mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e409de992e
Now that the xattr handler is passed to the xattr handler operations, we can use the same get and set operations for the user, trusted, and security xattr namespaces. In those namespaces, we can access the full attribute name by "reattaching" the name prefix the vfs has skipped for us. Add a xattr_full_name helper to make this obvious in the code. For the "system.posix_acl_access" and "system.posix_acl_default" attributes, handler->prefix is the full attribute name; the suffix is the empty string. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: v9fs-developer@lists.sourceforge.net Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
343 lines
8.1 KiB
C
343 lines
8.1 KiB
C
/*
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* Copyright IBM Corporation, 2010
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/posix_acl_xattr.h>
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#include "xattr.h"
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#include "acl.h"
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
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{
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ssize_t size;
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void *value = NULL;
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struct posix_acl *acl = NULL;
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size = v9fs_fid_xattr_get(fid, name, NULL, 0);
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if (size > 0) {
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value = kzalloc(size, GFP_NOFS);
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if (!value)
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return ERR_PTR(-ENOMEM);
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size = v9fs_fid_xattr_get(fid, name, value, size);
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if (size > 0) {
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acl = posix_acl_from_xattr(&init_user_ns, value, size);
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if (IS_ERR(acl))
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goto err_out;
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}
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} else if (size == -ENODATA || size == 0 ||
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size == -ENOSYS || size == -EOPNOTSUPP) {
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acl = NULL;
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} else
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acl = ERR_PTR(-EIO);
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err_out:
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kfree(value);
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return acl;
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}
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int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
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{
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int retval = 0;
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struct posix_acl *pacl, *dacl;
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struct v9fs_session_info *v9ses;
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v9ses = v9fs_inode2v9ses(inode);
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if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
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((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
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set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
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set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
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return 0;
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}
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/* get the default/access acl values and cache them */
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dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
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pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
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if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
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set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
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set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
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} else
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retval = -EIO;
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if (!IS_ERR(dacl))
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posix_acl_release(dacl);
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if (!IS_ERR(pacl))
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posix_acl_release(pacl);
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return retval;
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}
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static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
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{
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struct posix_acl *acl;
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/*
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* 9p Always cache the acl value when
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* instantiating the inode (v9fs_inode_from_fid)
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*/
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acl = get_cached_acl(inode, type);
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BUG_ON(acl == ACL_NOT_CACHED);
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return acl;
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}
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struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
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{
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struct v9fs_session_info *v9ses;
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v9ses = v9fs_inode2v9ses(inode);
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if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
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((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
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/*
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* On access = client and acl = on mode get the acl
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* values from the server
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*/
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return NULL;
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}
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return v9fs_get_cached_acl(inode, type);
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}
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static int v9fs_set_acl(struct p9_fid *fid, int type, struct posix_acl *acl)
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{
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int retval;
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char *name;
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size_t size;
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void *buffer;
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if (!acl)
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return 0;
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/* Set a setxattr request to server */
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size = posix_acl_xattr_size(acl->a_count);
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buffer = kmalloc(size, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
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if (retval < 0)
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goto err_free_out;
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switch (type) {
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case ACL_TYPE_ACCESS:
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name = POSIX_ACL_XATTR_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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name = POSIX_ACL_XATTR_DEFAULT;
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break;
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default:
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BUG();
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}
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retval = v9fs_fid_xattr_set(fid, name, buffer, size, 0);
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err_free_out:
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kfree(buffer);
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return retval;
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}
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int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid)
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{
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int retval = 0;
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struct posix_acl *acl;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
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if (acl) {
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retval = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
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if (retval)
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return retval;
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set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
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retval = v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
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posix_acl_release(acl);
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}
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return retval;
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}
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int v9fs_set_create_acl(struct inode *inode, struct p9_fid *fid,
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struct posix_acl *dacl, struct posix_acl *acl)
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{
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set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
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set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
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v9fs_set_acl(fid, ACL_TYPE_DEFAULT, dacl);
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v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
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return 0;
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}
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void v9fs_put_acl(struct posix_acl *dacl,
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struct posix_acl *acl)
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{
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posix_acl_release(dacl);
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posix_acl_release(acl);
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}
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int v9fs_acl_mode(struct inode *dir, umode_t *modep,
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struct posix_acl **dpacl, struct posix_acl **pacl)
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{
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int retval = 0;
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umode_t mode = *modep;
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struct posix_acl *acl = NULL;
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if (!S_ISLNK(mode)) {
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acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (!acl)
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mode &= ~current_umask();
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}
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if (acl) {
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if (S_ISDIR(mode))
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*dpacl = posix_acl_dup(acl);
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retval = __posix_acl_create(&acl, GFP_NOFS, &mode);
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if (retval < 0)
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return retval;
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if (retval > 0)
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*pacl = acl;
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else
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posix_acl_release(acl);
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}
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*modep = mode;
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return 0;
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}
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static int v9fs_xattr_get_acl(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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void *buffer, size_t size)
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{
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struct v9fs_session_info *v9ses;
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struct posix_acl *acl;
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int error;
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if (strcmp(name, "") != 0)
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return -EINVAL;
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v9ses = v9fs_dentry2v9ses(dentry);
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/*
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* We allow set/get/list of acl when access=client is not specified
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*/
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if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
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return v9fs_xattr_get(dentry, handler->prefix, buffer, size);
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acl = v9fs_get_cached_acl(d_inode(dentry), handler->flags);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl == NULL)
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return -ENODATA;
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error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
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posix_acl_release(acl);
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return error;
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}
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static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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int retval;
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struct posix_acl *acl;
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struct v9fs_session_info *v9ses;
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struct inode *inode = d_inode(dentry);
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if (strcmp(name, "") != 0)
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return -EINVAL;
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v9ses = v9fs_dentry2v9ses(dentry);
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/*
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* set the attribute on the remote. Without even looking at the
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* xattr value. We leave it to the server to validate
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*/
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if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
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return v9fs_xattr_set(dentry, handler->prefix, value, size,
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flags);
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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if (!inode_owner_or_capable(inode))
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return -EPERM;
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if (value) {
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/* update the cached acl value */
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acl = posix_acl_from_xattr(&init_user_ns, value, size);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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else if (acl) {
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retval = posix_acl_valid(acl);
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if (retval)
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goto err_out;
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}
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} else
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acl = NULL;
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switch (handler->flags) {
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case ACL_TYPE_ACCESS:
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if (acl) {
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umode_t mode = inode->i_mode;
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retval = posix_acl_equiv_mode(acl, &mode);
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if (retval < 0)
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goto err_out;
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else {
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struct iattr iattr;
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if (retval == 0) {
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/*
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* ACL can be represented
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* by the mode bits. So don't
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* update ACL.
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*/
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acl = NULL;
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value = NULL;
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size = 0;
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}
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/* Updte the mode bits */
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iattr.ia_mode = ((mode & S_IALLUGO) |
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(inode->i_mode & ~S_IALLUGO));
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iattr.ia_valid = ATTR_MODE;
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/* FIXME should we update ctime ?
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* What is the following setxattr update the
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* mode ?
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*/
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v9fs_vfs_setattr_dotl(dentry, &iattr);
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}
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}
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode)) {
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retval = acl ? -EINVAL : 0;
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goto err_out;
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}
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break;
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default:
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BUG();
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}
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retval = v9fs_xattr_set(dentry, handler->prefix, value, size, flags);
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if (!retval)
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set_cached_acl(inode, handler->flags, acl);
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err_out:
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posix_acl_release(acl);
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return retval;
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}
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const struct xattr_handler v9fs_xattr_acl_access_handler = {
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.prefix = POSIX_ACL_XATTR_ACCESS,
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.flags = ACL_TYPE_ACCESS,
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.get = v9fs_xattr_get_acl,
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.set = v9fs_xattr_set_acl,
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};
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const struct xattr_handler v9fs_xattr_acl_default_handler = {
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.prefix = POSIX_ACL_XATTR_DEFAULT,
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.flags = ACL_TYPE_DEFAULT,
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.get = v9fs_xattr_get_acl,
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.set = v9fs_xattr_set_acl,
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};
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