[linux-2.6-block.git] / fs / nilfs2 / ioctl.c

/*
 * ioctl.c - NILFS ioctl operations.
 *
 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Koji Sato <koji@osrg.net>.
 */

#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/smp_lock.h>	/* lock_kernel(), unlock_kernel() */
#include <linux/capability.h>	/* capable() */
#include <linux/uaccess.h>	/* copy_from_user(), copy_to_user() */
#include <linux/nilfs2_fs.h>
#include "nilfs.h"
#include "segment.h"
#include "bmap.h"
#include "cpfile.h"
#include "sufile.h"
#include "dat.h"


static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
				 struct nilfs_argv *argv, int dir,
				 ssize_t (*dofunc)(struct the_nilfs *,
						   __u64 *, int,
						   void *, size_t, size_t))
{
	void *buf;
	void __user *base = (void __user *)(unsigned long)argv->v_base;
	size_t maxmembs, total, n;
	ssize_t nr;
	int ret, i;
	__u64 pos, ppos;

	if (argv->v_nmembs == 0)
		return 0;

	if (argv->v_size > PAGE_SIZE)
		return -EINVAL;

	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	if (unlikely(!buf))
		return -ENOMEM;
	maxmembs = PAGE_SIZE / argv->v_size;

	ret = 0;
	total = 0;
	pos = argv->v_index;
	for (i = 0; i < argv->v_nmembs; i += n) {
		n = (argv->v_nmembs - i < maxmembs) ?
			argv->v_nmembs - i : maxmembs;
		if ((dir & _IOC_WRITE) &&
		    copy_from_user(buf, base + argv->v_size * i,
				   argv->v_size * n)) {
			ret = -EFAULT;
			break;
		}
		ppos = pos;
		nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
			       n);
		if (nr < 0) {
			ret = nr;
			break;
		}
		if ((dir & _IOC_READ) &&
		    copy_to_user(base + argv->v_size * i, buf,
				 argv->v_size * nr)) {
			ret = -EFAULT;
			break;
		}
		total += nr;
		if ((size_t)nr < n)
			break;
		if (pos == ppos)
			pos += n;
	}
	argv->v_nmembs = total;

	free_pages((unsigned long)buf, 0);
	return ret;
}

static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
				     unsigned int cmd, void __user *argp)
{
	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	struct nilfs_transaction_info ti;
	struct nilfs_cpmode cpmode;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
		return -EFAULT;

	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	ret = nilfs_cpfile_change_cpmode(
		cpfile, cpmode.cm_cno, cpmode.cm_mode);
	if (unlikely(ret < 0)) {
		nilfs_transaction_abort(inode->i_sb);
		return ret;
	}
	nilfs_transaction_commit(inode->i_sb); /* never fails */
	return ret;
}

static int
nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
			      unsigned int cmd, void __user *argp)
{
	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	struct nilfs_transaction_info ti;
	__u64 cno;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (copy_from_user(&cno, argp, sizeof(cno)))
		return -EFAULT;

	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
	if (unlikely(ret < 0)) {
		nilfs_transaction_abort(inode->i_sb);
		return ret;
	}
	nilfs_transaction_commit(inode->i_sb); /* never fails */
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
				       nmembs);
}

static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

	if (copy_from_user(&argv, argp, sizeof(argv)))
		return -EFAULT;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_cpinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_cpstat cpstat;
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
}

static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

	if (copy_from_user(&argv, argp, sizeof(argv)))
		return -EFAULT;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_suinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_sustat sustat;
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &sustat, sizeof(sustat)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
			 void *buf, size_t size, size_t nmembs)
{
	return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
}

static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
				 unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

	if (copy_from_user(&argv, argp, sizeof(argv)))
		return -EFAULT;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_vinfo);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static ssize_t
nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
			  void *buf, size_t size, size_t nmembs)
{
	struct inode *dat = nilfs_dat_inode(nilfs);
	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	struct nilfs_bdesc *bdescs = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		ret = nilfs_bmap_lookup_at_level(bmap,
						 bdescs[i].bd_offset,
						 bdescs[i].bd_level + 1,
						 &bdescs[i].bd_blocknr);
		if (ret < 0) {
			if (ret != -ENOENT)
				return ret;
			bdescs[i].bd_blocknr = 0;
		}
	}
	return nmembs;
}

static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
				  unsigned int cmd, void __user *argp)
{
	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct nilfs_argv argv;
	int ret;

	if (copy_from_user(&argv, argp, sizeof(argv)))
		return -EFAULT;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_bdescs);
	up_read(&nilfs->ns_segctor_sem);
	if (ret < 0)
		return ret;

	if (copy_to_user(argp, &argv, sizeof(argv)))
		ret = -EFAULT;
	return ret;
}

static int nilfs_ioctl_move_inode_block(struct inode *inode,
					struct nilfs_vdesc *vdesc,
					struct list_head *buffers)
{
	struct buffer_head *bh;
	int ret;

	if (vdesc->vd_flags == 0)
		ret = nilfs_gccache_submit_read_data(
			inode, vdesc->vd_offset, vdesc->vd_blocknr,
			vdesc->vd_vblocknr, &bh);
	else
		ret = nilfs_gccache_submit_read_node(
			inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);

	if (unlikely(ret < 0)) {
		if (ret == -ENOENT)
			printk(KERN_CRIT
			       "%s: invalid virtual block address (%s): "
			       "ino=%llu, cno=%llu, offset=%llu, "
			       "blocknr=%llu, vblocknr=%llu\n",
			       __func__, vdesc->vd_flags ? "node" : "data",
			       (unsigned long long)vdesc->vd_ino,
			       (unsigned long long)vdesc->vd_cno,
			       (unsigned long long)vdesc->vd_offset,
			       (unsigned long long)vdesc->vd_blocknr,
			       (unsigned long long)vdesc->vd_vblocknr);
		return ret;
	}
	bh->b_private = vdesc;
	list_add_tail(&bh->b_assoc_buffers, buffers);
	return 0;
}

static ssize_t
nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
			   void *buf, size_t size, size_t nmembs)
{
	struct inode *inode;
	struct nilfs_vdesc *vdesc;
	struct buffer_head *bh, *n;
	LIST_HEAD(buffers);
	ino_t ino;
	__u64 cno;
	int i, ret;

	for (i = 0, vdesc = buf; i < nmembs; ) {
		ino = vdesc->vd_ino;
		cno = vdesc->vd_cno;
		inode = nilfs_gc_iget(nilfs, ino, cno);
		if (unlikely(inode == NULL)) {
			ret = -ENOMEM;
			goto failed;
		}
		do {
			ret = nilfs_ioctl_move_inode_block(inode, vdesc,
							   &buffers);
			if (unlikely(ret < 0))
				goto failed;
			vdesc++;
		} while (++i < nmembs &&
			 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	}

	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
		ret = nilfs_gccache_wait_and_mark_dirty(bh);
		if (unlikely(ret < 0)) {
			if (ret == -EEXIST) {
				vdesc = bh->b_private;
				printk(KERN_CRIT
				       "%s: conflicting %s buffer: "
				       "ino=%llu, cno=%llu, offset=%llu, "
				       "blocknr=%llu, vblocknr=%llu\n",
				       __func__,
				       vdesc->vd_flags ? "node" : "data",
				       (unsigned long long)vdesc->vd_ino,
				       (unsigned long long)vdesc->vd_cno,
				       (unsigned long long)vdesc->vd_offset,
				       (unsigned long long)vdesc->vd_blocknr,
				       (unsigned long long)vdesc->vd_vblocknr);
			}
			goto failed;
		}
		list_del_init(&bh->b_assoc_buffers);
		bh->b_private = NULL;
		brelse(bh);
	}
	return nmembs;

 failed:
	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
		list_del_init(&bh->b_assoc_buffers);
		bh->b_private = NULL;
		brelse(bh);
	}
	return ret;
}

static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
					  struct nilfs_argv *argv,
					  int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_move_blocks);
}

static ssize_t
nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
				  int flags, void *buf, size_t size,
				  size_t nmembs)
{
	struct inode *cpfile = nilfs->ns_cpfile;
	struct nilfs_period *periods = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		ret = nilfs_cpfile_delete_checkpoints(
			cpfile, periods[i].p_start, periods[i].p_end);
		if (ret < 0)
			return ret;
	}
	return nmembs;
}

static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
						 struct nilfs_argv *argv,
						 int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_delete_checkpoints);
}

static ssize_t
nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
			      void *buf, size_t size, size_t nmembs)
{
	int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);

