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
Ilya Dryomov
Родитель
61f6881621
Коммит
7221fe4c2e
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@ -25,3 +25,16 @@ config CEPH_FSCACHE
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caching support for Ceph clients using FS-Cache
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endif
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config CEPH_FS_POSIX_ACL
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bool "Ceph POSIX Access Control Lists"
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depends on CEPH_FS
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select FS_POSIX_ACL
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help
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POSIX Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the POSIX ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N
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@ -10,3 +10,4 @@ ceph-y := super.o inode.o dir.o file.o locks.o addr.o ioctl.o \
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debugfs.o
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ceph-$(CONFIG_CEPH_FSCACHE) += cache.o
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ceph-$(CONFIG_CEPH_FS_POSIX_ACL) += acl.o
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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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@ -2464,6 +2464,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
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ceph_buffer_put(ci->i_xattrs.blob);
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ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
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ci->i_xattrs.version = version;
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ceph_forget_all_cached_acls(inode);
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}
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}
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|
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@ -693,6 +693,10 @@ static int ceph_mknod(struct inode *dir, struct dentry *dentry,
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if (!err && !req->r_reply_info.head->is_dentry)
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err = ceph_handle_notrace_create(dir, dentry);
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ceph_mdsc_put_request(req);
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if (!err)
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err = ceph_init_acl(dentry, dentry->d_inode, dir);
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if (err)
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d_drop(dentry);
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return err;
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|
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@ -1293,6 +1297,7 @@ const struct inode_operations ceph_dir_iops = {
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.getxattr = ceph_getxattr,
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.listxattr = ceph_listxattr,
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.removexattr = ceph_removexattr,
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.get_acl = ceph_get_acl,
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.mknod = ceph_mknod,
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.symlink = ceph_symlink,
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.mkdir = ceph_mkdir,
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|
|
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@ -95,6 +95,7 @@ const struct inode_operations ceph_file_iops = {
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.getxattr = ceph_getxattr,
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.listxattr = ceph_listxattr,
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.removexattr = ceph_removexattr,
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.get_acl = ceph_get_acl,
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};
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@ -680,6 +681,7 @@ static int fill_inode(struct inode *inode,
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memcpy(ci->i_xattrs.blob->vec.iov_base,
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iinfo->xattr_data, iinfo->xattr_len);
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ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
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ceph_forget_all_cached_acls(inode);
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xattr_blob = NULL;
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}
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|
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|
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@ -1612,6 +1614,7 @@ static const struct inode_operations ceph_symlink_iops = {
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.getxattr = ceph_getxattr,
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.listxattr = ceph_listxattr,
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.removexattr = ceph_removexattr,
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.get_acl = ceph_get_acl,
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};
|
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|
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/*
|
||||
|
|
@ -1685,6 +1688,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
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dirtied |= CEPH_CAP_AUTH_EXCL;
|
||||
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
|
||||
attr->ia_mode != inode->i_mode) {
|
||||
inode->i_mode = attr->ia_mode;
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req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
|
||||
mask |= CEPH_SETATTR_MODE;
|
||||
release |= CEPH_CAP_AUTH_SHARED;
|
||||
|
|
@ -1800,6 +1804,12 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
|
|||
if (inode_dirty_flags)
|
||||
__mark_inode_dirty(inode, inode_dirty_flags);
|
||||
|
||||
if (ia_valid & ATTR_MODE) {
|
||||
err = ceph_acl_chmod(dentry, inode);
|
||||
if (err)
|
||||
goto out_put;
|
||||
}
|
||||
|
||||
if (mask) {
|
||||
req->r_inode = inode;
|
||||
ihold(inode);
|
||||
|
|
@ -1819,6 +1829,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
|
|||
return err;
|
||||
out:
|
||||
spin_unlock(&ci->i_ceph_lock);
|
||||
out_put:
|
||||
ceph_mdsc_put_request(req);
|
||||
return err;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -819,7 +819,11 @@ static int ceph_set_super(struct super_block *s, void *data)
|
|||
|
||||
s->s_flags = fsc->mount_options->sb_flags;
|
||||
s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
|
||||
#ifdef CONFIG_CEPH_FS_POSIX_ACL
|
||||
s->s_flags |= MS_POSIXACL;
|
||||
#endif
|
||||
|
||||
s->s_xattr = ceph_xattr_handlers;
|
||||
s->s_fs_info = fsc;
|
||||
fsc->sb = s;
|
||||
|
||||
|
|
|
|||
|
|
@ -335,7 +335,6 @@ struct ceph_inode_info {
|
|||
u32 i_fscache_gen; /* sequence, for delayed fscache validate */
|
||||
struct work_struct i_revalidate_work;
|
||||
#endif
|
||||
|
||||
struct inode vfs_inode; /* at end */
|
||||
};
|
||||
|
||||
|
|
@ -725,6 +724,9 @@ extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|||
/* xattr.c */
|
||||
extern int ceph_setxattr(struct dentry *, const char *, const void *,
|
||||
size_t, int);
|
||||
int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
|
||||
ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
|
||||
int __ceph_removexattr(struct dentry *, const char *);
|
||||
extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
|
||||
extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
|
||||
extern int ceph_removexattr(struct dentry *, const char *);
|
||||
|
|
@ -733,6 +735,39 @@ extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
|
|||
extern void __init ceph_xattr_init(void);
|
||||
extern void ceph_xattr_exit(void);
|
||||
|
||||
/* acl.c */
|
||||
extern const struct xattr_handler ceph_xattr_acl_access_handler;
|
||||
extern const struct xattr_handler ceph_xattr_acl_default_handler;
|
||||
extern const struct xattr_handler *ceph_xattr_handlers[];
|
||||
|
||||
#ifdef CONFIG_CEPH_FS_POSIX_ACL
|
||||
|
||||
struct posix_acl *ceph_get_acl(struct inode *, int);
|
||||
int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
|
||||
int ceph_acl_chmod(struct dentry *, struct inode *);
|
||||
void ceph_forget_all_cached_acls(struct inode *inode);
|
||||
|
||||
#else
|
||||
|
||||
#define ceph_get_acl NULL
|
||||
|
||||
static inline int ceph_init_acl(struct dentry *dentry, struct inode *inode,
|
||||
struct inode *dir)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void ceph_forget_all_cached_acls(struct inode *inode)
|
||||
{
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/* caps.c */
|
||||
extern const char *ceph_cap_string(int c);
|
||||
extern void ceph_handle_caps(struct ceph_mds_session *session,
|
||||
|
|
|
|||
|
|
@ -11,11 +11,24 @@
|
|||
#define XATTR_CEPH_PREFIX "ceph."
