mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
96a14336bd
It's used only during initial block group reading to map physical address of super block to a list of logical ones. Make it private to block-group.c, add proper kernel doc and ensure it's exported only for tests. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
292 lines
9.3 KiB
C
292 lines
9.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_BLOCK_GROUP_H
|
|
#define BTRFS_BLOCK_GROUP_H
|
|
|
|
#include "free-space-cache.h"
|
|
|
|
enum btrfs_disk_cache_state {
|
|
BTRFS_DC_WRITTEN,
|
|
BTRFS_DC_ERROR,
|
|
BTRFS_DC_CLEAR,
|
|
BTRFS_DC_SETUP,
|
|
};
|
|
|
|
/*
|
|
* This describes the state of the block_group for async discard. This is due
|
|
* to the two pass nature of it where extent discarding is prioritized over
|
|
* bitmap discarding. BTRFS_DISCARD_RESET_CURSOR is set when we are resetting
|
|
* between lists to prevent contention for discard state variables
|
|
* (eg. discard_cursor).
|
|
*/
|
|
enum btrfs_discard_state {
|
|
BTRFS_DISCARD_EXTENTS,
|
|
BTRFS_DISCARD_BITMAPS,
|
|
BTRFS_DISCARD_RESET_CURSOR,
|
|
};
|
|
|
|
/*
|
|
* Control flags for do_chunk_alloc's force field CHUNK_ALLOC_NO_FORCE means to
|
|
* only allocate a chunk if we really need one.
|
|
*
|
|
* CHUNK_ALLOC_LIMITED means to only try and allocate one if we have very few
|
|
* chunks already allocated. This is used as part of the clustering code to
|
|
* help make sure we have a good pool of storage to cluster in, without filling
|
|
* the FS with empty chunks
|
|
*
|
|
* CHUNK_ALLOC_FORCE means it must try to allocate one
|
|
*/
|
|
enum btrfs_chunk_alloc_enum {
|
|
CHUNK_ALLOC_NO_FORCE,
|
|
CHUNK_ALLOC_LIMITED,
|
|
CHUNK_ALLOC_FORCE,
|
|
};
|
|
|
|
struct btrfs_caching_control {
|
|
struct list_head list;
|
|
struct mutex mutex;
|
|
wait_queue_head_t wait;
|
|
struct btrfs_work work;
|
|
struct btrfs_block_group *block_group;
|
|
u64 progress;
|
|
refcount_t count;
|
|
};
|
|
|
|
/* Once caching_thread() finds this much free space, it will wake up waiters. */
|
|
#define CACHING_CTL_WAKE_UP SZ_2M
|
|
|
|
struct btrfs_block_group {
|
|
struct btrfs_fs_info *fs_info;
|
|
struct inode *inode;
|
|
spinlock_t lock;
|
|
u64 start;
|
|
u64 length;
|
|
u64 pinned;
|
|
u64 reserved;
|
|
u64 used;
|
|
u64 delalloc_bytes;
|
|
u64 bytes_super;
|
|
u64 flags;
|
|
u64 cache_generation;
|
|
|
|
/*
|
|
* If the free space extent count exceeds this number, convert the block
|
|
* group to bitmaps.
|
|
*/
|
|
u32 bitmap_high_thresh;
|
|
|
|
/*
|
|
* If the free space extent count drops below this number, convert the
|
|
* block group back to extents.
|
|
*/
|
|
u32 bitmap_low_thresh;
|
|
|
|
/*
|
|
* It is just used for the delayed data space allocation because
|
|
* only the data space allocation and the relative metadata update
|
|
* can be done cross the transaction.
|
|
*/
|
|
struct rw_semaphore data_rwsem;
|
|
|
|
/* For raid56, this is a full stripe, without parity */
|
|
unsigned long full_stripe_len;
|
|
|
|
unsigned int ro;
|
|
unsigned int iref:1;
|
|
unsigned int has_caching_ctl:1;
|
|
unsigned int removed:1;
|
|
|
|
int disk_cache_state;
|
|
|
|
/* Cache tracking stuff */
|
|
int cached;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
u64 last_byte_to_unpin;
|
|
|
|
struct btrfs_space_info *space_info;
|
|
|
|
/* Free space cache stuff */
|
|
struct btrfs_free_space_ctl *free_space_ctl;
|
|
|
|
/* Block group cache stuff */
|
|
struct rb_node cache_node;
|
|
|
|
/* For block groups in the same raid type */
|
|
struct list_head list;
|
|
|
|
/* Usage count */
|
|
atomic_t count;
|
|
|
|
/*
|
|
* List of struct btrfs_free_clusters for this block group.
|
|
* Today it will only have one thing on it, but that may change
|
|
*/
|
|
struct list_head cluster_list;
|
|
|
|
/* For delayed block group creation or deletion of empty block groups */
|
|
struct list_head bg_list;
|
|
|
|
/* For read-only block groups */
|
|
struct list_head ro_list;
|
|
|
|
/* For discard operations */
|
|
atomic_t trimming;
|
|
struct list_head discard_list;
|
|
int discard_index;
|
|
u64 discard_eligible_time;
|
|
u64 discard_cursor;
|
|
enum btrfs_discard_state discard_state;
|
|
|
|
/* For dirty block groups */
|
|
struct list_head dirty_list;
|
|
struct list_head io_list;
|
|
|
|
struct btrfs_io_ctl io_ctl;
|
|
|
|
/*
|
|
* Incremented when doing extent allocations and holding a read lock
|
|
* on the space_info's groups_sem semaphore.
|
|
* Decremented when an ordered extent that represents an IO against this
|
|
* block group's range is created (after it's added to its inode's
|
|
* root's list of ordered extents) or immediately after the allocation
|
|
* if it's a metadata extent or fallocate extent (for these cases we
|
|
* don't create ordered extents).
|
|
*/
|
|
atomic_t reservations;
|
|
|
|
/*
|
|
* Incremented while holding the spinlock *lock* by a task checking if
|
|
* it can perform a nocow write (incremented if the value for the *ro*
|
|
* field is 0). Decremented by such tasks once they create an ordered
|
|
* extent or before that if some error happens before reaching that step.
|
|
* This is to prevent races between block group relocation and nocow
|
|
* writes through direct IO.
|
|
*/
|
|
atomic_t nocow_writers;
|
|
|
|
/* Lock for free space tree operations. */
|
|
struct mutex free_space_lock;
|
|
|
|
/*
|
|
* Does the block group need to be added to the free space tree?
|
|
* Protected by free_space_lock.
|
|
*/
|
|
int needs_free_space;
|
|
|
|
/* Record locked full stripes for RAID5/6 block group */
|
|
struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
|
|
};
|
|
|
|
static inline u64 btrfs_block_group_end(struct btrfs_block_group *block_group)
|
|
{
|
|
return (block_group->start + block_group->length);
|
|
}
|
|
|
|
static inline bool btrfs_is_block_group_data_only(
|
|
struct btrfs_block_group *block_group)
|
|
{
|
|
/*
|
|
* In mixed mode the fragmentation is expected to be high, lowering the
|
|
* efficiency, so only proper data block groups are considered.
|
|
*/
|
|
return (block_group->flags & BTRFS_BLOCK_GROUP_DATA) &&
|
|
!(block_group->flags & BTRFS_BLOCK_GROUP_METADATA);
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
static inline int btrfs_should_fragment_free_space(
|
|
struct btrfs_block_group *block_group)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
|
|
return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
|
|
block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
|
|
(btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
|
|
block_group->flags & BTRFS_BLOCK_GROUP_DATA);
|
|
}
|
|
#endif
|
|
|
|
struct btrfs_block_group *btrfs_lookup_first_block_group(
|
|
struct btrfs_fs_info *info, u64 bytenr);
|
|
struct btrfs_block_group *btrfs_lookup_block_group(
|
|
struct btrfs_fs_info *info, u64 bytenr);
|
|
struct btrfs_block_group *btrfs_next_block_group(
|
|
struct btrfs_block_group *cache);
|
|
void btrfs_get_block_group(struct btrfs_block_group *cache);
|
|
void btrfs_put_block_group(struct btrfs_block_group *cache);
|
|
void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
|
|
const u64 start);
|
|
void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg);
|
|
bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
|
|
void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
|
|
void btrfs_wait_nocow_writers(struct btrfs_block_group *bg);
|
|
void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache,
|
|
u64 num_bytes);
|
|
int btrfs_wait_block_group_cache_done(struct btrfs_block_group *cache);
|
|
int btrfs_cache_block_group(struct btrfs_block_group *cache,
|
|
int load_cache_only);
|
|
void btrfs_put_caching_control(struct btrfs_caching_control *ctl);
|
|
struct btrfs_caching_control *btrfs_get_caching_control(
|
|
struct btrfs_block_group *cache);
|
|
u64 add_new_free_space(struct btrfs_block_group *block_group,
|
|
u64 start, u64 end);
|
|
struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
|
|
struct btrfs_fs_info *fs_info,
|
|
const u64 chunk_offset);
|
|
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
|
|
u64 group_start, struct extent_map *em);
|
|
void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
|
|
void btrfs_mark_bg_unused(struct btrfs_block_group *bg);
|
|
int btrfs_read_block_groups(struct btrfs_fs_info *info);
|
|
int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 bytes_used,
|
|
u64 type, u64 chunk_offset, u64 size);
|
|
void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
|
|
int btrfs_inc_block_group_ro(struct btrfs_block_group *cache,
|
|
bool do_chunk_alloc);
|
|
void btrfs_dec_block_group_ro(struct btrfs_block_group *cache);
|
|
int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
|
|
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans);
|
|
int btrfs_setup_space_cache(struct btrfs_trans_handle *trans);
|
|
int btrfs_update_block_group(struct btrfs_trans_handle *trans,
|
|
u64 bytenr, u64 num_bytes, int alloc);
|
|
int btrfs_add_reserved_bytes(struct btrfs_block_group *cache,
|
|
u64 ram_bytes, u64 num_bytes, int delalloc);
|
|
void btrfs_free_reserved_bytes(struct btrfs_block_group *cache,
|
|
u64 num_bytes, int delalloc);
|
|
int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
|
|
enum btrfs_chunk_alloc_enum force);
|
|
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
|
|
void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
|
|
u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags);
|
|
void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
|
|
int btrfs_free_block_groups(struct btrfs_fs_info *info);
|
|
|
|
static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA);
|
|
}
|
|
|
|
static inline u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
}
|
|
|
|
static inline u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
}
|
|
|
|
static inline int btrfs_block_group_done(struct btrfs_block_group *cache)
|
|
{
|
|
smp_mb();
|
|
return cache->cached == BTRFS_CACHE_FINISHED ||
|
|
cache->cached == BTRFS_CACHE_ERROR;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
|
|
u64 physical, u64 **logical, int *naddrs, int *stripe_len);
|
|
#endif
|
|
|
|
#endif /* BTRFS_BLOCK_GROUP_H */
|