	return (ret < 0) ? ret : nmembs;
}

static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
					     struct nilfs_argv *argv,
					     int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_free_vblocknrs);
}

static ssize_t
nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
				 int flags, void *buf, size_t size,
				 size_t nmembs)
{
	struct inode *dat = nilfs_dat_inode(nilfs);
	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	struct nilfs_bdesc *bdescs = buf;
	int ret, i;

	for (i = 0; i < nmembs; i++) {
		/* XXX: use macro or inline func to check liveness */
		ret = nilfs_bmap_lookup_at_level(bmap,
						 bdescs[i].bd_offset,
						 bdescs[i].bd_level + 1,
						 &bdescs[i].bd_blocknr);
		if (ret < 0) {
			if (ret != -ENOENT)
				return ret;
			bdescs[i].bd_blocknr = 0;
		}
		if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
			/* skip dead block */
			continue;
		if (bdescs[i].bd_level == 0) {
			ret = nilfs_mdt_mark_block_dirty(dat,
							 bdescs[i].bd_offset);
			if (ret < 0) {
				WARN_ON(ret == -ENOENT);
				return ret;
			}
		} else {
			ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
					      bdescs[i].bd_level);
			if (ret < 0) {
				WARN_ON(ret == -ENOENT);
				return ret;
			}
		}
	}
	return nmembs;
}

static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
						struct nilfs_argv *argv,
						int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_mark_blocks_dirty);
}

static ssize_t
nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
			     void *buf, size_t size, size_t nmembs)
{
	struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
	int ret;

	if (unlikely(!sbi))
		return -EROFS;
	ret = nilfs_segctor_add_segments_to_be_freed(
		NILFS_SC(sbi), buf, nmembs);
	nilfs_put_writer(nilfs);

	return (ret < 0) ? ret : nmembs;
}

static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
					     struct nilfs_argv *argv,
					     int dir)
{
	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
				     nilfs_ioctl_do_free_segments);
}

int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
				       void __user *argp)
{
	struct nilfs_argv argv[5];
	const char *msg;
	int dir, ret;

	if (copy_from_user(argv, argp, sizeof(argv)))
		return -EFAULT;

	dir = _IOC_WRITE;
	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
	if (ret < 0) {
		msg = "cannot read source blocks";
		goto failed;
	}
	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
	if (ret < 0) {
		/*
		 * can safely abort because checkpoints can be removed
		 * independently.
		 */
		msg = "cannot delete checkpoints";
		goto failed;
	}
	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
	if (ret < 0) {
		/*
		 * can safely abort because DAT file is updated atomically
		 * using a copy-on-write technique.
		 */
		msg = "cannot delete virtual blocks from DAT file";
		goto failed;
	}
	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
	if (ret < 0) {
		/*
		 * can safely abort because the operation is nondestructive.
		 */
		msg = "cannot mark copying blocks dirty";
		goto failed;
	}
	ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
	if (ret < 0) {
		/*
		 * can safely abort because this operation is atomic.
		 */
		msg = "cannot set segments to be freed";
		goto failed;
	}
	return 0;

 failed:
	nilfs_remove_all_gcinode(nilfs);
	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
	       msg, ret);
	return ret;
}

static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
				      unsigned int cmd, void __user *argp)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	return nilfs_clean_segments(inode->i_sb, argp);
}

static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
			    unsigned int cmd, void __user *argp)
{
	__u64 cno;
	int ret;

	ret = nilfs_construct_segment(inode->i_sb);
	if (ret < 0)
		return ret;

	if (argp != NULL) {
		cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
		if (copy_to_user(argp, &cno, sizeof(cno)))
			return -EFAULT;
	}
	return 0;
}

long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;
	void __user *argp = (void * __user *)arg;

