size_t count)
{
/* It will get better. Eventually... */
- if (segment_eq(get_fs(), KERNEL_DS)) {
+ if (uaccess_kernel()) {
direction |= ITER_KVEC;
i->type = direction;
i->kvec = (struct kvec *)iov;
return 0;
}
iterate_and_advance(i, bytes, v,
- __copy_from_user_nocache((to += v.iov_len) - v.iov_len,
+ __copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len,
v.iov_base, v.iov_len),
memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page,
v.bv_offset, v.bv_len),
if (unlikely(i->count < bytes))
return false;
iterate_all_kinds(i, bytes, v, ({
- if (__copy_from_user_nocache((to += v.iov_len) - v.iov_len,
+ if (__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len,
v.iov_base, v.iov_len))
return false;
0;}),
{
if (!unroll)
return;
+ if (WARN_ON(unroll > MAX_RW_COUNT))
+ return;
i->count += unroll;
if (unlikely(i->type & ITER_PIPE)) {
struct pipe_inode_info *pipe = i->pipe;
while (1) {
size_t n = off - pipe->bufs[idx].offset;
if (unroll < n) {
- off -= (n - unroll);
+ off -= unroll;
break;
}
unroll -= n;
static struct page **get_pages_array(size_t n)
{
- struct page **p = kmalloc(n * sizeof(struct page *), GFP_KERNEL);
- if (!p)
- p = vmalloc(n * sizeof(struct page *));
- return p;
+ return kvmalloc_array(n, sizeof(struct page *), GFP_KERNEL);
}
static ssize_t pipe_get_pages_alloc(struct iov_iter *i,
*
* Write out and wait upon file offsets lstart->lend, inclusive.
*
- * Note that `lend' is inclusive (describes the last byte to be written) so
+ * Note that @lend is inclusive (describes the last byte to be written) so
* that this function can be used to write to the very end-of-file (end = -1).
*/
int filemap_write_and_wait_range(struct address_space *mapping,
*
* PCG flags modify how the page is returned.
*
- * FGP_ACCESSED: the page will be marked accessed
- * FGP_LOCK: Page is return locked
- * FGP_CREAT: If page is not present then a new page is allocated using
- * @gfp_mask and added to the page cache and the VM's LRU
- * list. The page is returned locked and with an increased
- * refcount. Otherwise, %NULL is returned.
+ * @fgp_flags can be:
+ *
+ * - FGP_ACCESSED: the page will be marked accessed
+ * - FGP_LOCK: Page is return locked
+ * - FGP_CREAT: If page is not present then a new page is allocated using
+ * @gfp_mask and added to the page cache and the VM's LRU
+ * list. The page is returned locked and with an increased
+ * refcount. Otherwise, NULL is returned.
*
* If FGP_LOCK or FGP_CREAT are specified then the function may sleep even
* if the GFP flags specified for FGP_CREAT are atomic.
iocb->ki_pos += retval;
count -= retval;
}
- iov_iter_revert(iter, iov_iter_count(iter) - count);
+ iov_iter_revert(iter, count - iov_iter_count(iter));
/*
* Btrfs can have a short DIO read if we encounter
struct file_ra_state *ra = &file->f_ra;
struct inode *inode = mapping->host;
pgoff_t offset = vmf->pgoff;
+ pgoff_t max_off;
struct page *page;
- loff_t size;
int ret = 0;
- size = round_up(i_size_read(inode), PAGE_SIZE);
- if (offset >= size >> PAGE_SHIFT)
+ max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+ if (unlikely(offset >= max_off))
return VM_FAULT_SIGBUS;
/*
* Found the page and have a reference on it.
* We must recheck i_size under page lock.
*/
- size = round_up(i_size_read(inode), PAGE_SIZE);
- if (unlikely(offset >= size >> PAGE_SHIFT)) {
+ max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+ if (unlikely(offset >= max_off)) {
unlock_page(page);
put_page(page);
return VM_FAULT_SIGBUS;
struct file *file = vmf->vma->vm_file;
struct address_space *mapping = file->f_mapping;
pgoff_t last_pgoff = start_pgoff;
- loff_t size;
+ unsigned long max_idx;
struct page *head, *page;
rcu_read_lock();
if (page->mapping != mapping || !PageUptodate(page))
goto unlock;
- size = round_up(i_size_read(mapping->host), PAGE_SIZE);
- if (page->index >= size >> PAGE_SHIFT)
+ max_idx = DIV_ROUND_UP(i_size_read(mapping->host), PAGE_SIZE);
+ if (page->index >= max_idx)
goto unlock;
if (file->f_ra.mmap_miss > 0)
* about to write. We do this *before* the write so that we can return
* without clobbering -EIOCBQUEUED from ->direct_IO().
*/
- if (mapping->nrpages) {
- written = invalidate_inode_pages2_range(mapping,
+ written = invalidate_inode_pages2_range(mapping,
pos >> PAGE_SHIFT, end);
- /*
- * If a page can not be invalidated, return 0 to fall back
- * to buffered write.
- */
- if (written) {
- if (written == -EBUSY)
- return 0;
- goto out;
- }
+ /*
+ * If a page can not be invalidated, return 0 to fall back
+ * to buffered write.
+ */
+ if (written) {
+ if (written == -EBUSY)
+ return 0;
+ goto out;
}
written = mapping->a_ops->direct_IO(iocb, from);
* so we don't support it 100%. If this invalidation
* fails, tough, the write still worked...
*/
- if (mapping->nrpages) {
- invalidate_inode_pages2_range(mapping,
- pos >> PAGE_SHIFT, end);
- }
+ invalidate_inode_pages2_range(mapping,
+ pos >> PAGE_SHIFT, end);
if (written > 0) {
pos += written;
ssize_t written = 0;
unsigned int flags = 0;
- /*
- * Copies from kernel address space cannot fail (NFSD is a big user).
- */
- if (!iter_is_iovec(i))
- flags |= AOP_FLAG_UNINTERRUPTIBLE;
-
do {
struct page *page;
unsigned long offset; /* Offset into pagecache page */
* @gfp_mask: memory allocation flags (and I/O mode)
*
* The address_space is to try to release any data against the page
- * (presumably at page->private). If the release was successful, return `1'.
+ * (presumably at page->private). If the release was successful, return '1'.
* Otherwise return zero.
*
* This may also be called if PG_fscache is set on a page, indicating that the
projects / karo-tx-linux.git / commitdiff