| Re: [PATCH] incorrect error handling inside generic_file_direct_write [message #9059 is a reply to message #9006] |
Fri, 15 December 2006 10:43   |
Christoph Hellwig
Messages: 59
Registered: April 2006
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Member |
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> +ssize_t
> +__generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
> + unsigned long nr_segs, loff_t pos)
I'd still call this generic_file_aio_write_nolock.
> + loff_t *ppos = &iocb->ki_pos;
I'd rather use iocb->ki_pos directly in the few places ppos is referenced
currently.
> if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
> - ssize_t err;
> -
> err = sync_page_range_nolock(inode, mapping, pos, ret);
> if (err < 0)
> ret = err;
> }
So we're doing the sync_page_range once in __generic_file_aio_write
with i_mutex held.
> mutex_lock(&inode->i_mutex);
> - ret = __generic_file_aio_write_nolock(iocb, iov, nr_segs,
> - &iocb->ki_pos);
> + ret = __generic_file_aio_write(iocb, iov, nr_segs, pos);
> mutex_unlock(&inode->i_mutex);
>
> if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
And then another time after it's unlocked, this seems wrong.
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