[f2fs folks Cc'd]
There's something very odd in f2fs_rename();
this:
f2fs_down_write(&F2FS_I(old_inode)->i_sem);
if (!old_dir_entry || whiteout)
file_lost_pino(old_inode);
else
/* adjust dir's i_pino to pass fsck check */
f2fs_i_pino_write(old_inode, new_dir->i_ino);
f2fs_up_write(&F2FS_I(old_inode)->i_sem);
and this:
if (old_dir != new_dir && !whiteout)
f2fs_set_link(old_inode, old_dir_entry,
old_dir_page, new_dir);
else
f2fs_put_page(old_dir_page, 0);
The latter really stinks, especially considering
struct dentry *f2fs_get_parent(struct dentry *child)
{
struct page *page;
unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page);
if (!ino) {
if (IS_ERR(page))
return ERR_CAST(page);
return ERR_PTR(-ENOENT);
}
return d_obtain_alias(f2fs_iget(child->d_sb, ino));
}
You want correct inumber in the ".." link. And cross-directory
rename does move the source to new parent, even if you'd been asked
to leave a whiteout in the old place.
Why is that stuff conditional on whiteout? AFAICS, that went into the
tree in the same commit that added RENAME_WHITEOUT support on f2fs,
mentioning "For now, we just try to follow the way that xfs/ext4 use"
in commit message. But ext4 does *NOT* do anything of that sort -
at the time of that commit the relevant piece had been
if (old.dir_bh) {
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
and old.dir_bh is set by
retval = ext4_rename_dir_prepare(handle, &old);
a few lines prior, which is not conditional upon the whiteout.
What am I missing there?
