Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * linux/fs/befs/io.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Based on portions of file.c and inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Many thanks to Dominic Giampaolo, author of Practical File System
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Design with the Be File System, for such a helpful book.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "befs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "io.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * Converts befs notion of disk addr to a disk offset and uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * linux kernel function sb_bread() to get the buffer containing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * the offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct buffer_head *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	befs_blocknr_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	struct befs_sb_info *befs_sb = BEFS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	befs_debug(sb, "---> Enter %s "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		   "[%u, %hu, %hu]", __func__, iaddr.allocation_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		   iaddr.start, iaddr.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (iaddr.allocation_group > befs_sb->num_ags) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			   iaddr.allocation_group, befs_sb->num_ags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	block = iaddr2blockno(sb, &iaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	befs_debug(sb, "%s: offset = %lu", __func__, (unsigned long)block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	bh = sb_bread(sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		befs_error(sb, "Failed to read block %lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			   (unsigned long)block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	befs_debug(sb, "<--- %s", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	befs_debug(sb, "<--- %s ERROR", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }