Re: File IO write flush time span

[Richard Weinberger <richard.weinberger@xxxxxxxxx>]

On Tue, Feb 25, 2020 at 9:45 AM JH <jupiter.hce@xxxxxxxxx> wrote:
> I was actually talking about applications write files to a UBIFS
> volume mounted as RW in Linux, let's say if I write a file by vi, will
> it immediately flush to the NAND or will it stay in cache until some
> algorithm in MTD to erase NAND pages and flush the cache to NAND page
> based on size of output or time, is it correct?

UBIFS is a filesystem and follows the rules of the vfs and pagecache.
But it is less forgiving than ext3/4. To make sure data hits the NAND you
need to properly use fsync/fdatasync().

-- 
Thanks,
//richard

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