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ext4: support xattr gnu.* namespace for the Hurd
The Hurd gained[0] support for moving the translator and author fields out of the inode and into the "gnu.*" xattr namespace. In anticipation of that, an xattr INDEX was reserved[1]. The Hurd has now been brought into compliance[2] with that. This patch adds support for reading and writing such attributes from Linux; you can now do something like mkdir -p hurd-root/servers/socket touch hurd-root/servers/socket/1 setfattr --name=gnu.translator --value='"/hurd/pflocal\0"' \ hurd-root/servers/socket/1 getfattr --name=gnu.translator hurd-root/servers/socket/1 # file: 1 gnu.translator="/hurd/pflocal" to setup a pipe translator, which is being used to create[3] a vm-image for the Hurd from GNU Guix. [0] https://summerofcode.withgoogle.com/projects/#5869799859027968 [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3980bd3b406addb327d858aebd19e229ea340b9a [2] https://git.savannah.gnu.org/cgit/hurd/hurd.git/commit/?id=a04c7bf83172faa7cb080fbe3b6c04a8415ca645 [3] https://git.savannah.gnu.org/cgit/guix.git/log/?h=wip-hurd-vm Signed-off-by: Jan Nieuwenhuizen <janneke@gnu.org> Link: https://lore.kernel.org/r/20200525193940.878-1-janneke@gnu.org Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -9,7 +9,8 @@ ext4-y := balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \
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extents_status.o file.o fsmap.o fsync.o hash.o ialloc.o \
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indirect.o inline.o inode.o ioctl.o mballoc.o migrate.o \
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mmp.o move_extent.o namei.o page-io.o readpage.o resize.o \
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super.o symlink.o sysfs.o xattr.o xattr_trusted.o xattr_user.o
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super.o symlink.o sysfs.o xattr.o xattr_hurd.o xattr_trusted.o \
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xattr_user.o
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ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
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ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
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@ -93,6 +93,7 @@ static const struct xattr_handler * const ext4_xattr_handler_map[] = {
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#ifdef CONFIG_EXT4_FS_SECURITY
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[EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler,
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#endif
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[EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler,
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};
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const struct xattr_handler *ext4_xattr_handlers[] = {
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@ -105,6 +106,7 @@ const struct xattr_handler *ext4_xattr_handlers[] = {
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#ifdef CONFIG_EXT4_FS_SECURITY
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&ext4_xattr_security_handler,
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#endif
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&ext4_xattr_hurd_handler,
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NULL
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};
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@ -124,6 +124,7 @@ struct ext4_xattr_inode_array {
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extern const struct xattr_handler ext4_xattr_user_handler;
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extern const struct xattr_handler ext4_xattr_trusted_handler;
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extern const struct xattr_handler ext4_xattr_security_handler;
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extern const struct xattr_handler ext4_xattr_hurd_handler;
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#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
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51
fs/ext4/xattr_hurd.c
Normal file
51
fs/ext4/xattr_hurd.c
Normal file
@ -0,0 +1,51 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/xattr_hurd.c
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* Handler for extended gnu attributes for the Hurd.
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*
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* Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
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* Copyright (C) 2020 by Jan (janneke) Nieuwenhuizen, <janneke@gnu.org>
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include "ext4.h"
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#include "xattr.h"
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static bool
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ext4_xattr_hurd_list(struct dentry *dentry)
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{
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return test_opt(dentry->d_sb, XATTR_USER);
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}
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static int
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ext4_xattr_hurd_get(const struct xattr_handler *handler,
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struct dentry *unused, struct inode *inode,
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const char *name, void *buffer, size_t size)
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{
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if (!test_opt(inode->i_sb, XATTR_USER))
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return -EOPNOTSUPP;
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return ext4_xattr_get(inode, EXT4_XATTR_INDEX_HURD,
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name, buffer, size);
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}
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static int
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ext4_xattr_hurd_set(const struct xattr_handler *handler,
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struct dentry *unused, struct inode *inode,
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const char *name, const void *value,
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size_t size, int flags)
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{
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if (!test_opt(inode->i_sb, XATTR_USER))
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return -EOPNOTSUPP;
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return ext4_xattr_set(inode, EXT4_XATTR_INDEX_HURD,
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name, value, size, flags);
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}
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const struct xattr_handler ext4_xattr_hurd_handler = {
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.prefix = XATTR_HURD_PREFIX,
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.list = ext4_xattr_hurd_list,
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.get = ext4_xattr_hurd_get,
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.set = ext4_xattr_hurd_set,
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};
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@ -7,6 +7,7 @@
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Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
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Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
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Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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Copyright (c) 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*/
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#include <linux/libc-compat.h>
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@ -31,6 +32,9 @@
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#define XATTR_BTRFS_PREFIX "btrfs."
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#define XATTR_BTRFS_PREFIX_LEN (sizeof(XATTR_BTRFS_PREFIX) - 1)
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#define XATTR_HURD_PREFIX "gnu."
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#define XATTR_HURD_PREFIX_LEN (sizeof(XATTR_HURD_PREFIX) - 1)
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#define XATTR_SECURITY_PREFIX "security."
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#define XATTR_SECURITY_PREFIX_LEN (sizeof(XATTR_SECURITY_PREFIX) - 1)
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