[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/slab.h>
#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() */
5a0e3ad6	26	#include <linux/slab.h>
7942b919 KS	27	#include <linux/capability.h> /* capable() */
7942b919 KS	28	#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
4f6b8288	29	#include <linux/vmalloc.h>
7512487e	30	#include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */
7942b919 KS	31	#include <linux/nilfs2_fs.h>
	32	#include "nilfs.h"
	33	#include "segment.h"
	34	#include "bmap.h"
	35	#include "cpfile.h"
	36	#include "sufile.h"
	37	#include "dat.h"
	38
	39
7942b919 KS	40	static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
	41	struct nilfs_argv *argv, int dir,
	42	ssize_t (dofunc)(struct the_nilfs ,
b028fcfc	43	__u64 *, int,
7942b919 KS	44	void *, size_t, size_t))
	45	{
	46	void *buf;
dc498d09	47	void __user base = (void __user )(unsigned long)argv->v_base;
3358b4aa	48	size_t maxmembs, total, n;
7942b919 KS	49	ssize_t nr;
7942b919 KS	50	int ret, i;
b028fcfc	51	__u64 pos, ppos;
7942b919 KS	52
	53	if (argv->v_nmembs == 0)
	54	return 0;
	55
3358b4aa RK	56	if (argv->v_size > PAGE_SIZE)
	57	return -EINVAL;
	58
	59	buf = (void *)__get_free_pages(GFP_NOFS, 0);
	60	if (unlikely(!buf))
7942b919	61	return -ENOMEM;
3358b4aa	62	maxmembs = PAGE_SIZE / argv->v_size;
7942b919 KS	63
	64	ret = 0;
	65	total = 0;
b028fcfc	66	pos = argv->v_index;
7942b919 KS	67	for (i = 0; i < argv->v_nmembs; i += n) {
	68	n = (argv->v_nmembs - i < maxmembs) ?
	69	argv->v_nmembs - i : maxmembs;
	70	if ((dir & _IOC_WRITE) &&
dc498d09 RK	71	copy_from_user(buf, base + argv->v_size * i,
dc498d09 RK	72	argv->v_size * n)) {
7942b919 KS	73	ret = -EFAULT;
	74	break;
	75	}
b028fcfc	76	ppos = pos;
8acfbf09	77	nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
b028fcfc	78	n);
7942b919 KS	79	if (nr < 0) {
	80	ret = nr;
	81	break;
	82	}
	83	if ((dir & _IOC_READ) &&
dc498d09 RK	84	copy_to_user(base + argv->v_size * i, buf,
dc498d09 RK	85	argv->v_size * nr)) {
7942b919 KS	86	ret = -EFAULT;
	87	break;
	88	}
	89	total += nr;
b028fcfc RK	90	if ((size_t)nr < n)
	91	break;
	92	if (pos == ppos)
	93	pos += n;
7942b919 KS	94	}
	95	argv->v_nmembs = total;
	96
3358b4aa	97	free_pages((unsigned long)buf, 0);
7942b919 KS	98	return ret;
	99	}
	100
	101	static int nilfs_ioctl_change_cpmode(struct inode inode, struct file filp,
	102	unsigned int cmd, void __user *argp)
	103	{
c1ea985c RK	104	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
c1ea985c RK	105	struct inode *cpfile = nilfs->ns_cpfile;
7942b919 KS	106	struct nilfs_transaction_info ti;
	107	struct nilfs_cpmode cpmode;
	108	int ret;
	109
	110	if (!capable(CAP_SYS_ADMIN))
	111	return -EPERM;
7512487e RK	112
	113	ret = mnt_want_write(filp->f_path.mnt);
	114	if (ret)
	115	return ret;
	116
	117	ret = -EFAULT;
7942b919	118	if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
7512487e	119	goto out;
7942b919	120
c1ea985c	121	mutex_lock(&nilfs->ns_mount_mutex);
7512487e	122
7942b919 KS	123	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	124	ret = nilfs_cpfile_change_cpmode(
	125	cpfile, cpmode.cm_cno, cpmode.cm_mode);
7512487e	126	if (unlikely(ret < 0))
47420c79	127	nilfs_transaction_abort(inode->i_sb);
7512487e RK	128	else
	129	nilfs_transaction_commit(inode->i_sb); /* never fails */
	130
c1ea985c	131	mutex_unlock(&nilfs->ns_mount_mutex);
7512487e RK	132	out:
7512487e RK	133	mnt_drop_write(filp->f_path.mnt);
7942b919 KS	134	return ret;
