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bc44d7c4b2
linux/fs/btrfs/relocation.c
Josef Bacik bc44d7c4b2 btrfs: push btrfs_grab_fs_root into btrfs_get_fs_root 
Now that all callers of btrfs_get_fs_root are subsequently calling
btrfs_grab_fs_root and handling dropping the ref when they are done
appropriately, go ahead and push btrfs_grab_fs_root up into
btrfs_get_fs_root.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2020-03-23 17:01:32 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2009 Oracle. All rights reserved.
*/
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "volumes.h"
#include "locking.h"
#include "btrfs_inode.h"
#include "async-thread.h"
#include "free-space-cache.h"
#include "inode-map.h"
#include "qgroup.h"
#include "print-tree.h"
#include "delalloc-space.h"
#include "block-group.h"
/*
* Relocation overview
*
* [What does relocation do]
*
* The objective of relocation is to relocate all extents of the target block
* group to other block groups.
* This is utilized by resize (shrink only), profile converting, compacting
* space, or balance routine to spread chunks over devices.
*
* Before | After
* ------------------------------------------------------------------
* BG A: 10 data extents | BG A: deleted
* BG B: 2 data extents | BG B: 10 data extents (2 old + 8 relocated)
* BG C: 1 extents | BG C: 3 data extents (1 old + 2 relocated)
*
* [How does relocation work]
*
* 1. Mark the target block group read-only
* New extents won't be allocated from the target block group.
*
* 2.1 Record each extent in the target block group
* To build a proper map of extents to be relocated.
*
* 2.2 Build data reloc tree and reloc trees
* Data reloc tree will contain an inode, recording all newly relocated
* data extents.
* There will be only one data reloc tree for one data block group.
*
* Reloc tree will be a special snapshot of its source tree, containing
* relocated tree blocks.
* Each tree referring to a tree block in target block group will get its
* reloc tree built.
*
* 2.3 Swap source tree with its corresponding reloc tree
* Each involved tree only refers to new extents after swap.
*
* 3. Cleanup reloc trees and data reloc tree.
* As old extents in the target block group are still referenced by reloc
* trees, we need to clean them up before really freeing the target block
* group.
*
* The main complexity is in steps 2.2 and 2.3.
*
* The entry point of relocation is relocate_block_group() function.
*/
/*
* backref_node, mapping_node and tree_block start with this
*/
struct tree_entry {
struct rb_node rb_node;
u64 bytenr;
};
/*
* present a tree block in the backref cache
*/
struct backref_node {
struct rb_node rb_node;
u64 bytenr;
u64 new_bytenr;
/* objectid of tree block owner, can be not uptodate */
u64 owner;
/* link to pending, changed or detached list */
struct list_head list;
/* list of upper level blocks reference this block */
struct list_head upper;
/* list of child blocks in the cache */
struct list_head lower;
/* NULL if this node is not tree root */
struct btrfs_root *root;
/* extent buffer got by COW the block */
struct extent_buffer *eb;
/* level of tree block */
unsigned int level:8;
/* is the block in non-reference counted tree */
unsigned int cowonly:1;
/* 1 if no child node in the cache */
unsigned int lowest:1;
/* is the extent buffer locked */
unsigned int locked:1;
/* has the block been processed */
unsigned int processed:1;
/* have backrefs of this block been checked */
unsigned int checked:1;
/*
* 1 if corresponding block has been cowed but some upper
* level block pointers may not point to the new location
*/
unsigned int pending:1;
/*
* 1 if the backref node isn't connected to any other
* backref node.
*/
unsigned int detached:1;
};
/*
* present a block pointer in the backref cache
*/
struct backref_edge {
struct list_head list[2];
struct backref_node *node[2];
};
#define LOWER 0
#define UPPER 1
#define RELOCATION_RESERVED_NODES 256
struct backref_cache {
/* red black tree of all backref nodes in the cache */
struct rb_root rb_root;
/* for passing backref nodes to btrfs_reloc_cow_block */
struct backref_node *path[BTRFS_MAX_LEVEL];
/*
* list of blocks that have been cowed but some block
* pointers in upper level blocks may not reflect the
* new location
*/
struct list_head pending[BTRFS_MAX_LEVEL];
/* list of backref nodes with no child node */
struct list_head leaves;
/* list of blocks that have been cowed in current transaction */
struct list_head changed;
/* list of detached backref node. */
struct list_head detached;
u64 last_trans;
int nr_nodes;
int nr_edges;
};
/*
* map address of tree root to tree
*/
struct mapping_node {
struct rb_node rb_node;
u64 bytenr;
void *data;
};
struct mapping_tree {
struct rb_root rb_root;
spinlock_t lock;
};
/*
* present a tree block to process
*/
struct tree_block {
struct rb_node rb_node;
u64 bytenr;
struct btrfs_key key;
unsigned int level:8;
unsigned int key_ready:1;
};
#define MAX_EXTENTS 128
struct file_extent_cluster {
u64 start;
u64 end;
u64 boundary[MAX_EXTENTS];
unsigned int nr;
};
struct reloc_control {
/* block group to relocate */
struct btrfs_block_group *block_group;
/* extent tree */
struct btrfs_root *extent_root;
/* inode for moving data */
struct inode *data_inode;
struct btrfs_block_rsv *block_rsv;
struct backref_cache backref_cache;
struct file_extent_cluster cluster;
/* tree blocks have been processed */
struct extent_io_tree processed_blocks;
/* map start of tree root to corresponding reloc tree */
struct mapping_tree reloc_root_tree;
/* list of reloc trees */
struct list_head reloc_roots;
/* list of subvolume trees that get relocated */
struct list_head dirty_subvol_roots;
/* size of metadata reservation for merging reloc trees */
u64 merging_rsv_size;
/* size of relocated tree nodes */
u64 nodes_relocated;
/* reserved size for block group relocation*/
u64 reserved_bytes;
u64 search_start;
u64 extents_found;
unsigned int stage:8;
unsigned int create_reloc_tree:1;
unsigned int merge_reloc_tree:1;
unsigned int found_file_extent:1;
};
/* stages of data relocation */
#define MOVE_DATA_EXTENTS 0
#define UPDATE_DATA_PTRS 1
static void remove_backref_node(struct backref_cache *cache,
struct backref_node *node);
static void __mark_block_processed(struct reloc_control *rc,
struct backref_node *node);
static void mapping_tree_init(struct mapping_tree *tree)
{
tree->rb_root = RB_ROOT;
spin_lock_init(&tree->lock);
}
static void backref_cache_init(struct backref_cache *cache)
{
int i;
cache->rb_root = RB_ROOT;
for (i = 0; i < BTRFS_MAX_LEVEL; i++)
INIT_LIST_HEAD(&cache->pending[i]);
INIT_LIST_HEAD(&cache->changed);
INIT_LIST_HEAD(&cache->detached);
INIT_LIST_HEAD(&cache->leaves);
}
static void backref_cache_cleanup(struct backref_cache *cache)
{
struct backref_node *node;
int i;
while (!list_empty(&cache->detached)) {
node = list_entry(cache->detached.next,
struct backref_node, list);
remove_backref_node(cache, node);
}
while (!list_empty(&cache->leaves)) {
node = list_entry(cache->leaves.next,
struct backref_node, lower);
remove_backref_node(cache, node);
}
cache->last_trans = 0;
for (i = 0; i < BTRFS_MAX_LEVEL; i++)
ASSERT(list_empty(&cache->pending[i]));
ASSERT(list_empty(&cache->changed));
ASSERT(list_empty(&cache->detached));
ASSERT(RB_EMPTY_ROOT(&cache->rb_root));
ASSERT(!cache->nr_nodes);
ASSERT(!cache->nr_edges);
}
static struct backref_node *alloc_backref_node(struct backref_cache *cache)
{
struct backref_node *node;
node = kzalloc(sizeof(*node), GFP_NOFS);
if (node) {
INIT_LIST_HEAD(&node->list);
INIT_LIST_HEAD(&node->upper);
INIT_LIST_HEAD(&node->lower);
RB_CLEAR_NODE(&node->rb_node);
cache->nr_nodes++;
}
return node;
}
static void free_backref_node(struct backref_cache *cache,
struct backref_node *node)
{
if (node) {
cache->nr_nodes--;
btrfs_put_fs_root(node->root);
kfree(node);
}
}
static struct backref_edge *alloc_backref_edge(struct backref_cache *cache)
{
struct backref_edge *edge;
edge = kzalloc(sizeof(*edge), GFP_NOFS);
if (edge)
cache->nr_edges++;
return edge;
}
static void free_backref_edge(struct backref_cache *cache,
struct backref_edge *edge)
{
if (edge) {
cache->nr_edges--;
kfree(edge);
}
}
static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr,
struct rb_node *node)
{
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
struct tree_entry *entry;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct tree_entry, rb_node);
if (bytenr < entry->bytenr)
p = &(*p)->rb_left;
else if (bytenr > entry->bytenr)
p = &(*p)->rb_right;
else
return parent;
}
rb_link_node(node, parent, p);
rb_insert_color(node, root);
return NULL;
}
static struct rb_node *tree_search(struct rb_root *root, u64 bytenr)
{
struct rb_node *n = root->rb_node;
struct tree_entry *entry;
while (n) {
entry = rb_entry(n, struct tree_entry, rb_node);
if (bytenr < entry->bytenr)
n = n->rb_left;
else if (bytenr > entry->bytenr)
n = n->rb_right;
else
return n;
}
return NULL;
}
static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr)
{
struct btrfs_fs_info *fs_info = NULL;
struct backref_node *bnode = rb_entry(rb_node, struct backref_node,
rb_node);
if (bnode->root)
fs_info = bnode->root->fs_info;
btrfs_panic(fs_info, errno,
"Inconsistency in backref cache found at offset %llu",
bytenr);
}
/*
* walk up backref nodes until reach node presents tree root
*/
static struct backref_node *walk_up_backref(struct backref_node *node,
struct backref_edge *edges[],
int *index)
{
struct backref_edge *edge;
int idx = *index;
while (!list_empty(&node->upper)) {
edge = list_entry(node->upper.next,
struct backref_edge, list[LOWER]);
edges[idx++] = edge;
node = edge->node[UPPER];
}
BUG_ON(node->detached);
*index = idx;
return node;
}
/*
* walk down backref nodes to find start of next reference path
*/
static struct backref_node *walk_down_backref(struct backref_edge *edges[],
int *index)
{
struct backref_edge *edge;
struct backref_node *lower;
int idx = *index;
while (idx > 0) {
edge = edges[idx - 1];
lower = edge->node[LOWER];
if (list_is_last(&edge->list[LOWER], &lower->upper)) {
idx--;
continue;
}
edge = list_entry(edge->list[LOWER].next,
struct backref_edge, list[LOWER]);
edges[idx - 1] = edge;
*index = idx;
return edge->node[UPPER];
}
*index = 0;
return NULL;
}
static void unlock_node_buffer(struct backref_node *node)
{
if (node->locked) {
btrfs_tree_unlock(node->eb);
node->locked = 0;
}
}
static void drop_node_buffer(struct backref_node *node)
{
if (node->eb) {
unlock_node_buffer(node);
free_extent_buffer(node->eb);
node->eb = NULL;
}
}
static void drop_backref_node(struct backref_cache *tree,
struct backref_node *node)
{
BUG_ON(!list_empty(&node->upper));
drop_node_buffer(node);
list_del(&node->list);
list_del(&node->lower);
if (!RB_EMPTY_NODE(&node->rb_node))
rb_erase(&node->rb_node, &tree->rb_root);
free_backref_node(tree, node);
}
/*
* remove a backref node from the backref cache
*/
static void remove_backref_node(struct backref_cache *cache,
struct backref_node *node)
{
struct backref_node *upper;
struct backref_edge *edge;
if (!node)
return;
BUG_ON(!node->lowest && !node->detached);
while (!list_empty(&node->upper)) {
edge = list_entry(node->upper.next, struct backref_edge,
list[LOWER]);
upper = edge->node[UPPER];
list_del(&edge->list[LOWER]);
list_del(&edge->list[UPPER]);
free_backref_edge(cache, edge);
if (RB_EMPTY_NODE(&upper->rb_node)) {
BUG_ON(!list_empty(&node->upper));
drop_backref_node(cache, node);
node = upper;
node->lowest = 1;
continue;
}
/*
* add the node to leaf node list if no other
* child block cached.
*/
if (list_empty(&upper->lower)) {
list_add_tail(&upper->lower, &cache->leaves);
upper->lowest = 1;
}
}
drop_backref_node(cache, node);
}
static void update_backref_node(struct backref_cache *cache,
struct backref_node *node, u64 bytenr)
{
struct rb_node *rb_node;
rb_erase(&node->rb_node, &cache->rb_root);
node->bytenr = bytenr;
rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, bytenr);
}
/*
* update backref cache after a transaction commit
*/
static int update_backref_cache(struct btrfs_trans_handle *trans,
struct backref_cache *cache)
{
struct backref_node *node;
int level = 0;
if (cache->last_trans == 0) {
cache->last_trans = trans->transid;
return 0;
}
if (cache->last_trans == trans->transid)
return 0;
/*
* detached nodes are used to avoid unnecessary backref
* lookup. transaction commit changes the extent tree.
* so the detached nodes are no longer useful.
*/
while (!list_empty(&cache->detached)) {
node = list_entry(cache->detached.next,
struct backref_node, list);
remove_backref_node(cache, node);
}
while (!list_empty(&cache->changed)) {
node = list_entry(cache->changed.next,
struct backref_node, list);
list_del_init(&node->list);
BUG_ON(node->pending);
update_backref_node(cache, node, node->new_bytenr);
}
/*
* some nodes can be left in the pending list if there were
* errors during processing the pending nodes.
*/
for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
list_for_each_entry(node, &cache->pending[level], list) {
BUG_ON(!node->pending);
if (node->bytenr == node->new_bytenr)
continue;
update_backref_node(cache, node, node->new_bytenr);
}
}
cache->last_trans = 0;
return 1;
}
static bool reloc_root_is_dead(struct btrfs_root *root)
{
/*
* Pair with set_bit/clear_bit in clean_dirty_subvols and
* btrfs_update_reloc_root. We need to see the updated bit before
* trying to access reloc_root
*/
smp_rmb();
if (test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state))
return true;
return false;
}
/*
* Check if this subvolume tree has valid reloc tree.
*
* Reloc tree after swap is considered dead, thus not considered as valid.
* This is enough for most callers, as they don't distinguish dead reloc root
* from no reloc root. But should_ignore_root() below is a special case.
*/
static bool have_reloc_root(struct btrfs_root *root)
{
if (reloc_root_is_dead(root))
return false;
if (!root->reloc_root)
return false;
return true;
}
static int should_ignore_root(struct btrfs_root *root)
{
struct btrfs_root *reloc_root;
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
return 0;
/* This root has been merged with its reloc tree, we can ignore it */
if (reloc_root_is_dead(root))
return 1;
reloc_root = root->reloc_root;
if (!reloc_root)
return 0;
if (btrfs_root_last_snapshot(&reloc_root->root_item) ==
root->fs_info->running_transaction->transid - 1)
return 0;
/*
* if there is reloc tree and it was created in previous
* transaction backref lookup can find the reloc tree,
* so backref node for the fs tree root is useless for
* relocation.
