Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1345 insertions, 0 deletions

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
new file mode 100644
index 0000000000..40ffade49f
--- /dev/null
+++ b/fs/nilfs2/ioctl.c
@@ -0,0 +1,1345 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * NILFS ioctl operations.
+ *
+ * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * Written by Koji Sato.
+ */
+
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/capability.h>	/* capable() */
+#include <linux/uaccess.h>	/* copy_from_user(), copy_to_user() */
+#include <linux/vmalloc.h>
+#include <linux/compat.h>	/* compat_ptr() */
+#include <linux/mount.h>	/* mnt_want_write_file(), mnt_drop_write_file() */
+#include <linux/buffer_head.h>
+#include <linux/fileattr.h>
+#include "nilfs.h"
+#include "segment.h"
+#include "bmap.h"
+#include "cpfile.h"
+#include "sufile.h"
+#include "dat.h"
+
+/**
+ * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
+ * @nilfs: nilfs object
+ * @argv: vector of arguments from userspace
+ * @dir: set of direction flags
+ * @dofunc: concrete function of get/set metadata info
+ *
+ * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
+ * calling dofunc() function on the basis of @argv argument.
+ *
+ * Return Value: On success, 0 is returned and requested metadata info
+ * is copied into userspace. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EINVAL - Invalid arguments from userspace.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EFAULT - Failure during execution of requested operation.
+ */
+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;
+
+	/*
+	 * Reject pairs of a start item position (argv->v_index) and a
+	 * total count (argv->v_nmembs) which leads position 'pos' to
+	 * overflow by the increment at the end of the loop.
+	 */
+	if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
+		return -EINVAL;
+
+	buf = (void *)get_zeroed_page(GFP_NOFS);
+	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;
+}
+
+/**
+ * nilfs_fileattr_get - ioctl to support lsattr
+ */
+int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+
+	fileattr_fill_flags(fa, NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE);
+
+	return 0;
+}
+
+/**
+ * nilfs_fileattr_set - ioctl to support chattr
+ */
+int nilfs_fileattr_set(struct mnt_idmap *idmap,
+		       struct dentry *dentry, struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+	struct nilfs_transaction_info ti;
+	unsigned int flags, oldflags;
+	int ret;
+
+	if (fileattr_has_fsx(fa))
+		return -EOPNOTSUPP;
+
+	flags = nilfs_mask_flags(inode->i_mode, fa->flags);
+
+	ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
+	if (ret)
+		return ret;
+
+	oldflags = NILFS_I(inode)->i_flags & ~FS_FL_USER_MODIFIABLE;
+	NILFS_I(inode)->i_flags = oldflags | (flags & FS_FL_USER_MODIFIABLE);
+
+	nilfs_set_inode_flags(inode);
+	inode_set_ctime_current(inode);
+	if (IS_SYNC(inode))
+		nilfs_set_transaction_flag(NILFS_TI_SYNC);
+
+	nilfs_mark_inode_dirty(inode);
+	return nilfs_transaction_commit(inode->i_sb);
+}
+
+/**
+ * nilfs_ioctl_getversion - get info about a file's version (generation number)
+ */
+static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
+{
+	return put_user(inode->i_generation, (int __user *)argp);
+}
+
+/**
+ * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_change_cpmode() function changes mode of
+ * given checkpoint between checkpoint and snapshot state. This ioctl
+ * is used in chcp and mkcp utilities.
+ *
+ * Return Value: On success, 0 is returned and mode of a checkpoint is
+ * changed. On error, one of the following negative error codes
+ * is returned.
+ *
+ * %-EPERM - Operation not permitted.
+ *
+ * %-EFAULT - Failure during checkpoint mode changing.
+ */
+static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
+				     unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	struct nilfs_transaction_info ti;
+	struct nilfs_cpmode cpmode;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
+
+	ret = -EFAULT;
+	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
+		goto out;
+
+	mutex_lock(&nilfs->ns_snapshot_mount_mutex);
+
+	nilfs_transaction_begin(inode->i_sb, &ti, 0);
+	ret = nilfs_cpfile_change_cpmode(
+		nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
+	if (unlikely(ret < 0))
+		nilfs_transaction_abort(inode->i_sb);
+	else
+		nilfs_transaction_commit(inode->i_sb); /* never fails */
+
+	mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
+out:
+	mnt_drop_write_file(filp);
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_delete_checkpoint - remove checkpoint
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_delete_checkpoint() function removes
+ * checkpoint from NILFS2 file system. This ioctl is used in rmcp
+ * utility.
+ *
+ * Return Value: On success, 0 is returned and a checkpoint is
+ * removed. On error, one of the following negative error codes
+ * is returned.
+ *
+ * %-EPERM - Operation not permitted.
+ *
+ * %-EFAULT - Failure during checkpoint removing.
+ */
+static int
+nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
+			      unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	struct nilfs_transaction_info ti;
+	__u64 cno;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
+
+	ret = -EFAULT;
+	if (copy_from_user(&cno, argp, sizeof(cno)))
+		goto out;
+
+	nilfs_transaction_begin(inode->i_sb, &ti, 0);
+	ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
+	if (unlikely(ret < 0))
+		nilfs_transaction_abort(inode->i_sb);
+	else
+		nilfs_transaction_commit(inode->i_sb); /* never fails */
+out:
+	mnt_drop_write_file(filp);
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
+ * @nilfs: nilfs object
+ * @posp: pointer on array of checkpoint's numbers
+ * @flags: checkpoint mode (checkpoint or snapshot)
+ * @buf: buffer for storing checkponts' info
+ * @size: size in bytes of one checkpoint info item in array
+ * @nmembs: number of checkpoints in array (numbers and infos)
+ *
+ * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
+ * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
+ * lscp utility and by nilfs_cleanerd daemon.
+ *
+ * Return value: count of nilfs_cpinfo structures in output buffer.
+ */
+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;
+}
+
+/**
+ * nilfs_ioctl_get_cpstat - get checkpoints statistics
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
+ * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
+ * and by nilfs_cleanerd daemon.
+ *
+ * Return Value: On success, 0 is returned, and checkpoints information is
+ * copied into userspace pointer @argp. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EFAULT - Failure during getting checkpoints statistics.
+ */
+static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
+				  unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	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;
+}
+
+/**
+ * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
+ * @nilfs: nilfs object
+ * @posp: pointer on array of segment numbers
+ * @flags: *not used*
+ * @buf: buffer for storing suinfo array
+ * @size: size in bytes of one suinfo item in array
+ * @nmembs: count of segment numbers and suinfos in array
+ *
+ * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
+ * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
+ * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
+ *
+ * Return value: count of nilfs_suinfo structures in output buffer.
+ */
+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;
+}
+
+/**
+ * nilfs_ioctl_get_sustat - get segment usage statistics
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
+ * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
+ * and by nilfs_cleanerd daemon.
+ *
+ * Return Value: On success, 0 is returned, and segment usage information is
+ * copied into userspace pointer @argp. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EFAULT - Failure during getting segment usage statistics.
+ */
+static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
+				  unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	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;
+}
+
+/**
+ * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
+ * @nilfs: nilfs object
+ * @posp: *not used*
+ * @flags: *not used*
+ * @buf: buffer for storing array of nilfs_vinfo structures
+ * @size: size in bytes of one vinfo item in array
+ * @nmembs: count of vinfos in array
+ *
+ * Description: nilfs_ioctl_do_get_vinfo() function returns information
+ * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
+ * by nilfs_cleanerd daemon.
+ *
+ * Return value: count of nilfs_vinfo structures in output buffer.
+ */
+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->ns_dat, buf, size, nmembs);
+	up_read(&nilfs->ns_segctor_sem);
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
+ * @nilfs: nilfs object
+ * @posp: *not used*
+ * @flags: *not used*
+ * @buf: buffer for storing array of nilfs_bdesc structures
+ * @size: size in bytes of one bdesc item in array
+ * @nmembs: count of bdescs in array
+ *
+ * Description: nilfs_ioctl_do_get_bdescs() function returns information
+ * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
+ * is used by nilfs_cleanerd daemon.
