1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * linux/fs/befs/io.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Based on portions of file.c and inode.c
81da177e4SLinus Torvalds * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
91da177e4SLinus Torvalds *
101da177e4SLinus Torvalds * Many thanks to Dominic Giampaolo, author of Practical File System
111da177e4SLinus Torvalds * Design with the Be File System, for such a helpful book.
121da177e4SLinus Torvalds *
131da177e4SLinus Torvalds */
141da177e4SLinus Torvalds
151da177e4SLinus Torvalds #include <linux/buffer_head.h>
161da177e4SLinus Torvalds
171da177e4SLinus Torvalds #include "befs.h"
181da177e4SLinus Torvalds #include "io.h"
191da177e4SLinus Torvalds
201da177e4SLinus Torvalds /*
211da177e4SLinus Torvalds * Converts befs notion of disk addr to a disk offset and uses
221da177e4SLinus Torvalds * linux kernel function sb_bread() to get the buffer containing
2350b00fc4SLuis de Bethencourt * the offset.
241da177e4SLinus Torvalds */
251da177e4SLinus Torvalds
261da177e4SLinus Torvalds struct buffer_head *
befs_bread_iaddr(struct super_block * sb,befs_inode_addr iaddr)271da177e4SLinus Torvalds befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
281da177e4SLinus Torvalds {
2977169af8SSalah Triki struct buffer_head *bh;
3078f647c2SSalah Triki befs_blocknr_t block;
31038428fcSFabian Frederick struct befs_sb_info *befs_sb = BEFS_SB(sb);
321da177e4SLinus Torvalds
33dac52fc1SFabian Frederick befs_debug(sb, "---> Enter %s "
34dac52fc1SFabian Frederick "[%u, %hu, %hu]", __func__, iaddr.allocation_group,
35dac52fc1SFabian Frederick iaddr.start, iaddr.len);
361da177e4SLinus Torvalds
371da177e4SLinus Torvalds if (iaddr.allocation_group > befs_sb->num_ags) {
381da177e4SLinus Torvalds befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
391da177e4SLinus Torvalds iaddr.allocation_group, befs_sb->num_ags);
401da177e4SLinus Torvalds goto error;
411da177e4SLinus Torvalds }
421da177e4SLinus Torvalds
431da177e4SLinus Torvalds block = iaddr2blockno(sb, &iaddr);
441da177e4SLinus Torvalds
45dac52fc1SFabian Frederick befs_debug(sb, "%s: offset = %lu", __func__, (unsigned long)block);
461da177e4SLinus Torvalds
471da177e4SLinus Torvalds bh = sb_bread(sb, block);
481da177e4SLinus Torvalds
491da177e4SLinus Torvalds if (bh == NULL) {
50dac52fc1SFabian Frederick befs_error(sb, "Failed to read block %lu",
51dac52fc1SFabian Frederick (unsigned long)block);
521da177e4SLinus Torvalds goto error;
531da177e4SLinus Torvalds }
541da177e4SLinus Torvalds
55dac52fc1SFabian Frederick befs_debug(sb, "<--- %s", __func__);
561da177e4SLinus Torvalds return bh;
571da177e4SLinus Torvalds
581da177e4SLinus Torvalds error:
59dac52fc1SFabian Frederick befs_debug(sb, "<--- %s ERROR", __func__);
601da177e4SLinus Torvalds return NULL;
611da177e4SLinus Torvalds }
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