slots[i]) <= 18855d4f98a2SYan Zheng last_snapshot) 18865d4f98a2SYan Zheng continue; 18875d4f98a2SYan Zheng 18885d4f98a2SYan Zheng *level = i; 18895d4f98a2SYan Zheng return 0; 18905d4f98a2SYan Zheng } 18915d4f98a2SYan Zheng free_extent_buffer(path->nodes[i]); 18925d4f98a2SYan Zheng path->nodes[i] = NULL; 18935d4f98a2SYan Zheng } 18945d4f98a2SYan Zheng return 1; 18955d4f98a2SYan Zheng } 18965d4f98a2SYan Zheng 18975d4f98a2SYan Zheng /* 18985d4f98a2SYan Zheng * walk down reloc tree to find relocated block of lowest level 18995d4f98a2SYan Zheng */ 19005d4f98a2SYan Zheng static noinline_for_stack 19015d4f98a2SYan Zheng int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, 19025d4f98a2SYan Zheng int *level) 19035d4f98a2SYan Zheng { 19045d4f98a2SYan Zheng struct extent_buffer *eb = NULL; 19055d4f98a2SYan Zheng int i; 19065d4f98a2SYan Zheng u64 bytenr; 19075d4f98a2SYan Zheng u64 ptr_gen = 0; 19085d4f98a2SYan Zheng u64 last_snapshot; 19095d4f98a2SYan Zheng u32 blocksize; 19105d4f98a2SYan Zheng u32 nritems; 19115d4f98a2SYan Zheng 19125d4f98a2SYan Zheng last_snapshot = btrfs_root_last_snapshot(&root->root_item); 19135d4f98a2SYan Zheng 19145d4f98a2SYan Zheng for (i = *level; i > 0; i--) { 19155d4f98a2SYan Zheng eb = path->nodes[i]; 19165d4f98a2SYan Zheng nritems = btrfs_header_nritems(eb); 19175d4f98a2SYan Zheng while (path->slots[i] < nritems) { 19185d4f98a2SYan Zheng ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); 19195d4f98a2SYan Zheng if (ptr_gen > last_snapshot) 19205d4f98a2SYan Zheng break; 19215d4f98a2SYan Zheng path->slots[i]++; 19225d4f98a2SYan Zheng } 19235d4f98a2SYan Zheng if (path->slots[i] >= nritems) { 19245d4f98a2SYan Zheng if (i == *level) 19255d4f98a2SYan Zheng break; 19265d4f98a2SYan Zheng *level = i + 1; 19275d4f98a2SYan Zheng return 0; 19285d4f98a2SYan Zheng } 19295d4f98a2SYan Zheng if (i == 1) { 19305d4f98a2SYan Zheng *level = i; 19315d4f98a2SYan Zheng return 0; 19325d4f98a2SYan Zheng } 19335d4f98a2SYan Zheng 19345d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(eb, path->slots[i]); 19355d4f98a2SYan Zheng blocksize = btrfs_level_size(root, i - 1); 19365d4f98a2SYan Zheng eb = read_tree_block(root, bytenr, blocksize, ptr_gen); 1937416bc658SJosef Bacik if (!eb || !extent_buffer_uptodate(eb)) { 1938416bc658SJosef Bacik free_extent_buffer(eb); 1939416bc658SJosef Bacik return -EIO; 1940416bc658SJosef Bacik } 19415d4f98a2SYan Zheng BUG_ON(btrfs_header_level(eb) != i - 1); 19425d4f98a2SYan Zheng path->nodes[i - 1] = eb; 19435d4f98a2SYan Zheng path->slots[i - 1] = 0; 19445d4f98a2SYan Zheng } 19455d4f98a2SYan Zheng return 1; 19465d4f98a2SYan Zheng } 19475d4f98a2SYan Zheng 19485d4f98a2SYan Zheng /* 19495d4f98a2SYan Zheng * invalidate extent cache for file extents whose key in range of 19505d4f98a2SYan Zheng * [min_key, max_key) 19515d4f98a2SYan Zheng */ 19525d4f98a2SYan Zheng static int invalidate_extent_cache(struct btrfs_root *root, 19535d4f98a2SYan Zheng struct btrfs_key *min_key, 19545d4f98a2SYan Zheng struct btrfs_key *max_key) 19555d4f98a2SYan Zheng { 19565d4f98a2SYan Zheng struct inode *inode = NULL; 19575d4f98a2SYan Zheng u64 objectid; 19585d4f98a2SYan Zheng u64 start, end; 195933345d01SLi Zefan u64 ino; 19605d4f98a2SYan Zheng 19615d4f98a2SYan Zheng objectid = min_key->objectid; 19625d4f98a2SYan Zheng while (1) { 19635d4f98a2SYan Zheng cond_resched(); 19645d4f98a2SYan Zheng iput(inode); 19655d4f98a2SYan Zheng 19665d4f98a2SYan Zheng if (objectid > max_key->objectid) 19675d4f98a2SYan Zheng break; 19685d4f98a2SYan Zheng 19695d4f98a2SYan Zheng inode = find_next_inode(root, objectid); 19705d4f98a2SYan Zheng if (!inode) 19715d4f98a2SYan Zheng break; 197233345d01SLi Zefan ino = btrfs_ino(inode); 19735d4f98a2SYan Zheng 197433345d01SLi Zefan if (ino > max_key->objectid) { 19755d4f98a2SYan Zheng iput(inode); 19765d4f98a2SYan Zheng break; 19775d4f98a2SYan Zheng } 19785d4f98a2SYan Zheng 197933345d01SLi Zefan objectid = ino + 1; 19805d4f98a2SYan Zheng if (!S_ISREG(inode->i_mode)) 19815d4f98a2SYan Zheng continue; 19825d4f98a2SYan Zheng 198333345d01SLi Zefan if (unlikely(min_key->objectid == ino)) { 19845d4f98a2SYan Zheng if (min_key->type > BTRFS_EXTENT_DATA_KEY) 19855d4f98a2SYan Zheng continue; 19865d4f98a2SYan Zheng if (min_key->type < BTRFS_EXTENT_DATA_KEY) 19875d4f98a2SYan Zheng start = 0; 19885d4f98a2SYan Zheng else { 19895d4f98a2SYan Zheng start = min_key->offset; 19905d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(start, root->sectorsize)); 19915d4f98a2SYan Zheng } 19925d4f98a2SYan Zheng } else { 19935d4f98a2SYan Zheng start = 0; 19945d4f98a2SYan Zheng } 19955d4f98a2SYan Zheng 199633345d01SLi Zefan if (unlikely(max_key->objectid == ino)) { 19975d4f98a2SYan Zheng if (max_key->type < BTRFS_EXTENT_DATA_KEY) 19985d4f98a2SYan Zheng continue; 19995d4f98a2SYan Zheng if (max_key->type > BTRFS_EXTENT_DATA_KEY) { 20005d4f98a2SYan Zheng end = (u64)-1; 20015d4f98a2SYan Zheng } else { 20025d4f98a2SYan Zheng if (max_key->offset == 0) 20035d4f98a2SYan Zheng continue; 20045d4f98a2SYan Zheng end = max_key->offset; 20055d4f98a2SYan Zheng WARN_ON(!IS_ALIGNED(end, root->sectorsize)); 20065d4f98a2SYan Zheng end--; 20075d4f98a2SYan Zheng } 20085d4f98a2SYan Zheng } else { 20095d4f98a2SYan Zheng end = (u64)-1; 20105d4f98a2SYan Zheng } 20115d4f98a2SYan Zheng 20125d4f98a2SYan Zheng /* the lock_extent waits for readpage to complete */ 2013d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 20145d4f98a2SYan Zheng btrfs_drop_extent_cache(inode, start, end, 1); 2015d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 20165d4f98a2SYan Zheng } 20175d4f98a2SYan Zheng return 0; 20185d4f98a2SYan Zheng } 20195d4f98a2SYan Zheng 20205d4f98a2SYan Zheng static int find_next_key(struct btrfs_path *path, int level, 20215d4f98a2SYan Zheng struct btrfs_key *key) 20225d4f98a2SYan Zheng 20235d4f98a2SYan Zheng { 20245d4f98a2SYan Zheng while (level < BTRFS_MAX_LEVEL) { 20255d4f98a2SYan Zheng if (!path->nodes[level]) 20265d4f98a2SYan Zheng break; 20275d4f98a2SYan Zheng if (path->slots[level] + 1 < 20285d4f98a2SYan Zheng btrfs_header_nritems(path->nodes[level])) { 20295d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], key, 20305d4f98a2SYan Zheng path->slots[level] + 1); 20315d4f98a2SYan Zheng return 0; 20325d4f98a2SYan Zheng } 20335d4f98a2SYan Zheng level++; 20345d4f98a2SYan Zheng } 20355d4f98a2SYan Zheng return 1; 20365d4f98a2SYan Zheng } 20375d4f98a2SYan Zheng 20385d4f98a2SYan Zheng /* 20395d4f98a2SYan Zheng * merge the relocated tree blocks in reloc tree with corresponding 20405d4f98a2SYan Zheng * fs tree. 20415d4f98a2SYan Zheng */ 20425d4f98a2SYan Zheng static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, 20435d4f98a2SYan Zheng struct btrfs_root *root) 20445d4f98a2SYan Zheng { 20455d4f98a2SYan Zheng LIST_HEAD(inode_list); 20465d4f98a2SYan Zheng struct btrfs_key key; 20475d4f98a2SYan Zheng struct btrfs_key next_key; 20485d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 20495d4f98a2SYan Zheng struct btrfs_root *reloc_root; 20505d4f98a2SYan Zheng struct btrfs_root_item *root_item; 20515d4f98a2SYan Zheng struct btrfs_path *path; 20523fd0a558SYan, Zheng struct extent_buffer *leaf; 20535d4f98a2SYan Zheng int level; 20545d4f98a2SYan Zheng int max_level; 20555d4f98a2SYan Zheng int replaced = 0; 20565d4f98a2SYan Zheng int ret; 20575d4f98a2SYan Zheng int err = 0; 20583fd0a558SYan, Zheng u32 min_reserved; 20595d4f98a2SYan Zheng 20605d4f98a2SYan Zheng path = btrfs_alloc_path(); 20615d4f98a2SYan Zheng if (!path) 20625d4f98a2SYan Zheng return -ENOMEM; 2063026fd317SJosef Bacik path->reada = 1; 20645d4f98a2SYan Zheng 20655d4f98a2SYan Zheng reloc_root = root->reloc_root; 20665d4f98a2SYan Zheng root_item = &reloc_root->root_item; 20675d4f98a2SYan Zheng 20685d4f98a2SYan Zheng if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { 20695d4f98a2SYan Zheng level = btrfs_root_level(root_item); 20705d4f98a2SYan Zheng extent_buffer_get(reloc_root->node); 20715d4f98a2SYan Zheng path->nodes[level] = reloc_root->node; 20725d4f98a2SYan Zheng path->slots[level] = 0; 20735d4f98a2SYan Zheng } else { 20745d4f98a2SYan Zheng btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); 20755d4f98a2SYan Zheng 20765d4f98a2SYan Zheng level = root_item->drop_level; 20775d4f98a2SYan Zheng BUG_ON(level == 0); 20785d4f98a2SYan Zheng path->lowest_level = level; 20795d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); 208033c66f43SYan Zheng path->lowest_level = 0; 20815d4f98a2SYan Zheng if (ret < 0) { 20825d4f98a2SYan Zheng btrfs_free_path(path); 20835d4f98a2SYan Zheng return ret; 20845d4f98a2SYan Zheng } 20855d4f98a2SYan Zheng 20865d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &next_key, 20875d4f98a2SYan Zheng path->slots[level]); 20885d4f98a2SYan Zheng WARN_ON(memcmp(&key, &next_key, sizeof(key))); 20895d4f98a2SYan Zheng 20905d4f98a2SYan Zheng btrfs_unlock_up_safe(path, 0); 20915d4f98a2SYan Zheng } 20925d4f98a2SYan Zheng 20933fd0a558SYan, Zheng min_reserved = root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 20945d4f98a2SYan Zheng memset(&next_key, 0, sizeof(next_key)); 20955d4f98a2SYan Zheng 20965d4f98a2SYan Zheng while (1) { 2097a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 209898d5dc13STsutomu Itoh BUG_ON(IS_ERR(trans)); 20993fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 21003fd0a558SYan, Zheng 210108e007d2SMiao Xie ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, 210208e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 21033fd0a558SYan, Zheng if (ret) { 21043fd0a558SYan, Zheng BUG_ON(ret != -EAGAIN); 21053fd0a558SYan, Zheng ret = btrfs_commit_transaction(trans, root); 21063fd0a558SYan, Zheng BUG_ON(ret); 21073fd0a558SYan, Zheng continue; 21083fd0a558SYan, Zheng } 21093fd0a558SYan, Zheng 21103fd0a558SYan, Zheng replaced = 0; 21115d4f98a2SYan Zheng max_level = level; 21125d4f98a2SYan Zheng 21135d4f98a2SYan Zheng ret = walk_down_reloc_tree(reloc_root, path, &level); 21145d4f98a2SYan Zheng if (ret < 0) { 21155d4f98a2SYan Zheng err = ret; 21165d4f98a2SYan Zheng goto out; 21175d4f98a2SYan Zheng } 21185d4f98a2SYan Zheng if (ret > 0) 21195d4f98a2SYan Zheng break; 21205d4f98a2SYan Zheng 21215d4f98a2SYan Zheng if (!find_next_key(path, level, &key) && 21225d4f98a2SYan Zheng btrfs_comp_cpu_keys(&next_key, &key) >= 0) { 21235d4f98a2SYan Zheng ret = 0; 21245d4f98a2SYan Zheng } else { 21253fd0a558SYan, Zheng ret = replace_path(trans, root, reloc_root, path, 21263fd0a558SYan, Zheng &next_key, level, max_level); 21275d4f98a2SYan Zheng } 21285d4f98a2SYan Zheng if (ret < 0) { 21295d4f98a2SYan Zheng err = ret; 21305d4f98a2SYan Zheng goto out; 21315d4f98a2SYan Zheng } 21325d4f98a2SYan Zheng 21335d4f98a2SYan Zheng if (ret > 0) { 21345d4f98a2SYan Zheng level = ret; 21355d4f98a2SYan Zheng btrfs_node_key_to_cpu(path->nodes[level], &key, 21365d4f98a2SYan Zheng path->slots[level]); 21375d4f98a2SYan Zheng replaced = 1; 21385d4f98a2SYan Zheng } 21395d4f98a2SYan Zheng 21405d4f98a2SYan Zheng ret = walk_up_reloc_tree(reloc_root, path, &level); 21415d4f98a2SYan Zheng if (ret > 0) 21425d4f98a2SYan Zheng break; 21435d4f98a2SYan Zheng 21445d4f98a2SYan Zheng BUG_ON(level == 0); 21455d4f98a2SYan Zheng /* 21465d4f98a2SYan Zheng * save the merging progress in the drop_progress. 21475d4f98a2SYan Zheng * this is OK since root refs == 1 in this case. 21485d4f98a2SYan Zheng */ 21495d4f98a2SYan Zheng btrfs_node_key(path->nodes[level], &root_item->drop_progress, 21505d4f98a2SYan Zheng path->slots[level]); 21515d4f98a2SYan Zheng root_item->drop_level = level; 21525d4f98a2SYan Zheng 21533fd0a558SYan, Zheng btrfs_end_transaction_throttle(trans, root); 21545d4f98a2SYan Zheng 2155b53d3f5dSLiu Bo btrfs_btree_balance_dirty(root); 21565d4f98a2SYan Zheng 21575d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 21585d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 21595d4f98a2SYan Zheng } 21605d4f98a2SYan Zheng 21615d4f98a2SYan Zheng /* 21625d4f98a2SYan Zheng * handle the case only one block in the fs tree need to be 21635d4f98a2SYan Zheng * relocated and the block is tree root. 21645d4f98a2SYan Zheng */ 21655d4f98a2SYan Zheng leaf = btrfs_lock_root_node(root); 21665d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); 21675d4f98a2SYan Zheng btrfs_tree_unlock(leaf); 21685d4f98a2SYan Zheng free_extent_buffer(leaf); 21695d4f98a2SYan Zheng if (ret < 0) 21705d4f98a2SYan Zheng err = ret; 21715d4f98a2SYan Zheng out: 21725d4f98a2SYan Zheng btrfs_free_path(path); 21735d4f98a2SYan Zheng 21745d4f98a2SYan Zheng if (err == 0) { 21755d4f98a2SYan Zheng memset(&root_item->drop_progress, 0, 21765d4f98a2SYan Zheng sizeof(root_item->drop_progress)); 21775d4f98a2SYan Zheng root_item->drop_level = 0; 21785d4f98a2SYan Zheng btrfs_set_root_refs(root_item, 0); 21793fd0a558SYan, Zheng btrfs_update_reloc_root(trans, root); 21805d4f98a2SYan Zheng } 21815d4f98a2SYan Zheng 21823fd0a558SYan, Zheng btrfs_end_transaction_throttle(trans, root); 21835d4f98a2SYan Zheng 2184b53d3f5dSLiu Bo btrfs_btree_balance_dirty(root); 21855d4f98a2SYan Zheng 21865d4f98a2SYan Zheng if (replaced && rc->stage == UPDATE_DATA_PTRS) 21875d4f98a2SYan Zheng invalidate_extent_cache(root, &key, &next_key); 21885d4f98a2SYan Zheng 21895d4f98a2SYan Zheng return err; 21905d4f98a2SYan Zheng } 21915d4f98a2SYan Zheng 21923fd0a558SYan, Zheng static noinline_for_stack 21933fd0a558SYan, Zheng int prepare_to_merge(struct reloc_control *rc, int err) 21945d4f98a2SYan Zheng { 21953fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 21963fd0a558SYan, Zheng struct btrfs_root *reloc_root; 21975d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 21983fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 21993fd0a558SYan, Zheng u64 num_bytes = 0; 22003fd0a558SYan, Zheng int ret; 22013fd0a558SYan, Zheng 22027585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 22033fd0a558SYan, Zheng rc->merging_rsv_size += root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; 22043fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated * 2; 22057585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 22067585717fSChris Mason 22073fd0a558SYan, Zheng again: 22083fd0a558SYan, Zheng if (!err) { 22093fd0a558SYan, Zheng num_bytes = rc->merging_rsv_size; 221008e007d2SMiao Xie ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, 221108e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 22123fd0a558SYan, Zheng if (ret) 22133fd0a558SYan, Zheng err = ret; 22143fd0a558SYan, Zheng } 22153fd0a558SYan, Zheng 22167a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 22173612b495STsutomu Itoh if (IS_ERR(trans)) { 22183612b495STsutomu Itoh if (!err) 22193612b495STsutomu Itoh btrfs_block_rsv_release(rc->extent_root, 22203612b495STsutomu Itoh rc->block_rsv, num_bytes); 22213612b495STsutomu Itoh return PTR_ERR(trans); 22223612b495STsutomu Itoh } 22233fd0a558SYan, Zheng 22243fd0a558SYan, Zheng if (!err) { 22253fd0a558SYan, Zheng if (num_bytes != rc->merging_rsv_size) { 22263fd0a558SYan, Zheng btrfs_end_transaction(trans, rc->extent_root); 22273fd0a558SYan, Zheng btrfs_block_rsv_release(rc->extent_root, 22283fd0a558SYan, Zheng rc->block_rsv, num_bytes); 22293fd0a558SYan, Zheng goto again; 22303fd0a558SYan, Zheng } 22313fd0a558SYan, Zheng } 22323fd0a558SYan, Zheng 22333fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 22343fd0a558SYan, Zheng 