ctree.h 98.6 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.
 */

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#ifndef __BTRFS_CTREE__
#define __BTRFS_CTREE__
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#include <linux/mm.h>
#include <linux/highmem.h>
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#include <linux/fs.h>
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#include <linux/rwsem.h>
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#include <linux/completion.h>
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#include <linux/backing-dev.h>
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/kobject.h>
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#include <trace/events/btrfs.h>
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#include <asm/kmap_types.h>
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#include <linux/pagemap.h>
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#include "extent_io.h"
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#include "extent_map.h"
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#include "async-thread.h"
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#include "ioctl.h"
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struct btrfs_trans_handle;
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struct btrfs_transaction;
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struct btrfs_pending_snapshot;
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extern struct kmem_cache *btrfs_trans_handle_cachep;
extern struct kmem_cache *btrfs_transaction_cachep;
extern struct kmem_cache *btrfs_bit_radix_cachep;
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extern struct kmem_cache *btrfs_path_cachep;
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extern struct kmem_cache *btrfs_free_space_cachep;
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struct btrfs_ordered_sum;
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#define BTRFS_MAGIC "_BHRfS_M"
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#define BTRFS_MAX_MIRRORS 2

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#define BTRFS_MAX_LEVEL 8
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#define BTRFS_COMPAT_EXTENT_TREE_V0

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/*
 * files bigger than this get some pre-flushing when they are added
 * to the ordered operations list.  That way we limit the total
 * work done by the commit
 */
#define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)

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/* holds pointers to all of the tree roots */
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#define BTRFS_ROOT_TREE_OBJECTID 1ULL
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/* stores information about which extents are in use, and reference counts */
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#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
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/*
 * chunk tree stores translations from logical -> physical block numbering
 * the super block points to the chunk tree
 */
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#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
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/*
 * stores information about which areas of a given device are in use.
 * one per device.  The tree of tree roots points to the device tree
 */
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#define BTRFS_DEV_TREE_OBJECTID 4ULL

/* one per subvolume, storing files and directories */
#define BTRFS_FS_TREE_OBJECTID 5ULL

/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
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/* holds checksums of all the data extents */
#define BTRFS_CSUM_TREE_OBJECTID 7ULL

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/* for storing balance parameters in the root tree */
#define BTRFS_BALANCE_OBJECTID -4ULL

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/* orhpan objectid for tracking unlinked/truncated files */
#define BTRFS_ORPHAN_OBJECTID -5ULL

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/* does write ahead logging to speed up fsyncs */
#define BTRFS_TREE_LOG_OBJECTID -6ULL
#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL

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/* for space balancing */
#define BTRFS_TREE_RELOC_OBJECTID -8ULL
#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL

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/*
 * extent checksums all have this objectid
 * this allows them to share the logging tree
 * for fsyncs
 */
#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL

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/* For storing free space cache */
#define BTRFS_FREE_SPACE_OBJECTID -11ULL

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/*
 * The inode number assigned to the special inode for sotring
 * free ino cache
 */
#define BTRFS_FREE_INO_OBJECTID -12ULL

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/* dummy objectid represents multiple objectids */
#define BTRFS_MULTIPLE_OBJECTIDS -255ULL

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/*
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 * All files have objectids in this range.
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 */
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#define BTRFS_FIRST_FREE_OBJECTID 256ULL
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#define BTRFS_LAST_FREE_OBJECTID -256ULL
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#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
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/*
 * the device items go into the chunk tree.  The key is in the form
 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 */
#define BTRFS_DEV_ITEMS_OBJECTID 1ULL

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#define BTRFS_BTREE_INODE_OBJECTID 1

#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2

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/*
 * the max metadata block size.  This limit is somewhat artificial,
 * but the memmove costs go through the roof for larger blocks.
 */
#define BTRFS_MAX_METADATA_BLOCKSIZE 65536

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/*
 * we can actually store much bigger names, but lets not confuse the rest
 * of linux
 */
#define BTRFS_NAME_LEN 255

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/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32
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/* csum types */
#define BTRFS_CSUM_TYPE_CRC32	0

static int btrfs_csum_sizes[] = { 4, 0 };

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/* four bytes for CRC32 */
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#define BTRFS_EMPTY_DIR_SIZE 0
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#define BTRFS_FT_UNKNOWN	0
#define BTRFS_FT_REG_FILE	1
#define BTRFS_FT_DIR		2
#define BTRFS_FT_CHRDEV		3
#define BTRFS_FT_BLKDEV		4
#define BTRFS_FT_FIFO		5
#define BTRFS_FT_SOCK		6
#define BTRFS_FT_SYMLINK	7
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#define BTRFS_FT_XATTR		8
#define BTRFS_FT_MAX		9
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/*
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 * The key defines the order in the tree, and so it also defines (optimal)
 * block layout.
 *
 * objectid corresponds to the inode number.
 *
 * type tells us things about the object, and is a kind of stream selector.
 * so for a given inode, keys with type of 1 might refer to the inode data,
 * type of 2 may point to file data in the btree and type == 3 may point to
 * extents.
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 *
 * offset is the starting byte offset for this key in the stream.
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 *
 * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 * in cpu native order.  Otherwise they are identical and their sizes
 * should be the same (ie both packed)
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 */
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struct btrfs_disk_key {
	__le64 objectid;
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	u8 type;
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	__le64 offset;
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} __attribute__ ((__packed__));

struct btrfs_key {
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	u64 objectid;
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	u8 type;
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	u64 offset;
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} __attribute__ ((__packed__));

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struct btrfs_mapping_tree {
	struct extent_map_tree map_tree;
};

struct btrfs_dev_item {
	/* the internal btrfs device id */
	__le64 devid;

	/* size of the device */
	__le64 total_bytes;

	/* bytes used */
	__le64 bytes_used;

	/* optimal io alignment for this device */
	__le32 io_align;

	/* optimal io width for this device */
	__le32 io_width;

	/* minimal io size for this device */
	__le32 sector_size;

	/* type and info about this device */
	__le64 type;

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	/* expected generation for this device */
	__le64 generation;

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	/*
	 * starting byte of this partition on the device,
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	 * to allow for stripe alignment in the future
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	 */
	__le64 start_offset;

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	/* grouping information for allocation decisions */
	__le32 dev_group;

	/* seek speed 0-100 where 100 is fastest */
	u8 seek_speed;

	/* bandwidth 0-100 where 100 is fastest */
	u8 bandwidth;

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	/* btrfs generated uuid for this device */
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	u8 uuid[BTRFS_UUID_SIZE];
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	/* uuid of FS who owns this device */
	u8 fsid[BTRFS_UUID_SIZE];
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} __attribute__ ((__packed__));

struct btrfs_stripe {
	__le64 devid;
	__le64 offset;
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	u8 dev_uuid[BTRFS_UUID_SIZE];
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} __attribute__ ((__packed__));

struct btrfs_chunk {
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	/* size of this chunk in bytes */
	__le64 length;

	/* objectid of the root referencing this chunk */
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	__le64 owner;
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	__le64 stripe_len;
	__le64 type;

	/* optimal io alignment for this chunk */
	__le32 io_align;

	/* optimal io width for this chunk */
	__le32 io_width;

	/* minimal io size for this chunk */
	__le32 sector_size;

	/* 2^16 stripes is quite a lot, a second limit is the size of a single
	 * item in the btree
	 */
	__le16 num_stripes;
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	/* sub stripes only matter for raid10 */
	__le16 sub_stripes;
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	struct btrfs_stripe stripe;
	/* additional stripes go here */
} __attribute__ ((__packed__));

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#define BTRFS_FREE_SPACE_EXTENT	1
#define BTRFS_FREE_SPACE_BITMAP	2

struct btrfs_free_space_entry {
	__le64 offset;
	__le64 bytes;
	u8 type;
} __attribute__ ((__packed__));

struct btrfs_free_space_header {
	struct btrfs_disk_key location;
	__le64 generation;
	__le64 num_entries;
	__le64 num_bitmaps;
} __attribute__ ((__packed__));

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static inline unsigned long btrfs_chunk_item_size(int num_stripes)
{
	BUG_ON(num_stripes == 0);
	return sizeof(struct btrfs_chunk) +
		sizeof(struct btrfs_stripe) * (num_stripes - 1);
}

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#define BTRFS_HEADER_FLAG_WRITTEN	(1ULL << 0)
#define BTRFS_HEADER_FLAG_RELOC		(1ULL << 1)
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/*
 * File system states
 */

/* Errors detected */
#define BTRFS_SUPER_FLAG_ERROR		(1ULL << 2)

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#define BTRFS_SUPER_FLAG_SEEDING	(1ULL << 32)
#define BTRFS_SUPER_FLAG_METADUMP	(1ULL << 33)

#define BTRFS_BACKREF_REV_MAX		256
#define BTRFS_BACKREF_REV_SHIFT		56
#define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
					 BTRFS_BACKREF_REV_SHIFT)

#define BTRFS_OLD_BACKREF_REV		0
#define BTRFS_MIXED_BACKREF_REV		1
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/*
 * every tree block (leaf or node) starts with this header.
 */
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struct btrfs_header {
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	/* these first four must match the super block */
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	u8 csum[BTRFS_CSUM_SIZE];
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	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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	__le64 bytenr; /* which block this node is supposed to live in */
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	__le64 flags;
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	/* allowed to be different from the super from here on down */
	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
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	__le64 generation;
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	__le64 owner;
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	__le32 nritems;
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	u8 level;
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} __attribute__ ((__packed__));

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#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
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				      sizeof(struct btrfs_header)) / \
				     sizeof(struct btrfs_key_ptr))
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#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
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#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
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#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
					sizeof(struct btrfs_item) - \
					sizeof(struct btrfs_file_extent_item))
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#define BTRFS_MAX_XATTR_SIZE(r)	(BTRFS_LEAF_DATA_SIZE(r) - \
				 sizeof(struct btrfs_item) -\
				 sizeof(struct btrfs_dir_item))
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/*
 * this is a very generous portion of the super block, giving us
 * room to translate 14 chunks with 3 stripes each.
 */
#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
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#define BTRFS_LABEL_SIZE 256
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/*
 * just in case we somehow lose the roots and are not able to mount,
 * we store an array of the roots from previous transactions
 * in the super.
 */
#define BTRFS_NUM_BACKUP_ROOTS 4
struct btrfs_root_backup {
	__le64 tree_root;
	__le64 tree_root_gen;

	__le64 chunk_root;
	__le64 chunk_root_gen;

	__le64 extent_root;
	__le64 extent_root_gen;

	__le64 fs_root;
	__le64 fs_root_gen;

	__le64 dev_root;
	__le64 dev_root_gen;

	__le64 csum_root;
	__le64 csum_root_gen;

	__le64 total_bytes;
	__le64 bytes_used;
	__le64 num_devices;
	/* future */
	__le64 unsed_64[4];

	u8 tree_root_level;
	u8 chunk_root_level;
	u8 extent_root_level;
	u8 fs_root_level;
	u8 dev_root_level;
	u8 csum_root_level;
	/* future and to align */
	u8 unused_8[10];
} __attribute__ ((__packed__));

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/*
 * the super block basically lists the main trees of the FS
 * it currently lacks any block count etc etc
 */
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struct btrfs_super_block {
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	u8 csum[BTRFS_CSUM_SIZE];
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	/* the first 4 fields must match struct btrfs_header */
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	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
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	__le64 bytenr; /* this block number */
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	__le64 flags;
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	/* allowed to be different from the btrfs_header from here own down */
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	__le64 magic;
	__le64 generation;
	__le64 root;
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	__le64 chunk_root;
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	__le64 log_root;
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	/* this will help find the new super based on the log root */
	__le64 log_root_transid;
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	__le64 total_bytes;
	__le64 bytes_used;
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	__le64 root_dir_objectid;
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	__le64 num_devices;
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	__le32 sectorsize;
	__le32 nodesize;
	__le32 leafsize;
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	__le32 stripesize;
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	__le32 sys_chunk_array_size;
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	__le64 chunk_root_generation;
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	__le64 compat_flags;
	__le64 compat_ro_flags;
	__le64 incompat_flags;
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	__le16 csum_type;
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	u8 root_level;
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	u8 chunk_root_level;
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	u8 log_root_level;
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	struct btrfs_dev_item dev_item;
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	char label[BTRFS_LABEL_SIZE];
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	__le64 cache_generation;

