/*
 *  linux/fs/ext4/symlink.c
 *
 * Only fast symlinks left here - the rest is done by generic code. AV, 1999
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/symlink.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext4 symlink handling code
 */

#include <linux/fs.h>
#include <linux/namei.h>
#include "ext4.h"
#include "xattr.h"

static const char *ext4_encrypted_get_link(struct dentry *dentry,
					   struct inode *inode,
					   struct delayed_call *done)
{
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
	struct fscrypt_str cstr, pstr;
	struct fscrypt_symlink_data *sd;
	int res;
	u32 max_size = inode->i_sb->s_blocksize;

	if (!dentry)
		return ERR_PTR(-ECHILD);

	res = fscrypt_get_encryption_info(inode);
	if (res)
		return ERR_PTR(res);

	if (ext4_inode_is_fast_symlink(inode)) {
		caddr = (char *) EXT4_I(inode)->i_data;
		max_size = sizeof(EXT4_I(inode)->i_data);
	} else {
		cpage = read_mapping_page(inode->i_mapping, 0, NULL);
		if (IS_ERR(cpage))
			return ERR_CAST(cpage);
		caddr = page_address(cpage);
	}

	/* Symlink is encrypted */
	sd = (struct fscrypt_symlink_data *)caddr;
	cstr.name = sd->encrypted_path;
	cstr.len  = le16_to_cpu(sd->len);
	if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
		/* Symlink data on the disk is corrupted */
		res = -EFSCORRUPTED;
		goto errout;
	}

	res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
	if (res)
		goto errout;
	paddr = pstr.name;

	res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
	if (res)
		goto errout;

	/* Null-terminate the name */
	paddr[pstr.len] = '\0';
	if (cpage)
		put_page(cpage);
	set_delayed_call(done, kfree_link, paddr);
	return paddr;
errout:
	if (cpage)
		put_page(cpage);
	kfree(paddr);
	return ERR_PTR(res);
}

const struct inode_operations ext4_encrypted_symlink_inode_operations = {
	.get_link	= ext4_encrypted_get_link,
	.setattr	= ext4_setattr,
	.listxattr	= ext4_listxattr,
};

const struct inode_operations ext4_symlink_inode_operations = {
	.get_link	= page_get_link,
	.setattr	= ext4_setattr,
	.listxattr	= ext4_listxattr,
};

const struct inode_operations ext4_fast_symlink_inode_operations = {
	.get_link	= simple_get_link,
	.setattr	= ext4_setattr,
	.listxattr	= ext4_listxattr,
};
right' method='get' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/serial/usb-wwan.h'>
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<option value='grep'>log msg</option>
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</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>serial</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/usb-wwan.h?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>usb-wwan.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='aaaec6fc755447a1d056765b11b24d8ff2b81366'/><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>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 19:03:21 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 20:22:18 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/usb-wwan.h?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>aaaec6fc755447a1d056765b11b24d8ff2b81366</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/serial/usb-wwan.h?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>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=aaaec6fc755447a1d056765b11b24d8ff2b81366'>a7f4167960ee1df86739905b6ccdeb95465bfe5f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/serial/usb-wwan.h?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>drivers/usb/serial/usb-wwan.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/usb-wwan.h?h=nds-private-remove&amp;id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>08d85f3ea99f1eeafc4e8507936190e86a16ee8c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/usb-wwan.h?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366&amp;id2=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/irq: Make irq activate operations symmetric</div><div class='commit-msg'>The recent commit which prevents double activation of interrupts unearthed
interesting code in x86. The code (ab)uses irq_domain_activate_irq() to
reconfigure an already activated interrupt. That trips over the prevention
code now.

Fix it by deactivating the interrupt before activating the new configuration.

Fixes: 08d85f3ea99f1 "irqdomain: Avoid activating interrupts more than once"
Reported-and-tested-by: Mike Galbraith &lt;efault@gmx.de&gt;
Reported-and-tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Andrey Ryabinin &lt;aryabinin@virtuozzo.com&gt;
Cc: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701311901580.3457@nanos

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>Diffstat</a> (limited to 'drivers/usb/serial/usb-wwan.h')</div><table summary='diffstat' class='diffstat'>