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![Christian Brauner](/assets/img/avatar_default.png)
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b
("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
159 lines
4 KiB
C
159 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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#include "protocol.h"
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#include "orangefs-kernel.h"
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#include "orangefs-bufmap.h"
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#include <linux/posix_acl_xattr.h>
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struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu)
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{
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struct posix_acl *acl;
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int ret;
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char *key = NULL, *value = NULL;
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if (rcu)
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return ERR_PTR(-ECHILD);
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switch (type) {
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case ACL_TYPE_ACCESS:
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key = XATTR_NAME_POSIX_ACL_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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key = XATTR_NAME_POSIX_ACL_DEFAULT;
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break;
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default:
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gossip_err("orangefs_get_acl: bogus value of type %d\n", type);
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return ERR_PTR(-EINVAL);
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}
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/*
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* Rather than incurring a network call just to determine the exact
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* length of the attribute, I just allocate a max length to save on
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* the network call. Conceivably, we could pass NULL to
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* orangefs_inode_getxattr() to probe the length of the value, but
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* I don't do that for now.
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*/
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value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL);
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if (!value)
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return ERR_PTR(-ENOMEM);
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gossip_debug(GOSSIP_ACL_DEBUG,
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"inode %pU, key %s, type %d\n",
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get_khandle_from_ino(inode),
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key,
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type);
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ret = orangefs_inode_getxattr(inode, key, value,
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ORANGEFS_MAX_XATTR_VALUELEN);
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/* if the key exists, convert it to an in-memory rep */
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if (ret > 0) {
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acl = posix_acl_from_xattr(&init_user_ns, value, ret);
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} else if (ret == -ENODATA || ret == -ENOSYS) {
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acl = NULL;
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} else {
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gossip_err("inode %pU retrieving acl's failed with error %d\n",
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get_khandle_from_ino(inode),
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ret);
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acl = ERR_PTR(ret);
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}
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/* kfree(NULL) is safe, so don't worry if value ever got used */
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kfree(value);
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return acl;
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}
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int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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int error = 0;
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void *value = NULL;
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size_t size = 0;
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const char *name = NULL;
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switch (type) {
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case ACL_TYPE_ACCESS:
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name = XATTR_NAME_POSIX_ACL_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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name = XATTR_NAME_POSIX_ACL_DEFAULT;
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break;
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default:
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gossip_err("%s: invalid type %d!\n", __func__, type);
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return -EINVAL;
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}
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gossip_debug(GOSSIP_ACL_DEBUG,
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"%s: inode %pU, key %s type %d\n",
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__func__, get_khandle_from_ino(inode),
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name,
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type);
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if (acl) {
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size = posix_acl_xattr_size(acl->a_count);
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value = kmalloc(size, GFP_KERNEL);
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if (!value)
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return -ENOMEM;
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error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
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if (error < 0)
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goto out;
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}
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gossip_debug(GOSSIP_ACL_DEBUG,
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"%s: name %s, value %p, size %zd, acl %p\n",
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__func__, name, value, size, acl);
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/*
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* Go ahead and set the extended attribute now. NOTE: Suppose acl
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* was NULL, then value will be NULL and size will be 0 and that
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* will xlate to a removexattr. However, we don't want removexattr
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* complain if attributes does not exist.
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*/
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error = orangefs_inode_setxattr(inode, name, value, size, 0);
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out:
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kfree(value);
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if (!error)
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set_cached_acl(inode, type, acl);
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return error;
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}
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int orangefs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
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struct posix_acl *acl, int type)
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{
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int error;
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struct iattr iattr;
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int rc;
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struct inode *inode = d_inode(dentry);
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memset(&iattr, 0, sizeof iattr);
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if (type == ACL_TYPE_ACCESS && acl) {
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/*
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* posix_acl_update_mode checks to see if the permissions
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* described by the ACL can be encoded into the
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* object's mode. If so, it sets "acl" to NULL
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* and "mode" to the new desired value. It is up to
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* us to propagate the new mode back to the server...
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*/
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error = posix_acl_update_mode(&nop_mnt_idmap, inode,
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&iattr.ia_mode, &acl);
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if (error) {
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gossip_err("%s: posix_acl_update_mode err: %d\n",
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__func__,
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error);
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return error;
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}
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if (inode->i_mode != iattr.ia_mode)
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iattr.ia_valid = ATTR_MODE;
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}
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rc = __orangefs_set_acl(inode, acl, type);
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if (!rc && (iattr.ia_valid == ATTR_MODE))
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rc = __orangefs_setattr_mode(dentry, &iattr);
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return rc;
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}
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