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Pass down the expected generation number when reading tree blocks

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This commit is contained in:
Chris Mason 2008-05-12 13:51:24 -04:00 committed by David Woodhouse
parent d160150c8b
commit 9a9bdd6047
7 changed files with 52 additions and 50 deletions
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10
btrfsck.c
View File

@ -511,7 +511,10 @@ static int run_next_block(struct btrfs_root *root,
for(i = 0; i < ret; i++) {
insert_cache_extent(reada, bits[i].start,
bits[i].size);
readahead_tree_block(root, bits[i].start, bits[i].size);
/* fixme, get the parent transid */
readahead_tree_block(root, bits[i].start,
bits[i].size, 0);
}
}
*last = bits[0].start;
@ -534,7 +537,8 @@ static int run_next_block(struct btrfs_root *root,
free(cache);
}
buf = read_tree_block(root, bytenr, size);
/* fixme, get the real parent transid */
buf = read_tree_block(root, bytenr, size, 0);
nritems = btrfs_header_nritems(buf);
ret = check_block(root, extent_cache, buf);
if (ret) {
@ -790,7 +794,7 @@ int main(int ac, char **av) {
buf = read_tree_block(root->fs_info->tree_root,
btrfs_root_bytenr(&ri),
btrfs_level_size(root,
btrfs_root_level(&ri)));
btrfs_root_level(&ri)), 0);
add_root_to_pending(buf, bits, bits_nr, &extent_cache,
&pending, &seen, &reada, &nodes,
found_key.objectid);

54
ctree.c
View File

@ -301,6 +301,7 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
struct extent_buffer *cur;
struct extent_buffer *tmp;
u64 blocknr;
u64 gen;
u64 search_start = *last_ret;
u64 last_block = 0;
u64 other;
@ -353,6 +354,7 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
progress_passed = 1;
blocknr = btrfs_node_blockptr(parent, i);
gen = btrfs_node_ptr_generation(parent, i);
if (last_block == 0)
last_block = blocknr;
@ -386,9 +388,9 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
}
if (!cur) {
cur = read_tree_block(root, blocknr,
blocksize);
blocksize, gen);
} else if (!uptodate) {
btrfs_read_buffer(cur);
btrfs_read_buffer(cur, gen);
}
}
if (search_start == 0)
@ -651,12 +653,17 @@ static int bin_search(struct extent_buffer *eb, struct btrfs_key *key,
static struct extent_buffer *read_node_slot(struct btrfs_root *root,
struct extent_buffer *parent, int slot)
{
int level = btrfs_header_level(parent);
if (slot < 0)
return NULL;
if (slot >= btrfs_header_nritems(parent))
return NULL;
BUG_ON(level == 0);
return read_tree_block(root, btrfs_node_blockptr(parent, slot),
btrfs_level_size(root, btrfs_header_level(parent) - 1));
btrfs_level_size(root, level - 1),
btrfs_node_ptr_generation(parent, slot));
}
static int balance_level(struct btrfs_trans_handle *trans,
@ -1034,7 +1041,8 @@ static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
if ((search >= lowest_read && search <= highest_read) ||
(search < lowest_read && lowest_read - search <= 32768) ||
(search > highest_read && search - highest_read <= 32768)) {
readahead_tree_block(root, search, blocksize);
readahead_tree_block(root, search, blocksize,
btrfs_node_ptr_generation(node, nr));
nread += blocksize;
}
nscan++;
@ -1068,8 +1076,6 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
ins_len, int cow)
{
struct extent_buffer *b;
u64 bytenr;
u64 ptr_gen;
int slot;
int ret;
int level;
@ -1135,20 +1141,12 @@ again:
/* this is only true while dropping a snapshot */
if (level == lowest_level)
break;
bytenr = btrfs_node_blockptr(b, slot);
ptr_gen = btrfs_node_ptr_generation(b, slot);
if (should_reada)
reada_for_search(root, p, level, slot,
key->objectid);
b = read_tree_block(root, bytenr,
btrfs_level_size(root, level - 1));
if (ptr_gen != btrfs_header_generation(b)) {
printk("block %llu bad gen wanted %llu "
"found %llu\n",
(unsigned long long)b->start,
(unsigned long long)ptr_gen,
(unsigned long long)btrfs_header_generation(b));
}
b = read_node_slot(root, b, slot);
} else {
p->slots[level] = slot;
if (ins_len > 0 && btrfs_leaf_free_space(root, b) <
@ -1611,8 +1609,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
if (slot >= btrfs_header_nritems(upper) - 1)
return 1;
right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1),
root->leafsize);
right = read_node_slot(root, upper, slot + 1);
free_space = btrfs_leaf_free_space(root, right);
if (free_space < data_size + sizeof(struct btrfs_item)) {
free_extent_buffer(right);
@ -1764,8 +1761,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
return 1;
}
left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1],
slot - 1), root->leafsize);
left = read_node_slot(root, path->nodes[1], slot - 1);
free_space = btrfs_leaf_free_space(root, left);
if (free_space < data_size + sizeof(struct btrfs_item)) {
free_extent_buffer(left);
@ -2576,7 +2572,6 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
*/
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
u64 bytenr;
int slot;
int level = 1;
struct extent_buffer *c;
@ -2596,12 +2591,10 @@ int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
}
slot--;
bytenr = btrfs_node_blockptr(c, slot);
if (next)
free_extent_buffer(next);
next = read_tree_block(root, bytenr,
btrfs_level_size(root, level - 1));
next = read_node_slot(root, c, slot);
break;
}
path->slots[level] = slot;
@ -2616,8 +2609,7 @@ int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
path->slots[level] = slot;
if (!level)
break;
next = read_tree_block(root, btrfs_node_blockptr(next, slot),
btrfs_level_size(root, level - 1));
next = read_node_slot(root, next, slot);
}
return 0;
}
@ -2631,7 +2623,6 @@ int btrfs_next_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;
@ -2648,15 +2639,13 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
continue;
}
bytenr = btrfs_node_blockptr(c, slot);
if (next)
free_extent_buffer(next);
if (path->reada)
reada_for_search(root, path, level, slot, 0);
next = read_tree_block(root, bytenr,
btrfs_level_size(root, level -1));
next = read_node_slot(root, c, slot);
break;
}
path->slots[level] = slot;
@ -2670,8 +2659,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
break;
if (path->reada)
reada_for_search(root, path, level, 0, 0);
next = read_tree_block(root, btrfs_node_blockptr(next, 0),
btrfs_level_size(root, level - 1));
next = read_node_slot(root, next, 0);
}
return 0;
}

