From fc4b891bbefa73b496bb44b076bb5274b6bfba68 Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Wed, 19 Oct 2016 23:46:39 +0200 Subject: 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 --- fs/ubifs/sb.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'fs/ubifs/sb.c') 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" -- cgit v1.2.3