[net-next-2.6.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 the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	struct inode *cpfile = 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;

	mutex_lock(&nilfs->ns_mount_mutex);
	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);
		mutex_unlock(&nilfs->ns_mount_mutex);
		return ret;
	}
	nilfs_transaction_commit(inode->i_sb); /* never fails */
	mutex_unlock(&nilfs->ns_mount_mutex);
	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,
				      size, 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, size,
				      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, size, 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;
	}
	if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
		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);
		brelse(bh);
		return -EEXIST;
	}
	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)) {
			WARN_ON(ret == -EEXIST);
			goto failed;
		}
		list_del_init(&bh->b_assoc_buffers);
		brelse(bh);
	}
	return nmembs;

 failed:
	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
		list_del_init(&bh->b_assoc_buffers);
		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;
}

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

	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;
	}
	return 0;

 failed:
	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;
		}
	}

	/*
	 * nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
	 * which will operates an inode list without blocking.
	 * To protect the list from concurrent operations,
	 * nilfs_ioctl_move_blocks should be atomic operation.
	 */
	if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
		ret = -EBUSY;
		goto out_free;
	}

	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
	if (ret < 0)
		printk(KERN_ERR "NILFS: GC failed during preparation: "
			"cannot read source blocks: err=%d\n", ret);
	else
		ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);

	if (ret < 0)
		nilfs_remove_all_gcinode(nilfs);
	clear_nilfs_gc_running(nilfs);

 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	{
c1ea985c RK	102	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
c1ea985c RK	103	struct inode *cpfile = nilfs->ns_cpfile;
7942b919 KS	104	struct nilfs_transaction_info ti;
	105	struct nilfs_cpmode cpmode;
	106	int ret;
	107
	108	if (!capable(CAP_SYS_ADMIN))
	109	return -EPERM;
	110	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
	111	return -EFAULT;
	112
c1ea985c	113	mutex_lock(&nilfs->ns_mount_mutex);
7942b919 KS	114	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	115	ret = nilfs_cpfile_change_cpmode(
	116	cpfile, cpmode.cm_cno, cpmode.cm_mode);
47420c79 RK	117	if (unlikely(ret < 0)) {
47420c79 RK	118	nilfs_transaction_abort(inode->i_sb);
c1ea985c	119	mutex_unlock(&nilfs->ns_mount_mutex);
47420c79 RK	120	return ret;
	121	}
	122	nilfs_transaction_commit(inode->i_sb); /* never fails */
c1ea985c	123	mutex_unlock(&nilfs->ns_mount_mutex);
7942b919 KS	124	return ret;
	125	}
	126
	127	static int
	128	nilfs_ioctl_delete_checkpoint(struct inode inode, struct file filp,
	129	unsigned int cmd, void __user *argp)
	130	{
	131	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	132	struct nilfs_transaction_info ti;
	133	__u64 cno;
	134	int ret;
	135
	136	if (!capable(CAP_SYS_ADMIN))
	137	return -EPERM;
	138	if (copy_from_user(&cno, argp, sizeof(cno)))
	139	return -EFAULT;
	140
	141	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	142	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
47420c79 RK	143	if (unlikely(ret < 0)) {
	144	nilfs_transaction_abort(inode->i_sb);
	145	return ret;
	146	}
	147	nilfs_transaction_commit(inode->i_sb); /* never fails */
7942b919 KS	148	return ret;
	149	}
	150
	151	static ssize_t
b028fcfc	152	nilfs_ioctl_do_get_cpinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	153	void *buf, size_t size, size_t nmembs)
7942b919 KS	154	{
7942b919 KS	155	int ret;
7942b919 KS	156
47420c79	157	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	158	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
003ff182	159	size, nmembs);
47420c79	160	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	161	return ret;
	162	}
	163
	164	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	165	unsigned int cmd, void __user *argp)
	166	{
47420c79	167	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	168	struct nilfs_cpstat cpstat;
7942b919 KS	169	int ret;
7942b919 KS	170
47420c79 RK	171	down_read(&nilfs->ns_segctor_sem);
	172	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	173	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	174	if (ret < 0)
	175	return ret;
	176
	177	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	178	ret = -EFAULT;
	179	return ret;
	180	}
	181
	182	static ssize_t
b028fcfc	183	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	184	void *buf, size_t size, size_t nmembs)
7942b919 KS	185	{
7942b919 KS	186	int ret;
7942b919 KS	187
47420c79	188	down_read(&nilfs->ns_segctor_sem);
003ff182 RK	189	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
003ff182 RK	190	nmembs);
47420c79	191	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	192	return ret;
	193	}
	194
	195	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	196	unsigned int cmd, void __user *argp)
	197	{
47420c79	198	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	199	struct nilfs_sustat sustat;
7942b919 KS	200	int ret;
7942b919 KS	201
47420c79 RK	202	down_read(&nilfs->ns_segctor_sem);
	203	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	204	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	205	if (ret < 0)
	206	return ret;
	207
	208	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	209	ret = -EFAULT;
	210	return ret;
	211	}
	212
	213	static ssize_t
b028fcfc	214	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	215	void *buf, size_t size, size_t nmembs)
7942b919 KS	216	{
7942b919 KS	217	int ret;
7942b919 KS	218
47420c79	219	down_read(&nilfs->ns_segctor_sem);
003ff182	220	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
47420c79	221	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	222	return ret;
	223	}
	224
	225	static ssize_t
b028fcfc	226	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	227	void *buf, size_t size, size_t nmembs)
	228	{
	229	struct inode *dat = nilfs_dat_inode(nilfs);
