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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: Jan Kara <jack@suse.cz>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton 2017-07-26 10:21:11 -04:00
parent 80aafd50b6
commit 9326c9b20d
1 changed files with 9 additions and 6 deletions
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15
mm/filemap.c
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@ -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() */