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 14 struct inode; 15 struct dentry; 16 struct btrfs_ordered_extent; 17 struct btrfs_root; 18 struct 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 31 struct 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 57 void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, struct btrfs_inode *inode); 58 void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx); 59 void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx); 60 61 static 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 66 static 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 72 int btrfs_sync_log(struct btrfs_trans_handle *trans, 73 struct btrfs_root *root, struct btrfs_log_ctx *ctx); 74 int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root); 75 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, 76 struct btrfs_fs_info *fs_info); 77 int btrfs_recover_log_trees(struct btrfs_root *tree_root); 78 int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, 79 struct dentry *dentry, 80 struct btrfs_log_ctx *ctx); 81 void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, 82 const struct fscrypt_str *name, 83 struct btrfs_inode *dir, u64 index); 84 void 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); 88 void btrfs_end_log_trans(struct btrfs_root *root); 89 void btrfs_pin_log_trans(struct btrfs_root *root); 90 void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, 91 struct btrfs_inode *dir, struct btrfs_inode *inode, 92 bool for_rename); 93 void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans, 94 struct btrfs_inode *dir); 95 void btrfs_record_new_subvolume(const struct btrfs_trans_handle *trans, 96 struct btrfs_inode *dir); 97 void 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 102