[PATCH 06/35] mm: Make pagevec_lookup() update index
Jan Kara
jack at suse.cz
Thu Jun 1 02:32:16 PDT 2017
Make pagevec_lookup() (and underlying find_get_pages()) update index to
the next page where iteration should continue. Most callers want this
and also pagevec_lookup_tag() already does this.
Signed-off-by: Jan Kara <jack at suse.cz>
---
fs/buffer.c | 6 ++----
fs/ext4/file.c | 4 +---
fs/ext4/inode.c | 8 ++------
fs/fscache/page.c | 5 ++---
fs/hugetlbfs/inode.c | 17 ++++++++---------
fs/nilfs2/page.c | 3 +--
fs/ramfs/file-nommu.c | 2 +-
fs/xfs/xfs_file.c | 3 +--
include/linux/pagemap.h | 2 +-
include/linux/pagevec.h | 2 +-
mm/filemap.c | 9 +++++++--
mm/swap.c | 5 +++--
12 files changed, 30 insertions(+), 36 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 161be58c5cb0..fe0ee01c5a44 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1638,13 +1638,12 @@ void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t len)
end = (block + len - 1) >> (PAGE_SHIFT - bd_inode->i_blkbits);
pagevec_init(&pvec, 0);
- while (index <= end && pagevec_lookup(&pvec, bd_mapping, index,
+ while (index <= end && pagevec_lookup(&pvec, bd_mapping, &index,
min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
- index = page->index;
- if (index > end)
+ if (page->index > end)
break;
if (!page_has_buffers(page))
continue;
@@ -1675,7 +1674,6 @@ void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t len)
}
pagevec_release(&pvec);
cond_resched();
- index++;
}
}
EXPORT_SYMBOL(clean_bdev_aliases);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 2b00bf84c05b..ddca17c7875a 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -482,7 +482,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
unsigned long nr_pages;
num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
- nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
+ nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &index,
(pgoff_t)num);
if (nr_pages == 0)
break;
@@ -547,8 +547,6 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
/* The no. of pages is less than our desired, we are done. */
if (nr_pages < num)
break;
-
- index = pvec.pages[i - 1]->index + 1;
pagevec_release(&pvec);
} while (index <= end);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1bd0bfa547f6..784f41328dc8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1670,7 +1670,7 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
pagevec_init(&pvec, 0);
while (index <= end) {
- nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
+ nr_pages = pagevec_lookup(&pvec, mapping, &index, PAGEVEC_SIZE);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
@@ -1687,7 +1687,6 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
}
unlock_page(page);
}
- index = pvec.pages[nr_pages - 1]->index + 1;
pagevec_release(&pvec);
}
}
@@ -2284,7 +2283,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
pagevec_init(&pvec, 0);
while (start <= end) {
- nr_pages = pagevec_lookup(&pvec, inode->i_mapping, start,
+ nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &start,
PAGEVEC_SIZE);
if (nr_pages == 0)
break;
@@ -2293,8 +2292,6 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
if (page->index > end)
break;
- /* Up to 'end' pages must be contiguous */
- BUG_ON(page->index != start);
bh = head = page_buffers(page);
do {
if (lblk < mpd->map.m_lblk)
@@ -2339,7 +2336,6 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
pagevec_release(&pvec);
return err;
}
- start++;
}
pagevec_release(&pvec);
}
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index c8c4f79c7ce1..83018861dcd2 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -1178,11 +1178,10 @@ void __fscache_uncache_all_inode_pages(struct fscache_cookie *cookie,
pagevec_init(&pvec, 0);
next = 0;
do {
- if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE))
+ if (!pagevec_lookup(&pvec, mapping, &next, PAGEVEC_SIZE))
break;
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
- next = page->index;
if (PageFsCache(page)) {
__fscache_wait_on_page_write(cookie, page);
__fscache_uncache_page(cookie, page);
@@ -1190,7 +1189,7 @@ void __fscache_uncache_all_inode_pages(struct fscache_cookie *cookie,
}
pagevec_release(&pvec);
cond_resched();
- } while (++next);
+ } while (next);
_leave("");
}
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index dde861387a40..372fc8aac38e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -401,7 +401,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
const pgoff_t end = lend >> huge_page_shift(h);
struct vm_area_struct pseudo_vma;
struct pagevec pvec;
- pgoff_t next;
+ pgoff_t next, index;
int i, freed = 0;
long lookup_nr = PAGEVEC_SIZE;
bool truncate_op = (lend == LLONG_MAX);
@@ -420,7 +420,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
/*
* When no more pages are found, we are done.
*/
- if (!pagevec_lookup(&pvec, mapping, next, lookup_nr))
+ if (!pagevec_lookup(&pvec, mapping, &next, lookup_nr))
break;
for (i = 0; i < pagevec_count(&pvec); ++i) {
@@ -432,13 +432,13 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
* only possible in the punch hole case as end is
* max page offset in the truncate case.
