[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/mount.h>	/* mnt_want_write(), mnt_drop_write() */
#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;

	ret = mnt_want_write(filp->f_path.mnt);
	if (ret)
		return ret;

	ret = -EFAULT;
	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
		goto out;

	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);
	else
		nilfs_transaction_commit(inode->i_sb); /* never fails */

	mutex_unlock(&nilfs->ns_mount_mutex);
out:
	mnt_drop_write(filp->f_path.mnt);
	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;

	ret = mnt_want_write(filp->f_path.mnt);
	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(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(filp->f_path.mnt);
	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];
	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(filp->f_path.mnt);
	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;

	/*
	 * 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 = 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]);
out:
	mnt_drop_write(filp->f_path.mnt);
	return ret;
}

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;

	if (argp != NULL) {
		nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
		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;
}

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>
7512487e	29	#include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */
7942b919 KS	30	#include <linux/nilfs2_fs.h>
	31	#include "nilfs.h"
	32	#include "segment.h"
	33	#include "bmap.h"
	34	#include "cpfile.h"
	35	#include "sufile.h"
	36	#include "dat.h"
	37
	38
7942b919 KS	39	static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
	40	struct nilfs_argv *argv, int dir,
	41	ssize_t (dofunc)(struct the_nilfs ,
b028fcfc	42	__u64 *, int,
7942b919 KS	43	void *, size_t, size_t))
	44	{
	45	void *buf;
dc498d09	46	void __user base = (void __user )(unsigned long)argv->v_base;
3358b4aa	47	size_t maxmembs, total, n;
7942b919 KS	48	ssize_t nr;
7942b919 KS	49	int ret, i;
b028fcfc	50	__u64 pos, ppos;
7942b919 KS	51
	52	if (argv->v_nmembs == 0)
	53	return 0;
	54
3358b4aa RK	55	if (argv->v_size > PAGE_SIZE)
	56	return -EINVAL;
	57
	58	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	59	if (unlikely(!buf))
7942b919	60	return -ENOMEM;
3358b4aa	61	maxmembs = PAGE_SIZE / argv->v_size;
7942b919 KS	62
	63	ret = 0;
	64	total = 0;
b028fcfc	65	pos = argv->v_index;
7942b919 KS	66	for (i = 0; i < argv->v_nmembs; i += n) {
	67	n = (argv->v_nmembs - i < maxmembs) ?
	68	argv->v_nmembs - i : maxmembs;
	69	if ((dir & _IOC_WRITE) &&
dc498d09 RK	70	copy_from_user(buf, base + argv->v_size * i,
dc498d09 RK	71	argv->v_size * n)) {
7942b919 KS	72	ret = -EFAULT;
	73	break;
	74	}
b028fcfc	75	ppos = pos;
8acfbf09	76	nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
b028fcfc	77	n);
7942b919 KS	78	if (nr < 0) {
	79	ret = nr;
	80	break;
	81	}
	82	if ((dir & _IOC_READ) &&
dc498d09 RK	83	copy_to_user(base + argv->v_size * i, buf,
dc498d09 RK	84	argv->v_size * nr)) {
7942b919 KS	85	ret = -EFAULT;
	86	break;
	87	}
	88	total += nr;
b028fcfc RK	89	if ((size_t)nr < n)
	90	break;
	91	if (pos == ppos)
	92	pos += n;
7942b919 KS	93	}
	94	argv->v_nmembs = total;
	95
3358b4aa	96	free_pages((unsigned long)buf, 0);
7942b919 KS	97	return ret;
	98	}
	99
	100	static int nilfs_ioctl_change_cpmode(struct inode inode, struct file filp,
	101	unsigned int cmd, void __user *argp)
	102	{
c1ea985c RK	103	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
c1ea985c RK	104	struct inode *cpfile = nilfs->ns_cpfile;
7942b919 KS	105	struct nilfs_transaction_info ti;
	106	struct nilfs_cpmode cpmode;
	107	int ret;
	108
