From: Darrick J. Wong Date: Fri, 13 Feb 2015 03:31:21 +0000 (-0500) Subject: ext4: support read-only images X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~2^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2cb5cc8b09c939c77826635956c35995b15c9331;p=pandora-kernel.git ext4: support read-only images Add a rocompat feature, "readonly" to mark a FS image as read-only. The feature prevents the kernel and e2fsprogs from changing the image; the flag can be toggled by tune2fs. Signed-off-by: Darrick J. Wong Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b7f393df2e4c..7fec2efd8635 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1530,6 +1530,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) * GDT_CSUM bits are mutually exclusive. */ #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 +#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 Reading git-diff-tree failed