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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2008 Oracle. All rights reserved.
4 */
5
6#ifndef BTRFS_TREE_LOG_H
7#define BTRFS_TREE_LOG_H
8
9#include <linux/list.h>
10#include <linux/fs.h>
11#include <linux/fscrypt.h>
12#include "transaction.h"
13
14struct inode;
15struct dentry;
16struct btrfs_ordered_extent;
17struct btrfs_root;
18struct btrfs_trans_handle;
19
20/* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
21#define BTRFS_NO_LOG_SYNC 256
22
23/*
24 * We can't use the tree log for whatever reason, force a transaction commit.
25 * We use a negative value because there are functions through the logging code
26 * that need to return an error (< 0 value), false (0) or true (1). Any negative
27 * value will do, as it will cause the log to be marked for a full sync.
28 */
29#define BTRFS_LOG_FORCE_COMMIT (-(MAX_ERRNO + 1))
30
31struct btrfs_log_ctx {
32 int log_ret;
33 int log_transid;
34 bool log_new_dentries;
35 bool logging_new_name;
36 bool logging_new_delayed_dentries;
37 /* Indicate if the inode being logged was logged before. */
38 bool logged_before;
39 struct btrfs_inode *inode;
40 struct list_head list;
41 /* Only used for fast fsyncs. */
42 struct list_head ordered_extents;
43 struct list_head conflict_inodes;
44 int num_conflict_inodes;
45 bool logging_conflict_inodes;
46 /*
47 * Used for fsyncs that need to copy items from the subvolume tree to
48 * the log tree (full sync flag set or copy everything flag set) to
49 * avoid allocating a temporary extent buffer while holding a lock on
50 * an extent buffer of the subvolume tree and under the log transaction.
51 * Also helps to avoid allocating and freeing a temporary extent buffer
52 * in case we need to process multiple leaves from the subvolume tree.
53 */
54 struct extent_buffer *scratch_eb;
55};
56
57void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, struct btrfs_inode *inode);
58void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx);
59void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx);
60
61static inline void btrfs_set_log_full_commit(struct btrfs_trans_handle *trans)
62{
63 WRITE_ONCE(trans->fs_info->last_trans_log_full_commit, trans->transid);
64}
65
66static inline int btrfs_need_log_full_commit(struct btrfs_trans_handle *trans)
67{
68 return READ_ONCE(trans->fs_info->last_trans_log_full_commit) ==
69 trans->transid;
70}
71
72int btrfs_sync_log(struct btrfs_trans_handle *trans,
73 struct btrfs_root *root, struct btrfs_log_ctx *ctx);
74int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
75int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
76 struct btrfs_fs_info *fs_info);
77int btrfs_recover_log_trees(struct btrfs_root *tree_root);
78int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
79 struct dentry *dentry,
80 struct btrfs_log_ctx *ctx);
81void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
82 const struct fscrypt_str *name,
83 struct btrfs_inode *dir, u64 index);
84void btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
85 const struct fscrypt_str *name,
86 struct btrfs_inode *inode,
87 struct btrfs_inode *dir);
88void btrfs_end_log_trans(struct btrfs_root *root);
89void btrfs_pin_log_trans(struct btrfs_root *root);
90void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
91 struct btrfs_inode *dir, struct btrfs_inode *inode,
92 bool for_rename);
93void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
94 struct btrfs_inode *dir);
95void btrfs_record_new_subvolume(const struct btrfs_trans_handle *trans,
96 struct btrfs_inode *dir);
97void btrfs_log_new_name(struct btrfs_trans_handle *trans,
98 struct dentry *old_dentry, struct btrfs_inode *old_dir,
99 u64 old_dir_index, struct dentry *parent);
100
101#endif