*/
return 1;
}
/*
* find reloc tree by address of tree root
*/
static struct btrfs_root *find_reloc_root(struct reloc_control *rc,
u64 bytenr)
{
struct rb_node *rb_node;
struct mapping_node *node;
struct btrfs_root *root = NULL;
spin_lock(&rc->reloc_root_tree.lock);
rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr);
if (rb_node) {
node = rb_entry(rb_node, struct mapping_node, rb_node);
root = (struct btrfs_root *)node->data;
}
spin_unlock(&rc->reloc_root_tree.lock);
return btrfs_grab_fs_root(root);
}
static int is_cowonly_root(u64 root_objectid)
{
if (root_objectid == BTRFS_ROOT_TREE_OBJECTID ||
root_objectid == BTRFS_EXTENT_TREE_OBJECTID ||
root_objectid == BTRFS_CHUNK_TREE_OBJECTID ||
root_objectid == BTRFS_DEV_TREE_OBJECTID ||
root_objectid == BTRFS_TREE_LOG_OBJECTID ||
root_objectid == BTRFS_CSUM_TREE_OBJECTID ||
root_objectid == BTRFS_UUID_TREE_OBJECTID ||
root_objectid == BTRFS_QUOTA_TREE_OBJECTID ||
root_objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
return 1;
return 0;
}
static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info,
u64 root_objectid)
{
struct btrfs_key key;
key.objectid = root_objectid;
key.type = BTRFS_ROOT_ITEM_KEY;
if (is_cowonly_root(root_objectid))
key.offset = 0;
else
key.offset = (u64)-1;
return btrfs_get_fs_root(fs_info, &key, false);
}
static noinline_for_stack
int find_inline_backref(struct extent_buffer *leaf, int slot,
unsigned long *ptr, unsigned long *end)
{
struct btrfs_key key;
struct btrfs_extent_item *ei;
struct btrfs_tree_block_info *bi;
u32 item_size;
btrfs_item_key_to_cpu(leaf, &key, slot);
item_size = btrfs_item_size_nr(leaf, slot);
if (item_size < sizeof(*ei)) {
btrfs_print_v0_err(leaf->fs_info);
btrfs_handle_fs_error(leaf->fs_info, -EINVAL, NULL);
return 1;
}
ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
WARN_ON(!(btrfs_extent_flags(leaf, ei) &
BTRFS_EXTENT_FLAG_TREE_BLOCK));
if (key.type == BTRFS_EXTENT_ITEM_KEY &&
item_size <= sizeof(*ei) + sizeof(*bi)) {
WARN_ON(item_size < sizeof(*ei) + sizeof(*bi));
return 1;
}
if (key.type == BTRFS_METADATA_ITEM_KEY &&
item_size <= sizeof(*ei)) {
WARN_ON(item_size < sizeof(*ei));
return 1;
}
if (key.type == BTRFS_EXTENT_ITEM_KEY) {
bi = (struct btrfs_tree_block_info *)(ei + 1);
*ptr = (unsigned long)(bi + 1);
} else {
*ptr = (unsigned long)(ei + 1);
}
*end = (unsigned long)ei + item_size;
return 0;
}
/*
* build backref tree for a given tree block. root of the backref tree
* corresponds the tree block, leaves of the backref tree correspond
* roots of b-trees that reference the tree block.
*
* the basic idea of this function is check backrefs of a given block
* to find upper level blocks that reference the block, and then check
* backrefs of these upper level blocks recursively. the recursion stop
* when tree root is reached or backrefs for the block is cached.
*
* NOTE: if we find backrefs for a block are cached, we know backrefs
* for all upper level blocks that directly/indirectly reference the
* block are also cached.
*/
static noinline_for_stack
struct backref_node *build_backref_tree(struct reloc_control *rc,
struct btrfs_key *node_key,
int level, u64 bytenr)
{
struct backref_cache *cache = &rc->backref_cache;
struct btrfs_path *path1; /* For searching extent root */
struct btrfs_path *path2; /* For searching parent of TREE_BLOCK_REF */
struct extent_buffer *eb;
struct btrfs_root *root;
struct backref_node *cur;
struct backref_node *upper;
struct backref_node *lower;
struct backref_node *node = NULL;
struct backref_node *exist = NULL;
struct backref_edge *edge;
struct rb_node *rb_node;
struct btrfs_key key;
unsigned long end;
unsigned long ptr;
LIST_HEAD(list); /* Pending edge list, upper node needs to be checked */
LIST_HEAD(useless);
int cowonly;
int ret;
int err = 0;
bool need_check = true;
path1 = btrfs_alloc_path();
path2 = btrfs_alloc_path();
if (!path1 || !path2) {
err = -ENOMEM;
goto out;
}
path1->reada = READA_FORWARD;
path2->reada = READA_FORWARD;
node = alloc_backref_node(cache);
if (!node) {
err = -ENOMEM;
goto out;
}
node->bytenr = bytenr;
node->level = level;
node->lowest = 1;
cur = node;
again:
end = 0;
ptr = 0;
key.objectid = cur->bytenr;
key.type = BTRFS_METADATA_ITEM_KEY;
key.offset = (u64)-1;
path1->search_commit_root = 1;
path1->skip_locking = 1;
ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1,
0, 0);
if (ret < 0) {
err = ret;
goto out;
}
ASSERT(ret);
ASSERT(path1->slots[0]);
path1->slots[0]--;
WARN_ON(cur->checked);
if (!list_empty(&cur->upper)) {
/*
* the backref was added previously when processing
* backref of type BTRFS_TREE_BLOCK_REF_KEY
*/
ASSERT(list_is_singular(&cur->upper));
edge = list_entry(cur->upper.next, struct backref_edge,
list[LOWER]);
ASSERT(list_empty(&edge->list[UPPER]));
exist = edge->node[UPPER];
/*
* add the upper level block to pending list if we need
* check its backrefs
*/
if (!exist->checked)
list_add_tail(&edge->list[UPPER], &list);
} else {
exist = NULL;
}
while (1) {
cond_resched();
eb = path1->nodes[0];
if (ptr >= end) {
if (path1->slots[0] >= btrfs_header_nritems(eb)) {
ret = btrfs_next_leaf(rc->extent_root, path1);
if (ret < 0) {
err = ret;
goto out;
}
if (ret > 0)
break;
eb = path1->nodes[0];
}
btrfs_item_key_to_cpu(eb, &key, path1->slots[0]);
if (key.objectid != cur->bytenr) {
WARN_ON(exist);
break;
}
if (key.type == BTRFS_EXTENT_ITEM_KEY ||
key.type == BTRFS_METADATA_ITEM_KEY) {
ret = find_inline_backref(eb, path1->slots[0],
&ptr, &end);
if (ret)
goto next;
}
}
if (ptr < end) {
/* update key for inline back ref */
struct btrfs_extent_inline_ref *iref;
int type;
iref = (struct btrfs_extent_inline_ref *)ptr;
type = btrfs_get_extent_inline_ref_type(eb, iref,
BTRFS_REF_TYPE_BLOCK);
if (type == BTRFS_REF_TYPE_INVALID) {
err = -EUCLEAN;
goto out;
}
key.type = type;
key.offset = btrfs_extent_inline_ref_offset(eb, iref);
WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY &&
key.type != BTRFS_SHARED_BLOCK_REF_KEY);
}
/*
* Parent node found and matches current inline ref, no need to
* rebuild this node for this inline ref.
*/
if (exist &&
((key.type == BTRFS_TREE_BLOCK_REF_KEY &&
exist->owner == key.offset) ||
(key.type == BTRFS_SHARED_BLOCK_REF_KEY &&
exist->bytenr == key.offset))) {
exist = NULL;
goto next;
}
/* SHARED_BLOCK_REF means key.offset is the parent bytenr */
if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) {
if (key.objectid == key.offset) {
/*
* Only root blocks of reloc trees use backref
* pointing to itself.
*/
root = find_reloc_root(rc, cur->bytenr);
ASSERT(root);
cur->root = root;
break;
}
edge = alloc_backref_edge(cache);
if (!edge) {
err = -ENOMEM;
goto out;
}
rb_node = tree_search(&cache->rb_root, key.offset);
if (!rb_node) {
upper = alloc_backref_node(cache);
if (!upper) {
free_backref_edge(cache, edge);
err = -ENOMEM;
goto out;
}
upper->bytenr = key.offset;
upper->level = cur->level + 1;
/*
* backrefs for the upper level block isn't
* cached, add the block to pending list
*/
list_add_tail(&edge->list[UPPER], &list);
} else {
upper = rb_entry(rb_node, struct backref_node,
rb_node);
ASSERT(upper->checked);
INIT_LIST_HEAD(&edge->list[UPPER]);
}
list_add_tail(&edge->list[LOWER], &cur->upper);
edge->node[LOWER] = cur;
edge->node[UPPER] = upper;
goto next;
} else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) {
err = -EINVAL;
btrfs_print_v0_err(rc->extent_root->fs_info);
btrfs_handle_fs_error(rc->extent_root->fs_info, err,
NULL);
goto out;
} else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) {
goto next;
}
/*
* key.type == BTRFS_TREE_BLOCK_REF_KEY, inline ref offset
* means the root objectid. We need to search the tree to get
* its parent bytenr.
*/
root = read_fs_root(rc->extent_root->fs_info, key.offset);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
cur->cowonly = 1;
if (btrfs_root_level(&root->root_item) == cur->level) {
/* tree root */
ASSERT(btrfs_root_bytenr(&root->root_item) ==
cur->bytenr);
if (should_ignore_root(root)) {
btrfs_put_fs_root(root);
list_add(&cur->list, &useless);
} else {
cur->root = root;
}
break;
}
level = cur->level + 1;
/* Search the tree to find parent blocks referring the block. */
path2->search_commit_root = 1;
path2->skip_locking = 1;
path2->lowest_level = level;
ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0);
path2->lowest_level = 0;
if (ret < 0) {
btrfs_put_fs_root(root);
err = ret;
goto out;
}
if (ret > 0 && path2->slots[level] > 0)
path2->slots[level]--;
eb = path2->nodes[level];
if (btrfs_node_blockptr(eb, path2->slots[level]) !=
cur->bytenr) {
btrfs_err(root->fs_info,
"couldn't find block (%llu) (level %d) in tree (%llu) with key (%llu %u %llu)",
cur->bytenr, level - 1,
root->root_key.objectid,
node_key->objectid, node_key->type,
node_key->offset);
btrfs_put_fs_root(root);
err = -ENOENT;
goto out;
}
lower = cur;
need_check = true;
/* Add all nodes and edges in the path */
for (; level < BTRFS_MAX_LEVEL; level++) {
if (!path2->nodes[level]) {
ASSERT(btrfs_root_bytenr(&root->root_item) ==
lower->bytenr);
if (should_ignore_root(root)) {
btrfs_put_fs_root(root);
list_add(&lower->list, &useless);
} else {
lower->root = root;
}
break;
}
edge = alloc_backref_edge(cache);
if (!edge) {
btrfs_put_fs_root(root);
err = -ENOMEM;
goto out;
}
eb = path2->nodes[level];
rb_node = tree_search(&cache->rb_root, eb->start);
if (!rb_node) {
upper = alloc_backref_node(cache);
if (!upper) {
btrfs_put_fs_root(root);
free_backref_edge(cache, edge);
err = -ENOMEM;
goto out;
}
upper->bytenr = eb->start;
upper->owner = btrfs_header_owner(eb);
upper->level = lower->level + 1;
if (!test_bit(BTRFS_ROOT_REF_COWS,
&root->state))
upper->cowonly = 1;
/*
* if we know the block isn't shared
* we can void checking its backrefs.
*/
if (btrfs_block_can_be_shared(root, eb))
upper->checked = 0;
else
upper->checked = 1;
/*
* add the block to pending list if we
* need check its backrefs, we only do this once
* while walking up a tree as we will catch
* anything else later on.
*/
if (!upper->checked && need_check) {
need_check = false;
list_add_tail(&edge->list[UPPER],
&list);
} else {
if (upper->checked)
need_check = true;
INIT_LIST_HEAD(&edge->list[UPPER]);
}
} else {
upper = rb_entry(rb_node, struct backref_node,
rb_node);
ASSERT(upper->checked);
INIT_LIST_HEAD(&edge->list[UPPER]);
if (!upper->owner)
upper->owner = btrfs_header_owner(eb);
}
list_add_tail(&edge->list[LOWER], &lower->upper);
edge->node[LOWER] = lower;
edge->node[UPPER] = upper;
if (rb_node) {
btrfs_put_fs_root(root);
break;
}
lower = upper;
upper = NULL;
}
btrfs_release_path(path2);
next:
if (ptr < end) {
ptr += btrfs_extent_inline_ref_size(key.type);
if (ptr >= end) {
WARN_ON(ptr > end);
ptr = 0;
end = 0;
}
}
if (ptr >= end)
path1->slots[0]++;
}
btrfs_release_path(path1);
cur->checked = 1;
WARN_ON(exist);
/* the pending list isn't empty, take the first block to process */
if (!list_empty(&list)) {
edge = list_entry(list.next, struct backref_edge, list[UPPER]);
list_del_init(&edge->list[UPPER]);
cur = edge->node[UPPER];
goto again;
}
/*
* everything goes well, connect backref nodes and insert backref nodes
* into the cache.
*/
ASSERT(node->checked);
cowonly = node->cowonly;
if (!cowonly) {
rb_node = tree_insert(&cache->rb_root, node->bytenr,
&node->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, node->bytenr);
list_add_tail(&node->lower, &cache->leaves);
}
list_for_each_entry(edge, &node->upper, list[LOWER])
list_add_tail(&edge->list[UPPER], &list);
while (!list_empty(&list)) {
edge = list_entry(list.next, struct backref_edge, list[UPPER]);
list_del_init(&edge->list[UPPER]);
upper = edge->node[UPPER];
if (upper->detached) {
list_del(&edge->list[LOWER]);
lower = edge->node[LOWER];
free_backref_edge(cache, edge);
if (list_empty(&lower->upper))
list_add(&lower->list, &useless);
continue;
}
if (!RB_EMPTY_NODE(&upper->rb_node)) {
if (upper->lowest) {
list_del_init(&upper->lower);
upper->lowest = 0;
}
list_add_tail(&edge->list[UPPER], &upper->lower);
continue;
}
if (!upper->checked) {
/*
* Still want to blow up for developers since this is a
* logic bug.
