ceph: add acl for cephfs
Signed-off-by: Guangliang Zhao <lucienchao@gmail.com> Reviewed-by: Li Wang <li.wang@ubuntykylin.com> Reviewed-by: Zheng Yan <zheng.z.yan@intel.com>
This commit is contained in:
Guangliang Zhao
committed by
Ilya Dryomov
Ilya Dryomov
parent
61f6881621
commit
7221fe4c2e
332
fs/ceph/acl.c
Normal file
332
fs/ceph/acl.c
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@@ -0,0 +1,332 @@
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/*
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* linux/fs/ceph/acl.c
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*
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* Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/ceph/ceph_debug.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "super.h"
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static inline void ceph_set_cached_acl(struct inode *inode,
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int type, struct posix_acl *acl)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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spin_lock(&ci->i_ceph_lock);
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if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
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set_cached_acl(inode, type, acl);
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spin_unlock(&ci->i_ceph_lock);
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}
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static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode,
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int type)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct posix_acl *acl = ACL_NOT_CACHED;
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spin_lock(&ci->i_ceph_lock);
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if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
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acl = get_cached_acl(inode, type);
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spin_unlock(&ci->i_ceph_lock);
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return acl;
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}
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void ceph_forget_all_cached_acls(struct inode *inode)
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{
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forget_all_cached_acls(inode);
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}
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struct posix_acl *ceph_get_acl(struct inode *inode, int type)
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{
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int size;
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const char *name;
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char *value = NULL;
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struct posix_acl *acl;
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if (!IS_POSIXACL(inode))
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return NULL;
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acl = ceph_get_cached_acl(inode, type);
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if (acl != ACL_NOT_CACHED)
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return acl;
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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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size = __ceph_getxattr(inode, name, "", 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 = __ceph_getxattr(inode, name, value, size);
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}
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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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else if (size == -ERANGE || size == -ENODATA || size == 0)
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acl = NULL;
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else
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acl = ERR_PTR(-EIO);
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kfree(value);
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if (!IS_ERR(acl))
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ceph_set_cached_acl(inode, type, acl);
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return acl;
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}
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static int ceph_set_acl(struct dentry *dentry, struct inode *inode,
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struct posix_acl *acl, int type)
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{
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int ret = 0, size = 0;
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const char *name = NULL;
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char *value = NULL;
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struct iattr newattrs;
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umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
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if (acl) {
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ret = posix_acl_valid(acl);
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if (ret < 0)
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goto out;
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}
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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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if (acl) {
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ret = posix_acl_equiv_mode(acl, &new_mode);
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if (ret < 0)
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goto out;
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if (ret == 0)
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acl = NULL;
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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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ret = acl ? -EINVAL : 0;
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goto out;
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}
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name = POSIX_ACL_XATTR_DEFAULT;
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break;
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default:
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ret = -EINVAL;
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goto out;
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}
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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_NOFS);
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if (!value) {
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ret = -ENOMEM;
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goto out;
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}
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ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
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if (ret < 0)
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goto out_free;
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}
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if (new_mode != old_mode) {
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newattrs.ia_mode = new_mode;
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newattrs.ia_valid = ATTR_MODE;
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ret = ceph_setattr(dentry, &newattrs);
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if (ret)
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goto out_free;
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}
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if (value)
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ret = __ceph_setxattr(dentry, name, value, size, 0);
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else
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ret = __ceph_removexattr(dentry, name);
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if (ret) {
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if (new_mode != old_mode) {
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newattrs.ia_mode = old_mode;
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newattrs.ia_valid = ATTR_MODE;
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ceph_setattr(dentry, &newattrs);
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}
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goto out_free;
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}
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ceph_set_cached_acl(inode, type, acl);
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out_free:
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kfree(value);
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out:
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return ret;
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}
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int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
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{
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struct posix_acl *acl = NULL;
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int ret = 0;
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if (!S_ISLNK(inode->i_mode)) {
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if (IS_POSIXACL(dir)) {
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acl = ceph_get_acl(dir, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl)) {
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ret = PTR_ERR(acl);
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goto out;
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}
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}
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if (!acl)
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inode->i_mode &= ~current_umask();
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}
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if (IS_POSIXACL(dir) && acl) {
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if (S_ISDIR(inode->i_mode)) {
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ret = ceph_set_acl(dentry, inode, acl,
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ACL_TYPE_DEFAULT);
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if (ret)
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goto out_release;
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}
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ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
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if (ret < 0)
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goto out;
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else if (ret > 0)
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ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
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else
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cache_no_acl(inode);
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} else {
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cache_no_acl(inode);
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}
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out_release:
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posix_acl_release(acl);
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out:
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return ret;
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}
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int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
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{
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struct posix_acl *acl;
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int ret = 0;
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if (S_ISLNK(inode->i_mode)) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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if (!IS_POSIXACL(inode))
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goto out;
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acl = ceph_get_acl(inode, ACL_TYPE_ACCESS);
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if (IS_ERR_OR_NULL(acl)) {
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ret = PTR_ERR(acl);
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goto out;
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}
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ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
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if (ret)
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goto out;
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ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
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posix_acl_release(acl);
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out:
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return ret;
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}
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static int ceph_xattr_acl_get(struct dentry *dentry, const char *name,
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void *value, size_t size, int type)
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{
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struct posix_acl *acl;
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int ret = 0;
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if (!IS_POSIXACL(dentry->d_inode))
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return -EOPNOTSUPP;
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acl = ceph_get_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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ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
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posix_acl_release(acl);
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return ret;
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}
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static int ceph_xattr_acl_set(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags, int type)
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{
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int ret = 0;
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struct posix_acl *acl = NULL;
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if (!inode_owner_or_capable(dentry->d_inode)) {
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ret = -EPERM;
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goto out;
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}
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if (!IS_POSIXACL(dentry->d_inode)) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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if (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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ret = PTR_ERR(acl);
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goto out;
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}
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if (acl) {
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ret = posix_acl_valid(acl);
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if (ret)
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goto out_release;
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}
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}
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ret = ceph_set_acl(dentry, dentry->d_inode, acl, type);
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out_release:
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posix_acl_release(acl);
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out:
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return ret;
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}
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const struct xattr_handler ceph_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 = ceph_xattr_acl_get,
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.set = ceph_xattr_acl_set,
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};
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const struct xattr_handler ceph_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 = ceph_xattr_acl_get,
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.set = ceph_xattr_acl_set,
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};
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