REDSTATUS RedVolFormat()

in FreeRTOS-Plus/Source/Reliance-Edge/core/driver/format.c [43:231]

• 132 lines of code
• 22 McCabe index (conditional complexity)

REDSTATUS RedVolFormat(void)
{
    REDSTATUS   ret;

    if(gpRedVolume->fMounted)
    {
        ret = -RED_EBUSY;
    }
    else
    {
        ret = RedOsBDevOpen(gbRedVolNum, BDEV_O_RDWR);
    }

    if(ret == 0)
    {
        MASTERBLOCK    *pMB;
        REDSTATUS       ret2;

        /*  Overwrite the master block with zeroes, so that if formatting is
            interrupted, the volume will not be mountable.
        */
        ret = RedBufferGet(BLOCK_NUM_MASTER, BFLAG_NEW | BFLAG_DIRTY, CAST_VOID_PTR_PTR(&pMB));

        if(ret == 0)
        {
            ret = RedBufferFlush(BLOCK_NUM_MASTER, 1U);

            RedBufferDiscard(pMB);
        }

        if(ret == 0)
        {
            ret = RedIoFlush(gbRedVolNum);
        }

      #if REDCONF_IMAP_EXTERNAL == 1
        if((ret == 0) && !gpRedCoreVol->fImapInline)
        {
            uint32_t ulImapBlock;
            uint32_t ulImapBlockLimit = gpRedCoreVol->ulImapStartBN + (gpRedCoreVol->ulImapNodeCount * 2U);
            uint16_t uImapFlags = (uint16_t)((uint32_t)BFLAG_META_IMAP | BFLAG_NEW | BFLAG_DIRTY);

            /*  Technically it is only necessary to create one copy of each imap
                node (the copy the metaroot points at), but creating them both
                avoids headaches during disk image analysis from stale imaps
                left over from previous formats.
            */
            for(ulImapBlock = gpRedCoreVol->ulImapStartBN; ulImapBlock < ulImapBlockLimit; ulImapBlock++)
            {
                IMAPNODE   *pImap;

                ret = RedBufferGet(ulImapBlock, uImapFlags, CAST_VOID_PTR_PTR(&pImap));
                if(ret != 0)
                {
                    break;
                }

                RedBufferPut(pImap);
            }
        }
      #endif

        /*  Write the first metaroot.
        */
        if(ret == 0)
        {
            RedMemSet(gpRedMR, 0U, sizeof(*gpRedMR));

            gpRedMR->ulFreeBlocks = gpRedVolume->ulBlocksAllocable;
          #if REDCONF_API_POSIX == 1
            gpRedMR->ulFreeInodes = gpRedVolConf->ulInodeCount;
          #endif
            gpRedMR->ulAllocNextBlock = gpRedCoreVol->ulFirstAllocableBN;

            /*  The branched flag is typically set automatically when bits in
                the imap change.  It is set here explicitly because the imap has
                only been initialized, not changed.
            */
            gpRedCoreVol->fBranched = true;

            ret = RedVolTransact();
        }

      #if REDCONF_API_POSIX == 1
        /*  Create the root directory.
        */
        if(ret == 0)
        {
            CINODE rootdir;

            rootdir.ulInode = INODE_ROOTDIR;
            ret = RedInodeCreate(&rootdir, INODE_INVALID, RED_S_IFDIR);

            if(ret == 0)
            {
                RedInodePut(&rootdir, 0U);
            }
        }
      #endif

      #if REDCONF_API_FSE == 1
        /*  The FSE API does not support creating or deletes files, so all the
            inodes are created during setup.
        */
        if(ret == 0)
        {
            uint32_t ulInodeIdx;

            for(ulInodeIdx = 0U; ulInodeIdx < gpRedVolConf->ulInodeCount; ulInodeIdx++)
            {
                CINODE ino;

                ino.ulInode = INODE_FIRST_FREE + ulInodeIdx;
                ret = RedInodeCreate(&ino, INODE_INVALID, RED_S_IFREG);

                if(ret == 0)
                {
                    RedInodePut(&ino, 0U);
                }
            }
        }
      #endif

        /*  Write the second metaroot.
        */
        if(ret == 0)
        {
            ret = RedVolTransact();
        }

        /*  Populate and write out the master block.
        */
        if(ret == 0)
        {
            ret = RedBufferGet(BLOCK_NUM_MASTER, (uint16_t)((uint32_t)BFLAG_META_MASTER | BFLAG_NEW | BFLAG_DIRTY), CAST_VOID_PTR_PTR(&pMB));
        }

        if(ret == 0)
        {
            pMB->ulVersion = RED_DISK_LAYOUT_VERSION;
            RedStrNCpy(pMB->acBuildNum, RED_BUILD_NUMBER, sizeof(pMB->acBuildNum));
            pMB->ulFormatTime = RedOsClockGetTime();
            pMB->ulInodeCount = gpRedVolConf->ulInodeCount;
            pMB->ulBlockCount = gpRedVolume->ulBlockCount;
            pMB->uMaxNameLen = REDCONF_NAME_MAX;
            pMB->uDirectPointers = REDCONF_DIRECT_POINTERS;
            pMB->uIndirectPointers = REDCONF_INDIRECT_POINTERS;
            pMB->bBlockSizeP2 = BLOCK_SIZE_P2;

          #if REDCONF_API_POSIX == 1
            pMB->bFlags |= MBFLAG_API_POSIX;
          #endif
          #if REDCONF_INODE_TIMESTAMPS == 1
            pMB->bFlags |= MBFLAG_INODE_TIMESTAMPS;
          #endif
          #if REDCONF_INODE_BLOCKS == 1
            pMB->bFlags |= MBFLAG_INODE_BLOCKS;
          #endif
          #if (REDCONF_API_POSIX == 1) && (REDCONF_API_POSIX_LINK == 1)
            pMB->bFlags |= MBFLAG_INODE_NLINK;
          #endif

            ret = RedBufferFlush(BLOCK_NUM_MASTER, 1U);

            RedBufferPut(pMB);
        }

        if(ret == 0)
        {
            ret = RedIoFlush(gbRedVolNum);
        }

        ret2 = RedOsBDevClose(gbRedVolNum);
        if(ret == 0)
        {
            ret = ret2;
        }
    }

    /*  Discard the buffers so a subsequent format will not run into blocks it
        does not expect.
    */
    if(ret == 0)
    {
        ret = RedBufferDiscardRange(0U, gpRedVolume->ulBlockCount);
    }

    return ret;
}