[PATCH v4 10/10] fs/dax: Remove useless functions

Shiyang Ruan
2021-06-04T01:20:01Z

Since owner tracking is triggerred by pmem device, these functions are
useless. So remove them.

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
fs/dax.c | 46 ----------------------------------------------
1 file changed, 46 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 1a7473f46df2..aff1e0f58967 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -334,48 +334,6 @@ static unsigned long dax_end_pfn(void *entry)
for (pfn = dax_to_pfn(entry); \
pfn < dax_end_pfn(entry); pfn++)

-/*
- * TODO: for reflink+dax we need a way to associate a single page with
- * multiple address_space instances at different linear_page_index()
- * offsets.
- */
-static void dax_associate_entry(void *entry, struct address_space *mapping,
- struct vm_area_struct *vma, unsigned long address)
-{
- unsigned long size = dax_entry_size(entry), pfn, index;
- int i = 0;
-
- if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
- return;
-
- index = linear_page_index(vma, address & ~(size - 1));
- for_each_mapped_pfn(entry, pfn) {
- struct page *page = pfn_to_page(pfn);
-
- WARN_ON_ONCE(page->mapping);
- page->mapping = mapping;
- page->index = index + i++;
- }
-}
-
-static void dax_disassociate_entry(void *entry, struct address_space *mapping,
- bool trunc)
-{
- unsigned long pfn;
-
- if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
- return;
-
- for_each_mapped_pfn(entry, pfn) {
- struct page *page = pfn_to_page(pfn);
-
- WARN_ON_ONCE(trunc && page_ref_count(page) > 1);
- WARN_ON_ONCE(page->mapping && page->mapping != mapping);
- page->mapping = NULL;
- page->index = 0;
- }
-}
-
static struct page *dax_busy_page(void *entry)
{
unsigned long pfn;
@@ -554,7 +512,6 @@ static void *grab_mapping_entry(struct xa_state *xas,
xas_lock_irq(xas);
}

- dax_disassociate_entry(entry, mapping, false);
xas_store(xas, NULL); /* undo the PMD join */
dax_wake_entry(xas, entry, WAKE_ALL);
mapping->nrpages -= PG_PMD_NR;
@@ -691,7 +648,6 @@ static int __dax_invalidate_entry(struct address_space *mapping,
(xas_get_mark(&xas, PAGECACHE_TAG_DIRTY) ||
xas_get_mark(&xas, PAGECACHE_TAG_TOWRITE)))
goto out;
- dax_disassociate_entry(entry, mapping, trunc);
xas_store(&xas, NULL);
mapping->nrpages -= 1UL << dax_entry_order(entry);
ret = 1;
@@ -785,8 +741,6 @@ static void *dax_insert_entry(struct xa_state *xas,
if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
void *old;

- dax_disassociate_entry(entry, mapping, false);
- dax_associate_entry(new_entry, mapping, vmf->vma, vmf->address);
/*
* Only swap our new entry into the page cache if the current
* entry is a zero page or an empty entry. If a normal PTE or
--
2.31.1