ctree.h 129.2 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/semaphore.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 <linux/btrfs.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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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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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
#define STATIC noinline
#else
#define STATIC static noinline
#endif

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#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
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#define BTRFS_MAX_MIRRORS 3
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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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/* holds quota configuration and tracking */
#define BTRFS_QUOTA_TREE_OBJECTID 8ULL

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/* for storing items that use the BTRFS_UUID_KEY* types */
#define BTRFS_UUID_TREE_OBJECTID 9ULL

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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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/*
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 * The inode number assigned to the special inode for storing
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 * 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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#define BTRFS_DEV_REPLACE_DEVID 0ULL
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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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/*
 * Theoretical limit is larger, but we keep this down to a sane
 * value. That should limit greatly the possibility of collisions on
 * inode ref items.
 */
#define BTRFS_LINK_MAX 65535U

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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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/* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
#define REQ_GET_READ_MIRRORS	(1 << 30)

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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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/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))

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#define BTRFS_DIRTY_METADATA_THRESH	(32 * 1024 * 1024)

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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
 */
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#define BTRFS_FS_STATE_ERROR		0
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#define BTRFS_FS_STATE_REMOUNTING	1
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#define BTRFS_FS_STATE_TRANS_ABORTED	2
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/* Super block flags */
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/* 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 */
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	__le64 unused_64[4];
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	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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	__le64 uuid_tree_generation;
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	/* future expansion */
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	__le64 reserved[30];
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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_INCOMPAT_EXTENDED_IREF	(1ULL << 6)
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#define BTRFS_FEATURE_INCOMPAT_RAID56		(1ULL << 7)
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#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA	(1ULL << 8)
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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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	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
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	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
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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 {
614
	__le32 refs;
615 616
} __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;
652
	__le64 offset;
653 654 655 656
} __attribute__ ((__packed__));

/* old style backrefs item */
struct btrfs_extent_ref_v0 {
657 658 659
	__le64 root;
	__le64 generation;
	__le64 objectid;
660
	__le32 count;
661 662
} __attribute__ ((__packed__));

663

664 665
/* dev extents record free space on individual devices.  The owner
 * field points back to the chunk allocation mapping tree that allocated
666
 * the extent.  The chunk tree uuid field is a way to double check the owner
667 668
 */
struct btrfs_dev_extent {
669 670 671
	__le64 chunk_tree;
	__le64 chunk_objectid;
	__le64 chunk_offset;
672
	__le64 length;
673
	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
674 675
} __attribute__ ((__packed__));

676
struct btrfs_inode_ref {
677
	__le64 index;
678 679 680 681
	__le16 name_len;
	/* name goes here */
} __attribute__ ((__packed__));

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struct btrfs_inode_extref {
	__le64 parent_objectid;
	__le64 index;
	__le16 name_len;
	__u8   name[0];
	/* name goes here */
} __attribute__ ((__packed__));

690
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 {
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	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 {
704
	/* nfs style generation number */
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	__le64 generation;
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	/* transid that last touched this inode */
	__le64 transid;
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	__le64 size;
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	__le64 nbytes;
710
	__le64 block_group;
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	__le32 nlink;
	__le32 uid;
	__le32 gid;
	__le32 mode;
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	__le64 rdev;
716
	__le64 flags;
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	/* 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];
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	struct btrfs_timespec atime;
	struct btrfs_timespec ctime;
	struct btrfs_timespec mtime;
	struct btrfs_timespec otime;
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} __attribute__ ((__packed__));

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struct btrfs_dir_log_item {
	__le64 end;
} __attribute__ ((__packed__));

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struct btrfs_dir_item {
737
	struct btrfs_disk_key location;
738
	__le64 transid;
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	__le16 data_len;
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	__le16 name_len;
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	u8 type;
} __attribute__ ((__packed__));

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#define BTRFS_ROOT_SUBVOL_RDONLY	(1ULL << 0)

746
struct btrfs_root_item {
747
	struct btrfs_inode_item inode;
748
	__le64 generation;
749
	__le64 root_dirid;
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	__le64 bytenr;
	__le64 byte_limit;
	__le64 bytes_used;
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	__le64 last_snapshot;
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	__le64 flags;
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	__le32 refs;
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	struct btrfs_disk_key drop_progress;
	u8 drop_level;
758
	u8 level;
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	/*
	 * The following fields appear after subvol_uuids+subvol_times
	 * were introduced.
	 */

	/*
	 * This generation number is used to test if the new fields are valid
	 * and up to date while reading the root item. Everytime the root item
	 * is written out, the "generation" field is copied into this field. If
	 * anyone ever mounted the fs with an older kernel, we will have
	 * mismatching generation values here and thus must invalidate the
	 * new fields. See btrfs_update_root and btrfs_find_last_root for
	 * details.
	 * the offset of generation_v2 is also used as the start for the memset
	 * when invalidating the fields.
	 */
	__le64 generation_v2;
	u8 uuid[BTRFS_UUID_SIZE];
	u8 parent_uuid[BTRFS_UUID_SIZE];
	u8 received_uuid[BTRFS_UUID_SIZE];
	__le64 ctransid; /* updated when an inode changes */
	__le64 otransid; /* trans when created */
	__le64 stransid; /* trans when sent. non-zero for received subvol */
	__le64 rtransid; /* trans when received. non-zero for received subvol */
	struct btrfs_timespec ctime;
	struct btrfs_timespec otime;
	struct btrfs_timespec stime;
	struct btrfs_timespec rtime;
	__le64 reserved[8]; /* for future */
789
} __attribute__ ((__packed__));
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791 792 793 794 795 796 797 798 799
/*
 * this is used for both forward and backward root refs
 */
struct btrfs_root_ref {
	__le64 dirid;
	__le64 sequence;
	__le16 name_len;
} __attribute__ ((__packed__));

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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
851

852
struct btrfs_file_extent_item {
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	/*
	 * transaction id that created this extent
	 */
856
	__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? */
878
	u8 type;
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880 881 882 883
	/*
	 * disk space consumed by the extent, checksum blocks are included
	 * in these numbers
	 */
884 885
	__le64 disk_bytenr;
	__le64 disk_num_bytes;
886
	/*
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	 * the logical offset in file blocks (no csums)
888 889 890 891 892 893 894
	 * 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.
897
	 */
898
	__le64 num_bytes;
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900 901
} __attribute__ ((__packed__));

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struct btrfs_csum_item {
903
	u8 csum;
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} __attribute__ ((__packed__));

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struct btrfs_dev_stats_item {
	/*
	 * grow this item struct at the end for future enhancements and keep
	 * the existing values unchanged
	 */
	__le64 values[BTRFS_DEV_STAT_VALUES_MAX];
} __attribute__ ((__packed__));

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#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS	0
#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID	1
#define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED	0
#define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED		1
#define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED		2
#define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED		3
#define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED		4

struct btrfs_dev_replace {
	u64 replace_state;	/* see #define above */
	u64 time_started;	/* seconds since 1-Jan-1970 */
	u64 time_stopped;	/* seconds since 1-Jan-1970 */
	atomic64_t num_write_errors;
	atomic64_t num_uncorrectable_read_errors;

	u64 cursor_left;
	u64 committed_cursor_left;
	u64 cursor_left_last_write_of_item;
	u64 cursor_right;

	u64 cont_reading_from_srcdev_mode;	/* see #define above */

	int is_valid;
	int item_needs_writeback;
	struct btrfs_device *srcdev;
	struct btrfs_device *tgtdev;

	pid_t lock_owner;
	atomic_t nesting_level;
	struct mutex lock_finishing_cancel_unmount;
	struct mutex lock_management_lock;
	struct mutex lock;

	struct btrfs_scrub_progress scrub_progress;
};

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
struct btrfs_dev_replace_item {
	/*
	 * grow this item struct at the end for future enhancements and keep
	 * the existing values unchanged
	 */
	__le64 src_devid;
	__le64 cursor_left;
	__le64 cursor_right;
	__le64 cont_reading_from_srcdev_mode;

	__le64 replace_state;
	__le64 time_started;
	__le64 time_stopped;
	__le64 num_write_errors;
	__le64 num_uncorrectable_read_errors;
} __attribute__ ((__packed__));

967
/* different types of block groups (and chunks) */
968 969 970 971 972 973 974
#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)
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#define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
#define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
977
#define BTRFS_BLOCK_GROUP_RESERVED	BTRFS_AVAIL_ALLOC_BIT_SINGLE
978 979 980 981 982 983 984

enum btrfs_raid_types {
	BTRFS_RAID_RAID10,
	BTRFS_RAID_RAID1,
	BTRFS_RAID_DUP,
	BTRFS_RAID_RAID0,
	BTRFS_RAID_SINGLE,
985 986
	BTRFS_RAID_RAID5,
	BTRFS_RAID_RAID6,
987 988
	BTRFS_NR_RAID_TYPES
};
989 990 991 992 993 994 995

#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 |   \
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					 BTRFS_BLOCK_GROUP_RAID5 |   \
					 BTRFS_BLOCK_GROUP_RAID6 |   \
998 999
					 BTRFS_BLOCK_GROUP_DUP |     \
					 BTRFS_BLOCK_GROUP_RAID10)
1000 1001 1002 1003 1004 1005 1006 1007 1008
/*
 * 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)

1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
#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;
1026 1027
	__le64 chunk_objectid;
	__le64 flags;
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} __attribute__ ((__packed__));

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/*
 * is subvolume quota turned on?
 */
#define BTRFS_QGROUP_STATUS_FLAG_ON		(1ULL << 0)
/*
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 * RESCAN is set during the initialization phase
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 */
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#define BTRFS_QGROUP_STATUS_FLAG_RESCAN		(1ULL << 1)
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/*
 * Some qgroup entries are known to be out of date,
 * either because the configuration has changed in a way that
 * makes a rescan necessary, or because the fs has been mounted
 * with a non-qgroup-aware version.
 * Turning qouta off and on again makes it inconsistent, too.
 */
#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT	(1ULL << 2)

#define BTRFS_QGROUP_STATUS_VERSION        1

struct btrfs_qgroup_status_item {
	__le64 version;
	/*
	 * the generation is updated during every commit. As older
	 * versions of btrfs are not aware of qgroups, it will be
	 * possible to detect inconsistencies by checking the
	 * generation on mount time
	 */
	__le64 generation;

	/* flag definitions see above */
	__le64 flags;

	/*
	 * only used during scanning to record the progress
	 * of the scan. It contains a logical address
	 */
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	__le64 rescan;
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} __attribute__ ((__packed__));

struct btrfs_qgroup_info_item {
	__le64 generation;
	__le64 rfer;
	__le64 rfer_cmpr;
	__le64 excl;
	__le64 excl_cmpr;
} __attribute__ ((__packed__));

/* flags definition for qgroup limits */
#define BTRFS_QGROUP_LIMIT_MAX_RFER	(1ULL << 0)
#define BTRFS_QGROUP_LIMIT_MAX_EXCL	(1ULL << 1)
#define BTRFS_QGROUP_LIMIT_RSV_RFER	(1ULL << 2)
#define BTRFS_QGROUP_LIMIT_RSV_EXCL	(1ULL << 3)
#define BTRFS_QGROUP_LIMIT_RFER_CMPR	(1ULL << 4)
#define BTRFS_QGROUP_LIMIT_EXCL_CMPR	(1ULL << 5)

struct btrfs_qgroup_limit_item {
	/*
	 * only updated when any of the other values change
	 */
	__le64 flags;
	__le64 max_rfer;
	__le64 max_excl;
	__le64 rsv_rfer;
	__le64 rsv_excl;
} __attribute__ ((__packed__));

1096 1097
struct btrfs_space_info {
	u64 flags;
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1099 1100
	u64 total_bytes;	/* total bytes in the space,
				   this doesn't take mirrors into account */
1101
	u64 bytes_used;		/* total bytes used,
1102
				   this doesn't take mirrors into account */
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1103 1104 1105 1106 1107
	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 */
1108

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	u64 bytes_may_use;	/* number of bytes that may be used for
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				   delalloc/allocations */
1111
	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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1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
	/*
	 * bytes_pinned is kept in line with what is actually pinned, as in
	 * we've called update_block_group and dropped the bytes_used counter
	 * and increased the bytes_pinned counter.  However this means that
	 * bytes_pinned does not reflect the bytes that will be pinned once the
	 * delayed refs are flushed, so this counter is inc'ed everytime we call
	 * btrfs_free_extent so it is a realtime count of what will be freed
	 * once the transaction is committed.  It will be zero'ed everytime the
	 * transaction commits.
	 */
	struct percpu_counter total_bytes_pinned;

1127
	unsigned int full:1;	/* indicates that we cannot allocate any more
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				   chunks for this space */
1129
	unsigned int chunk_alloc:1;	/* set if we are allocating a chunk */
1130

1131 1132
	unsigned int flush:1;		/* set if we are trying to make space */

1133 1134
	unsigned int force_alloc;	/* set if we need to force a chunk
					   alloc for this space */
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1136
	struct list_head list;
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	/* for block groups in our same type */
1139
	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
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	spinlock_t lock;
1141
	struct rw_semaphore groups_sem;
1142
	wait_queue_head_t wait;
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1143 1144
};

1145 1146 1147 1148 1149 1150 1151 1152
#define	BTRFS_BLOCK_RSV_GLOBAL		1
#define	BTRFS_BLOCK_RSV_DELALLOC	2
#define	BTRFS_BLOCK_RSV_TRANS		3
#define	BTRFS_BLOCK_RSV_CHUNK		4
#define	BTRFS_BLOCK_RSV_DELOPS		5
#define	BTRFS_BLOCK_RSV_EMPTY		6
#define	BTRFS_BLOCK_RSV_TEMP		7

1153 1154 1155 1156 1157
struct btrfs_block_rsv {
	u64 size;
	u64 reserved;
	struct btrfs_space_info *space_info;
	spinlock_t lock;
1158 1159 1160
	unsigned short full;
	unsigned short type;
	unsigned short failfast;
1161 1162
};

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
/*
 * 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;
1186 1187
};

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enum btrfs_caching_type {
	BTRFS_CACHE_NO		= 0,
	BTRFS_CACHE_STARTED	= 1,
1191 1192
	BTRFS_CACHE_FAST	= 2,
	BTRFS_CACHE_FINISHED	= 3,
1193
	BTRFS_CACHE_ERROR	= 4,
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1194 1195
};

1196 1197 1198 1199 1200 1201 1202 1203
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,
};

1204 1205 1206 1207
struct btrfs_caching_control {
	struct list_head list;
	struct mutex mutex;
	wait_queue_head_t wait;
1208
	struct btrfs_work work;
1209 1210 1211 1212 1213
	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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1217
	struct btrfs_fs_info *fs_info;
1218
	struct inode *inode;
1219
	spinlock_t lock;
1220
	u64 pinned;
1221
	u64 reserved;
1222
	u64 bytes_super;
1223
	u64 flags;
1224
	u64 sectorsize;
1225
	u64 cache_generation;
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1226 1227 1228 1229

	/* for raid56, this is a full stripe, without parity */
	unsigned long full_stripe_len;

1230 1231 1232
	unsigned int ro:1;
	unsigned int dirty:1;
	unsigned int iref:1;
1233 1234

	int disk_cache_state;
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1235

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1236 1237
	/* cache tracking stuff */
	int cached;
1238 1239
	struct btrfs_caching_control *caching_ctl;
	u64 last_byte_to_unpin;
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1240

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1241 1242 1243
	struct btrfs_space_info *space_info;

	/* free space cache stuff */
1244
	struct btrfs_free_space_ctl *free_space_ctl;
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1245 1246 1247 1248 1249 1250

	/* block group cache stuff */
	struct rb_node cache_node;

	/* for block groups in the same raid type */
	struct list_head list;
1251 1252 1253

	/* usage count */
	atomic_t count;
1254 1255 1256 1257 1258

	/* 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;
1259 1260 1261

	/* For delayed block group creation */
	struct list_head new_bg_list;
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1262
};
1263

1264 1265 1266 1267 1268 1269
/* delayed seq elem */
struct seq_list {
	struct list_head list;
	u64 seq;
};

1270 1271 1272 1273 1274
enum btrfs_orphan_cleanup_state {
	ORPHAN_CLEANUP_STARTED	= 1,
	ORPHAN_CLEANUP_DONE	= 2,
};

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1275 1276 1277 1278 1279 1280 1281 1282 1283
/* used by the raid56 code to lock stripes for read/modify/write */
struct btrfs_stripe_hash {
	struct list_head hash_list;
	wait_queue_head_t wait;
	spinlock_t lock;
};

/* used by the raid56 code to lock stripes for read/modify/write */
struct btrfs_stripe_hash_table {
1284 1285 1286 1287
	struct list_head stripe_cache;
	spinlock_t cache_lock;
	int cache_size;
	struct btrfs_stripe_hash table[];
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1288 1289 1290 1291
};

#define BTRFS_STRIPE_HASH_TABLE_BITS 11

1292
/* fs_info */
1293
struct reloc_control;
1294
struct btrfs_device;
1295
struct btrfs_fs_devices;
1296
struct btrfs_balance_control;
1297
struct btrfs_delayed_root;
1298
struct btrfs_fs_info {
1299
	u8 fsid[BTRFS_FSID_SIZE];
1300
	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
1301 1302
	struct btrfs_root *extent_root;
	struct btrfs_root *tree_root;
1303 1304
	struct btrfs_root *chunk_root;
	struct btrfs_root *dev_root;
1305
	struct btrfs_root *fs_root;
1306
	struct btrfs_root *csum_root;
1307
	struct btrfs_root *quota_root;
1308
	struct btrfs_root *uuid_root;
1309 1310 1311

	/* the log root tree is a directory of all the other log roots */
	struct btrfs_root *log_root_tree;
1312 1313

	spinlock_t fs_roots_radix_lock;
1314
	struct radix_tree_root fs_roots_radix;
1315

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	/* block group cache stuff */
	spinlock_t block_group_cache_lock;
1318
	u64 first_logical_byte;
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1319 1320
	struct rb_root block_group_cache_tree;

1321 1322 1323 1324
	/* keep track of unallocated space */
	spinlock_t free_chunk_lock;
	u64 free_chunk_space;

1325 1326
	struct extent_io_tree freed_extents[2];
	struct extent_io_tree *pinned_extents;
1327

1328 1329 1330
	/* logical->physical extent mapping */
	struct btrfs_mapping_tree mapping_tree;

1331 1332 1333 1334
	/*
	 * block reservation for extent, checksum, root tree and
	 * delayed dir index item
	 */
1335 1336 1337 1338 1339 1340 1341
	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;
1342 1343
	/* block reservation for delayed operations */
	struct btrfs_block_rsv delayed_block_rsv;
1344 1345 1346

	struct btrfs_block_rsv empty_block_rsv;

1347
	u64 generation;
1348
	u64 last_trans_committed;
1349 1350 1351 1352 1353 1354

	/*
	 * 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;
1355
	unsigned long mount_opt;
1356
	unsigned long compress_type:4;
1357
	int commit_interval;
1358 1359 1360 1361 1362 1363
	/*
	 * It is a suggestive number, the read side is safe even it gets a
	 * wrong number because we will write out the data into a regular
	 * extent. The write side(mount/remount) is under ->s_umount lock,
	 * so it is also safe.
	 */
1364
	u64 max_inline;
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	/*
	 * Protected by ->chunk_mutex and sb->s_umount.
	 *
	 * The reason that we use two lock to protect it is because only
	 * remount and mount operations can change it and these two operations
	 * are under sb->s_umount, but the read side (chunk allocation) can not
	 * acquire sb->s_umount or the deadlock would happen. So we use two
	 * locks to protect it. On the write side, we must acquire two locks,
	 * and on the read side, we just need acquire one of them.
	 */
1375
	u64 alloc_start;
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1376
	struct btrfs_transaction *running_transaction;
1377
	wait_queue_head_t transaction_throttle;
1378
	wait_queue_head_t transaction_wait;
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1379
	wait_queue_head_t transaction_blocked_wait;
1380
	wait_queue_head_t async_submit_wait;
1381

1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
	/*
	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
	 * when they are updated.
	 *
	 * Because we do not clear the flags for ever, so we needn't use
	 * the lock on the read side.
	 *
	 * We also needn't use the lock when we mount the fs, because
	 * there is no other task which will update the flag.
	 */
	spinlock_t super_lock;
1393 1394
	struct btrfs_super_block *super_copy;
	struct btrfs_super_block *super_for_commit;
1395
	struct block_device *__bdev;
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1396
	struct super_block *sb;
1397
	struct inode *btree_inode;
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1398
	struct backing_dev_info bdi;
1399
	struct mutex tree_log_mutex;
1400 1401
	struct mutex transaction_kthread_mutex;
	struct mutex cleaner_mutex;
1402
	struct mutex chunk_mutex;
1403
	struct mutex volume_mutex;
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1404 1405 1406 1407 1408 1409 1410