	switch (cmd) {
	case NILFS_IOCTL_CHANGE_CPMODE:
		return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	case NILFS_IOCTL_DELETE_CHECKPOINT:
		return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_CPINFO:
		return nilfs_ioctl_get_cpinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_CPSTAT:
		return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_SUINFO:
		return nilfs_ioctl_get_suinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_SUSTAT:
		return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_VINFO:
		/* XXX: rename to ??? */
		return nilfs_ioctl_get_vinfo(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_BDESCS:
		return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	case NILFS_IOCTL_CLEAN_SEGMENTS:
		return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
	case NILFS_IOCTL_SYNC:
		return nilfs_ioctl_sync(inode, filp, cmd, argp);
	default:
		return -ENOTTY;
	}
}
Commit	Line	Data
7942b919 KS	1	/*
	2	* ioctl.c - NILFS ioctl operations.
	3	*
	4	* Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Written by Koji Sato <koji@osrg.net>.
	21	*/
	22
	23	#include <linux/fs.h>
	24	#include <linux/wait.h>
	25	#include <linux/smp_lock.h> /* lock_kernel(), unlock_kernel() */
	26	#include <linux/capability.h> /* capable() */
	27	#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
	28	#include <linux/nilfs2_fs.h>
	29	#include "nilfs.h"
	30	#include "segment.h"
	31	#include "bmap.h"
	32	#include "cpfile.h"
	33	#include "sufile.h"
	34	#include "dat.h"
	35
	36
7942b919 KS	37	static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
	38	struct nilfs_argv *argv, int dir,
	39	ssize_t (dofunc)(struct the_nilfs ,
b028fcfc	40	__u64 *, int,
7942b919 KS	41	void *, size_t, size_t))
	42	{
	43	void *buf;
dc498d09	44	void __user base = (void __user )(unsigned long)argv->v_base;
3358b4aa	45	size_t maxmembs, total, n;
7942b919 KS	46	ssize_t nr;
7942b919 KS	47	int ret, i;
b028fcfc	48	__u64 pos, ppos;
7942b919 KS	49
	50	if (argv->v_nmembs == 0)
	51	return 0;
	52
3358b4aa RK	53	if (argv->v_size > PAGE_SIZE)
	54	return -EINVAL;
	55
	56	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	57	if (unlikely(!buf))
7942b919	58	return -ENOMEM;
3358b4aa	59	maxmembs = PAGE_SIZE / argv->v_size;
7942b919 KS	60
	61	ret = 0;
	62	total = 0;
b028fcfc	63	pos = argv->v_index;
7942b919 KS	64	for (i = 0; i < argv->v_nmembs; i += n) {
	65	n = (argv->v_nmembs - i < maxmembs) ?
	66	argv->v_nmembs - i : maxmembs;
	67	if ((dir & _IOC_WRITE) &&
dc498d09 RK	68	copy_from_user(buf, base + argv->v_size * i,
dc498d09 RK	69	argv->v_size * n)) {
7942b919 KS	70	ret = -EFAULT;
	71	break;
	72	}
b028fcfc	73	ppos = pos;
8acfbf09	74	nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
b028fcfc	75	n);
7942b919 KS	76	if (nr < 0) {
	77	ret = nr;
	78	break;
	79	}
	80	if ((dir & _IOC_READ) &&
dc498d09 RK	81	copy_to_user(base + argv->v_size * i, buf,
dc498d09 RK	82	argv->v_size * nr)) {
7942b919 KS	83	ret = -EFAULT;
	84	break;
	85	}
	86	total += nr;
b028fcfc RK	87	if ((size_t)nr < n)
	88	break;
	89	if (pos == ppos)
	90	pos += n;
7942b919 KS	91	}
	92	argv->v_nmembs = total;
	93
3358b4aa	94	free_pages((unsigned long)buf, 0);
7942b919 KS	95	return ret;
	96	}
	97
	98	static int nilfs_ioctl_change_cpmode(struct inode inode, struct file filp,
	99	unsigned int cmd, void __user *argp)
	100	{
	101	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	102	struct nilfs_transaction_info ti;
	103	struct nilfs_cpmode cpmode;
	104	int ret;
	105
	106	if (!capable(CAP_SYS_ADMIN))
	107	return -EPERM;
	108	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
	109	return -EFAULT;
	110
	111	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	112	ret = nilfs_cpfile_change_cpmode(
	113	cpfile, cpmode.cm_cno, cpmode.cm_mode);
47420c79 RK	114	if (unlikely(ret < 0)) {
	115	nilfs_transaction_abort(inode->i_sb);
	116	return ret;
	117	}
	118	nilfs_transaction_commit(inode->i_sb); /* never fails */
7942b919 KS	119	return ret;
	120	}
	121
	122	static int