	109	if (!capable(CAP_SYS_ADMIN))
	110	return -EPERM;
7512487e RK	111
	112	ret = mnt_want_write(filp->f_path.mnt);
	113	if (ret)
	114	return ret;
	115
	116	ret = -EFAULT;
7942b919	117	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
7512487e	118	goto out;
7942b919	119
c1ea985c	120	mutex_lock(&nilfs->ns_mount_mutex);
7512487e	121
7942b919 KS	122	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	123	ret = nilfs_cpfile_change_cpmode(
	124	cpfile, cpmode.cm_cno, cpmode.cm_mode);
7512487e	125	if (unlikely(ret < 0))
47420c79	126	nilfs_transaction_abort(inode->i_sb);
7512487e RK	127	else
	128	nilfs_transaction_commit(inode->i_sb); /* never fails */
	129
c1ea985c	130	mutex_unlock(&nilfs->ns_mount_mutex);
7512487e RK	131	out:
7512487e RK	132	mnt_drop_write(filp->f_path.mnt);
7942b919 KS	133	return ret;
	134	}
	135
	136	static int
	137	nilfs_ioctl_delete_checkpoint(struct inode inode, struct file filp,
	138	unsigned int cmd, void __user *argp)
	139	{
	140	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	141	struct nilfs_transaction_info ti;
	142	__u64 cno;
	143	int ret;
	144
	145	if (!capable(CAP_SYS_ADMIN))
	146	return -EPERM;
7512487e RK	147
	148	ret = mnt_want_write(filp->f_path.mnt);
	149	if (ret)
	150	return ret;
	151
	152	ret = -EFAULT;
7942b919	153	if (copy_from_user(&cno, argp, sizeof(cno)))
7512487e	154	goto out;
7942b919 KS	155
	156	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	157	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
7512487e	158	if (unlikely(ret < 0))
47420c79	159	nilfs_transaction_abort(inode->i_sb);
7512487e RK	160	else
	161	nilfs_transaction_commit(inode->i_sb); /* never fails */
	162	out:
	163	mnt_drop_write(filp->f_path.mnt);
7942b919 KS	164	return ret;
	165	}
	166
	167	static ssize_t
b028fcfc	168	nilfs_ioctl_do_get_cpinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	169	void *buf, size_t size, size_t nmembs)
7942b919 KS	170	{
7942b919 KS	171	int ret;
7942b919 KS	172
47420c79	173	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	174	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
003ff182	175	size, nmembs);
47420c79	176	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	177	return ret;
	178	}
	179
	180	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	181	unsigned int cmd, void __user *argp)
	182	{
47420c79	183	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	184	struct nilfs_cpstat cpstat;
7942b919 KS	185	int ret;
7942b919 KS	186
47420c79 RK	187	down_read(&nilfs->ns_segctor_sem);
	188	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	189	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	190	if (ret < 0)
	191	return ret;
	192
	193	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	194	ret = -EFAULT;
	195	return ret;
	196	}
	197
	198	static ssize_t
b028fcfc	199	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	200	void *buf, size_t size, size_t nmembs)
7942b919 KS	201	{
7942b919 KS	202	int ret;
7942b919 KS	203
47420c79	204	down_read(&nilfs->ns_segctor_sem);
003ff182 RK	205	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
003ff182 RK	206	nmembs);
47420c79	207	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	208	return ret;
	209	}
	210
	211	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	212	unsigned int cmd, void __user *argp)
	213	{
47420c79	214	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	215	struct nilfs_sustat sustat;
7942b919 KS	216	int ret;
7942b919 KS	217
47420c79 RK	218	down_read(&nilfs->ns_segctor_sem);
	219	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	220	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	221	if (ret < 0)
	222	return ret;
	223
	224	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	225	ret = -EFAULT;
