Method and module for improving transaction performance of F2FS file system and storage system

Abstract

The invention discloses a method and a module for improving transaction performance of an F2FS file system and a storage system, belongs to the field of file systems, and comprises the following steps: when a transaction is submitted, traversing dirty data pages of a written file F in a memory, and then traversing dirty metadata pages of the F; for the traversed dirty data / metadata page, correspondingly allocating a physical page to the current data / metadata segment of the memory; allocating an extra space to the current dirty data / metadata page in the memory, recording the physical page address allocated last time in the extra space, and recording the physical page address corresponding to the dirty data / metadata page if the dirty data / metadata page is the first traversed page; adding thedirty data / metadata page together with the additional space to the corresponding BIO; after the dirty data page is traversed, submitting the corresponding BIO; and after traversal of the dirty metadata page is finished, adding an fsync identifier to the last dirty metadata page, submitting the corresponding BIO and directly finishing the operation. The transaction performance of the F2FS file system can be effectively improved.

Description

technical field [0001] The invention belongs to the field of file systems, and more specifically relates to a method, module and storage system for improving transaction performance of an F2FS file system. Background technique [0002] Open channel solid-state disk (Open-ChannelSSD) is a new type of solid-state disk device. Different from traditional solid-state disk devices, open-channel solid-state disks do not include a flash conversion layer, and the physical address of the flash memory is handed over to the host for management. The commands sent by the host driver to the open-channel solid-state disk directly process the physical address of the flash memory. Existing flash memory chips often provide an extra storage space for each flash memory page, which is called an out-of-band area (Out of Band, OOB). The OOB and the physical page of the flash memory are read and written at the same time, and can be used to store metadata. The open channel SSD allows the device to ...

AI Technical Summary

Problems solved by technology

When the user submits the transaction, F2FS writes back and persists all the data received during the transaction. The process is as follows figure 1 shown, according to figure 1 It can be seen that in order to ensure the atomicity of transactions, F2FS needs to add PREFLUSH and FUA (that is, set the PREFLUSH flag and FUA flag to 1) to mark the BIO, which will have a negative impact on the performance of the entire system.

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