Multi-access to a data file stored in a data-storage system related to a buffer memory

A method for managing a buffer memory space (125) associated with a persistent data storage system (2) of a computing machine, said buffer memory space being suitable for temporarily storing, in the RAM (1) of the machine, a set of portions (126) of a single data file (210) of the persistent data storage system, said portions having respectively been previously accessed by one or more processes (111, 112, 113) executed on the computing machine, the method comprising the following steps, implemented by an operating system of the machine:

• tracking each of the portions of the file that are projected in the buffer memory space by a determined associated descriptor (131, 132, 133), said associated descriptor belonging to a plurality (130) of buffer memory projection descriptors which are all associated with the tracking of a subset of the set of portions of the file projected in the buffer memory space;
• processing a request for access to a portion of the file by a process executed on the machine, using the buffer memory projection descriptor associated with said file portion to identify whether said file portion is projected in the buffer memory space.