242 lines
7.3 KiB
C
242 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_SPACE_INFO_H
|
|
#define BTRFS_SPACE_INFO_H
|
|
|
|
#include "volumes.h"
|
|
|
|
/*
|
|
* Different levels for to flush space when doing space reservations.
|
|
*
|
|
* The higher the level, the more methods we try to reclaim space.
|
|
*/
|
|
enum btrfs_reserve_flush_enum {
|
|
/* If we are in the transaction, we can't flush anything.*/
|
|
BTRFS_RESERVE_NO_FLUSH,
|
|
|
|
/*
|
|
* Flush space by:
|
|
* - Running delayed inode items
|
|
* - Allocating a new chunk
|
|
*/
|
|
BTRFS_RESERVE_FLUSH_LIMIT,
|
|
|
|
/*
|
|
* Flush space by:
|
|
* - Running delayed inode items
|
|
* - Running delayed refs
|
|
* - Running delalloc and waiting for ordered extents
|
|
* - Allocating a new chunk
|
|
*/
|
|
BTRFS_RESERVE_FLUSH_EVICT,
|
|
|
|
/*
|
|
* Flush space by above mentioned methods and by:
|
|
* - Running delayed iputs
|
|
* - Committing transaction
|
|
*
|
|
* Can be interrupted by a fatal signal.
|
|
*/
|
|
BTRFS_RESERVE_FLUSH_DATA,
|
|
BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
|
|
BTRFS_RESERVE_FLUSH_ALL,
|
|
|
|
/*
|
|
* Pretty much the same as FLUSH_ALL, but can also steal space from
|
|
* global rsv.
|
|
*
|
|
* Can be interrupted by a fatal signal.
|
|
*/
|
|
BTRFS_RESERVE_FLUSH_ALL_STEAL,
|
|
|
|
/*
|
|
* This is for btrfs_use_block_rsv only. We have exhausted our block
|
|
* rsv and our global block rsv. This can happen for things like
|
|
* delalloc where we are overwriting a lot of extents with a single
|
|
* extent and didn't reserve enough space. Alternatively it can happen
|
|
* with delalloc where we reserve 1 extents worth for a large extent but
|
|
* fragmentation leads to multiple extents being created. This will
|
|
* give us the reservation in the case of
|
|
*
|
|
* if (num_bytes < (space_info->total_bytes -
|
|
* btrfs_space_info_used(space_info, false))
|
|
*
|
|
* Which ignores bytes_may_use. This is potentially dangerous, but our
|
|
* reservation system is generally pessimistic so is able to absorb this
|
|
* style of mistake.
|
|
*/
|
|
BTRFS_RESERVE_FLUSH_EMERGENCY,
|
|
};
|
|
|
|
enum btrfs_flush_state {
|
|
FLUSH_DELAYED_ITEMS_NR = 1,
|
|
FLUSH_DELAYED_ITEMS = 2,
|
|
FLUSH_DELAYED_REFS_NR = 3,
|
|
FLUSH_DELAYED_REFS = 4,
|
|
FLUSH_DELALLOC = 5,
|
|
FLUSH_DELALLOC_WAIT = 6,
|
|
FLUSH_DELALLOC_FULL = 7,
|
|
ALLOC_CHUNK = 8,
|
|
ALLOC_CHUNK_FORCE = 9,
|
|
RUN_DELAYED_IPUTS = 10,
|
|
COMMIT_TRANS = 11,
|
|
};
|
|
|
|
struct btrfs_space_info {
|
|
spinlock_t lock;
|
|
|
|
u64 total_bytes; /* total bytes in the space,
|
|
this doesn't take mirrors into account */
|
|
u64 bytes_used; /* total bytes used,
|
|
this doesn't take mirrors into account */
|
|
u64 bytes_pinned; /* total bytes pinned, will be freed when the
|
|
transaction finishes */
|
|
u64 bytes_reserved; /* total bytes the allocator has reserved for
|
|
current allocations */
|
|
u64 bytes_may_use; /* number of bytes that may be used for
|
|
delalloc/allocations */
|
|
u64 bytes_readonly; /* total bytes that are read only */
|
|
/* Total bytes in the space, but only accounts active block groups. */
|
|
u64 active_total_bytes;
|
|
u64 bytes_zone_unusable; /* total bytes that are unusable until
|
|
resetting the device zone */
|
|
|
|
u64 max_extent_size; /* This will hold the maximum extent size of
|
|
the space info if we had an ENOSPC in the
|
|
allocator. */
|
|
/* Chunk size in bytes */
|
|
u64 chunk_size;
|
|
|
|
/*
|
|
* Once a block group drops below this threshold (percents) we'll
|
|
* schedule it for reclaim.
