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| /* ----> DO NOT REMOVE THE FOLLOWING NOTICE <---- | ||
| Copyright (c) 2014-2020 Datalight, Inc. | ||
| All Rights Reserved Worldwide. | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; use version 2 of the License. | ||
| This program is distributed in the hope that it will be useful, | ||
| but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty | ||
| of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License along | ||
| with this program; if not, write to the Free Software Foundation, Inc., | ||
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| */ | ||
| /* Businesses and individuals that for commercial or other reasons cannot | ||
| comply with the terms of the GPLv2 license must obtain a commercial license | ||
| before incorporating Reliance Edge into proprietary software for | ||
| distribution in any form. Visit http://www.datalight.com/reliance-edge for | ||
| more information. | ||
| */ | ||
| /** @file | ||
| @brief Implements the block device abstraction of the file system. | ||
| */ | ||
| #include <redfs.h> | ||
| #include <redvolume.h> | ||
| #include <redbdev.h> | ||
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| BDEVINFO gaRedBdevInfo[REDCONF_VOLUME_COUNT]; | ||
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| /** @brief Initialize a block device. | ||
| This function is called when the file system needs access to a block | ||
| device. | ||
| Upon successful return, the block device should be fully initialized and | ||
| ready to service read/write/flush/close requests. | ||
| The behavior of calling this function on a block device which is already | ||
| open is undefined. | ||
| @param bVolNum The volume number of the volume whose block device is being | ||
| initialized. | ||
| @param mode The open mode, indicating the type of access required. | ||
| @return A negated ::REDSTATUS code indicating the operation result. | ||
| @retval 0 Operation was successful. | ||
| @retval -RED_EINVAL @p bVolNum is an invalid volume number. | ||
| @retval -RED_EIO A disk I/O error occurred. | ||
| */ | ||
| REDSTATUS RedBDevOpen( | ||
| uint8_t bVolNum, | ||
| BDEVOPENMODE mode) | ||
| { | ||
| REDSTATUS ret; | ||
|
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| if(bVolNum >= REDCONF_VOLUME_COUNT) | ||
| { | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| ret = RedOsBDevOpen(bVolNum, mode); | ||
| } | ||
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| if(ret == 0) | ||
| { | ||
| BDEVINFO *pBdevInfo = &gaRedBdevInfo[bVolNum]; | ||
| const VOLCONF *pVolConf = &gaRedVolConf[bVolNum]; | ||
| BDEVINFO info; | ||
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| if( (pVolConf->ullSectorCount == SECTOR_COUNT_AUTO) | ||
| || (pVolConf->ulSectorSize == SECTOR_SIZE_AUTO)) | ||
| { | ||
| ret = RedOsBDevGetGeometry(bVolNum, &info); | ||
| if(ret == 0) | ||
| { | ||
| if( (pVolConf->ullSectorCount != SECTOR_COUNT_AUTO) | ||
| && (pVolConf->ullSectorCount != info.ullSectorCount)) | ||
| { | ||
| REDERROR(); | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else if( (pVolConf->ulSectorSize != SECTOR_COUNT_AUTO) | ||
| && (pVolConf->ulSectorSize != info.ulSectorSize)) | ||
| { | ||
| REDERROR(); | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else if(pVolConf->ullSectorOffset >= info.ullSectorCount) | ||
| { | ||
| REDERROR(); | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| *pBdevInfo = info; | ||
|
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| /* Volumes which begin at a sector offset and are of | ||
| automatically-detected size, extend from the sector | ||
| offset to the end of the media. The block device | ||
| will return the total size of the media, so the | ||
| adjustment happens here. | ||
| */ | ||
| pBdevInfo->ullSectorCount -= pVolConf->ullSectorOffset; | ||
| } | ||
| } | ||
| } | ||
| else | ||
| { | ||
| pBdevInfo->ullSectorCount = pVolConf->ullSectorCount; | ||
| pBdevInfo->ulSectorSize = pVolConf->ulSectorSize; | ||
|
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| /* Query the geometry (if supported) to validate that the | ||
| statically configured geometry is compatible with the | ||
| block device. | ||
| */ | ||
| ret = RedOsBDevGetGeometry(bVolNum, &info); | ||
| if(ret == 0) | ||
| { | ||
| if(!VOLUME_SECTOR_GEOMETRY_IS_VALID(bVolNum, info.ulSectorSize, info.ullSectorCount)) | ||
| { | ||
| /* The statically configured geometry is incompatible with | ||
| the reported geometry. | ||
| */ | ||
| ret = -RED_EINVAL; | ||
| } | ||
| } | ||
| else if(ret == -RED_ENOTSUPP) | ||
| { | ||
| /* Querying the geometry is not supported, so we can't | ||
| validate it. | ||
| */ | ||
| ret = 0; | ||
| } | ||
| else | ||
| { | ||
| /* Unexpected error. | ||
| */ | ||
| } | ||
| } | ||
|
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||
| if(ret != 0) | ||
| { | ||
| (void)RedOsBDevClose(bVolNum); | ||
| } | ||
| } | ||
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| return ret; | ||
| } | ||
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| /** @brief Uninitialize a block device. | ||
| This function is called when the file system no longer needs access to a | ||
| block device. If any resource were allocated by RedBDevOpen() to service | ||
| block device requests, they should be freed at this time. | ||
