ioctl.c 133.1 KB
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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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#include "qgroup.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,
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		       u64 off, u64 olen, u64 olen_aligned, u64 destoff,
		       int no_time_update);
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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);
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	unsigned int new_fl = 0;
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	if (ip->flags & BTRFS_INODE_SYNC)
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		new_fl |= S_SYNC;
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	if (ip->flags & BTRFS_INODE_IMMUTABLE)
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		new_fl |= S_IMMUTABLE;
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	if (ip->flags & BTRFS_INODE_APPEND)
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		new_fl |= S_APPEND;
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	if (ip->flags & BTRFS_INODE_NOATIME)
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		new_fl |= S_NOATIME;
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	if (ip->flags & BTRFS_INODE_DIRSYNC)
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		new_fl |= S_DIRSYNC;

	set_mask_bits(&inode->i_flags,
		      S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
		      new_fl);
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}

/*
 * 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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	inode_lock(inode);
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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 {
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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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		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:
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	inode_unlock(inode);
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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);
		}
	}
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	rcu_read_unlock();
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	if (!num_devices)
		return -EOPNOTSUPP;
	if (copy_from_user(&range, arg, sizeof(range)))
		return -EFAULT;
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	if (range.start > total_bytes ||
	    range.len < fs_info->sb->s_blocksize)
407
		return -EINVAL;
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409
	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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}

432
static noinline int create_subvol(struct inode *dir,
433
				  struct dentry *dentry,
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				  char *name, int namelen,
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				  u64 *async_transid,
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				  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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	ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
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	if (ret)
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		return ret;
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	/*
	 * Don't create subvolume whose level is not zero. Or qgroup will be
	 * screwed up since it assume subvolme qgroup's level to be 0.
	 */
	if (btrfs_qgroup_level(objectid))
		return -ENOSPC;

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	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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	 */
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	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_tree_block(trans, root, 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);
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	btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
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	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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	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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	key.type = BTRFS_ROOT_ITEM_KEY;
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549 550 551 552 553
	ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
				&root_item);
	if (ret)
		goto fail;

554 555
	key.offset = (u64)-1;
	new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
556 557
	if (IS_ERR(new_root)) {
		ret = PTR_ERR(new_root);
558
		btrfs_abort_transaction(trans, root, ret);
559 560
		goto fail;
	}
561 562 563

	btrfs_record_root_in_trans(trans, new_root);

564
	ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
565 566
	if (ret) {
		/* We potentially lose an unused inode item here */
567
		btrfs_abort_transaction(trans, root, ret);
568 569 570
		goto fail;
	}

571 572 573 574
	mutex_lock(&new_root->objectid_mutex);
	new_root->highest_objectid = new_dirid;
	mutex_unlock(&new_root->objectid_mutex);

C
Christoph Hellwig 已提交
575 576 577
	/*
	 * insert the directory item
	 */
578
	ret = btrfs_set_inode_index(dir, &index);
579 580 581 582
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
		goto fail;
	}
583 584

	ret = btrfs_insert_dir_item(trans, root,
585
				    name, namelen, dir, &key,
586
				    BTRFS_FT_DIR, index);
587 588
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
C
Christoph Hellwig 已提交
589
		goto fail;
590
	}
591

592 593 594 595
	btrfs_i_size_write(dir, dir->i_size + namelen * 2);
	ret = btrfs_update_inode(trans, root, dir);
	BUG_ON(ret);

596
	ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
597
				 objectid, root->root_key.objectid,
L
Li Zefan 已提交
598
				 btrfs_ino(dir), index, name, namelen);
599
	BUG_ON(ret);
C
Christoph Hellwig 已提交
600

601 602 603 604 605 606
	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
607
fail:
608 609
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
610 611
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);

S
Sage Weil 已提交
612 613 614
	if (async_transid) {
		*async_transid = trans->transid;
		err = btrfs_commit_transaction_async(trans, root, 1);
615 616
		if (err)
			err = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
617 618 619
	} else {
		err = btrfs_commit_transaction(trans, root);
	}
C
Christoph Hellwig 已提交
620 621
	if (err && !ret)
		ret = err;
622

623 624
	if (!ret) {
		inode = btrfs_lookup_dentry(dir, dentry);
625 626
		if (IS_ERR(inode))
			return PTR_ERR(inode);
627 628
		d_instantiate(dentry, inode);
	}
C
Christoph Hellwig 已提交
629 630 631
	return ret;
}

632
static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
{
	s64 writers;
	DEFINE_WAIT(wait);

	do {
		prepare_to_wait(&root->subv_writers->wait, &wait,
				TASK_UNINTERRUPTIBLE);

		writers = percpu_counter_sum(&root->subv_writers->counter);
		if (writers)
			schedule();

		finish_wait(&root->subv_writers->wait, &wait);
	} while (writers);
}

649 650 651 652
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
653
{
654
	struct inode *inode;
C
Christoph Hellwig 已提交
655 656
	struct btrfs_pending_snapshot *pending_snapshot;
	struct btrfs_trans_handle *trans;
657
	int ret;
C
Christoph Hellwig 已提交
658

659
	if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
C
Christoph Hellwig 已提交
660 661
		return -EINVAL;

662 663 664 665
	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
	if (!pending_snapshot)
		return -ENOMEM;

666 667
	pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
			GFP_NOFS);
668 669
	pending_snapshot->path = btrfs_alloc_path();
	if (!pending_snapshot->root_item || !pending_snapshot->path) {
670 671 672 673
		ret = -ENOMEM;
		goto free_pending;
	}

674
	atomic_inc(&root->will_be_snapshoted);
675
	smp_mb__after_atomic();
676
	btrfs_wait_for_no_snapshoting_writes(root);
677

678 679
	ret = btrfs_start_delalloc_inodes(root, 0);
	if (ret)
680
		goto dec_and_free;
681

682
	btrfs_wait_ordered_extents(root, -1);
683

684 685
	btrfs_init_block_rsv(&pending_snapshot->block_rsv,
			     BTRFS_BLOCK_RSV_TEMP);
686 687 688 689 690 691
	/*
	 * 1 - parent dir inode
	 * 2 - dir entries
	 * 1 - root item
	 * 2 - root ref/backref
	 * 1 - root of snapshot
692
	 * 1 - UUID item
693 694
	 */
	ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
695
					&pending_snapshot->block_rsv, 8,
696 697
					&pending_snapshot->qgroup_reserved,
					false);
698
	if (ret)
699
		goto dec_and_free;
700

701
	pending_snapshot->dentry = dentry;
C
Christoph Hellwig 已提交
702
	pending_snapshot->root = root;
L
Li Zefan 已提交
703
	pending_snapshot->readonly = readonly;
704
	pending_snapshot->dir = dir;
705
	pending_snapshot->inherit = inherit;
706

707
	trans = btrfs_start_transaction(root, 0);
708 709 710 711 712
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto fail;
	}

713
	spin_lock(&root->fs_info->trans_lock);
C
Christoph Hellwig 已提交
714 715
	list_add(&pending_snapshot->list,
		 &trans->transaction->pending_snapshots);
716
	spin_unlock(&root->fs_info->trans_lock);
S
Sage Weil 已提交
717 718 719 720
	if (async_transid) {
		*async_transid = trans->transid;
		ret = btrfs_commit_transaction_async(trans,
				     root->fs_info->extent_root, 1);
721 722
		if (ret)
			ret = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
723 724 725 726
	} else {
		ret = btrfs_commit_transaction(trans,
					       root->fs_info->extent_root);
	}
727
	if (ret)
728
		goto fail;
729 730 731 732 733

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

734 735 736 737
	ret = btrfs_orphan_cleanup(pending_snapshot->snap);
	if (ret)
		goto fail;

738
	inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
739 740 741 742
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto fail;
	}
743

744 745 746
	d_instantiate(dentry, inode);
	ret = 0;
fail:
747 748 749
	btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
					 &pending_snapshot->block_rsv,
					 pending_snapshot->qgroup_reserved);
750
dec_and_free:
751 752
	if (atomic_dec_and_test(&root->will_be_snapshoted))
		wake_up_atomic_t(&root->will_be_snapshoted);
753 754
free_pending:
	kfree(pending_snapshot->root_item);
755
	btrfs_free_path(pending_snapshot->path);
756 757
	kfree(pending_snapshot);

C
Christoph Hellwig 已提交
758 759 760
	return ret;
}

761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
/*  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().
 */

781
static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
782 783 784
{
	int error;

785
	if (d_really_is_negative(victim))
786 787
		return -ENOENT;

788
	BUG_ON(d_inode(victim->d_parent) != dir);
789
	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
790 791 792 793 794 795

	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
	if (error)
		return error;
	if (IS_APPEND(dir))
		return -EPERM;
796 797
	if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
	    IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
798 799
		return -EPERM;
	if (isdir) {
800
		if (!d_is_dir(victim))
801 802 803
			return -ENOTDIR;
		if (IS_ROOT(victim))
			return -EBUSY;
804
	} else if (d_is_dir(victim))
805 806 807 808 809 810 811 812
		return -EISDIR;
	if (IS_DEADDIR(dir))
		return -ENOENT;
	if (victim->d_flags & DCACHE_NFSFS_RENAMED)
		return -EBUSY;
	return 0;
}

813 814 815
/* copy of may_create in fs/namei.c() */
static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
{
816
	if (d_really_is_positive(child))
817 818 819 820 821 822 823 824 825 826 827
		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.
 */
828 829
static noinline int btrfs_mksubvol(struct path *parent,
				   char *name, int namelen,
S
Sage Weil 已提交
830
				   struct btrfs_root *snap_src,
A
Arne Jansen 已提交
831
				   u64 *async_transid, bool readonly,
832
				   struct btrfs_qgroup_inherit *inherit)
833
{
834
	struct inode *dir  = d_inode(parent->dentry);
835 836 837
	struct dentry *dentry;
	int error;

838 839 840
	error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (error == -EINTR)
		return error;
841 842 843 844 845 846 847

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

	error = -EEXIST;
848
	if (d_really_is_positive(dentry))
849 850
		goto out_dput;

851
	error = btrfs_may_create(dir, dentry);
852
	if (error)
853
		goto out_dput;
854

C
Chris Mason 已提交
855 856 857 858 859 860 861 862 863 864
	/*
	 * 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;

865 866 867 868 869
	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;

870
	if (snap_src) {
871
		error = create_snapshot(snap_src, dir, dentry, name, namelen,
A
Arne Jansen 已提交
872
					async_transid, readonly, inherit);
873
	} else {
874 875
		error = create_subvol(dir, dentry, name, namelen,
				      async_transid, inherit);
876
	}
877 878 879 880
	if (!error)
		fsnotify_mkdir(dir, dentry);
out_up_read:
	up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
881 882 883
out_dput:
	dput(dentry);
out_unlock:
A
Al Viro 已提交
884
	inode_unlock(dir);
885 886 887
	return error;
}

C
Chris Mason 已提交
888 889 890 891 892 893 894
/*
 * 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
 */
895
static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
C
Chris Mason 已提交
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
{
	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,
930
			    u64 *off, u32 thresh)
C
Chris Mason 已提交
931 932 933 934 935 936 937
{
	struct btrfs_path *path;
	struct btrfs_key min_key;
	struct extent_buffer *leaf;
	struct btrfs_file_extent_item *extent;
	int type;
	int ret;
938
	u64 ino = btrfs_ino(inode);
C
Chris Mason 已提交
939 940 941 942 943

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

944
	min_key.objectid = ino;
C
Chris Mason 已提交
945 946 947
	min_key.type = BTRFS_EXTENT_DATA_KEY;
	min_key.offset = *off;

948
	while (1) {
949
		ret = btrfs_search_forward(root, &min_key, path, newer_than);
C
Chris Mason 已提交
950 951
		if (ret != 0)
			goto none;
952
process_slot:
953
		if (min_key.objectid != ino)
C
Chris Mason 已提交
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
			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;
		}

971 972 973 974 975 976
		path->slots[0]++;
		if (path->slots[0] < btrfs_header_nritems(leaf)) {
			btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
			goto process_slot;
		}

C
Chris Mason 已提交
977 978 979 980 981 982 983 984 985 986 987
		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
988
static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
989 990
{
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
L
Li Zefan 已提交
991 992 993
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
	struct extent_map *em;
	u64 len = PAGE_CACHE_SIZE;
994

L
Li Zefan 已提交
995 996 997 998
	/*
	 * hopefully we have this extent in the tree already, try without
	 * the full extent lock
	 */
999
	read_lock(&em_tree->lock);
L
Li Zefan 已提交
1000
	em = lookup_extent_mapping(em_tree, start, len);
1001 1002
	read_unlock(&em_tree->lock);

L
Li Zefan 已提交
1003
	if (!em) {
1004 1005 1006
		struct extent_state *cached = NULL;
		u64 end = start + len - 1;

L
Li Zefan 已提交
1007
		/* get the big lock and read metadata off disk */
1008
		lock_extent_bits(io_tree, start, end, &cached);
L
Li Zefan 已提交
1009
		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1010
		unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
L
Li Zefan 已提交
1011 1012 1013 1014 1015 1016 1017

		if (IS_ERR(em))
			return NULL;
	}

	return em;
}
1018

L
Li Zefan 已提交
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
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);
1029 1030 1031
	if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
		ret = false;
	else if ((em->block_start + em->block_len == next->block_start) &&
1032
		 (em->block_len > SZ_128K && next->block_len > SZ_128K))
L
Li Zefan 已提交
1033 1034 1035
		ret = false;

	free_extent_map(next);
1036 1037 1038
	return ret;
}

1039
static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1040 1041
			       u64 *last_len, u64 *skip, u64 *defrag_end,
			       int compress)
1042
{
L
Li Zefan 已提交
1043
	struct extent_map *em;
1044
	int ret = 1;
L
Li Zefan 已提交
1045
	bool next_mergeable = true;
1046
	bool prev_mergeable = true;
1047 1048

	/*
1049
	 * make sure that once we start defragging an extent, we keep on
1050 1051 1052 1053 1054 1055 1056
	 * defragging it
	 */
	if (start < *defrag_end)
		return 1;

	*skip = 0;

L
Li Zefan 已提交
1057 1058 1059
	em = defrag_lookup_extent(inode, start);
	if (!em)
		return 0;
1060 1061

	/* this will cover holes, and inline extents */
1062
	if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1063
		ret = 0;
1064 1065 1066
		goto out;
	}

1067 1068 1069
	if (!*defrag_end)
		prev_mergeable = false;

L
Li Zefan 已提交
1070
	next_mergeable = defrag_check_next_extent(inode, em);
1071
	/*
L
Li Zefan 已提交
1072 1073
	 * we hit a real extent, if it is big or the next extent is not a
	 * real extent, don't bother defragging it
1074
	 */
1075
	if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1076
	    (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1077
		ret = 0;
1078
out:
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
	/*
	 * 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
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
/*
 * 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,
1114
				    unsigned long num_pages)
C
Christoph Hellwig 已提交
1115
{
C
Chris Mason 已提交
1116 1117 1118 1119
	unsigned long file_end;
	u64 isize = i_size_read(inode);
	u64 page_start;
	u64 page_end;
1120
	u64 page_cnt;
C
Chris Mason 已提交
1121 1122 1123
	int ret;
	int i;
	int i_done;
1124
	struct btrfs_ordered_extent *ordered;
C
Chris Mason 已提交
1125
	struct extent_state *cached_state = NULL;
1126
	struct extent_io_tree *tree;
1127
	gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
C
Chris Mason 已提交
1128 1129

	file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1130 1131 1132 1133
	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
1134 1135

	ret = btrfs_delalloc_reserve_space(inode,
1136 1137
			start_index << PAGE_CACHE_SHIFT,
			page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1138 1139 1140
	if (ret)
		return ret;
	i_done = 0;
1141
	tree = &BTRFS_I(inode)->io_tree;
C
Chris Mason 已提交
1142 1143

	/* step one, lock all the pages */
1144
	for (i = 0; i < page_cnt; i++) {
C
Chris Mason 已提交
1145
		struct page *page;
1146
again:
1147
		page = find_or_create_page(inode->i_mapping,
1148
					   start_index + i, mask);
C
Chris Mason 已提交
1149 1150 1151
		if (!page)
			break;

1152 1153 1154
		page_start = page_offset(page);
		page_end = page_start + PAGE_CACHE_SIZE - 1;
		while (1) {
1155
			lock_extent_bits(tree, page_start, page_end,
1156
					 &cached_state);
1157 1158
			ordered = btrfs_lookup_ordered_extent(inode,
							      page_start);
1159 1160
			unlock_extent_cached(tree, page_start, page_end,
					     &cached_state, GFP_NOFS);
1161 1162 1163 1164 1165 1166 1167
			if (!ordered)
				break;

			unlock_page(page);
			btrfs_start_ordered_extent(inode, ordered, 1);
			btrfs_put_ordered_extent(ordered);
			lock_page(page);
1168 1169 1170 1171 1172 1173 1174 1175 1176
			/*
			 * 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;
			}
1177 1178
		}

C
Chris Mason 已提交
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
		if (!PageUptodate(page)) {
			btrfs_readpage(NULL, page);
			lock_page(page);
			if (!PageUptodate(page)) {
				unlock_page(page);
				page_cache_release(page);
				ret = -EIO;
				break;
			}
		}
1189 1190 1191 1192 1193 1194 1195

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

C
Chris Mason 已提交
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
		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,
1216
			 page_start, page_end - 1, &cached_state);
C
Chris Mason 已提交
1217 1218
	clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
			  page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1219 1220
			  EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1221

1222
	if (i_done != page_cnt) {
1223 1224 1225
		spin_lock(&BTRFS_I(inode)->lock);
		BTRFS_I(inode)->outstanding_extents++;
		spin_unlock(&BTRFS_I(inode)->lock);
C
Chris Mason 已提交
1226
		btrfs_delalloc_release_space(inode,
1227 1228
				start_index << PAGE_CACHE_SHIFT,
				(page_cnt - i_done) << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1229 1230 1231
	}


1232 1233
	set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252

	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]);
	}
1253
	btrfs_delalloc_release_space(inode,
1254 1255
			start_index << PAGE_CACHE_SHIFT,
			page_cnt << PAGE_CACHE_SHIFT);
C
Chris Mason 已提交
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
	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
1266
	unsigned long last_index;
1267
	u64 isize = i_size_read(inode);
1268 1269 1270
	u64 last_len = 0;
	u64 skip = 0;
	u64 defrag_end = 0;
C
Chris Mason 已提交
1271
	u64 newer_off = range->start;
C
Christoph Hellwig 已提交
1272
	unsigned long i;
1273
	unsigned long ra_index = 0;
C
Christoph Hellwig 已提交
1274
	int ret;
C
Chris Mason 已提交
1275
	int defrag_count = 0;
1276
	int compress_type = BTRFS_COMPRESS_ZLIB;
1277
	u32 extent_thresh = range->extent_thresh;
1278
	unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT;
1279
	unsigned long cluster = max_cluster;
1280
	u64 new_align = ~((u64)SZ_128K - 1);
C
Chris Mason 已提交
1281 1282
	struct page **pages = NULL;

1283 1284 1285 1286 1287
	if (isize == 0)
		return 0;

	if (range->start >= isize)
		return -EINVAL;
1288 1289 1290 1291 1292 1293 1294

	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
1295

1296
	if (extent_thresh == 0)
1297
		extent_thresh = SZ_256K;
1298

C
Chris Mason 已提交
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
	/*
	 * 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;
	}

1312
	pages = kmalloc_array(max_cluster, sizeof(struct page *),
C
Chris Mason 已提交
1313 1314 1315 1316 1317 1318 1319
			GFP_NOFS);
	if (!pages) {
		ret = -ENOMEM;
		goto out_ra;
	}

	/* find the last page to defrag */
C
Chris Mason 已提交
1320
	if (range->start + range->len > range->start) {
1321
		last_index = min_t(u64, isize - 1,
C
Chris Mason 已提交
1322 1323
			 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
	} else {
1324
		last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
C
Chris Mason 已提交
1325 1326
	}

C
Chris Mason 已提交
1327 1328
	if (newer_than) {
		ret = find_new_extents(root, inode, newer_than,
1329
				       &newer_off, SZ_64K);
C
Chris Mason 已提交
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
		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)
1343
		max_to_defrag = last_index - i + 1;
C
Chris Mason 已提交
1344

L
Li Zefan 已提交
1345 1346 1347 1348 1349 1350 1351
	/*
	 * 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;

1352
	while (i <= last_index && defrag_count < max_to_defrag &&
1353
	       (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) {
C
Chris Mason 已提交
1354 1355 1356 1357 1358 1359 1360
		/*
		 * make sure we stop running if someone unmounts
		 * the FS
		 */
		if (!(inode->i_sb->s_flags & MS_ACTIVE))
			break;

1361
		if (btrfs_defrag_cancelled(root->fs_info)) {
1362
			btrfs_debug(root->fs_info, "defrag_file cancelled");
1363 1364 1365 1366
			ret = -EAGAIN;
			break;
		}

1367
		if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
L
Li Zefan 已提交
1368
					 extent_thresh, &last_len, &skip,
1369 1370
					 &defrag_end, range->flags &
					 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1371 1372 1373 1374 1375
			unsigned long next;
			/*
			 * the should_defrag function tells us how much to skip
			 * bump our counter by the suggested amount
			 */
1376
			next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE);
1377 1378 1379
			i = max(i + 1, next);
			continue;
		}
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392

		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);
1393
			ra_index += cluster;
1394
		}
1395

A
Al Viro 已提交
1396
		inode_lock(inode);
1397 1398
		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
			BTRFS_I(inode)->force_compress = compress_type;
1399
		ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1400
		if (ret < 0) {
A
Al Viro 已提交
1401
			inode_unlock(inode);
C
Chris Mason 已提交
1402
			goto out_ra;
1403
		}
C
Chris Mason 已提交
1404 1405

		defrag_count += ret;
1406
		balance_dirty_pages_ratelimited(inode->i_mapping);
A
Al Viro 已提交
1407
		inode_unlock(inode);
C
Chris Mason 已提交
1408 1409 1410 1411 1412

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

1413 1414 1415
			if (ret > 0)
				i += ret;

C
Chris Mason 已提交
1416 1417 1418
			newer_off = max(newer_off + 1,
					(u64)i << PAGE_CACHE_SHIFT);

1419 1420
			ret = find_new_extents(root, inode, newer_than,
					       &newer_off, SZ_64K);
C
Chris Mason 已提交
1421 1422 1423 1424 1425
			if (!ret) {
				range->start = newer_off;
				i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
			} else {
				break;
C
Christoph Hellwig 已提交
1426
			}
C
Chris Mason 已提交
1427
		} else {
1428
			if (ret > 0) {
L
Li Zefan 已提交
1429
				i += ret;
1430 1431
				last_len += ret << PAGE_CACHE_SHIFT;
			} else {
L
Li Zefan 已提交
1432
				i++;
1433 1434
				last_len = 0;
			}
C
Christoph Hellwig 已提交
1435 1436 1437
		}
	}

1438
	if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
C
Chris Mason 已提交
1439
		filemap_flush(inode->i_mapping);
1440 1441 1442 1443
		if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
			     &BTRFS_I(inode)->runtime_flags))
			filemap_flush(inode->i_mapping);
	}
C
Chris Mason 已提交
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459

	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);
	}

1460
	if (range->compress_type == BTRFS_COMPRESS_LZO) {
1461
		btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1462 1463
	}

1464
	ret = defrag_count;
1465

C
Chris Mason 已提交
1466
out_ra:
1467
	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
A
Al Viro 已提交
1468
		inode_lock(inode);
1469
		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
A
Al Viro 已提交
1470
		inode_unlock(inode);
1471
	}
C
Chris Mason 已提交
1472 1473 1474
	if (!file)
		kfree(ra);
	kfree(pages);
1475
	return ret;
C
Christoph Hellwig 已提交
1476 1477
}

1478
static noinline int btrfs_ioctl_resize(struct file *file,
1479
					void __user *arg)
C
Christoph Hellwig 已提交
1480 1481 1482 1483
{
	u64 new_size;
	u64 old_size;
	u64 devid = 1;
A
Al Viro 已提交
1484
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
1485 1486 1487 1488
	struct btrfs_ioctl_vol_args *vol_args;
	struct btrfs_trans_handle *trans;
	struct btrfs_device *device = NULL;
	char *sizestr;
1489
	char *retptr;
C
Christoph Hellwig 已提交
1490 1491 1492 1493
	char *devstr = NULL;
	int ret = 0;
	int mod = 0;

1494 1495 1496
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

1497 1498 1499 1500
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

1501 1502
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
1503
		mnt_drop_write_file(file);
1504
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1505 1506
	}

1507
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
1508
	vol_args = memdup_user(arg, sizeof(*vol_args));
1509 1510 1511 1512
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
1513 1514

	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
1515 1516 1517 1518 1519 1520 1521

	sizestr = vol_args->name;
	devstr = strchr(sizestr, ':');
	if (devstr) {
		sizestr = devstr + 1;
		*devstr = '\0';
		devstr = vol_args->name;
1522 1523 1524
		ret = kstrtoull(devstr, 10, &devid);
		if (ret)
			goto out_free;
1525 1526 1527 1528
		if (!devid) {
			ret = -EINVAL;
			goto out_free;
		}
1529
		btrfs_info(root->fs_info, "resizing devid %llu", devid);
C
Christoph Hellwig 已提交
1530
	}
M
Miao Xie 已提交
1531

1532
	device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
C
Christoph Hellwig 已提交
1533
	if (!device) {
1534
		btrfs_info(root->fs_info, "resizer unable to find device %llu",
1535
		       devid);
1536
		ret = -ENODEV;
1537
		goto out_free;
C
Christoph Hellwig 已提交
1538
	}
M
Miao Xie 已提交
1539 1540

	if (!device->writeable) {
1541 1542
		btrfs_info(root->fs_info,
			   "resizer unable to apply on readonly device %llu",
1543
		       devid);
1544
		ret = -EPERM;
L
Liu Bo 已提交
1545 1546 1547
		goto out_free;
	}

C
Christoph Hellwig 已提交
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
	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++;
		}
1558 1559
		new_size = memparse(sizestr, &retptr);
		if (*retptr != '\0' || new_size == 0) {
C
Christoph Hellwig 已提交
1560
			ret = -EINVAL;
1561
			goto out_free;
C
Christoph Hellwig 已提交
1562 1563 1564
		}
	}

1565
	if (device->is_tgtdev_for_dev_replace) {
1566
		ret = -EPERM;
1567 1568 1569
		goto out_free;
	}

1570
	old_size = btrfs_device_get_total_bytes(device);
C
Christoph Hellwig 已提交
1571 1572 1573 1574

	if (mod < 0) {
		if (new_size > old_size) {
			ret = -EINVAL;
1575
			goto out_free;
C
Christoph Hellwig 已提交
1576 1577 1578
		}
		new_size = old_size - new_size;
	} else if (mod > 0) {
1579
		if (new_size > ULLONG_MAX - old_size) {
1580
			ret = -ERANGE;
1581 1582
			goto out_free;
		}
C
Christoph Hellwig 已提交
1583 1584 1585
		new_size = old_size + new_size;
	}

1586
	if (new_size < SZ_256M) {
C
Christoph Hellwig 已提交
1587
		ret = -EINVAL;
1588
		goto out_free;
C
Christoph Hellwig 已提交
1589 1590 1591
	}
	if (new_size > device->bdev->bd_inode->i_size) {
		ret = -EFBIG;
1592
		goto out_free;
C
Christoph Hellwig 已提交
1593 1594
	}

1595
	new_size = div_u64(new_size, root->sectorsize);
C
Christoph Hellwig 已提交
1596 1597
	new_size *= root->sectorsize;

1598
	btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu",
1599
		      rcu_str_deref(device->name), new_size);
C
Christoph Hellwig 已提交
1600 1601

	if (new_size > old_size) {
1602
		trans = btrfs_start_transaction(root, 0);
1603 1604
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
1605
			goto out_free;
1606
		}
C
Christoph Hellwig 已提交
1607 1608
		ret = btrfs_grow_device(trans, device, new_size);
		btrfs_commit_transaction(trans, root);
1609
	} else if (new_size < old_size) {
C
Christoph Hellwig 已提交
1610
		ret = btrfs_shrink_device(device, new_size);
1611
	} /* equal, nothing need to do */
C
Christoph Hellwig 已提交
1612

1613
out_free:
C
Christoph Hellwig 已提交
1614
	kfree(vol_args);
1615 1616
out:
	mutex_unlock(&root->fs_info->volume_mutex);
1617
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1618
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1619 1620 1621
	return ret;
}

S
Sage Weil 已提交
1622
static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
A
Arne Jansen 已提交
1623 1624
				char *name, unsigned long fd, int subvol,
				u64 *transid, bool readonly,
1625
				struct btrfs_qgroup_inherit *inherit)
C
Christoph Hellwig 已提交
1626 1627
{
	int namelen;
1628
	int ret = 0;
C
Christoph Hellwig 已提交
1629

1630 1631 1632 1633
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;

S
Sage Weil 已提交
1634 1635
	namelen = strlen(name);
	if (strchr(name, '/')) {
C
Christoph Hellwig 已提交
1636
		ret = -EINVAL;
1637
		goto out_drop_write;
C
Christoph Hellwig 已提交
1638 1639
	}

1640 1641 1642
	if (name[0] == '.' &&
	   (namelen == 1 || (name[1] == '.' && namelen == 2))) {
		ret = -EEXIST;
1643
		goto out_drop_write;
1644 1645
	}

1646
	if (subvol) {
S
Sage Weil 已提交
1647
		ret = btrfs_mksubvol(&file->f_path, name, namelen,
A
Arne Jansen 已提交
1648
				     NULL, transid, readonly, inherit);
1649
	} else {
1650
		struct fd src = fdget(fd);
1651
		struct inode *src_inode;
1652
		if (!src.file) {
1653
			ret = -EINVAL;
1654
			goto out_drop_write;
1655 1656
		}

A
Al Viro 已提交
1657 1658
		src_inode = file_inode(src.file);
		if (src_inode->i_sb != file_inode(file)->i_sb) {
1659 1660
			btrfs_info(BTRFS_I(src_inode)->root->fs_info,
				   "Snapshot src from another FS");
1661
			ret = -EXDEV;
1662 1663 1664 1665 1666 1667
		} else if (!inode_owner_or_capable(src_inode)) {
			/*
			 * Subvolume creation is not restricted, but snapshots
			 * are limited to own subvolumes only
			 */
			ret = -EPERM;
1668 1669 1670 1671
		} else {
			ret = btrfs_mksubvol(&file->f_path, name, namelen,
					     BTRFS_I(src_inode)->root,
					     transid, readonly, inherit);
1672
		}
1673
		fdput(src);
1674
	}
1675 1676
out_drop_write:
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1677
out:
S
Sage Weil 已提交
1678 1679 1680 1681
	return ret;
}

static noinline int btrfs_ioctl_snap_create(struct file *file,
1682
					    void __user *arg, int subvol)
S
Sage Weil 已提交
1683
{
1684
	struct btrfs_ioctl_vol_args *vol_args;
S
Sage Weil 已提交
1685 1686
	int ret;

1687 1688 1689 1690
	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
1691

1692
	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
L
Li Zefan 已提交
1693
					      vol_args->fd, subvol,
A
Arne Jansen 已提交
1694
					      NULL, false, NULL);
1695

1696 1697 1698
	kfree(vol_args);
	return ret;
}
1699

1700 1701 1702 1703 1704 1705 1706
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
1707
	bool readonly = false;
A
Arne Jansen 已提交
1708
	struct btrfs_qgroup_inherit *inherit = NULL;
1709

1710 1711 1712 1713
	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';
1714

L
Li Zefan 已提交
1715
	if (vol_args->flags &
A
Arne Jansen 已提交
1716 1717
	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
	      BTRFS_SUBVOL_QGROUP_INHERIT)) {
L
Li Zefan 已提交
1718
		ret = -EOPNOTSUPP;
D
Dan Carpenter 已提交
1719
		goto free_args;
S
Sage Weil 已提交
1720
	}
1721 1722 1723

	if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
		ptr = &transid;
L
Li Zefan 已提交
1724 1725
	if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
		readonly = true;
A
Arne Jansen 已提交
1726 1727 1728
	if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
		if (vol_args->size > PAGE_CACHE_SIZE) {
			ret = -EINVAL;
D
Dan Carpenter 已提交
1729
			goto free_args;
A
Arne Jansen 已提交
1730 1731 1732 1733
		}
		inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
		if (IS_ERR(inherit)) {
			ret = PTR_ERR(inherit);
D
Dan Carpenter 已提交
1734
			goto free_args;
A
Arne Jansen 已提交
1735 1736
		}
	}
1737 1738

	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
A
Arne Jansen 已提交
1739
					      vol_args->fd, subvol, ptr,
1740
					      readonly, inherit);
D
Dan Carpenter 已提交
1741 1742
	if (ret)
		goto free_inherit;
1743

D
Dan Carpenter 已提交
1744 1745 1746 1747
	if (ptr && copy_to_user(arg +
				offsetof(struct btrfs_ioctl_vol_args_v2,
					transid),
				ptr, sizeof(*ptr)))
1748
		ret = -EFAULT;
D
Dan Carpenter 已提交
1749 1750

free_inherit:
A
Arne Jansen 已提交
1751
	kfree(inherit);
D
Dan Carpenter 已提交
1752 1753
free_args:
	kfree(vol_args);
C
Christoph Hellwig 已提交
1754 1755 1756
	return ret;
}

1757 1758 1759
static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
						void __user *arg)
{
A
Al Viro 已提交
1760
	struct inode *inode = file_inode(file);
1761 1762 1763 1764
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret = 0;
	u64 flags = 0;

L
Li Zefan 已提交
1765
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
		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
1782
	struct inode *inode = file_inode(file);
1783 1784 1785 1786 1787 1788
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	u64 root_flags;
	u64 flags;
	int ret = 0;

1789 1790 1791
	if (!inode_owner_or_capable(inode))
		return -EPERM;

1792 1793 1794
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;
1795

1796 1797 1798 1799
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1800

1801 1802 1803 1804
	if (copy_from_user(&flags, arg, sizeof(flags))) {
		ret = -EFAULT;
		goto out_drop_write;
	}
1805

1806 1807 1808 1809
	if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1810

1811 1812 1813 1814
	if (flags & ~BTRFS_SUBVOL_RDONLY) {
		ret = -EOPNOTSUPP;
		goto out_drop_write;
	}
1815 1816 1817 1818 1819

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

	/* nothing to do */
	if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1820
		goto out_drop_sem;
1821 1822

	root_flags = btrfs_root_flags(&root->root_item);
1823
	if (flags & BTRFS_SUBVOL_RDONLY) {
1824 1825
		btrfs_set_root_flags(&root->root_item,
				     root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1826 1827 1828 1829 1830 1831 1832 1833
	} 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,
1834
				     root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
			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;
		}
	}
1845 1846 1847 1848 1849 1850 1851

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

1852
	ret = btrfs_update_root(trans, root->fs_info->tree_root,
1853 1854 1855 1856 1857 1858
				&root->root_key, &root->root_item);

	btrfs_commit_transaction(trans, root);
out_reset:
	if (ret)
		btrfs_set_root_flags(&root->root_item, root_flags);
1859
out_drop_sem:
1860
	up_write(&root->fs_info->subvol_sem);
1861 1862 1863
out_drop_write:
	mnt_drop_write_file(file);
out:
1864 1865 1866
	return ret;
}

1867 1868 1869 1870 1871 1872
/*
 * helper to check if the subvolume references other subvolumes
 */
static noinline int may_destroy_subvol(struct btrfs_root *root)
{
	struct btrfs_path *path;
1873
	struct btrfs_dir_item *di;
1874
	struct btrfs_key key;
1875
	u64 dir_id;
1876 1877 1878 1879 1880 1881
	int ret;

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

1882 1883 1884 1885 1886 1887 1888
	/* 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) {
1889 1890 1891
			ret = -EPERM;
			btrfs_err(root->fs_info, "deleting default subvolume "
				  "%llu is not allowed", key.objectid);
1892 1893 1894 1895 1896
			goto out;
		}
		btrfs_release_path(path);
	}

1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
	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;
}

1920 1921 1922
static noinline int key_in_sk(struct btrfs_key *key,
			      struct btrfs_ioctl_search_key *sk)
{
1923 1924 1925 1926 1927 1928 1929 1930 1931
	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)
1932
		return 0;
1933 1934 1935 1936 1937 1938 1939

	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)
1940 1941 1942 1943 1944 1945 1946 1947
		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,
1948
			       size_t *buf_size,
1949
			       char __user *ubuf,
1950 1951 1952 1953 1954 1955
			       unsigned long *sk_offset,
			       int *num_found)
{
	u64 found_transid;
	struct extent_buffer *leaf;
	struct btrfs_ioctl_search_header sh;
1956
	struct btrfs_key test;
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
	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);

1978 1979 1980 1981
		btrfs_item_key_to_cpu(leaf, key, i);
		if (!key_in_sk(key, sk))
			continue;

1982
		if (sizeof(sh) + item_len > *buf_size) {
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
			if (*num_found) {
				ret = 1;
				goto out;
			}

			/*
			 * return one empty item back for v1, which does not
			 * handle -EOVERFLOW
			 */

1993
			*buf_size = sizeof(sh) + item_len;
1994
			item_len = 0;
1995 1996
			ret = -EOVERFLOW;
		}
1997

1998
		if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1999
			ret = 1;
2000
			goto out;
2001 2002 2003 2004 2005 2006 2007 2008 2009
		}

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

		/* copy search result header */
2010 2011 2012 2013 2014
		if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
			ret = -EFAULT;
			goto out;
		}

2015 2016 2017
		*sk_offset += sizeof(sh);

		if (item_len) {
2018
			char __user *up = ubuf + *sk_offset;
2019
			/* copy the item */
2020 2021 2022 2023 2024 2025
			if (read_extent_buffer_to_user(leaf, up,
						       item_off, item_len)) {
				ret = -EFAULT;
				goto out;
			}

2026 2027
			*sk_offset += item_len;
		}
2028
		(*num_found)++;
2029

2030 2031 2032
		if (ret) /* -EOVERFLOW from above */
			goto out;

2033 2034 2035 2036
		if (*num_found >= sk->nr_items) {
			ret = 1;
			goto out;
		}
2037 2038
	}
advance_key:
2039
	ret = 0;
2040 2041 2042 2043 2044 2045
	test.objectid = sk->max_objectid;
	test.type = sk->max_type;
	test.offset = sk->max_offset;
	if (btrfs_comp_cpu_keys(key, &test) >= 0)
		ret = 1;
	else if (key->offset < (u64)-1)
2046
		key->offset++;
2047
	else if (key->type < (u8)-1) {
2048
		key->offset = 0;
2049
		key->type++;
2050
	} else if (key->objectid < (u64)-1) {
2051 2052
		key->offset = 0;
		key->type = 0;
2053
		key->objectid++;
2054 2055
	} else
		ret = 1;
2056
out:
2057 2058 2059 2060 2061 2062 2063 2064 2065
	/*
	 *  0: all items from this leaf copied, continue with next
	 *  1: * more items can be copied, but unused buffer is too small
	 *     * all items were found
	 *     Either way, it will stops the loop which iterates to the next
	 *     leaf
	 *  -EOVERFLOW: item was to large for buffer
	 *  -EFAULT: could not copy extent buffer back to userspace
	 */
2066 2067 2068 2069
	return ret;
}

static noinline int search_ioctl(struct inode *inode,
2070
				 struct btrfs_ioctl_search_key *sk,
2071
				 size_t *buf_size,
2072
				 char __user *ubuf)
2073 2074 2075 2076 2077 2078 2079 2080 2081
{
	struct btrfs_root *root;
	struct btrfs_key key;
	struct btrfs_path *path;
	struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
	int ret;
	int num_found = 0;
	unsigned long sk_offset = 0;

2082 2083
	if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
		*buf_size = sizeof(struct btrfs_ioctl_search_header);
2084
		return -EOVERFLOW;
2085
	}
2086

2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099
	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)) {
2100
			btrfs_err(info, "could not find root %llu",
2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
			       sk->tree_id);
			btrfs_free_path(path);
			return -ENOENT;
		}
	}

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

2111
	while (1) {
2112
		ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2113 2114 2115 2116 2117
		if (ret != 0) {
			if (ret > 0)
				ret = 0;
			goto err;
		}
2118
		ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2119
				 &sk_offset, &num_found);
2120
		btrfs_release_path(path);
2121
		if (ret)
2122 2123 2124
			break;

	}
2125 2126
	if (ret > 0)
		ret = 0;
2127 2128 2129 2130 2131 2132 2133 2134 2135
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)
{
2136 2137
	struct btrfs_ioctl_search_args __user *uargs;
	struct btrfs_ioctl_search_key sk;
2138 2139 2140
	struct inode *inode;
	int ret;
	size_t buf_size;
2141 2142 2143 2144

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

2145 2146 2147 2148
	uargs = (struct btrfs_ioctl_search_args __user *)argp;

	if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
		return -EFAULT;
2149

2150
	buf_size = sizeof(uargs->buf);
2151

A
Al Viro 已提交
2152
	inode = file_inode(file);
2153
	ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2154 2155 2156 2157 2158 2159 2160 2161

	/*
	 * In the origin implementation an overflow is handled by returning a
	 * search header with a len of zero, so reset ret.
	 */
	if (ret == -EOVERFLOW)
		ret = 0;

2162
	if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2163 2164 2165 2166
		ret = -EFAULT;
	return ret;
}

G
Gerhard Heift 已提交
2167 2168 2169 2170 2171 2172 2173 2174
static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
					       void __user *argp)
{
	struct btrfs_ioctl_search_args_v2 __user *uarg;
	struct btrfs_ioctl_search_args_v2 args;
	struct inode *inode;
	int ret;
	size_t buf_size;
2175
	const size_t buf_limit = SZ_16M;
G
Gerhard Heift 已提交
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202

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

	/* copy search header and buffer size */
	uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
	if (copy_from_user(&args, uarg, sizeof(args)))
		return -EFAULT;

	buf_size = args.buf_size;

	if (buf_size < sizeof(struct btrfs_ioctl_search_header))
		return -EOVERFLOW;

	/* limit result size to 16MB */
	if (buf_size > buf_limit)
		buf_size = buf_limit;

	inode = file_inode(file);
	ret = search_ioctl(inode, &args.key, &buf_size,
			   (char *)(&uarg->buf[0]));
	if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
		ret = -EFAULT;
	else if (ret == -EOVERFLOW &&
		copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
		ret = -EFAULT;

2203 2204 2205
	return ret;
}

2206
/*
2207 2208 2209
 * Search INODE_REFs to identify path name of 'dirid' directory
 * in a 'tree_id' tree. and sets path name to 'name'.
 */
2210 2211 2212 2213 2214
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;
2215
	char *ptr;
2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232
	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;

2233
	ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2234 2235 2236 2237 2238 2239

	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)) {
2240
		btrfs_err(info, "could not find root %llu", tree_id);
2241 2242
		ret = -ENOENT;
		goto out;
2243 2244 2245 2246
	}

	key.objectid = dirid;
	key.type = BTRFS_INODE_REF_KEY;
2247
	key.offset = (u64)-1;
2248

2249
	while (1) {
2250 2251 2252
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		if (ret < 0)
			goto out;
2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
		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;
			}
		}
2263 2264 2265 2266 2267 2268 2269 2270 2271

		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;
2272 2273
		if (ptr < name) {
			ret = -ENAMETOOLONG;
2274
			goto out;
2275
		}
2276 2277

		*(ptr + len) = '/';
2278
		read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2279 2280 2281 2282

		if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
			break;

2283
		btrfs_release_path(path);
2284
		key.objectid = key.offset;
2285
		key.offset = (u64)-1;
2286 2287
		dirid = key.objectid;
	}
2288
	memmove(name, ptr, total_len);
2289
	name[total_len] = '\0';
2290 2291 2292
	ret = 0;
out:
	btrfs_free_path(path);
2293 2294 2295 2296 2297 2298 2299 2300
	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;
2301
	int ret = 0;
2302

J
Julia Lawall 已提交
2303 2304 2305
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
2306

A
Al Viro 已提交
2307
	inode = file_inode(file);
2308

2309 2310 2311 2312
	/*
	 * Unprivileged query to obtain the containing subvolume root id. The
	 * path is reset so it's consistent with btrfs_search_path_in_tree.
	 */
2313 2314 2315
	if (args->treeid == 0)
		args->treeid = BTRFS_I(inode)->root->root_key.objectid;

2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
	if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
		args->name[0] = 0;
		goto out;
	}

	if (!capable(CAP_SYS_ADMIN)) {
		ret = -EPERM;
		goto out;
	}

2326 2327 2328 2329
	ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
					args->treeid, args->objectid,
					args->name);

2330
out:
2331 2332 2333 2334
	if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
		ret = -EFAULT;

	kfree(args);
2335 2336 2337
	return ret;
}

2338 2339 2340
static noinline int btrfs_ioctl_snap_destroy(struct file *file,
					     void __user *arg)
{
A
Al Viro 已提交
2341
	struct dentry *parent = file->f_path.dentry;
2342
	struct dentry *dentry;
2343
	struct inode *dir = d_inode(parent);
2344 2345 2346 2347 2348
	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;
2349
	struct btrfs_block_rsv block_rsv;
2350
	u64 root_flags;
2351
	u64 qgroup_reserved;
2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
	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;
	}

2368
	err = mnt_want_write_file(file);
2369 2370 2371
	if (err)
		goto out;

2372

2373 2374
	err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (err == -EINTR)
2375
		goto out_drop_write;
2376 2377 2378 2379 2380 2381
	dentry = lookup_one_len(vol_args->name, parent, namelen);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		goto out_unlock_dir;
	}

2382
	if (d_really_is_negative(dentry)) {
2383 2384 2385 2386
		err = -ENOENT;
		goto out_dput;
	}

2387
	inode = d_inode(dentry);
2388
	dest = BTRFS_I(inode)->root;
2389
	if (!capable(CAP_SYS_ADMIN)) {
2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422
		/*
		 * 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;
	}

2423 2424 2425 2426 2427
	/* 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
2428
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2429 2430 2431 2432
		err = -EINVAL;
		goto out_dput;
	}

A
Al Viro 已提交
2433
	inode_lock(inode);
2434 2435 2436 2437 2438 2439 2440

	/*
	 * Don't allow to delete a subvolume with send in progress. This is
	 * inside the i_mutex so the error handling that has to drop the bit
	 * again is not run concurrently.
	 */
	spin_lock(&dest->root_item_lock);
2441 2442 2443
	root_flags = btrfs_root_flags(&dest->root_item);
	if (dest->send_in_progress == 0) {
		btrfs_set_root_flags(&dest->root_item,
2444 2445 2446 2447 2448 2449
				root_flags | BTRFS_ROOT_SUBVOL_DEAD);
		spin_unlock(&dest->root_item_lock);
	} else {
		spin_unlock(&dest->root_item_lock);
		btrfs_warn(root->fs_info,
			"Attempt to delete subvolume %llu during send",
2450
			dest->root_key.objectid);
2451
		err = -EPERM;
2452
		goto out_unlock_inode;
2453 2454
	}

2455 2456 2457 2458 2459 2460
	down_write(&root->fs_info->subvol_sem);

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

2461 2462 2463 2464 2465 2466
	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,
2467
					       5, &qgroup_reserved, true);
2468 2469 2470
	if (err)
		goto out_up_write;

2471 2472 2473
	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
2474
		goto out_release;
2475
	}
2476 2477
	trans->block_rsv = &block_rsv;
	trans->bytes_reserved = block_rsv.size;
2478

2479 2480 2481 2482
	ret = btrfs_unlink_subvol(trans, root, dir,
				dest->root_key.objectid,
				dentry->d_name.name,
				dentry->d_name.len);
2483 2484 2485 2486 2487
	if (ret) {
		err = ret;
		btrfs_abort_transaction(trans, root, ret);
		goto out_end_trans;
	}
2488 2489 2490 2491 2492 2493 2494 2495

	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);

2496
	if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2497 2498 2499
		ret = btrfs_insert_orphan_item(trans,
					root->fs_info->tree_root,
					dest->root_key.objectid);
2500 2501 2502 2503 2504
		if (ret) {
			btrfs_abort_transaction(trans, root, ret);
			err = ret;
			goto out_end_trans;
		}
2505
	}
2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526

	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;
		}
	}

2527
out_end_trans:
2528 2529
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
S
Sage Weil 已提交
2530
	ret = btrfs_end_transaction(trans, root);
2531 2532
	if (ret && !err)
		err = ret;
2533
	inode->i_flags |= S_DEAD;
2534 2535
out_release:
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2536 2537
out_up_write:
	up_write(&root->fs_info->subvol_sem);
2538 2539
	if (err) {
		spin_lock(&dest->root_item_lock);
2540 2541
		root_flags = btrfs_root_flags(&dest->root_item);
		btrfs_set_root_flags(&dest->root_item,
2542 2543 2544
				root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
		spin_unlock(&dest->root_item_lock);
	}
2545
out_unlock_inode:
A
Al Viro 已提交
2546
	inode_unlock(inode);
2547
	if (!err) {
2548
		d_invalidate(dentry);
2549 2550
		btrfs_invalidate_inodes(dest);
		d_delete(dentry);
2551
		ASSERT(dest->send_in_progress == 0);
2552 2553

		/* the last ref */
2554 2555 2556
		if (dest->ino_cache_inode) {
			iput(dest->ino_cache_inode);
			dest->ino_cache_inode = NULL;
2557
		}
2558 2559 2560 2561
	}
out_dput:
	dput(dentry);
out_unlock_dir:
A
Al Viro 已提交
2562
	inode_unlock(dir);
2563
out_drop_write:
A
Al Viro 已提交
2564
	mnt_drop_write_file(file);
2565 2566 2567 2568 2569
out:
	kfree(vol_args);
	return err;
}

C
Chris Mason 已提交
2570
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
C
Christoph Hellwig 已提交
2571
{
A
Al Viro 已提交
2572
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
2573
	struct btrfs_root *root = BTRFS_I(inode)->root;
C
Chris Mason 已提交
2574
	struct btrfs_ioctl_defrag_range_args *range;
Y
Yan Zheng 已提交
2575 2576
	int ret;

2577 2578 2579
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
L
Li Zefan 已提交
2580

2581 2582 2583
	if (btrfs_root_readonly(root)) {
		ret = -EROFS;
		goto out;
2584
	}
C
Christoph Hellwig 已提交
2585 2586 2587

	switch (inode->i_mode & S_IFMT) {
	case S_IFDIR:
2588 2589 2590 2591
		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto out;
		}
2592
		ret = btrfs_defrag_root(root);
2593 2594
		if (ret)
			goto out;
2595
		ret = btrfs_defrag_root(root->fs_info->extent_root);
C
Christoph Hellwig 已提交
2596 2597
		break;
	case S_IFREG:
2598 2599 2600 2601
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			goto out;
		}
C
Chris Mason 已提交
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613

		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);
2614
				goto out;
C
Chris Mason 已提交
2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
			}
			/* 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
2625
		ret = btrfs_defrag_file(file_inode(file), file,
C
Chris Mason 已提交
2626 2627 2628
					range, 0, 0);
		if (ret > 0)
			ret = 0;
C
Chris Mason 已提交
2629
		kfree(range);
C
Christoph Hellwig 已提交
2630
		break;
2631 2632
	default:
		ret = -EINVAL;
C
Christoph Hellwig 已提交
2633
	}
2634
out:
2635
	mnt_drop_write_file(file);
2636
	return ret;
C
Christoph Hellwig 已提交
2637 2638
}

2639
static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
C
Christoph Hellwig 已提交
2640 2641 2642 2643
{
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2644 2645 2646
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2647 2648
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
2649
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2650 2651
	}

2652
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
2653
	vol_args = memdup_user(arg, sizeof(*vol_args));
2654 2655 2656 2657
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2658

2659
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2660 2661
	ret = btrfs_init_new_device(root, vol_args->name);

A
Anand Jain 已提交
2662 2663 2664
	if (!ret)
		btrfs_info(root->fs_info, "disk added %s",vol_args->name);

C
Christoph Hellwig 已提交
2665
	kfree(vol_args);
2666 2667
out:
	mutex_unlock(&root->fs_info->volume_mutex);
2668
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
C
Christoph Hellwig 已提交
2669 2670 2671
	return ret;
}

2672
static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
C
Christoph Hellwig 已提交
2673
{
A
Al Viro 已提交
2674
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
2675 2676 2677
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2678 2679 2680
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2681 2682 2683
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
Y
Yan Zheng 已提交
2684

L
Li Zefan 已提交
2685
	vol_args = memdup_user(arg, sizeof(*vol_args));
2686 2687
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
D
Dan Carpenter 已提交
2688
		goto err_drop;
2689
	}
C
Christoph Hellwig 已提交
2690

2691
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2692

2693 2694 2695 2696 2697 2698 2699 2700
	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);
2701
	mutex_unlock(&root->fs_info->volume_mutex);
2702
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2703

2704 2705 2706
	if (!ret)
		btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);

2707 2708
out:
	kfree(vol_args);
D
Dan Carpenter 已提交
2709
err_drop:
2710
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
2711 2712 2713
	return ret;
}

J
Jan Schmidt 已提交
2714 2715
static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
{
2716
	struct btrfs_ioctl_fs_info_args *fi_args;
J
Jan Schmidt 已提交
2717 2718
	struct btrfs_device *device;
	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2719
	int ret = 0;
J
Jan Schmidt 已提交
2720

2721 2722 2723 2724
	fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
	if (!fi_args)
		return -ENOMEM;

2725
	mutex_lock(&fs_devices->device_list_mutex);
2726 2727
	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
2728

2729
	list_for_each_entry(device, &fs_devices->devices, dev_list) {
2730 2731
		if (device->devid > fi_args->max_id)
			fi_args->max_id = device->devid;
J
Jan Schmidt 已提交
2732 2733 2734
	}
	mutex_unlock(&fs_devices->device_list_mutex);

2735 2736 2737 2738
	fi_args->nodesize = root->fs_info->super_copy->nodesize;
	fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
	fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;

2739 2740
	if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
		ret = -EFAULT;
J
Jan Schmidt 已提交
2741

2742 2743
	kfree(fi_args);
	return ret;
J
Jan Schmidt 已提交
2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757
}

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;

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

2758
	if (!btrfs_is_empty_uuid(di_args->uuid))
J
Jan Schmidt 已提交
2759 2760 2761
		s_uuid = di_args->uuid;

	mutex_lock(&fs_devices->device_list_mutex);
2762
	dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
J
Jan Schmidt 已提交
2763 2764 2765 2766 2767 2768 2769

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

	di_args->devid = dev->devid;
2770 2771
	di_args->bytes_used = btrfs_device_get_bytes_used(dev);
	di_args->total_bytes = btrfs_device_get_total_bytes(dev);
J
Jan Schmidt 已提交
2772
	memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2773
	if (dev->name) {
2774 2775 2776 2777 2778 2779
		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();
2780 2781
		di_args->path[sizeof(di_args->path) - 1] = 0;
	} else {
2782
		di_args->path[0] = '\0';
2783
	}
J
Jan Schmidt 已提交
2784 2785

out:
2786
	mutex_unlock(&fs_devices->device_list_mutex);
J
Jan Schmidt 已提交
2787 2788 2789 2790 2791 2792 2793
	if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
		ret = -EFAULT;

	kfree(di_args);
	return ret;
}

2794
static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
M
Mark Fasheh 已提交
2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
{
	struct page *page;
	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;

	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;
}

2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832
static int gather_extent_pages(struct inode *inode, struct page **pages,
			       int num_pages, u64 off)
{
	int i;
	pgoff_t index = off >> PAGE_CACHE_SHIFT;

	for (i = 0; i < num_pages; i++) {
		pages[i] = extent_same_get_page(inode, index + i);
		if (!pages[i])
			return -ENOMEM;
	}
	return 0;
}

2833 2834 2835 2836 2837 2838 2839 2840 2841
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);
2842 2843 2844
		if ((!ordered ||
		     ordered->file_offset + ordered->len <= off ||
		     ordered->file_offset >= off + len) &&
2845
		    !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2846 2847 2848
				    off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
			if (ordered)
				btrfs_put_ordered_extent(ordered);
2849
			break;
2850
		}
2851 2852 2853 2854 2855 2856 2857
		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);
	}
}

2858
static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
M
Mark Fasheh 已提交
2859
{
A
Al Viro 已提交
2860 2861
	inode_unlock(inode1);
	inode_unlock(inode2);
M
Mark Fasheh 已提交
2862 2863
}

2864 2865 2866 2867 2868
static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
{
	if (inode1 < inode2)
		swap(inode1, inode2);

A
Al Viro 已提交
2869 2870
	inode_lock_nested(inode1, I_MUTEX_PARENT);
	inode_lock_nested(inode2, I_MUTEX_CHILD);
2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
}

static void btrfs_double_extent_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);
}

static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
				     struct inode *inode2, u64 loff2, u64 len)
M
Mark Fasheh 已提交
2882 2883 2884 2885 2886 2887
{
	if (inode1 < inode2) {
		swap(inode1, inode2);
		swap(loff1, loff2);
	}
	lock_extent_range(inode1, loff1, len);
2888
	lock_extent_range(inode2, loff2, len);
2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933
}

struct cmp_pages {
	int		num_pages;
	struct page	**src_pages;
	struct page	**dst_pages;
};

static void btrfs_cmp_data_free(struct cmp_pages *cmp)
{
	int i;
	struct page *pg;

	for (i = 0; i < cmp->num_pages; i++) {
		pg = cmp->src_pages[i];
		if (pg)
			page_cache_release(pg);
		pg = cmp->dst_pages[i];
		if (pg)
			page_cache_release(pg);
	}
	kfree(cmp->src_pages);
	kfree(cmp->dst_pages);
}

static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
				  struct inode *dst, u64 dst_loff,
				  u64 len, struct cmp_pages *cmp)
{
	int ret;
	int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT;
	struct page **src_pgarr, **dst_pgarr;

	/*
	 * We must gather up all the pages before we initiate our
	 * extent locking. We use an array for the page pointers. Size
	 * of the array is bounded by len, which is in turn bounded by
	 * BTRFS_MAX_DEDUPE_LEN.
	 */
	src_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS);
	dst_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS);
	if (!src_pgarr || !dst_pgarr) {
		kfree(src_pgarr);
		kfree(dst_pgarr);
		return -ENOMEM;
M
Mark Fasheh 已提交
2934
	}
2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948
	cmp->num_pages = num_pages;
	cmp->src_pages = src_pgarr;
	cmp->dst_pages = dst_pgarr;

	ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff);
	if (ret)
		goto out;

	ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff);

out:
	if (ret)
		btrfs_cmp_data_free(cmp);
	return 0;
M
Mark Fasheh 已提交
2949 2950 2951
}

static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2952
			  u64 dst_loff, u64 len, struct cmp_pages *cmp)
M
Mark Fasheh 已提交
2953 2954
{
	int ret = 0;
2955
	int i;
M
Mark Fasheh 已提交
2956 2957 2958 2959
	struct page *src_page, *dst_page;
	unsigned int cmp_len = PAGE_CACHE_SIZE;
	void *addr, *dst_addr;

2960
	i = 0;
M
Mark Fasheh 已提交
2961 2962 2963 2964
	while (len) {
		if (len < PAGE_CACHE_SIZE)
			cmp_len = len;

2965 2966 2967 2968 2969
		BUG_ON(i >= cmp->num_pages);

		src_page = cmp->src_pages[i];
		dst_page = cmp->dst_pages[i];

M
Mark Fasheh 已提交
2970 2971 2972 2973 2974 2975 2976
		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))
2977
			ret = -EBADE;
M
Mark Fasheh 已提交
2978 2979 2980 2981 2982 2983 2984 2985

		kunmap_atomic(addr);
		kunmap_atomic(dst_addr);

		if (ret)
			break;

		len -= cmp_len;
2986
		i++;
M
Mark Fasheh 已提交
2987 2988 2989 2990 2991
	}

	return ret;
}

2992 2993
static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
				     u64 olen)
M
Mark Fasheh 已提交
2994
{
2995
	u64 len = *plen;
M
Mark Fasheh 已提交
2996 2997
	u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;

2998
	if (off + olen > inode->i_size || off + olen < off)
M
Mark Fasheh 已提交
2999
		return -EINVAL;
3000 3001 3002 3003 3004

	/* if we extend to eof, continue to block boundary */
	if (off + len == inode->i_size)
		*plen = len = ALIGN(inode->i_size, bs) - off;

M
Mark Fasheh 已提交
3005 3006 3007 3008 3009 3010 3011
	/* Check that we are block aligned - btrfs_clone() requires this */
	if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
		return -EINVAL;

	return 0;
}

3012
static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
M
Mark Fasheh 已提交
3013 3014 3015
			     struct inode *dst, u64 dst_loff)
{
	int ret;
3016
	u64 len = olen;
3017
	struct cmp_pages cmp;
M
Mark Fasheh 已提交
3018 3019 3020
	int same_inode = 0;
	u64 same_lock_start = 0;
	u64 same_lock_len = 0;
M
Mark Fasheh 已提交
3021 3022

	if (src == dst)
M
Mark Fasheh 已提交
3023
		same_inode = 1;
M
Mark Fasheh 已提交
3024

3025 3026 3027
	if (len == 0)
		return 0;

M
Mark Fasheh 已提交
3028
	if (same_inode) {
A
Al Viro 已提交
3029
		inode_lock(src);
M
Mark Fasheh 已提交
3030

M
Mark Fasheh 已提交
3031 3032 3033
		ret = extent_same_check_offsets(src, loff, &len, olen);
		if (ret)
			goto out_unlock;
M
Mark Fasheh 已提交
3034

M
Mark Fasheh 已提交
3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072
		/*
		 * Single inode case wants the same checks, except we
		 * don't want our length pushed out past i_size as
		 * comparing that data range makes no sense.
		 *
		 * extent_same_check_offsets() will do this for an
		 * unaligned length at i_size, so catch it here and
		 * reject the request.
		 *
		 * This effectively means we require aligned extents
		 * for the single-inode case, whereas the other cases
		 * allow an unaligned length so long as it ends at
		 * i_size.
		 */
		if (len != olen) {
			ret = -EINVAL;
			goto out_unlock;
		}

		/* Check for overlapping ranges */
		if (dst_loff + len > loff && dst_loff < loff + len) {
			ret = -EINVAL;
			goto out_unlock;
		}

		same_lock_start = min_t(u64, loff, dst_loff);
		same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
	} else {
		btrfs_double_inode_lock(src, dst);

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

		ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
		if (ret)
			goto out_unlock;
	}
M
Mark Fasheh 已提交
3073 3074 3075 3076 3077 3078 3079 3080

	/* 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;
	}

3081 3082 3083 3084
	ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
	if (ret)
		goto out_unlock;

M
Mark Fasheh 已提交
3085 3086 3087 3088
	if (same_inode)
		lock_extent_range(src, same_lock_start, same_lock_len);
	else
		btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
3089

3090
	/* pass original length for comparison so we stay within i_size */
3091
	ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
M
Mark Fasheh 已提交
3092
	if (ret == 0)
3093
		ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
M
Mark Fasheh 已提交
3094

M
Mark Fasheh 已提交
3095 3096 3097 3098 3099
	if (same_inode)
		unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
			      same_lock_start + same_lock_len - 1);
	else
		btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3100 3101

	btrfs_cmp_data_free(&cmp);
M
Mark Fasheh 已提交
3102
out_unlock:
M
Mark Fasheh 已提交
3103
	if (same_inode)
A
Al Viro 已提交
3104
		inode_unlock(src);
M
Mark Fasheh 已提交
3105 3106
	else
		btrfs_double_inode_unlock(src, dst);
M
Mark Fasheh 已提交
3107 3108 3109 3110

	return ret;
}

3111
#define BTRFS_MAX_DEDUPE_LEN	SZ_16M
M
Mark Fasheh 已提交
3112

3113 3114
ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
				struct file *dst_file, u64 dst_loff)
M
Mark Fasheh 已提交
3115
{
3116 3117
	struct inode *src = file_inode(src_file);
	struct inode *dst = file_inode(dst_file);
M
Mark Fasheh 已提交
3118
	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3119
	ssize_t res;
M
Mark Fasheh 已提交
3120

3121 3122
	if (olen > BTRFS_MAX_DEDUPE_LEN)
		olen = BTRFS_MAX_DEDUPE_LEN;
M
Mark Fasheh 已提交
3123 3124 3125 3126 3127 3128 3129

	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.
		 */
3130
		return -EINVAL;
M
Mark Fasheh 已提交
3131 3132
	}

3133 3134 3135 3136
	res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
	if (res)
		return res;
	return olen;
M
Mark Fasheh 已提交
3137 3138
}

3139 3140 3141 3142
static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
				     struct inode *inode,
				     u64 endoff,
				     const u64 destoff,
3143 3144
				     const u64 olen,
				     int no_time_update)
3145 3146 3147 3148 3149
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;

	inode_inc_iversion(inode);
3150 3151
	if (!no_time_update)
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171
	/*
	 * We round up to the block size at eof when determining which
	 * extents to clone above, but shouldn't round up the file size.
	 */
	if (endoff > destoff + olen)
		endoff = destoff + olen;
	if (endoff > inode->i_size)
		btrfs_i_size_write(inode, endoff);

	ret = btrfs_update_inode(trans, root, inode);
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
		btrfs_end_transaction(trans, root);
		goto out;
	}
	ret = btrfs_end_transaction(trans, root);
out:
	return ret;
}

3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188
static void clone_update_extent_map(struct inode *inode,
				    const struct btrfs_trans_handle *trans,
				    const struct btrfs_path *path,
				    const u64 hole_offset,
				    const u64 hole_len)
{
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
	struct extent_map *em;
	int ret;

	em = alloc_extent_map();
	if (!em) {
		set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
			&BTRFS_I(inode)->runtime_flags);
		return;
	}

3189 3190 3191 3192 3193
	if (path) {
		struct btrfs_file_extent_item *fi;

		fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
				    struct btrfs_file_extent_item);
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
		btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
		em->generation = -1;
		if (btrfs_file_extent_type(path->nodes[0], fi) ==
		    BTRFS_FILE_EXTENT_INLINE)
			set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
				&BTRFS_I(inode)->runtime_flags);
	} else {
		em->start = hole_offset;
		em->len = hole_len;
		em->ram_bytes = em->len;
		em->orig_start = hole_offset;
		em->block_start = EXTENT_MAP_HOLE;
		em->block_len = 0;
		em->orig_block_len = 0;
		em->compress_type = BTRFS_COMPRESS_NONE;
		em->generation = trans->transid;
	}

	while (1) {
		write_lock(&em_tree->lock);
		ret = add_extent_mapping(em_tree, em, 1);
		write_unlock(&em_tree->lock);
		if (ret != -EEXIST) {
			free_extent_map(em);
			break;
		}
		btrfs_drop_extent_cache(inode, em->start,
					em->start + em->len - 1, 0);
	}

3224
	if (ret)
3225 3226 3227 3228
		set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
			&BTRFS_I(inode)->runtime_flags);
}

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 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372
/*
 * Make sure we do not end up inserting an inline extent into a file that has
 * already other (non-inline) extents. If a file has an inline extent it can
 * not have any other extents and the (single) inline extent must start at the
 * file offset 0. Failing to respect these rules will lead to file corruption,
 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
 *
 * We can have extents that have been already written to disk or we can have
 * dirty ranges still in delalloc, in which case the extent maps and items are
 * created only when we run delalloc, and the delalloc ranges might fall outside
 * the range we are currently locking in the inode's io tree. So we check the
 * inode's i_size because of that (i_size updates are done while holding the
 * i_mutex, which we are holding here).
 * We also check to see if the inode has a size not greater than "datal" but has
 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
 * protected against such concurrent fallocate calls by the i_mutex).
 *
 * If the file has no extents but a size greater than datal, do not allow the
 * copy because we would need turn the inline extent into a non-inline one (even
 * with NO_HOLES enabled). If we find our destination inode only has one inline
 * extent, just overwrite it with the source inline extent if its size is less
 * than the source extent's size, or we could copy the source inline extent's
 * data into the destination inode's inline extent if the later is greater then
 * the former.
 */
static int clone_copy_inline_extent(struct inode *src,
				    struct inode *dst,
				    struct btrfs_trans_handle *trans,
				    struct btrfs_path *path,
				    struct btrfs_key *new_key,
				    const u64 drop_start,
				    const u64 datal,
				    const u64 skip,
				    const u64 size,
				    char *inline_data)
{
	struct btrfs_root *root = BTRFS_I(dst)->root;
	const u64 aligned_end = ALIGN(new_key->offset + datal,
				      root->sectorsize);
	int ret;
	struct btrfs_key key;

	if (new_key->offset > 0)
		return -EOPNOTSUPP;

	key.objectid = btrfs_ino(dst);
	key.type = BTRFS_EXTENT_DATA_KEY;
	key.offset = 0;
	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
	if (ret < 0) {
		return ret;
	} else if (ret > 0) {
		if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
			ret = btrfs_next_leaf(root, path);
			if (ret < 0)
				return ret;
			else if (ret > 0)
				goto copy_inline_extent;
		}
		btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
		if (key.objectid == btrfs_ino(dst) &&
		    key.type == BTRFS_EXTENT_DATA_KEY) {
			ASSERT(key.offset > 0);
			return -EOPNOTSUPP;
		}
	} else if (i_size_read(dst) <= datal) {
		struct btrfs_file_extent_item *ei;
		u64 ext_len;

		/*
		 * If the file size is <= datal, make sure there are no other
		 * extents following (can happen do to an fallocate call with
		 * the flag FALLOC_FL_KEEP_SIZE).
		 */
		ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
				    struct btrfs_file_extent_item);
		/*
		 * If it's an inline extent, it can not have other extents
		 * following it.
		 */
		if (btrfs_file_extent_type(path->nodes[0], ei) ==
		    BTRFS_FILE_EXTENT_INLINE)
			goto copy_inline_extent;

		ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
		if (ext_len > aligned_end)
			return -EOPNOTSUPP;

		ret = btrfs_next_item(root, path);
		if (ret < 0) {
			return ret;
		} else if (ret == 0) {
			btrfs_item_key_to_cpu(path->nodes[0], &key,
					      path->slots[0]);
			if (key.objectid == btrfs_ino(dst) &&
			    key.type == BTRFS_EXTENT_DATA_KEY)
				return -EOPNOTSUPP;
		}
	}

copy_inline_extent:
	/*
	 * We have no extent items, or we have an extent at offset 0 which may
	 * or may not be inlined. All these cases are dealt the same way.
	 */
	if (i_size_read(dst) > datal) {
		/*
		 * If the destination inode has an inline extent...
		 * This would require copying the data from the source inline
		 * extent into the beginning of the destination's inline extent.
		 * But this is really complex, both extents can be compressed
		 * or just one of them, which would require decompressing and
		 * re-compressing data (which could increase the new compressed
		 * size, not allowing the compressed data to fit anymore in an
		 * inline extent).
		 * So just don't support this case for now (it should be rare,
		 * we are not really saving space when cloning inline extents).
		 */
		return -EOPNOTSUPP;
	}

	btrfs_release_path(path);
	ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
	if (ret)
		return ret;
	ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
	if (ret)
		return ret;

	if (skip) {
		const u32 start = btrfs_file_extent_calc_inline_size(0);

		memmove(inline_data + start, inline_data + start + skip, datal);
	}

	write_extent_buffer(path->nodes[0], inline_data,
			    btrfs_item_ptr_offset(path->nodes[0],
						  path->slots[0]),
			    size);
	inode_add_bytes(dst, datal);

	return 0;
}

3373 3374 3375 3376 3377 3378 3379
/**
 * 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
3380
 * @olen_aligned: Block-aligned value of olen
3381
 * @destoff: Offset within @inode to start clone
3382
 * @no_time_update: Whether to update mtime/ctime on the target inode
3383 3384
 */
static int btrfs_clone(struct inode *src, struct inode *inode,
3385
		       const u64 off, const u64 olen, const u64 olen_aligned,
3386
		       const u64 destoff, int no_time_update)
C
Christoph Hellwig 已提交
3387 3388
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
3389
	struct btrfs_path *path = NULL;
C
Christoph Hellwig 已提交
3390
	struct extent_buffer *leaf;
3391 3392
	struct btrfs_trans_handle *trans;
	char *buf = NULL;
Y
Yan Zheng 已提交
3393
	struct btrfs_key key;
C
Christoph Hellwig 已提交
3394 3395
	u32 nritems;
	int slot;
Y
Yan Zheng 已提交
3396
	int ret;
3397 3398
	const u64 len = olen_aligned;
	u64 last_dest_end = destoff;
Y
Yan Zheng 已提交
3399 3400

	ret = -ENOMEM;
3401
	buf = vmalloc(root->nodesize);
Y
Yan Zheng 已提交
3402
	if (!buf)
3403
		return ret;
Y
Yan Zheng 已提交
3404 3405 3406 3407

	path = btrfs_alloc_path();
	if (!path) {
		vfree(buf);
3408
		return ret;
3409 3410
	}

3411
	path->reada = READA_FORWARD;
3412
	/* clone data */
L
Li Zefan 已提交
3413
	key.objectid = btrfs_ino(src);
Y
Yan Zheng 已提交
3414
	key.type = BTRFS_EXTENT_DATA_KEY;
3415
	key.offset = off;
C
Christoph Hellwig 已提交
3416 3417

	while (1) {
3418
		u64 next_key_min_offset = key.offset + 1;
3419

C
Christoph Hellwig 已提交
3420 3421 3422 3423
		/*
		 * note the key will change type as we walk through the
		 * tree.
		 */
3424
		path->leave_spinning = 1;
3425 3426
		ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
				0, 0);
C
Christoph Hellwig 已提交
3427 3428
		if (ret < 0)
			goto out;
3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439
		/*
		 * First search, if no extent item that starts at offset off was
		 * found but the previous item is an extent item, it's possible
		 * it might overlap our target range, therefore process it.
		 */
		if (key.offset == off && ret > 0 && path->slots[0] > 0) {
			btrfs_item_key_to_cpu(path->nodes[0], &key,
					      path->slots[0] - 1);
			if (key.type == BTRFS_EXTENT_DATA_KEY)
				path->slots[0]--;
		}
C
Christoph Hellwig 已提交
3440

Y
Yan Zheng 已提交
3441
		nritems = btrfs_header_nritems(path->nodes[0]);
3442
process_slot:
Y
Yan Zheng 已提交
3443
		if (path->slots[0] >= nritems) {
3444
			ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
C
Christoph Hellwig 已提交
3445 3446 3447 3448
			if (ret < 0)
				goto out;
			if (ret > 0)
				break;
Y
Yan Zheng 已提交
3449
			nritems = btrfs_header_nritems(path->nodes[0]);
C
Christoph Hellwig 已提交
3450 3451 3452 3453
		}
		leaf = path->nodes[0];
		slot = path->slots[0];

Y
Yan Zheng 已提交
3454
		btrfs_item_key_to_cpu(leaf, &key, slot);
3455
		if (key.type > BTRFS_EXTENT_DATA_KEY ||
L
Li Zefan 已提交
3456
		    key.objectid != btrfs_ino(src))
C
Christoph Hellwig 已提交
3457 3458
			break;

3459
		if (key.type == BTRFS_EXTENT_DATA_KEY) {
3460 3461
			struct btrfs_file_extent_item *extent;
			int type;
Z
Zheng Yan 已提交
3462 3463
			u32 size;
			struct btrfs_key new_key;
3464 3465 3466
			u64 disko = 0, diskl = 0;
			u64 datao = 0, datal = 0;
			u8 comp;
3467
			u64 drop_start;
Z
Zheng Yan 已提交
3468

3469 3470 3471 3472
			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);
3473 3474
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
C
Chris Mason 已提交
3475 3476 3477 3478
				disko = btrfs_file_extent_disk_bytenr(leaf,
								      extent);
				diskl = btrfs_file_extent_disk_num_bytes(leaf,
								 extent);
3479
				datao = btrfs_file_extent_offset(leaf, extent);
C
Chris Mason 已提交
3480 3481
				datal = btrfs_file_extent_num_bytes(leaf,
								    extent);
3482 3483 3484 3485 3486
			} 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
3487

3488 3489 3490 3491 3492 3493
			/*
			 * The first search might have left us at an extent
			 * item that ends before our target range's start, can
			 * happen if we have holes and NO_HOLES feature enabled.
			 */
			if (key.offset + datal <= off) {
3494 3495
				path->slots[0]++;
				goto process_slot;
3496 3497
			} else if (key.offset >= off + len) {
				break;
3498
			}
3499
			next_key_min_offset = key.offset + datal;
3500 3501 3502 3503 3504 3505 3506
			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;
3507

Z
Zheng Yan 已提交
3508
			memcpy(&new_key, &key, sizeof(new_key));
L
Li Zefan 已提交
3509
			new_key.objectid = btrfs_ino(inode);
3510 3511 3512 3513
			if (off <= key.offset)
				new_key.offset = key.offset + destoff - off;
			else
				new_key.offset = destoff;
Z
Zheng Yan 已提交
3514

3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526
			/*
			 * Deal with a hole that doesn't have an extent item
			 * that represents it (NO_HOLES feature enabled).
			 * This hole is either in the middle of the cloning
			 * range or at the beginning (fully overlaps it or
			 * partially overlaps it).
			 */
			if (new_key.offset != last_dest_end)
				drop_start = last_dest_end;
			else
				drop_start = new_key.offset;

3527 3528 3529 3530 3531 3532
			/*
			 * 1 - adjusting old extent (we may have to split it)
			 * 1 - add new extent
			 * 1 - inode update
			 */
			trans = btrfs_start_transaction(root, 3);
3533 3534 3535 3536 3537
			if (IS_ERR(trans)) {
				ret = PTR_ERR(trans);
				goto out;
			}

3538 3539
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
3540 3541 3542 3543 3544
				/*
				 *    a  | --- range to clone ---|  b
				 * | ------------- extent ------------- |
				 */

3545
				/* subtract range b */
3546 3547 3548
				if (key.offset + datal > off + len)
					datal = off + len - key.offset;

3549
				/* subtract range a */
3550 3551 3552 3553 3554
				if (off > key.offset) {
					datao += off - key.offset;
					datal -= off - key.offset;
				}

J
Josef Bacik 已提交
3555
				ret = btrfs_drop_extents(trans, root, inode,
3556
							 drop_start,
3557
							 new_key.offset + datal,
3558
							 1);
3559
				if (ret) {
3560
					if (ret != -EOPNOTSUPP)
3561 3562
						btrfs_abort_transaction(trans,
								root, ret);
3563 3564 3565
					btrfs_end_transaction(trans, root);
					goto out;
				}
3566

3567 3568
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
3569 3570 3571 3572 3573 3574
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3575 3576 3577 3578

				leaf = path->nodes[0];
				slot = path->slots[0];
				write_extent_buffer(leaf, buf,
Z
Zheng Yan 已提交
3579 3580
					    btrfs_item_ptr_offset(leaf, slot),
					    size);
Y
Yan Zheng 已提交
3581

3582
				extent = btrfs_item_ptr(leaf, slot,
C
Christoph Hellwig 已提交
3583
						struct btrfs_file_extent_item);
3584 3585 3586 3587 3588 3589 3590 3591 3592

				/* 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);
J
Josef Bacik 已提交
3593

3594 3595
				if (disko) {
					inode_add_bytes(inode, datal);
Y
Yan Zheng 已提交
3596
					ret = btrfs_inc_extent_ref(trans, root,
3597 3598
							disko, diskl, 0,
							root->root_key.objectid,
L
Li Zefan 已提交
3599
							btrfs_ino(inode),
3600
							new_key.offset - datao);
3601 3602 3603 3604 3605 3606 3607 3608 3609
					if (ret) {
						btrfs_abort_transaction(trans,
									root,
									ret);
						btrfs_end_transaction(trans,
								      root);
						goto out;

					}
C
Christoph Hellwig 已提交
3610
				}
3611 3612 3613
			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
				u64 skip = 0;
				u64 trim = 0;
3614

3615 3616 3617 3618
				if (off > key.offset) {
					skip = off - key.offset;
					new_key.offset += skip;
				}
C
Chris Mason 已提交
3619

L
Liu Bo 已提交
3620 3621
				if (key.offset + datal > off + len)
					trim = key.offset + datal - (off + len);
C
Chris Mason 已提交
3622

3623 3624
				if (comp && (skip || trim)) {
					ret = -EINVAL;
3625
					btrfs_end_transaction(trans, root);
3626 3627 3628 3629
					goto out;
				}
				size -= skip + trim;
				datal -= skip + trim;
3630

3631 3632 3633 3634 3635 3636
				ret = clone_copy_inline_extent(src, inode,
							       trans, path,
							       &new_key,
							       drop_start,
							       datal,
							       skip, size, buf);
3637
				if (ret) {
3638
					if (ret != -EOPNOTSUPP)
3639
						btrfs_abort_transaction(trans,
3640 3641
									root,
									ret);
3642 3643 3644
					btrfs_end_transaction(trans, root);
					goto out;
				}
3645 3646
				leaf = path->nodes[0];
				slot = path->slots[0];
C
Christoph Hellwig 已提交
3647
			}
3648

3649 3650 3651
			/* If we have an implicit hole (NO_HOLES feature). */
			if (drop_start < new_key.offset)
				clone_update_extent_map(inode, trans,
3652
						NULL, drop_start,
3653 3654
						new_key.offset - drop_start);

3655
			clone_update_extent_map(inode, trans, path, 0, 0);
3656

3657
			btrfs_mark_buffer_dirty(leaf);
3658
			btrfs_release_path(path);
3659

3660 3661
			last_dest_end = ALIGN(new_key.offset + datal,
					      root->sectorsize);
3662 3663
			ret = clone_finish_inode_update(trans, inode,
							last_dest_end,
3664 3665
							destoff, olen,
							no_time_update);
3666
			if (ret)
3667
				goto out;
3668 3669
			if (new_key.offset + datal >= destoff + len)
				break;
3670
		}
3671
		btrfs_release_path(path);
3672
		key.offset = next_key_min_offset;
C
Christoph Hellwig 已提交
3673 3674
	}
	ret = 0;
3675

3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699
	if (last_dest_end < destoff + len) {
		/*
		 * We have an implicit hole (NO_HOLES feature is enabled) that
		 * fully or partially overlaps our cloning range at its end.
		 */
		btrfs_release_path(path);

		/*
		 * 1 - remove extent(s)
		 * 1 - inode update
		 */
		trans = btrfs_start_transaction(root, 2);
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
			goto out;
		}
		ret = btrfs_drop_extents(trans, root, inode,
					 last_dest_end, destoff + len, 1);
		if (ret) {
			if (ret != -EOPNOTSUPP)
				btrfs_abort_transaction(trans, root, ret);
			btrfs_end_transaction(trans, root);
			goto out;
		}
3700 3701
		clone_update_extent_map(inode, trans, NULL, last_dest_end,
					destoff + len - last_dest_end);
3702
		ret = clone_finish_inode_update(trans, inode, destoff + len,
3703
						destoff, olen, no_time_update);
3704 3705
	}

C
Christoph Hellwig 已提交
3706
out:
3707 3708 3709 3710 3711
	btrfs_free_path(path);
	vfree(buf);
	return ret;
}

3712 3713
static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
					u64 off, u64 olen, u64 destoff)
3714
{
A
Al Viro 已提交
3715
	struct inode *inode = file_inode(file);
3716
	struct inode *src = file_inode(file_src);
3717 3718 3719 3720
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;
	u64 len = olen;
	u64 bs = root->fs_info->sb->s_blocksize;
3721
	int same_inode = src == inode;
3722 3723 3724 3725 3726 3727 3728

	/*
	 * 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.
3729 3730 3731
	 *
	 * - split destination inode's inline extents.  The inline extents can
	 *   be either compressed or non-compressed.
3732 3733 3734 3735 3736
	 */

	if (btrfs_root_readonly(root))
		return -EROFS;

3737 3738 3739
	if (file_src->f_path.mnt != file->f_path.mnt ||
	    src->i_sb != inode->i_sb)
		return -EXDEV;
3740 3741 3742 3743

	/* don't make the dst file partly checksummed */
	if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
	    (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3744
		return -EINVAL;
3745 3746

	if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3747
		return -EISDIR;
3748 3749

	if (!same_inode) {
3750
		btrfs_double_inode_lock(src, inode);
3751
	} else {
A
Al Viro 已提交
3752
		inode_lock(src);
3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764
	}

	/* 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;

3765 3766 3767 3768 3769
	if (len == 0) {
		ret = 0;
		goto out_unlock;
	}

3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786
	/* 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;
	}

3787 3788 3789 3790 3791 3792 3793 3794 3795 3796
	/*
	 * Lock the target range too. Right after we replace the file extent
	 * items in the fs tree (which now point to the cloned data), we might
	 * have a worker replace them with extent items relative to a write
	 * operation that was issued before this clone operation (i.e. confront
	 * with inode.c:btrfs_finish_ordered_io).
	 */
	if (same_inode) {
		u64 lock_start = min_t(u64, off, destoff);
		u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
3797

3798 3799
		lock_extent_range(src, lock_start, lock_len);
	} else {
3800
		btrfs_double_extent_lock(src, off, inode, destoff, len);
3801
	}
3802

3803
	ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3804

3805 3806 3807 3808 3809 3810
	if (same_inode) {
		u64 lock_start = min_t(u64, off, destoff);
		u64 lock_end = max_t(u64, off, destoff) + len - 1;

		unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
	} else {
3811
		btrfs_double_extent_unlock(src, off, inode, destoff, len);
3812 3813 3814 3815 3816 3817 3818
	}
	/*
	 * Truncate page cache pages so that future reads will see the cloned
	 * data immediately and not the previous data.
	 */
	truncate_inode_pages_range(&inode->i_data, destoff,
				   PAGE_CACHE_ALIGN(destoff + len) - 1);
C
Christoph Hellwig 已提交
3819
out_unlock:
3820 3821 3822
	if (!same_inode)
		btrfs_double_inode_unlock(src, inode);
	else
A
Al Viro 已提交
3823
		inode_unlock(src);
3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838
	return ret;
}

ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
			      struct file *file_out, loff_t pos_out,
			      size_t len, unsigned int flags)
{
	ssize_t ret;

	ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
	if (ret == 0)
		ret = len;
	return ret;
}

3839 3840
int btrfs_clone_file_range(struct file *src_file, loff_t off,
		struct file *dst_file, loff_t destoff, u64 len)
3841
{
3842
	return btrfs_clone_files(dst_file, src_file, off, len, destoff);
3843 3844
}

C
Christoph Hellwig 已提交
3845 3846 3847 3848 3849 3850
/*
 * 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.
 */
3851
static long btrfs_ioctl_trans_start(struct file *file)
C
Christoph Hellwig 已提交
3852
{
A
Al Viro 已提交
3853
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
3854 3855
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
3856
	int ret;
C
Christoph Hellwig 已提交
3857

3858
	ret = -EPERM;
3859
	if (!capable(CAP_SYS_ADMIN))
3860
		goto out;
3861

3862 3863
	ret = -EINPROGRESS;
	if (file->private_data)
C
Christoph Hellwig 已提交
3864
		goto out;
3865

L
Li Zefan 已提交
3866 3867 3868 3869
	ret = -EROFS;
	if (btrfs_root_readonly(root))
		goto out;

3870
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
3871 3872 3873
	if (ret)
		goto out;

J
Josef Bacik 已提交
3874
	atomic_inc(&root->fs_info->open_ioctl_trans);
3875

3876
	ret = -ENOMEM;
3877
	trans = btrfs_start_ioctl_transaction(root);
3878
	if (IS_ERR(trans))
3879 3880 3881 3882 3883 3884
		goto out_drop;

	file->private_data = trans;
	return 0;

out_drop:
J
Josef Bacik 已提交
3885
	atomic_dec(&root->fs_info->open_ioctl_trans);
A
Al Viro 已提交
3886
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
3887 3888 3889 3890
out:
	return ret;
}

3891 3892
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
A
Al Viro 已提交
3893
	struct inode *inode = file_inode(file);
3894 3895 3896 3897 3898 3899 3900 3901 3902
	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;
3903
	int ret;
3904 3905 3906 3907

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

3908 3909 3910 3911 3912 3913 3914 3915
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

	if (copy_from_user(&objectid, argp, sizeof(objectid))) {
		ret = -EFAULT;
		goto out;
	}
3916 3917

	if (!objectid)
3918
		objectid = BTRFS_FS_TREE_OBJECTID;
3919 3920 3921 3922 3923 3924

	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);
3925 3926 3927 3928
	if (IS_ERR(new_root)) {
		ret = PTR_ERR(new_root);
		goto out;
	}
3929 3930

	path = btrfs_alloc_path();
3931 3932 3933 3934
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}
3935 3936 3937
	path->leave_spinning = 1;

	trans = btrfs_start_transaction(root, 1);
3938
	if (IS_ERR(trans)) {
3939
		btrfs_free_path(path);
3940 3941
		ret = PTR_ERR(trans);
		goto out;
3942 3943
	}

3944
	dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
3945 3946
	di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
				   dir_id, "default", 7, 1);
3947
	if (IS_ERR_OR_NULL(di)) {
3948 3949
		btrfs_free_path(path);
		btrfs_end_transaction(trans, root);
3950 3951
		btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
			   "item, this isn't going to work");
3952 3953
		ret = -ENOENT;
		goto out;
3954 3955 3956 3957 3958 3959 3960
	}

	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);

3961
	btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
3962
	btrfs_end_transaction(trans, root);
3963 3964 3965
out:
	mnt_drop_write_file(file);
	return ret;
3966 3967
}

3968 3969
void btrfs_get_block_group_info(struct list_head *groups_list,
				struct btrfs_ioctl_space_info *space)
3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983
{
	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);
	}
}

3984
static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
J
Josef Bacik 已提交
3985 3986 3987 3988
{
	struct btrfs_ioctl_space_args space_args;
	struct btrfs_ioctl_space_info space;
	struct btrfs_ioctl_space_info *dest;
3989
	struct btrfs_ioctl_space_info *dest_orig;
3990
	struct btrfs_ioctl_space_info __user *user_dest;
J
Josef Bacik 已提交
3991
	struct btrfs_space_info *info;
3992 3993 3994 3995 3996
	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;
3997
	int alloc_size;
J
Josef Bacik 已提交
3998
	int ret = 0;
3999
	u64 slot_count = 0;
4000
	int i, c;
J
Josef Bacik 已提交
4001 4002 4003 4004 4005 4006

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

4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030
	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);
	}
4031

4032 4033 4034 4035 4036
	/*
	 * Global block reserve, exported as a space_info
	 */
	slot_count++;

4037 4038 4039 4040 4041
	/* space_slots == 0 means they are asking for a count */
	if (space_args.space_slots == 0) {
		space_args.total_spaces = slot_count;
		goto out;
	}
4042

4043
	slot_count = min_t(u64, space_args.space_slots, slot_count);
4044

4045
	alloc_size = sizeof(*dest) * slot_count;
4046

4047 4048 4049 4050 4051 4052
	/* 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
4053
	space_args.total_spaces = 0;
4054
	dest = kmalloc(alloc_size, GFP_KERNEL);
4055 4056 4057
	if (!dest)
		return -ENOMEM;
	dest_orig = dest;
J
Josef Bacik 已提交
4058

4059
	/* now we have a buffer to copy into */
4060 4061 4062
	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

4063 4064 4065
		if (!slot_count)
			break;

4066 4067 4068 4069 4070 4071 4072 4073 4074 4075
		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();
4076

4077 4078 4079 4080 4081
		if (!info)
			continue;
		down_read(&info->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&info->block_groups[c])) {
4082 4083
				btrfs_get_block_group_info(
					&info->block_groups[c], &space);
4084 4085 4086
				memcpy(dest, &space, sizeof(space));
				dest++;
				space_args.total_spaces++;
4087
				slot_count--;
4088
			}
4089 4090
			if (!slot_count)
				break;
4091 4092
		}
		up_read(&info->groups_sem);
J
Josef Bacik 已提交
4093 4094
	}

4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109
	/*
	 * Add global block reserve
	 */
	if (slot_count) {
		struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;

		spin_lock(&block_rsv->lock);
		space.total_bytes = block_rsv->size;
		space.used_bytes = block_rsv->size - block_rsv->reserved;
		spin_unlock(&block_rsv->lock);
		space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
		memcpy(dest, &space, sizeof(space));
		space_args.total_spaces++;
	}

D
Daniel J Blueman 已提交
4110
	user_dest = (struct btrfs_ioctl_space_info __user *)
4111 4112 4113 4114 4115 4116 4117 4118
		(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
4119 4120 4121 4122 4123
		ret = -EFAULT;

	return ret;
}

C
Christoph Hellwig 已提交
4124 4125 4126 4127 4128 4129 4130 4131
/*
 * 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
4132
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
4133 4134 4135 4136
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;

	trans = file->private_data;
4137 4138
	if (!trans)
		return -EINVAL;
C
Christoph Hellwig 已提交
4139
	file->private_data = NULL;
4140

4141 4142
	btrfs_end_transaction(trans, root);

J
Josef Bacik 已提交
4143
	atomic_dec(&root->fs_info->open_ioctl_trans);
4144

A
Al Viro 已提交
4145
	mnt_drop_write_file(file);
4146
	return 0;
C
Christoph Hellwig 已提交
4147 4148
}

4149 4150
static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
					    void __user *argp)
4151 4152 4153
{
	struct btrfs_trans_handle *trans;
	u64 transid;
T
Tsutomu Itoh 已提交
4154
	int ret;
4155

M
Miao Xie 已提交
4156
	trans = btrfs_attach_transaction_barrier(root);
4157 4158 4159 4160 4161 4162 4163 4164
	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;
	}
4165
	transid = trans->transid;
T
Tsutomu Itoh 已提交
4166
	ret = btrfs_commit_transaction_async(trans, root, 0);
4167 4168
	if (ret) {
		btrfs_end_transaction(trans, root);
T
Tsutomu Itoh 已提交
4169
		return ret;
4170
	}
4171
out:
4172 4173 4174 4175 4176 4177
	if (argp)
		if (copy_to_user(argp, &transid, sizeof(transid)))
			return -EFAULT;
	return 0;
}

4178 4179
static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
					   void __user *argp)
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191
{
	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
4192
static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
J
Jan Schmidt 已提交
4193
{
A
Al Viro 已提交
4194
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4195
	struct btrfs_ioctl_scrub_args *sa;
M
Miao Xie 已提交
4196
	int ret;
J
Jan Schmidt 已提交
4197 4198 4199 4200 4201 4202 4203 4204

	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
4205 4206 4207 4208 4209 4210
	if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
		ret = mnt_want_write_file(file);
		if (ret)
			goto out;
	}

4211
	ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4212 4213
			      &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
			      0);
J
Jan Schmidt 已提交
4214 4215 4216 4217

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

M
Miao Xie 已提交
4218 4219 4220
	if (!(sa->flags & BTRFS_SCRUB_READONLY))
		mnt_drop_write_file(file);
out:
J
Jan Schmidt 已提交
4221 4222 4223 4224 4225 4226 4227 4228 4229
	kfree(sa);
	return ret;
}

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

4230
	return btrfs_scrub_cancel(root->fs_info);
J
Jan Schmidt 已提交
4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254
}

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;
}

4255
static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4256
				      void __user *arg)
4257 4258 4259 4260 4261 4262 4263 4264
{
	struct btrfs_ioctl_get_dev_stats *sa;
	int ret;

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

4265 4266 4267 4268 4269 4270
	if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
		kfree(sa);
		return -EPERM;
	}

	ret = btrfs_get_dev_stats(root, sa);
4271 4272 4273 4274 4275 4276 4277 4278

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

	kfree(sa);
	return ret;
}

4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292
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:
4293 4294 4295 4296
		if (root->fs_info->sb->s_flags & MS_RDONLY) {
			ret = -EROFS;
			goto out;
		}
4297 4298 4299
		if (atomic_xchg(
			&root->fs_info->mutually_exclusive_operation_running,
			1)) {
4300
			ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321
		} 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;
4322
out:
4323 4324 4325 4326
	kfree(p);
	return ret;
}

4327 4328 4329 4330
static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
{
	int ret = 0;
	int i;
4331
	u64 rel_ptr;
4332
	int size;
4333
	struct btrfs_ioctl_ino_path_args *ipa = NULL;
4334 4335 4336
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_path *path;

4337
	if (!capable(CAP_DAC_READ_SEARCH))
4338 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
		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) {
4366 4367
		rel_ptr = ipath->fspath->val[i] -
			  (u64)(unsigned long)ipath->fspath->val;
4368
		ipath->fspath->val[i] = rel_ptr;
4369 4370
	}

4371 4372
	ret = copy_to_user((void *)(unsigned long)ipa->fspath,
			   (void *)(unsigned long)ipath->fspath, size);
4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
	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;
	}

4431
	size = min_t(u32, loi->size, SZ_64K);
4432 4433 4434 4435 4436 4437 4438
	inodes = init_data_container(size);
	if (IS_ERR(inodes)) {
		ret = PTR_ERR(inodes);
		inodes = NULL;
		goto out;
	}

L
Liu Bo 已提交
4439 4440 4441
	ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
					  build_ino_list, inodes);
	if (ret == -EINVAL)
4442 4443 4444 4445
		ret = -ENOENT;
	if (ret < 0)
		goto out;

4446 4447
	ret = copy_to_user((void *)(unsigned long)loi->inodes,
			   (void *)(unsigned long)inodes, size);
4448 4449 4450 4451 4452
	if (ret)
		ret = -EFAULT;

out:
	btrfs_free_path(path);
4453
	vfree(inodes);
4454 4455 4456 4457 4458
	kfree(loi);

	return ret;
}

4459
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4460 4461 4462 4463 4464 4465
			       struct btrfs_ioctl_balance_args *bargs)
{
	struct btrfs_balance_control *bctl = fs_info->balance_ctl;

	bargs->flags = bctl->flags;

4466 4467 4468 4469
	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;
4470 4471
	if (atomic_read(&fs_info->balance_cancel_req))
		bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4472

4473 4474 4475
	memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
	memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
	memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4476 4477 4478 4479 4480 4481 4482 4483

	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));
	}
4484 4485
}

4486
static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4487
{
A
Al Viro 已提交
4488
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4489 4490 4491
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_ioctl_balance_args *bargs;
	struct btrfs_balance_control *bctl;
4492
	bool need_unlock; /* for mut. excl. ops lock */
4493 4494 4495 4496 4497
	int ret;

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

4498
	ret = mnt_want_write_file(file);
4499 4500 4501
	if (ret)
		return ret;

4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515
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)
	 */
4516
	mutex_lock(&fs_info->balance_mutex);
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
	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);
4544
		ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4545 4546 4547 4548 4549
		goto out;
	}

locked:
	BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4550 4551 4552 4553 4554

	if (arg) {
		bargs = memdup_user(arg, sizeof(*bargs));
		if (IS_ERR(bargs)) {
			ret = PTR_ERR(bargs);
4555
			goto out_unlock;
4556
		}
4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570

		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;
		}
4571 4572 4573 4574
	} else {
		bargs = NULL;
	}

4575
	if (fs_info->balance_ctl) {
4576 4577 4578 4579
		ret = -EINPROGRESS;
		goto out_bargs;
	}

4580
	bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
	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;
4593 4594 4595
	} else {
		/* balance everything - no filters */
		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4596 4597
	}

4598 4599
	if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
		ret = -EINVAL;
4600
		goto out_bctl;
4601 4602
	}

4603
do_balance:
4604
	/*
4605 4606 4607 4608 4609
	 * 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.
4610
	 */
4611 4612 4613
	need_unlock = false;

	ret = btrfs_balance(bctl, bargs);
4614
	bctl = NULL;
4615

4616 4617 4618 4619 4620
	if (arg) {
		if (copy_to_user(arg, bargs, sizeof(*bargs)))
			ret = -EFAULT;
	}

4621 4622
out_bctl:
	kfree(bctl);
4623 4624
out_bargs:
	kfree(bargs);
4625
out_unlock:
4626 4627
	mutex_unlock(&fs_info->balance_mutex);
	mutex_unlock(&fs_info->volume_mutex);
4628 4629 4630
	if (need_unlock)
		atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
out:
4631
	mnt_drop_write_file(file);
4632 4633 4634
	return ret;
}

4635 4636 4637 4638 4639 4640 4641 4642
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);
4643 4644
	case BTRFS_BALANCE_CTL_CANCEL:
		return btrfs_cancel_balance(root->fs_info);
4645 4646 4647 4648 4649
	}

	return -EINVAL;
}

4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665
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;
	}

4666
	bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682
	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;
}

