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Revision f52afc93cd018fe6910133a05d44671192d1aeb0 authored by Jan Kara on 27 September 2018, 11:23:32 UTC, committed by Dan Williams on 27 September 2018, 17:56:15 UTC 
dax: Fix deadlock in dax_lock_mapping_entry()
 
When dax_lock_mapping_entry() has to sleep to obtain entry lock, it will
fail to unlock mapping->i_pages spinlock and thus immediately deadlock
against itself when retrying to grab the entry lock again. Fix the
problem by unlocking mapping->i_pages before retrying.

Fixes: c2a7d2a11552 ("filesystem-dax: Introduce dax_lock_mapping_entry()")
Reported-by: Barret Rhoden <brho@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1 parent 6bf4ca7
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trusted-type.h 
/*
 * Copyright (C) 2010 IBM Corporation
 * Author: David Safford <safford@us.ibm.com>
 *
 * 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, version 2 of the License.
 */

#ifndef _KEYS_TRUSTED_TYPE_H
#define _KEYS_TRUSTED_TYPE_H

#include <linux/key.h>
#include <linux/rcupdate.h>
#include <linux/tpm.h>

#define MIN_KEY_SIZE			32
#define MAX_KEY_SIZE			128
#define MAX_BLOB_SIZE			512
#define MAX_PCRINFO_SIZE		64
#define MAX_DIGEST_SIZE			64

struct trusted_key_payload {
	struct rcu_head rcu;
	unsigned int key_len;
	unsigned int blob_len;
	unsigned char migratable;
	unsigned char key[MAX_KEY_SIZE + 1];
	unsigned char blob[MAX_BLOB_SIZE];
};

struct trusted_key_options {
	uint16_t keytype;
	uint32_t keyhandle;
	unsigned char keyauth[TPM_DIGEST_SIZE];
	unsigned char blobauth[TPM_DIGEST_SIZE];
	uint32_t pcrinfo_len;
	unsigned char pcrinfo[MAX_PCRINFO_SIZE];
	int pcrlock;
	uint32_t hash;
	uint32_t policydigest_len;
	unsigned char policydigest[MAX_DIGEST_SIZE];
	uint32_t policyhandle;
};

extern struct key_type key_type_trusted;

#endif /* _KEYS_TRUSTED_TYPE_H */
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