Root/fs/btrfs/volumes.h

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_
21
22#include <linux/bio.h>
23#include "async-thread.h"
24
25struct buffer_head;
26struct btrfs_pending_bios {
27    struct bio *head;
28    struct bio *tail;
29};
30
31struct btrfs_device {
32    struct list_head dev_list;
33    struct list_head dev_alloc_list;
34    struct btrfs_fs_devices *fs_devices;
35    struct btrfs_root *dev_root;
36
37    /* regular prio bios */
38    struct btrfs_pending_bios pending_bios;
39    /* WRITE_SYNC bios */
40    struct btrfs_pending_bios pending_sync_bios;
41
42    int running_pending;
43    u64 generation;
44
45    int barriers;
46    int writeable;
47    int in_fs_metadata;
48
49    spinlock_t io_lock;
50
51    struct block_device *bdev;
52
53    /* the mode sent to open_bdev_exclusive */
54    fmode_t mode;
55
56    char *name;
57
58    /* the internal btrfs device id */
59    u64 devid;
60
61    /* size of the device */
62    u64 total_bytes;
63
64    /* size of the disk */
65    u64 disk_total_bytes;
66
67    /* bytes used */
68    u64 bytes_used;
69
70    /* optimal io alignment for this device */
71    u32 io_align;
72
73    /* optimal io width for this device */
74    u32 io_width;
75
76    /* minimal io size for this device */
77    u32 sector_size;
78
79    /* type and info about this device */
80    u64 type;
81
82    /* physical drive uuid (or lvm uuid) */
83    u8 uuid[BTRFS_UUID_SIZE];
84
85    struct btrfs_work work;
86};
87
88struct btrfs_fs_devices {
89    u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
90
91    /* the device with this id has the most recent copy of the super */
92    u64 latest_devid;
93    u64 latest_trans;
94    u64 num_devices;
95    u64 open_devices;
96    u64 rw_devices;
97    u64 total_rw_bytes;
98    struct block_device *latest_bdev;
99
100    /* all of the devices in the FS, protected by a mutex
101     * so we can safely walk it to write out the supers without
102     * worrying about add/remove by the multi-device code
103     */
104    struct mutex device_list_mutex;
105    struct list_head devices;
106
107    /* devices not currently being allocated */
108    struct list_head alloc_list;
109    struct list_head list;
110
111    struct btrfs_fs_devices *seed;
112    int seeding;
113
114    int opened;
115
116    /* set when we find or add a device that doesn't have the
117     * nonrot flag set
118     */
119    int rotating;
120};
121
122struct btrfs_bio_stripe {
123    struct btrfs_device *dev;
124    u64 physical;
125};
126
127struct btrfs_multi_bio {
128    atomic_t stripes_pending;
129    bio_end_io_t *end_io;
130    struct bio *orig_bio;
131    void *private;
132    atomic_t error;
133    int max_errors;
134    int num_stripes;
135    struct btrfs_bio_stripe stripes[];
136};
137
138#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
139                (sizeof(struct btrfs_bio_stripe) * (n)))
140
141int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
142               struct btrfs_device *device,
143               u64 chunk_tree, u64 chunk_objectid,
144               u64 chunk_offset, u64 start, u64 num_bytes);
145int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
146            u64 logical, u64 *length,
147            struct btrfs_multi_bio **multi_ret, int mirror_num);
148int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
149             u64 chunk_start, u64 physical, u64 devid,
150             u64 **logical, int *naddrs, int *stripe_len);
151int btrfs_read_sys_array(struct btrfs_root *root);
152int btrfs_read_chunk_tree(struct btrfs_root *root);
153int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
154              struct btrfs_root *extent_root, u64 type);
155void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
156void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
157int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
158          int mirror_num, int async_submit);
159int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
160int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
161               fmode_t flags, void *holder);
162int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
163              struct btrfs_fs_devices **fs_devices_ret);
164int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
165int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
166int btrfs_add_device(struct btrfs_trans_handle *trans,
167             struct btrfs_root *root,
168             struct btrfs_device *device);
169int btrfs_rm_device(struct btrfs_root *root, char *device_path);
170int btrfs_cleanup_fs_uuids(void);
171int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
172int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
173              u64 logical, struct page *page);
174int btrfs_grow_device(struct btrfs_trans_handle *trans,
175              struct btrfs_device *device, u64 new_size);
176struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
177                       u8 *uuid, u8 *fsid);
178int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
179int btrfs_init_new_device(struct btrfs_root *root, char *path);
180int btrfs_balance(struct btrfs_root *dev_root);
181void btrfs_unlock_volumes(void);
182void btrfs_lock_volumes(void);
183int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
184int find_free_dev_extent(struct btrfs_trans_handle *trans,
185             struct btrfs_device *device, u64 num_bytes,
186             u64 *start, u64 *max_avail);
187#endif
188

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