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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-22 16:33:12 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-05 18:23:36 -0400 |
| commit | 241699cd72a8489c9446ae3910ddd243e9b9061b (patch) | |
| tree | efcd8d62f5788ab843cd3457cf2e85f3be7b5296 /fs/splice.c | |
| parent | d82718e348fee15dbce8f578ff2588982b7cc7ca (diff) | |
new iov_iter flavour: pipe-backed
iov_iter variant for passing data into pipe. copy_to_iter()
copies data into page(s) it has allocated and stuffs them into
the pipe; copy_page_to_iter() stuffs there a reference to the
page given to it. Both will try to coalesce if possible.
iov_iter_zero() is similar to copy_to_iter(); iov_iter_get_pages()
and friends will do as copy_to_iter() would have and return the
pages where the data would've been copied. iov_iter_advance()
will truncate everything past the spot it has advanced to.
New primitive: iov_iter_pipe(), used for initializing those.
pipe should be locked all along.
Running out of space acts as fault would for iovec-backed ones;
in other words, giving it to ->read_iter() may result in short
read if the pipe overflows, or -EFAULT if it happens with nothing
copied there.
In other words, ->read_iter() on those acts pretty much like
->splice_read(). Moreover, all generic_file_splice_read() users,
as well as many other ->splice_read() instances can be switched
to that scheme - that'll happen in the next commit.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/splice.c')
| -rw-r--r-- | fs/splice.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/splice.c b/fs/splice.c index e13d93531554..589a1d52bb98 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -524,7 +524,7 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, } EXPORT_SYMBOL(generic_file_splice_read); -static const struct pipe_buf_operations default_pipe_buf_ops = { +const struct pipe_buf_operations default_pipe_buf_ops = { .can_merge = 0, .confirm = generic_pipe_buf_confirm, .release = generic_pipe_buf_release, |