	226	return ret;
	227	}
	228
	229	static ssize_t
b028fcfc	230	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	231	void *buf, size_t size, size_t nmembs)
7942b919 KS	232	{
7942b919 KS	233	int ret;
7942b919 KS	234
47420c79	235	down_read(&nilfs->ns_segctor_sem);
003ff182	236	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
47420c79	237	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	238	return ret;
	239	}
	240
	241	static ssize_t
b028fcfc	242	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	243	void *buf, size_t size, size_t nmembs)
	244	{
	245	struct inode *dat = nilfs_dat_inode(nilfs);
	246	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	247	struct nilfs_bdesc *bdescs = buf;
	248	int ret, i;
	249
47eb6b9c	250	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	251	for (i = 0; i < nmembs; i++) {
	252	ret = nilfs_bmap_lookup_at_level(bmap,
	253	bdescs[i].bd_offset,
	254	bdescs[i].bd_level + 1,
	255	&bdescs[i].bd_blocknr);
	256	if (ret < 0) {
47eb6b9c RK	257	if (ret != -ENOENT) {
47eb6b9c RK	258	up_read(&nilfs->ns_segctor_sem);
7942b919	259	return ret;
47eb6b9c	260	}
7942b919 KS	261	bdescs[i].bd_blocknr = 0;
	262	}
	263	}
47eb6b9c	264	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	265	return nmembs;
	266	}
	267
	268	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	269	unsigned int cmd, void __user *argp)
	270	{
	271	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	272	struct nilfs_argv argv;
7942b919 KS	273	int ret;
	274
	275	if (copy_from_user(&argv, argp, sizeof(argv)))
	276	return -EFAULT;
	277
83aca8f4 RK	278	if (argv.v_size != sizeof(struct nilfs_bdesc))
	279	return -EINVAL;
	280
7942b919 KS	281	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	282	nilfs_ioctl_do_get_bdescs);
47420c79 RK	283	if (ret < 0)
47420c79 RK	284	return ret;
7942b919 KS	285
	286	if (copy_to_user(argp, &argv, sizeof(argv)))
	287	ret = -EFAULT;
	288	return ret;
	289	}
	290
	291	static int nilfs_ioctl_move_inode_block(struct inode *inode,
	292	struct nilfs_vdesc *vdesc,
	293	struct list_head *buffers)
	294	{
	295	struct buffer_head *bh;
	296	int ret;
	297
	298	if (vdesc->vd_flags == 0)
	299	ret = nilfs_gccache_submit_read_data(
	300	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	301	vdesc->vd_vblocknr, &bh);
	302	else
	303	ret = nilfs_gccache_submit_read_node(
	304	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	305
	306	if (unlikely(ret < 0)) {
	307	if (ret == -ENOENT)
	308	printk(KERN_CRIT
	309	"%s: invalid virtual block address (%s): "
	310	"ino=%llu, cno=%llu, offset=%llu, "
	311	"blocknr=%llu, vblocknr=%llu\n",
	312	__func__, vdesc->vd_flags ? "node" : "data",
	313	(unsigned long long)vdesc->vd_ino,
	314	(unsigned long long)vdesc->vd_cno,
	315	(unsigned long long)vdesc->vd_offset,
	316	(unsigned long long)vdesc->vd_blocknr,
	317	(unsigned long long)vdesc->vd_vblocknr);
	318	return ret;
	319	}
5399dd1f RK	320	if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
	321	printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
	322	"cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
	323	__func__, vdesc->vd_flags ? "node" : "data",
	324	(unsigned long long)vdesc->vd_ino,
	325	(unsigned long long)vdesc->vd_cno,
	326	(unsigned long long)vdesc->vd_offset,
	327	(unsigned long long)vdesc->vd_blocknr,
	328	(unsigned long long)vdesc->vd_vblocknr);
	329	brelse(bh);
	330	return -EEXIST;
	331	}
7942b919 KS	332	list_add_tail(&bh->b_assoc_buffers, buffers);
	333	return 0;
	334	}
	335
4f6b8288 RK	336	static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
4f6b8288 RK	337	struct nilfs_argv argv, void buf)
7942b919	338	{
