ioctl.c 116.7 KB
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Christoph Hellwig 已提交
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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 <linux/btrfs.h>
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#include <linux/uaccess.h>
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#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.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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#include "dev-replace.h"
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#include "props.h"
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#include "sysfs.h"
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#ifdef CONFIG_64BIT
/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
 * structures are incorrect, as the timespec structure from userspace
 * is 4 bytes too small. We define these alternatives here to teach
 * the kernel about the 32-bit struct packing.
 */
struct btrfs_ioctl_timespec_32 {
	__u64 sec;
	__u32 nsec;
} __attribute__ ((__packed__));

struct btrfs_ioctl_received_subvol_args_32 {
	char	uuid[BTRFS_UUID_SIZE];	/* in */
	__u64	stransid;		/* in */
	__u64	rtransid;		/* out */
	struct btrfs_ioctl_timespec_32 stime; /* in */
	struct btrfs_ioctl_timespec_32 rtime; /* out */
	__u64	flags;			/* in */
	__u64	reserved[16];		/* in */
} __attribute__ ((__packed__));

#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
				struct btrfs_ioctl_received_subvol_args_32)
#endif


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static int btrfs_clone(struct inode *src, struct inode *inode,
		       u64 off, u64 olen, u64 olen_aligned, u64 destoff);

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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;
	}

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	if (flags & BTRFS_INODE_NODATACOW) {
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		BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
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		if (S_ISREG(inode->i_mode))
			BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
	}
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	btrfs_update_iflags(inode);
}

static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
{
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	struct btrfs_inode *ip = BTRFS_I(file_inode(file));
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	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)
{
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	struct inode *inode = file_inode(file);
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	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 (!inode_owner_or_capable(inode))
		return -EPERM;

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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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	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;
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		ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
		if (ret && ret != -ENODATA)
			goto out_drop;
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	} else if (flags & FS_COMPR_FL) {
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		const char *comp;

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		ip->flags |= BTRFS_INODE_COMPRESS;
		ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
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		if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
			comp = "lzo";
		else
			comp = "zlib";
		ret = btrfs_set_prop(inode, "btrfs.compression",
				     comp, strlen(comp), 0);
		if (ret)
			goto out_drop;

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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)
{
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	struct inode *inode = file_inode(file);
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	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(file_inode(file)->i_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);
		}
	}
391
	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)
399
		return -EINVAL;
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401
	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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int btrfs_is_empty_uuid(u8 *uuid)
{
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	int i;

	for (i = 0; i < BTRFS_UUID_SIZE; i++) {
		if (uuid[i])
			return 0;
	}
	return 1;
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}

424
static noinline int create_subvol(struct inode *dir,
425
				  struct dentry *dentry,
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				  char *name, int namelen,
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				  u64 *async_transid,
428
				  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 *root = BTRFS_I(dir)->root;
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	struct btrfs_root *new_root;
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	struct btrfs_block_rsv block_rsv;
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	struct timespec cur_time = CURRENT_TIME;
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	struct inode *inode;
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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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	u64 qgroup_reserved;
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	uuid_le new_uuid;
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448
	ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
449
	if (ret)
450
		return ret;
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452
	btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
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	/*
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	 * The same as the snapshot creation, please see the comment
	 * of create_snapshot().
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	 */
457
	ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
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					       8, &qgroup_reserved, false);
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	if (ret)
		return ret;

	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
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		btrfs_subvolume_release_metadata(root, &block_rsv,
						 qgroup_reserved);
		return ret;
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	}
	trans->block_rsv = &block_rsv;
	trans->bytes_reserved = block_rsv.size;
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	ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
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	if (ret)
		goto fail;

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	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
477
				      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);

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	write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
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			    BTRFS_FSID_SIZE);
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	write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
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			    btrfs_header_chunk_tree_uuid(leaf),
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			    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;
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	btrfs_set_stack_inode_generation(inode_item, 1);
	btrfs_set_stack_inode_size(inode_item, 3);
	btrfs_set_stack_inode_nlink(inode_item, 1);
	btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
	btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
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	btrfs_set_root_flags(&root_item, 0);
	btrfs_set_root_limit(&root_item, 0);
	btrfs_set_stack_inode_flags(inode_item, 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);
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	btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
	btrfs_set_stack_timespec_nsec(&root_item.otime, 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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526
	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, 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;
	}

C
Christoph Hellwig 已提交
557 558 559
	/*
	 * insert the directory item
	 */
560
	ret = btrfs_set_inode_index(dir, &index);
561 562 563 564
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
		goto fail;
	}
565 566

	ret = btrfs_insert_dir_item(trans, root,
567
				    name, namelen, dir, &key,
568
				    BTRFS_FT_DIR, index);
569 570
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
C
Christoph Hellwig 已提交
571
		goto fail;
572
	}
573

574 575 576 577
	btrfs_i_size_write(dir, dir->i_size + namelen * 2);
	ret = btrfs_update_inode(trans, root, dir);
	BUG_ON(ret);

578
	ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
579
				 objectid, root->root_key.objectid,
L
Li Zefan 已提交
580
				 btrfs_ino(dir), index, name, namelen);
581
	BUG_ON(ret);
C
Christoph Hellwig 已提交
582

583 584 585 586 587 588
	ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
				  root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
				  objectid);
	if (ret)
		btrfs_abort_transaction(trans, root, ret);

C
Christoph Hellwig 已提交
589
fail:
590 591
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
592 593
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);

S
Sage Weil 已提交
594 595 596
	if (async_transid) {
		*async_transid = trans->transid;
		err = btrfs_commit_transaction_async(trans, root, 1);
597 598
		if (err)
			err = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
599 600 601
	} else {
		err = btrfs_commit_transaction(trans, root);
	}
C
Christoph Hellwig 已提交
602 603
	if (err && !ret)
		ret = err;
604

605 606
	if (!ret) {
		inode = btrfs_lookup_dentry(dir, dentry);
607 608
		if (IS_ERR(inode))
			return PTR_ERR(inode);
609 610
		d_instantiate(dentry, inode);
	}
C
Christoph Hellwig 已提交
611 612 613
	return ret;
}

614 615 616 617
static int create_snapshot(struct btrfs_root *root, struct inode *dir,
			   struct dentry *dentry, char *name, int namelen,
			   u64 *async_transid, bool readonly,
			   struct btrfs_qgroup_inherit *inherit)
C
Christoph Hellwig 已提交
618
{
619
	struct inode *inode;
C
Christoph Hellwig 已提交
620 621
	struct btrfs_pending_snapshot *pending_snapshot;
	struct btrfs_trans_handle *trans;
622
	int ret;
C
Christoph Hellwig 已提交
623 624 625 626

	if (!root->ref_cows)
		return -EINVAL;

627 628 629 630
	ret = btrfs_start_delalloc_inodes(root, 0);
	if (ret)
		return ret;

631
	btrfs_wait_ordered_extents(root, -1);
632

633
	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
634 635 636
	if (!pending_snapshot)
		return -ENOMEM;

637 638
	btrfs_init_block_rsv(&pending_snapshot->block_rsv,
			     BTRFS_BLOCK_RSV_TEMP);
639 640 641 642 643 644
	/*
	 * 1 - parent dir inode
	 * 2 - dir entries
	 * 1 - root item
	 * 2 - root ref/backref
	 * 1 - root of snapshot
645
	 * 1 - UUID item
646 647
	 */
	ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
648
					&pending_snapshot->block_rsv, 8,
649 650
					&pending_snapshot->qgroup_reserved,
					false);
651 652 653
	if (ret)
		goto out;

654
	pending_snapshot->dentry = dentry;
C
Christoph Hellwig 已提交
655
	pending_snapshot->root = root;
L
Li Zefan 已提交
656
	pending_snapshot->readonly = readonly;
657
	pending_snapshot->dir = dir;
658
	pending_snapshot->inherit = inherit;
659

660
	trans = btrfs_start_transaction(root, 0);
661 662 663 664 665
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto fail;
	}

666
	spin_lock(&root->fs_info->trans_lock);
C
Christoph Hellwig 已提交
667 668
	list_add(&pending_snapshot->list,
		 &trans->transaction->pending_snapshots);
669
	spin_unlock(&root->fs_info->trans_lock);
S
Sage Weil 已提交
670 671 672 673
	if (async_transid) {
		*async_transid = trans->transid;
		ret = btrfs_commit_transaction_async(trans,
				     root->fs_info->extent_root, 1);
674 675
		if (ret)
			ret = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
676 677 678 679
	} else {
		ret = btrfs_commit_transaction(trans,
					       root->fs_info->extent_root);
	}
680
	if (ret)
681
		goto fail;
682 683 684 685 686

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

687 688 689
	ret = btrfs_orphan_cleanup(pending_snapshot->snap);
	if (ret)
		goto fail;
C
Christoph Hellwig 已提交
690

691
	inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
692 693 694 695
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto fail;
	}
696

697 698 699
	d_instantiate(dentry, inode);
	ret = 0;
fail:
700 701 702 703
	btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
					 &pending_snapshot->block_rsv,
					 pending_snapshot->qgroup_reserved);
out:
704
	kfree(pending_snapshot);
C
Christoph Hellwig 已提交
705 706 707
	return ret;
}

708 709 710 711 712 713
/*  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)
{
714
	kuid_t fsuid = current_fsuid();
715 716 717

	if (!(dir->i_mode & S_ISVTX))
		return 0;
718
	if (uid_eq(inode->i_uid, fsuid))
719
		return 0;
720
	if (uid_eq(dir->i_uid, fsuid))
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
		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().
 */

745
static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
746 747 748 749 750 751 752
{
	int error;

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

	BUG_ON(victim->d_parent->d_inode != dir);
753
	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777

	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;
}

778 779 780 781 782 783 784 785 786 787 788 789 790 791 792
/* 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.
 */
793 794
static noinline int btrfs_mksubvol(struct path *parent,
				   char *name, int namelen,
S
Sage Weil 已提交
795
				   struct btrfs_root *snap_src,
A
Arne Jansen 已提交
796
				   u64 *async_transid, bool readonly,
797
				   struct btrfs_qgroup_inherit *inherit)
798
{
799
	struct inode *dir  = parent->dentry->d_inode;
800 801 802
	struct dentry *dentry;
	int error;

803 804 805
	error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (error == -EINTR)
		return error;
806 807 808 809 810 811 812 813 814 815

	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;

816
	error = btrfs_may_create(dir, dentry);
817
	if (error)
818
		goto out_dput;
819

C
Chris Mason 已提交
820 821 822 823 824 825 826 827 828 829
	/*
	 * even if this name doesn't exist, we may get hash collisions.
	 * check for them now when we can safely fail
	 */
	error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
					       dir->i_ino, name,
					       namelen);
	if (error)
		goto out_dput;

830 831 832 833 834
	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;

835
	if (snap_src) {
836
		error = create_snapshot(snap_src, dir, dentry, name, namelen,
A
Arne Jansen 已提交
837
					async_transid, readonly, inherit);
838
	} else {
839 840
		error = create_subvol(dir, dentry, name, namelen,
				      async_transid, inherit);
841
	}
842 843 844 845
	if (!error)
		fsnotify_mkdir(dir, dentry);
out_up_read:
	up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
846 847 848
out_dput:
	dput(dentry);
out_unlock:
849
	mutex_unlock(&dir->i_mutex);
850 851 852
	return error;
}

C
Chris Mason 已提交
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
/*
 * 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 extent_buffer *leaf;
	struct btrfs_file_extent_item *extent;
	int type;
	int ret;
903
	u64 ino = btrfs_ino(inode);
C
Chris Mason 已提交
904 905 906 907 908

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

909
	min_key.objectid = ino;
C
Chris Mason 已提交
910 911 912 913 914
	min_key.type = BTRFS_EXTENT_DATA_KEY;
	min_key.offset = *off;

	path->keep_locks = 1;

915
	while (1) {
916
		ret = btrfs_search_forward(root, &min_key, path, newer_than);
C
Chris Mason 已提交
917 918
		if (ret != 0)
			goto none;
919
		if (min_key.objectid != ino)
C
Chris Mason 已提交
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
			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
948
static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
949 950
{
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
L
Li Zefan 已提交
951 952 953
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
	struct extent_map *em;
	u64 len = PAGE_CACHE_SIZE;
954

L
Li Zefan 已提交
955 956 957 958
	/*
	 * hopefully we have this extent in the tree already, try without
	 * the full extent lock
	 */
959
	read_lock(&em_tree->lock);
L
Li Zefan 已提交
960
	em = lookup_extent_mapping(em_tree, start, len);
961 962
	read_unlock(&em_tree->lock);

L
Li Zefan 已提交
963 964 965 966 967 968 969 970 971 972 973 974
	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;
}
975

L
Li Zefan 已提交
976 977 978 979 980 981 982 983 984 985 986 987 988 989
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);
990 991 992
	return ret;
}

