[deliverable/linux.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/vmalloc.h>
#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)
{
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
				      nmembs);
	up_read(&nilfs->ns_segctor_sem);
	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)
{
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
	up_read(&nilfs->ns_segctor_sem);
	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)
{
	int ret;

	down_read(&nilfs->ns_segctor_sem);
	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
	up_read(&nilfs->ns_segctor_sem);
	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;

	down_read(&nilfs->ns_segctor_sem);
	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) {
				up_read(&nilfs->ns_segctor_sem);
				return ret;
			}
			bdescs[i].bd_blocknr = 0;
		}
	}
	up_read(&nilfs->ns_segctor_sem);
	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;

	if (argv.v_size != sizeof(struct nilfs_bdesc))
		return -EINVAL;

	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
				    nilfs_ioctl_do_get_bdescs);
	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 int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
				   struct nilfs_argv *argv, void *buf)
{
	size_t nmembs = argv->v_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 int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
					  struct nilfs_argv *argv, void *buf)
{
	size_t nmembs = argv->v_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 int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
				      struct nilfs_argv *argv, void *buf)
{
	size_t nmembs = argv->v_nmembs;
	int ret;

	ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);

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

static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
					 struct nilfs_argv *argv, void *buf)
{
	size_t nmembs = argv->v_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 int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
				     struct nilfs_argv *argv, void *buf)
{
	size_t nmembs = argv->v_nmembs;
	struct nilfs_sb_info *sbi = nilfs->ns_writer;
	int ret;

	if (unlikely(!sbi)) {
		/* never happens because called for a writable mount */
		WARN_ON(1);
		return -EROFS;
	}
	ret = nilfs_segctor_add_segments_to_be_freed(
		NILFS_SC(sbi), buf, nmembs);

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

int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
				       struct nilfs_argv *argv, void **kbufs)
{
	const char *msg;
	int ret;

	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
	if (ret < 0) {
		msg = "cannot read source blocks";
		goto failed;
	}

	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
	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], kbufs[2]);
	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], kbufs[3]);
	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], kbufs[4]);
	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)
{
	struct nilfs_argv argv[5];
	const static size_t argsz[5] = {
		sizeof(struct nilfs_vdesc),
		sizeof(struct nilfs_period),
		sizeof(__u64),
		sizeof(struct nilfs_bdesc),
		sizeof(__u64),
	};
	void __user *base;
	void *kbufs[5];
	struct the_nilfs *nilfs;
	size_t len, nsegs;
	int n, ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

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

	nsegs = argv[4].v_nmembs;
	if (argv[4].v_size != argsz[4])
		return -EINVAL;
	/*
	 * argv[4] points to segment numbers this ioctl cleans.  We
	 * use kmalloc() for its buffer because memory used for the
	 * segment numbers is enough small.
	 */
	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
			       nsegs * sizeof(__u64));
	if (IS_ERR(kbufs[4]))
		return PTR_ERR(kbufs[4]);

	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;

	for (n = 0; n < 4; n++) {
		ret = -EINVAL;
		if (argv[n].v_size != argsz[n])
			goto out_free;

		if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
			goto out_free;

		len = argv[n].v_size * argv[n].v_nmembs;
		base = (void __user *)(unsigned long)argv[n].v_base;
		if (len == 0) {
			kbufs[n] = NULL;
			continue;
		}

		kbufs[n] = vmalloc(len);
		if (!kbufs[n]) {
			ret = -ENOMEM;
			goto out_free;
		}
		if (copy_from_user(kbufs[n], base, len)) {
			ret = -EFAULT;
			vfree(kbufs[n]);
			goto out_free;
		}
	}

	ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);

 out_free:
	while (--n > 0)
		vfree(kbufs[n]);
	kfree(kbufs[4]);
	return ret;
}

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;
}

static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
				unsigned int cmd, void __user *argp,
				size_t membsz,
				ssize_t (*dofunc)(struct the_nilfs *,
						  __u64 *, int,
						  void *, size_t, size_t))

{
	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;

	if (argv.v_size != membsz)
		return -EINVAL;

	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	if (ret < 0)
		return ret;

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

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_info(inode, filp, cmd, argp,
					    sizeof(struct nilfs_cpinfo),
					    nilfs_ioctl_do_get_cpinfo);
	case NILFS_IOCTL_GET_CPSTAT:
		return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_SUINFO:
		return nilfs_ioctl_get_info(inode, filp, cmd, argp,
					    sizeof(struct nilfs_suinfo),
					    nilfs_ioctl_do_get_suinfo);
	case NILFS_IOCTL_GET_SUSTAT:
		return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	case NILFS_IOCTL_GET_VINFO:
		return nilfs_ioctl_get_info(inode, filp, cmd, argp,
					    sizeof(struct nilfs_vinfo),
					    nilfs_ioctl_do_get_vinfo);
	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() */
4f6b8288	28	#include <linux/vmalloc.h>
7942b919 KS	29	#include <linux/nilfs2_fs.h>
	30	#include "nilfs.h"
	31	#include "segment.h"
	32	#include "bmap.h"
	33	#include "cpfile.h"
	34	#include "sufile.h"
	35	#include "dat.h"
	36
	37
7942b919 KS	38	static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
	39	struct nilfs_argv *argv, int dir,
	40	ssize_t (dofunc)(struct the_nilfs ,
b028fcfc	41	__u64 *, int,
7942b919 KS	42	void *, size_t, size_t))
	43	{
	44	void *buf;
dc498d09	45	void __user base = (void __user )(unsigned long)argv->v_base;
3358b4aa	46	size_t maxmembs, total, n;
7942b919 KS	47	ssize_t nr;
7942b919 KS	48	int ret, i;
b028fcfc	49	__u64 pos, ppos;
7942b919 KS	50
	51	if (argv->v_nmembs == 0)
	52	return 0;
	53
3358b4aa RK	54	if (argv->v_size > PAGE_SIZE)
	55	return -EINVAL;
	56
	57	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	58	if (unlikely(!buf))
7942b919	59	return -ENOMEM;
3358b4aa	60	maxmembs = PAGE_SIZE / argv->v_size;
7942b919 KS	61
	62	ret = 0;
	63	total = 0;
b028fcfc	64	pos = argv->v_index;
7942b919 KS	65	for (i = 0; i < argv->v_nmembs; i += n) {
	66	n = (argv->v_nmembs - i < maxmembs) ?
	67	argv->v_nmembs - i : maxmembs;
	68	if ((dir & _IOC_WRITE) &&
dc498d09 RK	69	copy_from_user(buf, base + argv->v_size * i,
dc498d09 RK	70	argv->v_size * n)) {
7942b919 KS	71	ret = -EFAULT;
	72	break;
	73	}
b028fcfc	74	ppos = pos;
8acfbf09	75	nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
b028fcfc	76	n);
7942b919 KS	77	if (nr < 0) {
	78	ret = nr;
	79	break;
	80	}
	81	if ((dir & _IOC_READ) &&
dc498d09 RK	82	copy_to_user(base + argv->v_size * i, buf,
dc498d09 RK	83	argv->v_size * nr)) {
7942b919 KS	84	ret = -EFAULT;
	85	break;
	86	}
	87	total += nr;
b028fcfc RK	88	if ((size_t)nr < n)
	89	break;
	90	if (pos == ppos)
	91	pos += n;
7942b919 KS	92	}
	93	argv->v_nmembs = total;
	94
3358b4aa	95	free_pages((unsigned long)buf, 0);
7942b919 KS	96	return ret;
	97	}
	98
	99	static int nilfs_ioctl_change_cpmode(struct inode inode, struct file filp,
	100	unsigned int cmd, void __user *argp)
	101	{
	102	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	103	struct nilfs_transaction_info ti;
	104	struct nilfs_cpmode cpmode;
	105	int ret;
	106
	107	if (!capable(CAP_SYS_ADMIN))
	108	return -EPERM;
	109	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
	110	return -EFAULT;
	111
	112	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	113	ret = nilfs_cpfile_change_cpmode(
	114	cpfile, cpmode.cm_cno, cpmode.cm_mode);
47420c79 RK	115	if (unlikely(ret < 0)) {
	116	nilfs_transaction_abort(inode->i_sb);
	117	return ret;
	118	}
	119	nilfs_transaction_commit(inode->i_sb); /* never fails */
7942b919 KS	120	return ret;
	121	}
	122
	123	static int
	124	nilfs_ioctl_delete_checkpoint(struct inode inode, struct file filp,
	125	unsigned int cmd, void __user *argp)
	126	{
	127	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	128	struct nilfs_transaction_info ti;
	129	__u64 cno;
	130	int ret;
	131
	132	if (!capable(CAP_SYS_ADMIN))
	133	return -EPERM;
	134	if (copy_from_user(&cno, argp, sizeof(cno)))
	135	return -EFAULT;
	136
	137	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	138	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