+ *
+ * Return value: count of nilfs_bdescs structures in output buffer.
+ */
+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 nilfs_bmap *bmap = NILFS_I(nilfs->ns_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;
+}
+
+/**
+ * nilfs_ioctl_get_bdescs - get disk block descriptors
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_do_get_bdescs() function returns information
+ * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
+ * is used by nilfs_cleanerd daemon.
+ *
+ * Return Value: On success, 0 is returned, and disk block descriptors are
+ * copied into userspace pointer @argp. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EINVAL - Invalid arguments from userspace.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EFAULT - Failure during getting disk block descriptors.
+ */
+static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
+				  unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	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;
+}
+
+/**
+ * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
+ * @inode: inode object
+ * @vdesc: descriptor of virtual block number
+ * @buffers: list of moving buffers
+ *
+ * Description: nilfs_ioctl_move_inode_block() function registers data/node
+ * buffer in the GC pagecache and submit read request.
+ *
+ * Return Value: On success, 0 is returned. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-ENOENT - Requested block doesn't exist.
+ *
+ * %-EEXIST - Blocks conflict is detected.
+ */
+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)
+			nilfs_crit(inode->i_sb,
+				   "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
+				   __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))) {
+		nilfs_crit(inode->i_sb,
+			   "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
+			   __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;
+}
+
+/**
+ * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
+ * @sb: superblock object
+ * @argv: vector of arguments from userspace
+ * @buf: array of nilfs_vdesc structures
+ *
+ * Description: nilfs_ioctl_move_blocks() function reads valid data/node
+ * blocks that garbage collector specified with the array of nilfs_vdesc
+ * structures and stores them into page caches of GC inodes.
+ *
+ * Return Value: Number of processed nilfs_vdesc structures or
+ * error code, otherwise.
+ */
+static int nilfs_ioctl_move_blocks(struct super_block *sb,
+				   struct nilfs_argv *argv, void *buf)
+{
+	size_t nmembs = argv->v_nmembs;
+	struct the_nilfs *nilfs = sb->s_fs_info;
+	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_iget_for_gc(sb, ino, cno);
+		if (IS_ERR(inode)) {
+			ret = PTR_ERR(inode);
+			goto failed;
+		}
+		if (list_empty(&NILFS_I(inode)->i_dirty)) {
+			/*
+			 * Add the inode to GC inode list. Garbage Collection
+			 * is serialized and no two processes manipulate the
+			 * list simultaneously.
+			 */
+			igrab(inode);
+			list_add(&NILFS_I(inode)->i_dirty,
+				 &nilfs->ns_gc_inodes);
+		}
+
+		do {
+			ret = nilfs_ioctl_move_inode_block(inode, vdesc,
+							   &buffers);
+			if (unlikely(ret < 0)) {
+				iput(inode);
+				goto failed;
+			}
+			vdesc++;
+		} while (++i < nmembs &&
+			 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
+
+		iput(inode); /* The inode still remains in GC inode list */
+	}
+
+	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;
+}
+
+/**
+ * nilfs_ioctl_delete_checkpoints - delete checkpoints
+ * @nilfs: nilfs object
+ * @argv: vector of arguments from userspace
+ * @buf: array of periods of checkpoints numbers
+ *
+ * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
+ * in the period from p_start to p_end, excluding p_end itself. The checkpoints
+ * which have been already deleted are ignored.
+ *
+ * Return Value: Number of processed nilfs_period structures or
+ * error code, otherwise.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EINVAL - invalid checkpoints.
+ */
+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;
+}
+
+/**
+ * nilfs_ioctl_free_vblocknrs - free virtual block numbers
+ * @nilfs: nilfs object
+ * @argv: vector of arguments from userspace
+ * @buf: array of virtual block numbers
+ *
+ * Description: nilfs_ioctl_free_vblocknrs() function frees
+ * the virtual block numbers specified by @buf and @argv->v_nmembs.
