2fe4ad52f8
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4499 42af7a65-404d-4744-a932-0658087f49c3
1084 lines
39 KiB
C
1084 lines
39 KiB
C
/****************************************************************************
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* fs/nxffs/nxffs.h
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References: Linux/Documentation/filesystems/romfs.txt
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __FS_NXFFS_NXFFS_H
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#define __FS_NXFFS_NXFFS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <semaphore.h>
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#include <nuttx/mtd.h>
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#include <nuttx/fs/nxffs.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* NXFFS Definitions ********************************************************/
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/* General NXFFS organization. The following example assumes 4 logical
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* blocks per FLASH erase block. The actual relationship is determined by
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* the FLASH geometry reported by the MTD driver.
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*
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* ERASE LOGICAL Inodes begin with a inode header. inode may
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* BLOCK BLOCK CONTENTS be marked as "deleted," pending re-packing.
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* n 4*n --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* |IIIIIIIIIIIIII| Inodes begin with a inode header
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* |DDDDDDDDDDDDDD| Data block containing inode data block
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* | (Inode Data) |
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* 4*n+1 --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* |DDDDDDDDDDDDDD| Inodes may consist of multiple data blocks
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* | (Inode Data) |
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* |IIIIIIIIIIIIII| Next inode header
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* | | Possibly a few unused bytes at the end of a block
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* 4*n+2 --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* |DDDDDDDDDDDDDD|
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* | (Inode Data) |
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* 4*n+3 --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* |IIIIIIIIIIIIII| Next inode header
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* |DDDDDDDDDDDDDD|
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* | (Inode Data) |
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* n+1 4*(n+1) --+--------------+
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* |BBBBBBBBBBBBBB| Logic block header
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* | | All FLASH is unused after the end of the final
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* | | inode.
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* --+--------------+
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*
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* General operation:
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* Inodes are written starting at the beginning of FLASH. As inodes are
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* deleted, they are marked as deleted but not removed. As new inodes are
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* written, allocations proceed to toward the end of the FLASH -- thus,
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* supporting wear leveling by using all FLASH blocks equally.
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*
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* When the FLASH becomes full (no more space at the end of the FLASH), a
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* re-packing operation must be performed: All inodes marked deleted are
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* finally removed and the remaining inodes are packed at the beginning of
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* the FLASH. Allocations then continue at the freed FLASH memory at the
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* end of the FLASH.
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*
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* BLOCK HEADER:
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* The block header is used to determine if the block has every been
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* formatted and also indicates bad blocks which should never be used.
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*
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* INODE HEADER:
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* Each inode begins with an inode header that contains, among other things,
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* the name of the inode, the offset to the first data block, and the
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* length of the inode data.
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*
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* At present, the only kind of inode support is a file. So for now, the
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* term file and inode are interchangeable.
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*
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* INODE DATA HEADER:
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* Inode data is enclosed in a data header. For a given inode, there
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* is at most one inode data block per logical block. If the inode data
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* spans more than one logical block, then the inode data may be enclosed
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* in multiple data blocks, one per logical block.
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*
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* NXFFS Limitations:
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* 1. Since the files are contiguous in FLASH and since allocations always
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* proceed toward the end of the FLASH, there can only be one file opened
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* for writing at a time. Multiple files may be opened for reading.
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* 2. Files may not be increased in size after they have been closed. The
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* O_APPEND open flag is not supported.
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* 3. Files are always written sequential. Seeking within a file opened for
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* writing will not work.
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* 4. There are no directories, however, '/' may be used within a file name
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* string providing some illusion of directories.
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* 5. Files may be opened for reading or for writing, but not both: The O_RDWR
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* open flag is not supported.
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* 6. The re-packing process occurs only during a write when the free FLASH
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* memory at the end of the FLASH is exhausted. Thus, occasionally, file
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* writing may take a long time.
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* 7. Another limitation is that there can be only a single NXFFS volume
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* mounted at any time. This has to do with the fact that we bind to
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* an MTD driver (instead of a block driver) and bypass all of the normal
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* mount operations.
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*/
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/* Values for logical block state. Basically, there are only two, perhaps
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* three, states:
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*
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* BLOCK_STATE_GOOD - The block is not known to be bad.
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* BLOCK_STATE_BAD - An error was found on the block and it is marked bad.
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* Other values - The block is bad and has an invalid state.
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*
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* Care is taken so that the GOOD to BAD transition only involves burning
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* bits from the erased to non-erased state.
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*/
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#define BLOCK_STATE_GOOD (CONFIG_NXFFS_ERASEDSTATE ^ 0x44)
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#define BLOCK_STATE_BAD (CONFIG_NXFFS_ERASEDSTATE ^ 0x55)
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/* Values for NXFFS inode state. Similar there are 2 (maybe 3) inode states:
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*
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* INODE_STATE_FILE - The inode is a valid usuable, file
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* INODE_STATE_DELETED - The inode has been deleted.
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* Other values - The inode is bad and has an invalid state.
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*
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* Care is taken so that the VALID to DELETED transition only involves burning
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* bits from the erased to non-erased state.
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*/
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#define INODE_STATE_FILE (CONFIG_NXFFS_ERASEDSTATE ^ 0x22)
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#define INODE_STATE_DELETED (CONFIG_NXFFS_ERASEDSTATE ^ 0xaa)
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/* Number of bytes in an the NXFFS magic sequences */
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#define NXFFS_MAGICSIZE 4
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/* When we allocate FLASH for a new inode data block, we will require that
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* space is available to hold this minimum number of data bytes in addition
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* to the size of the data block headeer.
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*/
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#define NXFFS_MINDATA 16
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/* Internal definitions *****************************************************/
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/* If we encounter this number of erased bytes, we assume that all of the
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* flash beyond this point is erased.
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*/
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#define NXFFS_NERASED 128
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/* Quasi-standard definitions */
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#ifndef MIN
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# define MIN(a,b) (a < b ? a : b)
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#endif
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#ifndef MAX
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# define MAX(a,b) (a > b ? a : b)
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This structure defines each packed block on the FLASH media */
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struct nxffs_block_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid block */
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uint8_t state; /* 4: Block state: See BLOCK_STATE_* */
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};
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#define SIZEOF_NXFFS_BLOCK_HDR 5
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/* This structure defines each packed NXFFS inode header on the FLASH media */
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struct nxffs_inode_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid inode */
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uint8_t state; /* 4: Inode state: See INODE_STATE_* */
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uint8_t namlen; /* 5: Length of the inode name */
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uint8_t noffs[4]; /* 6-9: FLASH offset to the file name */
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uint8_t doffs[4]; /* 10-13: FLASH offset to the first data block */
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uint8_t utc[4]; /* 14-17: Creation time */
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uint8_t crc[4]; /* 18-21: CRC32 */
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uint8_t datlen[4]; /* 22-25: Length of data in bytes */
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};
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#define SIZEOF_NXFFS_INODE_HDR 26
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/* This structure defines each packed NXFFS data header on the FLASH media */
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struct nxffs_data_s
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{
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uint8_t magic[4]; /* 0-3: Magic number for valid data */
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uint8_t crc[4]; /* 4-7: CRC32 */
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uint8_t datlen[2]; /* 8-9: Length of data in bytes */
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};
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#define SIZEOF_NXFFS_DATA_HDR 10
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/* This is an in-memory representation of the NXFFS inode as extracted from
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* FLASH and with additional state information.
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*/
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struct nxffs_entry_s
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{
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off_t hoffset; /* FLASH offset to the inode header */
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off_t noffset; /* FLASH offset to the inode name */
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off_t doffset; /* FLASH offset to the first data header */
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FAR char *name; /* inode name */
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uint32_t utc; /* Time stamp */
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uint32_t datlen; /* Length of inode data */
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};
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/* This structure describes int in-memory representation of the data block */
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struct nxffs_blkentry_s
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{
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off_t hoffset; /* Offset to the block data header */
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uint16_t datlen; /* Length of data following the header */
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uint16_t foffset; /* Offset to start of data */
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};
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/* This structure describes the state of one open file. This structure
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* is protected by the volume semaphore.
