1 files changed, 241 insertions, 0 deletions

diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
new file mode 100644
index 000000000000..87d3e03878c8
--- /dev/null
+++ b/fs/xfs/xfs_xattr.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2008 Christoph Hellwig.
+ * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it would 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 the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "xfs.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_attr.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_acl.h"
+#include "xfs_vnodeops.h"
+
+#include <linux/posix_acl_xattr.h>
+#include <linux/xattr.h>
+
+
+static int
+xfs_xattr_get(struct dentry *dentry, const char *name,
+                void *value, size_t size, int xflags)
+{
+        struct xfs_inode *ip = XFS_I(dentry->d_inode);
+        int error, asize = size;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        /* Convert Linux syscall to XFS internal ATTR flags */
+        if (!size) {
+                xflags |= ATTR_KERNOVAL;
+                value = NULL;
+        }
+
+        error = -xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
+        if (error)
+                return error;
+        return asize;
+}
+
+static int
+xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
+                size_t size, int flags, int xflags)
+{
+        struct xfs_inode *ip = XFS_I(dentry->d_inode);
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        /* Convert Linux syscall to XFS internal ATTR flags */
+        if (flags & XATTR_CREATE)
+                xflags |= ATTR_CREATE;
+        if (flags & XATTR_REPLACE)
+                xflags |= ATTR_REPLACE;
+
+        if (!value)
+                return -xfs_attr_remove(ip, (unsigned char *)name, xflags);
+        return -xfs_attr_set(ip, (unsigned char *)name,
+                                (void *)value, size, xflags);
+}
+
+static const struct xattr_handler xfs_xattr_user_handler = {
+        .prefix = XATTR_USER_PREFIX,
+        .flags  = 0, /* no flags implies user namespace */
+        .get    = xfs_xattr_get,
+        .set    = xfs_xattr_set,
+};
+
+static const struct xattr_handler xfs_xattr_trusted_handler = {
+        .prefix = XATTR_TRUSTED_PREFIX,
+        .flags  = ATTR_ROOT,
+        .get    = xfs_xattr_get,
+        .set    = xfs_xattr_set,
+};
+
+static const struct xattr_handler xfs_xattr_security_handler = {
+        .prefix = XATTR_SECURITY_PREFIX,
+        .flags  = ATTR_SECURE,
+        .get    = xfs_xattr_get,
+        .set    = xfs_xattr_set,
+};
+
+const struct xattr_handler *xfs_xattr_handlers[] = {
+        &xfs_xattr_user_handler,
+        &xfs_xattr_trusted_handler,
+        &xfs_xattr_security_handler,
+#ifdef CONFIG_XFS_POSIX_ACL
+        &xfs_xattr_acl_access_handler,
+        &xfs_xattr_acl_default_handler,
+#endif
+        NULL
+};
+
+static unsigned int xfs_xattr_prefix_len(int flags)
+{
+        if (flags & XFS_ATTR_SECURE)
+                return sizeof("security");
+        else if (flags & XFS_ATTR_ROOT)
+                return sizeof("trusted");
+        else
+                return sizeof("user");
+}
+
+static const char *xfs_xattr_prefix(int flags)
+{
+        if (flags & XFS_ATTR_SECURE)
+                return xfs_xattr_security_handler.prefix;
+        else if (flags & XFS_ATTR_ROOT)
+                return xfs_xattr_trusted_handler.prefix;
+        else
+                return xfs_xattr_user_handler.prefix;
+}
+
+static int
+xfs_xattr_put_listent(
+        struct xfs_attr_list_context *context,
+        int             flags,
+        unsigned char   *name,
+        int             namelen,
+        int             valuelen,
+        unsigned char   *value)
+{
+        unsigned int prefix_len = xfs_xattr_prefix_len(flags);
+        char *offset;
+        int arraytop;
+
+        ASSERT(context->count >= 0);
+
+        /*
+         * Only show root namespace entries if we are actually allowed to
+         * see them.
+         */
+        if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
+                return 0;
+
+        arraytop = context->count + prefix_len + namelen + 1;
+        if (arraytop > context->firstu) {
+                context->count = -1;    /* insufficient space */
+                return 1;
+        }
+        offset = (char *)context->alist + context->count;
+        strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
+        offset += prefix_len;
+        strncpy(offset, (char *)name, namelen);                 /* real name */
+        offset += namelen;
+        *offset = '\0';
+        context->count += prefix_len + namelen + 1;
+        return 0;
+}
+
+static int
+xfs_xattr_put_listent_sizes(
+        struct xfs_attr_list_context *context,
+        int             flags,
+        unsigned char   *name,
+        int             namelen,
+        int             valuelen,
+        unsigned char   *value)
+{
+        context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
+        return 0;
+}
+
+static int
+list_one_attr(const char *name, const size_t len, void *data,
+                size_t size, ssize_t *result)
+{
+        char *p = data + *result;
+
+        *result += len;
+        if (!size)
+                return 0;
+        if (*result > size)
+                return -ERANGE;
+
+        strcpy(p, name);
+        return 0;
+}
+
+ssize_t
+xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
+{
+        struct xfs_attr_list_context context;
+        struct attrlist_cursor_kern cursor = { 0 };
+        struct inode            *inode = dentry->d_inode;
+        int                     error;
+
+        /*
+         * First read the regular on-disk attributes.
+         */
+        memset(&context, 0, sizeof(context));
+        context.dp = XFS_I(inode);
+        context.cursor = &cursor;
+        context.resynch = 1;
+        context.alist = data;
+        context.bufsize = size;
+        context.firstu = context.bufsize;
+
+        if (size)
+                context.put_listent = xfs_xattr_put_listent;
+        else
+                context.put_listent = xfs_xattr_put_listent_sizes;
+
+        xfs_attr_list_int(&context);
+        if (context.count < 0)
+                return -ERANGE;
+
+        /*
+         * Then add the two synthetic ACL attributes.
+         */
+        if (posix_acl_access_exists(inode)) {
+                error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
+                                strlen(POSIX_ACL_XATTR_ACCESS) + 1,
+                                data, size, &context.count);
+                if (error)
+                        return error;
+        }
+
+        if (posix_acl_default_exists(inode)) {
+                error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
+                                strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
+                                data, size, &context.count);
+                if (error)
+                        return error;
+        }
+
+        return context.count;
+}