fs/btrfs/tree-log.h

   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