47420c79 RK	139	if (unlikely(ret < 0)) {
	140	nilfs_transaction_abort(inode->i_sb);
	141	return ret;
	142	}
	143	nilfs_transaction_commit(inode->i_sb); /* never fails */
7942b919 KS	144	return ret;
	145	}
	146
	147	static ssize_t
b028fcfc	148	nilfs_ioctl_do_get_cpinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	149	void *buf, size_t size, size_t nmembs)
7942b919 KS	150	{
7942b919 KS	151	int ret;
7942b919 KS	152
47420c79	153	down_read(&nilfs->ns_segctor_sem);
47eb6b9c RK	154	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
47eb6b9c RK	155	nmembs);
47420c79	156	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	157	return ret;
	158	}
	159
	160	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	161	unsigned int cmd, void __user *argp)
	162	{
47420c79	163	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	164	struct nilfs_cpstat cpstat;
7942b919 KS	165	int ret;
7942b919 KS	166
47420c79 RK	167	down_read(&nilfs->ns_segctor_sem);
	168	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	169	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	170	if (ret < 0)
	171	return ret;
	172
	173	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	174	ret = -EFAULT;
	175	return ret;
	176	}
	177
	178	static ssize_t
b028fcfc	179	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	180	void *buf, size_t size, size_t nmembs)
7942b919 KS	181	{
7942b919 KS	182	int ret;
7942b919 KS	183
47420c79	184	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	185	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
47420c79	186	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	187	return ret;
	188	}
	189
	190	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	191	unsigned int cmd, void __user *argp)
	192	{
47420c79	193	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	194	struct nilfs_sustat sustat;
7942b919 KS	195	int ret;
7942b919 KS	196
47420c79 RK	197	down_read(&nilfs->ns_segctor_sem);
	198	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	199	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	200	if (ret < 0)
	201	return ret;
	202
	203	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	204	ret = -EFAULT;
	205	return ret;
	206	}
	207
	208	static ssize_t
b028fcfc	209	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	210	void *buf, size_t size, size_t nmembs)
7942b919 KS	211	{
7942b919 KS	212	int ret;
7942b919 KS	213
47420c79	214	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	215	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
47420c79	216	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	217	return ret;
	218	}
	219
	220	static ssize_t
b028fcfc	221	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	222	void *buf, size_t size, size_t nmembs)
	223	{
	224	struct inode *dat = nilfs_dat_inode(nilfs);
	225	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	226	struct nilfs_bdesc *bdescs = buf;
	227	int ret, i;
	228
47eb6b9c	229	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	230	for (i = 0; i < nmembs; i++) {
	231	ret = nilfs_bmap_lookup_at_level(bmap,
	232	bdescs[i].bd_offset,
	233	bdescs[i].bd_level + 1,
	234	&bdescs[i].bd_blocknr);
	235	if (ret < 0) {
47eb6b9c RK	236	if (ret != -ENOENT) {
47eb6b9c RK	237	up_read(&nilfs->ns_segctor_sem);
7942b919	238	return ret;
47eb6b9c	239	}
7942b919 KS	240	bdescs[i].bd_blocknr = 0;
	241	}
	242	}
47eb6b9c	243	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	244	return nmembs;
	245	}
	246
	247	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	248	unsigned int cmd, void __user *argp)
	249	{
	250	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	251	struct nilfs_argv argv;
7942b919 KS	252	int ret;
	253
	254	if (copy_from_user(&argv, argp, sizeof(argv)))
	255	return -EFAULT;
	256
83aca8f4 RK	257	if (argv.v_size != sizeof(struct nilfs_bdesc))
	258	return -EINVAL;
	259
7942b919 KS	260	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	261	nilfs_ioctl_do_get_bdescs);
47420c79 RK	262	if (ret < 0)
