Re: [f2fs-dev] [PATCH 1/4] f2fs: fix blkofs_end correctly in f2fs_migrate_blocks()

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 03/01, Chao Yu wrote:
> On 2024/3/1 1:41, Daeho Jeong wrote:
> > On Thu, Feb 29, 2024 at 2:11 AM Chao Yu <chao@kernel.org> wrote:
> > > 
> > > Jaegeuk, Daeho,
> > > 
> > > Any comments on this serials?
> > > 
> > > Thanks,
> > 
> > No functional difference here, since start_blk is always aligned with
> > the section address.
> 
> You're right.
> 
> > However, this is more clear in itself.
> 
> Thanks for the review!
> 
> One more thing is, I found that fallocate() on pinned file will preallocate
> aligned w/ section-size which is about several hundred megabyte for ZUFS case,
> since commit e1175f022911 ("f2fs: fix to align to section for fallocate() on
> pinned file").
> 
> It looks not make sense, especially for logcat case which actually want to
> preallocate 2MB space, so, what about reverting commit e1175f022911 and
> looking for other solution to avoid GCing on fragmented pinned file.

I remember we removed the logcat case.

> 
> What do you think?
> 
> Thanks,
> 
> > 
> > Reviewed-by: Daeho Jeong <daehojeong@google.com>
> > 
> > Thanks,
> > 
> > > 
> > > On 2024/2/26 9:32, Chao Yu wrote:
> > > > In f2fs_migrate_blocks(), when traversing blocks in last section,
> > > > blkofs_end should be (start_blk + blkcnt - 1) % blk_per_sec, fix it.
> > > > 
> > > > Signed-off-by: Chao Yu <chao@kernel.org>
> > > > ---
> > > >    fs/f2fs/data.c | 5 +++--
> > > >    1 file changed, 3 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > > > index c21b92f18463..0c728e82d936 100644
> > > > --- a/fs/f2fs/data.c
> > > > +++ b/fs/f2fs/data.c
> > > > @@ -3841,13 +3841,14 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> > > >        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > > >        unsigned int blkofs;
> > > >        unsigned int blk_per_sec = BLKS_PER_SEC(sbi);
> > > > +     unsigned int end_blk = start_blk + blkcnt - 1;
> > > >        unsigned int secidx = start_blk / blk_per_sec;
> > > >        unsigned int end_sec;
> > > >        int ret = 0;
> > > > 
> > > >        if (!blkcnt)
> > > >                return 0;
> > > > -     end_sec = secidx + (blkcnt - 1) / blk_per_sec;
> > > > +     end_sec = end_blk / blk_per_sec;
> > > > 
> > > >        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
> > > >        filemap_invalidate_lock(inode->i_mapping);
> > > > @@ -3857,7 +3858,7 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> > > > 
> > > >        for (; secidx <= end_sec; secidx++) {
> > > >                unsigned int blkofs_end = secidx == end_sec ?
> > > > -                     (blkcnt - 1) % blk_per_sec : blk_per_sec - 1;
> > > > +                             end_blk % blk_per_sec : blk_per_sec - 1;
> > > > 
> > > >                f2fs_down_write(&sbi->pin_sem);
> > > > 
> > > 
> > > 
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