mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-19 21:11:57 -04:00
134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
|
|
|
|
Copyright (c) 2014-2015 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 may 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 routines for the inline imap.
|
|
|
|
The inline imap is used on volumes that are small enough for the imap bitmap
|
|
to be entirely contained within the metaroot.
|
|
*/
|
|
#include <redfs.h>
|
|
|
|
#if REDCONF_IMAP_INLINE == 1
|
|
|
|
#include <redcore.h>
|
|
|
|
|
|
/** @brief Get the allocation bit of a block from either metaroot.
|
|
|
|
@param bMR The metaroot index: either 0 or 1.
|
|
@param ulBlock The block number to query.
|
|
@param pfAllocated On successful return, populated with the allocation bit
|
|
of the block.
|
|
|
|
@return A negated ::REDSTATUS code indicating the operation result.
|
|
|
|
@retval 0 Operation was successful.
|
|
@retval -RED_EINVAL @p bMR is out of range; or @p ulBlock is out of range;
|
|
@p pfAllocated is `NULL`; or the current volume does not
|
|
use the inline imap.
|
|
*/
|
|
REDSTATUS RedImapIBlockGet(
|
|
uint8_t bMR,
|
|
uint32_t ulBlock,
|
|
bool *pfAllocated)
|
|
{
|
|
REDSTATUS ret;
|
|
|
|
if( (!gpRedCoreVol->fImapInline)
|
|
|| (bMR > 1U)
|
|
|| (ulBlock < gpRedCoreVol->ulInodeTableStartBN)
|
|
|| (ulBlock >= gpRedVolume->ulBlockCount)
|
|
|| (pfAllocated == NULL))
|
|
{
|
|
REDERROR();
|
|
ret = -RED_EINVAL;
|
|
}
|
|
else
|
|
{
|
|
*pfAllocated = RedBitGet(gpRedCoreVol->aMR[bMR].abEntries, ulBlock - gpRedCoreVol->ulInodeTableStartBN);
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
#if REDCONF_READ_ONLY == 0
|
|
/** @brief Set the allocation bit of a block in the working metaroot.
|
|
|
|
@param ulBlock The block number to allocate or free.
|
|
@param fAllocated Whether to allocate the block (true) or free it (false).
|
|
|
|
@return A negated ::REDSTATUS code indicating the operation result.
|
|
|
|
@retval 0 Operation was successful.
|
|
@retval -RED_EINVAL @p ulBlock is out of range; or the current volume does
|
|
not use the inline imap.
|
|
*/
|
|
REDSTATUS RedImapIBlockSet(
|
|
uint32_t ulBlock,
|
|
bool fAllocated)
|
|
{
|
|
REDSTATUS ret;
|
|
|
|
if( (!gpRedCoreVol->fImapInline)
|
|
|| (ulBlock < gpRedCoreVol->ulInodeTableStartBN)
|
|
|| (ulBlock >= gpRedVolume->ulBlockCount))
|
|
{
|
|
REDERROR();
|
|
ret = -RED_EINVAL;
|
|
}
|
|
else
|
|
{
|
|
uint32_t ulOffset = ulBlock - gpRedCoreVol->ulInodeTableStartBN;
|
|
|
|
if(RedBitGet(gpRedMR->abEntries, ulOffset) == fAllocated)
|
|
{
|
|
/* The driver shouldn't ever set a bit in the imap to its current
|
|
value. This is more of a problem with the external imap, but it
|
|
is checked here for consistency.
|
|
*/
|
|
CRITICAL_ERROR();
|
|
ret = -RED_EFUBAR;
|
|
}
|
|
else if(fAllocated)
|
|
{
|
|
RedBitSet(gpRedMR->abEntries, ulOffset);
|
|
ret = 0;
|
|
}
|
|
else
|
|
{
|
|
RedBitClear(gpRedMR->abEntries, ulOffset);
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#endif /* REDCONF_IMAP_INLINE == 1 */
|
|
|