ioctl.c 135.1 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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#include "tree-log.h"
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#include "compression.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_fs_time(inode->i_sb);
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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)
409
		return -EINVAL;
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411
	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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}

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static noinline int create_subvol(struct inode *dir,
435
				  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_fs_time(dir->i_sb);
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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;
C
Christoph Hellwig 已提交
551 552 553 554 555
	ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
				&root_item);
	if (ret)
		goto fail;

556 557
	key.offset = (u64)-1;
	new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
558 559
	if (IS_ERR(new_root)) {
		ret = PTR_ERR(new_root);
560
		btrfs_abort_transaction(trans, root, ret);
561 562
		goto fail;
	}
563 564 565

	btrfs_record_root_in_trans(trans, new_root);

566
	ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
567 568
	if (ret) {
		/* We potentially lose an unused inode item here */
569
		btrfs_abort_transaction(trans, root, ret);
570 571 572
		goto fail;
	}

573 574 575 576
	mutex_lock(&new_root->objectid_mutex);
	new_root->highest_objectid = new_dirid;
	mutex_unlock(&new_root->objectid_mutex);

C
Christoph Hellwig 已提交
577 578 579
	/*
	 * insert the directory item
	 */
580
	ret = btrfs_set_inode_index(dir, &index);
581 582 583 584
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
		goto fail;
	}
585 586

	ret = btrfs_insert_dir_item(trans, root,
587
				    name, namelen, dir, &key,
588
				    BTRFS_FT_DIR, index);
589 590
	if (ret) {
		btrfs_abort_transaction(trans, root, ret);
C
Christoph Hellwig 已提交
591
		goto fail;
592
	}
593

594 595 596 597
	btrfs_i_size_write(dir, dir->i_size + namelen * 2);
	ret = btrfs_update_inode(trans, root, dir);
	BUG_ON(ret);

598
	ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
599
				 objectid, root->root_key.objectid,
L
Li Zefan 已提交
600
				 btrfs_ino(dir), index, name, namelen);
601
	BUG_ON(ret);
C
Christoph Hellwig 已提交
602

603 604 605 606 607 608
	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
609
fail:
610 611
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
612 613
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);

S
Sage Weil 已提交
614 615 616
	if (async_transid) {
		*async_transid = trans->transid;
		err = btrfs_commit_transaction_async(trans, root, 1);
617 618
		if (err)
			err = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
619 620 621
	} else {
		err = btrfs_commit_transaction(trans, root);
	}
C
Christoph Hellwig 已提交
622 623
	if (err && !ret)
		ret = err;
624

625 626
	if (!ret) {
		inode = btrfs_lookup_dentry(dir, dentry);
627 628
		if (IS_ERR(inode))
			return PTR_ERR(inode);
629 630
		d_instantiate(dentry, inode);
	}
C
Christoph Hellwig 已提交
631 632 633
	return ret;
}

634
static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
{
	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);
}

651 652 653 654
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
655
{
656
	struct inode *inode;
C
Christoph Hellwig 已提交
657 658
	struct btrfs_pending_snapshot *pending_snapshot;
	struct btrfs_trans_handle *trans;
659
	int ret;
C
Christoph Hellwig 已提交
660

661
	if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
C
Christoph Hellwig 已提交
662 663
		return -EINVAL;

664 665 666 667
	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
	if (!pending_snapshot)
		return -ENOMEM;

668 669
	pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
			GFP_NOFS);
670 671
	pending_snapshot->path = btrfs_alloc_path();
	if (!pending_snapshot->root_item || !pending_snapshot->path) {
672 673 674 675
		ret = -ENOMEM;
		goto free_pending;
	}

676
	atomic_inc(&root->will_be_snapshoted);
677
	smp_mb__after_atomic();
678
	btrfs_wait_for_no_snapshoting_writes(root);
679

680 681
	ret = btrfs_start_delalloc_inodes(root, 0);
	if (ret)
682
		goto dec_and_free;
683

684
	btrfs_wait_ordered_extents(root, -1);
685

686 687
	btrfs_init_block_rsv(&pending_snapshot->block_rsv,
			     BTRFS_BLOCK_RSV_TEMP);
688 689 690 691 692 693
	/*
	 * 1 - parent dir inode
	 * 2 - dir entries
	 * 1 - root item
	 * 2 - root ref/backref
	 * 1 - root of snapshot
694
	 * 1 - UUID item
695 696
	 */
	ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
697
					&pending_snapshot->block_rsv, 8,
698 699
					&pending_snapshot->qgroup_reserved,
					false);
700
	if (ret)
701
		goto dec_and_free;
702

703
	pending_snapshot->dentry = dentry;
C
Christoph Hellwig 已提交
704
	pending_snapshot->root = root;
L
Li Zefan 已提交
705
	pending_snapshot->readonly = readonly;
706
	pending_snapshot->dir = dir;
707
	pending_snapshot->inherit = inherit;
708

709
	trans = btrfs_start_transaction(root, 0);
710 711 712 713 714
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto fail;
	}

715
	spin_lock(&root->fs_info->trans_lock);
C
Christoph Hellwig 已提交
716 717
	list_add(&pending_snapshot->list,
		 &trans->transaction->pending_snapshots);
718
	spin_unlock(&root->fs_info->trans_lock);
S
Sage Weil 已提交
719 720 721 722
	if (async_transid) {
		*async_transid = trans->transid;
		ret = btrfs_commit_transaction_async(trans,
				     root->fs_info->extent_root, 1);
723 724
		if (ret)
			ret = btrfs_commit_transaction(trans, root);
S
Sage Weil 已提交
725 726 727 728
	} else {
		ret = btrfs_commit_transaction(trans,
					       root->fs_info->extent_root);
	}
729
	if (ret)
730
		goto fail;
731 732 733 734 735

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

736 737 738 739
	ret = btrfs_orphan_cleanup(pending_snapshot->snap);
	if (ret)
		goto fail;

740
	inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
741 742 743 744
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto fail;
	}
745

746 747 748
	d_instantiate(dentry, inode);
	ret = 0;
fail:
749 750 751
	btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
					 &pending_snapshot->block_rsv,
					 pending_snapshot->qgroup_reserved);
752
dec_and_free:
753 754
	if (atomic_dec_and_test(&root->will_be_snapshoted))
		wake_up_atomic_t(&root->will_be_snapshoted);
755 756
free_pending:
	kfree(pending_snapshot->root_item);
757
	btrfs_free_path(pending_snapshot->path);
758 759
	kfree(pending_snapshot);

C
Christoph Hellwig 已提交
760 761 762
	return ret;
}

763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
/*  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().
 */

783
static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
784 785 786
{
	int error;

787
	if (d_really_is_negative(victim))
788 789
		return -ENOENT;

790
	BUG_ON(d_inode(victim->d_parent) != dir);
791
	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
792 793 794 795 796 797

	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
	if (error)
		return error;
	if (IS_APPEND(dir))
		return -EPERM;
798 799
	if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
	    IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
800 801
		return -EPERM;
	if (isdir) {
802
		if (!d_is_dir(victim))
803 804 805
			return -ENOTDIR;
		if (IS_ROOT(victim))
			return -EBUSY;
806
	} else if (d_is_dir(victim))
807 808 809 810 811 812 813 814
		return -EISDIR;
	if (IS_DEADDIR(dir))
		return -ENOENT;
	if (victim->d_flags & DCACHE_NFSFS_RENAMED)
		return -EBUSY;
	return 0;
}

815 816 817
/* copy of may_create in fs/namei.c() */
static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
{
818
	if (d_really_is_positive(child))
819 820 821 822 823 824 825 826 827 828 829
		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.
 */
830 831
static noinline int btrfs_mksubvol(struct path *parent,
				   char *name, int namelen,
S
Sage Weil 已提交
832
				   struct btrfs_root *snap_src,
A
Arne Jansen 已提交
833
				   u64 *async_transid, bool readonly,
834
				   struct btrfs_qgroup_inherit *inherit)
835
{
836
	struct inode *dir  = d_inode(parent->dentry);
837 838 839
	struct dentry *dentry;
	int error;

840 841 842
	error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (error == -EINTR)
		return error;
843 844 845 846 847 848

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

849
	error = btrfs_may_create(dir, dentry);
850
	if (error)
851
		goto out_dput;
852

C
Chris Mason 已提交
853 854 855 856 857 858 859 860 861 862
	/*
	 * 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;

863 864 865 866 867
	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;

868
	if (snap_src) {
869
		error = create_snapshot(snap_src, dir, dentry, name, namelen,
A
Arne Jansen 已提交
870
					async_transid, readonly, inherit);
871
	} else {
872 873
		error = create_subvol(dir, dentry, name, namelen,
				      async_transid, inherit);
874
	}
875 876 877 878
	if (!error)
		fsnotify_mkdir(dir, dentry);
out_up_read:
	up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
879 880 881
out_dput:
	dput(dentry);
out_unlock:
A
Al Viro 已提交
882
	inode_unlock(dir);
883 884 885
	return error;
}

C
Chris Mason 已提交
886 887 888 889 890 891 892
/*
 * 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
 */
893
static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
C
Chris Mason 已提交
894 895 896 897 898 899 900
{
	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);
901
	em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
C
Chris Mason 已提交
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
	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,
928
			    u64 *off, u32 thresh)
C
Chris Mason 已提交
929 930 931 932 933 934 935
{
	struct btrfs_path *path;
	struct btrfs_key min_key;
	struct extent_buffer *leaf;
	struct btrfs_file_extent_item *extent;
	int type;
	int ret;
936
	u64 ino = btrfs_ino(inode);
C
Chris Mason 已提交
937 938 939 940 941

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

942
	min_key.objectid = ino;
C
Chris Mason 已提交
943 944 945
	min_key.type = BTRFS_EXTENT_DATA_KEY;
	min_key.offset = *off;

946
	while (1) {
947
		ret = btrfs_search_forward(root, &min_key, path, newer_than);
C
Chris Mason 已提交
948 949
		if (ret != 0)
			goto none;
950
process_slot:
951
		if (min_key.objectid != ino)
C
Chris Mason 已提交
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
			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;
		}

969 970 971 972 973 974
		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
975 976 977 978 979 980 981 982 983 984 985
		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
986
static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
987 988
{
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
L
Li Zefan 已提交
989 990
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
	struct extent_map *em;
991
	u64 len = PAGE_SIZE;
992

L
Li Zefan 已提交
993 994 995 996
	/*
	 * hopefully we have this extent in the tree already, try without
	 * the full extent lock
	 */
997
	read_lock(&em_tree->lock);
L
Li Zefan 已提交
998
	em = lookup_extent_mapping(em_tree, start, len);
999 1000
	read_unlock(&em_tree->lock);

L
Li Zefan 已提交
1001
	if (!em) {
1002 1003 1004
		struct extent_state *cached = NULL;
		u64 end = start + len - 1;

L
Li Zefan 已提交
1005
		/* get the big lock and read metadata off disk */
1006
		lock_extent_bits(io_tree, start, end, &cached);
L
Li Zefan 已提交
1007
		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1008
		unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
L
Li Zefan 已提交
1009 1010 1011 1012 1013 1014 1015

		if (IS_ERR(em))
			return NULL;
	}

	return em;
}
1016

L
Li Zefan 已提交
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
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);
1027 1028 1029
	if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
		ret = false;
	else if ((em->block_start + em->block_len == next->block_start) &&
1030
		 (em->block_len > SZ_128K && next->block_len > SZ_128K))
L
Li Zefan 已提交
1031 1032 1033
		ret = false;

	free_extent_map(next);
1034 1035 1036
	return ret;
}

1037
static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1038 1039
			       u64 *last_len, u64 *skip, u64 *defrag_end,
			       int compress)
1040
{
L
Li Zefan 已提交
1041
	struct extent_map *em;
1042
	int ret = 1;
L
Li Zefan 已提交
1043
	bool next_mergeable = true;
1044
	bool prev_mergeable = true;
1045 1046

	/*
1047
	 * make sure that once we start defragging an extent, we keep on
1048 1049 1050 1051 1052 1053 1054
	 * defragging it
	 */
	if (start < *defrag_end)
		return 1;

	*skip = 0;

L
Li Zefan 已提交
1055 1056 1057
	em = defrag_lookup_extent(inode, start);
	if (!em)
		return 0;
1058 1059

	/* this will cover holes, and inline extents */
1060
	if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1061
		ret = 0;
1062 1063 1064
		goto out;
	}

1065 1066 1067
	if (!*defrag_end)
		prev_mergeable = false;

L
Li Zefan 已提交
1068
	next_mergeable = defrag_check_next_extent(inode, em);
1069
	/*
L
Li Zefan 已提交
1070 1071
	 * we hit a real extent, if it is big or the next extent is not a
	 * real extent, don't bother defragging it
1072
	 */
1073
	if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1074
	    (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1075
		ret = 0;
1076
out:
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	/*
	 * 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
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
/*
 * 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,
1112
				    unsigned long num_pages)
C
Christoph Hellwig 已提交
1113
{
C
Chris Mason 已提交
1114 1115 1116 1117
	unsigned long file_end;
	u64 isize = i_size_read(inode);
	u64 page_start;
	u64 page_end;
1118
	u64 page_cnt;
C
Chris Mason 已提交
1119 1120 1121
	int ret;
	int i;
	int i_done;
1122
	struct btrfs_ordered_extent *ordered;
C
Chris Mason 已提交
1123
	struct extent_state *cached_state = NULL;
1124
	struct extent_io_tree *tree;
1125
	gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
C
Chris Mason 已提交
1126

1127
	file_end = (isize - 1) >> PAGE_SHIFT;
1128 1129 1130 1131
	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
1132 1133

	ret = btrfs_delalloc_reserve_space(inode,
1134 1135
			start_index << PAGE_SHIFT,
			page_cnt << PAGE_SHIFT);
C
Chris Mason 已提交
1136 1137 1138
	if (ret)
		return ret;
	i_done = 0;
1139
	tree = &BTRFS_I(inode)->io_tree;
C
Chris Mason 已提交
1140 1141

	/* step one, lock all the pages */
1142
	for (i = 0; i < page_cnt; i++) {
C
Chris Mason 已提交
1143
		struct page *page;
1144
again:
1145
		page = find_or_create_page(inode->i_mapping,
1146
					   start_index + i, mask);
C
Chris Mason 已提交
1147 1148 1149
		if (!page)
			break;

1150
		page_start = page_offset(page);
1151
		page_end = page_start + PAGE_SIZE - 1;
1152
		while (1) {
1153
			lock_extent_bits(tree, page_start, page_end,
1154
					 &cached_state);
1155 1156
			ordered = btrfs_lookup_ordered_extent(inode,
							      page_start);
1157 1158
			unlock_extent_cached(tree, page_start, page_end,
					     &cached_state, GFP_NOFS);
1159 1160 1161 1162 1163 1164 1165
			if (!ordered)
				break;

			unlock_page(page);
			btrfs_start_ordered_extent(inode, ordered, 1);
			btrfs_put_ordered_extent(ordered);
			lock_page(page);
1166 1167 1168 1169 1170 1171
			/*
			 * we unlocked the page above, so we need check if
			 * it was released or not.
			 */
			if (page->mapping != inode->i_mapping) {
				unlock_page(page);
1172
				put_page(page);
1173 1174
				goto again;
			}
1175 1176
		}

C
Chris Mason 已提交
1177 1178 1179 1180 1181
		if (!PageUptodate(page)) {
			btrfs_readpage(NULL, page);
			lock_page(page);
			if (!PageUptodate(page)) {
				unlock_page(page);
1182
				put_page(page);
C
Chris Mason 已提交
1183 1184 1185 1186
				ret = -EIO;
				break;
			}
		}
1187 1188 1189

		if (page->mapping != inode->i_mapping) {
			unlock_page(page);
1190
			put_page(page);
1191 1192 1193
			goto again;
		}

C
Chris Mason 已提交
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
		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]);
1211
	page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
C
Chris Mason 已提交
1212 1213

	lock_extent_bits(&BTRFS_I(inode)->io_tree,
1214
			 page_start, page_end - 1, &cached_state);
C
Chris Mason 已提交
1215 1216
	clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
			  page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1217 1218
			  EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1219

1220
	if (i_done != page_cnt) {
1221 1222 1223
		spin_lock(&BTRFS_I(inode)->lock);
		BTRFS_I(inode)->outstanding_extents++;
		spin_unlock(&BTRFS_I(inode)->lock);
C
Chris Mason 已提交
1224
		btrfs_delalloc_release_space(inode,
1225 1226
				start_index << PAGE_SHIFT,
				(page_cnt - i_done) << PAGE_SHIFT);
C
Chris Mason 已提交
1227 1228 1229
	}


1230 1231
	set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
			  &cached_state, GFP_NOFS);
C
Chris Mason 已提交
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242

	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]);
1243
		put_page(pages[i]);
C
Chris Mason 已提交
1244 1245 1246 1247 1248
	}
	return i_done;
out:
	for (i = 0; i < i_done; i++) {
		unlock_page(pages[i]);
1249
		put_page(pages[i]);
C
Chris Mason 已提交
1250
	}
1251
	btrfs_delalloc_release_space(inode,
1252 1253
			start_index << PAGE_SHIFT,
			page_cnt << PAGE_SHIFT);
C
Chris Mason 已提交
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
	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
1264
	unsigned long last_index;
1265
	u64 isize = i_size_read(inode);
1266 1267 1268
	u64 last_len = 0;
	u64 skip = 0;
	u64 defrag_end = 0;
C
Chris Mason 已提交
1269
	u64 newer_off = range->start;
C
Christoph Hellwig 已提交
1270
	unsigned long i;
1271
	unsigned long ra_index = 0;
C
Christoph Hellwig 已提交
1272
	int ret;
C
Chris Mason 已提交
1273
	int defrag_count = 0;
1274
	int compress_type = BTRFS_COMPRESS_ZLIB;
1275
	u32 extent_thresh = range->extent_thresh;
1276
	unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1277
	unsigned long cluster = max_cluster;
1278
	u64 new_align = ~((u64)SZ_128K - 1);
C
Chris Mason 已提交
1279 1280
	struct page **pages = NULL;

1281 1282 1283 1284 1285
	if (isize == 0)
		return 0;

	if (range->start >= isize)
		return -EINVAL;
1286 1287 1288 1289 1290 1291 1292

	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
1293

1294
	if (extent_thresh == 0)
1295
		extent_thresh = SZ_256K;
1296

C
Chris Mason 已提交
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
	/*
	 * 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;
	}

1310
	pages = kmalloc_array(max_cluster, sizeof(struct page *),
C
Chris Mason 已提交
1311 1312 1313 1314 1315 1316 1317
			GFP_NOFS);
	if (!pages) {
		ret = -ENOMEM;
		goto out_ra;
	}

	/* find the last page to defrag */
C
Chris Mason 已提交
1318
	if (range->start + range->len > range->start) {
1319
		last_index = min_t(u64, isize - 1,
1320
			 range->start + range->len - 1) >> PAGE_SHIFT;
C
Chris Mason 已提交
1321
	} else {
1322
		last_index = (isize - 1) >> PAGE_SHIFT;
C
Chris Mason 已提交
1323 1324
	}

C
Chris Mason 已提交
1325 1326
	if (newer_than) {
		ret = find_new_extents(root, inode, newer_than,
1327
				       &newer_off, SZ_64K);
C
Chris Mason 已提交
1328 1329 1330 1331 1332 1333
		if (!ret) {
			range->start = newer_off;
			/*
			 * we always align our defrag to help keep
			 * the extents in the file evenly spaced
			 */
1334
			i = (newer_off & new_align) >> PAGE_SHIFT;
C
Chris Mason 已提交
1335 1336 1337
		} else
			goto out_ra;
	} else {
1338
		i = range->start >> PAGE_SHIFT;
C
Chris Mason 已提交
1339 1340
	}
	if (!max_to_defrag)
1341
		max_to_defrag = last_index - i + 1;
C
Chris Mason 已提交
1342

L
Li Zefan 已提交
1343 1344 1345 1346 1347 1348 1349
	/*
	 * 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;

1350
	while (i <= last_index && defrag_count < max_to_defrag &&
1351
	       (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
C
Chris Mason 已提交
1352 1353 1354 1355 1356 1357 1358
		/*
		 * make sure we stop running if someone unmounts
		 * the FS
		 */
		if (!(inode->i_sb->s_flags & MS_ACTIVE))
			break;

1359
		if (btrfs_defrag_cancelled(root->fs_info)) {
1360
			btrfs_debug(root->fs_info, "defrag_file cancelled");
1361 1362 1363 1364
			ret = -EAGAIN;
			break;
		}

1365
		if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
L
Li Zefan 已提交
1366
					 extent_thresh, &last_len, &skip,
1367 1368
					 &defrag_end, range->flags &
					 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1369 1370 1371 1372 1373
			unsigned long next;
			/*
			 * the should_defrag function tells us how much to skip
			 * bump our counter by the suggested amount
			 */
1374
			next = DIV_ROUND_UP(skip, PAGE_SIZE);
1375 1376 1377
			i = max(i + 1, next);
			continue;
		}
1378 1379

		if (!newer_than) {
1380 1381
			cluster = (PAGE_ALIGN(defrag_end) >>
				   PAGE_SHIFT) - i;
1382 1383 1384 1385 1386 1387 1388 1389 1390
			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);
1391
			ra_index += cluster;
1392
		}
1393

A
Al Viro 已提交
1394
		inode_lock(inode);
1395 1396
		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
			BTRFS_I(inode)->force_compress = compress_type;
1397
		ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1398
		if (ret < 0) {
A
Al Viro 已提交
1399
			inode_unlock(inode);
C
Chris Mason 已提交
1400
			goto out_ra;
1401
		}
C
Chris Mason 已提交
1402 1403

		defrag_count += ret;
1404
		balance_dirty_pages_ratelimited(inode->i_mapping);
A
Al Viro 已提交
1405
		inode_unlock(inode);
C
Chris Mason 已提交
1406 1407 1408 1409 1410

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

1411 1412 1413
			if (ret > 0)
				i += ret;

C
Chris Mason 已提交
1414
			newer_off = max(newer_off + 1,
1415
					(u64)i << PAGE_SHIFT);
C
Chris Mason 已提交
1416

1417 1418
			ret = find_new_extents(root, inode, newer_than,
					       &newer_off, SZ_64K);
C
Chris Mason 已提交
1419 1420
			if (!ret) {
				range->start = newer_off;
1421
				i = (newer_off & new_align) >> PAGE_SHIFT;
C
Chris Mason 已提交
1422 1423
			} else {
				break;
C
Christoph Hellwig 已提交
1424
			}
C
Chris Mason 已提交
1425
		} else {
1426
			if (ret > 0) {
L
Li Zefan 已提交
1427
				i += ret;
1428
				last_len += ret << PAGE_SHIFT;
1429
			} else {
L
Li Zefan 已提交
1430
				i++;
1431 1432
				last_len = 0;
			}
C
Christoph Hellwig 已提交
1433 1434 1435
		}
	}

1436
	if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
C
Chris Mason 已提交
1437
		filemap_flush(inode->i_mapping);
1438 1439 1440 1441
		if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
			     &BTRFS_I(inode)->runtime_flags))
			filemap_flush(inode->i_mapping);
	}
C
Chris Mason 已提交
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457

	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);
	}

1458
	if (range->compress_type == BTRFS_COMPRESS_LZO) {
1459
		btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1460 1461
	}

1462
	ret = defrag_count;
1463

C
Chris Mason 已提交
1464
out_ra:
1465
	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
A
Al Viro 已提交
1466
		inode_lock(inode);
1467
		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
A
Al Viro 已提交
1468
		inode_unlock(inode);
1469
	}
C
Chris Mason 已提交
1470 1471 1472
	if (!file)
		kfree(ra);
	kfree(pages);
1473
	return ret;
C
Christoph Hellwig 已提交
1474 1475
}

1476
static noinline int btrfs_ioctl_resize(struct file *file,
1477
					void __user *arg)
C
Christoph Hellwig 已提交
1478 1479 1480 1481
{
	u64 new_size;
	u64 old_size;
	u64 devid = 1;
A
Al Viro 已提交
1482
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
1483 1484 1485 1486
	struct btrfs_ioctl_vol_args *vol_args;
	struct btrfs_trans_handle *trans;
	struct btrfs_device *device = NULL;
	char *sizestr;
1487
	char *retptr;
C
Christoph Hellwig 已提交
1488 1489 1490 1491
	char *devstr = NULL;
	int ret = 0;
	int mod = 0;

1492 1493 1494
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

1495 1496 1497 1498
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

1499 1500
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
1501
		mnt_drop_write_file(file);
1502
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1503 1504
	}

1505
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
1506
	vol_args = memdup_user(arg, sizeof(*vol_args));
1507 1508 1509 1510
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
1511 1512

	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
1513 1514 1515 1516 1517 1518 1519

	sizestr = vol_args->name;
	devstr = strchr(sizestr, ':');
	if (devstr) {
		sizestr = devstr + 1;
		*devstr = '\0';
		devstr = vol_args->name;
1520 1521 1522
		ret = kstrtoull(devstr, 10, &devid);
		if (ret)
			goto out_free;
1523 1524 1525 1526
		if (!devid) {
			ret = -EINVAL;
			goto out_free;
		}
1527
		btrfs_info(root->fs_info, "resizing devid %llu", devid);
C
Christoph Hellwig 已提交
1528
	}
M
Miao Xie 已提交
1529

1530
	device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
C
Christoph Hellwig 已提交
1531
	if (!device) {
1532
		btrfs_info(root->fs_info, "resizer unable to find device %llu",
1533
		       devid);
1534
		ret = -ENODEV;
1535
		goto out_free;
C
Christoph Hellwig 已提交
1536
	}
M
Miao Xie 已提交
1537 1538

	if (!device->writeable) {
1539 1540
		btrfs_info(root->fs_info,
			   "resizer unable to apply on readonly device %llu",
1541
		       devid);
1542
		ret = -EPERM;
L
Liu Bo 已提交
1543 1544 1545
		goto out_free;
	}

C
Christoph Hellwig 已提交
1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
	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++;
		}
1556 1557
		new_size = memparse(sizestr, &retptr);
		if (*retptr != '\0' || new_size == 0) {
C
Christoph Hellwig 已提交
1558
			ret = -EINVAL;
1559
			goto out_free;
C
Christoph Hellwig 已提交
1560 1561 1562
		}
	}

1563
	if (device->is_tgtdev_for_dev_replace) {
1564
		ret = -EPERM;
1565 1566 1567
		goto out_free;
	}

1568
	old_size = btrfs_device_get_total_bytes(device);
C
Christoph Hellwig 已提交
1569 1570 1571 1572

	if (mod < 0) {
		if (new_size > old_size) {
			ret = -EINVAL;
1573
			goto out_free;
C
Christoph Hellwig 已提交
1574 1575 1576
		}
		new_size = old_size - new_size;
	} else if (mod > 0) {
1577
		if (new_size > ULLONG_MAX - old_size) {
1578
			ret = -ERANGE;
1579 1580
			goto out_free;
		}
C
Christoph Hellwig 已提交
1581 1582 1583
		new_size = old_size + new_size;
	}

