fs: jffs2: Move SYS_JFFS2_SORT_FRAGMENTS to Kconfig

Move the symbol SYS_JFFS2_SORT_FRAGMENTS to Kconfig and use the only
remaining part of doc/README.JFFS2 that is still relevant and useful to
the help for this option.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/doc/README.JFFS2 b/doc/README.JFFS2
deleted file mode 100644 (file)
index fddefb1..0000000
--- a/doc/README.JFFS2
+++ /dev/null
@@ -1,30 +0,0 @@
-JFFS2 options and usage.
------------------------
-
-JFFS2 in U-Boot is a read only implementation of the file system in
-Linux with the same name. To use JFFS2 define CONFIG_CMD_JFFS2.
-
-The module adds three new commands.
-fsload  - load binary file from a file system image
-fsinfo  - print information about file systems
-ls      - list files in a directory
-chpart  - change active partition
-
-If you do now need the commands, you can enable the filesystem separately
-with CONFIG_FS_JFFS2 and call the jffs2 functions yourself.
-
-If you boot from a partition which is mounted writable, and you
-update your boot environment by replacing single files on that
-partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning
-the JFFS2 filesystem takes *much* longer with this feature, though.
-Sorting is done while inserting into the fragment list, which is
-more or less a bubble sort. That algorithm is known to be O(n^2),
-thus you should really consider if you can avoid it!
-
----
-
-TODO.
-
-       Remove the assumption that JFFS can dereference a pointer
-       into the disk. The current code do not work with memory holes
-       or hardware with a sliding window (PCMCIA).

diff --git a/fs/jffs2/Kconfig b/fs/jffs2/Kconfig
index 0e79c34..3bf01cd 100644 (file)
--- a/fs/jffs2/Kconfig
+++ b/fs/jffs2/Kconfig
@@ -17,3 +17,15 @@ config JFFS2_NAND
        depends on FS_JFFS2
        help
          Enable support for NAND flash as the backing store for JFFS2.
+
+config SYS_JFFS2_SORT_FRAGMENTS
+       bool "Enable JFFS2 sorting of filesystem fragments (SLOW!)"
+       depends on FS_JFFS2
+       help
+         If you boot from a partition which is mounted writable, and you
+         update your boot environment by replacing single files on that
+         partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS.
+         Scanning the JFFS2 filesystem takes *much* longer with this feature,
+         though.  Sorting is done while inserting into the fragment list,
+         which is more or less a bubble sort. That algorithm is known to be
+         O(n^2), thus you should really consider if you can avoid it!