/*
 * Squashfs - a compressed read only filesystem for Linux
 *
 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
 * Phillip Lougher <phillip@squashfs.org.uk>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * id.c
 */

/*
 * This file implements code to handle uids and gids.
 *
 * For space efficiency regular files store uid and gid indexes, which are
 * converted to 32-bit uids/gids using an id look up table.  This table is
 * stored compressed into metadata blocks.  A second index table is used to
 * locate these.  This second index table for speed of access (and because it
 * is small) is read at mount time and cached in memory.
 */

#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>

#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs.h"

/*
 * Map uid/gid index into real 32-bit uid/gid using the id look up table
 */
int squashfs_get_id(struct super_block *sb, unsigned int index,
					unsigned int *id)
{
	struct squashfs_sb_info *msblk = sb->s_fs_info;
	int block = SQUASHFS_ID_BLOCK(index);
	int offset = SQUASHFS_ID_BLOCK_OFFSET(index);
	u64 start_block = le64_to_cpu(msblk->id_table[block]);
	__le32 disk_id;
	int err;

	err = squashfs_read_metadata(sb, &disk_id, &start_block, &offset,
							sizeof(disk_id));
	if (err < 0)
		return err;

	*id = le32_to_cpu(disk_id);
	return 0;
}


/*
 * Read uncompressed id lookup table indexes from disk into memory
 */
__le64 *squashfs_read_id_index_table(struct super_block *sb,
		u64 id_table_start, u64 next_table, unsigned short no_ids)
{
	unsigned int length = SQUASHFS_ID_BLOCK_BYTES(no_ids);
	__le64 *table;

	TRACE("In read_id_index_table, length %d\n", length);

	/* Sanity check values */

	/* there should always be at least one id */
	if (no_ids == 0)
		return ERR_PTR(-EINVAL);

	/*
	 * length bytes should not extend into the next table - this check
	 * also traps instances where id_table_start is incorrectly larger
	 * than the next table start
	 */
	if (id_table_start + length > next_table)
		return ERR_PTR(-EINVAL);

	table = squashfs_read_table(sb, id_table_start, length);

	/*
	 * table[0] points to the first id lookup table metadata block, this
	 * should be less than id_table_start
	 */
	if (!IS_ERR(table) && le64_to_cpu(table[0]) >= id_table_start) {
		kfree(table);
		return ERR_PTR(-EINVAL);
	}

	return table;
}
ls/perf?id=0263d4ebd94b36280608e296cba39b924b6e832b'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util?id=0263d4ebd94b36280608e296cba39b924b6e832b'>util</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b'>cs-etm.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='0263d4ebd94b36280608e296cba39b924b6e832b'/><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 12:38:43 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 12:38:43 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b'>0263d4ebd94b36280608e296cba39b924b6e832b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=0263d4ebd94b36280608e296cba39b924b6e832b'>6e21b4b3d8e8fb12cdfcfd185d46992487265a9b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b'>tools/perf/util/cs-etm.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/cs-etm.h?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>19ca2c8fecb1592d623fe5e82d6796f8d446268d</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b&amp;id2=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/cs-etm.h?id=7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b'>7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/util/cs-etm.h?id=0263d4ebd94b36280608e296cba39b924b6e832b&amp;id2=7b9e1d89e1b6a3b99a8fdd949aa0f98dd5bf2f6b'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86</div><div class='commit-msg'>Pull x86 platform-driver fixes from Andy Shevchenko:
 "This is my first pull request since I become a co-maintainer of
  Platform Drivers x86 subsystem. It's a bit bigger than usual due to
  material collected for almost two weeks in a row.

  MAINTAINERS:
   - Add myself to X86 PLATFORM DRIVERS as a co-maintainer

  ideapad-laptop:
   - handle ACPI event 1

  intel_mid_powerbtn:
   - Set IRQ_ONESHOT

  surface3-wmi:
   - fix uninitialized symbol
   - Shut up unused-function warning

  mlx-platform:
   - free first dev on error"

* tag 'platform-drivers-x86-v4.10-4' of git://git.infradead.org/linux-platform-drivers-x86:
  MAINTAINERS: Add myself to X86 PLATFORM DRIVERS as a co-maintainer
  platform/x86: ideapad-laptop: handle ACPI event 1
  platform/x86: intel_mid_powerbtn: Set IRQ_ONESHOT
  platform/x86: surface3-wmi: fix uninitialized symbol
  platform/x86: surface3-wmi: Shut up unused-function warning
  platform/x86: mlx-platform: free first dev on error
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0263d4ebd94b36280608e296cba39b924b6e832b'>Diffstat</a> (limited to 'tools/perf/util/cs-etm.h')</div><table summary='diffstat' class='diffstat'>