[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;
};

/*
 * Use sequence counter to get consistent device stat data on
 * 32-bit processors.
 */
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#include <linux/seqlock.h>
#define __BTRFS_NEED_DEVICE_DATA_ORDERED
#define btrfs_device_data_ordered_init(device)	\
	seqcount_init(&device->data_seqcount)
#else
#define btrfs_device_data_ordered_init(device) do { } while (0)
#endif

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;

#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
	seqcount_t data_seqcount;
#endif

	/* 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];
};

/*
 * If we read those variants at the context of their own lock, we needn't
 * use the following helpers, reading them directly is safe.
 */
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#define BTRFS_DEVICE_GETSET_FUNCS(name)					\
static inline u64							\
btrfs_device_get_##name(const struct btrfs_device *dev)			\
{									\
	u64 size;							\
	unsigned int seq;						\
									\
	do {								\
		seq = read_seqcount_begin(&dev->data_seqcount);		\
		size = dev->name;					\
	} while (read_seqcount_retry(&dev->data_seqcount, seq));	\
	return size;							\
}									\
									\
static inline void							\
btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
{									\
	preempt_disable();						\
	write_seqcount_begin(&dev->data_seqcount);			\
	dev->name = size;						\
	write_seqcount_end(&dev->data_seqcount);			\
	preempt_enable();						\
}
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
#define BTRFS_DEVICE_GETSET_FUNCS(name)					\
static inline u64							\
btrfs_device_get_##name(const struct btrfs_device *dev)			\
{									\
	u64 size;							\
									\
	preempt_disable();						\
	size = dev->name;						\
	preempt_enable();						\
	return size;							\
}									\
									\
static inline void							\
btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
{									\
	preempt_disable();						\
	dev->name = size;						\
	preempt_enable();						\
}
#else
#define BTRFS_DEVICE_GETSET_FUNCS(name)					\
static inline u64							\
btrfs_device_get_##name(const struct btrfs_device *dev)			\
{									\
	return dev->name;						\
}									\
									\
static inline void							\
btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
{									\
	dev->name = size;						\
}
#endif

BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
BTRFS_DEVICE_GETSET_FUNCS(bytes_used);

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
7cc8e58d MX	35	/*
	36	* Use sequence counter to get consistent device stat data on
	37	* 32-bit processors.
	38	*/
	39	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	40	#include <linux/seqlock.h>
	41	#define __BTRFS_NEED_DEVICE_DATA_ORDERED
	42	#define btrfs_device_data_ordered_init(device) \
	43	seqcount_init(&device->data_seqcount)
	44	#else
	45	#define btrfs_device_data_ordered_init(device) do { } while (0)
	46	#endif
	47
0b86a832 CM	48	struct btrfs_device {
0b86a832 CM	49	struct list_head dev_list;
b3075717	50	struct list_head dev_alloc_list;
2b82032c	51	struct btrfs_fs_devices *fs_devices;
d5ee37bc	52
0b86a832	53	struct btrfs_root *dev_root;
ffbd517d	54
d5ee37bc MX	55	struct rcu_string *name;
	56
	57	u64 generation;
	58
	59	spinlock_t io_lock ____cacheline_aligned;
	60	int running_pending;
ffbd517d CM	61	/* regular prio bios */
	62	struct btrfs_pending_bios pending_bios;
	63	/* WRITE_SYNC bios */
	64	struct btrfs_pending_bios pending_sync_bios;
	65
d5ee37bc MX	66	struct block_device *bdev;
	67
	68	/* the mode sent to blkdev_get */
	69	fmode_t mode;
	70
2b82032c	71	int writeable;
dfe25020	72	int in_fs_metadata;
cd02dca5	73	int missing;
d5e2003c	74	int can_discard;
63a212ab	75	int is_tgtdev_for_dev_replace;
b3075717	76
7cc8e58d MX	77	#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
	78	seqcount_t data_seqcount;
	79	#endif
	80
0b86a832 CM	81	/* the internal btrfs device id */
	82	u64 devid;
	83
6ba40b61	84	/* size of the device in memory */
0b86a832 CM	85	u64 total_bytes;
0b86a832 CM	86
6ba40b61	87	/* size of the device on disk */
d6397bae CB	88	u64 disk_total_bytes;
d6397bae CB	89
0b86a832 CM	90	/* bytes used */
	91	u64 bytes_used;
	92
	93	/* optimal io alignment for this device */
	94	u32 io_align;
	95
	96	/* optimal io width for this device */
	97	u32 io_width;
3c45bfc1 DG	98	/* type and info about this device */
3c45bfc1 DG	99	u64 type;
0b86a832 CM	100
	101	/* minimal io size for this device */
	102	u32 sector_size;
	103
0b86a832	104	/* physical drive uuid (or lvm uuid) */
e17cade2	105	u8 uuid[BTRFS_UUID_SIZE];
8b712842	106
935e5cc9 MX	107	/*
	108	* size of the device on the current transaction
	109	*
	110	* This variant is update when committing the transaction,
	111	* and protected by device_list_mutex
	112	*/
	113	u64 commit_total_bytes;
	114
ce7213c7 MX	115	/* bytes used on the current transaction */
ce7213c7 MX	116	u64 commit_bytes_used;
935e5cc9 MX	117	/*
	118	* used to manage the device which is resized
	119	*
	120	* It is protected by chunk_lock.
	121	*/
	122	struct list_head resized_list;
	123
3c45bfc1 DG	124	/* for sending down flush barriers */
	125	int nobarriers;
	126	struct bio *flush_bio;
	127	struct completion flush_wait;
	128
a2de733c	129	/* per-device scrub information */
d9d181c1	130	struct scrub_ctx *scrub_device;
a2de733c	131
d458b054	132	struct btrfs_work work;
1f78160c XG	133	struct rcu_head rcu;
1f78160c XG	134	struct work_struct rcu_work;
90519d66 AJ	135
	136	/* readahead state */
	137	spinlock_t reada_lock;
	138	atomic_t reada_in_flight;
	139	u64 reada_next;
	140	struct reada_zone *reada_curr_zone;
	141	struct radix_tree_root reada_zones;
	142	struct radix_tree_root reada_extents;
387125fc	143
442a4f63 SB	144	/* disk I/O failure stats. For detailed description refer to
442a4f63 SB	145	* enum btrfs_dev_stat_values in ioctl.h */
733f4fbb	146	int dev_stats_valid;
addc3fa7 MX	147
	148	/* Counter to record the change of device stats */
	149	atomic_t dev_stats_ccnt;
442a4f63	150	atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
0b86a832 CM	151	};
0b86a832 CM	152
7cc8e58d MX	153	/*
	154	* If we read those variants at the context of their own lock, we needn't
	155	* use the following helpers, reading them directly is safe.
	156	*/
	157	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	158	#define BTRFS_DEVICE_GETSET_FUNCS(name) \
	159	static inline u64 \
	160	btrfs_device_get_##name(const struct btrfs_device *dev) \
	161	{ \
	162	u64 size; \
	163	unsigned int seq; \
	164	\
	165	do { \
	166	seq = read_seqcount_begin(&dev->data_seqcount); \
	167	size = dev->name; \
	168	} while (read_seqcount_retry(&dev->data_seqcount, seq)); \
	169	return size; \
	170	} \
	171	\
	172	static inline void \
	173	btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
	174	{ \
	175	preempt_disable(); \
	176	write_seqcount_begin(&dev->data_seqcount); \
	177	dev->name = size; \
	178	write_seqcount_end(&dev->data_seqcount); \
	179	preempt_enable(); \
	180	}
	181	#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	182	#define BTRFS_DEVICE_GETSET_FUNCS(name) \
	183	static inline u64 \
	184	btrfs_device_get_##name(const struct btrfs_device *dev) \
	185	{ \
	186	u64 size; \
	187	\
	188	preempt_disable(); \
	189	size = dev->name; \
	190	preempt_enable(); \
	191	return size; \
	192	} \
	193	\
	194	static inline void \
	195	btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
	196	{ \
	197	preempt_disable(); \
	198	dev->name = size; \
	199	preempt_enable(); \
	200	}
	201	#else
	202	#define BTRFS_DEVICE_GETSET_FUNCS(name) \
	203	static inline u64 \
	204	btrfs_device_get_##name(const struct btrfs_device *dev) \
	205	{ \
	206	return dev->name; \
	207	} \
	208	\
	209	static inline void \
	210	btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
	211	{ \
	212	dev->name = size; \
	213	}
	214	#endif
	215
	216	BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
217	BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
218	BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
219
8a4b83cc CM	220	struct btrfs_fs_devices {
	221	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	222
8a4b83cc	223	u64 num_devices;
a0af469b	224	u64 open_devices;
2b82032c	225	u64 rw_devices;
cd02dca5	226	u64 missing_devices;
2b82032c	227	u64 total_rw_bytes;
02db0844	228	u64 total_devices;
8a4b83cc	229	struct block_device *latest_bdev;
e5e9a520 CM	230
	231	/* all of the devices in the FS, protected by a mutex
	232	* so we can safely walk it to write out the supers without
9b011adf WS	233	* worrying about add/remove by the multi-device code.
	234	* Scrubbing super can kick off supers writing by holding
	235	* this mutex lock.
e5e9a520 CM	236	*/
e5e9a520 CM	237	struct mutex device_list_mutex;
8a4b83cc	238	struct list_head devices;
b3075717	239
935e5cc9	240	struct list_head resized_devices;
b3075717 CM	241	/* devices not currently being allocated */
b3075717 CM	242	struct list_head alloc_list;
8a4b83cc	243	struct list_head list;
2b82032c YZ	244
	245	struct btrfs_fs_devices *seed;
	246	int seeding;
2b82032c YZ	247
2b82032c YZ	248	int opened;
c289811c CM	249
	250	/* set when we find or add a device that doesn't have the
	251	* nonrot flag set
	252	*/
	253	int rotating;
8a4b83cc CM	254	};
8a4b83cc CM	255
facc8a22 MX	256	#define BTRFS_BIO_INLINE_CSUM_SIZE 64
facc8a22 MX	257
9be3395b CM	258	/*
	259	* we need the mirror number and stripe index to be passed around
	260	* the call chain while we are processing end_io (especially errors).
	261	* Really, what we need is a btrfs_bio structure that has this info
	262	* and is properly sized with its stripe array, but we're not there
	263	* quite yet. We have our own btrfs bioset, and all of the bios
	264	* we allocate are actually btrfs_io_bios. We'll cram as much of
	265	* struct btrfs_bio as we can into this over time.
	266	*/
facc8a22	267	typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
9be3395b CM	268	struct btrfs_io_bio {
	269	unsigned long mirror_num;
	270	unsigned long stripe_index;
facc8a22 MX	271	u8 *csum;
	272	u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
	273	u8 *csum_allocated;
	274	btrfs_io_bio_end_io_t *end_io;
9be3395b CM	275	struct bio bio;
	276	};
	277
	278	static inline struct btrfs_io_bio btrfs_io_bio(struct bio bio)
	279	{
	280	return container_of(bio, struct btrfs_io_bio, bio);
	281	}
	282
cea9e445 CM	283	struct btrfs_bio_stripe {
	284	struct btrfs_device *dev;
	285	u64 physical;
fce3bb9a	286	u64 length; /* only used for discard mappings */
cea9e445 CM	287	};
cea9e445 CM	288
a1d3c478 JS	289	struct btrfs_bio;
	290	typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
	291
c55f1396 MX	292	#define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
c55f1396 MX	293
a1d3c478	294	struct btrfs_bio {
cea9e445	295	atomic_t stripes_pending;
c404e0dc	296	struct btrfs_fs_info *fs_info;
cea9e445	297	bio_end_io_t *end_io;
7d2b4daa	298	struct bio *orig_bio;
c55f1396	299	unsigned long flags;
cea9e445	300	void *private;
a236aed1 CM	301	atomic_t error;
a236aed1 CM	302	int max_errors;
cea9e445	303	int num_stripes;
a1d3c478	304	int mirror_num;
cea9e445 CM	305	struct btrfs_bio_stripe stripes[];
	306	};
	307
b2117a39 MX	308	struct btrfs_device_info {
	309	struct btrfs_device *dev;
	310	u64 dev_offset;
	311	u64 max_avail;
73c5de00	312	u64 total_avail;
b2117a39 MX	313	};
b2117a39 MX	314
31e50229 LB	315	struct btrfs_raid_attr {
	316	int sub_stripes; /* sub_stripes info for map */
	317	int dev_stripes; /* stripes per dev */
	318	int devs_max; /* max devs to use */
	319	int devs_min; /* min devs needed */
	320	int devs_increment; /* ndevs has to be a multiple of this */
	321	int ncopies; /* how many copies to data has */
	322	};
	323
1abe9b8a	324	struct map_lookup {
	325	u64 type;
	326	int io_align;
	327	int io_width;
	328	int stripe_len;
	329	int sector_size;
	330	int num_stripes;
	331	int sub_stripes;
	332	struct btrfs_bio_stripe stripes[];
	333	};
	334
a2de733c AJ	335	#define map_lookup_size(n) (sizeof(struct map_lookup) + \
	336	(sizeof(struct btrfs_bio_stripe) * (n)))
	337
f43ffb60 ID	338	/*
	339	* Restriper's general type filter
	340	*/
	341	#define BTRFS_BALANCE_DATA (1ULL << 0)
	342	#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
	343	#define BTRFS_BALANCE_METADATA (1ULL << 2)
	344
	345	#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA \| \
	346	BTRFS_BALANCE_SYSTEM \| \
	347	BTRFS_BALANCE_METADATA)
e4d8ec0f ID	348
e4d8ec0f ID	349	#define BTRFS_BALANCE_FORCE (1ULL << 3)
59641015	350	#define BTRFS_BALANCE_RESUME (1ULL << 4)
e4d8ec0f	351
ed25e9b2 ID	352	/*
	353	* Balance filters
	354	*/
	355	#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
5ce5b3c0	356	#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
409d404b	357	#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
94e60d5a	358	#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
ea67176a	359	#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
7d824b6f	360	#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
f43ffb60	361
cfa4c961 ID	362	/*
	363	* Profile changing flags. When SOFT is set we won't relocate chunk if
	364	* it already has the target profile (even though it may be
	365	* half-filled).
	366	*/
e4d8ec0f	367	#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
cfa4c961	368	#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
e4d8ec0f	369
c9e9f97b	370	struct btrfs_balance_args;
19a39dce	371	struct btrfs_balance_progress;
c9e9f97b ID	372	struct btrfs_balance_control {
	373	struct btrfs_fs_info *fs_info;
	374
	375	struct btrfs_balance_args data;
	376	struct btrfs_balance_args meta;
	377	struct btrfs_balance_args sys;
	378
	379	u64 flags;
19a39dce ID	380
19a39dce ID	381	struct btrfs_balance_progress stat;
c9e9f97b ID	382	};
c9e9f97b ID	383
6d07bcec MX	384	int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
	385	u64 end, u64 *length);
	386
a1d3c478	387	#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
cea9e445 CM	388	(sizeof(struct btrfs_bio_stripe) * (n)))
cea9e445 CM	389
3ec706c8	390	int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
cea9e445	391	u64 logical, u64 *length,
a1d3c478	392	struct btrfs_bio **bbio_ret, int mirror_num);
a512bbf8 YZ	393	int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
	394	u64 chunk_start, u64 physical, u64 devid,
	395	u64 *logical, int naddrs, int *stripe_len);
e4404d6e	396	int btrfs_read_sys_array(struct btrfs_root *root);
0b86a832 CM	397	int btrfs_read_chunk_tree(struct btrfs_root *root);
0b86a832 CM	398	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c	399	struct btrfs_root *extent_root, u64 type);
0b86a832 CM	400	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	401	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e	402	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
8b712842	403	int mirror_num, int async_submit);
8a4b83cc	404	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
97288f2c CH	405	fmode_t flags, void *holder);
97288f2c CH	406	int btrfs_scan_one_device(const char path, fmode_t flags, void holder,
8a4b83cc CM	407	struct btrfs_fs_devices **fs_devices_ret);
8a4b83cc CM	408	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
8dabb742 SB	409	void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
8dabb742 SB	410	struct btrfs_fs_devices *fs_devices, int step);
7ba15b7d SB	411	int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
	412	char *device_path,
	413	struct btrfs_device **device);
12bd2fc0 ID	414	struct btrfs_device btrfs_alloc_device(struct btrfs_fs_info fs_info,
	415	const u64 *devid,
	416	const u8 *uuid);
a061fc8d	417	int btrfs_rm_device(struct btrfs_root root, char device_path);
143bede5	418	void btrfs_cleanup_fs_uuids(void);
5d964051	419	int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
8f18cf13 CM	420	int btrfs_grow_device(struct btrfs_trans_handle *trans,
8f18cf13 CM	421	struct btrfs_device *device, u64 new_size);
aa1b8cd4	422	struct btrfs_device btrfs_find_device(struct btrfs_fs_info fs_info, u64 devid,
2b82032c	423	u8 uuid, u8 fsid);
8f18cf13	424	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb	425	int btrfs_init_new_device(struct btrfs_root root, char path);
e93c89c1	426	int btrfs_init_dev_replace_tgtdev(struct btrfs_root root, char device_path,
1c43366d	427	struct btrfs_device *srcdev,
e93c89c1	428	struct btrfs_device **device_out);
c9e9f97b ID	429	int btrfs_balance(struct btrfs_balance_control *bctl,
c9e9f97b ID	430	struct btrfs_ioctl_balance_args *bargs);
2b6ba629	431	int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
68310a5e	432	int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
837d5b6e	433	int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
a7e99c69	434	int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
f7a81ea4	435	int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
70f80175	436	int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
2b82032c	437	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
6df9a95e JB	438	int find_free_dev_extent(struct btrfs_trans_handle *trans,
6df9a95e JB	439	struct btrfs_device *device, u64 num_bytes,
ba1bf481	440	u64 start, u64 max_avail);
442a4f63	441	void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
c11d2c23	442	int btrfs_get_dev_stats(struct btrfs_root *root,
b27f7c0c	443	struct btrfs_ioctl_get_dev_stats *stats);
cb517eab	444	void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
733f4fbb SB	445	int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
	446	int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
	447	struct btrfs_fs_info *fs_info);
e93c89c1 SB	448	void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
	449	struct btrfs_device *srcdev);
	450	void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
	451	struct btrfs_device *tgtdev);
	452	void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
	453	struct btrfs_device *tgtdev);
a8a6dab7	454	int btrfs_scratch_superblock(struct btrfs_device *device);
53b381b3 DW	455	int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
	456	u64 logical, u64 len, int mirror_num);
	457	unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
	458	struct btrfs_mapping_tree *map_tree,
	459	u64 logical);
6df9a95e JB	460	int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
	461	struct btrfs_root *extent_root,
	462	u64 chunk_offset, u64 chunk_size);
addc3fa7 MX	463
	464	static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
	465	{
	466	return atomic_read(&dev->dev_stats_ccnt);
	467	}
	468
442a4f63 SB	469	static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
	470	int index)
	471	{
	472	atomic_inc(dev->dev_stat_values + index);
addc3fa7 MX	473	smp_mb__before_atomic();
addc3fa7 MX	474	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	475	}
	476
	477	static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
	478	int index)
	479	{
	480	return atomic_read(dev->dev_stat_values + index);
	481	}
	482
	483	static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
	484	int index)
	485	{
	486	int ret;
	487
	488	ret = atomic_xchg(dev->dev_stat_values + index, 0);
addc3fa7 MX	489	smp_mb__before_atomic();
addc3fa7 MX	490	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	491	return ret;
	492	}
	493
	494	static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
	495	int index, unsigned long val)
	496	{
	497	atomic_set(dev->dev_stat_values + index, val);
addc3fa7 MX	498	smp_mb__before_atomic();
addc3fa7 MX	499	atomic_inc(&dev->dev_stats_ccnt);
442a4f63 SB	500	}
	501
	502	static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
	503	int index)
	504	{
	505	btrfs_dev_stat_set(dev, index, 0);
	506	}
935e5cc9 MX	507
935e5cc9 MX	508	void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
ce7213c7 MX	509	void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
ce7213c7 MX	510	struct btrfs_transaction *transaction);
0b86a832	511	#endif