From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [RFC][PATCH 14/15] nilfs2: implement POSIX ACLs support
This patch adds functionality of POSIX ACLs support.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/acl.c | 319 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/acl.h | 58 ++++++++++
2 files changed, 377 insertions(+)
create mode 100644 fs/nilfs2/acl.c
create mode 100644 fs/nilfs2/acl.h
diff --git a/fs/nilfs2/acl.c b/fs/nilfs2/acl.c
new file mode 100644
index 0000000..95b3601
--- /dev/null
+++ b/fs/nilfs2/acl.c
@@ -0,0 +1,319 @@
+/*
+ * acl.c - NILFS ACLs support implementation.
+ *
+ * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2013 Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ */
+
+#include "nilfs.h"
+#include "xafile.h"
+#include "xattr.h"
+#include "acl.h"
+
+struct posix_acl *nilfs_get_acl(struct inode *inode, int type)
+{
+ struct posix_acl *acl;
+ char *xattr_name;
+ int name_index;
+ char *value = NULL;
+ ssize_t size;
+
+ acl = get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ xattr_name = POSIX_ACL_XATTR_ACCESS;
+ name_index = NILFS_POSIX_ACL_ACCESS_XATTR_ID;
+ break;
+ case ACL_TYPE_DEFAULT:
+ xattr_name = POSIX_ACL_XATTR_DEFAULT;
+ name_index = NILFS_POSIX_ACL_DEFAULT_XATTR_ID;
+ break;
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+
+ size = __nilfs_getxattr(inode, name_index, xattr_name, NULL, 0);
+
+ if (size > 0) {
+ value = kmalloc(size, GFP_KERNEL);
+ if (unlikely(!value))
+ return ERR_PTR(-ENOMEM);
+ size = __nilfs_getxattr(inode, name_index, xattr_name,
+ value, size);
+ }
+
+ if (size > 0)
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
+ else if (size == -ENODATA)
+ acl = NULL;
+ else
+ acl = ERR_PTR(size);
+
+ kfree(value);
+
+ if (!IS_ERR(acl))
+ set_cached_acl(inode, type, acl);
+
+ return acl;
+}
+
+static int nilfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ int err;
+ int name_index;
+ char *xattr_name;
+ size_t size = 0;
+ char *value = NULL;
+ struct nilfs_transaction_info ti;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name_index = NILFS_POSIX_ACL_ACCESS_XATTR_ID;
+ xattr_name = POSIX_ACL_XATTR_ACCESS;
+ if (acl) {
+ err = posix_acl_equiv_mode(acl, &inode->i_mode);
+ if (err < 0)
+ return err;
+ }
+ err = 0;
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ name_index = NILFS_POSIX_ACL_DEFAULT_XATTR_ID;
+ xattr_name = POSIX_ACL_XATTR_DEFAULT;
+ if (!S_ISDIR(inode->i_mode))
+ return acl ? -EACCES : 0;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (acl) {
+ size = posix_acl_xattr_size(acl->a_count);
+ value = kmalloc(size, GFP_KERNEL);
+ if (!value)
+ return -ENOMEM;
+ err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+ if (err < 0)
+ goto end_set_acl;
+ }
+
+ err = nilfs_transaction_begin(inode->i_sb, &ti, 0);
+ if (unlikely(err))
+ goto end_set_acl;
+
+ err = __nilfs_setxattr(inode, name_index, xattr_name, value, size, 0);
+
+ if (!err)
+ err = nilfs_transaction_commit(inode->i_sb);
+ else
+ nilfs_transaction_abort(inode->i_sb);
+
+end_set_acl:
+ kfree(value);
+
+ if (!err)
+ set_cached_acl(inode, type, acl);
+
+ return err;
+}
+
+int nilfs_init_acl(struct inode *inode, struct inode *dir)
+{
+ int err = 0;
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct posix_acl *acl = NULL;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (S_ISLNK(inode->i_mode))
+ return 0;
+
+ acl = nilfs_get_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+
+ if (acl) {
+ if (S_ISDIR(inode->i_mode)) {
+ err = nilfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
+ if (unlikely(err))
+ goto init_acl_cleanup;
+ }
+
+ err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+ if (unlikely(err < 0))
+ return err;
+
+ if (err > 0)
+ err = nilfs_set_acl(inode, ACL_TYPE_ACCESS, acl);
+ } else
+ inode->i_mode &= ~current_umask();
