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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>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
// 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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