	/* this is used during read/modify/write to make sure
	 * no two ios are trying to mod the same stripe at the same
	 * time
	 */
	struct btrfs_stripe_hash_table *stripe_hash_table;

1411 1412 1413 1414 1415 1416 1417 1418
	/*
	 * 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;
1419 1420 1421 1422 1423 1424 1425

	/*
	 * Same as ordered_operations_mutex except this is for ordered extents
	 * and not the operations.
	 */
	struct mutex ordered_extent_flush_mutex;

1426
	struct rw_semaphore extent_commit_sem;
1427

1428
	struct rw_semaphore cleanup_work_sem;
1429

1430
	struct rw_semaphore subvol_sem;
1431 1432
	struct srcu_struct subvol_srcu;

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1433
	spinlock_t trans_lock;
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1434 1435 1436 1437 1438 1439
	/*
	 * 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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1440
	struct list_head trans_list;
1441
	struct list_head dead_roots;
1442
	struct list_head caching_block_groups;
1443

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Yan, Zheng 已提交
1444 1445 1446
	spinlock_t delayed_iput_lock;
	struct list_head delayed_iputs;

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1447 1448
	/* this protects tree_mod_seq_list */
	spinlock_t tree_mod_seq_lock;
1449
	atomic64_t tree_mod_seq;
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1450
	struct list_head tree_mod_seq_list;
1451
	struct seq_list tree_mod_seq_elem;
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1452 1453 1454 1455 1456

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

1457
	atomic_t nr_async_submits;
1458
	atomic_t async_submit_draining;
1459
	atomic_t nr_async_bios;
1460
	atomic_t async_delalloc_pages;
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1461
	atomic_t open_ioctl_trans;
1462

1463
	/*
1464
	 * this is used to protect the following list -- ordered_roots.
1465
	 */
1466
	spinlock_t ordered_root_lock;
1467 1468

	/*
1469 1470 1471
	 * all fs/file tree roots in which there are data=ordered extents
	 * pending writeback are added into this list.
	 *
1472 1473 1474
	 * these can span multiple transactions and basically include
	 * every dirty data page that isn't from nodatacow
	 */
1475
	struct list_head ordered_roots;
1476

1477 1478 1479
	spinlock_t delalloc_root_lock;
	/* all fs/file tree roots that have delalloc inodes. */
	struct list_head delalloc_roots;
1480

1481 1482 1483 1484 1485 1486
	/*
	 * 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.
1487 1488 1489
	 *
	 * A third pool does submit_bio to avoid deadlocking with the other
	 * two
1490
	 */
1491
	struct btrfs_workers generic_worker;
1492
	struct btrfs_workers workers;
1493
	struct btrfs_workers delalloc_workers;
1494
	struct btrfs_workers flush_workers;
1495
	struct btrfs_workers endio_workers;
1496
	struct btrfs_workers endio_meta_workers;
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1497 1498
	struct btrfs_workers endio_raid56_workers;
	struct btrfs_workers rmw_workers;
1499
	struct btrfs_workers endio_meta_write_workers;
1500
	struct btrfs_workers endio_write_workers;
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1501
	struct btrfs_workers endio_freespace_worker;
1502
	struct btrfs_workers submit_workers;
1503
	struct btrfs_workers caching_workers;
1504
	struct btrfs_workers readahead_workers;
1505

1506 1507 1508 1509 1510 1511
	/*
	 * 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;
1512
	struct btrfs_workers delayed_workers;
1513 1514
	struct task_struct *transaction_kthread;
	struct task_struct *cleaner_kthread;
1515
	int thread_pool_size;
1516

1517 1518
	struct kobject super_kobj;
	struct completion kobj_unregister;
1519
	int do_barriers;
1520
	int closing;
1521
	int log_root_recovering;
1522

1523
	u64 total_pinned;
1524

1525 1526
	/* used to keep from writing metadata until there is a nice batch */
	struct percpu_counter dirty_metadata_bytes;
1527
	struct percpu_counter delalloc_bytes;
1528
	s32 dirty_metadata_batch;
1529 1530
	s32 delalloc_batch;

1531 1532
	struct list_head dirty_cowonly_roots;

1533
	struct btrfs_fs_devices *fs_devices;
1534 1535 1536 1537 1538 1539

	/*
	 * 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.
	 */
1540
	struct list_head space_info;
1541

1542 1543
	struct btrfs_space_info *data_sinfo;

1544 1545
	struct reloc_control *reloc_ctl;

1546 1547 1548 1549 1550
	/* 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;
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1551

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1552 1553 1554 1555 1556
	/* auto defrag inodes go here */
	spinlock_t defrag_inodes_lock;
	struct rb_root defrag_inodes;
	atomic_t defrag_running;

1557 1558
	/* Used to protect avail_{data, metadata, system}_alloc_bits */
	seqlock_t profiles_lock;
1559 1560 1561 1562 1563
	/*
	 * 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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1564 1565 1566
	u64 avail_data_alloc_bits;
	u64 avail_metadata_alloc_bits;
	u64 avail_system_alloc_bits;
1567

1568 1569 1570
	/* restriper state */
	spinlock_t balance_lock;
	struct mutex balance_mutex;
1571 1572
	atomic_t balance_running;
	atomic_t balance_pause_req;
1573
	atomic_t balance_cancel_req;
1574
	struct btrfs_balance_control *balance_ctl;
1575
	wait_queue_head_t balance_wait_q;
1576

1577 1578 1579
	unsigned data_chunk_allocations;
	unsigned metadata_ratio;

1580
	void *bdev_holder;
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1581

A
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1582 1583 1584 1585 1586 1587 1588 1589 1590
	/* 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;
	int scrub_workers_refcnt;
	struct btrfs_workers scrub_workers;
1591 1592
	struct btrfs_workers scrub_wr_completion_workers;
	struct btrfs_workers scrub_nocow_workers;
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Arne Jansen 已提交
1593

1594 1595 1596
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	u32 check_integrity_print_mask;
#endif
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
	/*
	 * quota information
	 */
	unsigned int quota_enabled:1;

	/*
	 * quota_enabled only changes state after a commit. This holds the
	 * next state.
	 */
	unsigned int pending_quota_state:1;

	/* is qgroup tracking in a consistent state? */
	u64 qgroup_flags;

	/* holds configuration and tracking. Protected by qgroup_lock */
	struct rb_root qgroup_tree;
	spinlock_t qgroup_lock;

1615 1616 1617 1618 1619 1620
	/*
	 * used to avoid frequently calling ulist_alloc()/ulist_free()
	 * when doing qgroup accounting, it must be protected by qgroup_lock.
	 */
	struct ulist *qgroup_ulist;

1621 1622 1623
	/* protect user change for quota operations */
	struct mutex qgroup_ioctl_lock;

1624 1625 1626 1627 1628
	/* list of dirty qgroups to be written at next commit */
	struct list_head dirty_qgroups;

	/* used by btrfs_qgroup_record_ref for an efficient tree traversal */
	u64 qgroup_seq;
1629

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1630 1631 1632 1633
	/* qgroup rescan items */
	struct mutex qgroup_rescan_lock; /* protects the progress item */
	struct btrfs_key qgroup_rescan_progress;
	struct btrfs_workers qgroup_rescan_workers;
1634
	struct completion qgroup_rescan_completion;
1635
	struct btrfs_work qgroup_rescan_work;
J
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1636

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1637
	/* filesystem state */
1638
	unsigned long fs_state;
1639 1640

	struct btrfs_delayed_root *delayed_root;
C
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1641

1642 1643 1644
	/* readahead tree */
	spinlock_t reada_lock;
	struct radix_tree_root reada_tree;
1645

C
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1646 1647
	/* next backup root to be overwritten */
	int backup_root_index;
1648 1649

	int num_tolerated_disk_barrier_failures;
1650 1651 1652

	/* device replace state */
	struct btrfs_dev_replace dev_replace;
1653 1654

	atomic_t mutually_exclusive_operation_running;
S
Stefan Behrens 已提交
1655 1656

	struct semaphore uuid_tree_rescan_sem;
1657
	unsigned int update_uuid_tree_gen:1;
1658
};
1659

1660 1661
/*
 * in ram representation of the tree.  extent_root is used for all allocations
1662
 * and for the extent tree extent_root root.
1663 1664
 */
struct btrfs_root {
1665
	struct extent_buffer *node;
1666

1667
	struct extent_buffer *commit_root;
1668
	struct btrfs_root *log_root;
Z
Zheng Yan 已提交
1669
	struct btrfs_root *reloc_root;
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Yan Zheng 已提交
1670

1671 1672
	struct btrfs_root_item root_item;
	struct btrfs_key root_key;
1673
	struct btrfs_fs_info *fs_info;
1674 1675
	struct extent_io_tree dirty_log_pages;

1676 1677
	struct kobject root_kobj;
	struct completion kobj_unregister;
1678
	struct mutex objectid_mutex;
Y
Yan Zheng 已提交
1679

1680 1681 1682
	spinlock_t accounting_lock;
	struct btrfs_block_rsv *block_rsv;

1683 1684 1685 1686 1687 1688 1689 1690
	/* 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;
1691
	struct inode *cache_inode;
1692

1693
	struct mutex log_mutex;
Y
Yan Zheng 已提交
1694 1695 1696 1697
	wait_queue_head_t log_writer_wait;
	wait_queue_head_t log_commit_wait[2];
	atomic_t log_writers;
	atomic_t log_commit[2];
M
Miao Xie 已提交
1698
	atomic_t log_batch;
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Yan Zheng 已提交
1699
	unsigned long log_transid;
1700
	unsigned long last_log_commit;
1701 1702
	pid_t log_start_pid;
	bool log_multiple_pids;
1703

1704 1705
	u64 objectid;
	u64 last_trans;
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715

	/* 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;

1716 1717
	u32 stripesize;

1718
	u32 type;
1719 1720

	u64 highest_objectid;
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Chris Mason 已提交
1721 1722 1723 1724 1725 1726 1727 1728

