mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 22:54:05 +08:00
btrfs: remove old unused commented out code
Remove code which has been #if0-ed out for a very long time and does not seem to be related to current codebase anymore. Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
parent
f2a97a9dbd
commit
182608c829
@ -709,79 +709,3 @@ btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
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return btrfs_delayed_node_to_head(ref);
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return NULL;
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}
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/*
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* add a delayed ref to the tree. This does all of the accounting required
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* to make sure the delayed ref is eventually processed before this
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* transaction commits.
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*
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* The main point of this call is to add and remove a backreference in a single
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* shot, taking the lock only once, and only searching for the head node once.
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*
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* It is the same as doing a ref add and delete in two separate calls.
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*/
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#if 0
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int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
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u64 bytenr, u64 num_bytes, u64 orig_parent,
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u64 parent, u64 orig_ref_root, u64 ref_root,
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u64 orig_ref_generation, u64 ref_generation,
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u64 owner_objectid, int pin)
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{
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struct btrfs_delayed_ref *ref;
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struct btrfs_delayed_ref *old_ref;
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struct btrfs_delayed_ref_head *head_ref;
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struct btrfs_delayed_ref_root *delayed_refs;
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int ret;
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ref = kmalloc(sizeof(*ref), GFP_NOFS);
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if (!ref)
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return -ENOMEM;
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old_ref = kmalloc(sizeof(*old_ref), GFP_NOFS);
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if (!old_ref) {
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kfree(ref);
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return -ENOMEM;
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}
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/*
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* the parent = 0 case comes from cases where we don't actually
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* know the parent yet. It will get updated later via a add/drop
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* pair.
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*/
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if (parent == 0)
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parent = bytenr;
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if (orig_parent == 0)
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orig_parent = bytenr;
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head_ref = kmalloc(sizeof(*head_ref), GFP_NOFS);
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if (!head_ref) {
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kfree(ref);
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kfree(old_ref);
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return -ENOMEM;
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}
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delayed_refs = &trans->transaction->delayed_refs;
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spin_lock(&delayed_refs->lock);
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/*
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* insert both the head node and the new ref without dropping
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* the spin lock
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*/
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ret = __btrfs_add_delayed_ref(trans, &head_ref->node, bytenr, num_bytes,
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(u64)-1, 0, 0, 0,
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BTRFS_UPDATE_DELAYED_HEAD, 0);
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BUG_ON(ret);
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ret = __btrfs_add_delayed_ref(trans, &ref->node, bytenr, num_bytes,
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parent, ref_root, ref_generation,
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owner_objectid, BTRFS_ADD_DELAYED_REF, 0);
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BUG_ON(ret);
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ret = __btrfs_add_delayed_ref(trans, &old_ref->node, bytenr, num_bytes,
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orig_parent, orig_ref_root,
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orig_ref_generation, owner_objectid,
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BTRFS_DROP_DELAYED_REF, pin);
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BUG_ON(ret);
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spin_unlock(&delayed_refs->lock);
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return 0;
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}
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#endif
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@ -1348,35 +1348,6 @@ fail:
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return ERR_PTR(ret);
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}
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#if 0
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struct btrfs_root *root;
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int ret;
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root = btrfs_read_fs_root_no_name(fs_info, location);
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if (!root)
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return NULL;
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if (root->in_sysfs)
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return root;
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ret = btrfs_set_root_name(root, name, namelen);
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if (ret) {
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free_extent_buffer(root->node);
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kfree(root);
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return ERR_PTR(ret);
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}
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ret = btrfs_sysfs_add_root(root);
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if (ret) {
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free_extent_buffer(root->node);
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kfree(root->name);
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kfree(root);
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return ERR_PTR(ret);
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}
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root->in_sysfs = 1;
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return root;
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#endif
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static int btrfs_congested_fn(void *congested_data, int bdi_bits)
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{
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struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
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File diff suppressed because it is too large
Load Diff
172
fs/btrfs/inode.c
172
fs/btrfs/inode.c
@ -3093,178 +3093,6 @@ out:
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return err;
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}
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#if 0
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/*
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* when truncating bytes in a file, it is possible to avoid reading
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* the leaves that contain only checksum items. This can be the
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* majority of the IO required to delete a large file, but it must
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* be done carefully.
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*
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* The keys in the level just above the leaves are checked to make sure
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* the lowest key in a given leaf is a csum key, and starts at an offset
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* after the new size.