4f6b8288	339	size_t nmembs = argv->v_nmembs;
7942b919 KS	340	struct inode *inode;
	341	struct nilfs_vdesc *vdesc;
	342	struct buffer_head bh, n;
	343	LIST_HEAD(buffers);
	344	ino_t ino;
	345	__u64 cno;
	346	int i, ret;
	347
	348	for (i = 0, vdesc = buf; i < nmembs; ) {
	349	ino = vdesc->vd_ino;
	350	cno = vdesc->vd_cno;
	351	inode = nilfs_gc_iget(nilfs, ino, cno);
	352	if (unlikely(inode == NULL)) {
	353	ret = -ENOMEM;
	354	goto failed;
	355	}
	356	do {
	357	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	358	&buffers);
	359	if (unlikely(ret < 0))
	360	goto failed;
	361	vdesc++;
	362	} while (++i < nmembs &&
	363	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	364	}
	365
	366	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	367	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	368	if (unlikely(ret < 0)) {
5399dd1f	369	WARN_ON(ret == -EEXIST);
7942b919 KS	370	goto failed;
	371	}
	372	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	373	brelse(bh);
	374	}
	375	return nmembs;
	376
	377	failed:
	378	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	379	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	380	brelse(bh);
	381	}
	382	return ret;
	383	}
	384
4f6b8288 RK	385	static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
4f6b8288 RK	386	struct nilfs_argv argv, void buf)
7942b919	387	{
4f6b8288	388	size_t nmembs = argv->v_nmembs;
7942b919 KS	389	struct inode *cpfile = nilfs->ns_cpfile;
	390	struct nilfs_period *periods = buf;
	391	int ret, i;
	392
	393	for (i = 0; i < nmembs; i++) {
	394	ret = nilfs_cpfile_delete_checkpoints(
	395	cpfile, periods[i].p_start, periods[i].p_end);
	396	if (ret < 0)
	397	return ret;
	398	}
	399	return nmembs;
	400	}
	401
4f6b8288 RK	402	static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
4f6b8288 RK	403	struct nilfs_argv argv, void buf)
7942b919	404	{
4f6b8288 RK	405	size_t nmembs = argv->v_nmembs;
4f6b8288 RK	406	int ret;
7942b919	407
4f6b8288	408	ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
7942b919 KS	409
	410	return (ret < 0) ? ret : nmembs;
	411	}
	412
4f6b8288 RK	413	static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
4f6b8288 RK	414	struct nilfs_argv argv, void buf)
7942b919	415	{
4f6b8288	416	size_t nmembs = argv->v_nmembs;
7942b919 KS	417	struct inode *dat = nilfs_dat_inode(nilfs);
	418	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	419	struct nilfs_bdesc *bdescs = buf;
	420	int ret, i;
	421
	422	for (i = 0; i < nmembs; i++) {
	423	/* XXX: use macro or inline func to check liveness */
	424	ret = nilfs_bmap_lookup_at_level(bmap,
	425	bdescs[i].bd_offset,
	426	bdescs[i].bd_level + 1,
	427	&bdescs[i].bd_blocknr);
	428	if (ret < 0) {
	429	if (ret != -ENOENT)
	430	return ret;
	431	bdescs[i].bd_blocknr = 0;
	432	}
	433	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	434	/* skip dead block */
	435	continue;
	436	if (bdescs[i].bd_level == 0) {
	437	ret = nilfs_mdt_mark_block_dirty(dat,
	438	bdescs[i].bd_offset);
	439	if (ret < 0) {
1f5abe7e	440	WARN_ON(ret == -ENOENT);
7942b919 KS	441	return ret;
	442	}
	443	} else {
	444	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	445	bdescs[i].bd_level);
	446	if (ret < 0) {
1f5abe7e	447	WARN_ON(ret == -ENOENT);
7942b919 KS	448	return ret;
	449	}
	450	}
	451	}
	452	return nmembs;
	453	}
	454
7942b919	455	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
4f6b8288	456	struct nilfs_argv argv, void *kbufs)
7942b919	457	{
1f5abe7e	458	const char *msg;
4f6b8288	459	int ret;
7942b919	460
4f6b8288	461	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
1f5abe7e RK	462	if (ret < 0) {
	463	/*
	464	* can safely abort because checkpoints can be removed
	465	* independently.
