1 // SPDX-License-Identifier: GPL-2.0
20 		u32 offset, u32 *max)  in hfsplus_block_allocate()  argument
23 	struct page *page;  in hfsplus_block_allocate()  local
34 	hfs_dbg(BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len);  in hfsplus_block_allocate()
35 	mutex_lock(&sbi->alloc_mutex);  in hfsplus_block_allocate()
36 	mapping = sbi->alloc_file->i_mapping;  in hfsplus_block_allocate()
37 	page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS, NULL);  in hfsplus_block_allocate()
38 	if (IS_ERR(page)) {  in hfsplus_block_allocate()
42 	pptr = kmap_local_page(page);  in hfsplus_block_allocate()
43 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;  in hfsplus_block_allocate()
44 	i = offset % 32;  in hfsplus_block_allocate()
45 	offset &= ~(PAGE_CACHE_BITS - 1);  in hfsplus_block_allocate()
46 	if ((size ^ offset) / PAGE_CACHE_BITS)  in hfsplus_block_allocate()
49 		end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;  in hfsplus_block_allocate()
78 		offset += PAGE_CACHE_BITS;  in hfsplus_block_allocate()
79 		if (offset >= size)  in hfsplus_block_allocate()
81 		page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,  in hfsplus_block_allocate()
83 		if (IS_ERR(page)) {  in hfsplus_block_allocate()
87 		curr = pptr = kmap_local_page(page);  in hfsplus_block_allocate()
88 		if ((size ^ offset) / PAGE_CACHE_BITS)  in hfsplus_block_allocate()
91 			end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;  in hfsplus_block_allocate()
98 	start = offset + (curr - pptr) * 32 + i;  in hfsplus_block_allocate()
104 	len = min(size - start, len);  in hfsplus_block_allocate()
110 		if (!--len || n & mask)  in hfsplus_block_allocate()
113 	if (!--len)  in hfsplus_block_allocate()
127 			len -= 32;  in hfsplus_block_allocate()
129 		set_page_dirty(page);  in hfsplus_block_allocate()
131 		offset += PAGE_CACHE_BITS;  in hfsplus_block_allocate()
132 		page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,  in hfsplus_block_allocate()
134 		if (IS_ERR(page)) {  in hfsplus_block_allocate()
138 		pptr = kmap_local_page(page);  in hfsplus_block_allocate()
153 	set_page_dirty(page);  in hfsplus_block_allocate()
155 	*max = offset + (curr - pptr) * 32 + i - start;  in hfsplus_block_allocate()
156 	sbi->free_blocks -= *max;  in hfsplus_block_allocate()
158 	hfs_dbg(BITMAP, "-> %u,%u\n", start, *max);  in hfsplus_block_allocate()
160 	mutex_unlock(&sbi->alloc_mutex);  in hfsplus_block_allocate()
164 int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)  in hfsplus_block_free()  argument
167 	struct page *page;  in hfsplus_block_free()  local
177 	hfs_dbg(BITMAP, "block_free: %u,%u\n", offset, count);  in hfsplus_block_free()
179 	if ((offset + count) > sbi->total_blocks)  in hfsplus_block_free()
180 		return -ENOENT;  in hfsplus_block_free()
182 	mutex_lock(&sbi->alloc_mutex);  in hfsplus_block_free()
183 	mapping = sbi->alloc_file->i_mapping;  in hfsplus_block_free()
184 	pnr = offset / PAGE_CACHE_BITS;  in hfsplus_block_free()
185 	page = read_mapping_page(mapping, pnr, NULL);  in hfsplus_block_free()
186 	if (IS_ERR(page))  in hfsplus_block_free()
188 	pptr = kmap_local_page(page);  in hfsplus_block_free()
189 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;  in hfsplus_block_free()
194 	i = offset % 32;  in hfsplus_block_free()
196 		int j = 32 - i;  in hfsplus_block_free()
204 		count -= j;  in hfsplus_block_free()
213 			count -= 32;  in hfsplus_block_free()
217 		set_page_dirty(page);  in hfsplus_block_free()
219 		page = read_mapping_page(mapping, ++pnr, NULL);  in hfsplus_block_free()
220 		if (IS_ERR(page))  in hfsplus_block_free()
222 		pptr = kmap_local_page(page);  in hfsplus_block_free()
233 	set_page_dirty(page);  in hfsplus_block_free()
235 	sbi->free_blocks += len;  in hfsplus_block_free()
237 	mutex_unlock(&sbi->alloc_mutex);  in hfsplus_block_free()
242 	pr_crit("unable to mark blocks free: error %ld\n", PTR_ERR(page));  in hfsplus_block_free()
243 	mutex_unlock(&sbi->alloc_mutex);  in hfsplus_block_free()
245 	return -EIO;  in hfsplus_block_free()