/****************************************************************************
* fs/nxffs/nxffs_dump.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <debug.h>
#include <errno.h>
#include <crc32.h>
#include <nuttx/kmalloc.h>
#include <nuttx/ioctl.h>
#include <nuttx/mtd.h>
#include "nxffs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct nxffs_blkinfo_s
{
struct mtd_geometry_s geo;
FAR uint8_t *buffer;
off_t nblocks;
off_t block;
off_t offset;
};
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxffs_analyzeinode
*
* Description:
* Analyze one candidate inode found in the block.
*
****************************************************************************/
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_FS)
static inline ssize_t nxffs_analyzeinode(FAR struct nxffs_blkinfo_s *blkinfo,
int offset)
{
FAR struct nxffs_inode_s inode;
off_t nextblock;
uint8_t state;
uint32_t noffs;
uint32_t doffs;
uint32_t utc;
uint32_t ecrc;
uint32_t datlen;
uint32_t crc;
size_t spaceleft;
/* Verify that there is space for an inode header remaining in the block */
if (offset + SIZEOF_NXFFS_INODE_HDR > blkinfo->geo.blocksize)
{
/* No.. then this can't be an inode header */
return ERROR;
}
/* Unpack the header */
memcpy(&inode, &blkinfo->buffer[offset], SIZEOF_NXFFS_INODE_HDR);
noffs = nxffs_rdle32(inode.noffs);
doffs = nxffs_rdle32(inode.doffs);
utc = nxffs_rdle32(inode.utc);
ecrc = nxffs_rdle32(inode.crc);
datlen = nxffs_rdle32(inode.datlen);
/* Misc. sanity checks */
if (noffs < blkinfo->offset + offset + SIZEOF_NXFFS_BLOCK_HDR)
{
/* The name begins before the inode header. This can't can't be
* a real inode header (or it is a corrupted one).
*/
return ERROR;
}
/* Can we verify the inode? We need to have the inode name in the same
* block to do that (or get access to the next block)
*/
if (doffs < blkinfo->offset + offset + SIZEOF_NXFFS_BLOCK_HDR)
{
/* The first data block begins before the inode header. This can't can't
* be a real inode header (or it is a corrupted one).
*/
return ERROR;
}
spaceleft = (blkinfo->nblocks - blkinfo->block) * blkinfo->geo.blocksize;
spaceleft -= (offset + SIZEOF_NXFFS_BLOCK_HDR);
if (datlen > spaceleft)
{
/* The data length is greater than what would fit in the rest of FLASH
* (even ignoring block and data header sizes.
*/
return ERROR;
}
/* The name begins after the inode header. Does it begin in this block? */
nextblock = blkinfo->offset + blkinfo->geo.blocksize;
if (noffs > nextblock)
{
/* Not than we cannot verify the inode header */
fdbg(" Block %d:%d: Unverifiable inode, datlen: %d\n",
blkinfo->block, offset, datlen);
return ERROR;
}
/* The name begins in this block. Does it also end in this block? */
if (noffs + inode.namlen > nextblock)
{
/* No.. Assume that this is not an inode. */
return ERROR;
}
/* Calculate the CRC */
state = inode.state;
inode.state = CONFIG_NXFFS_ERASEDSTATE;
nxffs_wrle32(inode.crc, 0);
crc = crc32((FAR const uint8_t *)&inode, SIZEOF_NXFFS_INODE_HDR);
crc = crc32part(&blkinfo->buffer[noffs - blkinfo->offset], inode.namlen, crc);
if (crc != ecrc)
{
fdbg(" Block %d:%d: Potential inode with bad CRC, datlen: %d\n",
blkinfo->block, offset, datlen);
return ERROR;
}
/* If must be a good header */
if (state == INODE_STATE_FILE)
{
fdbg(" Block %d:%d: Verified FILE inode, datlen: %d\n",
blkinfo->block, offset, datlen);
}
else if (state == INODE_STATE_DELETED)
{
fdbg(" Block %d:%d: Verified DELETED inode, datlen: %d\n",
blkinfo->block, offset, datlen);
}
else
{
fdbg(" Block %d:%d: Verified inode with CORRUPTED state, datlen: %d\n",
blkinfo->block, offset, datlen);
}
return noffs + inode.namlen - offset;
}
#endif
/****************************************************************************
* Name: nxffs_analyzedata
*
* Description:
* Analyze one candidate inode found in the block.
