On Fri, Oct 07, 2011 at 12:10:59AM -0700, Allison Henderson wrote:
> 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 <achender@xxxxxxxxxxxxxxxxxx>
> ---
> :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 */
Is there a reason why this #define is 0x104BDFFF instead of a bunch of flags
or'd together in a manner similar to the one below it?
--D
>
> /* 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
>
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