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Nilfs has some ioctl commands to read out metadata from meta data
files:
- NILFS_IOCTL_GET_CPINFO for checkpoint file,
- NILFS_IOCTL_GET_SUINFO for segment usage file, and
- NILFS_IOCTL_GET_VINFO for Disk Address Transalation (DAT) file,
respectively.
Every routine on these metadata files is implemented so that it allows
future expansion of on-disk format. But, the above ioctl commands do
not support expansion even though nilfs_argv structure can handle
arbitrary size for data exchanged via ioctl.
This allows future expansion of the following structures which give
basic format of the "get information" ioctls:
- struct nilfs_cpinfo
- struct nilfs_suinfo
- struct nilfs_vinfo
So, this introduces forward compatility of such ioctl commands.
In this patch, a sanity check in nilfs_ioctl_get_info() function is
changed to accept larger data structure [1], and metadata read
routines are rewritten so that they become compatible for larger
structures; the routines will just ignore the remaining fields which
the current version of nilfs doesn't know.
[1] The ioctl function already has another upper limit (PAGE_SIZE
against a structure, which appears in nilfs_ioctl_wrap_copy
function), and this will not cause security problem.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/*
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* cpfile.h - NILFS checkpoint file.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#ifndef _NILFS_CPFILE_H
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#define _NILFS_CPFILE_H
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/nilfs2_fs.h>
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#define NILFS_CPFILE_GFP NILFS_MDT_GFP
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int nilfs_cpfile_get_checkpoint(struct inode *, __u64, int,
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struct nilfs_checkpoint **,
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struct buffer_head **);
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void nilfs_cpfile_put_checkpoint(struct inode *, __u64, struct buffer_head *);
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int nilfs_cpfile_delete_checkpoints(struct inode *, __u64, __u64);
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int nilfs_cpfile_delete_checkpoint(struct inode *, __u64);
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int nilfs_cpfile_change_cpmode(struct inode *, __u64, int);
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int nilfs_cpfile_is_snapshot(struct inode *, __u64);
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int nilfs_cpfile_get_stat(struct inode *, struct nilfs_cpstat *);
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ssize_t nilfs_cpfile_get_cpinfo(struct inode *, __u64 *, int, void *, unsigned,
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size_t);
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#endif /* _NILFS_CPFILE_H */
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