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block: Convert read_part_sector() to use a folio 

This relatively straightforward converion saves a call to compound_head()
hidden inside put_page().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-05-17 23:43:35 -04:00
parent 069fc464f1
commit 4fdc08d418
2 changed files with 7 additions and 7 deletions
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4
block/partitions/check.h
View File

@ -24,13 +24,13 @@ struct parsed_partitions {
};
typedef struct {
struct page *v;
struct folio *v;
} Sector;
void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p);
static inline void put_dev_sector(Sector p)
{
put_page(p.v);
folio_put(p.v);
}
static inline void

10
block/partitions/core.c
View File

@ -705,19 +705,19 @@ EXPORT_SYMBOL_GPL(bdev_disk_changed);
void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
{
struct address_space *mapping = state->disk->part0->bd_inode->i_mapping;
struct page *page;
struct folio *folio;
if (n >= get_capacity(state->disk)) {
state->access_beyond_eod = true;
goto out;
}
page = read_mapping_page(mapping, n >> PAGE_SECTORS_SHIFT, NULL);
if (IS_ERR(page))
folio = read_mapping_folio(mapping, n >> PAGE_SECTORS_SHIFT, NULL);
if (IS_ERR(folio))
goto out;
p->v = page;
return page_address(page) + offset_in_page(n * SECTOR_SIZE);
p->v = folio;
return folio_address(folio) + offset_in_folio(folio, n * SECTOR_SIZE);
out:
p->v = NULL;
return NULL;