	135	}
	136
	137	static int
	138	nilfs_ioctl_delete_checkpoint(struct inode inode, struct file filp,
	139	unsigned int cmd, void __user *argp)
	140	{
	141	struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
	142	struct nilfs_transaction_info ti;
	143	__u64 cno;
	144	int ret;
	145
	146	if (!capable(CAP_SYS_ADMIN))
	147	return -EPERM;
7512487e RK	148
	149	ret = mnt_want_write(filp->f_path.mnt);
	150	if (ret)
	151	return ret;
	152
	153	ret = -EFAULT;
7942b919	154	if (copy_from_user(&cno, argp, sizeof(cno)))
7512487e	155	goto out;
7942b919 KS	156
	157	nilfs_transaction_begin(inode->i_sb, &ti, 0);
	158	ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
7512487e	159	if (unlikely(ret < 0))
47420c79	160	nilfs_transaction_abort(inode->i_sb);
7512487e RK	161	else
	162	nilfs_transaction_commit(inode->i_sb); /* never fails */
	163	out:
	164	mnt_drop_write(filp->f_path.mnt);
7942b919 KS	165	return ret;
	166	}
	167
	168	static ssize_t
b028fcfc	169	nilfs_ioctl_do_get_cpinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	170	void *buf, size_t size, size_t nmembs)
7942b919 KS	171	{
7942b919 KS	172	int ret;
7942b919 KS	173
47420c79	174	down_read(&nilfs->ns_segctor_sem);
47eb6b9c	175	ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
003ff182	176	size, nmembs);
47420c79	177	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	178	return ret;
	179	}
	180
	181	static int nilfs_ioctl_get_cpstat(struct inode inode, struct file filp,
	182	unsigned int cmd, void __user *argp)
	183	{
47420c79	184	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	185	struct nilfs_cpstat cpstat;
7942b919 KS	186	int ret;
7942b919 KS	187
47420c79 RK	188	down_read(&nilfs->ns_segctor_sem);
	189	ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
	190	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	191	if (ret < 0)
	192	return ret;
	193
	194	if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
	195	ret = -EFAULT;
	196	return ret;
	197	}
	198
	199	static ssize_t
b028fcfc	200	nilfs_ioctl_do_get_suinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	201	void *buf, size_t size, size_t nmembs)
7942b919 KS	202	{
7942b919 KS	203	int ret;
7942b919 KS	204
47420c79	205	down_read(&nilfs->ns_segctor_sem);
003ff182 RK	206	ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
003ff182 RK	207	nmembs);
47420c79	208	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	209	return ret;
	210	}
	211
	212	static int nilfs_ioctl_get_sustat(struct inode inode, struct file filp,
	213	unsigned int cmd, void __user *argp)
	214	{
47420c79	215	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
7942b919	216	struct nilfs_sustat sustat;
7942b919 KS	217	int ret;
7942b919 KS	218
47420c79 RK	219	down_read(&nilfs->ns_segctor_sem);
	220	ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
	221	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	222	if (ret < 0)
	223	return ret;
	224
	225	if (copy_to_user(argp, &sustat, sizeof(sustat)))
	226	ret = -EFAULT;
	227	return ret;
	228	}
	229
	230	static ssize_t
b028fcfc	231	nilfs_ioctl_do_get_vinfo(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	232	void *buf, size_t size, size_t nmembs)
7942b919 KS	233	{
7942b919 KS	234	int ret;
7942b919 KS	235
47420c79	236	down_read(&nilfs->ns_segctor_sem);
003ff182	237	ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
47420c79	238	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	239	return ret;
	240	}
	241
	242	static ssize_t
b028fcfc	243	nilfs_ioctl_do_get_bdescs(struct the_nilfs nilfs, __u64 posp, int flags,
7942b919 KS	244	void *buf, size_t size, size_t nmembs)
	245	{
	246	struct inode *dat = nilfs_dat_inode(nilfs);
	247	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	248	struct nilfs_bdesc *bdescs = buf;
	249	int ret, i;
	250
47eb6b9c	251	down_read(&nilfs->ns_segctor_sem);
7942b919 KS	252	for (i = 0; i < nmembs; i++) {
	253	ret = nilfs_bmap_lookup_at_level(bmap,
	254	bdescs[i].bd_offset,
	255	bdescs[i].bd_level + 1,
	256	&bdescs[i].bd_blocknr);
	257	if (ret < 0) {
47eb6b9c RK	258	if (ret != -ENOENT) {
47eb6b9c RK	259	up_read(&nilfs->ns_segctor_sem);
7942b919	260	return ret;
47eb6b9c	261	}
7942b919 KS	262	bdescs[i].bd_blocknr = 0;
	263	}
	264	}
47eb6b9c	265	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	266	return nmembs;
	267	}
	268
	269	static int nilfs_ioctl_get_bdescs(struct inode inode, struct file filp,
	270	unsigned int cmd, void __user *argp)
	271	{
	272	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	273	struct nilfs_argv argv;
7942b919 KS	274	int ret;
	275
	276	if (copy_from_user(&argv, argp, sizeof(argv)))
	277	return -EFAULT;
	278
83aca8f4 RK	279	if (argv.v_size != sizeof(struct nilfs_bdesc))
	280	return -EINVAL;
	281
7942b919 KS	282	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
7942b919 KS	283	nilfs_ioctl_do_get_bdescs);
47420c79 RK	284	if (ret < 0)
47420c79 RK	285	return ret;
7942b919 KS	286
	287	if (copy_to_user(argp, &argv, sizeof(argv)))
	288	ret = -EFAULT;
	289	return ret;
	290	}
	291
	292	static int nilfs_ioctl_move_inode_block(struct inode *inode,
	293	struct nilfs_vdesc *vdesc,
	294	struct list_head *buffers)
	295	{
	296	struct buffer_head *bh;
	297	int ret;
	298
	299	if (vdesc->vd_flags == 0)
	300	ret = nilfs_gccache_submit_read_data(
	301	inode, vdesc->vd_offset, vdesc->vd_blocknr,
	302	vdesc->vd_vblocknr, &bh);
	303	else
	304	ret = nilfs_gccache_submit_read_node(
	305	inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
	306
	307	if (unlikely(ret < 0)) {
	308	if (ret == -ENOENT)
	309	printk(KERN_CRIT
	310	"%s: invalid virtual block address (%s): "
	311	"ino=%llu, cno=%llu, offset=%llu, "
	312	"blocknr=%llu, vblocknr=%llu\n",
	313	__func__, vdesc->vd_flags ? "node" : "data",
	314	(unsigned long long)vdesc->vd_ino,
	315	(unsigned long long)vdesc->vd_cno,
	316	(unsigned long long)vdesc->vd_offset,
	317	(unsigned long long)vdesc->vd_blocknr,
	318	(unsigned long long)vdesc->vd_vblocknr);
	319	return ret;
	320	}
5399dd1f RK	321	if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
	322	printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
	323	"cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
	324	__func__, vdesc->vd_flags ? "node" : "data",
	325	(unsigned long long)vdesc->vd_ino,
	326	(unsigned long long)vdesc->vd_cno,
	327	(unsigned long long)vdesc->vd_offset,
	328	(unsigned long long)vdesc->vd_blocknr,
	329	(unsigned long long)vdesc->vd_vblocknr);
	330	brelse(bh);
	331	return -EEXIST;
	332	}
7942b919 KS	333	list_add_tail(&bh->b_assoc_buffers, buffers);
	334	return 0;
	335	}
	336
4f6b8288 RK	337	static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
4f6b8288 RK	338	struct nilfs_argv argv, void buf)
7942b919	339	{
4f6b8288	340	size_t nmembs = argv->v_nmembs;
7942b919 KS	341	struct inode *inode;
	342	struct nilfs_vdesc *vdesc;
	343	struct buffer_head bh, n;
	344	LIST_HEAD(buffers);
	345	ino_t ino;
	346	__u64 cno;
	347	int i, ret;
	348
