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SubjectRe: [fuse-devel] [PATCH] fuse: Fix fuse_get_user_pages() return value
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Hi Seth,
On 04/19/2016 03:43 PM, Seth Forshee wrote:
> fuse_direct_io() expects this to return either 0 or a negative
> error code, but on success it may return a positive value.
> fuse_direct_io() may return this same value when the subsequent
> I/O operation doesn't transfer any data, which means that it will
> return a positive value when no bytes were transferred. This is
> obviously problematic.
>
> Fix fuse_get_user_pages() to return 0 on success. This will in
> turn make it so that fuse_direct_io() returns 0 if no bytes are
> transferred.
>
> Fixes: 742f992708df ("fuse: return patrial success from fuse_direct_io()")
> Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
> ---
> fs/fuse/file.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index b5c616c5ec98..78af5c0996b8 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1295,7 +1295,7 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
>
> *nbytesp = nbytes;
>
> - return ret;
> + return ret < 0 ? ret : 0;
> }
>
> static inline int fuse_iter_npages(const struct iov_iter *ii_p)


I have already sent a patch to the list that does exactly the same thing :)

https://sourceforge.net/p/fuse/mailman/message/34966327/

Thanks,
Ashish

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