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![David Sterba](/assets/img/avatar_default.png)
There's only one function we pass to iterate_inodes_from_logical as iterator, so we can drop the indirection and call it directly, after moving the function to backref.c Signed-off-by: David Sterba <dsterba@suse.com>
381 lines
10 KiB
C
381 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2011 STRATO. All rights reserved.
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*/
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#ifndef BTRFS_BACKREF_H
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#define BTRFS_BACKREF_H
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#include <linux/btrfs.h>
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#include "ulist.h"
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#include "disk-io.h"
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#include "extent_io.h"
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struct inode_fs_paths {
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struct btrfs_path *btrfs_path;
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struct btrfs_root *fs_root;
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struct btrfs_data_container *fspath;
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};
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typedef int (iterate_extent_inodes_t)(u64 inum, u64 offset, u64 root,
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void *ctx);
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int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
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struct btrfs_path *path, struct btrfs_key *found_key,
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u64 *flags);
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int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
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struct btrfs_key *key, struct btrfs_extent_item *ei,
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u32 item_size, u64 *out_root, u8 *out_level);
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int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
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u64 extent_item_objectid,
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u64 extent_offset, int search_commit_root,
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iterate_extent_inodes_t *iterate, void *ctx,
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bool ignore_offset);
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int iterate_inodes_from_logical(u64 logical, struct btrfs_fs_info *fs_info,
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struct btrfs_path *path, void *ctx,
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bool ignore_offset);
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int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
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int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 time_seq, struct ulist **leafs,
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const u64 *extent_item_pos, bool ignore_offset);
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int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 time_seq, struct ulist **roots,
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bool skip_commit_root_sem);
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char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
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u32 name_len, unsigned long name_off,
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struct extent_buffer *eb_in, u64 parent,
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char *dest, u32 size);
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struct btrfs_data_container *init_data_container(u32 total_bytes);
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struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
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struct btrfs_path *path);
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void free_ipath(struct inode_fs_paths *ipath);
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int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
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u64 start_off, struct btrfs_path *path,
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struct btrfs_inode_extref **ret_extref,
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u64 *found_off);
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int btrfs_check_shared(struct btrfs_root *root, u64 inum, u64 bytenr,
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struct ulist *roots, struct ulist *tmp_ulist);
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int __init btrfs_prelim_ref_init(void);
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void __cold btrfs_prelim_ref_exit(void);
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struct prelim_ref {
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struct rb_node rbnode;
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u64 root_id;
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struct btrfs_key key_for_search;
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int level;
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int count;
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struct extent_inode_elem *inode_list;
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u64 parent;
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u64 wanted_disk_byte;
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};
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/*
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* Iterate backrefs of one extent.
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*
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* Now it only supports iteration of tree block in commit root.
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*/
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struct btrfs_backref_iter {
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u64 bytenr;
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struct btrfs_path *path;
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struct btrfs_fs_info *fs_info;
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struct btrfs_key cur_key;
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u32 item_ptr;
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u32 cur_ptr;
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u32 end_ptr;
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};
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struct btrfs_backref_iter *btrfs_backref_iter_alloc(
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struct btrfs_fs_info *fs_info, gfp_t gfp_flag);
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static inline void btrfs_backref_iter_free(struct btrfs_backref_iter *iter)
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{
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if (!iter)
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return;
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btrfs_free_path(iter->path);
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kfree(iter);
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}
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static inline struct extent_buffer *btrfs_backref_get_eb(
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struct btrfs_backref_iter *iter)
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{
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if (!iter)
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return NULL;
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return iter->path->nodes[0];
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}
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/*
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* For metadata with EXTENT_ITEM key (non-skinny) case, the first inline data
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* is btrfs_tree_block_info, without a btrfs_extent_inline_ref header.
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*
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* This helper determines if that's the case.
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*/
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static inline bool btrfs_backref_has_tree_block_info(
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struct btrfs_backref_iter *iter)
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{
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if (iter->cur_key.type == BTRFS_EXTENT_ITEM_KEY &&
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iter->cur_ptr - iter->item_ptr == sizeof(struct btrfs_extent_item))
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return true;
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return false;
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}
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int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr);
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int btrfs_backref_iter_next(struct btrfs_backref_iter *iter);
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static inline bool btrfs_backref_iter_is_inline_ref(
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struct btrfs_backref_iter *iter)
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{
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if (iter->cur_key.type == BTRFS_EXTENT_ITEM_KEY ||
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iter->cur_key.type == BTRFS_METADATA_ITEM_KEY)
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return true;
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return false;
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}
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static inline void btrfs_backref_iter_release(struct btrfs_backref_iter *iter)
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{
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iter->bytenr = 0;
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iter->item_ptr = 0;
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iter->cur_ptr = 0;
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iter->end_ptr = 0;
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btrfs_release_path(iter->path);
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memset(&iter->cur_key, 0, sizeof(iter->cur_key));
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}
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/*
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* Backref cache related structures
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*
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* The whole objective of backref_cache is to build a bi-directional map
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* of tree blocks (represented by backref_node) and all their parents.
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*/
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/*
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* Represent a tree block in the backref cache
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*/
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struct btrfs_backref_node {
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struct {
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struct rb_node rb_node;
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u64 bytenr;
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}; /* Use rb_simple_node for search/insert */
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u64 new_bytenr;
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/* Objectid of tree block owner, can be not uptodate */
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u64 owner;
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/* Link to pending, changed or detached list */
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struct list_head list;
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/* List of upper level edges, which link this node to its parents */
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struct list_head upper;
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/* List of lower level edges, which link this node to its children */
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struct list_head lower;
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/* NULL if this node is not tree root */
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struct btrfs_root *root;
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/* Extent buffer got by COWing the block */
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struct extent_buffer *eb;
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/* Level of the tree block */
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unsigned int level:8;
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/* Is the block in a non-shareable tree */
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unsigned int cowonly:1;
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/* 1 if no child node is in the cache */
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unsigned int lowest:1;
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/* Is the extent buffer locked */
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unsigned int locked:1;
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/* Has the block been processed */
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unsigned int processed:1;
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/* Have backrefs of this block been checked */
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unsigned int checked:1;
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/*
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* 1 if corresponding block has been COWed but some upper level block
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* pointers may not point to the new location
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*/
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unsigned int pending:1;
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/* 1 if the backref node isn't connected to any other backref node */
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unsigned int detached:1;
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/*
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* For generic purpose backref cache, where we only care if it's a reloc
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* root, doesn't care the source subvolid.
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*/
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unsigned int is_reloc_root:1;
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};
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#define LOWER 0
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#define UPPER 1
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/*
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* Represent an edge connecting upper and lower backref nodes.
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*/
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struct btrfs_backref_edge {
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/*
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* list[LOWER] is linked to btrfs_backref_node::upper of lower level
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* node, and list[UPPER] is linked to btrfs_backref_node::lower of
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* upper level node.
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*
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* Also, build_backref_tree() uses list[UPPER] for pending edges, before
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* linking list[UPPER] to its upper level nodes.
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*/
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struct list_head list[2];
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/* Two related nodes */
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struct btrfs_backref_node *node[2];
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};
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struct btrfs_backref_cache {
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/* Red black tree of all backref nodes in the cache */
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struct rb_root rb_root;
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/* For passing backref nodes to btrfs_reloc_cow_block */
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struct btrfs_backref_node *path[BTRFS_MAX_LEVEL];
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/*
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* List of blocks that have been COWed but some block pointers in upper
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* level blocks may not reflect the new location
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*/
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struct list_head pending[BTRFS_MAX_LEVEL];
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/* List of backref nodes with no child node */
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struct list_head leaves;
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/* List of blocks that have been COWed in current transaction */
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struct list_head changed;
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/* List of detached backref node. */
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struct list_head detached;
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u64 last_trans;
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int nr_nodes;
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int nr_edges;
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/* List of unchecked backref edges during backref cache build */
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struct list_head pending_edge;
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/* List of useless backref nodes during backref cache build */
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struct list_head useless_node;
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struct btrfs_fs_info *fs_info;
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/*
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* Whether this cache is for relocation
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*
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* Reloction backref cache require more info for reloc root compared
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* to generic backref cache.