	349	for (i = 0, vdesc = buf; i < nmembs; ) {
	350	ino = vdesc->vd_ino;
	351	cno = vdesc->vd_cno;
	352	inode = nilfs_gc_iget(nilfs, ino, cno);
	353	if (unlikely(inode == NULL)) {
	354	ret = -ENOMEM;
	355	goto failed;
	356	}
	357	do {
	358	ret = nilfs_ioctl_move_inode_block(inode, vdesc,
	359	&buffers);
	360	if (unlikely(ret < 0))
	361	goto failed;
	362	vdesc++;
	363	} while (++i < nmembs &&
	364	vdesc->vd_ino == ino && vdesc->vd_cno == cno);
	365	}
	366
	367	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	368	ret = nilfs_gccache_wait_and_mark_dirty(bh);
	369	if (unlikely(ret < 0)) {
5399dd1f	370	WARN_ON(ret == -EEXIST);
7942b919 KS	371	goto failed;
	372	}
	373	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	374	brelse(bh);
	375	}
	376	return nmembs;
	377
	378	failed:
	379	list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
	380	list_del_init(&bh->b_assoc_buffers);
7942b919 KS	381	brelse(bh);
	382	}
	383	return ret;
	384	}
	385
4f6b8288 RK	386	static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
4f6b8288 RK	387	struct nilfs_argv argv, void buf)
7942b919	388	{
4f6b8288	389	size_t nmembs = argv->v_nmembs;
7942b919 KS	390	struct inode *cpfile = nilfs->ns_cpfile;
	391	struct nilfs_period *periods = buf;
	392	int ret, i;
	393
	394	for (i = 0; i < nmembs; i++) {
	395	ret = nilfs_cpfile_delete_checkpoints(
	396	cpfile, periods[i].p_start, periods[i].p_end);
	397	if (ret < 0)
	398	return ret;
	399	}
	400	return nmembs;
	401	}
	402
4f6b8288 RK	403	static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
4f6b8288 RK	404	struct nilfs_argv argv, void buf)
7942b919	405	{
4f6b8288 RK	406	size_t nmembs = argv->v_nmembs;
4f6b8288 RK	407	int ret;
7942b919	408
4f6b8288	409	ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
7942b919 KS	410
	411	return (ret < 0) ? ret : nmembs;
	412	}
	413
4f6b8288 RK	414	static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
4f6b8288 RK	415	struct nilfs_argv argv, void buf)
7942b919	416	{
4f6b8288	417	size_t nmembs = argv->v_nmembs;
7942b919 KS	418	struct inode *dat = nilfs_dat_inode(nilfs);
	419	struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
	420	struct nilfs_bdesc *bdescs = buf;
	421	int ret, i;
	422
	423	for (i = 0; i < nmembs; i++) {
	424	/* XXX: use macro or inline func to check liveness */
	425	ret = nilfs_bmap_lookup_at_level(bmap,
	426	bdescs[i].bd_offset,
	427	bdescs[i].bd_level + 1,
	428	&bdescs[i].bd_blocknr);
	429	if (ret < 0) {
	430	if (ret != -ENOENT)
	431	return ret;
	432	bdescs[i].bd_blocknr = 0;
	433	}
	434	if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
	435	/* skip dead block */
	436	continue;
	437	if (bdescs[i].bd_level == 0) {
	438	ret = nilfs_mdt_mark_block_dirty(dat,
	439	bdescs[i].bd_offset);
	440	if (ret < 0) {
1f5abe7e	441	WARN_ON(ret == -ENOENT);
7942b919 KS	442	return ret;
	443	}
	444	} else {
	445	ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
	446	bdescs[i].bd_level);
	447	if (ret < 0) {
1f5abe7e	448	WARN_ON(ret == -ENOENT);
7942b919 KS	449	return ret;
	450	}
	451	}
	452	}
	453	return nmembs;
	454	}
	455
7942b919	456	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
4f6b8288	457	struct nilfs_argv argv, void *kbufs)
7942b919	458	{
1f5abe7e	459	const char *msg;
4f6b8288	460	int ret;
7942b919	461
4f6b8288	462	ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
1f5abe7e RK	463	if (ret < 0) {
	464	/*
	465	* can safely abort because checkpoints can be removed
	466	* independently.
