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[JFFS2] Core changes required to support JFFS2-on-Dataflash devices.

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DataFlash page-sizes are not a power of two (they're multiples of 528
bytes).  There are a few places in JFFS2 code where sector_size is used
as a bitmask.  A new macro (SECTOR_ADDR) was defined to calculate these
sector addresses. For non-DataFlash devices, the original (faster)
bitmask operation is still used.

In scan.c, the EMPTY_SCAN_SIZE was a constant of 1024.
Since this could be larger than the sector size of the DataFlash, this
is now basically set to MIN(sector_size, 1024).

Addition of a jffs2_is_writebuffered() macro.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andrew Victor
2005-02-09 09:09:05 +00:00
committed by Thomas Gleixner
parent 045e9a5d51
commit 3be36675d4
5 changed files with 53 additions and 44 deletions
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5
fs/jffs2/os-linux.h
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@@ -7,7 +7,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: os-linux.h,v 1.51 2004/11/16 20:36:11 dwmw2 Exp $
* $Id: os-linux.h,v 1.52 2005/02/09 09:09:01 pavlov Exp $
*
*/
@@ -97,7 +97,10 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
#endif
}
#define SECTOR_ADDR(x) ( ((unsigned long)(x) & ~(c->sector_size-1)) )
#define jffs2_is_readonly(c) (OFNI_BS_2SFFJ(c)->s_flags & MS_RDONLY)
#define jffs2_is_writebuffered(c) (c->wbuf != NULL)
#if (!defined CONFIG_JFFS2_FS_NAND && !defined CONFIG_JFFS2_FS_NOR_ECC)
#define jffs2_can_mark_obsolete(c) (1)