fs/hfsplus/bitmap.c

1 // SPDX-License-Identifier: GPL-2.0
19 int hfsplus_block_allocate(struct super_block *sb, u32 size,
32 		return size;
34 	hfs_dbg(BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len);
35 	mutex_lock(&sbi->alloc_mutex);
36 	mapping = sbi->alloc_file->i_mapping;
39 		start = size;
43 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
45 	offset &= ~(PAGE_CACHE_BITS - 1);
46 	if ((size ^ offset) / PAGE_CACHE_BITS)
49 		end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;
79 		if (offset >= size)
84 			start = size;
88 		if ((size ^ offset) / PAGE_CACHE_BITS)
91 			end = pptr + ((size + 31) & (PAGE_CACHE_BITS - 1)) / 32;
93 	hfs_dbg(BITMAP, "bitmap full\n");
94 	start = size;
98 	start = offset + (curr - pptr) * 32 + i;
99 	if (start >= size) {
100 		hfs_dbg(BITMAP, "bitmap full\n");
104 	len = min(size - start, len);
110 		if (!--len || n & mask)
113 	if (!--len)
116 	/* do full u32s */
127 			len -= 32;
135 			start = size;
155 	*max = offset + (curr - pptr) * 32 + i - start;
156 	sbi->free_blocks -= *max;
158 	hfs_dbg(BITMAP, "-> %u,%u\n", start, *max);
160 	mutex_unlock(&sbi->alloc_mutex);
179 	if ((offset + count) > sbi->total_blocks)
180 		return -ENOENT;
182 	mutex_lock(&sbi->alloc_mutex);
183 	mapping = sbi->alloc_file->i_mapping;
189 	curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
196 		int j = 32 - i;
204 		count -= j;
207 	/* do full u32s */
213 			count -= 32;
235 	sbi->free_blocks += len;
237 	mutex_unlock(&sbi->alloc_mutex);
243 	mutex_unlock(&sbi->alloc_mutex);
245 	return -EIO;