[JFFS2] Add a "favourlzo" compression mode

Add a "favourlzo" compression mode to jffs2 which tries to
optimise by size but gives lzo an advantage when comparing sizes.
This means the faster lzo algorithm can be preferred when there
isn't much difference in compressed size (the exact threshold can
be changed).

Signed-off-by: Richard Purdie <rpurdie@openedhand.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index a2ec0b375dff..42cfb7dc95b5 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1364,6 +1364,13 @@ config JFFS2_CMODE_SIZE
           Tries all compressors and chooses the one which has the smallest
           result.
 
+config JFFS2_CMODE_FAVOURLZO
+        bool "Favour LZO"
+        help
+          Tries all compressors and chooses the one which has the smallest
+          result but gives some preference to LZO (which has faster
+          decompression) at the expense of size.
+
 endchoice
 
 config CRAMFS