[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/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;

	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 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->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;
}

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;
}

static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
				unsigned int cmd, void __user *argp,
				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;

	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,
					    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,
					    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,
					    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() */
	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	{
7942b919 KS	150	int ret;
7942b919 KS	151
47420c79	152	down_read(&nilfs->ns_segctor_sem);
47eb6b9c RK	153	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
47eb6b9c RK	154	nmembs);
47420c79	155	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	156	return ret;
	157	}
	158
	159	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	160	unsigned int cmd, void __user *argp)
	161	{
47420c79	162	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	163	struct nilfs_cpstat cpstat;
7942b919 KS	164	int ret;
7942b919 KS	165
47420c79 RK	166	down_read(&nilfs->ns_segctor_sem);
	167	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	168	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	169	if (ret < 0)
	170	return ret;
	171
	172	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	173	ret = -EFAULT;
	174	return ret;
	175	}
	176
	177	static ssize_t
b028fcfc	178	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	179	void *buf, size_t size, size_t nmembs)
7942b919 KS	180	{
7942b919 KS	181	int ret;
7942b919 KS	182
47420c79	183	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	184	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
47420c79	185	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	186	return ret;
	187	}
	188
	189	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	190	unsigned int cmd, void __user *argp)
	191	{
47420c79	192	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	193	struct nilfs_sustat sustat;
7942b919 KS	194	int ret;
7942b919 KS	195
47420c79 RK	196	down_read(&nilfs->ns_segctor_sem);
	197	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	198	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	199	if (ret < 0)
	200	return ret;
	201
	202	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	203	ret = -EFAULT;
	204	return ret;
	205	}
	206
	207	static ssize_t
b028fcfc	208	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	209	void *buf, size_t size, size_t nmembs)
7942b919 KS	210	{
7942b919 KS	211	int ret;
7942b919 KS	212
47420c79	213	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	214	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
47420c79	215	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	216	return ret;
	217	}
	218
	219	static ssize_t
b028fcfc	220	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	221	void *buf, size_t size, size_t nmembs)
	222	{
	223	struct inode *dat = nilfs_dat_inode(nilfs);
	224	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	225	struct nilfs_bdesc *bdescs = buf;
	226	int ret, i;
	227
47eb6b9c	228	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	229	for (i = 0; i < nmembs; i++) {
	230	ret = nilfs_bmap_lookup_at_level(bmap,
	231	bdescs[i].bd_offset,
	232	bdescs[i].bd_level + 1,
	233	&bdescs[i].bd_blocknr);
	234	if (ret < 0) {
47eb6b9c RK	235	if (ret != -ENOENT) {
47eb6b9c RK	236	up_read(&nilfs->ns_segctor_sem);
7942b919	237	return ret;
47eb6b9c	238	}
7942b919 KS	239	bdescs[i].bd_blocknr = 0;
	240	}
	241	}
47eb6b9c	242	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	243	return nmembs;
	244	}
	245