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*/
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struct nxffs_ofile_s
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{
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struct nxffs_ofile_s *flink; /* Supports a singly linked list */
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int16_t crefs; /* Reference count */
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mode_t oflags; /* Open mode */
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struct nxffs_entry_s entry; /* Describes the NXFFS inode entry */
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};
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/* A file opened for writing require some additional information */
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struct nxffs_wrfile_s
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{
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/* The following fields provide the common open file information. */
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struct nxffs_ofile_s ofile;
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/* The following fields are required to support the write operation */
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bool truncate; /* Delete a file of the same name */
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uint16_t datlen; /* Number of bytes written in data block */
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off_t doffset; /* FLASH offset to the current data header */
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uint32_t crc; /* Accumulated data block CRC */
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};
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/* This structure represents the overall state of on NXFFS instance. */
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struct nxffs_volume_s
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{
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FAR struct mtd_dev_s *mtd; /* Supports FLASH access */
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sem_t exclsem; /* Used to assure thread-safe access */
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sem_t wrsem; /* Enforces single writer restriction */
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struct mtd_geometry_s geo; /* Device geometry */
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uint8_t blkper; /* R/W blocks per erase block */
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uint16_t iooffset; /* Next offset in read/write access (in ioblock) */
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off_t inoffset; /* Offset to the first valid inode header */
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off_t froffset; /* Offset to the first free byte */
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off_t nblocks; /* Number of R/W blocks on volume */
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off_t ioblock; /* Current block number being accessed */
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off_t cblock; /* Starting block number in cache */
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FAR struct nxffs_ofile_s *ofiles; /* A singly-linked list of open files */
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FAR uint8_t *cache; /* On cached erase block for general I/O */
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FAR uint8_t *pack; /* A full erase block to support packing */
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};
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/* This structure describes the state of the blocks on the NXFFS volume */
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struct nxffs_blkstats_s
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{
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off_t nblocks; /* Total number of FLASH blocks */
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off_t ngood; /* Number of good FLASH blocks found */
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off_t nbad; /* Number of well-formatted FLASH blocks marked as bad */
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off_t nunformat; /* Number of unformatted FLASH blocks */
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off_t ncorrupt; /* Number of blocks with correupted format info */
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};
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/* The magic number that appears that the beginning of each NXFFS (logical)
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* block
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*/
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extern const uint8_t g_blockmagic[NXFFS_MAGICSIZE];
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/* The magic number that appears that the beginning of each NXFFS inode */
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extern const uint8_t g_inodemagic[NXFFS_MAGICSIZE];
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/* The magic number that appears that the beginning of each NXFFS inode
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* data block.
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*/
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extern const uint8_t g_datamagic[NXFFS_MAGICSIZE];
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/* If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
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* allocated NXFFS volume instance.
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*/
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#ifdef CONFIG_NXFSS_PREALLOCATED
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extern struct nxffs_volume_s g_volume;
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: nxffs_limits
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*
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* Description:
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* Recalculate file system limits: (1) the FLASH offset to the first,
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* valid inode, and (2) the FLASH offset to the first, unused byte after
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* the last inode (invalid or not).
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*
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* The first, lower limit must be recalculated: (1) initially, (2)
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* whenever the first inode is deleted, or (3) whenever inode is moved
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* as part of the file system packing operation.
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*
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* The second, upper limit must be (1) incremented whenever new file
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* data is written, or (2) recalculated as part of the file system packing
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* operation.
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*
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* Input Parameters:
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* volume - Identifies the NXFFS volume
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*
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* Returned Value:
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* Zero on success. Otherwise, a negated error is returned indicating the
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* nature of the failure.
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*
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* Defined in nxffs_initialize.c
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*
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****************************************************************************/
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extern int nxffs_limits(FAR struct nxffs_volume_s *volume);
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/****************************************************************************
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* Name: nxffs_rdle16
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*
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* Description:
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* Get a (possibly unaligned) 16-bit little endian value.
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*
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* Input Parameters:
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* val - A pointer to the first byte of the little endian value.
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*
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* Returned Values:
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* A uint16_t representing the whole 16-bit integer value
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern uint16_t nxffs_rdle16(FAR const uint8_t *val);
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/****************************************************************************
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* Name: nxffs_wrle16
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*
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* Description:
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* Put a (possibly unaligned) 16-bit little endian value.
