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 #else /* CONFIG_BLK_DEV_ZONED */
  74 static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
  75                                      struct blk_zone *zone)
  76 {
  77         return 0;
  78 }
  79
  80 static inline int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
  81 {
  82         return 0;
  83 }
  84
  85 static inline int btrfs_get_dev_zone_info(struct btrfs_device *device,
  86                                           bool populate_cache)
  87 {
  88         return 0;
  89 }
  90
  91 static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { }
  92
  93 static inline int btrfs_check_zoned_mode(const struct btrfs_fs_info *fs_info)
  94 {
  95         if (!btrfs_is_zoned(fs_info))
  96                 return 0;
  97
  98         btrfs_err(fs_info, "zoned block devices support is not enabled");
  99         return -EOPNOTSUPP;
 100 }
 101
 102 static inline int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
 103 {
 104         return 0;
 105 }
 106
 107 static inline int btrfs_sb_log_location_bdev(struct block_device *bdev,
 108                                              int mirror, int rw, u64 *bytenr_ret)
 109 {
 110         *bytenr_ret = btrfs_sb_offset(mirror);
 111         return 0;
 112 }
 113
 114 static inline int btrfs_sb_log_location(struct btrfs_device *device, int mirror,
 115                                         int rw, u64 *bytenr_ret)
 116 {
 117         *bytenr_ret = btrfs_sb_offset(mirror);
 118         return 0;
 119 }
 120
 121 static inline void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
 122 { }
 123
 124 static inline int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
 125 {
 126         return 0;
 127 }
 128
 129 static inline u64 btrfs_find_allocatable_zones(struct btrfs_device *device,
 130                                                u64 hole_start, u64 hole_end,
 131                                                u64 num_bytes)
 132 {
 133         return hole_start;
 134 }
 135
 136 static inline int btrfs_reset_device_zone(struct btrfs_device *device,
 137                                           u64 physical, u64 length, u64 *bytes)
 138 {
 139         *bytes = 0;
 140         return 0;
 141 }
 142
 143 static inline int btrfs_ensure_empty_zones(struct btrfs_device *device,
 144                                            u64 start, u64 size)
 145 {
 146         return 0;
 147 }
 148
 149 static inline int btrfs_load_block_group_zone_info(
 150                 struct btrfs_block_group *cache, bool new)
 151 {
 152         return 0;
 153 }
 154
 155 static inline void btrfs_calc_zone_unusable(struct btrfs_block_group *cache) { }
 156
 157 static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 158                                           struct extent_buffer *eb) { }
 159 static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }
 160
 161 static inline bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
 162 {
 163         return false;
 164 }
 165
 166 static inline void btrfs_record_physical_zoned(struct inode *inode,
 167                                                u64 file_offset, struct bio *bio)
 168 {
 169 }
 170
 171 static inline void btrfs_rewrite_logical_zoned(
 172                                 struct btrfs_ordered_extent *ordered) { }
 173
 174 static inline bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
 175                                struct extent_buffer *eb,
 176                                struct btrfs_block_group **cache_ret)
 177 {
 178         return true;
 179 }
 180
 181 static inline void btrfs_revert_meta_write_pointer(
 182                                                 struct btrfs_block_group *cache,
 183                                                 struct extent_buffer *eb)
 184 {
 185 }
 186
 187 static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device,
 188                                             u64 physical, u64 length)
 189 {
 190         return -EOPNOTSUPP;
 191 }
 192
 193 static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
 194                                                 u64 logical, u64 physical_start,
 195                                                 u64 physical_pos)
 196 {
 197         return -EOPNOTSUPP;
 198 }
 199
 200 static inline struct btrfs_device *btrfs_zoned_get_device(
 201                                                   struct btrfs_fs_info *fs_info,
 202                                                   u64 logical, u64 length)
 203 {
 204         return ERR_PTR(-EOPNOTSUPP);
 205 }
 206
 207 static inline void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg) { }
 208
 209 static inline void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info) { }
 210 #endif
 211
 212 static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
 213 {
 214         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 215
 216         if (!zone_info)
 217                 return false;
 218
 219         return test_bit(pos >> zone_info->zone_size_shift, zone_info->seq_zones);
 220 }
 221
 222 static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos)
 223 {
 224         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 225
 226         if (!zone_info)
 227                 return true;
 228
 229         return test_bit(pos >> zone_info->zone_size_shift, zone_info->empty_zones);
 230 }
 231
 232 static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device,
 233                                                 u64 pos, bool set)
 234 {
 235         struct btrfs_zoned_device_info *zone_info = device->zone_info;
 236         unsigned int zno;
 237
 238         if (!zone_info)
 239                 return;
 240
 241         zno = pos >> zone_info->zone_size_shift;
 242         if (set)
 243                 set_bit(zno, zone_info->empty_zones);
 244         else
 245                 clear_bit(zno, zone_info->empty_zones);
 246 }
 247
 248 static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, u64 pos)
 249 {
 250         btrfs_dev_set_empty_zone_bit(device, pos, true);
 251 }
 252
 253 static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 pos)
 254 {
 255         btrfs_dev_set_empty_zone_bit(device, pos, false);
 256 }
 257
 258 static inline bool btrfs_check_device_zone_type(const struct btrfs_fs_info *fs_info,
 259                                                 struct block_device *bdev)
 260 {
 261         if (btrfs_is_zoned(fs_info)) {
 262                 /*
 263                  * We can allow a regular device on a zoned filesystem, because
 264                  * we will emulate the zoned capabilities.
 265                  */
 266                 if (!bdev_is_zoned(bdev))
 267                         return true;
 268
 269                 return fs_info->zone_size ==
 270                         (bdev_zone_sectors(bdev) << SECTOR_SHIFT);
 271         }
 272
 273         /* Do not allow Host Manged zoned device */
 274         return bdev_zoned_model(bdev) != BLK_ZONED_HM;
 275 }
 276
 277 static inline bool btrfs_check_super_location(struct btrfs_device *device, u64 pos)
 278 {
 279         /*
 280          * On a non-zoned device, any address is OK. On a zoned device,
 281          * non-SEQUENTIAL WRITE REQUIRED zones are capable.
 282          */
 283         return device->zone_info == NULL || !btrfs_dev_is_sequential(device, pos);
 284 }
 285
 286 static inline bool btrfs_can_zone_reset(struct btrfs_device *device,
 287                                         u64 physical, u64 length)
 288 {
 289         u64 zone_size;
 290
 291         if (!btrfs_dev_is_sequential(device, physical))
 292                 return false;
 293
 294         zone_size = device->zone_info->zone_size;
 295         if (!IS_ALIGNED(physical, zone_size) || !IS_ALIGNED(length, zone_size))
 296                 return false;
 297
 298         return true;
 299 }
 300
 301 static inline void btrfs_zoned_meta_io_lock(struct btrfs_fs_info *fs_info)
 302 {
 303         if (!btrfs_is_zoned(fs_info))
 304                 return;
 305         mutex_lock(&fs_info->zoned_meta_io_lock);
 306 }
 307
 308 static inline void btrfs_zoned_meta_io_unlock(struct btrfs_fs_info *fs_info)
 309 {
 310         if (!btrfs_is_zoned(fs_info))
 311                 return;
 312         mutex_unlock(&fs_info->zoned_meta_io_lock);
 313 }
 314
 315 static inline void btrfs_clear_treelog_bg(struct btrfs_block_group *bg)
 316 {
 317         struct btrfs_fs_info *fs_info = bg->fs_info;
 318
 319         if (!btrfs_is_zoned(fs_info))
 320                 return;
 321
 322         spin_lock(&fs_info->treelog_bg_lock);
 323         if (fs_info->treelog_bg == bg->start)
 324                 fs_info->treelog_bg = 0;
 325         spin_unlock(&fs_info->treelog_bg_lock);
 326 }
 327
 328 static inline void btrfs_zoned_data_reloc_lock(struct btrfs_inode *inode)
 329 {
 330         struct btrfs_root *root = inode->root;
 331
 332         if (btrfs_is_data_reloc_root(root) && btrfs_is_zoned(root->fs_info))
 333                 mutex_lock(&root->fs_info->zoned_data_reloc_io_lock);
 334 }
 335
 336 static inline void btrfs_zoned_data_reloc_unlock(struct btrfs_inode *inode)
 337 {
 338         struct btrfs_root *root = inode->root;
 339
 340         if (btrfs_is_data_reloc_root(root) && btrfs_is_zoned(root->fs_info))
 341                 mutex_unlock(&root->fs_info->zoned_data_reloc_io_lock);
 342 }
 343
 344 #endif