/*
 * 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.
 *
 * symlink.c
 */

/*
 * This file implements code to handle symbolic links.
 *
 * The data contents of symbolic links are stored inside the symbolic
 * link inode within the inode table.  This allows the normally small symbolic
 * link to be compressed as part of the inode table, achieving much greater
 * compression than if the symbolic link was compressed individually.
 */

#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>

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

static int squashfs_symlink_readpage(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	struct super_block *sb = inode->i_sb;
	struct squashfs_sb_info *msblk = sb->s_fs_info;
	int index = page->index << PAGE_SHIFT;
	u64 block = squashfs_i(inode)->start;
	int offset = squashfs_i(inode)->offset;
	int length = min_t(int, i_size_read(inode) - index, PAGE_SIZE);
	int bytes, copied;
	void *pageaddr;
	struct squashfs_cache_entry *entry;

	TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
			"%llx, offset %x\n", page->index, block, offset);

	/*
	 * Skip index bytes into symlink metadata.
	 */
	if (index) {
		bytes = squashfs_read_metadata(sb, NULL, &block, &offset,
								index);
		if (bytes < 0) {
			ERROR("Unable to read symlink [%llx:%x]\n",
				squashfs_i(inode)->start,
				squashfs_i(inode)->offset);
			goto error_out;
		}
	}

	/*
	 * Read length bytes from symlink metadata.  Squashfs_read_metadata
	 * is not used here because it can sleep and we want to use
	 * kmap_atomic to map the page.  Instead call the underlying
	 * squashfs_cache_get routine.  As length bytes may overlap metadata
	 * blocks, we may need to call squashfs_cache_get multiple times.
	 */
	for (bytes = 0; bytes < length; offset = 0, bytes += copied) {
		entry = squashfs_cache_get(sb, msblk->block_cache, block, 0);
		if (entry->error) {
			ERROR("Unable to read symlink [%llx:%x]\n",
				squashfs_i(inode)->start,
				squashfs_i(inode)->offset);
			squashfs_cache_put(entry);
			goto error_out;
		}

		pageaddr = kmap_atomic(page);
		copied = squashfs_copy_data(pageaddr + bytes, entry, offset,
								length - bytes);
		if (copied == length - bytes)
			memset(pageaddr + length, 0, PAGE_SIZE - length);
		else
			block = entry->next_index;
		kunmap_atomic(pageaddr);
		squashfs_cache_put(entry);
	}

	flush_dcache_page(page);
	SetPageUptodate(page);
	unlock_page(page);
	return 0;

error_out:
	SetPageError(page);
	unlock_page(page);
	return 0;
}


const struct address_space_operations squashfs_symlink_aops = {
	.readpage = squashfs_symlink_readpage
};

const struct inode_operations squashfs_symlink_inode_ops = {
	.get_link = page_get_link,
	.listxattr = squashfs_listxattr
};

input type='hidden' name='id' value='228c8c6b1f4376788e9d5ab00d50b10228eb40d3'/><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>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-01-26 17:15:44 +0100</td></tr>
<tr><th>committer</th><td>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-01-26 18:03:09 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/wm8350.c?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>228c8c6b1f4376788e9d5ab00d50b10228eb40d3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/codecs/wm8350.c?id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>dfd7010fa9480284fe72bb2c4ab50a5225792a10</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/codecs/wm8350.c?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>sound/soc/codecs/wm8350.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/wm8350.c?h=nds-private-remove&amp;id=731977e97b3697454a862fec656c2561eabc0b87'>731977e97b3697454a862fec656c2561eabc0b87</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs/wm8350.c?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3&amp;id2=731977e97b3697454a862fec656c2561eabc0b87'>diff</a>)</td></tr></table>
<div class='commit-subject'>wireless: define cipher/AKM suites using a macro</div><div class='commit-msg'>The spec writes cipher/AKM suites as something like 00-0F-AC:9,
but the part after the colon isn't hex, it's decimal, so that
we've already had a few mistakes (in other code, or unmerged
patches) to e.g. write 0x000FAC10 instead of 0x000FAC0A.

Use a macro to avoid that problem.

Reviewed-by: Luca Coelho &lt;luciano.coelho@intel.com&gt;
Signed-off-by: Johannes Berg &lt;johannes.berg@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>Diffstat</a> (limited to 'sound/soc/codecs/wm8350.c')</div><table summary='diffstat' class='diffstat'>