xattr_trusted.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 82 行

#include <linux/reiserfs_fs.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/reiserfs_xattr.h>
#include <asm/uaccess.h>

#define XATTR_TRUSTED_PREFIX "trusted."

static int
trusted_get (struct inode *inode, const char *name, void *buffer, size_t size)
{
    if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
        return -EINVAL;

    if (!reiserfs_xattrs (inode->i_sb))
        return -EOPNOTSUPP;

    if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
        return -EPERM;

    return reiserfs_xattr_get (inode, name, buffer, size);
}

static int
trusted_set (struct inode *inode, const char *name, const void *buffer,
          size_t size, int flags)
{
    if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
        return -EINVAL;

    if (!reiserfs_xattrs (inode->i_sb))
        return -EOPNOTSUPP;

    if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
        return -EPERM;

    return reiserfs_xattr_set (inode, name, buffer, size, flags);
}

static int
trusted_del (struct inode *inode, const char *name)
{
    if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
        return -EINVAL;

    if (!reiserfs_xattrs (inode->i_sb))
        return -EOPNOTSUPP;

    if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
        return -EPERM;

    return 0;
}

static int
trusted_list (struct inode *inode, const char *name, int namelen, char *out)
{
    int len = namelen;

    if (!reiserfs_xattrs (inode->i_sb))
        return 0;

    if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
        return 0;

    if (out)
        memcpy (out, name, len);

    return len;
}


struct reiserfs_xattr_handler trusted_handler = {
	.prefix = XATTR_TRUSTED_PREFIX,
	.get = trusted_get,
	.set = trusted_set,
	.del = trusted_del,
	.list = trusted_list,
};