|
||||
#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
|
||||
|
||||
/*
|
||||
* List of handlers for synthetic system.* attributes. Other
|
||||
* attributes are handled directly.
|
||||
*/
|
||||
const struct xattr_handler *ceph_xattr_handlers[] = {
|
||||
#ifdef CONFIG_CEPH_FS_POSIX_ACL
|
||||
&ceph_xattr_acl_access_handler,
|
||||
&ceph_xattr_acl_default_handler,
|
||||
#endif
|
||||
NULL,
|
||||
};
|
||||
|
||||
static bool ceph_is_valid_xattr(const char *name)
|
||||
{
|
||||
return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
|
||||
!strncmp(name, XATTR_SECURITY_PREFIX,
|
||||
XATTR_SECURITY_PREFIX_LEN) ||
|
||||
!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
|
||||
!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
|
||||
!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
|
||||
}
|
||||
|
|
@ -663,10 +676,9 @@ void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
|
|||
}
|
||||
}
|
||||
|
||||
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
|
||||
ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
|
||||
size_t size)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct ceph_inode_info *ci = ceph_inode(inode);
|
||||
int err;
|
||||
struct ceph_inode_xattr *xattr;
|
||||
|
|
@ -675,7 +687,6 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
|
|||
if (!ceph_is_valid_xattr(name))
|
||||
return -ENODATA;
|
||||
|
||||
|
||||
/* let's see if a virtual xattr was requested */
|
||||
vxattr = ceph_match_vxattr(inode, name);
|
||||
if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
|
||||
|
|
@ -725,6 +736,15 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
|
||||
size_t size)
|
||||
{
|
||||
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
|
||||
return generic_getxattr(dentry, name, value, size);
|
||||
|
||||
return __ceph_getxattr(dentry->d_inode, name, value, size);
|
||||
}
|
||||
|
||||
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
|
|
@ -863,8 +883,8 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
int ceph_setxattr(struct dentry *dentry, const char *name,
|
||||
const void *value, size_t size, int flags)
|
||||
int __ceph_setxattr(struct dentry *dentry, const char *name,
|
||||
const void *value, size_t size, int flags)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct ceph_vxattr *vxattr;
|
||||
|
|
@ -879,9 +899,6 @@ int ceph_setxattr(struct dentry *dentry, const char *name,
|
|||
struct ceph_inode_xattr *xattr = NULL;
|
||||
int required_blob_size;
|
||||
|
||||
if (ceph_snap(inode) != CEPH_NOSNAP)
|
||||
return -EROFS;
|
||||
|
||||
if (!ceph_is_valid_xattr(name))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
|
|
@ -958,6 +975,18 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
int ceph_setxattr(struct dentry *dentry, const char *name,
|
||||
const void *value, size_t size, int flags)
|
||||
{
|
||||
if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
|
||||
return -EROFS;
|
||||
|
||||
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
|
||||
return generic_setxattr(dentry, name, value, size, flags);
|
||||
|
||||
return __ceph_setxattr(dentry, name, value, size, flags);
|
||||
}
|
||||
|
||||
static int ceph_send_removexattr(struct dentry *dentry, const char *name)
|
||||
{
|
||||
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
|
||||
|
|
@ -984,7 +1013,7 @@ static int ceph_send_removexattr(struct dentry *dentry, const char *name)
|
|||
return err;
|
||||
}
|
||||
|
||||
int ceph_removexattr(struct dentry *dentry, const char *name)
|
||||
int __ceph_removexattr(struct dentry *dentry, const char *name)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct ceph_vxattr *vxattr;
|
||||
|
|
@ -994,9 +1023,6 @@ int ceph_removexattr(struct dentry *dentry, const char *name)
|
|||
int required_blob_size;
|
||||
int dirty;
|
||||
|
||||
if (ceph_snap(inode) != CEPH_NOSNAP)
|
||||
return -EROFS;
|
||||
|
||||
if (!ceph_is_valid_xattr(name))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
|
|
@ -1053,3 +1079,13 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
int ceph_removexattr(struct dentry *dentry, const char *name)
|
||||
{
|
||||
if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
|
||||
return -EROFS;
|
||||
|
||||
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
|
||||
return generic_removexattr(dentry, name);
|
||||
|
||||
return __ceph_removexattr(dentry, name);
|
||||
}
|
||||
|
|
|
|||
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