Retrieve a folio from the page cache instead of a page. Removes a
hidden call to compound_head(). Then be sure to call folio_put()
instead of put_page() to release it. That doesn't save any calls
to compound_head(), just moves them around.
Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
---
drivers/md/bcache/super.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 1efb768b2890..83c786a5cc47 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -168,14 +168,14 @@ static const char *read_super(struct cache_sb *sb, struct
block_device *bdev,
{
const char *err;
struct cache_sb_disk *s;
- struct page *page;
+ struct folio *folio;
unsigned int i;
- page = read_cache_page_gfp(bdev->bd_mapping,
- SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL);
- if (IS_ERR(page))
+ folio = mapping_read_folio_gfp(bdev->bd_mapping,
+ SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL);
+ if (IS_ERR(folio))
return "IO error";
- s = page_address(page) + offset_in_page(SB_OFFSET);
+ s = folio_address(folio) + offset_in_folio(folio, SB_OFFSET);
sb->offset = le64_to_cpu(s->offset);
sb->version = le64_to_cpu(s->version);
@@ -272,7 +272,7 @@ static const char *read_super(struct cache_sb *sb, struct
block_device *bdev,
*res = s;
return NULL;
err:
- put_page(page);
+ folio_put(folio);
return err;
}
@@ -1366,7 +1366,7 @@ static CLOSURE_CALLBACK(cached_dev_free)
mutex_unlock(&bch_register_lock);
if (dc->sb_disk)
- put_page(virt_to_page(dc->sb_disk));
+ folio_put(virt_to_folio(dc->sb_disk));
if (dc->bdev_file)
fput(dc->bdev_file);
@@ -2215,7 +2215,7 @@ void bch_cache_release(struct kobject *kobj)
free_fifo(&ca->free[i]);
if (ca->sb_disk)
- put_page(virt_to_page(ca->sb_disk));
+ folio_put(virt_to_folio(ca->sb_disk));
if (ca->bdev_file)
fput(ca->bdev_file);
@@ -2592,7 +2592,7 @@ static ssize_t register_bcache(struct kobject *k, struct
kobj_attribute *attr,
if (!holder) {
ret = -ENOMEM;
err = "cannot allocate memory";
- goto out_put_sb_page;
+ goto out_put_sb_folio;
}
/* Now reopen in exclusive mode with proper holder */
@@ -2666,8 +2666,8 @@ static ssize_t register_bcache(struct kobject *k, struct
kobj_attribute *attr,
out_free_holder:
kfree(holder);
-out_put_sb_page:
- put_page(virt_to_page(sb_disk));
+out_put_sb_folio:
+ folio_put(virt_to_folio(sb_disk));
out_blkdev_put:
if (bdev_file)
fput(bdev_file);
--
2.47.2
