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 enum btrfs_log_mode { 15 /* Log everything about an inode. */ 16 LOG_INODE_ALL, 17 /* Log just enough to recreate the inode during log replay. */ 18 LOG_INODE_EXISTS, 19 }; 20 21 struct inode; 22 struct dentry; 23 struct btrfs_ordered_extent; 24 struct btrfs_root; 25 struct btrfs_trans_handle; 26 27 /* return value for btrfs_log_dentry_safe that means we don't need to log it at all */ 28 #define BTRFS_NO_LOG_SYNC 256 29 30 /* 31 * We can't use the tree log for whatever reason, force a transaction commit. 32 * We use a negative value because there are functions through the logging code 33 * that need to return an error (< 0 value), false (0) or true (1). Any negative 34 * value will do, as it will cause the log to be marked for a full sync. 35 */ 36 #define BTRFS_LOG_FORCE_COMMIT (-(MAX_ERRNO + 1)) 37 38 struct btrfs_log_ctx { 39 int log_ret; 40 int log_transid; 41 bool log_new_dentries; 42 bool logging_new_name; 43 bool logging_new_delayed_dentries; 44 /* Indicate if the inode being logged was logged before. */ 45 bool logged_before; 46 struct btrfs_inode *inode; 47 struct list_head list; 48 /* Only used for fast fsyncs. */ 49 struct list_head ordered_extents; 50 struct list_head conflict_inodes; 51 int num_conflict_inodes; 52 bool logging_conflict_inodes; 53 /* 54 * Used for fsyncs that need to copy items from the subvolume tree to 55 * the log tree (full sync flag set or copy everything flag set) to 56 * avoid allocating a temporary extent buffer while holding a lock on 57 * an extent buffer of the subvolume tree and under the log transaction. 58 * Also helps to avoid allocating and freeing a temporary extent buffer 59 * in case we need to process multiple leaves from the subvolume tree. 60 */ 61 struct extent_buffer *scratch_eb; 62 }; 63 64 void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, struct btrfs_inode *inode); 65 void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx); 66 void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx); 67 68 static inline void btrfs_set_log_full_commit(struct btrfs_trans_handle *trans) 69 { 70 WRITE_ONCE(trans->fs_info->last_trans_log_full_commit, trans->transid); 71 } 72 73 static inline int btrfs_need_log_full_commit(struct btrfs_trans_handle *trans) 74 { 75 return READ_ONCE(trans->fs_info->last_trans_log_full_commit) == 76 trans->transid; 77 } 78 79 int btrfs_sync_log(struct btrfs_trans_handle *trans, 80 struct btrfs_root *root, struct btrfs_log_ctx *ctx); 81 void btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root); 82 void btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); 83 int btrfs_recover_log_trees(struct btrfs_root *tree_root); 84 int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, 85 struct dentry *dentry, 86 struct btrfs_log_ctx *ctx); 87 void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, 88 const struct fscrypt_str *name, 89 struct btrfs_inode *dir, u64 index); 90 void btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, 91 const struct fscrypt_str *name, 92 struct btrfs_inode *inode, 93 struct btrfs_inode *dir); 94 void btrfs_end_log_trans(struct btrfs_root *root); 95 void btrfs_pin_log_trans(struct btrfs_root *root); 96 void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, 97 struct btrfs_inode *dir, struct btrfs_inode *inode, 98 bool for_rename); 99 void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans, 100 struct btrfs_inode *dir); 101 void btrfs_record_new_subvolume(const struct btrfs_trans_handle *trans, 102 struct btrfs_inode *dir); 103 void btrfs_log_new_name(struct btrfs_trans_handle *trans, 104 struct dentry *old_dentry, struct btrfs_inode *old_dir, 105 u64 old_dir_index, struct dentry *parent); 106 107 #endif 108