L
Li Zefan 已提交
993
static int should_defrag_range(struct inode *inode, u64 start, int thresh,
994 995
			       u64 *last_len, u64 *skip, u64 *defrag_end,
			       int compress)
996
{
L
Li Zefan 已提交
997
	struct extent_map *em;
998
	int ret = 1;
L
Li Zefan 已提交
999
	bool next_mergeable = true;
1000 1001

	/*
1002
	 * make sure that once we start defragging an extent, we keep on
1003 1004 1005 1006 1007 1008 1009
	 * defragging it
	 */
	if (start < *defrag_end)
		return 1;

	*skip = 0;

L
Li Zefan 已提交
1010 1011 1012
	em = defrag_lookup_extent(inode, start);
	if (!em)
		return 0;
1013 1014

	/* this will cover holes, and inline extents */
1015
	if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1016
		ret = 0;
1017 1018 1019
		goto out;
	}

L
Li Zefan 已提交
1020
	next_mergeable = defrag_check_next_extent(inode, em);
1021 1022

	/*
L
Li Zefan 已提交
1023 1024
	 * we hit a real extent, if it is big or the next extent is not a
	 * real extent, don't bother defragging it
1025
	 */
1026
	if (!compress && (*last_len == 0 || *last_len >= thresh) &&
L
Li Zefan 已提交
1027
	    (em->len >= thresh || !next_mergeable))
1028
		ret = 0;
1029
out:
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
	/*
	 * 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
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
/*
 * 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,
1065
				    unsigned long num_pages)
C
Christoph Hellwig 已提交
1066
{
C
Chris Mason 已提交
1067 1068 1069 1070
	unsigned long file_end;
	u64 isize = i_size_read(inode);
	u64 page_start;
	u64 page_end;
1071
	u64 page_cnt;
C
Chris Mason 已提交
1072 1073 1074
	int ret;
	int i;
	int i_done;
1075
	struct btrfs_ordered_extent *ordered;
C
Chris Mason 已提交
1076
	struct extent_state *cached_state = NULL;
1077
	struct extent_io_tree *tree;
1078
	gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
C
Chris Mason 已提交
1079 1080

	file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1081 1082 1083 1084
	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
1085 1086

	ret = btrfs_delalloc_reserve_space(inode,
1087
					   page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1088 1089 1090
	if (ret)
		return ret;
	i_done = 0;
1091
	tree = &BTRFS_I(inode)->io_tree;
C
Chris Mason 已提交
1092 1093

	/* step one, lock all the pages */
1094
	for (i = 0; i < page_cnt; i++) {
C
Chris Mason 已提交
1095
		struct page *page;
1096
again:
1097
		page = find_or_create_page(inode->i_mapping,
1098
					   start_index + i, mask);
C
Chris Mason 已提交
1099 1100 1101
		if (!page)
			break;

1102 1103 1104
		page_start = page_offset(page);
		page_end = page_start + PAGE_CACHE_SIZE - 1;
		while (1) {
1105
			lock_extent(tree, page_start, page_end);
1106 1107
			ordered = btrfs_lookup_ordered_extent(inode,
							      page_start);
1108
			unlock_extent(tree, page_start, page_end);
1109 1110 1111 1112 1113 1114 1115
			if (!ordered)
				break;

			unlock_page(page);
			btrfs_start_ordered_extent(inode, ordered, 1);
			btrfs_put_ordered_extent(ordered);
			lock_page(page);
1116 1117 1118 1119 1120 1121 1122 1123 1124
			/*
			 * 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;
			}
1125 1126
		}

C
Chris Mason 已提交
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
		if (!PageUptodate(page)) {
			btrfs_readpage(NULL, page);
			lock_page(page);
			if (!PageUptodate(page)) {
				unlock_page(page);
				page_cache_release(page);
				ret = -EIO;
				break;
			}
		}
1137 1138 1139 1140 1141 1142 1143

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

C
Chris Mason 已提交
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
		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,
1164
			 page_start, page_end - 1, 0, &cached_state);
C
Chris Mason 已提交
1165 1166
	clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
			  page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1167 1168
			  EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1169

1170
	if (i_done != page_cnt) {
1171 1172 1173
		spin_lock(&BTRFS_I(inode)->lock);
		BTRFS_I(inode)->outstanding_extents++;
		spin_unlock(&BTRFS_I(inode)->lock);
C
Chris Mason 已提交
1174
		btrfs_delalloc_release_space(inode,
1175
				     (page_cnt - i_done) << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1176 1177 1178
	}


1179 1180
	set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199

	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]);
	}
1200
	btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
	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
1211
	unsigned long last_index;
1212
	u64 isize = i_size_read(inode);
1213 1214 1215
	u64 last_len = 0;
	u64 skip = 0;
	u64 defrag_end = 0;
C
Chris Mason 已提交
1216
	u64 newer_off = range->start;
C
Christoph Hellwig 已提交
1217
	unsigned long i;
1218
	unsigned long ra_index = 0;
C
Christoph Hellwig 已提交
1219
	int ret;
C
Chris Mason 已提交
1220
	int defrag_count = 0;
1221
	int compress_type = BTRFS_COMPRESS_ZLIB;
C
Chris Mason 已提交
1222
	int extent_thresh = range->extent_thresh;
1223 1224
	unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
	unsigned long cluster = max_cluster;
C
Chris Mason 已提交
1225 1226 1227
	u64 new_align = ~((u64)128 * 1024 - 1);
	struct page **pages = NULL;

1228 1229 1230 1231 1232
	if (isize == 0)
		return 0;

	if (range->start >= isize)
		return -EINVAL;
1233 1234 1235 1236 1237 1238 1239

	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
1240

1241 1242
	if (extent_thresh == 0)
		extent_thresh = 256 * 1024;
1243

C
Chris Mason 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	/*
	 * 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;
	}

1257
	pages = kmalloc_array(max_cluster, sizeof(struct page *),
C
Chris Mason 已提交
1258 1259 1260 1261 1262 1263 1264
			GFP_NOFS);
	if (!pages) {
		ret = -ENOMEM;
		goto out_ra;
	}

	/* find the last page to defrag */
C
Chris Mason 已提交
1265
	if (range->start + range->len > range->start) {
1266
		last_index = min_t(u64, isize - 1,
C
Chris Mason 已提交
1267 1268
			 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
	} else {
1269
		last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
C
Chris Mason 已提交
1270 1271
	}

C
Chris Mason 已提交
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
	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
1288
		max_to_defrag = last_index + 1;
C
Chris Mason 已提交
1289

L
Li Zefan 已提交
1290 1291 1292 1293 1294 1295 1296
	/*
	 * 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;

1297 1298 1299
	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
1300 1301 1302 1303 1304 1305 1306
		/*
		 * make sure we stop running if someone unmounts
		 * the FS
		 */
		if (!(inode->i_sb->s_flags & MS_ACTIVE))
			break;

1307
		if (btrfs_defrag_cancelled(root->fs_info)) {
1308
			printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
1309 1310 1311 1312
			ret = -EAGAIN;
			break;
		}

1313
		if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
L
Li Zefan 已提交
1314
					 extent_thresh, &last_len, &skip,
1315 1316
					 &defrag_end, range->flags &
					 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1317 1318 1319 1320 1321 1322 1323 1324 1325
			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;
		}
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340

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

		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;
		}
1341

1342
		mutex_lock(&inode->i_mutex);
1343 1344
		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
			BTRFS_I(inode)->force_compress = compress_type;
1345
		ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1346 1347
		if (ret < 0) {
			mutex_unlock(&inode->i_mutex);
C
Chris Mason 已提交
1348
			goto out_ra;
1349
		}
C
Chris Mason 已提交
1350 1351

		defrag_count += ret;
1352
		balance_dirty_pages_ratelimited(inode->i_mapping);
1353
		mutex_unlock(&inode->i_mutex);
C
Chris Mason 已提交
1354 1355 1356 1357 1358

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

1359 1360 1361
			if (ret > 0)
				i += ret;

C
Chris Mason 已提交
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372
			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
1373
			}
C
Chris Mason 已提交
1374
		} else {
1375
			if (ret > 0) {
L
Li Zefan 已提交
1376
				i += ret;
1377 1378
				last_len += ret << PAGE_CACHE_SHIFT;
			} else {
L
Li Zefan 已提交
1379
				i++;
1380 1381
				last_len = 0;
			}
C
Christoph Hellwig 已提交
1382 1383 1384
		}
	}

C
Chris Mason 已提交
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402
	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);
	}

1403
	if (range->compress_type == BTRFS_COMPRESS_LZO) {
1404
		btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1405 1406
	}

1407
	ret = defrag_count;
1408

C
Chris Mason 已提交
1409
out_ra:
1410 1411 1412 1413 1414
	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
		mutex_lock(&inode->i_mutex);
		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
		mutex_unlock(&inode->i_mutex);
	}
C
Chris Mason 已提交
1415 1416 1417
	if (!file)
		kfree(ra);
	kfree(pages);
1418
	return ret;
C
Christoph Hellwig 已提交
1419 1420
}

1421
static noinline int btrfs_ioctl_resize(struct file *file,
1422
					void __user *arg)
C
Christoph Hellwig 已提交
1423 1424 1425 1426
{
	u64 new_size;
	u64 old_size;
	u64 devid = 1;
A
Al Viro 已提交
1427
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
1428 1429 1430 1431 1432 1433 1434 1435
	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;

1436 1437 1438
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

1439 1440 1441 1442
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

1443 1444
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
1445
		mnt_drop_write_file(file);
1446
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1447 1448
	}

1449
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
1450
	vol_args = memdup_user(arg, sizeof(*vol_args));
1451 1452 1453 1454
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
1455 1456

	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
1457 1458 1459 1460 1461 1462 1463 1464 1465

	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);
1466 1467 1468 1469
		if (!devid) {
			ret = -EINVAL;
			goto out_free;
		}
1470
		btrfs_info(root->fs_info, "resizing devid %llu", devid);
C
Christoph Hellwig 已提交
1471
	}
M
Miao Xie 已提交
1472

1473
	device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
C
Christoph Hellwig 已提交
1474
	if (!device) {
1475
		btrfs_info(root->fs_info, "resizer unable to find device %llu",
1476
		       devid);
1477
		ret = -ENODEV;
1478
		goto out_free;
C
Christoph Hellwig 已提交
1479
	}
M
Miao Xie 已提交
1480 1481

	if (!device->writeable) {
1482 1483
		btrfs_info(root->fs_info,
			   "resizer unable to apply on readonly device %llu",
1484
		       devid);
1485
		ret = -EPERM;
L
Liu Bo 已提交
1486 1487 1488
		goto out_free;
	}

C
Christoph Hellwig 已提交
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
	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
1499
		new_size = memparse(sizestr, NULL);
C
Christoph Hellwig 已提交
1500 1501
		if (new_size == 0) {
			ret = -EINVAL;
1502
			goto out_free;
C
Christoph Hellwig 已提交
1503 1504 1505
		}
	}

1506
	if (device->is_tgtdev_for_dev_replace) {
1507
		ret = -EPERM;
1508 1509 1510
		goto out_free;
	}

C
Christoph Hellwig 已提交
1511 1512 1513 1514 1515
	old_size = device->total_bytes;

	if (mod < 0) {
		if (new_size > old_size) {
			ret = -EINVAL;
1516
			goto out_free;
C
Christoph Hellwig 已提交
1517 1518 1519
		}
		new_size = old_size - new_size;
	} else if (mod > 0) {
1520 1521 1522 1523
		if (new_size > ULLONG_MAX - old_size) {
			ret = -EINVAL;
			goto out_free;
		}
C
Christoph Hellwig 已提交
1524 1525 1526 1527 1528
		new_size = old_size + new_size;
	}

	if (new_size < 256 * 1024 * 1024) {
		ret = -EINVAL;
1529
		goto out_free;
C
Christoph Hellwig 已提交
1530 1531 1532
	}
	if (new_size > device->bdev->bd_inode->i_size) {
		ret = -EFBIG;
1533
		goto out_free;
C
Christoph Hellwig 已提交
1534 1535 1536 1537 1538
	}

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

1539
	printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
1540
		      rcu_str_deref(device->name), new_size);
C
Christoph Hellwig 已提交
1541 1542

	if (new_size > old_size) {
1543
		trans = btrfs_start_transaction(root, 0);
1544 1545
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
1546
			goto out_free;
1547
		}
C
Christoph Hellwig 已提交
1548 1549
		ret = btrfs_grow_device(trans, device, new_size);
		btrfs_commit_transaction(trans, root);
1550
	} else if (new_size < old_size) {
C
Christoph Hellwig 已提交
1551
		ret = btrfs_shrink_device(device, new_size);
1552
	} /* equal, nothing need to do */
C
Christoph Hellwig 已提交
1553

1554
out_free:
C
Christoph Hellwig 已提交
1555
	kfree(vol_args);
1556 1557
out:
	mutex_unlock(&root->fs_info->volume_mutex);
1558
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1559
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1560 1561 1562
	return ret;
}

S
Sage Weil 已提交
1563
static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
A
Arne Jansen 已提交
1564 1565
				char *name, unsigned long fd, int subvol,
				u64 *transid, bool readonly,
1566
				struct btrfs_qgroup_inherit *inherit)
C
Christoph Hellwig 已提交
1567 1568
{
	int namelen;
1569
	int ret = 0;
C
Christoph Hellwig 已提交
1570

1571 1572 1573 1574
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;

S
Sage Weil 已提交
1575 1576
	namelen = strlen(name);
	if (strchr(name, '/')) {
C
Christoph Hellwig 已提交
1577
		ret = -EINVAL;
1578
		goto out_drop_write;
C
Christoph Hellwig 已提交
1579 1580
	}

1581 1582 1583
	if (name[0] == '.' &&
	   (namelen == 1 || (name[1] == '.' && namelen == 2))) {
		ret = -EEXIST;
1584
		goto out_drop_write;
1585 1586
	}

1587
	if (subvol) {
S
Sage Weil 已提交
1588
		ret = btrfs_mksubvol(&file->f_path, name, namelen,
A
Arne Jansen 已提交
1589
				     NULL, transid, readonly, inherit);
1590
	} else {
1591
		struct fd src = fdget(fd);
1592
		struct inode *src_inode;
1593
		if (!src.file) {
1594
			ret = -EINVAL;
1595
			goto out_drop_write;
1596 1597
		}

A
Al Viro 已提交
1598 1599
		src_inode = file_inode(src.file);
		if (src_inode->i_sb != file_inode(file)->i_sb) {
1600 1601
			btrfs_info(BTRFS_I(src_inode)->root->fs_info,
				   "Snapshot src from another FS");
1602
			ret = -EXDEV;
1603 1604 1605 1606 1607 1608
		} else if (!inode_owner_or_capable(src_inode)) {
			/*
			 * Subvolume creation is not restricted, but snapshots
			 * are limited to own subvolumes only
			 */
			ret = -EPERM;
1609 1610 1611 1612
		} else {
			ret = btrfs_mksubvol(&file->f_path, name, namelen,
					     BTRFS_I(src_inode)->root,
					     transid, readonly, inherit);
1613
		}
1614
		fdput(src);
1615
	}
1616 1617
out_drop_write:
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1618
out:
S
Sage Weil 已提交
1619 1620 1621 1622
	return ret;
}

static noinline int btrfs_ioctl_snap_create(struct file *file,
1623
					    void __user *arg, int subvol)
S
Sage Weil 已提交
1624
{
1625
	struct btrfs_ioctl_vol_args *vol_args;
S
Sage Weil 已提交
1626 1627
	int ret;

1628 1629 1630 1631
	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
1632

1633
	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
L
Li Zefan 已提交
1634
					      vol_args->fd, subvol,
A
Arne Jansen 已提交
1635
					      NULL, false, NULL);
1636

1637 1638 1639
	kfree(vol_args);
	return ret;
}
1640

1641 1642 1643 1644 1645 1646 1647
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
1648
	bool readonly = false;
A
Arne Jansen 已提交
1649
	struct btrfs_qgroup_inherit *inherit = NULL;
1650

1651 1652 1653 1654
	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';
1655

L
Li Zefan 已提交
1656
	if (vol_args->flags &
A
Arne Jansen 已提交
1657 1658
	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
	      BTRFS_SUBVOL_QGROUP_INHERIT)) {
L
Li Zefan 已提交
1659
		ret = -EOPNOTSUPP;
1660
		goto out;
S
Sage Weil 已提交
1661
	}
1662 1663 1664

	if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
		ptr = &transid;
L
Li Zefan 已提交
1665 1666
	if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
		readonly = true;
A
Arne Jansen 已提交
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
	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;
		}
	}
1678 1679

	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
A
Arne Jansen 已提交
1680
					      vol_args->fd, subvol, ptr,
1681
					      readonly, inherit);
1682 1683 1684 1685 1686 1687

	if (ret == 0 && ptr &&
	    copy_to_user(arg +
			 offsetof(struct btrfs_ioctl_vol_args_v2,
				  transid), ptr, sizeof(*ptr)))
		ret = -EFAULT;
1688
out:
C
Christoph Hellwig 已提交
1689
	kfree(vol_args);
A
Arne Jansen 已提交
1690
	kfree(inherit);
C
Christoph Hellwig 已提交
1691 1692 1693
	return ret;
}

1694 1695 1696
static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
						void __user *arg)
{
A
Al Viro 已提交
1697
	struct inode *inode = file_inode(file);
1698 1699 1700 1701
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret = 0;
	u64 flags = 0;

L
Li Zefan 已提交
1702
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
		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)
{
A
Al Viro 已提交
1719
	struct inode *inode = file_inode(file);
1720 1721 1722 1723 1724 1725
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	u64 root_flags;
	u64 flags;
	int ret = 0;

1726 1727 1728
	if (!inode_owner_or_capable(inode))
		return -EPERM;

1729 1730 1731
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;
1732

1733 1734 1735 1736
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1737

1738 1739 1740 1741
	if (copy_from_user(&flags, arg, sizeof(flags))) {
		ret = -EFAULT;
		goto out_drop_write;
	}
1742

1743 1744 1745 1746
	if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1747

1748 1749 1750 1751
	if (flags & ~BTRFS_SUBVOL_RDONLY) {
		ret = -EOPNOTSUPP;
		goto out_drop_write;
	}
1752 1753 1754 1755 1756

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

	/* nothing to do */
	if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1757
		goto out_drop_sem;
1758 1759

	root_flags = btrfs_root_flags(&root->root_item);
1760
	if (flags & BTRFS_SUBVOL_RDONLY) {
1761 1762
		btrfs_set_root_flags(&root->root_item,
				     root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1763 1764 1765 1766 1767 1768 1769 1770
	} else {
		/*
		 * Block RO -> RW transition if this subvolume is involved in
		 * send
		 */
		spin_lock(&root->root_item_lock);
		if (root->send_in_progress == 0) {
			btrfs_set_root_flags(&root->root_item,
1771
				     root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
			spin_unlock(&root->root_item_lock);
		} else {
			spin_unlock(&root->root_item_lock);
			btrfs_warn(root->fs_info,
			"Attempt to set subvolume %llu read-write during send",
					root->root_key.objectid);
			ret = -EPERM;
			goto out_drop_sem;
		}
	}
1782 1783 1784 1785 1786 1787 1788

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

1789
	ret = btrfs_update_root(trans, root->fs_info->tree_root,
1790 1791 1792 1793 1794 1795
				&root->root_key, &root->root_item);

	btrfs_commit_transaction(trans, root);
out_reset:
	if (ret)
		btrfs_set_root_flags(&root->root_item, root_flags);
1796
out_drop_sem:
1797
	up_write(&root->fs_info->subvol_sem);
1798 1799 1800
out_drop_write:
	mnt_drop_write_file(file);
out:
1801 1802 1803
	return ret;
}

1804 1805 1806 1807 1808 1809
/*
 * helper to check if the subvolume references other subvolumes
 */
static noinline int may_destroy_subvol(struct btrfs_root *root)
{
	struct btrfs_path *path;
1810
	struct btrfs_dir_item *di;
1811
	struct btrfs_key key;
1812
	u64 dir_id;
1813 1814 1815 1816 1817 1818
	int ret;

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

1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
	/* Make sure this root isn't set as the default subvol */
	dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
	di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
				   dir_id, "default", 7, 0);
	if (di && !IS_ERR(di)) {
		btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
		if (key.objectid == root->root_key.objectid) {
			ret = -ENOTEMPTY;
			goto out;
		}
		btrfs_release_path(path);
	}

1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
	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;
}

1855 1856 1857
static noinline int key_in_sk(struct btrfs_key *key,
			      struct btrfs_ioctl_search_key *sk)
{
1858 1859 1860 1861 1862 1863 1864 1865 1866
	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)
1867
		return 0;
1868 1869 1870 1871 1872 1873 1874

	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)
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
		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);

1911 1912 1913 1914 1915
		btrfs_item_key_to_cpu(leaf, key, i);
		if (!key_in_sk(key, sk))
			continue;

		if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940
			item_len = 0;

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

		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;
		}
1941
		(*num_found)++;
1942 1943 1944 1945 1946

		if (*num_found >= sk->nr_items)
			break;
	}
advance_key:
1947 1948
	ret = 0;
	if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1949
		key->offset++;
1950 1951
	else if (key->type < (u8)-1 && key->type < sk->max_type) {
		key->offset = 0;
1952
		key->type++;
1953 1954 1955
	} else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
		key->offset = 0;
		key->type = 0;
1956
		key->objectid++;
1957 1958
	} else
		ret = 1;
1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
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_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)) {
1988
			printk(KERN_ERR "BTRFS: could not find root %llu\n",
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
			       sk->tree_id);
			btrfs_free_path(path);
			return -ENOENT;
		}
	}

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

	path->keep_locks = 1;

2001
	while (1) {
2002
		ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2003 2004 2005 2006 2007 2008 2009
		if (ret != 0) {
			if (ret > 0)
				ret = 0;
			goto err;
		}
		ret = copy_to_sk(root, path, &key, sk, args->buf,
				 &sk_offset, &num_found);
2010
		btrfs_release_path(path);
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
		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
2032 2033 2034
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
2035

A
Al Viro 已提交
2036
	inode = file_inode(file);
2037 2038 2039 2040 2041 2042 2043
	ret = search_ioctl(inode, args);
	if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
		ret = -EFAULT;
	kfree(args);
	return ret;
}

2044
/*
2045 2046 2047
 * Search INODE_REFs to identify path name of 'dirid' directory
 * in a 'tree_id' tree. and sets path name to 'name'.
 */
2048 2049 2050 2051 2052
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;
2053
	char *ptr;
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
	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;

2071
	ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2072 2073 2074 2075 2076 2077

	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)) {
2078
		printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
2079 2080
		ret = -ENOENT;
		goto out;
2081 2082 2083 2084
	}

	key.objectid = dirid;
	key.type = BTRFS_INODE_REF_KEY;
2085
	key.offset = (u64)-1;
2086

2087
	while (1) {
2088 2089 2090
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		if (ret < 0)
			goto out;
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
		else if (ret > 0) {
			ret = btrfs_previous_item(root, path, dirid,
						  BTRFS_INODE_REF_KEY);
			if (ret < 0)
				goto out;
			else if (ret > 0) {
				ret = -ENOENT;
				goto out;
			}
		}
2101 2102 2103 2104 2105 2106 2107 2108 2109

		l = path->nodes[0];
		slot = path->slots[0];
		btrfs_item_key_to_cpu(l, &key, slot);

		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;
2110 2111
		if (ptr < name) {
			ret = -ENAMETOOLONG;
2112
			goto out;
2113
		}
2114 2115

		*(ptr + len) = '/';
2116
		read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2117 2118 2119 2120

		if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
			break;

2121
		btrfs_release_path(path);
2122
		key.objectid = key.offset;
2123
		key.offset = (u64)-1;
2124 2125
		dirid = key.objectid;
	}
2126
	memmove(name, ptr, total_len);
2127
	name[total_len] = '\0';
2128 2129 2130
	ret = 0;
out:
	btrfs_free_path(path);
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
	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
2144 2145 2146
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
2147

A
Al Viro 已提交
2148
	inode = file_inode(file);
2149

2150 2151 2152
	if (args->treeid == 0)
		args->treeid = BTRFS_I(inode)->root->root_key.objectid;

2153 2154 2155 2156 2157 2158 2159 2160
	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);
2161 2162 2163
	return ret;
}

2164 2165 2166
static noinline int btrfs_ioctl_snap_destroy(struct file *file,
					     void __user *arg)
{
A
Al Viro 已提交
2167
	struct dentry *parent = file->f_path.dentry;
2168 2169 2170 2171 2172 2173 2174
	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;
2175 2176
	struct btrfs_block_rsv block_rsv;
	u64 qgroup_reserved;
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
	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;
	}

2193
	err = mnt_want_write_file(file);
2194 2195 2196
	if (err)
		goto out;

2197 2198
	err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (err == -EINTR)
2199
		goto out_drop_write;
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211
	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;
2212
	dest = BTRFS_I(inode)->root;
2213
	if (!capable(CAP_SYS_ADMIN)) {
2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
		/*
		 * 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;
	}

2247 2248 2249 2250 2251
	/* check if subvolume may be deleted by a user */
	err = btrfs_may_delete(dir, dentry, 1);
	if (err)
		goto out_dput;

L
Li Zefan 已提交
2252
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267
		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;

2268 2269 2270 2271 2272 2273
	btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
	/*
	 * One for dir inode, two for dir entries, two for root
	 * ref/backref.
	 */
	err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2274
					       5, &qgroup_reserved, true);
2275 2276 2277
	if (err)
		goto out_up_write;

2278 2279 2280
	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
2281
		goto out_release;
2282
	}
2283 2284
	trans->block_rsv = &block_rsv;
	trans->bytes_reserved = block_rsv.size;
2285

