Commit c8293894 authored by David Sterba's avatar David Sterba

btrfs: add helpers to get inode from page/folio pointers

Add convenience helpers to get a struct btrfs_inode from a page or folio
pointer instead of open coding the chain or intermediate BTRFS_I. This
is implemented as a macro (still with type checking) so we don't need
full definitions of struct page or address_space.
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarAnand Jain <anand.jain@oracle.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b2136cc2
...@@ -528,7 +528,8 @@ static void btree_invalidate_folio(struct folio *folio, size_t offset, ...@@ -528,7 +528,8 @@ static void btree_invalidate_folio(struct folio *folio, size_t offset,
size_t length) size_t length)
{ {
struct extent_io_tree *tree; struct extent_io_tree *tree;
tree = &BTRFS_I(folio->mapping->host)->io_tree;
tree = &folio_to_inode(folio)->io_tree;
extent_invalidate_folio(tree, folio, offset); extent_invalidate_folio(tree, folio, offset);
btree_release_folio(folio, GFP_NOFS); btree_release_folio(folio, GFP_NOFS);
if (folio_get_private(folio)) { if (folio_get_private(folio)) {
......
...@@ -819,7 +819,7 @@ static void submit_extent_page(struct btrfs_bio_ctrl *bio_ctrl, ...@@ -819,7 +819,7 @@ static void submit_extent_page(struct btrfs_bio_ctrl *bio_ctrl,
u64 disk_bytenr, struct page *page, u64 disk_bytenr, struct page *page,
size_t size, unsigned long pg_offset) size_t size, unsigned long pg_offset)
{ {
struct btrfs_inode *inode = BTRFS_I(page->mapping->host); struct btrfs_inode *inode = page_to_inode(page);
ASSERT(pg_offset + size <= PAGE_SIZE); ASSERT(pg_offset + size <= PAGE_SIZE);
ASSERT(bio_ctrl->end_io_func); ASSERT(bio_ctrl->end_io_func);
...@@ -1151,7 +1151,7 @@ static int btrfs_do_readpage(struct page *page, struct extent_map **em_cached, ...@@ -1151,7 +1151,7 @@ static int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
int btrfs_read_folio(struct file *file, struct folio *folio) int btrfs_read_folio(struct file *file, struct folio *folio)
{ {
struct page *page = &folio->page; struct page *page = &folio->page;
struct btrfs_inode *inode = BTRFS_I(page->mapping->host); struct btrfs_inode *inode = page_to_inode(page);
u64 start = page_offset(page); u64 start = page_offset(page);
u64 end = start + PAGE_SIZE - 1; u64 end = start + PAGE_SIZE - 1;
struct btrfs_bio_ctrl bio_ctrl = { .opf = REQ_OP_READ }; struct btrfs_bio_ctrl bio_ctrl = { .opf = REQ_OP_READ };
...@@ -1174,7 +1174,7 @@ static inline void contiguous_readpages(struct page *pages[], int nr_pages, ...@@ -1174,7 +1174,7 @@ static inline void contiguous_readpages(struct page *pages[], int nr_pages,
struct btrfs_bio_ctrl *bio_ctrl, struct btrfs_bio_ctrl *bio_ctrl,
u64 *prev_em_start) u64 *prev_em_start)
{ {
struct btrfs_inode *inode = BTRFS_I(pages[0]->mapping->host); struct btrfs_inode *inode = page_to_inode(pages[0]);
int index; int index;
btrfs_lock_and_flush_ordered_range(inode, start, end, NULL); btrfs_lock_and_flush_ordered_range(inode, start, end, NULL);
...@@ -2372,7 +2372,7 @@ int try_release_extent_mapping(struct page *page, gfp_t mask) ...@@ -2372,7 +2372,7 @@ int try_release_extent_mapping(struct page *page, gfp_t mask)
struct extent_map *em; struct extent_map *em;
u64 start = page_offset(page); u64 start = page_offset(page);
u64 end = start + PAGE_SIZE - 1; u64 end = start + PAGE_SIZE - 1;
struct btrfs_inode *btrfs_inode = BTRFS_I(page->mapping->host); struct btrfs_inode *btrfs_inode = page_to_inode(page);
struct extent_io_tree *tree = &btrfs_inode->io_tree; struct extent_io_tree *tree = &btrfs_inode->io_tree;
struct extent_map_tree *map = &btrfs_inode->extent_tree; struct extent_map_tree *map = &btrfs_inode->extent_tree;
......
...@@ -831,6 +831,11 @@ struct btrfs_fs_info { ...@@ -831,6 +831,11 @@ struct btrfs_fs_info {
#endif #endif
}; };
#define page_to_inode(_page) (BTRFS_I(_Generic((_page), \
struct page *: (_page))->mapping->host))
#define folio_to_inode(_folio) (BTRFS_I(_Generic((_folio), \
struct folio *: (_folio))->mapping->host))
static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info) static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info)
{ {
return READ_ONCE(fs_info->generation); return READ_ONCE(fs_info->generation);
......
...@@ -7971,7 +7971,7 @@ static int btrfs_migrate_folio(struct address_space *mapping, ...@@ -7971,7 +7971,7 @@ static int btrfs_migrate_folio(struct address_space *mapping,
static void btrfs_invalidate_folio(struct folio *folio, size_t offset, static void btrfs_invalidate_folio(struct folio *folio, size_t offset,
size_t length) size_t length)
{ {
struct btrfs_inode *inode = BTRFS_I(folio->mapping->host); struct btrfs_inode *inode = folio_to_inode(folio);
struct btrfs_fs_info *fs_info = inode->root->fs_info; struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct extent_io_tree *tree = &inode->io_tree; struct extent_io_tree *tree = &inode->io_tree;
struct extent_state *cached_state = NULL; struct extent_state *cached_state = NULL;
......
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