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cifs: don't use memcpy() to copy struct iov_iter 

it's not 70s anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-09-21 18:18:23 -04:00
parent 4bce9f6ee8
commit fc56b9838a
1 changed files with 4 additions and 10 deletions
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14
fs/cifs/file.c
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@ -2478,7 +2478,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
size_t cur_len;
unsigned long nr_pages, num_pages, i;
struct cifs_writedata *wdata;
struct iov_iter saved_from;
struct iov_iter saved_from = *from;
loff_t saved_offset = offset;
pid_t pid;
struct TCP_Server_Info *server;
@ -2489,7 +2489,6 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
pid = current->tgid;
server = tlink_tcon(open_file->tlink)->ses->server;
memcpy(&saved_from, from, sizeof(struct iov_iter));
do {
unsigned int wsize, credits;
@ -2551,8 +2550,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
kref_put(&wdata->refcount,
cifs_uncached_writedata_release);
if (rc == -EAGAIN) {
memcpy(from, &saved_from,
sizeof(struct iov_iter));
*from = saved_from;
iov_iter_advance(from, offset - saved_offset);
continue;
}
@ -2576,7 +2574,7 @@ ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
struct cifs_sb_info *cifs_sb;
struct cifs_writedata *wdata, *tmp;
struct list_head wdata_list;
struct iov_iter saved_from;
struct iov_iter saved_from = *from;
int rc;
/*
@ -2597,8 +2595,6 @@ ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
if (!tcon->ses->server->ops->async_writev)
return -ENOSYS;
memcpy(&saved_from, from, sizeof(struct iov_iter));
rc = cifs_write_from_iter(iocb->ki_pos, iov_iter_count(from), from,
open_file, cifs_sb, &wdata_list);
@ -2631,13 +2627,11 @@ restart_loop:
/* resend call if it's a retryable error */
if (rc == -EAGAIN) {
struct list_head tmp_list;
struct iov_iter tmp_from;
struct iov_iter tmp_from = saved_from;
INIT_LIST_HEAD(&tmp_list);
list_del_init(&wdata->list);
memcpy(&tmp_from, &saved_from,
sizeof(struct iov_iter));
iov_iter_advance(&tmp_from,
wdata->offset - iocb->ki_pos);