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Revert "io_uring/rsrc: disallow multi-source reg buffers"

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This reverts commit edd4782696.

There's really no specific need to disallow multiple sources of buffers,
and io_uring really should not be mandating this by itself. We should
be able to solely rely on GUP making these decisions.

As this also stands in the way of a cleanup where io_uring is the odd
one out, kill it.

Link: https://lore.kernel.org/all/61ded378-51a8-1dcb-b631-fda1903248a9@gmail.com/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-04-19 14:16:03 -06:00
parent ea97f6c855
commit 3c85cc43c8
1 changed files with 5 additions and 8 deletions
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13
io_uring/rsrc.c
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@ -1053,17 +1053,14 @@ struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages)
pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM,
pages, vmas);
if (pret == nr_pages) {
struct file *file = vmas[0]->vm_file;
/* don't support file backed memory */
for (i = 0; i < nr_pages; i++) {
if (vmas[i]->vm_file != file) {
ret = -EINVAL;
break;
}
if (!file)
struct vm_area_struct *vma = vmas[i];
if (vma_is_shmem(vma))
continue;
if (!vma_is_shmem(vmas[i]) && !is_file_hugepages(file)) {
if (vma->vm_file &&
!is_file_hugepages(vma->vm_file)) {
ret = -EOPNOTSUPP;
break;
}