4683
static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4684
{
A
Al Viro 已提交
4685
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4686 4687 4688 4689 4690 4691 4692 4693
	struct btrfs_ioctl_quota_ctl_args *sa;
	struct btrfs_trans_handle *trans = NULL;
	int ret;
	int err;

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

4694 4695 4696
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4697 4698

	sa = memdup_user(arg, sizeof(*sa));
4699 4700 4701 4702
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4703

4704
	down_write(&root->fs_info->subvol_sem);
J
Jan Schmidt 已提交
4705 4706 4707 4708
	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
4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722
	}

	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
4723 4724 4725
	err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
	if (err && !ret)
		ret = err;
A
Arne Jansen 已提交
4726 4727
out:
	kfree(sa);
4728
	up_write(&root->fs_info->subvol_sem);
4729 4730
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4731 4732 4733
	return ret;
}

4734
static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4735
{
A
Al Viro 已提交
4736
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4737 4738 4739 4740 4741 4742 4743 4744
	struct btrfs_ioctl_qgroup_assign_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4745 4746 4747
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4748 4749

	sa = memdup_user(arg, sizeof(*sa));
4750 4751 4752 4753
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769

	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);
	}

4770 4771 4772
	/* update qgroup status and info */
	err = btrfs_run_qgroups(trans, root->fs_info);
	if (err < 0)
4773
		btrfs_std_error(root->fs_info, ret,
4774
			    "failed to update qgroup status and info\n");
A
Arne Jansen 已提交
4775 4776 4777 4778 4779 4780
	err = btrfs_end_transaction(trans, root);
	if (err && !ret)
		ret = err;

out:
	kfree(sa);
4781 4782
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4783 4784 4785
	return ret;
}

4786
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4787
{
A
Al Viro 已提交
4788
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4789 4790 4791 4792 4793 4794 4795 4796
	struct btrfs_ioctl_qgroup_create_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4797 4798 4799
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4800 4801

	sa = memdup_user(arg, sizeof(*sa));
4802 4803 4804 4805
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4806

M
Miao Xie 已提交
4807 4808 4809 4810 4811
	if (!sa->qgroupid) {
		ret = -EINVAL;
		goto out;
	}

A
Arne Jansen 已提交
4812 4813 4814 4815 4816 4817 4818 4819
	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) {
4820
		ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid);
A
Arne Jansen 已提交
4821 4822 4823 4824 4825 4826 4827 4828 4829 4830
	} 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);
4831 4832
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4833 4834 4835
	return ret;
}

4836
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4837
{
A
Al Viro 已提交
4838
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4839 4840 4841 4842 4843 4844 4845 4846 4847
	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;

4848 4849 4850
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4851 4852

	sa = memdup_user(arg, sizeof(*sa));
4853 4854 4855 4856
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878

	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);
4879 4880
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4881 4882 4883
	return ret;
}

J
Jan Schmidt 已提交
4884 4885
static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4886
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918
	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
4919
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4920 4921 4922 4923 4924 4925
	struct btrfs_ioctl_quota_rescan_args *qsa;
	int ret = 0;

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

4926
	qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
J
Jan Schmidt 已提交
4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941
	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;
}

4942 4943
static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4944
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4945 4946 4947 4948 4949 4950 4951

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

	return btrfs_qgroup_wait_for_completion(root->fs_info);
}

4952 4953
static long _btrfs_ioctl_set_received_subvol(struct file *file,
					    struct btrfs_ioctl_received_subvol_args *sa)
4954
{
A
Al Viro 已提交
4955
	struct inode *inode = file_inode(file);
4956 4957 4958 4959 4960
	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;
4961
	int received_uuid_changed;
4962

4963 4964 4965
	if (!inode_owner_or_capable(inode))
		return -EPERM;

4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981
	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;
	}

4982 4983 4984 4985 4986
	/*
	 * 1 - root item
	 * 2 - uuid items (received uuid + subvol uuid)
	 */
	trans = btrfs_start_transaction(root, 3);
4987 4988 4989 4990 4991 4992 4993 4994 4995 4996
	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;

4997 4998 4999 5000 5001 5002 5003 5004
	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);
5005 5006 5007
	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);
5008 5009 5010 5011
	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);
5012 5013 5014 5015 5016 5017

	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;
5018 5019 5020 5021 5022 5023 5024 5025
	}
	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);
5026
			goto out;
5027 5028 5029 5030 5031 5032
		}
	}
	ret = btrfs_commit_transaction(trans, root);
	if (ret < 0) {
		btrfs_abort_transaction(trans, root, ret);
		goto out;
5033 5034
	}

5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055
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;
	}

5056
	args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5057 5058
	if (!args64) {
		ret = -ENOMEM;
5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112
		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;

5113 5114 5115 5116 5117 5118 5119 5120 5121
	ret = copy_to_user(arg, sa, sizeof(*sa));
	if (ret)
		ret = -EFAULT;

out:
	kfree(sa);
	return ret;
}

5122 5123
static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
5124
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5125
	size_t len;
5126
	int ret;
5127 5128 5129 5130 5131 5132 5133
	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);
5134 5135

	if (len == BTRFS_LABEL_SIZE) {
5136 5137
		btrfs_warn(root->fs_info,
			"label is too long, return the first %zu bytes", --len);
5138 5139 5140 5141 5142 5143 5144
	}

	ret = copy_to_user(arg, label, len);

	return ret ? -EFAULT : 0;
}

5145 5146
static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
5147
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159
	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) {
5160
		btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174
		       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;
	}

5175
	spin_lock(&root->fs_info->super_lock);
5176
	strcpy(super_block->label, label);
5177
	spin_unlock(&root->fs_info->super_lock);
5178
	ret = btrfs_commit_transaction(trans, root);
5179 5180 5181 5182 5183 5184

out_unlock:
	mnt_drop_write_file(file);
	return ret;
}

5185 5186 5187 5188 5189
#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 }

5190
int btrfs_ioctl_get_supported_features(struct file *file, void __user *arg)
5191
{
D
David Sterba 已提交
5192
	static const struct btrfs_ioctl_feature_flags features[3] = {
5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219
		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;
}

5220 5221
static int check_feature_bits(struct btrfs_root *root,
			      enum btrfs_feature_set set,
5222 5223 5224
			      u64 change_mask, u64 flags, u64 supported_flags,
			      u64 safe_set, u64 safe_clear)
{
5225 5226
	const char *type = btrfs_feature_set_names[set];
	char *names;
5227 5228 5229 5230 5231 5232
	u64 disallowed, unsupported;
	u64 set_mask = flags & change_mask;
	u64 clear_mask = ~flags & change_mask;

	unsupported = set_mask & ~supported_flags;
	if (unsupported) {
5233 5234 5235 5236 5237 5238 5239 5240
		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,
5241 5242 5243 5244 5245 5246 5247
			   "this kernel does not support %s bits 0x%llx",
			   type, unsupported);
		return -EOPNOTSUPP;
	}

	disallowed = set_mask & ~safe_set;
	if (disallowed) {
5248 5249 5250 5251 5252 5253 5254 5255
		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,
5256 5257 5258 5259 5260 5261 5262
			   "can't set %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	disallowed = clear_mask & ~safe_clear;
	if (disallowed) {
5263 5264 5265 5266 5267 5268 5269 5270
		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,
5271 5272 5273 5274 5275 5276 5277 5278 5279
			   "can't clear %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	return 0;
}

#define check_feature(root, change_mask, flags, mask_base)	\
5280
check_feature_bits(root, FEAT_##mask_base, change_mask, flags,	\
5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319
		   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;

5320
	trans = btrfs_start_transaction(root, 0);
5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340
	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);

5341
	return btrfs_commit_transaction(trans, root);
5342 5343
}

C
Christoph Hellwig 已提交
5344 5345 5346
long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
{
A
Al Viro 已提交
5347
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5348
	void __user *argp = (void __user *)arg;
C
Christoph Hellwig 已提交
5349 5350

	switch (cmd) {
5351 5352 5353 5354 5355 5356
	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);
5357 5358
	case FITRIM:
		return btrfs_ioctl_fitrim(file, argp);
C
Christoph Hellwig 已提交
5359
	case BTRFS_IOC_SNAP_CREATE:
5360
		return btrfs_ioctl_snap_create(file, argp, 0);
5361
	case BTRFS_IOC_SNAP_CREATE_V2:
5362
		return btrfs_ioctl_snap_create_v2(file, argp, 0);
5363
	case BTRFS_IOC_SUBVOL_CREATE:
5364
		return btrfs_ioctl_snap_create(file, argp, 1);
A
Arne Jansen 已提交
5365 5366
	case BTRFS_IOC_SUBVOL_CREATE_V2:
		return btrfs_ioctl_snap_create_v2(file, argp, 1);
5367 5368
	case BTRFS_IOC_SNAP_DESTROY:
		return btrfs_ioctl_snap_destroy(file, argp);
5369 5370 5371 5372
	case BTRFS_IOC_SUBVOL_GETFLAGS:
		return btrfs_ioctl_subvol_getflags(file, argp);
	case BTRFS_IOC_SUBVOL_SETFLAGS:
		return btrfs_ioctl_subvol_setflags(file, argp);
5373 5374
	case BTRFS_IOC_DEFAULT_SUBVOL:
		return btrfs_ioctl_default_subvol(file, argp);
C
Christoph Hellwig 已提交
5375
	case BTRFS_IOC_DEFRAG:
C
Chris Mason 已提交
5376 5377 5378
		return btrfs_ioctl_defrag(file, NULL);
	case BTRFS_IOC_DEFRAG_RANGE:
		return btrfs_ioctl_defrag(file, argp);
C
Christoph Hellwig 已提交
5379
	case BTRFS_IOC_RESIZE:
5380
		return btrfs_ioctl_resize(file, argp);
C
Christoph Hellwig 已提交
5381
	case BTRFS_IOC_ADD_DEV:
5382
		return btrfs_ioctl_add_dev(root, argp);
C
Christoph Hellwig 已提交
5383
	case BTRFS_IOC_RM_DEV:
5384
		return btrfs_ioctl_rm_dev(file, argp);
J
Jan Schmidt 已提交
5385 5386 5387 5388
	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
5389
	case BTRFS_IOC_BALANCE:
5390
		return btrfs_ioctl_balance(file, NULL);
C
Christoph Hellwig 已提交
5391 5392 5393 5394
	case BTRFS_IOC_TRANS_START:
		return btrfs_ioctl_trans_start(file);
	case BTRFS_IOC_TRANS_END:
		return btrfs_ioctl_trans_end(file);
5395 5396
	case BTRFS_IOC_TREE_SEARCH:
		return btrfs_ioctl_tree_search(file, argp);
G
Gerhard Heift 已提交
5397 5398
	case BTRFS_IOC_TREE_SEARCH_V2:
		return btrfs_ioctl_tree_search_v2(file, argp);
5399 5400
	case BTRFS_IOC_INO_LOOKUP:
		return btrfs_ioctl_ino_lookup(file, argp);
5401 5402 5403 5404
	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
5405 5406
	case BTRFS_IOC_SPACE_INFO:
		return btrfs_ioctl_space_info(root, argp);
5407 5408 5409
	case BTRFS_IOC_SYNC: {
		int ret;

5410
		ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5411 5412
		if (ret)
			return ret;
A
Al Viro 已提交
5413
		ret = btrfs_sync_fs(file_inode(file)->i_sb, 1);
5414 5415 5416 5417 5418 5419
		/*
		 * The transaction thread may want to do more work,
		 * namely it pokes the cleaner ktread that will start
		 * processing uncleaned subvols.
		 */
		wake_up_process(root->fs_info->transaction_kthread);
5420 5421
		return ret;
	}
5422
	case BTRFS_IOC_START_SYNC:
5423
		return btrfs_ioctl_start_sync(root, argp);
5424
	case BTRFS_IOC_WAIT_SYNC:
5425
		return btrfs_ioctl_wait_sync(root, argp);
J
Jan Schmidt 已提交
5426
	case BTRFS_IOC_SCRUB:
M
Miao Xie 已提交
5427
		return btrfs_ioctl_scrub(file, argp);
J
Jan Schmidt 已提交
5428 5429 5430 5431
	case BTRFS_IOC_SCRUB_CANCEL:
		return btrfs_ioctl_scrub_cancel(root, argp);
	case BTRFS_IOC_SCRUB_PROGRESS:
		return btrfs_ioctl_scrub_progress(root, argp);
5432
	case BTRFS_IOC_BALANCE_V2:
5433
		return btrfs_ioctl_balance(file, argp);
5434 5435
	case BTRFS_IOC_BALANCE_CTL:
		return btrfs_ioctl_balance_ctl(root, arg);
5436 5437
	case BTRFS_IOC_BALANCE_PROGRESS:
		return btrfs_ioctl_balance_progress(root, argp);
5438 5439
	case BTRFS_IOC_SET_RECEIVED_SUBVOL:
		return btrfs_ioctl_set_received_subvol(file, argp);
5440 5441 5442 5443
#ifdef CONFIG_64BIT
	case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
		return btrfs_ioctl_set_received_subvol_32(file, argp);
#endif
5444 5445
	case BTRFS_IOC_SEND:
		return btrfs_ioctl_send(file, argp);
5446
	case BTRFS_IOC_GET_DEV_STATS:
5447
		return btrfs_ioctl_get_dev_stats(root, argp);
A
Arne Jansen 已提交
5448
	case BTRFS_IOC_QUOTA_CTL:
5449
		return btrfs_ioctl_quota_ctl(file, argp);
A
Arne Jansen 已提交
5450
	case BTRFS_IOC_QGROUP_ASSIGN:
5451
		return btrfs_ioctl_qgroup_assign(file, argp);
A
Arne Jansen 已提交
5452
	case BTRFS_IOC_QGROUP_CREATE:
5453
		return btrfs_ioctl_qgroup_create(file, argp);
A
Arne Jansen 已提交
5454
	case BTRFS_IOC_QGROUP_LIMIT:
5455
		return btrfs_ioctl_qgroup_limit(file, argp);
J
Jan Schmidt 已提交
5456 5457 5458 5459
	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);
5460 5461
	case BTRFS_IOC_QUOTA_RESCAN_WAIT:
		return btrfs_ioctl_quota_rescan_wait(file, argp);
5462 5463
	case BTRFS_IOC_DEV_REPLACE:
		return btrfs_ioctl_dev_replace(root, argp);
5464 5465
	case BTRFS_IOC_GET_FSLABEL:
		return btrfs_ioctl_get_fslabel(file, argp);
5466 5467
	case BTRFS_IOC_SET_FSLABEL:
		return btrfs_ioctl_set_fslabel(file, argp);
5468 5469 5470 5471 5472 5473
	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
5474 5475 5476 5477
	}

	return -ENOTTY;
}