| Upon successful return, the block device must be in such a state that it | ||
| can be opened again. | ||
| The behavior of calling this function on a block device which is already | ||
| closed is undefined. | ||
| @param bVolNum The volume number of the volume whose block device is being | ||
| uninitialized. | ||
| @return A negated ::REDSTATUS code indicating the operation result. | ||
| @retval 0 Operation was successful. | ||
| @retval -RED_EINVAL @p bVolNum is an invalid volume number. | ||
| */ | ||
| REDSTATUS RedBDevClose( | ||
| uint8_t bVolNum) | ||
| { | ||
| REDSTATUS ret; | ||
|
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| if(bVolNum >= REDCONF_VOLUME_COUNT) | ||
| { | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| ret = RedOsBDevClose(bVolNum); | ||
| } | ||
|
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| return ret; | ||
| } | ||
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| /** @brief Read sectors from a physical block device. | ||
| The behavior of calling this function is undefined if the block device is | ||
| closed or if it was opened with ::BDEV_O_WRONLY. | ||
| @param bVolNum The volume number of the volume whose block device | ||
| is being read from. | ||
| @param ullSectorStart The starting sector number. | ||
| @param ulSectorCount The number of sectors to read. | ||
| @param pBuffer The buffer into which to read the sector data. | ||
| @return A negated ::REDSTATUS code indicating the operation result. | ||
| @retval 0 Operation was successful. | ||
| @retval -RED_EINVAL @p bVolNum is an invalid volume number, @p pBuffer is | ||
| `NULL`, or @p ullStartSector and/or @p ulSectorCount | ||
| refer to an invalid range of sectors. | ||
| @retval -RED_EIO A disk I/O error occurred. | ||
| */ | ||
| REDSTATUS RedBDevRead( | ||
| uint8_t bVolNum, | ||
| uint64_t ullSectorStart, | ||
| uint32_t ulSectorCount, | ||
| void *pBuffer) | ||
| { | ||
| REDSTATUS ret; | ||
|
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| if( (bVolNum >= REDCONF_VOLUME_COUNT) | ||
| || !VOLUME_SECTOR_RANGE_IS_VALID(bVolNum, ullSectorStart, ulSectorCount) | ||
| || (pBuffer == NULL)) | ||
| { | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| ret = RedOsBDevRead(bVolNum, ullSectorStart, ulSectorCount, pBuffer); | ||
| } | ||
|
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| return ret; | ||
| } | ||
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| #if REDCONF_READ_ONLY == 0 | ||
| /** @brief Write sectors to a physical block device. | ||
| The behavior of calling this function is undefined if the block device is | ||
| closed or if it was opened with ::BDEV_O_RDONLY. | ||
| @param bVolNum The volume number of the volume whose block device | ||
| is being written to. | ||
| @param ullSectorStart The starting sector number. | ||
| @param ulSectorCount The number of sectors to write. | ||
| @param pBuffer The buffer from which to write the sector data. | ||
| @return A negated ::REDSTATUS code indicating the operation result. | ||
| @retval 0 Operation was successful. | ||
| @retval -RED_EINVAL @p bVolNum is an invalid volume number, @p pBuffer is | ||
| `NULL`, or @p ullStartSector and/or @p ulSectorCount | ||
| refer to an invalid range of sectors. | ||
| @retval -RED_EIO A disk I/O error occurred. | ||
| */ | ||
| REDSTATUS RedBDevWrite( | ||
| uint8_t bVolNum, | ||
| uint64_t ullSectorStart, | ||
| uint32_t ulSectorCount, | ||
| const void *pBuffer) | ||
| { | ||
| REDSTATUS ret; | ||
|
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| if( (bVolNum >= REDCONF_VOLUME_COUNT) | ||
| || !VOLUME_SECTOR_RANGE_IS_VALID(bVolNum, ullSectorStart, ulSectorCount) | ||
| || (pBuffer == NULL)) | ||
| { | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| ret = RedOsBDevWrite(bVolNum, ullSectorStart, ulSectorCount, pBuffer); | ||
| } | ||
|
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| return ret; | ||
| } | ||
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| /** @brief Flush any caches beneath the file system. | ||
| This function must synchronously flush all software and hardware caches | ||
| beneath the file system, ensuring that all sectors written previously are | ||
| committed to permanent storage. | ||
| If the environment has no caching beneath the file system, the | ||
| implementation of this function can do nothing and return success. | ||
| The behavior of calling this function is undefined if the block device is | ||
| closed or if it was opened with ::BDEV_O_RDONLY. | ||
| @param bVolNum The volume number of the volume whose block device is being | ||
| flushed. | ||
| @return A negated ::REDSTATUS code indicating the operation result. | ||
| @retval 0 Operation was successful. | ||
| @retval -RED_EINVAL @p bVolNum is an invalid volume number. | ||
| @retval -RED_EIO A disk I/O error occurred. | ||
| */ | ||
| REDSTATUS RedBDevFlush( | ||
| uint8_t bVolNum) | ||
| { | ||
| REDSTATUS ret; | ||
|
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| if(bVolNum >= REDCONF_VOLUME_COUNT) | ||
| { | ||
| ret = -RED_EINVAL; | ||
| } | ||
| else | ||
| { | ||
| ret = RedOsBDevFlush(bVolNum); | ||
| } | ||
|
|
||
| return ret; | ||
| } | ||
| #endif /* REDCONF_READ_ONLY == 0 */ | ||
|
|
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