47420c79 RK	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 int nilfs_ioctl_move_inode_block(struct inode *inode,
	271	struct nilfs_vdesc *vdesc,
	272	struct list_head *buffers)
	273	{
	274	struct buffer_head *bh;
	275	int ret;
	276
	277	if (vdesc->vd_flags == 0)
	278	ret = nilfs_gccache_submit_read_data(
	279	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	280	vdesc->vd_vblocknr, &bh);
	281	else
	282	ret = nilfs_gccache_submit_read_node(
	283	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	284
	285	if (unlikely(ret < 0)) {
	286	if (ret == -ENOENT)
	287	printk(KERN_CRIT
	288	"%s: invalid virtual block address (%s): "
	289	"ino=%llu, cno=%llu, offset=%llu, "
	290	"blocknr=%llu, vblocknr=%llu\n",
	291	__func__, vdesc->vd_flags ? "node" : "data",
	292	(unsigned long long)vdesc->vd_ino,
	293	(unsigned long long)vdesc->vd_cno,
	294	(unsigned long long)vdesc->vd_offset,
	295	(unsigned long long)vdesc->vd_blocknr,
	296	(unsigned long long)vdesc->vd_vblocknr);
	297	return ret;
	298	}
	299	bh->b_private = vdesc;
	300	list_add_tail(&bh->b_assoc_buffers, buffers);
	301	return 0;
	302	}
	303
4f6b8288 RK	304	static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
4f6b8288 RK	305	struct nilfs_argv argv, void buf)
7942b919	306	{
4f6b8288	307	size_t nmembs = argv->v_nmembs;
7942b919 KS	308	struct inode *inode;
	309	struct nilfs_vdesc *vdesc;
	310	struct buffer_head bh, n;
	311	LIST_HEAD(buffers);
	312	ino_t ino;
	313	__u64 cno;
	314	int i, ret;
	315
	316	for (i = 0, vdesc = buf; i < nmembs; ) {
	317	ino = vdesc->vd_ino;
	318	cno = vdesc->vd_cno;
	319	inode = nilfs_gc_iget(nilfs, ino, cno);
	320	if (unlikely(inode == NULL)) {
	321	ret = -ENOMEM;
	322	goto failed;
	323	}
	324	do {
	325	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	326	&buffers);
	327	if (unlikely(ret < 0))
	328	goto failed;
	329	vdesc++;
	330	} while (++i < nmembs &&
	331	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	332	}
	333
	334	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	335	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	336	if (unlikely(ret < 0)) {
	337	if (ret == -EEXIST) {
	338	vdesc = bh->b_private;
	339	printk(KERN_CRIT
	340	"%s: conflicting %s buffer: "
	341	"ino=%llu, cno=%llu, offset=%llu, "
	342	"blocknr=%llu, vblocknr=%llu\n",
	343	__func__,
	344	vdesc->vd_flags ? "node" : "data",
	345	(unsigned long long)vdesc->vd_ino,
	346	(unsigned long long)vdesc->vd_cno,
	347	(unsigned long long)vdesc->vd_offset,
	348	(unsigned long long)vdesc->vd_blocknr,
	349	(unsigned long long)vdesc->vd_vblocknr);
	350	}
	351	goto failed;
	352	}
	353	list_del_init(&bh->b_assoc_buffers);
	354	bh->b_private = NULL;
	355	brelse(bh);
	356	}
	357	return nmembs;
	358
	359	failed:
	360	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	361	list_del_init(&bh->b_assoc_buffers);
	362	bh->b_private = NULL;
	363	brelse(bh);
	364	}
	365	return ret;
	366	}
	367
4f6b8288 RK	368	static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
4f6b8288 RK	369	struct nilfs_argv argv, void buf)
7942b919	370	{
4f6b8288	371	size_t nmembs = argv->v_nmembs;
7942b919 KS	372	struct inode *cpfile = nilfs->ns_cpfile;
	373	struct nilfs_period *periods = buf;
	374	int ret, i;
	375
	376	for (i = 0; i < nmembs; i++) {
	377	ret = nilfs_cpfile_delete_checkpoints(
	378	cpfile, periods[i].p_start, periods[i].p_end);
	379	if (ret < 0)
	380	return ret;
	381	}
	382	return nmembs;
	383	}
	384
4f6b8288 RK	385	static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
4f6b8288 RK	386	struct nilfs_argv argv, void buf)
7942b919	387	{
4f6b8288 RK	388	size_t nmembs = argv->v_nmembs;
4f6b8288 RK	389	int ret;
7942b919	390
4f6b8288	391	ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
7942b919 KS	392
	393	return (ret < 0) ? ret : nmembs;
	394	}
	395
4f6b8288 RK	396	static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
4f6b8288 RK	397	struct nilfs_argv argv, void buf)
7942b919	398	{
4f6b8288	399	size_t nmembs = argv->v_nmembs;
