Commit 8f15fd55 authored by Andrew Victor's avatar Andrew Victor Committed by Thomas Gleixner
Browse files

[JFFS2] Add support for JFFS2-on-Dataflash devices. 



For Dataflash, can_mark_obsolete = false and the NAND write buffering
code (wbuf.c) is used.

Since the DataFlash chip will automatically erase pages when writing,
the cleanmarkers are not needed - so cleanmarker_oob = false and
cleanmarker_size = 0

DataFlash page-sizes are not a power of two (they're multiples of 528
bytes).  The SECTOR_ADDR macro (added in the previous core patch) is
replaced with a (slower) div/mod version if CONFIG_JFFS2_FS_DATAFLASH is
selected.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3be36675

fs/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -1084,6 +1084,13 @@ config JFFS2_FS_NOR_ECC 
          ECC for JFFS2. This type of flash chip is not common, however it is

          available from ST Microelectronics.



config JFFS2_FS_DATAFLASH

	bool "JFFS2 support for DataFlash (EXPERIMENTAL)"

	depends on JFFS2_FS && EXPERIMENTAL

	default n

	help

	  This enables the experimental support for JFFS2 on DataFlash devices.



config JFFS2_COMPRESSION_OPTIONS

	bool "Advanced compression options for JFFS2"

	depends on JFFS2_FS

fs/jffs2/Makefile

+2 −1
Original line number Diff line number Diff line 
#

# Makefile for the Linux Journalling Flash File System v2 (JFFS2)

#

# $Id: Makefile.common,v 1.7 2004/11/03 12:57:38 jwboyer Exp $

# $Id: Makefile.common,v 1.8 2005/02/09 09:17:40 pavlov Exp $

#



obj-$(CONFIG_JFFS2_FS) += jffs2.o
@@ -13,6 +13,7 @@ jffs2-y += super.o 


jffs2-$(CONFIG_JFFS2_FS_NAND)	+= wbuf.o

jffs2-$(CONFIG_JFFS2_FS_NOR_ECC) += wbuf.o

jffs2-$(CONFIG_JFFS2_FS_DATAFLASH) += wbuf.o

jffs2-$(CONFIG_JFFS2_RUBIN)	+= compr_rubin.o

jffs2-$(CONFIG_JFFS2_RTIME)	+= compr_rtime.o

jffs2-$(CONFIG_JFFS2_ZLIB)	+= compr_zlib.o

fs/jffs2/erase.c

+10 −3
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 * $Id: erase.c,v 1.70 2005/02/09 09:09:01 pavlov Exp $

 * $Id: erase.c,v 1.71 2005/02/09 09:17:40 pavlov Exp $

 *

 */
@@ -310,7 +310,7 @@ static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseb 
	int ret;

	uint32_t bad_offset;



	if (!jffs2_cleanmarker_oob(c)) {

	if ((!jffs2_cleanmarker_oob(c)) && (c->cleanmarker_size > 0)) {

		marker_ref = jffs2_alloc_raw_node_ref();

		if (!marker_ref) {

			printk(KERN_WARNING "Failed to allocate raw node ref for clean marker\n");
@@ -351,7 +351,7 @@ static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseb 
					bad_offset += i;

					printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", datum, bad_offset);

				bad: 

					if (!jffs2_cleanmarker_oob(c))

					if ((!jffs2_cleanmarker_oob(c)) && (c->cleanmarker_size > 0))

						jffs2_free_raw_node_ref(marker_ref);

					kfree(ebuf);

				bad2:
@@ -383,6 +383,13 @@ static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseb 
			

		jeb->first_node = jeb->last_node = NULL;



		jeb->free_size = c->sector_size;

		jeb->used_size = 0;

		jeb->dirty_size = 0;

		jeb->wasted_size = 0;

	} else if (c->cleanmarker_size == 0) {

		jeb->first_node = jeb->last_node = NULL;



		jeb->free_size = c->sector_size;

		jeb->used_size = 0;

		jeb->dirty_size = 0;

fs/jffs2/fs.c

+20 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 * $Id: fs.c,v 1.51 2004/11/28 12:19:37 dedekind Exp $

 * $Id: fs.c,v 1.52 2005/02/09 09:17:40 pavlov Exp $

 *

 */
@@ -456,6 +456,12 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) 
		return -EINVAL;

	}

#endif

#ifndef CONFIG_JFFS2_FS_DATAFLASH

	if (c->mtd->type == MTD_DATAFLASH) {

		printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");

		return -EINVAL;

	}

#endif



	c->flash_size = c->mtd->size;
@@ -661,6 +667,14 @@ static int jffs2_flash_setup(struct jffs2_sb_info *c) { 
		if (ret)

			return ret;

	}

	

	/* and Dataflash */

	if (jffs2_dataflash(c)) {

		ret = jffs2_dataflash_setup(c);

		if (ret)

			return ret;

	}

	

	return ret;

}
@@ -674,4 +688,9 @@ void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 
	if (jffs2_nor_ecc(c)) {

		jffs2_nor_ecc_flash_cleanup(c);

	}

	

	/* and DataFlash */

	if (jffs2_dataflash(c)) {

		jffs2_dataflash_cleanup(c);

	}

}

fs/jffs2/os-linux.h

+16 −2
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
 *

 * For licensing information, see the file 'LICENCE' in this directory.

 *

 * $Id: os-linux.h,v 1.52 2005/02/09 09:09:01 pavlov Exp $

 * $Id: os-linux.h,v 1.53 2005/02/09 09:17:41 pavlov Exp $

 *

 */
@@ -97,12 +97,16 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f) 
#endif

}



#ifdef CONFIG_JFFS2_FS_DATAFLASH

#define SECTOR_ADDR(x) ( ((unsigned long)(x) / (unsigned long)(c->sector_size)) * c->sector_size )

#else

#define SECTOR_ADDR(x) ( ((unsigned long)(x) & ~(c->sector_size-1)) )

#endif



#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)

#if (!defined CONFIG_JFFS2_FS_NAND && !defined CONFIG_JFFS2_FS_NOR_ECC && !defined CONFIG_JFFS2_FS_DATAFLASH)

#define jffs2_can_mark_obsolete(c) (1)

#define jffs2_cleanmarker_oob(c) (0)

#define jffs2_write_nand_cleanmarker(c,jeb) (-EIO)
@@ -119,6 +123,7 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f) 
#define jffs2_wbuf_timeout NULL

#define jffs2_wbuf_process NULL

#define jffs2_nor_ecc(c) (0)

#define jffs2_dataflash(c) (0)

#define jffs2_nor_ecc_flash_setup(c) (0)

#define jffs2_nor_ecc_flash_cleanup(c) do {} while (0)
@@ -154,6 +159,15 @@ void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c); 
#define jffs2_nor_ecc_flash_setup(c) (0)

#define jffs2_nor_ecc_flash_cleanup(c) do {} while (0)

#endif /* NOR ECC */

#ifdef CONFIG_JFFS2_FS_DATAFLASH

#define jffs2_dataflash(c) (c->mtd->type == MTD_DATAFLASH)

int jffs2_dataflash_setup(struct jffs2_sb_info *c);

void jffs2_dataflash_cleanup(struct jffs2_sb_info *c);

#else

#define jffs2_dataflash(c) (0)

#define jffs2_dataflash_setup(c) (0)

#define jffs2_dataflash_cleanup(c) do {} while (0)

#endif /* DATAFLASH */

#endif /* NAND */



/* erase.c */

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