	123	nilfs_ioctl_delete_checkpoint(struct inode inode, struct file filp,
	124	unsigned int cmd, void __user *argp)
	125	{
	126	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	127	struct nilfs_transaction_info ti;
	128	__u64 cno;
	129	int ret;
	130
	131	if (!capable(CAP_SYS_ADMIN))
	132	return -EPERM;
	133	if (copy_from_user(&cno, argp, sizeof(cno)))
	134	return -EFAULT;
	135
	136	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	137	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
47420c79 RK	138	if (unlikely(ret < 0)) {
	139	nilfs_transaction_abort(inode->i_sb);
	140	return ret;
	141	}
	142	nilfs_transaction_commit(inode->i_sb); /* never fails */
7942b919 KS	143	return ret;
	144	}
	145
	146	static ssize_t
b028fcfc	147	nilfs_ioctl_do_get_cpinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	148	void *buf, size_t size, size_t nmembs)
7942b919 KS	149	{
b028fcfc	150	return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
7942b919 KS	151	nmembs);
	152	}
	153
	154	static int nilfs_ioctl_get_cpinfo(struct inode inode, struct file filp,
	155	unsigned int cmd, void __user *argp)
	156	{
	157	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	158	struct nilfs_argv argv;
7942b919 KS	159	int ret;
	160
	161	if (copy_from_user(&argv, argp, sizeof(argv)))
	162	return -EFAULT;
	163
47420c79	164	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	165	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	166	nilfs_ioctl_do_get_cpinfo);
47420c79 RK	167	up_read(&nilfs->ns_segctor_sem);
	168	if (ret < 0)
	169	return ret;
7942b919 KS	170
	171	if (copy_to_user(argp, &argv, sizeof(argv)))
	172	ret = -EFAULT;
	173	return ret;
	174	}
	175
	176	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	177	unsigned int cmd, void __user *argp)
	178	{
47420c79	179	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	180	struct nilfs_cpstat cpstat;
7942b919 KS	181	int ret;
7942b919 KS	182
47420c79 RK	183	down_read(&nilfs->ns_segctor_sem);
	184	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	185	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	186	if (ret < 0)
	187	return ret;
	188
	189	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	190	ret = -EFAULT;
	191	return ret;
	192	}
	193
	194	static ssize_t
b028fcfc	195	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	196	void *buf, size_t size, size_t nmembs)
7942b919 KS	197	{
b028fcfc	198	return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
7942b919 KS	199	}
	200
	201	static int nilfs_ioctl_get_suinfo(struct inode inode, struct file filp,
	202	unsigned int cmd, void __user *argp)
	203	{
	204	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	205	struct nilfs_argv argv;
7942b919 KS	206	int ret;
	207
	208	if (copy_from_user(&argv, argp, sizeof(argv)))
	209	return -EFAULT;
	210
47420c79	211	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	212	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	213	nilfs_ioctl_do_get_suinfo);
47420c79 RK	214	up_read(&nilfs->ns_segctor_sem);
	215	if (ret < 0)
	216	return ret;
7942b919 KS	217
	218	if (copy_to_user(argp, &argv, sizeof(argv)))
	219	ret = -EFAULT;
	220	return ret;
	221	}
	222
	223	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	224	unsigned int cmd, void __user *argp)
	225	{
47420c79	226	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	227	struct nilfs_sustat sustat;
7942b919 KS	228	int ret;
7942b919 KS	229
47420c79 RK	230	down_read(&nilfs->ns_segctor_sem);
	231	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	232	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	233	if (ret < 0)
	234	return ret;
	235
	236	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	237	ret = -EFAULT;
	238	return ret;
	239	}
	240
	241	static ssize_t
b028fcfc	242	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	243	void *buf, size_t size, size_t nmembs)
	244	{
	245	return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
	246	}
	247
	248	static int nilfs_ioctl_get_vinfo(struct inode inode, struct file filp,
