Messages in this thread | | | Date | Wed, 3 May 2006 18:35:15 +0400 | From | Oleg Nesterov <> | Subject | Re: splice(SPLICE_F_MOVE) problems |
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On 05/03, Jens Axboe wrote: > > On Wed, May 03 2006, Oleg Nesterov wrote: > > > However, user_page_pipe_buf_steal() returns unlocked page in > > PIPE_BUF_FLAG_GIFT case. So, if add_to_page_cache() fails, > > unlock_page() will trigger BUG(). > > It does, it calls generic_pipe_buf_steal() which locks it.
What I have in splice.c:
static int user_page_pipe_buf_steal(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { if (!(buf->flags & PIPE_BUF_FLAG_GIFT)) return 1;
return 0; }
(I don't use git, reading Linus's tree via http).
> > ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len); > > if (ret == AOP_TRUNCATED_PAGE) { > > page_cache_release(page); > > goto find_page; > > > > We also need to unlock(page) if it was stealed. > > Are you sure that's the right test? Don't you mean if ret != > AOP_TRUNCATED_PAGE && ret? > > How about the attached?
Ah, yes, you are right. Sorry for confusion.
Oleg.
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