*/
ASSERT(0);
err = -EINVAL;
goto out;
}
if (cowonly != upper->cowonly) {
ASSERT(0);
err = -EINVAL;
goto out;
}
if (!cowonly) {
rb_node = tree_insert(&cache->rb_root, upper->bytenr,
&upper->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST,
upper->bytenr);
}
list_add_tail(&edge->list[UPPER], &upper->lower);
list_for_each_entry(edge, &upper->upper, list[LOWER])
list_add_tail(&edge->list[UPPER], &list);
}
/*
* process useless backref nodes. backref nodes for tree leaves
* are deleted from the cache. backref nodes for upper level
* tree blocks are left in the cache to avoid unnecessary backref
* lookup.
*/
while (!list_empty(&useless)) {
upper = list_entry(useless.next, struct backref_node, list);
list_del_init(&upper->list);
ASSERT(list_empty(&upper->upper));
if (upper == node)
node = NULL;
if (upper->lowest) {
list_del_init(&upper->lower);
upper->lowest = 0;
}
while (!list_empty(&upper->lower)) {
edge = list_entry(upper->lower.next,
struct backref_edge, list[UPPER]);
list_del(&edge->list[UPPER]);
list_del(&edge->list[LOWER]);
lower = edge->node[LOWER];
free_backref_edge(cache, edge);
if (list_empty(&lower->upper))
list_add(&lower->list, &useless);
}
__mark_block_processed(rc, upper);
if (upper->level > 0) {
list_add(&upper->list, &cache->detached);
upper->detached = 1;
} else {
rb_erase(&upper->rb_node, &cache->rb_root);
free_backref_node(cache, upper);
}
}
out:
btrfs_free_path(path1);
btrfs_free_path(path2);
if (err) {
while (!list_empty(&useless)) {
lower = list_entry(useless.next,
struct backref_node, list);
list_del_init(&lower->list);
}
while (!list_empty(&list)) {
edge = list_first_entry(&list, struct backref_edge,
list[UPPER]);
list_del(&edge->list[UPPER]);
list_del(&edge->list[LOWER]);
lower = edge->node[LOWER];
upper = edge->node[UPPER];
free_backref_edge(cache, edge);
/*
* Lower is no longer linked to any upper backref nodes
* and isn't in the cache, we can free it ourselves.
*/
if (list_empty(&lower->upper) &&
RB_EMPTY_NODE(&lower->rb_node))
list_add(&lower->list, &useless);
if (!RB_EMPTY_NODE(&upper->rb_node))
continue;
/* Add this guy's upper edges to the list to process */
list_for_each_entry(edge, &upper->upper, list[LOWER])
list_add_tail(&edge->list[UPPER], &list);
if (list_empty(&upper->upper))
list_add(&upper->list, &useless);
}
while (!list_empty(&useless)) {
lower = list_entry(useless.next,
struct backref_node, list);
list_del_init(&lower->list);
if (lower == node)
node = NULL;
free_backref_node(cache, lower);
}
free_backref_node(cache, node);
return ERR_PTR(err);
}
ASSERT(!node || !node->detached);
return node;
}
/*
* helper to add backref node for the newly created snapshot.
* the backref node is created by cloning backref node that
* corresponds to root of source tree
*/
static int clone_backref_node(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct btrfs_root *src,
struct btrfs_root *dest)
{
struct btrfs_root *reloc_root = src->reloc_root;
struct backref_cache *cache = &rc->backref_cache;
struct backref_node *node = NULL;
struct backref_node *new_node;
struct backref_edge *edge;
struct backref_edge *new_edge;
struct rb_node *rb_node;
if (cache->last_trans > 0)
update_backref_cache(trans, cache);
rb_node = tree_search(&cache->rb_root, src->commit_root->start);
if (rb_node) {
node = rb_entry(rb_node, struct backref_node, rb_node);
if (node->detached)
node = NULL;
else
BUG_ON(node->new_bytenr != reloc_root->node->start);
}
if (!node) {
rb_node = tree_search(&cache->rb_root,
reloc_root->commit_root->start);
if (rb_node) {
node = rb_entry(rb_node, struct backref_node,
rb_node);
BUG_ON(node->detached);
}
}
if (!node)
return 0;
new_node = alloc_backref_node(cache);
if (!new_node)
return -ENOMEM;
new_node->bytenr = dest->node->start;
new_node->level = node->level;
new_node->lowest = node->lowest;
new_node->checked = 1;
new_node->root = btrfs_grab_fs_root(dest);
ASSERT(new_node->root);
if (!node->lowest) {
list_for_each_entry(edge, &node->lower, list[UPPER]) {
new_edge = alloc_backref_edge(cache);
if (!new_edge)
goto fail;
new_edge->node[UPPER] = new_node;
new_edge->node[LOWER] = edge->node[LOWER];
list_add_tail(&new_edge->list[UPPER],
&new_node->lower);
}
} else {
list_add_tail(&new_node->lower, &cache->leaves);
}
rb_node = tree_insert(&cache->rb_root, new_node->bytenr,
&new_node->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, new_node->bytenr);
if (!new_node->lowest) {
list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) {
list_add_tail(&new_edge->list[LOWER],
&new_edge->node[LOWER]->upper);
}
}
return 0;
fail:
while (!list_empty(&new_node->lower)) {
new_edge = list_entry(new_node->lower.next,
struct backref_edge, list[UPPER]);
list_del(&new_edge->list[UPPER]);
free_backref_edge(cache, new_edge);
}
free_backref_node(cache, new_node);
return -ENOMEM;
}
/*
* helper to add 'address of tree root -> reloc tree' mapping
*/
static int __must_check __add_reloc_root(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct rb_node *rb_node;
struct mapping_node *node;
struct reloc_control *rc = fs_info->reloc_ctl;
node = kmalloc(sizeof(*node), GFP_NOFS);
if (!node)
return -ENOMEM;
node->bytenr = root->node->start;
node->data = root;
spin_lock(&rc->reloc_root_tree.lock);
rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
node->bytenr, &node->rb_node);
spin_unlock(&rc->reloc_root_tree.lock);
if (rb_node) {
btrfs_panic(fs_info, -EEXIST,
"Duplicate root found for start=%llu while inserting into relocation tree",
node->bytenr);
}
list_add_tail(&root->root_list, &rc->reloc_roots);
return 0;
}
/*
* helper to delete the 'address of tree root -> reloc tree'
* mapping
*/
static void __del_reloc_root(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct rb_node *rb_node;
struct mapping_node *node = NULL;
struct reloc_control *rc = fs_info->reloc_ctl;
if (rc && root->node) {
spin_lock(&rc->reloc_root_tree.lock);
rb_node = tree_search(&rc->reloc_root_tree.rb_root,
root->node->start);
if (rb_node) {
node = rb_entry(rb_node, struct mapping_node, rb_node);
rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
}
spin_unlock(&rc->reloc_root_tree.lock);
if (!node)
return;
BUG_ON((struct btrfs_root *)node->data != root);
}
spin_lock(&fs_info->trans_lock);
list_del_init(&root->root_list);
spin_unlock(&fs_info->trans_lock);
kfree(node);
}
/*
* helper to update the 'address of tree root -> reloc tree'
* mapping
*/
static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct rb_node *rb_node;
struct mapping_node *node = NULL;
struct reloc_control *rc = fs_info->reloc_ctl;
spin_lock(&rc->reloc_root_tree.lock);
rb_node = tree_search(&rc->reloc_root_tree.rb_root,
root->node->start);
if (rb_node) {
node = rb_entry(rb_node, struct mapping_node, rb_node);
rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
}
spin_unlock(&rc->reloc_root_tree.lock);
if (!node)
return 0;
BUG_ON((struct btrfs_root *)node->data != root);
spin_lock(&rc->reloc_root_tree.lock);
node->bytenr = new_bytenr;
rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
node->bytenr, &node->rb_node);
spin_unlock(&rc->reloc_root_tree.lock);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, node->bytenr);
return 0;
}
static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *reloc_root;
struct extent_buffer *eb;
struct btrfs_root_item *root_item;
struct btrfs_key root_key;
int ret;
root_item = kmalloc(sizeof(*root_item), GFP_NOFS);
BUG_ON(!root_item);
root_key.objectid = BTRFS_TREE_RELOC_OBJECTID;
root_key.type = BTRFS_ROOT_ITEM_KEY;
root_key.offset = objectid;
if (root->root_key.objectid == objectid) {
u64 commit_root_gen;
/* called by btrfs_init_reloc_root */
ret = btrfs_copy_root(trans, root, root->commit_root, &eb,
BTRFS_TREE_RELOC_OBJECTID);
BUG_ON(ret);
/*
* Set the last_snapshot field to the generation of the commit
* root - like this ctree.c:btrfs_block_can_be_shared() behaves
* correctly (returns true) when the relocation root is created
* either inside the critical section of a transaction commit
* (through transaction.c:qgroup_account_snapshot()) and when
* it's created before the transaction commit is started.
*/
commit_root_gen = btrfs_header_generation(root->commit_root);
btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen);
} else {
/*
* called by btrfs_reloc_post_snapshot_hook.
* the source tree is a reloc tree, all tree blocks
* modified after it was created have RELOC flag
* set in their headers. so it's OK to not update
* the 'last_snapshot'.
*/
ret = btrfs_copy_root(trans, root, root->node, &eb,
BTRFS_TREE_RELOC_OBJECTID);
BUG_ON(ret);
}
memcpy(root_item, &root->root_item, sizeof(*root_item));
btrfs_set_root_bytenr(root_item, eb->start);
btrfs_set_root_level(root_item, btrfs_header_level(eb));
btrfs_set_root_generation(root_item, trans->transid);
if (root->root_key.objectid == objectid) {
btrfs_set_root_refs(root_item, 0);
memset(&root_item->drop_progress, 0,
sizeof(struct btrfs_disk_key));
root_item->drop_level = 0;
}
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
ret = btrfs_insert_root(trans, fs_info->tree_root,
&root_key, root_item);
BUG_ON(ret);
kfree(root_item);
reloc_root = btrfs_read_tree_root(fs_info->tree_root, &root_key);
BUG_ON(IS_ERR(reloc_root));
set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state);
reloc_root->last_trans = trans->transid;
return reloc_root;
}
/*
* create reloc tree for a given fs tree. reloc tree is just a
* snapshot of the fs tree with special root objectid.
*/
int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *reloc_root;
struct reloc_control *rc = fs_info->reloc_ctl;
struct btrfs_block_rsv *rsv;
int clear_rsv = 0;
int ret;
/*
* The subvolume has reloc tree but the swap is finished, no need to
* create/update the dead reloc tree
*/
if (reloc_root_is_dead(root))
return 0;
if (root->reloc_root) {
reloc_root = root->reloc_root;
reloc_root->last_trans = trans->transid;
return 0;
}
if (!rc || !rc->create_reloc_tree ||
root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
return 0;
if (!trans->reloc_reserved) {
rsv = trans->block_rsv;
trans->block_rsv = rc->block_rsv;
clear_rsv = 1;
}
reloc_root = create_reloc_root(trans, root, root->root_key.objectid);
if (clear_rsv)
trans->block_rsv = rsv;
ret = __add_reloc_root(reloc_root);
BUG_ON(ret < 0);
root->reloc_root = reloc_root;
return 0;
}
/*
* update root item of reloc tree
*/
int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *reloc_root;
struct btrfs_root_item *root_item;
int ret;
if (!have_reloc_root(root))
goto out;
reloc_root = root->reloc_root;
root_item = &reloc_root->root_item;
/* root->reloc_root will stay until current relocation finished */
if (fs_info->reloc_ctl->merge_reloc_tree &&
btrfs_root_refs(root_item) == 0) {
set_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);
/*
* Mark the tree as dead before we change reloc_root so
* have_reloc_root will not touch it from now on.
*/
smp_wmb();
__del_reloc_root(reloc_root);
}
if (reloc_root->commit_root != reloc_root->node) {
btrfs_set_root_node(root_item, reloc_root->node);
free_extent_buffer(reloc_root->commit_root);
reloc_root->commit_root = btrfs_root_node(reloc_root);
}
ret = btrfs_update_root(trans, fs_info->tree_root,
&reloc_root->root_key, root_item);
BUG_ON(ret);
out:
return 0;
}
/*
* helper to find first cached inode with inode number >= objectid
* in a subvolume
*/
static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid)
{
struct rb_node *node;
struct rb_node *prev;
struct btrfs_inode *entry;
struct inode *inode;
spin_lock(&root->inode_lock);
again:
node = root->inode_tree.rb_node;
prev = NULL;
while (node) {
prev = node;
entry = rb_entry(node, struct btrfs_inode, rb_node);
if (objectid < btrfs_ino(entry))
node = node->rb_left;
else if (objectid > btrfs_ino(entry))
node = node->rb_right;
else
break;
}
if (!node) {
while (prev) {
entry = rb_entry(prev, struct btrfs_inode, rb_node);
if (objectid <= btrfs_ino(entry)) {
node = prev;
break;
}
prev = rb_next(prev);
}
}
while (node) {
entry = rb_entry(node, struct btrfs_inode, rb_node);
inode = igrab(&entry->vfs_inode);
if (inode) {
spin_unlock(&root->inode_lock);
return inode;
}
objectid = btrfs_ino(entry) + 1;
if (cond_resched_lock(&root->inode_lock))
goto again;
node = rb_next(node);
}
spin_unlock(&root->inode_lock);
return NULL;
}
static int in_block_group(u64 bytenr, struct btrfs_block_group *block_group)
{
if (bytenr >= block_group->start &&
bytenr < block_group->start + block_group->length)
return 1;
return 0;
}
/*
* get new location of data
*/
static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr,
u64 bytenr, u64 num_bytes)
{
struct btrfs_root *root = BTRFS_I(reloc_inode)->root;
struct btrfs_path *path;
struct btrfs_file_extent_item *fi;
struct extent_buffer *leaf;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
bytenr -= BTRFS_I(reloc_inode)->index_cnt;
ret = btrfs_lookup_file_extent(NULL, root, path,
btrfs_ino(BTRFS_I(reloc_inode)), bytenr, 0);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
leaf = path->nodes[0];
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
BUG_ON(btrfs_file_extent_offset(leaf, fi) ||
btrfs_file_extent_compression(leaf, fi) ||
btrfs_file_extent_encryption(leaf, fi) ||
btrfs_file_extent_other_encoding(leaf, fi));
if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
ret = -EINVAL;
goto out;
}
*new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
/*
* update file extent items in the tree leaf to point to
* the new locations.
