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    SubjectRe: [PATCH] ext2: Don't export ext2_mask_flags() to user space
    On 2012-03-22, at 11:31, Al Viro <> wrote:

    > On Thu, Mar 22, 2012 at 12:28:25PM -0400, Ted Ts'o wrote:
    >> Even if they're not iwlling to use libext2fs (for space reasons, I
    >> would assume? It can't be because of license compatibility issues
    >> since they are both GPLv2), they could just simply grab the ext2_fs.h
    >> from e2fsprogs. That has all of the file system definitions for ext2,
    >> ext3, and ext4.
    > Ho-hum... Then we could kill a lot of lines in include/linux/ext2_fs.h.
    > I wonder how much of what remains has any business being outside of
    > fs/ext2, actually - AFAICS, there are very few places that might possibly
    > care:
    > arch/blackfin/kernel/setup.c:595: if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
    > fs/nfsd/nfs3proc.c:599: case EXT2_SUPER_MAGIC:
    > fs/nfsd/nfs3proc.c:600: resp->p_link_max = EXT2_LINK_MAX;
    > fs/nfsd/nfs3proc.c:601: resp->p_name_max = EXT2_NAME_LEN;

    These don't really make sense to be using ext2 constants.

    > init/do_mounts_rd.c:57: struct ext2_super_block *ext2sb;
    > init/do_mounts_rd.c:70: ext2sb = (struct ext2_super_block *) buf;
    > init/do_mounts_rd.c:153: if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) {
    > init/do_mounts_rd.c:155: "RAMDISK: ext2 filesystem found at block %d\n",
    > init/do_mounts_rd.c:157: nblocks = le32_to_cpu(ext2sb->s_blocks_count) <<
    > init/do_mounts_rd.c:158: le32_to_cpu(ext2sb->s_log_block_size);
    > security/selinux/hooks.c:2974: case EXT2_IOC_GETFLAGS:
    > security/selinux/hooks.c:2976: case EXT2_IOC_GETVERSION:
    > security/selinux/hooks.c:2980: case EXT2_IOC_SETFLAGS:
    > security/selinux/hooks.c:2982: case EXT2_IOC_SETVERSION:

    These ones should be using the generic FS_IOC_{GET,SET}_FLAGS.

    It isn't clear that there is any legitimate use for EXT2_IOC_SETVERSION, since it isn't possible to allocate specific inode numbers, so there isn't really any use to set the inode version. Ostensibly it was for user-space NFS, but it can't be used for this, and we are planning to deprecate it from ext2/3/4 already due to incompatibility with the metadata checksum feature.

    > and that's it. blackfin and do_mounts_rd are doing the same thing (blackfin -
    > buggy, AFAICS). Looks like both are asking for something along the lines of
    > sector_t detect_ext2(void *image), returning 0 if it's not one and size in
    > kilobytes if it is... nfsd one is just plain weird; what the hell is going
    > on there? And selinux wants to know 4 ioctl numbers.
    > Everything else doesn't go beyond fs/ext2; there's a couple of odd macros
    > but they are not used anywhere *and* EXT2_FEATURE_COMPAT_EXT_ATTR is not
    > available in the places that include those headers...
    > *and*
    > --
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