2286 2287 2288 2289
	ret = btrfs_unlink_subvol(trans, root, dir,
				dest->root_key.objectid,
				dentry->d_name.name,
				dentry->d_name.len);
2290 2291 2292 2293 2294
	if (ret) {
		err = ret;
		btrfs_abort_transaction(trans, root, ret);
		goto out_end_trans;
	}
2295 2296 2297 2298 2299 2300 2301 2302

	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);

2303 2304 2305 2306
	if (!xchg(&dest->orphan_item_inserted, 1)) {
		ret = btrfs_insert_orphan_item(trans,
					root->fs_info->tree_root,
					dest->root_key.objectid);
2307 2308 2309 2310 2311
		if (ret) {
			btrfs_abort_transaction(trans, root, ret);
			err = ret;
			goto out_end_trans;
		}
2312
	}
2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333

	ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
				  dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
				  dest->root_key.objectid);
	if (ret && ret != -ENOENT) {
		btrfs_abort_transaction(trans, root, ret);
		err = ret;
		goto out_end_trans;
	}
	if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
		ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
					  dest->root_item.received_uuid,
					  BTRFS_UUID_KEY_RECEIVED_SUBVOL,
					  dest->root_key.objectid);
		if (ret && ret != -ENOENT) {
			btrfs_abort_transaction(trans, root, ret);
			err = ret;
			goto out_end_trans;
		}
	}

2334
out_end_trans:
2335 2336
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
S
Sage Weil 已提交
2337
	ret = btrfs_end_transaction(trans, root);
2338 2339
	if (ret && !err)
		err = ret;
2340
	inode->i_flags |= S_DEAD;
2341 2342
out_release:
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2343 2344 2345 2346 2347
out_up_write:
	up_write(&root->fs_info->subvol_sem);
out_unlock:
	mutex_unlock(&inode->i_mutex);
	if (!err) {
2348
		shrink_dcache_sb(root->fs_info->sb);
2349 2350
		btrfs_invalidate_inodes(dest);
		d_delete(dentry);
2351 2352 2353 2354 2355 2356

		/* the last ref */
		if (dest->cache_inode) {
			iput(dest->cache_inode);
			dest->cache_inode = NULL;
		}
2357 2358 2359 2360 2361
	}
out_dput:
	dput(dentry);
out_unlock_dir:
	mutex_unlock(&dir->i_mutex);
2362
out_drop_write:
A
Al Viro 已提交
2363
	mnt_drop_write_file(file);
2364 2365 2366 2367 2368
out:
	kfree(vol_args);
	return err;
}

C
Chris Mason 已提交
2369
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
C
Christoph Hellwig 已提交
2370
{
A
Al Viro 已提交
2371
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
2372
	struct btrfs_root *root = BTRFS_I(inode)->root;
C
Chris Mason 已提交
2373
	struct btrfs_ioctl_defrag_range_args *range;
Y
Yan Zheng 已提交
2374 2375
	int ret;

2376 2377 2378
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
L
Li Zefan 已提交
2379

2380 2381 2382
	if (btrfs_root_readonly(root)) {
		ret = -EROFS;
		goto out;
2383
	}
C
Christoph Hellwig 已提交
2384 2385 2386

	switch (inode->i_mode & S_IFMT) {
	case S_IFDIR:
2387 2388 2389 2390
		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto out;
		}
2391
		ret = btrfs_defrag_root(root);
2392 2393
		if (ret)
			goto out;
2394
		ret = btrfs_defrag_root(root->fs_info->extent_root);
C
Christoph Hellwig 已提交
2395 2396
		break;
	case S_IFREG:
2397 2398 2399 2400
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			goto out;
		}
C
Chris Mason 已提交
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412

		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);
2413
				goto out;
C
Chris Mason 已提交
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423
			}
			/* 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;
		}
A
Al Viro 已提交
2424
		ret = btrfs_defrag_file(file_inode(file), file,
C
Chris Mason 已提交
2425 2426 2427
					range, 0, 0);
		if (ret > 0)
			ret = 0;
C
Chris Mason 已提交
2428
		kfree(range);
C
Christoph Hellwig 已提交
2429
		break;
2430 2431
	default:
		ret = -EINVAL;
C
Christoph Hellwig 已提交
2432
	}
2433
out:
2434
	mnt_drop_write_file(file);
2435
	return ret;
C
Christoph Hellwig 已提交
2436 2437
}

2438
static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
C
Christoph Hellwig 已提交
2439 2440 2441 2442
{
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2443 2444 2445
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2446 2447
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
2448
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2449 2450
	}

2451
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
2452
	vol_args = memdup_user(arg, sizeof(*vol_args));
2453 2454 2455 2456
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2457

2458
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2459 2460 2461
	ret = btrfs_init_new_device(root, vol_args->name);

	kfree(vol_args);
2462 2463
out:
	mutex_unlock(&root->fs_info->volume_mutex);
2464
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
C
Christoph Hellwig 已提交
2465 2466 2467
	return ret;
}

2468
static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
C
Christoph Hellwig 已提交
2469
{
A
Al Viro 已提交
2470
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
2471 2472 2473
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2474 2475 2476
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2477 2478 2479
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
Y
Yan Zheng 已提交
2480

L
Li Zefan 已提交
2481
	vol_args = memdup_user(arg, sizeof(*vol_args));
2482 2483 2484 2485
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2486

2487
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2488

2489 2490 2491 2492 2493 2494 2495 2496
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
		ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
		goto out;
	}

	mutex_lock(&root->fs_info->volume_mutex);
	ret = btrfs_rm_device(root, vol_args->name);
2497
	mutex_unlock(&root->fs_info->volume_mutex);
2498
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2499 2500 2501

out:
	kfree(vol_args);
2502
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
2503 2504 2505
	return ret;
}

J
Jan Schmidt 已提交
2506 2507
static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
{
2508
	struct btrfs_ioctl_fs_info_args *fi_args;
J
Jan Schmidt 已提交
2509 2510 2511
	struct btrfs_device *device;
	struct btrfs_device *next;
	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2512
	int ret = 0;
J
Jan Schmidt 已提交
2513 2514 2515 2516

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

2517 2518 2519 2520
	fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
	if (!fi_args)
		return -ENOMEM;

2521
	mutex_lock(&fs_devices->device_list_mutex);
2522 2523
	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
2524 2525

	list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2526 2527
		if (device->devid > fi_args->max_id)
			fi_args->max_id = device->devid;
J
Jan Schmidt 已提交
2528 2529 2530
	}
	mutex_unlock(&fs_devices->device_list_mutex);

2531 2532
	if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
		ret = -EFAULT;
J
Jan Schmidt 已提交
2533

2534 2535
	kfree(fi_args);
	return ret;
J
Jan Schmidt 已提交
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
}

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;

	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);

2553
	if (!btrfs_is_empty_uuid(di_args->uuid))
J
Jan Schmidt 已提交
2554 2555 2556
		s_uuid = di_args->uuid;

	mutex_lock(&fs_devices->device_list_mutex);
2557
	dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
J
Jan Schmidt 已提交
2558 2559 2560 2561 2562 2563 2564 2565 2566 2567

	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));
2568
	if (dev->name) {
2569 2570 2571 2572 2573 2574
		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();
2575 2576
		di_args->path[sizeof(di_args->path) - 1] = 0;
	} else {
2577
		di_args->path[0] = '\0';
2578
	}
J
Jan Schmidt 已提交
2579 2580

out:
2581
	mutex_unlock(&fs_devices->device_list_mutex);
J
Jan Schmidt 已提交
2582 2583 2584 2585 2586 2587 2588
	if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
		ret = -EFAULT;

	kfree(di_args);
	return ret;
}

M
Mark Fasheh 已提交
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
static struct page *extent_same_get_page(struct inode *inode, u64 off)
{
	struct page *page;
	pgoff_t index;
	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;

	index = off >> PAGE_CACHE_SHIFT;

	page = grab_cache_page(inode->i_mapping, index);
	if (!page)
		return NULL;

	if (!PageUptodate(page)) {
		if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
						 0))
			return NULL;
		lock_page(page);
		if (!PageUptodate(page)) {
			unlock_page(page);
			page_cache_release(page);
			return NULL;
		}
	}
	unlock_page(page);

	return page;
}

2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636
static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
{
	/* do any pending delalloc/csum calc on src, one way or
	   another, and lock file content */
	while (1) {
		struct btrfs_ordered_extent *ordered;
		lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
		ordered = btrfs_lookup_first_ordered_extent(inode,
							    off + len - 1);
		if (!ordered &&
		    !test_range_bit(&BTRFS_I(inode)->io_tree, off,
				    off + len - 1, EXTENT_DELALLOC, 0, NULL))
			break;
		unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
		if (ordered)
			btrfs_put_ordered_extent(ordered);
		btrfs_wait_ordered_range(inode, off, len);
	}
}

M
Mark Fasheh 已提交
2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
				struct inode *inode2, u64 loff2, u64 len)
{
	unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
	unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);

	mutex_unlock(&inode1->i_mutex);
	mutex_unlock(&inode2->i_mutex);
}

static void btrfs_double_lock(struct inode *inode1, u64 loff1,
			      struct inode *inode2, u64 loff2, u64 len)
{
	if (inode1 < inode2) {
		swap(inode1, inode2);
		swap(loff1, loff2);
	}

	mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
	lock_extent_range(inode1, loff1, len);
	if (inode1 != inode2) {
		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
		lock_extent_range(inode2, loff2, len);
	}
}

static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
			  u64 dst_loff, u64 len)
{
	int ret = 0;
	struct page *src_page, *dst_page;
	unsigned int cmp_len = PAGE_CACHE_SIZE;
	void *addr, *dst_addr;

	while (len) {
		if (len < PAGE_CACHE_SIZE)
			cmp_len = len;

		src_page = extent_same_get_page(src, loff);
		if (!src_page)
			return -EINVAL;
		dst_page = extent_same_get_page(dst, dst_loff);
		if (!dst_page) {
			page_cache_release(src_page);
			return -EINVAL;
		}
		addr = kmap_atomic(src_page);
		dst_addr = kmap_atomic(dst_page);

		flush_dcache_page(src_page);
		flush_dcache_page(dst_page);

		if (memcmp(addr, dst_addr, cmp_len))
			ret = BTRFS_SAME_DATA_DIFFERS;

		kunmap_atomic(addr);
		kunmap_atomic(dst_addr);
		page_cache_release(src_page);
		page_cache_release(dst_page);

		if (ret)
			break;

		loff += cmp_len;
		dst_loff += cmp_len;
		len -= cmp_len;
	}

	return ret;
}

static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
{
	u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;

	if (off + len > inode->i_size || off + len < off)
		return -EINVAL;
	/* Check that we are block aligned - btrfs_clone() requires this */
	if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
		return -EINVAL;

	return 0;
}

static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
			     struct inode *dst, u64 dst_loff)
{
	int ret;

	/*
	 * btrfs_clone() can't handle extents in the same file
	 * yet. Once that works, we can drop this check and replace it
	 * with a check for the same inode, but overlapping extents.
	 */
	if (src == dst)
		return -EINVAL;

	btrfs_double_lock(src, loff, dst, dst_loff, len);

	ret = extent_same_check_offsets(src, loff, len);
	if (ret)
		goto out_unlock;

	ret = extent_same_check_offsets(dst, dst_loff, len);
	if (ret)
		goto out_unlock;

	/* don't make the dst file partly checksummed */
	if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
	    (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
		ret = -EINVAL;
		goto out_unlock;
	}

	ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
	if (ret == 0)
		ret = btrfs_clone(src, dst, loff, len, len, dst_loff);

out_unlock:
	btrfs_double_unlock(src, loff, dst, dst_loff, len);

	return ret;
}

#define BTRFS_MAX_DEDUPE_LEN	(16 * 1024 * 1024)

static long btrfs_ioctl_file_extent_same(struct file *file,
					 void __user *argp)
{
2766 2767 2768
	struct btrfs_ioctl_same_args tmp;
	struct btrfs_ioctl_same_args *same;
	struct btrfs_ioctl_same_extent_info *info;
M
Mark Fasheh 已提交
2769 2770 2771 2772 2773 2774 2775
	struct inode *src = file->f_dentry->d_inode;
	struct file *dst_file = NULL;
	struct inode *dst;
	u64 off;
	u64 len;
	int i;
	int ret;
2776
	unsigned long size;
M
Mark Fasheh 已提交
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786
	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
	bool is_admin = capable(CAP_SYS_ADMIN);

	if (!(file->f_mode & FMODE_READ))
		return -EINVAL;

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

2787
	if (copy_from_user(&tmp,
M
Mark Fasheh 已提交
2788
			   (struct btrfs_ioctl_same_args __user *)argp,
2789
			   sizeof(tmp))) {
M
Mark Fasheh 已提交
2790 2791 2792 2793
		ret = -EFAULT;
		goto out;
	}

2794 2795 2796
	size = sizeof(tmp) +
		tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);

2797
	same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
2798

2799 2800
	if (IS_ERR(same)) {
		ret = PTR_ERR(same);
2801 2802 2803 2804 2805
		goto out;
	}

	off = same->logical_offset;
	len = same->length;
M
Mark Fasheh 已提交
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832

	/*
	 * Limit the total length we will dedupe for each operation.
	 * This is intended to bound the total time spent in this
	 * ioctl to something sane.
	 */
	if (len > BTRFS_MAX_DEDUPE_LEN)
		len = BTRFS_MAX_DEDUPE_LEN;

	if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
		/*
		 * Btrfs does not support blocksize < page_size. As a
		 * result, btrfs_cmp_data() won't correctly handle
		 * this situation without an update.
		 */
		ret = -EINVAL;
		goto out;
	}

	ret = -EISDIR;
	if (S_ISDIR(src->i_mode))
		goto out;

	ret = -EACCES;
	if (!S_ISREG(src->i_mode))
		goto out;

2833 2834 2835 2836 2837
	/* pre-format output fields to sane values */
	for (i = 0; i < same->dest_count; i++) {
		same->info[i].bytes_deduped = 0ULL;
		same->info[i].status = 0;
	}
M
Mark Fasheh 已提交
2838

2839 2840 2841
	ret = 0;
	for (i = 0; i < same->dest_count; i++) {
		info = &same->info[i];
M
Mark Fasheh 已提交
2842

2843
		dst_file = fget(info->fd);
M
Mark Fasheh 已提交
2844
		if (!dst_file) {
2845
			info->status = -EBADF;
M
Mark Fasheh 已提交
2846 2847 2848 2849
			goto next;
		}

		if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
2850
			info->status = -EINVAL;
M
Mark Fasheh 已提交
2851 2852 2853
			goto next;
		}

2854
		info->status = -EXDEV;
M
Mark Fasheh 已提交
2855 2856 2857 2858 2859 2860 2861 2862
		if (file->f_path.mnt != dst_file->f_path.mnt)
			goto next;

		dst = dst_file->f_dentry->d_inode;
		if (src->i_sb != dst->i_sb)
			goto next;

		if (S_ISDIR(dst->i_mode)) {
2863
			info->status = -EISDIR;
M
Mark Fasheh 已提交
2864 2865 2866 2867
			goto next;
		}

		if (!S_ISREG(dst->i_mode)) {
2868
			info->status = -EACCES;
M
Mark Fasheh 已提交
2869 2870 2871
			goto next;
		}

2872 2873 2874 2875
		info->status = btrfs_extent_same(src, off, len, dst,
						info->logical_offset);
		if (info->status == 0)
			info->bytes_deduped += len;
M
Mark Fasheh 已提交
2876 2877 2878 2879 2880 2881

next:
		if (dst_file)
			fput(dst_file);
	}

2882 2883 2884 2885
	ret = copy_to_user(argp, same, size);
	if (ret)
		ret = -EFAULT;

M
Mark Fasheh 已提交
2886 2887 2888 2889 2890
out:
	mnt_drop_write_file(file);
	return ret;
}

2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903
/**
 * btrfs_clone() - clone a range from inode file to another
 *
 * @src: Inode to clone from
 * @inode: Inode to clone to
 * @off: Offset within source to start clone from
 * @olen: Original length, passed by user, of range to clone
 * @olen_aligned: Block-aligned value of olen, extent_same uses
 *               identical values here
 * @destoff: Offset within @inode to start clone
 */
static int btrfs_clone(struct inode *src, struct inode *inode,
		       u64 off, u64 olen, u64 olen_aligned, u64 destoff)
C
Christoph Hellwig 已提交
2904 2905
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
2906
	struct btrfs_path *path = NULL;
C
Christoph Hellwig 已提交
2907
	struct extent_buffer *leaf;
2908 2909
	struct btrfs_trans_handle *trans;
	char *buf = NULL;
Y
Yan Zheng 已提交
2910
	struct btrfs_key key;
C
Christoph Hellwig 已提交
2911 2912
	u32 nritems;
	int slot;
Y
Yan Zheng 已提交
2913
	int ret;
2914
	u64 len = olen_aligned;
Y
Yan Zheng 已提交
2915 2916 2917 2918

	ret = -ENOMEM;
	buf = vmalloc(btrfs_level_size(root, 0));
	if (!buf)
2919
		return ret;
Y
Yan Zheng 已提交
2920 2921 2922 2923

	path = btrfs_alloc_path();
	if (!path) {
		vfree(buf);
2924
		return ret;
2925 2926
	}

2927
	path->reada = 2;
2928
	/* clone data */
L
Li Zefan 已提交
2929
	key.objectid = btrfs_ino(src);
Y
Yan Zheng 已提交
2930 2931
	key.type = BTRFS_EXTENT_DATA_KEY;
	key.offset = 0;
C
Christoph Hellwig 已提交
2932 2933 2934 2935 2936 2937

	while (1) {
		/*
		 * note the key will change type as we walk through the
		 * tree.
		 */
2938
		path->leave_spinning = 1;
2939 2940
		ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
				0, 0);
C
Christoph Hellwig 已提交
2941 2942 2943
		if (ret < 0)
			goto out;

Y
Yan Zheng 已提交
2944
		nritems = btrfs_header_nritems(path->nodes[0]);
2945
process_slot:
Y
Yan Zheng 已提交
2946
		if (path->slots[0] >= nritems) {
2947
			ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
C
Christoph Hellwig 已提交
2948 2949 2950 2951
			if (ret < 0)
				goto out;
			if (ret > 0)
				break;
Y
Yan Zheng 已提交
2952
			nritems = btrfs_header_nritems(path->nodes[0]);
C
Christoph Hellwig 已提交
2953 2954 2955 2956
		}
		leaf = path->nodes[0];
		slot = path->slots[0];

Y
Yan Zheng 已提交
2957
		btrfs_item_key_to_cpu(leaf, &key, slot);
2958
		if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
L
Li Zefan 已提交
2959
		    key.objectid != btrfs_ino(src))
C
Christoph Hellwig 已提交
2960 2961
			break;

2962 2963 2964
		if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
			struct btrfs_file_extent_item *extent;
			int type;
Z
Zheng Yan 已提交
2965 2966
			u32 size;
			struct btrfs_key new_key;
2967 2968 2969
			u64 disko = 0, diskl = 0;
			u64 datao = 0, datal = 0;
			u8 comp;
2970
			u64 endoff;
Z
Zheng Yan 已提交
2971

2972 2973 2974 2975
			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);
2976 2977
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
C
Chris Mason 已提交
2978 2979 2980 2981
				disko = btrfs_file_extent_disk_bytenr(leaf,
								      extent);
				diskl = btrfs_file_extent_disk_num_bytes(leaf,
								 extent);
2982
				datao = btrfs_file_extent_offset(leaf, extent);
C
Chris Mason 已提交
2983 2984
				datal = btrfs_file_extent_num_bytes(leaf,
								    extent);
2985 2986 2987 2988 2989
			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
				/* take upper bound, may be compressed */
				datal = btrfs_file_extent_ram_bytes(leaf,
								    extent);
			}
Z
Zheng Yan 已提交
2990

2991
			if (key.offset + datal <= off ||
2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003
			    key.offset >= off + len - 1) {
				path->slots[0]++;
				goto process_slot;
			}

			size = btrfs_item_size_nr(leaf, slot);
			read_extent_buffer(leaf, buf,
					   btrfs_item_ptr_offset(leaf, slot),
					   size);

			btrfs_release_path(path);
			path->leave_spinning = 0;
3004

Z
Zheng Yan 已提交
3005
			memcpy(&new_key, &key, sizeof(new_key));
L
Li Zefan 已提交
3006
			new_key.objectid = btrfs_ino(inode);
3007 3008 3009 3010
			if (off <= key.offset)
				new_key.offset = key.offset + destoff - off;
			else
				new_key.offset = destoff;
Z
Zheng Yan 已提交
3011

3012 3013 3014 3015 3016 3017
			/*
			 * 1 - adjusting old extent (we may have to split it)
			 * 1 - add new extent
			 * 1 - inode update
			 */
			trans = btrfs_start_transaction(root, 3);
3018 3019 3020 3021 3022
			if (IS_ERR(trans)) {
				ret = PTR_ERR(trans);
				goto out;
			}

3023 3024
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
3025 3026 3027 3028 3029 3030 3031 3032 3033 3034
				/*
				 *    a  | --- range to clone ---|  b
				 * | ------------- extent ------------- |
				 */

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

				/* substract range a */
3035 3036 3037 3038 3039
				if (off > key.offset) {
					datao += off - key.offset;
					datal -= off - key.offset;
				}

J
Josef Bacik 已提交
3040
				ret = btrfs_drop_extents(trans, root, inode,
3041 3042
							 new_key.offset,
							 new_key.offset + datal,
3043
							 1);
3044 3045 3046 3047 3048 3049
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3050

3051 3052
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
3053 3054 3055 3056 3057 3058
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3059 3060 3061 3062

				leaf = path->nodes[0];
				slot = path->slots[0];
				write_extent_buffer(leaf, buf,
Z
Zheng Yan 已提交
3063 3064
					    btrfs_item_ptr_offset(leaf, slot),
					    size);
Y
Yan Zheng 已提交
3065

3066
				extent = btrfs_item_ptr(leaf, slot,
C
Christoph Hellwig 已提交
3067
						struct btrfs_file_extent_item);
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078

				/* 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
3079
					ret = btrfs_inc_extent_ref(trans, root,
3080 3081
							disko, diskl, 0,
							root->root_key.objectid,
L
Li Zefan 已提交
3082
							btrfs_ino(inode),
A
Arne Jansen 已提交
3083 3084
							new_key.offset - datao,
							0);
3085 3086 3087 3088 3089 3090 3091 3092 3093
					if (ret) {
						btrfs_abort_transaction(trans,
									root,
									ret);
						btrfs_end_transaction(trans,
								      root);
						goto out;

					}
C
Christoph Hellwig 已提交
3094
				}
3095 3096 3097 3098 3099 3100 3101
			} 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
3102

L
Liu Bo 已提交
3103 3104
				if (key.offset + datal > off + len)
					trim = key.offset + datal - (off + len);
C
Chris Mason 已提交
3105

3106 3107
				if (comp && (skip || trim)) {
					ret = -EINVAL;
3108
					btrfs_end_transaction(trans, root);
3109 3110 3111 3112
					goto out;
				}
				size -= skip + trim;
				datal -= skip + trim;
3113

J
Josef Bacik 已提交
3114
				ret = btrfs_drop_extents(trans, root, inode,
3115 3116
							 new_key.offset,
							 new_key.offset + datal,
3117
							 1);
3118 3119 3120 3121 3122 3123
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3124

3125 3126
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
3127 3128 3129 3130 3131 3132
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3133 3134

				if (skip) {
C
Chris Mason 已提交
3135 3136
					u32 start =
					  btrfs_file_extent_calc_inline_size(0);
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146
					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
3147
			}
3148 3149

			btrfs_mark_buffer_dirty(leaf);
3150
			btrfs_release_path(path);
3151

3152
			inode_inc_iversion(inode);
3153
			inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3154 3155 3156 3157 3158 3159 3160

			/*
			 * 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;
3161 3162
			if (endoff > destoff+olen)
				endoff = destoff+olen;
3163 3164 3165
			if (endoff > inode->i_size)
				btrfs_i_size_write(inode, endoff);

3166
			ret = btrfs_update_inode(trans, root, inode);
3167 3168 3169 3170 3171 3172
			if (ret) {
				btrfs_abort_transaction(trans, root, ret);
				btrfs_end_transaction(trans, root);
				goto out;
			}
			ret = btrfs_end_transaction(trans, root);
3173
		}
3174
		btrfs_release_path(path);
C
Christoph Hellwig 已提交
3175 3176 3177
		key.offset++;
	}
	ret = 0;
3178

C
Christoph Hellwig 已提交
3179
out:
3180
	btrfs_release_path(path);
3181 3182 3183 3184 3185 3186 3187 3188
	btrfs_free_path(path);
	vfree(buf);
	return ret;
}

static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
				       u64 off, u64 olen, u64 destoff)
{
A
Al Viro 已提交
3189
	struct inode *inode = file_inode(file);
3190 3191 3192 3193 3194 3195 3196 3197 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 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct fd src_file;
	struct inode *src;
	int ret;
	u64 len = olen;
	u64 bs = root->fs_info->sb->s_blocksize;
	int same_inode = 0;

	/*
	 * 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)?
	 */

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

	if (btrfs_root_readonly(root))
		return -EROFS;

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

	src_file = fdget(srcfd);
	if (!src_file.file) {
		ret = -EBADF;
		goto out_drop_write;
	}

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

	src = file_inode(src_file.file);

	ret = -EINVAL;
	if (src == inode)
		same_inode = 1;

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

	/* 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;

	ret = -EISDIR;
	if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
		goto out_fput;

	ret = -EXDEV;
	if (src->i_sb != inode->i_sb)
		goto out_fput;

	if (!same_inode) {
		if (inode < src) {
			mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
			mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
		} else {
			mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
			mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
		}
	} else {
		mutex_lock(&src->i_mutex);
	}

	/* determine range to clone */
	ret = -EINVAL;
	if (off + len > src->i_size || off + len < off)
		goto out_unlock;
	if (len == 0)
		olen = len = src->i_size - off;
	/* if we extend to eof, continue to block boundary */
	if (off + len == src->i_size)
		len = ALIGN(src->i_size, bs) - off;

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

	/* verify if ranges are overlapped within the same file */
	if (same_inode) {
		if (destoff + len > off && destoff < off + len)
			goto out_unlock;
	}

	if (destoff > inode->i_size) {
		ret = btrfs_cont_expand(inode, inode->i_size, destoff);
		if (ret)
			goto out_unlock;
	}

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

	lock_extent_range(src, off, len);

	ret = btrfs_clone(src, inode, off, olen, len, destoff);

L
Liu Bo 已提交
3299
	unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
C
Christoph Hellwig 已提交
3300
out_unlock:
3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
	if (!same_inode) {
		if (inode < src) {
			mutex_unlock(&src->i_mutex);
			mutex_unlock(&inode->i_mutex);
		} else {
			mutex_unlock(&inode->i_mutex);
			mutex_unlock(&src->i_mutex);
		}
	} else {
		mutex_unlock(&src->i_mutex);
	}
C
Christoph Hellwig 已提交
3312
out_fput:
3313
	fdput(src_file);
3314
out_drop_write:
A
Al Viro 已提交
3315
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
3316 3317 3318
	return ret;
}

3319
static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
3320 3321 3322
{
	struct btrfs_ioctl_clone_range_args args;

3323
	if (copy_from_user(&args, argp, sizeof(args)))
3324 3325 3326 3327 3328
		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
3329 3330 3331 3332 3333 3334
/*
 * 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.
 */
3335
static long btrfs_ioctl_trans_start(struct file *file)
C
Christoph Hellwig 已提交
3336
{
A
Al Viro 已提交
3337
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
3338 3339
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
3340
	int ret;
C
Christoph Hellwig 已提交
3341

3342
	ret = -EPERM;
3343
	if (!capable(CAP_SYS_ADMIN))
3344
		goto out;
3345

3346 3347
	ret = -EINPROGRESS;
	if (file->private_data)
C
Christoph Hellwig 已提交
3348
		goto out;
3349

L
Li Zefan 已提交
3350 3351 3352 3353
	ret = -EROFS;
	if (btrfs_root_readonly(root))
		goto out;

3354
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
3355 3356 3357
	if (ret)
		goto out;

J
Josef Bacik 已提交
3358
	atomic_inc(&root->fs_info->open_ioctl_trans);
3359

3360
	ret = -ENOMEM;
3361
	trans = btrfs_start_ioctl_transaction(root);
3362
	if (IS_ERR(trans))
3363 3364 3365 3366 3367 3368
		goto out_drop;

	file->private_data = trans;
	return 0;

out_drop:
J
Josef Bacik 已提交
3369
	atomic_dec(&root->fs_info->open_ioctl_trans);
A
Al Viro 已提交
3370
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
3371 3372 3373 3374
out:
	return ret;
}

3375 3376
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
A
Al Viro 已提交
3377
	struct inode *inode = file_inode(file);
3378 3379 3380 3381 3382 3383 3384 3385 3386
	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;
3387
	int ret;
3388 3389 3390 3391

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

3392 3393 3394 3395 3396 3397 3398 3399
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

	if (copy_from_user(&objectid, argp, sizeof(objectid))) {
		ret = -EFAULT;
		goto out;
	}
3400 3401

	if (!objectid)
3402
		objectid = BTRFS_FS_TREE_OBJECTID;
3403 3404 3405 3406 3407 3408

	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);
3409 3410 3411 3412
	if (IS_ERR(new_root)) {
		ret = PTR_ERR(new_root);
		goto out;
	}
3413 3414

	path = btrfs_alloc_path();
3415 3416 3417 3418
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}
3419 3420 3421
	path->leave_spinning = 1;

	trans = btrfs_start_transaction(root, 1);
3422
	if (IS_ERR(trans)) {
3423
		btrfs_free_path(path);
3424 3425
		ret = PTR_ERR(trans);
		goto out;
3426 3427
	}

3428
	dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
3429 3430
	di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
				   dir_id, "default", 7, 1);
3431
	if (IS_ERR_OR_NULL(di)) {
3432 3433
		btrfs_free_path(path);
		btrfs_end_transaction(trans, root);
3434 3435
		btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
			   "item, this isn't going to work");
3436 3437
		ret = -ENOENT;
		goto out;
3438 3439 3440 3441 3442 3443 3444
	}

	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);

3445
	btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
3446
	btrfs_end_transaction(trans, root);
3447 3448 3449
out:
	mnt_drop_write_file(file);
	return ret;
3450 3451
}

3452 3453
void btrfs_get_block_group_info(struct list_head *groups_list,
				struct btrfs_ioctl_space_info *space)
3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467
{
	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);
	}
}

3468
static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
J
Josef Bacik 已提交
3469 3470 3471 3472
{
	struct btrfs_ioctl_space_args space_args;
	struct btrfs_ioctl_space_info space;
	struct btrfs_ioctl_space_info *dest;
3473
	struct btrfs_ioctl_space_info *dest_orig;
3474
	struct btrfs_ioctl_space_info __user *user_dest;
J
Josef Bacik 已提交
3475
	struct btrfs_space_info *info;
3476 3477 3478 3479 3480
	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;
3481
	int alloc_size;
J
Josef Bacik 已提交
3482
	int ret = 0;
3483
	u64 slot_count = 0;
3484
	int i, c;
J
Josef Bacik 已提交
3485 3486 3487 3488 3489 3490

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

3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514
	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);
	}
3515 3516 3517 3518 3519 3520

	/* space_slots == 0 means they are asking for a count */
	if (space_args.space_slots == 0) {
		space_args.total_spaces = slot_count;
		goto out;
	}
3521

3522
	slot_count = min_t(u64, space_args.space_slots, slot_count);
3523

3524
	alloc_size = sizeof(*dest) * slot_count;
3525

3526 3527 3528 3529 3530 3531
	/* 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
3532
	space_args.total_spaces = 0;
3533 3534 3535 3536
	dest = kmalloc(alloc_size, GFP_NOFS);
	if (!dest)
		return -ENOMEM;
	dest_orig = dest;
J
Josef Bacik 已提交
3537

3538
	/* now we have a buffer to copy into */
3539 3540 3541
	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

3542 3543 3544
		if (!slot_count)
			break;

3545 3546 3547 3548 3549 3550 3551 3552 3553 3554
		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();
3555

3556 3557 3558 3559 3560
		if (!info)
			continue;
		down_read(&info->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&info->block_groups[c])) {
3561 3562
				btrfs_get_block_group_info(
					&info->block_groups[c], &space);
3563 3564 3565
				memcpy(dest, &space, sizeof(space));
				dest++;
				space_args.total_spaces++;
3566
				slot_count--;
3567
			}
3568 3569
			if (!slot_count)
				break;
3570 3571
		}
		up_read(&info->groups_sem);
J
Josef Bacik 已提交
3572 3573
	}

D
Daniel J Blueman 已提交
3574
	user_dest = (struct btrfs_ioctl_space_info __user *)
3575 3576 3577 3578 3579 3580 3581 3582
		(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
3583 3584 3585 3586 3587
		ret = -EFAULT;

	return ret;
}

C
Christoph Hellwig 已提交
3588 3589 3590 3591 3592 3593 3594 3595
/*
 * 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)
{
A
Al Viro 已提交
3596
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
3597 3598 3599 3600
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;

	trans = file->private_data;
3601 3602
	if (!trans)
		return -EINVAL;
C
Christoph Hellwig 已提交
3603
	file->private_data = NULL;
3604

3605 3606
	btrfs_end_transaction(trans, root);

J
Josef Bacik 已提交
3607
	atomic_dec(&root->fs_info->open_ioctl_trans);
3608

A
Al Viro 已提交
3609
	mnt_drop_write_file(file);
3610
	return 0;
C
Christoph Hellwig 已提交
3611 3612
}

3613 3614
static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
					    void __user *argp)
3615 3616 3617
{
	struct btrfs_trans_handle *trans;
	u64 transid;
T
Tsutomu Itoh 已提交
3618
	int ret;
3619

M
Miao Xie 已提交
3620
	trans = btrfs_attach_transaction_barrier(root);
3621 3622 3623 3624 3625 3626 3627 3628
	if (IS_ERR(trans)) {
		if (PTR_ERR(trans) != -ENOENT)
			return PTR_ERR(trans);

		/* No running transaction, don't bother */
		transid = root->fs_info->last_trans_committed;
		goto out;
	}
3629
	transid = trans->transid;
T
Tsutomu Itoh 已提交
3630
	ret = btrfs_commit_transaction_async(trans, root, 0);
3631 3632
	if (ret) {
		btrfs_end_transaction(trans, root);
T
Tsutomu Itoh 已提交
3633
		return ret;
3634
	}
3635
out:
3636 3637 3638 3639 3640 3641
	if (argp)
		if (copy_to_user(argp, &transid, sizeof(transid)))
			return -EFAULT;
	return 0;
}

3642 3643
static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
					   void __user *argp)
3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655
{
	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);
}

M
Miao Xie 已提交
3656
static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
J
Jan Schmidt 已提交
3657
{
A
Al Viro 已提交
3658
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
3659
	struct btrfs_ioctl_scrub_args *sa;
M
Miao Xie 已提交
3660
	int ret;
J
Jan Schmidt 已提交
3661 3662 3663 3664 3665 3666 3667 3668

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

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

M
Miao Xie 已提交
3669 3670 3671 3672 3673 3674
	if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
		ret = mnt_want_write_file(file);
		if (ret)
			goto out;
	}

3675
	ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
3676 3677
			      &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
			      0);
J
Jan Schmidt 已提交
3678 3679 3680 3681

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

M
Miao Xie 已提交
3682 3683 3684
	if (!(sa->flags & BTRFS_SCRUB_READONLY))
		mnt_drop_write_file(file);
out:
J
Jan Schmidt 已提交
3685 3686 3687 3688 3689 3690 3691 3692 3693
	kfree(sa);
	return ret;
}

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

3694
	return btrfs_scrub_cancel(root->fs_info);
J
Jan Schmidt 已提交
3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
}

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;
}

3719
static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3720
				      void __user *arg)
3721 3722 3723 3724 3725 3726 3727 3728
{
	struct btrfs_ioctl_get_dev_stats *sa;
	int ret;

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

3729 3730 3731 3732 3733 3734
	if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
		kfree(sa);
		return -EPERM;
	}

	ret = btrfs_get_dev_stats(root, sa);
3735 3736 3737 3738 3739 3740 3741 3742

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

	kfree(sa);
	return ret;
}

3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756
static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
{
	struct btrfs_ioctl_dev_replace_args *p;
	int ret;

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

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

	switch (p->cmd) {
	case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3757 3758 3759 3760
		if (root->fs_info->sb->s_flags & MS_RDONLY) {
			ret = -EROFS;
			goto out;
		}
3761 3762 3763
		if (atomic_xchg(
			&root->fs_info->mutually_exclusive_operation_running,
			1)) {
3764
			ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785
		} else {
			ret = btrfs_dev_replace_start(root, p);
			atomic_set(
			 &root->fs_info->mutually_exclusive_operation_running,
			 0);
		}
		break;
	case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
		btrfs_dev_replace_status(root->fs_info, p);
		ret = 0;
		break;
	case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
		ret = btrfs_dev_replace_cancel(root->fs_info, p);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	if (copy_to_user(arg, p, sizeof(*p)))
		ret = -EFAULT;
3786
out:
3787 3788 3789 3790
	kfree(p);
	return ret;
}

3791 3792 3793 3794
static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
{
	int ret = 0;
	int i;
3795
	u64 rel_ptr;
3796
	int size;
3797
	struct btrfs_ioctl_ino_path_args *ipa = NULL;
3798 3799 3800
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_path *path;

3801
	if (!capable(CAP_DAC_READ_SEARCH))
3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
		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) {
3830 3831
		rel_ptr = ipath->fspath->val[i] -
			  (u64)(unsigned long)ipath->fspath->val;
3832
		ipath->fspath->val[i] = rel_ptr;
3833 3834
	}

3835 3836
	ret = copy_to_user((void *)(unsigned long)ipa->fspath,
			   (void *)(unsigned long)ipath->fspath, size);
3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894
	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;
	}

3895
	size = min_t(u32, loi->size, 64 * 1024);
3896 3897 3898 3899 3900 3901 3902
	inodes = init_data_container(size);
	if (IS_ERR(inodes)) {
		ret = PTR_ERR(inodes);
		inodes = NULL;
		goto out;
	}

L
Liu Bo 已提交
3903 3904 3905
	ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
					  build_ino_list, inodes);
	if (ret == -EINVAL)
3906 3907 3908 3909
		ret = -ENOENT;
	if (ret < 0)
		goto out;

3910 3911
	ret = copy_to_user((void *)(unsigned long)loi->inodes,
			   (void *)(unsigned long)inodes, size);
3912 3913 3914 3915 3916
	if (ret)
		ret = -EFAULT;

out:
	btrfs_free_path(path);
3917
	vfree(inodes);
3918 3919 3920 3921 3922
	kfree(loi);

	return ret;
}

3923
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3924 3925 3926 3927 3928 3929
			       struct btrfs_ioctl_balance_args *bargs)
{
	struct btrfs_balance_control *bctl = fs_info->balance_ctl;

	bargs->flags = bctl->flags;

3930 3931 3932 3933
	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;
3934 3935
	if (atomic_read(&fs_info->balance_cancel_req))
		bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3936

3937 3938 3939
	memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
	memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
	memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3940 3941 3942 3943 3944 3945 3946 3947

	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));
	}
3948 3949
}

3950
static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3951
{
A
Al Viro 已提交
3952
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3953 3954 3955
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_ioctl_balance_args *bargs;
	struct btrfs_balance_control *bctl;
3956
	bool need_unlock; /* for mut. excl. ops lock */
3957 3958 3959 3960 3961
	int ret;

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

3962
	ret = mnt_want_write_file(file);
3963 3964 3965
	if (ret)
		return ret;

3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979
again:
	if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
		mutex_lock(&fs_info->volume_mutex);
		mutex_lock(&fs_info->balance_mutex);
		need_unlock = true;
		goto locked;
	}

	/*
	 * mut. excl. ops lock is locked.  Three possibilites:
	 *   (1) some other op is running
	 *   (2) balance is running
	 *   (3) balance is paused -- special case (think resume)
	 */
3980
	mutex_lock(&fs_info->balance_mutex);
3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007
	if (fs_info->balance_ctl) {
		/* this is either (2) or (3) */
		if (!atomic_read(&fs_info->balance_running)) {
			mutex_unlock(&fs_info->balance_mutex);
			if (!mutex_trylock(&fs_info->volume_mutex))
				goto again;
			mutex_lock(&fs_info->balance_mutex);

			if (fs_info->balance_ctl &&
			    !atomic_read(&fs_info->balance_running)) {
				/* this is (3) */
				need_unlock = false;
				goto locked;
			}

			mutex_unlock(&fs_info->balance_mutex);
			mutex_unlock(&fs_info->volume_mutex);
			goto again;
		} else {
			/* this is (2) */
			mutex_unlock(&fs_info->balance_mutex);
			ret = -EINPROGRESS;
			goto out;
		}
	} else {
		/* this is (1) */
		mutex_unlock(&fs_info->balance_mutex);
4008
		ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4009 4010 4011 4012 4013
		goto out;
	}

locked:
	BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4014 4015 4016 4017 4018

	if (arg) {
		bargs = memdup_user(arg, sizeof(*bargs));
		if (IS_ERR(bargs)) {
			ret = PTR_ERR(bargs);
4019
			goto out_unlock;
4020
		}
4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034

		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;
		}
4035 4036 4037 4038
	} else {
		bargs = NULL;
	}

4039
	if (fs_info->balance_ctl) {
4040 4041 4042 4043
		ret = -EINPROGRESS;
		goto out_bargs;
	}

4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056
	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;
4057 4058 4059
	} else {
		/* balance everything - no filters */
		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4060 4061
	}

4062
do_balance:
4063
	/*
4064 4065 4066 4067 4068
	 * Ownership of bctl and mutually_exclusive_operation_running
	 * goes to to btrfs_balance.  bctl is freed in __cancel_balance,
	 * or, if restriper was paused all the way until unmount, in
	 * free_fs_info.  mutually_exclusive_operation_running is
	 * cleared in __cancel_balance.
4069
	 */
4070 4071 4072 4073
	need_unlock = false;

	ret = btrfs_balance(bctl, bargs);

4074 4075 4076 4077 4078 4079 4080
	if (arg) {
		if (copy_to_user(arg, bargs, sizeof(*bargs)))
			ret = -EFAULT;
	}

out_bargs:
	kfree(bargs);
4081
out_unlock:
4082 4083
	mutex_unlock(&fs_info->balance_mutex);
	mutex_unlock(&fs_info->volume_mutex);
4084 4085 4086
	if (need_unlock)
		atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
out:
4087
	mnt_drop_write_file(file);
4088 4089 4090
	return ret;
}

4091 4092 4093 4094 4095 4096 4097 4098
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);
4099 4100
	case BTRFS_BALANCE_CTL_CANCEL:
		return btrfs_cancel_balance(root->fs_info);
4101 4102 4103 4104 4105
	}

	return -EINVAL;
}

4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138
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;
}

4139
static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4140
{
A
Al Viro 已提交
4141
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4142 4143 4144 4145 4146 4147 4148 4149
	struct btrfs_ioctl_quota_ctl_args *sa;
	struct btrfs_trans_handle *trans = NULL;
	int ret;
	int err;

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

4150 4151 4152
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4153 4154

	sa = memdup_user(arg, sizeof(*sa));
4155 4156 4157 4158
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4159

4160
	down_write(&root->fs_info->subvol_sem);
J
Jan Schmidt 已提交
4161 4162 4163 4164
	trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;
A
Arne Jansen 已提交
4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178
	}

	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;
	default:
		ret = -EINVAL;
		break;
	}

J
Jan Schmidt 已提交
4179 4180 4181
	err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
	if (err && !ret)
		ret = err;
A
Arne Jansen 已提交
4182 4183
out:
	kfree(sa);
4184
	up_write(&root->fs_info->subvol_sem);
4185 4186
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4187 4188 4189
	return ret;
}

4190
static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4191
{
A
Al Viro 已提交
4192
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4193 4194 4195 4196 4197 4198 4199 4200
	struct btrfs_ioctl_qgroup_assign_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4201 4202 4203
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4204 4205

	sa = memdup_user(arg, sizeof(*sa));
4206 4207 4208 4209
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231

	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);
4232 4233
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4234 4235 4236
	return ret;
}

4237
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4238
{
A
Al Viro 已提交
4239
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4240 4241 4242 4243 4244 4245 4246 4247
	struct btrfs_ioctl_qgroup_create_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4248 4249 4250
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4251 4252

	sa = memdup_user(arg, sizeof(*sa));
4253 4254 4255 4256
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4257

M
Miao Xie 已提交
4258 4259 4260 4261 4262
	if (!sa->qgroupid) {
		ret = -EINVAL;
		goto out;
	}

A
Arne Jansen 已提交
4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282
	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);
4283 4284
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4285 4286 4287
	return ret;
}

4288
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4289
{
A
Al Viro 已提交
4290
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4291 4292 4293 4294 4295 4296 4297 4298 4299
	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;

4300 4301 4302
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4303 4304

	sa = memdup_user(arg, sizeof(*sa));
4305 4306 4307 4308
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330

	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);
4331 4332
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4333 4334 4335
	return ret;
}

J
Jan Schmidt 已提交
4336 4337
static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4338
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370
	struct btrfs_ioctl_quota_rescan_args *qsa;
	int ret;

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

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

	qsa = memdup_user(arg, sizeof(*qsa));
	if (IS_ERR(qsa)) {
		ret = PTR_ERR(qsa);
		goto drop_write;
	}

	if (qsa->flags) {
		ret = -EINVAL;
		goto out;
	}

	ret = btrfs_qgroup_rescan(root->fs_info);

out:
	kfree(qsa);
drop_write:
	mnt_drop_write_file(file);
	return ret;
}

static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4371
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393
	struct btrfs_ioctl_quota_rescan_args *qsa;
	int ret = 0;

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

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

	if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
		qsa->flags = 1;
		qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
	}

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

	kfree(qsa);
	return ret;
}

4394 4395
static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4396
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4397 4398 4399 4400 4401 4402 4403

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

	return btrfs_qgroup_wait_for_completion(root->fs_info);
}

4404 4405
static long _btrfs_ioctl_set_received_subvol(struct file *file,
					    struct btrfs_ioctl_received_subvol_args *sa)
4406
{
A
Al Viro 已提交
4407
	struct inode *inode = file_inode(file);
4408 4409 4410 4411 4412
	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;
4413
	int received_uuid_changed;
4414

4415 4416 4417
	if (!inode_owner_or_capable(inode))
		return -EPERM;

4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433
	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;
	}

4434 4435 4436 4437 4438
	/*
	 * 1 - root item
	 * 2 - uuid items (received uuid + subvol uuid)
	 */
	trans = btrfs_start_transaction(root, 3);
4439 4440 4441 4442 4443 4444 4445 4446 4447 4448
	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;

4449 4450 4451 4452 4453 4454 4455 4456
	received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
				       BTRFS_UUID_SIZE);
	if (received_uuid_changed &&
	    !btrfs_is_empty_uuid(root_item->received_uuid))
		btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
				    root_item->received_uuid,
				    BTRFS_UUID_KEY_RECEIVED_SUBVOL,
				    root->root_key.objectid);
4457 4458 4459
	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);
4460 4461 4462 4463
	btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
	btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
	btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
	btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4464 4465 4466 4467 4468 4469

	ret = btrfs_update_root(trans, root->fs_info->tree_root,
				&root->root_key, &root->root_item);
	if (ret < 0) {
		btrfs_end_transaction(trans, root);
		goto out;
4470 4471 4472 4473 4474 4475 4476 4477
	}
	if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
		ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
					  sa->uuid,
					  BTRFS_UUID_KEY_RECEIVED_SUBVOL,
					  root->root_key.objectid);
		if (ret < 0 && ret != -EEXIST) {
			btrfs_abort_transaction(trans, root, ret);
4478
			goto out;
4479 4480 4481 4482 4483 4484
		}
	}
	ret = btrfs_commit_transaction(trans, root);
	if (ret < 0) {
		btrfs_abort_transaction(trans, root, ret);
		goto out;
4485 4486
	}

4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565
out:
	up_write(&root->fs_info->subvol_sem);
	mnt_drop_write_file(file);
	return ret;
}

#ifdef CONFIG_64BIT
static long btrfs_ioctl_set_received_subvol_32(struct file *file,
						void __user *arg)
{
	struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
	struct btrfs_ioctl_received_subvol_args *args64 = NULL;
	int ret = 0;

	args32 = memdup_user(arg, sizeof(*args32));
	if (IS_ERR(args32)) {
		ret = PTR_ERR(args32);
		args32 = NULL;
		goto out;
	}

	args64 = kmalloc(sizeof(*args64), GFP_NOFS);
	if (IS_ERR(args64)) {
		ret = PTR_ERR(args64);
		args64 = NULL;
		goto out;
	}

	memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
	args64->stransid = args32->stransid;
	args64->rtransid = args32->rtransid;
	args64->stime.sec = args32->stime.sec;
	args64->stime.nsec = args32->stime.nsec;
	args64->rtime.sec = args32->rtime.sec;
	args64->rtime.nsec = args32->rtime.nsec;
	args64->flags = args32->flags;

	ret = _btrfs_ioctl_set_received_subvol(file, args64);
	if (ret)
		goto out;

	memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
	args32->stransid = args64->stransid;
	args32->rtransid = args64->rtransid;
	args32->stime.sec = args64->stime.sec;
	args32->stime.nsec = args64->stime.nsec;
	args32->rtime.sec = args64->rtime.sec;
	args32->rtime.nsec = args64->rtime.nsec;
	args32->flags = args64->flags;

	ret = copy_to_user(arg, args32, sizeof(*args32));
	if (ret)
		ret = -EFAULT;

out:
	kfree(args32);
	kfree(args64);
	return ret;
}
#endif

static long btrfs_ioctl_set_received_subvol(struct file *file,
					    void __user *arg)
{
	struct btrfs_ioctl_received_subvol_args *sa = NULL;
	int ret = 0;

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

	ret = _btrfs_ioctl_set_received_subvol(file, sa);

	if (ret)
		goto out;

4566 4567 4568 4569 4570 4571 4572 4573 4574
	ret = copy_to_user(arg, sa, sizeof(*sa));
	if (ret)
		ret = -EFAULT;

out:
	kfree(sa);
	return ret;
}

4575 4576
static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4577
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4578
	size_t len;
4579
	int ret;
4580 4581 4582 4583 4584 4585 4586
	char label[BTRFS_LABEL_SIZE];

	spin_lock(&root->fs_info->super_lock);
	memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
	spin_unlock(&root->fs_info->super_lock);

	len = strnlen(label, BTRFS_LABEL_SIZE);
4587 4588

	if (len == BTRFS_LABEL_SIZE) {
4589 4590
		btrfs_warn(root->fs_info,
			"label is too long, return the first %zu bytes", --len);
4591 4592 4593 4594 4595 4596 4597
	}

	ret = copy_to_user(arg, label, len);

	return ret ? -EFAULT : 0;
}

4598 4599
static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4600
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612
	struct btrfs_super_block *super_block = root->fs_info->super_copy;
	struct btrfs_trans_handle *trans;
	char label[BTRFS_LABEL_SIZE];
	int ret;

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

	if (copy_from_user(label, arg, sizeof(label)))
		return -EFAULT;

	if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4613
		btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627
		       BTRFS_LABEL_SIZE - 1);
		return -EINVAL;
	}

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

	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out_unlock;
	}

4628
	spin_lock(&root->fs_info->super_lock);
4629
	strcpy(super_block->label, label);
4630
	spin_unlock(&root->fs_info->super_lock);
4631
	ret = btrfs_commit_transaction(trans, root);
4632 4633 4634 4635 4636 4637

out_unlock:
	mnt_drop_write_file(file);
	return ret;
}

4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673
#define INIT_FEATURE_FLAGS(suffix) \
	{ .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
	  .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
	  .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }

static int btrfs_ioctl_get_supported_features(struct file *file,
					      void __user *arg)
{
	static struct btrfs_ioctl_feature_flags features[3] = {
		INIT_FEATURE_FLAGS(SUPP),
		INIT_FEATURE_FLAGS(SAFE_SET),
		INIT_FEATURE_FLAGS(SAFE_CLEAR)
	};

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

	return 0;
}

static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
{
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
	struct btrfs_super_block *super_block = root->fs_info->super_copy;
	struct btrfs_ioctl_feature_flags features;

	features.compat_flags = btrfs_super_compat_flags(super_block);
	features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
	features.incompat_flags = btrfs_super_incompat_flags(super_block);

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

	return 0;
}

4674 4675
static int check_feature_bits(struct btrfs_root *root,
			      enum btrfs_feature_set set,
4676 4677 4678
			      u64 change_mask, u64 flags, u64 supported_flags,
			      u64 safe_set, u64 safe_clear)
{
4679 4680
	const char *type = btrfs_feature_set_names[set];
	char *names;
4681 4682 4683 4684 4685 4686
	u64 disallowed, unsupported;
	u64 set_mask = flags & change_mask;
	u64 clear_mask = ~flags & change_mask;

	unsupported = set_mask & ~supported_flags;
	if (unsupported) {
4687 4688 4689 4690 4691 4692 4693 4694
		names = btrfs_printable_features(set, unsupported);
		if (names) {
			btrfs_warn(root->fs_info,
			   "this kernel does not support the %s feature bit%s",
			   names, strchr(names, ',') ? "s" : "");
			kfree(names);
		} else
			btrfs_warn(root->fs_info,
4695 4696 4697 4698 4699 4700 4701
			   "this kernel does not support %s bits 0x%llx",
			   type, unsupported);
		return -EOPNOTSUPP;
	}

	disallowed = set_mask & ~safe_set;
	if (disallowed) {
4702 4703 4704 4705 4706 4707 4708 4709
		names = btrfs_printable_features(set, disallowed);
		if (names) {
			btrfs_warn(root->fs_info,
			   "can't set the %s feature bit%s while mounted",
			   names, strchr(names, ',') ? "s" : "");
			kfree(names);
		} else
			btrfs_warn(root->fs_info,
4710 4711 4712 4713 4714 4715 4716
			   "can't set %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	disallowed = clear_mask & ~safe_clear;
	if (disallowed) {
4717 4718 4719 4720 4721 4722 4723 4724
		names = btrfs_printable_features(set, disallowed);
		if (names) {
			btrfs_warn(root->fs_info,
			   "can't clear the %s feature bit%s while mounted",
			   names, strchr(names, ',') ? "s" : "");
			kfree(names);
		} else
			btrfs_warn(root->fs_info,
4725 4726 4727 4728 4729 4730 4731 4732 4733
			   "can't clear %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	return 0;
}

#define check_feature(root, change_mask, flags, mask_base)	\
4734
check_feature_bits(root, FEAT_##mask_base, change_mask, flags,	\
4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773
		   BTRFS_FEATURE_ ## mask_base ## _SUPP,	\
		   BTRFS_FEATURE_ ## mask_base ## _SAFE_SET,	\
		   BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)

static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
{
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
	struct btrfs_super_block *super_block = root->fs_info->super_copy;
	struct btrfs_ioctl_feature_flags flags[2];
	struct btrfs_trans_handle *trans;
	u64 newflags;
	int ret;

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

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

	/* Nothing to do */
	if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
	    !flags[0].incompat_flags)
		return 0;

	ret = check_feature(root, flags[0].compat_flags,
			    flags[1].compat_flags, COMPAT);
	if (ret)
		return ret;

	ret = check_feature(root, flags[0].compat_ro_flags,
			    flags[1].compat_ro_flags, COMPAT_RO);
	if (ret)
		return ret;

	ret = check_feature(root, flags[0].incompat_flags,
			    flags[1].incompat_flags, INCOMPAT);
	if (ret)
		return ret;

4774
	trans = btrfs_start_transaction(root, 0);
4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794
	if (IS_ERR(trans))
		return PTR_ERR(trans);

	spin_lock(&root->fs_info->super_lock);
	newflags = btrfs_super_compat_flags(super_block);
	newflags |= flags[0].compat_flags & flags[1].compat_flags;
	newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
	btrfs_set_super_compat_flags(super_block, newflags);

	newflags = btrfs_super_compat_ro_flags(super_block);
	newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
	newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
	btrfs_set_super_compat_ro_flags(super_block, newflags);

	newflags = btrfs_super_incompat_flags(super_block);
	newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
	newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
	btrfs_set_super_incompat_flags(super_block, newflags);
	spin_unlock(&root->fs_info->super_lock);

4795
	return btrfs_commit_transaction(trans, root);
4796 4797
}

C
Christoph Hellwig 已提交
4798 4799 4800
long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
{
A
Al Viro 已提交
4801
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4802
	void __user *argp = (void __user *)arg;
C
Christoph Hellwig 已提交
4803 4804

	switch (cmd) {
4805 4806 4807 4808 4809 4810
	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);
4811 4812
	case FITRIM:
		return btrfs_ioctl_fitrim(file, argp);
C
Christoph Hellwig 已提交
4813
	case BTRFS_IOC_SNAP_CREATE:
4814
		return btrfs_ioctl_snap_create(file, argp, 0);
4815
	case BTRFS_IOC_SNAP_CREATE_V2:
4816
		return btrfs_ioctl_snap_create_v2(file, argp, 0);
4817
	case BTRFS_IOC_SUBVOL_CREATE:
4818
		return btrfs_ioctl_snap_create(file, argp, 1);
A
Arne Jansen 已提交
4819 4820
	case BTRFS_IOC_SUBVOL_CREATE_V2:
		return btrfs_ioctl_snap_create_v2(file, argp, 1);
4821 4822
	case BTRFS_IOC_SNAP_DESTROY:
		return btrfs_ioctl_snap_destroy(file, argp);
4823 4824 4825 4826
	case BTRFS_IOC_SUBVOL_GETFLAGS:
		return btrfs_ioctl_subvol_getflags(file, argp);
	case BTRFS_IOC_SUBVOL_SETFLAGS:
		return btrfs_ioctl_subvol_setflags(file, argp);
4827 4828
	case BTRFS_IOC_DEFAULT_SUBVOL:
		return btrfs_ioctl_default_subvol(file, argp);
C
Christoph Hellwig 已提交
4829
	case BTRFS_IOC_DEFRAG:
C
Chris Mason 已提交
4830 4831 4832
		return btrfs_ioctl_defrag(file, NULL);
	case BTRFS_IOC_DEFRAG_RANGE:
		return btrfs_ioctl_defrag(file, argp);
C
Christoph Hellwig 已提交
4833
	case BTRFS_IOC_RESIZE:
4834
		return btrfs_ioctl_resize(file, argp);
C
Christoph Hellwig 已提交
4835
	case BTRFS_IOC_ADD_DEV:
4836
		return btrfs_ioctl_add_dev(root, argp);
C
Christoph Hellwig 已提交
4837
	case BTRFS_IOC_RM_DEV:
4838
		return btrfs_ioctl_rm_dev(file, argp);
J
Jan Schmidt 已提交
4839 4840 4841 4842
	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
4843
	case BTRFS_IOC_BALANCE:
4844
		return btrfs_ioctl_balance(file, NULL);
C
Christoph Hellwig 已提交
4845
	case BTRFS_IOC_CLONE:
4846 4847
		return btrfs_ioctl_clone(file, arg, 0, 0, 0);
	case BTRFS_IOC_CLONE_RANGE:
4848
		return btrfs_ioctl_clone_range(file, argp);
C
Christoph Hellwig 已提交
4849 4850 4851 4852
	case BTRFS_IOC_TRANS_START:
		return btrfs_ioctl_trans_start(file);
	case BTRFS_IOC_TRANS_END:
		return btrfs_ioctl_trans_end(file);
4853 4854 4855 4856
	case BTRFS_IOC_TREE_SEARCH:
		return btrfs_ioctl_tree_search(file, argp);
	case BTRFS_IOC_INO_LOOKUP:
		return btrfs_ioctl_ino_lookup(file, argp);
4857 4858 4859 4860
	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
4861 4862
	case BTRFS_IOC_SPACE_INFO:
		return btrfs_ioctl_space_info(root, argp);
4863 4864 4865
	case BTRFS_IOC_SYNC: {
		int ret;

4866
		ret = btrfs_start_delalloc_roots(root->fs_info, 0);
4867 4868 4869 4870 4871
		if (ret)
			return ret;
		ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
		return ret;
	}
4872
	case BTRFS_IOC_START_SYNC:
4873
		return btrfs_ioctl_start_sync(root, argp);
4874
	case BTRFS_IOC_WAIT_SYNC:
4875
		return btrfs_ioctl_wait_sync(root, argp);
J
Jan Schmidt 已提交
4876
	case BTRFS_IOC_SCRUB:
M
Miao Xie 已提交
4877
		return btrfs_ioctl_scrub(file, argp);
J
Jan Schmidt 已提交
4878 4879 4880 4881
	case BTRFS_IOC_SCRUB_CANCEL:
		return btrfs_ioctl_scrub_cancel(root, argp);
	case BTRFS_IOC_SCRUB_PROGRESS:
		return btrfs_ioctl_scrub_progress(root, argp);
4882
	case BTRFS_IOC_BALANCE_V2:
4883
		return btrfs_ioctl_balance(file, argp);
4884 4885
	case BTRFS_IOC_BALANCE_CTL:
		return btrfs_ioctl_balance_ctl(root, arg);
4886 4887
	case BTRFS_IOC_BALANCE_PROGRESS:
		return btrfs_ioctl_balance_progress(root, argp);
4888 4889
	case BTRFS_IOC_SET_RECEIVED_SUBVOL:
		return btrfs_ioctl_set_received_subvol(file, argp);
4890 4891 4892 4893
#ifdef CONFIG_64BIT
	case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
		return btrfs_ioctl_set_received_subvol_32(file, argp);
#endif
4894 4895
	case BTRFS_IOC_SEND:
		return btrfs_ioctl_send(file, argp);
4896
	case BTRFS_IOC_GET_DEV_STATS:
4897
		return btrfs_ioctl_get_dev_stats(root, argp);
A
Arne Jansen 已提交
4898
	case BTRFS_IOC_QUOTA_CTL:
4899
		return btrfs_ioctl_quota_ctl(file, argp);
A
Arne Jansen 已提交
4900
	case BTRFS_IOC_QGROUP_ASSIGN:
4901
		return btrfs_ioctl_qgroup_assign(file, argp);
A
Arne Jansen 已提交
4902
	case BTRFS_IOC_QGROUP_CREATE:
4903
		return btrfs_ioctl_qgroup_create(file, argp);
A
Arne Jansen 已提交
4904
	case BTRFS_IOC_QGROUP_LIMIT:
4905
		return btrfs_ioctl_qgroup_limit(file, argp);
J
Jan Schmidt 已提交
4906 4907 4908 4909
	case BTRFS_IOC_QUOTA_RESCAN:
		return btrfs_ioctl_quota_rescan(file, argp);
	case BTRFS_IOC_QUOTA_RESCAN_STATUS:
		return btrfs_ioctl_quota_rescan_status(file, argp);
4910 4911
	case BTRFS_IOC_QUOTA_RESCAN_WAIT:
		return btrfs_ioctl_quota_rescan_wait(file, argp);
4912 4913
	case BTRFS_IOC_DEV_REPLACE:
		return btrfs_ioctl_dev_replace(root, argp);
4914 4915
	case BTRFS_IOC_GET_FSLABEL:
		return btrfs_ioctl_get_fslabel(file, argp);
4916 4917
	case BTRFS_IOC_SET_FSLABEL:
		return btrfs_ioctl_set_fslabel(file, argp);
M
Mark Fasheh 已提交
4918 4919
	case BTRFS_IOC_FILE_EXTENT_SAME:
		return btrfs_ioctl_file_extent_same(file, argp);
4920 4921 4922 4923 4924 4925
	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
		return btrfs_ioctl_get_supported_features(file, argp);
	case BTRFS_IOC_GET_FEATURES:
		return btrfs_ioctl_get_features(file, argp);
	case BTRFS_IOC_SET_FEATURES:
		return btrfs_ioctl_set_features(file, argp);
C
Christoph Hellwig 已提交
4926 4927 4928 4929
	}

	return -ENOTTY;
}