提交 5b13475a 编写于 作者: L Linus Torvalds

Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull iov_iter updates from Al Viro:
 "Cleanups that sat in -next + -stable fodder that has just missed 4.11.

  There's more iov_iter work in my local tree, but I'd prefer to push
  the stuff that had been in -next first"

* 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  iov_iter: don't revert iov buffer if csum error
  generic_file_read_iter(): make use of iov_iter_revert()
  generic_file_direct_write(): make use of iov_iter_revert()
  orangefs: use iov_iter_revert()
  sctp: switch to copy_from_iter_full()
  net/9p: switch to copy_from_iter_full()
  switch memcpy_from_msg() to copy_from_iter_full()
  rds: make use of iov_iter_revert()
......@@ -114,7 +114,6 @@ static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inod
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
struct orangefs_kernel_op_s *new_op = NULL;
struct iov_iter saved = *iter;
int buffer_index = -1;
ssize_t ret;
......@@ -193,7 +192,7 @@ static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inod
orangefs_bufmap_put(buffer_index);
buffer_index = -1;
if (type == ORANGEFS_IO_WRITE)
*iter = saved;
iov_iter_revert(iter, total_size);
gossip_debug(GOSSIP_FILE_DEBUG,
"%s:going to repopulate_shared_memory.\n",
__func__);
......
......@@ -3113,7 +3113,7 @@ struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy,
static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len)
{
return copy_from_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT;
}
static inline int memcpy_to_msg(struct msghdr *msg, void *data, int len)
......
......@@ -2035,7 +2035,6 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
if (iocb->ki_flags & IOCB_DIRECT) {
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct iov_iter data = *iter;
loff_t size;
size = i_size_read(inode);
......@@ -2046,11 +2045,12 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
file_accessed(file);
retval = mapping->a_ops->direct_IO(iocb, &data);
retval = mapping->a_ops->direct_IO(iocb, iter);
if (retval >= 0) {
iocb->ki_pos += retval;
iov_iter_advance(iter, retval);
count -= retval;
}
iov_iter_revert(iter, iov_iter_count(iter) - count);
/*
* Btrfs can have a short DIO read if we encounter
......@@ -2061,7 +2061,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
* the rest of the read. Buffered reads will not work for
* DAX files, so don't bother trying.
*/
if (retval < 0 || !iov_iter_count(iter) || iocb->ki_pos >= size ||
if (retval < 0 || !count || iocb->ki_pos >= size ||
IS_DAX(inode))
goto out;
}
......@@ -2706,7 +2706,6 @@ 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;
write_len = iov_iter_count(from);
end = (pos + write_len - 1) >> PAGE_SHIFT;
......@@ -2735,8 +2734,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
}
}
data = *from;
written = mapping->a_ops->direct_IO(iocb, &data);
written = mapping->a_ops->direct_IO(iocb, from);
/*
* Finally, try again to invalidate clean pages which might have been
......@@ -2753,13 +2751,14 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
if (written > 0) {
pos += written;
iov_iter_advance(from, written);
write_len -= written;
if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
i_size_write(inode, pos);
mark_inode_dirty(inode);
}
iocb->ki_pos = pos;
}
iov_iter_revert(from, write_len - iov_iter_count(from));
out:
return written;
}
......
......@@ -592,9 +592,8 @@ static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
ename = &req->rc->sdata[req->rc->offset];
if (len > inline_len) {
/* We have error in external buffer */
err = copy_from_iter(ename + inline_len,
len - inline_len, uidata);
if (err != len - inline_len) {
if (!copy_from_iter_full(ename + inline_len,
len - inline_len, uidata)) {
err = -EFAULT;
goto out_err;
}
......
......@@ -74,7 +74,7 @@ pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size)
{
size_t len = min(pdu->capacity - pdu->size, size);
struct iov_iter i = *from;
if (copy_from_iter(&pdu->sdata[pdu->size], len, &i) != len)
if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, &i))
len = 0;
pdu->size += len;
......
......@@ -760,7 +760,7 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
if (msg_data_left(msg) < chunk) {
if (__skb_checksum_complete(skb))
goto csum_error;
return -EINVAL;
if (skb_copy_datagram_msg(skb, hlen, msg, chunk))
goto fault;
} else {
......@@ -768,15 +768,16 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
if (skb_copy_and_csum_datagram(skb, hlen, &msg->msg_iter,
chunk, &csum))
goto fault;
if (csum_fold(csum))
goto csum_error;
if (csum_fold(csum)) {
iov_iter_revert(&msg->msg_iter, chunk);
return -EINVAL;
}
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
netdev_rx_csum_fault(skb->dev);
}
return 0;
csum_error:
iov_iter_revert(&msg->msg_iter, chunk);
return -EINVAL;
fault:
return -EFAULT;
}
......
......@@ -594,7 +594,6 @@ int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
goto out;
while (1) {
struct iov_iter save;
/* If there are pending notifications, do those - and nothing else */
if (!list_empty(&rs->rs_notify_queue)) {
ret = rds_notify_queue_get(rs, msg);
......@@ -630,7 +629,6 @@ int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
rdsdebug("copying inc %p from %pI4:%u to user\n", inc,
&inc->i_conn->c_faddr,
ntohs(inc->i_hdr.h_sport));
save = msg->msg_iter;
ret = inc->i_conn->c_trans->inc_copy_to_user(inc, &msg->msg_iter);
if (ret < 0)
break;
......@@ -644,7 +642,7 @@ int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
rds_inc_put(inc);
inc = NULL;
rds_stats_inc(s_recv_deliver_raced);
msg->msg_iter = save;
iov_iter_revert(&msg->msg_iter, ret);
continue;
}
......
......@@ -1512,14 +1512,12 @@ int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
struct iov_iter *from)
{
void *target;
ssize_t copied;
/* Make room in chunk for data. */
target = skb_put(chunk->skb, len);
/* Copy data (whole iovec) into chunk */
copied = copy_from_iter(target, len, from);
if (copied != len)
if (!copy_from_iter_full(target, len, from))
return -EFAULT;
/* Adjust the chunk length field. */
......
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