[Ext4 Secure Delete 1/7v4] ext4: Secure Delete: Add new EXT4_SECRM_RANDOM_FL flag
From: Allison Henderson <hidden>
Date: 2011-10-07 07:10:59
Also in:
linux-fsdevel
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
This patch adds a new attribute flag EXT4_SECRM_RANDOM_FL. During a secure delete, this flag will cause blocks to be overwritten with random data instead of zeros. Signed-off-by: Allison Henderson <redacted> --- :100644 100644 e717dfd... db54ce4... M fs/ext4/ext4.h fs/ext4/ext4.h | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e717dfd..db54ce4 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h@@ -350,17 +350,18 @@ struct flex_groups { #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ +#define EXT4_SECRM_RANDOM_FL 0x10000000 /* Use random data instead of zeros */ #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ -#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ -#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ +#define EXT4_FL_USER_VISIBLE 0x104BDFFF /* User visible flags */ +#define EXT4_FL_USER_MODIFIABLE 0x104B80FF /* User modifiable flags */ /* Flags that should be inherited by new inodes from their parent. */ #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ - EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) + EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL | EXT4_SECRM_RANDOM_FL) /* Flags that are appropriate for regular files (all but dir-specific ones). */ #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
@@ -407,6 +408,7 @@ enum { EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ + EXT4_INODE_SECRM_RANDOM = 28, /* Use random data instead of zeros */ EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ };
@@ -453,6 +455,7 @@ static inline void ext4_check_flag_values(void) CHECK_FLAG_VALUE(EXTENTS); CHECK_FLAG_VALUE(EA_INODE); CHECK_FLAG_VALUE(EOFBLOCKS); + CHECK_FLAG_VALUE(SECRM_RANDOM); CHECK_FLAG_VALUE(RESERVED); }
--
1.7.1