[PATCHv1, RFC 23/33] fs: make block_page_mkwrite() aware about huge pages
From: Kirill A. Shutemov <hidden>
Date: 2016-07-26 00:35:25
Also in:
linux-block, linux-ext4, linux-fsdevel, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
Adjust check on whether part of the page beyond file size and apply compound_head() and page_mapping() where appropriate. Signed-off-by: Kirill A. Shutemov <redacted> --- fs/buffer.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index edd0971f9f95..2e25d0e7a233 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c@@ -2502,7 +2502,7 @@ EXPORT_SYMBOL(block_commit_write); int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, get_block_t get_block) { - struct page *page = vmf->page; + struct page *page = compound_head(vmf->page); struct inode *inode = file_inode(vma->vm_file); unsigned long end; loff_t size;
@@ -2510,7 +2510,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, lock_page(page); size = i_size_read(inode); - if ((page->mapping != inode->i_mapping) || + if ((page_mapping(page) != inode->i_mapping) || (page_offset(page) > size)) { /* We overload EFAULT to mean page got truncated */ ret = -EFAULT;
@@ -2518,10 +2518,10 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, } /* page is wholly or partially inside EOF */ - if (((page->index + 1) << PAGE_SHIFT) > size) - end = size & ~PAGE_MASK; + if (((page->index + hpage_nr_pages(page)) << PAGE_SHIFT) > size) + end = size & ~hpage_mask(page); else - end = PAGE_SIZE; + end = hpage_size(page); ret = __block_write_begin(page, 0, end, get_block); if (!ret)
--
2.8.1
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