	249	unsigned int cmd, void __user *argp)
	250	{
	251	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	252	struct nilfs_argv argv;
7942b919 KS	253	int ret;
	254
	255	if (copy_from_user(&argv, argp, sizeof(argv)))
	256	return -EFAULT;
	257
47420c79	258	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	259	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	260	nilfs_ioctl_do_get_vinfo);
47420c79 RK	261	up_read(&nilfs->ns_segctor_sem);
	262	if (ret < 0)
	263	return ret;
7942b919 KS	264
	265	if (copy_to_user(argp, &argv, sizeof(argv)))
	266	ret = -EFAULT;
	267	return ret;
	268	}
	269
	270	static ssize_t
b028fcfc	271	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	272	void *buf, size_t size, size_t nmembs)
	273	{
	274	struct inode *dat = nilfs_dat_inode(nilfs);
	275	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	276	struct nilfs_bdesc *bdescs = buf;
	277	int ret, i;
	278
	279	for (i = 0; i < nmembs; i++) {
	280	ret = nilfs_bmap_lookup_at_level(bmap,
	281	bdescs[i].bd_offset,
	282	bdescs[i].bd_level + 1,
	283	&bdescs[i].bd_blocknr);
	284	if (ret < 0) {
	285	if (ret != -ENOENT)
	286	return ret;
	287	bdescs[i].bd_blocknr = 0;
	288	}
	289	}
	290	return nmembs;
	291	}
	292
	293	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	294	unsigned int cmd, void __user *argp)
	295	{
	296	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	297	struct nilfs_argv argv;
7942b919 KS	298	int ret;
	299
	300	if (copy_from_user(&argv, argp, sizeof(argv)))
	301	return -EFAULT;
	302
47420c79	303	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	304	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	305	nilfs_ioctl_do_get_bdescs);
47420c79 RK	306	up_read(&nilfs->ns_segctor_sem);
	307	if (ret < 0)
	308	return ret;
7942b919 KS	309
	310	if (copy_to_user(argp, &argv, sizeof(argv)))
	311	ret = -EFAULT;
	312	return ret;
	313	}
	314
	315	static int nilfs_ioctl_move_inode_block(struct inode *inode,
	316	struct nilfs_vdesc *vdesc,
	317	struct list_head *buffers)
	318	{
	319	struct buffer_head *bh;
	320	int ret;
	321
	322	if (vdesc->vd_flags == 0)
	323	ret = nilfs_gccache_submit_read_data(
	324	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	325	vdesc->vd_vblocknr, &bh);
	326	else
	327	ret = nilfs_gccache_submit_read_node(
	328	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	329
	330	if (unlikely(ret < 0)) {
	331	if (ret == -ENOENT)
	332	printk(KERN_CRIT
	333	"%s: invalid virtual block address (%s): "
	334	"ino=%llu, cno=%llu, offset=%llu, "
	335	"blocknr=%llu, vblocknr=%llu\n",
	336	__func__, vdesc->vd_flags ? "node" : "data",
	337	(unsigned long long)vdesc->vd_ino,
	338	(unsigned long long)vdesc->vd_cno,
	339	(unsigned long long)vdesc->vd_offset,
	340	(unsigned long long)vdesc->vd_blocknr,
	341	(unsigned long long)vdesc->vd_vblocknr);
	342	return ret;
	343	}
	344	bh->b_private = vdesc;
	345	list_add_tail(&bh->b_assoc_buffers, buffers);
	346	return 0;
	347	}
	348
	349	static ssize_t
b028fcfc	350	nilfs_ioctl_do_move_blocks(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	351	void *buf, size_t size, size_t nmembs)
	352	{
	353	struct inode *inode;
	354	struct nilfs_vdesc *vdesc;
	355	struct buffer_head bh, n;
	356	LIST_HEAD(buffers);
	357	ino_t ino;
	358	__u64 cno;
	359	int i, ret;
	360
	361	for (i = 0, vdesc = buf; i < nmembs; ) {
	362	ino = vdesc->vd_ino;
	363	cno = vdesc->vd_cno;
	364	inode = nilfs_gc_iget(nilfs, ino, cno);
	365	if (unlikely(inode == NULL)) {
	366	ret = -ENOMEM;
	367	goto failed;
	368	}
	369	do {
	370	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	371	&buffers);
	372	if (unlikely(ret < 0))
	373	goto failed;
	374	vdesc++;
	375	} while (++i < nmembs &&
	376	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	377	}
	378
	379	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	380	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	381	if (unlikely(ret < 0)) {
	382	if (ret == -EEXIST) {
	383	vdesc = bh->b_private;
	384	printk(KERN_CRIT
