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Message-Id: <20210128070404.1922318-25-willy@infradead.org>
Date: Thu, 28 Jan 2021 07:04:03 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 24/25] mm/filemap: Convert page wait queues to be folios
Reinforce that if we're waiting for a bit in a struct page, that's
actually in the head page by changing the type from page to folio.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/linux/pagemap.h | 6 +++---
mm/filemap.c | 40 +++++++++++++++++++++-------------------
2 files changed, 24 insertions(+), 22 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index f59af1547e7b..f0a601f6d68c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -594,13 +594,13 @@ static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
/* This has the same layout as wait_bit_key - see fs/cachefiles/rdwr.c */
struct wait_page_key {
- struct page *page;
+ struct folio *folio;
int bit_nr;
int page_match;
};
struct wait_page_queue {
- struct page *page;
+ struct folio *folio;
int bit_nr;
wait_queue_entry_t wait;
};
@@ -608,7 +608,7 @@ struct wait_page_queue {
static inline bool wake_page_match(struct wait_page_queue *wait_page,
struct wait_page_key *key)
{
- if (wait_page->page != key->page)
+ if (wait_page->folio != key->folio)
return false;
key->page_match = 1;
diff --git a/mm/filemap.c b/mm/filemap.c
index a00030b2ef71..ff61f1f2ce2c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -991,11 +991,11 @@ EXPORT_SYMBOL(__page_cache_alloc);
*/
#define PAGE_WAIT_TABLE_BITS 8
#define PAGE_WAIT_TABLE_SIZE (1 << PAGE_WAIT_TABLE_BITS)
-static wait_queue_head_t page_wait_table[PAGE_WAIT_TABLE_SIZE] __cacheline_aligned;
+static wait_queue_head_t folio_wait_table[PAGE_WAIT_TABLE_SIZE] __cacheline_aligned;
-static wait_queue_head_t *page_waitqueue(struct page *page)
+static wait_queue_head_t *folio_waitqueue(struct folio *folio)
{
- return &page_wait_table[hash_ptr(page, PAGE_WAIT_TABLE_BITS)];
+ return &folio_wait_table[hash_ptr(folio, PAGE_WAIT_TABLE_BITS)];
}
void __init pagecache_init(void)
@@ -1003,7 +1003,7 @@ void __init pagecache_init(void)
int i;
for (i = 0; i < PAGE_WAIT_TABLE_SIZE; i++)
- init_waitqueue_head(&page_wait_table[i]);
+ init_waitqueue_head(&folio_wait_table[i]);
page_writeback_init();
}
@@ -1058,10 +1058,11 @@ static int wake_page_function(wait_queue_entry_t *wait, unsigned mode, int sync,
*/
flags = wait->flags;
if (flags & WQ_FLAG_EXCLUSIVE) {
- if (test_bit(key->bit_nr, &key->page->flags))
+ if (test_bit(key->bit_nr, &key->folio->page.flags))
return -1;
if (flags & WQ_FLAG_CUSTOM) {
- if (test_and_set_bit(key->bit_nr, &key->page->flags))
+ if (test_and_set_bit(key->bit_nr,
+ &key->folio->page.flags))
return -1;
flags |= WQ_FLAG_DONE;
}
@@ -1095,12 +1096,12 @@ static int wake_page_function(wait_queue_entry_t *wait, unsigned mode, int sync,
static void wake_up_folio_bit(struct folio *folio, int bit_nr)
{
- wait_queue_head_t *q = page_waitqueue(&folio->page);
+ wait_queue_head_t *q = folio_waitqueue(folio);
struct wait_page_key key;
unsigned long flags;
wait_queue_entry_t bookmark;
- key.page = &folio->page;
+ key.folio = folio;
key.bit_nr = bit_nr;
key.page_match = 0;
@@ -1192,7 +1193,7 @@ int sysctl_page_lock_unfairness = 5;
static inline int wait_on_folio_bit_common(struct folio *folio, int bit_nr,
int state, enum behavior behavior)
{
- wait_queue_head_t *q = page_waitqueue(&folio->page);
+ wait_queue_head_t *q = folio_waitqueue(folio);
int unfairness = sysctl_page_lock_unfairness;
struct wait_page_queue wait_page;
wait_queue_entry_t *wait = &wait_page.wait;
@@ -1212,7 +1213,7 @@ static inline int wait_on_folio_bit_common(struct folio *folio, int bit_nr,
init_wait(wait);
wait->func = wake_page_function;
- wait_page.page = &folio->page;
+ wait_page.folio = folio;
wait_page.bit_nr = bit_nr;
repeat:
@@ -1356,7 +1357,7 @@ EXPORT_SYMBOL(wait_on_folio_bit_killable);
*/
int put_and_wait_on_page_locked(struct page *page, int state)
{
- wait_on_folio_bit_common(page_folio(page), PG_locked,
+ return wait_on_folio_bit_common(page_folio(page), PG_locked,
state, DROP);
}
@@ -1369,12 +1370,13 @@ int put_and_wait_on_page_locked(struct page *page, int state)
*/
void add_page_wait_queue(struct page *page, wait_queue_entry_t *waiter)
{
- wait_queue_head_t *q = page_waitqueue(page);
+ struct folio *folio = page_folio(page);
+ wait_queue_head_t *q = folio_waitqueue(folio);
unsigned long flags;
spin_lock_irqsave(&q->lock, flags);
__add_wait_queue_entry_tail(q, waiter);
- SetPageWaiters(page);
+ SetFolioWaiters(folio);
spin_unlock_irqrestore(&q->lock, flags);
}
EXPORT_SYMBOL_GPL(add_page_wait_queue);
@@ -1431,10 +1433,10 @@ EXPORT_SYMBOL(unlock_folio);
*/
void unlock_page_fscache(struct page *page)
{
- page = compound_head(page);
- VM_BUG_ON_PAGE(!PagePrivate2(page), page);
- clear_bit_unlock(PG_fscache, &page->flags);
- wake_up_page_bit(page, PG_fscache);
+ struct folio *folio = page_folio(page);
+ VM_BUG_ON_FOLIO(!FolioPrivate2(folio), folio);
+ clear_bit_unlock(PG_fscache, &folio->page.flags);
+ wake_up_folio_bit(folio, PG_fscache);
}
EXPORT_SYMBOL(unlock_page_fscache);
@@ -1520,10 +1522,10 @@ EXPORT_SYMBOL_GPL(__lock_folio_killable);
int __lock_folio_async(struct folio *folio, struct wait_page_queue *wait)
{
- struct wait_queue_head *q = page_waitqueue(&folio->page);
+ struct wait_queue_head *q = folio_waitqueue(folio);
int ret = 0;
- wait->page = &folio->page;
+ wait->folio = folio;
wait->bit_nr = PG_locked;
spin_lock_irq(&q->lock);
--
2.29.2
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