1584
	if (new_size < SZ_256M) {
C
Christoph Hellwig 已提交
1585
		ret = -EINVAL;
1586
		goto out_free;
C
Christoph Hellwig 已提交
1587 1588 1589
	}
	if (new_size > device->bdev->bd_inode->i_size) {
		ret = -EFBIG;
1590
		goto out_free;
C
Christoph Hellwig 已提交
1591 1592
	}

1593
	new_size = div_u64(new_size, root->sectorsize);
C
Christoph Hellwig 已提交
1594 1595
	new_size *= root->sectorsize;

1596
	btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu",
1597
		      rcu_str_deref(device->name), new_size);
C
Christoph Hellwig 已提交
1598 1599

	if (new_size > old_size) {
1600
		trans = btrfs_start_transaction(root, 0);
1601 1602
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
1603
			goto out_free;
1604
		}
C
Christoph Hellwig 已提交
1605 1606
		ret = btrfs_grow_device(trans, device, new_size);
		btrfs_commit_transaction(trans, root);
1607
	} else if (new_size < old_size) {
C
Christoph Hellwig 已提交
1608
		ret = btrfs_shrink_device(device, new_size);
1609
	} /* equal, nothing need to do */
C
Christoph Hellwig 已提交
1610

1611
out_free:
C
Christoph Hellwig 已提交
1612
	kfree(vol_args);
1613 1614
out:
	mutex_unlock(&root->fs_info->volume_mutex);
1615
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1616
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1617 1618 1619
	return ret;
}

S
Sage Weil 已提交
1620
static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
A
Arne Jansen 已提交
1621 1622
				char *name, unsigned long fd, int subvol,
				u64 *transid, bool readonly,
1623
				struct btrfs_qgroup_inherit *inherit)
C
Christoph Hellwig 已提交
1624 1625
{
	int namelen;
1626
	int ret = 0;
C
Christoph Hellwig 已提交
1627

1628 1629 1630 1631
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;

S
Sage Weil 已提交
1632 1633
	namelen = strlen(name);
	if (strchr(name, '/')) {
C
Christoph Hellwig 已提交
1634
		ret = -EINVAL;
1635
		goto out_drop_write;
C
Christoph Hellwig 已提交
1636 1637
	}

1638 1639 1640
	if (name[0] == '.' &&
	   (namelen == 1 || (name[1] == '.' && namelen == 2))) {
		ret = -EEXIST;
1641
		goto out_drop_write;
1642 1643
	}

1644
	if (subvol) {
S
Sage Weil 已提交
1645
		ret = btrfs_mksubvol(&file->f_path, name, namelen,
A
Arne Jansen 已提交
1646
				     NULL, transid, readonly, inherit);
1647
	} else {
1648
		struct fd src = fdget(fd);
1649
		struct inode *src_inode;
1650
		if (!src.file) {
1651
			ret = -EINVAL;
1652
			goto out_drop_write;
1653 1654
		}

A
Al Viro 已提交
1655 1656
		src_inode = file_inode(src.file);
		if (src_inode->i_sb != file_inode(file)->i_sb) {
J
Josef Bacik 已提交
1657
			btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1658
				   "Snapshot src from another FS");
1659
			ret = -EXDEV;
1660 1661 1662 1663 1664 1665
		} else if (!inode_owner_or_capable(src_inode)) {
			/*
			 * Subvolume creation is not restricted, but snapshots
			 * are limited to own subvolumes only
			 */
			ret = -EPERM;
1666 1667 1668 1669
		} else {
			ret = btrfs_mksubvol(&file->f_path, name, namelen,
					     BTRFS_I(src_inode)->root,
					     transid, readonly, inherit);
1670
		}
1671
		fdput(src);
1672
	}
1673 1674
out_drop_write:
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
1675
out:
S
Sage Weil 已提交
1676 1677 1678 1679
	return ret;
}

static noinline int btrfs_ioctl_snap_create(struct file *file,
1680
					    void __user *arg, int subvol)
S
Sage Weil 已提交
1681
{
1682
	struct btrfs_ioctl_vol_args *vol_args;
S
Sage Weil 已提交
1683 1684
	int ret;

1685 1686 1687 1688
	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
1689

1690
	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
L
Li Zefan 已提交
1691
					      vol_args->fd, subvol,
A
Arne Jansen 已提交
1692
					      NULL, false, NULL);
1693

1694 1695 1696
	kfree(vol_args);
	return ret;
}
1697

1698 1699 1700 1701 1702 1703 1704
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
1705
	bool readonly = false;
A
Arne Jansen 已提交
1706
	struct btrfs_qgroup_inherit *inherit = NULL;
1707

1708 1709 1710 1711
	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';
1712

L
Li Zefan 已提交
1713
	if (vol_args->flags &
A
Arne Jansen 已提交
1714 1715
	    ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
	      BTRFS_SUBVOL_QGROUP_INHERIT)) {
L
Li Zefan 已提交
1716
		ret = -EOPNOTSUPP;
D
Dan Carpenter 已提交
1717
		goto free_args;
S
Sage Weil 已提交
1718
	}
1719 1720 1721

	if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
		ptr = &transid;
L
Li Zefan 已提交
1722 1723
	if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
		readonly = true;
A
Arne Jansen 已提交
1724
	if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1725
		if (vol_args->size > PAGE_SIZE) {
A
Arne Jansen 已提交
1726
			ret = -EINVAL;
D
Dan Carpenter 已提交
1727
			goto free_args;
A
Arne Jansen 已提交
1728 1729 1730 1731
		}
		inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
		if (IS_ERR(inherit)) {
			ret = PTR_ERR(inherit);
D
Dan Carpenter 已提交
1732
			goto free_args;
A
Arne Jansen 已提交
1733 1734
		}
	}
1735 1736

	ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
A
Arne Jansen 已提交
1737
					      vol_args->fd, subvol, ptr,
1738
					      readonly, inherit);
D
Dan Carpenter 已提交
1739 1740
	if (ret)
		goto free_inherit;
1741

D
Dan Carpenter 已提交
1742 1743 1744 1745
	if (ptr && copy_to_user(arg +
				offsetof(struct btrfs_ioctl_vol_args_v2,
					transid),
				ptr, sizeof(*ptr)))
1746
		ret = -EFAULT;
D
Dan Carpenter 已提交
1747 1748

free_inherit:
A
Arne Jansen 已提交
1749
	kfree(inherit);
D
Dan Carpenter 已提交
1750 1751
free_args:
	kfree(vol_args);
C
Christoph Hellwig 已提交
1752 1753 1754
	return ret;
}

1755 1756 1757
static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
						void __user *arg)
{
A
Al Viro 已提交
1758
	struct inode *inode = file_inode(file);
1759 1760 1761 1762
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret = 0;
	u64 flags = 0;

L
Li Zefan 已提交
1763
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
		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
1780
	struct inode *inode = file_inode(file);
1781 1782 1783 1784 1785 1786
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
	u64 root_flags;
	u64 flags;
	int ret = 0;

1787 1788 1789
	if (!inode_owner_or_capable(inode))
		return -EPERM;

1790 1791 1792
	ret = mnt_want_write_file(file);
	if (ret)
		goto out;
1793

1794 1795 1796 1797
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1798

1799 1800 1801 1802
	if (copy_from_user(&flags, arg, sizeof(flags))) {
		ret = -EFAULT;
		goto out_drop_write;
	}
1803

1804 1805 1806 1807
	if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
		ret = -EINVAL;
		goto out_drop_write;
	}
1808

1809 1810 1811 1812
	if (flags & ~BTRFS_SUBVOL_RDONLY) {
		ret = -EOPNOTSUPP;
		goto out_drop_write;
	}
1813 1814 1815 1816 1817

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

	/* nothing to do */
	if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1818
		goto out_drop_sem;
1819 1820

	root_flags = btrfs_root_flags(&root->root_item);
1821
	if (flags & BTRFS_SUBVOL_RDONLY) {
1822 1823
		btrfs_set_root_flags(&root->root_item,
				     root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1824 1825 1826 1827 1828 1829 1830 1831
	} 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,
1832
				     root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
			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;
		}
	}
1843 1844 1845 1846 1847 1848 1849

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

1850
	ret = btrfs_update_root(trans, root->fs_info->tree_root,
1851 1852 1853 1854 1855 1856
				&root->root_key, &root->root_item);

	btrfs_commit_transaction(trans, root);
out_reset:
	if (ret)
		btrfs_set_root_flags(&root->root_item, root_flags);
1857
out_drop_sem:
1858
	up_write(&root->fs_info->subvol_sem);
1859 1860 1861
out_drop_write:
	mnt_drop_write_file(file);
out:
1862 1863 1864
	return ret;
}

1865 1866 1867 1868 1869 1870
/*
 * helper to check if the subvolume references other subvolumes
 */
static noinline int may_destroy_subvol(struct btrfs_root *root)
{
	struct btrfs_path *path;
1871
	struct btrfs_dir_item *di;
1872
	struct btrfs_key key;
1873
	u64 dir_id;
1874 1875 1876 1877 1878 1879
	int ret;

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

1880 1881 1882 1883 1884 1885 1886
	/* 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) {
1887 1888 1889
			ret = -EPERM;
			btrfs_err(root->fs_info, "deleting default subvolume "
				  "%llu is not allowed", key.objectid);
1890 1891 1892 1893 1894
			goto out;
		}
		btrfs_release_path(path);
	}

1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
	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;
}

1918 1919 1920
static noinline int key_in_sk(struct btrfs_key *key,
			      struct btrfs_ioctl_search_key *sk)
{
1921 1922 1923 1924 1925 1926 1927 1928 1929
	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)
1930
		return 0;
1931 1932 1933 1934 1935 1936 1937

	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)
1938 1939 1940 1941 1942 1943 1944 1945
		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,
1946
			       size_t *buf_size,
1947
			       char __user *ubuf,
1948 1949 1950 1951 1952 1953
			       unsigned long *sk_offset,
			       int *num_found)
{
	u64 found_transid;
	struct extent_buffer *leaf;
	struct btrfs_ioctl_search_header sh;
1954
	struct btrfs_key test;
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
	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);

1976 1977 1978 1979
		btrfs_item_key_to_cpu(leaf, key, i);
		if (!key_in_sk(key, sk))
			continue;

1980
		if (sizeof(sh) + item_len > *buf_size) {
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
			if (*num_found) {
				ret = 1;
				goto out;
			}

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

1991
			*buf_size = sizeof(sh) + item_len;
1992
			item_len = 0;
1993 1994
			ret = -EOVERFLOW;
		}
1995

1996
		if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1997
			ret = 1;
1998
			goto out;
1999 2000 2001 2002 2003 2004 2005 2006 2007
		}

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

		/* copy search result header */
2008 2009 2010 2011 2012
		if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
			ret = -EFAULT;
			goto out;
		}

2013 2014 2015
		*sk_offset += sizeof(sh);

		if (item_len) {
2016
			char __user *up = ubuf + *sk_offset;
2017
			/* copy the item */
2018 2019 2020 2021 2022 2023
			if (read_extent_buffer_to_user(leaf, up,
						       item_off, item_len)) {
				ret = -EFAULT;
				goto out;
			}

2024 2025
			*sk_offset += item_len;
		}
2026
		(*num_found)++;
2027

2028 2029 2030
		if (ret) /* -EOVERFLOW from above */
			goto out;

2031 2032 2033 2034
		if (*num_found >= sk->nr_items) {
			ret = 1;
			goto out;
		}
2035 2036
	}
advance_key:
2037
	ret = 0;
2038 2039 2040 2041 2042 2043
	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)
2044
		key->offset++;
2045
	else if (key->type < (u8)-1) {
2046
		key->offset = 0;
2047
		key->type++;
2048
	} else if (key->objectid < (u64)-1) {
2049 2050
		key->offset = 0;
		key->type = 0;
2051
		key->objectid++;
2052 2053
	} else
		ret = 1;
2054
out:
2055 2056 2057 2058 2059 2060 2061 2062 2063
	/*
	 *  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
	 */
2064 2065 2066 2067
	return ret;
}

static noinline int search_ioctl(struct inode *inode,
2068
				 struct btrfs_ioctl_search_key *sk,
2069
				 size_t *buf_size,
2070
				 char __user *ubuf)
2071 2072 2073 2074 2075 2076 2077 2078 2079
{
	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;

2080 2081
	if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
		*buf_size = sizeof(struct btrfs_ioctl_search_header);
2082
		return -EOVERFLOW;
2083
	}
2084

2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
	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)) {
			btrfs_free_path(path);
			return -ENOENT;
		}
	}

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

2107
	while (1) {
2108
		ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2109 2110 2111 2112 2113
		if (ret != 0) {
			if (ret > 0)
				ret = 0;
			goto err;
		}
2114
		ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2115
				 &sk_offset, &num_found);
2116
		btrfs_release_path(path);
2117
		if (ret)
2118 2119 2120
			break;

	}
2121 2122
	if (ret > 0)
		ret = 0;
2123 2124 2125 2126 2127 2128 2129 2130 2131
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)
{
2132 2133
	struct btrfs_ioctl_search_args __user *uargs;
	struct btrfs_ioctl_search_key sk;
2134 2135 2136
	struct inode *inode;
	int ret;
	size_t buf_size;
2137 2138 2139 2140

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

2141 2142 2143 2144
	uargs = (struct btrfs_ioctl_search_args __user *)argp;

	if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
		return -EFAULT;
2145

2146
	buf_size = sizeof(uargs->buf);
2147

A
Al Viro 已提交
2148
	inode = file_inode(file);
2149
	ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2150 2151 2152 2153 2154 2155 2156 2157

	/*
	 * 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;

2158
	if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2159 2160 2161 2162
		ret = -EFAULT;
	return ret;
}

