text: /*
   * Copyright 2014-2016, Intel Corporation
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in
   *       the documentation and/or other materials provided with the
   *       distribution.
   *
   *     * Neither the name of the copyright holder nor the names of its
   *       contributors may be used to endorse or promote products derived
   *       from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * blk.h -- internal definitions for libpmem blk module
   */
  
  #define	PMEMBLK_LOG_PREFIX "libpmemblk"
  #define	PMEMBLK_LOG_LEVEL_VAR "PMEMBLK_LOG_LEVEL"
  #define	PMEMBLK_LOG_FILE_VAR "PMEMBLK_LOG_FILE"
  
  /* attributes of the blk memory pool format for the pool header */
  #define	BLK_HDR_SIG "PMEMBLK"	/* must be 8 bytes including '\0' */
  #define	BLK_FORMAT_MAJOR 1
  #define	BLK_FORMAT_COMPAT 0x0000
  #define	BLK_FORMAT_INCOMPAT 0x0000
  #define	BLK_FORMAT_RO_COMPAT 0x0000
  
  struct pmemblk {
  	struct pool_hdr hdr;	/* memory pool header */
  
  	/* root info for on-media format... */
  	uint32_t bsize;			/* block size */
  
  	/* flag indicating if the pool was zero-initialized */
  	int is_zeroed;
  
  	/* some run-time state, allocated out of memory pool... */
  	void *addr;			/* mapped region */
  	size_t size;			/* size of mapped region */
  	int is_pmem;			/* true if pool is PMEM */
  	int rdonly;			/* true if pool is opened read-only */
  	void *data;			/* post-header data area */
  	size_t datasize;		/* size of data area */
  	size_t nlba;			/* number of LBAs in pool */
  	struct btt *bttp;		/* btt handle */
  	unsigned nlane;			/* number of lanes */
  	unsigned next_lane;		/* used to rotate through lanes */
  	pthread_mutex_t *locks;		/* one per lane */
  
  #ifdef DEBUG
  	/* held during read/write mprotected sections */
  	pthread_mutex_t write_lock;
  #endif
  };
  
  /* data area starts at this alignment after the struct pmemblk above */
  #define	BLK_FORMAT_DATA_ALIGN ((uintptr_t)4096)
  