2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_VOLUMES_H__
20 #define __BTRFS_VOLUMES_H__
22 #include "kerncompat.h"
25 #define BTRFS_STRIPE_LEN SZ_64K
28 struct list_head dev_list;
29 struct btrfs_root *dev_root;
30 struct btrfs_fs_devices *fs_devices;
40 /* these are read off the super block, only in the progs */
47 /* the internal btrfs device id */
50 /* size of the device */
56 /* optimal io alignment for this device */
59 /* optimal io width for this device */
62 /* minimal io size for this device */
65 /* type and info about this device */
68 /* physical drive uuid (or lvm uuid) */
69 u8 uuid[BTRFS_UUID_SIZE];
72 struct btrfs_fs_devices {
73 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
75 /* the device with this id has the most recent copy of the super */
81 struct list_head devices;
82 struct list_head list;
85 struct btrfs_fs_devices *seed;
88 struct btrfs_bio_stripe {
89 struct btrfs_device *dev;
93 struct btrfs_multi_bio {
96 struct btrfs_bio_stripe stripes[];
100 struct cache_extent ce;
108 struct btrfs_bio_stripe stripes[];
111 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
112 (sizeof(struct btrfs_bio_stripe) * (n)))
113 #define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
114 (sizeof(struct btrfs_bio_stripe) * (n)))
117 * Restriper's general type filter
119 #define BTRFS_BALANCE_DATA (1ULL << 0)
120 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
121 #define BTRFS_BALANCE_METADATA (1ULL << 2)
123 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
124 BTRFS_BALANCE_SYSTEM | \
125 BTRFS_BALANCE_METADATA)
127 #define BTRFS_BALANCE_FORCE (1ULL << 3)
128 #define BTRFS_BALANCE_RESUME (1ULL << 4)
133 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
134 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
135 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
136 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
137 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
138 #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
139 #define BTRFS_BALANCE_ARGS_LIMIT_RANGE (1ULL << 6)
140 #define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
141 #define BTRFS_BALANCE_ARGS_USAGE_RANGE (1ULL << 10)
144 * Profile changing flags. When SOFT is set we won't relocate chunk if
145 * it already has the target profile (even though it may be
148 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
149 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
151 #define BTRFS_RAID5_P_STRIPE ((u64)-2)
152 #define BTRFS_RAID6_Q_STRIPE ((u64)-1)
155 * Check if the given range cross stripes.
156 * To ensure kernel scrub won't causing bug on with METADATA in mixed
159 * Return 1 if the range crosses STRIPE boundary
160 * Return 0 if the range doesn't cross STRIPE boundary or it
161 * doesn't belong to any block group (no boundary to cross)
163 static inline int check_crossing_stripes(struct btrfs_fs_info *fs_info,
166 struct btrfs_block_group_cache *bg_cache;
169 bg_cache = btrfs_lookup_block_group(fs_info, start);
171 * Does not belong to block group, no boundary to cross
172 * although it's a bigger problem, but here we don't care.
176 bg_offset = start - bg_cache->key.objectid;
178 return (bg_offset / BTRFS_STRIPE_LEN !=
179 (bg_offset + len - 1) / BTRFS_STRIPE_LEN);
182 int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
183 u64 logical, u64 *length, u64 *type,
184 struct btrfs_multi_bio **multi_ret, int mirror_num,
186 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
187 u64 logical, u64 *length,
188 struct btrfs_multi_bio **multi_ret, int mirror_num,
190 int btrfs_next_bg(struct btrfs_fs_info *map_tree, u64 *logical,
191 u64 *size, u64 type);
192 static inline int btrfs_next_bg_metadata(struct btrfs_fs_info *fs_info,
193 u64 *logical, u64 *size)
195 return btrfs_next_bg(fs_info, logical, size,
196 BTRFS_BLOCK_GROUP_METADATA);
198 static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
199 u64 *logical, u64 *size)
201 return btrfs_next_bg(fs_info, logical, size,
202 BTRFS_BLOCK_GROUP_SYSTEM);
204 int btrfs_rmap_block(struct btrfs_fs_info *fs_info,
205 u64 chunk_start, u64 physical, u64 devid,
206 u64 **logical, int *naddrs, int *stripe_len);
207 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
208 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
209 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
210 struct btrfs_fs_info *fs_info, u64 *start,
211 u64 *num_bytes, u64 type);
212 int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
213 struct btrfs_fs_info *fs_info, u64 *start,
214 u64 num_bytes, u64 type, int convert);
215 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
217 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
218 void btrfs_close_all_devices(void);
219 int btrfs_add_device(struct btrfs_trans_handle *trans,
220 struct btrfs_fs_info *fs_info,
221 struct btrfs_device *device);
222 int btrfs_update_device(struct btrfs_trans_handle *trans,
223 struct btrfs_device *device);
224 int btrfs_scan_one_device(int fd, const char *path,
225 struct btrfs_fs_devices **fs_devices_ret,
226 u64 *total_devs, u64 super_offset, unsigned sbflags);
227 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
228 struct list_head *btrfs_scanned_uuids(void);
229 int btrfs_add_system_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
230 struct btrfs_chunk *chunk, int item_size);
231 int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
232 struct btrfs_device *
233 btrfs_find_device_by_devid(struct btrfs_fs_devices *fs_devices,
234 u64 devid, int instance);
235 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
237 int write_raid56_with_parity(struct btrfs_fs_info *info,
238 struct extent_buffer *eb,
239 struct btrfs_multi_bio *multi,
240 u64 stripe_len, u64 *raid_map);
241 int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
242 struct extent_buffer *leaf,
243 struct btrfs_chunk *chunk,
244 int slot, u64 logical);
245 u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
246 struct extent_buffer *leaf,
247 struct btrfs_chunk *chunk);