*/
- next = page->index;
- if (next >= end)
+ index = page->index;
+ if (index >= end)
break;
hash = hugetlb_fault_mutex_hash(h, current->mm,
&pseudo_vma,
- mapping, next, 0);
+ mapping, index, 0);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
/*
@@ -455,8 +455,8 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
i_mmap_lock_write(mapping);
hugetlb_vmdelete_list(&mapping->i_mmap,
- next * pages_per_huge_page(h),
- (next + 1) * pages_per_huge_page(h));
+ index * pages_per_huge_page(h),
+ (index + 1) * pages_per_huge_page(h));
i_mmap_unlock_write(mapping);
}
@@ -475,14 +475,13 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
freed++;
if (!truncate_op) {
if (unlikely(hugetlb_unreserve_pages(inode,
- next, next + 1, 1)))
+ index, index + 1, 1)))
hugetlb_fix_reserve_counts(inode);
}
unlock_page(page);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
}
- ++next;
huge_pagevec_release(&pvec);
cond_resched();
}
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index f11a3ad2df0c..382a36c72d72 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -312,10 +312,9 @@ void nilfs_copy_back_pages(struct address_space *dmap,
pagevec_init(&pvec, 0);
repeat:
- n = pagevec_lookup(&pvec, smap, index, PAGEVEC_SIZE);
+ n = pagevec_lookup(&pvec, smap, &index, PAGEVEC_SIZE);
if (!n)
return;
- index = pvec.pages[n - 1]->index + 1;
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i], *dpage;
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 2ef7ce75c062..3ac1f2387083 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -228,7 +228,7 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
if (!pages)
goto out_free;
- nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages);
+ nr = find_get_pages(inode->i_mapping, &pgoff, lpages, pages);
if (nr != lpages)
goto out_free_pages; /* leave if some pages were missing */
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 5fb5a0958a14..487342078fc7 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1050,7 +1050,7 @@ xfs_find_get_desired_pgoff(
unsigned int i;
want = min_t(pgoff_t, end - index, PAGEVEC_SIZE - 1) + 1;
- nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
+ nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &index,
want);
if (nr_pages == 0)
break;
@@ -1124,7 +1124,6 @@ xfs_find_get_desired_pgoff(
if (nr_pages < want)
break;
- index = pvec.pages[i - 1]->index + 1;
pagevec_release(&pvec);
} while (index <= end);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 316a19f6b635..86de6f9c8607 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -336,7 +336,7 @@ struct page *find_lock_entry(struct address_space *mapping, pgoff_t offset);
unsigned find_get_entries(struct address_space *mapping, pgoff_t start,
unsigned int nr_entries, struct page **entries,
pgoff_t *indices);
-unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
+unsigned find_get_pages(struct address_space *mapping, pgoff_t *start,
unsigned int nr_pages, struct page **pages);
unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
unsigned int nr_pages, struct page **pages);
diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index b45d391b4540..c395a5bb58b2 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -28,7 +28,7 @@ unsigned pagevec_lookup_entries(struct pagevec *pvec,
pgoff_t *indices);
void pagevec_remove_exceptionals(struct pagevec *pvec);
unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
- pgoff_t start, unsigned nr_pages);
+ pgoff_t *start, unsigned nr_pages);
unsigned pagevec_lookup_tag(struct pagevec *pvec,
struct address_space *mapping, pgoff_t *index, int tag,
unsigned nr_pages);
diff --git a/mm/filemap.c b/mm/filemap.c
index 6f1be573a5e6..10d926a423e2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1450,10 +1450,11 @@ unsigned find_get_entries(struct address_space *mapping,
*
* The search returns a group of mapping-contiguous pages with ascending
* indexes. There may be holes in the indices due to not-present pages.
+ * We also update @start to index the next page for the traversal.
*
* find_get_pages() returns the number of pages which were found.
*/
-unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
+unsigned find_get_pages(struct address_space *mapping, pgoff_t *start,
unsigned int nr_pages, struct page **pages)
{
struct radix_tree_iter iter;
@@ -1464,7 +1465,7 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
return 0;
rcu_read_lock();
- radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, *start) {
struct page *head, *page;
repeat:
page = radix_tree_deref_slot(slot);
@@ -1506,6 +1507,10 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
}
rcu_read_unlock();
+
+ if (ret)
+ *start = pages[ret - 1]->index + 1;
+
return ret;
}
diff --git a/mm/swap.c b/mm/swap.c
index 98d08b4579fa..368d627cf279 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -951,12 +951,13 @@ void pagevec_remove_exceptionals(struct pagevec *pvec)
* reference against the pages in @pvec.
*
* The search returns a group of mapping-contiguous pages with ascending
- * indexes. There may be holes in the indices due to not-present pages.
+ * indexes. There may be holes in the indices due to not-present pages. We
+ * also update @start to index the next page for the traversal.
*
* pagevec_lookup() returns the number of pages which were found.
*/
unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
- pgoff_t start, unsigned nr_pages)
+ pgoff_t *start, unsigned nr_pages)
{
pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages);
return pagevec_count(pvec);
--
2.12.3
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