xattr_user.c

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/*
 * Copyright IBM Corporation, 2010
 * Author Aneesh Kumar K.V <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser 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.
 *
 */


#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include "xattr.h"

static int v9fs_xattr_user_get(struct dentry *dentry, const char *name,
            void *buffer, size_t size, int type)
{
    int retval;
    char *full_name;
    size_t name_len;
    size_t prefix_len = XATTR_USER_PREFIX_LEN;

    if (name == NULL)
        return -EINVAL;

    if (strcmp(name, "") == 0)
        return -EINVAL;

    name_len = strlen(name);
    full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
    if (!full_name)
        return -ENOMEM;
    memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
    memcpy(full_name+prefix_len, name, name_len);
    full_name[prefix_len + name_len] = '\0';

    retval = v9fs_xattr_get(dentry, full_name, buffer, size);
    kfree(full_name);
    return retval;
}

static int v9fs_xattr_user_set(struct dentry *dentry, const char *name,
            const void *value, size_t size, int flags, int type)
{
    int retval;
    char *full_name;
    size_t name_len;
    size_t prefix_len = XATTR_USER_PREFIX_LEN;

    if (name == NULL)
        return -EINVAL;

    if (strcmp(name, "") == 0)
        return -EINVAL;

    name_len = strlen(name);
    full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
    if (!full_name)
        return -ENOMEM;
    memcpy(full_name, XATTR_USER_PREFIX, prefix_len);
    memcpy(full_name + prefix_len, name, name_len);
    full_name[prefix_len + name_len] = '\0';

    retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
    kfree(full_name);
    return retval;
}

struct xattr_handler v9fs_xattr_user_handler = {
    .prefix = XATTR_USER_PREFIX,
    .get    = v9fs_xattr_user_get,
    .set    = v9fs_xattr_user_set,
};