[JFFS2] Use a single config option for write buffer support

This patch replaces the current CONFIG_JFFS2_FS_NAND, CONFIG_JFFS2_FS_NOR_ECC
and CONFIG_JFFS2_FS_DATAFLASH with a single configuration option -
CONFIG_JFFS2_FS_WRITEBUFFER.

The only functional change of this patch is that the slower div/mod
calculations for SECTOR_ADDR(), PAGE_DIV() and PAGE_MOD() are now always
used when CONFIG_JFFS2_FS_WRITEBUFFER is enabled.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

fs/Kconfig

@@ -1063,33 +1063,18 @@ config JFFS2_FS_DEBUG
 	  If reporting bugs, please try to have available a full dump of the
 	  messages at debug level 1 while the misbehaviour was occurring.
 
-config JFFS2_FS_NAND
-	bool "JFFS2 support for NAND flash"
+config JFFS2_FS_WRITEBUFFER
+	bool "JFFS2 write-buffering support"
 	depends on JFFS2_FS
-	default n
+	default y
 	help
-	  This enables the support for NAND flash in JFFS2. NAND is a newer
-	  type of flash chip design than the traditional NOR flash, with
-	  higher density but a handful of characteristics which make it more
-	  interesting for the file system to use.
+	  This enables the write-buffering support in JFFS2.
 
-	  Say 'N' unless you have NAND flash.
-
-config JFFS2_FS_NOR_ECC
-        bool "JFFS2 support for ECC'd NOR flash (EXPERIMENTAL)"
-        depends on JFFS2_FS && EXPERIMENTAL
-        default n
-        help
-          This enables the experimental support for NOR flash with transparent
-          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.
+	  This functionality is required to support JFFS2 on the following
+	  types of flash devices:
+	    - NAND flash
+	    - NOR flash with transparent ECC
+	    - DataFlash
 
 config JFFS2_COMPRESSION_OPTIONS
 	bool "Advanced compression options for JFFS2"

fs/jffs2/Makefile

@@ -1,7 +1,7 @@
 #
 # Makefile for the Linux Journalling Flash File System v2 (JFFS2)
 #
-# $Id: Makefile.common,v 1.8 2005/02/09 09:17:40 pavlov Exp $
+# $Id: Makefile.common,v 1.9 2005/02/09 09:23:53 pavlov Exp $
 #
 
 obj-$(CONFIG_JFFS2_FS) += jffs2.o
@@ -11,9 +11,7 @@ jffs2-y	+= read.o nodemgmt.o readinode.o write.o scan.o gc.o
 jffs2-y	+= symlink.o build.o erase.o background.o fs.o writev.o
 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_FS_WRITEBUFFER)	+= 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/fs.c

@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: fs.c,v 1.52 2005/02/09 09:17:40 pavlov Exp $
+ * $Id: fs.c,v 1.53 2005/02/09 09:23:53 pavlov Exp $
  *
  */
 
@@ -450,13 +450,11 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
 
 	c = JFFS2_SB_INFO(sb);
 
-#ifndef CONFIG_JFFS2_FS_NAND
+#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
 	if (c->mtd->type == MTD_NANDFLASH) {
 		printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
 		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;

fs/jffs2/nodelist.h

@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.h,v 1.126 2004/11/19 15:06:29 dedekind Exp $
+ * $Id: nodelist.h,v 1.127 2005/02/09 09:23:53 pavlov Exp $
  *
  */
 
@@ -462,7 +462,7 @@ int jffs2_do_mount_fs(struct jffs2_sb_info *c);
 /* erase.c */
 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count);
 
-#ifdef CONFIG_JFFS2_FS_NAND
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 /* wbuf.c */
 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);

fs/jffs2/os-linux.h

@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: os-linux.h,v 1.53 2005/02/09 09:17:41 pavlov Exp $
+ * $Id: os-linux.h,v 1.54 2005/02/09 09:23:53 pavlov Exp $
  *
  */
 
@@ -97,16 +97,12 @@ 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 && !defined CONFIG_JFFS2_FS_DATAFLASH)
+#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
+#define SECTOR_ADDR(x) ( ((unsigned long)(x) & ~(c->sector_size-1)) )
 #define jffs2_can_mark_obsolete(c) (1)
 #define jffs2_cleanmarker_oob(c) (0)
 #define jffs2_write_nand_cleanmarker(c,jeb) (-EIO)
@@ -129,6 +125,7 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
 
 #else /* NAND and/or ECC'd NOR support present */
 
+#define SECTOR_ADDR(x) ( ((unsigned long)(x) / (unsigned long)(c->sector_size)) * c->sector_size )
 #define jffs2_can_mark_obsolete(c) ((c->mtd->type == MTD_NORFLASH && !(c->mtd->flags & MTD_ECC)) || c->mtd->type == MTD_RAM)
 #define jffs2_cleanmarker_oob(c) (c->mtd->type == MTD_NANDFLASH)
 
