d9a738597f
Allow requests for security.* and trusted.* xattr name spaces to pass through to server. The new files are 99% cut and paste from fs/9p/xattr_user.c with the namespaces changed. It has the intended effect in superficial testing. I do not know much detail about how these namespaces are used, but passing them through to the server, which can decide whether to handle them or not, seems reasonable. I want to support a use case where an ext4 file system is mounted via 9P, then re-exported via samba to windows clients in a cluster. Windows wants to store xattrs such as security.NTACL. This works when ext4 directly backs samba, but not when 9P is inserted. This use case is documented here: http://code.google.com/p/diod/issues/detail?id=95 Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/*
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* Copyright IBM Corporation, 2010
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include "xattr.h"
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static int v9fs_xattr_trusted_get(struct dentry *dentry, const char *name,
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void *buffer, size_t size, int type)
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{
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int retval;
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char *full_name;
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size_t name_len;
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size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
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if (name == NULL)
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return -EINVAL;
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if (strcmp(name, "") == 0)
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return -EINVAL;
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name_len = strlen(name);
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full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
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if (!full_name)
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return -ENOMEM;
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memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
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memcpy(full_name+prefix_len, name, name_len);
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full_name[prefix_len + name_len] = '\0';
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retval = v9fs_xattr_get(dentry, full_name, buffer, size);
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kfree(full_name);
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return retval;
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}
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static int v9fs_xattr_trusted_set(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags, int type)
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{
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int retval;
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char *full_name;
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size_t name_len;
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size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
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if (name == NULL)
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return -EINVAL;
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if (strcmp(name, "") == 0)
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return -EINVAL;
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name_len = strlen(name);
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full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
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if (!full_name)
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return -ENOMEM;
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memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
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memcpy(full_name + prefix_len, name, name_len);
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full_name[prefix_len + name_len] = '\0';
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retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
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kfree(full_name);
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return retval;
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}
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struct xattr_handler v9fs_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.get = v9fs_xattr_trusted_get,
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.set = v9fs_xattr_trusted_set,
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};
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