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*
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* Input Parameters:
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* dest - A pointer to the first byte to save the little endian value.
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* val - The 16-bit value to be saved.
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*
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* Returned Values:
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* None
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern void nxffs_wrle16(uint8_t *dest, uint16_t val);
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/****************************************************************************
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* Name: nxffs_rdle32
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*
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* Description:
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* Get a (possibly unaligned) 32-bit little endian value.
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*
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* Input Parameters:
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* val - A pointer to the first byte of the little endian value.
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*
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* Returned Values:
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* A uint32_t representing the whole 32-bit integer value
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern uint32_t nxffs_rdle32(FAR const uint8_t *val);
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/****************************************************************************
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* Name: nxffs_wrle32
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*
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* Description:
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* Put a (possibly unaligned) 32-bit little endian value.
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*
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* Input Parameters:
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* dest - A pointer to the first byte to save the little endian value.
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* val - The 32-bit value to be saved.
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*
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* Returned Value:
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* None
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern void nxffs_wrle32(uint8_t *dest, uint32_t val);
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/****************************************************************************
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* Name: nxffs_erased
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*
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* Description:
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* Check if a block of memory is in the erased state.
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*
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* Input Parameters:
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* buffer - Address of the start of the memory to check.
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* buflen - The number of bytes to check.
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*
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* Returned Values:
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* The number of erased bytes found at the beginning of the memory region.
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*
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* Defined in nxffs_util.c
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*
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****************************************************************************/
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extern size_t nxffs_erased(FAR const uint8_t *buffer, size_t buflen);
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/****************************************************************************
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* Name: nxffs_rdcache
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*
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* Description:
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* Read one I/O block into the volume cache memory.
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*
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* Input Parameters:
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* volume - Describes the current volume
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* block - The first logical block to read
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*
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* Returned Value:
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* Negated errnos are returned only in the case of MTD reported failures.
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* Nothing in the volume data itself will generate errors.
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*
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* Defined in nxffs_cache.c
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*
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****************************************************************************/
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extern int nxffs_rdcache(FAR struct nxffs_volume_s *volume, off_t block);
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/****************************************************************************
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* Name: nxffs_wrcache
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*
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* Description:
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* Write one or more logical blocks from the volume cache memory.
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*
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* Input Parameters:
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* volume - Describes the current volume
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|
*
|
|
* Returned Value:
|
|
* Negated errnos are returned only in the case of MTD reported failures.
|
|
*
|
|
* Defined in nxffs_cache.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_wrcache(FAR struct nxffs_volume_s *volume);
|
|
|
|
/****************************************************************************
|
|
* 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.
|
|
*
|
|
* Defined in nxffs_cache.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern void nxffs_ioseek(FAR struct nxffs_volume_s *volume, off_t offset);
|
|
|
|
/****************************************************************************
|
|
* 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.
|
|
*
|
|
* Defined in nxffs_cache.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern off_t nxffs_iotell(FAR struct nxffs_volume_s *volume);
|
|
|
|
/****************************************************************************
|
|
* 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.
|
|
*
|
|
* Defined in nxffs_cache.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_getc(FAR struct nxffs_volume_s *volume, uint16_t reserve);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_freeentry
|
|
*
|
|
* Description:
|
|
* The inode values returned by nxffs_nextentry() include allocated memory
|
|
* (specifically, the file name string). This function should be called
|
|
* to dispose of that memory when the inode entry is no longer needed.
|
|
*
|
|
* Note that the nxffs_entry_s containing structure is not freed. The
|
|
* caller may call kfree upon return of this function if necessary to
|
|
* free the entry container.
|
|
*
|
|
* Input parameters:
|
|
* entry - The entry to be freed.
