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 "messages.h"
12 #include "ctree.h"
13 #include "transaction.h"
14
15 struct inode;
16 struct dentry;
17 struct btrfs_ordered_extent;
18 struct btrfs_root;
19 struct btrfs_trans_handle;
20
21 /* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
22 #define BTRFS_NO_LOG_SYNC 256
23
24 /*
25 * We can't use the tree log for whatever reason, force a transaction commit.
26 * We use a negative value because there are functions through the logging code
27 * that need to return an error (< 0 value), false (0) or true (1). Any negative
28 * value will do, as it will cause the log to be marked for a full sync.
29 */
30 #define BTRFS_LOG_FORCE_COMMIT (-(MAX_ERRNO + 1))
31
32 struct btrfs_log_ctx {
33 int log_ret;
34 int log_transid;
35 bool log_new_dentries;
36 bool logging_new_name;
37 bool logging_new_delayed_dentries;
38 /* Indicate if the inode being logged was logged before. */
39 bool logged_before;
40 struct btrfs_inode *inode;
41 struct list_head list;
42 /* Only used for fast fsyncs. */
43 struct list_head ordered_extents;
44 struct list_head conflict_inodes;
45 int num_conflict_inodes;
46 bool logging_conflict_inodes;
47 /*
48 * Used for fsyncs that need to copy items from the subvolume tree to
49 * the log tree (full sync flag set or copy everything flag set) to
50 * avoid allocating a temporary extent buffer while holding a lock on
51 * an extent buffer of the subvolume tree and under the log transaction.
52 * Also helps to avoid allocating and freeing a temporary extent buffer
53 * in case we need to process multiple leaves from the subvolume tree.
54 */
55 struct extent_buffer *scratch_eb;
56 };
57
58 void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, struct btrfs_inode *inode);
59 void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx);
60 void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx);
61
62 static inline void btrfs_set_log_full_commit(struct btrfs_trans_handle *trans)
63 {
64 WRITE_ONCE(trans->fs_info->last_trans_log_full_commit, trans->transid);
65 }
66
67 static inline int btrfs_need_log_full_commit(struct btrfs_trans_handle *trans)
68 {
69 return READ_ONCE(trans->fs_info->last_trans_log_full_commit) ==
70 trans->transid;
71 }
72
73 int btrfs_sync_log(struct btrfs_trans_handle *trans,
74 struct btrfs_root *root, struct btrfs_log_ctx *ctx);
75 int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
76 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
77 struct btrfs_fs_info *fs_info);
78 int btrfs_recover_log_trees(struct btrfs_root *tree_root);
79 int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
80 struct dentry *dentry,
81 struct btrfs_log_ctx *ctx);
82 void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
83 struct btrfs_root *root,
84 const struct fscrypt_str *name,
85 struct btrfs_inode *dir, u64 index);
86 void btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
87 struct btrfs_root *root,
88 const struct fscrypt_str *name,
89 struct btrfs_inode *inode, u64 dirid);
90 void btrfs_end_log_trans(struct btrfs_root *root);
91 void btrfs_pin_log_trans(struct btrfs_root *root);
92 void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
93 struct btrfs_inode *dir, struct btrfs_inode *inode,
94 bool for_rename);
95 void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
96 struct btrfs_inode *dir);
97 void btrfs_record_new_subvolume(const struct btrfs_trans_handle *trans,
98 struct btrfs_inode *dir);
99 void btrfs_log_new_name(struct btrfs_trans_handle *trans,
100 struct dentry *old_dentry, struct btrfs_inode *old_dir,
101 u64 old_dir_index, struct dentry *parent);
102
103 #endif
104
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