fs: add iomap_file_dirty (5f4e5752) · Commits · 戴 / test

fs/iomap.c

+82 −0

Original line number	Diff line number	Diff line
		@@ -252,6 +252,88 @@ iomap_file_buffered_write(struct kiocb iocb, struct iov_iter iter,
		}
		EXPORT_SYMBOL_GPL(iomap_file_buffered_write);

		static struct page *
		__iomap_read_page(struct inode *inode, loff_t offset)
		{
		struct address_space *mapping = inode->i_mapping;
		struct page *page;

		page = read_mapping_page(mapping, offset >> PAGE_SHIFT, NULL);
		if (IS_ERR(page))
		return page;
		if (!PageUptodate(page)) {
		put_page(page);
		return ERR_PTR(-EIO);
		}
		return page;
		}

		static loff_t
		iomap_dirty_actor(struct inode inode, loff_t pos, loff_t length, void data,
		struct iomap *iomap)
		{
		long status = 0;
		ssize_t written = 0;

		do {
		struct page page, rpage;
		unsigned long offset; /* Offset into pagecache page */
		unsigned long bytes; /* Bytes to write to page */

		offset = (pos & (PAGE_SIZE - 1));
		bytes = min_t(unsigned long, PAGE_SIZE - offset, length);

		rpage = __iomap_read_page(inode, pos);
		if (IS_ERR(rpage))
		return PTR_ERR(rpage);

		status = iomap_write_begin(inode, pos, bytes,
		AOP_FLAG_NOFS \| AOP_FLAG_UNINTERRUPTIBLE,
		&page, iomap);
		put_page(rpage);
		if (unlikely(status))
		return status;

		WARN_ON_ONCE(!PageUptodate(page));

		status = iomap_write_end(inode, pos, bytes, bytes, page);
		if (unlikely(status <= 0)) {
		if (WARN_ON_ONCE(status == 0))
		return -EIO;
		return status;
		}

		cond_resched();

		pos += status;
		written += status;
		length -= status;

		balance_dirty_pages_ratelimited(inode->i_mapping);
		} while (length);

		return written;
		}

		int
		iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
		struct iomap_ops *ops)
		{
		loff_t ret;

		while (len) {
		ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
		iomap_dirty_actor);
		if (ret <= 0)
		return ret;
		pos += ret;
		len -= ret;
		}

		return 0;
		}
		EXPORT_SYMBOL_GPL(iomap_file_dirty);

		static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
		unsigned bytes, struct iomap *iomap)
		{

include/linux/iomap.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -64,6 +64,8 @@ struct iomap_ops {

		ssize_t iomap_file_buffered_write(struct kiocb iocb, struct iov_iter from,
		struct iomap_ops *ops);
		int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
		struct iomap_ops *ops);
		int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
		bool did_zero, struct iomap_ops ops);
		int iomap_truncate_page(struct inode inode, loff_t pos, bool did_zero,

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