	230	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	231	struct nilfs_bdesc *bdescs = buf;
	232	int ret, i;
	233
47eb6b9c	234	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	235	for (i = 0; i < nmembs; i++) {
	236	ret = nilfs_bmap_lookup_at_level(bmap,
	237	bdescs[i].bd_offset,
	238	bdescs[i].bd_level + 1,
	239	&bdescs[i].bd_blocknr);
	240	if (ret < 0) {
47eb6b9c RK	241	if (ret != -ENOENT) {
47eb6b9c RK	242	up_read(&nilfs->ns_segctor_sem);
7942b919	243	return ret;
47eb6b9c	244	}
7942b919 KS	245	bdescs[i].bd_blocknr = 0;
	246	}
	247	}
47eb6b9c	248	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	249	return nmembs;
	250	}
	251
	252	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	253	unsigned int cmd, void __user *argp)
	254	{
	255	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	256	struct nilfs_argv argv;
7942b919 KS	257	int ret;
	258
	259	if (copy_from_user(&argv, argp, sizeof(argv)))
	260	return -EFAULT;
	261
83aca8f4 RK	262	if (argv.v_size != sizeof(struct nilfs_bdesc))
	263	return -EINVAL;
	264
7942b919 KS	265	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	266	nilfs_ioctl_do_get_bdescs);
47420c79 RK	267	if (ret < 0)
47420c79 RK	268	return ret;
7942b919 KS	269
	270	if (copy_to_user(argp, &argv, sizeof(argv)))
	271	ret = -EFAULT;
	272	return ret;
	273	}
	274
	275	static int nilfs_ioctl_move_inode_block(struct inode *inode,
	276	struct nilfs_vdesc *vdesc,
	277	struct list_head *buffers)
	278	{
	279	struct buffer_head *bh;
	280	int ret;
	281
	282	if (vdesc->vd_flags == 0)
	283	ret = nilfs_gccache_submit_read_data(
	284	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	285	vdesc->vd_vblocknr, &bh);
	286	else
	287	ret = nilfs_gccache_submit_read_node(
	288	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	289
	290	if (unlikely(ret < 0)) {
	291	if (ret == -ENOENT)
	292	printk(KERN_CRIT
	293	"%s: invalid virtual block address (%s): "
	294	"ino=%llu, cno=%llu, offset=%llu, "
	295	"blocknr=%llu, vblocknr=%llu\n",
	296	__func__, vdesc->vd_flags ? "node" : "data",
	297	(unsigned long long)vdesc->vd_ino,
	298	(unsigned long long)vdesc->vd_cno,
	299	(unsigned long long)vdesc->vd_offset,
	300	(unsigned long long)vdesc->vd_blocknr,
	301	(unsigned long long)vdesc->vd_vblocknr);
	302	return ret;
	303	}
5399dd1f RK	304	if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
	305	printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
	306	"cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
	307	__func__, vdesc->vd_flags ? "node" : "data",
	308	(unsigned long long)vdesc->vd_ino,
	309	(unsigned long long)vdesc->vd_cno,
	310	(unsigned long long)vdesc->vd_offset,
	311	(unsigned long long)vdesc->vd_blocknr,
	312	(unsigned long long)vdesc->vd_vblocknr);
	313	brelse(bh);
	314	return -EEXIST;
	315	}
7942b919 KS	316	list_add_tail(&bh->b_assoc_buffers, buffers);
	317	return 0;
	318	}
	319
4f6b8288 RK	320	static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
4f6b8288 RK	321	struct nilfs_argv argv, void buf)
7942b919	322	{
4f6b8288	323	size_t nmembs = argv->v_nmembs;
7942b919 KS	324	struct inode *inode;
	325	struct nilfs_vdesc *vdesc;
	326	struct buffer_head bh, n;
	327	LIST_HEAD(buffers);
	328	ino_t ino;
	329	__u64 cno;
	330	int i, ret;
	331
	332	for (i = 0, vdesc = buf; i < nmembs; ) {
	333	ino = vdesc->vd_ino;
	334	cno = vdesc->vd_cno;
	335	inode = nilfs_gc_iget(nilfs, ino, cno);
	336	if (unlikely(inode == NULL)) {
	337	ret = -ENOMEM;
	338	goto failed;
	339	}
	340	do {
	341	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	342	&buffers);
	343	if (unlikely(ret < 0))
	344	goto failed;
	345	vdesc++;
	346	} while (++i < nmembs &&
	347	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	348	}
	349
	350	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	351	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	352	if (unlikely(ret < 0)) {
5399dd1f	353	WARN_ON(ret == -EEXIST);
7942b919 KS	354	goto failed;
	355	}
	356	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	357	brelse(bh);
	358	}
	359	return nmembs;
	360
	361	failed:
	362	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	363	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	364	brelse(bh);
	365	}
	366	return ret;
	367	}
	368
4f6b8288 RK	369	static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