	466	*/
	467	msg = "cannot delete checkpoints";
	468	goto failed;
	469	}
4f6b8288	470	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
1f5abe7e RK	471	if (ret < 0) {
	472	/*
	473	* can safely abort because DAT file is updated atomically
	474	* using a copy-on-write technique.
	475	*/
	476	msg = "cannot delete virtual blocks from DAT file";
	477	goto failed;
	478	}
4f6b8288	479	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
1f5abe7e RK	480	if (ret < 0) {
	481	/*
	482	* can safely abort because the operation is nondestructive.
	483	*/
	484	msg = "cannot mark copying blocks dirty";
	485	goto failed;
	486	}
7942b919 KS	487	return 0;
7942b919 KS	488
1f5abe7e	489	failed:
1f5abe7e RK	490	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	491	msg, ret);
7942b919 KS	492	return ret;
	493	}
	494
	495	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	496	unsigned int cmd, void __user *argp)
	497	{
4f6b8288	498	struct nilfs_argv argv[5];
33e189bd	499	static const size_t argsz[5] = {
4f6b8288 RK	500	sizeof(struct nilfs_vdesc),
	501	sizeof(struct nilfs_period),
	502	sizeof(__u64),
	503	sizeof(struct nilfs_bdesc),
	504	sizeof(__u64),
	505	};
	506	void __user *base;
	507	void *kbufs[5];
	508	struct the_nilfs *nilfs;
	509	size_t len, nsegs;
	510	int n, ret;
	511
7942b919 KS	512	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	513	return -EPERM;
4f6b8288	514
7512487e RK	515	ret = mnt_want_write(filp->f_path.mnt);
	516	if (ret)
	517	return ret;
	518
	519	ret = -EFAULT;
4f6b8288	520	if (copy_from_user(argv, argp, sizeof(argv)))
7512487e	521	goto out;
4f6b8288	522
7512487e	523	ret = -EINVAL;
4f6b8288 RK	524	nsegs = argv[4].v_nmembs;
4f6b8288 RK	525	if (argv[4].v_size != argsz[4])
7512487e RK	526	goto out;
7512487e RK	527
4f6b8288 RK	528	/*
	529	* argv[4] points to segment numbers this ioctl cleans. We
	530	* use kmalloc() for its buffer because memory used for the
	531	* segment numbers is enough small.
	532	*/
	533	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
	534	nsegs * sizeof(__u64));
7512487e RK	535	if (IS_ERR(kbufs[4])) {
	536	ret = PTR_ERR(kbufs[4]);
	537	goto out;
	538	}
4f6b8288 RK	539	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	540
	541	for (n = 0; n < 4; n++) {
	542	ret = -EINVAL;
	543	if (argv[n].v_size != argsz[n])
	544	goto out_free;
	545
	546	if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
	547	goto out_free;
	548
	549	len = argv[n].v_size * argv[n].v_nmembs;
	550	base = (void __user *)(unsigned long)argv[n].v_base;
	551	if (len == 0) {
	552	kbufs[n] = NULL;
	553	continue;
	554	}
	555
	556	kbufs[n] = vmalloc(len);
	557	if (!kbufs[n]) {
	558	ret = -ENOMEM;
	559	goto out_free;
	560	}
	561	if (copy_from_user(kbufs[n], base, len)) {
	562	ret = -EFAULT;
	563	vfree(kbufs[n]);
	564	goto out_free;
	565	}
	566	}
	567
1cf58fa8 JS	568	/*
	569	* nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
	570	* which will operates an inode list without blocking.
	571	* To protect the list from concurrent operations,
	572	* nilfs_ioctl_move_blocks should be atomic operation.
