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Btrfs: Add back pointers from extents to the btree or file referencing them 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-12-11 09:25:06 -05:00
parent 74493f7a59
commit 7bb86316c3
8 changed files with 577 additions and 105 deletions
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196
fs/btrfs/ctree.c
View File

@ -77,13 +77,37 @@ static int __btrfs_cow_block(struct btrfs_trans_handle *trans,
struct extent_buffer **cow_ret,
u64 search_start, u64 empty_size)
{
u64 root_gen;
struct extent_buffer *cow;
u32 nritems;
int ret = 0;
int different_trans = 0;
int level;
struct btrfs_key first_key;
if (root->ref_cows) {
root_gen = trans->transid;
} else {
root_gen = 0;
}
WARN_ON(root->ref_cows && trans->transid !=
root->fs_info->running_transaction->transid);
WARN_ON(root->ref_cows && trans->transid != root->last_trans);
cow = btrfs_alloc_free_block(trans, root, buf->len,
level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
if (nritems) {
if (level == 0)
btrfs_item_key_to_cpu(buf, &first_key, 0);
else
btrfs_node_key_to_cpu(buf, &first_key, 0);
} else {
first_key.objectid = 0;
}
cow = __btrfs_alloc_free_block(trans, root, buf->len,
root->root_key.objectid,
root_gen, first_key.objectid, level,
search_start, empty_size);
if (IS_ERR(cow))
return PTR_ERR(cow);
@ -104,14 +128,17 @@ static int __btrfs_cow_block(struct btrfs_trans_handle *trans,
}
if (buf == root->node) {
root_gen = btrfs_header_generation(buf);
root->node = cow;
extent_buffer_get(cow);
if (buf != root->commit_root) {
btrfs_free_extent(trans, root, buf->start,
buf->len, 1);
buf->len, root->root_key.objectid,
root_gen, 0, 0, 1);
}
free_extent_buffer(buf);
} else {
root_gen = btrfs_header_generation(parent);
btrfs_set_node_blockptr(parent, parent_slot,
cow->start);
WARN_ON(trans->transid == 0);
@ -119,7 +146,9 @@ static int __btrfs_cow_block(struct btrfs_trans_handle *trans,
trans->transid);
btrfs_mark_buffer_dirty(parent);
WARN_ON(btrfs_header_generation(parent) != trans->transid);
btrfs_free_extent(trans, root, buf->start, buf->len, 1);
btrfs_free_extent(trans, root, buf->start, buf->len,
btrfs_header_owner(parent), root_gen,
0, 0, 1);
}
free_extent_buffer(buf);
btrfs_mark_buffer_dirty(cow);
@ -606,6 +635,8 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
return 0;
mid = path->nodes[level];
WARN_ON(btrfs_header_generation(mid) != trans->transid);
orig_ptr = btrfs_node_blockptr(mid, orig_slot);
if (level < BTRFS_MAX_LEVEL - 1)
@ -631,7 +662,9 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
wait_on_tree_block_writeback(root, mid);
/* once for the path */
free_extent_buffer(mid);
ret = btrfs_free_extent(trans, root, mid->start, mid->len, 1);
ret = btrfs_free_extent(trans, root, mid->start, mid->len,
root->root_key.objectid,
btrfs_header_generation(mid), 0, 0, 1);
/* once for the root ptr */
free_extent_buffer(mid);
return ret;
@ -681,6 +714,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
ret = wret;
if (btrfs_header_nritems(right) == 0) {
u64 bytenr = right->start;
u64 generation = btrfs_header_generation(parent);
u32 blocksize = right->len;
clean_tree_block(trans, root, right);
@ -692,7 +726,9 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr,
blocksize, 1);
blocksize,
btrfs_header_owner(parent),
generation, 0, 0, 1);
if (wret)
ret = wret;
} else {
@ -722,6 +758,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
}
if (btrfs_header_nritems(mid) == 0) {
/* we've managed to empty the middle node, drop it */
u64 root_gen = btrfs_header_generation(parent);
u64 bytenr = mid->start;
u32 blocksize = mid->len;
clean_tree_block(trans, root, mid);
@ -731,7 +768,9 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root
wret = del_ptr(trans, root, path, level + 1, pslot);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr, blocksize, 1);
