24 static void *cache_first_page(struct squashfs_page_actor *actor)  in cache_first_page()  argument
26 	actor->next_page = 1;  in cache_first_page()
27 	return actor->buffer[0];  in cache_first_page()
30 static void *cache_next_page(struct squashfs_page_actor *actor)  in cache_next_page()  argument
32 	if (actor->next_page == actor->pages)  in cache_next_page()
35 	return actor->buffer[actor->next_page++];  in cache_next_page()
38 static void cache_finish_page(struct squashfs_page_actor *actor)  in cache_finish_page()  argument
46 	struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);  in squashfs_page_actor_init()  local
48 	if (actor == NULL)  in squashfs_page_actor_init()
51 	actor->length = length ? : pages * PAGE_SIZE;  in squashfs_page_actor_init()
52 	actor->buffer = buffer;  in squashfs_page_actor_init()
53 	actor->pages = pages;  in squashfs_page_actor_init()
54 	actor->next_page = 0;  in squashfs_page_actor_init()
55 	actor->tmp_buffer = NULL;  in squashfs_page_actor_init()
56 	actor->squashfs_first_page = cache_first_page;  in squashfs_page_actor_init()
57 	actor->squashfs_next_page = cache_next_page;  in squashfs_page_actor_init()
58 	actor->squashfs_finish_page = cache_finish_page;  in squashfs_page_actor_init()
59 	return actor;  in squashfs_page_actor_init()
63 static void *handle_next_page(struct squashfs_page_actor *actor)  in handle_next_page()  argument
65 	int max_pages = (actor->length + PAGE_SIZE - 1) >> PAGE_SHIFT;  in handle_next_page()
67 	if (actor->returned_pages == max_pages)  in handle_next_page()
70 	if ((actor->next_page == actor->pages) ||  in handle_next_page()
71 			(actor->next_index != actor->page[actor->next_page]->index)) {  in handle_next_page()
72 		actor->next_index++;  in handle_next_page()
73 		actor->returned_pages++;  in handle_next_page()
74 		actor->last_page = NULL;  in handle_next_page()
75 		return actor->alloc_buffer ? actor->tmp_buffer : ERR_PTR(-ENOMEM);  in handle_next_page()
78 	actor->next_index++;  in handle_next_page()
79 	actor->returned_pages++;  in handle_next_page()
80 	actor->last_page = actor->page[actor->next_page];  in handle_next_page()
81 	return actor->pageaddr = kmap_local_page(actor->page[actor->next_page++]);  in handle_next_page()
84 static void *direct_first_page(struct squashfs_page_actor *actor)  in direct_first_page()  argument
86 	return handle_next_page(actor);  in direct_first_page()
89 static void *direct_next_page(struct squashfs_page_actor *actor)  in direct_next_page()  argument
91 	if (actor->pageaddr) {  in direct_next_page()
92 		kunmap_local(actor->pageaddr);  in direct_next_page()
93 		actor->pageaddr = NULL;  in direct_next_page()
96 	return handle_next_page(actor);  in direct_next_page()
99 static void direct_finish_page(struct squashfs_page_actor *actor)  in direct_finish_page()  argument
101 	if (actor->pageaddr)  in direct_finish_page()
102 		kunmap_local(actor->pageaddr);  in direct_finish_page()
108 	struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);  in squashfs_page_actor_init_special()  local
110 	if (actor == NULL)  in squashfs_page_actor_init_special()
114 		actor->tmp_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);  in squashfs_page_actor_init_special()
116 		if (actor->tmp_buffer == NULL) {  in squashfs_page_actor_init_special()
117 			kfree(actor);  in squashfs_page_actor_init_special()
121 		actor->tmp_buffer = NULL;  in squashfs_page_actor_init_special()
123 	actor->length = length ? : pages * PAGE_SIZE;  in squashfs_page_actor_init_special()
124 	actor->page = page;  in squashfs_page_actor_init_special()
125 	actor->pages = pages;  in squashfs_page_actor_init_special()
126 	actor->next_page = 0;  in squashfs_page_actor_init_special()
127 	actor->returned_pages = 0;  in squashfs_page_actor_init_special()
128 	actor->next_index = page[0]->index & ~((1 << (msblk->block_log - PAGE_SHIFT)) - 1);  in squashfs_page_actor_init_special()
129 	actor->pageaddr = NULL;  in squashfs_page_actor_init_special()
130 	actor->last_page = NULL;  in squashfs_page_actor_init_special()
131 	actor->alloc_buffer = msblk->decompressor->alloc_buffer;  in squashfs_page_actor_init_special()
132 	actor->squashfs_first_page = direct_first_page;  in squashfs_page_actor_init_special()
133 	actor->squashfs_next_page = direct_next_page;  in squashfs_page_actor_init_special()
134 	actor->squashfs_finish_page = direct_finish_page;  in squashfs_page_actor_init_special()
135 	return actor;  in squashfs_page_actor_init_special()