/*
 *  linux/fs/ext4/bitmap.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 */

#include <linux/buffer_head.h>
#include "ext4.h"

unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
{
	return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
}

int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
				  struct ext4_group_desc *gdp,
				  struct buffer_head *bh, int sz)
{
	__u32 hi;
	__u32 provided, calculated;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (!ext4_has_metadata_csum(sb))
		return 1;

	provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
	calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
	if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
		hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
		provided |= (hi << 16);
	} else
		calculated &= 0xFFFF;

	return provided == calculated;
}

void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
				struct ext4_group_desc *gdp,
				struct buffer_head *bh, int sz)
{
	__u32 csum;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (!ext4_has_metadata_csum(sb))
		return;

	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
	gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
	if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
		gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
}

int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
				  struct ext4_group_desc *gdp,
				  struct buffer_head *bh)
{
	__u32 hi;
	__u32 provided, calculated;
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;

	if (!ext4_has_metadata_csum(sb))
		return 1;

	provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
	calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
	if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
		hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
		provided |= (hi << 16);
	} else
		calculated &= 0xFFFF;

	if (provided == calculated)
		return 1;

	return 0;
}

void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
				struct ext4_group_desc *gdp,
				struct buffer_head *bh)
{
	int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
	__u32 csum;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (!ext4_has_metadata_csum(sb))
		return;

	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
	gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
	if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
		gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
}
t</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>usb</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='35eeacf1820a08305c2b0960febfa190f5a6dd63'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option 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>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-11 02:31:11 -0500</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-11 02:31:11 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>35eeacf1820a08305c2b0960febfa190f5a6dd63</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>f1227c7384ee01d3f029cc5f82223234e6456c5f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>drivers/usb</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=bed45f79a2afc9d7c279b880dfcac8f27d513b50'>bed45f79a2afc9d7c279b880dfcac8f27d513b50</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63&amp;id2=bed45f79a2afc9d7c279b880dfcac8f27d513b50'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=1ee18329fae936089c6c599250ae92482ff2b81f'>1ee18329fae936089c6c599250ae92482ff2b81f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb?id=35eeacf1820a08305c2b0960febfa190f5a6dd63&amp;id2=1ee18329fae936089c6c599250ae92482ff2b81f'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>Diffstat</a> (limited to 'drivers/usb')</div><table summary='diffstat' class='diffstat'>