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authorRichard Weinberger <richard@nod.at>2016-10-19 23:46:39 +0200
committerRichard Weinberger <richard@nod.at>2016-12-12 23:07:38 +0100
commitfc4b891bbefa73b496bb44b076bb5274b6bfba68 (patch)
tree9ba963d538c16866a148dea20c426b89b815d4c6 /fs/ubifs/sb.c
parente021986ee4119e487febb9a5f077ec77dff85865 (diff)
downloadlinux-fc4b891bbefa73b496bb44b076bb5274b6bfba68.tar.bz2
ubifs: Raise write version to 5
Starting with version 5 the following properties change: - UBIFS_FLG_DOUBLE_HASH is mandatory - UBIFS_FLG_ENCRYPTION is optional but depdens on UBIFS_FLG_DOUBLE_HASH - Filesystems with unknown super block flags will be rejected, this allows us in future to add new features without raising the UBIFS write version. Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/sb.c')
-rw-r--r--fs/ubifs/sb.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 54cef70ea16f..7f1ead29e727 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -466,6 +466,16 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
goto failed;
}
+ if (!c->double_hash && c->fmt_version >= 5) {
+ err = 16;
+ goto failed;
+ }
+
+ if (c->encrypted && c->fmt_version < 5) {
+ err = 17;
+ goto failed;
+ }
+
return 0;
failed:
@@ -624,6 +634,13 @@ int ubifs_read_superblock(struct ubifs_info *c)
c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH);
c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION);
+ if ((sup_flags & ~UBIFS_FLG_MASK) != 0) {
+ ubifs_err(c, "Unknown feature flags found: %#x",
+ sup_flags & ~UBIFS_FLG_MASK);
+ err = -EINVAL;
+ goto out;
+ }
+
#ifndef CONFIG_UBIFS_FS_ENCRYPTION
if (c->encrypted) {
ubifs_err(c, "file system contains encrypted files but UBIFS"