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authorMatthew L. Creech <mlcreech@gmail.com>2011-05-06 00:33:20 +0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-16 15:12:14 +0400
commit9f58d3503a1368673609db1962e4a584261b62eb (patch)
tree9b31f7f6f6c8513d80b5e807f029d225c9be9b25 /fs/ubifs/ubifs-media.h
parente11602ea3e43392904db7a579dc990062ebb7151 (diff)
downloadlinux-9f58d3503a1368673609db1962e4a584261b62eb.tar.xz
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>
Diffstat (limited to 'fs/ubifs/ubifs-media.h')
-rw-r--r--fs/ubifs/ubifs-media.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index b922f03c31ae..e24380cf46ed 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -408,9 +408,11 @@ enum {
* Superblock flags.
*
* UBIFS_FLG_BIGLPT: if "big" LPT model is used if set
+ * UBIFS_FLG_SPACE_FIXUP: first-mount "fixup" of free space within LEBs needed
*/
enum {
UBIFS_FLG_BIGLPT = 0x02,
+ UBIFS_FLG_SPACE_FIXUP = 0x04,
};
/**