wret = btrfs_free_extent(trans, root, bytenr, blocksize,
btrfs_header_owner(parent),
root_gen, 0, 0, 1);
if (wret)
ret = wret;
} else {
@ -788,6 +827,7 @@ static int push_nodes_for_insert(struct btrfs_trans_handle *trans,
return 1;
mid = path->nodes[level];
WARN_ON(btrfs_header_generation(mid) != trans->transid);
orig_ptr = btrfs_node_blockptr(mid, orig_slot);
if (level < BTRFS_MAX_LEVEL - 1)
@ -1113,6 +1153,8 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root
src_nritems = btrfs_header_nritems(src);
dst_nritems = btrfs_header_nritems(dst);
push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
WARN_ON(btrfs_header_generation(src) != trans->transid);
WARN_ON(btrfs_header_generation(dst) != trans->transid);
if (push_items <= 0) {
return 1;
@ -1159,6 +1201,9 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
int dst_nritems;
int ret = 0;
WARN_ON(btrfs_header_generation(src) != trans->transid);
WARN_ON(btrfs_header_generation(dst) != trans->transid);
src_nritems = btrfs_header_nritems(src);
dst_nritems = btrfs_header_nritems(dst);
push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
@ -1202,6 +1247,8 @@ static int insert_new_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int level)
{
u64 root_gen;
u64 lower_gen;
struct extent_buffer *lower;
struct extent_buffer *c;
struct btrfs_disk_key lower_key;
@ -1209,7 +1256,20 @@ static int insert_new_root(struct btrfs_trans_handle *trans,
BUG_ON(path->nodes[level]);
BUG_ON(path->nodes[level-1] != root->node);
c = btrfs_alloc_free_block(trans, root, root->nodesize,
if (root->ref_cows)
root_gen = trans->transid;
else
root_gen = 0;
lower = path->nodes[level-1];
if (level == 1)
btrfs_item_key(lower, &lower_key, 0);
else
btrfs_node_key(lower, &lower_key, 0);
c = __btrfs_alloc_free_block(trans, root, root->nodesize,
root->root_key.objectid,
root_gen, lower_key.objectid, level,
root->node->start, 0);
if (IS_ERR(c))
return PTR_ERR(c);
@ -1219,19 +1279,16 @@ static int insert_new_root(struct btrfs_trans_handle *trans,
btrfs_set_header_bytenr(c, c->start);
btrfs_set_header_generation(c, trans->transid);
btrfs_set_header_owner(c, root->root_key.objectid);
lower = path->nodes[level-1];
write_extent_buffer(c, root->fs_info->fsid,
(unsigned long)btrfs_header_fsid(c),
BTRFS_FSID_SIZE);
if (level == 1)
btrfs_item_key(lower, &lower_key, 0);
else
btrfs_node_key(lower, &lower_key, 0);
btrfs_set_node_key(c, &lower_key, 0);
btrfs_set_node_blockptr(c, 0, lower->start);
WARN_ON(btrfs_header_generation(lower) == 0);
btrfs_set_node_ptr_generation(c, 0, btrfs_header_generation(lower));
lower_gen = btrfs_header_generation(lower);
WARN_ON(lower_gen == 0);
btrfs_set_node_ptr_generation(c, 0, lower_gen);
btrfs_mark_buffer_dirty(c);
@ -1241,6 +1298,18 @@ static int insert_new_root(struct btrfs_trans_handle *trans,
extent_buffer_get(c);
path->nodes[level] = c;
path->slots[level] = 0;
if (root->ref_cows && lower_gen != trans->transid) {
struct btrfs_path *back_path = btrfs_alloc_path();
int ret;
ret = btrfs_insert_extent_backref(trans,
root->fs_info->extent_root,
path, lower->start,
root->root_key.objectid,
trans->transid, 0, 0);
BUG_ON(ret);
btrfs_free_path(back_path);
}
return 0;
}
@ -1294,6 +1363,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level)
{
u64 root_gen;
struct extent_buffer *c;
struct extent_buffer *split;
struct btrfs_disk_key disk_key;
@ -1303,6 +1373,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
u32 c_nritems;
c = path->nodes[level];
WARN_ON(btrfs_header_generation(c) != trans->transid);
if (c == root->node) {
/* trying to split the root, lets make a new one */
ret = insert_new_root(trans, root, path, level + 1);
@ -1319,8 +1390,17 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
}
c_nritems = btrfs_header_nritems(c);
split = btrfs_alloc_free_block(trans, root, root->nodesize,