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	/* future expansion */
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	__le64 reserved[31];
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	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
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	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
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} __attribute__ ((__packed__));

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/*
 * Compat flags that we support.  If any incompat flags are set other than the
 * ones specified below then we will fail to mount
 */
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#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF	(1ULL << 0)
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#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL	(1ULL << 1)
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#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS	(1ULL << 2)
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#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO	(1ULL << 3)
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/*
 * some patches floated around with a second compression method
 * lets save that incompat here for when they do get in
 * Note we don't actually support it, we're just reserving the
 * number
 */
#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2	(1ULL << 4)

/*
 * older kernels tried to do bigger metadata blocks, but the
 * code was pretty buggy.  Lets not let them try anymore.
 */
#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA	(1ULL << 5)
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#define BTRFS_FEATURE_COMPAT_SUPP		0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP		0ULL
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#define BTRFS_FEATURE_INCOMPAT_SUPP			\
	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
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	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
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	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
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	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
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	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO)
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/*
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 * A leaf is full of items. offset and size tell us where to find
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 * the item in the leaf (relative to the start of the data area)
 */
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struct btrfs_item {
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	struct btrfs_disk_key key;
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	__le32 offset;
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	__le32 size;
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} __attribute__ ((__packed__));

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/*
 * leaves have an item area and a data area:
 * [item0, item1....itemN] [free space] [dataN...data1, data0]
 *
 * The data is separate from the items to get the keys closer together
 * during searches.
 */
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struct btrfs_leaf {
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	struct btrfs_header header;
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	struct btrfs_item items[];
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} __attribute__ ((__packed__));

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/*
 * all non-leaf blocks are nodes, they hold only keys and pointers to
 * other blocks
 */
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struct btrfs_key_ptr {
	struct btrfs_disk_key key;
	__le64 blockptr;
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	__le64 generation;
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} __attribute__ ((__packed__));

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struct btrfs_node {
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	struct btrfs_header header;
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	struct btrfs_key_ptr ptrs[];
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} __attribute__ ((__packed__));

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/*
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 * btrfs_paths remember the path taken from the root down to the leaf.
 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
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 * to any other levels that are present.
 *
 * The slots array records the index of the item or block pointer
 * used while walking the tree.
 */
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struct btrfs_path {
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	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
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	int slots[BTRFS_MAX_LEVEL];
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	/* if there is real range locking, this locks field will change */
	int locks[BTRFS_MAX_LEVEL];
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	int reada;
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	/* keep some upper locks as we walk down */
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	int lowest_level;
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	/*
	 * set by btrfs_split_item, tells search_slot to keep all locks
	 * and to force calls to keep space in the nodes
	 */
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	unsigned int search_for_split:1;
	unsigned int keep_locks:1;
	unsigned int skip_locking:1;
	unsigned int leave_spinning:1;
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	unsigned int search_commit_root:1;
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};
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/*
 * items in the extent btree are used to record the objectid of the
 * owner of the block and the number of references
 */
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struct btrfs_extent_item {
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	__le64 refs;
	__le64 generation;
	__le64 flags;
} __attribute__ ((__packed__));

struct btrfs_extent_item_v0 {
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	__le32 refs;
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} __attribute__ ((__packed__));

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#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
					sizeof(struct btrfs_item))

#define BTRFS_EXTENT_FLAG_DATA		(1ULL << 0)
#define BTRFS_EXTENT_FLAG_TREE_BLOCK	(1ULL << 1)

/* following flags only apply to tree blocks */

/* use full backrefs for extent pointers in the block */
#define BTRFS_BLOCK_FLAG_FULL_BACKREF	(1ULL << 8)

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/*
 * this flag is only used internally by scrub and may be changed at any time
 * it is only declared here to avoid collisions
 */
#define BTRFS_EXTENT_FLAG_SUPER		(1ULL << 48)

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struct btrfs_tree_block_info {
	struct btrfs_disk_key key;
	u8 level;
} __attribute__ ((__packed__));

struct btrfs_extent_data_ref {
	__le64 root;
	__le64 objectid;
	__le64 offset;
	__le32 count;
} __attribute__ ((__packed__));

struct btrfs_shared_data_ref {
	__le32 count;
} __attribute__ ((__packed__));

struct btrfs_extent_inline_ref {
	u8 type;
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	__le64 offset;
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} __attribute__ ((__packed__));

/* old style backrefs item */
struct btrfs_extent_ref_v0 {
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	__le64 root;
	__le64 generation;
	__le64 objectid;
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	__le32 count;
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} __attribute__ ((__packed__));

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/* dev extents record free space on individual devices.  The owner
 * field points back to the chunk allocation mapping tree that allocated
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 * the extent.  The chunk tree uuid field is a way to double check the owner
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 */
struct btrfs_dev_extent {
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	__le64 chunk_tree;
	__le64 chunk_objectid;
	__le64 chunk_offset;
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	__le64 length;
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	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
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} __attribute__ ((__packed__));

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struct btrfs_inode_ref {
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	__le64 index;
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	__le16 name_len;
	/* name goes here */
} __attribute__ ((__packed__));

640
struct btrfs_timespec {
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	__le64 sec;
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	__le32 nsec;
} __attribute__ ((__packed__));

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enum btrfs_compression_type {
646 647
	BTRFS_COMPRESS_NONE  = 0,
	BTRFS_COMPRESS_ZLIB  = 1,
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	BTRFS_COMPRESS_LZO   = 2,
	BTRFS_COMPRESS_TYPES = 2,
	BTRFS_COMPRESS_LAST  = 3,
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};
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struct btrfs_inode_item {
654
	/* nfs style generation number */
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	__le64 generation;
656 657
	/* transid that last touched this inode */
	__le64 transid;
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	__le64 size;
659
	__le64 nbytes;
660
	__le64 block_group;
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	__le32 nlink;
	__le32 uid;
	__le32 gid;
	__le32 mode;
665
	__le64 rdev;
666
	__le64 flags;
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668 669 670 671 672 673 674 675
	/* modification sequence number for NFS */
	__le64 sequence;

	/*
	 * a little future expansion, for more than this we can
	 * just grow the inode item and version it
	 */
	__le64 reserved[4];
676 677 678 679
	struct btrfs_timespec atime;
	struct btrfs_timespec ctime;
	struct btrfs_timespec mtime;
	struct btrfs_timespec otime;
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} __attribute__ ((__packed__));

682 683 684 685
struct btrfs_dir_log_item {
	__le64 end;
} __attribute__ ((__packed__));

686
struct btrfs_dir_item {
687
	struct btrfs_disk_key location;
688
	__le64 transid;
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	__le16 data_len;
690
	__le16 name_len;
691 692 693
	u8 type;
} __attribute__ ((__packed__));

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#define BTRFS_ROOT_SUBVOL_RDONLY	(1ULL << 0)

696
struct btrfs_root_item {
697
	struct btrfs_inode_item inode;
698
	__le64 generation;
699
	__le64 root_dirid;
700 701 702
	__le64 bytenr;
	__le64 byte_limit;
	__le64 bytes_used;
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	__le64 last_snapshot;
704
	__le64 flags;
705
	__le32 refs;
706 707
	struct btrfs_disk_key drop_progress;
	u8 drop_level;
708
	u8 level;
709
} __attribute__ ((__packed__));
710

711 712 713 714 715 716 717 718 719
/*
 * this is used for both forward and backward root refs
 */
struct btrfs_root_ref {
	__le64 dirid;
	__le64 sequence;
	__le16 name_len;
} __attribute__ ((__packed__));

720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
struct btrfs_disk_balance_args {
	/*
	 * profiles to operate on, single is denoted by
	 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
	 */
	__le64 profiles;

	/* usage filter */
	__le64 usage;

	/* devid filter */
	__le64 devid;

	/* devid subset filter [pstart..pend) */
	__le64 pstart;
	__le64 pend;

	/* btrfs virtual address space subset filter [vstart..vend) */
	__le64 vstart;
	__le64 vend;

	/*
	 * profile to convert to, single is denoted by
	 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
	 */
	__le64 target;

	/* BTRFS_BALANCE_ARGS_* */
	__le64 flags;

	__le64 unused[8];
} __attribute__ ((__packed__));

/*
 * store balance parameters to disk so that balance can be properly
 * resumed after crash or unmount
 */
struct btrfs_balance_item {
	/* BTRFS_BALANCE_* */
	__le64 flags;

	struct btrfs_disk_balance_args data;
	struct btrfs_disk_balance_args meta;
	struct btrfs_disk_balance_args sys;

	__le64 unused[4];
} __attribute__ ((__packed__));

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#define BTRFS_FILE_EXTENT_INLINE 0
#define BTRFS_FILE_EXTENT_REG 1
#define BTRFS_FILE_EXTENT_PREALLOC 2
771

772
struct btrfs_file_extent_item {
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	/*
	 * transaction id that created this extent
	 */
776
	__le64 generation;
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	/*
	 * max number of bytes to hold this extent in ram
	 * when we split a compressed extent we can't know how big
	 * each of the resulting pieces will be.  So, this is
	 * an upper limit on the size of the extent in ram instead of
	 * an exact limit.
	 */
	__le64 ram_bytes;

	/*
	 * 32 bits for the various ways we might encode the data,
	 * including compression and encryption.  If any of these
	 * are set to something a given disk format doesn't understand
	 * it is treated like an incompat flag for reading and writing,
	 * but not for stat.
	 */
	u8 compression;
	u8 encryption;
	__le16 other_encoding; /* spare for later use */

	/* are we inline data or a real extent? */
798
	u8 type;
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800 801 802 803
	/*
	 * disk space consumed by the extent, checksum blocks are included
	 * in these numbers
	 */
804 805
	__le64 disk_bytenr;
	__le64 disk_num_bytes;
806
	/*
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	 * the logical offset in file blocks (no csums)
808 809 810 811 812 813 814
	 * this extent record is for.  This allows a file extent to point
	 * into the middle of an existing extent on disk, sharing it
	 * between two snapshots (useful if some bytes in the middle of the
	 * extent have changed
	 */
	__le64 offset;
	/*
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	 * the logical number of file blocks (no csums included).  This
	 * always reflects the size uncompressed and without encoding.
817
	 */
818
	__le64 num_bytes;
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820 821
} __attribute__ ((__packed__));

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struct btrfs_csum_item {
823
	u8 csum;
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} __attribute__ ((__packed__));

826
/* different types of block groups (and chunks) */
827 828 829 830 831 832 833
#define BTRFS_BLOCK_GROUP_DATA		(1ULL << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM	(1ULL << 1)
#define BTRFS_BLOCK_GROUP_METADATA	(1ULL << 2)
#define BTRFS_BLOCK_GROUP_RAID0		(1ULL << 3)
#define BTRFS_BLOCK_GROUP_RAID1		(1ULL << 4)
#define BTRFS_BLOCK_GROUP_DUP		(1ULL << 5)
#define BTRFS_BLOCK_GROUP_RAID10	(1ULL << 6)
834
#define BTRFS_BLOCK_GROUP_RESERVED	BTRFS_AVAIL_ALLOC_BIT_SINGLE
835 836 837 838 839 840 841 842 843 844
#define BTRFS_NR_RAID_TYPES		5

#define BTRFS_BLOCK_GROUP_TYPE_MASK	(BTRFS_BLOCK_GROUP_DATA |    \
					 BTRFS_BLOCK_GROUP_SYSTEM |  \
					 BTRFS_BLOCK_GROUP_METADATA)

