forked from Minki/linux
003ff182fd
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>
142 lines
4.6 KiB
C
142 lines
4.6 KiB
C
/*
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* sufile.h - NILFS segment usage 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_SUFILE_H
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#define _NILFS_SUFILE_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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#include "mdt.h"
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#define NILFS_SUFILE_GFP NILFS_MDT_GFP
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static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
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{
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return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
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}
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int nilfs_sufile_alloc(struct inode *, __u64 *);
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int nilfs_sufile_get_segment_usage(struct inode *, __u64,
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struct nilfs_segment_usage **,
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struct buffer_head **);
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void nilfs_sufile_put_segment_usage(struct inode *, __u64,
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struct buffer_head *);
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int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
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int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *);
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ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
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size_t);
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int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *));
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int nilfs_sufile_update(struct inode *, __u64, int,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *));
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void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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/**
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* nilfs_sufile_scrap - make a segment garbage
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* @sufile: inode of segment usage file
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* @segnum: segment number to be freed
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*/
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static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
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}
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/**
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* nilfs_sufile_free - free segment
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* @sufile: inode of segment usage file
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* @segnum: segment number to be freed
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*/
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static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
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}
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/**
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* nilfs_sufile_freev - free segments
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* @sufile: inode of segment usage file
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* @segnumv: array of segment numbers
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* @nsegs: size of @segnumv array
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* @ndone: place to store the number of freed segments
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*/
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static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
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size_t nsegs, size_t *ndone)
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{
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return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
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nilfs_sufile_do_free);
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}
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/**
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* nilfs_sufile_cancel_freev - reallocate freeing segments
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* @sufile: inode of segment usage file
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* @segnumv: array of segment numbers
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* @nsegs: size of @segnumv array
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* @ndone: place to store the number of cancelled segments
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*
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* Return Value: On success, 0 is returned. On error, a negative error codes
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* is returned.
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*/
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static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
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__u64 *segnumv, size_t nsegs,
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size_t *ndone)
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{
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return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
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nilfs_sufile_do_cancel_free);
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}
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/**
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* nilfs_sufile_set_error - mark a segment as erroneous
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* @sufile: inode of segment usage file
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* @segnum: segment number
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*
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* Description: nilfs_sufile_set_error() marks the segment specified by
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* @segnum as erroneous. The error segment will never be used again.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EINVAL - Invalid segment usage number.
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*/
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static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 0,
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nilfs_sufile_do_set_error);
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}
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#endif /* _NILFS_SUFILE_H */
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