ocfs2: add POSIX ACL API

This patch adds POSIX ACL(access control lists) APIs in ocfs2. We convert
struct posix_acl to many ocfs2_acl_entry and regard them as an extended
attribute entry.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

6 files changed, 426 insertions, 0 deletions

diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index 589dcdfdfe3c..e9ef5d162db1 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -37,6 +37,10 @@ ocfs2-objs := \
         ver.o                   \
         xattr.o
 
+ifeq ($(CONFIG_OCFS2_FS_POSIX_ACL),y)
+ocfs2-objs += acl.o
+endif
+
 ocfs2_stackglue-objs := stackglue.o
 ocfs2_stack_o2cb-objs := stack_o2cb.o
 ocfs2_stack_user-objs := stack_user.o
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
new file mode 100644
index 000000000000..62d0faad600b
--- /dev/null
+++ b/fs/ocfs2/acl.c
@@ -0,0 +1,378 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * acl.c
+ *
+ * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
+ *
+ * CREDITS:
+ * Lots of code in this file is copy from linux/fs/ext3/acl.c.
+ * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#define MLOG_MASK_PREFIX ML_INODE
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+#include "alloc.h"
+#include "dlmglue.h"
+#include "file.h"
+#include "ocfs2_fs.h"
+
+#include "xattr.h"
+#include "acl.h"
+
+/*
+ * Convert from xattr value to acl struct.
+ */
+static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
+{
+        int n, count;
+        struct posix_acl *acl;
+
+        if (!value)
+                return NULL;
+        if (size < sizeof(struct posix_acl_entry))
+                return ERR_PTR(-EINVAL);
+
+        count = size / sizeof(struct posix_acl_entry);
+        if (count < 0)
+                return ERR_PTR(-EINVAL);
+        if (count == 0)
+                return NULL;
+
+        acl = posix_acl_alloc(count, GFP_NOFS);
+        if (!acl)
+                return ERR_PTR(-ENOMEM);
+        for (n = 0; n < count; n++) {
+                struct ocfs2_acl_entry *entry =
+                        (struct ocfs2_acl_entry *)value;
+
+                acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
+                acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
+                acl->a_entries[n].e_id   = le32_to_cpu(entry->e_id);
+                value += sizeof(struct posix_acl_entry);
+
+        }
+        return acl;
+}
+
+/*
+ * Convert acl struct to xattr value.
+ */
+static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
+{
+        struct ocfs2_acl_entry *entry = NULL;
+        char *ocfs2_acl;
+        size_t n;
+
+        *size = acl->a_count * sizeof(struct posix_acl_entry);
+
+        ocfs2_acl = kmalloc(*size, GFP_NOFS);
+        if (!ocfs2_acl)
+                return ERR_PTR(-ENOMEM);
+
+        entry = (struct ocfs2_acl_entry *)ocfs2_acl;
+        for (n = 0; n < acl->a_count; n++, entry++) {
+                entry->e_tag  = cpu_to_le16(acl->a_entries[n].e_tag);
+                entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
+                entry->e_id   = cpu_to_le32(acl->a_entries[n].e_id);
+        }
+        return ocfs2_acl;
+}
+
+static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
+                                              int type,
+                                              struct buffer_head *di_bh)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        int name_index;
+        char *value = NULL;
+        struct posix_acl *acl;
+        int retval;
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return NULL;
+
+        switch (type) {
+        case ACL_TYPE_ACCESS:
+                name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
+                break;
+        case ACL_TYPE_DEFAULT:
+                name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+                break;
+        default:
+                return ERR_PTR(-EINVAL);
+        }
+
+        retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
+        if (retval > 0) {
+                value = kmalloc(retval, GFP_NOFS);
+                if (!value)
+                        return ERR_PTR(-ENOMEM);
+                retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
+                                                "", value, retval);
+        }
+
+        if (retval > 0)
+                acl = ocfs2_acl_from_xattr(value, retval);
+        else if (retval == -ENODATA || retval == 0)
+                acl = NULL;
+        else
+                acl = ERR_PTR(retval);
+
+        kfree(value);
+
+        return acl;
+}
+
+
+/*
+ * Get posix acl.
+ */
+static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct buffer_head *di_bh = NULL;
+        struct posix_acl *acl;
+        int ret;
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return NULL;
+
+        ret = ocfs2_inode_lock(inode, &di_bh, 0);
+        if (ret < 0) {
+                mlog_errno(ret);
+                acl = ERR_PTR(ret);
+                return acl;
+        }
+
+        acl = ocfs2_get_acl_nolock(inode, type, di_bh);
+
+        ocfs2_inode_unlock(inode, 0);
+
+        brelse(di_bh);
+
+        return acl;
+}
+
+/*
+ * Set the access or default ACL of an inode.
+ */
+static int ocfs2_set_acl(handle_t *handle,
+                         struct inode *inode,
+                         struct buffer_head *di_bh,
+                         int type,
+                         struct posix_acl *acl,
+                         struct ocfs2_alloc_context *meta_ac,
+                         struct ocfs2_alloc_context *data_ac)
+{
+        int name_index;
+        void *value = NULL;
+        size_t size = 0;
+        int ret;
+
+        if (S_ISLNK(inode->i_mode))
+                return -EOPNOTSUPP;
+
+        switch (type) {
+        case ACL_TYPE_ACCESS:
+                name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
+                if (acl) {
+                        mode_t mode = inode->i_mode;
+                        ret = posix_acl_equiv_mode(acl, &mode);
+                        if (ret < 0)
+                                return ret;
+                        else {
+                                inode->i_mode = mode;
+                                if (ret == 0)
+                                        acl = NULL;
+                        }
+                }
+                break;
+        case ACL_TYPE_DEFAULT:
