14 #define PAGE_OFS(ofs) ((ofs) & (PAGE_SIZE-1))  argument
16 static int logfs_mtd_read(struct super_block *sb, loff_t ofs, size_t len,  in logfs_mtd_read()  argument
23 	ret = mtd_read(mtd, ofs, len, &retlen, buf);  in logfs_mtd_read()
35 static int loffs_mtd_write(struct super_block *sb, loff_t ofs, size_t len,  in loffs_mtd_write()  argument
47 	BUG_ON((ofs >= mtd->size) || (len > mtd->size - ofs));  in loffs_mtd_write()
48 	BUG_ON(ofs != (ofs >> super->s_writeshift) << super->s_writeshift);  in loffs_mtd_write()
50 	page_start = ofs & PAGE_CACHE_MASK;  in loffs_mtd_write()
51 	page_end = PAGE_CACHE_ALIGN(ofs + len) - 1;  in loffs_mtd_write()
52 	ret = mtd_write(mtd, ofs, len, &retlen, buf);  in loffs_mtd_write()
72 static int logfs_mtd_erase_mapping(struct super_block *sb, loff_t ofs,  in logfs_mtd_erase_mapping()  argument
78 	pgoff_t index = ofs >> PAGE_SHIFT;  in logfs_mtd_erase_mapping()
80 	for (index = ofs >> PAGE_SHIFT; index < (ofs + len) >> PAGE_SHIFT; index++) {  in logfs_mtd_erase_mapping()
90 static int logfs_mtd_erase(struct super_block *sb, loff_t ofs, size_t len,  in logfs_mtd_erase()  argument
104 	ei.addr = ofs;  in logfs_mtd_erase()
115 	return logfs_mtd_erase_mapping(sb, ofs, len);  in logfs_mtd_erase()
148 static struct page *logfs_mtd_find_first_sb(struct super_block *sb, u64 *ofs)  in logfs_mtd_find_first_sb()  argument
155 	*ofs = 0;  in logfs_mtd_find_first_sb()
156 	while (mtd_block_isbad(mtd, *ofs)) {  in logfs_mtd_find_first_sb()
157 		*ofs += mtd->erasesize;  in logfs_mtd_find_first_sb()
158 		if (*ofs >= mtd->size)  in logfs_mtd_find_first_sb()
161 	BUG_ON(*ofs & ~PAGE_MASK);  in logfs_mtd_find_first_sb()
162 	return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);  in logfs_mtd_find_first_sb()
165 static struct page *logfs_mtd_find_last_sb(struct super_block *sb, u64 *ofs)  in logfs_mtd_find_last_sb()  argument
172 	*ofs = mtd->size - mtd->erasesize;  in logfs_mtd_find_last_sb()
173 	while (mtd_block_isbad(mtd, *ofs)) {  in logfs_mtd_find_last_sb()
174 		*ofs -= mtd->erasesize;  in logfs_mtd_find_last_sb()
175 		if (*ofs <= 0)  in logfs_mtd_find_last_sb()
178 	*ofs = *ofs + mtd->erasesize - 0x1000;  in logfs_mtd_find_last_sb()
179 	BUG_ON(*ofs & ~PAGE_MASK);  in logfs_mtd_find_last_sb()
180 	return read_cache_page(mapping, *ofs >> PAGE_SHIFT, filler, sb);  in logfs_mtd_find_last_sb()
183 static int __logfs_mtd_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,  in __logfs_mtd_writeseg()  argument
205 static void logfs_mtd_writeseg(struct super_block *sb, u64 ofs, size_t len)  in logfs_mtd_writeseg()  argument
220 	head = ofs & (PAGE_SIZE - 1);  in logfs_mtd_writeseg()
222 		ofs -= head;  in logfs_mtd_writeseg()
226 	__logfs_mtd_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);  in logfs_mtd_writeseg()
234 static int logfs_mtd_can_write_buf(struct super_block *sb, u64 ofs)  in logfs_mtd_can_write_buf()  argument
243 	err = logfs_mtd_read(sb, ofs, super->s_writesize, buf);  in logfs_mtd_can_write_buf()