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85 lines
2.4 KiB
Diff
85 lines
2.4 KiB
Diff
From 4c185ce06dca14f5cea192f5a2c981ef50663f2b Mon Sep 17 00:00:00 2001
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From: Al Viro <viro@zeniv.linux.org.uk>
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Date: Fri, 20 Mar 2015 20:17:32 -0400
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Subject: aio: lift iov_iter_init() into aio_setup_..._rw()
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the only non-trivial detail is that we do it before rw_verify_area(),
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so we'd better cap the length ourselves in aio_setup_single_rw()
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case (for vectored case rw_copy_check_uvector() will do that for us).
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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---
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fs/aio.c | 17 +++++++++++------
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1 file changed, 11 insertions(+), 6 deletions(-)
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diff --git a/fs/aio.c b/fs/aio.c
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index 435ca29..7816e8e 100644
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--- a/fs/aio.c
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+++ b/fs/aio.c
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@@ -1357,7 +1357,8 @@ static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
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unsigned long *nr_segs,
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size_t *len,
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struct iovec **iovec,
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- bool compat)
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+ bool compat,
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+ struct iov_iter *iter)
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{
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ssize_t ret;
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@@ -1378,6 +1379,7 @@ static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
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/* len now reflect bytes instead of segs */
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*len = ret;
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+ iov_iter_init(iter, rw, *iovec, *nr_segs, *len);
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return 0;
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}
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@@ -1385,14 +1387,18 @@ static ssize_t aio_setup_single_vector(struct kiocb *kiocb,
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int rw, char __user *buf,
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unsigned long *nr_segs,
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size_t len,
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- struct iovec *iovec)
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+ struct iovec *iovec,
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+ struct iov_iter *iter)
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{
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+ if (len > MAX_RW_COUNT)
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+ len = MAX_RW_COUNT;
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if (unlikely(!access_ok(!rw, buf, len)))
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return -EFAULT;
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iovec->iov_base = buf;
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iovec->iov_len = len;
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*nr_segs = 1;
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+ iov_iter_init(iter, rw, iovec, *nr_segs, len);
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return 0;
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}
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@@ -1438,10 +1444,10 @@ rw_common:
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if (opcode == IOCB_CMD_PREADV || opcode == IOCB_CMD_PWRITEV)
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ret = aio_setup_vectored_rw(req, rw, buf, &nr_segs,
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- &len, &iovec, compat);
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+ &len, &iovec, compat, &iter);
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else
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ret = aio_setup_single_vector(req, rw, buf, &nr_segs,
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- len, iovec);
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+ len, iovec, &iter);
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if (!ret)
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ret = rw_verify_area(rw, file, &req->ki_pos, len);
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if (ret < 0) {
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@@ -1463,10 +1469,9 @@ rw_common:
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file_start_write(file);
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if (iter_op) {
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- iov_iter_init(&iter, rw, iovec, nr_segs, len);
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ret = iter_op(req, &iter);
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} else {
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- ret = rw_op(req, iovec, nr_segs, req->ki_pos);
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+ ret = rw_op(req, iter.iov, iter.nr_segs, req->ki_pos);
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}
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if (rw == WRITE)
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--
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cgit v1.1
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