@@ -150,25 +147,16 @@ int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
 int jffs2_nand_flash_setup(struct jffs2_sb_info *c);
 void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c);
-#ifdef CONFIG_JFFS2_FS_NOR_ECC
+
 #define jffs2_nor_ecc(c) (c->mtd->type == MTD_NORFLASH && (c->mtd->flags & MTD_ECC))
 int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c);
 void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c);
-#else
-#define jffs2_nor_ecc(c) (0)
-#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 */
+
+#endif /* WRITEBUFFER */
 
 /* erase.c */
 static inline void jffs2_erase_pending_trigger(struct jffs2_sb_info *c)

fs/jffs2/scan.c

@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: scan.c,v 1.117 2005/02/09 09:17:41 pavlov Exp $
+ * $Id: scan.c,v 1.118 2005/02/09 09:23:53 pavlov Exp $
  *
  */
 #include <linux/kernel.h>
@@ -68,7 +68,7 @@ static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblo
 static inline int min_free(struct jffs2_sb_info *c)
 {
 	uint32_t min = 2 * sizeof(struct jffs2_raw_inode);
-#if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC || defined CONFIG_JFFS2_FS_DATAFLASH
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize)
 		return c->wbuf_pagesize;
 #endif
@@ -228,7 +228,7 @@ int jffs2_scan_medium(struct jffs2_sb_info *c)
 		c->dirty_size -= c->nextblock->dirty_size;
 		c->nextblock->dirty_size = 0;
 	}
-#if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC || defined CONFIG_JFFS2_FS_DATAFLASH
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	if (!jffs2_can_mark_obsolete(c) && c->nextblock && (c->nextblock->free_size & (c->wbuf_pagesize-1))) {
 		/* If we're going to start writing into a block which already 
 		   contains data, and the end of the data isn't page-aligned,
@@ -294,7 +294,7 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 	uint32_t hdr_crc, buf_ofs, buf_len;
 	int err;
 	int noise = 0;
-#ifdef CONFIG_JFFS2_FS_NAND
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	int cleanmarkerfound = 0;
 #endif
 
@@ -303,7 +303,7 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 
 	D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
 
-#ifdef CONFIG_JFFS2_FS_NAND
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	if (jffs2_cleanmarker_oob(c)) {
 		int ret = jffs2_check_nand_cleanmarker(c, jeb);
 		D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
@@ -338,7 +338,7 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 		ofs += 4;
 
 	if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) {
-#ifdef CONFIG_JFFS2_FS_NAND
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 		if (jffs2_cleanmarker_oob(c)) {
 			/* scan oob, take care of cleanmarker */
 			int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);

fs/jffs2/super.c

@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: super.c,v 1.104 2004/11/23 15:37:31 gleixner Exp $
+ * $Id: super.c,v 1.105 2005/02/09 09:23:54 pavlov Exp $
  *
  */
 
@@ -309,7 +309,7 @@ static int __init init_jffs2_fs(void)
 	int ret;
 
 	printk(KERN_INFO "JFFS2 version 2.2."
-#ifdef CONFIG_JFFS2_FS_NAND
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	       " (NAND)"
 #endif
 	       " (C) 2001-2003 Red Hat, Inc.\n");

fs/jffs2/wbuf.c

@@ -9,7 +9,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: wbuf.c,v 1.88 2005/02/09 09:17:41 pavlov Exp $
+ * $Id: wbuf.c,v 1.89 2005/02/09 09:23:54 pavlov Exp $
  *
  */
 
@@ -604,7 +604,7 @@ int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
 	return ret;
 }
 
-#ifdef CONFIG_JFFS2_FS_DATAFLASH
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 #define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
 #define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
 #else
@@ -1198,7 +1198,6 @@ void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
 	kfree(c->wbuf);
 }
 
-#ifdef CONFIG_JFFS2_FS_DATAFLASH
 int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
 	c->cleanmarker_size = 0;		/* No cleanmarkers needed */
 	
@@ -1219,9 +1218,7 @@ int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
 void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
 	kfree(c->wbuf);
 }
-#endif
 
-#ifdef CONFIG_JFFS2_FS_NOR_ECC
 int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
 	/* Cleanmarker is actually larger on the flashes */
 	c->cleanmarker_size = 16;
@@ -1241,4 +1238,3 @@ int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
 void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) {
 	kfree(c->wbuf);
 }
-#endif

include/linux/jffs2_fs_sb.h

@@ -1,4 +1,4 @@
-/* $Id: jffs2_fs_sb.h,v 1.49 2005/02/09 09:17:41 pavlov Exp $ */
+/* $Id: jffs2_fs_sb.h,v 1.50 2005/02/09 09:23:55 pavlov Exp $ */
 
 #ifndef _JFFS2_FS_SB
 #define _JFFS2_FS_SB
@@ -94,7 +94,7 @@ struct jffs2_sb_info {
 	   to an obsoleted node. I don't like this. Alternatives welcomed. */
 	struct semaphore erase_free_sem;
 
-#if defined CONFIG_JFFS2_FS_NAND || defined CONFIG_JFFS2_FS_NOR_ECC || defined CONFIG_JFFS2_FS_DATAFLASH
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	/* Write-behind buffer for NAND flash */
 	unsigned char *wbuf;
 	uint32_t wbuf_ofs;