#define BTRFS_BLOCK_GROUP_PROFILE_MASK	(BTRFS_BLOCK_GROUP_RAID0 |   \
					 BTRFS_BLOCK_GROUP_RAID1 |   \
					 BTRFS_BLOCK_GROUP_DUP |     \
					 BTRFS_BLOCK_GROUP_RAID10)
845 846 847 848 849 850 851 852 853
/*
 * We need a bit for restriper to be able to tell when chunks of type
 * SINGLE are available.  This "extended" profile format is used in
 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
 * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
 * to avoid remappings between two formats in future.
 */
#define BTRFS_AVAIL_ALLOC_BIT_SINGLE	(1ULL << 48)

854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
#define BTRFS_EXTENDED_PROFILE_MASK	(BTRFS_BLOCK_GROUP_PROFILE_MASK | \
					 BTRFS_AVAIL_ALLOC_BIT_SINGLE)

static inline u64 chunk_to_extended(u64 flags)
{
	if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
		flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;

	return flags;
}
static inline u64 extended_to_chunk(u64 flags)
{
	return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
}

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struct btrfs_block_group_item {
	__le64 used;
871 872
	__le64 chunk_objectid;
	__le64 flags;
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} __attribute__ ((__packed__));

875 876
struct btrfs_space_info {
	u64 flags;
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	u64 total_bytes;	/* total bytes in the space,
				   this doesn't take mirrors into account */
880
	u64 bytes_used;		/* total bytes used,
881
				   this doesn't take mirrors into account */
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	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
				   transaction finishes */
	u64 bytes_reserved;	/* total bytes the allocator has reserved for
				   current allocations */
	u64 bytes_readonly;	/* total bytes that are read only */
887

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	u64 bytes_may_use;	/* number of bytes that may be used for
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				   delalloc/allocations */
890
	u64 disk_used;		/* total bytes used on disk */
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	u64 disk_total;		/* total bytes on disk, takes mirrors into
				   account */
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894 895 896 897 898 899 900 901 902
	/*
	 * we bump reservation progress every time we decrement
	 * bytes_reserved.  This way people waiting for reservations
	 * know something good has happened and they can check
	 * for progress.  The number here isn't to be trusted, it
	 * just shows reclaim activity
	 */
	unsigned long reservation_progress;

903
	unsigned int full:1;	/* indicates that we cannot allocate any more
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904
				   chunks for this space */
905
	unsigned int chunk_alloc:1;	/* set if we are allocating a chunk */
906

907 908
	unsigned int flush:1;		/* set if we are trying to make space */

909 910
	unsigned int force_alloc;	/* set if we need to force a chunk
					   alloc for this space */
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912
	struct list_head list;
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913 914

	/* for block groups in our same type */
915
	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
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916
	spinlock_t lock;
917
	struct rw_semaphore groups_sem;
918
	wait_queue_head_t wait;
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919 920
};

921 922 923 924 925
struct btrfs_block_rsv {
	u64 size;
	u64 reserved;
	struct btrfs_space_info *space_info;
	spinlock_t lock;
926
	unsigned int full;
927 928
};

929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
/*
 * free clusters are used to claim free space in relatively large chunks,
 * allowing us to do less seeky writes.  They are used for all metadata
 * allocations and data allocations in ssd mode.
 */
struct btrfs_free_cluster {
	spinlock_t lock;
	spinlock_t refill_lock;
	struct rb_root root;

	/* largest extent in this cluster */
	u64 max_size;

	/* first extent starting offset */
	u64 window_start;

	struct btrfs_block_group_cache *block_group;
	/*
	 * when a cluster is allocated from a block group, we put the
	 * cluster onto a list in the block group so that it can
	 * be freed before the block group is freed.
	 */
	struct list_head block_group_list;
952 953
};

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enum btrfs_caching_type {
	BTRFS_CACHE_NO		= 0,
	BTRFS_CACHE_STARTED	= 1,
957 958
	BTRFS_CACHE_FAST	= 2,
	BTRFS_CACHE_FINISHED	= 3,
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};

961 962 963 964 965 966 967 968
enum btrfs_disk_cache_state {
	BTRFS_DC_WRITTEN	= 0,
	BTRFS_DC_ERROR		= 1,
	BTRFS_DC_CLEAR		= 2,
	BTRFS_DC_SETUP		= 3,
	BTRFS_DC_NEED_WRITE	= 4,
};

969 970 971 972
struct btrfs_caching_control {
	struct list_head list;
	struct mutex mutex;
	wait_queue_head_t wait;
973
	struct btrfs_work work;
974 975 976 977 978
	struct btrfs_block_group_cache *block_group;
	u64 progress;
	atomic_t count;
};

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struct btrfs_block_group_cache {
	struct btrfs_key key;
	struct btrfs_block_group_item item;
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	struct btrfs_fs_info *fs_info;
983
	struct inode *inode;
984
	spinlock_t lock;
985
	u64 pinned;
986
	u64 reserved;
987
	u64 bytes_super;
988
	u64 flags;
989
	u64 sectorsize;
990
	u64 cache_generation;
991 992 993
	unsigned int ro:1;
	unsigned int dirty:1;
	unsigned int iref:1;
994 995

	int disk_cache_state;
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	/* cache tracking stuff */
	int cached;
999 1000
	struct btrfs_caching_control *caching_ctl;
	u64 last_byte_to_unpin;
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	struct btrfs_space_info *space_info;

	/* free space cache stuff */
1005
	struct btrfs_free_space_ctl *free_space_ctl;
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	/* block group cache stuff */
	struct rb_node cache_node;

	/* for block groups in the same raid type */
	struct list_head list;
1012 1013 1014

	/* usage count */
	atomic_t count;
1015 1016 1017 1018 1019

	/* List of struct btrfs_free_clusters for this block group.
	 * Today it will only have one thing on it, but that may change
	 */
	struct list_head cluster_list;
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1020
};
1021

1022
struct reloc_control;
1023
struct btrfs_device;
1024
struct btrfs_fs_devices;
1025
struct btrfs_balance_control;
1026
struct btrfs_delayed_root;
1027
struct btrfs_fs_info {
1028
	u8 fsid[BTRFS_FSID_SIZE];
1029
	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1030 1031
	struct btrfs_root *extent_root;
	struct btrfs_root *tree_root;
1032 1033
	struct btrfs_root *chunk_root;
	struct btrfs_root *dev_root;
1034
	struct btrfs_root *fs_root;
1035
	struct btrfs_root *csum_root;
1036 1037 1038

	/* the log root tree is a directory of all the other log roots */
	struct btrfs_root *log_root_tree;
1039 1040

	spinlock_t fs_roots_radix_lock;
1041
	struct radix_tree_root fs_roots_radix;
1042

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1043 1044 1045 1046
	/* block group cache stuff */
	spinlock_t block_group_cache_lock;
	struct rb_root block_group_cache_tree;

1047 1048 1049 1050
	/* keep track of unallocated space */
	spinlock_t free_chunk_lock;
	u64 free_chunk_space;

1051 1052
	struct extent_io_tree freed_extents[2];
	struct extent_io_tree *pinned_extents;
1053

1054 1055 1056
	/* logical->physical extent mapping */
	struct btrfs_mapping_tree mapping_tree;

1057 1058 1059 1060
	/*
	 * block reservation for extent, checksum, root tree and
	 * delayed dir index item
	 */
1061 1062 1063 1064 1065 1066 1067
	struct btrfs_block_rsv global_block_rsv;
	/* block reservation for delay allocation */
	struct btrfs_block_rsv delalloc_block_rsv;
	/* block reservation for metadata operations */
	struct btrfs_block_rsv trans_block_rsv;
	/* block reservation for chunk tree */
	struct btrfs_block_rsv chunk_block_rsv;
1068 1069
	/* block reservation for delayed operations */
	struct btrfs_block_rsv delayed_block_rsv;
1070 1071 1072

	struct btrfs_block_rsv empty_block_rsv;

1073
	u64 generation;
1074
	u64 last_trans_committed;
1075 1076 1077 1078 1079 1080

	/*
	 * this is updated to the current trans every time a full commit
	 * is required instead of the faster short fsync log commits
	 */
	u64 last_trans_log_full_commit;
1081
	unsigned long mount_opt;
1082
	unsigned long compress_type:4;
1083
	u64 max_inline;
1084
	u64 alloc_start;
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	struct btrfs_transaction *running_transaction;
1086
	wait_queue_head_t transaction_throttle;
1087
	wait_queue_head_t transaction_wait;
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1088
	wait_queue_head_t transaction_blocked_wait;
1089
	wait_queue_head_t async_submit_wait;
1090

1091 1092
	struct btrfs_super_block *super_copy;
	struct btrfs_super_block *super_for_commit;
1093
	struct block_device *__bdev;
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1094
	struct super_block *sb;
1095
	struct inode *btree_inode;
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1096
	struct backing_dev_info bdi;
1097
	struct mutex tree_log_mutex;
1098 1099
	struct mutex transaction_kthread_mutex;
	struct mutex cleaner_mutex;
1100
	struct mutex chunk_mutex;
1101
	struct mutex volume_mutex;
1102 1103 1104 1105 1106 1107 1108 1109
	/*
	 * this protects the ordered operations list only while we are
	 * processing all of the entries on it.  This way we make
	 * sure the commit code doesn't find the list temporarily empty
	 * because another function happens to be doing non-waiting preflush
	 * before jumping into the main commit.
	 */
	struct mutex ordered_operations_mutex;
1110
	struct rw_semaphore extent_commit_sem;
1111

1112
	struct rw_semaphore cleanup_work_sem;
1113

1114
	struct rw_semaphore subvol_sem;
1115 1116
	struct srcu_struct subvol_srcu;

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1117
	spinlock_t trans_lock;
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1118 1119 1120 1121 1122 1123
	/*
	 * the reloc mutex goes with the trans lock, it is taken
	 * during commit to protect us from the relocation code
	 */
	struct mutex reloc_mutex;

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1124
	struct list_head trans_list;
1125
	struct list_head hashers;
1126
	struct list_head dead_roots;
1127
	struct list_head caching_block_groups;
1128

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1129 1130 1131
	spinlock_t delayed_iput_lock;
	struct list_head delayed_iputs;

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1132 1133 1134 1135 1136 1137 1138 1139 1140
	/* this protects tree_mod_seq_list */
	spinlock_t tree_mod_seq_lock;
	atomic_t tree_mod_seq;
	struct list_head tree_mod_seq_list;

	/* this protects tree_mod_log */
	rwlock_t tree_mod_log_lock;
	struct rb_root tree_mod_log;

1141
	atomic_t nr_async_submits;
1142
	atomic_t async_submit_draining;
1143
	atomic_t nr_async_bios;
1144
	atomic_t async_delalloc_pages;
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1145
	atomic_t open_ioctl_trans;
1146

1147 1148 1149 1150 1151
	/*
	 * this is used by the balancing code to wait for all the pending
	 * ordered extents
	 */
	spinlock_t ordered_extent_lock;
1152 1153 1154 1155 1156 1157

	/*
	 * all of the data=ordered extents pending writeback
	 * these can span multiple transactions and basically include
	 * every dirty data page that isn't from nodatacow
	 */
1158
	struct list_head ordered_extents;
1159 1160 1161 1162 1163 1164

	/*
	 * all of the inodes that have delalloc bytes.  It is possible for
	 * this list to be empty even when there is still dirty data=ordered
	 * extents waiting to finish IO.
	 */
1165
	struct list_head delalloc_inodes;
1166

1167 1168 1169 1170 1171 1172 1173
	/*
	 * special rename and truncate targets that must be on disk before
	 * we're allowed to commit.  This is basically the ext3 style
	 * data=ordered list.
	 */
	struct list_head ordered_operations;

