fs/btrfs/accessors.c

27 void btrfs_init_map_token(struct btrfs_map_token *token, struct extent_buffer *eb)  in btrfs_init_map_token()  argument
29 	token->eb = eb;  in btrfs_init_map_token()
30 	token->kaddr = folio_address(eb->folios[0]);  in btrfs_init_map_token()
31 	token->offset = 0;  in btrfs_init_map_token()
43  * Generic helpers with a token (cached address of the most recently accessed
59 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token,		\
63 	const unsigned long idx = get_eb_folio_index(token->eb, member_offset); \
64 	const unsigned long oil = get_eb_offset_in_folio(token->eb,	\
66 	const int unit_size = folio_size(token->eb->folios[0]);		\
67 	const int unit_shift = folio_shift(token->eb->folios[0]);	\
72 	ASSERT(token);							\
73 	ASSERT(token->kaddr);						\
74 	ASSERT(check_setget_bounds(token->eb, ptr, off, size));		\
75 	if (token->offset <= member_offset &&				\
76 	    member_offset + size <= token->offset + unit_size) {	\
77 		return get_unaligned_le##bits(token->kaddr + oil);	\
79 	token->kaddr = folio_address(token->eb->folios[idx]);		\
80 	token->offset = idx << unit_shift;				\
82 		return get_unaligned_le##bits(token->kaddr + oil);	\
84 	memcpy(lebytes, token->kaddr + oil, part);			\
85 	token->kaddr = folio_address(token->eb->folios[idx + 1]);	\
86 	token->offset = (idx + 1) << unit_shift;			\
87 	memcpy(lebytes + part, token->kaddr, size - part);		\
112 void btrfs_set_token_##bits(struct btrfs_map_token *token,		\
117 	const unsigned long idx = get_eb_folio_index(token->eb, member_offset); \
118 	const unsigned long oil = get_eb_offset_in_folio(token->eb,	\
120 	const int unit_size = folio_size(token->eb->folios[0]);		\
121 	const int unit_shift = folio_shift(token->eb->folios[0]);	\
126 	ASSERT(token);							\
127 	ASSERT(token->kaddr);						\
128 	ASSERT(check_setget_bounds(token->eb, ptr, off, size));		\
129 	if (token->offset <= member_offset &&				\
130 	    member_offset + size <= token->offset + unit_size) {	\
131 		put_unaligned_le##bits(val, token->kaddr + oil);	\
134 	token->kaddr = folio_address(token->eb->folios[idx]);		\
135 	token->offset = idx << unit_shift;				\
138 		put_unaligned_le##bits(val, token->kaddr + oil);	\
142 	memcpy(token->kaddr + oil, lebytes, part);			\
143 	token->kaddr = folio_address(token->eb->folios[idx + 1]);	\
144 	token->offset = (idx + 1) << unit_shift;			\
145 	memcpy(token->kaddr, lebytes + part, size - part);		\