* How does EXT4 ensures two processes don't modify and synchronize one page at the same time.
@ 2022-01-24 17:17 Lyu Tao
2022-01-24 18:23 ` Theodore Y. Ts'o
0 siblings, 1 reply; 2+ messages in thread
From: Lyu Tao @ 2022-01-24 17:17 UTC (permalink / raw)
To: linux-ext4@vger.kernel.org
Hi,
I'm new to file system area and have a naive question about the global sync.
Let's suppose there are two process are writing to the same file. If one process issues a sync() syscall, which mechanism can ensures the two processes don't modify and synchronize one page at the same time.
Best,
Tao
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How does EXT4 ensures two processes don't modify and synchronize one page at the same time.
2022-01-24 17:17 How does EXT4 ensures two processes don't modify and synchronize one page at the same time Lyu Tao
@ 2022-01-24 18:23 ` Theodore Y. Ts'o
0 siblings, 0 replies; 2+ messages in thread
From: Theodore Y. Ts'o @ 2022-01-24 18:23 UTC (permalink / raw)
To: Lyu Tao; +Cc: linux-ext4@vger.kernel.org
On Mon, Jan 24, 2022 at 05:17:34PM +0000, Lyu Tao wrote:
>
> I'm new to file system area and have a naive question about the global sync.
>
> Let's suppose there are two process are writing to the same file. If
> one process issues a sync() syscall, which mechanism can ensures the
> two processes don't modify and synchronize one page at the same
> time.
That's not what the sync() system call purports to do. To quote from
the sync(2) man page:
sync() causes all pending modifications to filesystem metadata
and cached file data to be written to the underlying
filesystems.
- Ted
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-01-24 18:23 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-01-24 17:17 How does EXT4 ensures two processes don't modify and synchronize one page at the same time Lyu Tao
2022-01-24 18:23 ` Theodore Y. Ts'o
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox