[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 "async-thread.h"
#include "ioctl.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;

	int running_pending;
	u64 generation;

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

	spinlock_t io_lock;

	struct block_device *bdev;

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

	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;

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

	/* type and info about this device */
	u64 type;

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

	/* 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;

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

	/* 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
	 */
	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;
};

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;
	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_alloc_dev_extent(struct btrfs_trans_handle *trans,
			   struct btrfs_device *device,
			   u64 chunk_tree, u64 chunk_objectid,
			   u64 chunk_offset, u64 start, u64 num_bytes);
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);
int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
			      struct btrfs_device **device);
int btrfs_add_device(struct btrfs_trans_handle *trans,
		     struct btrfs_root *root,
		     struct btrfs_device *device);
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_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
			 u64 *start, u64 *max_avail);
void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
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);
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);

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>
8b712842	24	#include "async-thread.h"
442a4f63	25	#include "ioctl.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
8b712842	46	int running_pending;
dfe25020	47	u64 generation;
b3075717	48
2b82032c	49	int writeable;
dfe25020	50	int in_fs_metadata;
cd02dca5	51	int missing;
d5e2003c	52	int can_discard;
63a212ab	53	int is_tgtdev_for_dev_replace;
b3075717	54
8790d502	55	spinlock_t io_lock;
0b86a832 CM	56
	57	struct block_device *bdev;
	58
d4d77629	59	/* the mode sent to blkdev_get */
15916de8 CM	60	fmode_t mode;
15916de8 CM	61
606686ee	62	struct rcu_string *name;
8a4b83cc	63
0b86a832 CM	64	/* the internal btrfs device id */
	65	u64 devid;
	66
	67	/* size of the device */
	68	u64 total_bytes;
	69
d6397bae CB	70	/* size of the disk */
	71	u64 disk_total_bytes;
	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;
	81
	82	/* minimal io size for this device */
	83	u32 sector_size;
	84
0b86a832 CM	85	/* type and info about this device */
	86	u64 type;
	87
0b86a832	88	/* physical drive uuid (or lvm uuid) */
e17cade2	89	u8 uuid[BTRFS_UUID_SIZE];
8b712842	90
a2de733c	91	/* per-device scrub information */
d9d181c1	92	struct scrub_ctx *scrub_device;
a2de733c	93
8b712842	94	struct btrfs_work work;
1f78160c XG	95	struct rcu_head rcu;
1f78160c XG	96	struct work_struct rcu_work;
90519d66 AJ	97
	98	/* readahead state */
	99	spinlock_t reada_lock;
	100	atomic_t reada_in_flight;
	101	u64 reada_next;
	102	struct reada_zone *reada_curr_zone;
	103	struct radix_tree_root reada_zones;
	104	struct radix_tree_root reada_extents;
387125fc CM	105
	106	/* for sending down flush barriers */
	107	struct bio *flush_bio;
	108	struct completion flush_wait;
	109	int nobarriers;
	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
	135	* worrying about add/remove by the multi-device code
	136	*/
	137	struct mutex device_list_mutex;
8a4b83cc	138	struct list_head devices;
b3075717 CM	139
	140	/* devices not currently being allocated */
	141	struct list_head alloc_list;
8a4b83cc	142	struct list_head list;
2b82032c YZ	143
	144	struct btrfs_fs_devices *seed;
	145	int seeding;
2b82032c YZ	146
2b82032c YZ	147	int opened;
c289811c CM	148
	149	/* set when we find or add a device that doesn't have the
	150	* nonrot flag set
	151	*/
	152	int rotating;
8a4b83cc CM	153	};
8a4b83cc CM	154
cea9e445 CM	155	struct btrfs_bio_stripe {
	156	struct btrfs_device *dev;
	157	u64 physical;