22353fd0a558SYan, Zheng while (!list_empty(&rc->reloc_roots)) { 22363fd0a558SYan, Zheng reloc_root = list_entry(rc->reloc_roots.next, 22373fd0a558SYan, Zheng struct btrfs_root, root_list); 22383fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 22393fd0a558SYan, Zheng 22403fd0a558SYan, Zheng root = read_fs_root(reloc_root->fs_info, 22413fd0a558SYan, Zheng reloc_root->root_key.offset); 22423fd0a558SYan, Zheng BUG_ON(IS_ERR(root)); 22433fd0a558SYan, Zheng BUG_ON(root->reloc_root != reloc_root); 22443fd0a558SYan, Zheng 22453fd0a558SYan, Zheng /* 22463fd0a558SYan, Zheng * set reference count to 1, so btrfs_recover_relocation 22473fd0a558SYan, Zheng * knows it should resumes merging 22483fd0a558SYan, Zheng */ 22493fd0a558SYan, Zheng if (!err) 22503fd0a558SYan, Zheng btrfs_set_root_refs(&reloc_root->root_item, 1); 22513fd0a558SYan, Zheng btrfs_update_reloc_root(trans, root); 22523fd0a558SYan, Zheng 22533fd0a558SYan, Zheng list_add(&reloc_root->root_list, &reloc_roots); 22543fd0a558SYan, Zheng } 22553fd0a558SYan, Zheng 22563fd0a558SYan, Zheng list_splice(&reloc_roots, &rc->reloc_roots); 22573fd0a558SYan, Zheng 22583fd0a558SYan, Zheng if (!err) 22593fd0a558SYan, Zheng btrfs_commit_transaction(trans, rc->extent_root); 22603fd0a558SYan, Zheng else 22613fd0a558SYan, Zheng btrfs_end_transaction(trans, rc->extent_root); 22623fd0a558SYan, Zheng return err; 22633fd0a558SYan, Zheng } 22643fd0a558SYan, Zheng 22653fd0a558SYan, Zheng static noinline_for_stack 2266aca1bba6SLiu Bo void free_reloc_roots(struct list_head *list) 2267aca1bba6SLiu Bo { 2268aca1bba6SLiu Bo struct btrfs_root *reloc_root; 2269aca1bba6SLiu Bo 2270aca1bba6SLiu Bo while (!list_empty(list)) { 2271aca1bba6SLiu Bo reloc_root = list_entry(list->next, struct btrfs_root, 2272aca1bba6SLiu Bo root_list); 2273aca1bba6SLiu Bo __update_reloc_root(reloc_root, 1); 2274aca1bba6SLiu Bo free_extent_buffer(reloc_root->node); 2275aca1bba6SLiu Bo free_extent_buffer(reloc_root->commit_root); 2276aca1bba6SLiu Bo kfree(reloc_root); 2277aca1bba6SLiu Bo } 2278aca1bba6SLiu Bo } 2279aca1bba6SLiu Bo 2280aca1bba6SLiu Bo static noinline_for_stack 22813fd0a558SYan, Zheng int merge_reloc_roots(struct reloc_control *rc) 22823fd0a558SYan, Zheng { 22835bc7247aSMiao Xie struct btrfs_trans_handle *trans; 22845d4f98a2SYan Zheng struct btrfs_root *root; 22855d4f98a2SYan Zheng struct btrfs_root *reloc_root; 22865bc7247aSMiao Xie u64 last_snap; 22875bc7247aSMiao Xie u64 otransid; 22885bc7247aSMiao Xie u64 objectid; 22893fd0a558SYan, Zheng LIST_HEAD(reloc_roots); 22903fd0a558SYan, Zheng int found = 0; 2291aca1bba6SLiu Bo int ret = 0; 22923fd0a558SYan, Zheng again: 22933fd0a558SYan, Zheng root = rc->extent_root; 22947585717fSChris Mason 22957585717fSChris Mason /* 22967585717fSChris Mason * this serializes us with btrfs_record_root_in_transaction, 22977585717fSChris Mason * we have to make sure nobody is in the middle of 22987585717fSChris Mason * adding their roots to the list while we are 22997585717fSChris Mason * doing this splice 23007585717fSChris Mason */ 23017585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 23023fd0a558SYan, Zheng list_splice_init(&rc->reloc_roots, &reloc_roots); 23037585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 23045d4f98a2SYan Zheng 23053fd0a558SYan, Zheng while (!list_empty(&reloc_roots)) { 23063fd0a558SYan, Zheng found = 1; 23073fd0a558SYan, Zheng reloc_root = list_entry(reloc_roots.next, 23083fd0a558SYan, Zheng struct btrfs_root, root_list); 23095d4f98a2SYan Zheng 23105d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 23115d4f98a2SYan Zheng root = read_fs_root(reloc_root->fs_info, 23125d4f98a2SYan Zheng reloc_root->root_key.offset); 23135d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 23145d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 23155d4f98a2SYan Zheng 23163fd0a558SYan, Zheng ret = merge_reloc_root(rc, root); 2317aca1bba6SLiu Bo if (ret) 2318aca1bba6SLiu Bo goto out; 23193fd0a558SYan, Zheng } else { 23203fd0a558SYan, Zheng list_del_init(&reloc_root->root_list); 23213fd0a558SYan, Zheng } 23225bc7247aSMiao Xie 23235bc7247aSMiao Xie /* 23245bc7247aSMiao Xie * we keep the old last snapshod transid in rtranid when we 23255bc7247aSMiao Xie * created the relocation tree. 23265bc7247aSMiao Xie */ 23275bc7247aSMiao Xie last_snap = btrfs_root_rtransid(&reloc_root->root_item); 23285bc7247aSMiao Xie otransid = btrfs_root_otransid(&reloc_root->root_item); 23295bc7247aSMiao Xie objectid = reloc_root->root_key.offset; 23305bc7247aSMiao Xie 23312c536799SJeff Mahoney ret = btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1); 2332aca1bba6SLiu Bo if (ret < 0) { 2333aca1bba6SLiu Bo if (list_empty(&reloc_root->root_list)) 2334aca1bba6SLiu Bo list_add_tail(&reloc_root->root_list, 2335aca1bba6SLiu Bo &reloc_roots); 2336aca1bba6SLiu Bo goto out; 23375bc7247aSMiao Xie } else if (!ret) { 23385bc7247aSMiao Xie /* 23395bc7247aSMiao Xie * recover the last snapshot tranid to avoid 23405bc7247aSMiao Xie * the space balance break NOCOW. 23415bc7247aSMiao Xie */ 23425bc7247aSMiao Xie root = read_fs_root(rc->extent_root->fs_info, 23435bc7247aSMiao Xie objectid); 23445bc7247aSMiao Xie if (IS_ERR(root)) 23455bc7247aSMiao Xie continue; 23465bc7247aSMiao Xie 23475bc7247aSMiao Xie if (btrfs_root_refs(&root->root_item) == 0) 23485bc7247aSMiao Xie continue; 23495bc7247aSMiao Xie 23505bc7247aSMiao Xie trans = btrfs_join_transaction(root); 23515bc7247aSMiao Xie BUG_ON(IS_ERR(trans)); 23525bc7247aSMiao Xie 23535bc7247aSMiao Xie /* Check if the fs/file tree was snapshoted or not. */ 23545bc7247aSMiao Xie if (btrfs_root_last_snapshot(&root->root_item) == 23555bc7247aSMiao Xie otransid - 1) 23565bc7247aSMiao Xie btrfs_set_root_last_snapshot(&root->root_item, 23575bc7247aSMiao Xie last_snap); 23585bc7247aSMiao Xie 23595bc7247aSMiao Xie btrfs_end_transaction(trans, root); 2360aca1bba6SLiu Bo } 23615d4f98a2SYan Zheng } 23625d4f98a2SYan Zheng 23633fd0a558SYan, Zheng if (found) { 23643fd0a558SYan, Zheng found = 0; 23653fd0a558SYan, Zheng goto again; 23665d4f98a2SYan Zheng } 2367aca1bba6SLiu Bo out: 2368aca1bba6SLiu Bo if (ret) { 2369aca1bba6SLiu Bo btrfs_std_error(root->fs_info, ret); 2370aca1bba6SLiu Bo if (!list_empty(&reloc_roots)) 2371aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 2372aca1bba6SLiu Bo } 2373aca1bba6SLiu Bo 23745d4f98a2SYan Zheng BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); 2375aca1bba6SLiu Bo return ret; 23765d4f98a2SYan Zheng } 23775d4f98a2SYan Zheng 23785d4f98a2SYan Zheng static void free_block_list(struct rb_root *blocks) 23795d4f98a2SYan Zheng { 23805d4f98a2SYan Zheng struct tree_block *block; 23815d4f98a2SYan Zheng struct rb_node *rb_node; 23825d4f98a2SYan Zheng while ((rb_node = rb_first(blocks))) { 23835d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 23845d4f98a2SYan Zheng rb_erase(rb_node, blocks); 23855d4f98a2SYan Zheng kfree(block); 23865d4f98a2SYan Zheng } 23875d4f98a2SYan Zheng } 23885d4f98a2SYan Zheng 23895d4f98a2SYan Zheng static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, 23905d4f98a2SYan Zheng struct btrfs_root *reloc_root) 23915d4f98a2SYan Zheng { 23925d4f98a2SYan Zheng struct btrfs_root *root; 23935d4f98a2SYan Zheng 23945d4f98a2SYan Zheng if (reloc_root->last_trans == trans->transid) 23955d4f98a2SYan Zheng return 0; 23965d4f98a2SYan Zheng 23975d4f98a2SYan Zheng root = read_fs_root(reloc_root->fs_info, reloc_root->root_key.offset); 23985d4f98a2SYan Zheng BUG_ON(IS_ERR(root)); 23995d4f98a2SYan Zheng BUG_ON(root->reloc_root != reloc_root); 24005d4f98a2SYan Zheng 24015d4f98a2SYan Zheng return btrfs_record_root_in_trans(trans, root); 24025d4f98a2SYan Zheng } 24035d4f98a2SYan Zheng 24043fd0a558SYan, Zheng static noinline_for_stack 24053fd0a558SYan, Zheng struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, 24063fd0a558SYan, Zheng struct reloc_control *rc, 24075d4f98a2SYan Zheng struct backref_node *node, 24083fd0a558SYan, Zheng struct backref_edge *edges[], int *nr) 24095d4f98a2SYan Zheng { 24105d4f98a2SYan Zheng struct backref_node *next; 24115d4f98a2SYan Zheng struct btrfs_root *root; 24123fd0a558SYan, Zheng int index = 0; 24133fd0a558SYan, Zheng 24145d4f98a2SYan Zheng next = node; 24155d4f98a2SYan Zheng while (1) { 24165d4f98a2SYan Zheng cond_resched(); 24175d4f98a2SYan Zheng next = walk_up_backref(next, edges, &index); 24185d4f98a2SYan Zheng root = next->root; 24193fd0a558SYan, Zheng BUG_ON(!root); 24203fd0a558SYan, Zheng BUG_ON(!root->ref_cows); 24215d4f98a2SYan Zheng 24225d4f98a2SYan Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { 24235d4f98a2SYan Zheng record_reloc_root_in_trans(trans, root); 24245d4f98a2SYan Zheng break; 24255d4f98a2SYan Zheng } 24265d4f98a2SYan Zheng 24275d4f98a2SYan Zheng btrfs_record_root_in_trans(trans, root); 24283fd0a558SYan, Zheng root = root->reloc_root; 24293fd0a558SYan, Zheng 24303fd0a558SYan, Zheng if (next->new_bytenr != root->node->start) { 24313fd0a558SYan, Zheng BUG_ON(next->new_bytenr); 24323fd0a558SYan, Zheng BUG_ON(!list_empty(&next->list)); 24333fd0a558SYan, Zheng next->new_bytenr = root->node->start; 24343fd0a558SYan, Zheng next->root = root; 24353fd0a558SYan, Zheng list_add_tail(&next->list, 24363fd0a558SYan, Zheng &rc->backref_cache.changed); 24373fd0a558SYan, Zheng __mark_block_processed(rc, next); 24385d4f98a2SYan Zheng break; 24395d4f98a2SYan Zheng } 24405d4f98a2SYan Zheng 24413fd0a558SYan, Zheng WARN_ON(1); 24425d4f98a2SYan Zheng root = NULL; 24435d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 24445d4f98a2SYan Zheng if (!next || next->level <= node->level) 24455d4f98a2SYan Zheng break; 24465d4f98a2SYan Zheng } 24473fd0a558SYan, Zheng if (!root) 24483fd0a558SYan, Zheng return NULL; 24495d4f98a2SYan Zheng 24505d4f98a2SYan Zheng *nr = index; 24513fd0a558SYan, Zheng next = node; 24523fd0a558SYan, Zheng /* setup backref node path for btrfs_reloc_cow_block */ 24533fd0a558SYan, Zheng while (1) { 24543fd0a558SYan, Zheng rc->backref_cache.path[next->level] = next; 24553fd0a558SYan, Zheng if (--index < 0) 24563fd0a558SYan, Zheng break; 24573fd0a558SYan, Zheng next = edges[index]->node[UPPER]; 24583fd0a558SYan, Zheng } 24595d4f98a2SYan Zheng return root; 24605d4f98a2SYan Zheng } 24615d4f98a2SYan Zheng 24623fd0a558SYan, Zheng /* 24633fd0a558SYan, Zheng * select a tree root for relocation. return NULL if the block 24643fd0a558SYan, Zheng * is reference counted. we should use do_relocation() in this 24653fd0a558SYan, Zheng * case. return a tree root pointer if the block isn't reference 24663fd0a558SYan, Zheng * counted. return -ENOENT if the block is root of reloc tree. 24673fd0a558SYan, Zheng */ 24685d4f98a2SYan Zheng static noinline_for_stack 24695d4f98a2SYan Zheng struct btrfs_root *select_one_root(struct btrfs_trans_handle *trans, 24705d4f98a2SYan Zheng struct backref_node *node) 24715d4f98a2SYan Zheng { 24723fd0a558SYan, Zheng struct backref_node *next; 24733fd0a558SYan, Zheng struct btrfs_root *root; 24743fd0a558SYan, Zheng struct btrfs_root *fs_root = NULL; 24755d4f98a2SYan Zheng struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 24763fd0a558SYan, Zheng int index = 0; 24773fd0a558SYan, Zheng 24783fd0a558SYan, Zheng next = node; 24793fd0a558SYan, Zheng while (1) { 24803fd0a558SYan, Zheng cond_resched(); 24813fd0a558SYan, Zheng next = walk_up_backref(next, edges, &index); 24823fd0a558SYan, Zheng root = next->root; 24833fd0a558SYan, Zheng BUG_ON(!root); 24843fd0a558SYan, Zheng 248525985edcSLucas De Marchi /* no other choice for non-references counted tree */ 24863fd0a558SYan, Zheng if (!root->ref_cows) 24873fd0a558SYan, Zheng return root; 24883fd0a558SYan, Zheng 24893fd0a558SYan, Zheng if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) 24903fd0a558SYan, Zheng fs_root = root; 24913fd0a558SYan, Zheng 24923fd0a558SYan, Zheng if (next != node) 24933fd0a558SYan, Zheng return NULL; 24943fd0a558SYan, Zheng 24953fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 24963fd0a558SYan, Zheng if (!next || next->level <= node->level) 24973fd0a558SYan, Zheng break; 24983fd0a558SYan, Zheng } 24993fd0a558SYan, Zheng 25003fd0a558SYan, Zheng if (!fs_root) 25013fd0a558SYan, Zheng return ERR_PTR(-ENOENT); 25023fd0a558SYan, Zheng return fs_root; 25035d4f98a2SYan Zheng } 25045d4f98a2SYan Zheng 25055d4f98a2SYan Zheng static noinline_for_stack 25063fd0a558SYan, Zheng u64 calcu_metadata_size(struct reloc_control *rc, 25073fd0a558SYan, Zheng struct backref_node *node, int reserve) 25085d4f98a2SYan Zheng { 25093fd0a558SYan, Zheng struct backref_node *next = node; 25103fd0a558SYan, Zheng struct backref_edge *edge; 25113fd0a558SYan, Zheng struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 25123fd0a558SYan, Zheng u64 num_bytes = 0; 25133fd0a558SYan, Zheng int index = 0; 25145d4f98a2SYan Zheng 25153fd0a558SYan, Zheng BUG_ON(reserve && node->processed); 25163fd0a558SYan, Zheng 25173fd0a558SYan, Zheng while (next) { 25183fd0a558SYan, Zheng cond_resched(); 25195d4f98a2SYan Zheng while (1) { 25203fd0a558SYan, Zheng if (next->processed && (reserve || next != node)) 25215d4f98a2SYan Zheng break; 25225d4f98a2SYan Zheng 25233fd0a558SYan, Zheng num_bytes += btrfs_level_size(rc->extent_root, 25243fd0a558SYan, Zheng next->level); 25253fd0a558SYan, Zheng 25263fd0a558SYan, Zheng if (list_empty(&next->upper)) 25273fd0a558SYan, Zheng break; 25283fd0a558SYan, Zheng 25293fd0a558SYan, Zheng edge = list_entry(next->upper.next, 25303fd0a558SYan, Zheng struct backref_edge, list[LOWER]); 25313fd0a558SYan, Zheng edges[index++] = edge; 25323fd0a558SYan, Zheng next = edge->node[UPPER]; 25335d4f98a2SYan Zheng } 25343fd0a558SYan, Zheng next = walk_down_backref(edges, &index); 25353fd0a558SYan, Zheng } 25363fd0a558SYan, Zheng return num_bytes; 25373fd0a558SYan, Zheng } 25383fd0a558SYan, Zheng 25393fd0a558SYan, Zheng static int reserve_metadata_space(struct btrfs_trans_handle *trans, 25403fd0a558SYan, Zheng struct reloc_control *rc, 25413fd0a558SYan, Zheng struct backref_node *node) 25423fd0a558SYan, Zheng { 25433fd0a558SYan, Zheng struct btrfs_root *root = rc->extent_root; 25443fd0a558SYan, Zheng u64 num_bytes; 25453fd0a558SYan, Zheng int ret; 25463fd0a558SYan, Zheng 25473fd0a558SYan, Zheng num_bytes = calcu_metadata_size(rc, node, 1) * 2; 25483fd0a558SYan, Zheng 25493fd0a558SYan, Zheng trans->block_rsv = rc->block_rsv; 255008e007d2SMiao Xie ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, 255108e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 25523fd0a558SYan, Zheng if (ret) { 25533fd0a558SYan, Zheng if (ret == -EAGAIN) 25543fd0a558SYan, Zheng rc->commit_transaction = 1; 25553fd0a558SYan, Zheng return ret; 25563fd0a558SYan, Zheng } 25573fd0a558SYan, Zheng 25583fd0a558SYan, Zheng return 0; 25593fd0a558SYan, Zheng } 25603fd0a558SYan, Zheng 25613fd0a558SYan, Zheng static void release_metadata_space(struct reloc_control *rc, 25623fd0a558SYan, Zheng struct backref_node *node) 25633fd0a558SYan, Zheng { 25643fd0a558SYan, Zheng u64 num_bytes = calcu_metadata_size(rc, node, 0) * 2; 25653fd0a558SYan, Zheng btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, num_bytes); 25665d4f98a2SYan Zheng } 25675d4f98a2SYan Zheng 25685d4f98a2SYan Zheng /* 25695d4f98a2SYan Zheng * relocate a block tree, and then update pointers in upper level 25705d4f98a2SYan Zheng * blocks that reference the block to point to the new location. 