c->start, 0);
if (root->ref_cows)
root_gen = trans->transid;
else
root_gen = 0;
btrfs_node_key(c, &disk_key, 0);
split = __btrfs_alloc_free_block(trans, root, root->nodesize,
root->root_key.objectid,
root_gen,
btrfs_disk_key_objectid(&disk_key),
level, c->start, 0);
if (IS_ERR(split))
return PTR_ERR(split);
@ -1789,6 +1869,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *ins_key,
struct btrfs_path *path, int data_size, int extend)
{
u64 root_gen;
struct extent_buffer *l;
u32 nritems;
int mid;
@ -1807,6 +1888,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
if (extend)
space_needed = data_size;
if (root->ref_cows)
root_gen = trans->transid;
else
root_gen = 0;
/* first try to make some room by pushing left and right */
if (ins_key->type != BTRFS_DIR_ITEM_KEY) {
wret = push_leaf_right(trans, root, path, data_size, 0);
@ -1837,8 +1923,12 @@ again:
nritems = btrfs_header_nritems(l);
mid = (nritems + 1)/ 2;
right = btrfs_alloc_free_block(trans, root, root->leafsize,
l->start, 0);
btrfs_item_key(l, &disk_key, 0);
right = __btrfs_alloc_free_block(trans, root, root->leafsize,
root->root_key.objectid,
root_gen, disk_key.objectid, 0,
l->start, 0);
if (IS_ERR(right))
return PTR_ERR(right);
@ -2413,13 +2503,16 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (leaf == root->node) {
btrfs_set_header_level(leaf, 0);
} else {
u64 root_gen = btrfs_header_generation(path->nodes[1]);
clean_tree_block(trans, root, leaf);
wait_on_tree_block_writeback(root, leaf);
wret = del_ptr(trans, root, path, 1, path->slots[1]);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root,
leaf->start, leaf->len, 1);
leaf->start, leaf->len,
btrfs_header_owner(path->nodes[1]),
root_gen, 0, 0, 1);
if (wret)
ret = wret;
}
@ -2456,9 +2549,13 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
}
if (btrfs_header_nritems(leaf) == 0) {
u64 root_gen;
u64 bytenr = leaf->start;
u32 blocksize = leaf->len;
root_gen = btrfs_header_generation(
path->nodes[1]);
clean_tree_block(trans, root, leaf);
wait_on_tree_block_writeback(root, leaf);
@ -2468,7 +2565,9 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
free_extent_buffer(leaf);
wret = btrfs_free_extent(trans, root, bytenr,
blocksize, 1);
blocksize,
btrfs_header_owner(path->nodes[1]),
root_gen, 0, 0, 1);
if (wret)
ret = wret;
} else {
@ -2482,6 +2581,61 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
return ret;
}
/*
* walk up the tree as far as required to find the previous leaf.
* returns 0 if it found something or 1 if there are no lesser leaves.
* returns < 0 on io errors.
*/
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
int slot;
int level = 1;
u64 bytenr;
struct extent_buffer *c;
struct extent_buffer *next = NULL;
while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
return 1;
slot = path->slots[level];
c = path->nodes[level];
if (slot == 0) {
level++;
if (level == BTRFS_MAX_LEVEL)
return 1;
continue;
}
slot--;
bytenr = btrfs_node_blockptr(c, slot);
if (next)
free_extent_buffer(next);
if (path->reada < 0)
reada_for_search(root, path, level, slot);
next = read_tree_block(root, bytenr,
btrfs_level_size(root, level - 1));
break;
}
path->slots[level] = slot;
while(1) {
level--;
c = path->nodes[level];
free_extent_buffer(c);
path->nodes[level] = next;
path->slots[level] = 0;
if (!level)
break;
if (path->reada)
reada_for_search(root, path, level, 0);
next = read_tree_block(root, btrfs_node_blockptr(next, 0),
btrfs_level_size(root, level - 1));
}
return 0;
}
/*
* walk up the tree as far as required to find the next leaf.
* returns 0 if it found something or 1 if there are no greater leaves.
@ -2503,6 +2657,8 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
c = path->nodes[level];
if (slot >= btrfs_header_nritems(c)) {
level++;
if (level == BTRFS_MAX_LEVEL)
return 1;
continue;
}

41
fs/btrfs/ctree.h
View File

@ -544,11 +544,12 @@ BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
BTRFS_SETGET_STACK_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
BTRFS_SETGET_STACK_FUNCS(ref_generation, struct btrfs_extent_ref,
BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
generation, 64);
BTRFS_SETGET_STACK_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
BTRFS_SETGET_STACK_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
objectid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
refs, 32);
@ -914,24 +915,45 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
*hint, u64 search_start,
int data, int owner);
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct btrfs_root *root, u64 owner_objectid);
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u32 size,
u64 root_objectid,
u64 hint, u64 empty_size);
struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize,
u64 root_objectid,
u64 ref_generation,
u64 first_objectid,
int level,
u64 hint,
u64 empty_size);
int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 bytenr,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset);
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 owner,
u64 num_bytes, u64 empty_size, u64 search_start,
struct btrfs_root *root,
u64 num_bytes, u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset,
u64 empty_size, u64 hint_byte,
u64 search_end, struct btrfs_key *ins, int data);
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf);
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 bytenr, u64 num_bytes, int pin);
*root, u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid, u64 owner_offset, int pin);
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_map_tree *unpin);
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes);
u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset);
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
@ -966,6 +988,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, struct btrfs_key
*cpu_key, u32 data_size);
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
*root);

2
fs/btrfs/disk-io.c
View File

@ -210,7 +210,7 @@ static int btree_writepages(struct address_space *mapping,
{
struct extent_map_tree *tree;
tree = &BTRFS_I(mapping->host)->extent_tree;
if (wbc->sync_mode == WB_SYNC_NONE) {
if (0 && wbc->sync_mode == WB_SYNC_NONE) {
u64 num_dirty;
u64 start = 0;
unsigned long thresh = 96 * 1024 * 1024;

