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This article is to share with you what Mutation related classes have. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The MutationImpl class description:

Struct MutationImpl {metareqid_t reqid; _ U32 attempt; LogSegment * log fragment submitted by ls; utime_t mds_st mds local timestamp utime_t op_stamp If the timestamp mds_rank_t slave_to_mds; provided by the client is slave_to_mds > 0, it means that this Mutation is the remote auth pins set auth_pins of set pins; mds cache pins set stickydirs; map remote_auth_pins; initiated by slave. Local auth pins list projected_inodes; list projected_fnodes; list updated_locks; list dirty_cow_inodes; list dirty_cow_dentries;}

MutationImpl class methods:

MutationImpl::get_client ()

| | _ _ reqid.name.is _ client () is not empty |

| | _ _ indicates that the request is sent from client and returns client information, that is, client_t (reqid.name.num ()) |

| | _ return-1 |

MutationImpl::apply ()

| | _ _ traverse and empty the projected_inodes array and each array member executes the pop_and_dirty_projected_inode (ls) function |

| | _ _ traverse and empty the projected_fnodes array and each array member executes the pop_and_dirty_projected_fnode (ls) function |

| | _ _ traverse the dirty_cow_inodes array |

| | _ _ each member of the array executes _ mark_dirty (ls) |

| | _ _ traverse the dirty_cow_dentries array |

| | _ _ each member of the array executes _ mark_dirty (ls) |

| | _ _ traverse the updated_locks array |

| | each member of the _ _ array executes mark_dirty () |

MutationImpl::cleanup ()

| | _ _ traverse the auth_pins array |

| | each member of the _ _ array executes auth_unpin () |

| | _ _ empty the auth_pins array |

| | _ _ traverse the pins array |

| | each member of the _ _ array executes put () |

| | _ _ empty the pins array |

MDRequestImpl mainly records requests from client, requests from slave, and internal operation internal_op.

Struct MDRequestImpl: public MutationImpl, public TrackedOp {Session * session; record session information elist::item item_session_request; request item MClientRequest * client_request; client request vector dn [2]; save two sets of dentry CInode * in [2]; save two sets of inode CDentry * straydn; records stray dentry snapid_t snapid Record the snap ID information indoeno_t alloc_ino, the inode number assigned by used_prealloc_ino;, the pre-assigned inode number int snap_caps; snap capability int getattr_caps;, the permission to execute getattr bool did_early_reply; bool o_trunc Request is an O_TRUNC event bool has_completed; request has completed the additional content contained in the reply by bufferlist reply_extra_bl; map cap_releases; MMDSSlaveRequest * slave_request; slave request int internal_op; internal operation Context * internal_op_finish Callback function of internal operation void * internal_op_private; the private object int retry; of internal operation records whether the number of times of rety bool waited_for_osdmap; needs to wait for updated osmap struct More {the collection set waiting_on_slave of slave request initiated by int slave_error; set slaves; Wait for slavereq reply's peer set witnessed; CInode * rename_inode; to save freeze's inode information whether bool is_freeze_authpin; save performed freeze authpin operation bool is_remote_frozen_authpin; save performed remote frozen authpin operation bool is_ambiguous_auth Save whether the ambiguous auth operation was performed} _ more;}

MDRequestImpl class methods:

MDRequestImpl::~MDRequestImpl ()

| | _ _ if client _ request is not empty |

| | _ _ execute the client_request- > put () method to try to release client_request |

| | _ _ if _ request is not empty |

| | _ _ execute the slave_request- > put () method to try to release slave_request |

| | _ _ delete _ more class object |

MDRequestImpl::freeze_auth_pin (inode)

| | _ _ set the rename_inode in _ more to inode |

| | _ _ set the is_freeze_authpin in _ more to true |

| | _ _ call auth_pin (inode) |

| | _ _ execute the freeze_auth_pin of inode () |

MDRequestImpl::unfreeze_auth_pin (clear_inode)

| | _ _ get the inode of freeze from the rename_inode in _ more |

| | _ _ if inode is currently is_frozen_auth_pin () |

| | _ _ execute unfreeze_auth_pin () of inode to remove freeze |

| | _ _ if inode is not is_frozen_auth_pin () |

| | _ _ execute the unfreeze_inode of inode () |

| | _ _ set the is_freeze_autpin in _ more to false |

| | _ _ clear _ inode==true |

| | _ _ set the rename_inode in _ more to null |

MDRequestImpl::set_remote_frozen_auth_pin (inode)

| | _ _ set the rename_inode in _ more to inode |

| | _ _ set the is_remote_frozen_authpin in _ more to true |

MDRequestImpl::set_ambiguous_auth (inode)

| | _ _ execute the set_ambiguous_auth () function of inode |

| | _ _ set the rename_inode in _ more to inode |

| | _ _ set the is_ambiguous_auth in _ more to true |

MDRequestImpl::clear_ambiguous_auth ()

| | _ _ get the inode of ambiguous from the rename_inode in _ more |

| | _ _ execute the clear_ambiguous_auth () function of inode |

| | _ _ set the is_ambiguous_auth in _ more to false |

MDRequestImpl::can_auth_pin (object)

| | _ _ if object can authpin or object is in auth_pin or remote authpin or is_freeze_authpin in _ more is true or rename_inode==object in _ more |

| | _ _ returns true |

| | _ _ returns false |

MDRequestImpl::drop_local_auth_pins ()

| | _ _ if _ more is not empty |

| | _ _ call unfreeze_auth_pin (true) to clear the auth pin of freeze |

| | _ _ call MutationImpl::drop_local_auth_pins () to clear the local auth pins |

MDRequestImpl::set_filepath (fp)

| | _ _ set the filepath2 in _ more to fp |

MDRequestImpl::set_filepath3 (fp)

| | _ _ set the filepath3 in _ more to fp |

MDRequestImpl::get_filepath ()

| | _ _ if client _ request is not empty |

| | _ _ returns client_request- > get_filepath () |

| | _ _ returns the filepath2 in _ more |

MDRequestImpl::get_filepath3 ()

| | _ _ if client _ request is not empty |

| | _ _ returns client_request- > get_filepath3 () |

| | _ _ returns the filepath3 in _ more |

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