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This patch allows the endianness of the JFSS2 filesystem to be
specified by config options.
It defaults to native-endian (the previously hard-coded option).
Some architectures (in particular, the NSLU2) benefit from having a
single known endianness of JFFS2 filesystem (for data, not
executables) independent of the endianness of the processor (ARM
processors can be switched to either endianness at run-time).
Signed-off-by: Rod Whitby <rod@whitby.id.au>
fs/Kconfig | 25 +++++++++++++++++++++++++
fs/jffs2/nodelist.h | 8 +++-----
2 files changed, 28 insertions(+), 5 deletions(-)
--- linux-nslu2.orig/fs/Kconfig 2006-02-06 20:38:09.000000000 +0100
+++ linux-nslu2/fs/Kconfig 2006-02-06 21:49:07.000000000 +0100
@@ -1174,6 +1174,31 @@ config JFFS2_CMODE_SIZE
endchoice
+choice
+ prompt "JFFS2 endianness"
+ default JFFS2_NATIVE_ENDIAN
+ depends on JFFS2_FS
+ help
+ You can set here the default endianness of JFFS2 from
+ the available options. Don't touch if unsure.
+
+config JFFS2_NATIVE_ENDIAN
+ bool "native endian"
+ help
+ Uses a native endian bytestream.
+
+config JFFS2_BIG_ENDIAN
+ bool "big endian"
+ help
+ Uses a big endian bytestream.
+
+config JFFS2_LITTLE_ENDIAN
+ bool "little endian"
+ help
+ Uses a little endian bytestream.
+
+endchoice
+
config CRAMFS
tristate "Compressed ROM file system support (cramfs)"
select ZLIB_INFLATE
--- linux-nslu2.orig/fs/jffs2/nodelist.h 2006-02-06 20:35:36.000000000 +0100
+++ linux-nslu2/fs/jffs2/nodelist.h 2006-02-06 21:49:07.000000000 +0100
@@ -29,12 +29,10 @@
#include "os-linux.h"
#endif
-#define JFFS2_NATIVE_ENDIAN
-
/* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from
whatever OS we're actually running on here too. */
-#if defined(JFFS2_NATIVE_ENDIAN)
+#if defined(CONFIG_JFFS2_NATIVE_ENDIAN)
#define cpu_to_je16(x) ((jint16_t){x})
#define cpu_to_je32(x) ((jint32_t){x})
#define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)})
@@ -42,7 +40,7 @@
#define je16_to_cpu(x) ((x).v16)
#define je32_to_cpu(x) ((x).v32)
#define jemode_to_cpu(x) (jffs2_to_os_mode((x).m))
-#elif defined(JFFS2_BIG_ENDIAN)
+#elif defined(CONFIG_JFFS2_BIG_ENDIAN)
#define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)})
#define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)})
#define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))})
@@ -50,7 +48,7 @@
#define je16_to_cpu(x) (be16_to_cpu(x.v16))
#define je32_to_cpu(x) (be32_to_cpu(x.v32))
#define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m)))
-#elif defined(JFFS2_LITTLE_ENDIAN)
+#elif defined(CONFIG_JFFS2_LITTLE_ENDIAN)
#define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)})
#define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)})
#define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))})
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