+                name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+                if (!S_ISDIR(inode->i_mode))
+                        return acl ? -EACCES : 0;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (acl) {
+                value = ocfs2_acl_to_xattr(acl, &size);
+                if (IS_ERR(value))
+                        return (int)PTR_ERR(value);
+        }
+
+        if (handle)
+                ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
+                                             "", value, size, 0,
+                                             meta_ac, data_ac);
+        else
+                ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
+
+        kfree(value);
+
+        return ret;
+}
+
+static size_t ocfs2_xattr_list_acl_access(struct inode *inode,
+                                          char *list,
+                                          size_t list_len,
+                                          const char *name,
+                                          size_t name_len)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return 0;
+
+        if (list && size <= list_len)
+                memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
+        return size;
+}
+
+static size_t ocfs2_xattr_list_acl_default(struct inode *inode,
+                                           char *list,
+                                           size_t list_len,
+                                           const char *name,
+                                           size_t name_len)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return 0;
+
+        if (list && size <= list_len)
+                memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
+        return size;
+}
+
+static int ocfs2_xattr_get_acl(struct inode *inode,
+                               int type,
+                               void *buffer,
+                               size_t size)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct posix_acl *acl;
+        int ret;
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return -EOPNOTSUPP;
+
+        acl = ocfs2_get_acl(inode, type);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (acl == NULL)
+                return -ENODATA;
+        ret = posix_acl_to_xattr(acl, buffer, size);
+        posix_acl_release(acl);
+
+        return ret;
+}
+
+static int ocfs2_xattr_get_acl_access(struct inode *inode,
+                                      const char *name,
+                                      void *buffer,
+                                      size_t size)
+{
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+        return ocfs2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
+}
+
+static int ocfs2_xattr_get_acl_default(struct inode *inode,
+                                       const char *name,
+                                       void *buffer,
+                                       size_t size)
+{
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+        return ocfs2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
+}
+
+static int ocfs2_xattr_set_acl(struct inode *inode,
+                               int type,
+                               const void *value,
+                               size_t size)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct posix_acl *acl;
+        int ret = 0;
+
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+                return -EOPNOTSUPP;
+
+        if (!is_owner_or_cap(inode))
+                return -EPERM;
+
+        if (value) {
+                acl = posix_acl_from_xattr(value, size);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+                else if (acl) {
+                        ret = posix_acl_valid(acl);
+                        if (ret)
+                                goto cleanup;
+                }
+        } else
+                acl = NULL;
+
+        ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
+
+cleanup:
+        posix_acl_release(acl);
+        return ret;
+}
+
+static int ocfs2_xattr_set_acl_access(struct inode *inode,
+                                      const char *name,
+                                      const void *value,
+                                      size_t size,
+                                      int flags)
+{
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+        return ocfs2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
+}
+
+static int ocfs2_xattr_set_acl_default(struct inode *inode,
+                                       const char *name,
+                                       const void *value,
+                                       size_t size,
+                                       int flags)
+{
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+        return ocfs2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
+}
+
+struct xattr_handler ocfs2_xattr_acl_access_handler = {
+        .prefix = POSIX_ACL_XATTR_ACCESS,
+        .list   = ocfs2_xattr_list_acl_access,
+        .get    = ocfs2_xattr_get_acl_access,
+        .set    = ocfs2_xattr_set_acl_access,
+};
+
+struct xattr_handler ocfs2_xattr_acl_default_handler = {
+        .prefix = POSIX_ACL_XATTR_DEFAULT,
+        .list   = ocfs2_xattr_list_acl_default,
+        .get    = ocfs2_xattr_get_acl_default,
+        .set    = ocfs2_xattr_set_acl_default,
+};
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h
new file mode 100644
index 000000000000..1b39f3e14c1b
--- /dev/null
+++ b/fs/ocfs2/acl.h
@@ -0,0 +1,29 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * acl.h
+ *
+ * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 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.
+ */
+
+#ifndef OCFS2_ACL_H
+#define OCFS2_ACL_H
+
+#include <linux/posix_acl_xattr.h>
+
+struct ocfs2_acl_entry {
+        __le16 e_tag;
+        __le16 e_perm;
+        __le32 e_id;
+};
+
+#endif /* OCFS2_ACL_H */
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 3fed9e3d8992..25d07ff1d3cd 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -195,6 +195,7 @@ enum ocfs2_mount_options
         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
         OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
         OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
+        OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* POSIX access control lists */
 };
 
