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authorMatthew L. Creech <mlcreech@gmail.com>2011-05-05 16:33:20 -0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-16 14:12:14 +0300
commit9f58d3503a1368673609db1962e4a584261b62eb (patch)
tree9b31f7f6f6c8513d80b5e807f029d225c9be9b25 /fs/ubifs/sb.c
parente11602ea3e43392904db7a579dc990062ebb7151 (diff)
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.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index cad60b51f7c..93d69289d6f 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;