	/* 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;
1729
	int ref_cows;
1730
	int track_dirty;
1731
	int in_radix;
1732 1733 1734
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	int dummy_root;
#endif
1735
	u64 defrag_trans_start;
1736
	struct btrfs_key defrag_progress;
C
Chris Mason 已提交
1737
	struct btrfs_key defrag_max;
1738
	int defrag_running;
1739
	char *name;
1740 1741 1742

	/* the dirty list is only used by non-reference counted roots */
	struct list_head dirty_list;
1743

1744 1745
	struct list_head root_list;

1746 1747 1748
	spinlock_t log_extents_lock[2];
	struct list_head logged_list[2];

1749
	spinlock_t orphan_lock;
1750
	atomic_t orphan_inodes;
1751 1752 1753
	struct btrfs_block_rsv *orphan_block_rsv;
	int orphan_item_inserted;
	int orphan_cleanup_state;
1754

1755 1756 1757 1758
	spinlock_t inode_lock;
	/* red-black tree that keeps track of in-memory inodes */
	struct rb_root inode_tree;

1759 1760 1761 1762 1763
	/*
	 * radix tree that keeps track of delayed nodes of every inode,
	 * protected by inode_lock
	 */
	struct radix_tree_root delayed_nodes_tree;
1764 1765 1766 1767
	/*
	 * right now this just gets used so that a root has its own devid
	 * for stat.  It may be used for more later
	 */
1768
	dev_t anon_dev;
1769 1770

	int force_cow;
1771

1772
	spinlock_t root_item_lock;
1773
	atomic_t refs;
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783

	spinlock_t delalloc_lock;
	/*
	 * 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.
	 */
	struct list_head delalloc_inodes;
	struct list_head delalloc_root;
	u64 nr_delalloc_inodes;
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
	/*
	 * this is used by the balancing code to wait for all the pending
	 * ordered extents
	 */
	spinlock_t ordered_extent_lock;

	/*
	 * 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
	 */
	struct list_head ordered_extents;
	struct list_head ordered_root;
	u64 nr_ordered_extents;
1798 1799
};

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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];
};


C
Chris Mason 已提交
1832 1833 1834 1835 1836
/*
 * 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
 */
C
Chris Mason 已提交
1837
#define BTRFS_INODE_ITEM_KEY		1
1838
#define BTRFS_INODE_REF_KEY		12
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Mark Fasheh 已提交
1839
#define BTRFS_INODE_EXTREF_KEY		13
1840 1841
#define BTRFS_XATTR_ITEM_KEY		24
#define BTRFS_ORPHAN_ITEM_KEY		48
C
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1842
/* reserve 2-15 close to the inode for later flexibility */
C
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1843 1844 1845 1846 1847

/*
 * dir items are the name -> inode pointers in a directory.  There is one
 * for every name in a directory.
 */
1848 1849 1850 1851
#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
C
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1852
/*
C
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1853
 * extent data is for file data
C
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1854
 */
1855
#define BTRFS_EXTENT_DATA_KEY	108
1856

C
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1857
/*
1858 1859
 * extent csums are stored in a separate tree and hold csums for
 * an entire extent on disk.
C
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1860
 */
1861
#define BTRFS_EXTENT_CSUM_KEY	128
C
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1862

C
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1863
/*
W
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1864
 * root items point to tree roots.  They are typically in the root
C
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1865 1866
 * tree used by the super block to find all the other trees
 */
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
#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

C
Chris Mason 已提交
1882 1883 1884 1885
/*
 * extent items are in the extent map tree.  These record which blocks
 * are used, and how many references there are to each block
 */
1886
#define BTRFS_EXTENT_ITEM_KEY	168
1887

1888 1889 1890 1891 1892 1893
/*
 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
 * the length, so we save the level in key->offset instead of the length.
 */
#define BTRFS_METADATA_ITEM_KEY	169

1894 1895 1896 1897 1898 1899 1900 1901 1902
#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
C
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/*
 * block groups give us hints into the extent allocation trees.  Which
 * blocks are free etc etc
 */
1908
#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1909

1910 1911 1912
#define BTRFS_DEV_EXTENT_KEY	204
#define BTRFS_DEV_ITEM_KEY	216
#define BTRFS_CHUNK_ITEM_KEY	228
1913

A
Arne Jansen 已提交
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
/*
 * Records the overall state of the qgroups.
 * There's only one instance of this key present,
 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
 */
#define BTRFS_QGROUP_STATUS_KEY         240
/*
 * Records the currently used space of the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
 */
#define BTRFS_QGROUP_INFO_KEY           242
/*
 * Contains the user configured limits for the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
 */
#define BTRFS_QGROUP_LIMIT_KEY          244
/*
 * Records the child-parent relationship of qgroups. For
 * each relation, 2 keys are present:
 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
 */
#define BTRFS_QGROUP_RELATION_KEY       246

1938 1939
#define BTRFS_BALANCE_ITEM_KEY	248

1940 1941 1942 1943 1944 1945
/*
 * Persistantly stores the io stats in the device tree.
 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
 */
#define BTRFS_DEV_STATS_KEY	249

1946 1947 1948 1949 1950 1951
/*
 * Persistantly stores the device replace state in the device tree.
 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
 */
#define BTRFS_DEV_REPLACE_KEY	250

1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
/*
 * Stores items that allow to quickly map UUIDs to something else.
 * These items are part of the filesystem UUID tree.
 * The key is built like this:
 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
 */
#if BTRFS_UUID_SIZE != 16
#error "UUID items require BTRFS_UUID_SIZE == 16!"
#endif
#define BTRFS_UUID_KEY_SUBVOL	251	/* for UUIDs assigned to subvols */
#define BTRFS_UUID_KEY_RECEIVED_SUBVOL	252	/* for UUIDs assigned to
						 * received subvols */

C
Chris Mason 已提交
1965 1966 1967 1968
/*
 * string items are for debugging.  They just store a short string of
 * data in the FS
 */
C
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1969 1970
#define BTRFS_STRING_ITEM_KEY	253

1971 1972 1973 1974 1975
/*
 * Flags for mount options.
 *
 * Note: don't forget to add new options to btrfs_show_options()
 */
1976 1977 1978
#define BTRFS_MOUNT_NODATASUM		(1 << 0)
#define BTRFS_MOUNT_NODATACOW		(1 << 1)
#define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1979
#define BTRFS_MOUNT_SSD			(1 << 3)
1980
#define BTRFS_MOUNT_DEGRADED		(1 << 4)
C
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1981
#define BTRFS_MOUNT_COMPRESS		(1 << 5)
S
Sage Weil 已提交
1982
#define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1983
#define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1984
#define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
C
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1985
#define BTRFS_MOUNT_NOSSD		(1 << 9)
C
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1986
#define BTRFS_MOUNT_DISCARD		(1 << 10)
C
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1987
#define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1988
#define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
1989
#define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
1990
#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1991
#define BTRFS_MOUNT_ENOSPC_DEBUG	 (1 << 15)
C
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1992
#define BTRFS_MOUNT_AUTO_DEFRAG		(1 << 16)
C
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1993
#define BTRFS_MOUNT_INODE_MAP_CACHE	(1 << 17)
C
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1994
#define BTRFS_MOUNT_RECOVERY		(1 << 18)
1995
#define BTRFS_MOUNT_SKIP_BALANCE	(1 << 19)
1996 1997
#define BTRFS_MOUNT_CHECK_INTEGRITY	(1 << 20)
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
J
Jeff Mahoney 已提交
1998
#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)
1999
#define BTRFS_MOUNT_RESCAN_UUID_TREE	(1 << 23)
2000

2001 2002
#define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)

2003 2004
#define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
M
Miao Xie 已提交
2005
#define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
2006 2007
#define btrfs_test_opt(root, opt)	((root)->fs_info->mount_opt & \
					 BTRFS_MOUNT_##opt)
Y
Yan 已提交
2008 2009 2010
/*
 * Inode flags
 */
Y
Yan 已提交
2011 2012 2013
#define BTRFS_INODE_NODATASUM		(1 << 0)
#define BTRFS_INODE_NODATACOW		(1 << 1)
#define BTRFS_INODE_READONLY		(1 << 2)
C
Chris Mason 已提交
2014
#define BTRFS_INODE_NOCOMPRESS		(1 << 3)
Y
Yan Zheng 已提交
2015
#define BTRFS_INODE_PREALLOC		(1 << 4)
2016 2017 2018 2019 2020 2021
#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)
2022
#define BTRFS_INODE_COMPRESS		(1 << 11)
2023

2024 2025
#define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)

2026 2027 2028 2029 2030 2031 2032 2033
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)
{
J
Josef Bacik 已提交
2034
	token->kaddr = NULL;
2035 2036
}

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
/* 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)))

L
Li Zefan 已提交
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#define DECLARE_BTRFS_SETGET_BITS(bits)					\
u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
			       unsigned long off,			\
                              struct btrfs_map_token *token);		\
void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,	\
			    unsigned long off, u##bits val,		\
			    struct btrfs_map_token *token);		\
static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
				       unsigned long off)		\
{									\
	return btrfs_get_token_##bits(eb, ptr, off, NULL);		\
}									\
static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
				    unsigned long off, u##bits val)	\
{									\
       btrfs_set_token_##bits(eb, ptr, off, val, NULL);			\
}

DECLARE_BTRFS_SETGET_BITS(8)
DECLARE_BTRFS_SETGET_BITS(16)
DECLARE_BTRFS_SETGET_BITS(32)
DECLARE_BTRFS_SETGET_BITS(64)

2080
#define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
L
Li Zefan 已提交
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static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)	\
{									\
	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
}									\
static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\
				    u##bits val)			\
{									\
	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
}									\
static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
					 struct btrfs_map_token *token)	\
{									\
	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
	return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
}									\
static inline void btrfs_set_token_##name(struct extent_buffer *eb,	\
					  type *s, u##bits val,		\
                                         struct btrfs_map_token *token)	\
{									\
	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
	btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
}
2105 2106 2107 2108

#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
{									\
2109
	type *p = page_address(eb->pages[0]);				\
D
David Miller 已提交
2110
	u##bits res = le##bits##_to_cpu(p->member);			\
2111
	return res;							\
2112 2113 2114 2115
}									\
static inline void btrfs_set_##name(struct extent_buffer *eb,		\
				    u##bits val)			\
{									\
2116
	type *p = page_address(eb->pages[0]);				\
D
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2117
	p->member = cpu_to_le##bits(val);				\
2118
}
C
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2119