	246	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	247	unsigned int cmd, void __user *argp)
	248	{
	249	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	250	struct nilfs_argv argv;
7942b919 KS	251	int ret;
	252
	253	if (copy_from_user(&argv, argp, sizeof(argv)))
	254	return -EFAULT;
	255
7942b919 KS	256	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	257	nilfs_ioctl_do_get_bdescs);
47420c79 RK	258	if (ret < 0)
47420c79 RK	259	return ret;
7942b919 KS	260
	261	if (copy_to_user(argp, &argv, sizeof(argv)))
	262	ret = -EFAULT;
	263	return ret;
	264	}
	265
	266	static int nilfs_ioctl_move_inode_block(struct inode *inode,
	267	struct nilfs_vdesc *vdesc,
	268	struct list_head *buffers)
	269	{
	270	struct buffer_head *bh;
	271	int ret;
	272
	273	if (vdesc->vd_flags == 0)
	274	ret = nilfs_gccache_submit_read_data(
	275	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	276	vdesc->vd_vblocknr, &bh);
	277	else
	278	ret = nilfs_gccache_submit_read_node(
	279	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	280
	281	if (unlikely(ret < 0)) {
	282	if (ret == -ENOENT)
	283	printk(KERN_CRIT
	284	"%s: invalid virtual block address (%s): "
	285	"ino=%llu, cno=%llu, offset=%llu, "
	286	"blocknr=%llu, vblocknr=%llu\n",
	287	__func__, vdesc->vd_flags ? "node" : "data",
	288	(unsigned long long)vdesc->vd_ino,
	289	(unsigned long long)vdesc->vd_cno,
	290	(unsigned long long)vdesc->vd_offset,
	291	(unsigned long long)vdesc->vd_blocknr,
	292	(unsigned long long)vdesc->vd_vblocknr);
	293	return ret;
	294	}
	295	bh->b_private = vdesc;
	296	list_add_tail(&bh->b_assoc_buffers, buffers);
	297	return 0;
	298	}
	299
	300	static ssize_t
b028fcfc	301	nilfs_ioctl_do_move_blocks(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	302	void *buf, size_t size, size_t nmembs)
	303	{
	304	struct inode *inode;
	305	struct nilfs_vdesc *vdesc;
	306	struct buffer_head bh, n;
	307	LIST_HEAD(buffers);
	308	ino_t ino;
	309	__u64 cno;
	310	int i, ret;
	311
	312	for (i = 0, vdesc = buf; i < nmembs; ) {
	313	ino = vdesc->vd_ino;
	314	cno = vdesc->vd_cno;
	315	inode = nilfs_gc_iget(nilfs, ino, cno);
	316	if (unlikely(inode == NULL)) {
	317	ret = -ENOMEM;
	318	goto failed;
	319	}
	320	do {
	321	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	322	&buffers);
	323	if (unlikely(ret < 0))
	324	goto failed;
	325	vdesc++;
	326	} while (++i < nmembs &&
	327	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	328	}
	329
	330	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	331	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	332	if (unlikely(ret < 0)) {
	333	if (ret == -EEXIST) {
	334	vdesc = bh->b_private;
	335	printk(KERN_CRIT
	336	"%s: conflicting %s buffer: "
	337	"ino=%llu, cno=%llu, offset=%llu, "
	338	"blocknr=%llu, vblocknr=%llu\n",
	339	__func__,
	340	vdesc->vd_flags ? "node" : "data",
	341	(unsigned long long)vdesc->vd_ino,
	342	(unsigned long long)vdesc->vd_cno,
	343	(unsigned long long)vdesc->vd_offset,
	344	(unsigned long long)vdesc->vd_blocknr,
	345	(unsigned long long)vdesc->vd_vblocknr);
	346	}
	347	goto failed;
	348	}
	349	list_del_init(&bh->b_assoc_buffers);
	350	bh->b_private = NULL;
	351	brelse(bh);
	352	}
	353	return nmembs;
	354
	355	failed:
	356	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	357	list_del_init(&bh->b_assoc_buffers);
	358	bh->b_private = NULL;
	359	brelse(bh);
	360	}
	361	return ret;
	362	}
	363
	364	static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
	365	struct nilfs_argv *argv,
366	int dir)
367	{
368	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
369	nilfs_ioctl_do_move_blocks);
370	}
371
372	static ssize_t
b028fcfc	373	nilfs_ioctl_do_delete_checkpoints(struct the_nilfs nilfs, __u64 posp,
7942b919 KS	374	int flags, void *buf, size_t size,
	375	size_t nmembs)
	376	{
	377	struct inode *cpfile = nilfs->ns_cpfile;
	378	struct nilfs_period *periods = buf;
	379	int ret, i;
	380
	381	for (i = 0; i < nmembs; i++) {
	382	ret = nilfs_cpfile_delete_checkpoints(
	383	cpfile, periods[i].p_start, periods[i].p_end);
	384	if (ret < 0)
	385	return ret;
	386	}
	387	return nmembs;
	388	}
	389
	390	static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
	391	struct nilfs_argv *argv,
	392	int dir)
	393	{
	394	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	395	nilfs_ioctl_do_delete_checkpoints);
	396	}
	397
	398	static ssize_t
b028fcfc	399	nilfs_ioctl_do_free_vblocknrs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	400	void *buf, size_t size, size_t nmembs)
	401	{
	402	int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
	403
	404	return (ret < 0) ? ret : nmembs;
	405	}
	406
	407	static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
	408	struct nilfs_argv *argv,
	409	int dir)
	410	{
	411	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	412	nilfs_ioctl_do_free_vblocknrs);
	413	}
	414
	415	static ssize_t
b028fcfc RK	416	nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs nilfs, __u64 posp,
	417	int flags, void *buf, size_t size,
	418	size_t nmembs)
7942b919 KS	419	{
	420	struct inode *dat = nilfs_dat_inode(nilfs);
	421	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	422	struct nilfs_bdesc *bdescs = buf;
	423	int ret, i;
	424
	425	for (i = 0; i < nmembs; i++) {
	426	/* XXX: use macro or inline func to check liveness */
	427	ret = nilfs_bmap_lookup_at_level(bmap,
	428	bdescs[i].bd_offset,
	429	bdescs[i].bd_level + 1,
	430	&bdescs[i].bd_blocknr);
	431	if (ret < 0) {
	432	if (ret != -ENOENT)
	433	return ret;
	434	bdescs[i].bd_blocknr = 0;
	435	}
	436	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	437	/* skip dead block */
	438	continue;
	439	if (bdescs[i].bd_level == 0) {
	440	ret = nilfs_mdt_mark_block_dirty(dat,
	441	bdescs[i].bd_offset);
	442	if (ret < 0) {
1f5abe7e	443	WARN_ON(ret == -ENOENT);
7942b919 KS	444	return ret;
	445	}
	446	} else {
	447	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	448	bdescs[i].bd_level);
	449	if (ret < 0) {
1f5abe7e	450	WARN_ON(ret == -ENOENT);
7942b919 KS	451	return ret;
	452	}
	453	}
	454	}
	455	return nmembs;
	456	}
	457
	458	static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
	459	struct nilfs_argv *argv,
	460	int dir)
	461	{
	462	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	463	nilfs_ioctl_do_mark_blocks_dirty);
	464	}
	465
	466	static ssize_t
b028fcfc	467	nilfs_ioctl_do_free_segments(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	468	void *buf, size_t size, size_t nmembs)
7942b919 KS	469	{
201913ed	470	struct nilfs_sb_info *sbi = nilfs->ns_writer;
7942b919 KS	471	int ret;
7942b919 KS	472
201913ed RK	473	if (unlikely(!sbi)) {
	474	/* never happens because called for a writable mount */
	475	WARN_ON(1);
1f5abe7e	476	return -EROFS;
201913ed	477	}
7942b919 KS	478	ret = nilfs_segctor_add_segments_to_be_freed(
7942b919 KS	479	NILFS_SC(sbi), buf, nmembs);
7942b919 KS	480
	481	return (ret < 0) ? ret : nmembs;
	482	}
	483
	484	static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
	485	struct nilfs_argv *argv,
	486	int dir)
	487	{
	488	return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
	489	nilfs_ioctl_do_free_segments);
	490	}
	491
	492	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
	493	void __user *argp)
	494	{
	495	struct nilfs_argv argv[5];
1f5abe7e	496	const char *msg;
7942b919 KS	497	int dir, ret;
	498
	499	if (copy_from_user(argv, argp, sizeof(argv)))
	500	return -EFAULT;
	501
	502	dir = _IOC_WRITE;
	503	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
1f5abe7e RK	504	if (ret < 0) {
	505	msg = "cannot read source blocks";
	506	goto failed;
	507	}
7942b919	508	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
1f5abe7e RK	509	if (ret < 0) {
	510	/*
	511	* can safely abort because checkpoints can be removed
	512	* independently.
	513	*/
	514	msg = "cannot delete checkpoints";
	515	goto failed;
	516	}
7942b919	517	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
1f5abe7e RK	518	if (ret < 0) {
	519	/*
	520	* can safely abort because DAT file is updated atomically
	521	* using a copy-on-write technique.
	522	*/
	523	msg = "cannot delete virtual blocks from DAT file";
	524	goto failed;
	525	}
7942b919	526	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
1f5abe7e RK	527	if (ret < 0) {
	528	/*
	529	* can safely abort because the operation is nondestructive.
	530	*/
	531	msg = "cannot mark copying blocks dirty";
	532	goto failed;
	533	}
7942b919	534	ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
1f5abe7e RK	535	if (ret < 0) {
	536	/*
	537	* can safely abort because this operation is atomic.
	538	*/
	539	msg = "cannot set segments to be freed";
	540	goto failed;
	541	}
7942b919 KS	542	return 0;
7942b919 KS	543
1f5abe7e	544	failed:
7942b919	545	nilfs_remove_all_gcinode(nilfs);
1f5abe7e RK	546	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	547	msg, ret);
7942b919 KS	548	return ret;
	549	}
	550
	551	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	552	unsigned int cmd, void __user *argp)
	553	{
7942b919 KS	554	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	555	return -EPERM;
1088dcf4	556	return nilfs_clean_segments(inode->i_sb, argp);
7942b919 KS	557	}
	558
	559	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	560	unsigned int cmd, void __user *argp)
	561	{
	562	__u64 cno;
	563	int ret;
	564
	565	ret = nilfs_construct_segment(inode->i_sb);
	566	if (ret < 0)
	567	return ret;
	568
	569	if (argp != NULL) {
	570	cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
	571	if (copy_to_user(argp, &cno, sizeof(cno)))
	572	return -EFAULT;
	573	}
	574	return 0;
	575	}
	576
47eb6b9c RK	577	static int nilfs_ioctl_get_info(struct inode inode, struct file filp,
	578	unsigned int cmd, void __user *argp,
	579	ssize_t (dofunc)(struct the_nilfs ,
	580	__u64 *, int,
	581	void *, size_t, size_t))
	582
	583	{
	584	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	585	struct nilfs_argv argv;
	586	int ret;
	587
	588	if (copy_from_user(&argv, argp, sizeof(argv)))
	589	return -EFAULT;
	590
	591	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	592	if (ret < 0)
	593	return ret;
	594
	595	if (copy_to_user(argp, &argv, sizeof(argv)))
	596	ret = -EFAULT;
	597	return ret;
	598	}
	599
7a946193	600	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	601	{
7a946193	602	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	603	void __user argp = (void __user *)arg;
	604
	605	switch (cmd) {
	606	case NILFS_IOCTL_CHANGE_CPMODE:
	607	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	608	case NILFS_IOCTL_DELETE_CHECKPOINT:
	609	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	610	case NILFS_IOCTL_GET_CPINFO:
47eb6b9c RK	611	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
47eb6b9c RK	612	nilfs_ioctl_do_get_cpinfo);
7942b919 KS	613	case NILFS_IOCTL_GET_CPSTAT:
	614	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	615	case NILFS_IOCTL_GET_SUINFO:
47eb6b9c RK	616	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
47eb6b9c RK	617	nilfs_ioctl_do_get_suinfo);
7942b919 KS	618	case NILFS_IOCTL_GET_SUSTAT:
	619	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	620	case NILFS_IOCTL_GET_VINFO:
47eb6b9c RK	621	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
47eb6b9c RK	622	nilfs_ioctl_do_get_vinfo);
7942b919 KS	623	case NILFS_IOCTL_GET_BDESCS:
	624	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	625	case NILFS_IOCTL_CLEAN_SEGMENTS:
	626	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	627	case NILFS_IOCTL_SYNC:
	628	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	629	default:
	630	return -ENOTTY;
	631	}
	632	}