tree 9b31f7f6f6c8513d80b5e807f029d225c9be9b25
parent e11602ea3e43392904db7a579dc990062ebb7151
author Matthew L. Creech <mlcreech@gmail.com> 1304627600 -0400
committer Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1305544334 +0300

UBIFS: add a superblock flag for free space fix-up

The 'space_fixup' flag can be set in the superblock of a new filesystem by
mkfs.ubifs to indicate that any eraseblocks with free space remaining should be
fixed-up the first time it's mounted (after which the flag is un-set). This
means that the UBIFS image has been flashed by a "dumb" flasher and the free
space has been actually programmed (writing all 0xFFs), so this free space
cannot be used. UBIFS fixes the free space up by re-writing the contents of all
LEBs with free space using the atomic LEB change UBI operation.

Artem: improved commit message, add some more commentaries to the code.

Signed-off-by: Matthew L. Creech <mlcreech@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>