	385	"%s: conflicting %s buffer: "
	386	"ino=%llu, cno=%llu, offset=%llu, "
	387	"blocknr=%llu, vblocknr=%llu\n",
	388	__func__,
	389	vdesc->vd_flags ? "node" : "data",
	390	(unsigned long long)vdesc->vd_ino,
	391	(unsigned long long)vdesc->vd_cno,
	392	(unsigned long long)vdesc->vd_offset,
	393	(unsigned long long)vdesc->vd_blocknr,
	394	(unsigned long long)vdesc->vd_vblocknr);
	395	}
	396	goto failed;
	397	}
	398	list_del_init(&bh->b_assoc_buffers);
	399	bh->b_private = NULL;
	400	brelse(bh);
	401	}
	402	return nmembs;
	403
	404	failed:
	405	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	406	list_del_init(&bh->b_assoc_buffers);
	407	bh->b_private = NULL;
	408	brelse(bh);
	409	}
	410	return ret;
	411	}
	412
	413	static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
	414	struct nilfs_argv *argv,
415	int dir)
416	{
417	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
418	nilfs_ioctl_do_move_blocks);
419	}
420
421	static ssize_t
b028fcfc	422	nilfs_ioctl_do_delete_checkpoints(struct the_nilfs nilfs, __u64 posp,
7942b919 KS	423	int flags, void *buf, size_t size,
	424	size_t nmembs)
	425	{
	426	struct inode *cpfile = nilfs->ns_cpfile;
	427	struct nilfs_period *periods = buf;
	428	int ret, i;
	429
	430	for (i = 0; i < nmembs; i++) {
	431	ret = nilfs_cpfile_delete_checkpoints(
	432	cpfile, periods[i].p_start, periods[i].p_end);
	433	if (ret < 0)
	434	return ret;
	435	}
	436	return nmembs;
	437	}
	438
	439	static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
	440	struct nilfs_argv *argv,
	441	int dir)
	442	{
	443	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	444	nilfs_ioctl_do_delete_checkpoints);
	445	}
	446
	447	static ssize_t
b028fcfc	448	nilfs_ioctl_do_free_vblocknrs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	449	void *buf, size_t size, size_t nmembs)
	450	{
	451	int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
	452
	453	return (ret < 0) ? ret : nmembs;
	454	}
	455
	456	static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
	457	struct nilfs_argv *argv,
	458	int dir)
	459	{
	460	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	461	nilfs_ioctl_do_free_vblocknrs);
	462	}
	463
	464	static ssize_t
b028fcfc RK	465	nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs nilfs, __u64 posp,
	466	int flags, void *buf, size_t size,
	467	size_t nmembs)
7942b919 KS	468	{
	469	struct inode *dat = nilfs_dat_inode(nilfs);
	470	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	471	struct nilfs_bdesc *bdescs = buf;
	472	int ret, i;
	473
	474	for (i = 0; i < nmembs; i++) {
	475	/* XXX: use macro or inline func to check liveness */
	476	ret = nilfs_bmap_lookup_at_level(bmap,
	477	bdescs[i].bd_offset,
	478	bdescs[i].bd_level + 1,
	479	&bdescs[i].bd_blocknr);
	480	if (ret < 0) {
	481	if (ret != -ENOENT)
	482	return ret;
	483	bdescs[i].bd_blocknr = 0;
	484	}
	485	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	486	/* skip dead block */
	487	continue;
	488	if (bdescs[i].bd_level == 0) {
	489	ret = nilfs_mdt_mark_block_dirty(dat,
	490	bdescs[i].bd_offset);
	491	if (ret < 0) {
1f5abe7e	492	WARN_ON(ret == -ENOENT);
7942b919 KS	493	return ret;
	494	}
	495	} else {
	496	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	497	bdescs[i].bd_level);
	498	if (ret < 0) {
1f5abe7e	499	WARN_ON(ret == -ENOENT);
7942b919 KS	500	return ret;
	501	}
	502	}
	503	}
	504	return nmembs;
	505	}
	506
	507	static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
	508	struct nilfs_argv *argv,
	509	int dir)
	510	{
	511	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	512	nilfs_ioctl_do_mark_blocks_dirty);
	513	}
	514
	515	static ssize_t
b028fcfc	516	nilfs_ioctl_do_free_segments(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	517	void *buf, size_t size, size_t nmembs)
	518	{
	519	struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
	520	int ret;
	521
1f5abe7e RK	522	if (unlikely(!sbi))
1f5abe7e RK	523	return -EROFS;
7942b919 KS	524	ret = nilfs_segctor_add_segments_to_be_freed(