fce3bb9a	158	u64 length; /* only used for discard mappings */
cea9e445 CM	159	};
cea9e445 CM	160
a1d3c478 JS	161	struct btrfs_bio;
	162	typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
	163
	164	struct btrfs_bio {
cea9e445 CM	165	atomic_t stripes_pending;
cea9e445 CM	166	bio_end_io_t *end_io;
7d2b4daa	167	struct bio *orig_bio;
cea9e445	168	void *private;
a236aed1 CM	169	atomic_t error;
a236aed1 CM	170	int max_errors;
cea9e445	171	int num_stripes;
a1d3c478	172	int mirror_num;
cea9e445 CM	173	struct btrfs_bio_stripe stripes[];
	174	};
	175
b2117a39 MX	176	struct btrfs_device_info {
	177	struct btrfs_device *dev;
	178	u64 dev_offset;
	179	u64 max_avail;
73c5de00	180	u64 total_avail;
b2117a39 MX	181	};
b2117a39 MX	182
31e50229 LB	183	struct btrfs_raid_attr {
	184	int sub_stripes; /* sub_stripes info for map */
	185	int dev_stripes; /* stripes per dev */
	186	int devs_max; /* max devs to use */
	187	int devs_min; /* min devs needed */
	188	int devs_increment; /* ndevs has to be a multiple of this */
	189	int ncopies; /* how many copies to data has */
	190	};
	191
1abe9b8a	192	struct map_lookup {
	193	u64 type;
	194	int io_align;
	195	int io_width;
	196	int stripe_len;
	197	int sector_size;
	198	int num_stripes;
	199	int sub_stripes;
	200	struct btrfs_bio_stripe stripes[];
	201	};
	202
a2de733c AJ	203	#define map_lookup_size(n) (sizeof(struct map_lookup) + \
	204	(sizeof(struct btrfs_bio_stripe) * (n)))
	205
f43ffb60 ID	206	/*
	207	* Restriper's general type filter
	208	*/
	209	#define BTRFS_BALANCE_DATA (1ULL << 0)
	210	#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
	211	#define BTRFS_BALANCE_METADATA (1ULL << 2)
	212
	213	#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA \| \
	214	BTRFS_BALANCE_SYSTEM \| \
	215	BTRFS_BALANCE_METADATA)
e4d8ec0f ID	216
e4d8ec0f ID	217	#define BTRFS_BALANCE_FORCE (1ULL << 3)
59641015	218	#define BTRFS_BALANCE_RESUME (1ULL << 4)
e4d8ec0f	219
ed25e9b2 ID	220	/*
	221	* Balance filters
	222	*/
	223	#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
5ce5b3c0	224	#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
409d404b	225	#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
94e60d5a	226	#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
ea67176a	227	#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
f43ffb60	228
cfa4c961 ID	229	/*
	230	* Profile changing flags. When SOFT is set we won't relocate chunk if
	231	* it already has the target profile (even though it may be
	232	* half-filled).
	233	*/
e4d8ec0f	234	#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
cfa4c961	235	#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
e4d8ec0f	236
c9e9f97b	237	struct btrfs_balance_args;
19a39dce	238	struct btrfs_balance_progress;
c9e9f97b ID	239	struct btrfs_balance_control {
	240	struct btrfs_fs_info *fs_info;
	241
	242	struct btrfs_balance_args data;
	243	struct btrfs_balance_args meta;
	244	struct btrfs_balance_args sys;
	245
	246	u64 flags;
19a39dce ID	247
19a39dce ID	248	struct btrfs_balance_progress stat;
c9e9f97b ID	249	};
c9e9f97b ID	250
6d07bcec MX	251	int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
	252	u64 end, u64 *length);
	253
a1d3c478	254	#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
cea9e445 CM	255	(sizeof(struct btrfs_bio_stripe) * (n)))
cea9e445 CM	256
0b86a832 CM	257	int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
0b86a832 CM	258	struct btrfs_device *device,
e17cade2	259	u64 chunk_tree, u64 chunk_objectid,
2b82032c	260	u64 chunk_offset, u64 start, u64 num_bytes);
3ec706c8	261	int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
cea9e445	262	u64 logical, u64 *length,
a1d3c478	263	struct btrfs_bio **bbio_ret, int mirror_num);
a512bbf8 YZ	264	int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
	265	u64 chunk_start, u64 physical, u64 devid,
	266	u64 *logical, int naddrs, int *stripe_len);
e4404d6e	267	int btrfs_read_sys_array(struct btrfs_root *root);
0b86a832 CM	268	int btrfs_read_chunk_tree(struct btrfs_root *root);
0b86a832 CM	269	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c	270	struct btrfs_root *extent_root, u64 type);
0b86a832 CM	271	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	272	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e	273	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
8b712842	274	int mirror_num, int async_submit);
8a4b83cc	275	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
97288f2c CH	276	fmode_t flags, void *holder);
97288f2c CH	277	int btrfs_scan_one_device(const char path, fmode_t flags, void holder,
8a4b83cc CM	278	struct btrfs_fs_devices **fs_devices_ret);
8a4b83cc CM	279	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
8dabb742 SB	280	void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
8dabb742 SB	281	struct btrfs_fs_devices *fs_devices, int step);
7ba15b7d SB	282	int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
	283	char *device_path,
	284	struct btrfs_device **device);
	285	int btrfs_find_device_by_path(struct btrfs_root root, char device_path,
	286	struct btrfs_device **device);
8a4b83cc CM	287	int btrfs_add_device(struct btrfs_trans_handle *trans,
	288	struct btrfs_root *root,
	289	struct btrfs_device *device);
a061fc8d	290	int btrfs_rm_device(struct btrfs_root root, char device_path);
143bede5	291	void btrfs_cleanup_fs_uuids(void);
5d964051	292	int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
8f18cf13 CM	293	int btrfs_grow_device(struct btrfs_trans_handle *trans,
8f18cf13 CM	294	struct btrfs_device *device, u64 new_size);
aa1b8cd4	295	struct btrfs_device btrfs_find_device(struct btrfs_fs_info fs_info, u64 devid,
2b82032c	296	u8 uuid, u8 fsid);
8f18cf13	297	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb	298	int btrfs_init_new_device(struct btrfs_root root, char path);
e93c89c1 SB	299	int btrfs_init_dev_replace_tgtdev(struct btrfs_root root, char device_path,
e93c89c1 SB	300	struct btrfs_device **device_out);
c9e9f97b ID	301	int btrfs_balance(struct btrfs_balance_control *bctl,
c9e9f97b ID	302	struct btrfs_ioctl_balance_args *bargs);
2b6ba629	303	int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
68310a5e	304	int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
837d5b6e	305	int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
a7e99c69	306	int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
2b82032c	307	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
125ccb0a	308	int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
ba1bf481	309	u64 start, u64 max_avail);
442a4f63 SB	310	void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
442a4f63 SB	311	void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
c11d2c23	312	int btrfs_get_dev_stats(struct btrfs_root *root,
b27f7c0c	313	struct btrfs_ioctl_get_dev_stats *stats);
733f4fbb SB	314	int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
	315	int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
	316	struct btrfs_fs_info *fs_info);
e93c89c1 SB	317	void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
	318	struct btrfs_device *srcdev);
	319	void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
	320	struct btrfs_device *tgtdev);
	321	void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
	322	struct btrfs_device *tgtdev);
a8a6dab7	323	int btrfs_scratch_superblock(struct btrfs_device *device);
442a4f63 SB	324
	325	static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
	326	int index)
	327	{
	328	atomic_inc(dev->dev_stat_values + index);
	329	dev->dev_stats_dirty = 1;
	330	}
	331
	332	static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
	333	int index)
	334	{
	335	return atomic_read(dev->dev_stat_values + index);
	336	}
	337
	338	static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
	339	int index)
	340	{
	341	int ret;
	342
	343	ret = atomic_xchg(dev->dev_stat_values + index, 0);
	344	dev->dev_stats_dirty = 1;
	345	return ret;
	346	}
	347
	348	static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
	349	int index, unsigned long val)
	350	{
	351	atomic_set(dev->dev_stat_values + index, val);
	352	dev->dev_stats_dirty = 1;
	353	}
	354
	355	static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
	356	int index)
	357	{
	358	btrfs_dev_stat_set(dev, index, 0);
	359	}
0b86a832	360	#endif