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SubjectRe: [PATCH v2 1/4] mm: consolidate dax / non-dax checks for writeback
On Wed 26-07-17 13:55:35, Jeff Layton wrote:
> From: Jeff Layton <jlayton@redhat.com>
>
> We have this complex conditional copied to several places. Turn it into
> a helper function.
>
> Signed-off-by: Jeff Layton <jlayton@redhat.com>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> mm/filemap.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index e1cca770688f..72e46e6f0d9a 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -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() */
> --
> 2.13.3
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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