1174 1175 1176 1177 1178 1179
	/*
	 * there is a pool of worker threads for checksumming during writes
	 * and a pool for checksumming after reads.  This is because readers
	 * can run with FS locks held, and the writers may be waiting for
	 * those locks.  We don't want ordering in the pending list to cause
	 * deadlocks, and so the two are serviced separately.
1180 1181 1182
	 *
	 * A third pool does submit_bio to avoid deadlocking with the other
	 * two
1183
	 */
1184
	struct btrfs_workers generic_worker;
1185
	struct btrfs_workers workers;
1186
	struct btrfs_workers delalloc_workers;
1187
	struct btrfs_workers endio_workers;
1188
	struct btrfs_workers endio_meta_workers;
1189
	struct btrfs_workers endio_meta_write_workers;
1190
	struct btrfs_workers endio_write_workers;
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	struct btrfs_workers endio_freespace_worker;
1192
	struct btrfs_workers submit_workers;
1193
	struct btrfs_workers caching_workers;
1194
	struct btrfs_workers readahead_workers;
1195

1196 1197 1198 1199 1200 1201
	/*
	 * fixup workers take dirty pages that didn't properly go through
	 * the cow mechanism and make them safe to write.  It happens
	 * for the sys_munmap function call path
	 */
	struct btrfs_workers fixup_workers;
1202
	struct btrfs_workers delayed_workers;
1203 1204
	struct task_struct *transaction_kthread;
	struct task_struct *cleaner_kthread;
1205
	int thread_pool_size;
1206

1207 1208
	struct kobject super_kobj;
	struct completion kobj_unregister;
1209
	int do_barriers;
1210
	int closing;
1211
	int log_root_recovering;
1212
	int enospc_unlink;
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1213
	int trans_no_join;
1214

1215
	u64 total_pinned;
1216 1217 1218 1219 1220

	/* protected by the delalloc lock, used to keep from writing
	 * metadata until there is a nice batch
	 */
	u64 dirty_metadata_bytes;
1221 1222
	struct list_head dirty_cowonly_roots;

1223
	struct btrfs_fs_devices *fs_devices;
1224 1225 1226 1227 1228 1229

	/*
	 * the space_info list is almost entirely read only.  It only changes
	 * when we add a new raid type to the FS, and that happens
	 * very rarely.  RCU is used to protect it.
	 */
1230
	struct list_head space_info;
1231

1232 1233
	struct reloc_control *reloc_ctl;

1234 1235
	spinlock_t delalloc_lock;
	u64 delalloc_bytes;
1236 1237 1238 1239 1240 1241

	/* data_alloc_cluster is only used in ssd mode */
	struct btrfs_free_cluster data_alloc_cluster;

	/* all metadata allocations go through this cluster */
	struct btrfs_free_cluster meta_alloc_cluster;
C
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1242

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	/* auto defrag inodes go here */
	spinlock_t defrag_inodes_lock;
	struct rb_root defrag_inodes;
	atomic_t defrag_running;

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	spinlock_t ref_cache_lock;
	u64 total_ref_cache_size;

1251 1252 1253 1254 1255
	/*
	 * these three are in extended format (availability of single
	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
	 */
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	u64 avail_data_alloc_bits;
	u64 avail_metadata_alloc_bits;
	u64 avail_system_alloc_bits;
1259

1260 1261 1262
	/* restriper state */
	spinlock_t balance_lock;
	struct mutex balance_mutex;
1263 1264
	atomic_t balance_running;
	atomic_t balance_pause_req;
1265
	atomic_t balance_cancel_req;
1266
	struct btrfs_balance_control *balance_ctl;
1267
	wait_queue_head_t balance_wait_q;
1268

1269 1270 1271
	unsigned data_chunk_allocations;
	unsigned metadata_ratio;

1272
	void *bdev_holder;
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1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
	/* private scrub information */
	struct mutex scrub_lock;
	atomic_t scrubs_running;
	atomic_t scrub_pause_req;
	atomic_t scrubs_paused;
	atomic_t scrub_cancel_req;
	wait_queue_head_t scrub_pause_wait;
	struct rw_semaphore scrub_super_lock;
	int scrub_workers_refcnt;
	struct btrfs_workers scrub_workers;

1285 1286 1287 1288
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	u32 check_integrity_print_mask;
#endif

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	/* filesystem state */
	u64 fs_state;
1291 1292

	struct btrfs_delayed_root *delayed_root;
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1294 1295 1296
	/* readahead tree */
	spinlock_t reada_lock;
	struct radix_tree_root reada_tree;
1297

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	/* next backup root to be overwritten */
	int backup_root_index;
1300
};
1301

1302 1303
/*
 * in ram representation of the tree.  extent_root is used for all allocations
1304
 * and for the extent tree extent_root root.
1305 1306
 */
struct btrfs_root {
1307
	struct extent_buffer *node;
1308

1309
	struct extent_buffer *commit_root;
1310
	struct btrfs_root *log_root;
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	struct btrfs_root *reloc_root;
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1313 1314
	struct btrfs_root_item root_item;
	struct btrfs_key root_key;
1315
	struct btrfs_fs_info *fs_info;
1316 1317
	struct extent_io_tree dirty_log_pages;

1318 1319
	struct kobject root_kobj;
	struct completion kobj_unregister;
1320
	struct mutex objectid_mutex;
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1322 1323 1324
	spinlock_t accounting_lock;
	struct btrfs_block_rsv *block_rsv;

1325 1326 1327 1328 1329 1330 1331 1332
	/* free ino cache stuff */
	struct mutex fs_commit_mutex;
	struct btrfs_free_space_ctl *free_ino_ctl;
	enum btrfs_caching_type cached;
	spinlock_t cache_lock;
	wait_queue_head_t cache_wait;
	struct btrfs_free_space_ctl *free_ino_pinned;
	u64 cache_progress;
1333
	struct inode *cache_inode;
1334

1335
	struct mutex log_mutex;
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	wait_queue_head_t log_writer_wait;
	wait_queue_head_t log_commit_wait[2];
	atomic_t log_writers;
	atomic_t log_commit[2];
	unsigned long log_transid;
1341
	unsigned long last_log_commit;
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	unsigned long log_batch;
1343 1344
	pid_t log_start_pid;
	bool log_multiple_pids;
1345

1346 1347
	u64 objectid;
	u64 last_trans;
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357

	/* data allocations are done in sectorsize units */
	u32 sectorsize;

	/* node allocations are done in nodesize units */
	u32 nodesize;

	/* leaf allocations are done in leafsize units */
	u32 leafsize;

1358 1359
	u32 stripesize;

1360
	u32 type;
1361 1362

	u64 highest_objectid;
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	/* btrfs_record_root_in_trans is a multi-step process,
	 * and it can race with the balancing code.   But the
	 * race is very small, and only the first time the root
	 * is added to each transaction.  So in_trans_setup
	 * is used to tell us when more checks are required
	 */
	unsigned long in_trans_setup;
1371
	int ref_cows;
1372
	int track_dirty;
1373 1374
	int in_radix;

1375
	u64 defrag_trans_start;
1376
	struct btrfs_key defrag_progress;
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	struct btrfs_key defrag_max;
1378
	int defrag_running;
1379
	char *name;
1380 1381 1382

	/* the dirty list is only used by non-reference counted roots */
	struct list_head dirty_list;
1383

1384 1385
	struct list_head root_list;

1386
	spinlock_t orphan_lock;
1387
	struct list_head orphan_list;
1388 1389 1390
	struct btrfs_block_rsv *orphan_block_rsv;
	int orphan_item_inserted;
	int orphan_cleanup_state;
1391

1392 1393 1394 1395
	spinlock_t inode_lock;
	/* red-black tree that keeps track of in-memory inodes */
	struct rb_root inode_tree;

1396 1397 1398 1399 1400
	/*
	 * radix tree that keeps track of delayed nodes of every inode,
	 * protected by inode_lock
	 */
	struct radix_tree_root delayed_nodes_tree;
1401 1402 1403 1404
	/*
	 * right now this just gets used so that a root has its own devid
	 * for stat.  It may be used for more later
	 */
1405
	dev_t anon_dev;
1406 1407

	int force_cow;
1408 1409
};

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struct btrfs_ioctl_defrag_range_args {
	/* start of the defrag operation */
	__u64 start;

	/* number of bytes to defrag, use (u64)-1 to say all */
	__u64 len;

	/*
	 * flags for the operation, which can include turning
	 * on compression for this one defrag
	 */
	__u64 flags;

	/*
	 * any extent bigger than this will be considered
	 * already defragged.  Use 0 to take the kernel default
	 * Use 1 to say every single extent must be rewritten
	 */
	__u32 extent_thresh;

	/*
	 * which compression method to use if turning on compression
	 * for this defrag operation.  If unspecified, zlib will
	 * be used
	 */
	__u32 compress_type;

	/* spare for later */
	__u32 unused[4];
};


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/*
 * inode items have the data typically returned from stat and store other
 * info about object characteristics.  There is one for every file and dir in
 * the FS
 */
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#define BTRFS_INODE_ITEM_KEY		1
1448 1449 1450
#define BTRFS_INODE_REF_KEY		12
#define BTRFS_XATTR_ITEM_KEY		24
#define BTRFS_ORPHAN_ITEM_KEY		48
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/* reserve 2-15 close to the inode for later flexibility */
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/*
 * dir items are the name -> inode pointers in a directory.  There is one
 * for every name in a directory.
 */
1457 1458 1459 1460
#define BTRFS_DIR_LOG_ITEM_KEY  60
#define BTRFS_DIR_LOG_INDEX_KEY 72
#define BTRFS_DIR_ITEM_KEY	84
#define BTRFS_DIR_INDEX_KEY	96
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/*
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 * extent data is for file data
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 */
1464
#define BTRFS_EXTENT_DATA_KEY	108
1465

C
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/*
1467 1468
 * extent csums are stored in a separate tree and hold csums for
 * an entire extent on disk.
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 */
1470
#define BTRFS_EXTENT_CSUM_KEY	128
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/*
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 * root items point to tree roots.  They are typically in the root
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 * tree used by the super block to find all the other trees
 */
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
#define BTRFS_ROOT_ITEM_KEY	132

/*
 * root backrefs tie subvols and snapshots to the directory entries that
 * reference them
 */
#define BTRFS_ROOT_BACKREF_KEY	144

/*
 * root refs make a fast index for listing all of the snapshots and
 * subvolumes referenced by a given root.  They point directly to the
 * directory item in the root that references the subvol
 */
#define BTRFS_ROOT_REF_KEY	156

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/*
 * extent items are in the extent map tree.  These record which blocks
 * are used, and how many references there are to each block
 */
1495
#define BTRFS_EXTENT_ITEM_KEY	168
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505

#define BTRFS_TREE_BLOCK_REF_KEY	176

#define BTRFS_EXTENT_DATA_REF_KEY	178

#define BTRFS_EXTENT_REF_V0_KEY		180

#define BTRFS_SHARED_BLOCK_REF_KEY	182

#define BTRFS_SHARED_DATA_REF_KEY	184
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/*
 * block groups give us hints into the extent allocation trees.  Which
 * blocks are free etc etc
 */
1511
#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1512

1513 1514 1515
#define BTRFS_DEV_EXTENT_KEY	204
#define BTRFS_DEV_ITEM_KEY	216
#define BTRFS_CHUNK_ITEM_KEY	228
1516

1517 1518
#define BTRFS_BALANCE_ITEM_KEY	248

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/*
 * string items are for debugging.  They just store a short string of
 * data in the FS
 */
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#define BTRFS_STRING_ITEM_KEY	253

