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Commit 9326c9b2 authored by Jeff Layton's avatar Jeff Layton
Browse files

mm: consolidate dax / non-dax checks for writeback 



We have this complex conditional copied to several places. Turn it into
a helper function.

Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
parent 80aafd50

mm/filemap.c

+9 −6
Original line number Diff line number Diff line
@@ -522,12 +522,17 @@ int filemap_fdatawait(struct address_space *mapping) 
}

EXPORT_SYMBOL(filemap_fdatawait);



static bool mapping_needs_writeback(struct address_space *mapping)

{

	return (!dax_mapping(mapping) && mapping->nrpages) ||

	    (dax_mapping(mapping) && mapping->nrexceptional);

}



int filemap_write_and_wait(struct address_space *mapping)

{

	int err = 0;



	if ((!dax_mapping(mapping) && mapping->nrpages) ||

	    (dax_mapping(mapping) && mapping->nrexceptional)) {

	if (mapping_needs_writeback(mapping)) {

		err = filemap_fdatawrite(mapping);

		/*

		 * Even if the above returned error, the pages may be
@@ -566,8 +571,7 @@ int filemap_write_and_wait_range(struct address_space *mapping, 
{

	int err = 0;



	if ((!dax_mapping(mapping) && mapping->nrpages) ||

	    (dax_mapping(mapping) && mapping->nrexceptional)) {

	if (mapping_needs_writeback(mapping)) {

		err = __filemap_fdatawrite_range(mapping, lstart, lend,

						 WB_SYNC_ALL);

		/* See comment of filemap_write_and_wait() */
@@ -656,8 +660,7 @@ int file_write_and_wait_range(struct file *file, loff_t lstart, loff_t lend) 
	int err = 0, err2;

	struct address_space *mapping = file->f_mapping;



	if ((!dax_mapping(mapping) && mapping->nrpages) ||

	    (dax_mapping(mapping) && mapping->nrexceptional)) {

	if (mapping_needs_writeback(mapping)) {

		err = __filemap_fdatawrite_range(mapping, lstart, lend,

						 WB_SYNC_ALL);

		/* See comment of filemap_write_and_wait() */