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*/
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unsigned int is_reloc;
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};
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void btrfs_backref_init_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_backref_cache *cache, int is_reloc);
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struct btrfs_backref_node *btrfs_backref_alloc_node(
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struct btrfs_backref_cache *cache, u64 bytenr, int level);
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struct btrfs_backref_edge *btrfs_backref_alloc_edge(
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struct btrfs_backref_cache *cache);
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#define LINK_LOWER (1 << 0)
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#define LINK_UPPER (1 << 1)
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static inline void btrfs_backref_link_edge(struct btrfs_backref_edge *edge,
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struct btrfs_backref_node *lower,
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struct btrfs_backref_node *upper,
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int link_which)
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{
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ASSERT(upper && lower && upper->level == lower->level + 1);
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edge->node[LOWER] = lower;
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edge->node[UPPER] = upper;
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if (link_which & LINK_LOWER)
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list_add_tail(&edge->list[LOWER], &lower->upper);
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if (link_which & LINK_UPPER)
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list_add_tail(&edge->list[UPPER], &upper->lower);
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}
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static inline void btrfs_backref_free_node(struct btrfs_backref_cache *cache,
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struct btrfs_backref_node *node)
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{
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if (node) {
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ASSERT(list_empty(&node->list));
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ASSERT(list_empty(&node->lower));
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ASSERT(node->eb == NULL);
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cache->nr_nodes--;
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btrfs_put_root(node->root);
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kfree(node);
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}
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}
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static inline void btrfs_backref_free_edge(struct btrfs_backref_cache *cache,
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struct btrfs_backref_edge *edge)
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{
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if (edge) {
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cache->nr_edges--;
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kfree(edge);
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}
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}
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static inline void btrfs_backref_unlock_node_buffer(
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struct btrfs_backref_node *node)
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{
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if (node->locked) {
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btrfs_tree_unlock(node->eb);
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node->locked = 0;
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}
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}
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static inline void btrfs_backref_drop_node_buffer(
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struct btrfs_backref_node *node)
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{
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if (node->eb) {
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btrfs_backref_unlock_node_buffer(node);
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free_extent_buffer(node->eb);
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node->eb = NULL;
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}
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}
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/*
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* Drop the backref node from cache without cleaning up its children
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* edges.
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*
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* This can only be called on node without parent edges.
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* The children edges are still kept as is.
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*/
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static inline void btrfs_backref_drop_node(struct btrfs_backref_cache *tree,
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struct btrfs_backref_node *node)
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{
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ASSERT(list_empty(&node->upper));
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btrfs_backref_drop_node_buffer(node);
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list_del_init(&node->list);
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list_del_init(&node->lower);
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if (!RB_EMPTY_NODE(&node->rb_node))
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rb_erase(&node->rb_node, &tree->rb_root);
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btrfs_backref_free_node(tree, node);
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}
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void btrfs_backref_cleanup_node(struct btrfs_backref_cache *cache,
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struct btrfs_backref_node *node);
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void btrfs_backref_release_cache(struct btrfs_backref_cache *cache);
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static inline void btrfs_backref_panic(struct btrfs_fs_info *fs_info,
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u64 bytenr, int errno)
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{
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btrfs_panic(fs_info, errno,
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"Inconsistency in backref cache found at offset %llu",
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bytenr);
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}
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int btrfs_backref_add_tree_node(struct btrfs_backref_cache *cache,
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struct btrfs_path *path,
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struct btrfs_backref_iter *iter,
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struct btrfs_key *node_key,
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struct btrfs_backref_node *cur);
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int btrfs_backref_finish_upper_links(struct btrfs_backref_cache *cache,
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struct btrfs_backref_node *start);
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void btrfs_backref_error_cleanup(struct btrfs_backref_cache *cache,
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struct btrfs_backref_node *node);
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#endif
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