|
|
*/
|
|
int bg_reclaim_threshold;
|
|
|
|
int clamp; /* Used to scale our threshold for preemptive
|
|
flushing. The value is >> clamp, so turns
|
|
out to be a 2^clamp divisor. */
|
|
|
|
unsigned int full:1; /* indicates that we cannot allocate any more
|
|
chunks for this space */
|
|
unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
|
|
|
|
unsigned int flush:1; /* set if we are trying to make space */
|
|
|
|
unsigned int force_alloc; /* set if we need to force a chunk
|
|
alloc for this space */
|
|
|
|
u64 disk_used; /* total bytes used on disk */
|
|
u64 disk_total; /* total bytes on disk, takes mirrors into
|
|
account */
|
|
|
|
u64 flags;
|
|
|
|
struct list_head list;
|
|
/* Protected by the spinlock 'lock'. */
|
|
struct list_head ro_bgs;
|
|
struct list_head priority_tickets;
|
|
struct list_head tickets;
|
|
|
|
/*
|
|
* Size of space that needs to be reclaimed in order to satisfy pending
|
|
* tickets
|
|
*/
|
|
u64 reclaim_size;
|
|
|
|
/*
|
|
* tickets_id just indicates the next ticket will be handled, so note
|
|
* it's not stored per ticket.
|
|
*/
|
|
u64 tickets_id;
|
|
|
|
struct rw_semaphore groups_sem;
|
|
/* for block groups in our same type */
|
|
struct list_head block_groups[BTRFS_NR_RAID_TYPES];
|
|
|
|
struct kobject kobj;
|
|
struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
|
|
};
|
|
|
|
struct reserve_ticket {
|
|
u64 bytes;
|
|
int error;
|
|
bool steal;
|
|
struct list_head list;
|
|
wait_queue_head_t wait;
|
|
};
|
|
|
|
static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
|
|
{
|
|
return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
|
|
(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Declare a helper function to detect underflow of various space info members
|
|
*/
|
|
#define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \
|
|
static inline void \
|
|
btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \
|
|
struct btrfs_space_info *sinfo, \
|
|
s64 bytes) \
|
|
{ \
|
|
const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \
|
|
lockdep_assert_held(&sinfo->lock); \
|
|
trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \
|
|
trace_btrfs_space_reservation(fs_info, trace_name, \
|
|
sinfo->flags, abs_bytes, \
|
|
bytes > 0); \
|
|
if (bytes < 0 && sinfo->name < -bytes) { \
|
|
WARN_ON(1); \
|
|
sinfo->name = 0; \
|
|
return; \
|
|
} \
|
|
sinfo->name += bytes; \
|
|
}
|
|
|
|
DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
|
|
DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
|
|
|
|
int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
|
|
void btrfs_add_bg_to_space_info(struct btrfs_fs_info *info,
|
|
struct btrfs_block_group *block_group);
|
|
void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info,
|
|
u64 chunk_size);
|
|
struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
|
|
u64 flags);
|
|
u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
|
|
bool may_use_included);
|
|
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
|
|
void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *info, u64 bytes,
|
|
int dump_block_groups);
|
|
int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u64 orig_bytes,
|
|
enum btrfs_reserve_flush_enum flush);
|
|
void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info);
|
|
int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 bytes,
|
|
enum btrfs_reserve_flush_enum flush);
|
|
|
|
static inline void btrfs_space_info_free_bytes_may_use(
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 num_bytes)
|
|
{
|
|
spin_lock(&space_info->lock);
|
|
btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
|
|
btrfs_try_granting_tickets(fs_info, space_info);
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
|
|
enum btrfs_reserve_flush_enum flush);
|
|
void btrfs_dump_space_info_for_trans_abort(struct btrfs_fs_info *fs_info);
|
|
void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
|
|
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
|
|
|
|
#endif /* BTRFS_SPACE_INFO_H */
|