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fuse: don't use fuse_ioctl_copy_user() helper

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The two invocations share little code.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2016-10-01 07:32:33 +02:00
parent 3daa9c5165
commit acbe5fda1f
1 changed files with 18 additions and 34 deletions
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52
fs/fuse/file.c
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@ -2326,33 +2326,6 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence)
return retval;
}
static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
unsigned int nr_segs, size_t bytes, bool to_user)
{
struct iov_iter ii;
int page_idx = 0;
if (!bytes)
return 0;
iov_iter_init(&ii, to_user ? READ : WRITE, iov, nr_segs, bytes);
while (iov_iter_count(&ii)) {
struct page *page = pages[page_idx++];
size_t copied;
if (!to_user)
copied = copy_page_from_iter(page, 0, PAGE_SIZE, &ii);
else
copied = copy_page_to_iter(page, 0, PAGE_SIZE, &ii);
if (unlikely(copied != PAGE_SIZE && iov_iter_count(&ii)))
return -EFAULT;
}
return 0;
}
/*
* CUSE servers compiled on 32bit broke on 64bit kernels because the
* ABI was defined to be 'struct iovec' which is different on 32bit
@ -2504,8 +2477,9 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
struct iovec *iov_page = NULL;
struct iovec *in_iov = NULL, *out_iov = NULL;
unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
size_t in_size, out_size, transferred;
int err;
size_t in_size, out_size, transferred, c;
int err, i;
struct iov_iter ii;
#if BITS_PER_LONG == 32
inarg.flags |= FUSE_IOCTL_32BIT;
@ -2587,10 +2561,13 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
req->in.args[1].size = in_size;
req->in.argpages = 1;
err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size,
false);
if (err)
goto out;
err = -EFAULT;
iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size);
for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) {
c = copy_page_from_iter(pages[i], 0, PAGE_SIZE, &ii);
if (c != PAGE_SIZE && iov_iter_count(&ii))
goto out;
}
}
req->out.numargs = 2;
@ -2656,7 +2633,14 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
if (transferred > inarg.out_size)
goto out;
err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true);
err = -EFAULT;
iov_iter_init(&ii, READ, out_iov, out_iovs, transferred);
for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) {
c = copy_page_to_iter(pages[i], 0, PAGE_SIZE, &ii);
if (c != PAGE_SIZE && iov_iter_count(&ii))
goto out;
}
err = 0;
out:
if (req)
fuse_put_request(fc, req);