#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/blkdev.h>
-#include <linux/backing-dev.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/cpuset.h>
}
EXPORT_SYMBOL(__lock_page);
-int fastcall __lock_page_killable(struct page *page)
+int __lock_page_killable(struct page *page)
{
DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
}
EXPORT_SYMBOL(iov_iter_copy_from_user);
-static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes)
+void iov_iter_advance(struct iov_iter *i, size_t bytes)
{
+ BUG_ON(i->count < bytes);
+
if (likely(i->nr_segs == 1)) {
i->iov_offset += bytes;
+ i->count -= bytes;
} else {
const struct iovec *iov = i->iov;
size_t base = i->iov_offset;
/*
* The !iov->iov_len check ensures we skip over unlikely
- * zero-length segments.
+ * zero-length segments (without overruning the iovec).
*/
- while (bytes || !iov->iov_len) {
- int copy = min(bytes, iov->iov_len - base);
+ while (bytes || unlikely(!iov->iov_len && i->count)) {
+ int copy;
+ copy = min(bytes, iov->iov_len - base);
+ BUG_ON(!i->count || i->count < copy);
+ i->count -= copy;
bytes -= copy;
base += copy;
if (iov->iov_len == base) {
i->iov_offset = base;
}
}
-
-void iov_iter_advance(struct iov_iter *i, size_t bytes)
-{
- BUG_ON(i->count < bytes);
-
- __iov_iter_advance_iov(i, bytes);
- i->count -= bytes;
-}
EXPORT_SYMBOL(iov_iter_advance);
/*