*
****************************************************************************/
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_FS)
static inline ssize_t nxffs_analyzedata(FAR struct nxffs_blkinfo_s *blkinfo,
int offset)
{
struct nxffs_data_s dathdr;
uint32_t ecrc;
uint16_t datlen;
uint32_t crc;
/* Copy and unpack the data block header */
memcpy(&dathdr, &blkinfo->buffer[offset], SIZEOF_NXFFS_DATA_HDR);
ecrc = nxffs_rdle32(dathdr.crc);
datlen = nxffs_rdle16(dathdr.datlen);
/* Sanity checks */
if (offset + SIZEOF_NXFFS_DATA_HDR + datlen > blkinfo->geo.blocksize)
{
/* Data does not fit in within the block, this can't be a data block */
return ERROR;
}
/* Calculate the CRC */
nxffs_wrle32(dathdr.crc, 0);
crc = crc32((FAR const uint8_t *)&dathdr, SIZEOF_NXFFS_DATA_HDR);
crc = crc32part(&blkinfo->buffer[offset + SIZEOF_NXFFS_DATA_HDR], datlen, crc);
if (crc != ecrc)
{
fdbg(" Block %d:%d: Potential data block with bad CRC, datlen: %d\n",
blkinfo->block, offset, datlen);
return ERROR;
}
/* If must be a good header */
fdbg(" Block %d:%d: Verified data block, datlen: %d\n",
blkinfo->block, offset, datlen);
return SIZEOF_NXFFS_DATA_HDR + datlen;
}
#endif
/****************************************************************************
* Name: nxffs_analyze
*
* Description:
* Analyze the content of one block.
*
****************************************************************************/
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_FS)
static inline void nxffs_analyze(FAR struct nxffs_blkinfo_s *blkinfo)
{
FAR struct nxffs_block_s *blkhdr;
ssize_t nbytes;
int hdrndx;
int datndx;
int inndx;
int nerased;
int i;
/* Verify that there is a header on the block */
blkhdr = (FAR struct nxffs_block_s *)blkinfo->buffer;
if (memcmp(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE) != 0)
{
fdbg(" Block %d:0: ERROR -- no header\n", blkinfo->block);
}
else if (blkhdr->state == BLOCK_STATE_BAD)
{
fdbg(" Block %d:0: BAD\n", blkinfo->block);
}
else if (blkhdr->state != BLOCK_STATE_GOOD)
{
fdbg(" Block %d:0: ERROR -- bad state\n", blkinfo->block);
}
/* Serach for Inode and data block headers. */
inndx = 0;
datndx = 0;
for (i = SIZEOF_NXFFS_BLOCK_HDR; i < blkinfo->geo.blocksize; i++)
{
uint8_t ch = blkinfo->buffer[i];
if (ch == CONFIG_NXFFS_ERASEDSTATE)
{
nerased++;
}
else if (ch == g_inodemagic[inndx])
{
inndx++;
datndx = 0;
if (inndx == NXFFS_MAGICSIZE)
{
hdrndx = i - NXFFS_MAGICSIZE + 1;
nbytes = nxffs_analyzeinode(blkinfo, hdrndx);
if (nbytes > 0)
{
i = hdrndx + nbytes;
}
}
}
else if (ch == g_datamagic[datndx])
{
datndx++;
inndx = 0;
if (datndx == NXFFS_MAGICSIZE)
{
hdrndx = i - NXFFS_MAGICSIZE + 1;
nbytes = nxffs_analyzedata(blkinfo, hdrndx);
nbytes = nxffs_analyzeinode(blkinfo, hdrndx);
if (nbytes > 0)
{
i = hdrndx + nbytes;
}
}
}
}
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxffs_dump
*
* Description:
* Dump a summary of the contents of an NXFFS file system. CONFIG_DEBUG
* and CONFIG_DEBUG_FS must be enabled for this function to do anything.
*
* Input Parameters:
* mtd - The MTD device that provides the interface to NXFFS-formatted media.
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int nxffs_dump(FAR struct mtd_dev_s *mtd)
{
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_FS)
struct nxffs_blkinfo_s blkinfo;
int ret;
/* Get the volume geometry. (casting to uintptr_t first eliminates
* complaints on some architectures where the sizeof long is different
* from the size of a pointer).
*/
memset(&blkinfo, 0, sizeof(struct nxffs_blkinfo_s));
ret = MTD_IOCTL(mtd, MTDIOC_GEOMETRY, (unsigned long)((uintptr_t)&blkinfo.geo));
if (ret < 0)
{
fdbg("MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", -ret);
goto errout;
}
/* Allocate a buffer to hold one block */
blkinfo.buffer = (FAR uint8_t *)kmalloc(blkinfo.geo.blocksize);
if (!blkinfo.buffer)
{
fdbg("Failed to allocate block cache\n");
ret = -ENOMEM;
goto errout;
}
/* Now read every block on the device */
fdbg("NXFFS Dump:\n");
blkinfo.nblocks = blkinfo.geo.erasesize * blkinfo.geo.neraseblocks / blkinfo.geo.blocksize;
for (blkinfo.block = 0, blkinfo.offset = 0;
blkinfo.block < blkinfo.nblocks;
blkinfo.block++, blkinfo.offset += blkinfo.geo.blocksize)
{
/* Read the next block */
ret = MTD_BREAD(mtd, blkinfo.block, 1, blkinfo.buffer);
if (ret < 0)
{
fdbg("Failed to read block %d\n", blkinfo.block);
goto errout_with_block;
}
/* Analyze the block */
nxffs_analyze(&blkinfo);
}
fdbg("%d blocks analyzed\n", blkinfo.nblocks);
errout_with_block:
kfree(blkinfo.buffer);
errout:
return ret;
#else
return -ENOSYS;
#endif
}
