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Btrfs: ctree: reduce args where only fs_info used

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This patch is part of a larger project to cleanup btrfs's internal usage
of struct btrfs_root. Many functions take btrfs_root only to grab a
pointer to fs_info.

This causes programmers to ponder which root can be passed. Since only
the fs_info is read affected functions can accept any root, except this
is only obvious upon inspection.

This patch reduces the specificty of such functions to accept the
fs_info directly.

This patch does not address the two functions in ctree.c (insert_ptr,
and split_item) which only use root for BUG_ONs in ctree.c

This patch affects the following functions:
  1) fixup_low_keys
  2) btrfs_set_item_key_safe

Signed-off-by: Daniel Dressler <danieru.dressler@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Daniel Dressler
2014-11-12 13:43:09 +09:00
committed by David Sterba
parent a742994aa2
commit b7a0365ec7
4 changed files with 22 additions and 18 deletions
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27
fs/btrfs/ctree.c
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@@ -3126,7 +3126,8 @@ again:
* higher levels
*
*/
static void fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
static void fixup_low_keys(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
struct btrfs_disk_key *key, int level)
{
int i;
@@ -3137,7 +3138,7 @@ static void fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
if (!path->nodes[i])
break;
t = path->nodes[i];
tree_mod_log_set_node_key(root->fs_info, t, tslot, 1);
tree_mod_log_set_node_key(fs_info, t, tslot, 1);
btrfs_set_node_key(t, key, tslot);
btrfs_mark_buffer_dirty(path->nodes[i]);
if (tslot != 0)
@@ -3151,7 +3152,8 @@ static void fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
* This function isn't completely safe. It's the caller's responsibility
* that the new key won't break the order
*/
void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
struct btrfs_key *new_key)
{
struct btrfs_disk_key disk_key;
@@ -3173,7 +3175,7 @@ void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
btrfs_set_item_key(eb, &disk_key, slot);
btrfs_mark_buffer_dirty(eb);
if (slot == 0)
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(fs_info, path, &disk_key, 1);
}
/*
@@ -3931,7 +3933,7 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
clean_tree_block(trans, root, right);
btrfs_item_key(right, &disk_key, 0);
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(root->fs_info, path, &disk_key, 1);
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
@@ -4168,6 +4170,7 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
int mid;
int slot;
struct extent_buffer *right;
struct btrfs_fs_info *fs_info = root->fs_info;
int ret = 0;
int wret;
int split;
@@ -4271,10 +4274,10 @@ again:
btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(right, root->root_key.objectid);
btrfs_set_header_level(right, 0);
write_extent_buffer(right, root->fs_info->fsid,
write_extent_buffer(right, fs_info->fsid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
write_extent_buffer(right, fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(right),
BTRFS_UUID_SIZE);
@@ -4297,7 +4300,7 @@ again:
path->nodes[0] = right;
path->slots[0] = 0;
if (path->slots[1] == 0)
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(fs_info, path, &disk_key, 1);
}
btrfs_mark_buffer_dirty(right);
return ret;
@@ -4615,7 +4618,7 @@ void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
btrfs_set_disk_key_offset(&disk_key, offset + size_diff);
btrfs_set_item_key(leaf, &disk_key, slot);
if (slot == 0)
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(root->fs_info, path, &disk_key, 1);
}
item = btrfs_item_nr(slot);
@@ -4716,7 +4719,7 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
if (path->slots[0] == 0) {
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(root->fs_info, path, &disk_key, 1);
}
btrfs_unlock_up_safe(path, 1);
@@ -4888,7 +4891,7 @@ static void del_ptr(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_disk_key disk_key;
btrfs_node_key(parent, &disk_key, 0);
fixup_low_keys(root, path, &disk_key, level + 1);
fixup_low_keys(root->fs_info, path, &disk_key, level + 1);
}
btrfs_mark_buffer_dirty(parent);
}
@@ -4990,7 +4993,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_disk_key disk_key;
btrfs_item_key(leaf, &disk_key, 0);
fixup_low_keys(root, path, &disk_key, 1);
fixup_low_keys(root->fs_info, path, &disk_key, 1);
}
/* delete the leaf if it is mostly empty */