+
+init_acl_cleanup:
+ posix_acl_release(acl);
+ return err;
+}
+
+int nilfs_acl_chmod(struct inode *inode)
+{
+ int err;
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct posix_acl *acl;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ acl = nilfs_get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR(acl) || !acl)
+ return PTR_ERR(acl);
+ err = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+ if (unlikely(err))
+ return err;
+ err = nilfs_set_acl(inode, ACL_TYPE_ACCESS, acl);
+ posix_acl_release(acl);
+ return err;
+}
+
+static size_t nilfs_acl_access_listxattr(struct dentry *dentry,
+ char *list,
+ size_t list_len,
+ const char *name,
+ size_t name_len,
+ int type)
+{
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (list && size <= list_len)
+ memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
+ return size;
+}
+
+static size_t nilfs_acl_default_listxattr(struct dentry *dentry,
+ char *list,
+ size_t list_len,
+ const char *name,
+ size_t name_len,
+ int type)
+{
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (list && size <= list_len)
+ memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
+ return size;
+}
+
+static int nilfs_acl_getxattr(struct dentry *dentry,
+ const char *name,
+ void *buffer,
+ size_t size,
+ int type)
+{
+ int err = 0;
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ struct posix_acl *acl;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+
+ acl = nilfs_get_acl(dentry->d_inode, type);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+
+ err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
+ posix_acl_release(acl);
+ return err;
+}
+
+static int nilfs_acl_setxattr(struct dentry *dentry,
+ const char *name,
+ const void *value,
+ size_t size,
+ int flags,
+ int type)
+{
+ int err = 0;
+ struct inode *inode = dentry->d_inode;
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct posix_acl *acl = NULL;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
+ if (value) {
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ else if (acl) {
+ err = posix_acl_valid(acl);
+ if (err)
+ goto end_acl_setxattr;
+ }
+ }
+
+ err = nilfs_set_acl(inode, type, acl);
+
+end_acl_setxattr:
+ posix_acl_release(acl);
+ return err;
+}
+
+const struct xattr_handler nilfs_xattr_acl_access_handler = {
+ .prefix = POSIX_ACL_XATTR_ACCESS,
+ .flags = ACL_TYPE_ACCESS,
+ .list = nilfs_acl_access_listxattr,
+ .get = nilfs_acl_getxattr,
+ .set = nilfs_acl_setxattr,
+};
+
+const struct xattr_handler nilfs_xattr_acl_default_handler = {
+ .prefix = POSIX_ACL_XATTR_DEFAULT,
+ .flags = ACL_TYPE_DEFAULT,
+ .list = nilfs_acl_default_listxattr,
+ .get = nilfs_acl_getxattr,
+ .set = nilfs_acl_setxattr,
+};
diff --git a/fs/nilfs2/acl.h b/fs/nilfs2/acl.h
new file mode 100644
index 0000000..d537727
--- /dev/null
+++ b/fs/nilfs2/acl.h
@@ -0,0 +1,58 @@
+/*
+ * acl.h - NILFS ACLs support declarations.
+ *
+ * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2013 Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ */
+
+#ifndef _NILFS_ACL_H
+#define _NILFS_ACL_H
+
+#include <linux/posix_acl_xattr.h>
+
+#ifdef CONFIG_NILFS2_FS_POSIX_ACL
+
+#define set_posix_acl_flag(sb) \
+ ((sb)->s_flags |= MS_POSIXACL)
+
+/* acl.c */
+struct posix_acl *nilfs_get_acl(struct inode *inode, int type);
+extern int nilfs_acl_chmod(struct inode *inode);
+extern int nilfs_init_acl(struct inode *inode, struct inode *dir);
+
+#else /* CONFIG_NILFS2_FS_POSIX_ACL */
+
+#define set_posix_acl_flag(sb) \
+ ((sb)->s_flags &= ~MS_POSIXACL)
+
+#define nilfs_get_acl NULL
+
+static inline int nilfs_acl_chmod(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
+{
+ return 0;
+}
+
+#endif /* CONFIG_NILFS2_FS_POSIX_ACL */
+
+#endif /* _NILFS_ACL_H */
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
