@@ -181,6 +181,56 @@ void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
found->full = 0;
}
+/*
+ * Compute chunk size depending on block type for regular volumes.
+ */
+static u64 compute_chunk_size_regular(struct btrfs_fs_info *info, u64 flags)
+{
+ 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 (info->fs_devices->total_rw_bytes > 50ULL * SZ_1G)
+ return SZ_1G;
+
+ return SZ_256M;
+}
+
+/*
+ * Compute chunk size for zoned volumes.
+ */
+static u64 compute_chunk_size_zoned(struct btrfs_fs_info *info)
+{
+ return info->zone_size;
+}
+
+/*
+ * Compute chunk size depending on volume type.
+ */
+static u64 compute_chunk_size(struct btrfs_fs_info *info, u64 flags)
+{
+ if (btrfs_is_zoned(info))
+ return compute_chunk_size_zoned(info);
+
+ return compute_chunk_size_regular(info, flags);
+}
+
+/*
+ * Update default chunk size.
+ *
+ */
+void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info,
+ u64 flags, u64 chunk_size)
+{
+ spin_lock(&space_info->lock);
+ space_info->default_chunk_size = chunk_size;
+ spin_unlock(&space_info->lock);
+}
+
static int create_space_info(struct btrfs_fs_info *info, u64 flags)
{
@@ -202,6 +252,7 @@ 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;
+ space_info->default_chunk_size = compute_chunk_size(info, flags);
ret = btrfs_sysfs_add_space_info_type(info, space_info);
if (ret)
@@ -23,6 +23,7 @@ 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. */
+ u64 default_chunk_size; /* default chunk size in bytes */
int clamp; /* Used to scale our threshold for preemptive
flushing. The value is >> clamp, so turns
@@ -115,6 +116,8 @@ 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 flags, 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,
@@ -5063,26 +5063,16 @@ 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 = space_info->default_chunk_size;
+ ctl->max_stripe_size = space_info->default_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),
The chunk size is stored in the btrfs_space_info structure. It is initialized at the start and is then used. Two api's are added to get the current value and one to update the value. These api's will be used to be able to expose the chunk_size as a sysfs setting. Signed-off-by: Stefan Roesch <shr@fb.com> --- fs/btrfs/space-info.c | 51 +++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/space-info.h | 3 +++ fs/btrfs/volumes.c | 28 ++++++++---------------- 3 files changed, 63 insertions(+), 19 deletions(-)