*/
static noinline_for_stack
int replace_file_extents(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct btrfs_root *root,
struct extent_buffer *leaf)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
struct inode *inode = NULL;
u64 parent;
u64 bytenr;
u64 new_bytenr = 0;
u64 num_bytes;
u64 end;
u32 nritems;
u32 i;
int ret = 0;
int first = 1;
int dirty = 0;
if (rc->stage != UPDATE_DATA_PTRS)
return 0;
/* reloc trees always use full backref */
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
parent = leaf->start;
else
parent = 0;
nritems = btrfs_header_nritems(leaf);
for (i = 0; i < nritems; i++) {
struct btrfs_ref ref = { 0 };
cond_resched();
btrfs_item_key_to_cpu(leaf, &key, i);
if (key.type != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
if (btrfs_file_extent_type(leaf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
if (bytenr == 0)
continue;
if (!in_block_group(bytenr, rc->block_group))
continue;
/*
* if we are modifying block in fs tree, wait for readpage
* to complete and drop the extent cache
*/
if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
if (first) {
inode = find_next_inode(root, key.objectid);
first = 0;
} else if (inode && btrfs_ino(BTRFS_I(inode)) < key.objectid) {
btrfs_add_delayed_iput(inode);
inode = find_next_inode(root, key.objectid);
}
if (inode && btrfs_ino(BTRFS_I(inode)) == key.objectid) {
end = key.offset +
btrfs_file_extent_num_bytes(leaf, fi);
WARN_ON(!IS_ALIGNED(key.offset,
fs_info->sectorsize));
WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize));
end--;
ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
key.offset, end);
if (!ret)
continue;
btrfs_drop_extent_cache(BTRFS_I(inode),
key.offset, end, 1);
unlock_extent(&BTRFS_I(inode)->io_tree,
key.offset, end);
}
}
ret = get_new_location(rc->data_inode, &new_bytenr,
bytenr, num_bytes);
if (ret) {
/*
* Don't have to abort since we've not changed anything
* in the file extent yet.
*/
break;
}
btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr);
dirty = 1;
key.offset -= btrfs_file_extent_offset(leaf, fi);
btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
num_bytes, parent);
ref.real_root = root->root_key.objectid;
btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
key.objectid, key.offset);
ret = btrfs_inc_extent_ref(trans, &ref);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, bytenr,
num_bytes, parent);
ref.real_root = root->root_key.objectid;
btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
key.objectid, key.offset);
ret = btrfs_free_extent(trans, &ref);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
}
if (dirty)
btrfs_mark_buffer_dirty(leaf);
if (inode)
btrfs_add_delayed_iput(inode);
return ret;
}
static noinline_for_stack
int memcmp_node_keys(struct extent_buffer *eb, int slot,
struct btrfs_path *path, int level)
{
struct btrfs_disk_key key1;
struct btrfs_disk_key key2;
btrfs_node_key(eb, &key1, slot);
btrfs_node_key(path->nodes[level], &key2, path->slots[level]);
return memcmp(&key1, &key2, sizeof(key1));
}
/*
* try to replace tree blocks in fs tree with the new blocks
* in reloc tree. tree blocks haven't been modified since the
* reloc tree was create can be replaced.
*
* if a block was replaced, level of the block + 1 is returned.
* if no block got replaced, 0 is returned. if there are other
* errors, a negative error number is returned.
*/
static noinline_for_stack
int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
struct btrfs_root *dest, struct btrfs_root *src,
struct btrfs_path *path, struct btrfs_key *next_key,
int lowest_level, int max_level)
{
struct btrfs_fs_info *fs_info = dest->fs_info;
struct extent_buffer *eb;
struct extent_buffer *parent;
struct btrfs_ref ref = { 0 };
struct btrfs_key key;
u64 old_bytenr;
u64 new_bytenr;
u64 old_ptr_gen;
u64 new_ptr_gen;
u64 last_snapshot;
u32 blocksize;
int cow = 0;
int level;
int ret;
int slot;
BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);
BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID);
last_snapshot = btrfs_root_last_snapshot(&src->root_item);
again:
slot = path->slots[lowest_level];
btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot);
eb = btrfs_lock_root_node(dest);
btrfs_set_lock_blocking_write(eb);
level = btrfs_header_level(eb);
if (level < lowest_level) {
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
return 0;
}
if (cow) {
ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb);
BUG_ON(ret);
}
btrfs_set_lock_blocking_write(eb);
if (next_key) {
next_key->objectid = (u64)-1;
next_key->type = (u8)-1;
next_key->offset = (u64)-1;
}
parent = eb;
while (1) {
struct btrfs_key first_key;
level = btrfs_header_level(parent);
BUG_ON(level < lowest_level);
ret = btrfs_bin_search(parent, &key, level, &slot);
if (ret < 0)
break;
if (ret && slot > 0)
slot--;
if (next_key && slot + 1 < btrfs_header_nritems(parent))
btrfs_node_key_to_cpu(parent, next_key, slot + 1);
old_bytenr = btrfs_node_blockptr(parent, slot);
blocksize = fs_info->nodesize;
old_ptr_gen = btrfs_node_ptr_generation(parent, slot);
btrfs_node_key_to_cpu(parent, &first_key, slot);
if (level <= max_level) {
eb = path->nodes[level];
new_bytenr = btrfs_node_blockptr(eb,
path->slots[level]);
new_ptr_gen = btrfs_node_ptr_generation(eb,
path->slots[level]);
} else {
new_bytenr = 0;
new_ptr_gen = 0;
}
if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) {
ret = level;
break;
}
if (new_bytenr == 0 || old_ptr_gen > last_snapshot ||
memcmp_node_keys(parent, slot, path, level)) {
if (level <= lowest_level) {
ret = 0;
break;
}
eb = read_tree_block(fs_info, old_bytenr, old_ptr_gen,
level - 1, &first_key);
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
break;
} else if (!extent_buffer_uptodate(eb)) {
ret = -EIO;
free_extent_buffer(eb);
break;
}
btrfs_tree_lock(eb);
if (cow) {
ret = btrfs_cow_block(trans, dest, eb, parent,
slot, &eb);
BUG_ON(ret);
}
btrfs_set_lock_blocking_write(eb);
btrfs_tree_unlock(parent);
free_extent_buffer(parent);
parent = eb;
continue;
}
if (!cow) {
btrfs_tree_unlock(parent);
free_extent_buffer(parent);
cow = 1;
goto again;
}
btrfs_node_key_to_cpu(path->nodes[level], &key,
path->slots[level]);
btrfs_release_path(path);
path->lowest_level = level;
ret = btrfs_search_slot(trans, src, &key, path, 0, 1);
path->lowest_level = 0;
BUG_ON(ret);
/*
* Info qgroup to trace both subtrees.
*
* We must trace both trees.
* 1) Tree reloc subtree
* If not traced, we will leak data numbers
* 2) Fs subtree
* If not traced, we will double count old data
*
* We don't scan the subtree right now, but only record
* the swapped tree blocks.
* The real subtree rescan is delayed until we have new
* CoW on the subtree root node before transaction commit.
*/
ret = btrfs_qgroup_add_swapped_blocks(trans, dest,
rc->block_group, parent, slot,
path->nodes[level], path->slots[level],
last_snapshot);
if (ret < 0)
break;
/*
* swap blocks in fs tree and reloc tree.
*/
btrfs_set_node_blockptr(parent, slot, new_bytenr);
btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen);
btrfs_mark_buffer_dirty(parent);
btrfs_set_node_blockptr(path->nodes[level],
path->slots[level], old_bytenr);
btrfs_set_node_ptr_generation(path->nodes[level],
path->slots[level], old_ptr_gen);
btrfs_mark_buffer_dirty(path->nodes[level]);
btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr,
blocksize, path->nodes[level]->start);
ref.skip_qgroup = true;
btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid);
ret = btrfs_inc_extent_ref(trans, &ref);
BUG_ON(ret);
btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
blocksize, 0);
ref.skip_qgroup = true;
btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid);
ret = btrfs_inc_extent_ref(trans, &ref);
BUG_ON(ret);
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, new_bytenr,
blocksize, path->nodes[level]->start);
btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid);
ref.skip_qgroup = true;
ret = btrfs_free_extent(trans, &ref);
BUG_ON(ret);
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, old_bytenr,
blocksize, 0);
btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid);
ref.skip_qgroup = true;
ret = btrfs_free_extent(trans, &ref);
BUG_ON(ret);
btrfs_unlock_up_safe(path, 0);
ret = level;
break;
}
btrfs_tree_unlock(parent);
free_extent_buffer(parent);
return ret;
}
/*
* helper to find next relocated block in reloc tree
*/
static noinline_for_stack
int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path,
int *level)
{
struct extent_buffer *eb;
int i;
u64 last_snapshot;
u32 nritems;
last_snapshot = btrfs_root_last_snapshot(&root->root_item);
for (i = 0; i < *level; i++) {
free_extent_buffer(path->nodes[i]);
path->nodes[i] = NULL;
}
for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
eb = path->nodes[i];
nritems = btrfs_header_nritems(eb);
while (path->slots[i] + 1 < nritems) {
path->slots[i]++;
if (btrfs_node_ptr_generation(eb, path->slots[i]) <=
last_snapshot)
continue;
*level = i;
return 0;
}
free_extent_buffer(path->nodes[i]);
path->nodes[i] = NULL;
}
return 1;
}
/*
* walk down reloc tree to find relocated block of lowest level
*/
static noinline_for_stack
int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path,
int *level)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct extent_buffer *eb = NULL;
int i;
u64 bytenr;
u64 ptr_gen = 0;
u64 last_snapshot;
u32 nritems;
last_snapshot = btrfs_root_last_snapshot(&root->root_item);
for (i = *level; i > 0; i--) {
struct btrfs_key first_key;
eb = path->nodes[i];
nritems = btrfs_header_nritems(eb);
while (path->slots[i] < nritems) {
ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]);
if (ptr_gen > last_snapshot)
break;
path->slots[i]++;
}
if (path->slots[i] >= nritems) {
if (i == *level)
break;
*level = i + 1;
return 0;
}
if (i == 1) {
*level = i;
return 0;
}
bytenr = btrfs_node_blockptr(eb, path->slots[i]);
btrfs_node_key_to_cpu(eb, &first_key, path->slots[i]);
eb = read_tree_block(fs_info, bytenr, ptr_gen, i - 1,
&first_key);
if (IS_ERR(eb)) {
return PTR_ERR(eb);
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
return -EIO;
}
BUG_ON(btrfs_header_level(eb) != i - 1);
path->nodes[i - 1] = eb;
path->slots[i - 1] = 0;
}
return 1;
}
/*
* invalidate extent cache for file extents whose key in range of
* [min_key, max_key)
*/
static int invalidate_extent_cache(struct btrfs_root *root,
struct btrfs_key *min_key,
struct btrfs_key *max_key)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct inode *inode = NULL;
u64 objectid;
u64 start, end;
u64 ino;
objectid = min_key->objectid;
while (1) {
cond_resched();
iput(inode);
if (objectid > max_key->objectid)
break;
inode = find_next_inode(root, objectid);
if (!inode)
break;
ino = btrfs_ino(BTRFS_I(inode));
if (ino > max_key->objectid) {
iput(inode);
break;
}
objectid = ino + 1;
if (!S_ISREG(inode->i_mode))
continue;
if (unlikely(min_key->objectid == ino)) {
if (min_key->type > BTRFS_EXTENT_DATA_KEY)
continue;
if (min_key->type < BTRFS_EXTENT_DATA_KEY)
start = 0;
else {
start = min_key->offset;
WARN_ON(!IS_ALIGNED(start, fs_info->sectorsize));
}
} else {
start = 0;
}
if (unlikely(max_key->objectid == ino)) {
if (max_key->type < BTRFS_EXTENT_DATA_KEY)
continue;
if (max_key->type > BTRFS_EXTENT_DATA_KEY) {
end = (u64)-1;
} else {
if (max_key->offset == 0)
continue;
end = max_key->offset;
WARN_ON(!IS_ALIGNED(end, fs_info->sectorsize));
end--;
}
} else {
end = (u64)-1;
}
/* the lock_extent waits for readpage to complete */
lock_extent(&BTRFS_I(inode)->io_tree, start, end);
btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 1);
unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
}
return 0;
}
static int find_next_key(struct btrfs_path *path, int level,
struct btrfs_key *key)
{
while (level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
break;
if (path->slots[level] + 1 <
btrfs_header_nritems(path->nodes[level])) {
btrfs_node_key_to_cpu(path->nodes[level], key,
path->slots[level] + 1);
return 0;
}
level++;
}
return 1;
}
/*
* Insert current subvolume into reloc_control::dirty_subvol_roots
*/
static void insert_dirty_subvol(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct btrfs_root *root)
{
struct btrfs_root *reloc_root = root->reloc_root;
struct btrfs_root_item *reloc_root_item;
/* @root must be a subvolume tree root with a valid reloc tree */
ASSERT(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);
ASSERT(reloc_root);
reloc_root_item = &reloc_root->root_item;
memset(&reloc_root_item->drop_progress, 0,
sizeof(reloc_root_item->drop_progress));
reloc_root_item->drop_level = 0;
btrfs_set_root_refs(reloc_root_item, 0);
btrfs_update_reloc_root(trans, root);
if (list_empty(&root->reloc_dirty_list)) {
btrfs_grab_fs_root(root);
list_add_tail(&root->reloc_dirty_list, &rc->dirty_subvol_roots);
}
}
static int clean_dirty_subvols(struct reloc_control *rc)
{
struct btrfs_root *root;
struct btrfs_root *next;
int ret = 0;
int ret2;
list_for_each_entry_safe(root, next, &rc->dirty_subvol_roots,
reloc_dirty_list) {
if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
/* Merged subvolume, cleanup its reloc root */
struct btrfs_root *reloc_root = root->reloc_root;
list_del_init(&root->reloc_dirty_list);
root->reloc_root = NULL;
if (reloc_root) {
ret2 = btrfs_drop_snapshot(reloc_root, NULL, 0, 1);
if (ret2 < 0 && !ret)
ret = ret2;
}
/*
* Need barrier to ensure clear_bit() only happens after
* root->reloc_root = NULL. Pairs with have_reloc_root.
*/
smp_wmb();
clear_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state);
btrfs_put_fs_root(root);
} else {
/* Orphan reloc tree, just clean it up */
ret2 = btrfs_drop_snapshot(root, NULL, 0, 1);
if (ret2 < 0 && !ret)
ret = ret2;
}
}
return ret;
}
/*
* merge the relocated tree blocks in reloc tree with corresponding
* fs tree.