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*
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* Then the key for the next leaf is checked to make sure it also has
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* a checksum item for the same file. If it does, we know our target leaf
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* contains only checksum items, and it can be safely freed without reading
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* it.
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*
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* This is just an optimization targeted at large files. It may do
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* nothing. It will return 0 unless things went badly.
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*/
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static noinline int drop_csum_leaves(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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struct inode *inode, u64 new_size)
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{
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struct btrfs_key key;
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int ret;
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int nritems;
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struct btrfs_key found_key;
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struct btrfs_key other_key;
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struct btrfs_leaf_ref *ref;
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u64 leaf_gen;
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u64 leaf_start;
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path->lowest_level = 1;
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key.objectid = inode->i_ino;
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key.type = BTRFS_CSUM_ITEM_KEY;
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key.offset = new_size;
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again:
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0)
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goto out;
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if (path->nodes[1] == NULL) {
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ret = 0;
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goto out;
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}
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ret = 0;
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btrfs_node_key_to_cpu(path->nodes[1], &found_key, path->slots[1]);
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nritems = btrfs_header_nritems(path->nodes[1]);
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if (!nritems)
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goto out;
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if (path->slots[1] >= nritems)
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goto next_node;
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/* did we find a key greater than anything we want to delete? */
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if (found_key.objectid > inode->i_ino ||
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(found_key.objectid == inode->i_ino && found_key.type > key.type))
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goto out;
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/* we check the next key in the node to make sure the leave contains
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* only checksum items. This comparison doesn't work if our
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* leaf is the last one in the node
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*/
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if (path->slots[1] + 1 >= nritems) {
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next_node:
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/* search forward from the last key in the node, this
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* will bring us into the next node in the tree
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*/
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btrfs_node_key_to_cpu(path->nodes[1], &found_key, nritems - 1);
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/* unlikely, but we inc below, so check to be safe */
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if (found_key.offset == (u64)-1)
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goto out;
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/* search_forward needs a path with locks held, do the
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* search again for the original key. It is possible
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* this will race with a balance and return a path that
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* we could modify, but this drop is just an optimization
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* and is allowed to miss some leaves.
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*/
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btrfs_release_path(root, path);
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found_key.offset++;
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/* setup a max key for search_forward */
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other_key.offset = (u64)-1;
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other_key.type = key.type;
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other_key.objectid = key.objectid;
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path->keep_locks = 1;
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ret = btrfs_search_forward(root, &found_key, &other_key,
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path, 0, 0);
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path->keep_locks = 0;
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if (ret || found_key.objectid != key.objectid ||
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found_key.type != key.type) {
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ret = 0;
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goto out;
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}
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key.offset = found_key.offset;
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btrfs_release_path(root, path);
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cond_resched();
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goto again;
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}
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/* we know there's one more slot after us in the tree,
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* read that key so we can verify it is also a checksum item
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*/
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btrfs_node_key_to_cpu(path->nodes[1], &other_key, path->slots[1] + 1);
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if (found_key.objectid < inode->i_ino)
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goto next_key;
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if (found_key.type != key.type || found_key.offset < new_size)
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goto next_key;
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/*
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* if the key for the next leaf isn't a csum key from this objectid,
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* we can't be sure there aren't good items inside this leaf.
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* Bail out
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*/
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if (other_key.objectid != inode->i_ino || other_key.type != key.type)
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goto out;
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leaf_start = btrfs_node_blockptr(path->nodes[1], path->slots[1]);
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leaf_gen = btrfs_node_ptr_generation(path->nodes[1], path->slots[1]);
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/*
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* it is safe to delete this leaf, it contains only
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* csum items from this inode at an offset >= new_size
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*/
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ret = btrfs_del_leaf(trans, root, path, leaf_start);
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BUG_ON(ret);
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if (root->ref_cows && leaf_gen < trans->transid) {
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ref = btrfs_alloc_leaf_ref(root, 0);
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if (ref) {
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ref->root_gen = root->root_key.offset;
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ref->bytenr = leaf_start;
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ref->owner = 0;
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ref->generation = leaf_gen;
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ref->nritems = 0;
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btrfs_sort_leaf_ref(ref);
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ret = btrfs_add_leaf_ref(root, ref, 0);
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WARN_ON(ret);
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btrfs_free_leaf_ref(root, ref);
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} else {
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WARN_ON(1);
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}
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}
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next_key:
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btrfs_release_path(root, path);
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if (other_key.objectid == inode->i_ino &&
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other_key.type == key.type && other_key.offset > key.offset) {
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key.offset = other_key.offset;
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cond_resched();
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goto again;
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}
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ret = 0;
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out:
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/* fixup any changes we've made to the path */
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path->lowest_level = 0;
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path->keep_locks = 0;
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btrfs_release_path(root, path);
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return ret;
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}
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#endif
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/*
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* this can truncate away extent items, csum items and directory items.