G
Gerhard Heift 已提交
2163 2164 2165 2166 2167 2168 2169 2170
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;
2171
	const size_t buf_limit = SZ_16M;
G
Gerhard Heift 已提交
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198

	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;

2199 2200 2201
	return ret;
}

2202
/*
2203 2204 2205
 * Search INODE_REFs to identify path name of 'dirid' directory
 * in a 'tree_id' tree. and sets path name to 'name'.
 */
2206 2207 2208 2209 2210
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;
2211
	char *ptr;
2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228
	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;

2229
	ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2230 2231 2232 2233 2234 2235

	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)) {
2236
		btrfs_err(info, "could not find root %llu", tree_id);
2237 2238
		ret = -ENOENT;
		goto out;
2239 2240 2241 2242
	}

	key.objectid = dirid;
	key.type = BTRFS_INODE_REF_KEY;
2243
	key.offset = (u64)-1;
2244

2245
	while (1) {
2246 2247 2248
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		if (ret < 0)
			goto out;
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258
		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;
			}
		}
2259 2260 2261 2262 2263 2264 2265 2266 2267

		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;
2268 2269
		if (ptr < name) {
			ret = -ENAMETOOLONG;
2270
			goto out;
2271
		}
2272 2273

		*(ptr + len) = '/';
2274
		read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2275 2276 2277 2278

		if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
			break;

2279
		btrfs_release_path(path);
2280
		key.objectid = key.offset;
2281
		key.offset = (u64)-1;
2282 2283
		dirid = key.objectid;
	}
2284
	memmove(name, ptr, total_len);
2285
	name[total_len] = '\0';
2286 2287 2288
	ret = 0;
out:
	btrfs_free_path(path);
2289 2290 2291 2292 2293 2294 2295 2296
	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;
2297
	int ret = 0;
2298

J
Julia Lawall 已提交
2299 2300 2301
	args = memdup_user(argp, sizeof(*args));
	if (IS_ERR(args))
		return PTR_ERR(args);
2302

A
Al Viro 已提交
2303
	inode = file_inode(file);
2304

2305 2306 2307 2308
	/*
	 * Unprivileged query to obtain the containing subvolume root id. The
	 * path is reset so it's consistent with btrfs_search_path_in_tree.
	 */
2309 2310 2311
	if (args->treeid == 0)
		args->treeid = BTRFS_I(inode)->root->root_key.objectid;

2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
	if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
		args->name[0] = 0;
		goto out;
	}

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

2322 2323 2324 2325
	ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
					args->treeid, args->objectid,
					args->name);

2326
out:
2327 2328 2329 2330
	if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
		ret = -EFAULT;

	kfree(args);
2331 2332 2333
	return ret;
}

2334 2335 2336
static noinline int btrfs_ioctl_snap_destroy(struct file *file,
					     void __user *arg)
{
A
Al Viro 已提交
2337
	struct dentry *parent = file->f_path.dentry;
2338
	struct dentry *dentry;
2339
	struct inode *dir = d_inode(parent);
2340 2341 2342 2343 2344
	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;
2345
	struct btrfs_block_rsv block_rsv;
2346
	u64 root_flags;
2347
	u64 qgroup_reserved;
2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363
	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;
	}

2364
	err = mnt_want_write_file(file);
2365 2366 2367
	if (err)
		goto out;

2368

2369 2370
	err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
	if (err == -EINTR)
2371
		goto out_drop_write;
2372 2373 2374 2375 2376 2377
	dentry = lookup_one_len(vol_args->name, parent, namelen);
	if (IS_ERR(dentry)) {
		err = PTR_ERR(dentry);
		goto out_unlock_dir;
	}

2378
	if (d_really_is_negative(dentry)) {
2379 2380 2381 2382
		err = -ENOENT;
		goto out_dput;
	}

2383
	inode = d_inode(dentry);
2384
	dest = BTRFS_I(inode)->root;
2385
	if (!capable(CAP_SYS_ADMIN)) {
2386 2387 2388 2389 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
		/*
		 * 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;
	}

2419 2420 2421 2422 2423
	/* 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
2424
	if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2425 2426 2427 2428
		err = -EINVAL;
		goto out_dput;
	}

A
Al Viro 已提交
2429
	inode_lock(inode);
2430 2431 2432 2433 2434 2435 2436

	/*
	 * 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);
2437 2438 2439
	root_flags = btrfs_root_flags(&dest->root_item);
	if (dest->send_in_progress == 0) {
		btrfs_set_root_flags(&dest->root_item,
2440 2441 2442 2443 2444 2445
				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",
2446
			dest->root_key.objectid);
2447
		err = -EPERM;
2448
		goto out_unlock_inode;
2449 2450
	}

2451 2452 2453 2454 2455 2456
	down_write(&root->fs_info->subvol_sem);

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

2457 2458 2459 2460 2461 2462
	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,
2463
					       5, &qgroup_reserved, true);
2464 2465 2466
	if (err)
		goto out_up_write;

2467 2468 2469
	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
2470
		goto out_release;
2471
	}
2472 2473
	trans->block_rsv = &block_rsv;
	trans->bytes_reserved = block_rsv.size;
2474

2475 2476
	btrfs_record_snapshot_destroy(trans, dir);

2477 2478 2479 2480
	ret = btrfs_unlink_subvol(trans, root, dir,
				dest->root_key.objectid,
				dentry->d_name.name,
				dentry->d_name.len);
2481 2482 2483 2484 2485
	if (ret) {
		err = ret;
		btrfs_abort_transaction(trans, root, ret);
		goto out_end_trans;
	}
2486 2487 2488 2489 2490 2491 2492 2493

	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);

2494
	if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2495 2496 2497
		ret = btrfs_insert_orphan_item(trans,
					root->fs_info->tree_root,
					dest->root_key.objectid);
2498 2499 2500 2501 2502
		if (ret) {
			btrfs_abort_transaction(trans, root, ret);
			err = ret;
			goto out_end_trans;
		}
2503
	}
2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524

	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;
		}
	}

2525
out_end_trans:
2526 2527
	trans->block_rsv = NULL;
	trans->bytes_reserved = 0;
S
Sage Weil 已提交
2528
	ret = btrfs_end_transaction(trans, root);
2529 2530
	if (ret && !err)
		err = ret;
2531
	inode->i_flags |= S_DEAD;
2532 2533
out_release:
	btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2534 2535
out_up_write:
	up_write(&root->fs_info->subvol_sem);
2536 2537
	if (err) {
		spin_lock(&dest->root_item_lock);
2538 2539
		root_flags = btrfs_root_flags(&dest->root_item);
		btrfs_set_root_flags(&dest->root_item,
2540 2541 2542
				root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
		spin_unlock(&dest->root_item_lock);
	}
2543
out_unlock_inode:
A
Al Viro 已提交
2544
	inode_unlock(inode);
2545
	if (!err) {
2546
		d_invalidate(dentry);
2547 2548
		btrfs_invalidate_inodes(dest);
		d_delete(dentry);
2549
		ASSERT(dest->send_in_progress == 0);
2550 2551

		/* the last ref */
2552 2553 2554
		if (dest->ino_cache_inode) {
			iput(dest->ino_cache_inode);
			dest->ino_cache_inode = NULL;
2555
		}
2556 2557 2558 2559
	}
out_dput:
	dput(dentry);
out_unlock_dir:
A
Al Viro 已提交
2560
	inode_unlock(dir);
2561
out_drop_write:
A
Al Viro 已提交
2562
	mnt_drop_write_file(file);
2563 2564 2565 2566 2567
out:
	kfree(vol_args);
	return err;
}

C
Chris Mason 已提交
2568
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
C
Christoph Hellwig 已提交
2569
{
A
Al Viro 已提交
2570
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
2571
	struct btrfs_root *root = BTRFS_I(inode)->root;
C
Chris Mason 已提交
2572
	struct btrfs_ioctl_defrag_range_args *range;
Y
Yan Zheng 已提交
2573 2574
	int ret;

2575 2576 2577
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
L
Li Zefan 已提交
2578

2579 2580 2581
	if (btrfs_root_readonly(root)) {
		ret = -EROFS;
		goto out;
2582
	}
C
Christoph Hellwig 已提交
2583 2584 2585

	switch (inode->i_mode & S_IFMT) {
	case S_IFDIR:
2586 2587 2588 2589
		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto out;
		}
2590
		ret = btrfs_defrag_root(root);
2591 2592
		if (ret)
			goto out;
2593
		ret = btrfs_defrag_root(root->fs_info->extent_root);
C
Christoph Hellwig 已提交
2594 2595
		break;
	case S_IFREG:
2596 2597 2598 2599
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			goto out;
		}
C
Chris Mason 已提交
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611

		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);
2612
				goto out;
C
Chris Mason 已提交
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622
			}
			/* 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
2623
		ret = btrfs_defrag_file(file_inode(file), file,
C
Chris Mason 已提交
2624 2625 2626
					range, 0, 0);
		if (ret > 0)
			ret = 0;
C
Chris Mason 已提交
2627
		kfree(range);
C
Christoph Hellwig 已提交
2628
		break;
2629 2630
	default:
		ret = -EINVAL;
C
Christoph Hellwig 已提交
2631
	}
2632
out:
2633
	mnt_drop_write_file(file);
2634
	return ret;
C
Christoph Hellwig 已提交
2635 2636
}

2637
static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
C
Christoph Hellwig 已提交
2638 2639 2640 2641
{
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2642 2643 2644
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2645 2646
	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
			1)) {
2647
		return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2648 2649
	}

2650
	mutex_lock(&root->fs_info->volume_mutex);
L
Li Zefan 已提交
2651
	vol_args = memdup_user(arg, sizeof(*vol_args));
2652 2653 2654 2655
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
		goto out;
	}
C
Christoph Hellwig 已提交
2656

2657
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2658 2659
	ret = btrfs_init_new_device(root, vol_args->name);

A
Anand Jain 已提交
2660 2661 2662
	if (!ret)
		btrfs_info(root->fs_info, "disk added %s",vol_args->name);

C
Christoph Hellwig 已提交
2663
	kfree(vol_args);
2664 2665
out:
	mutex_unlock(&root->fs_info->volume_mutex);
2666
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
C
Christoph Hellwig 已提交
2667 2668 2669
	return ret;
}

2670
static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
C
Christoph Hellwig 已提交
2671
{
A
Al Viro 已提交
2672
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
C
Christoph Hellwig 已提交
2673 2674 2675
	struct btrfs_ioctl_vol_args *vol_args;
	int ret;

2676 2677 2678
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

2679 2680 2681
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
Y
Yan Zheng 已提交
2682

L
Li Zefan 已提交
2683
	vol_args = memdup_user(arg, sizeof(*vol_args));
2684 2685
	if (IS_ERR(vol_args)) {
		ret = PTR_ERR(vol_args);
D
Dan Carpenter 已提交
2686
		goto err_drop;
2687
	}
C
Christoph Hellwig 已提交
2688

2689
	vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
C
Christoph Hellwig 已提交
2690

2691 2692 2693 2694 2695 2696 2697 2698
	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);
2699
	mutex_unlock(&root->fs_info->volume_mutex);
2700
	atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2701

2702 2703 2704
	if (!ret)
		btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);

2705 2706
out:
	kfree(vol_args);
D
Dan Carpenter 已提交
2707
err_drop:
2708
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
2709 2710 2711
	return ret;
}

J
Jan Schmidt 已提交
2712 2713
static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
{
2714
	struct btrfs_ioctl_fs_info_args *fi_args;
J
Jan Schmidt 已提交
2715 2716
	struct btrfs_device *device;
	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2717
	int ret = 0;
J
Jan Schmidt 已提交
2718

2719 2720 2721 2722
	fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
	if (!fi_args)
		return -ENOMEM;

2723
	mutex_lock(&fs_devices->device_list_mutex);
2724 2725
	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
2726

2727
	list_for_each_entry(device, &fs_devices->devices, dev_list) {
2728 2729
		if (device->devid > fi_args->max_id)
			fi_args->max_id = device->devid;
J
Jan Schmidt 已提交
2730 2731 2732
	}
	mutex_unlock(&fs_devices->device_list_mutex);

2733 2734 2735 2736
	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;

2737 2738
	if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
		ret = -EFAULT;
J
Jan Schmidt 已提交
2739

2740 2741
	kfree(fi_args);
	return ret;
J
Jan Schmidt 已提交
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755
}

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);

2756
	if (!btrfs_is_empty_uuid(di_args->uuid))
J
Jan Schmidt 已提交
2757 2758 2759
		s_uuid = di_args->uuid;

	mutex_lock(&fs_devices->device_list_mutex);
2760
	dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
J
Jan Schmidt 已提交
2761 2762 2763 2764 2765 2766 2767

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

	di_args->devid = dev->devid;
2768 2769
	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
2770
	memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2771
	if (dev->name) {
2772 2773 2774 2775 2776 2777
		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();
2778 2779
		di_args->path[sizeof(di_args->path) - 1] = 0;
	} else {
2780
		di_args->path[0] = '\0';
2781
	}
J
Jan Schmidt 已提交
2782 2783

out:
2784
	mutex_unlock(&fs_devices->device_list_mutex);
J
Jan Schmidt 已提交
2785 2786 2787 2788 2789 2790 2791
	if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
		ret = -EFAULT;

	kfree(di_args);
	return ret;
}

2792
static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
M
Mark Fasheh 已提交
2793 2794 2795 2796 2797
{
	struct page *page;

	page = grab_cache_page(inode->i_mapping, index);
	if (!page)
2798
		return ERR_PTR(-ENOMEM);
M
Mark Fasheh 已提交
2799 2800

	if (!PageUptodate(page)) {
2801 2802 2803 2804 2805
		int ret;

		ret = btrfs_readpage(NULL, page);
		if (ret)
			return ERR_PTR(ret);
M
Mark Fasheh 已提交
2806 2807 2808
		lock_page(page);
		if (!PageUptodate(page)) {
			unlock_page(page);
2809
			put_page(page);
2810 2811 2812 2813
			return ERR_PTR(-EIO);
		}
		if (page->mapping != inode->i_mapping) {
			unlock_page(page);
2814
			put_page(page);
2815
			return ERR_PTR(-EAGAIN);
M
Mark Fasheh 已提交
2816 2817 2818 2819 2820 2821
		}
	}

	return page;
}

2822 2823 2824 2825
static int gather_extent_pages(struct inode *inode, struct page **pages,
			       int num_pages, u64 off)
{
	int i;
2826
	pgoff_t index = off >> PAGE_SHIFT;
2827 2828

	for (i = 0; i < num_pages; i++) {
2829
again:
2830
		pages[i] = extent_same_get_page(inode, index + i);
2831 2832 2833 2834 2835 2836 2837 2838
		if (IS_ERR(pages[i])) {
			int err = PTR_ERR(pages[i]);

			if (err == -EAGAIN)
				goto again;
			pages[i] = NULL;
			return err;
		}
2839 2840 2841 2842
	}
	return 0;
}

2843 2844
static int lock_extent_range(struct inode *inode, u64 off, u64 len,
			     bool retry_range_locking)
2845
{
2846 2847 2848 2849 2850 2851 2852 2853
	/*
	 * Do any pending delalloc/csum calculations on inode, one way or
	 * another, and lock file content.
	 * The locking order is:
	 *
	 *   1) pages
	 *   2) range in the inode's io tree
	 */
2854 2855 2856 2857 2858
	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);
2859 2860 2861
		if ((!ordered ||
		     ordered->file_offset + ordered->len <= off ||
		     ordered->file_offset >= off + len) &&
2862
		    !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2863 2864 2865
				    off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
			if (ordered)
				btrfs_put_ordered_extent(ordered);
2866
			break;
2867
		}
2868 2869 2870
		unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
		if (ordered)
			btrfs_put_ordered_extent(ordered);
2871 2872
		if (!retry_range_locking)
			return -EAGAIN;
2873 2874
		btrfs_wait_ordered_range(inode, off, len);
	}
2875
	return 0;
2876 2877
}

2878
static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
M
Mark Fasheh 已提交
2879
{
A
Al Viro 已提交
2880 2881
	inode_unlock(inode1);
	inode_unlock(inode2);
M
Mark Fasheh 已提交
2882 2883
}

2884 2885 2886 2887 2888
static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
{
	if (inode1 < inode2)
		swap(inode1, inode2);

A
Al Viro 已提交
2889 2890
	inode_lock_nested(inode1, I_MUTEX_PARENT);
	inode_lock_nested(inode2, I_MUTEX_CHILD);
2891 2892 2893 2894 2895 2896 2897 2898 2899
}

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);
}

2900 2901 2902
static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
				    struct inode *inode2, u64 loff2, u64 len,
				    bool retry_range_locking)
M
Mark Fasheh 已提交
2903
{
2904 2905
	int ret;

M
Mark Fasheh 已提交
2906 2907 2908 2909
	if (inode1 < inode2) {
		swap(inode1, inode2);
		swap(loff1, loff2);
	}
2910 2911 2912 2913 2914 2915 2916 2917
	ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
	if (ret)
		return ret;
	ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
	if (ret)
		unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
			      loff1 + len - 1);
	return ret;
2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932
}

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];
2933 2934
		if (pg) {
			unlock_page(pg);
2935
			put_page(pg);
2936
		}
2937
		pg = cmp->dst_pages[i];
2938 2939
		if (pg) {
			unlock_page(pg);
2940
			put_page(pg);
2941
		}
2942 2943 2944 2945 2946 2947 2948 2949 2950 2951
	}
	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;
2952
	int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT;
2953 2954 2955 2956 2957 2958 2959 2960
	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.
	 */
2961 2962
	src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
	dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
2963 2964 2965 2966
	if (!src_pgarr || !dst_pgarr) {
		kfree(src_pgarr);
		kfree(dst_pgarr);
		return -ENOMEM;
M
Mark Fasheh 已提交
2967
	}
2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
	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
2982 2983 2984
}

static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2985
			  u64 dst_loff, u64 len, struct cmp_pages *cmp)
M
Mark Fasheh 已提交
2986 2987
{
	int ret = 0;
2988
	int i;
M
Mark Fasheh 已提交
2989
	struct page *src_page, *dst_page;
2990
	unsigned int cmp_len = PAGE_SIZE;
M
Mark Fasheh 已提交
2991 2992
	void *addr, *dst_addr;

2993
	i = 0;
M
Mark Fasheh 已提交
2994
	while (len) {
2995
		if (len < PAGE_SIZE)
M
Mark Fasheh 已提交
2996 2997
			cmp_len = len;

2998 2999 3000 3001
		BUG_ON(i >= cmp->num_pages);

		src_page = cmp->src_pages[i];
		dst_page = cmp->dst_pages[i];
3002 3003
		ASSERT(PageLocked(src_page));
		ASSERT(PageLocked(dst_page));
3004

M
Mark Fasheh 已提交
3005 3006 3007 3008 3009 3010 3011
		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))
3012
			ret = -EBADE;
M
Mark Fasheh 已提交
3013 3014 3015 3016 3017 3018 3019 3020

		kunmap_atomic(addr);
		kunmap_atomic(dst_addr);

		if (ret)
			break;

		len -= cmp_len;
3021
		i++;
M
Mark Fasheh 已提交
3022 3023 3024 3025 3026
	}

	return ret;
}

3027 3028
static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
				     u64 olen)
M
Mark Fasheh 已提交
3029
{
3030
	u64 len = *plen;
M
Mark Fasheh 已提交
3031 3032
	u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;

3033
	if (off + olen > inode->i_size || off + olen < off)
M
Mark Fasheh 已提交
3034
		return -EINVAL;
3035 3036 3037 3038 3039

	/* 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
3040 3041 3042 3043 3044 3045 3046
	/* Check that we are block aligned - btrfs_clone() requires this */
	if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
		return -EINVAL;

	return 0;
}

3047
static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
M
Mark Fasheh 已提交
3048 3049 3050
			     struct inode *dst, u64 dst_loff)
{
	int ret;
3051
	u64 len = olen;
3052
	struct cmp_pages cmp;
M
Mark Fasheh 已提交
3053 3054 3055
	int same_inode = 0;
	u64 same_lock_start = 0;
	u64 same_lock_len = 0;
M
Mark Fasheh 已提交
3056 3057

	if (src == dst)
M
Mark Fasheh 已提交
3058
		same_inode = 1;
M
Mark Fasheh 已提交
3059

3060 3061 3062
	if (len == 0)
		return 0;

M
Mark Fasheh 已提交
3063
	if (same_inode) {
A
Al Viro 已提交
3064
		inode_lock(src);
M
Mark Fasheh 已提交
3065

M
Mark Fasheh 已提交
3066
		ret = extent_same_check_offsets(src, loff, &len, olen);
3067 3068 3069
		if (ret)
			goto out_unlock;
		ret = extent_same_check_offsets(src, dst_loff, &len, olen);
M
Mark Fasheh 已提交
3070 3071
		if (ret)
			goto out_unlock;
M
Mark Fasheh 已提交
3072

M
Mark Fasheh 已提交
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110
		/*
		 * 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
3111 3112 3113 3114 3115 3116 3117 3118

	/* 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;
	}

3119
again:
3120 3121 3122 3123
	ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
	if (ret)
		goto out_unlock;

M
Mark Fasheh 已提交
3124
	if (same_inode)
3125 3126
		ret = lock_extent_range(src, same_lock_start, same_lock_len,
					false);
M
Mark Fasheh 已提交
3127
	else
3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
		ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
					       false);
	/*
	 * If one of the inodes has dirty pages in the respective range or
	 * ordered extents, we need to flush dellaloc and wait for all ordered
	 * extents in the range. We must unlock the pages and the ranges in the
	 * io trees to avoid deadlocks when flushing delalloc (requires locking
	 * pages) and when waiting for ordered extents to complete (they require
	 * range locking).
	 */
	if (ret == -EAGAIN) {
		/*
		 * Ranges in the io trees already unlocked. Now unlock all
		 * pages before waiting for all IO to complete.
		 */
		btrfs_cmp_data_free(&cmp);
		if (same_inode) {
			btrfs_wait_ordered_range(src, same_lock_start,
						 same_lock_len);
		} else {
			btrfs_wait_ordered_range(src, loff, len);
			btrfs_wait_ordered_range(dst, dst_loff, len);
		}
		goto again;
	}
	ASSERT(ret == 0);
	if (WARN_ON(ret)) {
		/* ranges in the io trees already unlocked */
		btrfs_cmp_data_free(&cmp);
		return ret;
	}
3159

3160
	/* pass original length for comparison so we stay within i_size */
3161
	ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
M
Mark Fasheh 已提交
3162
	if (ret == 0)
3163
		ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
M
Mark Fasheh 已提交
3164

M
Mark Fasheh 已提交
3165 3166 3167 3168 3169
	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);
3170 3171

	btrfs_cmp_data_free(&cmp);
M
Mark Fasheh 已提交
3172
out_unlock:
M
Mark Fasheh 已提交
3173
	if (same_inode)
A
Al Viro 已提交
3174
		inode_unlock(src);
M
Mark Fasheh 已提交
3175 3176
	else
		btrfs_double_inode_unlock(src, dst);
M
Mark Fasheh 已提交
3177 3178 3179 3180

	return ret;
}

3181
#define BTRFS_MAX_DEDUPE_LEN	SZ_16M
M
Mark Fasheh 已提交
3182

3183 3184
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
3185
{
3186 3187
	struct inode *src = file_inode(src_file);
	struct inode *dst = file_inode(dst_file);
M
Mark Fasheh 已提交
3188
	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3189
	ssize_t res;
M
Mark Fasheh 已提交
3190

3191 3192
	if (olen > BTRFS_MAX_DEDUPE_LEN)
		olen = BTRFS_MAX_DEDUPE_LEN;
M
Mark Fasheh 已提交
3193

3194
	if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
M
Mark Fasheh 已提交
3195 3196 3197 3198 3199
		/*
		 * Btrfs does not support blocksize < page_size. As a
		 * result, btrfs_cmp_data() won't correctly handle
		 * this situation without an update.
		 */
3200
		return -EINVAL;
M
Mark Fasheh 已提交
3201 3202
	}

3203 3204 3205 3206
	res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
	if (res)
		return res;
	return olen;
M
Mark Fasheh 已提交
3207 3208
}

3209 3210 3211 3212
static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
				     struct inode *inode,
				     u64 endoff,
				     const u64 destoff,
3213 3214
				     const u64 olen,
				     int no_time_update)
3215 3216 3217 3218 3219
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;

	inode_inc_iversion(inode);
3220
	if (!no_time_update)
3221
		inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
	/*
	 * 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;
}

3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258
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;
	}

3259 3260 3261 3262 3263
	if (path) {
		struct btrfs_file_extent_item *fi;

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

3294
	if (ret)
3295 3296 3297 3298
		set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
			&BTRFS_I(inode)->runtime_flags);
}

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 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442
/*
 * 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;
}

3443 3444 3445 3446 3447 3448 3449
/**
 * 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
3450
 * @olen_aligned: Block-aligned value of olen
3451
 * @destoff: Offset within @inode to start clone
3452
 * @no_time_update: Whether to update mtime/ctime on the target inode
3453 3454
 */
static int btrfs_clone(struct inode *src, struct inode *inode,
3455
		       const u64 off, const u64 olen, const u64 olen_aligned,
3456
		       const u64 destoff, int no_time_update)
C
Christoph Hellwig 已提交
3457 3458
{
	struct btrfs_root *root = BTRFS_I(inode)->root;
3459
	struct btrfs_path *path = NULL;
C
Christoph Hellwig 已提交
3460
	struct extent_buffer *leaf;
3461 3462
	struct btrfs_trans_handle *trans;
	char *buf = NULL;
Y
Yan Zheng 已提交
3463
	struct btrfs_key key;
C
Christoph Hellwig 已提交
3464 3465
	u32 nritems;
	int slot;
Y
Yan Zheng 已提交
3466
	int ret;
3467 3468
	const u64 len = olen_aligned;
	u64 last_dest_end = destoff;
Y
Yan Zheng 已提交
3469 3470

	ret = -ENOMEM;
3471
	buf = vmalloc(root->nodesize);
Y
Yan Zheng 已提交
3472
	if (!buf)
3473
		return ret;
Y
Yan Zheng 已提交
3474 3475 3476 3477

	path = btrfs_alloc_path();
	if (!path) {
		vfree(buf);
3478
		return ret;
3479 3480
	}

3481
	path->reada = READA_FORWARD;
3482
	/* clone data */
L
Li Zefan 已提交
3483
	key.objectid = btrfs_ino(src);
Y
Yan Zheng 已提交
3484
	key.type = BTRFS_EXTENT_DATA_KEY;
3485
	key.offset = off;
C
Christoph Hellwig 已提交
3486 3487

	while (1) {
3488
		u64 next_key_min_offset = key.offset + 1;
3489

C
Christoph Hellwig 已提交
3490 3491 3492 3493
		/*
		 * note the key will change type as we walk through the
		 * tree.
		 */
3494
		path->leave_spinning = 1;
3495 3496
		ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
				0, 0);
C
Christoph Hellwig 已提交
3497 3498
		if (ret < 0)
			goto out;
3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509
		/*
		 * 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
3510

Y
Yan Zheng 已提交
3511
		nritems = btrfs_header_nritems(path->nodes[0]);
3512
process_slot:
Y
Yan Zheng 已提交
3513
		if (path->slots[0] >= nritems) {
3514
			ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
C
Christoph Hellwig 已提交
3515 3516 3517 3518
			if (ret < 0)
				goto out;
			if (ret > 0)
				break;
Y
Yan Zheng 已提交
3519
			nritems = btrfs_header_nritems(path->nodes[0]);
C
Christoph Hellwig 已提交
3520 3521 3522 3523
		}
		leaf = path->nodes[0];
		slot = path->slots[0];

Y
Yan Zheng 已提交
3524
		btrfs_item_key_to_cpu(leaf, &key, slot);
3525
		if (key.type > BTRFS_EXTENT_DATA_KEY ||
L
Li Zefan 已提交
3526
		    key.objectid != btrfs_ino(src))
C
Christoph Hellwig 已提交
3527 3528
			break;

3529
		if (key.type == BTRFS_EXTENT_DATA_KEY) {
3530 3531
			struct btrfs_file_extent_item *extent;
			int type;
Z
Zheng Yan 已提交
3532 3533
			u32 size;
			struct btrfs_key new_key;
3534 3535 3536
			u64 disko = 0, diskl = 0;
			u64 datao = 0, datal = 0;
			u8 comp;
3537
			u64 drop_start;
Z
Zheng Yan 已提交
3538

3539 3540 3541 3542
			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);
3543 3544
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
C
Chris Mason 已提交
3545 3546 3547 3548
				disko = btrfs_file_extent_disk_bytenr(leaf,
								      extent);
				diskl = btrfs_file_extent_disk_num_bytes(leaf,
								 extent);
3549
				datao = btrfs_file_extent_offset(leaf, extent);
C
Chris Mason 已提交
3550 3551
				datal = btrfs_file_extent_num_bytes(leaf,
								    extent);
3552 3553 3554 3555 3556
			} 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
3557

3558 3559 3560 3561 3562 3563
			/*
			 * 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) {
3564 3565
				path->slots[0]++;
				goto process_slot;
3566 3567
			} else if (key.offset >= off + len) {
				break;
3568
			}
3569
			next_key_min_offset = key.offset + datal;
3570 3571 3572 3573 3574 3575 3576
			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;
3577

Z
Zheng Yan 已提交
3578
			memcpy(&new_key, &key, sizeof(new_key));
L
Li Zefan 已提交
3579
			new_key.objectid = btrfs_ino(inode);
3580 3581 3582 3583
			if (off <= key.offset)
				new_key.offset = key.offset + destoff - off;
			else
				new_key.offset = destoff;
Z
Zheng Yan 已提交
3584

3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596
			/*
			 * 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;

3597 3598 3599 3600 3601 3602
			/*
			 * 1 - adjusting old extent (we may have to split it)
			 * 1 - add new extent
			 * 1 - inode update
			 */
			trans = btrfs_start_transaction(root, 3);
3603 3604 3605 3606 3607
			if (IS_ERR(trans)) {
				ret = PTR_ERR(trans);
				goto out;
			}

3608 3609
			if (type == BTRFS_FILE_EXTENT_REG ||
			    type == BTRFS_FILE_EXTENT_PREALLOC) {
3610 3611 3612 3613 3614
				/*
				 *    a  | --- range to clone ---|  b
				 * | ------------- extent ------------- |
				 */

3615
				/* subtract range b */
3616 3617 3618
				if (key.offset + datal > off + len)
					datal = off + len - key.offset;

3619
				/* subtract range a */
3620 3621 3622 3623 3624
				if (off > key.offset) {
					datao += off - key.offset;
					datal -= off - key.offset;
				}

J
Josef Bacik 已提交
3625
				ret = btrfs_drop_extents(trans, root, inode,
3626
							 drop_start,
3627
							 new_key.offset + datal,
3628
							 1);
3629
				if (ret) {
3630
					if (ret != -EOPNOTSUPP)
3631 3632
						btrfs_abort_transaction(trans,
								root, ret);
3633 3634 3635
					btrfs_end_transaction(trans, root);
					goto out;
				}
3636

3637 3638
				ret = btrfs_insert_empty_item(trans, root, path,
							      &new_key, size);
3639 3640 3641 3642 3643 3644
				if (ret) {
					btrfs_abort_transaction(trans, root,
								ret);
					btrfs_end_transaction(trans, root);
					goto out;
				}
3645 3646 3647 3648

				leaf = path->nodes[0];
				slot = path->slots[0];
				write_extent_buffer(leaf, buf,
Z
Zheng Yan 已提交
3649 3650
					    btrfs_item_ptr_offset(leaf, slot),
					    size);
Y
Yan Zheng 已提交
3651

3652
				extent = btrfs_item_ptr(leaf, slot,
C
Christoph Hellwig 已提交
3653
						struct btrfs_file_extent_item);
3654 3655 3656 3657 3658 3659 3660 3661 3662

				/* 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
3663

3664 3665
				if (disko) {
					inode_add_bytes(inode, datal);
Y
Yan Zheng 已提交
3666
					ret = btrfs_inc_extent_ref(trans, root,
3667 3668
							disko, diskl, 0,
							root->root_key.objectid,
L
Li Zefan 已提交
3669
							btrfs_ino(inode),
3670
							new_key.offset - datao);
3671 3672 3673 3674 3675 3676 3677 3678 3679
					if (ret) {
						btrfs_abort_transaction(trans,
									root,
									ret);
						btrfs_end_transaction(trans,
								      root);
						goto out;

					}
C
Christoph Hellwig 已提交
3680
				}
3681 3682 3683
			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
				u64 skip = 0;
				u64 trim = 0;
3684

3685 3686 3687 3688
				if (off > key.offset) {
					skip = off - key.offset;
					new_key.offset += skip;
				}
C
Chris Mason 已提交
3689

L
Liu Bo 已提交
3690 3691
				if (key.offset + datal > off + len)
					trim = key.offset + datal - (off + len);
C
Chris Mason 已提交
3692

3693 3694
				if (comp && (skip || trim)) {
					ret = -EINVAL;
3695
					btrfs_end_transaction(trans, root);
3696 3697 3698 3699
					goto out;
				}
				size -= skip + trim;
				datal -= skip + trim;
3700

3701 3702 3703 3704 3705 3706
				ret = clone_copy_inline_extent(src, inode,
							       trans, path,
							       &new_key,
							       drop_start,
							       datal,
							       skip, size, buf);
3707
				if (ret) {
3708
					if (ret != -EOPNOTSUPP)
3709
						btrfs_abort_transaction(trans,
3710 3711
									root,
									ret);
3712 3713 3714
					btrfs_end_transaction(trans, root);
					goto out;
				}
3715 3716
				leaf = path->nodes[0];
				slot = path->slots[0];
C
Christoph Hellwig 已提交
3717
			}
3718

3719 3720 3721
			/* If we have an implicit hole (NO_HOLES feature). */
			if (drop_start < new_key.offset)
				clone_update_extent_map(inode, trans,
3722
						NULL, drop_start,
3723 3724
						new_key.offset - drop_start);

3725
			clone_update_extent_map(inode, trans, path, 0, 0);
3726

3727
			btrfs_mark_buffer_dirty(leaf);
3728
			btrfs_release_path(path);
3729

3730 3731
			last_dest_end = ALIGN(new_key.offset + datal,
					      root->sectorsize);
3732 3733
			ret = clone_finish_inode_update(trans, inode,
							last_dest_end,
3734 3735
							destoff, olen,
							no_time_update);
3736
			if (ret)
3737
				goto out;
3738 3739
			if (new_key.offset + datal >= destoff + len)
				break;
3740
		}
3741
		btrfs_release_path(path);
3742
		key.offset = next_key_min_offset;
C
Christoph Hellwig 已提交
3743 3744
	}
	ret = 0;
3745

3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769
	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;
		}
3770 3771
		clone_update_extent_map(inode, trans, NULL, last_dest_end,
					destoff + len - last_dest_end);
3772
		ret = clone_finish_inode_update(trans, inode, destoff + len,
3773
						destoff, olen, no_time_update);
3774 3775
	}

C
Christoph Hellwig 已提交
3776
out:
3777 3778 3779 3780 3781
	btrfs_free_path(path);
	vfree(buf);
	return ret;
}

3782 3783
static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
					u64 off, u64 olen, u64 destoff)
3784
{
A
Al Viro 已提交
3785
	struct inode *inode = file_inode(file);
3786
	struct inode *src = file_inode(file_src);
3787 3788 3789 3790
	struct btrfs_root *root = BTRFS_I(inode)->root;
	int ret;
	u64 len = olen;
	u64 bs = root->fs_info->sb->s_blocksize;
3791
	int same_inode = src == inode;
3792 3793 3794 3795 3796 3797 3798

	/*
	 * 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.
3799 3800 3801
	 *
	 * - split destination inode's inline extents.  The inline extents can
	 *   be either compressed or non-compressed.
3802 3803 3804 3805 3806
	 */

	if (btrfs_root_readonly(root))
		return -EROFS;

3807 3808 3809
	if (file_src->f_path.mnt != file->f_path.mnt ||
	    src->i_sb != inode->i_sb)
		return -EXDEV;
3810 3811 3812 3813

	/* don't make the dst file partly checksummed */
	if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
	    (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3814
		return -EINVAL;
3815 3816

	if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3817
		return -EISDIR;
3818 3819

	if (!same_inode) {
3820
		btrfs_double_inode_lock(src, inode);
3821
	} else {
A
Al Viro 已提交
3822
		inode_lock(src);
3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834
	}

	/* 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;

3835 3836 3837 3838 3839
	if (len == 0) {
		ret = 0;
		goto out_unlock;
	}

3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856
	/* 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;
	}

3857 3858 3859 3860 3861 3862 3863 3864 3865 3866
	/*
	 * 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;
3867

3868
		ret = lock_extent_range(src, lock_start, lock_len, true);
3869
	} else {
3870 3871 3872 3873 3874 3875 3876
		ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
					       true);
	}
	ASSERT(ret == 0);
	if (WARN_ON(ret)) {
		/* ranges in the io trees already unlocked */
		goto out_unlock;
3877
	}
3878

3879
	ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3880

3881 3882 3883 3884 3885 3886
	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 {
3887
		btrfs_double_extent_unlock(src, off, inode, destoff, len);
3888 3889 3890 3891 3892
	}
	/*
	 * Truncate page cache pages so that future reads will see the cloned
	 * data immediately and not the previous data.
	 */
3893
	truncate_inode_pages_range(&inode->i_data,
3894 3895
				round_down(destoff, PAGE_SIZE),
				round_up(destoff + len, PAGE_SIZE) - 1);
C
Christoph Hellwig 已提交
3896
out_unlock:
3897 3898 3899
	if (!same_inode)
		btrfs_double_inode_unlock(src, inode);
	else
A
Al Viro 已提交
3900
		inode_unlock(src);
3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915
	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;
}

3916 3917
int btrfs_clone_file_range(struct file *src_file, loff_t off,
		struct file *dst_file, loff_t destoff, u64 len)
3918
{
3919
	return btrfs_clone_files(dst_file, src_file, off, len, destoff);
3920 3921
}

C
Christoph Hellwig 已提交
3922 3923 3924 3925 3926 3927
/*
 * 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.
 */
3928
static long btrfs_ioctl_trans_start(struct file *file)
C
Christoph Hellwig 已提交
3929
{
A
Al Viro 已提交
3930
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
3931 3932
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;
3933
	int ret;
C
Christoph Hellwig 已提交
3934

3935
	ret = -EPERM;
3936
	if (!capable(CAP_SYS_ADMIN))
3937
		goto out;
3938

3939 3940
	ret = -EINPROGRESS;
	if (file->private_data)
C
Christoph Hellwig 已提交
3941
		goto out;
3942

L
Li Zefan 已提交
3943 3944 3945 3946
	ret = -EROFS;
	if (btrfs_root_readonly(root))
		goto out;

3947
	ret = mnt_want_write_file(file);
Y
Yan Zheng 已提交
3948 3949 3950
	if (ret)
		goto out;

J
Josef Bacik 已提交
3951
	atomic_inc(&root->fs_info->open_ioctl_trans);
3952

3953
	ret = -ENOMEM;
3954
	trans = btrfs_start_ioctl_transaction(root);
3955
	if (IS_ERR(trans))
3956 3957 3958 3959 3960 3961
		goto out_drop;

	file->private_data = trans;
	return 0;

out_drop:
J
Josef Bacik 已提交
3962
	atomic_dec(&root->fs_info->open_ioctl_trans);
A
Al Viro 已提交
3963
	mnt_drop_write_file(file);
C
Christoph Hellwig 已提交
3964 3965 3966 3967
out:
	return ret;
}

3968 3969
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
A
Al Viro 已提交
3970
	struct inode *inode = file_inode(file);
3971 3972 3973 3974 3975 3976 3977 3978 3979
	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;
3980
	int ret;
3981 3982 3983 3984

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

3985 3986 3987 3988 3989 3990 3991 3992
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;

	if (copy_from_user(&objectid, argp, sizeof(objectid))) {
		ret = -EFAULT;
		goto out;
	}
3993 3994

	if (!objectid)
3995
		objectid = BTRFS_FS_TREE_OBJECTID;
3996 3997 3998 3999 4000 4001

	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);
4002 4003 4004 4005
	if (IS_ERR(new_root)) {
		ret = PTR_ERR(new_root);
		goto out;
	}
4006 4007

	path = btrfs_alloc_path();
4008 4009 4010 4011
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}
4012 4013 4014
	path->leave_spinning = 1;

	trans = btrfs_start_transaction(root, 1);
4015
	if (IS_ERR(trans)) {
4016
		btrfs_free_path(path);
4017 4018
		ret = PTR_ERR(trans);
		goto out;
4019 4020
	}

4021
	dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
4022 4023
	di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
				   dir_id, "default", 7, 1);
4024
	if (IS_ERR_OR_NULL(di)) {
4025 4026
		btrfs_free_path(path);
		btrfs_end_transaction(trans, root);
4027 4028
		btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
			   "item, this isn't going to work");
4029 4030
		ret = -ENOENT;
		goto out;
4031 4032 4033 4034 4035 4036 4037
	}

	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);

4038
	btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
4039
	btrfs_end_transaction(trans, root);
4040 4041 4042
out:
	mnt_drop_write_file(file);
	return ret;
4043 4044
}

4045 4046
void btrfs_get_block_group_info(struct list_head *groups_list,
				struct btrfs_ioctl_space_info *space)
4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060
{
	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);
	}
}

4061
static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
J
Josef Bacik 已提交
4062 4063 4064 4065
{
	struct btrfs_ioctl_space_args space_args;
	struct btrfs_ioctl_space_info space;
	struct btrfs_ioctl_space_info *dest;
4066
	struct btrfs_ioctl_space_info *dest_orig;
4067
	struct btrfs_ioctl_space_info __user *user_dest;
J
Josef Bacik 已提交
4068
	struct btrfs_space_info *info;
4069 4070 4071 4072 4073
	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;
4074
	int alloc_size;
J
Josef Bacik 已提交
4075
	int ret = 0;
4076
	u64 slot_count = 0;
4077
	int i, c;
J
Josef Bacik 已提交
4078 4079 4080 4081 4082 4083

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

4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107
	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);
	}
4108

4109 4110 4111 4112 4113
	/*
	 * Global block reserve, exported as a space_info
	 */
	slot_count++;

4114 4115 4116 4117 4118
	/* space_slots == 0 means they are asking for a count */
	if (space_args.space_slots == 0) {
		space_args.total_spaces = slot_count;
		goto out;
	}
4119

4120
	slot_count = min_t(u64, space_args.space_slots, slot_count);
4121

4122
	alloc_size = sizeof(*dest) * slot_count;
4123

4124 4125 4126
	/* 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
	 */
4127
	if (alloc_size > PAGE_SIZE)
4128 4129
		return -ENOMEM;

J
Josef Bacik 已提交
4130
	space_args.total_spaces = 0;
4131
	dest = kmalloc(alloc_size, GFP_KERNEL);
4132 4133 4134
	if (!dest)
		return -ENOMEM;
	dest_orig = dest;
J
Josef Bacik 已提交
4135

4136
	/* now we have a buffer to copy into */
4137 4138 4139
	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

4140 4141 4142
		if (!slot_count)
			break;

4143 4144 4145 4146 4147 4148 4149 4150 4151 4152
		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();
4153

4154 4155 4156 4157 4158
		if (!info)
			continue;
		down_read(&info->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&info->block_groups[c])) {
4159 4160
				btrfs_get_block_group_info(
					&info->block_groups[c], &space);
4161 4162 4163
				memcpy(dest, &space, sizeof(space));
				dest++;
				space_args.total_spaces++;
4164
				slot_count--;
4165
			}
4166 4167
			if (!slot_count)
				break;
4168 4169
		}
		up_read(&info->groups_sem);
J
Josef Bacik 已提交
4170 4171
	}

4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186
	/*
	 * 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
4187
	user_dest = (struct btrfs_ioctl_space_info __user *)
4188 4189 4190 4191 4192 4193 4194 4195
		(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
4196 4197 4198 4199 4200
		ret = -EFAULT;

	return ret;
}

C
Christoph Hellwig 已提交
4201 4202 4203 4204 4205 4206 4207 4208
/*
 * 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
4209
	struct inode *inode = file_inode(file);
C
Christoph Hellwig 已提交
4210 4211 4212 4213
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_trans_handle *trans;

	trans = file->private_data;
4214 4215
	if (!trans)
		return -EINVAL;
C
Christoph Hellwig 已提交
4216
	file->private_data = NULL;
4217

4218 4219
	btrfs_end_transaction(trans, root);

J
Josef Bacik 已提交
4220
	atomic_dec(&root->fs_info->open_ioctl_trans);
4221

A
Al Viro 已提交
4222
	mnt_drop_write_file(file);
4223
	return 0;
C
Christoph Hellwig 已提交
4224 4225
}

4226 4227
static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
					    void __user *argp)
4228 4229 4230
{
	struct btrfs_trans_handle *trans;
	u64 transid;
T
Tsutomu Itoh 已提交
4231
	int ret;
4232

M
Miao Xie 已提交
4233
	trans = btrfs_attach_transaction_barrier(root);
4234 4235 4236 4237 4238 4239 4240 4241
	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;
	}
4242
	transid = trans->transid;
T
Tsutomu Itoh 已提交
4243
	ret = btrfs_commit_transaction_async(trans, root, 0);
4244 4245
	if (ret) {
		btrfs_end_transaction(trans, root);
T
Tsutomu Itoh 已提交
4246
		return ret;
4247
	}
4248
out:
4249 4250 4251 4252 4253 4254
	if (argp)
		if (copy_to_user(argp, &transid, sizeof(transid)))
			return -EFAULT;
	return 0;
}

4255 4256
static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
					   void __user *argp)
4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268
{
	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
4269
static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
J
Jan Schmidt 已提交
4270
{
A
Al Viro 已提交
4271
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4272
	struct btrfs_ioctl_scrub_args *sa;
M
Miao Xie 已提交
4273
	int ret;
J
Jan Schmidt 已提交
4274 4275 4276 4277 4278 4279 4280 4281

	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
4282 4283 4284 4285 4286 4287
	if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
		ret = mnt_want_write_file(file);
		if (ret)
			goto out;
	}

4288
	ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4289 4290
			      &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
			      0);
J
Jan Schmidt 已提交
4291 4292 4293 4294

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

M
Miao Xie 已提交
4295 4296 4297
	if (!(sa->flags & BTRFS_SCRUB_READONLY))
		mnt_drop_write_file(file);
out:
J
Jan Schmidt 已提交
4298 4299 4300 4301 4302 4303 4304 4305 4306
	kfree(sa);
	return ret;
}

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

4307
	return btrfs_scrub_cancel(root->fs_info);
J
Jan Schmidt 已提交
4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331
}

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;
}

4332
static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4333
				      void __user *arg)
4334 4335 4336 4337 4338 4339 4340 4341
{
	struct btrfs_ioctl_get_dev_stats *sa;
	int ret;

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

4342 4343 4344 4345 4346 4347
	if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
		kfree(sa);
		return -EPERM;
	}

	ret = btrfs_get_dev_stats(root, sa);
4348 4349 4350 4351 4352 4353 4354 4355

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

	kfree(sa);
	return ret;
}

4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369
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:
4370 4371 4372 4373
		if (root->fs_info->sb->s_flags & MS_RDONLY) {
			ret = -EROFS;
			goto out;
		}
4374 4375 4376
		if (atomic_xchg(
			&root->fs_info->mutually_exclusive_operation_running,
			1)) {
4377
			ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398
		} 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;
4399
out:
4400 4401 4402 4403
	kfree(p);
	return ret;
}

4404 4405 4406 4407
static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
{
	int ret = 0;
	int i;
4408
	u64 rel_ptr;
4409
	int size;
4410
	struct btrfs_ioctl_ino_path_args *ipa = NULL;
4411 4412 4413
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_path *path;

4414
	if (!capable(CAP_DAC_READ_SEARCH))
4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442
		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) {
4443 4444
		rel_ptr = ipath->fspath->val[i] -
			  (u64)(unsigned long)ipath->fspath->val;
4445
		ipath->fspath->val[i] = rel_ptr;
4446 4447
	}

4448 4449
	ret = copy_to_user((void *)(unsigned long)ipa->fspath,
			   (void *)(unsigned long)ipath->fspath, size);
4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507
	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;
	}

4508
	size = min_t(u32, loi->size, SZ_64K);
4509 4510 4511 4512 4513 4514 4515
	inodes = init_data_container(size);
	if (IS_ERR(inodes)) {
		ret = PTR_ERR(inodes);
		inodes = NULL;
		goto out;
	}

L
Liu Bo 已提交
4516 4517 4518
	ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
					  build_ino_list, inodes);
	if (ret == -EINVAL)
4519 4520 4521 4522
		ret = -ENOENT;
	if (ret < 0)
		goto out;

4523 4524
	ret = copy_to_user((void *)(unsigned long)loi->inodes,
			   (void *)(unsigned long)inodes, size);
4525 4526 4527 4528 4529
	if (ret)
		ret = -EFAULT;

out:
	btrfs_free_path(path);
4530
	vfree(inodes);
4531 4532 4533 4534 4535
	kfree(loi);

	return ret;
}

4536
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4537 4538 4539 4540 4541 4542
			       struct btrfs_ioctl_balance_args *bargs)
{
	struct btrfs_balance_control *bctl = fs_info->balance_ctl;

	bargs->flags = bctl->flags;

4543 4544 4545 4546
	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;
4547 4548
	if (atomic_read(&fs_info->balance_cancel_req))
		bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4549

4550 4551 4552
	memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
	memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
	memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4553 4554 4555 4556 4557 4558 4559 4560

	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));
	}
4561 4562
}

4563
static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4564
{
A
Al Viro 已提交
4565
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4566 4567 4568
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_ioctl_balance_args *bargs;
	struct btrfs_balance_control *bctl;
4569
	bool need_unlock; /* for mut. excl. ops lock */
4570 4571 4572 4573 4574
	int ret;

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

4575
	ret = mnt_want_write_file(file);
4576 4577 4578
	if (ret)
		return ret;

4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
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)
	 */
4593
	mutex_lock(&fs_info->balance_mutex);
4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620
	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);
4621
		ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4622 4623 4624 4625 4626
		goto out;
	}

locked:
	BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4627 4628 4629 4630 4631

	if (arg) {
		bargs = memdup_user(arg, sizeof(*bargs));
		if (IS_ERR(bargs)) {
			ret = PTR_ERR(bargs);
4632
			goto out_unlock;
4633
		}
4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647

		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;
		}
4648 4649 4650 4651
	} else {
		bargs = NULL;
	}

4652
	if (fs_info->balance_ctl) {
4653 4654 4655 4656
		ret = -EINPROGRESS;
		goto out_bargs;
	}

4657
	bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669
	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;
4670 4671 4672
	} else {
		/* balance everything - no filters */
		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4673 4674
	}

4675 4676
	if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
		ret = -EINVAL;
4677
		goto out_bctl;
4678 4679
	}

4680
do_balance:
4681
	/*
4682 4683 4684 4685 4686
	 * 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.
4687
	 */
4688 4689 4690
	need_unlock = false;

	ret = btrfs_balance(bctl, bargs);
4691
	bctl = NULL;
4692

4693 4694 4695 4696 4697
	if (arg) {
		if (copy_to_user(arg, bargs, sizeof(*bargs)))
			ret = -EFAULT;
	}

4698 4699
out_bctl:
	kfree(bctl);
4700 4701
out_bargs:
	kfree(bargs);
4702
out_unlock:
4703 4704
	mutex_unlock(&fs_info->balance_mutex);
	mutex_unlock(&fs_info->volume_mutex);
4705 4706 4707
	if (need_unlock)
		atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
out:
4708
	mnt_drop_write_file(file);
4709 4710 4711
	return ret;
}

4712 4713 4714 4715 4716 4717 4718 4719
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);
4720 4721
	case BTRFS_BALANCE_CTL_CANCEL:
		return btrfs_cancel_balance(root->fs_info);
4722 4723 4724 4725 4726
	}

	return -EINVAL;
}

4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742
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;
	}

4743
	bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759
	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;
}

4760
static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4761
{
A
Al Viro 已提交
4762
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4763 4764 4765 4766 4767 4768 4769 4770
	struct btrfs_ioctl_quota_ctl_args *sa;
	struct btrfs_trans_handle *trans = NULL;
	int ret;
	int err;

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

4771 4772 4773
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4774 4775

	sa = memdup_user(arg, sizeof(*sa));
4776 4777 4778 4779
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4780

4781
	down_write(&root->fs_info->subvol_sem);
J
Jan Schmidt 已提交
4782 4783 4784 4785
	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
4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799
	}

	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
4800 4801 4802
	err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
	if (err && !ret)
		ret = err;
A
Arne Jansen 已提交
4803 4804
out:
	kfree(sa);
4805
	up_write(&root->fs_info->subvol_sem);
4806 4807
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4808 4809 4810
	return ret;
}

4811
static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4812
{
A
Al Viro 已提交
4813
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4814 4815 4816 4817 4818 4819 4820 4821
	struct btrfs_ioctl_qgroup_assign_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4822 4823 4824
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4825 4826

	sa = memdup_user(arg, sizeof(*sa));
4827 4828 4829 4830
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846

	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);
	}

4847 4848 4849
	/* update qgroup status and info */
	err = btrfs_run_qgroups(trans, root->fs_info);
	if (err < 0)
4850
		btrfs_std_error(root->fs_info, ret,
4851
			    "failed to update qgroup status and info\n");
A
Arne Jansen 已提交
4852 4853 4854 4855 4856 4857
	err = btrfs_end_transaction(trans, root);
	if (err && !ret)
		ret = err;

out:
	kfree(sa);
4858 4859
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4860 4861 4862
	return ret;
}

4863
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4864
{
A
Al Viro 已提交
4865
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4866 4867 4868 4869 4870 4871 4872 4873
	struct btrfs_ioctl_qgroup_create_args *sa;
	struct btrfs_trans_handle *trans;
	int ret;
	int err;

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

4874 4875 4876
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4877 4878

	sa = memdup_user(arg, sizeof(*sa));
4879 4880 4881 4882
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4883