7942b919 KS	400	struct inode *dat = nilfs_dat_inode(nilfs);
	401	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	402	struct nilfs_bdesc *bdescs = buf;
	403	int ret, i;
	404
	405	for (i = 0; i < nmembs; i++) {
	406	/* XXX: use macro or inline func to check liveness */
	407	ret = nilfs_bmap_lookup_at_level(bmap,
	408	bdescs[i].bd_offset,
	409	bdescs[i].bd_level + 1,
	410	&bdescs[i].bd_blocknr);
	411	if (ret < 0) {
	412	if (ret != -ENOENT)
	413	return ret;
	414	bdescs[i].bd_blocknr = 0;
	415	}
	416	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	417	/* skip dead block */
	418	continue;
	419	if (bdescs[i].bd_level == 0) {
	420	ret = nilfs_mdt_mark_block_dirty(dat,
	421	bdescs[i].bd_offset);
	422	if (ret < 0) {
1f5abe7e	423	WARN_ON(ret == -ENOENT);
7942b919 KS	424	return ret;
	425	}
	426	} else {
	427	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	428	bdescs[i].bd_level);
	429	if (ret < 0) {
1f5abe7e	430	WARN_ON(ret == -ENOENT);
7942b919 KS	431	return ret;
	432	}
	433	}
	434	}
	435	return nmembs;
	436	}
	437
4f6b8288 RK	438	static int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
4f6b8288 RK	439	struct nilfs_argv argv, void buf)
7942b919	440	{
4f6b8288	441	size_t nmembs = argv->v_nmembs;
201913ed	442	struct nilfs_sb_info *sbi = nilfs->ns_writer;
7942b919 KS	443	int ret;
7942b919 KS	444
201913ed RK	445	if (unlikely(!sbi)) {
	446	/* never happens because called for a writable mount */
	447	WARN_ON(1);
1f5abe7e	448	return -EROFS;
201913ed	449	}
7942b919 KS	450	ret = nilfs_segctor_add_segments_to_be_freed(
7942b919 KS	451	NILFS_SC(sbi), buf, nmembs);
7942b919 KS	452
	453	return (ret < 0) ? ret : nmembs;
	454	}
	455
7942b919	456	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
4f6b8288	457	struct nilfs_argv argv, void *kbufs)
7942b919	458	{
1f5abe7e	459	const char *msg;
4f6b8288	460	int ret;
7942b919	461
4f6b8288	462	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
1f5abe7e RK	463	if (ret < 0) {
	464	msg = "cannot read source blocks";
	465	goto failed;
	466	}
4f6b8288 RK	467
4f6b8288 RK	468	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
1f5abe7e RK	469	if (ret < 0) {
	470	/*
	471	* can safely abort because checkpoints can be removed
	472	* independently.
	473	*/
	474	msg = "cannot delete checkpoints";
	475	goto failed;
	476	}
4f6b8288	477	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
1f5abe7e RK	478	if (ret < 0) {
	479	/*
	480	* can safely abort because DAT file is updated atomically
	481	* using a copy-on-write technique.
	482	*/
	483	msg = "cannot delete virtual blocks from DAT file";
	484	goto failed;
	485	}
4f6b8288	486	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
1f5abe7e RK	487	if (ret < 0) {
	488	/*
	489	* can safely abort because the operation is nondestructive.
	490	*/
	491	msg = "cannot mark copying blocks dirty";
	492	goto failed;
	493	}
4f6b8288	494	ret = nilfs_ioctl_free_segments(nilfs, &argv[4], kbufs[4]);
1f5abe7e RK	495	if (ret < 0) {
	496	/*
	497	* can safely abort because this operation is atomic.
	498	*/
	499	msg = "cannot set segments to be freed";
	500	goto failed;
	501	}
7942b919 KS	502	return 0;
7942b919 KS	503
1f5abe7e	504	failed:
7942b919	505	nilfs_remove_all_gcinode(nilfs);
1f5abe7e RK	506	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	507	msg, ret);
7942b919 KS	508	return ret;
	509	}
	510
	511	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	512	unsigned int cmd, void __user *argp)
	513	{
4f6b8288 RK	514	struct nilfs_argv argv[5];
	515	const static size_t argsz[5] = {
	516	sizeof(struct nilfs_vdesc),
	517	sizeof(struct nilfs_period),
	518	sizeof(__u64),
	519	sizeof(struct nilfs_bdesc),
	520	sizeof(__u64),
	521	};
	522	void __user *base;
	523	void *kbufs[5];
	524	struct the_nilfs *nilfs;
	525	size_t len, nsegs;
	526	int n, ret;
	527
7942b919 KS	528	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	529	return -EPERM;
4f6b8288 RK	530
	531	if (copy_from_user(argv, argp, sizeof(argv)))