4f6b8288 RK	370	struct nilfs_argv argv, void buf)
7942b919	371	{
4f6b8288	372	size_t nmembs = argv->v_nmembs;
7942b919 KS	373	struct inode *cpfile = nilfs->ns_cpfile;
	374	struct nilfs_period *periods = buf;
	375	int ret, i;
	376
	377	for (i = 0; i < nmembs; i++) {
	378	ret = nilfs_cpfile_delete_checkpoints(
	379	cpfile, periods[i].p_start, periods[i].p_end);
	380	if (ret < 0)
	381	return ret;
	382	}
	383	return nmembs;
	384	}
	385
4f6b8288 RK	386	static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
4f6b8288 RK	387	struct nilfs_argv argv, void buf)
7942b919	388	{
4f6b8288 RK	389	size_t nmembs = argv->v_nmembs;
4f6b8288 RK	390	int ret;
7942b919	391
4f6b8288	392	ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
7942b919 KS	393
	394	return (ret < 0) ? ret : nmembs;
	395	}
	396
4f6b8288 RK	397	static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
4f6b8288 RK	398	struct nilfs_argv argv, void buf)
7942b919	399	{
4f6b8288	400	size_t nmembs = argv->v_nmembs;
7942b919 KS	401	struct inode *dat = nilfs_dat_inode(nilfs);
	402	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	403	struct nilfs_bdesc *bdescs = buf;
	404	int ret, i;
	405
	406	for (i = 0; i < nmembs; i++) {
	407	/* XXX: use macro or inline func to check liveness */
	408	ret = nilfs_bmap_lookup_at_level(bmap,
	409	bdescs[i].bd_offset,
	410	bdescs[i].bd_level + 1,
	411	&bdescs[i].bd_blocknr);
	412	if (ret < 0) {
	413	if (ret != -ENOENT)
	414	return ret;
	415	bdescs[i].bd_blocknr = 0;
	416	}
	417	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	418	/* skip dead block */
	419	continue;
	420	if (bdescs[i].bd_level == 0) {
	421	ret = nilfs_mdt_mark_block_dirty(dat,
	422	bdescs[i].bd_offset);
	423	if (ret < 0) {
1f5abe7e	424	WARN_ON(ret == -ENOENT);
7942b919 KS	425	return ret;
	426	}
	427	} else {
	428	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	429	bdescs[i].bd_level);
	430	if (ret < 0) {
1f5abe7e	431	WARN_ON(ret == -ENOENT);
7942b919 KS	432	return ret;
	433	}
	434	}
	435	}
	436	return nmembs;
	437	}
	438
7942b919	439	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
4f6b8288	440	struct nilfs_argv argv, void *kbufs)
7942b919	441	{
1f5abe7e	442	const char *msg;
4f6b8288	443	int ret;
7942b919	444
4f6b8288	445	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
1f5abe7e RK	446	if (ret < 0) {
	447	/*
	448	* can safely abort because checkpoints can be removed
	449	* independently.
	450	*/
	451	msg = "cannot delete checkpoints";
	452	goto failed;
	453	}
4f6b8288	454	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
1f5abe7e RK	455	if (ret < 0) {
	456	/*
	457	* can safely abort because DAT file is updated atomically
	458	* using a copy-on-write technique.
	459	*/
	460	msg = "cannot delete virtual blocks from DAT file";
	461	goto failed;
	462	}
4f6b8288	463	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
1f5abe7e RK	464	if (ret < 0) {
	465	/*
	466	* can safely abort because the operation is nondestructive.
	467	*/
	468	msg = "cannot mark copying blocks dirty";
	469	goto failed;
	470	}
7942b919 KS	471	return 0;
7942b919 KS	472
1f5abe7e	473	failed:
1f5abe7e RK	474	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	475	msg, ret);
7942b919 KS	476	return ret;
	477	}
	478
	479	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	480	unsigned int cmd, void __user *argp)
	481	{
4f6b8288 RK	482	struct nilfs_argv argv[5];
	483	const static size_t argsz[5] = {
	484	sizeof(struct nilfs_vdesc),
	485	sizeof(struct nilfs_period),
	486	sizeof(__u64),
	487	sizeof(struct nilfs_bdesc),
	488	sizeof(__u64),
	489	};
	490	void __user *base;
	491	void *kbufs[5];
	492	struct the_nilfs *nilfs;
	493	size_t len, nsegs;
	494	int n, ret;
	495
7942b919 KS	496	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	497	return -EPERM;
4f6b8288 RK	498
	499	if (copy_from_user(argv, argp, sizeof(argv)))
	500	return -EFAULT;
	501
	502	nsegs = argv[4].v_nmembs;
	503	if (argv[4].v_size != argsz[4])
	504	return -EINVAL;
	505	/*
	506	* argv[4] points to segment numbers this ioctl cleans. We
	507	* use kmalloc() for its buffer because memory used for the
	508	* segment numbers is enough small.
	509	*/
	510	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
	511	nsegs * sizeof(__u64));
	512	if (IS_ERR(kbufs[4]))