+ *
+ * Return Value: Number of processed virtual block numbers or
+ * error code, otherwise.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-ENOENT - The virtual block number have not been allocated.
+ */
+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->ns_dat, buf, nmembs);
+
+	return (ret < 0) ? ret : nmembs;
+}
+
+/**
+ * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
+ * @nilfs: nilfs object
+ * @argv: vector of arguments from userspace
+ * @buf: array of block descriptors
+ *
+ * Description: nilfs_ioctl_mark_blocks_dirty() function marks
+ * metadata file or data blocks as dirty.
+ *
+ * Return Value: Number of processed block descriptors or
+ * error code, otherwise.
+ *
+ * %-ENOMEM - Insufficient memory available.
+ *
+ * %-EIO - I/O error
+ *
+ * %-ENOENT - the specified block does not exist (hole block)
+ */
+static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
+					 struct nilfs_argv *argv, void *buf)
+{
+	size_t nmembs = argv->v_nmembs;
+	struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
+	struct nilfs_bdesc *bdescs = buf;
+	struct buffer_head *bh;
+	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_get_block(nilfs->ns_dat,
+						  bdescs[i].bd_offset,
+						  false, NULL, &bh);
+			if (unlikely(ret)) {
+				WARN_ON(ret == -ENOENT);
+				return ret;
+			}
+			mark_buffer_dirty(bh);
+			nilfs_mdt_mark_dirty(nilfs->ns_dat);
+			put_bh(bh);
+		} 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:
+	nilfs_err(nilfs->ns_sb, "error %d preparing GC: %s", ret, msg);
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_clean_segments - clean segments
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_clean_segments() function makes garbage
+ * collection operation in the environment of requested parameters
+ * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
+ * nilfs_cleanerd daemon.
+ *
+ * Return Value: On success, 0 is returned or error code, otherwise.
+ */
+static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
+				      unsigned int cmd, void __user *argp)
+{
+	struct nilfs_argv argv[5];
+	static const 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;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
+
+	ret = -EFAULT;
+	if (copy_from_user(argv, argp, sizeof(argv)))
+		goto out;
+
+	ret = -EINVAL;
+	nsegs = argv[4].v_nmembs;
+	if (argv[4].v_size != argsz[4])
+		goto out;
+	if (nsegs > UINT_MAX / sizeof(__u64))
+		goto out;
+
+	/*
+	 * 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])) {
+		ret = PTR_ERR(kbufs[4]);
+		goto out;
+	}
+	nilfs = inode->i_sb->s_fs_info;
+
+	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;
+
+		if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
+			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_iget_for_gc(),
+	 * 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(inode->i_sb, &argv[0], kbufs[0]);
+	if (ret < 0) {
+		nilfs_err(inode->i_sb,
+			  "error %d preparing GC: cannot read source blocks",
+			  ret);
+	} else {
+		if (nilfs_sb_need_update(nilfs))
+			set_nilfs_discontinued(nilfs);
+		ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
+	}
+
+	nilfs_remove_all_gcinodes(nilfs);
+	clear_nilfs_gc_running(nilfs);
+
+out_free:
+	while (--n >= 0)
+		vfree(kbufs[n]);
+	kfree(kbufs[4]);
+out:
+	mnt_drop_write_file(filp);
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_sync - make a checkpoint
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_sync() function constructs a logical segment
+ * for checkpointing.  This function guarantees that all modified data
+ * and metadata are written out to the device when it successfully
+ * returned.
+ *
+ * Return Value: On success, 0 is retured. On errors, one of the following
+ * negative error code is returned.
+ *
+ * %-EROFS - Read only filesystem.
+ *
+ * %-EIO - I/O error
+ *
+ * %-ENOSPC - No space left on device (only in a panic state).
+ *
+ * %-ERESTARTSYS - Interrupted.
+ *
+ * %-ENOMEM - Insufficient memory available.
+ *
+ * %-EFAULT - Failure during execution of requested operation.