1525 1526 1527 1528 1529
/*
 * Flags for mount options.
 *
 * Note: don't forget to add new options to btrfs_show_options()
 */
1530 1531 1532
#define BTRFS_MOUNT_NODATASUM		(1 << 0)
#define BTRFS_MOUNT_NODATACOW		(1 << 1)
#define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1533
#define BTRFS_MOUNT_SSD			(1 << 3)
1534
#define BTRFS_MOUNT_DEGRADED		(1 << 4)
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#define BTRFS_MOUNT_COMPRESS		(1 << 5)
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#define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1537
#define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1538
#define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
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#define BTRFS_MOUNT_NOSSD		(1 << 9)
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#define BTRFS_MOUNT_DISCARD		(1 << 10)
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#define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1542
#define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
1543
#define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
1544
#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1545
#define BTRFS_MOUNT_ENOSPC_DEBUG	 (1 << 15)
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#define BTRFS_MOUNT_AUTO_DEFRAG		(1 << 16)
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#define BTRFS_MOUNT_INODE_MAP_CACHE	(1 << 17)
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#define BTRFS_MOUNT_RECOVERY		(1 << 18)
1549
#define BTRFS_MOUNT_SKIP_BALANCE	(1 << 19)
1550 1551
#define BTRFS_MOUNT_CHECK_INTEGRITY	(1 << 20)
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
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#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)
1553 1554 1555 1556 1557

#define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
#define btrfs_test_opt(root, opt)	((root)->fs_info->mount_opt & \
					 BTRFS_MOUNT_##opt)
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/*
 * Inode flags
 */
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1561 1562 1563
#define BTRFS_INODE_NODATASUM		(1 << 0)
#define BTRFS_INODE_NODATACOW		(1 << 1)
#define BTRFS_INODE_READONLY		(1 << 2)
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#define BTRFS_INODE_NOCOMPRESS		(1 << 3)
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#define BTRFS_INODE_PREALLOC		(1 << 4)
1566 1567 1568 1569 1570 1571
#define BTRFS_INODE_SYNC		(1 << 5)
#define BTRFS_INODE_IMMUTABLE		(1 << 6)
#define BTRFS_INODE_APPEND		(1 << 7)
#define BTRFS_INODE_NODUMP		(1 << 8)
#define BTRFS_INODE_NOATIME		(1 << 9)
#define BTRFS_INODE_DIRSYNC		(1 << 10)
1572
#define BTRFS_INODE_COMPRESS		(1 << 11)
1573

1574 1575
#define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)

1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
struct btrfs_map_token {
	struct extent_buffer *eb;
	char *kaddr;
	unsigned long offset;
};

static inline void btrfs_init_map_token (struct btrfs_map_token *token)
{
	memset(token, 0, sizeof(*token));
}

1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
/* some macros to generate set/get funcs for the struct fields.  This
 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 * one for u8:
 */
#define le8_to_cpu(v) (v)
#define cpu_to_le8(v) (v)
#define __le8 u8

#define read_eb_member(eb, ptr, type, member, result) (			\
	read_extent_buffer(eb, (char *)(result),			\
			   ((unsigned long)(ptr)) +			\
			    offsetof(type, member),			\
			   sizeof(((type *)0)->member)))

#define write_eb_member(eb, ptr, type, member, result) (		\
	write_extent_buffer(eb, (char *)(result),			\
			   ((unsigned long)(ptr)) +			\
			    offsetof(type, member),			\
			   sizeof(((type *)0)->member)))

1607
#ifndef BTRFS_SETGET_FUNCS
1608
#define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1609
u##bits btrfs_##name(struct extent_buffer *eb, type *s);		\
1610 1611
u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, struct btrfs_map_token *token);		\
void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token);\
1612 1613
void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
#endif
1614 1615 1616 1617

#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
{									\
1618
	type *p = page_address(eb->pages[0]);				\
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1619
	u##bits res = le##bits##_to_cpu(p->member);			\
1620
	return res;							\
1621 1622 1623 1624
}									\
static inline void btrfs_set_##name(struct extent_buffer *eb,		\
				    u##bits val)			\
{									\
1625
	type *p = page_address(eb->pages[0]);				\
D
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1626
	p->member = cpu_to_le##bits(val);				\
1627
}
C
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1629 1630 1631 1632 1633 1634 1635 1636
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
static inline u##bits btrfs_##name(type *s)				\
{									\
	return le##bits##_to_cpu(s->member);				\
}									\
static inline void btrfs_set_##name(type *s, u##bits val)		\
{									\
	s->member = cpu_to_le##bits(val);				\
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}

1639 1640 1641 1642 1643
BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1644 1645
BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
		   start_offset, 64);
1646 1647
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1648 1649 1650
BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
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BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1652

1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
			 total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
			 bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
			 io_align, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
			 io_width, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
			 sector_size, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1665 1666 1667 1668 1669 1670
BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
			 dev_group, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
			 seek_speed, 8);
BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
			 bandwidth, 8);
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BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
			 generation, 64);
1673

1674 1675 1676 1677 1678
static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
	return (char *)d + offsetof(struct btrfs_dev_item, uuid);
}

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static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
{
	return (char *)d + offsetof(struct btrfs_dev_item, fsid);
}

1684
BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1685 1686 1687 1688 1689 1690 1691
BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
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BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1693 1694 1695
BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);

1696 1697 1698 1699 1700 1701
static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
{
	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
}

BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
			 stripe_len, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
			 io_align, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
			 io_width, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
			 sector_size, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
			 num_stripes, 16);
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1714 1715
BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
			 sub_stripes, 16);
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);

static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
						   int nr)
{
	unsigned long offset = (unsigned long)c;
	offset += offsetof(struct btrfs_chunk, stripe);
	offset += nr * sizeof(struct btrfs_stripe);
	return (struct btrfs_stripe *)offset;
}

1728 1729 1730 1731 1732
static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
{
	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
}

1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
					 struct btrfs_chunk *c, int nr)
{
	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
}

static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
					 struct btrfs_chunk *c, int nr)
{
	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
}

1745 1746 1747 1748 1749
/* struct btrfs_block_group_item */
BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
			 used, 64);
BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
			 used, 64);
1750 1751
BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
			struct btrfs_block_group_item, chunk_objectid, 64);
1752 1753

BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1754 1755 1756 1757 1758
		   struct btrfs_block_group_item, chunk_objectid, 64);
BTRFS_SETGET_FUNCS(disk_block_group_flags,
		   struct btrfs_block_group_item, flags, 64);
BTRFS_SETGET_STACK_FUNCS(block_group_flags,
			struct btrfs_block_group_item, flags, 64);
C
Chris Mason 已提交
1759

1760 1761
/* struct btrfs_inode_ref */
BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1762
BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1763

1764 1765
/* struct btrfs_inode_item */
BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1766
BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1767
BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1768
BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1769
BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1770 1771 1772 1773 1774
BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1775
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1776
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
C
Chris Mason 已提交
1777

1778
static inline struct btrfs_timespec *
1779
btrfs_inode_atime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
1780
{
1781 1782
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, atime);
1783
	return (struct btrfs_timespec *)ptr;
C
Chris Mason 已提交
1784 1785
}

1786
static inline struct btrfs_timespec *
1787
btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
1788
{
1789 1790
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, mtime);
1791
	return (struct btrfs_timespec *)ptr;
C
Chris Mason 已提交
1792 1793
}

1794
static inline struct btrfs_timespec *
1795
btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
1796
{
1797 1798
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, ctime);
1799
	return (struct btrfs_timespec *)ptr;
C
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1800 1801
}

1802 1803
BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
C
Chris Mason 已提交
1804

1805
/* struct btrfs_dev_extent */
1806 1807 1808 1809 1810 1811
BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
		   chunk_tree, 64);
BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
		   chunk_objectid, 64);
BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
		   chunk_offset, 64);
1812 1813
BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);

1814 1815 1816 1817 1818 1819
static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
{
	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
	return (u8 *)((unsigned long)dev + ptr);
}

1820 1821 1822 1823
BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
		   generation, 64);
BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1824

1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);


BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);

static inline void btrfs_tree_block_key(struct extent_buffer *eb,
					struct btrfs_tree_block_info *item,
					struct btrfs_disk_key *key)
{
	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}

static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
					    struct btrfs_tree_block_info *item,
					    struct btrfs_disk_key *key)
{
	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}
C
Chris Mason 已提交
1843

1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
		   root, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
		   objectid, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
		   offset, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
		   count, 32);

BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
		   count, 32);

BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
		   type, 8);
BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
		   offset, 64);

static inline u32 btrfs_extent_inline_ref_size(int type)
{
	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
	    type == BTRFS_SHARED_BLOCK_REF_KEY)
		return sizeof(struct btrfs_extent_inline_ref);
	if (type == BTRFS_SHARED_DATA_REF_KEY)
		return sizeof(struct btrfs_shared_data_ref) +
		       sizeof(struct btrfs_extent_inline_ref);
	if (type == BTRFS_EXTENT_DATA_REF_KEY)
		return sizeof(struct btrfs_extent_data_ref) +
		       offsetof(struct btrfs_extent_inline_ref, offset);
	BUG();
	return 0;
}

BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
		   generation, 64);
BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
C
Chris Mason 已提交
1881

1882 1883
/* struct btrfs_node */
BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1884
BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
C
Chris Mason 已提交
1885

1886
static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
1887
{
1888 1889 1890 1891
	unsigned long ptr;
	ptr = offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
C
Chris Mason 已提交
1892 1893
}

1894 1895
static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
					   int nr, u64 val)
C
Chris Mason 已提交
1896
{
1897 1898 1899 1900
	unsigned long ptr;
	ptr = offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
C
Chris Mason 已提交
1901 1902
}

1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
{
	unsigned long ptr;
	ptr = offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
}

static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
						 int nr, u64 val)
{
	unsigned long ptr;
	ptr = offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
}

1920
static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1921
{
1922 1923
	return offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
1924 1925
}

1926 1927 1928
void btrfs_node_key(struct extent_buffer *eb,
		    struct btrfs_disk_key *disk_key, int nr);

1929 1930
static inline void btrfs_set_node_key(struct extent_buffer *eb,
				      struct btrfs_disk_key *disk_key, int nr)
1931
{
1932 1933 1934 1935
	unsigned long ptr;
	ptr = btrfs_node_key_ptr_offset(nr);
	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
		       struct btrfs_key_ptr, key, disk_key);
1936 1937
}

1938 1939 1940
/* struct btrfs_item */
BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1941

1942
static inline unsigned long btrfs_item_nr_offset(int nr)
1943
{
1944 1945
	return offsetof(struct btrfs_leaf, items) +
		sizeof(struct btrfs_item) * nr;
1946 1947
}

1948 1949
static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
					       int nr)
C
Chris Mason 已提交
1950
{
1951
	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
C
Chris Mason 已提交
1952 1953
}

1954 1955
static inline u32 btrfs_item_end(struct extent_buffer *eb,
				 struct btrfs_item *item)
C
Chris Mason 已提交
1956
{
1957
	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
C
Chris Mason 已提交
1958 1959
}

1960
static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
1961
{
1962
	return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
C
Chris Mason 已提交
1963 1964
}

1965
static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
1966
{
1967
	return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
C
Chris Mason 已提交
1968 1969
}

1970
static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
1971
{
1972
	return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
C
Chris Mason 已提交
1973 1974
}

1975 1976
static inline void btrfs_item_key(struct extent_buffer *eb,
			   struct btrfs_disk_key *disk_key, int nr)
1977
{
1978 1979
	struct btrfs_item *item = btrfs_item_nr(eb, nr);
	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1980 1981
}

1982 1983
static inline void btrfs_set_item_key(struct extent_buffer *eb,
			       struct btrfs_disk_key *disk_key, int nr)
1984
{
1985 1986
	struct btrfs_item *item = btrfs_item_nr(eb, nr);
	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1987 1988
}

1989 1990
BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);

1991 1992 1993 1994 1995 1996 1997
/*
 * struct btrfs_root_ref
 */
BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);

1998
/* struct btrfs_dir_item */
J
Josef Bacik 已提交
1999
BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2000 2001
BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2002
BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2003

2004 2005 2006
static inline void btrfs_dir_item_key(struct extent_buffer *eb,
				      struct btrfs_dir_item *item,
				      struct btrfs_disk_key *key)
2007
{
2008
	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2009 2010
}

