VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100  1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  2) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  3)  * QNX4 file system, Linux implementation.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  4)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  5)  * Version : 0.2.1
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  6)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  7)  * Using parts of the xiafs filesystem.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  8)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  9)  * History :
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 10)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 11)  * 28-05-1998 by Richard Frowijn : first release.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 12)  * 20-06-1998 by Frank Denis : basic optimisations.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 13)  * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap .
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 14)  * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) .
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 15)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 16) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 17) #include <linux/buffer_head.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 18) #include <linux/bitops.h>
964f5369667b3 (Al Viro            2009-06-07 09:47:13 -0400 19) #include "qnx4.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 20) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 21) unsigned long qnx4_count_free_blocks(struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 22) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 23) 	int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 24) 	int total = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 25) 	int total_free = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 26) 	int offset = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 27) 	int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 28) 	struct buffer_head *bh;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 29) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 30) 	while (total < size) {
9b58f6d4aaef0 (Akinobu Mita       2012-07-30 14:40:57 -0700 31) 		int bytes = min(size - total, QNX4_BLOCK_SIZE);
9b58f6d4aaef0 (Akinobu Mita       2012-07-30 14:40:57 -0700 32) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 33) 		if ((bh = sb_bread(sb, start + offset)) == NULL) {
891ddb95d06e9 (Anders Larsen      2009-09-26 20:15:09 +0200 34) 			printk(KERN_ERR "qnx4: I/O error in counting free blocks\n");
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 35) 			break;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 36) 		}
9b58f6d4aaef0 (Akinobu Mita       2012-07-30 14:40:57 -0700 37) 		total_free += bytes * BITS_PER_BYTE -
9b58f6d4aaef0 (Akinobu Mita       2012-07-30 14:40:57 -0700 38) 				memweight(bh->b_data, bytes);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 39) 		brelse(bh);
9b58f6d4aaef0 (Akinobu Mita       2012-07-30 14:40:57 -0700 40) 		total += bytes;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 41) 		offset++;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 42) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 43) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 44) 	return total_free;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 45) }