[mirror_ubuntu-artful-kernel.git] / fs / btrfs / volumes.h

/*
 * 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.
 */

#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_

#include <linux/bio.h>
#include <linux/sort.h>
#include <linux/btrfs.h>
#include "async-thread.h"

#define BTRFS_STRIPE_LEN	(64 * 1024)

struct buffer_head;
struct btrfs_pending_bios {
	struct bio *head;
	struct bio *tail;
};

struct btrfs_device {
	struct list_head dev_list;
	struct list_head dev_alloc_list;
	struct btrfs_fs_devices *fs_devices;

	struct btrfs_root *dev_root;

	struct rcu_string *name;

	u64 generation;

	spinlock_t io_lock ____cacheline_aligned;
	int running_pending;
	/* regular prio bios */
	struct btrfs_pending_bios pending_bios;
	/* WRITE_SYNC bios */
	struct btrfs_pending_bios pending_sync_bios;

	struct block_device *bdev;

	/* the mode sent to blkdev_get */
	fmode_t mode;

	int writeable;
	int in_fs_metadata;
	int missing;
	int can_discard;
	int is_tgtdev_for_dev_replace;

	/* the internal btrfs device id */
	u64 devid;

	/* size of the device in memory */
	u64 total_bytes;

	/* size of the device on disk */
	u64 disk_total_bytes;

	/* bytes used */
	u64 bytes_used;

	/* optimal io alignment for this device */
	u32 io_align;

	/* optimal io width for this device */
	u32 io_width;
	/* type and info about this device */
	u64 type;

	/* minimal io size for this device */
	u32 sector_size;

	/* physical drive uuid (or lvm uuid) */
	u8 uuid[BTRFS_UUID_SIZE];

	/*
	 * size of the device on the current transaction
	 *
	 * This variant is update when committing the transaction,
	 * and protected by device_list_mutex
	 */
	u64 commit_total_bytes;

	/* bytes used on the current transaction */
	u64 commit_bytes_used;
	/*
	 * used to manage the device which is resized
	 *
	 * It is protected by chunk_lock.
	 */
	struct list_head resized_list;

	/* for sending down flush barriers */
	int nobarriers;
	struct bio *flush_bio;
	struct completion flush_wait;

	/* per-device scrub information */
	struct scrub_ctx *scrub_device;

	struct btrfs_work work;
	struct rcu_head rcu;
	struct work_struct rcu_work;

	/* readahead state */
	spinlock_t reada_lock;
	atomic_t reada_in_flight;
	u64 reada_next;
	struct reada_zone *reada_curr_zone;
	struct radix_tree_root reada_zones;
	struct radix_tree_root reada_extents;

	/* disk I/O failure stats. For detailed description refer to
	 * enum btrfs_dev_stat_values in ioctl.h */
	int dev_stats_valid;

	/* Counter to record the change of device stats */
	atomic_t dev_stats_ccnt;
	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
};

struct btrfs_fs_devices {
	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */

	u64 num_devices;
	u64 open_devices;
	u64 rw_devices;
	u64 missing_devices;
	u64 total_rw_bytes;
	u64 total_devices;
	struct block_device *latest_bdev;

	/* all of the devices in the FS, protected by a mutex
	 * so we can safely walk it to write out the supers without
	 * worrying about add/remove by the multi-device code.
	 * Scrubbing super can kick off supers writing by holding
	 * this mutex lock.
	 */
	struct mutex device_list_mutex;
	struct list_head devices;

	struct list_head resized_devices;
	/* devices not currently being allocated */
	struct list_head alloc_list;
	struct list_head list;

	struct btrfs_fs_devices *seed;
	int seeding;

	int opened;

	/* set when we find or add a device that doesn't have the
	 * nonrot flag set
	 */
	int rotating;
};

#define BTRFS_BIO_INLINE_CSUM_SIZE	64

/*
 * we need the mirror number and stripe index to be passed around
 * the call chain while we are processing end_io (especially errors).
 * Really, what we need is a btrfs_bio structure that has this info
 * and is properly sized with its stripe array, but we're not there
 * quite yet.  We have our own btrfs bioset, and all of the bios
 * we allocate are actually btrfs_io_bios.  We'll cram as much of
 * struct btrfs_bio as we can into this over time.
 */
typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
struct btrfs_io_bio {
	unsigned long mirror_num;
	unsigned long stripe_index;
	u8 *csum;
	u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
	u8 *csum_allocated;
	btrfs_io_bio_end_io_t *end_io;
	struct bio bio;
};

static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
{
	return container_of(bio, struct btrfs_io_bio, bio);
}

struct btrfs_bio_stripe {
	struct btrfs_device *dev;
	u64 physical;
	u64 length; /* only used for discard mappings */
};

struct btrfs_bio;
typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);

#define BTRFS_BIO_ORIG_BIO_SUBMITTED	0x1

struct btrfs_bio {
	atomic_t stripes_pending;
	struct btrfs_fs_info *fs_info;
	bio_end_io_t *end_io;
	struct bio *orig_bio;
	unsigned long flags;
	void *private;
	atomic_t error;
	int max_errors;
	int num_stripes;
	int mirror_num;
	struct btrfs_bio_stripe stripes[];
};

struct btrfs_device_info {
	struct btrfs_device *dev;
	u64 dev_offset;
	u64 max_avail;
	u64 total_avail;
};

struct btrfs_raid_attr {
	int sub_stripes;	/* sub_stripes info for map */
	int dev_stripes;	/* stripes per dev */
	int devs_max;		/* max devs to use */
	int devs_min;		/* min devs needed */
	int devs_increment;	/* ndevs has to be a multiple of this */
	int ncopies;		/* how many copies to data has */
};

struct map_lookup {
	u64 type;
	int io_align;
	int io_width;
	int stripe_len;
	int sector_size;
	int num_stripes;
	int sub_stripes;
	struct btrfs_bio_stripe stripes[];
};

#define map_lookup_size(n) (sizeof(struct map_lookup) + \
			    (sizeof(struct btrfs_bio_stripe) * (n)))

/*
 * Restriper's general type filter
 */
#define BTRFS_BALANCE_DATA		(1ULL << 0)
#define BTRFS_BALANCE_SYSTEM		(1ULL << 1)
#define BTRFS_BALANCE_METADATA		(1ULL << 2)

#define BTRFS_BALANCE_TYPE_MASK		(BTRFS_BALANCE_DATA |	    \
					 BTRFS_BALANCE_SYSTEM |	    \
					 BTRFS_BALANCE_METADATA)

#define BTRFS_BALANCE_FORCE		(1ULL << 3)
#define BTRFS_BALANCE_RESUME		(1ULL << 4)

/*
 * Balance filters
 */
#define BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)
#define BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)
#define BTRFS_BALANCE_ARGS_DEVID	(1ULL << 2)
#define BTRFS_BALANCE_ARGS_DRANGE	(1ULL << 3)
#define BTRFS_BALANCE_ARGS_VRANGE	(1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT	(1ULL << 5)

/*
 * Profile changing flags.  When SOFT is set we won't relocate chunk if
 * it already has the target profile (even though it may be
 * half-filled).
 */
#define BTRFS_BALANCE_ARGS_CONVERT	(1ULL << 8)
#define BTRFS_BALANCE_ARGS_SOFT		(1ULL << 9)

struct btrfs_balance_args;
struct btrfs_balance_progress;
struct btrfs_balance_control {
	struct btrfs_fs_info *fs_info;

	struct btrfs_balance_args data;
	struct btrfs_balance_args meta;
	struct btrfs_balance_args sys;

	u64 flags;

	struct btrfs_balance_progress stat;
};

int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
				   u64 end, u64 *length);

#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
			    (sizeof(struct btrfs_bio_stripe) * (n)))

int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
		    u64 logical, u64 *length,
		    struct btrfs_bio **bbio_ret, int mirror_num);
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
		     u64 chunk_start, u64 physical, u64 devid,
		     u64 **logical, int *naddrs, int *stripe_len);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
		      struct btrfs_root *extent_root, u64 type);
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
		  int mirror_num, int async_submit);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
		       fmode_t flags, void *holder);
int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
			  struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
			       struct btrfs_fs_devices *fs_devices, int step);
int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
					 char *device_path,
					 struct btrfs_device **device);
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
					const u64 *devid,
					const u8 *uuid);
int btrfs_rm_device(struct btrfs_root *root, char *device_path);
void btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
int btrfs_grow_device(struct btrfs_trans_handle *trans,
		      struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
				       u8 *uuid, u8 *fsid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
				  struct btrfs_device *srcdev,
				  struct btrfs_device **device_out);
int btrfs_balance(struct btrfs_balance_control *bctl,
		  struct btrfs_ioctl_balance_args *bargs);
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
int find_free_dev_extent(struct btrfs_trans_handle *trans,
			 struct btrfs_device *device, u64 num_bytes,
			 u64 *start, u64 *max_avail);
void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
int btrfs_get_dev_stats(struct btrfs_root *root,
			struct btrfs_ioctl_get_dev_stats *stats);
void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
			struct btrfs_fs_info *fs_info);
void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
				 struct btrfs_device *srcdev);
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
				      struct btrfs_device *tgtdev);
void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
					      struct btrfs_device *tgtdev);
int btrfs_scratch_superblock(struct btrfs_device *device);
int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
			   u64 logical, u64 len, int mirror_num);
unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
				    struct btrfs_mapping_tree *map_tree,
				    u64 logical);
int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
				struct btrfs_root *extent_root,
				u64 chunk_offset, u64 chunk_size);

static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
{
	return atomic_read(&dev->dev_stats_ccnt);
}

static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
				      int index)
{
	atomic_inc(dev->dev_stat_values + index);
	smp_mb__before_atomic();
	atomic_inc(&dev->dev_stats_ccnt);
}

static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
				      int index)
{
	return atomic_read(dev->dev_stat_values + index);
}

static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
						int index)
{
	int ret;

	ret = atomic_xchg(dev->dev_stat_values + index, 0);
	smp_mb__before_atomic();
	atomic_inc(&dev->dev_stats_ccnt);
	return ret;
}

static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
				      int index, unsigned long val)
{
	atomic_set(dev->dev_stat_values + index, val);
	smp_mb__before_atomic();
	atomic_inc(&dev->dev_stats_ccnt);
}

static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
					int index)
{
	btrfs_dev_stat_set(dev, index, 0);
}

void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
					struct btrfs_transaction *transaction);
#endif
Commit	Line	Data
0b86a832 CM	1	/*
	2	* Copyright (C) 2007 Oracle. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public
	6	* License v2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public
	14	* License along with this program; if not, write to the
	15	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	16	* Boston, MA 021110-1307, USA.
	17	*/
	18
	19	#ifndef __BTRFS_VOLUMES_
	20	#define __BTRFS_VOLUMES_
8790d502	21
cea9e445	22	#include <linux/bio.h>
b2117a39	23	#include <linux/sort.h>
55e301fd	24	#include <linux/btrfs.h>
8b712842	25	#include "async-thread.h"
cea9e445	26
b2117a39 MX	27	#define BTRFS_STRIPE_LEN (64 * 1024)
b2117a39 MX	28
f2984462	29	struct buffer_head;
ffbd517d CM	30	struct btrfs_pending_bios {
	31	struct bio *head;
	32	struct bio *tail;
	33	};
	34
0b86a832 CM	35	struct btrfs_device {
0b86a832 CM	36	struct list_head dev_list;
b3075717	37	struct list_head dev_alloc_list;
2b82032c	38	struct btrfs_fs_devices *fs_devices;
d5ee37bc	39
0b86a832	40	struct btrfs_root *dev_root;
ffbd517d	41
d5ee37bc MX	42	struct rcu_string *name;
	43
	44	u64 generation;
	45
	46	spinlock_t io_lock ____cacheline_aligned;
	47	int running_pending;
ffbd517d CM	48	/* regular prio bios */
	49	struct btrfs_pending_bios pending_bios;
	50	/* WRITE_SYNC bios */
	51	struct btrfs_pending_bios pending_sync_bios;
	52
d5ee37bc MX	53	struct block_device *bdev;
	54
	55	/* the mode sent to blkdev_get */
	56	fmode_t mode;
	57
2b82032c	58	int writeable;
dfe25020	59	int in_fs_metadata;
cd02dca5	60	int missing;
d5e2003c	61	int can_discard;
63a212ab	62	int is_tgtdev_for_dev_replace;
b3075717	63
0b86a832 CM	64	/* the internal btrfs device id */
	65	u64 devid;
	66
6ba40b61	67	/* size of the device in memory */
0b86a832 CM	68	u64 total_bytes;
0b86a832 CM	69
6ba40b61	70	/* size of the device on disk */
d6397bae CB	71	u64 disk_total_bytes;
d6397bae CB	72
0b86a832 CM	73	/* bytes used */
	74	u64 bytes_used;
	75
	76	/* optimal io alignment for this device */
	77	u32 io_align;
	78
	79	/* optimal io width for this device */
	80	u32 io_width;
3c45bfc1 DG	81	/* type and info about this device */
3c45bfc1 DG	82	u64 type;
0b86a832 CM	83
	84	/* minimal io size for this device */
	85	u32 sector_size;
	86
0b86a832	87	/* physical drive uuid (or lvm uuid) */
e17cade2	88	u8 uuid[BTRFS_UUID_SIZE];
8b712842	89
935e5cc9 MX	90	/*
	91	* size of the device on the current transaction
	92	*
	93	* This variant is update when committing the transaction,
	94	* and protected by device_list_mutex
	95	*/
	96	u64 commit_total_bytes;
	97
ce7213c7 MX	98	/* bytes used on the current transaction */
ce7213c7 MX	99	u64 commit_bytes_used;
935e5cc9 MX	100	/*
	101	* used to manage the device which is resized
	102	*
	103	* It is protected by chunk_lock.
	104	*/
	105	struct list_head resized_list;
	106
3c45bfc1 DG	107	/* for sending down flush barriers */
	108	int nobarriers;
	109	struct bio *flush_bio;
	110	struct completion flush_wait;
	111
a2de733c	112	/* per-device scrub information */
d9d181c1	113	struct scrub_ctx *scrub_device;
a2de733c	114
d458b054	115	struct btrfs_work work;
1f78160c XG	116	struct rcu_head rcu;
1f78160c XG	117	struct work_struct rcu_work;
90519d66 AJ	118
	119	/* readahead state */
	120	spinlock_t reada_lock;
	121	atomic_t reada_in_flight;
	122	u64 reada_next;
	123	struct reada_zone *reada_curr_zone;
	124	struct radix_tree_root reada_zones;
	125	struct radix_tree_root reada_extents;
387125fc	126
442a4f63 SB	127	/* disk I/O failure stats. For detailed description refer to
442a4f63 SB	128	* enum btrfs_dev_stat_values in ioctl.h */
733f4fbb	129	int dev_stats_valid;
addc3fa7 MX	130
	131	/* Counter to record the change of device stats */
	132	atomic_t dev_stats_ccnt;
442a4f63	133	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
0b86a832 CM	134	};
0b86a832 CM	135
8a4b83cc CM	136	struct btrfs_fs_devices {
	137	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	138
8a4b83cc	139	u64 num_devices;
a0af469b	140	u64 open_devices;
2b82032c	141	u64 rw_devices;
cd02dca5	142	u64 missing_devices;
2b82032c	143	u64 total_rw_bytes;
02db0844	144	u64 total_devices;
8a4b83cc	145	struct block_device *latest_bdev;
e5e9a520 CM	146
	147	/* all of the devices in the FS, protected by a mutex
	148	* so we can safely walk it to write out the supers without
9b011adf WS	149	* worrying about add/remove by the multi-device code.
	150	* Scrubbing super can kick off supers writing by holding
	151	* this mutex lock.
e5e9a520 CM	152	*/
e5e9a520 CM	153	struct mutex device_list_mutex;
8a4b83cc	154	struct list_head devices;
b3075717	155
935e5cc9	156	struct list_head resized_devices;
b3075717 CM	157	/* devices not currently being allocated */
b3075717 CM	158	struct list_head alloc_list;
8a4b83cc	159	struct list_head list;
2b82032c YZ	160
	161	struct btrfs_fs_devices *seed;
	162	int seeding;
2b82032c YZ	163
2b82032c YZ	164	int opened;
c289811c CM	165
	166	/* set when we find or add a device that doesn't have the
	167	* nonrot flag set
	168	*/
	169	int rotating;
8a4b83cc CM	170	};
8a4b83cc CM	171
facc8a22 MX	172	#define BTRFS_BIO_INLINE_CSUM_SIZE 64
facc8a22 MX	173
9be3395b CM	174	/*
	175	* we need the mirror number and stripe index to be passed around
	176	* the call chain while we are processing end_io (especially errors).
	177	* Really, what we need is a btrfs_bio structure that has this info
	178	* and is properly sized with its stripe array, but we're not there
	179	* quite yet. We have our own btrfs bioset, and all of the bios
	180	* we allocate are actually btrfs_io_bios. We'll cram as much of
	181	* struct btrfs_bio as we can into this over time.
	182	*/
facc8a22	183	typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
9be3395b CM	184	struct btrfs_io_bio {
	185	unsigned long mirror_num;
	186	unsigned long stripe_index;
facc8a22 MX	187	u8 *csum;
	188	u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
	189	u8 *csum_allocated;
	190	btrfs_io_bio_end_io_t *end_io;
9be3395b CM	191	struct bio bio;
	192	};
	193
	194	static inline struct btrfs_io_bio btrfs_io_bio(struct bio bio)
	195	{
	196	return container_of(bio, struct btrfs_io_bio, bio);
	197	}
	198
cea9e445 CM	199	struct btrfs_bio_stripe {
	200	struct btrfs_device *dev;
	201	u64 physical;
fce3bb9a	202	u64 length; /* only used for discard mappings */
cea9e445 CM	203	};
cea9e445 CM	204
a1d3c478 JS	205	struct btrfs_bio;
	206	typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
	207
c55f1396 MX	208	#define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
c55f1396 MX	209
a1d3c478	210	struct btrfs_bio {
cea9e445	211	atomic_t stripes_pending;
c404e0dc	212	struct btrfs_fs_info *fs_info;
cea9e445	213	bio_end_io_t *end_io;
7d2b4daa	214	struct bio *orig_bio;
c55f1396	215	unsigned long flags;
cea9e445	216	void *private;
a236aed1 CM	217	atomic_t error;
a236aed1 CM	218	int max_errors;
cea9e445	219	int num_stripes;
a1d3c478	220	int mirror_num;
cea9e445 CM	221	struct btrfs_bio_stripe stripes[];
	222	};
	223
b2117a39 MX	224	struct btrfs_device_info {
	225	struct btrfs_device *dev;
	226	u64 dev_offset;
	227	u64 max_avail;
73c5de00	228	u64 total_avail;
b2117a39 MX	229	};
b2117a39 MX	230
31e50229 LB	231	struct btrfs_raid_attr {
	232	int sub_stripes; /* sub_stripes info for map */
	233	int dev_stripes; /* stripes per dev */
	234	int devs_max; /* max devs to use */
	235	int devs_min; /* min devs needed */
	236	int devs_increment; /* ndevs has to be a multiple of this */
	237	int ncopies; /* how many copies to data has */
	238	};
	239
1abe9b8a	240	struct map_lookup {
	241	u64 type;
	242	int io_align;
	243	int io_width;
	244	int stripe_len;
	245	int sector_size;
	246	int num_stripes;
	247	int sub_stripes;
	248	struct btrfs_bio_stripe stripes[];
	249	};
	250
a2de733c AJ	251	#define map_lookup_size(n) (sizeof(struct map_lookup) + \
	252	(sizeof(struct btrfs_bio_stripe) * (n)))
	253
f43ffb60 ID	254	/*
	255	* Restriper's general type filter
	256	*/
	257	#define BTRFS_BALANCE_DATA (1ULL << 0)
	258	#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
	259	#define BTRFS_BALANCE_METADATA (1ULL << 2)
	260
	261	#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA \| \
	262	BTRFS_BALANCE_SYSTEM \| \
	263	BTRFS_BALANCE_METADATA)
e4d8ec0f ID	264
e4d8ec0f ID	265	#define BTRFS_BALANCE_FORCE (1ULL << 3)
59641015	266	#define BTRFS_BALANCE_RESUME (1ULL << 4)
e4d8ec0f	267
ed25e9b2 ID	268	/*
	269	* Balance filters
	270	*/
	271	#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
5ce5b3c0	272	#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
409d404b	273	#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
94e60d5a	274	#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
ea67176a	275	#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
7d824b6f	276	#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
f43ffb60	277
cfa4c961 ID	278	/*
	279	* Profile changing flags. When SOFT is set we won't relocate chunk if
	280	* it already has the target profile (even though it may be
	281	* half-filled).
	282	*/
e4d8ec0f	283	#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
cfa4c961	284	#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
e4d8ec0f	285
c9e9f97b	286	struct btrfs_balance_args;
19a39dce	287	struct btrfs_balance_progress;
c9e9f97b ID	288	struct btrfs_balance_control {
	289	struct btrfs_fs_info *fs_info;
	290
	291	struct btrfs_balance_args data;
	292	struct btrfs_balance_args meta;
	293	struct btrfs_balance_args sys;
	294
	295	u64 flags;
19a39dce ID	296
19a39dce ID	297	struct btrfs_balance_progress stat;
c9e9f97b ID	298	};
c9e9f97b ID	299
6d07bcec MX	300	int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
	301	u64 end, u64 *length);
	302
a1d3c478	303	#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
cea9e445 CM	304	(sizeof(struct btrfs_bio_stripe) * (n)))
cea9e445 CM	305
3ec706c8	306	int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
cea9e445	307	u64 logical, u64 *length,
a1d3c478	308	struct btrfs_bio **bbio_ret, int mirror_num);
a512bbf8 YZ	309	int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
	310	u64 chunk_start, u64 physical, u64 devid,
	311	u64 *logical, int naddrs, int *stripe_len);
e4404d6e	312	int btrfs_read_sys_array(struct btrfs_root *root);
0b86a832 CM	313	int btrfs_read_chunk_tree(struct btrfs_root *root);
0b86a832 CM	314	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c	315	struct btrfs_root *extent_root, u64 type);
0b86a832 CM	316	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	317	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e	318	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
8b712842	319	int mirror_num, int async_submit);
8a4b83cc	320	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
97288f2c CH	321	fmode_t flags, void *holder);
97288f2c CH	322	int btrfs_scan_one_device(const char path, fmode_t flags, void holder,
8a4b83cc CM	323	struct btrfs_fs_devices **fs_devices_ret);
8a4b83cc CM	324	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
8dabb742 SB	325	void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
8dabb742 SB	326	struct btrfs_fs_devices *fs_devices, int step);
7ba15b7d SB	327	int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
	328	char *device_path,
	329	struct btrfs_device **device);
12bd2fc0 ID	330	struct btrfs_device btrfs_alloc_device(struct btrfs_fs_info fs_info,
	331	const u64 *devid,
	332	const u8 *uuid);
a061fc8d	333	int btrfs_rm_device(struct btrfs_root root, char device_path);
143bede5	334	void btrfs_cleanup_fs_uuids(void);
5d964051	335	int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
8f18cf13 CM	336	int btrfs_grow_device(struct btrfs_trans_handle *trans,
8f18cf13 CM	337	struct btrfs_device *device, u64 new_size);
aa1b8cd4	338	struct btrfs_device btrfs_find_device(struct btrfs_fs_info fs_info, u64 devid,
2b82032c	339	u8 uuid, u8 fsid);
8f18cf13	340	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb	341	int btrfs_init_new_device(struct btrfs_root root, char path);
e93c89c1	342	int btrfs_init_dev_replace_tgtdev(struct btrfs_root root, char device_path,
1c43366d	343	struct btrfs_device *srcdev,
e93c89c1	344	struct btrfs_device **device_out);
c9e9f97b ID	345	int btrfs_balance(struct btrfs_balance_control *bctl,
c9e9f97b ID	346	struct btrfs_ioctl_balance_args *bargs);
2b6ba629	347	int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
68310a5e	348	int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
837d5b6e	349	int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
a7e99c69	350	int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
f7a81ea4	351	int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
70f80175	352	int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
2b82032c	353	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
6df9a95e JB	354	int find_free_dev_extent(struct btrfs_trans_handle *trans,
6df9a95e JB	355	struct btrfs_device *device, u64 num_bytes,
ba1bf481	356	u64 start, u64 max_avail);
442a4f63	357	void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
c11d2c23	358	int btrfs_get_dev_stats(struct btrfs_root *root,
b27f7c0c	359	struct btrfs_ioctl_get_dev_stats *stats);
cb517eab	360	void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
733f4fbb SB	361	int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
	362	int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
	363	struct btrfs_fs_info *fs_info);
e93c89c1 SB	364	void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
	365	struct btrfs_device *srcdev);
	366	void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
	367	struct btrfs_device *tgtdev);
	368	void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
	369	struct btrfs_device *tgtdev);
a8a6dab7	370	int btrfs_scratch_superblock(struct btrfs_device *device);
53b381b3 DW	371	int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
	372	u64 logical, u64 len, int mirror_num);
	373	unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
	374	struct btrfs_mapping_tree *map_tree,
	375	u64 logical);
6df9a95e JB	376	int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
	377	struct btrfs_root *extent_root,
	378	u64 chunk_offset, u64 chunk_size);
addc3fa7 MX	379
	380	static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
	381	{
	382	return atomic_read(&dev->dev_stats_ccnt);
	383	}
	384
442a4f63 SB	385	static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
	386	int index)
	387	{
	388	atomic_inc(dev->dev_stat_values + index);
addc3fa7 MX	389	smp_mb__before_atomic();
addc3fa7 MX	390	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	391	}
	392
	393	static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
	394	int index)
	395	{
	396	return atomic_read(dev->dev_stat_values + index);
	397	}
	398
	399	static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
	400	int index)
	401	{
	402	int ret;
	403
	404	ret = atomic_xchg(dev->dev_stat_values + index, 0);
addc3fa7 MX	405	smp_mb__before_atomic();
addc3fa7 MX	406	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	407	return ret;
	408	}
	409
	410	static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
	411	int index, unsigned long val)
	412	{
	413	atomic_set(dev->dev_stat_values + index, val);
addc3fa7 MX	414	smp_mb__before_atomic();
addc3fa7 MX	415	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	416	}
	417
	418	static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
	419	int index)
	420	{
	421	btrfs_dev_stat_set(dev, index, 0);
	422	}
935e5cc9 MX	423
935e5cc9 MX	424	void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
ce7213c7 MX	425	void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
ce7213c7 MX	426	struct btrfs_transaction *transaction);
0b86a832	427	#endif