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authorAndrew Victor <andrew@sanpeople.com>2005-02-09 09:09:05 +0000
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-05-23 12:27:09 +0200
commit3be36675d41a30ed3b192f92684f1417aa0f8bfe (patch)
treeda8395bb14ffef19e551c509c47d16b52fb536d9 /fs/jffs2/os-linux.h
parent045e9a5d51ced27bfcbdb78071534ce6fd36b33d (diff)
downloadop-kernel-dev-3be36675d41a30ed3b192f92684f1417aa0f8bfe.zip
op-kernel-dev-3be36675d41a30ed3b192f92684f1417aa0f8bfe.tar.gz
[JFFS2] Core changes required to support JFFS2-on-Dataflash devices.
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>
Diffstat (limited to 'fs/jffs2/os-linux.h')
-rw-r--r--fs/jffs2/os-linux.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index 03b0acc..0412416 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -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)
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