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    Subject[PATCH v12 18/49] richacl: Add richacl xattr handler
    Date
    Add richacl xattr handler implementing the xattr operations based on the
    get_richacl and set_richacl inode operations.

    Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
    ---
    fs/richacl_xattr.c | 78 +++++++++++++++++++++++++++++++++++++++++++
    include/linux/richacl_xattr.h | 2 ++
    2 files changed, 80 insertions(+)

    diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
    index 38473b6..767c1f7 100644
    --- a/fs/richacl_xattr.c
    +++ b/fs/richacl_xattr.c
    @@ -18,7 +18,9 @@
    #include <linux/fs.h>
    #include <linux/slab.h>
    #include <linux/module.h>
    +#include <linux/xattr.h>
    #include <linux/richacl_xattr.h>
    +#include <uapi/linux/xattr.h>

    MODULE_LICENSE("GPL");

    @@ -161,6 +163,82 @@ richacl_to_xattr(struct user_namespace *user_ns,
    }
    EXPORT_SYMBOL_GPL(richacl_to_xattr);

    +static size_t
    +richacl_xattr_list(struct dentry *dentry, char *list, size_t list_len,
    + const char *name, size_t name_len, int handler_flags)
    +{
    + const size_t size = sizeof(XATTR_NAME_RICHACL);
    +
    + if (!IS_RICHACL(d_backing_inode(dentry)))
    + return 0;
    + if (list && size <= list_len)
    + memcpy(list, XATTR_NAME_RICHACL, size);
    + return size;
    +}
    +
    +static int
    +richacl_xattr_get(struct dentry *dentry, const char *name, void *buffer,
    + size_t buffer_size, int handler_flags)
    +{
    + struct inode *inode = d_backing_inode(dentry);
    + struct richacl *acl;
    + int error;
    +
    + if (strcmp(name, "") != 0)
    + return -EINVAL;
    + if (!IS_RICHACL(inode))
    + return EOPNOTSUPP;
    + if (S_ISLNK(inode->i_mode))
    + return -EOPNOTSUPP;
    + acl = get_richacl(inode);
    + if (IS_ERR(acl))
    + return PTR_ERR(acl);
    + if (acl == NULL)
    + return -ENODATA;
    + error = richacl_to_xattr(&init_user_ns, acl, buffer, buffer_size);
    + richacl_put(acl);
    + return error;
    +}
    +
    +static int
    +richacl_xattr_set(struct dentry *dentry, const char *name,
    + const void *value, size_t size, int flags, int handler_flags)
    +{
    + struct inode *inode = d_backing_inode(dentry);
    + struct richacl *acl = NULL;
    + int ret;
    +
    + if (strcmp(name, "") != 0)
    + return -EINVAL;
    + if (!IS_RICHACL(inode))
    + return -EOPNOTSUPP;
    + if (!inode->i_op->set_richacl)
    + return -EOPNOTSUPP;
    +
    + if (!uid_eq(current_fsuid(), inode->i_uid) &&
    + inode_permission(inode, MAY_CHMOD) &&
    + !capable(CAP_FOWNER))
    + return -EPERM;
    +
    + if (value) {
    + acl = richacl_from_xattr(&init_user_ns, value, size);
    + if (IS_ERR(acl))
    + return PTR_ERR(acl);
    + }
    +
    + ret = inode->i_op->set_richacl(inode, acl);
    + richacl_put(acl);
    + return ret;
    +}
    +
    +struct xattr_handler richacl_xattr_handler = {
    + .prefix = XATTR_NAME_RICHACL,
    + .list = richacl_xattr_list,
    + .get = richacl_xattr_get,
    + .set = richacl_xattr_set,
    +};
    +EXPORT_SYMBOL(richacl_xattr_handler);
    +
    /*
    * Fix up the uids and gids in richacl extended attributes in place.
    */
    diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
    index 7fc5ca8..45ec27a 100644
    --- a/include/linux/richacl_xattr.h
    +++ b/include/linux/richacl_xattr.h
    @@ -39,4 +39,6 @@ static inline void richacl_fix_xattr_to_user(void *value, size_t size)
    }
    #endif

    +extern struct xattr_handler richacl_xattr_handler;
    +
    #endif /* __RICHACL_XATTR_H */
    --
    2.5.0


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