	525	NILFS_SC(sbi), buf, nmembs);
	526	nilfs_put_writer(nilfs);
	527
	528	return (ret < 0) ? ret : nmembs;
	529	}
	530
	531	static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
	532	struct nilfs_argv *argv,
	533	int dir)
	534	{
	535	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	536	nilfs_ioctl_do_free_segments);
	537	}
	538
	539	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
	540	void __user *argp)
	541	{
	542	struct nilfs_argv argv[5];
1f5abe7e	543	const char *msg;
7942b919 KS	544	int dir, ret;
	545
	546	if (copy_from_user(argv, argp, sizeof(argv)))
	547	return -EFAULT;
	548
	549	dir = _IOC_WRITE;
	550	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
1f5abe7e RK	551	if (ret < 0) {
	552	msg = "cannot read source blocks";
	553	goto failed;
	554	}
7942b919	555	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
1f5abe7e RK	556	if (ret < 0) {
	557	/*
	558	* can safely abort because checkpoints can be removed
	559	* independently.
	560	*/
	561	msg = "cannot delete checkpoints";
	562	goto failed;
	563	}
7942b919	564	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
1f5abe7e RK	565	if (ret < 0) {
	566	/*
	567	* can safely abort because DAT file is updated atomically
	568	* using a copy-on-write technique.
	569	*/
	570	msg = "cannot delete virtual blocks from DAT file";
	571	goto failed;
	572	}
7942b919	573	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
1f5abe7e RK	574	if (ret < 0) {
	575	/*
	576	* can safely abort because the operation is nondestructive.
	577	*/
	578	msg = "cannot mark copying blocks dirty";
	579	goto failed;
	580	}
7942b919	581	ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
1f5abe7e RK	582	if (ret < 0) {
	583	/*
	584	* can safely abort because this operation is atomic.
	585	*/
	586	msg = "cannot set segments to be freed";
	587	goto failed;
	588	}
7942b919 KS	589	return 0;
7942b919 KS	590
1f5abe7e	591	failed:
7942b919	592	nilfs_remove_all_gcinode(nilfs);
1f5abe7e RK	593	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	594	msg, ret);
7942b919 KS	595	return ret;
	596	}
	597
	598	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	599	unsigned int cmd, void __user *argp)
	600	{
7942b919 KS	601	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	602	return -EPERM;
1088dcf4	603	return nilfs_clean_segments(inode->i_sb, argp);
7942b919 KS	604	}
	605
	606	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	607	unsigned int cmd, void __user *argp)
	608	{
	609	__u64 cno;
	610	int ret;
	611
	612	ret = nilfs_construct_segment(inode->i_sb);
	613	if (ret < 0)
	614	return ret;
	615
	616	if (argp != NULL) {
	617	cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
	618	if (copy_to_user(argp, &cno, sizeof(cno)))
	619	return -EFAULT;
	620	}
	621	return 0;
	622	}
	623
7a946193	624	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	625	{
7a946193	626	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	627	void __user argp = (void __user *)arg;
	628
	629	switch (cmd) {
	630	case NILFS_IOCTL_CHANGE_CPMODE:
	631	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	632	case NILFS_IOCTL_DELETE_CHECKPOINT:
	633	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	634	case NILFS_IOCTL_GET_CPINFO:
	635	return nilfs_ioctl_get_cpinfo(inode, filp, cmd, argp);
	636	case NILFS_IOCTL_GET_CPSTAT:
	637	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	638	case NILFS_IOCTL_GET_SUINFO:
	639	return nilfs_ioctl_get_suinfo(inode, filp, cmd, argp);
	640	case NILFS_IOCTL_GET_SUSTAT:
	641	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	642	case NILFS_IOCTL_GET_VINFO:
	643	/* XXX: rename to ??? */
	644	return nilfs_ioctl_get_vinfo(inode, filp, cmd, argp);
	645	case NILFS_IOCTL_GET_BDESCS:
	646	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	647	case NILFS_IOCTL_CLEAN_SEGMENTS:
	648	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	649	case NILFS_IOCTL_SYNC:
	650	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	651	default:
	652	return -ENOTTY;
	653	}
	654	}