25715d4f98a2SYan Zheng * 25725d4f98a2SYan Zheng * if called by link_to_upper, the block has already been relocated. 25735d4f98a2SYan Zheng * in that case this function just updates pointers. 25745d4f98a2SYan Zheng */ 25755d4f98a2SYan Zheng static int do_relocation(struct btrfs_trans_handle *trans, 25763fd0a558SYan, Zheng struct reloc_control *rc, 25775d4f98a2SYan Zheng struct backref_node *node, 25785d4f98a2SYan Zheng struct btrfs_key *key, 25795d4f98a2SYan Zheng struct btrfs_path *path, int lowest) 25805d4f98a2SYan Zheng { 25815d4f98a2SYan Zheng struct backref_node *upper; 25825d4f98a2SYan Zheng struct backref_edge *edge; 25835d4f98a2SYan Zheng struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 25845d4f98a2SYan Zheng struct btrfs_root *root; 25855d4f98a2SYan Zheng struct extent_buffer *eb; 25865d4f98a2SYan Zheng u32 blocksize; 25875d4f98a2SYan Zheng u64 bytenr; 25885d4f98a2SYan Zheng u64 generation; 25895d4f98a2SYan Zheng int nr; 25905d4f98a2SYan Zheng int slot; 25915d4f98a2SYan Zheng int ret; 25925d4f98a2SYan Zheng int err = 0; 25935d4f98a2SYan Zheng 25945d4f98a2SYan Zheng BUG_ON(lowest && node->eb); 25955d4f98a2SYan Zheng 25965d4f98a2SYan Zheng path->lowest_level = node->level + 1; 25973fd0a558SYan, Zheng rc->backref_cache.path[node->level] = node; 25985d4f98a2SYan Zheng list_for_each_entry(edge, &node->upper, list[LOWER]) { 25995d4f98a2SYan Zheng cond_resched(); 26005d4f98a2SYan Zheng 26015d4f98a2SYan Zheng upper = edge->node[UPPER]; 26023fd0a558SYan, Zheng root = select_reloc_root(trans, rc, upper, edges, &nr); 26033fd0a558SYan, Zheng BUG_ON(!root); 26045d4f98a2SYan Zheng 26053fd0a558SYan, Zheng if (upper->eb && !upper->locked) { 26063fd0a558SYan, Zheng if (!lowest) { 26073fd0a558SYan, Zheng ret = btrfs_bin_search(upper->eb, key, 26083fd0a558SYan, Zheng upper->level, &slot); 26093fd0a558SYan, Zheng BUG_ON(ret); 26103fd0a558SYan, Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 26113fd0a558SYan, Zheng if (node->eb->start == bytenr) 26123fd0a558SYan, Zheng goto next; 26133fd0a558SYan, Zheng } 26145d4f98a2SYan Zheng drop_node_buffer(upper); 26153fd0a558SYan, Zheng } 26165d4f98a2SYan Zheng 26175d4f98a2SYan Zheng if (!upper->eb) { 26185d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 26195d4f98a2SYan Zheng if (ret < 0) { 26205d4f98a2SYan Zheng err = ret; 26215d4f98a2SYan Zheng break; 26225d4f98a2SYan Zheng } 26235d4f98a2SYan Zheng BUG_ON(ret > 0); 26245d4f98a2SYan Zheng 26253fd0a558SYan, Zheng if (!upper->eb) { 26263fd0a558SYan, Zheng upper->eb = path->nodes[upper->level]; 26273fd0a558SYan, Zheng path->nodes[upper->level] = NULL; 26283fd0a558SYan, Zheng } else { 26293fd0a558SYan, Zheng BUG_ON(upper->eb != path->nodes[upper->level]); 26303fd0a558SYan, Zheng } 26313fd0a558SYan, Zheng 26323fd0a558SYan, Zheng upper->locked = 1; 26333fd0a558SYan, Zheng path->locks[upper->level] = 0; 26343fd0a558SYan, Zheng 26355d4f98a2SYan Zheng slot = path->slots[upper->level]; 2636b3b4aa74SDavid Sterba btrfs_release_path(path); 26375d4f98a2SYan Zheng } else { 26385d4f98a2SYan Zheng ret = btrfs_bin_search(upper->eb, key, upper->level, 26395d4f98a2SYan Zheng &slot); 26405d4f98a2SYan Zheng BUG_ON(ret); 26415d4f98a2SYan Zheng } 26425d4f98a2SYan Zheng 26435d4f98a2SYan Zheng bytenr = btrfs_node_blockptr(upper->eb, slot); 26443fd0a558SYan, Zheng if (lowest) { 26453fd0a558SYan, Zheng BUG_ON(bytenr != node->bytenr); 26465d4f98a2SYan Zheng } else { 26473fd0a558SYan, Zheng if (node->eb->start == bytenr) 26483fd0a558SYan, Zheng goto next; 26495d4f98a2SYan Zheng } 26505d4f98a2SYan Zheng 26515d4f98a2SYan Zheng blocksize = btrfs_level_size(root, node->level); 26525d4f98a2SYan Zheng generation = btrfs_node_ptr_generation(upper->eb, slot); 26535d4f98a2SYan Zheng eb = read_tree_block(root, bytenr, blocksize, generation); 2654416bc658SJosef Bacik if (!eb || !extent_buffer_uptodate(eb)) { 2655416bc658SJosef Bacik free_extent_buffer(eb); 265697d9a8a4STsutomu Itoh err = -EIO; 265797d9a8a4STsutomu Itoh goto next; 265897d9a8a4STsutomu Itoh } 26595d4f98a2SYan Zheng btrfs_tree_lock(eb); 26605d4f98a2SYan Zheng btrfs_set_lock_blocking(eb); 26615d4f98a2SYan Zheng 26625d4f98a2SYan Zheng if (!node->eb) { 26635d4f98a2SYan Zheng ret = btrfs_cow_block(trans, root, eb, upper->eb, 26645d4f98a2SYan Zheng slot, &eb); 26653fd0a558SYan, Zheng btrfs_tree_unlock(eb); 26663fd0a558SYan, Zheng free_extent_buffer(eb); 26675d4f98a2SYan Zheng if (ret < 0) { 26685d4f98a2SYan Zheng err = ret; 26693fd0a558SYan, Zheng goto next; 26705d4f98a2SYan Zheng } 26713fd0a558SYan, Zheng BUG_ON(node->eb != eb); 26725d4f98a2SYan Zheng } else { 26735d4f98a2SYan Zheng btrfs_set_node_blockptr(upper->eb, slot, 26745d4f98a2SYan Zheng node->eb->start); 26755d4f98a2SYan Zheng btrfs_set_node_ptr_generation(upper->eb, slot, 26765d4f98a2SYan Zheng trans->transid); 26775d4f98a2SYan Zheng btrfs_mark_buffer_dirty(upper->eb); 26785d4f98a2SYan Zheng 26795d4f98a2SYan Zheng ret = btrfs_inc_extent_ref(trans, root, 26805d4f98a2SYan Zheng node->eb->start, blocksize, 26815d4f98a2SYan Zheng upper->eb->start, 26825d4f98a2SYan Zheng btrfs_header_owner(upper->eb), 268366d7e7f0SArne Jansen node->level, 0, 1); 26845d4f98a2SYan Zheng BUG_ON(ret); 26855d4f98a2SYan Zheng 26865d4f98a2SYan Zheng ret = btrfs_drop_subtree(trans, root, eb, upper->eb); 26875d4f98a2SYan Zheng BUG_ON(ret); 26885d4f98a2SYan Zheng } 26893fd0a558SYan, Zheng next: 26903fd0a558SYan, Zheng if (!upper->pending) 26913fd0a558SYan, Zheng drop_node_buffer(upper); 26923fd0a558SYan, Zheng else 26933fd0a558SYan, Zheng unlock_node_buffer(upper); 26943fd0a558SYan, Zheng if (err) 26953fd0a558SYan, Zheng break; 26965d4f98a2SYan Zheng } 26973fd0a558SYan, Zheng 26983fd0a558SYan, Zheng if (!err && node->pending) { 26993fd0a558SYan, Zheng drop_node_buffer(node); 27003fd0a558SYan, Zheng list_move_tail(&node->list, &rc->backref_cache.changed); 27013fd0a558SYan, Zheng node->pending = 0; 27025d4f98a2SYan Zheng } 27033fd0a558SYan, Zheng 27045d4f98a2SYan Zheng path->lowest_level = 0; 27053fd0a558SYan, Zheng BUG_ON(err == -ENOSPC); 27065d4f98a2SYan Zheng return err; 27075d4f98a2SYan Zheng } 27085d4f98a2SYan Zheng 27095d4f98a2SYan Zheng static int link_to_upper(struct btrfs_trans_handle *trans, 27103fd0a558SYan, Zheng struct reloc_control *rc, 27115d4f98a2SYan Zheng struct backref_node *node, 27125d4f98a2SYan Zheng struct btrfs_path *path) 27135d4f98a2SYan Zheng { 27145d4f98a2SYan Zheng struct btrfs_key key; 27155d4f98a2SYan Zheng 27165d4f98a2SYan Zheng btrfs_node_key_to_cpu(node->eb, &key, 0); 27173fd0a558SYan, Zheng return do_relocation(trans, rc, node, &key, path, 0); 27185d4f98a2SYan Zheng } 27195d4f98a2SYan Zheng 27205d4f98a2SYan Zheng static int finish_pending_nodes(struct btrfs_trans_handle *trans, 27213fd0a558SYan, Zheng struct reloc_control *rc, 27223fd0a558SYan, Zheng struct btrfs_path *path, int err) 27235d4f98a2SYan Zheng { 27243fd0a558SYan, Zheng LIST_HEAD(list); 27253fd0a558SYan, Zheng struct backref_cache *cache = &rc->backref_cache; 27265d4f98a2SYan Zheng struct backref_node *node; 27275d4f98a2SYan Zheng int level; 27285d4f98a2SYan Zheng int ret; 27295d4f98a2SYan Zheng 27305d4f98a2SYan Zheng for (level = 0; level < BTRFS_MAX_LEVEL; level++) { 27315d4f98a2SYan Zheng while (!list_empty(&cache->pending[level])) { 27325d4f98a2SYan Zheng node = list_entry(cache->pending[level].next, 27333fd0a558SYan, Zheng struct backref_node, list); 27343fd0a558SYan, Zheng list_move_tail(&node->list, &list); 27353fd0a558SYan, Zheng BUG_ON(!node->pending); 27365d4f98a2SYan Zheng 27373fd0a558SYan, Zheng if (!err) { 27383fd0a558SYan, Zheng ret = link_to_upper(trans, rc, node, path); 27395d4f98a2SYan Zheng if (ret < 0) 27405d4f98a2SYan Zheng err = ret; 27415d4f98a2SYan Zheng } 27425d4f98a2SYan Zheng } 27433fd0a558SYan, Zheng list_splice_init(&list, &cache->pending[level]); 27443fd0a558SYan, Zheng } 27455d4f98a2SYan Zheng return err; 27465d4f98a2SYan Zheng } 27475d4f98a2SYan Zheng 27485d4f98a2SYan Zheng static void mark_block_processed(struct reloc_control *rc, 27493fd0a558SYan, Zheng u64 bytenr, u32 blocksize) 27503fd0a558SYan, Zheng { 27513fd0a558SYan, Zheng set_extent_bits(&rc->processed_blocks, bytenr, bytenr + blocksize - 1, 27523fd0a558SYan, Zheng EXTENT_DIRTY, GFP_NOFS); 27533fd0a558SYan, Zheng } 27543fd0a558SYan, Zheng 27553fd0a558SYan, Zheng static void __mark_block_processed(struct reloc_control *rc, 27565d4f98a2SYan Zheng struct backref_node *node) 27575d4f98a2SYan Zheng { 27585d4f98a2SYan Zheng u32 blocksize; 27595d4f98a2SYan Zheng if (node->level == 0 || 27605d4f98a2SYan Zheng in_block_group(node->bytenr, rc->block_group)) { 27615d4f98a2SYan Zheng blocksize = btrfs_level_size(rc->extent_root, node->level); 27623fd0a558SYan, Zheng mark_block_processed(rc, node->bytenr, blocksize); 27635d4f98a2SYan Zheng } 27645d4f98a2SYan Zheng node->processed = 1; 27655d4f98a2SYan Zheng } 27665d4f98a2SYan Zheng 27675d4f98a2SYan Zheng /* 27685d4f98a2SYan Zheng * mark a block and all blocks directly/indirectly reference the block 27695d4f98a2SYan Zheng * as processed. 27705d4f98a2SYan Zheng */ 27715d4f98a2SYan Zheng static void update_processed_blocks(struct reloc_control *rc, 27725d4f98a2SYan Zheng struct backref_node *node) 27735d4f98a2SYan Zheng { 27745d4f98a2SYan Zheng struct backref_node *next = node; 27755d4f98a2SYan Zheng struct backref_edge *edge; 27765d4f98a2SYan Zheng struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; 27775d4f98a2SYan Zheng int index = 0; 27785d4f98a2SYan Zheng 27795d4f98a2SYan Zheng while (next) { 27805d4f98a2SYan Zheng cond_resched(); 27815d4f98a2SYan Zheng while (1) { 27825d4f98a2SYan Zheng if (next->processed) 27835d4f98a2SYan Zheng break; 27845d4f98a2SYan Zheng 27853fd0a558SYan, Zheng __mark_block_processed(rc, next); 27865d4f98a2SYan Zheng 27875d4f98a2SYan Zheng if (list_empty(&next->upper)) 27885d4f98a2SYan Zheng break; 27895d4f98a2SYan Zheng 27905d4f98a2SYan Zheng edge = list_entry(next->upper.next, 27915d4f98a2SYan Zheng struct backref_edge, list[LOWER]); 27925d4f98a2SYan Zheng edges[index++] = edge; 27935d4f98a2SYan Zheng next = edge->node[UPPER]; 27945d4f98a2SYan Zheng } 27955d4f98a2SYan Zheng next = walk_down_backref(edges, &index); 27965d4f98a2SYan Zheng } 27975d4f98a2SYan Zheng } 27985d4f98a2SYan Zheng 27995d4f98a2SYan Zheng static int tree_block_processed(u64 bytenr, u32 blocksize, 28005d4f98a2SYan Zheng struct reloc_control *rc) 28015d4f98a2SYan Zheng { 28025d4f98a2SYan Zheng if (test_range_bit(&rc->processed_blocks, bytenr, 28039655d298SChris Mason bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) 28045d4f98a2SYan Zheng return 1; 28055d4f98a2SYan Zheng return 0; 28065d4f98a2SYan Zheng } 28075d4f98a2SYan Zheng 28085d4f98a2SYan Zheng static int get_tree_block_key(struct reloc_control *rc, 28095d4f98a2SYan Zheng struct tree_block *block) 28105d4f98a2SYan Zheng { 28115d4f98a2SYan Zheng struct extent_buffer *eb; 28125d4f98a2SYan Zheng 28135d4f98a2SYan Zheng BUG_ON(block->key_ready); 28145d4f98a2SYan Zheng eb = read_tree_block(rc->extent_root, block->bytenr, 28155d4f98a2SYan Zheng block->key.objectid, block->key.offset); 2816416bc658SJosef Bacik if (!eb || !extent_buffer_uptodate(eb)) { 2817416bc658SJosef Bacik free_extent_buffer(eb); 2818416bc658SJosef Bacik return -EIO; 2819416bc658SJosef Bacik } 28205d4f98a2SYan Zheng WARN_ON(btrfs_header_level(eb) != block->level); 28215d4f98a2SYan Zheng if (block->level == 0) 28225d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &block->key, 0); 28235d4f98a2SYan Zheng else 28245d4f98a2SYan Zheng btrfs_node_key_to_cpu(eb, &block->key, 0); 28255d4f98a2SYan Zheng free_extent_buffer(eb); 28265d4f98a2SYan Zheng block->key_ready = 1; 28275d4f98a2SYan Zheng return 0; 28285d4f98a2SYan Zheng } 28295d4f98a2SYan Zheng 28305d4f98a2SYan Zheng static int reada_tree_block(struct reloc_control *rc, 28315d4f98a2SYan Zheng struct tree_block *block) 28325d4f98a2SYan Zheng { 28335d4f98a2SYan Zheng BUG_ON(block->key_ready); 28343173a18fSJosef Bacik if (block->key.type == BTRFS_METADATA_ITEM_KEY) 28353173a18fSJosef Bacik readahead_tree_block(rc->extent_root, block->bytenr, 28363173a18fSJosef Bacik block->key.objectid, 28373173a18fSJosef Bacik rc->extent_root->leafsize); 28383173a18fSJosef Bacik else 28395d4f98a2SYan Zheng readahead_tree_block(rc->extent_root, block->bytenr, 28405d4f98a2SYan Zheng block->key.objectid, block->key.offset); 28415d4f98a2SYan Zheng return 0; 28425d4f98a2SYan Zheng } 28435d4f98a2SYan Zheng 28445d4f98a2SYan Zheng /* 28455d4f98a2SYan Zheng * helper function to relocate a tree block 28465d4f98a2SYan Zheng */ 28475d4f98a2SYan Zheng static int relocate_tree_block(struct btrfs_trans_handle *trans, 28485d4f98a2SYan Zheng struct reloc_control *rc, 28495d4f98a2SYan Zheng struct backref_node *node, 28505d4f98a2SYan Zheng struct btrfs_key *key, 28515d4f98a2SYan Zheng struct btrfs_path *path) 28525d4f98a2SYan Zheng { 28535d4f98a2SYan Zheng struct btrfs_root *root; 28543fd0a558SYan, Zheng int release = 0; 28553fd0a558SYan, Zheng int ret = 0; 28565d4f98a2SYan Zheng 28573fd0a558SYan, Zheng if (!node) 28585d4f98a2SYan Zheng return 0; 28593fd0a558SYan, Zheng 28603fd0a558SYan, Zheng BUG_ON(node->processed); 28613fd0a558SYan, Zheng root = select_one_root(trans, node); 28623fd0a558SYan, Zheng if (root == ERR_PTR(-ENOENT)) { 28633fd0a558SYan, Zheng update_processed_blocks(rc, node); 28643fd0a558SYan, Zheng goto out; 28655d4f98a2SYan Zheng } 28665d4f98a2SYan Zheng 28673fd0a558SYan, Zheng if (!root || root->ref_cows) { 28683fd0a558SYan, Zheng ret = reserve_metadata_space(trans, rc, node); 28693fd0a558SYan, Zheng if (ret) 28705d4f98a2SYan Zheng goto out; 28713fd0a558SYan, Zheng release = 1; 28725d4f98a2SYan Zheng } 28733fd0a558SYan, Zheng 28743fd0a558SYan, Zheng if (root) { 28753fd0a558SYan, Zheng if (root->ref_cows) { 28763fd0a558SYan, Zheng BUG_ON(node->new_bytenr); 28773fd0a558SYan, Zheng BUG_ON(!list_empty(&node->list)); 28783fd0a558SYan, Zheng btrfs_record_root_in_trans(trans, root); 28793fd0a558SYan, Zheng root = root->reloc_root; 28803fd0a558SYan, Zheng node->new_bytenr = root->node->start; 28813fd0a558SYan, Zheng node->root = root; 28823fd0a558SYan, Zheng list_add_tail(&node->list, &rc->backref_cache.changed); 28833fd0a558SYan, Zheng } else { 28845d4f98a2SYan Zheng path->lowest_level = node->level; 28855d4f98a2SYan Zheng ret = btrfs_search_slot(trans, root, key, path, 0, 1); 2886b3b4aa74SDavid Sterba btrfs_release_path(path); 28873fd0a558SYan, Zheng if (ret > 0) 28885d4f98a2SYan Zheng ret = 0; 28893fd0a558SYan, Zheng } 28903fd0a558SYan, Zheng if (!ret) 28913fd0a558SYan, Zheng update_processed_blocks(rc, node); 28923fd0a558SYan, Zheng } else { 28933fd0a558SYan, Zheng ret = do_relocation(trans, rc, node, key, path, 1); 28943fd0a558SYan, Zheng } 28955d4f98a2SYan Zheng out: 28963fd0a558SYan, Zheng if (ret || node->level == 0 || node->cowonly) { 28973fd0a558SYan, Zheng if (release) 28983fd0a558SYan, Zheng release_metadata_space(rc, node); 28993fd0a558SYan, Zheng remove_backref_node(&rc->backref_cache, node); 29003fd0a558SYan, Zheng } 29015d4f98a2SYan Zheng return ret; 29025d4f98a2SYan Zheng } 29035d4f98a2SYan Zheng 29045d4f98a2SYan Zheng /* 29055d4f98a2SYan Zheng * relocate a list of blocks 29065d4f98a2SYan Zheng */ 29075d4f98a2SYan Zheng static noinline_for_stack 