	467	*/
	468	msg = "cannot delete checkpoints";
	469	goto failed;
	470	}
4f6b8288	471	ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
1f5abe7e RK	472	if (ret < 0) {
	473	/*
	474	* can safely abort because DAT file is updated atomically
	475	* using a copy-on-write technique.
	476	*/
	477	msg = "cannot delete virtual blocks from DAT file";
	478	goto failed;
	479	}
4f6b8288	480	ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
1f5abe7e RK	481	if (ret < 0) {
	482	/*
	483	* can safely abort because the operation is nondestructive.
	484	*/
	485	msg = "cannot mark copying blocks dirty";
	486	goto failed;
	487	}
7942b919 KS	488	return 0;
7942b919 KS	489
1f5abe7e	490	failed:
1f5abe7e RK	491	printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
1f5abe7e RK	492	msg, ret);
7942b919 KS	493	return ret;
	494	}
	495
	496	static int nilfs_ioctl_clean_segments(struct inode inode, struct file filp,
	497	unsigned int cmd, void __user *argp)
	498	{
4f6b8288	499	struct nilfs_argv argv[5];
33e189bd	500	static const size_t argsz[5] = {
4f6b8288 RK	501	sizeof(struct nilfs_vdesc),
	502	sizeof(struct nilfs_period),
	503	sizeof(__u64),
	504	sizeof(struct nilfs_bdesc),
	505	sizeof(__u64),
	506	};
	507	void __user *base;
	508	void *kbufs[5];
	509	struct the_nilfs *nilfs;
	510	size_t len, nsegs;
	511	int n, ret;
	512
7942b919 KS	513	if (!capable(CAP_SYS_ADMIN))
7942b919 KS	514	return -EPERM;
4f6b8288	515
7512487e RK	516	ret = mnt_want_write(filp->f_path.mnt);
	517	if (ret)
	518	return ret;
	519
	520	ret = -EFAULT;
4f6b8288	521	if (copy_from_user(argv, argp, sizeof(argv)))
7512487e	522	goto out;
4f6b8288	523
7512487e	524	ret = -EINVAL;
4f6b8288 RK	525	nsegs = argv[4].v_nmembs;
4f6b8288 RK	526	if (argv[4].v_size != argsz[4])
7512487e RK	527	goto out;
7512487e RK	528
4f6b8288 RK	529	/*
	530	* argv[4] points to segment numbers this ioctl cleans. We
	531	* use kmalloc() for its buffer because memory used for the
	532	* segment numbers is enough small.
	533	*/
	534	kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
	535	nsegs * sizeof(__u64));
7512487e RK	536	if (IS_ERR(kbufs[4])) {
	537	ret = PTR_ERR(kbufs[4]);
	538	goto out;
	539	}
4f6b8288 RK	540	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	541
	542	for (n = 0; n < 4; n++) {
	543	ret = -EINVAL;
	544	if (argv[n].v_size != argsz[n])
	545	goto out_free;
	546
	547	if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
	548	goto out_free;
	549
	550	len = argv[n].v_size * argv[n].v_nmembs;
	551	base = (void __user *)(unsigned long)argv[n].v_base;
	552	if (len == 0) {
	553	kbufs[n] = NULL;
	554	continue;
	555	}
	556
	557	kbufs[n] = vmalloc(len);
	558	if (!kbufs[n]) {
	559	ret = -ENOMEM;
	560	goto out_free;
	561	}
	562	if (copy_from_user(kbufs[n], base, len)) {
	563	ret = -EFAULT;
	564	vfree(kbufs[n]);
	565	goto out_free;
	566	}
	567	}
	568
1cf58fa8 JS	569	/*
	570	* nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
	571	* which will operates an inode list without blocking.
	572	* To protect the list from concurrent operations,
	573	* nilfs_ioctl_move_blocks should be atomic operation.
	574	*/
	575	if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
	576	ret = -EBUSY;
	577	goto out_free;
	578	}
	579
	580	ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
	581	if (ret < 0)
	582	printk(KERN_ERR "NILFS: GC failed during preparation: "
	583	"cannot read source blocks: err=%d\n", ret);
	584	else
	585	ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
	586
c083234f RK	587	if (ret < 0)
c083234f RK	588	nilfs_remove_all_gcinode(nilfs);
1cf58fa8	589	clear_nilfs_gc_running(nilfs);
4f6b8288	590
7512487e	591	out_free:
d5046853	592	while (--n >= 0)
4f6b8288 RK	593	vfree(kbufs[n]);
4f6b8288 RK	594	kfree(kbufs[4]);
7512487e RK	595	out:
7512487e RK	596	mnt_drop_write(filp->f_path.mnt);
4f6b8288	597	return ret;
7942b919 KS	598	}
	599
	600	static int nilfs_ioctl_sync(struct inode inode, struct file filp,
	601	unsigned int cmd, void __user *argp)
	602	{
	603	__u64 cno;
	604	int ret;
0d561f12	605	struct the_nilfs *nilfs;
7942b919 KS	606
	607	ret = nilfs_construct_segment(inode->i_sb);
	608	if (ret < 0)
	609	return ret;
	610
	611	if (argp != NULL) {
0d561f12 JS	612	nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	613	down_read(&nilfs->ns_segctor_sem);
	614	cno = nilfs->ns_cno - 1;
	615	up_read(&nilfs->ns_segctor_sem);
7942b919 KS	616	if (copy_to_user(argp, &cno, sizeof(cno)))
	617	return -EFAULT;
	618	}
	619	return 0;
	620	}
	621
47eb6b9c RK	622	static int nilfs_ioctl_get_info(struct inode inode, struct file filp,
47eb6b9c RK	623	unsigned int cmd, void __user *argp,
83aca8f4	624	size_t membsz,
47eb6b9c RK	625	ssize_t (dofunc)(struct the_nilfs ,
	626	__u64 *, int,
	627	void *, size_t, size_t))
	628
	629	{
	630	struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
	631	struct nilfs_argv argv;
	632	int ret;
	633
	634	if (copy_from_user(&argv, argp, sizeof(argv)))
	635	return -EFAULT;
	636
003ff182	637	if (argv.v_size < membsz)
83aca8f4 RK	638	return -EINVAL;
83aca8f4 RK	639
47eb6b9c RK	640	ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
	641	if (ret < 0)
	642	return ret;
	643
	644	if (copy_to_user(argp, &argv, sizeof(argv)))
	645	ret = -EFAULT;
	646	return ret;
	647	}
	648
7a946193	649	long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919	650	{
7a946193	651	struct inode *inode = filp->f_dentry->d_inode;
7942b919 KS	652	void __user argp = (void __user *)arg;
	653
	654	switch (cmd) {
	655	case NILFS_IOCTL_CHANGE_CPMODE:
	656	return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
	657	case NILFS_IOCTL_DELETE_CHECKPOINT:
	658	return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
	659	case NILFS_IOCTL_GET_CPINFO:
47eb6b9c	660	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	661	sizeof(struct nilfs_cpinfo),
47eb6b9c	662	nilfs_ioctl_do_get_cpinfo);
7942b919 KS	663	case NILFS_IOCTL_GET_CPSTAT:
	664	return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
	665	case NILFS_IOCTL_GET_SUINFO:
47eb6b9c	666	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	667	sizeof(struct nilfs_suinfo),
47eb6b9c	668	nilfs_ioctl_do_get_suinfo);
7942b919 KS	669	case NILFS_IOCTL_GET_SUSTAT:
	670	return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
	671	case NILFS_IOCTL_GET_VINFO:
47eb6b9c	672	return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4	673	sizeof(struct nilfs_vinfo),
47eb6b9c	674	nilfs_ioctl_do_get_vinfo);
7942b919 KS	675	case NILFS_IOCTL_GET_BDESCS:
	676	return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
	677	case NILFS_IOCTL_CLEAN_SEGMENTS:
	678	return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
7942b919 KS	679	case NILFS_IOCTL_SYNC:
	680	return nilfs_ioctl_sync(inode, filp, cmd, argp);
	681	default:
	682	return -ENOTTY;
	683	}
	684	}