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Defined in nxffs_inode.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern void nxffs_freeentry(FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_nextentry
|
|
*
|
|
* Description:
|
|
* Search for the next valid inode starting at the provided FLASH offset.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume.
|
|
* offset - The FLASH memory offset to begin searching.
|
|
* entry - A pointer to memory provided by the caller in which to return
|
|
* the inode description.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno is returned
|
|
* that indicates the nature of the failure.
|
|
*
|
|
* Defined in nxffs_inode.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_nextentry(FAR struct nxffs_volume_s *volume, off_t offset,
|
|
FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_findinode
|
|
*
|
|
* Description:
|
|
* Search for an inode with the provided name starting with the first
|
|
* valid inode and proceeding to the end FLASH or until the matching
|
|
* inode is found.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* name - The name of the inode to find
|
|
* entry - The location to return information about the inode.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno is returned
|
|
* that indicates the nature of the failure.
|
|
*
|
|
* Defined in nxffs_inode.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_findinode(FAR struct nxffs_volume_s *volume,
|
|
FAR const char *name,
|
|
FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_inodeend
|
|
*
|
|
* Description:
|
|
* Return an *approximiate* FLASH offset to end of the inode data. The
|
|
* returned value is guaranteed to be be less then or equal to the offset
|
|
* of the thing-of-interest in FLASH. Parsing for interesting things
|
|
* can begin at that point.
|
|
*
|
|
* Assumption: The inode header has been verified by the caller and is
|
|
* known to contain valid data.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* entry - Describes the inode.
|
|
*
|
|
* Returned Value:
|
|
* A FLASH offset to the (approximate) end of the inode data. No errors
|
|
* are detected.
|
|
*
|
|
* Defined in nxffs_inode.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern off_t nxffs_inodeend(FAR struct nxffs_volume_s *volume,
|
|
FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_verifyblock
|
|
*
|
|
* Description:
|
|
* Assure the the provided (logical) block number is in the block cache
|
|
* and that it has a valid block header (i.e., proper magic and
|
|
* marked good)
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* block - The (logical) block number to load and verify.
|
|
*
|
|
* Returned Values:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned indicating the nature of the failure.
|
|
*
|
|
* Defined in nxffs_block.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_verifyblock(FAR struct nxffs_volume_s *volume, off_t block);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_validblock
|
|
*
|
|
* Description:
|
|
* Find the next valid (logical) block in the volume.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* block - On entry, this provides the starting block number. If the
|
|
* function is succesfful, then this memory location will hold the
|
|
* block number of the next valid block on return.
|
|
*
|
|
* Returned Value:
|
|
* Zero on success otherwise a negated errno value indicating the nature
|
|
* of the failure.
|
|
*
|
|
* Defined in nxffs_block.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_validblock(struct nxffs_volume_s *volume, off_t *block);
|
|
|
|
/****************************************************************************
|
|
* 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.
|
|
*
|
|
* Defined in nxffs_blockstats.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_blockstats(FAR struct nxffs_volume_s *volume,
|
|
FAR struct nxffs_blkstats_s *stats);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_reformat
|
|
*
|
|
* Description:
|
|
* Erase and reformat the entire volume. Verify each block and mark
|
|
* improperly erased blocks as bad.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume to be reformatted.
|
|
*
|
|
* Returned Value:
|
|
* Zero on success or a negated errno on a failure. Failures will be
|
|
* returned n the case of MTD reported failures o.
|
|
* Nothing in the volume data itself will generate errors.
|
|
*
|
|
* Defined in nxffs_reformat.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_reformat(FAR struct nxffs_volume_s *volume);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_findofile
|
|
*
|
|
* Description:
|
|
* Search the list of already opened files to see if the inode of this
|
|
* name is one of the opened files.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume.
|
|
* name - The name of the inode to check.
|
|
*
|
|
* Returned Value:
|
|
* If an inode of this name is found in the list of opened inodes, then
|
|
* a reference to the open file structure is returned. NULL is returned
|
|
* otherwise.
|
|
*
|
|
* Defined in nxffs_open.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern FAR struct nxffs_ofile_s *nxffs_findofile(FAR struct nxffs_volume_s *volume,
|
|
FAR const char *name);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_findwriter
|
|
*
|
|
* Description:
|
|
* Search the list of already opened files and return the open file
|
|
* instance for the write.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume.
|
|
*
|
|
* Returned Value:
|
|
* If there is an active writer of the volume, its open file instance is
|
|
* returned. NULL is returned otherwise.