+ */
+static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
+			    unsigned int cmd, void __user *argp)
+{
+	__u64 cno;
+	int ret;
+	struct the_nilfs *nilfs;
+
+	ret = nilfs_construct_segment(inode->i_sb);
+	if (ret < 0)
+		return ret;
+
+	nilfs = inode->i_sb->s_fs_info;
+	ret = nilfs_flush_device(nilfs);
+	if (ret < 0)
+		return ret;
+
+	if (argp != NULL) {
+		down_read(&nilfs->ns_segctor_sem);
+		cno = nilfs->ns_cno - 1;
+		up_read(&nilfs->ns_segctor_sem);
+		if (copy_to_user(argp, &cno, sizeof(cno)))
+			return -EFAULT;
+	}
+	return 0;
+}
+
+/**
+ * nilfs_ioctl_resize - resize NILFS2 volume
+ * @inode: inode object
+ * @filp: file object
+ * @argp: pointer on argument from userspace
+ *
+ * Return Value: On success, 0 is returned or error code, otherwise.
+ */
+static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
+			      void __user *argp)
+{
+	__u64 newsize;
+	int ret = -EPERM;
+
+	if (!capable(CAP_SYS_ADMIN))
+		goto out;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		goto out;
+
+	ret = -EFAULT;
+	if (copy_from_user(&newsize, argp, sizeof(newsize)))
+		goto out_drop_write;
+
+	ret = nilfs_resize_fs(inode->i_sb, newsize);
+
+out_drop_write:
+	mnt_drop_write_file(filp);
+out:
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_trim_fs() - trim ioctl handle function
+ * @inode: inode object
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
+ * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
+ * performs the actual trim operation.
+ *
+ * Return Value: On success, 0 is returned or negative error code, otherwise.
+ */
+static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	struct fstrim_range range;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (!bdev_max_discard_sectors(nilfs->ns_bdev))
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&range, argp, sizeof(range)))
+		return -EFAULT;
+
+	range.minlen = max_t(u64, range.minlen,
+			     bdev_discard_granularity(nilfs->ns_bdev));
+
+	down_read(&nilfs->ns_segctor_sem);
+	ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
+	up_read(&nilfs->ns_segctor_sem);
+
+	if (ret < 0)
+		return ret;
+
+	if (copy_to_user(argp, &range, sizeof(range)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/**
+ * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
+ * @inode: inode object
+ * @argp: pointer on argument from userspace
+ *
+ * Description: nilfs_ioctl_set_alloc_range() function defines lower limit
+ * of segments in bytes and upper limit of segments in bytes.
+ * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
+ *
+ * Return Value: On success, 0 is returned or error code, otherwise.
+ */
+static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	__u64 range[2];
+	__u64 minseg, maxseg;
+	unsigned long segbytes;
+	int ret = -EPERM;
+
+	if (!capable(CAP_SYS_ADMIN))
+		goto out;
+
+	ret = -EFAULT;
+	if (copy_from_user(range, argp, sizeof(__u64[2])))
+		goto out;
+
+	ret = -ERANGE;
+	if (range[1] > bdev_nr_bytes(inode->i_sb->s_bdev))
+		goto out;
+
+	segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
+
+	minseg = range[0] + segbytes - 1;
+	do_div(minseg, segbytes);
+
+	if (range[1] < 4096)
+		goto out;
+
+	maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
+	if (maxseg < segbytes)
+		goto out;
+
+	do_div(maxseg, segbytes);
+	maxseg--;
+
+	ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
+out:
+	return ret;
+}
+
+/**
+ * nilfs_ioctl_get_info - wrapping function of get metadata info
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ * @membsz: size of an item in bytes
+ * @dofunc: concrete function of getting metadata info
+ *
+ * Description: nilfs_ioctl_get_info() gets metadata info by means of
+ * calling dofunc() function.
+ *
+ * Return Value: On success, 0 is returned and requested metadata info
+ * is copied into userspace. On error, one of the following
+ * negative error codes is returned.
+ *
+ * %-EINVAL - Invalid arguments from userspace.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EFAULT - Failure during execution of requested operation.
+ */
+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 = inode->i_sb->s_fs_info;
+	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;
+}
+
+/**
+ * nilfs_ioctl_set_suinfo - set segment usage info
+ * @inode: inode object
+ * @filp: file object
+ * @cmd: ioctl's request code
+ * @argp: pointer on argument from userspace
+ *
+ * Description: Expects an array of nilfs_suinfo_update structures
+ * encapsulated in nilfs_argv and updates the segment usage info
+ * according to the flags in nilfs_suinfo_update.
+ *
+ * Return Value: On success, 0 is returned. On error, one of the
+ * following negative error codes is returned.
+ *
+ * %-EPERM - Not enough permissions
+ *
+ * %-EFAULT - Error copying input data
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
+ */
+static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
+				unsigned int cmd, void __user *argp)
+{
+	struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+	struct nilfs_transaction_info ti;
+	struct nilfs_argv argv;
+	size_t len;
+	void __user *base;
+	void *kbuf;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
+
+	ret = -EFAULT;
+	if (copy_from_user(&argv, argp, sizeof(argv)))
+		goto out;
+
+	ret = -EINVAL;
+	if (argv.v_size < sizeof(struct nilfs_suinfo_update))
+		goto out;
+
+	if (argv.v_nmembs > nilfs->ns_nsegments)
+		goto out;
+
+	if (argv.v_nmembs >= UINT_MAX / argv.v_size)
+		goto out;
+
+	len = argv.v_size * argv.v_nmembs;
+	if (!len) {
+		ret = 0;
+		goto out;
+	}
+
+	base = (void __user *)(unsigned long)argv.v_base;
+	kbuf = vmalloc(len);
+	if (!kbuf) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	if (copy_from_user(kbuf, base, len)) {
+		ret = -EFAULT;
+		goto out_free;
+	}
+
+	nilfs_transaction_begin(inode->i_sb, &ti, 0);
+	ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
+			argv.v_nmembs);
+	if (unlikely(ret < 0))
+		nilfs_transaction_abort(inode->i_sb);
+	else
+		nilfs_transaction_commit(inode->i_sb); /* never fails */
+
+out_free:
+	vfree(kbuf);
+out:
+	mnt_drop_write_file(filp);
+	return ret;
+}
+
+long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	void __user *argp = (void __user *)arg;
+
+	switch (cmd) {
+	case FS_IOC_GETVERSION:
+		return nilfs_ioctl_getversion(inode, argp);
+	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_SET_SUINFO:
+		return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
+	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);
+	case NILFS_IOCTL_RESIZE:
+		return nilfs_ioctl_resize(inode, filp, argp);
+	case NILFS_IOCTL_SET_ALLOC_RANGE:
+		return nilfs_ioctl_set_alloc_range(inode, argp);
+	case FITRIM:
+		return nilfs_ioctl_trim_fs(inode, argp);
+	default:
+		return -ENOTTY;
+	}
+}
+
+#ifdef CONFIG_COMPAT
+long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case FS_IOC32_GETVERSION:
+		cmd = FS_IOC_GETVERSION;
+		break;
+	case NILFS_IOCTL_CHANGE_CPMODE:
+	case NILFS_IOCTL_DELETE_CHECKPOINT:
+	case NILFS_IOCTL_GET_CPINFO:
+	case NILFS_IOCTL_GET_CPSTAT:
+	case NILFS_IOCTL_GET_SUINFO:
+	case NILFS_IOCTL_SET_SUINFO:
+	case NILFS_IOCTL_GET_SUSTAT:
+	case NILFS_IOCTL_GET_VINFO:
+	case NILFS_IOCTL_GET_BDESCS:
+	case NILFS_IOCTL_CLEAN_SEGMENTS:
+	case NILFS_IOCTL_SYNC:
+	case NILFS_IOCTL_RESIZE:
+	case NILFS_IOCTL_SET_ALLOC_RANGE:
+	case FITRIM:
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif