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nuttx/fs/nxffs/nxffs_blockstats.c

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/****************************************************************************
* fs/nxffs/nxffs_blockstats.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References: Linux/Documentation/filesystems/romfs.txt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/mtd/mtd.h>
#include "nxffs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxffs_blockstats
*
* Description:
* Analyze the NXFFS volume. This operation must be performed when the
* volume is first mounted in order to detect if the volume has been
* formatted and contains a usable NXFFS file system.
*
* Input Parameters:
* volume - Describes the current NXFFS volume.
* stats - On return, will hold nformation describing the state of the
* volume.
*
* Returned Value:
* Negated errnos are returned only in the case of MTD reported failures.
* Nothing in the volume data itself will generate errors.
*
****************************************************************************/
int nxffs_blockstats(FAR struct nxffs_volume_s *volume,
FAR struct nxffs_blkstats_s *stats)
{
#ifndef CONFIG_NXFFS_NAND
FAR uint8_t *bptr; /* Pointer to next block data */
int lblock; /* Logical block index */
#endif
off_t ioblock; /* I/O block number */
int ret;
/* Process each erase block */
memset(stats, 0, sizeof(struct nxffs_blkstats_s));
#ifndef CONFIG_NXFFS_NAND
for (ioblock = 0; ioblock < volume->nblocks; ioblock += volume->blkper)
{
/* Read the full erase block */
ret = MTD_BREAD(volume->mtd, ioblock, volume->blkper, volume->pack);
if (ret < volume->blkper)
{
fdbg("ERROR: Failed to read erase block %d: %d\n",
ioblock / volume->blkper, ret);
return ret;
}
/* Then examine each logical block in the erase block */
for (bptr = volume->pack, lblock = 0;
lblock < volume->blkper;
bptr += volume->geo.blocksize, lblock++)
{
/* We read the block successfully, now check for errors tagged
* in the NXFFS data.
*/
FAR struct nxffs_block_s *blkhdr = (FAR struct nxffs_block_s*)bptr;
/* Increment the total count of blocks examined */
stats->nblocks++;
/* Collect statistics */
/* Check if this is a block that should be recognized by NXFFS */
if (memcmp(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE) != 0)
{
/* Nope.. block must not be formatted */
stats->nunformat++;
}
else if (blkhdr->state == BLOCK_STATE_BAD)
{
/* The block is marked as bad */
stats->nbad++;
}
else if (blkhdr->state == BLOCK_STATE_GOOD)
{
/* The block is marked as good */
stats-> ngood++;
}
else
{
/* The good/bad mark is not recognized. Let's call this
* corrupt (vs. unformatted).
*/
stats->ncorrupt++;
}
}
}
fdbg("Number blocks: %d\n", stats->nblocks);
fdbg(" Good blocks: %d\n", stats->ngood);
fdbg(" Bad blocks: %d\n", stats->nbad);
fdbg(" Unformatted blocks: %d\n", stats->nunformat);
fdbg(" Corrupt blocks: %d\n", stats->ncorrupt);
#else
for (ioblock = 0; ioblock < volume->nblocks; ioblock++)
{
/* Increment the total count of blocks examined */
stats->nblocks++;
/* Read each logical block, one at a time. We could read all of the
* blocks in the erase block into volume->pack at once. But this would
* be a problem for NAND which may generate read errors due to bad ECC
* on individual blocks.
*/
ret = MTD_BREAD(volume->mtd, ioblock, 1, volume->pack);
if (ret < 1)
{
/* This should not happen at all on most kinds of FLASH. But a
* bad read will happen normally with a NAND device that has
* uncorrectable blocks. So, just for NAND, we keep the count
* of unreadable blocks.
*/
fdbg("ERROR: Failed to read block %d: %d\n", ioblock, ret);
/* Increment the count of un-readable blocks */
stats->nbadread++;
}
else
{
/* We read the block successfully, now check for errors tagged
* in the NXFFS data.
*/
FAR struct nxffs_block_s *blkhdr = (FAR struct nxffs_block_s*)volume->pack;
/* Collect statistics */
/* Check if this is a block that should be recognized by NXFFS */
if (memcmp(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE) != 0)
{
/* Nope.. block must not be formatted */
stats->nunformat++;
}
else if (blkhdr->state == BLOCK_STATE_BAD)
{
/* The block is marked as bad */
stats->nbad++;
}
else if (blkhdr->state == BLOCK_STATE_GOOD)
{
/* The block is marked as good */
stats-> ngood++;
}
else
{
/* The good/bad mark is not recognized. Let's call this
* corrupt (vs. unformatted).
*/
stats->ncorrupt++;
}
}
}
fdbg("Number blocks: %d\n", stats->nblocks);
fdbg(" Good blocks: %d\n", stats->ngood);
fdbg(" Bad blocks: %d\n", stats->nbad);
fdbg(" Unformatted blocks: %d\n", stats->nunformat);
fdbg(" Corrupt blocks: %d\n", stats->ncorrupt);
fdbg(" Unreadable blocks: %d\n", stats->nbadread);
#endif
return OK;
}
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