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Subject[PATCH v2 07/12] mm: Add an 'end' parameter to pagevec_lookup_entries
Date
Simplifies the callers and uses the existing functionality
in find_get_entries(). We can also drop the final argument of
truncate_exceptional_pvec_entries() and simplify the logic in that
function.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/pagevec.h | 5 ++---
mm/swap.c | 8 ++++----
mm/truncate.c | 41 ++++++++++-------------------------------
3 files changed, 16 insertions(+), 38 deletions(-)

diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index 081d934eda64..4b245592262c 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -26,9 +26,8 @@ struct pagevec {
void __pagevec_release(struct pagevec *pvec);
void __pagevec_lru_add(struct pagevec *pvec);
unsigned pagevec_lookup_entries(struct pagevec *pvec,
- struct address_space *mapping,
- pgoff_t start, unsigned nr_entries,
- pgoff_t *indices);
+ struct address_space *mapping, pgoff_t start, pgoff_t end,
+ unsigned nr_entries, pgoff_t *indices);
void pagevec_remove_exceptionals(struct pagevec *pvec);
unsigned pagevec_lookup_range(struct pagevec *pvec,
struct address_space *mapping,
diff --git a/mm/swap.c b/mm/swap.c
index fcf6ccb94b09..b6e56a84b466 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1036,6 +1036,7 @@ void __pagevec_lru_add(struct pagevec *pvec)
* @pvec: Where the resulting entries are placed
* @mapping: The address_space to search
* @start: The starting entry index
+ * @end: The highest index to return (inclusive).
* @nr_entries: The maximum number of pages
* @indices: The cache indices corresponding to the entries in @pvec
*
@@ -1056,11 +1057,10 @@ void __pagevec_lru_add(struct pagevec *pvec)
* found.
*/
unsigned pagevec_lookup_entries(struct pagevec *pvec,
- struct address_space *mapping,
- pgoff_t start, unsigned nr_entries,
- pgoff_t *indices)
+ struct address_space *mapping, pgoff_t start, pgoff_t end,
+ unsigned nr_entries, pgoff_t *indices)
{
- pvec->nr = find_get_entries(mapping, start, ULONG_MAX, nr_entries,
+ pvec->nr = find_get_entries(mapping, start, end, nr_entries,
pvec->pages, indices);
return pagevec_count(pvec);
}
diff --git a/mm/truncate.c b/mm/truncate.c
index 5dbe0c77b5ac..69ea72e7fc1c 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -57,11 +57,10 @@ static void clear_shadow_entry(struct address_space *mapping, pgoff_t index,
* exceptional entries similar to what pagevec_remove_exceptionals does.
*/
static void truncate_exceptional_pvec_entries(struct address_space *mapping,
- struct pagevec *pvec, pgoff_t *indices,
- pgoff_t end)
+ struct pagevec *pvec, pgoff_t *indices)
{
int i, j;
- bool dax, lock;
+ bool dax;

/* Handled by shmem itself */
if (shmem_mapping(mapping))
@@ -75,8 +74,7 @@ static void truncate_exceptional_pvec_entries(struct address_space *mapping,
return;

dax = dax_mapping(mapping);
- lock = !dax && indices[j] < end;
- if (lock)
+ if (!dax)
xa_lock_irq(&mapping->i_pages);

for (i = j; i < pagevec_count(pvec); i++) {
@@ -88,9 +86,6 @@ static void truncate_exceptional_pvec_entries(struct address_space *mapping,
continue;
}

- if (index >= end)
- continue;
-
if (unlikely(dax)) {
dax_delete_mapping_entry(mapping, index);
continue;
@@ -99,7 +94,7 @@ static void truncate_exceptional_pvec_entries(struct address_space *mapping,
__clear_shadow_entry(mapping, index, page);
}

- if (lock)
+ if (!dax)
xa_unlock_irq(&mapping->i_pages);
pvec->nr = j;
}
@@ -329,7 +324,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
while (index < end && find_lock_entries(mapping, index, end - 1,
&pvec, indices)) {
index = indices[pagevec_count(&pvec) - 1] + 1;
- truncate_exceptional_pvec_entries(mapping, &pvec, indices, end);
+ truncate_exceptional_pvec_entries(mapping, &pvec, indices);
for (i = 0; i < pagevec_count(&pvec); i++)
truncate_cleanup_page(mapping, pvec.pages[i]);
delete_from_page_cache_batch(mapping, &pvec);
@@ -381,8 +376,8 @@ void truncate_inode_pages_range(struct address_space *mapping,
index = start;
for ( ; ; ) {
cond_resched();
- if (!pagevec_lookup_entries(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE), indices)) {
+ if (!pagevec_lookup_entries(&pvec, mapping, index, end - 1,
+ PAGEVEC_SIZE, indices)) {
/* If all gone from start onwards, we're done */
if (index == start)
break;
@@ -390,23 +385,12 @@ void truncate_inode_pages_range(struct address_space *mapping,
index = start;
continue;
}
- if (index == start && indices[0] >= end) {
- /* All gone out of hole to be punched, we're done */
- pagevec_remove_exceptionals(&pvec);
- pagevec_release(&pvec);
- break;
- }

for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];

/* We rely upon deletion not changing page->index */
index = indices[i];
- if (index >= end) {
- /* Restart punch to make sure all gone */
- index = start - 1;
- break;
- }

if (xa_is_value(page))
continue;
@@ -417,7 +401,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
truncate_inode_page(mapping, page);
unlock_page(page);
}
- truncate_exceptional_pvec_entries(mapping, &pvec, indices, end);
+ truncate_exceptional_pvec_entries(mapping, &pvec, indices);
pagevec_release(&pvec);
index++;
}
@@ -528,8 +512,6 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,

/* We rely upon deletion not changing page->index */
index = indices[i];
- if (index > end)
- break;

if (xa_is_value(page)) {
invalidate_exceptional_entry(mapping, index,
@@ -629,16 +611,13 @@ int invalidate_inode_pages2_range(struct address_space *mapping,

pagevec_init(&pvec);
index = start;
- while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
- indices)) {
+ while (pagevec_lookup_entries(&pvec, mapping, index, end,
+ PAGEVEC_SIZE, indices)) {
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];

/* We rely upon deletion not changing page->index */
index = indices[i];
- if (index > end)
- break;

if (xa_is_value(page)) {
if (!invalidate_exceptional_entry2(mapping,
--
2.28.0
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