Re: [f2fs-dev] [PATCH] Revert "f2fs: stop allocating pinned sections if EAGAIN happens"

[Chao Yu]

On 2024/9/6 16:31, Wu Bo wrote:
> On Tue, Feb 20, 2024 at 02:50:11PM +0800, Chao Yu wrote:
> > On 2024/2/8 16:11, Wu Bo wrote:
> > > On 2024/2/5 11:54, Chao Yu wrote:
> > > > How about calling f2fs_balance_fs() to double check and make sure there is
> > > > enough free space for following allocation.
> > > >
> > > >          if (has_not_enough_free_secs(sbi, 0,
> > > >              GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
> > > >              f2fs_down_write(&sbi->gc_lock);
> > > >              stat_inc_gc_call_count(sbi, FOREGROUND);
> > > >              err = f2fs_gc(sbi, &gc_control);
> > > >              if (err == -EAGAIN)
> > > >                  f2fs_balance_fs(sbi, true);
> > > >              if (err && err != -ENODATA)
> > > >                  goto out_err;
> > > >          }
> > > >
> > > > Thanks,
> > >
> > > f2fs_balance_fs() here will not change procedure branch and may just trigger another GC.
> > >
> > > I'm afraid this is a bit redundant.
> >
> > Okay.
> >
> > I guess maybe Jaegeuk has concern which is the reason to commit
> > 2e42b7f817ac ("f2fs: stop allocating pinned sections if EAGAIN happens").
>
> Hi Jaegeuk,
>
> We occasionally receive user complaints about OTA failures caused by this issue.
> Please consider merging this patch.

I'm fine w/ this patch, but one another quick fix will be triggering
background GC via f2fs ioctl after fallocate() failure, once
has_not_enough_free_secs(, ovp_segs) returns false, fallocate() will
succeed.

Reviewed-by: Chao Yu <chao@xxxxxxxxxx>

Thanks,

> Thanks
>
> > Thanks,
> >
> > > >
> >
> >
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