Re: [f2fs-dev] f2fs do DIO write make file corruption

[Wu Bo]

在 2021/8/11 20:57, Chao Yu 写道:
> On 2021/8/11 11:28, Wu Bo wrote:
> > 在 2021/8/11 11:03, Chao Yu 写道:
> > > On 2021/8/11 10:48, Wu Bo wrote:
> > > > I use the following command to create a file, the file may got
> > > > corruption:
> > > >      f2fs_io write 2 0 512 inc_num dio $path
> > > >
> > > > And when I use bio or to set the chunk size to 1 block, the file is
> > > > normal. The commands as following:
> > > >      f2fs_io write 2 0 512 inc_num buffered $path
> > > >      f2fs_io write 1 0 512 inc_num dio $path
> > > >
> > > > I find this bug on old kernel version 4.14.117, and not find on version
> > > > 4.19.152. So this bug is fixed. Can anyone can tell me which patch 
> > > > fixed
> > > > this bug?
> > >
> > > Not sure,
> > >
> > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=7bae8b6b73e46c307fa355ce086800b7ad6610f8 
>
> I didn't see this patch in 4.14 stable kernel of mailine, so do you mean 
> 4.14 kernel
> maintained by Android?
>
> If so, f2fs codes in between 4.14 and 4.19 Android kernel are almost the 
> same,
> see below link:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git/

Sorry, it's our old Android project code.So the kernel version may have 
no reference value.
This project code last sync to Android common kernel is:
	9f892496fc0b:f2fs: readahead encrypted block during GC[2018-09-05]
The code link is:
https://android.googlesource.com/kernel/common/+/9f892496fc0b
And after that, we applied some fixup patches.

> Thanks,
>
> > >
> >
> > This patch is applied. The issue occurs when f2fs dio try to preallocate
> > multiple blocks and got scattered disk blocks. The log as following:
> >         my_f2fs_io-13425 [002] ....   395.583637: el0_irq_naked:
> > 1:type:1,ino:40132,off:768,old_blk:0,new_blk:185764
> >         my_f2fs_io-13425 [002] ....   395.583710: el0_irq_naked:
> > 1:type:1,ino:40132,off:769,old_blk:0,new_blk:205824
> >         my_f2fs_io-13425 [002] ....   395.583721: f2fs_map_blocks: dev =
> > (259,23), ino = 40132, file offset = 768, start blkaddr = 0x2d5a4, len =
> > 0x2, err = 0
> >         my_f2fs_io-13425 [002] ....   395.583735: f2fs_map_blocks: dev =
> > (259,23), ino = 40132, file offset = 768, start blkaddr = 0x2d5a4, len =
> > 0x1, err = 0
> >         my_f2fs_io-13425 [002] ....   395.583741: f2fs_map_blocks: dev =
> > (259,23), ino = 40132, file offset = 769, start blkaddr = 0x32400, len =
> > 0x1, err = 0
> >
> > And if the blocks are continuously, the file data is normal:
> >       my_f2fs_io-13425 [002] ....   395.584037: el0_irq_naked:
> > 1:type:1,ino:40132,off:770,old_blk:0,new_blk:205825
> >         my_f2fs_io-13425 [002] ....   395.584066: el0_irq_naked:
> > 1:type:1,ino:40132,off:771,old_blk:0,new_blk:205826
> >         my_f2fs_io-13425 [002] ....   395.584077: f2fs_map_blocks: dev =
> > (259,23), ino = 40132, file offset = 770, start blkaddr = 0x32401, len =
> > 0x2, err = 0
> >         my_f2fs_io-13425 [002] ....   395.584091: f2fs_map_blocks: dev =
> > (259,23), ino = 40132, file offset = 770, start blkaddr = 0x32401, len =
> > 0x2, err = 0
> >
> > > Thanks,
> > >
> > > > _______________________________________________
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> >
> >
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