5
debug-tree.c
View File

@ -86,7 +86,8 @@ static void print_extents(struct btrfs_root *root, struct extent_buffer *eb)
for (i = 0; i < nr; i++) {
struct extent_buffer *next = read_tree_block(root,
btrfs_node_blockptr(eb, i),
size);
size,
btrfs_node_ptr_generation(eb, i));
if (btrfs_is_leaf(next) &&
btrfs_header_level(eb) != 1)
BUG();
@ -171,7 +172,7 @@ int main(int ac, char **av)
read_extent_buffer(leaf, &ri, offset, sizeof(ri));
buf = read_tree_block(root->fs_info->tree_root,
btrfs_root_bytenr(&ri),
root->leafsize);
root->leafsize, 0);
switch(found_key.objectid) {
case BTRFS_ROOT_TREE_OBJECTID:
if (!skip)

13
disk-io.c
View File

@ -95,7 +95,8 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
blocksize);
}
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
u64 parent_transid)
{
int ret;
int dev_nr;
@ -124,7 +125,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
}
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize)
u32 blocksize, u64 parent_transid)
{
int ret;
int dev_nr;
@ -380,7 +381,7 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize);
blocksize, 0);
BUG_ON(!root->node);
return 0;
}
@ -447,7 +448,7 @@ out:
}
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize);
blocksize, 0);
BUG_ON(!root->node);
insert:
root->ref_cows = 1;
@ -585,7 +586,7 @@ struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
chunk_root->node = read_tree_block(chunk_root,
btrfs_super_chunk_root(disk_super),
blocksize);
blocksize, 0);
BUG_ON(!chunk_root->node);
@ -601,7 +602,7 @@ struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
blocksize);
blocksize, 0);
BUG_ON(!tree_root->node);
ret = find_and_setup_root(tree_root, fs_info,
BTRFS_EXTENT_TREE_OBJECTID, extent_root);

6
disk-io.h
View File

@ -25,8 +25,9 @@
struct btrfs_device;
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize);
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize);
u32 blocksize, u64 parent_transid);
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
u64 parent_transid);
struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize);
int clean_tree_block(struct btrfs_trans_handle *trans,
@ -57,4 +58,5 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
int btrfs_open_device(struct btrfs_device *dev);
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify);
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
#endif

11
extent-tree.c
View File

@ -1225,7 +1225,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
&extent_item, sizeof(extent_item));
clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
GFP_NOFS);
eb = read_tree_block(extent_root, ins.objectid, ins.offset);
eb = read_tree_block(extent_root, ins.objectid, ins.offset,
trans->transid);
level = btrfs_header_level(eb);
if (level == 0) {
btrfs_item_key(eb, &first, 0);
@ -1892,7 +1893,8 @@ static void noinline reada_walk_down(struct btrfs_root *root,
}
}
mutex_unlock(&root->fs_info->fs_mutex);
ret = readahead_tree_block(root, bytenr, blocksize);
ret = readahead_tree_block(root, bytenr, blocksize,
btrfs_node_ptr_generation(node, i));
last = bytenr + blocksize;
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
@ -1912,6 +1914,7 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
u64 root_owner;
u64 root_gen;
u64 bytenr;
u64 ptr_gen;
struct extent_buffer *next;
struct extent_buffer *cur;
struct extent_buffer *parent;
@ -1948,6 +1951,7 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
break;
}
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
blocksize = btrfs_level_size(root, *level - 1);
ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
BUG_ON(ret);
@ -1967,7 +1971,8 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
free_extent_buffer(next);
reada_walk_down(root, cur, path->slots[*level]);
mutex_unlock(&root->fs_info->fs_mutex);
next = read_tree_block(root, bytenr, blocksize);
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
mutex_lock(&root->fs_info->fs_mutex);
/* we dropped the lock, check one more time */

3
print-tree.c
View File

@ -314,7 +314,8 @@ void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *eb)
for (i = 0; i < nr; i++) {
struct extent_buffer *next = read_tree_block(root,
btrfs_node_blockptr(eb, i),
size);
size,
btrfs_node_ptr_generation(eb, i));
if (btrfs_is_leaf(next) &&
btrfs_header_level(eb) != 1)
BUG();