29085d4f98a2SYan Zheng int relocate_tree_blocks(struct btrfs_trans_handle *trans, 29095d4f98a2SYan Zheng struct reloc_control *rc, struct rb_root *blocks) 29105d4f98a2SYan Zheng { 29115d4f98a2SYan Zheng struct backref_node *node; 29125d4f98a2SYan Zheng struct btrfs_path *path; 29135d4f98a2SYan Zheng struct tree_block *block; 29145d4f98a2SYan Zheng struct rb_node *rb_node; 29155d4f98a2SYan Zheng int ret; 29165d4f98a2SYan Zheng int err = 0; 29175d4f98a2SYan Zheng 29185d4f98a2SYan Zheng path = btrfs_alloc_path(); 2919e1a12670SLiu Bo if (!path) { 2920e1a12670SLiu Bo err = -ENOMEM; 292134c2b290SDavid Sterba goto out_free_blocks; 2922e1a12670SLiu Bo } 29235d4f98a2SYan Zheng 29245d4f98a2SYan Zheng rb_node = rb_first(blocks); 29255d4f98a2SYan Zheng while (rb_node) { 29265d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 29275d4f98a2SYan Zheng if (!block->key_ready) 29285d4f98a2SYan Zheng reada_tree_block(rc, block); 29295d4f98a2SYan Zheng rb_node = rb_next(rb_node); 29305d4f98a2SYan Zheng } 29315d4f98a2SYan Zheng 29325d4f98a2SYan Zheng rb_node = rb_first(blocks); 29335d4f98a2SYan Zheng while (rb_node) { 29345d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 293534c2b290SDavid Sterba if (!block->key_ready) { 293634c2b290SDavid Sterba err = get_tree_block_key(rc, block); 293734c2b290SDavid Sterba if (err) 293834c2b290SDavid Sterba goto out_free_path; 293934c2b290SDavid Sterba } 29405d4f98a2SYan Zheng rb_node = rb_next(rb_node); 29415d4f98a2SYan Zheng } 29425d4f98a2SYan Zheng 29435d4f98a2SYan Zheng rb_node = rb_first(blocks); 29445d4f98a2SYan Zheng while (rb_node) { 29455d4f98a2SYan Zheng block = rb_entry(rb_node, struct tree_block, rb_node); 29465d4f98a2SYan Zheng 29473fd0a558SYan, Zheng node = build_backref_tree(rc, &block->key, 29485d4f98a2SYan Zheng block->level, block->bytenr); 29495d4f98a2SYan Zheng if (IS_ERR(node)) { 29505d4f98a2SYan Zheng err = PTR_ERR(node); 29515d4f98a2SYan Zheng goto out; 29525d4f98a2SYan Zheng } 29535d4f98a2SYan Zheng 29545d4f98a2SYan Zheng ret = relocate_tree_block(trans, rc, node, &block->key, 29555d4f98a2SYan Zheng path); 29565d4f98a2SYan Zheng if (ret < 0) { 29573fd0a558SYan, Zheng if (ret != -EAGAIN || rb_node == rb_first(blocks)) 29585d4f98a2SYan Zheng err = ret; 29595d4f98a2SYan Zheng goto out; 29605d4f98a2SYan Zheng } 29615d4f98a2SYan Zheng rb_node = rb_next(rb_node); 29625d4f98a2SYan Zheng } 29635d4f98a2SYan Zheng out: 29643fd0a558SYan, Zheng err = finish_pending_nodes(trans, rc, path, err); 29655d4f98a2SYan Zheng 296634c2b290SDavid Sterba out_free_path: 29675d4f98a2SYan Zheng btrfs_free_path(path); 296834c2b290SDavid Sterba out_free_blocks: 2969e1a12670SLiu Bo free_block_list(blocks); 29705d4f98a2SYan Zheng return err; 29715d4f98a2SYan Zheng } 29725d4f98a2SYan Zheng 29735d4f98a2SYan Zheng static noinline_for_stack 2974efa56464SYan, Zheng int prealloc_file_extent_cluster(struct inode *inode, 2975efa56464SYan, Zheng struct file_extent_cluster *cluster) 2976efa56464SYan, Zheng { 2977efa56464SYan, Zheng u64 alloc_hint = 0; 2978efa56464SYan, Zheng u64 start; 2979efa56464SYan, Zheng u64 end; 2980efa56464SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 2981efa56464SYan, Zheng u64 num_bytes; 2982efa56464SYan, Zheng int nr = 0; 2983efa56464SYan, Zheng int ret = 0; 2984efa56464SYan, Zheng 2985efa56464SYan, Zheng BUG_ON(cluster->start != cluster->boundary[0]); 2986efa56464SYan, Zheng mutex_lock(&inode->i_mutex); 2987efa56464SYan, Zheng 2988efa56464SYan, Zheng ret = btrfs_check_data_free_space(inode, cluster->end + 2989efa56464SYan, Zheng 1 - cluster->start); 2990efa56464SYan, Zheng if (ret) 2991efa56464SYan, Zheng goto out; 2992efa56464SYan, Zheng 2993efa56464SYan, Zheng while (nr < cluster->nr) { 2994efa56464SYan, Zheng start = cluster->boundary[nr] - offset; 2995efa56464SYan, Zheng if (nr + 1 < cluster->nr) 2996efa56464SYan, Zheng end = cluster->boundary[nr + 1] - 1 - offset; 2997efa56464SYan, Zheng else 2998efa56464SYan, Zheng end = cluster->end - offset; 2999efa56464SYan, Zheng 3000d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 3001efa56464SYan, Zheng num_bytes = end + 1 - start; 3002efa56464SYan, Zheng ret = btrfs_prealloc_file_range(inode, 0, start, 3003efa56464SYan, Zheng num_bytes, num_bytes, 3004efa56464SYan, Zheng end + 1, &alloc_hint); 3005d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 3006efa56464SYan, Zheng if (ret) 3007efa56464SYan, Zheng break; 3008efa56464SYan, Zheng nr++; 3009efa56464SYan, Zheng } 3010efa56464SYan, Zheng btrfs_free_reserved_data_space(inode, cluster->end + 3011efa56464SYan, Zheng 1 - cluster->start); 3012efa56464SYan, Zheng out: 3013efa56464SYan, Zheng mutex_unlock(&inode->i_mutex); 3014efa56464SYan, Zheng return ret; 3015efa56464SYan, Zheng } 3016efa56464SYan, Zheng 3017efa56464SYan, Zheng static noinline_for_stack 30180257bb82SYan, Zheng int setup_extent_mapping(struct inode *inode, u64 start, u64 end, 30190257bb82SYan, Zheng u64 block_start) 30205d4f98a2SYan Zheng { 30215d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(inode)->root; 30225d4f98a2SYan Zheng struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 30235d4f98a2SYan Zheng struct extent_map *em; 30240257bb82SYan, Zheng int ret = 0; 30255d4f98a2SYan Zheng 3026172ddd60SDavid Sterba em = alloc_extent_map(); 30270257bb82SYan, Zheng if (!em) 30280257bb82SYan, Zheng return -ENOMEM; 30290257bb82SYan, Zheng 30305d4f98a2SYan Zheng em->start = start; 30310257bb82SYan, Zheng em->len = end + 1 - start; 30320257bb82SYan, Zheng em->block_len = em->len; 30330257bb82SYan, Zheng em->block_start = block_start; 30345d4f98a2SYan Zheng em->bdev = root->fs_info->fs_devices->latest_bdev; 30355d4f98a2SYan Zheng set_bit(EXTENT_FLAG_PINNED, &em->flags); 30365d4f98a2SYan Zheng 3037d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, start, end); 30385d4f98a2SYan Zheng while (1) { 3039890871beSChris Mason write_lock(&em_tree->lock); 304009a2a8f9SJosef Bacik ret = add_extent_mapping(em_tree, em, 0); 3041890871beSChris Mason write_unlock(&em_tree->lock); 30425d4f98a2SYan Zheng if (ret != -EEXIST) { 30435d4f98a2SYan Zheng free_extent_map(em); 30445d4f98a2SYan Zheng break; 30455d4f98a2SYan Zheng } 30465d4f98a2SYan Zheng btrfs_drop_extent_cache(inode, start, end, 0); 30475d4f98a2SYan Zheng } 3048d0082371SJeff Mahoney unlock_extent(&BTRFS_I(inode)->io_tree, start, end); 30490257bb82SYan, Zheng return ret; 30500257bb82SYan, Zheng } 30515d4f98a2SYan Zheng 30520257bb82SYan, Zheng static int relocate_file_extent_cluster(struct inode *inode, 30530257bb82SYan, Zheng struct file_extent_cluster *cluster) 30540257bb82SYan, Zheng { 30550257bb82SYan, Zheng u64 page_start; 30560257bb82SYan, Zheng u64 page_end; 30570257bb82SYan, Zheng u64 offset = BTRFS_I(inode)->index_cnt; 30580257bb82SYan, Zheng unsigned long index; 30590257bb82SYan, Zheng unsigned long last_index; 30600257bb82SYan, Zheng struct page *page; 30610257bb82SYan, Zheng struct file_ra_state *ra; 30623b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 30630257bb82SYan, Zheng int nr = 0; 30640257bb82SYan, Zheng int ret = 0; 30650257bb82SYan, Zheng 30660257bb82SYan, Zheng if (!cluster->nr) 30670257bb82SYan, Zheng return 0; 30680257bb82SYan, Zheng 30690257bb82SYan, Zheng ra = kzalloc(sizeof(*ra), GFP_NOFS); 30700257bb82SYan, Zheng if (!ra) 30710257bb82SYan, Zheng return -ENOMEM; 30720257bb82SYan, Zheng 3073efa56464SYan, Zheng ret = prealloc_file_extent_cluster(inode, cluster); 30740257bb82SYan, Zheng if (ret) 3075efa56464SYan, Zheng goto out; 30760257bb82SYan, Zheng 30770257bb82SYan, Zheng file_ra_state_init(ra, inode->i_mapping); 30780257bb82SYan, Zheng 3079efa56464SYan, Zheng ret = setup_extent_mapping(inode, cluster->start - offset, 3080efa56464SYan, Zheng cluster->end - offset, cluster->start); 3081efa56464SYan, Zheng if (ret) 3082efa56464SYan, Zheng goto out; 3083efa56464SYan, Zheng 3084efa56464SYan, Zheng index = (cluster->start - offset) >> PAGE_CACHE_SHIFT; 3085efa56464SYan, Zheng last_index = (cluster->end - offset) >> PAGE_CACHE_SHIFT; 30860257bb82SYan, Zheng while (index <= last_index) { 3087efa56464SYan, Zheng ret = btrfs_delalloc_reserve_metadata(inode, PAGE_CACHE_SIZE); 3088efa56464SYan, Zheng if (ret) 3089efa56464SYan, Zheng goto out; 3090efa56464SYan, Zheng 30910257bb82SYan, Zheng page = find_lock_page(inode->i_mapping, index); 30920257bb82SYan, Zheng if (!page) { 30930257bb82SYan, Zheng page_cache_sync_readahead(inode->i_mapping, 30940257bb82SYan, Zheng ra, NULL, index, 30950257bb82SYan, Zheng last_index + 1 - index); 3096a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, index, 30973b16a4e3SJosef Bacik mask); 30980257bb82SYan, Zheng if (!page) { 3099efa56464SYan, Zheng btrfs_delalloc_release_metadata(inode, 3100efa56464SYan, Zheng PAGE_CACHE_SIZE); 31010257bb82SYan, Zheng ret = -ENOMEM; 3102efa56464SYan, Zheng goto out; 31030257bb82SYan, Zheng } 31040257bb82SYan, Zheng } 31050257bb82SYan, Zheng 31060257bb82SYan, Zheng if (PageReadahead(page)) { 31070257bb82SYan, Zheng page_cache_async_readahead(inode->i_mapping, 31080257bb82SYan, Zheng ra, NULL, page, index, 31090257bb82SYan, Zheng last_index + 1 - index); 31100257bb82SYan, Zheng } 31110257bb82SYan, Zheng 31120257bb82SYan, Zheng if (!PageUptodate(page)) { 31130257bb82SYan, Zheng btrfs_readpage(NULL, page); 31140257bb82SYan, Zheng lock_page(page); 31150257bb82SYan, Zheng if (!PageUptodate(page)) { 31160257bb82SYan, Zheng unlock_page(page); 31170257bb82SYan, Zheng page_cache_release(page); 3118efa56464SYan, Zheng btrfs_delalloc_release_metadata(inode, 3119efa56464SYan, Zheng PAGE_CACHE_SIZE); 31200257bb82SYan, Zheng ret = -EIO; 3121efa56464SYan, Zheng goto out; 31220257bb82SYan, Zheng } 31230257bb82SYan, Zheng } 31240257bb82SYan, Zheng 31254eee4fa4SMiao Xie page_start = page_offset(page); 31260257bb82SYan, Zheng page_end = page_start + PAGE_CACHE_SIZE - 1; 31270257bb82SYan, Zheng 3128d0082371SJeff Mahoney lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); 31290257bb82SYan, Zheng 31300257bb82SYan, Zheng set_page_extent_mapped(page); 31310257bb82SYan, Zheng 31320257bb82SYan, Zheng if (nr < cluster->nr && 31330257bb82SYan, Zheng page_start + offset == cluster->boundary[nr]) { 31340257bb82SYan, Zheng set_extent_bits(&BTRFS_I(inode)->io_tree, 31350257bb82SYan, Zheng page_start, page_end, 31360257bb82SYan, Zheng EXTENT_BOUNDARY, GFP_NOFS); 31370257bb82SYan, Zheng nr++; 31380257bb82SYan, Zheng } 31390257bb82SYan, Zheng 3140efa56464SYan, Zheng btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 31410257bb82SYan, Zheng set_page_dirty(page); 31420257bb82SYan, Zheng 31430257bb82SYan, Zheng unlock_extent(&BTRFS_I(inode)->io_tree, 3144d0082371SJeff Mahoney page_start, page_end); 31450257bb82SYan, Zheng unlock_page(page); 31460257bb82SYan, Zheng page_cache_release(page); 31470257bb82SYan, Zheng 31480257bb82SYan, Zheng index++; 3149efa56464SYan, Zheng balance_dirty_pages_ratelimited(inode->i_mapping); 3150efa56464SYan, Zheng btrfs_throttle(BTRFS_I(inode)->root); 31510257bb82SYan, Zheng } 31520257bb82SYan, Zheng WARN_ON(nr != cluster->nr); 3153efa56464SYan, Zheng out: 31540257bb82SYan, Zheng kfree(ra); 31550257bb82SYan, Zheng return ret; 31560257bb82SYan, Zheng } 31570257bb82SYan, Zheng 31580257bb82SYan, Zheng static noinline_for_stack 31590257bb82SYan, Zheng int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, 31600257bb82SYan, Zheng struct file_extent_cluster *cluster) 31610257bb82SYan, Zheng { 31620257bb82SYan, Zheng int ret; 31630257bb82SYan, Zheng 31640257bb82SYan, Zheng if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { 31650257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 31660257bb82SYan, Zheng if (ret) 31670257bb82SYan, Zheng return ret; 31680257bb82SYan, Zheng cluster->nr = 0; 31690257bb82SYan, Zheng } 31700257bb82SYan, Zheng 31710257bb82SYan, Zheng if (!cluster->nr) 31720257bb82SYan, Zheng cluster->start = extent_key->objectid; 31730257bb82SYan, Zheng else 31740257bb82SYan, Zheng BUG_ON(cluster->nr >= MAX_EXTENTS); 31750257bb82SYan, Zheng cluster->end = extent_key->objectid + extent_key->offset - 1; 31760257bb82SYan, Zheng cluster->boundary[cluster->nr] = extent_key->objectid; 31770257bb82SYan, Zheng cluster->nr++; 31780257bb82SYan, Zheng 31790257bb82SYan, Zheng if (cluster->nr >= MAX_EXTENTS) { 31800257bb82SYan, Zheng ret = relocate_file_extent_cluster(inode, cluster); 31810257bb82SYan, Zheng if (ret) 31820257bb82SYan, Zheng return ret; 31830257bb82SYan, Zheng cluster->nr = 0; 31840257bb82SYan, Zheng } 31850257bb82SYan, Zheng return 0; 31865d4f98a2SYan Zheng } 31875d4f98a2SYan Zheng 31885d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 31895d4f98a2SYan Zheng static int get_ref_objectid_v0(struct reloc_control *rc, 31905d4f98a2SYan Zheng struct btrfs_path *path, 31915d4f98a2SYan Zheng struct btrfs_key *extent_key, 31925d4f98a2SYan Zheng u64 *ref_objectid, int *path_change) 31935d4f98a2SYan Zheng { 31945d4f98a2SYan Zheng struct btrfs_key key; 31955d4f98a2SYan Zheng struct extent_buffer *leaf; 31965d4f98a2SYan Zheng struct btrfs_extent_ref_v0 *ref0; 31975d4f98a2SYan Zheng int ret; 31985d4f98a2SYan Zheng int slot; 31995d4f98a2SYan Zheng 32005d4f98a2SYan Zheng leaf = path->nodes[0]; 32015d4f98a2SYan Zheng slot = path->slots[0]; 32025d4f98a2SYan Zheng while (1) { 32035d4f98a2SYan Zheng if (slot >= btrfs_header_nritems(leaf)) { 32045d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 32055d4f98a2SYan Zheng if (ret < 0) 32065d4f98a2SYan Zheng return ret; 32075d4f98a2SYan Zheng BUG_ON(ret > 0); 32085d4f98a2SYan Zheng leaf = path->nodes[0]; 32095d4f98a2SYan Zheng slot = path->slots[0]; 32105d4f98a2SYan Zheng if (path_change) 32115d4f98a2SYan Zheng *path_change = 1; 32125d4f98a2SYan Zheng } 32135d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 32145d4f98a2SYan Zheng if (key.objectid != extent_key->objectid) 32155d4f98a2SYan Zheng return -ENOENT; 32165d4f98a2SYan Zheng 32175d4f98a2SYan Zheng if (key.type != BTRFS_EXTENT_REF_V0_KEY) { 32185d4f98a2SYan Zheng slot++; 32195d4f98a2SYan Zheng continue; 32205d4f98a2SYan Zheng } 32215d4f98a2SYan Zheng ref0 = btrfs_item_ptr(leaf, slot, 32225d4f98a2SYan Zheng struct btrfs_extent_ref_v0); 32235d4f98a2SYan Zheng *ref_objectid = btrfs_ref_objectid_v0(leaf, ref0); 32245d4f98a2SYan Zheng break; 32255d4f98a2SYan Zheng } 32265d4f98a2SYan Zheng return 0; 32275d4f98a2SYan Zheng } 32285d4f98a2SYan Zheng #endif 32295d4f98a2SYan Zheng 32305d4f98a2SYan Zheng /* 32315d4f98a2SYan Zheng * helper to add a tree block to the list. 32325d4f98a2SYan Zheng * the major work is getting the generation and level of the block 32335d4f98a2SYan Zheng */ 32345d4f98a2SYan Zheng static int add_tree_block(struct reloc_control *rc, 32355d4f98a2SYan Zheng struct btrfs_key *extent_key, 32365d4f98a2SYan Zheng struct btrfs_path *path, 32375d4f98a2SYan Zheng struct rb_root *blocks) 32385d4f98a2SYan Zheng { 32395d4f98a2SYan Zheng struct extent_buffer *eb; 32405d4f98a2SYan Zheng struct btrfs_extent_item *ei; 32415d4f98a2SYan Zheng struct btrfs_tree_block_info *bi; 32425d4f98a2SYan Zheng struct tree_block *block; 32435d4f98a2SYan Zheng struct rb_node *rb_node; 32445d4f98a2SYan Zheng u32 item_size; 32455d4f98a2SYan Zheng int level = -1; 32465d4f98a2SYan Zheng int generation; 32475d4f98a2SYan Zheng 32485d4f98a2SYan Zheng eb = path->nodes[0]; 32495d4f98a2SYan