/*
 *  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);
}
on>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/gpio?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>gpio</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>tegra186-gpio.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='19ca2c8fecb1592d623fe5e82d6796f8d446268d'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 12:21:51 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 12:21:51 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>19ca2c8fecb1592d623fe5e82d6796f8d446268d</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>0756e115d125846f46b302085307768f069434a1</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>include/dt-bindings/gpio/tegra186-gpio.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/gpio/tegra186-gpio.h?id=a4685d2f58e2230d4e27fb2ee581d7ea35e5d046'>a4685d2f58e2230d4e27fb2ee581d7ea35e5d046</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d&amp;id2=a4685d2f58e2230d4e27fb2ee581d7ea35e5d046'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/gpio/tegra186-gpio.h?id=880a38547ff08715ce4f1daf9a4bb30c87676e68'>880a38547ff08715ce4f1daf9a4bb30c87676e68</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/gpio/tegra186-gpio.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d&amp;id2=880a38547ff08715ce4f1daf9a4bb30c87676e68'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace</div><div class='commit-msg'>Pull namespace fix from Eric Biederman:
 "This has a single brown bag fix.

  The possible deadlock with dec_pid_namespaces that I had thought was
  fixed earlier turned out only to have been moved. So instead of being
  cleaver this change takes ucounts_lock with irqs disabled. So
  dec_ucount can be used from any context without fear of deadlock.

  The items accounted for dec_ucount and inc_ucount are all
  comparatively heavy weight objects so I don't exepct this will have
  any measurable performance impact"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  userns: Make ucounts lock irq-safe
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>Diffstat</a> (limited to 'include/dt-bindings/gpio/tegra186-gpio.h')</div><table summary='diffstat' class='diffstat'>