From: "Kirill A. Shutemov" Subject: [PATCHv4 33/43] ext4: handle huge pages in ext4_page_mkwrite() Date: Tue, 25 Oct 2016 03:13:32 +0300 Message-ID: <20161025001342.76126-34-kirill.shutemov@linux.intel.com> References: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Dave Hansen , Vlastimil Babka , Matthew Wilcox , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara , Andrew Morton Return-path: In-Reply-To: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org Trivial: remove assumption on page size. Signed-off-by: Kirill A. Shutemov --- fs/ext4/inode.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index c36296fbaa23..5ceb72c7bac1 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5649,7 +5649,7 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) { - struct page *page = vmf->page; + struct page *page = compound_head(vmf->page); loff_t size; unsigned long len; int ret; @@ -5685,10 +5685,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) goto out; } - if (page->index == size >> PAGE_SHIFT) - len = size & ~PAGE_MASK; - else - len = PAGE_SIZE; + len = hpage_size(page); + if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT) + len = size & ~hpage_mask(page); + /* * Return if we have all the buffers mapped. This avoids the need to do * journal_start/journal_stop which can block and take a long time @@ -5719,7 +5719,8 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) ret = block_page_mkwrite(vma, vmf, get_block); if (!ret && ext4_should_journal_data(inode)) { if (ext4_walk_page_buffers(handle, page_buffers(page), 0, - PAGE_SIZE, NULL, do_journal_get_write_access)) { + hpage_size(page), NULL, + do_journal_get_write_access)) { unlock_page(page); ret = VM_FAULT_SIGBUS; ext4_journal_stop(handle); -- 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org