I think it just makes things more confused.
If we actually want to change the readdir() thing, then we should just
make the rule be:
- if the callback returns a non-zero value, the filesystem "readdir()"
function should return that value (right now they are taught to return
zero, and return errors on internal fatal things). And get rid of
"buf.error" entirely.
The reason for the whole "buf.error" etc stuff is simply because that
avoided having the low-level filesystem even care about things. But if
you really want to clean this up, we should *NOT* continue the current
- the callers should then do
error = vfs_readdir(file, filldir, &buf);
lastdirent = buf.previous;
if (lastdirent) {
error = count - buf.count;
if (put_user(file->f_pos, &lastdirent->d_off))
error = -EFAULT;
}
fput(file);
return error;
and we wouldn't need any other logic at all.
As to -EOVERFLOW, I suspect we are better off just dropping that whole
logic. Returning -EOVERFLOW and truncating the readdir listing is likely
much worse than the alternative. It made sense back when we needed to get
people to upgrade the system interfaces, now it just means that old
binaries won't work at all.
Linus
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