 #define OCFS2_OSB_SOFT_RO       0x0001
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index ba9b870a5dda..2e273c2cb831 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -91,6 +91,10 @@ static struct ocfs2_xattr_def_value_root def_xv = {
 
 struct xattr_handler *ocfs2_xattr_handlers[] = {
         &ocfs2_xattr_user_handler,
+#ifdef CONFIG_OCFS2_FS_POSIX_ACL
+        &ocfs2_xattr_acl_access_handler,
+        &ocfs2_xattr_acl_default_handler,
+#endif
         &ocfs2_xattr_trusted_handler,
         &ocfs2_xattr_security_handler,
         NULL
@@ -98,6 +102,12 @@ struct xattr_handler *ocfs2_xattr_handlers[] = {
 
 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
+#ifdef CONFIG_OCFS2_FS_POSIX_ACL
+        [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
+                                        = &ocfs2_xattr_acl_access_handler,
+        [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
+                                        = &ocfs2_xattr_acl_default_handler,
+#endif
         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 };
diff --git a/fs/ocfs2/xattr.h b/fs/ocfs2/xattr.h
index 86aa10ffe3f3..6163df336d8c 100644
--- a/fs/ocfs2/xattr.h
+++ b/fs/ocfs2/xattr.h
@@ -40,6 +40,10 @@ struct ocfs2_security_xattr_info {
 extern struct xattr_handler ocfs2_xattr_user_handler;
 extern struct xattr_handler ocfs2_xattr_trusted_handler;
 extern struct xattr_handler ocfs2_xattr_security_handler;
+#ifdef CONFIG_OCFS2_FS_POSIX_ACL
+extern struct xattr_handler ocfs2_xattr_acl_access_handler;
+extern struct xattr_handler ocfs2_xattr_acl_default_handler;
+#endif
 extern struct xattr_handler *ocfs2_xattr_handlers[];
 
 ssize_t ocfs2_listxattr(struct dentry *, char *, size_t);