2120 2121 2122 2123 2124 2125 2126 2127
#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);				\
C
Chris Mason 已提交
2128 2129
}

2130 2131 2132 2133 2134
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);
2135 2136
BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
		   start_offset, 64);
2137 2138
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
2139 2140 2141
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);
Y
Yan Zheng 已提交
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BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
2143

2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
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);
2156 2157 2158 2159 2160 2161
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);
Y
Yan Zheng 已提交
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BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
			 generation, 64);
2164

2165
static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
2166
{
2167
	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
2168 2169
}

2170
static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
Y
Yan Zheng 已提交
2171
{
2172
	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
Y
Yan Zheng 已提交
2173 2174
}

2175
BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
2176 2177 2178 2179 2180 2181 2182
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);
2184 2185 2186
BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);

2187 2188 2189 2190 2191 2192
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);
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204
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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BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
			 sub_stripes, 16);
2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
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;
}

2219 2220 2221 2222 2223
static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
{
	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
}

2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
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));
}

2236 2237 2238 2239 2240
/* 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);
2241 2242
BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
			struct btrfs_block_group_item, chunk_objectid, 64);
2243 2244

BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
2245 2246 2247 2248 2249
		   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
2250

2251 2252
/* struct btrfs_inode_ref */
BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
2253
BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
2254

M
Mark Fasheh 已提交
2255 2256 2257 2258 2259 2260 2261
/* struct btrfs_inode_extref */
BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
		   parent_objectid, 64);
BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
		   name_len, 16);
BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);

2262 2263
/* struct btrfs_inode_item */
BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
2264
BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
2265
BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
2266
BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
2267
BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
2268 2269 2270 2271 2272
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);
2273
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
2274
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
			 generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
			 sequence, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
			 transid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
			 nbytes, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
			 block_group, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
C
Chris Mason 已提交
2292

2293
static inline struct btrfs_timespec *
2294
btrfs_inode_atime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
2295
{
2296 2297
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, atime);
2298
	return (struct btrfs_timespec *)ptr;
C
Chris Mason 已提交
2299 2300
}

2301
static inline struct btrfs_timespec *
2302
btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
2303
{
2304 2305
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, mtime);
2306
	return (struct btrfs_timespec *)ptr;
C
Chris Mason 已提交
2307 2308
}

2309
static inline struct btrfs_timespec *
2310
btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
C
Chris Mason 已提交
2311
{
2312 2313
	unsigned long ptr = (unsigned long)inode_item;
	ptr += offsetof(struct btrfs_inode_item, ctime);
2314
	return (struct btrfs_timespec *)ptr;
C
Chris Mason 已提交
2315 2316
}

2317 2318
BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
2319 2320
BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
C
Chris Mason 已提交
2321

2322
/* struct btrfs_dev_extent */
2323 2324 2325 2326 2327 2328
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);
2329 2330
BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);

2331
static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
2332 2333
{
	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
2334
	return (unsigned long)dev + ptr;
2335 2336
}

2337 2338 2339 2340
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);
2341

2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
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
2360

2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
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
2398

2399 2400
/* struct btrfs_node */
BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
2401
BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
2402 2403 2404 2405
BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
			 blockptr, 64);
BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
			 generation, 64);
C
Chris Mason 已提交
2406

2407
static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
2408
{
2409 2410 2411 2412
	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
2413 2414
}

2415 2416
static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
					   int nr, u64 val)
C
Chris Mason 已提交
2417
{
2418 2419 2420 2421
	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
2422 2423
}

2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440
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);
}

2441
static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2442
{
2443 2444
	return offsetof(struct btrfs_node, ptrs) +
		sizeof(struct btrfs_key_ptr) * nr;
2445 2446
}

2447 2448 2449
void btrfs_node_key(struct extent_buffer *eb,
		    struct btrfs_disk_key *disk_key, int nr);

2450 2451
static inline void btrfs_set_node_key(struct extent_buffer *eb,
				      struct btrfs_disk_key *disk_key, int nr)
2452
{
2453 2454 2455 2456
	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);
2457 2458
}

2459 2460 2461
/* struct btrfs_item */
BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
2462 2463
BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2464

2465
static inline unsigned long btrfs_item_nr_offset(int nr)
2466
{
2467 2468
	return offsetof(struct btrfs_leaf, items) +
		sizeof(struct btrfs_item) * nr;
2469 2470
}

2471
static inline struct btrfs_item *btrfs_item_nr(int nr)
C
Chris Mason 已提交
2472
{
2473
	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
C
Chris Mason 已提交
2474 2475
}

2476 2477
static inline u32 btrfs_item_end(struct extent_buffer *eb,
				 struct btrfs_item *item)
C
Chris Mason 已提交
2478
{
2479
	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
C
Chris Mason 已提交
2480 2481
}

2482
static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
2483
{
2484
	return btrfs_item_end(eb, btrfs_item_nr(nr));
C
Chris Mason 已提交
2485 2486
}

2487
static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
2488
{
2489
	return btrfs_item_offset(eb, btrfs_item_nr(nr));
C
Chris Mason 已提交
2490 2491
}

2492
static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
C
Chris Mason 已提交
2493
{
2494
	return btrfs_item_size(eb, btrfs_item_nr(nr));
C
Chris Mason 已提交
2495 2496
}

2497 2498
static inline void btrfs_item_key(struct extent_buffer *eb,
			   struct btrfs_disk_key *disk_key, int nr)
2499
{
2500
	struct btrfs_item *item = btrfs_item_nr(nr);
2501
	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2502 2503
}

2504 2505
static inline void btrfs_set_item_key(struct extent_buffer *eb,
			       struct btrfs_disk_key *disk_key, int nr)
2506
{
2507
	struct btrfs_item *item = btrfs_item_nr(nr);
2508
	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2509 2510
}

2511 2512
BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);

2513 2514 2515 2516 2517 2518 2519
/*
 * 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);

2520
/* struct btrfs_dir_item */
J
Josef Bacik 已提交
2521
BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2522 2523
BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2524
BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2525 2526 2527 2528 2529 2530 2531
BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
			 data_len, 16);
BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
			 name_len, 16);
BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
			 transid, 64);
2532

2533 2534 2535
static inline void btrfs_dir_item_key(struct extent_buffer *eb,
				      struct btrfs_dir_item *item,
				      struct btrfs_disk_key *key)
2536
{
2537
	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2538 2539
}

2540 2541 2542
static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
					  struct btrfs_dir_item *item,
					  struct btrfs_disk_key *key)
2543
{
2544
	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2545 2546
}

2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
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);
}

2568 2569 2570 2571 2572
/* 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);
2573

C
Chris Mason 已提交
2574 2575 2576 2577
static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
					 struct btrfs_disk_key *disk)
{
	cpu->offset = le64_to_cpu(disk->offset);
2578
	cpu->type = disk->type;
C
Chris Mason 已提交
2579 2580 2581 2582 2583 2584 2585
	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);
2586
	disk->type = cpu->type;
C
Chris Mason 已提交
2587 2588 2589
	disk->objectid = cpu_to_le64(cpu->objectid);
}

2590 2591
static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
				  struct btrfs_key *key, int nr)
2592
{
2593 2594 2595
	struct btrfs_disk_key disk_key;
	btrfs_node_key(eb, &disk_key, nr);
	btrfs_disk_key_to_cpu(key, &disk_key);
2596 2597
}

2598 2599
static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
				  struct btrfs_key *key, int nr)
2600
{
2601 2602 2603
	struct btrfs_disk_key disk_key;
	btrfs_item_key(eb, &disk_key, nr);
	btrfs_disk_key_to_cpu(key, &disk_key);
2604 2605
}

2606 2607 2608
static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
				      struct btrfs_dir_item *item,
				      struct btrfs_key *key)
2609
{
2610 2611 2612
	struct btrfs_disk_key disk_key;
	btrfs_dir_item_key(eb, item, &disk_key);
	btrfs_disk_key_to_cpu(key, &disk_key);
2613 2614
}

2615

2616
static inline u8 btrfs_key_type(struct btrfs_key *key)
2617
{
2618
	return key->type;
2619 2620
}

2621
static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2622
{
2623
	key->type = val;
2624 2625
}

2626
/* struct btrfs_header */
2627
BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2628 2629 2630 2631
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);
2632
BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2633
BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2634 2635 2636 2637 2638 2639
BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
			 generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
			 nritems, 32);
BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2640

2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659
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;
}

2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674
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);
}

2675
static inline unsigned long btrfs_header_fsid(void)
2676
{
2677
	return offsetof(struct btrfs_header, fsid);
2678 2679
}

2680
static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2681
{
2682
	return offsetof(struct btrfs_header, chunk_tree_uuid);
2683 2684
}

2685
static inline int btrfs_is_leaf(struct extent_buffer *eb)
2686
{
C
Chris Mason 已提交
2687
	return btrfs_header_level(eb) == 0;
2688 2689
}

2690
/* struct btrfs_root_item */
2691 2692
BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
		   generation, 64);
2693
BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2694 2695
BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2696

2697 2698
BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
			 generation, 64);
2699 2700
BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2701 2702
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);
2703
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2704 2705
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);
Y
Yan Zheng 已提交
2706 2707
BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
			 last_snapshot, 64);
2708 2709 2710 2711 2712 2713 2714 2715 2716 2717
BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
			 generation_v2, 64);
BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
			 ctransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
			 otransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
			 stransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
			 rtransid, 64);
C
Chris Mason 已提交
2718

L
Li Zefan 已提交
2719 2720
static inline bool btrfs_root_readonly(struct btrfs_root *root)
{
2721
	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
L
Li Zefan 已提交
2722 2723
}

C
Chris Mason 已提交
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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);

2773 2774
/* struct btrfs_balance_item */
BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2775

2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852
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 */
2853
BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2854
BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2855 2856 2857
BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
			 generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2858 2859
BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
			 struct btrfs_super_block, sys_chunk_array_size, 32);
2860 2861
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
			 struct btrfs_super_block, chunk_root_generation, 64);
2862 2863
BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
			 root_level, 8);
2864 2865 2866
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,
2867 2868 2869
			 chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
			 log_root, 64);
2870 2871
BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
			 log_root_transid, 64);
2872 2873
BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
			 log_root_level, 8);
2874 2875 2876 2877
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);
2878 2879 2880 2881 2882 2883
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);
2884 2885
BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
			 stripesize, 32);
2886 2887
BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
			 root_dir_objectid, 64);
2888 2889
BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
			 num_devices, 64);
2890 2891 2892
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,
2893
			 compat_ro_flags, 64);
2894 2895
BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
			 incompat_flags, 64);
2896 2897
BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
			 csum_type, 16);
2898 2899
BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
			 cache_generation, 64);
2900
BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2901 2902
BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
			 uuid_tree_generation, 64);
2903 2904 2905

static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
{
D
David Sterba 已提交
2906 2907 2908 2909
	u16 t = btrfs_super_csum_type(s);
	/*
	 * csum type is validated at mount time
	 */
2910 2911
	return btrfs_csum_sizes[t];
}
2912

2913
static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2914
{
2915
	return offsetof(struct btrfs_leaf, items);
2916 2917
}

2918 2919
/* struct btrfs_file_extent_item */
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2920 2921 2922 2923 2924 2925 2926 2927
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
			 struct btrfs_file_extent_item, disk_bytenr, 64);
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
			 struct btrfs_file_extent_item, offset, 64);
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
			 struct btrfs_file_extent_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
			 struct btrfs_file_extent_item, num_bytes, 64);
2928

C
Chris Mason 已提交
2929 2930
static inline unsigned long
btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2931
{
2932
	unsigned long offset = (unsigned long)e;
2933
	offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2934
	return offset;
2935 2936 2937 2938
}

static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
{
2939
	return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2940 2941
}

2942 2943
BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
		   disk_bytenr, 64);
2944 2945
BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
		   generation, 64);
2946 2947
BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
		   disk_num_bytes, 64);
2948 2949
BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
		  offset, 64);
2950 2951
BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
		   num_bytes, 64);
C
Chris Mason 已提交
2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
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;
}
2982

2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
/* btrfs_dev_stats_item */
static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
					struct btrfs_dev_stats_item *ptr,
					int index)
{
	u64 val;

	read_extent_buffer(eb, &val,
			   offsetof(struct btrfs_dev_stats_item, values) +
			    ((unsigned long)ptr) + (index * sizeof(u64)),
			   sizeof(val));
	return val;
}

static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
					     struct btrfs_dev_stats_item *ptr,
					     int index, u64 val)
{
	write_extent_buffer(eb, &val,
			    offsetof(struct btrfs_dev_stats_item, values) +
			     ((unsigned long)ptr) + (index * sizeof(u64)),
			    sizeof(val));
}

A
Arne Jansen 已提交
3007 3008 3009 3010 3011 3012 3013
/* btrfs_qgroup_status_item */
BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
		   generation, 64);
BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
		   version, 64);
BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
		   flags, 64);
J
Jan Schmidt 已提交
3014 3015
BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
		   rescan, 64);
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Arne Jansen 已提交
3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049

/* btrfs_qgroup_info_item */
BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
		   generation, 64);
BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
		   rfer_cmpr, 64);
BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
		   excl_cmpr, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
			 struct btrfs_qgroup_info_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
			 rfer, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
			 excl, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
			 struct btrfs_qgroup_info_item, excl_cmpr, 64);

/* btrfs_qgroup_limit_item */
BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
		   flags, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
		   max_rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
		   max_excl, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
		   rsv_rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
		   rsv_excl, 64);

3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
/* btrfs_dev_replace_item */
BTRFS_SETGET_FUNCS(dev_replace_src_devid,
		   struct btrfs_dev_replace_item, src_devid, 64);
BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
		   64);
BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
		   replace_state, 64);
BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
		   time_started, 64);
BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
		   time_stopped, 64);
BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
		   num_write_errors, 64);
BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
		   64);
BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
		   cursor_left, 64);
BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
		   cursor_right, 64);

BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
			 struct btrfs_dev_replace_item, src_devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
			 struct btrfs_dev_replace_item,
			 cont_reading_from_srcdev_mode, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
			 struct btrfs_dev_replace_item, replace_state, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
			 struct btrfs_dev_replace_item, time_started, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
			 struct btrfs_dev_replace_item, time_stopped, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
			 struct btrfs_dev_replace_item, num_write_errors, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
			 struct btrfs_dev_replace_item,
			 num_uncorrectable_read_errors, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
			 struct btrfs_dev_replace_item, cursor_left, 64);
BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
			 struct btrfs_dev_replace_item, cursor_right, 64);

3093
static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
C
Chris Mason 已提交
3094 3095 3096 3097
{
	return sb->s_fs_info;
}

C
Chris Mason 已提交
3098 3099
static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
{
3100 3101 3102 3103 3104
	if (level == 0)
		return root->leafsize;
	return root->nodesize;
}

3105 3106
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
C
Chris Mason 已提交
3107
	((type *)(btrfs_leaf_data(leaf) + \
3108 3109 3110 3111 3112
	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)))
3113

3114 3115 3116 3117 3118 3119
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));
}

3120 3121 3122 3123 3124
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
3125
/* extent-tree.c */
3126
static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
3127
						 unsigned num_items)
3128 3129
{
	return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3130
		2 * num_items;
3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141
}

/*
 * 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;
3142 3143
}

3144 3145
int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
				       struct btrfs_root *root);
3146
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3147 3148
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, unsigned long count);
Z
Zheng Yan 已提交
3149
int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
3150 3151
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, u64 bytenr,
3152
			     u64 offset, int metadata, u64 *refs, u64 *flags);
3153 3154
int btrfs_pin_extent(struct btrfs_root *root,
		     u64 bytenr, u64 num, int reserved);
3155
int btrfs_pin_extent_for_log_replay(struct btrfs_root *root,
3156
				    u64 bytenr, u64 num_bytes);
3157 3158
int btrfs_exclude_logged_extents(struct btrfs_root *root,
				 struct extent_buffer *eb);
Y
Yan Zheng 已提交
3159
int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
3160 3161
			  struct btrfs_root *root,
			  u64 objectid, u64 offset, u64 bytenr);
C
Chris Mason 已提交
3162 3163 3164
struct btrfs_block_group_cache *btrfs_lookup_block_group(
						 struct btrfs_fs_info *info,
						 u64 bytenr);
3165
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
3166
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
3167 3168 3169
					struct btrfs_root *root, u32 blocksize,
					u64 parent, u64 root_objectid,
					struct btrfs_disk_key *key, int level,
3170
					u64 hint, u64 empty_size);
3171 3172 3173
void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   struct extent_buffer *buf,
3174
			   u64 parent, int last_ref);
3175 3176 3177 3178 3179 3180 3181 3182
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);
3183 3184 3185
int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes,
			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
			 struct btrfs_key *ins, int is_data);
3186
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
A
Arne Jansen 已提交
3187
		  struct extent_buffer *buf, int full_backref, int for_cow);
3188
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
A
Arne Jansen 已提交
3189
		  struct extent_buffer *buf, int full_backref, int for_cow);
3190 3191 3192
int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
				struct btrfs_root *root,
				u64 bytenr, u64 num_bytes, u64 flags,
3193
				int level, int is_data);
Z
Zheng Yan 已提交
3194 3195
int btrfs_free_extent(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root,
A
Arne Jansen 已提交
3196 3197
		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
		      u64 owner, u64 offset, int for_cow);
3198

3199
int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
3200 3201
int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
				       u64 start, u64 len);
3202 3203
void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root);
C
Chris Mason 已提交
3204
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
3205
			       struct btrfs_root *root);
C
Chris Mason 已提交
3206
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
Z
Zheng Yan 已提交
3207 3208
			 struct btrfs_root *root,
			 u64 bytenr, u64 num_bytes, u64 parent,
A
Arne Jansen 已提交
3209
			 u64 root_objectid, u64 owner, u64 offset, int for_cow);
3210

C
Chris Mason 已提交
3211 3212
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
				    struct btrfs_root *root);
3213
int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
C
Chris Mason 已提交
3214 3215
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
3216
int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
3217 3218
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root, u64 bytes_used,
3219
			   u64 type, u64 chunk_objectid, u64 chunk_offset,
3220
			   u64 size);
Z
Zheng Yan 已提交
3221 3222
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root, u64 group_start);
3223 3224
void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
				       struct btrfs_root *root);
3225
u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
3226
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
M
Miao Xie 已提交
3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238

enum btrfs_reserve_flush_enum {
	/* If we are in the transaction, we can't flush anything.*/
	BTRFS_RESERVE_NO_FLUSH,
	/*
	 * Flushing delalloc may cause deadlock somewhere, in this
	 * case, use FLUSH LIMIT
	 */
	BTRFS_RESERVE_FLUSH_LIMIT,
	BTRFS_RESERVE_FLUSH_ALL,
};

3239 3240
int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
3241 3242
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
				struct btrfs_root *root);
3243 3244 3245
int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
				  struct inode *inode);
void btrfs_orphan_release_metadata(struct inode *inode);
3246 3247 3248
int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
				     struct btrfs_block_rsv *rsv,
				     int nitems,
3249
				     u64 *qgroup_reserved, bool use_global_rsv);
3250 3251 3252
void btrfs_subvolume_release_metadata(struct btrfs_root *root,
				      struct btrfs_block_rsv *rsv,
				      u64 qgroup_reserved);
3253 3254 3255 3256
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);
3257 3258 3259
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
					      unsigned short type);
3260 3261
void btrfs_free_block_rsv(struct btrfs_root *root,
			  struct btrfs_block_rsv *rsv);
3262
int btrfs_block_rsv_add(struct btrfs_root *root,
M
Miao Xie 已提交
3263 3264
			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
			enum btrfs_reserve_flush_enum flush);
3265
int btrfs_block_rsv_check(struct btrfs_root *root,
3266 3267
			  struct btrfs_block_rsv *block_rsv, int min_factor);
int btrfs_block_rsv_refill(struct btrfs_root *root,
M
Miao Xie 已提交
3268 3269
			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
			   enum btrfs_reserve_flush_enum flush);
3270 3271 3272
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
			    struct btrfs_block_rsv *dst_rsv,
			    u64 num_bytes);
3273 3274 3275
int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
			     struct btrfs_block_rsv *dest, u64 num_bytes,
			     int min_factor);
3276 3277 3278 3279 3280
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);
3281 3282
void btrfs_set_block_group_rw(struct btrfs_root *root,
			      struct btrfs_block_group_cache *cache);
3283
void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
3284
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
L
liubo 已提交
3285 3286 3287
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,
3288
			       u64 num_bytes, u64 *actual_bytes);
3289 3290
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root, u64 type);
3291
int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
L
liubo 已提交
3292

3293
int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
3294 3295
int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
					 struct btrfs_fs_info *fs_info);
3296
int __get_raid_index(u64 flags);
C
Chris Mason 已提交
3297
/* ctree.c */
3298 3299 3300
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);
3301 3302 3303
int btrfs_previous_item(struct btrfs_root *root,
			struct btrfs_path *path, u64 min_objectid,
			int type);
3304
void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
3305
			     struct btrfs_key *new_key);
3306 3307
struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
3308
int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
3309
			struct btrfs_key *key, int lowest_level,
3310
			u64 min_trans);
3311
int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
3312
			 struct btrfs_path *path,
3313
			 u64 min_trans);
3314 3315 3316 3317
enum btrfs_compare_tree_result {
	BTRFS_COMPARE_TREE_NEW,
	BTRFS_COMPARE_TREE_DELETED,
	BTRFS_COMPARE_TREE_CHANGED,
3318
	BTRFS_COMPARE_TREE_SAME,
3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329
};
typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
				  struct btrfs_root *right_root,
				  struct btrfs_path *left_path,
				  struct btrfs_path *right_path,
				  struct btrfs_key *key,
				  enum btrfs_compare_tree_result result,
				  void *ctx);
int btrfs_compare_trees(struct btrfs_root *left_root,
			struct btrfs_root *right_root,
			btrfs_changed_cb_t cb, void *ctx);
3330 3331 3332
int btrfs_cow_block(struct btrfs_trans_handle *trans,
		    struct btrfs_root *root, struct extent_buffer *buf,
		    struct extent_buffer *parent, int parent_slot,
3333
		    struct extent_buffer **cow_ret);
3334 3335 3336 3337
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);
3338 3339
int btrfs_block_can_be_shared(struct btrfs_root *root,
			      struct extent_buffer *buf);
3340
void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
3341
		       u32 data_size);
3342
void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
3343
			 u32 new_size, int from_end);
3344 3345 3346 3347 3348
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
3349 3350 3351 3352
int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
			 struct btrfs_root *root,
			 struct btrfs_path *path,
			 struct btrfs_key *new_key);
3353 3354 3355
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);
J
Jan Schmidt 已提交
3356 3357
int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
			  struct btrfs_path *p, u64 time_seq);
3358 3359 3360
int btrfs_search_slot_for_read(struct btrfs_root *root,
			       struct btrfs_key *key, struct btrfs_path *p,
			       int find_higher, int return_any);
3361
int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3362
		       struct btrfs_root *root, struct extent_buffer *parent,
3363
		       int start_slot, u64 *last_ret,
3364
		       struct btrfs_key *progress);
3365
void btrfs_release_path(struct btrfs_path *p);
C
Chris Mason 已提交
3366 3367
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
3368
void btrfs_set_path_blocking(struct btrfs_path *p);
3369
void btrfs_clear_path_blocking(struct btrfs_path *p,
3370
			       struct extent_buffer *held, int held_rw);
3371 3372
void btrfs_unlock_up_safe(struct btrfs_path *p, int level);

3373 3374 3375 3376 3377 3378 3379 3380 3381
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);
}

3382
void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
3383 3384
			    struct btrfs_key *cpu_key, u32 *data_size,
			    u32 total_data, u32 total_size, int nr);
3385 3386
int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
		      *root, struct btrfs_key *key, void *data, u32 data_size);
3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
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
3401
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
J
Jan Schmidt 已提交
3402 3403
int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
			u64 time_seq);
3404 3405
static inline int btrfs_next_old_item(struct btrfs_root *root,
				      struct btrfs_path *p, u64 time_seq)
3406 3407 3408
{
	++p->slots[0];
	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3409
		return btrfs_next_old_leaf(root, p, time_seq);
3410 3411
	return 0;
}
3412 3413 3414 3415
static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
{
	return btrfs_next_old_item(root, p, 0);
}
3416
int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
3417 3418 3419
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
3420 3421 3422 3423
int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct extent_buffer *node,
			struct extent_buffer *parent);
3424 3425 3426 3427 3428 3429 3430 3431
static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
{
	/*
	 * Get synced with close_ctree()
	 */
	smp_mb();
	return fs_info->closing;
}
3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443

/*
 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
 * anything except sleeping. This function is used to check the status of
 * the fs.
 */
static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
{
	return (root->fs_info->sb->s_flags & MS_RDONLY ||
		btrfs_fs_closing(root->fs_info));
}

3444 3445
static inline void free_fs_info(struct btrfs_fs_info *fs_info)
{
3446
	kfree(fs_info->balance_ctl);
3447 3448 3449 3450 3451 3452
	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);
3453
	kfree(fs_info->quota_root);
3454
	kfree(fs_info->uuid_root);
3455 3456 3457 3458
	kfree(fs_info->super_copy);
	kfree(fs_info->super_for_commit);
	kfree(fs_info);
}
3459

3460 3461 3462 3463 3464
/* tree mod log functions from ctree.c */
u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
			   struct seq_list *elem);
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
			    struct seq_list *elem);
3465
u64 btrfs_tree_mod_seq_prev(u64 seq);
J
Jan Schmidt 已提交
3466
int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3467

C
Chris Mason 已提交
3468
/* root-item.c */
3469
int btrfs_find_root_ref(struct btrfs_root *tree_root,
3470 3471
			struct btrfs_path *path,
			u64 root_id, u64 ref_id);
3472 3473
int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
		       struct btrfs_root *tree_root,
3474 3475 3476 3477 3478
		       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,
3479
		       const char *name, int name_len);
3480 3481 3482 3483 3484
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);
3485 3486 3487 3488
int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root,
				   struct btrfs_key *key,
				   struct btrfs_root_item *item);
3489 3490 3491
int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
		    struct btrfs_path *path, struct btrfs_root_item *root_item,
		    struct btrfs_key *root_key);
3492
int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
3493 3494
void btrfs_set_root_node(struct btrfs_root_item *item,
			 struct extent_buffer *node);
3495
void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3496 3497
void btrfs_update_root_times(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root);
3498

3499 3500 3501 3502 3503 3504 3505
/* uuid-tree.c */
int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
			struct btrfs_root *uuid_root, u8 *uuid, u8 type,
			u64 subid);
int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
			struct btrfs_root *uuid_root, u8 *uuid, u8 type,
			u64 subid);
3506 3507 3508
int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
			    int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
					      u64));
3509

C
Chris Mason 已提交
3510
/* dir-item.c */
C
Chris Mason 已提交
3511 3512
int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
			  const char *name, int name_len);
C
Chris Mason 已提交
3513 3514
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, const char *name,
3515
			  int name_len, struct inode *dir,
3516
			  struct btrfs_key *location, u8 type, u64 index);
3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527
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);
3528 3529 3530 3531
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);
3532 3533 3534 3535
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
3536
int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3537 3538 3539 3540
			    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
3541 3542 3543 3544 3545
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);
3546 3547 3548
int verify_dir_item(struct btrfs_root *root,
		    struct extent_buffer *leaf,
		    struct btrfs_dir_item *dir_item);
3549 3550 3551 3552 3553 3554

/* 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);
3555
int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3556

C
Chris Mason 已提交
3557
/* inode-item.c */
3558 3559 3560
int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   const char *name, int name_len,
3561
			   u64 inode_objectid, u64 ref_objectid, u64 index);
3562 3563 3564
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   const char *name, int name_len,
3565
			   u64 inode_objectid, u64 ref_objectid, u64 *index);
M
Mark Fasheh 已提交
3566 3567 3568 3569 3570 3571
int btrfs_get_inode_ref_index(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,
			      u64 *ret_index);
3572 3573 3574
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid);
3575
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3576 3577
		       *root, struct btrfs_path *path,
		       struct btrfs_key *location, int mod);
C
Chris Mason 已提交
3578

M
Mark Fasheh 已提交
3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591
struct btrfs_inode_extref *
btrfs_lookup_inode_extref(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 ins_len,
			  int cow);

int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
				   u64 ref_objectid, const char *name,
				   int name_len,
				   struct btrfs_inode_extref **extref_ret);

C
Chris Mason 已提交
3592
/* file-item.c */
3593
struct btrfs_dio_private;
3594 3595
int btrfs_del_csums(struct btrfs_trans_handle *trans,
		    struct btrfs_root *root, u64 bytenr, u64 len);
3596
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3597
			  struct bio *bio, u32 *dst);
3598
int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3599 3600
			      struct btrfs_dio_private *dip, struct bio *bio,
			      u64 logical_offset);
C
Chris Mason 已提交
3601
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
C
Chris Mason 已提交
3602 3603 3604 3605 3606
			     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
3607 3608 3609
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root,
			     struct btrfs_path *path, u64 objectid,
3610
			     u64 bytenr, int mod);
3611
int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3612
			   struct btrfs_root *root,
3613
			   struct btrfs_ordered_sum *sums);
3614
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3615
		       struct bio *bio, u64 file_start, int contig);
A
Arne Jansen 已提交
3616 3617
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
3618
/* inode.c */
3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631
struct btrfs_delalloc_work {
	struct inode *inode;
	int wait;
	int delay_iput;
	struct completion completion;
	struct list_head list;
	struct btrfs_work work;
};

struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
						    int wait, int delay_iput);
void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);

J
Josef Bacik 已提交
3632 3633 3634
struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
					   size_t pg_offset, u64 start, u64 len,
					   int create);
3635
noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3636 3637
			      u64 *orig_start, u64 *orig_block_len,
			      u64 *ram_bytes);
3638 3639

/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3640
#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3641 3642 3643 3644 3645
#define ClearPageChecked ClearPageFsMisc
#define SetPageChecked SetPageFsMisc
#define PageChecked PageFsMisc
#endif

L
Li Zefan 已提交
3646 3647 3648 3649 3650 3651 3652 3653
/* 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);
}

3654 3655
struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
int btrfs_set_inode_index(struct inode *dir, u64 *index);
3656 3657 3658 3659 3660 3661 3662
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);
3663 3664 3665 3666
int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct inode *dir, u64 objectid,
			const char *name, int name_len);
J
Josef Bacik 已提交
3667 3668
int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
			int front);
3669 3670 3671 3672 3673
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
3674
int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3675
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput);
3676 3677
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
			      struct extent_state **cached_state);
3678
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3679
			     struct btrfs_root *new_root, u64 new_dirid);
3680 3681 3682
int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
			 size_t size, struct bio *bio,
			 unsigned long bio_flags);
3683
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
C
Chris Mason 已提交
3684
int btrfs_readpage(struct file *file, struct page *page);
A
Al Viro 已提交
3685
void btrfs_evict_inode(struct inode *inode);
3686
int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
C
Chris Mason 已提交
3687 3688
struct inode *btrfs_alloc_inode(struct super_block *sb);
void btrfs_destroy_inode(struct inode *inode);
3689
int btrfs_drop_inode(struct inode *inode);
C
Chris Mason 已提交
3690 3691
int btrfs_init_cachep(void);
void btrfs_destroy_cachep(void);
S
Sage Weil 已提交
3692
long btrfs_ioctl_trans_end(struct file *file);
B
Balaji Rao 已提交
3693
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3694
			 struct btrfs_root *root, int *was_new);
3695
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3696
				    size_t pg_offset, u64 start, u64 end,
3697 3698 3699 3700
				    int create);
int btrfs_update_inode(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root,
			      struct inode *inode);
3701 3702
int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
				struct btrfs_root *root, struct inode *inode);
3703
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3704
int btrfs_orphan_cleanup(struct btrfs_root *root);
3705 3706
void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
			      struct btrfs_root *root);
3707
int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3708
void btrfs_invalidate_inodes(struct btrfs_root *root);
Y
Yan, Zheng 已提交
3709 3710
void btrfs_add_delayed_iput(struct inode *inode);
void btrfs_run_delayed_iputs(struct btrfs_root *root);
3711 3712 3713
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);
3714 3715 3716 3717
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);
3718
extern const struct dentry_operations btrfs_dentry_operations;
C
Christoph Hellwig 已提交
3719 3720 3721

/* ioctl.c */
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3722 3723
void btrfs_update_iflags(struct inode *inode);
void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3724
int btrfs_is_empty_uuid(u8 *uuid);
C
Chris Mason 已提交
3725 3726 3727
int btrfs_defrag_file(struct inode *inode, struct file *file,
		      struct btrfs_ioctl_defrag_range_args *range,
		      u64 newer_than, unsigned long max_pages);
3728 3729
void btrfs_get_block_group_info(struct list_head *groups_list,
				struct btrfs_ioctl_space_info *space);
3730 3731 3732
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
			       struct btrfs_ioctl_balance_args *bargs);

3733

C
Chris Mason 已提交
3734
/* file.c */
3735 3736
int btrfs_auto_defrag_init(void);
void btrfs_auto_defrag_exit(void);
C
Chris Mason 已提交
3737 3738 3739
int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
			   struct inode *inode);
int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3740
void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3741
int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3742 3743
void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
			     int skip_pinned);
3744
extern const struct file_operations btrfs_file_operations;
J
Josef Bacik 已提交
3745 3746 3747
int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
			 struct btrfs_root *root, struct inode *inode,
			 struct btrfs_path *path, u64 start, u64 end,
J
Josef Bacik 已提交
3748
			 u64 *drop_end, int drop_cache);
J
Josef Bacik 已提交
3749 3750
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
		       struct btrfs_root *root, struct inode *inode, u64 start,
3751
		       u64 end, int drop_cache);
Y
Yan Zheng 已提交
3752 3753
int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
			      struct inode *inode, u64 start, u64 end);
S
Sage Weil 已提交
3754
int btrfs_release_file(struct inode *inode, struct file *file);
3755 3756 3757 3758
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
3759

3760 3761
/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3762
			struct btrfs_root *root);
3763 3764 3765 3766 3767

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

J
Josef Bacik 已提交
3768 3769
/* xattr.c */
ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
J
Josef Bacik 已提交
3770

3771
/* super.c */
3772
int btrfs_parse_options(struct btrfs_root *root, char *options);
S
Sage Weil 已提交
3773
int btrfs_sync_fs(struct super_block *sb, int wait);
3774 3775 3776

#ifdef CONFIG_PRINTK
__printf(2, 3)
3777
void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3778 3779
#else
static inline __printf(2, 3)
3780
void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3781 3782 3783 3784
{
}
#endif

3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801
#define btrfs_emerg(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
#define btrfs_alert(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
#define btrfs_crit(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
#define btrfs_err(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
#define btrfs_warn(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
#define btrfs_notice(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
#define btrfs_info(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
#define btrfs_debug(fs_info, fmt, args...) \
	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)

J
Josef Bacik 已提交
3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817
#ifdef CONFIG_BTRFS_ASSERT

static inline void assfail(char *expr, char *file, int line)
{
	printk(KERN_ERR "BTRFS assertion failed: %s, file: %s, line: %d",
	       expr, file, line);
	BUG();
}

#define ASSERT(expr)	\
	(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
#else
#define ASSERT(expr)	((void)0)
#endif

#define btrfs_assert()
3818
__printf(5, 6)
L
liubo 已提交
3819
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
J
Jeff Mahoney 已提交
3820
		     unsigned int line, int errno, const char *fmt, ...);
L
liubo 已提交
3821

3822

3823 3824 3825 3826
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, const char *function,
			       unsigned int line, int errno);

3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838
#define btrfs_set_fs_incompat(__fs_info, opt) \
	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)

static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
					   u64 flag)
{
	struct btrfs_super_block *disk_super;
	u64 features;

	disk_super = fs_info->super_copy;
	features = btrfs_super_incompat_flags(disk_super);
	if (!(features & flag)) {
3839 3840 3841 3842 3843 3844 3845 3846 3847
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_incompat_flags(disk_super);
		if (!(features & flag)) {
			features |= flag;
			btrfs_set_super_incompat_flags(disk_super, features);
			printk(KERN_INFO "btrfs: setting %llu feature flag\n",
					 flag);
		}
		spin_unlock(&fs_info->super_lock);
3848 3849 3850
	}
}

3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
#define btrfs_fs_incompat(fs_info, opt) \
	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)

static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
{
	struct btrfs_super_block *disk_super;
	disk_super = fs_info->super_copy;
	return !!(btrfs_super_incompat_flags(disk_super) & flag);
}

3861 3862 3863 3864 3865
/*
 * Call btrfs_abort_transaction as early as possible when an error condition is
 * detected, that way the exact line number is reported.
 */

3866 3867 3868 3869 3870
#define btrfs_abort_transaction(trans, root, errno)		\
do {								\
	__btrfs_abort_transaction(trans, root, __func__,	\
				  __LINE__, errno);		\
} while (0)
L
liubo 已提交
3871 3872 3873 3874

#define btrfs_std_error(fs_info, errno)				\
do {								\
	if ((errno))						\
J
Jeff Mahoney 已提交
3875 3876 3877 3878 3879 3880 3881 3882
		__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);		\
L
liubo 已提交
3883
} while (0)
J
Josef Bacik 已提交
3884

3885
__printf(5, 6)
J
Jeff Mahoney 已提交
3886 3887 3888
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
		   unsigned int line, int errno, const char *fmt, ...);

3889 3890 3891 3892
/*
 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
 * will panic().  Otherwise we BUG() here.
 */
J
Jeff Mahoney 已提交
3893 3894
#define btrfs_panic(fs_info, errno, fmt, args...)			\
do {									\
3895 3896
	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
	BUG();								\
L
liubo 已提交
3897
} while (0)
J
Josef Bacik 已提交
3898 3899

/* acl.c */
C
Chris Mason 已提交
3900
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
3901
struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3902 3903
int btrfs_init_acl(struct btrfs_trans_handle *trans,
		   struct inode *inode, struct inode *dir);
J
Josef Bacik 已提交
3904
int btrfs_acl_chmod(struct inode *inode);
3905
#else
3906
#define btrfs_get_acl NULL
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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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/* 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);
3926 3927 3928
int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, struct extent_buffer *buf,
			  struct extent_buffer *cow);
3929 3930 3931
void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
			      struct btrfs_pending_snapshot *pending,
			      u64 *bytes_to_reserve);
3932
int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3933
			      struct btrfs_pending_snapshot *pending);
A
Arne Jansen 已提交
3934 3935

/* scrub.c */
3936 3937
int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
		    u64 end, struct btrfs_scrub_progress *progress,
3938
		    int readonly, int is_dev_replace);
3939 3940
void btrfs_scrub_pause(struct btrfs_root *root);
void btrfs_scrub_continue(struct btrfs_root *root);
3941 3942 3943
int btrfs_scrub_cancel(struct btrfs_fs_info *info);
int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
			   struct btrfs_device *dev);
A
Arne Jansen 已提交
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int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
			 struct btrfs_scrub_progress *progress);

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/* 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);

3963 3964
/* qgroup.c */
struct qgroup_update {
3965
	struct list_head list;
3966 3967
	struct btrfs_delayed_ref_node *node;
	struct btrfs_delayed_extent_op *extent_op;
3968 3969
};

3970 3971 3972 3973
int btrfs_quota_enable(struct btrfs_trans_handle *trans,
		       struct btrfs_fs_info *fs_info);
int btrfs_quota_disable(struct btrfs_trans_handle *trans,
			struct btrfs_fs_info *fs_info);
J
Jan Schmidt 已提交
3974
int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
3975
void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
3976
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
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int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
			struct btrfs_fs_info *fs_info, u64 qgroupid,
			char *name);
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *fs_info, u64 qgroupid);
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
		       struct btrfs_fs_info *fs_info, u64 qgroupid,
		       struct btrfs_qgroup_limit *limit);
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
struct btrfs_delayed_extent_op;
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
			    struct btrfs_delayed_ref_node *node,
			    struct btrfs_delayed_extent_op *extent_op);
int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
			     struct btrfs_fs_info *fs_info,
			     struct btrfs_delayed_ref_node *node,
			     struct btrfs_delayed_extent_op *extent_op);
int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
		      struct btrfs_fs_info *fs_info);
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
			 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
			 struct btrfs_qgroup_inherit *inherit);
int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);

void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
4008

4009 4010 4011 4012 4013 4014 4015
static inline int is_fstree(u64 rootid)
{
	if (rootid == BTRFS_FS_TREE_OBJECTID ||
	    (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
		return 1;
	return 0;
}
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static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
{
	return signal_pending(current);
}

4022 4023 4024 4025
/* Sanity test specific functions */
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
void btrfs_test_destroy_inode(struct inode *inode);
#endif
4026

4027
#endif