diff options
Diffstat (limited to 'nuttx/fs/nxffs/nxffs_cache.c')
| -rw-r--r-- | nuttx/fs/nxffs/nxffs_cache.c | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/nuttx/fs/nxffs/nxffs_cache.c b/nuttx/fs/nxffs/nxffs_cache.c deleted file mode 100644 index 0cc97980e..000000000 --- a/nuttx/fs/nxffs/nxffs_cache.c +++ /dev/null @@ -1,261 +0,0 @@ -/**************************************************************************** - * fs/nxffs/nxffs_cache.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 <assert.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/mtd.h> - -#include "nxffs.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Public Types - ****************************************************************************/ - -/**************************************************************************** - * Public Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: nxffs_rdcache - * - * Description: - * Read one I/O block into the volume block cache memory. - * - * Input Parameters: - * volume - Describes the current volume - * block - The first logical block to read - * - * 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_rdcache(FAR struct nxffs_volume_s *volume, off_t block) -{ - size_t nxfrd; - - /* Check if the requested data is already in the cache */ - - if (block != volume->cblock) - { - /* Read the specified blocks into cache */ - - nxfrd = MTD_BREAD(volume->mtd, block, 1, volume->cache); - if (nxfrd != 1) - { - fvdbg("Read block %d failed: %d\n", block, nxfrd); - return -EIO; - } - - /* Remember what is in the cache */ - - volume->cblock = block; - } - return OK; -} - -/**************************************************************************** - * Name: nxffs_wrcache - * - * Description: - * Write one or more logical blocks from the volume cache memory. - * - * Input Parameters: - * volume - Describes the current volume - * - * Returned Value: - * Negated errnos are returned only in the case of MTD reported failures. - * - ****************************************************************************/ - -int nxffs_wrcache(FAR struct nxffs_volume_s *volume) -{ - size_t nxfrd; - - /* Write the current block from the cache */ - - nxfrd = MTD_BWRITE(volume->mtd, volume->cblock, 1, volume->cache); - if (nxfrd != 1) - { - fdbg("Write block %d failed: %d\n", volume->cblock, nxfrd); - return -EIO; - } - - /* Write was successful */ - - return OK; -} - -/**************************************************************************** - * Name: nxffs_ioseek - * - * Description: - * Seek to a position in FLASH memory. This simply sets up the offsets - * and pointer values. This is a necessary step prior to using - * nxffs_getc(). - * - * Input Parameters: - * volume - Describes the NXFFS volume - * offset - The physical offset in bytes from the beginning of the FLASH - * in bytes. - * - ****************************************************************************/ - -void nxffs_ioseek(FAR struct nxffs_volume_s *volume, off_t offset) -{ - /* Convert the offset into a block number and a byte offset into the - * block. - */ - - volume->ioblock = offset / volume->geo.blocksize; - volume->iooffset = offset - volume->geo.blocksize * volume->ioblock; -} - -/**************************************************************************** - * Name: nxffs_iotell - * - * Description: - * Report the current position. - * - * Input Parameters: - * volume - Describes the NXFFS volume - * - * Returned Value: - * The offset from the beginning of FLASH to the current seek position. - * - ****************************************************************************/ - -off_t nxffs_iotell(FAR struct nxffs_volume_s *volume) -{ - return volume->ioblock * volume->geo.blocksize + volume->iooffset; -} - -/**************************************************************************** - * Name: nxffs_getc - * - * Description: - * Get the next byte from FLASH. This function allows the data in the - * formatted FLASH blocks to be read as a continuous byte stream, skipping - * over bad blocks and block headers as necessary. - * - * Input Parameters: - * volume - Describes the NXFFS volume. The paramters ioblock and iooffset - * in the volume structure determine the behavior of nxffs_getc(). - * reserve - If less than this much space is available at the end of the - * block, then skip to the next block. - * - * Returned Value: - * Zero is returned on success. Otherwise, a negated errno indicating the - * nature of the failure. - * - ****************************************************************************/ - -int nxffs_getc(FAR struct nxffs_volume_s *volume, uint16_t reserve) -{ - int ret; - - DEBUGASSERT(reserve > 0); - - /* Loop to skip over bad blocks */ - - do - { - /* Check if we have the reserve amount at the end of the current block */ - - if (volume->iooffset + reserve > volume->geo.blocksize) - { - /* Check for attempt to read past the end of FLASH */ - - off_t nextblock = volume->ioblock + 1; - if (nextblock >= volume->nblocks) - { - fvdbg("End of FLASH encountered\n"); - return -ENOSPC; - } - - /* Set up the seek to the data just after the header in the - * next block. - */ - - volume->ioblock = nextblock; - volume->iooffset = SIZEOF_NXFFS_BLOCK_HDR; - } - - /* Make sure that the block is in the cache. The special error - * -ENOENT indicates the block was read successfully but was not - * marked as a good block. In this case we need to skip to the - * next block. All other errors are fatal. - */ - - ret = nxffs_verifyblock(volume, volume->ioblock); - if (ret < 0 && ret != -ENOENT) - { - fvdbg("Failed to read valid data into cache: %d\n", ret); - return ret; - } - } - while (ret != OK); - - /* Return the the character at this offset. Note that on return, - * iooffset could point to the byte outside of the current block. - */ - - ret = (int)volume->cache[volume->iooffset]; - volume->iooffset++; - return ret; -} |