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btrfs: store chunk size in space-info struct

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The chunk size is stored in the btrfs_space_info structure.  It is
initialized at the start and is then used.

A new API is added to update the current chunk size.  This API is used
to be able to expose the chunk_size as a sysfs setting.

Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ rename and merge helpers, switch atomic type to u64, style fixes ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Stefan Roesch 2022-02-08 11:31:20 -08:00 committed by David Sterba
parent 71b68e9e35
commit f6fca3917b
3 changed files with 45 additions and 19 deletions
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32
fs/btrfs/space-info.c
View File

@ -187,6 +187,37 @@ void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
*/
#define BTRFS_DEFAULT_ZONED_RECLAIM_THRESH (75)
/*
* Calculate chunk size depending on volume type (regular or zoned).
*/
static u64 calc_chunk_size(const struct btrfs_fs_info *fs_info, u64 flags)
{
if (btrfs_is_zoned(fs_info))
return fs_info->zone_size;
ASSERT(flags & BTRFS_BLOCK_GROUP_TYPE_MASK);
if (flags & BTRFS_BLOCK_GROUP_DATA)
return SZ_1G;
else if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
return SZ_32M;
/* Handle BTRFS_BLOCK_GROUP_METADATA */
if (fs_info->fs_devices->total_rw_bytes > 50ULL * SZ_1G)
return SZ_1G;
return SZ_256M;
}
/*
* Update default chunk size.
*/
void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info,
u64 chunk_size)
{
WRITE_ONCE(space_info->chunk_size, chunk_size);
}
static int create_space_info(struct btrfs_fs_info *info, u64 flags)
{
@ -208,6 +239,7 @@ static int create_space_info(struct btrfs_fs_info *info, u64 flags)
INIT_LIST_HEAD(&space_info->tickets);
INIT_LIST_HEAD(&space_info->priority_tickets);
space_info->clamp = 1;
btrfs_update_space_info_chunk_size(space_info, calc_chunk_size(info, flags));
if (btrfs_is_zoned(info))
space_info->bg_reclaim_threshold = BTRFS_DEFAULT_ZONED_RECLAIM_THRESH;

4
fs/btrfs/space-info.h
View File

@ -25,6 +25,8 @@ struct btrfs_space_info {
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
@ -123,6 +125,8 @@ void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
u64 bytes_readonly, u64 bytes_zone_unusable,
struct btrfs_space_info **space_info);
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,

28
fs/btrfs/volumes.c
View File

@ -5071,26 +5071,16 @@ static void init_alloc_chunk_ctl_policy_regular(
struct btrfs_fs_devices *fs_devices,
struct alloc_chunk_ctl *ctl)
{
u64 type = ctl->type;
struct btrfs_space_info *space_info;
if (type & BTRFS_BLOCK_GROUP_DATA) {
ctl->max_stripe_size = SZ_1G;
ctl->max_chunk_size = BTRFS_MAX_DATA_CHUNK_SIZE;
} else if (type & BTRFS_BLOCK_GROUP_METADATA) {
/* For larger filesystems, use larger metadata chunks */
if (fs_devices->total_rw_bytes > 50ULL * SZ_1G)
ctl->max_stripe_size = SZ_1G;
else
ctl->max_stripe_size = SZ_256M;
ctl->max_chunk_size = ctl->max_stripe_size;
} else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
ctl->max_stripe_size = SZ_32M;
ctl->max_chunk_size = 2 * ctl->max_stripe_size;
ctl->devs_max = min_t(int, ctl->devs_max,
BTRFS_MAX_DEVS_SYS_CHUNK);
} else {
BUG();
}
space_info = btrfs_find_space_info(fs_devices->fs_info, ctl->type);
ASSERT(space_info);
ctl->max_chunk_size = READ_ONCE(space_info->chunk_size);
ctl->max_stripe_size = ctl->max_chunk_size;
if (ctl->type & BTRFS_BLOCK_GROUP_SYSTEM)
ctl->devs_max = min_t(int, ctl->devs_max, BTRFS_MAX_DEVS_SYS_CHUNK);
/* We don't want a chunk larger than 10% of writable space */
ctl->max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),