	513	return PTR_ERR(kbufs[4]);
	514
	515	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	516
	517	for (n = 0; n < 4; n++) {
	518	ret = -EINVAL;
	519	if (argv[n].v_size != argsz[n])
	520	goto out_free;
	521
	522	if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
	523	goto out_free;
	524
	525	len = argv[n].v_size * argv[n].v_nmembs;
	526	base = (void __user *)(unsigned long)argv[n].v_base;
	527	if (len == 0) {
	528	kbufs[n] = NULL;
	529	continue;
	530	}
	531
	532	kbufs[n] = vmalloc(len);
	533	if (!kbufs[n]) {
	534	ret = -ENOMEM;
	535	goto out_free;
	536	}
	537	if (copy_from_user(kbufs[n], base, len)) {
	538	ret = -EFAULT;
	539	vfree(kbufs[n]);
	540	goto out_free;
	541	}
	542	}
	543
1cf58fa8 JS	544	/*
	545	* nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
	546	* which will operates an inode list without blocking.
	547	* To protect the list from concurrent operations,
	548	* nilfs_ioctl_move_blocks should be atomic operation.
	549	*/
	550	if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
	551	ret = -EBUSY;
	552	goto out_free;
	553	}
	554
	555	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
	556	if (ret < 0)
	557	printk(KERN_ERR "NILFS: GC failed during preparation: "
	558	"cannot read source blocks: err=%d\n", ret);
	559	else
	560	ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
	561
c083234f RK	562	if (ret < 0)
c083234f RK	563	nilfs_remove_all_gcinode(nilfs);
1cf58fa8	564	clear_nilfs_gc_running(nilfs);
4f6b8288 RK	565
4f6b8288 RK	566	out_free:
d5046853	567	while (--n >= 0)
4f6b8288 RK	568	vfree(kbufs[n]);
	569	kfree(kbufs[4]);
	570	return ret;
7942b919 KS	571	}
	572
	573	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	574	unsigned int cmd, void __user *argp)
	575	{
	576	__u64 cno;
	577	int ret;
	578
	579	ret = nilfs_construct_segment(inode->i_sb);
	580	if (ret < 0)
	581	return ret;
	582
	583	if (argp != NULL) {
	584	cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
	585	if (copy_to_user(argp, &cno, sizeof(cno)))
	586	return -EFAULT;
	587	}
	588	return 0;
	589	}
	590
47eb6b9c RK	591	static int nilfs_ioctl_get_info(struct inode inode, struct file filp,
47eb6b9c RK	592	unsigned int cmd, void __user *argp,
83aca8f4	593	size_t membsz,
47eb6b9c RK	594	ssize_t (dofunc)(struct the_nilfs ,
	595	__u64 *, int,
	596	void *, size_t, size_t))
	597
	598	{
	599	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	600	struct nilfs_argv argv;
	601	int ret;
	602
	603	if (copy_from_user(&argv, argp, sizeof(argv)))
	604	return -EFAULT;
	605
003ff182	606	if (argv.v_size < membsz)
83aca8f4 RK	607	return -EINVAL;
83aca8f4 RK	608
47eb6b9c RK	609	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	610	if (ret < 0)
	611	return ret;
	612
	613	if (copy_to_user(argp, &argv, sizeof(argv)))
	614	ret = -EFAULT;
	615	return ret;
	616	}
	617
7a946193	618	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	619	{
7a946193	620	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	621	void __user argp = (void __user *)arg;
	622
	623	switch (cmd) {
	624	case NILFS_IOCTL_CHANGE_CPMODE:
	625	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	626	case NILFS_IOCTL_DELETE_CHECKPOINT:
	627	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	628	case NILFS_IOCTL_GET_CPINFO:
47eb6b9c	629	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	630	sizeof(struct nilfs_cpinfo),
47eb6b9c	631	nilfs_ioctl_do_get_cpinfo);
7942b919 KS	632	case NILFS_IOCTL_GET_CPSTAT:
	633	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	634	case NILFS_IOCTL_GET_SUINFO:
47eb6b9c	635	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	636	sizeof(struct nilfs_suinfo),
47eb6b9c	637	nilfs_ioctl_do_get_suinfo);
7942b919 KS	638	case NILFS_IOCTL_GET_SUSTAT:
	639	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	640	case NILFS_IOCTL_GET_VINFO:
47eb6b9c	641	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	642	sizeof(struct nilfs_vinfo),
47eb6b9c	643	nilfs_ioctl_do_get_vinfo);
7942b919 KS	644	case NILFS_IOCTL_GET_BDESCS:
	645	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	646	case NILFS_IOCTL_CLEAN_SEGMENTS:
	647	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	648	case NILFS_IOCTL_SYNC:
	649	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	650	default:
	651	return -ENOTTY;
	652	}
	653	}