[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"

#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;

	spinlock_t io_lock;

	struct block_device *bdev;

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

	char *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_dev *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;

};

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;
	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 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)

struct btrfs_balance_args;
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;
};

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_mapping_tree *map_tree, 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);
int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
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);
int btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, 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_root *root, 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_balance(struct btrfs_balance_control *bctl,
		  struct btrfs_ioctl_balance_args *bargs);
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);
#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"
cea9e445	25
b2117a39 MX	26	#define BTRFS_STRIPE_LEN (64 * 1024)
b2117a39 MX	27
f2984462	28	struct buffer_head;
ffbd517d CM	29	struct btrfs_pending_bios {
	30	struct bio *head;
	31	struct bio *tail;
	32	};
	33
0b86a832 CM	34	struct btrfs_device {
0b86a832 CM	35	struct list_head dev_list;
b3075717	36	struct list_head dev_alloc_list;
2b82032c	37	struct btrfs_fs_devices *fs_devices;
0b86a832	38	struct btrfs_root *dev_root;
ffbd517d CM	39
	40	/* regular prio bios */
	41	struct btrfs_pending_bios pending_bios;
	42	/* WRITE_SYNC bios */
	43	struct btrfs_pending_bios pending_sync_bios;
	44
8b712842	45	int running_pending;
dfe25020	46	u64 generation;
b3075717	47
2b82032c	48	int writeable;
dfe25020	49	int in_fs_metadata;
cd02dca5	50	int missing;
d5e2003c	51	int can_discard;
b3075717	52
8790d502	53	spinlock_t io_lock;
0b86a832 CM	54
	55	struct block_device *bdev;
	56
d4d77629	57	/* the mode sent to blkdev_get */
15916de8 CM	58	fmode_t mode;
15916de8 CM	59
8a4b83cc CM	60	char *name;
8a4b83cc CM	61
0b86a832 CM	62	/* the internal btrfs device id */
	63	u64 devid;
	64
	65	/* size of the device */
	66	u64 total_bytes;
	67
d6397bae CB	68	/* size of the disk */
	69	u64 disk_total_bytes;
	70
0b86a832 CM	71	/* bytes used */
	72	u64 bytes_used;
	73
	74	/* optimal io alignment for this device */
	75	u32 io_align;
	76
	77	/* optimal io width for this device */
	78	u32 io_width;
	79
	80	/* minimal io size for this device */
	81	u32 sector_size;
	82
0b86a832 CM	83	/* type and info about this device */
	84	u64 type;
	85
0b86a832	86	/* physical drive uuid (or lvm uuid) */
e17cade2	87	u8 uuid[BTRFS_UUID_SIZE];
8b712842	88
a2de733c AJ	89	/* per-device scrub information */
	90	struct scrub_dev *scrub_device;
	91
8b712842	92	struct btrfs_work work;
1f78160c XG	93	struct rcu_head rcu;
1f78160c XG	94	struct work_struct rcu_work;
90519d66 AJ	95
	96	/* readahead state */
	97	spinlock_t reada_lock;
	98	atomic_t reada_in_flight;
	99	u64 reada_next;
	100	struct reada_zone *reada_curr_zone;
	101	struct radix_tree_root reada_zones;
	102	struct radix_tree_root reada_extents;
387125fc CM	103
	104	/* for sending down flush barriers */
	105	struct bio *flush_bio;
	106	struct completion flush_wait;
	107	int nobarriers;
	108
0b86a832 CM	109	};
0b86a832 CM	110
8a4b83cc CM	111	struct btrfs_fs_devices {
	112	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	113
d4a78947	114	/* the device with this id has the most recent copy of the super */
8a4b83cc CM	115	u64 latest_devid;
8a4b83cc CM	116	u64 latest_trans;
8a4b83cc	117	u64 num_devices;
a0af469b	118	u64 open_devices;
2b82032c	119	u64 rw_devices;
cd02dca5	120	u64 missing_devices;
2b82032c	121	u64 total_rw_bytes;
d5e2003c	122	u64 num_can_discard;
8a4b83cc	123	struct block_device *latest_bdev;
e5e9a520 CM	124
	125	/* all of the devices in the FS, protected by a mutex
	126	* so we can safely walk it to write out the supers without
	127	* worrying about add/remove by the multi-device code
	128	*/
	129	struct mutex device_list_mutex;
8a4b83cc	130	struct list_head devices;
b3075717 CM	131
	132	/* devices not currently being allocated */
	133	struct list_head alloc_list;
8a4b83cc	134	struct list_head list;
2b82032c YZ	135
	136	struct btrfs_fs_devices *seed;
	137	int seeding;
2b82032c YZ	138
2b82032c YZ	139	int opened;
c289811c CM	140
	141	/* set when we find or add a device that doesn't have the
	142	* nonrot flag set
	143	*/
	144	int rotating;
8a4b83cc CM	145	};
8a4b83cc CM	146
cea9e445 CM	147	struct btrfs_bio_stripe {
	148	struct btrfs_device *dev;
	149	u64 physical;
fce3bb9a	150	u64 length; /* only used for discard mappings */
cea9e445 CM	151	};
cea9e445 CM	152
a1d3c478 JS	153	struct btrfs_bio;
	154	typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
	155
	156	struct btrfs_bio {
cea9e445 CM	157	atomic_t stripes_pending;
cea9e445 CM	158	bio_end_io_t *end_io;
7d2b4daa	159	struct bio *orig_bio;
cea9e445	160	void *private;
a236aed1 CM	161	atomic_t error;
a236aed1 CM	162	int max_errors;
cea9e445	163	int num_stripes;
a1d3c478	164	int mirror_num;
cea9e445 CM	165	struct btrfs_bio_stripe stripes[];
	166	};
	167
b2117a39 MX	168	struct btrfs_device_info {
	169	struct btrfs_device *dev;
	170	u64 dev_offset;
	171	u64 max_avail;
73c5de00	172	u64 total_avail;
b2117a39 MX	173	};
b2117a39 MX	174
1abe9b8a	175	struct map_lookup {
	176	u64 type;
	177	int io_align;
	178	int io_width;
	179	int stripe_len;
	180	int sector_size;
	181	int num_stripes;
	182	int sub_stripes;
	183	struct btrfs_bio_stripe stripes[];
	184	};
	185
a2de733c AJ	186	#define map_lookup_size(n) (sizeof(struct map_lookup) + \
	187	(sizeof(struct btrfs_bio_stripe) * (n)))
	188
f43ffb60 ID	189	/*
	190	* Restriper's general type filter
	191	*/
	192	#define BTRFS_BALANCE_DATA (1ULL << 0)
	193	#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
	194	#define BTRFS_BALANCE_METADATA (1ULL << 2)
	195
	196	#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA \| \
	197	BTRFS_BALANCE_SYSTEM \| \
	198	BTRFS_BALANCE_METADATA)
	199
c9e9f97b ID	200	struct btrfs_balance_args;
	201	struct btrfs_balance_control {
	202	struct btrfs_fs_info *fs_info;
	203
	204	struct btrfs_balance_args data;
	205	struct btrfs_balance_args meta;
	206	struct btrfs_balance_args sys;
	207
	208	u64 flags;
	209	};
	210
6d07bcec MX	211	int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
	212	u64 end, u64 *length);
	213
a1d3c478	214	#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
cea9e445 CM	215	(sizeof(struct btrfs_bio_stripe) * (n)))
cea9e445 CM	216
0b86a832 CM	217	int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
0b86a832 CM	218	struct btrfs_device *device,
e17cade2	219	u64 chunk_tree, u64 chunk_objectid,
2b82032c	220	u64 chunk_offset, u64 start, u64 num_bytes);
cea9e445 CM	221	int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
cea9e445 CM	222	u64 logical, u64 *length,
a1d3c478	223	struct btrfs_bio **bbio_ret, int mirror_num);
a512bbf8 YZ	224	int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
	225	u64 chunk_start, u64 physical, u64 devid,
	226	u64 *logical, int naddrs, int *stripe_len);
e4404d6e	227	int btrfs_read_sys_array(struct btrfs_root *root);
0b86a832 CM	228	int btrfs_read_chunk_tree(struct btrfs_root *root);
0b86a832 CM	229	int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c	230	struct btrfs_root *extent_root, u64 type);
0b86a832 CM	231	void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
0b86a832 CM	232	void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e	233	int btrfs_map_bio(struct btrfs_root root, int rw, struct bio bio,
8b712842	234	int mirror_num, int async_submit);
8a4b83cc	235	int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
97288f2c CH	236	fmode_t flags, void *holder);
97288f2c CH	237	int btrfs_scan_one_device(const char path, fmode_t flags, void holder,
8a4b83cc CM	238	struct btrfs_fs_devices **fs_devices_ret);
8a4b83cc CM	239	int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
dfe25020	240	int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
8a4b83cc CM	241	int btrfs_add_device(struct btrfs_trans_handle *trans,
	242	struct btrfs_root *root,
	243	struct btrfs_device *device);
a061fc8d	244	int btrfs_rm_device(struct btrfs_root root, char device_path);
8a4b83cc	245	int btrfs_cleanup_fs_uuids(void);
f188591e	246	int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
8f18cf13 CM	247	int btrfs_grow_device(struct btrfs_trans_handle *trans,
	248	struct btrfs_device *device, u64 new_size);
	249	struct btrfs_device btrfs_find_device(struct btrfs_root root, u64 devid,
2b82032c	250	u8 uuid, u8 fsid);
8f18cf13	251	int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb	252	int btrfs_init_new_device(struct btrfs_root root, char path);
c9e9f97b ID	253	int btrfs_balance(struct btrfs_balance_control *bctl,
c9e9f97b ID	254	struct btrfs_ioctl_balance_args *bargs);
2b82032c	255	int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
ba1bf481 JB	256	int find_free_dev_extent(struct btrfs_trans_handle *trans,
	257	struct btrfs_device *device, u64 num_bytes,
	258	u64 start, u64 max_avail);
0b86a832	259	#endif