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* It starts at a high offset and removes keys until it can't find
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@ -346,49 +346,6 @@ out_unlock:
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return ret;
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}
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#if 0
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/*
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* rate limit against the drop_snapshot code. This helps to slow down new
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* operations if the drop_snapshot code isn't able to keep up.
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*/
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static void throttle_on_drops(struct btrfs_root *root)
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{
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struct btrfs_fs_info *info = root->fs_info;
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int harder_count = 0;
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harder:
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if (atomic_read(&info->throttles)) {
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DEFINE_WAIT(wait);
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int thr;
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thr = atomic_read(&info->throttle_gen);
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do {
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prepare_to_wait(&info->transaction_throttle,
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&wait, TASK_UNINTERRUPTIBLE);
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if (!atomic_read(&info->throttles)) {
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finish_wait(&info->transaction_throttle, &wait);
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break;
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}
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schedule();
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finish_wait(&info->transaction_throttle, &wait);
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} while (thr == atomic_read(&info->throttle_gen));
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harder_count++;
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if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 &&
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harder_count < 2)
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goto harder;
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if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 &&
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harder_count < 10)
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goto harder;
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if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 &&
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harder_count < 20)
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goto harder;
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}
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}
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#endif
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void btrfs_throttle(struct btrfs_root *root)
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{
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mutex_lock(&root->fs_info->trans_mutex);
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@ -808,97 +765,6 @@ int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
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return ret;
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}
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#if 0
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/*
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* when dropping snapshots, we generate a ton of delayed refs, and it makes
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* sense not to join the transaction while it is trying to flush the current
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* queue of delayed refs out.
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*
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* This is used by the drop snapshot code only
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*/
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static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
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{
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DEFINE_WAIT(wait);
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mutex_lock(&info->trans_mutex);
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while (info->running_transaction &&
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info->running_transaction->delayed_refs.flushing) {
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prepare_to_wait(&info->transaction_wait, &wait,
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TASK_UNINTERRUPTIBLE);
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mutex_unlock(&info->trans_mutex);
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schedule();
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mutex_lock(&info->trans_mutex);
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finish_wait(&info->transaction_wait, &wait);
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}
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mutex_unlock(&info->trans_mutex);
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return 0;
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}
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/*
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* Given a list of roots that need to be deleted, call btrfs_drop_snapshot on
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* all of them
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*/
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int btrfs_drop_dead_root(struct btrfs_root *root)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *tree_root = root->fs_info->tree_root;
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unsigned long nr;
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int ret;
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while (1) {
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/*
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* we don't want to jump in and create a bunch of
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* delayed refs if the transaction is starting to close
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*/
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wait_transaction_pre_flush(tree_root->fs_info);
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trans = btrfs_start_transaction(tree_root, 1);
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/*
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* we've joined a transaction, make sure it isn't
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* closing right now
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*/
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if (trans->transaction->delayed_refs.flushing) {
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btrfs_end_transaction(trans, tree_root);
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continue;
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}
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ret = btrfs_drop_snapshot(trans, root);
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if (ret != -EAGAIN)
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break;
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ret = btrfs_update_root(trans, tree_root,
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&root->root_key,
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&root->root_item);
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if (ret)
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break;
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nr = trans->blocks_used;
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ret = btrfs_end_transaction(trans, tree_root);
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BUG_ON(ret);
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btrfs_btree_balance_dirty(tree_root, nr);
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cond_resched();
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}
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BUG_ON(ret);
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ret = btrfs_del_root(trans, tree_root, &root->root_key);
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BUG_ON(ret);
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nr = trans->blocks_used;
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ret = btrfs_end_transaction(trans, tree_root);
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BUG_ON(ret);
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free_extent_buffer(root->node);
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free_extent_buffer(root->commit_root);
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kfree(root);
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btrfs_btree_balance_dirty(tree_root, nr);
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return ret;
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}
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#endif
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/*
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* new snapshots need to be created at a very specific time in the
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* transaction commit. This does the actual creation
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