ioctl.c 89.3 KB
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C
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/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/bio.h>
#include <linux/buffer_head.h>
#include <linux/file.h>
#include <linux/fs.h>
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#include <linux/fsnotify.h>
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#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
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#include <linux/mount.h>
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#include <linux/mpage.h>
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#include <linux/namei.h>
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#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
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#include <linux/security.h>
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#include <linux/xattr.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/uuid.h>
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#include "compat.h"
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#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "ioctl.h"
#include "print-tree.h"
#include "volumes.h"
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#include "locking.h"
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#include "inode-map.h"
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#include "backref.h"
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#include "rcu-string.h"
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#include "send.h"
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/* Mask out flags that are inappropriate for the given type of inode. */
static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
{
	if (S_ISDIR(mode))
		return flags;
	else if (S_ISREG(mode))
		return flags & ~FS_DIRSYNC_FL;
	else
		return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
}

/*
 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
 */
static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
{
	unsigned int iflags = 0;

	if (flags & BTRFS_INODE_SYNC)
		iflags |= FS_SYNC_FL;
	if (flags & BTRFS_INODE_IMMUTABLE)
		iflags |= FS_IMMUTABLE_FL;
	if (flags & BTRFS_INODE_APPEND)
		iflags |= FS_APPEND_FL;
	if (flags & BTRFS_INODE_NODUMP)
		iflags |= FS_NODUMP_FL;
	if (flags & BTRFS_INODE_NOATIME)
		iflags |= FS_NOATIME_FL;
	if (flags & BTRFS_INODE_DIRSYNC)
		iflags |= FS_DIRSYNC_FL;
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	if (flags & BTRFS_INODE_NODATACOW)
		iflags |= FS_NOCOW_FL;

	if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
		iflags |= FS_COMPR_FL;
	else if (flags & BTRFS_INODE_NOCOMPRESS)
		iflags |= FS_NOCOMP_FL;
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	return iflags;
}

/*
 * Update inode->i_flags based on the btrfs internal flags.
 */
void btrfs_update_iflags(struct inode *inode)
{
	struct btrfs_inode *ip = BTRFS_I(inode);

	inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);

	if (ip->flags & BTRFS_INODE_SYNC)
		inode->i_flags |= S_SYNC;
	if (ip->flags & BTRFS_INODE_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	if (ip->flags & BTRFS_INODE_APPEND)
		inode->i_flags |= S_APPEND;
	if (ip->flags & BTRFS_INODE_NOATIME)
		inode->i_flags |= S_NOATIME;
	if (ip->flags & BTRFS_INODE_DIRSYNC)
		inode->i_flags |= S_DIRSYNC;
}

/*
 * Inherit flags from the parent inode.
 *
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 * Currently only the compression flags and the cow flags are inherited.
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 */
void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
{
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	unsigned int flags;

	if (!dir)
		return;

	flags = BTRFS_I(dir)->flags;
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	if (flags & BTRFS_INODE_NOCOMPRESS) {
		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
	} else if (flags & BTRFS_INODE_COMPRESS) {
		BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
		BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
	}

	if (flags & BTRFS_INODE_NODATACOW)
		BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
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	btrfs_update_iflags(inode);
}

static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
{
	struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
	unsigned int flags = btrfs_flags_to_ioctl(ip->flags);

	if (copy_to_user(arg, &flags, sizeof(flags)))
		return -EFAULT;
	return 0;
}

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static int check_flags(unsigned int flags)
{
	if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
		      FS_NOATIME_FL | FS_NODUMP_FL | \
		      FS_SYNC_FL | FS_DIRSYNC_FL | \
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		      FS_NOCOMP_FL | FS_COMPR_FL |
		      FS_NOCOW_FL))
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		return -EOPNOTSUPP;

	if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
		return -EINVAL;

	return 0;
}

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static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct btrfs_inode *ip = BTRFS_I(inode);
	struct btrfs_root *root = ip->root;
	struct btrfs_trans_handle *trans;
	unsigned int flags, oldflags;
	int ret;
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	u64 ip_oldflags;
	unsigned int i_oldflags;
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	umode_t mode;
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	if (btrfs_root_readonly(root))
		return -EROFS;

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	if (copy_from_user(&flags, arg, sizeof(flags)))
		return -EFAULT;

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	ret = check_flags(flags);
	if (ret)
		return ret;
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	if (!inode_owner_or_capable(inode))
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		return -EACCES;

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	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

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	mutex_lock(&inode->i_mutex);

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	ip_oldflags = ip->flags;
	i_oldflags = inode->i_flags;
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	mode = inode->i_mode;
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	flags = btrfs_mask_flags(inode->i_mode, flags);
	oldflags = btrfs_flags_to_ioctl(ip->flags);
	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			ret = -EPERM;
			goto out_unlock;
		}
	}

	if (flags & FS_SYNC_FL)
		ip->flags |= BTRFS_INODE_SYNC;
	else
		ip->flags &= ~BTRFS_INODE_SYNC;
	if (flags & FS_IMMUTABLE_FL)
		ip->flags |= BTRFS_INODE_IMMUTABLE;
	else
		ip->flags &= ~BTRFS_INODE_IMMUTABLE;
	if (flags & FS_APPEND_FL)
		ip->flags |= BTRFS_INODE_APPEND;
	else
		ip->flags &= ~BTRFS_INODE_APPEND;
	if (flags & FS_NODUMP_FL)
		ip->flags |= BTRFS_INODE_NODUMP;
	else
		ip->flags &= ~BTRFS_INODE_NODUMP;
	if (flags & FS_NOATIME_FL)
		ip->flags |= BTRFS_INODE_NOATIME;
	else
		ip->flags &= ~BTRFS_INODE_NOATIME;
	if (flags & FS_DIRSYNC_FL)
		ip->flags |= BTRFS_INODE_DIRSYNC;
	else
		ip->flags &= ~BTRFS_INODE_DIRSYNC;
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	if (flags & FS_NOCOW_FL) {
		if (S_ISREG(mode)) {
			/*
			 * It's safe to turn csums off here, no extents exist.
			 * Otherwise we want the flag to reflect the real COW
			 * status of the file and will not set it.
			 */
			if (inode->i_size == 0)
				ip->flags |= BTRFS_INODE_NODATACOW
					   | BTRFS_INODE_NODATASUM;
		} else {
			ip->flags |= BTRFS_INODE_NODATACOW;
		}
	} else {
		/*
		 * Revert back under same assuptions as above
		 */
		if (S_ISREG(mode)) {
			if (inode->i_size == 0)
				ip->flags &= ~(BTRFS_INODE_NODATACOW
				             | BTRFS_INODE_NODATASUM);
		} else {
			ip->flags &= ~BTRFS_INODE_NODATACOW;
		}
	}
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	/*
	 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
	 * flag may be changed automatically if compression code won't make
	 * things smaller.
	 */
	if (flags & FS_NOCOMP_FL) {
		ip->flags &= ~BTRFS_INODE_COMPRESS;
		ip->flags |= BTRFS_INODE_NOCOMPRESS;
	} else if (flags & FS_COMPR_FL) {
		ip->flags |= BTRFS_INODE_COMPRESS;
		ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
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	} else {
		ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
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	}
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	trans = btrfs_start_transaction(root, 1);
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	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out_drop;
	}
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	btrfs_update_iflags(inode);
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	inode_inc_iversion(inode);
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	inode->i_ctime = CURRENT_TIME;
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	ret = btrfs_update_inode(trans, root, inode);

	btrfs_end_transaction(trans, root);
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 out_drop:
	if (ret) {
		ip->flags = ip_oldflags;
		inode->i_flags = i_oldflags;
	}
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 out_unlock:
	mutex_unlock(&inode->i_mutex);
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	mnt_drop_write_file(file);
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	return ret;
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}

static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;

	return put_user(inode->i_generation, arg);
}
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static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
{
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	struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
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	struct btrfs_device *device;
	struct request_queue *q;
	struct fstrim_range range;
	u64 minlen = ULLONG_MAX;
	u64 num_devices = 0;
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	u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
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	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

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	rcu_read_lock();
	list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
				dev_list) {
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		if (!device->bdev)
			continue;
		q = bdev_get_queue(device->bdev);
		if (blk_queue_discard(q)) {
			num_devices++;
			minlen = min((u64)q->limits.discard_granularity,
				     minlen);
		}
	}
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	rcu_read_unlock();
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	if (!num_devices)
		return -EOPNOTSUPP;
	if (copy_from_user(&range, arg, sizeof(range)))
		return -EFAULT;
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	if (range.start > total_bytes ||
	    range.len < fs_info->sb->s_blocksize)
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		return -EINVAL;
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	range.len = min(range.len, total_bytes - range.start);
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	range.minlen = max(range.minlen, minlen);
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	ret = btrfs_trim_fs(fs_info->tree_root, &range);
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	if (ret < 0)
		return ret;

	if (copy_to_user(arg, &range, sizeof(range)))
		return -EFAULT;

	return 0;
}

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static noinline int create_subvol(struct btrfs_root *root,
				  struct dentry *dentry,
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				  char *name, int namelen,
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				  u64 *async_transid,
				  struct btrfs_qgroup_inherit **inherit)
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{
	struct btrfs_trans_handle *trans;
	struct btrfs_key key;
	struct btrfs_root_item root_item;
	struct btrfs_inode_item *inode_item;
	struct extent_buffer *leaf;
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	struct btrfs_root *new_root;
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	struct dentry *parent = dentry->d_parent;
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	struct inode *dir;
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	struct timespec cur_time = CURRENT_TIME;
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	int ret;
	int err;
	u64 objectid;
	u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
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	u64 index = 0;
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	uuid_le new_uuid;
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	ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
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	if (ret)
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		return ret;
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	dir = parent->d_inode;

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	/*
	 * 1 - inode item
	 * 2 - refs
	 * 1 - root item
	 * 2 - dir items
	 */
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	trans = btrfs_start_transaction(root, 6);
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	if (IS_ERR(trans))
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		return PTR_ERR(trans);
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	ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
				   inherit ? *inherit : NULL);
	if (ret)
		goto fail;

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	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
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				      0, objectid, NULL, 0, 0, 0);
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	if (IS_ERR(leaf)) {
		ret = PTR_ERR(leaf);
		goto fail;
	}
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	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
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	btrfs_set_header_bytenr(leaf, leaf->start);
	btrfs_set_header_generation(leaf, trans->transid);
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	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
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	btrfs_set_header_owner(leaf, objectid);

	write_extent_buffer(leaf, root->fs_info->fsid,
			    (unsigned long)btrfs_header_fsid(leaf),
			    BTRFS_FSID_SIZE);
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	write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
			    (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
			    BTRFS_UUID_SIZE);
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	btrfs_mark_buffer_dirty(leaf);

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	memset(&root_item, 0, sizeof(root_item));

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	inode_item = &root_item.inode;
	inode_item->generation = cpu_to_le64(1);
	inode_item->size = cpu_to_le64(3);
	inode_item->nlink = cpu_to_le32(1);
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	inode_item->nbytes = cpu_to_le64(root->leafsize);
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	inode_item->mode = cpu_to_le32(S_IFDIR | 0755);

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	root_item.flags = 0;
	root_item.byte_limit = 0;
	inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);

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	btrfs_set_root_bytenr(&root_item, leaf->start);
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	btrfs_set_root_generation(&root_item, trans->transid);
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	btrfs_set_root_level(&root_item, 0);
	btrfs_set_root_refs(&root_item, 1);
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	btrfs_set_root_used(&root_item, leaf->len);
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	btrfs_set_root_last_snapshot(&root_item, 0);
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	btrfs_set_root_generation_v2(&root_item,
			btrfs_root_generation(&root_item));
	uuid_le_gen(&new_uuid);
	memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
	root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
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	root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
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	root_item.ctime = root_item.otime;
	btrfs_set_root_ctransid(&root_item, trans->transid);
	btrfs_set_root_otransid(&root_item, trans->transid);
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	btrfs_tree_unlock(leaf);
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	free_extent_buffer(leaf);
	leaf = NULL;

	btrfs_set_root_dirid(&root_item, new_dirid);

	key.objectid = objectid;
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	key.offset = 0;
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	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
	ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
				&root_item);
	if (ret)
		goto fail;

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	key.offset = (u64)-1;
	new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
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	if (IS_ERR(new_root)) {
		btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
		ret = PTR_ERR(new_root);
		goto fail;
	}
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	btrfs_record_root_in_trans(trans, new_root);

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	ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
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	if (ret) {
		/* We potentially lose an unused inode item here */
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		btrfs_abort_transaction(trans, root, ret);
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		goto fail;
	}

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	/*
	 * insert the directory item
	 */
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	ret = btrfs_set_inode_index(dir, &index);
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	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
		goto fail;
	}
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	ret = btrfs_insert_dir_item(trans, root,
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				    name, namelen, dir, &key,
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				    BTRFS_FT_DIR, index);
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	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
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		goto fail;
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	}
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	btrfs_i_size_write(dir, dir->i_size + namelen * 2);
	ret = btrfs_update_inode(trans, root, dir);
	BUG_ON(ret);

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	ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
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				 objectid, root->root_key.objectid,
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				 btrfs_ino(dir), index, name, namelen);
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	BUG_ON(ret);
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	d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
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fail:
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	if (async_transid) {
		*async_transid = trans->transid;
		err = btrfs_commit_transaction_async(trans, root, 1);
	} else {
		err = btrfs_commit_transaction(trans, root);
	}
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	if (err && !ret)
		ret = err;
	return ret;
}

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static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
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			   char *name, int namelen, u64 *async_transid,
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			   bool readonly, struct btrfs_qgroup_inherit **inherit)
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{
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	struct inode *inode;
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	struct btrfs_pending_snapshot *pending_snapshot;
	struct btrfs_trans_handle *trans;
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	int ret;
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	if (!root->ref_cows)
		return -EINVAL;

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	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
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	if (!pending_snapshot)
		return -ENOMEM;

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	btrfs_init_block_rsv(&pending_snapshot->block_rsv,
			     BTRFS_BLOCK_RSV_TEMP);
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	pending_snapshot->dentry = dentry;
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	pending_snapshot->root = root;
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	pending_snapshot->readonly = readonly;
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	if (inherit) {
		pending_snapshot->inherit = *inherit;
		*inherit = NULL;	/* take responsibility to free it */
	}
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553
	trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
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	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto fail;
	}

	ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
	BUG_ON(ret);

562
	spin_lock(&root->fs_info->trans_lock);
C
Christoph Hellwig 已提交
563 564
	list_add(&pending_snapshot->list,
		 &trans->transaction->pending_snapshots);
565
	spin_unlock(&root->fs_info->trans_lock);
S
Sage Weil 已提交
566 567 568 569 570 571 572 573
	if (async_transid) {
		*async_transid = trans->transid;
		ret = btrfs_commit_transaction_async(trans,
				     root->fs_info->extent_root, 1);
	} else {
		ret = btrfs_commit_transaction(trans,
					       root->fs_info->extent_root);
	}
574 575
	if (ret)
		goto fail;
576 577 578 579 580

	ret = pending_snapshot->error;
	if (ret)
		goto fail;

581 582 583
	ret = btrfs_orphan_cleanup(pending_snapshot->snap);
	if (ret)
		goto fail;
C
Christoph Hellwig 已提交
584

585
	inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
586 587 588 589 590 591 592 593
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto fail;
	}
	BUG_ON(!inode);
	d_instantiate(dentry, inode);
	ret = 0;
fail:
594
	kfree(pending_snapshot);
C
Christoph Hellwig 已提交
595 596 597
	return ret;
}

598 599 600 601 602 603
/*  copy of check_sticky in fs/namei.c()
* It's inline, so penalty for filesystems that don't use sticky bit is
* minimal.
*/
static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
{
604
	kuid_t fsuid = current_fsuid();
605 606 607

	if (!(dir->i_mode & S_ISVTX))
		return 0;
608
	if (uid_eq(inode->i_uid, fsuid))
609
		return 0;
610
	if (uid_eq(dir->i_uid, fsuid))
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
		return 0;
	return !capable(CAP_FOWNER);
}

/*  copy of may_delete in fs/namei.c()
 *	Check whether we can remove a link victim from directory dir, check
 *  whether the type of victim is right.
 *  1. We can't do it if dir is read-only (done in permission())
 *  2. We should have write and exec permissions on dir
 *  3. We can't remove anything from append-only dir
 *  4. We can't do anything with immutable dir (done in permission())
 *  5. If the sticky bit on dir is set we should either
 *	a. be owner of dir, or
 *	b. be owner of victim, or
 *	c. have CAP_FOWNER capability
 *  6. If the victim is append-only or immutable we can't do antyhing with
 *     links pointing to it.
 *  7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
 *  8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
 *  9. We can't remove a root or mountpoint.
 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
 *     nfs_async_unlink().
 */

static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
{
	int error;

	if (!victim->d_inode)
		return -ENOENT;

	BUG_ON(victim->d_parent->d_inode != dir);
643
	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667

	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
	if (error)
		return error;
	if (IS_APPEND(dir))
		return -EPERM;
	if (btrfs_check_sticky(dir, victim->d_inode)||
		IS_APPEND(victim->d_inode)||
	    IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
		return -EPERM;
	if (isdir) {
		if (!S_ISDIR(victim->d_inode->i_mode))
			return -ENOTDIR;
		if (IS_ROOT(victim))
			return -EBUSY;
	} else if (S_ISDIR(victim->d_inode->i_mode))
		return -EISDIR;
	if (IS_DEADDIR(dir))
		return -ENOENT;
	if (victim->d_flags & DCACHE_NFSFS_RENAMED)
		return -EBUSY;
	return 0;
}

668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
/* copy of may_create in fs/namei.c() */
static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
{
	if (child->d_inode)
		return -EEXIST;
	if (IS_DEADDIR(dir))
		return -ENOENT;
	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
}

/*
 * Create a new subvolume below @parent.  This is largely modeled after
 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
 * inside this filesystem so it's quite a bit simpler.
 */
683 684
static noinline int btrfs_mksubvol(struct path *parent,
				   char *name, int namelen,
S
Sage Weil 已提交
685
				   struct btrfs_root *snap_src,
A
Arne Jansen 已提交
686 687
				   u64 *async_transid, bool readonly,
				   struct btrfs_qgroup_inherit **inherit)
688
{
689
	struct inode *dir  = parent->dentry->d_inode;
690 691 692
	struct dentry *dentry;
	int error;

693
	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
694 695 696 697 698 699 700 701 702 703

	dentry = lookup_one_len(name, parent->dentry, namelen);
	error = PTR_ERR(dentry);
	if (IS_ERR(dentry))
		goto out_unlock;

	error = -EEXIST;
	if (dentry->d_inode)
		goto out_dput;

704
	error = btrfs_may_create(dir, dentry);
705
	if (error)
706
		goto out_dput;
707

708 709 710 711 712
	down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);

	if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
		goto out_up_read;

713
	if (snap_src) {
A
Arne Jansen 已提交
714 715
		error = create_snapshot(snap_src, dentry, name, namelen,
					async_transid, readonly, inherit);
716
	} else {
717
		error = create_subvol(BTRFS_I(dir)->root, dentry,
A
Arne Jansen 已提交
718
				      name, namelen, async_transid, inherit);
719
	}
720 721 722 723
	if (!error)
		fsnotify_mkdir(dir, dentry);
out_up_read:
	up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
724 725 726
out_dput:
	dput(dentry);
out_unlock:
727
	mutex_unlock(&dir->i_mutex);
728 729 730
	return error;
}

C
Chris Mason 已提交
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
/*
 * When we're defragging a range, we don't want to kick it off again
 * if it is really just waiting for delalloc to send it down.
 * If we find a nice big extent or delalloc range for the bytes in the
 * file you want to defrag, we return 0 to let you know to skip this
 * part of the file
 */
static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
{
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
	struct extent_map *em = NULL;
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
	u64 end;

	read_lock(&em_tree->lock);
	em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
	read_unlock(&em_tree->lock);

	if (em) {
		end = extent_map_end(em);
		free_extent_map(em);
		if (end - offset > thresh)
			return 0;
	}
	/* if we already have a nice delalloc here, just stop */
	thresh /= 2;
	end = count_range_bits(io_tree, &offset, offset + thresh,
			       thresh, EXTENT_DELALLOC, 1);
	if (end >= thresh)
		return 0;
	return 1;
}

/*
 * helper function to walk through a file and find extents
 * newer than a specific transid, and smaller than thresh.
 *
 * This is used by the defragging code to find new and small
 * extents
 */
static int find_new_extents(struct btrfs_root *root,
			    struct inode *inode, u64 newer_than,
			    u64 *off, int thresh)
{
	struct btrfs_path *path;
	struct btrfs_key min_key;
	struct btrfs_key max_key;
	struct extent_buffer *leaf;
	struct btrfs_file_extent_item *extent;
	int type;
	int ret;
782
	u64 ino = btrfs_ino(inode);
C
Chris Mason 已提交
783 784 785 786 787

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

788
	min_key.objectid = ino;
C
Chris Mason 已提交
789 790 791
	min_key.type = BTRFS_EXTENT_DATA_KEY;
	min_key.offset = *off;

792
	max_key.objectid = ino;
C
Chris Mason 已提交
793 794 795 796 797 798 799 800 801 802
	max_key.type = (u8)-1;
	max_key.offset = (u64)-1;

	path->keep_locks = 1;

	while(1) {
		ret = btrfs_search_forward(root, &min_key, &max_key,
					   path, 0, newer_than);
		if (ret != 0)
			goto none;
803
		if (min_key.objectid != ino)
C
Chris Mason 已提交
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
			goto none;
		if (min_key.type != BTRFS_EXTENT_DATA_KEY)
			goto none;

		leaf = path->nodes[0];
		extent = btrfs_item_ptr(leaf, path->slots[0],
					struct btrfs_file_extent_item);

		type = btrfs_file_extent_type(leaf, extent);
		if (type == BTRFS_FILE_EXTENT_REG &&
		    btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
		    check_defrag_in_cache(inode, min_key.offset, thresh)) {
			*off = min_key.offset;
			btrfs_free_path(path);
			return 0;
		}

		if (min_key.offset == (u64)-1)
			goto none;

		min_key.offset++;
		btrfs_release_path(path);
	}
none:
	btrfs_free_path(path);
	return -ENOENT;
}

L
Li Zefan 已提交
832
static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
833 834
{
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
L
Li Zefan 已提交
835 836 837
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
	struct extent_map *em;
	u64 len = PAGE_CACHE_SIZE;
838

L
Li Zefan 已提交
839 840 841 842
	/*
	 * hopefully we have this extent in the tree already, try without
	 * the full extent lock
	 */
843
	read_lock(&em_tree->lock);
L
Li Zefan 已提交
844
	em = lookup_extent_mapping(em_tree, start, len);
845 846
	read_unlock(&em_tree->lock);

L
Li Zefan 已提交
847 848 849 850 851 852 853 854 855 856 857 858
	if (!em) {
		/* get the big lock and read metadata off disk */
		lock_extent(io_tree, start, start + len - 1);
		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
		unlock_extent(io_tree, start, start + len - 1);

		if (IS_ERR(em))
			return NULL;
	}

	return em;
}
859

L
Li Zefan 已提交
860 861 862 863 864 865 866 867 868 869 870 871 872 873
static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
{
	struct extent_map *next;
	bool ret = true;

	/* this is the last extent */
	if (em->start + em->len >= i_size_read(inode))
		return false;

	next = defrag_lookup_extent(inode, em->start + em->len);
	if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
		ret = false;

	free_extent_map(next);
874 875 876
	return ret;
}

L
Li Zefan 已提交
877
static int should_defrag_range(struct inode *inode, u64 start, int thresh,
878 879
			       u64 *last_len, u64 *skip, u64 *defrag_end,
			       int compress)
880
{
L
Li Zefan 已提交
881
	struct extent_map *em;
882
	int ret = 1;
L
Li Zefan 已提交
883
	bool next_mergeable = true;
884 885

	/*
886
	 * make sure that once we start defragging an extent, we keep on
887 888 889 890 891 892 893
	 * defragging it
	 */
	if (start < *defrag_end)
		return 1;

	*skip = 0;

L
Li Zefan 已提交
894 895 896
	em = defrag_lookup_extent(inode, start);
	if (!em)
		return 0;
897 898

	/* this will cover holes, and inline extents */
899
	if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
900
		ret = 0;
901 902 903
		goto out;
	}

L
Li Zefan 已提交
904
	next_mergeable = defrag_check_next_extent(inode, em);
905 906

	/*
L
Li Zefan 已提交
907 908
	 * we hit a real extent, if it is big or the next extent is not a
	 * real extent, don't bother defragging it
909
	 */
910
	if (!compress && (*last_len == 0 || *last_len >= thresh) &&
L
Li Zefan 已提交
911
	    (em->len >= thresh || !next_mergeable))
912
		ret = 0;
913
out:
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
	/*
	 * last_len ends up being a counter of how many bytes we've defragged.
	 * every time we choose not to defrag an extent, we reset *last_len
	 * so that the next tiny extent will force a defrag.
	 *
	 * The end result of this is that tiny extents before a single big
	 * extent will force at least part of that big extent to be defragged.
	 */
	if (ret) {
		*defrag_end = extent_map_end(em);
	} else {
		*last_len = 0;
		*skip = extent_map_end(em);
		*defrag_end = 0;
	}

	free_extent_map(em);
	return ret;
}

C
Chris Mason 已提交
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
/*
 * it doesn't do much good to defrag one or two pages
 * at a time.  This pulls in a nice chunk of pages
 * to COW and defrag.
 *
 * It also makes sure the delalloc code has enough
 * dirty data to avoid making new small extents as part
 * of the defrag
 *
 * It's a good idea to start RA on this range
 * before calling this.
 */
static int cluster_pages_for_defrag(struct inode *inode,
				    struct page **pages,
				    unsigned long start_index,
				    int num_pages)
C
Christoph Hellwig 已提交
950
{
C
Chris Mason 已提交
951 952 953 954
	unsigned long file_end;
	u64 isize = i_size_read(inode);
	u64 page_start;
	u64 page_end;
955
	u64 page_cnt;
C
Chris Mason 已提交
956 957 958
	int ret;
	int i;
	int i_done;
959
	struct btrfs_ordered_extent *ordered;
C
Chris Mason 已提交
960
	struct extent_state *cached_state = NULL;
961
	struct extent_io_tree *tree;
962
	gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
C
Chris Mason 已提交
963 964

	file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
965 966 967 968
	if (!isize || start_index > file_end)
		return 0;

	page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
C
Chris Mason 已提交
969 970

	ret = btrfs_delalloc_reserve_space(inode,
971
					   page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
972 973 974
	if (ret)
		return ret;
	i_done = 0;
975
	tree = &BTRFS_I(inode)->io_tree;
C
Chris Mason 已提交
976 977

	/* step one, lock all the pages */
978
	for (i = 0; i < page_cnt; i++) {
C
Chris Mason 已提交
979
		struct page *page;
980
again:
981
		page = find_or_create_page(inode->i_mapping,
982
					   start_index + i, mask);
C
Chris Mason 已提交
983 984 985
		if (!page)
			break;

986 987 988
		page_start = page_offset(page);
		page_end = page_start + PAGE_CACHE_SIZE - 1;
		while (1) {
989
			lock_extent(tree, page_start, page_end);
990 991
			ordered = btrfs_lookup_ordered_extent(inode,
							      page_start);
992
			unlock_extent(tree, page_start, page_end);
993 994 995 996 997 998 999
			if (!ordered)
				break;

			unlock_page(page);
			btrfs_start_ordered_extent(inode, ordered, 1);
			btrfs_put_ordered_extent(ordered);
			lock_page(page);
1000 1001 1002 1003 1004 1005 1006 1007 1008
			/*
			 * we unlocked the page above, so we need check if
			 * it was released or not.
			 */
			if (page->mapping != inode->i_mapping) {
				unlock_page(page);
				page_cache_release(page);
				goto again;
			}
1009 1010
		}

C
Chris Mason 已提交
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
		if (!PageUptodate(page)) {
			btrfs_readpage(NULL, page);
			lock_page(page);
			if (!PageUptodate(page)) {
				unlock_page(page);
				page_cache_release(page);
				ret = -EIO;
				break;
			}
		}
1021 1022 1023 1024 1025 1026 1027

		if (page->mapping != inode->i_mapping) {
			unlock_page(page);
			page_cache_release(page);
			goto again;
		}

C
Chris Mason 已提交
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
		pages[i] = page;
		i_done++;
	}
	if (!i_done || ret)
		goto out;

	if (!(inode->i_sb->s_flags & MS_ACTIVE))
		goto out;

	/*
	 * so now we have a nice long stream of locked
	 * and up to date pages, lets wait on them
	 */
	for (i = 0; i < i_done; i++)
		wait_on_page_writeback(pages[i]);

	page_start = page_offset(pages[0]);
	page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;

	lock_extent_bits(&BTRFS_I(inode)->io_tree,
1048
			 page_start, page_end - 1, 0, &cached_state);
C
Chris Mason 已提交
1049 1050
	clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
			  page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1051 1052
			  EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1053

1054
	if (i_done != page_cnt) {
1055 1056 1057
		spin_lock(&BTRFS_I(inode)->lock);
		BTRFS_I(inode)->outstanding_extents++;
		spin_unlock(&BTRFS_I(inode)->lock);
C
Chris Mason 已提交
1058
		btrfs_delalloc_release_space(inode,
1059
				     (page_cnt - i_done) << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1060 1061 1062
	}


1063 1064
	set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083

	unlock_extent_cached(&BTRFS_I(inode)->io_tree,
			     page_start, page_end - 1, &cached_state,
			     GFP_NOFS);

	for (i = 0; i < i_done; i++) {
		clear_page_dirty_for_io(pages[i]);
		ClearPageChecked(pages[i]);
		set_page_extent_mapped(pages[i]);
		set_page_dirty(pages[i]);
		unlock_page(pages[i]);
		page_cache_release(pages[i]);
	}
	return i_done;
out:
	for (i = 0; i < i_done; i++) {
		unlock_page(pages[i]);
		page_cache_release(pages[i]);
	}
1084
	btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
	return ret;

}

int btrfs_defrag_file(struct inode *inode, struct file *file,
		      struct btrfs_ioctl_defrag_range_args *range,
		      u64 newer_than, unsigned long max_to_defrag)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct file_ra_state *ra = NULL;
C
Christoph Hellwig 已提交
1095
	unsigned long last_index;
1096
	u64 isize = i_size_read(inode);
1097 1098 1099
	u64 last_len = 0;
	u64 skip = 0;
	u64 defrag_end = 0;
C
Chris Mason 已提交
1100
	u64 newer_off = range->start;
C
Christoph Hellwig 已提交
1101
	unsigned long i;
1102
	unsigned long ra_index = 0;
C
Christoph Hellwig 已提交
1103
	int ret;
C
Chris Mason 已提交
1104
	int defrag_count = 0;
1105
	int compress_type = BTRFS_COMPRESS_ZLIB;
C
Chris Mason 已提交
1106
	int extent_thresh = range->extent_thresh;
1107 1108
	int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
	int cluster = max_cluster;
C
Chris Mason 已提交
1109 1110 1111 1112 1113
	u64 new_align = ~((u64)128 * 1024 - 1);
	struct page **pages = NULL;

	if (extent_thresh == 0)
		extent_thresh = 256 * 1024;
1114 1115 1116 1117 1118 1119 1120

	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
		if (range->compress_type > BTRFS_COMPRESS_TYPES)
			return -EINVAL;
		if (range->compress_type)
			compress_type = range->compress_type;
	}
C
Christoph Hellwig 已提交
1121

1122
	if (isize == 0)
1123 1124
		return 0;

C
Chris Mason 已提交
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	/*
	 * if we were not given a file, allocate a readahead
	 * context
	 */
	if (!file) {
		ra = kzalloc(sizeof(*ra), GFP_NOFS);
		if (!ra)
			return -ENOMEM;
		file_ra_state_init(ra, inode->i_mapping);
	} else {
		ra = &file->f_ra;
	}

1138
	pages = kmalloc(sizeof(struct page *) * max_cluster,
C
Chris Mason 已提交
1139 1140 1141 1142 1143 1144 1145
			GFP_NOFS);
	if (!pages) {
		ret = -ENOMEM;
		goto out_ra;
	}

	/* find the last page to defrag */
C
Chris Mason 已提交
1146
	if (range->start + range->len > range->start) {
1147
		last_index = min_t(u64, isize - 1,
C
Chris Mason 已提交
1148 1149
			 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
	} else {
1150
		last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
C
Chris Mason 已提交
1151 1152
	}

C
Chris Mason 已提交
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	if (newer_than) {
		ret = find_new_extents(root, inode, newer_than,
				       &newer_off, 64 * 1024);
		if (!ret) {
			range->start = newer_off;
			/*
			 * we always align our defrag to help keep
			 * the extents in the file evenly spaced
			 */
			i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
		} else
			goto out_ra;
	} else {
		i = range->start >> PAGE_CACHE_SHIFT;
	}
	if (!max_to_defrag)
L
Liu Bo 已提交
1169
		max_to_defrag = last_index + 1;
C
Chris Mason 已提交
1170

L
Li Zefan 已提交
1171 1172 1173 1174 1175 1176 1177
	/*
	 * make writeback starts from i, so the defrag range can be
	 * written sequentially.
	 */
	if (i < inode->i_mapping->writeback_index)
		inode->i_mapping->writeback_index = i;

1178 1179 1180
	while (i <= last_index && defrag_count < max_to_defrag &&
	       (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
		PAGE_CACHE_SHIFT)) {
C
Chris Mason 已提交
1181 1182 1183 1184 1185 1186 1187
		/*
		 * make sure we stop running if someone unmounts
		 * the FS
		 */
		if (!(inode->i_sb->s_flags & MS_ACTIVE))
			break;

1188
		if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
L
Li Zefan 已提交
1189
					 extent_thresh, &last_len, &skip,
1190 1191
					 &defrag_end, range->flags &
					 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1192 1193 1194 1195 1196 1197 1198 1199 1200
			unsigned long next;
			/*
			 * the should_defrag function tells us how much to skip
			 * bump our counter by the suggested amount
			 */
			next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
			i = max(i + 1, next);
			continue;
		}
1201 1202 1203 1204 1205 1206 1207 1208 1209

		if (!newer_than) {
			cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
				   PAGE_CACHE_SHIFT) - i;
			cluster = min(cluster, max_cluster);
		} else {
			cluster = max_cluster;
		}

C
Chris Mason 已提交
1210
		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1211
			BTRFS_I(inode)->force_compress = compress_type;
1212

1213 1214 1215 1216 1217 1218
		if (i + cluster > ra_index) {
			ra_index = max(i, ra_index);
			btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
				       cluster);
			ra_index += max_cluster;
		}
1219

1220
		mutex_lock(&inode->i_mutex);
1221
		ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1222 1223
		if (ret < 0) {
			mutex_unlock(&inode->i_mutex);
C
Chris Mason 已提交
1224
			goto out_ra;
1225
		}
C
Chris Mason 已提交
1226 1227 1228

		defrag_count += ret;
		balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
1229
		mutex_unlock(&inode->i_mutex);
C
Chris Mason 已提交
1230 1231 1232 1233 1234

		if (newer_than) {
			if (newer_off == (u64)-1)
				break;

1235 1236 1237
			if (ret > 0)
				i += ret;

C
Chris Mason 已提交
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
			newer_off = max(newer_off + 1,
					(u64)i << PAGE_CACHE_SHIFT);

			ret = find_new_extents(root, inode,
					       newer_than, &newer_off,
					       64 * 1024);
			if (!ret) {
				range->start = newer_off;
				i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
			} else {
				break;
C
Christoph Hellwig 已提交
1249
			}
C
Chris Mason 已提交
1250
		} else {
1251
			if (ret > 0) {
L
Li Zefan 已提交
1252
				i += ret;
1253 1254
				last_len += ret << PAGE_CACHE_SHIFT;
			} else {
L
Li Zefan 已提交
1255
				i++;
1256 1257
				last_len = 0;
			}
C
Christoph Hellwig 已提交
1258 1259 1260
		}
	}

C
Chris Mason 已提交
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
	if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
		filemap_flush(inode->i_mapping);

	if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
		/* the filemap_flush will queue IO into the worker threads, but
		 * we have to make sure the IO is actually started and that
		 * ordered extents get created before we return
		 */
		atomic_inc(&root->fs_info->async_submit_draining);
		while (atomic_read(&root->fs_info->nr_async_submits) ||
		      atomic_read(&root->fs_info->async_delalloc_pages)) {
			wait_event(root->fs_info->async_submit_wait,
			   (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
			    atomic_read(&root->fs_info->async_delalloc_pages) == 0));
		}
		atomic_dec(&root->fs_info->async_submit_draining);

		mutex_lock(&inode->i_mutex);
1279
		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
C
Chris Mason 已提交
1280 1281 1282
		mutex_unlock(&inode->i_mutex);
	}

1283
	if (range->compress_type == BTRFS_COMPRESS_LZO) {
1284
		btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1285 1286
	}

1287
	ret = defrag_count;
1288

C
Chris Mason 已提交
1289 1290 1291 1292
out_ra:
	if (!file)
		kfree(ra);
	kfree(pages);
1293
	return ret;
C
Christoph Hellwig 已提交
1294 1295
}

1296 1297
static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
					void __user *arg)
C
Christoph Hellwig 已提交
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
{
	u64 new_size;
	u64 old_size;
	u64 devid = 1;
	struct btrfs_ioctl_vol_args *vol_args;
	struct btrfs_trans_handle *trans;
	struct btrfs_device *device = NULL;
	char *sizestr;
	char *devstr = NULL;
	int ret = 0;
	int mod = 0;

Y
Yan Zheng 已提交
1310 1311 1312
	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

1313 1314 1315
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

1316 1317 1318 1319 1320 1321 1322
	mutex_lock(&root->fs_info->volume_mutex);
	if (root->fs_info->balance_ctl) {
		printk(KERN_INFO "btrfs: balance in progress\n");
		ret = -EINVAL;
		goto out;
	}

L
Li Zefan 已提交
1323
	vol_args = memdup_user(arg, sizeof(*vol_args));
1324 1325 1326 1327
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
1328 1329

	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
1330 1331 1332 1333 1334 1335 1336 1337 1338

	sizestr = vol_args->name;
	devstr = strchr(sizestr, ':');
	if (devstr) {
		char *end;
		sizestr = devstr + 1;
		*devstr = '\0';
		devstr = vol_args->name;
		devid = simple_strtoull(devstr, &end, 10);
1339
		printk(KERN_INFO "btrfs: resizing devid %llu\n",
1340
		       (unsigned long long)devid);
C
Christoph Hellwig 已提交
1341
	}
Y
Yan Zheng 已提交
1342
	device = btrfs_find_device(root, devid, NULL, NULL);
C
Christoph Hellwig 已提交
1343
	if (!device) {
1344
		printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
1345
		       (unsigned long long)devid);
C
Christoph Hellwig 已提交
1346
		ret = -EINVAL;
1347
		goto out_free;
C
Christoph Hellwig 已提交
1348
	}
L
Liu Bo 已提交
1349 1350
	if (device->fs_devices && device->fs_devices->seeding) {
		printk(KERN_INFO "btrfs: resizer unable to apply on "
1351 1352
		       "seeding device %llu\n",
		       (unsigned long long)devid);
L
Liu Bo 已提交
1353 1354 1355 1356
		ret = -EINVAL;
		goto out_free;
	}

C
Christoph Hellwig 已提交
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
	if (!strcmp(sizestr, "max"))
		new_size = device->bdev->bd_inode->i_size;
	else {
		if (sizestr[0] == '-') {
			mod = -1;
			sizestr++;
		} else if (sizestr[0] == '+') {
			mod = 1;
			sizestr++;
		}
A
Akinobu Mita 已提交
1367
		new_size = memparse(sizestr, NULL);
C
Christoph Hellwig 已提交
1368 1369
		if (new_size == 0) {
			ret = -EINVAL;
1370
			goto out_free;
C
Christoph Hellwig 已提交
1371 1372 1373 1374 1375 1376 1377 1378
		}
	}

	old_size = device->total_bytes;

	if (mod < 0) {
		if (new_size > old_size) {
			ret = -EINVAL;
1379
			goto out_free;
C
Christoph Hellwig 已提交
1380 1381 1382 1383 1384 1385 1386 1387
		}
		new_size = old_size - new_size;
	} else if (mod > 0) {
		new_size = old_size + new_size;
	}

	if (new_size < 256 * 1024 * 1024) {
		ret = -EINVAL;
1388
		goto out_free;
C
Christoph Hellwig 已提交
1389 1390 1391
	}
	if (new_size > device->bdev->bd_inode->i_size) {
		ret = -EFBIG;
1392
		goto out_free;
C
Christoph Hellwig 已提交
1393 1394 1395 1396 1397
	}

	do_div(new_size, root->sectorsize);
	new_size *= root->sectorsize;

1398 1399 1400
	printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
		      rcu_str_deref(device->name),
		      (unsigned long long)new_size);
C
Christoph Hellwig 已提交
1401 1402

	if (new_size > old_size) {
1403
		trans = btrfs_start_transaction(root, 0);
1404 1405
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
1406
			goto out_free;
1407
		}
C
Christoph Hellwig 已提交
1408 1409
		ret = btrfs_grow_device(trans, device, new_size);
		btrfs_commit_transaction(trans, root);
1410
	} else if (new_size < old_size) {
C
Christoph Hellwig 已提交
1411 1412 1413
		ret = btrfs_shrink_device(device, new_size);
	}

1414
out_free:
C
Christoph Hellwig 已提交
1415
	kfree(vol_args);
1416 1417
out:
	mutex_unlock(&root->fs_info->volume_mutex);
C
Christoph Hellwig 已提交
1418 1419 1420
	return ret;
}

S
Sage Weil 已提交
1421
static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
A
Arne Jansen 已提交
1422 1423 1424
				char *name, unsigned long fd, int subvol,
				u64 *transid, bool readonly,
				struct btrfs_qgroup_inherit **inherit)
C
Christoph Hellwig 已提交
1425 1426
{
	int namelen;
1427
	int ret = 0;
C
Christoph Hellwig 已提交
1428

1429 1430 1431 1432
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;

S
Sage Weil 已提交
1433 1434
	namelen = strlen(name);
	if (strchr(name, '/')) {
C
Christoph Hellwig 已提交
1435
		ret = -EINVAL;
1436
		goto out_drop_write;
C
Christoph Hellwig 已提交
1437 1438
	}

1439 1440 1441
	if (name[0] == '.' &&
	   (namelen == 1 || (name[1] == '.' && namelen == 2))) {
		ret = -EEXIST;
1442
		goto out_drop_write;
1443 1444
	}

1445
	if (subvol) {
S
Sage Weil 已提交
1446
		ret = btrfs_mksubvol(&file->f_path, name, namelen,
A
Arne Jansen 已提交
1447
				     NULL, transid, readonly, inherit);
1448
	} else {
1449
		struct fd src = fdget(fd);
1450
		struct inode *src_inode;
1451
		if (!src.file) {
1452
			ret = -EINVAL;
1453
			goto out_drop_write;
1454 1455
		}

1456
		src_inode = src.file->f_path.dentry->d_inode;
1457
		if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
C
Chris Mason 已提交
1458 1459
			printk(KERN_INFO "btrfs: Snapshot src from "
			       "another FS\n");
1460
			ret = -EINVAL;
1461 1462 1463 1464
		} else {
			ret = btrfs_mksubvol(&file->f_path, name, namelen,
					     BTRFS_I(src_inode)->root,
					     transid, readonly, inherit);
1465
		}
1466
		fdput(src);
1467
	}
1468 1469
out_drop_write:
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1470
out:
S
Sage Weil 已提交
1471 1472 1473 1474
	return ret;
}

static noinline int btrfs_ioctl_snap_create(struct file *file,
1475
					    void __user *arg, int subvol)
S
Sage Weil 已提交
1476
{
1477
	struct btrfs_ioctl_vol_args *vol_args;
S
Sage Weil 已提交
1478 1479
	int ret;

1480 1481 1482 1483
	vol_args = memdup_user(arg, sizeof(*vol_args));
	if (IS_ERR(vol_args))
		return PTR_ERR(vol_args);
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
S
Sage Weil 已提交
1484

1485
	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
L
Li Zefan 已提交
1486
					      vol_args->fd, subvol,
A
Arne Jansen 已提交
1487
					      NULL, false, NULL);
1488

1489 1490 1491
	kfree(vol_args);
	return ret;
}
1492

1493 1494 1495 1496 1497 1498 1499
static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
					       void __user *arg, int subvol)
{
	struct btrfs_ioctl_vol_args_v2 *vol_args;
	int ret;
	u64 transid = 0;
	u64 *ptr = NULL;
L
Li Zefan 已提交
1500
	bool readonly = false;
A
Arne Jansen 已提交
1501
	struct btrfs_qgroup_inherit *inherit = NULL;
1502

1503 1504 1505 1506
	vol_args = memdup_user(arg, sizeof(*vol_args));
	if (IS_ERR(vol_args))
		return PTR_ERR(vol_args);
	vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1507

L
Li Zefan 已提交
1508
	if (vol_args->flags &
A
Arne Jansen 已提交
1509 1510
	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
	      BTRFS_SUBVOL_QGROUP_INHERIT)) {
L
Li Zefan 已提交
1511
		ret = -EOPNOTSUPP;
1512
		goto out;
S
Sage Weil 已提交
1513
	}
1514 1515 1516

	if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
		ptr = &transid;
L
Li Zefan 已提交
1517 1518
	if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
		readonly = true;
A
Arne Jansen 已提交
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
	if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
		if (vol_args->size > PAGE_CACHE_SIZE) {
			ret = -EINVAL;
			goto out;
		}
		inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
		if (IS_ERR(inherit)) {
			ret = PTR_ERR(inherit);
			goto out;
		}
	}
1530 1531

	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
A
Arne Jansen 已提交
1532 1533
					      vol_args->fd, subvol, ptr,
					      readonly, &inherit);
1534 1535 1536 1537 1538 1539

	if (ret == 0 && ptr &&
	    copy_to_user(arg +
			 offsetof(struct btrfs_ioctl_vol_args_v2,
				  transid), ptr, sizeof(*ptr)))
		ret = -EFAULT;
1540
out:
C
Christoph Hellwig 已提交
1541
	kfree(vol_args);
A
Arne Jansen 已提交
1542
	kfree(inherit);
C
Christoph Hellwig 已提交
1543 1544 1545
	return ret;
}

1546 1547 1548 1549 1550 1551 1552 1553
static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
						void __user *arg)
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret = 0;
	u64 flags = 0;

L
Li Zefan 已提交
1554
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
		return -EINVAL;

	down_read(&root->fs_info->subvol_sem);
	if (btrfs_root_readonly(root))
		flags |= BTRFS_SUBVOL_RDONLY;
	up_read(&root->fs_info->subvol_sem);

	if (copy_to_user(arg, &flags, sizeof(flags)))
		ret = -EFAULT;

	return ret;
}

static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
					      void __user *arg)
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	u64 root_flags;
	u64 flags;
	int ret = 0;

1578 1579 1580
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;
1581

1582 1583 1584 1585
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1586

1587 1588 1589 1590
	if (copy_from_user(&flags, arg, sizeof(flags))) {
		ret = -EFAULT;
		goto out_drop_write;
	}
1591

1592 1593 1594 1595
	if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1596

1597 1598 1599 1600
	if (flags & ~BTRFS_SUBVOL_RDONLY) {
		ret = -EOPNOTSUPP;
		goto out_drop_write;
	}
1601

1602 1603 1604 1605
	if (!inode_owner_or_capable(inode)) {
		ret = -EACCES;
		goto out_drop_write;
	}
1606

1607 1608 1609 1610
	down_write(&root->fs_info->subvol_sem);

	/* nothing to do */
	if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1611
		goto out_drop_sem;
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626

	root_flags = btrfs_root_flags(&root->root_item);
	if (flags & BTRFS_SUBVOL_RDONLY)
		btrfs_set_root_flags(&root->root_item,
				     root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
	else
		btrfs_set_root_flags(&root->root_item,
				     root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);

	trans = btrfs_start_transaction(root, 1);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out_reset;
	}

1627
	ret = btrfs_update_root(trans, root->fs_info->tree_root,
1628 1629 1630 1631 1632 1633
				&root->root_key, &root->root_item);

	btrfs_commit_transaction(trans, root);
out_reset:
	if (ret)
		btrfs_set_root_flags(&root->root_item, root_flags);
1634
out_drop_sem:
1635
	up_write(&root->fs_info->subvol_sem);
1636 1637 1638
out_drop_write:
	mnt_drop_write_file(file);
out:
1639 1640 1641
	return ret;
}

1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
/*
 * helper to check if the subvolume references other subvolumes
 */
static noinline int may_destroy_subvol(struct btrfs_root *root)
{
	struct btrfs_path *path;
	struct btrfs_key key;
	int ret;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = root->root_key.objectid;
	key.type = BTRFS_ROOT_REF_KEY;
	key.offset = (u64)-1;

	ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
				&key, path, 0, 0);
	if (ret < 0)
		goto out;
	BUG_ON(ret == 0);

	ret = 0;
	if (path->slots[0] > 0) {
		path->slots[0]--;
		btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
		if (key.objectid == root->root_key.objectid &&
		    key.type == BTRFS_ROOT_REF_KEY)
			ret = -ENOTEMPTY;
	}
out:
	btrfs_free_path(path);
	return ret;
}

1678 1679 1680
static noinline int key_in_sk(struct btrfs_key *key,
			      struct btrfs_ioctl_search_key *sk)
{
1681 1682 1683 1684 1685 1686 1687 1688 1689
	struct btrfs_key test;
	int ret;

	test.objectid = sk->min_objectid;
	test.type = sk->min_type;
	test.offset = sk->min_offset;

	ret = btrfs_comp_cpu_keys(key, &test);
	if (ret < 0)
1690
		return 0;
1691 1692 1693 1694 1695 1696 1697

	test.objectid = sk->max_objectid;
	test.type = sk->max_type;
	test.offset = sk->max_offset;

	ret = btrfs_comp_cpu_keys(key, &test);
	if (ret > 0)
1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
		return 0;
	return 1;
}

static noinline int copy_to_sk(struct btrfs_root *root,
			       struct btrfs_path *path,
			       struct btrfs_key *key,
			       struct btrfs_ioctl_search_key *sk,
			       char *buf,
			       unsigned long *sk_offset,
			       int *num_found)
{
	u64 found_transid;
	struct extent_buffer *leaf;
	struct btrfs_ioctl_search_header sh;
	unsigned long item_off;
	unsigned long item_len;
	int nritems;
	int i;
	int slot;
	int ret = 0;

	leaf = path->nodes[0];
	slot = path->slots[0];
	nritems = btrfs_header_nritems(leaf);

	if (btrfs_header_generation(leaf) > sk->max_transid) {
		i = nritems;
		goto advance_key;
	}
	found_transid = btrfs_header_generation(leaf);

	for (i = slot; i < nritems; i++) {
		item_off = btrfs_item_ptr_offset(leaf, i);
		item_len = btrfs_item_size_nr(leaf, i);

		if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
			item_len = 0;

		if (sizeof(sh) + item_len + *sk_offset >
		    BTRFS_SEARCH_ARGS_BUFSIZE) {
			ret = 1;
			goto overflow;
		}

		btrfs_item_key_to_cpu(leaf, key, i);
		if (!key_in_sk(key, sk))
			continue;

		sh.objectid = key->objectid;
		sh.offset = key->offset;
		sh.type = key->type;
		sh.len = item_len;
		sh.transid = found_transid;

		/* copy search result header */
		memcpy(buf + *sk_offset, &sh, sizeof(sh));
		*sk_offset += sizeof(sh);

		if (item_len) {
			char *p = buf + *sk_offset;
			/* copy the item */
			read_extent_buffer(leaf, p,
					   item_off, item_len);
			*sk_offset += item_len;
		}
1764
		(*num_found)++;
1765 1766 1767 1768 1769

		if (*num_found >= sk->nr_items)
			break;
	}
advance_key:
1770 1771
	ret = 0;
	if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1772
		key->offset++;
1773 1774
	else if (key->type < (u8)-1 && key->type < sk->max_type) {
		key->offset = 0;
1775
		key->type++;
1776 1777 1778
	} else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
		key->offset = 0;
		key->type = 0;
1779
		key->objectid++;
1780 1781
	} else
		ret = 1;
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
overflow:
	return ret;
}

static noinline int search_ioctl(struct inode *inode,
				 struct btrfs_ioctl_search_args *args)
{
	struct btrfs_root *root;
	struct btrfs_key key;
	struct btrfs_key max_key;
	struct btrfs_path *path;
	struct btrfs_ioctl_search_key *sk = &args->key;
	struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
	int ret;
	int num_found = 0;
	unsigned long sk_offset = 0;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	if (sk->tree_id == 0) {
		/* search the root of the inode that was passed */
		root = BTRFS_I(inode)->root;
	} else {
		key.objectid = sk->tree_id;
		key.type = BTRFS_ROOT_ITEM_KEY;
		key.offset = (u64)-1;
		root = btrfs_read_fs_root_no_name(info, &key);
		if (IS_ERR(root)) {
			printk(KERN_ERR "could not find root %llu\n",
			       sk->tree_id);
			btrfs_free_path(path);
			return -ENOENT;
		}
	}

	key.objectid = sk->min_objectid;
	key.type = sk->min_type;
	key.offset = sk->min_offset;

	max_key.objectid = sk->max_objectid;
	max_key.type = sk->max_type;
	max_key.offset = sk->max_offset;

	path->keep_locks = 1;

	while(1) {
		ret = btrfs_search_forward(root, &key, &max_key, path, 0,
					   sk->min_transid);
		if (ret != 0) {
			if (ret > 0)
				ret = 0;
			goto err;
		}
		ret = copy_to_sk(root, path, &key, sk, args->buf,
				 &sk_offset, &num_found);
1839
		btrfs_release_path(path);
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
		if (ret || num_found >= sk->nr_items)
			break;

	}
	ret = 0;
err:
	sk->nr_items = num_found;
	btrfs_free_path(path);
	return ret;
}

static noinline int btrfs_ioctl_tree_search(struct file *file,
					   void __user *argp)
{
	 struct btrfs_ioctl_search_args *args;
	 struct inode *inode;
	 int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

J
Julia Lawall 已提交
1861 1862 1863
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
1864 1865 1866 1867 1868 1869 1870 1871 1872

	inode = fdentry(file)->d_inode;
	ret = search_ioctl(inode, args);
	if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
		ret = -EFAULT;
	kfree(args);
	return ret;
}

1873
/*
1874 1875 1876
 * Search INODE_REFs to identify path name of 'dirid' directory
 * in a 'tree_id' tree. and sets path name to 'name'.
 */
1877 1878 1879 1880 1881
static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
				u64 tree_id, u64 dirid, char *name)
{
	struct btrfs_root *root;
	struct btrfs_key key;
1882
	char *ptr;
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
	int ret = -1;
	int slot;
	int len;
	int total_len = 0;
	struct btrfs_inode_ref *iref;
	struct extent_buffer *l;
	struct btrfs_path *path;

	if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
		name[0]='\0';
		return 0;
	}

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

1900
	ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1901 1902 1903 1904 1905 1906 1907

	key.objectid = tree_id;
	key.type = BTRFS_ROOT_ITEM_KEY;
	key.offset = (u64)-1;
	root = btrfs_read_fs_root_no_name(info, &key);
	if (IS_ERR(root)) {
		printk(KERN_ERR "could not find root %llu\n", tree_id);
1908 1909
		ret = -ENOENT;
		goto out;
1910 1911 1912 1913
	}

	key.objectid = dirid;
	key.type = BTRFS_INODE_REF_KEY;
1914
	key.offset = (u64)-1;
1915 1916 1917 1918 1919 1920 1921 1922

	while(1) {
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		if (ret < 0)
			goto out;

		l = path->nodes[0];
		slot = path->slots[0];
1923 1924
		if (ret > 0 && slot > 0)
			slot--;
1925 1926 1927
		btrfs_item_key_to_cpu(l, &key, slot);

		if (ret > 0 && (key.objectid != dirid ||
1928 1929
				key.type != BTRFS_INODE_REF_KEY)) {
			ret = -ENOENT;
1930
			goto out;
1931
		}
1932 1933 1934 1935 1936

		iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
		len = btrfs_inode_ref_name_len(l, iref);
		ptr -= len + 1;
		total_len += len + 1;
1937
		if (ptr < name)
1938 1939 1940 1941 1942 1943 1944 1945
			goto out;

		*(ptr + len) = '/';
		read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);

		if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
			break;

1946
		btrfs_release_path(path);
1947
		key.objectid = key.offset;
1948
		key.offset = (u64)-1;
1949 1950
		dirid = key.objectid;
	}
1951
	if (ptr < name)
1952
		goto out;
1953
	memmove(name, ptr, total_len);
1954 1955 1956 1957
	name[total_len]='\0';
	ret = 0;
out:
	btrfs_free_path(path);
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
	return ret;
}

static noinline int btrfs_ioctl_ino_lookup(struct file *file,
					   void __user *argp)
{
	 struct btrfs_ioctl_ino_lookup_args *args;
	 struct inode *inode;
	 int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

J
Julia Lawall 已提交
1971 1972 1973
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
1974

1975 1976
	inode = fdentry(file)->d_inode;

1977 1978 1979
	if (args->treeid == 0)
		args->treeid = BTRFS_I(inode)->root->root_key.objectid;

1980 1981 1982 1983 1984 1985 1986 1987
	ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
					args->treeid, args->objectid,
					args->name);

	if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
		ret = -EFAULT;

	kfree(args);
1988 1989 1990
	return ret;
}

1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
static noinline int btrfs_ioctl_snap_destroy(struct file *file,
					     void __user *arg)
{
	struct dentry *parent = fdentry(file);
	struct dentry *dentry;
	struct inode *dir = parent->d_inode;
	struct inode *inode;
	struct btrfs_root *root = BTRFS_I(dir)->root;
	struct btrfs_root *dest = NULL;
	struct btrfs_ioctl_vol_args *vol_args;
	struct btrfs_trans_handle *trans;
	int namelen;
	int ret;
	int err = 0;

	vol_args = memdup_user(arg, sizeof(*vol_args));
	if (IS_ERR(vol_args))
		return PTR_ERR(vol_args);

	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
	namelen = strlen(vol_args->name);
	if (strchr(vol_args->name, '/') ||
	    strncmp(vol_args->name, "..", namelen) == 0) {
		err = -EINVAL;
		goto out;
	}

2018
	err = mnt_want_write_file(file);
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
	if (err)
		goto out;

	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
	dentry = lookup_one_len(vol_args->name, parent, namelen);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		goto out_unlock_dir;
	}

	if (!dentry->d_inode) {
		err = -ENOENT;
		goto out_dput;
	}

	inode = dentry->d_inode;
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
	dest = BTRFS_I(inode)->root;
	if (!capable(CAP_SYS_ADMIN)){
		/*
		 * Regular user.  Only allow this with a special mount
		 * option, when the user has write+exec access to the
		 * subvol root, and when rmdir(2) would have been
		 * allowed.
		 *
		 * Note that this is _not_ check that the subvol is
		 * empty or doesn't contain data that we wouldn't
		 * otherwise be able to delete.
		 *
		 * Users who want to delete empty subvols should try
		 * rmdir(2).
		 */
		err = -EPERM;
		if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
			goto out_dput;

		/*
		 * Do not allow deletion if the parent dir is the same
		 * as the dir to be deleted.  That means the ioctl
		 * must be called on the dentry referencing the root
		 * of the subvol, not a random directory contained
		 * within it.
		 */
		err = -EINVAL;
		if (root == dest)
			goto out_dput;

		err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
		if (err)
			goto out_dput;

		/* check if subvolume may be deleted by a non-root user */
		err = btrfs_may_delete(dir, dentry, 1);
		if (err)
			goto out_dput;
	}

L
Li Zefan 已提交
2075
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090
		err = -EINVAL;
		goto out_dput;
	}

	mutex_lock(&inode->i_mutex);
	err = d_invalidate(dentry);
	if (err)
		goto out_unlock;

	down_write(&root->fs_info->subvol_sem);

	err = may_destroy_subvol(dest);
	if (err)
		goto out_up_write;

2091 2092 2093
	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
2094
		goto out_up_write;
2095 2096 2097
	}
	trans->block_rsv = &root->fs_info->global_block_rsv;

2098 2099 2100 2101
	ret = btrfs_unlink_subvol(trans, root, dir,
				dest->root_key.objectid,
				dentry->d_name.name,
				dentry->d_name.len);
2102 2103 2104 2105 2106
	if (ret) {
		err = ret;
		btrfs_abort_transaction(trans, root, ret);
		goto out_end_trans;
	}
2107 2108 2109 2110 2111 2112 2113 2114

	btrfs_record_root_in_trans(trans, dest);

	memset(&dest->root_item.drop_progress, 0,
		sizeof(dest->root_item.drop_progress));
	dest->root_item.drop_level = 0;
	btrfs_set_root_refs(&dest->root_item, 0);

2115 2116 2117 2118
	if (!xchg(&dest->orphan_item_inserted, 1)) {
		ret = btrfs_insert_orphan_item(trans,
					root->fs_info->tree_root,
					dest->root_key.objectid);
2119 2120 2121 2122 2123
		if (ret) {
			btrfs_abort_transaction(trans, root, ret);
			err = ret;
			goto out_end_trans;
		}
2124
	}
2125
out_end_trans:
S
Sage Weil 已提交
2126
	ret = btrfs_end_transaction(trans, root);
2127 2128
	if (ret && !err)
		err = ret;
2129 2130 2131 2132 2133 2134
	inode->i_flags |= S_DEAD;
out_up_write:
	up_write(&root->fs_info->subvol_sem);
out_unlock:
	mutex_unlock(&inode->i_mutex);
	if (!err) {
2135
		shrink_dcache_sb(root->fs_info->sb);
2136 2137 2138 2139 2140 2141 2142
		btrfs_invalidate_inodes(dest);
		d_delete(dentry);
	}
out_dput:
	dput(dentry);
out_unlock_dir:
	mutex_unlock(&dir->i_mutex);
A
Al Viro 已提交
2143
	mnt_drop_write_file(file);
2144 2145 2146 2147 2148
out:
	kfree(vol_args);
	return err;
}

C
Chris Mason 已提交
2149
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
C
Christoph Hellwig 已提交
2150 2151 2152
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
C
Chris Mason 已提交
2153
	struct btrfs_ioctl_defrag_range_args *range;
Y
Yan Zheng 已提交
2154 2155
	int ret;

L
Li Zefan 已提交
2156 2157 2158
	if (btrfs_root_readonly(root))
		return -EROFS;

2159
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
2160 2161
	if (ret)
		return ret;
C
Christoph Hellwig 已提交
2162 2163 2164

	switch (inode->i_mode & S_IFMT) {
	case S_IFDIR:
2165 2166 2167 2168
		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto out;
		}
2169 2170 2171 2172
		ret = btrfs_defrag_root(root, 0);
		if (ret)
			goto out;
		ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
C
Christoph Hellwig 已提交
2173 2174
		break;
	case S_IFREG:
2175 2176 2177 2178
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			goto out;
		}
C
Chris Mason 已提交
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190

		range = kzalloc(sizeof(*range), GFP_KERNEL);
		if (!range) {
			ret = -ENOMEM;
			goto out;
		}

		if (argp) {
			if (copy_from_user(range, argp,
					   sizeof(*range))) {
				ret = -EFAULT;
				kfree(range);
2191
				goto out;
C
Chris Mason 已提交
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201
			}
			/* compression requires us to start the IO */
			if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
				range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
				range->extent_thresh = (u32)-1;
			}
		} else {
			/* the rest are all set to zero by kzalloc */
			range->len = (u64)-1;
		}
C
Chris Mason 已提交
2202 2203 2204 2205
		ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
					range, 0, 0);
		if (ret > 0)
			ret = 0;
C
Chris Mason 已提交
2206
		kfree(range);
C
Christoph Hellwig 已提交
2207
		break;
2208 2209
	default:
		ret = -EINVAL;
C
Christoph Hellwig 已提交
2210
	}
2211
out:
A
Al Viro 已提交
2212
	mnt_drop_write_file(file);
2213
	return ret;
C
Christoph Hellwig 已提交
2214 2215
}

2216
static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
C
Christoph Hellwig 已提交
2217 2218 2219 2220
{
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2221 2222 2223
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2224 2225 2226 2227 2228 2229 2230
	mutex_lock(&root->fs_info->volume_mutex);
	if (root->fs_info->balance_ctl) {
		printk(KERN_INFO "btrfs: balance in progress\n");
		ret = -EINVAL;
		goto out;
	}

L
Li Zefan 已提交
2231
	vol_args = memdup_user(arg, sizeof(*vol_args));
2232 2233 2234 2235
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2236

2237
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2238 2239 2240
	ret = btrfs_init_new_device(root, vol_args->name);

	kfree(vol_args);
2241 2242
out:
	mutex_unlock(&root->fs_info->volume_mutex);
C
Christoph Hellwig 已提交
2243 2244 2245
	return ret;
}

2246
static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
C
Christoph Hellwig 已提交
2247 2248 2249 2250
{
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2251 2252 2253
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

Y
Yan Zheng 已提交
2254 2255 2256
	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

2257 2258 2259 2260 2261 2262 2263
	mutex_lock(&root->fs_info->volume_mutex);
	if (root->fs_info->balance_ctl) {
		printk(KERN_INFO "btrfs: balance in progress\n");
		ret = -EINVAL;
		goto out;
	}

L
Li Zefan 已提交
2264
	vol_args = memdup_user(arg, sizeof(*vol_args));
2265 2266 2267 2268
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2269

2270
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2271 2272 2273
	ret = btrfs_rm_device(root, vol_args->name);

	kfree(vol_args);
2274 2275
out:
	mutex_unlock(&root->fs_info->volume_mutex);
C
Christoph Hellwig 已提交
2276 2277 2278
	return ret;
}

J
Jan Schmidt 已提交
2279 2280
static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
{
2281
	struct btrfs_ioctl_fs_info_args *fi_args;
J
Jan Schmidt 已提交
2282 2283 2284
	struct btrfs_device *device;
	struct btrfs_device *next;
	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2285
	int ret = 0;
J
Jan Schmidt 已提交
2286 2287 2288 2289

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2290 2291 2292 2293 2294 2295
	fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
	if (!fi_args)
		return -ENOMEM;

	fi_args->num_devices = fs_devices->num_devices;
	memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
J
Jan Schmidt 已提交
2296 2297 2298

	mutex_lock(&fs_devices->device_list_mutex);
	list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2299 2300
		if (device->devid > fi_args->max_id)
			fi_args->max_id = device->devid;
J
Jan Schmidt 已提交
2301 2302 2303
	}
	mutex_unlock(&fs_devices->device_list_mutex);

2304 2305
	if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
		ret = -EFAULT;
J
Jan Schmidt 已提交
2306

2307 2308
	kfree(fi_args);
	return ret;
J
Jan Schmidt 已提交
2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
}

static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_dev_info_args *di_args;
	struct btrfs_device *dev;
	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
	int ret = 0;
	char *s_uuid = NULL;
	char empty_uuid[BTRFS_UUID_SIZE] = {0};

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	di_args = memdup_user(arg, sizeof(*di_args));
	if (IS_ERR(di_args))
		return PTR_ERR(di_args);

	if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
		s_uuid = di_args->uuid;

	mutex_lock(&fs_devices->device_list_mutex);
	dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL);
	mutex_unlock(&fs_devices->device_list_mutex);

	if (!dev) {
		ret = -ENODEV;
		goto out;
	}

	di_args->devid = dev->devid;
	di_args->bytes_used = dev->bytes_used;
	di_args->total_bytes = dev->total_bytes;
	memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2343
	if (dev->name) {
2344 2345 2346 2347 2348 2349
		struct rcu_string *name;

		rcu_read_lock();
		name = rcu_dereference(dev->name);
		strncpy(di_args->path, name->str, sizeof(di_args->path));
		rcu_read_unlock();
2350 2351
		di_args->path[sizeof(di_args->path) - 1] = 0;
	} else {
2352
		di_args->path[0] = '\0';
2353
	}
J
Jan Schmidt 已提交
2354 2355 2356 2357 2358 2359 2360 2361 2362

out:
	if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
		ret = -EFAULT;

	kfree(di_args);
	return ret;
}

2363 2364
static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
				       u64 off, u64 olen, u64 destoff)
C
Christoph Hellwig 已提交
2365 2366 2367
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
2368
	struct fd src_file;
C
Christoph Hellwig 已提交
2369 2370 2371 2372
	struct inode *src;
	struct btrfs_trans_handle *trans;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
Y
Yan Zheng 已提交
2373 2374
	char *buf;
	struct btrfs_key key;
C
Christoph Hellwig 已提交
2375 2376
	u32 nritems;
	int slot;
Y
Yan Zheng 已提交
2377
	int ret;
2378 2379
	u64 len = olen;
	u64 bs = root->fs_info->sb->s_blocksize;
2380

2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
	/*
	 * TODO:
	 * - split compressed inline extents.  annoying: we need to
	 *   decompress into destination's address_space (the file offset
	 *   may change, so source mapping won't do), then recompress (or
	 *   otherwise reinsert) a subrange.
	 * - allow ranges within the same file to be cloned (provided
	 *   they don't overlap)?
	 */

2391
	/* the destination must be opened for writing */
2392
	if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
2393 2394
		return -EINVAL;

L
Li Zefan 已提交
2395 2396 2397
	if (btrfs_root_readonly(root))
		return -EROFS;

2398
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
2399 2400 2401
	if (ret)
		return ret;

2402 2403
	src_file = fdget(srcfd);
	if (!src_file.file) {
2404 2405 2406
		ret = -EBADF;
		goto out_drop_write;
	}
2407

2408
	ret = -EXDEV;
2409
	if (src_file.file->f_path.mnt != file->f_path.mnt)
2410 2411
		goto out_fput;

2412
	src = src_file.file->f_dentry->d_inode;
C
Christoph Hellwig 已提交
2413

2414 2415 2416 2417
	ret = -EINVAL;
	if (src == inode)
		goto out_fput;

2418
	/* the src must be open for reading */
2419
	if (!(src_file.file->f_mode & FMODE_READ))
2420 2421
		goto out_fput;

2422 2423 2424 2425 2426
	/* don't make the dst file partly checksummed */
	if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
	    (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
		goto out_fput;

Y
Yan Zheng 已提交
2427 2428 2429 2430
	ret = -EISDIR;
	if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
		goto out_fput;

C
Christoph Hellwig 已提交
2431
	ret = -EXDEV;
2432
	if (src->i_sb != inode->i_sb)
Y
Yan Zheng 已提交
2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
		goto out_fput;

	ret = -ENOMEM;
	buf = vmalloc(btrfs_level_size(root, 0));
	if (!buf)
		goto out_fput;

	path = btrfs_alloc_path();
	if (!path) {
		vfree(buf);
C
Christoph Hellwig 已提交
2443
		goto out_fput;
Y
Yan Zheng 已提交
2444 2445
	}
	path->reada = 2;
C
Christoph Hellwig 已提交
2446 2447

	if (inode < src) {
2448 2449
		mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
C
Christoph Hellwig 已提交
2450
	} else {
2451 2452
		mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
C
Christoph Hellwig 已提交
2453 2454
	}

2455 2456
	/* determine range to clone */
	ret = -EINVAL;
2457
	if (off + len > src->i_size || off + len < off)
C
Christoph Hellwig 已提交
2458
		goto out_unlock;
2459 2460 2461 2462
	if (len == 0)
		olen = len = src->i_size - off;
	/* if we extend to eof, continue to block boundary */
	if (off + len == src->i_size)
2463
		len = ALIGN(src->i_size, bs) - off;
2464 2465

	/* verify the end result is block aligned */
2466 2467
	if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
	    !IS_ALIGNED(destoff, bs))
2468 2469
		goto out_unlock;

2470 2471 2472 2473 2474 2475
	if (destoff > inode->i_size) {
		ret = btrfs_cont_expand(inode, inode->i_size, destoff);
		if (ret)
			goto out_unlock;
	}

2476 2477 2478 2479
	/* truncate page cache pages from target inode range */
	truncate_inode_pages_range(&inode->i_data, destoff,
				   PAGE_CACHE_ALIGN(destoff + len) - 1);

C
Christoph Hellwig 已提交
2480 2481 2482
	/* do any pending delalloc/csum calc on src, one way or
	   another, and lock file content */
	while (1) {
Z
Zheng Yan 已提交
2483
		struct btrfs_ordered_extent *ordered;
L
Liu Bo 已提交
2484 2485
		lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
		ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
2486
		if (!ordered &&
L
Liu Bo 已提交
2487 2488
		    !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
				    EXTENT_DELALLOC, 0, NULL))
C
Christoph Hellwig 已提交
2489
			break;
L
Liu Bo 已提交
2490
		unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
Y
Yan Zheng 已提交
2491 2492
		if (ordered)
			btrfs_put_ordered_extent(ordered);
2493
		btrfs_wait_ordered_range(src, off, len);
C
Christoph Hellwig 已提交
2494 2495
	}

2496
	/* clone data */
L
Li Zefan 已提交
2497
	key.objectid = btrfs_ino(src);
Y
Yan Zheng 已提交
2498 2499
	key.type = BTRFS_EXTENT_DATA_KEY;
	key.offset = 0;
C
Christoph Hellwig 已提交
2500 2501 2502 2503 2504 2505

	while (1) {
		/*
		 * note the key will change type as we walk through the
		 * tree.
		 */
2506 2507
		ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
				0, 0);
C
Christoph Hellwig 已提交
2508 2509 2510
		if (ret < 0)
			goto out;

Y
Yan Zheng 已提交
2511 2512
		nritems = btrfs_header_nritems(path->nodes[0]);
		if (path->slots[0] >= nritems) {
2513
			ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
C
Christoph Hellwig 已提交
2514 2515 2516 2517
			if (ret < 0)
				goto out;
			if (ret > 0)
				break;
Y
Yan Zheng 已提交
2518
			nritems = btrfs_header_nritems(path->nodes[0]);
C
Christoph Hellwig 已提交
2519 2520 2521 2522
		}
		leaf = path->nodes[0];
		slot = path->slots[0];

Y
Yan Zheng 已提交
2523
		btrfs_item_key_to_cpu(leaf, &key, slot);
2524
		if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
L
Li Zefan 已提交
2525
		    key.objectid != btrfs_ino(src))
C
Christoph Hellwig 已提交
2526 2527
			break;

2528 2529 2530
		if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
			struct btrfs_file_extent_item *extent;
			int type;
Z
Zheng Yan 已提交
2531 2532
			u32 size;
			struct btrfs_key new_key;
2533 2534 2535
			u64 disko = 0, diskl = 0;
			u64 datao = 0, datal = 0;
			u8 comp;
2536
			u64 endoff;
Z
Zheng Yan 已提交
2537 2538 2539 2540 2541

			size = btrfs_item_size_nr(leaf, slot);
			read_extent_buffer(leaf, buf,
					   btrfs_item_ptr_offset(leaf, slot),
					   size);
2542 2543 2544 2545 2546

			extent = btrfs_item_ptr(leaf, slot,
						struct btrfs_file_extent_item);
			comp = btrfs_file_extent_compression(leaf, extent);
			type = btrfs_file_extent_type(leaf, extent);
2547 2548
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
C
Chris Mason 已提交
2549 2550 2551 2552
				disko = btrfs_file_extent_disk_bytenr(leaf,
								      extent);
				diskl = btrfs_file_extent_disk_num_bytes(leaf,
								 extent);
2553
				datao = btrfs_file_extent_offset(leaf, extent);
C
Chris Mason 已提交
2554 2555
				datal = btrfs_file_extent_num_bytes(leaf,
								    extent);
2556 2557 2558 2559 2560
			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
				/* take upper bound, may be compressed */
				datal = btrfs_file_extent_ram_bytes(leaf,
								    extent);
			}
2561
			btrfs_release_path(path);
Z
Zheng Yan 已提交
2562

2563
			if (key.offset + datal <= off ||
L
Liu Bo 已提交
2564
			    key.offset >= off + len - 1)
2565 2566
				goto next;

Z
Zheng Yan 已提交
2567
			memcpy(&new_key, &key, sizeof(new_key));
L
Li Zefan 已提交
2568
			new_key.objectid = btrfs_ino(inode);
2569 2570 2571 2572
			if (off <= key.offset)
				new_key.offset = key.offset + destoff - off;
			else
				new_key.offset = destoff;
Z
Zheng Yan 已提交
2573

2574 2575 2576 2577 2578 2579
			/*
			 * 1 - adjusting old extent (we may have to split it)
			 * 1 - add new extent
			 * 1 - inode update
			 */
			trans = btrfs_start_transaction(root, 3);
2580 2581 2582 2583 2584
			if (IS_ERR(trans)) {
				ret = PTR_ERR(trans);
				goto out;
			}

2585 2586
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596
				/*
				 *    a  | --- range to clone ---|  b
				 * | ------------- extent ------------- |
				 */

				/* substract range b */
				if (key.offset + datal > off + len)
					datal = off + len - key.offset;

				/* substract range a */
2597 2598 2599 2600 2601
				if (off > key.offset) {
					datao += off - key.offset;
					datal -= off - key.offset;
				}

J
Josef Bacik 已提交
2602
				ret = btrfs_drop_extents(trans, root, inode,
2603 2604
							 new_key.offset,
							 new_key.offset + datal,
2605
							 1);
2606 2607 2608 2609 2610 2611
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
2612

2613 2614
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
2615 2616 2617 2618 2619 2620
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
2621 2622 2623 2624

				leaf = path->nodes[0];
				slot = path->slots[0];
				write_extent_buffer(leaf, buf,
Z
Zheng Yan 已提交
2625 2626
					    btrfs_item_ptr_offset(leaf, slot),
					    size);
Y
Yan Zheng 已提交
2627

2628
				extent = btrfs_item_ptr(leaf, slot,
C
Christoph Hellwig 已提交
2629
						struct btrfs_file_extent_item);
2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640

				/* disko == 0 means it's a hole */
				if (!disko)
					datao = 0;

				btrfs_set_file_extent_offset(leaf, extent,
							     datao);
				btrfs_set_file_extent_num_bytes(leaf, extent,
								datal);
				if (disko) {
					inode_add_bytes(inode, datal);
Y
Yan Zheng 已提交
2641
					ret = btrfs_inc_extent_ref(trans, root,
2642 2643
							disko, diskl, 0,
							root->root_key.objectid,
L
Li Zefan 已提交
2644
							btrfs_ino(inode),
A
Arne Jansen 已提交
2645 2646
							new_key.offset - datao,
							0);
2647 2648 2649 2650 2651 2652 2653 2654 2655
					if (ret) {
						btrfs_abort_transaction(trans,
									root,
									ret);
						btrfs_end_transaction(trans,
								      root);
						goto out;

					}
C
Christoph Hellwig 已提交
2656
				}
2657 2658 2659 2660 2661 2662 2663
			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
				u64 skip = 0;
				u64 trim = 0;
				if (off > key.offset) {
					skip = off - key.offset;
					new_key.offset += skip;
				}
C
Chris Mason 已提交
2664

L
Liu Bo 已提交
2665 2666
				if (key.offset + datal > off + len)
					trim = key.offset + datal - (off + len);
C
Chris Mason 已提交
2667

2668 2669
				if (comp && (skip || trim)) {
					ret = -EINVAL;
2670
					btrfs_end_transaction(trans, root);
2671 2672 2673 2674
					goto out;
				}
				size -= skip + trim;
				datal -= skip + trim;
2675

J
Josef Bacik 已提交
2676
				ret = btrfs_drop_extents(trans, root, inode,
2677 2678
							 new_key.offset,
							 new_key.offset + datal,
2679
							 1);
2680 2681 2682 2683 2684 2685
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
2686

2687 2688
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
2689 2690 2691 2692 2693 2694
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
2695 2696

				if (skip) {
C
Chris Mason 已提交
2697 2698
					u32 start =
					  btrfs_file_extent_calc_inline_size(0);
2699 2700 2701 2702 2703 2704 2705 2706 2707 2708
					memmove(buf+start, buf+start+skip,
						datal);
				}

				leaf = path->nodes[0];
				slot = path->slots[0];
				write_extent_buffer(leaf, buf,
					    btrfs_item_ptr_offset(leaf, slot),
					    size);
				inode_add_bytes(inode, datal);
C
Christoph Hellwig 已提交
2709
			}
2710 2711

			btrfs_mark_buffer_dirty(leaf);
2712
			btrfs_release_path(path);
2713

2714
			inode_inc_iversion(inode);
2715
			inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2716 2717 2718 2719 2720 2721 2722

			/*
			 * we round up to the block size at eof when
			 * determining which extents to clone above,
			 * but shouldn't round up the file size
			 */
			endoff = new_key.offset + datal;
2723 2724
			if (endoff > destoff+olen)
				endoff = destoff+olen;
2725 2726 2727
			if (endoff > inode->i_size)
				btrfs_i_size_write(inode, endoff);

2728
			ret = btrfs_update_inode(trans, root, inode);
2729 2730 2731 2732 2733 2734
			if (ret) {
				btrfs_abort_transaction(trans, root, ret);
				btrfs_end_transaction(trans, root);
				goto out;
			}
			ret = btrfs_end_transaction(trans, root);
2735
		}
C
Chris Mason 已提交
2736
next:
2737
		btrfs_release_path(path);
C
Christoph Hellwig 已提交
2738 2739 2740 2741
		key.offset++;
	}
	ret = 0;
out:
2742
	btrfs_release_path(path);
L
Liu Bo 已提交
2743
	unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
C
Christoph Hellwig 已提交
2744 2745 2746
out_unlock:
	mutex_unlock(&src->i_mutex);
	mutex_unlock(&inode->i_mutex);
Y
Yan Zheng 已提交
2747 2748
	vfree(buf);
	btrfs_free_path(path);
C
Christoph Hellwig 已提交
2749
out_fput:
2750
	fdput(src_file);
2751
out_drop_write:
A
Al Viro 已提交
2752
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
2753 2754 2755
	return ret;
}

2756
static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
2757 2758 2759
{
	struct btrfs_ioctl_clone_range_args args;

2760
	if (copy_from_user(&args, argp, sizeof(args)))
2761 2762 2763 2764 2765
		return -EFAULT;
	return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
				 args.src_length, args.dest_offset);
}

C
Christoph Hellwig 已提交
2766 2767 2768 2769 2770 2771
/*
 * there are many ways the trans_start and trans_end ioctls can lead
 * to deadlocks.  They should only be used by applications that
 * basically own the machine, and have a very in depth understanding
 * of all the possible deadlocks and enospc problems.
 */
2772
static long btrfs_ioctl_trans_start(struct file *file)
C
Christoph Hellwig 已提交
2773 2774 2775 2776
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
2777
	int ret;
C
Christoph Hellwig 已提交
2778

2779
	ret = -EPERM;
2780
	if (!capable(CAP_SYS_ADMIN))
2781
		goto out;
2782

2783 2784
	ret = -EINPROGRESS;
	if (file->private_data)
C
Christoph Hellwig 已提交
2785
		goto out;
2786

L
Li Zefan 已提交
2787 2788 2789 2790
	ret = -EROFS;
	if (btrfs_root_readonly(root))
		goto out;

2791
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
2792 2793 2794
	if (ret)
		goto out;

J
Josef Bacik 已提交
2795
	atomic_inc(&root->fs_info->open_ioctl_trans);
2796

2797
	ret = -ENOMEM;
2798
	trans = btrfs_start_ioctl_transaction(root);
2799
	if (IS_ERR(trans))
2800 2801 2802 2803 2804 2805
		goto out_drop;

	file->private_data = trans;
	return 0;

out_drop:
J
Josef Bacik 已提交
2806
	atomic_dec(&root->fs_info->open_ioctl_trans);
A
Al Viro 已提交
2807
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
2808 2809 2810 2811
out:
	return ret;
}

2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_root *new_root;
	struct btrfs_dir_item *di;
	struct btrfs_trans_handle *trans;
	struct btrfs_path *path;
	struct btrfs_key location;
	struct btrfs_disk_key disk_key;
	u64 objectid = 0;
	u64 dir_id;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (copy_from_user(&objectid, argp, sizeof(objectid)))
		return -EFAULT;

	if (!objectid)
		objectid = root->root_key.objectid;

	location.objectid = objectid;
	location.type = BTRFS_ROOT_ITEM_KEY;
	location.offset = (u64)-1;

	new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
	if (IS_ERR(new_root))
		return PTR_ERR(new_root);

	if (btrfs_root_refs(&new_root->root_item) == 0)
		return -ENOENT;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	path->leave_spinning = 1;

	trans = btrfs_start_transaction(root, 1);
2851
	if (IS_ERR(trans)) {
2852
		btrfs_free_path(path);
2853
		return PTR_ERR(trans);
2854 2855
	}

2856
	dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
2857 2858
	di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
				   dir_id, "default", 7, 1);
2859
	if (IS_ERR_OR_NULL(di)) {
2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871
		btrfs_free_path(path);
		btrfs_end_transaction(trans, root);
		printk(KERN_ERR "Umm, you don't have the default dir item, "
		       "this isn't going to work\n");
		return -ENOENT;
	}

	btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
	btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
	btrfs_mark_buffer_dirty(path->nodes[0]);
	btrfs_free_path(path);

2872
	btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
2873 2874 2875 2876 2877
	btrfs_end_transaction(trans, root);

	return 0;
}

2878 2879
void btrfs_get_block_group_info(struct list_head *groups_list,
				struct btrfs_ioctl_space_info *space)
2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
{
	struct btrfs_block_group_cache *block_group;

	space->total_bytes = 0;
	space->used_bytes = 0;
	space->flags = 0;
	list_for_each_entry(block_group, groups_list, list) {
		space->flags = block_group->flags;
		space->total_bytes += block_group->key.offset;
		space->used_bytes +=
			btrfs_block_group_used(&block_group->item);
	}
}

J
Josef Bacik 已提交
2894 2895 2896 2897 2898
long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_space_args space_args;
	struct btrfs_ioctl_space_info space;
	struct btrfs_ioctl_space_info *dest;
2899
	struct btrfs_ioctl_space_info *dest_orig;
2900
	struct btrfs_ioctl_space_info __user *user_dest;
J
Josef Bacik 已提交
2901
	struct btrfs_space_info *info;
2902 2903 2904 2905 2906
	u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
		       BTRFS_BLOCK_GROUP_SYSTEM,
		       BTRFS_BLOCK_GROUP_METADATA,
		       BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
	int num_types = 4;
2907
	int alloc_size;
J
Josef Bacik 已提交
2908
	int ret = 0;
2909
	u64 slot_count = 0;
2910
	int i, c;
J
Josef Bacik 已提交
2911 2912 2913 2914 2915 2916

	if (copy_from_user(&space_args,
			   (struct btrfs_ioctl_space_args __user *)arg,
			   sizeof(space_args)))
		return -EFAULT;

2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940
	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

		info = NULL;
		rcu_read_lock();
		list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
					list) {
			if (tmp->flags == types[i]) {
				info = tmp;
				break;
			}
		}
		rcu_read_unlock();

		if (!info)
			continue;

		down_read(&info->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&info->block_groups[c]))
				slot_count++;
		}
		up_read(&info->groups_sem);
	}
2941 2942 2943 2944 2945 2946

	/* space_slots == 0 means they are asking for a count */
	if (space_args.space_slots == 0) {
		space_args.total_spaces = slot_count;
		goto out;
	}
2947

2948
	slot_count = min_t(u64, space_args.space_slots, slot_count);
2949

2950
	alloc_size = sizeof(*dest) * slot_count;
2951

2952 2953 2954 2955 2956 2957
	/* we generally have at most 6 or so space infos, one for each raid
	 * level.  So, a whole page should be more than enough for everyone
	 */
	if (alloc_size > PAGE_CACHE_SIZE)
		return -ENOMEM;

J
Josef Bacik 已提交
2958
	space_args.total_spaces = 0;
2959 2960 2961 2962
	dest = kmalloc(alloc_size, GFP_NOFS);
	if (!dest)
		return -ENOMEM;
	dest_orig = dest;
J
Josef Bacik 已提交
2963

2964
	/* now we have a buffer to copy into */
2965 2966 2967
	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

2968 2969 2970
		if (!slot_count)
			break;

2971 2972 2973 2974 2975 2976 2977 2978 2979 2980
		info = NULL;
		rcu_read_lock();
		list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
					list) {
			if (tmp->flags == types[i]) {
				info = tmp;
				break;
			}
		}
		rcu_read_unlock();
2981

2982 2983 2984 2985 2986
		if (!info)
			continue;
		down_read(&info->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&info->block_groups[c])) {
2987 2988
				btrfs_get_block_group_info(
					&info->block_groups[c], &space);
2989 2990 2991
				memcpy(dest, &space, sizeof(space));
				dest++;
				space_args.total_spaces++;
2992
				slot_count--;
2993
			}
2994 2995
			if (!slot_count)
				break;
2996 2997
		}
		up_read(&info->groups_sem);
J
Josef Bacik 已提交
2998 2999
	}

D
Daniel J Blueman 已提交
3000
	user_dest = (struct btrfs_ioctl_space_info __user *)
3001 3002 3003 3004 3005 3006 3007 3008
		(arg + sizeof(struct btrfs_ioctl_space_args));

	if (copy_to_user(user_dest, dest_orig, alloc_size))
		ret = -EFAULT;

	kfree(dest_orig);
out:
	if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
J
Josef Bacik 已提交
3009 3010 3011 3012 3013
		ret = -EFAULT;

	return ret;
}

C
Christoph Hellwig 已提交
3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
/*
 * there are many ways the trans_start and trans_end ioctls can lead
 * to deadlocks.  They should only be used by applications that
 * basically own the machine, and have a very in depth understanding
 * of all the possible deadlocks and enospc problems.
 */
long btrfs_ioctl_trans_end(struct file *file)
{
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;

	trans = file->private_data;
3027 3028
	if (!trans)
		return -EINVAL;
C
Christoph Hellwig 已提交
3029
	file->private_data = NULL;
3030

3031 3032
	btrfs_end_transaction(trans, root);

J
Josef Bacik 已提交
3033
	atomic_dec(&root->fs_info->open_ioctl_trans);
3034

A
Al Viro 已提交
3035
	mnt_drop_write_file(file);
3036
	return 0;
C
Christoph Hellwig 已提交
3037 3038
}

3039 3040 3041 3042 3043
static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
{
	struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
	struct btrfs_trans_handle *trans;
	u64 transid;
T
Tsutomu Itoh 已提交
3044
	int ret;
3045 3046

	trans = btrfs_start_transaction(root, 0);
3047 3048
	if (IS_ERR(trans))
		return PTR_ERR(trans);
3049
	transid = trans->transid;
T
Tsutomu Itoh 已提交
3050
	ret = btrfs_commit_transaction_async(trans, root, 0);
3051 3052
	if (ret) {
		btrfs_end_transaction(trans, root);
T
Tsutomu Itoh 已提交
3053
		return ret;
3054
	}
3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075

	if (argp)
		if (copy_to_user(argp, &transid, sizeof(transid)))
			return -EFAULT;
	return 0;
}

static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
{
	struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
	u64 transid;

	if (argp) {
		if (copy_from_user(&transid, argp, sizeof(transid)))
			return -EFAULT;
	} else {
		transid = 0;  /* current trans */
	}
	return btrfs_wait_for_commit(root, transid);
}

J
Jan Schmidt 已提交
3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088
static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
{
	int ret;
	struct btrfs_ioctl_scrub_args *sa;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,
A
Arne Jansen 已提交
3089
			      &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
J
Jan Schmidt 已提交
3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127

	if (copy_to_user(arg, sa, sizeof(*sa)))
		ret = -EFAULT;

	kfree(sa);
	return ret;
}

static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	return btrfs_scrub_cancel(root);
}

static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
				       void __user *arg)
{
	struct btrfs_ioctl_scrub_args *sa;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);

	if (copy_to_user(arg, sa, sizeof(*sa)))
		ret = -EFAULT;

	kfree(sa);
	return ret;
}

3128
static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3129
				      void __user *arg)
3130 3131 3132 3133 3134 3135 3136 3137
{
	struct btrfs_ioctl_get_dev_stats *sa;
	int ret;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

3138 3139 3140 3141 3142 3143
	if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
		kfree(sa);
		return -EPERM;
	}

	ret = btrfs_get_dev_stats(root, sa);
3144 3145 3146 3147 3148 3149 3150 3151

	if (copy_to_user(arg, sa, sizeof(*sa)))
		ret = -EFAULT;

	kfree(sa);
	return ret;
}

3152 3153 3154 3155
static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
{
	int ret = 0;
	int i;
3156
	u64 rel_ptr;
3157
	int size;
3158
	struct btrfs_ioctl_ino_path_args *ipa = NULL;
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_path *path;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	path = btrfs_alloc_path();
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}

	ipa = memdup_user(arg, sizeof(*ipa));
	if (IS_ERR(ipa)) {
		ret = PTR_ERR(ipa);
		ipa = NULL;
		goto out;
	}

	size = min_t(u32, ipa->size, 4096);
	ipath = init_ipath(size, root, path);
	if (IS_ERR(ipath)) {
		ret = PTR_ERR(ipath);
		ipath = NULL;
		goto out;
	}

	ret = paths_from_inode(ipa->inum, ipath);
	if (ret < 0)
		goto out;

	for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3191 3192
		rel_ptr = ipath->fspath->val[i] -
			  (u64)(unsigned long)ipath->fspath->val;
3193
		ipath->fspath->val[i] = rel_ptr;
3194 3195
	}

3196 3197
	ret = copy_to_user((void *)(unsigned long)ipa->fspath,
			   (void *)(unsigned long)ipath->fspath, size);
3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
	if (ret) {
		ret = -EFAULT;
		goto out;
	}

out:
	btrfs_free_path(path);
	free_ipath(ipath);
	kfree(ipa);

	return ret;
}

static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
{
	struct btrfs_data_container *inodes = ctx;
	const size_t c = 3 * sizeof(u64);

	if (inodes->bytes_left >= c) {
		inodes->bytes_left -= c;
		inodes->val[inodes->elem_cnt] = inum;
		inodes->val[inodes->elem_cnt + 1] = offset;
		inodes->val[inodes->elem_cnt + 2] = root;
		inodes->elem_cnt += 3;
	} else {
		inodes->bytes_missing += c - inodes->bytes_left;
		inodes->bytes_left = 0;
		inodes->elem_missed += 3;
	}

	return 0;
}

static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
					void __user *arg)
{
	int ret = 0;
	int size;
	struct btrfs_ioctl_logical_ino_args *loi;
	struct btrfs_data_container *inodes = NULL;
	struct btrfs_path *path = NULL;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	loi = memdup_user(arg, sizeof(*loi));
	if (IS_ERR(loi)) {
		ret = PTR_ERR(loi);
		loi = NULL;
		goto out;
	}

	path = btrfs_alloc_path();
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}

3256
	size = min_t(u32, loi->size, 64 * 1024);
3257 3258 3259 3260 3261 3262 3263
	inodes = init_data_container(size);
	if (IS_ERR(inodes)) {
		ret = PTR_ERR(inodes);
		inodes = NULL;
		goto out;
	}

L
Liu Bo 已提交
3264 3265 3266
	ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
					  build_ino_list, inodes);
	if (ret == -EINVAL)
3267 3268 3269 3270
		ret = -ENOENT;
	if (ret < 0)
		goto out;

3271 3272
	ret = copy_to_user((void *)(unsigned long)loi->inodes,
			   (void *)(unsigned long)inodes, size);
3273 3274 3275 3276 3277
	if (ret)
		ret = -EFAULT;

out:
	btrfs_free_path(path);
3278
	vfree(inodes);
3279 3280 3281 3282 3283
	kfree(loi);

	return ret;
}

3284
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3285 3286 3287 3288 3289 3290
			       struct btrfs_ioctl_balance_args *bargs)
{
	struct btrfs_balance_control *bctl = fs_info->balance_ctl;

	bargs->flags = bctl->flags;

3291 3292 3293 3294
	if (atomic_read(&fs_info->balance_running))
		bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
	if (atomic_read(&fs_info->balance_pause_req))
		bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3295 3296
	if (atomic_read(&fs_info->balance_cancel_req))
		bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3297

3298 3299 3300
	memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
	memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
	memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3301 3302 3303 3304 3305 3306 3307 3308

	if (lock) {
		spin_lock(&fs_info->balance_lock);
		memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
		spin_unlock(&fs_info->balance_lock);
	} else {
		memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
	}
3309 3310
}

3311
static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3312
{
3313
	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3314 3315 3316 3317 3318 3319 3320 3321
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_ioctl_balance_args *bargs;
	struct btrfs_balance_control *bctl;
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

3322
	ret = mnt_want_write_file(file);
3323 3324 3325
	if (ret)
		return ret;

3326 3327 3328 3329 3330 3331 3332 3333 3334
	mutex_lock(&fs_info->volume_mutex);
	mutex_lock(&fs_info->balance_mutex);

	if (arg) {
		bargs = memdup_user(arg, sizeof(*bargs));
		if (IS_ERR(bargs)) {
			ret = PTR_ERR(bargs);
			goto out;
		}
3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348

		if (bargs->flags & BTRFS_BALANCE_RESUME) {
			if (!fs_info->balance_ctl) {
				ret = -ENOTCONN;
				goto out_bargs;
			}

			bctl = fs_info->balance_ctl;
			spin_lock(&fs_info->balance_lock);
			bctl->flags |= BTRFS_BALANCE_RESUME;
			spin_unlock(&fs_info->balance_lock);

			goto do_balance;
		}
3349 3350 3351 3352
	} else {
		bargs = NULL;
	}

3353 3354 3355 3356 3357
	if (fs_info->balance_ctl) {
		ret = -EINPROGRESS;
		goto out_bargs;
	}

3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370
	bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
	if (!bctl) {
		ret = -ENOMEM;
		goto out_bargs;
	}

	bctl->fs_info = fs_info;
	if (arg) {
		memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
		memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
		memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));

		bctl->flags = bargs->flags;
3371 3372 3373
	} else {
		/* balance everything - no filters */
		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
3374 3375
	}

3376
do_balance:
3377 3378
	ret = btrfs_balance(bctl, bargs);
	/*
3379 3380
	 * bctl is freed in __cancel_balance or in free_fs_info if
	 * restriper was paused all the way until unmount
3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391
	 */
	if (arg) {
		if (copy_to_user(arg, bargs, sizeof(*bargs)))
			ret = -EFAULT;
	}

out_bargs:
	kfree(bargs);
out:
	mutex_unlock(&fs_info->balance_mutex);
	mutex_unlock(&fs_info->volume_mutex);
3392
	mnt_drop_write_file(file);
3393 3394 3395
	return ret;
}

3396 3397 3398 3399 3400 3401 3402 3403
static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	switch (cmd) {
	case BTRFS_BALANCE_CTL_PAUSE:
		return btrfs_pause_balance(root->fs_info);
3404 3405
	case BTRFS_BALANCE_CTL_CANCEL:
		return btrfs_cancel_balance(root->fs_info);
3406 3407 3408 3409 3410
	}

	return -EINVAL;
}

3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443
static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
					 void __user *arg)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_ioctl_balance_args *bargs;
	int ret = 0;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	mutex_lock(&fs_info->balance_mutex);
	if (!fs_info->balance_ctl) {
		ret = -ENOTCONN;
		goto out;
	}

	bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
	if (!bargs) {
		ret = -ENOMEM;
		goto out;
	}

	update_ioctl_balance_args(fs_info, 1, bargs);

	if (copy_to_user(arg, bargs, sizeof(*bargs)))
		ret = -EFAULT;

	kfree(bargs);
out:
	mutex_unlock(&fs_info->balance_mutex);
	return ret;
}

A
Arne Jansen 已提交
3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620
static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_quota_ctl_args *sa;
	struct btrfs_trans_handle *trans = NULL;
	int ret;
	int err;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
		trans = btrfs_start_transaction(root, 2);
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
			goto out;
		}
	}

	switch (sa->cmd) {
	case BTRFS_QUOTA_CTL_ENABLE:
		ret = btrfs_quota_enable(trans, root->fs_info);
		break;
	case BTRFS_QUOTA_CTL_DISABLE:
		ret = btrfs_quota_disable(trans, root->fs_info);
		break;
	case BTRFS_QUOTA_CTL_RESCAN:
		ret = btrfs_quota_rescan(root->fs_info);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	if (copy_to_user(arg, sa, sizeof(*sa)))
		ret = -EFAULT;

	if (trans) {
		err = btrfs_commit_transaction(trans, root);
		if (err && !ret)
			ret = err;
	}

out:
	kfree(sa);
	return ret;
}

static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_qgroup_assign_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;
	}

	/* FIXME: check if the IDs really exist */
	if (sa->assign) {
		ret = btrfs_add_qgroup_relation(trans, root->fs_info,
						sa->src, sa->dst);
	} else {
		ret = btrfs_del_qgroup_relation(trans, root->fs_info,
						sa->src, sa->dst);
	}

	err = btrfs_end_transaction(trans, root);
	if (err && !ret)
		ret = err;

out:
	kfree(sa);
	return ret;
}

static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_qgroup_create_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;
	}

	/* FIXME: check if the IDs really exist */
	if (sa->create) {
		ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
					  NULL);
	} else {
		ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
	}

	err = btrfs_end_transaction(trans, root);
	if (err && !ret)
		ret = err;

out:
	kfree(sa);
	return ret;
}

static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_qgroup_limit_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;
	u64 qgroupid;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (root->fs_info->sb->s_flags & MS_RDONLY)
		return -EROFS;

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa))
		return PTR_ERR(sa);

	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;
	}

	qgroupid = sa->qgroupid;
	if (!qgroupid) {
		/* take the current subvol as qgroup */
		qgroupid = root->root_key.objectid;
	}

	/* FIXME: check if the IDs really exist */
	ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);

	err = btrfs_end_transaction(trans, root);
	if (err && !ret)
		ret = err;

out:
	kfree(sa);
	return ret;
}

3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701
static long btrfs_ioctl_set_received_subvol(struct file *file,
					    void __user *arg)
{
	struct btrfs_ioctl_received_subvol_args *sa = NULL;
	struct inode *inode = fdentry(file)->d_inode;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_root_item *root_item = &root->root_item;
	struct btrfs_trans_handle *trans;
	struct timespec ct = CURRENT_TIME;
	int ret = 0;

	ret = mnt_want_write_file(file);
	if (ret < 0)
		return ret;

	down_write(&root->fs_info->subvol_sem);

	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
		ret = -EINVAL;
		goto out;
	}

	if (btrfs_root_readonly(root)) {
		ret = -EROFS;
		goto out;
	}

	if (!inode_owner_or_capable(inode)) {
		ret = -EACCES;
		goto out;
	}

	sa = memdup_user(arg, sizeof(*sa));
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		sa = NULL;
		goto out;
	}

	trans = btrfs_start_transaction(root, 1);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		trans = NULL;
		goto out;
	}

	sa->rtransid = trans->transid;
	sa->rtime.sec = ct.tv_sec;
	sa->rtime.nsec = ct.tv_nsec;

	memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
	btrfs_set_root_stransid(root_item, sa->stransid);
	btrfs_set_root_rtransid(root_item, sa->rtransid);
	root_item->stime.sec = cpu_to_le64(sa->stime.sec);
	root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
	root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
	root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);

	ret = btrfs_update_root(trans, root->fs_info->tree_root,
				&root->root_key, &root->root_item);
	if (ret < 0) {
		btrfs_end_transaction(trans, root);
		trans = NULL;
		goto out;
	} else {
		ret = btrfs_commit_transaction(trans, root);
		if (ret < 0)
			goto out;
	}

	ret = copy_to_user(arg, sa, sizeof(*sa));
	if (ret)
		ret = -EFAULT;

out:
	kfree(sa);
	up_write(&root->fs_info->subvol_sem);
	mnt_drop_write_file(file);
	return ret;
}

C
Christoph Hellwig 已提交
3702 3703 3704 3705
long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
{
	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3706
	void __user *argp = (void __user *)arg;
C
Christoph Hellwig 已提交
3707 3708

	switch (cmd) {
3709 3710 3711 3712 3713 3714
	case FS_IOC_GETFLAGS:
		return btrfs_ioctl_getflags(file, argp);
	case FS_IOC_SETFLAGS:
		return btrfs_ioctl_setflags(file, argp);
	case FS_IOC_GETVERSION:
		return btrfs_ioctl_getversion(file, argp);
3715 3716
	case FITRIM:
		return btrfs_ioctl_fitrim(file, argp);
C
Christoph Hellwig 已提交
3717
	case BTRFS_IOC_SNAP_CREATE:
3718
		return btrfs_ioctl_snap_create(file, argp, 0);
3719
	case BTRFS_IOC_SNAP_CREATE_V2:
3720
		return btrfs_ioctl_snap_create_v2(file, argp, 0);
3721
	case BTRFS_IOC_SUBVOL_CREATE:
3722
		return btrfs_ioctl_snap_create(file, argp, 1);
A
Arne Jansen 已提交
3723 3724
	case BTRFS_IOC_SUBVOL_CREATE_V2:
		return btrfs_ioctl_snap_create_v2(file, argp, 1);
3725 3726
	case BTRFS_IOC_SNAP_DESTROY:
		return btrfs_ioctl_snap_destroy(file, argp);
3727 3728 3729 3730
	case BTRFS_IOC_SUBVOL_GETFLAGS:
		return btrfs_ioctl_subvol_getflags(file, argp);
	case BTRFS_IOC_SUBVOL_SETFLAGS:
		return btrfs_ioctl_subvol_setflags(file, argp);
3731 3732
	case BTRFS_IOC_DEFAULT_SUBVOL:
		return btrfs_ioctl_default_subvol(file, argp);
C
Christoph Hellwig 已提交
3733
	case BTRFS_IOC_DEFRAG:
C
Chris Mason 已提交
3734 3735 3736
		return btrfs_ioctl_defrag(file, NULL);
	case BTRFS_IOC_DEFRAG_RANGE:
		return btrfs_ioctl_defrag(file, argp);
C
Christoph Hellwig 已提交
3737
	case BTRFS_IOC_RESIZE:
3738
		return btrfs_ioctl_resize(root, argp);
C
Christoph Hellwig 已提交
3739
	case BTRFS_IOC_ADD_DEV:
3740
		return btrfs_ioctl_add_dev(root, argp);
C
Christoph Hellwig 已提交
3741
	case BTRFS_IOC_RM_DEV:
3742
		return btrfs_ioctl_rm_dev(root, argp);
J
Jan Schmidt 已提交
3743 3744 3745 3746
	case BTRFS_IOC_FS_INFO:
		return btrfs_ioctl_fs_info(root, argp);
	case BTRFS_IOC_DEV_INFO:
		return btrfs_ioctl_dev_info(root, argp);
C
Christoph Hellwig 已提交
3747
	case BTRFS_IOC_BALANCE:
3748
		return btrfs_ioctl_balance(file, NULL);
C
Christoph Hellwig 已提交
3749
	case BTRFS_IOC_CLONE:
3750 3751
		return btrfs_ioctl_clone(file, arg, 0, 0, 0);
	case BTRFS_IOC_CLONE_RANGE:
3752
		return btrfs_ioctl_clone_range(file, argp);
C
Christoph Hellwig 已提交
3753 3754 3755 3756
	case BTRFS_IOC_TRANS_START:
		return btrfs_ioctl_trans_start(file);
	case BTRFS_IOC_TRANS_END:
		return btrfs_ioctl_trans_end(file);
3757 3758 3759 3760
	case BTRFS_IOC_TREE_SEARCH:
		return btrfs_ioctl_tree_search(file, argp);
	case BTRFS_IOC_INO_LOOKUP:
		return btrfs_ioctl_ino_lookup(file, argp);
3761 3762 3763 3764
	case BTRFS_IOC_INO_PATHS:
		return btrfs_ioctl_ino_to_path(root, argp);
	case BTRFS_IOC_LOGICAL_INO:
		return btrfs_ioctl_logical_to_ino(root, argp);
J
Josef Bacik 已提交
3765 3766
	case BTRFS_IOC_SPACE_INFO:
		return btrfs_ioctl_space_info(root, argp);
C
Christoph Hellwig 已提交
3767 3768 3769
	case BTRFS_IOC_SYNC:
		btrfs_sync_fs(file->f_dentry->d_sb, 1);
		return 0;
3770 3771 3772 3773
	case BTRFS_IOC_START_SYNC:
		return btrfs_ioctl_start_sync(file, argp);
	case BTRFS_IOC_WAIT_SYNC:
		return btrfs_ioctl_wait_sync(file, argp);
J
Jan Schmidt 已提交
3774 3775 3776 3777 3778 3779
	case BTRFS_IOC_SCRUB:
		return btrfs_ioctl_scrub(root, argp);
	case BTRFS_IOC_SCRUB_CANCEL:
		return btrfs_ioctl_scrub_cancel(root, argp);
	case BTRFS_IOC_SCRUB_PROGRESS:
		return btrfs_ioctl_scrub_progress(root, argp);
3780
	case BTRFS_IOC_BALANCE_V2:
3781
		return btrfs_ioctl_balance(file, argp);
3782 3783
	case BTRFS_IOC_BALANCE_CTL:
		return btrfs_ioctl_balance_ctl(root, arg);
3784 3785
	case BTRFS_IOC_BALANCE_PROGRESS:
		return btrfs_ioctl_balance_progress(root, argp);
3786 3787
	case BTRFS_IOC_SET_RECEIVED_SUBVOL:
		return btrfs_ioctl_set_received_subvol(file, argp);
3788 3789
	case BTRFS_IOC_SEND:
		return btrfs_ioctl_send(file, argp);
3790
	case BTRFS_IOC_GET_DEV_STATS:
3791
		return btrfs_ioctl_get_dev_stats(root, argp);
A
Arne Jansen 已提交
3792 3793 3794 3795 3796 3797 3798 3799
	case BTRFS_IOC_QUOTA_CTL:
		return btrfs_ioctl_quota_ctl(root, argp);
	case BTRFS_IOC_QGROUP_ASSIGN:
		return btrfs_ioctl_qgroup_assign(root, argp);
	case BTRFS_IOC_QGROUP_CREATE:
		return btrfs_ioctl_qgroup_create(root, argp);
	case BTRFS_IOC_QGROUP_LIMIT:
		return btrfs_ioctl_qgroup_limit(root, argp);
C
Christoph Hellwig 已提交
3800 3801 3802 3803
	}

	return -ENOTTY;
}