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| author | Matthew L. Creech <mlcreech@gmail.com> | 2011-05-06 00:33:20 +0400 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-05-16 15:12:14 +0400 |
| commit | 9f58d3503a1368673609db1962e4a584261b62eb (patch) | |
| tree | 9b31f7f6f6c8513d80b5e807f029d225c9be9b25 /fs/ubifs/sb.c | |
| parent | e11602ea3e43392904db7a579dc990062ebb7151 (diff) | |
| download | linux-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/sb.c')
| -rw-r--r-- | fs/ubifs/sb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index cad60b51f7c4..93d69289d6f4 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -617,6 +617,7 @@ int ubifs_read_superblock(struct ubifs_info *c) c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran); memcpy(&c->uuid, &sup->uuid, 16); c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT); + c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP); /* Automatically increase file system size to the maximum size */ c->old_leb_cnt = c->leb_cnt; |