2011 2012 2013
static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
					  struct btrfs_dir_item *item,
					  struct btrfs_disk_key *key)
2014
{
2015
	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2016 2017
}

2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
		   num_entries, 64);
BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
		   num_bitmaps, 64);
BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
		   generation, 64);

static inline void btrfs_free_space_key(struct extent_buffer *eb,
					struct btrfs_free_space_header *h,
					struct btrfs_disk_key *key)
{
	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
}

static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
					    struct btrfs_free_space_header *h,
					    struct btrfs_disk_key *key)
{
	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
}

2039 2040 2041 2042 2043
/* struct btrfs_disk_key */
BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
			 objectid, 64);
BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2044

C
Chris Mason 已提交
2045 2046 2047 2048
static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
					 struct btrfs_disk_key *disk)
{
	cpu->offset = le64_to_cpu(disk->offset);
2049
	cpu->type = disk->type;
C
Chris Mason 已提交
2050 2051 2052 2053 2054 2055 2056
	cpu->objectid = le64_to_cpu(disk->objectid);
}

static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
					 struct btrfs_key *cpu)
{
	disk->offset = cpu_to_le64(cpu->offset);
2057
	disk->type = cpu->type;
C
Chris Mason 已提交
2058 2059 2060
	disk->objectid = cpu_to_le64(cpu->objectid);
}

2061 2062
static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
				  struct btrfs_key *key, int nr)
2063
{
2064 2065 2066
	struct btrfs_disk_key disk_key;
	btrfs_node_key(eb, &disk_key, nr);
	btrfs_disk_key_to_cpu(key, &disk_key);
2067 2068
}

2069 2070
static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
				  struct btrfs_key *key, int nr)
2071
{
2072 2073 2074
	struct btrfs_disk_key disk_key;
	btrfs_item_key(eb, &disk_key, nr);
	btrfs_disk_key_to_cpu(key, &disk_key);
2075 2076
}

2077 2078 2079
static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
				      struct btrfs_dir_item *item,
				      struct btrfs_key *key)
2080
{
2081 2082 2083
	struct btrfs_disk_key disk_key;
	btrfs_dir_item_key(eb, item, &disk_key);
	btrfs_disk_key_to_cpu(key, &disk_key);
2084 2085
}

2086

2087
static inline u8 btrfs_key_type(struct btrfs_key *key)
2088
{
2089
	return key->type;
2090 2091
}

2092
static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2093
{
2094
	key->type = val;
2095 2096
}

2097
/* struct btrfs_header */
2098
BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2099 2100 2101 2102
BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
			  generation, 64);
BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2103
BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2104
BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2105

2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
{
	return (btrfs_header_flags(eb) & flag) == flag;
}

static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
{
	u64 flags = btrfs_header_flags(eb);
	btrfs_set_header_flags(eb, flags | flag);
	return (flags & flag) == flag;
}

static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
{
	u64 flags = btrfs_header_flags(eb);
	btrfs_set_header_flags(eb, flags & ~flag);
	return (flags & flag) == flag;
}

2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
{
	u64 flags = btrfs_header_flags(eb);
	return flags >> BTRFS_BACKREF_REV_SHIFT;
}

static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
						int rev)
{
	u64 flags = btrfs_header_flags(eb);
	flags &= ~BTRFS_BACKREF_REV_MASK;
	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
	btrfs_set_header_flags(eb, flags);
}

2140
static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
2141
{
2142 2143
	unsigned long ptr = offsetof(struct btrfs_header, fsid);
	return (u8 *)ptr;
2144 2145
}

2146 2147 2148 2149 2150 2151
static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
{
	unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
	return (u8 *)ptr;
}

2152
static inline int btrfs_is_leaf(struct extent_buffer *eb)
2153
{
C
Chris Mason 已提交
2154
	return btrfs_header_level(eb) == 0;
2155 2156
}

2157
/* struct btrfs_root_item */
2158 2159
BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
		   generation, 64);
2160
BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2161 2162
BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2163

2164 2165
BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
			 generation, 64);
2166 2167
BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2168 2169
BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2170
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2171 2172
BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
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Yan Zheng 已提交
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BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
			 last_snapshot, 64);
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static inline bool btrfs_root_readonly(struct btrfs_root *root)
{
	return root->root_item.flags & BTRFS_ROOT_SUBVOL_RDONLY;
}

C
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/* struct btrfs_root_backup */
BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
		   tree_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
		   tree_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
		   tree_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
		   chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
		   chunk_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
		   chunk_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
		   extent_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
		   extent_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
		   extent_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
		   fs_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
		   fs_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
		   fs_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
		   dev_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
		   dev_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
		   dev_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
		   csum_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
		   csum_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
		   csum_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
		   total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
		   bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
		   num_devices, 64);

2230 2231
/* struct btrfs_balance_item */
BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2232

2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309
static inline void btrfs_balance_data(struct extent_buffer *eb,
				      struct btrfs_balance_item *bi,
				      struct btrfs_disk_balance_args *ba)
{
	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
}

static inline void btrfs_set_balance_data(struct extent_buffer *eb,
					  struct btrfs_balance_item *bi,
					  struct btrfs_disk_balance_args *ba)
{
	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
}

static inline void btrfs_balance_meta(struct extent_buffer *eb,
				      struct btrfs_balance_item *bi,
				      struct btrfs_disk_balance_args *ba)
{
	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
}

static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
					  struct btrfs_balance_item *bi,
					  struct btrfs_disk_balance_args *ba)
{
	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
}

static inline void btrfs_balance_sys(struct extent_buffer *eb,
				     struct btrfs_balance_item *bi,
				     struct btrfs_disk_balance_args *ba)
{
	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
}

static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
					 struct btrfs_balance_item *bi,
					 struct btrfs_disk_balance_args *ba)
{
	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
}

static inline void
btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
			       struct btrfs_disk_balance_args *disk)
{
	memset(cpu, 0, sizeof(*cpu));

	cpu->profiles = le64_to_cpu(disk->profiles);
	cpu->usage = le64_to_cpu(disk->usage);
	cpu->devid = le64_to_cpu(disk->devid);
	cpu->pstart = le64_to_cpu(disk->pstart);
	cpu->pend = le64_to_cpu(disk->pend);
	cpu->vstart = le64_to_cpu(disk->vstart);
	cpu->vend = le64_to_cpu(disk->vend);
	cpu->target = le64_to_cpu(disk->target);
	cpu->flags = le64_to_cpu(disk->flags);
}

static inline void
btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
			       struct btrfs_balance_args *cpu)
{
	memset(disk, 0, sizeof(*disk));

	disk->profiles = cpu_to_le64(cpu->profiles);
	disk->usage = cpu_to_le64(cpu->usage);
	disk->devid = cpu_to_le64(cpu->devid);
	disk->pstart = cpu_to_le64(cpu->pstart);
	disk->pend = cpu_to_le64(cpu->pend);
	disk->vstart = cpu_to_le64(cpu->vstart);
	disk->vend = cpu_to_le64(cpu->vend);
	disk->target = cpu_to_le64(cpu->target);
	disk->flags = cpu_to_le64(cpu->flags);
}

/* struct btrfs_super_block */
2310
BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2311
BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2312 2313 2314
BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
			 generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2315 2316
BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
			 struct btrfs_super_block, sys_chunk_array_size, 32);
2317 2318
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
			 struct btrfs_super_block, chunk_root_generation, 64);
2319 2320
BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
			 root_level, 8);
2321 2322 2323
BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
			 chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2324 2325 2326
			 chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
			 log_root, 64);
2327 2328
BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
			 log_root_transid, 64);
2329 2330
BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
			 log_root_level, 8);
2331 2332 2333 2334
BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
			 total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
			 bytes_used, 64);
2335 2336 2337 2338 2339 2340
BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
			 sectorsize, 32);
BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
			 nodesize, 32);
BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
			 leafsize, 32);
2341 2342
BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
			 stripesize, 32);
2343 2344
BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
			 root_dir_objectid, 64);
2345 2346
BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
			 num_devices, 64);
2347 2348 2349
BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
			 compat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2350
			 compat_ro_flags, 64);
2351 2352
BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
			 incompat_flags, 64);
2353 2354
BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
			 csum_type, 16);
2355 2356
BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
			 cache_generation, 64);
2357 2358 2359 2360 2361 2362 2363

static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
{
	int t = btrfs_super_csum_type(s);
	BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
	return btrfs_csum_sizes[t];
}
2364

2365
static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2366
{
2367
	return offsetof(struct btrfs_leaf, items);
2368 2369
}

2370 2371
/* struct btrfs_file_extent_item */
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2372

C
Chris Mason 已提交
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static inline unsigned long
btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2375
{
2376
	unsigned long offset = (unsigned long)e;
2377
	offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2378
	return offset;
2379 2380 2381 2382
}

static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
{
2383
	return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2384 2385
}

2386 2387
BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
		   disk_bytenr, 64);
2388 2389
BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
		   generation, 64);
2390 2391
BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
		   disk_num_bytes, 64);
2392 2393
BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
		  offset, 64);
2394 2395
BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
		   num_bytes, 64);
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BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
		   ram_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
		   compression, 8);
BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
		   encryption, 8);
BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
		   other_encoding, 16);

/* this returns the number of file bytes represented by the inline item.
 * If an item is compressed, this is the uncompressed size
 */
static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
					       struct btrfs_file_extent_item *e)
{
	return btrfs_file_extent_ram_bytes(eb, e);
}

/*
 * this returns the number of bytes used by the item on disk, minus the
 * size of any extent headers.  If a file is compressed on disk, this is
 * the compressed size
 */
static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
						    struct btrfs_item *e)
{
	unsigned long offset;
	offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
	return btrfs_item_size(eb, e) - offset;
}
2426

2427
static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
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{
	return sb->s_fs_info;
}

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static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
{
2434 2435 2436 2437 2438
	if (level == 0)
		return root->leafsize;
	return root->nodesize;
}

2439 2440
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
C
Chris Mason 已提交
2441
	((type *)(btrfs_leaf_data(leaf) + \
2442 2443 2444 2445 2446
	btrfs_item_offset_nr(leaf, slot)))

#define btrfs_item_ptr_offset(leaf, slot) \
	((unsigned long)(btrfs_leaf_data(leaf) + \
	btrfs_item_offset_nr(leaf, slot)))
2447

2448 2449
static inline struct dentry *fdentry(struct file *file)
{
2450 2451 2452
	return file->f_path.dentry;
}

2453 2454 2455 2456 2457 2458
static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
{
	return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
		(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
}

2459 2460 2461 2462 2463
static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
{
	return mapping_gfp_mask(mapping) & ~__GFP_FS;
}

C
Chris Mason 已提交
2464
/* extent-tree.c */
2465
static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2466
						 unsigned num_items)
2467 2468 2469
{
	return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
		3 * num_items;
2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
}

/*
 * Doing a truncate won't result in new nodes or leaves, just what we need for
 * COW.
 */
static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
						 unsigned num_items)
{
	return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
		num_items;
2481 2482
}

2483
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2484 2485
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, unsigned long count);
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Zheng Yan 已提交
2486
int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2487 2488 2489
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, u64 bytenr,
			     u64 num_bytes, u64 *refs, u64 *flags);
2490 2491
int btrfs_pin_extent(struct btrfs_root *root,
		     u64 bytenr, u64 num, int reserved);
2492 2493 2494
int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
				    struct btrfs_root *root,
				    u64 bytenr, u64 num_bytes);
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Yan Zheng 已提交
2495
int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2496 2497
			  struct btrfs_root *root,
			  u64 objectid, u64 offset, u64 bytenr);
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struct btrfs_block_group_cache *btrfs_lookup_block_group(
						 struct btrfs_fs_info *info,
						 u64 bytenr);
2501
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2502 2503
u64 btrfs_find_block_group(struct btrfs_root *root,
			   u64 search_start, u64 search_hint, int owner);
2504
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2505 2506 2507
					struct btrfs_root *root, u32 blocksize,
					u64 parent, u64 root_objectid,
					struct btrfs_disk_key *key, int level,
2508
					u64 hint, u64 empty_size);
2509 2510 2511
void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   struct extent_buffer *buf,
2512
			   u64 parent, int last_ref);
2513 2514
struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
					    struct btrfs_root *root,
2515 2516
					    u64 bytenr, u32 blocksize,
					    int level);
2517 2518 2519 2520 2521 2522 2523 2524
int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
				     struct btrfs_root *root,
				     u64 root_objectid, u64 owner,
				     u64 offset, struct btrfs_key *ins);
int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root,
				   u64 root_objectid, u64 owner, u64 offset,
				   struct btrfs_key *ins);
2525 2526 2527 2528
int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
				  struct btrfs_root *root,
				  u64 num_bytes, u64 min_alloc_size,
				  u64 empty_size, u64 hint_byte,
2529
				  struct btrfs_key *ins, u64 data);
2530
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
A
Arne Jansen 已提交
2531
		  struct extent_buffer *buf, int full_backref, int for_cow);
2532
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
A
Arne Jansen 已提交
2533
		  struct extent_buffer *buf, int full_backref, int for_cow);
2534 2535 2536 2537
int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
				struct btrfs_root *root,
				u64 bytenr, u64 num_bytes, u64 flags,
				int is_data);
Z
Zheng Yan 已提交
2538 2539
int btrfs_free_extent(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root,
A
Arne Jansen 已提交
2540 2541
		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
		      u64 owner, u64 offset, int for_cow);
2542

2543
int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2544 2545
int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
				       u64 start, u64 len);
2546 2547
void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root);
C
Chris Mason 已提交
2548
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2549
			       struct btrfs_root *root);
C
Chris Mason 已提交
2550
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
Z
Zheng Yan 已提交
2551 2552
			 struct btrfs_root *root,
			 u64 bytenr, u64 num_bytes, u64 parent,
A
Arne Jansen 已提交
2553
			 u64 root_objectid, u64 owner, u64 offset, int for_cow);
2554

C
Chris Mason 已提交
2555 2556
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
				    struct btrfs_root *root);
2557
int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
C
Chris Mason 已提交
2558 2559
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
2560
int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2561 2562
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, u64 bytes_used,
2563
			   u64 type, u64 chunk_objectid, u64 chunk_offset,
2564
			   u64 size);
Z
Zheng Yan 已提交
2565 2566
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, u64 group_start);
Y
Yan Zheng 已提交
2567
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2568
u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
J
Josef Bacik 已提交
2569
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2570
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2571 2572
int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
2573 2574
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
				struct btrfs_root *root);
2575 2576 2577
int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
				  struct inode *inode);
void btrfs_orphan_release_metadata(struct inode *inode);
2578 2579
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
				struct btrfs_pending_snapshot *pending);
2580 2581 2582 2583
int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
2584 2585 2586 2587
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv);
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root);
void btrfs_free_block_rsv(struct btrfs_root *root,
			  struct btrfs_block_rsv *rsv);
2588
int btrfs_block_rsv_add(struct btrfs_root *root,
2589
			struct btrfs_block_rsv *block_rsv,
2590
			u64 num_bytes);
2591 2592 2593
int btrfs_block_rsv_add_noflush(struct btrfs_root *root,
				struct btrfs_block_rsv *block_rsv,
				u64 num_bytes);
2594
int btrfs_block_rsv_check(struct btrfs_root *root,
2595 2596
			  struct btrfs_block_rsv *block_rsv, int min_factor);
int btrfs_block_rsv_refill(struct btrfs_root *root,
2597
			  struct btrfs_block_rsv *block_rsv,
2598
			  u64 min_reserved);
2599 2600 2601
int btrfs_block_rsv_refill_noflush(struct btrfs_root *root,
				   struct btrfs_block_rsv *block_rsv,
				   u64 min_reserved);
2602 2603 2604 2605 2606 2607 2608 2609
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
			    struct btrfs_block_rsv *dst_rsv,
			    u64 num_bytes);
void btrfs_block_rsv_release(struct btrfs_root *root,
			     struct btrfs_block_rsv *block_rsv,
			     u64 num_bytes);
int btrfs_set_block_group_ro(struct btrfs_root *root,
			     struct btrfs_block_group_cache *cache);
2610 2611
void btrfs_set_block_group_rw(struct btrfs_root *root,
			      struct btrfs_block_group_cache *cache);
2612
void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2613
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
L
liubo 已提交
2614 2615 2616
int btrfs_error_unpin_extent_range(struct btrfs_root *root,
				   u64 start, u64 end);
int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
2617
			       u64 num_bytes, u64 *actual_bytes);
2618 2619
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root, u64 type);
2620
int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
L
liubo 已提交
2621

2622
int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
C
Chris Mason 已提交
2623
/* ctree.c */
2624 2625 2626
int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
		     int level, int *slot);
int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2627 2628 2629
int btrfs_previous_item(struct btrfs_root *root,
			struct btrfs_path *path, u64 min_objectid,
			int type);
2630 2631 2632
void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, struct btrfs_path *path,
			     struct btrfs_key *new_key);
2633 2634
struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2635
int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2636 2637 2638
			struct btrfs_key *key, int lowest_level,
			int cache_only, u64 min_trans);
int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2639
			 struct btrfs_key *max_key,
2640 2641
			 struct btrfs_path *path, int cache_only,
			 u64 min_trans);
2642 2643 2644
int btrfs_cow_block(struct btrfs_trans_handle *trans,
		    struct btrfs_root *root, struct extent_buffer *buf,
		    struct extent_buffer *parent, int parent_slot,
2645
		    struct extent_buffer **cow_ret);
2646 2647 2648 2649
int btrfs_copy_root(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root,
		      struct extent_buffer *buf,
		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2650 2651
int btrfs_block_can_be_shared(struct btrfs_root *root,
			      struct extent_buffer *buf);
2652 2653 2654 2655 2656 2657 2658
void btrfs_extend_item(struct btrfs_trans_handle *trans,
		       struct btrfs_root *root, struct btrfs_path *path,
		       u32 data_size);
void btrfs_truncate_item(struct btrfs_trans_handle *trans,
			 struct btrfs_root *root,
			 struct btrfs_path *path,
			 u32 new_size, int from_end);
2659 2660 2661 2662 2663
int btrfs_split_item(struct btrfs_trans_handle *trans,
		     struct btrfs_root *root,
		     struct btrfs_path *path,
		     struct btrfs_key *new_key,
		     unsigned long split_offset);
Y
Yan, Zheng 已提交
2664 2665 2666 2667
int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
			 struct btrfs_root *root,
			 struct btrfs_path *path,
			 struct btrfs_key *new_key);
2668 2669 2670
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
		      *root, struct btrfs_key *key, struct btrfs_path *p, int
		      ins_len, int cow);
2671
int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2672
		       struct btrfs_root *root, struct extent_buffer *parent,
2673 2674
		       int start_slot, int cache_only, u64 *last_ret,
		       struct btrfs_key *progress);
2675
void btrfs_release_path(struct btrfs_path *p);
C
Chris Mason 已提交
2676 2677
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
2678
void btrfs_set_path_blocking(struct btrfs_path *p);
2679
void btrfs_clear_path_blocking(struct btrfs_path *p,
2680
			       struct extent_buffer *held, int held_rw);
2681 2682
void btrfs_unlock_up_safe(struct btrfs_path *p, int level);

2683 2684 2685 2686 2687 2688 2689 2690 2691
int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
		   struct btrfs_path *path, int slot, int nr);
static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path)
{
	return btrfs_del_items(trans, root, path, path->slots[0], 1);
}

2692 2693 2694 2695
void setup_items_for_insert(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root, struct btrfs_path *path,
			    struct btrfs_key *cpu_key, u32 *data_size,
			    u32 total_data, u32 total_size, int nr);
2696 2697
int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
		      *root, struct btrfs_key *key, void *data, u32 data_size);
2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711
int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path,
			     struct btrfs_key *cpu_key, u32 *data_size, int nr);

static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path,
					  struct btrfs_key *key,
					  u32 data_size)
{
	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
}

C
Chris Mason 已提交
2712
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2713 2714 2715 2716 2717 2718 2719
static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
{
	++p->slots[0];
	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
		return btrfs_next_leaf(root, p);
	return 0;
}
2720
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2721
int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2722 2723 2724
int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
				     struct btrfs_block_rsv *block_rsv,
				     int update_ref, int for_reloc);
Y
Yan Zheng 已提交
2725 2726 2727 2728
int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct extent_buffer *node,
			struct extent_buffer *parent);
2729 2730 2731 2732 2733 2734 2735 2736
static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
{
	/*
	 * Get synced with close_ctree()
	 */
	smp_mb();
	return fs_info->closing;
}
2737 2738
static inline void free_fs_info(struct btrfs_fs_info *fs_info)
{
2739
	kfree(fs_info->balance_ctl);
2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
	kfree(fs_info->delayed_root);
	kfree(fs_info->extent_root);
	kfree(fs_info->tree_root);
	kfree(fs_info->chunk_root);
	kfree(fs_info->dev_root);
	kfree(fs_info->csum_root);
	kfree(fs_info->super_copy);
	kfree(fs_info->super_for_commit);
	kfree(fs_info);
}
2750

C
Chris Mason 已提交
2751
/* root-item.c */
2752
int btrfs_find_root_ref(struct btrfs_root *tree_root,
2753 2754
			struct btrfs_path *path,
			u64 root_id, u64 ref_id);
2755 2756
int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
		       struct btrfs_root *tree_root,
2757 2758 2759 2760 2761
		       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
		       const char *name, int name_len);
int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
		       struct btrfs_root *tree_root,
		       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2762
		       const char *name, int name_len);
2763 2764 2765 2766 2767
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
		   struct btrfs_key *key);
int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
		      *root, struct btrfs_key *key, struct btrfs_root_item
		      *item);
2768 2769 2770 2771
int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root,
				   struct btrfs_key *key,
				   struct btrfs_root_item *item);
2772 2773
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
			 btrfs_root_item *item, struct btrfs_key *key);
2774
int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2775
int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2776 2777
void btrfs_set_root_node(struct btrfs_root_item *item,
			 struct extent_buffer *node);
2778 2779
void btrfs_check_and_init_root_item(struct btrfs_root_item *item);

C
Chris Mason 已提交
2780
/* dir-item.c */
C
Chris Mason 已提交
2781 2782
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, const char *name,
2783
			  int name_len, struct inode *dir,
2784
			  struct btrfs_key *location, u8 type, u64 index);
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795
struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
					     struct btrfs_root *root,
					     struct btrfs_path *path, u64 dir,
					     const char *name, int name_len,
					     int mod);
struct btrfs_dir_item *
btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root,
			    struct btrfs_path *path, u64 dir,
			    u64 objectid, const char *name, int name_len,
			    int mod);
2796 2797 2798 2799
struct btrfs_dir_item *
btrfs_search_dir_index_item(struct btrfs_root *root,
			    struct btrfs_path *path, u64 dirid,
			    const char *name, int name_len);
2800 2801
struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
			      struct btrfs_path *path,
2802
			      const char *name, int name_len);
2803 2804 2805 2806
int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root,
			      struct btrfs_path *path,
			      struct btrfs_dir_item *di);
J
Josef Bacik 已提交
2807
int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2808 2809 2810 2811
			    struct btrfs_root *root,
			    struct btrfs_path *path, u64 objectid,
			    const char *name, u16 name_len,
			    const void *data, u16 data_len);
J
Josef Bacik 已提交
2812 2813 2814 2815 2816
struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path, u64 dir,
					  const char *name, u16 name_len,
					  int mod);
2817 2818 2819
int verify_dir_item(struct btrfs_root *root,
		    struct extent_buffer *leaf,
		    struct btrfs_dir_item *dir_item);
2820 2821 2822 2823 2824 2825

/* orphan.c */
int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, u64 offset);
int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, u64 offset);
2826
int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2827

C
Chris Mason 已提交
2828
/* inode-item.c */
2829 2830 2831
int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   const char *name, int name_len,
2832
			   u64 inode_objectid, u64 ref_objectid, u64 index);
2833 2834 2835
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   const char *name, int name_len,
2836
			   u64 inode_objectid, u64 ref_objectid, u64 *index);
2837 2838 2839 2840 2841 2842
struct btrfs_inode_ref *
btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct btrfs_path *path,
			const char *name, int name_len,
			u64 inode_objectid, u64 ref_objectid, int mod);
2843 2844 2845
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid);
2846
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2847 2848
		       *root, struct btrfs_path *path,
		       struct btrfs_key *location, int mod);
C
Chris Mason 已提交
2849 2850

/* file-item.c */
2851 2852
int btrfs_del_csums(struct btrfs_trans_handle *trans,
		    struct btrfs_root *root, u64 bytenr, u64 len);
2853
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2854
			  struct bio *bio, u32 *dst);
2855 2856
int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
			      struct bio *bio, u64 logical_offset, u32 *dst);
C
Chris Mason 已提交
2857
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
C
Chris Mason 已提交
2858 2859 2860 2861 2862
			     struct btrfs_root *root,
			     u64 objectid, u64 pos,
			     u64 disk_offset, u64 disk_num_bytes,
			     u64 num_bytes, u64 offset, u64 ram_bytes,
			     u8 compression, u8 encryption, u16 other_encoding);
C
Chris Mason 已提交
2863 2864 2865
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid,
2866
			     u64 bytenr, int mod);
2867
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2868
			   struct btrfs_root *root,
2869
			   struct btrfs_ordered_sum *sums);
2870
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2871
		       struct bio *bio, u64 file_start, int contig);
C
Chris Mason 已提交
2872 2873 2874
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path,
2875
					  u64 bytenr, int cow);
C
Chris Mason 已提交
2876 2877 2878
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
			struct btrfs_root *root, struct btrfs_path *path,
			u64 isize);
A
Arne Jansen 已提交
2879 2880
int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
			     struct list_head *list, int search_commit);
C
Chris Mason 已提交
2881
/* inode.c */
J
Josef Bacik 已提交
2882 2883 2884
struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
					   size_t pg_offset, u64 start, u64 len,
					   int create);
2885 2886

/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2887
#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2888 2889 2890 2891 2892
#define ClearPageChecked ClearPageFsMisc
#define SetPageChecked SetPageFsMisc
#define PageChecked PageFsMisc
#endif

L
Li Zefan 已提交
2893 2894 2895 2896 2897 2898 2899 2900
/* This forces readahead on a given range of bytes in an inode */
static inline void btrfs_force_ra(struct address_space *mapping,
				  struct file_ra_state *ra, struct file *file,
				  pgoff_t offset, unsigned long req_size)
{
	page_cache_sync_readahead(mapping, ra, file, offset, req_size);
}

2901 2902
struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
int btrfs_set_inode_index(struct inode *dir, u64 *index);
2903 2904 2905 2906 2907 2908 2909
int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
		       struct btrfs_root *root,
		       struct inode *dir, struct inode *inode,
		       const char *name, int name_len);
int btrfs_add_link(struct btrfs_trans_handle *trans,
		   struct inode *parent_inode, struct inode *inode,
		   const char *name, int name_len, int add_backref, u64 index);
2910 2911 2912 2913
int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct inode *dir, u64 objectid,
			const char *name, int name_len);
2914 2915 2916 2917 2918
int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root,
			       struct inode *inode, u64 new_size,
			       u32 min_type);

Y
Yan, Zheng 已提交
2919
int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
2920 2921
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
			      struct extent_state **cached_state);
2922 2923
int btrfs_writepages(struct address_space *mapping,
		     struct writeback_control *wbc);
2924
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2925
			     struct btrfs_root *new_root, u64 new_dirid);
2926
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
C
Chris Mason 已提交
2927
			 size_t size, struct bio *bio, unsigned long bio_flags);
2928

2929
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
C
Chris Mason 已提交
2930
int btrfs_readpage(struct file *file, struct page *page);
A
Al Viro 已提交
2931
void btrfs_evict_inode(struct inode *inode);
2932
int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
2933 2934
int btrfs_dirty_inode(struct inode *inode);
int btrfs_update_time(struct file *file);
C
Chris Mason 已提交
2935 2936
struct inode *btrfs_alloc_inode(struct super_block *sb);
void btrfs_destroy_inode(struct inode *inode);
2937
int btrfs_drop_inode(struct inode *inode);
C
Chris Mason 已提交
2938 2939
int btrfs_init_cachep(void);
void btrfs_destroy_cachep(void);
S
Sage Weil 已提交
2940
long btrfs_ioctl_trans_end(struct file *file);
B
Balaji Rao 已提交
2941
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2942
			 struct btrfs_root *root, int *was_new);
2943
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2944
				    size_t pg_offset, u64 start, u64 end,
2945 2946 2947 2948
				    int create);
int btrfs_update_inode(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root,
			      struct inode *inode);
2949 2950
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2951
int btrfs_orphan_cleanup(struct btrfs_root *root);
2952 2953
void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root);
2954
int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
2955
void btrfs_invalidate_inodes(struct btrfs_root *root);
Y
Yan, Zheng 已提交
2956 2957
void btrfs_add_delayed_iput(struct inode *inode);
void btrfs_run_delayed_iputs(struct btrfs_root *root);
2958 2959 2960
int btrfs_prealloc_file_range(struct inode *inode, int mode,
			      u64 start, u64 num_bytes, u64 min_size,
			      loff_t actual_len, u64 *alloc_hint);
2961 2962 2963 2964
int btrfs_prealloc_file_range_trans(struct inode *inode,
				    struct btrfs_trans_handle *trans, int mode,
				    u64 start, u64 num_bytes, u64 min_size,
				    loff_t actual_len, u64 *alloc_hint);
2965
extern const struct dentry_operations btrfs_dentry_operations;
C
Christoph Hellwig 已提交
2966 2967 2968

/* ioctl.c */
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2969 2970
void btrfs_update_iflags(struct inode *inode);
void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
C
Chris Mason 已提交
2971 2972 2973
int btrfs_defrag_file(struct inode *inode, struct file *file,
		      struct btrfs_ioctl_defrag_range_args *range,
		      u64 newer_than, unsigned long max_pages);
C
Chris Mason 已提交
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/* file.c */
C
Chris Mason 已提交
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int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
			   struct inode *inode);
int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
2978
int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
2979 2980
int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
			    int skip_pinned);
2981
extern const struct file_operations btrfs_file_operations;
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Yan, Zheng 已提交
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int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
		       u64 start, u64 end, u64 *hint_byte, int drop_cache);
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Yan Zheng 已提交
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int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
			      struct inode *inode, u64 start, u64 end);
S
Sage Weil 已提交
2986
int btrfs_release_file(struct inode *inode, struct file *file);
2987 2988 2989 2990 2991
void btrfs_drop_pages(struct page **pages, size_t num_pages);
int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
		      struct page **pages, size_t num_pages,
		      loff_t pos, size_t write_bytes,
		      struct extent_state **cached);
S
Sage Weil 已提交
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2993 2994 2995
/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
			struct btrfs_root *root, int cache_only);
2996 2997 2998 2999 3000

/* sysfs.c */
int btrfs_init_sysfs(void);
void btrfs_exit_sysfs(void);

J
Josef Bacik 已提交
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/* xattr.c */
ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
J
Josef Bacik 已提交
3003

3004
/* super.c */
3005
int btrfs_parse_options(struct btrfs_root *root, char *options);
S
Sage Weil 已提交
3006
int btrfs_sync_fs(struct super_block *sb, int wait);
J
Jeff Mahoney 已提交
3007
void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
L
liubo 已提交
3008
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
J
Jeff Mahoney 已提交
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		     unsigned int line, int errno, const char *fmt, ...);
L
liubo 已提交
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3011 3012 3013 3014 3015 3016 3017 3018 3019
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, const char *function,
			       unsigned int line, int errno);

#define btrfs_abort_transaction(trans, root, errno)		\
do {								\
	__btrfs_abort_transaction(trans, root, __func__,	\
				  __LINE__, errno);		\
} while (0)
L
liubo 已提交
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#define btrfs_std_error(fs_info, errno)				\
do {								\
	if ((errno))						\
J
Jeff Mahoney 已提交
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		__btrfs_std_error((fs_info), __func__,		\
				   __LINE__, (errno), NULL);	\
} while (0)

#define btrfs_error(fs_info, errno, fmt, args...)		\
do {								\
	__btrfs_std_error((fs_info), __func__, __LINE__,	\
			  (errno), fmt, ##args);		\
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liubo 已提交
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} while (0)
J
Josef Bacik 已提交
3033

J
Jeff Mahoney 已提交
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void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
		   unsigned int line, int errno, const char *fmt, ...);

#define btrfs_panic(fs_info, errno, fmt, args...)			\
do {									\
	struct btrfs_fs_info *_i = (fs_info);				\
	__btrfs_panic(_i, __func__, __LINE__, errno, fmt, ##args);	\
	BUG_ON(!(_i->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR));	\
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liubo 已提交
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} while (0)
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Josef Bacik 已提交
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/* acl.c */
C
Chris Mason 已提交
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#ifdef CONFIG_BTRFS_FS_POSIX_ACL
3046
struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3047 3048
int btrfs_init_acl(struct btrfs_trans_handle *trans,
		   struct inode *inode, struct inode *dir);
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Josef Bacik 已提交
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int btrfs_acl_chmod(struct inode *inode);
3050
#else
3051
#define btrfs_get_acl NULL
3052 3053 3054 3055 3056 3057 3058 3059 3060 3061
static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
				 struct inode *inode, struct inode *dir)
{
	return 0;
}
static inline int btrfs_acl_chmod(struct inode *inode)
{
	return 0;
}
#endif
J
Josef Bacik 已提交
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3063 3064 3065 3066 3067 3068 3069 3070
/* relocation.c */
int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root);
int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root);
int btrfs_recover_relocation(struct btrfs_root *root);
int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3071 3072 3073 3074 3075 3076
void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, struct extent_buffer *buf,
			   struct extent_buffer *cow);
void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
			      struct btrfs_pending_snapshot *pending,
			      u64 *bytes_to_reserve);
3077
int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3078
			      struct btrfs_pending_snapshot *pending);
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Arne Jansen 已提交
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/* scrub.c */
int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
A
Arne Jansen 已提交
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		    struct btrfs_scrub_progress *progress, int readonly);
3083 3084 3085 3086
void btrfs_scrub_pause(struct btrfs_root *root);
void btrfs_scrub_pause_super(struct btrfs_root *root);
void btrfs_scrub_continue(struct btrfs_root *root);
void btrfs_scrub_continue_super(struct btrfs_root *root);
3087
int __btrfs_scrub_cancel(struct btrfs_fs_info *info);
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Arne Jansen 已提交
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int btrfs_scrub_cancel(struct btrfs_root *root);
int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev);
int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
			 struct btrfs_scrub_progress *progress);

3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109
/* reada.c */
struct reada_control {
	struct btrfs_root	*root;		/* tree to prefetch */
	struct btrfs_key	key_start;
	struct btrfs_key	key_end;	/* exclusive */
	atomic_t		elems;
	struct kref		refcnt;
	wait_queue_head_t	wait;
};
struct reada_control *btrfs_reada_add(struct btrfs_root *root,
			      struct btrfs_key *start, struct btrfs_key *end);
int btrfs_reada_wait(void *handle);
void btrfs_reada_detach(void *handle);
int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
			 u64 start, int err);

3110 3111 3112 3113 3114 3115 3116
/* delayed seq elem */
struct seq_list {
	struct list_head list;
	u64 seq;
	u32 flags;
};

3117
#endif