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| author | Matthew L. Creech <mlcreech@gmail.com> | 2011-05-05 22:33:20 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-05-16 13:12:14 +0200 |
| commit | 9f58d3503a1368673609db1962e4a584261b62eb (patch) | |
| tree | 9b31f7f6f6c8513d80b5e807f029d225c9be9b25 /fs/ubifs/ubifs-media.h | |
| parent | UBIFS: share the next_log_lnum helper (diff) | |
| download | linux-9f58d3503a1368673609db1962e4a584261b62eb.tar.xz linux-9f58d3503a1368673609db1962e4a584261b62eb.zip | |
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.h | 2 |
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, }; /** |