forked from Minki/linux
7a4566b0b8
This patch implement fetching POSIX ACL from the server Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
138 lines
3.3 KiB
C
138 lines
3.3 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/posix_acl_xattr.h>
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#include "xattr.h"
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#include "acl.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(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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/* 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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posix_acl_release(dacl);
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posix_acl_release(pacl);
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} else
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retval = -EIO;
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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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int v9fs_check_acl(struct inode *inode, int mask)
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{
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struct posix_acl *acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
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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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int error = posix_acl_permission(inode, acl, mask);
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posix_acl_release(acl);
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return error;
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}
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return -EAGAIN;
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}
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static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
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void *buffer, size_t size, int type)
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{
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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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acl = v9fs_get_cached_acl(dentry->d_inode, type);
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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(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(struct dentry *dentry, const char *name,
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const void *value, size_t size,
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int flags, int type)
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{
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return 0;
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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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