1 files changed, 230 insertions, 0 deletions

diff --git a/fs/gfs2/eaops.c b/fs/gfs2/eaops.c
new file mode 100644
index 000000000000..92c54e9b0dc3
--- /dev/null
+++ b/fs/gfs2/eaops.c
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/xattr.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/lm_interface.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "eaops.h"
+#include "eattr.h"
+#include "util.h"
+
+/**
+ * gfs2_ea_name2type - get the type of the ea, and truncate type from the name
+ * @namep: ea name, possibly with type appended
+ *
+ * Returns: GFS2_EATYPE_XXX
+ */
+
+unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
+{
+        unsigned int type;
+
+        if (strncmp(name, "system.", 7) == 0) {
+                type = GFS2_EATYPE_SYS;
+                if (truncated_name)
+                        *truncated_name = name + sizeof("system.") - 1;
+        } else if (strncmp(name, "user.", 5) == 0) {
+                type = GFS2_EATYPE_USR;
+                if (truncated_name)
+                        *truncated_name = name + sizeof("user.") - 1;
+        } else if (strncmp(name, "security.", 9) == 0) {
+                type = GFS2_EATYPE_SECURITY;
+                if (truncated_name)
+                        *truncated_name = name + sizeof("security.") - 1;
+        } else {
+                type = GFS2_EATYPE_UNUSED;
+                if (truncated_name)
+                        *truncated_name = NULL;
+        }
+
+        return type;
+}
+
+static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+        int error = permission(inode, MAY_READ, NULL);
+        if (error)
+                return error;
+
+        return gfs2_ea_get_i(ip, er);
+}
+
+static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+
+        if (S_ISREG(inode->i_mode) ||
+            (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
+                int error = permission(inode, MAY_WRITE, NULL);
+                if (error)
+                        return error;
+        } else
+                return -EPERM;
+
+        return gfs2_ea_set_i(ip, er);
+}
+
+static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+
+        if (S_ISREG(inode->i_mode) ||
+            (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
+                int error = permission(inode, MAY_WRITE, NULL);
+                if (error)
+                        return error;
+        } else
+                return -EPERM;
+
+        return gfs2_ea_remove_i(ip, er);
+}
+
+static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
+            !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
+            !capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
+            (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
+             GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
+                return -EOPNOTSUPP;
+
+
+
+        return gfs2_ea_get_i(ip, er);
+}
+
+static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        int remove = 0;
+        int error;
+
+        if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
+                if (!(er->er_flags & GFS2_ERF_MODE)) {
+                        er->er_mode = ip->i_di.di_mode;
+                        er->er_flags |= GFS2_ERF_MODE;
+                }
+                error = gfs2_acl_validate_set(ip, 1, er,
+                                              &remove, &er->er_mode);
+                if (error)
+                        return error;
+                error = gfs2_ea_set_i(ip, er);
+                if (error)
+                        return error;
+                if (remove)
+                        gfs2_ea_remove_i(ip, er);
+                return 0;
+
+        } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
+                error = gfs2_acl_validate_set(ip, 0, er,
+                                              &remove, NULL);
+                if (error)
+                        return error;
+                if (!remove)
+                        error = gfs2_ea_set_i(ip, er);
+                else {
+                        error = gfs2_ea_remove_i(ip, er);
+                        if (error == -ENODATA)
+                                error = 0;
+                }
+                return error;
+        }
+
+        return -EPERM;
+}
+
+static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
+                int error = gfs2_acl_validate_remove(ip, 1);
+                if (error)
+                        return error;
+
+        } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
+                int error = gfs2_acl_validate_remove(ip, 0);
+                if (error)
+                        return error;
+
+        } else
+                return -EPERM;
+
+        return gfs2_ea_remove_i(ip, er);
+}
+
+static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+        int error = permission(inode, MAY_READ, NULL);
+        if (error)
+                return error;
+
+        return gfs2_ea_get_i(ip, er);
+}
+
+static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+        int error = permission(inode, MAY_WRITE, NULL);
+        if (error)
+                return error;
+
+        return gfs2_ea_set_i(ip, er);
+}
+
+static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
+{
+        struct inode *inode = &ip->i_inode;
+        int error = permission(inode, MAY_WRITE, NULL);
+        if (error)
+                return error;
+
+        return gfs2_ea_remove_i(ip, er);
+}
+
+static struct gfs2_eattr_operations gfs2_user_eaops = {
+        .eo_get = user_eo_get,
+        .eo_set = user_eo_set,
+        .eo_remove = user_eo_remove,
+        .eo_name = "user",
+};
+
+struct gfs2_eattr_operations gfs2_system_eaops = {
+        .eo_get = system_eo_get,
+        .eo_set = system_eo_set,
+        .eo_remove = system_eo_remove,
+        .eo_name = "system",
+};
+
+static struct gfs2_eattr_operations gfs2_security_eaops = {
+        .eo_get = security_eo_get,
+        .eo_set = security_eo_set,
+        .eo_remove = security_eo_remove,
+        .eo_name = "security",
+};
+
+struct gfs2_eattr_operations *gfs2_ea_ops[] = {
+        NULL,
+        &gfs2_user_eaops,
+        &gfs2_system_eaops,
+        &gfs2_security_eaops,
+};
+