	532	return -EFAULT;
	533
	534	nsegs = argv[4].v_nmembs;
	535	if (argv[4].v_size != argsz[4])
	536	return -EINVAL;
	537	/*
	538	* argv[4] points to segment numbers this ioctl cleans. We
	539	* use kmalloc() for its buffer because memory used for the
	540	* segment numbers is enough small.
	541	*/
	542	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
	543	nsegs * sizeof(__u64));
	544	if (IS_ERR(kbufs[4]))
	545	return PTR_ERR(kbufs[4]);
	546
	547	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	548
	549	for (n = 0; n < 4; n++) {
	550	ret = -EINVAL;
	551	if (argv[n].v_size != argsz[n])
	552	goto out_free;
	553
	554	if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
	555	goto out_free;
	556
	557	len = argv[n].v_size * argv[n].v_nmembs;
	558	base = (void __user *)(unsigned long)argv[n].v_base;
	559	if (len == 0) {
	560	kbufs[n] = NULL;
	561	continue;
	562	}
	563
	564	kbufs[n] = vmalloc(len);
	565	if (!kbufs[n]) {
	566	ret = -ENOMEM;
	567	goto out_free;
	568	}
	569	if (copy_from_user(kbufs[n], base, len)) {
	570	ret = -EFAULT;
	571	vfree(kbufs[n]);
	572	goto out_free;
	573	}
	574	}
	575
	576	ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
	577
	578	out_free:
	579	while (--n > 0)
	580	vfree(kbufs[n]);
	581	kfree(kbufs[4]);
	582	return ret;
7942b919 KS	583	}
	584
	585	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	586	unsigned int cmd, void __user *argp)
	587	{
	588	__u64 cno;
	589	int ret;
	590
	591	ret = nilfs_construct_segment(inode->i_sb);
	592	if (ret < 0)
	593	return ret;
	594
	595	if (argp != NULL) {
	596	cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
	597	if (copy_to_user(argp, &cno, sizeof(cno)))
	598	return -EFAULT;
	599	}
	600	return 0;
	601	}
	602
47eb6b9c RK	603	static int nilfs_ioctl_get_info(struct inode inode, struct file filp,
47eb6b9c RK	604	unsigned int cmd, void __user *argp,
83aca8f4	605	size_t membsz,
47eb6b9c RK	606	ssize_t (dofunc)(struct the_nilfs ,
	607	__u64 *, int,
	608	void *, size_t, size_t))
	609
	610	{
	611	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	612	struct nilfs_argv argv;
	613	int ret;
	614
	615	if (copy_from_user(&argv, argp, sizeof(argv)))
	616	return -EFAULT;
	617
83aca8f4 RK	618	if (argv.v_size != membsz)
	619	return -EINVAL;
	620
47eb6b9c RK	621	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	622	if (ret < 0)
	623	return ret;
	624
	625	if (copy_to_user(argp, &argv, sizeof(argv)))
	626	ret = -EFAULT;
	627	return ret;
	628	}
	629
7a946193	630	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	631	{
7a946193	632	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	633	void __user argp = (void __user *)arg;
	634
	635	switch (cmd) {
	636	case NILFS_IOCTL_CHANGE_CPMODE:
	637	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	638	case NILFS_IOCTL_DELETE_CHECKPOINT:
	639	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	640	case NILFS_IOCTL_GET_CPINFO:
47eb6b9c	641	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	642	sizeof(struct nilfs_cpinfo),
47eb6b9c	643	nilfs_ioctl_do_get_cpinfo);
7942b919 KS	644	case NILFS_IOCTL_GET_CPSTAT:
	645	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	646	case NILFS_IOCTL_GET_SUINFO:
47eb6b9c	647	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	648	sizeof(struct nilfs_suinfo),
47eb6b9c	649	nilfs_ioctl_do_get_suinfo);
7942b919 KS	650	case NILFS_IOCTL_GET_SUSTAT:
	651	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	652	case NILFS_IOCTL_GET_VINFO:
47eb6b9c	653	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	654	sizeof(struct nilfs_vinfo),
47eb6b9c	655	nilfs_ioctl_do_get_vinfo);
7942b919 KS	656	case NILFS_IOCTL_GET_BDESCS:
	657	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	658	case NILFS_IOCTL_CLEAN_SEGMENTS:
	659	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	660	case NILFS_IOCTL_SYNC:
	661	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	662	default:
	663	return -ENOTTY;
	664	}
	665	}