[deliverable/linux.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;

	/* regular prio bios */
	struct btrfs_pending_bios pending_bios;
	/* WRITE_SYNC bios */
	struct btrfs_pending_bios pending_sync_bios;

	u64 generation;
	int running_pending;
	int writeable;
	int in_fs_metadata;
	int missing;
	int can_discard;
	int is_tgtdev_for_dev_replace;

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

	struct block_device *bdev;


	struct rcu_string *name;

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

	/* size of the device */
	u64 total_bytes;

	/* size of the 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];

	/* 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;
	int dev_stats_dirty; /* counters need to be written to disk */
	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
};

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

	/* the device with this id has the most recent copy of the super */
	u64 latest_devid;
	u64 latest_trans;
	u64 num_devices;
	u64 open_devices;
	u64 rw_devices;
	u64 missing_devices;
	u64 total_rw_bytes;
	u64 num_can_discard;
	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;

	/* 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);

struct btrfs_bio {
	atomic_t stripes_pending;
	struct btrfs_fs_info *fs_info;
	bio_end_io_t *end_io;
	struct bio *orig_bio;
	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)

/*
 * 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 **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 void btrfs_dev_stat_inc(struct btrfs_device *dev,
				      int index)
{
	atomic_inc(dev->dev_stat_values + index);
	dev->dev_stats_dirty = 1;
}

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);
	dev->dev_stats_dirty = 1;
	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);
	dev->dev_stats_dirty = 1;
}

static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
					int index)
{
	btrfs_dev_stat_set(dev, index, 0);
}
#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;
0b86a832	39	struct btrfs_root *dev_root;
ffbd517d CM	40
	41	/* regular prio bios */
	42	struct btrfs_pending_bios pending_bios;
	43	/* WRITE_SYNC bios */
	44	struct btrfs_pending_bios pending_sync_bios;
	45
dfe25020	46	u64 generation;
3c45bfc1	47	int running_pending;
2b82032c	48	int writeable;
dfe25020	49	int in_fs_metadata;
cd02dca5	50	int missing;
d5e2003c	51	int can_discard;
63a212ab	52	int is_tgtdev_for_dev_replace;
b3075717	53
8790d502	54	spinlock_t io_lock;
3c45bfc1 DG	55	/* the mode sent to blkdev_get */
3c45bfc1 DG	56	fmode_t mode;
0b86a832 CM	57
	58	struct block_device *bdev;
	59
15916de8	60
606686ee	61	struct rcu_string *name;
8a4b83cc	62
0b86a832 CM	63	/* the internal btrfs device id */
	64	u64 devid;
	65
	66	/* size of the device */
	67	u64 total_bytes;
	68
d6397bae CB	69	/* size of the disk */
	70	u64 disk_total_bytes;
	71
0b86a832 CM	72	/* bytes used */
	73	u64 bytes_used;
	74
	75	/* optimal io alignment for this device */
	76	u32 io_align;
	77
	78	/* optimal io width for this device */
	79	u32 io_width;
3c45bfc1 DG	80	/* type and info about this device */
3c45bfc1 DG	81	u64 type;
0b86a832 CM	82
	83	/* minimal io size for this device */
	84	u32 sector_size;
	85
0b86a832	86
0b86a832	87	/* physical drive uuid (or lvm uuid) */
e17cade2	88	u8 uuid[BTRFS_UUID_SIZE];
8b712842	89
3c45bfc1 DG	90	/* for sending down flush barriers */
	91	int nobarriers;
	92	struct bio *flush_bio;
	93	struct completion flush_wait;
	94
a2de733c	95	/* per-device scrub information */
d9d181c1	96	struct scrub_ctx *scrub_device;
a2de733c	97
d458b054	98	struct btrfs_work work;
1f78160c XG	99	struct rcu_head rcu;
1f78160c XG	100	struct work_struct rcu_work;
90519d66 AJ	101
	102	/* readahead state */
	103	spinlock_t reada_lock;
	104	atomic_t reada_in_flight;
	105	u64 reada_next;
	106	struct reada_zone *reada_curr_zone;
	107	struct radix_tree_root reada_zones;
	108	struct radix_tree_root reada_extents;
387125fc	109
387125fc	110
442a4f63 SB	111	/* disk I/O failure stats. For detailed description refer to
442a4f63 SB	112	* enum btrfs_dev_stat_values in ioctl.h */
733f4fbb	113	int dev_stats_valid;
442a4f63 SB	114	int dev_stats_dirty; /* counters need to be written to disk */
442a4f63 SB	115	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
0b86a832 CM	116	};
0b86a832 CM	117
8a4b83cc CM	118	struct btrfs_fs_devices {
	119	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	120
d4a78947	121	/* the device with this id has the most recent copy of the super */
8a4b83cc CM	122	u64 latest_devid;
8a4b83cc CM	123	u64 latest_trans;
8a4b83cc	124	u64 num_devices;
a0af469b	125	u64 open_devices;
2b82032c	126	u64 rw_devices;
cd02dca5	127	u64 missing_devices;
2b82032c	128	u64 total_rw_bytes;
d5e2003c	129	u64 num_can_discard;
02db0844	130	u64 total_devices;
8a4b83cc	131	struct block_device *latest_bdev;
e5e9a520 CM	132
	133	/* all of the devices in the FS, protected by a mutex
	134	* so we can safely walk it to write out the supers without
9b011adf WS	135	* worrying about add/remove by the multi-device code.
	136	* Scrubbing super can kick off supers writing by holding
	137	* this mutex lock.
e5e9a520 CM	138	*/
e5e9a520 CM	139	struct mutex device_list_mutex;
8a4b83cc	140	struct list_head devices;
b3075717 CM	141
	142	/* devices not currently being allocated */
	143	struct list_head alloc_list;
8a4b83cc	144	struct list_head list;
2b82032c YZ	145
	146	struct btrfs_fs_devices *seed;
	147	int seeding;
2b82032c YZ	148
2b82032c YZ	149	int opened;
c289811c CM	150
	151	/* set when we find or add a device that doesn't have the
	152	* nonrot flag set
	153	*/
	154	int rotating;
8a4b83cc CM	155	};
8a4b83cc CM	156
facc8a22 MX	157	#define BTRFS_BIO_INLINE_CSUM_SIZE 64
facc8a22 MX	158
9be3395b CM	159	/*
	160	* we need the mirror number and stripe index to be passed around
	161	* the call chain while we are processing end_io (especially errors).
	162	* Really, what we need is a btrfs_bio structure that has this info
	163	* and is properly sized with its stripe array, but we're not there
	164	* quite yet. We have our own btrfs bioset, and all of the bios
	165	* we allocate are actually btrfs_io_bios. We'll cram as much of
	166	* struct btrfs_bio as we can into this over time.
	167	*/
facc8a22	168	typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
9be3395b CM	169	struct btrfs_io_bio {
	170	unsigned long mirror_num;
	171	unsigned long stripe_index;
facc8a22 MX	172	u8 *csum;
	173	u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
	174	u8 *csum_allocated;
	175	btrfs_io_bio_end_io_t *end_io;
9be3395b CM	176	struct bio bio;
	177	};
	178
	179	static inline struct btrfs_io_bio btrfs_io_bio(struct bio bio)
	180	{
	181	return container_of(bio, struct btrfs_io_bio, bio);
	182	}
	183
cea9e445 CM	184	struct btrfs_bio_stripe {
	185	struct btrfs_device *dev;
	186	u64 physical;
fce3bb9a	187	u64 length; /* only used for discard mappings */
cea9e445 CM	188	};
cea9e445 CM	189
a1d3c478 JS	190	struct btrfs_bio;
	191	typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
	192
	193	struct btrfs_bio {
cea9e445	194	atomic_t stripes_pending;
c404e0dc	195	struct btrfs_fs_info *fs_info;
cea9e445	196	bio_end_io_t *end_io;
7d2b4daa	197	struct bio *orig_bio;
cea9e445	198	void *private;
a236aed1 CM	199	atomic_t error;
a236aed1 CM	200	int max_errors;
cea9e445	201	int num_stripes;
a1d3c478	202	int mirror_num;
cea9e445 CM	203	struct btrfs_bio_stripe stripes[];
	204	};
	205
b2117a39 MX	206	struct btrfs_device_info {
	207	struct btrfs_device *dev;
	208	u64 dev_offset;
	209	u64 max_avail;
73c5de00	210	u64 total_avail;
b2117a39 MX	211	};
b2117a39 MX	212
31e50229 LB	213	struct btrfs_raid_attr {
	214	int sub_stripes; /* sub_stripes info for map */
	215	int dev_stripes; /* stripes per dev */
	216	int devs_max; /* max devs to use */
	217	int devs_min; /* min devs needed */
	218	int devs_increment; /* ndevs has to be a multiple of this */
	219	int ncopies; /* how many copies to data has */
	220	};
	221
1abe9b8a	222	struct map_lookup {
	223	u64 type;
	224	int io_align;
	225	int io_width;
	226	int stripe_len;
	227	int sector_size;
	228	int num_stripes;
	229	int sub_stripes;
	230	struct btrfs_bio_stripe stripes[];
	231	};
	232
a2de733c AJ	233	#define map_lookup_size(n) (sizeof(struct map_lookup) + \
	234	(sizeof(struct btrfs_bio_stripe) * (n)))
	235
f43ffb60 ID	236	/*
	237	* Restriper's general type filter
	238	*/
	239	#define BTRFS_BALANCE_DATA (1ULL << 0)
	240	#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
	241	#define BTRFS_BALANCE_METADATA (1ULL << 2)
	242
	243	#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA \| \
	244	BTRFS_BALANCE_SYSTEM \| \
	245	BTRFS_BALANCE_METADATA)
e4d8ec0f ID	246
e4d8ec0f ID	247	#define BTRFS_BALANCE_FORCE (1ULL << 3)
59641015	248	#define BTRFS_BALANCE_RESUME (1ULL << 4)
e4d8ec0f	249
ed25e9b2 ID	250	/*
	251	* Balance filters
	252	*/
	253	#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
5ce5b3c0	254	#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
409d404b	255	#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
94e60d5a	256	#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
ea67176a	257	#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
f43ffb60	258
cfa4c961 ID	259	/*
	260	* Profile changing flags. When SOFT is set we won't relocate chunk if
	261	* it already has the target profile (even though it may be
	262	* half-filled).
	263	*/
e4d8ec0f	264	#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
cfa4c961	265	#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
e4d8ec0f	266
c9e9f97b	267	struct btrfs_balance_args;
19a39dce	268	struct btrfs_balance_progress;
c9e9f97b ID	269	struct btrfs_balance_control {
	270	struct btrfs_fs_info *fs_info;
	271
	272	struct btrfs_balance_args data;
	273	struct btrfs_balance_args meta;
	274	struct btrfs_balance_args sys;
	275
	276	u64 flags;
19a39dce ID	277
19a39dce ID	278	struct btrfs_balance_progress stat;
c9e9f97b ID	279	};
c9e9f97b ID	280
6d07bcec MX	281	int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
	282	u64 end, u64 *length);
	283
a1d3c478	284	#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
cea9e445 CM	285	(sizeof(struct btrfs_bio_stripe) * (n)))
cea9e445 CM	286
3ec706c8	287	int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
cea9e445	288	u64 logical, u64 *length,
a1d3c478	289	struct btrfs_bio **bbio_ret, int mirror_num);
a512bbf8 YZ	290	int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
	291	u64 chunk_start, u64 physical, u64 devid,
	292	u64 *logical, int naddrs, int *stripe_len);
e4404d6e	293	int btrfs_read_sys_array(struct btrfs_root *root);
0b86a832 CM	294	int btrfs_read_chunk_tree(struct btrfs_root *root);
0b86a832 CM	295	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c	296	struct btrfs_root *extent_root, u64 type);
0b86a832 CM	297	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	298	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e	299	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
8b712842	300	int mirror_num, int async_submit);
8a4b83cc	301	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
97288f2c CH	302	fmode_t flags, void *holder);
97288f2c CH	303	int btrfs_scan_one_device(const char path, fmode_t flags, void holder,
8a4b83cc CM	304	struct btrfs_fs_devices **fs_devices_ret);
8a4b83cc CM	305	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
8dabb742 SB	306	void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
8dabb742 SB	307	struct btrfs_fs_devices *fs_devices, int step);
7ba15b7d SB	308	int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
	309	char *device_path,
	310	struct btrfs_device **device);
12bd2fc0 ID	311	struct btrfs_device btrfs_alloc_device(struct btrfs_fs_info fs_info,
	312	const u64 *devid,
	313	const u8 *uuid);
a061fc8d	314	int btrfs_rm_device(struct btrfs_root root, char device_path);
143bede5	315	void btrfs_cleanup_fs_uuids(void);
5d964051	316	int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
8f18cf13 CM	317	int btrfs_grow_device(struct btrfs_trans_handle *trans,
8f18cf13 CM	318	struct btrfs_device *device, u64 new_size);
aa1b8cd4	319	struct btrfs_device btrfs_find_device(struct btrfs_fs_info fs_info, u64 devid,
2b82032c	320	u8 uuid, u8 fsid);
8f18cf13	321	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb	322	int btrfs_init_new_device(struct btrfs_root root, char path);
e93c89c1 SB	323	int btrfs_init_dev_replace_tgtdev(struct btrfs_root root, char device_path,
e93c89c1 SB	324	struct btrfs_device **device_out);
c9e9f97b ID	325	int btrfs_balance(struct btrfs_balance_control *bctl,
c9e9f97b ID	326	struct btrfs_ioctl_balance_args *bargs);
2b6ba629	327	int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
68310a5e	328	int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
837d5b6e	329	int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
a7e99c69	330	int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
f7a81ea4	331	int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
70f80175	332	int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
2b82032c	333	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
6df9a95e JB	334	int find_free_dev_extent(struct btrfs_trans_handle *trans,
6df9a95e JB	335	struct btrfs_device *device, u64 num_bytes,
ba1bf481	336	u64 start, u64 max_avail);
442a4f63	337	void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
c11d2c23	338	int btrfs_get_dev_stats(struct btrfs_root *root,
b27f7c0c	339	struct btrfs_ioctl_get_dev_stats *stats);
cb517eab	340	void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
733f4fbb SB	341	int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
	342	int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
	343	struct btrfs_fs_info *fs_info);
e93c89c1 SB	344	void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
	345	struct btrfs_device *srcdev);
	346	void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
	347	struct btrfs_device *tgtdev);
	348	void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
	349	struct btrfs_device *tgtdev);
a8a6dab7	350	int btrfs_scratch_superblock(struct btrfs_device *device);
53b381b3 DW	351	int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
	352	u64 logical, u64 len, int mirror_num);
	353	unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
	354	struct btrfs_mapping_tree *map_tree,
	355	u64 logical);
6df9a95e JB	356	int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
	357	struct btrfs_root *extent_root,
	358	u64 chunk_offset, u64 chunk_size);
442a4f63 SB	359	static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
	360	int index)
	361	{
	362	atomic_inc(dev->dev_stat_values + index);
	363	dev->dev_stats_dirty = 1;
	364	}
	365
	366	static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
	367	int index)
	368	{
	369	return atomic_read(dev->dev_stat_values + index);
	370	}
	371
	372	static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
	373	int index)
	374	{
	375	int ret;
	376
	377	ret = atomic_xchg(dev->dev_stat_values + index, 0);
	378	dev->dev_stats_dirty = 1;
	379	return ret;
	380	}
	381
	382	static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
	383	int index, unsigned long val)
	384	{
	385	atomic_set(dev->dev_stat_values + index, val);
	386	dev->dev_stats_dirty = 1;
	387	}
	388
	389	static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
	390	int index)
	391	{
	392	btrfs_dev_stat_set(dev, index, 0);
	393	}
0b86a832	394	#endif