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fs: jffs2: Move SYS_JFFS2_SORT_FRAGMENTS to Kconfig

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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>
This commit is contained in:
Tom Rini 2022-10-28 20:26:59 -04:00
parent e020b974ce
commit 3b677dcd9d
2 changed files with 12 additions and 30 deletions
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30
doc/README.JFFS2
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@ -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).

12
fs/jffs2/Kconfig
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@ -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!