On 07/31, Chao Yu wrote:
> On 2024/7/31 0:26, Jaegeuk Kim wrote:
> > On 07/30, Chao Yu wrote:
> > > On 2024/7/30 0:26, Jaegeuk Kim wrote:
> > > > On 07/26, Chao Yu wrote:
> > > > > We should always truncate pagecache while truncating on-disk data.
> > > > >
> > > > > Fixes: a46bebd502fe ("f2fs: synchronize atomic write aborts")
> > > > > Signed-off-by: Chao Yu <c...@kernel.org>
> > > > > ---
> > > > > v2:
> > > > > - fix to use cow_inode instead of inode
> > > > > fs/f2fs/file.c | 1 +
> > > > > 1 file changed, 1 insertion(+)
> > > > >
> > > > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > > > > index 6c62f76474d1..54886ddcb8ab 100644
> > > > > --- a/fs/f2fs/file.c
> > > > > +++ b/fs/f2fs/file.c
> > > > > @@ -2202,6 +2202,7 @@ static int f2fs_ioc_start_atomic_write(struct
> > > > > file *filp, bool truncate)
> > > > > F2FS_I(fi->cow_inode)->atomic_inode = inode;
> > > > > } else {
> > > > > /* Reuse the already created COW inode */
> > > > > + truncate_setsize(fi->cow_inode, 0);
> > > >
> > > > What if the below truncation failed?
> > >
> > > What about just dropping page cache and do not set isize to 0?
> >
> > Can we also check if there's any dirty page before truncating it?
>
> Sure, so how about this?
>
> /* Reuse the already created COW inode */
> if (get_dirty_pages(fi->cow_inode)) {
Was supposed to be a bug here?
> ret = filemap_write_and_wait(fi->cow_inode->i_mapping);
> if (ret) {
> f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
> goto out;
> }
> }
>
> truncate_inode_pages(fi->cow_inode->i_mapping, 0);
invalidate_mapping_pages() would be much safer?
>
> ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
> if (ret) {
> f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
> goto out;
> }
>
> i_size_write(fi->cow_inode, 0);
>
> Thanks,
>
> >
> > >
> > > Thanks,
> > >
> > > >
> > > > > ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
> > > > > if (ret) {
> > > > > f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
> > > > > --
> > > > > 2.40.1
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