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btrfs: tree-log: factor out a clean_log_buffer helper 

The tree-log code has three almost identical copies for the accounting on
an extent_buffer that doesn't need to be written any more.  The only
difference is that walk_down_log_tree passed the bytenr used to find the
buffer instead of extent_buffer.start and calculates the length using the
nodesize, while the other two callers look at the extent_buffer.len
field that must always be equivalent to the nodesize.

Factor the code into a common helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-04-03 16:03:55 +02:00 committed by David Sterba
parent 2c275afeb6
commit e6b430f817
1 changed files with 31 additions and 61 deletions
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92
fs/btrfs/tree-log.c
View File

@ -2563,6 +2563,28 @@ static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start)
btrfs_put_block_group(cache);
}
static int clean_log_buffer(struct btrfs_trans_handle *trans,
struct extent_buffer *eb)
{
int ret;
btrfs_tree_lock(eb);
btrfs_clear_buffer_dirty(trans, eb);
wait_on_extent_buffer_writeback(eb);
btrfs_tree_unlock(eb);
if (trans) {
ret = btrfs_pin_reserved_extent(trans, eb->start, eb->len);
if (ret)
return ret;
btrfs_redirty_list_add(trans->transaction, eb);
} else {
unaccount_log_buffer(eb->fs_info, eb->start);
}
return 0;
}
static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int *level,
@ -2573,7 +2595,6 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
u64 ptr_gen;
struct extent_buffer *next;
struct extent_buffer *cur;
u32 blocksize;
int ret = 0;
while (*level > 0) {
@ -2593,7 +2614,6 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
check.level = *level - 1;
check.has_first_key = true;
btrfs_node_key_to_cpu(cur, &check.first_key, path->slots[*level]);
blocksize = fs_info->nodesize;
next = btrfs_find_create_tree_block(fs_info, bytenr,
btrfs_header_owner(cur),
@ -2617,22 +2637,10 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
return ret;
}
btrfs_tree_lock(next);
btrfs_clear_buffer_dirty(trans, next);
wait_on_extent_buffer_writeback(next);
btrfs_tree_unlock(next);
if (trans) {
ret = btrfs_pin_reserved_extent(trans,
bytenr, blocksize);
if (ret) {
free_extent_buffer(next);
return ret;
}
btrfs_redirty_list_add(
trans->transaction, next);
} else {
unaccount_log_buffer(fs_info, bytenr);
ret = clean_log_buffer(trans, next);
if (ret) {
free_extent_buffer(next);
return ret;
}
}
free_extent_buffer(next);
@ -2662,7 +2670,6 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_path *path, int *level,
struct walk_control *wc)
{
struct btrfs_fs_info *fs_info = root->fs_info;
int i;
int slot;
int ret;
@ -2682,27 +2689,9 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans,
return ret;
if (wc->free) {
struct extent_buffer *next;
next = path->nodes[*level];
btrfs_tree_lock(next);
btrfs_clear_buffer_dirty(trans, next);
wait_on_extent_buffer_writeback(next);
btrfs_tree_unlock(next);
if (trans) {
ret = btrfs_pin_reserved_extent(trans,
path->nodes[*level]->start,
path->nodes[*level]->len);
if (ret)
return ret;
btrfs_redirty_list_add(trans->transaction,
next);
} else {
unaccount_log_buffer(fs_info,
path->nodes[*level]->start);
}
ret = clean_log_buffer(trans, path->nodes[*level]);
if (ret)
return ret;
}
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
@ -2720,7 +2709,6 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans,
static int walk_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *log, struct walk_control *wc)
{
struct btrfs_fs_info *fs_info = log->fs_info;
int ret = 0;
int wret;
int level;
@ -2762,26 +2750,8 @@ static int walk_log_tree(struct btrfs_trans_handle *trans,
orig_level);
if (ret)
goto out;
if (wc->free) {
struct extent_buffer *next;
next = path->nodes[orig_level];
btrfs_tree_lock(next);
btrfs_clear_buffer_dirty(trans, next);
wait_on_extent_buffer_writeback(next);
btrfs_tree_unlock(next);
if (trans) {
ret = btrfs_pin_reserved_extent(trans,
next->start, next->len);
if (ret)
goto out;
btrfs_redirty_list_add(trans->transaction, next);
} else {
unaccount_log_buffer(fs_info, next->start);
}
}
if (wc->free)
ret = clean_log_buffer(trans, path->nodes[orig_level]);
}
out: