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    SubjectRe: [PATCH] ext2: Don't export ext2_mask_flags() to user space
    On Thu, Mar 22, 2012 at 13:31, Al Viro wrote:
    > On Thu, Mar 22, 2012 at 12:28:25PM -0400, Ted Ts'o wrote:
    >> On Thu, Mar 22, 2012 at 08:00:41AM +0200, Artem Bityutskiy wrote:
    >> > On Thu, 2012-03-22 at 06:53 +0100, Thierry Reding wrote:
    >> > > What's the recommended fix for packages that cannot or will not use
    >> > > libext2fs, like busybox? Copy the required parts into a private header
    >> > > and use that instead?
    >> >
    >> > The normal way is to just keep a private copy of the whole header file.
    >> > Because the on-disk format stays compatible, those programs do not have
    >> > to update the header very often - only rarely if they want to support
    >> > some new feature.
    >> 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;
    > 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:
    > and that's it.  blackfin and do_mounts_rd are doing the same thing (blackfin -
    > buggy, AFAICS).

    buggy how ? they're not exactly the same as the Blackfin code is
    setting things up for the uClinux MTD map. it isn't parsing the
    filesystem itself (ignoring the size extraction from the superblock).

    > 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...

    yes, that would be fine
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