	573	*/
	574	if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
	575	ret = -EBUSY;
	576	goto out_free;
	577	}
	578
	579	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
	580	if (ret < 0)
	581	printk(KERN_ERR "NILFS: GC failed during preparation: "
	582	"cannot read source blocks: err=%d\n", ret);
	583	else
	584	ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
	585
c083234f RK	586	if (ret < 0)
c083234f RK	587	nilfs_remove_all_gcinode(nilfs);
1cf58fa8	588	clear_nilfs_gc_running(nilfs);
4f6b8288	589
7512487e	590	out_free:
d5046853	591	while (--n >= 0)
4f6b8288 RK	592	vfree(kbufs[n]);
4f6b8288 RK	593	kfree(kbufs[4]);
7512487e RK	594	out:
7512487e RK	595	mnt_drop_write(filp->f_path.mnt);
4f6b8288	596	return ret;
7942b919 KS	597	}
	598
	599	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	600	unsigned int cmd, void __user *argp)
	601	{
	602	__u64 cno;
	603	int ret;
0d561f12	604	struct the_nilfs *nilfs;
7942b919 KS	605
	606	ret = nilfs_construct_segment(inode->i_sb);
	607	if (ret < 0)
	608	return ret;
	609
	610	if (argp != NULL) {
0d561f12 JS	611	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	612	down_read(&nilfs->ns_segctor_sem);
	613	cno = nilfs->ns_cno - 1;
	614	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	615	if (copy_to_user(argp, &cno, sizeof(cno)))
	616	return -EFAULT;
	617	}
	618	return 0;
	619	}
	620
47eb6b9c RK	621	static int nilfs_ioctl_get_info(struct inode inode, struct file filp,
47eb6b9c RK	622	unsigned int cmd, void __user *argp,
83aca8f4	623	size_t membsz,
47eb6b9c RK	624	ssize_t (dofunc)(struct the_nilfs ,
	625	__u64 *, int,
	626	void *, size_t, size_t))
	627
	628	{
	629	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	630	struct nilfs_argv argv;
	631	int ret;
	632
	633	if (copy_from_user(&argv, argp, sizeof(argv)))
	634	return -EFAULT;
	635
003ff182	636	if (argv.v_size < membsz)
83aca8f4 RK	637	return -EINVAL;
83aca8f4 RK	638
47eb6b9c RK	639	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	640	if (ret < 0)
	641	return ret;
	642
	643	if (copy_to_user(argp, &argv, sizeof(argv)))
	644	ret = -EFAULT;
	645	return ret;
	646	}
	647
7a946193	648	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	649	{
7a946193	650	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	651	void __user argp = (void __user *)arg;
	652
	653	switch (cmd) {
	654	case NILFS_IOCTL_CHANGE_CPMODE:
	655	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	656	case NILFS_IOCTL_DELETE_CHECKPOINT:
	657	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	658	case NILFS_IOCTL_GET_CPINFO:
47eb6b9c	659	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	660	sizeof(struct nilfs_cpinfo),
47eb6b9c	661	nilfs_ioctl_do_get_cpinfo);
7942b919 KS	662	case NILFS_IOCTL_GET_CPSTAT:
	663	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	664	case NILFS_IOCTL_GET_SUINFO:
47eb6b9c	665	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	666	sizeof(struct nilfs_suinfo),
47eb6b9c	667	nilfs_ioctl_do_get_suinfo);
7942b919 KS	668	case NILFS_IOCTL_GET_SUSTAT:
	669	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	670	case NILFS_IOCTL_GET_VINFO:
47eb6b9c	671	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	672	sizeof(struct nilfs_vinfo),
47eb6b9c	673	nilfs_ioctl_do_get_vinfo);
7942b919 KS	674	case NILFS_IOCTL_GET_BDESCS:
	675	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	676	case NILFS_IOCTL_CLEAN_SEGMENTS:
	677	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	678	case NILFS_IOCTL_SYNC:
	679	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	680	default:
	681	return -ENOTTY;
	682	}
	683	}