*/
static noinline_for_stack int merge_reloc_root(struct reloc_control *rc,
struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct btrfs_key key;
struct btrfs_key next_key;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_root *reloc_root;
struct btrfs_root_item *root_item;
struct btrfs_path *path;
struct extent_buffer *leaf;
int level;
int max_level;
int replaced = 0;
int ret;
int err = 0;
u32 min_reserved;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = READA_FORWARD;
reloc_root = root->reloc_root;
root_item = &reloc_root->root_item;
if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
level = btrfs_root_level(root_item);
atomic_inc(&reloc_root->node->refs);
path->nodes[level] = reloc_root->node;
path->slots[level] = 0;
} else {
btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
level = root_item->drop_level;
BUG_ON(level == 0);
path->lowest_level = level;
ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0);
path->lowest_level = 0;
if (ret < 0) {
btrfs_free_path(path);
return ret;
}
btrfs_node_key_to_cpu(path->nodes[level], &next_key,
path->slots[level]);
WARN_ON(memcmp(&key, &next_key, sizeof(key)));
btrfs_unlock_up_safe(path, 0);
}
min_reserved = fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2;
memset(&next_key, 0, sizeof(next_key));
while (1) {
ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved,
BTRFS_RESERVE_FLUSH_ALL);
if (ret) {
err = ret;
goto out;
}
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
trans = NULL;
goto out;
}
trans->block_rsv = rc->block_rsv;
replaced = 0;
max_level = level;
ret = walk_down_reloc_tree(reloc_root, path, &level);
if (ret < 0) {
err = ret;
goto out;
}
if (ret > 0)
break;
if (!find_next_key(path, level, &key) &&
btrfs_comp_cpu_keys(&next_key, &key) >= 0) {
ret = 0;
} else {
ret = replace_path(trans, rc, root, reloc_root, path,
&next_key, level, max_level);
}
if (ret < 0) {
err = ret;
goto out;
}
if (ret > 0) {
level = ret;
btrfs_node_key_to_cpu(path->nodes[level], &key,
path->slots[level]);
replaced = 1;
}
ret = walk_up_reloc_tree(reloc_root, path, &level);
if (ret > 0)
break;
BUG_ON(level == 0);
/*
* save the merging progress in the drop_progress.
* this is OK since root refs == 1 in this case.
*/
btrfs_node_key(path->nodes[level], &root_item->drop_progress,
path->slots[level]);
root_item->drop_level = level;
btrfs_end_transaction_throttle(trans);
trans = NULL;
btrfs_btree_balance_dirty(fs_info);
if (replaced && rc->stage == UPDATE_DATA_PTRS)
invalidate_extent_cache(root, &key, &next_key);
}
/*
* handle the case only one block in the fs tree need to be
* relocated and the block is tree root.
*/
leaf = btrfs_lock_root_node(root);
ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf);
btrfs_tree_unlock(leaf);
free_extent_buffer(leaf);
if (ret < 0)
err = ret;
out:
btrfs_free_path(path);
if (err == 0)
insert_dirty_subvol(trans, rc, root);
if (trans)
btrfs_end_transaction_throttle(trans);
btrfs_btree_balance_dirty(fs_info);
if (replaced && rc->stage == UPDATE_DATA_PTRS)
invalidate_extent_cache(root, &key, &next_key);
return err;
}
static noinline_for_stack
int prepare_to_merge(struct reloc_control *rc, int err)
{
struct btrfs_root *root = rc->extent_root;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *reloc_root;
struct btrfs_trans_handle *trans;
LIST_HEAD(reloc_roots);
u64 num_bytes = 0;
int ret;
mutex_lock(&fs_info->reloc_mutex);
rc->merging_rsv_size += fs_info->nodesize * (BTRFS_MAX_LEVEL - 1) * 2;
rc->merging_rsv_size += rc->nodes_relocated * 2;
mutex_unlock(&fs_info->reloc_mutex);
again:
if (!err) {
num_bytes = rc->merging_rsv_size;
ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes,
BTRFS_RESERVE_FLUSH_ALL);
if (ret)
err = ret;
}
trans = btrfs_join_transaction(rc->extent_root);
if (IS_ERR(trans)) {
if (!err)
btrfs_block_rsv_release(fs_info, rc->block_rsv,
num_bytes);
return PTR_ERR(trans);
}
if (!err) {
if (num_bytes != rc->merging_rsv_size) {
btrfs_end_transaction(trans);
btrfs_block_rsv_release(fs_info, rc->block_rsv,
num_bytes);
goto again;
}
}
rc->merge_reloc_tree = 1;
while (!list_empty(&rc->reloc_roots)) {
reloc_root = list_entry(rc->reloc_roots.next,
struct btrfs_root, root_list);
list_del_init(&reloc_root->root_list);
root = read_fs_root(fs_info, reloc_root->root_key.offset);
BUG_ON(IS_ERR(root));
BUG_ON(root->reloc_root != reloc_root);
/*
* set reference count to 1, so btrfs_recover_relocation
* knows it should resumes merging
*/
if (!err)
btrfs_set_root_refs(&reloc_root->root_item, 1);
btrfs_update_reloc_root(trans, root);
list_add(&reloc_root->root_list, &reloc_roots);
btrfs_put_fs_root(root);
}
list_splice(&reloc_roots, &rc->reloc_roots);
if (!err)
btrfs_commit_transaction(trans);
else
btrfs_end_transaction(trans);
return err;
}
static noinline_for_stack
void free_reloc_roots(struct list_head *list)
{
struct btrfs_root *reloc_root;
while (!list_empty(list)) {
reloc_root = list_entry(list->next, struct btrfs_root,
root_list);
__del_reloc_root(reloc_root);
free_extent_buffer(reloc_root->node);
free_extent_buffer(reloc_root->commit_root);
reloc_root->node = NULL;
reloc_root->commit_root = NULL;
}
}
static noinline_for_stack
void merge_reloc_roots(struct reloc_control *rc)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct btrfs_root *root;
struct btrfs_root *reloc_root;
LIST_HEAD(reloc_roots);
int found = 0;
int ret = 0;
again:
root = rc->extent_root;
/*
* this serializes us with btrfs_record_root_in_transaction,
* we have to make sure nobody is in the middle of
* adding their roots to the list while we are
* doing this splice
*/
mutex_lock(&fs_info->reloc_mutex);
list_splice_init(&rc->reloc_roots, &reloc_roots);
mutex_unlock(&fs_info->reloc_mutex);
while (!list_empty(&reloc_roots)) {
found = 1;
reloc_root = list_entry(reloc_roots.next,
struct btrfs_root, root_list);
if (btrfs_root_refs(&reloc_root->root_item) > 0) {
root = read_fs_root(fs_info,
reloc_root->root_key.offset);
BUG_ON(IS_ERR(root));
BUG_ON(root->reloc_root != reloc_root);
ret = merge_reloc_root(rc, root);
btrfs_put_fs_root(root);
if (ret) {
if (list_empty(&reloc_root->root_list))
list_add_tail(&reloc_root->root_list,
&reloc_roots);
goto out;
}
} else {
list_del_init(&reloc_root->root_list);
/* Don't forget to queue this reloc root for cleanup */
list_add_tail(&reloc_root->reloc_dirty_list,
&rc->dirty_subvol_roots);
}
}
if (found) {
found = 0;
goto again;
}
out:
if (ret) {
btrfs_handle_fs_error(fs_info, ret, NULL);
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
/* new reloc root may be added */
mutex_lock(&fs_info->reloc_mutex);
list_splice_init(&rc->reloc_roots, &reloc_roots);
mutex_unlock(&fs_info->reloc_mutex);
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
}
BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root));
}
static void free_block_list(struct rb_root *blocks)
{
struct tree_block *block;
struct rb_node *rb_node;
while ((rb_node = rb_first(blocks))) {
block = rb_entry(rb_node, struct tree_block, rb_node);
rb_erase(rb_node, blocks);
kfree(block);
}
}
static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *reloc_root)
{
struct btrfs_fs_info *fs_info = reloc_root->fs_info;
struct btrfs_root *root;
int ret;
if (reloc_root->last_trans == trans->transid)
return 0;
root = read_fs_root(fs_info, reloc_root->root_key.offset);
BUG_ON(IS_ERR(root));
BUG_ON(root->reloc_root != reloc_root);
ret = btrfs_record_root_in_trans(trans, root);
btrfs_put_fs_root(root);
return ret;
}
static noinline_for_stack
struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct backref_node *node,
struct backref_edge *edges[])
{
struct backref_node *next;
struct btrfs_root *root;
int index = 0;
next = node;
while (1) {
cond_resched();
next = walk_up_backref(next, edges, &index);
root = next->root;
BUG_ON(!root);
BUG_ON(!test_bit(BTRFS_ROOT_REF_COWS, &root->state));
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
record_reloc_root_in_trans(trans, root);
break;
}
btrfs_record_root_in_trans(trans, root);
root = root->reloc_root;
if (next->new_bytenr != root->node->start) {
BUG_ON(next->new_bytenr);
BUG_ON(!list_empty(&next->list));
next->new_bytenr = root->node->start;
btrfs_put_fs_root(next->root);
next->root = btrfs_grab_fs_root(root);
ASSERT(next->root);
list_add_tail(&next->list,
&rc->backref_cache.changed);
__mark_block_processed(rc, next);
break;
}
WARN_ON(1);
root = NULL;
next = walk_down_backref(edges, &index);
if (!next || next->level <= node->level)
break;
}
if (!root)
return NULL;
next = node;
/* setup backref node path for btrfs_reloc_cow_block */
while (1) {
rc->backref_cache.path[next->level] = next;
if (--index < 0)
break;
next = edges[index]->node[UPPER];
}
return root;
}
/*
* select a tree root for relocation. return NULL if the block
* is reference counted. we should use do_relocation() in this
* case. return a tree root pointer if the block isn't reference
* counted. return -ENOENT if the block is root of reloc tree.
*/
static noinline_for_stack
struct btrfs_root *select_one_root(struct backref_node *node)
{
struct backref_node *next;
struct btrfs_root *root;
struct btrfs_root *fs_root = NULL;
struct backref_edge *edges[BTRFS_MAX_LEVEL - 1];
int index = 0;
next = node;
while (1) {
cond_resched();
next = walk_up_backref(next, edges, &index);
root = next->root;
BUG_ON(!root);
/* no other choice for non-references counted tree */
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
return root;
if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID)
fs_root = root;
if (next != node)
return NULL;
next = walk_down_backref(edges, &index);
if (!next || next->level <= node->level)
break;
}
if (!fs_root)
return ERR_PTR(-ENOENT);
return fs_root;
}
static noinline_for_stack
u64 calcu_metadata_size(struct reloc_control *rc,
struct backref_node *node, int reserve)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct backref_node *next = node;
struct backref_edge *edge;
struct backref_edge *edges[BTRFS_MAX_LEVEL - 1];
u64 num_bytes = 0;
int index = 0;
BUG_ON(reserve && node->processed);
while (next) {
cond_resched();
while (1) {
if (next->processed && (reserve || next != node))
break;
num_bytes += fs_info->nodesize;
if (list_empty(&next->upper))
break;
edge = list_entry(next->upper.next,
struct backref_edge, list[LOWER]);
edges[index++] = edge;
next = edge->node[UPPER];
}
next = walk_down_backref(edges, &index);
}
return num_bytes;
}
static int reserve_metadata_space(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct backref_node *node)
{
struct btrfs_root *root = rc->extent_root;
struct btrfs_fs_info *fs_info = root->fs_info;
u64 num_bytes;
int ret;
u64 tmp;
num_bytes = calcu_metadata_size(rc, node, 1) * 2;
trans->block_rsv = rc->block_rsv;
rc->reserved_bytes += num_bytes;
/*
* We are under a transaction here so we can only do limited flushing.
* If we get an enospc just kick back -EAGAIN so we know to drop the
* transaction and try to refill when we can flush all the things.
*/
ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes,
BTRFS_RESERVE_FLUSH_LIMIT);
if (ret) {
tmp = fs_info->nodesize * RELOCATION_RESERVED_NODES;
while (tmp <= rc->reserved_bytes)
tmp <<= 1;
/*
* only one thread can access block_rsv at this point,
* so we don't need hold lock to protect block_rsv.
* we expand more reservation size here to allow enough
* space for relocation and we will return earlier in
* enospc case.
*/
rc->block_rsv->size = tmp + fs_info->nodesize *
RELOCATION_RESERVED_NODES;
return -EAGAIN;
}
return 0;
}
/*
* relocate a block tree, and then update pointers in upper level
* blocks that reference the block to point to the new location.
*
* if called by link_to_upper, the block has already been relocated.
* in that case this function just updates pointers.
*/
static int do_relocation(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct backref_node *node,
struct btrfs_key *key,
struct btrfs_path *path, int lowest)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct backref_node *upper;
struct backref_edge *edge;
struct backref_edge *edges[BTRFS_MAX_LEVEL - 1];
struct btrfs_root *root;
struct extent_buffer *eb;
u32 blocksize;
u64 bytenr;
u64 generation;
int slot;
int ret;
int err = 0;
BUG_ON(lowest && node->eb);
path->lowest_level = node->level + 1;
rc->backref_cache.path[node->level] = node;
list_for_each_entry(edge, &node->upper, list[LOWER]) {
struct btrfs_key first_key;
struct btrfs_ref ref = { 0 };
cond_resched();
upper = edge->node[UPPER];
root = select_reloc_root(trans, rc, upper, edges);
BUG_ON(!root);
if (upper->eb && !upper->locked) {
if (!lowest) {
ret = btrfs_bin_search(upper->eb, key,
upper->level, &slot);
if (ret < 0) {
err = ret;
goto next;
}
BUG_ON(ret);
bytenr = btrfs_node_blockptr(upper->eb, slot);
if (node->eb->start == bytenr)
goto next;
}
drop_node_buffer(upper);
}
if (!upper->eb) {
ret = btrfs_search_slot(trans, root, key, path, 0, 1);
if (ret) {
if (ret < 0)
err = ret;
else
err = -ENOENT;
btrfs_release_path(path);
break;
}
if (!upper->eb) {
upper->eb = path->nodes[upper->level];
path->nodes[upper->level] = NULL;
} else {
BUG_ON(upper->eb != path->nodes[upper->level]);
}
upper->locked = 1;
path->locks[upper->level] = 0;
slot = path->slots[upper->level];
btrfs_release_path(path);
} else {
ret = btrfs_bin_search(upper->eb, key, upper->level,
&slot);
if (ret < 0) {
err = ret;
goto next;
}
BUG_ON(ret);
}
bytenr = btrfs_node_blockptr(upper->eb, slot);
if (lowest) {
if (bytenr != node->bytenr) {
btrfs_err(root->fs_info,
"lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu",
bytenr, node->bytenr, slot,
upper->eb->start);
err = -EIO;
goto next;
}
} else {
if (node->eb->start == bytenr)
goto next;
}
blocksize = root->fs_info->nodesize;
generation = btrfs_node_ptr_generation(upper->eb, slot);
btrfs_node_key_to_cpu(upper->eb, &first_key, slot);
eb = read_tree_block(fs_info, bytenr, generation,
upper->level - 1, &first_key);
if (IS_ERR(eb)) {
err = PTR_ERR(eb);
goto next;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
err = -EIO;
goto next;
}
btrfs_tree_lock(eb);
btrfs_set_lock_blocking_write(eb);
if (!node->eb) {
ret = btrfs_cow_block(trans, root, eb, upper->eb,
slot, &eb);
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
if (ret < 0) {
err = ret;
goto next;
}
BUG_ON(node->eb != eb);
} else {
btrfs_set_node_blockptr(upper->eb, slot,
node->eb->start);
btrfs_set_node_ptr_generation(upper->eb, slot,
trans->transid);
btrfs_mark_buffer_dirty(upper->eb);
btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF,
node->eb->start, blocksize,
upper->eb->start);
ref.real_root = root->root_key.objectid;
btrfs_init_tree_ref(&ref, node->level,
btrfs_header_owner(upper->eb));
ret = btrfs_inc_extent_ref(trans, &ref);
BUG_ON(ret);
ret = btrfs_drop_subtree(trans, root, eb, upper->eb);
BUG_ON(ret);
}
next:
if (!upper->pending)
drop_node_buffer(upper);
else
unlock_node_buffer(upper);
if (err)
break;
}
if (!err && node->pending) {
drop_node_buffer(node);
list_move_tail(&node->list, &rc->backref_cache.changed);
node->pending = 0;
}
path->lowest_level = 0;
BUG_ON(err == -ENOSPC);
return err;
}
static int link_to_upper(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct backref_node *node,
struct btrfs_path *path)
{
struct btrfs_key key;
btrfs_node_key_to_cpu(node->eb, &key, 0);
return do_relocation(trans, rc, node, &key, path, 0);
}
static int finish_pending_nodes(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct btrfs_path *path, int err)
{
LIST_HEAD(list);
struct backref_cache *cache = &rc->backref_cache;
struct backref_node *node;
int level;
int ret;
for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
while (!list_empty(&cache->pending[level])) {
node = list_entry(cache->pending[level].next,
struct backref_node, list);
list_move_tail(&node->list, &list);
BUG_ON(!node->pending);
if (!err) {
ret = link_to_upper(trans, rc, node, path);
if (ret < 0)
err = ret;
}
}
list_splice_init(&list, &cache->pending[level]);
}
return err;
}
static void mark_block_processed(struct reloc_control *rc,
u64 bytenr, u32 blocksize)
{
set_extent_bits(&rc->processed_blocks, bytenr, bytenr + blocksize - 1,
EXTENT_DIRTY);
}
static void __mark_block_processed(struct reloc_control *rc,
struct backref_node *node)
{
u32 blocksize;
if (node->level == 0 ||
in_block_group(node->bytenr, rc->block_group)) {
blocksize = rc->extent_root->fs_info->nodesize;
mark_block_processed(rc, node->bytenr, blocksize);
}
node->processed = 1;
}
/*
* mark a block and all blocks directly/indirectly reference the block
* as processed.
*/
static void update_processed_blocks(struct reloc_control *rc,
struct backref_node *node)
{
struct backref_node *next = node;
struct backref_edge *edge;
struct backref_edge *edges[BTRFS_MAX_LEVEL - 1];
int index = 0;
while (next) {
cond_resched();
while (1) {
if (next->processed)
break;
__mark_block_processed(rc, next);
if (list_empty(&next->upper))
break;
edge = list_entry(next->upper.next,
struct backref_edge, list[LOWER]);
edges[index++] = edge;
next = edge->node[UPPER];
}
next = walk_down_backref(edges, &index);
}
}
static int tree_block_processed(u64 bytenr, struct reloc_control *rc)
{
u32 blocksize = rc->extent_root->fs_info->nodesize;
if (test_range_bit(&rc->processed_blocks, bytenr,
bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL))
return 1;
return 0;
}
static int get_tree_block_key(struct btrfs_fs_info *fs_info,
struct tree_block *block)
{
struct extent_buffer *eb;
BUG_ON(block->key_ready);
eb = read_tree_block(fs_info, block->bytenr, block->key.offset,
block->level, NULL);
if (IS_ERR(eb)) {
return PTR_ERR(eb);
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
return -EIO;
}
if (block->level == 0)
btrfs_item_key_to_cpu(eb, &block->key, 0);
else
btrfs_node_key_to_cpu(eb, &block->key, 0);
free_extent_buffer(eb);
block->key_ready = 1;
return 0;
}
/*
* helper function to relocate a tree block
*/
static int relocate_tree_block(struct btrfs_trans_handle *trans,
struct reloc_control *rc,
struct backref_node *node,
struct btrfs_key *key,
struct btrfs_path *path)
{
struct btrfs_root *root;
int ret = 0;
if (!node)
return 0;
BUG_ON(node->processed);
root = select_one_root(node);
if (root == ERR_PTR(-ENOENT)) {
update_processed_blocks(rc, node);
goto out;
}
if (!root || test_bit(BTRFS_ROOT_REF_COWS, &root->state)) {
ret = reserve_metadata_space(trans, rc, node);
if (ret)
goto out;
}
if (root) {
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) {
BUG_ON(node->new_bytenr);
BUG_ON(!list_empty(&node->list));
btrfs_record_root_in_trans(trans, root);
root = root->reloc_root;
node->new_bytenr = root->node->start;
btrfs_put_fs_root(node->root);
node->root = btrfs_grab_fs_root(root);
ASSERT(node->root);
list_add_tail(&node->list, &rc->backref_cache.changed);
} else {
path->lowest_level = node->level;
ret = btrfs_search_slot(trans, root, key, path, 0, 1);
btrfs_release_path(path);
if (ret > 0)
ret = 0;
}
if (!ret)
update_processed_blocks(rc, node);
} else {
ret = do_relocation(trans, rc, node, key, path, 1);
}
out:
if (ret || node->level == 0 || node->cowonly)
remove_backref_node(&rc->backref_cache, node);
return ret;
}
/*
* relocate a list of blocks
*/
static noinline_for_stack
int relocate_tree_blocks(struct btrfs_trans_handle *trans,
struct reloc_control *rc, struct rb_root *blocks)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct backref_node *node;
struct btrfs_path *path;
struct tree_block *block;
struct tree_block *next;
int ret;
int err = 0;
path = btrfs_alloc_path();
if (!path) {
err = -ENOMEM;
goto out_free_blocks;
}
/* Kick in readahead for tree blocks with missing keys */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
if (!block->key_ready)
readahead_tree_block(fs_info, block->bytenr);
}
/* Get first keys */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
if (!block->key_ready) {
err = get_tree_block_key(fs_info, block);
if (err)
goto out_free_path;
}
}
/* Do tree relocation */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
node = build_backref_tree(rc, &block->key,
block->level, block->bytenr);
if (IS_ERR(node)) {
err = PTR_ERR(node);
goto out;
}
ret = relocate_tree_block(trans, rc, node, &block->key,
path);
if (ret < 0) {
if (ret != -EAGAIN || &block->rb_node == rb_first(blocks))
err = ret;
goto out;
}
}
out:
err = finish_pending_nodes(trans, rc, path, err);
out_free_path:
btrfs_free_path(path);
out_free_blocks:
free_block_list(blocks);
return err;
}
static noinline_for_stack
int prealloc_file_extent_cluster(struct inode *inode,
struct file_extent_cluster *cluster)
{
u64 alloc_hint = 0;
u64 start;
u64 end;
u64 offset = BTRFS_I(inode)->index_cnt;
u64 num_bytes;
int nr = 0;
int ret = 0;
u64 prealloc_start = cluster->start - offset;
u64 prealloc_end = cluster->end - offset;
u64 cur_offset;
struct extent_changeset *data_reserved = NULL;
BUG_ON(cluster->start != cluster->boundary[0]);
inode_lock(inode);
ret = btrfs_check_data_free_space(inode, &data_reserved, prealloc_start,
prealloc_end + 1 - prealloc_start);
if (ret)
goto out;
cur_offset = prealloc_start;
while (nr < cluster->nr) {
start = cluster->boundary[nr] - offset;
if (nr + 1 < cluster->nr)
end = cluster->boundary[nr + 1] - 1 - offset;
else
end = cluster->end - offset;
lock_extent(&BTRFS_I(inode)->io_tree, start, end);
num_bytes = end + 1 - start;
if (cur_offset < start)
btrfs_free_reserved_data_space(inode, data_reserved,
cur_offset, start - cur_offset);
ret = btrfs_prealloc_file_range(inode, 0, start,
num_bytes, num_bytes,
end + 1, &alloc_hint);
cur_offset = end + 1;
unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
if (ret)
break;
nr++;
}
if (cur_offset < prealloc_end)
btrfs_free_reserved_data_space(inode, data_reserved,
cur_offset, prealloc_end + 1 - cur_offset);
out:
inode_unlock(inode);
extent_changeset_free(data_reserved);
return ret;
}
static noinline_for_stack
int setup_extent_mapping(struct inode *inode, u64 start, u64 end,
u64 block_start)
{
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_map *em;
int ret = 0;
em = alloc_extent_map();
if (!em)
return -ENOMEM;
em->start = start;
em->len = end + 1 - start;
em->block_len = em->len;
em->block_start = block_start;
set_bit(EXTENT_FLAG_PINNED, &em->flags);
lock_extent(&BTRFS_I(inode)->io_tree, start, end);
while (1) {
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em, 0);
write_unlock(&em_tree->lock);
if (ret != -EEXIST) {
free_extent_map(em);
break;
}
btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0);
}
unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
return ret;
}
static int relocate_file_extent_cluster(struct inode *inode,
struct file_extent_cluster *cluster)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
u64 page_start;
u64 page_end;
u64 offset = BTRFS_I(inode)->index_cnt;
unsigned long index;
unsigned long last_index;
struct page *page;
struct file_ra_state *ra;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
int nr = 0;
int ret = 0;
if (!cluster->nr)
return 0;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
if (!ra)
return -ENOMEM;
ret = prealloc_file_extent_cluster(inode, cluster);
if (ret)
goto out;
file_ra_state_init(ra, inode->i_mapping);
ret = setup_extent_mapping(inode, cluster->start - offset,
cluster->end - offset, cluster->start);
if (ret)
goto out;
index = (cluster->start - offset) >> PAGE_SHIFT;
last_index = (cluster->end - offset) >> PAGE_SHIFT;
while (index <= last_index) {
ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode),
PAGE_SIZE);
if (ret)
goto out;
page = find_lock_page(inode->i_mapping, index);
if (!page) {
page_cache_sync_readahead(inode->i_mapping,
ra, NULL, index,
last_index + 1 - index);
page = find_or_create_page(inode->i_mapping, index,
mask);
if (!page) {
btrfs_delalloc_release_metadata(BTRFS_I(inode),
PAGE_SIZE, true);
btrfs_delalloc_release_extents(BTRFS_I(inode),
PAGE_SIZE);
ret = -ENOMEM;
goto out;
}
}
if (PageReadahead(page)) {
page_cache_async_readahead(inode->i_mapping,
ra, NULL, page, index,
last_index + 1 - index);
}
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
lock_page(page);
if (!PageUptodate(page)) {
unlock_page(page);
put_page(page);
btrfs_delalloc_release_metadata(BTRFS_I(inode),
PAGE_SIZE, true);
btrfs_delalloc_release_extents(BTRFS_I(inode),
PAGE_SIZE);
ret = -EIO;
goto out;
}
}
page_start = page_offset(page);
page_end = page_start + PAGE_SIZE - 1;
lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end);
set_page_extent_mapped(page);
if (nr < cluster->nr &&
page_start + offset == cluster->boundary[nr]) {
set_extent_bits(&BTRFS_I(inode)->io_tree,
page_start, page_end,
EXTENT_BOUNDARY);
nr++;
}
ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0,
NULL);
if (ret) {
unlock_page(page);
put_page(page);
btrfs_delalloc_release_metadata(BTRFS_I(inode),
PAGE_SIZE, true);
btrfs_delalloc_release_extents(BTRFS_I(inode),
PAGE_SIZE);
clear_extent_bits(&BTRFS_I(inode)->io_tree,
page_start, page_end,
EXTENT_LOCKED | EXTENT_BOUNDARY);
goto out;
}
set_page_dirty(page);
unlock_extent(&BTRFS_I(inode)->io_tree,
page_start, page_end);
unlock_page(page);
put_page(page);
index++;
btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
balance_dirty_pages_ratelimited(inode->i_mapping);
btrfs_throttle(fs_info);
}
WARN_ON(nr != cluster->nr);
out:
kfree(ra);
return ret;
}
static noinline_for_stack
int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key,
struct file_extent_cluster *cluster)
{
int ret;
if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) {
ret = relocate_file_extent_cluster(inode, cluster);
if (ret)
return ret;
cluster->nr = 0;
}
if (!cluster->nr)
cluster->start = extent_key->objectid;
else
BUG_ON(cluster->nr >= MAX_EXTENTS);
cluster->end = extent_key->objectid + extent_key->offset - 1;
cluster->boundary[cluster->nr] = extent_key->objectid;
cluster->nr++;
if (cluster->nr >= MAX_EXTENTS) {
ret = relocate_file_extent_cluster(inode, cluster);
if (ret)
return ret;
cluster->nr = 0;
}
return 0;
}
/*
* helper to add a tree block to the list.
* the major work is getting the generation and level of the block
*/
static int add_tree_block(struct reloc_control *rc,
struct btrfs_key *extent_key,
struct btrfs_path *path,
struct rb_root *blocks)
{
struct extent_buffer *eb;
struct btrfs_extent_item *ei;
struct btrfs_tree_block_info *bi;
struct tree_block *block;
struct rb_node *rb_node;
u32 item_size;
int level = -1;
u64 generation;
eb = path->nodes[0];
item_size = btrfs_item_size_nr(eb, path->slots[0]);
if (extent_key->type == BTRFS_METADATA_ITEM_KEY ||
item_size >= sizeof(*ei) + sizeof(*bi)) {
ei = btrfs_item_ptr(eb, path->slots[0],
struct btrfs_extent_item);
if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) {
bi = (struct btrfs_tree_block_info *)(ei + 1);
level = btrfs_tree_block_level(eb, bi);
} else {
level = (int)extent_key->offset;
}
generation = btrfs_extent_generation(eb, ei);
} else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) {
btrfs_print_v0_err(eb->fs_info);
btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
return -EINVAL;
} else {
BUG();
}
btrfs_release_path(path);
BUG_ON(level == -1);
block = kmalloc(sizeof(*block), GFP_NOFS);
if (!block)
return -ENOMEM;
block->bytenr = extent_key->objectid;
block->key.objectid = rc->extent_root->fs_info->nodesize;
block->key.offset = generation;
block->level = level;
block->key_ready = 0;
rb_node = tree_insert(blocks, block->bytenr, &block->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, block->bytenr);
return 0;
}
/*
* helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY
*/
static int __add_tree_block(struct reloc_control *rc,
u64 bytenr, u32 blocksize,
struct rb_root *blocks)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct btrfs_path *path;
struct btrfs_key key;
int ret;
bool skinny = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
if (tree_block_processed(bytenr, rc))
return 0;
if (tree_search(blocks, bytenr))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
again:
key.objectid = bytenr;
if (skinny) {
key.type = BTRFS_METADATA_ITEM_KEY;
key.offset = (u64)-1;
} else {
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = blocksize;
}
path->search_commit_root = 1;
path->skip_locking = 1;
ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0 && skinny) {
if (path->slots[0]) {
path->slots[0]--;
btrfs_item_key_to_cpu(path->nodes[0], &key,
path->slots[0]);
if (key.objectid == bytenr &&
(key.type == BTRFS_METADATA_ITEM_KEY ||
(key.type == BTRFS_EXTENT_ITEM_KEY &&
key.offset == blocksize)))
ret = 0;
}
if (ret) {
skinny = false;
btrfs_release_path(path);
goto again;
}
}
if (ret) {
ASSERT(ret == 1);
btrfs_print_leaf(path->nodes[0]);
btrfs_err(fs_info,
"tree block extent item (%llu) is not found in extent tree",
bytenr);
WARN_ON(1);
ret = -EINVAL;
goto out;
}
ret = add_tree_block(rc, &key, path, blocks);
out:
btrfs_free_path(path);
return ret;
}
/*
* helper to check if the block use full backrefs for pointers in it
*/
static int block_use_full_backref(struct reloc_control *rc,
struct extent_buffer *eb)
{
u64 flags;
int ret;
if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) ||
btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV)
return 1;
ret = btrfs_lookup_extent_info(NULL, rc->extent_root->fs_info,
eb->start, btrfs_header_level(eb), 1,
NULL, &flags);
BUG_ON(ret);
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)
ret = 1;
else
ret = 0;
return ret;
}
static int delete_block_group_cache(struct btrfs_fs_info *fs_info,
struct btrfs_block_group *block_group,
struct inode *inode,
u64 ino)
{
struct btrfs_key key;
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_trans_handle *trans;
int ret = 0;
if (inode)
goto truncate;
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(fs_info->sb, &key, root);
if (IS_ERR(inode))
return -ENOENT;
truncate:
ret = btrfs_check_trunc_cache_free_space(fs_info,
&fs_info->global_block_rsv);
if (ret)
goto out;
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
ret = btrfs_truncate_free_space_cache(trans, block_group, inode);
btrfs_end_transaction(trans);
btrfs_btree_balance_dirty(fs_info);
out:
iput(inode);
return ret;
}
/*
* helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY
* this function scans fs tree to find blocks reference the data extent
*/
static int find_data_references(struct reloc_control *rc,
struct btrfs_key *extent_key,
struct extent_buffer *leaf,
struct btrfs_extent_data_ref *ref,
struct rb_root *blocks)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct btrfs_path *path;
struct tree_block *block;
struct btrfs_root *root;
struct btrfs_file_extent_item *fi;
struct rb_node *rb_node;
struct btrfs_key key;
u64 ref_root;
u64 ref_objectid;
u64 ref_offset;
u32 ref_count;
u32 nritems;
int err = 0;
int added = 0;
int counted;
int ret;
ref_root = btrfs_extent_data_ref_root(leaf, ref);
ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref);
ref_offset = btrfs_extent_data_ref_offset(leaf, ref);
ref_count = btrfs_extent_data_ref_count(leaf, ref);
/*
* This is an extent belonging to the free space cache, lets just delete
* it and redo the search.
*/
if (ref_root == BTRFS_ROOT_TREE_OBJECTID) {
ret = delete_block_group_cache(fs_info, rc->block_group,
NULL, ref_objectid);
if (ret != -ENOENT)
return ret;
ret = 0;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = READA_FORWARD;
root = read_fs_root(fs_info, ref_root);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out_free;
}
key.objectid = ref_objectid;
key.type = BTRFS_EXTENT_DATA_KEY;
if (ref_offset > ((u64)-1 << 32))
key.offset = 0;
else
key.offset = ref_offset;
path->search_commit_root = 1;
path->skip_locking = 1;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
err = ret;
goto out;
}
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
/*
* the references in tree blocks that use full backrefs
* are not counted in
*/
if (block_use_full_backref(rc, leaf))
counted = 0;
else
counted = 1;
rb_node = tree_search(blocks, leaf->start);
if (rb_node) {
if (counted)
added = 1;
else
path->slots[0] = nritems;
}
while (ref_count > 0) {
while (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret < 0) {
err = ret;
goto out;
}
if (WARN_ON(ret > 0))
goto out;
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
added = 0;
if (block_use_full_backref(rc, leaf))
counted = 0;
else
counted = 1;
rb_node = tree_search(blocks, leaf->start);
if (rb_node) {
if (counted)
added = 1;
else
path->slots[0] = nritems;
}
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (WARN_ON(key.objectid != ref_objectid ||
key.type != BTRFS_EXTENT_DATA_KEY))
break;
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(leaf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
goto next;
if (btrfs_file_extent_disk_bytenr(leaf, fi) !=
extent_key->objectid)
goto next;
key.offset -= btrfs_file_extent_offset(leaf, fi);
if (key.offset != ref_offset)
goto next;
if (counted)
ref_count--;
if (added)
goto next;
if (!tree_block_processed(leaf->start, rc)) {
block = kmalloc(sizeof(*block), GFP_NOFS);
if (!block) {
err = -ENOMEM;
break;
}
block->bytenr = leaf->start;
btrfs_item_key_to_cpu(leaf, &block->key, 0);
block->level = 0;
block->key_ready = 1;
rb_node = tree_insert(blocks, block->bytenr,
&block->rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST,
block->bytenr);
}
if (counted)
added = 1;
else
path->slots[0] = nritems;
next:
path->slots[0]++;
}
out:
btrfs_put_fs_root(root);
out_free:
btrfs_free_path(path);
return err;
}
/*
* helper to find all tree blocks that reference a given data extent
*/
static noinline_for_stack
int add_data_references(struct reloc_control *rc,
struct btrfs_key *extent_key,
struct btrfs_path *path,
struct rb_root *blocks)
{
struct btrfs_key key;
struct extent_buffer *eb;
struct btrfs_extent_data_ref *dref;
struct btrfs_extent_inline_ref *iref;
unsigned long ptr;
unsigned long end;
u32 blocksize = rc->extent_root->fs_info->nodesize;
int ret = 0;
int err = 0;
eb = path->nodes[0];
ptr = btrfs_item_ptr_offset(eb, path->slots[0]);
end = ptr + btrfs_item_size_nr(eb, path->slots[0]);
ptr += sizeof(struct btrfs_extent_item);
while (ptr < end) {
iref = (struct btrfs_extent_inline_ref *)ptr;
key.type = btrfs_get_extent_inline_ref_type(eb, iref,
BTRFS_REF_TYPE_DATA);
if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
key.offset = btrfs_extent_inline_ref_offset(eb, iref);
ret = __add_tree_block(rc, key.offset, blocksize,
blocks);
} else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
ret = find_data_references(rc, extent_key,
eb, dref, blocks);
} else {
ret = -EUCLEAN;
btrfs_err(rc->extent_root->fs_info,
"extent %llu slot %d has an invalid inline ref type",
eb->start, path->slots[0]);
}
if (ret) {
err = ret;
goto out;
}
ptr += btrfs_extent_inline_ref_size(key.type);
}
WARN_ON(ptr > end);
while (1) {
cond_resched();
eb = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(eb)) {
ret = btrfs_next_leaf(rc->extent_root, path);
if (ret < 0) {
err = ret;
break;
}
if (ret > 0)
break;
eb = path->nodes[0];
}
btrfs_item_key_to_cpu(eb, &key, path->slots[0]);
if (key.objectid != extent_key->objectid)
break;
if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
ret = __add_tree_block(rc, key.offset, blocksize,
blocks);
} else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
dref = btrfs_item_ptr(eb, path->slots[0],
struct btrfs_extent_data_ref);
ret = find_data_references(rc, extent_key,
eb, dref, blocks);
} else if (unlikely(key.type == BTRFS_EXTENT_REF_V0_KEY)) {
btrfs_print_v0_err(eb->fs_info);
btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
ret = -EINVAL;
} else {
ret = 0;
}
if (ret) {
err = ret;
break;
}
path->slots[0]++;
}
out:
btrfs_release_path(path);
if (err)
free_block_list(blocks);
return err;
}
/*
* helper to find next unprocessed extent
*/
static noinline_for_stack
int find_next_extent(struct reloc_control *rc, struct btrfs_path *path,
struct btrfs_key *extent_key)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct btrfs_key key;
struct extent_buffer *leaf;
u64 start, end, last;
int ret;
last = rc->block_group->start + rc->block_group->length;
while (1) {
cond_resched();
if (rc->search_start >= last) {
ret = 1;
break;
}
key.objectid = rc->search_start;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
path->search_commit_root = 1;
path->skip_locking = 1;
ret = btrfs_search_slot(NULL, rc->extent_root, &key, path,
0, 0);
if (ret < 0)
break;
next:
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(rc->extent_root, path);
if (ret != 0)
break;
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid >= last) {
ret = 1;
break;
}
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY) {
path->slots[0]++;
goto next;
}
if (key.type == BTRFS_EXTENT_ITEM_KEY &&
key.objectid + key.offset <= rc->search_start) {
path->slots[0]++;
goto next;
}
if (key.type == BTRFS_METADATA_ITEM_KEY &&
key.objectid + fs_info->nodesize <=
rc->search_start) {
path->slots[0]++;
goto next;
}
ret = find_first_extent_bit(&rc->processed_blocks,
key.objectid, &start, &end,
EXTENT_DIRTY, NULL);
if (ret == 0 && start <= key.objectid) {
btrfs_release_path(path);
rc->search_start = end + 1;
} else {
if (key.type == BTRFS_EXTENT_ITEM_KEY)
rc->search_start = key.objectid + key.offset;
else
rc->search_start = key.objectid +
fs_info->nodesize;
memcpy(extent_key, &key, sizeof(key));
return 0;
}
}
btrfs_release_path(path);
return ret;
}
static void set_reloc_control(struct reloc_control *rc)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
mutex_lock(&fs_info->reloc_mutex);
fs_info->reloc_ctl = rc;
mutex_unlock(&fs_info->reloc_mutex);
}
static void unset_reloc_control(struct reloc_control *rc)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
mutex_lock(&fs_info->reloc_mutex);
fs_info->reloc_ctl = NULL;
mutex_unlock(&fs_info->reloc_mutex);
}
static int check_extent_flags(u64 flags)
{
if ((flags & BTRFS_EXTENT_FLAG_DATA) &&
(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
return 1;
if (!(flags & BTRFS_EXTENT_FLAG_DATA) &&
!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
return 1;
if ((flags & BTRFS_EXTENT_FLAG_DATA) &&
(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF))
return 1;
return 0;
}
static noinline_for_stack
int prepare_to_relocate(struct reloc_control *rc)
{
struct btrfs_trans_handle *trans;
int ret;
rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root->fs_info,
BTRFS_BLOCK_RSV_TEMP);
if (!rc->block_rsv)
return -ENOMEM;
memset(&rc->cluster, 0, sizeof(rc->cluster));
rc->search_start = rc->block_group->start;
rc->extents_found = 0;
rc->nodes_relocated = 0;
rc->merging_rsv_size = 0;
rc->reserved_bytes = 0;
rc->block_rsv->size = rc->extent_root->fs_info->nodesize *
RELOCATION_RESERVED_NODES;
ret = btrfs_block_rsv_refill(rc->extent_root,
rc->block_rsv, rc->block_rsv->size,
BTRFS_RESERVE_FLUSH_ALL);
if (ret)
return ret;
rc->create_reloc_tree = 1;
set_reloc_control(rc);
trans = btrfs_join_transaction(rc->extent_root);
if (IS_ERR(trans)) {
unset_reloc_control(rc);
/*
* extent tree is not a ref_cow tree and has no reloc_root to
* cleanup. And callers are responsible to free the above
* block rsv.
*/
return PTR_ERR(trans);
}
btrfs_commit_transaction(trans);
return 0;
}
static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
{
struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
struct rb_root blocks = RB_ROOT;
struct btrfs_key key;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
u64 flags;
u32 item_size;
int ret;
int err = 0;
int progress = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = READA_FORWARD;
ret = prepare_to_relocate(rc);
if (ret) {
err = ret;
goto out_free;
}
while (1) {
rc->reserved_bytes = 0;
ret = btrfs_block_rsv_refill(rc->extent_root,
rc->block_rsv, rc->block_rsv->size,
BTRFS_RESERVE_FLUSH_ALL);
if (ret) {
err = ret;
break;
}
progress++;
trans = btrfs_start_transaction(rc->extent_root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
trans = NULL;
break;
}
restart:
if (update_backref_cache(trans, &rc->backref_cache)) {
btrfs_end_transaction(trans);
trans = NULL;
continue;
}
ret = find_next_extent(rc, path, &key);
if (ret < 0)
err = ret;
if (ret != 0)
break;
rc->extents_found++;
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]);
if (item_size >= sizeof(*ei)) {
flags = btrfs_extent_flags(path->nodes[0], ei);
ret = check_extent_flags(flags);
BUG_ON(ret);
} else if (unlikely(item_size == sizeof(struct btrfs_extent_item_v0))) {
err = -EINVAL;
btrfs_print_v0_err(trans->fs_info);
btrfs_abort_transaction(trans, err);
break;
} else {
BUG();
}
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
ret = add_tree_block(rc, &key, path, &blocks);
} else if (rc->stage == UPDATE_DATA_PTRS &&
(flags & BTRFS_EXTENT_FLAG_DATA)) {
ret = add_data_references(rc, &key, path, &blocks);
} else {
btrfs_release_path(path);
ret = 0;
}
if (ret < 0) {
err = ret;
break;
}
if (!RB_EMPTY_ROOT(&blocks)) {
ret = relocate_tree_blocks(trans, rc, &blocks);
if (ret < 0) {
/*
* if we fail to relocate tree blocks, force to update
* backref cache when committing transaction.
*/
rc->backref_cache.last_trans = trans->transid - 1;
if (ret != -EAGAIN) {
err = ret;
break;
}
rc->extents_found--;
rc->search_start = key.objectid;
}
}
btrfs_end_transaction_throttle(trans);
btrfs_btree_balance_dirty(fs_info);
trans = NULL;
if (rc->stage == MOVE_DATA_EXTENTS &&
(flags & BTRFS_EXTENT_FLAG_DATA)) {
rc->found_file_extent = 1;
ret = relocate_data_extent(rc->data_inode,
&key, &rc->cluster);
if (ret < 0) {
err = ret;
break;
}
}
}
if (trans && progress && err == -ENOSPC) {
ret = btrfs_force_chunk_alloc(trans, rc->block_group->flags);
if (ret == 1) {
err = 0;
progress = 0;
goto restart;
}
}
btrfs_release_path(path);
clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY);
if (trans) {
btrfs_end_transaction_throttle(trans);
btrfs_btree_balance_dirty(fs_info);
}
if (!err) {
ret = relocate_file_extent_cluster(rc->data_inode,
&rc->cluster);
if (ret < 0)
err = ret;
}
rc->create_reloc_tree = 0;
set_reloc_control(rc);
backref_cache_cleanup(&rc->backref_cache);
btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1);
err = prepare_to_merge(rc, err);
merge_reloc_roots(rc);
rc->merge_reloc_tree = 0;
unset_reloc_control(rc);
btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1);
/* get rid of pinned extents */
trans = btrfs_join_transaction(rc->extent_root);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto out_free;
}
btrfs_commit_transaction(trans);
ret = clean_dirty_subvols(rc);
if (ret < 0 && !err)
err = ret;
out_free:
btrfs_free_block_rsv(fs_info, rc->block_rsv);
btrfs_free_path(path);
return err;
}
static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid)
{
struct btrfs_path *path;
struct btrfs_inode_item *item;
struct extent_buffer *leaf;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_insert_empty_inode(trans, root, path, objectid);
if (ret)
goto out;
leaf = path->nodes[0];
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item));
btrfs_set_inode_generation(leaf, item, 1);
btrfs_set_inode_size(leaf, item, 0);
btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS |
BTRFS_INODE_PREALLOC);
btrfs_mark_buffer_dirty(leaf);
out:
btrfs_free_path(path);
return ret;
}
/*
* helper to create inode for data relocation.
* the inode is in data relocation tree and its link count is 0
*/
static noinline_for_stack
struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
struct btrfs_block_group *group)
{
struct inode *inode = NULL;
struct btrfs_trans_handle *trans;
struct btrfs_root *root;
struct btrfs_key key;
u64 objectid;
int err = 0;
root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID);
if (IS_ERR(root))
return ERR_CAST(root);
trans = btrfs_start_transaction(root, 6);
if (IS_ERR(trans)) {
btrfs_put_fs_root(root);
return ERR_CAST(trans);
}
err = btrfs_find_free_objectid(root, &objectid);
if (err)
goto out;
err = __insert_orphan_inode(trans, root, objectid);
BUG_ON(err);
key.objectid = objectid;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(fs_info->sb, &key, root);
BUG_ON(IS_ERR(inode));
BTRFS_I(inode)->index_cnt = group->start;
err = btrfs_orphan_add(trans, BTRFS_I(inode));
out:
btrfs_put_fs_root(root);
btrfs_end_transaction(trans);
btrfs_btree_balance_dirty(fs_info);
if (err) {
if (inode)
iput(inode);
inode = ERR_PTR(err);
}
return inode;
}
static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
{
struct reloc_control *rc;
rc = kzalloc(sizeof(*rc), GFP_NOFS);
if (!rc)
return NULL;
INIT_LIST_HEAD(&rc->reloc_roots);
INIT_LIST_HEAD(&rc->dirty_subvol_roots);
backref_cache_init(&rc->backref_cache);
mapping_tree_init(&rc->reloc_root_tree);
extent_io_tree_init(fs_info, &rc->processed_blocks,
IO_TREE_RELOC_BLOCKS, NULL);
return rc;
}
/*
* Print the block group being relocated
*/
static void describe_relocation(struct btrfs_fs_info *fs_info,
struct btrfs_block_group *block_group)
{
char buf[128] = {'\0'};
btrfs_describe_block_groups(block_group->flags, buf, sizeof(buf));
btrfs_info(fs_info,
"relocating block group %llu flags %s",
block_group->start, buf);
}
static const char *stage_to_string(int stage)
{
if (stage == MOVE_DATA_EXTENTS)
return "move data extents";
if (stage == UPDATE_DATA_PTRS)
return "update data pointers";
return "unknown";
}
/*
* function to relocate all extents in a block group.
*/
int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
{
struct btrfs_block_group *bg;
struct btrfs_root *extent_root = fs_info->extent_root;
struct reloc_control *rc;
struct inode *inode;
struct btrfs_path *path;
int ret;
int rw = 0;
int err = 0;
bg = btrfs_lookup_block_group(fs_info, group_start);
if (!bg)
return -ENOENT;
if (btrfs_pinned_by_swapfile(fs_info, bg)) {
btrfs_put_block_group(bg);
return -ETXTBSY;
}
rc = alloc_reloc_control(fs_info);
if (!rc) {
btrfs_put_block_group(bg);
return -ENOMEM;
}
rc->extent_root = extent_root;
rc->block_group = bg;
ret = btrfs_inc_block_group_ro(rc->block_group, true);
if (ret) {
err = ret;
goto out;
}
rw = 1;
path = btrfs_alloc_path();
if (!path) {
err = -ENOMEM;
goto out;
}
inode = lookup_free_space_inode(rc->block_group, path);
btrfs_free_path(path);
if (!IS_ERR(inode))
ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0);
else
ret = PTR_ERR(inode);
if (ret && ret != -ENOENT) {
err = ret;
goto out;
}
rc->data_inode = create_reloc_inode(fs_info, rc->block_group);
if (IS_ERR(rc->data_inode)) {
err = PTR_ERR(rc->data_inode);
rc->data_inode = NULL;
goto out;
}
describe_relocation(fs_info, rc->block_group);
btrfs_wait_block_group_reservations(rc->block_group);
btrfs_wait_nocow_writers(rc->block_group);
btrfs_wait_ordered_roots(fs_info, U64_MAX,
rc->block_group->start,
rc->block_group->length);
while (1) {
int finishes_stage;
mutex_lock(&fs_info->cleaner_mutex);
ret = relocate_block_group(rc);
mutex_unlock(&fs_info->cleaner_mutex);
if (ret < 0)
err = ret;
finishes_stage = rc->stage;
/*
* We may have gotten ENOSPC after we already dirtied some
* extents. If writeout happens while we're relocating a
* different block group we could end up hitting the
* BUG_ON(rc->stage == UPDATE_DATA_PTRS) in
* btrfs_reloc_cow_block. Make sure we write everything out
* properly so we don't trip over this problem, and then break
* out of the loop if we hit an error.
*/
if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) {
ret = btrfs_wait_ordered_range(rc->data_inode, 0,
(u64)-1);
if (ret)
err = ret;
invalidate_mapping_pages(rc->data_inode->i_mapping,
0, -1);
rc->stage = UPDATE_DATA_PTRS;
}
if (err < 0)
goto out;
if (rc->extents_found == 0)
break;
btrfs_info(fs_info, "found %llu extents, stage: %s",
rc->extents_found, stage_to_string(finishes_stage));
}
WARN_ON(rc->block_group->pinned > 0);
WARN_ON(rc->block_group->reserved > 0);
WARN_ON(rc->block_group->used > 0);
out:
if (err && rw)
btrfs_dec_block_group_ro(rc->block_group);
iput(rc->data_inode);
btrfs_put_block_group(rc->block_group);
kfree(rc);
return err;
}
static noinline_for_stack int mark_garbage_root(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_trans_handle *trans;
int ret, err;
trans = btrfs_start_transaction(fs_info->tree_root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
memset(&root->root_item.drop_progress, 0,
sizeof(root->root_item.drop_progress));
root->root_item.drop_level = 0;
btrfs_set_root_refs(&root->root_item, 0);
ret = btrfs_update_root(trans, fs_info->tree_root,
&root->root_key, &root->root_item);
err = btrfs_end_transaction(trans);
if (err)
return err;
return ret;
}
/*
* recover relocation interrupted by system crash.
*
* this function resumes merging reloc trees with corresponding fs trees.
* this is important for keeping the sharing of tree blocks
*/
int btrfs_recover_relocation(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
LIST_HEAD(reloc_roots);
struct btrfs_key key;
struct btrfs_root *fs_root;
struct btrfs_root *reloc_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct reloc_control *rc = NULL;
struct btrfs_trans_handle *trans;
int ret;
int err = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = READA_BACK;
key.objectid = BTRFS_TREE_RELOC_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
while (1) {
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key,
path, 0, 0);
if (ret < 0) {
err = ret;
goto out;
}
if (ret > 0) {
if (path->slots[0] == 0)
break;
path->slots[0]--;
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
btrfs_release_path(path);
if (key.objectid != BTRFS_TREE_RELOC_OBJECTID ||
key.type != BTRFS_ROOT_ITEM_KEY)
break;
reloc_root = btrfs_read_tree_root(root, &key);
if (IS_ERR(reloc_root)) {
err = PTR_ERR(reloc_root);
goto out;
}
set_bit(BTRFS_ROOT_REF_COWS, &reloc_root->state);
list_add(&reloc_root->root_list, &reloc_roots);
if (btrfs_root_refs(&reloc_root->root_item) > 0) {
fs_root = read_fs_root(fs_info,
reloc_root->root_key.offset);
if (IS_ERR(fs_root)) {
ret = PTR_ERR(fs_root);
if (ret != -ENOENT) {
err = ret;
goto out;
}
ret = mark_garbage_root(reloc_root);
if (ret < 0) {
err = ret;
goto out;
}
} else {
btrfs_put_fs_root(fs_root);
}
}
if (key.offset == 0)
break;
key.offset--;
}
btrfs_release_path(path);
if (list_empty(&reloc_roots))
goto out;
rc = alloc_reloc_control(fs_info);
if (!rc) {
err = -ENOMEM;
goto out;
}
rc->extent_root = fs_info->extent_root;
set_reloc_control(rc);
trans = btrfs_join_transaction(rc->extent_root);
if (IS_ERR(trans)) {
unset_reloc_control(rc);
err = PTR_ERR(trans);
goto out_free;
}
rc->merge_reloc_tree = 1;
while (!list_empty(&reloc_roots)) {
reloc_root = list_entry(reloc_roots.next,
struct btrfs_root, root_list);
list_del(&reloc_root->root_list);
if (btrfs_root_refs(&reloc_root->root_item) == 0) {
list_add_tail(&reloc_root->root_list,
&rc->reloc_roots);
continue;
}
fs_root = read_fs_root(fs_info, reloc_root->root_key.offset);
if (IS_ERR(fs_root)) {
err = PTR_ERR(fs_root);
list_add_tail(&reloc_root->root_list, &reloc_roots);
goto out_free;
}
err = __add_reloc_root(reloc_root);
BUG_ON(err < 0); /* -ENOMEM or logic error */
fs_root->reloc_root = reloc_root;
btrfs_put_fs_root(fs_root);
}
err = btrfs_commit_transaction(trans);
if (err)
goto out_free;
merge_reloc_roots(rc);
unset_reloc_control(rc);
trans = btrfs_join_transaction(rc->extent_root);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto out_free;
}
err = btrfs_commit_transaction(trans);
ret = clean_dirty_subvols(rc);
if (ret < 0 && !err)
err = ret;
out_free:
kfree(rc);
out:
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
btrfs_free_path(path);
if (err == 0) {
/* cleanup orphan inode in data relocation tree */
fs_root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID);
if (IS_ERR(fs_root)) {
err = PTR_ERR(fs_root);
} else {
err = btrfs_orphan_cleanup(fs_root);
btrfs_put_fs_root(fs_root);
}
}
return err;
}
/*
* helper to add ordered checksum for data relocation.
*
* cloning checksum properly handles the nodatasum extents.
* it also saves CPU time to re-calculate the checksum.
*/
int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_ordered_sum *sums;
struct btrfs_ordered_extent *ordered;
int ret;
u64 disk_bytenr;
u64 new_bytenr;
LIST_HEAD(list);
ordered = btrfs_lookup_ordered_extent(inode, file_pos);
BUG_ON(ordered->file_offset != file_pos || ordered->num_bytes != len);
disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
ret = btrfs_lookup_csums_range(fs_info->csum_root, disk_bytenr,
disk_bytenr + len - 1, &list, 0);
if (ret)
goto out;
while (!list_empty(&list)) {
sums = list_entry(list.next, struct btrfs_ordered_sum, list);
list_del_init(&sums->list);
/*
* We need to offset the new_bytenr based on where the csum is.
* We need to do this because we will read in entire prealloc
* extents but we may have written to say the middle of the
* prealloc extent, so we need to make sure the csum goes with
* the right disk offset.
*
* We can do this because the data reloc inode refers strictly
* to the on disk bytes, so we don't have to worry about
* disk_len vs real len like with real inodes since it's all
* disk length.
*/
new_bytenr = ordered->disk_bytenr + sums->bytenr - disk_bytenr;
sums->bytenr = new_bytenr;
btrfs_add_ordered_sum(ordered, sums);
}
out:
btrfs_put_ordered_extent(ordered);
return ret;
}
int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *cow)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct reloc_control *rc;
struct backref_node *node;
int first_cow = 0;
int level;
int ret = 0;
rc = fs_info->reloc_ctl;
if (!rc)
return 0;
BUG_ON(rc->stage == UPDATE_DATA_PTRS &&
root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID);
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
if (buf == root->node)
__update_reloc_root(root, cow->start);
}
level = btrfs_header_level(buf);
if (btrfs_header_generation(buf) <=
btrfs_root_last_snapshot(&root->root_item))
first_cow = 1;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID &&
rc->create_reloc_tree) {
WARN_ON(!first_cow && level == 0);
node = rc->backref_cache.path[level];
BUG_ON(node->bytenr != buf->start &&
node->new_bytenr != buf->start);
drop_node_buffer(node);
atomic_inc(&cow->refs);
node->eb = cow;
node->new_bytenr = cow->start;
if (!node->pending) {
list_move_tail(&node->list,
&rc->backref_cache.pending[level]);
node->pending = 1;
}
if (first_cow)
__mark_block_processed(rc, node);
if (first_cow && level > 0)
rc->nodes_relocated += buf->len;
}
if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS)
ret = replace_file_extents(trans, rc, root, cow);
return ret;
}
/*
* called before creating snapshot. it calculates metadata reservation
* required for relocating tree blocks in the snapshot
*/
void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
u64 *bytes_to_reserve)
{
struct btrfs_root *root = pending->root;
struct reloc_control *rc = root->fs_info->reloc_ctl;
if (!rc || !have_reloc_root(root))
return;
if (!rc->merge_reloc_tree)
return;
root = root->reloc_root;
BUG_ON(btrfs_root_refs(&root->root_item) == 0);
/*
* relocation is in the stage of merging trees. the space
* used by merging a reloc tree is twice the size of
* relocated tree nodes in the worst case. half for cowing
* the reloc tree, half for cowing the fs tree. the space
* used by cowing the reloc tree will be freed after the
* tree is dropped. if we create snapshot, cowing the fs
* tree may use more space than it frees. so we need
* reserve extra space.
*/
*bytes_to_reserve += rc->nodes_relocated;
}
/*
* called after snapshot is created. migrate block reservation
* and create reloc root for the newly created snapshot
*/
int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending)
{
struct btrfs_root *root = pending->root;
struct btrfs_root *reloc_root;
struct btrfs_root *new_root;
struct reloc_control *rc = root->fs_info->reloc_ctl;
int ret;
if (!rc || !have_reloc_root(root))
return 0;
rc = root->fs_info->reloc_ctl;
rc->merging_rsv_size += rc->nodes_relocated;
if (rc->merge_reloc_tree) {
ret = btrfs_block_rsv_migrate(&pending->block_rsv,
rc->block_rsv,
rc->nodes_relocated, true);
if (ret)
return ret;
}
new_root = pending->snap;
reloc_root = create_reloc_root(trans, root->reloc_root,
new_root->root_key.objectid);
if (IS_ERR(reloc_root))
return PTR_ERR(reloc_root);
ret = __add_reloc_root(reloc_root);
BUG_ON(ret < 0);
new_root->reloc_root = reloc_root;
if (rc->create_reloc_tree)
ret = clone_backref_node(trans, rc, root, reloc_root);
return ret;
}
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