Zheng item_size = btrfs_item_size_nr(eb, path->slots[0]); 32505d4f98a2SYan Zheng 32513173a18fSJosef Bacik if (extent_key->type == BTRFS_METADATA_ITEM_KEY || 32523173a18fSJosef Bacik item_size >= sizeof(*ei) + sizeof(*bi)) { 32535d4f98a2SYan Zheng ei = btrfs_item_ptr(eb, path->slots[0], 32545d4f98a2SYan Zheng struct btrfs_extent_item); 32553173a18fSJosef Bacik if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { 32565d4f98a2SYan Zheng bi = (struct btrfs_tree_block_info *)(ei + 1); 32575d4f98a2SYan Zheng level = btrfs_tree_block_level(eb, bi); 32585d4f98a2SYan Zheng } else { 32593173a18fSJosef Bacik level = (int)extent_key->offset; 32603173a18fSJosef Bacik } 32613173a18fSJosef Bacik generation = btrfs_extent_generation(eb, ei); 32623173a18fSJosef Bacik } else { 32635d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 32645d4f98a2SYan Zheng u64 ref_owner; 32655d4f98a2SYan Zheng int ret; 32665d4f98a2SYan Zheng 32675d4f98a2SYan Zheng BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0)); 32685d4f98a2SYan Zheng ret = get_ref_objectid_v0(rc, path, extent_key, 32695d4f98a2SYan Zheng &ref_owner, NULL); 3270411fc6bcSAndi Kleen if (ret < 0) 3271411fc6bcSAndi Kleen return ret; 32725d4f98a2SYan Zheng BUG_ON(ref_owner >= BTRFS_MAX_LEVEL); 32735d4f98a2SYan Zheng level = (int)ref_owner; 32745d4f98a2SYan Zheng /* FIXME: get real generation */ 32755d4f98a2SYan Zheng generation = 0; 32765d4f98a2SYan Zheng #else 32775d4f98a2SYan Zheng BUG(); 32785d4f98a2SYan Zheng #endif 32795d4f98a2SYan Zheng } 32805d4f98a2SYan Zheng 3281b3b4aa74SDavid Sterba btrfs_release_path(path); 32825d4f98a2SYan Zheng 32835d4f98a2SYan Zheng BUG_ON(level == -1); 32845d4f98a2SYan Zheng 32855d4f98a2SYan Zheng block = kmalloc(sizeof(*block), GFP_NOFS); 32865d4f98a2SYan Zheng if (!block) 32875d4f98a2SYan Zheng return -ENOMEM; 32885d4f98a2SYan Zheng 32895d4f98a2SYan Zheng block->bytenr = extent_key->objectid; 32903173a18fSJosef Bacik block->key.objectid = rc->extent_root->leafsize; 32915d4f98a2SYan Zheng block->key.offset = generation; 32925d4f98a2SYan Zheng block->level = level; 32935d4f98a2SYan Zheng block->key_ready = 0; 32945d4f98a2SYan Zheng 32955d4f98a2SYan Zheng rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); 329643c04fb1SJeff Mahoney if (rb_node) 329743c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, block->bytenr); 32985d4f98a2SYan Zheng 32995d4f98a2SYan Zheng return 0; 33005d4f98a2SYan Zheng } 33015d4f98a2SYan Zheng 33025d4f98a2SYan Zheng /* 33035d4f98a2SYan Zheng * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY 33045d4f98a2SYan Zheng */ 33055d4f98a2SYan Zheng static int __add_tree_block(struct reloc_control *rc, 33065d4f98a2SYan Zheng u64 bytenr, u32 blocksize, 33075d4f98a2SYan Zheng struct rb_root *blocks) 33085d4f98a2SYan Zheng { 33095d4f98a2SYan Zheng struct btrfs_path *path; 33105d4f98a2SYan Zheng struct btrfs_key key; 33115d4f98a2SYan Zheng int ret; 33125d4f98a2SYan Zheng 33135d4f98a2SYan Zheng if (tree_block_processed(bytenr, blocksize, rc)) 33145d4f98a2SYan Zheng return 0; 33155d4f98a2SYan Zheng 33165d4f98a2SYan Zheng if (tree_search(blocks, bytenr)) 33175d4f98a2SYan Zheng return 0; 33185d4f98a2SYan Zheng 33195d4f98a2SYan Zheng path = btrfs_alloc_path(); 33205d4f98a2SYan Zheng if (!path) 33215d4f98a2SYan Zheng return -ENOMEM; 33225d4f98a2SYan Zheng 33235d4f98a2SYan Zheng key.objectid = bytenr; 33245d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 33255d4f98a2SYan Zheng key.offset = blocksize; 33265d4f98a2SYan Zheng 33275d4f98a2SYan Zheng path->search_commit_root = 1; 33285d4f98a2SYan Zheng path->skip_locking = 1; 33295d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); 33305d4f98a2SYan Zheng if (ret < 0) 33315d4f98a2SYan Zheng goto out; 33325d4f98a2SYan Zheng 33335d4f98a2SYan Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 33343173a18fSJosef Bacik if (ret > 0) { 33353173a18fSJosef Bacik if (key.objectid == bytenr && 33363173a18fSJosef Bacik key.type == BTRFS_METADATA_ITEM_KEY) 33373173a18fSJosef Bacik ret = 0; 33383173a18fSJosef Bacik } 33393173a18fSJosef Bacik BUG_ON(ret); 33403173a18fSJosef Bacik 33415d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, blocks); 33425d4f98a2SYan Zheng out: 33435d4f98a2SYan Zheng btrfs_free_path(path); 33445d4f98a2SYan Zheng return ret; 33455d4f98a2SYan Zheng } 33465d4f98a2SYan Zheng 33475d4f98a2SYan Zheng /* 33485d4f98a2SYan Zheng * helper to check if the block use full backrefs for pointers in it 33495d4f98a2SYan Zheng */ 33505d4f98a2SYan Zheng static int block_use_full_backref(struct reloc_control *rc, 33515d4f98a2SYan Zheng struct extent_buffer *eb) 33525d4f98a2SYan Zheng { 33535d4f98a2SYan Zheng u64 flags; 33545d4f98a2SYan Zheng int ret; 33555d4f98a2SYan Zheng 33565d4f98a2SYan Zheng if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) || 33575d4f98a2SYan Zheng btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV) 33585d4f98a2SYan Zheng return 1; 33595d4f98a2SYan Zheng 33603fd0a558SYan, Zheng ret = btrfs_lookup_extent_info(NULL, rc->extent_root, 33613173a18fSJosef Bacik eb->start, btrfs_header_level(eb), 1, 33623173a18fSJosef Bacik NULL, &flags); 33635d4f98a2SYan Zheng BUG_ON(ret); 33645d4f98a2SYan Zheng 33655d4f98a2SYan Zheng if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) 33665d4f98a2SYan Zheng ret = 1; 33675d4f98a2SYan Zheng else 33685d4f98a2SYan Zheng ret = 0; 33695d4f98a2SYan Zheng return ret; 33705d4f98a2SYan Zheng } 33715d4f98a2SYan Zheng 33720af3d00bSJosef Bacik static int delete_block_group_cache(struct btrfs_fs_info *fs_info, 33730af3d00bSJosef Bacik struct inode *inode, u64 ino) 33740af3d00bSJosef Bacik { 33750af3d00bSJosef Bacik struct btrfs_key key; 33760af3d00bSJosef Bacik struct btrfs_path *path; 33770af3d00bSJosef Bacik struct btrfs_root *root = fs_info->tree_root; 33780af3d00bSJosef Bacik struct btrfs_trans_handle *trans; 33790af3d00bSJosef Bacik int ret = 0; 33800af3d00bSJosef Bacik 33810af3d00bSJosef Bacik if (inode) 33820af3d00bSJosef Bacik goto truncate; 33830af3d00bSJosef Bacik 33840af3d00bSJosef Bacik key.objectid = ino; 33850af3d00bSJosef Bacik key.type = BTRFS_INODE_ITEM_KEY; 33860af3d00bSJosef Bacik key.offset = 0; 33870af3d00bSJosef Bacik 33880af3d00bSJosef Bacik inode = btrfs_iget(fs_info->sb, &key, root, NULL); 3389f54fb859STsutomu Itoh if (IS_ERR(inode) || is_bad_inode(inode)) { 3390f54fb859STsutomu Itoh if (!IS_ERR(inode)) 33910af3d00bSJosef Bacik iput(inode); 33920af3d00bSJosef Bacik return -ENOENT; 33930af3d00bSJosef Bacik } 33940af3d00bSJosef Bacik 33950af3d00bSJosef Bacik truncate: 33967b61cd92SMiao Xie ret = btrfs_check_trunc_cache_free_space(root, 33977b61cd92SMiao Xie &fs_info->global_block_rsv); 33987b61cd92SMiao Xie if (ret) 33997b61cd92SMiao Xie goto out; 34007b61cd92SMiao Xie 34010af3d00bSJosef Bacik path = btrfs_alloc_path(); 34020af3d00bSJosef Bacik if (!path) { 34030af3d00bSJosef Bacik ret = -ENOMEM; 34040af3d00bSJosef Bacik goto out; 34050af3d00bSJosef Bacik } 34060af3d00bSJosef Bacik 34077a7eaa40SJosef Bacik trans = btrfs_join_transaction(root); 34080af3d00bSJosef Bacik if (IS_ERR(trans)) { 34090af3d00bSJosef Bacik btrfs_free_path(path); 34103612b495STsutomu Itoh ret = PTR_ERR(trans); 34110af3d00bSJosef Bacik goto out; 34120af3d00bSJosef Bacik } 34130af3d00bSJosef Bacik 34140af3d00bSJosef Bacik ret = btrfs_truncate_free_space_cache(root, trans, path, inode); 34150af3d00bSJosef Bacik 34160af3d00bSJosef Bacik btrfs_free_path(path); 34170af3d00bSJosef Bacik btrfs_end_transaction(trans, root); 3418b53d3f5dSLiu Bo btrfs_btree_balance_dirty(root); 34190af3d00bSJosef Bacik out: 34200af3d00bSJosef Bacik iput(inode); 34210af3d00bSJosef Bacik return ret; 34220af3d00bSJosef Bacik } 34230af3d00bSJosef Bacik 34245d4f98a2SYan Zheng /* 34255d4f98a2SYan Zheng * helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY 34265d4f98a2SYan Zheng * this function scans fs tree to find blocks reference the data extent 34275d4f98a2SYan Zheng */ 34285d4f98a2SYan Zheng static int find_data_references(struct reloc_control *rc, 34295d4f98a2SYan Zheng struct btrfs_key *extent_key, 34305d4f98a2SYan Zheng struct extent_buffer *leaf, 34315d4f98a2SYan Zheng struct btrfs_extent_data_ref *ref, 34325d4f98a2SYan Zheng struct rb_root *blocks) 34335d4f98a2SYan Zheng { 34345d4f98a2SYan Zheng struct btrfs_path *path; 34355d4f98a2SYan Zheng struct tree_block *block; 34365d4f98a2SYan Zheng struct btrfs_root *root; 34375d4f98a2SYan Zheng struct btrfs_file_extent_item *fi; 34385d4f98a2SYan Zheng struct rb_node *rb_node; 34395d4f98a2SYan Zheng struct btrfs_key key; 34405d4f98a2SYan Zheng u64 ref_root; 34415d4f98a2SYan Zheng u64 ref_objectid; 34425d4f98a2SYan Zheng u64 ref_offset; 34435d4f98a2SYan Zheng u32 ref_count; 34445d4f98a2SYan Zheng u32 nritems; 34455d4f98a2SYan Zheng int err = 0; 34465d4f98a2SYan Zheng int added = 0; 34475d4f98a2SYan Zheng int counted; 34485d4f98a2SYan Zheng int ret; 34495d4f98a2SYan Zheng 34505d4f98a2SYan Zheng ref_root = btrfs_extent_data_ref_root(leaf, ref); 34515d4f98a2SYan Zheng ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref); 34525d4f98a2SYan Zheng ref_offset = btrfs_extent_data_ref_offset(leaf, ref); 34535d4f98a2SYan Zheng ref_count = btrfs_extent_data_ref_count(leaf, ref); 34545d4f98a2SYan Zheng 34550af3d00bSJosef Bacik /* 34560af3d00bSJosef Bacik * This is an extent belonging to the free space cache, lets just delete 34570af3d00bSJosef Bacik * it and redo the search. 34580af3d00bSJosef Bacik */ 34590af3d00bSJosef Bacik if (ref_root == BTRFS_ROOT_TREE_OBJECTID) { 34600af3d00bSJosef Bacik ret = delete_block_group_cache(rc->extent_root->fs_info, 34610af3d00bSJosef Bacik NULL, ref_objectid); 34620af3d00bSJosef Bacik if (ret != -ENOENT) 34630af3d00bSJosef Bacik return ret; 34640af3d00bSJosef Bacik ret = 0; 34650af3d00bSJosef Bacik } 34660af3d00bSJosef Bacik 34670af3d00bSJosef Bacik path = btrfs_alloc_path(); 34680af3d00bSJosef Bacik if (!path) 34690af3d00bSJosef Bacik return -ENOMEM; 3470026fd317SJosef Bacik path->reada = 1; 34710af3d00bSJosef Bacik 34725d4f98a2SYan Zheng root = read_fs_root(rc->extent_root->fs_info, ref_root); 34735d4f98a2SYan Zheng if (IS_ERR(root)) { 34745d4f98a2SYan Zheng err = PTR_ERR(root); 34755d4f98a2SYan Zheng goto out; 34765d4f98a2SYan Zheng } 34775d4f98a2SYan Zheng 34785d4f98a2SYan Zheng key.objectid = ref_objectid; 34795d4f98a2SYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 348084850e8dSYan, Zheng if (ref_offset > ((u64)-1 << 32)) 348184850e8dSYan, Zheng key.offset = 0; 348284850e8dSYan, Zheng else 348384850e8dSYan, Zheng key.offset = ref_offset; 34845d4f98a2SYan Zheng 34855d4f98a2SYan Zheng path->search_commit_root = 1; 34865d4f98a2SYan Zheng path->skip_locking = 1; 34875d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 34885d4f98a2SYan Zheng if (ret < 0) { 34895d4f98a2SYan Zheng err = ret; 34905d4f98a2SYan Zheng goto out; 34915d4f98a2SYan Zheng } 34925d4f98a2SYan Zheng 34935d4f98a2SYan Zheng leaf = path->nodes[0]; 34945d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 34955d4f98a2SYan Zheng /* 34965d4f98a2SYan Zheng * the references in tree blocks that use full backrefs 34975d4f98a2SYan Zheng * are not counted in 34985d4f98a2SYan Zheng */ 34995d4f98a2SYan Zheng if (block_use_full_backref(rc, leaf)) 35005d4f98a2SYan Zheng counted = 0; 35015d4f98a2SYan Zheng else 35025d4f98a2SYan Zheng counted = 1; 35035d4f98a2SYan Zheng rb_node = tree_search(blocks, leaf->start); 35045d4f98a2SYan Zheng if (rb_node) { 35055d4f98a2SYan Zheng if (counted) 35065d4f98a2SYan Zheng added = 1; 35075d4f98a2SYan Zheng else 35085d4f98a2SYan Zheng path->slots[0] = nritems; 35095d4f98a2SYan Zheng } 35105d4f98a2SYan Zheng 35115d4f98a2SYan Zheng while (ref_count > 0) { 35125d4f98a2SYan Zheng while (path->slots[0] >= nritems) { 35135d4f98a2SYan Zheng ret = btrfs_next_leaf(root, path); 35145d4f98a2SYan Zheng if (ret < 0) { 35155d4f98a2SYan Zheng err = ret; 35165d4f98a2SYan Zheng goto out; 35175d4f98a2SYan Zheng } 35185d4f98a2SYan Zheng if (ret > 0) { 35195d4f98a2SYan Zheng WARN_ON(1); 35205d4f98a2SYan Zheng goto out; 35215d4f98a2SYan Zheng } 35225d4f98a2SYan Zheng 35235d4f98a2SYan Zheng leaf = path->nodes[0]; 35245d4f98a2SYan Zheng nritems = btrfs_header_nritems(leaf); 35255d4f98a2SYan Zheng added = 0; 35265d4f98a2SYan Zheng 35275d4f98a2SYan Zheng if (block_use_full_backref(rc, leaf)) 35285d4f98a2SYan Zheng counted = 0; 35295d4f98a2SYan Zheng else 35305d4f98a2SYan Zheng counted = 1; 35315d4f98a2SYan Zheng rb_node = tree_search(blocks, leaf->start); 35325d4f98a2SYan Zheng if (rb_node) { 35335d4f98a2SYan Zheng if (counted) 35345d4f98a2SYan Zheng added = 1; 35355d4f98a2SYan Zheng else 35365d4f98a2SYan Zheng path->slots[0] = nritems; 35375d4f98a2SYan Zheng } 35385d4f98a2SYan Zheng } 35395d4f98a2SYan Zheng 35405d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 35415d4f98a2SYan Zheng if (key.objectid != ref_objectid || 35425d4f98a2SYan Zheng key.type != BTRFS_EXTENT_DATA_KEY) { 35435d4f98a2SYan Zheng WARN_ON(1); 35445d4f98a2SYan Zheng break; 35455d4f98a2SYan Zheng } 35465d4f98a2SYan Zheng 35475d4f98a2SYan Zheng fi = btrfs_item_ptr(leaf, path->slots[0], 35485d4f98a2SYan Zheng struct btrfs_file_extent_item); 35495d4f98a2SYan Zheng 35505d4f98a2SYan Zheng if (btrfs_file_extent_type(leaf, fi) == 35515d4f98a2SYan Zheng BTRFS_FILE_EXTENT_INLINE) 35525d4f98a2SYan Zheng goto next; 35535d4f98a2SYan Zheng 35545d4f98a2SYan Zheng if (btrfs_file_extent_disk_bytenr(leaf, fi) != 35555d4f98a2SYan Zheng extent_key->objectid) 35565d4f98a2SYan Zheng goto next; 35575d4f98a2SYan Zheng 35585d4f98a2SYan Zheng key.offset -= btrfs_file_extent_offset(leaf, fi); 35595d4f98a2SYan Zheng if (key.offset != ref_offset) 35605d4f98a2SYan Zheng goto next; 35615d4f98a2SYan Zheng 35625d4f98a2SYan Zheng if (counted) 35635d4f98a2SYan Zheng ref_count--; 35645d4f98a2SYan Zheng if (added) 35655d4f98a2SYan Zheng goto next; 35665d4f98a2SYan Zheng 35675d4f98a2SYan Zheng if (!tree_block_processed(leaf->start, leaf->len, rc)) { 35685d4f98a2SYan Zheng block = kmalloc(sizeof(*block), GFP_NOFS); 35695d4f98a2SYan Zheng if (!block) { 35705d4f98a2SYan Zheng err = -ENOMEM; 35715d4f98a2SYan Zheng break; 35725d4f98a2SYan Zheng } 35735d4f98a2SYan Zheng block->bytenr = leaf->start; 35745d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &block->key, 0); 35755d4f98a2SYan Zheng block->level = 0; 35765d4f98a2SYan Zheng block->key_ready = 1; 35775d4f98a2SYan Zheng rb_node = tree_insert(blocks, block->bytenr, 35785d4f98a2SYan Zheng &block->rb_node); 357943c04fb1SJeff Mahoney if (rb_node) 358043c04fb1SJeff Mahoney backref_tree_panic(rb_node, -EEXIST, 358143c04fb1SJeff Mahoney block->bytenr); 35825d4f98a2SYan Zheng } 35835d4f98a2SYan Zheng if (counted) 35845d4f98a2SYan Zheng added = 1; 35855d4f98a2SYan Zheng else 35865d4f98a2SYan Zheng path->slots[0] = nritems; 35875d4f98a2SYan Zheng next: 35885d4f98a2SYan Zheng path->slots[0]++; 35895d4f98a2SYan Zheng 35905d4f98a2SYan Zheng } 35915d4f98a2SYan Zheng out: 35925d4f98a2SYan Zheng btrfs_free_path(path); 35935d4f98a2SYan Zheng return err; 35945d4f98a2SYan Zheng } 35955d4f98a2SYan Zheng 35965d4f98a2SYan Zheng /* 35972c016dc2SLiu Bo * helper to find all tree blocks that reference a given data extent 35985d4f98a2SYan Zheng */ 35995d4f98a2SYan Zheng static noinline_for_stack 36005d4f98a2SYan Zheng int add_data_references(struct reloc_control *rc, 36015d4f98a2SYan Zheng struct btrfs_key *extent_key, 36025d4f98a2SYan Zheng struct btrfs_path *path, 36035d4f98a2SYan Zheng struct rb_root *blocks) 36045d4f98a2SYan Zheng { 36055d4f98a2SYan Zheng struct btrfs_key key; 36065d4f98a2SYan Zheng struct extent_buffer *eb; 36075d4f98a2SYan Zheng struct btrfs_extent_data_ref *dref; 36085d4f98a2SYan Zheng struct btrfs_extent_inline_ref *iref; 36095d4f98a2SYan Zheng unsigned long ptr; 36105d4f98a2SYan Zheng unsigned long end; 36113fd0a558SYan, Zheng u32 blocksize = btrfs_level_size(rc->extent_root, 0); 36125d4f98a2SYan Zheng int ret; 36135d4f98a2SYan Zheng int err = 0; 36145d4f98a2SYan Zheng 36155d4f98a2SYan Zheng eb = path->nodes[0]; 36165d4f98a2SYan Zheng ptr = btrfs_item_ptr_offset(eb, path->slots[0]); 36175d4f98a2SYan Zheng end = ptr + btrfs_item_size_nr(eb, path->slots[0]); 36185d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 36195d4f98a2SYan Zheng if (ptr + sizeof(struct btrfs_extent_item_v0) == end) 36205d4f98a2SYan Zheng ptr = end; 36215d4f98a2SYan Zheng else 36225d4f98a2SYan Zheng #endif 36235d4f98a2SYan Zheng ptr += sizeof(struct btrfs_extent_item); 36245d4f98a2SYan Zheng 36255d4f98a2SYan Zheng while (ptr < end) { 36265d4f98a2SYan Zheng iref = (struct btrfs_extent_inline_ref *)ptr; 36275d4f98a2SYan Zheng key.type = btrfs_extent_inline_ref_type(eb, iref); 36285d4f98a2SYan Zheng if (key.type == BTRFS_SHARED_DATA_REF_KEY) { 36295d4f98a2SYan Zheng key.offset = btrfs_extent_inline_ref_offset(eb, iref); 36305d4f98a2SYan Zheng ret = __add_tree_block(rc, key.offset, blocksize, 36315d4f98a2SYan Zheng blocks); 36325d4f98a2SYan Zheng } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { 36335d4f98a2SYan Zheng dref = (struct btrfs_extent_data_ref *)(&iref->offset); 36345d4f98a2SYan Zheng ret = find_data_references(rc, extent_key, 36355d4f98a2SYan Zheng eb, dref, blocks); 36365d4f98a2SYan Zheng } else { 36375d4f98a2SYan Zheng BUG(); 36385d4f98a2SYan Zheng } 36395d4f98a2SYan Zheng ptr += btrfs_extent_inline_ref_size(key.type); 36405d4f98a2SYan Zheng } 36415d4f98a2SYan Zheng WARN_ON(ptr > end); 36425d4f98a2SYan Zheng 36435d4f98a2SYan Zheng while (1) { 36445d4f98a2SYan Zheng cond_resched(); 36455d4f98a2SYan Zheng eb = path->nodes[0]; 36465d4f98a2SYan Zheng if (path->slots[0] >= btrfs_header_nritems(eb)) { 36475d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 36485d4f98a2SYan Zheng if (ret < 0) { 36495d4f98a2SYan Zheng err = ret; 36505d4f98a2SYan Zheng break; 36515d4f98a2SYan Zheng } 36525d4f98a2SYan Zheng if (ret > 0) 36535d4f98a2SYan Zheng break; 36545d4f98a2SYan Zheng eb = path->nodes[0]; 36555d4f98a2SYan Zheng } 36565d4f98a2SYan Zheng 36575d4f98a2SYan Zheng btrfs_item_key_to_cpu(eb, &key, path->slots[0]); 36585d4f98a2SYan Zheng if (key.objectid != extent_key->objectid) 36595d4f98a2SYan Zheng break; 36605d4f98a2SYan Zheng 36615d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 36625d4f98a2SYan Zheng if (key.type == BTRFS_SHARED_DATA_REF_KEY || 36635d4f98a2SYan Zheng key.type == BTRFS_EXTENT_REF_V0_KEY) { 36645d4f98a2SYan Zheng #else 36655d4f98a2SYan Zheng BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); 36665d4f98a2SYan Zheng if (key.type == BTRFS_SHARED_DATA_REF_KEY) { 36675d4f98a2SYan Zheng #endif 36685d4f98a2SYan Zheng ret = __add_tree_block(rc, key.offset, blocksize, 36695d4f98a2SYan Zheng blocks); 36705d4f98a2SYan Zheng } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { 36715d4f98a2SYan Zheng dref = btrfs_item_ptr(eb, path->slots[0], 36725d4f98a2SYan Zheng struct btrfs_extent_data_ref); 36735d4f98a2SYan Zheng ret = find_data_references(rc, extent_key, 36745d4f98a2SYan Zheng eb, dref, blocks); 36755d4f98a2SYan Zheng } else { 36765d4f98a2SYan Zheng ret = 0; 36775d4f98a2SYan Zheng } 36785d4f98a2SYan Zheng if (ret) { 36795d4f98a2SYan Zheng err = ret; 36805d4f98a2SYan Zheng break; 36815d4f98a2SYan Zheng } 36825d4f98a2SYan Zheng path->slots[0]++; 36835d4f98a2SYan Zheng } 3684b3b4aa74SDavid Sterba btrfs_release_path(path); 36855d4f98a2SYan Zheng if (err) 36865d4f98a2SYan Zheng free_block_list(blocks); 36875d4f98a2SYan Zheng return err; 36885d4f98a2SYan Zheng } 36895d4f98a2SYan Zheng 36905d4f98a2SYan Zheng /* 36912c016dc2SLiu Bo * helper to find next unprocessed extent 36925d4f98a2SYan Zheng */ 36935d4f98a2SYan Zheng static noinline_for_stack 36945d4f98a2SYan Zheng int find_next_extent(struct btrfs_trans_handle *trans, 36953fd0a558SYan, Zheng struct reloc_control *rc, struct btrfs_path *path, 36963fd0a558SYan, Zheng struct btrfs_key *extent_key) 36975d4f98a2SYan Zheng { 36985d4f98a2SYan Zheng struct btrfs_key key; 36995d4f98a2SYan Zheng struct extent_buffer *leaf; 37005d4f98a2SYan Zheng u64 start, end, last; 37015d4f98a2SYan Zheng int ret; 37025d4f98a2SYan Zheng 37035d4f98a2SYan Zheng last = rc->block_group->key.objectid + rc->block_group->key.offset; 37045d4f98a2SYan Zheng while (1) { 37055d4f98a2SYan Zheng cond_resched(); 37065d4f98a2SYan Zheng if (rc->search_start >= last) { 37075d4f98a2SYan Zheng ret = 1; 37085d4f98a2SYan Zheng break; 37095d4f98a2SYan Zheng } 37105d4f98a2SYan Zheng 37115d4f98a2SYan Zheng key.objectid = rc->search_start; 37125d4f98a2SYan Zheng key.type = BTRFS_EXTENT_ITEM_KEY; 37135d4f98a2SYan Zheng key.offset = 0; 37145d4f98a2SYan Zheng 37155d4f98a2SYan Zheng path->search_commit_root = 1; 37165d4f98a2SYan Zheng path->skip_locking = 1; 37175d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 37185d4f98a2SYan Zheng 0, 0); 37195d4f98a2SYan Zheng if (ret < 0) 37205d4f98a2SYan Zheng break; 37215d4f98a2SYan Zheng next: 37225d4f98a2SYan Zheng leaf = path->nodes[0]; 37235d4f98a2SYan Zheng if (path->slots[0] >= btrfs_header_nritems(leaf)) { 37245d4f98a2SYan Zheng ret = btrfs_next_leaf(rc->extent_root, path); 37255d4f98a2SYan Zheng if (ret != 0) 37265d4f98a2SYan Zheng break; 37275d4f98a2SYan Zheng leaf = path->nodes[0]; 37285d4f98a2SYan Zheng } 37295d4f98a2SYan Zheng 37305d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 37315d4f98a2SYan Zheng if (key.objectid >= last) { 37325d4f98a2SYan Zheng ret = 1; 37335d4f98a2SYan Zheng break; 37345d4f98a2SYan Zheng } 37355d4f98a2SYan Zheng 37363173a18fSJosef Bacik if (key.type != BTRFS_EXTENT_ITEM_KEY && 37373173a18fSJosef Bacik key.type != BTRFS_METADATA_ITEM_KEY) { 37383173a18fSJosef Bacik path->slots[0]++; 37393173a18fSJosef Bacik goto next; 37403173a18fSJosef Bacik } 37413173a18fSJosef Bacik 37423173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY && 37435d4f98a2SYan Zheng key.objectid + key.offset <= rc->search_start) { 37445d4f98a2SYan Zheng path->slots[0]++; 37455d4f98a2SYan Zheng goto next; 37465d4f98a2SYan Zheng } 37475d4f98a2SYan Zheng 37483173a18fSJosef Bacik if (key.type == BTRFS_METADATA_ITEM_KEY && 37493173a18fSJosef Bacik key.objectid + rc->extent_root->leafsize <= 37503173a18fSJosef Bacik rc->search_start) { 37513173a18fSJosef Bacik path->slots[0]++; 37523173a18fSJosef Bacik goto next; 37533173a18fSJosef Bacik } 37543173a18fSJosef Bacik 37555d4f98a2SYan Zheng ret = find_first_extent_bit(&rc->processed_blocks, 37565d4f98a2SYan Zheng key.objectid, &start, &end, 3757e6138876SJosef Bacik EXTENT_DIRTY, NULL); 37585d4f98a2SYan Zheng 37595d4f98a2SYan Zheng if (ret == 0 && start <= key.objectid) { 3760b3b4aa74SDavid Sterba btrfs_release_path(path); 37615d4f98a2SYan Zheng rc->search_start = end + 1; 37625d4f98a2SYan Zheng } else { 37633173a18fSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY) 37645d4f98a2SYan Zheng rc->search_start = key.objectid + key.offset; 37653173a18fSJosef Bacik else 37663173a18fSJosef Bacik rc->search_start = key.objectid + 37673173a18fSJosef Bacik rc->extent_root->leafsize; 37683fd0a558SYan, Zheng memcpy(extent_key, &key, sizeof(key)); 37695d4f98a2SYan Zheng return 0; 37705d4f98a2SYan Zheng } 37715d4f98a2SYan Zheng } 3772b3b4aa74SDavid Sterba btrfs_release_path(path); 37735d4f98a2SYan Zheng return ret; 37745d4f98a2SYan Zheng } 37755d4f98a2SYan Zheng 37765d4f98a2SYan Zheng static void set_reloc_control(struct reloc_control *rc) 37775d4f98a2SYan Zheng { 37785d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 37797585717fSChris Mason 37807585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 37815d4f98a2SYan Zheng fs_info->reloc_ctl = rc; 37827585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 37835d4f98a2SYan Zheng } 37845d4f98a2SYan Zheng 37855d4f98a2SYan Zheng static void unset_reloc_control(struct reloc_control *rc) 37865d4f98a2SYan Zheng { 37875d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; 37887585717fSChris Mason 37897585717fSChris Mason mutex_lock(&fs_info->reloc_mutex); 37905d4f98a2SYan Zheng fs_info->reloc_ctl = NULL; 37917585717fSChris Mason mutex_unlock(&fs_info->reloc_mutex); 37925d4f98a2SYan Zheng } 37935d4f98a2SYan Zheng 37945d4f98a2SYan Zheng static int check_extent_flags(u64 flags) 37955d4f98a2SYan Zheng { 37965d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 37975d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 37985d4f98a2SYan Zheng return 1; 37995d4f98a2SYan Zheng if (!(flags & BTRFS_EXTENT_FLAG_DATA) && 38005d4f98a2SYan Zheng !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) 38015d4f98a2SYan Zheng return 1; 38025d4f98a2SYan Zheng if ((flags & BTRFS_EXTENT_FLAG_DATA) && 38035d4f98a2SYan Zheng (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) 38045d4f98a2SYan Zheng return 1; 38055d4f98a2SYan Zheng return 0; 38065d4f98a2SYan Zheng } 38075d4f98a2SYan Zheng 38083fd0a558SYan, Zheng static noinline_for_stack 38093fd0a558SYan, Zheng int prepare_to_relocate(struct reloc_control *rc) 38103fd0a558SYan, Zheng { 38113fd0a558SYan, Zheng struct btrfs_trans_handle *trans; 38123fd0a558SYan, Zheng int ret; 38133fd0a558SYan, Zheng 381466d8f3ddSMiao Xie rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root, 381566d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 38163fd0a558SYan, Zheng if (!rc->block_rsv) 38173fd0a558SYan, Zheng return -ENOMEM; 38183fd0a558SYan, Zheng 38193fd0a558SYan, Zheng /* 38203fd0a558SYan, Zheng * reserve some space for creating reloc trees. 38213fd0a558SYan, Zheng * btrfs_init_reloc_root will use them when there 38223fd0a558SYan, Zheng * is no reservation in transaction handle. 38233fd0a558SYan, Zheng */ 38244a92b1b8SJosef Bacik ret = btrfs_block_rsv_add(rc->extent_root, rc->block_rsv, 382508e007d2SMiao Xie rc->extent_root->nodesize * 256, 382608e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 38273fd0a558SYan, Zheng if (ret) 38283fd0a558SYan, Zheng return ret; 38293fd0a558SYan, Zheng 38303fd0a558SYan, Zheng memset(&rc->cluster, 0, sizeof(rc->cluster)); 38313fd0a558SYan, Zheng rc->search_start = rc->block_group->key.objectid; 38323fd0a558SYan, Zheng rc->extents_found = 0; 38333fd0a558SYan, Zheng rc->nodes_relocated = 0; 38343fd0a558SYan, Zheng rc->merging_rsv_size = 0; 38353fd0a558SYan, Zheng 38363fd0a558SYan, Zheng rc->create_reloc_tree = 1; 38373fd0a558SYan, Zheng set_reloc_control(rc); 38383fd0a558SYan, Zheng 38397a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 384028818947SLiu Bo if (IS_ERR(trans)) { 384128818947SLiu Bo unset_reloc_control(rc); 384228818947SLiu Bo /* 384328818947SLiu Bo * extent tree is not a ref_cow tree and has no reloc_root to 384428818947SLiu Bo * cleanup. And callers are responsible to free the above 384528818947SLiu Bo * block rsv. 384628818947SLiu Bo */ 384728818947SLiu Bo return PTR_ERR(trans); 384828818947SLiu Bo } 38493fd0a558SYan, Zheng btrfs_commit_transaction(trans, rc->extent_root); 38503fd0a558SYan, Zheng return 0; 38513fd0a558SYan, Zheng } 385276dda93cSYan, Zheng 38535d4f98a2SYan Zheng static noinline_for_stack int relocate_block_group(struct reloc_control *rc) 38545d4f98a2SYan Zheng { 38555d4f98a2SYan Zheng struct rb_root blocks = RB_ROOT; 38565d4f98a2SYan Zheng struct btrfs_key key; 38575d4f98a2SYan Zheng struct btrfs_trans_handle *trans = NULL; 38585d4f98a2SYan Zheng struct btrfs_path *path; 38595d4f98a2SYan Zheng struct btrfs_extent_item *ei; 38605d4f98a2SYan Zheng u64 flags; 38615d4f98a2SYan Zheng u32 item_size; 38625d4f98a2SYan Zheng int ret; 38635d4f98a2SYan Zheng int err = 0; 3864c87f08caSChris Mason int progress = 0; 38655d4f98a2SYan Zheng 38665d4f98a2SYan Zheng path = btrfs_alloc_path(); 38673fd0a558SYan, Zheng if (!path) 38685d4f98a2SYan Zheng return -ENOMEM; 3869026fd317SJosef Bacik path->reada = 1; 38703fd0a558SYan, Zheng 38713fd0a558SYan, Zheng ret = prepare_to_relocate(rc); 38723fd0a558SYan, Zheng if (ret) { 38733fd0a558SYan, Zheng err = ret; 38743fd0a558SYan, Zheng goto out_free; 38752423fdfbSJiri Slaby } 38765d4f98a2SYan Zheng 38775d4f98a2SYan Zheng while (1) { 3878c87f08caSChris Mason progress++; 3879a22285a6SYan, Zheng trans = btrfs_start_transaction(rc->extent_root, 0); 38800f788c58SLiu Bo if (IS_ERR(trans)) { 38810f788c58SLiu Bo err = PTR_ERR(trans); 38820f788c58SLiu Bo trans = NULL; 38830f788c58SLiu Bo break; 38840f788c58SLiu Bo } 3885c87f08caSChris Mason restart: 38863fd0a558SYan, Zheng if (update_backref_cache(trans, &rc->backref_cache)) { 38873fd0a558SYan, Zheng btrfs_end_transaction(trans, rc->extent_root); 38883fd0a558SYan, Zheng continue; 38893fd0a558SYan, Zheng } 38903fd0a558SYan, Zheng 38913fd0a558SYan, Zheng ret = find_next_extent(trans, rc, path, &key); 38925d4f98a2SYan Zheng if (ret < 0) 38935d4f98a2SYan Zheng err = ret; 38945d4f98a2SYan Zheng if (ret != 0) 38955d4f98a2SYan Zheng break; 38965d4f98a2SYan Zheng 38975d4f98a2SYan Zheng rc->extents_found++; 38985d4f98a2SYan Zheng 38995d4f98a2SYan Zheng ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 39005d4f98a2SYan Zheng struct btrfs_extent_item); 39013fd0a558SYan, Zheng item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); 39025d4f98a2SYan Zheng if (item_size >= sizeof(*ei)) { 39035d4f98a2SYan Zheng flags = btrfs_extent_flags(path->nodes[0], ei); 39045d4f98a2SYan Zheng ret = check_extent_flags(flags); 39055d4f98a2SYan Zheng BUG_ON(ret); 39065d4f98a2SYan Zheng 39075d4f98a2SYan Zheng } else { 39085d4f98a2SYan Zheng #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 39095d4f98a2SYan Zheng u64 ref_owner; 39105d4f98a2SYan Zheng int path_change = 0; 39115d4f98a2SYan Zheng 39125d4f98a2SYan Zheng BUG_ON(item_size != 39135d4f98a2SYan Zheng sizeof(struct btrfs_extent_item_v0)); 39145d4f98a2SYan Zheng ret = get_ref_objectid_v0(rc, path, &key, &ref_owner, 39155d4f98a2SYan Zheng &path_change); 39165d4f98a2SYan Zheng if (ref_owner < BTRFS_FIRST_FREE_OBJECTID) 39175d4f98a2SYan Zheng flags = BTRFS_EXTENT_FLAG_TREE_BLOCK; 39185d4f98a2SYan Zheng else 39195d4f98a2SYan Zheng flags = BTRFS_EXTENT_FLAG_DATA; 39205d4f98a2SYan Zheng 39215d4f98a2SYan Zheng if (path_change) { 3922b3b4aa74SDavid Sterba btrfs_release_path(path); 39235d4f98a2SYan Zheng 39245d4f98a2SYan Zheng path->search_commit_root = 1; 39255d4f98a2SYan Zheng path->skip_locking = 1; 39265d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, rc->extent_root, 39275d4f98a2SYan Zheng &key, path, 0, 0); 39285d4f98a2SYan Zheng if (ret < 0) { 39295d4f98a2SYan Zheng err = ret; 39305d4f98a2SYan Zheng break; 39315d4f98a2SYan Zheng } 39325d4f98a2SYan Zheng BUG_ON(ret > 0); 39335d4f98a2SYan Zheng } 39345d4f98a2SYan Zheng #else 39355d4f98a2SYan Zheng BUG(); 39365d4f98a2SYan Zheng #endif 39375d4f98a2SYan Zheng } 39385d4f98a2SYan Zheng 39395d4f98a2SYan Zheng if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 39405d4f98a2SYan Zheng ret = add_tree_block(rc, &key, path, &blocks); 39415d4f98a2SYan Zheng } else if (rc->stage == UPDATE_DATA_PTRS && 39425d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 39435d4f98a2SYan Zheng ret = add_data_references(rc, &key, path, &blocks); 39445d4f98a2SYan Zheng } else { 3945b3b4aa74SDavid Sterba btrfs_release_path(path); 39465d4f98a2SYan Zheng ret = 0; 39475d4f98a2SYan Zheng } 39485d4f98a2SYan Zheng if (ret < 0) { 39493fd0a558SYan, Zheng err = ret; 39505d4f98a2SYan Zheng break; 39515d4f98a2SYan Zheng } 39525d4f98a2SYan Zheng 39535d4f98a2SYan Zheng if (!RB_EMPTY_ROOT(&blocks)) { 39545d4f98a2SYan Zheng ret = relocate_tree_blocks(trans, rc, &blocks); 39555d4f98a2SYan Zheng if (ret < 0) { 39563fd0a558SYan, Zheng if (ret != -EAGAIN) { 39575d4f98a2SYan Zheng err = ret; 39585d4f98a2SYan Zheng break; 39595d4f98a2SYan Zheng } 39603fd0a558SYan, Zheng rc->extents_found--; 39613fd0a558SYan, Zheng rc->search_start = key.objectid; 39623fd0a558SYan, Zheng } 39635d4f98a2SYan Zheng } 39645d4f98a2SYan Zheng 396536ba022aSJosef Bacik ret = btrfs_block_rsv_check(rc->extent_root, rc->block_rsv, 5); 39663fd0a558SYan, Zheng if (ret < 0) { 39677654b724SDaniel J Blueman if (ret != -ENOSPC) { 39683fd0a558SYan, Zheng err = ret; 39693fd0a558SYan, Zheng WARN_ON(1); 39703fd0a558SYan, Zheng break; 39713fd0a558SYan, Zheng } 39723fd0a558SYan, Zheng rc->commit_transaction = 1; 39733fd0a558SYan, Zheng } 39743fd0a558SYan, Zheng 39753fd0a558SYan, Zheng if (rc->commit_transaction) { 39763fd0a558SYan, Zheng rc->commit_transaction = 0; 39773fd0a558SYan, Zheng ret = btrfs_commit_transaction(trans, rc->extent_root); 39783fd0a558SYan, Zheng BUG_ON(ret); 39793fd0a558SYan, Zheng } else { 39803fd0a558SYan, Zheng btrfs_end_transaction_throttle(trans, rc->extent_root); 3981b53d3f5dSLiu Bo btrfs_btree_balance_dirty(rc->extent_root); 39823fd0a558SYan, Zheng } 39833fd0a558SYan, Zheng trans = NULL; 39845d4f98a2SYan Zheng 39855d4f98a2SYan Zheng if (rc->stage == MOVE_DATA_EXTENTS && 39865d4f98a2SYan Zheng (flags & BTRFS_EXTENT_FLAG_DATA)) { 39875d4f98a2SYan Zheng rc->found_file_extent = 1; 39880257bb82SYan, Zheng ret = relocate_data_extent(rc->data_inode, 39893fd0a558SYan, Zheng &key, &rc->cluster); 39905d4f98a2SYan Zheng if (ret < 0) { 39915d4f98a2SYan Zheng err = ret; 39925d4f98a2SYan Zheng break; 39935d4f98a2SYan Zheng } 39945d4f98a2SYan Zheng } 39955d4f98a2SYan Zheng } 3996c87f08caSChris Mason if (trans && progress && err == -ENOSPC) { 3997c87f08caSChris Mason ret = btrfs_force_chunk_alloc(trans, rc->extent_root, 3998c87f08caSChris Mason rc->block_group->flags); 3999c87f08caSChris Mason if (ret == 0) { 4000c87f08caSChris Mason err = 0; 4001c87f08caSChris Mason progress = 0; 4002c87f08caSChris Mason goto restart; 4003c87f08caSChris Mason } 4004c87f08caSChris Mason } 40053fd0a558SYan, Zheng 4006b3b4aa74SDavid Sterba btrfs_release_path(path); 40073fd0a558SYan, Zheng clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY, 40083fd0a558SYan, Zheng GFP_NOFS); 40095d4f98a2SYan Zheng 40105d4f98a2SYan Zheng if (trans) { 40113fd0a558SYan, Zheng btrfs_end_transaction_throttle(trans, rc->extent_root); 4012b53d3f5dSLiu Bo btrfs_btree_balance_dirty(rc->extent_root); 40135d4f98a2SYan Zheng } 40145d4f98a2SYan Zheng 40150257bb82SYan, Zheng if (!err) { 40163fd0a558SYan, Zheng ret = relocate_file_extent_cluster(rc->data_inode, 40173fd0a558SYan, Zheng &rc->cluster); 40180257bb82SYan, Zheng if (ret < 0) 40190257bb82SYan, Zheng err = ret; 40200257bb82SYan, Zheng } 40210257bb82SYan, Zheng 40223fd0a558SYan, Zheng rc->create_reloc_tree = 0; 40233fd0a558SYan, Zheng set_reloc_control(rc); 40240257bb82SYan, Zheng 40253fd0a558SYan, Zheng backref_cache_cleanup(&rc->backref_cache); 40263fd0a558SYan, Zheng btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); 40275d4f98a2SYan Zheng 40283fd0a558SYan, Zheng err = prepare_to_merge(rc, err); 40295d4f98a2SYan Zheng 40305d4f98a2SYan Zheng merge_reloc_roots(rc); 40315d4f98a2SYan Zheng 40323fd0a558SYan, Zheng rc->merge_reloc_tree = 0; 40335d4f98a2SYan Zheng unset_reloc_control(rc); 40343fd0a558SYan, Zheng btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); 40355d4f98a2SYan Zheng 40365d4f98a2SYan Zheng /* get rid of pinned extents */ 40377a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 40383612b495STsutomu Itoh if (IS_ERR(trans)) 40393612b495STsutomu Itoh err = PTR_ERR(trans); 40403612b495STsutomu Itoh else 40415d4f98a2SYan Zheng btrfs_commit_transaction(trans, rc->extent_root); 40423fd0a558SYan, Zheng out_free: 40433fd0a558SYan, Zheng btrfs_free_block_rsv(rc->extent_root, rc->block_rsv); 40443fd0a558SYan, Zheng btrfs_free_path(path); 40455d4f98a2SYan Zheng return err; 40465d4f98a2SYan Zheng } 40475d4f98a2SYan Zheng 40485d4f98a2SYan Zheng static int __insert_orphan_inode(struct btrfs_trans_handle *trans, 40490257bb82SYan, Zheng struct btrfs_root *root, u64 objectid) 40505d4f98a2SYan Zheng { 40515d4f98a2SYan Zheng struct btrfs_path *path; 40525d4f98a2SYan Zheng struct btrfs_inode_item *item; 40535d4f98a2SYan Zheng struct extent_buffer *leaf; 40545d4f98a2SYan Zheng int ret; 40555d4f98a2SYan Zheng 40565d4f98a2SYan Zheng path = btrfs_alloc_path(); 40575d4f98a2SYan Zheng if (!path) 40585d4f98a2SYan Zheng return -ENOMEM; 40595d4f98a2SYan Zheng 40605d4f98a2SYan Zheng ret = btrfs_insert_empty_inode(trans, root, path, objectid); 40615d4f98a2SYan Zheng if (ret) 40625d4f98a2SYan Zheng goto out; 40635d4f98a2SYan Zheng 40645d4f98a2SYan Zheng leaf = path->nodes[0]; 40655d4f98a2SYan Zheng item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); 40665d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); 40675d4f98a2SYan Zheng btrfs_set_inode_generation(leaf, item, 1); 40680257bb82SYan, Zheng btrfs_set_inode_size(leaf, item, 0); 40695d4f98a2SYan Zheng btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); 40703fd0a558SYan, Zheng btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | 40713fd0a558SYan, Zheng BTRFS_INODE_PREALLOC); 40725d4f98a2SYan Zheng btrfs_mark_buffer_dirty(leaf); 4073b3b4aa74SDavid Sterba btrfs_release_path(path); 40745d4f98a2SYan Zheng out: 40755d4f98a2SYan Zheng btrfs_free_path(path); 40765d4f98a2SYan Zheng return ret; 40775d4f98a2SYan Zheng } 40785d4f98a2SYan Zheng 40795d4f98a2SYan Zheng /* 40805d4f98a2SYan Zheng * helper to create inode for data relocation. 40815d4f98a2SYan Zheng * the inode is in data relocation tree and its link count is 0 40825d4f98a2SYan Zheng */ 40833fd0a558SYan, Zheng static noinline_for_stack 40843fd0a558SYan, Zheng struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, 40855d4f98a2SYan Zheng struct btrfs_block_group_cache *group) 40865d4f98a2SYan Zheng { 40875d4f98a2SYan Zheng struct inode *inode = NULL; 40885d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 40895d4f98a2SYan Zheng struct btrfs_root *root; 40905d4f98a2SYan Zheng struct btrfs_key key; 40915d4f98a2SYan Zheng u64 objectid = BTRFS_FIRST_FREE_OBJECTID; 40925d4f98a2SYan Zheng int err = 0; 40935d4f98a2SYan Zheng 40945d4f98a2SYan Zheng root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); 40955d4f98a2SYan Zheng if (IS_ERR(root)) 40965d4f98a2SYan Zheng return ERR_CAST(root); 40975d4f98a2SYan Zheng 4098a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 40993fd0a558SYan, Zheng if (IS_ERR(trans)) 41003fd0a558SYan, Zheng return ERR_CAST(trans); 41015d4f98a2SYan Zheng 4102581bb050SLi Zefan err = btrfs_find_free_objectid(root, &objectid); 41035d4f98a2SYan Zheng if (err) 41045d4f98a2SYan Zheng goto out; 41055d4f98a2SYan Zheng 41060257bb82SYan, Zheng err = __insert_orphan_inode(trans, root, objectid); 41075d4f98a2SYan Zheng BUG_ON(err); 41085d4f98a2SYan Zheng 41095d4f98a2SYan Zheng key.objectid = objectid; 41105d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 41115d4f98a2SYan Zheng key.offset = 0; 411273f73415SJosef Bacik inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); 41135d4f98a2SYan Zheng BUG_ON(IS_ERR(inode) || is_bad_inode(inode)); 41145d4f98a2SYan Zheng BTRFS_I(inode)->index_cnt = group->key.objectid; 41155d4f98a2SYan Zheng 41165d4f98a2SYan Zheng err = btrfs_orphan_add(trans, inode); 41175d4f98a2SYan Zheng out: 41185d4f98a2SYan Zheng btrfs_end_transaction(trans, root); 4119b53d3f5dSLiu Bo btrfs_btree_balance_dirty(root); 41205d4f98a2SYan Zheng if (err) { 41215d4f98a2SYan Zheng if (inode) 41225d4f98a2SYan Zheng iput(inode); 41235d4f98a2SYan Zheng inode = ERR_PTR(err); 41245d4f98a2SYan Zheng } 41255d4f98a2SYan Zheng return inode; 41265d4f98a2SYan Zheng } 41275d4f98a2SYan Zheng 4128a9995eecSJosef Bacik static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) 41293fd0a558SYan, Zheng { 41303fd0a558SYan, Zheng struct reloc_control *rc; 41313fd0a558SYan, Zheng 41323fd0a558SYan, Zheng rc = kzalloc(sizeof(*rc), GFP_NOFS); 41333fd0a558SYan, Zheng if (!rc) 41343fd0a558SYan, Zheng return NULL; 41353fd0a558SYan, Zheng 41363fd0a558SYan, Zheng INIT_LIST_HEAD(&rc->reloc_roots); 41373fd0a558SYan, Zheng backref_cache_init(&rc->backref_cache); 41383fd0a558SYan, Zheng mapping_tree_init(&rc->reloc_root_tree); 4139a9995eecSJosef Bacik extent_io_tree_init(&rc->processed_blocks, 4140a9995eecSJosef Bacik fs_info->btree_inode->i_mapping); 41413fd0a558SYan, Zheng return rc; 41423fd0a558SYan, Zheng } 41433fd0a558SYan, Zheng 41445d4f98a2SYan Zheng /* 41455d4f98a2SYan Zheng * function to relocate all extents in a block group. 41465d4f98a2SYan Zheng */ 41475d4f98a2SYan Zheng int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) 41485d4f98a2SYan Zheng { 41495d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = extent_root->fs_info; 41505d4f98a2SYan Zheng struct reloc_control *rc; 41510af3d00bSJosef Bacik struct inode *inode; 41520af3d00bSJosef Bacik struct btrfs_path *path; 41535d4f98a2SYan Zheng int ret; 4154f0486c68SYan, Zheng int rw = 0; 41555d4f98a2SYan Zheng int err = 0; 41565d4f98a2SYan Zheng 4157a9995eecSJosef Bacik rc = alloc_reloc_control(fs_info); 41585d4f98a2SYan Zheng if (!rc) 41595d4f98a2SYan Zheng return -ENOMEM; 41605d4f98a2SYan Zheng 4161f0486c68SYan, Zheng rc->extent_root = extent_root; 41623fd0a558SYan, Zheng 41635d4f98a2SYan Zheng rc->block_group = btrfs_lookup_block_group(fs_info, group_start); 41645d4f98a2SYan Zheng BUG_ON(!rc->block_group); 41655d4f98a2SYan Zheng 4166f0486c68SYan, Zheng if (!rc->block_group->ro) { 4167f0486c68SYan, Zheng ret = btrfs_set_block_group_ro(extent_root, rc->block_group); 4168f0486c68SYan, Zheng if (ret) { 4169f0486c68SYan, Zheng err = ret; 4170f0486c68SYan, Zheng goto out; 4171f0486c68SYan, Zheng } 4172f0486c68SYan, Zheng rw = 1; 4173f0486c68SYan, Zheng } 4174f0486c68SYan, Zheng 41750af3d00bSJosef Bacik path = btrfs_alloc_path(); 41760af3d00bSJosef Bacik if (!path) { 41770af3d00bSJosef Bacik err = -ENOMEM; 41780af3d00bSJosef Bacik goto out; 41790af3d00bSJosef Bacik } 41800af3d00bSJosef Bacik 41810af3d00bSJosef Bacik inode = lookup_free_space_inode(fs_info->tree_root, rc->block_group, 41820af3d00bSJosef Bacik path); 41830af3d00bSJosef Bacik btrfs_free_path(path); 41840af3d00bSJosef Bacik 41850af3d00bSJosef Bacik if (!IS_ERR(inode)) 41860af3d00bSJosef Bacik ret = delete_block_group_cache(fs_info, inode, 0); 41870af3d00bSJosef Bacik else 41880af3d00bSJosef Bacik ret = PTR_ERR(inode); 41890af3d00bSJosef Bacik 41900af3d00bSJosef Bacik if (ret && ret != -ENOENT) { 41910af3d00bSJosef Bacik err = ret; 41920af3d00bSJosef Bacik goto out; 41930af3d00bSJosef Bacik } 41940af3d00bSJosef Bacik 41955d4f98a2SYan Zheng rc->data_inode = create_reloc_inode(fs_info, rc->block_group); 41965d4f98a2SYan Zheng if (IS_ERR(rc->data_inode)) { 41975d4f98a2SYan Zheng err = PTR_ERR(rc->data_inode); 41985d4f98a2SYan Zheng rc->data_inode = NULL; 41995d4f98a2SYan Zheng goto out; 42005d4f98a2SYan Zheng } 42015d4f98a2SYan Zheng 42025d4f98a2SYan Zheng printk(KERN_INFO "btrfs: relocating block group %llu flags %llu\n", 42035d4f98a2SYan Zheng (unsigned long long)rc->block_group->key.objectid, 42045d4f98a2SYan Zheng (unsigned long long)rc->block_group->flags); 42055d4f98a2SYan Zheng 4206eb73c1b7SMiao Xie ret = btrfs_start_all_delalloc_inodes(fs_info, 0); 42078ccf6f19SMiao Xie if (ret < 0) { 42088ccf6f19SMiao Xie err = ret; 42098ccf6f19SMiao Xie goto out; 42108ccf6f19SMiao Xie } 4211199c2a9cSMiao Xie btrfs_wait_all_ordered_extents(fs_info, 0); 42125d4f98a2SYan Zheng 42135d4f98a2SYan Zheng while (1) { 421476dda93cSYan, Zheng mutex_lock(&fs_info->cleaner_mutex); 42155d4f98a2SYan Zheng ret = relocate_block_group(rc); 421676dda93cSYan, Zheng mutex_unlock(&fs_info->cleaner_mutex); 42175d4f98a2SYan Zheng if (ret < 0) { 42185d4f98a2SYan Zheng err = ret; 42193fd0a558SYan, Zheng goto out; 42205d4f98a2SYan Zheng } 42215d4f98a2SYan Zheng 42225d4f98a2SYan Zheng if (rc->extents_found == 0) 42235d4f98a2SYan Zheng break; 42245d4f98a2SYan Zheng 42255d4f98a2SYan Zheng printk(KERN_INFO "btrfs: found %llu extents\n", 42265d4f98a2SYan Zheng (unsigned long long)rc->extents_found); 42275d4f98a2SYan Zheng 42285d4f98a2SYan Zheng if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { 42295d4f98a2SYan Zheng btrfs_wait_ordered_range(rc->data_inode, 0, (u64)-1); 42305d4f98a2SYan Zheng invalidate_mapping_pages(rc->data_inode->i_mapping, 42315d4f98a2SYan Zheng 0, -1); 42325d4f98a2SYan Zheng rc->stage = UPDATE_DATA_PTRS; 42335d4f98a2SYan Zheng } 42345d4f98a2SYan Zheng } 42355d4f98a2SYan Zheng 42360257bb82SYan, Zheng filemap_write_and_wait_range(fs_info->btree_inode->i_mapping, 42375d4f98a2SYan Zheng rc->block_group->key.objectid, 42385d4f98a2SYan Zheng rc->block_group->key.objectid + 42395d4f98a2SYan Zheng rc->block_group->key.offset - 1); 42405d4f98a2SYan Zheng 42415d4f98a2SYan Zheng WARN_ON(rc->block_group->pinned > 0); 42425d4f98a2SYan Zheng WARN_ON(rc->block_group->reserved > 0); 42435d4f98a2SYan Zheng WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); 42445d4f98a2SYan Zheng out: 4245f0486c68SYan, Zheng if (err && rw) 4246f0486c68SYan, Zheng btrfs_set_block_group_rw(extent_root, rc->block_group); 42475d4f98a2SYan Zheng iput(rc->data_inode); 42485d4f98a2SYan Zheng btrfs_put_block_group(rc->block_group); 42495d4f98a2SYan Zheng kfree(rc); 42505d4f98a2SYan Zheng return err; 42515d4f98a2SYan Zheng } 42525d4f98a2SYan Zheng 425376dda93cSYan, Zheng static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) 425476dda93cSYan, Zheng { 425576dda93cSYan, Zheng struct btrfs_trans_handle *trans; 425679787eaaSJeff Mahoney int ret, err; 425776dda93cSYan, Zheng 4258a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->tree_root, 0); 425979787eaaSJeff Mahoney if (IS_ERR(trans)) 426079787eaaSJeff Mahoney return PTR_ERR(trans); 426176dda93cSYan, Zheng 426276dda93cSYan, Zheng memset(&root->root_item.drop_progress, 0, 426376dda93cSYan, Zheng sizeof(root->root_item.drop_progress)); 426476dda93cSYan, Zheng root->root_item.drop_level = 0; 426576dda93cSYan, Zheng btrfs_set_root_refs(&root->root_item, 0); 426676dda93cSYan, Zheng ret = btrfs_update_root(trans, root->fs_info->tree_root, 426776dda93cSYan, Zheng &root->root_key, &root->root_item); 426876dda93cSYan, Zheng 426979787eaaSJeff Mahoney err = btrfs_end_transaction(trans, root->fs_info->tree_root); 427079787eaaSJeff Mahoney if (err) 427179787eaaSJeff Mahoney return err; 427279787eaaSJeff Mahoney return ret; 427376dda93cSYan, Zheng } 427476dda93cSYan, Zheng 42755d4f98a2SYan Zheng /* 42765d4f98a2SYan Zheng * recover relocation interrupted by system crash. 42775d4f98a2SYan Zheng * 42785d4f98a2SYan Zheng * this function resumes merging reloc trees with corresponding fs trees. 42795d4f98a2SYan Zheng * this is important for keeping the sharing of tree blocks 42805d4f98a2SYan Zheng */ 42815d4f98a2SYan Zheng int btrfs_recover_relocation(struct btrfs_root *root) 42825d4f98a2SYan Zheng { 42835d4f98a2SYan Zheng LIST_HEAD(reloc_roots); 42845d4f98a2SYan Zheng struct btrfs_key key; 42855d4f98a2SYan Zheng struct btrfs_root *fs_root; 42865d4f98a2SYan Zheng struct btrfs_root *reloc_root; 42875d4f98a2SYan Zheng struct btrfs_path *path; 42885d4f98a2SYan Zheng struct extent_buffer *leaf; 42895d4f98a2SYan Zheng struct reloc_control *rc = NULL; 42905d4f98a2SYan Zheng struct btrfs_trans_handle *trans; 42915d4f98a2SYan Zheng int ret; 42925d4f98a2SYan Zheng int err = 0; 42935d4f98a2SYan Zheng 42945d4f98a2SYan Zheng path = btrfs_alloc_path(); 42955d4f98a2SYan Zheng if (!path) 42965d4f98a2SYan Zheng return -ENOMEM; 4297026fd317SJosef Bacik path->reada = -1; 42985d4f98a2SYan Zheng 42995d4f98a2SYan Zheng key.objectid = BTRFS_TREE_RELOC_OBJECTID; 43005d4f98a2SYan Zheng key.type = BTRFS_ROOT_ITEM_KEY; 43015d4f98a2SYan Zheng key.offset = (u64)-1; 43025d4f98a2SYan Zheng 43035d4f98a2SYan Zheng while (1) { 43045d4f98a2SYan Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, 43055d4f98a2SYan Zheng path, 0, 0); 43065d4f98a2SYan Zheng if (ret < 0) { 43075d4f98a2SYan Zheng err = ret; 43085d4f98a2SYan Zheng goto out; 43095d4f98a2SYan Zheng } 43105d4f98a2SYan Zheng if (ret > 0) { 43115d4f98a2SYan Zheng if (path->slots[0] == 0) 43125d4f98a2SYan Zheng break; 43135d4f98a2SYan Zheng path->slots[0]--; 43145d4f98a2SYan Zheng } 43155d4f98a2SYan Zheng leaf = path->nodes[0]; 43165d4f98a2SYan Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 4317b3b4aa74SDavid Sterba btrfs_release_path(path); 43185d4f98a2SYan Zheng 43195d4f98a2SYan Zheng if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || 43205d4f98a2SYan Zheng key.type != BTRFS_ROOT_ITEM_KEY) 43215d4f98a2SYan Zheng break; 43225d4f98a2SYan Zheng 4323cb517eabSMiao Xie reloc_root = btrfs_read_fs_root(root, &key); 43245d4f98a2SYan Zheng if (IS_ERR(reloc_root)) { 43255d4f98a2SYan Zheng err = PTR_ERR(reloc_root); 43265d4f98a2SYan Zheng goto out; 43275d4f98a2SYan Zheng } 43285d4f98a2SYan Zheng 43295d4f98a2SYan Zheng list_add(&reloc_root->root_list, &reloc_roots); 43305d4f98a2SYan Zheng 43315d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) > 0) { 43325d4f98a2SYan Zheng fs_root = read_fs_root(root->fs_info, 43335d4f98a2SYan Zheng reloc_root->root_key.offset); 43345d4f98a2SYan Zheng if (IS_ERR(fs_root)) { 433576dda93cSYan, Zheng ret = PTR_ERR(fs_root); 433676dda93cSYan, Zheng if (ret != -ENOENT) { 433776dda93cSYan, Zheng err = ret; 43385d4f98a2SYan Zheng goto out; 43395d4f98a2SYan Zheng } 434079787eaaSJeff Mahoney ret = mark_garbage_root(reloc_root); 434179787eaaSJeff Mahoney if (ret < 0) { 434279787eaaSJeff Mahoney err = ret; 434379787eaaSJeff Mahoney goto out; 434479787eaaSJeff Mahoney } 434576dda93cSYan, Zheng } 43465d4f98a2SYan Zheng } 43475d4f98a2SYan Zheng 43485d4f98a2SYan Zheng if (key.offset == 0) 43495d4f98a2SYan Zheng break; 43505d4f98a2SYan Zheng 43515d4f98a2SYan Zheng key.offset--; 43525d4f98a2SYan Zheng } 4353b3b4aa74SDavid Sterba btrfs_release_path(path); 43545d4f98a2SYan Zheng 43555d4f98a2SYan Zheng if (list_empty(&reloc_roots)) 43565d4f98a2SYan Zheng goto out; 43575d4f98a2SYan Zheng 4358a9995eecSJosef Bacik rc = alloc_reloc_control(root->fs_info); 43595d4f98a2SYan Zheng if (!rc) { 43605d4f98a2SYan Zheng err = -ENOMEM; 43615d4f98a2SYan Zheng goto out; 43625d4f98a2SYan Zheng } 43635d4f98a2SYan Zheng 43645d4f98a2SYan Zheng rc->extent_root = root->fs_info->extent_root; 43655d4f98a2SYan Zheng 43665d4f98a2SYan Zheng set_reloc_control(rc); 43675d4f98a2SYan Zheng 43687a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 43693612b495STsutomu Itoh if (IS_ERR(trans)) { 43703612b495STsutomu Itoh unset_reloc_control(rc); 43713612b495STsutomu Itoh err = PTR_ERR(trans); 43723612b495STsutomu Itoh goto out_free; 43733612b495STsutomu Itoh } 43743fd0a558SYan, Zheng 43753fd0a558SYan, Zheng rc->merge_reloc_tree = 1; 43763fd0a558SYan, Zheng 43775d4f98a2SYan Zheng while (!list_empty(&reloc_roots)) { 43785d4f98a2SYan Zheng reloc_root = list_entry(reloc_roots.next, 43795d4f98a2SYan Zheng struct btrfs_root, root_list); 43805d4f98a2SYan Zheng list_del(&reloc_root->root_list); 43815d4f98a2SYan Zheng 43825d4f98a2SYan Zheng if (btrfs_root_refs(&reloc_root->root_item) == 0) { 43835d4f98a2SYan Zheng list_add_tail(&reloc_root->root_list, 43845d4f98a2SYan Zheng &rc->reloc_roots); 43855d4f98a2SYan Zheng continue; 43865d4f98a2SYan Zheng } 43875d4f98a2SYan Zheng 43885d4f98a2SYan Zheng fs_root = read_fs_root(root->fs_info, 43895d4f98a2SYan Zheng reloc_root->root_key.offset); 439079787eaaSJeff Mahoney if (IS_ERR(fs_root)) { 439179787eaaSJeff Mahoney err = PTR_ERR(fs_root); 439279787eaaSJeff Mahoney goto out_free; 439379787eaaSJeff Mahoney } 43945d4f98a2SYan Zheng 4395ffd7b339SJeff Mahoney err = __add_reloc_root(reloc_root); 439679787eaaSJeff Mahoney BUG_ON(err < 0); /* -ENOMEM or logic error */ 43975d4f98a2SYan Zheng fs_root->reloc_root = reloc_root; 43985d4f98a2SYan Zheng } 43995d4f98a2SYan Zheng 440079787eaaSJeff Mahoney err = btrfs_commit_transaction(trans, rc->extent_root); 440179787eaaSJeff Mahoney if (err) 440279787eaaSJeff Mahoney goto out_free; 44035d4f98a2SYan Zheng 44045d4f98a2SYan Zheng merge_reloc_roots(rc); 44055d4f98a2SYan Zheng 44065d4f98a2SYan Zheng unset_reloc_control(rc); 44075d4f98a2SYan Zheng 44087a7eaa40SJosef Bacik trans = btrfs_join_transaction(rc->extent_root); 44093612b495STsutomu Itoh if (IS_ERR(trans)) 44103612b495STsutomu Itoh err = PTR_ERR(trans); 44113612b495STsutomu Itoh else 441279787eaaSJeff Mahoney err = btrfs_commit_transaction(trans, rc->extent_root); 44133612b495STsutomu Itoh out_free: 44145d4f98a2SYan Zheng kfree(rc); 44153612b495STsutomu Itoh out: 4416aca1bba6SLiu Bo if (!list_empty(&reloc_roots)) 4417aca1bba6SLiu Bo free_reloc_roots(&reloc_roots); 4418aca1bba6SLiu Bo 44195d4f98a2SYan Zheng btrfs_free_path(path); 44205d4f98a2SYan Zheng 44215d4f98a2SYan Zheng if (err == 0) { 44225d4f98a2SYan Zheng /* cleanup orphan inode in data relocation tree */ 44235d4f98a2SYan Zheng fs_root = read_fs_root(root->fs_info, 44245d4f98a2SYan Zheng BTRFS_DATA_RELOC_TREE_OBJECTID); 44255d4f98a2SYan Zheng if (IS_ERR(fs_root)) 44265d4f98a2SYan Zheng err = PTR_ERR(fs_root); 4427d7ce5843SMiao Xie else 442866b4ffd1SJosef Bacik err = btrfs_orphan_cleanup(fs_root); 44295d4f98a2SYan Zheng } 44305d4f98a2SYan Zheng return err; 44315d4f98a2SYan Zheng } 44325d4f98a2SYan Zheng 44335d4f98a2SYan Zheng /* 44345d4f98a2SYan Zheng * helper to add ordered checksum for data relocation. 44355d4f98a2SYan Zheng * 44365d4f98a2SYan Zheng * cloning checksum properly handles the nodatasum extents. 44375d4f98a2SYan Zheng * it also saves CPU time to re-calculate the checksum. 44385d4f98a2SYan Zheng */ 44395d4f98a2SYan Zheng int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) 44405d4f98a2SYan Zheng { 44415d4f98a2SYan Zheng struct btrfs_ordered_sum *sums; 44425d4f98a2SYan Zheng struct btrfs_sector_sum *sector_sum; 44435d4f98a2SYan Zheng struct btrfs_ordered_extent *ordered; 44445d4f98a2SYan Zheng struct btrfs_root *root = BTRFS_I(inode)->root; 44455d4f98a2SYan Zheng size_t offset; 44465d4f98a2SYan Zheng int ret; 44475d4f98a2SYan Zheng u64 disk_bytenr; 44485d4f98a2SYan Zheng LIST_HEAD(list); 44495d4f98a2SYan Zheng 44505d4f98a2SYan Zheng ordered = btrfs_lookup_ordered_extent(inode, file_pos); 44515d4f98a2SYan Zheng BUG_ON(ordered->file_offset != file_pos || ordered->len != len); 44525d4f98a2SYan Zheng 44535d4f98a2SYan Zheng disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; 44545d4f98a2SYan Zheng ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, 4455a2de733cSArne Jansen disk_bytenr + len - 1, &list, 0); 445679787eaaSJeff Mahoney if (ret) 445779787eaaSJeff Mahoney goto out; 44585d4f98a2SYan Zheng 44595d4f98a2SYan Zheng while (!list_empty(&list)) { 44605d4f98a2SYan Zheng sums = list_entry(list.next, struct btrfs_ordered_sum, list); 44615d4f98a2SYan Zheng list_del_init(&sums->list); 44625d4f98a2SYan Zheng 44635d4f98a2SYan Zheng sector_sum = sums->sums; 44645d4f98a2SYan Zheng sums->bytenr = ordered->start; 44655d4f98a2SYan Zheng 44665d4f98a2SYan Zheng offset = 0; 44675d4f98a2SYan Zheng while (offset < sums->len) { 44685d4f98a2SYan Zheng sector_sum->bytenr += ordered->start - disk_bytenr; 44695d4f98a2SYan Zheng sector_sum++; 44705d4f98a2SYan Zheng offset += root->sectorsize; 44715d4f98a2SYan Zheng } 44725d4f98a2SYan Zheng 44735d4f98a2SYan Zheng btrfs_add_ordered_sum(inode, ordered, sums); 44745d4f98a2SYan Zheng } 447579787eaaSJeff Mahoney out: 44765d4f98a2SYan Zheng btrfs_put_ordered_extent(ordered); 4477411fc6bcSAndi Kleen return ret; 44785d4f98a2SYan Zheng } 44793fd0a558SYan, Zheng 44803fd0a558SYan, Zheng void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 44813fd0a558SYan, Zheng struct btrfs_root *root, struct extent_buffer *buf, 44823fd0a558SYan, Zheng struct extent_buffer *cow) 44833fd0a558SYan, Zheng { 44843fd0a558SYan, Zheng struct reloc_control *rc; 44853fd0a558SYan, Zheng struct backref_node *node; 44863fd0a558SYan, Zheng int first_cow = 0; 44873fd0a558SYan, Zheng int level; 44883fd0a558SYan, Zheng int ret; 44893fd0a558SYan, Zheng 44903fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 44913fd0a558SYan, Zheng if (!rc) 44923fd0a558SYan, Zheng return; 44933fd0a558SYan, Zheng 44943fd0a558SYan, Zheng BUG_ON(rc->stage == UPDATE_DATA_PTRS && 44953fd0a558SYan, Zheng root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); 44963fd0a558SYan, Zheng 44973fd0a558SYan, Zheng level = btrfs_header_level(buf); 44983fd0a558SYan, Zheng if (btrfs_header_generation(buf) <= 44993fd0a558SYan, Zheng btrfs_root_last_snapshot(&root->root_item)) 45003fd0a558SYan, Zheng first_cow = 1; 45013fd0a558SYan, Zheng 45023fd0a558SYan, Zheng if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && 45033fd0a558SYan, Zheng rc->create_reloc_tree) { 45043fd0a558SYan, Zheng WARN_ON(!first_cow && level == 0); 45053fd0a558SYan, Zheng 45063fd0a558SYan, Zheng node = rc->backref_cache.path[level]; 45073fd0a558SYan, Zheng BUG_ON(node->bytenr != buf->start && 45083fd0a558SYan, Zheng node->new_bytenr != buf->start); 45093fd0a558SYan, Zheng 45103fd0a558SYan, Zheng drop_node_buffer(node); 45113fd0a558SYan, Zheng extent_buffer_get(cow); 45123fd0a558SYan, Zheng node->eb = cow; 45133fd0a558SYan, Zheng node->new_bytenr = cow->start; 45143fd0a558SYan, Zheng 45153fd0a558SYan, Zheng if (!node->pending) { 45163fd0a558SYan, Zheng list_move_tail(&node->list, 45173fd0a558SYan, Zheng &rc->backref_cache.pending[level]); 45183fd0a558SYan, Zheng node->pending = 1; 45193fd0a558SYan, Zheng } 45203fd0a558SYan, Zheng 45213fd0a558SYan, Zheng if (first_cow) 45223fd0a558SYan, Zheng __mark_block_processed(rc, node); 45233fd0a558SYan, Zheng 45243fd0a558SYan, Zheng if (first_cow && level > 0) 45253fd0a558SYan, Zheng rc->nodes_relocated += buf->len; 45263fd0a558SYan, Zheng } 45273fd0a558SYan, Zheng 45283fd0a558SYan, Zheng if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) { 45293fd0a558SYan, Zheng ret = replace_file_extents(trans, rc, root, cow); 45303fd0a558SYan, Zheng BUG_ON(ret); 45313fd0a558SYan, Zheng } 45323fd0a558SYan, Zheng } 45333fd0a558SYan, Zheng 45343fd0a558SYan, Zheng /* 45353fd0a558SYan, Zheng * called before creating snapshot. it calculates metadata reservation 45363fd0a558SYan, Zheng * requried for relocating tree blocks in the snapshot 45373fd0a558SYan, Zheng */ 45383fd0a558SYan, Zheng void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans, 45393fd0a558SYan, Zheng struct btrfs_pending_snapshot *pending, 45403fd0a558SYan, Zheng u64 *bytes_to_reserve) 45413fd0a558SYan, Zheng { 45423fd0a558SYan, Zheng struct btrfs_root *root; 45433fd0a558SYan, Zheng struct reloc_control *rc; 45443fd0a558SYan, Zheng 45453fd0a558SYan, Zheng root = pending->root; 45463fd0a558SYan, Zheng if (!root->reloc_root) 45473fd0a558SYan, Zheng return; 45483fd0a558SYan, Zheng 45493fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 45503fd0a558SYan, Zheng if (!rc->merge_reloc_tree) 45513fd0a558SYan, Zheng return; 45523fd0a558SYan, Zheng 45533fd0a558SYan, Zheng root = root->reloc_root; 45543fd0a558SYan, Zheng BUG_ON(btrfs_root_refs(&root->root_item) == 0); 45553fd0a558SYan, Zheng /* 45563fd0a558SYan, Zheng * relocation is in the stage of merging trees. the space 45573fd0a558SYan, Zheng * used by merging a reloc tree is twice the size of 45583fd0a558SYan, Zheng * relocated tree nodes in the worst case. half for cowing 45593fd0a558SYan, Zheng * the reloc tree, half for cowing the fs tree. the space 45603fd0a558SYan, Zheng * used by cowing the reloc tree will be freed after the 45613fd0a558SYan, Zheng * tree is dropped. if we create snapshot, cowing the fs 45623fd0a558SYan, Zheng * tree may use more space than it frees. so we need 45633fd0a558SYan, Zheng * reserve extra space. 45643fd0a558SYan, Zheng */ 45653fd0a558SYan, Zheng *bytes_to_reserve += rc->nodes_relocated; 45663fd0a558SYan, Zheng } 45673fd0a558SYan, Zheng 45683fd0a558SYan, Zheng /* 45693fd0a558SYan, Zheng * called after snapshot is created. migrate block reservation 45703fd0a558SYan, Zheng * and create reloc root for the newly created snapshot 45713fd0a558SYan, Zheng */ 457249b25e05SJeff Mahoney int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 45733fd0a558SYan, Zheng struct btrfs_pending_snapshot *pending) 45743fd0a558SYan, Zheng { 45753fd0a558SYan, Zheng struct btrfs_root *root = pending->root; 45763fd0a558SYan, Zheng struct btrfs_root *reloc_root; 45773fd0a558SYan, Zheng struct btrfs_root *new_root; 45783fd0a558SYan, Zheng struct reloc_control *rc; 45793fd0a558SYan, Zheng int ret; 45803fd0a558SYan, Zheng 45813fd0a558SYan, Zheng if (!root->reloc_root) 458249b25e05SJeff Mahoney return 0; 45833fd0a558SYan, Zheng 45843fd0a558SYan, Zheng rc = root->fs_info->reloc_ctl; 45853fd0a558SYan, Zheng rc->merging_rsv_size += rc->nodes_relocated; 45863fd0a558SYan, Zheng 45873fd0a558SYan, Zheng if (rc->merge_reloc_tree) { 45883fd0a558SYan, Zheng ret = btrfs_block_rsv_migrate(&pending->block_rsv, 45893fd0a558SYan, Zheng rc->block_rsv, 45903fd0a558SYan, Zheng rc->nodes_relocated); 459149b25e05SJeff Mahoney if (ret) 459249b25e05SJeff Mahoney return ret; 45933fd0a558SYan, Zheng } 45943fd0a558SYan, Zheng 45953fd0a558SYan, Zheng new_root = pending->snap; 45963fd0a558SYan, Zheng reloc_root = create_reloc_root(trans, root->reloc_root, 45973fd0a558SYan, Zheng new_root->root_key.objectid); 459849b25e05SJeff Mahoney if (IS_ERR(reloc_root)) 459949b25e05SJeff Mahoney return PTR_ERR(reloc_root); 46003fd0a558SYan, Zheng 4601ffd7b339SJeff Mahoney ret = __add_reloc_root(reloc_root); 4602ffd7b339SJeff Mahoney BUG_ON(ret < 0); 46033fd0a558SYan, Zheng new_root->reloc_root = reloc_root; 46043fd0a558SYan, Zheng 460549b25e05SJeff Mahoney if (rc->create_reloc_tree) 46063fd0a558SYan, Zheng ret = clone_backref_node(trans, rc, root, reloc_root); 460749b25e05SJeff Mahoney return ret; 46083fd0a558SYan, Zheng } 4609