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give ->direct_IO() a copy of iov_iter

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the thing is, we want to advance what's given to ->direct_IO() as we
are forming the request; however, the callers care about the amount
of data actually transferred, not the amount we tried to transfer.
It's more convenient to allow ->direct_IO() instances do use
iov_iter_advance() on the copy of iov_iter, leaving the actual
advancing of the original to caller.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-03-10 14:08:45 -04:00
parent 31b140398c
commit 26978b8b4d
1 changed files with 7 additions and 3 deletions
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10
mm/filemap.c
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@ -1699,8 +1699,10 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
size = i_size_read(inode);
retval = filemap_write_and_wait_range(mapping, pos,
pos + count - 1);
if (!retval)
retval = mapping->a_ops->direct_IO(READ, iocb, &i, pos);
if (!retval) {
struct iov_iter data = i;
retval = mapping->a_ops->direct_IO(READ, iocb, &data, pos);
}
if (retval > 0) {
*ppos = pos + retval;
@ -2351,6 +2353,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
ssize_t written;
size_t write_len;
pgoff_t end;
struct iov_iter data;
if (count != ocount)
from->nr_segs = iov_shorten((struct iovec *)from->iov, from->nr_segs, count);
@ -2382,7 +2385,8 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
}
}
written = mapping->a_ops->direct_IO(WRITE, iocb, from, pos);
data = *from;
written = mapping->a_ops->direct_IO(WRITE, iocb, &data, pos);
/*
* Finally, try again to invalidate clean pages which might have been