Re: [RFC] what to do with IOCB_DSYNC?

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On Mon, Jun 21, 2021 at 03:59:58PM +0200, Christoph Hellwig wrote:
> What about just setting O_DSYNC in f_flags at open time if a superblock
> has SB_SYNCHRONOUS set?  That means the flag won't be picked up for open
> files when SB_SYNCHRONOUS is set at remount time, but I'm not even sure
> we need to support it for remount.

i suggested that to viro last night, and he pointed out that ioctl(S_SYNC)
would also not be reflected in open files.  that's more of a concern,
i think.  if only we had the revoke() infrastructure (ie could walk
currently-open files on an inode).



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