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    Subject[RFC v3 30/45] richacl: Create richacl from mode values
    Date
    Create a richacl that corresponds to given file mode permission bits.

    Signed-off-by: Andreas Gruenbacher <agruen@kernel.org>
    ---
    fs/richacl_compat.c | 38 ++++++++++++++++++++++++++++++++++++++
    include/linux/richacl.h | 1 +
    2 files changed, 39 insertions(+)

    diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
    index 49af600..8ebe772 100644
    --- a/fs/richacl_compat.c
    +++ b/fs/richacl_compat.c
    @@ -750,3 +750,41 @@ richacl_apply_masks(struct richacl **acl)
    return 0;
    }
    EXPORT_SYMBOL_GPL(richacl_apply_masks);
    +
    +/**
    + * richacl_from_mode_unmasked - create an acl which corresponds to @mode
    + *
    + * The resulting acl doesn't have the RICHACL_MASKED flag set.
    + *
    + * @mode: file mode including the file type
    + */
    +struct richacl *
    +richacl_from_mode_unmasked(mode_t mode)
    +{
    + struct richacl *acl;
    + struct richace *ace;
    +
    + acl = richacl_alloc(1, GFP_KERNEL);
    + if (!acl)
    + return NULL;
    + acl->a_flags = RICHACL_MASKED;
    + acl->a_owner_mask = richacl_mode_to_mask(mode >> 6) |
    + RICHACE_POSIX_OWNER_ALLOWED;
    + acl->a_group_mask = richacl_mode_to_mask(mode >> 3);
    + acl->a_other_mask = richacl_mode_to_mask(mode);
    +
    + ace = acl->a_entries;
    + ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
    + ace->e_flags = RICHACE_SPECIAL_WHO;
    + ace->e_mask = RICHACE_POSIX_ALWAYS_ALLOWED |
    + RICHACE_POSIX_MODE_ALL |
    + RICHACE_POSIX_OWNER_ALLOWED;
    + /* RICHACE_DELETE_CHILD is meaningless for non-directories. */
    + if (!S_ISDIR(mode))
    + ace->e_mask &= ~RICHACE_DELETE_CHILD;
    + ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
    +
    + return acl;
    +
    +}
    +EXPORT_SYMBOL_GPL(richacl_from_mode_unmasked);
    diff --git a/include/linux/richacl.h b/include/linux/richacl.h
    index 6a97dca..25ff4df 100644
    --- a/include/linux/richacl.h
    +++ b/include/linux/richacl.h
    @@ -327,5 +327,6 @@ extern struct richacl *richacl_create(struct inode *, struct inode *);

    /* richacl_compat.c */
    extern int richacl_apply_masks(struct richacl **);
    +extern struct richacl *richacl_from_mode_unmasked(mode_t);

    #endif /* __RICHACL_H */
    --
    2.1.0


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