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Commit 362eca70 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: fix inline data updates with checksums enabled 

The inline data code was updating the raw inode directly; this is
problematic since if metadata checksums are enabled,
ext4_mark_inode_dirty() must be called to update the inode's checksum.
In addition, the jbd2 layer requires that get_write_access() be called
before the metadata buffer is modified.  Fix both of these problems.

https://bugzilla.kernel.org/show_bug.cgi?id=200443



Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
parent 2dca60d9

fs/ext4/inline.c

+11 −8
Original line number Diff line number Diff line
@@ -682,6 +682,10 @@ int ext4_try_to_write_inline_data(struct address_space *mapping, 
		goto convert;

	}



	ret = ext4_journal_get_write_access(handle, iloc.bh);

	if (ret)

		goto out;



	flags |= AOP_FLAG_NOFS;



	page = grab_cache_page_write_begin(mapping, 0, flags);
@@ -710,7 +714,7 @@ int ext4_try_to_write_inline_data(struct address_space *mapping, 
out_up_read:

	up_read(&EXT4_I(inode)->xattr_sem);

out:

	if (handle)

	if (handle && (ret != 1))

		ext4_journal_stop(handle);

	brelse(iloc.bh);

	return ret;
@@ -752,6 +756,7 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 


	ext4_write_unlock_xattr(inode, &no_expand);

	brelse(iloc.bh);

	mark_inode_dirty(inode);

out:

	return copied;

}
@@ -898,7 +903,6 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping, 
		goto out;

	}





	page = grab_cache_page_write_begin(mapping, 0, flags);

	if (!page) {

		ret = -ENOMEM;
@@ -916,6 +920,9 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping, 
		if (ret < 0)

			goto out_release_page;

	}

	ret = ext4_journal_get_write_access(handle, iloc.bh);

	if (ret)

		goto out_release_page;



	up_read(&EXT4_I(inode)->xattr_sem);

	*pagep = page;
@@ -936,7 +943,6 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 
				  unsigned len, unsigned copied,

				  struct page *page)

{

	int i_size_changed = 0;

	int ret;



	ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
@@ -954,10 +960,8 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 
	 * But it's important to update i_size while still holding page lock:

	 * page writeout could otherwise come in and zero beyond i_size.

	 */

	if (pos+copied > inode->i_size) {

	if (pos+copied > inode->i_size)

		i_size_write(inode, pos+copied);

		i_size_changed = 1;

	}

	unlock_page(page);

	put_page(page);
@@ -967,7 +971,6 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 
	 * ordering of page lock and transaction start for journaling

	 * filesystems.

	 */

	if (i_size_changed)

	mark_inode_dirty(inode);



	return copied;

fs/ext4/inode.c

+7 −9
Original line number Diff line number Diff line
@@ -1389,9 +1389,10 @@ static int ext4_write_end(struct file *file, 
	loff_t old_size = inode->i_size;

	int ret = 0, ret2;

	int i_size_changed = 0;

	int inline_data = ext4_has_inline_data(inode);



	trace_ext4_write_end(inode, pos, len, copied);

	if (ext4_has_inline_data(inode)) {

	if (inline_data) {

		ret = ext4_write_inline_data_end(inode, pos, len,

						 copied, page);

		if (ret < 0) {
@@ -1419,7 +1420,7 @@ static int ext4_write_end(struct file *file, 
	 * ordering of page lock and transaction start for journaling

	 * filesystems.

	 */

	if (i_size_changed)

	if (i_size_changed || inline_data)

		ext4_mark_inode_dirty(handle, inode);



	if (pos + len > inode->i_size && ext4_can_truncate(inode))
@@ -1493,6 +1494,7 @@ static int ext4_journalled_write_end(struct file *file, 
	int partial = 0;

	unsigned from, to;

	int size_changed = 0;

	int inline_data = ext4_has_inline_data(inode);



	trace_ext4_journalled_write_end(inode, pos, len, copied);

	from = pos & (PAGE_SIZE - 1);
@@ -1500,7 +1502,7 @@ static int ext4_journalled_write_end(struct file *file, 


	BUG_ON(!ext4_handle_valid(handle));



	if (ext4_has_inline_data(inode)) {

	if (inline_data) {

		ret = ext4_write_inline_data_end(inode, pos, len,

						 copied, page);

		if (ret < 0) {
@@ -1531,7 +1533,7 @@ static int ext4_journalled_write_end(struct file *file, 
	if (old_size < pos)

		pagecache_isize_extended(inode, old_size, pos);



	if (size_changed) {

	if (size_changed || inline_data) {

		ret2 = ext4_mark_inode_dirty(handle, inode);

		if (!ret)

			ret = ret2;
@@ -2028,11 +2030,7 @@ static int __ext4_journalled_writepage(struct page *page, 
	}



	if (inline_data) {

		BUFFER_TRACE(inode_bh, "get write access");

		ret = ext4_journal_get_write_access(handle, inode_bh);



		err = ext4_handle_dirty_metadata(handle, inode, inode_bh);



		ret = ext4_mark_inode_dirty(handle, inode);

	} else {

		ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,

					     do_journal_get_write_access);