M
Miao Xie 已提交
4884 4885 4886 4887 4888
	if (!sa->qgroupid) {
		ret = -EINVAL;
		goto out;
	}

A
Arne Jansen 已提交
4889 4890 4891 4892 4893 4894 4895 4896
	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) {
4897
		ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid);
A
Arne Jansen 已提交
4898 4899 4900 4901 4902 4903 4904 4905 4906 4907
	} 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);
4908 4909
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4910 4911 4912
	return ret;
}

4913
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
A
Arne Jansen 已提交
4914
{
A
Al Viro 已提交
4915
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
A
Arne Jansen 已提交
4916 4917 4918 4919 4920 4921 4922 4923 4924
	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;

4925 4926 4927
	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
A
Arne Jansen 已提交
4928 4929

	sa = memdup_user(arg, sizeof(*sa));
4930 4931 4932 4933
	if (IS_ERR(sa)) {
		ret = PTR_ERR(sa);
		goto drop_write;
	}
A
Arne Jansen 已提交
4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955

	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);
4956 4957
drop_write:
	mnt_drop_write_file(file);
A
Arne Jansen 已提交
4958 4959 4960
	return ret;
}

J
Jan Schmidt 已提交
4961 4962
static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
{
A
Al Viro 已提交
4963
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995
	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
4996
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
J
Jan Schmidt 已提交
4997 4998 4999 5000 5001 5002
	struct btrfs_ioctl_quota_rescan_args *qsa;
	int ret = 0;

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

5003
	qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
J
Jan Schmidt 已提交
5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018
	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;
}

5019 5020
static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
{
A
Al Viro 已提交
5021
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5022 5023 5024 5025 5026 5027 5028

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

	return btrfs_qgroup_wait_for_completion(root->fs_info);
}

5029 5030
static long _btrfs_ioctl_set_received_subvol(struct file *file,
					    struct btrfs_ioctl_received_subvol_args *sa)
5031
{
A
Al Viro 已提交
5032
	struct inode *inode = file_inode(file);
5033 5034 5035
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_root_item *root_item = &root->root_item;
	struct btrfs_trans_handle *trans;
5036
	struct timespec ct = current_fs_time(inode->i_sb);
5037
	int ret = 0;
5038
	int received_uuid_changed;
5039

5040 5041 5042
	if (!inode_owner_or_capable(inode))
		return -EPERM;

5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058
	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;
	}

5059 5060 5061 5062 5063
	/*
	 * 1 - root item
	 * 2 - uuid items (received uuid + subvol uuid)
	 */
	trans = btrfs_start_transaction(root, 3);
5064 5065 5066 5067 5068 5069 5070 5071 5072 5073
	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;

5074 5075 5076 5077 5078 5079 5080 5081
	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);
5082 5083 5084
	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);
5085 5086 5087 5088
	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);
5089 5090 5091 5092 5093 5094

	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;
5095 5096 5097 5098 5099 5100 5101 5102
	}
	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);
5103
			goto out;
5104 5105 5106 5107 5108 5109
		}
	}
	ret = btrfs_commit_transaction(trans, root);
	if (ret < 0) {
		btrfs_abort_transaction(trans, root, ret);
		goto out;
5110 5111
	}

5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132
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;
	}

5133
	args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5134 5135
	if (!args64) {
		ret = -ENOMEM;
5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189
		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;

5190 5191 5192 5193 5194 5195 5196 5197 5198
	ret = copy_to_user(arg, sa, sizeof(*sa));
	if (ret)
		ret = -EFAULT;

out:
	kfree(sa);
	return ret;
}

5199 5200
static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
5201
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5202
	size_t len;
5203
	int ret;
5204 5205 5206 5207 5208 5209 5210
	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);
5211 5212

	if (len == BTRFS_LABEL_SIZE) {
5213 5214
		btrfs_warn(root->fs_info,
			"label is too long, return the first %zu bytes", --len);
5215 5216 5217 5218 5219 5220 5221
	}

	ret = copy_to_user(arg, label, len);

	return ret ? -EFAULT : 0;
}

5222 5223
static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
{
A
Al Viro 已提交
5224
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236
	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) {
5237
		btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251
		       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;
	}

5252
	spin_lock(&root->fs_info->super_lock);
5253
	strcpy(super_block->label, label);
5254
	spin_unlock(&root->fs_info->super_lock);
5255
	ret = btrfs_commit_transaction(trans, root);
5256 5257 5258 5259 5260 5261

out_unlock:
	mnt_drop_write_file(file);
	return ret;
}

5262 5263 5264 5265 5266
#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 }

5267
int btrfs_ioctl_get_supported_features(void __user *arg)
5268
{
D
David Sterba 已提交
5269
	static const struct btrfs_ioctl_feature_flags features[3] = {
5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296
		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;
}

5297 5298
static int check_feature_bits(struct btrfs_root *root,
			      enum btrfs_feature_set set,
5299 5300 5301
			      u64 change_mask, u64 flags, u64 supported_flags,
			      u64 safe_set, u64 safe_clear)
{
5302 5303
	const char *type = btrfs_feature_set_names[set];
	char *names;
5304 5305 5306 5307 5308 5309
	u64 disallowed, unsupported;
	u64 set_mask = flags & change_mask;
	u64 clear_mask = ~flags & change_mask;

	unsupported = set_mask & ~supported_flags;
	if (unsupported) {
5310 5311 5312 5313 5314 5315 5316 5317
		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,
5318 5319 5320 5321 5322 5323 5324
			   "this kernel does not support %s bits 0x%llx",
			   type, unsupported);
		return -EOPNOTSUPP;
	}

	disallowed = set_mask & ~safe_set;
	if (disallowed) {
5325 5326 5327 5328 5329 5330 5331 5332
		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,
5333 5334 5335 5336 5337 5338 5339
			   "can't set %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	disallowed = clear_mask & ~safe_clear;
	if (disallowed) {
5340 5341 5342 5343 5344 5345 5346 5347
		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,
5348 5349 5350 5351 5352 5353 5354 5355 5356
			   "can't clear %s bits 0x%llx while mounted",
			   type, disallowed);
		return -EPERM;
	}

	return 0;
}

#define check_feature(root, change_mask, flags, mask_base)	\
5357
check_feature_bits(root, FEAT_##mask_base, change_mask, flags,	\
5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396
		   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;

5397
	trans = btrfs_start_transaction(root, 0);
5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417
	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);

5418
	return btrfs_commit_transaction(trans, root);
5419 5420
}

C
Christoph Hellwig 已提交
5421 5422 5423
long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
{
A
Al Viro 已提交
5424
	struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5425
	void __user *argp = (void __user *)arg;
C
Christoph Hellwig 已提交
5426 5427

	switch (cmd) {
5428 5429 5430 5431 5432 5433
	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);
5434 5435
	case FITRIM:
		return btrfs_ioctl_fitrim(file, argp);
C
Christoph Hellwig 已提交
5436
	case BTRFS_IOC_SNAP_CREATE:
5437
		return btrfs_ioctl_snap_create(file, argp, 0);
5438
	case BTRFS_IOC_SNAP_CREATE_V2:
5439
		return btrfs_ioctl_snap_create_v2(file, argp, 0);
5440
	case BTRFS_IOC_SUBVOL_CREATE:
5441
		return btrfs_ioctl_snap_create(file, argp, 1);
A
Arne Jansen 已提交
5442 5443
	case BTRFS_IOC_SUBVOL_CREATE_V2:
		return btrfs_ioctl_snap_create_v2(file, argp, 1);
5444 5445
	case BTRFS_IOC_SNAP_DESTROY:
		return btrfs_ioctl_snap_destroy(file, argp);
5446 5447 5448 5449
	case BTRFS_IOC_SUBVOL_GETFLAGS:
		return btrfs_ioctl_subvol_getflags(file, argp);
	case BTRFS_IOC_SUBVOL_SETFLAGS:
		return btrfs_ioctl_subvol_setflags(file, argp);
5450 5451
	case BTRFS_IOC_DEFAULT_SUBVOL:
		return btrfs_ioctl_default_subvol(file, argp);
C
Christoph Hellwig 已提交
5452
	case BTRFS_IOC_DEFRAG:
C
Chris Mason 已提交
5453 5454 5455
		return btrfs_ioctl_defrag(file, NULL);
	case BTRFS_IOC_DEFRAG_RANGE:
		return btrfs_ioctl_defrag(file, argp);
C
Christoph Hellwig 已提交
5456
	case BTRFS_IOC_RESIZE:
5457
		return btrfs_ioctl_resize(file, argp);
C
Christoph Hellwig 已提交
5458
	case BTRFS_IOC_ADD_DEV:
5459
		return btrfs_ioctl_add_dev(root, argp);
C
Christoph Hellwig 已提交
5460
	case BTRFS_IOC_RM_DEV:
5461
		return btrfs_ioctl_rm_dev(file, argp);
J
Jan Schmidt 已提交
5462 5463 5464 5465
	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
5466
	case BTRFS_IOC_BALANCE:
5467
		return btrfs_ioctl_balance(file, NULL);
C
Christoph Hellwig 已提交
5468 5469 5470 5471
	case BTRFS_IOC_TRANS_START:
		return btrfs_ioctl_trans_start(file);
	case BTRFS_IOC_TRANS_END:
		return btrfs_ioctl_trans_end(file);
5472 5473
	case BTRFS_IOC_TREE_SEARCH:
		return btrfs_ioctl_tree_search(file, argp);
G
Gerhard Heift 已提交
5474 5475
	case BTRFS_IOC_TREE_SEARCH_V2:
		return btrfs_ioctl_tree_search_v2(file, argp);
5476 5477
	case BTRFS_IOC_INO_LOOKUP:
		return btrfs_ioctl_ino_lookup(file, argp);
5478 5479 5480 5481
	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
5482 5483
	case BTRFS_IOC_SPACE_INFO:
		return btrfs_ioctl_space_info(root, argp);
5484 5485 5486
	case BTRFS_IOC_SYNC: {
		int ret;

5487
		ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5488 5489
		if (ret)
			return ret;
A
Al Viro 已提交
5490
		ret = btrfs_sync_fs(file_inode(file)->i_sb, 1);
5491 5492 5493 5494 5495 5496
		/*
		 * 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);
5497 5498
		return ret;
	}
5499
	case BTRFS_IOC_START_SYNC:
5500
		return btrfs_ioctl_start_sync(root, argp);
5501
	case BTRFS_IOC_WAIT_SYNC:
5502
		return btrfs_ioctl_wait_sync(root, argp);
J
Jan Schmidt 已提交
5503
	case BTRFS_IOC_SCRUB:
M
Miao Xie 已提交
5504
		return btrfs_ioctl_scrub(file, argp);
J
Jan Schmidt 已提交
5505 5506 5507 5508
	case BTRFS_IOC_SCRUB_CANCEL:
		return btrfs_ioctl_scrub_cancel(root, argp);
	case BTRFS_IOC_SCRUB_PROGRESS:
		return btrfs_ioctl_scrub_progress(root, argp);
5509
	case BTRFS_IOC_BALANCE_V2:
5510
		return btrfs_ioctl_balance(file, argp);
5511 5512
	case BTRFS_IOC_BALANCE_CTL:
		return btrfs_ioctl_balance_ctl(root, arg);
5513 5514
	case BTRFS_IOC_BALANCE_PROGRESS:
		return btrfs_ioctl_balance_progress(root, argp);
5515 5516
	case BTRFS_IOC_SET_RECEIVED_SUBVOL:
		return btrfs_ioctl_set_received_subvol(file, argp);
5517 5518 5519 5520
#ifdef CONFIG_64BIT
	case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
		return btrfs_ioctl_set_received_subvol_32(file, argp);
#endif
5521 5522
	case BTRFS_IOC_SEND:
		return btrfs_ioctl_send(file, argp);
5523
	case BTRFS_IOC_GET_DEV_STATS:
5524
		return btrfs_ioctl_get_dev_stats(root, argp);
A
Arne Jansen 已提交
5525
	case BTRFS_IOC_QUOTA_CTL:
5526
		return btrfs_ioctl_quota_ctl(file, argp);
A
Arne Jansen 已提交
5527
	case BTRFS_IOC_QGROUP_ASSIGN:
5528
		return btrfs_ioctl_qgroup_assign(file, argp);
A
Arne Jansen 已提交
5529
	case BTRFS_IOC_QGROUP_CREATE:
5530
		return btrfs_ioctl_qgroup_create(file, argp);
A
Arne Jansen 已提交
5531
	case BTRFS_IOC_QGROUP_LIMIT:
5532
		return btrfs_ioctl_qgroup_limit(file, argp);
J
Jan Schmidt 已提交
5533 5534 5535 5536
	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);
5537 5538
	case BTRFS_IOC_QUOTA_RESCAN_WAIT:
		return btrfs_ioctl_quota_rescan_wait(file, argp);
5539 5540
	case BTRFS_IOC_DEV_REPLACE:
		return btrfs_ioctl_dev_replace(root, argp);
5541 5542
	case BTRFS_IOC_GET_FSLABEL:
		return btrfs_ioctl_get_fslabel(file, argp);
5543 5544
	case BTRFS_IOC_SET_FSLABEL:
		return btrfs_ioctl_set_fslabel(file, argp);
5545
	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5546
		return btrfs_ioctl_get_supported_features(argp);
5547 5548 5549 5550
	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
5551 5552 5553 5554
	}

	return -ENOTTY;
}
5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575

#ifdef CONFIG_COMPAT
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
	case FS_IOC32_GETFLAGS:
		cmd = FS_IOC_GETFLAGS;
		break;
	case FS_IOC32_SETFLAGS:
		cmd = FS_IOC_SETFLAGS;
		break;
	case FS_IOC32_GETVERSION:
		cmd = FS_IOC_GETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif