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-rw-r--r--fs/ceph/acl.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
new file mode 100644
index 000000000000..64fddbc1d17b
--- /dev/null
+++ b/fs/ceph/acl.c
@@ -0,0 +1,332 @@
+/*
+ * linux/fs/ceph/acl.c
+ *
+ * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/ceph/ceph_debug.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "super.h"
+
+static inline void ceph_set_cached_acl(struct inode *inode,
+ int type, struct posix_acl *acl)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ spin_lock(&ci->i_ceph_lock);
+ if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
+ set_cached_acl(inode, type, acl);
+ spin_unlock(&ci->i_ceph_lock);
+}
+
+static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode,
+ int type)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct posix_acl *acl = ACL_NOT_CACHED;
+
+ spin_lock(&ci->i_ceph_lock);
+ if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
+ acl = get_cached_acl(inode, type);
+ spin_unlock(&ci->i_ceph_lock);
+
+ return acl;
+}
+
+void ceph_forget_all_cached_acls(struct inode *inode)
+{
+ forget_all_cached_acls(inode);
+}
+
+struct posix_acl *ceph_get_acl(struct inode *inode, int type)
+{
+ int size;
+ const char *name;
+ char *value = NULL;
+ struct posix_acl *acl;
+
+ if (!IS_POSIXACL(inode))
+ return NULL;
+
+ acl = ceph_get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name = POSIX_ACL_XATTR_ACCESS;
+ break;
+ case ACL_TYPE_DEFAULT:
+ name = POSIX_ACL_XATTR_DEFAULT;
+ break;
+ default:
+ BUG();
+ }
+
+ size = __ceph_getxattr(inode, name, "", 0);
+ if (size > 0) {
+ value = kzalloc(size, GFP_NOFS);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ size = __ceph_getxattr(inode, name, value, size);
+ }
+
+ if (size > 0)
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
+ else if (size == -ERANGE || size == -ENODATA || size == 0)
+ acl = NULL;
+ else
+ acl = ERR_PTR(-EIO);
+
+ kfree(value);
+
+ if (!IS_ERR(acl))
+ ceph_set_cached_acl(inode, type, acl);
+
+ return acl;
+}
+
+static int ceph_set_acl(struct dentry *dentry, struct inode *inode,
+ struct posix_acl *acl, int type)
+{
+ int ret = 0, size = 0;
+ const char *name = NULL;
+ char *value = NULL;
+ struct iattr newattrs;
+ umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
+
+ if (acl) {
+ ret = posix_acl_valid(acl);
+ if (ret < 0)
+ goto out;
+ }
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name = POSIX_ACL_XATTR_ACCESS;
+ if (acl) {
+ ret = posix_acl_equiv_mode(acl, &new_mode);
+ if (ret < 0)
+ goto out;
+ if (ret == 0)
+ acl = NULL;
+ }
+ break;
+ case ACL_TYPE_DEFAULT:
+ if (!S_ISDIR(inode->i_mode)) {
+ ret = acl ? -EINVAL : 0;
+ goto out;
+ }
+ name = POSIX_ACL_XATTR_DEFAULT;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (acl) {
+ size = posix_acl_xattr_size(acl->a_count);
+ value = kmalloc(size, GFP_NOFS);
+ if (!value) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+ if (ret < 0)
+ goto out_free;
+ }
+
+ if (new_mode != old_mode) {
+ newattrs.ia_mode = new_mode;
+ newattrs.ia_valid = ATTR_MODE;
+ ret = ceph_setattr(dentry, &newattrs);
+ if (ret)
+ goto out_free;
+ }
+
+ if (value)
+ ret = __ceph_setxattr(dentry, name, value, size, 0);
+ else
+ ret = __ceph_removexattr(dentry, name);
+
+ if (ret) {
+ if (new_mode != old_mode) {
+ newattrs.ia_mode = old_mode;
+ newattrs.ia_valid = ATTR_MODE;
+ ceph_setattr(dentry, &newattrs);
+ }
+ goto out_free;
+ }
+
+ ceph_set_cached_acl(inode, type, acl);
+
+out_free:
+ kfree(value);
+out:
+ return ret;
+}
+
+int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
+{
+ struct posix_acl *acl = NULL;
+ int ret = 0;
+
+ if (!S_ISLNK(inode->i_mode)) {
+ if (IS_POSIXACL(dir)) {
+ acl = ceph_get_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl)) {
+ ret = PTR_ERR(acl);
+ goto out;
+ }
+ }
+
+ if (!acl)
+ inode->i_mode &= ~current_umask();
+ }
+
+ if (IS_POSIXACL(dir) && acl) {
+ if (S_ISDIR(inode->i_mode)) {
+ ret = ceph_set_acl(dentry, inode, acl,
+ ACL_TYPE_DEFAULT);
+ if (ret)
+ goto out_release;
+ }
+ ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+ if (ret < 0)
+ goto out;
+ else if (ret > 0)
+ ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
+ else
+ cache_no_acl(inode);
+ } else {
+ cache_no_acl(inode);
+ }
+
+out_release:
+ posix_acl_release(acl);
+out:
+ return ret;
+}
+
+int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
+{
+ struct posix_acl *acl;
+ int ret = 0;
+
+ if (S_ISLNK(inode->i_mode)) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!IS_POSIXACL(inode))
+ goto out;
+
+ acl = ceph_get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR_OR_NULL(acl)) {
+ ret = PTR_ERR(acl);
+ goto out;
+ }
+
+ ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+ if (ret)
+ goto out;
+ ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
+ posix_acl_release(acl);
+out:
+ return ret;
+}
+
+static int ceph_xattr_acl_get(struct dentry *dentry, const char *name,
+ void *value, size_t size, int type)
+{
+ struct posix_acl *acl;
+ int ret = 0;
+
+ if (!IS_POSIXACL(dentry->d_inode))
+ return -EOPNOTSUPP;
+
+ acl = ceph_get_acl(dentry->d_inode, type);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+
+ ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+ posix_acl_release(acl);
+
+ return ret;
+}
+
+static int ceph_xattr_acl_set(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags, int type)
+{
+ int ret = 0;
+ struct posix_acl *acl = NULL;
+
+ if (!inode_owner_or_capable(dentry->d_inode)) {
+ ret = -EPERM;
+ goto out;
+ }
+
+ if (!IS_POSIXACL(dentry->d_inode)) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (value) {
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
+ if (IS_ERR(acl)) {
+ ret = PTR_ERR(acl);
+ goto out;
+ }
+
+ if (acl) {
+ ret = posix_acl_valid(acl);
+ if (ret)
+ goto out_release;
+ }
+ }
+
+ ret = ceph_set_acl(dentry, dentry->d_inode, acl, type);
+
+out_release:
+ posix_acl_release(acl);
+out:
+ return ret;
+}
+
+const struct xattr_handler ceph_xattr_acl_default_handler = {
+ .prefix = POSIX_ACL_XATTR_DEFAULT,
+ .flags = ACL_TYPE_DEFAULT,
+ .get = ceph_xattr_acl_get,
+ .set = ceph_xattr_acl_set,
+};
+
+const struct xattr_handler ceph_xattr_acl_access_handler = {
+ .prefix = POSIX_ACL_XATTR_ACCESS,
+ .flags = ACL_TYPE_ACCESS,
+ .get = ceph_xattr_acl_get,
+ .set = ceph_xattr_acl_set,
+};