373
fs/btrfs/extent-tree.c
View File

@ -17,6 +17,7 @@
*/
#include <linux/sched.h>
#include <linux/crc32c.h>
#include "hash.h"
#include "ctree.h"
#include "disk-io.h"
@ -89,7 +90,8 @@ static int cache_block_group(struct btrfs_root *root,
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid < block_group->key.objectid) {
if (key.objectid + key.offset > first_free)
if (btrfs_key_type(&key) != BTRFS_EXTENT_REF_KEY &&
key.objectid + key.offset > first_free)
first_free = key.objectid + key.offset;
goto next;
}
@ -353,7 +355,7 @@ found:
return found_group;
}
static u64 hash_extent_ref(u64 root_objectid, u64 root_generation,
static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset)
{
u32 high_crc = ~(u32)0;
@ -362,53 +364,149 @@ static u64 hash_extent_ref(u64 root_objectid, u64 root_generation,
lenum = cpu_to_le64(root_objectid);
high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(root_generation);
high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(ref_generation);
low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
#if 0
lenum = cpu_to_le64(owner);
low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(owner_offset);
low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
#endif
return ((u64)high_crc << 32) | (u64)low_crc;
}
int insert_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr,
u64 root_objectid, u64 root_generation,
u64 owner, u64 owner_offset)
static int match_extent_ref(struct extent_buffer *leaf,
struct btrfs_extent_ref *disk_ref,
struct btrfs_extent_ref *cpu_ref)
{
int ret;
int len;
if (cpu_ref->objectid)
len = sizeof(*cpu_ref);
else
len = 2 * sizeof(u64);
ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
len);
return ret == 0;
}
static int lookup_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 bytenr,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset, int del)
{
u64 hash;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_extent_ref ref;
struct extent_buffer *leaf;
struct btrfs_extent_ref *disk_ref;
int ret;
int ret2;
btrfs_set_stack_ref_root(&ref, root_objectid);
btrfs_set_stack_ref_generation(&ref, ref_generation);
btrfs_set_stack_ref_objectid(&ref, owner);
btrfs_set_stack_ref_offset(&ref, owner_offset);
hash = hash_extent_ref(root_objectid, ref_generation, owner,
owner_offset);
key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
while (1) {
ret = btrfs_search_slot(trans, root, &key, path,
del ? -1 : 0, del);
if (ret < 0)
goto out;
leaf = path->nodes[0];
if (ret != 0) {
u32 nritems = btrfs_header_nritems(leaf);
if (path->slots[0] >= nritems) {
ret2 = btrfs_next_leaf(root, path);
if (ret2)
goto out;
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != bytenr ||
found_key.type != BTRFS_EXTENT_REF_KEY)
goto out;
key.offset = found_key.offset;
if (del) {
btrfs_release_path(root, path);
continue;
}
}
disk_ref = btrfs_item_ptr(path->nodes[0],
path->slots[0],
struct btrfs_extent_ref);
if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
ret = 0;
goto out;
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
key.offset = found_key.offset + 1;
btrfs_release_path(root, path);
}
out:
return ret;
}
int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 bytenr,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset)
{
u64 hash;
struct btrfs_key key;
struct btrfs_extent_ref ref;
struct extent_buffer *l;
struct btrfs_extent_item *item;
struct btrfs_extent_ref *disk_ref;
int ret;
btrfs_set_stack_ref_root(&ref, root_objectid);
btrfs_set_stack_ref_generation(&ref, root_generation);
btrfs_set_stack_ref_generation(&ref, ref_generation);
btrfs_set_stack_ref_objectid(&ref, owner);
btrfs_set_stack_ref_offset(&ref, owner_offset);
ret = btrfs_name_hash(&ref, sizeof(ref), &hash);
hash = hash_extent_ref(root_objectid, ref_generation, owner,
owner_offset);
key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
while (ret == -EEXIST) {
disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_ref);
if (match_extent_ref(path->nodes[0], disk_ref, &ref))
goto out;
key.offset++;
btrfs_release_path(root, path);
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(ref));
}
if (ret)
goto out;
disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_ref);
write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
sizeof(ref));
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
return ret;
}
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 root_generation,
u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset)
{
struct btrfs_path *path;
@ -441,6 +539,11 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
path, bytenr, root_objectid,
ref_generation, owner, owner_offset);
BUG_ON(ret);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
@ -489,10 +592,29 @@ out:
}
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
struct btrfs_root *root, u64 owner_objectid)
{
u64 generation;
u64 key_objectid;
u64 level;
u32 nritems;
struct btrfs_disk_key disk_key;
level = btrfs_header_level(root->node);
generation = trans->transid;
nritems = btrfs_header_nritems(root->node);
if (nritems > 0) {
if (level == 0)
btrfs_item_key(root->node, &disk_key, 0);
else
btrfs_node_key(root->node, &disk_key, 0);
key_objectid = btrfs_disk_key_objectid(&disk_key);
} else {
key_objectid = 0;
}
return btrfs_inc_extent_ref(trans, root, root->node->start,
root->node->len);
root->node->len, owner_objectid,
generation, 0, 0);
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
