Re: [PATCH v4 4/5] dax: remove DAX code from page_cache_tree_insert()

Jan Kara
2017-07-24T11:47:43Z

On Fri 21-07-17 16:39:54, Ross Zwisler wrote:
> Now that we no longer insert struct page pointers in DAX radix trees we can
> remove the special casing for DAX in page_cache_tree_insert(). This also
> allows us to make dax_wake_mapping_entry_waiter() local to fs/dax.c,
> removing it from dax.h.
>
> Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
> Suggested-by: Jan Kara <jack@suse.cz>

Looks good. You can add:

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

Honza

> ---
> fs/dax.c | 2 +-
> include/linux/dax.h | 2 --
> mm/filemap.c | 13 ++-----------
> 3 files changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index fb0e4c1..0e27d90 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -127,7 +127,7 @@ static int wake_exceptional_entry_func(wait_queue_entry_t *wait, unsigned int mo
> * correct waitqueue where tasks might be waiting for that old 'entry' and
> * wake them.
> */
> -void dax_wake_mapping_entry_waiter(struct address_space *mapping,
> +static void dax_wake_mapping_entry_waiter(struct address_space *mapping,
> pgoff_t index, void *entry, bool wake_all)
> {
> struct exceptional_entry_key key;
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index 29cced8..afa99bb 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -122,8 +122,6 @@ int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
> int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
> int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
> pgoff_t index);
> -void dax_wake_mapping_entry_waiter(struct address_space *mapping,
> - pgoff_t index, void *entry, bool wake_all);
>
> #ifdef CONFIG_FS_DAX
> int __dax_zero_page_range(struct block_device *bdev,
> diff --git a/mm/filemap.c b/mm/filemap.c
> index a497024..1bf1265 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -130,17 +130,8 @@ static int page_cache_tree_insert(struct address_space *mapping,
> return -EEXIST;
>
> mapping->nrexceptional--;
> - if (!dax_mapping(mapping)) {
> - if (shadowp)
> - *shadowp = p;
> - } else {
> - /* DAX can replace empty locked entry with a hole */
> - WARN_ON_ONCE(p !=
> - dax_radix_locked_entry(0, RADIX_DAX_EMPTY));
> - /* Wakeup waiters for exceptional entry lock */
> - dax_wake_mapping_entry_waiter(mapping, page->index, p,
> - true);
> - }
> + if (shadowp)
> + *shadowp = p;
> }
> __radix_tree_replace(&mapping->page_tree, node, slot, page,
> workingset_update_node, mapping);
> --
> 2.9.4
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR