File data access method, apparatus, and computer-readable storage medium

A file data access apparatus, comprising:

• a memory, configured to store a computer program;
• and
• a processor, configured to execute the computer program, and upon execution of the computer program, is configured to:
• in response to a determination that a file copy instruction is received, create a backup file comprising no data object;
• record, in metadata of an original file, identification information of the backup file, and record, in metadata of the backup file, identification information of the original file;
• in response to a determination that a read instruction for a target file is received, determine whether there is a data object corresponding to the target file;
• in response to a determination that there is the data object corresponding to the target file, read the data object;
• in response to a determination that there is no data object corresponding to the target file, determine whether there is a first target original file associated with the target file according to identification information recorded in metadata of the target file;
• in response to a determination that there is the first target original file associated with the target file according to the identification information recorded in the metadata of the target file, read a data object of the first target original file;
• and
• in response to a determination that there is no data object corresponding to the target file and no target original file associated with the target file is able to be determined according to the identification information recorded in the metadata of the target file, giving an alarm prompt.

A non-transitory storage medium, storing a computer program that is executable by a processor, wherein upon execution by the processor, is configured to cause the processor to:

• in response to a determination that a file copy instruction is received, create a backup file comprising no data object;
• record, in metadata of an original file, identification information of the backup file, and record, in metadata of the backup file, identification information of the original file;
• in response to a determination that a read instruction for a target file is received, determine whether there is a data object corresponding to the target file;
• in response to a determination that there is the data object corresponding to the target file, read the data object;
• in response to a determination that there is no data object corresponding to the target file, determine whether there is a first target original file associated with the target file according to identification information recorded in metadata of the target filer;
• in response to a determination that there is the first target original file associated with the target file according to the identification information recorded in the metadata of the target file, read a data object of the first target original file;
• and
• in response to a determination that there is no data object corresponding to the target file and no target original file associated with the target file is able to be determined according to the identification information recorded in the metadata of the target file, giving an alarm prompt.