diff options
Diffstat (limited to 'drivers/nvdimm/pmem.c')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 0279eb1da3ef..28cb44c61d4a 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -1,18 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Persistent Memory Driver * * Copyright (c) 2014-2015, Intel Corporation. * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>. * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. */ #include <asm/cacheflush.h> @@ -281,20 +273,27 @@ static long pmem_dax_direct_access(struct dax_device *dax_dev, return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn); } +/* + * Use the 'no check' versions of copy_from_iter_flushcache() and + * copy_to_iter_mcsafe() to bypass HARDENED_USERCOPY overhead. Bounds + * checking, both file offset and device offset, is handled by + * dax_iomap_actor() + */ static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { - return copy_from_iter_flushcache(addr, bytes, i); + return _copy_from_iter_flushcache(addr, bytes, i); } static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { - return copy_to_iter_mcsafe(addr, bytes, i); + return _copy_to_iter_mcsafe(addr, bytes, i); } static const struct dax_operations pmem_dax_ops = { .direct_access = pmem_dax_direct_access, + .dax_supported = generic_fsdax_supported, .copy_from_iter = pmem_copy_from_iter, .copy_to_iter = pmem_copy_to_iter, }; |