/*
 * QNX6 file system, Linux implementation.
 *
 * Version : 1.0.0
 *
 * History :
 *
 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
 *
 */

#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/crc32.h>
#include "qnx6.h"

static void qnx6_mmi_copy_sb(struct qnx6_super_block *qsb,
		struct qnx6_mmi_super_block *sb)
{
	qsb->sb_magic = sb->sb_magic;
	qsb->sb_checksum = sb->sb_checksum;
	qsb->sb_serial = sb->sb_serial;
	qsb->sb_blocksize = sb->sb_blocksize;
	qsb->sb_num_inodes = sb->sb_num_inodes;
	qsb->sb_free_inodes = sb->sb_free_inodes;
	qsb->sb_num_blocks = sb->sb_num_blocks;
	qsb->sb_free_blocks = sb->sb_free_blocks;

	/* the rest of the superblock is the same */
	memcpy(&qsb->Inode, &sb->Inode, sizeof(sb->Inode));
	memcpy(&qsb->Bitmap, &sb->Bitmap, sizeof(sb->Bitmap));
	memcpy(&qsb->Longfile, &sb->Longfile, sizeof(sb->Longfile));
}

struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s, int silent)
{
	struct buffer_head *bh1, *bh2 = NULL;
	struct qnx6_mmi_super_block *sb1, *sb2;
	struct qnx6_super_block *qsb = NULL;
	struct qnx6_sb_info *sbi;
	__u64 offset;

	/* Check the superblock signatures
	   start with the first superblock */
	bh1 = sb_bread(s, 0);
	if (!bh1) {
		pr_err("Unable to read first mmi superblock\n");
		return NULL;
	}
	sb1 = (struct qnx6_mmi_super_block *)bh1->b_data;
	sbi = QNX6_SB(s);
	if (fs32_to_cpu(sbi, sb1->sb_magic) != QNX6_SUPER_MAGIC) {
		if (!silent) {
			pr_err("wrong signature (magic) in superblock #1.\n");
			goto out;
		}
	}

	/* checksum check - start at byte 8 and end at byte 512 */
	if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
				crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
		pr_err("superblock #1 checksum error\n");
		goto out;
	}

	/* calculate second superblock blocknumber */
	offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + QNX6_SUPERBLOCK_AREA /
					fs32_to_cpu(sbi, sb1->sb_blocksize);

	/* set new blocksize */
	if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
		pr_err("unable to set blocksize\n");
		goto out;
	}
	/* blocksize invalidates bh - pull it back in */
	brelse(bh1);
	bh1 = sb_bread(s, 0);
	if (!bh1)
		goto out;
	sb1 = (struct qnx6_mmi_super_block *)bh1->b_data;

	/* read second superblock */
	bh2 = sb_bread(s, offset);
	if (!bh2) {
		pr_err("unable to read the second superblock\n");
		goto out;
	}
	sb2 = (struct qnx6_mmi_super_block *)bh2->b_data;
	if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
		if (!silent)
			pr_err("wrong signature (magic) in superblock #2.\n");
		goto out;
	}

	/* checksum check - start at byte 8 and end at byte 512 */
	if (fs32_to_cpu(sbi, sb2->sb_checksum)
			!= crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
		pr_err("superblock #1 checksum error\n");
		goto out;
	}

	qsb = kmalloc(sizeof(*qsb), GFP_KERNEL);
	if (!qsb) {
		pr_err("unable to allocate memory.\n");
		goto out;
	}

	if (fs64_to_cpu(sbi, sb1->sb_serial) >
					fs64_to_cpu(sbi, sb2->sb_serial)) {
		/* superblock #1 active */
		qnx6_mmi_copy_sb(qsb, sb1);
#ifdef CONFIG_QNX6FS_DEBUG
		qnx6_superblock_debug(qsb, s);
#endif
		memcpy(bh1->b_data, qsb, sizeof(struct qnx6_super_block));

		sbi->sb_buf = bh1;
		sbi->sb = (struct qnx6_super_block *)bh1->b_data;
		brelse(bh2);
		pr_info("superblock #1 active\n");
	} else {
		/* superblock #2 active */
		qnx6_mmi_copy_sb(qsb, sb2);
#ifdef CONFIG_QNX6FS_DEBUG
		qnx6_superblock_debug(qsb, s);
#endif
		memcpy(bh2->b_data, qsb, sizeof(struct qnx6_super_block));

		sbi->sb_buf = bh2;
		sbi->sb = (struct qnx6_super_block *)bh2->b_data;
		brelse(bh1);
		pr_info("superblock #2 active\n");
	}
	kfree(qsb);

	/* offset for mmi_fs is just SUPERBLOCK_AREA bytes */
	sbi->s_blks_off = QNX6_SUPERBLOCK_AREA / s->s_blocksize;

	/* success */
	return sbi->sb;

out:
	if (bh1 != NULL)
		brelse(bh1);
	if (bh2 != NULL)
		brelse(bh2);
	return NULL;
}
on value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/irda/irlan/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>74e3a6b53f5fad9f7848ab1b9f6921b7012940a4</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/irda/irlan/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>net/irda/irlan/Makefile</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/Makefile?id=0263d4ebd94b36280608e296cba39b924b6e832b'>0263d4ebd94b36280608e296cba39b924b6e832b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/irda/irlan/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=0263d4ebd94b36280608e296cba39b924b6e832b'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irlan/Makefile?id=aab45453ff5c77200c6da4ac909f7a4392aed17e'>aab45453ff5c77200c6da4ac909f7a4392aed17e</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/irda/irlan/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=aab45453ff5c77200c6da4ac909f7a4392aed17e'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'akpm' (patches from Andrew)</div><div class='commit-msg'>Merge fixes from Andrew Morton:
 "26 fixes"

* emailed patches from Andrew Morton &lt;akpm@linux-foundation.org&gt;: (26 commits)
  MAINTAINERS: add Dan Streetman to zbud maintainers
  MAINTAINERS: add Dan Streetman to zswap maintainers
  mm: do not export ioremap_page_range symbol for external module
  mn10300: fix build error of missing fpu_save()
  romfs: use different way to generate fsid for BLOCK or MTD
  frv: add missing atomic64 operations
  mm, page_alloc: fix premature OOM when racing with cpuset mems update
  mm, page_alloc: move cpuset seqcount checking to slowpath
  mm, page_alloc: fix fast-path race with cpuset update or removal
  mm, page_alloc: fix check for NULL preferred_zone
  kernel/panic.c: add missing \n
  fbdev: color map copying bounds checking
  frv: add atomic64_add_unless()
  mm/mempolicy.c: do not put mempolicy before using its nodemask
  radix-tree: fix private list warnings
  Documentation/filesystems/proc.txt: add VmPin
  mm, memcg: do not retry precharge charges
  proc: add a schedule point in proc_pid_readdir()
  mm: alloc_contig: re-allow CMA to compact FS pages
  mm/slub.c: trace free objects at KERN_INFO
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>Diffstat</a> (limited to 'net/irda/irlan/Makefile')</div><table summary='diffstat' class='diffstat'>