|
|
*
|
|
* Defined in nxffs_open.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern FAR struct nxffs_wrfile_s *nxffs_findwriter(FAR struct nxffs_volume_s *volume);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_wrinode
|
|
*
|
|
* Description:
|
|
* Write the inode header (only to FLASH. This is done in two contexts:
|
|
*
|
|
* 1. When an inode is closed, or
|
|
* 2. As part of the file system packing logic when an inode is moved.
|
|
*
|
|
* Note that in either case, the inode name has already been written to
|
|
* FLASH.
|
|
*
|
|
* Input parameters
|
|
* volume - Describes the NXFFS volume
|
|
* entry - Describes the inode header to write
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success; Otherwise, a negated errno value is returned
|
|
* indicating the nature of the failure.
|
|
*
|
|
* Defined in nxffs_open.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_wrinode(FAR struct nxffs_volume_s *volume,
|
|
FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_updateinode
|
|
*
|
|
* Description:
|
|
* The packing logic has moved an inode. Check if any open files are using
|
|
* this inode and, if so, move the data in the open file structure as well.
|
|
*
|
|
* Input parameters
|
|
* volume - Describes the NXFFS volume
|
|
* entry - Describes the new inode entry
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success; Otherwise, a negated errno value is returned
|
|
* indicating the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_updateinode(FAR struct nxffs_volume_s *volume,
|
|
FAR struct nxffs_entry_s *entry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_wrreserve
|
|
*
|
|
* Description:
|
|
* Find a valid location for a file system object of 'size'. A valid
|
|
* location will have these properties:
|
|
*
|
|
* 1. It will lie in the free flash region.
|
|
* 2. It will have enough contiguous memory to hold the entire object
|
|
* 3. The memory at this location will be fully erased.
|
|
*
|
|
* This function will only perform the checks of 1) and 2). The
|
|
* end-of-filesystem offset, froffset, is update past this memory which,
|
|
* in effect, reserves the memory.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* size - The size of the object to be reserved.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned indicating the nature of the failure. Of special interest
|
|
* the return error of -ENOSPC which means that the FLASH volume is
|
|
* full and should be repacked.
|
|
*
|
|
* On successful return the following are also valid:
|
|
*
|
|
* volume->ioblock - Read/write block number of the block containing the
|
|
* candidate oject position
|
|
* volume->iooffset - The offset in the block to the candidate object
|
|
* position.
|
|
* volume->froffset - Updated offset to the first free FLASH block after
|
|
* the reserved memory.
|
|
*
|
|
* Defined in nxffs_write.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_wrreserve(FAR struct nxffs_volume_s *volume, size_t size);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_wrverify
|
|
*
|
|
* Description:
|
|
* Find a valid location for the object. A valid location will have
|
|
* these properties:
|
|
*
|
|
* 1. It will lie in the free flash region.
|
|
* 2. It will have enough contiguous memory to hold the entire header
|
|
* (excluding the file name which may lie in the next block).
|
|
* 3. The memory at this location will be fully erased.
|
|
*
|
|
* This function will only perform the check 3). On entry it assumes the
|
|
* following settings (left by nxffs_wrreserve()):
|
|
*
|
|
* volume->ioblock - Read/write block number of the block containing the
|
|
* candidate oject position
|
|
* volume->iooffset - The offset in the block to the candidate object
|
|
* position.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume
|
|
* size - The size of the object to be verifed.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned indicating the nature of the failure. Of special interest
|
|
* the return error of -ENOSPC which means that the FLASH volume is
|
|
* full and should be repacked.
|
|
*
|
|
* On successful return the following are also valid:
|
|
*
|
|
* volume->ioblock - Read/write block number of the block containing the
|
|
* verified object position
|
|
* volume->iooffset - The offset in the block to the verified object
|
|
* position.
|
|
* volume->froffset - Updated offset to the first free FLASH block.
|
|
*
|
|
* Defined in nxffs_write.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_wrverify(FAR struct nxffs_volume_s *volume, size_t size);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_wrblkhdr
|
|
*
|
|
* Description:
|
|
* Write the block header information. This is done (1) whenever the end-
|
|
* block is encountered and (2) also when the file is closed in order to
|
|
* flush the final block of data to FLASH.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the state of the NXFFS volume
|
|
* wrfile - Describes the state of the open file
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success; Otherwise, a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
* Defined in nxffs_write.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_wrblkhdr(FAR struct nxffs_volume_s *volume,
|
|
FAR struct nxffs_wrfile_s *wrfile);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_nextblock
|
|
*
|
|
* Description:
|
|
* Search for the next valid data block starting at the provided
|
|
* FLASH offset.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume.
|
|
* datlen - A memory location to return the data block length.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno is returned
|
|
* that indicates the nature of the failure.
|
|
*
|
|
* Defined in nxffs_read.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_nextblock(FAR struct nxffs_volume_s *volume, off_t offset,
|
|
FAR struct nxffs_blkentry_s *blkentry);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_rdblkhdr
|
|
*
|
|
* Description:
|
|
* Read and verify the data block header at the specified offset.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the current volume.
|
|
* offset - The byte offset from the beginning of FLASH where the data block
|
|
* header is expected.
|
|
* datlen - A memory location to return the data block length.
|
|
*
|
|
* Returned Value:
|
|
* Zero on success. Otherwise, a negated errno value is returned
|
|
* indicating the nature of the failure.
|
|
*
|
|
* Defined in nxffs_read.c
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_rdblkhdr(FAR struct nxffs_volume_s *volume, off_t offset,
|
|
FAR uint16_t *datlen);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_rminode
|
|
*
|
|
* Description:
|
|
* Remove an inode from FLASH. This is the internal implementation of
|
|
* the file system unlinke operation.
|
|
*
|
|
* Input Parameters:
|
|
* volume - Describes the NXFFS volume.
|
|
* name - the name of the inode to be deleted.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned if the inode is successfully deleted. Otherwise, a
|
|
* negated errno value is returned indicating the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_rminode(FAR struct nxffs_volume_s *volume, FAR const char *name);
|
|
|
|
/****************************************************************************
|
|
* Name: nxffs_pack
|
|
*
|
|
* Description:
|
|
* Pack and re-write the filesystem in order to free up memory at the end
|
|
* of FLASH.
|
|
*
|
|
* Input Parameters:
|
|
* volume - The volume to be packed.
|
|
*
|
|
* Returned Values:
|
|
* Zero on success; Otherwise, a negated errno value is returned to
|
|
* indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
extern int nxffs_pack(FAR struct nxffs_volume_s *volume);
|
|
|
|
/****************************************************************************
|
|
* Standard mountpoint operation methods
|
|
*
|
|
* Description:
|
|
* See include/nuttx/fs/fs.h
|
|
*
|
|
* - nxffs_open() and nxffs_close() are defined in nxffs_open.c
|
|
* - nxffs_read() is defined in nxffs_read.c
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* - nxffs_write() is defined in nxffs_write.c
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* - nxffs_ioctl() is defined in nxffs_ioctl.c
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* - nxffs_opendir(), nxffs_readdir(), and nxffs_rewindir() are defined in
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* nxffs_dirent.c
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* - nxffs_bind() and nxffs_unbind() are defined in nxffs_initialize.c
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* - nxffs_stat() and nxffs_statfs() are defined in nxffs_stat.c
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* - nxffs_unlink() is defined nxffs_unlink.c
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*
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****************************************************************************/
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struct file; /* Forward references */
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struct inode;
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struct fs_dirent_s;
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struct statfs;
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struct stat;
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extern int nxffs_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode);
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extern int nxffs_close(FAR struct file *filep);
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extern ssize_t nxffs_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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extern ssize_t nxffs_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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extern int nxffs_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
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extern int nxffs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
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FAR struct fs_dirent_s *dir);
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extern int nxffs_readdir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir);
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extern int nxffs_rewinddir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir);
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extern int nxffs_bind(FAR struct inode *blkdriver, FAR const void *data,
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FAR void **handle);
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extern int nxffs_unbind(FAR void *handle, FAR struct inode **blkdriver);
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extern int nxffs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf);
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extern int nxffs_stat(FAR struct inode *mountpt, FAR const char *relpath,
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FAR struct stat *buf);
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extern int nxffs_unlink(FAR struct inode *mountpt, FAR const char *relpath);
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#endif /* __FS_NXFFS_NXFFS_H */
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