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ubifs: Raise write version to 5

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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>
This commit is contained in:
Richard Weinberger 2016-10-19 23:46:39 +02:00
parent e021986ee4
commit fc4b891bbe
2 changed files with 20 additions and 1 deletions
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17
fs/ubifs/sb.c
View File

@ -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"

4
fs/ubifs/ubifs-media.h
View File

@ -46,7 +46,7 @@
* UBIFS went into mainline kernel with format version 4. The older formats
* were development formats.
*/
#define UBIFS_FORMAT_VERSION 4
#define UBIFS_FORMAT_VERSION 5
/*
* Read-only compatibility version. If the UBIFS format is changed, older UBIFS
@ -429,6 +429,8 @@ enum {
UBIFS_FLG_ENCRYPTION = 0x10,
};
#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT|UBIFS_FLG_SPACE_FIXUP|UBIFS_FLG_DOUBLE_HASH|UBIFS_FLG_ENCRYPTION)
/**
* struct ubifs_ch - common header node.
* @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC)