fs/btrfs/zoned.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef BTRFS_ZONED_H
   4 #define BTRFS_ZONED_H
   5
   6 #include <linux/types.h>
   7 #include <linux/blkdev.h>
   8 #include "volumes.h"
   9 #include "disk-io.h"
  10 #include "block-group.h"
  11 #include "btrfs_inode.h"
  12
  13 /*
  14  * Block groups with more than this value (percents) of unusable space will be
  15  * scheduled for background reclaim.
  16  */
  17 #define BTRFS_DEFAULT_RECLAIM_THRESH            75
  18
  19 struct btrfs_zoned_device_info {
  20         /*
  21          * Number of zones, zone size and types of zones if bdev is a
  22          * zoned block device.
  23          */
  24         u64 zone_size;
  25         u8  zone_size_shift;
  26         u32 nr_zones;
  27         unsigned long *seq_zones;
  28         unsigned long *empty_zones;
  29         struct blk_zone *zone_cache;
  30         struct blk_zone sb_zones[2 * BTRFS_SUPER_MIRROR_MAX];
  31 };
  32
  33 #ifdef CONFIG_BLK_DEV_ZONED
  34 int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
  35                        struct blk_zone *zone);
  36 int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info);
  37 int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache);
  38 void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
  39 int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
  40 int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info);
  41 int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
  42                                u64 *bytenr_ret);
  43 int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
  44                           u64 *bytenr_ret);
  45 void btrfs_advance_sb_log(struct btrfs_device *device, int mirror);
  46 int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror);
  47 u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
  48                                  u64 hole_end, u64 num_bytes);
  49 int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
  50                             u64 length, u64 *bytes);
  51 int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size);
  52 int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new);
  53 void btrfs_calc_zone_unusable(struct btrfs_block_group *cache);
  54 void btrfs_redirty_list_add(struct btrfs_transaction *trans,
  55                             struct extent_buffer *eb);
  56 void btrfs_free_redirty_list(struct btrfs_transaction *trans);
  57 bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start);
  58 void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
  59                                  struct bio *bio);
  60 void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered);
  61 bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
  62                                     struct extent_buffer *eb,
  63                                     struct btrfs_block_group **cache_ret);
  64 void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
  65                                      struct extent_buffer *eb);
  66 int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
  67 int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
  68                                   u64 physical_start, u64 physical_pos);
  69 struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
  70                                             u64 logical, u64 length);
  71 void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg);
  72 void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info);
  73 void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,
  74                                        u64 length);
  75 #else /* CONFIG_BLK_DEV_ZONED */
  76 static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
  77                                      struct blk_zone *zone)
  78 {
  79         return 0;
  80 }
  81
  82 static inline int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
  83 {
  84         return 0;
  85 }
  86
  87 static inline int btrfs_get_dev_zone_info(struct btrfs_device *device,
  88                                           bool populate_cache)
  89 {
  90         return 0;
  91 }
  92
  93 static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { }
  94
  95 static inline int btrfs_check_zoned_mode(const struct btrfs_fs_info *fs_info)
  96 {
  97         if (!btrfs_is_zoned(fs_info))
  98                 return 0;
  99
 100         btrfs_err(fs_info, "zoned block devices support is not enabled");
 101         return -EOPNOTSUPP;
 102 }
 103
 104 static inline int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
 105 {
 106         return 0;
 107 }
 108
 109 static inline int btrfs_sb_log_location_bdev(struct block_device *bdev,
 110                                              int mirror, int rw, u64 *bytenr_ret)
 111 {
 112         *bytenr_ret = btrfs_sb_offset(mirror);
 113         return 0;
 114 }
 115
 116 static inline int btrfs_sb_log_location(struct btrfs_device *device, int mirror,
 117                                         int rw, u64 *bytenr_ret)
 118 {
 119         *bytenr_ret = btrfs_sb_offset(mirror);
 120         return 0;
 121 }
 122
 123 static inline void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
 124 { }
 125
 126 static inline int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
 127 {
 128         return 0;
 129 }
 130
 131 static inline u64 btrfs_find_allocatable_zones(struct btrfs_device *device,
 132                                                u64 hole_start, u64 hole_end,
 133                                                u64 num_bytes)
 134 {
 135         return hole_start;
 136 }
 137
 138 static inline int btrfs_reset_device_zone(struct btrfs_device *device,
 139                                           u64 physical, u64 length, u64 *bytes)
 140 {
 141         *bytes = 0;
 142         return 0;
 143 }
 144
 145 static inline int btrfs_ensure_empty_zones(struct btrfs_device *device,
 146                                            u64 start, u64 size)
 147 {
 148         return 0;
 149 }
 150
 151 static inline int btrfs_load_block_group_zone_info(
 152                 struct btrfs_block_group *cache, bool new)
 153 {
 154         return 0;
 155 }
 156
 157 static inline void btrfs_calc_zone_unusable(struct btrfs_block_group *cache) { }
 158
 159 static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 160                                           struct extent_buffer *eb) { }
 161 static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }
 162
 163 static inline bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
 164 {
 165         return false;
 166 }
 167
 168 static inline void btrfs_record_physical_zoned(struct inode *inode,
 169                                                u64 file_offset, struct bio *bio)
 170 {
 171 }
 172
 173 static inline void btrfs_rewrite_logical_zoned(
 174                                 struct btrfs_ordered_extent *ordered) { }
 175
 176 static inline bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
 177                                struct extent_buffer *eb,
 178                                struct btrfs_block_group **cache_ret)
 179 {
 180         return true;
 181 }
 182
 183 static inline void btrfs_revert_meta_write_pointer(
 184                                                 struct btrfs_block_group *cache,
 185                                                 struct extent_buffer *eb)
 186 {
 187 }
 188
 189 static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device,
 190                                             u64 physical, u64 length)
 191 {
 192         return -EOPNOTSUPP;
 193 }
 194
 195 static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
 196                                                 u64 logical, u64 physical_start,
 197                                                 u64 physical_pos)
 198 {
 199         return -EOPNOTSUPP;
 200 }
 201
 202 static inline struct btrfs_device *btrfs_zoned_get_device(
 203                                                   struct btrfs_fs_info *fs_info,
 204                                                   u64 logical, u64 length)
 205 {
 206         return ERR_PTR(-EOPNOTSUPP);
 207 }
 208
 209 static inline void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg) { }
 210
 211 static inline void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info) { }
 212
 213 static inline void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info,
 214                                                      u64 logical, u64 length) { }
 215 #endif
 216
 217 static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
 218 {
 219         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 220
 221         if (!zone_info)
 222                 return false;
 223
 224         return test_bit(pos >> zone_info->zone_size_shift, zone_info->seq_zones);
 225 }
 226
 227 static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos)
 228 {
 229         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 230
 231         if (!zone_info)
 232                 return true;
 233
 234         return test_bit(pos >> zone_info->zone_size_shift, zone_info->empty_zones);
 235 }
 236
 237 static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device,
 238                                                 u64 pos, bool set)
 239 {
 240         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 241         unsigned int zno;
 242
 243         if (!zone_info)
 244                 return;
 245
 246         zno = pos >> zone_info->zone_size_shift;
 247         if (set)
 248                 set_bit(zno, zone_info->empty_zones);
 249         else
 250                 clear_bit(zno, zone_info->empty_zones);
 251 }
 252
 253 static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, u64 pos)
 254 {
 255         btrfs_dev_set_empty_zone_bit(device, pos, true);
 256 }
 257
 258 static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 pos)
 259 {
 260         btrfs_dev_set_empty_zone_bit(device, pos, false);
 261 }
 262
 263 static inline bool btrfs_check_device_zone_type(const struct btrfs_fs_info *fs_info,
 264                                                 struct block_device *bdev)
 265 {
 266         if (btrfs_is_zoned(fs_info)) {
 267                 /*
 268                  * We can allow a regular device on a zoned filesystem, because
 269                  * we will emulate the zoned capabilities.
 270                  */
 271                 if (!bdev_is_zoned(bdev))
 272                         return true;
 273
 274                 return fs_info->zone_size ==
 275                         (bdev_zone_sectors(bdev) << SECTOR_SHIFT);
 276         }
 277
 278         /* Do not allow Host Manged zoned device */
 279         return bdev_zoned_model(bdev) != BLK_ZONED_HM;
 280 }
 281
 282 static inline bool btrfs_check_super_location(struct btrfs_device *device, u64 pos)
 283 {
 284         /*
 285          * On a non-zoned device, any address is OK. On a zoned device,
 286          * non-SEQUENTIAL WRITE REQUIRED zones are capable.
 287          */
 288         return device->zone_info == NULL || !btrfs_dev_is_sequential(device, pos);
 289 }
 290
 291 static inline bool btrfs_can_zone_reset(struct btrfs_device *device,
 292                                         u64 physical, u64 length)
 293 {
 294         u64 zone_size;
 295
 296         if (!btrfs_dev_is_sequential(device, physical))
 297                 return false;
 298
 299         zone_size = device->zone_info->zone_size;
 300         if (!IS_ALIGNED(physical, zone_size) || !IS_ALIGNED(length, zone_size))
 301                 return false;
 302
 303         return true;
 304 }
 305
 306 static inline void btrfs_zoned_meta_io_lock(struct btrfs_fs_info *fs_info)
 307 {
 308         if (!btrfs_is_zoned(fs_info))
 309                 return;
 310         mutex_lock(&fs_info->zoned_meta_io_lock);
 311 }
 312
 313 static inline void btrfs_zoned_meta_io_unlock(struct btrfs_fs_info *fs_info)
 314 {
 315         if (!btrfs_is_zoned(fs_info))
 316                 return;
 317         mutex_unlock(&fs_info->zoned_meta_io_lock);
 318 }
 319
 320 static inline void btrfs_clear_treelog_bg(struct btrfs_block_group *bg)
 321 {
 322         struct btrfs_fs_info *fs_info = bg->fs_info;
 323
 324         if (!btrfs_is_zoned(fs_info))
 325                 return;
 326
 327         spin_lock(&fs_info->treelog_bg_lock);
 328         if (fs_info->treelog_bg == bg->start)
 329                 fs_info->treelog_bg = 0;
 330         spin_unlock(&fs_info->treelog_bg_lock);
 331 }
 332
 333 static inline void btrfs_zoned_data_reloc_lock(struct btrfs_inode *inode)
 334 {
 335         struct btrfs_root *root = inode->root;
 336
 337         if (btrfs_is_data_reloc_root(root) && btrfs_is_zoned(root->fs_info))
 338                 mutex_lock(&root->fs_info->zoned_data_reloc_io_lock);
 339 }
 340
 341 static inline void btrfs_zoned_data_reloc_unlock(struct btrfs_inode *inode)
 342 {
 343         struct btrfs_root *root = inode->root;
 344
 345         if (btrfs_is_data_reloc_root(root) && btrfs_is_zoned(root->fs_info))
 346                 mutex_unlock(&root->fs_info->zoned_data_reloc_io_lock);
 347 }
 348
 349 #endif