@ -506,7 +628,6 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int level;
int ret;
int faili;
int err;
if (!root->ref_cows)
return 0;
@ -528,7 +649,9 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (disk_bytenr == 0)
continue;
ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(buf, fi));
btrfs_file_extent_disk_num_bytes(buf, fi),
root->root_key.objectid, trans->transid,
key.objectid, key.offset);
if (ret) {
faili = i;
goto fail;
@ -536,7 +659,9 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
} else {
bytenr = btrfs_node_blockptr(buf, i);
ret = btrfs_inc_extent_ref(trans, root, bytenr,
btrfs_level_size(root, level - 1));
btrfs_level_size(root, level - 1),
root->root_key.objectid,
trans->transid, 0, 0);
if (ret) {
faili = i;
goto fail;
@ -546,6 +671,7 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
return 0;
fail:
WARN_ON(1);
#if 0
for (i =0; i < faili; i++) {
if (level == 0) {
u64 disk_bytenr;
@ -571,6 +697,7 @@ fail:
BUG_ON(err);
}
}
#endif
return ret;
}
@ -809,18 +936,18 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root)
{
u64 start;
u64 end;
struct btrfs_fs_info *info = extent_root->fs_info;
struct btrfs_path *path;
struct btrfs_key ins;
struct btrfs_extent_item extent_item;
int ret;
int err = 0;
u64 start;
u64 end;
struct btrfs_fs_info *info = extent_root->fs_info;
btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
btrfs_set_stack_extent_owner(&extent_item,
extent_root->root_key.objectid);
path = btrfs_alloc_path();
while(1) {
ret = find_first_extent_bit(&info->extent_ins, 0, &start,
@ -834,7 +961,12 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
&extent_item, sizeof(extent_item));
clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
GFP_NOFS);
err = btrfs_insert_extent_backref(trans, extent_root, path,
start, extent_root->root_key.objectid,
0, 0, 0);
BUG_ON(err);
}
btrfs_free_path(path);
return 0;
}
@ -871,7 +1003,9 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
* remove an extent from the root, returns 0 on success
*/
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 bytenr, u64 num_bytes, int pin,
*root, u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid, u64 owner_offset, int pin,
int mark_free)
{
struct btrfs_path *path;
@ -891,6 +1025,24 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
if (!path)
return -ENOMEM;
if (ref_generation && owner_objectid == 0 && root_objectid == 3) {
//printk("drop backref root %Lu gen %Lu byte %Lu\n", root_objectid, ref_generation, bytenr );
}
ret = lookup_extent_backref(trans, extent_root, path,
bytenr, root_objectid,
ref_generation,
owner_objectid, owner_offset, 1);
if (ret == 0) {
ret = btrfs_del_item(trans, extent_root, path);
} else {
btrfs_print_leaf(extent_root, path->nodes[0]);
WARN_ON(1);
printk("Unable to find ref byte nr %Lu root %Lu "
" gen %Lu owner %Lu offset %Lu\n", bytenr,
root_objectid, ref_generation, owner_objectid,
owner_offset);
}
btrfs_release_path(extent_root, path);
ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
if (ret < 0)
return ret;
@ -965,7 +1117,9 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
GFP_NOFS);
ret = __free_extent(trans, extent_root,
start, end + 1 - start, 0, 0);
start, end + 1 - start,
extent_root->root_key.objectid,
0, 0, 0, 0, 0);
if (ret)
err = ret;
}
@ -976,18 +1130,25 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
* remove an extent from the root, returns 0 on success
*/
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 bytenr, u64 num_bytes, int pin)
*root, u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid, u64 owner_offset, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
int pending_ret;
int ret;
WARN_ON(num_bytes < root->sectorsize);
if (!root->ref_cows)
ref_generation = 0;
if (root == extent_root) {
pin_down_bytes(root, bytenr, num_bytes, 1);
return 0;
}
ret = __free_extent(trans, root, bytenr, num_bytes, pin, pin == 0);
ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
ref_generation, owner_objectid, owner_offset,
pin, pin == 0);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
@ -1080,23 +1241,26 @@ check_failed:
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
/*
* a rare case, go back one key if we hit a block group item
* instead of an extent item
* walk backwards to find the first extent item key
*/
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY &&
key.objectid + key.offset >= search_start) {
ins->objectid = key.objectid;
ins->offset = key.offset - 1;
btrfs_release_path(root, path);
ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
if (ret < 0)
goto error;
if (path->slots[0] > 0) {
while(btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
if (path->slots[0] == 0) {
ret = btrfs_prev_leaf(root, path);
if (ret != 0) {
ret = btrfs_search_slot(trans, root, ins,
path, 0, 0);
if (ret < 0)
goto error;
if (path->slots[0] > 0)
path->slots[0]--;
break;
}
} else {
path->slots[0]--;
}
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
}
while (1) {
l = path->nodes[0];
slot = path->slots[0];
@ -1146,7 +1310,8 @@ check_failed:
}
}
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
if (!start_found) {
if (!start_found && btrfs_key_type(&key) ==
BTRFS_BLOCK_GROUP_ITEM_KEY) {
last_byte = key.objectid;
start_found = 1;
}
@ -1244,8 +1409,10 @@ error:
* returns 0 if everything worked, non-zero otherwise.
*/
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 owner,
u64 num_bytes, u64 empty_size, u64 hint_byte,
struct btrfs_root *root,
u64 num_bytes, u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset,
u64 empty_size, u64 hint_byte,
u64 search_end, struct btrfs_key *ins, int data)
{
int ret;
@ -1255,9 +1422,9 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
struct btrfs_path *path;
btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_stack_extent_owner(&extent_item, owner);
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(trans, root, num_bytes, empty_size,
@ -1296,8 +1463,16 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
trans->alloc_exclude_start = 0;
trans->alloc_exclude_nr = 0;
BUG_ON(ret);
path = btrfs_alloc_path();
BUG_ON(!path);
ret = btrfs_insert_extent_backref(trans, extent_root, path,
ins->objectid, root_objectid,
ref_generation, owner, owner_offset);
BUG_ON(ret);
btrfs_free_path(path);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
@ -1321,15 +1496,43 @@ update_block:
*/
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize, u64 hint,
u32 blocksize,
u64 root_objectid, u64 hint,
u64 empty_size)
{
u64 ref_generation;
if (root->ref_cows)
ref_generation = trans->transid;
else
ref_generation = 0;
return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
ref_generation, 0, 0, hint, empty_size);
}
/*
* helper function to allocate a block for a given tree
* returns the tree buffer or NULL.
*/
struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize,
u64 root_objectid,
u64 ref_generation,
u64 first_objectid,
int level,
u64 hint,
u64 empty_size)
{
struct btrfs_key ins;
int ret;
struct extent_buffer *buf;
ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
blocksize, empty_size, hint,
ret = btrfs_alloc_extent(trans, root, blocksize,
root_objectid, ref_generation,
first_objectid, level, empty_size, hint,
(u64)-1, &ins, 0);
if (ret) {
BUG_ON(ret > 0);
@ -1337,7 +1540,9 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
}
buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
if (!buf) {
btrfs_free_extent(trans, root, ins.objectid, blocksize, 0);
btrfs_free_extent(trans, root, ins.objectid, blocksize,
root->root_key.objectid, ref_generation,
0, 0, 0);
return ERR_PTR(-ENOMEM);
}
btrfs_set_buffer_uptodate(buf);
@ -1355,6 +1560,8 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
static int drop_leaf_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *leaf)
{
u64 leaf_owner;
u64 leaf_generation;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
@ -1363,6 +1570,9 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
BUG_ON(!btrfs_is_leaf(leaf));
nritems = btrfs_header_nritems(leaf);
leaf_owner = btrfs_header_owner(leaf);
leaf_generation = btrfs_header_generation(leaf);
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
@ -1381,7 +1591,9 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
if (disk_bytenr == 0)
continue;
ret = btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi), 0);
btrfs_file_extent_disk_num_bytes(leaf, fi),
leaf_owner, leaf_generation,
key.objectid, key.offset, 0);
BUG_ON(ret);
}
return 0;
@ -1423,9 +1635,12 @@ static void reada_walk_down(struct btrfs_root *root,
static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
u64 root_owner;
u64 root_gen;
u64 bytenr;
struct extent_buffer *next;
struct extent_buffer *cur;
u64 bytenr;
struct extent_buffer *parent;
u32 blocksize;
int ret;
u32 refs;
@ -1466,9 +1681,13 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
parent = path->nodes[*level];
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
ret = btrfs_free_extent(trans, root, bytenr,
blocksize, 1);
blocksize, root_owner,
root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
@ -1484,10 +1703,16 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
parent = path->nodes[*level];
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
free_extent_buffer(next);
ret = btrfs_free_extent(trans, root,
bytenr, blocksize, 1);
ret = btrfs_free_extent(trans, root, bytenr,
blocksize,
root_owner,
root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
@ -1502,8 +1727,19 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
out:
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
if (path->nodes[*level] == root->node) {
root_owner = root->root_key.objectid;
parent = path->nodes[*level];
} else {
parent = path->nodes[*level + 1];
root_owner = btrfs_header_owner(parent);
}
root_gen = btrfs_header_generation(parent);
ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
path->nodes[*level]->len, 1);
path->nodes[*level]->len,
root_owner, root_gen, 0, 0, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
@ -1519,10 +1755,12 @@ out:
static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
u64 root_owner;
u64 root_gen;
struct btrfs_root_item *root_item = &root->root_item;
int i;
int slot;
int ret;
struct btrfs_root_item *root_item = &root->root_item;
for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
slot = path->slots[i];
@ -1539,9 +1777,20 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
root_item->drop_level = i;
return 0;
} else {
if (path->nodes[*level] == root->node) {
root_owner = root->root_key.objectid;
root_gen =
btrfs_header_generation(path->nodes[*level]);
} else {
struct extent_buffer *node;
node = path->nodes[*level + 1];
root_owner = btrfs_header_owner(node);
root_gen = btrfs_header_generation(node);
}
ret = btrfs_free_extent(trans, root,
path->nodes[*level]->start,
path->nodes[*level]->len, 1);
path->nodes[*level]->len,
root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;

20
fs/btrfs/file.c
View File

@ -496,7 +496,10 @@ next_slot:
sizeof(old));
if (disk_bytenr != 0) {
ret = btrfs_inc_extent_ref(trans, root,
disk_bytenr, disk_num_bytes);
disk_bytenr, disk_num_bytes,
root->root_key.objectid,
trans->transid,
key.objectid, end);
BUG_ON(ret);
}
}
@ -541,6 +544,14 @@ next_slot:
u64 disk_bytenr = 0;
u64 disk_num_bytes = 0;
u64 extent_num_bytes = 0;
u64 root_gen;
if (leaf != root->node) {
root_gen =
btrfs_header_generation(path->nodes[1]);
} else {
root_gen = btrfs_header_generation(leaf);
}
if (found_extent) {
disk_bytenr =
btrfs_file_extent_disk_bytenr(leaf,
@ -562,8 +573,11 @@ next_slot:
if (found_extent && disk_bytenr != 0) {
inode->i_blocks -= extent_num_bytes >> 9;
ret = btrfs_free_extent(trans, root,
disk_bytenr,
disk_num_bytes, 0);
disk_bytenr,
disk_num_bytes,
root->root_key.objectid,
root_gen, inode->i_ino,
key.offset, 0);
}
BUG_ON(ret);

38
fs/btrfs/inode.c
View File

@ -93,7 +93,9 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
if (alloc_hint == EXTENT_MAP_INLINE)
goto out;
ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0,
ret = btrfs_alloc_extent(trans, root, num_bytes,
root->root_key.objectid, trans->transid,
inode->i_ino, start, 0,
alloc_hint, (u64)-1, &ins, 1);
if (ret) {
WARN_ON(1);
@ -560,6 +562,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
u64 extent_start = 0;
u64 extent_num_bytes = 0;
u64 item_end = 0;
u64 root_gen = 0;
int found_extent;
int del_item;
int extent_type = -1;
@ -670,6 +673,15 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
found_extent = 1;
inode->i_blocks -= num_dec;
}
if (leaf == root->node) {
root_gen =
btrfs_header_generation(leaf);
} else {
struct extent_buffer *parent;
parent = path->nodes[1];
root_gen =
btrfs_header_generation(parent);
}
}
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
!del_item) {
@ -690,7 +702,10 @@ delete:
btrfs_release_path(root, path);
if (found_extent) {
ret = btrfs_free_extent(trans, root, extent_start,
extent_num_bytes, 0);
extent_num_bytes,
root->root_key.objectid,
root_gen, inode->i_ino,
found_key.offset, 0);
BUG_ON(ret);
}
}
@ -1900,7 +1915,14 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0);
ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
0, &objectid);
if (ret)
goto fail;
leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
objectid, trans->transid, 0, 0,
0, 0);
if (IS_ERR(leaf))
return PTR_ERR(leaf);
@ -1908,7 +1930,8 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
btrfs_set_header_level(leaf, 0);
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_owner(leaf, root->root_key.objectid);
btrfs_set_header_owner(leaf, objectid);
write_extent_buffer(leaf, root->fs_info->fsid,
(unsigned long)btrfs_header_fsid(leaf),
BTRFS_FSID_SIZE);
@ -1933,11 +1956,6 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
free_extent_buffer(leaf);
leaf = NULL;
ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
0, &objectid);
if (ret)
goto fail;
btrfs_set_root_dirid(&root_item, new_dirid);
key.objectid = objectid;
@ -2056,7 +2074,7 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
if (ret)
goto fail;
ret = btrfs_inc_root_ref(trans, root);
ret = btrfs_inc_root_ref(trans, root, objectid);
if (ret)
goto fail;
fail:

10
fs/btrfs/print-tree.c
View File

@ -33,6 +33,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
struct btrfs_file_extent_item *fi;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_extent_ref *ref;
u32 type;
printk("leaf %llu total ptrs %d free space %d\n",
@ -73,6 +74,15 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
printk("\t\textent data refs %u\n",
btrfs_extent_refs(l, ei));
break;
case BTRFS_EXTENT_REF_KEY:
ref = btrfs_item_ptr(l, i, struct btrfs_extent_ref);
printk("\t\textent back ref root %llu gen %llu "
"owner %llu offset %llu\n",
(unsigned long long)btrfs_ref_root(l, ref),
(unsigned long long)btrfs_ref_generation(l, ref),
(unsigned long long)btrfs_ref_objectid(l, ref),
(unsigned long long)btrfs_ref_offset(l, ref));
break;
case BTRFS_EXTENT_DATA_KEY:
fi = btrfs_item_ptr(l, i,

2
fs/btrfs/tree-defrag.c
View File

@ -78,6 +78,8 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
break;
if (*level == 1) {
WARN_ON(btrfs_header_generation(path->nodes[*level]) !=
trans->transid);
ret = btrfs_realloc_node(trans, root,
path->nodes[*level],
path->slots[*level],